CN112879292A - Liquid ring pump working liquid temperature control system and control method thereof - Google Patents
Liquid ring pump working liquid temperature control system and control method thereof Download PDFInfo
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- CN112879292A CN112879292A CN202110293454.2A CN202110293454A CN112879292A CN 112879292 A CN112879292 A CN 112879292A CN 202110293454 A CN202110293454 A CN 202110293454A CN 112879292 A CN112879292 A CN 112879292A
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- liquid ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
- F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/19—Temperature
- F04C2270/195—Controlled or regulated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/78—Warnings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/86—Detection
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of liquid ring pumps, in particular to a working liquid temperature control system of a liquid ring pump and a control method thereof, wherein the working liquid temperature control system comprises a liquid ring pump, a steam-water separator and a heat exchanger, a first temperature transmitter is arranged between the steam-water separator and the heat exchanger, a third temperature transmitter and a first flowmeter are arranged between the liquid ring pump and the heat exchanger, and a second flowmeter, a second temperature transmitter and an automatic regulating valve are sequentially arranged at a chilled water inlet of the heat exchanger; the first temperature transmitter, the automatic regulating valve, the second temperature transmitter, the third temperature transmitter, the first flowmeter and the second flowmeter are respectively connected with the control module. The invention realizes the control of the temperature of the working fluid of the liquid ring pump, ensures the temperature of the working fluid of the liquid ring pump to be the temperature required by the working condition, not only ensures the ultimate vacuum degree and the air exhaust performance, but also avoids the waste of the energy of the chilled water, greatly improves the operation stability of the liquid ring pump unit and the adaptability to the working condition, and ensures the production efficiency.
Description
Technical Field
The invention belongs to the technical field of liquid ring pumps, and particularly relates to a liquid ring pump working liquid temperature control system and a control method thereof.
Background
The liquid ring pump needs to use liquid as the working solution at the during operation, the temperature of working solution can influence the saturated steam pressure of the inside working solution of liquid ring pump in the operation process, thereby influence the ultimate vacuum degree that liquid ring vacuum pump can reach and the performance of bleeding, prior art generally only is through some simple refrigeration plant, like the heat exchanger etc., help the cooling, but because can produce the heat in the compression process of liquid ring pump work, cause the working solution temperature to rise, only can reach a dynamic balance through the heat exchanger cooling, can not play the effect of adjusting the working solution temperature. The actual working fluid temperature can deviate from the numerical value calculated by the model selection, so that the working fluid temperature is easily caused to be higher or lower, and the working fluid temperature is higher, on one hand, the saturated vapor pressure of the working fluid in the liquid ring pump is caused to be higher, so that the ultimate vacuum degree and the air extraction performance which can be achieved by the liquid ring vacuum pump are influenced, and on the other hand, in some chemical production processes, some useful substances of the working fluid are easily vaporized, so that the normal operation of the liquid ring pump is influenced; the working solution temperature is lower than normal, and on the one hand, it shows that the frozen water volume is too big, and the frozen water needs the refrigerator to come the refrigeration, and this has just caused the energy waste of frozen water and refrigerator, and on the other hand probably can make some useful substances in the working solution produce the crystallization to influence the normal operating of liquid ring pump, lead to unable normal production, seriously influence production efficiency.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the liquid ring pump working liquid temperature control system and the control method thereof, which realize the control of the temperature of the working liquid of the liquid ring pump, ensure that the working liquid temperature of the liquid ring pump is the temperature required by the working condition, ensure the ultimate vacuum degree and the air exhaust performance, avoid the waste of chilled water energy, greatly improve the operation stability of a liquid ring pump unit and the adaptability to the working condition, and ensure the production efficiency. The technical problem to be solved by the invention is realized by the following technical scheme:
a liquid ring pump working liquid temperature control system comprises a liquid ring pump, a steam-water separator and a heat exchanger, wherein a water inlet of the liquid ring pump is connected with one end of the heat exchanger, a water outlet of the liquid ring pump is connected with a water inlet of the steam-water separator, a water outlet of the steam-water separator is connected with the other end of the heat exchanger, a first temperature transmitter is arranged between the steam-water separator and the heat exchanger, a third temperature transmitter and a first flowmeter are arranged between the liquid ring pump and the heat exchanger, and a second flowmeter, a second temperature transmitter and an automatic regulating valve are sequentially arranged at a chilled water inlet of the heat exchanger; the first temperature transmitter, the automatic regulating valve, the second temperature transmitter, the third temperature transmitter, the first flowmeter and the second flowmeter are respectively connected with the control module.
