Sludge drying system

Abstract

The utility model relates to the technical field of sludge drying, in particular to a sludge drying system. The sludge drying system comprises a drying machine used for drying sludge. A first medium passage of the dryer is used for circulating a first heating medium. The heat accumulator comprises a heat accumulator body, a semiconductor thermoelectric structure, a first heat exchange channel and a second heat exchange channel. When the semiconductor thermoelectric structure is powered on, the refrigeration end absorbs heat in the second heat exchange channel, and heat generated by the heating end is transmitted to the heat accumulator. And when the first heat medium is introduced into the first heat exchange channel, the heat of the heat accumulator is transferred to the first heat medium. When a first heating medium is introduced into the first heat exchanger, heat of the external environment is transferred to the first heating medium; a second heat exchanger; when a second heating medium is introduced into the second heat exchanger, heat of the external environment is transferred to the second heating medium. In this way, the heat storage efficiency and the energy density of the heat accumulator can be improved, meanwhile, the energy cost is reduced, and peak-valley arbitrage is achieved.

Description

Technical Field

[0001] This application relates to the field of sludge drying technology, and more particularly to a sludge drying system. Background Technology

[0002] Sludge drying is a process that reduces the moisture content of sludge through physical or chemical methods, aiming to reduce sludge volume. This facilitates sludge transportation and also benefits subsequent treatments such as sludge incineration, landfilling, or resource utilization.

[0003] Sludge drying technologies are mainly divided into thermal drying, mechanical dewatering, and natural drying. Among them, thermal drying technology evaporates moisture through an external heat source, which can significantly reduce the water content of sludge. Thermal drying technology has high thermal efficiency, but it also has the problem of high energy consumption. At the same time, thermal drying technology has high cost and low economic efficiency, and there is considerable room for energy efficiency optimization. Utility Model Content

[0004] To address the aforementioned issues, this application provides a sludge drying system.

[0005] The sludge drying system described in this application includes:

[0006] A dryer for drying sludge; the dryer includes a first medium passage for circulating a first heat medium.

[0007] A heat storage device includes a heat storage body, a semiconductor thermoelectric structure, a first heat exchange channel, and a second heat exchange channel. The heat storage body stores heat. The semiconductor thermoelectric structure has a cooling end and a heating end. When the semiconductor thermoelectric structure is energized, the cooling end absorbs heat from the second heat exchange channel, and the heat generated by the heating end is transferred to the heat storage body. The output port of the first heat exchange channel is connected to the input port of the first medium passage. When the first heat medium is introduced into the first heat exchange channel, the heat from the heat storage body is transferred to the first heat medium. The second heat exchange channel is used to circulate a second heat medium.

[0008] The first heat exchanger has its inlet connected to the outlet of the first medium passage, and its outlet connected to the inlet of the first heat exchange channel; when the first heat exchanger is supplied with the first heat medium, heat from the external environment is transferred to the first heat medium.

[0009] The second heat exchanger; the inlet of the second heat exchanger is connected to the outlet of the second heat exchange channel, and the outlet of the second heat exchanger is connected to the inlet of the second heat exchange channel; when the second heat medium is introduced into the second heat exchanger, the heat from the external environment is transferred to the second heat medium.

[0010] Optionally, the sludge drying system further includes a heat pump;

[0011] The heat pump has a heating section and a cooling section; the input port of the heating section is connected to the output port of the first heat exchanger, and the output port of the heating section is connected to the input port of the first heat exchange channel; the input port of the cooling section is connected to the output port of the first medium passage, and the output port of the cooling section is connected to the input port of the first heat exchanger.

[0012] Optionally, the sludge drying system further includes a third heat exchanger;

[0013] The third heat exchanger includes a third heat exchange channel and a fourth heat exchange channel; the inlet of the third heat exchange channel is connected to the outlet of the first medium passage, and the outlet of the third heat exchange channel is connected to the inlet of the first heat exchanger.

[0014] The inlet of the fourth heat exchange channel is connected to the outlet of the first heat exchanger, and the outlet of the fourth heat exchange channel is connected to the inlet of the first heat exchange channel.

[0015] When the first heat medium is introduced into the third heat exchange channel and the fourth heat exchange channel, the heat of the first heat medium in the third heat exchange channel is transferred to the first heat medium in the fourth heat exchange channel.

[0016] Optionally, the third heat exchanger is connected between the heat pump and the first heat exchanger; the output port of the third heat exchange channel is connected to the input port of the refrigeration unit; and the output port of the fourth heat exchange channel is connected to the input port of the heating unit.

[0017] Optionally, the dryer further includes a second medium passage for circulating a third heat medium for drying sludge;

[0018] When the first heat medium is introduced into the first medium passage and the third heat medium is introduced into the second medium passage, the heat of the first heat medium is transferred to the third heat medium.

[0019] Optionally, the sludge drying system further includes a fourth heat exchanger;

[0020] The fourth heat exchanger includes a fifth heat exchange channel and a sixth heat exchange channel; the inlet of the fifth heat exchange channel is connected to the outlet of the second medium passage, and the outlet of the fifth heat exchange channel is connected to the inlet of the second medium passage.

[0021] The inlet of the sixth heat exchange channel is connected to the outlet of the first heat exchanger, and the outlet of the sixth heat exchange channel is connected to the inlet of the first heat exchange channel.

[0022] When the third heat medium is introduced into the fifth heat exchange channel and the first heat medium is introduced into the sixth heat exchange channel, the heat of the third heat medium in the fifth heat exchange channel is transferred to the first heat medium in the sixth heat exchange channel.

[0023] Optionally, the fourth heat exchanger is connected between the third heat exchanger and the first heat exchanger; the output port of the sixth heat exchange channel is connected to the input port of the fourth heat exchange channel.

[0024] Optionally, the heat storage body has flow through holes, and the first heat exchange channel is the cavity of the flow through holes.

[0025] Optionally, the heat accumulator includes a first heat transfer tube, the first heat exchange channel being the cavity of the first heat transfer tube; the first heat transfer tube is in contact with the heat storage body.

[0026] Optionally, the heat storage device includes a second heat transfer tube, and the second heat exchange channel is the cavity of the second heat transfer tube; the second heat transfer tube is in contact with the cooling end of the semiconductor thermoelectric structure.

[0027] Optionally, a heat-conducting structure is provided between the heat storage body and the heating end of the semiconductor thermoelectric structure; the heat-conducting structure is in contact with both the heat storage body and the heating end of the semiconductor thermoelectric structure.

[0028] Optionally, the heat accumulator includes an insulation shell;

[0029] The heat-insulating shell has a heat-insulating inner cavity, and the heat storage body and the semiconductor thermoelectric structure are both located inside the heat-insulating inner cavity.

