Heat pump low-temperature continuous evaporation drying device

Abstract

The invention discloses a heat pump low-temperature continuous evaporation drying device which comprises an equipment box, and a distillation assembly, a heat pump evaporation assembly and a roller scraper dryer which are arranged in the equipment box, the distillation assembly is used for carrying out distillation treatment on the biogas slurry; the heat pump evaporation assembly is used for performing low-temperature evaporation treatment on the distilled biogas slurry, so that the biogas slurry is further concentrated; the roller scraper drying device is used for drying and separating solid substances in the biogas slurry concentrated solution; the device is reasonable in structural design, the biogas slurry is subjected to low-temperature evaporation treatment, so that the cost of a production enterprise during biogas slurry treatment can be greatly reduced, meanwhile, the loss of heat-sensitive components in the biogas slurry is reduced, and a technical support is provided for recycling and high-value treatment of the biogas slurry; meanwhile, the equipment is small in occupied area, convenient to move and high in automation degree, an external steam source and peripheral cooling water are not needed, only electric energy and a small amount of compressed air need to be provided, the operation energy consumption of the device is effectively reduced, and good engineering application prospects are achieved.

Description

Technical Field

[0001] This invention relates to the field of livestock and poultry manure treatment technology, specifically to a heat pump low-temperature continuous evaporation drying device. Background Technology

[0002] Anaerobic digestion is an important technology for the resource utilization of agricultural waste. Obtaining clean energy while treating waste is of great significance for alleviating the energy crisis and controlling environmental pollution. Ammonia nitrogen is a significant nitrogen source in biogas slurry (accounting for approximately 90% of the total nitrogen). If high-temperature evaporation leads to a large-scale volatilization of free ammonia, it not only wastes nitrogen resources but may also cause secondary pollution (NH3 is a precursor to PM2.5 and ozone). Low-temperature evaporation suppresses NH4+. + The conversion to NH3 allows ammonia nitrogen to be retained in the concentrate in liquid or solid form, facilitating efficient recovery through adsorption, ion exchange, or chemical precipitation to produce nitrogen fertilizer or feed additives, significantly improving resource utilization. However, with the promotion of anaerobic digestion technology for livestock and poultry manure, the amount of anaerobic fermentation biogas slurry produced is increasing, and the safe disposal of biogas slurry has become a problem that must be addressed in the prevention and control of agricultural waste pollution in my country. In order to reduce the transportation cost of biogas slurry and increase the percentage of nutrients in it, it is necessary to perform low-temperature evaporation and concentration treatment. After low-temperature evaporation and concentration, the concentrated water needs to be further evaporated and dried to produce dry powder.

[0003] In the field of biogas slurry concentration treatment, the main technology focuses on negative pressure evaporation, which can achieve a concentration rate of 90% and a nitrogen and phosphorus concentration in the concentrate that is more than 10 times that of the original liquid. However, the equipment occupies a large area, and the loss of ammonia nitrogen with water is also significant. Moreover, the existing biogas slurry concentration equipment has limitations to varying degrees, and the resource recovery and volume reduction are not thorough. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a heat pump low-temperature continuous evaporation and drying device.

