The quality of girth gear was always the top priority in Quality Control Planning which was formed by casting and used for rotary kiln. The inner quality of girth gear was not only strictly tested by the ultrasonic nondestructive testing (UT), but also the surface quality was tested by magnetic particle nondestructive testing (MT) in the finished. UT unqualified, the girth gear failed. UT qualified, but MT unqualified, especially loose, slag and micro cracks on tooth surface caused MT unqualified, the defect could be polished cleanly. At the same time, VC unqualified, in order to solve this problem, a surface cold welding technology was applied to the teeth on the girth gear technology only for the appearance "beautifying". Repair performance of the gear ring itself did not affect.

For captive power station in oversea cement plants where weak power supply, based on the principle of "energy grade, step utilize", waste heat steam can be highly connected with reheating power generation unit since the high pressure cylinder exhaust steam from reheating turbine unit is similar to waste heat generated steam, thus the reheater of coal fired boiler can improve the waste heat steam quality and increase the total thermal efficiency and power output of the power generation unit. This article compares and analyzes the indexes and data of high temperature super-high pressure reheating unit with the regular high temperature high pressure unit + condensing waste heat power generation unit, which shows the coal consumption, self-power consumption and power output of super-high reheating unit are all optimized to high temperature high pressure + waste heat power generation unit. Land occupation, investment and system configuration are also compared for reheating unit and regular unit, which shows the direction of reheating unit application in captive power plants of other industrial area.

There are vibration problems for horizontal gas duct in the WHR boiler. To deal with this problem, we research on the operational states of large amount of projects and analysis theoretically on the acoustic resonant caused by frequency coupling between Karman vortex and inherent frequency of air space, a solution by avoiding acoustic resonant with adding vertical antivibration plate in horizontal gas duct was proposed, separating it into two cavity. Finally, the problem of vibration of horizontal gas duct was solved.