System for recovering sulfur in sulfur-containing flue gas

Abstract

The invention relates to the technical field of industrial flue gas treatment, and discloses a sulfur recovery system in sulfur-containing flue gas, which comprises a cooling condensation device, a bag-type dust collector and a tail gas washing system, the cooling condensation device comprises a high-temperature condensation assembly, a low-temperature condensation assembly, a connecting box and an anti-blocking assembly, the cooling and condensing device composed of the high-temperature condensing assembly and the low-temperature condensing assembly is adopted, graded cooling is carried out according to different phase change temperatures of sulfur, the high-temperature condensing assembly preliminarily cools high-temperature sulfur-containing flue gas to 150-200 DEG C, most sulfur steam is efficiently condensed into liquid sulfur, and the temperature interval ensures that the sulfur steam is fully liquefied, and the sulfur steam is efficiently condensed into liquid sulfur. And then, the flue gas is further cooled to 80-120 DEG C by the low-temperature condensation assembly, so that the residual sulfur steam is condensed into solid sulfur, the sulfur in the flue gas can be fully recovered by the stage treatment mode, and the recovery rate of the sulfur is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial flue gas treatment, in particular to a sulfur recovery system in sulfur-containing flue gas. Background Art

[0002] In the industrial production process, the emission of sulfur-containing flue gas is an environmental problem that needs to be solved urgently. In order to reduce environmental pollution and achieve effective utilization of resources, recovering sulfur from sulfur-containing flue gas has become one of the key research directions.

[0003] Traditional sulfur recovery processes, represented by the Claus process, mainly rely on complex chemical reactions. In this process, a series of reaction steps are required to achieve the conversion from sulfur-containing compounds to sulfur. However, this method has many disadvantages. First, its process flow is relatively complicated, involving multiple reaction units and operating links, which not only increases the equipment investment cost, but also greatly increases the difficulty of system operation and maintenance. Secondly, since the reaction process requires a lot of energy to maintain the reaction conditions, the energy consumption remains high. In addition, the Claus process is also highly dependent on catalysts to promote the reaction. The use of catalysts not only increases costs, but also requires regular replacement and maintenance. At the same time, the activity of the catalyst is easily affected by various factors, further reducing the stability and reliability of the process.

[0004] In contrast, there are relatively few studies on direct physical sulfur recovery. The existing cooling technology is relatively inefficient in the process of realizing sulfur vapor condensation and sulfur recovery. More importantly, temperature control has become a difficult problem to overcome. If the temperature is not properly controlled, on the one hand, it is easy for sulfur vapor to fail to fully condense and escape into the atmosphere, causing environmental pollution; on the other hand, too low a temperature may cause sulfur to condense prematurely in the pipeline, which in turn causes pipeline blockage and seriously affects the normal operation of the system.

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

[0006] The object of the present invention is to provide a sulfur recovery system in 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 object, the present invention provides the following technical solution: a sulfur recovery system in sulfur-containing flue gas, comprising:

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

[0009] The high-temperature condensation assembly is used to preliminarily cool the high-temperature sulfur-containing flue gas, converting the sulfur vapor in the high-temperature sulfur-containing flue gas into a liquid state;

[0010] The low-temperature condensation assembly is used to further cool the cooled flue gas, condensing the remaining sulfur vapor in the flue gas into a solid state;

[0011] A sulfur collection device, which is arranged at the bottom of the connection box and is used to separately collect liquid sulfur and solid sulfur;

[0012] An anti-blocking assembly, which is arranged inside the low-temperature condensation assembly and is used to prevent the sulfur condensed into a solid state from blocking the low-temperature condensation assembly;

[0013] A bag filter, which is connected to the exhaust port of the low-temperature condensation assembly through an exhaust gas flue;

