Method and apparatus for filtering a stream of gas while drying waste lignocellulosic material

Patent · Tue Sep 27 04:00:00 EDT 1983

OSTI ID:5440866

Potter, G R

A method is disclosed for using comminuted lignocellulosic waste material such as flake-like wood and bark chips which have been stored outside includes placing the material in a filter bed by movement in a first direction, and thereafter passing polluted effluent gas from a boiler furnace, for example through said filter bed in a direction generally perpendicular to said first direction to filter pollutants from said effluent gas and simultaneously dry the comminuted lignocellulosic waste material. During drying of the material a portion of the material on the gas outlet side of the filter bed, toward which the effluent gas proceeds, is maintained at a moisture content which is greater than the average moisture content of the lignocellulosic material at the time it is placed into the filter bed. The lignocellulosic waste material is thereafter used as furnace fuel or as a furnace for an industrial process. A filter/dryer apparatus includes a vertically oriented filter bed for holding a quantity of filter material, with downwardly sloping, upwardly convex, horizontally extending louvers on a gas inlet side to retain the filter material. On a gas outlet side, a grid of vertical triangular bars defines a slotted surface to retain the filter material. The grid is reciprocatingly movable up and down and a horizontally movable shuttle is located beneath the filter bed. Means coordinate the movement of the grid and shuttle to move filter material downward through the filter bed of the apparatus.

• Assignee: EDB-84-029724
• Patent Number(s): US 4406676
• OSTI ID: 5440866
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
AIR POLLUTION CONTROL
COMMINUTION
CONTROL
DESIGN
DRYING
FILTERS
GASEOUS WASTES
INDUSTRY
MANAGEMENT
POLLUTION CONTROL
SOLID WASTES
STACK DISPOSAL
WASTE DISPOSAL
WASTE MANAGEMENT
WASTE PRODUCT UTILIZATION
WASTES
WOOD PRODUCTS INDUSTRY
WOOD WASTES