Device and method for measuring and calculating leakage flow of high-temperature drain pipeline of thermal power plant

Abstract

The invention relates to a device and a method for measuring and calculating leakage flow of a high-temperature drain pipeline of a thermal power plant, and the device comprises a thermal insulation layer surface temperature measuring device, and a drain pipeline inlet outer wall temperature measuring device is arranged on the left side of the thermal insulation layer surface temperature measuring device. A drainage pipeline outlet outer wall temperature measuring device is arranged on the right side of the heat preservation layer surface temperature measuring device, and the upper portion of the heat preservation layer surface temperature measuring device is connected with a connecting rod. Temperature signals measured by the thermal insulation 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 calculation component through the connecting rod. The method can support the quantitative analysis of the economic influence of the drainage inner leakage of the thermal power plant, thereby providing a scientific basis for the replacement or maintenance of the drainage valve of the thermal power plant.

Description

Technical Field

[0001] The present application relates to the field of drain pipe leakage flow measurement, and more specifically, to a device and method for measuring the leakage flow of a high-temperature drain pipe in a thermal power plant. Background Art

[0002] The internal leakage of steam traps is a common problem in thermal power plants. It is an important factor that causes the economic decline of thermal power plants. There is no good way to deal with the internal leakage of steam traps. Generally, they are repaired or replaced. Since the amount of internal leakage of steam traps is unknown, thermal power plants cannot accurately grasp the impact of internal leakage on the economic efficiency of the units. It is not scientific and targeted to determine the priority steam trap replacement by measuring factors such as the wall temperature and diameter of the steam trap pipe. Summary of the invention

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

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

[0005] In a first aspect, an embodiment of the present application provides a leakage flow calculation device for a high-temperature drain pipe in a thermal power plant, including an insulation layer surface temperature measuring device, a drain pipe inlet outer wall temperature measuring device is arranged on the left side of the insulation layer surface temperature measuring device, and a drain pipe outlet outer wall temperature measuring device is arranged on the right side of the insulation layer surface temperature measuring device, the upper part of the insulation layer surface temperature measuring device is connected to a connecting rod, and a leakage flow calculation component is arranged on the upper part of the connecting rod, and the temperature signals measured by 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 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 drain pipe inlet outer wall temperature measuring device and the drain pipe outlet outer wall temperature measuring device are the same. The temperature measuring structure includes two cross-arranged pressure rods, and springs are respectively arranged at the lower ends 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 are in contact to form a semicircular temperature measuring structure, and a temperature measuring element is installed on the inner wall of the temperature measuring contact surface.

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

[0008] In a second aspect, an embodiment of the present application provides a method for calculating the leakage flow of a high-temperature drain pipe in a thermal power plant, based on the device for calculating the leakage flow of a high-temperature drain pipe in a thermal power plant as described above, comprising the following steps:

[0009] Place the device on the drain pipe to be tested, press the push rod, and driven by the spring, the two temperature measuring contact surfaces expand. When the range is larger than the pipe or insulation, the temperature measuring contact surface surrounds the pipe or insulation, and then slowly release the push rod, the temperature measuring contact surface approaches 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] Start the leakage flow calculation component, which will display the measured temperatures of each point on the insulation layer and the outer wall temperatures of the inlet and outlet of the drain pipe. The leakage flow calculation component automatically determines 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°C. If an abnormality is found, an alarm will be issued. After the temperature is normal, the leakage flow calculation component will display the next step of the process, prompting you to select the insulation layer material and the pressure of the pipe drain or steam. After entering the insulation layer material and the pressure of the pipe drain or steam, the leakage flow calculation component will calculate the leakage flow of the drain pipe and display it.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention utilizes the wall temperature and insulation temperature of the drain pipe to online measure the leakage flow of the high-temperature drain pipe, thus providing a good reference for the economic decision-making of the thermal power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

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

[0015] Figure 2 This is a schematic diagram of the temperature measurement device of the present application. DETAILED DESCRIPTION

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

[0017] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0018] The terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and should not be understood as indicating or implying relative importance, nor should they be understood 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 rate measuring device for a high-temperature drain pipe of a thermal power plant of the present invention comprises a thermal insulation layer surface temperature measuring device 1, a drain pipe inlet outer wall temperature measuring device 2, a drain pipe outlet outer wall temperature measuring device 3, a connecting rod 4, and a leakage flow rate calculating component 5.

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

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

[0022] The lower part of the connecting rod 4 is connected to the insulation layer surface temperature measuring device 1 , 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 structures of the insulation layer surface temperature measuring device 1, the drain pipe inlet outer wall temperature measuring device 2 and the drain 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 arranged at the lower ends 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 are in contact to form a semicircular temperature measuring structure, and a temperature measuring element is installed on the inner wall of the temperature measuring contact surface.

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

[0025] The method for calculating leakage flow of a high-temperature drain pipe in a thermal power plant according to the present invention comprises the following steps:

[0026] Place the device on the drain pipe to be tested, and fix 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 on the insulation layer, drain pipe inlet outer wall, and drain pipe outlet outer wall of the measuring pipe. Driven by the spring, the two temperature measurement contact surfaces expand. When the range is larger than the pipe or insulation, the temperature measurement contact surface surrounds the pipe or insulation, and then slowly releases the pressing rod. The temperature measurement contact surface approaches 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. Then start the leakage flow calculation component. The leakage flow calculation component will display the measured temperature of each point of the insulation layer and the outer wall temperature of the drain pipe inlet and outlet. The flow calculation component automatically determines whether the temperature measurement value is reasonable. If an abnormality is found, an alarm will be issued. At this time, we need to check and adjust the fixation of the three temperature measurement devices. After the temperature returns to normal, the leakage flow calculation component 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 entering the insulation material and the pressure of the pipe drain (or steam), the leakage flow calculation component will calculate the leakage flow of the drain pipe and display it on the flow calculation component.

[0027] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for calculating leakage flow of high-temperature drain pipes in thermal power plants, characterized in that: The invention comprises a thermal insulation layer surface temperature measuring device (1), wherein a drain pipe inlet outer wall temperature measuring device (2) is arranged on the left side of the thermal insulation layer surface temperature measuring device (1), and a drain pipe outlet outer wall temperature measuring device (3) is arranged on the right side of the thermal insulation layer surface temperature measuring device (1). The upper part of the thermal insulation layer surface temperature measuring device (1) is connected to a connecting rod (4), and a leakage flow calculation component (5) is arranged on the upper part of the connecting rod (4). The temperature signals measured by the thermal insulation layer surface temperature measuring device (1), the drain pipe inlet outer wall temperature measuring device (2), and the drain pipe outlet outer wall temperature measuring device (3) are sent to the leakage flow calculation component (5) through the connecting rod (4).

2. A device for calculating leakage flow of high-temperature drain pipes in thermal power plants according to claim 1, characterized in that: The temperature measuring structures of the insulation layer surface temperature measuring device (1), the drain pipe inlet outer wall temperature measuring device (2) and the drain pipe outlet outer wall temperature measuring device (3) are the same, and the temperature measuring structure comprises two cross-arranged pressure rods, and springs are respectively arranged at the lower ends 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 are in contact to form a semicircular temperature measuring structure, and a temperature measuring element is installed on the inner wall of the temperature measuring contact surface.

3. A device for calculating leakage flow of high-temperature drain pipes in thermal power plants according to claim 1, characterized in that: The temperature measuring element is a patch type temperature sensor.

4. A method for calculating leakage flow of high-temperature drain pipes in thermal power plants, characterized in that: The device for calculating leakage flow of a high-temperature drain pipe in a thermal power plant according to claim 1 comprises the following steps: The device is placed on the drain pipe to be tested, and the pressing rod is pressed. Driven by the spring, the two temperature measuring contact surfaces expand. When the range is larger than the pipe or insulation, the temperature measuring contact surfaces surround the pipe or insulation. Then the pressing rod is slowly released, and the temperature measuring contact surfaces are brought closer to the pipe or insulation until the temperature element touches the pipe or insulation. The insulation layer surface temperature measuring device (1), the drain pipe inlet outer wall temperature measuring device (2) and the drain pipe outlet outer wall temperature measuring device (3) are all fastened to the pipe or insulation in this way. The leakage flow calculation component (5) is started, and the leakage flow calculation component (5) will display the measured temperatures of various points on the insulation layer and the outer wall temperatures of the inlet and outlet of the drain pipe. The leakage flow calculation component (5) automatically determines whether the temperature measurement value is reasonable. The reasonable judgment basis is that the difference between the various temperature points measured on the same measuring device does not exceed 30°C. If an abnormality is found, an alarm will be issued. After the temperature is normal, the leakage flow calculation component (5) will display the next step of the process, prompting the selection of insulation layer materials and the pressure of pipeline drain or steam. After the insulation layer material and the pressure of pipeline drain or steam are input, the leakage flow calculation component (5) will calculate the leakage flow of the drain pipe and display it.

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