CN211664944U - Waste heat recovery drying system - Google Patents
Waste heat recovery drying system Download PDFInfo
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- CN211664944U CN211664944U CN201922088081.6U CN201922088081U CN211664944U CN 211664944 U CN211664944 U CN 211664944U CN 201922088081 U CN201922088081 U CN 201922088081U CN 211664944 U CN211664944 U CN 211664944U
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Abstract
The utility model relates to a stoving technical field discloses a waste heat recovery drying system, and it includes: the device comprises a first heat exchanger, a second heat exchanger, a circulating fan and a drying chamber; the drying device comprises a drying chamber, a first heat exchanger, a second heat exchanger, a circulating fan, a first air inlet, a second water outlet, a first air outlet, a second air inlet, a second air outlet, a drying assembly, a third air inlet and an air outlet of the circulating fan, wherein the first air inlet of the first heat exchanger is communicated with a waste heat source, the second water inlet of the second heat exchanger is communicated with the first water outlet of the first heat exchanger, the second water outlet of the circulating fan is communicated with the second air outlet of the second heat exchanger, the drying chamber is internally provided with the drying assembly, the. The utility model has the advantages that: the waste heat source is utilized, the sludge or other substances can be dried, the drying at an overhigh temperature can be avoided, and the energy-saving and environment-friendly effects are realized.
Description
Technical Field
The utility model relates to a stoving technical field especially relates to a waste heat recovery drying system.
Background
The sewage is precipitated to form sludge, the water content of the sludge can reach more than 99 percent, and the traditional mechanical dehydration equipment (such as a screw stacking machine, a plate-and-frame filter press, a centrifugal machine, a belt type dehydrator and the like) can only dehydrate the sludge to 70 to 85 percent of water content, which still cannot achieve an ideal state for incineration. If the sludge is continuously dehydrated to the water content of below 40 percent, additional drying equipment is needed; the form of the sludge drying equipment can be divided into a rotary drum type, a rotary disc type, a paddle type, a belt type, a centrifugal type, a fluidized bed and the like, wherein most of dehydration modes are direct heating types: the sludge is directly contacted and mixed with the heating medium, so that the water in the sludge is evaporated, the sludge can be dried, the common heating medium is high-temperature flue gas or high-temperature steam (400 ℃ -800 ℃), the odor of the waste gas after the sludge drying is large, the dust content and the harmful substances are high, the pollution is serious, the waste gas can be discharged after being treated, a large amount of heat in the air in a drying room can be taken away by the discharged waste gas, the waste of the heat in the drying room is caused, the equipment investment of high-temperature drying resistance is large, and the operation cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the waste heat recovery drying system overcomes the defects of the prior art, can utilize the heat of the waste heat source to dry sludge or other substances at low temperature, avoids directly using the waste heat source for drying the sludge or other substances, can recycle hot air in the drying chamber, and is energy-saving and environment-friendly.
In order to achieve the above object, a first aspect of the present invention provides a waste heat recovery drying system, which includes: the device comprises a first heat exchanger, a second heat exchanger, a circulating fan and a drying chamber;
the first air inlet is used for being communicated with a waste heat source, the second heat exchanger is provided with a second water inlet, a second water outlet, a second air inlet and a second air outlet, the second water inlet is communicated with the first water outlet, the second water outlet is communicated with the first water inlet, an air suction opening of the circulating fan is communicated with the second air outlet of the second heat exchanger, the drying chamber is provided with a third air inlet and a third air outlet, a drying assembly is arranged in the drying chamber, the third air inlet is communicated with an air outlet of the circulating fan, and the third air outlet is communicated with the second air inlet.
Preferably, a dehumidifying device is further arranged between the drying chamber and the second heat exchanger, the dehumidifying device is provided with a fourth air inlet and a fourth air outlet, the fourth air inlet is communicated with the third air outlet, and the fourth air outlet is communicated with the second air inlet.
Preferably, the dehumidification device is a cold water heat exchanger, and the water inlet temperature of the cold water heat exchanger is less than or equal to 30 ℃.
Preferably, a drainage structure is arranged at the bottom of the cold water heat exchanger.
Preferably, a dust removing device is further connected between the third air outlet and the fourth air inlet.
Preferably, the dust removing device is a filter screen.
Preferably, the drying assembly comprises a plurality of conveyor belts, the conveyor belts are sequentially arranged at intervals from top to bottom, and the conveying directions of two adjacent conveyor belts are opposite.
Preferably, the third air inlet is opened at the bottom of the drying chamber, and the third air outlet is opened at the top of the drying chamber.
