CN112594554B - Valve operation method for solving problem of overlarge positive pressure of high-lift water delivery system - Google Patents
Valve operation method for solving problem of overlarge positive pressure of high-lift water delivery system Download PDFInfo
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- CN112594554B CN112594554B CN202011425923.3A CN202011425923A CN112594554B CN 112594554 B CN112594554 B CN 112594554B CN 202011425923 A CN202011425923 A CN 202011425923A CN 112594554 B CN112594554 B CN 112594554B
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- water
- delivery system
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- hydraulic control
- ball valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a valve operation method for solving the problem of overlarge positive pressure of a high-lift water delivery system, which comprises the following steps that (1) under the condition that the water delivery system normally operates, a hydraulic control ball valve is in a fully-opened state; (2) after the water pump pumps water and is powered off, the hydraulic control ball valve is quickly closed to zero opening; (3) when the maximum pressure at the bottom of the air tank rises to a positive pressure critical value, quickly opening the hydraulic control ball valve to a target small opening degree, and releasing an overlarge positive pressure to the water inlet pool; (4) and (4) keeping the small opening degree of the step (3), and slowly closing the hydraulic control ball valve to a zero opening degree after the excessive positive pressure is released, so as to prevent the water in the water outlet pool from flowing backwards. The invention solves the problem of overlarge positive pressure of a high-lift water delivery system, can effectively protect the safety of the water delivery system without additionally increasing protective measures, and can replace an overpressure relief valve on a pipeline in the actual process to reduce the volume of an air tank, thereby saving the engineering investment.
Description
Technical Field
The invention relates to a valve operation method, in particular to a valve operation method for solving the problem of overlarge positive pressure of a high-lift water delivery system.
Background
The long-distance water supply engineering is the most direct and effective way for solving the problem of water resource shortage at present, but the safety of a water delivery pipeline is a great problem in the water delivery engineering. Water hammer can be generated when the water pump pumps water and is powered off or the valve is suddenly closed, so that the safety of a water delivery system is threatened. Because the air tank installation management is convenient, all have better protective effect to water hammer positive and negative pressure, be prepared favourably in long distance water supply engineering.
Generally, the larger the volume of the air tank, the better the water hammer protection effect, but in actual engineering, the size of the air tank is influenced by factors such as economy and installation. The water delivery engineering of the air tank is arranged behind the water pump, and after the water pump pumps water and is powered off, in order to prevent water in the tank from flowing backwards to the water pump, the volume of the air tank is reduced, and a valve behind the water pump needs to be closed quickly. For a water delivery system with gentle terrain tendency and small water pump lift, when the volume of the air tank meets the bearing standard of the minimum pressure of the pipeline, the maximum pressure of the water delivery system can often meet the bearing standard of the pipeline. Therefore, water delivery system minimum pressure is often the controlling factor for optimizing air tank volume. However, for water delivery projects with large terrain drop, the pump lift of the water pump is generally large, and the air tank body obtained by optimizing the bearing standard of the minimum pressure of the pipeline is often difficult to meet the bearing standard of the maximum pressure. In this case, the overpressure relief valve can be installed at a place where the positive pressure of the system is large to protect the safety of the water pipeline, but when the relief valve is used for pressure reduction, the drainage problem of the relief valve needs to be considered, and the operation management of the water delivery system is not facilitated. In addition, the installation of an overpressure relief valve can additionally increase the engineering investment. The current more common solution in engineering is to increase the volume of the air tank, but it is obviously not an economical way to increase the volume of the air tank additionally just to protect the system from positive pressure.
Therefore, an economical and reliable system pressure reduction scheme is designed, so that the maximum positive pressure of the system meets the pipeline pressure-bearing standard, and the volume of the air tank is not additionally increased, which is a technical problem to be solved.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an operation method of a valve for solving the problem of overlarge positive pressure of a high-lift water delivery system, and effectively protect the safety of the water delivery system.
The technical scheme is as follows: the invention comprises the following steps:
(1) under the condition that the water delivery system normally operates, the hydraulic control ball valve is in a fully-opened state;
(2) after the water pump pumps water and is powered off, the hydraulic control ball valve is quickly closed to zero opening;
(3) when the maximum pressure at the bottom of the air tank rises to a positive pressure critical value, quickly opening the hydraulic control ball valve to a target small opening degree, and releasing an overlarge positive pressure to the water inlet pool;
(4) and (4) keeping the small opening degree of the step (3), and slowly closing the hydraulic control ball valve to a zero opening degree after the excessive positive pressure is released, so as to prevent the water in the water outlet pool from flowing backwards.
And (4) determining the critical value of the maximum pressure at the bottom of the air tank in the step (3) by subtracting a safety value from the maximum pressure standard of the pipeline.
When the water pump is in a pumping power-off accident, the water delivery system is required not to generate negative pressure, and the maximum internal water pressure does not exceed the pipeline pressure-bearing standard.
The water delivery system comprises a water inlet tank and a water outlet tank, and a water pump, a hydraulic control ball valve and an air tank are sequentially arranged between the water inlet tank and the water outlet tank.
The water pump, the hydraulic control ball valve and the air tank are all arranged close to the water inlet pool.
Has the advantages that: the invention solves the problem of overlarge positive pressure of a high-lift water delivery system, can effectively protect the safety of the water delivery system without additionally increasing protective measures, and can replace an overpressure relief valve on a pipeline in the actual process to reduce the volume of an air tank, thereby saving the engineering investment.
Drawings
FIG. 1 is a schematic view of the arrangement of a water delivery system for an air-containing tank of the present invention;
FIG. 2 is a diagram of a relative opening change process of a hydraulic control ball valve under different protection schemes after a water pump is powered off;
FIG. 3 is a diagram of the process of the change of the pressure at the bottom of the air tank under different protection schemes after the power failure of the water pump;
FIG. 4 is a minimum pressure envelope diagram of a water delivery system under different protection schemes after a water pump is powered down;
fig. 5 is a maximum pressure envelope diagram of the water delivery system under different protection schemes after the water pump is powered down.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in figure 1, the water-saving device comprises a water inlet tank 1 and a water outlet tank 6, wherein a water pump 2, a hydraulic control ball valve 3 and an air tank 4 are sequentially arranged on a water conveying pipeline 5 between the water inlet tank 1 and the water outlet tank 6, and the water pump 2, the hydraulic control ball valve 3 and the air tank 4 are all arranged close to the water inlet tank 1. The terrain fall and the pump lift of the water delivery system are large, and the volume of the air tank 4 can not meet the requirement of positive pressure when meeting the requirement of negative pressure of a pipeline. Under the condition that the water delivery system normally operates, the hydraulic control ball valve 3 is in a full open state. When a pumping station suddenly generates a pumping outage accident, the hydraulic control ball valve 3 is quickly closed to zero opening when the water in the air tank 4 flows back to the water inlet pool 1, so that more water in the air tank 4 is supplied to the pipeline, and the negative pressure protection characteristic of the air tank 4 is fully utilized. When the water level in the air tank 4 is in a certain oscillation time and the bottom pressure of the air tank 4 is increased to the maximum pressure critical value, the hydraulic control ball valve 3 is quickly opened to a certain small opening degree, and the overlarge positive pressure is released to the water inlet pool. And keeping the small opening for a period of time, and slowly closing the hydraulic control ball valve 3 to zero opening after the excessive pressure is released, so as to prevent the water in the water outlet pool 6 from flowing backwards.
Because of different water delivery systems, the working characteristics of the water pump 2 and the overflowing characteristics of the hydraulic control ball valve 3 are different, and the characteristic curves of the water pump and the hydraulic control ball valve can be provided by water pump or valve manufacturers. In addition, different water delivery system air tanks 4 and pipeline pressure-bearing standards are different, and the hydraulic control ball valve 3 is determined according to the time for starting backflow of the flow at the water pump 2 from the rule of full opening and closing to zero; when the valve is operated, the pressure response in the pipeline has certain delay time, and the critical value of the maximum pressure at the bottom of the air tank 4 is determined by subtracting a safety value from the maximum pressure standard of the pipeline. When the pressure at the bottom of the gas tank rises to the critical value of the maximum pressure, the opening degree of the hydraulic control ball valve 3 cannot be too large, otherwise, the pressure fluctuation value in the pipeline is large, and the minimum pressure of the local pipeline cannot meet the requirement. The specific opening rule, small opening value, small opening holding time and closing rule from small opening to zero opening of the hydraulic control ball valve 3 are determined by the combination of an overcurrent characteristic curve of the valve and a pressure bearing standard of positive and negative pressure of a pipeline.
