An automatic ammonia addition system and method applied to an ammonia desulfurization device

Abstract

The invention discloses an automatic ammonia addition system applied to an ammonia desulfurization device. 2 Concentration, outlet flue gas SO 2 The expected concentration automatically calculates the theoretical ammonia addition amount; half of the ratio of the actual ammonia addition amount / actual sulfur dioxide removal amount is used as the theoretical ammonia addition amount correction coefficient to calculate the corrected theoretical ammonia addition amount; through the ammonia addition metering method and the ammonia addition adjustment valve Add the corrected theoretical ammonia addition amount ± 10% of the ammonia absorbent to the ammonia desulfurization device, and then pass the actual SO 2 Concentration and / or actual SO in outlet flue gas 2 The concentration change trend is used as a back feed to automatically adjust the actual ammonia flow rate to realize automatic ammonia addition. The invention also discloses an automatic ammonia addition method applied to an ammonia desulfurization device. The automatic ammonia addition system and method of the present invention can realize automatic ammonia addition while ensuring that the clean flue gas meets the ultra-low emission requirement, the system is stable and reliable in operation, has a high degree of automation and a simple process.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an automatic ammonia addition system and method applied to an ammonia desulfurization device. Background technique [0002] At present, the mainstream processes for removing sulfur dioxide from gases in the world are limestone desulfurization method and ammonia desulfurization method. The limestone desulfurization method will produce a large amount of waste water and gypsum slag during the desulfurization process, and the treatment of these waste water and waste residue requires a lot of investment and operation costs. Moreover, in the limestone desulfurization method, about 0.7 tons of carbon dioxide are simultaneously produced for every 1 ton of sulfur dioxide removed. The ammonia desulfurization method basically does not produce waste water and waste residue, and the input desulfurizer ammonia is converted into useful ammonium sulfate fertilizer, ...

AI Technical Summary

Problems solved by technology

However, the existing ammonia desulfurization methods often have problems such as ammonia escape and aerosol formation.

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