CN112797777B - Sludge heat pump drying system and method - Google Patents
Sludge heat pump drying system and method Download PDFInfo
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- CN112797777B CN112797777B CN201911106098.8A CN201911106098A CN112797777B CN 112797777 B CN112797777 B CN 112797777B CN 201911106098 A CN201911106098 A CN 201911106098A CN 112797777 B CN112797777 B CN 112797777B
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- drying
- sludge
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- 238000001035 drying Methods 0.000 title claims abstract description 89
- 239000010802 sludge Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 112
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 56
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 230000008020 evaporation Effects 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000007791 dehumidification Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
- F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
- F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/02—Applications of driving mechanisms, not covered by another subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of drying equipment, and discloses a sludge heat pump drying system and a method, wherein the sludge heat pump drying system comprises: a dryer and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor, an air cooling component, a throttle valve and an evaporation component which are sequentially connected, a working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling component and the evaporation component are arranged in the dryer, the air cooling component comprises a plurality of air coolers which are connected in series, and the evaporation component comprises a plurality of evaporators which are connected in series. According to the sludge heat pump drying system and method provided by the invention, carbon dioxide is arranged as the working medium of the heat pump system, so that the air outlet temperature higher than that of a conventional heat pump system can be obtained, and the plurality of air coolers and the plurality of evaporators are arranged, so that the heat released by the carbon dioxide can be utilized to the maximum extent, the dehumidification rate is effectively improved, the efficiency of the heat pump system is improved, and the energy is saved.
Description
Technical Field
The invention relates to the technical field of drying equipment, in particular to a sludge heat pump drying system and a method.
Background
As industrial and domestic waste, the main components of the sludge mainly comprise inorganic components, organic particle components, biological thallus components, other colloid components and the like, most of the substances except for harmful substances such as heavy metals can improve soil fertility and have higher heat value, and the dried sludge is used for building boards, biofertilizers, fuels and the like. Common sludge drying modes comprise high-temperature heat drying, vacuum drying, radiation drying and the like, and have the problems of high equipment initial investment, high drying energy consumption, high running cost and the like.
The low-temperature thermal drying technology represented by the heat pump sludge drying technology is a better sludge treatment means, can obviously reduce the volume of the sludge, has stable product properties, and has no malodor and pathogenic organisms; the sludge product after drying treatment has multiple purposes, can adapt the sludge characteristics to the requirements of wider treatment and disposal processes, and is a sludge treatment method worthy of popularization.
At present, the heat pump sludge drying technology is limited by the working temperature of a heat pump, and the dehumidification rate of the heat pump sludge drying technology still needs to be improved.
Disclosure of Invention
The embodiment of the invention provides a sludge heat pump drying system and a method, which are used for solving or partially solving the problem that the dehumidification rate of the existing heat pump sludge drying technology is limited by the working temperature of a heat pump and still needs to be improved.
The embodiment of the invention provides a sludge heat pump drying system, which comprises: a dryer and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor, an air cooling assembly, a throttle valve and an evaporation assembly which are sequentially connected, a working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling assembly and the evaporation assembly are arranged in the dryer, the air cooling assembly comprises a plurality of air coolers connected in series, and the evaporation assembly comprises a plurality of evaporators connected in series.
On the basis of the scheme, a plurality of layers of conveying belts for conveying substances to be dried are arranged in the dryer, the air cooling assembly is arranged above the uppermost layer of conveying belts, and the evaporation assembly is arranged below the lowermost layer of conveying belts.
On the basis of the scheme, the air coolers and the evaporators are arranged in a one-to-one correspondence mode, and the air coolers and the evaporators are uniformly distributed along the conveying direction of the conveying belt.
On the basis of the scheme, the dryer further comprises a plurality of first heat insulation layers, the first heat insulation layers divide the interior of the dryer into a plurality of sections along the conveying direction of the conveyor belt, and any section comprises one air cooler and one evaporator.
On the basis of the scheme, at least one fan is arranged in any interval, and the fan is used for driving the drying medium in the interval to circularly flow.
On the basis of the scheme, the carbon dioxide heat pump system further comprises a heat regenerator, and a connecting pipeline between the throttle valve and the air cooler close to the throttle valve and a connecting pipeline between the compressor and the evaporator close to the compressor respectively flow through the heat regenerator to exchange heat.
