JP7146070B2 - mobile - Google Patents

Description

The present invention relates to a moving object equipped with a cooling device for cooling air supplied to combustion means in a power generation system.

A combined cycle power generation system supplies combustion gas generated by a combustion means to a gas turbine to rotate the gas turbine. This is a system in which heat is recovered by a heat recovery boiler to generate steam, and the generated steam rotates a steam turbine.

This type of combined-cycle power generation system is not only used in power plants on land, but in recent years, it is also being considered for use outside of land because it is a system capable of exhibiting high power generation efficiency.

For example, Patent Literature 1 discloses a marine power generation system mounted on a ship for the purpose of generating power on board. This marine power generation system is a power generation system installed on a ship such as an LNG ship. Similar to the combined cycle power generation system, combustion gas is supplied to a gas turbine to generate rotational power, and the rotational power of the gas turbine is generated. The generator generates electricity by the gas turbine, generates steam by recovering heat from the exhaust gas discharged from the gas turbine, and supplies the generated steam to the steam turbine to generate rotational power, and the rotational power of the steam turbine The generator will generate electricity.

JP 2018-141381 A

By the way, the gas turbine unit sucks and compresses atmospheric air, mixes it with fuel gas in the combustion means and burns it, and the generated combustion gas drives the gas turbine to rotate. When the temperature of the air supplied to the combustion means rises, the air density decreases, so the mass of the air sent to the combustion means decreases, resulting in a state of reduced output (in other words, a state of reduced power generation). ).

Therefore, in order to secure the required power generation without being influenced by the temperature of the air supplied to the combustion means, it is necessary to increase the number of installed gas turbine units.

However, increasing the number of installed gas turbine units causes problems such as an increase in cost. In particular, in a power generation system installed on a mobile body such as a ship, such as the ship power generation system described in Patent Document 1, space saving of the power generation system is required due to the space on the mobile body. In addition, the expansion of the installation space is also a big problem.

On the other hand, as a method for improving the decrease in the output of the gas turbine unit, a method of lowering the temperature of the air supplied to the combustion means has been conventionally proposed. As such a method, for example, there is a method in which mist is generated in the air intake chamber into which the air is sucked, and the air sucked into the air intake chamber takes away latent heat of vaporization from the mist, thereby cooling the air supplied to the combustion means. .

However, the method using mist can evaporate only the amount of mist up to the saturated vapor pressure corresponding to the atmospheric temperature. is used, there is a problem that the air supplied to the combustion means cannot be sufficiently cooled, and it is difficult to obtain the effect of recovering the output.

In particular, in a power generation system installed on a mobile body such as a ship, such as the ship power generation system described in Patent Document 1, the mobile body often moves in tropical regions, and the effect of output recovery cannot be sufficiently obtained. often.

In addition, as a method of lowering the temperature of the air supplied to the combustion means, in addition to installing a refrigerator that uses the combustion heat of the fuel to produce cold water, the cold water produced by the refrigerator (cold heat source) is used to heat the air. There is also a method of installing an exchanger in the intake chamber and using this cold water to cool the air supplied to the combustion means.

However, in the method of using chilled water from the refrigerator, if the chiller is to produce chilled water that can sufficiently cool the air to be supplied to the combustion means, the amount of heat input to the refrigerator and the amount of electric power input to the gas turbine unit will be different. There is a problem that the effect of output recovery is small and the energy efficiency of the entire power generation system is lowered. In addition, when trying to increase the amount of chilled water to be produced, there is a problem that the size of the refrigerator is unavoidable and the cost burden is large. Since space saving is demanded as described above, expansion of the installation space of the refrigerator is also a big problem.

In this way, with the above method alone, it is possible to save the power generation system while suppressing the problem that the effect of output recovery depends on the environment in which the power generation system is placed, and the decrease in the energy efficiency of the power generation system as a whole. There was a problem that it was difficult to suppress the decrease in the output of the gas turbine unit after realizing space saving.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a moving body equipped with a cooling device capable of efficiently cooling air supplied to combustion means and suppressing a decrease in the output of a gas turbine unit. as its purpose.

A mobile body according to the present invention for achieving the above object is characterized in that a mixture of air and fuel gas obtained by vaporizing a liquid fuel is combusted by a combustion means to generate a combustion gas, and the combustion means generates a combustion gas. Used in a power generation system comprising: a gas turbine unit in which a gas turbine is driven to rotate by combustion gas; and first power generation means for generating power using the rotational force of the gas turbine. A mobile body comprising a cooling device provided for
The cooling device includes a first cooling section that uses the heat medium used to vaporize the liquid fuel as a cold heat source, a second cooling section that uses the heat medium from the refrigerator as a cold heat source, and seawater as a heat medium. Of the third cooling units that use as a cold heat source, at least the first cooling unit and the third cooling unit, or the second cooling unit and the third cooling unit ,
a fuel tank storing the liquid fuel;
a vaporization unit that vaporizes the liquid fuel;
the gas turbine unit;
the first power generation means;
a waste heat recovery boiler unit for vaporizing water by exhaust gas from the gas turbine unit;
a steam turbine unit in which the steam turbine is rotationally driven by the steam vaporized in the heat recovery boiler unit;
a second power generation means for generating power using the rotational force of the steam turbine;
The steam turbine unit includes a condenser that recovers steam used to drive the rotation of the steam turbine as condensed water, and the seawater used in the third cooling section as a cold heat source. and a condensate cooling section for cooling the

According to the above characteristic configuration, the first cooling unit uses the heat medium used to vaporize the liquid fuel as the cold heat source, the second cooling unit uses the heat medium from the refrigerator as the cold heat source, and seawater as the heat medium. The air supplied to the combustion means is cooled in at least two cooling sections of the third cooling section using as a cold heat source.

For example, when only the cold heat of cold water (cold heat source) from the refrigerator is used as in the past, there is a problem that the cold heat of the cold water from the refrigerator cannot sufficiently cool the air in many cases. Another problem is that if you try to produce chilled water that can sufficiently cool the air, the energy efficiency of the entire power generation system will decrease, and if you try to increase the amount of chilled water produced, the size of the refrigerator will be unavoidable. could not be avoided. However, in the above-described characteristic configuration, the air supplied to the combustion means is cooled in at least two cooling units, so compared to the case where only the cold heat of the cold heat source from the refrigerator is used. , the air supplied to the combustion means can be sufficiently cooled while suppressing the occurrence of the above problems, and the effect of recovering the output of the power generation system can be easily obtained.

In addition, since the present invention is a moving body equipped with the cooling device as described above, for example, by moving the moving body to a place where a combined cycle power generation system not equipped with a cooling device is installed, A cooling device can be attached to this combined cycle power generation system, thereby suppressing a decrease in the output of the gas turbine unit.

Further, according to the above characteristic configuration, in the first cooling unit, the heat medium used for vaporizing the liquid fuel is used as a cooling source to cool the air supplied to the combustion means, and the air is cooled by the third cooling unit. In the part, cooling is performed using seawater as a heat medium as a cold heat source.
In a power generation system that uses a liquid fuel to generate power, a heat medium is inevitably generated by taking cold heat from the liquid fuel when the liquid fuel is vaporized. By using the heat medium as the cold heat source, the cold heat of the liquid fuel can be effectively utilized.
In addition, even if the cold heat obtained by vaporizing the liquid fuel consumed by the power generation system during power generation cannot lower the temperature of the air to a temperature that can suppress the decrease in the output of the power generation system, the third cooling In the section, the temperature of the air supplied to the combustion means can be lowered by cooling with the cold heat of seawater. This makes it easier to suppress a decrease in output of the power generation system.
Furthermore, since this characteristic configuration does not require a refrigerator, the problem of an increase in the size of the refrigerator does not occur, and it is possible to reduce the cost burden and save the space of the power generation system.
In this way, according to the moving body having the above characteristic configuration, the cold heat of the liquid fuel can be effectively used to cool the air supplied to the combustion means, and the decrease in energy efficiency of the entire power generation system can be suppressed. In addition, it is possible to cool the air supplied to the combustion means while reducing the cost burden and saving the space of the power generation system, thereby suppressing the decrease in the output of the gas turbine unit.
According to the above characteristic configuration, in the second cooling section, the air supplied to the combustion means is cooled by using the heat medium from the refrigerator as a cold heat source, and the air is used as the heat medium in the third cooling section. It is cooled by using sea water as a cold heat source.
As described above, unlike the case where only the cold heat of the cold heat source from the refrigerator is used, in the above characteristic configuration, cooling is performed not only by the cold heat source from the refrigerator, but also by using the cold heat of seawater. By using both, there is no need to cool the air only by the cold heat of the cold water from the refrigerator. Therefore, even if the air supplied to the combustion means is sufficiently cooled and the effect of recovering the output of the power generation system can be obtained, the decrease in energy efficiency of the power generation system as a whole can be suppressed, and the enlargement of the refrigerator can be avoided. Therefore, it is possible to reduce the cost burden and save the space of the power generation system.
In this way, according to the mobile body having the above characteristic configuration, the energy efficiency of the power generation system as a whole can be suppressed, the cost burden can be reduced, and the space of the power generation system can be reduced. The air supplied to the means can be cooled, which makes it possible to reduce the power reduction of the gas turbine unit.

According to the above characteristic configuration, the moving body is a moving body that includes the cooling device, the fuel tank, the vaporizing section, the gas turbine unit, and the first power generating means. The rotational force of the gas turbine causes the first power generation means to generate power. A moving body having such a configuration is equipped with the above cooling device, thereby suppressing a decrease in the energy efficiency of the power generation system as a whole, reducing the cost burden, and saving the space of the power generation system. In addition, the air supplied to the combustion means can be cooled, thereby suppressing a decrease in the output of the gas turbine unit and efficiently generating power.
Further, in the moving body according to the present invention, even if the area where the moving body moves or stops is a tropical region, the air supplied to the combustion means is cooled by the above-mentioned cooling device, and mist is generated as in the conventional case. Since it is not used, it is possible to obtain the effect of recovering the output of the power generation system.

According to the above characteristic configuration, the moving body further includes the heat recovery boiler unit, the steam turbine unit, and the second power generation means (in other words, the one equipped with the combined cycle power generation system). In the body, the thermal heat of the exhaust gas from the gas turbine unit is used to rotationally drive the steam turbine, and the rotational force of the steam turbine also generates electricity in the second power generating means. Therefore, it is possible to effectively use the heat of the exhaust gas from the gas turbine unit to efficiently generate power.

According to the above characteristic configuration, the seawater used in the third cooling unit is used as a cold heat source, the inside of the condenser is cooled in the condensate cooling unit, and the steam discharged from the steam turbine is transferred to the condenser. It can be cooled internally and recovered as condensate.
Therefore, since a part of the seawater piping for supplying seawater to the third cooling unit and the condensate cooling unit and recovering seawater from these cooling units can be shared, the arrangement of the piping can be simplified. , the number of pumps required for circulating seawater in the piping can be reduced.

Further, a further characteristic configuration of the moving body according to the present invention is that the cooling device supplies air to the combustion means in the order of the third cooling section and the first cooling section, or the third cooling section, The first and third cooling units or the second and third cooling units are arranged so as to flow in order from the second cooling unit.

As described above, the heat medium used as the cold heat source in the first cooling section obtains considerable cold heat from the liquid fuel, and its temperature is extremely low.
On the other hand, the temperature of the seawater used as a cold heat source in the third cooling section is relatively higher than that of the heat medium used as a cold heat source in the first cooling section, depending on the depth of sampling. There is a tendency.
Therefore, according to the above characteristic configuration, after the air to be supplied to the fuel means is cooled in the third cooling portion in which the temperature of the heat medium to be used is relatively high, the first cooling portion in which the temperature of the heat medium to be used is relatively low Since the cooling is performed in the cooling section, the air can be cooled without wasting the cold heat of each heat medium used in the two cooling sections as much as possible.
The temperature of the seawater used as a cold heat source in the third cooling section tends to be relatively high compared to the cold water from the refrigerator used as a cold heat source in the second cooling section, although it depends on the depth of sampling. .
Therefore, according to the above characteristic configuration, after the air supplied to the combustion means is cooled in the third cooling part in which the temperature of the heat medium to be used is relatively high, the second cooling part in which the temperature of the heat medium to be used is relatively low Since the cooling is performed in the cooling section, the air can be cooled without wasting the cold heat of each heat medium used in the two cooling sections as much as possible.

A further characteristic configuration of the mobile body according to the present invention is that the operating state of the cooling device is determined based on the power demand and the output characteristics of the gas turbine unit.

According to the above characteristic configuration, it is possible to operate the cooling device in an operation state suitable for power demand, and to prevent the cooling device from being overloaded more than necessary.

Further, a further characteristic configuration of the moving body according to the present invention is that the cooling device includes the first cooling unit and the third cooling unit,
While the air supplied to the combustion means is cooled by the first cooling part, the air supplied to the combustion means is cooled by the third cooling part based on the power demand and the output characteristics of the gas turbine unit. Determining the degree determines the operating state of the cooling device.

According to the above characteristic configuration, the degree of cooling of the air by the third cooling section is determined based on the power demand and the output characteristics of the gas turbine unit while the air is cooled by the first cooling section, and the cooling device is operated. state can be determined. Therefore, the operating state of the cooling device thus determined is an operating state in which the cold heat of the liquid fuel is effectively utilized.
In addition, in the above characteristic configuration, in a state in which the air supplied to the combustion means is cooled by the first cooling section, combustion is performed by the second cooling section and the third cooling section based on the power demand and the output characteristics of the gas turbine unit. Determining the operating state of the cooling device by determining the degree of cooling of the air supplied to the combustion means, determining the power demand and output characteristics of the gas turbine unit with the air supplied to the combustion means cooled by the first cooling section. and determining the degree of cooling of the air supplied to the combustion means by the second cooling unit, thereby determining the operating state of the cooling device, and cooling the air supplied to the combustion means by the first cooling unit and determining the operating state of the cooling device by determining the degree of cooling of the air supplied to the combustion means by the third cooling section based on the power demand and the output characteristics of the gas turbine unit in the state where .

A further characteristic configuration of the moving body according to the present invention is that the cooling device includes the first cooling section, the second cooling section, and the third cooling section.

According to the above characteristic configuration, the first cooling section that uses the heat medium used to vaporize the liquid fuel as the cold heat source, the second cooling section that uses the heat medium from the refrigerator as the cold heat source, and the seawater. The air supplied to the combustion means is cooled in the third cooling section, which is used as a cold heat source.

In this way, by cooling the air supplied to the combustion means in the first, second and third cooling units, for example, the cold heat obtained by vaporizing the liquid fuel consumed by the power generation system during power generation is For reasons such as shortage, only the cold heat of each heat medium used in any two cooling units out of the three cooling units can reduce the temperature of the air supplied to the combustion means and reduce the output decrease of the power generation system. Even if the temperature cannot be lowered to such a level, by providing three cooling units, the cold heat of each heat medium used in these three cooling units cools the air supplied to the combustion means. can be used to lower the temperature. This makes it possible to further suppress the decrease in output of the power generation system.

Further, according to a further characteristic configuration of the moving body according to the present invention, the cooling device is configured such that the air supplied to the combustion means flows through the third cooling section, the second cooling section, and the first cooling section in this order. Second, the first, second and third cooling units are arranged.

As described above, the seawater used as a cold heat source in the third cooling section has a temperature higher than that of the heat medium used as a cold heat source in the first cooling section and the second cooling section, depending on the depth of sampling. The temperature tends to be relatively high in the second cooling section, and the heat medium used as a cold heat source in the second cooling section tends to have a relatively high temperature compared to the heat medium used in the first cooling section. .
Therefore, according to the above characteristic configuration, the air supplied to the combustion means is cooled in order of the relative temperature of the heat medium to be used in the cooling section, that is, after cooling in the third cooling section, the second cooling section , and then in the first cooling section, the air can be cooled without wasting the cold heat of each heat medium used in the three cooling sections as much as possible.

A further characteristic configuration of the mobile body according to the present invention is that the operating state of the cooling device is determined based on the power demand and the output characteristics of the gas turbine unit.

According to the above characteristic configuration, it is possible to operate the cooling device in an operation state suitable for power demand, and to prevent the cooling device from being overloaded more than necessary.

Further, according to a further characteristic configuration of the moving body according to the present invention, the electric power demand and the output of the gas turbine unit are determined in a state in which the air supplied to the combustion means is cooled by the first cooling section and the third cooling section. The operating state of the cooling device is determined by determining the degree of cooling of the air supplied to the combustion means by the second cooling section based on the characteristics.

According to the characteristic configuration, the degree of cooling of the air by the second cooling unit is determined based on the power demand and the output characteristics of the gas turbine while the air is cooled by the first cooling unit and the third cooling unit, The operating state of the cooling system can be determined. Therefore, the operating state of the cooling device thus determined is an operating state in which the cold heat of the liquid fuel is effectively utilized.

Further, a further characteristic configuration of the mobile body according to the present invention is that it is any one of a ship, a floating structure, and a land transport.

According to the above characteristic configuration, the moving object is a ship further equipped with the heat recovery boiler unit, the steam turbine unit, and the second power generation means (in other words, a ship equipped with the combined cycle power generation system), and this movement In the physical ship, the heat of the exhaust gas from the gas turbine unit is used to rotationally drive the steam turbine, and the rotational force of the steam turbine also generates electricity in the second power generating means. Therefore, it is possible to effectively use the heat of the exhaust gas from the gas turbine unit to efficiently generate power.
Further, in the moving body according to the present invention, even if the area where the ship as the moving body is sailing or anchored is often a tropical region, the cooling device cools the air supplied to the combustion means. Since mist is not used as in , the effect of recovering the output of the power generation system can be obtained.

Further, a further characteristic configuration of the moving body according to the present invention is a first seawater channel through which the seawater supplied to the third cooling unit flows;
a second seawater channel through which the seawater supplied from the third cooling unit to the condensate cooling unit flows;
a bypass channel that connects the first seawater channel and the second seawater channel;
and adjusting means for adjusting the amount of the seawater flowing through the bypass channel.