[0030] Optionally, the fourth heat exchanger has a condensation outlet, which is connected to the fifth heat exchange channel.

[0031] In some implementations of this application, the sludge drying system includes a dryer, a heat accumulator, a first heat exchanger, and a second heat exchanger. The dryer is used to dry sludge and has a first medium passage. The first medium passage can be circulated with a first heat medium to provide heat for drying the sludge.

[0032] The heat accumulator includes a heat storage body, a semiconductor thermoelectric structure, a first heat exchange channel, and a second heat exchange channel. The heat storage body stores heat, and the first heat exchange channel allows a first heat medium to flow through it. When the first heat medium flows through the first heat exchange channel, the heat from the heat storage body heats the first heat medium, raising its temperature before it flows into the first medium passage in the dryer. The second heat exchange channel allows a second heat medium to flow through it. When the semiconductor thermoelectric structure is energized, its cooling end absorbs heat from the second heat medium in the second heat exchange channel, while its heating end generates heat and transfers it to the heat storage body for storage.

[0033] The first heat exchanger can exchange heat with the external environment, allowing the first heat medium inside the first heat exchanger to absorb heat from the outside before flowing into the first heat exchange channel. Similarly, the second heat exchanger can exchange heat with the external environment, allowing the second heat medium inside the second heat exchanger to absorb heat from the outside before flowing into the second heat exchange channel.

[0034] In the sludge drying system described in this application embodiment, the heat storage body can utilize a semiconductor thermoelectric structure to extract heat from the second heat medium. Compared to traditional solid heat storage bodies, this improves the heat storage efficiency of the heat storage unit, while also increasing its energy density and reducing its space requirements. The semiconductor thermoelectric structure can use off-peak or green electricity to generate heat. After absorbing heat, the heat storage body can release it during peak electricity hours to reduce energy costs and achieve peak-valley arbitrage. The first heat exchanger absorbs heat from the outside to raise the temperature of the first heat medium, and the second heat exchanger absorbs heat from the outside to raise the temperature of the second heat medium. This facilitates the utilization of waste heat from the external environment, thereby improving energy efficiency.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0036] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a structural diagram of the sludge drying system described in this application;

[0038] Figure 2 yes Figure 1 Schematic diagram of the structure of the heat accumulator;

[0039] Figure 3 yes Figure 1 A schematic diagram showing the connection between the medium-sized heat pump and the first heat exchanger, the third heat exchanger, the fourth heat exchanger, and the heat accumulator.

[0040] Figure 4 yes Figure 2 A schematic diagram of the structure under another implementation method;

[0041] Reference numerals: 1. Dryer; 11. First medium passage; 12. Second medium passage; 2. Heat accumulator; 2a. First heat exchange channel; 2b. Second heat exchange channel; 21. Heat storage body; 211. Flow through hole; 22. Semiconductor thermoelectric structure; 22a. Cooling end; 22b. Heating end; 23. First heat transfer tube; 24. Second heat transfer tube; 25. Thermal conduction structure; 26. Insulation shell; 261. Insulation cavity; 3. First heat exchanger; 4. Second heat exchanger; 5. Heat pump; 51. Heating section; 52. Cooling section; 53. Compressor; 54. Expansion valve; 6. Third heat exchanger; 61. Third heat exchange channel; 62. Fourth heat exchange channel; 7. Fourth heat exchanger; 71. Fifth heat exchange channel; 72. Sixth heat exchange channel; 73. Condensate outlet; 8. Control valve; 100. Wastewater. Detailed Implementation

[0042] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0043] Sludge drying is a process that reduces the moisture content of sludge through physical or chemical methods, aiming to reduce sludge volume. This facilitates sludge transportation and also benefits subsequent treatments such as sludge incineration, landfilling, or resource utilization.

[0044] Sludge drying technologies are mainly divided into thermal drying, mechanical dewatering, and natural drying. Mechanical dewatering refers to using equipment such as centrifuges and filter presses to separate the solid and liquid components of sludge through physical means to achieve the purpose of sludge drying. This method has high energy consumption and a long drying cycle. At the same time, mechanical dewatering is difficult to achieve ideal sludge drying results, and the dried sludge still has a high moisture content.

[0045] Natural drying utilizes natural solar and wind energy to evaporate moisture from sludge. The equipment used in natural drying is simple in structure, has low energy costs, and is easy to maintain and operate. However, natural drying takes a very long time and is easily affected by weather conditions. The equipment also requires a relatively large area, leading to significant site costs.

[0046] Compared to the previous two sludge drying technologies, thermal drying technology has a significant advantage in drying efficiency. Thermal drying typically utilizes an external heat source to evaporate the moisture in the sludge, thus drying sludge with a moisture content of 80% to 10%-40%. Existing thermal drying technologies can be divided into two types: direct thermal drying, which uses hot air to directly contact the sludge for drying; and indirect thermal drying, which uses equipment such as rotary kilns and belt dryers, offering high drying efficiency but easily generating waste gas and dust pollution. Indirect thermal drying uses heat exchangers to heat the sludge, producing no waste gas pollution and achieving a thermal efficiency of 60%-80%. Commonly used equipment for indirect thermal drying includes thin-layer dryers and paddle dryers.

[0047] Both direct and indirect thermal drying technologies require significant amounts of thermal energy. This means that thermal drying technologies generally have high energy consumption and considerable room for energy efficiency optimization. Furthermore, the equipment costs for sludge thermal drying are high, resulting in relatively low economic viability for this technology.

[0048] Therefore, this application provides a sludge drying system to overcome many problems existing in the prior art.

[0049] refer to Figure 1 The sludge drying system described in this application includes a dryer 1, a heat accumulator 2, a first heat exchanger 3, and a second heat exchanger 4. The dryer 1 is the equipment used for drying sludge and has a first medium passage 11 inside. During sludge drying, a first heat medium can be introduced into the first medium passage 11. The first heat medium provides heat to the dryer 1. In this application embodiment, the dryer 1 can be a rotary kiln, a belt dryer, a thin-layer dryer, a paddle dryer, etc. In other words, the first heat medium can be a gas or a liquid. When the first heat medium is a gas, air is preferably used to reduce the operating cost of the sludge drying system. Of course, nitrogen, carbon dioxide, or other gases can also be used as the first heat medium. When the first heat medium is a liquid, water is preferably used, which can also reduce the operating cost of the sludge drying system. Of course, mineral oil, ethylene glycol, or other liquids can also be used as the first heat medium.

