SU1188193A1 - Method of final cooling of coke gas - Google Patents

Abstract

A METHOD FOR THE FINAL COOLING OF COKE GAS, including contacting cooling water in two stages with watering for irrigation cycles with technical water and trapping hydrogen sulfide and hydrogen cyanide between the final cooling stages, characterized in that, in order to reduce the loss of chemical products from the coking product, the cooling water of the first stage is reduced produced by technical water, pretreated with coke oven gas in a volume ratio of 1: 1800-2000. S (rt

Description

eo

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The invention relates to the processing of coke oven gas and can be used in coke production. The purpose of the invention is to reduce the loss of chemical products of coking. 100 thousand m / h of coke gas with temperature is directed to the first stage final cooler, where it is cooled to. The gas is cooled by circulating water, the flow rate of which is 610. The cooled coke oven gas is then directed to a desulfurization process in a known manner, where it is heated to 4 lc and then to the second-stage final cooler. Here the gas is cooled. to 22 ° C by circulating process water, the flow rate of which is 300 m3 / h. The cooled coke oven gas is then transferred to the benzene department, after which a part of 57,000 is used to process 30 process water, which corresponds to the water-to-volume ratio. - 1 : 1900 Then, the gas after treatment with technical water is mixed with the remaining volume of coke oven gas and sent to the consumer. The process water treated in this way with a COD of 300-400 mg is transferred to feed the cycle of the first stage of the final cooling of the coke oven gas. The indicated amount of water replenishes the losses in the system, which consist of water losses for evaporation into coke oven gas (2 m / h) and for refreshment of circulating water by discharging it into sewage (28 m / h). The contamination of the discharged water is characterized by a COD value equal to. 524 mg Oj / l. In the coke oven gas after the first stage, cooling, the concentration of substances such as cyanides and hydrogen sulfide increases by 0.084 and 0.05 g / m, respectively. The results of similar experiments carried out at different ratios of treated process water to reverse coke gas are shown in the table.

Indicators

The amount of hydrogen sulfide in process water treated with gas, kg / h

Loss of hydrogen sulfide coke gas in the first stage of final cooling, kg / h

The total amount of hydrogen sulfide lost at the first stage of cooling with discharged water into the sewer system, kg / h

The amount of cyanide in process water treated with gas, kg / h

1.5

1.5

1.5

0.0

0.0

0.10

1.50

1.50

1.60

2.6

2.6

2.6 Ratio of treated process water to reverse, coke oven gas

The loss of coke gas cyanide at the first stage of course cooling, kg / h

The total amount of cyanides lost in the first stage of cooling with discharged water into the sewage system, kg / h

The value of COD, discharged water, mg / l

Salt content

Shkirkuliruyuschey

water mg

Table continuation

0.0

0.0

0.09

2.6

2.69

2.6

524

520

520

710

700

700

Claims (1)

METHOD FOR FINAL COOLING OF COKE GAS, including contacting with cooling water in two stages with replenishment of irrigation cycles with industrial water and trapping of hydrogen sulfide and hydrogen cyanide between the stages of final cooling, characterized in that, in order to reduce losses of coking chemical products, replenishment of cooling water. produced by industrial water pre-treated with reverse coke oven gas in a volume ratio of 1: 1800-2000. (L