US3860690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppression of nitric oxide
Assignee: Gas Technology Institute
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Filing: 1971-11-03
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Granted: 1975-01-14
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Expires: 1991-11-03
Abstract
Abstract A method and system for suppressing nitric oxide in waste exhaust streams from combustion zones by delivering small amounts of the nitric oxide in a relatively fast moving waste exhaust stream to a zone having a regenerated salt present on a sorbent material where said nitric oxide is collected by forming a complex with said salt. A heated regenerating gas stream decomposes the complex, and a relatively slow moving stripping stream carries away larger amounts of said nitric oxide to a place in the combustion zone having elevated temperatures sufficiently high to decompose the nitric oxide and form nitrogen and oxygen. The regenerating stream converts the sorption zone to a regenerated zone so that a subsequent waste exhaust stream can be moved through the cycle. Purified exhaust streams are carried away from the zones undergoing regeneration and are discharged into the atmosphere. A stream of humid, cooled gas purges the zone undergoing regeneration to prevent entrainment of gases and to also cool and hydrate said zone. The zones are mass exchangers which take the form of fixed beds or a rotary member having adjoining sections which move into the respective zones during rotation.
Inventors
- 👤 Dimitri Gidaspow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:51
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
169 words
A METHOD FOR SUPPRESSING NITRIC OXIDE IN EXHAUST STREAMS FROM A HYDROCARBON COMBUSTION ZONE COMPRISING DELIVERING THE EXHAUST STREAM WITH SMALL AMOUNTS OF NITRIC OXIDE TO A ZONE CONTAINING A SALT SELECTED FROM THE GROUP CONSISTING OF A FERROUS SALT AND A COBALT SALT, SAID SALT BEING SUPPORTED ON A HIGH SURFACE AREA SORBENT MATERIAL TO ACCUMULATE SAID NITRIC OXIDE IN LARGE AMOUNTS AS A NITRIC OXIDE COMPLEX SALT TO THEREBY FORM A SORPTION ZONE, REGENERATING SAID SORPTION ZONE WITH A REGENERATING GAS STREAM HAVING TEMPERATURES SUFFICIENTLY HIGH TO DECOMPOSE SAID NITRIC OXIDE COMPLEX SALT TO FREE THE ACCUMULATED NITRIC OXIDE AND THEREBY FORM A REGENERATED ZONE, RECIRCULATING LARGE AMOUNTS OF NITRIC OXIDE IN A STREAM FROM THE REGENERATED ZONE TO A HIGH TEMPERATURE SUBZONE OF SAID COMBUSTION ZONE TO DECOMPOSE SAID RECIRCULATED LARGE AMOUNTS OF NITRIC OXIDE TO NITROGEN AND OXYGEN AND DELIVERING A SUBSEQUENT EXHAUST STREAM WITH SMALL AMOUNTS OF NITRIC OXIDE TO SAID REGENERATED ZONE TO AGAIN FORM A SORPTION ZONE AND THEREBY REPEAT THE CYCLE.
Claim 2
Independent Claim
169 words
A METHOD FOR SUPPRESSING NITRIC OXIDE IN EXHAUST STREAMS FROM A HYDROCARBON COMBUSTION ZONE COMPRISING DELIVERING THE EXHAUST STREAM WITH SMALL AMOUNTS OF NITRIC OXIDE TO A ZONE CONTAINING A SALT SELECTED FROM THE GROUP CONSISTING OF A FERROUS SALT AND A COBALT SALT, SAID SALT BEING SUPPORTED ON A HIGH SURFACE AREA SORBENT MATERIAL TO ACCUMULATE SAID NITRIC OXIDE IN LARGE AMOUNTS AS A NITRIC OXIDE COMPLEX SALT TO THEREBY FORM A SORPTION ZONE, REGENERATING SAID SORPTION ZONE WITH A REGENERATING GAS STREAM HAVING TEMPERATURES SUFFICIENTLY HIGH TO DECOMPOSE SAID NITRIC OXIDE COMPLEX SALT TO FREE THE ACCUMULATED NITRIC OXIDE AND THEREBY FORM A REGENERATED ZONE, RECIRCULATING LARGE AMOUNTS OF NITRIC OXIDE IN A STREAM FROM THE REGENERATED ZONE TO A HIGH TEMPERATURE SUBZONE OF SAID COMBUSTION ZONE TO DECOMPOSE SAID RECIRCULATED LARGE AMOUNTS OF NITRIC OXIDE TO NITROGEN AND OXYGEN AND DELIVERING A SUBSEQUENT EXHAUST STREAM WITH SMALL AMOUNTS OF NITRIC OXIDE TO SAID REGENERATED ZONE TO AGAIN FORM A SORPTION ZONE AND THEREBY REPEAT THE CYCLE.
Claim 3
Dependent Claim
34 words
A method which includes the steps of claim 1 above, and which further includes the step of introducing a cool, humid gas to the zone undergoing regeneration to purge, cool and hydrate said zone.
Claim 4
Dependent Claim
36 words
A method which includes the steps of claim 1 above, wherein said salt is ferrous sulfate, and said carrier is alumina, said salt being a minor amount by weight of the combination of salt and carrier.
Claim 5
Dependent Claim
37 words
A method which includes the steps of claim 1 above wherein said subzone is a cylinder of an engine, and said stream containing large amounts of nitric oxide being delivered to said cylinder through an engine manifold.
Claim 6
Dependent Claim
26 words
A method which includes the features of claim 1 above, wherein said subzone is a portion of a furnace which develops the highest temperatures during combustion.
Claim 7
Dependent Claim
27 words
A method which includes the steps of claim 1 above, wherein said regenerating stream is heated by an ancillary source separate from and independent of said zone.
Claim 8
Dependent Claim
23 words
A method which includes the steps of claim 1 above, where said regenerating steam is heated by gases arriving from said combustion zone.
Claim 9
Dependent Claim
82 words
A method which includes the steps of claim 1 above, wherein separate beds function alternatively as such zones, said exhaust stream with small amounts of nitric oxide moving to a first bed to form a sorption zone, while a second bed is receiving a regenerating gas stream, and thereafter moving said exhaust stream with small amounts of nitric oxide to said second bed to form a sorption zone, while moving said regenerating stream to said first bed to form a regenerated zone.
Claim 10
Dependent Claim
63 words
A method which includes the steps of claim 1 above, wherein said zones are adjacent sections in a rotary mass exchanger, including the step of rotating said mass exchanger so that the exhaust stream with small amounts of nitric oxide is delivered to a sorbent section, while regenerating gas stream is delivered to a regenerating section, which was previously in said sorption zone.
Claim 11
Independent Claim
33 words
A method which includes the steps of claims 9 above, and which further includes delivering a cool, humid gas to a purging, cooling and hydrating section which previously was in said regenerating zone.
Claim 12
Dependent Claim
57 words
A method wHich includes the steps of claim 10 above, wherein said exhaust stream with small amounts of nitric oxide is delivered at temperatures from about 25* C to about 200* C, said regenerating stream is delivered at temperatures of at least about 150* C, and wherein said sub zone has temperatures of at least 1,800* C.
Claim 13
Dependent Claim
73 words
A method which includes the steps of claim 1 above, wherein the small amounts of nitric oxide in said exhaust stream is present at levels of from 10 parts per million to 5,000 parts per million, said large amounts of nitric oxide and said stripping stream moving at substantially slower velocities so that said large amounts of nitric oxide reach levels of at least about 3 percent by volume of the stripping stream.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |