Indirect gasification device and method for solid fuel

Abstract

The invention relates to an indirect gasification unit solid fuel and method for separating gasification and combustion processes of solid fuel, gasification products with high quality can be got through gasifying solid fuel by the method, a circulating fluidized bed and a spout-fluid bed are kept communicated through an external separator and a refeed line, bed materials in the circulating fluidized bed, the spout-fluid bed and the external separator are high-temperature inert heat carrier particles, solid fuel, gasification medium and high-temperature inert heat carrier particle are mixed in the spout-fluid bed, solid fuel is pyrolized and gasified, residual coke particles and inert heat carrier particle of gasification reaction flow into a circulating fluidized bed through the external separator and the refeed line, coke particles and air/oxygen are combusted in the circulating fluidized bed, inert heat carrier particle is heated up, high-temperature inert heat carrier particle which is heated up returns to the spout-fluid bed after separating by a whirlwind separator, which provides heating source for pyrolysis and gasification of solid fuel.

Description

technical field [0001] The invention relates to a solid fuel gasification device and method, especially an indirect solid fuel gasification device and method. Background technique [0002] Solid fuel gasification is one of the main ways to realize efficient and clean utilization of solid fuel. The existing solid fuel gasification method mainly realizes the gasification process of solid fuel through partial combustion with air or oxygen in a single reactor. Air is used as the gasification agent, and the solid fuel is partially burned in the gasification reactor. Combustion and gasification, the heat required for solid fuel gasification is provided by the combustion process, resulting in the mixing of flue gas produced by combustion into the gasification products, which significantly reduces the quality of solid fuel gasification products; using pure oxygen as the gasification medium can Significantly increase the calorific value of solid fuel gasification products, but it ne...

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Problems solved by technology

The existing solid fuel gasification method mainly realizes the gasification process of solid fuel through partial combustion with air or oxygen in a single reactor. Air is used as the gasification agent, and the solid fuel is partially burned in the gasification reactor. Combustion and gasification, the heat required for solid fuel gasification is provided by the combustion process, resulting in the mixing of flue gas produced by combustion into the gasification products, which significantly reduces the quality of solid fuel gasification products; using pure oxygen as the gasification medium can Significantly increase the calorific value of solid fuel gasification products, but it needs to produce pure oxygen, which consumes a lot of energy

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