Energy-saving process cold and hot water system applied to CO2 supercritical extraction
By using a combination of heat pump unit, solar collector and steam heating unit in the CO2 supercritical extraction process, the problem of high energy consumption in the traditional process is solved, and the energy saving and cost reduction of the process are achieved.
Patent Information
- Application Number
- CN202421027467.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The traditional CO2 supercritical extraction process consumes a lot of energy, resulting in higher production costs.
An energy-saving process hot and cold water system for CO2 supercritical extraction is designed. A heat pump unit is used to recover low-grade heat energy from the refrigeration unit. It is combined with a solar collector and a steam heating unit to reduce steam consumption and provide chilled water and Hot water.
By recycling low-grade heat energy and using solar energy for heat storage and steam heating, energy consumption is significantly reduced, production costs are reduced, and energy saving and consumption reduction in the CO2 supercritical extraction process are achieved.
Smart Images
Figure CN222378497U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of energy saving and consumption reduction, in particular to a method for applying to CO 2 Energy-saving process cold and hot water system for supercritical extraction. Background Art
[0002] Supercritical fluid extraction technology is a new separation technology that uses fluids above the critical temperature and critical pressure to have good solubility for many substances, and to extract and separate substances. Supercritical fluids have the characteristics of both gas and liquid, that is, the density is close to that of liquids, while the viscosity and diffusion coefficient are similar to those of gases. Therefore, it not only has an extraction capacity equivalent to that of liquid solvents, but also has excellent mass transfer performance. Supercritical fluid extraction technology utilizes the special properties of supercritical fluids to make them contact with the solid or liquid mixture to be separated under high pressure conditions, adjust the operating pressure and temperature of the system, extract the desired substances, and then reduce the density of the supercritical fluid by reducing the pressure or increasing the temperature, so that the extract can be separated. Solvents used as supercritical fluids include carbon dioxide, ethane, ethylene, propane, propylene, methanol, ethanol, water, etc. Among them, CO 2 Due to its non-toxic, harmless, strong solubility, low cost and other advantages, it has become the preferred industrial extraction agent. Currently, supercritical carbon dioxide has been widely used in many fields such as food, medicine, flavors and fragrances. Traditional CO 2 The supercritical extraction process uses 7 / 12℃ chilled water provided by the refrigeration unit to 2 The booster pump is used to cool and extract the CO 2 The hot water provided by the steam-hot water plate heat exchanger is used to condense the CO 2 The whole process consumes a lot of energy, resulting in high production costs. Summary of the invention
[0003] In order to solve the above problems, the utility model provides a CO 2 The energy-saving process cold and hot water system of supercritical extraction can adopt the following technical solutions:
[0004] The utility model is applied to CO 2 Energy-saving process cold and hot water systems for supercritical extraction, including CO 2 The supercritical extraction device also includes a refrigeration unit, wherein the evaporation side of the refrigeration unit is provided with a 2The chilled water circulation pipeline connected to the equipment to be cooled in the supercritical extraction device, the condensing side of the refrigeration unit is provided with a cooling water circulation pipeline, the cooling water circulation pipeline includes a first branch connected to the cooling tower and a second branch connected to the evaporation side of the heat pump unit, the condensing side of the heat pump unit is provided with a first hot water circulation pipeline connected to the hot water storage tank, the hot water storage tank is also provided with a second hot water circulation pipeline connected to the solar collector, and a second hot water circulation pipeline connected to the CO 2 A third hot water circulation pipeline connected to the equipment to be heated in the supercritical extraction device, wherein a steam heating unit is arranged on the upstream side of the third hot water circulation pipeline.
[0005] The chilled water circulation pipeline is provided with a first electric valve, a chilled water circulation pump, and a chilled water buffer tank. The chilled water circulation pipeline is also provided with a chilled water replenishment constant pressure pipeline.
[0006] The cooling water circulation pipeline is provided with a second electric valve, a cooling water circulation pump, and a cooling water storage tank. The cooling water circulation pipeline is also provided with a cooling water replenishment constant pressure pipeline.
[0007] The first hot water circulation pipeline is provided with a third electric valve, a first hot water circulation pump, and a hot water replenishment constant pressure pipeline.
[0008] The second hot water circulation pipeline is provided with a fourth electric valve and a second hot water circulation pump.
[0009] The third hot water circulation pipeline is provided with a fifth electric valve and a third hot water circulation pump.
[0010] The steam heat supplement unit comprises a heat supplement pipeline arranged on the upstream side of the third hot water circulation pipeline, a steam-hot water heat exchanger is arranged on the heat supplement pipeline, and a steam pipeline is connected to the steam-hot water heat exchanger.
[0011] The CO 2 The equipment to be cooled in the supercritical extraction device includes a primary CO 2 Condenser, CO 2 Liquid storage tank, secondary CO 2 Condenser, CO 2 Booster pump, the CO 2 The equipment to be heated in the supercritical extraction device includes CO 2 Extraction heater, extraction kettle, primary CO 2 Separation heater, primary CO 2 Separation kettle, secondary CO 2 Separation heater and secondary CO 2 Separation kettle.
[0012] The extraction kettle and the primary CO 2 A first-stage throttle valve is provided between the separation heaters.2 Separator and secondary CO 2 A secondary throttle valve is provided between the separation heaters.
[0013] The CO 2 The supercritical extraction device also includes a device for supplementing CO 2 Low temperature CO 2 Storage tanks and CO 2 Transfer pump.
[0014] The utility model provides an application in CO 2 The energy-saving process cold and hot water system of supercritical extraction has changed the current situation that the traditional refrigeration unit produces chilled water on the evaporation side while emitting a large amount of heat energy to the atmosphere on the condensation side. By setting up a heat pump unit to fully recover the low-grade heat energy of the refrigeration unit and adding a solar collector, the steam consumption in the production process is greatly reduced to meet the CO 2 The supercritical extraction process requires both chilled water and hot water to achieve CO 2 The supercritical extraction process saves energy and reduces consumption, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] picture 1 This is a schematic diagram of the structure of the utility model Figure 1 .
[0016] picture 2 This is a schematic diagram of the structure of the utility model Figure 2 . DETAILED DESCRIPTION
[0017] The following is a detailed description of an embodiment of the utility model in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific working process are given, but the protection scope of the utility model is not limited to the following embodiment.
[0018] like Figure 1 , 2 As shown, the utility model is applied to CO 2 Energy-saving process cold and hot water systems for supercritical extraction, including CO 2 Supercritical extraction equipment, refrigeration units, heat pump units, etc.
[0019] Among them, CO 2 The equipment to be cooled in the supercritical extraction device includes a primary CO 2 Condenser 11, CO 2 Liquid storage tank 12, secondary CO 2 Condenser 13, CO 2 Booster pump 14, CO 2 The equipment to be heated in the supercritical extraction device includes CO 2Extraction heater 15, extraction kettle 16, primary CO 2 Separation heater 17, primary CO 2 Separation kettle 18, secondary CO 2 Separation heater 19 and secondary CO 2 Separation kettle 110. The extraction kettle 16 and the primary CO 2 A primary throttle valve 111 is provided between the separation heater 17, and a primary CO 2 Separation kettle 18 and secondary CO 2 A secondary throttle valve 112 is provided between the separation heater 19. 2 The supercritical extraction device also includes a device for supplementing CO 2 Low temperature CO 2 Tank 113 and CO 2 Delivery pump 114.
[0020] CO at low pressure and high temperature 2 After primary CO 2 After isobaric cooling in the condenser 11, it becomes liquid CO 2 Enter CO 2 The liquid storage tank 12 stores CO 2 Through secondary CO 2 After the condenser 13 cools down again, the low temperature liquid CO 2 CO 2 The booster pump 14 sucks in the air and pressurizes it, and after reaching supercritical pressure, it enters the CO 2 The CO is preheated in the extraction heater 15 and then enters the extraction kettle 16 along the pipeline for extraction. 2 It is in a supercritical state and has a strong dissolving capacity. After the extraction process is completed, CO2 containing the effective ingredients of the material is dissolved. 2 After the pressure is reduced by the first-stage throttle valve 111, it enters the first-stage CO 2 Separation heater 17; in the first stage CO 2 In the separation heater 17, CO 2 Continue to be heated and then enter the first stage CO 2 Separation kettle 18; in the first stage CO 2 In the separation kettle 18, CO 2 It is heated by the hot water in its jacket. Due to the pressure reduction and other factors, the effective components of the material are heated by the hot water in the jacket. 2 The dissolution rate in the material is reduced, and part of it is separated in the first separation kettle and precipitated at the bottom of the first separation kettle; CO2 containing effective components of the material is dissolved 2 Then the secondary throttle valve 112 is used to reduce the pressure and enter the secondary CO 2 Separate heater 19, after secondary heating, enters secondary CO 2The separation kettle 110 performs precipitation separation. After the secondary separation, the effective components of the material are basically separated, and the pure CO 2 Entering Level 1 CO 2 Condenser 11. In the condenser, CO 2 It is cooled to a liquid state and flows into the CO 2 Liquid storage tank 12, and then enter the next extraction process, and so on. 2 The function of the storage tank 113 is to store low-temperature liquid CO 2 , used to supplement CO to the extraction system 2 With the reciprocating cycle of the extraction system, CO 2 There will be a small amount of leakage or loss. When the pipeline pressure decreases, the low temperature CO 2 Tank 113 passes CO 2 The delivery pump 114 replenishes CO into the system 2 , so that the pressure in the pipeline remains constant.