[0005] The technical solution of the present invention is as follows: a heat pump low-temperature continuous evaporation and drying device, including an equipment box and a distillation component, a heat pump evaporation component, and a drum scraper dryer disposed inside the equipment box; a door is movably hinged to the front end of the box, and a partition is disposed inside the box; The distillation assembly includes a distillation vessel located at the bottom of the equipment box, a heat exchange coil coiled inside the distillation vessel, a stirrer rotatably clamped inside the distillation vessel, and a stirring motor located at the top of the distillation vessel and providing power to the stirrer; a water inlet pipe penetrating the equipment box is provided at the upper end of the outer wall of the distillation vessel, a steam exhaust pipe penetrating the baffle is provided at the top of the distillation vessel, and a concentrated water exhaust pipe is provided at the lower end of the outer wall of the distillation vessel. The heat pump evaporation assembly is located on the upper surface of the partition. The assembly includes a heat pump evaporator and a compressor and condenser connected to the evaporator. The evaporator includes an outer shell and several evaporation plates equidistantly distributed inside the shell. A condensate drain pipe penetrating the equipment box is located at the lower end of the outer wall of the outer shell, and a steam drain pipe communicates with the interior of the shell. The evaporation plates are hollow, and they are connected by interconnecting pipes. The interconnecting pipes on adjacent evaporation plates are staggered. A refrigerant injection pipe and a refrigerant circulation pipe penetrating the shell are respectively located on the left and right ends of the evaporation plates inside the shell. One end of the compressor is connected to the refrigerant circulation pipe, and the other end is connected to one port of the heat exchange coil. One end of the condenser is connected to the other port of the heat exchange coil, and the other end of the condenser is connected to the refrigerant injection pipe via a three-way valve. An expansion valve is installed at the connection point; flow monitoring instruments are installed at the connection points between the condenser and the heat exchange coil, and between the condenser and the refrigerant dosing pipe; the drum scraper dryer includes a material trough at the bottom of the equipment box, a rotating drum that is rotatably clamped inside the material trough by a bracket, a drum motor that is mounted on the bracket and provides power to the rotating drum, a scraper at the top of the material trough, and a discharge screw that is rotatably clamped inside the material trough and located outside the scraper; a concentrated water discharge pipe is connected to the material trough, and a feed pump is installed at the connection point; both ends of the rotating drum are respectively equipped with a connecting shaft that is rotatably clamped to the bracket and a hot steam injection pipe, and the output end of the drum motor is connected to the connecting shaft; a receiving cavity for accommodating the discharge screw is provided on one side of the material trough, a discharge motor that provides power to the discharge screw is provided on one side of the material trough, and a discharge pipe that is connected to the inside of the receiving cavity and runs through the equipment box is provided on the other side.

[0006] Furthermore, several air inlet boxes are evenly distributed on the inner side wall of the outer shell, and each air inlet box is provided with an air distribution nozzle on the side away from the inner side wall of the outer shell. An annular pipe is provided on the outer side wall of the outer shell, which is connected to each air inlet box. The steam exhaust pipe is connected to the annular pipe. Note: By setting an air inlet box on the inner side wall of the outer shell, it is beneficial to improve the uniformity of biogas vapor entering the interior of the outer shell, thereby improving the heat exchange effect between biogas vapor and condensate.

[0007] Furthermore, the refrigerant injection pipe is rotatably engaged with the evaporator plate at the corresponding position, the refrigerant circulation pipe is rotatably engaged with the compressor, a connecting gear is sleeved on the refrigerant circulation pipe, a micro motor is installed on the outer wall of the outer casing, and the output end of the micro motor is connected to a drive gear that meshes with the connecting gear. Explanation: During the heat exchange process between the condensate and the biogas slurry vapor, a micro motor drives the condensate circulation pipe to rotate, thereby causing each evaporation plate to rotate simultaneously inside the outer shell, further improving the contact efficiency between the biogas slurry vapor and the evaporation plate.

[0008] Furthermore, an inner cylinder is fitted inside the rotating drum, with one end of the inner cylinder closed and the other end of the inner cylinder fixedly connected to the inner wall of the rotating drum. Explanation: By setting an inner cylinder inside the rotating drum, hot steam can enter the cavity between the inner cylinder and the rotating drum to heat the inner wall of the rotating drum, thereby reducing the heat loss of the hot steam and helping to reduce the energy consumption of the device.

[0009] Furthermore, stirring rods are rotatably engaged on both sides of the bottom of the trough. The ends of the two stirring rods penetrate the trough and are connected to the first pulleys. A second pulley is sleeved on the connecting shaft. The second pulley is connected to the two first pulleys by belt drive. Explanation: The stirring rod continuously agitates the biogas slurry concentrate inside the trough, keeping the solids in the biogas slurry concentrate in a suspended state, thereby improving the uniformity of the solids in the biogas slurry concentrate on the surface of the rotating drum.

[0010] Furthermore, the scraper is slidably engaged with the trough via an adjusting seat. The adjusting seat is provided with a lever that penetrates the side wall of the trough and is slidably engaged with the trough. A U-shaped push frame connected to the lever is provided on the outer side wall of the trough. A first adjusting screw is threadedly connected to the U-shaped push frame and is rotatably engaged with the outer side wall of the trough. Explanation: The first adjusting screw drives the U-shaped pusher frame to move on the material trough, thereby enabling the adjusting seat to push the scraper away from or closer to the rotating drum under the action of the U-shaped pusher frame. This facilitates the adjustment of the distance between the scraper and the rotating drum according to the thickness of the liquid layer on the surface of the rotating drum.

[0011] Furthermore, the scraper is rotatably engaged with the adjusting seat via a movable shaft, the movable shaft passes through the adjusting seat, and an adjusting gear is connected to the end of the movable shaft. A movable rack that meshes with the adjusting gear is slidably engaged on the outer wall of the adjusting seat, and a second adjusting screw that is rotatably engaged with the movable rack is threaded on the outer wall of the adjusting seat. Explanation: The second adjusting screw drives the moving rack to move inside the adjusting seat. The meshing action of the moving rack and the spur gear can drive the scraper to deflect on the adjusting seat, thereby facilitating the adjustment of the scraping angle of the scraper.

[0012] Furthermore, a sealing cover located outside the rotating drum is rotatably snapped onto the upper end face of the material trough. Several arc-shaped guide grooves are evenly distributed on the inner wall of the sealing cover. Collection grooves that communicate with each arc-shaped guide groove are provided on both sides inside the sealing cover. A drain pipe that penetrates the sealing cover is connected to the collection groove. Explanation: By setting up a sealing cover, the heat loss inside the drum scraper dryer can be reduced. The arc-shaped guide groove and collection groove inside the sealing cover can quickly condense and liquefy the steam generated by the biogas concentrate inside the feed tank, further improving the drying effect of the biogas concentrate.

[0013] Furthermore, a lifting spiral is connected to the bottom of the stirrer; Note: During the rotation of the stirrer, the lifting screw can continuously lift the biogas slurry concentrate at the bottom of the distillation vessel, which is beneficial to improving the distillation efficiency of the biogas slurry.

[0014] Furthermore, an observation window is provided on the box door; Note: By setting up an observation window, it is convenient to conduct a thorough monitoring of the operating status of the device's components, thereby improving the device's operational safety.

[0015] The present invention also provides an application of a heat pump low-temperature continuous evaporation drying device, which is applied to the full-scale resource utilization treatment of manure and sewage based on the above-mentioned heat pump low-temperature continuous evaporation drying device.

[0016] The working principle of this invention is as follows: In operation, the biogas slurry after solid-liquid separation is introduced into the distillation kettle through the inlet pipe, and condenser is added into the evaporation pan through the condenser addition pipe. The condenser evaporates upon heating to form condenser gas. Under the action of the compressor, the condenser gas becomes high-temperature, high-pressure condenser gas and enters the heat exchange coil to heat the biogas slurry. The biogas slurry evaporates to produce hot steam, which enters the outer shell through the steam discharge pipe. During the evaporation of aquaculture wastewater, the stirring motor drives the stirrer to rotate and agitate the aquaculture wastewater. The hot steam entering the outer shell comes into contact with the evaporation pan, its temperature decreases, and condensate is formed. The condensate is discharged through the condensate discharge pipe. The high-temperature, high-pressure condenser gas decreases in pressure and temperature under the action of the condenser and expansion valve. The depressurized and cooled condenser enters the evaporation pan through the three-way valve for recycling. The concentrated water discharged from the distillation kettle enters the material tank through the concentrated water discharge pipe under the action of the feed pump. High-temperature gas is injected into the rotating drum through the hot steam injection pipe, which raises the temperature of the outer wall of the rotating drum. The drum motor drives the rotating drum to rotate. During the rotation of the rotating drum, the concentrated water is evenly coated on the surface of the rotating drum and is dried. The dried solid material enters the receiving cavity under the action of the scraper. The discharge motor drives the discharge screw to rotate, so that the solid material is discharged through the discharge pipe under the action of the discharge screw.

