This paper introduces the large raw meal roller press finish grinding system developed by Tianjin Cement Industry Design＆Research Institute, which adopts newly developed equipment and technology, such as large raw meal roller press, new combined seperator, low-resistance and high-efficiency cyclone, high-efficiency fan, and intelligent control technology. The optimal system power consumption is only 9.1kW·h/t, and the average power consumption is reduced to 12.0kW·h/t, which has obvious advantages in energy saving.

By 3D modeling and finite element analysis, the analogue simulation on force analysis of bearing in detail is carried out. The position of fatigue is pointed out and the cause is analyzed. Finally, using the L-P bearing fatigue life theory and rolling bearing fatigue life correction method, under the standard working conditions, considering the bearing ambient temperature, bearing material performance, lubrication, impact load and so on, the fatigue life of bearing is calculated, which provides theoretical guidance for life prediction and fault warning of large vertical grinding equipment in industry.

The influencing factors of carbon emissions during cement production are analyzed, and a simple calculation method of element conservation to calculate carbon emissions is proposed in combination with the clinker and cement preparation process. A comparative analysis is made with the current and trial cement greenhouse gas emission accounting methods. Improving energy efficiency, upgrading green environmental protection equipment, and developing alternative fuel technologies are very practical measures to reduce pollution and carbon in recent years, supplemented by new energy technologies, carbon capture, and carbon utilization, which are expected to promote the realization of "carbon neutrality" in the cement industry.

Current preheater technology development is briefly introduced. In order to improve the efficiency of cyclone separation, and reduce resistance loss, a type of weak eddy current and low resistance preheater technology is developed. The existing preheater tower structure would not require being changed and the cyclone cylinder diameter not to be enlarged. It can be utilized under the premise of present preheater selection, through optimizing cyclones to reduce resistance by more than 10%, and improve the preheater system separation efficiency to more than 95%. Now it has been applied in many production lines, and the cost of cement production has been significantly reduced.

The operation standard and effect of flue gas wet desulphurization system are summarized, and the composition and process flow of gypsum dehydration unit are introduced. The original dehydration unit covers a large area, complex process and inconvenient maintenance. The improved dehydration unit has the advantages of compact layout, small area, convenient maintenance and low cost of construction, operation and maintenance.

When using glass fiber filter cartridge as relatively high-temperature particulate matter collection material in ultra-low emission flue gas monitoring, the detection results of particulate matter concentration may be inaccurate or negative. Selecting the same batch of filter cartridges for parallel experiments, the weight loss of glass fiber filter cartridges under different temperatures and cooling conditions were studied and the reasons for influencing the constant weight of filter cartridges were analyzed. The results showed that drying time, drying temperature and storage environment may influence the constant weight of filter cartridges. Based on the above, the feasible pretreatment method of filter cartridges was proposed.

Based on "low NO_X burner + staged combustion +SNCR", through source control, post-emission management, whole system intelligent process control, whole process refined operation control and other measures, the cement clinker production line denitrification transformation was carried out. After modification, the nitrogen oxide emission concentration is less than 50mg/m³, ammonia slip is less than 8mg/m³, ammonia consumption is about 0.85m³/h, and the clinker ammonia consumption is 3.96kg/t.clinker, achieving the purpose of energy saving and consumption reduction and ultra-low NO_X emission.

By optimizing the intelligent control scheme of No.3 roller press raw meal finished grinding system, it achieved one key start-stop and APC expert control system for seamless connection, and the whole process adopts intelligent control, which greatly improves the operational efficiency and stability of the equipment, and realizes the unattended control effect of the whole process of the raw meal grinding system.

It introduces the energy management system based on power data acquisition gateway. The SCADA system in the CCR collects the power data of each electrical room by the Ethernet protocol gateway. After being processed by the SCADA data analysis system, it will be provided to the production management department as the basis for production scheduling. The system has the advantages of simple layout, high reliability, perfect security mechanism, flexible expansion, high efficiency and low cost.

Aiming at the difficulty of material level measurement in cement plant under high dust condition, the parabolic antenna radar material level meter and the measurement software of continuous measurement algorithm with missing wave are adopted, which meet the requirements of material level measurement under the conditions of heavy adhesion of materials, strong dust interference and uneven material surface. For some silos that focus on preventing the occurrence of "warehouse-breaking" accidents, an extended anti-rotation switch high-position alarm device can be installed.

Several problems appeared in the company's roller press including the roller bearing temperature is high, side baffle jacking device is highly failed, the extrusion area of side baffle is frequently damaged, the slide valve switch of the roll in press is stuck. Through adding water cooling device on the roller bearing seat, optimizing the side baffle jacking device and extrusion zone structure, transforming the single hydraulic push rod of slide valve switch into double push rod and other technical measures, the operation reliability and work capacity of the roller press are greatly improved.

In view of the problems of high cement outlet temperature and high water demand for cement standard consistency and poor concrete performance caused by dehydration of some gypsum, measures including upgrading and transforming the powder concentrator, adding and adjusting the fan at the first section of the grate cooler, expanding the back blowing aperture of the main dust collector of the cement mill have effectively increased the cement output and reduced the power consumption of the system. The properties of cement have been significantly improved.

Aiming at the aging of 35kV substation equipment, high failure rate, inability to purchase equipment spare parts, and based on fully considering the connection with the current operation mode, the 35kV substation has been technically upgraded. By optimizing the technical reform scheme,upgrading the switchgear, protection, and monitoring system, the power supply reliability of the substation is greatly improved, reducing the risk of unplanned power outages.

Aiming at the problem of poor cooling effect and low heat recovery efficiency of LBTF5500 grate cooler in practical use, we take the measures by adding high pressure fan at the "steps", adopting reverse blowing on the grate bed and so on. The cooling effect of grate cooler has been improved. Clinker temperature of grate cooler has been decreased from 180℃ into 90℃. The modification effect is remarkable.

During the operation of coal mill bag dust collector, several non ventilation faults occurred continuously, and the inlet and outlet pressure difference suddenly increased, which seriously affected the production of coal mill. By reforming the lift valve and pulse valve gas circuit of bag dust collector, replacing the air source triplet, replacing the output signal point of pulse PLC and pulse relay, the non ventilation fault has not occurred again in the operation of coal mill bag dust collector.

The influence factor of clinker mineral composition, such as raw meal, calcination temperature, clinker cooling rate and kiln atmosphere is analyzed. The typical lithofacies structure characteristics and the causes hole, f-CaO, mineral nest are described; the application experience of lithofacies analysis is introduced.

In the process of providing technical services to our customers, many customers give the feedback that the measured strength of the cement tested was always about 3~5MPa lower than that of the cement tested by our company itself. According to the analysis, it is found that the factors affecting the test result of cement strength mainly include the quality of standard sand, the curing condition of cement test sample and the performance index of compression fixture.  The cement strength testing should be carried out in strict accordance with national standards to ensure the authenticity and accuracy of the testing results.

By adjusting the batching plan, using fly ash instead of coal gangue batching, while ensuring the strength of clinker, the raw mill output is increased. The SO₂ emission concentration and the amount of desulfurized ammonia are reduced, the production cost is reduced, and it achieves the purpose of capacity improvement, energy consumption reduction and environmental protection.

On the premise of not increasing the burning heat consumption of cement clinker, by strengthening the process operation of cement kiln, reasonably matching the air volume of primary, secondary and tertiary air, adjusting the proportion of coal used at kiln head, and optimizing the operation of grate cooler, the efficient cooperation between cement clinker production and waste heat power generation system is realized.

This paper analyzes the shortcomings of two conventional technologies in cement projects pyramid structure construction. Through the development of cone template from dismantling equipment and related construction methods, it significantly reduces the difficulty of construction. The self-disassembly and assembly equipment of cone formwork can be applied to the construction of cones of various diameters. At the same time, the central support of the formwork self-disassembly and assembly equipment can be compatible with tower cranes and other components. The self-hanging radian adjustable formwork can not only meet various types of cones, but also can form a self-hanging large formwork system by adjusting the angle of the tripod and the back of the formwork to meet the construction of large-diameter silo wall structures, high kiln piers and other similar structures. 

This paper introduces the type and key point of cable tray in cement plant design. It analyzes the cable tray filling rate calculation and cable minimum turning radius which are the important parameter for cable tray selection. A method for cable tray selection is given according to the standards, contract requirements, etc.