CN106769355A - A kind of multicomponent flue gas analyzer interference blanking unit and method - Google Patents
A kind of multicomponent flue gas analyzer interference blanking unit and method Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000003546 flue gas Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 81
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 239000012528 membrane Substances 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000000741 silica gel Substances 0.000 claims abstract description 9
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 9
- 239000002808 molecular sieve Substances 0.000 claims abstract description 8
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 5
- 239000010935 stainless steel Substances 0.000 claims abstract description 5
- 239000005388 borosilicate glass Substances 0.000 claims abstract description 4
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- 238000012544 monitoring process Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/104—Oxygen
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
本发明公开了一种烟气分析仪干扰消除装置和方法包括本体，本体上依次设置送气机构，进气口、粉尘过滤膜、气体分离柱、气体泵和出气口，本体外设有恒温装置，所述的送气机构包括环境温度传感器，控制器和电磁阀，所述的环境温度传感器用以监测实时环境温度并传送给控制器，所述的控制器根据实时环境温度控制电磁阀实现送气流量的实时调整，所述的粉尘过滤膜为100％硼硅酸玻璃纤维膜，所述的气体分离柱为串联的不锈钢管分子筛和硅胶柱，所述的气体泵用以保证被分析气体能以一定速率和压力通过出气口，以保证烟气分析仪的分析效果。
The invention discloses a device and method for eliminating interference of a flue gas analyzer. The air supply mechanism includes an ambient temperature sensor, a controller and a solenoid valve. The ambient temperature sensor is used to monitor the real-time ambient temperature and transmit it to the controller. The controller controls the solenoid valve according to the real-time ambient temperature to realize the adjustment of the air flow rate. Real-time adjustment, the dust filter membrane is 100% borosilicate glass fiber membrane, the gas separation column is a stainless steel tube molecular sieve and silica gel column connected in series, and the gas pump is used to ensure that the analyzed gas can And pressure through the gas outlet to ensure the analysis effect of the flue gas analyzer.
Description
技术领域technical field
本发明属于烟气分析仪领域，尤其是涉及一种多组分烟气分析仪干扰消除装置和方法。The invention belongs to the field of flue gas analyzers, in particular to a multi-component flue gas analyzer interference elimination device and method.
背景技术Background technique
烟气分析仪主要用于测量污染源排放气体中的二氧化硫、氮氧化物、一氧化碳等有害气体及氧气的浓度，常见的主要有定电位电解法、非分散红外吸收法等。然而，由于气体分子尺寸或者电极电位等物化性能的相似性，使得待测气体之间存在交叉干扰，即传感器对目标气体之外的其他气体产生的响应，这些干扰严重影响现场烟气测量数据的准确性。目前干扰消除的方法主要有选择特性电极材料及改进催化剂提高传感器的选择性、施加“偏置”电压增加传感器、内置化学过滤器与干扰气体发生化学反应或将之吸附从而选择性的除去干扰气体等方法。但是上述方法主要是将干扰气体消除或降低，却不能实现多组分气体的共同检测，此外，“偏置”电压的增加还会降低仪器的灵敏度，同时烟气中存在的固体颗粒杂质会严重干扰检测过程，导致分析精度降低。The flue gas analyzer is mainly used to measure the concentration of sulfur dioxide, nitrogen oxides, carbon monoxide and other harmful gases and oxygen in the exhaust gas of pollution sources. The common methods are constant potential electrolysis method and non-dispersive infrared absorption method. However, due to the similarity of physical and chemical properties such as gas molecular size or electrode potential, there is cross-interference between the gases to be measured, that is, the response of the sensor to other gases other than the target gas. These interferences seriously affect the accuracy of on-site flue gas measurement data. accuracy. The current interference elimination methods mainly include selecting characteristic electrode materials and improving the catalyst to improve the selectivity of the sensor, applying a "bias" voltage to increase the sensor, and building a chemical filter to chemically react with the interfering gas or adsorb it to selectively remove the interfering gas. and other methods. However, the above method is mainly to eliminate or reduce interfering gases, but it cannot realize the common detection of multi-component gases. In addition, the increase of "bias" voltage will also reduce the sensitivity of the instrument, and the solid particle impurities in the flue gas will seriously Interfering with the detection process, resulting in reduced analysis accuracy.
