Tobacco threshing, redrying and drying heat supply high-temperature heat pump energy-saving system

Abstract

The utility model relates to a tobacco threshing, redrying and drying heat supply high-temperature heat pump energy-saving system which comprises a low-temperature-stage heat pump cycle and a high-temperature-stage heat pump cycle which are connected through an evaporator-condenser. Moisture exhaust in a moisture exhaust air pipe of a drying area of the redrying machine and cooling air in an air exhaust air pipe of a cooling area of the redrying machine transfer temperature to a low-temperature cycle working medium in a low-temperature-stage heat pump cycle waste gas waste heat recovery evaporator, and then the low-temperature cycle working medium transfers heat to a high-temperature cycle working medium in a high-temperature-stage heat pump cycle; the high-temperature cycle working medium heats circulating air in the drying area of the tobacco leaf / stem drying machine in a drying heater in the high-temperature-stage heat pump cycle, and hot air with the temperature of 65-75 DEG C is formed by adjusting a throttling valve to be conveyed to different areas of the drying area of the re-drying machine. The cascade type heat pump circulation is used, low-temperature waste heat of waste gas discharged by the drying area and the cooling area of the redrying equipment can be fully and efficiently recycled, and circulating air in the drying area of the slice / stem baking machine is heated to the needed temperature. The system has the advantages of high efficiency, low carbon emission, low operation cost, full-automatic operation and the like.

Description

Technical Field

[0001] The utility model relates to a high-temperature heat pump energy-saving system for heating tobacco leaf threshing, re-baking and drying, and belongs to the technical field of energy conservation and emission reduction. Background Art

[0002] Leaf threshing and redrying technology is a major technological reform in my country's tobacco industry. From foreign experience and the results of my country's leaf threshing and redrying experiments, it can be seen that leaf threshing and redrying can further rationalize the processing technology of the entire tobacco industry and obtain considerable economic benefits. In summary, leaf threshing and redrying can reduce tobacco leaf crushing, improve tobacco leaf utilization, and improve economic benefits; leaf threshing in the redrying plant can provide high-quality and standardized raw materials to the tobacco factory; it is convenient for packaging, transportation and storage; leaf threshing in the redrying plant can fundamentally transform the redrying plant, shorten the silk-making process of the cigarette factory, and further rationalize the tobacco processing technology.

[0003] At present, tobacco leaves and stems after leaf beating and wind separation enter the slice drying machine and tobacco stem redrying equipment respectively, and all pass through the drying area first, then the cooling area, and then to the rehumidification area or packaging process. During the drying process, the tobacco leaves / stems enter the different temperature areas of the drying area in turn, and the hot air flow generated by the steam heater passes through the material layer for drying. The tobacco leaf / stem redrying equipment has the disadvantages of large steam consumption, no recovery of waste heat from exhaust gas, difficulty in recovering condensate, large space occupied by heating equipment such as boilers, large equipment maintenance, low utilization efficiency, and low degree of automation of the heating system. With the rapid upgrading of redrying technology and the urgent need for energy saving, carbon reduction, and efficiency improvement in the tobacco industry, the existing redrying equipment can no longer meet the production needs of energy saving, carbon reduction, and efficiency improvement in the tobacco industry. It is necessary to design a simple, energy-efficient, green and environmentally friendly redrying heating equipment with a high degree of automation.

[0004] From the perspective of energy conservation, the heat brought in by the steam consumed in the drying area is equal to the sum of the heat of the exhaust gas, the heat of the exhaust gas discharged from the cooling section and the heat loss of the system. In view of this, the utility model proposes a high-temperature heat pump technology that can simultaneously recover the waste heat of the exhaust gas discharged from the drying area of ​​the leaf threshing and re-baking equipment and the waste heat of the exhaust gas discharged from the cooling area. In order to meet the demand for high-temperature hot air in the drying process, cascade high-temperature heat pump technology is adopted. The baking process of this technology does not use steam at all, only uses a small amount of electricity, and eliminates the pipes and accessories of the steam and condensate systems.

[0005] The utility model greatly reduces the baking energy consumption and greenhouse gas emissions of the leaf threshing and redrying plant, and at the same time provides the basic conditions for realizing the fully automated operation of the heating system of the redrying plant. The utility model has the advantages of high efficiency, low carbon emissions, low operating costs, and can be fully automated. Summary of the invention

[0006] In view of the problems and shortcomings of the current heating system for tobacco leaf threshing and redrying plants, the utility model provides a high-temperature heat pump energy-saving technology for heating tobacco leaf threshing and redrying. The utility model uses a cascade heat pump cycle to fully and efficiently recycle the low-temperature waste heat of the exhaust gas discharged from the drying area and cooling area of ​​the redrying equipment, and heat the circulating air in the drying area of ​​the slicer / stem machine to the required temperature. The system has the advantages of high efficiency, low carbon emissions, low operating costs, and can be fully automated.

[0007] The utility model is achieved through the following technical solutions.

[0008] A high-temperature heat pump energy-saving system for heating tobacco leaf threshing, re-drying and drying, comprising a low-temperature heat pump cycle and a high-temperature heat pump cycle, wherein the low-temperature heat pump cycle and the high-temperature heat pump cycle are connected via an evaporator-condenser;

[0009] The moisture exhausted in the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air in the exhaust duct in the cooling area pass through the waste heat recovery evaporator of the low-temperature heat pump circulation exhaust gas, and the temperature is transferred to the low-temperature circulating working medium. Then the low-temperature circulating working medium transfers the heat to the high-temperature circulating working medium in the high-temperature heat pump circulation. The high-temperature circulating working medium heats the circulating air in the drying area of ​​the slice / stem machine in the drying heater in the high-temperature heat pump circulation. By adjusting the throttle valve, the circulating air temperature is formed into 65℃-75℃ and the hot air is transported to different areas of the drying area of ​​the re-drying machine.

