CN111396985A - Automatic regulating system for static hydraulic balance of centralized heat supply pipe network and implementation method - Google Patents
Automatic regulating system for static hydraulic balance of centralized heat supply pipe network and implementation method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
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- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F24D2220/00—Components of central heating installations excluding heat sources
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Abstract
The invention discloses a static hydraulic balance automatic regulating system and a realizing method for a centralized heat supply pipe network, which are used for regulating the opening of a valve to enable the impedance of each user branch to reach the impedance required by the balance of the pipe network on the basis of respectively determining the impedance value of each branch before the balance of the pipe network and the impedance value of each branch after the balance is finished from the viewpoint of analyzing the overall hydraulic working condition of the pipe network. The method for solving the overall hydraulic parameters based on the pipe network is convenient for realizing computer programming calculation, thereby being convenient for realizing the intellectualization of the static balance process; the adoption of the multi-gear regulating valve based on the corresponding relation of the impedance and the gear of the regulating valve is beneficial to realizing the automation of the static hydraulic balance regulating process.
Description
Technical Field
The invention relates to the field of central heating, in particular to the field of hydraulic balance of a central heating system.
Background
The hydraulic imbalance of the central heating pipe network comprises two conditions of static hydraulic imbalance and dynamic hydraulic imbalance. The static hydraulic imbalance is the phenomenon that the impedance of each user branch is not matched with the qualification pressure thereof, so that the user flow is not matched with the load; the dynamic hydraulic imbalance is a phenomenon that the flow of other users is changed due to the local adjustment of certain user branch circuits or main pipe pipelines, and the flow of other users is not matched with the load of the other users. Both of these maladjustment phenomena are common in central heating systems.
The static balance adjustment is balance adjustment aiming at the phenomenon of static hydraulic imbalance, and the adjustment means and purpose of the static balance adjustment are that the flow proportion relation of each user under any operation working condition is approximately equal to the flow proportion relation under the design working condition by adjusting the opening of a balance adjusting valve of each user branch; the dynamic balance adjustment is balance adjustment for dynamic hydraulic imbalance, and the adjustment means and purpose are to automatically adjust the opening of the valve by using automatic control equipment (such as an automatic adjusting valve with the opening controlled by the return water temperature) according to the variation condition of the operation parameters of each user, so that the flow of each user is always consistent with the load of the user. In the adjustment of the hydraulic balance of the district heating system, both the above-described hydraulic balance measures are indispensable.
At present, in the hydraulic balance adjustment of a centralized heat supply pipe network, a static balance adjusting device is not arranged or static balance adjustment is not carried out, and the condition that hydraulic balance of the pipe network is carried out only through a dynamic balance device is very common. In this case, the heating system will typically have the following conditions: a user at the near end of the heat source usually has overlarge asset pressure, the dynamic balance valve is usually in a smaller opening state, the valve core is usually seriously eroded due to overlarge flow rate, and even the valve core is frequently changed between a minimum regulation opening state and a closing state, so that the dynamic balance system is damaged due to fatigue; and the heat source far-end user may not meet the flow requirement even if the dynamic balance adjusting system is always in the maximum opening state due to the fact that the resource pressure of the heat source far-end user is too low, and therefore the dynamic balance adjusting system fails. Therefore, in the hydraulic balance of the heating system, the static hydraulic balance is the basis for realizing the hydraulic balance of the pipe network and ensuring the safety and the reliability of the system. For heating systems with serious static hydraulic imbalance, a static balance adjusting system must be arranged and a pipe network must be subjected to static balance adjustment.
The traditional heat supply pipe network static hydraulic balance adjusting method has various methods, such as a resistance coefficient method, a predetermined plan method, a proportion method, a compensation method, a computer method, a simulation analysis method, a simulation resistance method, a simple adjusting valve and the like. The methods have a common characteristic that the flow of each static regulating valve needs to be repeatedly measured by manual means on the basis of calculating and determining the regulated flow of each user one by one, and the opening of each static regulating valve needs to be repeatedly adjusted. Therefore, the traditional static hydraulic balance adjusting method is almost provided for the manual adjusting process, and is difficult to adapt to the intelligent and automatic requirements of the static hydraulic balance.
The intelligent heat supply concept that is advocated at present has greatly put forward higher demands on the intellectuality, the automation of the operation management of heating system. The traditional static balance method based on manual process can not meet the intelligent and automatic requirements of the static balance process of the intelligent heating system. In view of this, this patent proposes an impedance-based static hydraulic balance automatic adjustment system.
Disclosure of Invention
In order to realize the intellectualization and automation of the operation regulation of the central heating system, the invention provides a static hydraulic balance automatic regulation system which is based on impedance, is not limited by working conditions and is convenient to realize the automation of a computer intelligent algorithm and a static balance regulation process.
The invention also provides a method for determining the position water heads of all pressure measuring points on the pipe network main pipe of the regulating system and an implementation method of the automatic static hydraulic balance regulating system.
