Distillation or evaporation process heat recovery device

Abstract

The utility model relates to a heat recovery device in a distillation or evaporation process. The heat recovery device comprises an evaporator, a vacuum pump and a liquid storage tank, an evaporator and a vacuum pump are added in a conventional distillation or evaporation process. And water vapor enters the jacket of the distillation kettle through the gas inlet pipe and heats the organic solvent in the distillation kettle through the jacket. Therefore, the organic solvent in the distillation kettle is vaporized, and the vaporized organic gas enters the evaporator for heat exchange. Meanwhile, vacuum is generated in the evaporator through the vacuum pump, the pressure in a heat exchange channel in the evaporator is low in the vacuum state, and when the pressure is lower than the saturated vapor pressure corresponding to the water temperature at the moment, the water is subjected to phase change and absorbs heat to be vaporized. Vaporized water vapor enters the jacket through the vacuum pump via the fifth pipeline and the gas inlet pipe, and the organic solvent in the distillation kettle is heated again, so that the recovery of most heat can be realized without contact with the organic gas. In the process, insufficient heat is supplemented through a heating pipeline on original equipment.

Description

Technical Field

[0001] This utility model relates to a heat recovery device, specifically a heat recovery device for a distillation or evaporation process. Background Technology

[0002] Currently, in distillation or evaporation processes in the pharmaceutical and chemical industries, most of the heat is lost as the organic solvent evaporates, resulting in a significant waste of heat.

[0003] Distillation or evaporation processes are typically major energy-consuming stages in factories. While MVR (Mechanical Vapor Recycling) technology exists for heat recovery, it's primarily used for steam recovery and has limitations in distillation or evaporation. Distillation or evaporation requires pressurizing and heating organic gases, not water vapor. Using a high-speed centrifuge for pressurization can lead to static electricity buildup, which is undesirable in chemical processes, and high-speed centrifuges are expensive. Reciprocating or screw compressors, on the other hand, use lubricating oil that can contaminate the organic gases, affecting the quality of the recovered solvent. While heat pump technology can recover heat in these processes, it requires converting the recovered heat into water vapor, a cumbersome and costly process. Currently, heat pump technology is limited by temperature limits and is rarely used in distillation or evaporation processes, primarily found in civilian applications.

[0004] Therefore, to address the problems existing in the current distillation or evaporation process, improvements are made to the existing distillation or evaporation process. Utility Model Content

[0005] The main objective of this invention is to provide a technology that can achieve heat recovery without contact with organic gases.

[0006] To achieve the above objectives, this utility model provides a heat recovery device for a distillation or evaporation process, characterized in that it includes a vacuum pump, a storage tank, and an evaporator. The evaporator is connected to both the storage tank and the vacuum pump. The evaporator is used to exchange heat and condense the distilled organic solvent to recover heat. The vacuum pump provides a negative pressure environment to the evaporator so that the water supplied from the storage tank to the evaporator is vaporized. The vacuum pump uses the vapor in the evaporator to heat the distillation or evaporation vessel. The condensate after the vapor exchange heat is stored in the storage tank.

[0007] Preferably, it further includes a distillation or evaporation vessel; the distillation or evaporation vessel has a heat exchange device, an inlet pipe is provided on one side of the upper end of the heat exchange device, a drain pipe is provided at the lower end of the heat exchange device, the drain pipe is connected to the inlet of the storage tank through a first pipe, the outlet of the storage tank is connected to the inlet of the evaporator through a second pipe, the outlet of the distillation or evaporation vessel is connected to the inlet pipe of the evaporator through a third pipe, an outlet pipe is provided on one side of the upper end of the evaporator, a liquid outlet pipe is provided on one side of the lower end of the evaporator, the upper end of the evaporator is connected to the inlet of the vacuum pump through a fourth pipe, and the outlet of the vacuum pump is connected to the upper end of the inlet pipe through a fifth pipe.

[0008] A preferred embodiment is that control valves are installed on the air inlet pipe, liquid outlet pipe, liquid discharge pipe, second pipe, third pipe, and sixth pipe.

