JP5183756B2 - Floating LNG re-vaporization equipment - Google Patents

Description

  The present invention relates to a floating type LNG re-vaporization facility, and more specifically, by adding a gas turbine generator, which is a power production facility capable of producing electric power, on a re-vaporization facility for re-vaporizing LNG. Gas and electricity can be supplied simultaneously, and the gas turbine generator can be driven using the gas generated in the re-vaporization facility. The cost of installing the gas turbine generator can be reduced by removing the compressor of the gas turbine, and after generating steam using the exhaust gas generated in the gas turbine generator, the steam is LNG revaporizer And as a drive power for steam turbine generators added for electric power generation, the energy consumed by the entire facility due to waste heat recovery is minimized. And be Rukoto can achieve cost savings, yet, about the floating LNG regasification facility may also prevent marine pollution through waste heat use.

  Generally, an LNG floater (floating type LNG re-vaporization facility) refers to a marine facility equipped with a facility for producing LNG or natural gas in a barge-like suspended matter.

  This type of LNG floater (LNG Floater) has a different arrangement of the upper equipment depending on the shape of the cargo trap that stores LNG. For example, when the cargo trap is MOSS, there is no problem with the LNG sloshing phenomenon. However, it is more than necessary due to spatial constraints to produce FPSO (floating crude oil production storage equipment) that produces LNG and to remodel existing LNG ships to LNG FPSO. Area is required.

  When the cargo cage is a membrane, there are many restrictions on using it as a cargo cage for LNG floaters due to the sloshing phenomenon, and in particular, the strength of the insulated portion of the cargo cage must be greatly increased. In the case of remodeling, it is necessary to change a part of the cargo cage and replace it with reinforced insulating material.

  When the cargo tank is SPB, it is expected that there is no problem of the sloshing phenomenon, and it is used as a cargo tank of the LNG floater, but the production cost is higher than that of the membrane method.

  In this way, it is possible to produce gas in a state of being floated on the sea surface on the sea using various LNG re-vaporization facilities depending on the shape of the cargo tank.

  As an example, a conventional floating LNG revaporization facility according to the prior art will be schematically described as follows.

  As shown in FIG. 1, the floating LNG re-vaporization facility according to the prior art is in a state of floating on the sea, and each of the LNG tank 10 storing the LNG and the LNG in the LNG tank 10 to the outside. A low-pressure pump 81 for discharging, a buffer tank 82 that is provided outside and temporarily relaxes LNG discharged from the LNG tank 10, a high-pressure pump 83 that discharges LNG in the buffer tank 83 to the outside, and a flow rate of LNG A flow control valve 84 for controlling supply and an LNG revaporizer 20 for revaporizing LNG are provided.

  The floating LNG re-vaporization facility according to the related art having such a configuration produces gas after LNG is supplied from the LNG tank 10 and LNG is re-vaporized in the LNG re-vaporizer 20.

  However, such a conventional LNG re-vaporization facility can produce only gas and is forced to use seawater for re-evaporation, which adversely affects the marine environment. And in summer when the amount of gas consumption decreases, if the storage period of LNG becomes longer, the gas generated by heat transfer is forcibly incinerated or released into the atmosphere, resulting in wasted energy. Moreover, in the case of a generator used to support the construction of a plant on the shore, there has been a problem such as causing marine pollution by the conventionally used fuel.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gas turbine generator which is a power production facility capable of producing power on a re-vaporization facility for re-vaporizing LNG. By providing this, a floating LNG re-vaporization facility capable of supplying gas and electricity at the same time is provided.

  Another object of the present invention is that the gas turbine generator can be driven using the gas generated in the re-vaporization facility, so the compressor for gas compression of the gas turbine generator is eliminated. The present invention provides a floating LNG re-vaporization facility that can reduce the cost of installing a gas turbine generator.

  Still another object of the present invention is to provide a steam turbine generator in which steam is generated using exhaust gas generated in a gas turbine generator and then the steam is added for LNG revaporizer and electric power generation. By using it as drive power, it is possible to reduce the energy consumed by the entire facility due to waste heat recovery as much as possible, thereby reducing costs, and floating LNG that can prevent marine pollution through the use of waste heat. There is a re-vaporization facility.

  In order to achieve the above object, the floating LNG revaporization facility of the present invention is a floating LNG revaporization facility comprising an LNG storage tank and an LNG revaporizer, and the gas passing through the LNG revaporizer. It is characterized by further comprising an electric power production facility capable of producing electric power as well as production.

In the floating LNG revaporization facility according to the present invention, the power production facility is configured to produce electric power through a gas turbine generator that is operated by the revaporized gas produced in the LNG revaporizer.

The floating LNG re-vaporization facility according to the present invention further includes an exhaust gas heat exchanger that generates high-temperature steam using the exhaust gas generated in the gas turbine generator.
Furthermore, the floating LNG revaporization facility according to the present invention further includes a supply flow path for supplying exhaust gas generated in the exhaust gas heat exchanger to the LNG revaporizer.

  Further preferably, in the floating LNG re-vaporization facility according to the present invention, the LNG re-vaporizer uses steam generated in the exhaust gas heat exchanger as an energy source for LNG re-vaporization.

  Further preferably, in the floating LNG revaporization facility according to the present invention, the steam generated in the LNG revaporizer is converted to water and reused as condensed water for generating steam in the exhaust gas heat exchanger. Is done.

  Furthermore, preferably, the floating LNG revaporization facility according to the present invention further includes a heat exchanger that heats water discharged from the LNG revaporizer to convert it into high-temperature condensed water.

  Furthermore, preferably, in the floating LNG revaporization facility according to the present invention, the heat exchanger uses cooling water discharged from the LNG revaporizer, and is used on the gas turbine generator and other revaporization facilities. Cools high-temperature cooling water discharged from air conditioning systems.

  Further preferably, the floating LNG re-vaporization facility according to the present invention further includes a steam turbine generator that generates electricity using steam generated in the exhaust gas heat exchanger.

  Further preferably, in the floating LNG re-vaporization facility according to the present invention, the water discharged from the steam turbine generator is mixed with the water discharged from the LNG re-vaporizer and supplied to the heat exchanger.

  The floating type LNG re-vaporization facility according to the embodiment of the present invention includes a gas turbine generator, which is a power production facility capable of producing electric power, on a re-vaporization facility for re-vaporizing LNG. Thus, an effect that gas and electricity can be supplied simultaneously can be obtained.

  In addition, since the gas turbine generator can be driven using the gas generated in the re-vaporization facility, the compressor for gas compression of the gas turbine generator is deleted and the gas turbine generator is installed. The effect that the cost by can be reduced can be obtained.

  Furthermore, after generating steam using the exhaust gas generated in the gas turbine generator, this steam is used as the driving power for the LNG revaporizer and the steam turbine generator added for electric power generation, It is possible to reduce the cost of the entire facility by waste heat recovery as much as possible, thereby reducing costs, and to prevent marine pollution through the use of waste heat.

It is the schematic which shows the floating type LNG re-vaporization equipment by a prior art. It is the schematic which shows the state by which the electric power production equipment was attached to the floating-type LNG re-vaporization equipment by one embodiment of the present invention.

  Hereinafter, the floating LNG re-vaporization facility according to the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 2, the floating LNG revaporization facility according to an embodiment of the present invention includes an LNG storage tank 10, an LNG revaporizer 20, and a power production facility capable of producing electric power.

  Here, the power production facility is configured to produce electric power through a gas turbine generator 30 that is operated by the revaporized gas produced in the LNG revaporizer 20.

  The floating LNG re-vaporization facility according to an embodiment of the present invention further includes an exhaust gas heat exchanger 40 that generates high-temperature steam using the exhaust gas generated in the gas turbine generator 30.

  Here, the LNG revaporizer 20 uses the steam generated in the exhaust gas heat exchanger 40 as an energy source for LNG revaporization.

  Further, the steam generated in the LNG revaporizer 20 is converted into water and reused as condensed water for generating steam in the exhaust gas heat exchanger 40.

  In addition, the floating LNG re-vaporization facility according to an embodiment of the present invention uses the water discharged from the LNG re-vaporizer 20 to use the air-conditioning system on the gas turbine generator 30 and other re-vaporization facilities. The heat exchanger 50 that cools the high-temperature cooling water discharged from the above is provided.

  Here, the heat obtained through the heat exchange of the heat exchanger 50 also serves to heat the water discharged from the LNG revaporizer 20.

  The floating LNG re-vaporization facility according to an embodiment of the present invention further includes a steam turbine generator 60 that generates electricity using steam generated in the exhaust gas heat exchanger 40 as a power production facility.

  Further, the water discharged from the steam turbine generator 60 is mixed with the water discharged from the LNG revaporizer 20 and supplied to the heat exchanger 50.

  Meanwhile, the floating LNG revaporization facility according to an embodiment of the present invention further includes a supply flow path 70 for supplying exhaust gas generated in the exhaust gas heat exchanger to the LNG revaporizer.

  Reference numeral 81 denotes a low-pressure pump in the LNG tank 10, 82 denotes a buffer tank, 83 denotes a high-pressure pump, and 84 denotes a flow control valve.

  Reference numeral 85 indicates a gas flow meter, 86 indicates a distributor, 87 indicates a transformer, and 88 indicates a circulation pump.

  The floating LNG re-vaporization facility according to an embodiment of the present invention having such a configuration basically supplies LNG from the LNG storage tank 10 via the low-pressure pump 81, the buffer tank 82, and the high-pressure pump 83. Then, gas is produced in the LNG revaporizer 20, and electric power production equipment is attached thereto to produce electric power.

  Hereinafter, the electric power production process through the electric power production facility will be described. First, a gas turbine generator 30 is disposed as the electric power production facility, and the gas is generated using the revaporized gas produced in the LNG revaporizer 20. The turbine generator 30 is operated to produce electric power.