发明内容Contents of the invention
为解决上述技术问题，本发明提供了一种多组分烟气分析仪的干扰消除装置，通过前置一种高效过滤装置和快速气体分离装置，实现对混合烟气的分离，从而真正实现多种组分烟气的同时、准确、高效测定，填补了国内空白。In order to solve the above technical problems, the present invention provides an interference elimination device for a multi-component flue gas analyzer, which realizes the separation of mixed flue gas by pre-installing a high-efficiency filter device and a rapid gas separation device, thereby truly realizing multi-component flue gas analysis. Simultaneous, accurate and efficient determination of flue gas of various components, filling the gap in China.
本发明完整的技术方案包括：The complete technical scheme of the present invention comprises:
一种烟气分析仪干扰消除装置，包括本体，本体上依次设置进气口、粉尘过滤膜、气体分离柱、气体泵和出气口，本体外设有恒温装置；An interference elimination device for a flue gas analyzer, comprising a body on which an air inlet, a dust filter membrane, a gas separation column, a gas pump and an air outlet are sequentially arranged, and a constant temperature device is arranged outside the body;
进气口还连接送气机构，所述的送气机构包括环境温度传感器，控制器和电磁阀，所述的环境温度传感器用以监测实时环境温度并传送给控制器，所述的控制器根据实时环境温度控制电磁阀实现送气流量的实时调整；The air inlet is also connected to the air supply mechanism, and the air supply mechanism includes an ambient temperature sensor, a controller and a solenoid valve. The ambient temperature sensor is used to monitor the real-time ambient temperature and transmit it to the controller. The controller according to the real-time environment The temperature control solenoid valve realizes the real-time adjustment of the air supply flow;
所述的粉尘过滤膜为100％硼硅酸玻璃纤维膜，The dust filter membrane is 100% borosilicate glass fiber membrane,
所述的气体分离柱为串联的不锈钢管分子筛和硅胶柱，所述的不锈分子筛截面为8mm×500mm，孔径尺寸为5A级，硅胶柱中颗粒粒度为80～100目；The gas separation column is a stainless steel tube molecular sieve and a silica gel column connected in series, the cross section of the stainless molecular sieve is 8mm×500mm, the pore size is 5A grade, and the particle size in the silica gel column is 80-100 mesh;
所述的气体泵用以保证被分析气体能以一定速率和压力通过出气口，以保证烟气分析仪的分析效果。The gas pump is used to ensure that the gas to be analyzed can pass through the gas outlet at a certain rate and pressure, so as to ensure the analysis effect of the flue gas analyzer.
所述的粉尘过滤膜厚度为0.3mm，滤孔孔径为0.7um，最高可承受300℃高温，截留分子量为10000，对杂质的截留率90％以上。The dust filter membrane has a thickness of 0.3mm, a filter hole diameter of 0.7um, can withstand a high temperature of 300°C, a molecular weight cut-off of 10,000, and a retention rate of more than 90% for impurities.
所述的气体分离柱将SO2、NO、NO2、O2气体依次分离，使不同气体组分依次按序进入烟气分析仪分析。The gas separation column separates SO 2 , NO, NO 2 , and O 2 gases sequentially, so that different gas components enter the flue gas analyzer in sequence for analysis.
所述的恒温装置温度为40℃。The temperature of the thermostat is 40°C.
所述烟气分析仪干扰消除装置对气体的相互分离度为99.9％以上。The mutual separation of gases by the interference elimination device of the flue gas analyzer is above 99.9%.
利用所述的装置进行气体干扰消除的方法，包括如下步骤：The method for eliminating gas interference by using the device comprises the following steps:
(1)开启送气机构，环境温度传感器监测实时环境温度并传送给控制器，控制器控制电磁阀实现送气流量的实时调整；(1) Turn on the air supply mechanism, the ambient temperature sensor monitors the real-time ambient temperature and transmits it to the controller, and the controller controls the solenoid valve to realize the real-time adjustment of the air supply flow;
(2)气体通过进气口进入本体，在恒温装置下被加热到40℃，同时通过粉尘过滤膜，将对气体分离柱产生损害的杂质隔离在分离工作区域外，截留率不小于90％；(2) The gas enters the body through the air inlet, is heated to 40°C under the constant temperature device, and at the same time passes through the dust filter membrane to isolate the impurities that cause damage to the gas separation column from the separation work area, and the retention rate is not less than 90%;
(3)气体经过过滤膜净化后进入气体分离柱，根据其分子量与极性不同，将SO2、NO、NO2、O2等不同气体组分依次分离，按序通过气体泵，相互分离度为99.9％；(3) After the gas is purified by the filter membrane, it enters the gas separation column. According to its molecular weight and polarity, different gas components such as SO 2 , NO, NO 2 , O 2 are separated in sequence, and they pass through the gas pump in sequence. 99.9%;
(4)气体泵保证被分析气体能以送气压力0.1MPa恒压通过出气口，进入烟气分析仪分析，实现多组分气体的共同检测。(4) The gas pump ensures that the gas to be analyzed can pass through the gas outlet at a constant pressure of 0.1 MPa, and enter the flue gas analyzer for analysis, realizing the common detection of multi-component gases.
本发明相对于现有技术的优点在于：The present invention has the advantage over prior art that:
1.采用前置一种高效过滤装置和快速气体分离装置，实现对混合烟气的分离，正实现多种组分烟气的同时、准确、高效测定。1. A high-efficiency filter device and a rapid gas separation device are used in front to realize the separation of mixed flue gas, and the simultaneous, accurate and efficient determination of flue gas of various components is being realized.
2.针对需求，采用合理的过滤器结构，提高了过滤效果和分离效率。2. According to the demand, a reasonable filter structure is adopted to improve the filtering effect and separation efficiency.
3.采用串联的不锈钢管分子筛和硅胶柱作为分离柱并合理设计其结构，使所要分析的SO2、NO、NO2、O2气体的通过速率实现了合理的差异，保证后续分析的效果。3. The series stainless steel tube molecular sieve and silica gel column are used as the separation column and the structure is reasonably designed to achieve a reasonable difference in the passage rate of SO 2 , NO, NO 2 , O 2 gas to be analyzed, ensuring the effect of subsequent analysis.
4.恒温装置，送气机构的设置，保证了不同环境下得到稳定的干扰消除效果，保证了数据的可参考性。4. The constant temperature device and the setting of the air supply mechanism ensure the stable interference elimination effect in different environments and ensure the referenceability of the data.
附图说明Description of drawings
图1为本发明烟气分析仪干扰消除装置结构示意图。Fig. 1 is a schematic structural diagram of the interference elimination device for the flue gas analyzer of the present invention.
图中1-进气口，2-出气口，3-粉尘过滤膜，4-气体分离柱，5-恒温装置，6-气体泵：In the figure 1-inlet, 2-outlet, 3-dust filter membrane, 4-gas separation column, 5-thermostat, 6-gas pump:
具体实施方式detailed description
下面结合附图和具体实施方式对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
一种烟气分析仪干扰消除装置，包括本体，本体上依次设置进气口1、粉尘过滤膜3、气体分离柱4、气体泵6和出气口2，本体外设有恒温装置5；An interference elimination device for a flue gas analyzer, comprising a body on which an air inlet 1, a dust filter membrane 3, a gas separation column 4, a gas pump 6 and an air outlet 2 are arranged in sequence, and a constant temperature device 5 is arranged outside the body;
进气口外还连接送气机构，所述的送气机构包括环境温度传感器，控制器和电磁阀，所述的环境温度传感器用以监测实时环境温度并传送给控制器，所述的控制器根据实时环境温度控制电磁阀实现送气流量的实时调整，由于本发明的烟气分析仪干扰消除装置需要在恒温下实现其最佳的干扰消除装置，而由于传热需要时间，送气量过大或过小，气体温度高或低，将导致送入烟气不能在极短时间内达到恒温，影响分离效果、或者降低效率，而不同季节和地域的环境温度差别较大，由此造成待分析气体的温度压力有较大变化，因而为保证最佳的干扰消除效果，采用对环境温度进行实时监测的方法，根据温度监测结果并结合预设的程序控制送气的流量，控制器根据温度监测结果进行计算，通过进气口的截面积和流速，并根据气体温度压力公式计算送入气体流量，以保证送入气体在恒温装置下能迅速达到40℃恒温，保证分离效果；上述的环境温度传感器和电磁阀可采用市售的商用产品，控制器可采用常规的PLC控制系统。An air delivery mechanism is also connected outside the air inlet, and the air supply mechanism includes an ambient temperature sensor, a controller and a solenoid valve. The ambient temperature sensor is used to monitor the real-time ambient temperature and transmit it to the controller, and the controller according to the real-time environment The temperature control solenoid valve realizes the real-time adjustment of the air supply flow rate. Since the interference elimination device of the flue gas analyzer of the present invention needs to realize its best interference elimination device at a constant temperature, and because the heat transfer takes time, the air supply volume is too large or too small. If the gas temperature is high or low, the flue gas cannot reach a constant temperature in a very short time, which will affect the separation effect or reduce the efficiency. However, the ambient temperature varies greatly in different seasons and regions, resulting in the temperature and pressure of the gas to be analyzed. There are large changes, so in order to ensure the best interference elimination effect, the method of real-time monitoring of the ambient temperature is adopted, and the flow rate of the air supply is controlled according to the temperature monitoring results combined with the preset program. The controller calculates according to the temperature monitoring results. The cross-sectional area and flow rate of the air inlet, and calculate the flow rate of the incoming gas according to the formula of gas temperature and pressure, so as to ensure that the incoming gas can quickly reach a constant temperature of 40°C under the constant temperature device to ensure the separation effect; the above-mentioned ambient temperature sensor and solenoid valve can be A commercially available product is adopted, and the controller can adopt a conventional PLC control system.
