In this paper the effect of residual frequency offset (RFO) on OFDM systems is analyzed.

A residual frequency offset correction algorithm based on the minimum mean square error in all-digital receiver is introduces,which aims to decline the cumulative error rate caused by the residual frequency offset,and to determine the size of decision threshold through the use of minimum mean square error criterion.

The flue gas residual swirling at furnace outlet is considered as an essential problem for tangential firing boiler.

In circular firing system,residual rotation of airflow at furnace outlet is the main reason for gas temperature deviation between two sides of furnace outlet and horizontal gas duct.

It is deemed that the residual rotation of exit gas from the furnace with tangential corner firing would result in the maldistributions of gas velocity and temperature entering the convection tube banks, which would in turn lead to failures from overheating parts of high-temperature convection heating surfaces.

In this paper,a new method,installing a kind of cross heating surface at furnace outlet of tangential firing system,has been presented to eliminate residual rotation and further to decrease the velocity deviation and thermal deviation at horizontal gas pass.

Influence of reverse tangential mode of primary air on slagging and residual torsion and its numerical simulation;

Some measures are proposed for lessening residual swirl flow from the viewpoint of boiler structural design.

The effects of such structures on the residual swirl at the furnace outlet and the velocity distribution at the inlet of horizontal gas pass were studied.