Method for coal hydrogenation pyrolysis and gasification coupling

Abstract

The invention discloses a method for coal hydrogenation pyrolysis and gasification coupling, comprising the steps of: drying and preheating raw material coal with granularity less than or equal to 2mm in a coal drying and preheating system; putting 60-80% of the dried and preheated raw material coal in a coal hydrogenation pyrolysis furnace to carry out coal hydrogenation pyrolysis; putting a pyrolyzed gas-phase product in a pyrolyzed gas purification and separation system to carry out separation; putting all the semicoke generated by the coal hydrogenation pyrolysis furnace in a coke hydrogenation gasification furnace to carry out hydrogenation gasification; putting a gasified gas-phase product in a gasified gas purification and separation system; and causing 20-40% of the dried and preheated raw material coal and high-temperature coke granules from the coke hydrogenation gasification furnace to enter a hydrogen-rich generator from upper and lower paths under the combined action of oxygen and a water vapor mixed gasification agent so as to carry out gasification reaction. The coal hydrogenation pyrolysis, semicoke hydrogenation gasification and coke granule hydrogen production are combined; therefore, the tar yield and the light component content are effectively improved and methane-rich pyrolyzed gas, gasified gas and coal chemical products such as naphthalene, benzene, phenol and the like with high added value can be obtained.

Description

technical field [0001] The invention relates to a comprehensive utilization technology of coal resources, in particular to a method for coupling coal hydropyrolysis and gasification. Background technique [0002] In the 21st century, with the rapid economic growth, the demand for chemical raw materials has also increased sharply. In the structure of chemical raw materials, coal accounts for more than half. consensus. In order to realize the graded and efficient utilization of coal resources, the academic community has proposed a process idea of ​​"coal topping", which fully extracts gases, liquid fuels and fine chemicals from coal. [0003] In the existing technology, the tar yield of coal pyrolysis technology is low, and the content of light components is small; the rapid hydropyrolysis technology of coal can increase the tar yield and obtain methane-rich high calorific value gas at the same time, but the raw coal Some of the carbon still exists in the form of low-value-a...

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Problems solved by technology

[0003] In the existing technology, the tar yield of coal pyrolysis technology is low, and the content of light components is small; the rapid hydropyrolysis technology of coal can increase the tar yield and obtain methane-rich high calorific value gas at the same time, but the raw coal Some carbon still exists in the form of low-value-added semi-coke, and the total carbon utilization rate of raw materials is low

Coal gasification technology can obtain syngas with different gas components by selecting different gasification agents, but as far as the specific gasification medium is concerned, its syngas components are relatively single, and at the same time, it is impossible to extract naphthalene, benzene, phenol, etc. valuable coal chemical products

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