Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1994-10-20
1997-12-23
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
422171, 422175, 422177, 422180, 422198, 422206, 422200, 422211, 422222, 165166, 165167, F01N 310
Patent
active
057004340
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a reactor for catalytically processing gaseous fluids in which, along with a catalytic reaction, a heat exchange takes place.
The use of catalysts for purification of outgoing air, e.g., of a solvent-containing industrial air and air used in technical synthesis, is known. The outgoing air is conducted through a reactor in which a catalyst is provided. It is typical for a catalytic oxidation that, on one side, the processed fluid is heated to a predetermined temperature so that a catalytic reaction can take place, and that, on the other hand, during a catalytic reaction, heat is released by an exothermal reaction.
As result, it is necessary to evacuate the released heat to avoid overheating and destruction of the catalyst and to supply heat, especially at the beginning of the reaction.
To this end, it is already become known to provide outgoing air reactors, in which the flow direction is periodically changed. With a high technical output, a particular drawback consists in that, during the change of the flow direction, the air, which remains in the former inlet, is discharged without being purified.
It was also suggested to conduct catalytic purification of the outgoing air in a rotatable catalyzer. At that, the stream of outgoing air due to the rotational movement of the catalyzer, flows through the catalyzer interchangeably radially or axially. However, the use of rotatable parts presents problems from the sealing point of view and, in addition, the change of the flow direction results in creation of so-called dead volume of non-purified air.
Accordingly, a particular object of the present invention is a reactor of the above-mentioned type that would enable a continuous operation without the change of the flow direction.
According to the invention, this object is achieved by so arranging the fluid path-defining elements in the reactor housing that channel-shaped structures having sectionally arranged catalytically acting regions, are formed. It has been found out that with such an arrangement, different temperature zones can be obtained at the same flow direction of the fluid. It is exactly this distribution of the temperature zones is desirable or required for catalytic purification of the outgoing gases.
It was proved to be especially advantageous when the structures have a non-flat outer surface, e.g., a corrugated outer surface, provided with a catalyst only in its middle area, so that both the beginning and end regions have no catalytic regions.
The corrugated structure of plates provides for forming flow channels between respective plates with a very high local heat and mass transfer at the plates.
This effect is advantageously used when, according to the invention, the outgoing air flows through two adjacent channels in accordance with a counterflow principle.
To this end, the fluid flow is divided so that fluid flows in the same direction only in every other channel. Thereby, it is achieved that in the first corrugated plate region, which does not have a catalyst, the heat from air, which has already passed the catalyst and which was heated by an exothermal reaction, is transferred to this plate region, and the air, which has yet to be subjected to the catalytic treatment and which flows in the adjacent channel, is preheated due to heat transfer. In the second corrugated plate region, which likewise does not have a catalyst, the same heat transfer takes place, but in the opposite direction.
In accordance with a further development of the invention, it is contemplated that fluid flows through two respective, connected with each other, adjacent channels so that the reaction heat, which is generated in a fluid stream, can be transferred to the same stream for preheating.
Instead of being sealed, the channels can end in a common collecting channel, with branching therefrom into respective adjacent channels. Such flow configuration results in that the fluid is compulsorily delivered to the reactor at the same pressure.
In an advantageous embodiment of the invention, it is conte
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Tran Hien
Warden Robert J.
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