  Here, the exhaust gas generated in the gas turbine generator 30 is subjected to heat exchange with condensed water in the exhaust gas heat exchanger 40 to generate steam, and is then discharged to the atmosphere.

  The high-temperature steam obtained by the heat exchange is used as an energy source for LNG re-vaporization of the LNG re-vaporizer 20.

  That is, from this point of time, the LNG revaporizer 20 can be operated using the steam generated in the exhaust gas heat exchanger 40 without using diesel as a starting fuel.

  Further, the steam generated in the LNG revaporizer 20 is converted into water and reused as condensed water for generating steam in the exhaust gas heat exchanger 40.

  At this time, the steam that has passed through the LNG revaporizer 20 is converted into water (approximately 20 ° C.) and sent to the heat exchanger 50. Thereafter, heat is exchanged in this heat exchanger 50 with high-temperature (approximately 60 ° C.) cooling water discharged from an air conditioning system on the gas turbine generator 30 or other re-vaporization equipment. It is converted into cooling water (approximately 30 ° C.) and reused as cooling water for the gas turbine generator 30 and the air conditioning system on the revaporization facility.

  On the other hand, a part of the steam generated in the exhaust gas heat exchanger 40 is sent to a steam turbine generator 60 that generates electricity to generate electricity.

  The water (approximately 40 ° C.) discharged from the steam turbine generator 60 is mixed with the water discharged from the LNG revaporizer 20 and supplied to the heat exchanger 50.

  At this time, the water subjected to heat exchange in the heat exchanger 50 becomes approximately 45 to 50 ° C. and is sent to the exhaust gas heat exchanger 40 as condensed water through the circulation pump 88.

  On the other hand, the exhaust gas discharged from the exhaust gas heat exchanger 40 is supplied again to the LNG revaporizer 20 via a separate supply channel 70.

  Thus, according to the present invention, gas can be produced through the LNG revaporizer 20, and the gas turbine generator 30 can be driven using the revaporized gas to generate electricity. Since steam can be produced using the exhaust gas of the gas turbine generator 30 and used as a driving raw material for the LNG revaporizer 20 and the steam turbine generator 60, not only efficient use of energy but also prevention of marine pollution is possible. Various effects such as can be obtained.

  The floating LNG re-vaporization equipment according to the present invention has been described with reference to the preferred embodiment of the present invention. However, the present invention is not limited to the embodiment in which the above-described embodiment is simply combined with the existing known technology. In the claims and the detailed description of the invention, it should be recognized that the technology to which those skilled in the art to which the present invention pertains can simply modify the present invention is included in the technical scope of the present invention. Should be done.

10: LNG tank 20: LNG revaporizer 30: gas turbine generator 40: exhaust gas heat exchanger 50: heat exchanger 60: steam turbine generator 70: supply flow path 81: low pressure pump 82: buffer tank 83: high pressure pump 84: Flow control valve 85: Gas flow meter 86: Distributor 87: Transformer 88: Circulation pump

Claims (7)

In a floating LNG revaporization facility comprising an LNG storage tank (10) and an LNG revaporizer (20),
In addition to gas production through the LNG revaporizer (20), it further comprises an electric power production facility capable of producing electric power ,
The power production facility produces electric power through a gas turbine generator (30) operated by the re-vaporized gas produced in the LNG re-vaporizer (20),
An exhaust gas heat exchanger (40) that generates high-temperature steam using the exhaust gas generated in the gas turbine generator (30);
The floating LNG revaporization facility further comprising a supply flow path (70) for supplying exhaust gas generated in the exhaust gas heat exchanger (40) to the LNG revaporizer (20) . The floating type according to claim 1 , wherein the LNG revaporizer (20) uses steam generated in the exhaust gas heat exchanger (40) as an energy source for LNG revaporization. LNG re-vaporization equipment. The steam generated in the LNG regasification vessel (20) is converted into water, in claim 2, characterized in that it is reused as a condensed water for the generation of steam in the exhaust gas heat exchanger (40) Floating LNG re-vaporization equipment described. The floating LNG revaporization equipment according to claim 3 , further comprising a heat exchanger (50) for heating water discharged from the LNG revaporizer (20) to convert it into high-temperature condensed water. . The heat exchanger (50) uses the cooling water discharged from the LNG revaporizer (20), and the high temperature discharged from the air turbine system on the gas turbine generator (30) and other revaporization facilities. The cooling LNG re-vaporization equipment according to claim 4 , wherein the cooling water is cooled. The floating LNG revaporization facility according to claim 1 , further comprising a steam turbine generator (60) that generates electricity using steam generated in the exhaust gas heat exchanger (40). Water discharged from the steam turbine generator (60), in claim 6, characterized in that it is mixed with water discharged from the LNG regasification vessel (20) is supplied to the heat exchanger (50) Floating LNG re-vaporization equipment described.