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Heat transfer device and method for coal fired boiler flue gas containing sulfur trioxide

A technology of heat exchange device and coal-fired boiler, which is applied in the field of waste heat recovery and utilization of flue gas of power station boilers and industrial boilers, can solve the problems of condensation acid condensation, low temperature corrosion, etc., to reduce smoke velocity, prevent low temperature acid corrosion, and reduce smoke The effect of airflow

Active Publication Date: 2014-01-29
上海和衡能源科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The coal-fired boiler proposed by the present invention contains SO 3 The flue gas heat exchange device combines cooling and alkaline dust electrostatic adsorption technology to solve the problem of low-temperature corrosion caused by condensate condensation on the wall of the heat exchange device when the flue gas temperature is lowered below the acid dew point

Method used

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  • Heat transfer device and method for coal fired boiler flue gas containing sulfur trioxide
  • Heat transfer device and method for coal fired boiler flue gas containing sulfur trioxide
  • Heat transfer device and method for coal fired boiler flue gas containing sulfur trioxide

Examples

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Embodiment 1

[0041] Example 1 A utility boiler flue gas waste heat recovery and utilization system comprising the above-mentioned flue gas heat exchange device.

[0042] Replace one or more porous air flow distribution plates in the different-diameter flue interface (horn mouth) of the electrostatic precipitator with vertical or horizontal heat exchange tube bundles, and ground them as anode plates (dust collectors) and arrange them on the The cathode electrode (corona electrode) in front of it forms a dust electrostatic adsorption unit, in which:

[0043] The heat exchange tube can be a circular tube with an outer diameter of 20-50 mm, or an elliptical tube with a short outer diameter of 20-50 mm and a ratio of length to short diameter of 1-3. When using an elliptical tube, the long axis direction should be parallel to the air flow. The length of the heat pipe is determined according to the height of the inlet reducing flue interface when it is arranged vertically, and it is determined ...

Embodiment 2

[0050] Example 2 A utility boiler flue gas waste heat recovery and utilization system comprising the above-mentioned flue gas heat exchange device.

[0051] Replace one or more porous air distribution plates in the different-diameter flue interface (horn mouth) of the electrostatic precipitator with 2 to 4 pieces of flow equalizing tube plates with vertical or horizontal heat exchange tubes, and each flow equalizing tube plate It is perpendicular to the direction of the flue gas flow, the size is consistent with the section of the flue, and after being grounded, it is used as the anode plate (dust collector) and the cathode electrode (corona electrode) arranged in front of it to form a heat exchange dust electrostatic adsorption unit, wherein:

[0052] The heat exchange tube can be a circular tube with an outer diameter of 20-50 mm, or an elliptical tube with a short outer diameter of 20-50 mm and a ratio of length to short diameter of 1-3. When using an elliptical tube, the ...

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Abstract

The invention belongs to the technical field of recycling of flue gas waste heat of utility boilers and industrial boilers and particularly to a heat transfer device and a method for coal fired boiler flue gas containing sulfur trioxide. According to the heat transfer method for the coal fired boiler flue gas containing the sulfur trioxide, the heat transfer device which is arranged on the upper stream of an electric precipitator is divided into two areas namely a heat transfer pipe wall non-moisture-condensation area and a heat transfer pipe wall moisture condensation area; the flue gas firstly passes the non-moisture-condensation area, the temperature of the flue gas is controlled to be decreased to above an acid dew point, then the flue gas enters into the moisture condensation area and the temperature of the flue gas is controlled to be decreased by 5 to 15 DEG C to be under the acid dew point, and then the flue gas enters into the electric precipitator which is arranged on the lower stream to perform dust removal; a high voltage electric field is added to a heat exchange pipe bundle in the moisture condensation area and static electricity adsorbs dust to neutralize acid dew which is coagulated on heat exchange pipes. The heat transfer method for the coal fired boiler flue gas containing the sulfur trioxide has the advantages of removing the sulfur trioxide in the flue gas, reducing dust specific resistance and improving the dedusting efficiency; enabling the flue gas waste heat to be recycled to the largest extent and improving the economic performance; effectively preventing self-low-temperature-acid-corrosion of the heat transfer device; reducing power consumption and saving operating costs.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery and utilization of power station boilers and industrial boilers, and in particular relates to a flue gas heat exchange device and method for power station boilers and industrial boilers. Background technique [0002] Installing a heat exchange device upstream of the electrostatic precipitator to reduce the temperature of the flue gas at the inlet of the electrostatic precipitator can not only improve the efficiency of the electrostatic precipitator but also recover the waste heat of the flue gas. It is a commonly used energy-saving technical measure in coal-fired power plants. The recovered flue gas waste heat can be used for condensate heating in the steam turbine unit heat recovery system, boiler combustion air heating, building air conditioning heating and domestic hot water, etc. The system flow for the condensate water heating in the steam turbine unit heat recovery system is as fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/06F28F19/00F28G7/00B03C3/04
CPCY02E20/30
Inventor 曹绛敏章卫宋若槑王启杰
Owner 上海和衡能源科技发展有限公司