The combined grinding system of "roller press + ball mill" in a cement production line has some problems, such as high power consumption in the process, frequent pressure relief in the roller press and instantaneous stop. By optimizing the parameters of the system process equipment, improving the work efficiency of the roller press, adding the point pressure relief valve of hydraulic system, installing the online laser particle size analyzer, and implementing the transformation of the intelligent control system, the power consumption of the grinding system process is reduced by 2.08kW·h/t, and the standard deviation of cement strength is reduced to below 0.8, which effectively improves the production economic index of the cement grinding system and improves the stability of product quality.

Based on the requirements of double control of energy consumption in the cement industry under the background of double carbon, the main factors affecting heat consumption in the thermal balance expenditure of the existing production line were analyzed through the calculation of thermal efficiency. It put forward the energy efficiency improvement solution, which is typically applied in the technical transformation of the existing production line, and the thermal efficiency of the sintering system is further increased by 5%~9%. Fuel consumption per unit product of clinker can be reduced by more than 10kg/t.cl, reaching and better than level 1 of GB 16780-2021. It improves energy efficiency while taking into account the environmental protection function of the pyro-system, through the application of calciner self-denitrification technology to reduce source emission. The CO content out of calciner would not exceed 500ppm and the original NOx before ammonia below 350mg/Nm³, the ammonia water consumption below 3kg/t.cl under the condition of NOx emission below 50mg/Nm³ of environmental protection requirements. These measures and technology would help the plants to meet the rapid development of enterprises.

This paper briefly describes the general situation of the desulfurization project of a 4 000t/d cement clinker production line, compares the characteristics and application of wet and semi-dry desulfurization processes, and introduces in detail the selection principles of desulfurization schemes and the configuration of this desulfurization system. After the limestone-gypsum desulfurization system put into operation, the sulfur dioxide emission concentration at the outlet of the main chimney is reduced to 30mg/Nm³, which is superior to the latest emission standards of both national and Shandong Province. The desulfurizer is the recycled ash from the preheater, which can save about  530 000 yuan of cost per year. The by-product desulfurized gypsum can be directly used in cement production, which can create an economic benefit of 280 000 yuan per year.

The flue gas characteristics of cement kiln and the influence of SCR denitration system on cement kiln and waste heat power generation system were analyzed. In view of the difficulties in implementing SCR denitration, the technical route of "high temperature and high dust" SCR denitration process was determined to achieve ultra-low emission of nitrogen oxides at the kiln tail. Using "high temperature and high dust" SCR denitration system process scheme, nitrogen oxide emission concentration can be reduced from 300mg/Nm³ to 45mg/Nm³, to meet the requirements of ultra-low emission, ammonia escape concentration <5mg/Nm³, tons of clinker production cost is expected to increase 4.25 yuan, the total power generation of waste heat power generation system is expected to reduce 0.67%.

This paper introduces the working principle of Coriolis force scale measuring system and its supporting feeding equipment. From the aspects of system development of "low height and small space", design of "anti-pressure material" system of steady flow machine, and development of metal composite wear-resistant measuring disk, this paper summarizes the equipment optimization scheme of Coriolis force scale measuring system applied in cement slag powder measurement, and combines application cases. The technological optimization scheme and application effect of Coriolis force balance system in slag measurement technical renovation project are analyzed.

This paper introduces the main structure and working principle of the hydraulic system of the roller press, the function, installation position, structural form, installation form and working principle of the common relief valve used in the hydraulic system of the roller press. The judgment method, maintenance points and maintenance precautions of relief valve fault in the hydraulic system of roller press are put forward.

he working principle of laser ranging equipment and its application in the measurements of the rotary kiln tire run-out, the supporting wheel deflection, and the cylinder eccentric deformation are introduced. The measured data can help operators understand the operating status of the equipment and the potential safety hazards of the equipment. By improving the process operation method and adjusting the operating status of the rotary kiln, the running rate of the rotary kiln can be effectively improved.

This article introduces the composition of ABB AC900F DCS automatic control system of aggregate production line, the construction of trend server of engineer station, the setting of Modbus TCP protocol and Modbus 485 protocol, and the programming of DCS of aggregate production line, etc. The system can directly display the operating situation of the equipment on the operator screen, and improve the operating efficiency of the equipment through data analysis. It can effectively supervise the abnormal operation of the production area and equipment, and automatically alarm and shut down.

Corrosion on the node or support of the spatial grid structure in cement production lines can easily lead to the failure of the related rods, causing the continuous collapse of the spatial grid buildings(structures). Finite element numerical simulation is used to study the continuous collapse resistance of structures in service under different corroded years. In the dynamic response process, the maximum stress of single-layer reticulated shell reaches 1.5 times of that under static action, some members yield, and the displacement of adjacent joints reaches 1/500 to 1/300 of structural span. The double-layer spherical reticulated shell structure has higher redundancy and better resistance to continuous collapse.

The influence of modified phosphogypsum on the setting time and strength of ordinary portland cement was studied by small mill test, and the proportion of cement produced by modified phosphogypsum in winter and summer was determined. The production practice shows that the cement products produced by phosphogypsum with pH value of 7~13 completely meet the requirements of national standards, and the setting time can be adjusted widely. The application of modified phosphogypsum not only digested the industrial waste residue, but also reduced the production cost, which brought good social and economic benefits.