Double-bed gasification unit and method

Abstract

The invention relates to a double-bed gasification device, which includes: a pyrolysis furnace, a gasification furnace and a pyrolysis gas condensation separator, and re-adds the difficult-to-use low-quality tar produced by pyrolysis into the high-temperature gasification furnace to generate synthetic gas Or water gas, and reduce the tar component in the generated synthetic gas or water gas, improve the gas quality, reduce the amount of pollutants in the gas, and reduce the difficulty of subsequent gas treatment. At the same time, after the pyrolysis gas is cooled and liquefied, only the liquefied tar enters the gasifier again for re-gasification, and the pyrolysis coal gas of hydrocarbon-rich substances that cannot be gasified no longer participates in the gasification but directly interacts with the generated The mixed gas and water gas are mixed to form a mixture, thereby reducing the damage to the hydrocarbons in the pyrolysis gas, and these hydrocarbon-rich substances are transferred to the mixed gas, which greatly improves the calorific value and quality of the gas.

Description

technical field [0001] The invention belongs to the technical field of gasification, and in particular relates to a double-bed gasification device and method. Background technique [0002] The twin-bed gasification technology generally pyrolyzes the solid fuel first, and then sends the pyrolysis product into the gasifier for gasification to obtain synthetic gas or water gas, which can effectively reduce the content of impurities such as tar in the produced synthetic gas. It improves the gas quality, reduces the emission of pollutants such as phenol water, and increases the calorific value of the produced synthetic gas. It is a very important gasification technology, especially suitable for the low-quality tar produced by low-rank coal pyrolysis. In difficult-to-use working conditions, low-quality tar can be effectively gasified and reused. [0003] At present, the traditional twin-bed gasification technology generally sends the pyrolysis gas produced after pyrolysis directl...

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Problems solved by technology

[0003] At present, the traditional twin-bed gasification technology generally sends the pyrolysis gas generated after pyrolysis directly into the gasifier to be cracked and gasified again at high temperature, so as to obtain synthetic gas or water gas with lower impurities and higher calorific value. This type of technology is relatively simple, with high thermal efficiency and high cold gas efficiency, but it directly converts substances with high calorific value such as hydrocarbons or low-boiling aromatic ring substances in the pyrolysis gas into hydrogen and Substances such as carbon monoxide reduce the content of organic substances with high calorific value in the gas, making it difficult to greatly increase the calorific value of the gas

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