JPH08291719A - Vaporization device for liquefied gas fuel for gas turbine - Google Patents

Abstract

PURPOSE: To vaporize and heat liquefied gas fuel for a gas turbine, such as LPG(liquefied petroleum gas) with a device requiring a small space and a low cost. CONSTITUTION: In a vaporization device for liquefied gas fuel for a gas turbine, the liquefied gas fuel is vaporized, heated and supplied to a gas turbine 4. Air having cooled a rotor is passed to a vaporizer 1 and a superheater 2 through an air piping 10 as heating medium. The liquefied gas fuel is vaporized and heated with the vaporizer 1 and the superheater 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for vaporizing liquefied gas fuel of a gas turbine such as LPG (liquefied petroleum gas).

[0002]

2. Description of the Related Art In a gas turbine using LPG as a fuel, an LPG vaporizer within a range shown by a dotted line in FIG. 2 has been conventionally used. That is, in this LPG vaporizer, the LPG fuel supplied by the supply pump 8 is vaporized by the vaporizer 1 to which low-pressure steam is supplied, and further heated by the super heater 2 to which low-pressure steam is supplied.
It is supplied to the combustor 5 of the gas turbine 4.

Reference numeral 7 is a supply pump 8 and a vaporizer 1.
, 6 is a knockout drum provided between the super heater 2 and the combustor 5,
Reference numeral 9 is a condensate drain pot connected to the vaporizer 1 and the super heater 2, and 3 is a rotor cooling air cooler having a plurality of air cooling fans for cooling the rotor cooling air of the circulating gas turbine.

[0004]

In the above-mentioned conventional LPG fuel vaporizer for a gas turbine, a single vaporizer and a low-pressure steam line as a heat source are required to vaporize the LPG fuel, which is wide. Requires space and high cost.

The present invention is intended to provide a liquefied gas device for a gas turbine which can solve the above problems.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a liquefied gas fuel vaporizer for a gas turbine, which vaporizes and heats the liquefied gas fuel and supplies it to a gas turbine. It is characterized in that it is used as a heating medium for heating.

[0007]

According to the present invention, the liquefied gas fuel is vaporized and heated by using the air, which has cooled the rotor of the gas turbine, as the heat medium, so that it is possible to eliminate a single vaporizer, and
The power of the cooling water for cooling the air that has cooled the rotor and the power of the air-cooling fan are reduced, and therefore the space and cost can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. In this embodiment, L of the conventional gas turbine shown in FIG. 2 is used.
In the vaporizer for PG fuel, the vaporizer 1 and the super heater 2 are configured as follows, and there is no difference in other parts.
The same parts as those in are denoted by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the rotor cooling air cooler 3 for cooling the circulating rotor cooling air of the gas turbine is used.
An air pipe 10 for connecting the outlet side pipe 3a and the inlet side pipe 3b is provided, and the air pipe 10 is the inlet side pipe 3b.
The rotor cooling air that has further cooled and raised the temperature of the rotor is passed through the super heater 2 and then the vaporizer 1 as a heat medium, and then to the outlet side pipe 3a. 11 and 12 are super heaters 2 of the air pipe 10.
Of the vaporizer 1 and the downstream side of the vaporizer 1.

Since this embodiment has the above-mentioned structure, the LPG fuel supplied to the vaporizer 1 is heated by a part of the rotor cooling air in the vaporizer 1 to be vaporized, and further the super heater 2 is used. Is heated with rotor cooling air and is then fed to the combustor 5 of the gas turbine 4.

As described above, since the LPG fuel is vaporized and heated by the rotor cooling air, no separate LPG fuel vaporizer is required, and the cooling water of the rotor cooling air and the power of the air cooling fan are reduced. To be done. Therefore, it is possible to reduce the space and cost.

In the present embodiment, when the gas turbine is started, the gas turbine 4 is started by the alternative fuel (natural gas, light oil, etc.) of another system until the gas turbine 4 reaches the load operation, and the gas turbine enters the load operation. After that, switching to LPG fuel is performed.

In the above embodiment, the LPG fuel is vaporized and heated, but the present invention is liquefied natural gas (LNG).
It can be used when vaporizing and heating the liquefied gas fuel of other gas turbines such as.

[0014]

As described above, according to the present invention, the air in which the rotor of the gas turbine is cooled is used as the heat medium for vaporizing and heating the liquefied gas fuel of the gas turbine.
The liquefied gas fuel vaporizer can be simplified and the cooling water for the air that cools the rotor and the power of the air cooling fan can be reduced, and the space and cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional gas turbine LPG fuel vaporizer.

[Explanation of symbols]

 1 vaporizer 2 super heater 3 rotor cooling air cooler 3a outlet side piping 3b inlet side piping 3c air cooling fan 4 gas turbine 5 combustor 6 knockout drum 7 accumulator 8 supply pump 9 condensate drain pot 10 air piping 11, 12 valves

Claims (1)

[Claims] 1. In a liquefied gas fuel vaporizer for a gas turbine, which vaporizes and heats the liquefied gas fuel and supplies it to a gas turbine, the use of air cooled in a rotor as a heat medium for vaporizing and heating the liquefied gas fuel. A liquefied gas fuel vaporizer for a gas turbine.