US3875678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for purifying exhaust air of a dryer apparatus
Assignee: Vits Maschinenbau GmbH
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Filing: 1974-01-04
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Granted: 1975-04-08
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Expires: 1994-01-04
Abstract
Abstract A method and apparatus for dryers for products containing volatile hydrocarbons such as impregnated hard board, electrical insulation having insulating varnish, aluminum sheets coated with varnish, etc.; the products being dried normally producing, during drying, gaseous hydrocarbons which, for ecological reasons, cannot be discharged directly into the atmosphere but which must be "treated;" the method and apparatus concerning a two-sectioned dryer in series in which the material being dried, passes from section to section; in the first section the more volatile hydrocarbons are driven off and are "after-burned" with the heat of combustion being recovered and used to heat the dryer sections; the second section having less volatile hydrocarbons driven off which are "washed" or condensed; the hydrocarbons precipitating out during "washing" being used as a fuel to assist in the "after-burning" of the more volatile hydrocarbons; the washed exhaust from the second section and exhaust gases from "after-burning" of the more volatile hydrocarbons being combined after washing and after-burning for dehumidification of the washed exhaust and discharged directly into the atmosphere.
Inventors
- 👤 Hilmar Vits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:24
CPC Classifications
F; F26; F26B; F26B25/00; F26B25/005; F26B23/00; F26B23/02; F26B23/022
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A METHOD FOR PURFYING THE EXHAUST PRODUCTS FROM DRYING APPARATUS FOR PRODUCTS CONTAINING LIGHT (LOW-BOILING) AND HEAVY (HIGH-BOILING) HYDRCOARBONS WHICH BECOME VOLATIVE DURING DRYING OF THE PRODUCTS AND WHICH ARE BURNED IN A FLAME PRIOR TO BEING EXHAUSTED INTO THE ATMOSPHERE, COMPRISING: MOVING THE PRODUCT TO BE DRIED THROUGH TWO CONSECUTIVE SECTIONS OF A DRYER INTO CONTACT WITH A HEATING MEDIUM AT A TERMPERATURE SO THAT LIGHT (LOW-BOILING) HYDROCARBONS ARE FIRST VOLATILIZED MAINLY IN THE FIRST SECTION AND IN WHICH HEAVY (HIGH-BOILING) HYDROCARBONS ARE VOLATILIZED MAINLY IN THE SECOND SECTION, DIRECTLY AFTER-BURNING THE VOLATIVE EXHAUST PRODUCTS OF THE FIRST SECTION, AND WASHING THE VOLATILE EXHAUST PRODUCTS OF THE SECOND SECTION, PRODUCING A RESIDUE INCLUDING HEAVY HYDROCARBONS AND DIRECTING THE RESIDUE TOGETHER WITH BURNABLE MATERIAL OF BURNED EXHAUST PRODUCTS OF THE FIRST SECTION AND BURNING IT WITH THE RESIDUE.
Claim 2
Independent Claim
138 words
A METHOD FOR PURFYING THE EXHAUST PRODUCTS FROM DRYING APPARATUS FOR PRODUCTS CONTAINING LIGHT (LOW-BOILING) AND HEAVY (HIGH-BOILING) HYDRCOARBONS WHICH BECOME VOLATIVE DURING DRYING OF THE PRODUCTS AND WHICH ARE BURNED IN A FLAME PRIOR TO BEING EXHAUSTED INTO THE ATMOSPHERE, COMPRISING: MOVING THE PRODUCT TO BE DRIED THROUGH TWO CONSECUTIVE SECTIONS OF A DRYER INTO CONTACT WITH A HEATING MEDIUM AT A TERMPERATURE SO THAT LIGHT (LOW-BOILING) HYDROCARBONS ARE FIRST VOLATILIZED MAINLY IN THE FIRST SECTION AND IN WHICH HEAVY (HIGH-BOILING) HYDROCARBONS ARE VOLATILIZED MAINLY IN THE SECOND SECTION, DIRECTLY AFTER-BURNING THE VOLATIVE EXHAUST PRODUCTS OF THE FIRST SECTION, AND WASHING THE VOLATILE EXHAUST PRODUCTS OF THE SECOND SECTION, PRODUCING A RESIDUE INCLUDING HEAVY HYDROCARBONS AND DIRECTING THE RESIDUE TOGETHER WITH BURNABLE MATERIAL OF BURNED EXHAUST PRODUCTS OF THE FIRST SECTION AND BURNING IT WITH THE RESIDUE.
