CN111639782B - SCR (Selective catalytic reduction) denitration device SO of coal-fired power plant2/SO3Conversion rate prediction method - Google Patents
SCR (Selective catalytic reduction) denitration device SO of coal-fired power plant2/SO3Conversion rate prediction method Download PDFInfo
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- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Inorganic materials O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 108700018263 Brassica oleracea SCR Proteins 0.000 claims abstract description 9
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- 238000004458 analytical method Methods 0.000 claims description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 5
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- 229910000147 aluminium phosphate Inorganic materials 0.000 description 5
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a coal-fired power plant SCR denitration device SO2/SO3A conversion rate prediction method belongs to the field of industrial waste gas purification, environmental protection and energy. The invention determines the type of the catalyst, the inlet smoke temperature and the inlet SO by collecting relevant data aiming at the work of carrying out data collection, field test, laboratory detection and the like on the SCR denitration device of the specific coal-fired power plant2Concentration, catalyst V2O5Content, catalyst WO3/MoO3The parameters such as content and surface speed are determined, the comprehensive performance correction coefficient is determined according to the performance change condition of the SCR denitration device, and the obtained result is substituted into the SO of the SCR denitration device of the coal-fired power plant2/SO3Calculating by a conversion rate prediction model to obtain SO2/SO3And the conversion rate is predicted value, so that the operation management work of the SCR denitration device and downstream equipment is effectively guided. The method can ensure the stable, reliable and economic operation of the denitration device and downstream equipment.
Description
Technical Field
The invention belongs to the field of industrial waste gas purification, environmental protection and energy, and particularly relates to a coal-fired power plant SCR (selective catalytic reduction) denitration device SO2/SO3A method for predicting conversion rate.
Background
The energy structure mainly based on coal in China can not be changed for a long time, so that the control of the emission of the coal-fired flue gas pollutants is an important work for governing atmospheric pollution in China. Under the situation that the conventional flue gas pollutants of the current coal-fired power plant comprehensively require ultralow emission, SO 3Emission is relatively lack of control means, so that harmfulness to ecological environment and power production is high, and all parties pay more and more attention to the emission. On the other hand, the current most widely applied flue gas denitration technology of coal-fired power plants is Selective Catalytic Reduction (SCR) denitration technology, and V is used for denitration2O5The catalyst as the main active substance can lead about 0.5-1.5% of SO in the flue gas2Oxidation to SO3Become flue gas SO of coal-fired power plant3Important sources of emissions, but the presence of SO for a particular coal-fired unit2/SO3The problem of large conversion rate fluctuation range and large test difficulty. If the SO of the SCR denitration device can be effectively predicted in real time2/SO3The conversion rate is of great benefit to the optimized operation of the SCR denitration device and the operation management of downstream equipment, and is a technical problem which needs to be solved urgently in the technical field of the current coal-fired flue gas denitration.
Based on the situation and the current situation, the invention provides the SCR denitration device SO of the coal-fired power plant through deep research aiming at the reaction mechanism, the influence characteristics and the influence rule2/SO3The conversion rate prediction method has the characteristics of systematicness, accuracy, strong operability and real-time prediction, and can generate obvious environmental protection benefits and economic benefits.
Patents related to the present invention, such as publication No. CN 100516870-SO in the process of producing phosphoric acid by dihydrate wet process 3Soft measurement of content by free SO in phosphoric acid extraction apparatus3The content is taken as a leading variable, and the flow rate of ore pulp is used,Parameters such as sulfuric acid flow, slurry flow, liquid level, phosphorus ore CaO content and the like are auxiliary variables, a dynamic mechanism soft measurement model of the wet-process phosphoric acid extraction device is established, and the soft measurement model is utilized to calculate the SO of the phosphoric acid extraction device in real time3And (4) content. However, the method is only suitable for the phosphoric acid production industry, and the SCR denitration device SO of the coal-fired power plant is aimed at by the invention2/SO3The conversion rate is completely different from the reaction mechanism, influence characteristics, influence parameters and the like, and cannot be used according to the reference.
