Venturi and methods for particulate removal with counterflow sprays
AssigneeEnviroCare International, Inc.
InventorJames J. Schwab
Life of this patent
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Abstract
The present invention provides improved systems and methods for scrubbing gas with a venturi scrubber. A dual spray venturi scrubber, in which a scrubbing liquid is injected upstream and counter to the flow through the venturi, provides for improved scrubbing performance, including efficient and economical scrubbing of fine particles. Specifically, the present invention reduces the scrubbing liquid pumping requirements, improves the scrubber performance, and provides better control of the pressure drop across the venturi scrubber. The control of pressure drop across the venturi can be obtained with no internal mechanisms or upstream spray.
Claims26
A venturi scrubber for cleansing a contaminated gas flow, comprising:
- a venturi having an inlet for receiving the gas flow, a throat, and an outlet;
- a first nozzle to introduce fine droplets of a first cleansing liquid into said gas flow, and positioned upstream of said throat;
- and
- a second nozzle to introduce fine droplets of a second cleansing liquid into said gas flow, and positioned within said throat and oriented to introduce droplets with a component of velocity which is counter to the direction of gas flow through said venturi.
A venturi scrubber for cleansing a contaminated gas flow, comprising:
- a venturi having an inlet for receiving a flow of gas to be cleansed, a throat, and an outlet;
- means for introducing fine droplets of a first cleansing liquid into said flow of gas through said venturi and upstream of said throat;
- and
- means for introducing fine droplets of a second cleansing liquid in to said throat in a direction counter to the direction of gas flow through said venturi.
A venturi scrubber for cleansing a contaminated flow comprising:
- a venturi having an inlet for receiving a flow of gas to be cleansed, a throat, and an outlet;
- and
- a nozzle to introduce fine droplets of a cleansing liquid into said gas flow, where said droplets are introduced into said throat with a component of velocity which is counter to the direction of gas flow through said venturi,
- where the flow of said cleansing liquid is selected so that the pressure drop across said venturi scrubber is approximately equal to a specified pressure drop.
A method of cleansing a gas flow using a venturi scrubber at a prescribed pressure drop across a venturi having an inlet and a throat, comprising the steps of:
- injecting fine droplets of cleansing liquid counterflow to said gas flow and into said throat, and where the flow of cleansing liquid has a valve to adjust said flow;
- and
- adjusting said valve to maintain said prescribed pressure drop across the venturi.
A method of retrofitting a pre-existing venturi scrubber in an air pollution control system, said pre-existing venturi having a prescribed pressure drop, comprising the steps of:
- installing components within said pre-existing venturi including a nozzle to introduce fine droplets of a cleansing liquid into the throat of said venturi with a component of velocity which is counter to the direction of gas flow through said venturi;
- and
- selecting the flow rate of cleansing liquid so that the pressure drop across said venturi is approximately equal to the prescribed pressure drop.
Dependencies are inferred from the claim text.