Belt type vacuum pulsation drying device

Abstract

The embodiment of the present invention provides a belt-type vacuum pulsation drying device, including a belt-type vacuum dryer, a steam compressor unit, a high-temperature heat pump unit and a vacuum unit; a heating zone is provided in the belt-type vacuum dryer, the outlet of the belt-type vacuum dryer is connected to the first outlet of the four-way reversing valve, the second outlet and the third outlet of the four-way reversing valve are respectively connected to the high-temperature heat pump unit and the steam compressor unit, and the high-temperature heat pump unit is connected to the vacuum unit; it also includes a hot water circulation system, including a heat source hot water tank, the steam compressor unit and the high-temperature heat pump unit are connected to the heat source hot water tank away from the side of the four-way reversing valve, and the outlet of the heat source hot water tank is connected to the heating zone. Through the above method, vacuum pressure pulsation and periodic circulation in the belt-type vacuum dryer with different operating methods can be realized, thereby adapting to different drying rates of different materials, and improving the utilization rate of energy in the drying system, greatly reducing energy consumption and operating costs.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, in particular to a belt-type vacuum pulsation drying device. Background Art

[0002] Belt vacuum dryers are widely used, primarily in the food, pharmaceutical, cosmetics, and chemical industries. While belt vacuum drying can preserve the active ingredients and quality of heat-sensitive or easily oxidized materials, some solid materials can suffer thermal damage from prolonged drying under continuous vacuum conditions. Furthermore, some liquid materials can form films and clumps on their surfaces under continuous vacuum conditions, affecting the drying rate. Consequently, current belt vacuum dryers are not adaptable to drying diverse materials. Summary of the Invention

[0003] The embodiment of the present invention provides a belt-type vacuum pulsation drying device, which is used to solve the technical problem that the belt-type vacuum dryer in the prior art cannot adapt to the drying of different materials.

[0004] The embodiment of the present invention provides a belt-type vacuum pulsation drying device, comprising: a belt-type vacuum dryer, a steam compressor unit, a high-temperature heat pump unit, and a vacuum unit;

[0005] The belt vacuum dryer is provided with a heating zone, the outlet of the belt vacuum dryer is connected to the first outlet of the four-way reversing valve, the second outlet and the third outlet of the four-way reversing valve are respectively connected to the high-temperature heat pump unit and the steam compressor unit, and the high-temperature heat pump unit is connected to the vacuum unit;

[0006] It also includes a hot water circulation system, including a heat source hot water tank. The steam compressor unit and the high-temperature heat pump unit are connected to the heat source hot water tank on the side away from the four-way reversing valve, and the outlet of the heat source hot water tank is connected to the heating area.

[0007] According to an embodiment of the present invention, the belt-type vacuum pulsation drying device comprises a high-temperature heat pump unit including a working fluid evaporator connected to the second outlet of the four-way reversing valve, a working fluid compressor connected to the working fluid evaporator, and a working fluid condenser connected to the working fluid compressor;

[0008] The working medium condenser is located in the heat source hot water tank, and the outlet of the working medium evaporator is connected to the inlet of the vacuum unit.

[0009] According to an embodiment of the present invention, the belt-type vacuum pulsation drying device further includes a throttle valve, and both ends of the throttle valve are respectively connected to the working medium condenser and the working medium evaporator.

[0010] According to an embodiment of the present invention, the belt-type vacuum pulsation drying device comprises a steam compressor unit including a three-phase separator connected to the third outlet of the four-way reversing valve, a steam compressor connected to the three-phase separator, a steam condenser connected to the steam compressor, and a condensed water tank connected to the steam condenser.

[0011] The steam condenser is located in the heat source hot water tank.

[0012] According to the belt-type vacuum pulsation drying device of one embodiment of the present invention, the heat source hot water tank further includes a supplementary heater for heating the water in the heat source hot water tank.

