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Biomass gasification boiler using air-steam as gasifying agent and coupling combustion method thereof

A gasification boiler and steam technology, applied in the field of boiler combustion, can solve the problems of easy slagging, low thermal efficiency, and high tar content, and achieve the effects of reducing fly ash, improving conversion efficiency, and improving gasification quality

Inactive Publication Date: 2010-06-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a biomass gasification boiler and a coupled combustion method using air water vapor as the gasification agent to solve the problems of low thermal efficiency, high tar content in the gasification gas, and high temperature in existing biomass gasification boilers. Problems such as easy slagging on the heating surface

Method used

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  • Biomass gasification boiler using air-steam as gasifying agent and coupling combustion method thereof

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specific Embodiment approach 2

[0016] Specific implementation mode two: as Figure 1~4 As shown, the central axes of the plurality of tangential nozzles 5-2 in this embodiment are tangent to the concentric imaginary circle R2 whose radius is 1 / 4 to 1 / 3 of the cross-section circle R1 of the inner wall of the furnace. Such setting can make the powdery biomass material burn more fully. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0017] Specific implementation mode three: as Figure 4 As shown, the biomass gasification boiler in this embodiment further includes a spiral slagging machine 15, and the spiral slagging machine 15 is arranged on the furnace body below the ash chamber 2. The spiral slagging machine is a component in the prior art. Other compositions and connections are the same as those in Embodiment 1 or 2.

[0018] Specific implementation mode four: as Figure 4 As shown, the biomass gasification boiler in this embodiment further includes a vibrating ash loosening device 16 , and the vibrating ash loosening device 16 is installed on the edge of the fire grate 3 and is located outside the furnace body 21 . Vibrating the ash loosener 16 is a component in the prior art. Other components and connections are the same as those in the third embodiment.

specific Embodiment approach 5

[0019] Specific embodiment five: the coupled combustion method of the biomass gasification boiler using air water vapor as the gasification agent described in this embodiment is realized according to the following steps: Step 1, using screw feeder 9 to feed the biomass After the fuel is sent into the gasification combustion chamber 12, it is in a suspended state, and the temperature of the gasification combustion chamber 12 is controlled below 600°C; Step 2: Use the heat generated in the gasification combustion chamber 12 to heat the air and atomize the fine particles The water mist is gasified into water vapor, and then the hot air and water vapor are mixed and sprayed into the gasification combustion chamber 12 from the nozzle hole at the bottom of the grate 3 as a gasification agent. The hot air in the gasification agent is primary air; The upper gasification combustor 12 provides tangential secondary air supply; fully converts the biomass into combustible gases: hydrogen an...

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Abstract

The invention provides a biomass gasification boiler using air-steam as a gasifying agent and a coupling combustion method thereof, belongs to the technical field of boiler combustion, and solves the problems of low heat efficiency, high tar content in gasified gases, easy slag bonding of a high-temperature heating surface and the like existing in the conventional biomass boiler. In the biomass gasification boiler of the invention, a baffle plate is arranged in a closed ring-shaped atomization cavity, an air inlet tube is communicated with the closed ring-shaped atomization cavity on the side of the baffle plate, a water inlet tube is communicated with the closed ring-shaped atomization cavity on the other side of the baffle plate by an atomization nozzle, and an outlet of a hot air-steam mixed pipeline is communicated with the closed ring-shaped atomization cavity between the baffle plate and the atomization nozzle. The method mainly comprises the following steps of: mixing hot air and steam to obtain a mixed gas serving as the gasifying agent, spraying the mixed gas in a gasifying combustion chamber by a spraying hole at the bottom part of a furnace grate to fully convert the biomass into the combustible gas, filling the generated hydrogen gas and carbon monoxide in a complete combustion chamber of a gas fired boiler for combustion with three times of air feeding. The biomass gasification boiler has the advantages of high heat efficiency, low tar content in the gasified gases, no slag bonding of the high-temperature heating surface and the like.

Description

technical field [0001] The invention relates to a gasification combustion boiler for burning powdery biomass and a method for coupling combustion with the boiler, belonging to the technical field of boiler combustion. Background technique [0002] The existing biomass direct combustion technology can be divided into three types: fixed bed, fluidized bed, and suspension combustion. At present, there is no ideal biomass fuel boiler product in the domestic market. The design of various biomass fuel boilers is still manufactured by the fixed bed combustion method of coal-fired boilers. Due to the fuel characteristics of biomass fuel and coal There is an obvious difference. After most biomass fuels are dried, the volatile matter quickly detaches from the parent body and burns rapidly, but does not attach to the surface of the biomass fuel and burns. The fuel residue after the volatile matter escapes is black or coke-like dark red. , there is no obvious flame, relying on the radi...

Claims

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Application Information

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IPC IPC(8): F23L7/00F23L9/02F23J1/06C10J3/80
CPCY02P20/10
Inventor 李炳熙李洪涛靖洪铭张亚宁
Owner HARBIN INST OF TECH
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