CN113340360B - Secondary network system balance flow measurement method - Google Patents
Secondary network system balance flow measurement method Download PDFInfo
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- CN113340360B CN113340360B CN202110602912.6A CN202110602912A CN113340360B CN 113340360 B CN113340360 B CN 113340360B CN 202110602912 A CN202110602912 A CN 202110602912A CN 113340360 B CN113340360 B CN 113340360B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
Abstract
The invention discloses a balance flow measurement method of a secondary network system, which comprises the steps that the secondary network system comprises at least one flow measurement device, a unit balance valve and a differential pressure measurement device arranged at least one end of the unit balance valve; the specific steps in the measurement are as follows: acquiring flow data of a secondary network system in real time; calculating the obtained flow data according to a unit calculation flow formula to obtain any unit calculation flow; and correcting the calculated flow of any unit by using a total flow correction formula of the secondary network system. The invention arranges a flow metering device in the secondary network system and arranges a differential pressure measuring device on the unit balance valve. And simultaneously acquiring related flow data in real time, obtaining any unit calculation flow through a unit calculation flow formula, and correcting the result. Therefore, the problem that the flow error is large by pressure difference estimation in the existing scheme or the problem of cost increase and unfavorable management caused by adding flow metering equipment is solved.
Description
Technical Field
The invention relates to the technical field of heat supply, in particular to a secondary network system balance flow measurement method.
Background
At present, a unit balance valve is generally adopted in a secondary network system as a regulating valve for balancing two networks, but the actual pipeline flow cannot be measured by the valve, and a set of flow metering equipment needs to be added in each unit, so that the heat supply cost is increased. Two existing schemes are adopted, firstly, pressure measuring equipment is additionally arranged at two ends of each unit balance valve, and the flow passing through a pipeline is calculated according to pressure difference. And the second scheme is that flow metering equipment is added at the rear end of each unit balance valve to measure and calculate the pipeline flow.
The two existing technical schemes have the defects that the first scheme has the defects that the flow calculation precision is determined by the measurement precision of the pressure difference, when the opening degree of the valve is small, the pressure difference is large, the pressure difference measurement is accurate, the calculated flow accuracy is high, when the opening degree is large, the pressure difference of the valve is small, the pressure difference measurement error is large, and the calculated flow accuracy is low; the second scheme has the defects that the flow metering equipment is added in the unit to accurately meter the pipeline flow, but the more the units are, the more the required metering equipment is, and the higher the cost is.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and adopts a secondary network system balance flow measurement method to solve the problems in the background technology.
A secondary network system balance flow measurement method comprises the steps that the secondary network system comprises at least one flow metering device, a unit balance valve and a differential pressure measurement device arranged at least one end of the unit balance valve;
the specific steps in the measurement are as follows:
acquiring flow data of a secondary network system in real time;
calculating the obtained flow data according to a unit calculation flow formula to obtain any unit calculation flow;
and correcting the calculated flow of any unit by using a total flow correction formula of the secondary network system.
As a further aspect of the invention: the specific steps of calculating the obtained flow data according to the unit calculation flow formula to obtain the calculated flow of any unit include:
measuring the pressure difference between two ends of the balance valves of all the user units through a pressure difference measuring device to obtain the pressure difference data of any user unit;
calculating the unit calculation flow of each user unit according to a unit calculation flow formula and the pressure difference data of any user unit;
the unit calculation flow formula is as follows:
in the formula, Q i Calculating the flow for the unit of the ith unit, K v Is the flow coefficient of the unit valve, Δ P i Is the two ends of the unit balance valve of the ith unitThe pressure difference, ρ, is the media density.
As a further scheme of the invention: the specific steps of correcting the calculated flow of any unit obtained by using the total flow correction formula of the secondary network system comprise:
calculating the flow through any unit obtained by calculating the acquired flow data;
substituting the calculated flow of any unit into a total flow correction formula to correct data;
the total flow correction formula is as follows:
in the formula, Q Repair the Is the corrected flow of the i-th unit, Q i Calculating the flow for the unit of the ith unit, N being the total number of units, Q General assembly Is the total flow of the secondary net system.
Compared with the prior art, the invention has the following technical effects:
by adopting the technical scheme, the flow metering device is arranged in the secondary network system, and the differential pressure measuring device is arranged on the unit balance valve. And simultaneously, acquiring related flow data in real time, obtaining the calculated flow of any unit through a unit calculated flow formula, and correcting the calculated flow result of any unit. Therefore, the problem that in the existing scheme, the flow error obtained through calculation of the pressure difference data obtained by the pressure difference measuring equipment is large, or the problem that the cost is increased due to the fact that the flow metering equipment is additionally arranged on all user units for measurement is solved.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
fig. 1 is a schematic step diagram of a secondary network system balanced flow measurement method in accordance with some embodiments disclosed herein.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a secondary network system balance flow measurement method includes:
setting the secondary network system to comprise at least one flow metering device, a unit balance valve and a differential pressure measuring device arranged at least one end of the unit balance valve;
the specific steps in the measurement are as follows:
s1, acquiring flow data of a secondary network system in real time;
s2, calculating the obtained flow data according to a unit calculation flow formula to obtain any unit calculation flow; the method comprises the following specific steps:
measuring the pressure difference between two ends of the balance valves of all the user units through a pressure difference measuring device to obtain the pressure difference data of any user unit;
calculating the unit calculation flow of each user unit according to a unit calculation flow formula and the pressure difference data of any user unit;
in a specific embodiment, the secondary network system is provided with N units, wherein each unit is provided with a unit balance valve, a flow metering device is installed at a heat supply inlet of the secondary network system, and a differential pressure measuring device is arranged at two ends of each unit balance valve and used for measuring differential pressure change of the unit balance valves in the adjusting process.
The unit calculation flow formula is as follows:
in the formula, Q i Calculating the flow rate for the unit of the i-th unit, K v Is the flow coefficient of the unit valve, Δ P i The pressure difference between two ends of the unit balance valve of the unit i is rho, and the rho is the density of the medium.
And S3, correcting the calculated flow of any unit by using a total flow correction formula of the secondary network system. The method comprises the following specific steps:
calculating the flow through any unit obtained by calculating the acquired flow data;
substituting the calculated flow of any unit into a total flow correction formula to correct data;
in a specific embodiment, due to the fact that data errors exist in differential pressure measurement, cell calculation flow correction is carried out through a correction formula. Set Q 1 ，Q 2 ，…，Q N Calculating flow, Q, for N units General (1) For the total flow at the inlet of the secondary grid system, there is a unit 1 to correct the flow Q Trimming 1 The actual flow at cell 1 is obtained by correction with the following correction formula.
The total flow correction formula is as follows:
in the formula, Q Repair the Corrected flow for the i-th unit, Q i Calculating the flow for the unit of the ith unit, N being the total number of units, Q General assembly Is the total flow of the secondary net system.
In the specific embodiment, the total flow of the secondary network system is assumed to be 100m 3 H, three unit pipelines are arranged in the system, and the unit flow obtained by calculation is respectively 35m 3 /h、40m 3 /h，30m 3 H, then the total flow is calculated to be 105m 3 H, the corrected unit flow rates can be respectively 33.3m through the correction formula 3 /h，38.1m 3 H and 28.6m 3 /h。
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents, which should be construed as being within the scope of the invention.
Claims (1)
1. The secondary network system balance flow measurement method is characterized in that the secondary network system comprises at least one flow metering device, a unit balance valve and a differential pressure measurement device arranged at least one end of the unit balance valve;
the specific steps in the measurement are as follows:
acquiring flow data of a secondary network system in real time;
calculating the obtained flow data according to a unit calculation flow formula to obtain any unit calculation flow, and specifically comprising the following steps of:
measuring the pressure difference between two ends of the balance valves of all the user units through a pressure difference measuring device to obtain the pressure difference data of any user unit;
calculating the unit calculation flow of each user unit according to a unit calculation flow formula and the pressure difference data of any user unit;
the unit calculation flow formula is:
in the formula, Q i Calculating the flow rate for the unit of the i-th unit, K v Is the flow coefficient of the unit valve, Δ P i The pressure difference between two ends of a unit balance valve of the ith unit is rho, and the rho is the density of a medium;
correcting the calculated flow of any unit by using a total flow correction formula of the secondary network system, wherein the method specifically comprises the following steps:
calculating the flow through any unit obtained by calculating the acquired flow data;
substituting the calculated flow of any unit into a total flow correction formula to correct data;
the total flow correction formula is as follows:
in the formula, Q Repair the Is the corrected flow of the i-th unit, Q i Calculating the flow for the unit of the ith unit, N being the total number of units, Q General (1) Is the total flow of the secondary net system.
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| WO2012093436A1 (en) * | 2011-01-06 | 2012-07-12 | 株式会社フジキン | Flow rate measurement device and flow rate measurement method of flow rate controller for gas feeder |
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| CN100425954C (en) * | 2006-11-24 | 2008-10-15 | 浙江大学 | A differential pressure type flow measuring method and flow apparatus thereof |
| CN101290252B (en) * | 2007-04-16 | 2010-09-08 | 北京众力德邦智能机电科技有限公司 | User heating caloric metering system |
| CN102661425B (en) * | 2012-03-15 | 2014-06-11 | 沈居富 | Balance valve adjuster, intelligent balance valve adjusting system composed of the same, and method |
| CN103471661B (en) * | 2013-08-12 | 2016-05-11 | 朱海龙 | Balance valve flow detection method and system |
| CN104864151A (en) * | 2015-05-19 | 2015-08-26 | 西安恒隆电气有限公司 | Internet of Things balance valve and control method thereof |
| JP7085997B2 (en) * | 2016-09-12 | 2022-06-17 | 株式会社堀場エステック | Flow rate control device, program for flow rate control device, and flow rate ratio control method |
| CN109495343B (en) * | 2018-11-20 | 2021-04-02 | 网宿科技股份有限公司 | Abnormal flow data processing method and device and server |
| CN112556798B (en) * | 2019-09-26 | 2024-01-26 | 深圳电蚂蚁数据技术有限公司 | Flow measurement system and error verification method convenient for error verification |
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| WO2012093436A1 (en) * | 2011-01-06 | 2012-07-12 | 株式会社フジキン | Flow rate measurement device and flow rate measurement method of flow rate controller for gas feeder |
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| Comparative Analysis of Water Pipeline Network Using Flow Rate Corrections;NB Nduka;《International Journal of Science, Engineering and Technology Research》;20160630;全文 * |
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