Air pollution control
Abstract
Abstract COMBUSTION GASSES FROM FUEL-BURNING FURNACES ARE TREATED TO SEPARATE SOLID PARTICLES SUCH AS FLY ASH AND TO OXIDIZE THE SULFUR DIOXIDE GAS (SO2) CONTAINED THEREIN TO SULFUR TRIOXIDE (SO3). THE SO3 IS REACTED WITH EXCESS LIME (CAO) TO FORM CALCIUM SULFATE (CASO4). THE CASO4, UNSPENT LIME PARTICLES, SOME OF WHICH HAVE CRACKED OUTER SHELLS OF CASO4, AND COLLECTED FLY ASH ARE PACKAGED DRY AND USED IN APPROPRIATELY BLENDED FORM TOGETHER WITH CEMENT AND SAND, GRAVEL, OR ROCK TO FROM CONSTRUCTION MATERIALS, THE AVERAGE PERCENTAGE OF CASO4 THEREIN BEING REGULATED TO CONTROL THE SETTING TIME OF THE CEMENT. THE PROPORTION OF THE EXCESS LIME IS AUTOMATICALLY REGULATED BY PROCESS-CONTROL DEVICES WHICH CONTINUOUSLY MONITOR AND CONTROL THE REACTION APPLYING THE PARAMETERS OF FUEL COMPOSITIONS, AND SULFUR OXIDE LEVEL IN THE COMBUSTION GASSES.
Inventors
- 👤 P Lin
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |