Process and system for recycling phenol water in coal gas producer by gasifying and feeding phenol water into furnace

Abstract

The invention discloses a process and a system for recycling phenol water in a coal gas producer by vaporizing and feeding the phenol water in the coal gas producer into a furnace. Saturated steam generated by vaporizing and cooling the coal gas producer exchanges heat with coal gas waste heat of a cyclone dust collector in a superheater and becomes superheated steam after being heated; the superheated steam enters a steam injection desuperheater to serve as an injection source, negative pressure is generated in the injection process to suck phenol water and vaporize the phenol water, and mixed vaporized liquid is formed; and the mixed vaporizing liquid is fed into a vaporizing agent inlet of the gas producer. According to the invention, phenol water with high turbidity and more impurities is mixed and vaporized with superheated steam through the steam temperature and pressure reducer instead of being vaporized in the cyclone dust collector, so that the problems of scaling, blockage and corrosion of the cyclone dust collector caused by direct entering of the phenol water into the cyclone dust collector are avoided; the waste heat of the coal gas is utilized, so that the consumption of cooling water for rear coal gas cooling treatment is reduced, and innovation and breakthrough of a phenol water treatment process and system are realized; the method has the characteristics of low investment, reliable process, high complementary energy utilization rate, long service life of equipment and the like.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, in particular to a process and a system for reusing phenol water in a gas generator by vaporizing it into the furnace. Background technique [0002] The gas generator will produce waste water containing phenol and benzene, referred to as phenol water; the treatment of phenol water has been a problem that has plagued the industry for many years, and the pressure on environmental protection is enormous. At present, there are only two methods for treating phenolic water in the industry: one is to build an incinerator to make it a harmless product after high-temperature combustion and cracking; the other is to use the waste heat of a cyclone to vaporize it into saturated steam, which is used as a gasifying agent in the furnace and cracked into non-toxic products. Harmful goods. However, these two methods have serious defects; the incinerator is burned at high temperature and sprayed with phenol...

AI Technical Summary

Problems solved by technology

But these two methods have serious defects; incinerator high-temperature combustion sprays phenol water to make it pyrolyze to achieve harmless treatment, because it must use the producer gas produced by the producer itself or introduce blast furnace gas and converter gas as incineration Incinerator fuel consumes a lot of energy, high operating costs, and a large investment, which is uneconomical in terms of economy and cost; and the incinerator is actually a steam-generating boiler, phenol water is directly sprayed into the furnace, and the drum, body pipes, The service life of coal burner etc. is under high temperature and corrosion environment for a long time.

Using cyclone dust collector to vaporize phenolic water will make the dust collector easy to scale and block, and it cannot be cleaned effectively, and the corrosion of the vaporized interlayer of the cyclone dust collector will gradually increase during the heating process of the phenolic water, and the service life of the dust collector and the vaporized interlayer will be greatly reduced and threaten the equipment. Safe operation; At present, almost all enterprises using this phenolic water treatment method have been shut down

That is to say, at present, there is still no good process and system for the phenol water treatment of gasifier in China.

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