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Online soft measurement method and system suitable for SCR catalyst of coal-fired power plant

A technology of SCR catalyst and SCR system, which is applied in the field of coal-fired production measurement, can solve the problems of inability to detect sampling representativeness on-line, and achieve the effects of improving sampling representativeness, ensuring accuracy and representativeness, and improving representativeness and accuracy

Pending Publication Date: 2022-07-29
CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH +3
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is how to solve the technical problem that cannot be detected online and the representativeness of sampling is low

Method used

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  • Online soft measurement method and system suitable for SCR catalyst of coal-fired power plant
  • Online soft measurement method and system suitable for SCR catalyst of coal-fired power plant
  • Online soft measurement method and system suitable for SCR catalyst of coal-fired power plant

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Embodiment 1

[0063] It is suitable for the online soft measurement method of SCR catalyst in coal-fired power plants, keeping the unit load reaching 100% BMCR and the NOX concentration at the denitration inlet reaching the design value in the stage of data acquisition; manually comparing the online instruments to ensure the accuracy of the instruments; The frequency of the points collected online data, a total of 20 sets of data, the parameters that need to obtain online data include: denitrification A side inlet NOX concentration C A , denitrification A side inlet flue gas volume Q A , Denitrification B side inlet NOX concentration C B , denitrification B side inlet flue gas volume Q B , the total exhaust NOX concentration C 2 , the molar amount of ammonia in the denitration system Calculate the CV value of the coefficient of variation for 20 data points of each parameter. Data points with a CV of more than 15% need to be eliminated from the data set, and the average value of each par...

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Abstract

The invention provides an on-line soft measurement method and system suitable for a coal-fired power plant SCR catalyst. The method comprises the steps that the unit load of a data acquisition stage is kept to reach 100% BMCR, and the NOx concentration of a denitration inlet reaches a design value; on-line instruments are compared manually, so that the accuracy of the instruments is ensured; on-line data are acquired at the frequency of one point in one minute, and 20 groups of data are acquired in total; calculating a weighted average value C1 of the NOX concentration at the denitration inlet; calculating the denitration efficiency eta of the whole SCR system; the total flue gas amount Q of the SCR system is calculated; calculating the surface velocity vA of the catalyst; the molar weight of NOX of the denitration system is calculated, and the ammonia nitrogen molar ratio MR of the denitration system is calculated; and calculating the activity K of the SCR catalyst. The technical problems that in the prior art, online detection cannot be achieved, and sampling representativeness is low are solved.

Description

technical field [0001] The invention relates to a coal-fired production measurement technology, in particular to an on-line soft measurement method and system for an SCR catalyst in a coal-fired power plant. Background technique [0002] After long-term operation of the SCR catalyst, the activity of the catalyst will decrease, which will lead to a decrease in the denitration efficiency and affect the environmental protection emission indicators of the coal-fired unit. Therefore, the power generation enterprise will regularly detect the catalyst activity. The current detection method of the SCR catalyst activity is mainly based on The method of DL / T 1286-2013 "Technical Specifications for Detection of Flue Gas Denitrification Catalysts in Thermal Power Plants", the method requires the extraction of catalyst modules for laboratory testing after the unit is shut down. [0003] The invention patent with the application number of CN202010248397.1, "A system for evaluating the ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/10
CPCG01N31/10
Inventor 汪鑫曹洪宇董文强袁林黄本宏俞立钱新凤罗小宇彭涛袁晓东侯大伟路程
Owner CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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