Sulfur gasification apparatus and sulfur gasification process

Abstract

The application provides a sulfur gasification device and a sulfur gasification process to improve the service life of the sulfur gasification device and relates to the technical field of sulfur gasification. The sulfur gasification device comprises a liquid sulfur tank and an evaporator; the evaporator is internally provided with a sulfur gasification cavity; the sulfur gasification cavity is internally provided with first heat exchange pipes for heating; the evaporator is provided with an exhaust pipe in communication with the sulfur gasification cavity; the exhaust pipe is provided with a pressure stabilizing valve; and the lower part of the liquid sulfur tank is in communication with the lower part of the sulfur gasification cavity through a sulfur guide pipe to form a communicating vessel structure. The device has a longer service life, the liquid level height of sulfur liquid in the sulfur gasification cavity is more convenient to control, the most easily corroded position of the device is controllable, the easily corroded position is convenient to treat in advance, and the service life of the device is more favorable to guarantee.

Description

Technical Field

[0001] This invention relates to the field of sulfur gasification technology, specifically to sulfur gasification apparatus and sulfur gasification process. Background Technology

[0002] Sulfur is a commonly used industrial raw material. Besides being used to produce sulfuric acid, it can also be used in rubber, papermaking, pharmaceuticals, matches, pesticides, and bleaching agents. Industrial applications of sulfur often require it to be converted into sulfur vapor before use.

[0003] Currently, common sulfur gasification devices mainly employ tubular gasifiers. For example, patent application CN201410898861, entitled "A Superheated Sulfur Steam Manufacturing Process," discloses a superheated sulfur steam manufacturing device, including a gasifier containing a liquid sulfur heater, a tubular gasifier, and a superheater. Although tubular gasifiers have high heat exchange efficiency, due to the strong corrosiveness of sulfur and the small inner diameter of the tubes in the tubular gasifier resulting in a large sulfur gasification area, sulfur evaporation causes severe scouring within the gasifier's tubes (heat exchange tubes), especially at the liquid sulfur surface. This leads to the continuous shedding of the corrosion layer on the surface of the gasifier's tubes (heat exchange tubes), resulting in continuous corrosion of the gasifier's tubes (heat exchange tubes) by sulfur. Furthermore, since evaporation occurs within the tubes (heat exchange tubes), the tubes cannot be completely submerged in the liquid sulfur, and the sulfur level within the tubes cannot be controlled. This makes it difficult to control the location of corrosion points and to preemptively address corrosion. Additionally, the temperature in the unsubmerged parts of the tubes can exceed design values. Therefore, tube-type vaporizers suffer from a short service life. Once the vaporizer is damaged by the strong corrosive effects of sulfur vapor, leading to sulfur vapor leakage, shutdown is necessary, severely impacting production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a sulfur gasification device and a sulfur gasification process to improve the service life of the sulfur gasification device.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a sulfur gasification device, including a liquid sulfur tank and an evaporator; the evaporator is provided with a sulfur gasification chamber, the sulfur gasification chamber is provided with a first heat exchange tube for heating, the evaporator is provided with an exhaust pipe communicating with the sulfur gasification chamber, the exhaust pipe is provided with a pressure stabilizing valve, and the lower part of the liquid sulfur tank is connected to the lower part of the sulfur gasification chamber through a sulfur guide pipe to form a communicating vessel structure.

[0006] Furthermore, the first heat exchange tube is provided with a heat medium channel for passing heat medium, and the inlet end of the first heat exchange tube is provided with a flow control valve.

[0007] Furthermore, a filter screen is provided at the inlet of the sulfur guide pipe.

[0008] Furthermore, a second heat exchange tube is provided inside the liquid sulfur tank.

[0009] Furthermore, the second heat exchange tube is also provided with a heat medium channel for passing heat medium, and the inlet end of the second heat exchange tube is also provided with a flow control valve.

[0010] Furthermore, the liquid sulfur tank is provided with multiple layers of the second heat exchange tubes arranged sequentially from top to bottom.

[0011] Furthermore, the sidewall of the sulfur gasification chamber is provided with a sulfur liquid surface fluctuation zone located above the first heat exchange tube, and the sulfur liquid surface fluctuation zone is provided with an anti-corrosion plate that fits against the sidewall of the sulfur gasification chamber.

[0012] Furthermore, it also includes a superheater, with the outlet end of the pressure regulating valve connected to the inlet of the superheater.

[0013] The sulfur gasification process, using the aforementioned sulfur gasification device, includes: firstly, adding liquid sulfur into the sulfur gasification chamber through a liquid sulfur tank, and then heating the liquid sulfur in the sulfur gasification chamber through a first heat exchange tube to vaporize the liquid sulfur. During the sulfur gasification process, the pressure in the sulfur gasification chamber is maintained at a set value through the pressure stabilizing valve. The liquid level of the liquid sulfur in the sulfur gasification chamber is controlled by controlling the liquid level of the liquid sulfur in the liquid sulfur tank, thereby maintaining the liquid level of the liquid sulfur in the sulfur gasification chamber at the set value.

[0014] The beneficial effects of this invention are:

[0015] The sulfur gasification device and process of the present invention, by placing liquid sulfur in the sulfur gasification chamber of the evaporator and then heating and evaporating it through the first heat exchange tube in the sulfur gasification chamber, can completely immerse the first heat exchange tube in the liquid sulfur. By utilizing the boiling point of sulfur, the temperature of the first heat exchange tube is kept near the boiling point of sulfur, preventing overheating, improving the service conditions of the heat exchange tube, increasing the life of the heat exchange tube, and the scouring effect of sulfur evaporation on the evaporator is small, which has a relatively small impact on the service life of the evaporator. The device has a longer service life.

[0016] In this invention, when liquid sulfur evaporates, the first heat exchange tube is completely immersed in the liquid sulfur, and most of the heat from the first heat exchange tube enters the liquid sulfur. Compared with the method of liquid sulfur evaporating in the tube (heat exchange tube), this invention makes it easier to control the amount of sulfur evaporation by controlling the heat of the first heat exchange tube, and is more conducive to the accurate control of the amount of sulfur evaporation.

[0017] The device of the present invention can control the liquid level of sulfur in the sulfur vaporization chamber by controlling the liquid level of sulfur in the liquid sulfur tank, so that the liquid level of sulfur in the sulfur vaporization chamber is maintained within a pre-set area. Controlling the liquid level of sulfur in the sulfur vaporization chamber is more convenient, making the most corroded position of the device controllable, facilitating the early treatment of the corroded position, and further helping to ensure the service life of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the first heat exchange tube setup;

[0020] The diagram shows: liquid sulfur tank 1, evaporator 2, sulfur guide pipe 3, first heat exchange pipe 4, pressure regulating valve 5, filter screen 6, second heat exchange pipe 7, superheater 8, sulfur vaporization chamber 21, anti-corrosion plate 22, exhaust pipe 23, heat medium channel 41, and flow control valve 42. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 , Figure 2 As shown, the sulfur gasification device of the present invention includes a liquid sulfur tank 1 and an evaporator 2; the evaporator 2 is provided with a sulfur gasification chamber 21 for evaporating and gasifying liquid sulfur, the sulfur gasification chamber 21 is provided with a first heat exchange tube 4 for heating the liquid sulfur in the sulfur gasification chamber 21, the evaporator 2 is provided with an exhaust pipe 23 communicating with the sulfur gasification chamber 21, the exhaust pipe 23 is provided with a pressure regulating valve 5, and the lower part of the liquid sulfur tank 1 is connected to the lower part of the sulfur gasification chamber 21 through a sulfur guide pipe 3 to form a communicating vessel structure.

[0023] It is understandable that, in order to facilitate exhaust, the exhaust pipe 23 should be located at the top of the sulfur vaporization chamber 21, that is, connected to the top of the sulfur vaporization chamber 21; during sulfur vaporization, the sulfur liquid level in the sulfur vaporization chamber 21 should be higher than the height of the first heat exchange tube 4, that is, the first heat exchange tube 4 should be completely immersed in the sulfur liquid.

[0024] To prevent the sulfur liquid from solidifying inside the sulfur conduit 3, the sulfur conduit 3 can be wrapped with insulation material.

[0025] In use, the sulfur gasification device of the present invention first adds liquid sulfur at approximately 200°C to the sulfur gasification chamber 21 through the liquid sulfur tank 1, ensuring that the liquid sulfur in the sulfur gasification chamber 21 covers the first heat exchange tube 4. Then, the liquid sulfur in the sulfur gasification chamber 21 is heated through the first heat exchange tube 4 to 450°C-550°C, causing the liquid sulfur to vaporize and produce sulfur vapor at 450°C-550°C, which is finally discharged from the exhaust pipe 23. Because the sulfur gasification device of the present invention places the liquid sulfur in the sulfur gasification chamber 21 of the evaporator 2 and then heats and evaporates it through the first heat exchange tube 4 within the sulfur gasification chamber 21, that is, sulfur gasification occurs outside the first heat exchange tube 4, rather than inside the heat exchange tube. This utilizes the boiling point of sulfur to maintain the temperature of the first heat exchange tube 4 near the boiling point of sulfur, preventing overheating, improving the service conditions of the heat exchange tube, and increasing its lifespan. Furthermore, since sulfur vaporization occurs within the sulfur vaporization chamber 21 outside the first heat exchange tube 4, the scouring effect on the evaporator 2 during sulfur evaporation is less compared to when it occurs inside the heat exchange tube, resulting in a relatively smaller impact on the service life of the evaporator 2. Therefore, the device has a longer service life. Additionally, due to the high temperature and corrosiveness of sulfur vapor within the sulfur vaporization chamber 21, it is difficult to control the sulfur liquid level within the chamber by measuring the sulfur liquid level and maintaining it within a set range. Because the temperature of the liquid sulfur in the liquid sulfur tank 1 is low, the height of the liquid sulfur in the tank 1 can be directly measured by observation and using a conventional liquid level sensor. Therefore, during the sulfur vaporization process, the pressure in the sulfur vaporization chamber 21 can be maintained at a set value by the pressure regulating valve 5. Based on the principle of communicating vessels, the liquid level in the sulfur vaporization chamber 21 can be determined by measuring the liquid level in the liquid sulfur tank 1. Furthermore, the liquid level in the sulfur vaporization chamber 21 can be controlled by controlling the liquid level in the liquid sulfur tank 1, thus maintaining the liquid level in the sulfur vaporization chamber 21 within a pre-set range. This device facilitates control of the liquid level in the sulfur vaporization chamber 21, making the most corroded areas controllable and allowing for pre-treatment of these areas, thereby extending the device's service life.

[0026] The sulfur gasification device of the present invention can control the output of sulfur vapor by controlling the heat of the first heat exchange tube 4. In some embodiments, the first heat exchange tube 4 is an electric heating tube. In this embodiment, the first heat exchange tube 4 is provided with a heat medium channel 41 for passing a heat medium, that is, the first heat exchange tube 4 is a heat exchange tube for passing a heat medium. When the first heat exchange tube 4 is a heat exchange tube for passing a heat medium, a flow control valve 42 is provided at the inlet end of the first heat exchange tube 4 to facilitate the control of sulfur evaporation. In this way, the amount of heat medium flowing into the first heat exchange tube 4 can be controlled by the flow control valve 42, thereby controlling the evaporation of sulfur in the sulfur gasification chamber 21. Figure 2 As shown, the first heat exchange tube 4 is generally installed in the sulfur gasification chamber 21 using a coil structure.

[0027] To prevent sulfur particles that may be present in the liquid sulfur tank 1 from entering the sulfur vaporization chamber 21, a filter screen 6 for filtering sulfur particles is provided at the inlet of the sulfur guide pipe 3.

[0028] Liquid sulfur can be directly added to the liquid sulfur tank 1, and the liquid level of the liquid sulfur in the tank 1 can be controlled by the amount of liquid sulfur added. In this embodiment of the invention, the liquid sulfur tank 1 is provided with a second heat exchange tube 7. Thus, solid sulfur can be added to the liquid sulfur tank 1 and then heated and melted through the second heat exchange tube 7 to form liquid sulfur. In some embodiments, the second heat exchange tube 7 can also be an electric heating tube. In this embodiment of the invention, the second heat exchange tube 7 is also provided with a heat medium channel 41 for passing a heat medium; that is, the second heat exchange tube 7 is also a heat exchange tube for passing a heat medium. When the second heat exchange tube 7 is a heat exchange tube for passing a heat medium, in order to facilitate the control of the sulfur melting rate through the second heat exchange tube 7, and thus control the liquid sulfur level in the liquid sulfur tank 1, a flow control valve 42 is also provided at the inlet end of the second heat exchange tube 7. The second heat exchange tube 7 is usually also arranged in a coil structure in the liquid sulfur tank 1.

[0029] A second heat exchange tube 7 can be installed inside the liquid sulfur tank 1. In this embodiment of the invention, multiple layers of the second heat exchange tube 7 are arranged sequentially from top to bottom inside the liquid sulfur tank 1. With the above structure, the operation of the heat exchange tubes of different layers of the second heat exchange tube 7 can be controlled by the corresponding flow control valve 42, thereby making it easier to control the speed of sulfur melting and to adjust or control the height of the sulfur liquid level in the liquid sulfur tank 1 as needed.

[0030] The sulfur vaporization chamber 21 of this invention has a sulfur liquid surface fluctuation zone located above the first heat exchange tube 4 on its side wall. The sulfur liquid surface fluctuation zone is fitted with an anti-corrosion plate 22 that adheres to the side wall of the sulfur vaporization chamber 21. The anti-corrosion plate 22 can be fixed to the side wall of the sulfur vaporization chamber 21 using conventional connection methods such as snap-fit, bolt connection, or adhesive bonding. The anti-corrosion plate 22 in the sulfur liquid surface fluctuation zone better protects the evaporator side wall at that location, thus better ensuring the service life of the equipment.

[0031] The present invention also includes a superheater 8, with the outlet of the pressure regulating valve 5 connected to the inlet of the superheater 8. The superheater 8 heats the sulfur vapor flowing out of the evaporator 2 to approximately 700°C, forming superheated sulfur vapor for use. The superheater 8 can be any conventional heater or heat exchanger.

Claims

1. A sulfur gasification device, characterized in that, It includes a liquid sulfur tank (1) and an evaporator (2); the evaporator (2) is provided with a sulfur vaporization chamber (21), the sulfur vaporization chamber (21) is provided with a first heat exchange tube (4) for heating, the evaporator (2) is provided with an exhaust pipe (23) communicating with the sulfur vaporization chamber (21), the exhaust pipe (23) is provided with a pressure regulating valve (5), and the lower part of the liquid sulfur tank (1) is connected to the lower part of the sulfur vaporization chamber (21) through a sulfur guide pipe (3) to form a communicating vessel structure; The first heat exchange tube (4) is provided with a heat medium channel (41) for passing heat medium, and the inlet end of the first heat exchange tube (4) is provided with a flow control valve (42); The sulfur guide pipe (3) is provided with a filter screen (6) at the inlet, the liquid sulfur tank (1) is provided with a second heat exchange pipe (7), the second heat exchange pipe (7) is also provided with a heat medium channel (41) for heat transfer medium, and the inlet end of the second heat exchange pipe (7) is also provided with a flow control valve (42). The liquid sulfur tank (1) is provided with multiple layers of the second heat exchange tubes (7) arranged sequentially from top to bottom.

2. The sulfur gasification apparatus as described in claim 1, characterized in that, The side wall of the sulfur vaporization chamber (21) is provided with a sulfur liquid surface fluctuation zone located above the first heat exchange tube (4), and the sulfur liquid surface fluctuation zone is provided with an anti-corrosion plate (22) that is attached to the side wall of the sulfur vaporization chamber (21).

3. The sulfur gasification device as described in claim 1, characterized in that, It also includes a superheater (8), and the outlet end of the pressure regulating valve (5) is connected to the inlet of the superheater (8).

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