所述的粉尘过滤膜是一种白色100％硼硅酸玻璃纤维膜，厚度为0.3mm，滤孔孔径为0.7um，最高可承受300℃高温，截留分子量为10000，可以将绝大部分对气体分离柱产生损害的杂质隔离在分离工作区域外，截留率可达90％以上，The dust filter membrane is a white 100% borosilicate glass fiber membrane with a thickness of 0.3mm and a filter pore diameter of 0.7um. Impurities that cause damage to the separation column are isolated outside the separation work area, and the retention rate can reach more than 90%.
气体经过过滤膜净化后进入气体分离柱，气体分离柱为尺寸为8mm×500mm的不锈钢管分子筛，与硅胶柱串联，硅胶柱中颗粒粒度为80～100目。硅胶柱可以分离CO2气体，分子筛的孔径尺寸为5A级，根据其分子量与极性不同，可以将SO2、NO、NO2、O2等气体分离，从而达到将不同气体组分依次分离，按序进入分析仪分析的目的。After the gas is purified by the filter membrane, it enters the gas separation column. The gas separation column is a stainless steel tube molecular sieve with a size of 8mm×500mm, which is connected in series with the silica gel column. The particle size of the silica gel column is 80-100 mesh. The silica gel column can separate CO 2 gas. The pore size of the molecular sieve is 5A grade. According to its molecular weight and polarity, it can separate SO 2 , NO, NO 2 , O 2 and other gases, so as to separate different gas components in sequence. Enter the purpose of the analyzer analysis in sequence.
气体泵用来保证被分析气体能以一定速率通过该装置，同时此速率不会过大使得过滤膜与分离柱超负荷工作。对于该装置，送气压力以0.1MPa为宜。The gas pump is used to ensure that the analyzed gas can pass through the device at a certain rate, and at the same time, the rate will not be too high to overload the filter membrane and the separation column. For this device, the air supply pressure is preferably 0.1MPa.
通过该装置出气口与烟气分析仪的连接，可以使多组分的烟气依次通过烟气分析仪，而不是同时通过，这样就消除了气体之间的干扰，从而实现多组分烟气的同时、去干扰测定。Through the connection between the gas outlet of the device and the flue gas analyzer, the multi-component flue gas can pass through the flue gas analyzer in sequence, instead of passing through at the same time, thus eliminating the interference between gases, thereby realizing multi-component flue gas Simultaneous, interference-free measurement.
在送气压力0.1MPa，恒温装置保持40℃时，气体经过净化装置后根据分子量依次从小到大顺序依次进入分析装置，相互分离度为99.9％，既保证了气体的全分析，同时也将干扰相互分离，实现多组分气体的共同检测。When the gas supply pressure is 0.1MPa and the constant temperature device is maintained at 40°C, the gas passes through the purification device and enters the analysis device in sequence according to the order of molecular weight from small to large. Separation to achieve common detection of multi-component gases.
以上所述，仅是本发明的较佳实施例，并非对本发明作任何限制，凡是根据本发明技术实质对以上实施例所作的任何简单修改、变更以及等效结构变化，均仍属于本发明技术方案的保护范围内。The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.
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