Gas scrubber with adjustable convector and demisting unit

• US 3,994,705 A
• Filed: 05/27/1975
• Issued: 11/30/1976
• Est. Priority Date: 11/21/1974
• Status: Expired due to Term

• Current Assignee: MSP Corporation (TSI Incorporated)
• Original Assignee: Zygmunt J. Przewalski
• Inventors: Przewalski, Zygmunt J.
• Primary Examiner(s): Lutter, Frank W.
• Assistant Examiner(s): Prunner, Kathleen J.
• Application Number:
  US05/581,104
• Time in Patent Office: 553 Days
• Field of Search: 55/226, 55/236, 55/239, 55/249, 55/247, 55/255, 55/256, 55/257 MP, 55/257 HE, 55/267, 55/222, 55/237, 55/257 C, 261/62, 261/119 R, 261/DIG. 54
• US Class Current: 96/260
• CPC Class Codes: B01D 47/021 by bubbling the gas through a liquid bath
• CPC Class Codes: B01D 47/10 Venturi scrubbers

Abstract

The invention relates to an apparatus for agglomerating and precipitating suspended matter out of a gas using centrifugal acceleration within a treatment chamber distinguished by an inner cylindrical inlet tube through which the contaminated gas is led in a downward path and an outer circumscribing barrel through which the cleansed gas is led in a spiralling upward path. The inlet tube and barrel are mounted over and relative to a lower water filled reservoir or contaminant collection chamber. The gas exits from the inlet tube through an accelerator in the form of an adjustable venturi throat defined by a shroud arrangement vertically aligned with and spaced from the inlet tube and by which the downward flow direction of the gas is reversed as the gas aspirates water and passes upwardly through and out of the venturi throat and into the passageway defined by the inner inlet tube and the outer barrel. The upwardly moving gas is spirally deflected by means of spaced deflector plates outboard of and peripherally of the inlet tube and shroud so that a swirling motion is imparted thereto. The resultant force throws any heavy moist particles against an annular demisting collar which extends horizontally and radially outwardly into the path of the gas moving through the accelerator. The heavy mist impinging on the collar causes deflection thereby against the barrel wall whereby it is removed from the effluent and flows downwardly returnably to the water reservoir. The lighter mist-free gas bypasses the collar and moves in swirling fashion upwardly toward the clean gas outlet located within the upper part of the barrel, the gas picking up heat from the innermost inlet tube in its ascent and thereby assuring its mist-free condition upon reaching the gas outlet.

Claims

1. In a venturi gas scrubber suited for cleaning hot contaminated gases, the combination comprising a liquid storage tank, a quantity of gas cleaning liquid within said tank, an elongated tower member having an open bottom end supported within the tank and immersed within the liquid, said tower having a gas outlet port adjacent the top thereof, a gas inlet tube extending centrally along the interior of said tower toward said gas cleaning liquid;

a gas convector and demisting unit mounted on said gas inlet tube, adjustment means for adjustable axial positioning of the unit relative to said tube, said convector and demisting unit being partially immersed within the liquid and including a gas directing sleeve portion having an inlet end connected to the gas inlet tube by said adjustment means in flow communication with the gas inlet tube and a gas outlet end adjacent the surface of the liquid within the tank, an independent shroud partially immersed within said liquid and fully encircling said gas outlet end, said shroud being axially adjustable relative to said sleeve portion and spaced therefrom to provide an orifice of adjustable size therebetween and a continuous ring-like demisting collar fixedly connected to said shroud above said shroud and orifice for movement with said shroud, second adjustment means adjustably mounting said shroud and collar on said sleeve, said collar circumscribing said sleeve intermediate said gas inlet tube and said orifice and extending outwardly from said tube well above the surface of said liquid and within the flow stream of said orifice whereby liquid droplets accelerated through said orifice impinge on said collar and are deflected back toward the liquid within said bottom end of said tower while the gas travels toward the gas outlet port of said tower.

2. The gas scrubber of claim 1 wherein the gas outlet end of said sleeve portion includes a conical configuration whereby the gas is constricted and accelerated immediately prior to impingement on the cleaning liquid.

3. The gas scrubber of claim 1 including a fan unit adjacent said gas outlet port for impelling the gas through the scrubber.

4. The gas scrubber of claim 1 including a plurality of spaced deflector fins interconnecting said shroud and said collar and being oriented to impart a rotational flow component to the gas flowing from said orifice.

5. The gas scrubber of claim 1 including a heat exchanger operatively connected with said gas inlet tube and adjacent the outlet port of said tower to provide an indirect heat exchange function between the incoming and exhaust gases.

6. In a venturi gas scrubber suited for cleaning hot contaminated gases, the combination comprising a liquid storage tank, a quantity of gas cleaning liquid within said tank, an elongated tower member having an open bottom end supported within the tank and immersed within the liquid, said tower having a gas outlet port adjacent the top thereof, a gas inlet tube extending centrally along the interior of said tower toward said gas cleaning liquid;

a gas convector and demisting unit mounted on said gas inlet tube, adjustment means for axially adjusting the unit relative to said tube, said convector and demisting unit being partially immersed within the liquid and including a gas directing sleeve portion having an inlet end connected to the gas inlet tube by said adjustment means and in flow communication with the gas inlet tube and a gas outlet end adjacent the surface of the liquid within the tank, an independent shroud partially immersed within said liquid and fully encircling said gas outlet end, said shroud being spaced from said sleeve portion to provide an orifice therebetween and including a pair of concentric cylindrical shroud members defining a narrow annular space therebetween communicating with said gas cleaning liquid, said gas outlet end and said shroud members converging to define said orifice therebetween and promote aspiration of said liquid through said narrow annular space into said orifice, second adjustment means adjustably mounting said shroud on said sleeve, said shroud being axially movable relative to said sleeve portion to adjust the size of said orifice, said convector and demisting unit including means positioned to intercept said aspirated liquid-gas flow as it emerges from said orifice so as to rebound downwardly the liquid droplets and contaminants.

7. The gas scrubber of claim 6 wherein said shroud members are concentric and coaxially aligned with said sleeve portion, said members being axially offset relative to each other at said orifice.