Benzene unloading crane pipe purging device

Abstract

The utility model discloses a benzene unloading crane pipe purging device, which belongs to the technical field of chemical equipment and is characterized in that a liquid-phase vertical pipe, a ball valve, a four-way pipe, a breaking bolt type snap valve and a female quick connector are arranged on a crane pipe, and the ball valve, the four-way pipe, the liquid-phase vertical pipe, the breaking bolt type snap valve and the female quick connector are sequentially in threaded connection. A liquid-phase pipeline of the four-way pipe is connected with a crane pipe ball valve and a liquid-phase vertical pipe respectively, a gas-phase pipeline is connected with a nitrogen inlet hose and a nitrogen outlet hose through flanges respectively, and the problem that an operator is prone to body injury due to long-term contact when an iron drum is opened for collection is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical energy conservation and consumption reduction, and specifically relates to a benzene unloading crane pipe purging device. Background Art

[0002] As an extremely important chemical raw material, benzene is widely used in the entire chemical production field. At present, in the aspect of road tanker for benzene transportation, all are atmospheric pressure tankers. In the aspect of unloading crane pipes, since dry valves cannot be used, ordinary ball valves are used. The disadvantages of the existing unloading crane pipes are as follows:

[0003] 1) Residual materials between the crane pipe ball valve and the tanker ball valve cannot be recovered, resulting in material waste;

[0004] 2) During the process of disconnecting the quick connector of the crane pipe, the residual liquid is collected in an iron bucket, resulting in excessive VOCs emissions;

[0005] 3) Benzene is a highly toxic carcinogen. When collected in an open iron bucket, long-term exposure by operators is likely to cause physical damage. Summary of the Invention

[0006] The purpose of the utility model is to solve the problem that when collecting in an open iron bucket, long-term exposure by operators is likely to cause physical damage.

[0007] The utility model specifically discloses the following content: a benzene unloading crane pipe purging device, which is characterized by comprising a crane pipe and a nitrogen purging system;

[0008] A liquid-phase vertical pipe, a ball valve, a four-way pipe, a break-away bolt type break-away valve, and a female quick connector are arranged on the crane pipe. The ball valve, the four-way pipe, the liquid-phase vertical pipe, the break-away bolt type break-away valve, and the female quick connector are sequentially thread-connected. The liquid-phase pipeline of the four-way pipe is respectively connected to the crane pipe ball valve and the liquid-phase vertical pipe, and the gas-phase pipeline is respectively flange-connected to the nitrogen inlet hose and the nitrogen exhaust hose;

[0009] The nitrogen purging system includes a pressure reducing valve, a first flange stub, a first check valve, a second flange stub, a second check valve, a first elbow, an inlet ball valve, a first flange single head, a nitrogen inlet hose, an exhaust ball valve, a second elbow, a nitrogen exhaust hose, a double-branch pipe, a pressure gauge ball valve, a first double head, an on-line pressure gauge, a density meter ball valve, a second double head, and an on-line density meter. The pressure reducing valve, the first flange stub, the first check valve, the second flange stub, and the second check valve are sequentially flange-connected;

[0010] The first elbow is flange-connected to the second check valve;

[0011] The first elbow, the inlet ball valve, and the first flange single head are sequentially thread-connected;

[0012] The single flange head, the nitrogen inlet hose, the four-way pipe, the nitrogen exhaust hose and the elbow two are flange-connected in sequence;

[0013] The elbow two, the exhaust ball valve and the double branch pipe are thread-connected in sequence;

[0014] The double branch pipe, the pressure gauge ball valve, the double wire head one and the on-line pressure gauge are thread-connected in sequence;

[0015] The double branch pipe, the densitometer ball valve, the double wire head two and the on-line densitometer are thread-connected in sequence.

[0016] Preferably, the four-way pipe is thread-connected, with a liquid phase side diameter of DN100 and a gas phase side diameter of DN25.

[0017] Preferably, the pressure reducing valve reduces the pressure of the nitrogen pipe network from 0.7 MPa to the purging pressure of 0.4 MPa;

[0018] Preferably, the check valve one is a swing type and the check valve two is a lift type;

[0019] Preferably, the nitrogen inlet hose is connected by a DN25, CL150 quick coupling;

[0020] Preferably, the nitrogen exhaust hose is connected by a DN25, CL150 quick coupling;

[0021] Preferably, the on-line pressure gauge has both local and remote display functions;

[0022] Preferably, the on-line densitometer has both local and remote display functions.

[0023] Compared with the prior art, the technical effects and advantages of the present utility model are:

[0024] After nitrogen purging and replacement, it is ensured that during the process of disconnecting the loading arm connection, the operator will not come into contact with benzene, reducing the poisoning risk;

[0025] After nitrogen purging and replacement, it is ensured that during the process of disconnecting the loading arm connection, benzene will not leak into the environment, reducing VOCs emissions;

[0026] Nitrogen is continuously purged. Observe the on-line pressure gauge to ensure that the system is not over-pressurized. Observe the reading of the on-line densitometer. When the displayed nitrogen density no longer changes, it indicates that the replacement is qualified;

[0027] The present utility model avoids long-term contact of the operator and ensures the physical safety of the on-site personnel. Description of the Drawings

[0028] Figure 1 is the side view of the present utility model;

[0029] Figure 2 is the present utility model Figure 1 partial view. Specific Embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0031] In one embodiment, referring to Figure 1 and Figure 2 , a benzene unloading arm purging device, characterized in that it includes an unloading arm and a nitrogen purging system;

[0032] A liquid-phase vertical pipe A7, a ball valve A8, a four-way pipe A9, a break-away bolt type break-away valve A10, and a female quick connector A11 are arranged on the unloading arm. The ball valve A8, the four-way pipe A9, the liquid-phase vertical pipe A7, the break-away bolt type break-away valve A10, and the female quick connector A11 are sequentially thread-connected. The liquid-phase pipeline of the four-way pipe A9 is respectively connected to the unloading arm ball valve A8 and the liquid-phase vertical pipe A7, and the gas-phase pipeline is respectively flange-connected to the nitrogen inlet hose B5 and the nitrogen exhaust hose B11;

[0033] In one embodiment, referring to Figure Figure 2 , the nitrogen purging system includes a pressure reducing valve B1, a flange stub one B16, a check valve one B2, a flange stub two B17, a check valve two B3, an elbow one B18, an inlet ball valve B4, a flange single ferrule one B19, a nitrogen inlet hose B5, an exhaust ball valve B10, an elbow two B20, a nitrogen exhaust hose B11, a double-branch pipe B21, a pressure gauge ball valve B12, a double ferrule one B22, an on-line pressure gauge B13, a density meter ball valve B14, a double ferrule two B23, and an on-line density meter B15. The pressure reducing valve B1, the flange stub one B16, the check valve one B2, the flange stub two B17, and the check valve two B3 are sequentially flange-connected;

[0034] The elbow one B18 is flange-connected to the check valve two B3;

[0035] The elbow one B18, the inlet ball valve B4, and the flange single ferrule one B19 are sequentially thread-connected;

[0036] The flange single ferrule one B19, the nitrogen inlet hose B5, the four-way pipe A9, the nitrogen exhaust hose B11, and the elbow two B20 are sequentially flange-connected;

[0037] The elbow two B20, the exhaust ball valve B10, and the double-branch pipe B21 are sequentially thread-connected;

[0038] The double-branch pipe B21, the pressure gauge ball valve B12, the double-threaded head one B22, and the on-line pressure gauge B13 are sequentially connected by threads.

[0039] The double-branch pipe B21, the densitometer ball valve B14, the double-threaded head two B23, and the on-line densitometer B15 are sequentially connected by threads.

[0040] In one embodiment, the four-way pipe A9 is connected by threads. The liquid phase side has a DN100 pipe diameter, and the gas phase side has a DN25 pipe diameter.

[0041] In one embodiment, the pressure reducing valve B1 reduces the pressure of the nitrogen pipeline network from 0.7 MPa to the purging pressure of 0.4 MPa.

[0042] In one embodiment, the check valve one B2 is a swing type, and the check valve two B3 is a lift type.

[0043] In one embodiment, the nitrogen inlet hose B5 is connected by a DN25, CL150 quick coupling.

[0044] In one embodiment, the nitrogen exhaust hose B11 is connected by a DN25, CL150 quick coupling.

[0045] In one embodiment, the on-line pressure gauge B13 has both local and remote display functions.

[0046] In one embodiment, the on-line densitometer B15 has both local and remote display functions.

[0047] In one embodiment; this embodiment provides a benzene unloading loading arm with a purging system that uses reduced-pressure nitrogen for purging and replacement to achieve zero emissions of VOCs during the benzene unloading process. The working principle includes the following steps:

[0048] Step 1: Connect the female quick coupling A11 of the loading arm to the quick coupling of the tank car.

[0049] Step 2: Open the ball valve A8, close the inlet ball valves B4 and B10, connect the tank car and the loading arm unloading process, complete the benzene unloading according to the unloading operation procedures, and close the tank car ball valve and the loading arm ball valve A8 after the benzene unloading is completed.

