US3739557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag filter arrangement
Assignee: Alstom Power Inc
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Filing: 1971-12-20
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Granted: 1973-06-19
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Expires: 1991-12-20
Abstract
Abstract A bag filter apparatus that removes entrained particulate matter from a carrier gas stream is disclosed. The bag filter has a novel flow arrangement that provides for a sudden expansion of the carrier gas to thereby lower its velocity and thus reduce its capacity to carry particulate matter while it precludes direct impingement of entrained particulate matter upon the fabric filter bags to reduce abrasion of the fabric. The flow arrangement defined also increases the collecting efficiency of the filter bag by eliminating the re-entrainment of filtered dust in the gas stream after it has been once removed therefrom.
Inventors
- 👤 W Anderson
- 👤 R Renko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:31
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/70; B01D46/71
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
Apparatus for separating particulate matter from a carrier gas compromising a housing, a dust hopper subjacent said housing and attached thereto, an inlet for dust entrained gas at one end of said hopper, an outlet for clean gas adjacent the upper side of said housing, an apertured tube sheet extending across said housing intermediate the inlet and outlet openings to separate the housing into filter and outlet chambers, duct means extending from the inlet end to the opposite end of said hopper to direct dust entrained gas therethrough, filter bags depending from said tube sheet at the sides of said duct means to provide an expansion chamber having a void, an elongate opening in the top of said duct means subjacent said void and adapted to exhaust the dust entrained gas vertically, and cleaning means adapted to remove collected dust particles from the outer surface of said filter bags and drop them to the subjacent collection hopper for removal from said apparatus said duct means having an opening at the bottom thereof to permit heavy particulate matter carried by said gas to fall directly into said hopper.
Claim 2
Dependent Claim
187 words
Apparatus for separating particulate matter from a carrier gas compromising a housing, a dust hopper subjacent said housing and attached thereto, an inlet for dust entrained gas at one end of said hopper, an outlet for clean gas adjacent the upper side of said housing, an apertured tube sheet extending across said housing intermediate the inlet and outlet openings to separate the housing into filter and outlet chambers, duct means extending from the inlet end to the opposite end of said hopper to direct dust entrained gas therethrough, filter bags depending from said tube sheet at the sides of said duct means to provide an expansion chamber having a void, an elongate opening in the top of said duct means subjacent said void and adapted to exhaust the dust entrained gas vertically, and cleaning means adapted to remove collected dust particles from the outer surface of said filter bags and drop them to the subjacent collection hopper for removal from said apparatus said duct means having an opening at the bottom thereof to permit heavy particulate matter carried by said gas to fall directly into said hopper.
Claim 3
Dependent Claim
40 words
Apparatus for separating particulate matter from a gas as defined in claim 1 wherein the duct means extending from inlet to the opposite end of the hopper is cylindrical to preclude the accumulation of particulate matter in said duct means.
Claim 4
Dependent Claim
34 words
Apparatus for separating particulate matter from gas as defined in claim 2 wherein the opening at the bottom of the duct means comprises an elongate slot that permits the movement of particulate matter therethrough.
Claim 5
Dependent Claim
36 words
Apparatus for separating particulate matter from gas as defined in claim 3 wherein the opening along the top of the inlet duct has a greater area than the elongate slot at the bottom of said duct.
Claim 6
Dependent Claim
57 words
Apparatus for separating particulate matter from gas as defined in claim 1 including a perforate grating extending along the opening at the top of said duct means to provide a catwalk giving access to the filter bags of said apparatus and simultaneously restrict flow to establish a pressure differential between the inlet duct and the filter chamber.
References Cited (Backward Citations)
US1743934A
Cited
US3385033A
Cited
US3513638A
Cited
US3499268A
Cited
US3577704A
Cited
US3699750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |