Asphalt emptying system

Abstract

The utility model relates to an asphalt emptying system which comprises an underground emptying groove, an asphalt storage groove, a nitrogen pipeline, a breathing pipeline and an asphalt emptying header pipe, the nitrogen pipeline, the breathing pipeline and the asphalt emptying header pipe are arranged on the upper portion of the underground emptying groove, an extrusion pipeline is arranged on the lower portion of the underground emptying groove, and the other end of the extrusion pipeline is connected with the asphalt storage groove. The nitrogen pipeline, the breathing pipeline, the asphalt emptying header pipe and the extrusion pipeline are all provided with electromagnetic valves, all the electromagnetic valves are connected with a liquid level recording interlocking alarm instrument and a pressure recording control instrument, and a gas sealing bottom valve is arranged at the connecting position of the extrusion pipeline and the underground emptying groove. The maintenance time is shortened, the workload of operators is reduced, a large amount of investment, operation cost, operation cost and maintenance cost are saved, operation is simplified, maintenance is very convenient, nitrogen serving as back pressure is prevented from being discharged, and the safety of the system is improved.

Description

Technical Field

[0001] This utility model relates to the field of asphalt production technology in the coking industry, and in particular to an asphalt venting system. Background Technology

[0002] Coal tar processing typically produces about 50% to 60% medium-temperature pitch, which is a major product of coal tar processing. Modified pitch is currently the main downstream product of medium-temperature pitch, mainly used in the electrolytic aluminum industry to produce prebaked anodes and to prepare battery rods or electrode binders.

[0003] Domestically produced medium-temperature asphalt and modified asphalt products are stored in asphalt warehouses. Whether it is asphalt production or storage, underground asphalt venting tanks are rarely set up. Asphalt pipelines are handled by manually blowing liquid asphalt back to the asphalt storage tanks. This is because even if underground asphalt venting tanks are set up and equipped with asphalt submersible pumps, the pumps quickly become stuck due to intermittent operation. If screw pumps are selected, they need to be purged after each operation for the next use, which is very cumbersome and cannot be automated.

[0004] Although underground asphalt venting tanks are rarely installed, they are essential for operational purposes. Venting asphalt pipelines into underground venting tanks is very convenient, and there is no need to worry about overpressure in the underground venting tanks because they are pressure-resistant. However, when purging back into the asphalt storage tank, which is not pressure-resistant, extreme caution must be exercised to prevent overpressure rupture accidents.

[0005] Could nitrogen be used as back pressure to push the liquid asphalt vented from the underground venting tank back into the asphalt storage tank? Theoretically, it is possible. However, in the process of pushing the liquid asphalt back into the asphalt storage tank, there is also a risk of sending a large amount of high-pressure nitrogen into the asphalt storage tank, and the speed is faster, making the safety issues difficult to resolve.

[0006] In summary, the urgent issues to be addressed when setting up underground asphalt venting trenches are ease of operation and safety; complex maintenance and simple operation are sufficient. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, this utility model provides an asphalt venting system that uses nitrogen as back pressure. High-pressure nitrogen is introduced to force the liquid asphalt vented from the underground venting tank back into the asphalt storage tank. A sealing bottom valve is installed between the asphalt discharge pipeline and the underground venting tank. The function of this sealing bottom valve is to automatically close when the liquid asphalt is about to be discharged, thereby improving system safety. The entire system is simple to operate, highly practical, can achieve automated operation, is safe to run, simple to maintain, and has high economic value.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An asphalt venting system includes an underground venting tank, an asphalt storage tank, a nitrogen pipeline, a breather pipeline, and an asphalt venting main pipe. The nitrogen pipeline, breather pipeline, and asphalt venting main pipe are installed at the upper part of the underground venting tank, with the other end of the breather pipeline connected to a gas dissipation main pipe. A discharge pipeline is installed at the lower part of the underground venting tank, with the other end of the discharge pipeline connected to the asphalt storage tank. All the nitrogen pipeline, breather pipeline, asphalt venting main pipe, and discharge pipeline are equipped with solenoid valves. All solenoid valves are connected to a liquid level recording interlock alarm instrument and a pressure recording control instrument. A sealing bottom valve is installed at the connection point between the discharge pipeline and the underground venting tank.

