Sulfur recovery system in sulfur-containing flue gas

Abstract

This invention relates to the field of industrial flue gas treatment technology and discloses a sulfur recovery system for sulfur-containing flue gas. The system includes a cooling and condensing device, a bag filter, and a tail gas scrubbing system. The cooling and condensing device comprises a high-temperature condensing component, a low-temperature condensing component, a connecting box, and an anti-clogging component. This invention employs a cooling and condensing device composed of a high-temperature condensing component and a low-temperature condensing component. Cooling is performed in stages based on the different phase transition temperatures of sulfur. The high-temperature condensing component initially cools the high-temperature sulfur-containing flue gas to 150-200°C, efficiently condensing most of the sulfur vapor into liquid sulfur. This temperature range ensures sufficient liquefaction of the sulfur vapor while preventing premature solidification and pipe blockage. Subsequently, the low-temperature condensing component further cools the flue gas to 80-120°C, condensing the remaining sulfur vapor into solid sulfur. This staged treatment method can fully recover sulfur from the flue gas, greatly improving the sulfur recovery rate.

Description

Technical Field

[0001] This invention relates to the field of industrial flue gas treatment technology, specifically a sulfur recovery system for sulfur-containing flue gas. Background Technology

[0002] The emission of sulfur-containing flue gas during industrial production is an environmental problem that urgently needs to be addressed. In order to reduce environmental pollution and achieve efficient resource utilization, sulfur recovery from sulfur-containing flue gas has become one of the key research directions.

[0003] Traditional sulfur recovery processes, typically represented by the Claus process, rely heavily on complex chemical reactions. This process involves a series of reaction steps to convert sulfur-containing compounds into sulfur. However, this method has several drawbacks. First, its process flow is complex, involving multiple reaction units and operational stages, which not only increases equipment investment costs but also significantly increases the difficulty of system operation and maintenance. Second, the reaction process requires a large amount of energy to maintain the reaction conditions, resulting in high energy consumption. Furthermore, the Claus process is highly dependent on catalysts to promote the reaction, and the use of catalysts not only increases costs but also requires regular replacement and maintenance. Moreover, the activity of the catalyst is easily affected by various factors, further reducing the stability and reliability of the process.

[0004] In contrast, research on physical methods for direct sulfur recovery is relatively limited. Existing cooling technologies are inefficient in achieving sulfur recovery through sulfur vapor condensation. More critically, temperature control remains a formidable challenge. Improper temperature control can lead to sulfur vapor failing to condense fully and escaping into the atmosphere, causing environmental pollution. Furthermore, excessively low temperatures may cause sulfur to condense prematurely within the pipelines, leading to blockages and severely impacting the system's normal operation.

[0005] Therefore, we propose a sulfur recovery system for sulfur-containing flue gas. Summary of the Invention

[0006] The purpose of this invention is to provide a sulfur recovery system for sulfur-containing flue gas, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sulfur recovery system for sulfur-containing flue gas, comprising:

[0008] A cooling and condensing device, comprising a high-temperature condensing component, a low-temperature condensing component, and a connecting box, wherein the outlet of the high-temperature condensing component is connected to the inlet of the low-temperature condensing component through the connecting box;

[0009] The high-temperature condensation component is used to initially cool the high-temperature sulfur-containing flue gas, so that the sulfur vapor in the high-temperature sulfur-containing flue gas is converted into liquid.

[0010] The low-temperature condensation component is used to further cool the cooled flue gas, so that the remaining sulfur vapor in the flue gas condenses into a solid.

[0011] A sulfur collection device is installed at the bottom of the connecting box to collect liquid sulfur and solid sulfur separately.

[0012] An anti-clogging component is disposed within the low-temperature condensing component, and the anti-clogging component is used to prevent sulfur, which condenses into a solid state, from clogging the low-temperature condensing component.

[0013] A bag filter dust collector, wherein the bag filter dust collector is connected to the exhaust port of the low-temperature condensation component through a tail gas flue;

[0014] The exhaust gas scrubbing system uses an induced draft fan to introduce the exhaust gas filtered by the bag filter into the system, purifying the remaining toxic gases in the exhaust gas. The purified gas is then discharged into the atmosphere after passing the exhaust gas detection system.

[0015] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, the high-temperature condensation component includes a high-temperature flue box, one end of which is connected to a high-temperature flue, and the bottom of which is connected to a high-temperature array tube, the bottom of which is connected to the upper interior of the connecting box.

[0016] The high-temperature array tube is spirally wound with a first heat exchange tube.

[0017] The low-temperature condensation assembly includes a low-temperature smoke box, the exhaust port of which is connected to the exhaust flue, a low-temperature array tube connected to the bottom of the low-temperature smoke box, the bottom of which is connected to the upper interior of the connecting box, and a second heat exchange tube spirally wound on the low-temperature array tube.

[0018] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, a high-temperature section temperature controller is installed inside the connecting box, and a low-temperature section temperature controller is installed inside the low-temperature flue gas box.

[0019] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, the temperature of the exhaust gas entering the connecting box after being cooled by the high-temperature array tube is maintained at 150°C-200°C, and the temperature of the exhaust gas entering the low-temperature flue gas box after being cooled by the low-temperature array tube is maintained at 80°C-120°C.

[0020] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, the sulfur collection device includes a collection funnel, the collection funnel is fixedly installed at the bottom of the connecting box, and two collection funnels are provided, one of which is located directly below the high-temperature array tube and the other of which is located directly below the low-temperature array tube;

[0021] The bottom of each of the two collection funnels is connected to a guide pipe, the bottom of the guide pipe is connected to a sulfur collection tank, the bottom of the sulfur collection tank is connected to a discharge pipe, and a second valve is installed on the discharge pipe.

[0022] A first valve is installed on the guide pipe.

[0023] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, the anti-clogging component includes a rotating rod, which is rotatably installed inside the low-temperature flue box. The interior of the rotating rod is hollow, with a flue gas inlet at the bottom and a flue gas outlet at the top. The flue gas inlet is connected to the interior of the low-temperature array tube, and a scraper is fixedly connected to the bottom of the rotating rod, with the scraper making sliding contact with the inner wall of the low-temperature array tube.

[0024] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, the scraper is optionally arranged in a spiral shape.

[0025] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, the anti-clogging component further includes a driving component, the driving component including a driving motor, the driving motor being fixedly mounted on one side of the low-temperature flue box via a motor mount, the upper end of the rotating rod rotatably penetrating through the top of the low-temperature flue box via a sealed bearing, and synchronous pulleys being fixedly connected to the upper end of the rotating rod and the upper end of the rotating shaft of the driving motor, with adjacent synchronous pulleys being connected by a synchronous belt drive.

[0026] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, a vibration assembly is provided at the lower end of the connecting box, the vibration assembly includes a support base, the support base is frame-shaped, and a vibration motor is fixedly installed on the support base.

[0027] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, a mounting base is further included, the top of which is connected to the support base via a rubber shock-absorbing pad.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] The system employs a cooling and condensing device composed of high-temperature and low-temperature condensing components. Based on the different phase change temperatures of sulfur, it performs staged cooling. The high-temperature condensing component initially cools the high-temperature sulfur-containing flue gas to 150-200℃, allowing most of the sulfur vapor to be efficiently condensed into liquid sulfur. This temperature range ensures that the sulfur vapor is fully liquefied and avoids premature solidification that could clog the pipes. Subsequently, the low-temperature condensing component further cools the flue gas to 80-120℃, allowing the remaining sulfur vapor to be condensed into solid sulfur. This staged treatment method can fully recover sulfur from the flue gas, greatly improving the sulfur recovery rate.

[0030] The rotating rod drives the spiral scraper to rotate on the inner wall of the low-temperature array tube, which can scrape off the attached solid sulfur in a timely and uniform manner, preventing it from accumulating and clogging the pipe. The spiral scraper design can not only peel off solid sulfur more efficiently, but also reduce the resistance during rotation, avoid the occurrence of jamming, and ensure smooth flue gas flow in the system.

[0031] Applying vibration to the connection box by a vibrating motor helps liquid or solid sulfur fall more smoothly into the collection funnel, reduces the adhesion of sulfur to the inner wall of pipes or equipment, reduces the risk of equipment failure due to blockage, and also improves the efficiency of sulfur collection.

[0032] Heat can be collected by using the first and second heat exchange tubes. Attached Figure Description

[0033] Figure 1 This is a flowchart of a sulfur recovery system for sulfur-containing flue gas according to the present invention;

[0034] Figure 2 This is a schematic diagram of the cooling and condensing device in a sulfur recovery system for sulfur-containing flue gas according to the present invention.

[0035] Figure 3 This is a front view schematic diagram of a cooling and condensing device in a sulfur recovery system for sulfur-containing flue gas according to the present invention;

[0036] Figure 4 This is one of the partial structural schematic diagrams of a cooling and condensing device in a sulfur recovery system for sulfur-containing flue gas according to the present invention;

[0037] Figure 5 This is a second partial structural schematic diagram of a cooling and condensing device in a sulfur recovery system for sulfur-containing flue gas according to the present invention;

[0038] Figure 6 This is a partial cross-sectional view of the cooling and condensing device in a sulfur recovery system for sulfur-containing flue gas according to the present invention.

[0039] Figure 7 This is a schematic diagram of the structure of a scraper in a sulfur recovery system for sulfur-containing flue gas according to the present invention.

[0040] In the diagram: 1. High-temperature condensation assembly; 1011. High-temperature flue; 101. High-temperature smoke box; 102. High-temperature array tube; 103. First heat exchange tube;

[0041] 2. Low-temperature condensation assembly; 201. Low-temperature smoke chamber; 2011. Exhaust gas flue; 202. Low-temperature array tube; 203. Second heat exchange tube;

[0042] 3. Connecting box; 301. Collection funnel; 302. Guide pipe; 303. Sulfur collection tank; 304. First valve; 305. Discharge pipe; 306. Second valve;

[0043] 4. Mounting bracket;

[0044] 5. Vibration assembly; 501. Support base; 502. Vibration motor; 503. Rubber shock-absorbing pad;

[0045] 6. High-temperature zone temperature controller;

[0046] 7. Low-temperature range temperature controller;

[0047] 8. Anti-clogging component; 801. Rotating rod; 8011. Smoke inlet; 8012. Smoke outlet; 802. Scraper; 803. Synchronous pulley; 804. Synchronous belt; 805. Drive motor; 806. Motor base; 807. Sealed bearing. Detailed Implementation

[0048] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0049] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0050] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0051] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Example 1

[0053] Please see Figures 1 to 7 This embodiment provides a sulfur recovery system for sulfur-containing flue gas, characterized by comprising: a cooling and condensing device, which includes a high-temperature condensing component 1, a low-temperature condensing component 2, and a connecting box 3; the outlet of the high-temperature condensing component 1 is connected to the inlet of the low-temperature condensing component 2 through the connecting box 3; the high-temperature condensing component 1 is used to initially cool the high-temperature sulfur-containing flue gas, causing the sulfur vapor in the high-temperature sulfur-containing flue gas to turn into a liquid state; the low-temperature condensing component 2 is used to further cool the cooled flue gas, causing the remaining sulfur vapor in the flue gas to condense into a solid state; a sulfur collection device, which is located at the bottom of the connecting box 3, is used to collect liquid sulfur and solid sulfur separately; and an anti-blocking component 8, which is located inside the low-temperature condensing component 2, and is used to prevent the solidified sulfur from blocking the low-temperature condensing component 2.

[0054] The bag filter is connected to the exhaust port of the low-temperature condensing component 2 through the exhaust gas duct 2011.

[0055] The exhaust gas scrubbing system uses an induced draft fan to draw the exhaust gas filtered by the bag filter into the system, where it purifies any remaining toxic gases. The purified gas is then tested and approved by the exhaust gas detection system before being released into the atmosphere.

[0056] In operation, high-temperature sulfur-containing flue gas enters the high-temperature condensing component 1 for initial cooling. At high temperatures, sulfur exists in the flue gas as vapor. As the high-temperature sulfur-containing flue gas flows within the high-temperature condensing component 1, heat is transferred to the cooling medium through heat exchange. As the temperature decreases, when the dew point temperature of the sulfur vapor is reached, the sulfur vapor begins to undergo a phase change, transforming from a gaseous state to a liquid state.

[0057] After initial cooling by the high-temperature condensing component 1, the flue gas, carrying liquid sulfur and residual gaseous components, enters the connecting box 3. The connecting box 3 serves as a transition and buffer, providing a brief residence space for the liquid sulfur, allowing it to separate from the flue gas under gravity and settle downwards. It also provides a relatively stable flow environment for the flue gas subsequently entering the low-temperature condensing component 2.

[0058] The flue gas exiting from the connecting box 3 enters the low-temperature condensing assembly 2 for further cooling. Since some sulfur vapor has already condensed into liquid sulfur in the high-temperature condensing assembly 1, the remaining sulfur vapor content in the flue gas entering the low-temperature condensing assembly 2 is relatively low. However, as the temperature further decreases, when the freezing point of sulfur is reached, the remaining sulfur vapor will directly change from a gaseous state to a solid state. This is because, in a low-temperature environment, the molecular motion of sulfur slows down, and the intermolecular forces increase, allowing sulfur atoms to arrange themselves into a solid crystalline structure.

[0059] A sulfur collection device is located at the bottom of the connecting box 3, designed to separate and collect liquid and solid sulfur. Liquid sulfur, due to gravity, flows from the bottom of the connecting box 3 into the designated section of the sulfur collection device. Solid sulfur, after forming within the low-temperature condensation component 2, may adhere to the inner wall of the pipe as the flue gas flows. Under the action of the gravity-based anti-blocking component 8, it will fall to the bottom of the connecting box 3 and enter the corresponding solid sulfur collection area of ​​the sulfur collection device. This separate collection method facilitates further processing and utilization of sulfur in different states.

[0060] The exhaust gas, after being treated by the low-temperature condensation component 2, enters the bag filter through the exhaust gas duct 2011. The bag filter uses the filtration effect of the filter bags to intercept the solid particles carried in the exhaust gas.

[0061] The exhaust gas, after being filtered by a baghouse dust collector, is introduced into an exhaust gas scrubbing system by an induced draft fan. Besides sulfur, the exhaust gas may also contain other toxic gases (such as sulfur dioxide and hydrogen sulfide). The exhaust gas scrubbing system uses a specific scrubbing liquid (such as an alkaline solution) to ensure sufficient contact with the exhaust gas, utilizing chemical reactions to absorb and transform the toxic gases. For example, sulfur dioxide can react with hydroxide ions in an alkaline solution to form sulfites, thereby reducing the content of toxic gases in the exhaust gas.

[0062] After being purified by the exhaust gas scrubbing system, the gas enters the exhaust gas detection system. This system measures various indicators of the purified gas, such as the concentration of toxic gases and the content of particulate matter. Only when the test results meet relevant national environmental protection standards will the purified gas be released into the atmosphere, thus ensuring that the entire sulfur recovery system does not pollute the environment during operation.

[0063] In this embodiment, the high-temperature condensation assembly 1 includes a high-temperature smoke box 101, one end of which is connected to a high-temperature flue 1011, and the bottom of the high-temperature smoke box 101 is connected to a high-temperature array tube 102. The bottom of the high-temperature array tube 102 is connected to the upper interior of the connecting box 3. A first heat exchange tube 103 is spirally wound on the high-temperature array tube 102. The low-temperature condensation assembly 2 includes a low-temperature smoke box 201, the exhaust port of the low-temperature smoke box 201 is connected to the exhaust flue 2011, the bottom of the low-temperature smoke box 201 is connected to a low-temperature array tube 202, and the bottom of the low-temperature array tube 202 is connected to the upper interior of the connecting box 3. A second heat exchange tube 203 is spirally wound on the low-temperature array tube 202.

[0064] High-temperature sulfur-containing flue gas enters the high-temperature flue box 101 from the high-temperature flue duct 1011, and then enters the high-temperature array tube 102. The cooling medium in the first heat exchange tube 103 cools the flue gas in the high-temperature array tube 102, causing the sulfur vapor to condense into liquid sulfur and flow into the connecting box 3. The cooled flue gas then enters the low-temperature array tube 202 from the connecting box 3. The cooling medium in the second heat exchange tube 203 further cools it, causing the remaining sulfur vapor to condense into solid sulfur.

[0065] In this embodiment, a high-temperature section temperature controller 6 is installed inside the connecting box 3, and a low-temperature section temperature controller 7 is installed inside the low-temperature smoke box 201.

[0066] The high-temperature section temperature controller 6 monitors the temperature inside the connection box 3, controls the temperature and flow rate of the cooling medium in the first heat exchange tube 103, and ensures that the flue gas in the high-temperature array tube 102 is cooled to a suitable temperature so that the sulfur vapor can be smoothly condensed into a liquid state. The low-temperature section temperature controller 7 monitors the temperature inside the low-temperature smoke box 201, controls the temperature and flow rate of the cooling medium in the second heat exchange tube 203, and ensures that the flue gas in the low-temperature array tube 202 is cooled to a temperature that allows the remaining sulfur vapor to condense into a solid state.

[0067] Furthermore, the exhaust gas temperature entering the connection box 3 after being cooled by the high-temperature array tube 102 is maintained at 150℃-200℃, and the exhaust gas temperature entering the low-temperature smoke box 201 after being cooled by the low-temperature array tube 202 is maintained at 80℃-120℃.

[0068] The exhaust gas temperature after cooling the high-temperature array tube 102 is controlled between 150℃ and 200℃. This temperature range ensures that the sulfur vapor is fully condensed into a liquid state, while preventing excessively low temperatures from causing some sulfur vapor to solidify and block the pipes. Similarly, controlling the exhaust gas temperature after cooling the low-temperature array tube 202 to 80℃-120℃ allows the remaining sulfur vapor to condense into a solid state. This temperature also facilitates subsequent exhaust gas treatment and prevents excessively low temperatures from affecting equipment performance or causing other problems.

[0069] For example, at a flue gas flow rate of 25000m³3 The sulfur vapor concentration ranges from 15% to 35% per hour. During system operation, the initial temperature of the cooling water in the high-temperature section is set to 60℃. The high-temperature section temperature controller 6 adjusts the temperature in real time based on the flue gas temperature and sulfur vapor concentration to ensure the tail gas temperature at the outlet of the high-temperature array tube 102 remains stable at approximately 180℃, allowing most of the sulfur vapor to condense into liquid sulfur. The initial temperature of the refrigerant in the low-temperature section is set to 35℃. The low-temperature section temperature controller 7 precisely regulates the temperature to maintain the tail gas temperature at the outlet of the low-temperature array tube 202 at approximately 100℃, allowing the remaining sulfur vapor to fully condense. Testing shows that the sulfur recovery rate reaches 92%, and the purity is 90%.

[0070] For example, in a flue gas flow rate of 35000 m³ / h 3 The sulfur vapor concentration is 25%-35% per hour. The cooling water temperature in the high-temperature section is maintained at 55℃-65℃, accelerating the cooling rate of the flue gas within the high-temperature array tube 102, allowing more sulfur vapor to condense into liquid sulfur in the high-temperature section. The refrigerant temperature in the low-temperature section is maintained at 30℃-35℃, enhancing the condensation effect of the low-temperature condensation component 2, and promoting more complete condensation of the remaining sulfur vapor into solid sulfur. After adjustments, the sulfur recovery rate is increased to 95%, with a purity ≥93%.

[0071] In this embodiment, the sulfur collection device includes a collection funnel 301, which is fixedly installed at the bottom of the connecting box 3. Two collection funnels 301 are provided, one of which is located below the high-temperature array tube 102, and the other is located directly below the low-temperature array tube 202. The bottom of both collection funnels 301 is connected to a guide pipe 302, the bottom of which is connected to a sulfur collection tank 303. The bottom of the sulfur collection tank 303 is connected to a discharge pipe 305, and a second valve 306 is installed on the discharge pipe 305. A first valve 304 is installed on the guide pipe 302.

[0072] Liquid sulfur condensed from the high-temperature array tube 102 and solid sulfur from the low-temperature smoke box 201 fall into their respective collection funnels 301 and enter the sulfur collection tank 303 through the guide pipe 302. When sulfur needs to be discharged, the first valve 304 is closed, and then the second valve 306 is opened, allowing it to be discharged from the discharge pipe 305. This process will not affect the normal operation of the cooling and condensation device.

[0073] In this embodiment, the anti-blocking component 8 includes a rotating rod 801, which is rotatably installed inside the low-temperature smoke box 201. The interior of the rotating rod 801 is hollow. A smoke inlet 8011 is opened at the bottom of the rotating rod 801, and a smoke outlet 8012 is opened at the upper end of the rotating rod 801. The smoke inlet 8011 is connected to the interior of the low-temperature array tube 202. A scraper 802 is fixedly connected to the bottom of the rotating rod 801, and the scraper 802 slides in contact with the inner wall of the low-temperature array tube 202.

[0074] The rotating rod 801 rotates inside the low-temperature smoke chamber 201. The flue gas in the low-temperature array tube 202 enters the rotating rod 801 through the smoke inlet 8011 and then exits through the smoke outlet 8012. The scraper 802 at the bottom of the rotating rod 801 rotates with the rotating rod 801, scraping off the solid sulfur condensed on the inner wall of the low-temperature array tube 202 to prevent solid sulfur from accumulating and clogging the pipe.

[0075] Furthermore, the scraper 802 is arranged in a spiral shape.

[0076] When the spiral scraper 802 rotates, it can make more comprehensive contact with the inner wall of the low-temperature array tube 202. Compared with ordinary scrapers, it is more effective in removing solid sulfur and can more effectively prevent solid sulfur from accumulating locally on the inner wall of the pipe, ensuring the pipe is unobstructed. Moreover, it can squeeze the scraped solid sulfur downwards, allowing it to smoothly enter the connection box 3.

[0077] Furthermore, the anti-blocking component 8 also includes a driving component, which includes a drive motor 805. The drive motor 805 is fixedly installed on one side of the low-temperature smoke box 201 via a motor base 806. The upper end of the rotating rod 801 rotates through the top of the low-temperature smoke box 201 via a sealed bearing 807. The upper end of the rotating rod 801 and the upper end of the shaft of the drive motor 805 are both fixedly connected to a synchronous pulley 803. Two adjacent synchronous pulleys 803 are connected by a synchronous belt 804.

[0078] After the drive motor 805 starts, its shaft drives the synchronous pulley 803 to rotate. Through the synchronous belt 804, the synchronous pulley 803 at the upper end of the rotating rod 801 rotates, thereby driving the rotating rod 801 to rotate, realizing the scraping operation of the scraper 802 on the solid sulfur on the inner wall of the low-temperature array tube 202. The sealed bearing 807 ensures the sealing of the rotating rod 801 during rotation to prevent flue gas leakage.

