Sulfur vapor recovery device and sulfur vapor recovery method

Abstract

The invention discloses a sulfur vapor recovery device and a sulfur vapor recovery method. The device comprises a sulfur melting tank, a liquid sulfur recovery device, a temperature regulator, a liquid sulfur recovery tank and a synthesis tower, the sulfur melting tank is respectively connected with the liquid sulfur recovery device and the synthesis tower; one end of the thermolator is connected with the top of the synthesis tower, the other end of the thermolator is connected with the liquid sulfur recovery tank, and the other end of the liquid sulfur recovery tank is connected with the middle of the synthesis tower. And the recovered sulfur steam finally flows back into a reaction or storage device for generating the sulfur steam in a liquid sulfur form, so that the intermediate process is reduced, and the operation stability of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of technology improvement for catalytic synthesis of hydrogen sulfide, and more specifically to a sulfur vapor recovery device and method. Background Technology

[0002] In the catalytic synthesis of hydrogen sulfide, the molten sulfur in the melting tank and synthesis tower vaporizes during operation. The sulfur vapor is discharged through the tail gas pipeline and hydrogen sulfide pipeline, causing blockages and resulting in a decrease in the purity of the hydrogen sulfide product.

[0003] Therefore, how to provide a device and method for recovering sulfur vapor carried in the tail gas and hydrogen sulfide product gas during the catalytic synthesis of hydrogen sulfide is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a sulfur vapor recovery device and method that are flexible and efficient, utilizing water and water vapor to regulate temperature, thereby recovering sulfur vapor carried in tail gas and hydrogen sulfide product gas. This avoids pipeline blockage, improves synthesis efficiency, and ensures product purity.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sulfur vapor recovery device, characterized in that it comprises: a sulfur melting tank, a liquid sulfur recovery device, a temperature controller, a liquid sulfur recovery vessel, and a synthesis tower; The sulfur melting tank is connected to the liquid sulfur recovery device and the synthesis tower, respectively. One end of the temperature controller is connected to the top of the synthesis tower, and the other end is connected to the liquid sulfur recovery tank. The other end of the liquid sulfur recovery tank is connected to the middle of the synthesis tower.

[0006] Preferably, the sulfur melting tank is connected to the liquid sulfur recovery device via a tail gas pipe; The sulfur melting tank is connected to the synthesis tower via a liquid sulfur transport pipeline; The top of the synthesis tower is connected to the temperature controller, and the temperature controller is connected to the liquid sulfur recovery tank via a hydrogen sulfide pipeline. The middle part of the synthesis tower is connected to the liquid sulfur recovery tank via a sulfur return pipe.

[0007] Preferably, the liquid sulfur recovery device has a double-jacketed tube structure, with a lower shell-side inlet on the lower side and an upper shell-side inlet on the upper side. Metal packing is placed in the upper middle part of the tube side. The shell side between the inner and outer tubes can be switched to use either cooling water or steam as the heat exchange medium. When circulating cooling water, water enters from the lower shell-side inlet and exits from the upper shell-side inlet; when switching to steam, steam enters from the upper shell-side inlet and exits from the lower shell-side inlet.

[0008] Preferably, the liquid sulfur recovery tank is provided with a top outlet and a bottom outlet, and a metal wire mesh is provided inside the top outlet.

[0009] Preferably, the liquid sulfur recovery tank has a double-layer jacket structure, in which hydrogen sulfide gas and liquid sulfur are separated in the inner liner, and water vapor is introduced into the jacket between the inner liner and the outer shell for insulation to prevent the separated liquid sulfur from solidifying.

[0010] Preferably, the temperature controller has a shell-and-tube structure, in which the mixture of hydrogen sulfide and sulfur vapor flows through the shell side, and water vapor flows through the tubes.

[0011] Preferably, the wire mesh is made of 316L stainless steel.

