Gas-solid two-phase separation and coupled biomass clean combustion device and combustion method

Abstract

A gas-solid separation and re-coupling type biomass clean combustion device comprises a spiral feeding system, a chain furnace grate, a solid combustion chamber, a reduction reaction chamber, a gas combustion chamber, a solid combustion air supply system, a primary gas combustion air supply system, a secondary gas combustion air supply system and a cuboid hearth. The spiral feeding system comprises an open hopper, a drive motor, a feeding shaft with a spiral fin and a spiral pipe. The device is provided with the independent reduction reaction chamber, the independent solid combustion chamber and the independent gas combustion chamber. A combustion method of the gas-solid separation and re-coupling type biomass clean combustion device includes the steps that biomass is firstly dissolved into gas and solid through self heat supply, dust of smoke generated after solid combustion is removed, a reduction reaction is conducted on the smoke and gas generated after thermolysis, and NOx is reduced; primary combustion and secondary combustion are conducted, generation of NOx is controlled, and combustion is thorough.

Description

technical field [0001] The invention relates to a gas-solid two-phase separation re-coupling type biomass clean combustion device and a combustion method thereof in the technical field of new energy clean combustion. Background technique [0002] The 2007 "China Energy Development Report" pointed out that the development and utilization of biomass energy in China is only 1%, and most of them are directly burned and utilized. At the same time, large-scale open burning of straw often leads to smog, causing serious air pollution and climate change. At present, biomass liquefaction and gasification technology cannot realize complete market-oriented operation, and is limited to complex technical conditions. It is only suitable for large-scale transformation and utilization in factories, and cannot adapt to the current situation of China's wide dispersion of biomass energy and high collection costs. . The development of small devices with simple structure, easy operation, and cl...

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Problems solved by technology

However, this design also has the following deficiencies: (1) The traditional technical scheme of burning a part of the material to heat another part of the material and pyrolyzing the gas does not make good use of the volatile matter to directly produce synthesis gas, while the solid phase Compared with synthetic gas produced after complex reactions, it is more conducive to the characteristics of stable combustion and heat supply; (2) There is no discussion on the treatment method of solid residues after gasification of materials in the gas phase furnace. If continuous production is carried out, it needs Further design; (3) The overall layout is scattered, which will inevitably cause a large amount of heat loss, which is not conducive to energy saving; (4) There are many components in the device and the cost is high, which is not conducive to miniaturization and popularization among ordinary users

Due to the large relative area of ​​the main grate at the rear end, although local hypoxia is used to control NOx, it is difficult to ensure that the beneficial effects in the early stage will not be offset by the combustion on the main grate, and there is no impact on the resulting NOx. Particulate matter suppression measures are not clean combustion in the full sense

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