Precise SNCR (selective non-catalytic reduction) denitration system with intelligent optimization and control method thereof

Abstract

The invention relates to a precise SNCR (selective non-catalytic reduction) denitration system with intelligent optimization and a control method thereof, the system comprises a decomposing furnace and a cyclone, a plurality of jet layers sequentially distributed in the axial direction are arranged in an air outlet of the decomposing furnace and an air outlet of the cyclone, and correspondingly, the jet layers are distributed in the axial direction. The air outlet of the decomposing furnace and the air outlet of the cyclone are internally provided with temperature measuring devices with the same number, and each temperature measuring device is matched with the corresponding spraying layer; each spraying layer comprises a plurality of spraying gun devices which are uniformly distributed in the circumferential direction at equal angles; the optimal spraying position and the optimal spraying depth can be found, the gas-liquid flow of each spraying gun device can be automatically adjusted through a valve set so that whole-process closed-loop control can be achieved, and then the use amount of ammonia water is greatly reduced so that the production cost can be remarkably reduced; meanwhile, the adaptive capacity of the denitration system under different working conditions is greatly improved.

Description

technical field [0001] The invention relates to a precise SNCR denitrification system with intelligent optimization and a control method thereof. Background technique [0002] At present, the problem of environmental pollution is becoming more and more serious, and the requirements for environmental protection indicators in various industries are becoming more and more stringent. Some provinces and cities have taken the lead in proposing ultra-low emission requirements, reducing flue gas NO X Emission control at 50mg / Nm 3 the following. [0003] At present, the most widely used NO X Emission reduction technologies are selective non-catalytic reduction (SNCR) technology and staged combustion technology; the input cost of staged combustion technology is relatively high, and the popularity rate of use is getting lower and lower; while selective non-catalytic reduction (SNCR) technology is ammonia solution The NO X reduced to N 2 and H 2 O, thus achieving NO X Emission re...

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Problems solved by technology

[0003] At present, the most widely used NO X Emission reduction technologies are selective non-catalytic reduction (SNCR) technology and staged combustion technology; the input cost of staged combustion technology is relatively high, and the popularity rate of use is getting lower and lower; while selective non-catalytic reduction (SNCR) technology is ammonia solution The NO X reduced to N 2 and H 2 O, thus achieving NO X Emission reduction has the advantage of lower input costs; however, the main problem of this technology is that the denitrification efficiency is greatly affected by temperature, and the overall efficiency is low. During the production of cement enterprises, there will be temperature fluctuations in the kiln, and the temperature at the place where ammonia water is injected will deviate from its normal temperature. Optimum reaction temperature, in order to ensure the export discharge index, can only increase the amount of ammonia water, which will greatly increase the cost of cement production and at the same time will generate a large amount of ammonia escape, causing secondary pollution; at the same time, the ammonia water injection point cannot be adjusted in real time according to changes in working conditions. Poor adaptability, prone to NOx exceeding the standard, urgently need to wait for a solution

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