System for airtight detection and residual liquid recovery of liquefied hydrocarbon loading arm

Abstract

The utility model belongs to the technical field of petrochemical engineering liquefied hydrocarbon loading safety and environmental protection, and particularly relates to a liquefied hydrocarbon loading arm airtightness detection and residual liquid recovery system. The system comprises a control system, a loading control assembly, a loading and unloading control assembly, an upper computer, a risk early warning system, an anti-explosion control box, a nitrogen filling assembly, a torch system and a crane pipe. The loading arm is provided with a root valve and a loading arm stop valve, the loading arm is connected with the under-pressure anti-explosion metal hose through a steel ball locking quick joint, the under-pressure anti-explosion metal hose is divided into two branches in the anti-explosion control box, one branch is that the under-pressure anti-explosion metal hose is connected with a torch system gas holder, and the other branch is connected with a nitrogen filling assembly. And automatic control can be carried out through a control system. The system provided by the utility model realizes the full-automatic detection of the gas tightness of the crane pipe during loading, loading and unloading of liquefied hydrocarbon, ensures the safety, reduces the workload of operators, recovers the residual liquid of the crane pipe, meets the environmental protection requirement, ensures the safety, and can check the detection data.

Description

Technical Field

[0001] The utility model belongs to the technical field of petrochemical liquefied hydrocarbon loading safety and environmental protection, and specifically relates to a system for liquefied hydrocarbon loading crane pipe air tightness detection and residual liquid recovery. Background Art

[0002] In recent years, accidents involving hazardous chemicals loading and unloading vehicles have occurred frequently, especially liquefied hydrocarbons, which are flammable and explosive hazardous chemicals. The loading and unloading vehicles are pressure loading and unloading vehicles, and the connection between the crane pipe and the pressure tank truck is required to be completely airtight. After the loading and unloading is completed, there is pressurized medium in a section of the crane pipe between the liquefied hydrocarbon crane pipe shut-off valve and the vehicle body shut-off valve. Currently, it can only be discharged on the spot, and the volume released after gasification is about 200 to 300 times. The "Notice on Strengthening Informatization Supervision of the Whole Process of Road Transport of Hazardous Chemicals" proposes to accelerate the process of inherent safety of loading and unloading operations, and requires that hazardous chemical production, storage and other enterprises involved in loading and unloading should install and use intelligent loading and unloading systems and interlocking control equipment for flammable liquids and liquefied hydrocarbon hazardous chemicals to eliminate dangerous working conditions, and monitor, warn and comprehensively evaluate the safety risks in the loading and unloading links of hazardous chemicals.

[0003] At present, the airtightness inspection of the crane pipe is only carried out regularly every six months or so, but each refining and petrochemical enterprise requires that the liquefied hydrocarbon loading and unloading vehicle must be inspected every time. The current technical means only use soapy water to spray on the quick connector of the crane pipe and the vehicle body, and manually observe the bubbles to judge whether the airtightness meets the requirements. In actual operation, due to the existence of human factors, such as inadequate observation or inadequate execution, hidden dangers are not observed. During the pressure loading and unloading process, the crane pipe quick connector may fall off or leak, causing serious accidents such as explosions and fires.

[0004] After the loading and unloading of liquefied hydrocarbons is completed, before the quick connector of the crane pipe is disassembled, the pressurized material remaining in the crane pipe needs to be released before the crane pipe can be put back in place. In fact, many companies discharge the residual liquid directly on the spot. On the one hand, this has safety hazards. During the material release process, the flow rate is very fast, and it is very easy to cause explosions and combustion accidents when encountering static electricity or sparks from the collision of the metal crane pipe; on the other hand, discharging it into the atmosphere will pollute the environment, fail to meet environmental protection requirements, and cause certain harm to the health of operators.

[0005] Therefore, how to solve the air tightness detection of the connection between the crane pipe and the vehicle body every time the vehicle is loaded and unloaded and how to reduce the discharge of residual liquid have become a difficult problem that technical personnel in the industry urgently need to solve. Utility Model Content

[0006] The problem to be solved by the utility model is to provide a system for gas tightness detection and residual liquid recovery of liquefied hydrocarbon loading crane pipes, which can realize automatic control. The technical solution adopted is:

[0007] A system for gas tightness detection and residual liquid recovery of a liquefied hydrocarbon loading crane pipe, comprising a control system, a loading control component, a loading and unloading control component, a host computer, a risk warning system, an explosion-proof control box, a nitrogen filling component, a flare system and a crane pipe;

[0008] The control system includes a display and alarm interface, which is provided with an air tightness detection start button, a residual liquid recovery start button, and an external speaker (which can output voice); the control system is connected to the loading control system, the loading and unloading control system and the host computer, and the host computer is connected to the risk warning system;

[0009] The host computer is installed with data acquisition software, and the risk warning system is installed with data processing and analysis software;

[0010] The crane pipe is provided with a root valve and a crane pipe cut-off valve. The crane pipe is connected to a pressurized explosion-proof metal hose through a steel ball locking quick connector. In the explosion-proof control box, the pressurized explosion-proof metal hose is divided into two branches. One branch is a pressurized explosion-proof metal hose connected to the flare system gas cabinet, and the other branch is connected to the nitrogen filling component.