[0050] When a gas is used as the first heat medium, the first medium passage 11 is the chamber inside the dryer 1 that supplies gas flow and purges the sludge. As the first heat medium flows through the first medium passage 11, it exchanges heat with the sludge and simultaneously carries away the moisture evaporated from the sludge. When a liquid is used as the first heat medium, the first medium passage 11 can be the piping of a heat exchanger inside the dryer 1. As the first heat medium flows through the first medium passage 11, it can directly exchange heat with the sludge to evaporate the moisture. Alternatively, as the first heat medium flows through the first medium passage 11, it can also exchange heat with the gas in the dryer 1, making the gas in the dryer 1 a high-temperature gas suitable for drying the sludge.

[0051] refer to Figure 2 The heat accumulator 2 is a device for storing heat. In the embodiments of this application, the heat accumulator 2 includes a heat storage body 21, a semiconductor thermoelectric structure 22, a first heat exchange channel 2a, and a second heat exchange channel 2b.

[0052] The heat storage body 21 can generally be made of phase change materials or solid heat storage materials. For example, the heat storage body 21 can be a sealed container holding phase change materials such as molten salt, hydrated salt, or paraffin. The heat storage body 21 can absorb heat, causing the phase change material inside to undergo a phase change and store the heat. Alternatively, the heat storage body 21 can also be a solid structure made of solid heat storage materials such as ceramics or cast iron. The heat storage body 21 can absorb heat from adjacent structures and store the heat inside itself.

[0053] The semiconductor thermoelectric structure 22 is a physical structure made of semiconductor thermoelectric materials, having a cooling end 22a and a heating end 22b. Specifically, the semiconductor thermoelectric structure 22 utilizes the Peltier effect and is made of both N-type and P-type semiconductor materials. When a direct current is applied to the semiconductor thermoelectric structure 22, as the current passes through the junction formed by the N-type and P-type semiconductor materials, charge carriers (electrons or holes) cross the junction under the drive of the electric field. When electrons flow from the N-type semiconductor to the P-type semiconductor, they carry heat into the P-type semiconductor, causing the temperature of the P-type semiconductor to rise. When holes flow from the P-type semiconductor to the N-type semiconductor, it is equivalent to the reverse flow of electrons, also accompanied by heat migration. At this time, a portion of the semiconductor thermoelectric structure 22 absorbs heat, which is the cooling end 22a of the semiconductor thermoelectric structure 22; another portion of the semiconductor thermoelectric structure 22 releases heat, which is the heating end 22b of the semiconductor thermoelectric structure 22.

[0054] refer to Figure 1 The first heat exchange channel 2a is a structure connected to the first medium passage 11, through which the first heat medium can flow into the first medium passage 11. The first heat exchange channel 2a can be a cavity on the heat storage body 21, a pipe passing through the heat storage body 21, or a pipe attached to the surface of the heat storage body 21. When the first heat medium flows through the first heat exchange channel 2a, it can simultaneously exchange heat with the heat storage body 21. At this time, the heat inside the heat storage body 21 is transferred to the first heat medium and enters the dryer 1 along with the first heat medium.

[0055] refer to Figure 1The second heat exchange channel 2b is a structure through which the second heat medium flows. The first and second heat mediums can be made of the same material or different materials. Preferably, in this embodiment, both the first and second heat mediums are water. The second heat exchange channel 2b can be a cavity on the cooling end 22a of the semiconductor thermoelectric structure 22, a pipe passing through the cooling end 22a of the semiconductor thermoelectric structure 22, or a pipe attached to the surface of the cooling end 22a of the semiconductor thermoelectric structure 22. When the second heat medium flows through the second heat exchange channel 2b, direct current can be simultaneously supplied to the semiconductor thermoelectric structure 22. At this time, under the cooling effect of the cooling end 22a, the temperature of the second heat medium is transferred to the heating end 22b via the cooling end 22a. The heat storage body 21 and the heating end 22b of the semiconductor thermoelectric structure 22 can be in direct contact or indirect contact through other structures, so that the heat generated by the heating end 22b can be transferred to the heat storage body 21 and stored.

[0056] refer to Figure 1 The first heat exchanger 3 is a structure used for heat exchange with the external environment, and a first heat medium flows inside it. In this embodiment, the external environment can be an atmospheric environment or a liquid water environment. Preferably, the external environment referred to in this embodiment is a sewage 100 environment. That is, during use, sewage 100 is introduced into the first heat exchanger 3, and the pipes in the first heat exchanger 3 carrying the first heat medium can exchange heat with the sewage 100 to absorb the heat in the sewage 100. The inlet of the first heat exchanger 3 is connected to the outlet of the first medium passage 11, and the outlet of the first heat exchanger 3 is connected to the inlet of the first heat exchange channel 2a. In other words, the first heat medium entering the first heat exchanger 3 is a low-temperature or medium-temperature medium that has released heat in the dryer 1. After the first heat medium flows out of the first heat exchanger 3, it enters the first heat exchange channel 2a to continue absorbing the heat accumulated in the heat storage body 21, and finally flows back into the first medium passage 11 of the dryer 1.

[0057] refer to Figure 1The second heat exchanger 4 is also a structure used for heat exchange with the external environment, and a second heat medium flows inside it. In this embodiment, the second heat exchanger 4 and the first heat exchanger 3 can be in the same external environment or in different external environments. Preferably, in this embodiment, both the first heat exchanger 3 and the second heat exchanger 4 are in the environment of sewage 100. That is, during use, sewage 100 is introduced into the second heat exchanger 4, and the pipes in the second heat exchanger 4 carrying the second heat medium can exchange heat with the sewage 100 to absorb the heat in the sewage 100. The inlet of the second heat exchanger 4 is connected to the outlet of the second heat exchange channel 2b, and the outlet of the second heat exchanger 4 is connected to the inlet of the second heat exchange channel 2b. When the semiconductor thermoelectric structure 22 is energized with direct current, the heat of the second heat medium in the second heat exchange channel 2b is absorbed by the cooling end 22a of the semiconductor thermoelectric structure 22. The second heat medium, cooled by the cooling end 22a, flows into the second heat exchanger 4 and continues to exchange heat with the sewage 100 in the second heat exchanger 4. After absorbing heat from the sewage 100, the second heat medium flows back into the second heat exchange channel 2b and continues to exchange heat with the cooling end 22a of the semiconductor thermoelectric structure 22.

[0058] The wastewater 100 mentioned in this embodiment can be industrial wastewater, domestic sewage 100, or other waste resources. This allows the heat resources in the wastewater 100 to be reused, thereby improving energy efficiency.

[0059] In practical use, the sludge drying system described in this application embodiment can supply electricity to the semiconductor thermoelectric structure 22 during off-peak hours or use green electricity. At this time, the semiconductor thermoelectric structure 22, under the transfer of heat from the second heat exchanger 4 and the second heat medium, can continuously absorb heat from the wastewater 100 and store it in the heat storage body 21 of the heat storage tank 2. Compared to integrating a heat pump 5 or similar structure into the heat storage tank 2 to absorb heat from the wastewater 100, using the semiconductor thermoelectric structure 22 can significantly reduce the space occupied by the heat storage tank 2. Therefore, this helps to reduce the space and material costs of the heat storage tank 2. Simultaneously, compared to traditional heat storage tanks 2 that rely solely on heat conduction for heat storage, the semiconductor thermoelectric structure 22 can provide more heat to the heat storage body 21. This helps to increase the heat stored inside the heat storage tank 2, thereby increasing the energy density of the heat storage tank 2. While the heat accumulator 2 stores heat, the first heat exchanger 3 can continuously exchange heat between the first heat medium and the sewage 100. The first heat medium flows through the heat accumulator 2 and is heated before flowing into the dryer 1, so as to ensure that the dryer 1 continuously has a high-temperature first heat medium flowing in.

[0060] During peak electricity demand, the power supply to the semiconductor thermoelectric structure 22 can be stopped. A control valve 8 can be installed between the inlet of the second heat exchanger 4 and the outlet of the second heat exchange channel 2b, or between the outlet of the second heat exchanger 4 and the inlet of the second heat exchange channel 2b. The control valve 8 is simultaneously shut off to stop the circulation of the second heat medium. At this time, the heat accumulated in the heat storage body 21 continues to dissipate outward and simultaneously heats the first heat medium flowing through the heat storage body 21. This ensures that a high-temperature first heat medium continues to flow into the dryer 1 during peak electricity demand. In other words, the sludge drying system described in this application can provide a structural basis for peak-valley arbitrage. By adopting the sludge drying system described in this application, it is possible to achieve peak-valley arbitrage operation by storing heat in the heat storage body 2 during off-peak electricity demand and releasing heat in the heat storage body 2 during peak electricity demand, while ensuring a continuous flow of high-temperature first heat medium into the dryer 1, thereby significantly improving the profitability and economy of the sludge drying system.

[0061] In some embodiments of this application, the sludge drying system further includes a heat pump 5. A heat pump 5 is a device that transfers heat from a low-temperature heat source to a high-temperature environment by inputting a small amount of electrical or mechanical energy. During the heat transfer process, the heat pump 5 does not directly generate heat. Existing heat pumps 5 typically utilize the phase change cycle of a refrigerant to achieve heat transfer, specifically including four structures: an evaporator, a compressor 53, a condenser, and an expansion valve 54. The evaporator is the cooling section 52 of the heat pump 5, and the condenser is the heating section 51. The inlet of the heating section 51 is connected to the outlet of the first heat exchanger 3, and the outlet of the heating section 51 is connected to the inlet of the first heat exchange channel 2a; the inlet of the cooling section 52 is connected to the outlet of the first medium passage 11, and the outlet of the cooling section 52 is connected to the inlet of the first heat exchanger 3.

[0062] refer to Figure 3 The evaporator, compressor 53, condenser, and expansion valve 54 are connected through another independent working fluid passage. This working fluid passage typically contains a low-pressure, room-temperature liquid working fluid such as Freon. In the sludge drying system described in this embodiment, the first heat medium flowing out of the first medium passage 11 of the dryer 1 flows into the evaporator of the heat pump 5. The low-pressure, room-temperature liquid working fluid absorbs heat from the first heat medium within the evaporator. After absorbing heat, the first heat medium flows into the first heat exchanger 3, absorbs heat from the external environment within the first heat exchanger 3, and then flows into the condenser of the heat pump 5.

[0063] Simultaneously, the heat-absorbing liquid working fluid transforms into a high-temperature, low-pressure gaseous working fluid. This high-pressure, low-pressure gaseous working fluid flows through compressor 53 and is compressed into a high-temperature, high-pressure gaseous working fluid. This high-temperature, high-pressure gaseous working fluid enters the condenser, undergoes a phase change, and releases its heat to the first heat medium within the condenser. The heat-absorbing first heat medium flows into the first heat exchange channel 2a of the heat accumulator 2 and continues to absorb heat from the heat accumulator 2, finally flowing into the first medium passage 11 of the dryer 1. Meanwhile, the heat-releasing gaseous working fluid transforms into a room-temperature, high-pressure liquid working fluid. This room-temperature, high-pressure liquid working fluid flows through expansion valve 54 and becomes a room-temperature, low-pressure liquid working fluid. This room-temperature, low-pressure liquid working fluid re-enters the evaporator and undergoes a phase change to absorb heat.

[0064] The heat pump 5 can recover the heat from the first heat medium flowing out of the dryer 1 and redistribute the heat to the first heat medium flowing out of the first heat exchanger 3, thus raising its temperature. This avoids heat waste and improves heat utilization. At the same time, the heat pump 5 can reduce the temperature of the first heat medium entering the first heat exchanger 3, allowing the first heat medium to absorb more heat within the first heat exchanger 3, thereby improving the waste heat recovery efficiency of the sludge drying system.

[0065] refer to Figure 1 In some embodiments of this application, the sludge drying system further includes a third heat exchanger 6.

[0066] The third heat exchanger 6 is internally provided with a third heat exchange channel 61 and a fourth heat exchange channel 62. The inlet of the third heat exchange channel 61 is connected to the outlet of the first medium passage 11, and the outlet of the third heat exchange channel 61 is connected to the inlet of the first heat exchanger 3, so that the first heat medium flowing out of the dryer 1 can flow into the third heat exchange channel 61 in the third heat exchanger 6, and then flow into the first heat exchanger 3 through the third heat exchange channel 61.

[0067] The inlet of the fourth heat exchange channel 62 is connected to the outlet of the first heat exchanger 3, and the outlet of the fourth heat exchange channel 62 is connected to the inlet of the first heat exchange channel 2a. The first heat medium flowing out of the first heat exchanger 3 can flow into the fourth heat exchange channel 62, and then flow into the first heat exchange channel 2a of the heat storage 2 via the fourth heat exchange channel 62.

[0068] During operation of the sludge drying system described in this embodiment, the first heat medium in the third heat exchange channel 61 flows out from the dryer 1, while the first heat medium in the fourth heat exchange channel 62 flows out from the first heat exchanger 3. Therefore, the temperature of the first heat medium in the third heat exchanger 6 is higher than the temperature of the first heat medium in the fourth heat exchange channel 62. The heat from the first heat medium in the third heat exchange channel 61 can be transferred to the first heat medium in the fourth heat exchange channel 62. The first heat medium in the fourth heat exchange channel 62 flows into the first heat exchange channel 2a of the heat accumulator 2 and continues to absorb heat, then re-enters the dryer 1 for heating.

[0069] In this embodiment, the third heat exchange channel 61 and the fourth heat exchange channel 62 can be the inner cavities of two independent pipes inside the third heat exchanger 6. The two independent pipes are in contact, or a heat-conducting structure 25 is provided between them, so that the first heat medium in the third heat exchange channel 61 can exchange heat with the first heat medium in the fourth heat exchange channel 62. Alternatively, one of the third heat exchange channel 61 and the fourth heat exchange channel 62 can be the inner cavity of the third heat exchanger 6, and the other can be a pipe passing through the inner cavity of the third heat exchanger 6. In this embodiment, the structure of the third heat exchanger 6 can be configured according to actual needs, and will not be described in detail here.

[0070] refer to Figure 1 In some embodiments of this application, a third heat exchanger 6 is connected between the heat pump 5 and the first heat exchanger 3.

[0071] Specifically, the inlet of the third heat exchange channel 61 is connected to the outlet of the first medium passage 11, and the outlet of the third heat exchange channel 61 is connected to the inlet of the refrigeration unit 52. The outlet of the refrigeration unit 52 is connected to the inlet of the first heat exchanger 3, and the outlet of the first heat exchanger 3 is connected to the inlet of the fourth heat exchange channel 62. The outlet of the fourth heat exchange channel 62 is connected to the inlet of the heating unit 51, and the outlet of the heating unit 51 is connected to the inlet of the first heat exchange channel 2a.

[0072] The first heat medium flowing out of the dryer 1 can flow into the third heat exchange channel 61 in the third heat exchanger 6. After exchanging heat with the first heat medium in the fourth heat exchange channel 62 in the third heat exchange channel 61, it flows into the refrigeration section 52 of the heat pump 5. The first heat medium flowing out of the refrigeration section 52 of the heat pump 5 flows into the first heat exchanger 3 and absorbs heat from the external environment, and then flows into the fourth heat exchange channel 62 of the third heat exchanger 6. After absorbing heat in the fourth heat exchange channel 62, the first heat medium enters the heating section 51 of the heat pump 5 to continue absorbing heat, and then flows into the first heat exchange channel 2a to continue absorbing heat from the heat storage body 21, and finally flows back into the first medium passage 11 of the dryer 1.

[0073] In the above process, the first heat medium flowing into the heating section 51 of the heat pump 5 originates from the fourth heat exchange channel 62 of the third heat exchanger 6. Before flowing into the heating section 51, the first heat medium has already absorbed some heat. This reduces the amount of heat the first heat medium needs to absorb to reach the predetermined temperature within the heating section 51, thereby reducing the energy consumption of the heat pump 5. Since heat exchange inside the third heat exchanger 6 can occur spontaneously, the reduction in the energy consumption of the heat pump 5 can reduce the energy consumption of the entire sludge drying system.

[0074] refer to Figure 1 In some embodiments of this application, the dryer 1 further includes a second medium passage 12. The second medium passage 12 is used to circulate a third heat medium, which is used to dry the sludge. When the first heat medium flows into the first medium passage 11 and the third heat medium flows into the second medium passage 12, the heat of the first heat medium is transferred to the third heat medium. In other words, the first heat medium and the third heat medium can exchange heat within the dryer 1, with the first heat medium providing heat energy to the third heat medium, and the third heat medium drying the sludge. The first heat medium and the second heat medium can be the same material or different materials. Preferably, in the embodiments of this application, the first heat medium is water and the third heat medium is air. This helps to reduce the operating cost of the sludge drying system described in the embodiments of this application.

[0075] In this embodiment, the structure of the dryer 1 can be configured according to actual needs; for example, the dryer 1 can be a fluidized bed. The dryer 1 has a casing, inside which a vibrating plate for laying sludge is installed, and a vibration source device is installed below the vibrating plate. Under the drive of the vibration source device, the vibrating plate can vibrate. The sludge is transferred to the vibrating plate via a conveyor belt or conveyor bucket and vibrates synchronously with the vibrating plate. An air inlet pipe and an air outlet pipe are provided on the casing, and the air inlet pipe, the air outlet pipe, and the inner cavity of the casing constitute the aforementioned second medium passage 12. One of the air inlet pipe and the air outlet pipe is connected to an air pump so that air can be driven to flow in the second medium passage 12. The dryer 1 also has a hot water pipe, the inner cavity of which is the first medium passage 11. The hot water pipe is installed in the air outlet pipe, the air inlet pipe, or the inner cavity of the casing to heat the air in the second medium passage 12. One end of the hot water pipe is connected to the first heat exchange channel 2a of the heat accumulator 2, and the other end is connected to the third heat exchange channel 61 of the third heat exchanger 6. The hot water pipe can be connected to a water pump at the same time, and one of the air inlet pipe and air outlet pipe can be connected to an air pump so that the power for fluid flow can be obtained through the water pump and the air pump.

[0076] refer to Figure 1In some embodiments of this application, the sludge drying system further includes a fourth heat exchanger 7. The fourth heat exchanger 7 includes a fifth heat exchange channel 71 and a sixth heat exchange channel 72. The inlet of the fifth heat exchange channel 71 is connected to the outlet of the second medium passage 12, and the outlet of the fifth heat exchange channel 71 is connected to the inlet of the second medium passage 12. The inlet of the sixth heat exchange channel 72 is connected to the outlet of the first heat exchanger 3, and the outlet of the sixth heat exchange channel 72 is connected to the inlet of the first heat exchange channel 2a.

[0077] After the third heat medium flows out of the second medium passage 12 of the dryer 1, it can enter the fifth heat exchange channel 71 of the fourth heat exchanger 7, and then flow back to the second medium passage 12 from the fifth heat exchange channel 71. Simultaneously, the first heat medium flowing out of the first heat exchanger 3 can enter the sixth heat exchange channel 72, and then flow into the first heat exchange channel 2a. During this process, since the temperature of the third heat medium in the fifth heat exchange channel 71 is usually higher, the heat of the third heat medium can be transferred to the first heat medium in the sixth heat exchange channel 72. In other words, the heat of the third heat medium flowing out of the dryer 1 can be recovered into the first heat medium in the fourth heat exchanger 7. This improves the heat utilization efficiency and effectively avoids heat waste. At the same time, this prevents the third heat medium flowing out of the dryer 1 from being directly discharged into the external environment, thereby avoiding environmental pollution.

[0078] In this embodiment, the fifth heat exchange channel 71 and the sixth heat exchange channel 72 can be the inner cavities of two independent pipes inside the fourth heat exchanger 7. The two independent pipes are in contact, or a heat-conducting structure 25 is provided between them, so that the third heat medium in the fifth heat exchange channel 71 can exchange heat with the first heat medium in the sixth heat exchange channel 72. Alternatively, one of the fifth heat exchange channel 71 and the sixth heat exchange channel 72 can be the inner cavity of the fourth heat exchanger 7, and the other can be a pipe passing through the inner cavity of the fourth heat exchanger 7. In this embodiment, the structure of the fourth heat exchanger 7 can be configured according to actual needs, and will not be described in detail here.

[0079] refer to Figure 1 In some embodiments of this application, the fourth heat exchanger 7 is connected between the third heat exchanger 6 and the first heat exchanger 3.

[0080] Specifically, the inlet of the fifth heat exchange channel 71 is connected to the outlet of the second medium passage 12, and the outlet of the fifth heat exchange channel 71 is connected to the inlet of the second medium passage 12. The third heat medium flowing out of the dryer 1 can flow into the fifth heat exchange channel 71 in the fourth heat exchanger 7, exchange heat with the first heat medium in the sixth heat exchange channel 72 in the fifth heat exchange channel 71, and then flow back into the dryer.

[0081] The inlet of the sixth heat exchange channel 72 is connected to the outlet of the first heat exchanger 3, and the outlet of the sixth heat exchange channel 72 is connected to the inlet of the fourth heat exchange channel 62. The first heat medium flowing out of the dryer 1 can flow into the third heat exchange channel 61 in the third heat exchanger 6, exchange heat with the first heat medium in the fourth heat exchange channel 62 in the third heat exchange channel 61, and then flow into the refrigeration section 52 of the heat pump 5. The first heat medium flowing out of the refrigeration section 52 of the heat pump 5 flows into the first heat exchanger 3 and absorbs heat from the external environment, and then flows into the sixth heat exchange channel 72 of the fourth heat exchanger 7. After absorbing heat from the third heat medium in the sixth heat exchange channel 72, the first heat medium enters the fourth heat exchange channel 62 to continue absorbing heat. After absorbing heat in the fourth heat exchange channel 62, the first heat medium enters the heating section 51 of the heat pump 5 to continue absorbing heat, and then flows into the first heat exchange channel 2a to continue absorbing heat from the heat storage body 21, and finally flows back into the first medium passage 11 of the dryer 1.

[0082] In the above process, the first heat medium flowing out of the first heat exchanger 3 can be gradually heated as it passes through the fourth heat exchanger 7 and the third heat exchanger 6 in sequence, so as to maximize the temperature of the first heat medium flowing into the heating section 51. This can further reduce the amount of heat absorbed by the first heat medium in the heating section 51 to reach the predetermined temperature, and further reduce the energy consumption of the heat pump 5. Similarly, since the heat exchange inside the third heat exchanger 6 and the fourth heat exchanger 7 can occur spontaneously, the reduction in the energy consumption of the heat pump 5 can reduce the energy consumption of the entire sludge drying system.

[0083] For ease of understanding, the operation process of the sludge drying system is fully described in this application embodiment with specific temperature parameters. It should be noted that the temperature parameters described in this application embodiment are only one case and do not represent the temperature parameters in all embodiments.

[0084] In one embodiment, the first heat exchanger 3 is placed in a wastewater 100 environment, the temperature of which is approximately 10 to 12 degrees Celsius. The first heat medium in the first heat exchanger 3, after absorbing heat from the wastewater 100, flows into the sixth heat exchange channel 72 of the fourth heat exchanger 7 to absorb heat from the third heat medium in the fifth heat exchange channel 71. Then, it flows from the fourth heat exchanger 7 into the fourth heat exchange channel 62 of the third heat exchanger 6 and absorbs heat from the first heat medium in the third heat exchange channel 61. After exiting the third heat exchanger 6, the temperature of the first heat medium can reach 11 to 15 degrees Celsius. The first heat medium enters the heating section 51 of the heat pump 5 to continue absorbing heat. After exiting the heat pump 5, the temperature of the first heat medium can reach approximately 55 degrees Celsius. The first heat medium exiting the heat pump 5 enters the first heat exchange channel 2a of the heat storage tank 2 to continue absorbing heat, and then flows into the dryer 1. At this time, the temperature of the first heat medium can reach approximately 90 degrees Celsius. The first and third heat media exchange heat within the dryer 1. After the first heat medium flows out of the dryer 1, its temperature drops below 45 degrees Celsius. The first heat medium flowing out of the dryer 1 flows into the third heat exchange channel 61 of the third heat exchanger 6 to continue absorbing heat, and then flows into the refrigeration section 52 of the heat pump 5 to continue dissipating heat. After flowing out of the refrigeration section 52 of the heat pump 5, the temperature of the first heat medium drops to about 8 degrees Celsius, and then flows back into the first heat exchanger 3 to exchange heat with the wastewater 100.

[0085] The third heat medium inside the dryer 1 absorbs heat from the first heat medium and then dries the sludge inside the dryer 1. After flowing out of the dryer 1, the temperature of the third heat medium drops to 30 to 40 degrees Celsius. The third heat medium flows into the fifth heat exchange channel 71 of the fourth heat exchanger 7, absorbs heat, flows out of the fifth heat exchange channel 71, and flows back into the dryer 1.

[0086] refer to Figure 2 In some embodiments of this application, the heat storage body 21 has flow through holes 211, and the aforementioned first heat exchange channel 2a is the cavity of the flow through holes 211. When the first heat medium flows through the flow through holes 211, it can directly exchange heat with the heat storage body 21. This can improve the heat exchange efficiency between the heat storage body 21 and the first heat medium, thus helping to improve the drying efficiency of sludge drying. The shape of the flow through holes 211 can be a rectangular hole, a circular hole, or even an irregularly shaped hole. The extension direction of the flow through holes 211 can be set according to actual needs. Specifically, the extension direction of the flow through holes 211 can be arranged in a straight line or in a serpentine curve.

[0087] refer to Figure 4In some embodiments of this application, the flow passage 211 may not be required on the heat storage body 21. Correspondingly, the heat storage device 2 includes a first heat transfer tube 23, and the aforementioned first heat exchange channel 2a is the cavity of the first heat transfer tube 23. The first heat transfer tube 23 contacts the heat storage body 21 so that the first heat medium within the first heat transfer tube 23 can fully absorb the heat from the heat storage body 21. In embodiments of this application, the first heat transfer tube 23 is preferably a serpentine tube to increase the contact area between the first heat transfer tube 23 and the heat storage body 21. The first heat transfer tube 23 can be made of thermally conductive materials such as copper, aluminum, graphite, or thermally conductive plastics to improve the thermal conductivity of the heat transfer path between the first heat medium and the heat storage body 21, thereby improving the heat conduction efficiency between the first heat medium and the heat storage body 21. The first heat transfer tube 23 can be fixed to the surface of the heat storage unit 2 by adhesive bonding; or the heat storage body 21 can also be provided with holes or grooves for mounting the first heat transfer tube 23 so that the first heat transfer tube 23 can be fixed to the heat storage body 21 by mounting.

