JPH0568366A - Combined power generation method - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a more efficient combined power generation system by effectively utilizing the region where heat cannot be directly used for power generation. [Structure] The combined power generation system according to the present invention includes an open cycle MHD generator 12 and an open cycle MHD generator 1 that generate power by introducing high-temperature gas from a combustor 11.
A high temperature heat exchanger 2 for heating a rare gas by the combustion gas discharged from 2 and a closed cycle MHD generator 4 for generating power by introducing the rare gas heated by the high temperature heat exchanger 2 are provided. Areas that cannot be used directly
The generators 4 and 12 complement each other.

Description

Detailed Description of the Invention

[0001]

The present invention relates to MHD power generation (Magnetoh
The present invention relates to a combined power generation system utilizing ydrodynamic power generation, and more particularly to a combined power generation system in which an open cycle MHD generator and a closed cycle MHD generator are combined to improve power generation efficiency.

[0002]

MHD power generation is a direct power generation method in which a conductive fluid such as ionized gas (plasma) or liquid metal is moved across a magnetic field to induce a voltage in the fluid by the Faraday effect. Specifically, MHD power generation is a high temperature electromagnetic fluid combustion gas (temperature of about 3000K) obtained by burning coal, heavy oil, natural gas, or high temperature electromagnetic fluid such as helium or argon obtained by passing through a heat exchanger. This is a method of generating electricity by passing a gas (temperature of about 2000 K) as a working fluid in a strong magnetic field instead of an electric conductor in a sonic flow and crossing a magnetic flux (magnetic field). Potassium and cesium, which are called seed substances, are added to the high-temperature gas in order to promote ionization and increase conductivity.

As an example of a conventional combined power generation system utilizing this MHD power generation, FIG. 3 shows a closed cycle MHD combined power generation system and FIG. 4 shows an open cycle MHD combined power generation system.

In FIG. 3, the air compressed and increased in pressure by the compressor 1 is burned in the high temperature heat exchanger 2 to reach a high temperature, and after exchanging heat with the rare gas, it is guided to the gas turbine 3 to be heated. Drives a gas turbine to generate electricity.
The noble gas heated in the high temperature heat exchanger 2 passes through a closed cycle MHD generator (hereinafter, referred to as CCMHD generator) 4 to generate electricity, and then heat is exchanged in the regenerative heat exchanger 5. It becomes low temperature. The noble gas that became low temperature,
After the pressure is increased in the compressor 6, the temperature is raised again in the regenerative heat exchanger 5 and guided by the low pressure side gas turbine 7 to drive the gas turbine 7 to generate electricity. The rare gas that has passed through the gas turbine 7 is re-introduced to the high temperature heat exchanger 2 and is prepared for the next power generation cycle to form a closed loop of the rare gas.

On the other hand, in FIG. 4, the air burned in the combustor 11 is an open cycle MHD generator (hereinafter,
It is called OCMHD generator. ) 12 to generate electric power and heat is exchanged by the radiant boiler 13, the air heater 14 and the boiler 15, and then exhausted. Further, the steam heated by the boiler 15 and the radiant boiler 13 and heated is guided to the steam turbine 16, where the steam turbine 16 is driven to generate electric power, and is also guided to the boiler 15 by the pump 17 to Prepared for a closed cycle of steam.

By the way, the operating temperature range of OCMHD power generation is about 3000K to about 2200K, and the operating temperature range of CCMHD power generation is about 2200K to about 1000K. Then, by utilizing one of these in the high temperature region upstream of the gas turbine or steam turbine, it is conceivable that a high-efficiency combined cycle power generation system that effectively uses high-temperature heat will be obtained.

In this combined power generation system, a region utilizing MHD power generation is called topping, and a region utilizing gas turbine or steam turbine is called bottoming.

[0008]

Since the conventional combined power generation system is a combined power generation system utilizing either OCMHD power generation or CCMHD power generation, in the OCMHD combined power generation system, between the topping and the bottoming, There are areas where heat cannot be directly used for power generation, and CC
In the MHD combined power generation system, there is a problem that a region where heat cannot be directly used for power generation occurs upstream of the CCMHD power generator. For this reason, effective utilization of a region where heat cannot be directly used for power generation is required.

The present invention has been made in consideration of the above-mentioned circumstances, and utilizes a region in which heat cannot be directly used for power generation to effectively utilize heat in a wide temperature range, thereby providing a more efficient combined power generation system. The purpose is to provide.

