A safe oil and gas recovery system for loading and unloading ships at docks and tank farms

Abstract

The utility model relates to a safe oil and gas recovery system for loading and unloading ships at a wharf and a tank area, comprising an oil tanker (1), an oil and gas collection system (2), a ship-shore safety device (3), an oil and gas transportation system (4), an oil and gas condensation recovery system (5), a liquid nitrogen storage and transportation system (6), a nitrogen recovery and utilization system (7), a condensate collection and transportation system (8), an oil product storage tank (9) and a standard discharge system (10). The oil tanker (1) is provided with an oil tanker feed port (101) and an oil and gas collection port (103), the nitrogen recovery and utilization system (7) is provided with a nitrogen inlet (701), a nitrogen outlet to the ship-shore safety device (702) and a nitrogen outlet to the oil product storage tank (704), and the oil product storage tank (9) is provided with a nitrogen sealing inlet (901) and a storage tank outlet (903). The oil product storage tank (9) has a high recovery rate, a low concentration of the exhaust gas, a low overall cost, simple operation and low operating expenses.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas safety recovery, and relates to an oil and gas safety recovery system, in particular to an oil and gas safety recovery system for loading and unloading ships at docks and tank areas using liquid nitrogen cold energy and nitrogen inerting functions. Background Art

[0002] Petroleum and its products are mixtures of various hydrocarbons, the light components of which are highly volatile.

[0003] At present, a large part of the oil transportation at home and abroad is completed by water transportation, and the land behind the dock is often equipped with oil tank areas. In order to ensure the safety and environmental protection of the loading and unloading process of oil tankers at the dock, my country has formulated standards such as "Safety Devices for Ship-Shore Oil and Gas Recovery at Docks" (JT / T 1333-2020), "Technical Specifications for the Construction of Oil and Gas Recovery and Treatment Facilities at Docks" (JTS / T196-12-2023), and "Emission Standards for Air Pollutants from Oil Storage Depots" (GB 20950-2020). At present, the oil and gas generated by loading is generally treated separately; the large breathing oil and gas generated in the land storage tank during unloading is also treated separately; the cabin inerting gas replenishment during unloading and the large breathing inerting gas replenishment of the storage tank during loading are also set separately. Generally, nitrogen generators are set up at the dock and tank area to provide nitrogen inerting gas. In addition, a combination of mechanical refrigeration, adsorption, and absorption is often used for oil and gas recovery. However, the temperature of mechanical refrigeration is not low enough, resulting in a low removal rate of oil and gas recovery. The separately set nitrogen generator also brings about an increase in investment and complexity of operation and management.

