A pressurized fixed-bed pure oxygen continuous gasification device and process suitable for various coal qualities

Abstract

The invention relates to a pressurized fixed bed pure oxygen continuous gasification device and process adaptive to various coal quality. The pressurized fixed bed pure oxygen continuous gasification device and process is characterized in that CO2, pure oxygen and superheated steam are used as gasification agents, and gasification reaction of the gasification agents and raw material coal occurs in a fixed bed pure oxygen continuous gasification furnace to generate gasification coal gas; the gasification coal gas enters a dust remover, the solid particles in the gasification coal gas are removed, and a water cooling device is arranged on the upper portion of the efficient dust remover and used for recycling part of sensible heat of the gasification coal gas; the gasification coal gas enters a heat-pipe heat exchanger after the dust removing to perform heat recycling, and low-pressure steam is produced as the byproduct; the low-temperature gasification coal gas enters a low-pressure coal gas washing tower, final cooling and dust removing are performed, the washed water gas is directly sent to downstream users, and gasometers are not needed. The CO and H2 contents in the gasification coal gas can reach above 80%, the proportion adjusting range of the CO in the coal gas is 40-65%, the proportion adjusting range of the H2 is 5-40%, and raw material gas which can be used as various chemical products can be obtained through further treatment by processes such as transformation and purification.

Description

technical field [0001] The invention belongs to the technical field of coal gasification, and in particular relates to a pressurized fixed-bed pure oxygen continuous gasification device and a process suitable for various coal qualities. Background technique [0002] At present, the existing pure oxygen continuous gasification process generally uses secondary metallurgical coke, carbon dioxide, and pure oxygen as gasification raw materials. 70%, CO 2 : 28~29%, H 2 +N 2 : 1~1.2%), and then purified and transformed to prepare qualified syngas synthesis related downstream products. However, the requirements for raw materials used in this process are quite high (about 1% volatile matter, about 82.5% fixed carbon, and the national secondary coke standard), and the cost is also high (the market price of secondary coke is 1800-2000 yuan / ton, while low-rank coal Inland 500-700 yuan / ton), this process is only suitable for the production of carbon monoxide, if hydrogen is required,...

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Problems solved by technology

[0005] At present, the existing gasification technologies include atmospheric pressure gasification and pressurized gasification, and there is no pressurized gasification technology matching the existing synthetic ammonia and methanol industry. The energy consumption of the basic chemical industry of synthetic ammonia and methanol has remained high

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