Sinoma Xiangtan Cement Co., Ltd. has a 5 000tpd cement production line with 2 sets of roller press cement combined-grinding system. One of the system was designed as open-circuit ball mill. After putting into operation，this open-circuit grinding system appeared many problems such as high products temperature，low capacity，more power consumption etc. In 2018，in order to improve products quality and reduce power consumption，the company implemented modification and optimization on this system，mainly，modificated it to a closed-circuit ball mill system with a high efficiency dynamic separator. After commissioning period，the capacity achieved 200t/h and SPC is 33kWh/t for P·C32.5 type cement. When produce P·O42.5 type cement, the capacity is about 205t/h ＠360±15m2/kg blain, and NC 26%～27%. Moreover, this system can be production in open-circuit or closed-circuit mode alternatively according to the requirements. 

The general idea of intelligent construction of cement production and five aspects of intelligent cement plant construction are described. The intelligence from supplier to customer, from production to business (control), from design to service (engineering operation and maintenance) is constructed. The cement production framework builds intelligent digital factories around seven dimensions: production management, process management, energy management, quality management, safety management, equipment management, and supply chain management. After the implementation of the cement intelligent manufacturing production control MES system, it can realize the visual control of the whole process of cement production management, optimize the personnel structure, reduce the labor intensity, reduce the labor cost, and reduce the subjective participation in the production, testing, inspection and other production links. The production process effectively guarantees production stability and product quality, improves production system operation efficiency, eliminates safety hazards, reduces pollution waste discharge and operating costs, and provides strong support for efficient operation of production.

According to the ambiguity of the detection method of the center height difference of the bearing seat of the supporting wheel in GB/T 32994-2016 "Rotary Kiln for Cement Industry" and JB/T 8916-2017 "Rotary Kiln", by the methods of the ambiguity analysis of the definition of the center height of the bearing seat, the analysis of the factors affecting the center height of the bearing seat at both ends of the bearing group and the problems existing in the traditional detection method , it put forward the reasonable detection method of bearing seat center height of rotary kiln supporting wheel, the matching method of bearing seat center height difference and the assembly inspection method of bearing group supporting wheel center height difference. The principle of paired detection is introduced, and the detection accuracy is analyzed. It is concluded that the center height of the ball center of the bearing seat can be measured by measuring the diameter of the oil groove, the diameter of the spherical surface and the depth of the bottom of the oil groove; the center height difference of the ball center of the bearing seat can be calculated by means of the auxiliary measuring frame; and the center height difference of the two ends of the bearing group can be calculated by measuring the dimensions of the parts of the bearing group; the detection method can not only be used for the center high qualified inspection of the bearing seat, but also for the matching of the center height difference of the bearing seat of the same bearing group , and the judgment of whether the center height is reworked can also be made through the matching inspection. The measurement and control methods make up for the vacancy of the detection method of the center height difference of the bearing seat in the standard, and revise the standard. It provides a reference basis and has a guiding significance for the detection of the difference between the central height of rotary kiln and the central height of the bearing seat.