Sulfur refining treatment system

Abstract

This application provides a sulfur refining system, comprising a crusher, a conveyor belt, a sulfur melting kettle, a metering kettle, a sublimation kettle, a condenser, a finished product kettle, a slicer, and a finished sulfur storage silo, connected in series. The sulfur refining system of this application melts crude sulfur in the sulfur melting kettle to form liquid sulfur. The liquid sulfur is then fed into the sublimation kettle, where it is heated and sublimated into sulfur vapor, separating the sulfur from impurities in the crude sulfur. The sulfur vapor is then condensed into liquid in the condenser, further cooled in the finished product kettle, and then fed into the slicer to cool into a solid state. The slices are then collected in the finished sulfur storage silo. This system, using the aforementioned equipment, refines crude sulfur through sublimation, overcoming the drawbacks of traditional sulfur refining methods that result in limited purity improvement and low sulfur recovery rates when purifying by-product sulfur through sulfur melting.

Description

Technical Field

[0001] This application relates to the field of sulfur refining technology, and more particularly to a sulfur refining system. Background Technology

[0002] In chemical production processes, units such as Claus furnaces for hydrogen sulfide recovery produce byproduct sulfur. As a byproduct of many chemical reactions, the production of byproduct sulfur is increasing daily. However, unrefined byproduct sulfur often contains significant amounts of impurities, including organic matter, inorganic salts, and moisture. The presence of these impurities severely affects the purity and quality of the sulfur, thus limiting its application in high-end chemicals, pharmaceuticals, and pesticides. Therefore, refining byproduct sulfur to improve its purity is of paramount importance.

[0003] The existing methods for refining sulfur mostly involve melting by-product sulfur, filtering it to remove solid impurities, and obtaining refined sulfur. However, this method has limited effect on improving the purity of sulfur, as it can only remove insoluble impurities. Moreover, some liquid sulfur adheres to solid impurities during filtration, resulting in a lower sulfur recovery rate. Utility Model Content

[0004] This application provides a sulfur refining system to solve the problems of limited purity improvement and low sulfur recovery rate in the existing method of purifying by-product sulfur by melting sulfur.

[0005] This application provides a sulfur refining system, comprising a crusher, a conveyor belt, a sulfur melting kettle, a metering kettle, a sublimation kettle, a condenser, a finished product kettle, a slicer, and a finished sulfur storage silo connected in series.

[0006] Optionally, a vibrating screen is installed between the crusher and the conveyor belt; The fine material output end of the vibrating screen is connected to the conveyor belt, and the coarse material output end is connected to the crusher.

[0007] Optionally, the conveyor belt is also connected to the caustic soda flake feed trough.

[0008] Optionally, the sulfur melting vessel includes an integrally enclosed vessel body; A liquid sulfur outlet is provided on the upper part of one side of the vessel body, and a feeder is provided on the top of the vessel body away from the liquid sulfur outlet. The top of the vessel is connected to the waste gas treatment device via a gas outlet; The vessel is equipped with a stirrer inside and a heat exchange jacket outside.

[0009] Optionally, the gas inlet of the condenser is connected to the sublimation kettle, and the gas outlet is connected to the waste gas treatment device. The heat exchange medium inlet of the condenser is connected to the hot water supply network, and the heat exchange medium outlet is connected to the steam-water separator and the steam network in sequence.

[0010] Optionally, the vibrating screen includes a vibrating screen body, with a fine material output end at the bottom and a coarse material output end on one side. The upper part of the vibrating screen body is covered with a dust cover. The top of the dust cover is located away from the coarse material output end of the vibrating screen body and the center of the dust cover is located with a suction port. The suction port is connected to the cyclone dust collector and the exhaust fan in sequence. The cyclone dust collector is also connected to the sulfur melting kettle.

[0011] Optionally, the sublimation reactor is also connected to the cold slag reactor.

[0012] This application provides a sulfur refining system. A sulfur melting kettle is used to melt crude sulfur into liquid sulfur. The liquid sulfur is then fed into a sublimation kettle to be heated and sublimated into sulfur vapor, separating the sulfur from impurities in the crude sulfur. The sulfur vapor is then condensed into liquid in a condenser, further cooled in a finished product kettle, and then fed into a slicer to be cooled into a solid and sliced ​​and collected in a finished sulfur storage silo. This system, using the aforementioned equipment, refines crude sulfur through sublimation, overcoming the drawbacks of traditional sulfur refining methods that result in limited purity improvement and low sulfur recovery rates when purifying by-product sulfur through sulfur melting. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of a sulfur refining system provided in an embodiment of this application; Figure 2 A schematic diagram of a sulfur refining system provided in another embodiment of this application; Figure 3 This is a schematic diagram of the structure of a sulfur melting kettle provided in one embodiment of this application; Figure 4 A schematic diagram of a sulfur refining system provided in yet another embodiment of this application; Figure 5 This is a schematic diagram of the structure of a vibrating screen provided in an embodiment of this application.

[0015] Explanation of reference numerals in the attached figures: 1. Crusher; 2. Conveyor belt; 3. Sulfur melting kettle; 4. Metering kettle; 5. Sublimation kettle; 6. Condenser; 7. Finished product kettle; 8. Slicer; 9. Finished sulfur storage silo; 10. Vibrating screen; 11. Cyclone dust collector; 12. Exhaust fan; 21. Caustic soda flake feeding tank; 31. Kettle body; 32. Feeder; 33. Waste gas treatment device; 34. Agitator; 35. Heat exchange jacket; 51. Cold slag kettle; 61. Hot water supply network; 62. Steam-water separator; 63. Steam network; 101. Vibrating screen body; 301. Liquid sulfur outlet; 302. Gas outlet; 1001. Feed inlet; 1002. Suction port; 1011. Dust cover. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0017] This application is attached Figures 1-5 A schematic diagram of the sulfur refining system and its related equipment is shown, including: like Figure 1 As shown, this application provides a sulfur refining system, including a crusher 1, a conveyor belt 2, a sulfur melting kettle 3, a metering kettle 4, a sublimation kettle 5, a condenser 6, a finished product kettle 7, a slicer 8, and a finished sulfur storage silo 9 connected in series.

[0018] Crude sulfur (i.e., by-product sulfur) is first fed into crusher 1, which mechanically breaks the crude sulfur into smaller particles. The crushed sulfur particles are then transported via conveyor belt 2 to the inlet of the sulfur melting kettle 3. In the sulfur melting kettle 3, the sulfur particles are heated and melted into liquid sulfur (the sulfur in the kettle is heated to 150°C). The molten liquid sulfur flows out from the outlet of the kettle 3 and enters metering kettle 4 (metering kettle 4 is used to accurately measure and control the flow rate or volume of liquid sulfur, ensuring a stable amount of material entering subsequent processes and avoiding fluctuations that could affect the refining effect). The metered liquid sulfur is then introduced into sublimation kettle 5. In sublimation kettle 5, the liquid sulfur is further heated to 440°C for sublimation, transforming from a liquid state into gaseous sulfur. The sulfur gas produced by sublimation is discharged from the top of the sublimation reactor 5 and then enters the condenser 6. The condenser 6 lowers the temperature of the sulfur vapor through a heat exchange medium, causing the sulfur to gradually condense into a liquid (sulfur vapor can be liquefied to obtain liquid sulfur when cooled at a temperature not lower than its melting point). The sulfur is then collected in the finished product reactor 7 and cooled to 130~160℃. The finished product reactor 7 serves as a temporary storage container for accumulating refined sulfur and ensuring that it reaches a certain quantity before proceeding to the next process. The solid sulfur output from the finished product reactor 7 is conveyed to the slicer 8 for further cooling into solid sulfur and slicing. The sliced ​​solid sulfur is then transferred to the finished product sulfur storage silo 9 for storage.

[0019] This application provides a sulfur refining system. A sulfur melting kettle 3 is used to melt crude sulfur into liquid sulfur. The liquid sulfur is then fed into a sublimation kettle 5, where it is heated and sublimated into sulfur vapor, separating the sulfur from impurities in the crude sulfur. The sulfur vapor is then condensed into liquid in a condenser 6, further cooled in a finished product kettle 7, and then fed into a slicer 8 to cool into a solid state. The slices are then collected in a finished sulfur storage silo 9. This system, using the aforementioned equipment, refines crude sulfur through sublimation, overcoming the drawbacks of traditional sulfur refining methods that result in limited purity improvement and low sulfur recovery rates when purifying by-product sulfur through sulfur melting.

[0020] like Figure 2 As shown, optionally, a vibrating screen 10 is provided between the crusher 1 and the conveyor belt 2; The fine material output end of the vibrating screen 10 is connected to the conveyor belt 2, and the coarse material output end is connected to the crusher 1.

[0021] The crude sulfur raw material is first fed into crusher 1 for preliminary crushing. The crushed sulfur particles are discharged from the outlet of crusher 1 and enter vibrating screen 10. Vibrating screen 10 is driven by a vibrating motor to move the screen mesh, causing the particles to move on the screen surface and achieve screening. Depending on the mesh aperture, smaller particles pass through the screen and fall, becoming fine material, while larger particles are retained on the screen and become coarse material. The fine material is discharged from the fine material output end at the bottom of vibrating screen 10 and falls directly onto conveyor belt 2, which transports it to the sulfur melting kettle 3. The coarse material is discharged from the coarse material output end on the side of vibrating screen 10 and returns to the feed inlet of crusher 1 by a conveying device or gravity for further crushing. This cycle continues until all sulfur particles reach the required fineness standard. The screening efficiency of vibrating screen 10 depends on the screen size and vibration parameters, and is usually adjusted according to process requirements to ensure that the fine material size is suitable for subsequent melting steps. After fine material enters conveyor belt 2, it is transported to the sulfur melting kettle 3 at a constant speed. Weighing or monitoring devices can be installed during the conveying process to control the feed rate. Coarse material returns to crusher 1, where the crusher 1 adjusts the crushing intensity according to the material characteristics to achieve efficient re-crushing. The entire process optimizes the material flow through the grading effect of vibrating screen 10, reduces load fluctuations in crusher 1, and ensures that the sulfur particles entering the sulfur melting kettle 3 are of uniform size, thereby improving melting efficiency.

[0022] like Figure 2 As shown, optionally, the conveyor belt 2 is also connected to the caustic soda flake feeding tank 21.

[0023] After the crude sulfur raw material is crushed by crusher 1, the crushed sulfur particles are conveyed by conveyor belt 2. During the conveying process of conveyor belt 2, caustic soda flakes feed trough 21 is connected to conveyor belt 2, and caustic soda flakes are released from feed trough 21 at a controllable rate and evenly spread on the surface of sulfur particles on conveyor belt 2. Caustic soda flakes feed trough 21 is equipped with a metering device, such as a screw feeder or vibrating feeder, to ensure accurate addition and adjust according to the impurity content of the raw material. The material mixed with caustic soda flakes continues to enter the sulfur melting kettle 3 with conveyor belt 2. In sulfur melting kettle 3, the heating process melts the sulfur, and at the same time, the caustic soda flakes react with the acidic impurities in the sulfur to form salts or other compounds, thereby reducing the acidity of the liquid sulfur and reducing the corrosion of the sulfur melting kettle 3 and related pipelines and equipment for conveying liquid sulfur.

[0024] like Figure 3 As shown, optionally, the sulfur melting kettle 3 includes an integrally enclosed kettle body 31; A liquid sulfur outlet 301 is provided on the upper part of one side of the vessel body 31, and a feeder 32 is provided on the top of the vessel body 31 away from the liquid sulfur outlet 301. The top of the vessel body 31 is connected to the waste gas treatment device 33 via the gas outlet 302; A stirrer 34 is also installed inside the vessel body 31; a heat exchange jacket 35 is installed outside the vessel body 31.

[0025] Coarse sulfur particles are conveyed to the sulfur melting kettle 3 via conveyor belt 2 and enter the kettle body 31 through the top feeder 32. The feeder 32 is typically a feed valve or funnel structure (such as a flap feeder) to control the material inflow rate and avoid pressure fluctuations inside the kettle. After entering the kettle body 31, the sulfur particles gradually melt under the heating action of the heat exchange jacket 35. The heat exchange jacket 35 surrounds the outside of the kettle body 31 and provides heat through a circulating heat medium (steam in this application) to raise the temperature inside the kettle to 150°C. The agitator 34 rotates inside the kettle body 31, and the agitator blades stir the sulfur material to promote uniform heat distribution, prevent local overheating or agglomeration, and accelerate the separation of impurities. During the melting process, volatile impurities or decomposition gases in the sulfur are released from the liquid sulfur. These gases are discharged through the gas outlet 302 at the top of the kettle body 31 and enter the waste gas treatment device 33 for treatment to reduce environmental pollution. The waste gas treatment device 33, such as a series of scrubbing towers and activated carbon adsorption towers, is used to remove harmful components. As melting proceeds, liquid sulfur accumulates in the vessel 31, and the liquid level gradually rises. When the liquid sulfur reaches a certain height, it flows out from the liquid sulfur outlet 301 on the side of the vessel 31 and enters the subsequent metering vessel 4. The liquid sulfur outlet 301 is located at the top to ensure that the flowing liquid sulfur is the purer upper layer, while the sedimentary impurities remain at the bottom of the vessel and are cleaned periodically. The continuous operation of the agitator 34 also helps to maintain the fluidity of the liquid sulfur and prevents blockage of the outlet.

[0026] like Figure 2 As shown, optionally, the gas inlet of the condenser 6 is connected to the sublimation kettle 5, and the gas outlet is connected to the waste gas treatment device 33. The heat exchange medium input end of the condenser 6 is connected to the hot water supply network 61, and the heat exchange medium output end is connected to the steam-water separator 62 and the steam network 63 in sequence.

[0027] Sulfur gas generated from the sublimation reactor 5 enters the gas inlet of the condenser 6 through a pipe. The condenser 6 is a tubular heat exchanger where sulfur vapor and the heat exchange medium (hot water at approximately 95-100°C in this application) supplied by the hot water supply network 61 exchange heat countercurrently. Hot water flows into the condenser 6 from the heat exchange medium inlet and exchanges heat with the sulfur gas. Due to the countercurrent heat exchange, the liquid sulfur near the liquid sulfur outlet of the condenser 6 (its temperature is still relatively high, approximately 180-200°C) can heat and vaporize the input heat exchange medium, i.e., the hot water, to form steam. As the heat exchange medium moves forward, its temperature gradually increases, eventually forming high-temperature, high-pressure steam when it exits from the heat exchange medium outlet of the condenser 6. This high-temperature, high-pressure steam is then fed into the steam-water separator 62 to separate the water (increasing the dryness of the steam) before being incorporated into the steam network 63 for use in factory heating. Because the sulfur vapor's cooling temperature remains above its melting point and remains liquid during the above heat exchange process, it effectively prevents the sulfur vapor from sublimating into a solid and clogging the pipes. The condensed liquid sulfur enters the finished product reactor 7, while the uncondensed gas (containing volatile impurities) is discharged from the gas output end of the condenser 6 and enters the waste gas treatment device 33 for treatment.

[0028] like Figure 4 and Figure 5 As shown, optionally, the vibrating screen 10 includes a vibrating screen body 101, with a fine material output end at the bottom and a coarse material output end on one side. A dust cover 1011 is provided on the upper part of the vibrating screen body 101. An inlet 1001 is provided at the top of the dust cover 1011 away from the coarse material output end of the vibrating screen body 101. A suction port 1002 is provided in the center of the dust cover 1011. The suction port 1002 is connected to the cyclone dust collector 11 and the exhaust fan 12 in sequence. The cyclone dust collector 11 is also connected to the sulfur melting kettle 3.

[0029] After being discharged from the crusher 1, coarse sulfur particles enter the dust cover 1011 of the vibrating screen 10 through the feed inlet 1001 and fall onto the screen mesh of the vibrating screen body 101. The vibrating screen body 101 is driven by a vibrating motor, causing the screen mesh to vibrate at high frequency, and the particles move and are screened on the screen surface. Fine material (smaller particles) falls through the screen mesh and is discharged from the fine material output end at the bottom of the vibrating screen body 101, directly entering the conveyor belt 2. Coarse material (larger particles) is intercepted by the screen mesh and is discharged from the coarse material output end on the side of the vibrating screen body 101, and is returned to the crusher 1 for further crushing via a conveying device. During the screening process, the dust generated is raised due to vibration and material collision, but it is contained within the dust cover 1011 to prevent it from escaping into the environment. The suction port 1002 at the top of the dust cover 1011 is connected to an exhaust pipe, and the operation of the exhaust fan 12 generates negative pressure, drawing the dust-laden air out of the dust cover 1011. The dust-laden air first enters the cyclone dust collector 11. The cyclone dust collector 11 uses centrifugal force to separate dust (air enters the cyclone tangentially, and dust particles collide with the cylinder wall due to inertia and fall during rotation, collecting at the bottom of the dust collector; the purified air is discharged from the top). The separated dust is mainly fine sulfur particles, which are discharged from the bottom of the cyclone dust collector 11 and transported through pipeline to the sulfur melting kettle 3 for recycling.

