CN115228273B - Control method of seawater desulfurization system - Google Patents
Control method of seawater desulfurization system Download PDFInfo
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- CN115228273B CN115228273B CN202210971659.6A CN202210971659A CN115228273B CN 115228273 B CN115228273 B CN 115228273B CN 202210971659 A CN202210971659 A CN 202210971659A CN 115228273 B CN115228273 B CN 115228273B
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Abstract
The invention relates to a seawater stripping methodA method of controlling a sulfur system, comprising: SO (sulfur dioxide) of water inlet of seawater desulfurization system is obtained 2 Concentration C1; calculating the HCO of the seawater at the preset time t 3 ‑ Concentration C (t); for seawater HCO 3 ‑ Correcting the concentration C (t) to obtain the effective HCO of the seawater 3 ‑ Concentration C (t 1); acquiring a boiler load X; acquiring SO when each spraying layer group is opened 2 A model of the emission concentration C2 versus C1, C (t 1) and X; SO is put into 2 Concentration C1 and effective HCO 3 ‑ The concentration C (t 1) is respectively substituted into SO when a plurality of spraying layer groups are opened 2 In the relation model of the discharge concentration C2, C1 and C (t 1), SO when each spraying layer group is opened is respectively obtained 2 Is a discharge concentration C2; SO is put into 2 The spray layer group closest to the highest emission standard is the target spray layer group, and the emission concentration C2 of the spray layer group is lower than the highest emission standard; and opening a target spraying layer group. The control method of the invention can ensure SO in the flue gas 2 The concentration reaches the emission requirement, and the seawater desulfurization system which does not increase the power consumption can protect the environment and not excessively consume the power resources.
Description
Technical Field
The invention relates to the technical field of seawater desulfurization systems, in particular to a control method of a seawater desulfurization system.
Background
The seawater desulfurization is a process for removing and absorbing sulfur dioxide in flue gas by using natural seawater as an absorbent. The seawater desulfurization process can save fresh water resources, does not produce waste, has simple equipment structure and low construction and operation cost, and is a desulfurization process commonly adopted by enterprises such as coastal power plants and the like which produce a large amount of sulfur-containing flue gas.
The existing seawater desulfurization system is provided with a spray layer, seawater is sprayed out of the spray layer and combined with sulfur-containing flue gas, sulfur dioxide in the sulfur-containing flue gas is dissolved in the seawater and reacts with oxygen to generate sulfate ions and hydrogen ions, the pH value of the seawater is reduced, and simultaneously, dissolved carbonate ions in the seawater react with the hydrogen ions to produce carbon dioxide and water, so that the pH value change of the seawater is limited and the pH value of the seawater is kept stable. However, part of the plantThe concentration of the water near the water intake is desalted by the fresh water of the canal, the concentration of carbonate ions in the seawater is too low, the emission concentration of the desulfurized flue gas cannot reach the standard, and a plurality of spray layers are required to be opened to meet the requirement of SO 2 The concentration meets the emission requirement, and excessive opening of the spraying layer easily causes the increase of power consumption.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the control method of the seawater desulfurization system in the prior art easily causes SO in the desulfurized flue gas 2 The concentration can not meet the emission requirement or the spray layer is opened excessively to increase the power consumption, thereby providing a method capable of ensuring SO in the flue gas 2 The concentration reaches the emission requirement, and the seawater desulfurization system which does not increase the power consumption can protect the environment and does not excessively consume the power resource.
In order to solve the above problems, the present invention provides a control method of a seawater desulfurization system, wherein the seawater desulfurization system comprises a plurality of spray layer groups, each spray layer group comprising one or more spray layers, wherein the control method comprises: SO (sulfur dioxide) of water inlet of seawater desulfurization system is obtained 2 Concentration C1; calculating the HCO of the seawater at the preset time t 3 - Concentration C (t); for seawater HCO 3 - Correcting the concentration C (t) to obtain the effective HCO of the seawater 3 - Concentration C (t 1); acquiring a boiler load X; acquiring SO when each spraying layer group is opened 2 A model of the emission concentration C2 versus C1, C (t 1) and X; SO at the water inlet of the seawater desulfurization system 2 Concentration C1 and effective HCO 3 - The concentration C (t 1) is respectively substituted into SO when a plurality of spraying layer groups are opened 2 In the relation model of the discharge concentration C2, C1 and C (t 1), SO when each spraying layer group is opened is respectively obtained 2 Is a discharge concentration C2; SO is put into 2 The spray layer group closest to the highest emission standard is the target spray layer group, and the emission concentration C2 of the spray layer group is lower than the highest emission standard; and opening a target spraying layer group.