[0088] refer to Figure 2 , Figure 4 In some embodiments of this application, the heat storage device 2 includes a second heat transfer tube 24. The aforementioned second heat exchange channel 2b is the cavity of the second heat transfer tube 24. The second heat transfer tube 24 is in contact with the cooling end 22a of the semiconductor thermoelectric structure 22, so that the cooling end 22a can fully absorb the heat of the second heat medium in the second heat transfer tube 24. In the embodiments of this application, the second heat transfer tube 24 is preferably a serpentine tube to increase the contact area between the second heat transfer tube 24 and the cooling end 22a. The second heat transfer tube 24 can be made of thermally conductive materials such as copper, aluminum, graphite, and thermally conductive plastics to improve the thermal conductivity of the heat transfer path between the second heat medium and the cooling end 22a, thereby improving the heat conduction efficiency between the second heat medium and the cooling end 22a. The second heat transfer tube 24 can be bonded to the semiconductor thermoelectric structure 22 with thermally conductive adhesive; or the semiconductor thermoelectric structure 22 can also be provided with holes or slots for mounting the second heat transfer tube 24, so that the second heat transfer tube 24 is fixed to the semiconductor thermoelectric structure 22 by a snap-fit ​​method.

[0089] refer to Figure 2 , Figure 4In some embodiments of this application, a heat-conducting structure 25 is provided between the heat storage body 21 and the heating end 22b of the semiconductor thermoelectric structure 22. Specifically, the heat-conducting structure 25 can be a heat-conducting pad, a heat-conducting pipe, a heat-conducting strip, or the like. For example, the heat-conducting structure 25 can be a heat-conducting pad made of heat-conducting materials such as copper, aluminum, graphite, or thermally conductive plastic. The heat-conducting pad is laid between the heat storage body 21 and the semiconductor thermoelectric structure 22, with both sides of the heat-conducting pad in contact with the heat storage body 21 and the heating end 22b of the semiconductor thermoelectric structure 22, respectively, to reduce the heat transfer coefficient between the heat storage body 21 and the heating end 22b, so that the heat from the heating end 22b can be quickly transferred to the heat storage body 21. The heat-conducting structure 25 can also be a heat-conducting pipe made of heat-conducting materials such as copper, aluminum, graphite, or thermally conductive plastic. The two sides of the heat pipe are in contact with the heat storage body 21 and the heating end 22b of the semiconductor thermoelectric structure 22, respectively. The heat pipe contains a heat-conducting medium such as water or liquid metal to improve the thermal conductivity of the heat transfer path between the heat storage body 21 and the heating end 22b, so that the heat from the heating end 22b can be quickly transferred to the heat storage body 21. A serpentine tube can be used for the heat pipe to increase the contact area between the heat pipe and the heat storage body 21 and the semiconductor thermoelectric structure 22, thereby improving the heat conduction efficiency of the heat storage body 21 and the semiconductor thermoelectric structure 22.

[0090] refer to Figure 2 , Figure 4 In some embodiments of this application, the heat storage device 2 includes an insulation shell 26. The insulation shell 26 is an outer shell structure made of insulation materials such as rock wool, glass wool, and polystyrene foam. The insulation shell 26 has an internal insulation cavity 261, and the heat storage body 21, the semiconductor thermoelectric structure 22, and other structures are all located inside the insulation shell 26. The insulation shell 26 ensures that the heat from the heat storage body 21 and the semiconductor thermoelectric structure 22 is not easily radiated into the atmosphere, thereby reducing the heat loss of the heat storage device 2.

[0091] In this embodiment, the heat-insulating shell 26 is specifically a cubic frame structure, which also has a cubic heat-insulating inner cavity 261 inside. The semiconductor thermoelectric structure 22 is specifically a rectangular sheet structure and is nested inside the heat-insulating shell 26. A rectangular through hole is opened on the semiconductor thermoelectric structure 22, and the heat storage body 21 is embedded in the rectangular through hole of the semiconductor thermoelectric structure 22. The part of the semiconductor thermoelectric structure 22 near the heat storage body 21 is the heating end 22b, and the part away from the heat storage body 21 is the cooling end 22a. A flow through hole 211 for the flow of the first heat medium is opened on the heat storage body 21, or a first heat transfer pipe 23 for the flow of the first heat medium is attached to the surface of the heat storage body 21. A heat-conducting structure 25 is provided between the heat storage body 21 and the heating end 22b of the semiconductor thermoelectric structure 22. The heat-conducting structure 25 is preferably a serpentine tube, and the inside of the serpentine tube is filled with a heat-conducting medium such as water. A second heat transfer tube 24 is disposed between the cooling end 22a of the semiconductor thermoelectric structure 22 and the insulation shell 26. The second heat transfer tube 24 is also a serpentine tube, and a second heat transfer medium flows inside it. The insulation shell 26 and the semiconductor thermoelectric structure 22, and the semiconductor thermoelectric structure 22 and the heat storage body 21 can be fixed by means of thermally conductive adhesive or by means of interference fit. The first heat transfer tube 23 can be fixedly clamped between the heat storage body 21 and the semiconductor thermoelectric structure 22, or it can be bonded between the heat storage body 21 and the semiconductor thermoelectric structure 22 by thermally conductive adhesive. The second heat transfer tube 24 can be fixedly clamped between the insulation shell 26 and the semiconductor thermoelectric structure 22, or it can be bonded between the insulation shell 26 and the semiconductor thermoelectric structure 22 by thermally conductive adhesive.

[0092] refer to Figure 1 In some embodiments of this application, the fourth heat exchanger 7 has a condensation outlet 73. The condensation outlet 73 is connected to the fifth heat exchange channel 71. When the third heat medium is gas, the low-temperature, low-humidity gas, after flowing into the dryer 1, absorbs the temperature of the first heat medium and the moisture separated from the sludge, thus becoming a high-temperature, high-humidity gas. After the high-temperature, high-humidity gas flows into the fifth heat exchange channel 71 for heat exchange, it exchanges heat with the first heat medium in the sixth heat exchange channel 72. At this time, the heat of the third heat medium is transferred to the first heat medium, the temperature of the third heat medium drops, and the moisture in the third heat medium condenses in the fifth heat exchange channel 71. The condensation outlet 73 is connected to the fifth heat exchange channel 71, which facilitates the timely discharge of condensate in the fifth heat exchange channel 71. This helps to reduce the moisture content of the third heat medium flowing back into the second medium passage 12 from the fifth heat exchange channel 71, thus improving the drying efficiency of the sludge dried by the third heat medium.

