KR20120126755A - Apparatus for supplying vaporized gas fuel of Dual fuel engine type - Google Patents

Abstract

PURPOSE: A BOG(Boiled-Off Gas) supply device for plural dual fuel engines is provided to save energy as a BOG fuel source is optimized according to the operating conditions of an offshore floating structure or onshore power generation structure. CONSTITUTION: A BOG supply device for plural dual fuel engines comprises a vaporization unit(10). The vaporization unit produces BOG in a vaporizer(103) by heat exchanging LNG in a LNG tank(1) with a heat exchange medium. The vaporizer comprises a first vaporization chamber(103a) and a second vaporization chamber(103a"). A main BOG supply pipe(A) connected to a main engine(2) is connected to the first vaporization chamber. A sub BOG supply pipe(A") connected to a sub engine(3) is connected to the second vaporization chamber. A high-pressure pump for supplying LNG(102a) supplies LNG to the first vaporization chamber by increasing the LNG pressure up to the pressure proper to the main engine. A low pressure pump(102a") for supplying the LNG supplies the LNG to the second vaporization chamber by increasing the LNG pressure up to the pressure proper to the sub engine.

Description

Apparatus for supplying vaporized gas fuel of Dual fuel engine type

The present invention relates to a gaseous gas supply apparatus for offshore floating structures or onshore power generation facilities for handling LNG. It relates to a vaporization gas supply device for maximizing.

Marine floating structures (carriers, FSRUs, etc.) or onshore power generation facilities that handle (store, transport) LNG (Liquefied Natural Gas) or LNG power plants are vaporized with LNG stored in LNG tanks. As a result, a series of vaporization facilities are provided to maximize utilization.

For example, in the case of LNG carriers, diesel engines are being applied rather than turbine engines (engines) due to steam driving. Therefore, vaporized gas generated in the LNG tanks is recovered and liquefied into LNG, which is then converted into LNG tanks. The outgoing reliquefaction apparatus has been applied to LNG carriers, but such a reliquefaction apparatus has an unreasonable problem in that the expense of the equipment and operation of the reliquefaction apparatus is much higher than that of the reliquefaction of the vaporized gas. Under these circumstances, a new dual fuel engine has been developed that allows the gaseous gas generated from LNG tanks to be used as fuel for engines along with heavy oil that is the main fuel of diesel engines. Korea's fueling is emerging again.

In addition, in the case of a large-scale offshore floating structure (LNG carrier), for the purpose of power generation of the LNG carrier in addition to the high pressure main engine for the promotion of the LNG carrier, or to improve the starting output of the high pressure main engine. It is common to take the form of using one or more low pressure auxiliary engines in parallel, and in the case of large onshore power generation facilities, in addition to the main engine for the main electric power generation, one or more auxiliary engines for the auxiliary electric power generation are provided for efficient operation of the engine. Cases are common to take form. As mentioned above, it is common for an engine composed of a main engine and one or more auxiliary engines to use a dual fuel engine in consideration of efficient use of a power fuel source.

On the other hand, the boiled off gas produced and supplied from the LNG tank is a natural boiled off gas generated by naturally vaporizing in the LNG tank, and a forced vaporized gas generated by forcibly vaporizing as necessary. In the case of forced vaporization gas, unlike natural vaporization gas, a series of vaporization facilities including a separate heat exchange medium for vaporizing LNG and a heating means for heating the heat exchange medium are basically provided. Needed.

1 is an example showing the configuration of a gaseous gas supply device for a plurality of conventional dual fuel engine.

The conventional gaseous gas supply device shown in FIG. 1 is configured to supply forced gaseous gas as a fuel source toward the main engine 2 for high power (for high pressure), such as a propulsion power of an LNG carrier. The natural vaporization gas is supplied to the fuel source toward the auxiliary engine 3, which is a relatively low output (for low pressure) for assisting the starting output of the engine 2.

As shown, it is installed so that the natural vaporization gas supply pipe (B) connecting the LNG tank (1) and the auxiliary engine (3) (not shown in the various valve units for pressure and flow rate adjustment). In addition, the vaporization facility is configured in the forced vaporization gas supply pipe (A) connecting the LNG tank 1 and the main engine (2), the vaporization facility is basically drawn out the LNG stored in the LNG tank (1) vaporizer ( 5) The vaporization gas produced by vaporizing (evaporating) the LNG introduced from the LNG supply pump 4 and producing (forced) vaporization gas, which is supplied to the LNG supply pump 4 to be supplied to the main engine 2 A vaporizer 5 to be supplied to the gas, a heating device 6 for heating the heat exchange medium for vaporizing the LNG through heat exchange with the LNG, and a circulation pipe for circulating the heat exchange medium heated to a predetermined temperature to the vaporizer 5 (8) and the circulation pump 7 are comprised.

However, the conventional vaporized gas supply device of the type shown in FIG. 1 only supplies natural vaporized gas produced by itself in the LNG tank 1 toward the auxiliary engine 3, thereby ensuring a sufficient supply amount of natural vaporized gas. There was a problem that could not meet the utilization of more efficient fuel source.

In order to improve such a problem of the conventional vaporization gas supply apparatus, Figure 2 is another example showing the configuration of a conventional gaseous gas supply apparatus for a plurality of dual fuel engine.

The vaporization gas supply device shown in FIG. 2 includes the LNG tank 1 and the main engine 2 so as to supply forced vaporization gas as a fuel source not only toward the high pressure main engine 2 but also to the low pressure auxiliary engine 3. And a series of vaporization facilities are provided on the forced vaporization gas supply pipe (A) connecting the LNG tank (1) and the auxiliary engine (3), respectively.

However, the conventional vaporized gas supply device of the type shown in Figure 2, there is an advantage that can smoothly perform the production and supply of forced vaporization gas as needed toward the main engine (2) and the auxiliary engine (3), independent Due to the two groups of vaporization facilities for the production of forced vaporization gas, the production cost is high, and it is not easy to design and manufacture the vaporization facilities that occupy a large and complicated installation area. The problem of enlargement has arisen. Above all, the maintenance cost was too high to operate a plurality of vaporization facilities, and considering the energy aspect of the entire institution, a large efficiency increase could not be expected.

In addition, a series of vaporization equipments required for LNG vaporization, such as conventional LNG supply pumps, vaporizers, heaters, and heat exchange medium supply pumps, are often separately installed at arbitrary positions on complicated pipes connecting LNG tanks and engines. Because of the configuration, it brings inconvenience to batch maintenance work.

Therefore, the present invention is to solve the conventional problems as described above, the object is to provide a plurality of means by the simple modularization of one vaporization unit and having a means for individually supplying the vaporization gas at the appropriate pressure required by a plurality of engines, The present invention provides a gaseous gas supply device for a plurality of dual fuel engines that can greatly improve the overall energy efficiency of the engine due to the supply of a more efficient fuel source toward the engine.

The present invention for achieving the above-mentioned problems is the vaporization of the LNG vaporized toward the high pressure main engine for obtaining the main driving force of the offshore floating structure or onshore power generation facilities handling the LNG and the low pressure auxiliary engine for obtaining the auxiliary driving force. In the vaporization gas supply device for supplying gas to the fuel source,

LNG vaporized from the LNG tank using a heat exchange medium to produce a vaporized gas in the vaporizer, and to provide a vaporization unit for supplying the produced vaporized gas to the fuel source of the engine,

The vaporizer includes a first vaporization chamber in which a vaporization gas main supply pipe connected to the main engine is connected and a second vaporization chamber in which a vaporization gas auxiliary supply pipe connected to the auxiliary engine is connected and partitioned through an internal partition wall.

A high pressure pump for supplying LNG to boost the pressure of the LNG flowing from the LNG tank to an appropriate pressure required by the main engine and supply it to the first vaporization chamber, and the pressure of the LNG flowing from the LNG tank is required by the auxiliary engine. And a low pressure pump for supplying LNG supplied to the second vaporization chamber by boosting the pressure to an appropriate pressure.

The vaporization gas supply device may include a suction drum for temporarily storing LNG from the LNG tank and supplying the LNG stored by its internal pressure to the LNG supply high pressure pump or the LNG supply low pressure pump.

The vaporization gas supply device may include a natural vaporization gas supply pipe for supplying the natural vaporization gas generated from the LNG tank to the auxiliary engine.

In addition, the vaporization unit, the vaporization gas main supply pipe connected to the main engine, the vaporization gas auxiliary supply pipe connected to the auxiliary engine, and LNG inlet pipes connected to the LNG tank is provided in a modular form to enable separation and coupling. It may be.

In addition, the vaporization unit may be provided in a modular form is installed integrally in the plate or housing structure.

From the above means, the present invention is provided with a high-pressure pump and a vaporization chamber for the main engine provided in one modularized vaporization unit and at the same time separate the low-pressure pump and the vaporization chamber for the auxiliary engine, if necessary as the main engine and auxiliary engine It is possible to supply selective gaseous gas as well as to simultaneously supply gaseous gas to the main and auxiliary engines, maximizing the utilization of gaseous gas fuel sources according to the operation and driving conditions of offshore floating structures or onshore power generation facilities. There is an effect that can significantly reduce the energy consumption of the institution.

In addition, the present invention can be selectively separated and coupled from the LNG tank and a plurality of engines by using a vaporization unit constituting a simple structure, there is an advantage that the design, manufacturing, mobility and maintenance is easy.

1 is an example showing the configuration of a gaseous gas supply device for a plurality of conventional dual fuel engine.
Figure 2 is another example showing the configuration of a gaseous gas supply device for a plurality of conventional dual fuel engine.
Figure 3 is a schematic diagram for showing the configuration of the vaporization gas supply apparatus according to the present invention.

The features and effects of the present invention described above or not will become more apparent through the embodiments of the present invention with reference to the accompanying drawings.

3 is a schematic view for showing the configuration of a vaporization gas supply apparatus according to the present invention.

Referring to FIG. 3, the vaporization gas supply apparatus according to the present invention uses a plurality of dual fuel engines, that is, a main engine 2 and an auxiliary engine 3, by using a simple modular vaporization unit 10. It was designed to carry out the supply of vaporized gas as needed more economically and efficiently by collectively or bidirectionally toward.

For example, the vaporized gas supply device of the present invention, when applied to the offshore floating structure, for the purpose of producing power to be consumed in the high-pressure main engine for propulsion power and the offshore floating structure, or the main for high pressure It may include a low pressure auxiliary engine (3) which is installed for the purpose of assisting the starting output of the engine (2), when applied to onshore power generation equipment, and the high pressure main engine (2) for the main power production, and auxiliary It may include a low pressure auxiliary engine (3) for power generation. In general, the degree of pressure of the vaporization gas required by the main engine (2) and the auxiliary engine (3) according to the type of the engine is set differently in consideration of the efficiency of the engine, for example, the vaporization gas supplied to the main engine (2) The pressure of the vaporized gas supplied to the auxiliary engine (3) to maintain the pressure of about 300bar is to maintain about 5 ~ 6bar.

In addition, each engine (2) (3) to which the gaseous gas supply device of the present invention is applied is a dual fuel engine type, which is required to use a main fuel source such as heavy oil as a power source (generally recommended according to national environmental regulations, etc.). Engine type that can be powered by another type of auxiliary fuel source, such as vaporized gas. In such a dual fuel engine, a means capable of converting the fuel used as necessary, that is, a deflector facility and an operation relationship thereof is not included in the scope of the present invention, and thus detailed description thereof is omitted.

The vaporization gas supply apparatus of the present invention basically includes a vaporization unit 10 for introducing LNG from the LNG tank 1 and supplying (forced) vaporization gas toward the main engine 2 or the auxiliary engine 3. do.

The vaporization unit 10 includes a suction drum 101, an LNG supply pump 102, a vaporizer 103, a heating device 104, and a circulation pump 105 for a heat exchange medium, as shown.

The suction drum 101 does not supply LNG directly from the LNG tank 1 toward the supply pump 102, but temporarily stores the LNG in the suction drum 101 and then stabilizes the LNG thereafter. ) To be supplied to the supply pump 102 under pressure, and if the LNG is compressed and cooled to cryogenic temperature (-163 ° C.) in the LNG tank 1 directly to the supply high pressure pump 102. Since it is not easy to control the LNG, it is not easy to supply the LNG at an appropriate pressure and capacity toward the downstream vaporizer 103. For this reason, the suction drum 101 is provided between the LNG tank 1 and the supply pump 102 so that LNG of a stable pressure and capacity can be supplied to the supply pump 102 at all times.

Although not shown, the suction drum 101 includes means for adjusting the storage pressure and storage capacity of the LNG flowing into the LNG, so that the LNG at a constant pressure and capacity is stably directed toward the LNG supply pump 102 at all times. Can be supplied.

For example, the storage pressure adjusting means in the suction drum 101 may include a pressure controller, a pressure regulating valve, and a pressure sensor. The pressure controller may be configured to control the pressure in the drum from the pressure sensor located in the suction drum 101. The pressure in the suction drum 101 can be decreased or increased depending on the degree of return of the natural vaporization gas located above the LNG in the suction drum 101 to the LNG tank 1 by opening and closing the pressure regulating valve. have.

Meanwhile, the storage capacity adjusting means in the suction drum 101 may include a capacity controller, a capacity sensor, and a capacity control valve. The capacity controller may be a capacity of LNG in the drum from a capacity sensor located in the suction drum 101. The (height) information is provided to open and close the capacity control valve and reduce or increase the capacity of the LNG in the suction drum 101.

