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

A biomass boiler and fly ash separation technology, which is applied in combustion equipment, solid fuel combustion, lighting and heating equipment, etc., can solve the problems of increasing exhaust gas temperature, damage life, burning cyclone separation device, etc., to improve boiler efficiency , to avoid the effect of burning

Inactive Publication Date: 2015-01-28
SHENYANG INST OF ENG
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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

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

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Embodiment

[0019] The biomass boiler fly ash separation and return device provided by the present invention is tested on a 75t / h combined grate steam boiler, and is installed at the turning point between the third high-temperature superheater and the second high-temperature superheater. The fuel is a mixture of rice straw, rice husk and broken plywood. Among them, the rice straw is mixed with soil, and the industrial analysis results are 14.17% of total moisture, 66.33% of volatile matter, 4.57% of fixed carbon, and 14.93% of ash content. After 1 kg of rice straw is ash, it contains 22.8 grams of K element; the industrial analysis result of rice husk is Total moisture %, volatile matter 69.3%, fixed carbon 14.9%, ash content 10.8%; plywood industrial analysis results: total moisture 8.2%, volatile matter 36.7%, fixed carbon 49.3%, ash content 5.8%.

[0020] Originally, a high-temperature cyclone concentrator was installed at the turning point between the third high-temperature superheate...

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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": ...

Claims

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Application Information

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IPC IPC(8): F23B70/00
Inventor 王启民丁飞王宝石衣云龙张小辉
Owner SHENYANG INST OF ENG
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