Device and method for comprehensive utilization of coal chemical gasification black water waste heat and pressure

Abstract

The invention relates to the technical field of coal chemical gasification black water waste heat and pressure recycling, in particular to a device and method for comprehensive utilization of coal chemical gasification black water waste heat and pressure, and the device and method are applicable to Texaco, aerospace furnaces and other gasification black water treatment processes in coal chemical industry. Chilling water from a gasification furnace and washing water from a carbon washing tower enter a pressure equalizing box by means of corresponding pipelines and valves to balance and expand the pressure and temperature of the two streams black water, then enter the tooth space volume of a screw expander and drive a rotor to do work by expansion, and the screw expander is in coupled connection with a high voltage asynchronous generator through a gear box, thereby realizing comprehensive utilization of gasification black water waste pressure. The device and the method provided by the invention have the characteristics of high efficiency, energy saving and convenient operation, and can apply the recovered energy to a production system where the gasification device is located, thus having obvious economic and social benefits.

Description

technical field [0001] The patent of the present invention relates to the technical field of recovery and utilization of waste heat and pressure of coal chemical gasification black water, especially relates to a device and method for comprehensive utilization of coal chemical gasification black water waste heat and pressure, which is suitable for coal chemical industry Texaco, aerospace furnace and other gas Black water treatment process. Background technique [0002] At present, in order to meet the conditions of use in subsequent working conditions, coal chemical gasification uses water for cooling and washing. The gasification process continuously produces black water with high pressure and a certain amount of heat. Vacuum flash evaporation lowers the temperature and pressure of the black water, precipitates and removes coal ash in the black water and then recycles it. [0003] The post-gasification process of the coal chemical industry usually has a chilling process and...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a device and method for the comprehensive utilization of waste heat and pressure of coal chemical gasification black water, aiming at reusing energy and black water treatment systems that cannot be recovered and solved, such as waste steam, black water waste heat, and waste pressure generated by the gasification device Scaling, large amount of discharged sewage, etc., the device and method for comprehensive utilization of black water waste heat and pressure in coal chemical gasification can realize the cycle cascade utilization of the secondary energy of the gasification device and the "zero discharge of sewage" in coal chemical gasification, The waste energy in the chemical project area can be effectively utilized, and the scaling problem of the subsequent low-pressure black water system can also be solved. It is especially suitable for the comprehensive utilization of waste heat and pressure in the gasification chilling process, and has the advantages of high efficiency, energy saving and convenient operation. Features, the recovered energy can be used in the production system where the gasification device is located, which has obvious economic and social benefits

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