A sulphur furnace

Abstract

The utility model discloses a sulfur furnace relates to sulfur furnace device technical field, and the inside frame of furnace is divided into melting chamber and combustion chamber along the height direction, the top of melting chamber is equipped with the feed inlet, and the outlet of melting chamber extends to the combustion chamber through the discharge pipeline, one side of the frame of furnace is equipped with cooling fan, and the outlet of cooling fan is communicated to the bottom of melting chamber through the pipeline, and temperature sensor is equipped in melting chamber, and cooling fan and temperature sensor interlock to control system. Sulfur granule is melted into liquid state in melting chamber, then enters the combustion chamber from melting chamber again, and produces sulfur dioxide after combustion. Control system controls the start -stop of cooling fan according to the numerical value of temperature sensor, makes melting chamber material temperature steady at 110~120 DEG C, and the fluctuation is less than or equal to 3 DEG C, and the combustion efficiency is higher, and the cost is greatly saved.

Description

Technical Field

[0001] This utility model relates to the technical field of sulfur furnace devices, specifically to a sulfur furnace. Background Technology

[0002] Sulfur dioxide gas is a crucial raw material for the production of sodium sulfite. In existing technologies, sulfur dioxide gas is obtained by burning sulfur powder in a sulfur furnace. Chinese Patent No. CN203079691U discloses a sulfur combustion furnace, including a furnace body with a feed inlet and a slag outlet at the bottom and a sulfur gas outlet at the top. The feed inlet is connected to an air inlet pipe, which is connected to a high-pressure blower and a sulfur inlet channel. The sulfur inlet channel is connected to a sulfur grinding chamber. The sulfur grinding chamber is equipped with a feeding auger, the drive wheel of which is located outside the sealing plate of the sulfur grinding chamber and connected to the output wheel of a servo motor. The upper part of the sulfur grinding chamber has a hole to which a sulfur hopper is connected; a gate is located at the bottom of the sulfur hopper. The incomplete combustion of granular sulfur leads to waste of raw materials. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a sulfur furnace that melts sulfur before combustion, thereby greatly improving combustion efficiency and saving costs, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A sulfur furnace includes a furnace frame, which is divided into a melting chamber and a combustion chamber along its height. The top of the melting chamber is provided with a feed inlet, and the outlet of the melting chamber extends to the combustion chamber through a discharge pipe.

[0006] A cooling fan is provided on one side of the furnace frame. The outlet of the cooling fan is connected to the bottom of the melting chamber through a pipe. A temperature sensor is provided in the melting chamber. The cooling fan and the temperature sensor are interlocked to the control system.

[0007] As an improved technical solution, the bottom of the melting chamber is provided with a first partition, and the outlet of the cooling fan is connected to the first partition through a pipe.

[0008] As an improved technical solution, a second partition is provided at the bottom of the furnace frame, and the height of the second partition is 20-25cm.

[0009] As an improved technical solution, the melting chamber is provided with an inverted conical accommodating cavity inside, and a conical protrusion is provided in the middle of the accommodating cavity.

[0010] As an improved technical solution, the discharge pipe is located at the lowest end of the conical protrusion, and a guide bend is connected to the end of the discharge pipe.

[0011] As an improved technical solution, the combustion chamber is provided with a first combustion disc, and the guide bend is located directly above the first combustion disc.

[0012] As a preferred technical solution, the bottom of the first combustion plate is provided with an overflow pipe, the inlet end of the overflow pipe is 5-8cm higher than the bottom of the first combustion plate, and a second combustion plate is provided below the overflow pipe;

[0013] The combustion chamber is provided with a first air inlet and a second air inlet, which are adapted to the first combustion plate and the second combustion plate, respectively.

[0014] As a preferred technical solution, the overflow pipe is inclined, and the angle between the overflow pipe and the vertical direction is 5 to 10°.

[0015] As a preferred technical solution, the top of the combustion chamber is provided with a flue gas outlet on the side away from the melting chamber, and the flue gas outlet is connected to an absorption tower through a pipe, and a circulation pump is provided on the outside of the absorption tower.

[0016] As a preferred technical solution, the inlet of the melting chamber is connected to a conveying auger via a pipeline, the other end of the conveying auger is connected to a sulfur granule silo, the melting chamber is equipped with a liquid level sensor, and the liquid level sensor and the drive motor of the conveying auger are interlocked to the control system.

[0017] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0018] This utility model discloses a sulfur furnace, including a furnace frame. The furnace frame is divided into a melting chamber and a combustion chamber along its height. The melting chamber has a feed inlet at its top and an outlet extending to the combustion chamber via a discharge pipe. A cooling fan is located on one side of the furnace frame, and its outlet is connected to the bottom of the melting chamber via a pipe. A temperature sensor is installed inside the melting chamber, and the cooling fan and the temperature sensor are interlocked to a control system. Sulfur particles enter the melting chamber and are melted into a liquid state before entering the combustion chamber, where they burn to produce sulfur dioxide. The control system controls the start and stop of the cooling fan based on the temperature sensor readings, stabilizing the material temperature in the melting chamber at 110–120°C with fluctuations ≤ ±3°C, resulting in higher combustion efficiency and significant cost savings.

[0019] The bottom of the melting chamber of this invention is provided with a first partition, and the outlet of the cooling fan is connected to the first partition through a pipe. The design of the first partition allows the cooling air to form a uniform airflow distribution space at the bottom of the melting chamber, avoiding the cooling air directly impacting local areas at the bottom of the melting chamber and causing a sudden drop in temperature. This makes the overall temperature regulation of the melting chamber more gradual and uniform, improves the uniformity of sulfur melting, and reduces the problem of incomplete melting caused by local temperature differences.

[0020] The bottom of the furnace frame is provided with a second partition, the height of which is 20-25cm. The second partition forms a buffer space at the bottom of the furnace, which on the one hand reduces the erosion of the furnace bottom by ground moisture and impurities, extending the service life of the furnace; on the other hand, it reduces the intensity of vibrations generated during furnace operation transmitted to the ground, reducing the vibration interference of equipment operation on the surrounding environment. It also facilitates the inspection or maintenance of bottom pipelines by personnel within the partition, improving the convenience of equipment maintenance.

[0021] The melting chamber has an inverted conical cavity inside, with a conical protrusion in the center. The inverted conical cavity guides sulfur particles to converge towards the bottom of the cavity, preventing sulfur from accumulating in dead corners and improving material utilization. The conical protrusion in the center disperses the melted liquid sulfur around the perimeter of the cavity, increasing the contact area between the liquid sulfur and the melting chamber wall, accelerating heat transfer efficiency, shortening the sulfur melting time, and improving melting efficiency.

[0022] The discharge pipe is located at the lowest end of the conical protrusion, and a guide bend is connected to the end of the discharge pipe. The location of the discharge pipe at the lowest end of the conical protrusion ensures that the molten liquid sulfur is discharged as quickly as possible under gravity. The guide bend changes the direction of liquid sulfur transport, allowing it to be smoothly transported to the designated position in the combustion chamber, preventing splashing due to excessive flow rate or sudden changes in direction during transport, thus reducing material waste and safety hazards.

[0023] The combustion chamber is equipped with a first combustion plate, and the guide bend is located directly above the first combustion plate. The first combustion plate provides a stable combustion surface for sulfur combustion, ensuring that the combustion reaction proceeds in an orderly manner; the guide bend, located directly above the first combustion plate, can accurately deliver liquid sulfur to the central area of ​​the combustion plate, so that the sulfur is evenly distributed on the combustion plate, avoiding local accumulation that leads to incomplete combustion, improving sulfur combustion efficiency, and reducing the waste of unburned sulfur.