Preferably, the conveyor belt is in a hollow net shape.
In a second aspect of the present invention, a waste heat recovery drying method is provided, which is characterized by using the waste heat recovery drying system as any one of the first aspect.
Preferably, the air outlet temperature at the second air outlet is 60-85 ℃ and the humidity is 5-20%.
The embodiment of the utility model provides a waste heat recovery drying system and method, compare with prior art, its beneficial effect lies in:
the waste heat recovery drying system and method provided by the embodiment of the utility model utilize the high temperature steam or other waste heat of the power plant by the first heat exchanger and the second heat exchanger, so as to generate dry hot drying air by using the heat quantity of the high temperature steam or other waste gases, and the temperature of the hot drying air is greatly reduced relative to the temperature of the waste heat source, thereby avoiding volatilization of harmful substances caused by overhigh drying temperature and preventing the drying equipment from being damaged by high temperature drying; in addition, a closed system is adopted for drying sludge or other substances, hot air flow exhausted from the drying chamber flows into the second heat exchanger again for heating and then circularly flows into the drying chamber, no tail gas is discharged, waste gas does not need to be discharged, and the energy-saving and environment-friendly effects are achieved.
Drawings
Fig. 1 is a schematic structural diagram of a waste heat recovery drying system in an embodiment of the present invention;
in the figure, 1, a first heat exchanger; 11. a first water inlet; 12. a first water outlet; 13. a first air inlet; 14. a first air outlet; 2. a second heat exchanger; 21. a second water inlet; 22. a second water outlet; 23. a second air inlet; 24. a second air outlet; 3. a circulating fan; 4. a drying assembly; 41. a conveyor belt; 5. a cold water heat exchanger; 51. a fourth air inlet; 52. a fourth air outlet; 53. a drainage structure; 6. a dust removal device; 7. a sludge forming device; 8. a conveying device.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "first", "second", and the like are used in the present invention to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
As shown in fig. 1, the first aspect of the preferred embodiment of the present invention provides a waste heat recovery drying system, which includes: a first heat exchanger 1, a second heat exchanger 2, a circulating fan 3 and a drying chamber (not shown in the drawing); first heat exchanger 1 has first water inlet 11, first delivery port 12, first air inlet 13 and first gas outlet 14, first air inlet 13 is used for with used heat source intercommunication, second heat exchanger 2 has second water inlet 21, second delivery port 22, second air inlet 23 and second gas outlet 24, second water inlet 21 intercommunication first delivery port 12, second delivery port 22 intercommunication first water inlet 11, circulating fan 3's inlet scoop intercommunication the second gas outlet 23 of second heat exchanger 2, the drying chamber has third air inlet and third gas outlet, just be equipped with drying assembly 4 in the drying chamber, the third air inlet with circulating fan 4's air exit intercommunication, third gas outlet intercommunication second air inlet 23.
It should be noted that the system in this embodiment is mainly used for drying sludge, but is not limited to drying sludge, and may also be used for drying other substances, and only sludge drying is specifically described in the following detailed description and the accompanying drawings.
When being used for mud stoving with above-mentioned waste heat recovery drying system, be used for placing mud in the stoving subassembly, specific stoving process is:
after heat of high-temperature steam or flue gas (the temperature is 400-500 ℃) of a power plant passes through the first heat exchanger 1, a heat exchange medium in the first heat exchanger 1 is heated, the temperature of the heat exchange medium in the first heat exchanger 1 is raised from 55-60 ℃ to 85-90 ℃, the high-temperature heat exchange medium is output into the second heat exchanger 2 from the first water outlet 12, meanwhile, low-temperature hot gas exhausted from the drying chamber is output into the second heat exchanger 2, the low-temperature hot gas exchanges heat with the high-temperature heat exchange medium in the second heat exchanger 2, and then the high-temperature dried gas (the temperature is 60-85 ℃) is input into the drying chamber, so that sludge borne on the drying component 5 in the drying chamber is dried, the temperature of the exhausted gas after drying is 50-55 ℃, and the gas is recycled to the second heat exchanger 2 so as to recycle the dried gas.
Based on the technical scheme, the first heat exchanger 1 and the second heat exchanger 2 are arranged to recycle high-temperature steam or flue gas of a power plant or other waste heat sources, the temperature of drying hot air is greatly reduced for the high-temperature steam, volatilization of harmful substances caused by overhigh drying temperature can be avoided, and damage of high-temperature drying to drying equipment is prevented; in addition, a closed system is adopted for drying the sludge, hot air exhausted from the drying chamber flows into the second heat exchanger again for heating and then circularly flows into the drying chamber, no tail gas is discharged, waste gas does not need to be discharged and treated, and the energy-saving and environment-friendly effects are achieved.
