Distillation negative pressure pumping device
By designing a distillation and pumping negative pressure device combining condenser, heat exchanger, Roots vacuum pump, liquid ring vacuum pump and air-liquid separator, the problem of inefficiency in existing vacuum pumps during long-term operation is solved, and the effect of providing negative pressure efficiently for a long time is achieved.
Patent Information
- Application Number
- CN202421470212.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-06-25
AI Technical Summary
The existing liquid ring vacuum pumps and Roots vacuum pumps have problems such as rising temperature, decreasing vacuum degree, and small air extraction during long-term operation, resulting in the inability to provide negative pressure efficiently.
Design a distillation and pumping negative pressure device, combining condenser, heat exchanger, Roots vacuum pump, liquid ring vacuum pump and gas-liquid separator, to separate non-condensed gas from the exhaust gas of the distillation system through the condenser, and use the heat exchanger to maintain the temperature of the working liquid of the liquid ring vacuum pump to ensure long-term stable operation.
It achieves long-term negative pressure, reduces operating costs, meets the actual needs of the enterprise, and meets the demand for high vacuum through series Roots vacuum pump and liquid ring vacuum pump.
Smart Images
Figure CN222871361U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical industry, in particular to a distillation negative pressure extraction device. Background Art
[0002] Liquid ring vacuum pump is a device that uses liquid (water, oil, etc.) as the working medium and performs gas extraction by isothermal compression. Conventional liquid ring vacuum pumps have many defects such as temperature rise, vacuum decrease, relatively small air extraction volume, and long-term inability to operate efficiently after long-term operation.
[0003] Roots vacuum pumps are widely used in metallurgy, chemical industry, food, medicine and other industries. Due to their structural characteristics, they cannot be started at atmospheric pressure, their exhaust cannot be discharged directly into the atmosphere, and their exhaust volume is small. Their use occasions are limited, resulting in a narrow scope of application.
[0004] Therefore, how to use the liquid ring vacuum pump and the Roots vacuum pump to work together to achieve the purpose of providing negative pressure for a long time and efficiently is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention
[0005] The purpose of the utility model is to provide a distillation negative pressure extraction device in view of the deficiencies in the prior art, which has a simple structure, low operating cost, can provide negative pressure for a long time, and meet the actual needs of enterprises.
[0006] The technical scheme of the utility model is: a distillation negative pressure extraction device, comprising a condenser, a heat exchanger, a Roots vacuum pump, a liquid ring vacuum pump, and a gas-liquid separator, wherein the process medium inlet of the condenser is used to be connected to the exhaust port of the distillation system, the gas phase outlet of the condenser is connected to the inlet of the liquid ring vacuum pump through a first pipeline, a first valve is arranged on the first pipeline, the liquid phase outlet of the condenser discharges condensate to the outside, the outlet of the liquid ring vacuum pump is connected to the gas-liquid separator through the heat exchanger, a reflux pipeline is arranged on the gas-liquid separator to provide working medium to the liquid ring vacuum pump, a working liquid inlet is arranged, and a working liquid exhaust port is arranged, the inlet of the Roots vacuum pump is connected to the first pipeline and is located upstream of the first valve, a second valve is arranged on the inlet of the Roots vacuum pump, and the outlet of the Roots vacuum pump is connected to the first pipeline and is located downstream of the first valve.
[0007] The outlet of the Roots vacuum pump is connected to the first pipeline through a bellows.
[0008] A check valve is arranged on the first pipeline and is located downstream of the connection point between the Roots vacuum pump outlet and the first pipeline.
[0009] A thermometer is arranged on the reflux pipeline.
[0010] The liquid phase outlet of the condenser is connected to the feed port of a collecting tank, the feed port of the collecting tank is provided with a third valve, the bottom of the collecting tank is provided with a drain port, and the top of the collecting tank is provided with an emptying port.
[0011] A vent valve is arranged on the first pipeline, and is located upstream of the connection point between the inlet of the Roots vacuum pump and the first pipeline.
[0012] The above technical solution has the following beneficial effects:
[0013] 1. The distillation negative pressure extraction device includes a condenser, a heat exchanger, a Roots vacuum pump, a liquid ring vacuum pump, and a gas-liquid separator, wherein the condenser is used to separate the non-condensable gas in the gas phase discharged from the distillation system and collect the fractions, and the heat exchanger is used to maintain the temperature of the working fluid of the liquid ring vacuum pump to ensure that the liquid ring vacuum pump works stably for a long time. The process medium inlet of the condenser is used to be connected to the exhaust port of the distillation system, and the gas phase outlet of the condenser is connected to the inlet of the liquid ring vacuum pump through a first pipeline. A first valve is arranged on the first pipeline. By opening the first valve, negative pressure can be provided to the distillation system through the liquid ring vacuum pump and the condenser. The liquid phase outlet of the condenser discharges condensate to the outside to obtain separated fractions. The outlet of the liquid ring vacuum pump is connected to the gas-liquid separator via a heat exchanger. A reflux pipeline is provided on the gas-liquid separator to provide working medium to the liquid ring vacuum pump, a working liquid inlet is provided, and a working liquid exhaust port is provided, so that the working liquid of the liquid ring vacuum pump circulates between the vacuum pump, the heat exchanger, and the gas-liquid separator, and the temperature of the working liquid is maintained. The amount of working liquid in the liquid ring vacuum pump can also be determined by observing the liquid level height in the gas-liquid separator. The gas in the working liquid is separated by the gas-liquid separator to ensure the working efficiency of the liquid ring vacuum pump and maintain its stability. The inlet of the Roots vacuum pump is connected to the first pipeline and is located upstream of the first valve. The inlet of the Roots vacuum pump is provided with a second valve. The outlet of the Roots vacuum pump is connected to the first pipeline and is located downstream of the first valve. When high vacuum is required, the first valve is closed and the second valve is opened, so that the Roots vacuum pump and the liquid ring vacuum pump are connected in series, which can not only meet actual needs, but also maintain the needs of long-term normal operation.
[0014] 2. The outlet of the Roots vacuum pump is connected to the first pipeline through a bellows to reduce the impact of the vibration of the Roots vacuum pump on the liquid ring vacuum pump and ensure that the Roots vacuum pump and the liquid ring vacuum pump work normally for a long time.
[0015] 3. A thermometer is installed on the return pipe to monitor the temperature of the working fluid of the liquid ring vacuum pump to ensure the normal operation of the liquid ring vacuum pump.
[0016] 4. The liquid phase outlet of the condenser is connected to the feed port of a collecting tank, and the feed port of the collecting tank is provided with a third valve. A drain port is provided at the bottom of the collecting tank, and an emptying port is provided at the top, so that the condensed and separated fractions are concentrated and collected in the collecting tank and can be smoothly discharged into and out of the collecting tank.
[0017] 5. A vent valve is provided on the first pipeline, which is located upstream of the connection point between the inlet of the Roots vacuum pump and the first pipeline. When the vacuuming is completed or the liquid ring vacuum pump and the Roots vacuum pump need maintenance, first stop the Roots vacuum pump, close the second valve, open the first valve, stop supplying gas to the condenser, and then open the vent valve to shut down the liquid ring vacuum pump to meet the actual needs of the enterprise.
[0018] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a connection diagram of the utility model.
[0020] In the accompanying drawings, 1 is a condenser, 11 is a process medium inlet, 12 is a gas phase outlet, 13 is a liquid phase outlet, 2 is a heat exchanger, 3 is a Roots vacuum pump, 4 is a liquid ring vacuum pump, 5 is a gas-liquid separator, 51 is a reflux pipeline, 52 is a working fluid inlet, 53 is a working fluid exhaust port, 6 is a first pipeline, 7 is a bellows, 8 is a check valve, 9 is a thermometer, 10 is a collecting tank, a is a first valve, b is a second valve, c is a third valve, and d is a vent valve. DETAILED DESCRIPTION
[0021] See also Figure 1, is a specific embodiment of a distillation negative pressure extraction device. The distillation negative pressure extraction device includes a condenser 1, a heat exchanger 2, a Roots vacuum pump 3, a liquid ring vacuum pump 4, and a gas-liquid separator 5. The process medium inlet 11 of the condenser 1 is used to be connected to the exhaust port of the distillation system. Usually, the process medium inlet is provided with a valve. The gas phase outlet 12 of the condenser 1 is connected to the inlet of the liquid ring vacuum pump 4 through the first pipeline 6. The first pipeline 6 is provided with a vent valve d, a first valve a, and a check valve 8, and the first valve a is located downstream of the vent valve d, and the check valve 8 is located downstream of the first valve a. The liquid phase outlet 13 of the condenser 1 discharges condensate to the outside. Specifically, the liquid phase outlet of the condenser 1 is connected to the feed port of a collection tank 10, and the feed port of the collection tank 10 is provided with a third valve c. The bottom of the collection tank 10 is provided with a drain port, and the top is provided with an emptying port, and the drain port and the emptying port are usually provided with valves. The outlet of the liquid ring vacuum pump 4 is connected to the gas-liquid separator 5 through the heat exchanger 2. Obviously, the outlet of the liquid ring vacuum pump is connected to the gas-liquid separator through the process medium channel of the heat exchanger. The gas-liquid separator 5 is provided with a reflux pipeline 51 to provide working medium to the liquid ring vacuum pump 4, a working liquid inlet 52, and a working liquid exhaust port 53. Usually, a valve is also provided. The working liquid inlet is used to replenish the working liquid in the gas-liquid separator, and the working liquid exhaust port is used to discharge the working liquid (containing a small amount of organic impurities). In order to facilitate the monitoring of the temperature of the working liquid of the liquid ring vacuum pump, a thermometer 9 is provided on the reflux pipeline. The inlet of the Roots vacuum pump 3 is connected to the first pipeline 6, located between the vent valve d and the first valve a. The inlet of the Roots vacuum pump 3 is provided with a second valve b. The outlet of the Roots vacuum pump 3 is connected to the first pipeline 6, located between the first valve a and the check valve 8, and usually, the outlet of the Roots vacuum pump 3 is connected to the first pipeline 6 through a bellows 7.
