Apparatus for determining the humidity of exhaust air exiting a yankee dryer hood
First Claim
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1. Apparatus comprising, in combination:
- a yankee dryer including a rotatable heated dryer drum having an outer cylindrical surface for supporting and drying a paper web during transport of said paper web through a paper making machine and a dryer hood partially encompassing said dryer drum and having a hood interior through which the paper web is transported by said dryer drum, said hood having an exhaust air exit for exhausting air from said hood interior; and
an adiabatic saturator having an inlet in communication with the hood interior for introducing a sample of the exhaust air exiting said hood into said adiabatic saturator, said adiabatic saturator for determining the humidity of the exhaust air exiting said hood interior.
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Abstract
An adiabatic saturator receives a sample of exhaust air exiting a yankee dryer hood to determine the humidity of the exhaust air. The humidity is determined by temperature readings of the exhaust air, saturated air exiting the interior of a saturator cell, and water supplied to the saturator cell interior. An air distributor in the saturator cell interior promotes saturation of the exhaust air and a backflush mechanism backflushes the saturator cell interior to keep the water in the cell interior clean.
30 Citations
20 Claims
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1. Apparatus comprising, in combination:
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a yankee dryer including a rotatable heated dryer drum having an outer cylindrical surface for supporting and drying a paper web during transport of said paper web through a paper making machine and a dryer hood partially encompassing said dryer drum and having a hood interior through which the paper web is transported by said dryer drum, said hood having an exhaust air exit for exhausting air from said hood interior; and an adiabatic saturator having an inlet in communication with the hood interior for introducing a sample of the exhaust air exiting said hood into said adiabatic saturator, said adiabatic saturator for determining the humidity of the exhaust air exiting said hood interior. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. An adiabatic saturator having an inlet for introducing an air sample into said adiabatic saturator, said adiabatic saturator for determining the humidity of the air sample, said adiabatic saturator including a saturator cell having insulated housing walls including a side wall and a bottom wall defining a cell interior, said adiabatic saturator inlet being defined by a conduit extending to said saturator cell and into the interior of said saturator cell, said conduit defining an exit opening adjacent to the saturator cell bottom wall, water supply means for supplying water to said saturator cell and maintaining the water level in said saturator cell at a constant level, and air distributor means disposed about said conduit and located between said conduit and said saturator cell side wall, said air distributor means immersed in the water in said cell interior to laterally deflect air exiting said conduit exit opening and rising to the surface of the water in the saturator cell to prolong contact between said water and said rising air and promote saturation of said rising air by said water.
Specification