The system and the method are characterized in that a centralized control platform is arranged in a heat source or a heat exchange station; the centralized control platform is provided with static hydraulic balance software developed according to the method; a pressure sensor for remotely measuring the pressure of the pipe network and a remote transmission device for pressure signals are arranged at a proper position of the centralized heat supply pipe network; a multi-gear static balance adjusting valve for impedance compensation is arranged on each user branch of the centralized heat supply pipe network; and pressure sensors and corresponding pressure signal transmission devices for determining the flow of the user branch are arranged at the front and the back of the regulating valve.
In order to achieve the purpose, the invention adopts the technical scheme that:
an automatic regulating system for the static hydraulic balance of a centralized heat supply pipe network is characterized in that a centralized control platform provided with static hydraulic balance software is arranged in a heat source or a heat exchange station of a heat supply system; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged on a water supply main pipe and a water return main pipe of a heat source or a heat exchange station; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged at the downstream side of each user branch node of the water supply and return main pipe; a multi-gear static balance regulating valve is respectively arranged on each user branch pipeline, and a pressure sensor and a corresponding pressure signal conversion and remote transmission device are arranged in front of and behind the valve.
The invention provides a method for determining the position water head of each pressure measuring point on a pipe network main pipe based on the automatic regulation control system, which comprises the following specific processes:
the first step is as follows: constructing virtual circuits
Between two pressure measuring points of a main water supply and return pipe, a pipeline connecting the two measuring points is supposed to exist, a circulating water pump is supposed to be installed on the pipeline, and the lift of the circulating water pump is equal to the head difference of the pressure measuring pipes between the two measuring points, namely delta P2n，1＝(P1-P2n)+(H1-H2n) The flow rate is equal to the total flow rate of the pipe network. Each user branch can form a virtual loop with the virtual pipeline and the main pipe sections between the virtual pipeline and the virtual pipeline; in the above formula, the first and second carbon atoms are,
ΔP2n，1representing a virtual circulating water pump lift, Pa;
P1representing the measured value of the static pressure of the pressure measuring point of the water supply main pipe, Pa;
P2nrepresenting a static pressure actual measurement value Pa of a pressure measurement point of a backwater main pipe;
H1shows the water head of the pressure measuring point position of the water supply main pipe, mH2o；
H2nShows the water head of the pressure measuring point position of the total main return pipe, mH2o；
ρ represents the density of water, kg/m3；
g represents the gravity acceleration, and 9.8N/kg is taken;
the second step is that: if the heat supply system has N users, the number of the pressure measuring points on the main pipe is 2N (including two pressure measuring points on the total main pipe for supplying and returning water), the number of the position water heads of the pressure measuring points to be solved is 2N, and the 2N quantities to be solved can be obtained by using an equation set established according to the following method:
2.1: firstly, regulating a static balance regulating valve of a branch circuit (generally, the endmost user) of the most unfavorable user to a highest flow gear, and enabling a heat supply system to be in a certain stable operation state, namely a first operation working condition, so that the static pressure of each measuring point in the first operation working condition can be measured; calculating formula delta P according to resistance loss of each pipe sectioni,j＝(Pi-Pj)+(Hi-Hj) ρ g and kirchhoff's second law expression, Δ P2n，1＝∑ΔPi，jSubstituting the static pressure values of the pressure measuring points under the first working condition into the relational expression to list N linearly independent virtual loop pressure equations under the first operating condition;
the meaning of each letter in the formula is:
ΔP2n，1representing a virtual circulating water pump lift, Pa;
ΔPi，jrepresenting the resistance loss, Pa, between adjacent pressure measuring points on the main pipe section of each virtual circulation loop;
Pirepresenting the actual measured value, Pa, of the static pressure of the upstream pressure measuring point in the adjacent pressure measuring points on the main pipe section of each virtual circulation loop;
Pjrepresenting the actual static pressure measured value, Pa, of a downstream pressure measuring point in adjacent pressure measuring points on the main pipe section of each virtual circulation loop;
Hirepresents the water head, mH, of the upstream pressure measuring point in the adjacent pressure measuring points on the main pipe section of each virtual circulation loop2o；
HjRepresents the water head, mH, of the downstream pressure measuring point in the adjacent pressure measuring points on the main pipe section of each virtual circulation loop2o；
ρ represents the density of water, kg/m3；
g represents the gravity acceleration, and 9.8N/kg is taken;
