Technology for producing cooled coal gas with no discharge of phenolic water

Abstract

The invention relates to a technology for producing cooled coal gas with no discharging of phenolic water, belonging to the technical field of coal gas production and providing a technology for producing cooled coal gas with no discharging of phenolic water which has no contamination of the environment and can save energy and investment. The process flow of a single stage coal gas producer is as follows: the hot coal gas enters a ceramic filter deduster from the outlet of the coal gas producer; then enters an indirect cooling device to carry out heat exchange with phenolic water and the temperature drops to 40-50 DEG C; the cooled coal gas enters an electro detarrer to remove tar oil and small dust particles; the purified coal gas is supplied to users through a coal gas compresser; the phenolic water is heated into phenolic vapor and is used as gasification agent after being introduced into the bottom of the coal gas producer. The process flow of a two-stage coal gas producer is as follows: the lower-stage gas emerges out of the coal gas producer and passes through the ceramic filter deduster and the indirect cooling device; the upper-stage coal gas emerges, enters a rough electrical coke arrester and a refined electrical coke arrester, and is converged with the lower-stage coal gas to obtain purified coal gas, thus optimizing the dedusting and heat exchanging processes of hotcoal gas, improving dedusting effect and hot exchange efficiency, being capable of saving investment of devices, protecting environmental and saving energy.

Description

technical field [0001] The invention relates to a process for producing cold gas, belonging to the technical field of gas production. Background technique [0002] In the traditional cold gas production process, there are two production processes of single-stage gasifier and two-stage gasifier, both of which have obvious deficiencies. [0003] From the perspective of the traditional single-stage gasifier process, the crude hot gas produced by the single-stage gasifier first enters the double vertical pipe and is cooled and washed by circulating water, then enters the scrubber, and enters the electrostatic precipitator through the isolation water seal to catch tar. And dust, and then enter the drop catcher through the isolation water seal to remove the moisture contained in the gas, and finally pressurize it through the gas pressurizer, and transport it to the user through the pipeline. Since the gas is in direct contact with water in the double vertical pipes, washing tower...

AI Technical Summary

Problems solved by technology

In the above process, in order to reduce the temperature of the gas, the system adopts three heat exchange equipments: waste heat boiler, air cooler and intercooler. This is because the actual dust removal efficiency of the cyclone dust collector is only about 30%. There is still a lot of dust. If the gas circulation channel of the heat exchange equipment is small or complicated, it will inevitably lead to blockage. Therefore, most enterprises use heat exchangers in the form of bare tubes, and the heat transfer effect of bare tubes is very poor. They only rely on increasing heat transfer. area to realize the transfer of heat, which makes the gas cooling system so large

On the other hand, the circulating water of the cooling medium in the heat exchanger absorbs the heat of the hot gas, and only a small amount of steam generated in the waste heat boiler is used. device, this process causes a waste of energy and increases the cooling pool

[0005] To sum up, the traditional single-stage gasifier and the two-stage gasifier for producing cold gas do not meet the requirements of environmental protection and energy saving, and it is necessary to improve them

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