JPS59105909A - Compound electric power generating system by fuel cracking - Google Patents

Abstract

PURPOSE:To obtain high power generating efficiency even when methanol or the like is employed as fuel and enable to set the amount of high pressure steam produced at starting in a short time by a method wherein a fuel cracking reactor is arranged in an exhaust branch pipe in order to convert the supplied fuel into the secondary fuel with higher energy by utilizing waste heat energy. CONSTITUTION:The fuel to supply to a gas turbine 2a is in advance heated by the fuel preheater 7a of an exhaust main pipe 3a and chemically reacted and converted into the secondary fuel with higher fuel energy by being given the heat energy of the high temperature exhaust gas (c) from a gas turbine 2a by means of the fuel vaporizer 7b in an exhaust branch pipe 8a. Accordingly, because the heat energy of the exhaust gas (c) is effectively given to both a steam generator 3c and a fuel cracking reactor 7b, the power generating efficiency can be enhanced. In addition, the amount of high pressure steam developed in the steam generator 3c at the starting of a system can be set in a short time. Even if trouble occurs in the fuel cracking reactor 7b, the influence of the trouble does not spread to the steam generator 3c.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel cracking combined cycle system with high power generation efficiency.
It is attracting attention as a new l/1 technology that can make use of glue such as NG vaporized gas in a permanent manner. Figure 1 is a
) Species C] System A 9) It is a schematic diagram showing the schematic configuration.

The fuel a't supplied for the first time during combustion is overfired with the combustion air, and the combustion energy is used to drive the gas turbine power generation system.C) Gas turbine power generation system.
The generator 2b driven by the turbine output is also equipped with an air compressor 2cf for the baking air to obtain the power generation output. Then, the high temperature exhaust gas C from the turbine power generation system is discharged through the exhaust pipe Jaffi of the exhaust p5 boiler system. A built-in steam generator 3C is provided and is configured to recover the thermal energy of the exhaust gas C to generate steam. Supply to steam turbine 4a +t
4j, the generator 4b is driven, and the turbine output is
7: To be able to be loved. Note that the steam turbine 4
The steam after driving a is supplied to the condenser 5;
After being cooled and liquefied by the cooling water d, it is supplied to the feed water preheater 3H via the cooling pump 6, and further heated by the steam generator 3C to become steam for use.

By the way, the above system generally uses fuel a.
It has been developed with the assumption that methane (CI(4)) will be used as the main vaporized gas.On the other hand, recently, methanol (Cn3oH), an alcohol with a small number of carbon atoms, and a fuel a Attempts have been made to use this methanol as a starting material from various hydrocarbon sources such as natural gas, lime, browning, lignite, heavy oil, petroleum coke, and wood. It is attracting attention as a highly pure oxygenated hydrocarbon compound that is liquid at room temperature and has properties comparable to gasoline.It is also a highly pure oxygenated hydrocarbon compound from which impurities such as sulfur and sulfur are removed during production. It is useful as a fuel for IJ-ons.

However, while the heat of combustion of methane (CH4) is 212.8 ki7'mol on a high-level basis, that of methane/l/(Cf130H) is 182.6
kJ/mo is as low as 1. There are also problems such as a high steam generation ratio per unit combustion heat and a large amount of heat loss when the exhaust gas C is released. For this reason, there is a problem that when using methanol as the fuel, power generation efficiency becomes low.

Here, as a measure to increase power generation efficiency, a fuel preheater 7a and a fuel cracking reactor 7b are installed at the downstream end and upstream end of the exhaust pipe 3a, respectively, as shown in FIG. Fuel a'ff: The above-mentioned fuel preheater 7a and fuel cracking reactor 7b'ff: It is possible to convert the fuel into a secondary fuel with high combustion energy and supply it to the mJ gas turbine 1. This has already been filed by the applicant (Japanese Patent Application No. 57-164090'i).

However, the structure shown in Figure 2 leaves room for improvement in the following points.

Since pi'q and l are disposed at the upstream end of the fuel cranking reactor 7b or the bleed pipe 3a, the heating effect is less in the steam generator 3C disposed downstream from pi'q and l. Second, since the fuel cranking reaction, d*7b, is below the operating temperature when the system is started, a separate fuel system is installed; When the fuel cracking reactor 7b reaches a predetermined temperature, it is necessary to operate the reactor 7b and convert it into cash with the separately provided fuel system Affc. , this fuel system Q] until the switching is completed, the steam generator 3
There is a problem that the generator of high pressure steam from C does not settle. .

Thirdly, if there is any trouble in the fuel cranking reactor 7b, especially fuel leakage, the influence may extend to the steam generator 3C on the downstream side, and secondary damage may occur.

The present invention has been made taking all of these circumstances into consideration, and its highlight is that it is a combined power generation system that is equipped with a gas turbine and a steam turbine that is driven by the exhaust heat energy of the J turbine. In V), a fuel cranking reactor is disposed in the exhaust branch pipe, and the fuel supplied to the gas turbine is chemically reacted using the exhaust heat energy of the gas turbine, and the combustion energy of the fuel is reduced to 0- ), it is possible to obtain a high power generation efficiency even when methanol is used as a fuel, and a steam turbine system It is possible to quickly stabilize the amount of high-pressure steam generated from the steam generator at the time of system startup without reducing the heating effect on the steam generator, and even in the unlikely event that trouble occurs with the fuel cracking reactor. The purpose is to prevent C) the influence from reaching the steam generator. Below, we will explain one embodiment of the system of the present invention shown in Fig. 3. Fig. 3 is an illustration of a fuel cranking combined cycle power generation system. (This is a simplified illustration of the structure. The same parts as the systems in FIGS. 1 and 2 are designated by the same A and No. 1.

The motivation for this system is that the gas turbine 28
Exhaust main pipe that circulates still hot exhaust gas (Fig. 1, ε1 le 2
A bleed branch pipe 8a'' (same configuration as the exhaust pipe 3a shown in the figure) is provided by connecting the upstream end and the downstream end of the exhaust main pipe 3a, similar to the system shown in Figure 2. , upstream [il
A hot air generator 3c and a water preheater 3b are located downstream from l.
A fuel preheater 7a' (z) is provided, and a fuel pumping reactor (b) is provided in the exhaust branch pipe 8a.

'l-1ii A branch duct artificial damper 8b and a branch duct outlet damper 8 are provided at the inlet and outlet of the air branch pipe 8a, respectively.
C is provided, and is configured to be able to control the flow of exhaust gas that is divided within the exhaust branch pipe 8a. ′! l: At least the steam generator 3C and the feed water preheater 3b are connected to the exhaust main pipe 3a.
The damper is self-installed at a position between the input damper 8b and the exit damper 8c in the damper.

Therefore, the fuel gas supplied to the nut turbine 2a is as follows:
The fuel is heated in advance by the fuel preheater 7a in the exhaust main pipe 3a, and further heated by the fuel vaporizer 7b in the exhaust branch pipe 8a.
The full thermal energy of the hot exhaust gas C from the J turbine 2a is applied to cause a chemical reaction (cranking reaction).
It will be converted into secondary fuel with high combustion energy.

Therefore, according to the system configured as described above, the total thermal energy of the exhaust gas C of the gas turbine 2a can be effectively given to both the gas starter 3cJ6 and the fuel cracking reactor 7b, thereby increasing the power generation efficiency. be able to.

Further, the steam generator 3C is disposed in the exhaust main pipe 3a, and the fuel cranking reactor 7b is disposed in the exhaust branch pipe 8a, so that the fuel cranking reactor 7b is disposed in the steam generator 3C.
The heating efficiency will not be reduced completely.

Furthermore, a steam generator 3C and a fuel cracking reactor 7c
Since these do not affect each other, for only one of 1 and 11, 1 cow power, driving mode, and 47. 'J size T71e jX arrival - You can change it freely.

1. The amount of high-pressure steam generated from the steam generator 3c at the time of system startup can be adjusted in a short time, and even if trouble occurs in the fuel cranking reactor 7b, the effect will be Since it is not as good as generator 3C, 2
As detailed above, according to the present invention, a high power generation efficiency is obtained, and the heating effect on the steam generator of the steam turbine system is not reduced. The generator of high-pressure steam from the steam generator at system start-up of 11 hours can be stabilized in a short time, and even if trouble occurs in the fuel cranking reactor, the effect will not be affected by the steam generator. It is possible to provide a fuel cracking plate platform power generation system that can prevent secondary damage without causing damage.

[Brief explanation of drawings]

FIGS. 1 and 2 are schematic configuration diagrams for explaining the background technology of the present invention, and FIG. 3 is a schematic diagram of an embodiment of the present invention;
74 compositions. 2a'-gas turbine, 2b-generator, 3a'=exhaust main pipe, 3b...heater for water supply''', 3C...dry generator, 4a...steam turbine, 4b...・Generator, 2
a... Mold (heater, 7b... Fuel cranking reactor, 8a... Exhaust branch pipe.

Claims (1)

[Claims] A gas turbine power generation system, an exhaust main pipe through which high-temperature exhaust gas from the gas turbine power generation system flows, an exhaust branch pipe provided to connect the upstream end and downstream end of the exhaust wood pipe, and the above-mentioned exhaust pipe. A steam generator disposed between the exhaust branch pipe inlet and the outlet in the exhaust main pipe, a steam turbine power generation system driven by high pressure steam generated from the steam generator, and a steam turbine power generation system disposed within the exhaust branch pipe. and a fuel cranking reactor that chemically reacts the fuel supplied to the gas turbine power generation system with the thermal energy of the exhaust gas flowing through the exhaust branch pipe to convert it into a secondary fuel with high combustion energy. A fuel cracking combined power generation system characterized by: