Flow calibration device of gas flowmeter

Abstract

The utility model relates to a flow calibration device of a gas flowmeter. The flow calibration device comprises a first water pump; the steam generator is connected with the first water pump and used for converting liquid output by the first water pump into steam; the water-steam separator is connected with the steam generator; the steam flow meter is connected with the water-steam separator, and the steam separated by the water-steam separator flows through the steam flow meter; the heat exchange module is connected with the steam flow meter and is used for carrying out heat exchange on the steam flowing through the steam flow meter; the measuring container is used for accommodating the liquid flowing out of the heat exchange module and weighing the liquid; the water tank is provided with an inlet and an outlet, the inlet is connected with the measuring container, the outlet is connected with the first water pump, and the water-steam separator can perform water-steam separation on steam output by the steam generator and remove liquid water carried in the steam, so that the purity of the steam is improved, and the quality of the steam entering the steam flowmeter is higher; and the flow calibration accuracy of the steam flowmeter is improved.

Description

Technical Field

[0001] This utility model relates to the field of flow measurement technology, specifically to a flow calibration device for a gas flow meter. Background Technology

[0002] A steam flow meter is a flow meter for a special medium, used to measure the flow rate of steam. With the continuous expansion of industrial production scale and the increasing complexity of production processes, higher requirements are placed on the accuracy, reliability, and stability of steam flow measurement. For example, in industries such as chemical, power, and pharmaceutical, accurate control of steam flow is crucial for ensuring product quality, optimizing production processes, and reducing energy consumption. Inaccurate flow measurement can lead to unstable product quality, energy waste, and even equipment failure.

[0003] However, the gas flow devices of steam flow meters currently on the market are simply designed, with low measurement accuracy and low working efficiency.

[0004] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Utility Model Content

[0005] In view of this, the present application provides a flow calibration device for a gas flow meter to solve at least one problem existing in the prior art, comprising:

[0006] First water pump;

[0007] A steam generator, connected to the first water pump, is used to convert the liquid output by the first water pump into steam;

[0008] A water-vapor separator is connected to the steam generator;

[0009] A steam flow meter is connected to the water-steam separator, and the steam separated by the water-steam separator flows through the steam flow meter;

[0010] A heat exchange module is connected to the steam flow meter to perform heat exchange on the steam flowing through the steam flow meter;

[0011] A measuring container for containing and weighing the liquid flowing out of the heat exchange module;

[0012] The water tank has an inlet and an outlet, the inlet being connected to the measuring container and the outlet being connected to the first water pump.

[0013] Optionally, in the above-mentioned flow calibration device for gas flow meters, the heat exchange module includes a heat exchanger connecting the steam flow meter and the measuring container, and a second water pump and a cooling tower connected to the heat exchanger. The second water pump is configured to circulate cooling water in the cooling tower between the heat exchanger and the cooling tower, so that the water vapor flowing through the heat exchanger is converted into liquid.

[0014] Optionally, in the above-described gas flow meter flow calibration device, the heat exchanger has a first inlet and a second inlet, the first inlet connecting the steam flow meter and the measuring container, and the second inlet connecting the second water pump and the cooling tower.

[0015] Optionally, in the above-mentioned flow calibration device for gas flow meters, the heat exchanger is a plate heat exchanger.

[0016] Optionally, the flow calibration device for the gas flow meter described above further includes a valve assembly, which includes a first shut-off valve disposed between the first water pump and the steam generator, a second shut-off valve disposed between the heat exchanger and the measuring container, a third shut-off valve disposed between the measuring container and the water tank, and a fourth shut-off valve disposed between the heat exchanger and the second water pump.

[0017] Optionally, the flow calibration device for the gas flow meter described above further includes a pressure measuring element disposed between the water vapor separator and the steam flow meter, and a temperature measuring element disposed between the steam flow meter and the heat exchanger.

[0018] Optionally, the flow calibration device for the gas flow meter described above further includes a pressure regulating valve disposed between the water vapor separator and the pressure measuring element, and a flow regulating valve disposed between the temperature measuring element and the heat exchanger.

[0019] Optionally, in the above-described gas flow meter flow calibration device, the measuring container includes a receiving container for containing liquid and an electronic scale located below the receiving container.

[0020] Compared with the prior art, this application has the following advantages: by setting a water vapor separator, the separated steam can flow through the steam flow meter, so that the steam flow meter can measure in a relatively pure steam environment, avoiding the interference of liquid water on the measurement, thereby improving the accuracy of calibration. Moreover, the application is equipped with a measuring container and a heat exchange module. The heat exchange module can adjust the temperature and state of the steam, so that the steam is converted into condensate before entering the measuring container, thereby preventing the steam from flowing into the air, further improving the accuracy of calibration. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a flow calibration device for a gas flow meter as shown in this embodiment.

[0022] Figure description: First water pump 1, steam generator 2, water-steam separator 3, steam flow meter 4, heat exchange module 5, heat exchanger 51, second water pump 52, cooling tower 53, measuring container 6, water tank 7, first shut-off valve 81, second shut-off valve 82, third shut-off valve 83, fourth shut-off valve 84, pressure regulating valve 91, flow regulating valve 92, pressure measuring element 93, temperature measuring element 94. Detailed Implementation

[0023] The exemplary embodiments disclosed in this application will now be described in more detail. Numerous specific details are set forth in the following description to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without one or more of these details. In other instances, to avoid confusion with this application, some technical features well-known in the art have not been described; that is, not all features of actual embodiments are described herein, nor are well-known functions and structures described in detail.

[0024] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this application, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion. And the discussion of a second element, component, area, layer, or portion does not imply that the first element, component, area, layer, or portion necessarily exists in this application.

[0025] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used here for convenience to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of devices in use and operation.

[0026] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “compose” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0027] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0028] Please refer to Figure 1 As shown in the preferred embodiment of this application, a flow calibration device for a gas flow meter is provided for calibrating a gas flow meter. In this embodiment, the gas flow meter to be calibrated is a steam flow meter, thereby calibrating the steam flow meter. The calibration device includes a first water pump 1, a steam generator 2 connected to the first water pump 1, a water-vapor separator 3 connected to the steam generator 2, a steam flow meter 4 connected to the water-vapor separator 3, a heat exchange module 5 and a measuring container 6 connected to the steam flow meter 4, and a water tank 7. The first water pump 1 pumps liquid into the steam generator 2, the steam generator 2 converts the liquid output from the first water pump 1 into steam, the water-vapor separator 3 separates the steam output from the steam generator 2 into water and vapor, the heat exchange module 5 performs heat exchange on the steam flowing through the steam flow meter 4 to convert the steam through the steam flow meter 4 into liquid water, the measuring container 6 contains and weighs the liquid water flowing out from the heat exchange module 5, and the water tank 7 has an inlet and an outlet; the inlet is connected to the measuring container 6, and the outlet is connected to the first water pump 1.

[0029] Understandably, by setting up a steam generator 2 and a water-vapor separator 3, the water-vapor separator 3 can separate the steam output from the steam generator 2, remove the liquid water carried in the steam, thereby improving the purity of the steam, so that the quality of the steam entering the steam flow meter 4 is higher and closer to the steam state measured by the steam flow meter 4 in actual industrial applications, thereby improving the accuracy of the flow calibration of the steam flow meter 4.

[0030] Understandably, by setting up the heat exchange module 5, the steam flowing through the steam flow meter 4 can exchange heat with the low-temperature cooling medium, so that the steam condenses into liquid water. This makes it easier for the measuring container 6 to weigh the liquid water, thereby indirectly measuring the mass of the steam flowing through the steam flow meter 4. This avoids the inability to measure the mass of the steam due to various factors such as density, temperature, and pressure.