Further, the sea water HCO at the predetermined time t is calculated 3 - Concentration C (t), specifically comprising:
acquiring runoff data Q of a designated river before a hours, wherein a is the time required for the river from a hydrological station to a water inlet of a seawater desulfurization system, and the designated river is a river communicated with the water inlet of the seawater desulfurization system;
judging whether Q is smaller than 15000;
if the judgment result is that Q is smaller than 15000, HCO is obtained 3 - Measured concentration value C 0 ,C(t)＝C 0 。
Further, the sea water HCO at the predetermined time t is calculated 3 - Concentration C (t), specifically comprising:
acquiring runoff data Q of a designated river before a hours, wherein a is the time required for the river from a hydrological station to a water inlet of a seawater desulfurization system, and the designated river is a river communicated with the water inlet of the seawater desulfurization system;
judging whether Q is smaller than 15000;
if the Q is less than 15000, the method comprises the following steps of HCO 3 - HCO read in concentration data sheet 3 - Concentration as seawater HCO 3 - Concentration C (t).
Further, the sea water HCO at the predetermined time t is calculated 3 - Concentration C (t), further comprising:
if the judgment result is that Q is larger than or equal to 15000, HCO is obtained 3 - Measured concentration value C 0 ；
According to HCO 3 - Measured concentration value C 0 Calculating the HCO of the seawater at the preset time t 3 - The concentration C (t),
C(t)＝2.3[K 1 Tl(t-a)] 5 -(Q/10000-1.5) 3/2 +C 0 +1.5；
wherein Tl (t-a) is the tide level height relative to the average sea level, in m;
q is the daily average diameter flow of the hydrologic station, and the unit is m 3 /s；
K 1 The coefficients are adjusted for tidal range.
Further, the HCO of the seawater at the predetermined time t is calculated 3 - Concentration ofC (t), further comprising:
if the determination result is that Q is larger than or equal to 15000, calculating HCO of the seawater at the preset time t 3 - The concentration C (t),
C(t)＝2.3[K 1 Tl(t-a)] 5 -(Q/10000-1.5) 3/2 +90；
wherein Tl (t-a) is the tide level height relative to the average sea level, in m;
q is the daily average diameter flow of the hydrologic station, and the unit is m 3 /s；
K 1 The coefficients are adjusted for tidal range.
Further, k1=2.82/(Tl) max -TL min )；
Wherein Tlmax is the highest tide level value within the first 1 year of test time t;
tlmin is the lowest tide level value in the first 1 year of test time t, and the base surface is the mean sea level.
Further, the seawater HCO is corrected 3 - The concentration C (t) mainly includes:
judging whether C (t) is less than 48mg/l;
if yes, effective HCO of corrected seawater 3 - Concentration C (t 1) =48 mg/l.
Further, the HCO of the seawater is corrected 3 - The concentration C (t) further includes:
if C (t) is more than or equal to 48mg/l, judging whether C (t) is more than 98.55mg/l;
if C (t) is less than or equal to 98.55mg/l, C (t 1) =c (t);
if C (t) is greater than 98.55mg/l, effective HCO of the corrected seawater 3 - Concentration C (t 1) =98.55 mg/l.
Further, SO when each spraying layer group is opened is obtained respectively 2 The relation model of the discharge concentration C2 and C1, C (t 1) and the boiler load X mainly comprises:
obtaining desulfurization efficiency eta of a spray layer group;
acquiring a first correction factor gamma 1 of the boiler load X to the desulfurization efficiency;
obtaining effective HCO of seawater 3 - A second correction factor γ2 of the concentration C (t 1) to the desulfurization efficiency;
SO when the spraying layer group is opened is calculated according to the desulfurization efficiency of the spraying layer group, the first correction factor gamma 1 and the second correction factor gamma 2 2 The emission concentration C2, c2=c1 (1- γ1γ2η).
Further, obtaining the desulfurization efficiency eta of the spraying layer group specifically comprises the following steps:
obtain desulfurization efficiency eta and SO of the water inlet of the seawater desulfurization system 2 A desulfurization efficiency curve between concentrations C1;
SO at the water inlet of the seawater desulfurization system 2 And the concentration C1 is brought into a desulfurization efficiency curve, and the desulfurization efficiency eta of the spraying layer group is obtained.
