Closed-loop oil-driven low-temperature deodorization vacuum system
By employing a closed-loop system consisting of a liquid ring pump and a refrigeration unit in the vegetable oil deodorization vacuum system, and using oil as the working fluid, the problems of system instability and equipment damage have been solved, achieving a more efficient and economical vacuum deodorization process and extending equipment life.
Patent Information
- Application Number
- CN202520431753.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-13
AI Technical Summary
Existing vegetable oil deodorization vacuum systems suffer from high operating costs, poor stability, and short equipment lifespan. In particular, water ring pumps are prone to damage at high temperatures, and Roots pumps are prone to overheating under excessive pressure differentials, leading to system instability and high maintenance costs.
A liquid ring pump is used as the circulating medium, combined with a refrigeration unit and a Roots pump to form a closed-loop system. Oil is used as the working fluid, and the distillate is separated by gravity sedimentation, which reduces noise and vibration, provides a higher and more stable vacuum, and reduces system energy consumption and extends equipment life through the refrigeration unit.
The system has achieved stable operation, reduced maintenance frequency and operating costs, extended equipment life, and has the function of organic waste gas recovery, which improves the system's economy and continuous operation capability.
Smart Images
Figure CN223950970U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of vegetable oil processing, in particular to a closed loop type oil drive low temperature deodorization vacuum system. BACKGROUND
[0002] In the vegetable oil refining process, deodorization is the key link for removing free fatty acids, peroxides, odor substances and potential carcinogens (such as trans fatty acids, trichloropropanol, etc.) in oil. The deodorization process needs to be carried out under high temperature (200-260℃) and high vacuum (ideal vacuum degree ≤20Pa) conditions to reduce the boiling point of light components, inhibit side reactions caused by high temperature, and at the same time improve the smoke point, safety and shelf life of oil.
[0003] At present, most of the vegetable oil industry adopts multi-stage series high or low level steam jet vacuum unit, which has the advantages of high vacuum degree, stable working condition, and can provide less than 80pa vacuum condition under normal circumstances, but the disadvantage is that steam is used as the driving medium, the cost of manufacturing steam is very high, and a large amount of cooling water is needed for heat exchange. Under the current situation of the oil market sales downturn, the multi-stage series vacuum system driven by steam exists a great waste of resources, and is gradually being transformed or eliminated.
[0004] In addition, the vacuum system is formed by using a water ring pump as a rough vacuum pump and a Roots pump as a multi-stage pump in series. When the rough vacuum degree of the water ring pump is established, the absolute vacuum degree and the displacement depend on the exhaust capacity and the number of stages of the Roots pump. This system uses water as the working fluid and is divided into an open loop system for one-time discharge of working fluid and a closed loop system for recycling. The stability of the system vacuum depends on the stability of the rough vacuum degree provided by the water ring pump. The advantages of using water as the working fluid are low operating cost and easy-to-accept system cost. The disadvantage is that the water ring pump can only operate at a water temperature not higher than 35℃ when using water as the working fluid. Water is prone to cavitation under vacuum conditions, which causes irreversible mechanical damage to the impeller. The impeller may vibrate at high frequency or produce loud noise when it is out of balance at high speed. As the service time increases, the rough vacuum degree provided by the water ring pump gradually decreases to below the pressure limit allowed by the Roots pump. At this time, the Roots pump is working under superpressure difference and overheating, which is prone to irreversible mechanical damage such as overheating of the rotating drum, explosion of the rotating drum, and breakdown of the shell. The average service life of the water ring pump using water as the working fluid is not more than 2 years.
[0005] In summary, the existing vegetable oil deodorization vacuum system faces the problems of high operating cost, poor stability and short equipment life, which restricts the process optimization and economic benefits. UTILITY MODEL CONTENTS
[0006] In view of the above deficiencies of the prior art, the utility model provides a closed loop formula oil drive's low temperature deodorization vacuum system, liquid ring pump uses oil as circulating medium, can provide higher and more stable front stage vacuum interval, and further promotes the stability of system continuous operation, the working temperature of liquid ring pump is allowed to use within 65 degrees Celsius, does not need a large amount of cooling water heat exchange, promotes the economy of system operation, separates and discharges distillate etc.