[0014] An exhaust gas washing system, in which the exhaust gas filtered by the bag filter is introduced into the exhaust gas washing system through a draft fan to purify the remaining toxic gases in the exhaust gas, and the purified gas is discharged into the atmosphere after being detected and qualified by an 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 assembly includes a high-temperature smoke box, one end of the high-temperature smoke box is connected to a high-temperature flue, the bottom of the high-temperature smoke box is connected to a high-temperature array tube, and the bottom of the high-temperature array tube is connected to the upper end inside the connection box;

[0016] A first heat exchange tube is spirally wound around the high-temperature array tube;

[0017] The low-temperature condensation assembly includes a low-temperature smoke box, the exhaust port of the low-temperature smoke box is connected to the exhaust gas flue, the bottom of the low-temperature smoke box is connected to a low-temperature array tube, the bottom of the low-temperature array tube is connected to the upper end inside the connection box, and a second heat exchange tube is spirally wound around 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 connection box, and a low-temperature section temperature controller is installed inside the low-temperature smoke 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 connection 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 smoke 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 fixedly installed at the bottom of the connection box. There are two collection funnels, one of which is located directly below the high-temperature array tube, and the other is located directly below the low-temperature array tube;

[0021] The bottoms of both collection funnels are connected to a diversion pipe, the bottom of the diversion pipe is connected to a sulfur collection tank, and the bottom of the sulfur collection tank is connected to a discharge pipe. A second valve is installed on the discharge pipe;

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

[0023] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, the anti-blocking component includes a rotating rod rotatably installed inside the low-temperature smoke box. The inside of the rotating rod is hollow, an inlet for smoke is opened at the bottom of the rotating rod, an outlet for smoke is opened at the upper end of the rotating rod, the inlet for smoke is connected to the inside of the low-temperature array tube, a scraping blade is fixedly connected to the bottom of the rotating rod, and the scraping blade is in 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, optionally, the scraping blade is arranged in a spiral shape.

[0025] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, the anti-blocking component further includes a driving member. The driving member includes a driving motor fixedly installed on one side of the low-temperature smoke box through a motor seat. The upper end of the rotating rod rotatably penetrates through the top of the low-temperature smoke box through a sealing bearing. Synchronous wheels are fixedly connected to the upper end of the rotating rod and the upper end of the rotating shaft of the driving motor, and adjacent two synchronous wheels are connected by a synchronous belt.

[0026] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, a vibration component is arranged at the lower end of the connection box. The vibration component includes a support seat arranged in a frame shape, and a vibration motor is fixedly installed on the support seat.

[0027] In a sulfur recovery system for sulfur-containing flue gas according to the present invention, optionally, it further includes a mounting seat, and the top of the mounting seat is connected to the support seat through a rubber shock pad.

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

[0029] The system adopts a cooling and condensing device composed of a high-temperature condensing component and a low-temperature condensing component, which conducts hierarchical cooling according to the different phase change temperatures of sulfur. The high-temperature condensing component preliminarily cools the high-temperature sulfur-containing flue gas to 150 - 200 °C, enabling most of the sulfur vapor to be efficiently condensed into liquid sulfur. This temperature range not only ensures the full liquefaction of sulfur vapor but also avoids premature solidification and blockage of the pipeline. Subsequently, the low-temperature condensing component further cools the flue gas to 80 - 120 °C, causing the remaining sulfur vapor to condense into solid sulfur. This hierarchical treatment method can fully recover sulfur in the flue gas and greatly improve 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 timely and evenly scrape off the attached solid sulfur, preventing its accumulation from blocking the pipeline. The spiral scraper design can not only more efficiently peel off the solid sulfur but also reduce the resistance during rotation, avoiding the occurrence of jamming phenomena and ensuring the smooth flow of the flue gas in the system.

[0031] Applying vibration to the connection box through a vibration motor helps the liquid sulfur or solid sulfur to fall into the collection funnel more smoothly, reducing the adhesion of sulfur to the inner wall of the pipeline or equipment, reducing the risk of equipment failure caused by blockage, and at the same time improving the efficiency of sulfur collection.