[0011] Preferably, the crane pipe is connected to the tank truck connecting pipe via a dry-pull quick connector.

[0012] Preferably, the crane pipe is provided with a nozzle, the crane pipe cut-off valve is installed on the crane pipe, and a root valve is installed at the crane pipe nozzle.

[0013] Preferably, a tank truck shut-off valve is provided on the tank truck connecting pipe.

[0014] Preferably, a flare solenoid valve and a flare cut-off valve are arranged on the branch line connecting the pressurized explosion-proof metal hose to the flare system gas tank, and the flare system gas tank, the flare solenoid valve and the flare cut-off valve constitute the flare system.

[0015] Preferably, the flare solenoid valve is installed in an explosion-proof control box, and the flare cut-off valve is installed on a pipeline close to the gas cabinet of the flare system.

[0016] Preferably, the nitrogen filling assembly includes a nitrogen cylinder, a nitrogen solenoid valve, and a nitrogen shut-off valve, and a nitrogen solenoid valve and a nitrogen shut-off valve are arranged on a pipeline connecting the pressurized explosion-proof metal hose to the nitrogen cylinder.

[0017] Preferably, the nitrogen solenoid valve is installed in an explosion-proof control box, and the nitrogen shut-off valve is installed on a pipeline close to the nitrogen bottle.

[0018] Preferably, the control system is connected and controls the crane shut-off valve, the root valve, the flare solenoid valve, the flare shut-off valve, the nitrogen solenoid valve, and the nitrogen shut-off valve through wireless signals.

[0019] Preferably, a pressure transmitter is installed on the pipe section where the pressurized explosion-proof metal hose enters the explosion-proof control box.

[0020] When in use, when the liquefied hydrocarbon pressure tank truck is parked in place, the loading crane pipe is connected to the tank truck dry-pull quick connector, and other loading requirements are also met according to the actual situation. The pressurized explosion-proof metal hose used for air tightness detection and residual liquid recovery is connected to the crane pipe through a steel ball locking quick connector, and the control system sends a signal that can be used for air tightness detection;

[0021] Open the root valve 11 at the crane pipe end; observe the on-site operation display and alarm interface, and press the airtightness detection start button, observe the display and alarm interface 1, the control system automatically opens the nitrogen solenoid valve first, pressurizes the crane pipe, and the pressure transmitter detects the pressure change. When the pressure is charged to a certain set value, the nitrogen solenoid valve is closed, and the pressure holding time starts. The display and alarm interface will display the pressure holding time. When the pressure holding time is reached, the system automatically determines whether the airtightness meets the requirements based on the pressure drop data, and displays it on the display and alarm interface, and uploads the data to the host computer. The data acquisition software in the host computer collects the data, and then the data processing and analysis software installed in the risk warning system analyzes it (if there is a risk in the analysis data, a warning signal will be issued, and the usual practice of the prior art is adopted), and records are made for query;

[0022] The control system opens the flare cut-off valve, releases the flare with nitrogen for pressure maintenance, and voice reminds the operator that the airtightness test is over. If the airtightness test meets the requirements, the control system gives a signal to the loading control system to allow loading;

[0023] The control system voice reminds you to close the root valve at the crane tube end.

[0024] After the airtightness test before loading is completed, the loading phase begins. After loading is completed, the loading control system gives the control system a loading completion signal, and the control system voice reminds the on-site operator that residual liquid needs to be recovered;

[0025] Then open the root valve at the end of the crane pipe; press the residual liquid recovery start button, the control system will automatically open the flare solenoid valve first, use the vaporization pressure of the liquefied hydrocarbons to release the liquefied hydrocarbons to the flare, and then close the flare solenoid valve, open the nitrogen solenoid valve for purge and replacement, and purge it back and forth 3 to 5 times to clean it, and then close the nitrogen solenoid valve and the flare solenoid valve (the flare shut-off valve and the nitrogen shut-off valve are the root valves of the corresponding pipelines, which are normally open, so they do not need to be opened in advance during actual use).

[0026] Historical data is uploaded to the host computer and risk warning system.

