Primary air on-line measuring device

Abstract

The utility model relates to the technical field of power station boilers, and discloses a primary air on-line measuring device which comprises a backrest pipe and a pressure difference measuring mechanism connected to the upper end of the backrest pipe, and the lower end of the backrest pipe extends into a primary air pipeline in the radial direction of the primary air pipeline. The primary air pipeline is arranged on the backrest pipe and used for guiding primary air in the primary air pipeline into the pressure difference measuring mechanism, blowing assemblies are arranged on the two sides of the backrest pipe, one end of each blowing assembly is connected with the backrest pipe, the other end of each blowing assembly is connected with an air source, and the blowing assemblies are used for guiding air in the air source into the backrest pipe so as to clean dust in the backrest pipe. The primary air on-line measuring device provided by the utility model has the advantage of avoiding the situations that in a severe measuring environment, a measuring error is caused by manual visual inspection of a measured numerical value, and dust accumulated in each measuring process cannot be cleaned in time, so that the measuring accuracy is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of power station boilers, in particular to an on-line primary air measurement device. Background Technique

[0002] A reasonable distribution of the primary air velocity in a power station boiler is of great significance to the combustion operation of the unit. The operator conducts a primary air leveling experiment to ensure that the deviation between the air velocities in each primary air duct of the boiler is within a reasonable deviation range, so as to obtain a good aerodynamic condition and combustion efficiency.

[0003] At present, in the primary air leveling experiment, the air velocity in each primary air duct is usually measured repeatedly by manual measurement. However, the on-site conditions for primary air measurement are relatively harsh. By observing the measurement values with the naked eye, there is a high possibility of large deviation in the measurement results. Secondly, to meet the corresponding requirements for the primary air measurement points of large-capacity units, the measurement personnel need to climb to the high-altitude position of the straight pipe section and put the measurement tool into the pipe. There are corresponding safety hazards during the climbing process. At the same time, the measurement tools used manually do not have a cleaning function and cannot clean the dust accumulated during each measurement in time, which affects the measurement accuracy.

[0004] Therefore, it is necessary to manufacture a device that can solve at least one of the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide an on-line primary air measurement device based on the above problems.

[0006] To achieve the above purpose, the utility model provides an on-line primary air measurement device, which includes a backrest pipe and a differential pressure measurement mechanism connected to the upper end of the backrest pipe. The lower end of the backrest pipe extends radially into the primary air duct to introduce the primary air in the primary air duct into the differential pressure measurement mechanism. Both sides of the backrest pipe are provided with purging components. One end of the purging component is connected to the backrest pipe, and the other end is connected to a gas source for introducing the gas in the gas source into the backrest pipe to clean the dust in the backrest pipe.

[0007] Preferably, the purging component includes a purging pipe and a first gas delivery pipe connected to one end of the purging pipe. The other end of the purging pipe is connected to the backrest pipe, and a first control valve is arranged on the first gas delivery pipe to control the flow of the gas in the first gas delivery pipe.

[0008] Preferably, the differential pressure measurement mechanism includes a U-shaped differential pressure gauge, and both ends of the U-shaped differential pressure gauge are correspondingly connected to two air outlets of the backrest pipe.

[0009] Preferably, the differential pressure measuring mechanism further includes two connecting pipes. Both ends of the U-shaped differential pressure gauge are respectively connected to the two air outlets of the backrest pipe through the connecting pipes. A second control valve is provided on each connecting pipe to control the flow of gas in the connecting pipe.

[0010] Preferably, the primary air on-line measuring device includes a driving mechanism arranged on the primary air pipeline. The driving mechanism is used to drive the backrest pipe to move in the radial direction of the primary air pipeline.

[0011] Preferably, the driving mechanism includes a driver and a slide rail. The slide rail is arranged along the axial direction of the backrest pipe. A sliding member that can slide along the slide rail is provided on the slide rail. The sliding member is fixedly connected to the backrest pipe. The driver is set to be able to drive the sliding member to slide along the slide rail, thereby driving the backrest pipe to move along its axial direction.

[0012] Preferably, the driver is an electric cylinder. The driving mechanism further includes a push rod. One end of the push rod is connected to the electric cylinder, and the other end is fixedly connected to the sliding member. The electric cylinder drives the sliding member to slide along the slide rail by lifting or lowering the push rod.

[0013] Preferably, a sealing mechanism is provided between the backrest pipe and the primary air pipeline.

[0014] Preferably, the sealing mechanism includes a first sealing assembly and a second sealing assembly arranged on the first sealing assembly. The first sealing assembly is used to seal the connection between the backrest pipe and the primary air pipeline. The second sealing assembly is used to seal the connection between the first sealing assembly and the backrest pipe. The second sealing assembly fixes the first sealing assembly on the primary air pipeline.

[0015] Preferably, the first sealing assembly includes a sealing ring. The second sealing assembly includes a pneumatic seal. The primary air on-line measuring device further includes a fastener. The fastener fixes the pneumatic seal and the sealing ring on the primary air pipeline. A second gas delivery pipe is connected to the pneumatic seal. A third control valve is provided on the second gas delivery pipe to control the flow of gas in the second gas delivery pipe.

[0016] Through the above technical solutions, the backrest pipe in the primary air on-line measuring device provided by the present utility model passes through the primary air pipeline to introduce the primary air into the differential pressure measuring mechanism, so as to accurately obtain the wind speed value of the primary air. The purging assemblies arranged on both sides of the backrest pipe introduce the gas in the gas source into the backrest pipe to clean the dust accumulated in the backrest pipe during the measurement process. Therefore, it avoids the measurement errors caused by manual visual observation of the measurement values in a harsh measurement environment and the situation that the accuracy of the measurement is affected by the dust accumulated in each measurement process and cannot be cleaned in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic structural diagram of the primary air online measurement device of the present utility model.

[0018] Explanation of reference numerals

[0019] 1. Backrest pipe; 101. Air outlet; 201. Purge pipe; 202. First gas delivery pipe; 203. First control valve; 301. U-shaped differential pressure gauge; 302. Second control valve; 303. Connecting pipe; 401. Base; 402. Driver; 403. Slide rail; 404. Sliding member; 405. Push rod; 501. Sealing ring; 502. Pneumatic seal; 503. Second gas delivery pipe; 504. Third control valve; 6. Primary air pipeline. Specific embodiments

[0020] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present utility model, and are not intended to limit the present utility model.

[0021] The present utility model provides a primary air online measurement device, as Figure 1 shown, the primary air online measurement device includes a backrest pipe 1 and a differential pressure measurement mechanism connected to the upper end of the backrest pipe 1. The lower end of the backrest pipe 1 extends radially into the primary air pipeline 6 along the primary air pipeline 6 to introduce the primary air in the primary air pipeline 6 into the differential pressure measurement mechanism. Purge assemblies are provided on both sides of the backrest pipe 1. One end of the purge assembly is connected (including communicated) to the backrest pipe 1, and the other end is connected (including communicated) to a gas source, and is used to introduce the gas in the gas source into the backrest pipe 1 to clean the dust in the backrest pipe 1.

[0022] Through the above technical solution, the backrest pipe 1 in the primary air online measurement device provided by the present utility model passes through the primary air pipeline 6 to introduce the primary air into the differential pressure measurement mechanism, so as to accurately obtain the wind speed value of the primary air. The purge assemblies provided on both sides of the backrest pipe 1 introduce the gas in the gas source into the backrest pipe 1 to clean the dust accumulated in the backrest pipe 1 during the measurement process. Therefore, it avoids the measurement errors caused by manual visual observation of the measurement values in a harsh measurement environment and the situation that the accuracy of the measurement is affected by the dust accumulated in each measurement process and cannot be cleaned in time.

[0023] The purge assembly of the present utility model can have any suitable structure. For example Figure 1 in the shown embodiment, the purge assembly may include a purge pipe 201 and a first gas delivery pipe 202 connected to one end of the purge pipe 201. The other end of the purge pipe 201 is connected to the backrest pipe 1. The gas in the gas source flows into the backrest pipe 1 through the first gas delivery pipe 202 and the purge pipe 201 to backflush and clean the dust in the backrest pipe 1.

[0024] A first control valve 203 may be provided on the first gas delivery pipe 202 to control the gas flow in the first gas delivery pipe 202. Of course, in some other embodiments, the position of the first control valve 203 may be set on the purge pipe 201.

[0025] In the present utility model, the differential pressure measuring mechanism may include a U-shaped differential pressure gauge 301. The two ends of the U-shaped differential pressure gauge 301 are correspondingly connected to the two air outlets 101 of the backrest pipe 1 to measure the differential pressure in the two air ducts of the backrest pipe 1, and based on the relationship between the wind speed and the differential pressure, the wind speed value of the primary air can be obtained. Of course, in some other embodiments, the U-shaped differential pressure gauge 301 may be replaced with other measuring mechanisms for measuring differential pressure, and the present utility model will not elaborate on this too much here.

[0026] In some embodiments, the differential pressure measuring mechanism may further include two connecting pipes 303. The two ends of the U-shaped differential pressure gauge 301 are respectively connected to the two air outlets 101 of the backrest pipe 1 through the connecting pipes 303, and a second control valve 302 is provided on each connecting pipe 303 to control the gas flow in the connecting pipe 303.

[0027] In the present utility model, the first control valve 203 and the second control valve 302 are used in cooperation. When the first control valve 203 is closed and the second control valve 302 is opened, the backrest pipe 1 introduces the primary air from the primary air duct 6 into the U-shaped differential pressure gauge 301 to measure the wind speed of the primary air; when the first control valve 203 is opened and the second control valve 302 is closed, the gas in the first gas delivery pipe 202 enters the backrest pipe 1 to backflush and clean the dust accumulated in the backrest pipe 1 during the measurement process.

[0028] In some other embodiments, the position of the second control valve 302 may be set inside the backrest pipe 1 and between the lower end of the air outlet 101 of the backrest pipe 1 and the upper end of the connection between the purge pipe 201 and the backrest pipe 1.

[0029] In the present utility model, the on-line primary air measuring device may include a driving mechanism provided on the primary air duct 6. After receiving the signal instruction from the measuring personnel, the driving mechanism drives the backrest pipe 1 to move radially along the primary air duct 6 for measuring multiple points in the moving direction of the backrest pipe 1 in the primary air duct 6, thereby improving the measuring accuracy of the on-line primary air measuring device. Secondly, after the measurement is completed, the lower end of the backrest pipe 1 is docked at the opening of the primary air duct 6, and when the next measurement is carried out, the lower end of the backrest pipe 1 extends into the primary air duct 6.

[0030] The driving mechanism may have any suitable structure, such as Figure 1In the illustrated embodiment, the drive mechanism may include a driver 402 and a slide rail 403. The slide rail 403 is arranged to extend along the axial direction of the backrest tube 1, and a slider 404 that can slide along the slide rail 403 is further provided on the slide rail 403. The slider 404 is fixedly connected to the backrest tube 1, and the driver 402 is configured to be able to drive the slider 404 to slide along the slide rail 403, thereby driving the backrest tube 1 to move along its axial direction.

[0031] As Figure 1 shown, the drive mechanism may include a base 401 respectively arranged between the driver 402 and the slide rail 403 and the primary air duct 6, which is used to play a buffering role.

[0032] In some embodiments, as Figure 1 shown, the driver 402 may include an electric cylinder, and the drive mechanism further includes a push rod 405. One end of the push rod 405 is connected to the electric cylinder, and the other end is connected to the slider 404. By controlling the electric cylinder to lift or lower the push rod 405, the slider 404 is driven to slide along the slide rail 403.

[0033] In some other embodiments, a servo motor may be used as the driver 402. At the same time, the output end of the servo motor is connected to a lead screw. The lead screw extends along the axial direction of the backrest tube 1 through the slider 404 and is at the same height as the slide rail 403. It should be noted that at this time, the slide rail 403 needs to play a role in restricting the rotation of the slider 404.

[0034] In the present utility model, a sealing mechanism may be provided between the backrest tube 1 and the primary air duct 6, which is used to seal between the backrest tube 1 and the primary air duct 6, prevent the gas in the primary air duct 6 from leaking, and maintain the pressure stability in the primary air duct 6.

[0035] The sealing mechanism may have any suitable structure, such as Figure 1 shown in the embodiment, the sealing mechanism may include a first sealing assembly and a second sealing assembly provided on the first sealing assembly. The first sealing assembly is used to seal the connection between the backrest tube 1 and the primary air duct 6, and the second sealing assembly is used to seal the connection between the first sealing assembly and the backrest tube 1. And the second sealing assembly fixes the first sealing assembly on the primary air duct 6 to prevent the sealing ring 501 from being scraped off during the radial movement of the backrest tube 1 along the primary air duct 6.

[0036] In some embodiments, as Figure 1As shown, the first sealing assembly may include a sealing ring 501, and the second sealing assembly may include a pneumatic seal 502. Meanwhile, the primary air measuring device further includes a fastener for fixing the pneumatic seal 502 and the sealing ring 501 on the primary air duct 6. A second gas delivery pipe 503 is connected to the pneumatic seal 502 for introducing gas into the pneumatic seal 502 to perform backblowing seal on the connection between the sealing ring 501 and the backrest pipe 1. A third control valve 504 may be provided on the second gas delivery pipe 503 to control the gas flow in the second gas delivery pipe 503.