[0030] like Figure 2 As shown, optionally, the sublimation vessel 5 is also connected to the cold slag vessel 51.

[0031] In the sublimation reactor 5, liquid sulfur is converted into gaseous sulfur under sublimation conditions. However, impurities in the gas are difficult to sublimate at the operating temperature and become residue, accumulating at the bottom of the reactor. These residues need to be discharged periodically to maintain the normal operation of the sublimation reactor 5. The sublimation reactor 5 is connected to the slag cooling reactor 51 via pipes or valves. The residue is discharged from the bottom of the sublimation reactor 5 and enters the slag cooling reactor 51 for cooling. The cooled residue is then collected and processed in the corresponding solid waste treatment section.

[0032] A sulfur refining system, the working process of which is as follows: Crude sulfur (i.e., by-product sulfur) is first fed into crusher 1, where it is mechanically crushed into smaller particles. After being discharged from crusher 1, the crude sulfur particles enter the dust cover 1011 of vibrating screen 10 through feed inlet 1001, falling onto the screen mesh of vibrating screen body 101 for screening. Fine material (smaller particles) falls through the screen mesh and exits from the fine material output end at the bottom of vibrating screen body 101, directly entering conveyor belt 2. Coarse material (larger particles) is trapped by the screen mesh and exits from the coarse material output end on the side of vibrating screen body 101, returning to crusher 1 for further crushing via a conveying device. During the screening process, dust generated is stirred up by vibration and material collision, but is contained within the dust cover 1011 to prevent it from escaping into the environment. The suction port 1002 at the top of dust cover 1011 is connected to an exhaust duct; the exhaust fan 12 generates negative pressure, drawing dust-laden air out of dust cover 1011. Dust-laden air first enters the cyclone dust collector 11. The cyclone dust collector 11 uses centrifugal force to separate dust (air enters the cyclone tangentially, and dust particles impact the cylinder wall due to inertia and fall during rotation, collecting at the bottom of the dust collector; the purified air is discharged from the top). The separated dust is mainly fine sulfur particles, which are discharged from the bottom of the cyclone dust collector 11 and transported through pipelines to the sulfur melting kettle 3 for recycling.

[0033] Coarse sulfur particles are conveyed to the sulfur melting kettle 3 via conveyor belt 2 and enter the kettle body 31 through the top feeder 32. The feeder 32 is typically a feed valve or funnel structure (such as a flap feeder) to control the material inflow rate and avoid pressure fluctuations inside the kettle. After entering the kettle body 31, the sulfur particles gradually melt under the heating action of the heat exchange jacket 35. The heat exchange jacket 35 surrounds the outside of the kettle body 31 and provides heat through a circulating heat medium (steam in this application) to raise the temperature inside the kettle to 150°C. The agitator 34 rotates inside the kettle body 31, and the agitator blades stir the sulfur material to promote uniform heat distribution, prevent local overheating or agglomeration, and accelerate the separation of impurities. During the melting process, volatile impurities or decomposition gases in the sulfur are released from the liquid sulfur. These gases are discharged through the gas outlet 302 at the top of the kettle body 31 and enter the waste gas treatment device 33 for treatment to reduce environmental pollution. The waste gas treatment device 33, for example, is a series of scrubbing towers and activated carbon adsorption towers, used to remove harmful components. As melting proceeds, liquid sulfur accumulates in the vessel 31, and the liquid level gradually rises. When the liquid sulfur reaches a certain height, it flows out from the liquid sulfur outlet 301 on the side of the vessel 31 and enters the subsequent metering vessel 4.