[0010]

As means for achieving the above object, the present invention provides an open cycle MHD generator for generating power by introducing a high temperature gas from a combustor, and a combustion gas discharged from the open cycle generator. High-temperature heat exchanger that heats the rare gas by means of a closed cycle M that performs power generation by introducing the rare gas heated by the high-temperature heat exchanger
This is a combined power generation system characterized in that an HD generator and a HD generator are respectively provided.

[0011]

In the combined power generation system according to the present invention, the closed cycle MHD generator using the rare gas heated by the combustion gas from the open cycle MHD generator is installed in the downstream region of the open cycle MHD generator. Therefore, the area where heat cannot be directly used for power generation is
Both the generator and the CCMHD generator will complement each other. Therefore, heat in a wide temperature range can be effectively used, and a more efficient combined power generation system can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 11 is a combustor,
Combustion gas from the combustor 11 is generated by the OCMHD generator 1
MHD power generation is performed through the heat exchanger 2, heat exchange with the rare gas is performed in the high temperature heat exchanger 2, heat exchange with the steam is further performed in the boiler 15, and then the heat is discharged.

On the other hand, as shown in FIG. 1, the noble gas whose temperature has been raised by heat exchange in the high temperature heat exchanger 2 passes through the CCMHD generator 4 to generate MHD, and this CCMHD generator is used. Noble gas discharged from No. 4 is boiler 2
After exchanging heat with the steam in 1, the compressor 22 compresses and raises the pressure, and the high temperature heat exchanger 2 recirculates again. This forms a closed loop (closed cycle) of rare gas.

As shown in FIG. 1, the steam heated by the boiler 21 is guided to a steam turbine 23, where the steam turbine 23 is driven to generate electric power, and then boosted by a pump 24 to be boosted. 21 to form a closed loop (closed cycle) of steam.

Further, the steam heated in the boiler 15 is
As shown in FIG. 1, after being guided by the steam turbine 16 to drive the steam turbine 16 to generate electricity, the steam is returned to the boiler 15 by the pump 17 to form a closed loop of steam.

In the combined power generation system shown in FIG. 1, the OCMHD generator 12 and the CCMHD generator 4 are used for topping, and the steam turbines 16, 23 are used for bottoming to form a combined power generation cycle. Therefore, the area where heat cannot be directly used for power generation can be mutually complemented by both MHD generators 4 and 12, and the heat over a wide temperature range can be effectively used to perform more efficient MHD combined power generation. Is becoming

FIG. 2 shows a second embodiment of the present invention, in which the OCMHD generator 12 and CCMH are used for topping.
Steam generator 16 for bottoming using D generator 4
And the gas turbine 7 is used to configure a combined cycle.

In this combined power generation system, OCMHD
The combustion gas that has passed through the generator 12 heats the noble gas in the high temperature heat exchanger 2, and the heated noble gas is C as shown in FIG.
MHD power generation is performed through the CMHD power generator 4, and the rare gas from the CCMHD power generator 4 is heat-exchanged by the regenerative heat exchanger 5 to lower the temperature. The cooled noble gas is sent to the compressor 6 and compressed,
After the pressure is increased, the temperature is again raised in the regenerative heat exchanger 5 and is guided to the gas turbine 7, which drives the gas turbine 7 to generate electricity. Then, the rare gas that has passed through the gas turbine 7 is guided to the high temperature heat exchanger 2 to form a closed loop (closed cycle) of the rare gas.

The other points are the same as those of the first embodiment.

However, even if the combined power generation system is constructed in this way, the same effect as in the first embodiment can be expected.

[0022]

As described above, the present invention provides the OCM.
Since the CCMHD generator is installed in the downstream area of the HD generator, the area where heat cannot be directly used is
The HD generators can complement each other to effectively use heat in a wide temperature range. Therefore, it is possible to obtain a combined power generation method having higher efficiency than the MHD combined power generation method described later.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a combined power generation system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a combined power generation system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional CCMHD combined power generation system.

FIG. 4 is a configuration diagram showing a conventional OCMHD combined power generation system.

[Explanation of symbols]

 2 High temperature heat exchanger 4 CCMHD generator 5 Regenerative heat exchanger 6,22 Compressor 7 Gas turbine 11 Combustor 12 OCMHD generator 15,21 Boiler 16,23 Steam turbine 17,24 Pump

Claims (1)

[Claims] 1. An open-cycle MHD generator that generates electric power by introducing hot gas from a combustor, a high-temperature heat exchanger that heats a rare gas by the combustion gas discharged from the open-cycle MHD generator, and high-temperature heat exchange. A combined cycle power generation system, comprising: a closed cycle MHD generator that generates power by introducing a rare gas heated in a vessel.