US3871846A — Dust filter arrangement

Claim 1

Independent Claim 347 words

A filter arrangement for separating suspended solid particles from a raw gas comprising, in combination: a. two groups of filter chambers arranged in respective rows; b. a horizontally extending wall vertically separating a first compartment from a second compartment in each chamber, 1. said wall being permeable to gas flowing between said compartments while retaining solid particles suspended in said gas when the gas flows from said second compartment toward said first compartment through said wall, 2. said wall including a foraminous support member and a filter bed of granular material supported on said member; c. a purified gas manifold permanently communicating with eaCh of said first compartments; d. a single branch conduit leading out of each of said second compartments; e. a raw gas intake including a manifold portion interposed between said rows, 1. each branch conduit having an end portion remote from the associated second compartment and located below said manifold portion; f. scavenging gas discharge means including two scavenging gas conduits located below said end portions; g. valve means associated with each of said branch conduits for alternatively connecting the associated branch conduit with said raw gas intake and said scavenging gas discharge means, 1. said valve means being arranged in two rows, each valve means being operatively interposed between the end portion of the associated branch conduit, said manifold portion, and one of said scavenging conduits; h. centrifugal separator means in said intake for removing suspended coarse particles from the raw gas before said raw gas is admitted to said filter chambers; i. separating means connected to said scavenging gas discharge means for separating solid particles from scavenging gas flowing outward of said second compartments through said discharge means; j. a circulating fan having a suction port connected to said separating means and a pressure port connected to said raw gas intake ahead of said centrifugal separator means; and k. an exhaust fan connected to said purified gas manifold for drawing raw gas and scavenging gas separated from solid particles into said centrifugal separator means and for discharging purified gas from said manifold.

Claim 2

Dependent Claim 347 words

A filter arrangement for separating suspended solid particles from a raw gas comprising, in combination: a. two groups of filter chambers arranged in respective rows; b. a horizontally extending wall vertically separating a first compartment from a second compartment in each chamber, 1. said wall being permeable to gas flowing between said compartments while retaining solid particles suspended in said gas when the gas flows from said second compartment toward said first compartment through said wall, 2. said wall including a foraminous support member and a filter bed of granular material supported on said member; c. a purified gas manifold permanently communicating with eaCh of said first compartments; d. a single branch conduit leading out of each of said second compartments; e. a raw gas intake including a manifold portion interposed between said rows, 1. each branch conduit having an end portion remote from the associated second compartment and located below said manifold portion; f. scavenging gas discharge means including two scavenging gas conduits located below said end portions; g. valve means associated with each of said branch conduits for alternatively connecting the associated branch conduit with said raw gas intake and said scavenging gas discharge means, 1. said valve means being arranged in two rows, each valve means being operatively interposed between the end portion of the associated branch conduit, said manifold portion, and one of said scavenging conduits; h. centrifugal separator means in said intake for removing suspended coarse particles from the raw gas before said raw gas is admitted to said filter chambers; i. separating means connected to said scavenging gas discharge means for separating solid particles from scavenging gas flowing outward of said second compartments through said discharge means; j. a circulating fan having a suction port connected to said separating means and a pressure port connected to said raw gas intake ahead of said centrifugal separator means; and k. an exhaust fan connected to said purified gas manifold for drawing raw gas and scavenging gas separated from solid particles into said centrifugal separator means and for discharging purified gas from said manifold.

Claim 3

Dependent Claim 57 words

said wall including a foraminous support member and a filter bed of granular material supported on said member; c. a purified gas manifold permanently communicating with eaCh of said first compartments; d. a single branch conduit leading out of each of said second compartments; e. a raw gas intake including a manifold portion interposed between said rows,

Claim 4

Dependent Claim 57 words

said wall including a foraminous support member and a filter bed of granular material supported on said member; c. a purified gas manifold permanently communicating with eaCh of said first compartments; d. a single branch conduit leading out of each of said second compartments; e. a raw gas intake including a manifold portion interposed between said rows,

Claim 5

Dependent Claim 22 words

An arrangement as set forth in claim 1, wherein said exhaust fan means has a suction port directly connected to said manifold.

Claim 6

Dependent Claim 88 words

An arrangement as set forth in claim 1, wherein each valve means includes a first valve seat interposed between the associated branch conduit and said manifold portion and a second valve seat interposed between said associated branch conduit and one of said scavenging conduits, a valve member, and actuator means for moving said valve member between two positions of sealing engagement with said valve seats respectively, said actuating means including a rod member passing through said one scavenging conduit in sealing engagement and fastened to said valve member.

Claim 7

Dependent Claim 104 words

An arrangement as set forth in claim 1, wherein the particle size of said granular material is between 1.5 and 5 millimeters, the height of said filter bed is between 100 and 200 millimeters, the particles of said granular material have a roughness between 10 and 50 percent of the size thereof, and each filter bed has a filtering capacity of at least 1.5 kg of said suspended solid particles per hour and square meter of said bed in a horizontal plane at a gas flow of 1,000 to 3,000 cubic meters per hour and square meter of said bed in said horizontal plane.

Claim 8

Dependent Claim 41 words

An arrangement as set forth in claim 4, wherein said circulating fan means and said exhaust fan means jointly include means for making the velocity of impact of said gas on said filter bed between 0.55 and 0.85 meters per second.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-03-17	1978-09-16	1979-03-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-03-17	1982-09-16	1983-03-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-03-17	1986-09-16	1987-03-18	$7700.00	Window Closed / Lapsed

Dust filter arrangement

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