A high performance overpressure protector for water sealed gas drainers

Abstract

A high-performance overpressure protector of water-sealed gas drainer is a leakage prevention device for water-sealed gas drainers. The existing problems of the technology, such as not resistant to large water impact, existence of "dead zone" before overpressure protection action, easy to produce blockage and "pressure holding", etc. are solved. The technical scheme is that when the condensate liquid passes through, the channel is opened by the liquid buoyancy, the liquid water is normally discharged, when the gas enters the device, the channel is closed, the outlet is cut off by using the pressure difference formed by the gas before and after the baffle, and the basic functions of passing water and breaking off gas are realized; at the same time, a series of technical means such as setting water seal pipe, backflushing plate, dustproof ring, floating plate and micro water seal are adopted to solve various existing practical problems.

Description

Technical Field

[0001] This technology relates to the field of metallurgical gas drainer equipment technology, and specifically to a high-performance overpressure protector for a water-sealed gas drainer. Background Technology

[0002] Currently, water-sealed gas drainers still dominate the condensate drainage equipment used in pipelines for metallurgical gas (blast furnace gas pipelines, converter gas pipelines, coke oven gas, etc.). To ensure the safety of these drainers, it is recommended to equip them with gas leak-proof devices. The significance of these devices lies in the fact that when the gas pressure in the pipeline suddenly increases, instantaneously exceeding the effective water seal height of the drainer, or when the water seal height is insufficient due to water loss in the drainer, the gas may break through the water seal, causing a large amount of gas and water to overflow, resulting in serious consequences of gas leakage.

[0003] Based on existing literature and similar products on the market, the technology disclosed by the right holder CN213872233U "An Overpressure Protection and Breakdown Prevention Device for Water-Sealed Gas Drainer" has some shortcomings: a) When the gas just breaks through the water seal, due to the existence of the "dead zone", there is a possibility of a small amount of gas leakage before shutdown; b) When a large amount of condensate is suddenly discharged unevenly, the internal components of the protector may be impacted and mistakenly shut down; c) When the gas contains a lot of particulate impurities, the internal piston and screen holes are easily blocked, reducing the drainage capacity; d) Various situations can cause internal gas backlog and "pressure buildup", leading to the device closing mistakenly.

[0004] The main technical principle of this invention is as follows: when condensate passes through, the buoyancy generated by the liquid opens the channel, allowing the liquid water to drain normally. When gas enters the device, the channel is sealed, and the pressure difference formed by the gas in front of and behind the baffle cuts off the outlet, realizing the basic principle of water passing through and gas disconnecting. Corresponding technical means are also adopted to realize other intended functions of the device.

[0005] The specific solution is as follows: A large water seal pipe is installed to generate a water seal static pressure "threshold." Once the gas breaks through the water seal, the outlet is quickly closed, improving the sensitivity of the closure. An anti-impact baffle is installed inside the protector cylinder to guide the flow and eliminate the impact of large water volumes on internal working components. A horizontal fixed dustproof ring is installed on the inner wall of the protector cylinder to prevent solid particles from clogging the gap between the protector piston and the cylinder. Several through holes are arranged in the middle partition of the piston to solve the problem of easy clogging of the partition screen holes. The lower edge of the piston is slightly lower than the upper edge of the outlet short pipe, forming a miniature water seal. This is to both relieve pressure and prevent pressure buildup, and to ensure zero gas leakage when the water seal breaks through. A float plate is installed at the through hole position of the middle partition of the piston to close the channel; when condensate flows through, the buoyancy generated by the liquid causes the float plate to rise and open the piston partition channel, allowing the condensate to be discharged normally; it also has the function of opening the outlet. When gas enters this device, or when coal gas punctures the water seal float and falls to close the channel, the pressure difference created by the gas before and after the baffle cuts off the outlet, achieving the basic function of allowing passage when encountering water and disconnecting when encountering gas. The circumference of the float is machined with a concave spiral, causing it to rotate during its ascent, thus serving to clean solid particles and impurities.

[0006] The main components of the device include: body, water seal pipe, guide bend, upper flange cover, lower flange, anti-impact plate, cylinder, boom, dustproof ring, piston, float plate, pad, baffle, outlet assembly, splash guard, screw, ball nut, compression spring, and sealing gasket.

