Sludge drying system

Abstract

Sludge drying system, characterized in that it comprises: a dryer (1) usable for drying the sludge, the dryer (1) comprising a first media path (11) usable for circulating a first heat medium; a heat storage device (2) comprising a heat storage body (21), a thermoelectric semiconductor structure (22), a first heat exchange channel (2a), and a second heat exchange channel (2b), wherein the heat storage body (21) can be used to store heat, wherein the thermoelectric semiconductor structure (22) has a cooling end (22a) and a heating end (22b), wherein, when the thermoelectric semiconductor structure (22) is switched on, the cooling end (22a) absorbs the heat in the second heat exchange channel (2b), wherein the heat generated by the heating end (22b) can be transferred to the heat storage body (21), wherein the output connection of the first heat exchange channel (2a) is connected to the input connection of the first media path (11), wherein, when the first heat medium is supplied to the first heat exchange channel (2a), the heat of the heat storage body (21) can be transferred to the first heat medium,and wherein the second heat exchange channel (2b) is usable for circulating a second heat medium; , a first heat exchanger (3), wherein the inlet connection of the first heat exchanger (3) is connected to the outlet connection of the first media path (11), wherein the outlet connection of the first heat exchanger (3) is connected to the inlet connection of the first heat exchange channel (2a), and wherein, when the first heat medium is supplied to the first heat exchanger (3), the heat of the external environment can be transferred to the first heat medium; a second heat exchanger (4), wherein the inlet port of the second heat exchanger (4) is connected to the outlet port of the second heat exchange channel (2b), wherein the outlet port of the second heat exchanger (4) is connected to the inlet port of the second heat exchange channel (2b), and wherein, when the second heat medium is supplied to the second heat exchanger (4), the heat of the external environment can be transferred to the second heat medium.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge drying, in particular to a sludge drying system. STATE OF THE ART

[0002] Sludge drying is a process for reducing the water content of sludge through physical or chemical means. It aims to reduce the volume of the sludge. This facilitates sludge transportation and subsequent treatment such as sludge incineration, sludge landfilling, or sludge resource utilization.

[0003] The main technologies for sludge drying are thermal drying, mechanical dewatering, and natural drying. Thermal drying technology can significantly reduce the water content of sludge by evaporating water using an external heat source. Thermal drying technology has high thermal efficiency but also involves high energy consumption. At the same time, the cost of thermal drying technology is high, the economics are low, and there is more scope for optimizing energy efficiency. CONTENT OF THE PRESENT INVENTION

[0004] To solve the above-described problems, an embodiment of the present application provides a sludge drying system.

[0005] The sludge drying system described in an embodiment of the present application comprises: a dryer usable or used for drying the sludge; wherein the dryer comprises a first media path usable or used for circulating a first heat medium; a heat storage device comprising a heat storage body, a thermoelectric semiconductor structure, a first heat exchange channel, and a second heat exchange channel; wherein the heat storage body is usable or is used for storing the heat; and wherein the thermoelectric semiconductor structure has a cooling end and a heating end; wherein, when the thermoelectric semiconductor structure is switched on, the cooling end absorbs or can absorb the heat in the second heat exchange channel, and wherein the heat generated by the heating end is transferable or is transferred to the heat storage body; and wherein the output port of the first heat exchange channel is connected to the input port of the first medium path, and wherein, when the first heat medium is supplied to the first heat exchange channel, the heat of the heat storage body is transferable or can be transferred to the first heat medium.is transferred; and wherein the second heat exchange channel is usable or used for circulating a second heat medium;. a first heat exchanger, wherein the inlet port of the first heat exchanger is connected to the outlet port of the first media path, and wherein the outlet port of the first heat exchanger is connected to the inlet port of the first heat exchange channel; and wherein, when the first heat medium is supplied to the first heat exchanger, the heat of the external environment is transferable or is transferred to the first heat medium; a second heat exchanger, wherein the inlet port of the second heat exchanger is connected to the outlet port of the second heat exchange channel, and wherein the outlet port of the second heat exchanger is connected to the inlet port of the second heat exchange channel; and wherein, when the second heat medium is supplied to the second heat exchanger, the heat of the external environment is transferable or transferred to the second heat medium.

[0006] Optionally, the sludge drying system also includes a heat pump; wherein the heat pump has a heating part and a cooling part; and wherein the inlet port of the heating part is connected to the outlet port of the first heat exchanger, and wherein the outlet port of the heating part is connected to the inlet port of the first heat exchange channel; and wherein the inlet port of the cooling part is connected to the outlet port of the first media path, and wherein the outlet port of the cooling part is connected to the inlet port of the first heat exchanger.

[0007] Optionally, the sludge drying system also includes a third heat exchanger; wherein the third heat exchanger comprises a third heat exchange channel and a fourth heat exchange channel; and wherein the inlet port of the third heat exchange channel is connected to the outlet port of the first media path, and wherein the outlet port of the third heat exchange channel is connected to the inlet port of the first heat exchanger; and wherein the inlet port of the fourth heat exchange channel is connected to the outlet port of the first heat exchanger, and wherein the outlet port of the fourth heat exchange channel is connected to the inlet port of the first heat exchange channel; and wherein, when the first heat medium is supplied to 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 transferable or transferred to the first heat medium in the fourth heat exchange channel.

[0008] Optionally, the third heat exchanger is connected between the heat pump and the first heat exchanger; and wherein the output port of the third heat exchange channel is connected to the input port of the cooling part; and wherein the output port of the fourth heat exchange channel is connected to the input port of the heating part.

[0009] Optionally, the dryer further comprises a second media path usable or used for circulating a third heat medium usable or used for drying the sludge; wherein, when the first heat medium is / is supplied to the first media path and the third heat medium is / is supplied to the second media path, the heat of the first heat medium is / is transferable to the third heat medium.

[0010] Optionally, the sludge drying system further comprises a fourth heat exchanger; wherein the fourth heat exchanger comprises a fifth heat exchange channel and a sixth heat exchange channel; and wherein the inlet port of the fifth heat exchange channel is connected to the outlet port of the second media path, and wherein the outlet port of the fifth heat exchange channel is connected to the inlet port of the second media path; and wherein the inlet port of the sixth heat exchange channel is connected to the outlet port of the first heat exchanger, and wherein the outlet port of the sixth heat exchange channel is connected to the inlet port of the first heat exchange channel; and wherein, when the first heat medium is supplied to the fifth heat exchange channel and the first heat medium is supplied to the sixth heat exchange channel, the heat of the third heat medium in the fifth heat exchange channel is transferable or is transferred to the first heat medium in the sixth heat exchange channel.

[0011] Optionally, the fourth heat exchanger is connected between the third heat exchanger and the first heat exchanger; wherein the output port of the sixth heat exchange channel is connected to the input port of the fourth heat exchange channel.

