CN109653302B - Method for determining height of voltage stabilizing tower in step pump station system and determining system operation mode - Google Patents

Method for determining height of voltage stabilizing tower in step pump station system and determining system operation mode Download PDF

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CN109653302B
CN109653302B CN201811516640.2A CN201811516640A CN109653302B CN 109653302 B CN109653302 B CN 109653302B CN 201811516640 A CN201811516640 A CN 201811516640A CN 109653302 B CN109653302 B CN 109653302B
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water
pump station
head
pressure stabilizing
stabilizing tower
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CN109653302A (en
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周天驰
李高会
陈益民
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PowerChina Huadong Engineering Corp Ltd
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PowerChina Huadong Engineering Corp Ltd
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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B11/00—Arrangements or adaptations of tanks for water supply
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B5/00—Use of pumping plants or installations; Layouts thereof
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
    • E03B7/072—Arrangement of flowmeters
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
    • E03B7/075—Arrangement of devices for control of pressure or flow rate
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
    • E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other

Abstract

The invention provides a method for determining the height of a voltage stabilizing tower and a system operation mode in a step pump station system, and aims to solve the problems that in the prior art, a unified method for selecting the height of the voltage stabilizing tower is unavailable, the operation modes of the voltage stabilizing tower and a pump station are determined complicatedly, and the like. The method comprises the following steps: determining gravity free flow regime part HGravity flow of pressure stabilizing towerIn the water head at the pressure stabilizing tower corresponding to the maximum flow
Figure DDA0001902137570000011
Pressurizing condition part H of downstream pump stationPressure stabilizing tower-pump station pressurizationHighest head of water in
Figure DDA0001902137570000012
Determining the elevation Z of a stabilizerPressure stabilizing towerThe lowest value is
Figure DDA0001902137570000013
Figure DDA0001902137570000014
The technical scheme of the invention avoids the problems that the water pump needs to be started and the pressure stabilizing tower also overflows in the system, also avoids the waste caused by overhigh pressure stabilizing tower and has higher reliability and practicability.

Description

Method for determining height of voltage stabilizing tower in step pump station system and determining system operation mode
Technical Field
The invention relates to the field of water supply control systems, in particular to a method for determining the height of a pressure stabilizing tower in a step pump station system and determining the operation mode of the system, which is suitable for long-distance pressure water supply engineering.
Background
In order to relieve the serious and uneven regional distribution of water resources in China, a large batch of large-scale water supply projects are already built or are under construction. In the long-distance water supply project, a large part of water is conveyed by adopting a pressure pipeline mode, and because the pipeline of the long-distance pressure water supply project is long, various protection measures are often required to be arranged to prevent water hammer accidents, so that the safe and stable operation of the system is ensured.
The pressure stabilizing tower is a common water hammer protection measure, and in order to be distinguished from a one-way tower, also called a two-way tower, the free water surface of the pressure stabilizing tower can effectively reflect water hammer waves generated by stopping or starting a pump. In addition, a large amount of water stored in the tower can be timely supplemented into the pipeline to relieve negative pressure, so that the arrangement of the pressure stabilizing tower is also beneficial to the stable operation of the whole water delivery system. At present, a plurality of projects adopt a pressure stabilizing tower as a water hammer protection measure.
In practical engineering, in order to prevent the surge tower from overflowing, a flow regulating valve is often arranged in a pipeline in front of the surge tower to reduce a water head and reduce the water level of the surge tower. If the height of the pressure stabilizing tower is too low, when the highest water level of a water intake port reaches the minimum flow of a system, the water delivery system can automatically flow by gravity, a water pump does not need to be started, overflow of the pressure stabilizing tower can occur, a water head behind the tower cannot meet the downstream automatic flow requirement, when the lowest water level of the water intake port reaches the maximum flow of the system, the water delivery system needs to supply water by means of pressurization of the water pump, the situation that the pump needs to be started and the flow needs to be regulated can occur, and a large amount of electric energy is wasted. If the height of the pressure stabilizing tower is too high, the engineering investment is obviously increased, and the design is difficult due to the too high height of the pressure stabilizing tower. And the operation modes of the pressure regulating tower bottom flow regulating valve and the water pump are closely related to the height of the pressure regulating tower, so that the selection of the proper pressure regulating chamber height is particularly important. However, the current research is relatively focused on the problems of effectiveness of the pressure stabilizing tower as a water hammer protection measure, comparison of the protection measures and the like, and related guidance is lacked for the important problems of the pressure stabilizing tower elevation setting principle and the pressure stabilizing tower and pump station operation strategy.
Disclosure of Invention
The invention provides a method for determining the height of a pressure stabilizing tower and a system operation mode in a step pump station system, aiming at overcoming the problems that the height selection of the pressure stabilizing tower in the prior art is not uniform, the operation mode of the pressure stabilizing tower and a pump station is determined to be complex and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the embodiment of the invention discloses a method for determining the height of a voltage stabilizing tower in a step pump station system, which comprises the following steps:
according to the water head H in front of the upstream pump station of the pressure stabilizing towerBefore 1 #)And the water head H required after the upstream pumping station1# post-demandDetermining the actual water head H behind the upstream pump station in the combined working condition of each flow and the water level of the upstream water intakePost-actual 1#；
According to the actual water head H behind the upstream pump stationPost-actual 1#Determining the head H of the stabilizer in the combined working condition of each flow and the water level of the upstream water intakePressure stabilizing tower；
According to whether a downstream pump station needs to be pressurized to meet the water receiving level of a secondary water plant or not, a water head H at the pressure stabilizing tower is connected with a water inlet of a water supply systemPressure stabilizing towerData partitioning into gravity-fed regime parts HGravity flow of pressure stabilizing towerAnd the pressurization condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurization(ii) a The gravity-flow working condition part HGravity flow of pressure stabilizing towerThe water head at the pressure stabilizing tower under the working condition of the water receiving level of the secondary water plant can be met without opening a downstream pump station by gravity flow, and the pressurizing working condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurizationThe water head at the pressure stabilizing tower under the working condition that the water receiving level of a secondary water plant can be met only by starting pressurization for a downstream pump station, wherein the secondary water plant is a water plant with the pressure stabilizing tower connected through the downstream pump station;
gravity flow operating mode part HGravity flow of pressure stabilizing towerIn the water head H at the pressure stabilizing tower corresponding to the maximum flowQMAX pressure stabilizing tower gravity flowPressure operating condition part H of downstream pumping stationPressure stabilizing tower-pump station pressurizationHighest head of water H inMAX surge tower-pump station pressurizationDetermining the elevation Z of the stabilizerPressure stabilizing towerThe lowest value is MAX (H)MAX pressure stabilizing tower gravity flow-hf1# pump-pressure stabilizing tower，HMAX surge tower-pump station pressurization)+HSafety super highSaid H isSafety super highThe safety margin of the elevation of the pressure stabilizing tower is preset.
Preferably, the water head H in front of the upstream pump station of the stabilizing towerBefore 1 #)And the water head H required after the upstream pumping station1# post-demandDetermining the actual head H after the upstream pumping stationPost-actual 1#Further comprising the steps of:
according to water level elevation H of water intakeIntakePipeline head loss h between water intake and upstream pump stationf intake-1 #The difference determines the head H in front of the upstream pumping stationBefore 1 #)Said H isBefore 1 #)＝HIntake-hf intake-1 #；
Head loss h according to key pipeline between upstream pump station and primary water plantf1# KeyAdding the water receiving level H of the primary water plantReceiving water of No. 1 water plantThe sum determines the water head H needed after the upstream pumping station1# post-demand，HPost-1-request＝hf1# Key+HReceiving water of No. 1 water plantThe first-level water plant is a water plant with an upstream pump station connected with water supply through a pressure stabilizing tower;
according to the water head H in front of the upstream pump stationBefore 1 #)And the water head H required after the upstream pumping station1# post-demandDetermining the actual head H after the upstream pumping stationPost-actual 1#＝MAX(HBefore 1 #)，HPost-1-request)。
Preferably, the actual water head H after the upstream pumping station is used as the basisPost-actual 1#Determining the head H of the stabilizer in the combined working condition of each flow and the water level of the upstream water intakePressure stabilizing towerFurther comprising the steps of:
the actual water head H behind the upstream pump stationPost-actual 1#Subtracting the head loss h between the pressure stabilizing towers of the upstream pump stationf1# pump-pressure stabilizing towerHead H at the stabilizerPressure stabilizing tower＝HPost-actual 1#-hf1# pump-pressure stabilizing tower。
Preferably, the pipeline head loss h between the intake and the upstream pump stationf intake-1 #＝(n2LQ2)/(A2R4 /3) Wherein n is the roughness of the pipeline, L is the length of the pipeline, Q is the flow of the pipeline, A is the area of the pipeline, and R is the wet circumference of the pipeline.
Preferably, the head loss h of the key pipeline between the upstream pumping station and the primary water plantf1# Key＝(n2LQ2)/(A2R4/3) Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, R is the pipeline wet circumference, in the water supply engineering who contains a plurality of one-level water plants, the key pipeline is the head loss H between intake to a certain one-level water plantf water intake-1 # water plantPlus the water receiving level H of the water worksReceiving water of No. 1 water plantThe line with the largest sum.
Preferably, the water head H at the pressure stabilizing tower is used according to whether the downstream pumping station needs to be pressurized to meet the water receiving level of the secondary water plantPressure stabilizing towerData partitioning into gravity-fed regime parts HGravity flow of pressure stabilizing towerAnd the pressurization condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurizationFurther comprising the steps of:
acquiring H of the lift of a downstream pump station required by the water receiving level of a secondary water plant in the combined working condition of each flow and the water level of an upstream water intake2# -head；
If H of the lift of the downstream pump station in a working condition2# -headEqual to or less than zero, the water head H at the pressure stabilizing tower corresponding to the working conditionPressure stabilizing towerDivided into gravity-fed working conditionsGravity flow of pressure stabilizing tower；
If H of the lift of the downstream pump station in a working condition2# -headIf the water head is larger than zero, the water head H at the pressure stabilizing tower corresponding to the working conditionPressure stabilizing towerDivided into downstream pumping station pressurised condition sections HPressure stabilizing tower-pump station pressurization。
Preferably, the H meeting the downstream pump station lift required by the water receiving level of the secondary water plant2# -headFurther comprising:
according to the actual water head H behind the upstream pump stationPost-actual 1#And head loss h between upstream and downstream pumping stationsf1# Pump-2 Pump #Determining head H in front of downstream pumping station2# frontA head H in front of the downstream pumping station2# front＝HPost-actual 1#–hf1# Pump-2 Pump #；
Head loss h according to key pipeline between downstream pump station and secondary water plantf2# KeyPlus the water receiving level H of the secondary water plant2# Water worksReceiving waterThe sum determines the water head H needed after the downstream pumping station2# post-demand，H2# post-demand＝hf2# Key+HReceiving water of 2# waterworksThe secondary water plant is a water plant with a downstream pump station connected with water supply;
the combined working condition of each flow and the water level of the upstream water intake opening meets the requirement of the downstream pump station required by the water receiving level of the secondary water plant2# post-demandAnd head H in front of downstream pumping station2# frontDetermining the lift H of the down-flow pump station required by satisfying the water receiving level of the secondary water plant in the combined working condition of each flow and the water level of the upstream water intake2# -headThe lift H of the lower flow pump station2# -head＝H2# post-demand–H2# front。
Preferably, the head loss h between the upstream and downstream pumping stationsf1# Pump-2 Pump #＝(n2LQ2)/(A2R4/3) Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, R is the pipeline wet circumference, the head loss h of the key pipeline between the downstream pump station and the second-level water plantf2# Key＝(n2LQ2)/(A2R4/3) Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, R is the pipeline wet circumference, in the water supply engineering who contains a plurality of second grade water plants, the key pipeline is the head loss h between the downstream pumping station to certain second grade water plantf2# Pump-2 # Water worksPlus the water receiving level H of the second-level water plantReceiving water of 2# waterworksThe line with the largest sum.
The embodiment of the invention also discloses a method for determining the operation mode of a voltage stabilizing tower system in a step pump station system, which is characterized by comprising the following steps of:
head H at the stabilizerPressure stabilizing towerHeight Z of pressure stabilizing towerPressure stabilizing towerAnd a preset safety margin H for the elevation of the voltage stabilizing towerSafety super highObtaining the flow regulating loss h of the flow regulating valve in front of the pressure stabilizing towerf flow regulating valveSaid current regulation loss hf flow regulating valve＝HPressure stabilizing tower–ZPressure stabilizing tower+HSafety super high；
If the flow regulation loss hf flow regulating valveIs positive and has an absolute value greater than the safety margin H of the high range of the voltage stabilizing towerSafety super highIf the system is operated in the mode of closing the upstream pump station and the downstream pump station and opening the flow regulating valve to regulate the flow until the flow regulating loss hf flow regulating valve；
If the flow regulation loss hf flow regulating valveIs negative and has an absolute value larger than the safety margin H of the high range of the voltage stabilizing towerSafety super highIf so, starting an upstream pump station and a downstream pump station, and fully opening a flow regulating valve;
if the flow regulation loss hf flow regulating valveThe absolute value is less than or equal to the height safety margin H of the voltage stabilizing towerSafety super high(ii) a The upstream and downstream pumping stations are closed and the flow regulating valve is fully opened.
Preferably, the flow regulation loss hf flow regulating valveIs negative and has an absolute value larger than the safety margin H of the high range of the voltage stabilizing towerSafety super highAnd then opening the upstream pump station and the downstream pump station, and fully opening the flow regulating valve, further comprising:
if the flow regulating loss hf flow regulating valve is negative and the absolute value is greater than the high safety margin H of the pressure stabilizing tower, the lift H of the upstream pump station is increased1# -liftAdjusted to H1# -lift＝HPost-1-request–HBefore 1 #)(ii) a Lift H of downstream pumping station2# -headAdjusted to H2# -head＝H2# post-demand–H2# front。
The method for selecting the height of the voltage stabilizing tower and determining the system operation mode effectively solves the problem that the height of the voltage stabilizing tower is difficult to determine in a water supply system of a step pump station. Through selecting suitable steady voltage tower elevation, avoided appearing in the system both need open the water pump, steady voltage tower department also can overflow the emergence of this problem, also avoided the too high waste that causes of steady voltage tower simultaneously, can practice thrift the engineering investment by a wide margin, have higher reliability and practicality.
Drawings
Fig. 1 is a first flowchart of a method for determining a height of a surge tower in a step pump station system according to the present invention.
Fig. 2 is a second flowchart of a method for determining the height of a surge tower in a step pump station system according to the present invention.
Fig. 3 is a third flowchart of the method for determining the height of the surge tower in the cascade pump station system according to the present invention.
Fig. 4 is a fourth flowchart of the method for determining the height of the surge tower in the step pumping station system according to the present invention.
Fig. 5 is a flowchart of a method for determining an operation mode of a voltage stabilizing tower system in a step pumping station system according to the present invention.
Fig. 6 is a schematic view of a step pumping station system arrangement according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1, an embodiment of the present invention provides a method for determining a height of a voltage stabilizing tower in a step pumping station system, where the method includes the following steps:
s101, according to a water head H in front of an upstream pump station of a pressure stabilizing towerBefore 1 #)And the water head H required after the upstream pumping station1# post-demandDetermining the actual water head H behind the upstream pump station in the combined working condition of each flow and the water level of the upstream water intakePost-actual 1#。
S102 according to the actual water head H behind the upstream pump stationPost-actual 1#Determining the head H of the stabilizer in the combined working condition of each flow and the water level of the upstream water intakePressure stabilizing tower。
S103, according to whether a downstream pump station needs to be pressurized to meet the water receiving level of a secondary water plant, a water head H at the pressure stabilizing tower is connectedPressure stabilizing towerData partitioning into gravity-fed regime parts HGravity flow of pressure stabilizing towerAnd the pressurization condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurization。
In particular, the gravity-fed working condition part HGravity flow of pressure stabilizing towerThe water head at the pressure stabilizing tower under the working condition of the water receiving level of the secondary water plant can be met without opening a downstream pump station by gravity flow, and the pressurizing working condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurizationIn order to meet the water head at the pressure stabilizing tower under the working condition of the water receiving level of a secondary water plant only by starting and pressurizing a downstream pump station,the secondary water plant is a water plant with a pressure stabilizing tower connected through a downstream pump station;
s104 gravity flow working condition part HGravity flow of pressure stabilizing towerIn the water head H at the pressure stabilizing tower corresponding to the maximum flowQMAX pressure stabilizing tower gravity flowPressure operating condition part H of downstream pumping stationPressure stabilizing tower-pump station pressurizationHighest head of water H inMAX surge tower-pump station pressurizationDetermining the elevation Z of the stabilizerPressure stabilizing towerThe lowest value is MAX (H)MAX pressure stabilizing tower gravity flow-hf1# pump-pressure stabilizing tower，HMAX surge tower-pump station pressurization)+HSafety super highSaid H isSafety super highThe safety margin of the elevation of the pressure stabilizing tower is preset.
As shown in fig. 2, preferably, the step S101 specifically includes:
s201 according to water level elevation H of water intakeIntakePipeline head loss h between water intake and upstream pump stationf intake-1 #The difference determines the head H in front of the upstream pumping stationBefore 1 #)Said H isBefore 1 #)＝HIntake-hf intake-1 #。
Pipeline head loss h between water intake and upstream pump stationf intake-1 #＝(n2LQ2)/(A2R4/3) Wherein n is the roughness of the pipeline, L is the length of the pipeline, Q is the flow of the pipeline, A is the area of the pipeline, and R is the wet circumference of the pipeline.
S202, according to the head loss h of the key pipeline between the upstream pump station and the primary water plantf1# KeyAdding the water receiving level H of the primary water plantReceiving water of No. 1 water plantThe sum determines the water head H needed after the upstream pumping station1# post-demand，HPost-1-request＝hf1# Key+HReceiving water of No. 1 water plant。
Head loss h of key pipeline between upstream pump station and primary water plantf1# Key＝(n2LQ2)/(A2R4/3) Wherein n is the roughness of the pipeline, L is the length of the pipeline, Q is the flow of the pipeline, A is the area of the pipeline, R is the wet circumference of the pipeline, in the water supply project containing a plurality of first-level water plants, the key pipeline is from the water intake to a certain water supply pipelineHead loss H between water worksf water intake-1 # water plantPlus the water receiving level H of the water worksReceiving water of No. 1 water plantThe line with the largest sum. The first-level water plant is a water plant with an upstream pump station connected with water supply through a pressure stabilizing tower.
S203, according to the water head H in front of the upstream pump stationBefore 1 #)And the water head H required after the upstream pumping station1# post-demandDetermining the actual head H after the upstream pumping stationPost-actual 1#＝MAX(HBefore 1 #)，HPost-1-request)。
As shown in fig. 3, preferably, the step S102 specifically includes:
s301, acquiring H of the lift of a downstream pump station required by the water receiving level of a secondary water plant in the combined working condition of each flow and the water level of an upstream water intake2# -head；
S302H of the lift of the downstream pump station in a working condition2# -headEqual to or less than zero, the water head H at the pressure stabilizing tower corresponding to the working conditionPressure stabilizing towerDivided into gravity-fed working conditionsGravity flow of pressure stabilizing tower；
S303 if H of the lift of the downstream pump station in a working condition2# -headIf the water head is larger than zero, the water head H at the pressure stabilizing tower corresponding to the working conditionPressure stabilizing towerDivided into downstream pumping station pressurised condition sections HPressure stabilizing tower-pump station pressurization。
As shown in fig. 4, preferably, the said H of the downstream pumping station lift required for satisfying the receiving water level of the secondary water plant2# -headFurther comprising the steps of:
s401 according to the actual water head H behind the upstream pump stationPost-actual 1#And head loss h between upstream and downstream pumping stationsf1# Pump-2 Pump #Determining head H in front of downstream pumping station2# frontA head H in front of the downstream pumping station2# front＝HPost-actual 1#–hf1# Pump-2 Pump #；
S402, according to the head loss h of the key pipeline between the downstream pump station and the secondary water plantf2# KeyPlus the water receiving level H of the secondary water plantReceiving water of 2# waterworksThe sum determines the water head H needed after the downstream pumping station2# post-demand，H2# post-demand＝hf2# Key+HReceiving water of 2# waterworksThe secondary water plant is a water plant with a downstream pump station connected with water supply;
s403, the flow rate and the upstream intake water level are combined, and the H required by the downstream pump station required by the water receiving level of the secondary water plant is met2# post-demandAnd head H in front of downstream pumping station2# frontDetermining the lift H of the down-flow pump station required by satisfying the water receiving level of the secondary water plant in the combined working condition of each flow and the water level of the upstream water intake2# -headThe lift H of the lower flow pump station2# -head＝H2# post-demand–H2# front。
In particular, head loss h between the upstream and downstream pumping stationsf1# Pump-2 Pump #＝(n2LQ2)/(A2R4/3) Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, R is the pipeline wet circumference, the head loss h of the key pipeline between the downstream pump station and the second-level water plantf2# Key＝(n2LQ2)/(A2R4/3) Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, R is the pipeline wet circumference, in the water supply engineering who contains a plurality of second grade water plants, the key pipeline is the head loss h between the downstream pumping station to certain second grade water plantf2# Pump-2 # Water worksPlus the water receiving level H of the second-level water plantReceiving water of 2# waterworksThe line with the largest sum.
As shown in fig. 5, an embodiment of the present invention also provides a method for determining an operation mode of a voltage stabilizing tower system in a step pumping station system, where the method includes the following steps:
s501 Water head H at pressure stabilizing towerPressure stabilizing towerHeight Z of pressure stabilizing towerPressure stabilizing towerAnd a preset safety margin H for the elevation of the voltage stabilizing towerSafety super highObtaining the flow regulating loss h of the flow regulating valve in front of the pressure stabilizing towerf flow regulating valveSaid current regulation loss hf flow regulating valve＝HPressure stabilizing tower–ZPressure stabilizing tower+HSafety super high。
The height Z of the pressure stabilizing towerPressure stabilizing towerIs the implementation of the inventionIn the embodiment, the height of the voltage stabilizing tower in the step pump station system is determined by the method.
S502 if the flow regulation loss hf flow regulating valveIs positive and has an absolute value greater than the safety margin H of the high range of the voltage stabilizing towerSafety super highIf the system is operated in the mode of closing the upstream pump station and the downstream pump station and opening the flow regulating valve to regulate the flow until the flow regulating loss hf flow regulating valve。
S503, if the flow regulation loss hf flow regulating valveIs negative and has an absolute value larger than the safety margin H of the high range of the voltage stabilizing towerSafety super highAnd opening the upstream pump station and the downstream pump station and fully opening the flow regulating valve.
Specifically, if the flow regulating loss hf flow regulating valve is negative and the absolute value is greater than the high safety margin H of the voltage stabilizing tower, the safety is ultrahigh, the lift H of the upstream pump station is adjusted1# -liftAdjusted to H1# -lift＝HPost-1-request–HBefore 1 #)(ii) a Lift H of downstream pumping station2# -headAdjusted to H2# -head＝H2# post-demand–H2# front。
S504 if the flow regulation loss hf flow regulating valveThe absolute value is less than or equal to the height safety margin H of the voltage stabilizing towerSafety super high(ii) a The upstream and downstream pumping stations are closed and the flow regulating valve is fully opened.
The technical solution of the present invention is further described below by using a specific example.
As shown in FIG. 6, it is a schematic diagram of a long pressurized water supply engineering arrangement with a step pump station. The total length of a water supply engineering pipeline is 160km, water is supplied by adopting a pump station pressurization mode, three water receiving plants are totally arranged, two pressurization pump stations are arranged along the way, wherein the 1# pump station supplies water by pressurization in the 1# water plant and the 2# pump station supplies water by pressurization in the 3# water plant. In order to prevent the water hammer from being damaged and enhance the stability of the operation of the system, a pressure stabilizing tower is arranged at a node between the pump stations 1# and 2 #. The lowest water level of the upstream water intake is 56m, and the highest water level is 70 m; the water receiving level of each water plant is more than 4m, and the water receiving flow is 0.68-1.00 times of the designed flow. Table 1 shows the parameters of each section of the pipeline.
TABLE 1 design parameters for each section of pipeline
Figure GDA0002628330270000101
The specific calculation process is as follows: first for the # 1 pump station: firstly, according to the pipeline parameters and actual flow between the water intake and the pump station, the water intake is pushed to the 1# pump station section by section, and the pre-pump head H of the 1# pump is calculatedBefore 1 #)＝HIntake-hf intake-1 #The calculation results are shown in table 2:
meter 2 different water level and flow combined working condition 1# pump station front water head
Figure GDA0002628330270000102
Then calculating the rear water head H of the 1# pump station meeting the flow supply requirementPost-1-request＝hf key+HWater receiving of water works. Selecting a key line according to the water level requirements of 1# and 2# water plants and the water loss coefficient of each pipe section: the pipeline from the pump station to the No. 1 water plant is a key line. The calculation results are shown in table 3:
TABLE 3 Water head required after 1# pump under different water level and flow combined working conditions
Figure GDA0002628330270000103
Subtracting the table 2 from the table 3, namely the pump lift H of the 1# pump station1# -lift＝HPost-1-request–HBefore 1 #)The calculation results are shown in table 4:
TABLE 4 Pump station lift of 1# under different water level and flow combined working conditions
Figure GDA0002628330270000111
Remarking: the "/" in the table indicates that the water level requirement of the water plant can be met only by gravity self-flow without starting the water pump under the water level flow.
Actual water head H behind pump of 1# pump stationPost-actual 1#＝MAX(HBefore 1 #)，HPost-1-request) The calculation results are shown in Table 5.
Table 5 rear water head of 1# pump under different water level and flow combined working conditions
Figure GDA0002628330270000112
First for the # 2 pump station: front water head H of 2# pump station2# front＝HPost-actual 1#–hf1# Pump-2 Pump #The calculation results are shown in table 6:
meter 6 different water level and flow combined working condition 2# pump front water head
Figure GDA0002628330270000113
Then calculating the water level H required after the 2# pump2# post-demandThe calculation results are shown in table 7:
meter 7 water head required after 2# pump under different water level and flow combined working conditions
Figure GDA0002628330270000114
Subtracting the table 6 from the table 3, namely the pump lift H of the 2# pump station2# -head＝H2# post-demand–H2# frontThe calculation results are shown in table 8:
table 8 different water level and flow combined working condition 2# pump station lift
Figure GDA0002628330270000121
Then, the tower front water head H of the pressure stabilizing towerPressure stabilizing tower＝hf1# pump-pressure stabilizing tower-hf1# pump-pressure stabilizing towerThe calculation results are shown in table 9:
meter 9 different water level and flow combined working condition pressure stabilizing tower front water head
Figure GDA0002628330270000122
The water pump head meter calculated by combining the previous section can divide all working conditions into two parts, wherein the left side is a gravity flow working condition, and the right side is a water pump pressurization working condition.
For the water pump pressurization condition: finding out the highest water head H in front of the tower under the condition of water pump pressurization in the table1# rear-demand (HQMAX surge tower-water pump pressurization)24.82 m. For gravity fed conditions: the maximum flow rate is 0.88QrAt this time, the front head H of the pressure stabilizing towerMAX pressure stabilizing tower gravity flow＝26.82m。
And due to Hf1# pump-pressure stabilizing tower11.13m, so MAX (H)MAX pressure stabilizing tower gravity flow-Hf1# pump-pressure stabilizing tower，H1# rear-demand (HQMAX surge tower-water pump pressurization)) 24.82 m. Elevation Z of surge chamberPressure stabilizing towerThe water level is 26m, and the safety margin of 1m is required to be ensured during operation, namely the water level is controlled below 25 m.
According to the set 25m of the height of the pressure stabilizing tower and the safety margin requirement of 1m, the lift H of the water pump under each water level flow working condition can be determined by combining the tables 4 and 81# -lift、H2# -headAnd the flow regulating loss h of the flow regulating valvef flow regulating valveI.e. the operation scheduling mode of the system, as shown in table 10:
running mode of system with different water level and flow combined working conditions of meter 10
Figure GDA0002628330270000131
In the table, the left part is a working condition area of pump closing-valve flow regulation, the figure is the head loss of the flow regulation valve with the least flow regulation, and the corresponding opening degree of the valve can be obtained by combining a valve overflow curve. The middle part is a working condition area with a pump closed and a valve fully opened, in the working condition area, all lines in front of a No. 2 pump station can automatically flow by gravity, and a water head in front of a pressure stabilizing tower is lower than an overflow elevation, so that the flow regulating valve can be kept fully opened. The right side is the operating mode region that the pump opened-valve was opened completely, and the water works can not rely on gravity to flow automatically this moment and supply water, and the pump station needs to be opened, and the figure is the minimum lift of 2# pump station, can look for the corresponding minimum lift of 1# pump station according to table 4. Because the water head in front of the pressure stabilizing tower is lower than the overflow elevation, the flow regulating valve is kept fully open.

