Leakage flow measuring device and method for high-temperature drain pipeline of thermal power plant

Abstract

The application relates to a high-temperature drain pipeline leakage flow measuring and calculating device and method for a thermal power plant. The device comprises a heat preservation layer surface temperature measuring device, a left side of the heat preservation layer surface temperature measuring device is provided with a drain pipeline inlet outer wall temperature measuring device, a right side of the heat preservation layer surface temperature measuring device is provided with a drain pipeline outlet outer wall temperature measuring device, an upper portion of the heat preservation layer surface temperature measuring device is connected with a connecting rod, a leakage flow calculating component is arranged on the upper portion of the connecting rod, and temperature signals measured by the heat preservation layer surface temperature measuring device, the drain pipeline inlet outer wall temperature measuring device and the drain pipeline outlet outer wall temperature measuring device are sent to the leakage flow calculating component through the connecting rod. The application can quantitatively analyze the economic influence of the drain internal leakage of the thermal power plant, thereby providing a scientific basis for replacing or repairing the drain valve of the thermal power plant.

Description

Technical Field

[0001] This application relates to the field of leakage flow measurement of drainage pipes, and more specifically, to a device and method for measuring leakage flow of high-temperature drainage pipes in thermal power plants. Background Technology

[0002] Internal leakage in steam traps is a common problem in thermal power plants, and it is a significant factor contributing to reduced economic efficiency. Currently, there is no effective solution for leaking steam traps; repair or replacement is generally the only option. However, because the amount of leakage is unknown, thermal power plants cannot accurately assess its impact on unit economics. Determining which steam traps to replace based solely on measurements of pipe wall temperature and diameter lacks scientific rigor and specificity. Summary of the Invention

[0003] The purpose of this application is to provide a device and method for calculating the leakage flow of high-temperature condensate pipes in thermal power plants, which can calculate the leakage flow of high-temperature condensate pipes online, providing a good reference for the economic decision-making of thermal power plants.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] In a first aspect, embodiments of this application provide a leakage flow measurement device for high-temperature condensate drain pipes in thermal power plants, including a surface temperature measuring device for the insulation layer. A condensate drain pipe inlet outer wall temperature measuring device is provided on the left side of the surface temperature measuring device for the insulation layer, and a condensate drain pipe outlet outer wall temperature measuring device is provided on the right side of the surface temperature measuring device for the insulation layer. The upper part of the surface temperature measuring device for the insulation layer is connected to a connecting rod, and a leakage flow calculation component is provided on the upper part of the connecting rod. The temperature signals measured by the surface temperature measuring device for the insulation layer, the condensate drain pipe inlet outer wall temperature measuring device, and the condensate drain pipe outlet outer wall temperature measuring device are sent to the leakage flow calculation component through the connecting rod.

[0006] The temperature measuring structures of the insulation layer surface temperature measuring device, the drainage pipe inlet outer wall temperature measuring device, and the drainage pipe outlet outer wall temperature measuring device are the same. The temperature measuring structure includes two cross-arranged pressure rods, each with a spring at its lower end. One end of the spring is connected to the lower end of the pressure rod, and the other end is connected to an arc-shaped temperature measuring contact surface. The upper ends of the two arc-shaped temperature measuring contact surfaces contact to form a semi-circular temperature measuring structure. A temperature measuring element is installed on the inner wall of the temperature measuring contact surface.

[0007] The temperature sensing element is a patch-type temperature sensor.

[0008] Secondly, embodiments of this application provide a method for calculating the leakage flow of high-temperature condensate pipes in thermal power plants, based on the aforementioned device for calculating the leakage flow of high-temperature condensate pipes in thermal power plants, comprising the following steps:

[0009] Place the device on the drain pipe to be tested, press the push rod, and under the action of the spring, the two temperature measuring contact surfaces will expand. When the range is larger than the pipe or insulation, the temperature measuring contact surfaces will surround the pipe or insulation. Then slowly release the push rod, and the temperature measuring contact surfaces will approach the pipe or insulation until the temperature element touches the pipe or insulation. The insulation layer surface temperature measuring device, the drain pipe inlet outer wall temperature measuring device, and the drain pipe outlet outer wall temperature measuring device are all fastened to the pipe or insulation in this way.

