Sulfur refining process system
By using the melting and refining two-stage melting process and Venturi jetting technology in the sulfur refining process system, the existing sulfur refining process has solved the problems of high energy consumption, complex processes and difficult to remove impurities, and achieved efficient and economical sulfur refining effect.
Patent Information
- Application Number
- CN202420697824.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-04-08
AI Technical Summary
The existing sulfur purification process has problems such as high energy consumption, complex process and difficult to remove impurities, resulting in low sulfur purity and difficult to meet the usage standards.
A process system is adopted, including a sulfur slurry stirring tank, a sulfur melting kettle, a refined sulfur kettle, a Venturi injector and an air heater. Through the melting and refined sulfur melting process, combined with the Venturi jet technology, the impurities in the sulfur phase are air-floated to the aqueous phase or oil phase to improve the purity of sulfur.
It achieves efficient refining of sulfur, reduces energy consumption and process complexity, improves the purity of sulfur, and is suitable for promotion and application.
Smart Images
Figure CN222647654U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sulfur refining, in particular to a process system for sulfur refining. Background Art
[0002] As we all know, before using coal gas as fuel, it is necessary to desulfurize the coal gas, otherwise the sulfur content in the flue gas will exceed the standard. If this is the case, the flue gas after combustion needs to be desulfurized. Taking all factors into consideration, the cost and investment of desulfurizing coal gas are much lower than those of flue gas, so the desulfurization method of coal gas desulfurization is currently commonly used. PDS desulfurization technology is the most widely used coal gas desulfurization technology, but in most cases the sulfur produced by the PDS process is not of high purity, usually between 50-90%, which contains many impurities and has a complex composition. In summary, impurities are mainly divided into two categories: inorganic salts and tar. If this crude sulfur is not refined to meet the sulfur use standards, it will be difficult to sell, which will bring great pressure to the company.
[0003] There are many sulfur processing and refining processes, such as the melt vaporization method. This method consumes too much energy and organic matter will be introduced into the sulfur. Another example is the organic solvent method. This method has a complicated process and requires the introduction of new solvents. The solvents will be introduced into the water phase, causing secondary pollution, and the sulfur yield is not high. Another example is the heating and water washing method. The sulfur produced by this method is not pure enough, and there is no reasonably designed heat network, resulting in high energy consumption. Utility Model Content
[0004] In view of the above problems, the utility model proposes a sulfur refining process system, which does not require the introduction of new solvents and rationally designs the heat network, so that crude sulfur can be refined.
[0005] To achieve the above objectives, the following technical scheme is adopted: A sulfur refining process system, including a sulfur slurry stirring tank, a sulfur melting kettle, a sulfur refining kettle, a venturi ejector and an air heater, wherein:
[0006] A crude sulfur inlet is provided on the top of the sulfur slurry stirring tank. The top of the sulfur slurry stirring tank is externally connected to a hot water inlet pipeline, and the bottom is connected to the upper section of the molten sulfur kettle through a feed pump.
[0007] The molten sulfur kettle is provided with a heating structure, the top of the molten sulfur kettle is connected to the middle section of the refined sulfur kettle, and the bottom is connected to the bottom of the refined sulfur kettle through a liquid sulfur filter.
[0008] A spray mechanism that sprays upward is arranged at the bottom of the refined sulfur kettle. The top of the refined sulfur kettle is externally connected to an exhaust pipeline, the bottom is externally connected to a sulfur discharge pipeline, and at the same time is connected to a venturi ejector through a circulating pump. The upper section of the refined sulfur kettle is externally connected to an oil discharge pipeline, and the middle section of the refined sulfur kettle is respectively connected to a reflux hot water pipeline and a salt discharge pipeline through a hot water filter. A brine cooler is arranged on the salt discharge pipeline, and the reflux hot water pipeline is connected to a hot water inlet pipeline. The venturi ejector is respectively connected to the spray mechanism and the air heater in the refined sulfur kettle, and the air heater is externally connected to a compressed air inlet pipeline.
[0009] Control valves with corresponding functions are arranged on the hot water inlet pipeline, compressed air inlet pipeline, reflux hot water pipeline, salt discharge pipeline, exhaust pipeline, oil discharge pipeline and sulfur discharge pipeline.
[0010] Furthermore, a sulfur slurry level control line is arranged on the sulfur slurry stirring tank and a sulfur slurry level controller is arranged at a corresponding position, a water phase level control line and an oil phase level control line are arranged on the refined sulfur kettle and a water phase level controller and an oil phase level controller are arranged correspondingly, the sulfur slurry level controller is connected to the control valve on the salt discharge pipeline and controls its opening and closing, the water phase level controller is connected to the control valve on the reflux hot water pipeline and controls its opening and closing, and the oil phase level controller is connected to the control valve on the oil discharge pipeline and controls its opening and closing.
[0011] Furthermore, a baffle with an L-shaped cross-section is installed on the inner wall of the upper section of the refined sulfur kettle to ensure that after the liquid level in the kettle rises, the upper liquid enters the groove formed by the baffle and the inner wall of the refined sulfur kettle.
[0012] Furthermore, the heating structure of the molten sulfur kettle adopts a heating coil structure arranged inside the kettle, a first jacket is arranged at a position on the outer wall of the kettle corresponding to the heating coil, and the first jacket is externally connected to a first heat transfer liquid pipeline.
[0013] Furthermore, a second jacket is arranged on the outer wall of the bottom of the refined sulfur kettle, and the second jacket is externally connected to a second heat transfer liquid pipeline.
[0014] Furthermore, the second jacket on the refined sulfur kettle maintains the temperature of the sulfur phase in the kettle greater than 125°C.
[0015] Furthermore, the top pressure of the refined sulfur reactor is controlled within the range of 0.3-0.5 MPag.
[0016] Furthermore, the temperature of the gas injected by the Venturi injector is greater than 125°C.
[0017] The utility model has the following beneficial effects: the utility model processes crude sulfur through two stages of melting and refining. In the refining stage, the refining kettle divides the molten sulfur liquid into three layers from top to bottom: oil phase, water phase and sulfur phase. A venturi ejector connected to the sulfur phase layer and capable of ejecting hot air is arranged at the bottom of the sulfur phase layer. By ejecting hot bubbles to the sulfur phase, impurities in the sulfur phase are floated to the water phase or the oil phase, thereby improving the refining rate and obtaining refined sulfur. The water phase is filtered to remove impurities and returned to the sulfur slurry stirring tank as a water source. At the same time, in order to maintain the liquid level in the tank, salt water needs to be continuously discharged, and the oil phase is recovered through the overflow of the baffle. Compared with the prior art, the crude sulfur can be refined, and the process is simple and easy to operate while taking into account the economic efficiency, so it is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Schematic diagram of an embodiment of the present invention.
[0019] As shown in the figure: 1. Sulfur slurry stirring tank; 2. Molten sulfur kettle; 3. Refined sulfur kettle; 4. Venturi ejector; 5. Air heater; 6. First jacket; 7. Second jacket; 8. Spray mechanism; 9. Baffle; 10. Feed pump; 11. Circulation pump; 12. Hot water filter; 13. Brine cooler; 14. Liquid sulfur filter; 15. Sulfur slurry level controller; 16. Water phase level controller; 17. Oil phase level controller; 100. Hot water inlet pipeline; 200. Compressed air inlet pipeline; 300. Reflux hot water pipeline; 400. Salt discharge pipeline; 500. Exhaust pipeline; 600. Oil discharge pipeline; 700. Sulfur discharge pipeline; 800. First thermal liquid pipeline; 900. Second thermal liquid pipeline. DETAILED DESCRIPTION
[0020] Example 1
[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0022] like Figure 1 The figure shows a sulfur refining process system, which includes a sulfur slurry stirring tank 1, a sulfur melting kettle 2, a refined sulfur kettle 3, a venturi ejector 4 and an air heater 5, wherein the external pipelines include a hot water inlet pipeline 100, a compressed air inlet pipeline 200, a reflux hot water pipeline 300, a salt discharge pipeline 400, an exhaust pipeline 500, an oil discharge pipeline 600 and a sulfur discharge pipeline 700.