[0010] The low-temperature heat pump cycle includes a high-temperature regenerator, a high-temperature expansion valve, an evaporator-condenser, a low-temperature liquid storage tank, a low-temperature compressor, a low-temperature regenerator, a low-temperature expansion valve, an exhaust gas waste heat recovery evaporator, an exhaust fan and several pipelines. The low-temperature circulating working fluid liquid outlet in the low-temperature liquid storage tank is connected to the low-temperature regenerator, the low-temperature expansion valve, and the exhaust gas waste heat recovery evaporator in sequence. The moisture exhaust in the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air duct in the exhaust duct in the cooling area are connected to the waste inlet in the exhaust gas waste heat recovery evaporator. After the heat is transferred to the low-temperature circulating working fluid liquid in the exhaust gas waste heat recovery evaporator, it is discharged through the exhaust fan. The working fluid outlet of the exhaust gas waste heat recovery evaporator is connected to the low-temperature regenerator and the low-temperature compressor in sequence and then enters the evaporator-condenser. After the high-temperature working fluid liquid is condensed in the evaporator-condenser, it returns to the low-temperature liquid storage tank to complete the low-temperature heat pump cycle.

[0011] The high-temperature heat pump cycle includes a circulating fan, a drying heater, a high-temperature liquid storage tank, a high-temperature compressor, a high-temperature regenerator, a high-temperature expansion valve, an evaporator-condenser, a low-temperature liquid storage tank, a throttle valve and a number of pipelines. The high-temperature working medium outlet in the evaporator-condenser is returned to the drying heater through the high-temperature regenerator and the high-temperature compressor in turn. In the drying heater, the high-temperature circulating working medium transfers the temperature to the circulating air in the drying area of ​​the hot slice / stem machine to form hot air, and the hot air is transported to different areas of the drying area of ​​the re-drying machine through the circulating fan; the high-temperature working medium outlet of the drying heater is connected to the high-temperature liquid storage tank, and the high-temperature liquid storage tank outlet is connected to the high-temperature regenerator and the high-temperature expansion valve in turn through the throttle valve and then enters the evaporator-condenser to complete the high-temperature heat pump cycle.

[0012] The evaporator-condenser is a falling film evaporator-condenser, comprising a liquid guide A, an upper tube plate A, a liquid feed pipe A, a falling film heat transfer tube A, a lower tube plate A, a liquid storage tank A, a high temperature working fluid pump A, an inlet I, an outlet I, an inlet II and an outlet II. The side of the device body is provided with an inlet I, an outlet I and an inlet II from top to bottom respectively, and the top of the device body is provided with an outlet II. The inside of the device body is provided with an upper tube plate A and a lower tube plate A which are horizontal and located on the upper side. A plurality of vertical falling film heat transfer tubes A are provided between the upper tube plate A and the lower tube plate A. The top end of the falling film heat transfer tube A is opened, and a liquid guide A is provided at the opening. A liquid storage tank A is provided at the bottom of the device body. The bottom of the liquid storage tank A is connected to the interior of the upper part of the device body through the high temperature working fluid pump A. The inlet I is connected to the low temperature working fluid vapor, and the inlet II is connected to the high temperature circulating working fluid liquid. The outlet I is connected to the low temperature liquid storage tank, and the outlet II is connected to the high temperature heat regenerator.

[0013] The evaporator-condenser is a heat pipe type evaporator-condenser, comprising a partition B, a liquid distribution nozzle B, a shell B, a heat pipe with a liquid absorption core B, a liquid storage well IB, a liquid storage well IIB, a high-temperature working fluid spray pump B, an inlet III, an inlet IV and an outlet III. A partition B is provided inside the shell B to separate a number of horizontally placed heat pipes B with liquid absorption cores into a hot end and a cold end. An inlet III is provided at the top of the hot end, and a liquid storage well IB and an outlet III are provided at the bottom of the hot end in sequence. A liquid distribution nozzle B is provided at the cold end and located at the upper part of the shell B. A liquid storage well IIB is provided at the bottom of the cold end, and an inlet IV is provided on the side of the liquid storage well IIB. The bottom of the liquid storage well IIB is connected to the liquid distribution nozzle B through a high-temperature working fluid spray pump B. Low-temperature working fluid steam is introduced into the inlet III, and the outlet III is connected to the low-temperature liquid storage tank. High-temperature circulating working fluid liquid is introduced into the inlet IV. A high-temperature circulating working fluid steam outlet is provided at the top of the cold end, and the high-temperature circulating working fluid steam outlet is connected to a temperature-stage regenerator.

[0014] The waste heat recovery evaporator is a falling film evaporator, including a liquid guide C, an upper tube plate C, a liquid feed pipe C, a falling film heat transfer tube C, a baffle C, a lower tube plate C, a liquid storage tank C, a low temperature working fluid pump C, an inlet V, an inlet VI, an outlet IV and an outlet V. The side of the body is provided with an inlet V, an outlet IV and an inlet VI from top to bottom, respectively, and the top of the body is provided with an outlet V. The body is provided with an upper tube plate C and a lower tube plate C which are located horizontally on the upper side, and a plurality of vertical tube plates C are provided between the upper tube plate C and the lower tube plate C. The falling film heat transfer tube C is arranged in the direction of the falling film heat transfer tube C, the top of the falling film heat transfer tube C is opened, a plurality of baffles C are arranged outside the falling film heat transfer tube C, a liquid guide piece C is arranged at the opening, a liquid storage tank C is arranged at the bottom of the body, the bottom of the liquid storage tank C is passed to the interior of the upper part of the body through a low-temperature-grade working fluid pump C, the inlet V is passed into the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air in the exhaust duct in the cooling area, the inlet VI is passed into the low-temperature circulating working fluid liquid, the outlet IV is connected to the exhaust fan, and the outlet V is connected to the low-temperature-grade heat regenerator.

[0015] The exhaust gas waste heat recovery evaporator is a heat pipe evaporator, including a flue gas side baffle D, a partition D, a spray nozzle D, a shell D, a heat pipe with a liquid absorption core D, a liquid supply pipe D, a liquid storage well D, a low-temperature working fluid spray pump D, an inlet VII, an inlet VIII and an outlet VI. The shell D is provided with a heat pipe with a liquid absorption core inside, and a plurality of horizontal heat pipes with a liquid absorption core D are separated into a hot end and a cold end. The top of the hot end is provided with an inlet VII, and the bottom of the hot end is provided with outlets VI in sequence. The hot end is provided with a plurality of flue gas side baffles. The bottom of the cold end is provided with a liquid storage well D, and the side of the liquid storage well D is provided with an inlet VIII. The bottom of the liquid storage well D is connected to the shower nozzle D through a low-temperature working fluid spray pump D. The inlet VII leads to the exhaust air in the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air in the exhaust duct in the cooling area. The inlet VIII leads to the low-temperature circulating working fluid liquid. The outlet VI is connected to the exhaust fan. The outlet low-temperature circulating working fluid steam outlet at the top of the cold end is connected to the low-temperature reheater.

