초록 ▼

In a system for moving large quantities of pulverulent material from receiving hoppers, such as those of a fly ash precipitator, into a pressurized air conveyor pipeline, separate auger conveyors move material from a first line of receiving hoppers and from a second line of receiving hoppers downstr

In a system for moving large quantities of pulverulent material from receiving hoppers, such as those of a fly ash precipitator, into a pressurized air conveyor pipeline, separate auger conveyors move material from a first line of receiving hoppers and from a second line of receiving hoppers downstream into gravity material inlets at opposite ends of an effectively airtight pressure conveyor casing. In the casing auger conveyor flights of opposite hand and substantially smaller than the casing means it toward a central outlet through which it drops into the pressurized air conveyor pipeline. Above the outlet the auger conveyor shaft has radial material agitating rods. The system is cycled to alternately feed material into the pressure conveyor casing at receiving hopper pressure, which is about atmospheric pressure, and out of the pressure conveyor casing at pipeline pressure. The pressure conveyor is pressurized through a series of air pressure pipes spaced along the casing substantially tangent to the lowermost part thereof, and casing pressure is relieved through a pipe above the central outlet.

대표청구항 ▼

A system for moving pulverulent material from a receiving hopper into a pressurized air conveyor pipeline comprising, in combination: pressurized mechanical conveyor means which has an effectively airtight casing, a material inlet in the top of said casing, a material outlet in the bottom of the cas

A system for moving pulverulent material from a receiving hopper into a pressurized air conveyor pipeline comprising, in combination: pressurized mechanical conveyor means which has an effectively airtight casing, a material inlet in the top of said casing, a material outlet in the bottom of the casing remote from said inlet, said outlet communicating with the top of the air conveyor pipeline, and rotatably driven auger conveyor means in said casing to move material from said inlet toward said outlet, said auger conveyor means comprising a shaft with a helical flight thereon the diameter of which is substantially less than that of the casing, and said shaft being so located in the casing that said flight has a circle of rotation slightly out of contact with the lowermost part of the casing; mechanical transfer conveyor means for moving material from the receiving hopper and dropping it by gravity into said material inlet at a controlled rate; a primary valve means to control movement of material through said inlet; secondary valve means to control movement of material through said outlet; means for varying the air pressure in said casing between receiving hopper pressure and pipeline pressure, said means comprising a plurality of air pressure pipes for admitting air at pipeline pressure to the lower part of said casing, said pipes being spaced along the casing between the material inlet and the material outlet and entering said casing transversely substantially tangent to the lowermost part thereof so air from said pipes enters the space in the casing below the auger flight, and an air discharge pipe for releasing air from the casing; and control means for filling said casing at receiving hopper pressure and emptying said casing at pipeline pressure in a predetermined continuous cycle.