[0021] The evaporation side of the refrigeration unit 2 is provided with a 2 The chilled water circulation pipeline 31 connected to the equipment to be cooled in the supercritical extraction device is provided with a cooling water circulation pipeline 41 on the condensation side. Among them, the chilled water circulation pipeline 31 is provided with a first electric valve 32, a chilled water circulation pump 33, and a chilled water buffer tank 34, and a chilled water replenishment constant pressure pipeline 36 connected to the chilled water constant pressure device 35 is also provided. The cooling water circulation pipeline 41 includes a first branch pipe 411 connected to a closed cooling tower 47 and a second branch pipe 412 connected to the evaporation side of the heat pump unit 5, on which a second electric valve 42, a cooling water circulation pump 43, and a cooling water storage tank 44 are provided, and a cooling water replenishment constant pressure pipeline 46 connected to the cooling water constant pressure device 45 is also provided on the cooling water circulation pipeline 41.
[0022] The 7°C chilled water produced by the refrigeration unit 2 is transported through the chilled water circulation pipeline 31, pressurized by the chilled water circulation pump 33, stored in the chilled water buffer tank 34, and then enters the primary CO 2 Condenser 11, CO 2 Liquid storage tank 12, secondary CO 2 Condenser 13, CO 2 Booster pump 14 for CO 2 and CO 2 The booster pump cools the chilled water, which is heated and then returns to the evaporation side of the refrigeration unit 2. 2 Condenser 11, CO 2 Liquid storage tank 12, secondary CO 2 Condenser 13, CO 2The process chilled water of each device such as the booster pump 14 is adjusted through the first electric valve 32 on each chilled water branch pipe, so that the chilled water flow of each branch meets the process cooling requirements. The chilled water circulation system is pressurized by the chilled water constant pressure device 35 and the chilled water replenishment constant pressure pipeline 36, and the constant pressure point is at the inlet of the chilled water circulation pump 33.
[0023] The cooling water on the condensing side of the refrigeration unit 2 adopts a closed circulation system. The high-temperature cooling water at its outlet is about 37°C. It is pressurized by the cooling water circulation pump 43 and enters the cooling water storage tank 44 for storage. It is divided into two paths at the outlet of the cooling water storage tank 44, namely the first branch pipe 411 and the second branch pipe 412. The high-temperature cooling water in the first branch pipe 411 enters the closed cooling tower 47 to cool down to about 32°C. The high-temperature cooling water in the second branch pipe 412 enters the evaporation side of the heat pump unit 5, is absorbed by the evaporator of the heat pump unit 5, and is also reduced to about 32°C, and then returns to the condensing side of the refrigeration unit 2. This reciprocating cycle. The first branch pipe 411 and the second branch pipe 412 can be opened one by one, or opened at the same time, which is achieved by adjusting the switch state of the relevant second electric valve 42. The closed cooling water system is constant-pressured by the cooling water replenishment constant-pressure pipeline 46 connected to the cooling water constant-pressure device 45, and the constant-pressure point is at the inlet of the cooling water circulation pump 43.
