Method and system for detecting average ammonia escape value of SCR denitration device based on ammonia water reducing agent

Abstract

The invention provides a method and a system for detecting the average ammonia escape value of an SCR (selective catalytic reduction) denitration device based on an ammonia water reducing agent. The method comprises the following steps: obtaining the nitrogen oxide concentration decrease value of the SCR denitration device, the ammonia water consumption of the SCR denitration device and the valueof smoke flowing through the SCR denitration device; calculating the ammonia consumption of the SCR denitration device according to the nitrogen oxide concentration decrease value, the smoke value, and the proportion of ammonia in the nitrogen oxide concentration decrease value; and calculating the average ammonia escape value of the outlet of the SCR denitration device according to the ammonia water consumption of the SCR denitration device, the ammonia consumption of the SCR denitration device and the smoke value. The method and the system overcome the defects of single point measurement errors and uneven smoke distribution by indirectly detecting the average ammonia escape value of the outlet of the SCR denitration device, comprehensively consider the actual consumption of ammonia waterand the consumption of ammonia participating in the reaction of the SCR denitration device, and have a practical guiding effect on the running of the SCR denitration device.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, and in particular to a method and system for measuring the mean value of ammonia escape of an SCR denitrification device based on an ammonia water reducing agent. Background technique [0002] In order to comply with the national ultra-low emission requirements of coal-fired units and the trend of flexible peak-shaving of coal-fired power plants, power plants have higher and higher performance requirements for thermal power unit denitrification devices. After the coal-fired unit has been in operation for a long time, the ammonia escape at the outlet of the denitrification device will be unevenly distributed on the same cross-section. During the actual adjustment process, it is found that the ammonia escape at the outlet of the SCR (Selective Catalytic Reduction) denitrification device in most power plants is measured at a single point, and the results deviate from the average val...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects in the prior art, the present invention provides a method and system for measuring the average value of ammonia escape of SCR denitrification devices based on ammonia water reducing agent, and overcomes the single-point measurement by indirectly determining the average value of ammonia escape at the outlet of the SCR denitrification device. Errors and uneven distribution of flue gas, overall consideration of the actual consumption of ammonia water and the consumption of ammonia gas reaction in the SCR denitrification device has practical significance for guiding the operation of the SCR denitrification device

Images