A method for treating phenolic water in a coal gasifier

Abstract

The invention provides a treatment method for phenolic water produced by a gas producer. According to the method, lower-segment high temperature gas of the gas producer heats and evaporates water so as to obtain high temperature steam, and the high temperature steam is used as an intermediate heat-transferring medium for heating air, thereby recovering heat in the high temperature gas; and a part of the produced high temperature steam atomizes phenolic water into tiny droplets through a steam atomizing nozzle, atomized phenolic water and the high temperature steam are used as a gasifying agent together and sent to the gas producer, and phenolic water is completely decomposed after burning at a high temperature of more than 1100 DEG C, producing no secondary pollution. Since the method adopts waste heat of the high temperature gas produced by the gas producer, no energy is consumed except a small amount of electric energy needed by a water pump, so operation cost is low, low temperature steam produced in the jacket of the gas producer can be recovered, and steam with higher pressure and temperature can be produced, which is more beneficial for utilization of steam.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to the treatment of phenolic water produced by a gas generator. Background technique [0002] As an industrial raw material or industrial gas, coal gas is widely used in chemical industry, building materials, steel and other industries. It uses water vapor to pass through the hot coal seam and react with high-temperature coke to produce gas. Its main components are carbon monoxide and hydrogen. And a small amount of components such as carbon dioxide, nitrogen and methane. In the process of gas production, pollutants such as hydrogen sulfide, tar, and phenol water will be produced. Among them, phenol water is a pollutant with complex components, which is mainly composed of phenols, sulfides, and cyanides. The discharge of phenol water seriously affects the environment and human life and health. As the country's environmental protection requirements become more and more stri...

AI Technical Summary

Problems solved by technology

The evaporation treatment method is to use an evaporator to heat and vaporize the phenol water, and then process the phenol water after shrinking. This method has the advantages of easy corrosion of the evaporator, easy fouling inside the evaporator, high treatment cost, and incomplete treatment of the phenol water. Disadvantages; and the incineration treatment method is to spray phenolic sewage into the incinerator, so that the phenolic organic matter will undergo oxidation reaction at a high temperature of about 1100 ° C, and finally generate CO 2 and H 2 O emission, many gasifiers currently in operation are equipped with special incinerator facilities. This method is simple in process and easy to operate, but it requires large investment and high energy consumption.

For the method of directly spraying phenol water into the gasifier for phenol water incineration, the sprayed phenol water not only has an adverse effect on the operation of the gasifier, but also uses the phenol water in the furnace due to the evaporation of the phenol water. Effective heat, which leads to an increase in energy consumption

According to the published data, no matter whether the physical chemical method or the biochemical method is used above, there are disadvantages such as large equipment investment, high energy consumption, and high operating cost.

[0004] In addition, in order to improve the thermal efficiency of the gasifier, some gasifiers use partition-type heat exchange equipment to transfer the heat of the high-temperature gas to the air, so as to increase the temperature of the air entering the furnace and achieve the purpose of waste heat recovery. The problems caused by this method If the heat exchange equipment leaks due to corrosion or other reasons during operation, the gas may be mixed with the air, which may cause the risk of gas explosion

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