[0032] By setting the first heat exchange tube and the second heat exchange tube, heat can be collected. Description of the Drawings

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

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

[0035] Figure 3 It is a front view structural 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 It is one of the partial view structural 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 It is another partial view structural 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 It is a partial sectional view structural diagram of a cooling and condensing device in a sulfur recovery system for sulfur-containing flue gas according to the present invention;

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

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

[0041] 2. Low-temperature condensation component; 201. Low-temperature smoke box; 2011. Tail gas flue; 202. Low-temperature array tube; 203. Second heat exchange tube;

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

[0043] 4. Mounting seat;

[0044] 5. Vibration component; 501. Support seat; 502. Vibration motor; 503. Rubber shock pad;

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

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

[0047] 8. Anti-blocking component; 801. Rotating rod; 8011. Smoke inlet; 8012. Smoke outlet; 802. Scraper; 803. Synchronous pulley; 804. Synchronous belt; 805. Driving motor; 806. Motor seat; 807. Sealed bearing. Detailed implementation manners

[0048] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation manners.

[0049] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation on this patent; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[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", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0051] In the description of the present invention, unless otherwise clearly specified and defined, if terms such as "connection" are used to indicate the connection relationship between components, such terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Example 1

[0053] Please refer to Figures 1 to 7 , this embodiment provides a sulfur recovery system in sulfur-containing flue gas, which is characterized in that it includes: a cooling and condensation device, the cooling and condensation device includes a high-temperature condensation component 1, a low-temperature condensation component 2, and a connection box 3. The air outlet of the high-temperature condensation component 1 is connected to the air inlet of the low-temperature condensation component 2 through the connection box 3; the high-temperature condensation component 1 is used for preliminarily cooling the high-temperature sulfur-containing flue gas to convert the sulfur vapor in the high-temperature sulfur-containing flue gas into a liquid state; the low-temperature condensation component 2 is used for further cooling the cooled flue gas to condense the remaining sulfur vapor in the flue gas into a solid state; a sulfur collection device, the sulfur collection device is arranged at the bottom of the connection box 3 and is used for separately collecting liquid sulfur and solid sulfur; an anti-blocking component 8, the anti-blocking component 8 is arranged in the low-temperature condensation component 2, and the anti-blocking component 8 is used to prevent the sulfur condensed into a solid state from blocking the low-temperature condensation component 2;

[0054] A bag filter, the bag filter is connected to the exhaust port of the low-temperature condensation component 2 through an exhaust gas flue 2011;

[0055] An exhaust gas washing system, the exhaust gas filtered by the bag filter is introduced into the exhaust gas washing system through a draft fan to purify the remaining toxic gases in the exhaust gas, and the purified gas is discharged into the atmosphere after being detected and qualified by an exhaust gas detection system.

[0056] During use, the high-temperature sulfur-containing flue gas enters the high-temperature condensation component 1 to preliminarily cool the high-temperature sulfur-containing flue gas. In a high-temperature environment, sulfur exists in the flue gas in a vapor state. When the high-temperature sulfur-containing flue gas flows in the high-temperature condensation component 1, heat is transferred to the cooling medium through heat exchange. As the temperature decreases, when reaching the dew point temperature of the sulfur vapor, the sulfur vapor begins to undergo a phase change and changes from a gaseous state to a liquid state.

[0057] The flue gas preliminarily cooled by the high-temperature condensation component 1 enters the connection box 3, carrying liquid sulfur and gaseous remaining components. The connection box 3 plays a role of transition and buffering. It provides a short residence space for the liquid sulfur, enabling it to separate from the flue gas under the action of gravity and precipitate downward. At the same time, it also provides a relatively stable flow environment for the flue gas entering the low-temperature condensation component 2.

[0058] The flue gas coming out of the connection box 3 enters the low-temperature condensation component 2 for further cooling of the flue gas. Since part of the sulfur vapor has condensed into liquid sulfur in the high-temperature condensation component 1, the content of the remaining sulfur vapor in the flue gas entering the low-temperature condensation component 2 is relatively low at this time. However, as the temperature further decreases, when reaching the freezing point of sulfur, the remaining sulfur vapor will directly change from gaseous state to solid state. This is because in the low-temperature environment, the molecular motion of sulfur slows down, and the intermolecular force increases, enabling sulfur atoms to arrange into a solid crystal structure.

[0059] The sulfur collection device is arranged at the bottom of the connection box 3, and its purpose is to separately collect liquid sulfur and solid sulfur. Due to its own gravity, the liquid sulfur will flow from the bottom of the connection box 3 into the part of the sulfur collection device dedicated to collecting liquid sulfur. The solid sulfur will form inside the low-temperature condensation component 2 and may adhere to positions such as the inner wall of the pipeline as the flue gas flows. Under the action of the gravity anti-blocking component 8, it will also fall to the bottom of the connection box 3 and enter the corresponding area of the sulfur collection device for collecting solid sulfur. Through this method of separate collection, it is convenient to further process and utilize sulfur in different states later.

[0060] The tail gas processed by the low-temperature condensation component 2 enters the bag filter through the tail gas flue 2011. The bag filter uses the filtering effect of the cloth bag to intercept the solid particles carried in the tail gas.

[0061] The tail gas filtered by the bag filter is introduced into the tail gas washing system under the action of the induced draft fan. In addition to sulfur components, the tail gas may also contain other toxic gases (such as sulfur dioxide, hydrogen sulfide, etc.). The tail gas washing system makes the tail gas fully contact with a specific washing liquid (such as an alkaline solution, etc.) and uses chemical reactions to absorb and convert the toxic gases in the tail gas. For example, sulfur dioxide can react with hydroxide ions in the alkaline solution to form sulfite, thereby reducing the content of toxic gases in the tail gas.

[0062] The gas purified by the tail gas washing system enters the tail gas detection system. The tail gas detection system will detect various indicators of the purified gas, such as the concentration of toxic gases and the content of particulate matter. Only when the detection results meet the relevant national environmental protection standards will the purified gas be discharged into the atmosphere, thus ensuring that the entire sulfur recovery system will not cause pollution to the environment during operation.

[0063] In this embodiment, the high-temperature condensation assembly 1 includes a high-temperature smoke box 101. One end of the high-temperature smoke box 101 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 end inside the connection box 3. A first heat exchange tube 103 is spirally wound around 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 an exhaust gas 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 end inside the connection box 3. A second heat exchange tube 203 is spirally wound around the low-temperature array tube 202.

[0064] The high-temperature sulfur-containing flue gas enters the high-temperature smoke box 101 from 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 flue gas in the high-temperature array tube 102, causing the sulfur vapor to condense into liquid sulfur and flow into the connection box 3. The cooled flue gas enters the low-temperature array tube 202 from the connection box 3, and 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 connection 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 is used to monitor the temperature inside the connection box 3, control the temperature and flow rate of the cooling medium in the first heat exchange tube 103, ensure that the flue gas in the high-temperature array tube 102 is cooled to an appropriate temperature, and enable the sulfur vapor to condense smoothly into liquid. 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 at which the remaining sulfur vapor can condense into solid.

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

[0068] Controlling the temperature of the tail gas after being cooled by the high-temperature array tube 102 within the range of 150°C - 200°C can ensure that the sulfur vapor is fully condensed into liquid, and at the same time avoid the direct solidification of some sulfur vapor due to too low temperature, which may cause pipeline blockage. Controlling the temperature of the tail gas after being cooled by the low-temperature array tube 202 within the range of 80°C - 120°C can cause the remaining sulfur vapor to condense into solid, and this temperature is conducive to the subsequent treatment of the tail gas, preventing too low temperature from affecting the equipment performance or causing other problems.