[0079] In this embodiment, a vibration component 5 is provided at the lower end of the connecting box 3. The vibration component 5 includes a support base 501, which is frame-shaped. A vibration motor 502 is fixedly installed on the support base 501.

[0080] After the vibration motor 502 is started, it generates vibration, which is transmitted to the connecting box 3 through the support base 501. The vibration allows the liquid and solid sulfur in the connecting box 3 to flow more smoothly to the collection funnel 301, preventing sulfur from accumulating in the connecting box 3, and also helps to remove sulfur that may be attached to the inner wall of the connecting box 3.

[0081] In this embodiment, a mounting base 4 is also included, the top of which is connected to a support base 501 via a rubber damping pad 503. The rubber damping pad 503 can reduce the transmission of vibrations generated by the vibration component 5 to the mounting base 4 and other equipment, avoiding the impact of excessive vibration on surrounding equipment and ensuring the stability of the entire system operation.

[0082] Working principle:

[0083] 1. High-temperature sulfur-containing flue gas enters the high-temperature flue box 101 through the high-temperature flue 1011, and then enters the high-temperature array tube 102. The cooling medium in the first heat exchange tube 103 cools the gas, causing the sulfur vapor to condense into liquid sulfur. The liquid sulfur falls through the high-temperature array tube 102 into the corresponding collection funnel 301 at the bottom of the connecting box 3, and then enters the sulfur collection tank 303 through the guide pipe 302. The temperature of the cooled exhaust gas is maintained at 150℃-200℃ before entering the connecting box 3.

[0084] 2. The exhaust gas in the connecting box 3 enters the low-temperature array tube 202. The cooling medium in the second heat exchange tube 203 further cools the exhaust gas, causing the remaining sulfur vapor to condense into solid sulfur. The drive motor 805 of the anti-blocking component 8 drives the rotating rod 801 and the scraper 802 to rotate, scraping off the solid sulfur from the inner wall of the low-temperature array tube 202, causing it to fall into another collection funnel 301 at the bottom of the connecting box 3, and then into the sulfur collection tank 303 through the guide pipe 302. The cooled exhaust gas temperature is maintained at 80℃-120℃ before entering the low-temperature smoke box 201.

[0085] 3. The exhaust gas in the low-temperature smoke chamber 201 enters the bag filter through the exhaust gas duct 2011 to remove dust. Then, the exhaust gas enters the exhaust gas scrubbing system by an induced draft fan to purify the toxic gases. After the purified gas passes the exhaust gas detection system, it is discharged into the atmosphere.

[0086] 4. When sulfur needs to be discharged, close the first valve 304 and then open the second valve 306 to discharge the sulfur from the sulfur collection tank 303.