Further, the control module includes an input unit, an output unit, a storage unit, and a processor.
A control method of a liquid ring pump working liquid temperature control system is characterized by comprising the following steps:
step one, setting a working solution temperature as Tr according to actual working condition requirements;
step two, the third temperature transmitter sends the detected real-time temperature Tp of the working fluid to the control module, the second temperature transmitter sends the detected chilled water temperature tc of the heat exchanger to the control module, when tc is larger than Tp, an alarm is sent, the machine needs to be stopped to detect faults, and otherwise, the step three is executed;
step three, when Tp is equal to Tr, returning to step two, otherwise, executing step four;
step four, the first flow meter sends the detected working fluid circulation flow Fp of the liquid ring pump to a control module, the first temperature transmitter sends the detected temperature Td of the working fluid discharged by the liquid ring pump to the control module, the second temperature transmitter sends the detected temperature tc of the chilled water of the heat exchanger to the control module, the control module calculates the required chilled water flow Fc according to a set formula by using all the acquired data, and when Tp is more than Tr, the fifth step is executed; when Tp is less than Tr, executing step six;
step five, as Tp is larger than Tr, the flow Fc of the chilled water is larger than the flow Fa detected by the second flow meter, the control module controls the automatic regulating valve to increase the opening degree, so that the flow of the chilled water is increased, when (Fc-Fa)/Fc is larger than 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 5% per second quickly, when (Fc-Fa)/Fc is smaller than or equal to 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 1% per second slowly until Fa is equal to Fc, and the step seven is executed;
step six, as Tp is less than Tr, the flow Fc of the chilled water is less than the flow Fa detected by the second flow meter, the control module controls the automatic regulating valve to close and open, so that the flow of the chilled water is reduced, when (Fa-Fc)/Fc is more than 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 5% per second quickly, when (Fa-Fc)/Fc is less than or equal to 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 1% per second slowly until Fa is equal to Fc, and the step seven is executed;
and step seven, repeating the step two.
Further, the calculation formula of the required flow rate Fc of the chilled water in the fourth step is as follows: fc ═ K × S × Fp | Td-Tr |/(K × S [ (+ Td-2 × tc) - ] Fp × 2000 × Td-Tr |).
Specifically, in the calculation formula, K is a heat transfer coefficient of the heat exchanger, S is a heat exchange area of the heat exchanger, Fp is a working fluid circulation flow rate of the liquid ring pump, Td is a discharged working fluid temperature of the liquid ring pump, Tr is a working fluid temperature set according to actual working condition requirements, and tc is a chilled water temperature of the heat exchanger.
The invention realizes the control of the temperature of the working fluid of the liquid ring pump, ensures that the temperature of the working fluid of the liquid ring pump is the temperature required by the working condition, not only ensures the ultimate vacuum degree and the air exhaust performance, but also avoids the waste of the energy of the chilled water, greatly improves the operation stability of the liquid ring pump unit and the adaptability to the working condition, and ensures the production efficiency; the invention can monitor the temperature and the flow of the working fluid of the liquid ring pump in real time and early warn in real time, thereby avoiding the fault or damage to the liquid ring pump unit caused by overhigh temperature or too low flow of the working fluid.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, and as shown in fig. 1, a liquid ring pump working fluid temperature control system includes a liquid ring pump 1, a steam-water separator 2 and a heat exchanger 4, a water inlet of the liquid ring pump 1 is connected with one end of the heat exchanger 4, a water outlet of the liquid ring pump 1 is connected with a water inlet of the steam-water separator 2, a water outlet of the steam-water separator 2 is connected with the other end of the heat exchanger 4, a first temperature transmitter 3 is arranged between the steam-water separator 2 and the heat exchanger 4, a third temperature transmitter 7 and a first flow meter 8 are arranged between the liquid ring pump 1 and the heat exchanger 4, and a second flow meter 10, a second temperature transmitter 6 and an automatic regulating valve 5 are sequentially arranged at a chilled water inlet of the heat exchanger 4; the first temperature transmitter 3, the automatic regulating valve 5, the second temperature transmitter 6, the third temperature transmitter 7, the first flowmeter 8 and the second flowmeter 10 are respectively connected with the control module 9.
When the device works, required working liquid is introduced into the steam-water separator 2, the working liquid passes through the heat exchanger 4 and then is led into the liquid ring pump 1 for use, when the liquid ring pump 1 runs, the working liquid forms a liquid ring in the pump to finish gas suction, sucked gas can be discharged back into the steam-water separator 2 together with the working liquid, the gas is separated and discharged to a specified place, and the working liquid is separated and returned into the steam-water separator 2 for recycling; the invention utilizes the automatic regulating valve 5 to regulate the water supply quantity of the chilled water to control the temperature of the working fluid, and the control module 9 comprises an input unit, an output unit, a storage unit and a processor and controls and coordinates the normal work of various transmitters and components according to preset programs and instructions.
A control method of a liquid ring pump working liquid temperature control system comprises the following steps:
step one, setting the temperature of a working fluid to be Tr according to the actual working condition requirement.
And step two, the third temperature transmitter 7 sends the detected real-time temperature Tp of the working fluid to the control module 9, the second temperature transmitter 6 sends the detected chilled water temperature tc of the heat exchanger 4 to the control module 9, when tc is larger than Tp, an alarm is sent, the machine needs to be stopped to detect faults, and otherwise, the step three is executed.
And step three, when Tp is equal to Tr, returning to step two, otherwise, executing step four.
Step four, the first flow meter 8 sends the detected working fluid circulation flow Fp of the liquid ring pump to the control module 9, the first temperature transmitter 3 sends the detected temperature Td of the working fluid discharged by the liquid ring pump to the control module 9, the second temperature transmitter 6 sends the temperature tc of the chilled water of the heat exchanger 4 to the control module 9, the control module 9 calculates the required flow Fc of the chilled water according to a set formula by using all the acquired data, and when Tp is more than Tr, the fifth step is executed; when Tp < Tr, step six is performed.
Step five, as Tp is larger than Tr, the flow Fc of the chilled water is larger than the flow Fa detected by the second flow meter 10, the control module 9 controls the automatic regulating valve 5 to increase the opening degree, so that the flow of the chilled water is increased, when (Fc-Fa)/Fc is larger than 10%, the control module 9 controls the regulating speed of the automatic regulating valve 5 to be adjusted at a speed of 5% per second at a higher speed, when (Fc-Fa)/Fc is smaller than or equal to 10%, the control module 9 controls the regulating speed of the automatic regulating valve 5 to be adjusted at a speed of 1% per second at a lower speed until Fa is equal to Fc, and the step seven is executed.
Step six, as Tp is less than Tr, the flow Fc of the chilled water is less than the flow Fa detected by the second flow meter 10, the control module 9 controls the automatic regulating valve 5 to close by an opening degree, so that the flow of the chilled water is reduced, when (Fa-Fc)/Fc is greater than 10%, the control module 9 controls the regulating speed of the automatic regulating valve 5 to be adjusted at a speed of 5% per second at a higher speed, when (Fa-Fc)/Fc is less than or equal to 10%, the control module 9 controls the regulating speed of the automatic regulating valve 5 to be adjusted at a speed of 1% per second at a lower speed until Fa is equal to Fc, and the step seven is executed.
And step seven, repeating the step two.
The calculation formula of the required flow Fc of the chilled water in the step four is as follows: fc ═ K × S × Fp | Td-Tr |/(K × S [ (+ Td + Tr-2 × tc) -Fp | 2000 | Td-Tr |); in the formula, K is the heat transfer coefficient (Kcal/m) of the heat exchanger2H. DEG C), S is a heat exchangerHeat exchange area (m)2) Fp is the circulation flow (m) of the working fluid of the liquid ring pump3And/h) that can be detected by the first flowmeter 8, Td is the discharged working fluid temperature (deg.C) of the liquid ring pump and can be detected by the first temperature transmitter 3, Tr is the working fluid temperature (deg.C) set according to the actual working condition requirements, and tc is the chilled water temperature (deg.C) of the heat exchanger 4 and can be detected by the second temperature transmitter 6.
The control method of the present invention is further illustrated in the following two examples:
example one
Step one, setting a working solution temperature Tr to be 25 ℃ according to actual working condition requirements.
And step two, the third temperature transmitter 7 sends the detected real-time temperature Tp of the working fluid to the control module 9, the second temperature transmitter 6 sends the detected temperature tc of the chilled water of the heat exchanger 4 to the control module 9, and step three is executed because the temperature tc is 20 ℃ and is less than Tp which is 30 ℃, and step four is executed because Tp which is 30 ℃ and more than Tr which is 25 ℃.