Claim 3
Dependent Claim
34 words
The method according to claim 1 including the step of supplying sufficient supplemental fuel to the after-burning for igniting and maintaining continuous after-burning of both the light hydrocarbons and the residue including heavy hydrocarbons.
Claim 4
Dependent Claim
31 words
The method according to claim 1 including mixing the exhaust products from the second section, purified by washing, with afterburned exhaust products and emitting them as a mixture into the atmosphere.
Claim 5
Dependent Claim
47 words
The method according to claim 2 including heating in a heat-exchanger a heat-absorbing medium by the after-burner and directing the heated heat-absorbing medium to the respective dryer sections for treating the product being dried as it successively passes through the first and second sections of the dryer.
Claim 6
Dependent Claim
101 words
Apparatus for purifying the exhaust air from a dryer containing volatile hydrocarbons comprising: a dryer divided in consecutive chambers through which a product being dried is moved; means in said chambers for passing heated air over said product; individual exhaust conduit means connected to the respective chambers for drawing off exhaust air containing light (low-boiling) hydrocarbons and heavy (high-boiling) hydrocarbons as they become volatile in the respective chambers; after-burning means connected to the conduit receiving the light hydrocarbons for burning the same; and washing means connected to the conduit receiving the volatile heavy hydrocarbons for precipitating a residue including heavy hydrocarbons.
Claim 7
Dependent Claim
101 words
Apparatus for purifying the exhaust air from a dryer containing volatile hydrocarbons comprising: a dryer divided in consecutive chambers through which a product being dried is moved; means in said chambers for passing heated air over said product; individual exhaust conduit means connected to the respective chambers for drawing off exhaust air containing light (low-boiling) hydrocarbons and heavy (high-boiling) hydrocarbons as they become volatile in the respective chambers; after-burning means connected to the conduit receiving the light hydrocarbons for burning the same; and washing means connected to the conduit receiving the volatile heavy hydrocarbons for precipitating a residue including heavy hydrocarbons.
Claim 8
Dependent Claim
37 words
The apparatus as claimed in claim 5 including heat-exchanger means connected in series with the after-burner means for recovering heat produced at the after-burner means; and means for directing the recovered heat to the respective dryer chambers.
Claim 9
Dependent Claim
52 words
The apparatus as claimed in claim 5 including sump means operatively connected to said wash means for recovering the precipitated residue including heavy hydrocarbons; and means connected between said sump means and said after-burner means for burning the precipitated residue including heavy hydrocarbons and said light hydrocarbons together in the after-burner means.
Claim 10
Dependent Claim
35 words
The apparatus as claimed in claim 6 in which said heat-exchanger means includes a heat-carrier comprising a heat-absorbing fluid, and means for circulating the heat-absorbing fluid through the heat-exchanger means and about said dryer chambers.
Claim 11
Dependent Claim
30 words
The apparatus as claimed in claim 7 including nozzle means connected to the after-burner means and said sump means for directing the precipitated residue including hydrocarbons into the after-burner means.
Claim 12
Dependent Claim
27 words
The apparatus as claimed in claim 6 including auxiliary burners in said after-burner means for providing supplemental igniting fuel to maintain continuous operation of said after-burner means.
Claim 13
Dependent Claim
60 words
The apparatus as claimed in claim 6 including exhaust gas conduits each respectively connected to one of the washing means and said heat-exchanger means, and a common flue-gas conduit joining the respective exhaust conduits whereby the wet exhaust gas from the washing means and causes products passing through said heat exchanger means are mixed prior to discharge into the atmosphere.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |