Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Reexamination Certificate
2000-09-05
2004-10-19
Elve, M. Alexandra (Department: 1725)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
C422S198000
Reexamination Certificate
active
06805845
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to an exhaust gas treatment system for treating exhaust gas containing organic component, such as exhaust gas generated from a painting facility, a semiconductor/electronic component manufacturing factory, etc. More particularly, the invention relates to such exhaust gas treatment system adapted for treating the exhaust gas by oxidizing/decomposing the organic component contained in the gas.
2. Description of the Related Art
For oxidizing/decomposing an organic component contained at a low concentration in exhaust gas to clean the exhaust gas and also recovering the heat generated in association with the decomposition for use as an energy source for running the factory (e.g., as energy source for the main production activity of the factory), there have been proposed and practiced a variety of schemes as follows. According to one such scheme, the organic component in the exhaust gas is condensed by means of a condensing device to produce condensed gas having an enhanced concentration of organic component. Then, this condensed gas is charged into a combustion device adapted for exhaust gas treatment, such as direct combustion type, catalytic combustion type, regenerative combustion type device, etc., so that the organic component is combusted therein, and the heat retained in the resultant combustion exhaust gas (i.e., cleaned gas) from the combustion device is recovered through a heat exchanger. According to another scheme, the treatment-object exhaust gas or the condensed gas thereof is fed, together with oxygen-containing combustion gas, to a burner of a boiler used as the heat source of the factory, so that the organic component therein is combusted and the heat generated during the oxidation/decomposition of the organic component in the exhaust gas is collected in the form of steam generated from the boiler.
The prior art has proposed still another scheme whose implementing system is illustrated in FIG.
4
. It is said that this scheme, in addition to the oxidation/decomposition of the organic component in the exhaust gas, provides a further advantage over the above-described schemes by allowing even more efficient utilization of the decomposition heat (ie., the chemical energy present within the organic component in the exhaust gas) for the factory operation. More particularly, in the system implementing this scheme, treatment-target exhaust gas A is charged, as the oxygen-containing combustion gas, into a gas engine
30
together with a fuel G so as to run this engine
30
. Then, the organic component in the gas A will be subjected to oxidation/decomposition process during the combustion process in the engine
30
. Further, a generator
31
is driven by the output of this engine to generate electric power E which in turn is used for the main factory operation; and also the heat retained in engine exhaust gas D exhausted from the engine
30
is recovered by a heat exchanger
32
to be used as heat source which is to be used also for the main factory operation.
With the above-described exhaust gas treatment system utilizing a gas engine (i.e., a so-called “co-generation system” modified to act also as an exhaust gas treatment system), the oxidation/decomposition heat of the organic component is recovered in the form of electric power E. Thus, compared with the conventional systems in which the oxidation/decomposition heat of the organic component in exhaust gas is recovered in the form of heat recovered from the combustion exhaust gas or steam generated from a boiler, the above system may utilize the oxidation/decomposition heat of the organic component of exhaust gas more efficiently as energy source for factory operation. Hence, enhanced energy saving and further reduction in CO
2
generation may be obtained.
With such gas engine, however, its intake amount of oxygen-containing combustion gas (i.e., combustion air) is rather limited. Thus, according to such exhaust gas treatment system using a gas engine, even if this system employs the scheme of feeding the condensed gas which has its organic component concentration enhanced and its amount reduced by a condensing device to the gas engine
30
as the oxygen-containing combustion gas therefor, it is difficult for this system to efficiently treat a large amount of exhaust gas with a low concentration of organic component generated from a painting facility or semiconductor/electronic component manufacturing factory. For this reason, in those factories which generate a relatively large amount of exhaust gas needing treatment, as illustrated in
FIG. 5
, if a co-generation system using a gas engine (i.e., a system in which a generator
31
is driven by a gas engine
30
and heat retained in the exhaust gas D from the engine is recovered through a heat exchanger
32
) is to be implemented for achieving higher energy saving and CO
2
generation reducing effects, this is feasible only through the conventional scheme in which condensed gas B′ with organic component concentration enhanced through a condensing device
1
is introduced into an exhaust-gas treating combustion device
33
for combustion of the organic component therein (or through the alternative conventional scheme, illustrated in this
FIG. 5
by broken lines, in which only a portion of the exhaust gas A to be fed to the exhaust-gas treating combustion device
33
or condensed gas B′ thereof is fed to the gas engine
30
as its oxygen-containing combustion gas).
In view of the above-described state of the art, a primary object of the present invention is to provide an exhaust gas treatment system capable of achieving efficient treatment of a large amount of exhaust gas by recovering oxidation/decomposition heat of organic component in the exhaust gas in the form of electric energy as well as equivalent or higher energy saving effect and CO
2
generation reducing effect as compared with the conventional exhaust gas treatment system using a gas engine.
SUMMARY OF THE INVENTION
For fulfilling the above-noted object, according to the present invention, an exhaust gas treatment system comprises:
a condensing device for condensing an organic component contained in exhaust gas to be treated so as to produce condensed gas with an enhanced organic component concentration;
a gas turbine for receiving the condensed gas from the condenser device as oxygen-containing combustion gas and then generating power; and
a generator operable to receive the power from the gas turbine for generating electric power.
Compared with a gas engine of an equivalent output, a gas turbine allows a larger intake of oxygen-containing combustion gas. Therefore, if the gas turbine is driven by both fuel and the exhaust gas as its oxygen-containing containing combustion gas, the gas turbine can treat a large amount of exhaust gas by oxidizing and decomposing the organic component in the exhaust gas through its combustion therein in a more efficient manner than the above-described gas-engine type system shown in
FIG. 4
; and heat generated in association with the oxidization/decomposition process may be recovered in the form of electric energy from the generator driven by the gas turbine.
Such gas turbine, however, consumes a larger amount of fuel than a gas engine of equivalent output. Therefore, if exhaust gas with a relatively low organic component concentration (e.g., exhaust gas with an organic component concentration ranging 100 to 500 ppm approximately), such as the exhaust gas generated from a painting facility or semiconductor/electronic component manufacturing factory, is directly fed to the gas turbine as the oxygen-containing combustion gas, the reduction in the fuel consumption amount enabled by the introduction of the organic component of the exhaust gas will be rather limited, so that the fuel consumption amount of the entire system will be still greater than the conventional gas-engine type treatment system and its energy saving effect and CO
2
generation reducing effect will be low
Elve M. Alexandra
Taikisha Ltd.
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
LandOfFree
Exhaust gas treatment system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Exhaust gas treatment system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exhaust gas treatment system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3322576