Large-flow heat pump scraper evaporator

Abstract

The invention relates to the technical field of heat pump evaporators, and discloses a large-flow heat pump scraper evaporator which comprises a frame, a working part mounted on the frame and used for providing a stable working space for crystallization and precipitation in raw materials, and a stirring part mounted on the frame and the working part and used for uniformly distributing the raw materials and forming a film-shaped material flow, the feeding part is installed at the inner bottom of the frame and used for inputting and outputting raw materials, the double-heat-exchange part is installed on the inner wall of the frame and used for equally dividing the raw materials and steam to conduct circulation operation, and an original heating system, an original heat exchange system and an original cooling system are equally divided into two parts to be independently controlled through the double-heat-exchange part, the regeneration part and the cold radiator. In this way, the problem of excessive energy loss caused by centralized control when raw materials are treated in a large evaporation tank can be avoided, operation can be more accurately carried out according to actual requirements by independently controlling each part, and therefore the heat exchange efficiency is greatly improved, and the time needed for treating the raw materials is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump evaporators, in particular to a large-flow heat pump scraper evaporator. Background Art

[0002] The working principle of heat pump evaporator is to reduce the demand for external fresh heating steam by recycling the latent heat of secondary steam, thereby achieving energy saving. This evaporator is widely used in chemical, pharmaceutical, food processing, wastewater treatment and other industries.

[0003] According to the Chinese patent publication number CN110280031B, the patent relates to a heat pump evaporator, including two base plates, one of which is provided with a first shell above the base plate, ventilation components are provided on both sides of the first shell, a first shell cover is provided above the first shell, a connecting ring is fixed in the first shell, and a plurality of through holes are provided on the connecting ring, a box is fixed below the connecting ring, two main pipes are placed in the box, and a plurality of connecting pipes are connected between the main pipes. The first shell cover is opened to facilitate the installation of parts in the first shell, and the connecting ring is installed in the first shell. The purpose of fixing the box is achieved through the connecting ring, and water enters the box. The connecting pipe is cooled by the water in the box. The second heat-absorbing fin is set to achieve a better heat dissipation purpose. This device is reasonably designed and easy to operate. Through the cooperation of the through hole and the box, a better heat dissipation purpose is achieved, so that this device can work normally and is convenient for people to use normally.

[0004] Conventional heat pump evaporators are equipped with a system in the evaporation tank, which is centrally controlled under the system. The processing of liquid in a large evaporation tank is too concentrated, and the energy loss is large. Its heat exchange efficiency and the time for processing raw materials cannot be significantly improved. Therefore, a large flow heat pump scraper evaporator is proposed to solve the above problems. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a large-flow heat pump scraper evaporator, which solves the problem that large evaporation tanks are centrally controlled under a system, resulting in large energy loss and the heat exchange efficiency and raw material processing time cannot be significantly improved.

[0006] (II) Technical solution To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a large-flow heat pump scraper evaporator, comprising a frame, a working part installed on the frame, and providing a stable working space for crystallization precipitation in the raw material, a stirring part installed on the frame and the working part, and used to evenly distribute the raw material and form a thin film material flow, a feeding part installed on the inner bottom of the frame, and used for input and output of raw materials, a double heat exchange part installed on the inner wall of the frame, and used to divide the raw material and steam equally for circulation operation, a circulation part installed between the working part and the double heat exchange part, and used to continuously transport and heat the raw material, and a regeneration part installed on the inner bottom of the frame, and used to compress steam to increase steam energy to heat the raw material.

[0007] Preferably, the working part includes a front end cover and a rear end cover, and the front end cover and the rear end cover are respectively installed on the left and right sides of the frame, a crystallization tank is installed between the front end cover and the rear end cover, a Miller plate is installed on the bottom of the outer wall of the crystallization tank, visual mirrors are installed on the front end cover and the rear end cover, a steam port is connected to the rear end cover, and a slag discharge device is connected to the rear end cover.

[0008] Preferably, the stirring part includes a driving motor, which is installed on the left side of the inner wall of the frame. A screw pusher is arranged in the crystallization tank, and the screw pusher includes a main shaft and a spiral blade. The main shaft is rotatably connected between the front cover and the rear cover. A transmission device is installed between the end of the main shaft and the output shaft of the driving motor. Six scrapers are staggered on the main shaft, and each of the scrapers is arranged between two adjacent blade surfaces in the spiral blade.

