Coal gas cycle coal pyrolysis coupled chemical chain gasification system for co-production of oil and gas

Abstract

The invention provides a system for coal gas circulation coal pyrolysis coupled chemical chain gasification to co-produce oil and gas. The system includes a raw coal pretreatment system, a coal pyrolysis system, a coal coke chemical chain gasification system and an oxygen carrier air regeneration system. The chemical looping gasification unit uses pyrolysis semi-coke as the raw material, oxygen carrier lattice oxygen as the oxygen source, and reacts to obtain synthesis gas and reduced oxygen carrier; the pyrolysis unit uses a fluidized bed as the pyrolysis reactor, and the gas-solid two The phase heat carrier is the heat source. After heat exchange between the pyrolysis gas and the high-temperature gasification synthesis gas, it circulates as a gas heat carrier. At the same time, the reduced oxygen carrier with a certain catalytic effect acts as a solid heat carrier to supplement heat; the reduced state separated by magnetic separation The oxygen carrier enters the air regeneration reactor and is regenerated to an oxidized state. The present invention uses coal as a raw material, and through the oxygen-carrying, catalytic and heat-carrying capacity of the oxygen carrier, coal pyrolysis and chemical chain gasification are coupled to produce tar and synthesis gas at the same time, realizing the cascade utilization of coal, with high carbon conversion rate, The system has the advantages of low energy consumption and environmental friendliness.

Description

technical field [0001] The invention relates to a process system for cascade conversion of coal and co-production of tar and synthetic gas, which can be used in the field of clean and efficient utilization of coal, and particularly relates to coal dry distillation, tar catalytic reforming, and chemical chain co-production of oil and gas systems. Background technique [0002] As the fossil raw material with the most abundant reserves in China, it occupies a dominant position in my country's primary energy consumption structure. However, there are still a series of problems such as environmental pollution and low utilization efficiency in the development and utilization of coal resources in our country. How to solve the problem of sustainable development of coal resources is imminent. In view of the current situation of my country's utilization of coal energy, improving the traditional utilization of coal resources, improving utilization efficiency, reducing environmental pol...

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Problems solved by technology

[0006] The problem to be solved by the present invention is to solve the limitations of existing coal pyrolysis and coal gasification technologies, and propose a system and method for coal gas circulation coal pyrolysis coupling chemical chain gasification and co-production of oil and gas. The system is based on coal pyrolysis technology in the production of high At the same time as value-added chemicals, pyrolysis semi-coke is used as a solid fuel for chemical loop gasification to produce syngas products, which can solve the problems caused by the high cost of coal gasification technology and the tar produced in the process of coal chemical loop gasification In order to solve problems such as blockage and oxygen carrier coking, coal cascade utilization can also be realized. At the same time, the temperature gradient of each reaction unit can be used to realize efficient energy transfer and improve energy utilization efficiency through the circulation of oxygen carrier and gas heat exchange.

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