[0027] Similar to the prior art, the utility model is beneficial in that:

[0028] First, it solves the problem that the air tightness detection of the crane pipe of the liquefied hydrocarbon loading and unloading vehicle depends entirely on manual judgment, and realizes fully automatic detection, which ensures safety and reduces the workload of operators;

[0029] Second, it solves the problem of on-site discharge of residual liquid from the crane pipe of liquefied hydrocarbon loading and unloading vehicles, realizes fully automatic discharge and purge, meets environmental protection requirements and ensures safety;

[0030] Third, it realizes full automatic control, solves the problem of full manual operation on site, and realizes data upload and historical record query. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a system structure diagram for gas tightness detection and residual liquid recovery of liquefied hydrocarbon loading crane pipes.

[0032] In the figure, 1. display and alarm interface, 2. air tightness detection start button, 3. residual liquid recovery start button, 4. horn, 5. crane pipe, 6. crane pipe cut-off valve, 7. nozzle, 8. dry pull-out quick connector, 9. tank truck cut-off valve, 10. tank truck, 11. root valve, 12. steel ball locking quick connector, 13. pressurized explosion-proof metal hose, 14. flare solenoid valve, 15. nitrogen solenoid valve, 16. flare cut-off valve, 17. nitrogen cut-off valve, 18. pressure transmitter, 19. explosion-proof control box. DETAILED DESCRIPTION

[0033] The drawings are for illustrative purposes only; the dimensions in the drawings do not represent the actual dimensions of the products but are for ease of explanation only. Solid lines are pipelines or connecting lines, and dotted lines are signal lines.

[0034] The utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0035] like Figure 1 As shown, a system for gas tightness detection and residual liquid recovery of a liquefied hydrocarbon loading crane pipe includes a control system, a loading control component, a loading and unloading control component, a host computer, a risk warning system, an explosion-proof control box 19, a nitrogen filling component, a flare system and a crane pipe 5;

[0036] The control system includes a display and alarm interface 1, which is provided with an air tightness detection start button 2, a residual liquid recovery start button 3, and an external speaker 4; the control system is connected to the loading control system, the loading and unloading control system and the host computer, and the host computer is connected to the risk warning system;

[0037] The host computer is installed with data acquisition software, and the risk warning system is installed with data processing and analysis software; the host computer is a device at the industrial control network layer, and the risk warning system is a device at the production management layer.

[0038] The crane pipe 5 is provided with a root valve 11 and a crane pipe cut-off valve 6. The crane pipe 5 is connected to a pressurized explosion-proof metal hose 13 through a steel ball locking quick connector 12. In the explosion-proof control box 19, the pressurized explosion-proof metal hose 13 is divided into two branches. One branch is the pressurized explosion-proof metal hose 13 connected to the flare system gas cabinet, and the other branch is connected to the nitrogen filling component.

[0039] The crane pipe 5 is connected to the tank truck 10 connecting pipe through a dry pull-out quick connector 8, the crane pipe 5 is provided with a nozzle 7, the crane pipe cut-off valve 6 is installed on the crane pipe 5, and a root valve 11 is installed at the crane pipe nozzle 7. A tank truck cut-off valve 9 is provided on the tank truck 10 connecting pipe. The tank truck cut-off valve 9 is also manually controlled.

[0040] The pressurized explosion-proof metal hose 13 shown is connected to the branch line of the flare system gas cabinet, and a flare release solenoid valve 14 and a flare release cut-off valve 16 are set to form a flare system; the flare release solenoid valve 14 is installed in an explosion-proof control box 19, and the flare release cut-off valve 16 is installed on the pipeline close to the flare system gas cabinet.

[0041] A nitrogen solenoid valve 15 and a nitrogen shut-off valve 17 are also provided on the pipeline connecting the pressurized explosion-proof metal hose 13 to the nitrogen filling assembly. The nitrogen solenoid valve 15 is installed in an explosion-proof control box 19 .

[0042] The control system is connected and controlled by wireless signals to the flare solenoid valve 14 and the nitrogen solenoid valve 15. A pressure transmitter 18 is installed on the pipe section where the pressurized explosion-proof metal hose 13 enters the explosion-proof control box 19.

[0043] The method for using the system of the utility model comprises the following steps:

[0044] (1) The liquefied hydrocarbon pressure tank truck is parked in place; the control system sets the pressure value P; the pressure holding time is T;

[0045] (2) The loading crane pipe 5 is securely connected to the tank truck 10, and other loading requirements are also met. The pressurized explosion-proof metal hose 13 for air tightness detection and residual liquid recovery is connected to the crane pipe 5 through the steel ball locking quick connector 12;

[0046] (3) The control system sends an airtight detection signal;

[0047] (4) Open the root valve 11 at the crane end;

[0048] (5) After the conditions are met, observe the display and alarm interface 1 of the on-site operation, press the airtightness detection start button 2, and then observe the display and alarm interface 1. The control system automatically opens the nitrogen solenoid valve 15 to charge the crane pipe 5. The pressure transmitter 18 detects the pressure change. When the pressure reaches P, the nitrogen solenoid valve 15 is closed, and the pressure holding time starts. The display and alarm interface 1 will display the pressure holding time. When the pressure holding time T is reached, the control system automatically determines whether the airtightness meets the requirements based on the pressure drop data, and displays it on the display and alarm interface 1, and uploads the data to the host computer. The data acquisition software in the host computer collects the data, and then the data processing and analysis software installed in the risk warning system analyzes whether there is a risk;

[0049] The control system opens the flare cut-off valve 16, releases the flare with nitrogen for pressure maintenance, and voice reminds the operator that the airtightness test is over; if the airtightness test meets the requirements, the control system gives a loading control system a signal to allow loading;

[0050] (6) The control system voice reminds you to close the root valve 11 at the crane end, and then closes it manually;

[0051] (7) After the airtightness test before loading is completed, the loading process begins. After the loading is completed, the loading control system gives the control system a loading completion signal, and the control system voice reminds the on-site operator that residual liquid needs to be recovered;

[0052] (8) Open the root valve 11 at the crane end;

[0053] (9) Press the residual liquid recovery start button 3, the control system automatically opens the flare solenoid valve 14, uses the vaporization pressure of the liquefied hydrocarbon to release the liquefied hydrocarbon to the flare, then closes the flare solenoid valve 14, opens the nitrogen solenoid valve 15 for replacement, and blows back and forth three times to clean it, and then closes the nitrogen solenoid valve 15 and the flare solenoid valve 14;

[0054] (10) Historical data is uploaded to the host computer, and then the risk warning system analyzes it to determine whether there is a risk and take corresponding measures, and then records it and saves it.

[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connection" and the like should be understood in a broad sense. If the connection method is not specifically stated, conventional means such as bolts, rivets, welding, etc. in the prior art are adopted. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid, including a control system, characterized in that: It also includes loading control components, loading and unloading control components, host computer, risk warning system, explosion-proof control box, nitrogen filling components, flare system and crane pipe; The control system includes a display and alarm interface, which is provided with an air tightness detection start button, a residual liquid recovery start button, and an external speaker; the control system is connected to the loading control system, the loading and unloading control system and the host computer, and the host computer is connected to the risk warning system; The host computer is installed with data acquisition software, and the risk warning system is installed with data processing and analysis software; The crane pipe is provided with a root valve and a crane pipe cut-off valve. The crane pipe is connected to a pressurized explosion-proof metal hose through a steel ball locking quick connector. In the explosion-proof control box, the pressurized explosion-proof metal hose is divided into two branches. One branch is a pressurized explosion-proof metal hose connected to the flare system gas cabinet, and the other branch is connected to the nitrogen filling assembly.

2. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 1, characterized in that: The crane pipe is connected to the tank truck connecting pipe through a dry pull-out quick connector.

3. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 2, characterized in that: The crane pipe is provided with a nozzle, the crane pipe cut-off valve is installed on the crane pipe, and a root valve is installed at the nozzle of the crane pipe.

4. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 2, characterized in that: A tank truck shut-off valve is provided on the tank truck connecting pipe.

5. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 1, characterized in that: A flare solenoid valve and a flare cut-off valve are arranged on the branch line of the pressurized explosion-proof metal hose connected to the flare system gas tank. The flare system gas tank, the flare solenoid valve and the flare cut-off valve constitute the flare system.

6. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 5, characterized in that: The flare-release solenoid valve is installed in an explosion-proof control box, and the flare-release cut-off valve is installed on a pipeline close to the gas cabinet of the flare system.

7. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 1, characterized in that: The nitrogen filling assembly comprises a nitrogen cylinder, a nitrogen solenoid valve and a nitrogen shut-off valve. The nitrogen solenoid valve and the nitrogen shut-off valve are arranged on a pipeline connecting the pressurized explosion-proof metal hose to the nitrogen cylinder.

8. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 7, characterized in that: The nitrogen solenoid valve is installed in an explosion-proof control box, and the nitrogen cut-off valve is installed on a pipeline close to the nitrogen bottle.

9. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to any one of claims 3 to 8, characterized in that: The control system is connected and controlled by wireless signals to the flare solenoid valve, flare cut-off valve, and nitrogen solenoid valve. The crane cut-off valve, root valve, and nitrogen cut-off valve are all manually controlled.

10. A system for detecting gas tightness of a liquefied hydrocarbon loading crane and recovering residual liquid according to claim 1, characterized in that: Install a pressure transmitter on the pipe section where the pressurized explosion-proof metal hose enters the explosion-proof control box.

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