Reverse blowing anti-blocking device for boiler bed pressure sampling pipeline

Abstract

The utility model discloses a back-blowing anti-blocking device for a boiler bed pressure sampling pipeline, which relates to the technical field of anti-blocking of a boiler sampling pipe and comprises a sampling pipe, a connecting end, a back-blowing anti-blocking mechanism, an electromagnetic valve, an air pressure reducer and a time controller. During debugging before use, the electromagnetic valve is controlled by the time controller to be opened for a long time, so that external air enters the back-blowing anti-blocking device through the air pressure reducer and the electromagnetic valve, and the purging gas purges the sampling pipe after passing through the compensation pipe and the pressure pipe, so that the purposes of measuring the bed pressure of the boiler and back-blowing and blocking prevention are achieved; the pressure of an external air source is adjusted through the air pressure reducer, the front and back positions of a blowing pipe of the back-blowing anti-blocking mechanism are adjusted until the pressure tapping pipe can correctly display the bed pressure of the boiler, and then the time controller is adjusted to the needed interval time and blowing time. A connecting flange is additionally arranged in the middle of the compensation pipe of the blowback anti-blocking mechanism, so that the internal conditions of the sampling pipe and the compensation chamber are convenient to check and clean.

Description

Technical Field

[0001] This utility model relates to the field of boiler sampling pipe anti-clogging technology, specifically to a boiler bed pressure sampling pipe modification backflushing anti-clogging device. Background Technology

[0002] In layman's terms, a thermal power boiler is a boiler used by a power plant to generate electricity. They generally have a large capacity, with the current main unit being 600MW. The more advanced type is the ultra-supercritical boiler, which can reach a capacity of 1000MW. There are two main types of thermal power boilers: pulverized coal boilers and circulating fluidized bed boilers. During the combustion process, a large amount of dust is generated. Long-term accumulation can lead to blockage of the boiler bed pressure sampling tube. Minor blockages can be cleared manually with compressed air. Severe blockages require shutdown for unblocking, which prevents normal bed pressure measurement and seriously affects production.

[0003] A Chinese patent with authorization announcement number CN204008233U discloses an anti-clogging backflush sampling device, which is installed in the flow and surge sampler pipeline of an induced draft fan. Its features include: an air source distribution box, two samplers, a solenoid valve, a timer relay, a switch, and an air source pipeline. Each sampler includes: a rotating metal plate, a collection tube to be discharged, and a pressure tapping tube. The air source distribution box is connected to the collection tube to be discharged via the air source pipeline. The rotating metal plate is installed in the lower middle part of the collection tube. The pressure tapping tube is installed on the air source pipeline above the collection tube. The solenoid valve and the switch are electrically connected and installed in the air source pipeline above the sampler. The timer relay and the switch are electrically connected. The design uses a metal plate to block dust from entering the instrument pipe, and the solenoid valve opens periodically to blow away the accumulated dust.

[0004] The shortcomings of the above-mentioned existing technical solutions are as follows: the metal sheet is designed to block dust from entering the instrument tube, and the solenoid valve is opened periodically to blow away the accumulated dust. However, in actual use, the metal sheet cannot effectively block the dust, and in the process of blowing the dust out, it will also prevent the dust from leaving the instrument tube. Utility Model Content

[0005] The purpose of this utility model is to provide a boiler bed pressure sampling pipeline modification backflushing anti-clogging device to solve the technical problem that the metal sheet in the prior art cannot effectively block dust, and will block the dust from leaving the instrument tube during the dust blowing process.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0007] A boiler bed pressure sampling pipeline modification backflushing and anti-clogging device includes:

[0008] Boiler bed bottom, boiler furnace wall is provided on the side of the boiler bed bottom, air cap is provided on the boiler bed bottom, and sampling tube is installed at an angle on the boiler furnace wall, with a connection end fixedly connected to the sampling tube;

[0009] The backflush anti-clogging mechanism includes a compensation pipe, one end of which is connected to a pressure pipe, and the other end of which is equipped with a connecting component. A purge pipe is sleeved on the connecting component, and a pressure tapping pipe is connected to the purge pipe. The pressure pipe is connected to the sampling pipe through the connecting end.

