Composite arch structure in biomass fuel chain boiler

Abstract

The invention discloses a composite arch structure in a biomass fuel chain boiler. In the structure, the front wall of a boiler hearth is provided with a parabolic front arch which protrudes towards the interior of the hearth; the lower end of an oblique arch which is obliquely arranged is connected to the bottom part of the rear wall of the hearth; the upper end of the oblique arch is connected with a horizontal section of an L-shaped arch; the L-shaped arch and the oblique arch together form a rear arch of the boiler; the parabolic front arch, the upper vertical part of the L-shaped arch and side walls on the two sides of the hearth form a combustion chamber of the boiler; and the oblique arch and the side walls on the two sides of the hearth form a burn-out chamber of the boiler. The structure has the advantages that: a large amount of volatile matters can be quickly separated from a biomass fuel under the radiant heating action of the parabolic front arch; and further, high-temperature and high-efficiency combustion of volatile components in the combustion chamber is promoted. The structure is suitable for the biomass fuel chain boiler.

Description

technical field [0001] The invention relates to the field of chain boilers, in particular to a furnace arch structure in a chain boiler using biomass fuel. Background technique [0002] The combustion mechanism of biomass solid shaped pellet fuel (abbreviation: biomass fuel) is as follows: first, the ignition temperature is low and the combustion is fast, which reduces the nitrogen oxides produced by high-temperature combustion; second, the volatile content of biomass fuel is high, which is 3 times, the volatile matter (smoke) in the pellet fuel burns completely as soon as it is precipitated at low temperature, which can realize smokeless combustion; third, during the static combustion process, the dust emission is extremely low; fourth, the biomass fuel has low sulfur content, Less than 1 / 10 of coal-fired, no need to use additives for sulfur fixation and desulfurization, which meets environmental protection requirements; fifth, after biomass combustion, micropores a...

AI Technical Summary

Problems solved by technology

In the traditional coal-fired chain boiler, the furnace is equipped with an inclined rear arch, and the lower part of the chain grate is provided with a primary air distribution structure composed of a primary fan and an air chamber. This arch structure cannot adapt to biomass fuels. Combustion characteristics of high volatile content and fast burn-out speed lead to incomplete combustion, black smoke and tar dripping from the chimney, making it difficult to meet the requirements of environmental protection

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