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Device for recovering and utilizing waste heat generated by smoke discharging in split type heating medium circulating way

A waste heat recovery and recycling technology, used in heat exchange equipment, indirect heat exchangers, lighting and heating equipment, etc.

Inactive Publication Date: 2012-03-21
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

[0003] There are two deficiencies in the existing split heat medium circulation exhaust heat recovery and utilization devices at home and abroad. One is that the heat medium used is water. In cold areas, the water will freeze when the equipment is out of service for maintenance or the water will freeze and block the pipeline when the equipment is not operating properly; secondly, most of the heat transfer tubes used in the heat exchanger are circular tube spiral fin heat transfer tubes, see Figure 2

Method used

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  • Device for recovering and utilizing waste heat generated by smoke discharging in split type heating medium circulating way
  • Device for recovering and utilizing waste heat generated by smoke discharging in split type heating medium circulating way
  • Device for recovering and utilizing waste heat generated by smoke discharging in split type heating medium circulating way

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Experimental program
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Effect test

Embodiment 1

[0017] It is used as a tubular flue gas-clean flue gas heat exchanger (tubular GGH) in the flue gas limestone-gypsum wet desulfurization system. At present, the most widely used desulfurization process in large coal-fired power plants is the limestone-gypsum wet desulfurization process. The flue gas temperature is generally around 45-50°C, so a flue gas-clean flue gas heat exchanger (GGH) is usually installed in this process. In the GGH, on the one hand, the untreated flue gas entering the absorption tower is transferred from ~130°C is lowered to about 90°C. On the other hand, the clean flue gas after washing, desulfurization and demisting is heated from about 50°C to 80°C and sent into the chimney to be discharged into the atmosphere.

[0018] The present invention can be used as a tubular GGH in a limestone-gypsum wet desulfurization system. Heat medium low temperature heat transfer oil. The heat-absorbing heat exchanger 1 of the present invention is used as a flue gas coo...

Embodiment 2

[0024] The heat release heat exchanger 2 of the present invention is used to preheat the combustion air entering the boiler to replace the air heater.

[0025] Place the heat-absorbing heat exchanger 1 of the present invention in the exhaust flue of the boiler to absorb the waste heat of exhaust smoke, place the heat-releasing heat exchanger 2 of the present invention at the heater of the boiler, and use the absorbed waste heat for preheating Combustion air entering the boiler, instead of the heater. Conventional air heaters need to use steam to heat the combustion air, which results in a significant increase in coal consumption of the unit. Since the circulating heat medium in the present invention is low-temperature heat-conducting oil, even in cold northern regions, when the ambient temperature is as low as -30°C to -50°C, safe work can still be guaranteed. In a word, in the cold region of the north, considering the two aspects of safety and economy, it is the best choice to...

Embodiment 3

[0027] The heat release heat exchanger of the present invention is used for preheating gas (natural gas or liquefied petroleum gas, etc.) of a gas furnace.

[0028] Heat-absorbing heat exchanger 1 of the present invention is placed in the exhaust flue of furnace kiln to absorb the waste heat of smoke exhaust, heat release heat exchanger 2 of the present invention is placed in the gas supply pipeline of furnace kiln, the waste heat absorbed It is used to preheat the gas (natural gas or liquefied petroleum gas, etc.) entering the kiln. The gas of the conventional gas-fired kiln is directly supplied, which causes a significant increase in the energy consumption of the unit. From an economic point of view, using the exhaust heat of the kiln to preheat the gas can achieve obvious economic benefits, see Figure 7 11 among the figure is a gas furnace, and 12 is an expansion tank.

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Abstract

The invention discloses a device for recovering and utilizing waste heat generated by smoke discharging in a split type heating medium circulating way, which comprises a heat absorbing and exchanging device, a heat releasing and exchanging device, and a connection pipeline and a circulation pump filled with heating medium heat conduction liquid, and is characterized in that low-temperature heat conduction oil is adopted as the heating medium heat conduction liquid, is used for absorbing the waste heat of the smoke in an exit flue, is delivered to the heat releasing and exchanging device through the connection pipeline after absorbing the waste heat, and is delivered to gas media needing the waste heat by the heat releasing and exchanging device, thereby recovering and utilizing the waste heat; and the heat absorbing and exchanging device and the heat releasing and exchanging device are tube type heat exchangers adopting oval tube H-shaped fin heat pipes. Heat conduction oil is used as the heating media to replace water, so that the device is applicable to cold regions, the temperature of which ranges from minus 30 DEG C to minus 50 DEG C, is not solidified when equipment is stopped for overhaul, and does not need to be heated additionally; and by adopting the tube type heat exchanger adopting the oval tube H-shaped fin heat pipe, the flow resistance at a smoke or gas side is small, the energy consumption is low, and the self-deashing effect is better, thereby preventing a smoke channel from being blocked.

Description

technical field [0001] The invention relates to an energy-saving system for recovering and utilizing exhaust waste heat, in particular to a split heat medium circulation type exhaust exhaust heat recovery and utilization device. Background technique [0002] At present, various power plant boilers in the power generation industry, various industrial boilers used in industry, blast furnace blast furnaces and coking coal furnaces in the metallurgical steelmaking industry, and various drying furnaces in the building materials industry and textile industry carry a large amount of waste heat every day. The flue gas is exhausted to the atmosphere, causing extremely serious energy loss. For example, for large bituminous coal boiler units, the design value of boiler exhaust gas temperature is usually about 125°C; for lean coal and anthracite boiler units, the design value of boiler exhaust temperature is usually about 140°C; for high-moisture lignite boiler units, the boiler exhaust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D15/00F28F1/36F23L15/00
CPCY02E20/34
Inventor 王启杰宋若槑章卫
Owner 上海和衡能源科技发展有限公司
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