A purification system for a pyrolysis furnace sulfur injection system

Abstract

This utility model relates to the field of purification technology for sulfur injection systems in pyrolysis furnaces, specifically to a purification system for a sulfur injection system in a pyrolysis furnace. The system includes a dimethyl disulfide injection tank, a temporary injection tank, and a pneumatic pump. The dimethyl disulfide injection tank is connected sequentially to valve one, a filter, a temporary injection tank, a pneumatic pump, and valve two via pipelines, and then reconnected to the dimethyl disulfide injection tank. This allows the liquid in the dimethyl disulfide injection tank to circulate and be filtered through valve one, the filter, the temporary injection tank, the pneumatic pump, and valve two before flowing back into the dimethyl disulfide injection tank. This utility model achieves repeated filtration and circulation of the liquid in the dimethyl disulfide injection tank by connecting valve one, the filter, the temporary injection tank, the pneumatic pump, and valve two sequentially via pipelines, and then reconnecting to the dimethyl disulfide injection tank. This removes impurities from the liquid in the dimethyl disulfide injection tank and ensures the normal operation of the metering pump.

Description

Technical Field

[0001] This utility model relates to the field of purification technology for sulfur injection systems in pyrolysis furnaces, and in particular to a purification system for sulfur injection systems in pyrolysis furnaces. Background Technology

[0002] The existing sulfur injection system uses metering pumps to inject dimethyl disulfide from the sulfur injection tank into the feed line of the cracking furnace. Because the sulfur injection tank is made of carbon steel and it is not possible to empty and clean it during unit production, impurities accumulate at the bottom of the tank, affecting the normal operation of the metering pump. This frequently causes the metering pump to fail to deliver the required amount of product, and has repeatedly caused sudden "temperature runaway" incidents in the separation system reactor. This seriously affects the stable production of the unit and results in a large amount of on-site process adjustments, placing a significant workload on the unit operators. Summary of the Invention

[0003] To address the problem that existing sulfur injection tanks lack emptying capabilities during production, leading to impurity accumulation at the bottom and affecting the normal operation of metering pumps, this invention provides a purification system for the sulfur injection system of a pyrolysis furnace. This system involves connecting a pipe sequentially through a valve, filter, temporary injection tank, pneumatic pump, and valve two to the dimethyl disulfide injection tank, and then reconnecting it to the dimethyl disulfide injection tank. This allows the liquid in the dimethyl disulfide injection tank to be repeatedly filtered and circulated back into the dimethyl disulfide injection tank, achieving multiple circulation and filtration of the liquid within the tank. This removes impurities from the liquid in the dimethyl disulfide injection tank, ensuring the normal operation of the metering pump.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A purification system for a pyrolysis furnace sulfur injection system includes a dimethyl disulfide injection tank, a temporary injection tank, and a pneumatic pump. The dimethyl disulfide injection tank is sequentially connected via pipelines to valve one, a filter, a temporary injection tank, the pneumatic pump, and valve two, and then reconnected to the dimethyl disulfide injection tank. This allows the liquid in the dimethyl disulfide injection tank to circulate and filter through valve one, the filter, the temporary injection tank, the pneumatic pump, and valve two before flowing back into the dimethyl disulfide injection tank. This achieves multiple circulation and filtration of the liquid in the dimethyl disulfide injection tank, removing impurities and ensuring the normal operation of the metering pump.

[0005] Furthermore, a third valve is connected to the pipe between valve one and the filter, and valve three is connected to an oil quality detection port via a pipe. The installation of valve three and the oil quality detection port facilitates observation of the impurity content of the liquid in the dimethyl disulfide injection storage tank after multiple cycles.

[0006] Furthermore, the filter includes a cylinder and a filter screen. A flange sealing structure is fixed to the top of the cylinder, and an inlet is provided on the flange sealing structure. The inlet is connected to a valve via a pipe. The filter screen is disposed inside the cylinder and is fixedly connected to the flange sealing structure. An outlet is provided at the bottom of the cylinder, and the outlet is connected to a temporary injection tank via a pipe. The filter effectively removes impurities from the liquid in the dimethyl disulfide injection storage tank.

[0007] Furthermore, the filter screen includes a perforated plate and a filter screen. There are two perforated plates, which are fitted together internally and externally. The perforated plates are connected to a flange sealing structure. The filter screen is located between the two perforated plates and is fixedly connected to them. The internal perforated plate and filter screen configuration achieve secondary filtration of the liquid; the external perforated plate supports the filter screen and improves its stability.

[0008] Furthermore, the pores of the filter screen are smaller than those of the perforated plate, and a pressure plate is fixed to the bottom of the perforated plate. The pressure plate is fixed to the flange sealing structure by bolts. The smaller pores of the filter screen facilitate secondary filtration. The pressure plate improves the overall stability of the filter screen structure.