On the basis of the scheme, the heat regenerator is arranged on one side of the dryer, and a second heat insulation layer is arranged between the heat regenerator and the conveyor belt and inside the dryer.
On the basis of the scheme, the surface of the evaporator is provided with the condensed water collecting discs, and a plurality of condensed water collecting discs on the surface of the evaporator are respectively communicated with the condensed water pipes.
On the basis of the scheme, the filter press is also included; the outlet of the filter press is connected with the inlet of the dryer.
The embodiment of the invention provides a sludge heat pump drying method based on the sludge heat pump drying system, which comprises the following steps: heating and dehumidifying a drying medium in the dryer by using a carbon dioxide heat pump system so as to dry a substance to be dried; a multistage air cooler and a multistage evaporator are arranged in the carbon dioxide heat pump system so as to carry out multistage drying treatment on a substance to be dried; when the material to be dried is subjected to multistage drying treatment, circulating air is respectively formed to circularly dry the material to be dried; the operating frequency of the compressor in the carbon dioxide heat pump system is 0-50Hz.
According to the sludge heat pump drying system and method provided by the embodiment of the invention, carbon dioxide is arranged as the working medium of the heat pump system, so that the air outlet temperature higher than that of a conventional heat pump system can be obtained, and the plurality of air coolers and the plurality of evaporators are arranged, so that the heat released by the carbon dioxide can be utilized to the maximum extent, the dehumidification rate is effectively improved, the efficiency of the heat pump system is improved, and the energy is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a sludge heat pump drying system according to an embodiment of the present invention.
Reference numerals illustrate:
wherein, 1, a filter press; 2. an air cooler; 3. a dryer; 4. a compressor; 5. an evaporator; 6. a throttle valve; 7. a regenerator; 8. a first insulating layer; 9. a second insulating layer; 10. a blower; 11. a substance to be dried; 12. a condenser water pipe; 13. a housing.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
An embodiment of the present invention provides a sludge heat pump drying system, referring to fig. 1, including: a dryer 3 and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor 4, an air cooling component, a throttle valve 6 and an evaporation component which are sequentially connected, a working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling component and the evaporation component are arranged in the dryer 3, the air cooling component comprises a plurality of air coolers 2 which are connected in series, and the evaporation component comprises a plurality of evaporators 5 which are connected in series.
According to the heat pump drying system provided by the embodiment, the carbon dioxide heat pump system is adopted to heat and dehumidify a drying medium in the dryer 3, so that drying treatment of the substance 11 to be dried is realized. Compared with other heat pumps, the carbon dioxide heat pump has the advantages of high air outlet temperature, wide operating temperature range, strong environment adaptability and the like.
The carbon dioxide in the heat pump system is condensed and released at the air cooling component, so that the surrounding drying medium can be heated; the carbon dioxide evaporates and absorbs the heat of the drying medium at the evaporation component, and the moisture in the drying medium is condensed, so that the drying medium is dehumidified; further, the drying treatment of the substance to be dried 11 is realized.
The air cooling component of the heat pump drying system is provided with a plurality of air coolers 2 which are connected in series, so that drying media in the dryer 3 can be heated layer by layer, the outlet temperature of the air coolers 2 is reduced, and the heat of the carbon dioxide heat pump system is fully utilized; the evaporation assembly is provided with a plurality of evaporators 5 which are connected in series, so that the drying medium in the dryer 3 can be cooled and dehumidified layer by layer, and the dehumidification rate is improved.
According to the sludge heat pump drying system provided by the embodiment, carbon dioxide is arranged as a working medium of the heat pump system, so that higher air outlet temperature can be obtained compared with a conventional heat pump system, and the heat released by the carbon dioxide can be utilized to the greatest extent by arranging the plurality of air coolers 2 and the plurality of evaporators 5, so that the dehumidification rate is effectively improved, the efficiency of the heat pump system is improved, and the energy is saved.
Further, the drying medium is a gaseous medium which is in contact with the substance 11 to be dried inside the dryer 3 to dry it; the drying medium may be air or the like, and is not limited.
Further, on the basis of the above embodiment, the inside of the dryer 3 is provided with a plurality of layers of conveyor belts for conveying the substances 11 to be dried, the air cooling assembly is arranged above the uppermost layer of conveyor belts, and the evaporation assembly is arranged below the lowermost layer of conveyor belts. The dryer 3 is a multi-layer belt dryer 3. The top of the dryer 3 is provided with an inlet for the material 11 to be dried and the bottom is provided with an outlet.