When the temperature difference between the seawater supplied to the third cooling section and the outside air taken in to supply the combustion means is small, the air is cooled even if the amount of seawater supplied to the third cooling section is small. Although it is difficult to make a difference in the effect, even in such a case, always circulating the entire amount of seawater pumped up by the pump to the condensate cooling unit via the third cooling unit does not increase the pump output unnecessarily. Connect. Also, if the temperature of seawater is higher than the temperature of the outside air, the supply of seawater to the third cooling section may also heat the air.
According to the above characteristic configuration, a bypass channel connecting the first seawater channel and the second seawater channel is provided, and the amount of seawater flowing through the bypass channel is adjusted by the adjusting means, whereby the third cooling unit and the amount of seawater flowing to the condensate cooling section through the bypass channel without passing through the third cooling section.
Therefore, by adjusting the amount of seawater flowing through the bypass channel according to the amount of seawater required by the third cooling section, unnecessary increase in pump output can be suppressed. Also, when the temperature of the seawater is higher than the temperature of the outside air, the entire amount of the seawater pumped up by the pump is adjusted to flow through the bypass channel, and the seawater is not supplied to the third cooling section. , it is also possible to prevent a situation in which the air is heated.

Further, according to a further characteristic configuration of the moving body according to the present invention, the operating state of the cooling device is determined according to at least one of the state of the atmosphere and the state of the cooling device, and the first cooling unit and determining the degree of cooling of the air supplied to the combustion means by at least one of the second cooling section and the third cooling section.

According to the above characteristic configuration, it is possible to determine the degree of cooling of the air by each cooling unit after determining the operating state of the cooling device according to the state of the atmosphere. Therefore, for example, after determining that the operating state of the cooling device is a state in which air is not cooled by any one of the first to third cooling units, the degree of air cooling by the other cooling units is determined. A decision can be made to operate the chiller. The state of the atmosphere includes atmospheric temperature, atmospheric pressure, humidity, and the like, and the state of the cooling device includes the presence or absence of failure, the temperature of seawater to be used, the amount of liquid fuel (LNG) used, and the like.

Further, a further characteristic configuration of the moving body according to the present invention is that the vaporization section vaporizes the liquid fuel using the heat medium used in the first cooling section as a heat source .

Further, a moving body according to the present invention for achieving the above object is characterized in that a mixture of air and fuel gas obtained by vaporizing a liquid fuel is combusted by a combustion means to generate a combustion gas, and the combustion means Air is supplied to the combustion means, and is used in a power generation system comprising a gas turbine unit in which a gas turbine is rotationally driven by the combustion gas generated in and a first power generation means for generating power using the rotational force of the gas turbine. A moving body provided with a cooling device for cooling the
The cooling device includes a first cooling section that uses the heat medium used to vaporize the liquid fuel as a cold heat source, a second cooling section that uses the heat medium from the refrigerator as a cold heat source, and seawater as a heat medium. A third cooling unit that uses as a cold heat source,
The air supplied to the combustion means is cooled by the first cooling part and the third cooling part, and is supplied to the combustion means by the second cooling part based on the power demand and the output characteristics of the gas turbine unit. The operating state of the cooling device is determined by determining the degree of cooling of the air.

According to the above characteristic configuration, the first cooling unit uses the heat medium used to vaporize the liquid fuel as the cold heat source, the second cooling unit uses the heat medium from the refrigerator as the cold heat source, and seawater as the heat medium. The air supplied to the combustion means is cooled in at least two cooling sections of the third cooling section using as a cold heat source.
For example, when only the cold heat of cold water (cold heat source) from the refrigerator is used as in the past, there is a problem that the cold heat of the cold water from the refrigerator cannot sufficiently cool the air in many cases. Another problem is that if you try to produce chilled water that can sufficiently cool the air, the energy efficiency of the entire power generation system will decrease, and if you try to increase the amount of chilled water produced, the size of the refrigerator will be unavoidable. could not be avoided. However, in the above-described characteristic configuration, the air supplied to the combustion means is cooled in at least two cooling units, so compared to the case where only the cold heat of the cold heat source from the refrigerator is used. , the air supplied to the combustion means can be sufficiently cooled while suppressing the occurrence of the above problems, and the effect of recovering the output of the power generation system can be easily obtained.
In addition, since the present invention is a moving body equipped with the cooling device as described above, for example, by moving the moving body to a place where a combined cycle power generation system not equipped with a cooling device is installed, A cooling device can be attached to this combined cycle power generation system, thereby suppressing a decrease in the output of the gas turbine unit.
According to the characteristic configuration, the degree of cooling of the air by the second cooling unit is determined based on the power demand and the output characteristics of the gas turbine while the air is cooled by the first cooling unit and the third cooling unit, The operating state of the cooling system can be determined. Therefore, the operating state of the cooling device thus determined is an operating state in which the cold heat of the liquid fuel is effectively utilized.
According to the above characteristic configuration, it is possible to operate the cooling device in an operation state suitable for power demand, and to prevent the cooling device from being overloaded more than necessary.

A further characteristic configuration of the moving body according to the present invention is that the number of operating gas turbine units is determined based on the power demand and the operating state of the cooling device.

According to the characteristic configuration described above, it is possible to operate the number of gas turbine units corresponding to the electric power demand without unnecessarily increasing the number of operating gas turbine units.
The operating state of the cooling device varies depending on the degree of cooling of the air supplied to the combustion means in each of the first cooling section, second cooling section, and third cooling section. By changing, the operating state of the cooling device can be appropriately changed. Also, the degree of air cooling by each cooling unit can be changed by changing the temperature of the heat medium supplied to the cooling unit or by starting or stopping the supply of the heat medium to the cooling unit.
In addition, the power demand in the present application refers to the power required by a mobile object, the power required by one or more facilities to which power is supplied from the mobile object, and the amount of power generated by a power generation system for the purpose of storage of electricity. It is a concept that includes power to

Further, a moving body according to the present invention for achieving the above object is characterized in that a mixture of air and fuel gas obtained by vaporizing a liquid fuel is combusted by a combustion means to generate a combustion gas, and the combustion means Air is supplied to the combustion means, and is used in a power generation system comprising a gas turbine unit in which a gas turbine is rotationally driven by the combustion gas generated in and a first power generation means for generating power using the rotational force of the gas turbine. A moving body provided with a cooling device for cooling the
The cooling device includes a first cooling section that uses the heat medium used to vaporize the liquid fuel as a cold heat source, a second cooling section that uses the heat medium from the refrigerator as a cold heat source, and seawater as a heat medium. of the third cooling unit that uses as a cold heat source, the first cooling unit, and at least one of the second cooling unit and the third cooling unit,
The combustion by at least one of the second cooling section and the third cooling section based on the power demand and the output characteristics of the gas turbine unit in a state where the air supplied to the combustion means is cooled by the first cooling section. Determining the operating state of the cooling device by determining the degree of cooling of the air supplied to the means,
The point is that the number of operating gas turbine units is determined based on the power demand and the operating state of the cooling device.

According to the above characteristic configuration, the first cooling unit uses the heat medium used to vaporize the liquid fuel as the cold heat source, the second cooling unit uses the heat medium from the refrigerator as the cold heat source, and seawater as the heat medium. The air supplied to the combustion means is cooled in at least two cooling sections of the third cooling section using as a cold heat source.
For example, when only the cold heat of cold water (cold heat source) from the refrigerator is used as in the past, there is a problem that the cold heat of the cold water from the refrigerator cannot sufficiently cool the air in many cases. Another problem is that if you try to produce chilled water that can sufficiently cool the air, the energy efficiency of the entire power generation system will decrease, and if you try to increase the amount of chilled water produced, the size of the refrigerator will be unavoidable. could not be avoided. However, in the above-described characteristic configuration, the air supplied to the combustion means is cooled in at least two cooling units, so compared to the case where only the cold heat of the cold heat source from the refrigerator is used. , the air supplied to the combustion means can be sufficiently cooled while suppressing the occurrence of the above problems, and the effect of recovering the output of the power generation system can be easily obtained.
In addition, since the present invention is a moving body equipped with the cooling device as described above, for example, by moving the moving body to a place where a combined cycle power generation system not equipped with a cooling device is installed, A cooling device can be attached to this combined cycle power generation system, thereby suppressing a decrease in the output of the gas turbine unit.
According to the above characteristic configuration, in a state in which air is cooled by the first cooling section, air is cooled by at least one of the second cooling section and the third cooling section based on the power demand and the output characteristics of the gas turbine unit. The degree of cooling can be determined and the operating state of the cooling system can be determined. Therefore, the operating state of the cooling device thus determined is an operating state in which the cold heat of the liquid fuel is effectively utilized.
In addition, in the above characteristic configuration, in a state in which the air supplied to the combustion means is cooled by the first cooling section, combustion is performed by the second cooling section and the third cooling section based on the power demand and the output characteristics of the gas turbine unit. Determining the operating state of the cooling device by determining the degree of cooling of the air supplied to the combustion means, determining the power demand and output characteristics of the gas turbine unit with the air supplied to the combustion means cooled by the first cooling section. and determining the degree of cooling of the air supplied to the combustion means by the second cooling unit, thereby determining the operating state of the cooling device, and cooling the air supplied to the combustion means by the first cooling unit and determining the operating state of the cooling device by determining the degree of cooling of the air supplied to the combustion means by the third cooling section based on the power demand and the output characteristics of the gas turbine unit in the state where .
According to the above characteristic configuration, it is possible to operate the cooling device in an operation state suitable for power demand, and to prevent the cooling device from being overloaded more than necessary.
Further, according to the above characteristic configuration, it is possible to operate the number of gas turbine units corresponding to the electric power demand without unnecessarily increasing the number of operating gas turbine units.
The operating state of the cooling device varies depending on the degree of cooling of the air supplied to the combustion means in each of the first cooling section, second cooling section, and third cooling section. By changing, the operating state of the cooling device can be appropriately changed. Also, the degree of air cooling by each cooling unit can be changed by changing the temperature of the heat medium supplied to the cooling unit or by starting or stopping the supply of the heat medium to the cooling unit.
In addition, the power demand in the present application refers to the power required by a mobile object, the power required by one or more facilities to which power is supplied from the mobile object, and the amount of power generated by a power generation system for the purpose of storage of electricity. It is a concept that includes power to

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the electric power generation system mounted in the ship which concerns on 1st Embodiment. It is a figure which shows schematic structure of a refrigerator. It is a figure which shows schematic structure of the electric power generation system mounted in the ship which concerns on 2nd Embodiment. 4 is a graph showing output characteristics of a gas turbine unit; 4 is a graph showing efficiency characteristics of a gas turbine unit;

[First embodiment]
A moving body according to a first embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a case where the mobile body is a ship will be described as an example.

