System for removing surface moisture from coal
AssigneeCoomtech Ltd
InventorPatrick Foss-Smith
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Abstract
This invention provides a system for removing surface moisture from granulated coal or other materials in particulate form, the system comprising a dryer, wherein the dryer has: an in-feed (1) for material particles; an in-feed (3) for entrainment gas (suitably air) to provide dilute phase gas entrainment of the particles; and turbulence—inducing means (5) configured to subject the flow of gas—entrained particles to turbulence to strip water from the surface of the entrained particles. The system is highly efficient and economical to operate, requiring no external heat input and yet achieving a high drying effectiveness
Claims23
A system for removing surface moisture from granulated coal or other materials in particulate form, the system comprising a dryer, wherein the dryer has:
- an in-feed for material particles;
- an in-feed for entrainment gas(es), to provide dilute phase gas entrainment of the particles;
- and
- turbulence-inducing means configured to subject the flow of gas-entrained particles to turbulence, wherein the turbulence-inducing means comprises a supply of dry gas(es) in use and that delivers the dry gas(es) so as to impinge on/intersect with the gas-entrained particle flow whereby inducing turbulence to strip water from the surface of the entrained particles.
A system as claimed in any preceding claim, wherein the dryer is configured to operate to rotate the gas-entrained particle flow as it passes therethrough and the entrainment gas in-feed comprises one or more ports that are substantially tangential to the longitudinal axis of the dryer to initiate rotation of the flow of gas-entrained particles.
A system as claimed in any preceding claim, wherein the in-feed for the material particles comprises a venturi educator.
A system as claimed in any preceding claim, wherein the main duct of the dryer through which the gas-entrained particles flows has, proximate the in-feed end, a throat to cause an increase in flow velocity and drop in pressure with a corresponding velocity differential between the entrainment air and entrained particles to induce stripping of water.
A system as claimed in any preceding claim, wherein the system further comprises an ultrasound generator configured to apply ultrasound to the gas-entrained particle flow.
A system as claimed in any preceding claim, wherein the system further comprises a generator of low frequency sound below 20 kHz or infrasound.
A process for removing surface moisture from granulated coal or other materials in particulate form, the process comprising feeding the material particles and entrainment gas(es) into a duct to provide dilute phase gas entrainment of the particles and introducing dry gas(es) to impinge on the flow of gas-entrained particles to cause turbulence in the flow of gas-entrained particles to strip water from the surface of the entrained particles.
Dependencies are inferred from the claim text.