CN104674894B - Water system and method for water rationing - Google Patents
Water system and method for water rationing Download PDFInfo
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- CN104674894B CN104674894B CN201410709505.5A CN201410709505A CN104674894B CN 104674894 B CN104674894 B CN 104674894B CN 201410709505 A CN201410709505 A CN 201410709505A CN 104674894 B CN104674894 B CN 104674894B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 678
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Abstract
Present disclose provides a kind of water systems and method of supplying water for water rationing.The water system includes at least: the first water pump group；Second water pump group is connected with the first water pump group and is laminated water supply using the second margin head of the water supply of the first water pump group；First and second water flow sensors are connected respectively to the water outlet of the first and second water pumps group, the first and second water flows of the water supply for detecting the first and second water pumps group respectively；And control cabinet, it is connected respectively with the first water pump group, the second water pump group, the first water flow sensor and the second water flow sensor, and based on detected the first water flow and/or the second water flow, to control the different corresponding work of water pump configuration parameter (Q, H) in the first water pump group and/or the second water pump group.
Description
Technical Field
The present disclosure relates generally to the field of municipal building water supply, and more particularly to a water supply system and method for zoned water supply.
Background
In daily production and life of people, various water resources are inevitably needed. Therefore, the urban water supply system becomes an important part in daily production and life. In the current urban water supply system, particularly in the water supply system of middle and high-rise buildings, the water supply is mainly carried out by adopting a vertical multi-stage pump reservoir type water supply device and/or a non-negative pressure water supply device and the like.
In the traditional vertical multi-stage pump reservoir type water supply equipment, more than 1 vertical multi-stage pump is generally adopted to be combined in parallel, the mutual backup relation among the water pumps is realized, and each pump takes water from the reservoir for 24 hours to supply water to a corresponding area. The water supply mode has the highest energy consumption because the excess pressure of a municipal water supply pipe network is not utilized. If a regional water supply design is adopted for high-rise buildings, a set of secondary water supply equipment needs to be configured in each region during project construction. Because each district supplies water independently, does not have any relevance, has just also caused each district in the constant pressure water supply process, in order to guarantee that the effluent pressure is invariable, the water pump has the corresponding lift work of long-term constant pressure, and this has just caused a large amount of basic energy consumption losses. In addition, because the high-rise building supplies water in different areas, water pump sets in different areas are independent of each other, and a reservoir and the like are required to be configured in the system, the floor area is the largest.
In addition, in the conventional non-negative pressure water supply apparatus, a set of non-negative pressure water supply apparatus is responsible for water supply of the corresponding area. The system generally realizes mutual backup water supply by one or more water pumps connected in parallel. The water pump is intake and is held the inlet tube butt joint stack commentaries on classics pressure through direct and municipal water supply pipe network, and this water supply equipment's benefit directly utilizes municipal pipe network residual pressure all the time, and it can be for above-mentioned storehouse pump water supply mode energy-conservation about 25%. The disadvantage is that the equipment can only be used in small and medium-sized cities with enough abundant water supply in municipal administration networks, but not in central cities (the equipment has great limitation in use).
Similarly, if a design of regional water supply is adopted for high-rise buildings, a set of secondary water supply equipment needs to be configured for each region during project construction, and water supply for each region is independent and has no relevance. The water pump has the problem that the basic energy consumption loss is caused because the water pump works at a corresponding lift with a long-term constant pressure in order to ensure that the water outlet pressure is constant in the constant pressure water supply process of each area. In addition, the high-rise buildings mostly adopt subarea water supply, and water pump sets in all the subareas are independent from each other, so that the occupied area of the water pump sets is large.
Disclosure of Invention
To solve or at least alleviate the above problems, a water supply system and method for zone water supply according to embodiments of the present disclosure are provided.
According to a first aspect of the present disclosure, a water supply system for zoned water supply is provided. The water supply system at least comprises: a first water pump group connected to a municipal water supply network or a pool water tank and overlapping water supply using a first rich lift of water supply of the municipal water supply network; the first water outlet flow sensor is connected to the water outlet end of the first water pump group and used for detecting the first water outlet flow of the water supply of the first water pump group; a second water pump set connected in series with the first water pump set and providing a desired flow of the stacked water supply using an existing head and a surplus flow of the water supply of the first water pump set; the second water outlet flow sensor is connected to the water outlet end of the second water pump group and used for detecting the second water outlet flow of the water supply of the second water pump group; and the control cabinet is respectively connected with the first water pump group, the second water pump group, the first water outlet flow sensor and the second water outlet flow sensor, and controls different water pump configuration parameters in the first water pump group and/or the second water pump group based on the detected first water outlet flow and/or second water outlet flow so as to operate at the optimal working efficiency.
In some embodiments, the water supply system further comprises: a third water pump group connected in series with the second water pump group and providing the superposed water supply of a required flow rate by using the existing head and the surplus flow rate of the water supply of the second water pump group; and the control cabinet is also respectively connected with the third water pump group and the third water outlet flow sensor, and controls different water pump configuration parameters in the first water pump group, the second water pump group and/or the third water pump group based on the detected first water outlet flow, second water outlet flow and/or third water outlet flow so as to operate at the optimal working efficiency.
In some embodiments, all of the water pump sets are located in the same plant room.