FIG. 1 is a diagram showing a schematic configuration of a power generation system E mounted on a ship (LNG ship). As shown in the figure, the power generation system E includes a fuel tank 1 storing liquefied natural gas (LNG) as a liquid fuel, and water as a heat medium to vaporize the LNG into fuel gas. Combustor 6 (combustion means) combusts a mixture of fuel gas and air in the combustor 2 (vaporization section) to generate combustion gas, and the combustion gas generated in the combustor 6 causes the gas turbine 7 to rotate. A gas turbine unit G to be driven, a refrigerator 10 that produces water as a cold heat source, a cooling device 20 that cools the air supplied to the combustor 6, and the heat of the exhaust gas discharged from the gas turbine unit G. The exhaust heat recovery boiler unit 25 that vaporizes water to produce steam, the steam turbine unit S that rotationally drives the steam turbine 30 by the steam vaporized by the exhaust gas from the gas turbine unit G, and the rotational force of the gas turbine 7 A first power generator 35 (first power generation means) that uses the power to generate power and a second power generator 36 (second power generation means) that uses the rotational force of the steam turbine 30 to generate power are provided.

The fuel tank 1 is connected to the other end of a fuel supply path L1, one end of which is connected to the combustor 6 in the gas turbine unit G, and the carburetor 2 is arranged in the fuel supply path L1. . The vaporizer 2 is a heat exchanger in which a vaporization medium supply line L2 through which water as a heat source flows is connected to a first cooling medium supply line L3 through which water obtained cold heat from LNG flows. The LNG supplied from the fuel tank 1 is heated and vaporized by the heat of the water supplied through the vaporizing medium supply path L2 in the vaporizer 2, and is supplied to the combustor 6 as fuel gas. .

The gas turbine unit G has a compressor 5 , a combustor 6 and a gas turbine 7 . The compressor 5 is driven to rotate by the gas turbine 7 , is supplied with air cooled by a cooling device 20 (described later) through the first air supply passage L 10 , compresses the supplied air, and sends it to the combustor 6 . It is configured. Further, the combustor 6 combusts a mixture of fuel gas supplied through the fuel supply path L1 and compressed air supplied from the compressor 5 through the second air supply path L11 to generate combustion. The gas is delivered to the gas turbine 7 through the combustion gas supply line L12. The gas turbine 7 is rotationally driven by combustion gas delivered from the combustor 6 , and rotational force is transmitted to the compressor 5 and the first generator 35 . Further, the combustion gas that has been used to rotate the gas turbine 7 is sent as exhaust gas to the exhaust heat recovery boiler unit 25 described later through the exhaust gas supply line L13.

The refrigerator 10 in this embodiment is a so-called absorption refrigerator, and includes an evaporator 11, an absorber 13, a regenerator 15 and a condenser 17, as shown in FIG.

The evaporator 11 has therein a second cooling medium supply path L4 through which water supplied as a cold heat source to a second cooling unit 22 of the cooling device 20 described later flows, and a second cooling medium supply path L4. A cooling medium recovery path L5 is connected and through which the water deprived of cold heat in the second cooling unit 22 is arranged, and the water stored in the evaporator 11 is pumped up by a pump (not shown). A first spraying means 12 for spraying into the evaporator 11 is provided. The evaporator 11 is in communication with the absorber 13 through a passage, and the insides of the evaporator 11 and the absorber 13 are decompressed by a vacuum pump (not shown). In the evaporator 11, the water sprayed by the first spraying means 12 is evaporated at a low temperature of about 5°C under reduced pressure to cool the water flowing through the cooling medium recovery path L5. In the second cooling section 22, cold water is produced which is used as a cold heat source. The low-temperature evaporated water (that is, water vapor) moves to the absorber 13 through the passage.

The absorber 13 stores an absorbing liquid (for example, an aqueous solution of lithium bromide, etc.) in its interior, and sprays a high-concentration absorbing liquid heated in a regenerator 15 described later into the absorber 13. A second spray means 14 is provided. In the absorber 13, the high-concentration absorbent sprayed by the second spray means 14 is cooled by the refrigerant, and the water vapor generated in the evaporator 11 is absorbed by the cooled absorbent.

The absorbent stored in the absorber 13 is pumped up by a pump (not shown) and supplied to the regenerator 15 , and the supplied absorbent is heated by the heating means 16 . It's becoming Note that the heating means 16 is not particularly limited as long as it can heat the absorbent, and for example, means utilizing combustion heat of fuel gas or heat from an electric heater can be exemplified. In the regenerator 15 , the absorbent supplied from the absorber 13 is heated to separate the water vapor absorbed by the absorbent in the absorber 13 . The separated water vapor moves to the condenser 17 communicating with the regenerator 15 through the passage.

In the condenser 17 , the water vapor separated by the regenerator 15 is cooled by the refrigerant, and the condensed water is supplied to the evaporator 11 . Cooling of the high-concentration absorbent in the absorber 13 and cooling of water vapor in the condenser 17 utilizes cold heat of a refrigerant (e.g., water) appropriately supplied from the outside to cool the absorber 13 and the condenser. Inside 17, a coolant channel La through which the coolant flows is passed.

The water as a source of cold heat produced in the evaporator 11 of the refrigerator 10 may be used only in the second cooling section 22, but it is not used for the air conditioner provided on the ship. Also good. That is, the flow paths branched from the second cooling medium supply path L4 and the cooling medium recovery path L5 connected to the evaporator 11 are appropriately connected to an air conditioner, and the second cooling medium supply path L4 serves as a cold heat source. In addition to supplying the water to the air conditioner, the water deprived of cold heat in the air conditioner may be recovered through the cooling medium recovery path L5.

The cooling device 20 is configured to cool air flowing through the first air supply path L10 (air supplied to the combustor 6). Specifically, in this embodiment, the cooling device 20 includes a first cooling unit 21 that uses water as a heat medium used to vaporize LNG as a cold heat source, and water produced by the refrigerator 10. It is provided with a second cooling section 22 that is used as a cold heat source and a third cooling section 23 that uses seawater as a heat medium as a cold heat source.

The first cooling unit 21 is a heat exchanger to which the vaporization medium supply path L2 and the first cooling medium supply path L3 are connected. It circulates through the vaporization medium supply path L2 and the first cooling medium supply path L3 therebetween. The first cooling unit 21 cools the air supplied to the combustor 6 by cold heat of water (that is, water obtained cold heat from LNG) supplied through the first cooling medium supply path L3.

The second cooling unit 22 is a heat exchanger to which the second cooling medium supply path L4 and the cooling medium recovery path L5 are connected. The coolant circulates with the portion 22 through the second cooling medium supply path L4 and the cooling medium recovery path L5. The second cooling unit 22 cools the air supplied to the combustor 6 by cold heat of water (that is, water produced in the refrigerator 10 and obtained cold heat) supplied through the second cooling medium supply path L4. do.

The third cooling unit 23 includes a first seawater supply channel L6 (first seawater channel) through which seawater pumped from the sea by the pump P1 flows, and a second seawater supply through which seawater is supplied to the condensate cooling unit 32 described later. It is a heat exchanger connected to the passage L7 (second seawater passage). The third cooling unit 23 cools the air supplied to the combustor 6 by cold heat of seawater as a cold heat source supplied through the first seawater supply passage L6. A bypass channel L8 connecting the first seawater supply channel L6 and the second seawater supply channel L7 is connected between the pump P1 and the third cooling unit 23 in the first seawater supply channel L6.

In addition, an adjusting device 24 (adjusting means) is provided at the connection point of the bypass flow path L8 in the first seawater supply path L6, and the adjusting device 24 adjusts the amount of seawater flowing through the bypass flow path L8. You can do it.

Furthermore, in the present embodiment, each of the cooling units 21, 22, and 23 is composed of the third cooling unit 23, the second cooling unit 22, and the first cooling unit 21 from the upstream side in the direction in which the air flowing to the combustor 6 flows. They are arranged in order, and the air sucked into the first air supply path L10 is cooled in the order of the third cooling section 23, the second cooling section 22, and the first cooling section 21. As shown in FIG.

The exhaust heat recovery boiler unit 25 is used to rotate the gas turbine 7 and is configured to recover the heat of the exhaust gas discharged from the gas turbine 7 . Specifically, in this embodiment, the heat recovery boiler unit 25 heats and vaporizes the water in the plurality of drums 26 with the heat of the exhaust gas from the gas turbine 7 to produce steam. This steam is then delivered to the steam turbine 30 of the steam turbine unit S through the steam supply line L14. Exhaust gas from which heat is recovered is appropriately discharged to the outside.

The steam turbine unit S has a steam turbine 30 , a condenser 31 and a condensate cooling section 32 . The steam turbine 30 is rotationally driven by steam delivered from the heat recovery boiler unit 25 , and rotational force is transmitted to the second generator 36 . Further, the condenser 31 has a condensate cooling section 32 disposed therein, and the steam supplied to rotationally drive the steam turbine 30 is returned to water within the condenser 31 to supply water. It is fed to drum 26 through path L15. The condensate cooling unit 32 is a heat exchanger in which the second seawater supply path L7 and the seawater discharge path L9 that discharges seawater to the sea are connected, and cools the seawater supplied through the second seawater supply path L7. The seawater cooled inside the condenser 31 is discharged to the sea through the seawater discharge path L9. In this embodiment, in the condensate cooling unit 32, when the temperature of the seawater supplied through the second seawater supply path L7 is about 32° C., the temperature of the seawater used for cooling in the condenser 31 is It becomes about 42°C.

The first generator 35 is driven by the gas turbine 7 to generate power, and the second generator 36 is driven by the steam turbine 30 to generate power.

In the moving object having the above configuration, the fuel gas vaporized in the vaporizer 2 is supplied to the combustor 6, and the air cooled in the cooling device 20 is supplied to the combustor 6. , a mixture of fuel gas and air is combusted, and the generated combustion gas is sent to the gas turbine 7, which drives the gas turbine 7 to rotate, and the rotational force drives the first generator 35. power generation.

In this moving body, the combustion gas supplied to rotate the gas turbine 7 is sent as exhaust gas to the exhaust heat recovery boiler unit 25, and steam is generated by utilizing the heat of the exhaust gas in the exhaust heat recovery boiler unit 25. This steam is produced and sent to the steam turbine 30 to rotate the steam turbine 30, and the rotational force drives the second generator 36 to generate power.

According to the ship equipped with the power generation system E according to the present embodiment, since the air supplied to the combustor 6 is cooled by the cooling device 20, the output of the power generation system E decreases (in other words, the power generation amount decreases). can be suppressed. Also, in the case where a plurality of gas turbine units G are installed on a ship, since the provision of the cooling device 20 can suppress a decrease in the output of the power generation system E, the gas turbine unit G required to obtain the same power It is possible to reduce the number of installed units, and it is possible to reduce equipment costs, maintenance costs, and installation space.

In addition, the cooling device 20 in the present embodiment is used as a cold heat source for cooling the air supplied to the combustor 6 by the heat medium that has taken cold heat from the LNG, which is inevitably generated when LNG is vaporized. Cold heat of LNG can be effectively utilized.

Furthermore, by cooling the air supplied to the combustor 6 in the three cooling units 21, 22, and 23, there is a problem that the energy efficiency of the power generation system E as a whole decreases and the size of the refrigerator 10 increases. is unavoidable, and the problem that the output of the power generation system E decreases due to the lack of cold heat obtained by vaporizing the LNG that the power generation system E consumes during power generation, etc., while solving the problem that the combustor By sufficiently cooling the air supplied to 6, the decrease in the output of the power generation system E can be suppressed.

Here, the water used as a cold heat source in the first cooling unit 21 is used for vaporizing LNG. In the present embodiment, as shown in FIG. 1, when the temperature of LNG is about −160° C., the water used in the first cooling unit 21 vaporizes the LNG into fuel gas at about 10° C. Water, which is a medium, obtains a considerable amount of cold heat, and if the temperature before obtaining cold heat is about 13°C, the temperature after obtaining cold heat is about 5°C.

On the other hand, the water used as a cold heat source in the second cooling unit 22 is produced by the refrigerator 10 and has a relatively high temperature compared to the water used in the first cooling unit 21. In this embodiment, as shown in FIG. 1, the temperature at the time of supply to the second cooling unit 22 is about 7 ° C., and after the cold heat is taken away by the air in the second cooling unit 22 The temperature at is about 15°C.

In addition, the seawater used as a cold heat source in the third cooling unit 23 is about 20 to 30°C if it is pumped from a depth of 30m to 70m, although it depends on the depth of sampling. As shown, the temperature is about 25° C. in the present embodiment, and the temperature after the cold heat is taken away by the air in the third cooling section 23 is about 32° C.

In the present embodiment, since the third cooling unit 23, the second cooling unit 22, and the first cooling unit 21 are arranged in this order from the upstream side in the direction of flow of air flowing to the combustor 6, the first air supply The air sucked into the path L10 (35° C. in this embodiment) is cooled in the order of the cooling units 21, 22, and 23 in which the temperature of the heat medium to be used is relatively high. By cooling in the second cooling section 22, the temperature reaches about 30°C, and then cooling in the second cooling section 22 reaches about 20°C. After that, the air supplied to the combustor 6 is cooled by Finally, the air can be cooled to about 15° C., and the air can be efficiently cooled without wasting the cold heat of each heat medium used in the three cooling units 21, 22, and 23 as much as possible.

In addition, in the present embodiment, a part of the seawater pipe for supplying seawater to the third cooling unit 23 and the condensate cooling unit 32 and recovering seawater from these cooling units 23 and 32 (that is, , the first seawater supply channel L6, the second seawater supply channel L7, and the seawater discharge channel L9) are shared, the arrangement of the pipes becomes simple, and the number of pumps P1 for circulating seawater is reduced. Only one unit is required.

Furthermore, in the present embodiment, a bypass channel L8 is provided that connects the first seawater supply channel L6 and the second seawater supply channel L7, and the amount of seawater flowing through this bypass channel L8 can be adjusted by the adjusting device 24. This has the following advantages.

For example, when the temperature difference between the air sucked into the first air supply path L10 and the seawater used in the third cooling unit 23 is small, air is supplied even if the amount of seawater supplied to the third cooling unit 23 is small. Although there is little difference in the cooling effect, circulating seawater to the condensate cooling section 32 via the third cooling section 23 even in such a case leads to an unnecessary increase in pump output. Also, if the temperature of the sucked air is higher than the temperature of the seawater, supplying the seawater to the third cooling unit 23 may rather heat the air.

However, in the mobile body according to the present embodiment, the unnecessary increase in the output of the pump P1 can be suppressed by adjusting the amount of seawater flowing through the bypass flow path L8 with the adjustment device 24 as necessary. . In addition, in the moving object according to the present embodiment, the adjustment device 24 adjusts the seawater pumped up by the pump P1 so that the entire amount of seawater flows through the bypass flow path L8 so that the temperature of the seawater is higher than the temperature of the air. Even in such a case, it is possible to prevent the seawater from heating the air.

[Second embodiment]
Next, a mobile body according to a second embodiment of the present invention will be described. Also in the present embodiment, the case where the moving body is a ship will be described as an example. Also, the same reference numerals are assigned to the same configurations as in the first embodiment, and detailed description thereof will be omitted.

FIG. 3 is a diagram showing a schematic configuration of a power generation system E1 mounted on a ship (LNG ship). As shown in the figure, the power generation system E1 includes a vaporizer 2, a plurality of gas turbine units Ga and Gb, a refrigerator 10, a plurality of cooling devices 20a and 20b, a plurality of heat recovery boiler units 25a, 25b and a steam turbine unit S. The power generation system E1 also includes a control device 40 and a temperature sensor Tb that detects the atmospheric temperature. Although not shown, the mobile power generation system E1 according to the second embodiment also includes a fuel tank in which liquefied natural gas is stored, and the torque of the gas turbines 7a and 7b of the gas turbine units Ga and Gb. and a second power generating means for generating power using the rotational force of the steam turbine 30 are provided. Note that FIG. 3 illustrates a configuration in which each of the plurality of gas turbine units, the plurality of cooling devices, and the plurality of heat recovery boiler units is provided with two each.

In the second embodiment, a fuel control valve V1 is provided between the fuel tank and the carburetor 2 in the fuel supply path L1. It is controlled by the control device 40 based on the state and the like.

In the second embodiment, the vaporization medium supply path L2 connected to the vaporizer 2 branches into vaporization medium supply paths L2a and L2b on the upstream side thereof, and the first cooling medium supply path L2a and L2b are also connected to the vaporizer 2. The cooling medium supply path L3 is branched into the first cooling medium supply paths L3a and L3b on its downstream side. A heat exchanger 37 and a buffer tank 38 are provided in order from the upstream side in the cooling medium supply path L3. The heat exchanger 37 is for heat exchange between the water obtained cold heat from the LNG in the vaporizer 2 and the seawater appropriately pumped up from the sea. It is for temporarily storing water to be supplied to the first cooling units 21a and 21b.

