Abstract: An improved method of sequentially cleaning filter elements (14) housed in a plurality of filter chambers (12) collectively forming a fabric filter collection apparatus (10) wherein the cleaning operation is controlled in response to an upper limit of pressure differential across the dust collection apparatus. Whenever the pressure differential across the dust collection apparatus (10) reaches the upper limit value, one of the chambers (12) is isolated, the filter elements (14) housed therein are cleaned, and then the isolated chamber is returned to service. Each of the individual chambers (12) is isolated in sequence and the filter elements therein cleaned with the interval between consecutive isolations and cleanings being the time required for the pressure differential across the dust collection apparatus (10) to again reach the upper limit value of pressure differential.

Abstract: An improved method of cleaning a fabric filter collector (10) housing one or more filter chambers (12) wherein the cleaning operation is monitored to actuate an alarm (54) if the pressure differential across the collector after any particular cleaning operation exceeds the pressure differential across the collector at initiation of that cleaning operation.

Abstract: The invention discloses a method and apparatus for conditioning the gases discharged from a cupola. The apparatus consists of three flow connected vessels comprising first the cupola with improved gas conditioning means therein, secondly, a water spray tower and thirdly, a baghouse dust collector. The improved gas conditioning method and apparatus comprises a movably mounted conduit and nozzle for spraying cooling water through the cupola charge door during the burn-down period of cupola operation when the bed gas is not used to pre-heat the new charges in the cupola. The cooling water is used instead of large quantities of dilution air to temper the discharge gas at this point. Therefore, by the improved method, during burn-down the temperature of the discharged gas can be maintained at slightly above the normal cupola operational temperature without requiring discharge ducts and dust collecion capacity for the additional dilution air.

Abstract: The invention discloses a method and apparatus for conditioning the gases discharged from a cupola. The apparatus consists of three flow connected vessels comprising first the cupola with improved gas conditioning means therein, secondly, a water spray tower and thirdly, a baghouse dust collector. The improved gas conditioning method and apparatus comprises a movably mounted conduit and nozzle for spraying cooling water through the cupola charge door during the burn-down period of cupola operation when the bed gas is not used to pre-heat the new charges in the cupola. The cooling water is used instead of large quantities of dilution air to temper the discharge gas at this point. Therefore, by the improved method, during burn-down the temperature of the discharged gas can be maintained at slightly above the normal cupola operational temperature without requiring discharge ducts and dust collection capacity for the additional dilution air.