There are multiple sources of risk in segmental tunnelling, so analysis is made of the source of leakage risk from the tunnel tail sealing.

Using self-made air-curtain replacing wind-door for blocking air leakage in ventilation system;

Research on cyclone separating efficiency affected by air leakage at the discharging chute;

To tackle the air leakage problems of trisector rotary air preheater in a comprehensive way;

An expression for permeability factor of loose coal in the gate and a formula relating air-leakage intensity and pressure gradient are presented as a result of exploring the law of air-leakage in gate coal seam.

The working principles of air-leakage control systems for rotary air preheaters used already in one power plant have been summarized, the main causes leading to air-leakage of air preheaters being analysed, putting forward a new method for realizing air-leakage control of the air preheaters by using the fuzzy controller based on the language control regulations.

The causes and affecting factors of air-leakage in the rotary air preheater of boiler no.

According to the conclusion,the collecting flue gas tubes were modifyed to prevent air leakage and the satisfactory effect has been abtained.

The research shows that there are two effective measures for controlling methane at the upper corner of goaf,that is,increasing sources of leakage and decreasing the amount of leakage in goaf.

This paper investigates the issue involving the air leakage of preheaters.