A continuous feed and discharge low temperature vacuum drying system

Abstract

This application relates to the field of material drying, and in particular to a continuous feed and discharge low-temperature vacuum drying system. The system includes: a material input mechanism comprising a feeder, a first buffer device, a second buffer device, and a first discharge device; the feeder is connected to one end of the first and second buffer devices, and the discharge device is connected to the other end; a dryer connected to the first discharge device; a material output mechanism comprising a distributor, a third buffer device, a fourth buffer device, and a second discharge device; the distributor is connected to one end of the dryer and the third and fourth buffer devices, and the second discharge device is connected to the other end of the third and fourth buffer devices; a heat pump mechanism comprising a hot water circulation component and a cold water circulation component; and a vacuum mechanism connecting the cold water circulation component, the first buffer device, the second buffer device, the third buffer device, the fourth buffer device, and the dryer. This application enables efficient, energy-saving, and environmentally friendly continuous sludge processing.

Description

Technical Field

[0001] This application relates to the field of material drying, and in particular to a low-temperature vacuum drying system with continuous feeding and discharging. Background Technology

[0002] With the acceleration of urbanization and the continuous expansion of sewage treatment scale, the amount of sludge produced is increasing daily. Sludge not only contains a large amount of water, but also accumulates harmful substances such as heavy metals, pathogens, and organic pollutants. If not properly treated, it will cause serious pollution to the soil, water bodies, and atmospheric environment, threatening ecological balance and human health.

[0003] Currently, the mainstream traditional sludge drying processes mainly include low-temperature belt drying, disc drying, and integrated plate and frame dewatering and drying machines. However, each of these processes has significant shortcomings and limitations in practical applications. For example, low-temperature belt dryers have complex structures, large internal airflow volumes, localized positive pressure, high levels of odor and dust, poor environmental friendliness, and high equipment failure rates. Disc drying requires high-temperature heat sources such as steam or heat transfer oil, resulting in high energy dependence, high energy consumption, severely limited application scenarios, and significant odor and dust levels, posing a certain risk of dust explosion. Integrated plate and frame dewatering and drying machines operate in an open state during sludge unloading, posing a risk of odor diffusion. Furthermore, they operate on a batch production basis, resulting in low single-machine capacity and high investment and spare parts costs.

[0004] Overall, traditional sludge drying processes have shortcomings in both environmental friendliness and energy conservation, which seriously restricts their promotion and application. Furthermore, conventional vacuum drying equipment is mostly intermittent, resulting in low production efficiency, high labor costs, and significant batch-to-batch product quality variations when processing large quantities of material. This not only limits the expansion of production scale but also makes it difficult to meet the growing market demand for high-quality, stable products.

[0005] Therefore, developing a new type of sludge drying system that is efficient, energy-saving, environmentally friendly, and capable of continuous operation is of great significance for solving the increasingly serious problem of sludge drying and realizing the reduction, stabilization, harmlessness, and resource utilization of sludge. Utility Model Content

[0006] The purpose of this application is to overcome the above-mentioned technical problems and provide a low-temperature vacuum drying system with continuous feeding and discharging, which can realize efficient, energy-saving and environmentally friendly continuous sludge operation, thereby achieving sludge reduction, stabilization, harmlessness and resource utilization.

[0007] This application discloses a continuous feed and discharge low-temperature vacuum drying system, which specifically adopts the following scheme: A continuous feed-discharge low-temperature vacuum drying system includes: a material input mechanism comprising a feeding component, a first buffer device, a second buffer device, and a first discharge component, wherein the feeding component is connected to one end of the first buffer device and the second buffer device, and the first discharge component is connected to the other end of the first buffer device and the second buffer device; a dryer connected to the first discharge component for receiving sludge material conveyed by the first discharge component and drying and outputting it; a material output mechanism comprising a distributing component, a third buffer device, a fourth buffer device, and a second discharge component, wherein the distributing component is connected to the dryer and one end of the third buffer device and the fourth buffer device, and the second discharge component is connected to the other end of the third buffer device and the fourth buffer device; a heat pump mechanism comprising a hot water circulation component and a cold water circulation component, wherein the hot water circulation component is connected to the dryer and the cold water circulation component; and a vacuum mechanism connecting the cold water circulation component, the first buffer device, the second buffer device, the third buffer device, the fourth buffer device, and the dryer.

[0008] By adopting the above technical solution, in the context of sludge drying treatment, the feeding component in the material input mechanism sequentially conveys the sludge material to the first and second buffer devices. During feeding, the first and second buffer devices are switched to ensure continuous feeding and avoid interruptions. The first discharge component then conveys the material to the dryer for drying. The dryer receives the material, dries it, and outputs it, achieving sludge drying treatment. In the material output mechanism, the separating component sequentially conveys the dried material to the third and fourth buffer devices. During discharge, the third and fourth buffer devices are switched to ensure continuous discharge. The second discharge component outputs the dried material. The hot water circulation component and cold water circulation component of the heat pump mechanism work together to provide suitable temperature conditions for the dryer, ensuring the smooth operation of the drying process. The vacuum mechanism connects the buffer devices, the dryer, and the cold water circulation component, creating a low-temperature vacuum environment to improve drying efficiency. Simultaneously, it treats exhaust gas and recovers waste heat, reducing energy consumption and operating costs.

[0009] Optionally, it further includes: a first electrically controlled sealing valve is provided at the upper end of the first buffer device, a second electrically controlled sealing valve is provided at the lower end of the first buffer device, and a first pressure detector is provided on the first buffer device; a third electrically controlled sealing valve is provided at the upper end of the second buffer device, a fourth electrically controlled sealing valve is provided at the lower end of the second buffer device, and a second pressure detector is provided on the second buffer device; a fifth electrically controlled sealing valve is provided at the upper end of the third buffer device, a sixth electrically controlled sealing valve is provided at the lower end of the third buffer device, and a third pressure detector is provided on the third buffer device; a seventh electrically controlled sealing valve is provided at the upper end of the fourth buffer device, an eighth electrically controlled sealing valve is provided at the lower end of the fourth buffer device, and a fourth pressure detector is provided on the fourth buffer device.

[0010] By adopting the above technical solution, the first buffer device is equipped with a first electrically controlled sealing valve at its upper end to control the entry of materials into the first buffer device and prevent material leakage and the entry of outside air; a second electrically controlled sealing valve is equipped with a second electrically controlled sealing valve at its lower end to control the output of materials from the first buffer device and ensure the orderly conveying of materials; a first pressure detector is equipped with a first pressure detector to monitor the pressure inside the first buffer device in real time so as to perform corresponding operations according to pressure changes. The second buffer device is equipped with a third electrically controlled sealing valve at its upper end to control the entry of materials into the second buffer device and prevent material leakage and the entry of outside air; a fourth electrically controlled sealing valve is equipped with a fourth electrically controlled sealing valve at its lower end to control the output of materials from the second buffer device and ensure the orderly conveying of materials; a second pressure detector is equipped with a second pressure detector to monitor the pressure inside the second buffer device in real time so as to perform corresponding operations according to pressure changes. The third buffer unit is equipped with a fifth electrically controlled sealing valve at its upper end to control material entry into the third buffer unit, preventing material leakage and the entry of outside air. A sixth electrically controlled sealing valve is installed at the lower end of the third buffer unit to control material output from the third buffer unit, ensuring orderly material transport. A third pressure detector is installed on the third buffer unit to monitor the pressure within the unit in real time, allowing for appropriate operations based on pressure changes. The fourth buffer unit is equipped with a seventh electrically controlled sealing valve at its upper end to control material entry into the fourth buffer unit, preventing material leakage and the entry of outside air. An eighth electrically controlled sealing valve is installed at the lower end of the fourth buffer unit to control material output from the unit, ensuring orderly material transport. A fourth pressure detector is installed on the fourth buffer unit to monitor the pressure within the unit in real time, allowing for appropriate operations based on pressure changes.

[0011] Optionally, it further includes: a first electrically controlled valve connected between the vacuum mechanism and the first buffer device; a second electrically controlled valve connected between the vacuum mechanism and the second buffer device; a third electrically controlled valve connected between the vacuum mechanism and the third buffer device; and a fourth electrically controlled valve connected between the vacuum mechanism and the fourth buffer device.

[0012] By adopting the above technical solution, in the continuous feeding and discharging low-temperature vacuum drying system, the first electrically controlled valve is connected to the vacuum mechanism and the first buffer device, the second electrically controlled valve is connected to the vacuum mechanism and the second buffer device, the third electrically controlled valve is connected to the vacuum mechanism and the third buffer device, and the fourth electrically controlled valve is connected to the vacuum mechanism and the fourth buffer device. This enables independent control of the pathways between each buffer device and the vacuum mechanism, flexible adjustment of the vacuum degree of each buffer device, and facilitates stable material conveying and efficient system operation. At the same time, in conjunction with the material input mechanism, dryer, material output mechanism, heat pump mechanism, and vacuum mechanism, the system can better perform continuous feeding and discharging of sludge materials and low-temperature vacuum drying.

[0013] Optionally, the vacuum mechanism includes: a vacuum pump connected to an external deodorization system for extracting exhaust gas and delivering it to the deodorization system; a condensate tank connected to the vacuum pump for buffering the condensate drained from the exhaust gas; and a waste heat recovery heat exchanger connected to the condensate tank, the first buffer device, the second buffer device, the third buffer device, the fourth buffer device, and the dryer.

[0014] By adopting the above technical solution, the vacuum pump delivers the extracted exhaust gas to the deodorization system, which can reduce the emission of odorous exhaust gas in the system and reduce environmental pollution; the condensate tank buffers the condensate drained from the exhaust gas, which facilitates centralized treatment of the condensate; the waste heat recovery heat exchanger connects each buffer device and the dryer, which can recover and utilize the waste heat in the system and improve energy utilization efficiency.

[0015] Optionally, the hot water circulation assembly includes: a water source heat pump, a first water pump, and a hot water tank. The two ends of the water source heat pump are an evaporation end and a condensation end, respectively. The return water inlet of the dryer is connected to the inlet of the hot water tank via a water pipe. The outlet of the hot water tank is connected to the inlet of the first water pump via a water pipe. The outlet of the first water pump is connected to the inlet of the dryer via a water pipe passing through the evaporation end of the water source heat pump, thereby forming a hot water circulation. The outlet of the waste heat recovery heat exchanger is connected to the cold water circulation assembly via a water pipe, and is also connected to the return water inlet of the waste heat recovery heat exchanger via a water pipe passing through the condensation end of the water source heat pump, thereby forming a cold water circulation.

[0016] By adopting the above technical solution, the return water inlet of the dryer in the hot water circulation assembly is connected to the inlet of the hot water tank via a water pipe, and the outlet of the hot water tank is connected to the inlet of the first water pump via a water pipe. The outlet of the first water pump is connected to the inlet of the dryer via a water pipe passing through the evaporation end of the water source heat pump to form a hot water circulation. This allows the hot water to circulate continuously, providing heat to the dryer and ensuring the stable operation of the dryer for sludge drying. The outlet of the waste heat recovery heat exchanger is connected to the cold water circulation assembly via a water pipe, and the outlet of the waste heat recovery heat exchanger is connected to the return water inlet of the waste heat recovery heat exchanger via a water pipe passing through the condensation end of the water source heat pump to form a cold water circulation. This enables the recovery and utilization of waste heat, improves energy utilization efficiency, and reduces system energy consumption.

[0017] Optionally, the cold water circulation assembly includes: a cold water tank and a second water pump. The outlet of the waste heat recovery heat exchanger is connected to the inlet of the cold water tank via a water pipe. The outlet of the cold water tank is connected to the inlet of the second water pump via a water pipe. The outlet of the second water pump is connected to the return port of the water source heat pump via a water pipe passing through the condenser end of the water source heat pump, thereby forming a cold water circulation.

[0018] By adopting the above technical solution, the cold water circulation component includes a cold water tank and a second water pump. The outlet of the waste heat recovery heat exchanger is connected to the inlet of the cold water tank via a water pipe, allowing the water flowing out of the waste heat recovery heat exchanger to enter the cold water tank for buffering. The outlet of the cold water tank is connected to the inlet of the second water pump via a water pipe, enabling the second water pump to provide power for the water flow. The outlet of the second water pump is connected to the return port of the water source heat pump via a water pipe passing through the condenser end of the water source heat pump to form a cold water circulation. This enables the cold water to circulate at the condenser end of the water source heat pump, which helps with the heat exchange of the water source heat pump, improves energy utilization efficiency, and enhances the overall performance of the system.

[0019] Optionally, the vacuum mechanism further includes: a cooling heat exchanger connected between the condensate tank and the waste heat recovery heat exchanger, and provided with an external cooling water inlet and a return water outlet; wherein an outlet of the waste heat recovery heat exchanger is connected to the cold water tank.

[0020] By adopting the above technical solution, the cooling heat exchanger can cool the exhaust gas between the condensate tank and the waste heat recovery heat exchanger. External cooling water enters from the inlet and flows out from the return water outlet to achieve further cooling function and meet emission requirements.

[0021] Optionally, the bottom of the condensate tank is connected to an external sewage system to output the condensate.

[0022] By adopting the above technical solution, the condensate tank can perform gas-liquid separation on the cooled exhaust gas and recover the condensate from the exhaust gas to be discharged into the sewage treatment system for treatment through the drain outlet. In addition, the exhaust gas after gas-liquid separation is discharged into the deodorization system for treatment through a vacuum pump.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The first and second buffer devices are switched during feeding to ensure continuous feeding. When discharging the dried material in conjunction with the material distribution unit, the third and fourth buffer devices are switched to achieve continuous feeding and discharging of sludge material. This solves the problems of low production efficiency, high labor costs, and large batch-to-batch product quality differences caused by the intermittent operation of conventional vacuum drying equipment.

[0024] 2. The hot water circulation component and cold water circulation component of the heat pump mechanism work together to effectively utilize waste heat, reduce energy dependence, and solve the problem of high energy consumption in traditional sludge drying processes. 3. The vacuum mechanism connects various buffer devices, dryers, and cold water circulation components, creating a low-temperature vacuum environment and improving drying efficiency. In addition, the vacuum mechanism transports the extracted exhaust gas to the deodorization system, reducing odor and dust emissions, improving environmental friendliness, and solving the problem of poor environmental friendliness in traditional sludge drying processes. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a continuous feeding and discharging low-temperature vacuum drying system disclosed in an embodiment of this application; Figure 2 for Figure 1 A partial structural schematic diagram of a continuous feed and discharge low-temperature vacuum drying system is disclosed.

[0026] Explanation of reference numerals in the attached figures: 10. Material input mechanism; 11. Feeding component; 12. First buffer device; 121. First electrically controlled sealing valve; 122. Second electrically controlled sealing valve; 13. Second buffer device; 131. Third electrically controlled sealing valve; 132. Fourth electrically controlled sealing valve; 14. First discharge component; 20. Dryer; 30. Material output mechanism; 31. Material distribution component; 32. Third buffer device; 321. Fifth electrically controlled sealing valve; 322. Sixth electrically controlled sealing valve; 33. Fourth buffer device; 331. Seventh electrically controlled sealing valve ; 332, Eighth electrically controlled sealing valve; 34, Second discharge component; 40, Heat pump mechanism; 41, Hot water circulation assembly; 411, Water source heat pump; 412, First water pump; 413, Hot water tank; 42, Cold water circulation assembly; 421, Cold water tank; 422, Second water pump; 50, Vacuum mechanism; 51, Vacuum pump; 52, Condensate tank; 53, Waste heat recovery heat exchanger; 60, First electrically controlled valve; 70, Second electrically controlled valve; 80, Third electrically controlled valve; 90, Fourth electrically controlled valve; 100, Cooling heat exchanger. Detailed Implementation

[0027] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this application refers to and includes any or all possible combinations of one or more of the listed items.

[0028] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0029] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0030] See Figure 1 and Figure 2 The first embodiment of this application discloses a low-temperature vacuum drying system with continuous feeding and discharging, including: a material input mechanism 10, a dryer 20, a material output mechanism 30, a heat pump mechanism 40, and a vacuum mechanism 50.

[0031] The material input mechanism 10 is equipped with a buffer device to continuously transport sludge to the dryer 20 for drying. The dried material is output through the material output mechanism 30. The heat pump mechanism 40 provides heat to the dryer 20 and recovers waste heat, thereby reducing energy consumption. The vacuum mechanism 50 extracts exhaust gas to maintain a vacuum environment in the system, reducing odor and dust emissions. Thus, the system achieves efficient, energy-saving, environmentally friendly, and continuous sludge processing.

[0032] Specifically, the material input mechanism 10 includes a feeding component 11, a first buffer device 12, a second buffer device 13, and a first discharge component 14. The feeding component 11 is connected to one end of the first buffer device 12 and the second buffer device 13, and the discharge component is connected to the other end of the first buffer device 12 and the second buffer device 13. In this embodiment, the first buffer device 12 and the second buffer device 13 are fed in and discharged in sequence, so as to achieve uninterrupted operation.

[0033] Both the feeding unit 11 and the first discharge unit 14 utilize screw conveyors to transport sludge material, and their outer shells are sealed to prevent sludge and odor leakage. The first buffer device 12 and the second buffer device 13 are silos, and the inner walls of the silos can be made of smooth stainless steel to reduce sludge adhesion. The shape of the silos is as follows... Figure 1 The material has a cylindrical shape as shown. The feeder 11 is connected to the upper port of the first buffer device 12 and the second buffer device 13 to ensure that the material can smoothly enter the buffer device. The lower port of the first buffer device 12 and the second buffer device 13 is connected to the first discharge device 14.

[0034] To improve the sealing performance of the first buffer device 12 and the second buffer device 13, a first electrically controlled sealing valve 121 is provided at the upper end of the first buffer device 12, a second electrically controlled sealing valve 122 is provided at the lower end, and a first pressure detector (not shown in the figure) is provided on the first buffer device 12. A third electrically controlled sealing valve 131 is provided at the upper end of the second buffer device 13, a fourth electrically controlled sealing valve 132 is provided at the lower end, and a second pressure detector (not shown in the figure) is provided on the first buffer device 12.

[0035] In addition, in order to realize the vacuuming function, a first electrically controlled valve 60 is provided between the vacuum mechanism 50 and the first buffer device 12, and a second electrically controlled valve 70 is provided between the vacuum mechanism 50 and the second buffer device 13.

[0036] For example, when feeding material into the first buffer device 12, the first electrically controlled sealing valve 121 is opened and the second electrically controlled sealing valve 122 is closed (the first electrically controlled valve 60 is closed). When the pressure value detected by the first pressure detector reaches a preset threshold, the first solenoid valve is controlled to open to perform vacuuming. When the pressure value reaches another preset threshold, the first buffer device 12 is controlled to discharge material, thereby closing the first electrically controlled sealing valve 121 and opening the second electrically controlled sealing valve 122. The sludge material is then transported to the flower drying machine through the first discharge component 14. At the same time, the second buffer device 13 is switched to feed material, the third electrically controlled sealing valve 131 is opened, and the fourth electrically controlled sealing valve 132 is closed (the second electrically controlled valve 70 is closed). After feeding, when the pressure value detected by the second pressure detector reaches a preset threshold, the second electrically controlled valve 70 is controlled to open to perform shaft vacuuming. When the pressure value reaches another preset threshold, the second buffer device 13 is controlled to discharge material, thereby closing the third electrically controlled sealing valve 131 and opening the fourth electrically controlled valve 132. By setting up the first buffer device 12, the second buffer device 13 and the vacuum mechanism 50, the material can be continuously and stably transported to the dryer 20, avoiding the dryer 20 from shutting down due to untimely material supply.

[0037] The dryer 20 is connected to the first discharge unit 14 and is used to receive the sludge material conveyed by the first discharge unit 14 and dry it for output. The dryer 20 can be a low-temperature vacuum paddle dryer 20, which evaporates the moisture in the sludge through the stirring and heating of the paddles. The shape of the paddles can be wedge-shaped, spiral-shaped, etc., to increase the contact area with the sludge and improve the drying efficiency. The outer shell of the dryer 20 can be wrapped with heat insulation material to reduce heat loss. The dryer 20 is equipped with temperature and pressure sensors to monitor the temperature and pressure inside the dryer 20 in real time, ensuring the stability and safety of the drying process.

[0038] The material output mechanism 30 includes a material distribution component 31, a third buffer device 32, a fourth buffer device 33, and a second discharge component 34. The material distribution component 31 is connected to one end of the dryer 20 and the third buffer device 32 and the fourth buffer device 33, which is the upper end. The second discharge component 34 is connected to the other end of the third buffer device 32 and the fourth buffer device 33, which is the lower end.

[0039] The material distribution unit 31 and the second discharge unit 34, like the feeding unit 11 and the first discharge unit 14, all use screw conveyors to transport sludge materials. Their outer shells are sealed to prevent sludge and odor leakage. The third buffer unit 32 and the fourth buffer unit 33, like the first buffer unit 12 and the second buffer unit 13, are silos. The inner walls of the silos can be made of smooth stainless steel to reduce sludge adhesion. The shape of the silos is as follows... Figure 1 The cylindrical shape is shown. The material distribution component 31 connects to the upper ports of the third buffer device 32 and the fourth buffer device 33, ensuring that materials can smoothly enter the buffer devices. The lower ports of the first buffer device 12 and the second buffer device 13 are connected to the second discharge component 34.

