Protection device of carbon disulfide loading system
By designing a protective device including loading pipelines, gas-phase pipelines, buffer tanks and pressure transmitters in the carbon disulfide loading system, the pressure increase problem caused by flow control failure during loading is solved, and the safety and stability of the system are achieved.
Patent Information
- Application Number
- CN202421671230.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-15
AI Technical Summary
During the loading process of carbon disulfide, the failure of flow control causes the pressure in the tank vehicle to increase sharply, which may lead to the risk of safety valve jumping, the pressure of the loading pipeline increases and the risk of pump damage.
A protective device including loading pipes, gas-phase pipes, buffer tanks and pressure transmitters is designed. The pressure of the loading pipeline is detected by a pressure transmitter, the first and second control valves are controlled to buffer excess carbon disulfide, prevent excessive pressure from being too high, and discharge pressure to the gas phase pipeline through the safety valve and the check valve.
It effectively reduces the pressure of loading pumps and loading pipelines, avoids the risk of pump damage and pipeline rupture, and ensures the safety of loading system.
Smart Images
Figure CN222798697U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical industry, in particular to a protective device for a carbon disulfide loading system. Background Art
[0002] Carbon disulfide produced by chemical companies is fed into tank trucks through the loading system. At present, during the loading process of carbon disulfide, when the carbon disulfide loading flow control fails and the tuning fork switch in the gas phase pipeline of the loading system detects liquid carbon disulfide, the pressure in the tank truck increases sharply, causing the tank truck safety valve to trip, and causing the carbon disulfide loading pipeline pressure to increase, and the pump outlet pressure to increase, there is a risk of pump damage and pipeline rupture, and there are great safety hazards.
[0003] Therefore, how to design a safe and reliable carbon disulfide loading protection device is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention
[0004] The purpose of the utility model is to provide a protective device for a carbon disulfide loading system in view of the deficiencies in the prior art. The device has a simple structure and low maintenance cost, and can avoid excessive pressure in the loading pipeline of the carbon disulfide loading system or excessive pressure at the pump outlet, thereby ensuring the safety of the loading system.
[0005] The technical scheme of the utility model is: a protective device for a carbon disulfide loading system, comprising a loading pipeline and a gas phase pipeline, wherein the upstream end of the loading pipeline is used to be connected to a carbon disulfide source, a loading crane pipe is arranged at the downstream end to be connected to a feed port of a tank truck, a loading pump and a first control valve are arranged on the loading pipeline, and the first control valve is located downstream of the loading pump, a pressure relief crane pipe is arranged at the upstream end of the gas phase pipeline to be connected to a pressure relief port of the tank truck, a tuning fork switch is arranged at the upstream end of the gas phase pipeline, and further comprises a circulation pipeline, a buffer tank, A pressure transmitter is provided on the loading pipeline and is located downstream of the first control valve. The buffer tank is connected to the loading pipeline and is located between the loading pump and the first control valve. A safety valve and a one-way valve are arranged in series on the top of the buffer tank and are connected to the gas phase pipeline. The upstream end of the circulation pipeline is connected to the bottom of the buffer tank, and the downstream end is connected to the carbon disulfide source. A second control valve is arranged on the circulation pipeline. The first control valve is normally open and the second control valve is normally closed, and both are connected to the pressure transmitter through the central control room.
[0006] A nitrogen inlet is arranged on the loading pipeline and is connected to a nitrogen source through a control valve. The nitrogen inlet is located between the first control valve and the loading crane pipe.
[0007] A manual valve and a flow meter are arranged on the loading pipeline, and are located between the buffer tank and the first control valve.
[0008] The first control valve and the second control valve are both pneumatic control valves.
[0009] A shower valve is arranged at the bottom of the buffer tank.