[0010] The air source control box is connected to the purge pipe.

[0011] As a further embodiment of this utility model, a compensation chamber is provided inside the compensation tube.

[0012] As a further embodiment of this utility model: the gas source control box is equipped with a solenoid valve, an air pressure reducer, and a time controller, all of which are fixedly installed inside the gas source control box.

[0013] As a further embodiment of this utility model: the air pressure regulators are connected to the solenoid valves, the solenoid valves are connected to the purge pipes, and the time controller is electrically connected to the solenoid valves.

[0014] As a further embodiment of this invention: a transmitter is connected to the pressure tapping tube.

[0015] As a further embodiment of this utility model: the compensation pipe includes a main cavity pipe and a reducing pipe, the main cavity pipe and the reducing pipe are connected, and a connecting flange is provided between the main cavity pipe and the reducing pipe.

[0016] As a further embodiment of this utility model: the main cavity tube and the reducing pipe are connected by a connecting flange, the connecting assembly is set on the main cavity tube, and the pressure pipe is set on the reducing pipe.

[0017] As a further embodiment of this utility model, the axial cross-section of the variable diameter pipe is tapered.

[0018] As a further embodiment of this utility model, the connecting component includes a fixed pipe and an adjusting pipe, wherein the fixed pipe is sleeved through and fixedly connected to the outer shell of the compensating pipe.

[0019] As a further embodiment of this utility model: the adjusting pipe fitting is sleeved and threadedly connected to the inner wall of the fixed pipe fitting, and the purging pipe is sleeved and snapped onto the inner wall of the adjusting pipe fitting.

[0020] The beneficial effects of this utility model are:

[0021] 1. This utility model controls the solenoid valve to open for 10 seconds by a time controller, so that external air enters the back-flushing anti-blocking device through the air pressure reducer and the solenoid valve. The purging gas purifies the sampling tube after passing through the compensation tube and the pressure tube, thereby achieving the purpose of measuring the boiler bed pressure and back-flushing to prevent blockage.

[0022] 2. During the pre-use debugging of this utility model, the solenoid valve is kept open for an extended period using a time controller. The external air source pressure is adjusted using an air pressure reducer, and the position of the backflush anti-blocking mechanism's purge pipe is adjusted until the pressure tapping pipe correctly displays the boiler bed pressure. Then, the time controller is adjusted to the required interval and purge time. A connecting flange is installed in the middle of the compensation pipe of the backflush anti-blocking mechanism to facilitate inspection of the sampling pipe and the internal condition of the compensation chamber, and to facilitate cleaning. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the anti-clogging mechanism of this utility model;

[0026] Figure 3 This is a three-dimensional structural diagram of the connecting component of this utility model;

[0027] Figure 4 This is a schematic diagram of the adjusting pipe structure of the connecting assembly of this utility model.

[0028] In the diagram: 1. Sampling tube; 2. Connecting end; 3. Backflush anti-blocking mechanism; 31. Pressure tube; 32. Compensation tube; 321. Compensation chamber; 33. Pressure tapping tube; 34. Connecting assembly; 341. Sleeve tube; 342. Connecting thread; 343. Snap-fit ​​plate; 344. Snap-fit ​​protrusion one; 345. Snap-fit ​​protrusion two; 346. Adjusting tube; 347. Snap-fit ​​tube; 348. Rotating ring handle; 35. Purge tube; 36. Connecting flange; 4. Transmitter; 5. Solenoid valve; 6. Air pressure reducer; 7. Time controller; 8. Boiler furnace wall; 9. Boiler bed bottom; 10. Air cap. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1-4 As shown, a boiler bed pressure sampling pipeline modification backflushing anti-clogging device includes a boiler bed bottom 9, a backflushing anti-clogging mechanism 3, and a gas source control box. A boiler furnace wall 8 is provided on the side of the boiler bed bottom 9, and an air cap 10 is provided on the boiler bed bottom 9. An inclined sampling pipe 1 is provided on the boiler furnace wall 8, and a connecting end 2 is fixedly connected to the sampling pipe 1. The backflushing anti-clogging mechanism 3 includes a compensation pipe 32. One end of the compensation pipe 32 is connected to a pressure pipe 31, and a connecting component 34 is provided on the other end of the compensation pipe 32. A purge pipe 35 is sleeved on the connecting component 34, and a pressure tapping pipe 33 is connected to the purge pipe 35. The pressure pipe 31 is connected to the sampling pipe 1 through the connecting end 2. The gas source control box is connected to the purge pipe 35.

[0031] In some specific embodiments, a compensation chamber 321 is provided inside the compensation tube 32.

[0032] The gas source control box is equipped with a solenoid valve 5, an air pressure reducer 6, and a time controller 7. The solenoid valve 5, the air pressure reducer 6, and the time controller 7 are all fixedly installed inside the gas source control box. The solenoid valve 5 is connected to the air pressure reducer 6. The solenoid valve 5 is connected to the purge pipe 35. The time controller 7 is electrically connected to the solenoid valve 5.

[0033] In some specific implementations, a transmitter 4 is connected to the pressure tap 33.

[0034] The compensation pipe 32 includes a main cavity pipe and a reducing pipe, which are connected to each other. A connecting flange 36 is provided between the main cavity pipe and the reducing pipe. The main cavity pipe and the reducing pipe are connected through the connecting flange 36. A connecting assembly 34 is provided on the main cavity pipe, and a pressure pipe 31 is provided on the reducing pipe.

[0035] In some specific implementations, the axial cross-section of the variable diameter pipe is tapered.

[0036] The connecting assembly 34 includes a fixed pipe fitting and an adjusting pipe fitting. The fixed pipe fitting is sleeved through and fixedly connected to the outer shell of the compensating pipe 32. The adjusting pipe fitting is sleeved and threadedly connected to the inner wall of the fixed pipe fitting. The purging pipe 35 is sleeved and snapped into the inner wall of the adjusting pipe fitting.

[0037] The regulating fitting includes a sleeve pipe 341. A snap-fit ​​plate 343 is evenly distributed and fixedly connected to one end face of the sleeve pipe 341. A rotating ring handle 348 is fixedly connected to the other end face of the sleeve pipe 341. A snap-fit ​​protrusion 344 is fixedly connected to the outer end face of the snap-fit ​​plate 343. A snap-fit ​​protrusion 345 is fixedly connected to the inner end face of the snap-fit ​​plate 343. A purge pipe 35 is sleeved on the inner side of the sleeve pipe 341, the rotating ring handle 348, and the evenly distributed snap-fit ​​plate 343.

[0038] The fixed pipe fitting includes an adjusting pipe 346, on which a clamping pipe 347 is coaxially fixedly connected.

[0039] The outer end face of the sleeve 341 is provided with a connecting thread 342, and the inner pipe of the regulating pipe 346 is provided with an adjusting thread corresponding to the connecting thread 342. The regulating pipe 346 and the sleeve 341 are connected by the connecting thread 342 and the adjusting thread.

[0040] In use, the relative position between the fixed pipe and the adjusting pipe is adjusted by rotating the ring handle 348 to rotate the adjusting pipe. When the clamping pipe 347 is tightly abutted against the clamping protrusion 344 on the clamping plate 343, the clamping protrusion 345 on the clamping plate 343 clamps and fixes the purge pipe 35. When the clamping pipe 347 is separated from the clamping protrusion 344 on the clamping plate 343, the installation position of the purge pipe 35 can be freely adjusted.