[0004] For example, Chinese patent CN 104406047 B discloses a safety system for collecting volatile organic gases during the loading process of oil tankers at a wharf. The system is provided with a nitrogen inerting pipeline, but the nitrogen supply method is not discussed. Chinese patents CN 105692541 B and CN 106628011 B disclose a safety device for oil and gas recovery at a wharf and a method for oil and gas recovery at a wharf. The device is provided with an inerting system; the inerting gas uses nitrogen or other gases, but the specific method for providing the inerting gas is not discussed. Chinese patent CN 213236976 U discloses a ship-shore interface safety device for oil and gas recovery at a wharf, which includes an inerting system, but does not discuss the type and supply method of the inert gas. Chinese patent CN 107270129 A discloses a mobile ship-shore safety interface device, which includes an inerting system, but does not mention the type and supply method of the inerting gas. Chinese patent CN 112391202 A discloses an integrated device for wharf storage tanks, ship inerting and oil and gas recovery. The device has an inert gas storage tank and an inert gas pipeline. The inert gas is the tail gas after the oil and gas are burned. The tail gas contains a large amount of carbon dioxide, which is corrosive and can cause pollution to certain materials. In addition, the volume of the inert gas storage tank will be very large, increasing investment and floor space. Chinese patent CN 107649011 A discloses a wharf oil and gas recovery engine device and a method of use. The device passes oil and gas into the engine for combustion, processes the oil and gas, and recovers the engine tail gas as inerting gas, but the engine tail gas contains a large amount of carbon dioxide, which is corrosive. Chinese patent CN 108998070 A discloses a crude oil loading oil and gas recovery method and recovery system, desulfurizing the collected oil and gas, and performing secondary activated carbon adsorption after desulfurization. The tail gas after adsorption and the oil and gas after activated carbon desorption are sent as boiler fuel, and the tail gas after combustion is vented. The heat generated heats the boiler water to produce steam. The system uses an open-flame boiler as a processing facility, which occupies a huge area and has poor safety. Chinese patent CN 112556446 B discloses an oil and gas condensation recovery system for a crude oil tanker and its working method, which compresses and expands the nitrogen contained in the oil and gas to obtain cold energy for the liquefaction of VOCs in the oil and gas. The device is complex, expensive and unstable in operation. Chinese patents CN 103463831B and CN 114699789 B disclose an oil and gas recovery device for a tanker terminal, which condenses and recovers oil and gas by mechanical refrigeration, but the condensation temperature is not low enough, the condensation recovery efficiency is not high enough, and the failure rate is high.Chinese patent CN111635777 B discloses a non-steady-state oil and gas recovery system, including an air intake system, a safety system, a primary condensation system, a secondary condensation system, a cryogenic heat exchange system, a primary ethylene glycol cooling system, a secondary ethylene glycol cooling system, an ethylene glycol storage and transportation system, a low-temperature oil and gas heating system, a low-temperature nitrogen heating system, a liquid nitrogen transportation and regulation system, a condensate recovery and transportation system, and a defrosting system, but does not fully discuss the use of nitrogen gasified from liquid nitrogen. Chinese patent CN 109178697 A discloses a joint station oil tank top gas and wharf oil and gas recovery system, which introduces a tank area and a water seal device, and recovers the volatile gas from the top of the oil tank and the oil tanker at the wharf while maintaining the pressure balance of each oil tank. After the volatile gas is filtered out of air and inert gas by an adsorption oil and gas recovery device, the condensate in the pipe is separated by a separator, enters the associated gas compressor for pressurization, and then passes through a natural gas dryer for cooling and cooling, and finally is supplied to the heating furnace for combustion. In the utility model, the dock is equipped with a nitrogen generator set, an inerting oil tank of an oil tanker and a system pressure balance, and the construction cost and the operation cost are relatively high.

[0005] In summary, the existing oil and gas safety and recovery systems for loading and unloading ships in the tank area of ​​the wharf have certain defects. Therefore, in view of the defects of the existing technology, it is urgent to develop a new type of oil and gas safety recovery system for loading and unloading ships in the tank area of ​​the wharf. Utility Model Content

[0006] The utility model aims to overcome the shortcomings of the prior art and provide a safe oil and gas recovery system for loading and unloading at docks and tank areas. The system uses liquid nitrogen as a cold source, has a low condensation temperature, and a high oil and gas recovery rate. The nitrogen generated by liquid nitrogen is comprehensively utilized for cabin inerting, ship-shore safety device inerting, and tank nitrogen sealing, with low investment and low operating costs.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A safe oil and gas recovery system for loading and unloading ships at docks and tank areas, comprising an oil tanker, characterized in that it also comprises an oil and gas collection system, a ship-shore safety device, an oil and gas transportation system, an oil and gas condensation recovery system, a liquid nitrogen storage and transportation system, a nitrogen recovery and utilization system, a condensate collection and transportation system, an oil product storage tank and a standard discharge system, wherein the oil tanker is provided with an oil tanker feed port and an oil and gas collection port, the nitrogen recovery and utilization system is provided with a nitrogen inlet, a nitrogen outlet to the ship-shore safety device and a nitrogen outlet to the oil product storage tank, the oil product storage tank is provided with a nitrogen sealing inlet and a storage tank outlet, wherein the storage tank outlet of the oil product storage tank is connected to the oil tanker feed port of the oil tanker The oil and gas collection port of the oil tanker is connected to the oil and gas collection system, the oil and gas collection system is connected to the ship-shore safety device, the ship-shore safety device is connected to the nitrogen outlet to the ship-shore safety device of the nitrogen recovery system and the oil and gas transportation system, the oil and gas transportation system is connected to the oil and gas condensation recovery system, the oil and gas condensation recovery system is connected to the liquid nitrogen storage and transportation system, the nitrogen inlet of the nitrogen recovery system, the condensate collection and transportation system and the standard emission system, and the nitrogen sealing inlet of the oil storage tank is connected to the nitrogen outlet to the oil storage tank of the nitrogen recovery system.

