Denitration device potential assessment and prediction method based on field performance tests

Abstract

The invention relates to a denitration device potential assessment and prediction method based on field performance tests. The concentration of NO at an actually running inlet, the concentration of NO at an actually running outlet and the ammonia escape concentration at the actually running outlet of a smoke denitration device are measured, then, the denitration efficiency and the molar ratio of NH3 / NO at the inlet of the denitration device are calculated, the potential of the denitration device is calculated according to the denitration efficiency and the molar ratio of NH3 / NO, and then a degradation time function of the potential of the denitration device is obtained through regression. According to the denitration device potential assessment and prediction method based on field performance tests, a denitration reactor in the field directly serves a performance detection object, the actual smoke parameter distribution of the denitration device and the running conditions of the denitration device in the state of being blocked by catalysts can be reflected from the macroscopical point, and assessment and prediction are more accurate. The overall inlet and outlet smoke parameters of the denitration device are tested through the field performance tests and used for assessing the macro service life of the denitration device, and therefore test data from traditional field performance tests are further applied. Shutdown is not needed for the field performance tests, and thus the influences on the running of a generator set are reduced.

Description

technical field [0001] The invention belongs to the field of selective catalytic reduction flue gas denitrification in thermal power plants, and in particular relates to a method for evaluating and predicting the potential of a denitrification device based on on-site performance testing. Background technique [0002] When thermal power plants burn fossil fuels such as coal and natural gas, a large amount of nitrogen oxides are produced, causing serious harm to the atmospheric environment. While using low-nitrogen combustion technology to greatly reduce the amount of nitrogen oxides produced in the furnace, in order to reduce the concentration of nitrogen oxides to 100mg / m 3 Even 50mg / m 3 In the following, selective catalytic reduction flue gas denitrification technology is widely used for deep nitrogen oxide control. The selective catalytic reduction flue gas denitrification technology is to arrange a denitrification device in the flue gas temperature range of 300-400 ℃ be...

AI Technical Summary

Problems solved by technology

The pilot test device in the laboratory can simulate the design flue gas conditions of the denitrification device, but it needs to be shut down to collect catalyst samples. Some units have been running continuously for nearly 2 years, which prolongs the catalyst detection cycle, while the partial online method only tests a limited number of catalyst samples. None of them can fully reflect the macroscopic impact of the actual flue gas distribution and fly ash blockage on the performance of the entire denitrification device. The detected catalyst activity or device potential is often higher than the actual operating performance. The catalyst replacement time thus formulated may be too late, affecting NOx compliance emission

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