[0009] Furthermore, a rubber gasket is fixed between the flange sealing structure and its adjacent perforated plate, and a rubber gasket is fixed between the pressure plate and its adjacent perforated plate. This improves the structural sealing performance and prevents leakage.

[0010] Furthermore, the flange sealing structure includes a flange and a blind flange. The flange is fixed to the top of the cylinder, and a blind flange is fixed to the upper part of the flange. The blind flange has an inlet, which is connected to a valve via a pipe. The combination of the flange and the blind flange improves the sealing performance while facilitating the disassembly of the filter and cleaning of the filter screen.

[0011] Furthermore, a spiral wound gasket is fixed between the flange and the blind flange. This improves the tightness of the connection between the flange and the blind flange and enhances the sealing effect.

[0012] The beneficial effects of this utility model through the above technical solution are: This invention achieves multiple filtrations and circulations of the liquid within the dimethyl disulfide injection tank. These filtrations are sequentially connected via pipes to valve one, a filter, a temporary injection tank, a pneumatic pump, and valve two, before reconnecting to the dimethyl disulfide injection tank. This ensures the liquid in the dimethyl disulfide injection tank is repeatedly filtered and circulated back into the main tank, removing impurities and guaranteeing the normal operation of the metering pump. Furthermore, the use of a perforated plate and filter screen enhances the filtration efficiency through multiple filtration processes. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the purification system of a sulfur injection system for a pyrolysis furnace according to this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the filter in the purification system of a pyrolysis furnace sulfur injection system according to this utility model.

[0015] Figure 3 This utility model relates to a sulfur injection system for a pyrolysis furnace. Figure 2 Enlarged view of point A in the middle.

[0016] The attached diagram is labeled as follows: 1. Dimethyl disulfide injection tank; 2. Valve 1; 3. Filter; 4. Temporary injection tank; 5. Pneumatic pump; 6. Valve 2; 7. Valve 3; 8. Oil quality inspection port; 9. Cylinder; 10. Flange; 11. Blind flange; 12. Inlet; 13. Spiral wound gasket; 14. Perforated plate; 15. Filter screen; 16. Pressure plate; 17. Outlet; 18. Rubber gasket. Detailed Implementation

[0017] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings: like Figures 1-3 As shown, a purification system for a pyrolysis furnace sulfur injection system includes a dimethyl disulfide injection tank 1 and a pneumatic pump 5. The dimethyl disulfide injection tank 1 has an inlet at the top and an outlet at the bottom. The outlet of the dimethyl disulfide injection tank 1 is connected to a valve 2 via a pipe. The valve 2 is connected to a filter 3 via a pipe. The filter 3 is connected to a temporary injection tank 4 via a pipe. The temporary injection tank 4 has an inlet and an outlet. When the temporary injection tank 4 is installed, the inlet of the temporary injection tank 4 is lower than the outlet of the dimethyl disulfide injection tank 1. In this embodiment, the inlet of the temporary injection tank 4 is 50 cm lower than the outlet of the dimethyl disulfide injection tank 1. The inlet of the temporary injection tank 4 is connected to a filter via a pipe, and the outlet of the temporary injection tank 4 is connected to a pneumatic pump 5 via a pipe. The pneumatic pump 5 is connected to valve 6 via a pipe, and valve 6 is connected to the inlet of the dimethyl disulfide injection storage tank 1 via a pipe. In this embodiment, valve 6 is a three-way valve. When it is not necessary to filter impurities in the dimethyl disulfide injection storage tank 1, the interface between valve 6 and pneumatic pump 5 is closed, and nitrogen gas is introduced into the dimethyl disulfide injection storage tank 1 through the other two interfaces of valve 6 to seal it and prevent the liquid odor in the dimethyl disulfide injection storage tank from leaking out.

[0018] To facilitate the detection of impurity content in the liquid within the dimethyl disulfide injection storage tank 1 during repeated tank transfers, a valve 7 is connected to the pipeline between valve 2 and filter 3. Valve 7 is connected to an oil quality detection port 8 via a pipeline. A glass plate level gauge is connected to the dimethyl disulfide injection storage tank 1 for easy observation of liquid level changes within the tank.

[0019] In this embodiment, valve 1 (2), valve 2 (6), and valve 3 (7) are all DN15 gate valves.

[0020] The filter 3 includes a cylindrical body 9 and a filter screen. A flange connection structure is provided at the top of the cylindrical body 9, comprising a flange 10 and a blind flange 11. The flange 10 is fixed to the top of the cylindrical body 9, and the blind flange 11 is bolted to the upper part of the flange 10. To improve the sealing of the connection, a spiral wound gasket 13 is provided between the flange 10 and the blind flange 11. An inlet 12 is provided at the upper part of the blind flange 11, which is connected to valve 2 via a pipe. A filter screen is installed inside the cylindrical body 9, and an outlet 17 is provided at the lower part of the cylindrical body 9, which is connected to a temporary injection tank 4 via a pipe.

[0021] To improve the filtration effect, the filter screen includes a perforated plate 14 and a filter screen 15. Two perforated plates 14 are arranged inside and out, each with an annular cylindrical structure. The filter screen 15 connects the two perforated plates 14, and the pore size of the filter screen 15 is smaller than that of the perforated plate 14. A pressure plate 16 is provided at the lower part of the perforated plate 14 and the filter screen 15. Rubber gaskets 18 are connected between the pressure plate 16 and the perforated plate 14 and the filter screen 15, and between the blind flange 11 and the perforated plate 14 and the filter screen 15. The pressure plate 16 is connected to the blind flange 11 by bolts. In this embodiment, the thickness of the perforated plate 14 is 0.5 mm, and the thickness of the filter screen 15 is 0.1 mm.

[0022] When it is necessary to filter impurities in the dimethyl disulfide injection storage tank 1, open valve 2 to allow the liquid in the dimethyl disulfide injection storage tank 1 to flow into the filter 3 and temporary injection tank 4 through the liquid level difference. The liquid flows through the inlet of the filter 3 into the porous plate 14 and filter screen 15 inside the filter 3 for filtration. The filtered liquid then flows into the temporary injection tank 4 through a pipeline. After the liquid flows into the temporary injection tank 4, open valve 6 and start the pneumatic pump 5. The pneumatic pump 5 draws the filtered liquid from the temporary injection tank 4 through valve 6 into the dimethyl disulfide injection storage tank 1. The liquid level in the dimethyl disulfide injection storage tank 1 is observed in real time through the glass plate level gauge. The process of repeated tank emptying, filtration, and injection is repeated. After multiple cycles, open valve 7, and the operator observes the impurity content in the liquid after multiple cycles through the oil quality detection port 8. When there are no impurities, the circulation can be stopped.

[0023] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A purification system for a sulfur injection system in a pyrolysis furnace, characterized in that, The system includes a dimethyl disulfide injection tank (1), a temporary injection container (4), and a pneumatic pump (5). The dimethyl disulfide injection tank (1) is connected to valve one (2), filter (3), temporary injection container (4), pneumatic pump (5), and valve two (6) in sequence through a pipeline and then reconnected to the dimethyl disulfide injection tank (1). The liquid in the dimethyl disulfide injection tank (1) is circulated and filtered through valve one (2), filter (3), temporary injection container (4), pneumatic pump (5), and valve two (6) and then flows back into the dimethyl disulfide injection tank (1).

2. A purification system of a sulfur injection system of a cracker furnace according to claim 1, characterized in that, Valve 3 (7) is connected to the pipeline between valve 1 (2) and filter (3), and valve 3 (7) is connected to oil quality detection port (8) through the pipeline.

3. The purification system of a sulfur injection system of a cracker furnace according to claim 1, characterized in that, The filter (3) includes a cylinder (9) and a filter screen. A flange sealing structure is fixed on the top of the cylinder (9), and an inlet (12) is opened on the flange sealing structure. The inlet (12) is connected to valve 1 (2) through a pipe. The filter screen is set inside the cylinder (9) and is fixedly connected to the flange sealing structure. An outlet (17) is opened at the bottom of the cylinder (9), and the outlet (17) is connected to the temporary injection tank (4) through a pipe.

4. The purification system of a sulfur injection system of a cracker furnace according to claim 3, characterized in that, The filter screen includes a perforated plate (14) and a filter screen (15). There are two perforated plates (14), which are fitted together. The perforated plates (14) are connected to a flange sealing structure. The filter screen (15) is located between the two perforated plates (14) and is fixedly connected to the two perforated plates (14).

5. A purification system of a sulfur injection system of a cracker furnace according to claim 4, characterized in that, The pores of the filter screen (15) are smaller than those of the perforated plate (14). A pressure plate (16) is fixed to the bottom of the perforated plate (14), and the pressure plate (16) is fixed to the flange sealing structure by bolts.

6. A purification system of a sulfur injection system of a cracker furnace according to claim 5, characterized in that, A rubber gasket (18) is fixed between the flange sealing structure and its adjacent perforated plate (14), and a rubber gasket (18) is fixed between the pressure plate (16) and its adjacent perforated plate (14).

7. A purification system of a sulfur injection system of a cracker furnace according to claim 3, characterized in that, The flange sealing structure includes a flange (10) and a blind flange (11). The flange (10) is fixed to the top of the cylinder (9), and the blind flange (11) is fixed on the upper part of the flange (10). The blind flange (11) has an inlet (12) and the inlet (12) is connected to the valve (2) through a pipe.

8. A purification system of a sulfur injection system of a cracker furnace according to claim 7, characterized in that, A spiral wound gasket (13) is fixed between the flange (10) and the blind flange (11).

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