Heating – Work chamber having heating means – Combustion products heat work by contact
Patent
1991-04-17
1992-09-08
Yuen, Henry C.
Heating
Work chamber having heating means
Combustion products heat work by contact
432181, 65135, F27D 1700, C03B 516
Patent
active
051453630
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for the substantially continuous purification of an oxygen-containing gas containing combustible contaminants by a thermal and/or catalytic combustion process during which at least part of the heat of combustion is recovered by a regenerative heat exchange in two stationary, substantially identical zones comprising solid heat exchange material and separated by a combustion chamber, in which method the air to be purified flows through both of the heat exchange zones and the direction of flow through the zones is reversed periodically such that the two zones are alternately heated and cooled in periods of 0.1 to 60 minutes, preferably 0.5-60 minutes and especially 1-30 minutes.
The invention also relates to an apparatus for carrying out the method according to the invention, provided with a substantially symmetrical reactor having a central combustion chamber with a source of heat and a valve-guided line for discharging the purified gas to a recipient, e.g. a stack; two identical heat exchange layers being placed adjacent or close to the combustion chamber, one at each side thereof, optionally separated therefrom by a catalyst layer; an end chamber being placed adjacent each heat exchange layer at the side thereof farthest from the combustion chamber; said end chambers each being connected to a line provided with valves for admitting untreated gas from a common supply line, and lines provided with valves for discharging the purified gas to the recipient.
Thus, the method and the apparatus according to the invention aim at the catalytic or thermal oxidation of off-gases, notably offgases containing organic solvents from, e.g., offset printing, lacquering and surface finishing while utilizing regenerative heat exchange. Likewise, offgases containing malodorous or harmful substances from organic-chemical syntheses or hardening of polymeric materials and malodorous offgases from the food and feed processing industries, or, e.g., water purification plants may advantageously be purified by the present method.
BRIEF DESCRIPTION OF THE DRAWINGS
The method and the apparatus according to the invention and the technical background thereof is best explained with reference to the drawings. In the drawings
FIGS. 1a and 1b show two known apparatuses suitable for carrying out the method defined hereinabove, and
FIGS. 2 and 3 show two different apparatuses for carrying out the method according to the invention.
The apparatus shown in FIG. 2 is adapted for catalytic combustion, that in FIG. 3 for thermal combustion.
Identical reference numerals in the various figures denote parts that are identical in principle.
BACKGROUND OF THE INVENTION
It is known that offgases as for instance those mentioned may be purified by a catalytical or thermal combustion in which the offgases are heated to temperatures of 200.degree.-450.degree. C. necessary for the catalytical combustion and 700.degree.-1000.degree. C. for the thermal combustion, the heating taking place by a regenerative heat exchange with the hot, purified gases coming from the combustion. The gas is passed through porous layers or blocks of stones, ceramics or metal placed before and after the reaction chamber and the direction of flow is reversed with intervals from 1/2 minute to an hour depending on, i.a., the relation between the heat capacity of the heat exchange layers and the heat capacity of the gas stream per unit time. FIG. 1a shows a known embodiment of an apparatus functioning according to this principle. In a cylindrical vessel, a reactor, there is placed two identical, porous heat exchange layers 10 and 11, e.g. made of ceramic balls, followed by two identical layers 12 and 13 of a combustion catalyst, the two pair of layers being situated adjacent an empty space, functioning as a combution chamber 15 in the middle of the reactor.
A burner or an electric heater 16 is used to start the reactor and to supply heat to the process if the heat of combustion from the combustible components of the ga
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Jensen Frands E.
Nielsen Kai H.
Haldor Topsoe A/S
Yuen Henry C.
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