CN210773604U - Phase-change heat recovery device suitable for recovering waste heat of low-grade damp and hot waste gas - Google Patents
Phase-change heat recovery device suitable for recovering waste heat of low-grade damp and hot waste gas Download PDFInfo
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- CN210773604U CN210773604U CN201920662118.9U CN201920662118U CN210773604U CN 210773604 U CN210773604 U CN 210773604U CN 201920662118 U CN201920662118 U CN 201920662118U CN 210773604 U CN210773604 U CN 210773604U
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Abstract
A phase change heat recoverer suitable for recovering waste heat of low-grade damp-heat waste gas comprises: the phase-change cross type heat exchanger core is arranged in the shell; a drying room exhaust damp and hot waste gas inlet, a cooled and dehumidified waste gas outlet, a fresh air inlet and a heated fresh air outlet connecting pipe are arranged on the side surface of the shell; the bottom of the shell is provided with an outlet connecting pipe for condensed water; the phase change cross type heat exchanger core comprises a heat exchanger and a first channel, a second channel, a third channel and a fourth channel which are respectively communicated with the heat exchanger, wherein the first channel and the third channel are communicated through the heat exchanger, and the second channel and the fourth channel are communicated through the heat exchanger; the phase change cross type heat exchanger core and the shell form a first cavity, a second cavity, a third cavity and a fourth cavity which are isolated from each other; simple and reliable structure, strong adaptability and good heat recovery effect.
Description
The technical field is as follows:
the utility model belongs to the heat recovery field relates to a phase transition heat recovery device suitable for low-grade damp and hot waste gas waste heat recovery.
Background art:
along with the increasing environmental awareness, the recycling of waste gas waste heat is more and more important in various industries, and in the field of waste gas waste heat recycling, low-temperature waste gas and flue gas with the temperature lower than 400 ℃ belong to low-grade waste heat, and particularly, the waste gas and flue gas with the temperature lower than 100 ℃ are extremely low-grade waste heat.
The low-grade waste heat is generally an unappreciated waste gas energy source, although the energy quality is low or the density is low, the low-grade waste heat is an important component for energy conservation and emission reduction, and a large amount of low-grade waste gas energy sources exist in social production, so that the low-grade waste heat has important practical significance for the research and development of other heat utilization application technologies.
The main component of the discharged substances of the baking rooms and the drying rooms is damp and hot air, the grade of the contained heat is extremely low, and the low-grade waste heat is difficult to recycle or has high recycling cost and is directly discharged into the atmosphere in large quantity in the prior art. In order to reduce the air humidity in the baking room and the baking room, fresh air (fresh air) with lower humidity needs to be continuously supplemented, so that the thermal efficiency of the baking room and the baking room is extremely low.
The prior art adopts traditional heat exchanger technique to carry out heat recovery to the higher damp and hot waste gas of temperature, utilizes traditional heat exchanger to transmit the heat of the high temperature and high humidity waste gas of baking house exhaust for the new trend, and the temperature of new trend reachs the baking house after rising, improves the energy utilization of baking house.
For low-grade damp and hot waste gas with the temperature lower than 100 ℃, effective waste heat recovery is difficult to achieve by adopting the traditional heat exchanger technology, particularly, the temperature of a large amount of discharged damp and hot waste gas is generally lower than 70 ℃ because the drying temperature of drying rooms and baking rooms of grains, fruits, vegetables, traditional Chinese medicinal materials, tobacco leaves and wood cannot be too high, and the technology capable of recovering the low-grade waste damp and hot gas at present comprises a heat pump technology and a total heat exchanger technology.
The scheme that the wet and hot waste gas is cooled by water in a condenser, the temperature of the wet and hot waste gas is reduced, the wet waste gas is dehumidified by condensation, and the dehumidified waste gas enters a drying room again for circulation mainly is dehumidification, and the heat recovery ratio is low.
The heat recovery baking technology for the humid and hot air of the baking room and the drying room by adopting the heat pump technology has the problems that:
the structure is complex, the used parts are more, and the investment cost is high; in addition, the system needs high-power stable power supply, when the power fluctuation is large, the system is easy to break down, the system is difficult to operate normally, the baking rooms are often in scattered towns, and the power condition heat pump technology is difficult to adapt.
The core component of the total heat exchanger is a total heat exchange core body, and the damp and hot air exhausted from the room and the fresh air fed from the outside exchange the temperature through the heat transfer plates and the humidity through the micropores on the plates, so that the effects of ventilating and keeping the temperature and the humidity in the room stable are achieved. This is the total heat exchange process. The total heat exchanger technology is effective for sensible heat recovery in low-grade waste gas waste heat, but cannot dehumidify. Therefore, the total heat exchanger technology can be used in a ventilation air conditioning system, and is not suitable for being used in a drying room and a curing room system.
The heat recovery effect is not ideal in the scheme that the condenser is used for cooling the damp and hot waste gas by water, the temperature of the damp and hot waste gas is reduced, the damp is removed by condensation, and the dehumidified waste gas enters the drying room again for circulation, and the moisture content of the dehumidified recycled waste gas is still high.
The utility model has the following contents:
to the defect that exists among the prior art, the utility model provides a phase transition heat recovery device suitable for low-grade damp and hot waste gas waste heat recovery, its phase transition heat recovery technique that is applicable to low-grade damp and hot waste gas waste heat recovery.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a phase change heat recoverer suitable for recovering waste heat of low-grade damp-heat waste gas comprises: the phase-change cross type heat exchanger core is arranged in the shell; a drying room exhaust damp and hot waste gas inlet, a cooled and dehumidified waste gas outlet, a fresh air inlet and a heated fresh air outlet connecting pipe are arranged on the side surface of the shell; the bottom of the shell is provided with an outlet connecting pipe for condensed water; the phase change cross type heat exchanger core comprises a heat exchanger and a first channel, a second channel, a third channel and a fourth channel which are respectively communicated with the heat exchanger in a universal mode, wherein the first channel and the third channel are communicated through the heat exchanger in the universal mode, and the second channel and the fourth channel are communicated through the heat exchanger in the universal mode; the phase change cross type heat exchanger core and the shell form a first cavity, a second cavity, a third cavity and a fourth cavity which are isolated from each other; the shell and the phase change cross type heat exchanger core are combined to form two paths for gas circulation, and the first path is as follows: the drying room is provided with a damp and hot waste gas inlet, a first cavity, a first channel, a heat exchanger, a third channel, a third cavity and a waste gas outlet after temperature reduction and dehumidification; the second path is: the fresh air inlet, the second cavity, the second channel, the heat exchanger, the fourth channel, the fourth cavity and the outlet connecting pipe of the heated fresh air.
Furthermore, a drying room exhaust damp and hot waste gas inlet is arranged at the lower part of the right side of the shell, a waste gas outlet after temperature reduction and dehumidification is arranged at the upper part of the left side of the shell, a fresh air inlet is arranged at the upper part of the right side of the shell, and an outlet connecting pipe of heated fresh air is arranged at the lower part of the left side of the shell.
Furthermore, an axial flow fan for pumping damp and hot waste gas is arranged in the damp and hot waste gas outlet of the drying room.
Furthermore, an exhaust axial flow fan is arranged in the exhaust outlet after temperature reduction and dehumidification.
Furthermore, an axial flow fan for sucking ambient air is arranged in the fresh air inlet.
Further, an axial fan is arranged in the outlet connecting pipe of the heated fresh air.
Furthermore, the phase change cross type heat exchanger core is divided into the four channels in a diagonal form, and a heat exchanger is arranged in the middle of the four channels.
By adopting the technical scheme, when the fresh air and the damp-heat gas discharged from the drying room exchange heat in the heat exchanger, the temperature is far lower than the temperature of the damp-heat gas discharged from the drying room because the fresh air comes from the current natural environment temperature, the heat exchanger can rapidly cool the damp-heat gas, the temperature of the fresh air can rise, and the heat exchange is sensible heat exchange; the relative humidity of the damp-heat air from the drying room is very high and approaches to the saturation humidity, so that in the process of temperature reduction of the damp-heat air in the heat exchanger, the contained water vapor can be changed into liquid phase from gas phase and condensed into water, and phase change occurs. The condensed water is discharged from the condensed water outlet pipe. In the process, the damp and hot waste gas can release phase change heat, and the heat is also transferred to the fresh air, so that the temperature of the fresh air is increased, namely the scheme not only recovers the sensible heat in part of the low-grade damp and hot waste gas, but also recovers part of latent heat, and improves the heat recovery efficiency. The scheme has the advantages of simple and reliable structure, strong adaptability and good heat recovery effect.
Description of the drawings:
the accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
The specific implementation mode is as follows:
in order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, is an embodiment of the present invention. A phase change heat recoverer suitable for recovering waste heat of low-grade damp-heat waste gas comprises: the phase-change cross type heat exchanger comprises a shell 1, wherein a phase-change cross type heat exchanger core 2 is arranged in the shell 1; a drying room damp and hot exhaust gas outlet 11, a cooled and dehumidified exhaust gas outlet 12, a fresh air inlet 13 and a heated fresh air outlet connecting pipe 14 are arranged on the side surface of the shell 1; the bottom of the shell 1 is provided with a condensed water outlet connecting pipe 15; the phase change cross type heat exchanger core 2 comprises a heat exchanger 21 and first, second, third and fourth channels 22, 23, 24 and 25 which are respectively communicated with the heat exchanger 21, wherein the first and third channels 22 and 24 are communicated through the heat exchanger 21, and the second and fourth channels 23 and 25 are communicated through the heat exchanger; the phase change cross type heat exchanger core 2 and the shell 1 are provided with four first, second, third and fourth cavities 3, 5, 4 and 6 which are isolated from each other; the shell 1 and the phase change cross type heat exchanger core 2 are combined to form two paths for gas circulation, and the first path is as follows: the drying room is provided with a damp and hot exhaust gas inlet 11, a first cavity 3, a first channel 22, a heat exchanger 21, a third channel 24, a third cavity 4 and a temperature-reduced and dehumidified exhaust gas outlet 12; the second path is: a fresh air inlet 13, a second cavity 5, a second channel 23, a heat exchanger 21, a fourth channel 25, a fourth cavity 6 and a heated fresh air outlet connecting pipe 14.
In a specific embodiment, a drying room exhaust damp and hot exhaust gas inlet 11 is arranged at the lower part of the right side of the casing 1, an exhaust gas outlet 12 after temperature reduction and dehumidification is arranged at the upper part of the left side of the casing 1, a fresh air inlet 13 is arranged at the upper part of the right side of the casing 1, and an outlet connecting pipe 14 for heated fresh air is arranged at the lower part of the left side of the casing 1.
In addition, an axial flow fan 71 for sucking the damp and hot exhaust gas may be provided in the inlet 11 for discharging the damp and hot exhaust gas from the drying room. An axial flow fan 72 for exhausting air is provided in the exhaust outlet 12 after temperature reduction and dehumidification. An axial fan 73 for sucking ambient air is provided in the fresh air inlet 13. An axial fan 74 is provided in the outlet connection pipe 14 of the heated fresh air.
The phase change cross type heat exchanger core 2 is divided into four channels in a diagonal form, and a heat exchanger 21 is arranged in the middle of the four channels.
The technical principle of the utility model is that: the damp and hot waste gas flow coming out of the moisture discharging ports of the drying room and the baking room enters the cavity after being pressurized from a damp and hot waste gas inlet at the lower part of the right side of the shell through an axial flow fan, then flows into a damp and hot waste gas side flow channel of the heat exchanger core from the end A of the phase-change cross type heat exchanger core, flows out of the end C of the heat exchanger core through heat exchange and phase-change dehumidification, enters the air discharging cavity, is then extracted through the axial flow fan and is discharged from a discharging port; fresh air is sucked from a fresh air inlet in the upper part of the right side of the shell, is pressurized by the axial flow fan, enters the cavity, then flows into the D end of the heat exchanger core, enters the fresh air side flow channel to obtain the heat of the damp-heat waste gas, and heated dry fresh air flows out of the B end of the heat exchanger core, enters the cavity, is pressurized by the axial flow fan, and then flows into the drying room through a fresh air outlet pipe.
The phase-change heat exchanger core in the scheme is a compact structure which is made of hydrophilic metal foils with good heat conductivity, extremely small thermal inertia and large heat exchange area, and a wet and hot waste gas flow channel and a fresh air flow channel are isolated from each other by the metal foils layer by layer, so that only heat exchange can be carried out, and exchange of fluid media and humidity do not exist.
Because the moisture-removing amount of the drying room is determined according to the humidity curve of the baking process of the product, such as a moisture-preserving stage, a low moisture-removing stage and a strong moisture-removing stage, different requirements are provided, when the moisture-removing amount is small, the axial flow fan stops running, when the moisture-removing amount needs to be increased and more fresh air needs to be supplemented, the axial flow fan 71 or 74 can be started to run or the axial flow fans 71 and 74 and the axial flow fans 72 and 73 can be started to run simultaneously, when the strong moisture-removing amount needs to be increased, all the axial flow fans 71, 74 and 72 and 73 can be started, and the adaptability is better.
When the fresh air and the damp-heat gas discharged from the drying room exchange heat in the heat exchanger, the temperature of the fresh air is far lower than that of the damp-heat gas discharged from the drying room due to the fact that the fresh air comes from the natural environment temperature at the moment, the heat exchanger can rapidly cool the damp-heat gas, the temperature of the fresh air is increased, and sensible heat exchange is achieved; the relative humidity of the damp-heat air from the drying room is very high and approaches to the saturation humidity, so that in the process of temperature reduction of the damp-heat air in the heat exchanger, the contained water vapor can be changed into liquid phase from gas phase and condensed into water, and phase change occurs. The condensed water is discharged from the condensed water outlet pipe. In the process, the damp and hot waste gas can release phase change heat, and the heat is also transferred to the fresh air, so that the temperature of the fresh air is increased, namely the scheme not only recovers the sensible heat in part of the low-grade damp and hot waste gas, but also recovers part of latent heat, and improves the heat recovery efficiency.
Traditional low-grade damp and hot waste gas waste heat recovery only retrieves the sensible heat, and it is limited to rise the effect to the temperature of new trend, and this technical scheme simple structure not only can retrieve the sensible heat in the damp and hot waste gas, more mainly has adopted phase transition heat transfer technique, can retrieve latent heat wherein, has just promoted the waste heat recovery efficiency of low-grade damp and hot waste gas. The scheme has the advantages of simple and reliable structure, strong adaptability and good heat recovery effect.
The utility model discloses the technique has reached expected effect in tobacco leaf intensive curing barn actual application, and if the exhaust damp and hot gas temperature is 42 ℃ in the big stage drying house that dehumidifies, ambient temperature is 24 ℃, and the difference in temperature only has 18 ℃, if only sensible heat recovery, theoretically new trend temperature can only rise to 31 ℃ at most, intensifies 7 ℃. Because this technical scheme not only can retrieve the sensible heat in the damp and hot waste gas, can also retrieve latent heat, in fact, the temperature of new trend rises to 35 ℃ from 24 ℃ after the heat reclamation device, and the intensification 11 ℃, heat recovery efficiency improves 60%. In practical application, the higher the relative humidity of the damp and hot exhaust gas exhausted from the drying room and the baking room is, the larger the latent heat recovery amount is. The amount of the discharged damp-heat gas is more than that of the fresh air entering the drying room, and a part of the steam discharged by the baked product is larger than that of the fresh air entering the drying room, but the proportion of the steam in the discharged gas is very small, so that the amount of the fresh air entering the drying room is basically equal to the amount of the waste gas discharged from the drying room. In this example, if the drying room has no heat recovery, the heating device of the drying room is required to raise the temperature of the fresh air entering the drying room from 24 ℃ to 42 ℃ and 18 ℃, after the technical scheme is adopted, the heat recovery device raises the temperature of the fresh air from 24 ℃ to 35 ℃, the heating device of the drying room only needs to raise the temperature of the fresh air entering the drying room from 37 ℃ to 42 ℃, namely 7 ℃, so that the requirement is met, and the energy consumption of the drying room can be reduced by about 60% in the dehumidification stage.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (7)
1. The utility model provides a phase transition formula heat recovery device suitable for low-grade damp and hot waste gas waste heat recovery which characterized in that: the method comprises the following steps: the phase-change cross type heat exchanger core is arranged in the shell; a drying room exhaust damp and hot waste gas inlet, a cooled and dehumidified waste gas outlet, a fresh air inlet and a heated fresh air outlet connecting pipe are arranged on the side surface of the shell; the bottom of the shell is provided with an outlet connecting pipe for condensed water; the phase change cross type heat exchanger core comprises a heat exchanger and a first channel, a second channel, a third channel and a fourth channel which are respectively communicated with the heat exchanger in a universal mode, wherein the first channel and the third channel are communicated through the heat exchanger in the universal mode, and the second channel and the fourth channel are communicated through the heat exchanger in the universal mode; the phase change cross type heat exchanger core and the shell form a first cavity, a second cavity, a third cavity and a fourth cavity which are isolated from each other; the shell and the phase change cross type heat exchanger core are combined to form two paths for gas circulation, and the first path is as follows: the drying room is provided with a damp and hot waste gas inlet, a first cavity, a first channel, a heat exchanger, a third channel, a third cavity and a waste gas outlet after temperature reduction and dehumidification; the second path is: the fresh air inlet, the second cavity, the second channel, the heat exchanger, the fourth channel, the fourth cavity and the outlet connecting pipe of the heated fresh air.
2. The phase-change heat recovery device suitable for recovering the waste heat of low-grade damp-heat waste gas as claimed in claim 1, wherein: the lower part of the right side of the shell is provided with a drying room exhaust damp and hot waste gas inlet, the upper part of the left side of the shell is provided with a waste gas outlet after temperature reduction and dehumidification, the upper part of the right side of the shell is provided with a fresh air inlet, and the lower part of the left side of the shell is provided with an outlet connecting pipe of heated fresh air.
3. The phase-change heat recovery device suitable for recovering the waste heat of low-grade damp-heat waste gas as claimed in claim 1 or 2, which is characterized in that: an axial flow fan for pumping damp and hot waste gas is arranged in the damp and hot waste gas outlet of the drying room.
4. The phase-change heat recovery device suitable for recovering the waste heat of low-grade damp-heat waste gas as claimed in claim 1 or 2, which is characterized in that: an exhaust axial flow fan is arranged in the exhaust outlet after temperature reduction and dehumidification.
5. The phase-change heat recovery device suitable for recovering the waste heat of low-grade damp-heat waste gas as claimed in claim 1 or 2, which is characterized in that: an axial flow fan for sucking ambient air is arranged in the fresh air inlet.
6. The phase-change heat recovery device suitable for recovering the waste heat of low-grade damp-heat waste gas as claimed in claim 1 or 2, which is characterized in that: an axial flow fan is arranged in the outlet connecting pipe of the heated fresh air.
7. The phase-change heat recovery device suitable for recovering the waste heat of low-grade damp-heat waste gas as claimed in claim 1 or 2, which is characterized in that: the phase change cross type heat exchanger core is divided into the four channels in a diagonal form, and a heat exchanger is arranged in the middle of the four channels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920662118.9U CN210773604U (en) | 2019-05-09 | 2019-05-09 | Phase-change heat recovery device suitable for recovering waste heat of low-grade damp and hot waste gas |
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| CN201920662118.9U CN210773604U (en) | 2019-05-09 | 2019-05-09 | Phase-change heat recovery device suitable for recovering waste heat of low-grade damp and hot waste gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113557889A (en) * | 2021-08-11 | 2021-10-29 | 刘生记 | Greenhouse dehumidifying device and dehumidifying method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113557889A (en) * | 2021-08-11 | 2021-10-29 | 刘生记 | Greenhouse dehumidifying device and dehumidifying method |
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Effective date of registration: 20230329 Address after: 101-B8040, Floor 2, Building 4, No. 9, Renxinzhuang South, Tongzhou District, Beijing, 101108 Patentee after: Hainei Huanneng (Beijing) Technology Co.,Ltd. Address before: Room 219, 2999 Dongfu Avenue, Dongfu Town, Haicang District, Xiamen City, Fujian Province, 361000 Patentee before: FUJIAN DAWEI ENERGY Co.,Ltd. |