Star-shaped wheel disc flue gas sampling valve and use method thereof

Abstract

The invention relates to the technical field of flue gas sampling and monitoring, in particular to a star-shaped wheel disc flue gas sampling valve and a using method thereof. The star-shaped wheel disc flue gas sampling valve comprises: at least two flue gas sampling interfaces, which are arranged on the same circumferential surface along the circumferential direction and are used for sampling flue gas in flue gas circulation equipment; one end of the flue gas sampling component is connected with a flue gas analyzer, the other end of the flue gas sampling component is used for being communicated with a flue gas sampling connector, and the flue gas sampling component is used for conveying sampled flue gas in the flue gas circulation equipment to the flue gas analyzer; the electric control device is connected with the flue gas sampling component and is used for controlling the flue gas sampling component to be connected to a flue gas sampling interface needing sampling, so that the flue gas sampling component is communicated with the flue gas sampling interface. According to the star-shaped wheel disc flue gas sampling valve, remote automatic sampling analysis of at least two sampling points can be achieved, the workload of experimenters is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of smoke sampling and monitoring, and in particular to a star-shaped disc smoke sampling valve and a use method thereof. Background Art

[0002] In the various tests of power plant boilers, flue gas sampling and analysis is an indispensable link. In the existing test process, test personnel are required to travel between different sampling points on site for sampling and analysis, which consumes a lot of time and energy and has low test efficiency. Summary of the invention

[0003] The object of the present invention is to provide a star-shaped disc smoke sampling valve to solve the problem of low test efficiency caused by inconvenient smoke sampling in the prior art.

[0004] In order to solve the above problems, the present invention proposes a star-shaped disc flue gas sampling valve, and the technical solution adopted is: A star-shaped disc flue gas sampling valve, comprising: A smoke sampling interface, wherein the smoke sampling interface comprises at least two smoke sampling interfaces, and the smoke sampling interfaces are arranged in a circumferential direction on the same circumferential surface, and are used to sample smoke in the smoke circulation device; A smoke sampling component, one end of which is connected to a smoke analyzer, and the other end of which is connected to a smoke sampling interface, and the smoke sampling component is used to transport the sampled smoke in the smoke circulation device to the smoke analyzer; The electric control device is connected to the smoke sampling component and is used to control the smoke sampling component to be connected to the smoke sampling interface that needs to be sampled so that the smoke sampling component is communicated with the smoke sampling interface.

[0005] Furthermore, the number of the smoke sampling interfaces is 4-6, and the smoke sampling interfaces are arranged at equal angles along the circumferential direction on the same circumferential surface.

[0006] Furthermore, the smoke sampling component includes a smoke sampling outlet and a smoke sampling elbow rotatably connected to the smoke sampling outlet, the smoke sampling outlet is coaxially arranged with the same circumferential surface and is connected to the smoke gas analyzer, the electronic control device is connected to the smoke sampling elbow, and controls the smoke sampling elbow to rotate to the smoke sampling interface where sampling is required so that the smoke sampling elbow is connected to the smoke sampling interface.

[0007] Furthermore, the electric control device includes a valve mechanism and a motor connected thereto, the valve mechanism is connected to the smoke sampling elbow, and the motor controls the rotation of the smoke sampling elbow through the valve mechanism.

[0008] Furthermore, the valve mechanism includes a valve knob and a connecting shaft, the connecting shaft is fixedly connected to the smoke sampling bend, the valve knob is installed on the end of the connecting shaft away from the smoke sampling bend, and is connected to a motor, and the motor controls the rotation of the connecting shaft through the valve knob to drive the smoke sampling bend to rotate.

[0009] Furthermore, the star-shaped disc smoke sampling valve also includes an upper end cover and a lower end cover, a cylindrical accommodating cavity is formed between the upper end cover and the lower end cover, the smoke sampling interface radially extends out of the cylindrical accommodating cavity along the cylindrical accommodating cavity, the smoke sampling elbow is located in the cylindrical accommodating cavity, the smoke sampling outlet extends axially from the lower end cover along the cylindrical accommodating cavity, and the electronic control device passes through the upper end cover and is connected to the smoke sampling component.