Disclosure of Invention
The invention aims to solve the problem of the lack of an SCR denitration device SO for a coal-fired power plant2/SO3The difficult problem of predicting the conversion rate in a systematic, accurate and real-time manner is solved, and an SCR (selective catalytic reduction) denitration device SO of a coal-fired power plant is provided2/SO3A method for predicting conversion rate.
The technical scheme adopted by the invention for solving the problems is as follows: SCR (Selective catalytic reduction) denitration device SO of coal-fired power plant2/SO3The conversion rate prediction method is characterized in that the type of a catalyst, the inlet smoke temperature and the inlet SO are determined by collecting relevant data aiming at the work of carrying out data collection, field test, laboratory detection and the like on the SCR denitration device of a specific coal-fired power plant 2Concentration, catalyst V2O5Content, catalyst WO3/MoO3The parameters such as content and surface speed are determined, the comprehensive performance correction coefficient is determined according to the performance change condition of the SCR denitration device, and the obtained result is substituted into the SO of the SCR denitration device of the coal-fired power plant2/SO3Calculating by a conversion rate prediction model to obtain SO2/SO3The conversion rate is predicted, and the expression of a model equation is shown as a formula (1);
wherein XSO2/SO3For SCR denitration device SO2/SO3Conversion,%; x1Inlet smoke temperature, deg.C; x2Is an inlet SO2Concentration, mg/m3；X3As catalyst V2O5The content of the components is as follows,％；X4as catalyst WO3/MoO3Content,%; x5Is the surface speed, m/h; k is the comprehensive performance correction coefficient of the SCR denitration device; k1Is a constant coefficient; k2Is the inlet smoke temperature coefficient; k3Is an inlet SO2A concentration coefficient; k4As catalyst V2O5A content coefficient; k5As catalyst WO3/MoO3A content coefficient; k6Is the face velocity coefficient.
Further, the catalyst type comprises a honeycomb type and a flat plate type, and is determined according to the actual configuration catalyst type of a specific project by collecting project data.
Further, for honeycomb catalysts, K1The value is 61.737, K2The value is 3.371, K3The value is-0.812, K4The value is 2.171, K6The value is-0.228; for flat catalysts, K1The value is-78.533, K 2The value is 47.218, K3The value is-2.177, K4The value is 2.328, K6The value is-0.257; against the inclusion of WO3Catalyst of, K5A value of 1.282; for the MoO-containing3Catalyst of, K5The value is-2.331.
Further, for the SCR denitration device which is not put into operation, the inlet smoke temperature can be determined by collecting data according to the design coal economizer outlet smoke temperature of the coal-fired boiler or the design inlet smoke temperature of the SCR denitration device; aiming at the SCR denitration device in service, the inlet smoke temperature can adopt on-site on-line monitoring data and can also adopt on-site test data.
Further, the inlet SO is used for the SCR denitration device which is not put into operation2The concentration can be collected according to the data and the design inlet SO of the SCR denitration device2Determining the concentration; aiming at the SCR denitration device in service, on-site on-line monitoring data can be adopted, on-site test data can also be adopted, and coal quality analysis data accounting can also be adopted for determination.
Further, the catalyst V2O5The content can be determined by collecting data and according to the factory test report of the catalyst, orSampling in the field and carrying out laboratory detection analysis.
Further, the catalyst WO3/MoO3The content can be determined by collecting data according to a factory detection report of the catalyst, and can also be determined by sampling on site and carrying out laboratory detection analysis.
Further, for the SCR denitration device which is not put into operation, the surface speed can be determined according to the design surface speed of the SCR denitration device by collecting data; aiming at the SCR denitration device in service, the on-site on-line monitoring data, on-site test data and laboratory detection data can be combined, and the on-site on-line monitoring data, the on-site test data and the laboratory detection data are calculated and determined by the formula (2);
in the formula: a. theVIs the surface speed, m/h; q is the amount of flue gas, m3/h；qiVolume amount of catalyst in the i-th layer, m3；SAiIs the geometric specific surface area, m, of the catalyst of the i-th layer2/m3。
Further, aiming at the SCR denitration device which is not put into operation, the comprehensive performance correction coefficient of the SCR denitration device is 1; aiming at an in-service SCR denitration device, calculating and determining the comprehensive performance correction coefficient of the SCR denitration device according to a formula (3);
in the formula: k is the comprehensive performance correction coefficient of the SCR denitration device; ktThe activity of the catalyst at t of the SCR denitration device is m/h; k0Is the catalyst activity m/h of the SCR denitration device when newly put into operation.
Further, the catalyst activity of the SCR denitration device is determined by calculation according to the formula (4), wherein the denitration efficiency, the surface speed and the ammonia nitrogen molar ratio can be determined by calculation according to design parameters, on-site on-line monitoring data, on-site test data and laboratory detection data;
In the formula: k' is the catalyst activity of the SCR denitration device, and m/h; η is denitration efficiency,%; a. theVIs the surface speed, m/h; mRIs the ammonia nitrogen molar ratio.
Compared with the prior art, the invention has the following advantages and effects: by adopting the method, the SCR denitration device SO can be predicted systematically, accurately and in real time2/SO3The conversion rate ensures the stable, reliable and economic operation of the denitration device and downstream equipment, generates obvious environmental protection benefit, safety benefit and economic benefit, and has wide application prospect.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
The SCR denitration device of a 1000MW coal-fired unit of a certain power generation enterprise runs for 15000h, a honeycomb catalyst is configured, and SO of the denitration device at the moment needs to be predicted2/SO3And (4) conversion rate. Through collecting design data of the denitration device and field test and catalyst laboratory detection reports from operation, the volume amount of the catalyst, the geometric specific surface area of the catalyst and the catalyst V are determined 2O5Content, catalyst WO3/MoO3The catalyst activity of the content and denitration device in new operation is collected on site, and on-line monitoring data is collected to determine the inlet smoke temperature and the inlet SO2Concentration, inlet flue gas amount, inlet and outlet NOx concentration and outlet NH3Calculating the surface speed, the denitration efficiency, the ammonia nitrogen molar ratio and the catalyst activity of the denitration device, obtaining the comprehensive performance correction coefficient of the SCR denitration device by comparing the calculated activity of the denitration device at the moment with the activity of the denitration device in new operation, and finally substituting the obtained result into the SCR denitration device of the coal-fired power plantPut SO2/SO3Calculating by using the conversion rate prediction model to obtain SO of the SCR denitration device at the moment2/SO3And (4) predicting the conversion rate value, and further guiding the subsequent operation adjustment of the SCR denitration device and the operation and maintenance management of downstream equipment.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (8)
1. SCR (Selective catalytic reduction) denitration device SO of coal-fired power plant 2/SO3The conversion rate prediction method is characterized in that the catalyst type, the inlet smoke temperature and the inlet SO are determined by carrying out data collection, field test and laboratory detection work collection on the SCR denitration device of a specific coal-fired power plant2Concentration, catalyst V2O5Content, catalyst WO3/MoO3Content and surface speed parameters, determining a comprehensive performance correction coefficient according to the performance change condition of the SCR denitration device, and finally substituting the obtained result into the SO of the SCR denitration device of the coal-fired power plant2/SO3Calculating by a conversion rate prediction model to obtain SO2/SO3The conversion rate is predicted value, and a model equation expression is shown as a formula (1);
wherein, XSO2/SO3For SCR denitration device SO2/SO3Conversion,%; x1Inlet smoke temperature, deg.C; x2Is an inlet SO2Concentration, mg/m3；X3As catalyst V2O5Content,%; x4As catalyst WO3/MoO3Content,%; x5Is the surface speed, m/h; k isThe comprehensive performance correction coefficient of the SCR denitration device; k1Is a constant coefficient; k2Is the inlet smoke temperature coefficient; k3Is an inlet SO2A concentration coefficient; k4As catalyst V2O5A content coefficient; k5As catalyst WO3/MoO3A content coefficient; k6Is the face velocity coefficient;
aiming at the SCR denitration device which is not put into operation, the surface speed is determined according to the design surface speed of the SCR denitration device through collecting data; aiming at the SCR denitration device in service, combining on-site on-line monitoring data, on-site test data and laboratory detection data, and calculating and determining through the formula (2);
In the formula: a. theVIs the surface speed, m/h; q is the amount of flue gas, m3/h；qiVolume amount of catalyst in the i-th layer, m3；SAiIs the geometric specific surface area, m, of the catalyst of the i-th layer2/m3；
Aiming at an SCR denitration device which is not put into operation, the comprehensive performance correction coefficient of the SCR denitration device is 1; aiming at an in-service SCR denitration device, calculating and determining the comprehensive performance correction coefficient of the SCR denitration device according to a formula (3);
in the formula: k is the comprehensive performance correction coefficient of the SCR denitration device; ktThe activity of the catalyst at t of the SCR denitration device is m/h; k0Is the catalyst activity of the SCR denitration device in new operation, m/h.