In some embodiments, the control cabinet controls each water pump set according to the following formula: w ═ Wmin+ΔW1+ΔW2Wherein W represents a unit power consumption value of the water pump group, WminRepresents the minimum unit power consumption value, AW, of the water pump set1Represents an additional specific power consumption value, AW, due to deviation of the actual operating efficiency of the water pump group from the maximum efficiency2Represents an extra unit power consumption value caused by the fact that the water pump set has an abundant head during actual operation, wherein the control cabinet controls each water pump set to minimize the AW1+ΔW2。
In some embodiments of the present invention, the, wherein Q represents the total flow of the water pump set, t represents time, H (Q, t) represents the total lift actually provided by the water supply system under the working condition (Q, t), η (Q, H) represents the overall operating efficiency of the water pump set under the working condition (Q, H), and H (Q, H) represents the total flow of the water pump setGeneral assembly(Q, t) represents the desired total head of the water supply system at operating condition (Q, t), ηmax(Q, H) represents the maximum efficiency of the water pump group under the working conditions (Q, H), and Δ η (Q, H) represents η (Q, H) and ηmaxThe deviation in efficiency between (Q, H), Δ H (Q, t) denotes H (Q, t) and HGeneral assemblyThe difference between (Q, t).
In some embodiments, each water pump set consists of one or more SUS304 stainless steel pumps, one or more shut-off valves corresponding to each SUS304 stainless steel pump, and one or more butterfly valves.
In some embodiments, the water supply system further comprises: a first temperature sensor connected to the first water pump set and the control cabinet for detecting a water temperature of the first water pump set; and the first overtemperature drainage electromagnetic valve is connected to the first water pump group and the control cabinet and is used for draining water under the condition that the first temperature sensor detects that the water temperature exceeds a preset threshold value, so that the first water pump group is prevented from being damaged in service life due to scalding.
In some embodiments, the water supply system further comprises: a second temperature sensor connected to the second water pump set and the control cabinet for detecting a water temperature of the second water pump set; and the second overtemperature drainage electromagnetic valve is connected to the second water pump group and the control cabinet and is used for draining water under the condition that the second temperature sensor detects that the water temperature exceeds a preset threshold value, so that the service life of the second water pump group is prevented from being shortened due to scalding.
In some embodiments, the water supply system further comprises: a first pressure sensor connected to the water outlet end of the first water pump group to measure a first water outlet pressure of the first water pump group; and the second pressure sensor is connected to the water outlet end of the second water pump group to measure the second water outlet pressure of the second water pump group, wherein the control cabinet also controls the working power of each water pump group according to the first water outlet pressure and/or the second water outlet pressure.
According to a second aspect of the present disclosure, a method for zonal water supply is provided. The method comprises the following steps: controlling a first water pump set connected to a municipal water supply network or a pool water tank to stack water supply using a first rich lift of water supply of the municipal water supply network; detecting a first outlet flow rate of the supply water of the first water pump set using a first outlet flow rate sensor connected to an outlet end of the first water pump set; controlling a second water pump set in series with the first water pump set to stack the supply water with a second rich lift of the supply water of the first water pump set; detecting a second outlet flow rate of the supply water of the second water pump set using a second outlet flow rate sensor connected to the outlet end of the second water pump set; and controlling the working power of the water pumps in the first water pump group and/or the second water pump group based on the detected first water outlet flow and/or second water outlet flow.
In some embodiments, the method further comprises: controlling a third water pump set in series with the second water pump set to stack the supply water with a third rich lift of the supply water of the second water pump set; detecting a third outlet flow rate of the supply water of the third water pump group using a third outlet flow rate sensor connected to the outlet end of the third water pump group; and controlling the working power of the first water pump group, the second water pump group and/or the third water pump group based on the detected first water outlet flow, second water outlet flow and/or third water outlet flow.
In some embodiments, all of the water pump sets are located in the same plant room.
In some embodiments, each water pump group is controlled according to the following formula: w ═ Wmin+ΔW1+ΔW2Wherein W represents a unit power consumption value of the water pump group, WminRepresents the minimum unit power consumption value, AW, of the water pump set1Represents an additional specific power consumption value, AW, due to deviation of the actual operating efficiency of the water pump group from the maximum efficiency2Represents an extra unit power consumption value due to the fact that the water pump groups are actually operated with rich lift, wherein each water pump group is controlled to minimize delta W1+ΔW2。
In some embodiments of the present invention, the, wherein Q represents the total flow of the water pump group, t represents time, and H (Q, t) tableIndicating the total head actually provided by the water supply system under the working condition (Q, t), η (Q, H) indicating the overall operating efficiency of the water pump set under the working condition (Q, H), HGeneral assembly(Q, t) represents the desired total head of the water supply system at operating condition (Q, t), ηmax(Q, H) represents the maximum efficiency of the water pump group under the working conditions (Q, H), and Δ η (Q, H) represents η (Q, H) and ηmaxThe deviation in efficiency between (Q, H), Δ H (Q, t) denotes H (Q, t) and HGeneral assemblyThe difference between (Q, t).
In some embodiments, each water pump set consists of one or more SUS304 stainless steel pumps, one or more shut-off valves corresponding to each SUS304 stainless steel pump, and one or more butterfly valves.
In some embodiments, the method further comprises: detecting a water temperature of the first water pump group using a first temperature sensor connected to the first water pump group; and controlling a first over-temperature water discharge solenoid valve connected to the first water pump group to discharge water if the first temperature sensor detects that the water temperature exceeds a predetermined threshold value, so as to avoid the first water pump group from having a reduced service life due to scalding.
In some embodiments, the method further comprises: detecting a water temperature of the second water pump group using a second temperature sensor connected to the second water pump group; and controlling a second over-temperature water discharge solenoid valve connected to the second water pump group to discharge water in case that the second temperature sensor detects that the water temperature exceeds a predetermined threshold value, so as to prevent the second water pump group from having a reduced service life due to scalding.
In some embodiments, the method further comprises: measuring a first outlet water pressure of the first water pump group using a first pressure sensor connected to an outlet water end of the first water pump group; measuring a second outlet water pressure of the second water pump set using a second pressure sensor connected to the outlet water end of the second water pump set; and controlling the working power of each water pump group according to the first outlet water pressure and/or the second outlet water pressure.
By using the water supply system and the method, the problem of high energy consumption of the traditional reservoir pump and the non-negative-pressure secondary water supply complete equipment at present can be solved, the problem that the traditional secondary water supply equipment does not have overheat protection on the water pump is solved, the problem that the traditional secondary water supply equipment does not introduce water flow accurate control to improve the high-efficiency point work of the water pump is solved, and the problems that the traditional secondary water supply complete equipment is difficult to maintain and occupies a large area are solved.
Specifically, according to the water supply system disclosed by the embodiment of the disclosure, the purpose of high-rise partitioned water supply is realized by stacking and pressing each independent water supply pump set for partitioned water supply through a cross-connection type combined structure according to the layer-by-layer stacking principle, so that the purpose of saving the low-area lift during middle-area water supply and saving the middle-area lift during high-area water supply is achieved, and the purpose of energy conservation is further realized.
In addition, the pumps with different rated flow powers in each area are accurately calculated and controlled by the detection of the water outlet flow of each area and the cooperation of a central processing unit in the control cabinet, so that intelligent water supply is realized. The method aims to calculate and find the working state of the pump corresponding to the maximum efficiency point and the minimum rich lift of each pump under different water flow working conditions. The purpose is to strictly control the low efficiency and the surplus waste of the head caused by unreasonable configuration and operation and realize the purpose of energy conservation.
In addition, the water pump group for supplying water to high-rise subareas (for example, more than 2 areas) is designed to be superposed in the air by the water pumps on the basis of occupying the using area of one area, so that the position of one set of equipment occupied by multiple areas is realized, and the aim of supplying water to the subareas is fulfilled. Here, an air-stack design generally refers to starting with a low pressure pump group, a middle zone pump group stacking on top of the low zone pump group by support, and so on. Therefore, high equipment integration level is realized, and the occupied area is saved.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following description of preferred embodiments of the disclosure, taken in conjunction with the accompanying drawings, in which:
fig. 1 is an exemplary schematic diagram illustrating a water supply system for zone water supply according to an embodiment of the present disclosure.
FIG. 2 is an energy-saving schematic diagram illustrating an example stacked water supply according to an embodiment of the present disclosure.
Fig. 3 is a flowchart illustrating an example water supply control method performed at a control cabinet according to an embodiment of the present disclosure.
Detailed Description
In the following detailed description of the preferred embodiments of the present disclosure, reference is made to the accompanying drawings, in which details and functions that are not necessary for the disclosure are omitted so as not to obscure the understanding of the present disclosure. It should be understood that: the following description is only for completeness, clarity and full understanding of the essential inventive concepts of the present invention to enable one skilled in the art to practice the embodiments of the present disclosure, and should not be taken as limiting the scope of protection of the present invention.
Furthermore, although different features may be described in different embodiments, this does not imply that these features cannot be used in combination. In fact, it is to be understood that these technical features, or even different technical solutions, may be used in combination to advantage without explicit recitation to the contrary.
Moreover, in the present disclosure, the use of the terms "first," "second," "third," etc. are used merely to distinguish different elements having the same name, and should not be construed as having a different priority or order. For example, a "first water pump set" does not necessarily have priority over a "second water pump set", or it is not necessary to have a first water pump set before a "second water pump set", etc. Similarly, the "first effluent flow rate" is not necessarily greater than, less than, or equal to the "second effluent flow rate", and the magnitude relationship therebetween is not defined by the "first" or "second", etc.
Next, the inventive principles according to the embodiments of the present disclosure will be briefly described.
For the water pump(s), it should satisfy the following formula:
pump power pump efficiency head flow density gravity acceleration
Wherein, generally, the unit of power is kilowatt, the unit of efficiency is nothing, the unit of lift is meter, and the unit of flow is meter3In seconds, the unit of density is "kg/m3", the unit of gravitational acceleration is" m/s2Or "cattle per kilogram". Of course, the present invention is not limited thereto, and other unit systems may be employed. In addition, the left side of the equation is equivalent to the effective power of the water pump. The above formula is equivalently transformed into units common in the art, and the following formula is obtained:
wherein W is the unit power consumption value (in kilowatt-hour/cubic meter) of the water pump (group), and Q is the flow rate (in meter)3In seconds), H (Q, t) is the total head (in meters) provided by the pump(s) under operating conditions (Q, t), η (Q, H) is the overall operating efficiency (generally expressed in percentages) of the pump(s)3The acceleration of gravity was 9.8 n/kg, and the second was converted to hour, to obtain formula (1).
Note that H (Q, t) is generally a function of flow Q and time t, the magnitude of which is related to the water supply pipeline process requirements and the capacity of the water pump(s) themselves. η (Q, H) is a function of flow Q and head H (Q, t). in one embodiment, η (Q, H) can be calculated as follows:
η(Q，H)＝η1(Q，H)×η2(Q，H)×η3(Q，H) (2)
in formula (2), η1(Q, H) indicates the water pump (group) operation efficiency, η2(Q, H) is the water pump motor operating efficiency, η3(Q, H) is the running efficiency η of the water pump speed regulating device1(Q，H)，η2(Q, H) and η3(Q, H) are each a function of the pump flow Q and head H (Q, t), which also vary as the pump flow Q and head H (Q, t) vary. Please note that: here, for simplicity of description, the efficiency of the hardware itself, such as the water pump, the motor coupling, etc., is omitted.
Assuming that the total lift required by the secondary water supply process is HGeneral assembly(Q, t), the total head provided by the water pump rating is H (Q, t), and the wasted head is Δ H (Q, t), as shown in the following equation:
ΔH(Q，t)＝H(Q，t)-Hgeneral assembly(Q，t) (3)
The overall efficiency η (Q, H) of the pump varies with the flow Q and the nominal total head H (Q, t) of the pump, and for a given operating condition (Q, H), among the different adjustment modes that the pump group equipment can take, there is an operating mode with the best overall efficiency, at which the water pump (group) has the maximum efficiency value, which can be designated ηmax(Q, H.) in some embodiments, the ηmaxIn some embodiments, it is a maximum value for constrained regulation, and further, the actual overall operating efficiency η (Q, H) of the water pump (group) is the same as the maximum efficiency ηmaxThe difference between (Q, H), may be referred to as the efficiency deviation Δ η (Q, H):
Δη(Q，H)＝ηmax(Q，H)-η(Q，H) (4)
the unit electricity consumption expression (1) of the water pump (group) becomes:
W＝Wmin+ΔW1+ΔW2 (5)
wherein,Wminrepresents the minimum unit power consumption value, AW, of the water pump set1Represents an additional specific power consumption value, AW, due to deviation of the actual operating efficiency of the water pump group from the maximum efficiency2The additional unit power consumption value caused by the fact that the water pump group is actually operated and has rich lift is represented.
More specifically, in one embodiment, in equation (5), and
first portion W in formula (5)minRepresents the minimum ton water energy consumption which can be realized by the water pump (group), which is also the target power consumption which should be pursued when the control cabinet adjusts each water pump group. (5) Δ W in the formula1+ΔW2The energy-saving potential of the water pump (group) under the current working condition is represented, and the negative ton water power consumption of the water pump (group) is recorded as delta W:
ΔW＝ΔW1+ΔW2 (6)
as described above, the first portion Δ W in the formula (6)1Due to pump operating efficiency η (Q, H) deviating from maximum efficiency ηmax(Q, H) results in a power saving potential (or waste of power) due to the efficiency deviation Δ η (Q, H), while the second part is due to the pump's rich head Δ H (Q, t).
More generally, the maximum efficiency point and the minimum surplus head of the corresponding pump can be reached by feeding back the detected water supply flow to a central control unit (for example, a control cabinet) in real time, and finding the corresponding pump operation according to the set curve characteristic of the corresponding pump operating condition through modeling in a program of the central control unit. For example, for one flow rate Q-30 m3In the water pump with the rated lift H of 42 m/hour, the rated flow Q of the water pump is reduced when the pump lift H is increased according to the characteristic curve of the water pump, and the flow Q is 30m3When the flow rate is reduced to 0/hour, the pump head H can be from 42m to 65 m. In this case, it can be concluded that: when the water outlet flow of the water pump is dynamically changed, the lift of the water pump is also atAnd (4) dynamically changing. The system optimizes the high-efficiency working purposes of each pump: the specific control of the high-efficiency point of the water pump can be determined according to the type selection of the water pump, namely, the water pump is controlled to work in the range of the high-efficiency point in the characteristic curve of the water pump. After the water pumps are selected, high efficiency point values of all the pumps can be set in a modeling mode in a program of a central controller, dynamic data of pump flow are collected by the program, comparison with the setting of the modeling mode in the program of the central controller is completed, and corresponding pump parameters are dynamically switched to work. Thus, in some embodiments, a fixed efficiency reference is not typically preset, but is dynamically adjusted by the human-machine dialog window configured by the control system according to the actual situation. The specific adjustment method can refer to the above formula and the following description. Of course, in other embodiments, a reference empirical value may be given, for example, to ensure that the maximum efficiency regulation range is between plus or minus 15% of the rated flow rate of the water pump based on the water pump profile.
Therefore, the inventive concept of the present disclosure provides an energy-saving technique for realizing the lowest power consumption (and target power consumption) of pump water delivery by stacking from low to high under the condition of satisfying the process requirements of water supply in each partition. The theoretical basis is as follows: in any water transport system, there is a unit of electrical power consumption (kilowatt-hours/m) corresponding to the operating conditions (system operating parameters) of the system3) The "efficiency deviation" is always preferred in some embodiments when adjusting, because the pump head is primarily referred to as the physical head surplus that must be higher than the actual process head when the pump is selected, and therefore the head surplus is secondary.
FIG. 1 shows a schematic diagram of a water supply system according to one embodiment of the present disclosure and a method of operating the water supply systemThe series technology realizes that the middle area water pump group is directly connected with the low area water pump group in series to realize the middle area water supply, and the series connection directly saves the surplus lift delta H of the low areaIs low in(Q, t); and the high-region water pump set is directly connected in series with the middle-region water pump set to realize high-region water supply, and the series connection directly saves the surplus lift delta H of the middle regionIn(Q, t). Therefore, the water supply system is adopted to minimize the unit power consumption during the operation of the system in the process of conveying water. In this way, the operation power consumption of the water conveying system is minimized, and the maximum power saving and energy saving benefits can be obtained at the same time, so that the economic operation of the water conveying system is realized.
