CN216778399U - Multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation - Google Patents
Multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation Download PDFInfo
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- CN216778399U CN216778399U CN202220240936.1U CN202220240936U CN216778399U CN 216778399 U CN216778399 U CN 216778399U CN 202220240936 U CN202220240936 U CN 202220240936U CN 216778399 U CN216778399 U CN 216778399U
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Abstract
The utility model provides a multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation, which relates to the technical field of vacuum pressure swing adsorption and comprises a plurality of groups of centrifugal vacuum pump units which are communicated through pipelines and connected in series, wherein each centrifugal vacuum pump unit comprises a high-speed variable frequency motor and two centrifugal vacuum pump machines which are simultaneously connected to two ends of the high-speed variable frequency motor and driven by the high-speed variable frequency motor, the two centrifugal vacuum pump machines are both communicated with a pipeline for guiding gas, and an inter-stage pipe for guiding gas is communicated between the two centrifugal vacuum pump machines; the control system is used for controlling the plurality of high-speed variable frequency motors. The utility model has the effect of improving the problems of higher cost and relatively lower gas separation efficiency in the prior art of adopting the piston type vacuum pump to separate gas.
Description
Technical Field
The utility model relates to the technical field of vacuum pressure swing adsorption, in particular to a multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation.
Background
A gas separation and purification apparatus is one of apparatuses commonly used in industrial production, wherein Vacuum Pressure Swing Adsorption (VPSA) is one of the most important modes for gas separation and purification. In the separation and purification of various gases, besides conventional gases such as oxygen, nitrogen and the like, the purification of other gases such as hydrogen, carbon dioxide and the like requires high vacuum to analyze the molecular sieve, the vacuum degree can be as high as about-80 KPa, and the ratio of the unit outlet pressure to the inlet total pressure in the whole system can be 7-10.
In the prior art, when a conventional centrifugal unit such as a roots vacuum pump is used for adsorption, the vacuum degree of the conventional centrifugal unit cannot meet the system requirement, or the requirement of a high-vacuum pressure swing adsorption system is difficult to meet due to the reasons of large air inlet pressure change, high pressure ratio and the like. Therefore, the piston vacuum pump which can meet the requirement of high vacuum pressure swing adsorption working condition is adopted to separate and purify the gas in common; however, the pumping capacity of a single piston type vacuum pump is small, and a plurality of vacuum pumps are often required to be connected in parallel for use, so that the investment of a factory building and infrastructure is large, the investment, the cost of transformation, the cost of maintenance and the like are large, and the working efficiency is low.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation, which can solve the problems of high cost and relatively low gas separation efficiency in the prior art of gas separation by adopting a piston type vacuum pump.
According to the embodiment of the utility model, the multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation comprises a plurality of groups of centrifugal vacuum pump units which are communicated through pipelines and connected in series, wherein each centrifugal vacuum pump unit comprises a high-speed variable frequency motor and two centrifugal vacuum pump units which are simultaneously connected to two ends of the high-speed variable frequency motor and driven by the high-speed variable frequency motor, the two centrifugal vacuum pump units are both communicated with a pipeline for guiding gas, and an inter-stage pipe for guiding gas is communicated between the two centrifugal vacuum pump units; the control system is used for controlling the plurality of high-speed variable frequency motors.
Preferably, a stage cooler is arranged between the two groups of centrifugal vacuum pump units connected in series.
Preferably, an inlet valve is arranged on an inlet pipe of each centrifugal vacuum pump unit, an outlet valve is arranged on an outlet pipe of each centrifugal vacuum pump unit, and an interstage valve is arranged between the two centrifugal vacuum pump units which are connected in series; the inlet valve of the next centrifugal vacuum pump set is communicated with the pipeline between the inlet valve of the previous centrifugal vacuum pump set and the centrifugal vacuum pump, and the next centrifugal vacuum pump set is connected in series with the pipeline between the outlet valve of the previous centrifugal vacuum pump set and the centrifugal vacuum pump.
Preferably, the outlet ends of the outlet valves are communicated with a same pipeline, and the pipeline is provided with a main valve for controlling the gas discharge of all the centrifugal vacuum pump units.
Preferably, the interstage valve and the stage cooler are arranged in the same pipeline, and the interstage valve is close to the next group of the centrifugal vacuum pump units relative to the stage cooler.
Preferably, the centrifugal vacuum pump units are arranged in two groups.
Preferably, the centrifugal vacuum pump units are arranged in three groups.
In summary, the utility model includes at least one of the following beneficial technical effects:
1. the piston vacuum pump in the prior art is replaced by a mode of driving two centrifugal vacuum pump machines by using a high-speed variable frequency motor, and the single unit has relatively stronger air extraction capacity, so that the number of units is reduced, the one-time investment and the infrastructure investment are reduced, the maintenance workload is reduced, the maintenance time and the cost are saved, and the aims of solving the problems of higher cost and relatively lower gas separation efficiency in the prior art of adopting the piston vacuum pump for gas separation are fulfilled;
2. through the arrangement of the inlet valve, the outlet valve and the interstage valve, the adaptability adjustment of the serial and parallel states among a plurality of groups of centrifugal vacuum pump units is realized in a valve opening and closing mode, so that the separation work of gas with small or large molecular weight is completed, the separation efficiency is improved, and the separation cost is relatively reduced.
Drawings
FIG. 1 is a schematic view of a first overall structure of an embodiment of the present invention, shown as two sets of centrifugal vacuum pump assemblies;
fig. 2 is a second overall structural schematic diagram of an embodiment of the present invention, shown as three sets of centrifugal vacuum pump assemblies.
In the above drawings: 1. a high-speed variable frequency motor; 2. a centrifugal vacuum pump; 3. an inter-stage pipe; 4. a secondary cooler; 5. an inlet valve; 6. an outlet valve; 7. an interstage valve; 8. a main valve.
Detailed Description
The utility model will be further described with reference to the accompanying figures 1-2.
Referring to fig. 1, the embodiment of the utility model provides a multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation, which comprises a control system and a plurality of groups of centrifugal vacuum pump units, wherein the plurality of groups of centrifugal vacuum pump units are connected in series through a pipeline; the centrifugal vacuum pump unit comprises a high-speed variable frequency motor 1 and two centrifugal vacuum pump machines 2, wherein the high-speed variable frequency motor 1 is controlled by a control system to operate, and the two centrifugal vacuum pump machines 2 are respectively connected to two ends of the high-speed variable frequency motor 1 so as to control the operation of the two centrifugal vacuum pump machines 2 through the high-speed variable frequency motor 1 under the control of the control system; an inter-stage pipe 3 is connected between the two centrifugal vacuum pumps 2 to guide the gas.
When the device is used, the control system controls the high-speed variable frequency motor 1 to simultaneously drive the two centrifugal vacuum pumps 2 to circularly pump negative pressure in an operation period, and the conversion of the rotating speed and the power between the two centrifugal vacuum pumps 2 is realized according to the principle that the high-speed motor can be pulsed, so that the pressure ratio is generated between the inlet of one centrifugal vacuum pump 2 and the outlet of the other centrifugal vacuum pump 2. The high-speed variable frequency motor 1 and the centrifugal vacuum pump 2 directly hung form an integral unit, the unit has the design technical characteristics of low inertia and pulse variable speed, when the inlet pressure is high, the unit runs at a low rotating speed, the consumption of the unit is reduced, and the running rotating speed of the unit is gradually increased along with the reduction of the inlet pressure, so that the pressure ratio of the unit is increased. In the process, pressure sensors and temperature sensors are arranged at the inlet and the outlet of the centrifugal vacuum pump 2, so that the control system can be better controlled by feeding back data.
Compared with the prior art that gas separation is carried out in a mode of connecting a plurality of piston vacuum pumps in parallel, the gas separation is carried out in a mode of connecting a plurality of groups of centrifugal vacuum pump units in series, and the flow rate of one group of centrifugal vacuum pump units can reach more than 10 times of that of the piston vacuum pumps, so that one group of centrifugal vacuum pump units can replace a plurality of sets of piston pumps, the investment of plants and infrastructure is reduced, and the operation cost is reduced; meanwhile, piston machines in the prior art all reciprocate, moving parts of the piston machines all have large mass and low speed, impact load is very large, the service life of the piston machines is short, maintenance workload is huge, spare parts and spare parts are high in consumption, exhaust of a piston vacuum pump is short pulse exhaust, pipe network resonance is easily caused, and system damage is caused.
A stage cooler 4 is arranged between the two groups of centrifugal vacuum pump units connected in series so as to cool the temperature of gas discharged by the first group of centrifugal vacuum pump units and reduce the temperature of a gas inlet of the second group of centrifugal vacuum pump units, so that the temperature of the gas entering the second group of centrifugal vacuum pump units is matched with the power of the second group of centrifugal vacuum pump units, and the air pumping capacity of the subsequent units is improved.
Referring to fig. 2, an inlet valve 5 is arranged on a gas inlet pipe of each centrifugal vacuum pump unit so as to control the gas of the whole centrifugal vacuum pump unit to enter; and an outlet valve 6 is arranged on a gas outlet pipe of each group of centrifugal vacuum pump units so as to control the discharge of the gas of the whole group of centrifugal vacuum pump units. An interstage valve 7 is arranged between two centrifugal vacuum pump units connected in series so as to control the communication between the two centrifugal vacuum pump units in series, the interstage valve 7 and the stage cooler 4 are arranged in the same pipeline, and the interstage valve 7 is close to the next centrifugal vacuum pump unit relative to the stage cooler 4 so that gas entering the interstage valve 7 can be subjected to temperature control through the stage cooler 4.
In the embodiment of the utility model, the inlet valve 5 of the next centrifugal vacuum pump set is communicated with the pipeline between the inlet valve 5 of the previous centrifugal vacuum pump set and the centrifugal vacuum pump 2, so that the inlet valve 5 of the first centrifugal vacuum pump set forms a control valve of the whole centrifugal vacuum pump system to control the gas of the whole system to enter; meanwhile, when the inlet valve 5 of the centrifugal vacuum pump unit of the second group is opened, the gas entering the inlet valve 5 of the centrifugal vacuum pump unit of the previous group can be shunted, and at the moment, the interstage valve 7 is closed, so that the multiple groups of centrifugal vacuum pump units form a parallel structure, and the air suction amount is greatly increased.
The next group of centrifugal vacuum pump units is connected in series to the pipeline between the outlet valve 6 of the previous group of centrifugal vacuum pump units and the centrifugal vacuum pump 2, so that the gas of each group of centrifugal vacuum pump units is controlled to be led out through the outlet valves 6 one by one. The air outlet ends of the outlet valves 6 are communicated with the same pipeline, and a main valve 8 is arranged on the pipeline so as to control the exhaust of the gas of the whole centrifugal vacuum pump system.
Referring to fig. 1, in the embodiment of the present invention, in the use process, for gases with large molecular weight, such as carbon dioxide, a plurality of groups of centrifugal vacuum pump units are arranged into two groups, so as to form a 4-stage series centrifugal vacuum pump by two high-speed variable frequency motors 1, and under the condition of ensuring low cost, the pressure ratio of 1.6-2 is realized by each centrifugal vacuum pump 2 by using the controllable function of parameters (rotating speed and power) of the high-speed motors, so that the pressure ratio of 7-10 is reached by the two groups of centrifugal vacuum pump units, and the requirement of vacuum degree is met.
According to the characteristics of the centrifugal vacuum pump, the flow rate is low at a low rotating speed, the design volume flow rate of the final stage is greatly reduced after multi-stage design, and only one stage of 1/3-1/5 is adopted, so that the flow rate of the centrifugal vacuum pump unit in a series mode is small when the system pressure is high and the starting rotating speed of the unit is low, and the air suction time of the whole system is long.
Therefore, when the inlet pressure is higher, the inlet valve 5 and the outlet valve 6 of the two groups of centrifugal vacuum pump units are opened in order to improve the actual air extraction amount of the centrifugal vacuum pump units, and the main valve 8 is opened, the interstage valve 7 is closed, at the moment, the two groups of centrifugal vacuum pump units are in a parallel connection mode, the air suction quantity of the centrifugal vacuum pump units is greatly increased, after the pressure is reduced to the limit working pressure of the single group of centrifugal vacuum pump units, the outlet valve 6 of the first group of centrifugal vacuum pump units and the inlet valve 5 of the second group of centrifugal vacuum pump units are closed, the interstage valve 7 is opened, so that the two groups of centrifugal vacuum pump units are in a series mode to improve the total pressure ratio capacity, when the minimum pressure required by the system is reached, the system is switched back to the initial starting state, the centrifugal vacuum pump unit is switched to the initial state, and the process is repeated to run circularly so as to improve the treatment efficiency.
Referring to fig. 2, further, in the embodiment of the present invention, in the using process, for a small molecular weight single component or mixed component gas such as hydrogen, methane, etc., the compression difficulty of reaching the same pressure ratio as that of a large molecular weight is greater, so that a plurality of groups of centrifugal vacuum pump units are arranged into three groups, so as to form a 6-stage serial centrifugal vacuum pump by using the technical characteristics of low inertia and variable speed of the centrifugal vacuum pump, and the pressure ratio of 7 to 10 is reached by using three high-speed variable frequency motors 1, so as to meet the requirement of vacuum degree.
When the inlet pressure of the initial point is high, the inlet valve 5 and the outlet valve 6 of the three groups of centrifugal vacuum pump units are opened, the main valve 8 is opened, the two interstage valves 7 are closed, and the three groups of centrifugal vacuum pump units are all operated in a parallel state.
When the pressure is lower than the ultimate working capacity of a single centrifugal vacuum pump unit, closing the outlet valve 6 of the first group of centrifugal vacuum pump units and the inlet valve 5 of the second group of centrifugal vacuum pump units, opening the interstage valve 7 and the main valve 8, keeping the states of other valves unchanged, keeping the second group of centrifugal vacuum pump units and the third group of centrifugal vacuum pump units in a parallel state, connecting the second group of centrifugal vacuum pump units and the first group of centrifugal vacuum pump units in series, and continuously vacuumizing the system. And when the inlet pressure continues to be reduced and the maximum working capacity is reached, closing the outlet valves 6 of the first group and the second group of centrifugal vacuum pump units, the inlet valves 5 of the second group and the third group of centrifugal vacuum pump units, and opening the interstage valves 7 and the main valve 8 to enable all the units to be connected in series, when the minimum pressure required by the system is reached, switching the system back to the initial starting state, switching the centrifugal vacuum pump units to the initial state, and repeating the process for circulating operation.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation is characterized in that: the device comprises a plurality of groups of centrifugal vacuum pump units which are communicated through pipelines and are connected in series, wherein each centrifugal vacuum pump unit comprises a high-speed variable frequency motor (1) and two centrifugal vacuum pump machines (2) which are simultaneously connected to two ends of the high-speed variable frequency motor (1) and driven by the high-speed variable frequency motor (1), the two centrifugal vacuum pump machines (2) are both communicated with a pipeline for guiding gas, and an inter-stage pipe (3) for guiding gas is communicated between the two centrifugal vacuum pump machines (2); the control system is used for controlling the high-speed variable frequency motors (1).
2. A multistage high speed direct drive centrifugal vacuum pump system for VPSA gas separation as claimed in claim 1 wherein: and a stage cooler (4) is arranged between the two groups of centrifugal vacuum pump units connected in series.
3. A multistage high speed direct drive centrifugal vacuum pump system for VPSA gas separation as claimed in claim 2 wherein: an inlet valve (5) is arranged on an inlet pipe of each group of centrifugal vacuum pump units, an outlet valve (6) is arranged on an outlet pipe, and an interstage valve (7) is arranged between the two groups of centrifugal vacuum pump units which are connected in series; the inlet valve (5) of the next centrifugal vacuum pump unit is communicated with the pipeline between the inlet valve (5) of the previous centrifugal vacuum pump unit and the centrifugal vacuum pump (2), and the next centrifugal vacuum pump unit is connected in series with the pipeline between the outlet valve (6) of the previous centrifugal vacuum pump unit and the centrifugal vacuum pump (2).
4. A multistage high speed direct drive centrifugal vacuum pump system for VPSA gas separation as claimed in claim 3 wherein: and the air outlet ends of the outlet valves (6) are communicated with the same pipeline, and the pipeline is provided with a main valve (8) for controlling the air discharge of all the centrifugal vacuum pump units.
5. A multistage high speed direct drive centrifugal vacuum pump system for VPSA gas separation as claimed in claim 3 wherein: the interstage valve (7) and the intercooler (4) are arranged in the same pipeline, and the interstage valve (7) is close to the next group of centrifugal vacuum pump units relative to the intercooler (4).
6. A multistage high speed direct drive centrifugal vacuum pump system for VPSA gas separation according to any of claims 1-5, characterized in that: the multiple groups of centrifugal vacuum pump units are arranged into two groups.
7. A multistage high speed direct drive centrifugal vacuum pump system for VPSA gas separation according to any of claims 1-5, characterized in that: the centrifugal vacuum pump units are arranged into three groups.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220240936.1U CN216778399U (en) | 2022-01-28 | 2022-01-28 | Multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation |
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| CN202220240936.1U CN216778399U (en) | 2022-01-28 | 2022-01-28 | Multistage high-speed direct-drive centrifugal vacuum pump system for VPSA gas separation |
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| CN216778399U true CN216778399U (en) | 2022-06-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115434902A (en) * | 2022-11-07 | 2022-12-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-flow high-vacuum air pumping system and design method thereof |
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- 2022-01-28 CN CN202220240936.1U patent/CN216778399U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115434902A (en) * | 2022-11-07 | 2022-12-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-flow high-vacuum air pumping system and design method thereof |
| CN115434902B (en) * | 2022-11-07 | 2022-12-30 | 中国空气动力研究与发展中心超高速空气动力研究所 | Design method of high-flow high-vacuum air pumping system |
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