[0013] According to one embodiment of the present invention, a belt-type vacuum pulsating drying device is provided in the belt-type vacuum dryer. The heating zone includes a first heating zone, a second heating zone, and a third heating zone arranged in sequence along the conveying direction of the conveyor belt mechanism. A high-temperature hot water delivery pipe is connected below the first heating zone, and a heating valve is provided on the high-temperature hot water delivery pipe.

[0014] The hot water circulation system is communicated with the second heating zone and the third heater respectively.

[0015] According to an embodiment of the present invention, the belt-type vacuum pulsation drying device comprises a first pipe body, a hot water circulation pump provided on the first pipe body, a first three-way valve and a second three-way valve;

[0016] The invention also includes a second pipe and a feedback pipe, wherein the feedback pipe is respectively connected to the first outlet of the first three-way valve, the second heating zone, and the first outlet of the second three-way valve; and the second pipe is connected to the second outlet of the first three-way valve, the third heating zone, and the second outlet of the second three-way valve.

[0017] The third outlet of the first three-way valve is connected to the first pipe body, and the third outlet of the second three-way valve is connected to the heat source hot water tank.

[0018] According to a belt-type vacuum pulsation drying device according to one embodiment of the present invention, the conveyor belt mechanism is further provided with a cooling zone on a side close to the third heating zone, and the conveyor belt mechanism is correspondingly provided with a first heating plate, a second heating plate, a third heating plate and a cooling plate in the first heating zone, the second heating zone, the third heating zone and the cooling zone, a cold water delivery pipe is connected below the cooling plate, and a cold water valve is provided on the cold water delivery pipe.

[0019] According to an embodiment of the belt vacuum pulsation drying device of the present invention, the fourth outlet of the four-way reversing valve is connected to the outside world, and the pressure value in the belt vacuum dryer can be adjusted by adjusting the opening of the fourth outlet of the four-way reversing valve.

[0020] According to the belt-type vacuum pulsating drying device of one embodiment of the present invention, a filter is provided between the belt-type vacuum dryer and the four-way reversing valve, and the filter is used to filter impurities carried in the water vapor.

[0021] The belt-type vacuum pulsating drying device provided in an embodiment of the present invention includes a steam compressor unit, a high-temperature heat pump unit, and a vacuum unit. When the system needs to maintain operation in a low-pressure area, the steam compressor unit or the high-temperature heat pump unit can be turned on and the operating frequency can be gradually increased to ensure that the system operates in the low-pressure area. When the system needs to maintain operation in a high-pressure area, the steam compressor or the high-temperature heat pump unit can be turned off or the operating frequency can be reduced to ensure that the system operates in the high-pressure area. Through these two different operating modes, the high and low pressure cycles of the vacuum degree in the belt vacuum dryer can be achieved, thereby adapting to the processing requirements of different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of an embodiment of a belt-type vacuum pulsation drying device of the present invention;

[0024] Figure 2 for Figure 1 A partial structural diagram of a belt-type vacuum pulsation drying device in one state is shown;

[0025] Figure 3 for Figure 1 The diagram shows a partial structure of the belt-type vacuum pulsation drying device in another state.

[0026] Reference numerals:

[0027] 10. Belt vacuum dryer; 120. Four-way reversing valve; 130. Heating zone; 1310. First heating zone; 1320. Second heating zone; 1330. Third heating zone; 1340. High-temperature hot water delivery pipe; 1350. Heating valve; 1360. Cooling zone; 140. Conveyor belt mechanism; 150. First heating plate; 160. Second heating plate; 170. Third heating plate; 180. Cooling plate; 1810. Cold water delivery pipe; 1820. Cold water valve;

[0028] 20. Steam compressor unit; 210. Three-phase separator; 220. Steam compressor; 230. Steam condenser; 240. Condensate tank;

[0029] 30. High-temperature heat pump unit; 310. Working fluid evaporator; 320. Working fluid compressor; 330. Working fluid condenser; 340. Throttle valve;

[0030] 40. Vacuum unit;

[0031] 50. Hot water circulation system; 510. Heat source hot water tank; 520. Heater; 530. First pipe; 540. Hot water circulation pump; 550. Second pipe; 560. Feedback pipe; 570. First three-way valve; 580. Second three-way valve;

[0032] 60. Filter. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] Please refer to Figure 1 , Figure 1It is a structural diagram of an embodiment of a belt-type vacuum pulsating drying device of the present invention. The present invention provides a belt-type vacuum pulsating drying device, comprising: a belt-type vacuum dryer 10, a steam compressor unit 20, a high-temperature heat pump unit 30 and a vacuum unit 40. A heating zone 130 is provided in the belt-type vacuum dryer 10. The outlet of the belt-type vacuum dryer 10 is connected to the first outlet of the four-way reversing valve 120. The second outlet and the third outlet of the four-way reversing valve 120 are respectively connected to the high-temperature heat pump unit 30 and the steam compressor unit 20. The high-temperature heat pump unit 30 is connected to the vacuum unit 40. In addition, it also includes a hot water circulation system 50. The hot water circulation system 50 includes a heat source hot water tank 510. The steam compressor unit 20 and the high-temperature heat pump unit 30 are connected to the heat source hot water tank 510 on the side away from the four-way reversing valve 120. The outlet of the heat source hot water tank 510 is connected to the heating zone 130. It is understood that, please refer to Figure 2 and Figure 3 , Figure 2 for Figure 1 A partial structural diagram of a belt-type vacuum pulsation drying device in one state is shown; Figure 3 for Figure 1 A partial structural diagram of a belt-type vacuum pulsation drying device in another state is shown. The belt-type vacuum pulsation drying device has two operating modes. The first consists of a belt-type vacuum dryer 10, a high-temperature heat pump unit 30, a vacuum unit 40, and a hot water circulation system 50. The second consists of a belt-type vacuum dryer 10, a steam compressor unit 20, and a hot water circulation system 50.

[0036] In the first operating mode, the high-temperature heat pump unit 30 includes a working fluid evaporator 310 connected to the second outlet of the four-way reversing valve 120, a working fluid compressor 320 connected to the working fluid evaporator 310, and a working fluid condenser 330 connected to the working fluid compressor 320. The working fluid condenser 330 is located within the heat source hot water tank 510, and the outlet of the working fluid evaporator 310 is connected to the inlet of the vacuum unit 40. The unit also includes a throttle valve 340, with both ends of the throttle valve 340 connected to the working fluid condenser 330 and the working fluid evaporator 310, respectively.

[0037] The second operation mode is as follows: the steam compressor unit 20 includes a three-phase separator 210 connected to the third outlet of the four-way reversing valve 120, a steam compressor 220 connected to the three-phase separator 210, a steam condenser 230 connected to the steam compressor 220, and a condensed water tank 240 connected to the steam condenser 230. Furthermore, the steam condenser 230 is located in the heat source hot water tank 510.

[0038] In addition, the heat source hot water tank 510 further includes a supplementary heater 520 for heating the water in the heat source hot water tank 510 .

[0039] The belt vacuum dryer 10 is equipped with a conveyor belt mechanism 140. The heating zone 130 includes a first heating zone 1310, a second heating zone 1320, and a third heating zone 1330 arranged in sequence along the conveyor belt mechanism 140. A high-temperature hot water delivery pipe 1340 is connected below the first heating zone 1310. This pipe is equipped with a heating valve 1350. The hot water circulation system 50 is connected to the second heating zone 1320 and the third heating zone 1330, respectively. The high-temperature hot water delivery pipe 1340 delivers a high-temperature fluid, which can be hot water or saturated steam. The high-temperature fluid enters the first heating plate 150, where it is heated, thereby drying the material above the first heating plate 150. The first heating plate 150 is used to provide heat to heat the material.