The two gas turbine units Ga and Gb have the same configuration as the gas turbine unit G in the first embodiment, and have compressors 5a and 5b and gas turbines 7a and 7b. That is, in this embodiment, air cooled by the cooling devices 20a and 20b is supplied to the compressors 5a and 5b through the first air supply paths L10a and L10b, respectively. The air supplied to the compressors 5a and 5b is mixed with fuel gas and burned in a combustor (not shown). Then, the combustion gas generated in the combustor is delivered to the gas turbines 7a and 7b, and after being used to rotate the gas turbines 7a and 7b, passes through the exhaust gas supply paths L13a and L13b as exhaust gas to the exhaust heat recovery boiler units 25a and 25a. 25b.

Further, in the second embodiment, the second cooling medium supply path L4 connected to the refrigerator 10 branches downstream of the refrigerator 10 into the second cooling medium supply paths L4a and L4b. A cooling medium recovery path L5 connected to the refrigerator 10 branches into cooling medium recovery paths L5a and L5b on the upstream side of the refrigerator 10 . Furthermore, in the second embodiment, a seawater temperature sensor Ta for measuring the temperature of seawater is provided in the refrigerant flow path La passing through the interiors of the absorber 13 and the condenser 17 of the refrigerator 10 .

Vaporizing medium supply paths L2a, L2b and first cooling medium supply paths L3a, L3b are connected to the first cooling units 21a, 21b of the cooling devices 20a, 20b in the second embodiment, respectively. Second cooling medium supply paths L4a and L4b and cooling medium recovery paths L5a and L5b are connected to the second cooling units 22a and 22b, respectively.

In addition, in the second embodiment, the first seawater supply path L6 is branched into the first seawater supply paths L6a and L6b on the downstream side of the pump P1, and the third cooling units 23a and 23a of the cooling devices 20a and 20b. The first seawater supply channels L6a and L6b are connected to 23b, and the seawater drainage channels L9a and L9b are connected to 23b. The supplied seawater is discharged into the sea through the seawater drainage channels L9a and L9b. Also in the cooling devices 20a, 20b, the respective cooling units 21a, 21b, 22a, 22b, 23a, 23b are arranged from the upstream side of the first air supply paths L10a, L10b to the third cooling units 23a, 23b, the second The cooling units 22a and 22b and the first cooling units 21a and 21b are arranged in this order.

The heat recovery boiler units 25a and 25b in the second embodiment vaporize the water in the drums 26a and 26b by the exhaust gases sent from the gas turbines 7a and 7b through the exhaust gas supply paths L13a and L13b, respectively, to produce steam. This steam is sent to the steam turbine 30 through the supply lines L14a and L14b.

In the second embodiment, the condensate cooling section 32 of the steam turbine unit S is connected to the second seawater supply line L7 branched from the first seawater supply line L6b, and is also connected to the seawater discharge line L9c. The seawater supplied through the secondary seawater supply channel L7 is discharged into the sea through the seawater discharge channel L9c. Also, the steam produced by the heat recovery boiler units 25a and 25b is returned to water in the condenser 31 and supplied to the drums 26a and 26b through the water supply paths L15a and L15b.

The control device 40 is a device responsible for various controls related to the operation of the power generation system E1. The controller 40 can determine the number of operating gas turbine units Ga, Gb based on the power demand and the operating conditions of the cooling devices 20a, 20b. The operating states of the cooling devices 20a and 20b can be determined in advance, or can be appropriately determined based on the power demand and the output characteristics of the gas turbine units Ga and Gb. Further, the output characteristics of the gas turbine units Ga and Gb are determined in advance according to the atmospheric temperature, atmospheric pressure, humidity, seawater temperature, and the like.

An example of operation control of the power generation system performed by the control device 40 will be described below with reference to FIG. 4 . In the following description, the operating conditions of the cooling devices 20a and 20b are such that the degree of air cooling by the first cooling units 21a and 21b and the third cooling units 23a and 23b is constant, and the second cooling unit He is trying to change by changing the cooling degree of the air by the parts 22a and 22b. FIG. 4 is a graph showing the output characteristics of the gas turbine unit determined in advance according to the atmospheric temperature. A dashed-dotted line X1 in the figure indicates the first output characteristic when one gas turbine unit is operated while the cooling device is operated so that the air supplied to the combustor is at 15°C. X2 represents the second output characteristic when the two gas turbine units are operated with the cooling device operated so that the air supplied to the combustor is 15°C. In addition, the two-dot chain line Y1 in the figure shows the third output characteristic when one gas turbine unit is operated while the cooling device is operated so that the air supplied to the combustor is at 10°C. , a two-dot chain line Y2 indicates the fourth output characteristic when two gas turbine units are operated with the cooling device operated so that the air supplied to the combustor is 10°C.

First, the control device 40 can meet the power demand of 49.2 MW at an atmospheric temperature of 20° C. in a predetermined operating state of the cooling devices 20a and 20b (operating state in which the air supplied to the combustor is 15° C.). The number of operating gas turbine units Ga and Gb is determined to be two, and the two gas turbine units Ga and Gb are operated (state of black circle (1) in FIG. 4).

Even if the atmospheric temperature rises from this state to 35° C., if the power demand is still 49.2 MW (the state of the black circle (2) in FIG. 4), this state is one point that indicates the first output characteristic. Since it is located between the dashed line X1 and the dashed line X2 indicating the second output characteristic, it is possible to cover the power demand without changing the operating state of the cooling devices 20a and 20b, and the two gas turbine units Ga , Gb are maintained in operation.

Then, when the power demand increases from this state and becomes a state of 82 MW or less (the state of the black circle (3) in FIG. 4), this state exceeds the dashed-dotted line X2 indicating the second output characteristic. not in position. Therefore, since it is possible to meet the electric power demand without changing the operation state of the cooling devices 20a and 20b, the two gas turbine units Ga and Gb are kept in operation.

On the other hand, if the power demand greatly exceeds 82 MW (the state of the white circle (3)′ in FIG. 4), this state corresponds to the dashed-dotted line X2 indicating the second output characteristic and the fourth output It is located at a position far beyond the two-dot chain line Y2 that indicates the characteristic. Therefore, even if the operating state of the cooling devices 20a and 20b is changed to an operating state in which the air supplied to the combustor is at 10° C., the electric power demand cannot be met. Operate and respond.

After that, when the atmospheric temperature drops to 27° C. and the power demand drops to 42.6 MW (state of black circle (4) in FIG. 4), this state is one point indicating the first output characteristic. Although it exceeds the chain line X1, it is located on the chain double-dashed line Y1 indicating the third output characteristic. Therefore, by changing the operating state of the cooling devices 20a and 20b to an operating state in which the air supplied to the combustor is at 10° C., the number of operating gas turbine units can be reduced to one to meet the power demand. . Therefore, in the second embodiment, the temperature of cold water supplied from the refrigerator 10 to the second cooling unit is lowered (that is, the degree of air cooling by the second cooling unit is increased), and the cooling devices 20a and 20b The operating state is changed to one in which the temperature of the air supplied to the combustor is 10° C., and one of the two gas turbine units Ga and Gb in operation is stopped.

As described above, in the moving object according to the second embodiment, the operating states of the cooling devices 20a and 20b and the number of operating gas turbine units Ga and Gb can be determined according to the power demand. It is possible to operate the cooling device in an appropriate operating state, and to operate the number of gas turbine units corresponding to the electric power demand without unnecessarily increasing the number of operating gas turbine units.

In addition, the control device 40 controls the flow rate of the LNG to rapidly increase and the inherent heat of the water supplied to the vaporizer 2 to decrease rapidly when the gas turbine units Ga and Gb start rapidly and when the gas turbines 7a and 7b stop tripping. Even when the cooling medium supply path L3 is operated, the buffer tank 38 provided in the cooling medium supply path L3 retains a sufficient amount of water, and control is performed so that the water can be quickly supplied. As a result, it is possible to prevent the vaporizer 2 from being damaged due to freezing due to insufficient heat quantity.

[Another embodiment]
[1] In each of the above embodiments, the cooling devices 20, 20a, 20b include the first cooling units 21, 21a, 21b, the second cooling units 22, 22a, 22b, and the third cooling units 23, 23a, 23b. However, a configuration in which the cooling device includes at least two of the three cooling units may be adopted.

When a configuration including the first cooling units 21, 21a, 21b and the second cooling units 22, 22a, 22b is adopted, the cold energy of LNG is effectively used, and the energy efficiency of the entire power generation system is reduced. After solving the problem of unavoidable enlargement of the refrigerator, the air supplied to the combustor 6 is cooled by the first cooling units 21, 21a, 21b and the second cooling units 22, 22a, 22b. Therefore, similarly to the above, a decrease in the output of the power generation systems E and E1 can be suppressed.
In this case, from the viewpoint of cooling the air without wasting the cold heat of the heat medium as much as possible, the air supplied to the combustor 6 is the second cooling section 22, 22a, 22b, the first cooling section It is preferable to arrange these two cooling portions 21, 21a, 21b, 22, 22a, 22b so as to flow in order of 21, 21a, 21b.

In addition, even when a configuration including the first cooling units 21, 21a, 21b and the third cooling units 23, 23a, 23b is adopted, the cold heat of LNG is effectively used, and the energy efficiency of the entire power generation system is reduced. After suppressing the problem of unavoidable size increase of the refrigerator, the air supplied to the combustor 6 is changed to the first cooling units 21, 21a, 21b and the third cooling units 23, 23a, 23b. Therefore, similarly to the above, a decrease in the output of the power generation systems E and E1 can be suppressed.
In this case, the two cooling portions 21, 21a, 21b are arranged so that the air supplied to the combustor 6 flows through the third cooling portions 23, 23a, 23b and the first cooling portions 21, 21a, 21b in this order. It is preferable to arrange 21b, 23, 23a, 23b. By doing so, the air can be cooled without wasting the cold heat of the heat medium as much as possible.

