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Graded heating pulverizing system based on heat pipe technology and control method thereof

A technology of graded heating and pulverization system, which is applied in lighting and heating equipment, indirect heat exchangers, grain processing, etc., can solve the problem of low temperature of air-powder mixture at the explosion-proof safety outlet of coal mills, and avoid the arrangement of heat exchange devices , high heat transfer efficiency, and low energy loss

Pending Publication Date: 2020-12-04
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] The purpose of the present invention is to provide a graded heating pulverization system based on heat pipe technology and its control method in order to overcome the safety problems of coal mill explosion prevention and the generally low temperature of the outlet air-powder mixture in the prior art

Method used

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  • Graded heating pulverizing system based on heat pipe technology and control method thereof
  • Graded heating pulverizing system based on heat pipe technology and control method thereof

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Embodiment 1

[0034] Such as figure 1 As shown, this embodiment provides a graded heating pulverization system based on heat pipe technology, which is divided into two stages of heating. The first stage of heating is hot primary air that passes through the coal mill to dry the raw coal and mixes and heats the pulverized coal during the process of conveying the pulverized coal. The secondary heating is to use the heat pipe technology to absorb the heat of the high-temperature hot primary air after the primary heating to further heat the pulverized coal transported. The system of this embodiment can basically eliminate or alleviate the problem of air powder energy mismatch before and after the coal pulverizer in the power plant boiler pulverizing system, and the problem that a certain amount of cold air needs to be mixed in order to reduce the temperature of the wind entering the coal pulverizer, and improve the efficiency of the boiler.

[0035] The graded heating pulverizing system includes...

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Abstract

The invention relates to a graded heating pulverizing system based on a heat pipe technology and a control method thereof. The system comprises a coal bunker, a coal feeder, a coal mill, a boiler, a heat pipe exchanger, a heat pipe exchanger condensation section heat exchange device, a heat pipe exchanger evaporation section heat exchange device, an air preheater and a primary fan; the heat pipe exchanger is connected with the heat pipe exchanger condensation section heat exchange device and the heat pipe exchanger evaporation section heat exchange device; the air preheater is installed at thesmoke exhaust end of the boiler and connected with the primary fan and the heat pipe exchanger evaporation section heat exchange device; and the heat pipe exchanger evaporation section heat exchangedevice is connected with the coal mill, and the heat pipe exchanger condensation section heat exchange device is connected with the outlet end of the coal mill and the boiler. Compared with the priorart, the graded heating pulverizing system based on the heat pipe technology and the control method thereof have the advantages that hot primary air energy is used for graded heating of pulverized coal through heat pipe heat exchange, the temperature of an air-pulverized coal mixture of a pulverized coal conveying system is increased, and then the boiler efficiency is improved.

Description

technical field [0001] The invention relates to the field of energy saving of large thermal power units, in particular to a heat pipe technology-based graded heating pulverization system and a control method thereof. Background technique [0002] Modern high-parameter and large-capacity thermal power generation units generally adopt positive pressure direct blowing pulverization system, and most thermal power units use medium-speed coal mills. The operation of pulverization system plays an important role in the operation of large-capacity unit units. The quality of the pulverizing system has a great impact on the efficiency of power plant boilers. And in reality, due to economic considerations, the power plant does not completely design coal types according to combustion, but blends a large number of coals, especially foreign low-quality lignite with low price. Blending low-quality lignite has high economic efficiency but It also brings a series of problems to the pulverizi...

Claims

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Application Information

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IPC IPC(8): B02C25/00B02C23/24B02C23/00F28D15/02
CPCB02C23/00B02C23/24B02C25/00F28D15/0266
Inventor 韩新海程智海王嘉颢
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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