[0040] The hot water circulation system 50 includes a first pipe 530, a hot water circulation pump 540 disposed on the first pipe 530, a first three-way valve 570, and a second three-way valve 580. The system also includes a second pipe 550 and a feedback pipe 560. The feedback pipe 560 is connected to the first outlet of the first three-way valve 570, the second heating zone 1320, and the first outlet of the second three-way valve 580, respectively. The second pipe 550 is connected to the second outlet of the first three-way valve 570, the third heating zone 1330, and the second outlet of the second three-way valve 580. The third outlet of the first three-way valve 570 is connected to the first pipe 530, and the third outlet of the second three-way valve 580 is connected to the heat source hot water tank 510. It is understood that the system also includes a fourth pipe 590, one end of which is connected to the second three-way valve 580 and the other end is connected to the heat source hot water tank 510. In this arrangement, the first tube body 530 and the fourth tube body 590 connected to the heat source hot water tank 510, and the second tube body 550 and the feedback tube 560 connected to the first tube body 530 can form a heat cycle, thereby ensuring that the heat generated by the hot water is always in a circulating state, which can greatly reduce the consumption of the heat source and thereby improve the utilization rate of energy.

[0041] The conveyor mechanism 140 also includes a cooling zone 1360 near the third heating zone 1330. The conveyor mechanism 140 is equipped with a first heating plate 150, a second heating plate 160, a third heating plate 170, and a cooling plate 180 in the first heating zone 1310, the second heating zone 1320, the third heating zone 1330, and the cooling zone 1360, respectively. A cold water delivery pipe 1810 is connected below the cooling plate 180, and a cold water valve 1820 is installed on the cold water delivery pipe 1810. The material is heated and dried in the first heating zone 1310, the second heating zone 1320, and the third heating zone 1330, respectively, and then cooled in the cooling zone 1360.

[0042] Please continue to refer to Figure 1 and Figure 2 , for the first operation mode, as follows:

[0043] During operation of the belt vacuum pulsation drying device, moisture from the material within the belt vacuum dryer 10 evaporates at low temperatures under a vacuum environment. The first drying method corresponds to a cyclical drying pressure within the belt vacuum dryer 10, with a low pressure of 1-15 kPa and a high pressure of 40-80 kPa. It is understood that a cyclical pulsation drying method with a low pressure of 1-15 kPa and a high pressure of 40-80 kPa is preferred. This is particularly useful when the pressure within the belt vacuum dryer 10 needs to be maintained at a low level, for example, 10 kPa. At this time, the vacuum unit 40 and the high-temperature heat pump unit 30 need to be turned on. The low-temperature water vapor passes through the working fluid evaporator 310 and transfers heat to the refrigerant in the high-temperature heat pump unit 30, and is then extracted by the vacuum unit 40. The refrigerant is compressed and enthalpy increased by the working fluid compressor 320, and then enters the working fluid condenser 330 and transfers heat to the hot water in the heat source hot water tank 510; if the pressure in the belt vacuum dryer 10 needs to be maintained at a high pressure state, for example: 50KPa, the vacuum unit 40 and the high-temperature heat pump unit 30 need to be turned off to prevent water vapor from escaping from the belt vacuum dryer 10 until the pressure reaches the high-pressure state value range, such as 50KPa. In this way, the pressure in the belt vacuum dryer 10 will become lower and lower as the vacuum unit 40 operates, and then it can reach the low-pressure operating range. When the pressure in the belt vacuum dryer 10 reaches a specific value requirement in the low-pressure range, for example, when it reaches 10KPa, the second outlet opening of the four-way reversing valve 120 can be adjusted to maintain the low-pressure value in the belt dryer, so that the low-pressure in the belt vacuum dryer 10 is in a stable state; when the low-pressure in the belt vacuum dryer 10 runs stably for a specified time, the second outlet of the four-way reversing valve 120 is closed, and the vacuum As moisture from the material evaporates into the belt vacuum dryer 10 during the drying process, the pressure within the belt vacuum dryer 10 gradually increases. When the pressure within the belt vacuum dryer 10 reaches a specific pressure value within the desired high-pressure range, the pressure can be regulated by adjusting the opening of the second outlet of the four-way reversing valve 120. This adjusts the amount of water vapor discharged to maintain the pressure within the belt vacuum dryer 10 constant within the specified high-pressure range, i.e., within the range of 40-80 kPa. When the temperature of the circulating hot water falls below the set heat source temperature, the supplementary heater 520 within the heat source hot water tank 510 can be activated to heat the circulating hot water. When the system operates within the high-pressure range for a specified time, the second outlet of the four-way reversing valve 120, the high-temperature heat pump unit 30, and the vacuum unit 40 are opened and regulated to reduce the pressure within the belt vacuum dryer 10. It should be noted that the working time of the low-pressure zone is preferably 0.5-30 minutes, and the working time of the high-pressure zone is also preferably 0.5-30 minutes, and this cycle is repeated.In one embodiment of the present invention, the circulating fluid in the high-temperature heat pump unit 30 can be R134a or carbon dioxide. That is, when the heat source water circulation temperature is required to be lower than 70 degrees Celsius, R134a can be used as the working fluid; when the heat source water circulation temperature is required to be 70-100 degrees Celsius, carbon dioxide can be used as the working fluid; when the heat source hot water temperature is required to be higher than 100 degrees Celsius, steam compressor 220 can be used, which is the second operating mode described below. Different materials require different heating temperatures, and thus can be adapted to different circulating working fluids. For example, if a material is suitable for heating at 80 degrees Celsius, exceeding 80 degrees Celsius may cause thermal damage to the material. In this case, carbon dioxide can be used as the circulating working fluid, and the heat source circulating water temperature can be stabilized at around 80 degrees Celsius.

[0044] The second operating mode is as follows: the drying pressure within the belt vacuum dryer 10 cycles between a low pressure of 10-40 kPa and a high pressure of 70-120 kPa. Preferably, the low pressure is 10-40 kPa and the high pressure is 70-120 kPa. It will be appreciated that within the belt vacuum dryer 10, moisture from the material evaporates at low temperatures under the vacuum environment. The evaporated water vapor is relatively low in temperature and then passes through the filter 60 located between the belt vacuum dryer 10 and the four-way reversing valve 120 before entering the steam compressor unit 20. When the belt vacuum dryer 10 is in a high pressure state, for example, 100 kPa, and needs to be switched to a low pressure after the high pressure is maintained for a specified time, the steam compressor unit 20 can be turned on, that is, the third outlet of the four-way reversing valve 120 is opened. After the low-temperature water vapor passes through the three-phase separator 210 to separate the small droplets, the remaining low-temperature water vapor enters the steam compressor 220. The low-temperature water vapor is compressed to increase the enthalpy and becomes high-temperature water vapor. Then the high-temperature water vapor enters the steam condenser 230. The high-temperature water vapor transfers heat to the hot water in the steam condenser 230 in the steam condenser 230. At this time, the temperature of the hot water is higher than the saturation temperature corresponding to the high pressure value. In this embodiment, the saturation temperature corresponds to 100 kPa, which is about 100 degrees. The water vapor cools down and condenses into liquid and enters the condensed water tank 240 for storage. In this way, the pressure in the belt vacuum dryer 10 will change from high pressure to low pressure. When the pressure within the belt vacuum dryer 10 reaches a specific value within the low-pressure range, the opening of the third outlet of the four-way reversing valve 120 is adjusted to stabilize the pressure within the belt vacuum dryer 10. When the system has been operating stably at low pressure for a specified period of time, the third outlet of the four-way reversing valve 120 and the steam compressor 220 can be closed. As moisture from the material evaporates into the belt vacuum dryer 10 during the drying process, the pressure within the belt vacuum dryer 10 gradually increases. Furthermore, when the pressure within the belt vacuum dryer 10 reaches a specific value within the desired high-pressure range, the opening of the third outlet of the four-way reversing valve 120 can be adjusted. This means that the amount of water vapor discharged can be adjusted to maintain the pressure within the belt vacuum dryer 10 constant within the specified high-pressure range. When the circulating hot water temperature falls below the set heat source temperature, the supplementary heater 520 in the hot water tank can be activated to heat the water in the heat source hot water tank 510. When the system runs at a specific high pressure value for a specified time, the steam compressor unit 20 is turned on to reduce the pressure in the belt vacuum dryer 10 to a low pressure. In one embodiment of the present invention, the working time of the low pressure zone and the working time of the high pressure zone are preferably 0.5-30 minutes, and this cycle is used to achieve pressure cyclic pulsation.