Step four, the first flow meter 8 detects that the circulating flow Fp of the working fluid of the liquid ring pump is 10m3The temperature Td of the working fluid discharged by the liquid ring pump is 38 ℃ and is sent to the control module 9, the temperature tc of the chilled water of the heat exchanger 4 is 20 ℃ and is detected by the second temperature transmitter 6, the temperature Td is sent to the control module 9, the control module 9 calculates the required flow Fc of the chilled water according to a set formula by using all collected data, wherein the heat transfer coefficient K of the heat exchanger is 860Kcal/m2H, DEG C, the heat exchange area S of the heat exchanger is 10m2，Fc＝K*S*Fp*| Td-Tr |/(K*S*(Td+Tr-2*tc)-Fp*2000*| Td-Tr|)＝860*10*10*|38-25|/(860*10*(38+25-2*20)-10*2000*|38-25|)≈10.4m3/h
Since Tp > Tr, step five is performed.
Step five, the flow rate Fa detected by the second flowmeter 10 is 6m3And h, the control module 9 controls the automatic regulating valve 5 to increase the opening degree because Fc is 10.4 and Fa is 6, so that the flow rate of the frozen water is increased, and at the moment, (Fc-Fa)/Fc is (10.4-6)/10.4 is 42.3 percent, the control module 9 controls the automatic regulating valve 5The adjusting speed is adjusted quickly at the speed of 5% per second, when (Fc-Fa)/Fc is less than or equal to 10%, the control module 9 controls the adjusting speed of the automatic adjusting valve 5 to be adjusted slowly at the speed of 1% per second, and the real-time temperature Tp of the working solution is slowly reduced due to the increase of the freezing water quantity until the flow Fa detected by the second flow meter 10 is 10.4m3And h, executing the step seven.
And step seven, repeating the step two.
Example two
Step one, setting a working solution temperature Tr to be 50 ℃ according to actual working condition requirements.
And step two, the third temperature transmitter 7 sends the detected real-time temperature Tp of the working fluid to the control module 9, the second temperature transmitter 6 sends the detected temperature tc of the chilled water of the heat exchanger 4 to the control module 9, and step three is executed because the temperature tc is 20 ℃ and is less than Tp which is 40 ℃, and step four is executed because the temperature Tp is 40 ℃ and is less than Tr which is 50 ℃.
Step four, the first flow meter 8 detects that the circulating flow Fp of the working fluid of the liquid ring pump is 10m3The temperature Td of the working fluid discharged by the liquid ring pump and detected by the first temperature transmitter 3 is 45 ℃, the temperature Td of the working fluid discharged by the liquid ring pump is sent to the control module 9, the temperature tc of the chilled water of the heat exchanger 4 detected by the second temperature transmitter 6 is 20 ℃, the temperature Td is sent to the control module 9, the control module 9 calculates the required flow Fc of the chilled water according to a set formula by using all collected data, wherein the heat transfer coefficient K of the heat exchanger is 860Kcal/m2H, DEG C, the heat exchange area S of the heat exchanger is 10m2，Fc＝K*S*Fp*|Td-Tr|/(K*S*(Td+Tr-2*tc)-Fp*2000*|Td-Tr|)＝860*10*10*|45-50|/(860*10*(45+50-2*20)-10*2000*|45-50|)≈1.1m3/h
Since Tp < Tr, step six is performed.
Step six, the flow rate Fa detected by the second flowmeter 10 is 6m3And/h, as Fc is 1.1 < Fa 6, the control module 9 controls the automatic regulating valve 5 to close and open to reduce the flow of the frozen water, at the moment, (Fa-Fc)/Fc is (6-1.1)/1.1 is 445.5%, the control module 9 controls the regulating speed of the automatic regulating valve 5 to be quickly regulated at the speed of 5% per second, and when (Fa-Fc)/Fc is less than or equal to 10%, the control module controls the control module to control the regulating speed of the automatic regulating valve 5 to be quickly regulated at the speed of 5% per secondThe block 9 controls the regulating speed of the automatic regulating valve 5 to be slowly adjusted at the speed of 1 percent per second, and the real-time temperature Tp of the working solution is slowly increased due to the reduction of the frozen water quantity until the flow Fa detected by the second flowmeter 10 is 1.1m3And h, executing the step seven.
And step seven, repeating the step two.
In a word, the temperature of the working fluid of the liquid ring pump is controlled, the temperature of the working fluid of the liquid ring pump is ensured to be the temperature required by the working condition, the ultimate vacuum degree and the air exhaust performance are ensured, the waste of the energy of the chilled water is avoided, the operation stability of the liquid ring pump unit and the adaptability to the working condition are greatly improved, and the production efficiency is ensured; the invention can monitor the temperature and the flow of the working fluid of the liquid ring pump in real time and early warn in real time, thereby avoiding the fault or damage to the liquid ring pump unit caused by overhigh temperature or too low flow of the working fluid.
Claims (5)
1. A liquid ring pump working liquid temperature control system comprises a liquid ring pump, a steam-water separator and a heat exchanger, wherein a water inlet of the liquid ring pump is connected with one end of the heat exchanger, a water outlet of the liquid ring pump is connected with a water inlet of the steam-water separator, and a water outlet of the steam-water separator is connected with the other end of the heat exchanger; the first temperature transmitter, the automatic regulating valve, the second temperature transmitter, the third temperature transmitter, the first flowmeter and the second flowmeter are respectively connected with the control module.
2. The liquid ring pump working liquid temperature control system according to claim 1, wherein the control module includes an input unit, an output unit, a storage unit, and a processor.
3. A control method of a hydraulic fluid temperature control system of a liquid ring pump according to claims 1 and 2, characterized by comprising the steps of:
step one, setting a working solution temperature as Tr according to actual working condition requirements;
step two, the third temperature transmitter sends the detected real-time temperature Tp of the working fluid to the control module, the second temperature transmitter sends the detected chilled water temperature tc of the heat exchanger to the control module, when tc is larger than Tp, an alarm is sent, the machine needs to be stopped to detect faults, and otherwise, the step three is executed;
step three, when Tp is equal to Tr, returning to step two, otherwise, executing step four;
step four, the first flow meter sends the detected working fluid circulation flow Fp of the liquid ring pump to a control module, the first temperature transmitter sends the detected temperature Td of the working fluid discharged by the liquid ring pump to the control module, the second temperature transmitter sends the detected temperature tc of the chilled water of the heat exchanger to the control module, the control module calculates the required chilled water flow Fc according to a set formula by using all the acquired data, and when Tp is more than Tr, the fifth step is executed; when Tp is less than Tr, executing step six;
step five, as Tp is larger than Tr, the flow Fc of the chilled water is larger than the flow Fa detected by the second flow meter, the control module controls the automatic regulating valve to increase the opening degree, so that the flow of the chilled water is increased, when (Fc-Fa)/Fc is larger than 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 5% per second quickly, when (Fc-Fa)/Fc is smaller than or equal to 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 1% per second slowly until Fa is equal to Fc, and the step seven is executed;
step six, as Tp is less than Tr, the flow Fc of the chilled water is less than the flow Fa detected by the second flow meter, the control module controls the automatic regulating valve to close and open, so that the flow of the chilled water is reduced, when (Fa-Fc)/Fc is more than 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 5% per second quickly, when (Fa-Fc)/Fc is less than or equal to 10%, the control module controls the regulating speed of the automatic regulating valve to be regulated at a speed of 1% per second slowly until Fa is equal to Fc, and the step seven is executed;
and step seven, repeating the step two.
4. The method for controlling a working fluid temperature control system of a liquid ring pump according to claim 3, wherein the calculation formula of the required flow rate Fc of the chilled water in the fourth step is as follows: fc ═ K × S × Fp | Td-Tr |/(K × S [ (+ Td-2 × tc) - ] Fp × 2000 × Td-Tr |).
5. The control method of the liquid ring pump working fluid temperature control system according to claim 4, wherein in the calculation formula, K is a heat transfer coefficient of the heat exchanger, S is a heat exchange area of the heat exchanger, Fp is a working fluid circulation flow rate of the liquid ring pump, Td is a discharged working fluid temperature of the liquid ring pump, Tr is a working fluid temperature set according to actual working condition requirements, and tc is a chilled water temperature of the heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110293454.2A CN112879292A (en) | 2021-03-18 | 2021-03-18 | Liquid ring pump working liquid temperature control system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110293454.2A CN112879292A (en) | 2021-03-18 | 2021-03-18 | Liquid ring pump working liquid temperature control system and control method thereof |
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| CN112879292A true CN112879292A (en) | 2021-06-01 |
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| CN202110293454.2A Pending CN112879292A (en) | 2021-03-18 | 2021-03-18 | Liquid ring pump working liquid temperature control system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013315A (en) * | 2022-06-09 | 2022-09-06 | 华能国际电力股份有限公司丹东电厂 | Energy-saving operation method for cooling water of vacuum pump of large-scale steam turbine unit |
-
2021
- 2021-03-18 CN CN202110293454.2A patent/CN112879292A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013315A (en) * | 2022-06-09 | 2022-09-06 | 华能国际电力股份有限公司丹东电厂 | Energy-saving operation method for cooling water of vacuum pump of large-scale steam turbine unit |
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