BOG recovery device
By designing a BOG recovery device that includes a compressor, heat exchanger, and sensors, the problems of inefficient monitoring and safety of existing equipment have been solved, and the safe and efficient recovery of gas inside LNG tank trucks has been achieved.
Patent Information
- Application Number
- CN202421187344.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-28
AI Technical Summary
Existing BOG recovery equipment lacks monitoring of key sensitive parameters such as gas pressure and temperature, posing safety hazards and failing to efficiently recover residual gas inside LNG tank trucks.
Design a BOG recovery device that includes parallel recovery mechanisms, an alarm system, and a control system. It utilizes a compressor for pressurization, a heat exchanger for cooling, and an oil-water separator for impurity separation. The device also monitors gas parameters in real time through sensors and an alarm system to achieve a safe and reliable recovery process.
It improves work efficiency, ensures safety, avoids the hidden dangers of excessively high gas temperatures, achieves efficient gas separation and monitoring, and reduces resource waste.
Smart Images
Figure CN222335135U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of natural gas recovery equipment, in particular to a BOG recovery device. Background Art
[0002] With the existing LNG unloading technology, after the LNG tank truck is unloaded, there will inevitably be residual LNG liquid and 0.3-0.5Mpa gaseous natural gas (BOG) in the tank. Before the LNG tank truck is filled with new LNG, this gas-liquid mixture needs to be discharged to achieve safe loading conditions. If it is discharged into the air, there will inevitably be safety hazards and waste of resources.
[0003] The existing BOG recovery equipment and technology cannot meet the requirements of efficient and safe recovery. They simply adopt a pump suction structure without any safety linkage control.
[0004] Therefore, in order to solve the above problems, the utility model provides a BOG recovery device. Utility Model Content
[0005] In order to overcome the above-mentioned deficiencies of the prior art and solve the problem that the existing BOG recovery equipment is only a simple pump suction structure and cannot monitor key sensitive parameters such as gas pressure and temperature, thus posing potential safety hazards, the utility model provides a BOG recovery device, and the specific technical solution is as follows:
[0006] A BOG recovery device is used to be installed at the outlet of a vaporizer connected to an LNG tanker, and comprises two sets of recovery mechanisms, an alarm system and a control system arranged in parallel; the recovery mechanism comprises an air inlet, a compressor, a heat exchange box, an exhaust pipe and a sewage pipe; one end of the air inlet is connected to the outlet of the vaporizer, and the other end is connected to the inlet of the compressor through the air inlet pipe; the compressor outlet is connected to the inlet of the heat exchange box through a cooling pipe; the outlet of the heat exchange box is connected to the inlet of the sewage pipe and the inlet of the exhaust pipe, and a medium-pressure outlet is arranged at the outlet of the exhaust pipe, and the medium-pressure outlet is connected to a municipal medium-pressure pipe.
[0007] Preferably, the compressor is driven by a driving motor to perform piston motion.
[0008] Preferably, a heat dissipation fan is provided on the top of the heat exchange box.
[0009] Preferably, the exhaust pipe is provided with an oil-water separator, a flow meter, a stop valve and a one-way valve in sequence from the inlet end to the outlet end.
[0010] Preferably, the oil-water separator is connected to the sewage pipe through a waste discharge branch pipe.
[0011] Also preferably, it further includes a first pressure sensor, a second pressure sensor, a first temperature sensor and a second temperature sensor; the first pressure sensor and the first temperature sensor are arranged on the intake pipe; the second pressure sensor and the second temperature sensor are arranged on the exhaust pipe.
[0012] Also preferably, a self-operated pressure regulating valve is provided on one side of the exhaust pipe close to the medium-pressure outlet.
[0013] Further preferably, the outlet of the sewage pipe is provided with an automatic sewage outlet.
[0014] Still further preferably, a manual drain valve is provided at the outlet of the heat exchange box and the inlet of the drain pipe.
[0015] More preferably, the alarm system, the first pressure sensor, the second pressure sensor, the first temperature sensor, the second temperature sensor, the oil-water separator, the flow meter and the automatic sewage outlet are all electrically connected to the control system.
[0016] The beneficial effects of the utility model are:
[0017] 1. The utility model can recover two LNG tank trucks at the same time by setting two sets of parallel recovery mechanisms, effectively improving work efficiency;
[0018] 2. The utility model uses a one-way compressor to perform piston movement to pressurize the gasified natural gas in the LNG tanker to achieve the purpose of extraction and discharge;
[0019] 3. The utility model can effectively perform heat exchange treatment on the gas pressurized by the compressor by setting a heat exchange box and a cooling fan, thereby avoiding the safety hazard caused by excessively high gas temperature;
[0020] 4. The utility model can effectively separate the impurities in the extracted gas by setting up an oil-water separator and a sewage pipe, and perform sewage treatment in two forms: manual or automatic;
[0021] 5. The utility model can monitor the temperature and pressure of the intake and exhaust ducts in real time by setting pressure sensors, temperature sensors and alarm systems, thus avoiding potential safety hazards and achieving higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings constituting the specification of this application are used to provide further understanding of this application and do not constitute improper limitations on this application.
[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0024] In the figure, 1-air inlet; 11-air inlet pipe; 12-compressor; 121-drive motor; 13-cooling pipe; 14-heat exchange box; 141-cooling fan; 2-exhaust pipe; 21-oil-water separator; 22-flow meter; 23-stop valve; 24-check valve; 25-self-operated pressure regulating valve; 3-drain pipe; 31-automatic drain outlet. DETAILED DESCRIPTION
[0025] The specific implementation of a BOG recovery device provided by the utility model is further described in conjunction with the drawings and embodiments.
[0026] like Figure 1 As shown, a BOG recovery device is used to be installed at the outlet of a vaporizer connected to an LNG tank truck, and includes two sets of recovery mechanisms, an alarm system and a control system arranged in parallel; wherein the recovery mechanism includes an air inlet 1, a compressor 12, a heat exchange box 14, an exhaust pipe 2 and a sewage pipe 3; one end of the air inlet 1 is connected to the outlet of the vaporizer, and the other end is connected to the inlet of the compressor 12 through the air inlet pipe 11; the outlet of the compressor 12 is connected to the inlet of the heat exchange box 14 through the cooling pipe 13; the outlet of the heat exchange box 14 is connected to the inlet of the exhaust pipe 2 and the inlet of the sewage pipe 3; preferably, a medium-pressure outlet is also provided at the outlet of the exhaust pipe 2, and the medium-pressure outlet is connected to the municipal medium-pressure pipeline, thereby completing the connection between the recovery system and the municipal pipeline.
[0027] Preferably, the compressor 12 is driven by the driving motor 121 to perform piston motion. It is worth noting that the interior of the compressor 12 is a one-way structure, and the compressor 12 performs piston motion to pressurize the BOG in the LNG tanker to achieve the purpose of discharge.
[0028] Preferably, a heat dissipation fan 141 is disposed on the top of the heat exchange box 14 , and the BOG gas is pressurized by the compressor 12 and then flows through the heat exchange box 14 by capillary flow, and is further heat exchanged and cooled in combination with the heat dissipation fan 141 .
[0029] Preferably, the exhaust pipe 2 is provided with an oil-water separator 21, a flow meter 22, a stop valve 23 and a one-way valve 24 (to prevent gas backflow) in sequence from the inlet end to the outlet end;
[0030] Preferably, a manual drain valve is also provided between the outlet of the heat exchange box 14 and the inlet of the drain pipe 3, and the oil-water separator 21 is also connected to the drain pipe 3 through a drainage branch pipe. The device can separate impurities and discharge them through the oil-water separator 21, and can also discharge the debris in the entire device regularly by manually opening the manual drain valve; after removing the impurities, the clean gas will be measured by the flow meter 22 and finally discharged into the municipal medium-pressure pipeline.
[0031] Also preferably, the utility model further includes a first pressure sensor, a second pressure sensor, a first temperature sensor and a second temperature sensor; the first pressure sensor and the first temperature sensor are arranged on the intake pipe 11; the second pressure sensor and the second temperature sensor are arranged on the exhaust pipe 2.
[0032] Preferably, a self-operated pressure regulating valve 25 is provided on one side of the exhaust pipe 2 close to the medium-pressure outlet, and the output pressure can be adjusted according to the safety of the pipeline system and the design parameters of each component.
[0033] Further preferably, the outlet of the sewage pipe 3 is provided with an automatic sewage outlet 31 , which can realize regular and automatic discharge and cleaning of residual impurities in the sewage pipe 3 .