[0045] In one embodiment of the present invention, the steam evaporation rate during the material drying process is 80 kg / h, the steam consumption in the belt vacuum dryer 10 is 75 kg / h, and the system power consumption is 29 KW·H / h. The size of the belt vacuum dryer 10 is Φ550×2500 mm, and the material spreading area in the belt vacuum dryer 10 is 0.6 m 2 The length and width of the crawler belt in the conveyor belt mechanism 140 are 30m and 1.2m respectively. The heating area is 140m 2 The crawler running speed is 0.5-1.0m / min, the crawler driving power is 0.14KW, and the crawler material can be glass fiber belt or polytetrafluororesin coating. The crawler conveying can be controlled by the PLC controller, and it can also be connected to the electric control cabinet and touch control panel for monitoring. The three-phase separator 210 can be a vertical spray type, the wire mesh thickness is 50mm, the insulation layer thickness is 50mm, and the size is Φ500×2500mm. The nominal diameters of the filter 60, the four-way reversing valve 120, and the first three-way reversing valve and the second three-way reversing valve are all 200mm. The displacement of the steam compressor 220 is 56m3 / min, the compressor temperature rise is 30-70 degrees Celsius, and the distribution power is 45KW. The condensate tank 240 is horizontal, with a size of Φ500x1500mm, and the oil pump flow of the steam compressor 220 is 1.5m 3 / h, with a power of 1.5 kW. The dimensions of the heat source hot water tank 510 are Φ1000 x 3000 mm, and the temperature of the first heating plate 150 is 100-150 degrees Celsius. The working fluid in the high-temperature heat pump unit 30 can be R123a, CO2, or R245fa. In the vacuum unit 40, when the pressure is ≤10 kPa, a combination of a water ring and Roots pump can be used; when the pressure is greater than 10 kPa, a water ring vacuum pump can be used.

[0046] An embodiment of the present invention further provides a belt vacuum pulsating drying method with alternating normal pressure and vacuum, which is achieved by connecting the fourth outlet of the four-way reversing valve 120 to the outside world. When the belt vacuum dryer 10 is in a low-pressure operating state and has been running for a specified time, the fourth outlet of the four-way reversing valve 120 can be opened to allow external air to quickly enter the belt vacuum dryer 10 and increase the pressure in the belt vacuum dryer 10 to normal pressure. Then, the high-temperature heat pump unit 30 is turned on, and the steam compressor unit 20 and the vacuum unit 40 are turned off to maintain the pressure in the belt vacuum dryer 10 at normal pressure and remove moisture from the humid air in the belt dryer 10. When the pressure of the belt vacuum dryer 10 is running at normal pressure for a specified time, the vacuum unit 40 can be turned on to reduce the pressure in the belt vacuum dryer 10 to a low-pressure state. Preferably, the low-pressure range is 1-70KPa. After the belt vacuum dryer 10 has been operating at low pressure for a predetermined period of time, the above steps are repeated, corresponding to the pulsating cycle of normal pressure and vacuum in the belt vacuum dryer 10. This allows for a cyclical pulsating cycle of normal pressure and vacuum between 1 kPa and 70 kPa in the belt vacuum dryer 10.

[0047] The belt vacuum pulsating drying device provided by the present invention can improve the drying rate of the belt vacuum dryer 10 and ensure the drying quality of different materials. At the same time, it can be used in different operating modes, for example, by using the compression enthalpy increase of the steam compressor unit 20 or the energy level increase of the high-temperature heat pump unit 30 to supply heat to the heat source hot water tank 510 to form a hot water circulation system 50, recover the waste heat of the secondary steam in the vacuum dryer 10, reduce energy loss, and improve energy utilization.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A belt type vacuum pulsation drying device, characterized in that: Including belt vacuum dryer, steam compressor unit, high temperature heat pump unit, vacuum unit and hot water circulation system; The belt vacuum dryer is provided with a heating zone, the outlet of the belt vacuum dryer is connected to the first outlet of the four-way reversing valve, the second outlet and the third outlet of the four-way reversing valve are respectively connected to the high-temperature heat pump unit and the steam compressor unit, and the high-temperature heat pump unit is connected to the vacuum unit; The hot water circulation system comprises a heat source hot water tank, the steam compressor unit and the high temperature heat pump unit are connected to the heat source hot water tank at a side away from the four-way reversing valve, and the outlet of the heat source hot water tank is connected to the heating area; The high-temperature heat pump unit comprises a working fluid evaporator connected to the second outlet of the four-way reversing valve, a working fluid compressor connected to the working fluid evaporator, and a working fluid condenser connected to the working fluid compressor; the working fluid condenser is located in the heat source hot water tank, and the outlet of the working fluid evaporator is connected to the inlet of the vacuum unit; The steam compressor unit comprises a three-phase separator connected to the third outlet of the four-way reversing valve, a steam compressor connected to the three-phase separator, a steam condenser connected to the steam compressor, and a condensed water tank connected to the steam condenser; the steam condenser is located in the heat source hot water tank; The belt vacuum dryer is provided with a conveyor belt mechanism, the heating zone includes a first heating zone, a second heating zone and a third heating zone arranged in sequence along the conveying direction of the conveyor belt mechanism, a high-temperature hot water delivery pipe is connected below the first heating zone, and a heating valve is provided on the high-temperature hot water delivery pipe; the hot water circulation system is respectively connected with the second heating zone and the third heating zone; The hot water circulation system includes a first pipe body, a hot water circulation pump arranged on the first pipe body, a first three-way valve and a second three-way valve; it also includes a second pipe body and a feedback pipe, the feedback pipe is respectively connected with the first outlet of the first three-way valve, the second heating zone and the first outlet of the second three-way valve, the second pipe body is connected with the second outlet of the first three-way valve, the third heating zone and the second outlet of the second three-way valve; the third outlet of the first three-way valve is connected with the first pipe body, and the third outlet of the second three-way valve is connected with the heat source hot water tank; the conveyor belt mechanism is also provided with a cooling zone on the side close to the third heating zone, and the conveyor belt mechanism is correspondingly provided with a first heating plate, a second heating plate, a third heating plate and a cooling plate in the first heating zone, the second heating zone, the third heating zone and the cooling zone, a cold water delivery pipe is connected under the cooling plate, and a cold water valve is provided on the cold water delivery pipe.

2. The belt type vacuum pulsation drying device according to claim 1, characterized in that: It also includes a throttle valve, and two ends of the throttle valve are respectively connected to the working medium condenser and the working medium evaporator.

3. The belt type vacuum pulsation drying device according to claim 1, characterized in that: The heat source hot water tank also includes a supplementary heater for heating the water in the heat source hot water tank.

4. The belt type vacuum pulsation drying device according to claim 1, characterized in that: The fourth outlet of the four-way reversing valve is connected to the outside, and the pressure value in the belt vacuum dryer can be adjusted by adjusting the opening of the fourth outlet of the four-way reversing valve.

5. The belt type vacuum pulsation drying device according to claim 1, characterized in that: A filter is provided between the belt vacuum dryer and the four-way reversing valve, and the filter is used to filter impurities carried in the water vapor.

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