[0093] In practical implementation, the condensate outlet 73 can be arranged on the ground-facing side of the fifth heat exchange channel 71 so that the condensate in the fifth heat exchange channel 71 can flow out from the condensate outlet 73 under the action of gravity. Quicklime or other water-absorbing agents, or sponge strips or other water-absorbing structures, can also be installed inside the condensate outlet 73 to improve the efficiency of condensate drainage. The discharged condensate can be used as the first heat medium to supplement the first heat exchanger 3, or it can be purified and used for other purposes to improve the utilization rate of water resources.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0095] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or at least two of the features. In the description of this utility model, unless otherwise stated, "at least two" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0096] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0097] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0098] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or at least two embodiments or examples.

[0099] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A sludge drying system, characterized in that, include: Dryer (1), the dryer (1) is used to dry sludge; the dryer (1) includes a first medium passage (11), the first medium passage (11) is used to flow a first heat medium; A heat storage device (2) includes a heat storage body (21), a semiconductor thermoelectric structure (22), a first heat exchange channel (2a), and a second heat exchange channel (2b). The heat storage body (21) is used to store heat. The semiconductor thermoelectric structure (22) has a cooling end (22a) and a heating end (22b). When the semiconductor thermoelectric structure (22) is energized, the cooling end (22a) absorbs heat from the second heat exchange channel (2b), and the heat generated by the heating end (22b) is transferred to the heat storage body (21). The output port of the first heat exchange channel (2a) is connected to the input port of the first medium passage (11). When the first heat medium is introduced into the first heat exchange channel (2a), the heat of the heat storage body (21) is transferred to the first heat medium. The second heat exchange channel (2b) is used to circulate a second heat medium. The first heat exchanger (3) has its inlet connected to the outlet of the first medium passage (11) and its outlet connected to the inlet of the first heat exchange channel (2a). When the first heat exchanger (3) is supplied with the first heat medium, the heat from the external environment is transferred to the first heat medium. Second heat exchanger (4); the inlet of the second heat exchanger (4) is connected to the outlet of the second heat exchange channel (2b), and the outlet of the second heat exchanger (4) is connected to the inlet of the second heat exchange channel (2b); when the second heat medium is introduced into the second heat exchanger (4), the heat of the external environment is transferred to the second heat medium.

2. The sludge dewatering system of claim 1, wherein, The sludge drying system also includes a heat pump (5); The heat pump (5) has a heating section (51) and a cooling section (52); the inlet of the heating section (51) is connected to the outlet of the first heat exchanger (3), and the outlet of the heating section (51) is connected to the inlet of the first heat exchange channel (2a); the inlet of the cooling section (52) is connected to the outlet of the first medium passage (11), and the outlet of the cooling section (52) is connected to the inlet of the first heat exchanger (3).

3. The sludge dewatering system of claim 2, wherein, The sludge drying system also includes a third heat exchanger (6); The third heat exchanger (6) includes a third heat exchange channel (61) and a fourth heat exchange channel (62); the inlet of the third heat exchange channel (61) is connected to the outlet of the first medium passage (11), and the outlet of the third heat exchange channel (61) is connected to the inlet of the first heat exchanger (3); The inlet of the fourth heat exchange channel (62) is connected to the outlet of the first heat exchanger (3), and the outlet of the fourth heat exchange channel (62) is connected to the inlet of the first heat exchange channel (2a). When the first heat medium is introduced into the third heat exchange channel (61) and the fourth heat exchange channel (62), the heat of the first heat medium in the third heat exchange channel (61) is transferred to the first heat medium in the fourth heat exchange channel (62).

4. The sludge dewatering system of claim 3, wherein, The third heat exchanger (6) is connected between the heat pump (5) and the first heat exchanger (3); the output port of the third heat exchange channel (61) is connected to the input port of the refrigeration unit (52); the output port of the fourth heat exchange channel (62) is connected to the input port of the heating unit (51).

5. The sludge dewatering system of claim 3, wherein, The dryer (1) further includes a second medium passage (12) for circulating a third heat medium for drying sludge; When the first heat medium is introduced into the first medium passage (11) and the third heat medium is introduced into the second medium passage (12), the heat of the first heat medium is transferred to the third heat medium.

6. The sludge dewatering system of claim 5, wherein, The sludge drying system also includes a fourth heat exchanger (7); The fourth heat exchanger (7) includes a fifth heat exchange channel (71) and a sixth heat exchange channel (72); the inlet of the fifth heat exchange channel (71) is connected to the outlet of the second medium passage (12), and the outlet of the fifth heat exchange channel (71) is connected to the inlet of the second medium passage (12); The inlet of the sixth heat exchange channel (72) is connected to the outlet of the first heat exchanger (3), and the outlet of the sixth heat exchange channel (72) is connected to the inlet of the first heat exchange channel (2a). When the third heat medium is introduced into the fifth heat exchange channel (71) and the first heat medium is introduced into the sixth heat exchange channel (72), the heat of the third heat medium in the fifth heat exchange channel (71) is transferred to the first heat medium in the sixth heat exchange channel (72).

7. The sludge dewatering system of claim 6, wherein, The fourth heat exchanger (7) is connected between the third heat exchanger (6) and the first heat exchanger (3); the output port of the sixth heat exchange channel (72) is connected to the input port of the fourth heat exchange channel (62).

8. The sludge dewatering system according to any one of claims 1-7, characterized in that, The heat storage body (21) has a flow through hole (211), and the first heat exchange channel (2a) is the cavity of the flow through hole (211).

9. The sludge dewatering system according to any one of claims 1-7, characterized in that, The heat storage device (2) includes a first heat transfer tube (23), and the first heat exchange channel (2a) is the cavity of the first heat transfer tube (23); the first heat transfer tube (23) is in contact with the heat storage body (21).

10. The sludge drying system according to any one of claims 1-7, characterized in that, The heat storage device (2) includes a second heat transfer tube (24), and the second heat exchange channel (2b) is the cavity of the second heat transfer tube (24); the second heat transfer tube (24) is in contact with the cooling end (22a) of the semiconductor thermoelectric structure (22).

11. The sludge dewatering system of any one of claims 1-7, wherein, A heat-conducting structure (25) is provided between the heat storage body (21) and the heating end (22b) of the semiconductor thermoelectric structure (22); the heat-conducting structure (25) is in contact with both the heat storage body (21) and the heating end (22b) of the semiconductor thermoelectric structure (22).

12. The sludge dewatering system of any one of claims 1-7, wherein, The heat storage device (2) includes an insulation shell (26); The heat preservation shell (26) has a heat preservation inner cavity (261), and the heat accumulator (21) and the semiconductor thermoelectric structure (22) are located in the heat preservation inner cavity (261).

13. The sludge dewatering system of claim 6, wherein, The fourth heat exchanger (7) has a condensing outlet (73) in communication with the fifth heat exchange channel (71).

Images