KR20180133268A - carrier Propelling system - Google Patents

Abstract

According to the present invention, a carrier propelling system comprises: a crude oil storage unit storing crude oil and a volatile organic compound (VOC) generated from the crude oil; a re-liquefaction unit liquefying the VOC; a generation unit producing power by using a semi-volatile organic compound (SVOC) having not been liquefied in the re-liquefaction unit; a liquefied oil steam tank storing a liquid volatile organic compound (LVOC) liquefied in the re-liquefaction unit; an alternative fuel tank storing an alternative fuel such as natural gas or methanol; and a mixing supply system selectively supplying a fluid stored in the liquefied oil steam tank and a fuel stored in the alternative fuel tank to a demander.

Description

{Carrier Propelling System}

The present invention relates to a carrier propulsion system, and more particularly to a propulsion system applied to a carrier for transporting crude oil and the like.

Petroleum products, which are widely used in industry today, are extracted from crude oil. Crude oil, which is a useful resource, is produced at a production site such as a seabed well, and then transported to a consumer site through a carrier such as a crude oil carrier . Crude oil transported to the consumer through the crude carrier can be stored in various crude oil storage facilities or stored in offshore oil storage facilities such as FSU (Floating Storage Unit) to store the produced crude oil at sea. In a storage tank storing crude oil, a volatile organic compound (VOC) is continuously generated at room temperature.

Volatile Organic Compound (VOC) is a generic term for liquid or gaseous organic compounds that are easily vaporized under atmospheric pressure at room temperature because of their high vapor pressure. Such VOCs cause sunlight and photochemical reaction when released into the atmosphere, It generates photochemical oxidizing substances and causes photochemical smog. In addition, some substances in VOCs are known to cause toxic substances through photochemical reactions to contaminate human bodies and ecosystems. Many of the substances belonging to VOCs are carcinogenic substances and are associated with global warming. Typical VOCs include gasoline, naphtha, and BTX (Benzene, Toluene, Xylene). Most of the hydrocarbons are included in VOCs.

Because of the hazard of these VOCs, the Kyoto Protocol has defined methane as a greenhouse gas, as well as the UNECE and IMO (International Maritime Organization) are responsible for loading / unloading VOCs Some regulations are in place, and efforts are being made to use VOC as fuel in the carrier itself, which transports crude oil to regulate the emission of VOCs.

Conventionally, in order to use VOC recovered from a tanker as a fuel, a VOC is burned in a boiler, and a steam generated by the generated heat is used to generate power through a steam turbine Reforming the VOC with methane using a reformer that reduces VOC or reforms heavy hydrocarbons to light methane using steam and heat, ) To produce electricity through the engine. However, these methods are not a complete solution for processing VOCs.

The Steam Turbine System, which generates steam using a boiler and operates the turbine, not only has a large footprint but also uses high-temperature / high-pressure steam With the risk associated with it, the Reformer fuel system (Dual Fuel Generator System) has not been verified as available on the carrier of the reformer, as well as a periodic maintenance Maintenance is required and additional fuel combustion is necessary because a large amount of steam is required for reforming.

Accordingly, there is a need for an improved method for minimizing the emission of VOC generated from a carrier storing crude oil and for efficiently utilizing the VOC.

Patent Document 0001) Korean Patent Laid-open No. 10-2014-0096446 (published on Aug. 20, 2014)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a carrier ship propulsion system that minimizes the emission of VOC generated from a carrier and efficiently utilizes the carrier.

According to an aspect of the present invention, there is provided a crude oil storage unit for storing VOCs generated from crude oil and crude oil; A re-culling unit for liquefying the VOC; A power generator for generating power using the SVOC that has not been liquefied in the re-cure unit; A liquefaction vapor tank storing LVOC to be liquefied in the re-cure unit; An alternative fuel tank for storing alternative fuels such as natural gas or methanol; And a mixed supply system for selectively supplying the fluid stored in the liquefied vapor tank and the alternative fuel tank to the customer.

