System and method for coal particle and steam co-production of biomass

Abstract

The invention relates to a system and a method for coal particle and steam co-production of biomass. The system comprises a fluidized bed gasifier, a gas-solid separation mechanism and a fuel gas boiler which are connected in sequence; the inner wall of a fuel gas staged combustion burn-out boiler is a water-cooled wall, a partition water-cooled wall is arranged inside the fuel gas staged combustion burn-out boiler, and the partition water-cooled wall divides the fuel gas boiler into a combustion chamber and a waste heat recovery chamber with the bottoms in communication with each other; fuelstaged combustion air pipes are arranged in a combustion burn-out chamber and an inlet flue, a heating surface is arranged in the waste heat recovery chamber, and a tail flue used for discharging fluegas is connected to the side of the waste heat recovery chamber of the fuel gas boiler; the fuel gas boiler is connected to a steam pocket used for collecting superheated steam generated by the water-cooled wall, the partition water-cooled wall and a superheater; and the steam pocket is used for supplying saturated steam into the water-cooled wall, the partition water-cooled wall and the superheater for circulation. According to the system and method, the structure of the system is improved, so that coal particles and the superheated steam can be efficiently produced.

Description

technical field [0001] The invention relates to the technical field of biomass clean utilization, in particular to a system and method for cogeneration of biomass charcoal and steam. Background technique [0002] my country is very rich in biomass resources, and the annual output of agricultural and forestry waste alone exceeds 1 billion tons. By developing utilization technologies for biomass resources, the current energy structure can be optimized to make up for the limitations of fossil energy resources. [0003] At present, the main utilization technologies of biomass resources are biomass direct combustion and biomass gasification. Biomass gasification can convert the volatile matter rich in biomass into CH through pyrolysis and thermochemical oxidation reactions. 4 、H 2 Compared with direct combustion technology, biomass gasification combustion has the characteristics of high comprehensive efficiency, high benefit, low investment cost and diverse raw materials, and i...

AI Technical Summary

Problems solved by technology

[0005] For example, most of the existing processes use burners or internal combustion engines to utilize the combustible gas produced by biomass gasification, and a certain amount of tar gas and fine ash particles are bound to be produced during biomass gasification. When there is a temperature gradient, the tar gas is very Easy to precipitate, block pipelines and equipment

Therefore, combustible gas needs to be deeply purified before entering the burner or internal combustion engine, which greatly increases the cost of production and operation. At the same time, it is necessary to regularly clean the related equipment, which increases the maintenance cost.

Moreover, the existing gas combustion process usually has a relatively high combustion temperature, and the structure of the combustion atmosphere is difficult, resulting in NO in the flue gas x The emission concentration is relatively high

[0006] In addition, the process of using a burner or an internal combustion engine cannot form a large-scale application mode and cannot meet market demand

[0007] In addition, the existing biomass gasification combustion process only focuses on the efficient use of combustible gas, while the fixed carbon in biomass is often ignored, and is usually treated as waste together with ash. From the perspective of comprehensive resource utilization efficiency, The existing biomass gasification combustion process is not perfect

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