Purging system and coal mill wind speed measuring system

Abstract

The utility model relates to a purging system and a coal mill wind speed measuring system.The purging system is used for purging a coal mill wind speed measuring device, and the purging system comprises a gas conveying pipe which communicates with a gas source and is used for conveying gas; the connecting branch pipes are respectively communicated with the gas conveying pipe and sampling pipes of the coal mill wind speed measuring device, and the connecting branch pipes and the sampling pipes are arranged in a one-to-one correspondence manner; each connecting branch pipe is provided with the corresponding control valve, and the control valves are used for controlling connection and disconnection of the corresponding connecting branch pipes. The purging system is convenient to operate and high in efficiency.

Description

Technical Field

[0001] The present disclosure relates to the technical field of coal powder measurement auxiliary tools in thermal power plants, and in particular to a purge system and a coal mill wind speed measurement system. Background Art

[0002] The coal powder in the pulverizer will enter the boiler through the pipeline. In order to ensure the safe and stable operation of the boiler system, it is necessary to detect the wind speed in the pipeline through a wind speed detection device. Sometimes, fire extinguishing steam is introduced into the pulverizer, which causes the pipeline to be filled with a mixture of wind, powder and water. This mixture will enter the sampling tube through the sampling probe of the wind speed measuring device, causing the sampling probe and the sampling tube to be blocked, affecting the accuracy of the wind speed measurement results.

[0003] Therefore, the staff needs to regularly remove the sampling probe and clean the sampling probe and sampling tube. However, the installation position of the sampling probe is relatively biased, making it difficult to disassemble and assemble. In addition, at least two people are required to cooperate in each disassembly, purging, and reassembly, which seriously affects work efficiency. Utility Model Content

[0004] The object of the present disclosure is to provide a purge system and a coal mill wind speed measurement system, wherein the purge system is easy to operate and highly efficient.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present disclosure, there is provided a purging system, which is used for purging a coal mill wind speed measuring device, and the purging system comprises: a gas supply pipe, which is connected to a gas source for transmitting gas; a plurality of connecting branch pipes, which are respectively connected to the gas supply pipe and sampling tubes of the coal mill wind speed measuring device, and are arranged in a one-to-one correspondence with the sampling tubes; and a control valve, each of the connecting branch pipes is respectively provided with the control valve, and the control valve is used to control the opening and closing of the corresponding connecting branch pipe.

[0006] Optionally, the gas source is instrument gas, and a pressure reducing valve is provided on the gas pipeline, and the pressure reducing valve is used to adjust the pressure value of the instrument gas in the gas pipeline.

[0007] Optionally, a check valve is provided on the connecting branch pipe, and the check valve is arranged downstream of the control valve.

[0008] Optionally, the purge system further includes a first isolation valve and a second isolation valve, wherein the first isolation valve is arranged on the gas supply pipe and arranged upstream of the pressure reducing valve, and the second isolation valve is arranged on each of the connecting branch pipes, and the second isolation valve is arranged close to the sampling pipe.

[0009] Optionally, the gas delivery pipe is connected to the plurality of connecting branch pipes through a manifold.

[0010] Optionally, a sealing member is provided at the connection between the connecting branch pipe and the sampling tube, and the sealing member is constructed as a plastic cushion.

[0011] Optionally, the control valve is constructed as a solenoid valve and is electrically connected to a whole-plant control system, and the whole-plant control system is used to control the opening or closing of the solenoid valve.

[0012] Optionally, the purge system further comprises a manual switch, wherein the manual switch is electrically connected to the solenoid valve for controlling the opening or closing of the solenoid valve.

[0013] According to a second aspect of the present disclosure, a coal mill wind speed measurement system is provided, the coal mill wind speed measurement system comprising a coal mill wind speed measuring device and the above-mentioned purging system, the coal mill wind speed measuring device comprising a sampling tube and a measuring device, the sampling tube being connected to an outlet pipe of the coal mill and the measuring device, the purging system being connected to the sampling tube via the connecting branch pipe and being used for purging the sampling tube.

