CN111539110B - Drain valve internal leakage detection method and device, computer equipment and storage medium - Google Patents
Drain valve internal leakage detection method and device, computer equipment and storage medium Download PDFInfo
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- CN111539110B CN111539110B CN202010341147.2A CN202010341147A CN111539110B CN 111539110 B CN111539110 B CN 111539110B CN 202010341147 A CN202010341147 A CN 202010341147A CN 111539110 B CN111539110 B CN 111539110B
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Abstract
The invention relates to a drain valve internal leakage detection method, a device, computer equipment and a storage medium, wherein the method comprises the following steps: acquiring temperature information of a preset temperature measuring point in the drainage pipeline, and acquiring a cooling capacity calculation model of the drainage pipeline; according to the cooling capacity calculation model and the temperature information, calculating to obtain cooling capacity; according to the cooling capacity, the internal leakage quantity of the drain valve is obtained so as to realize detection of the internal leakage of the drain valve, when the drain valve is closed, the temperature value of a preset temperature measuring point in the drain pipe is kept unchanged after the preset time passes, namely the phase change surface in the drain pipe is not changed any more, the temperature value is recorded, the cooling capacity can be accurately calculated according to the measured temperature information and a cooling capacity calculation model, and then the internal leakage quantity of the drain valve is calculated according to the cooling capacity so as to realize accurate detection of the internal leakage quantity of the drain valve.
Description
Technical Field
The present disclosure relates to the field of thermal engineering technologies, and in particular, to a drain valve leak detection method, a drain valve leak detection device, a computer device, and a storage medium.
Background
In critical loops of thermodynamic systems of large thermal power plants and the like, whether subcritical, supercritical or ultra supercritical thermodynamic systems, a large number of drain valves (also referred to as high-end valves) are required. The hydrophobic valve is a shut-off valve working in severe environment, and the valve does not play a role in regulation and only has two working modes of full-closed or full-open; in particular, the hydrophobic valve is often in a working environment where the pre-valve pressure reaches subcritical, supercritical or supercritical levels, the temperature of the flow medium reaches 600 ℃, the valve is negative in pressure and the temperature is lower than the ambient temperature; under such large pressure difference and temperature difference, the drain valve is free to switch and cannot leak inwards; otherwise, serious safety accidents and economic losses are caused.
Specifically, the influence of the internal leakage of the hydrophobic valve on the economic loss is mainly shown in the following steps:
(1) The internal leakage of the valve not only can cause a certain amount of work loss, but also can increase the heat load of the condenser, so that the exhaust steam vacuum of the unit is reduced, the power generation heat consumption is increased, and even the unit cannot run at full load when the internal leakage is serious. (2) The leakage in the valve has a larger influence on the coal consumption of the unit, and particularly the higher the unit parameter is, the larger the influence is. (3) Even when the valve leaks seriously, the unit has to be stopped for maintenance, the available hours of the unit are reduced, and larger economic loss is caused. (4) The internal leakage of the valve directly increases the production cost of valve maintenance, repair and replacement.
The influence of the internal leakage of the hydrophobic valve on the safety production is mainly expressed in the following steps:
(1) The leakage in the valve can not isolate the running equipment, so that safety measures during maintenance can not be executed in place, and the life safety of maintenance personnel is threatened. (2) When the valve leaks seriously, the unit is possibly forced to stop, and power production accidents such as unplanned outage and the like are caused.
Therefore, diagnosing and supervising whether an internal leakage occurs in operation of a hydrophobic valve is a focus of attention in the industry. However, in the prior art, table 1 is generally adopted as a basis for judging whether the internal leakage condition of the hydrophobic valve occurs;
table 1 drain valve internal leakage criterion
However, the judgment basis does not give a theoretical basis, and only has special cases, and has no general guiding significance at all; further, in some drain valve internal leakage diagnosis practices, the internal leakage of the valve with the valve body temperature being lower than 50 ℃ is detected, and the drain valve with the valve body temperature being close to 400 ℃ is proved to be free from the internal leakage, so that the internal leakage is detected according to the judgment, the detection error is larger, and the accurate detection of the internal leakage cannot be realized; therefore, how to accurately detect the leakage in the drain valve is a problem that needs to be solved in the industry.
Disclosure of Invention
Based on the above, it is necessary to provide a drain valve internal leakage detection method aiming at the problem that the conventional internal leakage detection method has large error in detecting the internal leakage of the drain valve.
The method for detecting the leakage in the drain valve comprises the following steps:
acquiring temperature information of a preset temperature measuring point in a drain pipe, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when a drain valve is in a closed state;
acquiring a cooling capacity calculation model of the hydrophobic pipeline; wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ，T B Is the saturated steam temperature;
according to the cooling capacity calculation model and the temperature information, calculating to obtain cooling capacity;
and obtaining the internal leakage quantity of the drain valve according to the cooling capacity so as to realize detection of the internal leakage of the drain valve.
According to the drain valve internal leakage detection method, after the drain valve is closed, the temperature value of the preset temperature measuring point in the drain pipe is kept unchanged after the preset time is elapsed, namely the phase change surface in the drain pipe is not changed any more, the temperature value is recorded, the cooling capacity can be accurately calculated according to the measured temperature information and the cooling capacity calculation model, and the internal leakage of the drain valve is further calculated according to the cooling capacity, so that the accurate detection of the internal leakage of the drain valve is realized; furthermore, only the temperature sensor is required to be arranged at a preset temperature measuring point, a plurality of temperature sensors are not required to be arranged, and temperature values measured by the temperature sensors are not required to be recorded at any time, so that the internal leakage amount calculation efficiency can be improved, and meanwhile, the detection cost is reduced.
In one embodiment, the step of calculating and obtaining the cooling capacity according to the cooling capacity calculation model and the temperature information includes: obtaining a relation curve of cooling capacity-temperature according to the cooling capacity calculation model; and inputting the temperature information into the relation curve to obtain the cooling capacity.
In one embodiment, the step of obtaining a cooling capacity-temperature relationship according to the cooling capacity calculation model includes: acquiring the relation of the temperature change of the preset temperature measuring point along with time from closing the drain valve on the premise that the drain valve is not leaked; and obtaining a cooling capacity-temperature relation curve according to the cooling capacity calculation model and the relation of the temperature change along with time.
In one embodiment, the preset temperature measuring point is located at a theoretical phase change surface of the hydrophobic pipeline.
In one embodiment, the preset temperature measuring point is located under the condition that the drain pipe does not leak, and when the temperature of the drain pipe reaches the ambient temperature, the phase change surface is located.
In one embodiment, the step of obtaining a cooling capacity calculation model includes: obtaining a maximum cooling capacity calculation model of the hydrophobic pipeline; and obtaining the cooling capacity calculation model according to the maximum cooling capacity calculation model.
In one embodiment, the expression of the maximum cooling capacity calculation model is:
wherein T is 0 At t 0 The temperature of the temperature measuring point is preset at the moment.
In one embodiment, a drain valve leak detection apparatus is provided, the apparatus comprising:
the temperature information acquisition module is used for acquiring temperature information of a preset temperature measuring point in the drain pipeline, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when the drain valve is in a closed state;
the cooling capacity model acquisition module is used for acquiring a cooling capacity calculation model of the hydrophobic pipeline; wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ，T B Is the saturated steam temperature;
the calculation module is used for calculating and obtaining the cooling capacity according to the cooling capacity calculation model and the temperature information;
and the internal leakage amount acquisition module is used for obtaining the internal leakage amount of the drain valve according to the cooling capacity so as to realize the detection of the internal leakage of the drain valve.
According to the drain valve internal leakage detection device, after the drain valve is closed, the temperature value of the preset temperature measuring point in the drain pipe is kept unchanged after the preset time is elapsed, namely the phase change surface in the drain pipe is not changed any more, the temperature value is recorded, the cooling capacity can be accurately calculated according to the measured temperature information and the cooling capacity calculation model, and the internal leakage of the drain valve is further calculated according to the cooling capacity, so that the accurate detection of the internal leakage of the drain valve is realized; furthermore, only the temperature sensor is required to be arranged at a preset temperature measuring point, a plurality of temperature sensors are not required to be arranged, and temperature values measured by the temperature sensors are not required to be recorded at any time, so that the internal leakage amount calculation efficiency can be improved, and meanwhile, the detection cost is reduced.
In one embodiment, a computer device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any of the embodiments above when the computer program is executed.
In one embodiment, a computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of the embodiments described above.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting leakage in a trap according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a thermal power plant drainage system according to an embodiment;
FIG. 3 is a schematic flow chart of a method for detecting leakage in a trap according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for detecting leakage in a trap according to an embodiment of the present invention;
FIG. 5 is a graph of cooling capacity versus temperature in one embodiment of the invention;
FIG. 6 is a schematic flow chart of a method for detecting leakage in a trap according to an embodiment of the present invention;
fig. 7 is an internal structural view of a computer device according to an embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
For example, there is provided a drain valve leak detection method comprising:
acquiring temperature information of a preset temperature measuring point in a drain pipe, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when a drain valve is in a closed state;
acquiring a cooling capacity calculation model of the hydrophobic pipeline; wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ,T B Is the saturated steam temperature;
according to the cooling capacity calculation model and the temperature information, calculating to obtain cooling capacity;
and obtaining the internal leakage quantity of the drain valve according to the cooling capacity so as to realize detection of the internal leakage of the drain valve.
According to the drain valve internal leakage detection method, after the drain valve is closed, the temperature value of the preset temperature measuring point in the drain pipe is kept unchanged after the preset time is elapsed, namely the phase change surface in the drain pipe is not changed any more, the temperature value is recorded, the cooling capacity can be accurately calculated according to the measured temperature information and the cooling capacity calculation model, and the internal leakage of the drain valve is further calculated according to the cooling capacity, so that the accurate detection of the internal leakage of the drain valve is realized; furthermore, only the temperature sensor is required to be arranged at a preset temperature measuring point, a plurality of temperature sensors are not required to be arranged, and temperature values measured by the temperature sensors are not required to be recorded at any time, so that the internal leakage amount calculation efficiency can be improved, and meanwhile, the detection cost is reduced.
Referring to FIG. 1, in one embodiment, a method for detecting leakage in a trap, the method comprising:
s100, acquiring temperature information of a preset temperature measuring point in a drain pipeline, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when the drain valve is in a closed state.
Specifically, the preset temperature measuring point is provided with a temperature detector, and the temperature detector can be a temperature sensor or other devices capable of detecting temperature. And acquiring temperature information of a preset temperature measuring point in the drainage pipeline, namely acquiring the temperature information of the preset temperature measuring point through a temperature sensor. After the drain valve is switched from the open state to the closed state, steam in the drain pipeline can exchange heat with the environment through the pipe wall and the heat insulation layer, so that the temperature in the drain pipeline is gradually reduced, and when the condensation quantity in the drain pipeline is equal to the sum of the evaporation quantity and the internal leakage quantity, the temperature in the drain pipeline can be maintained at a constant value and is not changed, and the temperature value is recorded, so that the temperature information is obtained. In this embodiment, the temperature of the preset temperature measuring point is maintained at a constant value, which is understood to mean that the variation range of the temperature is smaller than a preset threshold value, for example, the variation range is smaller than ±0.5°.
S110, acquiring a cooling capacity calculation model of the hydrophobic pipeline; wherein, the expression of the cooling capacity calculation model is:
wherein Z is n "Cooling capacity, E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ,T B Is the saturated steam temperature.
Specifically, the cooling capacity refers to the amount of heat energy dissipated to the environment by the thermal medium in unit time through the thermal pipeline and the heat insulation layer when the thermal pipeline is filled with the thermal medium. The cooling capacity in this embodiment is based on how much superheated steam is cooled to the amount of heat energy released by saturated water at the corresponding pressure. It can also be said how much superheated steam can be condensed into saturated water at the corresponding pressure per unit time.
Further, according to the definition of the cooling capacity, the magnitude of the cooling capacity is related to the pipeline parameter, the environment parameter, the heat insulation layer parameter and the steam parameter; for the same hydrophobic pipe, the pipe parameters and the insulating layer parameters are relatively fixed, that is, the total cooling capacity in formula (1) is relatively fixed for one hydrophobic pipe, and the total cooling capacity can be obtained according to the relevant parameters of the hydrophobic pipe, which is not described in detail in this embodiment.
Specifically, the saturated steam temperature in the formula (1) is related to the pressure in the pipe, and the value of the saturated steam temperature is different from the pressure in the pipe. It should be understood that the existing DCS (distributed control system, distributed and decentralized control system) system of the power plant or the pressure sensor on the intelligent valve (i.e. the drain valve) can obtain the saturated steam temperature under the current pressure by combining the pressure value measured by the pressure sensor with the relationship between saturated steam pressure and temperature or the saturated steam pressure temperature comparison table.
The definition domain in formula (1) is [0, n ]]T, i.e n >T B Because if the time parameter T is greater than n, then a negative molecular value, T, will occur n -T B And < 0, the obtained cooling capacity is smaller than a negative value of zero, and if the cooling capacity is smaller than zero, the physical meaning represented by the cooling capacity is that the heat of the heating power pipeline in the absorption environment, which has the objection fact.
And S120, calculating and obtaining the cooling capacity according to the cooling capacity calculation model and the temperature information.
Specifically, according to the formula (1), the cooling capacity is related to the temperature measured by the preset temperature measuring point, so that the cooling capacity can be calculated according to the cooling calculation model and the temperature information. Further, for T in formula (1) n I.e. corresponding to said temperature information; for the n value acquisition, that is, when the preset temperature measuring point starts to be maintained at a constant value, in an embodiment, the temperature of the preset temperature measuring point may be monitored in real time by a temperature sensor set by the preset temperature measuring point, so as to determine when the temperature of the preset temperature measuring point starts to be maintained at a constant value, so as to acquire the n value. In another embodiment, when the internal leakage of the drainage pipeline does not occur, a relationship of temperature change of a preset temperature measuring point along with time is obtained; obtaining according to the cooling capacity calculation model and the relation of the temperature change along with timeCooling capacity versus temperature; and inputting the temperature information into the relation curve to obtain the cooling capacity.
