Labyrinth seal coal injector

Claim 1

Apparatus for injecting dry particles into a pipeline containing a slurry of particles suspended in a pressurized fluid comprising: a base, a pipe-shaped housing attached to said base, said housing having an upstream end and a downstream end, said housing having an inlet for dry particles on the side of the housing near the upstream end and an outlet for particles at the downstream end, said housing having one or more fluid injection inlets near the downstream end for mixing lubricating fluid with dry particles for the formation of lubricated particles, a powered screw rotor inserted within the housing and extending from the upstream end to the downstream end, a pipe-shaped reducer, said reducer having an inlet end the same diameter as that of the downstream end of said housing, said reducer attached by the inlet end to the downstream end of said housing, said reducer having one or more fluid injection inlets near the inlet end for addition of lubricating fluid to provide further lubrication of lubricated particles, said reducer attached to an isolation valve, a mixing chamber attached to the isolation valve, said mixing chamber having a laterally attached fluid inlet pipe for transport fluid, said mixing chamber attached to a pipeline for transport of a slurry of particles suspended in a pressurized fluid.