Injectors and their use in gassing liquids

• US 4,162,970 A
• Filed: 07/25/1977
• Issued: 07/31/1979
• Est. Priority Date: 07/31/1976
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Zlokarnik, Marko
• Primary Examiner(s): Spitzer, Robert H.
• Application Number:
  US05/818,893
• Time in Patent Office: 736 Days
• Field of Search: 137/604, 210/14, 210/15, 210/60, 210/63 R, 210/194, 210/197, 210/220, 210/221 R, 239/428.5, 239/433, 239/434.5, 261/77, 261/78 A, 261/123, 261/DIG. 75, 366/167, 366/172, 366/173, 417/174
• US Class Current: 210/620
• CPC Class Codes: B01F 23/23 by introducing gases into liquid media, e.g. for producing aerated liquids
• CPC Class Codes: B01F 25/312 with Venturi elements; Details thereof
• CPC Class Codes: B01F 25/31242 the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit B01F25/31243 takes precedence
• CPC Class Codes: B01F 25/312532 Profiled, grooved, ribbed discharge conduit, or being provided with baffles
• CPC Class Codes: C02F 3/1294 "Venturi" aeration means
• CPC Class Codes: C12M 29/06 Nozzles; Sprayers; Spargers; Diffusers per se B01F23/231, B01J19/26
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage
• CPC Class Codes: Y10S 261/75 Flowing liquid aspirates gas

Abstract

In an injector for the dispersion of a gas into a liquid and comprising a gas inlet, a liquid inlet, and a mixing chamber communicating with said inlets and having an inlet and an outlet, the improvement wherein the inlet of said mixing chamber is substantially round in cross-section and the outlet is substantially slit-shaped, whereby the kinetic energy of propulsion can be utilized with high efficiency to produce very fine gas bubbles. Advantageously the cross-sectional area at the outlet of the mixing chamber is about 5 to 25 times the cross-sectional area of the liquid nozzle throat, the liquid nozzle has a throat diameter d diverging to its discharge at an angle of about 5° to 10°, the mixing chamber beginning at a distance from about 1 to 3 d from the end of the inlet, the inlet of the mixing chamber being circular of a diameter of about 3 d, the mixing chamber having a length of about 5 d to 20 d, and the height of the slit being about 1 d. The injector is especially suited for use in treating liquid effluents and in fermentation processes.

Claims

1. In a process for intensifying mass transfer in a gas-liquid system by contacting a gas with a liquid utilizing the energy of a propulsion jet to produce very fine gas bubbles, the improvement which comprises passing a liquid through an injector comprising a propulsion jet nozzle, a housing thereabout and a mixing chamber communicating with said housing, said nozzle including a liquid inlet and a throat outlet directed toward the mixing chamber, said housing including a gas inlet, said mixing chamber communicating with said inlets and itself having a round inlet and a substantially slit-shaped outlet of about 5 to 25 times the cross-sectional area of the throat outlet, intimately contacting the gas with a liquid in the mixing chamber, the liquid velocity in the said chamber ranging from 5 to 30 meters per second, the ratio of the gas throughput in m_N³ per hour to the propulsion jet throughput in m³ per hour ranging from about 1:

1 to about 20;

1.

2. The process according to claim 1, wherein the gas-liquid system is a system for gassing liquid effluent.

3. The process according to claim 2, wherein the ratio of the gas throughput to the propulsion jet throughput is from about 5 to 10.

4. The process according to claim 1, where the gas-liquid system is a system for fermentation.

5. A process according to claim 1, wherein the throat diameter d diverges to its discharge at an angle of about 5°

to 10°

, the mixing chamber beginning at a distance of about 1 to 3 d from the end of the nozzle, the inlet of the mixing chamber being circular of a diameter of about 3 d, the mixing chamber having a length of about 5 d to 20 d, and the height of the slit-shaped outlet being about d.