The air cooling component is arranged at the top of the dryer 3, so that the material to be dried 11 with larger water content which just enters the dryer 3 is in a higher temperature range, and the drying efficiency is improved. The evaporation component is arranged at the bottom of the dryer 3, so that the influence on the temperature and humidity of the position of the material 11 to be dried in the dryer 3 can be reduced, the dehumidification rate is ensured, the temperature of a drying medium in the dryer 3 is maintained, and the drying efficiency is improved.
Further, on the basis of the above embodiment, the plurality of air coolers 2 and the plurality of evaporators 5 are arranged in one-to-one correspondence up and down, and the plurality of air coolers 2 and the plurality of evaporators 5 are uniformly distributed along the conveying direction of the conveyor belt, respectively. The conveying direction of the conveyor belt, that is, the distribution length direction of the substances 11 to be dried in the dryer 3, that is, the plurality of air coolers 2 and the plurality of evaporators 5 are uniformly distributed in the length direction of the substances 11 to be dried, respectively. The drying medium can be uniformly heated, cooled and dehumidified, and the drying efficiency and the dehumidification rate are improved.
Further, on the basis of the above embodiment, the dryer further comprises a plurality of first heat insulation layers 8, wherein the first heat insulation layers 8 divide the interior of the dryer 3 into a plurality of sections along the conveying direction of the conveyor belt, and any section comprises one air cooler 2 and one evaporator 5.
The air coolers 2 are arranged in one-to-one correspondence with the evaporators 5. Each air cooler 2 and the corresponding evaporator 5 are a pair of heat pump assemblies, namely, a first heat insulation layer 8 is arranged between any two adjacent pairs of heat pump assemblies. I.e. a plurality of first insulation layers 8 are arranged at intervals along the length of the conveyor belt. The first heat insulation layer 8 penetrates through the multi-layer conveyor belt and the carbon dioxide heat pump system in the height direction; also penetrating the conveyor belt in the width direction; the first heat insulating layer 8 can be fixedly connected with the inner wall of the dryer 3.
The first heat insulating layers 8 divide the interior space of the dryer 3 into a plurality of divided sections, each section having an air cooler 2 at the top and an evaporator 5 at the bottom. A separate drying medium circulation may be formed in each section. The plurality of zones may form multi-stage drying of the substance 11 to be dried. The heat of the carbon dioxide is fully utilized, and the drying efficiency is improved. The first heat insulating layer 8 is formed of a heat insulating material, and the provision of the first heat insulating layer 8 is also advantageous in maintaining the temperature of the drying medium in each section to sufficiently dry the substance 11 to be dried.
Further, on the basis of the above embodiment, at least one fan 10 is disposed in any interval, and the fan 10 is used for driving the drying medium located in the interval to circulate. The drying medium in each interval formed by the first heat insulation layer 8 is driven to circularly flow by the fan 10, and the drying medium can circularly contact the substance 11 to be dried for a plurality of times and simultaneously contact the air cooler 2 and the evaporator 5 for a plurality of times, so that the substance 11 to be dried in each interval can be circularly dried for a plurality of times, and the drying efficiency is improved.
Further, a fan 10 may be provided at the top and bottom of each section, respectively, and a circulation flow of the drying medium in the section may be formed. The fan 10 may be secured by the first insulation layer 8.
Further, based on the above embodiment, the carbon dioxide heat pump system further includes a regenerator 7, and the connection pipe between the throttle valve 6 and the air cooler 2 near the throttle valve 6 and the connection pipe between the compressor 4 and the evaporator 5 near the compressor 4 respectively flow through the regenerator 7 to exchange heat.
The air cooler 2 near the throttle valve 6 is the final stage air cooler 2, and the evaporator 5 near the compressor 4 is the final stage evaporator 5. The carbon dioxide flowing out of the final stage gas cooler 2 exchanges heat with the carbon dioxide flowing out of the final stage evaporator 5 in the regenerator 7. The carbon dioxide flowing out of the final-stage gas cooler 2 transfers heat to the carbon dioxide flowing out of the final-stage evaporator 5, so that the temperature of the carbon dioxide entering the compressor 4 can be increased, the temperature of the carbon dioxide entering the throttle valve 6 can be reduced, the efficiency of the heat pump system can be improved, the full utilization of energy is realized, and the energy is saved.