[0040] To improve the sealing performance of the third buffer device 32 and the fourth buffer device 33, a fifth electrically controlled sealing valve 321 is provided at the upper end of the third buffer device 32, a sixth electrically controlled sealing valve 322 is provided at the lower end, and a third pressure detector (not shown in the figure) is provided on the third buffer device 32. A seventh electrically controlled sealing valve 331 is provided at the upper end of the fourth buffer device 33, an eighth electrically controlled sealing valve 332 is provided at the lower end, and a fourth pressure detector (not shown in the figure) is provided on the fourth buffer device 33.

[0041] In addition, in order to realize the vacuuming function, a third electrically controlled valve 80 is provided between the vacuum mechanism 50 and the third buffer device 32, and a fourth electrically controlled valve 90 is provided between the vacuum mechanism 50 and the fourth buffer device 33.

[0042] For example, when feeding into the third buffer device 32, the fifth electrically controlled sealing valve 321 is open and the sixth electrically controlled sealing valve 322 is closed (the third electrically controlled valve 80 is closed). When the pressure value detected by the third pressure detector reaches a preset threshold, the third solenoid valve is controlled to open to perform vacuuming. When the pressure value reaches another preset threshold, the third buffer device 32 is controlled to discharge, thereby closing the fifth electrically controlled sealing valve 321 and opening the sixth electrically controlled sealing valve 322. The sludge material is then transported to the dry sludge silo via the second discharge component 34. At the same time, the fourth buffer device 33 is switched to feed, the seventh electrically controlled sealing valve 331 is opened and the eighth electrically controlled sealing valve 332 is closed (the fourth electrically controlled valve 90 is closed). After feeding, when the pressure value detected by the fourth pressure detector reaches a preset threshold, the fourth electrically controlled valve 90 is controlled to open to perform shaft vacuuming. When the pressure value reaches another preset threshold, the fourth buffer device 33 is controlled to discharge, thereby closing the seventh electrically controlled sealing valve 331 and opening the eighth electrically controlled valve 332. By setting up the third buffer device 32, the fourth buffer device 33 and the vacuum mechanism 50, the vacuum-dried material can be continuously and stably transported to the dry sludge silo.

[0043] The heat pump mechanism 40 includes a hot water circulation assembly 41 and a cold water circulation assembly 42. The hot water circulation assembly 41 connects the dryer 20 and the cold water circulation assembly 42. The hot water circulation assembly 41 includes a water source heat pump 411, a first water pump 412, and a hot water tank 413. The water source heat pump 411 is a device that utilizes low-grade heat energy resources from nature for heating and cooling. It consists of a compressor, evaporator, condenser, and throttling device. The first water pump 412 provides the power for hot water circulation and generally consists of a pump body, impeller, and motor. The hot water tank 413 stores hot water and plays a role in smoothing out fluctuations in water flow and volume. It can be an insulated water tank to reduce heat loss. The return water inlet of the dryer 20 is connected to the inlet of the hot water tank 413 via a water pipe. The outlet of the hot water tank 413 is connected to the inlet of the first water pump 412 via a water pipe. The outlet of the first water pump 412 is connected to the inlet of the dryer 20 via a water pipe passing through the evaporator (i.e., the evaporator) of the water source heat pump 411, forming a hot water circulation. In this circulation process, the hot water releases heat in the dryer 20 and returns to the hot water tank 413. Then, it is drawn by the first water pump 412 to the evaporator of the water source heat pump 411 for reheating, providing continuous heat for the dryer 20.

[0044] The cold water circulation assembly 42 includes a cold water tank 421 and a second water pump 422. The cold water tank 421 stores cold water and smooths out fluctuations in water flow and volume. The second water pump 422 provides the power for the cold water circulation. The outlet of the waste heat recovery heat exchanger 53 is connected to the inlet of the cold water tank 421 via a water pipe. The outlet of the cold water tank 421 is connected to the inlet of the second water pump 422 via a water pipe. The outlet of the second water pump 422 is connected to the return port of the water source heat pump 411 via a water pipe passing through the condenser end (i.e., the condenser) of the water source heat pump 411, forming a cold water circulation. In this circulation, the cold water absorbs heat from the waste heat recovery heat exchanger 53 and releases heat through the condenser end of the water source heat pump 411, realizing the recycling of heat.

