CN110264067B - Method for calculating inlet flow of secondary water supply and storage equipment - Google Patents
Method for calculating inlet flow of secondary water supply and storage equipment Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 225
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- 230000014759 maintenance of location Effects 0.000 claims abstract description 24
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- 238000004364 calculation method Methods 0.000 claims description 24
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- 239000000460 chlorine Substances 0.000 description 10
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Abstract
The invention discloses a method for calculating the inlet flow of secondary water supply and storage equipment, which comprises the following steps: step one, calculating theoretical outlet flow of different time periods in one day according to historical data of outlet flow of a plurality of recent days; step two, calculating the theoretical water retention amount of the water storage equipment at the starting time of different time periods in one day under the condition of given retention time according to the result of the step one; and step three, calculating the inlet flow of the water storage equipment in different time periods of a day by combining the residual water quantity obtained by real-time detection according to the results of the step one and the step two. The invention aims to solve the technical problem that the residence time of tap water in water storage equipment can be quantitatively controlled, so that the risk of exceeding the standard of microorganism indexes caused by overlong residence time of the tap water in the water storage equipment is reduced to the maximum extent, the conventional equipment is slightly changed, the implementation is convenient, and the energy consumption, the maintenance cost and the operation cost in actual operation are very low.
Description
Technical Field
The invention relates to the field of secondary water supply of an urban water supply network system, in particular to a method for calculating the inlet flow of secondary water supply and storage equipment.
Background
At present, most of drinking water (commonly called tap water) in our city life is disinfected by chlorine. The chlorine disinfection method has the outstanding advantage that residual chlorine has a continuous disinfection effect, and the residual chlorine refers to the residual chlorine in water after chlorine is added and contacted for a certain time during the disinfection by the chlorine. The residual chlorine concentration can gradually decline along with the time in the urban water supply pipe network system, and the microorganisms in the tap water can be controlled within a qualified range by keeping enough residual chlorine concentration in the urban water supply pipe network system.
The secondary water supply is a water supply mode for supplying water to users or self-using water through storage, pressurization and other facilities through pipelines when the requirements of domestic and industrial building drinking water on water pressure and water quantity exceed the capacity of a public water supply network in cities and towns or a water supply network of self-built facilities. The secondary water supply facility mainly comprises a water storage device, a pressurizing device and a pipeline. Tap water stays in secondary water supply and storage equipment (hereinafter referred to as water storage equipment for short) for a period of time, and if the stay time is too long, the concentration of residual chlorine may be attenuated to a very low level, so that the effect of effectively killing microorganisms in water is not achieved, and the microorganism indexes of the tap water in the water storage equipment exceed standards. Therefore, the method has important significance for reducing the residence time of the tap water in the water storage equipment as much as possible.
Tap water in the water storage equipment is pumped by a water pump or automatically flows in from a city water supply pipe network system. The inlet flow of the water storage equipment refers to the flow of tap water at a certain moment at the inlet of the water storage equipment. The outlet flow rate of the water storage device (hereinafter referred to as outlet flow rate) refers to the flow rate of tap water at a certain time at the outlet of the water storage device, and the flow rate is determined by the water consumption condition of a user served by the water storage device. The amount of water left in the water storage equipment (hereinafter referred to as the amount of water left) refers to the total volume of tap water in the water storage equipment at a certain moment, and the amount of the water left and the outlet flow determine the retention time of the tap water in the water storage equipment. At present, the control of the residual water amount is mainly realized through a water level control valve in the water storage equipment, when the water level in the water storage equipment drops to exceed a preset value, the water level control valve is opened and starts to supply water, and when the water level rises to a preset height, the water level control valve is closed and stops supplying water. At present, people propose to adjust the water supply amount of a water pump for water storage equipment according to the actual water consumption, particularly, the water supply amount of the water pump is increased when the water consumption is large, and the water supply amount of the water pump is reduced when the water consumption is small. However, since this water supply method does not specifically consider the quantitative relationship between the amount of the remaining water and the residence time of the tap water in the water storage device, the amount of the remaining water cannot be quantitatively calculated according to the given residence time, and thus the amount of the supplied water to the water storage device cannot be quantitatively calculated according to the given residence time, and as a result, the residence time of the tap water in the water storage device cannot be quantitatively controlled, where the given residence time is a period of time artificially set to ensure the water quality safety of the tap water, and the amount of the remaining water at the beginning of the period of time completely flows out of the water storage device after the period of time. To date, how to quantitatively control the residence time of tap water in a water storage device is still an unsolved problem.
In order to solve the technical problems, the prior art with chinese patent publication No. CN105442670B discloses a building water supply pipe circulation system and method for secondary water supply water quality assurance in 2017, 9/1.s, the system includes a building water supply service pipe, a lifting or water storage device, a flow metering or detecting device, a backflow controller, a building water supply vertical pipe, a building indoor pipe and faucet, a backflow pipe, an ultraviolet/titanium dioxide sterilizer, a backflow solenoid valve, and a check valve. When the water is normally used, municipal tap water is delivered to an indoor pipeline and a faucet of the building through a building water supply service pipe, a lifting or water storage device, a flow metering or detecting device and a building water supply vertical pipe. When the hydraulic retention time of tap water for secondary water supply reaches more than 2 hours, water in the building water supply vertical pipe flows into a building water supply household inlet pipe or a water storage device again after passing through the water return pipe and the ultraviolet/titanium dioxide disinfector, and is mixed with fresh tap water and then supplied to a user by the secondary water supply system again, so that the biological safety and the chemical safety of the tap water in the secondary water supply system are guaranteed. However, in the actual use process, the treatment method still cannot quantitatively control the residence time of the tap water in the water storage equipment, and the conventional equipment is greatly modified, so that the energy consumption, the maintenance cost and the operation cost are extremely high.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a method for calculating the inlet flow of secondary water supply and storage equipment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for calculating the inlet flow of secondary water supply and storage equipment is characterized by comprising the following steps:
step one, calculating theoretical outlet flow of different time periods in one day according to historical data of outlet flow of a plurality of recent days;
step two, calculating the theoretical water retention amount of the water storage equipment at the starting time of different time periods in one day under the condition of given retention time according to the result of the step one;
and step three, according to the results of the step one and the step two, combining the residual water quantity obtained by real-time detection, calculating the inlet flow of the water storage equipment in the time period at the starting moment of each time period in one day, and calculating the inlet flow of the water storage equipment in different time periods in one day.
The calculation method of the step one is as follows: dividing one day into N time periods averagely, using i to represent the sequence number of different time periods in one day, and using the outlet flow detected in the past continuous E days to calculate, then:
wherein, in the formula (1)
Representing the detected outlet flow, d representing the sequential number of a period of consecutive dates, d/i representing the period of i with the date d, referred to as d/i period, c representing the sequential number of outlet flows measured during d/i period, Ad/iRepresenting the total number of outlet flows measured during the d/i period,
represents the arithmetic mean of all the detected outlet flows in the d/i time period; in the formula (2)
The theoretical outlet flow of the i time period obtained by calculation is represented, and is obtained by calculating all the I time periods for continuous E days
Is calculated as the average of the counts.
The calculation method of the second step is as follows: using M to represent the total time length of a day, dividing the day into N time sections on average, using M/N to represent the time length of each time section, using i to represent the sequence number of different time sections in the day, then:
m in formula (5)iCalculated by the formula (6) below:
wherein, W in the formula (3)1The lowest water storage quantity of the water storage equipment is shown, and beta is a set lowest water quantity coefficientThe average value of the total daily outflow water of the water storage equipment is calculated according to historical data;
in the formula (4)Representing n consecutive from the time period iiThe sum of the maximum water flow of the water storage equipment in each time period is set to ensure that tap water in the water storage equipment can at least meet the requirement of n used by a useriA period of time(ii) a mod is the remainder operator; ((i + a-2) mod N +1) represents a period (i + a-1) in such a manner as to satisfy the requirement that the period expression (i + a-1) cannot exceed the total number N of periods;
means that all of them are in the same time period (i + a-1)Maximum value of (1);
in the formula (5)
Representing m successive from time period iiThe sum of theoretical outflow water of water storage equipment in each time period;
t in formula (6)iRepresents a given dwell time at the start of the i period;
w in formula (7)a/iAnd the theoretical water retention amount of the water storage equipment at the starting moment of the time period i under the condition of given residence time is obtained through calculation, and max { } is an operator for solving the maximum value.
The calculation method of the third step is as follows: setting the residual water quantity of the water storage equipment at the beginning time of the time period i, which is obtained by real-time detection, as Wb/iAnd then:
in the formula (8)
Denotes the inlet flow, W, of the water storage facility during time period ia/(i mod N+1)For the calculated theoretical water retention amount of the water storage equipment at the starting time of the (i +1) time period, (i +1) is represented by (i mod N +1) in order to meet the requirement that the time period expression (i +1) cannot exceed the total number N of the time periods.
In the first step, theoretical outlet flow at different time periods of a day is calculated according to historical data of outlet flow of the last 20-40 days.
The invention has the advantages that:
the invention realizes the quantitative calculation of the residual water quantity according to the given retention time by finding the quantitative relation between the residual water quantity and the retention time of the tap water in the water storage equipment, then calculates the inlet flow according to the calculated residual water quantity, and supplies water to the water storage equipment according to the calculated inlet flow, thereby realizing the quantitative control of the retention time of the tap water in the water storage equipment, furthest reducing the risk of microorganism index standard exceeding caused by overlong retention time of the tap water in the water storage equipment, simultaneously having small change on the prior equipment, being convenient to implement, and having very low energy consumption, maintenance cost and operation cost in actual operation.
Drawings
FIG. 1 is a flow chart of the operation of the present invention.
Fig. 2 is a graph showing the variation of the theoretical outlet flow rate in different time periods of the day in the first step of the present invention.
Fig. 3 is a graph showing the variation of the theoretical retained water amount in step two of the present invention at different time periods of the day.
Detailed Description
Example 1
The embodiment provides a method for calculating the inlet flow of secondary water supply and storage equipment, which comprises the following steps:
step one, theoretical outlet flow of different time periods in one day is calculated according to historical data of outlet flow of a plurality of recent days, and specifically, the theoretical outlet flow of different time periods in one day can be calculated according to historical data of outlet flow of 20-40 days in the recent days.
The specific calculation method in the step is as follows: dividing one day into N time periods averagely, using i to represent the sequence number of different time periods in one day, and using the outlet flow detected in the past continuous E days to calculate, then:
wherein, in the formula (1)
Representing the detected outlet flow, d representing the sequential number of a period of consecutive dates, d/i representing the period of i with the date d, referred to as d/i period, c representing the sequential number of outlet flows measured during d/i period, Ad/iRepresenting the total number of outlet flows measured during the d/i period,
represents the arithmetic mean of all the detected outlet flows in the d/i time period; in the formula (2)
The theoretical outlet flow of the i time period obtained by calculation is represented, and is obtained by calculating all the I time periods for continuous E daysThe arithmetic mean value of the flow rate reflects the change rule of the outlet flow rate in different time periods in one day.
And step two, calculating the theoretical water retention amount of the water storage equipment at the starting time of different time periods in one day under the condition of given retention time according to the result of the step one.
The specific calculation method in the step is as follows: m represents the total time length of a day, the day is divided into N time sections on average, M/N represents the time length of each time section, i represents the sequence number of different time sections in the day,
andas before, then:
m in formula (5)iCalculated by the formula (6) below:
wherein, W in the formula (3)1The minimum water storage quantity of the water storage equipment is represented, the parameter is set to ensure the water requirement of a user base, beta is a set minimum water quantity coefficient,the average value of the total daily water outflow of the water storage equipment is calculated according to historical data.
In the formula (4)Representing n consecutive from the time period iiThe sum of the maximum water flow of the water storage equipment in each time period is set to ensure that tap water in the water storage equipment can at least meet the requirement of n used by a useriA time period; mod is the remainder operator; ((i + a-2) mod N +1) represents a period (i + a-1) in such a manner as to satisfy the requirement that the period expression (i + a-1) cannot exceed the total number N of periods;means that all of them are in the same time period (i + a-1)
Maximum value of (2).
In the formula (5)
Representing m successive from time period iiAnd the theoretical outflow water quantity of the water storage equipment in each time period is calculated according to the theoretical outlet flow of the same time period.
T in formula (6)iThe given retention time of the starting time of the time period i is represented, the given retention time refers to a period of time length artificially given for ensuring the water quality safety, the starting time of the period of time is the starting time of the time period i, the retained water quantity at the starting time of the time period i completely flows out of the water storage equipment after the period of time, the given retention time is a key parameter for realizing quantitative calculation of the retained water quantity, the retained water quantity is determined according to the given retention time, the tap water in the water storage equipment can be ensured to completely flow out of the water storage equipment within the normal variation range of the given retention time, and T is set for convenient calculationiIs an integer multiple of the time period duration.
W in formula (7)a/iThe theoretical residual water quantity of the water storage device at the starting time of the time period i under the condition of a given retention time is obtained through calculation, and the theoretical residual water quantity is used for distinguishing the actual detected residual water quantity and particularly refers to the residual water quantity obtained through calculation; max { } is the operator for maximum value.
And step three, according to the results of the step one and the step two, combining the residual water quantity obtained by real-time detection, calculating the inlet flow of the water storage equipment in the time period at the starting moment of each time period in one day, and calculating the inlet flow of the water storage equipment in different time periods in one day. And water is supplied according to the obtained inlet flow, so that the quantitative control of the residence time of the tap water in the water storage equipment can be realized.
The specific calculation method in the step is as follows: m represents the total time length of a day, the day is divided into N time sections on average, M/N represents the time length of each time section, i represents the sequence number of different time sections in the day,
and
setting the water storage device with the water storage device water storage amount W obtained by real-time detection at the beginning time of the time period ib/iAnd then:
in the formula (8)
Denotes the inlet flow, W, of the water storage facility during time period ia/(i mod N+1)For the calculated theoretical water retention amount of the water storage equipment at the starting time of the (i +1) time period, (i +1) is represented by (i mod N +1) in order to meet the requirement that the time period expression (i +1) cannot exceed the total number N of the time periods.
The method for calculating the inlet flow of the secondary water supply and storage equipment is suitable for water supply of the low-level water tank, water supply of the high-level water tank and combined water supply of the low-level water tank and the high-level water tank.
Example 2
On the basis of embodiment 1, this embodiment is further described with reference to specific data, and the method for calculating the inlet flow rate of the secondary water supply and storage equipment includes the following steps:
step one, evenly dividing a day into 24 time periods, using i to represent the sequence number of different time periods in the day, preferably using outlet flow detected in the past 30 consecutive days for calculation, then:
wherein, in the formula (1)
The outlet flow obtained by detection is detected in real time through a flow meter arranged at the outlet of the water storage equipment, and data is acquired every minute with the unit of m3Where d denotes the number of successive days, d/i denotes the time period i of day d, referred to as the d/i time period, c denotes the number of outlet flows measured in the d/i time period, preferably the total number of outlet flows measured per time period is 60,
represents the arithmetic mean of all the detected outlet flows in the d/i time period and has the unit of m3H; in the formula (2)
The theoretical outlet flow of the calculated i time period is all calculated in the i time period for 30 daysIs an arithmetic mean of (d) in m3And h, reflecting the change rule of the outlet flow in different time periods in one day, and the calculation result is shown in figure 2.
Step two, the total time length of one day is 24h, the one day is averagely divided into 24 time periods, the time length of each time period is 1h, the sequence number of different time periods in one day is represented by i,
and
as before, then:
wherein, W in the formula (3)1To representThe lowest water storage quantity of the water storage equipment is m3The parameter is set to ensure the most basic water demand of the user, for example, the minimum water quantity coefficient is set to be 0.07, and the average value of the total daily outflow water quantity of the water storage equipment calculated according to the historical data is 121m3(ii) a In the formula (4)
The sum of the maximum values of the water outflow quantity of the water storage equipment in 2 continuous time periods from the time period i is represented, and the running water in the water storage equipment can at least meet the requirement of a user for using 2 time periods; mod is the remainder operator; ((i + a-2) mod 24+1) represents a period (i + a-1) in such a manner as to satisfy the requirement that the period expression (i + a-1) cannot exceed the total number of periods 24;denotes all in the same time period ((i + a-2) mod 24+1)
Maximum value of (2).
