System for reducing ammonia nitrogen content and method for reducing ammonia nitrogen content

Abstract

The invention relates to the technical field of coal gasification and gas conversion, and discloses a system for reducing ammonia nitrogen content and a method for reducing ammonia nitrogen content. The system includes: a high-temperature condensate treatment device, which is used to use the input high-pressure flash steam to strip the input high-temperature shift condensate to produce a high-temperature condensate with ammonia content that meets the conditions, and to strip the stripped steam generated after stripping. After the gas-liquid separation process, the gas-phase products and liquid-phase products are output to the low-temperature condensate treatment device; the low-temperature condensate treatment device is used to use the input low-pressure steam and gas-phase products to strip the liquid-phase products and the input low-temperature shift condensate Produce low-temperature condensate with ammonia content meeting the conditions, and perform gas-liquid separation on the stripping steam generated after stripping to produce ammonia-containing condensate and flash steam non-condensable gas. The invention can reduce the ammonia nitrogen content in the black water and gray water of the gasification process unit, and reduce the ammonia nitrogen content of the gray water discharged from the gasification process unit to the level that the sewage can be better accepted.

Description

technical field [0001] The invention relates to the technical field of coal gasification and gas conversion, in particular to a system for reducing ammonia nitrogen content and a method for reducing ammonia nitrogen content. Background technique [0002] The coal water slurry gasification process is based on the partial oxidation reaction of coal water slurry and high pressure oxygen through high temperature and high pressure, and the reaction products are crude gas and liquid slag. The gasification product enters the water bath of the quench chamber with a certain water level through the downcomer, and the slag solidifies in the water bath and sinks to the bottom of the gasifier equipment, and is regularly discharged through the lock hopper. Crude gas is mainly composed of carbon monoxide, carbon dioxide, and hydrogen, and there are also some impurities such as ammonia nitrogen. The crude gas escapes and rises to the gas outlet located on the upper part of the quenching ch...

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Problems solved by technology

[0008] There are many patented technologies reported now, and these patents only deal with the stripping of the shifted low-temperature condensate (mainly the washing water of the shifted gas scrubbing tower), and do not deal with the high-temperature shifted condensate that accounts for a large proportion of the shift. , so the problem of high ammonia nitrogen content in the black water and gray water of the gasification process unit has not been solved well

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