Device for protecting normal take-off of safety valve in tower gas-liquid separation

Abstract

The utility model relates to the technical field of chemical production, and particularly discloses a device for protecting normal take-off of a safety valve for tower gas-liquid separation. The device comprises a safety valve protection valve group, an automatic exhaust regulating valve protection valve group, a first protection pipeline, a second protection pipeline, a matching raffinate C4 tank and a butylene water washing tower, the safety valve protection valve group comprises a safety valve protection valve and a safety valve; and the automatic exhaust regulating valve protection valve group comprises an automatic exhaust valve, a pouring valve and an automatic exhaust regulating valve protection valve. The device can effectively separate the gas phase and the liquid phase at the top of the tower, ensures that most of the gas phase at the top of the tower enters the tower through a newly added pipeline, and after most of the gas phase is separated from the liquid phase, pressure mutation caused by gas-liquid phase space extrusion is avoided, gas-liquid phase entrainment is prevented, gas-phase materials are discharged in time, and the production efficiency is improved. Sudden pressure change, process fluctuation and safety valve jumping of materials sent out from the tower top are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, and specifically discloses a device for normal tripping of a tower gas-liquid separation protection safety valve. Background Art

[0002] The butadiene unit adopts the acetonitrile method to produce butadiene. The products are butadiene, C4 extraction and residual liquid. The power pump sends C4 extraction to the butene water washing tower T302, and adds cooled condensate water at the top of the tower. The washing water is cooled steam condensate. Through liquid-liquid contact, the acetonitrile entrained in the C4 extraction is washed away. The washing water and the washed acetonitrile are sent from the bottom of the tower to the feed layer of the alkyne water washing tower T303 by their own pressure. The C4 extraction without acetonitrile is obtained at the top of the tower and sent to the C4 extraction tank V301 after being adjusted by the pressure gauge. The pressure at the top of T302 is generally 0.50-0.65MPa. In actual production, there is a mixed gas-liquid situation at the top of T302. The gas-liquid mixed phase material is sent to V301 through the top pipeline at the top of T302. A safety valve is installed at the top of T302. The gas-liquid phase feed causes large fluctuations in material pressure, affecting the feeding stability. It is easy to form mutual squeezing of gas-liquid phase space, and the sudden change in pressure causes the safety valve to trip.

[0003] Therefore, it is necessary to design a device to ensure the normal tripping of the tower gas-liquid separation protection safety valve to avoid process fluctuations and tripping of the safety valve caused by sudden changes in the pressure of the material delivered from the top of the tower. Utility Model Content

[0004] The technical solution adopted by the utility model is as follows:

[0005] A device for the normal tripping of a tower gas-liquid separation protection safety valve, comprising a safety valve protection valve group, an automatic exhaust regulating valve protection valve group, a first protection pipeline 15 and a second protection pipeline 16, in conjunction with a residual carbon four tank 17 and a butene water washing tower 18;

[0006] The safety valve protection valve group includes a safety valve protection valve and a safety valve 5; the automatic exhaust regulating valve protection valve group includes an automatic exhaust valve 13, a backwash valve 14 and an automatic exhaust regulating valve protection valve;

[0007] The top side of the butene water washing tower 18 is connected to one end of the automatic exhaust valve 13 through the first protection pipeline 15, and the other end of the automatic exhaust valve 13 is connected to the top of the residual carbon four tank 17 through the second protection pipeline 16; an automatic exhaust regulating valve protection valve is provided before or after the automatic exhaust valve 13; a backwash branch pipeline is provided on the first protection pipeline 15 before the automatic exhaust valve 13, and a backwash valve 14 is provided at the end of the backwash branch pipeline;

[0008] A safety valve branch pipeline is provided on the first protection pipeline 15 before the inverted shower branch pipeline. One end of the safety valve branch pipeline is connected to one end of the safety valve protection valve, and the other end of the safety valve protection valve is a pressure relief port 9 at the pipeline outlet; a second safety valve branch pipeline is provided on the safety valve branch pipeline, and a safety valve 5 is provided at the end of the second safety valve branch pipeline.

[0009] Preferably, two safety valve protection valves are provided, namely the first safety valve protection valve 4 and the second safety valve protection valve 6; the first safety valve protection valve 4 and the second safety valve protection valve 6 are respectively in front of and behind the bifurcation point of the second safety valve branch pipeline on the safety valve branch pipeline.

[0010] Furthermore, the safety valve protection valve group is also provided with a safety valve bypass valve 7 and a safety valve bypass pressure relief valve 8; one end of the safety valve bypass valve 7 is connected in front of the first safety valve protection valve 4, and the other end is connected behind the second safety valve protection valve 6, in parallel; the safety valve bypass pressure relief valve 8 is in parallel in front of the first safety valve protection valve 4 and the safety valve bypass valve 7.

[0011] Preferably, two automatic exhaust regulating valve protection valves are provided, namely the first automatic exhaust regulating valve protection valve 10 and the second automatic exhaust regulating valve protection valve 12; the first automatic exhaust regulating valve protection valve 10 and the second automatic exhaust regulating valve protection valve 12 are respectively in front of and behind the automatic exhaust valve 13.

[0012] Furthermore, the automatic exhaust regulating valve protection valve group is also provided with an automatic exhaust bypass valve 11; one end of the automatic exhaust bypass valve 11 is connected in front of the first automatic exhaust regulating valve protection valve 10, and the other end is connected behind the second automatic exhaust regulating valve protection valve 12, in parallel.

[0013] Preferably, a residual carbon four tank discharge pipe 21 is provided at the bottom of the raffinate C4 tank 17.

[0014] Preferably, a raffinate C4 feed line 1 is provided on the side of the bottom of the butene water wash tower 18.

[0015] Preferably, a washing water draw-off line 2 containing acetonitrile is provided below the bottom of the butene water wash tower 18.

[0016] Preferably, a condensate water inlet line 3 is provided on the side of the upper part of the butene water wash tower 18, and the condensate water inlet line 3 is below the first protection pipeline 15.

[0017] Preferably, a pipeline is provided at the top of the butene water wash tower 18 and connected to the top of the raffinate C4 tank 17, and a liquid-phase pneumatic regulating valve group 20 is provided in the middle of the pipeline; a branch pipeline is provided in front of the liquid-phase pneumatic regulating valve group 20, and the branch pipeline is connected to the liquid-phase safety valve group 19.

[0018] Beneficial effects achieved by the utility model:

[0019] The utility model can effectively separate the gas and liquid phases at the top of the T302 tower, ensuring that most of the gas phase at the top of the tower enters V301 through the newly added pipeline. After most of the gas phase is separated from the liquid phase, no sudden pressure change caused by the mutual squeezing of the gas and liquid phase space will occur, preventing the entrainment of gas and liquid phases. The gas phase material can be discharged in time through the newly added pipeline and valve, avoiding the sudden pressure change when sending out the material at the top of the tower, which causes process fluctuations and the tripping of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the deoxidation inhibitor adding device for the reflux tank of the light removal tower for preparing butadiene by acetonitrile method DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail in conjunction with the following embodiments. It should be noted that the utility model is not limited to the following embodiments.

[0022] Example 1

[0023] A device for the normal tripping of a tower gas-liquid separation protection safety valve, comprising a safety valve protection valve group, an automatic exhaust regulating valve protection valve group, a first protection pipeline 15 and a second protection pipeline 16, in conjunction with a residual carbon four tank 17 and a butene water washing tower 18;

[0024] The safety valve protection valve group includes a safety valve protection valve and a safety valve 5; the automatic exhaust regulating valve protection valve group includes an automatic exhaust valve 13, a backwash valve 14 and an automatic exhaust regulating valve protection valve;

[0025] The top side of the butene water washing tower 18 is connected to one end of the automatic exhaust valve 13 through the first protection pipeline 15, and the other end of the automatic exhaust valve 13 is connected to the top of the residual carbon four tank 17 through the second protection pipeline 16; an automatic exhaust regulating valve protection valve is provided before or after the automatic exhaust valve 13; a backwash branch pipeline is provided on the first protection pipeline 15 before the automatic exhaust valve 13, and a backwash valve 14 is provided at the end of the backwash branch pipeline;

[0026] A safety valve branch pipeline is provided on the first protection pipeline 15 in front of the backwash branch pipeline, and the safety valve branch pipeline is connected to one end of the safety valve protection valve. The other end of the pipeline outlet of the safety valve protection valve is a pressure relief port 9; a safety valve second branch pipeline is provided on the safety valve branch pipeline, and a safety valve 5 is provided at the end of the safety valve second branch pipeline.

[0027] There are two safety valve protection valves provided, namely the first safety valve protection valve 4 and the second safety valve protection valve 6; the first safety valve protection valve 4 and the second safety valve protection valve 6 are respectively located before and after the bifurcation point of the second branch pipeline of the safety valve on the safety valve branch pipeline. The safety valve protection valve group is also provided with a safety valve bypass valve 7 and a safety valve bypass pressure relief valve 8; one end of the safety valve bypass valve 7 is connected before the first safety valve protection valve 4 and the other end is connected after the second safety valve protection valve 6, showing a parallel connection; the safety valve bypass pressure relief valve 8 is connected in parallel before the first safety valve protection valve 4 and the safety valve bypass valve 7.

[0028] There are two automatic exhaust regulating valve protection valves provided, namely the first automatic exhaust regulating valve protection valve 10 and the second automatic exhaust regulating valve protection valve 12; the first automatic exhaust regulating valve protection valve 10 and the second automatic exhaust regulating valve protection valve 12 are respectively located before and after the automatic exhaust valve 13. The automatic exhaust regulating valve protection valve group is also provided with an automatic exhaust bypass valve 11; one end of the automatic exhaust bypass valve 11 is connected before the first automatic exhaust regulating valve protection valve 10 and the other end is connected after the second automatic exhaust regulating valve protection valve 12, showing a parallel connection.

[0029] A raffinate C4 tank 17 is provided with a raffinate C4 discharge pipe 21 at the bottom; a raffinate C4 feed line 1 is provided on the side of the bottom of the butene water washing tower 18; a washing water extraction line 2 containing acetonitrile is provided below the bottom of the butene water washing tower 18; a condensate water inlet line 3 is provided on the side of the upper part of the butene water washing tower 18, and the condensate water inlet line 3 is located below the first protection pipeline 15.

[0030] The top of the butene water washing tower 18 is provided with a pipeline connected to the top of the raffinate C4 tank 17, and a liquid-phase pneumatic regulating valve group 20 is provided in the middle of the pipeline; a branch pipeline is provided before the liquid-phase pneumatic regulating valve group 20, and the branch pipeline is connected to the liquid-phase safety valve group 19.

[0031] The working principle of the present utility model is: it is set that when the gas phase pressure exceeds 0.76 MPa, the safety valve 5 jumps to prevent the equipment from bursting due to overpressure. During use, the first safety valve protection valve 4 and the second safety valve protection valve 6 are closed, and the safety valve bypass pressure relief valve 8 is opened, which can achieve effective isolation when the safety valve is damaged and replaced. The pressure relief point 9 can be connected to the flare gas recovery system, and the safety valve bypass pressure relief valve 8 can empty the materials remaining in the pipeline.

[0032] Open the automatic exhaust regulating valve protection valves 10 and 12. By controlling the automatic exhaust valve 13, the gaseous material enters the V301 tank, and the liquid material enters the V301 tank through the liquid-phase pneumatic regulating valve group 20. The gas-liquid separation is achieved by adding this pipeline and the corresponding valve group to ensure that the gaseous medium does not mix with the liquid phase and enter the overhead pipeline. When the automatic exhaust valve 13 needs to be replaced, close the automatic exhaust regulating valve protection valve 10, open the automatic exhaust bypass valve 11, close the automatic exhaust regulating valve protection valve 12, and open the drain valve 14 to relieve the pressure, then the automatic exhaust valve 13 can be replaced.