[0031] Understandably, by connecting the water tank 7 to the first water pump 1, the liquid water calibrated by the steam flow meter 4 can continue to be supplied to the first water pump 1, thus forming a cycle for the entire calibration device. This not only avoids water waste but also makes the calibration device more environmentally friendly.

[0032] It should be noted that in this embodiment, a filter is also provided between the water tank 7 and the first water pump 1 to remove impurities and ensure the quality of the liquid water at the output end of the first water pump 1.

[0033] Specifically, the heat exchange module 5 includes a heat exchanger 51 connecting the steam flow meter 4 and the measuring container 6, a second water pump 52 connected to the heat exchanger 51, and a cooling tower 53. The second water pump 52 is configured to circulate the cooling water in the cooling tower 53 between the heat exchanger 51 and the cooling tower 53, so that the water vapor flowing through the heat exchanger 51 is converted into liquid, thereby realizing the recycling of cooling water without the need for frequent addition of cooling water, enabling the steam to be efficiently converted into liquid water, and improving the heat exchange efficiency.

[0034] More specifically, the heat exchanger 51 has a first inlet and a second inlet. The first inlet is connected to the steam flow meter 4 and the measuring container 6, and the second inlet is connected to the second water pump 52 and the cooling tower 53, so that steam and cooling water can be immersed into the heat exchanger 51 from different inlets, preventing the media from mixing and ensuring high efficiency and stability in the heat exchange process.

[0035] In this embodiment, the heat exchanger 51 is a plate heat exchanger 51. The plate heat exchanger 51 not only has high heat transfer performance, but also has a compact structure, reducing the floor space occupied by the calibration device.

[0036] The measuring container 6 includes a container for containing liquid and an electronic scale located below the container. The electronic scale is connected to a controller to transmit the measured mass of liquid water in the container to the controller, thereby enabling automatic calibration of the steam flow meter 4.

[0037] In this embodiment, the calibration device further includes a valve assembly, which includes a first shut-off valve 81 disposed between the first water pump 1 and the steam generator 2, a second shut-off valve 82 disposed between the heat exchanger 51 and the measuring container 6, a third shut-off valve 83 disposed between the measuring container 6 and the water tank 7, and a fourth shut-off valve 84 disposed between the heat exchanger 51 and the second water pump 52.

[0038] Understandably, by setting multiple shut-off valves, the flow of fluid in each part can be controlled individually, making it convenient to pause the operation of a part during maintenance, repair, or adjustment without affecting the entire calibration device.

[0039] In this embodiment, the calibration device further includes a pressure measuring element 93 disposed between the water vapor separator 3 and the steam flow meter 4 and a temperature measuring element 94 disposed between the steam flow meter 4 and the heat exchanger 51. The pressure measuring element 93 is used to monitor the pressure of the steam in real time, while the temperature measuring element 94 is used to monitor the temperature of the steam in real time, so as to provide a reference for the calibration process.

[0040] Furthermore, the calibration device also includes a pressure regulating valve 91 disposed between the water vapor separator 3 and the pressure measuring element 93 and a flow regulating valve 92 disposed between the temperature measuring element 94 and the heat exchanger 51, so that the pressure and flow rate of the steam entering the steam flow meter 4 can be precisely controlled.

[0041] In summary, the calibration process of the gas flow meter calibration device shown in this embodiment is as follows:

[0042] (1) Open the first shut-off valve, close the second shut-off valve and the third shut-off valve, and start the first water pump. The liquid water in the water tank is pumped into the steam generator by the first water pump. After being heated, it is converted into steam. Then it passes through the water-steam separator to remove the liquid water it carries, and obtain pure single-phase steam. The single-phase steam continues to flow through the pressure regulating valve, steam flow meter, temperature measuring device, flow regulating valve, and then enters the heat exchanger.

[0043] (2) Adjust the pressure regulating valve and the flow regulating valve to make the steam flowing through the steam flow meter reach the required pressure and flow rate, and keep them constant during calibration.

