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

A technology of bubbling fluidized bed and biomass fuel, which is applied in the direction of fluidized bed combustion equipment, combustion method, fuel burned in molten state, etc., can solve the problem of material separation and poor material circulation, low energy density of biomass fuel, The temperature in the upper part of the furnace is difficult to control and other problems, so as to improve the reliability of redundancy, reduce the cost of pretreatment, and simplify the fuel preparation and feeding system

Inactive Publication Date: 2007-03-14
ZHEJIANG UNIV
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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 f

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

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[0020] As shown in the figure, the bubbling fluidized bed combustion device that burns biomass fuel includes a furnace 3, the upper part of the furnace is connected with a secondary flue 4, a convection heating surface 9 arranged in the secondary flue, and then the tail is connected The flue 10, the dust collector 11, the induced draft fan 12 and the chimney 13, and the lower part of the secondary flue 4 is arranged with a sedimentation ash bucket 8, where the settled fly ash is returned to the variable cross-section furnace dense phase area 6 through the fly ash return device 7 , The biomass raw material storage bin 1 is connected to the fuel inlet 5 through the biomass crushing equipment 2.

[0021] Before the operation of the bubbling fluidized bed combustion device of biomass fuel, the bed material is screened by particle size. The maximum particle size of the bed material is controlled below 2mm. The corresponding average particle size of the bed material is determined accord...

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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. ...

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Application Information

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IPC IPC(8): F23C10/18F23C10/00
Inventor 骆仲泱余春江方梦祥周劲松王树荣王勤辉施正伦程乐鸣高翔倪明江岑可法
Owner ZHEJIANG UNIV
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