[0024] The condensing side of the heat pump unit 5 is provided with a first hot water circulation pipeline 71 connected to the hot water storage tank 6, and the hot water storage tank 6 is also provided with a second hot water circulation pipeline 81 connected to the solar collector 8, and a second hot water circulation pipeline 82 connected to the CO 2 The third hot water circulation pipeline 91 connected to the equipment to be heated in the supercritical extraction device, in addition, a steam heat supplement unit is also arranged on the upstream side of the third hot water circulation pipeline 91. Among them, the first hot water circulation pipeline 71 is provided with a third electric valve 72, a first hot water circulation pump 73, and a hot water replenishment constant pressure pipeline 75 connected to the hot water constant pressure device 74. The second hot water circulation pipeline 81 is provided with a fourth electric valve 82 and a second hot water circulation pump 83. The third hot water circulation pipeline 91 is provided with a fifth electric valve 92 and a third hot water circulation pump 93. The steam heat supplement unit includes a heat supplement pipeline 94 arranged on the upstream side of the third hot water circulation pipeline 91, a steam-hot water heat exchanger 95 is arranged on the heat supplement pipeline 94, and a steam pipeline 96 is connected to the steam-hot water heat exchanger 95.
[0025] The hot water in the hot water storage tank 6 comes from the first hot water circulation pipeline 71 connected to the condensing side of the heat pump unit 5 and the second hot water circulation pipeline 81 connected to the solar collector 8, wherein the first hot water circulation pipeline 71 is pressurized by the hot water constant pressure device 74 and the hot water replenishment constant pressure pipeline 75, and the constant pressure point is at the inlet of the first hot water circulation pump 73. The hot water storage tank 6 stores the recoverable heat energy for a short time by storing hot water, which is used to solve the problem of using cold and heat at different times in process production.2 When the supercritical extraction device performs extraction and separation, the hot water in the hot water storage tank 6 enters the third hot water circulation pump 93 through each branch of the third hot water circulation pipeline 91 and is pressurized, and then distributed to the CO 2 Extraction heater 15, extraction kettle 16, primary CO 2 Separation heater 17, primary CO 2 Separation kettle 18, secondary CO 2 Separation heater 19, secondary CO 2 After heat exchange in the separation kettle 110, the hot water temperature is reduced and then returned to the hot water storage tank 6. 2 Extraction heater 15, extraction kettle 16, primary CO 2 Separation heater 17, primary CO 2 Separation kettle 18, secondary CO 2 Separation heater 19, secondary CO 2 The process hot water of each device such as the separation kettle 110 is adjusted through the fifth electric valve 92 on each branch so that the hot water flow rate of each branch meets the process heating requirements. If the hot water temperature does not meet the standard, the steam volume of the steam pipeline 96 is adjusted, and after heat exchange through the steam-hot water heat exchanger 95, the high-temperature hot water is supplemented to the third hot water circulation pipeline 91 through the heat supplement pipeline 94.
[0026] The utility model has the following five operating modes:
[0027] Mode 1: Start the refrigeration unit 2 to produce 7℃ chilled water for the process. At the same time, start the heat pump unit 5 to produce hot water for the process, and start the cooling tower 47 to assist in heat dissipation. It is mainly used in summer when the demand for process chilled water is large and the demand for process hot water is small. Among them, the chilled water circulation system, cooling water circulation system, heating circulation system, and heat circulation system operate according to the corresponding operation mode.
[0028] Mode 2: Turn on the refrigeration unit 2 to produce 7℃ process chilled water, turn on the cooling tower 47 to assist heat dissipation, turn off the heat pump unit 5, and use the solar collector 8 circulation system to produce hot water. It is mainly used in summer when the weather is good during the day and there is sufficient solar energy. Among them, the chilled water circulation system, cooling water circulation system, heating circulation system, and heat circulation system operate according to the corresponding operation mode.
[0029] Mode 3: Start refrigeration unit 2 to produce 7℃ chilled water for process, and at the same time, start heat pump unit 5 to produce hot water for process. It is mainly used when the demand for process chilled water and the demand for process hot water heating are relatively balanced in transition seasons. Among them, the chilled water circulation system, cooling water circulation system, heating circulation system, and heat circulation system operate according to the corresponding operation mode.
[0030] Mode 4: Turn on refrigeration unit 2 to produce 7℃ chilled water for process. At the same time, turn on heat pump unit 5 to produce hot water for process, and turn on steam heating unit for heating. It is mainly used in winter when the demand for process cold water is small, the demand for process hot water heating is large, and the heating capacity of heat pump unit is insufficient. Among them, the chilled water circulation system, cooling water circulation system, heating circulation system, and heat circulation system operate according to the corresponding operation mode.
[0031] Mode 5: Turn on the refrigeration unit 2 to produce 7℃ chilled water for the process. At the same time, turn on the cooling tower 47 to dissipate heat, use the solar collector 8 circulation system to produce hot water, and turn on the steam heating unit for heating. It is mainly used in winter when the demand for process cold water is small, the demand for process hot water heating is large, and the outdoor solar lighting conditions are good. Among them, the chilled water circulation system, cooling water circulation system, heating circulation system, and heat circulation system operate according to the corresponding operation mode.
[0032] The utility model can provide cold water and hot water at the same time by recycling low-grade thermal energy, using solar energy for heat storage, using steam for heat supplement (under extreme conditions of insufficient thermal energy), etc. The above-mentioned various energy forms complement each other and meet the production heat requirements under various production conditions and climatic conditions. The utility model also uses a hot water storage tank to store heat, solving the problem of asynchrony between heat production and heat use. In actual operation, according to outdoor meteorological conditions, process cold and hot load conditions, based on the principles of energy saving and economic operation, the automatic control system selects and switches the above five operating modes through automatic calculation by a computer.
[0033] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
Claims
1. An energy-saving process cold and hot water system for CO2 supercritical extraction, comprising a CO2 supercritical extraction device, characterized in that: It also includes a refrigeration unit, wherein the evaporation side of the refrigeration unit is provided with a chilled water circulation pipeline connected to the equipment to be cooled in the CO2 supercritical extraction device, and the condensation side of the refrigeration unit is provided with a cooling water circulation pipeline, and the cooling water circulation pipeline includes a first branch pipe connected to the cooling tower and a second branch pipe connected to the evaporation side of the heat pump unit; the condensation side of the heat pump unit is provided with a first hot water circulation pipeline connected to the hot water storage tank, and the hot water storage tank is also provided with a second hot water circulation pipeline connected to the solar collector, and a third hot water circulation pipeline connected to the equipment to be heated in the CO2 supercritical extraction device, and a steam heat supplement unit is provided on the upstream side of the third hot water circulation pipeline.
2. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 1 is characterized in that: The chilled water circulation pipeline is provided with a first electric valve, a chilled water circulation pump, and a chilled water buffer tank. The chilled water circulation pipeline is also provided with a chilled water replenishment constant pressure pipeline.
3. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 1 is characterized in that: The cooling water circulation pipeline is provided with a second electric valve, a cooling water circulation pump, and a cooling water storage tank. The cooling water circulation pipeline is also provided with a cooling water replenishment constant pressure pipeline.
4. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 1 is characterized in that: The first hot water circulation pipeline is provided with a third electric valve, a first hot water circulation pump, and a hot water replenishment constant pressure pipeline.
5. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 1 is characterized in that: The second hot water circulation pipeline is provided with a fourth electric valve and a second hot water circulation pump.
6. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 1 is characterized in that: The third hot water circulation pipeline is provided with a fifth electric valve and a third hot water circulation pump.
7. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 1 is characterized in that: The steam heat supplement unit comprises a heat supplement pipeline arranged on the upstream side of the third hot water circulation pipeline, a steam-hot water heat exchanger is arranged on the heat supplement pipeline, and a steam pipeline is connected to the steam-hot water heat exchanger.
8. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 1 is characterized in that: The equipment to be cooled in the CO2 supercritical extraction device includes a primary CO2 condenser, a CO2 liquid storage tank, a secondary CO2 condenser, and a CO2 pressure pump. The equipment to be heated in the CO2 supercritical extraction device includes a CO2 extraction heater, an extraction kettle, a primary CO2 separation heater, a primary CO2 separation kettle, a secondary CO2 separation heater, and a secondary CO2 separation kettle.
9. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 8 is characterized in that: A primary throttle valve is arranged between the extraction kettle and the primary CO2 separation heater, and a secondary throttle valve is arranged between the primary CO2 separation kettle and the secondary CO2 separation heater.
10. The energy-saving process cold and hot water system for CO2 supercritical extraction according to claim 8, characterized in that: The CO2 supercritical extraction device also includes a low-temperature CO2 storage tank and a CO2 delivery pump for replenishing CO2.