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

Abstract

The invention relates to a fixed-bed pure-oxygen continuous gasification device and process adaptable to diversified coals. According to the device and the process, CO2, pure oxygen and superheated steam serve as gasifying agents and subject to a gasification reaction with feed coal in a fixed-bed pure-oxygen continuous gasifier, so as to generate gasified coal gas; the gasified coal gas enters a dust remover so as to remove solid particles from the gasified coal gas, and a water cooler is arranged at the upper part of the efficient dust remover and is used for recovering part of sensible heat from the gasified coal gas; the gasified coal gas subjected to dust removal enters a heat-pipe heat exchanger for heat recovery, and low-pressure steam is a byproduct; and low-temperature gasified coal gas enters a low-pressure coal gas scrubbing tower for final cooling and dust removal, and scrubbed water gas is connected and conveyed to a gas tank. The content of CO and H2 in the gasified coal gas can reach 80% or more, the ratio range of adjustment of CO among ingredients of the coal gas is 40-65%, the ratio range of adjustment of H2 among the ingredients of the coal gas is 5-40%, and the gasified coal gas can serve as raw material gas of a variety of chemical products through being subjected to further deep treatment by processes such as conversion and purification.

Description

technical field [0001] The invention belongs to the technical field of coal gasification, and in particular relates to a fixed-bed pure oxygen continuous gasification device and 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, the conversio...

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Problems solved by technology

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 applicable to the production of carbon monoxide, if hydrogen is required, the conversion of raw material gas is also required

[0003] At present, my country's normal-pressure gasification process is mainly based on anthracite, including lump coal and molded coal. Due to technological defects, the effective conversion rate of carbon in coal is low, and the content of residual carbon in ash after gasification is relatively low. High, generally between 8-15%, the residual carbon content in the ash will be higher when the process fluctuates

[0004] At present, any gasification process will be accompanied by CO 2 For the generation of gas, the current process is separated and processed in the post-process or recycled to another device, or discharged into the atmosphere, causing environmental pollution and energy waste

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