Multistage demister for petrochemical industry

Abstract

The utility model relates to the technical fields of petroleum chemical demister, especially to the multistage demister for petroleum chemical industry, which can effectively enhance the demisting effect, avoid the corrosion caused by the liquid droplet flow out of flue gas carrying to equipment and pipeline etc, improve the service life of equipment, including the riser and outer cylinder, four groups of connecting columns are arranged on the outer wall of riser upper side annular equidistance, the inner wall of outer cylinder is fixedly connected with four groups of connecting column outside, the inner wall of riser is fixedly provided with spiral blade, the inner side of spiral blade is fixedly provided with multiple baffle groups, the top of riser is fixedly and continuously provided with the blanking bushing, multiple gas outlets are arranged on the blanking bushing upper annular equidistance, multiple tangential guide plates are respectively blocked outside multiple gas outlets and are tangent with the outer wall of blanking bushing, multiple spiral guide plates are fixedly arranged on the inner wall of outer cylinder upper annular equidistance, the top of drainage hopper is fixedly connected with the top cover, three exhaust ports are annular equidistantly arranged on the taper surface of drainage hopper and are communicated.

Description

Technical Field

[0001] This utility model relates to the technical field of petrochemical demisters, and in particular to multi-stage demisters for petrochemical applications. Background Technology

[0002] The petrochemical industry, or petrochemical industry for short, generally refers to the chemical industry that uses petroleum and natural gas as raw materials. It has a wide scope and many products. Crude oil is cracked, reformed and separated to provide basic raw materials such as ethylene, propylene, butene, butadiene, benzene, toluene, xylene, naphthalene, etc. From these basic raw materials, various basic organic raw materials such as methanol, formaldehyde, ethanol, acetaldehyde, acetic acid, isopropanol, acetone, phenol, etc. can be produced.

[0003] When demisting flue gas in petrochemical production, petrochemical demisters are required. However, traditional petrochemical demisters have a relatively simple structure and poor demisting effect during use. This can cause flue gas to carry liquid droplets out, resulting in serious corrosion of equipment and pipelines and affecting the service life of the equipment. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a multi-stage demister for petrochemical industry that can effectively enhance the demisting effect, prevent flue gas from carrying liquid droplets out and causing corrosion to equipment and pipelines, and improve the service life of equipment.

[0005] Technical solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage demister for petrochemical applications, comprising a riser pipe and an outer cylinder. Four sets of connecting columns are equidistantly arranged in an annular pattern on the upper side of the outer wall of the riser pipe. The inner wall of the outer cylinder is fixedly connected to the outer side of the four sets of connecting columns. A spiral blade is fixedly arranged on the inner wall of the riser pipe. Multiple sets of baffles are fixedly arranged equidistantly on the inner side of the spiral blade. A sealing hood is fixedly connected to the top of the riser pipe. Multiple sets of air outlets are equidistantly arranged in an annular pattern on the sealing hood. Multiple sets of tangential guide plates are fixedly connected equidistantly in an annular pattern on the outer wall of the sealing hood. The multiple sets of tangential guide plates are respectively positioned outside the multiple sets of air outlets and are tangent to the outer wall of the sealing hood. Multiple sets of spiral guide plates are fixedly arranged equidistantly in an annular pattern on the inner wall of the outer cylinder. A diversion hopper is fixedly connected to the top of the outer cylinder. A top cover is fixedly connected to the top of the diversion hopper. Three sets of exhaust ports are equidistantly arranged in an annular pattern on the conical surface of the diversion hopper.

[0007] Preferably, the outer sides of the spiral blade and the spiral guide plate are fixed to the inner wall of the riser pipe and the inner wall of the outer cylinder by welding, respectively.

[0008] Preferably, multiple sets of baffles are welded vertically at equal intervals and staggered left and right on the inner side of the spiral blade, and the multiple sets of baffles are all arranged with their outer sides facing upwards.

[0009] Preferably, the number of air outlets, tangential guide vanes, and spiral guide vanes is set to five.