[0009] Preferably, the oil tanker is provided with an oil tanker discharge port, and the oil product storage tank is also provided with a tank inlet and an oil and gas outlet port, the oil tanker discharge port of the oil tanker is connected to the tank inlet port of the oil product storage tank, and the oil and gas outlet port of the oil product storage tank is connected to the oil and gas condensation recovery system.

[0010] Preferably, the oil tanker is further provided with an inert gas inlet, and the nitrogen recovery system is further provided with a nitrogen de-oiling ship outlet, and the nitrogen de-oiling ship outlet of the nitrogen recovery system is connected to the inert gas inlet of the oil tanker.

[0011] Compared with the prior art, the oil gas safety recovery system for loading and unloading ships at docks and tank farms of the utility model has one or more of the following beneficial technical effects:

[0012] 1. The utility model makes full use of the cold energy of liquid nitrogen to condense and recover VOCs, with low condensation temperature, high recovery rate and low exhaust gas concentration.

[0013] 2. The utility model makes full use of the nitrogen generated by the gasification of liquid nitrogen to supplement the inert gas for the ship-shore safety device, inerte the cabin, and inerte the top of the oil storage tank. The overall cost is low, the operation is simple, and the operating cost is low.

[0014] 3. The utility model can use the same oil and gas condensation recovery system for oil and gas recovery whether loading or unloading, and use the same nitrogen recovery and utilization system to provide inerting nitrogen for various nitrogen-using equipment, such as oil tankers, ship-shore safety devices, oil storage tanks, etc., with low overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural schematic diagram of a safe oil and gas recovery system for loading and unloading ships at a wharf and a tank area.

[0016] Figure 2 The utility model is a schematic diagram of an interface of an oil tanker of a dock and a tank area for loading and unloading oil and gas safety recovery system.

[0017] Figure 3 The utility model is a schematic diagram of an interface of a nitrogen recovery system of a safe oil and gas recovery system for loading and unloading ships at a wharf and a tank area.

[0018] Figure 4 The utility model is a schematic diagram of an interface of an oil storage tank of an oil gas safety recovery system for loading and unloading oil at a wharf and a tank farm.

[0019] In the figure, 1: oil tanker; 2: oil and gas collection system; 3: ship-shore safety device; 4: oil and gas transportation system; 5: oil and gas condensation recovery system; 6: liquid nitrogen storage and transportation system; 7: nitrogen recovery and utilization system; 8: condensate collection and transportation system; 9: oil product storage tank; 10: standard emission system; 101: oil tanker feed inlet; 102: oil tanker discharge port; 103: oil and gas collection port; 104: inert gas inlet; 701: nitrogen inlet; 702: nitrogen outlet to ship-shore safety device; 703: nitrogen outlet to oil tanker; 704: nitrogen outlet to oil product storage tank; 901: nitrogen sealing inlet; 902: storage tank feed inlet; 903: storage tank discharge port; 904: oil and gas outlet. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Figure 1 The schematic diagram of the structure of the oil gas safety recovery system for loading and unloading at the dock and tank area of ​​the utility model is shown. Figure 1 As shown, the oil and gas safety recovery system for loading and unloading ships in the tank area of ​​the terminal of the utility model includes an oil tanker 1, an oil and gas collection system 2, a ship-shore safety device 3, an oil and gas transportation system 4, an oil and gas condensation recovery system 5, a liquid nitrogen storage and transportation system 6, a nitrogen recovery and utilization system 7, a condensate collection and transportation system 8, an oil storage tank 9 and a standard emission system 10.

