US3726239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus useful in combustion gas purification
Assignee: Combustion Engineering Inc
•
Filing: 1971-12-29
•
Granted: 1973-04-10
•
Expires: 1991-12-29
Abstract
Abstract Method and apparatus are disclosed that are useful in the operation of a system in which combustion gases from a steam generator are cleansed of their sulfurous and particulate impurities by wet scrubbing prior to being discharged to the atmosphere. Some of the processed gas is recycled through the scrubber under conditions of low load in order that the effectiveness of the scrubber will not be impeded by reduced gas flow.
Inventors
- 👤 H Burbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:11
CPC Classifications
F; F23; F23J; F23J15/00; F23J15/02; F23J15/04; F23J2900/00; F23J2900/15004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
The method of operating a steam generator including a furnace in which combustion gases are produced, a wet scrubber operative when the flow of gas therethrough is above a predetermined minimum and means for conducting the processed combustion gas to the atmosphere comprising the steps of: a. determining the rate of flow of combustion gases to said scrubber, and b. recirculating a portion of the processed gas from said scrubber back through said scrubber when the rate of combustion gas flow falls below a predetermined minimum flow, the amount of processed gas recirculated being that required to raise the total fLow of gas to said scrubber above said predetermined minimum.
Claim 2
Independent Claim
110 words
The method of operating a steam generator including a furnace in which combustion gases are produced, a wet scrubber operative when the flow of gas therethrough is above a predetermined minimum and means for conducting the processed combustion gas to the atmosphere comprising the steps of: a. determining the rate of flow of combustion gases to said scrubber, and b. recirculating a portion of the processed gas from said scrubber back through said scrubber when the rate of combustion gas flow falls below a predetermined minimum flow, the amount of processed gas recirculated being that required to raise the total fLow of gas to said scrubber above said predetermined minimum.
Claim 3
Dependent Claim
42 words
The method of claim 1 including the step of controllably admitting processed gas to said scrubber in proportion to the deficiency of flow of combustion gas thereto to maintain the total gas flow at a substantially constant value above said predetermined minimum.
Claim 4
Dependent Claim
29 words
The method of claim 1 wherein the rate of flow of combustion gas to said scrubber is determined by measuring the amount of steam produced by said steam generator.
Claim 5
Dependent Claim
92 words
A fuel burning system comprising a furnace within which combustion gases are produced, a wet scrubber arranged to operate effectively when the flow of gas therethrough is above a predetermined minimum, means for conducting said combustion gases to said wet scrubber wherein the same is scrubbed with water, means for conducting the gas processed in said scrubber to the atmosphere, means for diverting a portion of said processed gas and for recirculating the same through said wet scrubber when the flow of combustion gas to said scrubber falls below a predetermined value.
Claim 6
Dependent Claim
92 words
A fuel burning system comprising a furnace within which combustion gases are produced, a wet scrubber arranged to operate effectively when the flow of gas therethrough is above a predetermined minimum, means for conducting said combustion gases to said wet scrubber wherein the same is scrubbed with water, means for conducting the gas processed in said scrubber to the atmosphere, means for diverting a portion of said processed gas and for recirculating the same through said wet scrubber when the flow of combustion gas to said scrubber falls below a predetermined value.
Claim 7
Dependent Claim
29 words
A fuel burning system as recited in claim 4 wherein said wet scrubber comprises a bed of discrete spheroidal particles through which said combustion gas is caused to flow.
Claim 8
Dependent Claim
47 words
A fuel burning system as recited in claim 5 including duct means connecting the discharge end of said scrubber with a stack, a gas recirculation duct connected at one end to said duct means and at its other end to said scrubber upstream of the bed therein.
Claim 9
Dependent Claim
52 words
A fuel burning system as recited in claim 6 including damper means in said gas recirculation duct operated in response to an indication of combustion gas flow to said scrubber and operative to admit processed gas to said scrubber when the combustion gas flow to said scrubber falls below a predetermined value.
Claim 10
Dependent Claim
68 words
A fuel burning system as recited in claim 6 wherein said damper is closed when the flow of combustion gas to said scrubber is above about 500 feet per minute and is operative to regulate the flow of processed gas to said scrubbers to maintain a total gas velocity of about 500 feet per minute when the flow of combustion gas to said scrubber falls below said value.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |