A dry-type coal gas holder piston seal wear detection device and method

Abstract

The present application belongs to the technical field of coal gas holder, and particularly relates to a dry-type coal gas holder piston sealing wear detection device and method, which comprises a mounting frame, a measuring box mounted on the mounting frame, and an extraction handle; the extraction handle is detachably connected with the measuring box and the mounting frame; the measuring box comprises an open-top cuboid shell, a gauge block is arranged in the shell, one end of the gauge block is connected with a side wall of the shell through a spring, and the side wall opposite to the side wall is provided with an opening, the opening allows a part of the gauge block to extend out of the shell through the opening; a gland is arranged on the top of the measuring box. The coal gas holder piston sealing wear online detection device can measure the sealing rubber strip wear condition under the normal operation of the coal gas holder, and the original operation process is unchanged, so that online detection is realized.

Description

Technical Field

[0001] This invention belongs to the field of gas holder technology, specifically relating to a device and method for detecting piston seal wear in a dry gas holder. Background Technology

[0002] A gas holder is a steel container for storing industrial and domestic coal gas. There are two main types: wet gas holders and dry gas holders. Among them, dry gas holders have advantages such as stable gas pressure, meeting the needs of occasions with high gas pressure requirements, small footprint, relatively low civil engineering foundation costs, long service life, and low operation and maintenance costs.

[0003] The piston is one of the key components of a dry gas holder, isolating the gas inside from the outside environment to achieve sealed gas storage. There are various piston structures; for example, the piston in a MAN-type gas holder is flat, while the piston in a Krono-type gas holder is spherical. The sealing device is the crucial component for achieving a tight seal in a dry gas holder, preventing gas leakage through the gap between the piston and the holder body. Common sealing devices include thin oil seals, dry oil seals, and rubber diaphragm seals.

[0004] During normal operation of the gas holder, the sealing oil level in the piston groove is adjusted to ensure that the pressure at the sealing strip is slightly higher than the gas pressure, thus sealing the gas below the sealing strip. At this time, the sealing oil slowly leaks through the contact surface between the sealing strip and the holder wall to the bottom groove. The oil pump then pumps the sealing oil from the top of the gas holder into the piston groove, maintaining the oil level in the piston groove and creating circulation. When the sealing strip wears down, gaps form between it and the holder wall, increasing the flow rate of the sealing oil in the piston groove towards the bottom groove. When the flow rate exceeds the pump's replenishment rate, the oil level in the piston groove drops. If the gas pressure exceeds the sealing oil pressure, gas leakage will occur.

[0005] The wear degree of the sealing strip is a crucial parameter affecting the sealing of the gas holder. How to detect the wear of the sealing strip in the shortest possible time is an urgent problem to be solved. Traditional methods require shutting down the gas holder, replacing the gas inside with air (with an oxygen content meeting the standard of 19.5%-23.5%), draining all the sealing oil from the piston groove into the bottom groove, opening the sealing strip inspection manhole for measurement, a process that takes 15-20 days. Summary of the Invention

[0006] To address the technical problems existing in the prior art, the present invention provides a device and method for detecting piston seal wear in dry gas holders.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A device for detecting piston seal wear in a dry gas holder includes a mounting frame, a measuring box mounted on the mounting frame, and an extraction handle; the extraction handle is detachably connected to the measuring box and the mounting frame. The measuring box includes a cuboid shell with an open top, a gauge block inside the shell, one end of the gauge block being connected to a side wall of the shell by a spring, and an opening on the side wall opposite to the side wall, allowing a portion of the gauge block to extend out of the shell through the opening; the top of the measuring box is provided with a pressure cap.

[0008] Preferably, the mounting bracket includes a base plate and three side plates. The size and shape of the mounting bracket are adapted to the measuring box and can accommodate the measuring box. The base plate of the mounting bracket has a first bolt hole, and the back plate has mounting holes. The mounting bracket is fixed to the piston sealing strip frame with bolts through the mounting holes, thereby achieving synchronous movement between the mounting bracket and the piston sealing strip.

[0009] Preferably, the mounting bracket is made of welded steel plates, with the side plates having a thickness of δ=6mm and the bottom plate having a thickness of δ=20mm.

[0010] Preferably, the extraction handle includes a horizontally arranged handle and a longitudinal lead screw connected to the handle, the tail of which has an external thread. Preferably, the length of the extraction handle is set according to the oil level in the piston groove of the gas holder, and the extraction handle should preferably be 400mm above the sealing oil level.

[0011] Preferably, the gauge block is cast from melted lead. One end of the gauge block connected to the spring is flat; the other end in contact with the gas holder wall is curved. The pressure of the spring ensures tight contact between the gauge block and the gas holder wall.