[0044] (3) Open the fourth shut-off valve and start the second water pump to make the heat exchange module run. The cooling water circulates through the second water pump, heat exchanger and cooling tower, so that the heat of the steam is absorbed in the heat exchanger and dissipated in the cooling tower, and finally the steam is condensed into liquid water.

[0045] (4) After the calibration device has been running stably for a period of time, record the reading m0 of the electronic scale, open the second shut-off valve, and start the timer of the steam flow meter at the same time. Liquid water flows into the measuring container along the pipeline.

[0046] (5) After the set time t, close the second shut-off valve and the timer of the steam flow meter. Record the reading m1 of the electronic scale and calculate the mass flow rate q of the condensed liquid water. m :

[0047] ;

[0048] q m This is the standard value of the steam mass flow rate passing through the steam flow meter; record the displayed value q of the steam flow meter. m1 Calculate the indication error at this flow rate point:

[0049] ;

[0050] The flow rate was measured three times, and the average value of the calculated indication error was taken. Then, the average indication error was used to correct the flow rate of the steam flow meter at that point.

[0051] (6) Open the third shut-off valve and the condensed liquid water flows into the water tank.

[0052] (7) Adjust the flow regulating valve to reach the next flow point, repeat the above steps to correct the flow point, and so on, to complete the calibration of the steam flow meter.

[0053] The above is only one specific implementation of this application, and any other improvements made based on the concept of this application shall be considered within the scope of protection of this application.

Claims

1. A flow calibration device for a gas flow meter, characterized in that, include: First water pump; A steam generator, connected to the first water pump, is used to convert the liquid output by the first water pump into steam; A water-vapor separator is connected to the steam generator; A steam flow meter is connected to the water-steam separator, and the steam separated by the water-steam separator flows through the steam flow meter; A heat exchange module is connected to the steam flow meter to perform heat exchange on the steam flowing through the steam flow meter; A measuring container for containing and weighing the liquid flowing out of the heat exchange module; The water tank has an inlet and an outlet, the inlet being connected to the measuring container and the outlet being connected to the first water pump.

2. The flow calibration device for a gas flow meter according to claim 1, characterized in that, The heat exchange module includes a heat exchanger connecting the steam flow meter and the measuring container, and a second water pump and a cooling tower connected to the heat exchanger. The second water pump is configured to circulate cooling water in the cooling tower between the heat exchanger and the cooling tower, so that the water vapor flowing through the heat exchanger is converted into liquid.

3. The flow calibration device for a gas flow meter according to claim 2, characterized in that, The heat exchanger has a first inlet and a second inlet, the first inlet being connected to the steam flow meter and the measuring vessel, and the second inlet being connected to the second water pump and the cooling tower.

4. The flow calibration device for a gas flow meter according to claim 2, characterized in that, The heat exchanger is a plate heat exchanger.

5. The flow calibration device for a gas flow meter according to claim 2, characterized in that, The calibration device further includes a valve assembly comprising a first shut-off valve disposed between the first water pump and the steam generator, a second shut-off valve disposed between the heat exchanger and the measuring container, a third shut-off valve disposed between the measuring container and the water tank, and a fourth shut-off valve disposed between the heat exchanger and the second water pump.

6. The flow calibration device for a gas flow meter according to claim 5, characterized in that, The calibration device also includes a pressure measuring element disposed between the water-vapor separator and the steam flow meter, and a temperature measuring element disposed between the steam flow meter and the heat exchanger.

7. The flow calibration device for a gas flow meter according to claim 6, characterized in that, The calibration device also includes a pressure regulating valve disposed between the water vapor separator and the pressure measuring element, and a flow regulating valve disposed between the temperature measuring element and the heat exchanger.

8. The flow calibration device for a gas flow meter according to claim 1, characterized in that, The measuring container includes a container for containing liquid and an electronic scale located below the container.

Images