[0009] Preferably, the feeding part includes a raw material box, which is installed at the bottom of the inner wall of the frame, the top of the raw material box is connected to a filling port, the front of the raw material box is connected to a drawing pipe, the drawing pipe is connected to the crystallization tank through the rear end cover, the back of the raw material box is connected to a conveying port, and the left side of the raw material box is connected to a discharge pipe.

[0010] Preferably, the dual heat exchange part includes a suction pump, the inlet of the suction pump is connected to the discharge pipe, the outlet of the suction pump is connected to a diversion pipe, the two pipe openings of the diversion pipe are connected to heat exchange devices installed, the back bottoms of the two heat exchange devices are provided with drain outlets, and the front tops of the two heat exchange devices are respectively connected to return steam pipe one and return steam pipe two.

[0011] Preferably, the steam return pipe 1 is fixedly passed through the front end cover and is connected to the crystallization tank through the front end cover, and the steam return pipe 2 is fixedly passed through the rear end cover and is connected to the crystallization tank through the rear end cover.

[0012] Preferably, the circulation part includes a circulation pipe, which is installed on the front end cover and connected to the crystallization tank, the top of the circulation pipe is connected to a defoaming barrel, a feed pipe one is connected to the defoaming barrel, the bottom end of the feed pipe one is connected to one of the heat exchange devices, the side wall of the feed pipe one is connected to a feed pipe two, and the bottom end of the feed pipe two is connected to another heat exchange device.

[0013] Preferably, the regeneration section includes two compressors, both of which are installed at the bottom of the inner wall of the frame, and the outlets of the two compressors are connected to regeneration steam pipes, both of which extend to the top of the raw material box and are connected to the raw material box, and the inlets of the two compressors are connected to steam inlet pipe 1 and steam inlet pipe 2 respectively, and the ends of the steam inlet pipe 1 and the steam inlet pipe 2 away from the compressor are respectively connected to the front bottoms of the two heat exchange devices.

[0014] Preferably, two cold rows are installed on the top of the frame, and the two cold rows are symmetrically distributed above the outside of the crystallization tank. Door panels are installed on the front, back, left and right sides of the frame.

[0015] Preferably, an electric control cabinet is installed on the left side of the front side of the frame, and the electric control cabinet is electrically connected to the two cold rows, the electric control cabinet is electrically connected to the slag discharge device, the electric control cabinet is electrically connected to the drive motor, the electric control cabinet is electrically connected to the feed pump, and the electric control cabinet is electrically connected to the two compressors.

[0016] (III) Beneficial effects Compared with the prior art, the present invention provides a large flow heat pump scraper evaporator, which has the following beneficial effects: 1. The large-flow heat pump scraper evaporator adopts double heat exchange parts, regeneration parts and cold row to divide the original heating system, heat exchange system and cooling system into two parts for separate control. This can avoid the problem of excessive energy loss caused by centralized control when processing raw materials in a large evaporation tank. By controlling each part separately, it can be operated more accurately according to actual needs, thereby greatly increasing the heat exchange efficiency and reducing the time required for processing raw materials.

[0017] 2. The large-flow heat pump scraper evaporator adopts a driving motor in the stirring part to drive the screw pusher to rotate through a transmission device. The six scrapers staggered on the main shaft of the screw pusher can effectively promote the uniform distribution of raw materials when rotating with the spiral blades. This not only prevents the raw materials from adhering to the inner wall of the crystallization tank, but also prompts the raw materials to form a film. The film-like raw materials increase the contact area with the heating surface, so that the raw materials can receive heat more fully, improve the heat exchange efficiency, and then accelerate the evaporation speed, enhance the overall performance of the evaporator, facilitate the crystallization process, and improve the crystallization efficiency.

[0018] 3. The large-flow heat pump scraper evaporator adopts visual mirrors installed on the front cover and the rear cover of the working part, which can observe the evaporation distribution inside the crystallizer from both sides. The operator can timely understand the state of the raw materials in the crystallizer, and connect it to various electrical equipment through the electric control cabinet, so as to adjust the operating parameters when necessary, further ensure the uniform heating and evaporation of the raw materials, and improve the working accuracy.

