JP4873968B2 - Air temperature type LNG vaporizer heating method, heating device, and cogeneration system - Google Patents

Description

  According to the present invention, an air temperature type carburetor used in a system using a gas combustion driving engine such as a gas engine or a gas turbine using liquefied natural gas (LNG) as a fuel brings about a function deterioration in a short time due to frost formation. The present invention relates to a heating method, a heating device, an exhaust gas heat exchanger, and a cogeneration system for an air temperature type LNG vaporizer that can solve the problem.

  Liquefied natural gas (LNG) is transported and stored by sea on a dedicated ship to a receiving terminal in the demanding country in a state in which the volume is condensed after being refined, cooled and liquefied in the gas producing country. Gas obtained by vaporizing LNG is used for various purposes, but recently, it is increasingly used for cogeneration systems including gas power generation, hot water supply, and air conditioning. In a cogeneration system, a tank that stores LNG, a vaporizer that heats and vaporizes LNG supplied from the tank, a gas engine that is driven by burning gas supplied from the vaporizer, a gas turbine, and the like For example, by driving the generator using the driving force output from the gas combustion drive engine to generate power and burning the gas in the gas combustion drive engine Hot water or steam is generated by the obtained heat so that it can be used for various purposes.

When realizing a cogeneration system in a small-scale facility such as a hotel, hospital, factory, etc., as a vaporizer, a cold water vaporizer that vaporizes LNG by heat exchange with water, or heat exchange with hot water heated by steam Conventionally, a hot water vaporizer that vaporizes LNG is generally used.
In addition, an air temperature type vaporizer that vaporizes LNG by heat exchange with the atmosphere has been known, but the air temperature type vaporizer is excellent in terms of running cost, but the equipment cost, installation area, failure It is inferior to the cooling water type and the hot water type in terms of frequency and maintenance frequency. Air temperature vaporizers are not suitable for large-scale facilities because of their limited vaporization capacity, and are suitable for small-scale facilities. In other words, the air temperature carburetor has a simple structure that does not use an external heating medium and is equipped with a heat dissipating part (heat dissipating fins) with few moving parts, so that the running cost is low. On the other hand, it has a merit that it can be suppressed. However, when it is used in winter or in a cold region, it tends to be avoided because of frost formation on the heat radiation fins and generation of white smoke due to freezing of moisture in the air.

  When frost is formed on the heat radiation fins of the air temperature type vaporizer, there is a disadvantage that the heat radiation ability is remarkably lowered and the vaporization ability of the vaporizer is lowered, so that continuous use is impossible. Therefore, by arranging two air temperature type vaporizers having the same level of vaporization capacity at a predetermined sufficient interval on the same site, the air temperature type vaporizers in operation by frosting are usually used. When the time required for the vaporization capacity to drop has elapsed, an alternate operation method was often adopted in which the operation was switched to another air temperature type vaporizer that had been stopped until then. However, if two carburetors are permanently installed in this way, not only will the problem be that the equipment cost and site area will be enormous, but also an accessory device including a device for switching the carburetor will be required, so failure will also occur. It tends to occur. In addition, when the vaporizer in the stopped state is operated, there is no heat source for heating and vaporizing the LNG introduced into the vaporizer, so that there is a problem that it takes time to start up. In winter, it is necessary to patrol frequently in order to monitor the frost formation. On the other hand, if additional heaters, defrosting watering devices (warm water) devices or blower fans are installed to prevent frost formation on the heat radiation part of the air temperature type vaporizer, equipment costs and running costs may increase. there were.

  The white smoke generated from the air temperature vaporizer is colder and heavier than air, so it stays near the surface of the earth, causing deterioration of the concrete foundation and freezing of pipes. . White smoke generated in large quantities from a vaporizer is harmless to the human body, etc., but it not only causes anxiety to the psychology of local residents, but also when there are roads, etc. near the vaporizer, May interfere with the visibility of the traffic and may cause traffic.

Patent Document 1 discloses an exhaust heat recovery type LNG vaporizer that recovers heat from a high-temperature turbine exhaust gas using a heat medium passing through a circulation line and transmits the recovered heat to the LNG via a heat exchanger. However, this heating medium is a liquid and is therefore not related to an air temperature vaporizer. Therefore, this publication does not disclose any configuration for solving the problems of frost formation on the heat radiating part and generation of white smoke, which are defects of the air temperature type vaporizer.
Patent Document 2 discloses a vaporizer that vaporizes LNG using heat obtained from high-temperature combustion exhaust gas from a gas turbine or the like and latent heat due to solidification / melting of the heat storage material. The cooler is not an air temperature type vaporizer, and no configuration is disclosed for solving the problems of frost formation on the heat radiating part and generation of white smoke, which are defects of the air temperature type vaporizer.

Gas combustion drive engines such as gas engines and gas turbines generate high-temperature (about 400 ° C.) exhaust gas along with gas combustion and supply cooling air to the casing of the overheated gas combustion drive engine. As a result, the warm air heated to the casing temperature (atmospheric temperature + about 5 to 10 ° C.) is discharged. Conventionally, these exhaust gas and warm air have been exhausted into the atmosphere, but no method of using them has been found, so energy has been wasted.
Japanese Examined Patent Publication No. 6-70233 JP-A-8-209158

As described above, since there have been various problems in using an air temperature type vaporizer as a conventional small-scale LNG vaporizer, a cold water type or a hot water type vaporizer has been generally employed.
In other words, the air temperature type vaporizer uses the heat of the atmosphere, so the running cost can be kept low. However, when operating continuously for a long time, the heat exchanging part (heat radiating part) is frosted and the vaporization ability is reduced. Therefore, it is necessary to prepare a spare machine for switching and perform the switching operation, resulting in an increase in equipment cost and an installation area. In order to alleviate frost formation, a method in which a fan is installed in an air temperature type vaporizer and forced ventilation is used, or a method in which warm water is sprayed is adopted, but both initial cost and running cost increase.

In addition, in the air temperature type vaporizer, in order to exchange heat between the extremely low temperature LNG and the heat of the atmosphere, low temperature white smoke (those in which moisture in the air is frozen) is released into the atmosphere. There was a problem that there was an adverse effect such as freezing and deterioration of the concrete foundation and freezing of the pipes, and there was a problem that additional cost was required. White smoke is harmless, but the impression of local residents is also bad.
On the other hand, in a gas combustion drive engine such as a gas engine to which vaporized LNG is supplied, heat accumulated in the casing or high-temperature exhaust gas is released to the atmosphere by an exhaust fan and has not been recovered. Was wasted.
Moreover, when operating the vaporizer which was in a stop state, there was a problem that it took time to start up.

The present invention has been made to solve the above-described problems of the prior art, and is an air temperature type used in a system using a gas combustion driving engine such as a gas engine or a gas turbine using liquefied natural gas as a fuel. The carburetor not only solves the problems of frosting causing a short-term deterioration of function or generating white smoke, but also efficiently recovers and attaches high-temperature exhaust gas generated from the gas combustion drive engine. An object of the present invention is to provide an air temperature type LNG vaporizer heating method, a heating device, an exhaust gas heat exchanger, and a cogeneration system that can be used to prevent frost and white smoke.
Another object of the present invention is to shorten the rise time even when starting operation of a vaporizer that has been in a stopped state in winter or the like.

A method of heating an air temperature type LNG vaporizer according to the invention of claim 1 includes: an air temperature type LNG vaporizer that vaporizes at least liquefied natural gas; and burning natural gas vaporized by the LNG vaporizer In a cogeneration system including a gas combustion drive engine to be driven , hot air discharged by a casing internal ventilation fan of the gas combustion drive engine is heated by high-temperature exhaust gas discharged from the gas combustion drive engine. The high-temperature air generated by the above is supplied to the LNG vaporizer and heated.
The air temperature type vaporizer is equipped with a configuration for vaporizing low-temperature liquefied natural gas of about minus 160 ° C by heat exchange with the atmosphere. The surrounding air tends to be a large amount of white smoke. In the present invention, in order to effectively use the high-temperature exhaust gas generated by the operation of the gas combustion drive engine, the air heated by using the high-temperature exhaust gas is supplied to the radiator of the vaporizer to prevent frost formation and white smoke. It can be supplied to other parts of the vaporizer to supplement the vaporization ability.
Further, as the air heated by the high-temperature exhaust gas, by using the warm air heated by blowing with a fan to cool the gas combustion driving engine itself, it is efficient without using any special forced air blowing means. The vaporizer can be heated.

