Process for treating gas water for producing gas by lurgi furnace

Abstract

The invention relates to a gas water treatment method for Lurgi furnace coal-to-gas, comprising: high-pressure gas water undergoes flash evaporation to remove dissolved gas, and then removes solid matter through a tar separator to obtain primary gas water; primary gas water is pressurized by partial reflux The dissolved air flotation process removes oil and suspended matter to obtain the first-grade gas water; the first-grade gas water is processed by a double-media filter to obtain the second-grade gas water; the second-grade gas water is sent to the medium-pressure stripper for stripping to obtain the final-grade gas water , the vapor phase is sent to the Lurgi furnace for decomposition. Part of the final gas water reuses the converted gas in the washing and cooling section; part of the secondary gas water reuses the wet gas in the washing and cooling section, and then dedusts and humidifies the crude gas, and then reuses it in the coal-to-gas section to wash dirty gas. The invention improves the reuse rate of the gas water through the comprehensive treatment of step-by-step treatment and graded reuse.

Description

technical field [0001] The present invention relates to a comprehensive treatment method of coal gas and water, more precisely, it relates to a new coal gas water comprehensive treatment process of Lurgi furnace coal gas, the process adopts flash separation, air flotation filtration, medium pressure steam The method of raising grades comprehensively treats gas water. Background technique [0002] Lurgi furnace crushed coal pressurized gasification technology was successfully developed by German Lurgi company in the late 1970s. This technology was successfully used in the production of city gas and synthetic ammonia with coal as raw material. There are currently 4 sets of equipment in my country that have adopted Lurgi furnace crushed coal pressurized gasification technology. [0003] The raw gas water treatment process design process of the Luqi Furnace Coal-to-Gas Plant of Tianji Coal Chemical Group Co., Ltd. is as follows: the high-pressure gas water from the coal-to-gas ...

AI Technical Summary

Problems solved by technology

In the design process of the raw gas water treatment process, only dual-media filter is used to treat it. However, due to the high content of oil and suspended solids, the dual-media filter has poor filtering effect and often blocks the filter bed, which seriously affects The water passing capacity of the device

[0007] 3. The ammonia content in gas water is relatively high

In the design process of the raw gas water treatment process, it is designed to recover this part of ammonia, but the actual operation of the device shows that the recovery is difficult due to the unstable concentration of ammonia

More urgently, the processing accuracy of the original gas water treatment process design process can no longer meet today's environmental protection requirements

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