[0034] The crushed sulfur particles are then transported via conveyor belt 2 to the inlet of the sulfur melting kettle 3. In the sulfur melting kettle 3, the sulfur particles are heated and melted into liquid, i.e., liquid sulfur (the sulfur in the sulfur melting kettle 3 is heated to 150°C). The molten liquid sulfur flows out from the outlet of the sulfur melting kettle 3 and enters the metering kettle 4 (the metering kettle 4 is used to accurately measure and control the flow rate or volume of liquid sulfur, ensuring a stable amount of material entering subsequent processes and avoiding fluctuations that could affect the refining effect). The metered liquid sulfur is then introduced into the sublimation kettle 5. In the sublimation kettle 5, the liquid sulfur is further heated to 440°C for sublimation, transforming from a liquid state into gaseous sulfur. The sulfur gas generated from the sublimation kettle 5 enters the gas inlet of the condenser 6 through a pipe. The condenser 6 is a tubular heat exchanger where sulfur vapor exchanges heat countercurrently with the heat exchange medium (hot water at approximately 95~100°C in this application) supplied by the self-heating water supply network 61. Hot water flows into the condenser 6 from the heat exchange medium inlet, exchanging heat with the sulfur gas. Because the two exchange heat in countercurrent flow, the liquid sulfur near the liquid sulfur output end of condenser 6 (its temperature is still relatively high, about 180~200℃) can heat the input heat exchange medium, i.e., hot water, and vaporize it into steam. As the heat exchange medium moves forward, its temperature gradually increases, and finally, when it is output from the heat exchange medium output end of condenser 6, it has formed high-temperature and high-pressure steam. After the water in the steam-water separator 62 is separated (to increase the dryness of the steam), it is connected to the steam pipeline network 63 for use in factory heating.

[0035] In the sublimation reactor 5, liquid sulfur is converted into gaseous sulfur under sublimation conditions. However, impurities in the gas are difficult to sublimate at the operating temperature and become residue, accumulating at the bottom of the reactor. These residues need to be discharged periodically to maintain the normal operation of the sublimation reactor 5. The sublimation reactor 5 is connected to the slag cooling reactor 51 via pipes or valves. The residue is discharged from the bottom of the sublimation reactor 5 and enters the slag cooling reactor 51 for cooling. The cooled residue is then collected and processed in the corresponding solid waste treatment section.

[0036] The condensed liquid sulfur enters the finished product reactor 7 and is cooled to 130-160°C. The finished product reactor 7 serves as a temporary storage container to accumulate refined sulfur and ensure that it reaches a certain quantity before proceeding to the next process. The solid sulfur output from the finished product reactor 7 is conveyed to the slicer 8 for further cooling into solid sulfur and then sliced. The sliced ​​solid sulfur is then transferred to the finished product sulfur storage silo 9 for storage.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sulfur refining system, characterized in that, It includes a crusher (1), a conveyor belt (2), a sulfur melting kettle (3), a metering kettle (4), a sublimation kettle (5), a condenser (6), a finished product kettle (7), a slicer (8), and a finished sulfur storage silo (9) connected in series.

2. The sulfur refining system according to claim 1, characterized in that, A vibrating screen (10) is provided between the crusher (1) and the conveyor belt (2); The fine material output end of the vibrating screen (10) is connected to the conveyor belt (2), and the coarse material output end is connected to the crusher (1).

3. The sulfur refining system according to claim 1, characterized in that, The conveyor belt (2) is also connected to the caustic soda feeding tank (21).

4. The sulfur refining system according to claim 1, characterized in that, The sulfur melting kettle (3) includes an integrally enclosed kettle body (31); A liquid sulfur outlet (301) is provided on the upper part of one side of the vessel body (31), and a feeder (32) is provided on the top of the vessel body (31) away from the liquid sulfur outlet (301). The top of the vessel body (31) is connected to the waste gas treatment device (33) via a gas outlet (302); A stirrer (34) is also provided inside the vessel body (31); a heat exchange jacket (35) is provided outside the vessel body (31).

5. The sulfur refining system according to claim 4, characterized in that, The gas inlet of the condenser (6) is connected to the sublimation kettle (5), and the gas outlet is connected to the waste gas treatment device (33). The heat exchange medium input end of the condenser (6) is connected to the hot water supply network (61), and the heat exchange medium output end is connected to the steam-water separator (62) and the steam network (63) in sequence.

6. The sulfur refining system according to claim 2, characterized in that, The vibrating screen (10) includes a vibrating screen body (101), with a fine material output end at the bottom and a coarse material output end on one side. The upper part of the vibrating screen body (101) is covered with a dust cover (1011). The top of the dust cover (1011) is provided with a feed inlet (1001) away from the coarse material output end of the vibrating screen body (101). The center of the dust cover (1011) is provided with a suction port (1002). The suction port (1002) is connected to the cyclone dust collector (11) and the exhaust fan (12) in sequence. The cyclone dust collector (11) is also connected to the sulfur melting kettle (3).

7. The sulfur refining system according to any one of claims 1-6, characterized in that, The sublimation vessel (5) is also connected to the cold slag vessel (51).

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