[0037] It should be noted that in the present utility model, the pneumatic seal 502 is arranged on the sealing ring 501. Compared with arranging the pneumatic seal 502 on the primary air duct 6, the sealing ring 501 also has the technical effect of sealing the connection between the pneumatic seal 502 and the primary air duct 6.

[0038] In some embodiments, the first control valve 203 and the third control valve 504 can change the gas flow area in the first gas delivery pipe 202 and the second gas delivery pipe 503 to change the gas flow rate in the first gas delivery pipe 202 and the second gas delivery pipe 503.

[0039] So far, the embodiments of the present utility model have been described in detail. To avoid obscuring the concept of the present utility model, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0040] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified or partial technical features can be equivalently replaced without departing from the scope and spirit of the present utility model. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A primary air online measurement device, characterized in that: The invention comprises a backrest tube (1) and a pressure difference measuring mechanism connected to the upper end of the backrest tube (1); the lower end of the backrest tube (1) extends into the primary air duct (6) along the radial direction of the primary air duct (6) so as to introduce the primary air in the primary air duct (6) into the pressure difference measuring mechanism; both sides of the backrest tube (1) are provided with a purge assembly; one end of the purge assembly is connected to the backrest tube (1) and the other end is connected to an air source so as to introduce the gas in the air source into the backrest tube (1) so as to clean the dust in the backrest tube (1).

2. The primary wind online measurement device according to claim 1, characterized in that: The purge assembly comprises a purge pipe (201) and a first gas delivery pipe (202) connected to one end of the purge pipe (201); the other end of the purge pipe (201) is connected to the backrest pipe (1); and the first gas delivery pipe (202) is provided with a first control valve (203) for controlling the flow of gas in the first gas delivery pipe (202).

3. The primary wind online measurement device according to claim 1, characterized in that: The differential pressure measuring mechanism comprises a U-shaped differential pressure gauge (301), and two ends of the U-shaped differential pressure gauge (301) are correspondingly connected to two air outlets (101) of the backrest tube (1).

4. The primary wind online measurement device according to claim 3, characterized in that: The pressure difference measuring mechanism further comprises two connecting pipes (303), and the two ends of the U-shaped differential pressure gauge (301) are respectively connected to the two air outlets (101) of the backrest pipe (1) through the connecting pipes (303), and each connecting pipe (303) is provided with a second control valve (302) for controlling the circulation of gas in the connecting pipe (303).

5. The primary wind online measurement device according to claim 1, characterized in that: The primary air online measurement device comprises a driving mechanism arranged on the primary air duct (6), and the driving mechanism is used to drive the backrest tube (1) to move along the radial direction of the primary air duct (6).

6. The primary wind online measurement device according to claim 5, characterized in that: The driving mechanism comprises a driver (402) and a slide rail (403); the slide rail (403) is arranged to extend along the axial direction of the backrest tube (1); a sliding member (404) that can slide along the slide rail (403) is arranged on the slide rail (403); the sliding member (404) is fixedly connected to the backrest tube (1); the driver (402) is arranged to be able to drive the sliding member (404) to slide along the slide rail (403), thereby driving the backrest tube (1) to move along its axial direction.

7. The primary wind online measurement device according to claim 6, characterized in that: The driver (402) includes an electric cylinder, and the driving mechanism also includes a push rod (405), one end of the push rod (405) is connected to the electric cylinder, and the other end is connected to the sliding member (404), and the electric cylinder drives the sliding member (404) to slide along the slide rail (403) by lifting or sinking the push rod (405).

8. The primary wind online measurement device according to claim 1, characterized in that: A sealing mechanism is provided between the backrest tube (1) and the primary air duct (6).

9. The primary wind online measurement device according to claim 8, characterized in that: The sealing mechanism comprises a first sealing component and a second sealing component arranged on the first sealing component, the first sealing component being used to seal the connection between the backrest tube (1) and the primary air duct (6), the second sealing component being used to seal the connection between the first sealing component and the backrest tube (1), and the second sealing component fixing the first sealing component on the primary air duct (6).

10. The primary wind online measurement device according to claim 9, characterized in that: The first sealing component includes a sealing ring (501), the second sealing component includes a pneumatic sealing member (502), and the primary air online measuring device also includes a fastener, wherein the fastener fixes the pneumatic sealing member (502) and the sealing ring (501) on the primary air duct (6), and the pneumatic sealing member (502) is connected to a second gas delivery pipe (503), and the second gas delivery pipe (503) is provided with a third control valve (504) for controlling the flow of gas in the second gas delivery pipe (503).

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