[0012] Optionally, the heat storage body is provided with a flow passage hole, wherein the first heat exchange channel is a hole cavity of the flow passage hole.

[0013] Optionally, the heat storage device comprises a first heat transfer tube, wherein the first heat exchange channel is the tube cavity of the first heat transfer tube; and wherein the first heat transfer tube is in contact with the heat storage body.

[0014] Optionally, the heat storage device comprises a second heat transfer tube, wherein the second heat exchange channel is the tube cavity of the second heat transfer tube; and wherein the second heat transfer tube is in contact with the cooling end of the thermoelectric semiconductor structure.

[0015] Optionally, a heat-conducting structure is arranged between the heat storage body and the heating end of the thermoelectric semiconductor structure; wherein the heat-conducting structure is simultaneously in contact with the heat storage body and the heating end of the thermoelectric semiconductor structure.

[0016] Optionally, the heat storage unit includes a heat insulation shell; wherein the heat insulating shell has a heat insulating inner cavity therein, wherein the heat storage body and the thermoelectric semiconductor structure are each located within the heat insulating inner cavity.

[0017] Optionally, the fourth heat exchanger has a condensation outlet connected to the fifth heat exchange channel.

[0018] In the sludge drying system according to the embodiment of the present application, the heat storage body can use a thermoelectric semiconductor structure to extract heat from a second heat medium. This can improve the heat storage efficiency of the heat storage compared to a conventional solid-state heat storage device, and also contributes to improving the energy density of the heat storage device and reducing the space occupied by the heat storage device. The thermoelectric semiconductor structure can utilize low-load electricity or green electricity to generate heat. After heat absorption, the heat storage device can release the heat during high-load hours to reduce energy costs and realize peak and valley arbitrage.The first heat exchanger can be configured to absorb heat from the outside environment to heat the first heat medium, and the second heat exchanger can be configured to absorb heat from the outside environment to heat the second heat medium. This facilitates the utilization of waste heat from the outside environment and thus improves energy efficiency.

[0019] The additional aspects and advantages of the present application will be set forth in part in the description which follows, and some will be obvious from the description which follows, or may be learned by practice of the present application. SHORT DESCRIPTION OF THE DRAWING

[0020] The above and / or additional aspects and advantages of the present application will be apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings. Fig. 1 shows a structural view of a sludge drying system according to the present application; Fig. Figure 2 shows a schematic diagram of the structure of a heat storage device according to Fig. 1; Fig. Figure 3 shows a schematic diagram of the connection of a heat pump with a first heat exchanger, a third heat exchanger, a fourth heat exchanger and a heat accumulator according to Fig. 1; Fig. Fig. 4 shows a schematic diagram of the structure of another embodiment according to Fig. 2. List of reference symbols 1 dryer 11 First media route 12 Second media route 2 heat storage tanks 2a First heat exchange channel 2b Second heat exchange channel 21 heat storage bodies 211 Flow passage hole 22 Thermoelectric semiconductor structure 22a Cooling 22b Heating 23 First heat transfer tube 24 Second heat transfer tube 25 Heat-conducting structure 26 Thermal insulation shell 261 Heat-retaining inner cavity 3 First heat exchanger 4 Second heat exchanger 5 heat pump 51 Heating part 52 refrigerator compartment 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 Condensation outlet 8 Control valve 100 Wastewater DETAILED DESCRIPTION

[0021] The exemplary embodiments of this application are described in detail below, wherein the examples are illustrated in the drawings and identical or similar reference numerals designate identical or similar elements or elements with identical or similar functions. The exemplary embodiments described below with reference to the accompanying drawings are exemplary and serve merely to explain this application and are not to be understood as limiting this application. All other exemplary embodiments that a person skilled in the art obtains on the basis of the exemplary embodiments of this application without creative work fall within the scope of this application.

[0022] Sludge drying is a process for reducing the water content of sludge through physical or chemical means. It aims to reduce the volume of the sludge. This facilitates sludge transportation and subsequent treatment such as sludge incineration, sludge landfilling, or sludge resource utilization.

[0023] The main technologies for sludge drying are thermal drying, mechanical dewatering, and natural drying. Mechanical dewatering uses centrifuges, filter presses, and other equipment to physically separate the solid and liquid components of the sludge, thereby achieving the goal of sludge drying. This consumes a lot of energy, and the sludge drying cycle is long. At the same time, it is difficult to achieve the desired sludge drying effect with a mechanical dewatering method because the sludge still has a high water content after drying.

[0024] Natural drying involves harnessing natural solar and wind energy to evaporate the water in sludge. The equipment used for natural drying is simple in design, has low energy costs, is easy to maintain, and simple to operate.

[0025] However, natural drying takes a very long time and is easily affected by climate. Natural drying equipment also requires a large footprint, which typically results in high site costs.

[0026] Compared with the previous two sludge drying technologies, thermal drying has a greater advantage in terms of drying efficiency. Thermal drying technology generally uses an external heat source to evaporate the water in the sludge, so that sludge with a moisture content of 80% can be dried into a dry sludge with a moisture content of 10%-40%. Existing thermal drying technology can be divided into two types: one is direct thermal drying technology, which uses hot air to directly contact the sludge to dry it. Direct thermal drying technology often uses rotary kilns, belt dryers, and other equipment. The drying efficiency is high, but it is easy to generate exhaust gases, dust, and other pollution.Indirect thermal drying technology heats the sludge via a heat exchanger, produces no exhaust gases, and has a thermal efficiency of 60-80%. Indirect thermal drying technology typically uses thin-film dryers, paddle dryers, etc.

[0027] Both direct thermal drying and indirect thermal drying require relatively high heat energy. This means that the energy consumption of thermal drying technologies is generally higher, leaving more room for energy efficiency optimization. At the same time, the equipment costs for thermal sludge drying technology are high, so the economics of thermal sludge drying technology are relatively low.

[0028] Against this background, the present application provides a sludge drying system to overcome the many problems in the prior art.

[0029] With reference to Fig. 1, the sludge drying system in the exemplary embodiment of the present application comprises a dryer 1, a heat accumulator 2, a first heat exchanger 3, and a second heat exchanger 4. The dryer 1 is a device for drying sludge and has a first media path 11 inside. During the sludge drying process, a first heat medium can be supplied to the first media path 11. The first heat medium can supply heat to the dryer 1. In the exemplary embodiment of the present application, the dryer 1 can be a rotary kiln, a belt dryer, a thin-film dryer, a paddle dryer, etc. In other words, the first heat medium can be a gas or a liquid. When a gas is used as the first heat medium, air is preferably used to reduce the cost of using the sludge drying system. Of course, the first heat medium can also be a gas such as nitrogen, carbon dioxide, etc.If the first heat medium is a liquid, water is preferred, which can also reduce the operating costs of the sludge drying system. Of course, the first heat medium can also be a liquid such as mineral oil, ethylene glycol, etc.

[0030] If the first heat medium is a gas, the first medium path 11 is a chamber in the dryer 1 for the flow of the gas and the inflation of the sludge. As the first heat medium flows through the first medium path 11, it exchanges heat with the sludge and carries the moisture evaporated by the heat of the sludge out of the dryer 1. If the first heat medium is a liquid, the first medium path 11 may be the piping of the heat exchanger inside the dryer 1. As the first heat medium flows through the first medium path 11, it can directly exchange heat with the sludge to evaporate the moisture in the sludge. Alternatively, as it flows through the first medium path 11, the first heat medium may undergo heat exchange with the gas in the dryer 1 to make the gas in the dryer 1 a high-temperature gas that can be used to dry the sludge.

[0031] With reference to Fig. 2, the heat accumulator 2 is a device for storing heat. In the exemplary embodiment of the present application, the heat accumulator 2 comprises a heat storage body 21, a thermoelectric semiconductor structure 22, a first heat exchange channel 2a, and a second heat exchange channel 2b.

[0032] The heat storage body 21 can generally be made of a phase-change material or a solid-state heat storage material. For example, the heat storage body 21 can be an airtight container containing a phase-change material such as molten salt, hydrated salt, paraffin, etc. The heat storage body 21 can absorb the heat, causing the phase-change material inside to undergo a phase change and store the heat. Alternatively, the heat storage body 21 can be a solid structure made of a solid heat storage material such as ceramic, cast iron, etc. The heat storage body 21 can absorb heat from adjacent structures and store the heat within itself.

[0033] The thermoelectric semiconductor structure 22 is a physical structure made of a thermoelectric semiconductor material and has a cooling end 22a and a heating end 22b. In particular, the thermoelectric semiconductor structure 22 is a structure made of two semiconductor materials, an N-type and a P-type, which utilizes the Peltier effect. When a direct current is applied to the thermoelectric semiconductor structure 22, charge carriers (electrons or holes) are driven across the junction by an electric field as the direct current flows through the junction formed by the N-type semiconductor material and the P-type semiconductor material. As 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.The flow of holes from the P-type semiconductor to the N-type semiconductor corresponds to the reverse flow of electrons, which is also accompanied by heat dissipation. At this time, a portion of the thermoelectric semiconductor structure 22 absorbs the heat, representing the cooling end 22a of the thermoelectric semiconductor structure 22, and a portion of the thermoelectric semiconductor structure 22 releases the heat, representing the heating end 22b of the thermoelectric semiconductor structure 22.

[0034] With reference to Fig. 1, the first heat exchange channel 2a is a structure connected to the first medium path 11, and the first heat medium can flow into the first medium path 11 through the first heat exchange channel 2a. The first heat exchange channel 2a can be a cavity in the heat storage body 21, a pipe passing through the heat storage body 21, or a pipe adhering to the surface of the heat storage body 21. The first heat medium can simultaneously perform heat exchange with the heat storage body 21 as it flows through the first heat exchange channel 2a. At this time, the heat inside the heat storage body 21 is transferred to the first heat medium and enters the dryer 1 with the first heat medium.

[0035] With reference to Fig. 1, the second heat exchange channel 2b is a structure in which the second heat medium flows. The first heat medium and the second heat medium may be made of the same material or different materials. Preferably, in the embodiment of the present application, both the first and second heat media are water. The second heat exchange channel 2b may be a cavity at the cooling end 22a of the thermoelectric semiconductor structure 22, a pipe passing through the cooling end 22a of the thermoelectric semiconductor structure 22, or a pipe adhering to the surface of the cooling end 22a of the thermoelectric semiconductor structure 22. The second heat medium may synchronously feed the direct current into the thermoelectric semiconductor structure 22 as it flows through the second heat exchange channel 2b.At this time, the temperature of the second heat medium is transferred to the heating end 22b via the cooling end 22a under the cooling effect of the cooling end 22a. The heat storage body 21 and the heating end 22b of the thermoelectric semiconductor structure 22 may be connected to each other in direct contact or indirectly via other structures, so that the heat generated by the heating end 22b can be transferred to the heat storage body 21 and stored therein.

[0036] With reference to Fig. 1, the first heat exchanger 3 is a structure for exchanging heat with the external environment, with a first heat medium circulating inside. In the embodiment of the present application, the external environment may be an atmospheric environment or a liquid water environment. Preferably, in the embodiment of the present application, the external environment is an environment of the wastewater 100. That is, in operation, the wastewater 100 is introduced into the first heat exchanger 3, and the piping in the first heat exchanger 3 in which the first heat medium circulates can exchange heat with the wastewater 100 to absorb the heat of the wastewater 100. The inlet port of the first heat exchanger 3 is connected to the outlet port of the first medium path 11, and the outlet port of the first heat exchanger 3 is connected to the inlet port of the first heat exchange channel 2a.In other words, the first heat medium entering the first heat exchanger 3 is a low- or medium-temperature medium after releasing heat in the dryer 1. The first heat medium in the first heat exchanger 3, after flowing out, enters the first heat exchange channel 2a to further absorb the heat stored in the heat storage body 21 and finally flows back into the first medium path 11 of the dryer 1.

[0037] With reference to Fig. 1, the second heat exchanger 4 is also a structure for exchanging heat with the external environment, with a second heat medium circulating inside. In the embodiment of the present application, the second heat exchanger 4 and the first heat exchanger 3 can be located in the same external environment or in different external environments. Preferably, in the embodiment of the present application, both the first heat exchanger 3 and the second heat exchanger 4 are located in the environment of the wastewater 100. That is, in operation, the wastewater 100 is introduced into the second heat exchanger 4, and the piping in the second heat exchanger 4 in which the second heat medium circulates can exchange heat with the wastewater 100 to absorb the heat of the wastewater 100.The inlet port of the second heat exchanger 4 is connected to the outlet port of the second heat exchange channel 2b, and the outlet port of the second heat exchanger 4 is connected to the inlet port of the second heat exchange channel 2b. When the direct current is supplied to the thermoelectric semiconductor structure 22, the heat of the second heat medium in the second heat exchange channel 2b is absorbed or absorbed by the cooling end 22a of the thermoelectric semiconductor structure 22. After cooling, the second heat medium flows into the second heat exchanger 4 through the cooling end 22a and continues to exchange heat with the wastewater 100 in the second heat exchanger 4. After absorbing the heat from the wastewater 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 thermoelectric semiconductor structure 22.

[0038] The wastewater 100 in the embodiment of the present application may be a waste resource such as industrial wastewater, domestic wastewater 100, etc. This allows the thermal resources in the wastewater 100 to be reused, which in turn improves the energy utilization rate.

[0039] In practice, the sludge drying system in the embodiment of the present application can supply power to the thermoelectric semiconductor structure 22 or feed green electricity into the thermoelectric semiconductor structure 22 during low-load hours. At this time, the thermoelectric semiconductor structure 22 can continuously absorb heat from the wastewater 100 under the effect of the transfer of the second heat exchanger 4 and the second heat medium and store the heat in the heat storage body 21 of the heat storage device 2. By using the thermoelectric semiconductor structure 22, the space occupied by the heat storage device 2 is significantly reduced compared to integrating a structure such as a heat pump 5 into the heat storage device 2 to absorb heat from the wastewater 100. This contributes to reducing the space and material costs of the heat storage device 2.At the same time, the use of the thermoelectric semiconductor structure 22 allows more heat to be supplied to the heat storage body 21 than with conventional heat storage devices 2, which rely solely on heat transfer for heat storage. This contributes to increasing the amount of heat stored in the heat storage device 2 and thus increasing the energy density of the heat storage device 2. While the heat storage device 2 stores the heat, the first heat exchanger 3 can continuously allow the first heat medium to exchange heat with the wastewater 100. The first heat medium flows through the heat storage device 2 and heats up, then flows into the dryer 1 to ensure a continuous flow of high-temperature first heat medium into the dryer 1.

[0040] During high-load hours, the thermoelectric semiconductor structure 22 can be switched off. A control valve 8 can be arranged between the inlet port of the second heat exchanger 4 and the outlet port of the second heat exchange channel 2b, or between the outlet port of the second heat exchanger 4 and the inlet port of the second heat exchange channel 2b. The control valve is switched off synchronously to stop the circulation of the second heat medium. At this time, the heat stored in the heat storage body 21 can continue to be released to the outside and synchronously heat the first heat medium flowing through the heat storage body 21. This ensures that the first heat medium continuously flows into the dryer 1 at a high temperature, even during high-load hours.In other words, the sludge drying system in the present application can provide a structural basis for peak and valley arbitrage. Using the sludge drying system in the present application, it is possible to realize peak and valley arbitrage operation, in which heat is stored in the heat storage 2 during low-load hours and released from the heat storage 2 during high-load hours, provided that a continuous flow of the first high-temperature heat medium into the dryer 1 is ensured, thereby significantly improving the profitability and economy of the sludge drying system.

[0041] In some embodiments of the present application, the sludge drying system further includes a heat pump 5. The heat pump 5 is a device that transfers heat from a low-temperature heat source to a high-temperature environment by supplying a small amount of electrical or mechanical energy. The heat pump 5 does not generate direct heat during the heat transfer process. The existing heat pump 5 typically uses a phase change cycle of a refrigerant to achieve heat transfer and specifically includes four structures, such as an evaporator, a compressor 53, a condenser, and an expansion valve 54. The evaporator is the cooling part 52 of the heat pump 5, and the condenser is the heating part 51 of the heat pump 5.The input port of the heating part 51 is connected to the output port of the first heat exchanger 3, and the output port of the heating part 51 is connected to the input port of the first heat exchange channel 2a; the input port of the cooling part 52 is connected to the output port of the first media path 11, and the output port of the cooling part 52 is connected to the input port of the first heat exchanger 3.

[0042] With reference to Fig. 3, the evaporator, the compressor 53, the condenser, and the expansion valve 54 are connected by another set of separate working medium paths. A liquid working medium at ambient temperature and low pressure, such as Freon, typically circulates in the working medium path. When the sludge drying system in the embodiment of the present application is in operation, the first heat medium flows from the first media path 11 of the dryer 1 into the evaporator of the heat pump 5. The liquid working medium at ambient temperature and low pressure can extract heat from the first heat medium in the evaporator. The first heat medium, which has undergone heat absorption, flows into the first heat exchanger 3 and flows into the condenser of the heat pump 5 after absorbing heat from the external environment in the first heat exchanger 3.

[0043] At the same time, after heat absorption, the liquid working fluid changes into a high-temperature, low-pressure gaseous working fluid. The high-pressure, low-pressure gaseous working fluid flows through the compressor 53 and is compressed into a high-temperature, high-pressure gaseous working fluid. The high-temperature, high-pressure gaseous working fluid enters a condenser to undergo a phase change and transfers its own heat to the first heat medium in the condenser. After heat absorption, the first heat medium flows into the first heat exchange channel 2a of the heat storage 2, further absorbs the heat in the heat storage 2, and finally flows into the first medium path 11 of the dryer 1.The gaseous working fluid changes into a liquid working fluid at ambient temperature and high pressure after heat release, the liquid working fluid at ambient temperature and high pressure flows through the expansion valve 54 and becomes a liquid working fluid at ambient temperature and low pressure, and the liquid working fluid at ambient temperature and low pressure re-enters the evaporator and undergoes a phase change to absorb the heat.

[0044] The heat pump 5 is provided to 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, thereby heating it. This prevents heat waste and improves heat utilization. At the same time, the heat pump 5 can lower the temperature of the first heat medium entering the first heat exchanger 3, allowing the first heat medium to absorb more heat in the first heat exchanger 3, thus improving the waste heat utilization efficiency of the sludge drying system.

[0045] With reference to Fig. 1, in some embodiments of the present application, the sludge drying system further comprises a third heat exchanger 6. The third heat exchanger 6 is provided internally with a third heat exchange channel 61 and a fourth heat exchange channel 62. The inlet port of the third heat exchange channel 61 is connected to the outlet port of the first media path 11, and the outlet port of the third heat exchange channel 61 is connected to the inlet port 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 through the third heat exchange channel 61 into the first heat exchanger 3.

[0046] The inlet port of the fourth heat exchange channel 62 is connected to the outlet port of the first heat exchanger 3, and the outlet port of the fourth heat exchange channel 62 is connected to the inlet port 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 through the fourth heat exchange channel 62 into the first heat exchange channel 2a of the heat storage device 2.

[0047] During operation of the sludge drying system in the embodiment of the present application, the first heat medium in the third heat exchange channel 61 is a medium flowing out of the dryer 1, and the first heat medium in the fourth heat exchange channel 62 is a medium flowing out of 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 of 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 storage 2 and continues to absorb heat before re-entering the dryer 1 for heating.In the embodiment of the present application, the third heat exchange channel 61 and the fourth heat exchange channel 62 may be the internal cavities of two independent pipes within the third heat exchanger 6. The two independent pipes are in contact with each other, or a heat-conducting structure 25 is provided between the two independent pipes, 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 is an internal cavity of the third heat exchanger 6, and the other of the third heat exchange channel 61 and the fourth heat exchange channel 62 is a pipe passing through the internal cavity of the third heat exchanger 6.In the embodiment of the present application, the structure of the third heat exchanger 6 can be adjusted according to actual needs and will not be repeated here.