Preferably, in order to better recycle the hot air exhausted from the drying chamber, a dehumidifying device is further arranged between the drying chamber and the second heat exchanger 2, the dehumidifying device is provided with a fourth air inlet 51 and a fourth air outlet 52, the fourth air inlet 51 is communicated with the third air outlet, and the fourth air outlet 52 is communicated with the second air inlet 23; the hot air exhausted from the drying chamber is dehumidified by the dehumidifier and then has a humidity of 5% -20%, and then flows into the second heat exchanger 2 for recycling.
In the embodiment, the dehumidification device is a cold water heat exchanger 5, and the water inlet temperature of the cold water heat exchanger 5 is less than or equal to 30 ℃; in the specific drying process, the cold water heat exchanger 5 is only connected with tap water, the gas discharged from the drying chamber is 50-55 ℃, the temperature of the discharged gas at the temperature is 32-36 ℃ after the discharged gas flows through the cold water heat exchanger 5, and the moisture in the gas is condensed on the outer surface of the heat exchange tube of the cold water heat exchanger 5, so that the dehumidification effect is achieved.
Further, in order to discharge the dehumidified condensed water, a drainage structure 53 is provided at the bottom of the cold water heat exchanger 5; the drainage structure 53 illustratively comprises a water pan, the water pan is provided with a water outlet, a drain pipe is connected to the water outlet, during the dehumidification process, the cold water heat exchanger 5 generates condensed water on the surface of the water pan, and the condensed water flows to the bottom of the water pan and then is drained through the drain pipe.
In this embodiment, a dust removing device 6 is further connected between the third air outlet and the fourth air inlet 51, so as to remove dust from the air discharged from the drying chamber, and prevent dust contained in the air from entering each dehumidifier or the second heat exchanger 2, which affects the dehumidification effect and the heat exchange efficiency.
Illustratively, the dust removing device 6 is a filter screen, and the structure is simple.
Specifically, in this embodiment, the drying assembly 4 includes a plurality of conveyor belts 41, each of the conveyor belts 41 is sequentially arranged at intervals from top to bottom, and the conveying directions between two adjacent conveyor belts 41 are opposite; specifically, as shown in fig. 1, the conveyor belt 41 located at the uppermost layer is driven clockwise, and when sludge particles or sludge blocks thereon slowly move to the rightmost end along with the movement of the conveyor belt, the sludge particles or sludge blocks fall onto the conveyor belt 41 located below the conveyor belt, and sequentially fall down layer by layer, and moisture evaporation is performed in each conveyor belt 41, so that the drying of the sludge is finally realized. Illustratively, the water content of the sludge placed on the first layer conveyor belt 41 is generally 70% to 85%, and the water content of the sludge after final drying is 30% or less.
Preferably, in order to fully evaporate the moisture in the sludge, the third air inlet is opened at the bottom of the drying chamber, and the third air outlet is opened at the top of the drying chamber (not shown in the drawing); therefore, the flowing direction of hot air in the drying chamber is integrally reverse to the conveying direction of the sludge.
Also, in order to allow the hot air to sufficiently contact the sludge particles or the sludge blanket on each conveyor belt 41 during the sludge transfer, the conveyor belts 41 have a hollow-out net shape.
Specifically, the drying assembly 4 in this embodiment includes three conveyor belts 41, specifically: upper conveyer belt, middle level conveyer belt and lower floor's conveyer belt, simple structure just can reach the stoving effect.
The sludge needs to be preliminarily molded before being dried so as to improve the heat exchange area between the sludge and hot gas during drying; in order to realize the systematic processing of mud, the drying chamber has the feed inlet, waste heat recovery drying system still includes mud forming device 7, mud forming device 7 with the feed inlet links to each other, and mud through mechanical dehydration is advanced to be gone into mud forming device 7 and is carried out breakage or extrusion and handle, with mud processing one-tenth granule, cubic or strip, and graininess, cubic or strip mud get into the drying chamber from the feed inlet and dry, and because mud has carried out the shaping and has handled for can form the bridge between the mud granule, thereby increase drying area, make drying efficiency increase substantially.
Further, the drying chamber has the discharge gate, waste heat recovery drying system still includes conveying equipment 8, conveying equipment 8 with the discharge gate links to each other, and the mud granule or the sludge block after the drying are sent away behind conveying equipment 8, and bagging-off transportation or direct transport are to burning.
Illustratively, the conveying device 8 may be a screw conveyor, and the sludge conveyed by the screw conveyor can be further crushed and processed, which greatly facilitates the subsequent combustion processing.
In a second aspect of the embodiments of the present invention, a waste heat recovery sludge drying method is further provided, which employs the waste heat recovery drying system as described above in the first aspect.
Since the waste heat recovery drying method utilizes any one of the waste heat recovery drying systems, all the beneficial effects of the waste heat recovery drying system are achieved, and the details are not repeated herein.
Preferably, in this embodiment, the air outlet temperature at the second air outlet 24 is 60 ℃ to 85 ℃ and the humidity is 5% to 20%, which can avoid the damage to the drying equipment caused by the over-high drying temperature and ensure the drying efficiency.
In this embodiment, it is better to ensure that the air outlet temperature from the second air outlet 24 is 70 ℃ to 75 ℃ and the humidity is 10% to 15%, so as to achieve higher drying efficiency at a lower drying temperature.
To sum up, the embodiment of the present invention provides a waste heat recovery drying system and method, wherein a first heat exchanger and a second heat exchanger are arranged to recycle high temperature steam or other waste heat of a power plant, so as to generate dry hot drying air by using the heat quantity of the high temperature steam or other waste gas, and the temperature of the hot drying air is greatly reduced relative to the temperature of a waste heat source, thereby avoiding volatilization of harmful substances caused by overhigh drying temperature and preventing damage of high temperature drying to a drying device; in addition, a closed system is adopted for drying sludge or other substances, hot air exhausted by the drying chamber flows into the second heat exchanger again for heating and then circularly flows into the drying chamber, no tail gas is exhausted, waste gas does not need to be exhausted, and the energy-saving and environment-friendly effects are achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a waste heat recovery drying system which characterized in that includes: the device comprises a first heat exchanger, a second heat exchanger, a circulating fan and a drying chamber;
the first heat exchanger has first water inlet, first delivery port, first air inlet and first gas outlet, first air inlet be used for with used heat source intercommunication, the second heat exchanger has second water inlet, second delivery port, second air inlet and second gas outlet, second water inlet intercommunication first delivery port, second delivery port intercommunication first water inlet, circulating fan's inlet scoop intercommunication the second gas outlet of second heat exchanger, the drying chamber has third air inlet and third gas outlet, just be equipped with drying assembly in the drying chamber, the third air inlet with circulating fan's air exit intercommunication, third gas outlet intercommunication the second air inlet.
2. The waste heat recovery drying system of claim 1, further comprising a dehumidifying device disposed between the drying chamber and the second heat exchanger, wherein the dehumidifying device has a fourth air inlet and a fourth air outlet, the fourth air inlet is communicated with the third air outlet, and the fourth air outlet is communicated with the second air inlet.
3. The waste heat recovery drying system of claim 2, wherein the dehumidifier is a cold water heat exchanger, and the inlet water temperature of the cold water heat exchanger is less than or equal to 30 ℃.
4. The waste heat recovery drying system of claim 3, wherein a drain structure is provided at the bottom of the cold water heat exchanger.
5. The waste heat recovery drying system of claim 2, wherein a dust removing device is further connected between the third air outlet and the fourth air inlet.
6. The waste heat recovery drying system of claim 5, wherein the dust removing device is a filter screen.
7. The waste heat recovery drying system of claim 1, wherein the drying assembly comprises a plurality of conveyor belts, each conveyor belt is arranged at intervals from top to bottom, and the conveying directions of two adjacent conveyor belts are opposite.
8. The heat recovery drying system of claim 7, wherein the third air inlet is open at the bottom of the drying chamber, and the third air outlet is open at the top of the drying chamber.
9. The heat recovery drying system of claim 7, wherein the conveyor belt is in the form of a hollow mesh.
10. The heat recovery drying system of claim 7, wherein the drying assembly includes three of the conveyor belts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922088081.6U CN211664944U (en) | 2019-11-27 | 2019-11-27 | Waste heat recovery drying system |
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| CN201922088081.6U CN211664944U (en) | 2019-11-27 | 2019-11-27 | Waste heat recovery drying system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110776241A (en) * | 2019-11-27 | 2020-02-11 | 广东芬蓝环境科技有限公司 | Waste heat recovery drying system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110776241A (en) * | 2019-11-27 | 2020-02-11 | 广东芬蓝环境科技有限公司 | Waste heat recovery drying system and method |
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