Grate firing biomass boiler

Abstract

The invention relates to a grate firing biomass boiler, which comprises a fire grate, a feeding device, a furnace hearth, a furnace hearth front arch, an overheater, a screen type water cooling wall, an overheater dust falling device and the like, wherein the material feeding device comprises a material pusher, a material falling passage, a radiation-proof separation wall and the like, the radiation-proof wall is arranged on a furnace wall between the material falling passage and the furnace hearth front arch, and extends for 100 to 600mm in the furnace hearth, a lower end surface angle gama is between 0 and 60 degrees, the dust falling device is arranged at the bottom part of the overheater, the width of the dust falling device is 0.7 to 1.3 times the width of the overheater, the height h of a separation plate is 0.7 to 0.95 time the height H of the center of the dust falling device, and both the angle gamma 1 of a first inclined plate and the angle gamma 2 of a second inclined plate are between 60 and 75 degrees. The invention has the advantages that the boiler material feeding radiation-proof structure can prevent the tempering, the material feeding device can be protected, the continuous operation of the boiler can be ensured, the overheater dust falling device can collect a part of smoke dust, can ensure that the smoke dust are brought away by airflows, and can prevent the abrasion on pipes caused by the accumulated dust of the overheater.

Description

technical field [0001] The invention relates to a layer-fired biomass boiler, which belongs to biomass burning equipment. Background technique [0002] my country is a country that uses coal as its main energy source. Coal-fired industrial boilers account for more than 80% of the total industrial boilers, oil-fired gas boilers account for about 15%, electric heating boilers account for about 1%, and the rest are fueled by biogas, black liquor, bagasse, biomass (garbage), etc. . Among the industrial boilers in use nationwide, boilers with a boiler capacity of less than 35t / h account for about 98.9% of the total industrial boilers, of which less than 20% are greater than or equal to 20t / h, 75% are 2-10t / h, and less than 1t / h accounts for 5%, and the average boiler capacity is less than 3t / h. The design efficiency of national industrial boilers is 72% to 80%, but the average operating efficiency is 60% to 65%, which is far below the international level. The boiler has smal...

AI Technical Summary

Problems solved by technology

[0004] (1) There are defects in the design of the fuel supply system, which is prone to tempering and damages the feeding device

[0005] (2) Dust is easy to accumulate on the heat exchange surface of the boiler, which leads to the wear of the heat exchange tube, the equipment cannot work normally, and affects the heat exchange efficiency, reducing the output of the boiler

[0006] (3) The layout of the heat exchange surface is insufficient, and the design output cannot be achieved

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