Claims (10)

1. A method for determining the height of a voltage stabilizing tower in a step pump station system is characterized by comprising the following steps:
according to the water head in front of the upstream pump station of the pressure stabilizing tower
Figure FDA0002628330260000011
And the head required after the upstream pumping station
Figure FDA0002628330260000012
Determining actual water head behind upstream pump station in combined working condition of each flow and upstream intake water level
Figure FDA0002628330260000013
According to the actual water head behind the upstream pump station
Figure FDA0002628330260000014
Determine head H of stabilizer in combined working condition of each flow and upstream intake water levelPressure stabilizing tower；
According to whether a downstream pump station needs to be pressurized to meet the water receiving level of a secondary water plant or not, a water head H at the pressure stabilizing tower is connected with a water inlet of a water supply systemPressure stabilizing towerData partitioning into gravity-fed regime parts HGravity flow of pressure stabilizing towerAnd the pressurization condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurization(ii) a The gravity-flow working condition part HGravity flow of pressure stabilizing towerThe water head at the pressure stabilizing tower under the working condition of the water receiving level of the secondary water plant can be met without opening a downstream pump station by gravity flow, and the pressurizing working condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurizationThe water head at the pressure stabilizing tower under the working condition that the water receiving level of a secondary water plant can be met only by starting pressurization for a downstream pump station, wherein the secondary water plant is a water plant with the pressure stabilizing tower connected through the downstream pump station;
gravity flow operating mode part HGravity flow of pressure stabilizing towerIn the water head at the pressure stabilizing tower corresponding to the maximum flow
Figure FDA0002628330260000015
Figure FDA0002628330260000016
Pressurizing condition part H of downstream pump stationPressure stabilizing tower-pump station pressurizationHighest head of water in
Figure FDA0002628330260000017
Determining the elevation Z of a stabilizerPressure stabilizing towerThe lowest value is
Figure FDA0002628330260000018
Said HSafety super highThe safety margin of the elevation of the pressure stabilizing tower is preset.
2. The method for determining the height of the surge tower in the step pump station system according to claim 1, wherein the height is determined according to a water head before a pump station at the upstream of the surge tower
Figure FDA0002628330260000019
And the head required after the upstream pumping station
Figure FDA00026283302600000110
Determining actual head behind upstream pump station
Figure FDA00026283302600000111
Further comprising the steps of:
according to water level elevation H of water intakeIntakePipeline head loss between intake and upstream pump station
Figure FDA00026283302600000112
The difference determines the head of the upstream pumping station
Figure FDA00026283302600000113
The above-mentioned
Figure FDA00026283302600000114
Head loss from critical pipeline between upstream pumping station to primary water plant
Figure FDA00026283302600000115
Plus the water receiving level of the first-level water plant
Figure FDA0002628330260000021
The sum determines the water head required behind the upstream pumping station
Figure FDA0002628330260000022
Figure FDA0002628330260000023
Figure FDA0002628330260000024
The primary water plant is a water plant with an upstream pump station connected with water supply through a pressure stabilizing tower;
according to the water head in front of the upstream pump station
Figure FDA0002628330260000025
And the head required after the upstream pumping station
Figure FDA0002628330260000026
Determining actual head behind upstream pump station
Figure FDA0002628330260000027
3. The method for determining the height of a stabilizer in a step pumping station system according to claim 2, wherein the method is based on the actual head behind the upstream pumping station
Figure FDA0002628330260000028
Determine head H of stabilizer in combined working condition of each flow and upstream intake water levelPressure stabilizing towerFurther comprising the steps of:
actual water head behind upstream pump station
Figure FDA0002628330260000029
Reduce head loss between pressure stabilizing towers of upstream pump stations
Figure FDA00026283302600000210
Figure FDA00026283302600000211
Head at the surge tower
Figure FDA00026283302600000212
4. The method for determining the height of a stabilizer in a step pumping station system according to claim 2, wherein the head loss of the pipeline between the intake and the upstream pumping station
Figure FDA00026283302600000213
Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, and R is the pipeline wet circumference.
5. The method for determining the height of a stabilizer tower in a stepped pumping station system according to claim 2, wherein the head loss of the critical pipeline between the upstream pumping station and the primary water plant
Figure FDA00026283302600000214
Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, R is the pipeline wet circumference, in the water supply engineering who contains a plurality of one-level water plants, the key pipeline is the head loss between intake to a certain one-level water plant
Figure FDA00026283302600000215
Adding the water receiving level of the water works
Figure FDA00026283302600000216
The line with the largest sum.
6. The method for determining the height of a surge tower in a step pump station system according to claim 1, wherein a water head H at the surge tower is adjusted according to whether a downstream pump station needs to be pressurized to meet the water receiving level of a secondary water plantPressure stabilizing towerData partitioning into gravity-fed regime parts HGravity flow of pressure stabilizing towerAnd the pressurization condition part H of the downstream pump stationPressure stabilizing tower-pump station pressurizationFurther comprising the steps of:
obtaining the lift of downstream pump station required by the water receiving level of secondary water plant in the combined working condition of each flow and the water level of upstream intake
Figure FDA00026283302600000217
If the lift of a downstream pump station in a working condition
Figure FDA0002628330260000031
Equal to or less than zero, the water head H at the pressure stabilizing tower corresponding to the working conditionPressure stabilizing towerDivided into gravity-fed working conditionsGravity flow of pressure stabilizing tower；
If the lift of a downstream pump station in a working condition
Figure FDA0002628330260000032
If the water head is larger than zero, the water head H at the pressure stabilizing tower corresponding to the working conditionPressure stabilizing towerDivided into downstream pumping station pressurised condition sections HPressure stabilizing tower-pump station pressurization。
7. The method for determining the height of a surge tower in a cascade pump station system according to claim 1, wherein the lift of a downstream pump station required to meet the water receiving level of a secondary water plant is determined
Figure FDA0002628330260000033
Further comprising:
according to the actual water head behind the upstream pump station
Figure FDA0002628330260000034
And head loss between upstream and downstream pumping stations
Figure FDA0002628330260000035
Determining head ahead of downstream pumping station
Figure FDA0002628330260000036
A water head in front of the downstream pump station
Figure FDA0002628330260000037
Figure FDA0002628330260000038
Head loss from critical pipeline between downstream pumping station to secondary water plant
Figure FDA0002628330260000039
Plus the water receiving level of the secondary water plant
Figure FDA00026283302600000310
The sum determines the water head required behind the downstream pumping station
Figure FDA00026283302600000311
Figure FDA00026283302600000312
The secondary water plant is a water plant with a downstream pump station connected with water supply;
the combined working condition of each flow and the water level of the upstream water intake opening meets the requirement of a downstream pump station required by the water receiving level of a secondary water plant
Figure FDA00026283302600000313
And the head in front of the downstream pumping station
Figure FDA00026283302600000314
Determining the lift of the down-flow pump station required by the water receiving level of the secondary water plant in the combined working condition of each flow and the water level of the upstream water intake
Figure FDA00026283302600000315
Figure FDA00026283302600000316
The lift of the down flow pump station
Figure FDA00026283302600000317
8. The method for determining the elevation of a stabilizer in a stepped pumping station system according to claim 7, wherein the head loss between the upstream pumping station and the downstream pumping station
Figure FDA00026283302600000318
Head loss of critical pipeline between downstream pumping station to secondary water plant
Figure FDA00026283302600000319
Wherein n is the pipeline roughness, L is the pipeline length, Q is the pipeline flow, A is the pipeline area, R is the pipeline wet circumference, in the water supply engineering who contains a plurality of second grade water plants, the key pipeline is the head loss between certain second grade water plant to the downstream pump station
Figure FDA00026283302600000320
Plus the water receiving level of the second-level water plant
Figure FDA00026283302600000321
The line with the largest sum.
9. A method for determining the operation mode of a voltage stabilizing tower system in a step pump station system is characterized by comprising the following steps:
head H at the stabilizerPressure stabilizing towerThe stabilizer elevation Z determined by the method of any one of claims 1-8Pressure stabilizing towerAnd a preset safety margin H for the elevation of the voltage stabilizing towerSafety super highFlow regulating loss of flow regulating valve in front of pressure stabilizing tower
Figure FDA0002628330260000045
The flow regulation loss hf flow regulating valve＝HPressure stabilizing tower–ZPressure stabilizing tower+HSafety super high；
If the flow regulation loss
Figure FDA0002628330260000048
Is positive and has an absolute value greater than the safety margin H of the high range of the voltage stabilizing towerSafety super highThe system operation mode is to close the upstream pump station and the downstream pump station and open the flow regulating valve to regulate the flow until the flow regulating loss
Figure FDA0002628330260000049
If the flow regulation loss
Figure FDA0002628330260000046
Is negative and has an absolute value larger than the safety margin H of the high range of the voltage stabilizing towerSafety super highIf so, starting an upstream pump station and a downstream pump station, and fully opening a flow regulating valve;
if the flow regulation loss
Figure FDA0002628330260000047
The absolute value is less than or equal to the height safety margin H of the voltage stabilizing towerSafety super high(ii) a The upstream and downstream pumping stations are closed and the flow regulating valve is fully opened.
10. The method for determining the operation mode of a steady voltage tower system in a step pumping station system according to claim 9, wherein the flow regulation loss h is determined iff regulationFlow valveIs negative and has an absolute value larger than the safety margin H of the high range of the voltage stabilizing towerSafety super highAnd then opening the upstream pump station and the downstream pump station, and fully opening the flow regulating valve, further comprising:
if the flow regulating loss hf flow regulating valve is negative and the absolute value is greater than the high safety margin H of the pressure stabilizing tower, the lift of the upstream pump station is increased
Figure FDA0002628330260000041
Is adjusted to
Figure FDA0002628330260000042
Lift of downstream pumping station
Figure FDA0002628330260000043
Is adjusted to
Figure FDA0002628330260000044
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