[0007] In order to realize above -mentioned purpose, the utility model discloses a closed loop formula oil drive's low temperature deodorization vacuum system, including liquid ring pump, closed loop tank, plate heat exchanger, refrigerator, condensing trap and roots pump group, the closed loop tank stores circulating oil and low -level export with the heat source import of plate heat exchanger is connected, the heat source export of plate heat exchanger is connected with the liquid inlet of liquid ring pump, the liquid outlet of liquid ring pump is connected with the high -level import of closed loop tank, the export of refrigerator is connected with the cold source import of plate heat exchanger, the cooling import of condensing trap respectively, the import of refrigerator is connected with the cold source export of plate heat exchanger, the cooling export of condensing trap respectively, roots pump group and liquid ring pump are connected in series and form the vacuum system, the import of roots pump group is connected with the top exhaust port of condensing trap, the import of condensing trap is connected with the export of deodorization tank.
[0008] Preferably, the outlet of the refrigerator is connected to the cooling inlet of the roots pump set, and the inlet is connected to the cooling outlet of the roots pump set.
[0009] Preferably, the roots pump set is composed of two roots pumps connected in series.
[0010] Preferably, the bottom of the condensing trap is provided with a condensing trap blowdown pipe.
[0011] Preferably, a filter is provided on the pipeline connecting the low-level outlet of the closed loop tank with the heat source inlet of the plate heat exchanger.
[0012] Preferably, the top of the closed loop tank is provided with an access manhole, an oil filler port, and a closed loop tank exhaust port, and the bottom is provided with a closed loop tank blowdown pipe. A liquid level gauge is provided on the tank body of the closed loop tank.
[0013] Preferably, corrugated pipes for vibration damping are provided on the pipelines connected to the liquid inlet and liquid outlet of the liquid ring pump.
[0014] The utility model provides a closed loop formula oil drive's low temperature deodorization vacuum system, has the following beneficial effect:
[0015] 1.The oil used in the liquid ring pump serves as a circulating medium, does not produce high-frequency resonance and harsh noise, can provide a higher and more stable pre-stage vacuum interval, and thus improves the stability of continuous operation of the system; the working temperature of the liquid ring pump is allowed to be used within 65 degrees Celsius, without the need for a large amount of cooling water for heat exchange, thereby improving the economy of system operation; the distillate and the like are separated and discharged by the way of specific gravity sedimentation, the maintenance frequency is reduced, and the service life of the liquid ring pump can be prolonged by 8-10 years or more.
[0016] 2.The outlet of the refrigerator is connected with the cooling inlet of the Roots pump set, the inlet is connected with the cooling outlet of the Roots pump set, and the Roots pump set is cooled by the refrigerator; a filter is arranged on the pipeline connecting the low-position outlet of the closed loop tank and the heat source inlet of the plate heat exchanger, and the filter filters the circulating oil entering the liquid ring pump from the closed loop tank.
[0017] 3.The utility model has the function of organic waste gas recovery, because the working liquid is recycled under low temperature, the system can suck the organic waste gas generated in the deodorization into the impeller chamber, mix at high speed, dissolve the organic waste gas under the wet capture of the low-temperature oil, and form condensate in the closed loop tank, which can be recovered and discharged after heating and separation, and the organic waste gas recovery process is completed. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 The utility model discloses a low-temperature deodorization vacuum system driven by a closed loop type oil.
[0019] In the drawing: 1, liquid ring pump; 2, closed loop tank; 2-1, manhole; 2-2, oil filler; 2-3, closed loop tank exhaust port; 2-4, liquid level meter; 2-5, closed loop tank blowdown pipe; 3, plate heat exchanger; 4, refrigerator; 5, condensing trap; 5-1, condensing trap blowdown pipe; 6, Roots pump set; 7, filter; 8, corrugated pipe. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0021] For example, Figure 1As shown, a closed loop oil driven low temperature deodorization vacuum system comprises a liquid ring pump 1, a closed loop tank 2, a plate heat exchanger 3, a refrigerator 4, a condensing trap 5 and a Roots pump set 6, the closed loop tank 2 stores circulating oil and the low outlet is connected with the heat source inlet of the plate heat exchanger 3, the heat source outlet of the plate heat exchanger 3 is connected with the liquid inlet of the liquid ring pump 1, the liquid outlet of the liquid ring pump 1 is connected with the high inlet of the closed loop tank 2, the outlet of the refrigerator 4 is connected with the cold source inlet of the plate heat exchanger 3 and the cooling inlet of the condensing trap 5 respectively, the inlet of the refrigerator 4 is connected with the cold source outlet of the plate heat exchanger 3 and the cooling outlet of the condensing trap 5 respectively, the Roots pump set 6 and the liquid ring pump 1 are connected in series to form a vacuum system, the inlet of the Roots pump set 6 is connected with the top exhaust port of the condensing trap 5, and the inlet of the condensing trap 5 is connected with the outlet of the deodorization tank; the outlet of the refrigerator 4 is connected with the cooling inlet of the Roots pump set 6, and the inlet is connected with the cooling outlet of the Roots pump set 6; the Roots pump set 6 is composed of two Roots pumps connected in series; the bottom of the condensing trap 5 is provided with a condensing trap blowdown pipe 5-1; a filter 7 is arranged on the pipeline connecting the low outlet of the closed loop tank 2 with the heat source inlet of the plate heat exchanger 3; the top of the closed loop tank 2 is provided with a manhole 2-1, an oil filling port 2-2 and a closed loop tank exhaust port 2-3, and the bottom is provided with a closed loop tank blowdown pipe 2-5, and the tank body of the closed loop tank 2 is provided with a liquid level meter 2-4; corrugated pipes 8 for vibration reduction are arranged on the pipelines connected with the liquid inlets and outlets of the liquid ring pump 1.
