Three-waste processing method and system in coal-to-gas technology of fixed bed

Abstract

The invention discloses a three-waste processing method in a coal-to-gas technology of a fixed bed. A traditional gas-water separation device is replaced with a gas-solid separation device, and therefore a cooling tower and a waste water processing pool huge in occupied area in a traditional process are omitted, the construction cost of a system is reduced, the use cost of a large amount of waterresources and the purification processing cost of waste water are saved, and therefore the use and maintenance cost of the system is reduced; extremely high economy is realized compared with the traditional process, the production cost of a coal chemical industry enterprise is greatly reduced, people are more willing to use the system, and extremely good market prospects are realized.

Description

technical field [0001] The invention relates to a method and system for treating three wastes in a fixed-bed coal-to-gas process, belonging to the technical field of environmental protection. Background technique [0002] The current common fixed bed coal gasification production process is as follows: figure 1 As shown, the lump coal is incompletely combusted in the oxygen-poor environment of the gasifier, and the crude gas is formed under the comprehensive reaction of coal, oxygen and steam, and the accompanying substances generated by the low-temperature (900°C) reaction, including (ammonia nitrogen, phenol, Volatile phenol, petroleum, sulfide, cyanide, SS, etc.), crude gas is discharged from the top of the gasifier, recovered by waste heat boiler waste heat, and then washed by a water washing tower to form semi-finished water gas. [0003] The washing wastewater discharged after being cooled and washed by the water washing tower contains a large amount of particulate mat...

AI Technical Summary

Problems solved by technology

[0007] (1) The composition of wastewater is complex, the concentration of pollutants is high, and the corresponding treatment load requirements are high

[0008] (2) Wastewater contains phenol, cyanide, and ammonia substances, which are highly toxic and will inhibit microbial activity

[0009] (3) The biodegradability of wastewater is poor, and the BOD / COD ratio is usually lower than 0.3, which is not easy to biodegrade

[0010] (4) The wastewater treatment site is large, the cost is high, and the investment is large

[0011] (5) The processing equipment and pipelines are severely corroded, resulting in poor production environment

[0012] (6) The water consumption required for the treatment of the three wastes is large

And frequent replacement of filter media will inevitably interrupt production. For enterprises, the cost of replacing filter media and economic losses caused by interrupted production are difficult to bear.

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