Apparatus and method for improved pulse-jet cleaning of industrial filters

A pulse pipe for use in pulse-jet cleaning of filter bags disposed in a baghouse in a pre-determined arrangement, said pulse pipe comprising

• a cylindrical, hollow inner tube and a cylindrical, hollow outer tube with said inner tube arranged coaxially within said outer tube, said inner tube and said outer tube being configured for relative rotation therebetween about a common longitudinal axis, said inner tube and said outer tube each having a series of apertures formed therein,
• wherein one of said inner tube and said outer tube constitutes a first tube and the other of said inner tube and said outer tube constitutes a second tube, and
• wherein a) the apertures in said first tube are positioned to correspond to the pre-determined arrangement of the filter bags in the baghouse;
• and b) the apertures in said second tube are positioned such that as said second tube rotates relative to said first tube, different subsets of the apertures in said second tube intermittently come into alignment with the various apertures in said first tube and allow gas supplied to the interior of said inner tube to pass out of said pulse pipe,
• wherein said first tube is said inner tube and said second tube is said outer tube.

A pulse pipe for use in pulse-jet cleaning of filter bags disposed in a baghouse in a pre-determined arrangement, said pulse pipe comprising

• a cylindrical, hollow inner tube and a cylindrical, hollow outer tube with said inner tube arranged coaxially within said outer tube, said inner tube and said outer tube being configured for relative rotation therebetween about a common longitudinal axis, said inner tube and said outer tube each having a series of apertures formed therein,
• wherein one of said inner tube and said outer tube constitutes a first tube and the other of said inner tube and said outer tube constitutes a second tube, and
• wherein a) the apertures in said first tube are positioned to correspond to the pre-determined arrangement of the filter bags in the baghouse;
• and b) the apertures in said second tube are positioned such that as said second tube rotates relative to said first tube, different subsets of the apertures in said second tube intermittently come into alignment with the various apertures in said first tube and allow gas supplied to the interior of said inner tube to pass out of said pulse pipe;
• further comprising means for determining relative angular position between said first and second tubes.

A filter bag baghouse assembly, comprising a chamber having an inlet portion and an outlet portion with a plurality of sleeve-type or tubular filter bags disposed therein in a pre-determined arrangement, the filter bags having closed ends disposed toward the inlet portion of said chamber and open ends disposed toward the outlet portion of said chamber, and

• a plurality of pulse pipes disposed near the open ends of the filter bags,
• wherein each of said pulse pipes comprises
• a cylindrical, hollow inner tube and a cylindrical, hollow outer tube with said inner tube arranged coaxially within said outer tube, said inner tube and said outer tube being configured for relative rotation therebetween about a common longitudinal axis, said inner tube and said outer tube each having a series of longitudinally spaced apertures formed therein,
• wherein one of said inner tube and said outer tube constitutes a first tube and the other of said inner tube and said outer tube constitutes a second tube, and
• wherein a) the apertures in said first tube are positioned to correspond to the pre-determined arrangement of the filter bags in the baghouse;
• and b) the apertures in said second tube are positioned such that as said second tube rotates relative to said first tube, different subsets of the apertures in said second tube intermittently come into alignment with the various apertures in said first tube and allow gas supplied to the interior of said inner tube to pass out of said pulse pipe.

A method of pulse-jet cleaning filter bags disposed in a rectangular array in a filter bag baghouse, said rectangular array comprising rows and columns of filter bags, said method comprising intermittently injecting a low-pressure/high-volume flow of gas into varying subsets of the filter bags in each row or each column in said array, the subsets each comprising less than all of the filter bags in each row or each column, respectively,

• wherein a pulse pipe is provided near each of the rows or each of the columns of filter bags in the array, each pulse pipe comprising
• a cylindrical, hollow inner tube and a cylindrical, hollow outer tube with said inner tube arranged coaxially within said outer tube, said inner tube and said outer tube being configured for relative rotation therebetween about a common longitudinal axis, said inner tube and said outer tube each having a series of longitudinally spaced apertures formed therein,
• wherein one of said inner tube and said outer tube constitutes a first tube and the other of said inner tube and said outer tube constitutes a second tube, and
• wherein a) the apertures in said first tube are positioned to correspond to the arrangement of the filter bags in the row or column near which the pulse pipe is provided;
• and b) the apertures in said second tube are positioned such that as said second tube are positioned such that as second tube rotates relative to said first tube, different subsets of the apertures in said second tube intermittently come into alignment with the various apertures in said first tube and allow gas supplied to the interior of said inner tube to pass out of said pulse pipe;
• said method comprising causing gas to flow into said inner tube, and
• injecting said gas intermittently into said varying subsets of the filter bags in each row or each column in the array by causing said second tube to rotate relative to said first tube.