Anti-blocking device for pressure tapping pipe of boiler furnace

Abstract

An anti-blocking device for a pressure tapping pipe of a boiler furnace comprises the pressure tapping pipe, a detection pipe and a blowback pipe, the pressure tapping pipe is installed on a furnace wall, an anti-blocking structure is arranged at the end of the pressure tapping pipe, the end of the pressure tapping pipe is communicated with the detection pipe and the blowback pipe, the other end of the detection pipe is communicated with a transmitter, and the other end of the blowback pipe is communicated with a high-pressure air source. According to the utility model, scale deposit in the pressure tapping pipeline can be efficiently cleaned through the blowback device, the pressure tapping pipeline can be effectively cleaned by replacing a manual dredging mode on the premise of not influencing the normal operation of the boiler, risks caused by human factors are reduced, and the reliability and the safety of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of furnace pressure detection, in particular to an anti-blocking device for a pressure-taking pipe of a boiler furnace. Background Technique

[0002] With the improvement of the industrial automation level, boilers, as important heat energy conversion equipment, have been widely used in industries such as chemical industry and electric power. In order to ensure the safe and stable operation of boilers, it is necessary to accurately measure the pressure inside the furnace. However, in the actual application process, the root of the pressure-taking pipe of the furnace pressure measurement transmitter often gets blocked due to the accumulation of substances such as dust and impurities, resulting in the inability to accurately transmit the pressure signal, and further affecting the operation state of the entire system.

[0003] Generally, to solve this problem, operators need to regularly manually dredge the pressure-taking pipe to ensure the normal operation of the pressure transmitter. However, this manual dredging method has many drawbacks. First, due to the high-temperature and high-pressure environment inside the boiler, operators face a high risk of scalding during the dredging process; second, frequent manual intervention not only increases the labor intensity, but also may cause instrument damage or inaccurate measurement data due to improper operation, thus affecting the normal indication of the furnace pressure; third, long-term manual intervention will accelerate the aging of the equipment, shorten its service life, and also affect the stability and continuity of the technological process, increasing potential safety hazards. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an anti-blocking device for a pressure-taking pipe of a boiler furnace. This device can efficiently clean the scale in the pressure-taking pipe through an anti-blowing device, and can effectively clean the pressure-taking pipe without affecting the normal operation of the boiler by replacing the manual dredging method, reducing the risks brought by human factors, and improving the reliability and safety of the system.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is:

[0006] An anti-blocking device for a pressure-taking pipe of a boiler furnace includes a pressure-taking pipe, a detection pipe, and an anti-blowing pipe. The pressure-taking pipe is installed on the furnace wall, and an anti-blocking structure is provided at the end of the pressure-taking pipe. The end of the pressure-taking pipe is connected to the detection pipe and the anti-blowing pipe. The other end of the detection pipe is connected to a transmitter, and the other end of the anti-blowing pipe is connected to a high-pressure air source.

[0007] In a preferred solution, a first solenoid valve is provided on the detection pipe, and a second solenoid valve is provided on the anti-blowing pipe. The first solenoid valve and the second solenoid valve are connected to a DCS system through a cable.

[0008] In a preferred solution, a first stop valve is provided on the detection pipe.

[0009] In a preferred embodiment, a second shut-off valve and a pressure reducing valve are provided on the backflush pipe.

[0010] In a preferred embodiment, the anti-blocking structure includes a blocking ball. The blocking ball has a mesh structure and is arranged at the end of the backflush pipe. A top plate is also provided at the port of the backflush pipe. A connecting rod is connected between the lower end surface of the top plate and the outer wall of the backflush pipe. A sliding rod is vertically connected to the center of the top plate. The sliding rod passes through the center of the blocking ball, and the blocking ball slides vertically up and down along the sliding rod.

[0011] In a preferred embodiment, a screw rod is arranged outside the sliding rod. The end of the screw rod is vertically connected to the center of the top plate. A sliding plate is sleeved on the screw rod, and the sliding plate slides freely up and down along the screw rod.

[0012] In a preferred embodiment, an adjusting nut is provided on the upper end surface of the sliding plate. The adjusting nut is threadedly connected to the screw rod. The lower end surface of the sliding plate is connected to the blocking ball through a compression spring.

[0013] A boiler furnace pressure-taking pipe anti-blocking device has the following beneficial effects:

[0014] 1. Through the automatic backflush function of this device, the scale and impurities in the pressure-taking pipeline are effectively removed, avoiding measurement errors caused by blockage, ensuring the continuous accuracy of the furnace negative pressure data, and facilitating the timely discovery and handling of potential safety hazards;

[0015] 2. After adopting this device, there is no need for frequent manual dredging, which simplifies the process flow, reduces the operation difficulty, enables process personnel to focus more on production control rather than cumbersome maintenance work, and improves work efficiency;

[0016] 3. The traditional manual dredging method is prone to damage the instrument, while this device reduces physical damage to the instrument through a non-contact cleaning method, effectively reducing the failure rate, prolonging the service life of the instrument, and reducing the replacement cost;

[0017] 4. By arranging an anti-blocking structure at the end of the pressure-taking pipe, this device can reduce the entry of dust and sundries into the pressure-taking pipe, and cooperate with the tightening and loosening adjustment mechanism to achieve a full protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further illustrates the present invention in conjunction with the drawings and embodiments:

[0019] Figure 1 is the overall system schematic diagram of the present invention;

[0020] Figure 2 is the schematic diagram of the anti-blocking structure of the present invention;

[0021] Figure 3This is a cross-sectional view of the anti-blocking structure of the utility model.

[0022] In the figure: furnace wall 1, pressure-taking pipe 2, detection pipe 3, backflush pipe 4, first solenoid valve 5, second solenoid valve 6, first stop valve 7, transmitter 8, DCS system 9, pressure-reducing valve 10, second stop valve 11, air source 12, cable 13, top plate 14, connecting rod 15, sliding rod 16, plugging ball 17, screw rod 18, sliding plate 19, adjusting nut 20, compression spring 21. Specific implementation mode

[0023] As Figure 1 shown, an anti-blocking device for a boiler furnace pressure-taking pipe includes a pressure-taking pipe 2, a detection pipe 3 and a backflush pipe 4. The pressure-taking pipe 2 is installed on the furnace wall 1. An anti-blocking structure is provided at the end of the pressure-taking pipe 2. The end of the pressure-taking pipe 2 is connected to the detection pipe 3 and the backflush pipe 4. The other end of the detection pipe 3 is connected to the transmitter 8, and the other end of the backflush pipe 4 is connected to a high-pressure air source 12.

[0024] The preferred solution is as Figure 1 shown. A first solenoid valve 5 is provided on the detection pipe 3, and a second solenoid valve 6 is provided on the backflush pipe 4. The first solenoid valve 5 and the second solenoid valve 6 are connected to the DCS system 9 through the cable 13.

[0025] The preferred solution is as Figure 1 shown. A first stop valve 7 is provided on the detection pipe 3.

[0026] The preferred solution is as Figure 1 shown. A second stop valve 11 and a pressure-reducing valve 10 are provided on the backflush pipe 4.

[0027] The working principle of the device is as follows:

[0028] S1. When the device is running normally, the DCS system 9 controls the first solenoid valve 5 and the second solenoid valve 6. At this time, the first solenoid valve 5 is powered on and in a conducting state, and the second solenoid valve 6 is powered off and in a closed state. The high-pressure air source 12 will not affect the detection of the transmitter 8. The inside of the furnace is communicated with the transmitter 8 through the detection pipe 3 to monitor the furnace pressure. When an emergency occurs, the stop valve 7 can be closed to cut off the gas path of the detection pipe 3;

[0029] S2. When it is necessary to clean the pressure-taking pipe 2, the DCS system 9 controls the first solenoid valve 5 and the second solenoid valve 6. At this time, the second solenoid valve 6 is powered on and in a conducting state, and the first solenoid valve 5 is powered off and in a closed state. The air source 12 passes through the pressure-reducing valve 10, and the air source pressure is reduced from 0.7 Mpa to 0.5 Mpa, and the pressure-taking pipe 2 is backflushed and cleaned;

[0030] S3. After reaching the preset value of the backflush time, the DCS system 9 controls the second solenoid valve 6 to close, and after a delay of 3 s, the first solenoid valve 5 is opened, and then the system returns to the normal pressure-taking state.

[0031] The preferred solutions are as follows Figure 2 and Figure 3 shown. The anti-blocking structure includes a blocking ball 17. The blocking ball 17 is of a mesh structure. The blocking ball 17 is arranged at the end of the backwashing pipe 4. A top plate 14 is also arranged at the port of the backwashing pipe 4. A connecting rod 15 is connected between the lower end surface of the top plate 14 and the outer wall of the backwashing pipe 4. A sliding rod 16 is vertically connected to the center of the top plate 14. The sliding rod 16 penetrates through the center of the blocking ball 17. The blocking ball 17 slides vertically up and down along the sliding rod 16. The preferred solutions are as follows Figure 2 and Figure 3 shown. A screw rod 18 is arranged on the outside of the sliding rod 16. The end of the screw rod 18 is vertically connected to the center of the top plate 14. A sliding plate 19 is sleeved on the screw rod 18. The sliding plate 19 slides freely up and down along the screw rod 18. An adjusting nut 20 is arranged on the upper end surface of the sliding plate 19. The adjusting nut 20 is threadedly connected to the screw rod 18. The lower end surface of the sliding plate 19 is connected to the blocking ball 17 through a compression spring 21.

[0032] The operating principle of the anti-blocking structure is as follows: Under normal circumstances, the compression spring 21 pushes the blocking ball 17 to slide down along the sliding rod 16 and block the port of the pressure-taking pipe 2. Since the blocking ball 17 is of a mesh structure and does not affect normal pressure-taking, when the system performs backwashing and cleaning, a large amount of high-pressure gas will be ejected from the backwashing pipe 4. At this time, the air flow will push the blocking ball 17 to slide up and compress the compression spring 21. At this time, the port of the pressure-taking pipe 2 is in an open state and does not affect exhaust. After the backwashing is completed, the blocking ball 17 will continue to block the port of the pressure-taking pipe 2 under the action of the compression spring 21;

[0033] By rotating the adjusting nut 20, the position of the adjusting nut 20 on the screw rod 18 can be changed, thereby adjusting the height of the sliding plate 19, and finally adjusting the pressing degree of the compression spring 21, so as to finely adjust the blocking force of the blocking ball 17 according to the actual on-site use conditions to ensure that the exhaust of the pressure-taking pipe 2 is not affected during the backwashing process.

Claims

1. A device for preventing blockage of a pressure-taking pipe in a boiler furnace, comprising a pressure-taking pipe (2), a detection pipe (3) and a back-blowing pipe (4), characterized in that: The pressure-taking pipe (2) is installed on the furnace wall (1). An anti-blocking structure is provided at the end of the pressure-taking pipe (2). The end of the pressure-taking pipe (2) is connected to the detection pipe (3) and the back-blowing pipe (4). The other end of the detection pipe (3) is connected to the transmitter (8), and the other end of the back-blowing pipe (4) is connected to a high-pressure gas source (12).

2. The anti-blocking device for the pressure-taking pipe of the boiler furnace according to claim 1, characterized in that: A first solenoid valve (5) is provided on the detection pipe (3), and a second solenoid valve (6) is provided on the back-blowing pipe (4). The first solenoid valve (5) and the second solenoid valve (6) are connected to the DCS system (9) through a cable (13).

3. The anti-blocking device for the pressure-taking pipe of the boiler furnace according to claim 1, characterized in that: A first stop valve (7) is provided on the detection pipe (3).

4. The anti-blocking device for the pressure-taking pipe of the boiler furnace according to claim 1, wherein: A second stop valve (11) and a pressure reducing valve (10) are provided on the back-blowing pipe (4).

5. The anti-blocking device for the pressure-taking pipe of the boiler furnace according to claim 1, characterized in that: The anti-blocking structure includes a blocking ball (17). The blocking ball (17) has a mesh structure. The blocking ball (17) is arranged at the end of the back-blowing pipe (4). A top plate (14) is further provided at the port of the back-blowing pipe (4). A connecting rod (15) is connected between the lower end face of the top plate (14) and the outer wall of the back-blowing pipe (4). A sliding rod (16) is vertically connected to the center of the top plate (14). The sliding rod (16) penetrates through the center of the blocking ball (17), and the blocking ball (17) slides vertically up and down along the sliding rod (16).

6. The anti-blocking device for the pressure-taking pipe of the boiler furnace according to claim 5, characterized in that: A screw rod (18) is arranged on the outside of the sliding rod (16). The end of the screw rod (18) is vertically connected to the center of the top plate (14). A sliding plate (19) is sleeved on the screw rod (18), and the sliding plate (19) slides freely up and down along the screw rod (18).

7. The anti-blocking device for the pressure-taking pipe of the boiler furnace according to claim 6, characterized in that: An adjusting nut (20) is provided on the upper end face of the sliding plate (19). The adjusting nut (20) is threadedly connected to the screw rod (18). The lower end face of the sliding plate (19) is connected to the blocking ball (17) through a compression spring (21).

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