Feeding device having backdraft cutoff function and used for biomass fuel boiler

Abstract

The invention provides a feeding device having a backdraft cutoff function and used for a biomass fuel boiler. The feeding device comprises a screw conveyor barrel; one end of the screw conveyor barrel is closed, and the other end of the screw conveyor barrel is open; the open end of the screw conveyor barrel is connected with an oblique feeding barrel, and a conveyor shaft is arranged in the screw conveyor barrel; the conveyor shaft is connected with a conveyor motor, and conveying propeller blades are arranged on the conveyor shaft; the top of the screw conveyor barrel is provided with a feeding port, and the inner wall top of the open end of the screw conveyor barrel is provided with a flame retardant self-closing plate through a rotating shaft; the bottom of the oblique feeding barrelis provided with a vertical discharging port connected with the biomass fuel boiler, and dispersed gas ports are formed in the position, directly facing the discharging port, on the side wall of the oblique feeding barrel; a plurality of material distributing devices are arranged in the oblique feeding barrel, and each material distributing device comprises a material distributing shaft; a plurality of material distributing plates are distributed on the periphery of each material distributing shaft uniformly, and each material distributing shaft is connected with a material distributing motor;and the top of the oblique feeding barrel is provided with an oblique directional purging gas port. According to the feeding device, backdraft of hot gas in the boiler can be avoided, and the combustion of biomass fuel is more thorough; and the utilization rate is higher.

Description

technical field [0001] The invention relates to the technical field of boiler feeding devices, in particular to a feeding device for blocking backburning of a biomass fuel boiler. Background technique [0002] With the increasing demand for energy in society, the fossil fuels as the main source of energy are rapidly decreasing, so biomass fuel boilers are getting more and more attention. There are many kinds of biomass fuels, such as wood chips, bark, branches, plant straw, bamboo, building templates, etc. Generally, biomass fuels are crushed and enter the boiler through the feeding device for combustion. [0003] However, the current feeding device is directly connected to the inner cavity of the boiler, causing the flue gas to easily flow back and ignite the fuel inside the feeding device. In severe cases, it can ignite the front feed bin and cause a fire; It is light and viscous, and is prone to agglomeration. Directly entering the boiler will easily lead to too thick lo...

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Problems solved by technology

[0003] However, the current feeding device is directly connected to the inner cavity of the boiler, causing the flue gas to flow back easily, igniting the fuel inside the feeding device, and in serious cases, it can ignite the front feed bin and cause a fire; and the biomass fuel has a large moisture content and a heavy weight Light and viscous, it is prone to agglomeration. Directly entering the boiler will easily lead to too thick local accumulation and insufficient oxygen supply, which will cause insufficient combustion inside the boiler and produce a large amount of black smoke, which will affect the use of the boiler.

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