[0007] The main body refers to the gas drainer itself. The main body typically contains multiple chambers. If the chamber connected to the condensate inlet is considered the first chamber, then the chamber connected to the condensate outlet is the final chamber. This device is installed on the main body; more precisely, part of the device is installed in the final chamber of the main body, and part is externally mounted to the outside of the drainer body.

[0008] The water seal pipe is located in the final chamber of the main body. The water seal pipe is an inverted L-shaped pipe. The lower end of the vertical section is suspended and faces downward, perpendicular to the bottom plate of the final chamber. The horizontal section extends outward across the wall of the final chamber and connects to the guide bend.

[0009] An impact plate is installed parallel to the upper flange cover. The impact plate is fixed to the bottom surface of the upper flange cover by a hanger. The impact plate coincides with the center line of the cylinder and is placed inside the cylinder.

[0010] The cylinder body is a cylindrical hollow cylinder with a cylinder bottom plate at the bottom. The cylinder body axis is vertical. The upper end of the cylinder body is fixedly connected to the lower flange. The cylinder bottom plate is connected to the center of the outlet assembly. The bottom plate is fixedly connected to the bottom of the cylinder bottom plate. The outlet assembly and the bottom plate coincide with the center line of the cylinder body and are in a vertical state.

[0011] The function of the dust ring is to prevent solid particles in the condensate from entering the gap between the inner wall of the cylinder and the outer wall of the piston, thus hindering the piston's movement. The outer diameter of the dust ring is equal to the inner diameter of the cylinder, and the inner diameter is slightly smaller than the outer diameter of the piston cylinder wall. The dust ring is horizontally arranged inside the cylinder, positioned slightly above the upper edge of the piston cylinder wall.

[0012] The outlet assembly is a combination of a short tube and a bracket, located at the center of the cylinder bottom plate. The centerline of the short tube coincides with the centerline of the cylinder block, and the lower end of the short tube is horizontally fixed to the bracket. The bracket is a strip-shaped frame or cross with a central through hole, the purpose of which is to install a positioning screw.

[0013] The piston is an H-shaped cylinder with a middle partition plate, located inside the cylinder body. The outer diameter of the cylinder is slightly smaller than the inner diameter of the cylinder body. Several through holes are provided on the piston middle partition plate. The upper part of the piston middle partition plate and the piston cylinder wall is concave and holds a float plate. The lower edge of the piston cylinder wall is slightly lower than the upper opening of the outlet assembly short pipe. The piston centerline coincides with the cylinder body centerline.

[0014] The float plate is disc-shaped and is a non-metallic cylinder with a density of less than 1. It has a through hole in the center and the outer contour of the float plate should be smaller than the inner diameter of the piston cylinder wall. The circumference of the float plate is machined with a concave spiral. The float plate is placed horizontally on top of the piston intermediate partition, completely covering the through hole on the piston intermediate partition, and the center line of the float plate is required to coincide with the center line of the piston.

[0015] The gasket is disc-shaped, and its outer contour dimensions should be smaller than those of the baffle. The surface of the gasket should be horizontal. The baffle is disc-shaped, with a diameter smaller than that of the piston diaphragm but larger than that of the gasket. A sealing gasket is attached to the lower surface of the baffle as a sealing element.

[0016] The piston, gasket, baffle, and sealing gasket are connected in series from top to bottom by a screw and then fixed together with a nut to form an assembly. The centerline of this assembly coincides with the cylinder body.

[0017] The upper end of the aforementioned assembly screw passes through a float plate, and the lower end of the screw passes through a compression spring. The lower end of the screw passes through the central through-hole of the outlet component bracket, and the compression spring supports it on the outlet component bracket. The lower end of the screw protrudes from the cylinder bottom plate and is fitted with a ball nut. A nut is installed at the top of the screw. Therefore, the assembly is suspended by the compression spring, and the ball nut serves to indicate the working position of the piston.

[0018] The overall outline of the device is Π-shaped when viewed from the front, while the outline of the external part is inverted L-shaped. Attached Figure Description

[0019] Figure 1 Gas drainer body 1 and installation diagram of this device. Figure 2 This is a frontal sectional view. Figure 3 This is a single-piece drawing of piston 7. Figure 4 Floating plate 8 single piece drawing. Figure 5 Device operation status diagram.

[0020] 1. Body, 2. Water seal pipe, 3. Guide bend, 4. Upper flange cover, 4.1. Anti-impact plate, 4.2. Hanger rod, 5. Lower flange, 6. Cylinder body, 6.1. Dustproof ring, 7. Piston, 7.1. Intermediate partition plate, 8. Float plate, 9. Gasket, 10. Baffle plate, 11. Outlet assembly, 11.1. Short pipe, 11.2. Bracket, 12. Splash guard, 13. Screw, 14. Ball nut, 15. Compression spring, 16.1. Lower nut, 16.2. Middle nut, 16.3. Upper nut, 17. Sealing gasket, 18. Assembly. Detailed Implementation

[0021] During the use of the device, the float plate 8 can change with the water level and sit on the middle partition plate 7.1 of the piston 7. When no drainage is needed, the float plate 8 sits on the middle partition plate 7.1 and covers the through hole of the middle partition plate 7.1, which acts as a shut-off. When drainage is needed, the float plate 8 floats up and opens the channel of the middle partition plate 7.1.

[0022] An inverted L-shaped water seal pipe 2 is installed in the end chamber of the main body 1. The lower end of the vertical section of the water seal pipe 2 is suspended and facing downwards. The horizontal section of the water seal pipe 2 is connected to the guide bend 3. The guide bend 3 is then connected to and passes through the flange cover 4 on the cylinder body 6. Inside the cylinder body 6, an impact plate 4.1, a dustproof ring 6.1, an H-type piston 7, a float plate 8, and an assembly 18 are installed. The piston 7, gasket 9, baffle 10, and sealing gasket 17 are connected in series from top to bottom by a screw 13, and connected by a lower nut 16.1 and a middle nut 16.1. 6.2 The components are assembled into a unit 18. The lower end of the screw 13 of the unit 18 is inserted into the compression spring 15. The lower end of the screw 13 passes through the central through hole of the bracket 11.2 of the outlet component 11. The compression spring 15 is located on the bracket 11.2 of the outlet component 11 and supports the unit 18. The lower end of the screw 13 protrudes from the cylinder 6 and is fitted with a ball nut 14. The upper end of the screw 13 is fitted with a nut 16.3. Therefore, the unit 18 and the float 8 are suspended by the compression spring 15 and can rise and fall along the center line of the cylinder 6.

[0023] Under normal production conditions, condensate from the end chamber of the main body enters from the bottom of the vertical section of the water seal pipe 2. When the liquid level in the water seal pipe 2 is higher than that in the guide bend 3, the condensate in the already filled water seal pipe 2, under the action of equal pressure, enters the cylinder 6 through the guide bend 3. Inside the cylinder 6, it is blocked by the anti-impact plate 4.1, and the water flow direction changes from vertical downward to horizontal. Then, the water flows into the concave space of the piston 7, the water level rises, causing the float 8 to rise spirally. The condensate flows through the through hole of the partition plate 7.1 in the middle of the piston 7, flows through the edge of the baffle 10, reaches the bottom of the cylinder 6, and then overflows through the short pipe 11.1 of the outlet assembly 11 and is discharged. If a large volume of water occurs, because the water flow is changed by the anti-impact plate 4.1, it will not have a strong impact on the assembly 18. Moreover, the large volume of water causes the float 8 to rise to the upper limit, raising the piston 7 and increasing the outlet area of ​​the device, thus ensuring the normal passage of large volumes of water. The presence of the dustproof ring 6.1 prevents condensate from flowing through the gap between the inner wall of the cylinder 6 and the piston 7, thus avoiding the problem of solid particles in the condensate depositing on the cylinder 6 and causing the piston 7 to jam. The lower edge of the H-shaped piston 7 is lower than the outlet assembly 11 short pipe 11.1, forming a micro water seal, which has a dual function. On the one hand, the non-condensable gas generated by liquid evaporation in the drain body forms a micro pressure, which can break through the micro water seal and release the non-condensable gas. On the other hand, it prevents the leakage of a small amount of gas when there is a gas rupture. When the pipeline gas pressure momentarily exceeds the limit, or when water is lost from the drainer and the water seal height is insufficient, the gas breaks through the water seal pipe 2, and the gas pressure reaches the "threshold". At this time, the float plate 8 falls, sealing the channel of the partition plate 7.1 in the piston 7. The gas with the "threshold" pressure enters the cylinder 6, creating a pressure difference above and below the partition plate 7.1 in the piston 7. This pressure difference is sufficient to make the piston 7 overcome the elastic force of the compression spring 15 and move down quickly. The sealing gasket 17 falls on the upper end of the short pipe 11.1 of the outlet assembly 11 and seals the pipe opening, achieving complete closure of the outlet, thus completing the overpressure self-closing protection process of the drainer. This device has comprehensive functions, and tests and use have shown that its effect is ideal.

