Coal catalytic gasification method and coal catalytic gasification device

Abstract

The invention discloses a coal catalytic gasification method and a coal catalytic gasification device, and relates to the technical field of coal catalysis in order to improve the yield of methane. The coal catalytic gasification method comprises the following steps: returning carbon monoxide, hydrogen and a catalyst separated after catalytic gasification of coal into an anaerobic zone of the gasification device, and carrying out a methanation reaction. The coal catalytic gasification method is used to increase the methane yield of the coal catalytic gasification device.

Description

technical field [0001] The invention relates to the technical field of coal catalysis, in particular to a coal catalytic gasification method and a coal catalytic gasification device. Background technique [0002] Coal catalytic gasification technology is an important way of clean and efficient utilization of coal, and it is one of the most efficient gasification technologies for coal-to-natural gas. Coal catalytic gasification technology reacts coal under mild conditions to generate methane-rich synthesis gas at temperature (650-750°C) and pressure (3.0-4.5MPa), which improves energy utilization efficiency. [0003] In the existing coal catalytic gasification technology, gasification agents such as water vapor, hydrogen, and carbon monoxide are introduced into the catalytic gasification device through the bottom distribution plate of the catalytic gasification device, and carbon water, water gas conversion, and methanation reactions occur in the device, and the output includ...

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Problems solved by technology

[0003] In the existing coal catalytic gasification technology, gasification agents such as water vapor, hydrogen, and carbon monoxide are introduced into the catalytic gasification device through the bottom distribution plate of the catalytic gasification device, and carbon water, water gas conversion, and methanation reactions occur in the device, and the output includes methane, Crude gas such as hydrogen, carbon monoxide, carbon dioxide, water vapor, etc., after purification and separation, water vapor and carbon dioxide are removed to obtain gas containing methane, hydrogen, and carbon monoxide, and then the product methane is separated by a cryogenic separator, and the separated carbon monoxide and hydrogen The distribution plate at the bottom of the catalytic gasification device meets the water vapor gasification agent and returns to the gasification device for methanation reaction. The carbon monoxide and hydrogen returned from the catalytic gasification device enter the catalytic gasification device from the bottom and contact with oxygen to cause secondary combustion. thereby reducing the methane production rate of the unit

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