Dust return system
AssigneeCMI Corporation
InventorsGeorge W. Swisher, Jr., Stuart W. Murray
Life of this patent
Estimating the term…
Abstract
A closed, pressurized dust return system for introducing aggregate dust into a stream of liquid asphalt is provided. Aggregate dust is dispensed through a valve from a receiving chamber into a mixing housing. The aggregate dust enters the mixing housing at an intermediate location therein. The liquid asphalt is introduced into the mixing housing through a separate conduit at a location thereon above the point of entry of the aggregate dust. The liquid asphalt and the aggregate combine within the mixing housing to form a slurry composition. A heating jacket substantially surrounds the mixing housing and a system for preventing liquid asphalt from backing up into the receiving chamber is also provided. The dust return system is particularly useful in an asphalt plant using a baghouse.
Claims14
An apparatus for mixing a particulate additive with liquid asphalt comprising:
- means for receiving the particulate additive;
- means for mixing the particulate additive with a stream of liquid asphalt wherein the means for mixing comprises, a cylinder having a first end and a second end and a cylinder opening intersecting said ends, and wherein the cylinder is further characterized as having an expanded portion extending from the first end and terminating at an intermediate location on the cylinder and a reduced portion extending from the expanded portion and terminating at the second end of the cylinder;
- means for dispensing the particulate additive from the means for receiving to the means for mixing the particulate additive with the liquid asphalt such that the particulate additive is dispensed generally into the center of the stream of liquid asphalt;
- and
- wherein the combination of the means for receiving, the means for dispensing and the means for mixing form a closed, pressurized environment.
An apparatus for mixing a particulate additive with liquid asphalt comprising:
- a receiving chamber;
- means for mixing the particulate additive with the liquid asphalt wherein the means for mixing comprises a cylinder having a first end and a second end and a cylinder opening intersecting said ends and a duct having a first end, a second end and a duct opening intersecting said ends, wherein the second end of the duct extends into the cylinder opening;
- a valve secured between the receiving chamber and the mixing means for operation between an open position and a closed position such that when the valve is in the closed position, particulate additive is prevented from entering the means for mixing;
- wherein the combination of the receiving chamber, the valve and the means for mixing form a closed, pressurized environment;
- and
- means for monitoring the pressure within the closed pressurized environment.
An apparatus for mixing a particulate additive with liquid asphalt comprising:
- a receiving chamber wherein the receiving chamber includes a cylinder having a first end, said first end being closed, a second end, said second end being open, and a cavity extending between the first end and the second end, and wherein the valve is secured to the second end of the receiving chamber, and wherein the particulate additive is introduced into the cavity at an intermediate point in the cylinder to flow generally towards the second end thereof;
- means for mixing the particulate additive with the liquid asphalt;
- a valve secured between the receiving chamber and the mixing means for operation between an open position and a closed position such that when the valve is in the closed position, particulate additive is prevented from entering the means for mixing;
- wherein the combination of the receiving chamber, the valve and the means for mixing form a closed, pressurized environment;
- and
- means for monitoring the pressure within the closed pressurized environment.
Dependencies are inferred from the claim text.