[0019] 4. The large-flow heat pump scraper evaporator adopts a raw material box in the feeding part with a partition to isolate the raw materials and viscous materials. The injection port on the top is convenient for adding raw materials. The extraction pipe on the front is used to extract the viscous materials in the crystallization tank. The conveying port on the back can convey the viscous materials to the subsequent process. The discharge pipe on the left sends the raw materials to the double heat exchange part. This structural design makes the flow and processing of raw materials in the whole system more orderly and efficient, improves the circulation efficiency of raw materials, and avoids mutual interference of materials in different states.

[0020] 5. The large-flow heat pump scraper evaporator adopts a dual-heat exchange part extraction pump to extract the raw material in the raw material box, and sends it to two heat exchange devices through the diversion pipe. The heat exchange device adopts a shell-and-tube heat exchanger. The raw material rises in the internal shell and tube for heat exchange. At the same time, the two compressors in the regeneration part suck the primary steam after heat exchange through the steam inlet pipe for compression. The generated secondary steam is sent back to the raw material box through the regeneration steam pipe to heat the raw material. The thermal energy of the primary steam is preferentially exchanged with the rising raw material in the heat exchange device, which reduces the heat loss in the raw material transportation process, realizes the recycling of steam energy, greatly improves the steam utilization rate, and reduces the consumption of external energy.

[0021] 6. The large-flow heat pump scraper evaporator adopts a defoaming barrel in the circulation part to eliminate the foam generated in the raw material transportation process, avoid the interference of foam on the production process, prevent the loss of raw materials caused by foam overflow, and avoid the influence of foam on the stability of raw material flow in the pipeline, thereby ensuring the stability and safety of the production process.

[0022] 7. The large-flow heat pump scraper evaporator uses two cold rows installed on the top of the frame to perform real-time temperature control during the raw material reaction to prevent local overcooling or overheating, ensuring that the temperature in the entire crystallization tank is uniform and stable. The Miller plate installed at the bottom of the outer wall of the crystallization tank can improve the heat exchange efficiency, guide the raw materials to be evenly distributed on the heating surface of the evaporator, so that the liquid can be evenly spread, ensuring that each area can be fully heated and evaporated. The synergistic effect of the two improves the overall performance of the evaporator, helps to obtain high-quality crystallized products, and ensures the stability and consistency of product quality.

[0023] 8. The large-flow heat pump scraper evaporator adopts door panels installed on the front, back, left and right sides of the frame, which improves the working safety and stability of the frame surrounding the crystallization tank and other structures. The door panels can prevent external factors from interfering with and colliding with the internal equipment. At the same time, during the operation of the equipment, it prevents people from accidentally touching the internal high temperature, high pressure and operating parts, reducing safety risks. The opening and closing design of the door panels facilitates maintenance inside the frame, improves the convenience of equipment maintenance, reduces maintenance time and cost, and is conducive to long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a large flow heat pump scraper evaporator proposed by the present invention; Figure 2 This is an axial view of the working part of a large flow heat pump scraper evaporator proposed by the present invention; Figure 3 This is an enlarged view of the rear end cover of a large flow heat pump scraper evaporator proposed by the present invention; Figure 4 Another side axial view of the working part of a large flow heat pump scraper evaporator proposed by the present invention; Figure 5 This is an enlarged view of the front end cover of a large flow heat pump scraper evaporator proposed by the present invention; Figure 6 A connection diagram of a feeding part, a double heat exchange part, a circulation part and a regeneration part of a large flow heat pump scraper evaporator proposed by the present invention; Figure 7 This is an enlarged view of the feeding part of a large flow heat pump scraper evaporator proposed by the present invention; Figure 8 Another side axial view of the feeding part of a large flow heat pump scraper evaporator proposed by the present invention; Fig. 9 This is a schematic diagram of the structure of a double heat exchange part of a large flow heat pump scraper evaporator proposed by the present invention; Fig.10 This is a structural schematic diagram of a stirring portion of a large-flow heat pump scraper evaporator proposed by the present invention.

[0025] In the figure: 1, frame; 2, working part; 21, front cover; 22, rear cover; 23, crystallization tank; 24, Miller plate; 25, visual mirror; 26, steam port; 27, slag discharge device; 3, stirring part; 31, driving motor; 32, transmission device; 33, screw pusher; 34, scraper; 4, feeding part; 41, raw material box; 42, injection port; 43, extraction pipe; 44, conveying port; 45, discharge pipe; 5. Double heat exchange unit; 51. Extraction pump; 52. Diverter pipe; 53. Heat exchange device; 54. Drain outlet; 55. Return steam pipe 1; 56. Return steam pipe 2; 6. Circulation unit; 61. Circulation pipe; 62. Defoaming barrel; 63. Feed pipe 1; 64. Feed pipe 2; 7. Regeneration unit; 71. Compressor; 72. Regeneration steam pipe; 73. Steam inlet pipe 1; 74. Steam inlet pipe 2; 8. Radiator; 9. Door panel; 10. Electric control cabinet. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-10 The present invention provides a technical solution: a large-flow heat pump scraper evaporator, including a frame 1, the frame 1 is used as the main structure for installing and supporting the heat pump evaporator, the working part 2 of this case is installed on the frame 1, and is used to provide a stable working space for crystallization precipitation in the raw material, the stirring part 3 of this case is installed on the frame 1 and the working part 2, and is used to evenly distribute the raw material and form a thin film material flow, the feeding part 4 of this case is installed on the inner bottom of the frame 1, and is used for the input and output of the raw material, the double heat exchange part 5 of this case is installed on the inner wall of the frame 1, and is used to divide the raw material and steam equally for circulation operation, the circulation part 6 of this case is installed between the working part 2 and the double heat exchange part 5, and is used to continuously transport the heated raw material, and the regeneration part 7 of this case is installed on the inner bottom of the frame 1, and is used to compress the steam to increase the steam energy to heat the raw material.

[0028] In this embodiment, in order to make the raw materials evenly distributed and improve the efficiency of crystallization, the working part 2 of this case includes a front cover 21 and a rear cover 22, which are respectively installed on the left and right sides of the frame 1, and a crystallization tank 23 is installed between the front cover 21 and the rear cover 22. A Miller plate 24 is installed at the bottom of the outer wall of the crystallization tank 23. The Miller plate 24 improves the heat exchange efficiency and realizes uniform heat exchange. A visual mirror 25 is installed on the front cover 21 and the rear cover 22, and the evaporation distribution inside the crystallization tank 23 can be observed from both sides through the visual mirror 25. A steam port 26 is installed on the rear cover 22, and the steam port 26 is used to inject raw steam. A slag discharge device 27 is installed on the rear cover 22. The slag discharge device 27 is a device composed of an air pump and a slag discharge pipeline. The gas generated by the air pump is used to form a negative pressure environment in the crystallization tank 23. Under the action of the pressure difference, the slag is sucked into the collecting device through the slag discharge pipeline.

[0029] In order to further promote uniform distribution of raw materials, the stirring part 3 in this case includes a driving motor 31, which is installed on the left side of the inner wall of the frame 1. A screw pusher 33 is arranged in the crystallization tank 23, and the screw pusher 33 includes a main shaft and a spiral blade. The main shaft is rotatably connected between the front cover 21 and the rear cover 22. A transmission device 32 is installed between the end of the main shaft and the output shaft of the driving motor 31. Six scrapers 34 are staggered on the main shaft, and each scraper 34 is respectively arranged between two adjacent blade surfaces in the spiral blade. The scraper 34 is used to promote uniform distribution of raw materials, accelerate evaporation speed and improve heat exchange efficiency.

[0030] It is worth noting that in order to improve the circulation efficiency of raw materials, the feeding part 4 in this case includes a raw material box 41. A partition is provided in the raw material box 41 to isolate the raw materials and viscous materials. The raw material box 41 is installed at the bottom of the inner wall of the frame 1. The top of the raw material box 41 is connected to a filling port 42, and the raw materials are added by using the filling port 42. The front of the raw material box 41 is connected to a suction pipe 43, and the viscous material in the crystallization tank is extracted by using the suction pipe 43. The suction pipe 43 is connected to the crystallization tank 23 through the rear end cover 22. The back of the raw material box 41 is connected to a conveying port 44, which is connected to an external thickener and conveys the viscous material to the subsequent process. The left side of the raw material box 41 is connected to a discharge pipe 45, and the raw materials are delivered to the double heat exchange part 5 by using the discharge pipe 45.

[0031] In order to reduce the heat exchange pressure in the large flow evaporator, the double heat exchange part 5 of this case includes a pump 51, whose model can refer to the KSB-ETABLOC series pump, which has a wide flow coverage range and can meet the large flow requirements of large systems. The inlet of the pump 51 is connected to the discharge pipe 45, and the pump 51 is used to extract the raw material in the raw material box 41. The outlet of the pump 51 is connected to the diverter pipe 52, and the two pipe openings of the diverter pipe 52 are connected and installed with a heat exchange device 53. The heat exchange device 53 adopts the existing technology 4 point 8 square ASM shell and tube heat exchanger, and the diverter pipe 52 The raw materials are equally delivered to two heat exchange devices 53. The bottom of the back sides of the two heat exchange devices 53 are provided with drain ports 54, and the drain ports 54 recover and discharge the condensed water. The top of the front sides of the two heat exchange devices 53 are respectively connected with a steam return pipe 1 55 and a steam return pipe 2 56. The primary steam in the crystallizer 23 is recovered through the steam return pipe 1 55 and the steam return pipe 2 56. The steam return pipe 1 55 is fixedly passed through the front end cover 21 and is connected to the crystallizer 23 through the front end cover 21. The steam return pipe 2 56 is fixedly passed through the rear end cover 22 and is connected to the crystallizer 23 through the rear end cover 22.

[0032] In order to circulate and inject the heated raw materials into the crystallizer 23, the circulation part 6 in this case includes a circulation pipe 61, which is installed on the front end cover 21 and connected to the crystallizer 23. The circulation pipe 61 delivers the raw materials into the crystallizer 23. The top of the circulation pipe 61 is connected to a defoaming barrel 62, which is used to eliminate the foam generated in the conveying raw materials to ensure the stability and safety of the production process. A feed pipe 1 63 is connected to the defoaming barrel 62, and the bottom end of the feed pipe 1 63 is connected to one of the heat exchange devices 53. A feed pipe 2 64 is connected to the side wall of the feed pipe 1 63, and the bottom end of the feed pipe 2 64 is connected to another heat exchange device 53. The raw materials after heat exchange are collected into the defoaming barrel 62 through the feed pipe 1 63 and the feed pipe 2 64.

[0033] In order to further improve the steam utilization rate, the regeneration part 7 of this case includes two compressors 71, whose model can refer to the 184 compression machine, that is, Danfoss SH184A4ALC is a scroll compression machine with the advantages of high efficiency, stability and low noise. The two compressors 71 are installed at the bottom of the inner wall of the frame 1, and the outlets of the two compressors 71 are connected with the regeneration steam pipe 72. The two regeneration steam pipes 72 extend to the top of the raw material box 41 and are connected with the raw material box 41. The inlets of the two compressors 71 are connected with the steam inlet pipe 1 73 and the steam inlet pipe 2 74 respectively. The ends of the steam inlet pipe 1 73 and the steam inlet pipe 2 74 away from the compressor 71 are respectively connected with the front bottoms of the two heat exchange devices 53. The primary steam after heat exchange is sucked into the compressor 71 through the steam inlet pipe 1 73 and the steam inlet pipe 2 74, and compressed to produce secondary steam, which is sent into the raw material box 41 through the regeneration steam pipe 72 to heat the raw material.

[0034] It is worth mentioning that two radiators 8 are installed on the top of the frame 1. The model of the radiator 8 can refer to the Haiode 30-horsepower shell and tube type, which is suitable for large-scale heat pump systems. It has high heat exchange capacity and pressure resistance, and can maintain stable performance under high-load operating conditions to ensure the efficient operation of the heat pump system. The two radiators 8 are symmetrically distributed above the outside of the crystallization tank 23. Door panels 9 are installed on the front, back, left and right sides of the frame 1. An electric control cabinet 10 is installed on the left side of the front of the frame 1. The electric control cabinet 10 is electrically connected to the two radiators 8, the electric control cabinet 10 is electrically connected to the slag discharge device 27, the electric control cabinet 10 is electrically connected to the drive motor 31, the electric control cabinet 10 is electrically connected to the feed pump 51, and the electric control cabinet 10 is electrically connected to the two compressors 71.

[0035] Working principle: raw materials enter the raw material box 41 through the injection port 42, and the raw materials are extracted from the raw material box 41 by the extraction pump 51 and are equally transported to two heat exchange devices 53 through the diversion pipe 52. The raw materials rise in the array of tubes inside the heat exchange device 53 and are concentrated into the defoaming barrel 62 through the feed pipe 1 63 and the feed pipe 2 64. The raw materials after the bubbles are eliminated enter the crystallization tank 23 through the circulation pipe 61, and the steam port 26 is used to transport the raw steam and the raw materials in the crystallization tank 23 for preliminary reaction and heating. The driving motor 31 drives the screw pusher 33 to rotate and stir through the transmission device 32. The transmission device 32 adopts the existing technology gears and toothed belts to drive and connect the output shaft of the driving motor 31 with the main shaft of the screw pusher 33, so as to realize synchronous rotation. The scraper 34 rotates with the spiral blade to stir the raw materials for uniform distribution, prevent adhesion and promote the raw materials to form a film. On the one hand, the contact area between the material and the heating surface is increased, and on the other hand, the material can receive heat more fully, thereby improving the heat exchange efficiency, accelerating the evaporation rate, and enhancing the overall performance of the evaporator.

[0036] The two compressors 71 work to generate negative pressure suction in the two heat exchange devices 53, thereby forming an equal negative pressure suction on both sides of the inside of the crystallizer 23 through the return steam pipe 1 55 and the return steam pipe 2 56, so that the primary steam generated after the raw material is heated is sucked into the two heat exchange devices 53 from the return steam pipes on both sides. The heat energy of the primary steam is preferentially heat-exchanged with the raw material rising in the tube array, so that the raw material is heated and the heat loss during the raw material transportation process is reduced. After the primary steam is heat-exchanged, it settles in the heat exchange device 53, and the condensed water is discharged through the drain port 54. The low-temperature steam enters the compressor 71 through the steam inlet pipe 1 73 and the steam inlet pipe 2 74 for compression to increase the steam energy, and then returns to the raw material box 41 through the regeneration steam pipe 72 as a heating source to heat the raw material, thereby making full use of the steam energy for circulation work and improving the energy utilization rate. After the evaporation reaction, the moisture of the raw material is continuously discharged to form a viscous state, and the viscous material returns to the middle layer of the raw material box 41 through the extraction pipe 43, and is sent to the filter, thickener and other equipment through the conveying port 44 for subsequent processing, thereby realizing the crystallization production of the raw material.

