CN113074113A - Efficiency improving device of water-ring vacuum pump and control method - Google Patents
Efficiency improving device of water-ring vacuum pump and control method Download PDFInfo
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- CN113074113A CN113074113A CN202110475193.6A CN202110475193A CN113074113A CN 113074113 A CN113074113 A CN 113074113A CN 202110475193 A CN202110475193 A CN 202110475193A CN 113074113 A CN113074113 A CN 113074113A
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- water
- vacuum pump
- ring vacuum
- cold water
- water 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
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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
- F04C28/28—Safety arrangements; Monitoring
Abstract
The invention discloses a water ring vacuum pump efficiency improving device and a control method, and particularly relates to the field of industrial machinery. The method can comprehensively and effectively judge the running state of the water-ring vacuum pump, and can quickly switch to a normal running mode or interlockingly stop the water-ring vacuum pump once the system fails, thereby ensuring the running safety of the whole unit.
Description
Technical Field
The embodiment of the invention relates to the field of industrial machinery, in particular to an effect-improving device of a water-ring vacuum pump and a control method, which are suitable for thermal power generation enterprises provided with the water-ring vacuum pump as a negative pressure system suction tool and are also suitable for industries such as electric power, metallurgy, steel, petrifaction, oil refining and the like provided with the water-ring vacuum pump.
Background
In the thermal power generation industry, a water ring vacuum pump is widely applied as a suction tool for vacuum establishment before a negative pressure system is started, non-condensable gas in the negative pressure system in the operation process is continuously pumped out, high vacuum of the negative pressure system is maintained, the overall thermodynamic cycle efficiency is improved, and the power generation coal consumption is reduced. The negative pressure system of the unit is huge, particularly in a low-load stage, after the system leaks, due to on-site noise and uncertainty of the leakage position of the negative pressure system, the leakage position is difficult to find in time, and therefore the water ring vacuum pump serving as a suction tool is required to improve output power, suck leaked gas out and maintain high vacuum of the negative pressure system. However, due to the limitation of the design conditions and the field conditions of the water-ring vacuum pump, when the temperature of sealing water in the vacuum pump body rises due to mechanical work, friction, heat transfer and the like, sealing water at the air suction end face and the air exhaust end face of the pump body is vaporized, the efficiency of the vacuum pump is seriously reduced, closed cooling water or open cooling water serving as sealing water cooling water of the vacuum pump is limited by environmental conditions, the temperature in summer is high, for example, a certain power plant in a Bohai Bay, the temperature of seawater in summer reaches 30 ℃, and the temperature of the closed cooling water serving as working fluid cooling water of the vacuum pump reaches 33 ℃, so that the sealing water of the vacuum pump cannot be effectively cooled, the efficiency of the. The fresh water replenishing of the thermal power plant is usually to be pumped from the bottom of a large reservoir or underground deep well water, the temperature of the water sources is very low in summer and is always kept between 12 ℃ and 20 ℃, the cold source can be completely utilized by a water ring vacuum pump as sealing water of the vacuum pump, the pumping efficiency of the vacuum pump is improved, even if a power plant without deep well underground water or deep water sources of the reservoir does not exist, the chilled water of a central air conditioner can be utilized as the sealing water of the vacuum pump, the cold water is utilized as a sealing water source of the vacuum pump and how to efficiently utilize the low-temperature water source, and the safety and the stability of the operation of the vacuum pump are guaranteed.
Disclosure of Invention
Therefore, the embodiment of the invention provides an effect-improving device and a control method for a water-ring vacuum pump, so as to solve the problems in the background art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a water ring vacuum pump efficiency improving device comprises a water ring vacuum pump and a DCS control system, wherein a cold water replenishing pipe is fixed on a rear pipeline of a sealing water cooler of the water ring vacuum pump, a sealing water cold water replenishing water source is introduced by the cold water replenishing pipe, a sealing water pneumatic normal water replenishing valve is fixed on the cold water replenishing pipe, a temperature sensor is installed behind the sealing water pneumatic normal water replenishing valve and connected with the DCS control system, a pneumatic cold water replenishing valve is fixed on the cold water replenishing pipe, a manual stop valve is installed behind the pneumatic cold water replenishing valve, a pressure sensor is installed on a front pipeline of the pneumatic cold water replenishing valve, and the pressure sensor is connected with the DCS control system;
the outlet of the water ring vacuum pump is provided with a gas-water separator through a pipeline, the gas-water separator and the horizontal center line position height position of the water ring vacuum pump body are provided with an overflow pipe, an open overflow observer is fixed on the overflow pipe, a water level sensor is fixed inside the gas-water separator, and the water level sensor is connected with a DCS control system.
Further, the pipe diameter of the cold water replenishing pipe is 50mm, and the measuring range of the temperature sensor is between 10 ℃ and 50 ℃.
Further, the pressure sensor measures in the range of 0-1 MPa.
Further, the overflow pipe diameter is 75mm, the shape of overflow viewer is funnel-shaped.
Further, the cold water source of the water ring vacuum pump can utilize underground water of a water source place of a power plant or cold water at the bottom of a reservoir.
The invention also comprises a control method of the effect lifting device of the water-ring vacuum pump, which comprises the following steps:
the method comprises the following steps: before the water ring vacuum pump is started, the original sealed water pneumatic normal water replenishing valve is closed, the pneumatic cold water replenishing valve is opened, the overflow of the gas-water separator is detected to be normal through an overflow observer, the ring vacuum pump is started, and a manual stop valve is adjusted to keep the overflow quantity of the gas-water separator at 1.5t/h-2 t/h;
step two: a pressure sensor is arranged in front of a cold water replenishing valve, in normal operation, the cold water pressure display value is between 0.3MPa and 0.5MPa, the original sealed water cooler is still put into a standby state, once the cold water pressure display is reduced to be below 0.1MPa, the DCS control system automatically controls the pressure sensor, the sealed water pneumatic normal water replenishing valve is interlocked and opened, and meanwhile, the cold water replenishing valve is closed, so that the water ring vacuum pump recovers the operation mode;
step three: a temperature sensor is arranged behind a cold water replenishing valve and used for monitoring the water temperature of the sealing water of the water ring vacuum pump in operation, when the water temperature is close to the saturation temperature corresponding to the inlet pressure of the water ring vacuum pump, the fact that the sealing water is close to a vaporization edge is indicated, the output of the water ring vacuum pump is about to drop, and whether the efficiency of a cold water source or a heat exchanger drops or not is checked in time;
step four: a water level sensor is arranged on a gas-water separator at the outlet of a water ring type vacuum pump, liquid level data are transmitted to a DCS control system for monitoring, in normal operation, the liquid level of the gas-water separator is 20mm above the horizontal center line of the water ring type vacuum pump, once the liquid level is reduced below the horizontal center line of the water ring type vacuum pump, the fact that the sealing water quantity in the water ring type vacuum pump is insufficient is indicated, at the moment, the DCS control system automatically controls the water ring type vacuum pump, a sealing water pneumatic normal water replenishing valve is opened in an interlocking mode, a cold water replenishing valve is closed, the sealing water of the water ring type vacuum pump is cut to the original operation mode, and once the liquid level continues to descend to the pump body/liquid level.
The embodiment of the invention has the following advantages:
1. according to the invention, the operating state of the water-ring vacuum pump can be comprehensively and effectively judged through the pressure sensor, the temperature sensor and the water level sensor which are arranged in the system, once the system fails, the system can be quickly switched to a normal operating mode, or the water-ring vacuum pump can be interlockingly stopped, so that the operating safety of the whole unit is ensured;
2. according to the invention, the overflow observer arranged on the overflow pipeline can ensure that a person on duty can intuitively judge the running state of the pump when checking the water-ring vacuum pump;
3. the cold water source of the water ring vacuum pump can utilize underground water of a water source place of a power plant or cold water at the bottom of a reservoir, and the water temperature is about 12-20 ℃ in summer in 7-8 months, and because the water change amount of the water ring vacuum pump is small, even if a power plant without underground water or water at the bottom of the reservoir, such as a power plant using urban water treatment as a water source or a power plant using seawater desalination as a water source, the chilled water of a central air conditioner can be used as the cold water replenishing water source of the water ring vacuum pump, so that the refrigeration burden of the central air conditioner cannot be greatly increased, and the unit can improve the obvious operation efficiency;
4. the overflow water of the gas-water separator at the outlet of the water ring vacuum pump can be introduced into a fire pool or an industrial pool for reuse, so that the waste of water resources is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is an overall schematic diagram provided by the present invention;
FIG. 2 is a view showing the installation position and the arrangement of a newly introduced cold water replenishing pipe according to the present invention;
FIG. 3 is a schematic view of the installation of the gas-water separator and the overflow pipe at the outlet of the water ring vacuum pump provided by the invention;
in the figure: the system comprises a water ring vacuum pump 1, a DCS control system 2, a sealed water cooler 3, a sealed water pneumatic normal water replenishing valve 4, a pneumatic cold water replenishing valve 5, a manual stop valve 6, a gas-water separator 7, an overflow pipe 8, an overflow observer 9 and a water level sensor 10.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme takes the example that a certain thermal power plant utilizes reservoir deep water as a vacuum pump cold water replenishing water source as an example: referring to the attached drawings 1-3 of the specification, the invention provides a water ring vacuum pump efficiency improving device which comprises a water ring vacuum pump 1 and a DCS control system 2, wherein a cold water replenishing pipe is fixed on a rear pipeline of a sealing water cooler 3 of the water ring vacuum pump 1, a sealing water cold water replenishing water source is introduced by the cold water replenishing pipe, a sealing water pneumatic normal water replenishing valve 4 is fixed on the cold water replenishing pipe, a temperature sensor is installed behind the sealing water pneumatic normal water replenishing valve 4 and connected with the DCS control system 2, a pneumatic cold water replenishing valve 5 is fixed on the cold water replenishing pipe, a manual stop valve 6 is installed behind the pneumatic cold water replenishing valve 5 and used for water quantity adjustment and isolation and maintenance, a pressure sensor is installed on a front pipeline of the pneumatic cold water replenishing valve 5 and connected with the DCS control system 2.
There is deareator 7 in the export of water ring vacuum pump 1 through the pipe mounting, deareator 7 is installed with the horizontal center line position high position of the 1 pump body of water ring vacuum pump with water ring vacuum pump, guarantees that the water moisturizing of the 1 pump body seal water of water ring vacuum pump can fully discharge, and the overflow mouth is installed and can be guaranteed to have sufficient sealed liquid in the 1 pump body horizontal center line position of water ring vacuum pump, guarantees the formation of water ring, be fixed with open overflow viewer 9 on the overflow pipe 8 for observe separator overflow water volume in the operation, deareator 7 inside is fixed with level sensor 10, level sensor 10 is connected with DCS control system 2, fire-fighting water pond or industrial water pond recycle can be introduced to deareator not cause the waste of water resource to the overflow water of deareator 7.
Further, the pipe diameter of the cold water replenishing pipe is 50mm, and the measuring range of the temperature sensor is between 10 ℃ and 50 ℃.
Further, the pressure sensor measures in the range of 0-1 MPa.
Further, the tube diameter of the overflow tube 8 is 75mm, and the overflow viewer 9 is funnel-shaped.
Furthermore, the cold water source of the water ring vacuum pump 1 can utilize underground water of a water source place of a power plant or cold water at the bottom of a reservoir, and the water temperature is about 12-20 ℃ in 7-8 months in summer, and because the sealed water exchange amount of the water ring vacuum pump 1 is small, even if the power plant without underground water or water at the bottom of the reservoir, such as a power plant using urban reclaimed water as a water source or a power plant using seawater desalination as a water source, the refrigerated water of a central air conditioner can be used as the sealed water cold water replenishing water source of the water ring vacuum pump 1, so that the refrigeration burden of the central air conditioner cannot be greatly increased, and the operation efficiency of the unit can be obviously improved.