[0016] The above-mentioned low-temperature grade working fluid is a circulating working fluid with a lower boiling point, and the high-temperature grade working fluid is a circulating working fluid with a higher boiling point.

[0017] TiO is added to the liquid storage tank of the above evaporator-condenser and the waste gas waste heat recovery evaporator. 2 、Al 2 O 3 Or ZnO nanoparticles to further enhance heat transfer.

[0018] The working principle of the utility model is:

[0019] The high-temperature heat pump of the utility model is composed of a low-temperature heat pump cycle and a high-temperature heat pump cycle overlapped. The low-temperature heat pump cycle uses a low-boiling-point working fluid, and the high-temperature heat pump cycle uses a high-boiling-point working fluid. In the low-temperature heat pump cycle, the high-pressure and high-temperature low-temperature working fluid vapor coming out of the low-temperature compressor enters the evaporator-condenser hot fluid side to release heat, the condensed low-temperature working fluid liquid enters the low-temperature liquid storage tank, and then flows into the low-temperature regenerator for further cooling, and the cooled low-temperature working fluid liquid enters the low-temperature expansion valve to reduce pressure and temperature into a low-temperature liquid (with a small amount of flash steam), and the low-temperature liquid then flows into the waste gas waste heat recovery evaporator to absorb the waste heat of the mixed hot waste gas in the drying area and cooling area of ​​the leaf beating and re-baking equipment to evaporate into a low-temperature gaseous working fluid, the low-temperature gaseous working fluid enters the low-temperature regenerator to further cool the low-temperature liquid working fluid on the hot fluid side, and the low-temperature gaseous working fluid coming out of the low-temperature regenerator enters the low-temperature compressor for further compression to complete the low-temperature heat pump cycle.

[0020] In the high-temperature heat pump cycle, the high-temperature working fluid steam with high pressure and temperature coming out of the high-temperature compressor enters the hot fluid side of the drying heater to release heat, heats the circulating air in the drying area of ​​the hot slice / stem machine, and the hot air is sent to the drying tobacco leaves / stems by the circulating fan. The hot air temperature can be controlled to be 65℃-75℃ by adjusting the flow rate of the high-temperature working fluid liquid in the flow valve. The high-temperature circulating working fluid condensate at the outlet of the drying heater enters the high-temperature liquid storage tank, and then flows into the high-temperature regenerator for further cooling. The re-cooled liquid enters the high-temperature expansion valve to reduce the pressure and temperature into a high-temperature low-temperature liquid (with a small amount of flash steam). The high-temperature low-temperature liquid then flows into the cold fluid side of the evaporator-condenser to absorb the heat released by the low-temperature circulating working fluid. The high-temperature low-temperature liquid working fluid absorbs heat and becomes a high-temperature gaseous working fluid. The high-temperature gaseous working fluid enters the high-temperature regenerator to further cool the high-temperature liquid working fluid on the hot fluid side. The high-temperature gaseous working fluid coming out of the high-temperature regenerator enters the high-temperature compressor for further compression to complete the high-temperature heat pump cycle.

[0021] Since there is a heat transfer temperature difference between the low-temperature cycle and the high-temperature cycle of the cascade heat pump, which produces irreversible losses, how to reduce the heat transfer temperature difference in the evaporator-condenser through enhanced heat exchange measures to improve the performance of the heat pump. Falling film evaporator-condenser and heat pipe falling film evaporator-condenser are adopted. Falling film and heat pipe heat transfer technology are used to enhance the boiling heat transfer of the high-temperature liquid working fluid from the high-temperature expansion valve to reduce the irreversible losses in the evaporator-condenser.

[0022] like Figure 2In the evaporator-condenser shown, the high-temperature liquid working medium after being depressurized and cooled by the high-temperature expansion valve flows into the lower liquid storage tank A of the evaporator-condenser 7 through the inlet II, and mixes with the unevaporated high-temperature liquid working medium in the falling film heat transfer tube A. The mixed high-temperature liquid working medium is transported to the upper gas-liquid separation space of the evaporator-condenser through the high-temperature working medium pump A and the liquid feeding pipe A. The liquid is evenly distributed on the inner wall surface of the falling film heat transfer tube A through the liquid guide A to form a thin liquid film. The thin liquid film is continuously heated by the tube wall during the descent process. The steam rises along the center of the tube and flows into the upper gas-liquid separation space, and the unevaporated liquid falls into the lower liquid storage tank A. The high-temperature low-temperature working medium exhaust gas from the low-temperature compressor enters the outer space of the falling film heat transfer tube A of the evaporator-condenser through the inlet I, releases heat and condenses on the outer wall of the tube, and the condensate flows down along the outer wall and enters the low-temperature liquid storage tank through the outlet I. In order to further enhance heat exchange, the falling film heat transfer tube A adopts an external threaded tube or a low-fin tube, and an appropriate concentration of TiO is added to the liquid storage tank A. 2 , AL 2 O 3 , ZnO and other nanoparticles.

