Abstract In a continuously operating, vertical calcining kiln in which substantially complete calcining is obtained by preheating supply materials with exhaust gases, and co-current, combustion supporting fluid at an elevated temperature is supplied to a combustion zone above the calcining chamber and counter-current combustion supporting fluid is supplied beneath the calcining zone, a heat exchanger in communication with the exhaust air drawn through the calcining zone for effecting counter-current heating of atmospheric air as it is pumped through and heated in the exchanger, with minimum contaminates, whereby the available static pressure is improved at the combustion zone permitting more efficient production quantitatively as well as cooleroperation and maintenance-free air pumps operating more efficiently at lower temperatures.
Inventors
👤 M Parsons
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-01 19:52
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
The process as claimed in claim 1 including the steps of introducing said exhausted gases and said second source of combustion-supporting fluid through a heat exchanger.
Claim 2
Dependent Claim
41 words
The process as claimed in claim 1 removing the exhaust gases at substantially terminal calcining temperature and introducing said second source of combustion-supporting fluid at substantially approximately atmospheric temperature and recovering at least 50% of the BTUs from said exhausted gas.
Claim 3
Dependent Claim
51 words
The process as claimed in claim 1 including using dual, independent fluid pumps for respectively exhausting said exhaust gases and introducing said second source of combustion supporting fluid and burning the fuel in the fuel combustion zone in relation to air being supplied by said second source of combustion supporting fluid.
Claim 4
Independent Claim
180 words
The system for continuously calcining materials comprising, in combination: vertically-disposed kiln means; supply means communicating with said kiln means for charging said kiln means with material to be calcined; said kiln means comprising, in series, preheat chamber means, restricted passage means, calcining chamber means, and cooling chamber means, said kiln means including downwardly directed burner means adjacent the upper end of said calcining chamber means and forming a combustion chamber at the upper portion of said calcining chamber means, said calcining chamber means including one outlet port means for directing heated gases to said preheat chamber means, a second outlet port means communicating generally below said calcining chamber means for drawing a combustion-supporting fluid countercurrent into said calcining chamber; heat exchanger means in communication with said second outlet port means of said calcining chamber and said combustion chamber for withdrawing exhaust gases from the calcining chamber and preheating from atmospheric temperature a combustion-supporting fluid directed to said combustion chamber, and pump means operatively connected to said heat exchanger means for effecting the exhausting of gases and introduction of combustion-supporting air.
Claim 5
Dependent Claim
50 words
The system as claimed in claim 5 in which said pump means comprises separate pumps, one pump drawing exhaust gases through said heat exchanger, and said other pump communicating with the atmosphere and driving air under pressure through said heat exchanger to be heated by conduction by the exhaust gases.