[0009] In a preferred embodiment, the air outlet pipe is connected to a heat exchanger, the upper end of the heat exchanger is provided with a cooling water inlet and a cooling water outlet, the end of the heat exchanger is provided with a first outlet, and the lower side of the heat exchanger is provided with a second outlet.

[0010] In a preferred embodiment, a collection tank is provided on one side of the storage tank, and the outlet pipe and the second outlet are respectively connected to the collection tank through pipes.

[0011] In a preferred embodiment, the first outlet is connected to a discharge pipe, and a valve structure is provided at the upper end of the discharge pipe.

[0012] A preferred embodiment further includes a compressor, the inlet of which is connected to a fifth pipe, and the outlet of which is connected to the upper end of the intake pipe via a sixth pipe.

[0013] In a preferred embodiment, the distillation vessel or evaporation vessel is a vacuum vessel or an atmospheric pressure vessel.

[0014] A preferred embodiment is that the heat exchange device is a jacket, a coil, or a boiling device.

[0015] The beneficial effects of this invention are as follows: By adding an evaporator and a vacuum pump to a conventional distillation or evaporation process, water vapor enters the jacket of the distillation vessel through the inlet pipe. The water vapor heats the organic solvent in the distillation vessel, causing it to vaporize. The vaporized organic gas then enters the evaporator for heat exchange. Simultaneously, the vacuum pump creates a vacuum within the evaporator. Under vacuum, the pressure in the heat exchange tubes of the evaporator is low. When the pressure is below the saturated vapor pressure corresponding to the water temperature, water undergoes a phase change, absorbing heat and vaporizing. The vaporized water vapor then enters the jacket through the fifth pipe and the inlet pipe via the vacuum pump, further heating the organic solvent in the distillation vessel. This allows for the recovery of most of the heat without contact with the organic gas. Any insufficient heat is supplemented by the heating pipes in the original equipment. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of a heat recovery device for a distillation or evaporation process according to this utility model. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] Example 1:

[0020] like Figure 1 As shown, the system includes a vacuum pump 30, a storage tank 50, and an evaporator 20. The evaporator 20 is connected to both the storage tank 50 and the vacuum pump 30. The evaporator 20 is used to exchange heat and condense the evaporated organic solvent to recover heat. The vacuum pump 30 provides a negative pressure environment to the evaporator 20 so that the water supplied from the storage tank 50 to the evaporator 20 is vaporized. The vacuum pump 30 uses the vapor in the evaporator 20 to heat the distillation or evaporation vessel. The condensate after the vapor exchange heat is stored in the storage tank 50.

[0021] Here, an evaporator 20 and a vacuum pump 30 are added to a conventional distillation or evaporation process. Water vapor enters the jacket 11 of the distillation vessel 10 through the inlet pipe 12, heating the organic solvent in the vessel. This vaporizes the organic solvent, and the vaporized organic gas enters the evaporator 20 for heat exchange. Simultaneously, the vacuum pump 30 creates a vacuum within the evaporator 20. Under vacuum, the pressure in the heat exchange channels of the evaporator 20 is low. When the pressure is below the saturated vapor pressure corresponding to the water temperature, water undergoes a phase change, absorbing heat and vaporizing. The vaporized water vapor is then pressurized and heated by the vacuum pump 30, entering the jacket 11 through the fifth pipe 55 and the inlet pipe 12, again heating the organic solvent in the distillation vessel 10. In this way, most of the heat is recovered without contact with the organic gas. Any insufficient heat is supplemented by heating pipes on the original equipment (e.g., a branch upstream of the inlet pipe 12 provides additional heating steam).

[0022] Example 2:

[0023] like Figure 1 As shown, this utility model provides a heat recovery device for a distillation process, including a distillation kettle 10, an evaporator 20, a vacuum pump 30, and a liquid storage tank 50;

[0024] The distillation vessel 10 has a heat exchange device 11. An air inlet pipe 12 is provided on one side of the upper end of the heat exchange device 11, and a drain pipe 14 is provided on the lower end of the heat exchange device 11. The drain pipe 14 is connected to the inlet of the storage tank 50 through a first pipe 13. The outlet of the storage tank 50 is connected to the liquid inlet of the evaporator 20 through a second pipe 51. The air outlet at the upper end of the distillation or evaporation vessel 10 is connected to the air inlet pipe of the evaporator 20 through a third pipe 52. An air outlet pipe 21 is provided on one side of the upper end of the evaporator 20, and a liquid outlet pipe 22 is provided on one side of the lower end of the evaporator 20. The upper end of the evaporator 20 is connected to the inlet of the vacuum pump 30 through a fourth pipe 54, and the outlet of the vacuum pump 30 is connected to the upper end of the air inlet pipe 11 through a fifth pipe 55.

[0025] Working process: Water vapor enters the heat exchanger 11 through the inlet pipe 12. The water vapor heats the organic solvent in the distillation or evaporation kettle 10 as it passes through the heat exchanger 11. The organic solvent absorbs heat and vaporizes. The organic gas enters the evaporator 20 through the outlet and the third pipe 52. After the water vapor in the heat exchanger 11 cools down, it forms condensate and is discharged into the storage tank 50. The condensate enters the heat exchange channel in the evaporator 20. The vacuum pump 30 is started, and a vacuum (or negative pressure) is created in the evaporator 20. The water in the heat exchange tubes of the evaporator 20 reaches its boiling point and boils. Vaporization occurs when the organic gas exchanges heat with the water medium in the heat exchange tube. The steam then enters the heat exchange equipment 11 again through the fourth pipe 54, vacuum pump 30, and fifth pipe 55 via the inlet pipe 12 to heat the organic solvent in the distillation kettle 10. After heat exchange in the evaporator 20, the organic solvent formed by the organic gas is discharged from the liquid outlet pipe 22, while the remaining organic gas is discharged from the gas outlet pipe 21 on one side of the evaporator 20 to the heat exchanger 60 and condenses again to form organic solvent. In this way, heat recovery can be achieved without contact with the organic gas.

[0026] In addition, the liquid formed after the water vapor condenses in the heat exchanger 11 enters the storage tank 50 through the drain pipe and the first pipe 13. Then, according to the level of the cooling water in the heat exchange tubes in the evaporator 20, the cooling water in the storage tank 50 is continuously replenished into the heat exchange tubes in the evaporator 20 through the second pipe 51.

[0027] Although some heat needs to be input for startup and removed by organic non-condensable steam, most of the heat is recycled.

[0028] In addition, the condensate enters the heat exchange tubes of the evaporator to exchange heat with the organic gases. The evaporator is existing technology, so it will not be described in detail here.

[0029] Preferably, control valves 90 are provided on the air inlet pipe 12, the liquid outlet pipe 14, the liquid outlet pipe 22, the second pipe 51, the third pipe 52, and the sixth pipe 56. The control valves 90 are used to control the opening, closing, or adjustment of the opening degree of the air inlet pipe, the liquid outlet pipe, the second pipe, the third pipe, and the sixth pipe.

[0030] Preferably, the air outlet pipe 21 is connected to the heat exchanger 60, the upper end of the heat exchanger 60 is provided with a cooling water inlet 61 and a cooling water outlet 62, the end of the heat exchanger 60 is provided with a first outlet 63, and the lower side of the heat exchanger is provided with a second outlet 64.

[0031] The remaining organic gas in the evaporator 20 enters the heat exchanger 60 through the outlet pipe 21. The organic gas is condensed again by the cooling water to form an organic solvent, which is then discharged through the second outlet 64. The remaining organic non-condensable gas is discharged from the first outlet 63.

[0032] Preferably, a collection tank (not shown in the attached drawings) is provided on one side of the storage tank 50, and the outlet pipe 22 and the second outlet 64 are respectively connected to the collection tank through pipes.

[0033] When the organic gas in the evaporator 20 condenses and forms organic solvent, it is discharged from the liquid outlet pipe 22 into the collection tank. At the same time, the organic solvent condensed in the heat exchanger 60 is also discharged into the collection tank through the second outlet 64, thus completing the collection of organic solvent.

[0034] Preferably, the first outlet 63 is connected to the discharge pipe 631, and the upper end of the discharge pipe 631 is provided with a valve structure.

[0035] Organic non-condensable gases are discharged through discharge pipe 631.

[0036] Preferably, the system further includes a compressor 40, the inlet of which is connected to a fifth pipe 55, and the outlet of which is connected to the upper end of the intake pipe 12 via a sixth pipe 56.

[0037] A compressor can compress water vapor, thereby increasing its temperature and pressure. If the required temperature is not high, a compressor is not necessary; a vacuum pump can suffice. The compressor should be used according to actual needs.

[0038] In summary, the technical effects of this utility model are as follows: the water in the heat exchange tube of the evaporator is vaporized under negative pressure by a vacuum pump to quickly remove the heat of the organic gas, and the organic gas is recovered after condensation; while the heat is returned to the distillation or evaporation kettle jacket by the vacuum pump to continue heating and distillation.

[0039] Water vapor can be added through the air inlet pipe to ensure the normal operation of the distillation or evaporation vessel.

[0040] The distillation vessel or evaporation vessel is a vacuum vessel or an atmospheric pressure vessel.

[0041] The heat exchange equipment is a jacket, a coil, or a boiling device.

[0042] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A heat recovery device for a distillation or evaporation process, characterized in that, The system includes a vacuum pump, a storage tank, and an evaporator. The evaporator is connected to both the storage tank and the vacuum pump. The evaporator is used to exchange heat and condense the distilled organic solvent to recover heat. The vacuum pump provides a negative pressure environment to the evaporator so that the water supplied from the storage tank to the evaporator can be vaporized. The vacuum pump uses the vapor in the evaporator to heat the distillation or evaporation vessel. The condensate after the vapor exchanges heat and is condensed is stored in the storage tank.

2. The heat recovery device for distillation or evaporation processes according to claim 1, characterized in that, It also includes a distillation vessel; The distillation or evaporation vessel has a heat exchange device. An air inlet pipe is provided on one side of the upper end of the heat exchange device, and a liquid drain pipe is provided at the lower end of the heat exchange device. The liquid drain pipe is connected to the inlet of the liquid storage tank through a first pipe. The outlet of the liquid storage tank is connected to the liquid inlet of the evaporator through a second pipe. The air outlet at the upper end of the distillation vessel is connected to the air inlet pipe of the evaporator through a third pipe. An air outlet pipe is provided on one side of the upper end of the evaporator, and a liquid outlet pipe is provided on one side of the lower end of the evaporator. The upper end of the evaporator is connected to the inlet of the vacuum pump through a fourth pipe, and the outlet of the vacuum pump is connected to the upper end of the air inlet pipe through a fifth pipe.

3. The heat recovery device for distillation or evaporation processes according to claim 2, characterized in that, Control valves are installed on the air inlet pipe, liquid outlet pipe, liquid discharge pipe, second pipe, third pipe, and sixth pipe.

4. The heat recovery device for distillation or evaporation processes according to claim 2, characterized in that, The air outlet pipe is connected to the heat exchanger. The upper end of the heat exchanger is provided with a cooling water inlet and a cooling water outlet. The end of the heat exchanger is provided with a first outlet, and the lower side of the heat exchanger is provided with a second outlet.

5. The heat recovery device for distillation or evaporation processes according to claim 4, characterized in that, A collection tank is provided on one side of the storage tank, and the outlet pipe and the second outlet are respectively connected to the collection tank through pipes.

6. The heat recovery device for distillation or evaporation processes according to claim 4, characterized in that, The first outlet is connected to the discharge pipe, and a valve structure is provided at the upper end of the discharge pipe.

7. The heat recovery device for distillation or evaporation processes according to claim 6, characterized in that, It also includes a compressor, the inlet of which is connected to a fifth pipe, and the outlet of which is connected to the upper end of the intake pipe via a sixth pipe.

8. The heat recovery device for distillation or evaporation processes according to claim 2, characterized in that, The distillation vessel or evaporation vessel is a vacuum vessel or an atmospheric pressure vessel.

9. The heat recovery device for distillation or evaporation process according to claim 2, characterized in that, The heat exchange equipment is a jacket, a coil, or a boiling device.

Images