2.2: the static balance regulating valve of the least favorable user branch is still kept at the highest flow gear, the static flow regulating valves of one or a plurality of user branches are regulated, the hydraulic working condition of the system is obviously changed and is in a stable running state, which is called as a second running working condition, the static pressure of each measuring point under the second running working condition (called as) can be measured, and N linear irrelevant virtual loop pressure equations under the second running working condition are listed by adopting the method same as the first running working condition;
2.3: solving the equation set containing 2N linearly independent equations obtained from the first and second operating conditions to obtain the position water head H of 2N pressure measuring points on the main pipei(i＝1，2N)。
On the basis of the control system and the method for determining the position water head of each pressure measuring point on the pipe network main pipe, the working principle of the control system is as follows:
under a certain operation condition of a centralized heating system, measuring the pressure of each measuring point by pressure sensors arranged at proper positions of each pipe section of a pipe network and at the front and the rear of a static balance regulating valve, remotely transmitting pressure signals to a centralized control platform provided with static hydraulic balance software in a heat source or a heat exchange station, analyzing and calculating the pressure loss of each main pipe section and each user branch by the software, solving the flow of each user branch and each main pipe section according to the pressure values of the front and the rear of the regulating valve of each user branch, and further calculating the impedance of each main pipe section and the impedance of each user branch under the current opening of the static balance regulating valve; then, according to the design flow of each user and the obtained impedance of each main pipe section, software analyzes and calculates the necessary impedance of each user branch through the design flow; and finally, automatically calculating the impedance difference value of each user branch under the two working conditions by software, and automatically sending an instruction to an actuating mechanism of the static balance regulating valve of each user branch to adjust the opening degree of the actuating mechanism to the impedance value corresponding to the designed flow. The specific implementation method comprises the following steps:
firstly, the method comprises the following steps: calibrating performance parameters of a multi-gear static balance regulating valve arranged on each user branch, specifically determining the corresponding relation between the gears and impedance of the regulating valve;
respectively arranging a multi-gear static balance adjusting valve on each user branch pipeline, and calibrating the corresponding relation between the impedance (S) and the gear (N) of the adjusting valve:
further, according to the ideal relative flow of the regulating valve
Calibrating the corresponding relation with the gear (N)
Ideal relative flow of regulating valve
The correspondence with the gear (N) reflects that the differential pressure Δ P of the regulating valve at both ends of the regulating valve is constant at 105Regulating the relative flow of the valve under the condition of Pa
And the corresponding curve between gear (N). Relative flow refers to the ratio of the flow at a certain opening to the maximum opening flow, for a known ideal relative flow
Corresponding relation with gear (N) and maximum opening flow G of regulating valve1In the case of (2), the correspondence relationship between the absolute flow rate (G) of the control valve at each gear and the gear (N) can be obtained. Then according to the formula S ═ Δ P/G2The corresponding relation between the impedance (S) of each gear and the gear (N) of the regulating valve can be obtained. The specific method comprises the following steps:
(1) according to the desired relative flow of the regulating valve
Corresponding relation with gear (N) and maximum opening flow G1By the formula
Determining the pressure delta P of each gear at two ends of the regulating valve to be 10 constantly5Flow rate G at Pai；
(2) According to the formula
Changing Δ P to 105Pa and flow G corresponding to each geariSubstituting to obtain the impedance value S of the regulating valve at different gearsiAnd then obtaining the corresponding relation between the impedance (S) of the regulating valve and the gear (N). (ii) a
The flow rate unit is m3Per, impedance unit is Pa/(m)3/h)2The pressure difference is expressed in Pa, as follows.
Further, the calibration is performed based on the measurement result of the control valve
In the absence of ideal relative flow
Under the condition of corresponding relation with the gear (N), the curve relation between the impedance (S) of the regulating valve and the gear (N) can be obtained through actual measurement, and the specific method is as follows:
(1) on site or on a test bed, sequentially measuring the pressure difference delta P between two ends of the regulating valve at different gears according to the sequence of the gears from low to highiAnd flow rate Gi；
(2) According to the formula Si＝ΔPi/Gi 2Adjusting the differential pressure delta P between two ends of the valve at different gearsiAnd flow rate GiSubstituting to obtain the impedance value S of the regulating valve at different gearsiAnd then obtaining the corresponding relation between the impedance (S) of the regulating valve and the gear (N).
The more the multi-gear static balance adjusting valves arranged on each user branch pipeline are, the higher the adjusting precision is, so that the static balance adjusting valves with more gears are suggested to be adopted as much as possible.
Secondly, the method comprises the following steps: determining the position water heads of all pressure measuring points on the pipe network main pipe, and the concrete process is as follows:
inputting the calculation method of the position water heads of the pressure measuring points on the pipe network main pipe into an upper computer of a centralized control platform, converting pressure signals collected from the front and the back of each pressure sensor and a static balance regulating valve on each main pipe section into pressure data and transmitting the pressure data to the upper computer of the centralized control platform, and calling the calculation method by the upper computer so as to determine the position water heads of the pressure measuring points on the pipe network main pipe;
thirdly, the method comprises the following steps: determining the impedance S of each main pipe section including the most adverse useri，jAnd the impedances S of the other subscriber branchesi；
According to the static pressure value of the pressure measuring point of each main pipe section and the position water head of each pressure measuring point obtained in the second step, according to the formula delta Pi,j＝(Pi-Pj)+(Hi-Hj) ρ g, the drag loss Δ P of each main pipe section including the least favorable user under the second operating condition can be obtainedi，jAnd the resistance loss Δ P of each of the other subscriber legs (except the least favorable subscriber leg)i(because the difference between the resistance losses of the main pipe bypass flow tee and the direct flow tee is not large, in order to reduce the number of pressure measuring points, the resistance loss of each user branch is approximately the difference between the pressure measuring pipe head of the downstream pressure measuring point in the direct flow direction of the shunt tee on the water supply main pipe of the user branch and the pressure measuring pipe head of the downstream pressure measuring point of the return tee of the user branch in the return water main pipe); according to the pressure values before and after the regulating valve of each user branch, according to the impedance value and the formula corresponding to the gear of the regulating valve
The flow G of each user branch can be obtainediFurther, the flow G of each main pipe section on the worst loop can be obtainedi，j(ii) a According to the branch flow G of each useriFlow G of each main pipe sectioni，jUsing the formula S ═ Δ P/G2Further, the impedance S of each main pipe section of the most unfavorable loop can be obtainedi，jAnd the impedance S of each subscriber branch (except the least favorable subscriber branch)i；
Fourthly: determining the impedance of each user branch except the least utilized user branch under the designed flow;
according to the design flow G 'of each user'iThe design flow rate G 'of each dry pipe section can be obtained'i，j(ii) a Then according to the impedance S of the main pipe section obtained in the previous stepi，jAccording to the formula Δ P ═ S · G2The resistance loss amount delta P 'of each trunk pipe section of the most unfavorable loop under the design condition can be obtained'i，j(ii) a According to the series-parallel relation of pipe networksFurther, the qualification pressure delta P 'of each user branch under the design condition can be obtained'i(ii) a Finally, according to the formula S ═ delta P/G2The impedance S 'necessary for each subscriber branch to pass through the design flow can be calculated'i；
Fifth, the method comprises the following steps: calculating the impedance of each user branch static balance valve except the most unfavorable user, and adjusting the static balance valve to a corresponding gear;
impedance S 'of each user branch at design flow'iSubtracting the impedance S of each user branch under the second working conditioniImpedance S corresponding to gear of static balance valve under second working conditionfiObtaining the impedance S 'of each user branch static balance valve under the design flow rate thereof'fiI.e. S'fi＝S′i-(Si-Sfi) (ii) a Adjusting each user branch static balance valve to an impedance value S 'according to the corresponding relation between the gear of the adjusting valve obtained in the first step and the impedance'fiA corresponding gear; the regulating valve of the most unfavorable user is always maintained at the maximum opening degree in the whole process;
compiling a computer program according to the method provided by the first step to the fifth step, and installing the computer program on a centralized control platform; meanwhile, parameters such as pressure measured in real time by a pipe network under various operating conditions, real-time gears of the regulating valve under various operating conditions and the like are input into the centralized control platform through a technical means; the centralized control platform utilizes the programmed computer program to analyze and process data and calculate the impedance of each user branch static balance valve under the designed flow; the centralized control platform determines corresponding gears according to the impedance values of the static balance valves of the user branches under the designed flow respectively, and sends control instructions to the regulating and controlling device of the static balance valves to complete gear regulation.
The invention has the advantages that:
according to the traditional heat supply pipe network static balance method, under a certain operation condition, on the basis of calculating the regulation flow of each user one by one according to a certain regulation sequence and method, the actual flow of the heat supply pipe network reaches the calculated regulation flow by regulating user regulating valves one by one and matching with the measurement of a flow measurement instrument. The balance method based on flow calculation and regulation is difficult to ensure that a pipe network is in a certain specific working condition before or after regulation because the flow parameters change along with the change of the operating working condition, so that the methods can only be used as manual regulation methods with low accuracy. The static balance method based on the impedance determination of the regulating valve provided by the invention is characterized in that the impedance of each user branch reaches the impedance necessary for the balance of the pipe network through the opening of the regulating valve on the basis of determining the impedance of each branch before the balance of the pipe network and the impedance of each branch after the balance is finished respectively from the angle of the whole pipe network. The method for solving the overall hydraulic parameters based on the pipe network is convenient for realizing computer programming calculation, thereby being convenient for realizing the intellectualization of the static balance process; the adoption of a multi-gear regulating valve based on the corresponding relation between impedance and the gear of the regulating valve is beneficial to realizing the automation of the static hydraulic balance regulating process; meanwhile, the essence of static balance is that the flow distribution of each user meets a certain proportional relation by adjusting the impedance value of each user branch, and the method for determining the position water head of the pipeline node according to the hydraulic parameters of the pipeline network provides a basis for determining the impedance of each main pipeline section and each user branch under different operating conditions and the impedance of each user branch under the designed flow, and is the key for realizing the static balance of the pipeline network.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, the drawings in the following description are only schematic diagrams of one embodiment of the present invention, and it is obvious for those skilled in the art that other similar drawings can be obtained according to the drawings.
FIG. 1 is a schematic diagram of the arrangement of pressure measurement points in the control system of the present invention;
FIG. 2 is a schematic diagram of the arrangement of pressure measurement points in the embodiment of the control system of the present invention.
In the figure: k, a centralized control platform; b is1-a circulating water pump; y1, Y2, Y3, …, Yn-user; s-signal transmission line; f, a virtual pipe section; fD1，FD2，FD3，…，FDn-a dynamic balancing valve;FJ1，FJ2，FJ3，…，FJnthe static balance valve comprises L1, L2, L3, …, L n, sections of a water supply main pipe, L n +1, L n +2, L n +3, … and L2 n, sections of a water return main pipe, pressure measuring points of 1, 2, 3, …, n, pressure measuring points of the water supply main pipe, pressure measuring points of n +1, n +2, n +3, … and 2n, pressure measuring points of the water return main pipe, and pressure measuring points of 2n +1, 2n +2, 2n +3, … and 4n, wherein the pressure measuring points are arranged in front of and behind the static balance valve.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings so that the advantages and features of the invention can be more easily understood by those skilled in the art, and the scope of the invention will be clearly and clearly defined.
As shown in the arrangement schematic diagram of pressure measuring points in FIG. 1, the control system of the invention is characterized in that a centralized control platform K provided with static hydraulic balance software is arranged in a heat source or a heat exchange station; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged on a water supply and return main pipe of a heat source or a heat exchange station, namely, the pressure sensors are respectively arranged at pressure measuring points 1 and 2n of the water supply and return main pipe in the figure 1; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged at the downstream side of each user branch node of the water supply and return main pipe, namely, at the downstream side pressure measuring points 2, 3, …, 2n-1 of each user branch node of the water supply and return main pipe in figure 1; in addition to the dynamic balance valve F on each subscriber branch lineD1，FD2，FD3，…，FDnA multi-gear static balance regulating valve F is respectively arranged outsideJ1，FJ2，FJ3，…，FJnAnd pressure sensors and corresponding pressure signal conversion and remote transmission devices are respectively arranged in front of and behind the static balance regulating valve, namely, at the pressure measuring points 2n +1, 2n +2, 2n +3, … and 4n in front of and behind the static balance valve of each user branch pipeline in the figure 1.
The control method of the present invention is explained below as a specific example. The system configuration is as shown in figure 2,
as shown in the schematic layout of the pressure measuring points in FIG. 2, the control system of the invention is arranged in the heat source or the heat exchange stationA centralized control platform K provided with static hydraulic balance software; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged on a water supply main pipe and a water return main pipe of a heat source or a heat exchange station, namely the pressure sensor and the corresponding pressure signal conversion and remote transmission devices are arranged at a pressure measuring point 1 of the water supply main pipe and a pressure measuring point 8 of the water return main pipe in the figure 1; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged at the downstream side of each user branch node of the water supply and return main pipe, namely pressure measuring points 2, 3 and 4 at the downstream side of each user water supply main pipe branch node and pressure measuring points 5, 6 and 7 at the downstream side of each water return main pipe branch node in the figure 2 are arranged; in addition to the dynamic balance valve F on each subscriber branch lineD1、FD2、FD3、FD4A multi-gear static balance regulating valve F is respectively arranged outsideJ1～4And in static equilibrium adjusting valve FJ1、FJ2、FJ3、FJ4The pressure sensors and corresponding pressure signal conversion and remote transmission devices are arranged in front of and behind, namely, the pressure measuring points 9, 11, 13, 15 in front of the static balance regulating valve of each user branch pipeline and the pressure measuring points 10, 12, 14, 16 behind the static balance regulating valve in figure 2.
The specific measures of the control method in the embodiment of fig. 2 are as follows:
the first step is as follows: determining the corresponding relation between the impedance of a multi-gear static balance valve and the gear thereof
According to the method provided by the step one in the technical measures of the invention, the multi-gear static balance valve F of each user branch is obtainedJ1、FJ2、FJ3、FJ4And (c) the impedance (S) of (d) and the gear (n).
The second step is that: determining position water head of each pressure measuring point on pipe network main pipe
Constructing a virtual circuit: a pipeline connecting two measuring points is supposed to exist between a pressure measuring point 1 of a water supply main pipe and a pressure measuring point 8 of a water return main pipe, a circulating water pump B1 is supposed to be installed on the pipeline, the lift of the circulating water pump B1 is equal to the pressure difference between the pressure measuring point 1 and the pressure measuring point 8, and the flow of the circulating water pump B is equal to the total flow of a pipe network. Each customer leg may form a virtual circuit with the virtual pipe and the respective main pipe sections between them.
