JPH1136817A - Power generation facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate electricity with no need for cleaning up generated gas even if fuel including corrosive constituent and ash content such as coals, heavy oil and the like, is being used. SOLUTION: Fuel 10 such as coals, heavy oil and the like is burnt out by a incinerator 2 so as to allow exhaust gas 11 out of the incinerator to be introduced to a ceramics heat exchanger 1. Air 6 is compressed by a gas turbine compressor 3, and let the heat of air 7 at its outlet port be exchanged with that of exhaust gas 11 out of the incinerator by the ceramis heat exchanger 1, so that air at high temperature can thereby be obtained. Air 8 is conducted to the expander 4 of a gas turbine so as to be expanded, so that power driving a generator 5 can thereby be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for producing coal, heavy oil, etc.
The present invention relates to a power generation facility that can use a fuel containing a large amount of corrosive components and ash.

[0002]

2. Description of the Related Art As a conventional power generation facility, there is a combined power generation facility in which fuel obtained by gasifying coal or heavy oil is burned by a gas turbine, and its system is shown in FIG. I do.

In FIG. 4, reference numeral 25 denotes a gasification furnace, and 27 denotes a heat exchanger. 28 is a filter and 31 is a desulfurization device, which constitutes a cleanup system for gasified gas. 29 denotes a combustor of the gas turbine 30, 13 denotes an exhaust heat recovery boiler, 5 denotes a generator, and 15 denotes a steam turbine.

[0004] In the power generation equipment of FIG. 4 having such a configuration, the fuel 10 is charged into the gasification furnace 25 together with the air 23. The gasification gas 26 generated in the gasification furnace 25 is guided to a heat exchanger 27 and cooled, and then filtered,
Dust removal and desulfurization are performed in the desulfurization device 31 to be supplied as a clean gas to the combustor 29 of the gas turbine 30.

[0005] In the combustor 29, separately supplied air 24
As a result, the gasified gas is burned, and the gas turbine 30 is driven. The gas turbine 30 drives the generator 5, and the combustion gas 32 of the gas turbine 30 is introduced into the exhaust heat recovery boiler 13.

The steam generated by the heat recovery steam generator 13 drives the steam turbine 15 to drive the generator 5 to generate electric power.
Released from

[0007]

As described above, coal and heavy oil are fuels containing a large amount of corrosive components and ash, and cannot be directly guided to a gas turbine for combustion. Then, gasify those fuels,
The configuration is such that the gasified gas is led to the gas turbine through a cleanup system having the filter 28 and the desulfurization device 31, and the system is complicated.

[0008] It is an object of the present invention to provide a power generation facility capable of generating power without using a cleanup system for generated gas while using a fuel containing a large amount of corrosive components and ash, such as coal and heavy oil. I have.

[0009]

The present invention, in order to solve the above-mentioned problems, provides a power generation facility having the following configuration. That is, the power generation equipment according to the present invention includes an air compressor, an air expander and a generator rotating coaxially with the air compressor, a combustion furnace, and a heat exchanger.

[0010] The outlet air of the air compressor is heated by the heat exchanger and sent to the air expander.
The outlet air and fuel of the air expander are fed to the combustion furnace and burned. Exhaust gas from the combustion furnace is sent to the heat exchanger to exchange heat with outlet air of the air compressor.

[0011] The power generation equipment according to the present invention has the above-described configuration, and a fuel containing a large amount of corrosive components such as coal and heavy oil and ash is burned in an independent combustion furnace, and the combustion product gas is converted into a heat exchanger. And heat exchange with the air, and the heated air is guided to an air expander for work.

The heat exchanger may be made of a ceramic tube, or may be made of, for example, a ceramic tube for a region having a metal temperature of 650 to 700 ° C. or higher, and a stainless steel or carbon steel tube for a metal temperature of 600 to 700 ° C. or lower. By providing a structure that is resistant to corrosion, a power generation facility that does not cause any problem even when coal or heavy oil containing a large amount of corrosive components and ash is used.

As described above, in the power generation equipment of the present invention, for example, a high-temperature combustion gas of 1300 to 1600 ° C.
High-temperature air of 0 ° C. or more can be generated, and efficient power generation can be performed.

In the power generation equipment according to the present invention, the exhaust gas discharged from the heat exchanger after the air is heated by the heat exchanger is guided to the exhaust heat recovery boiler to generate steam, and the steam power generation cycle is additionally provided. An efficient power generation facility can be provided.

Still further, in the power generation equipment according to the present invention, of the air that has exited the air expander, an excess other than the air guided to the combustion furnace is caused to bypass the combustion furnace and burn the exhaust heat recovery boiler and the fuel. It can be guided to the boiler as combustion air and used effectively.

As described above, according to the present invention, power generation equipment capable of generating power without using a cleanup system for generated gas while using a fuel containing a large amount of ash and corrosive components such as coal and heavy oil. Is provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The power generation equipment of the present invention is shown in FIGS.
A specific description will be given based on the embodiment shown in FIG.
In the following embodiments, the same portions are denoted by the same reference numerals, and redundant description will be omitted.

(First Embodiment) First, a power generation facility according to a first embodiment shown in FIG. 1 will be described. In FIG. 1, 1 is a ceramic heat exchanger, and 2 is a combustion furnace. 3 is a gas turbine compressor, 4 is a gas turbine expander, and both rotate coaxially.

The gas turbine compressor 3 constitutes the air compressor of the present invention, and the gas turbine expander 4 constitutes the air expander of the present invention. A generator 5 rotates coaxially with the gas turbine expander 4.

In the power generation system of FIG. 1 configured as described above, the combustion furnace 2 is supplied with fuel 10 such as coal or heavy oil and air emitted from the gas turbine expander 4 and burns. Exhaust gas 11 reaches the ceramic heat exchanger 1.

The high-pressure air 7 supplied from the gas turbine compressor 3 is heated to 1000 ° C. or higher in the ceramic heat exchanger 1, and the air 8 at the outlet of the heat exchanger 1 is supplied to the gas turbine expander 4 for driving. I do. As a result, power is generated by the generator 5. The air 9 discharged from the gas turbine expander 4 is used as combustion air for burning the fuel 10 in the combustion furnace 2 using residual heat.

(Second Embodiment) Next, a power generation facility according to a second embodiment shown in FIG. 2 will be described. In FIG. 2, reference numeral 13 denotes an exhaust heat recovery boiler to which exhaust gas 12 from the combustion furnace 2 exiting the ceramic heat exchanger 1 is guided.

Reference numeral 15 denotes a steam turbine, and 16 denotes a flue gas treatment facility. The power generation equipment illustrated in FIG. 2 has a configuration in which an exhaust heat recovery system that uses the combustion furnace exhaust gas 12 emitted from the power generation equipment illustrated in FIG. 1 is added to the power generation equipment illustrated in FIG.

In the equipment shown in FIG.
Of the combustion furnace exhaust gas 12 and exhaust air (air) exiting from the gas turbine expander 4 that are not used in the combustion furnace 2 are passed through the excess air bypass 18 to the exhaust heat recovery boiler 1.
3. Steam 1 generated in the heat recovery steam generator 13
4 is supplied to the steam turbine 15 to drive the generator 5 to generate electric power.

(Third Embodiment) Next, a power generation facility according to a third embodiment shown in FIG. 3 will be described. In FIG. 3, reference numeral 21 denotes a damper, and 22 denotes a normal boiler. The power generation equipment shown in FIG. 3 is provided with a boiler 22 instead of the exhaust heat recovery boiler 13 in FIG. Boiler 22 may be a conventional boiler.

That is, in the power generation equipment shown in FIG. 3, the exhaust gas 12 exiting the ceramic heat exchanger 1 is charged into the furnace of the boiler 22 to recover heat. Excess air from the gas turbine expander 4 is supplied to the furnace of the boiler 22 via the excess air bypass 18 from the burner as combustion air for reheating exhaust gas.

[0027]

As described above, the combustion equipment according to the present invention burns fuel in an independent combustion furnace, heats air with exhaust gas generated in the combustion furnace, and supplies the heated air to an air expander. To remove the power.

Therefore, the so-called clean, which removes corrosive components and ash from the gasified gas as required in the conventional integrated coal gasification combined cycle or heavy oil combined cycle system using a filter and a desulfurization apparatus, is called a clean technique. No up system is required in the power plant of the present invention.

In the present invention, the driving gas uses air, and the driving system is excellent in reliability. This is also independent of the fuel for the combustor as a heat source, so that various fuels such as coal and heavy oil are possible.

Furthermore, in the power generation equipment of the present invention, the equipment having high thermal efficiency can be provided by introducing the combustion furnace exhaust gas exiting the heat exchanger to a waste heat recovery boiler or a normal boiler.

[Brief description of the drawings]

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

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

FIG. 3 is a system diagram showing a configuration of a power generation facility according to a third embodiment of the present invention.

FIG. 4 is a system diagram showing a configuration of a conventional combined power plant for coal and heavy oil gasification.

[Explanation of symbols]

 Reference Signs List 1 ceramic heat exchanger 2 combustion furnace 3 gas turbine compressor 4 gas turbine expander 5 generator 6 air (compressor inlet) 7 air (compressor outlet) 8 air (heat exchange outlet) 9 air (expander outlet) 10 Fuel 11 Combustion furnace exhaust gas (heat exchanger inlet) 12 Combustion furnace exhaust gas (heat exchanger outlet) 13 Waste heat recovery boiler 14 Steam 15 Steam turbine 16 Smoke exhaust treatment equipment 17 Chimney 18 Excess air bypass 19 Fuel 21 Damper 22 Boiler

Claims (4)

[Claims] An air compressor, an air expander and a generator rotating coaxially with the air compressor, a combustion furnace, and a heat exchanger, wherein the outlet air of the air compressor is supplied to the heat exchanger. While heating in and sending to the air expander, outlet air and fuel of the air expander are sent to the combustion furnace for combustion, and the exhaust gas of the combustion furnace is sent to the heat exchanger. Characterized in that it is configured to exchange heat with outlet air of the air compressor. 2. The power generation equipment according to claim 1, further comprising a steam power generation cycle for feeding exhaust gas from the outlet of the heat exchanger to an exhaust heat recovery boiler to generate power using generated steam. 3. The power generation equipment according to claim 2, wherein a part of outlet air of the air expander is supplied to the exhaust heat recovery boiler by bypassing the combustion furnace. 4. The power generation equipment according to claim 3, wherein a boiler for burning fuel is installed in place of the exhaust heat recovery boiler.