[0069] For example, when the flue gas flow rate is 25000m3 / h, the sulfur vapor concentration is between 15% and 35%. During system operation, the initial temperature of the cooling water in the high-temperature section is set to 60°C and is adjusted in real time by the high-temperature section temperature controller 6 according to the flue gas temperature and sulfur vapor concentration to ensure that the tail gas temperature at the outlet of the high-temperature array tube 102 is stable at about 180°C, causing 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°C and is precisely controlled by the low-temperature section temperature controller 7 to ensure that the tail gas temperature at the outlet of the low-temperature array tube 202 is maintained at about 100°C, allowing the remaining sulfur vapor to fully solidify. After detection, the sulfur recovery rate reaches 92% and the purity is 90%.

[0070] For example, when the flow rate of sulfur-containing flue gas is 35000 m 3 / h and the sulfur vapor concentration is 25% - 35%. The temperature of the cooling water in the high-temperature section is maintained at 55°C - 65°C, accelerating the cooling rate of the flue gas in the high-temperature array tube 102, and more sulfur vapor condenses into liquid sulfur in the high-temperature section. The temperature of the refrigerant in the low-temperature section is maintained at 30°C - 35°C, enhancing the condensation effect of the low-temperature condensation component 2 and promoting the more complete solidification of the remaining sulfur vapor into solid sulfur. After adjustment, the sulfur recovery rate is increased to 95% and the purity ≥ 93%.

[0071] In this embodiment, the sulfur collection device includes a collection funnel 301. The collection funnel 301 is fixedly installed at the bottom of the connection box 3. There are two collection funnels 301. One of the collection funnels 301 is located below the high-temperature array tube 102, and the other collection funnel 301 is directly below the low-temperature array tube 202; the bottoms of both collection funnels 301 are connected to a diversion pipe 302, the bottom of the diversion pipe 302 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 diversion pipe 302.

[0072] The liquid sulfur condensed from the high-temperature array tube 102 and the solid sulfur at the low-temperature smoke box 201 respectively fall into the corresponding collection funnels 301 and enter the sulfur collection tank 303 through the diversion pipe 302. When it is necessary to discharge sulfur, close the first valve 304, then open the second valve 306, and discharge 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. The rotating rod 801 is rotatably installed inside the low-temperature smoke box 201. The inside of the rotating rod 801 is hollow. The bottom of the rotating rod 801 is provided with a smoke inlet 8011, the upper end of the rotating rod 801 is provided with a smoke outlet 8012, the smoke inlet 8011 is connected to the inside of the low-temperature array tube 202, and the bottom of the rotating rod 801 is fixedly connected to a scraper 802. The scraper 802 is in sliding contact with the inner wall of the low-temperature array tube 202.

[0074] The rotating rod 801 rotates in the low-temperature smoke box 201, and the smoke in the low-temperature array tube 202 enters the rotating rod 801 from the smoke inlet 8011 and is discharged from the smoke outlet 8012. The scraper 802 at the bottom of the rotating rod 801 rotates with the rotating rod 801 to scrape off the solid sulfur condensed on the inner wall of the low-temperature array tube 202 to prevent the solid sulfur from accumulating and clogging the pipeline.

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

[0076] When the spiral scraper 802 rotates, it can contact the inner wall of the low-temperature array tube 202 more comprehensively. Compared with ordinary scrapers, it has a better effect of scraping off solid sulfur and can more effectively prevent solid sulfur from locally accumulating on the inner wall of the pipeline, ensuring the smooth flow of the pipeline. It can also squeeze the scraped solid sulfur downward to allow it to smoothly enter the connection box 3.

