Power plants – Motive fluid energized by externally applied heat – Having apparatus cleaning – sealing – lubricating – purging,...
Patent
1981-10-15
1983-07-12
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Having apparatus cleaning, sealing, lubricating, purging,...
60670, 432 14, F01K 1500, F27B 1500
Patent
active
043923534
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method of recovering exhaust gas produced when combustible material is burned to produce electric power and an apparatus for performing such a method.
BACKGROUND ART
Generally, in the thermal power generation, combustible solids such as coal and oil shale, or combustible liquids such as heavy oil and waste oil are used as a fuel. One difficulty encountered in a conventional thermal power plant has been the problem of treating exhaust gas from an associated boiler in which the fuel is burned.
One reason for this is that the temperature of the exhaust gas has to be controlled at a stage prior to the dust removing stage since the exhaust gas is maintained usually at a relatively high temperature of about 300.degree. C. at the outlet of the boiler of the thermal electric power generating device. Another reason is that a desulfurizing device has to be provided for removing oxides of sulfur from the exhaust gas. A further reason is that it has been difficult to treat the ash contained in the exhaust gas. Particularly, where the desulfurizing device is installed, a difficulty has arisen from the fact that the overall construction cost of the thermal power plant is high. Another disadvantage has been that the amount of a desulfurizing agent to be used is large. A further disadvantage has been that it is difficult to treat the products formed by the reaction of the desulfurizing agent with the sulfur oxides, as is the case with the treatment of the ash in the exhaust gas. Particularly where coal is used as a fuel in the production of electric power, the problem of treating the ash and the sulfur oxides has become more and more serious.
It is an object of this invention to provide a method of using exhaust gas from an electric power generating device as a heat source and efficiently treating the ash contained in the exhaust gas.
Another object is to provide a method of efficiently treating sulfur oxides contained in the exhaust gas without the use of a special desulfurizing device.
A further object is to provide an apparatus for performing such methods.
DISCLOSURE OF THE INVENTION
In the method according to the invention, exhaust gas from a boiler of an electric power generating device is fed to a preheat section of a powder raw material treating device. The ash contained in the exhaust gas is recovered as part of the powder raw material, and the exhaust gas is recovered as part of a heat source for preheating the powder raw material. The powder raw material may contain a desulfurizing component to remove the sulfur oxides from the exhaust gas.
In the apparatus according to the invention, a thermal electric power generating device and a powder raw material sintering device are connected by an exhaust gas conduit. The thermal electric power generating device comprises a boiler, a heat exchange water pipe arranged in the boiler, a turbine rotated by the steam from the water pipe, and a power generator actuated by the rotation of the turbine. The powder raw material sintering device comprises a preheat section, a sintering section connected to the preheat section, and a cooling section connected to the sintering section. The outlet of the boiler of the electric power generating device and the preheat section are connected by the exhaust gas conduit.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagrammatic elevational view of an apparatus for recovering exhaust gas from a combustion furnace in a thermal electric power generating device, the apparatus being provided in accordance with a first embodiment of the invention in which the exhaust gas is fed to a duct of a suspension preheater of a powder raw material sintering device through a conduit;
FIG. 2 is a diagrammatic elevational view of the electric power generating device having a modified boiler;
FIG. 3 is a diagrammatic elevational view of an apparatus for recovering exhaust gas from the boiler, the apparatus being provided in accordance with another embodiment of the invention in which the exhaust gas
REFERENCES:
patent: 2498710 (1950-02-01), Roetheli
patent: 4045162 (1977-08-01), Christiansen
patent: 4071309 (1978-01-01), Yamane
patent: 4126000 (1978-11-01), Funk
Ihara Tomomi
Shibuya Kyoichi
Husar Stephen F.
Ostrager Allen M.
Sumitomo Semento Kabushiki Kaisha
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