US4171091A
Expired / Lapsed
US
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Process and device for spraying liquid
Assignee: DSM BV
•
Filing: 1978-06-01
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Granted: 1979-10-16
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Expires: 1998-06-01
Abstract
Abstract A two phase sprayer and process are disclosed in which the sprayer has a liquid supply tube surrounded by a coaxial gas or gas mixture supply tube which extends beyond the length of the liquid supply tube where the gas flow surrounds and atomizes the expelled liquid. The sprayer has a unique structure in part characterized by a narrowed taper gas supply tube which converges towards the outlet at an angle of 70 DEG -90 DEG with respect to the sprayer axis. The internally-positioned, coaxial liquid supply tube is chamfered also at a similar 70 DEG -90 DEG angle, the gas and liquid tubes at their outlet being essentially parallel.
Inventors
- 👤 Rudolf van Hardeveld
- 👤 Petrus F. A. M. Hendriks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:44
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/02; B05B7/06; B05B7/062; B05B7/066
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
320 words
In a process for spraying a liquid by means of a two-phase sprayer using an atomizing gas wherein said sprayer is comprised of a liquid feed tube adapted for the supply of a liquid to be sprayed, terminating with a liquid outflow opening and positioned around the axis of the sprayer and coaxially with a gas feed tube adapted for the supply of atomizing gas and terminating with a sprayer outflow opening, said liquid and gas feed tubes being relatively positioned such that said gas feed tube extends beyond the liquid outflow opening of said liquid feed tube, the improvement wherein, in said sprayer, said gas feed tube near the sprayer outflow opening has an inner wall section that tapers narrower towards the sprayer outflow opening, at an angle α of between 70° and 90° with respect to the sprayer axis, and continues by way of a rounded shoulder into a comparatively short outflow channel ending at said sprayer outflow opening, said rounded shoulder having a radius of between 0.1 and 0.4 times the smallest diameter of said outflow channel, said liquid feed tube has an outer wall, and an end face between said outer wall and liquid outflow opening chamfered at an angle α' of between 70° and 90° with respect to the sprayer axis thereby forming a conical channel with an average apex of between 140° and 180° between said chamfered end face and the tapered inner wall section of the gas feed tube, and further wherein the passage area of the conical channel at the end adjacent to said outflow channel is no greater than such passage area at any other place within said conical channel, the smallest passage area of said outflow channel is no greater than the smallest passage area of said conical channel, and the smallest diameter of the outflow channel is between 1.0 and 1.6 times the diameter of the liquid outflow opening.
Claim 2
Dependent Claim
320 words
In a process for spraying a liquid by means of a two-phase sprayer using an atomizing gas wherein said sprayer is comprised of a liquid feed tube adapted for the supply of a liquid to be sprayed, terminating with a liquid outflow opening and positioned around the axis of the sprayer and coaxially with a gas feed tube adapted for the supply of atomizing gas and terminating with a sprayer outflow opening, said liquid and gas feed tubes being relatively positioned such that said gas feed tube extends beyond the liquid outflow opening of said liquid feed tube, the improvement wherein, in said sprayer, said gas feed tube near the sprayer outflow opening has an inner wall section that tapers narrower towards the sprayer outflow opening, at an angle α of between 70° and 90° with respect to the sprayer axis, and continues by way of a rounded shoulder into a comparatively short outflow channel ending at said sprayer outflow opening, said rounded shoulder having a radius of between 0.1 and 0.4 times the smallest diameter of said outflow channel, said liquid feed tube has an outer wall, and an end face between said outer wall and liquid outflow opening chamfered at an angle α' of between 70° and 90° with respect to the sprayer axis thereby forming a conical channel with an average apex of between 140° and 180° between said chamfered end face and the tapered inner wall section of the gas feed tube, and further wherein the passage area of the conical channel at the end adjacent to said outflow channel is no greater than such passage area at any other place within said conical channel, the smallest passage area of said outflow channel is no greater than the smallest passage area of said conical channel, and the smallest diameter of the outflow channel is between 1.0 and 1.6 times the diameter of the liquid outflow opening.