In addition, when a configuration including the second cooling units 22, 22a, 22b and the third cooling units 23, 23a, 23b is adopted, there is a problem that the energy efficiency of the power generation system as a whole decreases and the size of the refrigerator increases. is unavoidable, and the air supplied to the combustor 6 can be cooled by the second cooling units 22, 22a, 22b and the third cooling units 23, 23a, 23b. Similarly to , a decrease in the output of the power generation system E can be suppressed.
In this case, these two cooling portions 22, 22a, 22b are arranged such that the air supplied to the combustor 6 flows through the third cooling portions 23, 23a, 23b and the second cooling portions 22, 22a, 22b in this order. It is preferable to arrange 22b, 23, 23a, 23b. By doing so, the air can be cooled without wasting the cold heat of the heat medium as much as possible.

[2] In the above embodiment, the first cooling units 21, 21a, 21b, the second cooling units 22, 22a, 22b, and the third cooling units 23, 23a, 23b constituting the cooling devices 20, 20a, 20b The third cooling units 23, 23a, 23b, the second cooling units 22, 22a, 22b, and the first cooling units 21, 21a, 21b are arranged in this order from the upstream side in the direction of air flow to the container 6. , and the arrangement of these cooling units can be set as appropriate.

[3] In the above embodiment, the moving body is a ship equipped with the fuel tank 1, the vaporizer 2, the gas turbine unit G, the heat recovery boiler unit 25, the steam turbine unit S, and the generators 35 and 36. Although the case was exemplified, it is not limited to this. It may be a mobile body equipped with a first generator).
In the case of a mobile body equipped with a cooling device, for example, by moving the mobile body to a facility or the like equipped with a combined cycle power generation system that is not equipped with a cooling device, the cooling device provided by the mobile body can be used in this power generation system. It becomes possible to cool the air supplied to the combustor, thereby suppressing the reduction in the output of the gas turbine unit.
Moreover, if a cooling device and a configuration necessary for gas turbine power generation are mounted, it can be applied to a relatively small moving body and put into practical use.
In addition to LNG ships, moving bodies include, but are not limited to, LPG ships, ethylene ships, ammonia ships, liquefied hydrogen carriers, large tuna ships, refrigerated container ships, and floating ships. It also includes floating structures that are built or modified and towed to the site of use and moored for a trial period or almost permanently, and other land transportation vehicles (trucks, dollies).

[4] In the first embodiment, part of the seawater pipe for supplying seawater to the third cooling unit 23 and the condensate cooling unit 32 and recovering seawater from these cooling units 23 and 32 (That is, the first seawater supply channel L6, the second seawater supply channel L7, and the seawater discharge channel L9) are shared, and in the condensate cooling unit 32, the seawater used in the third cooling unit 23 is used as a cold heat source. However, it is not limited to this. For example, a pipe for supplying seawater to and recovering seawater from the third cooling unit 23 and a pipe for supplying and recovering seawater to the condensate cooling unit 32 are provided respectively, The condensate cooling unit 32 may use seawater supplied from a pipe different from the seawater used in the unit 23 .

[5] In the first embodiment, the bypass channel L8 connecting the first seawater supply channel L6 and the second seawater supply channel L7 is provided, and an adjustment device for adjusting the amount of seawater flowing through the bypass channel L8. 24, the configuration is not limited to this, and if necessary, the configuration may be configured without the bypass channel and the adjustment device.
In addition, in the above-described second embodiment, the aspect of adjusting the amount of seawater flowing through the second seawater supply path L7 is not adopted. You may make it adjust the quantity of the seawater distribute|circulating to the seawater supply path L7.

[6] In each of the above embodiments, water is used as the heat medium used in the vaporizer 2 and the first cooling units 21, 21a, and 21b. Also good. If the antifreeze solution is used, the LNG is vaporized into fuel gas by heat exchange with the antifreeze solution in the vaporizer 2, so that the temperature of the antifreeze solution is lower than that of water (for example, to 0°C). By using the antifreeze obtained from the LNG in the first cooling unit 21 to cool the air supplied to the combustor 6, the air can be cooled to about 10°C, for example.

[7] In each of the above-described embodiments, a so-called absorption chiller is used as the chiller 10, but it is not limited to this, and an electric turbo chiller may be adopted.

[8] In each of the above-described embodiments, the cold energy of the refrigerant supplied from the outside is utilized for cooling the high-concentration absorbent in the absorber 13 of the refrigerator 10 and for cooling water vapor in the condenser 17. However, it is not limited to this. For example, if the refrigerant channel La is branched from the first seawater supply channels L6 and L6a, flows through the absorber 13 and the condenser 17, and is connected to the second seawater supply channel L7, seawater Since a part of the piping can be shared not only for the third cooling units 23, 23a, 23b and the condensate cooling unit 32 but also for the seawater flow path to be supplied to the absorber 13 and the condenser 17 of the refrigerator, the piping can be more simplified. Further, when an electric turbo refrigerator is adopted as the refrigerator 10, the flow path of the cooling water used in the condenser of the electric turbo refrigerator is branched from the first seawater supply paths L6 and L6a, If it is provided so as to flow through the condenser and connect to the second seawater supply line L7, a part of the seawater pipe can be shared in the same manner as described above, and the arrangement of the pipes can be further simplified. It should be noted that the piping through which seawater flows is preferably made of stainless steel or titanium in consideration of the occurrence of rust.

[9] In each of the above embodiments, seawater used as a source of cold heat is pumped up from a depth of 30m to 70m as an example, but the present invention is not limited to this. For example, deep seawater can be used as a cold heat source.

[10] Although FIG. 1 does not show a configuration corresponding to the heat exchanger 37 and the buffer tank 38 in the second embodiment, the power generation system E mounted on the ship according to the first embodiment also includes: A heat exchanger and a buffer tank are preferably provided in the first cooling medium supply path L3.

[11] In the second embodiment, the steam produced by the plurality of heat recovery boiler units 25a and 25b is sent to the common steam turbine 30, but this is not the only option. A turbine unit S may be provided.

[12] In the second embodiment, the output characteristics of the gas turbine units Ga and Gb for determining the operating conditions of the cooling devices 20a and 20b are predetermined according to the atmospheric temperature. You may use the thing predetermined according to atmospheric pressure, humidity, and seawater temperature.

[13] In the above-described second embodiment, the gas turbine units Ga and Gb are controlled so as to be able to cover a predetermined electric power demand under a predetermined atmospheric temperature in a predetermined operating state of the cooling devices 20a and 20b. After determining the number of operating gas turbine units Ga and Gb, the operating states of the cooling devices 20a and 20b and the operating number of the gas turbine units Ga and Gb are appropriately adjusted according to changes in power demand and atmospheric temperature. Although the embodiment is changed, it is not limited to this.
First, the operating conditions of the cooling devices 20a and 20b are determined based on the power demand and the output characteristics of the gas turbine units Ga and Gb. After determining the number of units to be operated, the gas turbine units Ga and Gb may be operated.
Also, if changes in air temperature and power demand in a day are known in advance, the cooling devices 20a and 20b can be operated in advance according to the highest atmospheric temperature and the highest power demand. The state and the number of operating gas turbine units Ga and Gb may be determined.

[14] In the second embodiment, as a case of changing the operation state of the cooling devices 20a and 20b, a case of lowering the temperature of cold water supplied from the refrigerator 10 to the second cooling unit (that is, the second cooling unit 22a , 22b), but the present invention is not limited to this.
The operating state of the cooling devices 20a and 20b is to change the degree of air cooling by at least one of the first cooling units 21a and 21b, the second cooling units 22a and 22b, and the third cooling units 23a and 23b. can be changed with
For example, there are cases where the seawater temperature measured by the seawater temperature sensor Ta is high and the cooling of the air by the third cooling units 23a and 23b is considered ineffective. In this case, the regulating valves appropriately provided in the first seawater supply passages L6a and L6b are closed, and the operating states of the cooling devices 20a and 20b are controlled by the three cooling units 21a, 21b, 22a, 22b, 23a and 23b. , the air is cooled by the first cooling units 21a, 21b and the second cooling units 22a, 22b, and the air is not cooled by the third cooling units 23a, 23b (in other words, the first cooling It is also possible to change to an operating state in which the degree of air cooling by the third cooling units 23a and 23b is lowered without changing the degree of air cooling by the units 21a and 21b and the second cooling units 22a and 22b.

[15] In the above-described second embodiment, based on the power demand and the output characteristics of the gas turbine unit, the air Although the operating state of the cooling devices 20a and 20b is determined by determining the degree of cooling, the present invention is not limited to this.
The operating conditions of the cooling devices 20a and 20b are determined according to the state of the atmosphere (atmospheric temperature, atmospheric pressure, humidity, etc.), and the first cooling units 21a and 21b, the second cooling units 22a and 22b, and the third cooling units 23a, 23b may determine the degree of cooling of the air.
For example, when the atmospheric temperature is low (approximately 20 to 30° C.), the operating state of the cooling devices 20a and 20b is determined to operate with a cooling capacity that can cool the low-temperature air to a predetermined temperature, The degree of air cooling by each of the cooling units 21a, 21b, 22a, 22b, 23a, and 23b may be determined so as to achieve such an operating state.

[16] In the second embodiment, the output characteristics of the gas turbine units Ga and Gb are taken into consideration when determining the operating conditions of the cooling devices 20a and 20b and the number of operating gas turbine units Ga and Gb. The operation of the power generation system may be controlled in consideration of the efficiency characteristics of the gas turbine units Ga and Gb. An example of power generation system operation control in consideration of the efficiency characteristics of the gas turbine units Ga and Gb will be described with reference to FIG.
FIG. 5 is a graph showing efficiency characteristics of the gas turbine unit. %, and the one-dot chain line Z2 is the load factor when the cooling device is operated so that the air supplied to the combustor is 15 ° C. The efficiency characteristic (second efficiency characteristic) per gas turbine unit in the case of 100% is shown. The efficiency characteristic (third efficiency characteristic) per gas turbine unit when the load factor is 100% is shown.
At an atmospheric temperature of 20°C, the cooling device is operated at a load factor of 60% so that the air supplied to the combustor is 15°C, and two gas turbine units are operated (black circle (1) in FIG. 5). state) to a state in which the atmospheric temperature rises to 35°C without changing the number of operating gas turbine units and the degree of cooling of the air (state indicated by a black circle (2) in Fig. 5). Efficiency decreases. From this state (the state of the black circle (2) in FIG. 5), the gas turbine output and the cooling device are operated at a load factor of 100% so that the air supplied to the combustor is 15° C. (the state of (3)), the efficiency per gas turbine unit can be improved. After that, when the atmospheric temperature decreased to 27°C and the power demand also decreased, the efficiency per gas turbine unit decreased (state indicated by black circles (4) in Fig. 5). On the condition that the power demand can be covered, the cooling device is operated so that the air supplied to the combustor is 10°C by means such as lowering the temperature of the chilled water supplied from the refrigerator, and the gas turbine unit is operated. The number of units in operation is reduced to one (the state indicated by the black circle (5) in FIG. 5). By doing so, the efficiency per gas turbine unit is slightly lowered from the point of view of increasing the cooling capacity of the cooling device, but by reducing the number of operating gas turbine units to one, the gas turbine unit Efficiency per unit will eventually improve.
In this way, by controlling the operation of the power generation system in consideration of the efficiency characteristics of the gas turbine unit, the gas turbine unit can be efficiently operated.

[17] The configurations disclosed in the above embodiments (including other embodiments) can be applied in combination with configurations disclosed in other embodiments unless there is a contradiction. The embodiments disclosed in the document are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be applied to a moving object equipped with a cooling device capable of efficiently cooling air supplied to combustion means and suppressing a decrease in the output of a gas turbine unit.

1 fuel tank 2 vaporizer (vaporization part)
6 combustor (combustion means)
7, 7a, 7b gas turbine 10 refrigerator 20, 20a, 20b cooling device 21, 21a, 21b first cooling section 22, 22a, 22b second cooling section 23, 23a, 23b third cooling section 24 adjusting device (adjusting means )
25, 25a, 25b Exhaust heat recovery boiler unit 30 Steam turbine 31 Condenser 32 Condensate cooling unit 35 First generator (first power generation means)
36 second generator (second power generation means)
L6, L6a, L6b First seawater supply channel (first seawater channel)
L7 Second seawater supply channel (second seawater channel)
L8 bypass flow path G, Ga, Gb gas turbine unit S steam turbine unit E, E1 power generation system

Claims (15)

a gas turbine unit in which a mixture of air and fuel gas obtained by vaporizing a liquid fuel is combusted by a combustion means to generate combustion gas, and a gas turbine is rotationally driven by the combustion gas generated by the combustion means; and the gas turbine. A cooling device used in a power generation system comprising a first power generation means for generating power by utilizing the rotational force of a cooling device for cooling air supplied to the combustion means,
The cooling device includes a first cooling section that uses the heat medium used to vaporize the liquid fuel as a cold heat source, a second cooling section that uses the heat medium from the refrigerator as a cold heat source, and seawater as a heat medium. Of the third cooling units that use as a cold heat source, at least the first cooling unit and the third cooling unit, or the second cooling unit and the third cooling unit ,
a fuel tank storing the liquid fuel;
a vaporization unit that vaporizes the liquid fuel;
the gas turbine unit;
the first power generation means;
a waste heat recovery boiler unit for vaporizing water by exhaust gas from the gas turbine unit;
a steam turbine unit in which the steam turbine is rotationally driven by the steam vaporized in the heat recovery boiler unit;
a second power generation means for generating power using the rotational force of the steam turbine;
The steam turbine unit includes a condenser that recovers steam used to drive the rotation of the steam turbine as condensed water, and the seawater used in the third cooling section as a cold heat source. and a condensate cooling unit that cools the The cooling device is arranged so that the air supplied to the combustion means flows through the third cooling section and the first cooling section in this order , or through the third cooling section and the second cooling section in this order. 2. The moving body according to claim 1 , wherein the first and third cooling units or the second and third cooling units are arranged. 3. The mobile body according to claim 1, wherein the operating state of said cooling device is determined based on power demand and output characteristics of said gas turbine unit. The cooling device includes the first cooling unit and the third cooling unit,
While the air supplied to the combustion means is cooled by the first cooling part, the third cooling part cools the air supplied to the combustion means based on the power demand and the output characteristics of the gas turbine unit. 4. The moving body according to claim 3, wherein the operating state of the cooling device is determined by determining the degree. The moving body according to claim 1, wherein the cooling device includes the first cooling section, the second cooling section, and the third cooling section. In the cooling device, the first, second, and third cooling units are arranged such that the air supplied to the combustion means flows through the third cooling unit, the second cooling unit, and the first cooling unit in this order. 6. The mobile body according to claim 5 . 7. The mobile body according to claim 5, wherein the operating state of said cooling device is determined based on power demand and output characteristics of said gas turbine unit. The combustion means by the second cooling part based on the power demand and the output characteristics of the gas turbine unit in a state where the air supplied to the combustion means is cooled by the first cooling part and the third cooling part 8. The moving body according to claim 7, wherein the operating state of the cooling device is determined by determining the degree of cooling of the air supplied to. 9. The moving body according to any one of claims 1 to 8, which is a ship , a floating structure, or a land transport . a first seawater channel through which the seawater supplied to the third cooling unit flows;
a second seawater channel through which the seawater supplied from the third cooling unit to the condensate cooling unit flows;
a bypass channel that connects the first seawater channel and the second seawater channel;
The moving body according to any one of claims 1 to 9, further comprising adjusting means for adjusting the amount of said seawater flowing through said bypass channel. determining the operating state of the cooling device according to at least one of atmospheric conditions and conditions of the cooling device, and selecting one of the first cooling section, the second cooling section and the third cooling section; The moving body according to any one of claims 1 to 10, wherein the degree of cooling of the air supplied to the combustion means is determined by at least one of them. The moving body according to any one of claims 1 to 11, wherein the vaporization section utilizes the heat medium used in the first cooling section as a heat source to vaporize the liquid fuel. a gas turbine unit in which a mixture of air and fuel gas obtained by vaporizing a liquid fuel is combusted by a combustion means to generate combustion gas, and a gas turbine is rotationally driven by the combustion gas generated by the combustion means; and the gas turbine. A cooling device used in a power generation system comprising a first power generation means for generating power by utilizing the rotational force of a cooling device for cooling air supplied to the combustion means,
The cooling device includes a first cooling section that uses the heat medium used to vaporize the liquid fuel as a cold heat source, a second cooling section that uses the heat medium from the refrigerator as a cold heat source, and seawater as a heat medium. A third cooling unit that uses as a cold heat source ,
In a state where the air supplied to the combustion means is cooled by the first cooling part and the third cooling part, the second cooling part cools the combustion means by the second cooling part based on the power demand and the output characteristics of the gas turbine unit. A moving object that determines the operating state of the cooling device by determining the degree of cooling of the supplied air. The moving body according to any one of claims 1 to 13, wherein the number of operating gas turbine units is determined based on the power demand and the operating state of the cooling device. a gas turbine unit in which a mixture of air and fuel gas obtained by vaporizing a liquid fuel is combusted by a combustion means to generate combustion gas, and a gas turbine is rotationally driven by the combustion gas generated by the combustion means; and the gas turbine. A cooling device used in a power generation system comprising a first power generation means for generating power by utilizing the rotational force of a cooling device for cooling air supplied to the combustion means,
The cooling device includes a first cooling section that uses the heat medium used to vaporize the liquid fuel as a cold heat source, a second cooling section that uses the heat medium from the refrigerator as a cold heat source, and seawater as a heat medium. of the third cooling unit that uses as a cold heat source, the first cooling unit, and at least one of the second cooling unit and the third cooling unit,
The combustion by at least one of the second cooling section and the third cooling section based on the power demand and the output characteristics of the gas turbine unit in a state where the air supplied to the combustion means is cooled by the first cooling section. Determining the operating state of the cooling device by determining the degree of cooling of the air supplied to the means,
A moving body that determines the number of operating gas turbine units based on the power demand and the operating state of the cooling device.

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