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| Title | Combustion Gas Scrubbing Using Free-Jet Technology |
| Creator | Liniger, Dick; Hill, Tim |
| Publisher | Digitized by J. Willard Marriott Library, University of Utah |
| Date | 1991 |
| Spatial Coverage | presented at Honolulu, Hawaii |
| Abstract | Free-Jet scrubbing technology has been successfully used on a variety of combustion processes to control particulate and acid gas emissions. Free-Jet technology differs from conventional venturi technology in the way the scrubbing liquid mixes with the gas stream. In Free-Jet technology, combustion gas is brought through a converging throat, where the velocity is increased, and the gas is allowed to exhaust as a free-jet into an enclosed plenum. Scrubbing liquid is injected onto the perimeter of the gas stream as it exits the throat. As the scrubbing liquid strikes the gas jet it is sheared into fine droplets and turbulently mixed with the gas. These fine water droplets act as impact targets onto which particulates collide and are captured. The technology has been applied to rotary kiln, fluidized bed, and liquid waste combustion processes. Outlet particulate emissions below 0.01 gr/dscf and HCI removal efficiencies above 99% have been demonstrated. |
| Type | Text |
| Format | application/pdf |
| Language | eng |
| Rights | This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee. |
| Conversion Specifications | Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth. |
| Scanning Technician | Cliodhna Davis |
| ARK | ark:/87278/s6h134kx |
| Setname | uu_afrc |
| ID | 7195 |
| Reference URL | https://collections.lib.utah.edu/ark:/87278/s6h134kx |
Page Metadata
| Title | Page 3 |
| Format | application/pdf |
| OCR Text | Assuming a common particle, the major factors which determine collection efficiency are: (1) the relative velocity between the particle and the target and (2) the target diameter. A higher relative velocity provides better collection efficiencies. A smaller droplet diameter results in improved collection efficiencies. The free-jet scrubber is designed to maximize the benefits of these two factors resulting in better collection efficiencies than the conventional wet scrubber. Free-jet Design Free-jet scrubbing has been applied through two design technologies: • Supersonic Free-Jet • Subsonic Free-Jet The supersonic free-jet design (refer to Figure 1) is the original patented design. This design employs an ejector assembly which accelerates a compressible fluid through a nozzle and exhausts it as a free jet The energy input to the system for scrubbing and pumping the gas is provided by the compressible fluid, normally steam. The supersonic steam is ejected and allowed to freely expand into an enlarged cavity in which the combustion gas is flowing at a relatively low velocity. Low pressure water is finely atomized as it is sprayed onto the steam jet. The high velocity jet and the water injection pattern utilized combine to achieve smaller water droplets and higher relative velocities than available from conventional wet scrubbers. By allowing the steam jet to expand freely, a turbulent zone is created where the high velocity water/steam mixture interfaces with the low velocity combustion gas. STEAM OR COMPRESSED AIR +, WATER t WATER INJECTED POLLUTED GAS ... SUPERSONIC EJECTOR NOZZLE Figure 1 - Super-sonic Free-jet 2 TURBULENT MIXING PARTICULATE WEITED AND VAPORS ABSORBED • • |
| Setname | uu_afrc |
| ID | 7188 |
| Reference URL | https://collections.lib.utah.edu/ark:/87278/s6h134kx/7188 |