A coal-to-gas multi-pollutant purification and treatment system

Abstract

The present invention provides a coal-to-gas multi-pollutant purification and treatment system, which is suitable for upgrading, purifying, converting and utilizing crude gas containing miscellaneous gases, which includes a process for upgrading and purifying synthetic gas and a process for multi-channel flexible treatment of incremental waste water; The crude gas containing impurities is removed from the primary effect gas-solid separation device and then enters the waste heat exchanger for waste heat recovery. After heat exchange, the gas enters the gas quality control and improvement module for gas modification and upgrading. The gas is input to the high-efficiency gas purification module for gas-solid separation to further remove dust and colloids in the gas. The invention effectively removes the impurities and harmful substances in the synthetic gas, and at the same time, the removal rate of the harmful water-soluble gas exceeds 90%, reduces the corrosivity of the water body, and can realize the goal of subsequent graded treatment.

Description

technical field [0001] The invention belongs to the technical field of coal gasification environmental protection, and relates to a coal gasification multi-pollutant purification and treatment system, which can be widely used in coal gasification environmental protection treatment technical equipment and processes. Background technique [0002] my country's energy structure is dominated by coal. At present, coal is still the main source of energy in my country, and the clean utilization of coal is bound to become a mid- to long-term trend. The coal-to-gas process is a very good way to cleanly utilize coal. The annual share of coal gas produced by the coal-to-gas process has increased year by year. At present, a large part of the coal-to-gas process adopts the atmospheric pressure coal-to-gas process or the low-pressure coal-to-gas process. [0003] Chinese Patent No. 2019216675753 discloses a fixed-bed coal-to-gas system, which includes a gas furnace body, a furnace cavity i...

AI Technical Summary

Problems solved by technology

However, the traditional process will still produce the following pollution problems in the production process: (1) There are a large amount of water slag with low utilization value; (2) The wastewater treatment volume is large, and the salinity, COD, BOD, ammonia nitrogen, total nitrogen, High content of sulfur and phosphorus; (3) Toxic and harmful gas and aerosol unorganized emissions are obviously visible, audible and measurable

[0008] 1. Generally, coal gas still contains a lot of impurities and harmful gases, and there are relatively large defects in direct use

[0009] 2. Even if the treated wastewater is converted into qualified reclaimed water for discharge, the total amount of discharge is huge and precious fresh water resources are wasted

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