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US 10,539,494 B1Granted
Portable apparatus for testing or calibration of a particulate emission monitor
AssigneeAirflow Sciences Corporation
InventorsRobert G. Mudry, Bruce R. Devlin, Jeffrey D. Everett
Life of this patent
Estimating the term…
Abstract
A particulate matter emission monitor for monitoring concentration of particulate matter concentration in a fluent stream passing through an industrial stack is tested and/or calibrated using apparatus which is scaled down in size from the much larger industrial stack.
Claims20
Apparatus for testing and/or calibration of a particulate matter emission monitor comprising:
- a vertical cylindrical stack having an open entrance at a lower end and an open exit at an upper end;
- a first wall which has a cylindrical open exit open to the open entrance of the stack, the cylindrical open exit of the first wall having a circumference inwardly spaced from a circumference of the open entrance of the stack;
- a second wall which has a cylindrical open exit whose circumference outwardly circumscribes the circumference of the cylindrical open exit of the first wall and cooperates with the cylindrical open exit of the first wall to create between them an annular space which is open to the open entrance of the stack;
- a nozzle which has a gas inlet, a slurry inlet, and a spray outlet, and which, when slurry containing particulate matter suspended in liquid is fed into the nozzle through the slurry inlet and gas is also fed into the nozzle through the gas inlet, is operable to eject, through the spray outlet and into the stack inwardly of the open exit of the first wall, a spray of liquid droplets which contain particulate matter;
- at least one fan which is operable to create an upward draft through the cylindrical open exit of the first wall and into the stack for carrying spray droplets upwardly through the stack to a measurement/calibration plane and also to create an upward draft through the annular space between the cylindrical open exit of the first wall and the cylindrical open exit of the second wall which continues through the stack as a curtain circumscribing the upward draft which has passed through the cylindrical open exit of the first wall and is carrying the spray droplets.
2 more elements
A method for testing and/or calibration of a particulate matter emission monitor disposed at a measurement/calibration plane of a vertical stack, the method comprising:
- creating an upward draft through a cylindrical open exit of a first wall, into an open entrance of the stack, and through the stack, including through the measurement/calibration plane, to an open exit of the stack which is spaced vertically above the open entrance of the stack, and concurrently creating an upward draft through an annular space cooperatively defined between the cylindrical open exit of the first wall and a cylindrical open exit of a second wall, into the open entrance of the stack and continuing through the stack, as a curtain circumscribing the upward draft which has passed through the cylindrical open exit of the first wall, to the measurement/calibration plane, and from the measurement/calibration plane to the open exit of the stack;
- creating a spray of liquid droplets which contain particulate matter, and introducing the spray into the stack for upward conveyance toward the measurement/calibration plane by the upward draft which has entered the stack through the cylindrical open exit of the first wall, and using the spray of liquid droplets which contain particulate matter to perform one of testing and calibration of the particulate matter emission monitor.
Dependencies are inferred from the claim text.