SNCR denitration device without dilution water and control method thereof

Abstract

The invention relates to an SNCR denitration device without dilution water and a control method thereof. The SNCR denitration device comprises an ammonia water storage system, an ammonia water conveying system and an injection system which are sequentially connected; the injection system is provided with an air compression system, the ammonia water storage system, the ammonia water conveying system, the injection system and the air compression system are connected to a control system, and the control system is connected with an online flue gas monitoring system and a temperature measuring component. According to the SNCR denitration device, the online flue gas monitoring system and the temperature measuring component are utilized to achieve real-time signal feedback, the control system controls the ammonia water storage system, the ammonia water conveying system, the injection system and the air compression system to work, a dilution water system is not needed, the running and operating stability is improved, the thermal efficiency loss caused by dilution water is reduced, a series of problems caused when a large amount of water is sprayed into high-temperature to-be-denitrated devices are solved, the denitration efficiency is high, the space is saved, expensive catalysts are not used or a draught fan does not need to be replaced, the solution injection amount is automaticallyadjusted, the large-scale reformation of a boiler is not needed, the construction period is short, construction is conducted easily, the cost is reduced, and no secondary pollution is caused.

Description

technical field [0001] The present invention relates to the separation of gases or vapors; the recovery of vapors of volatile solvents from gases; the technical field of chemical or biological purification of waste gases such as engine exhaust, smoke, smoke, flue gas or aerosols, and in particular to a non-dilution A water SNCR denitrification device and a control method thereof. Background technique [0002] During the combustion process of coal, a large amount of harmful substances will be discharged. At present, my country has already controlled the dust, SO 2 , NO X etc. put forward control standard requirements, among which, NO X Emission concentration ≤ 200mg / Nm³. [0003] The English full name of SNCR is Selective Non-Catalytic Reduction, that is, the selective non-catalytic reduction method, which means that the reducing agent containing amino groups is evenly sprayed into the boiler furnace within a suitable temperature range without using a catalyst, and selecti...

AI Technical Summary

Problems solved by technology

When the reaction temperature is too high, the decomposition of ammonia will make NO X The reduction rate is reduced. On the other hand, when the reaction temperature is too low, the escape of ammonia will increase, which will also make NO X Reduced reduction

However, common denitrification devices use dilution water. The dilution water brings loss of thermal efficiency of the boiler, and at the same time, because a large amount of water is sprayed into the high-temperature furnace, it leads to thermal control disorder and inaccurate selection of temperature window, resulting in low denitrification efficiency. Expenses for catalysts are required, improvements such as replacement of induced draft fans are required, the investment cost and operating cost are relatively high, and large-scale transformation of the boiler is also required

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