[0010] The above technical solution has the following beneficial effects:
[0011] 1. The protection device of the carbon disulfide loading system includes a loading pipeline and a gas phase pipeline, wherein the loading pipeline is used to provide carbon disulfide to the tank truck, and the gas phase pipeline is used to discharge the carbon disulfide vapor generated in the tank truck to the tail gas treatment unit to avoid environmental pollution. The upstream end of the loading pipeline is used to connect to the carbon disulfide source, and the downstream end is provided with a loading crane pipe for connecting to the feed port of the tank truck. The loading pipeline is provided with a loading pump and a first control valve, and the first control valve is located downstream of the loading pump. When the carbon disulfide loading system is in the working state, the first control valve is in the normally open state, and the rest of the states are closed. A pressure relief crane pipe is provided at the upstream end of the gas phase pipeline to connect to the pressure relief port of the tank truck, and a tuning fork switch is provided at the upstream end of the gas phase pipeline. When liquid carbon disulfide is detected, the tank truck safety valve is triggered to ensure the safety of the tank truck. It also includes a circulation pipeline, a buffer tank, and a pressure transmitter. The pressure transmitter is arranged on the loading pipeline and is located downstream of the first control valve. The pressure transmitter is used to detect the pressure at the downstream end of the loading pipeline. When carbon disulfide is transported normally, the pressure value detected by the pressure transmitter is within the design range. The buffer tank is connected to the loading pipeline and is located between the loading pump and the first control valve. A safety valve and a one-way valve are arranged in series on the top of the buffer tank and are connected to the gas phase pipeline. The upstream end of the circulation pipeline is connected to the bottom of the buffer tank, and the downstream end is connected to the carbon disulfide source. A second control valve is arranged on the circulation pipeline. The first control valve is normally open and the second control valve is normally closed. Both are connected to the pressure transmitter through the central control room. When the carbon disulfide loading flow control fails, resulting in the tank truck being filled with carbon disulfide and overflowing, the pressure in the tank truck is The force increases, and the pressure in the connected loading pipeline increases. The pressure detected by the pressure transmitter is overpressure, and a signal is sent to control the first control valve to close and the second control valve to open. The buffer tank can buffer the pressure change caused by the temporary excessive carbon disulfide entering the loading pipeline, and when the situation is serious, the pressure can be relieved to the gas phase pipeline through the safety valve and the one-way valve. At the same time, in conjunction with the circulation pipeline, the excess carbon disulfide can be refluxed to the carbon disulfide source, which can effectively reduce the pressure of the loading pump and loading pipeline, and effectively eliminate the risk of pump damage and pipeline rupture.
[0012] 2. A nitrogen inlet is provided on the loading pipeline and is connected to the nitrogen source through a control valve. The nitrogen inlet is located between the first control valve and the loading crane pipe. Before the loading system is operated, nitrogen is first injected into the tank truck through the nitrogen inlet to replace the air in the tank truck to ensure the quality and safety of carbon disulfide during long-term transportation.
[0013] 3. A drain valve is installed at the bottom of the buffer tank to drain the residual carbon disulfide in the buffer tank and ensure the safety of the loading system.
[0014] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a connection diagram of the utility model.
[0016] In the attached drawings, 1 is a loading pipeline, 2 is a gas phase pipeline, 3 is a loading pump, 4 is a first control valve, 5 is a circulation pipeline, 6 is a buffer tank, 7 is a pressure transmitter, 8 is a safety valve, 9 is a one-way valve, 10 is a second control valve, 11 is a nitrogen inlet, 12 is a manual valve, 13 is a flow meter, and 14 is a shower valve. DETAILED DESCRIPTION
[0017] See also Figure 1 , which is a specific embodiment of a protective device for a carbon disulfide loading system. The protective device for a carbon disulfide loading system includes a loading pipeline 1 and a gas phase pipeline 2. The upstream end of the loading pipeline 1 is used to connect to a carbon disulfide source, and a loading crane is provided at the downstream end to connect to the feed port of a tank truck. A loading pump 3 and a first control valve 4 are provided on the loading pipeline 1, and the first control valve 4 is located downstream of the loading pump 3. The first control valve usually adopts a pneumatic control valve. A pressure relief crane is provided at the upstream end of the gas phase pipeline 2 to connect to the pressure relief port of the tank truck, and a tuning fork switch is provided at the upstream end of the gas phase pipeline 2. These structures are conventional equipment of chemical enterprises. It also includes a circulation pipeline 5, a buffer tank 6, and a pressure transmitter 7. The pressure transmitter 7 is provided on the loading pipeline 1, downstream of the first control valve 4. The buffer tank 6 is connected to the loading pipeline 1, and is located between the loading pump 3 and the first control valve 4. The top of the buffer tank 6 is provided with a safety valve 8 and a one-way valve 9 in series, and is connected to the gas phase pipeline 2. Usually, a guide valve 14 is provided at the bottom of the buffer tank 6. The upstream end of the circulation pipeline 5 is connected to the bottom of the buffer tank 6, and the downstream end is connected to the carbon disulfide source. The circulation pipeline 5 is provided with a second control valve 10, and usually, the second control valve also adopts a pneumatic control valve. The first control valve 4 is normally open, and the second control valve 10 is normally closed, and both are connected to the pressure transmitter 7 through the central control room.