[0045] In this embodiment, a water source heat pump 411 is used for heating and waste heat recovery, significantly reducing the system's energy consumption. The water source heat pump 411 features a high energy efficiency ratio, minimal operational fluctuations, and stable heating. By utilizing the low-grade heat energy contained in the water body, the heat pump unit elevates it to high-grade heat energy, providing continuous and stable heating for the sludge drying process. Simultaneously, waste heat recovery enables internal heat circulation, maintaining a constant high water temperature on the cold water side of the water source heat pump 411. This maximizes the high energy efficiency ratio of the water source heat pump 411 while avoiding the impact of ambient temperature fluctuations and dependence on external water sources, thus maximizing energy conservation and emission reduction. Ultimately, this achieves precise control of the drying temperature while significantly reducing the overall operating cost and carbon emissions of sludge treatment, demonstrating significant cost advantages and environmental value in the field of sludge drying.

[0046] The vacuum mechanism 50 connects the cold water circulation assembly 42, the first buffer device 12, the second buffer device 13, the third buffer device 32, the fourth buffer device 33, and the dryer 20 to evacuate each component and ensure the vacuum level of the drying system.

[0047] The vacuum mechanism 50 includes a vacuum pump 51, a condensate tank 52, and a waste heat recovery heat exchanger 53. The vacuum pump 51 is connected to an external deodorization system to extract exhaust gas and transport it to the system, reducing odor emissions. The vacuum pump 51 can be a water ring vacuum pump, characterized by high vacuum and stable operation. The condensate tank 52 is connected to the vacuum pump 51 and is used to buffer the condensate drained from the exhaust gas. The bottom of the condensate tank 52 is connected to an external wastewater system to discharge the condensate. Vacuum pump 51 is connected in sequence to first buffer device 12, second buffer device 13, third buffer device 32, fourth buffer device 33 and dryer 20 through condensate tank 52 and waste heat recovery heat exchanger 53, so as to realize the separate vacuuming of first buffer device 12, second buffer device 13, third buffer device 32, fourth buffer device 33 and dryer 20. In addition, electric control valves (first electric control valve 60, second electric control valve 70, third electric control valve 80 and fourth electric control valve 90) are installed on the pipelines connecting each buffer device, so as to further realize the precise control of vacuuming.

[0048] In addition, in this embodiment, if the exhaust gas temperature is still higher than the receiving temperature limit of the deodorization system after the exhaust gas passes through the waste heat recovery heat exchanger 53 for heat exchange and condensation, a cooling heat exchanger 100 can be added between the waste heat recovery heat exchanger 53 and the condensate tank 52. The cooling heat exchanger 100 is provided with an external cooling water inlet and a return water outlet. The exhaust gas is further cooled by the external cooling water to meet the emission requirements.

[0049] The implementation principle of this embodiment is as follows: Through the rational arrangement of the material input mechanism 10 and the material output mechanism 30, continuous conveying of sludge material is achieved, improving production efficiency. The heat pump mechanism 40 utilizes the waste heat recovery heat exchanger 53 to recover waste heat from the system, reducing energy consumption and improving energy utilization efficiency. The vacuum mechanism 50 reduces odor and dust emissions, improving the system's environmental friendliness. The coordination of various buffer devices, electrically controlled valves, and electrically controlled sealing valves ensures stable system operation and sealed material conveying.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-temperature vacuum drying system with continuous feed and discharge, characterized in that, include: The material input mechanism (10) includes a feeding component (11), a first buffer device (12), a second buffer device (13), and a first discharge component (14). The feeding component (11) is connected to one end of the first buffer device (12) and the second buffer device (13), and the first discharge component (14) is connected to the other end of the first buffer device (12) and the second buffer device (13). The dryer (20) is connected to the first discharge component (14) and is used to receive the sludge material conveyed by the first discharge component (14) and dry it for output. The material output mechanism (30) includes a material distribution component (31), a third buffer device (32), a fourth buffer device (33), and a second discharge component (34). The material distribution component (31) is connected to one end of the dryer (20), the third buffer device (32), and the fourth buffer device (33), and the second discharge component (34) is connected to the other end of the third buffer device (32) and the fourth buffer device (33). The heat pump mechanism (40) includes a hot water circulation assembly (41) and a cold water circulation assembly (42), wherein the hot water circulation assembly (41) is connected to the dryer (20) and the cold water circulation assembly (42). The vacuum mechanism (50) is connected to the cold water circulation assembly (42), the first buffer device (12), the second buffer device (13), the third buffer device (32), the fourth buffer device (33), and the dryer (20).

2. The low-temperature vacuum drying system with continuous feeding and discharging according to claim 1, characterized in that, The first buffer device (12) is provided with a first electrically controlled sealing valve (121) at its upper end, and a second electrically controlled sealing valve (122) at its lower end. The first buffer device (12) is provided with a first pressure detector. The upper end of the second buffer device (13) is provided with a third electrically controlled sealing valve (131), the lower end of the second buffer device (13) is provided with a fourth electrically controlled sealing valve (132), and the second buffer device (13) is provided with a second pressure detector; The upper end of the third buffer device (32) is provided with a fifth electrically controlled sealing valve (321), the lower end of the third buffer device (32) is provided with a sixth electrically controlled sealing valve (322), and the third buffer device (32) is provided with a third pressure detector. The upper end of the fourth buffer device (33) is provided with a seventh electrically controlled sealing valve (331), the lower end of the fourth buffer device (33) is provided with an eighth electrically controlled sealing valve (332), and the fourth pressure detector is provided on the fourth buffer device (33).

3. The low-temperature vacuum drying system with continuous feeding and discharging according to claim 1, characterized in that, Also includes: A first electrically controlled valve (60) is connected between the vacuum mechanism (50) and the first buffer device (12); The second electrically controlled valve (70) is connected between the vacuum mechanism (50) and the second buffer device (13); The third electrically controlled valve (80) is connected between the vacuum mechanism (50) and the third buffer device (32); The fourth electrically controlled valve (90) is connected between the vacuum mechanism (50) and the fourth buffer device (33).

4. The low-temperature vacuum drying system with continuous feeding and discharging according to claim 3, characterized in that, The vacuum mechanism (50) includes: A vacuum pump (51) is connected to an external deodorization system and is used to extract the exhaust gas and deliver it to the deodorization system. A condensate tank (52), connected to the vacuum pump (51), is used to buffer the condensate discharged from the exhaust gas; Waste heat recovery heat exchanger (53) is connected to the condensate tank (52), the first buffer device (12), the second buffer device (13), the third buffer device (32), the fourth buffer device (33) and the dryer (20).

5. The low-temperature vacuum drying system with continuous feeding and discharging according to claim 4, characterized in that, The hot water circulation assembly (41) includes: a water source heat pump (411), a first water pump (412), and a hot water tank (413). The two ends of the water source heat pump (411) are the evaporation end and the condensation end, respectively. The return water port of the dryer (20) is connected to the inlet of the hot water tank (413) via a water pipe. The outlet of the hot water tank (413) is connected to the inlet of the first water pump (412) via a water pipe. The outlet of the first water pump (412) is connected to the inlet of the dryer (20) via a water pipe passing through the evaporation end of the water source heat pump (411) to form a hot water circulation. The outlet of the waste heat recovery heat exchanger (53) is connected to the cold water circulation assembly (42) via a water pipe, and the return water of the waste heat recovery heat exchanger (53) is connected to the condenser end of the water source heat pump (411) via a water pipe to form a cold water circulation.

6. The low-temperature vacuum drying system with continuous feeding and discharging according to claim 5, characterized in that, The cold water circulation assembly (42) includes a cold water tank (421) and a second water pump (422). The outlet of the waste heat recovery heat exchanger (53) is connected to the inlet of the cold water tank (421) via a water pipe. The outlet of the cold water tank (421) is connected to the inlet of the second water pump (422) via a water pipe. The outlet of the second water pump (422) is connected to the return port of the water source heat pump (411) via a water pipe passing through the condenser end of the water source heat pump (411) to form a cold water circulation.

7. The low-temperature vacuum drying system with continuous feeding and discharging according to claim 6, characterized in that, The vacuum mechanism (50) further includes: A cooling heat exchanger (100) is connected between the condensate tank (52) and the waste heat recovery heat exchanger (53), and is provided with an external cooling water inlet and a return water outlet; wherein an outlet of the waste heat recovery heat exchanger (53) is connected to the cold water tank (421).

8. The low-temperature vacuum drying system with continuous feeding and discharging according to claim 4, characterized in that, The bottom of the condensate tank (52) is connected to a sewage system to output condensate.

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