Device for assisting accurate metering and conveying of low-boiling-point easily-gasified liquid

Abstract

The utility model discloses a device for assisting accurate metering and conveying of low-boiling-point easily-gasified liquid, and belongs to the technical field of liquid conveying devices. A device for assisting accurate metering and conveying of low-boiling-point easily-gasified liquid comprises a liquid storage tank and further comprises an auxiliary stable conveying device used for pressurizing the liquid storage tank, increasing the boiling point of the conveyed liquid and reducing the temperature of the conveyed liquid; the auxiliary stable conveying device comprises a constant pressure valve, a buffer tank, a jacketed pipe, a nitrogen steel cylinder and a compression refrigerator; the liquid inlet end of the buffer tank is connected with the liquid storage tank; the nitrogen steel cylinder is connected with the gas inlet end of the constant pressure valve; the auxiliary stable conveying device is used for pressurizing the conveyed liquid storage tank, the boiling point of the conveyed liquid is increased, meanwhile, the temperature of the conveyed liquid is lowered, gasification of the liquid entering the metering pump cavity is reduced, the gas binding phenomenon is prevented, and therefore the purpose of continuously and stably conveying the liquid is achieved.

Description

Technical Field

[0001] This utility model relates to the field of liquid conveying device technology, and in particular to a device for accurately metering and conveying low-boiling-point, easily vaporized liquids. Background Technology

[0002] In the production of fine chemicals, it is often necessary to use easily vaporized liquids, such as isobutane, n-butane, and hydrogen sulfide. Metering pumps are required to continuously and stably deliver these liquids to the reactor to participate in the reaction.

[0003] In actual production, the temperature and pressure of the storage tanks for this type of liquid correspond to the temperature of the liquid and the saturated vapor pressure at that temperature.

[0004] When using metering pumps to transport this type of liquid, vapor binding often occurs due to the vaporization of the liquid in the pump chamber, leading to inaccurate metering or even liquid flow interruption.

[0005] Therefore, an apparatus is provided to assist in the accurate metering and delivery of low-boiling-point, easily vaporized liquids, in order to solve the problems mentioned above. Utility Model Content

[0006] The purpose of this invention is to solve the problems mentioned in the background art and to provide a device for accurately metering and transporting low-boiling-point, easily vaporized liquids.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A device for accurately metering and conveying low-boiling-point, easily vaporized liquids includes a liquid storage tank and further includes:

[0009] An auxiliary stabilizing conveying device is used to pressurize a liquid storage tank, increase the boiling point of the conveyed liquid, and decrease the temperature of the conveyed liquid.

[0010] The auxiliary stabilizing conveying device includes: a constant pressure valve, a buffer tank, a jacketed pipe, a nitrogen cylinder, and a compressor / refrigeration unit;

[0011] The inlet of the buffer tank is connected to the liquid storage tank;

[0012] The nitrogen cylinder is connected to the inlet of the constant pressure valve, and the outlet of the constant pressure valve is connected to the buffer tank.

[0013] The compressor refrigeration unit is used to input cold air into the jacket of the jacketed tube;

[0014] The air inlet of the jacketed tube is connected to the air outlet of the buffer tank.

[0015] Preferably, the buffer tank has an inlet pipeline connected to its inlet end and a pressure gauge connected to its outlet end. The inlet pipeline is connected to a liquid storage tank, and the constant pressure valve has an inlet pipeline connected to its inlet end. The inlet pipeline is connected to a nitrogen cylinder.

[0016] Preferably, the jacketed tube is provided with a jacket inlet and a jacket outlet, and the jacket inlet and jacket outlet are respectively connected to the liquid outlet and liquid inlet of the compressor refrigeration unit.

[0017] Preferably, a liquid outlet line is connected to the liquid outlet end of the jacketed tube, and the liquid outlet line is connected to the jacketed tube.

[0018] Preferably, a safety vent valve is connected to the liquid outlet line.

[0019] Preferably, a metering pump is connected to the outlet end of the outlet pipeline.

[0020] Compared with the prior art, this utility model provides a device for accurately metering and conveying low-boiling-point, easily vaporized liquids, which has the following beneficial effects:

[0021] This invention uses an auxiliary stabilizing conveying device to pressurize the liquid storage tank, thereby increasing the boiling point of the liquid and reducing its temperature. This reduces the vaporization of the liquid entering the metering pump chamber and prevents gas binding, thus achieving continuous and stable liquid conveying. Attached Figure Description

[0022] Figure 1 This invention provides a schematic diagram of the structure of a device for accurately metering and conveying low-boiling-point, easily vaporized liquids. Figure 1 ;

[0023] Figure 2 This invention provides a schematic diagram of the structure of a device for accurately metering and conveying low-boiling-point, easily vaporized liquids. Figure 2 ;

[0024] Figure 3 This invention provides a schematic diagram of the structure of a device for accurately metering and conveying low-boiling-point, easily vaporized liquids. Figure 3 .

[0025] In the diagram: 1. Constant pressure valve; 2. Buffer tank; 3. Pressure gauge; 4. Jacketed pipe; 5. Safety exhaust valve; 6. Liquid inlet line; 7. Gas inlet line; 8. Liquid outlet line; 9. Jacket inlet; 10. Jacket outlet; 11. Liquid storage tank; 12. Nitrogen cylinder; 13. Compressor; 14. Metering pump. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example:

[0028] Reference Figure 1-3 A device for accurately metering and conveying low-boiling-point, easily vaporized liquids includes a liquid storage tank 11 and an auxiliary stabilizing conveying device for pressurizing the liquid storage tank 11 to increase the boiling point of the conveyed liquid and decrease its temperature. The auxiliary stabilizing conveying device includes a constant pressure valve 1, a buffer tank 2, a jacketed pipe 4, a nitrogen cylinder 12, and a compressor / refrigeration unit 13. The inlet of the buffer tank 2 is connected to the liquid storage tank 11. The nitrogen cylinder 12 is connected to the inlet of the constant pressure valve 1, and the outlet of the constant pressure valve 1 is connected to the buffer tank 2. The compressor / refrigeration unit 13 is used to input cold air into the jacket of the jacketed pipe 4. The inlet of the jacketed pipe 4 is connected to the buffer tank 2. The outlet end of the buffer tank 2 is connected to the liquid inlet end, the liquid inlet pipe 6 is connected to the liquid outlet end of the buffer tank 2, the liquid inlet pipe 6 is connected to the liquid storage tank 11, the air inlet end of the constant pressure valve 1 is connected to the air inlet pipe 7, the air inlet pipe 7 is connected to the nitrogen cylinder 12, the jacket pipe 4 is provided with a jacket inlet 9 and a jacket outlet 10, the jacket inlet 9 and the jacket outlet 10 are respectively connected to the liquid outlet and liquid inlet of the compressor refrigeration unit 13, the liquid outlet end of the jacket pipe 4 is connected to the liquid outlet pipe 8, the liquid outlet pipe 8 is connected to the jacket pipe 4, the liquid outlet pipe 8 is connected to the safety exhaust valve 5, and the liquid outlet end of the liquid outlet pipe 8 is connected to the metering pump 14.

[0029] When in use, open valve 12 of nitrogen cylinder, and nitrogen enters constant pressure valve 1 through inlet pipeline 7.

[0030] The constant pressure valve 1 regulates the pressure of the incoming nitrogen gas according to the set pressure value, so that the output pressure is stabilized within a suitable range. The stabilized nitrogen gas enters the buffer tank 2 through the outlet end.

[0031] The pressure inside the buffer tank 2 gradually increases, and the pressure is transmitted to the liquid storage tank 11 through the liquid inlet pipeline 6, thereby increasing the pressure inside the liquid storage tank 11 and thus increasing the boiling point of the liquid being transported.

[0032] Cooling process:

[0033] Start the compressor refrigeration unit 13, and the cold air generated by the refrigeration unit enters the jacket space of the jacket tube 4 through the jacket inlet 9.

