High temperature filter for a sulfur recovery claus reaction system

Abstract

The utility model relates to a high temperature filter for sulfur recovery Claus reaction system belongs to sulfur recovery technical field, including the filter main body connected with flue waste heat boiler, filter main body in along the air current direction setting has filter core and secondary filter assembly in proper order, still be provided with back flushing subassembly and ultrasonic descaling subassembly in filter main body, ultrasonic descaling subassembly is connected with filter core, back flushing subassembly is located between filter core and secondary filter assembly, and the air outlet of back flushing subassembly faces filter core. The filter core and secondary filter assembly of the utility model can carry out two -stage filtration to the flue gas of sulfur -making combustion furnace in proper order, remove the dust in the flue gas, avoid the impurity solidification deposition in the pipe wall, cause the follow -up condensing cooler heat exchange pipe to be blocked, heat exchange efficiency reduces and so on problem, back flushing subassembly and ultrasonic descaling subassembly can clean filter core, avoid the impurity block filter core.

Description

Technical Field

[0001] The high-temperature filter used in the Claus reaction system for sulfur recovery belongs to the field of sulfur recovery technology. Background Technology

[0002] The classic Claus sulfur production process consists of a primary thermal reaction followed by a secondary (tertiary) catalytic reaction. Existing Claus sulfur recovery units primarily use acidic gas containing H2S as feedstock. This acidic gas is burned in a sulfur production combustion furnace to generate sulfur production process gas. Alkylation waste acid regeneration units are mainly divided into dry and wet processes. Both processes require the use of an incinerator to decompose the waste acid into sulfur dioxide at high temperatures. Simultaneously, the organic matter in the waste sulfuric acid is converted into carbon dioxide and water.

[0003] Compared to sulfur recovery units, alkylation waste acid units have a longer process flow, higher construction investment, higher operating costs and energy consumption, and more cumbersome daily operation and maintenance. If there is a source of fresh acid available at the plant site, introducing alkylation waste acid into the sulfur recovery unit for sulfur production can be considered. The alkylation waste acid is introduced into the sulfur combustion furnace via a waste acid spray gun, where it decomposes into SO2 at high temperature, participating in the subsequent Claus reaction to produce sulfur. However, after the waste acid is introduced into the sulfur combustion furnace of the sulfur recovery unit, impurities such as iron ions are introduced and suspended at high temperatures. Below 480℃, viscous salts are formed and adhere to the pipe walls, leading to problems such as ash accumulation and blockage in subsequent heat exchange equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a high-temperature filter for the Claus reaction system for sulfur recovery that can filter the flue gas after combustion in a convection furnace, thereby preventing the generated suspended matter from clogging the filter element and secondary filter components and avoiding the problem of ash accumulation and clogging in the Houxun heat exchange equipment.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a high-temperature filter for a sulfur recovery Claus reaction system, including a filter body connected to a flue-type waste heat boiler.

[0006] The filter body contains a filter element and a secondary filtration assembly arranged sequentially along the airflow direction. The filter body also contains a backflushing assembly and an ultrasonic descaling assembly. The ultrasonic descaling assembly is connected to the filter element, and the backflushing assembly is located between the filter element and the secondary filtration assembly. The air outlet of the backflushing assembly faces the filter element.

[0007] Furthermore, a tube sheet is provided inside the filter body, the filter element is installed on the tube sheet, and the ultrasonic descaling assembly is connected to the tube sheet.

[0008] Furthermore, the filter elements are arranged side by side with intervals between them.

[0009] Furthermore, the filter element is a cylinder with a closed bottom, and the open end of the filter element is provided with a flared part, and a sealing gasket is provided on the outer wall of the flared part.

[0010] Furthermore, the backflush assembly includes a backflush pipe and air nozzles. One end of the backflush pipe extends into the filter body and is equipped with several air nozzles, which are positioned facing the filter element.

[0011] Furthermore, a conveying auger is provided at the bottom of the filter body.