The static balance of the least favorable user Y4 is adjusted valve F firstD4Adjusting to the highest flow gear, keeping the heat supply system in a stable operation state under the first operation working condition, substituting the measured values of the pressure measuring points 1, 2, 3, 4, 5, 6, 7 and 8 on the water supply and return main pipe and the water supply and return main pipe into the resistance loss calculation formula delta P of each pipe sectioni,j＝(Pi-Pj)+(Hi-Hj) ρ g, expression Δ P according to kirchhoff's second law of each closed loop8，1＝∑ΔPi，j4 linearly independent virtual closed loop pressure equations may be listed; then keeping the gear of the static balance regulating valve of the least favorable user Y4 unchanged, regulating the gear of the static flow regulating valve of one or a plurality of other user branches to ensure that the hydraulic working condition of the system is obviously changed and is in a stable running state of a second running working condition, and calculating a formula delta P according to the resistance loss of each pipe sectioni,j＝(Pi-Pj)+(Hi-Hj) Rho g and kirchhoff's second law expression Δ P8，1＝∑ΔPi，jAnd substituting measured values of the pressure measuring points 1, 2, 3, 4, 5, 6, 7 and 8 on the water supply and return main pipe and the water supply and return main pipe section under the second operation working condition, and listing 4 linearly independent virtual closed loop pressure equations. And solving an equation set containing 8 linearly independent equations obtained under the two working conditions to obtain position water heads H1, H2, H3, H4, H5, H6, H7 and H8 of 8 pressure measuring points on the main pipe.
The third step: determining the impedance of each main pipe section and each user branch including the most unfavorable user under the second operation condition
According to the method provided by the step three in the technical method, the actual pressure measurement values of the pressure measurement points on the water supply and return main pipe and the main pipe under the second operation working condition and the position water heads of the pressure measurement points are substituted into the pipe section resistance loss calculation formula delta Pi,j＝(Pi-Pj)+(Hi-Hj) ρ g, the resistance loss Δ P of each main pipe section including the worst user under the working condition can be obtained2，3、ΔP3，4、ΔP4，5、ΔP5，6、ΔP6，7And the resistance loss deltap of the other subscriber legs1、ΔP2、ΔP3(ii) a Meanwhile, the regulating valve F can be balanced according to four user branchesJ1、FJ2、FJ3、FJ4Front and back static pressure and impedance corresponding to gears thereof by using formula
Can obtain the branch flow G of each user1、G2、G3、G4(ii) a According to the series-parallel connection relation of pipelines, the flow G of each trunk pipeline section can be obtained simultaneously2，3、G3，4、G4，5、G5，6、G6，7In a similar manner to that of. Then according to the formula S ═ Δ P/G2The impedance S of the individual main pipe sections, including the most unfavorable user, can then be determined2，3，S3，4，S4，5，S5，6，S6，7
And the impedance S of other subscriber' S branches1，S2，S3；
The fourth step: determining the impedance of each user branch except the least utilized branch at the designed flow
According to the design flow G 'of each user'iThe design flow rate G 'of each dry pipe section can be obtained'i，j(ii) a Then according to the impedance S of the main pipe section obtained in the previous stepi，jAccording to the formula Δ P ═ S · G2The resistance loss Δ P 'of each main pipe section including the most adverse user under the design condition can be obtained'i，j(ii) a According to the series-parallel connection relation of the pipe network, the qualification pressure delta P 'of other user branches except the least utilized outdoor under the design working condition can be obtained'1，ΔP′2，ΔP′3(ii) a Finally, according to the formula S ═ delta P/G2The impedance S 'necessary for each user branch except the least utilized outdoor to pass through the design flow can be calculated'1，S′2，S′3；
Fifth, the method comprises the following steps: calculating the impedance of the static balance valve of each user branch except the least utilized user branch, and adjusting the static balance valve to the corresponding gear
Impedance S 'of each user branch at design flow'i(i.e. S'1，S′2，S′3) Subtracting the impedance S of each user branch under the second working conditioni(i.e., S)1，S2，S3) Impedance S corresponding to gear of static balance valve under second working conditionfi(i.e., S)f1，Sf2，Sf3) By difference, i.e. S'fi＝S′i-(Si-Sfi) The impedance S 'of each customer branch static balance valve at its design flow rate can be obtained'fi(i.e. S'F1，S′f2，S′f3) (ii) a Then according to the corresponding relation between the gear of the regulating valve obtained in the first step and the impedance, the static balance valves of all user branches except the least utilized branch are regulated to respective designed impedance values S'fiA corresponding gear; the regulating valve of the most unfavourable user is kept at the maximum opening during the whole process.
The related parameters of the operation of the pipe network are input into the centralized control platform K in real time through the signal transmission line S, and the impedance of each user branch static balance valve 7 under the designed flow can be obtained through data analysis and processing of the centralized control platform K. The centralized control platform K respectively balances the valves F according to the static state of each user branchJ1、FJ2、FJ3Impedance value S 'at design flow'f1，S′f2，S′f3Determining corresponding gears, and sending control instructions to the regulating device of the static balance valve to complete the static balance valve FJ1、FJ2、FJ3And (4) gear adjustment.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes and substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. An automatic regulating system for the static hydraulic balance of a centralized heat supply pipe network is characterized in that a centralized control platform provided with static hydraulic balance software is arranged in a heat source or a heat exchange station of a heat supply system; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged on a water supply main pipe and a water return main pipe of a heat source or a heat exchange station; a pressure sensor and a corresponding pressure signal conversion and remote transmission device are respectively arranged at the downstream side of each user branch node of the water supply and return main pipe; a multi-gear static balance regulating valve is respectively arranged on each user branch pipeline, and a pressure sensor and a corresponding pressure signal conversion and remote transmission device are arranged in front of and behind the valve.