S130, obtaining the internal leakage of the drain valve according to the cooling capacity so as to realize detection of the internal leakage of the drain valve.
Specifically, fig. 2 shows a schematic structural diagram of a drainage system of a thermal power plant, when a drain valve 4 completes drainage, a valve is closed and no internal leakage occurs, steam is conveyed to a drain pipe 5 by a steam pipe 1, the steam in the drain pipe 5 is subjected to heat exchange with the environment through a pipe wall and a heat insulation layer, the steam in the drain pipe is gradually cooled into water, the water is firstly accumulated at the bottom of the drain pipe, an interface between the steam and the water is formed in the drain pipe, namely a phase-change surface 2, and a temperature measuring point 3 is arranged at the phase-change surface to realize detection of the temperature in the drain pipe.
The reasonable drainage pipeline is a pipeline with only one passage between the drain valve and the main steam main pipe after the drain valve is closed, and for the reasonable drainage pipeline with no internal leakage of the drain valve, when the reasonable drainage pipeline reaches a final heat balance state, the phase change surface moves to a specific position and keeps still, and the phase change surface is called a theoretical phase change surface position; that is to say, when the hydrophobic pipeline is not internally leaked, the position maintained by the phase change surface is called a theoretical phase change surface.
Under the condition that the drain valve has no internal leakage, the cooling capacity of the thermodynamic system is maximum at the moment after the valve is closed, then the temperature of the pipeline wall starts to be reduced along with the heat exchange between the high-temperature pipeline and the environment, the cooling capacity of the system also starts to be reduced, condensed water can appear in the pipeline gradually along with the time, and at the moment, the cooling capacity is also continuously reduced because the temperature difference between the pipeline wall and the environment is continuously reduced; then, as time goes on, the concentration of condensed water in the heating power pipeline can generate a phase change surface; and as the phase change surface is continuously increased, the cooling capacity is continuously reduced, and finally, the cooling capacity finally becomes zero. That is, when the drain valve does not leak, the actual phase change surface and the theoretical phase change surface in the drain pipeline are equal; the actual phase change surface refers to the position of the phase change surface when the phase change surface in the hydrophobic pipeline is not changed any more. When the actual phase change surface is equal to the theoretical phase change surface, the cooling capacity of the drainage pipeline is zero, namely, the capacity of the drainage pipeline and the microenvironment around the pipeline to condense steam in the pipeline into water is equal to the capacity of the steam flowing in the steam main pipe to heat the drainage pipeline so as to continuously evaporate the condensed water in the phase change surface. Therefore, the cooling capacity being zero means that the evaporation amount of the water drain pipe is equal to the condensation amount of the water drain pipe.
When the valve is closed, the cooling capacity will change from maximum to zero; during this phase change surface change, the cooling capacity is a variable. When there is no change in the parameters of the pipe, the environmental parameters, the insulating layer parameters and the steam parameters, there is a functional relationship between the cooling capacity and the temperature or time at a particular point on the pipe. Then under the condition that other parameters are not changed, the following relationship exists between the condensation, evaporation and internal leakage of water and steam in the heating power pipeline and the phase change surface in the heating power pipeline:
when the condensation quantity is equal to the sum of the evaporation quantity and the internal leakage quantity, the phase change surface is kept unchanged; when the condensation amount is larger than the sum of the evaporation amount and the internal leakage amount, the phase change surface is in a rising state; when the condensation amount is smaller than the sum of the evaporation amount and the internal leakage amount, the phase change surface is in a descending state. It can be seen that the phase change surface in the thermodynamic pipe is not changed any more: the condensation amount is equal to the sum of the evaporation amount and the inner leakage amount, and the cooling capacity is equal to the sum of the condensation amount and the evaporation amount according to the definition of the cooling capacity; and then the cooling capacity, i.e. the internal leakage, can be deduced. Thus, the obtained cooling capacity corresponds to the obtained internal leakage; the detection of leakage in the drain valve can be realized. The condensation amount refers to the condensation amount per unit time of the water drain pipe, and the evaporation amount refers to the evaporation amount per unit time of the water drain pipe.
It will be appreciated that when no phase change surface is found on the thermodynamic pipe before the valve, it is stated that the amount of steam flowing through this thermodynamic pipe is already greater than the cooling capacity of this thermodynamic pipe; if the valve is closed at this time, the internal leakage of the valve is caused, and the internal leakage of the valve is larger than the cooling capacity of the heating pipeline; the drain valve has large internal leakage, obvious corresponding internal leakage performance characteristics and no need of detection. The internal leakage detection method of the drain valve provided by the embodiment can accurately detect the internal leakage when the drain valve has extremely small internal leakage, and has positive significance for safe, economic and environment-friendly operation of a thermodynamic system.