Further, obtaining a first correction factor gamma 1 of the boiler load X to the desulfurization efficiency specifically includes:
acquiring a second relation curve between the boiler load X and the first correction factor gamma 1;
and bringing the boiler load X into a second relation curve to obtain a first correction factor gamma 1 of the boiler load X on the desulfurization efficiency.
Further, the effective HCO of the seawater is obtained 3 - The second correction factor γ2 of the concentration C (t 1) to the desulfurization efficiency specifically includes:
obtaining effective HCO of seawater 3 - A third relationship between the concentration C (t 1) and a second correction factor γ2 of the desulfurization efficiency;
effective HCO of seawater 3 - The concentration C (t 1) is carried into a third relation curve to obtain the effective HCO of the seawater 3- A second correction factor gamma 2 of concentration versus desulfurization efficiency.
Further, the seawater desulfurization system comprises a first spraying layer, a second spraying layer, a third spraying layer and a fourth spraying layer, wherein the spraying layer group comprises a first spraying layer group, a second spraying layer group, a third spraying layer group and a fourth spraying layer group, the first spraying layer group comprises a first spraying layer, a second spraying layer, a third spraying layer and a fourth spraying layer, the second spraying layer group comprises a first spraying layer, a second spraying layer and a third spraying layer, the third spraying layer group comprises a first spraying layer group, a second spraying layer group and a fourth spraying layer, and the fourth spraying layer group comprises a first spraying layer and a second spraying layer.
The invention has the following advantages:
according to the technical scheme, the control method of the seawater desulfurization system can be used for controlling the SO of the water inlet of the seawater desulfurization system 2 Effective HCO of concentration C1 and seawater 3 - The concentration C (t 1) and the boiler load X predict SO when each spraying layer group is opened 2 Thereby opening a proper spraying layer group to ensure SO in the flue gas after desulfurization of the seawater desulfurization system 2 The concentration meets the emission requirements without excessive consumption of electrical resources. Therefore, the control method of the seawater desulfurization system can simulate the concentration change of seawater under different working condition combinations, can be used as the input condition of the operation of the desulfurization system, gives out the operation combination strategy of each spray layer of the seawater desulfurization system according to the concentration change, the coal quality difference of a power plant and the load change of a boiler, and can overcome the defect that the control method of the seawater desulfurization system in the prior art easily causes SO in the desulfurized flue gas 2 The concentration can not meet the emission requirement or the defect that the power consumption is increased due to excessive opening of a spraying layer, which can ensure SO in the flue gas 2 The concentration reaches the emission requirement, and the seawater desulfurization system which does not increase the power consumption can protect the environment and does not excessively consume the power resource.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method of a seawater desulfurization system according to an embodiment of the present invention;
FIG. 2 schematically shows a control method and SO of a seawater desulfurization system according to an embodiment of the present invention 2 Concentration C1A relationship curve;
FIG. 3 schematically shows a second relationship between the boiler load X and the first correction factor gamma 1 for a control method of a seawater desulfurization system according to an embodiment of the present invention;
FIG. 4 schematically shows the effective HCO of the control method of the seawater desulfurization system of an embodiment of the present invention 3 - A third relationship between the concentration C (t 1) and the second correction factor γ2.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Fig. 1 is a flowchart of a control method of a seawater desulfurization system according to an embodiment of the present invention. As shown in fig. 1, the present embodiment relates to a control method of a seawater desulfurization system, wherein the seawater desulfurization system includes a plurality of spray layer groups. Each spray pattern assembly includes one or more spray patterns. The control method of the present embodiment mainly includes step S1, step S2, step S3, step S4, step S5, step S6, step S7, and step S8.
Wherein, the step S1 mainly comprises the step of obtaining SO at the water inlet of the seawater desulfurization system 2 Concentration C1.
Wherein SO 2 The concentration of (2) can calculate SO when each coal is burnt according to the coal quality parameters such as the received base moisture content, the received base carbon content, the received base hydrogen content, the received base oxygen content, the received base nitrogen content, the received base total sulfur content, the received base ash content, the low-position heating value and the like 2 The amount of formation is calculated and is well known to those skilled in the art and will not be described in detail here.
Step S2 essentially comprises calculating HCO of the seawater at a predetermined time t 3 - Concentration C (t).
Step S3 mainly comprises HCO for seawater 3 - Correcting the concentration C (t) to obtain the effective HCO of the seawater 3 - Concentration C (t 1);
step S4 mainly comprises the steps of obtaining a boiler load X; the boiler load may be measured by steam flow meter or water tank, etc., as is well known to those skilled in the art and will not be described in detail herein.