[0023] Among them, Figure 2 As shown, the oil tanker 1 is provided with an oil tanker feed port 101, an oil tanker discharge port 102, an oil and gas collection port 103 and an inert gas inlet port 104.

[0024] like Figure 3 As shown, the nitrogen recovery and utilization system 7 is provided with a nitrogen inlet 701, a nitrogen to ship and shore safety device outlet 702, a nitrogen to oil ship outlet 703 and a nitrogen to oil product storage tank outlet 704.

[0025] like Figure 4 As shown, the oil storage tank 9 is provided with a nitrogen sealing air inlet 901, a storage tank feed inlet 902, a storage tank discharge port 903 and an oil and gas outlet.

[0026] Wherein, the tank outlet 903 of the oil storage tank 9 is connected to the tanker feed port 101 of the oil tanker 1. The oil and gas collection port 103 of the oil tanker 1 is connected to the oil and gas collection system 2. The oil and gas collection system 2 is connected to the ship-shore safety device 3. The ship-shore safety device 3 is connected to the nitrogen to ship-shore safety device outlet 702 of the nitrogen recovery system 7 and the oil and gas transportation system 4. The oil and gas transportation system 4 is connected to the oil and gas condensation recovery system 5. The oil and gas condensation recovery system 5 is connected to the liquid nitrogen storage and transportation system 6, the nitrogen inlet 701 of the nitrogen recovery system 7, the condensate collection and transportation system 8 and the standard emission system 10. The nitrogen sealing air inlet 901 of the oil storage tank 9 is connected to the nitrogen to oil storage tank outlet 704 of the nitrogen recovery system 7.

[0027] Furthermore, the oil tanker outlet 102 of the oil tanker 1 is connected to the tank inlet 902 of the oil product storage tank 9. The oil gas outlet 904 of the oil product storage tank 9 is connected to the oil gas condensation recovery system 5.

[0028] Moreover, the nitrogen de-tanker outlet 703 of the nitrogen recovery and utilization system 7 is connected to the inert gas inlet 104 of the tanker 1 .

[0029] The oil gas safety recovery system for loading and unloading at a dock and a tank area of ​​the utility model can be used for loading and unloading the oil tanker 1 .

[0030] When the oil tanker 1 is loaded, that is, when the oil tanker 1 is loaded, the oil product enters the oil tanker inlet 101 of the oil tanker 1 from the tanker outlet 903 of the oil product storage tank 9, and the oil and gas are discharged from the oil and gas collection port 103 of the oil tanker 1. The discharged oil and gas are sent to the ship-shore safety device 3 through the oil and gas collection system 2. When the ship-shore safety device 3 detects that the oxygen in the oil and gas exceeds the standard, nitrogen is introduced from the nitrogen ship-shore device outlet 702 of the nitrogen recovery and utilization system 7 to inertize the oil and gas. The inerted safe oil and gas enter the oil and gas condensation recovery system 5 through the oil and gas transportation system 4. The liquid nitrogen stored in the liquid nitrogen storage and delivery system 6 enters the oil and gas condensation recovery system 5. The coldness of the liquid nitrogen in the partition heat exchanger condenses the VOCs in the oil and gas into condensate and enters the condensate collection and delivery system 8. The liquid nitrogen absorbs heat and gasifies into nitrogen and enters the nitrogen recovery and utilization system 7. The non-condensable tail gas after deep cooling and removal of VOCs enters the standard emission system 10. At the same time, the oil product is output from the oil product storage tank 9, causing the oil product storage tank 9 to inhale air. The nitrogen sealing air inlet 901 of the oil product storage tank 9 is connected to the nitrogen oil product storage tank outlet 704 of the nitrogen recovery and utilization system 7 to replenish the oil product storage tank 9.

[0031] When the oil tanker 1 is unloading, that is, when the oil tanker 1 is unloading, the oil product is transported from the oil tanker outlet 102 of the oil tanker 1 to the tank inlet 902 of the oil product storage tank 9, enters the oil product storage tank 9, and the oil and gas on the tank top are discharged from the oil and gas outlet 904 of the oil product storage tank 9. The oil and gas are transported from the oil and gas outlet 904 to the oil and gas condensation recovery system 5, and the oil and gas are condensed and recovered in the oil and gas condensation recovery system 5 in the same way as when loading and the subsequent process is carried out.

[0032] When the oil tanker 1 is unloading, its liquid level drops, and nitrogen is transported from the nitrogen de-oiling tanker outlet 703 of the nitrogen recovery and utilization system 7 to the inert gas inlet 104 of the oil tanker 1, thereby inerting the cabin space of the oil tanker 1.

[0033] It can be seen that in the present invention, the same oil gas condensation recovery system 5 can be used for oil gas recovery, whether loading or unloading, and the same nitrogen recovery and utilization system 7 can be used to provide inerting nitrogen for various nitrogen-using equipment (e.g., oil tanker 1, ship-shore safety device 3, oil storage tank 9). Therefore, the present invention has low overall cost, simple operation and low operating cost.

[0034] The above embodiments of the utility model are merely examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the utility model are still within the scope of protection of the utility model.

Claims

1. A safe oil and gas recovery system for loading and unloading at a wharf and tank farm, comprising an oil tanker (1), characterized in that: The oil tanker (1) further comprises an oil and gas collection system (2), a ship-shore safety device (3), an oil and gas transportation system (4), an oil and gas condensation recovery system (5), a liquid nitrogen storage and transportation system (6), a nitrogen recovery and utilization system (7), a condensate collection and transportation system (8), an oil product storage tank (9) and a standard discharge system (10). The oil tanker (1) is provided with an oil tanker feed port (101) and an oil and gas collection port (103). The nitrogen recovery and utilization system (7) is provided with a nitrogen inlet (701), a nitrogen outlet to the ship-shore safety device (702) and a nitrogen outlet to the oil product storage tank (704). The oil product storage tank (9) is provided with a nitrogen sealing air inlet (901) and a storage tank outlet (903). The storage tank outlet (903) of the oil product storage tank (9) is connected to the oil tanker feed port (101) of the oil tanker (1). The oil tanker (1) The oil and gas collection port (103) is connected to the oil and gas collection system (2), the oil and gas collection system (2) is connected to the ship-shore safety device (3), the ship-shore safety device (3) is connected to the nitrogen outlet (702) to the ship-shore safety device of the nitrogen recovery system (7) and the oil and gas delivery system (4), the oil and gas delivery system (4) is connected to the oil and gas condensation recovery system (5), the oil and gas condensation recovery system (5) is connected to the liquid nitrogen storage and delivery system (6), the nitrogen inlet (701) of the nitrogen recovery system (7), the condensate collection and delivery system (8) and the standard discharge system (10), and the nitrogen sealing inlet (901) of the oil product storage tank (9) is connected to the nitrogen outlet (704) to the oil product storage tank of the nitrogen recovery system (7).

2. The oil gas safety recovery system for loading and unloading at docks and tank farms according to claim 1 is characterized in that: The oil tanker (1) is provided with an oil tanker discharge port (102), and the oil product storage tank (9) is also provided with a tank feed port (902) and an oil and gas outlet port (904); the oil tanker discharge port (102) of the oil tanker (1) is connected to the tank feed port (902) of the oil product storage tank (9), and the oil and gas outlet port (904) of the oil product storage tank (9) is connected to the oil and gas condensation recovery system (5).

3. The oil gas safety recovery system for loading and unloading at docks and tank farms according to claim 2 is characterized in that: The oil tanker (1) is also provided with an inert gas inlet (104), and the nitrogen recovery and utilization system (7) is also provided with a nitrogen de-oiling ship outlet (703), and the nitrogen de-oiling ship outlet (703) of the nitrogen recovery and utilization system (7) is connected to the inert gas inlet (104) of the oil tanker (1).

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