Solid fuel dual fluidized bed partial gasification fractional conversion device and method

Abstract

The invention relates to the technology of synthesis gas manufactured with solid fuel and aims at providing a solid fuel double-fluidized bed partial gasification classified converting device and method. The device is composed of a normal-pressure or pressured fluidized bed gasification furnace and a fluidized bed combustion furnace, wherein the pressure ranges from 0.1 MPa to 5 MPa in the pressurized running process. The method comprises the steps that oxygen or water vapor or carbon dioxide serves as a gasification agent, solid fuel is gasified in the fluidized bed gasification furnace firstly to generate synthesized gas, and then semi-coke generated through gasification is fed into the fluidized bed combustion furnace to be combusted. Double fluidized beds are adopted to produce the synthesized gas and high-temperature flue gas at the same time, and thus classified conversion of solid fuel is achieved; high fuel adaptability is achieved, fewer pollutants are discharged, operation is easy, the handling amount is large, and mass production is easy to achieve. The content of tar in the produced synthesized gas is small, and the heat value is high. Compared with a complete gasification technology, an excessively-high carbon conversion rate is not emphasized, and needed oxygen is remarkably reduced; meanwhile, reactions can be reduced, equipment manufacturing cost is reduced, and a greater advantage is achieved on economy.

Description

technical field [0001] The invention relates to the technology of preparing synthesis gas from solid fuel, in particular to a dual fluidized bed partial gasification and graded conversion device and method for solid fuel. Background technique [0002] my country's energy structure is coal-rich, oil-poor, and gas-deficient. my country is rich in coal resources and has a huge output. Coal accounts for 70% of my country's total energy consumption. However, the direct combustion of coal causes serious environmental pollution, which has a great impact on the sustainable development of the country's economy and people's lives. In addition, as one of the clean and renewable energy sources, biomass resources are also abundant in my country. Therefore, using relatively abundant solid fuels such as coal and biomass for power generation and synthesis gas production using relatively clean coal gasification technology can reduce environmental pollution and at the same time ease the pres...

AI Technical Summary

Problems solved by technology

[0003] However, the existing gasification technology basically adopts the complete gasification method, which needs to achieve a very high carbon conversion rate under the condition of high temperature and high pressure. The harsh reaction conditions greatly increase the manufacturing cost and maintenance cost of the reaction equipment.

At the same time, the complete gasification technology consumes a lot of oxygen and needs to be equipped with a large-scale air separation unit, which greatly increases the construction cost

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