CN101832546B - Integrated split stream water coil air heater and economizer (IWE) - Google Patents
Integrated split stream water coil air heater and economizer (IWE) Download PDFInfo
- Publication number
- CN101832546B CN101832546B CN201010176763.3A CN201010176763A CN101832546B CN 101832546 B CN101832546 B CN 101832546B CN 201010176763 A CN201010176763 A CN 201010176763A CN 101832546 B CN101832546 B CN 101832546B
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- Prior art keywords
- current
- economizer
- heat exchange
- air heater
- water coil
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000011064 split stream procedure Methods 0.000 title 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003546 flue gas Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 239000000779 smoke Substances 0.000 description 4
- ZAKOWWREFLAJOT-CEFNRUSXSA-N D-alpha-tocopherylacetate Chemical compound CC(=O)OC1=C(C)C(C)=C2O[C@@](CCC[C@H](C)CCC[C@H](C)CCCC(C)C)(C)CCC2=C1C ZAKOWWREFLAJOT-CEFNRUSXSA-N 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
An integrated water coil air heater and economizer arrangement for a boiler has a feedwater inlet for supplying feedwater to the boiler, and conduits and a valve for splitting the feedwater from the inlet into a first partial lower temperature, lower mass flow stream, and a second partial higher temperature, higher flow stream. A water coil air heater for passage of air to be heated for the boiler contains at least one heat transfer loop in heat transfer relationship with the air, the heat transfer loop of the water coil air heater being connected to receive the first partial stream. An economizer for passage of flue gas to be cooled for the boiler contains at least one heat transfer loop in heat transfer relationship with the flue gas, the heat transfer loop of the economizer being connected to the heat transfer loop of the water coil air heater for receiving the first partial stream from the water coil air heater. A mixing location downstream of the economizer receives and reunites the first and second partial streams and a conduit carries the second partial stream from the feedwater inlet to the to the mixing location.
Description
The cross reference of related application
It is No.61/158 that the application requires United States serial, 774, title is " IWE ", the applying date is the priority of the provisional application on March 10th, 2009, the disclosed content of the document this by reference with the content of complete elaboration herein as a reference.
Technical field
Present invention relates in general to boiler and steam generator field, especially, relate to the air heater for heating flame air.
Background technology
Tubulose air heater is main air heat mechanism, has water coil air heater (WCAH) as the alternative generally using.Tubulose air heater or WCAH are used to combustion air to be heated to specific operating temperature now.In the time using WCAH as thermal source, whole current of boiler feedwater are used as heat-exchange medium.Along with air is heated, the temperature of feedwater reduces.Be sent to economizer so leave the feedwater of WCAH, it is used to reduce the temperature of boiler smoke there.Under specific circumstances, tubulose air heater (TAH) is combined a lower final delivery temperature of use acquisition with WCAH.Along with the reduction of flue gas temperature, the size of TAH and WCAH increases.The size of air heater can significantly increase below along with gas temperature is reduced to 325 ℉.Prior art is subject to the restriction of feed temperature, flue gas temperature and required combustion air temperature.
Authorize the people's such as little Clayton United States Patent (USP) 3; 818; 872 have disclosed a kind of device, and this device arranges bypass by some in the introducing feedwater current for around the economizer of this device, and protection has the hearth wall of the once through steam generator of flow cycle again in underload situation.
The United States Patent (USP) 4,160,009 of authorizing Hamabe has disclosed a kind of boiler plant that comprises denitrator, and this denitrator uses catalyst, and is positioned in the optimal reaction temperature region for the catalyst of denitrator.In order to control the temperature of the burning gases in this optimal reaction temperature region, this region is adapted to be connected with high temperature source of the gas or low temperature source of the gas by control valve.
Authorize the people's such as Wiechard United States Patent (USP) 5,555,849 have disclosed a kind of gas control system of the catalytic reduction for nitrogen oxidation emission, during low-load operation, reach the needed temperature of NOx catalytic reduction in order to maintain the temperature of flue gas, make these feedwater bypass cross the economizer of system by segment fluid flow being supplied to bypass line, arrive catalytic reactor with the flue-gas temperature that maintains an expectation.
Authorize the people's such as Albrecht publication application US 2007/0261646 and US 2007/0261647 (content wherein disclosing this by reference with the content of complete elaboration herein as a reference) disclosed a kind of economizer of multi-path and for the temperature controlled method of SCR, wherein maintain the economizer exit gas temperature of expectation, across comprising multiple boiler load scopes with the surperficial tubular structure contacting with flue gas.Each tubular structure can comprise multiple reciprocally levels or be arranged vertically coiled pipe or the wire pipe in economizer, and each tubular structure has an independently feed-water intake.
Prior art be typically the flue place of steam generator system or near flue gas is provided, more than being preferably in 300 ℉.If it will be useful that disclosed system can reduce the discharge temperature of this flue gas economically.
Summary of the invention
An object of the present invention is to obtain a lower boiler final outlet gas temperature more economic as far as possible than prior art.The present invention has improved the driving force between feedwater and flue gas.This driving force having improved is improved the heat transfer between water and flue gas, causes the heat exchange area required compared with using prior device less.
In order to improve the driving force in economizer, be raised on the accessible numerical value of prior art in the logarithmic mean temperature difference (LMTD) between water and flue gas (LMTD).Use prior art, under certain condition, LMTD can not bring up to is enough to allow heat exchange to occur.The present invention passes through the only LMTD of a part of the current of economizer by raising, simultaneous minimization is to maintain heat exchange that current occur by economizer to address this problem.
According to the present invention, integrated water coil pipe air heater (WCAH) and economizer (after this together referred or be called IWE) provide multiple current approach in WCAH and economizer.Whole the flowing of feedwater enters IWE as independent current or multiple current.Be no matter the outside of WCAH or once in the inside of the WCAH of IWE part, feedwater current are divided into two strands or multi-strand flow (shunting WCAH) more.Based on the operating condition of expecting, there is deviation in the current between shunting.
The various novel features of performance characteristic of the present invention are pointed by the characteristic of claim subsequently, and form a part of this disclosure.For a better understanding of the present invention, service advantages and detailed beneficial effect are used and are obtained by it, with reference to accompanying drawing and the text description of the explanation preferred embodiment of the present invention subsequently.
Brief description of the drawings
In the accompanying drawings:
Fig. 1 is the schematic diagram of an embodiment of IWE of the present invention;
Fig. 2 is the schematic diagram of another embodiment of IWE of the present invention;
Fig. 3 is the block diagram of another embodiment of the IWE with multiple independently economizer economizer banks (bank) of the present invention;
Fig. 4 is the schematic diagram of another embodiment of IWE of the present invention;
Fig. 5 is the schematic diagram that comprises with reference to the accompanying drawings the boiler furnace part of 1 IWE of the present invention;
Fig. 6 is similar to Fig. 5 but the schematic diagram of the boiler furnace part of IWE that comprise another embodiment of the present invention;
Fig. 7 is similar to Fig. 5 but the schematic diagram of the boiler furnace part of IWE that comprise another embodiment of the present invention.
Detailed description of the invention
With reference now to accompanying drawing,, in these accompanying drawings, same reference numerals is used to indicate identical or intimate element.Fig. 1 shows a kind of integrated water coil pipe air heater or WCAH 12 and economizer or ECON 14, and they form IWE 10 of the present invention together.This IWE also can use with publication application US2007/0261646 together with the such multichannel economizer 16 disclosing in US2007/0261647, and it can accept the saliva that goes out from the economizer 14 of IWE 10.
the description of device
Total feedwater input entrance 20 by part flow arrangement (for example pipeline and one or more valve) be divided into Part I high temperature, compared with the current of low mass rate 22, and the current 24 of Part II higher temperature, better quality flow.The current 22 of Part I pass through at least one heat exchange loop of WCAH 12, the major part of the heat exchange surface that this heat exchange loop comprises WCAH 12, and be used to improve the LMTD between water and economizer gas.This object realizes by the air of WCAH 12 by the part heating that only makes total water current.This water temperature that causes entering economizer 14 is very low.The current 24 of Part II are along Flows and have minimized heat exchange surface, and are used to mobile most water.For simplified structure, current 22 and 24 are all by economizer 14, so that two strands of current all have certain heat exchange effect, thereby to allow current deviation better to control, and thermal shock in the time that current converge is again minimized.The flow of per share current is determined by the node that valve 26 is set.
Water in per share current maintains shunting in whole WCAH part 12, and current with two parts independently current (shunting current) enter economizer part 14.Current are with the current 22 of a lower temperature, lower mass flow, and the current 24 of higher temperature, high flow capacity enter the economizer part of IWE 10.Current remain shunting in whole economizer part 14 (shunting economizer).The current 22 of low flow low temperature amount are used as the main media with flue gas heat exchange.These current 22 flow through the major part of the heat exchange surface of WCAH 12 and ECON 14.The current 24 of high temperature, high flow capacity have the heat exchange with flue gas with minimizing of minimized heat exchange surface.
Once two strands of current 22 and 24 completely through or major part passed through economizer part 14, they are just in mixing portion 28 combinations of IWE 10, no matter this part is inner or outside, is still at least near the downstream of economizer 14.Then this strand leaves IWE in conjunction with current, then no matter be at 30 places or send into the steamdrum (not shown) of boiler from the outlet 36 of economizer, by economizer or a multichannel economizer 16 without shunting current, with the work of further conducting heat.
As surround as shown in the upstream extremity of current 22 and 24 and the chain-dotted line 32 of valve 26, the shunting of feedwater can occur in water coil air heater outer cover inside or WCAH 12 inside.
As shown in Figure 2, wherein, the shunting of current 22 and 24, valve 26 and mixing portion 28 can be all in the upstreams of WCAH 12 for another embodiment of IWE, or, as shown in chain-dotted line 34, in the upstream of WCAH 12 and the inside of economizer 14.
Fig. 4 illustrates another embodiment of IWE, wherein, lower temperature, compared with the current of low mass rate 22 first by the heat exchange loop 22a in WCAH 12, it is provided to upper reaches by combustion air, and is cooled thus.Then current 22 enter the second heat exchange loop 22b in economizer 14, the flue gas being passed through downwards in economizer, then return and enter the heating of the 3rd in WCAH 12 loop 22c, release heat is to air and reach the temperature of about air, and then once enter Fourth Ring road 22d, with the current 24 of higher temperature, high flow mixing portion 28 in conjunction with before again by flue gas.
The shunting 22 and 24 that feedwater 20 upstream is divided into, and valve 26 is presented at the outside of WCAH 12 in Fig. 4, but they also can alternatively be arranged on WCAH 12 inside.
Fig. 3 is the block diagram of another embodiment of the present invention, and it comprises exemplary flow rate and temperature, and how the catalytic reduction unit or the SCR 40 that illustrate selectable nitrogen oxide are incorporated into the present invention.The economizer 14 of IWE of the present invention, can be 4 pipe economizers, be positioned at SCR 40 downstream and accept come from the lower temperature of WCAH 12, compared with the current 22e of low mass rate.Alternately, come from the lower temperature of WCAH 12, compared with being partly or entirely fed into the 23 pipe economizer 42 in the current 22f of low mass rate, it is also received in mixing portion 28 places and converges later all high temperature, the feedwater current 24 of high flow rate with the current 22e that leaves economizer 14 again.Valve 26,46 and 48 be arranged at control current 22 and 24 and they be assigned to the flow of economizer 14 and 42.Some feedwater also can be divided at 50 places an attemperator (not shown).Then, before 36 places enter steamdrum, so be fed into the 1 pipe economizer 44 that is arranged on SCR upstream from the feedwater current that again converge of economizer 42.
Fig. 3 has also shown that countercurrent flue gas stream is introduced into economizer 44 with 650 ℉, then by SCR 40 and enter economizer 42, then with 889,300lb/hr and 494 ℉ enter the economizer 14 of IWE, finally, reach the flue-gas temperature of acceptable 300 ℉, and discharge whole smoke gas flows.Combustion air enters WCAH 12 heated with 617,315lb/hr and 81 ℉, then leaves with the temperature of 418 ℉.Just as above-mentioned, the temperature of feedwater current and flow rate are as shown in Figure 3.
Fig. 5,6 and 7 has shown the embodiment of IWE of the present invention in boiler furnace part, has also shown the exemplary case of operation of the present invention.
In Fig. 5, accept the feedwater current 22 and 24 of being shunted by valve 26 from feed-water intake 20 with the IWE 10 of WCAH 12 and ECON 14, feedwater current were again converged and were mixed at 28 places before being fed into the second economizer 52, at the second economizer 52 places, taken away by water from the additional heat of smoke inlet 64 at the burner hearth part top that is positioned at 650 ℉.Then the feedwater flow, converging was supplied to the 3rd economizer 54 and the 4th economizer 56 be discharged and turn back to 545 ℉ the other parts of boiler at 36 places before successively.
The flue gas that is cooled to now 300 ℉ is provided for outlet 66 places of burner hearth flue (not shown).
Meanwhile, combustion air is supplied to WCAH 12 with 81 ℉ by air blast 60, here, combustion air as auxiliary air before 62 places are supplied to, be heated to 418 ℉ by the supply of entrance 20 places, 464 ℉ feedwater.
The installation drawing similar to Fig. 5 is shown in Fig. 6, but, feedwater 20 is shunted so that a part of current 22 pass through WCAH 12, the current that discharge from WCAH 12 are fed into economizer 14, here again converge with another part feedwater current 24 from valve 26, thereby all feedwater are all passed the flue gas of economizer 14.
In the embodiment of Fig. 7, except only having one current 22 of feedwater by economizer 14, and another strand of current 24 are shunted at total feed-water intake 20 places, beyond the 28 outside places of economizer 14 and current 22 converge again, and shown in Fig. 6 are similar.In this method, only a part (namely current 22) for feedwater is cooled in WCAH 12.
further describing of process
feedwater flow path:
1. feedwater (20) enters boiler border with whole flows and temperature.
2. feedwater enters IWE in the part that departs from of the shunting current of WCAH (12), is split into two strands of current (22,24) here.Two strands of current keep independently by IWE (10).
3. first strand of current (22) are by way of the major part of WCAH pipe (area of heating surface).
4. second strand of current (24) are admitted to through one and have the single current that minimize the area of heating surface.
5. the major part of heat exchange occurs in first strand of current, and this reduces the water temperature in these current.In the time of second burst of current process WCAH part, minimize heat exchange and occur in second strand of current.
6. two strands of current all leave WCAH part and enter shunting current economizer part.
7. first strand of current is by the major part of economizer tube (area of heating surface).This strand of current play a major role for refrigerating gas.
8. second strand of current is by having the single bassoon that minimizes heat exchange surface.
At two strands of current after the economizer part of IWE, they enter mixing portion (28).
10. in this mixing portion, two strands of current are mixed to together and leave IWE (10).
11. leave after IWE at water, and it is sent to drum or other economizer part as independent mobile current.
smoke gas flow path:
1. flue gas leaves boiler, and passes through other heat exchange surface.
2. the economizer part that then flue gas enters IWE.
3. gas flow is through two strands of current, and main heat exchange occurs in the area of heating surface of low flow low temperature amount.
4. then flue gas leaves IWE.
give the control of water shunting
The setting of valve 26, and the control method of the first and second part current 22 that obtain thus and 24 relative confluent are similar to publication application US2007/0261646 with US2007/0261647.Under this method, an algorithm is developed with the stable situation condition on quantification theory, and wherein mass flowrate is used as input application.This algorithm is necessary, and in the time that stable situation can reach more than one hour or more for a long time, the real time temperature in economizer downstream is measured and misled potentially stable state in this case and do not reach like this.Once stable state reaches, this algorithm can be by " correction " (such as adjusting in proportion) to make up difference actual and theoretical operation.The use of this algorithm depends on actual size and the accessible mass flowrate of equipment.
Although specific embodiments of the invention are at length shown and describe, and so that application of the present invention and principle to be described, are appreciated that this does not show that the present invention is limited to this, and the present invention can implement in other mode not departing from this principle.Such as, the present invention can be applied to comprising the new construction of boiler or steam generator, or is applied to substitute, revises or be adapted to existing boiler or steam generator.In some embodiments of the invention, some feature of the present invention sometimes can be not and other the corresponding use of feature, is used to preferred enforcement.Correspondingly, all these changes and embodiment all fall into the protection domain of claim (comprising arbitrary and all situations that is equal to) subsequently.
Claims (2)
1. integrated water coil pipe air heater and the saver device by logarithmic mean temperature difference (LMTD) for improvement of boiler, comprising:
The feed-water intake of feedwater to boiler is provided;
Part flow arrangement, by feedwater from entrance be split into Part I high temperature, compared with the current of the current of low mass rate and Part II higher temperature, high flow;
Make to be heated the water coil air heater passing through for the air of boiler, the heat exchange loop that this water coil air heater comprises at least one and air generation heat exchange, the heat exchange loop of this water coil air heater is connected to accept Part I current with part flow arrangement;
Make the economizer that is cooled and passes through for the flue gas of boiler, the heat exchange loop that this economizer comprises at least one and flue gas generation heat exchange, the heat exchange loop of this economizer and the heat exchange loop of water coil air heater are connected to accept to come from the Part I current of water coil air heater;
Near mixing arrangement economizer downstream, for accepting also again to converge the first and second part current; With
The pipeline connecting between part flow arrangement and mixing arrangement, for making Part II current lead to mixing arrangement;
Wherein, described Part I current and described Part II current remain shunting in described economizer; And
Wherein, described Part I current are used as and the main media of described flue gas heat exchange.
2. the method by logarithmic mean temperature difference (LMTD) for improvement of boiler economizer, comprising:
Provide feedwater water to flow to boiler;
By these current be split into Part I high temperature, compared with the current of the current of low mass rate and Part II higher temperature, high flow;
Provide Part I water to flow to water coil air heater, the air being heated for boiler is passed through, the heat exchange loop that this water coil air heater comprises at least one and air generation heat exchange, Part I current flow through the heat exchange loop of this water coil air heater;
At Part I current after the heat exchange loop of this water coil air heater, Part I current are supplied to economizer, the flue gas being cooled for boiler is passed through, the heat exchange loop that this economizer comprises at least one and flue gas generation heat exchange, the Part I current that the come from water coil air heater heat exchange loop of economizer of flowing through;
Guiding Part II water flows to economizer downstream; With
Near economizer downstream, again converge the first and second part current;
Wherein, described Part I current and described Part II current remain shunting in described economizer; And
Wherein, described Part I current are used as and the main media of described flue gas heat exchange.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15877409P | 2009-03-10 | 2009-03-10 | |
| US61/158,774 | 2009-03-10 | ||
| US12/581,637 | 2009-10-19 | ||
| US12/581,637 US8286595B2 (en) | 2009-03-10 | 2009-10-19 | Integrated split stream water coil air heater and economizer (IWE) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101832546A CN101832546A (en) | 2010-09-15 |
| CN101832546B true CN101832546B (en) | 2014-08-20 |
Family
ID=42716707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010176763.3A Expired - Fee Related CN101832546B (en) | 2009-03-10 | 2010-03-09 | Integrated split stream water coil air heater and economizer (IWE) |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101832546B (en) |
| CA (1) | CA2696649C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5832103B2 (en) * | 2011-02-25 | 2015-12-16 | 三菱重工業株式会社 | Boiler plant |
| CN103953913A (en) * | 2014-03-28 | 2014-07-30 | 上海发电设备成套设计研究院 | Heat-exchange adjustable economizer system for whole-process operation of denitration equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE964502C (en) * | 1952-05-13 | 1957-05-23 | Foster Wheeler Ltd | Steam power plant with pre-heating by bleeding steam and by flue gases |
| US4403571A (en) * | 1981-12-09 | 1983-09-13 | Combustion Engineering, Inc. | Boiler with economizer heat absorption reduction |
| CN2555468Y (en) * | 2002-08-05 | 2003-06-11 | 涂建华 | Medium heat exchanger with split-flow and hybrid temp regulation |
| CN100516647C (en) * | 2007-06-05 | 2009-07-22 | 湖南大学 | Boiler high temperature feed water and air pre-system for discrete low-grade waste heat recovery |
-
2010
- 2010-03-09 CN CN201010176763.3A patent/CN101832546B/en not_active Expired - Fee Related
- 2010-03-09 CA CA2696649A patent/CA2696649C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101832546A (en) | 2010-09-15 |
| CA2696649C (en) | 2016-10-04 |
| CA2696649A1 (en) | 2010-09-10 |
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| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: Ohio, USA Patentee after: THE BABCOCK & WILCOX Co. Address before: louisiana Patentee before: THE BABCOCK & WILCOX Co. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 |