Low-nitrogen pulverized coal organic heat carrier boiler

Abstract

The invention discloses a vertical low-nitrogen pulverized coal organic heat carrier boiler which comprises a burner, a lower part radiation section pipe manifold, an upper part radiation section pipe manifold, a connecting pipe, a hearth, a tertiary air pipe, a roof pipe manifold, an explosion door, a hearth smoke outlet, an access door, a high-low temperature convection bank, ash falling pipes, slag extractors, a longitudinal channel, a high-temperature air preheater, waste heat equipment, a low-temperature air preheater and a dust collector, wherein the hearth is internally provided with the lower part radiation section pipe manifold, the upper part radiation section pipe manifold and the roof pipe manifold; the high-low temperature convection bank is arranged in the longitudinal channel communicated with the hearth smoke outlet; the high-low temperature convection bank, and the connecting pipe, the lower part radiation section pipe manifold, the upper part radiation section pipe manifold and the roof pipe manifold are sequentially communicated to form a closed heating medium circulation system. Heating surfaces are arranged in the whole hearth, so that a noncoking state can be ensured at nominal output. In addition, the burning is uniform, the temperature difference between the front and back is low, so that the reduction of the content of NOx can be facilitated. The connecting pipe is arranged outside the hearth, and is free from heat, so that heat transfer oil can be prevented from being gasified.

Description

technical field [0001] The invention relates to the field of pulverized coal industrial boilers, in particular to a pulverized coal organic heat carrier boiler for forced circulation, which uses pulverized coal as fuel. Background technique [0002] At present, my country's industrial boilers generally use coal or oil or gas as fuel. However, the disadvantages of traditional industrial coal-fired boilers are low combustion efficiency, high manual labor intensity, and serious pollution, making it difficult to meet the requirements of energy saving and emission reduction and pollutant discharge. Although the fuel oil and gas boilers have high efficiency and good environmental protection benefits, the operating costs are too high and the economic benefits are poor, which is difficult for users to accept. [0003] Coal powder combustion is one of the efficient and clean combustion methods of fuel, and its combustion efficiency can be as high as 98%. It is a mature combustion te...

AI Technical Summary

Problems solved by technology

[0004] 1) The combustion is not uniform enough, and the temperature difference between front and back is relatively large, which is not conducive to reducing NO X Content

[0005] 2) The load adjustment range is small, only a single fuel - pulverized coal can be used

[0006] 3) Boiler ash and slag cleaning is inconvenient

[0007] 4) Large consumption of boiler steel and furnace wall materials

[0008] 5) The boiler room occupies a large area and the cost of civil construction is high

[0009] 6) The sealing performance of the boiler is not good, the air leakage of the brick wall is large, the heat loss of the boiler is large, and the power consumption of the induced draft fan is large

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