Method and device for recovering waste heat from high-temperature dusty flue gas with molten dust self-cleaning function
A recovery device and flue gas waste heat technology, applied in the direction of indirect heat exchangers, heat exchanger types, heat exchange equipment, etc., can solve the problems of difficult recovery and utilization of waste heat, uneven heating of the wall surface, and reduced heat exchange efficiency, etc., to achieve suitable The effect of wide temperature range, low operating cost and simple structure
Active Publication Date: 2019-08-06
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0002] A large amount of high-temperature flue gas is produced in the process industry. The waste heat of the high-temperature flue gas is high-grade and has a high recovery value. However, because it contains a large amount of dust and is corrosive, the flue gas temperature is high, and there are tar and phenolic substances, which may easily cause boiler heating surfaces and Dust accumulation, corrosion, wear and other problems in the dust removal system make it difficult to effectively recycle the waste heat, and the waste heat recovery rate is low
[0003] The high-temperature dust-laden flue gas is in a melting or partially melting state under high-temperature conditions, and deposits on the water-cooled wall or superheater to form slagging, which will increase the thermal resistance of the heating surface, reduce the heat transfer efficiency, and seriously affect the economy; The wall surface is heated unevenly, causing thermal stress and damaging the pipe on the heating surface
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Embodiment 2
[0053] Such as image 3 and Figure 4 As shown, another embodiment of the present invention is a high-temperature dust-laden flue gas waste heat recovery device with molten dust self-cleaning function, and figure 1 , figure 2 In contrast, the bottom of the flue gas heat exchange channel in this example is a double-slope heat insulation layer, the middle of the slope is high, the sides are low, and the sides of the slope are slag outlets. The molten slag flows from the middle to both sides along the heat insulating layer of the bottom surface, and is discharged from the slag discharge port 19 .
[0054] The diameter of the medium inlet and medium outlet pipes is 200mm; the diameter of the flue gas inlet 1 and the flue gas outlet 5 pipes are both 980mm; the length of the flue gas inlet connector and the flue gas outlet connector are both 600mm; the cross-sectional size of the flue gas heat exchange channel The height is 1200mm, the diameter of the heat exchange tube bundle i...
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The invention provides a high-temperature dust-laden gas waste heat recycling method and device with a molten dust self-cleaning function, and belongs to the technical field of dust-laden gas filtering and purifying. The device comprises a flue gas inlet, a flue gas inlet connector, a flue gas heat exchange channel, a flue gas outlet connector, a flue gas outlet, a down-flow section heat exchangemedium inlet, a down-flow section heat exchange medium inlet connector, a down-flow section heat exchange medium inlet air box, a down-flow section flow distribution adjusting valve, a down-flow section tube bank flow distribution box, a counter-flow section heat exchange medium inlet, a counter-flow section heat exchange medium inlet air box, heat exchange tube bundles, a lower air box, a heat exchange medium outlet air box, a heat exchange medium outlet connector, a heat exchange medium outlet and oblique plate slag outlets. By the method of the device, high-temperature waste heat recyclingand coagulation and gathering of coagulated flue gas dust on the surfaces of the heat exchange tube bundles are realized; and the thickness of the solidified and slagged molten dust is controlled, andthe circumstance that flue gas flowing resistance is over large due to an over-thick slag layer is avoided. Therefore, the purposes of recycling high-temperature flue gas dust waste heat, automatically cleaning slag and protecting heat exchange tubes are achieved.
Description
technical field [0001] The present invention relates to the technical field of dust-laden gas filtration and purification, in particular to a method and device for recovering waste heat from high-temperature dust-laden flue gas with the function of self-cleaning molten dust. Background technique [0002] A large amount of high-temperature flue gas is produced in the process industry. The waste heat of the high-temperature flue gas is high-grade and has a high recovery value. However, because it contains a large amount of dust and is corrosive, the flue gas temperature is high, and there are tar and phenolic substances, which may easily cause boiler heating surfaces and Dust accumulation, corrosion, wear and other problems in the dust removal system make it difficult to effectively recycle the waste heat, and the waste heat recovery rate is low. [0003] The high-temperature dust-laden flue gas is in a melting or partially melting state under high-temperature conditions, and ...
Claims
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IPC IPC(8): F28D7/16F28F27/00
CPCF28D7/1653F28F27/00
Inventor 王立尹少武刘传平童莉葛杜建平
Owner UNIV OF SCI & TECH BEIJING