[0048] With reference to Fig. 1, in some embodiments of the present application, the third heat exchanger 6 is connected between the heat pump 5 and the first heat exchanger 3.

[0049] Specifically, the inlet port of the third heat exchange channel 61 is connected to the outlet port of the first media path 11, and an outlet port of the third heat exchange channel 61 is connected to the inlet port of the cooling part 52. The outlet port of the cooling part 52 is connected to the inlet port of the first heat exchanger 3, and the outlet port of the first heat exchanger 3 is connected to the inlet port of the fourth heat exchange channel 62. The outlet port of the fourth heat exchange channel 62 is connected to the inlet port of the heating part 51, and the outlet port of the heating part 51 is connected to the inlet port of the first heat exchange channel 2a.

[0050] 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 after heat exchange in the third heat exchange channel 61 with the first heat medium in the fourth heat exchange channel 62, flow into the cooling part 52 of the heat pump 5. The first heat medium flowing out of the cooling part 52 of the heat pump 5 flows into the first heat exchanger 3, absorbs the heat from the external environment, and then flows into the fourth heat exchange channel 62 of the third heat exchanger 6. After heat absorption in the fourth heat exchange channel 62, the first heat medium enters the heating part 51 of the heat pump 5 to further absorb the heat, then flows into the first heat exchange channel 2a to further absorb the heat of the heat storage body 21, and finally flows back into the first medium path 11 of the dryer 1.

[0051] In the above process, the first heat medium flowing into the heating part 51 of the heat pump 5 is a medium flowing out of the fourth heat exchange channel 62 of the third heat exchanger 6. Before flowing into the heating part 51, the first heat medium has already absorbed some heat. This can reduce the amount of heat that the first heat medium needs to absorb to reach a predetermined temperature in the heating part 51, thereby reducing the energy consumption of the heat pump 5. Since heat exchange within the third heat exchanger 6 can occur spontaneously, reducing the energy consumption of the heat pump 5 can reduce the energy consumption of the entire sludge drying system. With reference to Fig. 1, in some embodiments of the present application, the dryer 1 further comprises a second media path 12. The second media path 12 serves to circulate a third heat medium that can be used or is used to dry the sludge. When the first heat medium is supplied to the first media path 11 and the third heat medium is supplied to the second media path 12, the heat of the first heat medium can be 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, wherein the first heat medium supplies heat energy to the third heat medium and the third heat medium dries the sludge. The first heat medium and the second heat medium can be made of the same material or of different materials.Preferably, in the embodiment of the present application, the first heat medium is water and the third heat medium is air. This contributes to reducing the operating costs of the sludge drying system in the embodiment of the present application.

[0052] In the embodiment of the present application, the structure of the dryer 1 can be adjusted according to actual needs; for example, the dryer 1 may adopt a fluidized bed. The dryer 1 includes a casing, in which a vibrating plate for laying the sludge is provided, and a vibration source device is provided below the vibrating plate. The vibrating plate can be vibrated by the vibration source device. The sludge is conveyed to the vibrating plate by means of a conveyor belt or a hopper and vibrates synchronously with the vibrating plate. The casing is provided with an air inlet pipe and an air outlet pipe, and the air inlet pipe, the air outlet pipe, and the internal cavity of the casing constitute the above-mentioned second media path 12.One of the air inlet pipe and the air outlet pipe is connected to an air pump to drive the air to flow in the second fluid path 12 by means of the air pump. The dryer 1 further includes a hot water pipe whose internal cavity is the first fluid path 11. The hot water pipe is provided in the internal cavity of the air outlet pipe, the air inlet pipe, or the casing to heat the air in the second fluid path 12. One end of the hot water pipe is connected to the first heat exchange channel 2a of the heat storage unit 2, and the other end is connected to the third heat exchange channel 61 of the third heat exchanger 6. The hot water pipe may be simultaneously connected to a water pump, and one of the air inlet pipe and the air outlet pipe may be connected to an air pump to obtain energy for fluid flow by means of the water pump and the air pump.

[0053] With reference to Fig. 1, in some embodiments of the present application, the sludge drying system further comprises a fourth heat exchanger 7. The fourth heat exchanger 7 comprises a fifth heat exchange channel 71 and a sixth heat exchange channel 72, wherein the inlet port of the fifth heat exchange channel 71 is connected to the outlet port of the second media path 12, and the outlet port of the fifth heat exchange channel 71 is connected to the inlet port of the second media path 12. The inlet port of the sixth heat exchange channel 72 is connected to the outlet port of the first heat exchanger 3, and the outlet port of the sixth heat exchange channel 72 is connected to the inlet port of the first heat exchange channel 2a.

[0054] After the third heat medium flows out of the second medium path 12 of the dryer 1, it can enter the fifth heat exchange channel 71 of the fourth heat exchanger 7 and then flow back from the fifth heat exchange channel 71 to the second medium path 12. At the same time, 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. Since the temperature of the third heat medium in the fifth heat exchange channel 71 is normally higher in this process, 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 to the first heat medium in the fourth heat exchanger 7. This improves heat utilization efficiency and effectively prevents heat waste.At the same time, this can prevent the third heat medium flowing out of the dryer 1 from being discharged directly into the external environment, thereby avoiding contamination of the external environment.

[0055] In the embodiment of the present application, the fifth heat exchange channel 71 and the sixth heat exchange channel 72 may be the internal cavities of two independent pipes within the fourth heat exchanger 7. The two independent pipes are in contact with each other, or a heat-conducting structure 25 is provided between the two independent pipes, 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 is an internal cavity of the fourth heat exchanger 7, and the other of the fifth heat exchange channel 71 and the sixth heat exchange channel 72 is a pipe passing through the internal cavity of the fourth heat exchanger 7.In the embodiment of the present application, the structure of the fourth heat exchanger 7 can be adjusted according to actual needs and will not be repeated here.

[0056] With reference to Fig. 1, in some embodiments of the present application, the fourth heat exchanger 7 is connected between the third heat exchanger 6 and the first heat exchanger 3.

[0057] In particular, the inlet port of the fifth heat exchange channel 71 is connected to the outlet port of the second media path 12, and the outlet port of the fifth heat exchange channel 71 is connected to the inlet port of the second media path 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 and, after the heat exchange in the fifth heat exchange channel 71 with the first heat medium in the sixth heat exchange channel 72, flow back into the dryer.

[0058] The inlet port of the sixth heat exchange channel 72 is connected to the outlet port of the first heat exchanger 3, and the outlet port of the sixth heat exchange channel 72 is connected to the inlet port 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, and after heat exchange in the third heat exchange channel 61 with the first heat medium in the fourth heat exchange channel 62, flow into the cooling part 52 of the heat pump 5. The first heat medium flowing out of the cooling part 52 of the heat pump 5 flows into the first heat exchanger 3, absorbs the heat from the external environment, and then flows into the sixth heat exchange channel 72 of the fourth heat exchanger 7.After the first heat medium absorbs the heat of the third heat medium in the sixth heat exchange channel 72, it enters the fourth heat exchange channel 62 to further absorb the heat. After absorbing heat in the fourth heat exchange channel 62, the first heat medium enters the heating part 51 of the heat pump 5 to further absorb the heat, then flows into the first heat exchange channel 2a to further absorb the heat of the heat storage body 21, and finally flows back into the first medium path 11 of the dryer 1.

[0059] In the above process, the first heat medium flowing out of the first heat exchanger 3 can be gradually heated as it sequentially passes through the fourth heat exchanger 7 and the third heat exchanger 6 to increase the temperature of the first heat medium flowing into the heating part 51 as much as possible. This can reduce the amount of heat that the first heat medium needs to absorb to reach a predetermined temperature in the heating part 51, thereby further reducing the energy consumption of the heat pump 5. Since the heat exchange within the third heat exchanger 6 and the fourth heat exchanger 7 can also occur spontaneously, reducing the energy consumption of the heat pump 5 can reduce the energy consumption of the entire sludge drying system.

[0060] For a better understanding, the operation of the sludge drying system in the embodiment of the present application will be explained in more detail in conjunction with specific temperature parameters. It should be noted that the temperature parameters described in the embodiment of the present application represent only one case and do not apply to all embodiments.

[0061] In one embodiment, the first heat exchanger 3 is arranged in an environment of the wastewater 100 in which the temperature of the wastewater 100 is approximately 10 to 12 degrees Celsius. The first heat medium in the first heat exchanger 3, after absorbing the temperature of the wastewater 100, flows into the sixth heat exchange channel 72 of the fourth heat exchanger 7 and absorbs the heat of 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 the heat of the first heat medium in the third heat exchange channel 61. The temperature of the first heat medium can reach 11 to 15 degrees Celsius after flowing out of the third heat exchanger 6.The first heat medium enters the heating part 51 of the heat pump 5 and continues to absorb heat, and the temperature of the first heat medium can reach about 55 degrees Celsius after flowing out of the heat pump 5. The first heat medium flowing out of the heat pump 5 enters the first heat exchange channel 2a of the heat storage 2 and continues to absorb heat, then flows into the dryer 1. At this time, the temperature of the first heat medium can reach about 90 degrees Celsius. The first heat medium and the third heat medium exchange heat in 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 of the dryer 1 flows into the third heat exchange channel 61 of the third heat exchanger 6 and undergoes further heat absorption therein, then flows into the cooling part 52 of the heat pump 5 to further dissipate heat.The temperature of the first heat medium drops to about 8 degrees Celsius after flowing out of the cooling part 52 of the heat pump 5, then it flows back into the first heat exchanger 3 to exchange heat with the wastewater 100.

[0062] The third heat medium in dryer 1 dries the sludge in dryer 1 after absorbing the heat from the first heat medium. The temperature of the third heat medium drops to 30-40 degrees Celsius after flowing out of dryer 1. The third heat medium flows into the fifth heat exchange channel 71 of the fourth heat exchanger 7, undergoes heat absorption, flows out of the fifth heat exchange channel 71, and flows back into dryer 1.

[0063] With reference to Fig. 2, in some embodiments of the present application, the heat storage body 21 is provided with a flow passage hole 211, and the first heat exchange channel 2a is a hole cavity of the flow passage hole 211. When the first heat medium flows through the flow passage hole 211, it can directly exchange heat with the heat storage body 21. This improves the heat exchange efficiency between the heat storage body 21 and the first heat medium, thus contributing to improving the drying efficiency of the sludge drying process. Specifically, the hole type of the flow passage hole 211 can be a rectangular hole, a circular hole, or even a specially shaped hole.The extending direction of the flow passage hole 211 can be set according to actual needs, specifically, the extending direction of the flow passage hole 211 can be set in a straight line along a straight direction, or it can be arranged in a serpentine shape along a curved direction.

[0064] With reference to Fig. 4, in some embodiments of the present application, it is possible for the heat storage body 21 not to be provided with a flow passage hole 211. That is, the heat storage device 2 includes a first heat transfer tube 23, wherein the first heat exchange channel 2a is the tube cavity of the first heat transfer tube 23. The first heat transfer tube 23 is in contact with the heat storage body 21, so that the first heat medium in the first heat transfer tube 23 can fully absorb the heat of the heat storage body 21. In the embodiment of the present application, the first heat transfer tube 23 preferably adopts a coiled 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 may be made of a heat-conducting material such as copper, aluminum, graphite, heat-conducting plastic, etc.manufactured to increase the thermal conductivity coefficient of the heat transfer path between the first heat medium and the heat storage body 21, thereby improving the efficiency of heat transfer between the first heat medium and the heat storage body 21. The first heat transfer tube 23 can be attached to the surface of the heat storage 2 by adhesive bonding; or the heat storage body 21 can be provided with holes or grooves for snap-fitting the first heat transfer tube 23, so that the first heat transfer tube 23 can be snap-fitted to the heat storage body 21.

[0065] With reference to Fig. 2 and Fig. 4, in some embodiments of the present application, the heat storage device 2 includes a second heat transfer tube 24. The above-mentioned second heat exchange channel 2b is the tube cavity of the second heat transfer tube 24. The second heat transfer tube 24 is in contact with the cooling end 22a of the thermoelectric semiconductor structure 22, so that the cooling end 22a can fully absorb the heat of the second heat medium within the second heat transfer tube 24. In the embodiment of the present application, the second heat transfer tube 24 preferably adopts a coiled tube to increase the contact area between the second heat transfer tube 24 and the cooling end 22a. The second heat transfer tube 24 may be made of a thermally conductive material such as copper, aluminum, graphite, thermally conductive plastic, etc.be manufactured to increase the thermal conductivity coefficient of the heat transfer path between the second heating medium and the cooling end 22a, thereby improving the efficiency of heat transfer between the second heating medium and the cooling end 22a. The second heat transfer tube 24 can be bonded to the thermoelectric semiconductor structure 22 using a thermally conductive adhesive; or the thermoelectric semiconductor structure 22 can be provided with holes or grooves for snap-fitting the second heat transfer tube 24, so that the second heat transfer tube 24 can be snap-fitted to the thermoelectric semiconductor structure 22. Referring to . Fig. 2 and Fig. 4, in some embodiments of the present application, a thermally conductive structure 25 is arranged between the heat storage body 21 and the heating end 22b of the thermoelectric semiconductor structure 22. In particular, the thermally conductive structure 25 may be a thermally conductive washer, a thermally conductive tube, a thermally conductive strip, and other structures. For example, the thermally conductive structure 25 may be a thermally conductive washer made of a thermally conductive material such as copper, aluminum, graphite, thermally conductive plastic, etc.The heat-conducting washer is interposed between the heat storage body 21 and the thermoelectric semiconductor structure 22, and the two side surfaces of the heat-conducting washer abut the heat storage body 21 and the heating end 22b of the thermoelectric semiconductor structure 22 to reduce the heat transfer coefficient between the heat storage body 21 and the heating end 22b, so that heat can be quickly transferred from the heating end 22b to the heat storage body 21. The heat-conducting structure 25 can also be a heat-conducting tube made of a heat-conducting material such as copper, aluminum, graphite, heat-conducting plastic, etc. The two side surfaces of the heat-conducting tube abut the heat storage body 21 and the heating end 22b of the thermoelectric semiconductor structure 22, and the heat-conducting tube is filled with a heat-conducting medium such as water, liquid metal, etc.filled to increase 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 tube 24 preferably adopts a coiled tube to increase the contact area of the heat-conducting tube with the heat storage body 21 and the thermoelectric semiconductor structure 22, and thus improve the heat transfer efficiency of the heat storage body 21 and the thermoelectric semiconductor structure 22. Referring to . Fig. 2 and Fig. 4, in some embodiments of the present application, the heat storage device 2 includes a heat insulation shell 26. The heat insulation shell 26 is a shell structure made of a heat insulation material such as rock wool, glass wool, polystyrene foam, etc. The heat insulation shell 26 has a heat-insulating inner cavity 261 inside, and the heat storage body 21, the thermoelectric semiconductor structure 22, and other structures are located within the heat insulation shell 26. With the arrangement of the heat insulation shell 26, it can be ensured that the heat of the heat storage body 21 and the thermoelectric semiconductor structure 22 is not easily radiated to the atmospheric environment, thereby reducing the heat loss of the heat storage device 2.

[0066] In the embodiment of the present application, the thermal insulation shell 26 is, in particular, a cubic-shaped frame structure, which also has a cubic-shaped heat-insulating inner cavity 261 inside. The thermoelectric semiconductor structure 22 is, in particular, a rectangular sheet structure and is embedded in the thermal insulation shell 26. The thermoelectric semiconductor structure 22 is provided with a rectangular through-hole, and the heat storage body 21 is embedded within the rectangular through-hole of the thermoelectric semiconductor structure 22. A portion of the thermoelectric semiconductor structure 22 facing the heat storage body 21 is a heating end 22b, and a portion facing away from the heat storage body 21 is a cooling end 22a.The heat storage body 21 is provided with a flow passage hole 211 for circulating the first heat medium, or a first heat transfer tube 23 for circulating the first heat medium is adhered to the surface of the heat storage body 21. A heat-conducting structure 25 is arranged between the heat storage body 21 and the heating end 22b of the thermoelectric semiconductor structure 22. The heat-conducting structure 25 preferably adopts a coiled tube, and the coiled tube is filled inside with a heat-conducting medium such as water. A second heat transfer tube 24 is provided between the cooling end 22a of the thermoelectric semiconductor structure 22 and the heat-insulating shell 26. The second heat transfer tube 24 also adopts a coiled tube in which the second heat medium circulates.The thermal insulation shell 26 and the thermoelectric semiconductor structure 22, as well as the thermoelectric semiconductor structure 22 and the heat storage body 21, can be secured by adhesive bonding using a thermally conductive adhesive, or the securing can be achieved by press fitting. The first heat transfer tube 23 can be firmly clamped between the heat storage body 21 and the thermoelectric semiconductor structure 22, or can be bonded between the heat storage body 21 and the thermoelectric semiconductor structure 22 using a thermally conductive adhesive. The second heat transfer tube 24 can be firmly clamped between the thermal insulation shell 26 and the thermoelectric semiconductor structure 22, or can be bonded between the thermal insulation shell 26 and the thermoelectric semiconductor structure 22 using a thermally conductive adhesive.

[0067] With reference to Fig.1, the fourth heat exchanger 7 in some embodiments of the present application has a condensation outlet 73. The condensation outlet 73 is connected to a fifth heat exchange channel 71. When gas is used as the third heat medium, the low-temperature, low-humidity gas, after flowing into the dryer 1, absorbs the temperature of the first heat medium and simultaneously absorbs the moisture separated from the sludge, and the gas is then converted into a high-temperature, high-humidity gas. The high-temperature, high-humidity gas exchanges heat with the first heat medium in the sixth heat exchange channel 72 after entering the fifth heat exchange channel 71 and undergoing heat exchange.At this time, the heat of the third heat medium can be transferred to the first heat medium, the temperature of the third heat medium drops, and the moisture in the third heat medium can condense in the fifth heat exchange channel 71. The condensation outlet 73 is connected to the fifth heat exchange channel 71, allowing the condensed water in the fifth heat exchange channel 71 to be discharged in a timely manner. This contributes to reducing the water content of the third heat medium flowing back from the fifth heat exchange channel 71 to the second medium path 12, thereby improving the sludge drying efficiency of the third heat medium.

[0068] In the specific implementation, the condensation outlet 73 may be arranged on a ground-facing side of the fifth heat exchange channel 71 so that the condensate in the fifth heat exchange channel 71 can flow out of the condensation outlet 73 under the action of gravity. A water-absorbing agent, such as quicklime, or a water-absorbing structure, such as a sponge strip, may also be provided within the condensation outlet 73 to improve the efficiency of condensate discharge. The discharged condensate may be used as the first heat medium to replenish the first heat exchanger 3, or it may be purified and recycled for other purposes to improve the utilization of water resources.

[0069] Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms used in this document are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0070] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly encompass one or more features. In the description of this application, "multiple" means two or more, unless otherwise specified. Furthermore, "and / or" in the description and claims refers to at least one of the connected objects, while the symbol " / " generally indicates an "or" relationship between the preceding and subsequent connected objects.

[0071] In the description of this application, it should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., refer to the directions or positions shown in the accompanying drawings and are used only to simplify the description of this application and are not to be taken as an indication or suggestion that the designated devices or elements have a particular orientation or must be constructed and operated in a particular orientation, and are therefore not to be construed as a limitation of this application.

[0072] In the description of this application, it should be noted that the terms "installed," "connected," and "connected" are to be understood in the broadest sense, unless expressly stated and limited otherwise. For example, it may be a fixed connection, a detachable connection, or an integrated connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection via an intermediate medium, or it may be a connection between two elements. A person skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0073] In the description of this manual, terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "concrete example," or "some examples" refer to the specific features, structures, materials, or properties described in connection with the embodiment or example and included in at least one embodiment or example of this application. In this description, the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the described specific features, structures, materials, or properties may be combined in one or more embodiments or examples as appropriate.

[0074] Although embodiments of the present application have been shown and described, it will be apparent to those skilled in the art that these embodiments are susceptible to various changes, modifications, substitutions, and variations without departing from the spirit and scope of the present application, the scope of the present application being limited by the claims and their equivalents.

Claims

[1] Sludge drying system, characterized by that it includes: a dryer (1) usable for drying the sludge, the dryer (1) comprising a first media path (11) usable for circulating a first heat medium; a heat storage device (2) comprising a heat storage body (21), a thermoelectric semiconductor structure (22), a first heat exchange channel (2a), and a second heat exchange channel (2b), wherein the heat storage body (21) can be used to store heat, wherein the thermoelectric semiconductor structure (22) has a cooling end (22a) and a heating end (22b), wherein, when the thermoelectric semiconductor structure (22) is switched on, the cooling end (22a) absorbs the heat in the second heat exchange channel (2b), wherein the heat generated by the heating end (22b) can be transferred to the heat storage body (21), wherein the output connection of the first heat exchange channel (2a) is connected to the input connection of the first media path (11), wherein, when the first heat medium is supplied to the first heat exchange channel (2a), the heat of the heat storage body (21) can be transferred to the first heat medium,and wherein the second heat exchange channel (2b) can be used to circulate a second heat medium;, a first heat exchanger (3), wherein the inlet connection of the first heat exchanger (3) is connected to the outlet connection of the first media path (11), wherein the outlet connection of the first heat exchanger (3) is connected to the inlet connection of the first heat exchange channel (2a), and wherein, when the first heat medium is supplied to the first heat exchanger (3), the heat of the external environment can be transferred to the first heat medium; a second heat exchanger (4), wherein the inlet port of the second heat exchanger (4) is connected to the outlet port of the second heat exchange channel (2b), wherein the outlet port of the second heat exchanger (4) is connected to the inlet port of the second heat exchange channel (2b), and wherein, when the second heat medium is supplied to the second heat exchanger (4), the heat of the external environment can be transferred to the second heat medium. [2] Sludge drying system according to claim 1, characterized byin that the sludge drying system further comprises a heat pump (5); wherein the heat pump (5) has a heating part (51) and a cooling part (52), wherein the inlet connection of the heating part (51) is connected to the outlet connection of the first heat exchanger (3), wherein the outlet connection of the heating part (51) is connected to the inlet connection of the first heat exchange channel (2a), wherein the inlet connection of the cooling part (52) is connected to the outlet connection of the first media path (11), and wherein the outlet connection of the cooling part (52) is connected to the inlet connection of the first heat exchanger (3). [3] Sludge drying system according to claim 2, characterized by that the sludge drying system further comprises a third heat exchanger (6); wherein the third heat exchanger comprises a third heat exchange channel (61) and a fourth heat exchange channel (62), wherein the inlet connection of the third heat exchange channel (61) is connected to the outlet connection of the first media path (11), and wherein the outlet connection of the third heat exchange channel (61) is connected to the inlet connection of the first heat exchanger (3); wherein the inlet port of the fourth heat exchange channel (62) is connected to the outlet port of the first heat exchanger (3), and wherein the outlet port of the fourth heat exchange channel (62) is connected to the inlet port of the first heat exchange channel (2a); and wherein, when the first heat medium is supplied to 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 transferable to the first heat medium in the fourth heat exchange channel (62). [4] Sludge drying system according to claim 3, characterized by that the third heat exchanger (6) is connected between the heat pump (5) and the first heat exchanger (3), wherein the output connection of the third heat exchange channel (61) is connected to the input connection of the cooling part (52), and wherein the output connection of the fourth heat exchange channel (62) is connected to the input connection of the heating part (51). [5] Sludge drying system according to claim 3 or 4, characterized by in that the dryer (1) further comprises a second media path (12) which can be used to circulate a third heat medium which can be used to dry the sludge; wherein, when the first heat medium is supplied to the first media path (11) and the third heat medium is supplied to the second media path (12), the heat of the first heat medium can be transferred to the third heat medium. [6] Sludge drying system according to claim 5, characterized bythat the sludge drying system further comprises a fourth heat exchanger (7); wherein the fourth heat exchanger (7) comprises a fifth heat exchange channel (71) and a sixth heat exchange channel (72), wherein the inlet connection of the fifth heat exchange channel (71) is connected to the outlet connection of the second media path (12), and wherein the outlet connection of the fifth heat exchange channel (71) is connected to the inlet connection of the second media path (12); wherein the inlet port of the sixth heat exchange channel (72) is connected to the outlet port of the first heat exchanger (3), and wherein the outlet port of the sixth heat exchange channel (72) is connected to the inlet port of the first heat exchange channel (2a); and wherein, when the first heat medium is supplied to the fifth heat exchange channel (71) and the first heat medium is supplied to the sixth heat exchange channel (72), the heat of the third heat medium in the fifth heat exchange channel (71) can be transferred to the first heat medium in the sixth heat exchange channel (72). [7] Sludge drying system according to claim 6, characterized by that the fourth heat exchanger (7) is connected between the third heat exchanger (6) and the first heat exchanger (3), wherein the output connection of the sixth heat exchange channel (72) is connected to the input connection of the fourth heat exchange channel (62). [8] Sludge drying system according to one of claims 1 to 7, characterized by that the heat storage body (21) is provided with a flow passage hole (211), wherein the first heat exchange channel (2a) is a hole cavity of the flow passage hole (211). [9] Sludge drying system according to one of claims 1 to 8, characterized by in that the heat accumulator (2) comprises a first heat transfer tube (23), wherein the first heat exchange channel (2a) is the tube cavity of the first heat transfer tube (23), and wherein the first heat transfer tube (23) is in contact with the heat storage body (21). [10] Sludge drying system according to one of claims 1 to 9, characterized by in that the heat accumulator (2) comprises a second heat transfer tube (24), wherein the second heat exchange channel (2b) is the tube cavity of the second heat transfer tube (24), and wherein the second heat transfer tube (24) is in contact with the cooling end (22a) of the thermoelectric semiconductor structure (22). [11] Sludge drying system according to one of claims 1 to 10, characterized bythat a heat-conducting structure (25) is arranged between the heat storage body (21) and the heating end (22b) of the thermoelectric semiconductor structure (22), wherein the heat-conducting structure (25) is simultaneously in contact with the heat storage body (21) and the heating end (22b) of the thermoelectric semiconductor structure (22). [12] Sludge drying system according to one of claims 1 to 11, characterized by in that the heat accumulator (2) comprises a heat-insulating shell (26); wherein the heat-insulating shell (26) has a heat-insulating inner cavity (261) on the inside, and wherein the heat accumulator body (21) and the thermoelectric semiconductor structure (22) are each located within the heat-insulating inner cavity (261). [13] Sludge drying system according to claim 6 and optionally one of claims 7 to 12, characterized bythat the fourth heat exchanger (7) has a condensation outlet (73) which is connected to the fifth heat exchange channel (71).

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