Further, on the basis of the above embodiment, the regenerator 7 is provided at one side of the dryer 3, and a second heat insulation layer 9 is provided between the regenerator 7 and the conveyor belt and inside the dryer 3. The second heat insulation layer 9 separates the heat regenerator 7 from the substances 11 to be dried on the conveyor belt, which is beneficial to maintaining the temperature of the drying medium around the substances 11 to be dried and ensuring the drying efficiency.
Further, referring to fig. 1, the regenerator 7, the throttle valve 6, and the compressor 4 may be provided outside the dryer 3; so as to reduce the occupied space of the internal installation of the dryer 3 and avoid influencing the internal environment of the dryer 3. A housing 13 may also be provided to encapsulate the dryer 3, regenerator 7, throttle valve 6 and compressor 4 so as to increase the integrity of the drying system for ease of setup.
Further, on the basis of the above embodiment, the surface of the evaporator 5 is provided with condensate collecting trays, and the condensate collecting trays on the surfaces of the plurality of evaporators 5 are respectively communicated with the condensate pipe 12. The drying medium contacts with the evaporator 5, and the moisture in the drying medium condenses on the surface of the evaporator 5 to form condensed water, which flows into the collecting tray, and is collected in the condensed water pipe 12 to be discharged out of the dryer 3.
Further, the drying system also comprises a filter press 1; the outlet of the filter press 1 is connected to the inlet of the dryer 3. The filter press 1 can pretreat the material 11 to be dried to achieve a moisture content which is more suitable for the treatment of the dryer 3, thereby being beneficial to improving the drying efficiency.
On the basis of the foregoing embodiments, further, this embodiment provides a heat pump drying method based on the heat pump drying system described in any one of the foregoing embodiments, where the heat pump drying method includes: heating and dehumidifying a drying medium in the dryer 3 by using a carbon dioxide heat pump system to dry the substance 11 to be dried; a multistage air cooler 2 and a multistage evaporator 5 are arranged in the carbon dioxide heat pump system to carry out multistage drying treatment on a substance 11 to be dried; when the material 11 to be dried is subjected to multi-stage drying treatment, circulating air is respectively formed to circularly dry the material 11 to be dried; the operating frequency of the compressor 4 in the carbon dioxide heat pump system is 0-50Hz.
On the basis of the embodiment, further, a heat pump drying system is used for drying sludge, the heat pump drying system comprises a filter press 1, a multi-layer belt dryer 3 and a carbon dioxide heat pump system, and an outlet of the filter press 1 is connected with an inlet of the multi-layer belt dryer 3 through a conveying device; the carbon dioxide heat pump system comprises a compressor 4, a first air cooler 2, a second air cooler 2, a third air cooler 2, a throttle valve 6, a first evaporator 5, a second evaporator 5 and a third evaporator 5 which are connected in sequence; the outlet of the third air cooler 2 exchanges heat with the outlet of the third evaporator 5 through a heat exchanger. The system also comprises 6 high-temperature-resistant circulating fans 10, a heat insulation material is arranged between each pair of air coolers 2 and the evaporator 5, and condensed water generated after the evaporator 5 dehumidifies is collected together and then discharged out of the system.
The present embodiment provides a heat pump drying method using the heat pump drying system described in the foregoing embodiment, including: generating hot air with the temperature of more than 100 ℃ by utilizing a carbon dioxide heat pump system; the operating frequency of the compressor 4 in the carbon dioxide heat pump system may be between 0-50 Hz; the three-stage air cooler 2 is utilized to fully utilize the heat generated by the carbon dioxide, so that the outlet temperature of the air cooler 2 is reduced as much as possible, and the circulation efficiency is improved; the sludge on the conveyor belt is dried circularly by a high temperature resistant fan 10 between heat insulating materials.
Firstly, the filter press 1 can be used for mechanically compressing and filtering the sludge with the water content of 80-90% to 50-80% in cake or strip shape, and then the sludge is conveyed to the inlet of the multi-layer belt dryer 3 through the conveying device. Then the compressor 4 is started, the carbon dioxide heat pump system is started, and the compressor 4 can operate in a variable frequency mode between 0 and 50Hz. The heat in the air cooler 2 is continuously exchanged by a high temperature resistant circulating fan 10 between heat insulating materials to form a high temperature heat pump and circulate between the multi-layer belt dryers 3. The condensed water in the evaporator 5 is discharged out of the system via a pipe. The dried sludge is transported out of the system (not shown in fig. 1) via a conveyor mechanism.