[0022] The detailed connection means is a known technology in the art, and the working principle and process are mainly introduced as follows:
[0023] In the utility model, the liquid ring pump 1, the refrigerator 4 and the Roots pump are connected with the external electric control system through wires, and the above equipment and the connection mode are prior art, and will not be described in detail.
[0024] According to the description attached Figure 1It can be known that, when the utility model is used, the liquid ring pump 1 is used as a front stage pump, a plurality of Roots pumps are connected in series to form a Roots pump group 6 to form a closed loop vacuum system, the refrigerator 4 is started, the refrigerator 4 provides 5 degrees Celsius low temperature water for the condensing trap 5 and the plate heat exchanger 3 to exchange heat, the liquid ring pump 1 is started, the liquid ring pump 1 makes the working cycle oil flow out from the low position outlet of the closed loop tank 2, flows into the liquid ring pump 1 after being cooled by the plate heat exchanger 3, the oil fills the impeller chamber and rotates with the impeller at high speed, under the action of centrifugal force, a rotating liquid seal ring is formed, when the vacuum degree of the liquid ring pump 1 gradually increases to-0.1mpa, the PLC circuit receives the differential pressure transmitter signal, starts the Roots pump group 6 according to the set program, the vacuum system enters the working state, along with the operation of the vacuum system, the organic waste gas generated in the deodorization process passes through the condensing trap 5, most (about 80%) of the waste gas is condensed and trapped to form condensate and is collected at the bottom of the condensing trap 5, a small part (about 20%) of the organic waste gas flows into the liquid ring pump 1 through the Roots pump group 6, the hot waste gas entering the vacuum system is cooled from 160 degrees to 25 degrees through the condensing trap 5, thereby ensuring the stability of the vacuum system, after being mixed by the high speed rotation of the impeller, the working oil is wet trapped into the closed loop tank 2, thereby recycling the organic waste gas, after the waste gas recycling is completed, the operation of the vacuum system is stopped, the oil in the closed loop tank 2 is heated to 80 degrees by the reverse refrigeration of the refrigerator 4 and is settled for 4 hours, the organic waste gas condensate, moisture and a small amount of deodorization distillate in the closed loop tank 2 are discharged, and the working oil can be recycled after being discharged and purified; the utility model uses oil as the circulating medium of the liquid ring pump 1, since the oil does not have cavitation, the liquid ring pump 1 will not produce high frequency resonance and harsh noise, the working temperature of the liquid ring pump 1 is allowed to be used within 65 degrees Celsius, a higher and more stable front stage vacuum range can be provided, thereby improving the stability of the continuous operation of the system; the circulating refrigeration water of the double effect heat exchanger 4 group and the plate heat exchanger 3 is used to cool the circulating oil, since the amount of oil participating in the circulation is limited, the refrigeration cycle of the refrigerator 4 is used, thereby reducing the operation cost of the deodorization link; the mutual solubility of the working oil and the deodorization waste gas is very strong, under the low temperature condition provided by the refrigerator 4, the working oil has a certain recycling and trapping effect on the organic harmful gas, the working oil can be heated to 80 degrees through the reverse refrigeration of the double effect refrigeration system, the moisture and a small amount of distillate in the working oil can be separated and discharged through the way of specific gravity settlement under the temperature condition, the service life of the working liquid is greatly prolonged, the consumption is reduced, and the service life of the liquid ring pump 1 can be prolonged by more than 8-10 years under the condition.
[0025] There is a possibility of implementation that the outlet of the refrigerator 4 is connected with the cooling inlet of the Roots pump group 6, the inlet is connected with the cooling outlet of the Roots pump group 6, and the Roots pump group 6 is cooled by the refrigerator 4.
[0026] There is a possibility of implementation, Roots pump group 6 is composed of two Roots pumps in series, the model of two Roots pumps is ZJ1200 and ZJ300 respectively, reduces the operation cost of vacuum system.
[0027] There is a possibility of implementation, the bottom of the condensing trap 5 is provided with a condensing trap 5 blowdown pipe, and the condensed liquid at the bottom of the condensing trap 5 is discharged through the condensing trap 5 blowdown pipe.
[0028] There is a possibility of implementation, the pipeline connecting the low-position outlet of the closed loop tank 2 and the heat source inlet of the plate heat exchanger 3 is provided with a filter 7, and the filter 7 filters the circulating oil entering the liquid ring pump 1 from the closed loop tank 2.
[0029] There is a possibility of implementation, the top of the closed loop tank 2 is provided with an inspection manhole 2-1, an oil filling port 2-2 and a closed loop tank 2 exhaust port, the bottom is provided with a closed loop tank 2 blowdown pipe, the tank body of the closed loop tank 2 is provided with a liquid level meter 2-4, and the closed loop tank 2 blowdown pipe is used to discharge organic waste gas condensate, water and a small amount of deodorized distillate in the closed loop tank 2.
[0030] There is a possibility of implementation, the pipeline connecting the liquid inlet and outlet of the liquid ring pump 1 is provided with a corrugated pipe 8 for vibration reduction, and the corrugated pipe 8 reduces the vibration of the pipeline connecting the liquid inlet and outlet of the liquid ring pump 1.
[0031] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and its equivalents.
Claims
1. A closed loop oil driven low temperature deodorization vacuum system comprising a liquid ring pump (1), a closed loop tank (2), a plate heat exchanger (3), a chiller (4), a condenser trap (5) and a roots pump set (6), characterized in that, The closed loop tank (2) stores circulating oil and is connected to the heat source inlet of the plate heat exchanger (3) through the low position outlet, the heat source outlet of the plate heat exchanger (3) is connected to the liquid inlet of the liquid ring pump (1), the liquid outlet of the liquid ring pump (1) is connected to the high position inlet of the closed loop tank (2), the outlet of the refrigerator (4) is respectively connected to the cold source inlet of the plate heat exchanger (3) and the cooling inlet of the condensation trap (5), the inlet of the refrigerator (4) is respectively connected to the cold source outlet of the plate heat exchanger (3) and the cooling outlet of the condensation trap (5), the Roots pump group (6) and the liquid ring pump (1) are connected in series to form a vacuum pumping system, the inlet of the Roots pump group (6) is connected to the top exhaust port of the condensation trap (5), and the inlet of the condensation trap (5) is connected to the outlet of the deodorization tank.
2. A closed loop oil driven low temperature deodorization vacuum system according to claim 1, characterized in that, The outlet of the refrigerator (4) is connected to the cooling inlet of the Roots pump group (6), and the inlet is connected to the cooling outlet of the Roots pump group (6).
3. A closed loop oil driven low temperature deodorization vacuum system according to claim 1 or 2, characterized in that, The Roots pump group (6) is composed of two Roots pumps connected in series.
4. A closed loop oil driven low temperature deodorization vacuum system according to claim 1, characterized in that, The bottom of the condensation trap (5) is provided with a condensation trap blowdown pipe (5-1).
5. A closed loop oil driven low temperature deodorization vacuum system according to claim 1, wherein, A filter (7) is arranged on the pipeline connecting the low position outlet of the closed loop tank (2) to the heat source inlet of the plate heat exchanger (3).
6. A closed loop oil driven low temperature deodorization vacuum system according to claim 1, characterized in that, The top of the closed loop tank (2) is provided with an inspection manhole (2-1), an oil filling port (2-2) and a closed loop tank exhaust port (2-3), and the bottom is provided with a closed loop tank blowdown pipe (2-5), and the tank body of the closed loop tank (2) is provided with a liquid level meter (2-4).
7. A closed loop oil driven low temperature deodorization vacuum system according to claim 1, wherein, Corrugated pipes (8) for vibration reduction are arranged on the pipelines connected to the liquid inlet and liquid outlet of the liquid ring pump (1).