Mixed fuel coal water slurry entrained flow bed gasification system

Abstract

The invention belongs to the technical field of biological energy and discloses a mixed fuel coal water slurry entrained flow bed gasification system. The mixed fuel coal water slurry entrained flow bed gasification system comprises an entrained flow bed coal water slurry gasifier, a pretreatment module, a coal water slurry preparation module, a purification module and a separation oxygen supply module, wherein the pretreatment module receives biomass to be treated and is connected with the input end of the coal water slurry preparation module, the coal water slurry preparation module receives biological coke charges output by the pretreatment module and carries out milling and pulping treatment, the output end of the coal water slurry preparation module is connected with the entrained flow bed coal water slurry gasifier and outputs coal water slurry, the entrained flow bed coal water slurry gasifier is connected with the separation oxygen supply module to receive combustion-supporting gas and is also connected with the purification module to output combustion gas, and the purification module is connected with an air separator and outputs the combustion-supporting gas. The invention can realize large-scale utilization of the biomass, does not generate gasification tars and enhances the carbon conversion rate of coal gasification.

Description

technical field [0001] The invention relates to a device in the technical field of bioenergy, in particular to a coal-water slurry entrained gasification system using a mixed fuel of biomass and coal. Background technique [0002] Biomass is a kind of renewable energy, which contains less pollutants such as sulfur and nitrogen, and its thermochemical conversion will not cause additional carbon dioxide emissions. Compared with fossil fuels such as coal and petroleum, biomass has high moisture content, low ash content, low energy density, scattered resources and seasonal characteristics. The solid coke obtained by carbonization pretreatment of biomass has similar elemental composition to coal, but the alkali metal contained in biomass ash can catalyze the coal gasification reaction, thereby improving the carbon conversion rate and gasification efficiency, and the melting point of biomass ash Low, mixed gasification can lower the melting point of coal ash and is beneficial to ...

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Problems solved by technology

However, the operation of the equipment is very complicated, and the moisture content of the biomass is high, so the overall gasification efficiency is not high

In addition, the temperature in the gasification stage is low, which is not conducive to the gasification reaction of carbon.

In addition, the two fuels are fed separately, and the high-temperature carbon bed is generated by coal combustion first, and then biomass and water vapor are added for gasification reaction, so it is difficult to achieve the synergistic effect of mixed gasification of biomass and coal

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