[0018] Furthermore, a nitrogen inlet 11 is provided on the loading pipeline 1 and is connected to a nitrogen source through a control valve. The nitrogen inlet 11 is located between the first control valve 4 and the loading crane pipe. In addition, a manual valve 12 and a flow meter 13 are provided on the loading pipeline 1 and are located between the buffer tank 6 and the first control valve 4.
[0019] The working principle of the utility model is: first replace the air in the tank truck through the nitrogen inlet. Under normal circumstances, liquid carbon disulfide is injected into the tank truck through the loading pipeline, loading pump, and loading crane, and the extruded nitrogen (including a small amount of carbon disulfide gas phase) is discharged to the tail gas treatment unit through the gas phase pipeline for treatment. When the calibrated flow of carbon disulfide is injected, the loading pump stops and the first control valve is closed. When the carbon disulfide loading flow control fails, excessive carbon disulfide is injected into the tank truck, which will cause the pressure in the tank truck to increase. After the pressure transmitter detects overpressure, the first control valve is closed and the second control valve is opened to allow the excess carbon disulfide to flow back to the carbon disulfide source. If the pressure is seriously overpressured, the safety valve and the one-way valve of the buffer tank can also be used to release the pressure to the gas phase pipeline to ensure system safety.
Claims
1. A protective device for a carbon disulfide loading system, comprising a loading pipeline (1) and a gas phase pipeline (2), wherein the upstream end of the loading pipeline (1) is used to be connected to a carbon disulfide source, and a loading crane is provided at the downstream end to be connected to a feed port of a tank truck, a loading pump (3) and a first control valve (4) are provided on the loading pipeline (1), and the first control valve (4) is located downstream of the loading pump (3), a pressure relief crane is provided at the upstream end of the gas phase pipeline (2) to be connected to a pressure relief port of the tank truck, and a tuning fork switch is provided at the upstream end of the gas phase pipeline (2), characterized in that: It also includes a circulation pipeline (5), a buffer tank (6), and a pressure transmitter (7). The pressure transmitter (7) is arranged on the loading pipeline (1) and is located downstream of the first control valve (4). The buffer tank (6) is connected to the loading pipeline (1) and is located between the loading pump (3) and the first control valve (4). A safety valve (8) and a one-way valve (9) are arranged in series on the top of the buffer tank (6) and are connected to the gas phase pipeline (2). The upstream end of the circulation pipeline (5) is connected to the bottom of the buffer tank (6), and the downstream end is connected to the carbon disulfide source. A second control valve (10) is arranged on the circulation pipeline (5). The first control valve (4) is normally open, and the second control valve (10) is normally closed. Both are connected to the pressure transmitter (7) through the central control room.
2. The protective device for the carbon disulfide loading system according to claim 1, characterized in that: The loading pipeline (1) is provided with a nitrogen inlet (11) which is connected to a nitrogen source via a control valve. The nitrogen inlet (11) is located between the first control valve (4) and the loading crane pipe.
3. The protective device for the carbon disulfide loading system according to claim 1, characterized in that: The loading pipeline (1) is provided with a manual valve (12) and a flow meter (13), which are located between the buffer tank (6) and the first control valve (4).
4. The protective device for the carbon disulfide loading system according to claim 1, characterized in that: The first control valve (4) and the second control valve (10) are both pneumatic control valves.
5. The protective device for the carbon disulfide loading system according to claim 1, characterized in that: A shower valve (14) is provided at the bottom of the buffer tank (6).