In the embodiment shown in fig. 1, the water supply system may include a plurality of sets of water pumps and supply water for different zones. In some embodiments, each water pump set may include one or more water pumps, one or more shut-off valves corresponding to each water pump, and one or more butterfly valves. In some embodiments, the stop valve may be disposed at the water outlet end of each water pump, and is configured to ensure that, during the water supply process of a group of water pumps, when any one or more of the pumps works, other pumps that do not work do not generate return water, and thus internal circulation is not formed, thereby ensuring that the water outlet of the water pumps always performs effective work. In some embodiments, a butterfly valve may be provided at the inlet end and/or the outlet end of each pump. In one or more embodiments, the butterfly valve may be a manual butterfly valve. The butterfly valve is used for cutting off a water source when the water pump is overhauled or maintained, so that the maintenance of a fault water pump is facilitated, and the water supply stop of the whole system is avoided.
More specifically, in the embodiment shown in fig. 1, the water supply system comprises three water pump groups, which supply water to the first zone (lower zone 6), the second zone (middle zone 10) and the third zone (upper zone 12), respectively. In some embodiments, the water supply pressure in the low region may be in a range of 3.5-5 Kg, the water supply pressure in the middle region may be in a range of 7.0-9.0 Kg, and the water supply pressure in the high region may be in a range of 10.0-13.0 Kg. Of course, those skilled in the art will appreciate that the present invention is not so limited. In other embodiments, the zone water supply pressure is not limited to the above numerical range.
In the embodiment shown in fig. 1, each water pump set may include two individual water pumps 2, 8 and/or 11 (e.g., SUS304 stainless steel submersible pumps), each of which may be connected to a municipal water supply line or a sink-tank line 1 or a previous stage water pump set. In addition, a shut-off valve is connected to the front and rear (water inlet and outlet) of each pump, as shown in fig. 1, and a butterfly valve is connected to the rear (water outlet) of each pump. The use of a shut-off valve and/or butterfly valve effectively assists the water supply system in controlling the flow direction/opening/closing etc. of the water. Of course, the present invention is not limited thereto. In other embodiments, the number and/or location of the installed shut-off/butterfly valves may be different and are not limited to the embodiment shown in FIG. 1. In addition, the series connection between the water pump sets can be realized through a pump water inlet laminated pipeline 7, and a stop valve can be arranged on the pump water inlet laminated pipeline 7.
In addition, a flow sensor 4 for detecting the amount of discharged water and a pressure sensor 5 for detecting the water pressure are provided for the water outlet end of each water pump group.
In some embodiments, the effluent flow sensors 4 of each zone are used for optimizing system energy consumption, and scientifically realizing that the water pump with the highest efficiency point is selected to operate when the flow changes in different time periods, so that the energy-saving effect is achieved. For example: the actual water flow of each area is fed back through the flow sensor, and the corresponding water pump is selected to form an area water supply pump set system under the condition that the actual peak instantaneous maximum and the valley instantaneous minimum flow are fully considered in the water pump model selection of each area. When the system normally works, the water outlet of each area dynamically acquires flow data through the flow sensor and transmits the flow data to a central control unit (for example, a control cabinet), after the internal program of the central control unit is modeled, the actual flow data is compared with the program modeling data, the water consumption of each area corresponds to the dynamic water consumption according to different time nodes, and the pumps corresponding to parameters in the pump set of the real-time dynamic scheduling system are started, so that the maximum efficiency operation of each pump during working is always ensured, the aim of optimizing the efficiency of the water pump and saving energy is achieved, and meanwhile, convenience is provided for realizing the cloud online real-time monitoring of the water consumption data of each area for water supply enterprises.
In addition, in some embodiments, during normal operation of the system, the low-zone pump set can meet the water supply flow of the low-zone users and simultaneously continue to provide the flow required by the middle-high zone to the middle-zone pump set for superposition. The water intake of the middle region water supply pump is superposed on the basis of pumping water from the low region, the water intake of the high region water supply pump set is superposed on the basis of pumping water from the middle region, and so on. Of course, the present invention is not limited thereto. For example, in other embodiments, water may be supplied for only two zones, and thus only two water pump sets; or in still other embodiments, water may be supplied for four and more divisions, so that there may be four and more water pump groups.
Furthermore, in some embodiments, a temperature sensor 3 and an over-temperature drain solenoid valve 9 may also be provided for each water pump in each water pump group. When the temperature sensor 3 detects that the water temperature of the water pump set rises due to overhigh temperature of the water pump in the small-flow or no-flow constant-pressure water supply process, the control cabinet can automatically control the over-temperature water discharge electromagnetic valve 9 to open the valve to discharge water and return the water to the water pool or the water inlet front end of the water pump, so that the water pump set is prevented from being damaged, and the service life of the water pump is shortened.
Specifically, during normal operation of each pump, if the system is empty or low flow, the pump still needs to be operated in order to maintain the system pipe holding pressure. Under this condition, the water pump just probably causes the water pump high temperature because of no flow or undersize flow, if can not the water pump cooling this moment, because of the water pump high temperature causes the sealed quick wearing and tearing of water pump and motor insulation ageing to the life of water pump has been reduced. When the system normally works, as described above, the actual working temperature of the water pump is fed back in real time through the temperature sensor 3 and transmitted to the central control unit, the central control unit sets a safe allowable running temperature value (threshold value) of the water pump through an internal program for comparison, when the temperature of the water pump is greater than the safe value, the central control unit drives the drainage electromagnetic valve 9 to drain water for the over-temperature water pump, and the drainage is stopped when the water level temperature of the water pump is recovered to the normal temperature value. In some embodiments, the drain may be collected by a conduit to a stainless steel water tank for later use or for other purposes, which allows for recovery of the drain while ensuring the normal service life of the pump.
In addition, the water outlet flow sensor dynamically feeds the water outlet flow of the water pump groups corresponding to each area to an intelligent control center (control cabinet), and the intelligent control center calculates and compares the water outlet flow with the water pump groups corresponding to each area, so that the work switching of different water pumps of the pump groups corresponding to each area can be dynamically controlled. The water supply monitoring system is used for ensuring that the water flow corresponds to the work of a water pump with reasonable flow, monitoring the data of the water supply amount of each regional water pump group at different time nodes, providing data support for scientific water supply, simultaneously realizing that the operation energy consumption of each regional water pump is always/as much as possible at a high efficiency point, and achieving the effect of optimizing energy conservation.
In some embodiments, all of the devices of the water supply system may be located within the same equipment room. In a preferred embodiment, the entire facility may be located within an underground facility room, and the water supply for each zone is delivered to the user for each zone via a conduit for each zone.
In addition, in the embodiment shown in fig. 1, the water supply pressure of the municipal pipe network can be directly superposed to realize the water supply by utilizing the municipal excess pressure. Of course, in other embodiments, the continuous reservoir pump water supply may be realized by directly taking water from the water tank or the water pool, or the water pump set may be realized by matching with the intelligent water inlet pressure-superposed device (chinese patent application No. CN201310396340.6, publication No. CN103422540A, entitled "intelligent water inlet pressure-superposed device", which is incorporated herein by reference in its entirety) also applied by the present inventor, and this water inlet mode mainly solves the problem of insufficient flow of the peak municipal pipe network, the pump set dynamically fetches water by a water tank water supplementing mode, the municipal water fetching flow value is dynamically controlled by the water output flow sensors of the pump sets, the pump sets are ensured to fully utilize municipal residual pressure when working and cannot use water at municipal peak, it surpasss the normal flow that municipal pipe network project design pipe diameter corresponds, draws low municipal pipe network pressure, influences municipal administration water user normal water when causing the peak. Furthermore, in some embodiments, a suitable buffer tank may be provided for buffering the supply of water.
The water supply superposition principle realizes a large amount of energy conservation in the secondary water supply process. The water supply requirement under the same condition is calculated based on a theoretical formula, and water is supplied by a superposition series principle, so that the energy consumption is directly saved by more than 40% compared with the traditional water supply. The water pumps (groups) in each area can acquire dynamic data of instruments of the field series water pump groups through an intelligent control cabinet system (not shown in figure 1), automatically control the water pumps (groups) to coordinate water supply in the whole process, and accurately control the water supply process of secondary water supply equipment so as to realize the lowest energy consumption, improve the continuity, high efficiency and stability of water supply, and achieve the purposes of saving electricity, water and land and the like.
Fig. 2 shows a schematic view of the energy saving principle adopted by the pressure-superposed water supply system according to the embodiment shown in fig. 1. In the coordinate system of fig. 2, the horizontal axis represents that each water pump set is installed on the same floor in the water supply subarea embodiment, and the vertical axis represents the water pump laminating manner of each water pump in the water supply subarea embodiment corresponding to the floor height. In fig. 2, it is clearly seen that the surplus head of the low zone water supply is fully utilized when the middle zone water supply is performed, and the surplus head Δ H of the low zone water pump group is avoidedIs low in(Q, t) (shown by the dashed arrows in FIG. 2). Similarly, the abundant lift delta H of the middle water supply is fully utilized when the high water supply is carried outIn(Q, t). Waste of the surplus head of the middle zone water pump group is avoided (indicated by the dashed arrow in fig. 2).
In a more specific embodiment, for example, in a stacked water supply system according to an embodiment of the present disclosure, it includes 4 integrated water pumps (groups), wherein 1 is used as a supplement/backup water supply pump for a high area, and the other 3 water pumps are stacked in series in a manner according to an embodiment of the present disclosure and supply water to users in three areas, namely, low area, medium area and high area, and the water pumps (groups) are controlled by frequency conversion. Under normal operating mode, this system is direct from municipal pipe network water intaking, and when detecting that municipal pipe network pressure is low (for example, 0.1Mpa), system's water intaking automatic switch to the water tank, and the water tank is supplied water by municipal pipe network, and its water level is controlled by the ball valve.
In comparison with the conventional parallel water supply system, for example, in a period of approximately 24 hours, a comparison of the system according to the embodiment of the present application and the conventional system is shown in table 1 below, with the supply water pressure of each zone and the tank water level being maintained substantially identical.
TABLE 1 comparison of existing Water supply systems with stacked energy-saving Water supply systems
From table 1, it can be clearly seen that the unit used amount of water supply of the laminated water supply system according to the embodiment of the present application is only about 1/3 of the existing system in the case where substantially the same amount of water supply is provided during substantially the same operation time.
FIG. 3 is a flow chart illustrating a method 400 for controlling zone water supply that may be performed in a control cabinet (control center) according to an embodiment of the present disclosure. As shown in fig. 3, the method 400 may include steps S410, S420, S430, S440, and S450. Some of the steps of method 400 may be performed separately or in combination, and may be performed in parallel or sequentially in accordance with the present disclosure and are not limited to the specific order of operations shown in fig. 3. In some embodiments, the method 400 may be performed by a control cabinet or software installed thereon. In other embodiments, the method 400 may be performed by a plurality of different entities at a plurality of different locations, respectively, to achieve the same effect.
The method 400 begins at step S410, where a first water pump set coupled to a municipal water supply network or a sink tank may be controlled by a control cabinet to stack the water supply with a first head of the water supply of the municipal water supply network at step S410.
In step S420, a first outlet flow rate of the water supplied by the first water pump group may be detected by the control cabinet using a first outlet flow rate sensor connected to the outlet end of the first water pump group.
In step S430, a second water pump set in series with the first water pump set may be controlled by the control cabinet to stack the supply water using a second head of the supply water of the first water pump set.
In step S440, a second outflow of water from the second water pump group may be detected by the control cabinet using a second outflow sensor connected to the outflow end of the second water pump group.
In step S430, the control cabinet may control the operating power of the water pumps in the first water pump group and/or the second water pump group based on the detected first outlet water flow and/or second outlet water flow.
In some embodiments, the method 400 may further include: controlling a third water pump set in series with the second water pump set to stack the supplied water using a third rich lift of the supplied water of the second water pump set; detecting a third outlet flow rate of the supply water of the third water pump group using a third outlet flow rate sensor connected to the outlet end of the third water pump group; and controlling the working power of the first water pump group, the second water pump group and/or the third water pump group based on the detected first water outlet flow, the detected second water outlet flow and/or the detected third water outlet flow.
In some embodiments, all of the pump banks may be located in the same equipment room.
In some embodiments, the control cabinet may control the individual water pump sets according to the following formula: w ═ Wmin+ΔW1+ΔW2Wherein W represents a unit power consumption value of the water pump group, WminRepresents the minimum unit power consumption value, AW, of the water pump set1Represents an additional specific power consumption value, AW, due to deviation of the actual operating efficiency of the water pump group from the maximum efficiency2Represents an extra unit power consumption value due to the fact that the water pump groups are actually operated with rich lift, wherein each water pump group is controlled to minimize delta W1+ΔW2。
In some embodiments of the present invention, the, wherein Q represents the total flow of the water pump set, t represents time, H (Q, t) represents the total lift actually provided by the water supply system under the working condition (Q, t), η (Q, H) represents the overall operating efficiency of the water pump set under the working condition (Q, H), and H (Q, H) represents the total flow of the water pump setGeneral assembly(Q, t) represents the expected total head of the water supply at operating condition (Q, t), ηmax(Q, H) represents the maximum efficiency of the water pump group under the working conditions (Q, H), and Δ η (Q, H) represents η (Q, H) and ηmaxThe deviation in efficiency between (Q, H), Δ H (Q, t) denotes H (Q, t) and HGeneral assemblyThe difference between (Q, t).
In some embodiments, each water pump set may be comprised of one or more SUS304 stainless steel pumps, one or more shut-off valves corresponding to each SUS304 stainless steel pump, and one or more butterfly valves.
In some embodiments, the method 400 may further include: detecting a water temperature of the first water pump group using a first temperature sensor connected to the first water pump group; and controlling a first over-temperature water discharge solenoid valve connected to the first water pump group to discharge water when the first temperature sensor detects that the water temperature exceeds a predetermined threshold value, so as to avoid the first water pump group from having a reduced service life due to scalding.
In some embodiments, the method 400 may further include: detecting a water temperature of the second water pump group using a second temperature sensor connected to the second water pump group; and controlling a second over-temperature water discharge solenoid valve connected to the second water pump group to discharge water under the condition that the second temperature sensor detects that the water temperature exceeds a preset threshold value, so as to protect the second water pump group from reducing the service life due to scalding.
In some embodiments, the method 400 may further include: measuring a first outlet water pressure of the first water pump group using a first pressure sensor connected to the outlet water end of the first water pump group; measuring a second outlet water pressure of the second water pump set using a second pressure sensor connected to the outlet water end of the second water pump set; and controlling the working power of each water pump group according to the first outlet water pressure and/or the second outlet water pressure.
The invention has thus been described with reference to the preferred embodiments. It should be understood by those skilled in the art that various other changes, substitutions, and additions may be made without departing from the spirit and scope of the invention. The scope of the invention is therefore not limited to the particular embodiments described above, but rather should be determined by the claims that follow.
Claims (8)
1. A water supply system for zoned water supply comprising at least:
a first water pump group connected to a municipal water supply network or a pool water tank and overlapping water supply using a first rich lift of water supply of the municipal water supply network;
the first water outlet flow sensor is connected to the water outlet end of the first water pump group and used for detecting the first water outlet flow of the water supply of the first water pump group;
a second water pump set connected in series with the first water pump set and providing a desired flow of the stacked water supply using an existing head and a surplus flow of the water supply of the first water pump set;
the second water outlet flow sensor is connected to the water outlet end of the second water pump group and used for detecting the second water outlet flow of the water supply of the second water pump group;
a third water pump group connected in series with the second water pump group and providing the superposed water supply of a required flow rate by using the existing head and the surplus flow rate of the water supply of the second water pump group;
the third water outlet flow sensor is connected to the water outlet end of the third water pump group and used for detecting the third water outlet flow of the water supply of the third water pump group; and
the control cabinet is respectively connected with the first water pump group, the second water pump group, the first water outlet flow sensor, the second water outlet flow sensor, the third water pump group and the third water outlet flow sensor, different water pump configuration parameters in the first water pump group, different water pump configuration parameters in the second water pump group and/or different water pump configuration parameters in the third water pump group are controlled according to the detected first water outlet flow, efficiency deviation is preferentially adjusted by the control cabinet, surplus lift deviation is then adjusted to minimize the integral extra unit power consumption value of each water pump group,
wherein, all water pump groups and the control cabinet are integrated into a set of equipment and installed in the same equipment room.
2. A water supply system according to claim 1 wherein the control cabinet controls each water pump group according to the formula:
W＝Wmin+ΔW1+ΔW2
wherein W represents the unit power consumption value of the water pump set, WminRepresents the minimum unit power consumption value, AW, of the water pump set1Represents an additional specific power consumption value, AW, due to deviation of the actual operating efficiency of the water pump group from the maximum efficiency2Represents an extra unit power consumption value caused by the fact that the water pump group actually operates and has rich lift,
wherein, theThe control cabinet controls each water pump set to minimize delta W1+ΔW2。
3. The water supply system according to claim 2,
wherein Q represents the total flow of the water pump set, t represents time, H (Q, t) represents the total lift actually provided by the water supply system under the working condition (Q, t), η (Q, H) represents the overall operating efficiency of the water pump set under the working condition (Q, H), and H (Q, H) represents the total flow of the water pump setGeneral assembly(Q, t) represents the desired total head of the water supply system at operating condition (Q, t), ηmax(Q, H) represents the maximum efficiency of the water pump group under the working conditions (Q, H), and Δ η (Q, H) represents η (Q, H) and ηmaxThe deviation in efficiency between (Q, H), Δ H (Q, t) denotes H (Q, t) and HGeneral assemblyThe difference between (Q, t).
4. The water supply system according to claim 1, wherein each water pump group is composed of one or more SUS304 stainless steel pumps, one or more shut-off valves corresponding to each SUS304 stainless steel pump, and one or more butterfly valves.
5. The water supply system according to claim 1, further comprising:
a first temperature sensor connected to the first water pump set and the control cabinet for detecting a water temperature of the first water pump set; and
the first over-temperature water discharging electromagnetic valve is connected to the first water pump group and the control cabinet and used for discharging water when the first temperature sensor detects that the water temperature exceeds a preset threshold value, so that the first water pump group is prevented from being damaged by scalding and the service life of the first water pump group is shortened.
6. The water supply system according to claim 5, further comprising:
a second temperature sensor connected to the second water pump set and the control cabinet for detecting a water temperature of the second water pump set; and
and the second over-temperature water drainage electromagnetic valve is connected to the second water pump group and the control cabinet and is used for draining water under the condition that the second temperature sensor detects that the water temperature exceeds a preset threshold value, so that the service life of the second water pump group is prevented from being reduced due to scalding.
7. The water supply system according to claim 1, further comprising:
a first pressure sensor connected to the water outlet end of the first water pump group to measure a first water outlet pressure of the first water pump group; and
a second pressure sensor connected to the water outlet end of the second water pump set to measure a second water outlet pressure of the second water pump set,
wherein the control cabinet is also used for controlling the working power of each water pump group according to the first outlet water pressure and/or the second outlet water pressure.
8. A method for controlling a water pump set to supply water under pressure, comprising:
controlling a first water pump set connected to a municipal water supply network or a pool water tank to stack water supply with a first rich lift of the municipal water supply network;
detecting a first outlet flow rate of the supply water of the first water pump set using a first outlet flow rate sensor connected to an outlet end of the first water pump set;
controlling a second water pump set in series with the first water pump set to stack the supply water with a second rich lift of the supply water of the first water pump set;
detecting a second outlet flow rate of the supply water of the second water pump set using a second outlet flow rate sensor connected to the outlet end of the second water pump set;
controlling a third water pump set in series with the second water pump set to stack the supply water with a third rich lift of the supply water of the second water pump set;
detecting a third outlet flow rate of the supply water of the third water pump group using a third outlet flow rate sensor connected to the outlet end of the third water pump group; and
controlling different water pump configuration parameters in the first water pump group, controlling different water pump configuration parameters in the second water pump group and/or controlling different water pump configuration parameters in the third water pump group based on the detected first water outlet flow, preferentially adjusting efficiency deviation and then adjusting surplus lift deviation so as to minimize the integral extra unit power consumption value of each water pump group,
wherein, all water pump groups and the control cabinet are integrated into a set of equipment and installed in the same equipment room.
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| CN105089097A (en) * | 2015-08-03 | 2015-11-25 | 湖南沃尔特水设备有限公司 | Water supply device and method for automatically matching appropriate water pumps according to real-time flows |
| CN106896740B (en) * | 2015-12-17 | 2019-08-16 | 英业达科技有限公司 | House water resource managing and control system and its method |
| CN105840480B (en) * | 2016-05-24 | 2017-10-13 | 史仁朋 | A kind of closed level Four connection in series-parallel pumping station system and its control method |
| CN105971056A (en) * | 2016-06-28 | 2016-09-28 | 中建安装工程有限公司 | Multistage temporary water supply device and water supply method |
| CN107369105A (en) * | 2017-06-15 | 2017-11-21 | 新奥泛能网络科技股份有限公司 | Water feeding method and device based on tier building |
| CN107272617A (en) * | 2017-06-20 | 2017-10-20 | 河南华东工控技术有限公司 | A kind of reclaimed water pumping station controlling system and control method |
| CN109267608B (en) * | 2018-11-15 | 2021-05-07 | 国家电网有限公司 | Step water supply system and layered distributed control method thereof |
| CN109681400A (en) * | 2018-12-27 | 2019-04-26 | 广州通辉泵业有限公司 | It is pumped in a kind of pipe with cooling device |
| CN111021472A (en) * | 2019-12-06 | 2020-04-17 | 湖南华振供水设备有限公司 | Energy-saving method of secondary water supply system |
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| CN102418366A (en) * | 2010-09-28 | 2012-04-18 | 上海凯泉泵业（集团）有限公司 | Energy-saving water supply equipment of high-rise building |
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| CN102691334B (en) * | 2012-05-25 | 2013-12-11 | 天津大学建筑设计研究院 | Method for determining switching time between constant-pressure water supply and air-pressure water supply of joined water supply system |
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