[0034] When a low-boiling-point, easily vaporized liquid flows out of the buffer tank 2 and passes through the jacketed pipe 4, it exchanges heat with the cold air inside the jacket, causing the liquid temperature to decrease.

[0035] The cooled liquid continues to flow inside the jacketed tube 4. After the cooling process is completed, it flows out from the liquid outlet end of the jacketed tube 4 and enters the liquid outlet line 8.

[0036] Liquid transport process:

[0037] After being pressurized and cooled, the liquid flows through the outlet line 8 to the metering pump 14.

[0038] During the process of liquid flowing through the outlet pipeline 8, the safety vent valve 5 monitors the pressure inside the pipeline in real time. When the pressure exceeds the set safety value, the safety vent valve 5 automatically opens to release some gas or liquid to ensure the stability of the pipeline system pressure and prevent damage to the equipment due to excessive pressure.

[0039] The metering pump 14 continuously and stably delivers the treated low-boiling-point easily vaporized liquid to the target reactor and other equipment to participate in the reaction according to the set flow parameters.

[0040] The pressure gauge 3 connected to the outlet of the buffer tank 2 monitors the output pressure of the liquid in the buffer tank 2 in real time. The operator can adjust the pressure setting value of the constant pressure valve 1 in a timely manner according to the pressure value and the actual production needs to ensure the pressure of the entire conveying system is stable.

[0041] This invention uses an auxiliary stabilizing conveying device to pressurize the liquid storage tank 11, thereby increasing the boiling point of the liquid and reducing its temperature. This reduces the vaporization of the liquid entering the metering pump 14 chamber and prevents gas binding, thus achieving continuous and stable liquid conveying.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for assisting the accurate metering of a low-boiling, easily vaporizable liquid, comprising a liquid reservoir (11), characterized in that, Also includes: An auxiliary stabilizing conveying device is used to pressurize the liquid storage tank (11), increase the boiling point of the conveyed liquid, and decrease the temperature of the conveyed liquid. The auxiliary stabilizing conveying device includes: a constant pressure valve (1), a buffer tank (2), a jacketed pipe (4), a nitrogen cylinder (12), and a compressor refrigeration unit (13); The inlet end of the buffer tank (2) is connected to the liquid storage tank (11); The nitrogen cylinder (12) is connected to the inlet end of the constant pressure valve (1), and the outlet end of the constant pressure valve (1) is connected to the buffer tank (2). The compressor (13) is used to input cold air into the jacket of the jacketed tube (4); The air inlet of the jacket (4) is connected to the air outlet of the buffer tank (2).

2. A device for accurate metering of low boiling point easily vaporizable liquids according to claim 1, characterized in that, The buffer tank (2) is connected to an inlet pipeline (6) at the inlet end, and a pressure gauge (3) is connected to the outlet end of the buffer tank (2). The inlet pipeline (6) is connected to the liquid storage tank (11). The constant pressure valve (1) is connected to an air inlet pipeline (7) at the air inlet end, and the air inlet pipeline (7) is connected to the nitrogen cylinder (12).

3. The device for accurately metering and conveying low-boiling-point, easily vaporized liquids according to claim 2, characterized in that, The jacketed tube (4) is provided with a jacket inlet (9) and a jacket outlet (10), and the jacket inlet (9) and the jacket outlet (10) are respectively connected to the liquid outlet and liquid inlet of the compressor (13).

4. The device for accurately metering and conveying low-boiling-point, easily vaporized liquids according to claim 3, characterized in that, A liquid outlet line (8) is connected to the liquid outlet end of the jacketed tube (4), and the liquid outlet line (8) is connected to the jacketed tube (4).

5. The device for accurately metering and conveying low-boiling-point, easily vaporized liquids according to claim 4, characterized in that, A safety vent valve (5) is connected to the liquid outlet line (8).

6. The device for accurately metering and conveying low-boiling-point, easily vaporized liquids according to claim 5, characterized in that, A metering pump (14) is connected to the outlet end of the outlet pipeline (8).

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