Step S5 mainly comprises the steps of respectively obtaining SO when each spraying layer group is opened 2 A model of the emission concentration C2 versus C1, C (t 1) and X;
step S6 mainly comprises SO at the water inlet of the seawater desulfurization system 2 HCO of concentration C1 and seawater 3 - The concentration C (t 1) is respectively substituted into SO when a plurality of spraying layer groups are opened 2 In the model of the relation between the emission concentration C2 and C1 and C (t 1), respectivelyObtaining SO when each spraying layer group is opened 2 Is a discharge concentration C2;
step S7 mainly comprises the steps of reacting SO 2 The spray layer group closest to the highest emission standard is the target spray layer group, and the emission concentration C2 of the spray layer group is lower than the highest emission standard; in the present embodiment, the highest emission standard is 150, but not limited thereto, and the operator may adjust the target emission concentration according to the actual demand.
Step S8 mainly comprises the step of starting a target spraying layer group.
As can be seen from the above technical solutions, the control method of the seawater desulfurization system according to the present embodiment can be based on the SO of the water inlet of the seawater desulfurization system 2 Effective HCO of concentration C1 and seawater 3 - SO when a plurality of spraying layer groups are started is predicted by the concentration C (t 1) and the boiler load X 2 Thereby opening a proper spraying layer group to ensure SO in the flue gas after desulfurization of the seawater desulfurization system 2 The concentration meets the emission requirements without excessive consumption of electrical resources. Therefore, the control method of the seawater desulfurization system of the embodiment can simulate the HCO of the seawater in different working condition combinations 3 - The concentration change is used as an input condition for the operation of the seawater desulfurization system, and the operation combination strategy of each spraying layer of the seawater desulfurization system is provided according to the concentration change, the different coal quality of the power plant and the load change, SO that the problem that SO in the desulfurized flue gas is easily caused by the control method of the seawater desulfurization system in the prior art can be overcome 2 The concentration can not meet the emission requirement or the defect that the power consumption is increased due to excessive opening of a spraying layer, which can ensure SO in the flue gas 2 The concentration reaches the emission requirement, and the seawater desulfurization system which does not increase the power consumption can protect the environment and does not excessively consume the power resource.
For example, in the present embodiment, the control method of the seawater desulfurization system is used in a coal-fired power plant in which the concentration of fresh water in the water near the intake of the power plant is desalinated by canal fresh water, and HCO of the seawater quality 3 - The concentration varies between 48mg/L and 96 mg/L. Whereas seawater adopted by a seawater desulfurization system of a general coastal coal-fired power plant has HCO (hydrogen chloride) 3 - The ion concentrations are allBetween 100 and 190 mg/L. On the other hand, the SO of the power plant seawater desulfurization system 2 Design concentration of 1912mg/Nm 3 While the coal quality potentially adopted by the power plant is only one higher than the designed concentration, most of the coal quality is lower than the designed concentration, so that the spraying layer overflows in the operation process of the seawater desulfurization system.
Due to HCO 3 - The concentration measurement process of (2) is long in time consumption, and the prior art can not obtain real-time HCO through measurement 3 - Concentration, also HCO in terms of seawater 3 - The concentration of the spray layer group is difficult to adjust, and the embodiment provides HCO based on a water quality diffusion model 3 - The concentration prediction method specifically includes step S201, step S202, and step S203.
Step S201: acquiring runoff data Q of a designated river before a hours, wherein the unit is m 3 And/s. Wherein a is the time required for a river from a hydrologic station to a water inlet of a seawater desulfurization system, and the river is designated as the river connected with a water intake of the seawater desulfurization system. Those skilled in the art can calculate the specific value of a based on the flow rate of river water and the relative position of the hydrologic station and the power plant intake, for example, in this embodiment, the time for the river to flow from the hydrologic station to the power plant intake is about two hours, so that a is 2. Wherein, hydrologic station refers to the hydrologic station of power plant local.
Step S202: judging whether Q is smaller than 15000;
step S203: if the judgment result is that Q is smaller than 15000, HCO is obtained 3 - Measured concentration value C 0 ,C(t)＝C 0 。
The operator can choose to measure HCO once a day 3 - Concentration as HCO 3 - Measured concentration value C 0 . The applicant found that when the runoff data Q of the river is less than 15000m 3 At the time of/s, the river is injected into the water intake of the power plant and does not lead to HCO of seawater 3 - The concentration C (t) has a remarkable effect, so that when Q is judged to be less than 15000, HCO measured daily can be obtained 3 - Concentration as HCO 3 - Measured concentration value C 0 . It should be noted thatHCO near the intake port at low tide 3 - The concentration is reduced by the influence of fresh water leakage, so that the HCO is ensured to be obtained 3 - Measured concentration value C 0 Representative, HCO measurement 3 - Measured concentration value C 0 The sampling time of (2) is required to avoid the period of 2 hours before and after the lowest tide level. HCO to be measured 3 - Concentration substitution mathematical model can predict real-time HCO 3 - Concentration.
Therefore, the control method of the seawater desulfurization system of the present embodiment can combine real-time river flow information, law of change of tide level, and historical HCO 3 - Concentration to predict real-time seawater HCO 3 - Concentration C (t), solves the problem that the prior art can not obtain real-time HCO 3 - The concentration makes it difficult to formulate a proper spray layer operation strategy. The embodiment flow information can be obtained from a local hydrologic station, and the tide level change rule is simulated by using a hydrodynamic model and a terrain model to obtain a tide level data table of nearly 30 years.
Preferably, when HCO cannot be measured or has not been measured in advance 3 - Measured concentration value C 0 In the meantime, from HCO 3 - HCO read in concentration data sheet 3 - Concentration as HCO 3 - Concentration C (t). Wherein HCO 3 - The concentration data table is statistical data of years and contains average HCO of each month 3 - Concentration, average HCO of month corresponding to predetermined time t can be obtained during reading 3 - HCO at a concentration deemed to be a predetermined time t 3 - Concentration C (t).
In the present embodiment, the HCO of the seawater at the predetermined time t is calculated 3 - The concentration C (t) further includes:
if the judgment result is that Q is larger than or equal to 15000, HCO is obtained 3 - Measured concentration value C 0 ；
According to HCO 3 - Measured concentration value C 0 Calculating HCO of seawater at predetermined time t 3 - Concentration C (t), C (t) =2.3 [ [K 1 Tl(t-a)] 5 -(Q/10000-1.5) 3/2 +C 0 +1.5；
Wherein Tl (t-a) is the tide level height relative to the average sea level, in m;
q is the daily average diameter flow of the hydrologic station, and the unit is m 3 /s；
K1 is a tidal range adjustment coefficient;
preferably k1=2.82/(Tl) max -TL min )；
Wherein Tlmax is the highest tide level value within the first 1 year of test time t;
tlmin is the lowest tide level value in the first 1 year of test time t, and the base surface is the mean sea level.
Preferably, in the present embodiment, if the determination result is that Q is 15000 or more, HCO is not measured in advance 3 - Measured concentration value C 0 At that time, the HCO of the seawater at the predetermined time t is calculated 3 - The step of concentration C (t) includes,
C(t)＝2.3[K 1 Tl(t-a)]5-(Q/10000-1.5) 3/2 +90；
wherein Tl (t-a) is the tide level height relative to the average sea level, in m;
q is the daily average diameter flow of the hydrologic station, and the unit is m 3 /s；
K 1 Adjusting the coefficient for the tidal range;
K 1 ＝2.82/(Tl max -TL min )。
wherein Tlmax is the highest tide level value within the first 1 year of test time t;
tlmin is the lowest tide level value in the first 1 year of test time t, and the base surface is the mean sea level.
In the present embodiment, HCO of sea water is corrected 3 - The concentration C (t) mainly includes:
judging whether C (t) is less than 48mg/l;
if so, obtaining HCO of the corrected seawater 3 - Concentration C (t 1) =48 mg/l.
In the present embodiment, step S3 preferably further includes step S301, step S302, and step S303.
Step S301 includes: if C (t) is more than or equal to 48mg/l, judging whether C (t) is more than 98.55mg/l;
step S302 includes: if the C (t) is 98.55mg/l or less, C (t 1) =c (t); when C (t) is less than or equal to 98.55mg/l and more than or equal to 48mg/l, HCO of seawater 3 - The concentration C (t) is within a reasonable range and is therefore not corrected.
Step S303 includes: if C (t) is more than 98.55mg/l, obtaining HCO of corrected seawater 3 - Concentration C (t 1) =98.55 mg/l.
In the present embodiment, step S5 mainly includes step S501, step S502, and step S503:
step S501 mainly includes obtaining desulfurization efficiency η of the spray layer group.
Step S502 mainly includes obtaining a first correction factor γ1 of the boiler load X with respect to the desulfurization efficiency.
