Fly ash separation and returning device for layer-burning biomass boiler

Abstract

The invention discloses a fly ash separation and returning device for a layer-burning biomass boiler. The device consists of a returning leg and a cyclone concentrator, wherein the cyclone concentrator consists of a cylindrical transition section, a funnel-shaped taper tube, a cylindrical central tube, a tobacco pipe-shaped inlet and a heat-resistant alloy steel filter screen mesh; the returning leg is arranged on the lower part of the cyclone concentrator, and is communicated with a lower cavity of a rear arch of the layer-burning biomass boiler; the cylindrical central tube is arranged in the upper center of the cylindrical transition section; the heat-resistant alloy steel filter screen mesh is arranged on the upper side part of the cylindrical transition section in a downward inclination way. According to the device, flue gas carrying a great number of small unburned biomass fuel particles enters the cylindrical transition section from the tobacco pipe-shaped inlet, the small unburned biomass fuel particles are separated and concentrated to an inlet of the returning leg, and reenter a hearth for burning under the action of the heat-resistant alloy steel filter screen mesh due to the fact that the flow velocity of the flue gas rapidly decreases, and clean flue gas flows out of the cylindrical central tube; therefore, the efficiency of the boiler is improved, tail burning risks are lowered, and equipment such as a bag-type dust collector is protected.

Description

technical field [0001] The invention relates to a separation and return device, in particular to a separation and return device for fly ash of a layer-fired biomass boiler, which belongs to the technical field of high-temperature gas-solid separation. Background technique [0002] Fossil energy sources such as coal, oil, and natural gas provide energy and power for the development of human society, but also cause great harm to the living environment of humans, such as greenhouse effect, NOx emissions, SO2 emissions, and dust pollution. At the same time, human society is also facing the problem of fossil energy depletion. Therefore, seeking to develop new energy sources and realizing the sustainable development of society has been paid more and more attention by countries all over the world. Biomass energy, as a renewable clean energy, has a good development prospect. The National Academy of Sciences of the United States clearly stated in "Energy Transformation 1985-2010": ...

AI Technical Summary

Problems solved by technology

However, these debris still ignite spontaneously in the lower part of the cyclone separation device and the material legs, often burning the cyclone separation device, and greatly increasing the exhaust gas temperature, threatening the safety of the bag filter and damaging its life

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