Wherein the value 3 is calculated by the following formula:
mi＝3/1＝3 (6)
in the formula (5)
The theoretical outflow water quantity is the sum of the theoretical outflow water quantities of the water storage equipment in 3 continuous time periods starting from the time period i, and the theoretical outflow water quantity is calculated according to the theoretical outlet flow quantity of the same time period; setting the given retention time to be 3h in the formula (6), wherein the given retention time refers to a period of time artificially given for ensuring the water quality safety, the starting time of the period of time is the starting time of the time period i, the residual water quantity at the starting time of the time period i completely flows out of the water storage equipment after the period of time, and the given retention time is a time for realizing quantitative calculation of the residual water quantityThe key parameter determines the residual water quantity according to the given retention time, so that the tap water in the water storage equipment can be ensured to completely flow out of the water storage equipment within the normal variation range of the given retention time.
W in formula (7)a/iThe theoretical residual water quantity of the water storage equipment at the starting time of the time period i under the condition that the given retention time is 3h is obtained through calculation, wherein the theoretical residual water quantity is used for distinguishing the residual water quantity obtained through actual detection and particularly refers to the residual water quantity obtained through calculation; max { } is the operator for maximum value.
The following table is the calculated day W1、
And Wa/iAs a result, the shaded area indicates that the area value is taken as:
step three, the total time length of one day is 24h, the day is averagely divided into 24 time periods, the time length of each time period is 1h, and the sequential number of different time periods in the day, mod and
as before, then:
in the formula (8)
The calculated inlet flow of the water storage equipment in the time period i is shown, and the unit is m3/h；Wb/iThe residual water quantity of the water storage equipment at the starting moment of the time period i is detected in real time and is detected by the water storage equipmentThe water quantity detection equipment installed in the spare equipment detects in real time and the unit is m3；Wa/(i mod 24+1)For the calculated theoretical water retention amount of the water storage equipment at the starting time of the (i +1) time period, (i +1) is represented by (i mod 24+1) in order to meet the requirement that the time period expression (i +1) cannot exceed the total time period number 24, and the unit is m3. The following table shows the inlet flow rates calculated for different time periods on a certain day in this example:
| time period | Inlet flow (m)3/h) |
| 1 | 2.1 |
| 2 | 1.3 |
| 3 | 1.6 |
| 4 | 6.9 |
| 5 | 7.6 |
| 6 | 7.8 |
| 7 | 6.9 |
| 8 | 5.5 |
| 9 | 5.8 |
| 10 | 5.9 |
| 11 | 3.3 |
| 12 | 2.1 |
| 13 | 3.2 |
| 14 | 3.6 |
| 15 | 7.7 |
| 16 | 9.1 |
| 17 | 8.4 |
| 18 | 7.6 |
| 19 | 7.7 |
| 20 | 4.9 |
| 21 | 2 |
| 22 | 1.1 |
| 23 | 1.4 |
| 24 | 2 |
And D, supplying water to the water storage equipment according to the inlet flow of different time periods in one day obtained in the step three, namely controlling the retention time of tap water in the water storage equipment in a fixed amount, so that the risk of exceeding the standard of microorganism indexes caused by overlong retention time of the tap water in the water storage equipment is reduced to the maximum extent, the conventional equipment is changed little, the implementation is convenient, and the energy consumption, the maintenance cost and the operation cost in actual operation are very low.
Claims (3)
1. A method for calculating the inlet flow of secondary water supply and storage equipment is characterized by comprising the following steps:
step one, calculating theoretical outlet flow of different time periods in one day according to historical data of outlet flow of a plurality of recent days;
step two, calculating the theoretical water retention amount of the water storage equipment at the starting time of different time periods in one day under the condition of given retention time according to the result of the step one;
step three, according to the results of the step one and the step two, combining the residual water quantity obtained by real-time detection, calculating the inlet flow of the water storage equipment in the time period at the starting moment of each time period in one day, and calculating the inlet flow of the water storage equipment in different time periods in one day according to the inlet flow of the water storage equipment;
the calculation method of the step one is as follows: dividing one day into N time periods averagely, using i to represent the sequence number of different time periods in one day, and using the outlet flow detected in the past continuous E days to calculate, then:
wherein, in the formula (1)
Representing the detected outlet flow, d representing the sequential number of a period of consecutive dates, d/i representing the period of i with the date d, referred to as d/i period, c representing the sequential number of outlet flows measured during d/i period, Ad/iRepresenting the total number of outlet flows measured during the d/i period,
represents the arithmetic mean of all the detected outlet flows in the d/i time period; in the formula (2)
The theoretical outlet flow of the i time period obtained by calculation is represented, and is obtained by calculating all the I time periods for continuous E days
The arithmetic mean of (a);
the calculation method of the second step is as follows: using M to represent the total time length of a day, dividing the day into N time sections on average, using M/N to represent the time length of each time section, using i to represent the sequence number of different time sections in the day, then:
m in formula (5)iCalculated by the formula (6) below:
wherein, W in the formula (3)1The lowest water storage quantity of the water storage equipment is shown, beta is a set lowest water quantity coefficient,
the average value of the total daily outflow water of the water storage equipment is calculated according to historical data;
in the formula (4)
Representing n consecutive from the time period iiThe sum of the maximum water outflow amount of the water storage equipment in each time period; mod is the remainder operator; ((i + a-2) mod N +1) represents a period (i + a-1) in such a manner as to satisfy the requirement that the period expression (i + a-1) cannot exceed the total number N of periods;
means that all of them are in the same time period (i + a-1)
Maximum value of (1);
in the formula (5)
Representing m successive from time period iiThe sum of theoretical outflow water of water storage equipment in each time period;
t in formula (6)iIndicating the start of the i periodA given dwell time at a time;
w in formula (7)a/iAnd the theoretical water retention amount of the water storage equipment at the starting moment of the time period i under the condition of given residence time is obtained through calculation, and max { } is an operator for solving the maximum value.
2. The method for calculating the inlet flow of the secondary water supply and storage equipment as claimed in claim 1, wherein the method comprises the following steps: the calculation method of the third step is as follows: setting the residual water quantity of the water storage equipment at the beginning time of the time period i, which is obtained by real-time detection, as Wb/iAnd then:
in the formula (8)
Denotes the inlet flow, W, of the water storage facility during time period ia/(i mod N+1)For the calculated theoretical water retention amount of the water storage equipment at the starting time of the (i +1) time period, (i +1) is represented by (i mod N +1) in order to meet the requirement that the time period expression (i +1) cannot exceed the total number N of the time periods.
3. The method for calculating the inlet flow of the secondary water supply and storage equipment as claimed in claim 1 or 2, wherein the method comprises the following steps: in the first step, theoretical outlet flow rates at different time periods of a day are calculated according to historical data of the outlet flow rates of the last 20-40 days.
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| CN113628062B (en) * | 2020-05-06 | 2023-06-30 | 重庆昕晟环保科技有限公司 | Method for quantitatively supplying water to secondary water supply tank based on actual reserve water quantity |
| CN113628061B (en) * | 2020-05-06 | 2023-06-30 | 重庆昕晟环保科技有限公司 | Water supply method for volume-variable water tank based on actual reserve water volume |
| CN113628063B (en) * | 2020-05-06 | 2023-06-30 | 重庆昕晟环保科技有限公司 | Water supply method of combined secondary water supply tank based on actual reserve water quantity |
| CN112580969B (en) * | 2020-12-15 | 2021-07-16 | 重庆昕晟环保科技有限公司 | Method for calculating theoretical inflow water quantity of secondary water supply tank |
| CN112667953B (en) * | 2020-12-15 | 2023-07-07 | 重庆昕晟环保科技有限公司 | Combined water supply method for secondary water supply high-level water tank and low-level water tank |
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