In this paper, the armour and louvre ring of the MLS4028 vertical raw roller mill that contracted by Sinoma(TIANJIN) Powder Technology Ltd.  in a technological upgrading project is built into 3D geometry model and calculation meshes, then the flow field inside the middle and down parts of MLS4028 is numerically simulated by CFD technology. The main reasons resulting in abnormal wear of pressure frame are studied according to the simulation flow field, which indicates the unreasonable louvre angle inside armour ring causes the local big eddy and high speed gas current directly blowing the pressure frame. To relieve the pressure frame wear, different louvre angle and radial position are simulated and the reasonable values of the two parameters are obtained by studying simulation results, according to which the solution scheme is designed and adopted. Finally good industrial application results proves that it is a good solution to the abnormal wear problem of the pressure frame, which provides a practical and feasible solution scheme for the alike wear problems of vertical roller mill.

Hazardous wastes containing three typical pollutants such as Cr, Pb and Cl were co-processed in cement kiln,simultaneously the curing rates in clinker were respectively examined.The results showedthat the curing rate of Cr, Pb raised when the hazardous waste disposal amounts increased, except the curing rate of Cl declined when the hazardous waste disposal amounts increased. The quality of the clinker was detected during the co-processing.The results showedthat the fCaOrate values and 28d strength of clinker could satisfy the related standards.

Gear ring utilized for rotary kiln was usually formed by casting, and the casting quality determined using security, the heat treatment process determined service life. Through improving the casting process, the casting quality can be improved. The grade of casting quality was determined by two nondestructive testing technique which were ultrasonic nondestructive testing (UT) and magnetic particle nondestructive testing (MT). Heat treatment process was changed from normalizing + tempering to quenching + tempering, which could increase the tooth surface hardness, thereby achieve the purpose of improving the service life of the gear ring.

Large casting girth gear is one of the most important kiln castings, through the large girth gear transmission torque, so as to drive the kiln rotation. Because of the large dimensions, long casting cycle, and complex manufacturing process of the kiln large casting girth gear, how to improve the finished product’s quality has great significance. This article focuses on analyzing two aspects of how to effectively improve the quality of the girth gear, one factor is the structural design and the other is the manufacturing process control.

Technical mechanism of the cement kiln denitrification technology was discussed. Through theoretical calculation, the thermal testing, commissioning, the denitrification duct, staged combustion, no-ammonia denitrification , which were widely used by the cement industry, were researched and compared.

Overall design, building formwork and cast-in-situ construction on site are adopted usually for traditional concrete silo decompression cone at home and abroad. In order to research saving the cost of formwork and other, two construction ways are adopted for decompression cone of the two raw meal silos of this project: cast-in-situ construction on site; precast concrete on site and lifting and installation. For precast construction, through summarizing the construction experience of previous decompression cone, breaking through the technical difficulties of decompression cone construction, we make construction plan from the follow sides: reasonable arrangement of the site, rebar tying, casting, maintenance, selection of machinery, hosting, etc. In combination with the characteristics of precast element, hosting and casting, the technical breakthrough and innovation process of the construction process are completed. At last, through two construction ways, we get the conclusion.

Using carbide slag as the calcareous raw material to produce cement, system operation control parameters are different fromthose of the traditional limestone production line.Because of the different characteristics of the carbide slag and the limestone, the main reaction of the calcium carbide slag decomposition process is dehydration process Ca(OH)2, so the calcinertemperature controled is reduced, the calcinercoal amount is less than the kilncoal usage, clinker heat consumption greatly reduced.Due to the activity of calcium carbide slag containing high CaO, it can produce high quality clinker.