[0037] The two heat exchange devices 53 divide the steam recovery inside the crystallizer 23 into two working areas through the steam return pipe 1 55 and the steam return pipe 2 56, thereby reducing the working pressure of the large-flow heat pump evaporator. The two cold rows 8 perform real-time temperature control during the raw material reaction to prevent local overcooling or overheating. The Miller plate 24 is used to guide the raw materials to be evenly distributed on the heating surface of the evaporator so that the liquid can be evenly spread to ensure that each area can be fully heated and evaporated, thereby improving the overall performance of the evaporator, reducing the working pressure while promoting the crystallization process and crystallization efficiency. The door panel 9 improves the working safety and stability of the frame 1 surrounding the crystallizer 23 and other structures. At the same time, the opening and closing of the door panel 9 can be used to maintain the inside of the frame 1. The electric control cabinet 10 serves as the main control console to perform real-time regulation and control of various electrical equipment in this case, facilitating the development of daily work.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A large flow heat pump scraper evaporator, characterized in that: include: Frame (1); A working part (2) is mounted on the frame (1) and is used to provide a stable working space for crystallization of the raw material; A stirring portion (3) mounted on the frame (1) and the working portion (2) and used for evenly distributing the raw materials and forming a thin film material flow; A feeding part (4), installed on the inner bottom of the frame (1), used for inputting and outputting raw materials; A double heat exchange part (5) is installed on the inner wall of the frame (1) and is used to equally divide the raw material and steam for circulation operation; A circulation part (6) is installed between the working part (2) and the double heat exchange part (5) and is used for continuously conveying the heated raw material; A regeneration section (7) installed on the inner bottom of the frame (1) and used to compress steam to increase steam energy to heat raw materials; The working part (2) comprises a front cover (21) and a rear cover (22), the front cover (21) and the rear cover (22) being mounted on the left and right sides of the frame (1) respectively, a crystallization tank (23) being mounted between the front cover (21) and the rear cover (22), a Miller plate (24) being mounted on the bottom of the outer wall of the crystallization tank (23), a visual mirror (25) being mounted on both the front cover (21) and the rear cover (22), a steam port (26) being mounted on the rear cover (22), and a slag discharge device (27) being mounted on the rear cover (22); The feeding part (4) comprises a raw material box (41), the raw material box (41) is mounted on the bottom of the inner wall of the frame (1), the top of the raw material box (41) is connected to a material injection port (42), the front of the raw material box (41) is connected to a material extraction pipe (43), the material extraction pipe (43) is connected to the crystallization tank (23) through the rear end cover (22), the back of the raw material box (41) is connected to a conveying port (44), and the left side of the raw material box (41) is connected to a material discharge pipe (45); The dual heat exchange part (5) comprises a pump (51), the inlet of the pump (51) is connected to the discharge pipe (45), the outlet of the pump (51) is connected to a diverter pipe (52), both pipe openings of the diverter pipe (52) are connected to heat exchange devices (53) installed, the bottom of the back of the two heat exchange devices (53) are provided with a drain port (54), and the top of the front of the two heat exchange devices (53) are respectively connected to a first steam return pipe (55) and a second steam return pipe (56); The first steam return pipe (55) is fixedly passed through the front end cover (21) and is connected to the crystallization tank (23) through the front end cover (21); the second steam return pipe (56) is fixedly passed through the rear end cover (22) and is connected to the crystallization tank (23) through the rear end cover (22); The circulation part (6) comprises a circulation pipe (61), the circulation pipe (61) is installed on the front end cover (21) and is connected to the crystallization tank (23), the top end of the circulation pipe (61) is connected to a defoaming barrel (62), a feed pipe 1 (63) is connected to the defoaming barrel (62), the bottom end of the feed pipe 1 (63) is connected to one of the heat exchange devices (53), the side wall of the feed pipe 1 (63) is connected to a feed pipe 2 (64), and the bottom end of the feed pipe 2 (64) is connected to the other heat exchange device (53).

2. A large flow heat pump scraper evaporator according to claim 1, characterized in that: The stirring part (3) comprises a driving motor (31), and the driving motor (31) is mounted on the left side of the inner wall of the frame (1). A screw pusher (33) is arranged in the crystallization tank (23), and the screw pusher (33) comprises a main shaft and a spiral blade. The main shaft is rotatably connected between the front cover (21) and the rear cover (22), and a transmission device (32) is installed between the end of the main shaft and the output shaft of the driving motor (31). Six scrapers (34) are staggeredly installed on the main shaft, and each of the scrapers (34) is respectively arranged between two adjacent blade surfaces of the spiral blade.

3. A large flow heat pump scraper evaporator according to claim 2, characterized in that: The regeneration section (7) comprises two compressors (71), the two compressors (71) are both mounted on the bottom of the inner wall of the frame (1), the outlets of the two compressors (71) are both connected to a regeneration steam pipe (72), the two regeneration steam pipes (72) extend to the top of the raw material box (41) and are connected to the raw material box (41), the inlets of the two compressors (71) are respectively connected to a first steam inlet pipe (73) and a second steam inlet pipe (74), and the ends of the first steam inlet pipe (73) and the second steam inlet pipe (74) away from the compressor (71) are respectively connected to the front bottoms of the two heat exchange devices (53).

4. A large flow heat pump scraper evaporator according to claim 3, characterized in that: Two cold rows (8) are installed on the top of the frame (1), and the two cold rows (8) are symmetrically distributed above the outside of the crystallization tank (23). Door panels (9) are installed on the front, back, and left and right sides of the frame (1).

5. A large flow heat pump scraper evaporator according to claim 4, characterized in that: An electric control cabinet (10) is installed on the left side of the front of the frame (1); the electric control cabinet (10) is electrically connected to the two cooling rows (8), the electric control cabinet (10) is electrically connected to the slag discharge device (27), the electric control cabinet (10) is electrically connected to the drive motor (31), the electric control cabinet (10) is electrically connected to the material extraction pump (51), and the electric control cabinet (10) is electrically connected to the two compressors (71).

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