The demander includes a main engine and a power generation engine provided in parallel, and the power generation engine can supply power to the propulsion motor and the dynamic position maintaining device provided in parallel.

The power generation engine may supply electric power to the propulsion motor and the dynamic position maintaining device through a distributor.

The demander may include a power generation engine, and the power generation engine may supply power to the propulsion motor or the dynamic position maintaining device provided in parallel via the distributor.

The demander may include a main engine and a power generation engine provided in parallel, and the distributor may supply electric power generated from the power generation engine and the axial generator of the main engine to a propulsion motor or a dynamic position maintaining device.

The main engine may be ME-LGI capable of direct combustion of LVOC.

In order to satisfy the environmental regulation of the carrier, the carrier propulsion system according to the present invention uses a liquid hydrocarbon (LVOC) as a light hydrocarbon as a fuel, and the fuel which is insufficient is bunkering-friendly LPG / methanol / ethanol , It is possible to prevent environmental pollution and realize efficient energy utilization.

In addition, using the ME-LGI engine as a fuel source, the LOC with VOC re-liquefied can be used immediately without further processing.

1 shows a conceptual diagram of a carrier propulsion system according to a first embodiment of the present invention.
Figure 2 shows the fuel supply of the carrier propulsion system according to the second embodiment of the present invention.
3 shows a fuel supply section of the carrier propulsion system according to the third embodiment of the present invention.
4 shows a fuel supply section of a carrier propulsion system according to a fourth embodiment of the present invention.
5 shows a fuel supply section of a carrier propulsion system according to a fifth embodiment of the present invention.
6 shows a fuel supply section of a cargo propulsion system according to a sixth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

There is shown a conceptual diagram of a carrier propulsion system according to a first embodiment of the present invention. Referring to the drawings, the carrier propulsion system according to the present invention includes a crude oil storage unit 10 for storing VOCs generated from crude oil and crude oil, a re-cure unit 20 for liquefying the VOC, A liquefied vapor tank 41 for storing LVOC (Liquid Volatile Organic Compound) to be liquefied in the remanufacturing unit 20, natural gas, methanol, and the like And a mixed supply system 43 for selectively supplying the fluid stored in the liquefied vapor tank 41 and the alternative fuel tank 42 to the customer.

Here, the carrier is a means for loading crude oil from a marine platform (F) and transporting the loaded crude oil to a destination. In addition to a ship capable of propulsion with self-propulsion capability, it is also used as a floating water storage (FPSO) Structure.

The offshore platform (F) includes floating production storage and offloading (FPSO), which was developed for the purpose of mooring deep-sea resources such as crude oil at a fixed position over a long period at sea. Such a production-equipped offshore platform F has been developed in various forms depending on the depth or function. In one embodiment of the present invention, a fixed sea platform, a soft sea platform, a floating sea platform ≪ / RTI >

The crude oil storage unit 10 is a means for storing the crude oil obtained from the marine platform F or the like, and may be a cargo hold provided on the carrier. The crude oil storage part 10 can contain crude oil and volatile organic compounds (VOC) generated by natural evaporation of crude oil.

The remanent unit 20 may be a means for re-liquefying volatile organic compounds (VOC) generated in the process of naturally evaporating the crude oil stored in the crude oil storage unit 10 or unloading the crude oil into the storage unit 10. For this, the remanent unit 20 may include a heat exchanger and a condenser for controlling the temperature of the VOC. The VOC passing through the remanent unit 20 is divided into a gas-phase SVOC and a liquid-state LVOC.

The power generation section 30 is a means for producing electricity using part or all of the gas-phase SVOC passing through the remanufacturing section 20, for example, by burning the SVOC using a gas turbine or a boiler, Can be generated. The SVOC generated in the remanufacturing unit 20 is burned in a gas turbine or a boiler to generate electricity and transfer the SVOC to a place where electric power is required.

The fuel supply unit 40 is a part for driving the carrier using the liquefied VOC, that is, the LVOC in the remanufacturing unit 20. The fuel supply unit 40 mainly includes a liquefied vapor tank 41, an alternative fuel tank 42, a mixed supply system 43, Include each customer. At this time, the customer can be a means for generating driving force or electric power by directly using the LVOC as either the main engine 44 or the power generation engine 45 shown in FIG.

The liquefied vapor tank 41 is a storage body for storing the LVOC separated through the re-cure unit 20. The alternative fuel tank 42 is a storage tank for storing and storing liquefied natural gas (LPG), methanol or ethanol, And can be installed inside the carrier. The liquefied vapor tank 41 and the alternative fuel tank 42 may be made of independent type or membrane type cargo holds and made of special steel for cryogenic temperature such as aluminum steel, stainless steel and 35% nickel steel . An upper portion of the liquefied vapor tank 41 and the alternative fuel tank 42 is connected to an auxiliary fuel tank 42 for supplying alternative fuel such as liquefied natural gas or various pipelines for unloading liquefied natural gas from the alternative fuel tank 42. [ And a liquid dome (not shown) in which a plurality of liquids (not shown) are installed.

The mixed supply system 43 selectively supplies the LVOC supplied from the liquefied vapor tank 41 and the liquefied gas supplied from the alternative fuel tank 42 to the pressure or temperature required by the customer. The mixed supply system 43 primarily transfers the LVOC supplied from the liquefied vapor tank 41 to the customer. However, if the amount of the LVOC is not sufficient, or if necessary, the LNG supplied from the alternative fuel tank 42, Gas can be supplied to customers. If LVOC emissions are low due to low VOC emissions, LPG / methanol / ethanol supplied through alternative fuel tank 42 is used as supplemental fuel to supplement the deficient amount of LVOC. At this time, the mixed supply system 43 can pressurize and transfer the fuel at about 8 bar to 50 bar depending on the type of the demand-destination engine.

The main engine 44 may be an ME-LGI engine that can be used directly from the mixed supply system 43 by receiving VOC or alternative fuel. As described above, when the ME-LGI engine is used as the main engine 44, it is possible to use the exhaust gas recirculation system (EGR, Exhaust Gas Recirculation) as well as directly use the VOC and the like without any additional equipment. In addition, the main engine 44 can generate electric power by using an axial generator 44a for generating additional electric power. In this case, the carrier may be a carrier for propelling a main engine 44 and a power generation engine 45, which will be described later, in combination.

The power generation engine 45 may be a DFDE or Gas Turbine that is powered by the liquid fuel from the mixed supply system 43 as a means for generating electric power. If the DFDE or Gas Turbine is used as the power generation engine 45, the emission standard of the VOC is satisfied without additional equipment. The electric power produced by the power generation engine 45 may be supplied to a propulsion motor 46 or a dynamic position holding device 47 to be described later via a distributor 48 (T / F). And the carrier can be operated by direct propulsion using the power generation engine 45, ME-LGI engine.

The distributor 48 may supply electric power produced by the power generator engine 45 or the shaft generator 44a attached to the main engine 44 to the propulsion motor 46 or the dynamic position holding device 47 or the like. In this case, the propulsion motor 46 is a means for propelling the carrier or the like using electric power. The dynamic position holding device 47 is a means for maintaining the balance of the hull with respect to the external force such as the direction of the carrier, For example, a power consuming device operated by an electric power supply, as a thruster.

Thus, the carrier propulsion system according to the first embodiment of the present invention has been described. As such a propulsion method of the carrier, there is a method of driving the propulsion motor 46 using the electric power obtained by the LVOC combustion or the propulsion motor 46 propulsion method using the direct propulsion and electric power using the first Me-LGI engine as the power generation engine 45 Can be performed in parallel. This is because the ME-LGI engine can be used to re-liquefy the LVOC immediately without further processing, and it can be used as fuel for recovery of VOC and alternative fuel such as LPG / methanol / ethanol .