Invention 請 Motomeko 2, the hot air, characterized in that it is supplied to the heat radiating portion of the vaporizer.
By supplying high-temperature air to the heat dissipation part of the vaporizer, frost formation and white smoke can be effectively prevented.

The invention of claim 3 is characterized in that, in claim 1 or 2 , the temperature of the high-temperature air supplied to the heat radiating portion is a temperature sufficient to remove or prevent frost formation on the heat radiating portion. To do.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the high-temperature air is used as a heat source for vaporizing the liquefied natural gas supplied into the vaporizer.
It is also possible to use high-temperature air as auxiliary heating means for vaporizing the liquefied natural gas introduced into the vaporizer.

A heating apparatus for an air temperature type LNG vaporizer according to the invention of claim 5 is driven by burning an air temperature type LNG vaporizer that vaporizes liquefied natural gas and the natural gas vaporized by the LNG vaporizer. An exhaust gas heat exchanger that generates hot air by heating hot air generated by a fan that cools the gas combustion drive engine with high-temperature exhaust gas discharged from the gas combustion drive engine; And high temperature air supply means for supplying high temperature air generated by the exhaust gas heat exchanger to an appropriate place of the LNG vaporizer.
The invention of claim 6 is an air temperature type LNG vaporizer for vaporizing liquefied natural gas, a gas combustion drive engine driven by burning natural gas vaporized by the LNG vaporizer, and the gas combustion drive engine The hot air generated by the generator that operates with the driving force from the generator and the fan that cools the gas combustion drive engine is heated by the high-temperature exhaust gas discharged from the gas combustion drive engine to generate hot air Exhaust gas heat exchanger, and high temperature air supply means for supplying high temperature air generated by the exhaust gas heat exchanger to an appropriate place of the LNG vaporizer.
The invention of claim 7 is an air temperature type LNG vaporizer for vaporizing liquefied natural gas, a gas combustion drive engine driven by burning natural gas vaporized by the LNG vaporizer, and the gas combustion drive engine An exhaust gas heat exchanger that generates high-temperature air by exchanging heat of the high-temperature exhaust gas discharged from the exhaust gas, and high-temperature air supply means that supplies the high-temperature air generated by the exhaust gas heat exchanger to an appropriate location of the LNG vaporizer The exhaust gas heat exchanger includes an exhaust gas supply pipe that supplies high-temperature exhaust gas discharged from the gas combustion drive engine, and hot air that supplies warm air heated by the gas combustion drive engine A casing that communicates and connects each of the feed pipes; and a heat exchange member that is filled in the casing and heats the hot air with the high-temperature exhaust gas to form high-temperature air. That.
The invention of claim 8 includes an air temperature type LNG vaporizer that vaporizes liquefied natural gas, a gas combustion drive engine that is driven by burning natural gas vaporized by the LNG vaporizer, and the gas combustion drive engine A generator that generates electric power by operating with a driving force from the exhaust gas, an exhaust gas heat exchanger that generates high-temperature air by exchanging heat from the high-temperature exhaust gas discharged from the gas combustion drive engine, and the exhaust gas heat exchanger High-temperature air supply means for supplying the high-temperature air to the appropriate place of the LNG vaporizer, and the exhaust gas heat exchanger supplies an exhaust gas feed pipe for feeding the high-temperature exhaust gas discharged from the gas combustion drive engine, And a casing for communicating and connecting hot air supply pipes for supplying hot air heated by the gas combustion drive engine, respectively, and the casing filled with the high-temperature exhaust gas Characterized by comprising a heat exchanger member according to the hot air to heat the air, the.