The air outlet temperature of the heat pump drying system is higher than that of a conventional heat pump drying system, and the heat released by carbon dioxide can be utilized to the maximum extent, so that the efficiency of the carbon dioxide heat pump system is effectively improved, and the energy is further saved; the heat exchange capability of the carbon dioxide gas cooler 2 is fully utilized, the outlet temperature of the gas cooler 2 is reduced, the efficiency of the carbon dioxide heat pump is improved, and the energy consumption is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A sludge heat pump drying system, comprising: a dryer and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor, an air cooling assembly, a throttle valve and an evaporation assembly which are sequentially connected, wherein a working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling assembly and the evaporation assembly are arranged in the dryer, the compressor and the throttle valve are arranged outside the dryer, the air cooling assembly comprises a plurality of air coolers connected in series, and the evaporation assembly comprises a plurality of evaporators connected in series;
the inside of the dryer is provided with a plurality of layers of conveying belts for conveying substances to be dried, the air cooling assembly is arranged above the conveying belt at the uppermost layer, and the evaporation assembly is arranged below the conveying belt at the lowermost layer;
the dryer also comprises a plurality of first heat insulation layers, wherein the first heat insulation layers divide the interior of the dryer into a plurality of sections along the conveying direction of the conveyor belt, and any section comprises one air cooler and one evaporator;
the top and the bottom of every interval set up a fan respectively, the fan passes through first insulating layer is fixed, the fan is used for driving the drying medium circulation flow that is located this interval.
2. The sludge heat pump drying system of claim 1 wherein a plurality of said air coolers and a plurality of said evaporators are disposed in one-to-one correspondence up and down, and wherein a plurality of said air coolers and a plurality of said evaporators are uniformly distributed along a conveying direction of said conveyor belt, respectively.
3. A sludge heat pump drying system according to claim 1 or 2 further comprising a regenerator through which the connection between the throttle valve and the air cooler adjacent to the throttle valve and the connection between the compressor and the evaporator adjacent to the compressor respectively flow for heat exchange.
4. A sludge heat pump drying system according to claim 3 wherein the regenerator is located on one side of the dryer and a second insulating layer is provided between the regenerator and the conveyor belt and inside the dryer.
5. The sludge heat pump drying system of claim 1 wherein the evaporator surface is provided with condensate collection pans, the condensate collection pans of the evaporator surface being in communication with condensate pipes, respectively.
6. The sludge heat pump drying system of claim 1 further comprising a filter press; the outlet of the filter press is connected with the inlet of the dryer.
7. A method of sludge heat pump drying based on the sludge heat pump drying system of any of the preceding claims 1-6, comprising:
heating and dehumidifying a drying medium in the dryer by using a carbon dioxide heat pump system so as to dry a substance to be dried;
a multistage air cooler and a multistage evaporator are arranged in the carbon dioxide heat pump system so as to carry out multistage drying treatment on a substance to be dried;
when the material to be dried is subjected to multistage drying treatment, circulating air is respectively formed to circularly dry the material to be dried;
the operating frequency of the compressor in the carbon dioxide heat pump system is 0-50Hz.
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| CN201911106098.8A CN112797777B (en) | 2019-11-13 | 2019-11-13 | Sludge heat pump drying system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911106098.8A CN112797777B (en) | 2019-11-13 | 2019-11-13 | Sludge heat pump drying system and method |
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| CN203744593U (en) * | 2014-01-21 | 2014-07-30 | 广州九恒新能源有限公司 | Air energy carbon dioxide heat pump type drier |
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| CN109282521A (en) * | 2017-07-19 | 2019-01-29 | 十堰市旺朝新能源科技有限公司 | A kind of heat pump |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2268909Y (en) * | 1996-05-21 | 1997-11-26 | 抚顺石油化工公司腈纶化工厂 | Polymer drying apparatus |
| EP2489775A1 (en) * | 2011-02-18 | 2012-08-22 | Electrolux Home Products Corporation N.V. | A heat pump laundry dryer and a method for operating a heat pump laundry dryer |
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