Fly Ash Handling System
The pressure conveying system is a dense phase, medium to high pressure low to medium velocity conveying system. It is generally used for conveying high to medium density, heat sensitive, semi-abrasive or very abrasive, cohesive materials in any particle size range. This is the most reliable to minimize particularly the problem for handling the wide and adequate range of dry solids.
This concept uses a non-fluidizing/fluidizing type pressure vessel to feed material into the conveying line at maximum density. The air quantity is added along the conveying line.
The pressure conveying system is a dense phase, medium to high pressure low to medium velocity conveying system. It is generally used for conveying high to medium density, heat sensitive, semi-abrasive or very abrasive, cohesive materials in any particle size range. This is the most reliable to minimize particularly the problem for handling the wide and adequate range of dry solids.
Dense Phase system is applicable to push the highly dense concentration of bulk solids/Fly Ash effectively at a low constant speed inside the conveying line. This conveying is reliable, flexible and maintenance free due to lower quantum of moving parts.
This concept uses a non-fluidizing/fluidizing type pressure vessel to feed material into the conveying line at maximum density. The air quantity is added along the conveying line through Boosters provide at interval on the pipe line to overcome the pipeline frictional losses thus pumping material at the highest obtainable efficiency. These Boosters also help in minimizing the compressed air consumption and pipe abrasion.
The plugging problem is prevented by improving the ratio of the material to air throughout the system to convey the material at the highest obtainable efficiency and degree of reliability. The highly abrasive material can be conveniently conveyed at lowest possible velocities consuming nominal quantity of air with the help of these systems. The highly flexible check valve provided with booster fittings are very responsive to any back feeding due to changes in conveying line pressure thereby allowing throttling of the air supply pressure and volume automatically.
During the filling cycle, material gravity feeds into the transporter through an inflatable seated valve. Displaced air is vented up through a vent valve to allow easier filling. Once the transporter is filled, as signaled by a level control or weighing device, the inlet valve and vent valve close and seal. The only compressed air that enters the transport vessel is the air that is used for material displacement. All other air required for conveying is added through the booster fittings. A pressure switch is used to monitor the air pressure in the transport vessel and is set to activate at a predetermined low pressure setting at the end of the conveying cycle. The switch turns off the air supply, allowing the residual air volume to purge the transporter and conveying line. Characteristics of this system are high air flow at the beginning and end of the transport cycle and a low air flow in between, with lower conveying line pressures.