According to the drain valve internal leakage detection method, after the drain valve is closed, the temperature value of the preset temperature measuring point in the drain pipe is kept unchanged after the preset time is elapsed, namely the phase change surface in the drain pipe is not changed any more, the temperature value is recorded, the cooling capacity can be accurately calculated according to the measured temperature information and the cooling capacity calculation model, and the internal leakage of the drain valve is further calculated according to the cooling capacity, so that the accurate detection of the internal leakage of the drain valve is realized; furthermore, only the temperature sensor is required to be arranged at a preset temperature measuring point, a plurality of temperature sensors are not required to be arranged, and temperature values measured by the temperature sensors are not required to be recorded at any time, so that the internal leakage amount calculation efficiency can be improved, and meanwhile, the detection cost is reduced.
In one embodiment, the drain valve internal leakage detection method further comprises the following steps: and overhauling or maintaining the drain valve according to the internal leakage. In one embodiment, according to the internal leakage, when the internal leakage is greater than a preset value, the drain valve is overhauled or maintained. Specifically, when the internal leakage is greater than a preset value, the internal leakage of the drain valve can influence the normal operation of a drainage system of the thermal power plant, and safety accidents and economic losses caused by internal leakage of the drain valve are avoided by overhauling or maintaining the drain valve in time.
In order to facilitate the calculation of the cooling capacity, referring to fig. 3, in one embodiment, the step of calculating the cooling capacity according to the cooling capacity calculation model and the temperature information includes:
s131, obtaining a relation curve of cooling capacity and temperature according to the cooling capacity calculation model.
And S132, inputting the temperature information into the relation curve to obtain the cooling capacity.
Specifically, the cooling capacity can be calculated by acquiring a relation curve of the cooling capacity and the temperature, namely acquiring a function of the cooling capacity and the temperature, so that the cooling capacity can be calculated by inputting variable temperature information, and the calculated value of the cooling capacity can be accurately calculated to a specific value without being estimated in a certain enough range while the calculation of the cooling capacity is convenient.
Referring to fig. 4, in one embodiment, the step of obtaining a cooling capacity-temperature relationship according to the cooling capacity calculation model,
s1311, obtaining the relation of the temperature change of the preset temperature measuring point along with time from closing the drain valve on the premise that the drain pipe is not internally leaked.
Specifically, on the premise that internal leakage does not occur in the drainage pipeline, the relation of the temperature change of the preset temperature measuring point along with time is obtained from the closing of the drainage valve, namely, the time-temperature relation measured at the preset temperature measuring point on the reasonable drainage pipeline is obtained. That is, on the premise that the drain valve is closed, the cooling capacity gradually decreases from the maximum value to zero from the drain valve without internal leakage, and the time-temperature relationship is obtained by acquiring the time-dependent temperature relationship of the temperature measuring point when the cooling capacity decreases from the maximum value to zero. It should be noted that, for a unified drain pipe, the pipe parameters, the heat insulating layer parameters and the steam parameters are the same, and the change relation between the temperature of the preset temperature measuring point and the time is relatively fixed under the condition that the external environment is the same, so that the rate of temperature change is not changed due to internal leakage of the drain valve; the temperature dependence can thus be obtained by means of preliminary experimental data.
S1312, obtaining a cooling capacity-temperature relation curve according to the cooling capacity calculation model and the relation of the temperature change along with time.
Specifically, each group of data in the relation of temperature change along with time is input into a cooling capacity calculation model, and the temperature T measured by a preset temperature point can be obtained n The corresponding cooling capacity can be further matched into the cooling capacity-temperature according to each group of dataThe cooling capacity corresponding to each temperature can be obtained by the relation curve. And further inputting the temperature measured by the preset temperature measuring point into a value relation curve to obtain a specific numerical value of the cooling capacity. It can be appreciated that in this embodiment, as long as the temperature of the temperature measuring point is obtained and maintained at the constant value, it is not necessary to record the temperature change of each time period in real time, and the accuracy of the cooling capacity calculation can be improved while the measurement is convenient.
