CN113251322A - Method and system for drain valve leakage judgment and steam leakage loss - Google Patents

Method and system for drain valve leakage judgment and steam leakage loss Download PDF

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CN113251322A
CN113251322A CN202110595396.9A CN202110595396A CN113251322A CN 113251322 A CN113251322 A CN 113251322A CN 202110595396 A CN202110595396 A CN 202110595396A CN 113251322 A CN113251322 A CN 113251322A
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steam
leakage
drain valve
pressure
trap
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蔡国忠
彭烁
陈飞文
蔡纯
陈俊荣
卢叙钿
周贤
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Haimen Power Plant Of Huaneng Guangdong Energy Development Co ltd
Huaneng Clean Energy Research Institute
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Haimen Power Plant Of Huaneng Guangdong Energy Development Co ltd
Huaneng Clean Energy Research Institute
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08—Thermal analysis or thermal optimisation

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  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
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Abstract

The invention discloses a method and a system for drain valve leakage judgment and steam leakage loss, 1, establishing a mechanism model of a steam heat supply pipe network through kirchhoff's first and second laws and pressure and flow resistance in a steam pipe network; 2. monitoring the sound wave signal of each drain valve, and judging whether the drain valve leaks or not according to the sound wave signal; 3. calculating the steam pressure of a steam pipeline in front of a drain valve at a leakage position by using a mechanism model of a steam heat supply pipe network; 4. and calculating the steam leakage loss according to the steam pressure of the steam pipeline in front of the drain valve at the leakage position. Whether the steam state of the pipe network leaks can be judged, and the steam leakage loss amount is obtained through calculation, so that timely alarming and positioning are realized.

Description

Method and system for drain valve leakage judgment and steam leakage loss
Technical Field
The invention belongs to the field of heat supply safety, and relates to a method and a system for drain valve leakage judgment and steam leakage loss.
Background
The steam heating network is often equipped with pipeline accessories such as drain valves, and the leakage of the drain valves is often an important reason for generating leakage loss of the steam heating network and is also an important component of the loss of the steam heating network. Therefore, the leaked steam trap needs to be identified, the leakage amount is calculated in a software and hardware combined mode, and the obtained calculation result is uploaded to a database, so that the attention of operation managers is attracted. At present, a plurality of empirical formulas are used for calculating the valve leakage, but the calculation is usually based on the pressure difference between the front and the back of the valve. Because the drain pipe is generally arranged in the atmospheric environment, the pressure behind the valve is generally known, and the steam pressure in front of the valve is difficult to obtain due to the lack of a corresponding measuring instrument. In the actual process, the steam pressure is often reversely deduced by measuring the temperature of the pipe wall instead of the steam temperature through a technician arriving at the site, and the manual measurement mode is time-consuming and labor-consuming.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a system for judging leakage of a steam trap and steam leakage loss, which can judge whether the steam state of a pipe network leaks or not and calculate the steam leakage loss amount so as to realize timely alarming and positioning.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for judging leakage of a trap and loss of steam leakage comprises the following steps;
step one, establishing a mechanism model of a steam heat supply pipe network through kirchhoff's first and second laws and pressure and flow resistance in a steam pipe network;
monitoring the sound wave signal of each drain valve, and judging whether the drain valve leaks or not according to the sound wave signal;
thirdly, calculating the steam pressure of a steam pipeline in front of the drain valve at the leakage position by using a mechanism model of a steam heat supply pipe network;
and step four, calculating the steam leakage loss according to the steam pressure of the steam pipeline in front of the drain valve at the leakage position.
Preferably, in the step one, the process of establishing the mechanism model of the steam heat supply pipe network is as follows:
representing all nodes and all resistance sections in the heat network by sets V and E, respectively;
V＝{V1，…，Vi，…，VI}
E＝{E1，…，Ej，…，EJ}
i is a node number; i is the total number of nodes in the model (I is more than or equal to 1 and less than or equal to I); j is the resistance section number; j is the total number of the resistance sections in the model (J is more than or equal to 1 and less than or equal to J);
the steam in the heat supply network meets a kirchhoff first law and a kirchhoff second law;
kirchhoff's first law: AQT+q＝0
Kirchhoff's second law: BP (Back propagation) ofT＝0；
In the formula: vector P represents the total drag loss over each drag segment:
P＝[ΔP1…ΔPj…ΔPJ]
in steam pipe networks, the flow resistance in the pipe:
Figure BDA0003090811200000021
εjis EjThe sum of the coefficients of resistance of the internal resistance components; deltajIs EjThe friction resistance coefficient of the internal working medium; ljIs EjLength of straight pipe segment; rhojIs EjDensity of the internal working medium; omegajIs EjThe flow velocity of the internal working medium; djIs EjOf the inner diameter of (a).
Preferably, an acoustic wave sensor is positioned at each trap prior to step two.
Preferably, in the second step, after the trap is judged to be leaking, the leakage level is judged according to the difference of the acoustic signals before and after the acoustic signal of the trap leaks.
Preferably, in the third step, the steam pressure of the steam pipeline in front of the drain valve at the leakage position is calculated according to the real-time data of the operation of the steam heat supply pipe network; the real-time data of the operation of the steam heat supply pipe network comprises actually measured steam parameters at the heat source 1 and actually measured steam parameters at the end user, and the steam parameters refer to steam pressure.
Preferably, in the fourth step, the calculation process of the steam leakage loss amount is as follows:
Figure BDA0003090811200000031
wherein: m is the mass flow of the steam; delta P is the pressure drop through the small hole, namely the difference between the steam pressure before the valve and the steam pressure after the valve, and when the drain valve is directly discharged into the atmosphere, the back pressure is 0; e is
Figure BDA0003090811200000032
d is the inner diameter of the small hole; d is the inner diameter of the pipeline; vgIs the specific volume of the steam before the steam trap; alpha is a conversion coefficient.
A drain valve leakage determination and steam leakage loss system comprises;
the mechanism model building module of the steam heat supply pipe network is used for building a mechanism model of the steam heat supply pipe network through kirchhoff's first and second laws and pressure and flow resistance in a steam pipe network;
the leakage judging module is used for monitoring the sound wave signal of each drain valve and judging whether the drain valve leaks or not according to the sound wave signal;
the steam pressure calculation module of the steam pipeline in front of the drain valve is used for calculating the steam pressure of the steam pipeline in front of the drain valve at the leakage position by using a mechanism model of a steam heat supply pipe network;