[0010] Furthermore, the smoke sampling interface is connected to a smoke sampling inlet pipe radially arranged along the cylindrical accommodating cavity, the smoke sampling outlet is connected to a smoke sampling outlet pipe axially arranged along the cylindrical accommodating cavity, the smoke sampling elbow is rotatably connected to an end of the smoke sampling outlet pipe away from the smoke sampling outlet, a circular hole is opened at the center position of the lower end cover, the smoke sampling outlet pipe passes through the circular hole so that the smoke sampling outlet extends out of the lower end cover, and the smoke sampling outlet pipe is fixedly connected to the lower end cover.

[0011] Furthermore, in the cylindrical accommodating cavity, support columns corresponding one to one with the smoke sampling inlet pipes are arranged on the lower end cover, and the support columns are fixedly connected to the smoke sampling inlet pipes for supporting the smoke sampling inlet pipes. Beneficial effect: The present invention is an improved invention. At least two flue gas sampling interfaces are set up, one end of the flue gas sampling component is connected to a flue gas analyzer, and the flue gas sampling component is controlled by an electronic control device to be connected to the flue gas sampling interface to be sampled so that the flue gas sampling component is connected to the flue gas sampling interface, so that in the flue gas sampling process, remote automatic sampling and analysis from at least two sampling points can be realized, and the flue gas sampling interface to be sampled can be automatically selected as needed, thereby increasing the sampling flexibility, so that a single tester can complete the work of sampling and analysis of power plant boiler flue gas, which greatly simplifies the test process, reduces the workload of the experimenters, and improves work efficiency.

[0012] The present invention also provides a method for using the star-shaped disc smoke sampling valve, which is used for using the star-shaped disc smoke sampling valve, and comprises the following steps: S1, arranging at least two smoke sampling interfaces on the same circumferential surface along the circumferential direction and connecting them to the smoke circulation equipment to sample the smoke in the smoke circulation equipment; S2, connect the electronic control device to the flue gas sampling component, one end of the flue gas sampling component is connected to the flue gas analyzer. When sampling, the electronic control device controls the other end of the flue gas sampling component to be connected to the flue gas sampling interface that needs to be sampled so that the flue gas sampling component is connected to the flue gas sampling interface, and the sampled flue gas in the flue gas circulation device is transported to the flue gas analyzer.

[0013] Further, the oxygen concentration in the flue gas is monitored and analyzed by a flue gas analyzer; When the oxygen concentration is less than or equal to 10%, continue to use the star-shaped disc flue gas sampling valve for flue gas sampling and analysis; When the oxygen concentration is greater than 10%, stop using the star-shaped disc flue gas sampling valve and check for leaks in the corresponding pipeline in the star-shaped disc flue gas sampling valve.

[0014] The number of the smoke sampling interfaces is 4-6, and the smoke sampling interfaces are arranged at equal angles on the same circumferential surface along the circumferential direction. This structure is simple and can improve the convenience and accuracy of smoke sampling.

[0015] The smoke sampling component includes a smoke sampling outlet and a smoke sampling elbow rotatably connected to the smoke sampling outlet. The smoke sampling outlet is coaxially arranged with the same circumferential surface and is connected to the smoke analyzer. The electronic control device is connected to the smoke sampling elbow and controls the smoke sampling elbow to rotate to the smoke sampling interface where sampling is required so that the smoke sampling elbow is connected to the smoke sampling interface. The structure is simple, that is, only one smoke sampling component is used to achieve sampling and analysis of multiple sampling points as needed, and the operation is convenient.

[0016] The electric control device comprises a valve mechanism and a motor connected thereto, wherein the valve mechanism is connected to the flue gas sampling elbow, and the motor controls the rotation of the flue gas sampling elbow through the valve mechanism, and has a simple structure and is easy to operate.

[0017] The star-shaped disc smoke sampling valve also includes an upper end cover and a lower end cover, a cylindrical accommodating cavity is formed between the upper end cover and the lower end cover, the smoke sampling interface radially extends out of the cylindrical accommodating cavity along the cylindrical accommodating cavity, the smoke sampling elbow is located in the cylindrical accommodating cavity, the smoke sampling outlet axially extends out of the lower end cover along the cylindrical accommodating cavity, the electric control device passes through the upper end cover and is connected to the smoke sampling component, so as to facilitate the stability of the structure of the star-shaped disc smoke sampling valve.

[0018] In the cylindrical accommodating cavity, a support column corresponding to the smoke sampling inlet pipe is arranged on the lower end cover, and the support column is fixedly connected to the smoke sampling inlet pipe to support the smoke sampling inlet pipe, so that the structure of the smoke sampling inlet pipe is stable and sampling failure is prevented.

[0019] After S2, the method for using the star-shaped disc flue gas sampling valve further includes: Monitor and analyze the oxygen concentration in the flue gas through a flue gas analyzer; When the oxygen concentration is less than or equal to 10%, continue to use the star-shaped disc flue gas sampling valve for flue gas sampling and analysis; When the oxygen concentration is greater than 10%, stop using the star-shaped disc flue gas sampling valve, and check for leaks in the corresponding pipelines in the star-shaped disc flue gas sampling valve to improve the accuracy and effectiveness of sampling analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic structural diagram of the star-shaped disc smoke sampling valve in Embodiment 1 of the star-shaped disc smoke sampling valve of the present invention; Figure 2 is a schematic diagram of smoke sampling and analysis in Example 1 of the method for using the star-shaped disc smoke sampling valve of the present invention; In the figure, 1. flue gas sampling elbow, 2. valve knob, 3. upper end cover, 4. lower end cover, 5. flue gas sampling inlet pipe, 6. flue gas sampling outlet pipe, 7. support column. DETAILED DESCRIPTION

[0021] As cited in the background technology, the inconvenience of smoke sampling in the prior art leads to low test efficiency. Therefore, the present invention provides a star-shaped disc smoke sampling valve, including a smoke sampling interface for sampling smoke in a smoke circulation device; the smoke sampling interface includes at least two, and the smoke sampling interfaces are arranged along the circumferential direction on the same circumferential surface, for realizing smoke sampling at multiple sampling points; a smoke sampling component, one end of the smoke sampling component is connected to a smoke analyzer, and the other end is used to connect the smoke sampling interface, for conveying the sampled smoke in the smoke circulation device to the smoke analyzer, and the smoke analyzer automatically monitors and analyzes the smoke; an electric control device, the electric control device is connected to the smoke sampling component, for controlling the smoke sampling component to be connected to the smoke sampling interface to be sampled so that the smoke sampling component is connected to the smoke sampling interface. The star-shaped disc flue gas sampling valve provided by the present invention can realize remote automatic sampling and analysis from at least two sampling points during the flue gas sampling process, and can also automatically select the flue gas sampling interface that needs to be sampled as needed, thereby increasing the sampling flexibility, so that a single tester can complete the work of sampling and analyzing the flue gas of power station boilers, greatly simplifying the test process, reducing the workload of the testers, and improving work efficiency.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Specific embodiment 1 of the star-shaped disc flue gas sampling valve of the present invention: In this embodiment, Figure 1 As shown, the star-shaped disc smoke sampling valve includes four smoke sampling interfaces, a smoke sampling component and an electronic control device. The four smoke sampling interfaces are arranged at equal angles in the circumferential direction on the same circumferential surface and are used to sample the smoke in the smoke circulation equipment; one end of the smoke sampling component is connected to the smoke analyzer, and the other end is used to connect to the smoke sampling interface. The smoke sampling component is used to transport the sampled smoke in the smoke circulation equipment to the smoke analyzer; the electronic control device is connected to the smoke sampling component, and is used to control the smoke sampling component to be connected to the smoke sampling interface to be sampled in turn so that the smoke sampling component is connected to the smoke sampling interface. The star-shaped disc smoke sampling valve is also connected to a vacuum pump. When it is necessary to sample one of the four smoke sampling outlets, the electronic control device controls the smoke sampling component to be connected to the smoke sampling interface that needs to be sampled so that the smoke sampling component is connected to the smoke sampling interface. The vacuum pump provides negative pressure to draw the smoke in the smoke circulation equipment to the smoke sampling interface, and the sampled smoke in the smoke circulation equipment is transported to the smoke analyzer through the smoke sampling component. The smoke analyzer collects the smoke for automatic analysis. By connecting the four smoke sampling interfaces in sequence and sampling the corresponding smoke, smoke analysis at multiple sampling points is achieved.

[0024] The smoke sampling component may include four smoke sampling outlets and four smoke sampling elbows 1 rotatably connected to the smoke sampling outlets. At this time, the electric control device is connected to the four smoke sampling elbows 1 at the same time. When it is necessary to sample one of the four smoke sampling outlets, the electric control device controls the smoke sampling elbow 1 corresponding to the smoke sampling outlet to be connected to the smoke sampling interface so that the smoke sampling elbow 1 is connected to the smoke sampling interface, and the sampling of all the smoke sampling interfaces is completed in sequence. However, the structure is complicated and difficult to operate, so In this embodiment, preferably, the smoke sampling component includes a smoke sampling outlet and a smoke sampling elbow 1 rotatably connected to the smoke sampling outlet, the smoke sampling outlet is coaxially arranged with the same circumferential surface and is connected to the smoke analyzer, and the electric control device is connected to the smoke sampling elbow 1. When it is necessary to sample one of the four smoke sampling outlets, the electric control device controls the smoke sampling elbow 1 to rotate to the smoke sampling interface that needs to be sampled so that the smoke sampling elbow 1 is connected to the smoke sampling interface. The structure is simple and easy to operate.

[0025] In other embodiments, the number of the smoke sampling interfaces is 2, and the smoke sampling interfaces are arranged at the same angle along the circumferential direction on the same circumferential surface.

[0026] In other embodiments, the number of the smoke sampling interfaces is 6, and the smoke sampling interfaces are arranged at the same angle along the circumferential direction on the same circumferential surface.

[0027] In other embodiments, the smoke sampling interfaces may be arranged at different angles along the circumferential direction on the same circumferential surface.

[0028] Specific embodiment 2 of the star-shaped disc flue gas sampling valve of the present invention: Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0029] In this embodiment, Figure 1 As shown, the electric control device includes a valve mechanism and a motor connected thereto, the valve mechanism is connected to the smoke sampling elbow 1, and the motor controls the rotation of the smoke sampling elbow 1 through the valve mechanism. Specifically, the valve mechanism includes a valve knob 2 and a connecting shaft, the connecting shaft is fixedly connected to the smoke sampling elbow 1, the valve knob 2 is installed on the end of the connecting shaft away from the smoke sampling elbow 1, and is connected to the motor, the motor controls the rotation of the connecting shaft through the valve knob 2 and then drives the smoke sampling elbow 1 to rotate. When in use, the motor starts, drives the valve knob 2 to rotate and controls the rotation of the connecting shaft to drive the smoke sampling elbow 1 to rotate, and rotates the smoke sampling elbow 1 to the smoke sampling interface where sampling is required so that the smoke sampling elbow 1 is connected to the smoke sampling interface.

[0030] Specific embodiment 3 of the star-shaped disc flue gas sampling valve of the present invention: Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0031] In this embodiment, Figure 1 As shown, the star-shaped disc smoke sampling valve also includes an upper end cover 3 and a lower end cover 4, a cylindrical accommodating cavity is formed between the upper end cover 3 and the lower end cover 4, a smoke sampling interface radially extends out of the cylindrical accommodating cavity along the cylindrical accommodating cavity, a smoke sampling elbow 1 is located in the cylindrical accommodating cavity, a smoke sampling outlet extends axially out of the lower end cover 4 along the cylindrical accommodating cavity, and an electric control device passes through the upper end cover 3 and is connected to the smoke sampling component.

[0032] Specifically, the flue gas sampling interface is connected with a flue gas sampling air inlet pipe 5 radially arranged along the cylindrical accommodating cavity. Four flue gas sampling air inlet pipes 5 are evenly distributed at intervals of 90° below the upper end cover 3 and are fixedly connected. The outer diameter of the air inlet is 12 mm, which is adapted to the diameter of the leather tube commonly used in power plant experiments. The flue gas sampling outlet is connected with a flue gas sampling air outlet pipe 6 axially arranged along the cylindrical accommodating cavity. The flue gas sampling elbow 1 is rotatably connected to the end of the flue gas sampling air outlet pipe 6 away from the flue gas sampling outlet to form a sealed connection. A circular hole is provided at the center of the lower end cover 4. The flue gas sampling air outlet pipe 6 passes through the circular hole so that the flue gas sampling outlet extends out of the lower end cover 4, and the flue gas sampling air outlet pipe 6 is fixedly connected to the lower end cover 4. At the same time, a connecting hole is provided at the center of the upper end cover 3. The connecting shaft passes through the connecting hole and is fixedly connected to the flue gas sampling elbow 1, and the connecting shaft can be rotatably arranged in the connecting hole. In the cylindrical accommodating cavity, support columns 7 corresponding one to one with the smoke sampling inlet pipe 5 are arranged on the lower end cover 4, each support column 7 is fixedly connected to the lower end cover 4, and the support column 7 is fixedly connected to the smoke sampling inlet pipe 5 for supporting the smoke sampling inlet pipe 5.

[0033] In other embodiments, a circular hole is opened at the center of the lower end cover 4, and the smoke sampling elbow 1 passes through the circular hole, so that the smoke sampling outlet pipe 6 extends out of the lower end cover 4 and the smoke sampling outlet extends out of the lower end cover 4. At this time, the smoke sampling outlet pipe 6 is fixedly connected to the lower end cover 4 by a connecting rod, and the smoke sampling elbow 1 is rotatably installed in the circular hole.

[0034] Specific embodiment 1 of the method for using the star-shaped disc flue gas sampling valve of the present invention: In this embodiment, Figure 1 and Figure 2 As shown, the star-shaped disc smoke sampling valve is used for the above-mentioned use, and the method for using the star-shaped disc smoke sampling valve includes the following steps: First, at least two smoke sampling interfaces are arranged along the circumferential direction on the same circumferential surface and connected to the smoke circulation device to sample the smoke in the smoke circulation device; Secondly, the electronic control device is connected to the smoke sampling component, and one end of the smoke sampling component is connected to the smoke analyzer. When sampling, the electronic control device controls the other end of the smoke sampling component to be connected to the smoke sampling interface to be sampled so that the smoke sampling component is connected to the smoke sampling interface, and the smoke in the sampled smoke circulation device is transported to the smoke analyzer; Finally, the oxygen concentration in the flue gas is monitored and analyzed by a flue gas analyzer; When the oxygen concentration is less than or equal to 10%, continue to use the star-shaped disc flue gas sampling valve for flue gas sampling and analysis; When the oxygen concentration is greater than 10%, stop using the star-shaped disc flue gas sampling valve and check for leaks in the corresponding pipeline in the star-shaped disc flue gas sampling valve.

[0035] Specifically, taking the power plant boiler efficiency test as an example, the method of using the star disc flue gas sampling valve includes the following steps: First, during the flue gas sampling process, four flue gas sampling inlet pipes 5 and their corresponding flue gas sampling interfaces are arranged on the same circumferential surface along the circumferential direction, and are connected to the A / B side of the air preheater inlet and the A / B side of the air preheater outlet respectively; Secondly, the flue gas sampling outlet pipe 6 and its corresponding flue gas sampling outlet are connected to the inlet of the flue gas pretreatment device through a rubber hose, the outlet of the flue gas pretreatment device is connected to the inlet of the vacuum pump through a rubber hose, and the outlet of the vacuum pump is connected to the flue gas analyzer through a rubber hose; wherein, the function of the flue gas pretreatment device is to remove moisture and large particles of dust in the flue gas that is to enter the flue gas analyzer in advance to avoid damage to the flue gas analyzer.

[0036] After starting work, start the motor, and according to the experimental requirements, the motor controls the valve knob 2 to rotate 90° every 60 seconds (or other time intervals), and connects to the flue gas sampling interfaces that need to be sampled in turn so that the flue gas sampling components are connected to the flue gas sampling interfaces, and the vacuum pump provides negative pressure to draw the flue gas at the inlet and outlet of the air preheater to the corresponding flue gas sampling interfaces, and enters the subsequent processing device and flue gas analyzer through the flue gas sampling elbow 1 and the flue gas sampling outlet.

[0037] Finally, the flue gas is sampled and analyzed by the flue gas analyzer. When the oxygen concentration is less than or equal to 10%, the data is considered reasonable, the data is recorded and the star-shaped disc flue gas sampling valve is used to continue to perform flue gas sampling and analysis; When the oxygen concentration is greater than 10%, the motor-controlled valve knob 2 is closed to suspend operation, the star-shaped disc flue gas sampling valve is stopped, and the remote experimenter is notified to check for leaks in the corresponding pipeline in the star-shaped disc flue gas sampling valve until the leak is dealt with and the oxygen concentration returns to normal.

[0038] Through the above description of the specific embodiments of the star-shaped disc smoke sampling valve of the present invention, it can be seen that the star-shaped disc smoke sampling valve of the present invention includes a smoke sampling interface for sampling the smoke in the smoke circulation equipment; the smoke sampling interface includes at least two, and the smoke sampling interfaces are arranged along the circumferential direction on the same circumferential surface, so as to realize smoke sampling at multiple sampling points; a smoke sampling component, one end of the smoke sampling component is connected to the smoke analyzer, and the other end is used to connect to the smoke sampling interface, so as to transport the sampled smoke in the smoke circulation equipment to the smoke analyzer, and the smoke analyzer automatically monitors and analyzes the smoke; an electronic control device, the electronic control device is connected to the smoke sampling component, and is used to control the smoke sampling component to be connected to the smoke sampling interface to be sampled so that the smoke sampling component is connected to the smoke sampling interface. The star-shaped disc flue gas sampling valve provided by the present invention can realize remote automatic sampling and analysis from at least two sampling points during the flue gas sampling process, and can also automatically select the flue gas sampling interface that needs to be sampled as needed, thereby increasing the sampling flexibility, so that a single tester can complete the work of sampling and analyzing the flue gas of power station boilers, greatly simplifying the test process, reducing the workload of the testers, and improving work efficiency.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A star-shaped disc flue gas sampling valve, characterized in that: include: A smoke sampling interface, wherein the smoke sampling interface comprises at least two smoke sampling interfaces, and the smoke sampling interfaces are arranged in a circumferential direction on the same circumferential surface, and are used to sample smoke in the smoke circulation device; A smoke sampling component, one end of which is connected to a smoke analyzer, and the other end of which is connected to a smoke sampling interface, and the smoke sampling component is used to transport the sampled smoke in the smoke circulation device to the smoke analyzer; The electric control device is connected to the smoke sampling component and is used to control the smoke sampling component to be connected to the smoke sampling interface that needs to be sampled so that the smoke sampling component is communicated with the smoke sampling interface.

2. The star-shaped disc flue gas sampling valve according to claim 1, characterized in that: The number of the smoke sampling interfaces is 4-6, and the smoke sampling interfaces are arranged at the same angle along the circumferential direction on the same circumferential surface.

3. The star-shaped disc flue gas sampling valve according to claim 2, characterized in that: The smoke sampling component comprises a smoke sampling outlet and a smoke sampling elbow (1) rotatably connected to the smoke sampling outlet, the smoke sampling outlet being coaxially arranged with the same circumferential surface and connected to a smoke analyzer, the electric control device being connected to the smoke sampling elbow (1) and controlling the smoke sampling elbow (1) to rotate to a smoke sampling interface where sampling is required so that the smoke sampling elbow (1) is connected to the smoke sampling interface.

4. The star-shaped disc flue gas sampling valve according to claim 3, characterized in that: The electric control device comprises a valve mechanism and a motor connected thereto, the valve mechanism being connected to a smoke sampling curved pipe (1), and the motor controlling the rotation of the smoke sampling curved pipe (1) via the valve mechanism.

5. The star-shaped disc flue gas sampling valve according to claim 4, characterized in that: The valve mechanism comprises a valve knob (2) and a connecting shaft, wherein the connecting shaft is fixedly connected to the smoke sampling curved pipe (1), the valve knob (2) is mounted on an end of the connecting shaft away from the smoke sampling curved pipe (1), and is connected to a motor, wherein the motor controls the rotation of the connecting shaft through the valve knob (2) and thereby drives the smoke sampling curved pipe (1) to rotate.

6. The star-shaped disc flue gas sampling valve according to any one of claims 3 to 5, characterized in that: The star-shaped disc smoke sampling valve further comprises an upper end cover (3) and a lower end cover (4), wherein a cylindrical accommodating cavity is formed between the upper end cover (3) and the lower end cover (4), wherein the smoke sampling interface radially extends out of the cylindrical accommodating cavity, wherein the smoke sampling elbow (1) is located in the cylindrical accommodating cavity, wherein the smoke sampling outlet axially extends out of the lower end cover (4) along the cylindrical accommodating cavity, and wherein the electric control device passes through the upper end cover (3) and is connected to the smoke sampling component.

7. The star-shaped disc flue gas sampling valve according to claim 6, characterized in that: The smoke sampling interface is connected to a smoke sampling air inlet pipe (5) radially arranged along the cylindrical accommodating cavity, and the smoke sampling outlet is connected to a smoke sampling air outlet pipe (6) axially arranged along the cylindrical accommodating cavity. The smoke sampling elbow (1) is rotatably connected to an end of the smoke sampling air outlet pipe (6) away from the smoke sampling outlet. A circular hole is provided at the center of the lower end cover (4). The smoke sampling air outlet pipe (6) passes through the circular hole so that the smoke sampling outlet protrudes from the lower end cover (4), and the smoke sampling air outlet pipe (6) is fixedly connected to the lower end cover (4).

8. The star-shaped disc flue gas sampling valve according to claim 7, characterized in that: In the cylindrical accommodating cavity, a support column (7) corresponding one-to-one to the smoke sampling air inlet pipe (5) is provided on the lower end cover (4); the support column (7) is fixedly connected to the smoke sampling air inlet pipe (5) and is used to support the smoke sampling air inlet pipe (5).

9. A method for using the star-shaped disc flue gas sampling valve according to any one of claims 1 to 8, characterized in that: The steps include: S1, arranging at least two smoke sampling interfaces on the same circumferential surface along the circumferential direction and connecting them to the smoke circulation equipment to sample the smoke in the smoke circulation equipment; S2, connect the electronic control device to the flue gas sampling component, one end of the flue gas sampling component is connected to the flue gas analyzer. When sampling, the electronic control device controls the other end of the flue gas sampling component to be connected to the flue gas sampling interface that needs to be sampled so that the flue gas sampling component is connected to the flue gas sampling interface, and the sampled flue gas in the flue gas circulation device is transported to the flue gas analyzer.

10. The method for using the star-shaped disc flue gas sampling valve according to claim 9, characterized in that: After S2, the method for using the star-shaped disc flue gas sampling valve further includes: Monitor and analyze the oxygen concentration in the flue gas through a flue gas analyzer; When the oxygen concentration is less than or equal to 10%, continue to use the star-shaped disc flue gas sampling valve for flue gas sampling and analysis; When the oxygen concentration is greater than 10%, stop using the star-shaped disc flue gas sampling valve and check for leaks in the corresponding pipeline in the star-shaped disc flue gas sampling valve.

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