[0010] Furthermore, the asphalt venting system also includes a circulation pipeline and a bypass pipeline. One end of the circulation pipeline is connected to the outlet end of the solenoid valve on the discharge pipeline, and the other end is connected to the underground venting tank. A gate valve is installed on the circulation pipeline. The bypass pipeline is connected in parallel with the breathing pipeline between the underground venting tank and the main venting pipe.

[0011] Furthermore, a throttling orifice plate is provided at the outlet end of the solenoid valve on the breathing pipeline.

[0012] Furthermore, a solenoid valve is installed on the bypass pipeline, and the solenoid valve on the bypass pipeline is connected to a liquid level recording interlock alarm instrument and a pressure recording control instrument.

[0013] Furthermore, a gate valve 2 is installed on the discharge pipeline.

[0014] Furthermore, the aforementioned air-sealing bottom valve includes a valve core and a valve seat. The valve core is a steel pipe with a strip-shaped hole on its side wall and a float at the top. The valve seat is a steel pipe with a flange at the bottom, and the flange connects to the press-out pipeline. A restraining bolt is installed on the side wall of the valve seat steel pipe. The valve core steel pipe is inserted into the valve seat steel pipe, and the valve core float rests on the upper end of the top opening of the valve seat steel pipe. The restraining bolt is fitted into the strip-shaped hole.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) Using nitrogen as back pressure, high-pressure nitrogen is introduced to push the liquid asphalt vented from the underground venting tank back into the asphalt storage tank, eliminating the need for a liquid asphalt delivery pump. The discharge pipeline is less prone to blockage, reducing maintenance time, reducing the workload of operators, saving a lot of investment, operating costs, and maintenance costs, simplifying operation, and making maintenance very convenient.

[0017] 2) A sealing valve is installed between the liquid asphalt extrusion pipeline and the underground venting tank. The function of this sealing valve is to automatically close when the liquid asphalt is about to be discharged, to prevent nitrogen as back pressure from being discharged into the asphalt storage tank, which could cause the asphalt storage tank to rupture due to overpressure. This improves the safety of the system, increases the efficiency of the system, and reduces the safety hazards to equipment and surrounding personnel during the liquid asphalt extrusion operation.

[0018] 3) The use of level recording interlock alarm instruments and pressure recording control instruments enables automated operation, improves system efficiency, and enhances system mobility and flexibility. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an asphalt venting system according to the present invention.

[0020] Figure 2 This is a schematic diagram of the connection structure between the underground venting trough and the sealing bottom valve described in this utility model.

[0021] Figure 3 This is the sealing bottom valve structure described in this utility model.

[0022] Figure 4 This is a schematic diagram of the valve core structure described in this utility model.

[0023] Figure 5 This is a schematic diagram of the valve seat structure described in this utility model.

[0024] In the diagram: 1. Underground venting tank; 2. Asphalt storage tank; 3. Sealing bottom valve; 4. Solenoid valve 1; 5. Solenoid valve 2; 6. Solenoid valve 3; 7. Solenoid valve 4; 8. Solenoid valve 5; 9. Gate valve 1; 10. Gate valve 2; 11. Orifice plate; 12. Equipment interface, flange, and blind flange; 13. Discharge pipeline; 14. Nitrogen pipeline; 15. Breathing pipeline; 16. Bypass pipeline; 17. Asphalt venting main pipe; 18. Circulation pipeline; 19. Discharge main pipe; 20. Valve core; 21. Valve seat; 22. Buoy; 23. Flange; 24. Restraint bolt; 25. Nitrogen purging; LRSA01. Level recording interlock alarm instrument; PRC01. Pressure recording control instrument; H. High limit; L. Low limit. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0026] like Figures 1-5As shown, an asphalt venting system includes an underground venting tank 1, an asphalt storage tank 2, a nitrogen pipeline 14, a breather pipeline 15, and an asphalt venting main pipe 17. The underground venting tank 1 is equipped with the nitrogen pipeline 14, the breather pipeline 15, and the asphalt venting main pipe 17 at its upper part. The breather pipeline 15 connects the underground venting tank 1 to the venting main pipe 19. The lower part of the underground venting tank 1 is equipped with a discharge pipeline 13, the other end of which is connected to the asphalt storage tank 2. The nitrogen pipeline 14 is equipped with a first solenoid valve 4, the breather pipeline 15 is equipped with a second solenoid valve 5, and the asphalt venting main pipe 17 is equipped with… Solenoid valve 7 is installed on the discharge pipeline 13, and solenoid valve 8 is installed on the discharge pipeline 13. All solenoid valves are connected to the liquid level recording interlock alarm instrument LRSA01 and the pressure recording control instrument PRC01. A sealing bottom valve 3 is installed at the connection position between the discharge pipeline 13 and the underground venting tank 1. The lower part of the underground venting tank 1 is equipped with an equipment interface, flange and blind plate 12. The flange of the equipment interface is sealed with a blind plate with an opening. The steel pipe of the valve seat 21 is inserted into the equipment interface and welded to the blind plate. After the underground venting tank 1 is emptied of liquid, the sealing bottom valve 3 can automatically close to prevent the nitrogen gas as back pressure from being discharged.

[0027] Furthermore, the asphalt venting system also includes a circulation pipeline 18 and a bypass pipeline 16. One end of the circulation pipeline 18 is connected to the outlet of solenoid valve 8 on the discharge pipeline 13, and the other end is connected to the underground venting tank 1. A gate valve 9 is installed on the circulation pipeline 18. When the liquid level recording interlock alarm instrument LRSA01 shows a low limit, the interlock controls the solenoid valve 8 on the discharge pipeline 13 to close, and the underground venting tank 1 no longer supplies asphalt to the asphalt storage tank 2. At this time, the gate valve 10 on the discharge pipeline 13 is closed, and the gate valve 9 on the circulation pipeline 18 is opened. Nitrogen purging 25 is connected to the discharge pipeline 13, and the residual asphalt in the discharge pipeline 13 will be sent back to the underground venting tank 1 through the circulation pipeline 18. The bypass pipeline 16 is connected to the breathing pipeline 1. 5. A parallel connection is set between the underground venting tank 1 and the main gas distribution pipe 19. The bypass line 16 can quickly vent gas, keeping the underground venting tank 1 at normal pressure. Both the bypass line 16 and the breathing line 15 are connected to the underground venting tank 1 and the main gas distribution pipe 19. When the solenoid valve 2 5 on the breathing line 15 is opened, the solenoid valve 3 6 on the bypass line 16 is closed. The nitrogen in the underground venting tank 1 enters the main gas distribution pipe 19 at a very small flow rate to prevent nitrogen expansion from causing safety hazards to the system. When the system pressure drops to 50 kPa, the solenoid valve 2 5 is closed and the solenoid valve 3 6 is opened, opening the bypass line 16 to transport the nitrogen in the underground venting tank to the main gas distribution pipe 19. The bypass line 16 does not have a throttling orifice plate 11, which speeds up the delivery speed and improves the system's working efficiency.

[0028] Furthermore, a throttling orifice plate 11 is provided at the outlet end of the solenoid valve 2 5 on the breathing line 15. The throttling orifice plate 11 controls the nitrogen flow rate in the breathing line 15, so that the nitrogen in the breathing line 15 returns to the main gas distribution pipe 19 at a small flow rate.

[0029] Furthermore, a solenoid valve 6 is installed on the bypass pipeline 16. The solenoid valve 6 on the bypass pipeline 16 is connected to the liquid level recording interlock alarm instrument LRSA01 and the pressure recording control instrument PRC01. When the pressure in front of the valve decreases to 50kPa, the solenoid valve 5 is closed and the solenoid valve 6 on the bypass pipeline 16 is opened to accelerate the delivery of nitrogen in the underground venting tank 1 to the main gas distribution pipe 19.

[0030] Furthermore, a gate valve 2 10 is installed on the discharge pipeline 13. The gate valve 2 10 is closed when the residual asphalt in the discharge pipeline 13 is purged to prevent the nitrogen gas used for purging from entering the asphalt storage tank 2, thereby improving system safety.

[0031] Furthermore, the aforementioned sealing bottom valve 3 consists of a valve core 20 and a valve seat 21. The valve core 20 is a section of steel pipe, with its top end welded to a buoy 22, which generates buoyancy. A slotted hole is opened on the side wall of the steel pipe. The valve seat 21 is also a section of steel pipe, with its lower end welded to a flange 23 for connecting to the extrusion pipeline 13. Small holes are opened on the upper side wall, each hole securing a constraint bolt 24. The outer diameter of the steel pipe in the valve core 20 is slightly smaller than the inner diameter of the steel pipe in the valve seat 21. The steel pipe in the valve core 20 is inserted into the steel pipe in the valve seat 21. Inside, the float 22 of the valve core 20 rests on the upper end of the steel pipe opening of the valve seat 21. The restraining bolt 24 on the valve seat 21 is installed through the strip hole on the side wall of the valve core 20. When the float 22 of the valve core 20 is located at the pipe opening of the steel pipe of the valve seat 21, the sealing bottom valve 3 is in the closed state. When there is liquid around, the valve core 20 rises due to the buoyancy until it is restrained by the restraining bolt 24 and stops rising. The sealing bottom valve 3 is in the fully open state, and the liquid enters through the strip hole and flows into the discharge line 13 from the lower part of the valve seat 21.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An asphalt venting system comprising an underground venting sump, an asphalt storage tank, a nitrogen gas line, a breather line, and an asphalt venting main, characterized in that, The upper part of the underground air release tank is provided with a nitrogen pipeline, a breathing pipeline and an asphalt air release main pipe, the other end of the breathing pipeline is connected with a air diffusing main pipe, the lower part of the underground air release tank is provided with a press-out pipeline, the other end of the press-out pipeline is connected with an asphalt storage tank, the nitrogen pipeline, the breathing pipeline, the asphalt air release main pipe and the press-out pipeline are all provided with electromagnetic valves, all the electromagnetic valves are connected with liquid level recording interlocking alarm instruments and pressure recording control instruments, and a gas sealing bottom valve is arranged at the connection position of the press-out pipeline and the underground air release tank.

2. An asphalt emptying system according to claim 1, wherein The asphalt air release system further comprises a loop pipeline and a bypass pipeline, one end of the loop pipeline is connected with the outlet end of the electromagnetic valve on the press-out pipeline, the other end of the loop pipeline is connected with the underground air release tank, and a gate valve one is arranged on the loop pipeline, the bypass pipeline is arranged in parallel with the breathing pipeline between the underground air release tank and the air diffusing main pipe.

3. An asphalt emptying system according to claim 1, wherein The outlet end of the electromagnetic valve on the breathing pipeline is provided with a throttle orifice plate.

4. An asphalt emptying system according to claim 2, wherein An electromagnetic valve is arranged on the bypass pipeline, and the electromagnetic valve on the bypass pipeline is connected with the liquid level recording interlocking alarm instruments and the pressure recording control instruments.

5. An asphalt emptying system according to claim 1, wherein A gate valve two is arranged on the press-out pipeline.

6. An asphalt emptying system according to claim 1, wherein The gas sealing bottom valve comprises a valve core and a valve seat, the valve core is a steel pipe with a side wall provided with a strip-shaped hole, and a float is arranged on the top of the valve core, the valve seat is a steel pipe with a flange arranged at the bottom, the flange is connected with the press-out pipeline, a constraint bolt is arranged on the side wall of the valve seat steel pipe, the valve core steel pipe is inserted into the valve seat steel pipe, the float of the valve core falls on the top end of the valve seat steel pipe, and the constraint bolt is arranged in the strip-shaped hole in cooperation.

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