Method and equipment for producing gas by coke gasification

Abstract

The invention discloses a method for producing gas by coke gasification. According to the method, oily dust crude gas enters a cyclone separator to be separated to obtain crude gas of which the oily dust content is 1 to 80 mg per cubic meter and oily dust; the oily dust is enriched to the bottom of the cyclone separator, an ash tank is pressurized by using the gas or an inert gas until the pressure of the ash tank is consistent with that of the cyclone separator, and an oily dust discharge valve is opened for discharging the oily dust to the ash tank; the obtained crude gas enters an integrated waste heat recovery device, heat is recovered in grades through a superheater, a heat recovery device II and a heat recovery device I, and the recovered heat generates three-grade steam of low-pressure saturated steam, medium-pressure saturated steam and superheated steam. The method and equipment for producing the gas by the coke gasification disclosed by the invention have the advantages of no gas scouring water and capabilities of carrying out grading recovery and reutilization on gas waste heat energy and further producing the steam of different grades.

Description

technical field [0001] The invention belongs to a method and equipment for producing coal gas by coke gasification. Background technique [0002] Crushed coal pressurized gasifier is a fixed bed coal gasifier, due to the low requirements for raw coal, that is, except for strong caking coal, other coal types can be gasified, especially low-rank coal and high ash melting point Low-quality coal and gasification coke. The gasifier is widely used in coal-to-synthetic ammonia, methanol, dimethyl ether, synthetic oil and coal gas. However, the crushed coal pressurized gasification technology used in the crushed coal pressurized gasification process currently in industrial operation is suitable for gasifying coal with carbonization and drying layers. During the gasification process, heat is absorbed during drying and carbonization, and the temperature at the top of the gasifier It will not exceed the withstand temperature of the gasifier material. In addition, the reactivity of co...

AI Technical Summary

Problems solved by technology

With the rapid development of my country's industry, chemical equipment is gradually developing towards high temperature, high pressure, and large-scale development. In particular, coal gasification technology requires a gasification pressure of at least 40 kg, and a daily coal input of 1,000 tons. The reserves of high-quality coal are decreasing, but the proportion of low-quality coal is gradually increasing, especially the proportion of coal with ash melting point greater than 1500 degrees is gradually increasing, which makes the temperature and pressure of gasification gas or subsequent exhaust gas increase accordingly. Patent Name: A high-temperature and high-pressure waste heat boiler, application number: 201110462710.2 The patent solves the problem of high pressure and high temperature, but the heat recovery process and equipment we currently use for fixed-bed gasification: Modern Coal Chemical Technology Manual 2nd Edition, pages 424 to 428 The typical fixed-bed gasification process in Introduction 5 is one-stage heat recovery, which produces one-grade steam. The temperature of the coke gasification gas is high, and the use of the original process not only causes waste of resources, but also pollutes the environment

Patent name: Waste heat boiler for pressurized gas, application number: 200510010273.5 The patent is mainly used to solve the gasification of pulverized coal and improve the efficiency of heat recovery, but it is still a first-level heat recovery, which produces a single-level steam and fails to fully recover waste heat use

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