For the Indian coal blend, the ignition temperature keeps on reducing with the increase in the MSW blend
proportion. Hence addition of MSW with the Indian coal helps in reducing the ignition temperature which is of great
importance due to very high level of ash content in the Indian coal, which makes it difficult to burn. But high level
of MSW blend with Indian coal results in large reduction in the ignition temperature, which did not allow to use the
same firing equipment designed for coal only combustion.
The ignition temperature of the Australian coal blend was not at all affected by MSW blending, even for high
level of blending say up to 50%. Hence addition MSW with Australian coal has no effect on the ignition temperature.
The char of the Australian coal get ignited only when it attains its own ignition temperature (416oC). This is due to
the fact that being the high grade coal, the Australian coal requires high activation energy to initiate combustion than
the energy supplied by MSW volatile. This shows a wide scope of blending MSW with the Australian coal with a
limitation to the amount of energy reduced by adding MSW.
The Indonesian coal behaved very differently when being added with MSW. Up to 20% of MSW blend, the
ignition temperature of the blended fuel is increasing. The blends more than 30% of MSW, exhibit a reduction in the
ignition temperature. The increase in the ignition temperature up to 20% of MSW blend is primarily due to dilution
of coal volatile by the MSW volatile, because both of them are liberated at the same time, which increases the
ignition temperature.
From these results it can be conferred that the behavior of ignition cannot be predicted from their weighted sum
of blend components as it behaves differently according to the quality of coal. The addition of MSW in the Indian
coal activates early release of the volatile matter and it provides enough ignition energy for ignition of char, which
represents a homogeneous combustion. In contrary, for the Australian coal blend, the ignition temperature did not
change at all even though there was a significant reduction in the volatile release temperature. Hence this behavior