The following is a specific set of experimental data, calculated from the measured temperature data on the sensor per minute, as shown in table 2 below:
| t (time) | 0 | 1 | 2 | 3 | 4 |
| T (temperature) | 530 | 517 | 504 | 499 | 493 |
| Z n ″ | 16.482 | 15.255 | 14.053 | 13.591 | 13.036 |
| t (time) | 5 | 6 | 7 | 8 | 9 |
| T (temperature) | 488 | 482 | 477 | 471 | 466 |
| Z n ″ | 12.574 | 12.019 | 11.557 | 11.002 | 10.554 |
| t (time) | 15 | 16 | 17 | 18 | 19 |
| T (temperature) | 434 | 428 | 423 | 417 | 412 |
| Z n ″ | 7.5811 | 7.0264 | 6.5641 | 6.0094 | 5.5472 |
| t (time) | 20 | 21 | 22 | 23 | 24 |
| T (temperature) | 406 | 401 | 395 | 390 | 384 |
| Z n ″ | 4.9925 | 4.5302 | 3.9754 | 3.5132 | 2.9585 |
| t (time) | 25 | 26 | 27 | 28 | 29 |
| T (temperature) | 378 | 373 | 368 | 362 | 357 |
| Z n ″ | 2.4038 | 1.9415 | 1.4792 | 0.9245 | 0.4623 |
| t (time) | 30 | ||||
| T (temperature) | 352 | ||||
| Z n ″ | 0 |
Table 2 shows data between cooling capacity and temperature
Furthermore, according to the data in table 2, a cooling capacity-temperature relation curve can be fitted, and the fitted cooling capacity-temperature curve is shown in fig. 5, and is simpler when there is internal leakage and internal leakage in the operation of the high-pressure valve at the supervision temperature. For example, the temperature on the temperature sensor is not changed any more at 488 ℃ (of course, along with small fluctuation of the main steam pressure and the temperature, the temperature measured on the sensor also fluctuates at about 488 ℃), so that the internal leakage of the high-end valve is not only indicated, but also the internal leakage of the valve can be known to be 12.57Kg/h according to the curve, and the monitoring work of the internal leakage and the internal leakage of the high-temperature high-pressure valve is simplified.
In one embodiment, temperature information of a preset temperature measurement point in the drainage pipeline is obtained, namely the temperature measurement point is arranged at the preset position in the drainage pipeline, so that the temperature measured by the preset temperature measurement point is greater than the saturated steam temperature under the current pressure. Specifically, by setting the temperature measuring point at a preset position, the temperature value measured by the temperature measuring point is prevented from being greater than the saturated steam temperature, i.e. the temperature measured by the temperature measuring point is within { T } 0 、T B Within } a range; it should be understood that { T }, as described in the present embodiment 0 、T B The range is that when the drain valve is closed, the temperature in the drain pipeline is controlled by T 0 Down to T B Is defined by the range of (2); and further, the cooling capacity is prevented from being calculated to obtain a negative value, so that the cooling capacity obtained by subsequent calculation is equal to the actual cooling capacity.
In order to better ensure that the temperature measured by the temperature measuring point is greater than the saturated steam temperature, in one embodiment, the preset temperature measuring point is located on the theoretical phase change surface of the drainage pipeIs positioned at the position of the base. Specifically, when the temperature measured by the preset temperature measuring point is smaller than the saturated steam temperature, the cooling capacity is negative, and the objectivity is violated. In order to avoid this phenomenon, the cooling capacity of the hydrophobic pipe is calculated accurately. Through setting the preset temperature measuring point at the theoretical phase change surface of the drainage pipeline, namely arranging the temperature sensor at the theoretical phase change surface or at the position of a point upwards from the theoretical phase change surface, the temperature measured by the preset temperature measuring point is the temperature of steam, and the interference of water is avoided, so that the temperature measured by the temperature measuring point can be better ensured to be higher than the saturated steam temperature, namely the occurrence of T can be avoided n -T B The phenomenon of < 0, the calculated cooling capacity does not appear to be less than zero. Further described below, since the thermal power generating unit has complete and accurate pressure supervision on the main steam pressure, according to the physical property of water, the corresponding saturated steam temperature is found through the relationship between the saturated steam pressure and the temperature, and the temperature is the phase change surface temperature, if the temperature sensor is arranged at the position of the theoretical phase change surface, the temperature will not drop after the temperature sensor drops to the phase change surface temperature, and as long as the valve does not leak inwards, the T-shaped valve will finally appear n -T B Phenomenon of=0. Therefore, the temperature measured by the temperature measuring point can be ensured to be larger than the saturated steam temperature by setting the preset temperature measuring point at the theoretical phase change surface, and the accurate measurement of the cooling capacity can be realized. Furthermore, the cooling capacity change condition of the whole thermal drainage pipeline can be measured only by arranging one temperature sensor at a preset test point, and the temperature of the drainage pipeline is not required to be monitored in real time by arranging a plurality of temperature sensors, so that the production and manufacturing cost can be reduced. The above embodiments have been described in detail for the definition of the theoretical phase transition surface, and the explanation thereof will not be repeated in this embodiment.
