US4764254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Falling film liquor heater having a screen to prevent clogging of a liquid distributing tray
Assignee: Rosenblad Corp
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Filing: 1987-05-21
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Granted: 1988-08-16
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Expires: 2007-05-21
Abstract
Abstract In a falling film exchanger, a screen arrangement for preventing solid particles in the liquid to be heated from plugging liquid distribution outlets of a perforated liquid distributing tray or reaching the heating surface of the heat exchanger.
Inventors
- 👤 Axel E. Rosenblad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:28
CPC Classifications
F; F28; F28D; F28D3/00; F28D3/04; B; B01; B01D; B01D1/00; B01D1/22; B01D3/00; B01D3/008; D; D21; D21C; D21C7/00; D21C7/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
In a falling film heat exchanger of the type having a heated surface for the indirect exchange of heat beetween a vapor and a liquid which flows as a falling film down said heating surface, and having a liquid distributor with openings for distributing liquid to be heated to the heating surface, a screen between a liquid inlet and said liquid distributor for preventing passage to the distributor of solid particles which could plug the openings of said liquid distributor said screen having sides which slope downwardly and outwardly from an apex positioned beneath said liquid inlet for deflecting such solid particles.
Claim 2
Dependent Claim
102 words
In a falling film heat exchanger of the type having a heated surface for the indirect exchange of heat beetween a vapor and a liquid which flows as a falling film down said heating surface, and having a liquid distributor with openings for distributing liquid to be heated to the heating surface, a screen between a liquid inlet and said liquid distributor for preventing passage to the distributor of solid particles which could plug the openings of said liquid distributor said screen having sides which slope downwardly and outwardly from an apex positioned beneath said liquid inlet for deflecting such solid particles.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 in which said sloping screen is generally conical in form.
Claim 4
Dependent Claim
34 words
The apparatus of claim 1 in which said screen is formed of a coil of wire with passages between adjacent coils of said wire which are narrower than the openings of said liquid distributor.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein said screen slopes at an angle of about 60 degrees from the horizontal.
Claim 6
Dependent Claim
83 words
A plate type falling film heat exchanger having a plurality of generally parallel vertical plate heat exchange elements and a liquid distributing tray with perforations arranged above tops of said plate heat exchange elements for providing an even distribution of liquid thereto, and a screen with downwardly and outwardly sloping sides with an apex positioned beneath and pointed toward an inlet for the liquid to prevent plugging of said perforations by screening out solid particles from liquid being fed to said distributing tray.
Claim 7
Dependent Claim
83 words
A plate type falling film heat exchanger having a plurality of generally parallel vertical plate heat exchange elements and a liquid distributing tray with perforations arranged above tops of said plate heat exchange elements for providing an even distribution of liquid thereto, and a screen with downwardly and outwardly sloping sides with an apex positioned beneath and pointed toward an inlet for the liquid to prevent plugging of said perforations by screening out solid particles from liquid being fed to said distributing tray.
Claim 8
Dependent Claim
14 words
The heat exchanger of claim 5, wherein said sloping screen is conical in form.
Claim 9
Dependent Claim
35 words
The heat exchanger of claim 5 wherein said screen is formed of a coil of wire with passages between the wires of said coil which are smaller than the perforations of said liquid distributing tray.
Claim 10
Dependent Claim
21 words
The heat exchanger of claim 5 and including means for discharging solid particles along with heated liquid from the heat exchanger.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |