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APPARATUS AND METHOD FOR COOLING KILN EXHAUST GASES IN A KILN BYPASS
Described is an apparatus (5) as well as a method for cooling kiln exhaust gases in a kiln bypass (7), which apparatus comprises a mixing chamber (9) for extracting and cooling a portion of the kiln exhaust gases from a kiln system (1, 3), said mixing chamber (9) comprising a tubular housing being provided at one end with an exhaust gas inlet (11) for kiln exhaust gases and provided at its other end with an outlet (13) for cooled exhaust gases, said mixing chamber (9) further comprising a tangential inlet (15) for cooling gases, where the apparatus also comprises a first fan (17) for supplying cooling gases to the mixing chamber (9) and a second fan (19) for drawing the kiln exhaust gases through the kiln bypass (7). The apparatus (5) and the method is peculiar in comprising means (31, 33) for measuring, respectively, the mass flow m A and the flow velocity v A of the cooling gases which are introduced to the mixing chamber (9), and the mass flow m B and the flow velocity v B of the cooled exhaust gases being discharged from the mixing chamber (9), a calculating unit (35) to determine on the basis of the measured values m A, v A, m B and v B the actual mass flow m C and the flow velocity v C for the kiln exhaust gases being drawn through the kiln bypass (7) and to compare the actual mass flow m C with a predetermined value for kiln exhaust gases targeted for being drawn through the kiln bypass (7), a calculating unit (35) to determine on the basis of the values m A, v A, m C and v C the actual swirl number S of the gases in the mixing chamber (9) and to compare this with a predetermined, desired value for the swirl number of the gases in the mixing chamber (9), and means (37, 39, 41) for regulating respectively the fan (17) for feeding cooling gases to the mixing chamber (9), the fan (19) for drawing the kiln exhaust gases through the kiln bypass (7) and the pressure loss across the apparatus (5) when .DELTA.m C or .DELTA.S deviates from 0. It is hereby obtained that, even subject to major variations in operating conditions, the quantity of kiln exhaust gases being drawn through the kiln bypass can be kept essentially constant while simultaneously ensuring sufficient cooling of the kiln exhaust gases in the mixing chamber, thereby preventing coatings from being formed in the mixing chamber per se as well as at its outlet and preventing entry of cooling gases into the kiln system as false air.
APPARATUS AND METHOD FOR COOLING KILN EXHAUST GASES IN A KILN BYPASS
Described is an apparatus (5) as well as a method for cooling kiln exhaust gases in a kiln bypass (7), which apparatus comprises a mixing chamber (9) for extracting and cooling a portion of the kiln exhaust gases from a kiln system (1, 3), said mixing chamber (9) comprising a tubular housing being provided at one end with an exhaust gas inlet (11) for kiln exhaust gases and provided at its other end with an outlet (13) for cooled exhaust gases, said mixing chamber (9) further comprising a tangential inlet (15) for cooling gases, where the apparatus also comprises a first fan (17) for supplying cooling gases to the mixing chamber (9) and a second fan (19) for drawing the kiln exhaust gases through the kiln bypass (7). The apparatus (5) and the method is peculiar in comprising means (31, 33) for measuring, respectively, the mass flow m A and the flow velocity v A of the cooling gases which are introduced to the mixing chamber (9), and the mass flow m B and the flow velocity v B of the cooled exhaust gases being discharged from the mixing chamber (9), a calculating unit (35) to determine on the basis of the measured values m A, v A, m B and v B the actual mass flow m C and the flow velocity v C for the kiln exhaust gases being drawn through the kiln bypass (7) and to compare the actual mass flow m C with a predetermined value for kiln exhaust gases targeted for being drawn through the kiln bypass (7), a calculating unit (35) to determine on the basis of the values m A, v A, m C and v C the actual swirl number S of the gases in the mixing chamber (9) and to compare this with a predetermined, desired value for the swirl number of the gases in the mixing chamber (9), and means (37, 39, 41) for regulating respectively the fan (17) for feeding cooling gases to the mixing chamber (9), the fan (19) for drawing the kiln exhaust gases through the kiln bypass (7) and the pressure loss across the apparatus (5) when .DELTA.m C or .DELTA.S deviates from 0. It is hereby obtained that, even subject to major variations in operating conditions, the quantity of kiln exhaust gases being drawn through the kiln bypass can be kept essentially constant while simultaneously ensuring sufficient cooling of the kiln exhaust gases in the mixing chamber, thereby preventing coatings from being formed in the mixing chamber per se as well as at its outlet and preventing entry of cooling gases into the kiln system as false air.
APPARATUS AND METHOD FOR COOLING KILN EXHAUST GASES IN A KILN BYPASS
APPAREIL ET PROCEDE DE REFROIDISSEMENT DE GAZ D'ECHAPPEMENT DE FOUR DANS UNE DERIVATION DE FOUR
HUNDEBOEL SOEREN (author)
2015-06-30
Patent
Electronic Resource
English
IPC:
F27B
Industrieöfen, Schachtöfen, Brennöfen, Retorten allgemein
,
FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL
/
C04B
Kalk
,
LIME
/
F27D
Einzelheiten oder Zubehör für Industrieöfen, Schachtöfen, Brennöfen oder Retorten, soweit sie nicht auf eine Ofenart eingeschränkt sind
,
DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
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