In one embodiment, the preset temperature measuring point is located under the condition that the drain pipe does not leak, and when the temperature of the drain pipe reaches the ambient temperature, the phase change surface is located. Specifically, the position of the preset test point in this embodiment, that is, the position where the drain pipe finally reaches the ambient temperature in the state of no internal leakage, orSlightly forward. It should be noted that when the position of the preset temperature measuring point is set to the position indicated by the present embodiment, the total cooling capacity E in the formula (1) is different in physical meaning, and the saturated steam temperature T B Also becomes the ambient temperature T h . On the same drainage pipeline, the cooling capacity calculated by setting the preset temperature measuring point at the position is equal to the cooling capacity calculated by setting the theoretical phase change surface at the preset temperature measuring point, so that the preset temperature measuring point is arranged at the position where the phase change surface is positioned when the temperature of the drainage pipeline reaches the ambient temperature under the condition that the drainage pipeline is not internally leaked, the temperature of any position in the front of the drainage pipeline is higher than the room temperature, and the temperature of the temperature measuring point can not be reduced to T B Hereinafter, T is not caused to occur n -T B The phenomenon of < 0, i.e. the phenomenon that the cooling capacity is less than zero does not occur. Therefore, the cooling capacity change condition of the whole thermal drain pipeline can be measured only by arranging one temperature sensor at the preset test point, and the accurate detection of the leakage quantity in the drain valve can be realized.
To better acquire the cooling capacity calculation model, in one embodiment, the step of acquiring the cooling capacity calculation model includes:
s111, acquiring a maximum cooling capacity calculation model of the hydrophobic pipeline.
In one embodiment, the expression of the maximum cooling capacity calculation model is:
wherein T is 0 At t 0 Presetting the temperature of a temperature measuring point at the moment, Z max Is the maximum cooling capacity.
Specifically, the maximum cooling capacity refers to the heat emitted to the environment per unit time of the whole thermal pipeline when the thermal pipeline is filled with the steam with the highest rated parameter. As can be seen from the formula (2), the unit of maximum cooling capacity is kg/hr, which means that: refers to a thermodynamic drainage system in a specific state, namely, in normal drainage, how many kilograms of superheated steam with specific pressure and temperature can be condensed into saturated condensate corresponding to the pressure in each hour. Further, the acquisition of the maximum cooling capacity belongs to the prior art, and is not described in detail in this embodiment.
And S112, obtaining the cooling capacity calculation model according to the maximum cooling capacity calculation model.
Specifically, according to the content of the formula (2), the definition field is [0, n ], because if the time parameter t is greater than n, a negative molecular value occurs, and therefore, according to the content of the formula (2), it is desired to know the cooling capacity at any temperature obtained on the sensor within the definition field of the function, the formula (2) can be changed to the expression of the formula (1), and thus the cooling capacity calculation model can be obtained.
In one embodiment, a drain valve leak detection apparatus is provided, the apparatus comprising:
the temperature information acquisition module is used for acquiring temperature information of a preset temperature measuring point in the drain pipeline, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when the drain valve is in a closed state;
the cooling capacity model acquisition module is used for acquiring a cooling capacity calculation model of the hydrophobic pipeline; wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment, T B Is the saturated steam temperature;
the calculation module is used for calculating and obtaining the cooling capacity according to the temperature information based on the cooling capacity calculation model;
and the internal leakage amount acquisition module is used for obtaining the internal leakage amount of the drain valve according to the cooling capacity so as to realize the detection of the internal leakage of the drain valve.
According to the drain valve internal leakage detection device, after the drain valve is closed, the temperature value of the preset temperature measuring point in the drain pipe is kept unchanged after the preset time is elapsed, namely the phase change surface in the drain pipe is not changed any more, the temperature value is recorded, the cooling capacity can be accurately calculated according to the measured temperature information and the cooling capacity calculation model, and the internal leakage of the drain valve is further calculated according to the cooling capacity, so that the accurate detection of the internal leakage of the drain valve is realized; furthermore, only the temperature sensor is required to be arranged at a preset temperature measuring point, a plurality of temperature sensors are not required to be arranged, and temperature values measured by the temperature sensors are not required to be recorded at any time, so that the internal leakage amount calculation efficiency can be improved, and meanwhile, the detection cost is reduced.
In one embodiment, the drain valve internal leakage detection device comprises corresponding modules for realizing the steps of the drain valve internal leakage detection method. In one embodiment, the drain valve internal leakage detection device is implemented by adopting the drain valve internal leakage detection method in any one of the embodiments.
