Bubble fluidised bed combustion device and method for burning-used biologic mass fuel

Abstract

The invention relates to a bubble fluidized bed combustor with biomass fuel and the method. The combustor comprising higher furnace chamber, binary flue duct and the heating surface such as overheater connected with the binary flue duct. It also contains tail flue, collector, induced fan, chimney and fly-ash return device set on the lower end of binary flue duct where the collecting fly-ashes are delivered into combustion dense phase of furnace so as to improve burnout rate of fly-ash. Said furnace dense phase is various cross-sections. Biomass fuel is delivered into furnace chamber assisted by wind after preprocessed by crushing equipment through the feed port at the front of boiler in parallel, here soft straws is crushed under 10cm and is delivered into boiler. Mature and stable fluidized combustion technology is applied in combusting straws and stalks biomass and it is provided with wide application for stock, high combusting efficiency and efficiently solve the problem of alkali metals during the combusting process of high alkali biomass.

Description

technical field [0001] The invention relates to a bubbling fluidized bed combustion device and method for burning biomass fuel, and the biomass includes a wide variety of agricultural and forestry wastes such as rice straw, branches, fruit shells and the like. Background technique [0002] my country has very rich biomass resources, and the combustion and utilization of biomass is of great significance to alleviate the shortage of conventional energy, reduce pollutant emissions, solve the problem of rural straw utilization, and increase farmers' income. However, at present, there is no effective large-scale combustion and utilization of biomass technology in China, especially for straw raw materials that constitute the main body of my country's biomass resources. Due to the special physical and chemical properties and combustion characteristics of straw, only Denmark has mastered the relatively mature straw burning technology with vibrating grate as the basic furnace type. ...

AI Technical Summary

Problems solved by technology

However, the conventional fluidized bed is not suitable for directly burning biomass fuels such as straw. The characteristics of rich metal content will bring a lot of troubles to the conventional fluidized combustion process, resulting in poor feeding, difficult control of the upper furnace temperature, difficult secondary air organization, poor material separation and material circulation, and specific fuel consumption. Alkali metal problems are difficult to overcome when material fuels

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