Gas making system and method applied to natural gas made of pithead coal

Abstract

The invention discloses a gas making system applied to natural gas made of pithead coal. The gas making system comprises a screening unit, a fixed bed gasification unit, a high-pressure coal slurry preparation unit and a coal water slurry gasification unit. The invention further discloses a gas making method applied to the natural gas made of the pithead coal. Lump coal and slack coal are utilizedsimultaneously, and the resource utilization rate is increased; and meanwhile, all phenol-and-dust-containing wastewater generated in the fixed bed gasification process is directly used for wet method slurrying without being subjected to any separation operation, pollution sources and the environment can be completely isolated, and the wastewater problem of a fixed bed gasification process is solved thoroughly.

Description

technical field [0001] The disclosure belongs to the field of coal chemical industry, and in particular relates to a gas-making system and method applied to pit mouth coal-to-natural gas. Background technique [0002] Coal-to-natural gas is an important branch of the new coal chemical industry, which has important strategic significance and is also an important development direction of the new coal chemical industry. Coal-to-natural gas includes processes such as gas production, purification, and methanation. Among them, the gas production process of producing syngas by coal gasification is the leading part of the entire process, and it is also one of the restrictive factors of the entire technology. [0003] The synthesis gas obtained by fixed bed gasification technology (such as Lurgi, BGL, etc.) has a high methane content, making it the most suitable gas production process for coal-to-natural gas, and it is also the most used coal-to-natural gas production process at pres...

AI Technical Summary

Problems solved by technology

These gas-water separation processes or filtration, sedimentation and other processes are open operations, and the harmful medium cannot be completely isolated from the surrounding environment. The environmental benefits of the operation process are still relatively poor, and the pressure energy of high-pressure wastewater has not been effectively utilized.

In short, although the above improvements have solved the problem of the utilization of fine coal to a certain extent, the pollution of phenolic and dusty wastewater has not been completely solved.

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