2. The method for determining the position water heads of the pressure measuring points on the main pipe of the centralized heat supply pipe network of the automatic static hydraulic balance system as claimed in claim 1, is characterized in that:
the first step is as follows: constructing virtual circuits
Between two pressure measuring points of a main water supply and return pipe, a pipeline connecting the two measuring points is supposed to exist, a circulating water pump is supposed to be installed on the pipeline, and the lift of the circulating water pump is equal to the head difference of the pressure measuring pipes between the two measuring points, namely delta P2n，1＝(P1-P2n)+(H1-H2n) If the flow rate is equal to the total flow rate of the pipe network, each user branch can form a virtual circuit with the virtual pipeline and each main pipe section between the virtual pipeline and the virtual pipeline; in the above formula, the first and second carbon atoms are,
ΔP2n，1representing a virtual circulating water pump lift, Pa;
P1representing the measured value of the static pressure of the pressure measuring point of the water supply main pipe, Pa;
P2nrepresenting a static pressure actual measurement value Pa of a pressure measurement point of a backwater main pipe;
H1shows the water head of the pressure measuring point position of the water supply main pipe, mH2o；
H2nShows the water head of the pressure measuring point position of the total main return pipe, mH2o；
ρ represents the density of water, kg/m3；
g represents the gravity acceleration, and 9.8N/kg is taken;
the second step is that: if the heat supply system has N users, the number of the pressure measuring points on the main pipe is 2N (including two pressure measuring points on the total main pipe for supplying and returning water), the number of the position water heads of the pressure measuring points to be solved is 2N, and the 2N quantities to be solved can be obtained by using an equation set established according to the following method:
2.1: firstly, regulating a static balance regulating valve of the most unfavorable user branch to a highest flow gear, and enabling a heat supply system to be in a certain stable operation state, namely a first operation working condition, so that the static pressure of each measuring point in the first operation working condition can be measured; calculating formula delta P according to resistance loss of each pipe sectioni,j＝(Pi-Pj)+(Hi-Hj) ρ g and kirchhoff's second law expression, Δ P2n，1＝∑ΔPi，jSubstituting the static pressure values of the pressure measuring points under the first working condition into the relational expression to list N linearly independent virtual loop pressure equations under the first operating condition;
the meaning of each letter in the formula is:
ΔP2n，1representing a virtual circulating water pump lift, Pa;
ΔPi，jrepresenting the resistance loss, Pa, between adjacent pressure measuring points on the main pipe section of each virtual circulation loop;
Pirepresenting the actual measured value, Pa, of the static pressure of the upstream pressure measuring point in the adjacent pressure measuring points on the main pipe section of each virtual circulation loop;
Pjrepresenting the actual static pressure measured value, Pa, of a downstream pressure measuring point in adjacent pressure measuring points on the main pipe section of each virtual circulation loop;
Hirepresents the water head, mH, of the upstream pressure measuring point in the adjacent pressure measuring points on the main pipe section of each virtual circulation loop2o；
HjRepresents the water head, mH, of the downstream pressure measuring point in the adjacent pressure measuring points on the main pipe section of each virtual circulation loop2o；
ρ represents the density of water, kg/m3；
g represents the gravity acceleration, and 9.8N/kg is taken;
2.2: the static balance regulating valve of the least favorable user branch is still kept at the highest flow gear, the static flow regulating valves of one or a plurality of user branches are regulated, the hydraulic working condition of the system is obviously changed and is in a stable running state, which is called as a second running working condition, the static pressure of each measuring point under the second running working condition can be measured, and N linearly independent virtual loop pressure equations under the second running working condition are listed by adopting the method same as the first running working condition;
2.3: solving the equation set containing 2N linearly independent equations obtained from the first and second operating conditions to obtain the position water head H of 2N pressure measuring points on the main pipei(i＝1，2N)。
3. The method for realizing the automatic regulating system of the static hydraulic balance of the central heating pipe network according to claim 1 is characterized by comprising the following specific steps:
firstly, the method comprises the following steps: calibrating performance parameters of a multi-gear static balance regulating valve arranged on each user branch, specifically determining the corresponding relation between the gears and impedance of the regulating valve;
according to the desired relative flow of the regulating valve
The correspondence between the shift position (N) and the impedance (S) of the control valve or the correspondence between the measured values of the control valve and the shift position (N) is calibrated:
secondly, the method comprises the following steps: determining the position water heads of all pressure measuring points on the pipe network main pipe, and the concrete process is as follows:
inputting the calculation method of the position water heads of the pressure measuring points on the pipe network trunk pipe, which is described in the claim 2, into an upper computer of a centralized control platform, converting pressure signals, which are acquired from the front and the back of each pressure sensor and a static balance regulating valve on each trunk pipe section, into pressure data and transmitting the pressure data to the upper computer of the centralized control platform, and using the calculation method by the upper computer to determine the position water heads of the pressure measuring points on the pipe network trunk pipe;