The invention of claim 9 includes an air temperature type LNG vaporizer for vaporizing liquefied natural gas, a gas combustion drive engine driven by burning the natural gas vaporized by the LNG vaporizer, and the gas combustion drive engine An exhaust gas heat exchanger that generates high-temperature air by exchanging heat of the high-temperature exhaust gas discharged from the exhaust gas, and high-temperature air supply means that supplies the high-temperature air generated by the exhaust gas heat exchanger to an appropriate location of the LNG vaporizer And an electric heater for heating the air temperature type LNG vaporizer when the air temperature type LNG vaporizer is activated.
The invention of claim 10 includes an air temperature type LNG vaporizer for vaporizing liquefied natural gas, a gas combustion drive engine driven by burning natural gas vaporized by the LNG vaporizer, and the gas combustion drive engine A generator that generates electric power by operating with a driving force from the exhaust gas, an exhaust gas heat exchanger that generates high-temperature air by exchanging heat from the high-temperature exhaust gas discharged from the gas combustion drive engine, and the exhaust gas heat exchanger A high-temperature air supply means for supplying the high-temperature air to an appropriate position of the LNG vaporizer; and an electric heater for heating the air-temperature LNG vaporizer when the air-temperature LNG vaporizer is activated. And
An eleventh aspect of the invention is characterized in that, in any one of the fifth to tenth aspects, the high-temperature air is supplied to a heat radiating portion of the vaporizer.
A twelfth aspect of the invention is characterized in that, in the eleventh aspect , the temperature of the high-temperature air supplied to the heat radiating portion is a temperature sufficient to remove or prevent frost formation on the heat radiating portion.
A thirteenth aspect of the invention is characterized in that, in any one of the fifth to twelfth aspects, the high-temperature air is used as a heat source for vaporizing the liquefied natural gas supplied into the vaporizer.

A cogeneration system according to a fourteenth aspect of the present invention includes the air temperature type LNG vaporizer heating device according to any one of the fifth to thirteenth aspects.

  According to the heating method, the heating device, and the cogeneration system of the air temperature type LNG vaporizer according to the present invention, the hot air after cooling the casing of the gas combustion driving engine such as the gas engine to which the LNG is supplied. After being recovered by the duct, it is heated with the high-temperature exhaust gas discharged from the gas engine, and then forced to ventilate the air temperature type vaporizer. It can be effectively prevented and eliminated. In winter, an electric heater can also be used together to function as a heat source for the vaporizer at startup.

  Gas combustion driving engines such as gas engines can use the driving force for power generation and exhaust heat can be used for steam and hot water generation, but the exhaust gas after combustion is effective despite its high temperature However, according to the present invention, it is possible to effectively use the heat of the exhaust gas for preventing frosting of the vaporizer. At this time, it is not necessary to add a special blower fan or power for that purpose, so that cost reduction can be realized. In addition, since one carburetor can be operated continuously for a long time, a backup spare unit is not necessary, and further cost reduction and installation space reduction can be realized.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
FIG. 1 is a diagram showing a schematic configuration of a cogeneration system according to an embodiment of the present invention. This cogeneration system (hereinafter referred to as a cogeneration system) includes an LNG supply facility (satellite base) 1 and an exhaust heat utilization system 20.
The LNG supply facility 1 includes a tank 3 that stores liquefied natural gas (LNG) supplied from an LNG container 2 that has been pulled by a tank truck, and an air temperature type LNG vaporizer (hereinafter referred to as a vaporizer) according to the present invention. ) 4, a pressurized evaporator 5, a BOG warmer 6, and pipes that connect these components.
The carburetor 4 includes a large number of heat radiation fins 4b on the outer surface of the casing 4a, and an LNG container 2 and a tube body 7 for circulating LNG supplied from the tank 3 are disposed inside the casing 4a. Moreover, the electric heater 8 for heating the suitable place of the casing 4a, for example, the radiation fin (radiation part) 4b, and the pipe body 7 inside a casing is arrange | positioned.

  The exhaust heat utilization system 20 is a gas combustion drive engine having a configuration for driving a piston and rotating an output shaft by receiving and burning the vaporized gas supplied from the vaporizer 4 into a cylinder. Air-cooling the gas engine 21, the generator 22 that generates power by rotating the turbine using the driving force of the output shaft of the gas engine 21, and the casing that has been heated by blowing air toward the casing of the gas engine 21 A cooling ventilation fan (not shown), a hot air feed pipe (warm air duct) 25 that conveys warm air heated by the heat of the casing 4 a by being blown by the fan, and a gas engine 21. Exhaust gas supply pipe 26 that conveys the exhausted high-temperature exhaust gas to the outside, hot air from the hot air duct 25, and exhaust gas supply pipe 26 An exhaust gas heat exchanger 30 for supplying the high temperature gas to the heat exchange member 32 accommodated in the casing 31, and hot air (high temperature air) heated by the high temperature exhaust gas in the exhaust gas heat exchanger 30 and further heated. A high-temperature air supply pipe (high-temperature air supply means) 35 to be supplied to the radiation fins 4b of the vessel 4, a high-temperature exhaust gas discharge pipe 40 for supplying the high-temperature exhaust gas that has passed through the exhaust gas heat exchanger 30 to the exhaust heat utilization system in the next stage, It has.