Claim 3
Dependent Claim
21 words
The process according to claim 1 wherein the difference in size between the angles α and α' is at most 5°.
Claim 4
Dependent Claim
27 words
The process according to claim 2 wherein the angles α and α' are substantially or completely equal and the conical channel thus defined has substantially parallel walls.
Claim 5
Dependent Claim
22 words
The process according to claim 1 wherein each of the angles α and α' has a size of between 75° and 87.5°.
Claim 6
Dependent Claim
22 words
The process according to claim 4 wherein each of the angles α and α' has a size of between 77.5° and 82.5°.
Claim 7
Dependent Claim
27 words
The process according to claim 1 wherein the smallest diameter of the outflow channel is between 1.1 and 1.3 times the diameter of the liquid outflow opening.
Claim 8
Dependent Claim
25 words
The process according to claim 1 wherein the radius of said rounded shoulder is 0.2 to 0.3 times the smallest diameter of the outflow channel.
Claim 9
Dependent Claim
44 words
The process according to claim 1 wherein the edge formed by the chamfered end face of the liquid feed tube and the outer wall of said tube is rounded having a radius that suppresses or prevents the formation of turbulence in the gas flow.
Claim 10
Dependent Claim
26 words
The process according to claim 1 wherein the smallest passage area of the outflow channel is smaller than the smallest passage area of the conical channel.
Claim 11
Dependent Claim
141 words
The process of claim 1 wherein said liquid is fed to the sprayer at a rate so as to pass through said liquid outflow opening at a velocity of between 10 and 200 centimeters per second, said atomizing gas is fed to the sprayer at a rate such that the gas flow passing through said conical channel is at most slightly turbulent, and the weight ratio of atomizing gas to liquid fed to said sprayer is between 0.1 and 1.0, and wherein said atomizing gas leaving said conical channel surrounds and impinges upon said liquid passing through said liquid outflow opening at an angle between the direction of gas flow and the direction of liquid flow of between 70° and 90° whereby said liquid is atomized and the resulting gas-liquid mixture is passed out of said sprayer via the outflow channel.
Claim 12
Dependent Claim
24 words
The process according to claim 10 wherein the atomizing gas flow impinges upon the liquid flow at an angle of between 75° and 87.5°.
Claim 13
Dependent Claim
24 words
The process according to claim 11 wherein the atomizing gas flow impinges upon the liquid flow at an angle of between 77.5° and 82.5°.
Claim 14
Dependent Claim
27 words
The process according to claim 10 wherein the smallest diameter of the outflow channel is between 1.1 and 1.3 times the diameter of the liquid outflow opening.
Claim 15
Dependent Claim
40 words
The process according to claim 10 wherein the turbulence in the outflowing gas-liquid mixture is reduced by passing said gas-liquid mixture over said rounded shoulder having a radius of 0.2 and 0.3 times the smallest diameter of the outflow channel.
Claim 16
Dependent Claim
47 words
The process according to claim 10 wherein the turbulence in the gas flowing through the conical channel is reduced by passing said gas over a rounding at the edge formed by the outer wall of the liquid supply tube and the chamfered end face of this tube.
Claim 17
Dependent Claim
41 words
The process according to claim 10 wherein the atomized liquid is sprayed directly into a fluidized bed of solid particles with a gas outflow velocity through the sprayer outflow opening of between 20 meters per second and 120 meters per second.
Claim 18
Dependent Claim
22 words
The process according to claim 16 wherein the gas outflow velocity ranges between 40 meters per second and 100 meters per second.
