CN102506564A - Condensation water residual heat first-effect flash evaporation natural air dehumidifying, preheating and drying baking oven system - Google Patents
Condensation water residual heat first-effect flash evaporation natural air dehumidifying, preheating and drying baking oven system Download PDFInfo
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Abstract
The invention relates to a condensation water residual heat first-effect flash evaporation natural air dehumidifying, preheating and drying baking oven system. A baking oven is internally provided with a coil heat exchanger set; the outlet of the coil heat exchanger set is respectively provided with a water draining valve and is connected with a high-temperature condensation water pipe; the high-temperature condensation water accesses to a flash evaporation tank; flash evaporation steam enters a flash evaporation steam pipe from a constant-pressure overflow valve; one way of the outlet of the flash evaporation steam pipe is connected to a lithium bromide refrigerating machine, and the other way of the outlet of the flash evaporation steam pipe is connected to an air preheater through a front pressure automatic regulating valve; the refrigeration water outlet of the refrigerating machine is connected with the water inlet of a cooler of a superficial cooling mist extractor, and the water outlet of the cooler is connected with refrigeration water inlet of the lithium bromide refrigerating machine; and natural air accesses to the humid air inlet of the superficial cooling mist extractor, the dry air outlet of the superficial cooling mist extractor accesses into an air blower, and is sent into the air inlet of the baking oven through the air preheater by the air blower. The system not only can guarantee the drying degree of materials to achieve the technological requirements, but also the utilization efficiency of steam can be improved, and the dissipation of energy of unit product is reduced.
Description
Technical field
The present invention relates to a kind of drying oven, particularly a kind of condensed water waste heat one is imitated flash distillation natural air dehumidifying preheating and drying baking oven system.
Background technology
The air drying oven is provided with baking oven air inlet, baking oven gas outlet, wet stock import and dry material outlet; Generally include the coil heat exchanger group of many group parallel connections in the baking oven; Each coil heat exchanger group is formed in parallel by a plurality of coil heat exchangers; The import of each coil heat exchanger group links to each other with main steam pipe through steam stop respectively, and the outlet of each coil heat exchanger is respectively equipped with drain valve, and the outlet of each drain valve inserts total condensate pipe respectively.When vapor stream is crossed each coil heat exchanger and air heat exchange and after discharging latent heat, be condensed into the high-temperature condensation water under the uniform pressure, high-temperature condensation water enters total condensate pipe through each drain valve; Air gets into from the baking oven air inlet, the outer surface of each coil heat exchanger of flowing through, through with steam heat-exchanging after, become hot-air, hot-air carries out the wet exchange of heat with moist material, flows out the oven dry of realization material from the baking oven gas outlet after taking away the moisture of wet stock.
After high-temperature condensation water gets into total condensate pipe, along the continuous pressure drop of journey, part high-temperature condensation water flash-off of steam; Surplus the volumetric expansion 1600 times, flow velocity increases about 10 times, and causing prevailing in total condensate pipe is not condensed water; But flash-off steam very easily forms vapour locking; The back pressure of drain valve increases after the vapour locking, and drain valve two ends pressure reduction reduces, and the drain valve discharge capacity descends, and the condensed water that causes producing in the coil heat exchanger can not in time be got rid of, and heat exchanger efficiency descends, and hot air temperature can not reach technological requirement, thereby influences ordinary production.Produce for guaranteeing, often need open stop valve parallelly connected with drain valve and carry out in linely, the result is that it is mobile at total condensate pipe that steam leakage when discharging condensed water, steam head on condensed water, to overcome the vapour locking resistance; Though guaranteed production, steam utilization reduces, and the unit product steam consumption increases.Therefore existing systems or can not ordinary production, otherwise waste of steam is serious, and the condensed water sensible heat is not fully used.
Natural air is made up of dry air and steam, promptly contains moisture in the natural air, and especially humidity high season, water capacity can reach 20g/Nm
3More than, than expanding surplus in the of 1600 in liquid lower volume times, so the moisture in the natural air has occupied certain volume to water under gaseous state.The relative humidity of air reaches at 100% o'clock, and airborne moisture reaches capacity, and no longer has the ability of moisture absorption from material, and the air themperature of this moment is called dew-point temperature, and when air themperature dropped to dew-point temperature, airborne water vapour will condense into dew.The relative humidity of air is low more, and is strong more to the drying capacity of material.Baking oven in the course of the work; Blown in baking oven by air blast, air blast is also sent into steam in the baking oven when sending into dry air; Steam not only hinders the moisture absorption of air to material; Reduce the moisture pick-up properties of air, self go back behind the heat that the absorption coil heat exchanger discharges, wasted a large amount of heat energy as toxic emission; In addition, because the existence of steam, air blast need be sent into more air to satisfy the needs of the wet exchange of heat, has both increased power consumption, has increased the air draft heat loss again.
According to the second law of thermodynamics, heat can not spontaneously be transferred to high temp objects from cryogenic object, realize this process, must consume certain merit, just can make the temperature of cryogenic object lower, reaches the purpose of refrigeration.Lithium-bromide absorption-type refrigerating machine be a kind of be the refrigeration machine of power with the thermal source, mainly form by generator, condenser, evaporimeter, absorber four major parts and equipment such as heat exchanger and solution pump.Lithium bromide refrigerator inside is vacuum environment; For example the shell side of evaporimeter maintenance absolute pressure is 6.54mmHg; Water is 5 ℃ of boilings, and the water as refrigerant spirt is gone will explosive evaporation, when the tube side of the higher chilled water of temperature (for example the being 12 ℃) evaporimeter of flowing through; The water as refrigerant that sprays so outside copper pipe will and evaporate from copper pipe absorption heat, and the chilled water temperature in the copper pipe has just reduced (12 ℃ → 7 ℃); After the water as refrigerant evaporation; The pressure of evaporimeter will raise, and in order to keep the pressure very low (6.54mmHg) in the evaporimeter, absorber absorbs water vapour through the spray bromize lithium concentrated solution; Lithium-bromide solution behind the absorption water vapour becomes weak solution, and concentration reduces can not absorb steam again; Through generator weak solution is concentrated, it is thermal source that generator adopts steam usually, and weak solution is heated again, make the water evaporates in the weak solution after solution concentrated, keep absorbability; The isolated steam of generator is cooled off by cooling water in condenser indirectly, and the water as refrigerant of liquefy gets into the evaporimeter spray again, so moves in endless cycles.Therefore the external pipeline of lithium bromide refrigerator has chilled water import, chilled water outlet; Cooling water inlet, coolant outlet; Steam inlet, refrigeration machine condensation-water drain.
Summary of the invention
The objective of the invention is to; Overcome the problem that exists in the prior art; Provide a kind of condensed water waste heat one to imitate flash distillation natural air dehumidifying preheating and drying baking oven system; The degree of drying and the rate of drying that can guarantee material reach technological requirement, can improve the utilization ratio of steam again, reduce the energy consumption of unit product.
For solving above technical problem; Condensed water waste heat one provided by the present invention is imitated flash distillation natural air dehumidifying preheating and drying baking oven system; Comprise the air drying oven; Said air drying oven is provided with baking oven air inlet, baking oven gas outlet, wet stock import and dry material outlet; Be provided with the coil heat exchanger group that is formed in parallel by a plurality of coil heat exchangers in the baking oven, the import of each coil heat exchanger links to each other with main steam pipe through steam stop respectively, and the outlet of coil heat exchanger group is respectively equipped with drain valve; Also comprise flash tank, lithium bromide refrigerator, surface cool demister, air blast and air preheater; The drain valve outlet of each coil heat exchanger inserts the high-temperature condensation water pipe respectively, and the outlet of high-temperature condensation water pipe inserts the flash tank diffusion and produces flash steam, and flash steam gets into the flash distillation steam pipe by the level pressure overflow valve of flash drum overhead; The outlet one tunnel of said flash distillation steam pipe inserts the steam inlet of said lithium bromide refrigerator, and the preheater air intake of said air preheater is inserted on another road through preceding pressure automatic regulating valve; The chilled water outlet of lithium bromide refrigerator is connected with the cooler water inlet of said surface cool demister, and the cooler delivery port of surface cool demister is connected with the chilled water import of lithium bromide refrigerator; Natural air inserts the humid air inlet of surface cool demister after air cleaner filters; The dry air outlet of surface cool demister inserts said air blast; The outlet of air blast inserts the air inlet of said air preheater, and the air outlet of air preheater inserts the baking oven air inlet of said air drying oven.
With respect to prior art; The present invention has obtained following beneficial effect: (1) in the present invention, coil heat exchanger uses main steam, the high-temperature condensation water that is discharged inserts the flash distillation of flash tank diffusion; The pressure of flash steam is set through the level pressure overflow valve; Its temperature and pressure is lower than main steam, and flash steam is sent to air preheater the air that gets into baking oven is carried out preheating, improves the temperature and the moisture pick-up properties of air; (2) flash steam inserts lithium bromide refrigerator, has realized the cascade utilization of waste heat, guarantees that heat energy eats dried bleeding, and has totally kept the very high thermal efficiency.(3) chilled water that makes of lithium bromide refrigerator inserts the surface cool demister; The surface cool demister is united two into one by surface-cooler, demister and forms, and cryogenic freezing water gets into surface-cooler, carries out indirect heat exchange with the air of the surface-cooler of flowing through; The temperature of air is cooled to below the dew-point temperature; Airborne steam condenses into the globule, and flows into automatic rhone along the surface cooler wall, and the remaining water smoke of air quenched generation is then caught by demister and got into automatic rhone; The cooled dry air that dehumidifies gets into the inlet scoop of air blast, is sent to air preheater by air blast, and cooled drying-air temperature reduces, and density increases, and blower efficiency improves, and the unit air volume power consumption reduces; (4) air is through after drying, and moisture descends significantly, and dry air content increases, and has reduced air output, has also reduced the power consumption of air blast; (5) steam not only hinders the moisture absorption of air to material, reduces the moisture pick-up properties of air, self goes back behind the heat that the absorption coil heat exchanger discharges as toxic emission, has wasted a large amount of heat energy; Air is through after drying, and the water vapour amount that after the coil heat exchanger heating, is discharged in the atmosphere descends, and the air draft heat loss descends significantly; (6) dry air that comes out from air preheater gets into the baking oven, because its temperature is high, water capacity is low, wettability power is strong, and is better to the drying effect of material; (7) quantity of steam of air preheater use is regulated through preceding pressure automatic regulating valve, and when the pressure of steam supply of lithium bromide refrigerator was higher than setting value, preceding pressure automatic regulating valve aperture increased, and the flash steam amount of air supply preheater increases; When the pressure of steam supply of lithium bromide refrigerator was lower than setting value, preceding pressure automatic regulating valve aperture reduced, and the flash steam amount of air supply preheater reduces.
As preferred version of the present invention; The cryogenic condensation water of the preheater condensation-water drain of said air preheater, the refrigeration machine condensation-water drain of lithium bromide refrigerator and flash tank bottom all inserts condensate pump, and said condensed water delivery side of pump inserts condensation water recovery system.Water base of cryogenic condensation does not have pressure, is pressurised into subcooled water through condensate pump, along the Cheng Buzai flash distillation, has avoided vapour locking; And condensate temperature is low more, and thermal loss is more little in the course of conveying.
As preferred version of the present invention, said condensate pump is the steam-operating condensate pump, and said main steam pipe is connected with the vapor interface of said steam-operating condensate pump through steam stop.Adopting the steam-operating condensate pump can make system of the present invention not rely on electric power can move.
As preferred version of the present invention, said coil heat exchanger group is provided with between many groups and each group parallel with one another in said baking oven.Can be according to the size of load, the group number that comes into operation of selective pan heat exchange of heat pipe group.
As preferred version of the present invention, the front and back of each said drain valve are respectively equipped with the condensed water stop valve.After opening the condensed water stop valve before and after the drain valve, drain valve is started working, and closes the condensed water stop valve before and after the drain valve, just can safeguard or changes drain valve, does not influence the operation of system; Can also close the steam stop of certain coil heat exchanger and the condensed water stop valve before and after the drain valve as required simultaneously, end the operation of this coil heat exchanger.
As preferred version of the present invention, the flash tank condensed water import of said flash tank also is connected with other heat exchanger drain valve outlet nearby.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation, accompanying drawing only provides reference and explanation usefulness, and is non-in order to restriction the present invention.
Fig. 1 is imitated the sketch map of flash distillation natural air dehumidifying preheating and drying baking oven system for condensed water waste heat one of the present invention.
Among the figure: 1 main steam pipe; 2 air drying ovens; 2a baking oven air inlet; 2a ' baking oven gas outlet; The import of 2b wet stock; The outlet of 2b ' dry material; 3 coil heat exchangers; The 3a steam stop; The 3b drain valve; 3c condensed water stop valve; 4a high-temperature condensation water pipe; 4b cryogenic condensation water pipe; 5 flash tanks; The import of 5a flash tank condensed water; 5b level pressure overflow valve; Other condensed waters of 5c; 7 flash distillation steam pipes; Press automatic regulating valve before the 7a; 9 lithium bromide refrigerators; The import of 9a chilled water; 9a ' chilled water outlet; The 9b cooling water inlet; 9b ' coolant outlet; The 9c steam inlet; 9c ' refrigeration machine condensation-water drain; 10 cooling towers; 10a cooling tower upper hose; 10a ' cooling tower outlet pipe; 11 surface cool demisters; 11a cooler water inlet; 11a ' cooler delivery port; 11b humid air inlet; The outlet of 11b ' dry air; The automatic rhone of 11c; 12 air cleaners; 13 air blasts; 14 air preheaters; The 14a air inlet; 14a ' air outlet; 14b preheater air intake; 14b ' preheater condensation-water drain; 15 condensate pumps; 15a pump vapor interface; 16 condensation water recovery systems.
The specific embodiment
Condensed water waste heat of the present invention one as shown in Figure 1 is imitated flash distillation natural air dehumidifying preheating and drying baking oven system; Comprise air drying oven 2, flash tank 5, lithium bromide refrigerator 9, surface cool demister 11, air blast 13 and air preheater 14, air drying oven 2 is provided with baking oven air inlet 2a, baking oven gas outlet 2a ', wet stock import 2b and dry material outlet 2b '.Be provided with the coil heat exchanger group in the baking oven, the coil heat exchanger group can also can be organized parallel connection for one group more.Each coil heat exchanger group is formed in parallel by a plurality of coil heat exchangers 3; The import of each coil heat exchanger 3 links to each other with main steam pipe 1 through steam stop 3a respectively; The outlet of coil heat exchanger group is respectively equipped with drain valve 3b, and the front and back of each drain valve 3b are respectively equipped with condensed water stop valve 3c.
Each drain valve 3b outlet inserts high-temperature condensation water pipe 4a respectively; The outlet of high-temperature condensation water pipe 4a inserts the flash tank condensed water import 5a of flash tank 5, and higher other condensed waters 5c of temperature that other heat exchangers nearby produce also can get into one and imitate flash tank 5 flash distillation utilizations.
The level pressure overflow valve 5b outlet at flash tank 5 tops gets into flash distillation steam pipe 7, and the outlet one tunnel of flash distillation steam pipe 7 inserts the steam inlet 9c of lithium bromide refrigerator 9, and the preheater air intake 14b of air preheater 14 is inserted on another road through preceding pressure automatic regulating valve 7a.The quantity of steam that air preheater 14 uses is regulated through preceding pressure automatic regulating valve 7a, and when the pressure of steam supply of lithium bromide refrigerator 9 was higher than setting value, preceding pressure automatic regulating valve 7a aperture increased, and the flash steam amount of air supply preheater increases; When the pressure of steam supply of lithium bromide refrigerator 9 was lower than setting value, preceding pressure automatic regulating valve 7a aperture reduced, and the flash steam amount of air supply preheater reduces.
The chilled water outlet 9a ' of lithium bromide refrigerator 9 is connected with the cooler water inlet 11a of surface cool demister 11, and the cooler delivery port 11a ' of surface cool demister 11 is connected with the chilled water import 9a of lithium bromide refrigerator 9; The heat that heat that the steam condensation is discharged in the lithium bromide refrigerator 9 and chilled water cooling are discharged is taken away by cooling water; The coolant outlet 9b ' of lithium bromide refrigerator 9 is connected with the cooling tower upper hose 10a of cooling tower 10, and cooling tower outlet pipe 10a ' is connected with the cooling water inlet 9b of lithium bromide refrigerator 9.
The outlet of air cleaner 12 inserts the humid air inlet 11b of surface cool demister 11; The dry air outlet 11b ' of surface cool demister 11 inserts air blast 13; The outlet of air blast 13 inserts the air inlet 14a of air preheater 14, and the air outlet 14a ' of air preheater 14 inserts the baking oven air inlet 2a of air drying oven 2.
The cryogenic condensation water of the preheater condensation-water drain 14b ' of air preheater 14, the refrigeration machine condensation-water drain 9c ' of lithium bromide refrigerator 9 and flash tank 5 bottoms inserts condensate pump 15 through cryogenic condensation water pipe 4b respectively, and the outlet of condensate pump 15 inserts condensation water recovery system 16.Condensate pump 15 is preferably the steam-operating condensate pump, and main steam pipe 1 is connected with the pump vapor interface 15a of steam-operating condensate pump through steam stop.
During work; Natural air gets into surface cool demister 11 after air cleaner 12 filters; Surface cool demister 11 is united two into one by surface-cooler, demister and forms, and cryogenic freezing water gets into surface-cooler, carries out indirect heat exchange with the air of the surface-cooler of flowing through; The temperature of air is cooled to below the dew-point temperature; Airborne steam condenses into the globule, and flows into automatic rhone 11c along the surface cooler wall, and the remaining water smoke of air quenched generation is then caught by demister and got into automatic rhone 11c.Cold air after drying is sent into air preheater 14 by air blast 13; Air after the preheating gets into baking oven, the outer surface of each coil heat exchanger 3 of flowing through, through with steam heat-exchanging after; Temperature further raises; Hot-air carries out the wet exchange of heat with moist material, and 2a ' flows out from the baking oven gas outlet after taking away the moisture of wet stock, the oven dry of realization material.
In air drying oven 2; When vapor stream is crossed each coil heat exchanger 3 and air heat exchange and after discharging latent heat; Be condensed into the high-temperature condensation water under the uniform pressure, high-temperature condensation water enters total condensate pipe through each drain valve 3b, gets into flash tank 5 diffusions then and produces flash steam; Flash steam flows out back one tunnel entering air preheater 14 by the level pressure overflow valve 5b at flash tank 5 tops, and another road gets into lithium bromide refrigerator 9.The cryogenic condensation water that air preheater 14, lithium bromide refrigerator 9 and flash tank 5 produce pumps into condensation water recovery system 16 through condensate pump 15 respectively.
The above person is merely the present invention's preferable possible embodiments, and is non-so limit to claim of the present invention; Except that the foregoing description, the present invention can also have other embodiments, for example; Air heater is set before air blast, and the high-temperature cooling water that from lithium bromide refrigerator, comes out is at first delivered to air heater, in air heater; High-temperature cooling water and cold air carry out indirect heat exchange, and the temperature of cold air is able to promote, and temperature descends after the high-temperature cooling water release heat; Get into the cooling tower cooling again, the cooling water after the cooling tower cooling flows out from the cooling tower outlet pipe, gets into the cooling water inlet of lithium bromide refrigerator again; Air heater had both reclaimed the waste heat of high-temperature cooling water, and the cold air temperature is got a promotion, and had alleviated the load of cooling tower again; Strengthen the cooling water outlet and inlet temperature difference of lithium bromide refrigerator, reduced the power consumption of blower fan of cooling tower, can alleviate the power consumption of cooling water circulating pump again.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Claims (6)
1. a condensed water waste heat one is imitated flash distillation natural air dehumidifying preheating and drying baking oven system; Comprise the air drying oven; Said air drying oven is provided with baking oven air inlet, baking oven gas outlet, wet stock import and dry material outlet; Be provided with the coil heat exchanger group that is formed in parallel by a plurality of coil heat exchangers in the baking oven, the import of each coil heat exchanger links to each other with main steam pipe through steam stop respectively, and the outlet of coil heat exchanger group is respectively equipped with drain valve; It is characterized in that: also comprise flash tank, lithium bromide refrigerator, surface cool demister, air blast and air preheater; The drain valve outlet of each coil heat exchanger inserts the high-temperature condensation water pipe respectively, and the outlet of high-temperature condensation water pipe inserts the flash tank diffusion and produces flash steam, and flash steam gets into the flash distillation steam pipe by the level pressure overflow valve of flash drum overhead; The outlet one tunnel of said flash distillation steam pipe inserts the steam inlet of said lithium bromide refrigerator, and the preheater air intake of said air preheater is inserted on another road through preceding pressure automatic regulating valve; The chilled water outlet of lithium bromide refrigerator is connected with the cooler water inlet of said surface cool demister, and the cooler delivery port of surface cool demister is connected with the chilled water import of lithium bromide refrigerator; Natural air inserts the humid air inlet of surface cool demister after air cleaner filters; The dry air outlet of surface cool demister inserts said air blast; The outlet of air blast inserts the air inlet of said air preheater, and the air outlet of air preheater inserts the baking oven air inlet of said air drying oven.
2. condensed water waste heat one according to claim 1 is imitated flash distillation natural air dehumidifying preheating and drying baking oven system; It is characterized in that: the cryogenic condensation water of the preheater condensation-water drain of said air preheater, the refrigeration machine condensation-water drain of lithium bromide refrigerator and flash tank bottom all inserts condensate pump, and said condensed water delivery side of pump inserts condensation water recovery system.
3. condensed water waste heat one according to claim 2 is imitated flash distillation natural air dehumidifying preheating and drying baking oven system; It is characterized in that: said condensate pump is the steam-operating condensate pump, and said main steam pipe is connected with the vapor interface of said steam-operating condensate pump through steam stop.
4. condensed water waste heat one according to claim 1 is imitated flash distillation natural air dehumidifying preheating and drying baking oven system, and it is characterized in that: said coil heat exchanger group is provided with between many groups and each group parallel with one another in said baking oven.
5. condensed water waste heat one according to claim 1 is imitated flash distillation natural air dehumidifying preheating and drying baking oven system, and it is characterized in that: the front and back of each said drain valve are respectively equipped with the condensed water stop valve.
6. imitate flash distillation natural air dehumidifying preheating and drying baking oven system according to each described condensed water waste heat one in the claim 1 to 5, it is characterized in that: the flash tank condensed water import of said flash tank also is connected with other heat exchanger drain valve outlet nearby.
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| CN2011104471077A CN102506564B (en) | 2011-12-28 | 2011-12-28 | Condensation water residual heat first-effect flash evaporation natural air dehumidifying, preheating and drying baking oven system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102889577A (en) * | 2012-10-17 | 2013-01-23 | 亿恒节能科技江苏有限公司 | External dry steam flash evaporation two-effect heat exchange system |
| CN102889579A (en) * | 2012-10-17 | 2013-01-23 | 亿恒节能科技江苏有限公司 | Inner drying steam flash evaporating double-effect heat exchanging system |
| CN102889576A (en) * | 2012-10-17 | 2013-01-23 | 亿恒节能科技江苏有限公司 | Low-humidity steam double-effect heat exchange system |
| CN102901086A (en) * | 2012-10-17 | 2013-01-30 | 亿恒节能科技江苏有限公司 | Internal dried steam three-effect heat exchange system |
| CN104082887A (en) * | 2014-07-30 | 2014-10-08 | 山东宏信化工股份有限公司 | Drying device for preparation of PVC plastic glove |
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| CN109029045A (en) * | 2018-07-17 | 2018-12-18 | 九三粮油工业集团有限公司 | A kind of tempering tower high-temperature condensation water efficient heat energy is using system and utilizes method |
| CN110657660A (en) * | 2019-10-31 | 2020-01-07 | 西安唐泰节能环保科技有限公司 | Dry heat recovery equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102889577A (en) * | 2012-10-17 | 2013-01-23 | 亿恒节能科技江苏有限公司 | External dry steam flash evaporation two-effect heat exchange system |
| CN102889579A (en) * | 2012-10-17 | 2013-01-23 | 亿恒节能科技江苏有限公司 | Inner drying steam flash evaporating double-effect heat exchanging system |
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| CN109029045A (en) * | 2018-07-17 | 2018-12-18 | 九三粮油工业集团有限公司 | A kind of tempering tower high-temperature condensation water efficient heat energy is using system and utilizes method |
| CN110657660A (en) * | 2019-10-31 | 2020-01-07 | 西安唐泰节能环保科技有限公司 | Dry heat recovery equipment |
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| CN114674136A (en) * | 2022-04-20 | 2022-06-28 | 广东省迅怡净化科技有限公司 | Efficient, environment-friendly and energy-saving drying device |
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