[0041] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios:

[0042] During operation, the time controller 7 controls the solenoid valve 5 to open for 10 seconds, allowing external air to enter the backflushing anti-blocking device 3 through the air pressure reducer 6 and the solenoid valve 5. The purging gas passes through the compensation pipe 32 and the pressure pipe 31 to purge the sampling pipe 1, thereby achieving the purpose of measuring the boiler bed pressure and backflushing to prevent blockage. During pre-use debugging, the time controller 7 controls the solenoid valve 5 to remain open for an extended period, and the air pressure reducer 6 is used to adjust the pressure of the external air source. The position of the backflushing anti-blocking mechanism 3's purging pipe 35 is adjusted until the pressure tapping pipe 33 can correctly display the boiler bed pressure. Then, the time controller 7 is adjusted to the required interval and purging time. A connecting flange 36 is installed in the middle of the compensation pipe 32 of the backflushing anti-blocking mechanism 3 to facilitate inspection of the sampling pipe 1 and the internal condition of the compensation chamber 321, and to facilitate cleaning.

[0043] The foregoing has described several embodiments of this utility model in detail, but these embodiments are not limited thereto and should not be considered as limiting the scope of this utility model. All equivalent changes and improvements made within the scope of the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A boiler bed pressure sampling pipeline modification backflushing anti-clogging device, characterized in that, include: Boiler bed bottom (9), boiler furnace wall (8) is provided on the side of boiler bed bottom (9), wind cap (10) is provided on boiler bed bottom (9), and sampling pipe (1) is installed at an inclination on boiler furnace wall (8), and connecting end (2) is fixedly connected to sampling pipe (1). The backflush anti-blocking mechanism (3) includes a compensation pipe (32), one end of which is connected to a pressure pipe (31), and the other end of which is provided with a connecting component (34). A purge pipe (35) is sleeved on the connecting component (34), and a pressure tapping pipe (33) is connected to the purge pipe (35). The pressure pipe (31) is connected to the sampling pipe (1) through the connecting end (2). The gas source control box is connected to the purge pipe (35).

2. The boiler bed pressure sampling pipeline backflushing and anti-clogging device according to claim 1, characterized in that, A compensation chamber (321) is provided inside the compensation tube (32).

3. The boiler bed pressure sampling pipeline backflushing and anti-clogging device according to claim 1, characterized in that, The air source control box is equipped with a solenoid valve (5), an air pressure reducer (6), and a time controller (7).

4. The boiler bed pressure sampling pipeline backflushing and anti-clogging device according to claim 3, characterized in that, The air pressure regulator (6) is connected to the solenoid valve (5), the solenoid valve (5) is connected to the purge pipe (35), and the time controller (7) is electrically connected to the solenoid valve (5).

5. The boiler bed pressure sampling pipeline backflushing and anti-clogging device according to claim 1, characterized in that, A transmitter (4) is connected to the pressure tap (33).

6. The boiler bed pressure sampling pipeline backflushing and anti-clogging device according to claim 1, characterized in that, The compensation pipe (32) includes a main cavity pipe and a reducing pipe, which are connected to each other, and a connecting flange (36) is provided between the main cavity pipe and the reducing pipe.

7. A boiler bed pressure sampling pipeline modification backflushing and anti-clogging device according to claim 6, characterized in that, The connecting component (34) is located on the main cavity tube, and the pressure tube (31) is located on the reducing pipe.

8. A boiler bed pressure sampling pipeline modification backflushing and anti-clogging device according to claim 6, characterized in that, The axial cross-section of the variable diameter pipe is tapered.

9. A boiler bed pressure sampling pipeline modification backflushing and anti-clogging device according to claim 1, characterized in that, The connecting assembly (34) includes a fixed pipe fitting and an adjusting pipe fitting. The fixed pipe fitting is sleeved through and fixedly connected to the outer shell of the compensating pipe (32).

10. A boiler bed pressure sampling pipeline modification backflush anti-clogging device according to claim 9, characterized in that, The regulating pipe fitting is sleeved and threaded onto the inner wall of the fixed pipe fitting, and the purging pipe (35) is sleeved and snapped onto the inner wall of the regulating pipe fitting.

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