[0050] Step 3: Close the loading arm ball valve A8, open the inlet ball valve B4 and the inlet ball valve B10 to connect the nitrogen purging process, open the pressure gauge ball valve B12 and the densitometer ball valve B14 to connect the monitoring process. The nitrogen is reduced to 0.4 MPa by the pressure reducing valve B1, and then enters the four-way pipe A9 through the flange stub B16, check valve 1 B2, flange stub B17, check valve 2 B3, elbow 1 B18, inlet ball valve B4, flange single ferrule B19, and nitrogen inlet hose B5. The residual benzene liquid between the loading arm ball valve A8 and the tank car ball valve is purged to the dense drain tank through the nitrogen exhaust hose B11, elbow 2 B20, exhaust ball valve B10, and double branch pipe B21;

[0051] Step 4: Keep purging with nitrogen. Observe the online pressure gauge B13 to ensure that the system is not overpressurized. Observe the reading of the online densitometer B15. When the nitrogen density no longer changes, it indicates that the replacement is qualified;

[0052] Step 5: Close the inlet ball valve B4. After the online pressure gauge B13 of the nitrogen purging system shows no pressure, close the exhaust ball valve B10;

[0053] Step 6: Disconnect the female quick connector A11 of the loading arm and the tank car, and reset the loading arm.

Claims

1. A benzene unloading crane pipe purging device, characterized in that: Including crane pipe and nitrogen purge system; The crane pipe is provided with a liquid phase vertical pipe (A7), a ball valve (A8), a four-way pipe (A9), a break bolt type break valve (A10), and a female quick connector (A11); the ball valve (A8), the four-way pipe (A9), the liquid phase vertical pipe (A7), the break bolt type break valve (A10), and the female quick connector (A11) are threadedly connected in sequence; the liquid phase pipeline of the four-way pipe (A9) is respectively connected to the crane pipe ball valve (A8) and the liquid phase vertical pipe (A7); and the gas phase pipeline is respectively flange-connected to the nitrogen inlet hose (B5) and the nitrogen exhaust hose (B11); The nitrogen purge system comprises a pressure reducing valve (B1), a flange short circuit 1 (B16), a check valve 1 (B2), a flange short circuit 2 (B17), a check valve 2 (B3), an elbow 1 (B18), an inlet ball valve (B4), a flange single wire head 1 (B19), a nitrogen inlet hose (B5), an exhaust ball valve (B10), an elbow 2 (B20), a nitrogen exhaust hose (B11), a double branch pipe (B21), a pressure gauge ball valve (B12), a double wire head 1 (B22), an online pressure gauge (B13), a density meter ball valve (B14), a double wire head 2 (B23) and an online density meter (B15); the pressure reducing valve (B1), the flange short circuit 1 (B16), the check valve 1 (B2), the flange short circuit 2 (B17) and the check valve 2 (B3) are flange-connected in sequence; Elbow 1 (B18) is flange-connected to check valve 2 (B3); The elbow 1 (B18), the inlet ball valve (B4) and the flange single wire head 1 (B19) are threadedly connected in sequence; The flanged monofilament head 1 (B19), the nitrogen inlet hose (B5), the four-way pipe (A9), the nitrogen exhaust hose (B11) and the elbow 2 (B20) are flange-connected in sequence; The second elbow (B20), the exhaust ball valve (B10) and the double branch pipe (B21) are threadedly connected in sequence; The double branch pipe (B21), the pressure gauge ball valve (B12), the double thread head 1 (B22) and the online pressure gauge (B13) are threadedly connected in sequence; The double branch pipe (B21), the density meter ball valve (B14), the double thread head (B23) and the online density meter (B15) are threadedly connected in sequence.

2. A benzene unloading crane pipe purging device according to claim 1, characterized in that: The four-way pipe (A9) is threaded, with a pipe diameter of DN100 on the liquid phase side and a pipe diameter of DN25 on the gas phase side.

3. A benzene unloading crane pipe purging device according to claim 1, characterized in that: The pressure reducing valve (B1) reduces the pressure of the nitrogen network from 0.7MPa to the purge pressure of 0.4MPa.

4. A benzene unloading crane pipe purging device according to claim 1, characterized in that: Check valve 1 (B2) is a swing type, and check valve 2 (B3) is a rising type.

5. A benzene unloading crane pipe purging device according to claim 1, characterized in that: The nitrogen inlet hose (B5) is connected by a DN25, CL150 quick connector, and the nitrogen exhaust hose (B11) is connected by a DN25, CL150 quick connector.

6. A benzene unloading crane pipe purging device according to claim 1, characterized in that: The online pressure gauge (B13) has the dual display function of local and remote transmission, and the online density meter (B15) has the dual display function of local and remote transmission.

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