Claim 19
Dependent Claim
298 words
In a two-phase sprayer having a liquid feed tube adapted for the supply of a liquid to be sprayed, terminating with a liquid outflow opening and positioned around the axis of the sprayer and coaxially within a gas feed tube adapted for the supply of atomizing gas and terminating with a sprayer outflow opening, said liquid and gas feed tubes being relatively positioned such that said gas feed tube extends beyond the liquid outflow opening of said liquid feed tube, the improvement comprising: said gas feed tube near the sprayer outflow opening having an inner wall section that tapers narrower towards the sprayer outflow opening, at an angle α of between 70° and 90° with respect to the sprayer axis, and continuing by way of a rounded shoulder into a comparatively short outflow channel ending at said sprayer outflow opening, said rounded shoulder having a radius of between 0.1 and 0.4 times the smallest diameter of said outflow channel, said liquid feed tube havng an outer wall, and an end face between said outer wall and liquid outflow opening chamfered at an angle α' of between 70° and 90° with respect to the sprayer axis, forming a conical channel with an average apex of between 140° and 180° between said chamfered end face and the tapered inner wall section of the gas feed tube, and further wherein the passage area of the conical channel at the end adjacent to said outflow channel is no greater than such passage area at any other place within said conical channel, the smallest passage area of said outflow channel is no greater than the smallest passage area of said conical channel, and the smallest diameter of the outflow channel is between 1.0 and 1.6 times the diameter of the liquid outflow opening.
Claim 20
Dependent Claim
298 words
In a two-phase sprayer having a liquid feed tube adapted for the supply of a liquid to be sprayed, terminating with a liquid outflow opening and positioned around the axis of the sprayer and coaxially within a gas feed tube adapted for the supply of atomizing gas and terminating with a sprayer outflow opening, said liquid and gas feed tubes being relatively positioned such that said gas feed tube extends beyond the liquid outflow opening of said liquid feed tube, the improvement comprising: said gas feed tube near the sprayer outflow opening having an inner wall section that tapers narrower towards the sprayer outflow opening, at an angle α of between 70° and 90° with respect to the sprayer axis, and continuing by way of a rounded shoulder into a comparatively short outflow channel ending at said sprayer outflow opening, said rounded shoulder having a radius of between 0.1 and 0.4 times the smallest diameter of said outflow channel, said liquid feed tube havng an outer wall, and an end face between said outer wall and liquid outflow opening chamfered at an angle α' of between 70° and 90° with respect to the sprayer axis, forming a conical channel with an average apex of between 140° and 180° between said chamfered end face and the tapered inner wall section of the gas feed tube, and further wherein the passage area of the conical channel at the end adjacent to said outflow channel is no greater than such passage area at any other place within said conical channel, the smallest passage area of said outflow channel is no greater than the smallest passage area of said conical channel, and the smallest diameter of the outflow channel is between 1.0 and 1.6 times the diameter of the liquid outflow opening.
Claim 21
Dependent Claim
21 words
The two-phase sprayer of claim 18 wherein the difference in size between the angles α and α' is at most 5°.
Claim 22
Dependent Claim
27 words
The two-phase sprayer of claim 19 wherein the angles α and α' are substantially or completely equal and the conical channel thus defined has substantially parallel walls.
Claim 23
Dependent Claim
22 words
The two-phase sprayer of claim 18 wherein each of the angles α and α' has a size of between 75° and 87.5°.
Claim 24
Dependent Claim
22 words
The two-phase sprayer of claim 21 wherein each of the angles α and α' has a size of between 77.5° and 82.5°.
Claim 25
Dependent Claim
27 words
The two-phase sprayer of claim 18 wherein the smallest diameter of the outflow channel is between 1.1 and 1.3 times the diameter of the liquid outflow opening.
Claim 26
Dependent Claim
25 words
The two-phase sprayer of claim 18 wherein the radius of said rounded shoulder is 0.2 to 0.3 times the smallest diameter of the outflow channel.
Claim 27
Dependent Claim
44 words
The two-phase sprayer of claim 18 wherein the edge formed by the chamfered end face of the liquid feed tube and the outer wall of said tube is rounded having a radius that suppresses or prevents the formation of turbulence in the gas flow.
Claim 28
Dependent Claim
26 words
The two-phase sprayer of claim 20 wherein the smallest passage area of the outflow channel is smaller than the smallest passage area of the conical channel.
References Cited (Backward Citations)
US3727839A
Cited
US3831843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |