System for producing natural gas by electrolytic hydrogen production and gas synthesis from coal

A coal-to-synthesis gas and natural gas technology, applied in the field of natural gas, to achieve the effects of improving carbon utilization, reducing production load, and reducing investment costs

Inactive Publication Date: 2015-04-22
HUANENG CLEAN ENERGY RES INST +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

Hydrogen production by electrolysis of water has not been applied to coal-to-natural gas production

Method used

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  • System for producing natural gas by electrolytic hydrogen production and gas synthesis from coal

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] Referring to the accompanying drawings, a system for electrolytic hydrogen production and coal-to-synthetic gas to natural gas comprises a coal preparation unit 1, the outlet of the coal preparation unit 1 is connected to the inlet of the gasifier 2, and the crude gas outlet at the upper end of the gasifier 2 is connected to the first The inlet of the first absorption tower 3 is connected, and the outlet of the first absorption tower 3 is divided into two lines, the main line and the auxiliary line. Line 1 is connected to the power plant 7, and the electric energy generated by the power plant 7 through thermoelectricity, wind power, and photovoltaics is directly supplied to the electrolytic water hydrogen production unit 8; the outlet of the lower end of the gasifier 2 is connected to the inlet of the second absorption tower 4, and the second absorption tower ...

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Abstract

The invention relates to a system for producing natural gas by electrolytic hydrogen production and gas synthesis from coal. The system comprises a coal preparation unit, wherein the coal preparation unit is connected with a gasification furnace, a crude coal gas outlet of the gasification furnace is connected with an inlet of a first absorption tower, a main circuit of a first absorption tower outlet is connected with a low temperature methanol washing unit through a conversion unit, an auxiliary circuit of the first absorption tower outlet is connected with a power plant, and the electric energy is directly supplied to an electrolytic water hydrogen production unit; a circulating sewage outlet of the gasification furnace is connected with the electrolytic water hydrogen production unit through a second absorption tower, a hydrogen outlet of the electrolytic water hydrogenation unit is connected with a methanation unit after being combined with a low temperature methanol washing unit outlet, and an oxygen outlet of the electrolytic water hydrogen production unit is connected with a corresponding device. By adopting the system, not only can the requirement of high-purity hydrogen for the reduction of methanation catalyst be met, but also the hydrogen-carbon ratio in the synthesis gas of a conversion working section can be supplemented by adopting the hydrogen with relative high purity, the load produced by the conversion working section in the conventional coal natural gas process can be reduced, and the utilization rate of carbon can be increased.

Description

technical field [0001] The invention belongs to the technical field of natural gas, and in particular relates to a system for producing hydrogen by electrolysis and coal-to-synthesis gas to produce natural gas. Background technique [0002] In the existing coal-to-natural gas production, the crude gas after coal gasification must be adjusted through the conversion section to adjust the hydrogen-carbon ratio, which will convert a large amount of carbon monoxide into carbon dioxide, reducing the effective utilization of carbon, and also increasing the downstream low-temperature methanol washing. Unit load, resulting in a waste of energy. [0003] The coal-to-natural gas process will produce a large amount of industrial sewage, and the unrestricted discharge will not only pollute the environment, but also cause a lot of waste of water resources; at the same time, a large amount of process heat energy will be generated in the production process. Many factories choose to directly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 王晓龙何忠郜时旺肖天存许世森
Owner HUANENG CLEAN ENERGY RES INST
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