and the steam leakage loss calculation module is used for calculating the steam leakage loss according to the steam pressure of the steam pipeline in front of the drain valve at the leakage position.
A computer device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, said processor when executing said computer program implementing the steps of the method for trap leak determination and steam leak loss as defined in any of the above.
A computer readable storage medium storing a computer program which when executed by a processor implements the steps of the method for steam trap leak determination and steam leak loss as described in any of the above.
Compared with the prior art, the invention has the following beneficial effects:
the invention judges whether the drain valve leaks according to the sound wave signal, calculates the steam pressure of the steam pipeline in front of the drain valve at the leakage position through the mechanism model of the steam heat supply pipe network, calculates the steam leakage loss amount according to the steam pressure of the steam pipeline in front of the drain valve at the leakage position, can accurately judge whether the steam state of the pipe network leaks, and calculates the steam leakage loss amount, thereby realizing the timely alarming and positioning.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic view of a steam heat grid system of the present invention.
Wherein: 1-a heat source; 2-a steam main pipeline; 3-hot user; 4-a hydrophobic bypass; 5-a bypass valve; 6-a drain valve; 7-an induction chamber; 8-computing terminal.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific and illustrative embodiments thereof, which are provided for the purpose of illustrating the invention and are not to be construed as limiting the invention in any way.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used herein, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in FIG. 1, the method for detecting leakage and steam loss of a steam trap 6 according to the present invention comprises the following steps
And S1, establishing a mechanism model of the steam heating pipe network through the first and second kirchhoff laws and the pressure and flow resistance in the steam pipe network.
S2, monitoring the sound wave signal of each trap 6, and judging whether the trap 6 leaks according to the sound wave signal.
And S3, calculating the steam pressure of the steam pipeline in front of the drain valve 6 at the leakage position by using the model in the step S1 according to the real-time data of the operation of the steam heat supply pipe network.
And S4, calculating the steam leakage loss according to the steam pressure of the steam pipeline before and after the steam trap 6 at the leakage position.
The real-time data of the operation of the steam heat supply pipe network comprises actually measured steam parameters at the heat source 1 and actually measured steam parameters at the end user, and the steam parameters mainly refer to steam pressure.
Firstly, establishing a mechanism model of a steam heating network:
the whole heat supply network is regarded as a directed flow chart consisting of a plurality of nodes and resistance sections, wherein the nodes refer to the points of the heat source 1, the heat user 3 and the steam trap where flow enters and exits, and the pipelines between the connecting nodes are called the resistance sections.
All nodes and all resistance segments in the heat network may be represented by sets V and E, respectively:
V＝{V1，…，Vi，…，VI}
E＝{E1，…，Ej，…，VJ}
i is a node number; i is the total number of nodes in the model (I is more than or equal to 1 and less than or equal to I); j is the resistance section number; j is the total number of the resistance sections in the model (J is more than or equal to 1 and less than or equal to J).
The heat supply network model generally comprises a plurality of base rings, namely a plurality of independent basic loops. Can be represented by the set B:
B＝{B1，…，Bs，…，BS}
in the formula: s is the base ring number; s is the total number of the base rings in the model (S is more than or equal to 1 and less than or equal to S).
I. J, S have the following relationship:
S＝J-I+1
to describe the relationship between each node, the resistive segments, and the base ring in the heat network, two correlation matrices, a and B, are defined, representing the relationship between the node and the resistive segment, and the base ring and the resistive segment, respectively.
Figure BDA0003090811200000061
Figure BDA0003090811200000062
Figure BDA0003090811200000063
Figure BDA0003090811200000064
The net mass flow at the node and the mass flow over each resistive segment can be represented by vectors Q and Q, respectively:
q＝[q1…qi…qI]T
Q＝[Q1…Qj…QJ]
in the formula:
Figure BDA0003090811200000065
steam within the heat grid must satisfy kirchhoff's first law and kirchhoff's second law. The method comprises the following specific steps:
kirchhoff's first law (node flow conservation law), that is, the sum of the mass flows of the working media flowing into any node of the heat supply network is equal to the sum of the mass flows of the working media flowing out of the node in any time period.
AQT+q＝0 (1)
Kirchhoff's second law (law of conservation of loop energy): at any moment, resistance losses calculated from one node to the other node along different side pipelines in any closed loop in the heat supply network are equal.
BPT＝0 (2)
In the formula: vector P represents the total drag loss over each drag segment:
P＝[ΔP1…ΔPj…ΔPJ] (3)
in steam pipe networks, the flow resistance in the pipe:
Figure BDA0003090811200000071
εjis EjSum of coefficients of resistance of internal resistance elements