[0024] The first combustion plate has an overflow pipe at its bottom, with the inlet end of the overflow pipe 5-8 cm higher than the bottom of the first combustion plate. A second combustion plate is located below the overflow pipe. The combustion chamber has a first air inlet and a second air inlet adapted to the first and second combustion plates, respectively. The overflow pipe, with its inlet end 5-8 cm higher than the bottom of the first combustion plate, maintains a certain level of liquid sulfur in the first combustion plate, ensuring continuous and stable combustion. Simultaneously, when the amount of sulfur in the first combustion plate exceeds a set height, it can flow through the overflow pipe to the second combustion plate for continued combustion, achieving staged combustion of sulfur and improving material utilization. The adapted first and second air inlets provide sufficient and appropriate air volume to each combustion plate, ensuring complete combustion of sulfur in each combustion plate, reducing harmful gas emissions, and meeting environmental protection requirements. The staged combustion structure (first combustion plate + second combustion plate) achieves secondary combustion of sulfur through the overflow pipe, reducing waste and increasing combustion utilization by 10%-15%.

[0025] The overflow pipe is inclined, with an angle of 5–10° between the overflow pipe and the vertical direction. This 5–10° inclination angle controls the flow rate of liquid sulfur within the overflow pipe, preventing both excessively slow flow that could cause blockage and excessively fast flow that could cause splashing when the liquid sulfur enters the second combustion pan. This ensures a smooth and orderly transition of sulfur from the first combustion pan to the second combustion pan, guaranteeing the smoothness of staged combustion.

[0026] A flue gas outlet is located at the top of the combustion chamber, away from the melting chamber. This outlet is connected to an absorption tower via a pipe, and a circulating pump is installed on the outside of the absorption tower. The location of the flue gas outlet away from the melting chamber prevents the flue gas generated during combustion from diffusing into the melting chamber, thus preventing impurities in the flue gas from affecting the quality of sulfur melting. The combination of the absorption tower and the circulating pump enables efficient treatment of the flue gas generated during combustion. The negative pressure generated by the circulating pump draws the flue gas away from the combustion chamber, through the absorption tower, and transports it to subsequent stages, ensuring smooth flue gas discharge from the furnace and preventing gas accumulation that could affect combustion efficiency.

[0027] The inlet of the melting chamber is connected to a conveying auger via a pipeline. The other end of the conveying auger is connected to a sulfur granule hopper. The melting chamber is equipped with a liquid level sensor, and the liquid level sensor and the drive motor of the conveying auger are interlocked to the control system. The arrangement of the conveying auger and the sulfur granule hopper enables automatic and continuous conveying of sulfur granules, reducing the labor intensity of manual feeding and improving feeding efficiency. The interlocked control of the liquid level sensor and the drive motor of the conveying auger can monitor the liquid sulfur level in the melting chamber in real time. When the liquid level is lower than the set value, the conveying auger is automatically started to replenish the liquid; when the liquid level is higher than the set value, the replenishment is automatically stopped, ensuring a stable liquid sulfur level in the melting chamber. This provides a continuous and stable material supply for subsequent combustion processes, improving the automation and stability of the overall equipment operation. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0030] Figure 2 yes Figure 1 Schematic diagram of the structure of the central furnace frame;

[0031] Figure 3 yes Figure 1 Schematic diagram of the middle melting chamber;

