Asphalt tank top oil-gas separation and purification device

Abstract

The utility model discloses an asphalt tank top oil-gas separation and purification device which comprises an asphalt tank, a cover body, a reaction mechanism, an ammonia water header pipe, a detection mechanism, a fuel gas conveying mechanism, an unqualified gas conveying mechanism and a fuel gas header pipe, a pressure guide pipe I is arranged on the cover body, and a pressure transmitter I is arranged on the top of the pressure guide pipe I; the reaction mechanism comprises an oil-gas pipe I, a fan, an oil-gas pipe II and an ammonia water tank which are sequentially connected, the oil-gas pipe I is communicated with the top of the cover body, an electric cut-off valve I is arranged on the oil-gas pipe I, the oil-gas pipe II is arranged in the ammonia water tank in a penetrating manner, an ammonia water pipe is arranged between an ammonia water header pipe and the ammonia water tank, a shower guide pipe is arranged at the bottom of the ammonia water tank, and a pressure transmitter I, the fan and the electric cut-off valve I are electrically connected with a DCS (Distributed Control System); a fuel gas pipe I is arranged outside the ammonia water tank, the fuel gas pipe I is communicated with the detection mechanism, the fuel gas conveying mechanism and the unqualified gas conveying mechanism, and the fuel gas conveying mechanism is communicated with the fuel gas header pipe. The device ensures the oil-gas separation and purification qualification rate of the asphalt tank top, protects the environment and saves the cost of companies.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas treatment technology for asphalt tank tops, and specifically relates to an oil and gas separation and purification device for asphalt tank tops. Background Technology

[0002] Asphalt is a commonly used high-viscosity organic chemical material with a wide range of applications. Classified by type, asphalt can be divided into petroleum asphalt, coal tar pitch, and natural asphalt. During production and manufacturing, asphalt plants often generate large amounts of asphalt oil and gas containing fine tar particles due to heating. This oil and gas contains carbocyclic hydrocarbons and their derivatives.

[0003] The existing solution is to install a breather valve on the top of the asphalt tank. When the oil and gas pressure reaches 1 kPa, the gas is released into the atmosphere through the breather valve on the top of the asphalt tank. This not only pollutes the environment and causes the environmental protection indicators of the asphalt tank area to fail to meet the standards, but also endangers human health. Utility Model Content

[0004] The purpose of this invention is to provide an oil-gas separation and purification device for the top of an asphalt tank to solve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An oil-gas separation and purification device for an asphalt tank top includes an asphalt tank and a cover installed on top of the asphalt tank. It also includes a reaction mechanism, an ammonia water main pipe, a detection mechanism, a fuel gas conveying mechanism, a non-conforming gas conveying mechanism, and a fuel gas main pipe. A pressure guiding pipe I is installed on the cover, and a pressure transmitter I is installed at the top of the pressure guiding pipe I. The reaction mechanism includes an oil-gas pipe I, a blower, an oil-gas pipe II, and an ammonia water tank connected sequentially along the oil-gas conveying direction. The inlet end of the oil-gas pipe I is connected to the top of the cover. An electric shut-off valve I is installed on the oil-gas pipe I. The oil-gas pipe II passes through the ammonia water tank. An ammonia water pipe connects the ammonia water main pipe and the ammonia water tank. A drain pipe is installed at the bottom of the ammonia water tank. The pressure transmitter I, the blower, and the electric shut-off valve I are electrically connected to a DCS (Distributed Control System). A fuel gas pipe I is installed on the outer wall of the ammonia water tank. The outlet end of the fuel gas pipe I is connected to the detection mechanism, the fuel gas conveying mechanism, and the non-conforming gas conveying mechanism. The fuel gas conveying mechanism is also connected to the fuel gas main pipe.

[0007] To further realize this utility model, a shut-off valve I, an electric shut-off valve I, a shut-off valve II, a thermal resistor, and a pressure transmitter II are sequentially arranged along the oil and gas transport direction on the oil and gas pipeline I. A pressure guide pipe II is provided between the pressure transmitter II and the oil and gas pipeline I. The thermal resistor is used to detect the temperature of the oil and gas in the oil and gas pipeline I, and the pressure transmitter II is used to detect the pressure of the oil and gas in the oil and gas pipeline I. When the temperature or pressure exceeds the preset value, the thermal resistor or the pressure transmitter II sends a signal to the DCS. The DCS then cuts off the transport of oil and gas through the shut-off valve I and the standby shut-off valve II.

[0008] To further realize this utility model, the detection mechanism includes a sampling tube and a chromatograph. The inlet end of the sampling tube is connected to the fuel gas pipe I, and the outlet end is connected to the chromatograph. A pressure reducing valve is installed on the sampling tube.

[0009] To further realize this utility model, the fuel gas conveying mechanism includes a fuel gas pipe II, the inlet end of which is connected to the fuel gas pipe I, and the outlet end of which is connected to the fuel gas main pipe. A shut-off valve III, a pneumatic regulating valve I, an electric shut-off valve II, and a one-way valve I are sequentially arranged on the fuel gas pipe II along the gas flow direction. The electric shut-off valve II is electrically connected to the DCS.

[0010] To further realize this utility model, the defective gas conveying mechanism includes a defective pipe, the inlet end of which is connected to fuel gas pipe I, the inlet end of which is located between shut-off valve II and thermal resistor, the outlet end of which is connected to oil and gas pipe I, and a shut-off valve IV, a cut-off valve III, a pneumatic regulating valve II and a one-way valve II are sequentially arranged on the defective pipe along the gas conveying direction.

[0011] To further realize this utility model, a shut-off valve V, a pneumatic regulating valve III, and a one-way valve III are sequentially installed on the ammonia water pipe along the ammonia water delivery direction. The pneumatic regulating valve III is used to regulate the water flow rate into the ammonia water tank.

[0012] To further realize this utility model, a drain valve is provided on the drain pipe.

[0013] To further realize this utility model, the distance between the insertion end of the oil and gas pipe II and the bottom surface of the ammonia tank is no more than 350mm.

[0014] To further realize this utility model, a level gauge is installed inside the ammonia tank. The level gauge is a magnetostrictive level gauge and is electrically connected to the DCS.

[0015] To further realize this utility model, the shut-off valve I, shut-off valve II, pressure reducing valve, shut-off valve III, pneumatic regulating valve I, shut-off valve IV, cut-off valve III, pneumatic regulating valve II, shut-off valve V, pneumatic regulating valve III and drain valve are all electric and are electrically connected to the DCS respectively. The thermal resistance and pressure transmitter II are electrically connected to the DCS respectively.

[0016] The advantages of this utility model compared to the prior art are as follows:

[0017] This invention utilizes ammonia water in an ammonia tank to wash away the oil and gas on the top of an asphalt tank, achieving oil and gas separation and purification. Maintenance personnel only need to add an oil and gas pipe (I) and an ammonia tank connected to it to the top of the asphalt tank. Oil and gas pipe I is connected to the inlet of a blower (a Roots booster blower is selected). The outlet of the blower is connected to oil and gas pipe (II). The bottom end of oil and gas pipe (II) extends into the ammonia tank, with a distance of no more than 350mm from the bottom of the tank. The ammonia water in the tank then separates the oil and gas from the asphalt tank extracted by the blower. The purified fuel gas can then enter through fuel gas pipe (II). The fuel gas is fed into the main fuel gas pipe to supply fuel to the burners of the heating furnace. A chromatograph is installed at the outlet of fuel gas pipe I. If the composition of the components analyzed by the chromatograph is unqualified, fuel gas pipe II must be shut off and the ammonia in the ammonia tank replaced. At this time, the Roots booster blower is stopped remotely via DCS, the electric shut-off valve I is closed, the drain pipe is opened and closed after the ammonia is drained, and then the ammonia tank is filled with ammonia. After the ammonia is replaced, the ammonia pipe is closed, the electric shut-off valve I and the unqualified pipe are opened, and after the chromatograph analyzes the composition and it is qualified, the unqualified pipe is closed and fuel gas pipe II is opened to continue operation.

[0018] In this invention, the control signals of pressure transmitter I, Roots booster blower, and electric shut-off valve I are connected to the DCS system. The interlocking function is realized through the DCS program. When the pressure of pressure transmitter I reaches 1.2 kPa, electric shut-off valve I opens. After electric shut-off valve I is fully open, Roots booster blower starts automatically to extract the oil and gas accumulated on the top of the asphalt tank for water washing and purification. When the pressure reaches 0.85 kPa, Roots booster blower stops pumping air.

[0019] This utility model is simple to install and operate, reliable in use, and ensures the pass rate of oil-gas separation and purification on the top of the asphalt tank. It provides qualified and pure fuel gas for the burner of the heating furnace, which not only protects the environment but also saves the company's production costs, achieving a win-win situation for both economic and environmental benefits. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] The meanings of the reference numerals in the attached diagram are as follows: 1. Asphalt tank; 2. Cover; 3. Ammonia main pipe; 4. Fuel gas main pipe; 5. Pressure guide pipe I; 6. Pressure transmitter I; 7. Oil and gas pipe I; 8. Fan; 9. Oil and gas pipe II; 10. Ammonia tank; 11. Electric shut-off valve I; 12. Ammonia pipe; 13. Drain pipe; 14. Fuel gas pipe I; 15. Shut-off valve I; 16. Shut-off valve II; 17. Resistance temperature detector (RTD); 18. Pressure transmitter II; 19. Pressure guide pipe II 20. Sampling tube; 21. Chromatography analyzer; 22. Pressure reducing valve; 23. Fuel gas pipe II; 24. Shut-off valve III; 25. Pneumatic regulating valve I; 26. Electric shut-off valve II; 27. Check valve I; 28. Non-conforming tube; 29. ​​Shut-off valve IV; 30. Shut-off valve III; 31. Pneumatic regulating valve II; 32. Check valve II; 33. Shut-off valve V; 34. Pneumatic regulating valve III; 35. Check valve III; 36. Drain valve; 37. Level gauge. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, an oil-gas separation and purification device for asphalt tank top includes an asphalt tank 1 and a cover 2 disposed on the top of the asphalt tank 1. It also includes a reaction mechanism, an ammonia water main pipe 3, a detection mechanism, a fuel gas conveying mechanism, a non-conforming gas conveying mechanism, and a fuel gas main pipe 4. A pressure guiding pipe I5 is disposed on the cover 2, and a pressure transmitter I6 is disposed on the top of the pressure guiding pipe I5.

[0024] The reaction mechanism includes an oil and gas pipe I7, a blower 8, an oil and gas pipe II9, and an ammonia tank 10 connected sequentially along the oil and gas conveying direction. The inlet end of the oil and gas pipe I7 is connected to the top of the cover 2. A shut-off valve I15, an electric shut-off valve I11, a shut-off valve II16, a thermal resistor 17, and a pressure transmitter II18 are sequentially installed on the oil and gas pipe I7 along the oil and gas conveying direction. A pressure guide pipe II19 is installed between the pressure transmitter II18 and the oil and gas pipe I7. The oil and gas pipe II9 passes through the ammonia tank 10. The distance between the inlet end of the oil and gas pipe II9 and the bottom surface of the ammonia tank 10 is... The ammonia water main pipe 3 is connected to the ammonia water tank 10 by an ammonia water pipe 12 with a diameter not exceeding 350mm. A level gauge 37 is installed in the ammonia water tank 10. The level gauge 37 is a magnetostrictive level gauge and is electrically connected to the DCS. A shut-off valve V33, a pneumatic regulating valve III34 and a one-way valve III35 are installed in sequence along the ammonia water delivery direction on the ammonia water pipe 12. A drain pipe 13 is installed at the bottom of the ammonia water tank 10. A drain valve 36 is installed on the drain pipe 13. A pressure transmitter I6, a fan 8 and an electric shut-off valve I11 are electrically connected to the DCS.

[0025] A fuel gas pipe I14 is installed on the outer wall of the ammonia tank 10. The outlet end of the fuel gas pipe I14 is connected to the detection mechanism, the fuel gas conveying mechanism and the unqualified gas conveying mechanism respectively. The fuel gas conveying mechanism is also connected to the fuel gas main pipe 4.

[0026] The testing mechanism includes a sampling tube 20 and a chromatograph 21. The inlet end of the sampling tube 20 is connected to the fuel gas pipe I14, and the outlet end is connected to the chromatograph 21. A pressure reducing valve 22 is installed on the sampling tube 20.

[0027] The fuel gas delivery mechanism includes fuel gas pipe II 23. The inlet end of fuel gas pipe II 23 is connected to fuel gas pipe I 14, and the outlet end is connected to fuel gas main pipe 4. Along the gas flow direction, the fuel gas pipe II 23 is sequentially equipped with a shut-off valve III 24, a pneumatic regulating valve I 25, an electric shut-off valve II 26, and a one-way valve I 27. The electric shut-off valve II 26 is electrically connected to the DCS.

[0028] The defective gas delivery mechanism includes a defective pipe 28. The inlet end of the defective pipe 28 is connected to the fuel gas pipe I 14. The inlet end of the defective pipe 28 is located between the shut-off valve II 16 and the thermal resistor 17. The outlet end of the defective pipe 28 is connected to the oil and gas pipe I 7. The defective pipe 28 is sequentially equipped with a shut-off valve IV 29, a cut-off valve III 30, a pneumatic regulating valve II 31, and a one-way valve II 32 along the gas delivery direction.

[0029] Among them, the shut-off valve I15, shut-off valve II16, pressure reducing valve 22, shut-off valve III24, pneumatic regulating valve I25, shut-off valve IV29, cut-off valve III30, pneumatic regulating valve II31, shut-off valve V33, pneumatic regulating valve III34 and drain valve 36 are all electric and are electrically connected to the DCS. The thermal resistance 17 and pressure transmitter II18 are electrically connected to the DCS.

[0030] During operation, when the pressure transmitter I6 reaches 1.2 kPa, the electric shut-off valve I11 opens. After the electric shut-off valve I11 is fully open, the Roots booster blower 8 starts automatically, drawing the oil and gas accumulated at the top of the asphalt tank 1 and transporting it to the ammonia water in the ammonia water tank 10 for oil and gas separation. The purified fuel gas can then enter the fuel gas main pipe 4 through the fuel gas pipe II23 to provide fuel for the heater burners. A chromatograph 21 is installed at the outlet of the fuel gas pipe I14 to detect the fuel gas. If the chromatograph 21 detects that the fuel gas composition is unqualified, the fuel gas pipe II23 must be shut off and the ammonia water tank replaced. The ammonia water in tank 10 is then remotely stopped via DCS. Roots booster blower 8 is stopped, electric shut-off valves I11 and II26 are closed, drain pipe 36 is opened and closed after the ammonia water is drained, then shut-off valve V33 is opened to fill ammonia water tank 10 through ammonia water pipe 12. After the ammonia water is replaced, ammonia water pipe 12 is closed, electric shut-off valves I11 and III30 are opened to connect the unqualified pipe 28, and the unqualified gas is transported back to oil and gas pipe I7 and re-transported into the ammonia water in ammonia water tank 10. After the chromatograph 21 analyzes the gas and finds it to be qualified, the unqualified pipe 28 is closed, and fuel gas pipe II23 is opened to continue operation.

[0031] When the pressure of pressure transmitter I6 reaches 0.85 kPa, the Roots booster blower 8 stops pumping air, and the purification operation is suspended.

