A pulverized coal gasification flash condensation system and process

Abstract

The invention discloses a powdered coal gasification flash condensing system and process. A gray water pipe of gray water generated by powdered coal gasification washing is sequentially connected witha real flash tank, a vertical pipe bundle condenser, a condensate tank, a condensate pump and a vacuum pump, wherein a gas phase outlet of the real flash tank is communicated with an inlet in the topof a pipe bundle of the vertical pipe bundle condenser, and an outlet in the bottom of the pipe bundle of the vertical pipe bundle condenser is communicated with an inlet of the condensate tank; a liquid phase outlet of the condensate tank is connected with an inlet of the condensate pump, and an outlet of the condensate pump is respectively connected with a settling-removing tank removal pipeline and a pipe bundle top flushing pipeline for removing the vertical pipe bundle condenser; a gas phase outlet of the condensate tank is connected with an inlet of the vacuum pump, and an outlet of thevacuum pump is connected with a discharge port. The powdered coal gasification flash condensing system and process disclosed by the invention can effectively ensure the heat exchange effect of the flash condenser, increase the condensation amount of flash steam, reduce the pressure and temperature of the flash system, and meet the requirements of the operation of a gray water system.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a pulverized coal gasification flash condensation system and process. Background technique [0002] Pulverized coal gasification is a technology in which coal is converted into synthesis gas and fuel gas through incomplete combustion, and it is one of the important ways to use pulverized coal cleanly. Pulverized coal gasification technology has the advantages of high combustion efficiency and high energy utilization rate, and has gradually replaced the original lump coal combustion. [0003] Generally speaking, the high-temperature and high-pressure syngas generated after pulverized coal gasification is sent to the subsequent transformation process after being quenched by water and washed. In the process of water quenching and washing, gray water with high temperature and high pressure and high solid content is produced. The gray water is decompressed and flashed step by st...

AI Technical Summary

Problems solved by technology

[0005] In order to ensure the heat exchange effect, the conventional heat exchanger has a small gap between the tubes, and is baffled many times by the baffles. The liquid droplets and fly ash entrained in the flash steam are easily deposited in the tubes to form blockages, reducing the heat exchange rate. The thermal effect causes a large amount of flash steam to be unable to be condensed, causing the pressure and temperature of the system to rise, which is not conducive to the subsequent settlement of gray water

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