[0087] All parts not described in this invention are the same as or can be implemented using existing technology. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sulfur recovery system for sulfur-containing flue gas, characterized in that, include: The cooling and condensing device includes a high-temperature condensing component (1), a low-temperature condensing component (2), and a connecting box (3). The outlet of the high-temperature condensing component (1) is connected to the inlet of the low-temperature condensing component (2) through the connecting box (3). The high-temperature condensation component (1) is used to initially cool the high-temperature sulfur-containing flue gas, so that the sulfur vapor in the high-temperature sulfur-containing flue gas is converted into liquid. The low-temperature condensation component (2) is used to further cool the cooled flue gas, so that the remaining sulfur vapor in the flue gas condenses into a solid. A sulfur collection device is installed at the bottom of the connecting box (3) for the separate collection of liquid sulfur and solid sulfur. Anti-blocking component (8), the anti-blocking component (8) is disposed in the low temperature condensation component (2), the anti-blocking component (8) is used to prevent sulfur condensed into solid state from blocking the low temperature condensation component (2). A bag filter dust collector, wherein the bag filter dust collector is connected to the exhaust port of the low-temperature condensation component (2) through a tail gas flue (2011); The exhaust gas scrubbing system uses an induced draft fan to introduce the exhaust gas filtered by the bag filter into the exhaust gas scrubbing system to purify the remaining toxic gases in the exhaust gas. The purified gas is then discharged into the atmosphere after passing the exhaust gas detection system. The high-temperature condensation component (1) includes a high-temperature smoke box (101), one end of which is connected to a high-temperature flue (1011), and the bottom of the high-temperature smoke box (101) is connected to a high-temperature array tube (102). The bottom of the high-temperature array tube (102) is connected to the upper interior of the connecting box (3). The high-temperature array tube (102) is spirally wound with a first heat exchange tube (103). The low-temperature condensation assembly (2) includes a low-temperature smoke box (201), the exhaust port of the low-temperature smoke box (201) is connected to the exhaust flue (2011), the bottom of the low-temperature smoke box (201) is connected to a low-temperature array tube (202), the bottom of the low-temperature array tube (202) is connected to the upper interior of the connecting box (3), and a second heat exchange tube (203) is spirally wound on the low-temperature array tube (202). The sulfur collection device includes a collection funnel (301), which is fixedly installed at the bottom of the connecting box (3). There are two collection funnels (301), one of which is located directly below the high-temperature array tube (102), and the other is located directly below the low-temperature array tube (202). The bottom of both collection funnels (301) is connected to a guide pipe (302), the bottom of which is connected to a sulfur collection tank (303). The bottom of the sulfur collection tank (303) is connected to a discharge pipe (305), and a second valve (306) is installed on the discharge pipe (305). A first valve (304) is installed on the guide pipe (302). The anti-clogging component (8) includes a rotating rod (801), which is rotatably installed inside the low-temperature smoke box (201). The interior of the rotating rod (801) is hollow. A smoke inlet (8011) is provided at the bottom of the rotating rod (801), and a smoke outlet (8012) is provided at the upper end of the rotating rod (801). The smoke inlet (8011) is connected to the interior of the low-temperature array tube (202). A scraper (802) is fixedly connected to the bottom of the rotating rod (801), and the scraper (802) slides in contact with the inner wall of the low-temperature array tube (202). The lower end of the connecting box (3) is provided with a vibration component (5), the vibration component (5) includes a support base (501), the support base (501) is frame-shaped, and a vibration motor (502) is fixedly installed on the support base (501).

2. The sulfur recovery system for sulfur-containing flue gas according to claim 1, characterized in that: The high-temperature section temperature controller (6) is installed inside the connecting box (3), and the low-temperature section temperature controller (7) is installed inside the low-temperature smoke box (201).

3. A sulfur recovery system for sulfur-containing flue gas according to claim 2, characterized in that: The exhaust gas temperature entering the connection box (3) after being cooled by the high-temperature array tube (102) is maintained at 150℃-200℃, and the exhaust gas temperature entering the low-temperature smoke box (201) after being cooled by the low-temperature array tube (202) is maintained at 80℃-120℃.

4. A sulfur recovery system for sulfur-containing flue gas according to claim 1, characterized in that: The scraper (802) is arranged in a spiral shape.

5. A sulfur recovery system for sulfur-containing flue gas according to claim 1, characterized in that: The anti-blocking component (8) also includes a driving component, which includes a drive motor (805). The drive motor (805) is fixedly installed on one side of the low-temperature smoke box (201) via a motor base (806). The upper end of the rotating rod (801) rotates through the top of the low-temperature smoke box (201) via a sealed bearing (807). The upper end of the rotating rod (801) and the upper end of the shaft of the drive motor (805) are both fixedly connected to a synchronous pulley (803). Two adjacent synchronous pulleys (803) are connected by a synchronous belt (804).

6. A sulfur recovery system for sulfur-containing flue gas according to claim 1, characterized in that: It also includes a mounting base (4), the top of which is connected to the support base (501) via a rubber shock-absorbing pad (503).

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