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

[0078] After the driving motor 805 is started, its rotating shaft drives the synchronous wheel 803 to rotate, and through the transmission of the synchronous belt 804, the synchronous wheel 803 on the upper end of the rotating rod 801 rotates, and then drives the rotating rod 801 to rotate, so that the scraper 802 can scrape the solid sulfur on the inner wall of the low-temperature array tube 202. The sealing bearing 807 ensures the sealing of the rotating rod 801 when rotating to prevent smoke leakage.

[0079] In this embodiment, a vibration assembly 5 is disposed at the lower end of the connection box 3 . The vibration assembly 5 includes a support base 501 . The support base 501 is arranged in a frame shape, and a vibration motor 502 is fixedly mounted on the support base 501 .

[0080] After the vibration motor 502 is started, vibration is generated and transmitted to the connection box 3 through the support base 501. The vibration can make the liquid sulfur and solid sulfur in the connection box 3 flow more smoothly to the collecting funnel 301, avoid sulfur accumulation in the connection box 3, and also help to remove sulfur that may be attached to the inner wall of the connection box 3.

[0081] In this embodiment, a mounting base 4 is also included, and the top of the mounting base 4 is connected to the support base 501 through a rubber shock-absorbing pad 503. The rubber shock-absorbing pad 503 can reduce the vibration generated by the vibration component 5 from being transmitted to the mounting base 4 and other devices, avoiding the impact of excessive vibration on surrounding devices, and ensuring the stability of the operation of the entire system.

[0082] Working principle:

[0083] 1. The high-temperature sulfur-containing flue gas enters the high-temperature smoke 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 it down, condensing the sulfur vapor into liquid sulfur. The liquid sulfur falls into the corresponding collection funnel 301 at the bottom of the connection box 3 through the high-temperature array tube 102, and then enters the sulfur collection tank 303 through the diversion pipe 302. The temperature of the tail gas after cooling remains at 150°C - 200°C and enters the connection box 3.

[0084] 2. The tail gas in the connection box 3 enters the low-temperature array tube 202, and the cooling medium in the second heat exchange tube 203 further cools the tail gas, condensing the remaining sulfur vapor into solid sulfur. The driving motor 805 of the anti-blocking assembly 8 drives the rotating rod 801 and the scraper 802 to rotate, scraping the solid sulfur on the inner wall of the low-temperature array tube 202, so that it falls into another collection funnel 301 at the bottom of the connection box 3, and then enters the sulfur collection tank 303 through the diversion pipe 302. The temperature of the tail gas after cooling remains at 80°C - 120°C and enters the low-temperature smoke box 201.

[0085] 3. The tail gas in the low-temperature smoke box 201 enters the bag filter through the tail gas flue 2011 to remove dust. Then the tail gas enters the tail gas washing system through the induced draft fan to purify the toxic gas therein. The purified gas is discharged into the atmosphere after being detected and qualified by the tail gas detection system.

[0086] 4. When it is necessary to discharge sulfur, close the first valve 304, and then open the second valve 306 to discharge the sulfur in the sulfur collection tank 303.

[0087] Parts not involved in the present invention are the same as or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sulfur recovery system in a sulfur-containing flue gas, characterized in that, Comprising: A cooling and condensing device, which includes a high-temperature condensing component (1), a low-temperature condensing component (2), and a connection box (3). The gas outlet of the high-temperature condensing component (1) is connected to the gas inlet of the low-temperature condensing component (2) through the connection box (3); The high-temperature condensing component (1) is used for preliminarily cooling the high-temperature sulfur-containing flue gas, converting the sulfur vapor in the high-temperature sulfur-containing flue gas into a liquid state; The low-temperature condensing component (2) is used for further cooling the cooled flue gas, condensing the remaining sulfur vapor in the flue gas into a solid state; A sulfur collection device, which is arranged at the bottom of the connection box (3) and is used for separately collecting liquid sulfur and solid sulfur; An anti-blocking component (8), which is arranged in the low-temperature condensing component (2) and is used for preventing the sulfur condensed into a solid state from blocking the low-temperature condensing component (2); A bag filter, which is connected to the smoke exhaust port of the low-temperature condensing component (2) through a tail gas flue (2011); A tail gas washing system. The tail gas filtered by the bag filter is introduced into the tail gas washing system through a draft fan to purify the remaining toxic gases in the tail gas. The purified gas is discharged into the atmosphere after being detected and qualified by a tail gas detection system.