[0010] Preferably, the drainage hopper has a funnel-shaped structure, and the top cover has an inverted conical structure.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: During use, flue gas enters the riser pipe through the bottom. Guided by the spiral blades, the flue gas spirals and rises within the riser pipe. The rising flue gas is blocked by baffles. Water mist contained in the flue gas impacts the spiral blades and baffles, causing the water mist to adhere to the spiral blades and baffles during the rising and blocking process, condensing into large droplets that flow downwards. This allows the spiral blades and baffles to perform primary demisting of the flue gas, removing a portion of the water mist. The flue gas continues to rise and flow upwards, entering the hood after reaching the top of the riser pipe. The remaining water mist in the flue gas collides with and adheres to the top of the hood, gradually condensing and growing larger. When the water droplets become so large that their own weight exceeds the combined force of the gas's upward force and the liquid's surface tension, the droplets separate from the top of the hood. Some drip off, while others are entrained by the rising flue gas. The flue gas carrying the droplets then flows horizontally through the outlet to the outside of the hood. Guided by the tangential guide vanes, the flow direction of the flue gas changes. The process involves two-stage demisting of the flue gas. Liquid droplets entrained in the flue gas are captured and drip onto the conical surface at the top of the riser pipe. This demisting, combined with the action of the hood and tangential guide vanes, results in secondary demisting. After being guided by the tangential guide vanes, the flue gas flows circumferentially along the inner wall of the outer cylinder. Then, guided by the spiral guide vanes, the flue gas rotates and rises along the inner wall of the outer cylinder, causing a small amount of liquid droplets to adhere to the spiral guide vanes. As the droplets condense, they slide down the spiral guide vanes. The rising flue gas then enters the space between the guide vanes and the top hood after hitting the bottom of the guide hopper, thus further demisting the flue gas. A very small amount of water mist impacts the bottom of the guide hopper and the top of the inner hood, adhering to them and forming droplets. These droplets then fall into the guide hopper and slide down its sides. The flue gas is then discharged through the exhaust port. Thus, the flue gas undergoes three-stage demisting through the spiral guide plate, guide hopper, and hood. This completes the multi-stage demisting of the flue gas, greatly reducing the mist content and effectively enhancing the demisting effect. It also prevents the flue gas from carrying droplets that could corrode equipment and pipelines, thereby extending the service life of the equipment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the isometric cross-sectional structure of this utility model;

[0014] Figure 3 This is a utility model Figure 2 A schematic diagram of the right-side view structure;

[0015] Figure 4This is a partial isometric sectional view of the present invention.

[0016] Figure 5 This is a schematic diagram of the isometric cross-sectional structure of the outer cylinder in this utility model;

[0017] The following are labels in the attached diagram: 1. Riser pipe; 2. Outer cylinder; 3. Connecting column; 4. Spiral blade; 5. Baffle; 6. Seal cover; 7. Air outlet; 8. Tangential guide plate; 9. Spiral guide plate; 10. Drainage bucket; 11. Top cover; 12. Exhaust port. Detailed Implementation

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0019] Example

[0020] Please see Figures 1-5This utility model discloses a multi-stage demister for petrochemical applications, comprising a riser pipe 1 and an outer cylinder 2. Four sets of connecting columns 3 are equidistantly arranged in an annular pattern on the upper side of the outer wall of the riser pipe 1. The inner wall of the outer cylinder 2 is fixedly connected to the outer side of the four sets of connecting columns 3. A spiral blade 4 is fixedly arranged on the inner wall of the riser pipe 1, and multiple sets of baffles 5 are equidistantly arranged on the inner side of the spiral blade 4. A sealing cover 6 is fixedly connected to the top of the riser pipe 1, and multiple sets of air outlets 7 are equidistantly arranged in an annular pattern on the sealing cover 6. Multiple sets of tangential guide plates 8 are equidistantly connected in an annular pattern on the outer wall of the sealing cover 6, each blocking the multiple sets of air outlets 7 and tangential to the outer wall of the sealing cover 6. Multiple sets of spiral guide plates 9 are equidistantly arranged in an annular pattern on the inner wall of the outer cylinder 2, and a diversion bucket 10 is fixedly connected to the top of the outer cylinder 2. A top cover 11 is fixedly connected to the top, and three sets of exhaust ports 12 are equidistantly arranged in a ring on the conical surface of the diversion hopper 10. In use, flue gas enters the riser pipe 1 through the bottom. Guided by the spiral blades 4, the flue gas spirals upwards along the spiral blades 4 within the riser pipe 1. The rising flue gas is blocked by baffles 5. Water mist in the flue gas impacts the spiral blades 4 and baffles 5, causing the water mist to adhere to the spiral blades 4 and baffles 5 during the rising and blocking process, condensing into large droplets that flow downwards. This allows the spiral blades 4 and baffles 5 to perform primary demisting of the flue gas. The flue gas, having removed some of the water mist, continues to rise upwards until it reaches the top of the riser pipe 1, where it enters the sealing hood 6. The remaining water mist in the flue gas collides with the top of the sealing hood 6 and... Adhering to the surface, the droplets gradually condense and grow larger. When their own weight exceeds the combined force of the gas's upward force and the liquid's surface tension, the droplets separate from the top of the inner part of the hood 6. Some drop off, while others are entrained by the rising flue gas. The flue gas carrying the droplets then flows horizontally through the outlet 7 to the outside of the hood 6. Under the guidance of the tangential guide plate 8, the flow direction of the flue gas changes, and the droplets entrained in the flue gas are captured and then drip onto the conical surface at the top of the riser pipe 1. Thus, under the action of the hood 6 and the tangential guide plate 8, the flue gas undergoes secondary demisting. After being guided by the tangential guide plate 8, the flue gas flows circumferentially along the inner wall of the outer cylinder 2. Then, guided by the spiral guide plate 9, the flue gas rotates and rises along the inner wall of the outer cylinder 2, causing the flue gas to... A small amount of liquid droplets adhere to the spiral guide plate 9 and slide down as the droplets condense. The rising flue gas hits the bottom of the guide hopper 10 and enters the space between the guide hopper 10 and the top cover 11. This causes a very small amount of water mist in the flue gas to collide with the bottom of the guide hopper 10 and the top inside of the top cover 11 and adhere to them, forming droplets that fall into the guide hopper 10 and slide down along the guide hopper 10. The flue gas is then discharged to the outside through the exhaust port 12. Thus, the flue gas undergoes three-stage demisting under the action of the spiral guide plate 9, the guide hopper 10, and the top cover 11. This completes the multi-stage demisting of the flue gas, greatly reducing the mist content in the flue gas, thereby effectively enhancing the demisting effect, preventing the flue gas from carrying liquid droplets out and causing corrosion to equipment and pipelines, and improving the service life of the equipment.

[0021] The outer sides of the spiral blade 4 and the spiral guide plate 9 are fixed to the inner wall of the riser pipe 1 and the inner wall of the outer cylinder 2 by welding, respectively. Welding can make the installation of the spiral blade 4 and the spiral guide plate 9 more secure and stable.

[0022] Multiple sets of baffles 5 are vertically and equidistantly welded to the inner side of the spiral blade 4, and the outer sides of the multiple sets of baffles 5 are all inclined upwards. By the staggered distribution of the baffles 5, the direction of the flue gas can be continuously changed, increasing the number of impacts of water mist in the flue gas and improving the blocking effect.

[0023] The number of air outlets 7, tangential guide vanes 8, and spiral guide vanes 9 is set to five.

[0024] The drainage hopper 10 has a funnel-shaped structure, and the top cover 11 has an inverted cone-shaped structure.

[0025] This utility model discloses a multi-stage demister for petrochemical applications. In operation, flue gas enters the riser pipe 1 through the bottom. Guided by the spiral blades 4, the flue gas spirals upwards within the riser pipe 1, and is blocked by baffles 5. Water mist in the flue gas impacts the spiral blades 4 and baffles 5, causing the water mist to adhere to the spiral blades 4 and baffles 5 during the rising and blocking process, condensing into large droplets that flow downwards. This process further facilitates the upward movement of the water mist from the spiral blades 4 and baffles 5. The flue gas undergoes primary demisting, removing some of the water mist. The flue gas continues to rise and flow upwards, entering the sealing hood 6 after reaching the top of the riser pipe 1. The remaining water mist in the flue gas collides with and adheres to the inner top of the sealing hood 6, gradually condensing and growing larger. When the water droplets become so large that their own weight exceeds the combined force of the gas's upward force and the liquid's surface tension, the droplets separate from the inner top of the sealing hood 6. Some drip off, while others are entrained by the rising flue gas. The flue gas carrying the entrained droplets then flows horizontally through the outlet 7 into the sealing hood. Outside the hood 6, the flow direction of the flue gas changes under the guidance of the tangential guide plate 8, and the liquid droplets entrained in the flue gas are captured and then drip onto the conical surface at the top of the riser pipe 1. Thus, the flue gas undergoes secondary demisting under the action of the hood 6 and the tangential guide plate 8. After being guided by the tangential guide plate 8, the flue gas flows circumferentially along the inner wall of the outer cylinder 2. Then, guided by the spiral guide plate 9, the flue gas rotates and rises along the inner wall of the outer cylinder 2, causing a small number of liquid droplets in the flue gas to adhere to the spiral guide plate 9 and flow with the droplets. The rising flue gas condenses and slides down, and after hitting the bottom of the guide hopper 10, it enters the space between the guide hopper 10 and the top cover 11. This causes a very small amount of water mist in the flue gas to collide with the bottom of the guide hopper 10 and the top inside of the top cover 11 and adhere to them, forming droplets that fall into the guide hopper 10 and slide down along the guide hopper 10. The flue gas is then discharged to the outside through the exhaust port 12. Thus, under the action of the spiral guide plate 9, the guide hopper 10 and the top cover 11, the flue gas undergoes three-stage demisting. At this point, the multi-stage demisting of the flue gas is completed.

[0026] The multi-stage demister for petrochemical applications of this utility model can be installed, connected, or set up using common mechanical methods. Any method that can achieve its beneficial effects can be implemented.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-stage demister for petrochemical applications, characterized in that, The system includes a riser pipe (1) and an outer cylinder (2). Four sets of connecting columns (3) are equidistantly arranged in a ring on the upper side of the outer wall of the riser pipe (1). The inner wall of the outer cylinder (2) is fixedly connected to the outer side of the four sets of connecting columns (3). A spiral blade (4) is fixedly arranged on the inner wall of the riser pipe (1). Multiple sets of baffles (5) are fixedly arranged equidistantly on the inner side of the spiral blade (4). A sealing cover (6) is fixedly connected to the top of the riser pipe (1). Multiple sets of air outlets (7) are equidistantly arranged in a ring on the sealing cover (6). The outer side of the sealing cover (6)... Multiple sets of tangential guide plates (8) are fixedly connected in an annular pattern on the wall. The multiple sets of tangential guide plates (8) are blocked outside the multiple sets of air outlets (7) and are tangent to the outer wall of the sealing cover (6). Multiple sets of spiral guide plates (9) are fixedly provided in an annular pattern on the inner wall of the outer cylinder (2). A diversion bucket (10) is fixedly connected to the top of the outer cylinder (2). A top cover (11) is fixedly connected to the top of the diversion bucket (10). Three sets of exhaust ports (12) are connected in an annular pattern on the conical surface of the diversion bucket (10).

2. The multi-stage demister for petrochemical applications as described in claim 1, characterized in that, The outer sides of the spiral blade (4) and the spiral guide plate (9) are fixed to the inner wall of the riser pipe (1) and the inner wall of the outer cylinder (2) by welding, respectively.

3. The multi-stage demister for petrochemical applications as described in claim 2, characterized in that, Multiple sets of baffles (5) are vertically and equidistantly welded to the inside of the spiral blade (4), and the multiple sets of baffles (5) are all arranged with their outer sides facing upwards.

4. The multi-stage demister for petrochemical applications as described in claim 3, characterized in that, The number of the air outlet (7), tangential guide plate (8) and spiral guide plate (9) is set to five.

5. The multi-stage demister for petrochemical applications as described in claim 4, characterized in that, The drainage hopper (10) has a funnel-shaped structure, and the top cover (11) has an inverted cone-shaped structure.

Images