[0012] Furthermore, an ash collection tank is connected to the discharge end of the conveying auger.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The high-temperature filter element and secondary filtration assembly used in the Claus reaction system for sulfur recovery can sequentially perform secondary filtration on the flue gas from the sulfur combustion furnace to remove dust from the flue gas and prevent impurities from solidifying and depositing on the pipe wall, causing problems such as blockage of the heat exchange tubes of the subsequent condenser cooler and reduced heat exchange efficiency. The backflushing assembly and ultrasonic descaling assembly can clean the filter element to prevent impurities from clogging the filter element. Attached Figure Description

[0015] Figure 1 A schematic diagram showing the connection between the high-temperature filter used in the Claus reaction system for sulfur recovery and the sulfur production combustion furnace and flue-type waste heat boiler.

[0016] Figure 2 This is a schematic diagram of the structure of a high-temperature filter used in a Claus reaction system for sulfur recovery;

[0017] Figure 3 This is a schematic diagram showing the connection between the main unit and the tube sheet of the ultrasonic descaling assembly.

[0018] Figure 4 A schematic diagram of the transducer and waveguide block installation of an ultrasonic descaling assembly;

[0019] Figure 5 This is a front view schematic diagram of the filter element.

[0020] In the diagram: 1. Filter body; 2. Backflush assembly; 3. Filter element; 301. Sealing gasket; 302. Filter element body; 4. Secondary filtration assembly; 5. Conveying auger; 6. Ultrasonic descaling assembly; 601. Main unit; 602. Transducer; 603. Waveguide block; 7. Ash collection bin; 8. Sulfur production combustion furnace; 9. Steam drum; 10. Flue-type waste heat boiler; 11. Tube sheet. Detailed Implementation

[0021] Figures 1-5 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-5 The present invention will be further described below.

[0022] The high-temperature filter for the Claus reaction system for sulfur recovery includes a filter body 1 connected to a flue-type waste heat boiler 10. Inside the filter body 1, a filter element 3 and a secondary filtration assembly 4 are sequentially arranged along the airflow direction. The filter body 1 also includes a backflushing assembly 2 and an ultrasonic descaling assembly 6. The ultrasonic descaling assembly 6 is connected to the filter element 3, and the backflushing assembly 2 is located between the filter element 3 and the secondary filtration assembly 4, with its outlet facing the filter element 3. The filter element 3 and the secondary filtration assembly 4 of this high-temperature filter for the Claus reaction system can sequentially perform secondary filtration of the flue gas from the sulfur-producing combustion furnace 8 to remove dust from the flue gas, preventing impurities from condensing and depositing on the pipe walls, which could cause blockage of the heat exchange tubes in the subsequent condenser cooler and reduce heat exchange efficiency. The backflushing assembly 2 and the ultrasonic descaling assembly 6 can clean the filter element 3, preventing impurities from clogging it.

[0023] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0024] For details, please refer to the instruction manual appendix. Figure 1-5 The flue gas outlet of the sulfur-making combustion furnace 8 is connected in series with the flue-type waste heat boiler 10 and then connected to the air inlet at the bottom of the filter body 1. The top of the filter body 1 is provided with an exhaust port. A steam drum 9 is provided on one side of the flue-type waste heat boiler 10, which uses the heat of the flue gas to generate steam.

[0025] The specific flue-type waste heat boiler 10 is equipped with a coil, and the steam drum 9 is connected to the exhaust port of the coil to generate steam.

[0026] The filter body 1 is a closed cylinder at the top. The top of the filter body 1 is provided with an exhaust port, and the bottom side of the filter body 1 is provided with an air inlet. The air inlet is connected to the flue-type waste heat boiler 10.

[0027] The bottom of the filter body 1 is provided with a collection section, which gradually narrows from top to bottom. A conveying auger 5 is provided at the bottom of the collection section. The top of the conveying auger 5 is connected to the bottom of the collection section. Impurities filtered by the filter element 3 enter the collection section. The impurities in the collection section enter the conveying auger 5 under the action of gravity and are sent out by the conveying auger 5.

[0028] Furthermore, to facilitate the collection of impurities, an ash collection tank 7 is provided below the output end of the conveying auger 5, which can collect the impurities output by the conveying auger 5. A conveying auger 5 is also provided at the bottom of the flue-type waste heat boiler 10, and an ash collection tank 7 is also provided below the output end of the conveying auger 5, so that impurities can be collected.

[0029] A tube sheet 11 is provided inside the filter body 1. The tube sheet 11 is sealed to the inner wall of the filter body 1. The filter element 3 is installed on the tube sheet 11. In this embodiment, several filter elements 3 are arranged side by side and spaced apart, so that the flue gas can be filtered through the filter element 3 and the filtration speed is fast.

[0030] In this embodiment, the filter element 3 includes a filter element body 302 and a sealing gasket 301. The filter element body 302 is a cylinder with a closed lower end. The bottom of the filter element body 302 is a hemispherical shape with a convex center. The open end of the filter element body 302 is provided with a flared portion. The sealing gasket 301 is sleeved on the flared portion. The flared portion of the filter element body 302 presses against the tube sheet 11, and the sealing gasket 301 seals the filter element body 302 and the tube sheet 11.

[0031] The secondary filtration component 4 is installed on top of the filter body 1, and the secondary filtration component 4 can directly use a filter screen.

[0032] The backflush assembly 2 includes a backflush pipe and nozzles. One end of the backflush pipe is connected to compressed air, and the other end extends into the filter body 1 and is equipped with several nozzles, which are positioned facing the interior of the filter element 3. After a period of operation, the filter element 3 can be backflushd with compressed air to clean it. In this embodiment, the filter element 3 is a ceramic fiber filter element.

[0033] The ultrasonic descaling assembly 6 includes a main unit 601, a transducer 602, and a waveguide block 603. The main unit 601 is installed on the inner wall of the filter body 1, and the waveguide block 603 is installed on the transducer 602. The waveguide block 603 is fixedly connected to the tube sheet 11.

[0034] During operation, the process gas from sulfur combustion enters the filter body 1 through the bottom inlet. At this temperature, the process gas temperature is approximately 300℃. At this high temperature, suspended salt-containing impurities gradually deposit as ash. Most of the dust is then filtered by filter element 3, and the process gas, after thorough dust removal by secondary filter assembly 4, enters the downstream Claus reaction system. Industrial air is periodically blown onto the outside of filter element 3 via backflushing assembly 2, causing dust to deposit at the bottom of filter body 1. The dust is then periodically removed online by conveying auger 5. The ultrasonic descaling assembly 6 is energized, keeping filter element 3 in a state of high-frequency microwave vibration, reducing dust deposition on the outer wall of filter element 3 and extending the equipment's service life.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A high-temperature filter for a Claus reaction system for sulfur recovery, characterized in that: Includes a filter body (1) connected to a flue-type waste heat boiler (10); The filter body (1) is provided with a filter element (3) and a secondary filtration assembly (4) arranged in sequence along the airflow direction. The filter body (1) is also provided with a backflush assembly (2) and an ultrasonic descaling assembly (6). The ultrasonic descaling assembly (6) is connected to the filter element (3). The backflush assembly (2) is located between the filter element (3) and the secondary filtration assembly (4). The air outlet of the backflush assembly (2) faces the filter element (3).

2. The high-temperature filter for a Claus reaction system for sulfur recovery according to claim 1, characterized in that: A tube sheet (11) is provided inside the filter body (1), the filter element (3) is installed on the tube sheet (11), and the ultrasonic descaling assembly (6) is connected to the tube sheet (11).

3. The high-temperature filter for a Claus reaction system for sulfur recovery according to claim 1 or 2, characterized in that: The filter element (3) is arranged in a row with several elements spaced apart.

4. The high-temperature filter for a Claus reaction system for sulfur recovery according to claim 1 or 2, characterized in that: The filter element (3) is a cylinder with a closed bottom. The open end of the filter element (3) is provided with a flared part, and a sealing gasket (301) is provided on the outer wall of the flared part.

5. The high-temperature filter for a Claus reaction system for sulfur recovery according to claim 1, characterized in that: The backflush assembly (2) includes a backflush pipe and air nozzles. One end of the backflush pipe extends into the filter body (1) and is equipped with several air nozzles, which are positioned facing the filter element (3).

6. The high-temperature filter for a Claus reaction system for sulfur recovery according to claim 1, characterized in that: A conveying auger (5) is provided at the bottom of the filter body (1).

7. The high-temperature filter for a Claus reaction system for sulfur recovery according to claim 6, characterized in that: A dust collection tank (7) is connected to the discharge end of the conveying auger (5).

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