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Coal and tobacco stem co-fired boiler and its pollutant control method
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A tobacco stem and co-firing technology, applied in the combustion method, combustion type, combustion equipment and other directions, can solve the problems of coking, ash accumulation, coal and tobacco stem slagging, etc., and achieve the effects of reducing wear, solving coking and low speed
Inactive Publication Date: 2017-10-24
湖南博茂节能环保科技有限公司
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[0016] The purpose of the present invention is to provide a coal and tobacco stem co-firing boiler and its pollutant control method to solve the problems of slagging, coking and ash accumulation in coal and tobacco stem co-firing
Method used
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specific Embodiment approach 1
[0036] Specific implementation mode one: as Figure 1~Figure 4 As shown, the coal and tobacco stem co-fired boiler includes a fluidized bed combustion chamber 1, a fluidized bed dilute phase area 2, a fluidized bed dense phase area 3, multiple buried pipes 4, a high-speed bed air distribution plate 5, two Low-speed bed distribution air plate 6, high-speed bed air chamber 7, low-speed bed air chamber 8, slag outlet 9, multiple secondary air outlets 10, left and right wall membrane water cooling walls 11, front and rear wall membrane water cooling walls 12, combustion chamber outlet 13. The first cooling chamber 14, the U-shaped groove separator 15, the intermediate membrane water wall partition wall 16, the second cooling chamber 17, the flue gas outlet 18, the upper steam drum 19, the lower steam drum 20, and the first convection pipe 21 , Convection pipe partition wall (membrane wall) 22, second convection pipe 23, tail flue gas channel 24, multiple pulse soot blowers 25, eco...
specific Embodiment approach 2
[0038] Specific implementation mode two: as figure 1 As shown, in the coal and tobacco stem co-firing boiler described in Embodiment 1, an adjustment baffle 37 is provided on the flue connected to the inlet end of the recirculation fan 33 and the outlet end of the bag filter 32 for adjusting Circulating flue gas volume.
specific Embodiment approach 3
[0039] Specific implementation mode three: as Figure 1~Figure 4 As shown, the method for realizing pollutant control by using coal and tobacco stem co-fired boiler described in the specific embodiment one or two, the method includes the following steps:
[0040] Step 1: Coal, tobacco stems and kaolin (additive) with a diameter of ≤ 2mm enter the high-speed bed in the dense phase zone 3 of the fluidized bed through the feed port 30 and burn by gravity (because it is a negative pressure feed, the feed port 30 It is a slight negative pressure and will not spray fire outwards. When the negative pressure at the outlet 13 of the combustion chamber is about -150Pa, negative pressure feeding can be realized), and the heat generated by combustion passes through the low-speed bed arranged in the fluidized bed combustion chamber 1 Control the temperature of the high-speed bed and low-speed bed in the dense-phase area 3 of the fluidized bed between 800 and 850°C after heat exchange with ...
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Abstract
The invention discloses a coal and tobacco stem multi-fuel-fired boiler and a contaminant control method thereof, and belongs to the field of coal and tobacco stem waste multi-fuel-fired biomass boilers. The problems of slag-bonding, coking and ash depositing in multi-fuel combustion of coals and tobacco stems are solved. A combustion chamber outlet is formed in the upper part of a fluidized bed combustion chamber; first and second cooling chambers are sequentially arranged behind the combustion chamber outlet; the two cooling chambers are separated by a middle film type water-cooling wall partition wall; the lower end of the middle film type water-cooling wall partition wall is communicated with a lower header by a lower steam drum; the lower header is connected with a U-shaped slot separator; a smoke gas outlet of the second cooling chamber is communicated with a first convection tube bank; the first convection tube bank is communicated with a second convection tube bank; the second convection tube bank is communicated with a tail smoke gas channel; the tail smoke gas channel is provided with a coal economizer as well as a primary air pre-heater and a secondary air pre-heater; lower-end outlets of the two cooling chambers are communicated with an ash return tube; the ash return tube is communicated with a fluidized bed dense-phase zone; and the tail smoke gas channel is communicated with a semidry-method desulfurizing tower and a bag dust collector. The boiler disclosed by the invention is used for multi-fuel combustion of coals and tobacco stems.
Description
technical field [0001] The invention relates to a coal-fired and tobacco stem co-combustion boiler, which belongs to the field of coal and tobacco stem waste co-combustion biomass boilers. Background technique [0002] Waste such as tobacco stems is a by-product of the tobacco industry and the main raw material for the production of counterfeit cigarettes. National policy requires that they be destroyed. In the past, rebaking companies mostly used landfill or incineration for disposal, which easily caused serious pollution to the surrounding air, water, and soil, damaged the environment, and formed major safety hazards and loopholes in the supervision of tobacco monopoly. Rebaking of tobacco leaves consumes a lot of fuel, which leads to an increase in production costs. If tobacco stems are used as fuel to provide the steam required for production to rebaking enterprises and develop a circular economy, it is a problem that most rebaking enterprises must face and urgently need...
Claims
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