Steam quantity lossless metering device

Abstract

The utility model provides a steam quantity lossless metering device, and relates to the technical field of gas metering, the steam quantity lossless metering device comprises a PLC control structure, a main pipeline, a main flow meter, an auxiliary pipeline and an auxiliary flow meter, the main pipeline is provided with a measuring section, the measuring section is provided with a steam inlet end and a steam outlet end, the main flow meter is installed on the measuring section of the main pipeline and is connected with the PLC control structure, and the auxiliary flow meter is connected with the main pipeline. The two ends of the auxiliary pipeline are communicated with the steam inlet end and the steam outlet end of the measuring section respectively, a first electric stop valve is arranged at the position, close to the position communicated with the auxiliary pipeline, of the steam inlet end of the measuring section, a second electric stop valve is arranged at the position, close to the steam inlet end of the measuring section, of the auxiliary pipeline, and the auxiliary flowmeter is installed on the auxiliary pipeline and connected with the PLC control structure. According to the utility model, the auxiliary pipeline and the auxiliary flow meter are arranged to carry out metering switching, the main flow meter is used for metering in the peak using period, and the auxiliary pipeline is switched for measuring in the small-load working condition, so that the steam flow loss caused by metering is reduced, and more accurate metering is realized.

Description

Technical Field

[0001] The present application relates to the technical field of gas metering, and in particular to a lossless steam metering device. Background Art

[0002] Steam metering refers to the measurement and recording of the amount of steam passing through a pipeline. The device that measures steam is called a steam flow meter, which is used to accumulate the volume or mass of steam passing through a pipeline. In steam metering, some users have large fluctuations in peak and low peak steam loads, and the flow is not easy to measure under low load conditions, which can lead to metering losses.

[0003] Therefore, it is necessary to design a steam lossless metering device to better solve the above technical problems. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a lossless steam metering device that can solve the technical problems of lossless metering of gas peak and low peak fluctuations.

[0005] An embodiment of the present application provides a lossless steam metering device, including a PLC control structure, a main pipeline, a main flowmeter, an auxiliary pipeline and an auxiliary flowmeter, the main pipeline is provided with a measuring section, the measuring section has a steam inlet end and a steam outlet end, the main flowmeter is installed in the measuring section of the main pipeline, and is connected to the PLC control structure, the two ends of the auxiliary pipeline are respectively connected to the steam inlet end and the steam outlet end of the measuring section, the steam inlet end of the measuring section is close to the position connected to the auxiliary pipeline, and a first electric stop valve is provided, the auxiliary pipeline is close to the steam inlet end of the measuring section. The auxiliary flowmeter is installed in the auxiliary pipeline and is connected to the PLC control structure.

[0006] Furthermore, the steam inlet end and the steam outlet end of the measuring section are respectively provided with a first manual stop valve.

[0007] Furthermore, second manual stop valves are respectively provided at both ends of the auxiliary pipeline.

[0008] Furthermore, the main flow meter is set to a DN250 steam flow meter, and the auxiliary flow meter is set to a DN100 steam flow meter.

[0009] Furthermore, the steam inlet end and the steam outlet end of the measuring section are respectively provided with three-way pipe fittings, and the auxiliary pipeline is connected with the steam inlet end and the steam outlet end of the measuring section through the three-way pipe fittings.

[0010] Furthermore, the steam inlet and outlet ends of the measuring section and both ends of the auxiliary pipeline are respectively connected to the three-way pipe fitting through flange structures, and sealing gaskets are provided at the connection between the flange structure and the three-way pipe fitting.

[0011] Furthermore, the PLC control structure is provided with a protective box and a control panel, and the control panel is installed in the protective box.

[0012] Beneficial effects of the utility model:

[0013] The utility model provides a steam lossless metering device, including a PLC control structure, a main pipeline, a main flowmeter, an auxiliary pipeline and an auxiliary flowmeter. The main pipeline is provided with a measuring section, and the measuring section has a steam inlet end and a steam outlet end. The main flowmeter is installed in the measuring section of the main pipeline and is connected to the PLC control structure. The two ends of the auxiliary pipeline are respectively connected with the steam inlet end and the steam outlet end of the measuring section. The steam inlet end of the measuring section is close to the position connected with the auxiliary pipeline, and a first electric stop valve is provided. The auxiliary pipeline is close to the steam inlet end of the measuring section. The second electric stop valve is provided. The auxiliary flowmeter is installed in the auxiliary pipeline and is connected to the PLC control structure. The utility model has a simple structure and a reasonable design. The auxiliary pipeline is set and the auxiliary flowmeter is installed to perform metering switching. During peak use, the main flowmeter is used for metering, and the auxiliary pipeline is switched to perform measurement during low load conditions, so as to reduce the steam flow loss caused by metering and achieve more accurate metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments 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.

[0015] Figure 1 It is a schematic diagram of the connection of various structures in some embodiments of the utility model;

[0016] Figure 2 This is a schematic structural diagram of the connection position of the main pipeline and the auxiliary pipeline in some embodiments of the present utility model.

[0017] The reference numerals are:

[0018] PLC control structure 1, protection box 11, control board 12, main pipeline 2, first electric stop valve 21, first manual stop valve 22, main flow meter 3, auxiliary pipeline 4, second electric stop valve 41, second manual stop valve 42, auxiliary flow meter 5, three-way pipe fitting 6, flange structure 7. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] See also Figure 1-Figure 2As shown, the steam lossless metering device described in this embodiment includes a PLC control structure 1, a main pipeline 2, a main flowmeter 3, an auxiliary pipeline 4 and an auxiliary flowmeter 5. The main pipeline 2 is provided with a measuring section, and the measuring section has a steam inlet end and a steam outlet end. The main flowmeter 3 is installed in the measuring section of the main pipeline 2 and is connected to the PLC control structure 1. The two ends of the auxiliary pipeline 4 are respectively connected to the steam inlet end and the steam outlet end of the measuring section. The steam inlet end of the measuring section is close to the position connected to the auxiliary pipeline 4, and a first electric stop valve 21 is provided. The auxiliary pipeline 4 is close to the steam inlet end of the measuring section. A second electric stop valve 41 is provided. The auxiliary flowmeter 5 is installed in the auxiliary pipeline 4 and is connected to the PLC control structure 1.

[0026] This embodiment has a simple structure and a reasonable design. By setting an auxiliary pipeline 4 and installing an auxiliary flow meter 5, metering switching is performed. During peak usage, measurement is performed through the main flow meter 3, and during low load conditions, measurement is switched to the auxiliary pipeline 4 to reduce steam flow loss caused by metering and achieve more accurate metering.

[0027] In the above embodiment, the steam inlet end and the steam outlet end of the measuring section are respectively provided with a first manual stop valve 22 .

[0028] Specifically, the two ends of the auxiliary pipeline 4 are respectively provided with a second manual stop valve 42 .

[0029] In this embodiment, by providing the first manual stop valve 22 and the second manual stop valve 42, manual operation to close the valve is facilitated during maintenance and the like, thereby improving the flexibility of regulation and use.

[0030] In some embodiments, the main flow meter 3 is set to a DN250 steam flow meter, and the auxiliary flow meter 5 is set to a DN100 steam flow meter.

[0031] In this embodiment, the measuring capabilities of the main flow meter 3 and the auxiliary flow meter 5 are specifically shown, so as to realize lossless measurement of steam volume by switching and coordinating the flow meters with two different measuring ranges.

[0032] Specifically, in this embodiment, the DN250 steam flow meter can be used to measure the steam volume above 5t / h, while the DN100 steam flow meter is used to measure the steam volume below 5t / h. When the steam flow rate is greater than 5t / h, the PLC control structure 1 controls the opening of the first electric stop valve 21, and measures it through the main flow meter 3. When the steam flow rate is less than 5t / h, the PLC control structure 1 controls the closing of the first electric stop valve 21 and the opening of the second electric stop valve 41, and measures it by the auxiliary flow meter 5, so as to realize flexible switching and accurate metering.

[0033] In some embodiments, the steam inlet and outlet ends of the measuring section are respectively provided with three-way pipe fittings 6 , and the auxiliary pipeline 4 is connected with the steam inlet and outlet ends of the measuring section through the three-way pipe fittings 6 .

[0034] Specifically, the steam inlet and outlet ends of the measuring section and both ends of the auxiliary pipeline 4 are respectively connected to the three-way pipe fitting 6 through a flange structure 7, and a sealing gasket is provided at the connection between the flange structure 7 and the three-way pipe fitting 6.

[0035] Specifically, the PLC control structure 1 is provided with a protection box 11 and a control board 12 , and the control board 12 is installed in the protection box 11 .

[0036] In this embodiment, by disposing the control board 12 in the protective box 11, the control board 12 can be effectively protected and stable control can be achieved.

[0037] The above are only preferred embodiments of the present application and are not intended to limit 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 steam lossless metering device, characterized in that: It includes a PLC control structure, a main pipeline, a main flowmeter, an auxiliary pipeline and an auxiliary flowmeter. The main pipeline is provided with a measuring section, and the measuring section has a steam inlet end and a steam outlet end. The main flowmeter is installed in the measuring section of the main pipeline and is connected to the PLC control structure. The two ends of the auxiliary pipeline are respectively connected to the steam inlet end and the steam outlet end of the measuring section. The steam inlet end of the measuring section is close to the position connected to the auxiliary pipeline, and a first electric stop valve is provided. The auxiliary pipeline is close to the steam inlet end of the measuring section. A second electric stop valve is provided. The auxiliary flowmeter is installed in the auxiliary pipeline and is connected to the PLC control structure.

2. The steam lossless metering device according to claim 1 is characterized in that: The steam inlet end and the steam outlet end of the measuring section are also respectively provided with a first manual stop valve.

3. The steam lossless metering device according to claim 1 is characterized in that: Second manual stop valves are respectively provided at both ends of the auxiliary pipeline.

4. The steam lossless metering device according to claim 1 is characterized in that: The main flow meter is set as a DN250 steam flow meter, and the auxiliary flow meter is set as a DN100 steam flow meter.

5. The steam lossless metering device according to claim 1 is characterized in that: The steam inlet end and the steam outlet end of the measuring section are respectively provided with three-way pipe fittings, and the auxiliary pipeline is connected with the steam inlet end and the steam outlet end of the measuring section through the three-way pipe fittings.

6. The steam lossless metering device according to claim 5 is characterized in that: The steam inlet and outlet ends of the measuring section and both ends of the auxiliary pipeline are respectively connected to the three-way pipe fitting through flange structures, and sealing gaskets are provided at the connection between the flange structure and the three-way pipe fitting.

7. The steam lossless metering device according to claim 1 is characterized in that: The PLC control structure is provided with a protection box and a control panel, and the control panel is installed in the protection box.

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