[0010] Activate the leakage flow calculation unit. The unit will display the measured temperatures of various points on the insulation layer and the outer wall temperatures of the inlet and outlet of the drainage pipe. The unit will automatically determine whether the temperature measurements are reasonable. The reasonableness criterion is that the difference between the temperature points measured by the same measuring device does not exceed 30℃. If an abnormality is detected, an alarm will be triggered. After the temperature returns to normal, the unit will prompt you to proceed to the next step, requiring you to select the insulation material and the pressure of the drainage or steam in the pipe. After inputting the insulation material and the pressure of the drainage or steam in the pipe, the unit will calculate and display the leakage flow of the drainage pipe.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] This invention utilizes the wall temperature and insulation temperature of the drainage pipe to calculate the leakage flow of high-temperature drainage pipes online, providing a valuable reference for economic decision-making in thermal power plants. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the measuring device provided in an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the temperature measuring device of this application. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0017] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] The terms “first,” “second,” etc., are used only to distinguish one entity or operation from another, and should not be construed as indicating or implying relative importance, nor as requiring or implying any such actual relationship or order between these entities or operations.

[0019] The embodiments of the present invention provide reference. Figure 1 The leakage flow measurement device for high-temperature drainage pipes in thermal power plants according to the present invention includes: a surface temperature measuring device for the insulation layer 1, an outer wall temperature measuring device for the inlet of the drainage pipe 2, an outer wall temperature measuring device for the outlet of the drainage pipe 3, a connecting rod 4, and a leakage flow calculation component 5.

[0020] The right side of the outer wall temperature measuring device 2 at the inlet of the drainage pipe is connected to the surface temperature measuring device 1 of the insulation layer.

[0021] The left side of the outer wall temperature measuring device 3 at the outlet of the drainage pipe is connected to the surface temperature measuring device 1 of the insulation layer.

[0022] The lower part of the connecting rod 4 is connected to the surface temperature measuring device 1 of the insulation layer, and the upper part of the connecting rod 4 is connected to the leakage flow calculation component 5.

[0023] like Figure 2 As shown, the temperature measuring devices 1 (surface temperature measuring device 1), 2 (inlet outer wall temperature measuring device 2), and 3 (outlet outer wall temperature measuring device 3) of the insulation layer have the same temperature measuring structure. The temperature measuring structure includes two cross-arranged pressure rods, each with a spring at its lower end. One end of the spring is connected to the lower end of the pressure rod, and the other end is connected to an arc-shaped temperature measuring contact surface. The upper ends of the two arc-shaped temperature measuring contact surfaces contact to form a semi-circular temperature measuring structure. A temperature measuring element is installed on the inner wall of the temperature measuring contact surface.

[0024] The temperature sensing element is a patch-type temperature sensor.

[0025] The method for calculating leakage flow of high-temperature condensate pipes in thermal power plants according to the present invention includes the following steps:

