Biomass gasification-circulating fluidized bed boiler combined power generation system and working method thereof

Abstract

The invention discloses a biomass gasification-circulating fluidized bed boiler combined power generation system and a working method thereof, belonging to a biomass efficient utilization and power generation technique. At present, the biomass direct combustion power generation technique has the problems of high cost and small scale; the biomass blend combustion technique has the problems of low blend combustion ratio, technical difficulties and high cost; and the gasification power generation technique has the problems of higher technical requirements for power generating equipment (gas turbines, internal combustion engines and the like), low energy utilization efficiency and higher cost. In order to solve the technical problems above, the coproduction of the biomass gasification technique and the circulating fluidized bed boiler power generation technique is utilized to avoid the biomass direct combustion power generation and blend combustion; a thermal circulation loop is arranged between a biomass gasification system and a fluidized bed boiler power generation system to perform high-temperature combustible gas waste heat recovery; and an air preheating system is arranged at the waste heat recovery low-temperature section of the biomass gasification system, thereby enhancing the charged medium temperature of a gasification furnace, and increasing the energy utilization efficiency of the system. The biomass gasification-circulating fluidized bed boiler combined power generation system provides a convenient, low-cost, safe and efficient way for development and utilization of biomass resources.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency utilization of biomass, in particular to a biomass gasification-circulating fluidized bed boiler combined power generation system and a working method. Background technique [0002] my country's biomass production is large and widely distributed. The traditional simple incineration treatment method not only caused serious environmental pollution problems, but also caused a huge waste of resources. Biomass energy is essentially carbon from the earth's crust that stores solar energy through biological photosynthesis, and its utilization process is the release of solar energy and the "return" process of carbon. Therefore, the use of biomass energy will not cause additional carbon emissions. Clean and efficient utilization of biomass is an effective way to optimize my country's energy structure, control environmental pollution and reduce "carbon emissions". [0003] At present, biomass powe...

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Problems solved by technology

[0004] Biomass direct combustion power generation technology is limited to raw material supply and technology development stage. Under the current situation, the scale of power generation is greatly restricted, and the power generation efficiency is not high.

Coal-fired boiler co-combustion power generation technology uses coal-fired boilers as combustion equipment, considering that the characteristics of biomass itself are very different from coal, so the proportion of co-combustion is limited without changing the original production equipment. very restrictive

If a large proportion is blended, it will easily lead to unstable operation of the boiler and production accidents.

Biomass gasification power generation technology has high requirements on power generation equipment (gas turbine, internal combustion engine) and other equipment because the combustible gas produced by gasification contains high concentrations of tar and other impurities, resulting in high cost and technical difficulties

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