[0032] The components include: 1. Furnace frame; 2. Melting chamber; 3. Combustion chamber; 4. Discharge pipe; 5. Cooling fan; 6. Temperature sensor; 7. Control system; 8. First compartment; 9. Second compartment; 10. Receptacle; 11. Conical protrusion; 12. Guide bend; 13. First combustion plate; 14. Overflow pipe; 15. Second combustion plate; 16. First air inlet; 17. Second air inlet; 18. Smoke outlet; 19. Absorption tower; 20. Circulation pump; 21. Conveying auger; 22. Sulfur pellet silo; 23. Liquid level sensor; 24. Cooling air outlet; 25. Drive motor. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1-3 As shown, a sulfur furnace includes a furnace frame 1. In this embodiment, the furnace frame is 2m long and 1.2m wide. The furnace frame 1 is divided into a melting chamber 2 and a combustion chamber 3 along its height. The melting chamber 2 is 65cm long, and the combustion chamber 3 is 1.2m long. The melting chamber 2 can be cylindrical or square. The top of the combustion chamber 3 is made of 316L stainless steel plate with a thickness of ≥120mm. The outer shell of the furnace is insulated with rock wool (10-15cm thick). The top of the melting chamber 2 is provided with a feed inlet, and the outlet of the melting chamber 2 extends to the combustion chamber 3 through a discharge pipe 4. A cooling fan 5 is provided on one side of the furnace frame 1. The outlet of the cooling fan 5 is connected to the bottom of the melting chamber 2 through a pipe. A temperature sensor 6 is provided inside the melting chamber 2. The cooling fan 5 and the temperature sensor 6 are interlocked to a control system 7. Sulfur particles enter the melting chamber 2 and are melted into a liquid state. Then, they enter the combustion chamber 3 from the melting chamber 2 and burn to produce sulfur dioxide. The control system 7 controls the start and stop of the cooling fan 5 based on the temperature sensor 6, stabilizing the material temperature in the melting chamber 2 at 110–120℃ with fluctuations ≤ ±3℃, resulting in higher combustion efficiency and significant cost savings. In this embodiment, the cooling fan 5 uses an air volume of 800–1200 m³ / h. 3Models with a speed of / h, power of 0.37~0.75kW, and speed of 1400 rpm,

[0035] The bottom of the melting chamber 2 is provided with a first partition 8, and the outlet of the cooling fan 5 is connected to the first partition 8 through a pipe. The other end of the first partition 8 is provided with a cooling air outlet 24. The design of the first partition 8 makes the cooling air form a uniform airflow distribution space at the bottom of the melting chamber 2, avoiding the cooling air directly impacting the local area at the bottom of the melting chamber 2 and causing a sudden drop in temperature. This makes the overall temperature regulation of the melting chamber 2 more gradual and uniform, improves the uniformity of sulfur melting, and reduces the problem of incomplete melting caused by local temperature differences.

[0036] The bottom of the furnace frame 1 is provided with a second partition 9, the height of which is 20-25cm. The second partition 9 can form a buffer space at the bottom of the furnace body, which can reduce the erosion of the furnace bottom by ground moisture and impurities, and extend the service life of the furnace body. On the other hand, it can reduce the intensity of vibrations generated during furnace operation transmitted to the ground, reduce the vibration interference of equipment operation on the surrounding environment, and at the same time facilitate the inspection or maintenance of bottom pipelines by staff in the partition, thus improving the convenience of equipment maintenance.

[0037] The melting chamber 2 has an inverted conical cavity 10 inside, with a conical protrusion 11 in the middle. The inverted conical cavity 10 guides sulfur particles to converge towards the bottom of the cavity, preventing sulfur from accumulating in dead corners inside the melting chamber 2 and improving material utilization. The conical protrusion 11 in the middle disperses the melted liquid sulfur around the perimeter of the cavity 10, increasing the contact area between the liquid sulfur and the wall of the melting chamber 2, accelerating heat transfer efficiency, shortening the sulfur melting time, and improving melting efficiency.

[0038] The discharge pipe 4 is located at the lowest end of the conical protrusion 11, and a guide bend 12 is connected to the end of the discharge pipe 4. The discharge pipe 4 is located at the lowest end of the conical protrusion 11, which can ensure that the molten liquid sulfur is discharged as soon as possible under the action of gravity; the guide bend 12 can change the conveying direction of the liquid sulfur, so that the liquid sulfur is smoothly conveyed to the designated position in the combustion chamber 3, preventing the liquid sulfur from splashing due to excessive flow rate or sudden change in direction during the conveying process, reducing material waste and safety hazards.

[0039] The combustion chamber 3 is equipped with a first combustion plate 13, and the guide bend 12 is located directly above the first combustion plate 13. The first combustion plate 13 provides a stable combustion surface for sulfur combustion, ensuring that the combustion reaction proceeds in an orderly manner; the guide bend 12, located directly above the first combustion plate 13, can accurately deliver liquid sulfur to the central area of ​​the combustion plate, so that the sulfur is evenly distributed on the combustion plate, avoiding local accumulation that leads to incomplete combustion, improving sulfur combustion efficiency, and reducing the waste of unburned sulfur.

[0040] An overflow pipe 14 is provided at the bottom of the first combustion plate 13, with the inlet end of the overflow pipe 14 being 5-8 cm higher than the bottom of the first combustion plate 13. A second combustion plate 15 is provided below the overflow pipe 14. The combustion chamber 3 is provided with a first air inlet 16 and a second air inlet 17 adapted to the first combustion plate 13 and the second combustion plate 15, respectively. The overflow pipe 14, with its inlet end 5-8 cm higher than the bottom of the first combustion plate 13, allows the liquid sulfur in the first combustion plate 13 to maintain a certain height, ensuring continuous and stable combustion. At the same time, when the amount of sulfur in the first combustion plate 13 exceeds the set height, it can flow through the overflow pipe 14 to the second combustion plate 15 to continue burning, realizing staged combustion of sulfur and improving material utilization. The adapted first and second air inlets 17 can provide sufficient and appropriate air volume to the two combustion plates respectively, ensuring that the sulfur in each combustion plate can be fully burned, reducing the emission of harmful gases and meeting environmental protection requirements.

[0041] The overflow pipe 14 is inclined, with an angle of 5 to 10° between the overflow pipe 14 and the vertical direction. The 5 to 10° inclination angle can control the flow rate of liquid sulfur in the overflow pipe 14, avoiding both excessively slow flow rate leading to pipe blockage and excessively fast flow rate causing splashing when liquid sulfur enters the second combustion pan 15, ensuring that sulfur smoothly and orderly transitions from the first combustion pan 13 to the second combustion pan 15, and guaranteeing the smoothness of staged combustion.

[0042] A flue gas outlet 18 is located on the top of the combustion chamber 3, away from the melting chamber 2. The flue gas outlet 18 is connected to an absorption tower 19 via a pipe, and a circulating pump 20 is located on the outside of the absorption tower 19. The flue gas outlet 18 is positioned away from the melting chamber 2 to prevent the flue gas generated during combustion from diffusing into the melting chamber 2, thus preventing impurities in the flue gas from affecting the quality of sulfur melting. The combination of the absorption tower 19 and the circulating pump 20 efficiently treats the flue gas generated during combustion. The negative pressure generated by the circulating pump 20 draws the flue gas away from the combustion chamber 3, through the absorption tower 19, and transports it to subsequent stages, ensuring smooth flue gas discharge from the furnace and preventing gas accumulation that could affect combustion efficiency. In this embodiment, the circulating pump 20 is a hydraulic jet pump with the following parameters: power 18.5kW, voltage 380V, current approximately 34A, speed 2900 rpm, and flow rate 100m³ / min. 3 / h.

[0043] The inlet of the melting chamber 2 is connected to a conveying auger (φ110) 21 via a pipe. In this embodiment, the conveying auger 21 adopts progressive blades, with a blade pitch of 2-3 cm at the feed section and 5-6 cm at the discharge end. This reduces clogging and wear, improves efficiency, reduces the power of the auger motor, and further saves energy. The other end of the conveying auger 21 is connected to a sulfur granule silo 22. The melting chamber 2 is equipped with a liquid level sensor 23, and the liquid level sensor 23 and the drive motor 25 of the conveying auger 21 are interlocked to the control system 7. The installation of the conveying auger 21 and the sulfur granule bin 22 enables automatic and continuous conveying of sulfur granules, reducing the labor intensity of manual feeding and improving feeding efficiency. The interlocking control between the liquid level sensor 23 and the drive motor of the conveying auger 21 can monitor the liquid level of the liquid sulfur in the melting chamber 2 in real time. When the liquid level is lower than the set value, the conveying auger 21 is automatically started to replenish the material, and when it is higher than the set value, the replenishment is automatically stopped, ensuring the stability of the liquid sulfur level in the melting chamber 2. This provides a continuous and stable material supply for the subsequent combustion process and improves the automation and stability of the overall equipment operation.

[0044] The working principle of this utility model:

[0045] In actual use, sulfur granules are fed into the melting chamber 2 at a rate of 1 ton per day via the conveying auger 21. After being ignited in the combustion chamber 3, the generated heat is conducted to the melting chamber 2 through the first partition 8. The temperature sensor 6 in the middle of the melting chamber 2 detects the temperature in real time and transmits it to the control system 7 (Siemens S7-200 series PLC): when the temperature is ≥118℃, the control system 7 starts the cooling fan 5, and cold air enters the first partition 8 to remove excess heat; when the temperature is ≤112℃, the control system 7 shuts down the cooling fan 5 to reduce heat loss; after 24 hours of continuous operation testing, the temperature is stable at 110~120℃, with fluctuations ≤±3℃. Sulfur particles melt into liquid at this temperature and flow to the first combustion pan 13 for primary combustion. If there is too much sulfur in the first combustion pan 13, it flows to the second combustion pan 15 through the overflow pipe 14 for secondary combustion. The flue gas generated by combustion is discharged from the exhaust port 18 and enters the absorption tower 19 through the connecting pipe. It is then drawn away and transported out by the negative pressure generated by the circulation pump 20, ensuring smooth exhaust of flue gas in the furnace.

[0046] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A sulfur furnace, comprising a furnace frame, characterized in that: The furnace frame is divided into a melting chamber and a combustion chamber along the height direction. The top of the melting chamber is provided with a feed inlet, and the outlet of the melting chamber extends to the combustion chamber through a discharge pipe. A cooling fan is provided on one side of the furnace frame. The outlet of the cooling fan is connected to the bottom of the melting chamber through a pipe. A temperature sensor is provided in the melting chamber. The cooling fan and the temperature sensor are interlocked to the control system.

2. A sulfur furnace as described in claim 1, characterized in that: The bottom of the melting chamber is provided with a first partition, and the outlet of the cooling fan is connected to the first partition through a pipe.

3. A sulfur furnace as described in claim 1, characterized in that: The bottom of the furnace frame is provided with a second partition, the height of which is 20-25cm.

4. A sulfur furnace as described in claim 1, characterized in that: The melting chamber has an inverted conical cavity inside, and a conical protrusion is provided in the middle of the cavity.

5. A sulfur furnace as described in claim 4, characterized in that: The discharge pipe is located at the lowest end of the conical protrusion, and a guide bend is connected to the end of the discharge pipe.

6. A sulfur furnace as described in claim 5, characterized in that: The combustion chamber is provided with a first combustion plate, and the guide bend is located directly above the first combustion plate.

7. A sulfur furnace as described in claim 6, characterized in that: An overflow pipe is provided at the bottom of the first combustion plate, and the inlet end of the overflow pipe is 5-8 cm higher than the bottom of the first combustion plate. A second combustion plate is provided below the overflow pipe. The combustion chamber is provided with a first air inlet and a second air inlet, which are adapted to the first combustion plate and the second combustion plate, respectively.

8. A sulfur furnace as described in claim 7, characterized in that: The overflow pipe is inclined, and the angle between the overflow pipe and the vertical direction is 5 to 10°.

9. A sulfur furnace as described in claim 1, characterized in that: The combustion chamber has a flue gas outlet on the top side away from the melting chamber. The flue gas outlet is connected to an absorption tower via a pipe. A circulation pump is installed on the outside of the absorption tower.

10. A sulfur furnace as described in claim 1, characterized in that: The inlet of the melting chamber is connected to a conveying auger via a pipe, and the other end of the conveying auger is connected to a sulfur granule silo. The melting chamber is equipped with a liquid level sensor, and the liquid level sensor and the drive motor of the conveying auger are interlocked to the control system.

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