[0012] Preferably, the measuring box further includes a pressure cap located above the gauge block to prevent the gauge block from protruding upwards. The pressure cap can be connected to the side wall of the measuring box using various connection methods such as welding, screw connection, and snap-fit ​​connection.

[0013] Preferably, the bottom plate of the measuring box is provided with a second bolt hole, and the cover is provided with a third bolt hole.

[0014] Preferably, the first bolt hole of the mounting bracket, the second bolt hole at the bottom of the measuring box, and the third bolt hole on the pressure cap are the same size and concentric; the external thread of the lead screw engages with the internal threads of the first bolt hole on the mounting bracket, the second bolt hole on the measuring box, and the third bolt hole on the pressure cap. The lead screw is connected to the third bolt hole on the pressure cap via the thread, and passes through the interior of the measuring box, connecting to the second bolt hole on the bottom plate of the measuring box and the first bolt hole on the mounting bracket, thus achieving a detachable connection between the extraction handle and the measuring box and the mounting bracket. By rotating the handle of the extraction handle, the extraction handle can be connected or separated from the mounting bracket, thereby allowing the measuring box to be removed and installed, facilitating the detection of piston wear.

[0015] Preferably, the two side plates of the mounting bracket are positioning plates, with the same height as the extraction handle. Each positioning plate has a positioning groove at its upper end. The projections of the two positioning grooves onto the first bolt hole, second bolt hole, or third bolt on the same horizontal plane are aligned on the same straight line. That is, when installing the measuring box, aligning the handle of the extraction handle with the positioning grooves allows for quick positioning and installation. This invention also provides a detection method using the above-mentioned online detection device for gas holder piston seals, comprising the following steps: (1) Use the gas holder overhaul opportunity to fix the mounting frame of the gas holder piston seal wear detection device onto the piston sealing strip frame; (2) Install the measuring box on the mounting frame by extracting the handle, so that the gauge block contacts the gas holder wall, and measure and record the thickness of the gauge block; (3) After the piston oil groove is filled with oil, observe that the extraction handle is above the sealing oil surface for easy operation; (4) After the gas holder has been running for a period of time, the operator enters the piston through the top cage under normal operating conditions. The operator holds the handle of the extraction handle with both hands and rotates it counterclockwise. After the screw of the extraction handle exits the first bolt hole on the mounting frame, the measuring box separates from the mounting frame. The extraction handle and the measuring box are then lifted out together. The thickness of the measuring block is measured and compared with the original data to calculate the wear of the gas holder's sealing strip.

[0016] (5) After the measurement is completed, reinstall the measuring box back into the mounting bracket.

[0017] Preferably, the thickness mentioned in step (1) refers to the vertical distance from the position where the gauge block contacts the cabinet wall to the contact surface between the gauge block and the spring.

[0018] Preferably, in step (5), the wear amount is calculated as (measured thickness - original thickness) / original thickness × 100%. Based on the wear amount, the sealing strip is replaced or the gap between the sealing strip and the wall panel is reduced by increasing the angle of the sealing weight.

[0019] Beneficial effects: Compared with the prior art, the present invention has at least the following advantages and beneficial effects: (1) The traditional method requires shutting down the gas holder, replacing the gas inside with air, and ensuring the oxygen content meets the standard of 19.5%-23.5%. All the sealing oil in the piston groove is then drained into the bottom groove, and the manhole is opened to inspect the seal strip for measurement. This process takes 15-20 days. The online detection device for piston seal wear of the gas holder described in this invention can measure the wear of the sealing strip under normal operating conditions of the gas holder, without altering the original operating process, thus achieving online detection.

[0020] (2) This device and method are simple and easy to implement, and can realize the rapid disassembly and installation of the measuring box, thereby enabling rapid detection and judgment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the mounting bracket structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the mounting bracket structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the measuring box described in this invention; Figure 4 This is a schematic diagram of the internal structure of the measuring box described in this invention; Figure 5 This is a structural schematic diagram of the installation or removal process of the measuring box of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1-Mounting hole; 2-First bolt hole; 3-Spring; 4-Second bolt hole; 5-Gauge block; 6-Third bolt hole; 7-Lifting handle; 8-Measuring box; 9-Opening; 10-Cover; 11-Mounting bracket; 12-Positioning plate; 13-Positioning groove. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention, are illustrative embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention.

[0024] Example 1 This invention provides a gas holder piston seal wear detection device, such as... Figure 1 , Figure 3-5 As shown, it includes a mounting frame 11, a measuring box 8 mounted on the mounting frame 11, and an extraction handle 7; the extraction handle 7 is detachably connected to the measuring box 8 and the mounting frame 11. The measuring box 8 includes a cuboid shell with an open top. A measuring block 5 is provided inside the shell. One end of the measuring block 5 is connected to a side wall of the shell by a spring 3. An opening 9 is provided on the side wall opposite to the side wall, allowing a part of the measuring block 5 to extend out of the shell through the opening 9. A pressure cap 10 is provided on the top of the measuring box 8.

[0025] The mounting frame 11 includes a base plate and three side plates. The size and shape of the mounting frame 11 are adapted to accommodate the measuring box 8. The base plate of the mounting frame 11 has a first bolt hole 2, and the back plate has mounting holes 1. The mounting frame 11 is fixed to the piston sealing strip frame using bolts through the mounting holes 1, enabling synchronous movement between the mounting frame 11 and the piston sealing strip. The mounting frame 11 is made of welded steel plates, with the side plates having a thickness of δ=6mm and the base plate having a thickness of δ=20mm.

[0026] The extraction handle 7 includes a horizontally arranged handle and a longitudinal lead screw connected to the handle, with an external thread at the end of the lead screw. Preferably, the length of the extraction handle 7 is set according to the oil level in the piston oil groove of the gas holder, and the extraction handle 7 should preferably be 400mm above the sealing oil level.

[0027] The gauge block 5 is cast from melted lead. One end of the gauge block 5 connected to the spring 3 is flat; the other end in contact with the gas holder wall is curved. The pressure of the spring 3 ensures tight contact between the gauge block 5 and the gas holder wall. The measuring box 8 also includes a pressure cap 10, located above the gauge block 5 to prevent it from protruding upwards. The pressure cap 10 can be connected to the side wall of the measuring box using various connection methods such as welding, screw connection, and snap-fit ​​connection. The bottom plate of the measuring box 8 has a second bolt hole 4, and the pressure cap 10 has a third bolt hole 6.

[0028] The first bolt hole 2 on the mounting bracket 11, the second bolt hole 4 at the bottom of the measuring box 8, and the third bolt hole 6 on the pressure cover 10 are all the same size and concentric. The external thread of the lead screw engages with the internal threads of the first bolt hole 2 on the mounting bracket 11, the second bolt hole 4 on the measuring box 8, and the third bolt hole 6 on the pressure cover 10. The lead screw is connected to the third bolt hole 6 on the pressure cover 10 via the thread, and passes through the interior of the measuring box 8, connecting with the second bolt hole 4 on the bottom plate of the measuring box 8 and the first bolt hole 2 on the mounting bracket 11, thus achieving a detachable connection between the extraction handle 7 and the measuring box 8 and the mounting bracket 11. By rotating the handle of the extraction handle 7, the extraction handle 7 can be connected or separated from the mounting bracket 11, thereby allowing the measuring box 8 to be removed and installed, facilitating the detection of piston wear.

[0029] The detection method using the above-mentioned online detection device for gas holder piston seals includes the following steps: (1) Use the gas holder overhaul opportunity to fix the mounting bracket 11 of the gas holder piston seal wear detection device onto the piston sealing strip frame; (2) Install the measuring box 8 on the mounting bracket 11 through the extraction handle 7, so that the measuring block 5 contacts the gas holder wall, and measure and record the thickness of the measuring block 5. The thickness refers to the vertical distance from the position where the measuring block 5 contacts the cabinet wall to the contact surface between the measuring block 5 and the spring. (3) After the piston oil groove is filled with oil, observe that the extraction handle 7 is above the sealing oil surface, so that it is easy for personnel to operate; (4) After the gas holder has been in operation for 6 months, the operator enters the piston through the top hoist cage under normal operating conditions. The operator holds the handle of the extraction handle 7 with both hands and rotates it counterclockwise. After the lead screw of the extraction handle 7 exits the first bolt hole 2 on the mounting frame 11, the measuring box 8 separates from the mounting frame 11. The extraction handle 7 and the measuring box 8 are then lifted out together. The thickness of the measuring block is measured and compared with the original data to calculate the wear of the gas holder's sealing strip. Wear amount = (measured thickness - original thickness) / original thickness × 100%. When the wear amount reaches 25%-35%, the sealing strip is replaced. When it is less than 25%, the gap between the sealing strip and the wall panel is reduced by increasing the angle of the sealing weight.

[0030] (5) After the measurement is completed, reinstall the measuring box 8 back into the mounting bracket 11.

[0031] Example 2 This embodiment provides another structure of the above-mentioned detection device, such as... Figure 2-5 As shown, the difference lies in that the two side plates of the mounting bracket 11 are positioning plates 12, and the upper end of the positioning plate 12 is provided with positioning grooves 13. The projections of the two positioning grooves 13 and the first bolt hole 2 / second bolt hole 4 / third bolt 6 on the same horizontal plane are located on the same straight line. That is, when installing the measuring box 8, the handle of the extraction handle 7 can be aligned with the positioning grooves 13 to achieve quick positioning and installation.

