초록 ▼

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 into gravi

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 into gravity material inlets at opposite ends of an effectively airtight casing of a pressure mechanical conveyor wherein auger conveyor screws of opposite hand move it toward a central outlet through which it drops into the pressurized air conveyor pipeline. The auger conveyors and the pressure conveyor augers operate continuously; and 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 cycles of two or more pressure conveyors are out of phase with one another so they feed material into the pipeline consecutively to provide level pipeline flow. If the material comes from precipitator hoppers which are filled by material dropping from a gas stream, the airtight pressure mechanical conveyor is at the upstream ends of the lines of receiving hoppers.

대표청구항 ▼

A system for moving pulverulent material from a receiving hopper into a pressurized air conveyor pipeline comprising, in combination: pressure mechanical conveyor means which has an effectively airtight, substantially horizontal casing, a material inlet pipe attached to the top of said casing and co

A system for moving pulverulent material from a receiving hopper into a pressurized air conveyor pipeline comprising, in combination: pressure mechanical conveyor means which has an effectively airtight, substantially horizontal casing, a material inlet pipe attached to the top of said casing and communicating with the interior thereof, a material outlet pipe attached to the bottom of the casing remote from said inlet, said outlet pipe communicating with the interior of the casing and with the air conveyor pipeline through the top thereof, and a mechanical conveyor in said casing to move material through said casing from said inlet pipe to said outlet pipe; transfer conveyor means operatively connected to the bottom of the receiving hopper and to the material inlet pipe of the pressure mechanical conveyor casing, said transfer conveyor means including a material confining pipe and a mechanical conveyor in said pipe; primary valve means in said inlet pipe to control movement of material into the casing; secondary valve means in said outlet pipe to control movement of material from said casing into the air conveyor pipeline; means for varying the air pressure in said casing between a lower pressure close to atmospheric and higher pipeline pressure; and control means for filling said casing at said lower pressure and emptying said casing at said higher pressure in a continuous cycle.