Coupling technology adopting lignite-gasification gas production and dry distillation upgrading

Abstract

The invention provides a coupling technology adopting lignite-gasification gas production and dry distillation upgrading. A coal gasification device and a coal-produced semi-coke dry distillation device are connected in series for use, high-temperature synthesis gas produced from coal after gasification in a gasification furnace directly enters a dry distillation furnace, is taken as a dry distillation heat-carrying gas and is sufficiently contacted with the coal in the dry distillation furnace, H2O and CO2 in the synthesis gas are contacted with a hot carbon material for further reaction, effective gas composition in the synthesis gas is increased, and a semi-coke product, coal tar and dry distillation gas are obtained through pyrolysis and dry distillation upgrading of the coal. The semi-coke product is collected from the bottom of the dry distillation furnace, a mixture of the coal tar, the dry distillation gas and the synthesis gas is collected from the top of the dry distillation furnace, and a coal tar product and a synthesis gas product are obtained through cooling separation. Compared with a simple lignite-gasification gas production technology, the effective gas composition of the produced synthesis gas is higher, the CO2 emission proportion of a traditional coal gasification technology can be reduced, the heat of the whole technological procedure is sufficiently utilized, additional heat input is not required for semi-coke production through dry distillation of the coal, and the energy utilization efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, in particular to a coupling process of lignite gasification gas production and dry distillation upgrading. Background technique [0002] Semi-coke, commonly known as semi-coke, is generally a solid product obtained by low-temperature dry distillation of peat, lignite and high-volatile bituminous coal. After more than ten years of development in China, the semi-coke industry has formed a coal dry distillation-based, including metal magnesium, Industrial chains of high-energy-carrying industries such as ferroalloys, fertilizers, calcium carbide and power generation. However, the organizational structure of the semi-coke industry is relatively low, the layout of enterprises is scattered, and there is a lack of comprehensive utilization of synchronous supporting resources. [0003] In recent years, my country's coal chemical industry has developed rapidly, and high-quality resources s...

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Problems solved by technology

However, coal gasification requires a gasifier system with two operating conditions, which need to produce normal temperature gasification gas and high temperature coal gas respectively, and the system configuration is more complicated

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