[0022] The working principle of the utility model is as follows: when the low-boiling-point component is distilled (the boiling point of the substance is lower than 100°C), the condenser and the heat exchanger are both fed with a heat exchange medium of 6-10°C. The first valve is opened, the liquid ring vacuum pump is operated, and the gas phase discharged from the distillation system passes through the condenser, wherein the condensed condensate is sent to the collection tank, and the non-condensable gas passes through the first pipeline, the liquid ring vacuum pump, and the gas-liquid separator, and is discharged from the gas phase outlet of the gas-liquid separator. The working fluid of the liquid ring vacuum pump can be maintained at about 25°C, and the vacuum degree is maintained at about 3000Pa for a long time. When the high-boiling-point component is distilled (the boiling point of the substance is higher than 100°C), the first valve is closed, the second valve is opened, the liquid ring vacuum pump is operated until the vacuum degree is less than 2500Pa, and the Roots vacuum pump is operated, and the vacuum degree is maintained at about 1000Pa for a long time.
Claims
1. A distillation negative pressure extraction device, characterized in that: It comprises a condenser (1), a heat exchanger (2), a Roots vacuum pump (3), a liquid ring vacuum pump (4), and a gas-liquid separator (5). The process medium inlet (11) of the condenser (1) is used to be connected to the exhaust port of the distillation system, the gas phase outlet (12) of the condenser (1) is connected to the inlet of the liquid ring vacuum pump (4) through a first pipeline (6), and a first valve (a) is provided on the first pipeline (6). The liquid phase outlet (13) of the condenser (1) discharges condensate to the outside. The outlet of the liquid ring vacuum pump (4) is connected to the gas-liquid separator (5) via the heat exchanger (2). The gas-liquid separator (5) is provided with a return pipeline (51) to provide working medium to the liquid ring vacuum pump (4), a working liquid inlet (52) and a working liquid exhaust port (53). The inlet of the Roots vacuum pump (3) is connected to the first pipeline (6) and is located upstream of the first valve (a). The inlet of the Roots vacuum pump (3) is provided with a second valve (b). The outlet of the Roots vacuum pump (3) is connected to the first pipeline (6) and is located downstream of the first valve (a).
2. The distillation negative pressure extraction device according to claim 1, characterized in that: The outlet of the Roots vacuum pump (3) is connected to the first pipeline (6) via a bellows (7).
3. The distillation negative pressure extraction device according to claim 1, characterized in that: A check valve (8) is provided on the first pipeline (6) and is located downstream of the connection point between the outlet of the Roots vacuum pump and the first pipeline.
4. The distillation negative pressure extraction device according to claim 1, characterized in that: A thermometer (9) is provided on the reflux pipeline (51).
5. The distillation negative pressure extraction device according to claim 1, characterized in that: The liquid phase outlet of the condenser (1) is connected to the feed port of a collecting tank (10), and the feed port of the collecting tank (10) is provided with a third valve (c). The bottom of the collecting tank (10) is provided with a drain port, and the top is provided with an emptying port.
6. The distillation negative pressure extraction device according to claim 1, characterized in that: The first pipeline (6) is provided with a vent valve (d), which is located upstream of the connection point between the inlet of the Roots vacuum pump and the first pipeline.