초록 ▼

A method and apparatus are disclosed for cleaning filter elements, such as filter bags in a plurality of baghouses and for predicting the useful life of such filter elements in individual baghouses. The volumetric flow rate of air from each baghouse is continually calculated using actual impact and

A method and apparatus are disclosed for cleaning filter elements, such as filter bags in a plurality of baghouses and for predicting the useful life of such filter elements in individual baghouses. The volumetric flow rate of air from each baghouse is continually calculated using actual impact and static pressure measurements and compared with a flow rate set point. The set point is continually adjusted for density correction based on the actual air stream temperature. The bags are pulsed for cleaning when the flow rate is less than the adjusted set point. Pulsing is then halted when the flow rate reaches or exceeds the adjusted set point. Total daily cleaning times are accumulated over time and graphically displayed to indicate when a critical level is reached indicating that filter bag change out is needed. Each baghouse is monitored in this manner to reflect the unique operating conditions of each baghouse.

대표청구항 ▼

[ I claim:] [1.] Apparatus for cleaning filter elements in a plurality of parallel ducted modules wherein each module contains a plurality of filter elements, each of said modules having pulse means to dislodge accumulated particulate matter from the filter elements when said means is activated, sai

[ I claim:] [1.] Apparatus for cleaning filter elements in a plurality of parallel ducted modules wherein each module contains a plurality of filter elements, each of said modules having pulse means to dislodge accumulated particulate matter from the filter elements when said means is activated, said apparatus comprising:means for measuring an impact pressure and a static pressure of a gas stream flowing from each module;means for transmitting said impact pressure and static pressure measurements to a computer means for calculating an actual volumetric flow rate of gas flowing from each module and for comparing said actual volumetric flow rate with a flow rate set point; andmeans for signaling the pulse means of each module to activate said pulse means for a given module when the calculated flow rate for the given module is below said set point and for deactivating said pulse means when said calculated flow rate for the given module is at least equal to said set point. [9.] A method for cleaning filter elements in a plurality of parallel ducted modules housing a plurality of filter elements, each of said modules having cleaning means to dislodge accumulated particulate matter from the filter elements when the cleaning means is selectively activated, the method comprising the steps of:a) measuring an impact pressure and a static pressure in a gas stream being discharged from each module;b) calculating an actual volumetric flow rate of said gas stream from each module;c) measuring a temperature of said gas stream and calculating a density factor for said gas stream based on said measured temperature;d) calculating an adjusted flow rate set point based upon said density factor;e) comparing said actual volumetric flow rate from each module and said adjusted set point;f) activating the cleaning means for a given module when the actual volumetric flow rate is less than the adjusted set point for said given module; andg) deactivating the cleaning means when the volumetric flow rate for the given module is at least equal to the adjusted set point. The method of claim 9 further including the steps of:accumulating a total daily time said cleaning means is in an activated condition for each module; andpredicting an end of the useful life of the filter elements in each module when the accumulated daily cleaning time for each module exceeds a predetermined level. The method of claim 10 wherein said predetermined critical level is about 70% of a 24-hour daily operating period. The method of claim 9 wherein the cleaning means is one selected from the group consisting of a pulsed compressed air system, a mechanical shaker system and a mechanical rapper system. A method of cleaning filter bags and for predicting the useful life of such filter bags in a plurality of parallel ducted baghouses, each of said baghouses having pulse means for selectively delivering bursts of compressed air to clean particulate matter from the filter bags, the method comprising the steps of:a) measuring an impact pressure and a static pressure in a gas stream being discharged from each baghouse;b) calculating a volumetric flow rate of said gas stream;c) measuring a temperature of said gas stream and a density factor for said gas stream based on said measured temperature;d) calculating an adjusted flow rate set point based upon said density factor;e) comparing said volumetric flow rate and said adjusted set point;f) activating the cleaning means when the volumetric flow rate is less than the adjusted set point;g) deactivating the cleaning means when the volumetric flow rate is at least equal to the adjusted set point;h) accumulating a total daily time said cleaning means is in an activated mode for each baghouse; andi) predicting an end of the useful life of the filter bags in each baghouse when an accumulated daily cleaning time exceeds a predetermined level. The method of claim 13 including the step of visually displaying the accumulated daily cleaning time for each baghouse in a graphical form for use in said predicting step. The method of claim 14 including the step of averaging said accumulated daily cleaning times on a weekly basis for use in said visually displayed graph.