Introduction
The goal of the project is the designing of an efficient disposing and transporting system for
the fly ash slurry. Fly ash is generated when pulverized coal is burnt in the power plants
which use coal. It consists the finer particles that are generated along with the flu gases. They
can be retained using electrostatic precipitator or particle flirtation device. It is not a useful
product and is problematic for environment. It has big moisture content that makes it tough to
handle and dispose off.
Some ways to transport it are : to mix it to water and transport it using hydraulic method,
transport in a state that is not totally liquid on road (environment problems and high cost) or
discharge it using pneumatics. Tailing dams can also be used but they consume more space
area and need more water. It can be made to recycle also like for producing mortar as well as
bricks and for land filling and re vegetating purpose.
Literature Survey
The main concern here is the design of transport system for fly ash slurry. On mixing with
water, the fly ash behavior becomes non-Newtonian. The viscosity becomes variable. In
designing a pipeline transportation system, the method followed must show rhelogical (flow
of fluid and deformation) behavior for the heavy fly ash slurry. Rheologic characterization is
carried out by the use of a pipe based or capillary based rheometer. Some parameters like
particle concentration, temperature as well as the velocity gradient change the characteristics
of the slurry (like viscosity and density).
Two systems have been studied here - the slurry transport mechanism and the pneumatic or
mechanical mechanism. A quality comparison is carried out for both. Here, the theory based
thermo – fluid knowledge and skills are applied for practical system design.
Nowadays, there is stress on producing clean coal. So, the slurry output has increased
tremendously. It consists of finer coal particles, clay particles and water which has to be
removed. If the water is removed and solid material is made to rest on land, it settles under
gravity but the process is very slow and takes so much space. This is also not good for the
environment. Proper method needs to be followed for solid material disposal. To dewater the
coal mine, high speed centrifuges and belt press filters can be used.
Pump and slurry pipe system
Study of the composition and rheological features of the fly ash slurry
Details of Slurry material

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Transportation of Fly-Ash Slurry for Mechanical Engineering Students

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