[0023] When the installation height is limited on site, use Figure 3 The evaporator-condenser shown in the figure adopts a heat pipe with a wick. The high-temperature liquid medium depressurized and cooled by the high-temperature expansion valve flows into the liquid storage well ⅡB at the lower part of the cold end of the evaporator-condenser through the inlet Ⅳ, and is mixed with the unevaporated high-temperature liquid medium. The mixed high-temperature liquid medium is transported to the liquid distribution nozzle B in the upper space of the cold end of the evaporator-condenser through the high-temperature medium spray pump B. The liquid is evenly distributed on the outer wall of the cold end of the heat pipe B with a wick through the nozzle to form a thin liquid film. The thin liquid film is continuously heated by the tube wall during the descent process. The steam rises along the space between the tube bundles and flows into the upper space, and the unevaporated liquid falls into the lower liquid storage well ⅡB. The high-temperature low-temperature medium vapor from the low-temperature compressor enters the upper part of the hot end of the heat pipe B with a wick, releases heat and condenses on the outer wall of the hot end of the heat pipe B with a wick, and the condensate flows down along the outer wall of the hot end of the heat pipe and merges into the lower liquid storage well ⅠB, and then connects to the low-temperature liquid storage device through the outlet Ⅲ. In order to further enhance heat transfer, the heat pipe B with liquid absorption core adopts external threaded tube or low fin tube, and an appropriate concentration of TiO is added to the liquid storage well ⅡB at the cold end. 2 、Al 2 O 3 , ZnO and other nanoparticles.

[0024] In order to reduce the heat transfer temperature difference in the evaporator, the utility model adopts Figure 4 , Figure 5 The falling film exhaust gas waste heat recovery evaporator and the heat pipe exhaust gas waste heat recovery falling film evaporator shown in the figure use the falling film heat transfer technology to enhance the boiling heat transfer of the low-temperature liquid working medium from the low-temperature expansion valve.

[0025] like Figure 4 In the falling film type waste heat recovery evaporator shown, the low temperature liquid medium that has been depressurized and cooled by the low temperature expansion valve flows into the lower liquid storage tank C of the evaporator through the inlet VI, and mixes with the unevaporated low temperature liquid medium in the falling film heat transfer tube C. The mixed liquid medium is transported to the upper gas-liquid separation space of the evaporator through the low temperature medium pump C. The liquid is evenly distributed on the inner wall of the falling film heat transfer tube C through the liquid guide C to form a thin liquid film. The thin liquid film is continuously heated by the tube wall during the falling process. The steam rises along the center of the tube and flows into the upper gas-liquid separation space, and the unevaporated liquid falls into the lower liquid storage tank C. The mixed waste gas with a higher temperature from the drying area and cooling area of ​​the re-baking equipment enters the upper space of the falling film heat transfer tube C of the evaporator through the inlet V, flows in the space outside the tube to release heat, and then is discharged from the bottom. In order to further enhance heat exchange, the falling film heat transfer tube C adopts finned tubes, and a baffle C is added on the exhaust gas flow side to enhance exhaust gas disturbance, thereby increasing the exhaust gas heat release coefficient; and an appropriate concentration of TiO is added to the liquid storage tank. 2 、Al 2 O 3 , ZnO and other nanoparticles.

[0026] When the installation height is limited on site, use Figure 5 The heat pipe type exhaust gas waste heat recovery falling film evaporator shown in the figure adopts a heat pipe with a liquid absorption core D in the evaporation. The liquid working medium that has been depressurized and cooled by the low-temperature expansion valve flows into the liquid storage well D at the lower part of the cold end of the evaporator through the inlet VIII, and is mixed with the unevaporated low-temperature liquid working medium. The mixed liquid working medium is transported to the spray nozzle D in the upper space of the cold end of the evaporator through the low-temperature working medium spray pump D. The spray nozzle D evenly distributes liquid on the outer wall surface of the cold end of the heat pipe D with a liquid absorption core to form a thin liquid film. The thin liquid film is continuously heated by the tube wall during the descent process. The steam rises along the space between the tube bundles of the spray nozzle D and flows into the upper space, and the unevaporated liquid falls into the lower liquid storage well D. The mixed waste gas with a higher temperature from the drying area and cooling area of ​​the leaf threshing and re-baking equipment enters the upper part of the hot end of the heat pipe D with a liquid absorption core through the inlet, flows in the space outside the tube to release heat, and then is discharged from the lower inlet VII. In order to further enhance heat exchange, the hot end of the heat pipe D with a liquid absorption core adopts a finned tube, and the cold end can adopt an external threaded tube. A flue gas side baffle D is added on the exhaust gas flow side to increase exhaust gas disturbance, thereby enhancing exhaust gas heat release; and an appropriate concentration of TiO is added to the liquid storage well. 2 , AL 2 O 3 , ZnO nanoparticles.

[0027] The beneficial effects of the utility model are:

[0028] (1) The waste heat from the drying and cooling areas of the tobacco leaf threshing and redrying equipment can be recovered at the same time, which can save energy and reduce the thermal pollution to the factory environment caused by waste heat emissions.

[0029] (2) The heat pump heating system of the utility model is set up according to the partitions of the drying area of ​​the re-drying equipment, and the hot air temperature can be flexibly adjusted according to the needs of re-drying.

[0030] (3) Using cascade heat pump circulation, combined with falling film high-efficiency heat transfer technology and nanoparticle enhancement technology, ensures that the COP of the high-temperature heat pump reaches 4 or above, which can greatly reduce the energy consumption and carbon emissions of redrying, and achieve energy saving, carbon reduction and efficiency improvement of leaf threshing and redrying. At the same time, it can also reduce the equipment footprint and volume, and the equipment size and shape can also better adapt to on-site installation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the utility model;

[0032] Figure 2 The utility model is a schematic diagram of the internal structure of the evaporator-condenser which is a falling film evaporator-condenser;

[0033] Figure 3 The utility model is a schematic diagram of the internal structure of a heat pipe falling film evaporator-condenser;

[0034] Figure 4 The utility model is a schematic diagram of the internal structure of a falling film type exhaust gas waste heat recovery evaporator;

[0035] Figure 5 The utility model is a schematic diagram of the internal structure of a waste gas waste heat recovery evaporator which is a heat pipe type waste gas waste heat recovery evaporator.

[0036] In the figure: 1-circulation fan, 2-drying heater, 3-high temperature liquid storage tank, 4-high temperature compressor, 5-high temperature regenerator, 6-high temperature expansion valve, 7-evaporator-condenser, 8-low temperature liquid storage tank, 9-low temperature compressor, 10-low temperature regenerator, 11-low temperature expansion valve, 12-waste gas waste heat recovery evaporator, 13-exhaust fan, 14-throttle valve, 15-liquid guide A, 16-upper tube sheet A, 17-liquid supply pipe A, 18-falling film heat transfer pipe A, 19-lower tube sheet A, 20-liquid storage tank A, 21-high temperature working fluid pump A, 22-inlet Ⅰ, 23-outlet Ⅰ, 24-inlet Ⅱ, 25-outlet Ⅱ, 26-partition plate B, 27-liquid distribution nozzle B, 28-shell B, 29-with liquid absorption core Heat pipe B, 30-liquid storage well ⅠB, 31-liquid storage well ⅡB, 32-high temperature working fluid spray pump B, 33-inlet Ⅲ, 34-inlet Ⅳ, 35-outlet Ⅲ, 36-liquid guide C, 37-upper tube sheet C, 38-liquid supply pipe C, 39-falling film heat transfer tube C, 40-baffle C, 41-lower tube sheet C, 42-liquid storage tank C, 43-low temperature working fluid pump C , 44-inlet V, 45-inlet VI, 46-outlet IV, 47-outlet V, 48-smoke side baffle D, 49-partition D, 50-distribution nozzle D, 51-shell D, 52-heat pipe with liquid absorption core D, 53-liquid supply pipe D, 54-liquid storage well D, 55-low-temperature grade working fluid spray pump D, 56-inlet VII, 57-inlet VIII, 58-outlet VI. DETAILED DESCRIPTION

[0037] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0038] Example 1

[0039] like Figure 1 As shown, the tobacco leaf threshing, re-drying and heating high-temperature heat pump energy-saving system includes a low-temperature heat pump cycle and a high-temperature heat pump cycle, and the low-temperature heat pump cycle and the high-temperature heat pump cycle are connected through an evaporator-condenser 7;

[0040] The exhaust air in the exhaust duct of the drying area of ​​the re-drying machine and the cooling air in the exhaust duct of the cooling area pass through the low-temperature heat pump circulation exhaust gas waste heat recovery evaporator 12, and the temperature is transferred to the low-temperature circulating working fluid, and then the low-temperature circulating working fluid transfers the heat to the high-temperature circulating working fluid in the high-temperature heat pump circulation. The high-temperature circulating working fluid heats the circulating air in the drying area of ​​the slice / stem machine in the drying heater 2 in the high-temperature heat pump circulation, and the throttle valve 14 is adjusted to make the circulating air temperature form 65°C, 70°C, and 75°C respectively, and the hot air is transported to different areas of the drying area of ​​the re-drying machine.

[0041] The low-temperature heat pump cycle includes a high-temperature regenerator 5, a high-temperature expansion valve 6, an evaporator-condenser 7, a low-temperature liquid storage tank 8, a low-temperature compressor 9, a low-temperature regenerator 10, a low-temperature expansion valve 11, an exhaust gas waste heat recovery evaporator 12, an exhaust fan 13 and several pipelines. The low-temperature circulating working fluid liquid outlet in the low-temperature liquid storage tank 8 is connected in sequence to the low-temperature regenerator 10, the low-temperature expansion valve 11, and the exhaust gas waste heat recovery evaporator 12. The moisture exhaust in the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air duct in the exhaust duct in the cooling area are connected to the waste inlet of the exhaust gas waste heat recovery evaporator 12. After the heat is transferred to the low-temperature circulating working fluid liquid in the exhaust gas waste heat recovery evaporator 12, it is discharged through the exhaust fan 13. The working fluid outlet of the exhaust gas waste heat recovery evaporator 12 is connected in sequence to the low-temperature regenerator 10 and the low-temperature compressor 9 and then enters the evaporator-condenser 7. After the high-temperature working fluid liquid is condensed in the evaporator-condenser 7, it returns to the low-temperature liquid storage tank 8 to complete the low-temperature heat pump cycle.

[0042] The high-temperature heat pump cycle includes a circulating fan 1, a drying heater 2, a high-temperature liquid storage tank 3, a high-temperature compressor 4, a high-temperature regenerator 5, a high-temperature expansion valve 6, an evaporator-condenser 7, a low-temperature liquid storage tank 8, a throttle valve 14 and a number of pipelines. The high-temperature working medium outlet of the evaporator-condenser 7 is sequentially returned to the drying heater 2 through the high-temperature regenerator 5 and the high-temperature compressor 4. In the drying heater 2, the high-temperature circulating working medium transfers the temperature to the circulating air in the drying area of ​​the hot slice / stem machine to form hot air, and the hot air is transported to different areas of the drying area of ​​the re-drying machine through the circulating fan 1; the high-temperature working medium outlet of the drying heater 2 is connected to the high-temperature liquid storage tank 3, and the outlet of the high-temperature liquid storage tank 3 is sequentially connected to the high-temperature regenerator 5 and the high-temperature expansion valve 6 through the throttle valve 14 and then enters the evaporator-condenser 7 to complete the high-temperature heat pump cycle.

[0043] like Figure 2 As shown, the evaporator-condenser 7 is a falling film evaporator-condenser, including a liquid guide A15, an upper tube plate A16, a liquid feed pipe A17, a falling film heat transfer tube A18, a lower tube plate A19, a liquid storage tank A20, a high temperature working fluid pump A21, an inlet I22, an outlet I23, an inlet II24 and an outlet II25. The side of the body is provided with an inlet I22, an outlet I23, an inlet II24 from top to bottom, an outlet II25 is provided on the top of the body, and an upper tube plate A16 and a lower tube plate A17 are provided in the body. Plate A19, a plurality of vertical falling film heat transfer tubes A18 are arranged between the upper tube plate A16 and the lower tube plate A19, the top end of the falling film heat transfer tube A18 is opened, and a liquid guide piece A15 is arranged at the opening, a liquid storage tank A20 is arranged at the bottom of the body, the bottom of the liquid storage tank A20 is connected to the interior of the upper part of the body through a high-temperature working fluid pump A21, low-temperature working fluid steam is introduced into the inlet I22, high-temperature circulating working fluid liquid is introduced into the inlet II24, the outlet I23 is connected to the low-temperature liquid storage tank 8, and the outlet II25 is connected to the high-temperature regenerator 5.

[0044] like Figure 4 As shown, the exhaust gas waste heat recovery evaporator 12 is a falling film evaporator, including a liquid guide C36, an upper tube plate C37, a liquid feed pipe C38, a falling film heat transfer tube C39, a baffle C40, a lower tube plate C41, a liquid storage tank C42, a low-temperature working fluid pump C43, an inlet V44, an inlet VI45, an outlet IV46 and an outlet V47. The side of the body is provided with an inlet V44, an outlet IV46, and an inlet VI45 from top to bottom, respectively, and the top of the body is provided with an outlet V47. The body is provided with an upper tube plate C37 and a lower tube plate C41 which are located horizontally on the upper side. The upper tube plate C37 and the lower tube plate C41 are provided. Room 41 is provided with a plurality of vertical falling film heat transfer tubes C39, the top end of the falling film heat transfer tube C39 is opened, a plurality of baffles C40 are arranged outside the falling film heat transfer tube C39, a liquid guide piece C36 is arranged at the opening, a liquid storage tank C42 is arranged at the bottom of the interior of the device body, the bottom of the liquid storage tank C42 is connected to the interior of the upper part of the device body through a low-temperature working fluid pump C43, the inlet V44 is connected to the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air in the exhaust duct in the cooling area, the inlet VI45 is connected to the low-temperature circulating working fluid liquid, the outlet IV46 is connected to the exhaust fan 13, and the outlet V47 is connected to the low-temperature heat regenerator 10.

[0045] The above-mentioned low-temperature grade working fluid is the R410A circulating working fluid with a lower boiling point, and the high-temperature grade working fluid is the R245fa circulating working fluid with a higher boiling point.

[0046] TiO is added to the liquid storage tank of the above evaporator-condenser 7 and the exhaust gas waste heat recovery evaporator 12. 2 Nanoparticles further enhance heat transfer.

[0047] Depending on the chemical properties, temperature, pressure and possible corrosiveness of the circulating working fluid, the system connecting pipes can be made of copper pipes, stainless steel pipes, galvanized steel pipes, etc.

[0048] The compressor used is a screw heat pump compressor.

[0049] All pipes are well insulated with foam rubber-plastic insulation casing.

[0050] Example 2

[0051] like Figure 1 As shown, the tobacco leaf threshing, re-drying and heating high-temperature heat pump energy-saving system includes a low-temperature heat pump cycle and a high-temperature heat pump cycle, and the low-temperature heat pump cycle and the high-temperature heat pump cycle are connected through an evaporator-condenser 7;

[0052] The exhaust air in the exhaust duct of the drying area of ​​the re-drying machine and the cooling air in the exhaust duct of the cooling area pass through the low-temperature heat pump circulation exhaust gas waste heat recovery evaporator 12, and the temperature is transferred to the low-temperature circulating working fluid, and then the low-temperature circulating working fluid transfers the heat to the high-temperature circulating working fluid in the high-temperature heat pump circulation. The high-temperature circulating working fluid heats the circulating air in the drying area of ​​the slice / stem machine in the drying heater 2 in the high-temperature heat pump circulation, and the throttle valve 14 is adjusted to make the circulating air temperature form 65°C, 68°C, and 73°C respectively, and the hot air is transported to different areas of the drying area of ​​the re-drying machine.

[0053] The low-temperature heat pump cycle includes a high-temperature regenerator 5, a high-temperature expansion valve 6, an evaporator-condenser 7, a low-temperature liquid storage tank 8, a low-temperature compressor 9, a low-temperature regenerator 10, a low-temperature expansion valve 11, an exhaust gas waste heat recovery evaporator 12, an exhaust fan 13 and several pipelines. The low-temperature circulating working fluid liquid outlet in the low-temperature liquid storage tank 8 is connected in sequence to the low-temperature regenerator 10, the low-temperature expansion valve 11, and the exhaust gas waste heat recovery evaporator 12. The moisture exhaust in the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air duct in the exhaust duct in the cooling area are connected to the waste inlet of the exhaust gas waste heat recovery evaporator 12. After the heat is transferred to the low-temperature circulating working fluid liquid in the exhaust gas waste heat recovery evaporator 12, it is discharged through the exhaust fan 13. The working fluid outlet of the exhaust gas waste heat recovery evaporator 12 is connected in sequence to the low-temperature regenerator 10 and the low-temperature compressor 9 and then enters the evaporator-condenser 7. After the high-temperature working fluid liquid is condensed in the evaporator-condenser 7, it returns to the low-temperature liquid storage tank 8 to complete the low-temperature heat pump cycle.

[0054] The high-temperature heat pump cycle includes a circulating fan 1, a drying heater 2, a high-temperature liquid storage tank 3, a high-temperature compressor 4, a high-temperature regenerator 5, a high-temperature expansion valve 6, an evaporator-condenser 7, a low-temperature liquid storage tank 8, a throttle valve 14 and a number of pipelines. The high-temperature working medium outlet of the evaporator-condenser 7 is sequentially returned to the drying heater 2 through the high-temperature regenerator 5 and the high-temperature compressor 4. In the drying heater 2, the high-temperature circulating working medium transfers the temperature to the circulating air in the drying area of ​​the hot slice / stem machine to form hot air, and the hot air is transported to different areas of the drying area of ​​the re-drying machine through the circulating fan 1; the high-temperature working medium outlet of the drying heater 2 is connected to the high-temperature liquid storage tank 3, and the outlet of the high-temperature liquid storage tank 3 is sequentially connected to the high-temperature regenerator 5 and the high-temperature expansion valve 6 through the throttle valve 14 and then enters the evaporator-condenser 7 to complete the high-temperature heat pump cycle.

[0055] like Figure 3As shown, the evaporator-condenser 7 is a heat pipe evaporator-condenser, including a partition B26, a liquid distribution nozzle B27, a shell B28, a heat pipe with a liquid absorption core B29, a liquid storage well IB30, a liquid storage well IIB31, a high-temperature working fluid spray pump B32, an inlet III33, an inlet IV34 and an outlet III35. A partition B26 is provided inside the shell B28 to separate a plurality of horizontally placed heat pipes with a liquid absorption core B29 into a hot end and a cold end. An inlet III33 is provided at the top of the hot end, and a liquid storage well IB30 and an outlet III34 are provided at the bottom of the hot end in sequence. 35, a liquid distribution nozzle B27 is provided at the cold end and located at the upper part of the inner part of the shell B28, a liquid storage well ⅡB31 is provided at the bottom of the cold end, an inlet Ⅳ34 is provided at the side of the liquid storage well ⅡB31, the bottom of the liquid storage well ⅡB31 is connected to the liquid distribution nozzle B27 through a high-temperature-grade working fluid spray pump B32, low-temperature working fluid steam is introduced into the inlet Ⅲ33, the outlet Ⅲ35 is connected to the low-temperature-grade liquid storage tank 8, and the high-temperature circulating working fluid liquid is introduced into the inlet Ⅳ34. A high-temperature circulating working fluid steam outlet is provided at the top of the cold end, and the high-temperature circulating working fluid steam outlet is connected to the warm-grade heat regenerator 5.

[0056] like Figure 5 As shown, the exhaust gas waste heat recovery evaporator 12 is a heat pipe evaporator, including a flue gas side baffle D48, a partition D49, a spray nozzle D50, a shell D51, a heat pipe with a liquid wick D52, a liquid supply pipe D53, a liquid storage well D54, a low-temperature working fluid spray pump D55, an inlet VII56, an inlet VIII57 and an outlet VI58. A heat pipe with a liquid wick D52 is arranged inside the shell D51, and a plurality of horizontal heat pipes with a liquid wick D52 are separated into a hot end and a cold end. An inlet VII56 is arranged at the top of the hot end, and outlets VI58 are arranged at the bottom of the hot end in sequence. The hot end is provided with a plurality of The dry flue gas side baffle D48, the cold end and the upper part of the shell D51 are provided with a distribution nozzle D50, the bottom of the cold end is provided with a liquid storage well D54, the side of the liquid storage well D54 is provided with an inlet VIII 57, the bottom of the liquid storage well D54 is connected to the distribution nozzle D50 through a low-temperature working fluid spray pump D55, the inlet VII 56 is introduced into the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air in the exhaust duct in the cooling area, the inlet VIII 57 is introduced into the low-temperature circulating working fluid liquid, the outlet VI 58 is connected to the exhaust fan 13, and the outlet low-temperature circulating working fluid steam outlet at the top of the cold end is connected to the low-temperature reheater 10.

[0057] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A high-temperature heat pump energy-saving system for heating tobacco leaf threshing, re-baking and drying, characterized in that: It includes a low-temperature heat pump cycle and a high-temperature heat pump cycle, wherein the low-temperature heat pump cycle and the high-temperature heat pump cycle are connected via an evaporator-condenser (7); The moisture exhaust air in the moisture exhaust duct of the drying area of ​​the re-drying machine and the cooling air in the exhaust duct of the cooling area pass through the waste heat recovery evaporator (12) of the low-temperature stage heat pump circulation exhaust gas, and the temperature is transferred to the low-temperature circulation working medium. Then the low-temperature circulation working medium transfers the heat to the high-temperature circulation working medium in the high-temperature stage heat pump circulation. The high-temperature circulation working medium heats the circulating air in the drying area of ​​the slice / stem machine in the drying heater (2) of the high-temperature stage heat pump circulation. By adjusting the throttle valve (14), the circulating air temperature is formed into 65°C-75°C hot air and transported to different areas of the drying area of ​​the re-drying machine.

2. The high-temperature heat pump energy-saving system for heating tobacco leaf threshing, re-baking and drying according to claim 1 is characterized by: The low-temperature heat pump cycle comprises a high-temperature regenerator (5), a high-temperature expansion valve (6), an evaporator-condenser (7), a low-temperature liquid storage tank (8), a low-temperature compressor (9), a low-temperature regenerator (10), a low-temperature expansion valve (11), an exhaust gas waste heat recovery evaporator (12), an exhaust fan (13) and a plurality of pipelines. The low-temperature circulating working fluid liquid outlet in the low-temperature liquid storage tank (8) is connected in sequence to the low-temperature regenerator (10), the low-temperature expansion valve (11), the exhaust gas waste heat recovery evaporator (12), and the exhaust fan (13) in the drying area of ​​the reheating machine. The cooling air duct in the exhaust air duct of the exhaust zone is connected to the waste inlet of the exhaust gas waste heat recovery evaporator (12). After the heat is transferred to the low-temperature circulating working fluid liquid in the exhaust gas waste heat recovery evaporator (12), it is discharged through the exhaust fan (13). The working fluid outlet of the exhaust gas waste heat recovery evaporator (12) is connected to the low-temperature stage regenerator (10) and the low-temperature stage compressor (9) in sequence and then enters the evaporator-condenser (7). After the high-temperature working fluid liquid is condensed in the evaporator-condenser (7), it returns to the low-temperature stage liquid storage tank (8), completing the low-temperature stage heat pump cycle.

3. The high-temperature heat pump energy-saving system for heating tobacco leaf threshing, re-baking and drying according to claim 1 is characterized in that: The high-temperature heat pump cycle comprises a circulating fan (1), a drying heater (2), a high-temperature liquid storage tank (3), a high-temperature compressor (4), a high-temperature regenerator (5), a high-temperature expansion valve (6), an evaporator-condenser (7), a low-temperature liquid storage tank (8), a throttle valve (14) and a plurality of pipelines. The high-temperature working medium outlet of the evaporator-condenser (7) passes through the high-temperature regenerator (5) and the high-temperature compressor (4) in sequence and returns to the drying heater (2). In the drying heater (2), the high-temperature circulating working medium transfers the temperature to the circulating air in the drying area of ​​the hot slice / stem machine to form hot air. The hot air is transported to different areas of the drying area of ​​the re-drying machine through the circulating fan (1); the high-temperature working medium outlet of the drying heater (2) is connected to the high-temperature liquid storage tank (3), and the outlet of the high-temperature liquid storage tank (3) is connected to the high-temperature regenerator (5) and the high-temperature expansion valve (6) in sequence through the throttle valve (14) and then enters the evaporator-condenser (7), completing the high-temperature heat pump cycle.