Figs. 2 to 6 show fuel supply portions of the carrier propulsion system according to the second to sixth embodiments of the present invention, respectively.

The fuel supply unit in the second embodiment is provided with the mixed supply system 43 that is supplied with LVOC from the liquefied vapor tank 41 and supplied from the alternative fuel tank 42 and the liquefied vapor tank 41 and the alternative fuel tank 42, And a main engine 44 and a power generation engine 45 that are supplied with fuel from the mixed supply system 43. The power generation engine 45 generates power from the power generation engine 45, The power can be supplied to one propulsion motor 46 and two dynamic position holding devices 47 via the distributor 48. [

In the third embodiment, the fuel supply unit includes a mixed supply system 43 for supplying LVOC or alternative fuel from the liquefied vapor tank 41 and the alternative fuel tank 42, And the power generated by the power generation engine 45 can be supplied to the two propulsion motors 46 and the two dynamic position holding devices 47 via the distributor 48, respectively.

In the fourth embodiment, the fuel supply unit includes a mixed supply system 43 that receives LVOC or alternative fuel from the liquefied vapor tank 41 and the alternative fuel tank 42, The power generated by the power generation engine 45 including the main engine 44 and the single power generation engine 45 can be supplied to the two dynamic position holding devices 47 via the distributor 48, respectively.

In the fifth embodiment, the fuel supply unit includes a mixed supply system 43 that receives the LVOC or alternative fuel from the liquefied vapor tank 41 and the alternative fuel tank 42, The power produced by the shaft generator 44a and the power generation engine 45 is supplied to the two dynamic engines 44 and 44 via the distributor 48. The two motors 44 and 44, And can be supplied to the position holding device 47, respectively.

In the sixth embodiment, the fuel supply unit includes a mixed supply system 43 that receives LVOC or alternative fuel from the liquefied vapor tank 41 and the alternative fuel tank 42, The power generated by the two axial generators 44a may be supplied to the two dynamic position holding devices 47 via the distributor 48 respectively .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

F: marine platform 10: crude oil reservoir
20: remanufacturing part 30: power generating part
40: fuel supply unit 41: liquefied vapor tank
42: Alternative fuel tank 43: Mixed feed system
44: main engine 44a: shaft generator
45: power generation engine 46: propulsion motor
47: Dynamic Positioning Device 48: Dispenser

Claims (6)

A crude oil storage unit for storing VOCs generated from crude oil and crude oil;
A re-culling unit for liquefying the VOC;
A power generator for generating power using the SVOC that has not been liquefied in the re-cure unit;
A liquefaction vapor tank storing LVOC to be liquefied in the re-cure unit;
An alternative fuel tank for storing alternative fuels such as natural gas or methanol; And
And a mixed supply system for selectively supplying the fluid stored in the liquefied vapor tank and the alternative fuel tank to a customer. The method according to claim 1,
Wherein the demander includes a main engine and a power generation engine provided in parallel,
Wherein the power generating engine supplies electric power to the propulsion motor and the dynamic position maintaining device, respectively. 3. The method of claim 2,
Wherein the power generating engine supplies power to the propulsion motor and the dynamic positioning apparatus via a distributor. The method according to claim 1,
Wherein the demander includes a power generation engine,
Wherein the power generation engine supplies power to the propulsion motor or the dynamic positioning apparatus via a distributor. The method according to claim 1,
Wherein the demander includes a main engine and a power generation engine provided in parallel,
Wherein the distributor supplies electric power generated by the power generation engine and an axial generator provided in the main engine to a propulsion motor or a dynamic position maintaining device. The method according to claim 1,
Wherein the main engine is ME-LGI capable of direct combustion of LVOC.

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