The gas combustion drive engine 21 is not limited to a gas engine, and a gas turbine, a boiler, or the like can be used. The generator 22 is not essential, and only the exhaust heat may be used in the exhaust heat utilization system at the subsequent stage.
The high-temperature exhaust gas from the high-temperature exhaust gas exhaust pipe 40 is supplied to, for example, an exhaust heat recovery boiler (not shown) and used to generate steam.
The gas engine 21, the exhaust gas heat exchanger 30, and the high temperature air supply pipe 35 constitute a heating device for an air temperature type LNG vaporizer.

One of the characteristic configurations of the heating method of the air temperature type LNG vaporizer or the heating device of the air temperature type LNG vaporizer according to the present invention is the high temperature exhausted from the gas combustion driving engine such as the gas engine 21. The high temperature air generated by heat exchange of the exhaust gas is supplied to the radiating fins 4b of the carburetor 4 to prevent frosting on the radiating fins 4b and generation of white smoke.
This high-temperature air is heated by exhaust gas (about 400 ° C.), for example, by heating warm air (atmospheric temperature + about 5 to 10 ° C.) in which the cooling air blown from the fan with respect to the casing outer surface of the gas engine 21 is heated. The temperature is raised to about ℃. In order to efficiently supply this high temperature air to the radiating fins 4b of the vaporizer, it is effective to use the high temperature air supply pipe 35. Or you may comprise so that high temperature air may be supplied to the pipe body 7 in the casing 4a of a vaporizer, and vaporization may be accelerated | stimulated.

Next, FIGS. 2A and 2B are an external view showing the configuration of an example of the exhaust gas heat exchanger of the present invention, and an explanatory diagram of a configuration example of a heat exchange medium accommodated inside the heat exchanger.
The exhaust gas heat exchanger 30 is means for generating high-temperature air by exchanging heat of the high-temperature exhaust gas discharged from the gas engine 21.
That is, the exhaust gas heat exchanger 30 includes an exhaust gas supply pipe 26 that supplies high-temperature exhaust gas from the gas engine 21, and a hot air supply pipe 25 that supplies warm air heated by the gas engine 21. A casing 31 to be connected in a state of communicating with the inside, a heat exchange member 32 filled in the casing 31, and high-temperature exhaust gas supplied from the exhaust gas feed pipe 26 into the casing 31 and passing through the heat exchange member 32 are removed from the casing. The hot air generated by heating the hot air supplied into the casing 31 from the hot air exhaust pipe 40 and the hot air feed pipe 25 through the heat exchange member 32 to the outside of the casing. A high-temperature air supply pipe 35 for discharging.

  As the heat exchanging member 32, for example, as shown in FIG. 2B, a plurality of corrugated sheets (corrugated) 32a are laminated, and a ventilation space is formed between the corrugated sheets. The ventilation spaces adjacent to each other in the vertical position are configured not to communicate with each other, and the high-temperature exhaust gas discharged from the exhaust gas supply pipe 26 and the hot air supply pipe 25 are discharged into the ventilation spaces, respectively. Warm air is supplied, and heat from the high-temperature exhaust gas is configured to efficiently heat the warm air via each corrugated plate member 32a. That is, the exhaust gas from the exhaust gas supply pipe is branched and supplied to each dedicated ventilation space communicated with the outlet of the exhaust gas supply pipe 26. On the other hand, high-temperature air from the high-temperature air supply pipe is branched and supplied to each dedicated ventilation space communicated with the outlet of the hot-air supply pipe 25. The high temperature exhaust gas (about 300 to 350 ° C.) that has passed through each ventilation space dedicated to the high temperature exhaust gas is supplied to the downstream side through the exhaust gas exhaust pipe 40. The warm air that has passed through each ventilation space dedicated to warm air becomes high-temperature air (about 100 ° C.) and is supplied from the high-temperature air supply pipe 35 to the vaporizer 4.

  In a low temperature environment such as winter, when the vaporizer 4 is in a cooled state, the vaporizer 4 is appropriately heated, for example, the casing 4a and the LNG distribution tube 7 are preheated using an electric heater to start vaporization. In this state, the gas engine is started in this state. Specifically, preheating is performed by, for example, winding a heater wire around a vaporizer to generate heat. After the gas engine is started, the heat dissipating part is heated by the high-temperature air heated by the high-temperature exhaust gas, so that a stable operation state can be maintained. It is also possible to prevent initial frost formation by winding the heater wire around the radiating fin.

  As described above, according to the air temperature type LNG vaporizer of the present invention, it is not necessary to provide a special blowing means unlike the conventional forced ventilation type air temperature type vaporizer, and the heat exchanger 30 is installed in the existing equipment. In addition, by supplying the high temperature air heated by the heat exchanger 30 to the vaporizer 4 through the high temperature air supply pipe 35, the occurrence of frost formation can be prevented. That is, in the present invention, hot air heated by heat from the outer surface of the casing of the gas engine is heated by high-temperature exhaust gas from the gas engine to form high-temperature air. By supplying to this part, frost formation can be prevented or vaporization can be promoted. For this reason, while reducing the installation cost and power cost of the fan for forced ventilation, it is possible to prevent the suspension of operation due to frosting and enable continuous operation for a long time while increasing the amount of exhaust heat recovery from the exhaust gas. Can do. Further, if the vaporizer can be operated continuously for a long time, a spare device for switching becomes unnecessary, and the initial cost can be reduced and the space can be saved. In addition, the air that is ventilated to the heat dissipating part of the vaporizer is sufficiently heated, so it is possible to suppress the generation of low-temperature white smoke in which moisture in the air becomes ice, and measures to prevent freezing of the foundation concrete part and piping. It becomes unnecessary and daily inspection becomes easy. In addition, there is no need to worry about the negative effects of white smoke on the surroundings.

  Further, in the present invention, the high-temperature air supply pipe 35 connects the heat exchanger 30 to the vaporizer 4, so that the vaporizer and the heat exchanger or the vaporizer and the gas engine are separated from each other. Even if it is, the connection between the two is easy.

It is a figure showing a schematic structure of a cogeneration system concerning one embodiment of the present invention. (A) And (b) is an external view which shows the structure of an example of the exhaust gas heat exchanger of this invention, and explanatory drawing of the structural example of the heat exchange medium accommodated in a heat exchanger.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... LNG supply equipment, 2 ... LNG container, 3 ... Tank, 4 ... Vaporizer, 4a ... Casing, 4b ... Radiation fin, 5 ... Pressure evaporator, 6 ... BOG warmer, 7 ... Tube, 8 ... Electric heater, 20 ... exhaust heat utilization system, 21 ... gas engine (gas combustion drive engine), 22 ... generator, 25 ... warm air feed pipe, 26 ... exhaust gas feed pipe, 30 ... exhaust gas heat exchanger, 31 ... Casing, 32 ... heat exchange member, 32a ... corrugated plate material, 35 ... hot air supply pipe, 40 ... hot exhaust gas discharge pipe.

Claims (14)

In a cogeneration system comprising at least an air temperature type LNG vaporizer that vaporizes liquefied natural gas, and a gas combustion drive engine that is driven by burning natural gas vaporized by the LNG vaporizer,
The hot air generated by heating the hot air discharged from the casing internal ventilation fan of the gas combustion driving engine with the high temperature exhaust gas discharged from the gas combustion driving engine is supplied to the LNG vaporizer and added. A method for heating an air temperature type LNG vaporizer, characterized by heating. The method for heating an air temperature type LNG vaporizer according to claim 1 , wherein the high temperature air is supplied to a heat radiating portion of the vaporizer. 3. The air-temperature LNG vaporization according to claim 1, wherein the temperature of the high-temperature air supplied to the heat radiating unit is a temperature sufficient to remove or prevent frost formation on the heat radiating unit. How to heat the vessel. The said high temperature air is utilized as a heat source which vaporizes the liquefied natural gas supplied in the said vaporizer, The addition of the air temperature type | mold LNG vaporizer as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned. Warm method. Generated by an air temperature type LNG vaporizer for vaporizing liquefied natural gas, a gas combustion drive engine driven by burning the natural gas vaporized by the LNG vaporizer, and a fan for cooling the gas combustion drive engine and the exhaust gas heat exchanger to produce hot air by heating by hot air high temperature exhaust gas discharged from the gas combustion driving engine, the hot air generated by the exhaust gas heat exchanger in place of the LNG vaporizer A heating device for an air temperature type LNG vaporizer, comprising: a high temperature air supply means for supplying. An air temperature type LNG vaporizer that vaporizes liquefied natural gas, a gas combustion driving engine that is driven by burning the natural gas vaporized by the LNG vaporizer, and a driving force from the gas combustion driving engine. An exhaust gas heat exchanger that generates hot air by heating hot air generated by a fan that cools the gas combustion drive engine with hot exhaust gas discharged from the gas combustion drive engine; And a high-temperature air supply means for supplying high-temperature air generated by the exhaust gas heat exchanger to an appropriate place of the LNG vaporizer.   An air temperature LNG vaporizer that vaporizes liquefied natural gas, a gas combustion drive engine that is driven by burning the natural gas vaporized by the LNG vaporizer, and high-temperature exhaust gas that is discharged from the gas combustion drive engine An exhaust gas heat exchanger that generates high-temperature air by exchanging heat, and high-temperature air supply means that supplies the high-temperature air generated by the exhaust gas heat exchanger to an appropriate position of the LNG vaporizer,
  The exhaust gas heat exchanger includes an exhaust gas feed pipe for feeding high temperature exhaust gas discharged from the gas combustion drive engine, and a hot air feed pipe for feeding warm air heated by the gas combustion drive engine. An air temperature type LNG vaporizer comprising: a casing that is connected in communication with each other; and a heat exchange member that is filled in the casing and heats the warm air with the high-temperature exhaust gas to form high-temperature air. Heating device.   An air temperature type LNG vaporizer that vaporizes liquefied natural gas, a gas combustion driving engine that is driven by burning the natural gas vaporized by the LNG vaporizer, and a driving force from the gas combustion driving engine. A generator that generates electric power, an exhaust gas heat exchanger that generates high-temperature air by exchanging heat of the high-temperature exhaust gas discharged from the gas combustion drive engine, and the high-temperature air generated by the exhaust gas heat exchanger High temperature air supply means for supplying to a proper place of the vaporizer,
  The exhaust gas heat exchanger includes an exhaust gas feed pipe for feeding high temperature exhaust gas discharged from the gas combustion drive engine, and a hot air feed pipe for feeding warm air heated by the gas combustion drive engine. An air temperature type LNG vaporizer comprising: a casing that is connected in communication with each other; and a heat exchange member that is filled in the casing and heats the warm air with the high-temperature exhaust gas to form high-temperature air. Heating device.   An air temperature LNG vaporizer that vaporizes liquefied natural gas, a gas combustion drive engine that is driven by burning the natural gas vaporized by the LNG vaporizer, and high-temperature exhaust gas that is discharged from the gas combustion drive engine Exhaust gas heat exchanger that generates high-temperature air by exchanging heat, high-temperature air supply means for supplying high-temperature air generated by the exhaust gas heat exchanger to a suitable location of the LNG vaporizer, and the air temperature LNG vaporization And an electric heater for heating the air temperature type LNG vaporizer at the start-up of the gas generator.   An air temperature type LNG vaporizer that vaporizes liquefied natural gas, a gas combustion driving engine that is driven by burning the natural gas vaporized by the LNG vaporizer, and a driving force from the gas combustion driving engine. A generator that generates electric power, an exhaust gas heat exchanger that generates high-temperature air by exchanging heat of the high-temperature exhaust gas discharged from the gas combustion drive engine, and the high-temperature air generated by the exhaust gas heat exchanger A high temperature air supply means for supplying a proper temperature to the vaporizer, and an electric heater for heating the air temperature type LNG vaporizer when the air temperature type LNG vaporizer is started up. Device heating device. The heating device for an air temperature type LNG vaporizer according to any one of claims 5 to 10 , wherein the high-temperature air is supplied to a heat radiating portion of the vaporizer. Temperature of hot air supplied to the heat radiation member, the air temperature-LNG vaporizer of claim 11, wherein a temperature that can remove or prevent frost formation on the heat radiating portion Heating device. 13. The air temperature type LNG vaporizer according to claim 5 , wherein the high temperature air is used as a heat source for vaporizing the liquefied natural gas supplied into the vaporizer. Temperature device. A cogeneration system comprising the air temperature type LNG vaporizer heating device according to any one of claims 5 to 13 .

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