thirdly, the method comprises the following steps: determining the impedance S of each main pipe section including the most adverse useri，jAnd the impedances S of the other subscriber branchesi；
According to the static pressure value of the pressure measuring point of each main pipe section and the position water head of each pressure measuring point obtained in the second step, according to the formula delta Pi,j＝(Pi-Pj)+(Hi-Hj) ρ g, the drag loss Δ P of each main pipe section including the least favorable user under the second operating condition can be obtainedi，jAnd the resistance loss deltap of the other subscriber legsi(ii) a According to the pressure values before and after the regulating valve of each user branch, according to the impedance value and the formula corresponding to the gear of the regulating valve
The flow G of each user branch can be obtainediFurther, the flow G of each main pipe section on the worst loop can be obtainedi，j(ii) a According to the branch flow G of each useriFlow G of each main pipe sectioni，jUsing the formula S ═ Δ P/G2Further, the impedance S of each main pipe section of the most unfavorable loop can be obtainedi，jAnd the impedances S of the other subscriber branchesi；
Fourthly: determining the impedance of each user branch except the least utilized user branch under the designed flow;
according to the design flow G 'of each user'iThe design flow rate G 'of each dry pipe section can be obtained'i，j(ii) a Then according to the impedance S of the main pipe section obtained in the previous stepi，jAccording to the formula Δ P ═ S · G2The resistance loss amount delta P 'of each trunk pipe section of the most unfavorable loop under the design condition can be obtained'i，j(ii) a According to the series-parallel relation of the pipe network, the qualification pressure delta P 'of each user branch under the design working condition can be obtained'i(ii) a Finally, according to the formula S ═ delta P/G2The impedance S 'necessary for each subscriber branch to pass through the design flow can be calculated'i；
Fifth, the method comprises the following steps: calculating the impedance of each user branch regulating valve except the least utilized outdoor, and regulating the regulating valves to corresponding gears;
impedance S 'of each user branch at design flow'iSubtracting the impedance S of each user branch under the second working conditioniImpedance S corresponding to the gear of the regulating valve under the second working conditionfiThe difference value can obtain the impedance S 'of each user branch regulating valve under the design flow'fiI.e. S'fi＝S′i-(Si-Sfi) (ii) a Adjusting each user branch adjusting valve to an impedance value S 'according to the corresponding relation between the gear of the adjusting valve obtained in the first step and the impedance'fiA corresponding gear; the regulating valve of the most unfavorable user is always maintained at the maximum opening degree in the whole process;
compiling a computer program according to the method provided by the first step to the fifth step, and installing the computer program on a centralized control platform; meanwhile, parameters such as pressure measured in real time by a pipe network under various operating conditions, real-time gears of the regulating valve under various operating conditions and the like are input into the centralized control platform through a technical means; the centralized control platform utilizes the programmed computer program to analyze and process data and calculate the impedance of each user branch regulating valve under the designed flow; the centralized control platform determines corresponding gears according to the impedance values of the user branch regulating valves under the designed flow, and sends control instructions to the regulating and controlling devices of the regulating valves to complete gear regulation.
4. The method for implementing the automatic regulating system for the static hydraulic balance of the centralized heating pipe network according to claim 3, wherein the ideal relative flow rate of the regulating valve is determined according to the ideal relative flow rate of the regulating valve
The method for calibrating the corresponding relation between the impedance (S) of each gear and the gear (N) according to the corresponding relation with the gear (N) comprises the following steps:
(1) according to the desired relative flow of the regulating valve
Corresponding relation with gear (N) and maximum opening flow G1By the formula
Determining the pressure delta P of each gear at two ends of the regulating valve to be 10 constantly5Flow rate G at Pai；
(2) According to the formula
Changing Δ P to 105Pa and flow G corresponding to each geariSubstituting to obtain the impedance value S of the regulating valve at different gearsiFurther obtaining the corresponding relation between the impedance (S) of the regulating valve and the gear (N);
the flow rate unit is m3Per, impedance unit is Pa/(m)3/h)2The pressure difference is expressed in Pa.
5. The method for implementing the automatic regulating system for the static hydraulic balance of the centralized heating pipe network according to claim 3, wherein the method for calibrating the corresponding relationship between the impedance (S) and the gear (N) of each gear according to the measurement result of the regulating valve comprises the following steps:
(1) on site or on a test bed, sequentially measuring the pressure difference delta P between two ends of the regulating valve at different gears according to the sequence of the gears from low to highiAnd flow rate Gi；
(2) According to the formula Si＝ΔPi/Gi 2Adjusting the differential pressure delta P between two ends of the valve at different gearsiAnd flow rate GiSubstituting to obtain the impedance value S of the regulating valve at different gearsiAnd then obtaining the corresponding relation between the impedance (S) of the regulating valve and the gear (N).
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