An integrated system for biomass gas purification and combustion tail gas waste heat recovery

Abstract

The invention discloses an integrated system for purifying biomass fuel gas and recycling combustion tail gas waste heat. The integrated system comprises a biomass gasifier, a filter, a heat exchanger and a combustion device, wherein the filter comprises two parallel filter cavities; a fuel gas inlet and a smoke gas outlet are formed in one end of each of the two filter cavities respectively; a fuel gas outlet and a smoke gas inlet are respectively formed in the other end of each of the two filter cavities correspondingly; the two independent filter cavities are arranged to respectively perform alternate treatment on the biomass fuel gas and biomass smoke gas; most of dust of the biomass fuel gas can be filtered when the biomass fuel gas passes through the filter cavities; tar can be cracked into combustible gas under the condition of high temperature so as to improve the gasification efficiency of the biomass fuel gas; when the high-temperature biomass smoke gas passes through the filter cavities, the filter can be heated to ensure that the high-temperature biomass smoke gas is in a high-temperature state, so that the cracking conditions of the biomass fuel gas can be provided; meanwhile, the temperature of the biomass fuel gas also can be increased so as to improve the combustion efficiency; finally, the biomass smoke gas is subjected to heat exchange treatment by virtue of the heat exchanger to fully recycle the waste heat of the biomass smoke gas.

Description

technical field [0001] The invention relates to the technical field of biomass energy purification and treatment, in particular to an integrated system for purification of biomass gas on industrial furnaces and recovery of waste heat from combustion tail gas. Background technique [0002] Biomass is a kind of clean and renewable energy, and its rational use can alleviate the pressure brought by the current conventional energy shortage and environmental pollution. Biomass gasification is one of the main ways to utilize biomass energy. Its basic process includes: biomass is converted into biomass gas through thermochemistry, and biomass gas is sent to boilers, aluminum melting furnaces or internal combustion generators through pipeline delivery systems Combustion and utilization in combustion equipment. [0003] However, in the process of biomass gasification, tar components and coke are inevitable by-products. Tar will condense at room temperature and form coke with coke and...

AI Technical Summary

Problems solved by technology

[0005] After biomass gas is burned, the flue gas can reach a very high temperature, especially in the production process of industrial aluminum melting furnaces, the flue gas temperature at the flue gas outlet usually reaches about 950°C, if these high-temperature flue gas Direct discharge into the environment will not only cause energy waste, but also cause a certain degree of damage to the environment.

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