[0012] Another object of the present invention is to provide a sulfur vapor recovery method, which uses the above-mentioned sulfur vapor recovery device and specifically includes the following steps: (1) During the melting process of solid sulfur in the sulfur melting tank, tiny mist-like liquid sulfur particles enter the liquid sulfur recovery device along with the tail gas through the tail gas pipe. At this time, circulating cooling water is introduced from the bottom of the shell side and discharged from the top of the shell side. The sulfur vapor carried by the tail gas is cooled as it passes through the metal packing in the tube side, and the sulfur vapor condenses into solid sulfur crystals that adhere to the surface of the metal packing. (2) After the liquid sulfur is recovered, the cooling water is turned off, and water vapor is introduced from the upper end of the shell side and discharged from the lower end of the shell side. The metal packing layer is reheated to 125-135℃, and the sulfur crystals attached to its surface melt to form liquid sulfur. Under the action of gravity, it flows back into the molten sulfur tank. The liquid sulfur is sent to the synthesis tower through the liquid sulfur conveying pipeline to react and produce hydrogen sulfide. (3) The mixture of hydrogen sulfide and sulfur vapor produced by the synthesis tower first enters the shell side of the thermostat and the tube side is vented with external steam to reduce the temperature of the mixture to 180-220℃. After the sulfur vapor is cooled, it forms tiny mist droplets, which then enter the liquid sulfur recovery tank together with the hydrogen sulfide gas. At this time, most of the mist liquid sulfur is separated from the hydrogen sulfide gas. Then, the unseparated liquid sulfur particles are intercepted by the metal wire mesh at the top outlet of the liquid sulfur recovery tank. The liquid sulfur collected in the liquid sulfur recovery tank flows to the bottom of the tank. (4) The bottom outlet of the liquid sulfur recovery tank is connected to the synthesis tower through the sulfur return pipe, and the liquid sulfur eventually flows back to the synthesis tower to participate in the reaction.

[0013] Preferably, the saturated steam pressure used for heat preservation and temperature regulation is selected to be between 280 kPa and 380 kPa.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial effects: 1. The combined use of cooling and packed wire mesh interception methods to recover sulfur vapor results in high recovery efficiency; 2. The recovered sulfur vapor is ultimately returned to the reaction or storage unit that generated the sulfur vapor in the form of liquid sulfur, reducing intermediate processes and improving the stability of the unit operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the device structure provided by the present invention.

[0017] In the diagram, 1-sulfur melting tank, 2-tail gas pipe, 3-liquid sulfur recovery device, 4-liquid sulfur conveying pipeline, 5-hydrogen sulfide pipeline, 6-temperature controller, 7-liquid sulfur recovery tank, 8-sulfur return pipe, 9-synthesis tower, 10-shell side upper opening, 11-shell side lower opening, 12-metal packing, 13-bottom outlet, 14-metal wire mesh, 15-tube set, 16-liquid sulfur recovery device jacket, 17-liquid sulfur recovery tank jacket. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 This embodiment provides a sulfur vapor recovery device, including: a sulfur melting tank 1, a liquid sulfur recovery device 3, a temperature controller 6, a liquid sulfur recovery tank 7, and a synthesis tower 9; The sulfur melting tank 1 is connected to the liquid sulfur recovery device 3 and the synthesis tower 9, respectively; One end of the thermostat 6 is connected to the top of the synthesis tower 9, and the other end is connected to the liquid sulfur recovery tank 7. The other end of the liquid sulfur recovery tank 7 is connected to the middle of the synthesis tower 9.

[0020] Among them, the sulfur melting tank 1 and the liquid sulfur recovery device 3 are connected through the tail gas pipe 2; The sulfur melting tank 1 and the synthesis tower 9 are connected by a liquid sulfur transport pipeline 4; The top of the synthesis tower 9 is connected to the temperature controller 6 and the liquid sulfur recovery tank 7 via a hydrogen sulfide pipeline 5. The middle part of the synthesis tower 9 is connected to the liquid sulfur recovery tank 7 via a sulfur return pipe 8; The liquid sulfur recovery unit 3 has a shell-side lower inlet 11 on one side of the lower part, a shell-side upper inlet 10 on one side of the upper part, and metal packing 12 in the middle and upper part.

[0021] The liquid sulfur recovery tank 7 is equipped with a top outlet and a bottom outlet 13, and a metal wire mesh 14 is installed inside the top outlet; The liquid sulfur recovery device 3 is externally equipped with a liquid sulfur recovery device jacket 16, and the liquid sulfur recovery tank is externally equipped with a liquid sulfur recovery tank jacket 17.

[0022] The thermostat 6 has a shell-and-tube structure.

[0023] Example 2 See Figure 1 This embodiment provides a method for sulfur vapor recovery, including: During the melting process of solid sulfur in the sulfur melting tank 1, tiny mist-like liquid sulfur particles enter the liquid sulfur recovery device 3 along with the tail gas through the tail gas pipe 2. At this time, circulating cooling water is introduced from the shell side lower port 11 and discharged from the shell side upper port 10. The sulfur vapor carried by the tail gas is cooled as it passes through the tube side metal packing 12, and the sulfur vapor condenses into solid sulfur crystals that adhere to the surface of the metal packing 12. After the liquid sulfur is recovered, the cooling water is turned off, and water vapor is introduced from the upper shell port 10 and discharged from the lower shell port 11. The metal packing layer 12 is reheated to around 130°C, and the sulfur crystals attached to its surface melt to form liquid sulfur. Under the action of gravity, it flows back into the molten sulfur tank 1. The liquid sulfur is sent to the synthesis tower 9 through the liquid sulfur conveying pipe 4 to react and produce hydrogen sulfide. Hydrogen sulfide synthesis is an exothermic reaction. The hydrogen sulfide produced in the synthesis tower carries sulfur primarily in the form of sulfur vapor at around 420°C. The mixed gas first enters the shell side of the thermostat 6, while steam is introduced into the tube side to lower the temperature of the mixed gas to approximately 200°C. After cooling, the sulfur vapor forms tiny mist-like droplets. Subsequently, it enters the liquid sulfur recovery tank 7 along with the hydrogen sulfide gas. At this point, due to the increased flow space, the gas velocity decreases, and most of the mist-like liquid sulfur separates from the hydrogen sulfide gas. A small amount of unseparated liquid sulfur particles are then intercepted by the metal wire mesh 14 at the top outlet of the liquid sulfur recovery tank 7. The liquid sulfur collected in the recovery tank 7 flows to the bottom of the tank. Bottom outlet 13 is connected to synthesis tower 9 via sulfur return pipe 8, and liquid sulfur eventually flows back to synthesis tower 9 to participate in the reaction.

[0024] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sulfur vapor recovery device, characterized in that, include: Sulfur melting tank, liquid sulfur recovery unit, temperature controller, liquid sulfur recovery tank and synthesis tower; The sulfur melting tank is connected to the liquid sulfur recovery device and the synthesis tower, respectively. One end of the temperature controller is connected to the top of the synthesis tower, and the other end is connected to the liquid sulfur recovery tank. The other end of the liquid sulfur recovery tank is connected to the middle of the synthesis tower.

2. The sulfur vapor recovery device according to claim 1, characterized in that, The sulfur melting tank is connected to the liquid sulfur recovery device via a tail gas pipe; The sulfur melting tank is connected to the synthesis tower via a liquid sulfur transport pipeline; The top of the synthesis tower is connected to the temperature controller, and the temperature controller is connected to the liquid sulfur recovery tank via a hydrogen sulfide pipeline. The middle part of the synthesis tower is connected to the liquid sulfur recovery tank via a sulfur return pipe.

3. A sulfur vapor recovery device according to claim 2, characterized in that, The liquid sulfur recovery device has a shell-side lower inlet on one side of the lower part, a shell-side upper inlet on one side of the upper part, and metal packing in the middle and upper part.

4. A sulfur vapor recovery device according to claim 3, characterized in that, The liquid sulfur recovery tank is equipped with a top outlet and a bottom outlet, and a metal wire mesh is installed inside the top outlet.

5. A sulfur vapor recovery device according to claim 4, characterized in that, Both the liquid sulfur recovery device and the liquid sulfur recovery tank have a double-layer jacket structure.

6. A sulfur vapor recovery device according to claim 5, characterized in that, The temperature controller has a tube-and-shell structure.

7. A method for recovering sulfur vapor, characterized in that, The sulfur vapor recovery device according to claim 6 specifically includes the following steps: (1) During the melting process of solid sulfur in the sulfur melting tank, tiny mist-like liquid sulfur particles enter the liquid sulfur recovery device along with the tail gas through the tail gas pipe. At this time, circulating cooling water is introduced from the bottom of the shell side and discharged from the top of the shell side. The sulfur vapor carried by the tail gas is cooled as it passes through the metal packing in the tube side, and the sulfur vapor condenses into solid sulfur crystals that adhere to the surface of the metal packing. (2) After the liquid sulfur is recovered, the cooling water is turned off, and water vapor is introduced from the upper end of the shell side and discharged from the lower end of the shell side. The metal packing layer is reheated to 125-135℃, and the sulfur crystals attached to its surface melt to form liquid sulfur. Under the action of gravity, it flows back into the molten sulfur tank. The liquid sulfur is sent to the synthesis tower through the liquid sulfur conveying pipeline to react and produce hydrogen sulfide. (3) The mixture of hydrogen sulfide and sulfur vapor produced by the synthesis tower first enters the shell side of the thermostat and the tube side is vented with external steam to reduce the temperature of the mixture to 180-220℃. After the sulfur vapor is cooled, it forms tiny mist droplets, which then enter the liquid sulfur recovery tank together with the hydrogen sulfide gas. At this time, most of the mist liquid sulfur is separated from the hydrogen sulfide gas. Then, the unseparated liquid sulfur particles are intercepted by the metal wire mesh at the top outlet of the liquid sulfur recovery tank. The liquid sulfur collected in the liquid sulfur recovery tank flows to the bottom of the tank. The bottom outlet of the liquid sulfur recovery tank is connected to the synthesis tower via a sulfur return pipe, and the liquid sulfur eventually flows back to the synthesis tower to participate in the reaction.

Images