Obtaining effective HCO of seawater 3 - A second correction factor γ2 of the concentration C (t 1) to the desulfurization efficiency;
step S503 mainly includes calculating SO2 emission concentration C2, c2=c1 (1- γ1γ2η) when the spray layer group is opened according to the desulfurization efficiency of the spray layer, the first correction factor γ1 and the second correction factor γ2.
For example, in this embodiment, the seawater desulfurization system includes a first spray layer, a second spray layer, a third spray layer, and a fourth spray layer, the spray layer group includes a first spray layer group, a second spray layer group, a third spray layer group, and a fourth spray layer group, the first spray layer group includes a first spray layer, a second spray layer, a third spray layer, and a fourth spray layer, the second spray layer group includes a first spray layer, a second spray layer, and a third spray layer, the third spray layer group includes a first spray layer group, a second spray layer, and a fourth spray layer, and the fourth spray layer group includes a first spray layer, and a second spray layer.
Step S501 mainly includes obtaining the desulfurization efficiency η1 of the first spray layer group, and step S501 mainly includes obtaining the desulfurization efficiency η2 of the second spray layer group, the desulfurization efficiency η3 of the third spray layer group, and the desulfurization efficiency η4 of the fourth spray layer group, respectively.
In this embodiment, the desulfurization efficiency η of the spray layer group is obtained, and the step S501 specifically includes a step S5011 and a step S5012.
Step S5011: obtain desulfurization efficiency eta and SO of the water inlet of the seawater desulfurization system 2 A desulfurization efficiency curve between concentrations C1;
step S5012: SO at the water inlet of the seawater desulfurization system 2 And the concentration C1 is brought into a desulfurization efficiency curve, and the desulfurization efficiency eta of the spraying layer group is obtained.
Specifically, in this embodiment, as shown in fig. 2, according to a desulfurization efficiency curve, calculation formulas of desulfurization efficiencies η1, η2, η3 and η4 of the first spraying layer group, the second spraying layer group, the third spraying layer group and the fourth spraying layer group are respectively obtained by point fitting, where the calculation formulas are respectively: .
η 1 ＝100.46395-0.01227C 1 +6.3596×10 -6 C 1 2 -1.1562×10 -9 C 1 3 ；
η 2 ＝95.57066-0.00903C 1 +5.50235×10 -6 C 1 2 -1.35957×10 -9 C 1 ；
η 3 ＝88.65585+0.00479C 1 -6.99504×10 -6 C 1 2 +1.72295×10 -9 C 1 3 ；
η 4 ＝93.28317-0.00966C 1 +9.14597×10 -7 C 1 2 。
The desulfurization efficiency curve is obtained by carrying out simulation tests on the seawater desulfurization system under different working conditions, counting test results and then carrying out numerical analysis. In the present embodiment, step S6 specifically includes step S601 and step S602, wherein,
step S601 includes obtaining a second relationship curve between the boiler load X and the first correction factor γ1;
step S602 includes bringing the boiler load X into a second relationship, obtaining a first correction factor γ1 of the boiler load X for the desulfurization efficiency.
Specifically, in this embodiment, as shown in fig. 3, the flue gas load X of the water inlet is obtained, the corresponding first correction factor γ1 is found according to the second relationship curve between the correction factor of the desulfurization efficiency and the boiler load, and the calculation formula of the influence factor of the flue gas load on the desulfurization efficiency is obtained by fitting by taking points, where X is the boiler load. The second relation curve is obtained by carrying out simulation test on the seawater desulfurization system under different working conditions, counting test results and then carrying out numerical analysis.
γ 1 ＝1.022-0.022X。
In the present embodiment, step S7 specifically includes step S701 and step S702.
The step S701 mainly includes: obtaining effective HCO of seawater 3 - A third relationship between the concentration C (t 1) and a second correction factor gamma 2 of the desulfurization efficiency;
the step S702 mainly includes: effective HCO of seawater 3 - The concentration C (t 1) is carried into a third relation curve to obtain the effective HCO of the seawater 3 - And a second correction factor gamma 2 of the concentration C (t 1) to the desulfurization efficiency.
Specifically, in the present embodiment, as shown in fig. 4, HCO is obtained by taking a point fit 3 - Second correction factor gamma 2 of concentration versus desulfurization efficiency, HCO 3 - Specific relation to concentration:
γ 2 ＝2.41658-0.10863P+0.00247P 2 -2.23984×10 -4 P 3 +7.14082×10 -8 P 4
wherein P is C (t 1). The third relation curve is obtained by carrying out simulation test on the seawater desulfurization system under different working conditions, counting test results and then carrying out numerical analysis.
In summary, the control method of the seawater desulfurization system of the embodiment can be based on the SO of the water inlet of the seawater desulfurization system 2 Effective HCO of concentration C1 and seawater 3 - SO when a plurality of spraying layer groups are started is predicted by the concentration C (t 1) and the boiler load X 2 Thereby opening a proper spraying layer group to ensure SO in the flue gas after desulfurization of the seawater desulfurization system 2 The concentration meets the emission requirements without excessive consumption of electrical resources. Therefore, the control method of the seawater desulfurization system can simulate the concentration change of seawater under different working condition combinations, can be used as the input condition of the operation of the desulfurization system, gives out the operation combination strategy of each spray layer of the seawater desulfurization system according to the concentration change, the coal quality difference and the load change of a power plant, and can overcome the defect that the control method of the seawater desulfurization system in the prior art easily causes SO in the desulfurized flue gas 2 The concentration can not meet the emission requirement or the defect that the power consumption is increased due to excessive opening of a spraying layer, which can ensure SO in the flue gas 2 The concentration reaches the emission requirement, and the seawater desulfurization system which does not increase the power consumption can protect the environment and does not excessively consume the power resource.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (11)
1. A method of controlling a seawater desulfurization system, the seawater desulfurization system comprising a plurality of spray groups of layers, each spray group of layers comprising one or more spray layers, the method comprising:
SO (sulfur dioxide) of water inlet of seawater desulfurization system is obtained 2 Concentration C1;
calculating the HCO of the seawater at the preset time t 3 - Concentration C (t);
for the seawater HCO 3 - Correcting the concentration C (t) to obtain the effective HCO of the seawater 3 - Concentration C (t 1);
acquiring a boiler load X;
acquiring SO when each spraying layer group is opened 2 A model of the emission concentration C2 of C1, C (t 1) and X;
desulfurizing the seawaterSO at system water inlet 2 Concentration C1 and said effective HCO 3 - The concentration C (t 1) is respectively substituted into SO when a plurality of spraying layer groups are opened 2 In the relation model of the discharge concentration C2, C1 and C (t 1), SO when each spraying layer group is opened is respectively obtained 2 Is a discharge concentration C2;
SO is put into 2 The spray layer group closest to the highest emission standard is the target spray layer group, and the emission concentration C2 of the spray layer group is lower than the highest emission standard;
starting the target spraying layer group;
said calculating the HCO of the sea water at a predetermined time t 3 - Concentration C (t), specifically comprising:
acquiring runoff data Q of a designated river before a hours, wherein a is the time required by the river from a hydrologic station to a water inlet of the seawater desulfurization system, and the designated river is a river communicated with the water inlet of the seawater desulfurization system;
judging whether the Q is smaller than 15000;
if the judgment result is that Q is smaller than 15000, HCO is obtained 3 - Measured concentration value C 0 ,C(t)＝C 0 ；
The runoff data Q is the daily uniform runoff of the hydrologic station, and the unit is m 3 S; or alternatively, the first and second heat exchangers may be,
said calculating the HCO of the sea water at a predetermined time t 3 - Concentration C (t), specifically comprising:
acquiring runoff data Q of a designated river before a hours, wherein a is the time required by the river from a hydrologic station to a water inlet of the seawater desulfurization system, and the designated river is a river communicated with the water inlet of the seawater desulfurization system;
judging whether the Q is smaller than 15000;
if the Q is less than 15000, the method comprises the following steps of HCO 3 - HCO read in concentration data sheet 3 - Concentration as seawater HCO 3 - Concentration C (t);
the runoff data Q is the daily uniform runoff of the hydrologic station, and the unit is m 3 /s
The HCO 3 - The concentration data table is statistical data of years and contains average HCO of each month 3 - Concentration.
2. The control method of a seawater desulfurization system according to claim 1, wherein the seawater HCO at a predetermined time t is calculated 3 - Concentration C (t), further comprising:
if the judgment result is that Q is larger than or equal to 15000, HCO is obtained 3 - Measured concentration value C 0 ；
According to HCO 3 - Measured concentration value C 0 Calculating the HCO of the seawater at the preset time t 3 - The concentration C (t),
C(t)＝2.3[K 1 Tl(t-a)] 5 -(Q/10000-1.5) 3/2 +C 0 +1.5；
wherein Tl (t-a) is the tide level height relative to the average sea level, in m;
q is the daily average diameter flow of the hydrologic station, and the unit is m 3 /s；
K 1 Adjusting the coefficient for the tidal range;
the unit of C (t) is mg/l.
3. The control method of a seawater desulfurization system as recited in claim 1, wherein the: calculating HCO of seawater at predetermined time t 3 - Concentration C (t), further comprising:
if the judgment result is that Q is larger than or equal to 15000, calculating HCO of the seawater at the preset time t 3 - The concentration C (t),
C(t)＝2.3[K 1 Tl(t-a)] 5 -(Q/10000-1.5) 3/2 +90；
wherein Tl (t-a) is the tide level height relative to the average sea level, in m;
q is the daily average diameter flow of the hydrologic station, and the unit is m 3 /s；
K 1 Adjusting the coefficient for the tidal range;
the unit of C (t) is mg/l.
4. The method for controlling a desulfurization system for sea water according to claim 2, wherein,
the K is 1 ＝2.82/(Tl max -TL min )；
Wherein, tlmax is the highest tide level value within the first 1 year of test time t;
the Tlmin is the lowest tide level value in the first 1 year of the test time t, and the basal plane is the average sea level.
5. The method for controlling a seawater desulfurization system as recited in claim 4, wherein the correcting the seawater HCO 3 - The concentration C (t) mainly includes:
judging whether the C (t) is less than 48mg/l;
if so, the corrected effective HCO of the seawater 3 - Concentration C (t 1) =48 mg/l.
6. The method for controlling a desulfurization system for sea water according to claim 4, wherein said correcting HCO of said sea water 3 - The concentration C (t) further includes:
if the C (t) is more than or equal to 48mg/l, judging whether the C (t) is more than 98.55mg/l;
if the C (t) is less than or equal to 98.55mg/l, C (t 1) =c (t);
if the C (t) is more than 98.55mg/l, the corrected effective HCO of the seawater 3 - Concentration C (t 1) =98.55 mg/l.
7. The method for controlling a desulfurization system for sea water according to claim 1, wherein the step of obtaining SO when each of the spray groups is opened is performed separately 2 The relation model of the discharge concentration C2 and C1, C (t 1) and the boiler load X mainly comprises:
obtaining desulfurization efficiency eta of the spray layer group;
acquiring a first correction factor gamma 1 of the boiler load X to the desulfurization efficiency;
obtaining seawater effectivelyHCO 3 - A second correction factor γ2 of the concentration C (t 1) to the desulfurization efficiency;
calculating SO when the spraying layer group is opened according to the desulfurization efficiency of the spraying layer group, the first correction factor gamma 1 and the second correction factor gamma 2 2 The emission concentration C2, c2=c1 (1- γ1γ2η).
8. The method for controlling a seawater desulfurization system as claimed in claim 7, wherein said obtaining the desulfurization efficiency η of the spray layer group comprises:
obtain desulfurization efficiency eta and SO of the water inlet of the seawater desulfurization system 2 A desulfurization efficiency curve between concentrations C1;
SO at the water inlet of the seawater desulfurization system 2 And the concentration C1 is brought into a desulfurization efficiency curve, and the desulfurization efficiency eta of the spraying layer group is obtained.
9. The method for controlling a desulfurization system for sea water according to claim 7, wherein the obtaining the first correction factor γ1 of the boiler load X to the desulfurization efficiency specifically comprises:
acquiring a second relation curve between the boiler load X and a first correction factor gamma 1;
and bringing the boiler load X into a second relation curve to obtain a first correction factor gamma 1 of the boiler load X on the desulfurization efficiency.
10. The method for controlling a desulfurization system for sea water according to claim 7, wherein said effective HCO of sea water is obtained 3 - The second correction factor γ2 of the concentration C (t 1) to the desulfurization efficiency specifically includes:
obtaining the effective HCO of the obtained seawater 3 - A third relationship between the concentration C (t 1) and a second correction factor γ2 of the desulfurization efficiency;
effective HCO of the seawater 3 - The concentration C (t 1) is carried into a third relation curve to obtain the effective HCO of the seawater 3 - A second correction factor gamma 2 of concentration versus desulfurization efficiency.
11. The method of controlling a seawater desulfurization system of claim 1, wherein the seawater desulfurization system comprises a first spray deck, a second spray deck, a third spray deck, and a fourth spray deck, the spray deck comprises a first spray deck, a second spray deck, a third spray deck, and a fourth spray deck, the first spray deck comprises a first spray deck, a second spray deck, a third spray deck, and a fourth spray deck, the second spray deck comprises a first spray deck, a second spray deck, and a third spray deck, the third spray deck comprises a first spray deck, a second spray deck, and a fourth spray deck, and the fourth spray deck comprises a first spray deck and a second spray deck.
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