4. The tobacco threshing, re-baking and drying high-temperature heat pump energy-saving system according to claim 2 or 3, characterized in that: The evaporator-condenser (7) is a falling film evaporator-condenser, comprising a liquid guide member A (15), an upper tube plate A (16), a liquid feed pipe A (17), a falling film heat transfer tube A (18), a lower tube plate A (19), a liquid storage tank A (20), a high temperature working fluid pump A (21), an inlet I (22), an outlet I (23), an inlet II (24) and an outlet II (25), wherein the inlet I (22), the outlet I (23) and the inlet II (24) are respectively arranged on the side of the body from top to bottom, the outlet II (25) is arranged on the top of the body, and the upper tube plate A (16) and the lower tube plate A (23) are arranged on the inside of the body. A plurality of vertical falling film heat transfer tubes A (18) are arranged between the tube sheet A (19), the upper tube sheet A (16) and the lower tube sheet A (19), the top end of the falling film heat transfer tube A (18) is open, and a liquid guide member A (15) is arranged at the opening, a liquid storage tank A (20) is arranged at the bottom of the body, the bottom of the liquid storage tank A (20) is connected to the interior of the upper part of the body through a high-temperature working fluid pump A (21), low-temperature working fluid steam is introduced into the inlet I (22), high-temperature circulating working fluid liquid is introduced into the inlet II (24), the outlet I (23) is connected to the low-temperature liquid storage tank (8), and the outlet II (25) is connected to the high-temperature regenerator (5).

5. The tobacco threshing, re-baking and drying high-temperature heat pump energy-saving system according to claim 2 or 3, characterized in that: The evaporator-condenser (7) is a heat pipe type evaporator-condenser, comprising a partition plate B (26), a liquid distribution nozzle B (27), a shell B (28), a heat pipe with a liquid absorption core B (29), a liquid storage well IB (30), a liquid storage well IIB (31), a high-temperature working fluid spray pump B (32), an inlet III (33), an inlet IV (34) and an outlet III (35). The shell B (28) is provided with a partition plate B (26) inside to separate a plurality of horizontally arranged heat pipes with a liquid absorption core B (29) into a hot end and a cold end. The top of the hot end is provided with an inlet III (33), and the bottom of the hot end is provided with a liquid storage well IB (30) and an outlet III (35) in sequence. Ⅲ (35), a liquid distribution nozzle B (27) is provided at the cold end and located at the upper part of the inner part of the shell B (28), a liquid storage well ⅡB (31) is provided at the bottom of the cold end, an inlet Ⅳ (34) is provided at the side of the liquid storage well ⅡB (31), the bottom of the liquid storage well ⅡB (31) is connected to the liquid distribution nozzle B (27) through a high-temperature working fluid spray pump B (32), low-temperature working fluid steam is introduced into the inlet Ⅲ (33), the outlet Ⅲ (35) is connected to the low-temperature liquid storage tank (8), the inlet Ⅳ (34) is introduced into the high-temperature circulating working fluid liquid, a high-temperature circulating working fluid steam outlet is provided at the top of the cold end, and the high-temperature circulating working fluid steam outlet is connected to the temperature-stage regenerator (5).

6. The high-temperature heat pump energy-saving system for heating tobacco leaf threshing, re-baking and drying according to claim 2 is characterized by: The exhaust gas waste heat recovery evaporator (12) is a falling film evaporator, comprising a liquid guide member C (36), an upper tube plate C (37), a liquid feed pipe C (38), a falling film heat transfer pipe C (39), a baffle C (40), a lower tube plate C (41), a liquid storage tank C (42), a low temperature working fluid pump C (43), an inlet V (44), an inlet VI (45), an outlet IV (46) and an outlet V (47), the side of the evaporator body being provided with an inlet V (44), an outlet IV (46) and an inlet VI (45) from top to bottom, the top of the evaporator body being provided with an outlet V (47), the interior of the evaporator body being provided with an upper tube plate C (37) and a lower tube plate C (41) being arranged transversely and located on the upper side, the upper tube plate C (37) and A plurality of vertical falling film heat transfer tubes C (39) are arranged between the lower tube plates C (41). The top ends of the falling film heat transfer tubes C (39) are open. A plurality of baffles C (40) are arranged outside the falling film heat transfer tubes C (39). A liquid guide member C (36) is arranged at the opening. A liquid storage tank C (42) is arranged at the bottom of the body. The bottom of the liquid storage tank C (42) is connected to the interior of the upper part of the body through a low-temperature working fluid pump C (43). The inlet V (44) is connected to the exhaust air in the exhaust air duct of the drying zone of the re-drying machine and the cooling air in the exhaust air duct of the cooling zone. The inlet VI (45) is connected to the low-temperature circulating working fluid liquid. The outlet IV (46) is connected to the exhaust fan (13). The outlet V (47) is connected to the low-temperature regenerator (10).

7. The high-temperature heat pump energy-saving system for heating tobacco leaf threshing, re-baking and drying according to claim 2 is characterized by: The exhaust gas waste heat recovery evaporator (12) is a heat pipe evaporator, comprising a flue gas side baffle D (48), a partition D (49), a spray nozzle D (50), a shell D (51), a heat pipe with a liquid wick D (52), a liquid supply pipe D (53), a liquid storage well D (54), a low-temperature working fluid spray pump D (55), an inlet VII (56), an inlet VIII (57) and an outlet VI (58). The shell D (51) is provided with a heat pipe with a liquid wick D (52) inside, and a plurality of horizontally placed heat pipes with a liquid wick D (52) are separated into a hot end and a cold end. The top of the hot end is provided with an inlet VII (56), and the bottom of the hot end is provided with outlets VI (58) in sequence. The hot end is provided with A plurality of smoke side baffles D (48) are provided at the cold end and at the upper part of the inner part of the shell D (51). A liquid storage well D (54) is provided at the bottom of the cold end. An inlet VIII (57) is provided at the side of the liquid storage well D (54). The bottom of the liquid storage well D (54) is connected to the shower nozzle D (50) through a low-temperature-grade working fluid spray pump D (55). The inlet VII (56) is connected to the moisture exhaust duct in the drying area of ​​the re-drying machine and the cooling air in the exhaust duct in the cooling area. The inlet VIII (57) is connected to the low-temperature circulating working fluid liquid. The outlet VI (58) is connected to the exhaust fan (13). The outlet low-temperature circulating working fluid steam outlet at the top of the cold end is connected to the low-temperature-grade regenerator (10).

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