The total length of the water transmission line of the embodiment is 10.40km, and the total designed flow is 1.30m3And s. The designed water level of the water inlet pool 1 is 711.00m, the water is pressurized by the water pump 2 and then is delivered to the water outlet pool 6 through the DN1200 water delivery pipeline 5, and the designed water level of the water outlet pool 6 is 876.00 m. The pumping station is provided with four horizontal double-suction centrifugal pumps (3 is used as 1 spare) with designed lift of 167.00 m. When the water pump is used for 2 timesWhen the water pumping is in power failure, the water delivery system is required not to generate negative pressure, and the maximum internal water pressure does not exceed 250.0 m.
In the embodiment, three different protection schemes are designed, and the body type parameters of the air tank of the three schemes are shown in the table 1. When the water pump is powered off, the ball valves of the schemes A and B are closed according to the same closing rule and are closed to zero opening degree after being fully opened for 5 s; the ball valve of the scheme C adopts the closing rule of the invention, namely, the ball valve is closed to zero opening from full opening for 5s when power failure occurs; when the bottom pressure of the air tank reaches a critical value of 200.0m (the pressure bearing standard is 250.0m minus the safety value is 50.0m), the valve is opened from the opening of 5s to the opening of 0.1 s, and after the opening is kept for 30s, the hydraulic control ball valve is closed from the opening of 0.1 s to the opening of zero by adopting a closing rule of 30s one-section linear closing. The specific action rule of the three schemes of hydraulic control ball valves is shown in figure 2.
TABLE 1 air tank body type parameters
TABLE 2 statistics of pressure extremes for different protection schemes
As can be seen from Table 2 and FIGS. 3 to 5, the total volume of the air tank of the embodiment A is 44.22m3The protection requirement of the negative pressure of the water delivery system can be met, but the maximum positive pressure of the water delivery system is 280.61m, which far exceeds the pressure-bearing standard of the pipeline. The total volume of the air tank of the scheme B is 100.80m3The hydraulic control ball valve can simultaneously meet the requirements of positive pressure and negative pressure of a water pipeline, the operation mode of the scheme B is the same as that of the scheme A, but in order to protect the positive pressure of the system, the volume of the air tank is increased by 56.58m3. The total volume of the air tank in the scheme C is the same as that in the scheme A, and the operation modes of the hydraulic control ball valve are different; the protection effect of the scheme C is basically the same as that of the scheme B, namely the scheme C meets the requirements of positive pressure and negative pressure of the water pipeline at the same time, but the volume of the air tank of the scheme C is reduced by 127.95 percent compared with the volume of the scheme B. It can be seen that the method of the present invention can be well solvedThe problem of overlarge positive pressure of a high-lift water delivery system is solved, the total volume of the air tank is effectively reduced, and the engineering investment is saved.
Claims (3)
1. A valve operation method for solving the problem of overlarge positive pressure of a high-lift water delivery system is characterized by comprising the following steps:
(1) under the condition that the water delivery system normally operates, the hydraulic control ball valve is in a fully-opened state, the water delivery system comprises a water inlet pool and a water outlet pool, and a water pump, the hydraulic control ball valve and an air tank are sequentially arranged on a water delivery pipeline between the water inlet pool and the water outlet pool;
(2) after the water pump pumps water and is powered off, the hydraulic control ball valve is quickly closed to zero opening, wherein when the water pump pumps water and is powered off, the water delivery system is required not to generate negative pressure, and the maximum internal water pressure does not exceed the pressure bearing standard of the pipeline;
(3) when the maximum pressure at the bottom of the air tank rises to a positive pressure critical value, quickly opening the hydraulic control ball valve to a target small opening degree, and releasing an overlarge positive pressure to the water inlet pool;
(4) and (4) keeping the small opening degree of the step (3), and slowly closing the hydraulic control ball valve to a zero opening degree after the excessive positive pressure is released, so as to prevent the water in the water outlet pool from flowing backwards.
2. The method for operating the valve to solve the problem of excessive positive pressure of the high-lift water delivery system according to claim 1, wherein the critical value of the maximum pressure at the bottom of the air tank in the step (3) is determined by subtracting a safety value from the maximum pressure standard of the pipeline.
3. The method for operating the valve to solve the problem of excessive positive pressure of the high-lift water delivery system according to claim 1, wherein the water pump, the hydraulic control ball valve and the air tank are all arranged close to the water inlet pool.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011425923.3A CN112594554B (en) | 2020-12-09 | 2020-12-09 | Valve operation method for solving problem of overlarge positive pressure of high-lift water delivery system |
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| CN202011425923.3A CN112594554B (en) | 2020-12-09 | 2020-12-09 | Valve operation method for solving problem of overlarge positive pressure of high-lift water delivery system |
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| CN112594554A CN112594554A (en) | 2021-04-02 |
| CN112594554B true CN112594554B (en) | 2021-11-12 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203499979U (en) * | 2013-07-10 | 2014-03-26 | 贵州省水利水电勘测设计研究院 | Device for reducing water hammer effect of high-lift water pump station |
| CN204781108U (en) * | 2015-06-17 | 2015-11-18 | 上海市水利工程设计研究院有限公司 | Protection pipeline of cooperation water hammer protection air drum energy dissipation |
| CN106842928A (en) * | 2017-02-13 | 2017-06-13 | 中国水利水电科学研究院 | The valve closing optimal control method of long range big flow water-carriage system transient process |
| CN107850270A (en) * | 2015-08-24 | 2018-03-27 | 流动科技株式会社 | With using jet pump effect water attack mitigation capability water piping system and be its pressurized tank connector |
| CN208415367U (en) * | 2018-05-07 | 2019-01-22 | 西安理工大学 | A kind of more valve protecting water hammer devices |
| CN209099432U (en) * | 2018-10-09 | 2019-07-12 | 云南大红山管道有限公司 | A kind of device with unlatching pump discharge operating valve function |
| CN110043744A (en) * | 2019-04-24 | 2019-07-23 | 河海大学 | A method of determining high lift water-carriage system termination of pumping accident pump late gate Closing Law |
| TWM595184U (en) * | 2020-02-27 | 2020-05-11 | 呂永煌 | Water hammer eliminating device for high-rise water pipe |
-
2020
- 2020-12-09 CN CN202011425923.3A patent/CN112594554B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203499979U (en) * | 2013-07-10 | 2014-03-26 | 贵州省水利水电勘测设计研究院 | Device for reducing water hammer effect of high-lift water pump station |
| CN204781108U (en) * | 2015-06-17 | 2015-11-18 | 上海市水利工程设计研究院有限公司 | Protection pipeline of cooperation water hammer protection air drum energy dissipation |
| CN107850270A (en) * | 2015-08-24 | 2018-03-27 | 流动科技株式会社 | With using jet pump effect water attack mitigation capability water piping system and be its pressurized tank connector |
| CN106842928A (en) * | 2017-02-13 | 2017-06-13 | 中国水利水电科学研究院 | The valve closing optimal control method of long range big flow water-carriage system transient process |
| CN208415367U (en) * | 2018-05-07 | 2019-01-22 | 西安理工大学 | A kind of more valve protecting water hammer devices |
| CN209099432U (en) * | 2018-10-09 | 2019-07-12 | 云南大红山管道有限公司 | A kind of device with unlatching pump discharge operating valve function |
| CN110043744A (en) * | 2019-04-24 | 2019-07-23 | 河海大学 | A method of determining high lift water-carriage system termination of pumping accident pump late gate Closing Law |
| TWM595184U (en) * | 2020-02-27 | 2020-05-11 | 呂永煌 | Water hammer eliminating device for high-rise water pipe |
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