[0034] It is worth noting that the alarm system, the first pressure sensor, the second pressure sensor, the first temperature sensor, the second temperature sensor, the oil-water separator 21, the flow meter 22 and the automatic sewage outlet 31 in the utility model are all electrically connected to the control system to realize automatic linkage control.
[0035] When the intake pipe pressure is ≤0.1Mpa and the intake pipe temperature is ≥60℃, the first pressure sensor and the first temperature sensor will transmit data to the control system, and the alarm system will issue a warning; when the exhaust pipe pressure value is ≥0.65Mpa and the exhaust pipe temperature is ≥145℃, the second pressure sensor and the second temperature sensor will transmit data to the control system, and the alarm system will issue a warning to remind the staff to stop the operation of the device in time to avoid safety accidents.
[0036] The utility model can perform the recovery work of two LNG tank trucks at the same time by arranging two sets of parallel recovery mechanisms, thereby effectively improving the work efficiency; the utility model pressurizes the gasified natural gas in the LNG tank truck by using the piston movement of the compressor with a one-way structure inside, so as to achieve the purpose of gas extraction and discharge; the utility model can effectively perform heat exchange treatment on the gas pressurized by the compressor by arranging a heat exchange box and a cooling fan, thereby avoiding the safety hazard caused by excessive temperature; the utility model can effectively separate the impurities in the extracted gas by arranging an oil-water separator and a sewage pipe, and perform sewage treatment in manual or automatic forms; the utility model can also monitor the temperature and pressure of the intake pipe and the exhaust pipe in real time by arranging a pressure sensor, a temperature sensor and an alarm system, thereby enhancing safety and reliability.
[0037] In the present utility model, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or components of the present utility model. They do not specifically refer to the parts or components of the present utility model and cannot be understood as limitations on the present utility model. Terms such as "connected" and "connected" should be understood in a broad sense, indicating that they can be fixedly connected, integrally connected, or detachably connected; they can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances, and they cannot be understood as limitations on the present utility model.
[0038] 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 BOG recovery device, used to be installed at the outlet of a vaporizer connected to an LNG tanker, characterized in that: It includes two sets of recovery mechanisms, alarm systems and control systems arranged in parallel; the recovery mechanism includes an air inlet, a compressor, a heat exchange box, an exhaust pipe and a sewage pipe; One end of the air inlet is connected to the vaporizer outlet, and the other end is connected to the compressor inlet through an air inlet pipe; the compressor outlet is connected to the inlet of the heat exchange box through a cooling pipe; the outlet of the heat exchange box is connected to the inlet of the sewage pipe and the inlet of the exhaust pipe, and a medium-pressure air outlet is provided at the outlet of the exhaust pipe, and the medium-pressure air outlet is connected to the municipal medium-pressure pipeline.
2. The BOG recovery device according to claim 1, characterized in that: The compressor is driven by a driving motor to perform piston motion.
3. The BOG recovery device according to claim 1, characterized in that: A heat dissipation fan is arranged on the top of the heat exchange box.
4. The BOG recovery device according to claim 1, characterized in that: The exhaust pipe is provided with an oil-water separator, a flow meter, a stop valve and a one-way valve in sequence from the inlet end to the outlet end.
5. The BOG recovery device according to claim 4, characterized in that: The oil-water separator is connected to the sewage pipe through the impurity discharge branch pipe.
6. The BOG recovery device according to claim 5, characterized in that: Also includes a first pressure sensor, a second pressure sensor, a first temperature sensor, and a second temperature sensor; The first pressure sensor and the first temperature sensor are arranged on the intake pipe; the second pressure sensor and the second temperature sensor are arranged on the exhaust pipe.
7. The BOG recovery device according to claim 4, characterized in that: A self-operated pressure regulating valve is also provided on one side of the exhaust pipe close to the medium-pressure outlet.
8. The BOG recovery device according to claim 6, characterized in that: The outlet of the sewage pipe is provided with an automatic sewage outlet.
9. The BOG recovery device according to claim 1, characterized in that: Manual drain valves are also provided at the outlet of the heat exchange box and the inlet of the drain pipe.
10. The BOG recovery device according to claim 8, characterized in that: The alarm system, the first pressure sensor, the second pressure sensor, the first temperature sensor, the second temperature sensor, the oil-water separator, the flow meter and the automatic sewage outlet are all electrically connected to the control system.