2. The coal fired power plant SCR denitration device SO of claim 12/SO3A method for predicting conversion, characterized in that said catalyst types comprise honeycomb type and plate type, by collecting engineering data according to the concreteAnd determining the type of the actually configured catalyst of the engineering.
3. The coal fired power plant SCR denitration device SO of claim 22/SO3Method for predicting conversion, characterized in that for a honeycomb catalyst, K1The value is 61.737, K2The value is 3.371, K3The value is-0.812, K4The value is 2.171, K6The value is-0.228; for flat catalysts, K1The value is-78.533, K2The value is 47.218, K3The value is-2.177, K 4The value is 2.328, K6The value is-0.257; against the inclusion of WO3Catalyst of, K5A value of 1.282; for the MoO-containing3Catalyst of, K5The value is-2.331.
4. The coal fired power plant SCR denitration device SO of claim 12/SO3The conversion rate prediction method is characterized in that aiming at an SCR denitration device which is not put into operation, the inlet smoke temperature is determined according to the design coal economizer outlet smoke temperature of a coal-fired boiler or the design inlet smoke temperature of the SCR denitration device through collecting data; aiming at the SCR denitration device in service, the inlet smoke temperature adopts on-site on-line monitoring data or on-site test data.
5. The coal fired power plant SCR denitration device SO of claim 12/SO3The conversion rate prediction method is characterized in that the inlet SO is used for the SCR denitration device which is not put into operation2The concentration is obtained by collecting data according to the design inlet SO of the SCR denitration device2Determining the concentration; aiming at the SCR denitration device in service, on-site on-line monitoring data or on-site test data or coal quality analysis data accounting determination is adopted.
6. The coal fired power plant SCR denitration device SO of claim 12/SO3Method for predicting conversion, characterized in that said catalyst V2O5The content is determined by collecting data and carrying out factory inspection according to the catalyst And (4) determining a test report, or sampling on site to perform laboratory detection analysis.
7. The coal fired power plant SCR denitration device SO of claim 12/SO3Method for predicting the conversion, characterized in that said catalyst WO3/MoO3The content is determined by collecting data according to a factory detection report of the catalyst, or by sampling on site and carrying out laboratory detection analysis.
8. The coal fired power plant SCR denitration device SO of claim 12/SO3The conversion rate prediction method is characterized in that the catalyst activity of the SCR denitration device is determined by calculation according to the formula (4), wherein the denitration efficiency, the surface speed and the ammonia nitrogen molar ratio are determined by calculation according to design parameters, on-site on-line monitoring data, on-site test data and laboratory detection data;
in the formula: k' is the catalyst activity of the SCR denitration device, and m/h; η is denitration efficiency,%; a. theVIs the surface speed, m/h; mRIs the ammonia nitrogen molar ratio.
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| An Investigation of SO3 Control Routes in Ultra-low Emission Coal-fired Power Plants;Yang Zhang等;《Aerosol and Air Quality Research》;20191130;第19卷(第12期);第2908-2916页 * |
| 燃煤电站典型超低排放工艺的SO3脱除性能及排放特性;杨用龙 等;《中国电机工程学报》;20190520;第39卷(第10期);第2962-2969页 * |
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