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US 6,669,547 B2Granted
Multi-stack exhaust system
AssigneeBoard of Regents of the University of Nebraska
InventorMingsheng Liu
Life of this patent
Estimating the term…
Abstract
A multi-stack exhaust system and method including at least one fume hood, multiple exhaust stacks, each stack having a return duct with a return damper and a discharge duct with a discharge damper, a fan, a flow sensor, a first static pressure sensor for measuring the static pressure at the inlet duct, a second static pressure sensor for measuring the static pressure at the at least two exhaust stacks, and a controller.
Claims22
A multi-stack exhaust system, comprising:
- at least one fume hood adapted for intake of toxic exhaust into an inlet duct in fluid communication with the at least one fume hood;
- at least two exhaust stacks, each stack having a return duct with a return damper and a discharge duct with a discharge damper, wherein the return duct returns air and/or toxic exhaust to the inlet duct and the discharge duct discharges toxic exhaust to the environment;
- a fan, adapted to convey the toxic exhaust from the inlet duct to the at least two exhaust stacks;
- a flow sensor for measuring the flow of toxic exhaust in the inlet duct, wherein the discharge dampers are adjusted such that the total flow from the discharge ducts is approximately equal to the flow of toxic exhaust in the inlet duct;
- a first static pressure sensor for measuring the static pressure at the inlet duct, wherein an inlet duct static pressure set point is maintained by adjustment of the return dampers;
- and
- a second static pressure sensor for measuring the static pressure at the at least two exhaust stacks, wherein an outlet duct static pressure set point is maintained by adjustment of the speed of the exhaust fan.
4 more elements
A method for exhausting toxic exhaust, comprising:
- generating toxic exhaust in at least one fume hood;
- passing the exhaust from the at least one fume hood to an inlet duct in fluid communication with the at least one fume hood;
- conveying the toxic exhaust to at least two exhaust stacks by a fan, each stack having a return duct with a return damper and a discharge duct with a discharge damper, wherein the return duct returns air and/or toxic exhaust to the inlet duct and the discharge duct discharges toxic exhaust to the environment;
- measuring the flow of toxic exhaust in the inlet duct, wherein the discharge dampers are adjusted such that the total flow from the discharge ducts is approximately equal to the flow of toxic exhaust in the inlet duct;
- measuring the static pressure at the inlet duct, wherein an inlet duct static pressure set point is maintained by adjustment of the return dampers;
- and
- measuring the static pressure at the at least two exhaust stacks, wherein an outlet duct static pressure set point is maintained by adjustment of the speed of the exhaust fan.
4 more elements
Dependencies are inferred from the claim text.