The invention also comprises a control method of the effect lifting device of the water-ring vacuum pump, which comprises the following steps:
the method comprises the following steps: before the water ring vacuum pump 1 is started, the original sealing water pneumatic normal water replenishing valve 4 is closed, the pneumatic cold water replenishing valve 5 is opened, the overflow of the gas-water separator 7 is checked to be normal through the overflow observer 9, the ring vacuum pump 1 is started, the manual stop valve 6 is adjusted, the overflow quantity of the gas-water separator 7 is kept at 1.5t/h-2t/h, through the continuous water change, the sealing water temperature in the pump body of the water ring vacuum pump 1 is kept between 20 and 25 ℃, the sealing water temperature is lower than the saturation temperature of the water ring vacuum pump 1 under the inlet pressure by about 10 ℃, and the efficient operation of the water ring vacuum pump 1 is ensured.
Step two: a pressure sensor is arranged in front of the cold water replenishing valve 5, in normal operation, the cold water pressure display value is between 0.3MPa and 0.5MPa, the original sealed water cooler 3 is still put into a standby state, once the cold water pressure is displayed to be reduced to be below 0.1MPa, the DCS control system 2 is used for automatically controlling, the sealed water pneumatic normal water replenishing valve 4 is opened in an interlocking way, and meanwhile, the cold water replenishing valve 5 is closed, so that the water ring vacuum pump 1 is recovered to the original operation mode;
step three: a temperature sensor is arranged behind the cold water replenishing valve 5 and used for monitoring the water temperature of the sealing water of the water ring vacuum pump 1 in operation, when the water temperature is close to the saturation temperature corresponding to the inlet pressure of the water ring vacuum pump 1, the sealing water is close to the vaporization edge, the output of the water ring vacuum pump 1 is about to drop, and whether the efficiency of a cold water source or a heat exchanger is reduced or not is checked in time;
step four: a water level sensor 10 is arranged on a gas-water separator 7 at the outlet of a water ring vacuum pump 1, liquid level data is transmitted to a DCS control system 2 for monitoring, in normal operation, the liquid level of the gas-water separator 7 is 20mm higher than the horizontal center line of the water ring vacuum pump 1, once the liquid level is reduced to be lower than the horizontal center line of the water ring vacuum pump 1, the internal sealing water quantity of the water ring vacuum pump 1 is insufficient, at the moment, the DCS control system 2 automatically controls, the sealing water pneumatic normal water replenishing valve 4 is opened in an interlocking mode, the cold water replenishing valve 5 is closed, the sealing water of the water ring vacuum pump 1 is cut to the original operation mode, and once the liquid level continues to be reduced to the liquid level 1/4 of the pump body of the water ring vacuum pump 1, the water ring.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. The utility model provides a device is imitated to water ring vacuum pump, includes water ring vacuum pump (1) and DCS control system (2), its characterized in that: a cold water replenishing pipe is fixed on a rear pipeline of a sealed water cooler (3) of a water ring vacuum pump (1), a sealed water cold water replenishing water source is introduced by the cold water replenishing pipe, a sealed water pneumatic normal water replenishing valve (4) is fixed on the cold water replenishing pipe, a temperature sensor is installed behind the sealed water pneumatic normal water replenishing valve (4), the temperature sensor is connected with a DCS control system (2), a pneumatic cold water replenishing valve (5) is fixed on the cold water replenishing pipe, a manual stop valve (6) is installed behind the pneumatic cold water replenishing valve (5), a pressure sensor is installed on a front pipeline of the pneumatic cold water replenishing valve (5), and the pressure sensor is connected with the DCS control system (2);
the utility model discloses a water ring vacuum pump, including water ring vacuum pump (1), the export of water ring vacuum pump (1) has gas-water separator (7) through the pipe mounting, overflow pipe (8) are installed with the horizontal center line position high position of the water ring vacuum pump (1) pump body in gas-water separator (7), be fixed with open overflow viewer (9) on overflow pipe (8), gas-water separator (7) inside is fixed with level sensor (10), level sensor (10) are connected with DCS control system (2).
2. The water ring vacuum pump efficiency improving apparatus as claimed in claim 1, wherein: the pipe diameter of the cold water replenishing pipe is 50mm, and the measuring range of the temperature sensor is 10-50 ℃.
3. The water ring vacuum pump efficiency improving apparatus as claimed in claim 1, wherein: the measuring range of the pressure sensor is between 0 and 1 MPa.
4. The water ring vacuum pump efficiency improving apparatus as claimed in claim 1, wherein: the pipe diameter of the overflow pipe (8) is 75mm, and the overflow observer (9) is funnel-shaped.
5. The water ring vacuum pump efficiency improving apparatus as claimed in claim 1, wherein: the cold water source of the water ring vacuum pump (1) can utilize underground water of a water source place of a power plant or cold water at the bottom of a reservoir.
6. A water ring vacuum pump efficiency improving apparatus according to any one of claims 1 to 5, wherein: the method for controlling the effect lifting device of the water-ring vacuum pump comprises the following specific steps:
the method comprises the following steps: before the water ring vacuum pump (1) is started, the original sealed water pneumatic normal water replenishing valve (4) is closed, the pneumatic cold water replenishing valve (5) is opened, the overflow of the gas-water separator (7) is checked to be normal through the overflow observer (9), the ring vacuum pump (1) is started, and the manual stop valve (6) is adjusted to keep the overflow quantity of the gas-water separator (7) at 1.5t/h-2 t/h;
step two: a pressure sensor is arranged in front of the cold water replenishing valve (5), in normal operation, the cold water pressure display value is between 0.3MPa and 0.5MPa, the original sealed water cooler (3) is still put into a standby state, once the cold water pressure is displayed to be reduced to be below 0.1MPa, the DCS control system (2) is used for automatically controlling, the sealed water pneumatic normal replenishing valve (4) is interlocked and opened, the cold water replenishing valve (5) is closed at the same time, and the water ring vacuum pump (1) is enabled to recover the original operation mode;
step three: a temperature sensor is arranged behind the cold water replenishing valve (5) and used for monitoring the water temperature of the sealing water of the water ring vacuum pump (1) in operation, when the water temperature is close to the saturation temperature corresponding to the inlet pressure of the water ring vacuum pump (1), the fact that the sealing water is close to the vaporization edge is shown, the output of the water ring vacuum pump (1) is about to drop, and whether the efficiency of a cold water source or a heat exchanger drops or not is checked in time;
step four: the water level sensor (10) is installed on the gas-water separator (7) at the outlet of the water ring vacuum pump (1), liquid level data are transmitted to the DCS control system (2) for monitoring, in normal operation, the liquid level of the gas-water separator (7) is higher than the position of the horizontal center line of the water ring vacuum pump (1) by 20mm, once the liquid level is reduced to be lower than the horizontal center line of the water ring vacuum pump (1), the internal sealing water quantity of the water ring vacuum pump (1) is insufficient, at the moment, the sealing water pneumatic normal water replenishing valve (4) is opened in an interlocking mode through the DCS control system (2), the cold water replenishing valve (5) is closed, the sealing water of the water ring vacuum pump (1) is cut to the original operation mode, and once the liquid level continues to be reduced to the liquid level of the water ring vacuum pump (1), the water ring vacuum pump body is.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110475193.6A CN113074113A (en) | 2021-04-29 | 2021-04-29 | Efficiency improving device of water-ring vacuum pump and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110475193.6A CN113074113A (en) | 2021-04-29 | 2021-04-29 | Efficiency improving device of water-ring vacuum pump and control method |
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| Publication Number | Publication Date |
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| CN113074113A true CN113074113A (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110475193.6A Pending CN113074113A (en) | 2021-04-29 | 2021-04-29 | Efficiency improving device of water-ring vacuum pump and control method |
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| Country | Link |
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| CN (1) | CN113074113A (en) |
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2021
- 2021-04-29 CN CN202110475193.6A patent/CN113074113A/en active Pending
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