Claims

1. An asphalt tank top oil gas separation and purification device, comprising an asphalt tank (1) and a cover (2) arranged on the top of the asphalt tank (1), characterized in that: The reaction mechanism, ammonia water main pipe (3), detection mechanism, fuel gas delivery mechanism, substandard gas delivery mechanism and fuel gas main pipe (4) are further included, a guide pressure pipe I (5) is arranged on the cover body (2), and a pressure transmitter I (6) is arranged on the top of the guide pressure pipe I (5); the reaction mechanism includes an oil gas pipe I (7), a fan (8), an oil gas pipe II (9) and an ammonia water tank (10) which are sequentially connected along the oil gas delivery direction, the entering end of the oil gas pipe I (7) is communicated with the top of the cover body (2), an electric cut-off valve I (11) is arranged on the oil gas pipe I (7), the oil gas pipe II (9) is arranged in the ammonia water tank (10), an ammonia water pipe (12) is arranged between the ammonia water main pipe (3) and the ammonia water tank (10) to realize communication, a guide pipe (13) is arranged on the bottom of the ammonia water tank (10), the pressure transmitter I (6), the fan (8) and the electric cut-off valve I (11) are respectively electrically connected with a DCS; a fuel gas pipe I (14) is arranged on the outer wall of the ammonia water tank (10), the outlet end of the fuel gas pipe I (14) is respectively communicated with the detection mechanism, the fuel gas delivery mechanism and the substandard gas delivery mechanism, and the fuel gas delivery mechanism is further communicated with the fuel gas main pipe (4).

2. The asphalt tank vapor recovery unit of claim 1, wherein: A cut-off valve I (15), the electric cut-off valve I (11), a cut-off valve II (16), a thermal resistance (17) and a pressure transmitter II (18) are sequentially arranged on the oil gas pipe I (7) along the oil gas delivery direction, and a guide pressure pipe II (19) is arranged between the pressure transmitter II (18) and the oil gas pipe I (7).

3. The asphalt tank vapor recovery unit of claim 2, wherein: The detection mechanism includes a sampling pipe (20) and a chromatographic analyzer (21), the inlet end of the sampling pipe (20) is communicated with the fuel gas pipe I (14), the outlet end is communicated with the chromatographic analyzer (21), and a pressure reducing valve (22) is arranged on the sampling pipe (20).

4. The asphalt tank vapor recovery unit of claim 3, wherein: The fuel gas delivery mechanism includes a fuel gas pipe II (23), the inlet end of the fuel gas pipe II (23) is communicated with the fuel gas pipe I (14), the outlet end is communicated with the fuel gas main pipe (4), a cut-off valve III (24), a pneumatic regulating valve I (25), an electric cut-off valve II (26) and a check valve I (27) are sequentially arranged on the fuel gas pipe II (23) along the gas flow direction, and the electric cut-off valve II (26) is electrically connected with a DCS.

5. The asphalt tank vapor recovery unit of claim 4, wherein: The substandard gas delivery mechanism includes a substandard pipe (28), the inlet end of the substandard pipe (28) is communicated with the fuel gas pipe I (14), the inlet end of the substandard pipe (28) is arranged between the cut-off valve II (16) and the thermal resistance (17), the outlet end of the substandard pipe (28) is communicated with the oil gas pipe I (7), and a cut-off valve IV (29), a cut-off valve III (30), a pneumatic regulating valve II (31) and a check valve II (32) are sequentially arranged on the substandard pipe (28) along the gas delivery direction.

6. The asphalt tank vapor recovery unit of claim 5, wherein: A cut-off valve V (33), a pneumatic regulating valve III (34) and a check valve III (35) are sequentially arranged on the ammonia water pipe (12) along the ammonia water delivery direction.

7. The asphalt tank vapor recovery unit of claim 6, wherein: A guide valve (36) is arranged on the guide pipe (13).

8. The asphalt tank vapor recovery unit of claim 7, wherein: The distance between the penetrating end of the oil gas pipe II (9) and the bottom surface of the ammonia water tank (10) is not greater than 350 mm.

9. The asphalt tank vapor recovery unit of claim 8, wherein: The ammonia water tank (10) is provided with a liquid level meter (37), the liquid level meter (37) adopts a magnetostrictive liquid level meter, and the liquid level meter (37) is electrically connected with the DCS.

10. The asphalt tank vapor recovery unit of claim 9, wherein: The stop valve I (15), the stop valve II (16), the pressure reducing valve (22), the stop valve III (24), the pneumatic regulating valve I (25), the stop valve IV (29), the cut-off valve III (30), the pneumatic regulating valve II (31), the stop valve V (33), the pneumatic regulating valve III (34) and the guide valve (36) are all electric, and are electrically connected with the DCS respectively, and the thermistor (17) and the pressure transmitter II (18) are electrically connected with the DCS respectively.

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