JPS595834A - Gas turbine plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for revaporizing gas in a gas turbine apparatus using low temperature fuel such as liquefied natural gas.

The maximum output and thermal efficiency of a gas turbine are affected by the air temperature at the compressor inlet, and as this temperature increases, the maximum output and thermal efficiency decrease. Therefore, in conventional gas turbine devices that suck atmospheric air directly into the compressor, there is a problem in that the maximum output decreases when the atmospheric temperature is high, such as in summer.

One possible solution to the above problem is to reduce the temperature of the air flowing into the compressor by utilizing the cold heat generated during revaporization of liquefied natural gas used as fuel for a gas turbine.

The present invention relates to a gas turbine plant having a method of revaporizing liquefied fuel using compressor suction air.The present invention relates to a gas turbine plant having a method of revaporizing liquefied fuel using compressor suction air. The purpose of this is to control the temperature of the heating fluid (mixed gas of air and waste gas, hereinafter referred to as waste gas mixed air) flowing into the heating side to within the total limit value.

The object of the invention is to prevent the compressor inlet air temperature from becoming too low, causing moisture in the air to freeze inside the compressor and damage the equipment. Furthermore, when the atmospheric temperature drops to below freezing, such as in winter, the vaporization capacity of the revaporizer decreases, so by limiting the temperature of the waste gas mixture air to a predetermined temperature or higher, the TJ - of the revaporizer can be made smaller. It is to do so.

Furthermore, since the waste gas mixture air has a lower oxygen content than normal air, it has the effect of reducing nitrogen compounds generated during combustion, thereby protecting the environment.

Hereinafter, all embodiments of the present invention will be explained in detail.

FIG. 1 shows a system of a gas turbine plant according to the present invention.

Air 6 entering compressor 7 is compressed and enters combustor 9 . 4 is fuel. The combustion gas 10 is passed through a gas turbine 11
12 indicates waste gas, and 13 indicates a load such as a generator. The waste gas 12 is the waste gas from the waste heat recovery boiler 14 and all the passages 16 are the waste gas.

When the temperature of the air 6 flowing into the compressor increases in summer or the like, the maximum output of the gas turbine decreases, so in order to reduce this, it is effective to lower the temperature of the air 6 using the cold heat of the fuel. The revaporizer 3 is for this purpose, whereby the cold fuel 2 from the liquefied gas tank 1 is heated and vaporized by the incoming air 51 . Incoming air 5
1 and 2, the cold heat of the feedstock 2 turns into low-temperature air 6, which flows into the compressor 7, thus making it possible to suppress a decrease in the maximum output of the gas turbine.

5 indicates the atmospheric condition. When the temperature of the atmosphere 5 is high, such as in the summer, the temperature of the compressor inlet air 6 will not drop significantly even if the air is introduced directly into the revaporizer 3, but when the temperature of the atmosphere 5 is low, such as in the winter, the compressor The temperature of the machine inlet air 6 reaches below freezing, and there is a danger that icing will occur inside the compressor 7 and damage the lumber machine.

Furthermore, in the revaporization device 3, if low-temperature air is directly used as the heating fluid, the revaporization ability will decrease.
It may be necessary to increase the size of the device, or there may be a problem of freezing within the revaporizer.

In other words, the atmospheric temperature fluctuates from the lowest freezing point to a maximum of about 30°C, which greatly changes the operating conditions of the fuel gas revaporization equipment, and especially when the atmospheric temperature is low, it is necessary to protect the compressor, etc. I understand. by the way,
When the atmospheric temperature is low, such as in the winter, the maximum output of the turbine increases, but in the summer, the maximum output decreases.
There is no problem of insufficient capacity for the load.

Therefore, when the atmospheric temperature is low, it is necessary to heat the atmospheric air and introduce it into the revaporization device 3, and it can be seen that the influence in this case is small.

Therefore, in the present invention, the atmospheric air flowing into the revaporization device 3 may be adjusted and limited to a temperature above a predetermined temperature using waste gas from a gas turbine or the like.

The atmosphere 5 is converted into a re-vaporizer R using gas turbine waste gas 16.
The temperature of the air 51 flowing into the air filter 3 is limited to a predetermined value or higher, for example, IOc or higher. , the temperature of the air 51 is measured, and the opening degree of the plow flow rate regulating valve 17 is adjusted based on the temperature. 1st
The dashed line in the figure indicates this.

When heating the atmosphere 5 with the waste gas 16, various methods can be considered, but since the waste gas has a lower oxygen content than the atmosphere,
The complete direct mixing of the exhaust gases with the atmosphere is advantageous because the oxygen content of the combustion air 8 is reduced and the nitrogen-oxides generated during combustion are suppressed.

The heating of the atmosphere by the waste gas '16 as described above is carried out when the temperature is below a certain value, for example below 10C.

Although it is well known that liquefied fuel is completely revaporized using waste gas, the present invention is completely new in that it heats the atmosphere with waste gas and thereby performs revaporization. Furthermore, although heating the compressor inlet air with waste gas is well known, heating the air flowing into the liquefied fuel revaporization device with waste gas is completely new to the present invention. New effects such as miniaturization and prevention of freezing can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of a gas turbine device that is an embodiment of the present invention.

Claims (1)

[Claims] 1. In a gas turbine device equipped with a revaporization device that revaporizes liquefied natural gas using air flowing into a gas turbine compressor, the air flowing into the revaporization device is heated with waste gas from the gas turbine. A gas turbine device characterized in that all means are installed to control the temperature so that it does not fall below a predetermined temperature. 2. A gas turbine device according to claim 1, characterized in that the means for heating the air flowing into the revaporization device by the gas turbine waste gas mixes waste gas and air;