εjIs EjThe sum of the coefficients of resistance of the internal resistance components; deltajIs EjThe friction resistance coefficient of the internal working medium; ljIs EjLength of straight pipe segment; rhojIs EjDensity of the internal working medium; omegajIs EjThe flow velocity of the internal working medium; djIs EjOf the inner diameter of (a).
By combining the equations, the pressure at each position of the mechanism model of the closed steam heat supply pipe network for multi-heat source 1 combined heat supply can be solved, and the steam pressure of the steam pipeline in front of each drain valve 6 can be accurately calculated.
The monitor of the trap 6 uploads the monitored sound wave signals, and whether the trap 6 leaks is judged according to the sound wave signals. And when the trap 6 leaks, analyzing the leakage degree according to the difference of the acoustic signals before and after the acoustic signal of the trap 6 leaks.
And (3) calculating the steam pressure of the steam pipeline in front of the drain valve 6 at the leakage position by using a mechanism model of a steam heat supply pipe network.
The steam leakage calculation formula of the steam trap 6 is a formula for calculating the flow rate of fluid passing through the small hole, and comprises the following steps:
Figure BDA0003090811200000072
wherein: m: mass flow rate of steam (kg/h); Δ P: the pressure drop (mm water column) across the orifice, i.e. the difference between the steam pressure before the valve and the steam pressure after the valve. When the trap 6 is directly discharged into the atmosphere, the back pressure is 0; the pressure in front of the steam trap 6 is calculated according to the steam pressure of the main pipe by a mechanism model according to real-time data. d: small bore inner diameter (mm); d: inner diameter of tubing (mm); vg: specific volume (m) under steam pressure before trap 63/kg)；E：
Figure BDA0003090811200000081
α: and (4) converting the coefficient.
The internal diameter d of the small hole of the trap 6, i.e., the diameter of the drainage hole, is shown in Table 1:
TABLE 1
6-caliber drain valve Diameter of drainage aperture
1/2”/15mm 3mm
3/4”/20mm 5mm
1”/25mm 7.5mm
1 1/2”/40mm 10mm
2”/50mm 12.5mm
The conversion factors for different leakage levels are shown in table 2:
TABLE 2
Grade of leakage (degree) Conversion coefficient
Grade one (big hourglass) 40％
Grade two (middle leakage) 33％
Grade three (Small hourglass) 16.5％
Grade four (slight leakage) 3.3％
Conversion coefficient of calculation result: the theoretical leakage calculated from the above information needs to take a certain conversion coefficient because: the drain valve 6 cannot be fully opened when leaking; the geometrical shape of the valve seat influences the flow, and impurities in the pipeline can cause the blockage of the drainage hole part; when the condensed water is discharged, flash steam is generated, and the flash steam generates resistance and reduces the flow rate through the small hole.
The invention utilizes the hydraulic balance and thermal balance equation to carry out simulation modeling on the heat supply pipeline, and combines real-time data to calculate the steam parameter (pressure) in front of each drain valve 6. And judging whether leakage occurs or not through signals uploaded by the sound wave sensor, and after the leakage is judged, analyzing the sound wave waveform by the upper system according to the leakage signals and identifying the leakage degree. The amount of steam leaked is then calculated according to the correlation formula.
The invention relates to a drain valve leakage judgment and steam leakage loss system, which comprises a steam outlet, a steam outlet and a steam outlet;
and the mechanism model establishing module of the steam heat supply pipe network is used for establishing a mechanism model of the steam heat supply pipe network through kirchhoff first and second laws and pressure and flow resistance in a steam pipe in the steam pipe network.
And the leakage judging module is used for monitoring the sound wave signal of each drain valve 6 and judging whether the drain valve 6 leaks or not according to the sound wave signal.
And the steam pressure calculation module of the steam pipeline in front of the steam trap 6 is used for calculating the steam pressure of the steam pipeline in front of the steam trap 6 at the leakage position by using a mechanism model of a steam heat supply pipe network.
And the steam leakage loss calculation module is used for calculating the steam leakage loss according to the steam pressure of the steam pipeline in front of the drain valve 6 at the leakage position.
The computer device of the present invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for determining steam trap leakage and steam leakage loss as described in any of the above when executing the computer program.
As shown in fig. 2, the steam heating pipe network system of the present invention includes a heat source 1, the heat source 1 is communicated with a heat consumer 3 through a steam main pipe 2, the steam main pipe 2 is connected with a drain bypass 4, the drain bypass 4 is connected with a bypass valve 5 and a drain valve 6, an induction chamber 7 is disposed beside the bypass valve 5 and the drain valve 6, an acoustic wave sensor is disposed in the induction chamber 7, a computing terminal 8 is disposed in the system, the computing terminal 8 can be the above computer device, and the computing terminal 8 is connected with the heat source 1, the heat consumer 3 and the induction chamber 7.
The computer readable storage medium of the present invention stores a computer program, which when executed by a processor implements the steps of any of the methods for steam trap leakage determination and steam leakage loss as described above.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (9)