Claims

1. A device for the normal tripping of a tower gas-liquid separation protection safety valve, characterized in that: It includes a safety valve protection valve group, an automatic exhaust regulating valve protection valve group, a first protection pipeline (15) and a second protection pipeline (16), and cooperates with a carbon four extraction tank (17) and a butene water washing tower (18); The safety valve protection valve group includes a safety valve protection valve and a safety valve (5); the automatic exhaust regulating valve protection valve group includes an automatic exhaust valve (13), a backwash valve (14) and an automatic exhaust regulating valve protection valve; The top side of the butene water washing tower (18) is connected to one end of the automatic exhaust valve (13) through a first protection pipeline (15), and the other end of the automatic exhaust valve (13) is connected to the top of the residual carbon four tank (17) through a second protection pipeline (16); an automatic exhaust regulating valve protection valve is provided before or after the automatic exhaust valve (13); a backwash branch pipeline is provided on the first protection pipeline (15) before the automatic exhaust valve (13), and a backwash valve (14) is provided at the end of the backwash branch pipeline; A safety valve branch pipeline is provided on the first protection pipeline (15) in front of the backwash branch pipeline. The safety valve branch pipeline is connected to one end of the safety valve protection valve. The other end of the safety valve protection valve has a pipeline outlet as a pressure relief port (9). A safety valve second branch pipeline is provided on the safety valve branch pipeline. A safety valve (5) is provided at the end of the safety valve second branch pipeline.

2. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 1 is characterized in that: The safety valve protection valves are provided with two in total, namely a first safety valve protection valve (4) and a second safety valve protection valve (6); the first safety valve protection valve (4) and the second safety valve protection valve (6) are respectively located before and after the bifurcation point of the second branch pipeline of the safety valve on the safety valve branch pipeline.

3. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 2 is characterized in that: The safety valve protection valve group is also provided with a safety valve bypass valve (7) and a safety valve bypass pressure relief valve (8); one end of the safety valve bypass valve (7) is connected in front of the first safety valve protection valve (4), and the other end is connected in parallel to the rear of the second safety valve protection valve (6); the safety valve bypass pressure relief valve (8) is connected in parallel to the first safety valve protection valve (4) and the safety valve bypass valve (7).

4. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 1 is characterized in that: The automatic exhaust regulating valve protection valves are provided with two in total, namely a first automatic exhaust regulating valve protection valve (10) and a second automatic exhaust regulating valve protection valve (12); the first automatic exhaust regulating valve protection valve (10) and the second automatic exhaust regulating valve protection valve (12) are respectively located in front of and behind the automatic exhaust valve (13).

5. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 4 is characterized in that: The automatic exhaust regulating valve protection valve group is also provided with an automatic exhaust bypass valve (11); one end of the automatic exhaust bypass valve (11) is connected in front of the first automatic exhaust regulating valve protection valve (10), and the other end is connected in parallel to the rear of the second automatic exhaust regulating valve protection valve (12).

6. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 1, characterized in that: A residual carbon four tank discharge pipe (21) is provided at the bottom of the residual carbon four tank (17).

7. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 1 is characterized in that: A C4 extraction feed line (1) is provided on the side of the bottom of the butene water washing tower (18).

8. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 1 is characterized in that: A washing water extraction line (2) containing acetonitrile is provided below the bottom of the butene water washing tower (18).

9. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 1, characterized in that: A condensate water inlet line (3) is provided on the upper side of the butene water washing tower (18), and the condensate water inlet line (3) is located below the first protection pipeline (15).

10. The device for normal tripping of the tower gas-liquid separation protection safety valve according to claim 1, characterized in that: A pipeline is provided at the top of the butene washing tower (18) and connected to the top of the residual carbon four tank (17), and a liquid phase pneumatic regulating valve group (20) is provided in the middle of the pipeline; a branch pipeline is provided in front of the liquid phase pneumatic regulating valve group (20), and the branch pipeline is connected to the liquid phase safety valve group (19).

Images