[0026] Place the device on the drain pipe to be tested. Secure the insulation layer surface temperature measuring device, the drain pipe inlet outer wall temperature measuring device, and the drain pipe outlet outer wall temperature measuring device to the insulation layer, the drain pipe inlet outer wall, and the drain pipe outlet outer wall, respectively. Driven by the spring, the two temperature measuring contact surfaces expand. When the area exceeds the pipe or insulation, surround the pipe or insulation with the temperature measuring contact surfaces. Then slowly release the pressing rod, allowing the temperature measuring contact surfaces to approach the pipe or insulation until the temperature element touches it. Secure the insulation layer surface temperature measuring device, the drain pipe inlet outer wall temperature measuring device, and the drain pipe outlet outer wall temperature measuring device to the pipe or insulation using the same method. Then activate the leakage flow calculation unit. The leakage flow calculation unit will display the measured temperatures at various points on the insulation layer and the drain pipe inlet and outlet outer wall temperatures. The flow calculation unit will automatically determine if the temperature measurements are reasonable. If an abnormality is detected, an alarm will be triggered. At this point, we need to check and adjust the securing of these three temperature measuring devices. Once the temperature returns to normal, the leakage flow calculation unit will display the next step of the process, prompting you to select the insulation material and the pressure of the pipe drain (or steam). After inputting the insulation material and the pressure of the pipe drain (or steam), the leakage flow calculation unit will calculate the leakage flow of the drain pipe and display it on the flow calculation unit.

[0027] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for calculating the leakage flow of high-temperature condensate drain pipes in thermal power plants, characterized in that, The device for calculating leakage flow of high-temperature drainage pipes in thermal power plants includes a surface temperature measuring device (1) for the insulation layer. A drainage pipe inlet outer wall temperature measuring device (2) is provided on the left side of the surface temperature measuring device (1), and a drainage pipe outlet outer wall temperature measuring device (3) is provided on the right side of the surface temperature measuring device (1). The upper part of the surface temperature measuring device (1) is connected to a connecting rod (4), and a leakage flow calculation component (5) is provided on the upper part of the connecting rod (4). The temperature signals measured by the surface temperature measuring device (1), the drainage pipe inlet outer wall temperature measuring device (2), and the drainage pipe outlet outer wall temperature measuring device (3) are sent to the leakage flow calculation component (5) through the connecting rod (4). The temperature measuring structures of the insulation layer surface temperature measuring device (1), the drainage pipe inlet outer wall temperature measuring device (2), and the drainage pipe outlet outer wall temperature measuring device (3) are the same. The temperature measuring structure includes two cross-arranged pressure rods, and springs are respectively provided at the lower end of the pressure rods. One end of the spring is connected to the lower end of the pressure rod, and the other end is connected to the arc-shaped temperature measuring contact surface. The upper ends of the two arc-shaped temperature measuring contact surfaces contact to form a semi-circular temperature measuring structure. Temperature measuring elements are installed on the inner sidewall of the temperature measuring contact surface. method Includes the following steps: Place the device on the condensate pipe to be tested, press the push rod, and under the action of the spring, the two temperature measuring contact surfaces expand. When the range is larger than the pipe or insulation layer, the temperature measuring contact surfaces surround the pipe or insulation layer. Then slowly release the push rod, and the temperature measuring contact surfaces approach the pipe or insulation layer until the temperature element touches the pipe or insulation layer. The insulation layer surface temperature measuring device (1), the condensate pipe inlet outer wall temperature measuring device (2), and the condensate pipe outlet outer wall temperature measuring device (3) are all fastened to the pipe or insulation layer in this way. Start the leakage flow calculation unit (5). The leakage flow calculation unit (5) will display the measured temperature of each point of the insulation layer and the outer wall temperature of the inlet and outlet of the drainage pipe. The leakage flow calculation unit (5) will automatically judge whether the temperature measurement value is reasonable. The reasonable judgment basis is that the difference between the temperature points measured on the same measuring device does not exceed 30℃. If an abnormality is found, an alarm will be triggered. Once the temperature is normal, the leakage flow calculation component (5) will display the next step of the process, prompting you to select the insulation material and input the pressure of the pipe drain or steam. After inputting the insulation material and the pressure of the pipe drain or steam, the leakage flow calculation component (5) will calculate and display the leakage flow of the drain pipe.

2. The method for calculating leakage flow of high-temperature condensate pipes in thermal power plants according to claim 1, characterized in that, The temperature sensing element is a patch-type temperature sensor.

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