[0017] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects: First, this invention significantly reduces energy consumption and costs in the biogas slurry treatment process by treating biogas slurry through low-temperature evaporation. The device of this invention does not rely on an external steam source or cooling water; it only requires electricity and a small amount of compressed air to operate efficiently. At the same time, the equipment has a small footprint, is easy to move, and has a high degree of automation, significantly reducing the operating costs of production enterprises. Secondly, this invention uses a drum scraper dryer to dry the biogas slurry concentrate, which effectively improves the drying and separation of solid substances and avoids the loss of heat-sensitive active ingredients in the biogas slurry. This process not only improves the drying efficiency of the concentrate but also achieves the reduction, resource recovery, and high-value treatment of biogas slurry. In summary, by optimizing the device structure and processing flow, this invention not only significantly reduces the cost of biogas slurry treatment and improves energy utilization efficiency, but also effectively promotes the resource utilization, high-value utilization, and circular economy of biogas slurry, and has broad application prospects. Attached Figure Description

[0018] Figure 1 This is a longitudinal sectional view of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is the present invention. Figure 1 A magnified view of a portion of point A in the middle; Figure 4 This is a schematic diagram of the internal structure of the outer shell of the present invention; Figure 5 This is a schematic diagram of the connection between the heat pump evaporation assembly and the partition plate of the present invention; Figure 6 This is a schematic diagram of the connection between the rotating drum and the material trough of the present invention; Figure 7 This is a schematic diagram of the connection between the scraper and the trough of the present invention; Figure 8 This is a schematic diagram showing the connection between the U-shaped pusher and the adjusting seat of the present invention; Figure 9 This is a schematic diagram showing the connection between the scraper and the adjusting seat of the present invention; Figure 10 This is a schematic diagram of the sealing cover of the present invention; Among them, 1-Equipment box, 10-Box door, 11-Partition, 12-Observation window, 2-Distillation assembly, 20-Distillation kettle, 200-Water inlet pipe, 201-Steam discharge pipe, 202-Concentrate discharge pipe, 21-Heat exchange coil, 22-Agitator, 23-Agitator motor, 24-Lifting screw, 3-Heat pump evaporation assembly, 30-Heat pump evaporator, 31-Compressor, 32-Condenser, 320-Three-way valve, 33-Outer shell, 330-Condensate discharge pipe, 34-Evaporation plate, 340-Interconnecting pipe, 341-Refrigerant dosing pipe, 342-Refrigerant circulation pipe, 3420-Connecting gear, 35-Expansion valve, 36-Air inlet box, 360-Gas distribution nozzle, 361-Annular pipeline, 37-Micro motor 370-Drive gear, 4-Drum scraper dryer, 40-Feed trough, 41-Rotating drum, 410-Support, 411-Connecting shaft, 412-Hot steam injection pipe, 413-Inner cylinder, 42-Drum motor, 43-Scraper, 430-Adjusting seat, 431-Lever, 432-U-shaped push frame, 433-First adjusting screw, 434-Movable rotating shaft, 435-Adjusting gear, 436-Moving rack, 437-Second adjusting screw, 44-Discharge screw, 440-Receiving cavity, 441-Discharge motor, 442-Discharge pipe, 45-Feed pump, 46-Stirring rod, 460-First pulley, 461-Second pulley, 47-Sealing cover, 470-Arc-shaped guide groove, 471-Collection trough. Detailed Implementation

[0019] Example 1 like Figure 1 , 2 The heat pump low-temperature continuous evaporation and drying device shown includes an equipment box 1 and a distillation assembly 2, a heat pump evaporation assembly 3, and a drum scraper dryer 4 installed inside the equipment box 1; a box door 10 is movably hinged to the front end of the box body 1, and a partition 11 is installed inside the box body 1; an observation window 12 is provided on the box door 10. like Figure 1 As shown, the distillation assembly 2 includes a distillation vessel 20 located at the bottom of the equipment box 1, a heat exchange coil 21 coiled inside the distillation vessel 20, a stirrer 22 rotatably clamped inside the distillation vessel 20, and a stirring motor 23 located at the top of the distillation vessel 20 and providing power to the stirrer 22; a water inlet pipe 200 penetrating the equipment box 1 is provided at the upper end of the outer wall of the distillation vessel 20, a steam discharge pipe 201 penetrating the partition 11 is provided at the top of the distillation vessel 20, and a concentrated water discharge pipe 202 is provided at the lower end of the outer wall of the distillation vessel 20; like Figure 1 , 5As shown, the heat pump evaporation assembly 3 is disposed on the upper end face of the partition 11. The heat pump evaporation assembly 3 includes a heat pump evaporator 30 and a compressor 31 and a condenser 32 respectively connected to the heat pump evaporator 30. The heat pump evaporator 30 includes an outer shell 33 and nine evaporation plates 34 equidistantly distributed inside the outer shell 33. A condensate drain pipe 330 penetrating the equipment box 1 is provided at the lower end of the outer wall of the outer shell 33, and a steam drain pipe 201 is connected to the inside of the outer shell 33. The evaporation plates 34 are hollow inside, and each evaporation plate 34 is connected to the other through an interconnecting pipe 340. The interconnecting pipes 340 on two adjacent evaporation plates 34 are staggered, and the evaporation plates 34 located at the left and right ends inside the outer shell 33 are respectively provided with pipes penetrating the outer shell. The compressor 33 has a refrigerant injection pipe 341 and a refrigerant circulation pipe 342. One end of the compressor 31 is connected to the refrigerant circulation pipe 342, and the other end is connected to one port of the heat exchange coil 21. One end of the condenser 32 is connected to the other port of the heat exchange coil 21, and the other end of the condenser 32 is connected to the refrigerant injection pipe 341 through a three-way valve 320, and an expansion valve 35 is provided at the connection. Flow monitoring instruments (commercially available products) are provided at the connection between the condenser 32 and the heat exchange coil 21, and at the connection between the condenser 32 and the refrigerant injection pipe 341. The flow monitoring instruments are used to monitor the flow of refrigerant in real time to ensure the flow stability of refrigerant and prevent the system from experiencing poor refrigerant circulation. like Figure 1 , 2 As shown in Figures 6 and 7, the drum scraper dryer 4 includes a material trough 40 located at the bottom of the equipment box 1, a rotating drum 41 rotatably connected to the inside of the material trough 40 via a bracket 410, a drum motor 42 mounted on the bracket 410 and providing power to the rotating drum 41, a scraper 43 located at the top of the material trough 40, and a discharge spiral 44 rotatably connected to the inside of the material trough 40 and located outside the scraper 43; a concentrated water discharge pipe 202 is connected to the material trough 40, and a feed pump 45 is provided at the connection point; both ends of the rotating drum 41 are respectively provided with a connecting shaft 411 rotatably connected to the bracket 410 and a hot steam injection pipe 412, and the output end of the drum motor 42 is connected to the connecting shaft 411; a receiving cavity 440 for accommodating the discharge spiral 44 is provided on one side of the material trough 40, a discharge motor 441 providing power to the discharge spiral 44 is provided on one side of the material trough 40, and a discharge pipe 442 communicating with the inside of the receiving cavity 440 and penetrating the equipment box 1 is provided on the other side.

[0020] In this embodiment, the stirring motor 23, compressor 31, condenser 32, expansion valve 35, drum motor 42, discharge motor 441 and feed pump 45 all adopt existing technologies and are not specifically limited here. Those skilled in the art can select the corresponding products according to actual needs.

[0021] Example 2 The difference between this embodiment and Embodiment 1 is that: like Figure 1 , 4 As shown, six air inlet boxes 36 are evenly distributed on the inner wall of the outer shell 33. Each air inlet box 36 is provided with a uniform air nozzle 360 ​​on the side away from the inner wall of the outer shell 33. An annular pipe 361 is provided on the outer wall of the outer shell 33, which is connected to each air inlet box 36. The steam discharge pipe 201 is connected to the annular pipe 361. By providing air inlet boxes 36 on the inner wall of the outer shell 33, it is beneficial to improve the uniformity of biogas vapor entering the interior of the outer shell 33, thereby improving the heat exchange effect between biogas vapor and condensate.

[0022] Example 3 The difference between this embodiment and Embodiment 2 is that: like Figure 3 As shown, the condensate dosing pipe 341 is rotatably engaged with the evaporation plate 34 at the corresponding position, and the condensate circulation pipe 342 is rotatably engaged with the compressor 31. A connecting gear 3420 is sleeved on the condensate circulation pipe 342. A micro motor 37 is provided on the outer wall of the outer shell 33. The output end of the micro motor 37 is connected to a drive gear 370 that meshes with the connecting gear 3420. During the heat exchange process between the condensate and the biogas vapor, the micro motor 37 drives the condensate circulation pipe 342 to rotate, thereby causing each evaporation plate 34 to rotate simultaneously inside the outer shell 33, further improving the contact efficiency between the biogas vapor and the evaporation plate 34.

[0023] In this embodiment, the micro motor 37 adopts a product with existing technology, such as the SV-X2MH040A-N2LN servo motor produced by Shanghai Fengxin Transmission Machinery Co., Ltd.

[0024] Example 4 The difference between this embodiment and embodiment 3 is that: like Figure 1 As shown, an inner cylinder 413 is fitted inside the rotating drum 41. One end of the inner cylinder 413 is closed, and the other end of the inner cylinder 413 is fixedly connected to the inner wall of the rotating drum 41. By setting the inner cylinder 413 inside the rotating drum 41, hot steam can enter the cavity between the inner cylinder 413 and the rotating drum 41 to heat the inner wall of the rotating drum 41, thereby reducing the heat loss of the hot steam and helping to reduce the energy consumption of the device.

[0025] Example 5 The difference between this embodiment and embodiment 4 is that: like Figure 1 , 6As shown in Figure 7, stirring rods 46 are rotatably engaged on both sides of the bottom of the trough 40. The ends of the two stirring rods 46 penetrate the trough 40 and are connected to the first pulleys 460. A second pulley 461 is sleeved on the connecting shaft 411. The second pulley 461 is connected to the two first pulleys 460 by belt drive. The stirring rods 46 continuously stir the biogas slurry concentrate inside the trough 40, so that the solid matter in the biogas slurry concentrate is always in a suspended state, thereby improving the uniformity of the solid matter in the biogas slurry concentrate on the surface of the rotating drum 41.

[0026] Example 6 The difference between this embodiment and embodiment 5 is that: like Figure 7 , 8 As shown in Figure 9, the scraper 43 is slidably engaged with the trough 40 via an adjusting seat 430. The adjusting seat 430 is provided with a lever 431 that penetrates the side wall of the trough 40 and is slidably engaged with it. A U-shaped pusher frame 432 connected to the lever 431 is provided on the outer side wall of the trough 40. A first adjusting screw 433, which is rotatably engaged with the outer side wall of the trough 40, is threaded onto the U-shaped pusher frame 432. The scraper 43 is rotatably engaged with the adjusting seat 430 via a movable shaft 434 that penetrates the adjusting seat 430, and an adjusting gear 435 is connected to the end of the movable shaft 434. A movable rack 436, which meshes with an adjusting gear 435, is slidably engaged on the outer wall of the adjusting seat 430. A second adjusting screw 437, which rotates and engages with the movable rack 436, is threaded onto the outer wall of the adjusting seat 430. The first adjusting screw 433 pushes the U-shaped pusher 432 to move on the material trough 40, thereby allowing the adjusting seat 430 to push the scraper 43 away from or closer to the rotating drum 41 under the action of the U-shaped pusher 432. This facilitates the adjustment of the distance between the scraper 43 and the rotating drum 41 according to the thickness of the material layer on the surface of the rotating drum 41. The second adjusting screw 437 pushes the movable rack 436 to move inside the adjusting seat 430. The meshing action of the movable rack 436 with the spur gear 435 causes the scraper 43 to deflect on the adjusting seat 430, thereby facilitating the adjustment of the scraping angle of the scraper 43.

[0027] Example 7 The difference between this embodiment and embodiment 6 is that: like Figure 6 , 10As shown, a sealing cover 47 located outside the rotating drum 41 is rotatably snapped onto the upper end face of the feed trough 40. Nine arc-shaped guide grooves 470 are evenly distributed on the inner wall of the sealing cover 47. Collection grooves 471, which are respectively connected to each arc-shaped guide groove 470, are provided on both sides inside the sealing cover 47. A drain pipe that penetrates the sealing cover 47 is connected to the collection groove 471. By setting the sealing cover 47, the heat loss inside the drum scraper dryer 4 can be reduced. The arc-shaped guide grooves 470 and collection grooves 471 inside the sealing cover 47 can make the steam generated by the biogas concentrate inside the feed trough 40 condense and liquefy quickly, further improving the drying effect of the biogas concentrate.

[0028] Example 8 The difference between this embodiment and embodiment 7 is that: like Figure 1 As shown, the bottom of the stirrer 22 is connected to a lifting screw 24; during the rotation of the stirrer 22, the lifting screw 24 can continuously lift the biogas slurry concentrate at the bottom of the distillation vessel 20, which is beneficial to improving the distillation efficiency of the biogas slurry.

[0029] Example 9 This embodiment describes the application of a heat pump low-temperature continuous evaporation drying device. Based on any one of the heat pump low-temperature continuous evaporation drying devices described in Embodiments 1-7, it is applied to the full-scale resource utilization treatment of manure and sewage.

Claims

1. A heat pump low-temperature continuous evaporation drying device, characterized in that, It includes an equipment box (1) and a distillation assembly (2), a heat pump evaporation assembly (3), and a drum scraper dryer (4) disposed inside the equipment box (1); the box (1) is provided with a partition (11); The distillation assembly (2) includes a distillation vessel (20) located at the bottom of the equipment box (1), a heat exchange coil (21) coiled inside the distillation vessel (20), a stirrer (22) rotatably attached inside the distillation vessel (20), and a stirring motor (23) located at the top of the distillation vessel (20) and providing power to the stirrer (22); a steam exhaust pipe (201) penetrating the partition (11) is provided at the top of the distillation vessel (20). The heat pump evaporation assembly (3) is disposed on the upper end face of the partition (11). The heat pump evaporation assembly (3) includes a heat pump evaporator (30) and a compressor (31) and a condenser (32) respectively connected to the heat pump evaporator (30). The heat pump evaporator (30) includes an outer shell (33) and several evaporation plates (34) equidistantly distributed inside the outer shell (33). A condensate drain pipe (330) penetrating the equipment box (1) is provided at the lower end of the outer wall of the outer shell (33). The steam drain pipe (201) is connected to the outer shell (33). The internal structure is open; the evaporator (34) is provided with a refrigerant dosing pipe (341) and a refrigerant circulation pipe (342) that penetrate the outer shell (33); one end of the compressor (31) is connected to the refrigerant circulation pipe (342), and the other end is connected to one port of the heat exchange coil (21); one end of the condenser (32) is connected to the other port of the heat exchange coil (21), and the other end of the condenser (32) is connected to the refrigerant dosing pipe (341) through a three-way valve (320), and an expansion valve (35) is provided at the connection point. The drum scraper dryer (4) includes a trough (40) located at the bottom of the equipment box (1), a rotating drum (41) rotatably connected to the inside of the trough (40) via a bracket (410), a drum motor (42) located on the bracket (410) and providing power to the rotating drum (41), a scraper (43) located at the top of the trough (40), and a discharge spiral (44) rotatably connected to the inside of the trough (40) and located outside the scraper (43); the end of the rotating drum (41) is provided with a connecting shaft (411) rotatably connected to the bracket (410).

2. The heat pump low-temperature continuous evaporation drying device according to claim 1, characterized in that, Several air inlet boxes (36) are evenly distributed on the inner wall of the outer shell (33). Each air inlet box (36) is provided with an air distribution nozzle (360) on the side away from the inner wall of the outer shell (33). An annular pipe (361) is provided on the outer wall of the outer shell (33) and is connected to each air inlet box (36). The steam discharge pipe (201) is connected to the annular pipe (361).

3. The heat pump low-temperature continuous evaporation drying device according to claim 1, characterized in that, The refrigerant dosing pipe (341) is rotatably engaged with the evaporator plate (34) at the corresponding position, the refrigerant circulation pipe (342) is rotatably engaged with the compressor (31), a connecting gear (3420) is sleeved on the refrigerant circulation pipe (342), a micro motor (37) is provided on the outer wall of the outer shell (33), and the output end of the micro motor (37) is connected to a drive gear (370) that meshes with the connecting gear (3420).

4. The heat pump low-temperature continuous evaporation drying device according to claim 1, characterized in that, The rotating drum (41) is fitted with an inner cylinder (413), one end of which is closed and the other end of which is fixedly connected to the inner wall of the rotating drum (41).

5. The heat pump low-temperature continuous evaporation drying device according to claim 1, characterized in that, Stirring rods (46) are rotatably engaged on both sides of the bottom of the trough (40). The ends of the two stirring rods (46) penetrate the trough (40) and are connected to the first pulleys (460). A second pulley (461) is sleeved on the connecting shaft (411). The second pulley (461) is connected to the two first pulleys (460) by belt drive.

6. The heat pump low-temperature continuous evaporation drying device according to claim 1, characterized in that, The scraper (43) is slidably engaged with the trough (40) via the adjusting seat (430). The adjusting seat (430) is provided with a lever (431) that penetrates the side wall of the trough (40) and is slidably engaged with the trough (40). The outer side wall of the trough (40) is provided with a U-shaped push frame (432) that is connected to the lever (431). The U-shaped push frame (432) is threaded with a first adjusting screw (433) that is rotatably engaged with the outer side wall of the trough (40).

7. A heat pump low-temperature continuous evaporation drying device according to claim 6, characterized in that, The scraper (43) is rotatably engaged with the adjusting seat (430) via a movable shaft (434). The movable shaft (434) passes through the adjusting seat (430), and an adjusting gear (435) is connected to the end of the movable shaft (434). A movable rack (436) that meshes with the adjusting gear (435) is slidably engaged on the outer wall of the adjusting seat (430). A second adjusting screw (437) that is rotatably engaged with the movable rack (436) is threaded onto the outer wall of the adjusting seat (430).

8. The heat pump low-temperature continuous evaporation drying device according to claim 1, characterized in that, The upper end face of the material trough (40) is rotatably snapped with a sealing cover (47) located outside the rotating drum (41). Several arc-shaped guide grooves (470) are evenly distributed on the inner wall of the sealing cover (47). Collection grooves (471) are provided on both sides of the inside of the sealing cover (47) and are respectively connected to each of the arc-shaped guide grooves (470). A drain pipe that penetrates the sealing cover (47) is connected to the collection groove (471).

9. An application of a heat pump low-temperature continuous evaporation drying device, characterized in that, It is applied to the full-scale resource utilization of fecal waste.

10. A heat pump low-temperature continuous evaporation drying device according to claim 9, characterized in that, The rotating drum (41) is fitted with an inner cylinder (413) that is closed at one end and fixedly connected to the inner wall of the rotating drum (41) at the other end.

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