The LNG supply pump 102 is to boost the LNG discharged from the suction drum 101 to an appropriate pressure and to stably supply the vaporized vaporizer 103 to the downstream vapor tank 103 so as to recommend the use of a pump suitable for cryogenic temperatures. do.

At this time, the LNG supply pump 102 is composed of a high pressure pump 102a for LNG supply for the main engine 2 and a low pressure pump 102a "for LNG supply for the auxiliary engine 3.

That is, the LNG supply high pressure pump 102a boosts the LNG to maintain the proper pressure (for example, 300 bar) of the vaporized gas supplied to the fuel source of the main engine 2 to the downstream vaporizer 103. The low pressure pump 102a ″ for LNG supply boosts LNG so as to maintain an appropriate pressure (for example, 5 to 6 bar) of gaseous gas supplied to the fuel source of the auxiliary engine 3 to supply the downstream pressure. Supply to the vaporizer 103.

The use of the terms of the high pressure pump 102a and the low pressure pump 102a "is to boost the pressure to a pressure corresponding to the appropriate pressure required by the main engine 2 or the auxiliary engine 3, and considering the relative pressure difference. The use of the terms 'high pressure pump' and 'low pressure pump' is adopted, and there is no special meaning.

The vaporizer 103 provides a space for producing vaporized gas from the LNG by heat exchange with the LNG using a heat exchange medium, and the vaporized gas thus produced is supplied to the main engine (2) or the auxiliary engine (3).

At this time, the vaporizer 103 includes a first vaporization chamber 103a and a second vaporization chamber 103a ".

That is, the first vaporization chamber 103a is connected and installed to receive the high pressure LNG from the high pressure pump 102a for LNG supply, and the second vaporization chamber 103a "is the low pressure pump 102a" for LNG supply. ) Is installed so as to receive relatively low pressure LNG.

In addition, the first vaporization chamber (103a) and the main engine (2) to the vaporization gas main supply pipe (A) to supply the high-pressure vaporized gas produced in the first vaporization chamber (103a) to the main engine (2). The second vaporization chamber 103a "and the auxiliary engine 3 to supply the relatively low pressure vaporized gas produced in the second vaporization chamber 103a" to the auxiliary engine 3, respectively. It is connected to the supply pipe (A ").

Preferably, the vaporizer 103 to secure the internal space by a single housing, and to partition the first vaporization chamber 103a and the second vaporization chamber 103a "through the partition 1031 installed in the internal space. To be configured.

The heating device 104 is for heating the heat exchange medium to a predetermined temperature so that the heat exchange medium and the cryogenic LNG are heat-exchanged to vaporize (evaporate) the LNG, and the heat exchange medium may circulate through the vaporizer 103. It is configured on the circulation pipe 106 is configured to be installed.

The heat exchange medium heated to a predetermined temperature through the heating device 104 is continuously circulated through the vaporizer 103 by the operation of the circulation pump 105 installed on the circulation pipe 106.

In this case, the circulation pipe 106 extending from the one heating device 104 extends into the vaporizer 103 and passes through the inner partition 1031 and passes through the first vaporization chamber 103a to pass through the first heat exchange tube 106a. ) And the second heat exchange tube portion 106a "passing through the second vaporization chamber 103a" form a parallel structure so as to jointly use the heat exchange medium.

The heat exchange medium may be various kinds such as ethylene glycol (Ethylene Glycol), steam air, and the like, but is not particularly limited.

As described above, the series of vaporization units 10 including the suction drum 101, the LNG supply high pressure pump 102, the vaporizer 103, the heating device 105, and the circulation pump 105 may be a plate or a housing structure. It can be provided in the form of a module forming a unity within.

And although not shown, the vaporization unit 10 is provided in a modular form, the vaporization gas main supply pipe (A) connected to the main engine (2), and the vaporization gas auxiliary supply pipe connected to the auxiliary engine ( A ″) and the LNG inlet pipe 1a connected to the LNG tank 1 can be separated and coupled. A modular vaporization unit 10 allows the LNG tank 1 and the engine 2 to be separated. (3) Each pipe (1a) (A) (A ") connecting to each other is composed of a detachable coupling means that can be separated and coupled, the valve means is basically installed on each pipe connection to enable such a removable coupling do.

By providing the vaporization unit 10 in the form of a module as described above, the production and mobility of the vaporization unit 10 is convenient, and LNG is selectively supplied from a plurality of LNG tanks 1 provided in an offshore floating structure or an onshore power generation facility. It is easy to receive or collectively supply. In addition, by providing the vaporization unit 10 of the modular form, not only the installation of the offshore floating structure or the onshore power generation facility is simple, but also there is an advantage that can be easily performed collective maintenance.