1. A method for judging leakage of a trap and loss of steam leakage is characterized by comprising the following steps;
step one, establishing a mechanism model of a steam heat supply pipe network through kirchhoff's first and second laws and pressure and flow resistance in a steam pipe network;
monitoring the sound wave signal of each drain valve (6), and judging whether the drain valve (6) leaks or not according to the sound wave signal;
thirdly, calculating the steam pressure of a steam pipeline in front of the drain valve (6) at the leakage position by using a mechanism model of a steam heat supply pipe network;
and step four, calculating the steam leakage loss according to the steam pressure of the steam pipeline in front of the drain valve (6) at the leakage position.
2. The method for determining steam trap leakage and steam leakage loss according to claim 1, wherein in the first step, the process of establishing a mechanism model of the steam heating pipe network comprises the following steps:
representing all nodes and all resistance sections in the heat network by sets V and E, respectively;
V＝{V1，…，Vi，…，VI}
E＝{E1，…，Ej，…，EJ}
i is a node number; i is the total number of nodes in the model (I is more than or equal to 1 and less than or equal to I); j is the resistance section number; j is the total number of the resistance sections in the model (J is more than or equal to 1 and less than or equal to J);
the steam in the heat supply network meets a kirchhoff first law and a kirchhoff second law;
kirchhoff's first law: AQT+q＝0
Kirchhoff's second law: BP (Back propagation) ofT＝0；
In the formula: vector P represents the total drag loss over each drag segment:
P＝[ΔP1 … ΔPj … ΔPJ]
in steam pipe networks, the flow resistance in the pipe:
Figure FDA0003090811190000021
εjis EjThe sum of the coefficients of resistance of the internal resistance components; deltajIs EjThe friction resistance coefficient of the internal working medium; ljIs EjLength of straight pipe segment; rhojIs EjDensity of the internal working medium; omegajIs EjThe flow velocity of the internal working medium; djIs EjOf the inner diameter of (a).
3. The steam trap leakage determination and steam leakage loss method of claim 1 wherein, prior to step two, an acoustic wave sensor is provided at each steam trap (6).
4. The method for determining steam trap leakage and steam leakage loss according to claim 1, wherein in step two, after the steam trap (6) is determined to be leaking, the leakage level is determined based on the difference between the acoustic signals before and after the acoustic signal of the steam trap (6) leaks.
5. The method for judging leakage of the steam trap and losing leakage of steam as claimed in claim 1, wherein in step three, the steam pressure of the steam pipeline in front of the steam trap (6) at the leakage position is calculated according to the real-time data of the operation of the steam heat supply pipe network; the real-time data of the operation of the steam heat supply pipe network comprises actually measured steam parameters at the heat source 1 and actually measured steam parameters at the end user, and the steam parameters refer to steam pressure.
6. The method for determining steam trap leakage and steam leakage loss according to claim 1, wherein in the fourth step, the calculation procedure of the steam leakage loss amount is as follows:
Figure FDA0003090811190000022
wherein: m is the mass flow of the steam; delta P is the pressure drop through the small hole, namely the difference between the steam pressure before the valve and the steam pressure after the valve, and when the drain valve (6) is directly discharged into the atmosphere, the back pressure is 0; e is
Figure FDA0003090811190000023
d is the inner diameter of the small hole; d is the inner diameter of the pipeline; vgIs the specific volume of the steam pressure before the steam trap (6); alpha is a conversion coefficient.
7. A drain valve leakage determination and steam leakage loss system is characterized by comprising;
the mechanism model building module of the steam heat supply pipe network is used for building a mechanism model of the steam heat supply pipe network through kirchhoff's first and second laws and pressure and flow resistance in a steam pipe network;
the leakage judging module is used for monitoring the sound wave signal of each drain valve (6) and judging whether the drain valve (6) leaks or not according to the sound wave signal;
the steam pressure calculation module of the steam pipeline in front of the steam trap (6) is used for calculating the steam pressure of the steam pipeline in front of the steam trap (6) at the leakage position by using a mechanism model of a steam heat supply pipe network;
and the steam leakage loss calculation module is used for calculating the steam leakage loss according to the steam pressure of the steam pipeline in front of the drain valve (6) at the leakage position.
8. A computer device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, wherein said processor when executing said computer program performs the steps of the method for steam trap leak determination and steam leak loss of any one of claims 1 to 6.
9. A computer-readable storage medium, storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the method for determining steam trap leakage and loss of steam leakage according to any one of claims 1-6.
CN202110595396.9A 2021-05-28 2021-05-28 Method and system for drain valve leakage judgment and steam leakage loss Withdrawn CN113251322A (en)

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CN117010131A (en) * 2023-09-14 2023-11-07 华能苏州热电有限责任公司 Method for analyzing network management loss of steam heating pipe

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