Composite structure for high-temperature spiral secondary air and arch in biomass fuel chain boiler
A biomass fuel and chain boiler technology, applied in the direction of combustion air/fuel supply, non-flammable liquid/gas transportation, combustion chamber, etc., can solve the problem of black smoke from the chimney, difficulty in meeting environmental protection requirements, and inability to adapt to biomass High volatile content of fuel, combustion characteristics of burnout speed, etc., to achieve the effect of promoting high-temperature and high-efficiency combustion and reducing the content of fly ash
Inactive Publication Date: 2013-07-10
张家港威孚热能股份有限公司
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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. There is no secondary air distribution structure in the furnace. This kind of furnace arch structure and primary air distribution structure cannot adapt to the combustion characteristics of biomass fuel with high volatile content and fast burnout speed, resulting in insufficient combustion, black smoke and tar dripping from the chimney, and it is difficult to meet the requirements of environmental protection
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[0018] The combined structure of the high-temperature spiral secondary air and the furnace arch in the biomass fuel chain boiler according to the present invention will be further described below in conjunction with the accompanying drawings.
[0019] Such as figure 1 , Image 6 , figure 2 , image 3 As shown, the combined structure of the high-temperature spiral secondary air and the furnace arch in the biomass fuel chain boiler includes: a parabolic front furnace arch 4 protruding into the furnace is provided on the front wall of the boiler furnace 33, and the oblique setting The lower end of the inclined furnace arch 51 is connected to the bottom position of the rear wall of the furnace 33, and the upper end of the inclined furnace arch 51 is connected with the horizontal section of the "L" shaped furnace arch 5, and the "L" shaped furnace arch 5 and the inclined furnace arch 51 are in common Composing the rear furnace arch of the boiler, there is a secondary air main p...
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The invention discloses a composite structure for high-temperature spiral secondary air and an arch in a biomass fuel chain boiler. In the composite structure, the front wall of a boiler hearth is provided with a parabolic front arch which protrudes towards the interior of the hearth; an L-shaped arch and an oblique arch together form a rear arch of the boiler; a sinuous secondary air main pipe is arranged between the parabolic front arch and the L-shaped arch to spirally rise secondary air; an oblique secondary air pipe is arranged below the oblique arch; and both the oblique secondary air pipe and the sinuous secondary air main pipe are communicated with an air pre-heater and a secondary induced draught fan. According to the characteristics of a biomass fuel, a skilful composite arch structure and a rational primary and secondary air distribution structure are adopted, so that a temperature field in the hearth is uniformly distributed, the biomass fuel can be quickly and completely burnt out, biological tar and black smoke are prevented from generating, the combustion efficiency is higher and reaches over 79 percent, and high-efficiency clean combustion of the biomass fuel is realized.
Description
technical field [0001] The invention relates to the field of chain boilers, in particular to secondary air distribution and furnace arch structures in chain boilers 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 com...
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IPC IPC(8): F23L9/00F23L1/00F23L15/00F23M5/06F23M5/08
CPCY02E20/34
Inventor 凌少东唐海荣曹卫
Owner 张家港威孚热能股份有限公司