[0014] Optionally, the distance from the connection point between the connecting branch pipe and the sampling tube to the outlet pipe is 20 cm to 30 cm.

[0015] Through the above technical solution, in the purging system provided by the present disclosure, the gas supply pipe is connected to the gas source, and the connecting branch pipe is connected to the gas supply pipe and the sampling pipe, so that the gas can pass through the gas supply pipe and the connecting branch pipe in sequence and enter the sampling pipe to purge the sampling pipe. Among them, by setting a control valve to control the opening and closing of the corresponding connecting branch pipe, it is easy to open the corresponding connecting branch pipe to purge the sampling pipe and the sampling probe located at one end of the sampling pipe, which is convenient and efficient to operate; and when there is no need to purge the sampling pipe, the corresponding connecting branch pipe can be closed by the control valve, so that the purging effect of the purging system on the sampling pipe can be guaranteed, and the purging system can be prevented from affecting the measurement result of the wind speed measuring device.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of a coal mill wind speed measurement system provided in an embodiment of the present disclosure.

[0019] Description of Reference Numerals

[0020] 1. Gas pipeline; 2. Connecting branch pipe; 3. Sampling tube; 4. Control valve; 5. Pressure reducing valve; 6. Check valve; 7. First isolation valve; 8. Second isolation valve; 9. Manifold; 10. Seal; 11. Measuring device; 12. Outlet pipe; 13. Third isolation valve. DETAILED DESCRIPTION

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to "inside" and "outside" relative to the corresponding component's own outline. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.

[0023] According to a first aspect of the present disclosure, a purge system is provided, referring to Figure 1 As shown in the figure, the purging system is used to purge the coal mill wind speed measuring device, and the purging system includes: a gas pipeline 1, which is connected to a gas source for transmitting gas; a plurality of connecting branch pipes 2, which are respectively connected to the gas pipeline 1 and sampling pipes 3 of the coal mill wind speed measuring device, and are arranged one-to-one with the sampling pipes 3; and a control valve 4, each connecting branch pipe 2 is respectively provided with a control valve 4, and the control valve 4 is used to control the opening and closing of the corresponding connecting branch pipe 2.

[0024] Through the above technical solution, in the purging system provided by the present disclosure, the gas pipe 1 is connected to the gas source, and the connecting branch pipe 2 is connected to the gas pipe 1 and the sampling pipe 3, so that the gas can pass through the gas pipe 1 and the connecting branch pipe 2 in sequence and enter the sampling pipe 3 to purge the sampling pipe 3. Among them, by setting the control valve 4 to control the opening and closing of the corresponding connecting branch pipe 2, it is convenient to open the corresponding connecting branch pipe 2 to purge the sampling pipe 3 and the sampling probe located at one end of the sampling pipe 3, which is convenient and efficient to operate; and when there is no need to purge the sampling pipe 3, the corresponding connecting branch pipe 2 can be closed by the control valve, so that the purging effect of the purging system on the sampling pipe 3 can be guaranteed, and the purging system can be prevented from affecting the measurement result of the wind speed measuring device.

[0025] In the purge system provided in the present disclosure, the gas source can be constructed in any suitable manner. As an exemplary embodiment, refer to Figure 1As shown in , the gas source can be instrument gas, and a pressure reducing valve 5 can be provided on the gas pipeline 1, and the pressure reducing valve 5 is used to adjust the pressure value of the instrument gas in the gas pipeline 1. Among them, the instrument gas adopts the existing instrument gas in the power plant, so that there is no need to arrange the gas source externally, and the economic performance is excellent. In addition, the existing instrument gas has a stable air pressure, and after being filtered by an air drying device, the stability of the air source of the purge system can be ensured. In addition, by providing the pressure reducing valve 5, the pressure value of the instrument gas in the gas pipeline 1 can be adjusted to 0.3MPa-0.4MPa. In this way, under the premise of ensuring the purging effect of the purge system on the sampling tube 3, it is possible to avoid the situation where the pipeline is worn due to excessive air pressure of the instrument gas. Among them, the pressure reducing valve 5 can use a 420X adjustable pressure reducing valve, or any other suitable pressure reducing valve, and the present disclosure does not make specific restrictions on this.

[0026] In the purge system provided in the present disclosure, in order to ensure the stability of the purge system, as an exemplary embodiment, reference is made to Figure 1 As shown in , a check valve 6 may be provided on the connecting branch pipe 2, and the check valve 6 may be arranged downstream of the control valve 4. In this way, the check valve 6 can prevent the air-powder-water mixture in the sampling tube 3 from entering the control valve 4 to avoid damaging the control valve 4.

[0027] In the purge system provided in the present disclosure, in order to facilitate the maintenance of the purge system, as an exemplary embodiment, reference is made to Figure 1 As shown in , the purge system may further include a first isolation valve 7 and a second isolation valve 8. The first isolation valve 7 may be provided on the gas transmission pipe 1 and arranged upstream of the pressure reducing valve 5. Each connecting branch pipe 2 may be provided with a second isolation valve 8, and the second isolation valve 8 may be arranged close to the sampling pipe 3. In this way, when the purge system fails and needs to be repaired, the first isolation valve 7 and the second isolation valve 8 may be used to isolate the purge system from other external devices to facilitate the repair of the purge system.

[0028] In the purge system provided in the present disclosure, the gas delivery pipe 1 can be connected to the connecting branch pipe 2 in any suitable manner. As an exemplary embodiment, refer to Figure 1 As shown in the figure, the gas pipeline 1 can be connected to multiple connecting branches 2 through a manifold 9. In this way, it is convenient to distribute the instrument gas in the gas pipeline 1 to multiple connecting branches 2, and the layout is simple. In other embodiments, the gas pipeline 1 can be connected to the connecting branch 2 in other suitable ways, such as through a tee connection, etc., and the present disclosure does not make specific restrictions on this.

[0029] In the purge system provided in the present disclosure, in order to ensure the connection reliability between the connecting branch pipe 2 and the sampling pipe 3, as an exemplary embodiment, reference is made to Figure 1As shown in , a seal 10 may be provided at the connection between the connecting branch pipe 2 and the sampling tube 3, and the seal 10 may be constructed as a plastic cushion. In this way, the sealing effect between the connecting branch pipe 2 and the sampling tube 3 can be ensured, and the instrument gas is prevented from escaping from the connection between the connecting branch pipe 2 and the sampling tube 3, thereby ensuring the purging effect of the purging system on the sampling tube 3 and the sampling probe. Among them, the seal 10 is constructed as a plastic cushion, which can also avoid pipeline wear caused by vibration and purging.

[0030] In the present disclosure, a heat preservation device may be provided at the connection between the branch pipe 2 and the sampling pipe 3, so as to avoid blockage of the pipeline connection due to condensation in winter, wherein the heat preservation device may be constructed in any suitable manner, such as heat preservation cotton, etc., and the present disclosure does not impose any specific restrictions on this.

[0031] In the purge system provided in the present disclosure, the control valve 4 can be constructed in any suitable manner. As an exemplary embodiment, refer to Figure 1 As shown in , the control valve 4 is constructed as a solenoid valve and is electrically connected to the whole plant control system, which is used to control the opening or closing of the solenoid valve. In this way, it is convenient for the staff to remotely operate the purge system to improve efficiency and save manpower. Among them, the solenoid valve can be a three-position five-way valve, or other suitable solenoid valve, and the present disclosure does not make specific restrictions on this.

[0032] In the present disclosure, the whole plant control system can also be electrically connected to the steam solenoid valve, which is used to control whether to pass fire extinguishing steam into the outlet pipe 12 of the coal mill, and the whole plant control system is configured to: open the steam solenoid valve and the control valve 4 in turn, and close the steam solenoid valve and the control valve 4 in turn. In this way, when the fire extinguishing steam is passed into the outlet pipe 12, the control valve 4 can control the purge system to purge the sampling tube 3 in time to prevent the mixture of wind, powder and water from entering the sampling tube 3, and ensure the cleaning effect of the purge system on the sampling tube 3. Among them, the opening (or closing) time interval between the steam solenoid valve and the control valve 4 can be set to 3-5 seconds. This is because the fire extinguishing steam needs to pass a certain time before it can reach the connection between the sampling tube 3 and the outlet pipe 12. Therefore, the setting of the above-mentioned opening (or closing) time interval can ensure the purge effect, and at the same time, it can also avoid the energy waste caused by opening the control valve 4 too early. In other embodiments, the opening (or closing) time interval can also be appropriately selected according to actual needs, and the present disclosure does not make specific restrictions on this.

[0033] In the purge system provided by the present disclosure, in order to further improve the reliability of the purge system, as an exemplary embodiment, the purge system may also include a manual switch, which may be electrically connected to the solenoid valve to control the opening or closing of the solenoid valve. In this way, when the plant-wide control system fails and cannot control the solenoid valve, the solenoid valve can be opened and closed by the manual switch to ensure that the purge system can operate stably. The manual switch may be set in any suitable manner, such as the manual switch may be set to: press once to control the opening of the solenoid valve, and press again to control the closing of the solenoid valve; or it may be set to: press to control the opening of the solenoid valve, and release to control the closing of the solenoid valve, or it may be arranged in other suitable manners, and the present disclosure does not impose specific restrictions on this.

[0034] According to a second aspect of the present disclosure, a coal mill wind speed measurement system is provided, referring to Figure 1 As shown in , the coal mill wind speed measurement system includes a coal mill wind speed measurement device and the above-mentioned purge system, the coal mill wind speed measurement device includes a sampling tube 3 and a measuring device 11, the sampling tube 3 is connected to the outlet pipe 12 of the coal mill and the measuring device 11, and the purge system is connected to the sampling tube 3 through the connecting branch pipe 2 and is used to purge the sampling tube 3. In this way, the instrument gas in the connecting branch pipe 2 can enter the sampling tube 3 and purge the inner wall of the sampling tube 3.

[0035] In the present disclosure, the diameter of the sampling tube 3 is 18 mm, which can provide a wider flow cross section for the mixture of wind, powder and water, so as to reduce the risk of blockage of the sampling tube 3. In addition, the sampling tube 3 is arranged as a straight pipe, which can avoid the accumulation of the mixture of wind, powder and water on the inner wall of the sampling tube 3 due to the curved pipe section.

[0036] In the coal mill wind speed measurement system provided in the present disclosure, the connecting branch pipe 2 can be arranged at any position of the sampling pipe 3. As an exemplary embodiment, refer to Figure 1 As shown in , the distance from the connection point between the connecting branch pipe 2 and the sampling tube 3 to the outlet pipe 12 can be 20 cm to 30 cm. Among them, since a sampling probe is provided at one end of the connecting branch pipe 2 connected to the outlet pipe 12, and the sampling probe is arranged in the outlet pipe 12, it is more prone to blockage. Therefore, the connection point between the connecting branch pipe 2 and the sampling tube 3 is arranged close to the outlet pipe 12, which can ensure the purging effect of the instrument gas on the sampling probe and avoid clogging of the sampling probe. In this embodiment, the distance from the connection point between the connecting branch pipe 2 and the sampling tube 3 to the outlet pipe 12 is preferably 25 cm.

[0037] In the present disclosure, a heat preservation device may be provided at the connection between the sampling tube 3 and the outlet pipe 12, so as to avoid blockage of the pipe connection due to condensation in winter, wherein the heat preservation device may be constructed in any suitable manner, such as heat preservation cotton, etc., and the present disclosure does not impose any specific restrictions on this.