In one embodiment, a computer device is provided, the internal structure of which may be as shown in FIG. 7. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a drain valve leak detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 7 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device comprises a memory storing a computer program and a processor that when executing the computer program performs the steps of:
acquiring temperature information of a preset temperature measuring point in a drain pipe, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when a drain valve is in a closed state;
acquiring a cooling capacity calculation model of the hydrophobic pipeline; wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ，T B Is the saturated steam temperature;
according to the cooling capacity calculation model and the temperature information, calculating to obtain cooling capacity;
and obtaining the internal leakage quantity of the drain valve according to the cooling capacity so as to realize detection of the internal leakage of the drain valve.
In one embodiment, the processor, when executing the computer program, implements the steps of the drain valve leak detection method in any of the embodiments described above.
In one embodiment, a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring temperature information of a preset temperature measuring point in a drain pipe, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when a drain valve is in a closed state;
acquiring a cooling capacity calculation model of the hydrophobic pipeline; wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ，T B Is the saturated steam temperature;
according to the cooling capacity calculation model and the temperature information, calculating to obtain cooling capacity;
and obtaining the internal leakage quantity of the drain valve according to the cooling capacity so as to realize detection of the internal leakage of the drain valve.
In one embodiment, the computer program, when executed by a processor, implements the steps of the drain valve leak detection method described in any of the embodiments above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (6)
1. The drain valve internal leakage detection method is characterized by comprising the following steps:
acquiring temperature information of a preset temperature measuring point in a drain pipe, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when a drain valve is in a closed state;
acquiring a cooling capacity calculation model of the hydrophobic pipeline; the step of obtaining the cooling capacity calculation model of the hydrophobic pipeline comprises the following steps:
obtaining a maximum cooling capacity calculation model of the hydrophobic pipeline;
obtaining the cooling capacity calculation model according to the maximum cooling capacity calculation model;
the expression of the maximum cooling capacity calculation model is as follows:
wherein T is 0 At t 0 Presetting the temperature of a temperature measuring point at the moment；
Wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ，T B Is the saturated steam temperature;
according to the cooling capacity calculation model and the temperature information, calculating to obtain cooling capacity; comprising the following steps:
obtaining a relation curve of cooling capacity-temperature according to the cooling capacity calculation model;
inputting the temperature information into the relation curve to obtain the cooling capacity;
acquiring the relation of the temperature change of the preset temperature measuring point along with time from closing the drain valve on the premise that the drain valve is not leaked;
acquiring a cooling capacity-temperature relation curve according to the cooling capacity calculation model and the relation of the temperature change along with time;
according to the cooling capacity, the internal leakage of the drain valve is obtained, so as to realize the detection of the internal leakage of the drain valve.
2. The drain valve internal leakage detection method according to claim 1, wherein the preset temperature measuring point is located on a theoretical phase change surface of the drain pipe.
3. The drain valve internal leakage detection method according to claim 1, wherein the preset temperature measuring point is located at a phase change surface when the temperature of the drain pipe reaches an ambient temperature under the condition that the drain pipe does not leak.
4. The utility model provides a leak detection device in trap which characterized in that includes:
the temperature information acquisition module is used for acquiring temperature information of a preset temperature measuring point in the drain pipeline, wherein the temperature information is a temperature value when the temperature of the preset temperature measuring point is maintained to be a constant value when the drain valve is in a closed state;
the cooling capacity model acquisition module is used for acquiring a cooling capacity calculation model of the hydrophobic pipeline; the step of obtaining the cooling capacity calculation model of the hydrophobic pipeline comprises the following steps:
obtaining a maximum cooling capacity calculation model of the hydrophobic pipeline;
obtaining the cooling capacity calculation model according to the maximum cooling capacity calculation model;
the expression of the maximum cooling capacity calculation model is as follows:
wherein T is 0 At t 0 Presetting the temperature of a temperature measuring point at any time;
wherein, the expression of the cooling capacity calculation model is:
wherein E is total cooling capacity, T n Presetting the temperature of a temperature measuring point at the nth moment and T n >T B ，T B Is the saturated steam temperature;
the calculation module is used for calculating and obtaining the cooling capacity according to the cooling capacity calculation model and the temperature information; comprising the following steps:
obtaining a relation curve of cooling capacity-temperature according to the cooling capacity calculation model;
inputting the temperature information into the relation curve to obtain the cooling capacity;
acquiring the relation of the temperature change of the preset temperature measuring point along with time from closing the drain valve on the premise that the drain valve is not leaked;
acquiring a cooling capacity-temperature relation curve according to the cooling capacity calculation model and the relation of the temperature change along with time;
and the internal leakage amount acquisition module is used for obtaining the internal leakage amount of the drain valve according to the cooling capacity so as to realize the detection of the internal leakage of the drain valve.
5. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 3 when the computer program is executed by the processor.
6. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 3.
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