Claims

1. A high-performance overpressure protector for a water-sealed gas drainer, used as a leak prevention device for water-sealed gas drainers; its components include a drainer body (1), a guide bend (3), and a cylinder (6) for housing working parts; the outlet assembly (11) is a combination of a short pipe (11.1) and a bracket (11.2), arranged at the center of the cylinder bottom plate; characterized in that: A water seal pipe (2) is set in the final chamber of the main body (1), and the upper end is connected to a guide bend pipe (3) to guide the condensate into the cylinder (6). After entering the cylinder (6), the condensate flow is first blocked by the anti-impact plate (4.1) set in the cylinder (6), changing the direction of the water flow from vertical downward to horizontal. The anti-impact plate (4.1) is installed parallel to the upper flange cover (4). A horizontal fixed dustproof ring (6.1) is set on the inner wall of the cylinder (6) at a position slightly higher than the upper edge of the piston (7) cylinder wall. The piston (7) is an H-shaped cylinder with a middle partition plate (7.1), and several through holes are arranged on the middle partition plate (7.1). The lower edge of the piston (7) cylinder wall is slightly lower than the upper edge of the outlet assembly (11) short pipe (11.1). A float plate (8) is placed in the upper U-shaped groove of the piston (7), and the circumference of the float plate (8) is... The contour is machined into a concave spiral line, and the float (8) covers the through hole on the middle partition (7.1) of the piston (7); the piston (7), pad (9), baffle (10) and sealing gasket (17) in the cylinder (6) are connected in series from top to bottom by the screw (13), and fixed into a combination (18) by the lower nut (16.1) and the middle nut (16.2); the upper end of the screw (13) of this combination (18) passes through the float (8), the lower end of the screw (13) passes through the compression spring (15), and then the lower end of the screw (13) passes through the central through hole of the bracket (11.2) of the outlet assembly (11), and the compression spring (15) is located on the bracket (11.2) of the outlet assembly (11). Therefore, the combination (18) and the float (8) are supported and suspended by the compression spring (15), and can rise and fall along the center line of the cylinder (6).

2. A high-performance overpressure protector for the water-sealed gas drainer according to claim 1, characterized in that... The water seal pipe (2) is located inside the end chamber of the main body (1). It is an inverted L-shaped pipe with a vertical section length of more than 100mm. Its lower pipe opening is suspended and faces downward. The center line of the pipe is perpendicular to the bottom plate of the end chamber of the main body (1).

3. A high-performance overpressure protector for the water-sealed gas drainer according to claim 1, characterized in that... The impact plate (4.1) parallel to the upper flange cover (4) is fixed to the bottom surface of the upper flange cover (4) by the hanger (4.2). The impact plate (4.1) coincides with the center line of the cylinder body (6) and is placed inside the cylinder body (6).

4. A high-performance overpressure protector for a water-sealed gas drainer according to claim 1, characterized in that... The piston (7) is an H-shaped cylinder with an outer diameter slightly smaller than the inner diameter of the cylinder (6). Several through holes are provided on the middle partition (7.1), each with a diameter greater than 10 mm. The lower edge of the piston (7) cylinder wall is slightly lower than the upper opening of the outlet assembly (11) short pipe (11.1), forming a miniature water seal. The center line of the piston (7) coincides with the center line of the cylinder (6).

5. A high-performance overpressure protector for a water-sealed gas drainer according to claim 1, characterized in that... The lower end of the screw (13) on the assembly (18) extends out of the bottom plate of the cylinder (6), and a ball nut (14) is installed at the end of the screw (13).

6. A high-performance overpressure protector for a water-sealed gas drainer according to claim 1, characterized in that... One end of the splash guard (12) is fixedly installed under the bottom plate of the cylinder body (6) and coincides with the center line of the cylinder body (6) in order to prevent the overflow water discharged from the cylinder body (6) from splashing.

7. A high-performance overpressure protector for a water-sealed gas drainer according to claim 1, characterized in that... The float plate (8) is disc-shaped with a through hole in the center. The float plate (8) is a non-metallic cylinder with a density of less than 1. The circumferential contour of the float plate (8) is machined with a concave spiral line. The surface of the float plate (8) is horizontal.

Images