[0023] Among them, the top of the sulfur slurry stirring tank 1 is provided with a crude sulfur inlet and a hot water inlet, and a built-in stirrer. A sulfur slurry level control line is arranged on the sulfur slurry stirring tank 1, and a sulfur slurry level controller 15 is arranged at the corresponding position. The molten sulfur kettle 2 adopts a heating structure in which a heating coil is arranged in the kettle. A first jacket 6 is arranged at the position of the outer wall of the kettle corresponding to the heating coil, and the first jacket 6 is externally connected to a first heat transfer liquid pipeline 800. A second jacket 7 is arranged on the outer wall of the bottom of the refined sulfur kettle 3, and the second jacket 7 is externally connected to a second heat transfer liquid pipeline 900. A spray mechanism 8 is arranged in the refined sulfur kettle 3, and the spray mechanism 8 is located at the bottom of the kettle and sprays upward. A baffle 9 with an L-shaped cross-section is installed on the inner wall of the upper section of the refined sulfur kettle 3 to ensure that after the liquid level in the kettle rises, the upper layer of liquid overflows into the groove formed by the baffle 9 and the inner wall of the refined sulfur kettle 3. A water phase level control line and an oil phase level control line are arranged on the refined sulfur kettle 3, and a water phase level controller 16 and an oil phase level controller 17 are respectively arranged correspondingly.
[0024] The hot water inlet at the top of the sulfur slurry stirring tank 1 is connected to the hot water inlet pipeline 100, and the bottom is connected to the upper part of the molten sulfur kettle 2 through the feed pump 10, the top of the molten sulfur kettle 2 is connected to the middle part of the refined sulfur kettle 3, and the bottom is connected to the bottom of the refined sulfur kettle 3 through the liquid sulfur filter 14.
[0025] The bottom of the refined sulfur kettle 3 is connected to the sulfur discharge pipeline 700, and is connected to the venturi injector 4 through the circulating pump 11. The upper part of the refined sulfur kettle 3 is connected to the oil discharge pipeline 600. The middle part of the refined sulfur kettle 3 is connected to the reflux hot water pipeline 300 and the salt discharge pipeline 400 through the hot water filter 12. The salt discharge pipeline 400 is provided with a brine cooler 13. The reflux hot water pipeline 300 is connected to the hot water inlet pipeline 100. The venturi injector 4 is respectively connected to the spray mechanism 8 and the air heater 5 in the refined sulfur kettle 3. The air heater 5 is connected to the compressed air inlet pipeline 200.
[0026] Control valves with corresponding functions are arranged on the hot water inlet pipeline 100, the compressed air inlet pipeline 200, the return hot water pipeline 300, the salt discharge pipeline 400, the exhaust pipeline 500, the oil discharge pipeline 600 and the sulfur discharge pipeline 700, wherein flow control valves are arranged on the hot water inlet pipeline 100, the compressed air inlet pipeline 200 and the return hot water pipeline 300, liquid level control valves are arranged on the salt discharge pipeline 400 and the oil discharge pipeline 600, a pressure control valve is arranged on the exhaust pipeline 500, a liquid discharge control valve is arranged on the sulfur discharge pipeline 700, a sulfur slurry level controller 15 is connected to the liquid level control valve on the salt discharge pipeline 400 and controls its opening and closing, a water phase liquid level controller 16 is connected to the flow control valve on the return hot water pipeline 300 and controls its opening and closing, and an oil phase liquid level controller 17 is connected to the liquid level control valve on the oil discharge pipeline 600 and controls its opening and closing,
[0027] The working principle of this embodiment is as follows: solid crude sulfur S2 is first mixed with hot water source S1, stirred into slurry under the action of the stirrer in the sulfur slurry stirring tank 1, and enters the molten sulfur kettle 2 under the conveyance of the feed pump 10. It is heated in the molten sulfur kettle 2 and maintained at above 125°C. The slurry is completely converted into a liquid phase, the upper layer is a water phase and an oil phase, and the lower layer is a sulfur phase. The upper water phase enters the middle section of the refined sulfur kettle 3, and the lower layer is first removed from solid impurities by the liquid sulfur filter 14, and then enters the bottom of the refined sulfur kettle 3. In the refined sulfur kettle 3, due to sufficient residence time, the liquid in the refined sulfur kettle 3 is divided into three layers, the upper layer is an oil phase, the middle layer is a water phase, and the lower layer is a sulfur phase. In order to ensure the purity of sulfur in the sulfur phase, the air S3 is sucked and sprayed into microbubbles using the Venturi injection technology, and the impurities in the sulfur phase are floated to the water phase or the oil phase. In order to prevent the sulfur phase from solidifying, the injected air S3 needs to be heated, and the bottom of the refined sulfur kettle 3 needs steam heating and insulation. The refined sulfur S7 at the bottom of the refined sulfur kettle 3 is a sulfur product, which is recovered through a sulfur discharge pipeline 700; the top oil phase is tar S6, which overflows into the groove formed by the baffle 9 and the inner wall of the refined sulfur kettle 3, and is recovered through an oil discharge pipeline 600; the water phase in the middle section is first filtered through a hot water filter 12 to remove impurities, and then mixed with the hot water source S1 in the hot water inlet pipeline 100 through a reflux hot water pipeline 300 to reduce temperature, and then re-enters the sulfur slurry stirring tank 1. At the same time, in order to maintain the liquid level in the sulfur slurry stirring tank 1, it is necessary to continuously discharge brine S4 through a salt discharge pipeline 400. The hot water source S1 enters the sulfur slurry stirring tank 1 from the hot water inlet pipeline 100, the crude sulfur S2 is fed into the sulfur slurry stirring tank 1 from the crude sulfur inlet provided on the top of the sulfur slurry stirring tank 1, the air S3 is heated from the compressed air inlet pipeline 200 through the air heater 5, and is sprayed from the spray mechanism 8 to the bottom sulfur phase of the refined sulfur kettle 3 through the Venturi injector 4, the brine S4 is discharged from the salt discharge pipeline 400, the high-pressure gas S5 in the refined sulfur kettle 3 is discharged from the exhaust pipeline 500, the tar S6 is discharged from the oil discharge pipeline 600, and the refined sulfur S7 is discharged from the sulfur discharge pipeline 700, and the heat transfer liquid S8 required for the first jacket 6 and the second jacket 7 to maintain the temperature in the molten sulfur kettle 2 and the refined sulfur kettle 3 enters each jacket from the first heat transfer liquid pipeline 800 and the second heat transfer liquid pipeline 900 respectively.
[0028] In the preferred embodiment of this example, the mixing ratio of crude sulfur S2 and hot water source S1 is to prepare a slurry of 20-30%wt;
[0029] In the preferred embodiment of this example, the second jacket 7 on the refined sulfur kettle 3 maintains the sulfur phase temperature in the kettle greater than 125°C;
[0030] In the preferred embodiment of this example, the top pressure of the refined sulfur reactor 3 is controlled within the range of 0.3-0.5 MPag;
[0031] In the preferred embodiment of the present invention, the temperature of the gas injected by the Venturi injector 4 is greater than 125°C.
[0032] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
Claims
1. A sulfur refining process system, characterized in that: The invention comprises a sulfur slurry stirring tank (1), a sulfur melting kettle (2), a sulfur refining kettle (3), a venturi ejector (4) and an air heater (5), wherein: A crude sulfur inlet is provided at the top of the sulfur slurry stirring tank (1). The top of the sulfur slurry stirring tank (1) is externally connected to a hot water inlet pipeline (100), and the bottom is connected to the upper section of the molten sulfur kettle (2) through a feed pump (10). The sulfur melting kettle (2) is provided with a heating structure, the top of the sulfur melting kettle (2) is connected to the middle section of the refined sulfur kettle (3), and the bottom is connected to the bottom of the refined sulfur kettle (3) through a liquid sulfur filter (14). A spray mechanism (8) for spraying upward is arranged at the bottom of the refined sulfur kettle (3); the top of the refined sulfur kettle (3) is externally connected to an exhaust pipeline (500); the bottom is externally connected to a sulfur discharge pipeline (700); and at the same time, it is connected to a Venturi ejector (4) through a circulating pump (11); the upper section of the refined sulfur kettle (3) is externally connected to an oil discharge pipeline (600); the middle section of the refined sulfur kettle (3) is respectively connected to a reflux hot water pipeline (300) and a salt discharge pipeline (400) through a hot water filter (12); a brine cooler (13) is arranged on the salt discharge pipeline (400); the reflux hot water pipeline (300) is connected to a hot water inlet pipeline (100); the Venturi ejector (4) is respectively connected to the spray mechanism (8) and the air heater (5) in the refined sulfur kettle (3); the air heater (5) is externally connected to a compressed air inlet pipeline (200); Control valves with corresponding functions are arranged on the hot water inlet pipeline (100), the compressed air inlet pipeline (200), the return hot water pipeline (300), the salt discharge pipeline (400), the exhaust pipeline (500), the oil discharge pipeline (600) and the sulfur discharge pipeline (700).
2. The sulfur refining process system according to claim 1, characterized in that: The sulfur slurry stirring tank (1) is provided with a sulfur slurry level control line and a sulfur slurry level controller (15) is provided at a corresponding position; the refined sulfur kettle (3) is provided with a water phase level control line and an oil phase level control line and a water phase level controller (16) and an oil phase level controller (17) are provided respectively and correspondingly; the sulfur slurry level controller (15) is connected to a control valve on a salt discharge pipeline (400) and controls its opening and closing; the water phase level controller (16) is connected to a control valve on a reflux hot water pipeline (300) and controls its opening and closing; and the oil phase level controller (17) is connected to a control valve on an oil discharge pipeline (600) and controls its opening and closing.
3. The sulfur refining process system according to claim 2, characterized in that: A baffle plate (9) with an L-shaped cross section is installed on the inner wall of the upper section of the refined sulfur kettle (3) to ensure that after the liquid level in the kettle rises, the upper layer of liquid enters the groove formed by the baffle plate (9) and the inner wall of the refined sulfur kettle (3).
4. The sulfur refining process system according to claim 3, characterized in that: The heating structure of the molten sulfur kettle (2) adopts a heating coil structure arranged inside the kettle, a first jacket (6) is arranged at the position of the outer wall of the kettle corresponding to the heating coil, and the first jacket (6) is externally connected to a first heat transfer liquid pipeline (800).
5. The sulfur refining process system according to claim 4, characterized in that: A second jacket (7) is arranged on the outer wall of the bottom of the refined sulfur kettle (3), and the second jacket (7) is externally connected to a second heat transfer liquid pipeline (900).
6. The sulfur refining process system according to claim 5, characterized in that: The second jacket (7) on the refined sulfur kettle (3) maintains the sulfur phase temperature in the kettle to be greater than 125°C.
7. The sulfur refining process system according to claim 6, characterized in that: The top pressure of the refined sulfur kettle (3) is controlled within the range of 0.3-0.5 MPag.
8. The sulfur refining process system according to claim 7, characterized in that: The temperature of the gas injected by the Venturi injector (4) is greater than 125°C.