In addition, by providing the vaporization unit 10 in the form of a module, it is easy to separate and coupled with the LNG tank 1 and the engine (2) 3 from the vaporization unit 10, LNG tank 1, vaporization There is an advantage that the independent maintenance of each of the unit 10 and the engine 2 and 3 can be easily performed without interference.

As described above, the high-pressure pump 102a and the high-pressure first vaporization chamber 103a for supplying the high-pressure vaporized gas toward the main engine 2 on one vaporization unit 10 are constituted, while the auxiliary engine 3 The low pressure pump 102a "and the low pressure 2nd vaporization chamber 103a" for supplying vaporization gas of low pressure toward () are selected, and it selects toward the main engine 2 and the auxiliary engine 3, and Not only can the gaseous gas be supplied in a specific manner, but in some cases, the gaseous gas can be supplied to the main engine 2 and the auxiliary engine 3 at the same time, so that a sufficient amount of gaseous gas is always supplied in accordance with the driving conditions of each engine. It is possible to meet the requirements, and to flexibly adjust the amount of supply for each institution, which can greatly increase the energy efficiency of the entire organization.

On the other hand, as described above, the vaporization gas supply apparatus according to the present invention, as shown in the drawing, not only supplies the forced vaporization gas for producing the vaporization gas from the LNG using the vaporization unit 10 as necessary, but also from the LNG tank 1. It may also include a natural vaporization gas supply pipe (B) for supplying the generated natural vaporization gas to the engine.

At this time, the natural vaporization gas supply pipe (B) may be installed to be connected to the auxiliary engine (3) for relatively low pressure.

Although not shown, the natural vaporization gas supply pipe B includes various valve units for controlling the pressure or flow rate of the vaporized gas.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(1): LNG tank (2): main engine
(3): auxiliary engine (10): vaporization unit
101: suction drum 102: LNG supply pump
102a: high pressure pump for LNG supply (102a "): low pressure pump for LNG supply
103: Carburetor 1031: Bulkhead
103a: first vaporization chamber 103a ": second vaporization chamber
(104): heating device (105): circulation pump
(106): purified piping (106a): first heat exchange tube
(106a "): 2nd heat exchange pipe part (A): vaporization gas main supply pipe
(A "): vaporized gas auxiliary supply pipe (B): natural vaporized gas supply pipe

Claims (5)

To a vaporized gas supply device that supplies vaporized gas vaporized with LNG to a fuel source toward a high pressure main engine for obtaining the main driving force of an offshore floating structure that handles LNG or a low pressure auxiliary engine for obtaining auxiliary driving force. In
LNG vaporized from the LNG tank using a heat exchange medium to produce a vaporized gas in the vaporizer, and to provide a vaporization unit for supplying the produced vaporized gas to the fuel source of the engine,
The vaporizer includes a first vaporization chamber in which a vaporization gas main supply pipe connected to the main engine is connected and a second vaporization chamber in which a vaporization gas auxiliary supply pipe connected to the auxiliary engine is connected and partitioned through an internal partition wall.
A high pressure pump for supplying LNG to boost the pressure of the LNG flowing from the LNG tank to an appropriate pressure required by the main engine and supply it to the first vaporization chamber, and the pressure of the LNG flowing from the LNG tank is required by the auxiliary engine. A vaporization gas supply device for a plurality of dual fuel engines, comprising a low pressure pump for supplying LNG supplied to the second vaporization chamber by boosting the pressure to an appropriate pressure. The method of claim 1, wherein
The vaporization gas supply apparatus, comprising a suction drum for temporarily storing LNG from the LNG tank and supplying the LNG stored by its internal pressure to the high pressure pump for LNG supply or the low pressure pump for LNG supply. Vaporized gas supply for fuel engines. The method according to claim 1 or 2,
The vaporization gas supply apparatus, the vaporization gas supply apparatus for a plurality of dual fuel engine, characterized in that it comprises a natural gas vaporization supply pipe for supplying the natural gas generated from the LNG tank to the auxiliary engine. The method of claim 1,
The vaporization unit, the vaporization gas main supply pipe connected to the main engine, the vaporization gas auxiliary supply pipe connected to the auxiliary engine, and the LNG inlet pipe connected to the LNG tank is provided in a modular form to enable separate coupling. Gasification gas supply apparatus for a plurality of dual fuel engine. The method of claim 1,
The vaporization unit, the gas or gas supply device for a plurality of dual fuel engine, characterized in that the unit is provided integrally installed in a plate or housing structure.

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