Claims

1. A device for detecting wear of a gas holder piston seal, characterized in that, It includes a mounting frame (11), a measuring box (8) mounted on the mounting frame (11), and an extraction handle (7); the extraction handle (7) is detachably connected to the measuring box (8) and the mounting frame (11); The measuring box (8) includes a cuboid shell with an open top, and a gauge block (5) is provided inside the shell. One end of the gauge block (5) is connected to a side wall of the shell by a spring (3). The side wall opposite to the side wall has an opening (9), which allows a part of the gauge block (5) to extend out of the shell through the opening (9). The top of the measuring box (8) is provided with a pressure cap (10). The mounting bracket (11) is fixed on the piston sealing strip frame, and the mounting bracket (11) moves synchronously with the piston sealing strip.

2. The gas holder piston seal wear detection device according to claim 1, characterized in that, The mounting frame (11) includes a base plate and three side plates. The size and shape of the mounting frame (11) are adapted to the measuring box (8) and can accommodate the measuring box (8). The base plate of the mounting frame (11) is provided with a first bolt hole (2) and the back plate is provided with a mounting hole (1).

3. The gas holder piston seal wear detection device according to claim 1, characterized in that, The extraction handle (7) includes a handle arranged laterally and a longitudinal lead screw connected to the handle, with an external thread at the end of the lead screw.

4. The gas holder piston seal wear detection device according to claim 1, characterized in that, The gauge block (5) is a lead block. One end of the gauge block (5) connected to the spring (3) is a flat surface; the other end in contact with the gas holder wall is an arc surface.

5. The gas holder piston seal wear detection device according to claim 1, characterized in that, The measuring box (8) also includes a pressure cap (10) located above the gauge block (5).

6. The gas holder piston seal wear detection device according to claim 5, characterized in that, The measuring box (8) has a second bolt hole (4) on its bottom plate and a third bolt hole (6) on its cover (10).

7. The gas holder piston seal wear detection device according to claim 3, characterized in that, The first bolt hole (2) of the mounting bracket (11), the second bolt hole (4) at the bottom of the measuring box (8), and the third bolt hole (6) on the pressure cover (10) are the same size and concentric; the external thread of the lead screw is engaged with the internal thread of the first bolt hole (2) on the mounting bracket (11), the second bolt hole (4) on the measuring box (8), and the third bolt hole (6) on the pressure cover (10). The lead screw is connected to the third bolt hole (6) on the pressure cover (10) through the thread and passes through the inside of the measuring box (8). It is connected to the second bolt hole (4) on the bottom plate of the measuring box (8) and the first bolt hole (2) on the mounting bracket (11), so as to realize the detachable connection between the extraction handle (7) and the measuring box (8) and the mounting bracket (11).

8. The gas holder piston seal wear detection device according to claim 1, characterized in that, The two side plates of the mounting bracket (11) are positioning plates (12). Each positioning plate (12) has a positioning groove (13) on its upper end. The projections of the two positioning grooves (13) and the first bolt hole (2), the second bolt hole (4) or the third bolt (6) on the same horizontal plane are on the same straight line.

9. A detection method using the online detection device for gas holder piston seals according to any one of claims 1-8, characterized in that, Includes the following steps: (1) Use the gas holder overhaul opportunity to fix the mounting bracket (11) of the gas holder piston seal wear detection device onto the piston sealing strip frame; (2) Install the measuring box (8) on the mounting frame (11) by lifting the handle (7), so that the gauge block (5) contacts the gas holder wall, and measure and record the thickness of the gauge block (5); (3) After the piston oil groove is filled with oil, observe that the extraction handle (7) is above the sealing oil surface, so that it is easy for personnel to operate; (4) After the gas holder has been running for a period of time, the operator enters the piston through the top cage under normal operating conditions. The operator holds the handle of the extraction handle (7) with both hands and rotates it counterclockwise. After the screw of the extraction handle (7) exits the first bolt hole (2) on the mounting frame (11), the measuring box (8) separates from the mounting frame (11). The extraction handle (7) and the measuring box (8) are then lifted out together. The thickness of the measuring block is measured and compared with the original data to calculate the wear of the gas holder sealing strip. (5) After the measurement is completed, reinstall the measuring box (8) back into the mounting bracket (11).

10. The method according to claim 9, characterized in that, The thickness mentioned in step (1) refers to the vertical distance from the position where the gauge block (5) contacts the cabinet wall to the contact surface between the gauge block (5) and the spring.

11. The method according to claim 9, characterized in that, Step (5) Wear amount = (measured thickness - original thickness) / original thickness × 100%. Based on the wear amount, the sealing strip should be replaced or the gap between the sealing strip and the wall panel should be reduced by increasing the angle of the sealing weight.

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