A closed sulfur fume collection system and process

Abstract

The present application relates to coke oven gas purification desulfurization and dehydrocyanation technical field, especially to a kind of closed molten sulfur collection system and process.It includes multiple molten sulfur kettles (1) connected in parallel by pipeline, also includes multiple buffer tanks (3), multiple inclined pipes (7) and a sulfur receiving disc (10);Each molten sulfur kettle (1) is connected with respective buffer tank (3) by pipeline, buffer tank (3) is connected with one end of inclined pipe (7) by pipeline;The other end of multiple inclined pipes (7) is merged into a main pipe, and the main pipe is connected with the sulfur receiving disc (10).Sulfur collection after molten sulfur kettle is completely closed, effectively avoid toxic waste gas, sulfur dust and molten sulfur splashing to bring harm to workers;At the same time, sulfur collection process can realize unmanned operation on site, save labor cost.

Description

TECHNICAL FIELD

[0001] The present application relates to coke oven gas purification desulfurization and dehydrocyanation technical field, especially to a closed sulfur melting collection system and process. BACKGROUND

[0002] The sulfur melting kettle is very common in the wet desulfurization process, which integrates sulfur separation, melting and recovery, and has the advantages of simple structure, easy operation and large processing flexibility.

[0003] However, during the discharge process of the sulfur melting kettle, a large amount of toxic waste gas (sulfur-containing acid gas) and high-temperature sulfur splashing are accompanied, and the existence and diffusion of these harmful substances make the production environment bad and cause great harm to the health of workers. It does not meet the requirements of contemporary environmental protection and occupational health management, and is a problem that needs to be solved at present.

[0004] In addition, the sulfur melting kettle is generally operated in parallel, and an sulfur receiving disc is arranged under each sulfur melting kettle. The discharge of each sulfur melting kettle needs to be observed and operated by workers on site, which greatly wastes human resources. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the present application provides a closed sulfur melting collection system and process, which completely closes the sulfur collection after the sulfur melting kettle, effectively avoids the harm of toxic waste gas, sulfur dust and molten sulfur splashing to workers, and realizes unmanned operation on site during the sulfur collection process, saving labor cost.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A closed sulfur melting collection system, comprising a plurality of sulfur melting kettles (1) connected in parallel through pipelines, a plurality of buffer tanks (3), a plurality of inclined pipes (7) and a sulfur receiving disc (10); each sulfur melting kettle (1) is connected with a respective buffer tank (3) through a pipeline, and the buffer tank (3) is connected with one end of the inclined pipe (7) through a pipeline; the other end of the plurality of inclined pipes (7) is connected with a header pipe, and the header pipe is connected with the sulfur receiving disc (10).

[0008] Further, the buffer tank (3) is provided with an adjusting valve (5) and a pressure gauge (6), and the pressure in the buffer tank (3) is adjusted by the adjusting valve (5) and the pressure gauge (6).

[0009] Further, the buffer tank (3) is provided with a baffle (31).

[0010] Further, the buffer tank (3) is conical.

[0011] Further, the buffer tank (3) is connected with a compressed air pipeline, and a preheater (12) is arranged on the compressed air pipeline.

[0012] Further, the buffer tank (3) and the inclined pipe (7) are provided with a steam jacket.

[0013] Further, the main pipe is located in the middle of the plurality of inclined pipes (7), and the plurality of inclined pipes (7) are inclined downward towards the middle.

[0014] Further, an exhaust hood (9) is arranged above the sulfur receiving disc (10), an air inlet is arranged at the top of the exhaust hood (9), and the air inlet is connected with a pipeline of a desulfurization tail gas washing system.

[0015] Further, an electric valve (2) for entering the buffer tank is arranged on the pipeline connecting the sulfur melting pot (1) and the buffer tank (3), an electric valve (4) for discharging the buffer tank is arranged on the pipeline connecting the buffer tank (3) and the inclined pipe (7), an electric valve (8) for the outlet of the inclined pipe is arranged at the end of the main pipe, and a compressed air valve (11) is arranged on the compressed air pipeline connected with the buffer tank (3); the electric valve (2) for entering the buffer tank, the electric valve (4) for discharging the buffer tank, the electric valve (8) for the outlet of the inclined pipe, and the compressed air valve (11) can be remotely operated by DCS, and the electric valve (2) for entering the buffer tank can adjust the opening degree.

[0016] A closed sulfur melting and collecting process, specifically comprising:

[0017] 1) When any one of the plurality of parallel operating sulfur melting pots (1) needs to be discharged, first open the electric valve (2) for entering the buffer tank, the electric valve (4) for discharging the buffer tank, and the electric valve (8) for the outlet of the inclined pipe under the sulfur melting pot (1) in the central control room at the same time;

[0018] 2) Adjust the opening degree of the electric valve (2) for entering the buffer tank under the sulfur melting pot (1) to control the discharge speed, and the molten sulfur (~130℃, ~0.35MPa) is discharged to the baffle (31) of the buffer tank (3) through the electric valve (2) for entering the buffer tank under the sulfur melting pot (1);

[0019] 3) The exhaust gas generated by the high-temperature sulfur discharge makes the pressure of the pressure gauge (6) on the buffer tank (3) rapidly rise, at this time, the regulating valve (5) at the top of the buffer tank (3) acts to continuously reduce the pressure, the generated exhaust gas is discharged to the desulfurization tail gas washing system, and the pressure in the buffer tank (3) is maintained at ~0.02MPa;

[0020] 4) As the amount of sulfur discharge decreases, the pressure of the pressure gauge (6) gradually decreases, and when the pressure decreases to normal pressure, it indicates that the sulfur discharge is complete;

[0021] 5) Sulfur slowly flows into the inclined pipe (7), liquid sulfur is transported to the sulfur receiving disc (10) at the end through the inclined pipe (7); the exhaust hood (9) is arranged above the sulfur receiving disc (10), and the air inlet is arranged at the top of the exhaust hood (9), and waste gas and sulfur dust are discharged to a desulfurization tail gas washing system;

[0022] 6) After the sulfur receiving is completed, all the valves above are closed;

[0023] 7) After the sulfur is naturally cooled, the sulfur in the sulfur receiving disc (10) is transported to a sulfur transfer room.

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] 1) The discharge port at the bottom of the sulfur melting pot (1) is connected with the buffer tank (3), the inclined pipe (7) and the sulfur receiving disc (10) in sequence, an adjusting valve is arranged on the buffer tank (3), and the pressure in the tank can be controlled. The bottom of the buffer tank (3) is a conical structure, a baffle (31) is arranged in the buffer tank (3), and a compressed air connecting pipe is arranged above the baffle (31), which is beneficial to the complete discharge of liquid flow. The buffer tank (3) and the inclined pipe (7) are provided with steam jackets, so that the liquid sulfur is not quickly cooled and adhered to the inner wall of the equipment. The exhaust hood (9) is arranged above the sulfur receiving disc (10), and the air inlet is arranged at the top of the exhaust hood (9), and waste gas and sulfur dust are discharged to a desulfurization tail gas washing system.

[0026] The whole process from discharging from the sulfur melting pot (1) to sulfur cooling is in a closed environment, waste gas and sulfur dust are recycled, there is no pollution discharge, the poor environment of sulfur discharge on site is improved, and the environmental protection requirement is met.

[0027] 2) The pipeline connected with the buffer tank (3) of the sulfur melting pot (1) is provided with an inlet buffer tank electric valve (2), the pipeline connected with the inclined pipe (7) of the buffer tank (3) is provided with an outlet buffer tank electric valve (4), the end of the main pipe is provided with an inclined pipe outlet electric valve (8), and the compressed air pipeline connected with the buffer tank (3) is provided with a compressed air valve (11); the inlet buffer tank electric valve (2), the outlet buffer tank electric valve (4), the inclined pipe outlet electric valve (8) and the compressed air valve (11) can be remotely operated by DCS, and the inlet buffer tank electric valve (2) can adjust the opening degree.

[0028] In addition to the regular sulfur transfer of the staff, the present application realizes remote control, saves the procedures of on-site operation of the valve and observation of sulfur discharge of the staff, greatly saves the labor cost, and further improves the work efficiency by combining multiple small sulfur receiving discs.

[0029] 3) The present application has the advantages of simple process, reasonable structure, flexible operation, easy maintenance and being beneficial to transformation. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1It is the structural schematic and process principle diagram of the present application.

[0031] In the figure: 1- molten sulfur still 2- into the buffer tank electric valve 3- buffer tank 31- baffle 4- out of the buffer tank electric valve 5- regulating valve 6- pressure gauge 7- inclined pipe 8- inclined pipe outlet electric valve 9- exhaust hood 10- sulfur receiving disc 11- compressed air valve 12- preheater DETAILED DESCRIPTION

[0032] The embodiments of the present application will be further described below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0033] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035]

EXAMPLE

[0036] As Figure 1 shown, a closed molten sulfur collecting system includes two molten sulfur stills (1) connected in parallel through pipes, and further includes two buffer tanks (3), two inclined pipes (7) and a sulfur receiving disc (10).

[0037] The two molten sulfur stills (1) are respectively connected to the two buffer tanks (3) through pipes, and the buffer tanks (3) are connected to one end of the inclined pipes (7) through pipes. The other ends of the two inclined pipes (7) are connected to a total pipe, and the total pipe is connected to the sulfur receiving disc (10).

[0038] As a further improvement of the present application, the buffer tank (3) is provided with a regulating valve (5) and a pressure gauge (6). The pressure in the buffer tank (3) needs to be maintained at a slight positive pressure (~0.02 MPa) through the regulating valve (5) and the pressure gauge (6). The appropriate pressure is conducive to the smooth discharge of sulfur to the inclined pipe (7).

[0039] As a further improvement of the present application, the buffer tank (3) is provided with a baffle (31), which further plays a buffering role.

[0040] As a further improvement of the present application, the buffer tank (3) is provided with a conical bottom, which is more conducive to the discharge of liquid sulfur.

[0041] As a further improvement of the present application, compressed air is designed to be blown on the buffer tank (3). The compressed air needs to be heated by a preheater (12) before use, which reduces the residue of liquid sulfur in the pipeline and equipment.

[0042] As a further improvement of the present application, the inclined pipe (7) should be inclined downward from the middle to the lower part of the two ends of the sulfur melting pot (1), which is more conducive to the flow of liquid sulfur.

[0043] As a further improvement of the present application, an exhaust hood (9) is arranged above the sulfur receiving disc (10), and an air inlet is arranged at the top of the exhaust hood (9) to discharge waste gas and sulfur dust to a desulfurization tail gas washing system.

[0044] As a further improvement of the present application, an electric valve (2) for entering the buffer tank is arranged on the pipeline connecting the sulfur melting pot (1) and the buffer tank (3). An electric valve (4) for exiting the buffer tank is arranged on the pipeline connecting the buffer tank (3) and the inclined pipe (7). An electric valve (8) for the outlet of the inclined pipe is arranged at the end of the main pipe. A compressed air valve (11) is arranged on the compressed air pipeline connected with the buffer tank (3). The electric valves (2), (4), (8), and (11) can be remotely operated by DCS, and the electric valve (2) for entering the buffer tank can adjust the opening degree.

[0045] A closed sulfur melting collection process, specifically comprising:

[0046] When any one of the plurality of parallel operating sulfur melting pots (1) needs to be discharged, the electric valves (2), (4), and (8) for entering and exiting the buffer tank and the outlet of the inclined pipe are opened simultaneously in the central control room.

[0047] The opening of the electric valve (2) at the bottom of the molten sulfur pot (1) can be adjusted to control the discharge speed. The molten sulfur (about 130℃, about 0.35MPa) is discharged from the electric valve (2) at the bottom of the molten sulfur pot (1) to the baffle (31) of the buffer tank (3). The exhaust gas generated by the discharge of the high-temperature sulfur makes the pressure of the buffer tank (3) rapidly increase. At this time, the adjusting valve (5) at the top of the buffer tank (3) operates to continuously reduce the pressure, discharges the generated exhaust gas to the desulfurization tail gas washing system, and maintains the pressure in the buffer tank (3) at about 0.02MPa. As the amount of sulfur discharged decreases, the pressure of the pressure gauge (6) gradually decreases. When the pressure drops to normal pressure, it indicates that the sulfur discharge is complete.

[0048] The sulfur slowly flows into the inclined pipe (7). The inclined pipe (7) is inclined downward from the middle to the lower part from both ends of the molten sulfur pot. This not only saves space, but also facilitates the flow of liquid sulfur. The inclination should generally be greater than 5%. The liquid sulfur is transported through the inclined pipe to the sulfur receiving disc (10) at the end. In order to avoid the pollution of the surrounding environment by the exhaust gas and sulfur dust during the sulfur receiving process, an exhaust hood (9) is provided above the sulfur receiving disc (10). An air inlet is provided at the top of the exhaust hood (9) to discharge the exhaust gas and sulfur dust to the desulfurization tail gas washing system.

[0049] After the sulfur receiving is completed, all the above valves need to be closed.

[0050] After the sulfur cools naturally, the workers periodically transport the sulfur in the sulfur receiving disc (10) to the sulfur transfer room. An access door is provided on the exhaust hood (9) for workers to transport the sulfur.

[0051] The exhaust hood (9) is directly placed on the indoor floor with a small gap between the exhaust hood (9) and the floor. There is also a small gap around the access door. This can ensure that the exhaust gas and dust in the exhaust hood (9) do not spread, and also ensures that the exhaust hood (9) is not damaged by the suction of the negative pressure fan. The system can be considered completely sealed.

[0052] The sulfur pressure at the outlet of the molten sulfur pot (1) is relatively high. Direct discharge to the inclined pipe (7) may cause abnormal noise and pipe deformation. The purpose of setting the buffer tank (3) and the adjusting valve (5) is to reduce the pressure. The baffle (31) in the buffer tank (3) further plays a buffering role to avoid liquid sulfur directly spraying and blocking the equipment pipe. Maintaining a small pressure (about 0.02MPa) in the buffer tank (3) is more conducive to the smooth transportation of liquid sulfur to the inclined pipe (7), and does not cause damage to the equipment and pipes.

[0053] The buffer tank (3) is provided with a conical bottom, which is more conducive to the discharge of liquid sulfur.

[0054] Buffer tank (3) baffle (31) above design compressed air purge, clean up after sulfur, reduce the residual liquid sulfur in the pipeline and equipment. Compressed air needs to be preheated before use, to avoid the impact of liquid sulfur cooling flow. The specific implementation is as follows: open the compressed air valve (11), use the compressed air preheated to 130 DEG C by the preheater (12) to purge, flush the residual sulfur on the baffle (31) of the buffer tank (3).

[0055] Buffer tank (3), inclined pipe (7) outside and the associated pipeline are provided with a jacket, and steam heating is passed, to avoid the liquid sulfur sticking to the inner wall of the equipment and pipeline due to rapid cooling during transportation.

[0056] A plurality of parallel operation of the sulfur melting kettle (1) outlet is provided with steam purge as an auxiliary for daily maintenance.

[0057] The closed sulfur melting collection process has the following advantages:

[0058] 1, in addition to the staff regularly pour sulfur, the present application realizes remote control, saves the staff on-site control valve, observation of sulfur discharge and other procedures, greatly saves the labor cost, in addition to the merger of multiple small sulfur receiving disc, further improves the work efficiency.

[0059] 2, the present application from the sulfur melting kettle (1) discharge to the whole process of sulfur cooling, are closed environment, while the waste gas and sulfur dust recovery, no pollution emission, improve the site sulfur discharge of the harsh environment, meet the environmental protection requirements.

[0060] 3, the present application process is simple, reasonable structure, flexible operation, easy to maintain, and conducive to the transformation.

[0061] The above described, only for the preferred embodiment of the present application, but the scope of protection of the present application is not limited to this, any skilled in the art of the technical personnel in the technical range disclosed by the present application, according to the technical scheme of the present application and the invention concept of the invention, equivalent replacement or change, should be covered in the scope of protection of the present application.

Claims

1. A closed-loop sulfur melting and collection system, comprising multiple sulfur melting kettles (1) connected in parallel via pipelines, characterized in that, It also includes multiple buffer tanks (3), multiple inclined pipes (7) and a sulfur receiving plate (10); each of the sulfur melting kettles (1) is connected to its respective buffer tank (3) through a pipe, and the buffer tank (3) is connected to one end of the inclined pipe (7) through a pipe; the other ends of the multiple inclined pipes (7) converge into the main pipe, and the main pipe is connected to the sulfur receiving plate (10); The buffer tank (3) is equipped with a regulating valve (5) and a pressure gauge (6), and the pressure inside the buffer tank (3) is adjusted by regulating the regulating valve (5) and the pressure gauge (6); The buffer groove (3) is provided with a baffle (31).

2. The closed-loop molten sulfur collection system according to claim 1, characterized in that, The buffer groove (3) has a conical bottom.

3. The closed-loop molten sulfur collection system according to claim 1, characterized in that, The buffer tank (3) is connected to the compressed air pipeline, and the compressed air pipeline is equipped with a preheater (12).

4. A closed-loop molten sulfur collection system according to claim 1, characterized in that, The buffer tank (3) and the inclined pipe (7) are equipped with steam jackets.

5. A closed-loop molten sulfur collection system according to claim 1, characterized in that, The main pipe is located in the middle of multiple inclined pipes (7), which are inclined downwards towards the middle.

6. A closed-loop molten sulfur collection system according to claim 1, characterized in that, An exhaust hood (9) is provided above the sulfur receiving plate (10), and an air inlet is provided on the top of the exhaust hood (9). The air inlet is connected to the pipeline of the desulfurization tail gas scrubbing system.

7. A closed-loop molten sulfur collection system according to claim 1, characterized in that, The pipe connecting the sulfur melting kettle (1) and the buffer tank (3) is equipped with an electric valve (2) for entering the buffer tank, an electric valve (4) for exiting the buffer tank is equipped on the pipe connecting the buffer tank (3) and the inclined pipe (7), an electric valve (8) for exiting the inclined pipe is equipped at the end of the main pipe, and a compressed air valve (11) is equipped on the compressed air pipe connected to the buffer tank (3). The electric valve (2) for entering the buffer tank, the electric valve (4) for exiting the buffer tank, the electric valve (8) for exiting the inclined pipe, and the compressed air valve (11) can be operated remotely by DCS, and the electric valve (2) for entering the buffer tank can adjust the opening degree.

8. A closed-loop molten sulfur collection process based on the closed-loop molten sulfur collection system according to any one of claims 1 to 7, characterized in that, Specifically, it includes: 1) When any of the multiple sulfur melting kettles (1) operating in parallel needs to perform sulfur discharge operation, firstly open the electric valve (2) for entering the buffer tank, the electric valve (4) for exiting the buffer tank, and the electric valve (8) for the inclined pipe outlet below the sulfur melting kettle (1) in the central control room. 2) Adjust the opening of the electric valve (2) below the sulfur melting kettle (1) to control the discharge speed. Molten sulfur is discharged through the electric valve (2) below the sulfur melting kettle (1) onto the baffle (31) of the buffer tank (3). 3) The exhaust gas generated by the high temperature sulfur emission causes the pressure gauge (6) on the buffer tank (3) to rise rapidly. At this time, the regulating valve (5) at the top of the buffer tank (3) is activated to continuously reduce the pressure and discharge the generated exhaust gas to the desulfurization tail gas washing system, and maintain the pressure level in the buffer tank (3) at 0.02±0.005MPa. 4) As the amount of sulfur emissions decreases, the pressure gauge (6) gradually decreases. When the pressure drops to normal pressure, it indicates that the sulfur emissions have been completed. 5) The sulfur slowly flows into the inclined pipe (7), and the liquid sulfur is transported through the inclined pipe (7) to the sulfur receiving plate (10) at the end; an exhaust hood (9) is set above the sulfur receiving plate (10), and an air inlet is set at the top of the exhaust hood (9) to discharge the waste gas and sulfur dust to the desulfurization tail gas washing system. 6) Once sulfur infusion is complete, close all the above valves; 7) After the sulfur has cooled naturally, the sulfur in the sulfur receiving tray (10) is transported to the sulfur transfer room.

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