Coal-burning boiler

Abstract

The invention provides a coal boiler, comprising a boiler body and a grate; the lower side of the grate is provided with a lower fan which is communicated with a combustion chamber which is arranged at the bottom of the boiler; smoke in the boiler body enters a deduster through a high temperature heating surface and a low temperature heating surface; the coal boiler is characterized in that the lower side of the deduster is connected with a first smoke re-circulation pipeline which is provided with a re-circulation fan and communicated with the lower fan by a gas conveying pipe; the smoke and combustion air at the bottom of the boiler are mixed and enter the combustion chamber at the bottom of the boiler; the gas conveying pipe is provided with a flux control adjuster; the first smoke re-circulation pipeline is provided with a first isolation adjuster which is used for isolating and adjusting the smoke quantity; the first smoke re-circulation pipe is connected with a second smoke re-circulation pipeline provided with a second isolation adjuster; the second smoke re-circulation pipe is communicated with a hearth by an upper layer fan; the isolation adjuster and the re-circulation fan are respectively provided with a interlocking device; and the coal boiler can improve the boiler efficiency, reduce the smoke, the darkness of the smoke and the exhaust of NOX simultaneously, and can reconstruct the existing coal boilers of different types and capacities.

Description

technical field [0001] The present invention relates to the field of a coal-fired boiler, specifically a boiler that can improve the efficiency of the coal-fired boiler and reduce smoke and NO X Emission coal-fired boilers; it is especially suitable for transforming existing mechanical coal-fired boilers to reduce pollution to the surrounding environment and increase their efficiency and output. Background technique [0002] The structure of the existing mechanical coal-fired boiler includes a furnace body and a connected high-temperature heating surface and a low-temperature heating surface. The lower part of the furnace body is provided with a fire grate, and the upper part of the fire grate is provided with a furnace; The air blower communicates with the furnace bottom combustion chamber. The flue gas of the furnace passes through the high-temperature heating surface and the low-temperature heating surface and enters a dust collector, and the dust collector discharges th...

AI Technical Summary

Problems solved by technology

[0003] The operation of the above-mentioned mechanical coal-fired boiler is limited by the factors of excess air volume, which leads to more ash particles carried by the boiler flue gas, and it is difficult to control the phenomenon of black smoke, forming NO X Excessive discharge of the exhaust gas causes pollution to the surrounding environment; secondly, the flue gas of the existing mechanical coal-fired boiler is directly discharged through the chimney, and no recycling is adopted, so its technical and economic benefits are low, and it cannot adapt to modern industry. needs

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