2. The sulfur recovery system in sulfur-containing flue gas according to claim 1, characterized in that: The high-temperature condensing component (1) includes a high-temperature smoke box (101). One end of the high-temperature smoke box (101) is connected to a high-temperature flue (1011). 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 end inside the connection box (3); A first heat exchange tube (103) is spirally wound around the high-temperature array tube (102); The low-temperature condensing component (2) includes a low-temperature smoke box (201). The smoke exhaust port of the low-temperature smoke box (201) is connected to the tail gas 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 end inside the connection box (3). A second heat exchange tube (203) is spirally wound around the low-temperature array tube (202).

3. The sulfur recovery system in sulfur-containing flue gas according to claim 2, wherein: A high-temperature section temperature controller (6) is installed inside the connection box (3), and a low-temperature section temperature controller (7) is installed inside the low-temperature smoke box (201).

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

5. A sulfur recovery system in sulfur-containing flue gas according to claim 2, characterized in that: The sulfur collection device includes a collection funnel (301). The collection funnel (301) is fixedly installed at the bottom of the connection box (3). There are two collection funnels (301). One of the collection funnels (301) is located directly below the high-temperature array tube (102), and the other collection funnel (301) is located directly below the low-temperature array tube (202). The bottoms of the two collection funnels (301) are both communicated with a diversion pipe (302). The bottom of the diversion pipe (302) is communicated with a sulfur collection tank (303). The bottom of the sulfur collection tank (303) is communicated with a discharge pipe (305). A second valve (306) is installed on the discharge pipe (305). A first valve (304) is installed on the diversion pipe (302).

6. The sulfur recovery system in a sulfur-containing flue gas according to claim 2, characterized in that: The anti-blocking component (8) includes a rotating rod (801). The rotating rod (801) is rotatably installed inside the low-temperature smoke box (201). The inside of the rotating rod (801) is hollow. An inlet port (8011) is opened at the bottom of the rotating rod (801), and an outlet port (8012) is opened at the upper end of the rotating rod (801). The inlet port (8011) is communicated with the inside of the low-temperature array tube (202). A scraping blade (802) is fixedly connected to the bottom of the rotating rod (801). The scraping blade (802) is in sliding contact with the inner wall of the low-temperature array tube (202).

7. A sulfur recovery system in a sulfur-containing flue gas according to claim 6, characterized in that: The scraping blade (802) is arranged in a spiral shape.

8. The sulfur recovery system in sulfur-containing flue gas according to claim 6, wherein: The anti-blocking component (8) further includes a driving member. The driving member includes a driving motor (805). The driving motor (805) is fixedly installed on one side of the low-temperature smoke box (201) through a motor base (806). The upper end of the rotating rod (801) rotatably penetrates through the top of the low-temperature smoke box (201) through a sealing bearing (807). Synchronous wheels (803) are fixedly connected to the upper end of the rotating rod (801) and the upper end of the rotating shaft of the driving motor (805). Adjacent two synchronous wheels (803) are connected by a synchronous belt (804).

9. A sulfur recovery system in a sulfur-containing flue gas according to claim 1, characterized in that: A vibration component (5) is arranged at the lower end of the connection box (3). The vibration component (5) includes a support seat (501). The support seat (501) is arranged in a frame shape. A vibration motor (502) is fixedly installed on the support seat (501).

10. A sulfur recovery system in a sulfur-containing flue gas according to claim 9, characterized in that: It further includes a mounting seat (4). The top of the mounting seat (4) is connected to the support seat (501) through a rubber shock pad (503).

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