[0038] In the present disclosure, a seal may be provided at the connection between the sampling tube 3 and the outlet pipe 12, and the seal 10 may be constructed as a plastic cushion. In this way, the sealing effect between the sampling tube 3 and the outlet pipe 12 can be ensured, thereby ensuring the accuracy of the measurement result of the coal mill wind speed measuring device. Among them, the seal 10 is constructed as a plastic cushion, which can also avoid pipeline wear caused by vibration and purging.

[0039] In the present disclosure, a third isolation valve 13 may be correspondingly provided on each sampling tube 3, and the third isolation valve 13 may be arranged close to the outlet pipe 12. In this way, when the coal mill wind speed measuring device fails and needs to be repaired, the coal mill wind speed measuring device can be isolated from the outlet pipe 12 through the third isolation valve 13, so as to facilitate the repair of the coal mill wind speed measuring device.

[0040] During use of the purging system provided by the present invention, the control valve 4 is used to control the connecting branch pipe 2 to open, so that the instrument gas enters the sampling tube 3 through the connecting branch pipe 2 to purge the sampling tube 3, wherein the process of purging the sampling tube 3 with the instrument gas can be pulsed, or can be continuous purging for a period of time, or other suitable purging methods can be used. After the purging is completed, the control valve 4 controls the connecting branch pipe 2 to close.

[0041] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0043] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A purge system, which is used to purge a coal mill wind speed measuring device, characterized in that: The purge system comprises: A gas delivery pipe, the gas delivery pipe is connected to a gas source for transmitting gas; a plurality of connecting branch pipes, the connecting branch pipes are respectively connected to the gas transmission pipe and the sampling pipes of the coal mill wind speed measuring device, and are arranged one-to-one with the sampling pipes; and, A control valve is provided on each of the connecting branches, and the control valve is used to control the on-off of the corresponding connecting branch.

2. The purge system according to claim 1, characterized in that: The gas source is instrument gas, and a pressure reducing valve is provided on the gas pipeline, and the pressure reducing valve is used to adjust the pressure value of the instrument gas in the gas pipeline.

3. The purge system according to claim 2, characterized in that: The connecting branch pipe is provided with a check valve, and the check valve is arranged downstream of the control valve.

4. The purge system according to claim 3, characterized in that: The purge system also includes a first isolation valve and a second isolation valve. The first isolation valve is arranged on the gas pipeline and arranged upstream of the pressure reducing valve. The second isolation valve is arranged on each of the connecting branches. The second isolation valve is arranged close to the sampling pipe.

5. The purge system according to any one of claims 1 to 4, characterized in that: The gas delivery pipe is connected to the plurality of connecting branch pipes through a manifold.

6. The purge system according to claim 5, characterized in that: A sealing member is provided at the connection between the connecting branch pipe and the sampling tube, and the sealing member is constructed as a plastic cushion.

7. The purge system according to claim 5, characterized in that: The control valve is constructed as a solenoid valve and is electrically connected to a whole-plant control system, and the whole-plant control system is used to control the opening or closing of the solenoid valve.

8. The purge system according to claim 7, characterized in that: The purge system further includes a manual switch, which is electrically connected to the solenoid valve to control the opening or closing of the solenoid valve.

9. A coal mill wind speed measurement system, characterized in that: The coal mill wind speed measurement system includes a coal mill wind speed measuring device and a purging system according to any one of claims 1 to 8, wherein the coal mill wind speed measuring device includes a sampling tube and a measuring device, wherein the sampling tube is connected to the outlet pipe of the coal mill and the measuring device, and the purging system is connected to the sampling tube through the connecting branch pipe and is used to purge the sampling tube.

10. The coal mill wind speed measurement system according to claim 9, characterized in that: The distance from the connection point between the connecting branch pipe and the sampling pipe to the outlet pipe is 20 cm to 30 cm.

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