CN107560451B - Energy-saving vacuum device - Google Patents
Energy-saving vacuum device Download PDFInfo
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- CN107560451B CN107560451B CN201710967138.2A CN201710967138A CN107560451B CN 107560451 B CN107560451 B CN 107560451B CN 201710967138 A CN201710967138 A CN 201710967138A CN 107560451 B CN107560451 B CN 107560451B
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Abstract
The invention relates to an energy-saving vacuum device which comprises a condenser, a condenser heating well, a condenser main pipe, a first water ring vacuum pump system, a condenser branch pipe, a condenser pipe check valve, a condenser pipe flowmeter, a condenser pipe pressure transmitter, a condenser pipe thermal resistor, a condenser pipe isolation valve, a condenser pipe pneumatic valve, a power steam regulating valve, a steam injector, a pipe heat exchanger, a steam trap, a drain pneumatic valve, a communication isolation valve and a second water ring vacuum pump, wherein the condenser is connected with the condenser heating well; according to the invention, the tubular heat exchanger and the low-power second water ring vacuum pump are adopted to replace the first water ring vacuum pump system, so that the condenser vacuum can be maintained and provided, the condenser is ensured to be in an optimal working condition, the condenser is not influenced by environmental temperature change, the stable suction capacity is always kept, the condenser vacuum is improved, the power generation coal consumption of a unit is reduced, the operation power consumption of a vacuumizing system is reduced, the operation of system equipment is reliable and safe, the maintenance workload is low, no cavitation phenomenon is generated, and no high noise and vibration phenomenon are caused.
Description
Technical Field
The invention relates to the technical field of vacuumizing, in particular to an energy-saving vacuum device and a control method thereof.
Background
The condenser is one of important equipment of the thermal generator set, and the vacuum value of the condenser has important influence on the economical efficiency of the operation of the steam turbine generator set. There are many factors affecting the condenser vacuum, among which the most direct are vacuum tightness, cooling water temperature, cooling water quantity, operating characteristics of the water ring vacuum pump, etc. At present, a condenser vacuumizing system of a domestic 300MW and above grade generator set is mainly provided with 2 or 3 water ring vacuum pump sets, and the water ring vacuum pump has the following defects:
1. the temperature of the working fluid of the water ring vacuum pump is greatly affected by the temperature of cooling water, and the ambient temperature is an important factor affecting the temperature of the cooling water, especially in summer, the temperature of the cooling water reaches thirty degrees, and the temperature of the working fluid can even reach more than forty degrees due to the end difference of the heat exchanger. Under the vacuum condition, the working solution of the water ring vacuum pump is largely vaporized to generate cavitation, so that the problems of vibration, noise and the like are further caused, the pumping characteristic of the water ring vacuum pump is greatly reduced, the dry air in the condenser cannot be timely pumped away, the vacuum of the condenser is further influenced, and the safe and stable operation and the economical efficiency of the operation of a unit are seriously influenced;
2. in the traditional unit vacuumizing system, a water ring vacuum pump is configured according to the requirement of vacuum establishment of a unit, so that the running electricity consumption of equipment is high, and a large consumption reduction space is provided under the running condition of maintaining the vacuum of the unit;
3. because part of uncondensed gas and water are still in the steam-gas mixture in the condensing pipeline of the unit, if the part of uncondensed gas and water are removed, the water ring vacuum pump is hopefully selected to be reduced;
4. the water ring vacuum pump is a rotating device, impeller abrasion and cavitation are generated, and the daily maintenance workload is very large.
Based on this, an energy-saving vacuum device for adjusting and controlling according to the actual working condition of the condenser is required to be designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and obtain an energy-saving vacuum device.
The invention is realized by the following technical scheme:
an energy-saving vacuum device comprises a condenser, a condenser heating well, a condenser main pipe, a first water ring vacuum pump system, a condenser branch pipe, a condenser pipe check valve, a condenser pipe flowmeter, a condenser pipe pressure transmitter, a condenser pipe thermal resistor, a condenser pipe isolation valve, a condenser pipe pneumatic valve, a power steam regulating valve, a steam injector, a pipe heat exchanger, a steam trap, a drainage pneumatic valve, a communication isolation valve and a second water ring vacuum pump;
the condenser is characterized in that a condenser heating well is arranged below the condenser, an outlet of the condenser is connected with a condensing main pipe, the other end of the condensing main pipe is connected to an inlet of a first water ring vacuum pump system, an outlet of the first water ring vacuum pump system is connected to the atmosphere, a condensing branch pipe is connected to the condensing main pipe, a condensing pipe check valve, a condensing pipe flowmeter, a condensing pipe pressure transmitter, a condensing pipe thermal resistor, a condensing pipe isolation valve and a condensing pipe pneumatic valve are sequentially arranged on the condensing branch pipe, the other end of the condensing branch pipe is connected to a suction inlet of the steam injector, a power steam regulating valve is arranged on an inlet of the steam injector, an adjustable nozzle is arranged on the steam injector, an outlet of the steam injector is connected to an inlet of a tubular heat exchanger, a cooling water supply pipe and a cooling water return pipe are also connected to an inlet of a second water ring vacuum pump, an outlet of the second water ring vacuum pump is connected to the atmosphere, and the second water ring vacuum pump is connected to the first water ring vacuum pump through an isolation valve and a first water ring vacuum pump.
The invention further improves that the power steam regulating valve carries out variable speed regulation of pressure according to the difference value between the measured data of the condensing pipeline pressure transmitter and the design pressure.
The invention further improves that when the measured data of the pressure transmitter of the condensing pipeline is smaller than 0.3Mpa, the first water ring vacuum pump system operates, and the second water ring vacuum pump exits.
The invention further improves that when the outlet temperature of the tubular heat exchanger is greater than the temperature set value, the first water ring vacuum pump system operates, and the second water ring vacuum pump exits.
The invention further improves that when the outlet pressure of the tubular heat exchanger is larger than the pressure set value, the first water ring vacuum pump system operates, and the second water ring vacuum pump exits.
The invention is further improved in that a steam trap is arranged below the tubular heat exchanger, and the steam trap is connected to a condenser hot well through a steam trap pneumatic valve.
The invention is further improved in that the signal collected in the device is accessed into a DCS control system, and the DCS control system is used for adjusting and controlling.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the total power steam and the injection coefficient of the steam injector are calculated according to factors such as the load, the vacuum tightness, the cooling water temperature, the cooling water quantity and the like of the unit, and the adjustable nozzle of the steam injector is adjusted to the required opening degree, so that the requirement of maintaining and improving the vacuum of the unit is met, and the unit is ensured to obtain the maximum energy-saving effect;
2. the invention adopts the principle of the steam ejector to suck the steam-gas mixture in the condenser, so as to ensure that the condenser is always in a high vacuum state;
3. according to the invention, the steam ejector is used for improving the inlet pressure of the water ring vacuum pump, so that the temperature difference between the vaporization temperature of the working solution of the water ring vacuum pump and the actual temperature of the working solution reaches more than 10 ℃, and the cavitation phenomenon of the water ring vacuum pump is avoided;
4. according to the automatic power steam regulating system formed by the power steam regulating valve and the condensing pipeline pressure transmitter, the speed change regulation is carried out according to the difference value between the data measured by the condensing pipeline pressure transmitter and the pressure set value, and the pressure fluctuation of the power steam is restrained;
5. according to the invention, the tubular heat exchanger and the low-power second water ring vacuum pump are adopted to replace the first water ring vacuum pump system, so that the condenser vacuum can be maintained and provided, the condenser is ensured to be in an optimal working condition, the condenser is not influenced by environmental temperature change, the stable suction capacity is always kept, the condenser vacuum is improved, the power generation coal consumption of a unit is reduced, the operation power consumption of a vacuumizing system is reduced, the operation of system equipment is reliable and safe, the maintenance workload is low, no cavitation phenomenon is generated, and no high noise and vibration phenomenon are caused.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, an energy-saving vacuum device comprises a condenser 1, a condenser heat well 15, a condenser main pipe 2, a first water ring vacuum pump system 17, a condenser branch pipe 18, a condenser pipe check valve 11, a condenser pipe flowmeter 10, a condenser pipe pressure transmitter 9, a condenser pipe thermal resistor 8, a condenser pipe isolation valve 7, a condenser pipe pneumatic valve 6, a power steam regulating valve 3, a steam injector 4, a pipe heat exchanger 5, a steam trap 12, a steam trap pneumatic valve 21, a communication pneumatic valve 13, a communication isolation valve 14 and a second water ring vacuum pump 16;
wherein a condenser heating well 15 is arranged below the condenser 1, an outlet of the condenser 1 is connected with a condenser main pipe 2, the other end of the condenser main pipe 2 is connected with an inlet of a first water ring vacuum pump system 17, an outlet of the first water ring vacuum pump system 17 is connected to the atmosphere, a condensing branch pipe 18 is connected to the condenser main pipe 2, a condensing pipeline check valve 11, a condensing pipeline flowmeter 10, a condensing pipeline pressure transmitter 9, a condensing pipeline thermal resistor 8, a condensing pipeline isolation valve 7 and a condensing pipeline pneumatic valve 6 are sequentially arranged on the condensing branch pipe 18, the condensing pipeline check valve 11 is configured to prevent the phenomenon of vacuum leakage of an energy-saving vacuum device, the reliability and the safety of equipment are improved, the other end of the condensing branch pipe 18 is connected to a suction inlet of a steam injector 4, a power steam regulating valve 3 is arranged on the inlet of the steam injector 4, the steam ejector 4 is provided with an adjustable nozzle, the outlet of the steam ejector 4 is connected with the inlet of the tubular heat exchanger 5, the tubular heat exchanger 5 is also connected with a cooling water supply pipe 19 and a cooling water return pipe 20, the total power steam and the injection coefficient of the steam ejector 4 are calculated according to factors such as the load, the vacuum tightness, the cooling water temperature, the cooling water quantity and the like of the unit, the power nozzle of the steam ejector 4 is adjusted to the required opening degree, the requirement of maintaining and improving the vacuum of the unit is met, the unit can be ensured to obtain the maximum energy-saving effect, the outlet of the tubular heat exchanger 5 is connected with the inlet of the second water ring vacuum pump 16, the tubular heat exchanger 5 is responsible for condensing the power steam of the steam ejector 4 and the uncondensed gas in the condenser 1 into water, the inlet pressure of the second water ring vacuum pump 16 is improved, the temperature difference between the vaporization temperature of the corresponding working fluid and the actual temperature of the working fluid reaches more than 10 ℃, so that cavitation phenomenon can not be generated in the second water ring vacuum pump 16, the outlet of the second water ring vacuum pump 16 is connected to the atmosphere, the second water ring vacuum pump 16 is connected with the first water ring vacuum pump system 17 through the connecting isolation valve 14 and the connecting pneumatic valve 13, when the second water ring vacuum pump 16 fails, the steam injector 4 can operate with the first water ring vacuum pump system 17, the vacuum of a unit is maintained and improved, and the power of the second water ring vacuum pump 16 is smaller than that of the first water ring vacuum pump system 17.
In specific implementation, the power steam regulating valve 3 performs variable speed regulation of pressure according to the difference between the measured data of the condensing pipeline pressure transmitter 9 and the design pressure, and the steam injector 4 of the energy-saving vacuum device needs to provide power steam with stable pressure during operation, so that the pressure is automatically controlled according to the design pressure setting pressure of the power steam in the control system, and the opening degree of the power steam regulating valve 3 is regulated according to the difference between the measured power steam pressure of the condensing pipeline pressure transmitter 9 and the design pressure. Meanwhile, in order to prevent large pressure fluctuation in the whole control process, different adjusting speeds are implemented according to the difference value, and the pressure fluctuation of the power steam is effectively restrained.
In specific implementation, when the measured data of the condensing pipeline pressure transmitter 9 is smaller than 0.3Mpa, the first water-ring vacuum pump system 17 operates, and the second water-ring vacuum pump 16 exits.
In practice, when the outlet temperature of the tubular heat exchanger 5 is greater than the temperature set point, the first water ring vacuum pump system is operated 17 and the second water ring vacuum pump 16 is withdrawn.
In practice, when the outlet pressure of the tubular heat exchanger 5 is greater than the pressure set point, the first water ring vacuum pump system 17 is operated and the second water ring vacuum pump 16 is withdrawn.
In specific implementation, the steam trap 12 is arranged below the tubular heat exchanger 5, and the steam trap 12 is connected to the condenser hot well 15 through the steam trap pneumatic valve 21, so that the pressure of the steam trap is ensured to be greater than the pressure of the opening position of the condenser hot well 15, and the steam trap of the tubular heat exchanger 5 can be smoothly discharged into the condenser hot well 15.
In specific implementation, signals collected in the device are accessed into a DCS control system, and the DCS control system is used for adjusting and controlling.
The operation condition of the invention during operation is as follows:
when the unit is started, a first water ring vacuum pump system 17 is adopted for starting; after the unit normally operates, the second water ring vacuum pump 16 is put into operation, and the first water ring vacuum pump system 17 is withdrawn from operation; if the second water ring vacuum pump 16 fails, or an operator issues an exit request, the first water ring vacuum pump system 17 is put into operation, and the second water ring vacuum pump 16 exits; if the second water ring vacuum pump 16 fails, or the operator needs to re-input, the second water ring vacuum pump 16 is input and the first water ring vacuum pump system 17 is withdrawn.
Besides the second water ring vacuum pump 16 and the first water ring vacuum system 17, the invention has no rotating parts, no mechanical abrasion and no power consumption equipment, ensures that the suction characteristic of the energy-saving vacuum device is not influenced by the ambient temperature, can selectively provide different forces according to factors such as the load of a unit, the vacuum tightness, the cooling water temperature, the cooling water quantity and the like, and has the advantages that the application of the tubular heat exchanger 5 and the inlet pressure of the water ring vacuum pump are improved, the volume flow of the gas-gas mixture at the inlet of the second water ring vacuum pump 16 is reduced, and the equipment power consumption is reduced by 70% -90%.
In summary, the invention solves the equipment problems existing in the prior art of the generator set, and achieves the aims of saving energy and reducing consumption of the generator set to the greatest extent.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. The energy-saving vacuum device comprises a condenser, a condenser heating well, a condensing main pipe, a first water ring vacuum pump system, and is characterized by further comprising a condensing branch pipe, a condensing pipeline check valve, a condensing pipeline flowmeter, a condensing pipeline pressure transmitter, a condensing pipeline thermal resistor, a condensing pipeline isolation valve, a condensing pipeline pneumatic valve, a power steam regulating valve, a steam ejector, a tubular heat exchanger, a steam trap, a drain pneumatic valve, a communication isolation valve and a second water ring vacuum pump;
the condenser is characterized in that a condenser heating well is arranged below the condenser, an outlet of the condenser is connected with a condenser main pipe, the other end of the condenser main pipe is connected to an inlet of a first water ring vacuum pump system, an outlet of the first water ring vacuum pump system is connected to the atmosphere, a condenser branch pipe is connected to the condenser main pipe, a condenser pipe check valve, a condenser pipe flowmeter, a condenser pipe pressure transmitter, a condenser pipe thermal resistor, a condenser pipe isolation valve and a condenser pipe pneumatic valve are sequentially arranged on the condenser branch pipe, the other end of the condenser branch pipe is connected to a suction inlet of a steam ejector, a power steam regulating valve is arranged on an inlet of the steam ejector, an adjustable nozzle is arranged on the steam ejector, an outlet of the steam ejector is connected to an inlet of a tubular heat exchanger, a cooling water supply pipe and a cooling water return pipe are also connected to an inlet of a second water ring vacuum pump, an outlet of the second water ring vacuum pump is connected to the atmosphere, and the second water ring vacuum pump is connected to the first water ring vacuum pump through the isolation valve and the first water ring vacuum pump; when the outlet temperature of the tubular heat exchanger is greater than a temperature set value, the first water ring vacuum pump system operates, and the second water ring vacuum pump exits; and the power steam regulating valve carries out variable speed regulation on the pressure according to the difference value between the measured data of the condensing pipeline pressure transmitter and the design pressure.
2. An energy efficient vacuum apparatus as defined in claim 1, wherein: when the measured data of the condensing pipeline pressure transmitter is smaller than 0.3Mpa, the first water ring vacuum pump system operates, and the second water ring vacuum pump exits.
3. An energy efficient vacuum apparatus as defined in claim 1, wherein: when the outlet pressure of the tubular heat exchanger is larger than the pressure set value, the first water ring vacuum pump system operates, and the second water ring vacuum pump exits.
4. An energy efficient vacuum apparatus as defined in claim 1, wherein: and a steam trap is further arranged below the tubular heat exchanger and is connected to a condenser hot well through a steam trap pneumatic valve.
5. An energy efficient vacuum apparatus as defined in claim 1, wherein: the signals collected in the device are connected into a DCS control system, and the DCS control system is used for adjusting and controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710967138.2A CN107560451B (en) | 2017-10-17 | 2017-10-17 | Energy-saving vacuum device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710967138.2A CN107560451B (en) | 2017-10-17 | 2017-10-17 | Energy-saving vacuum device |
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| CN107560451A CN107560451A (en) | 2018-01-09 |
| CN107560451B true CN107560451B (en) | 2023-09-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109443030A (en) * | 2018-10-31 | 2019-03-08 | 武汉艾德沃泵阀有限公司 | A kind of vacuum plant suitable for air cooling unit |
| CN112344757A (en) * | 2020-11-28 | 2021-02-09 | 桂林市深能环保有限公司 | Power plant condenser evacuation prevent ponding device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110877A (en) * | 1984-11-02 | 1986-05-29 | Hitachi Ltd | Vacuum pump for condenser |
| CN103940256A (en) * | 2014-04-11 | 2014-07-23 | 张曙光 | Power plant condenser steam jet and vacuumizing system with pressure control function |
| CN203772051U (en) * | 2014-04-11 | 2014-08-13 | 张曙光 | Multistage steam ejector vacuum-pumping system of double backpressure condensers |
| CN204064016U (en) * | 2014-09-04 | 2014-12-31 | 程晋瑞 | A kind of condenser steam injection vacuum system energy-saving for new power plant construction |
| CN205825746U (en) * | 2016-05-31 | 2016-12-21 | 廖倩 | A kind of plant condenser pumped vacuum systems |
| CN206387279U (en) * | 2017-01-05 | 2017-08-08 | 陆明 | The changeable vapor injection vacuum pumping system of three-level of low steam consumption |
-
2017
- 2017-10-17 CN CN201710967138.2A patent/CN107560451B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110877A (en) * | 1984-11-02 | 1986-05-29 | Hitachi Ltd | Vacuum pump for condenser |
| CN103940256A (en) * | 2014-04-11 | 2014-07-23 | 张曙光 | Power plant condenser steam jet and vacuumizing system with pressure control function |
| CN203772051U (en) * | 2014-04-11 | 2014-08-13 | 张曙光 | Multistage steam ejector vacuum-pumping system of double backpressure condensers |
| CN204064016U (en) * | 2014-09-04 | 2014-12-31 | 程晋瑞 | A kind of condenser steam injection vacuum system energy-saving for new power plant construction |
| CN205825746U (en) * | 2016-05-31 | 2016-12-21 | 廖倩 | A kind of plant condenser pumped vacuum systems |
| CN206387279U (en) * | 2017-01-05 | 2017-08-08 | 陆明 | The changeable vapor injection vacuum pumping system of three-level of low steam consumption |
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