This paper introduces the system configuration and operational status of a 5 000 t/d cement clinker production line that was converted from a vertical mill system to a roller press raw material finish grinding system. Due to adverse factors such as high material moisture content, low preheater exhaust gas temperature, severe caking in the stable flow bin, and low separation efficiency of the powder separator, the roller press raw material finish grinding system deviated from the design targets in terms of output and power consumption during the initial production phase. By implementing optimization measures such as enhancing insulation treatment, installing dust collection pipelines, improving the feeding chute, reasonably selecting the roller press control mode, adding bypass hot air, increasing the hot air temperature entering the V-type powder separator, widening the feed device discharge port, and improving material fluidity the average hourly output of the raw material finish grinding system increased by 100~120t/h compared to the original vertical mill system, and power consumption decreased by 4~5kW·h/t, achieving the goal of energy saving and consumption reduction.

Manual visual inspection and regular inspections with measurement tools by opening the cover to check the roller surface wear of roller press have many issues, such as significant observation errors and delayed discovery of abnormal conditions. To achieve unmanned fine-grained monitoring and management of the surface for roller press and extend the service life, a set of the roller surface wear monitoring system for roller press has been developed. This article introduces in detail the technical principles of the surface wear monitoring system for roller press. The system utilizes laser scanning 3D reconstruction technology to create a 3D digital twin of the roller surface, automatically identifies abnormalities on the surface, has high detection accuracy, and is not easily influenced by the surface texture. It realizes the digital mapping of the roller surface for roller press, a core component of the roller press, for the first time. Application practices have shown that the system can visually detect cone defects in roller surface repairs, identify the condition of roller surface pins and pit defects, and has significant application effects, effectively improving the intelligent level of roller press.

There is a problem of intensified axial vibration of the drive end bearing in the high-temperature fan of a 5 000t/d cement clinker production line. The diagnostic process of vibration fault detection technology is introduced. By using a multi-channel vibration detection analyzer detection technology, 12 vibration detection points, including the high-temperature fan, motor, and fan drive end, non-drive end horizontal, vertical, and axial positions, were determined. The vibration rates of each detection point were collected and a frequency spectrum was generated. Through spectrum distribution diagnosis analysis, it is found that the large axial vibration at the driving end of the high-temperature fan is mainly caused by production process reasons such as wind pressure back pressure impact and initial cracking of the cement foundation. After removing some louver valves and replacing the filter bag of the kiln tail bag dust collector, the axial vibration value of the bearing at the driving end of the high-temperature fan returned to normal.

The article introduces the development process and main uses of domestic pan conveyors, as well as the development difficulties faced at present. The future trend of domestic pan conveyors to intelligent production, operation and maintenance, green design and manufacture, international market and foreign trade development is reviewed in this paper. This will help further improve the product utilization and production efficiency of domestic pan conveyors, reduce raw material costs and safety hazards, and enhance market competitiveness.

Liquid gas rock breaking technology uses pure liquid oxygen or a mixture of liquid nitrogen and oxygen, which undergoes physical phase transformation, gasification, expansion, and work to break rocks. It is a new type of mining rock breaking technology. Taking a cement raw material mine as an example, combined with the geological conditions, production status, and the law of liquid gas phase change energy conversion of the mine, the technical parameters and construction methods for rock breaking operations are determined, and the application experiments are carried out. The evaluation of rock breaking effect testing shows that this technology has a high rock breaking efficiency, and the secondary harmful effects such as vibration, noise, and flying stones brought about during the implementation process are smaller than those of explosive blasting. There are no toxic and harmful pollutants produced, and it is more economical than mechanical rock breaking methods.

Mine shaft is the key to the mine development system. This paper analyzes the problems of poor stability of the surrounding rock of the shaft wall, high water content of ore and rock, easy compaction of materials, and easy formation of wellbore collapse and plugging during blasting. The optimization scheme of arranging double inspection shaft roadway and preventing chute blockage is proposed, and the construction plan of "additional inspection lane + middle section reverse excavation" is adopted. After the implementation, the double inspection roadway spirals up and is arranged in sections around the wellbore of the pass, which is convenient for the inspection during the operation of the pass and the effective treatment measures after the plugging of the well, which can effectively block the groundwater channel and reduce the water damage during the operation of the pass, and the inspection roadway can be used as a ventilation roadway.

When the sand and gravel aggregate production line adopts a mobile belt conveyor automatic loading system for loading, the mobility of the belt conveyor makes it difficult to effectively arrange the dust collector, resulting in poor dust removal effect. The mobile ventilation duct moves with the belt conveyor can convert mobile dust removal into fixed dust removal, achieving efficient dust removal during loading. This article introduces the production process of the automatic loading system of the mobile belt conveyor, the structure and working principle of the mobile ventilation groove, and the selection design of air volume and air pressure for dust removal. When using a mobile ventilation duct for dust removal in the loading system, the gas velocity of the mobile ventilation duct should be controlled at 20~22m/s, and the gas pressure of the dust removal fan should be more suitable than 4000Pa. In practical applications, equipment sealing should also be strengthened, and regular dust cleaning treatment should be carried out.

This introduces the development history of modular technology in the engineering field and the current development status of cement grinding stations. It compares and analyzes the similarities and differences between traditional grinding stations and modular grinding stations, and focuses on introducing the construction scheme of modular batching station design and modeling, factory prefabrication, and equipment integration in cement grinding stations. All structures and equipment of the modular batching station adopt the box integration method. They are finished products when leaving the factory, without the need for on-site production. They are convenient for transportation, quick to install, simple to maintain, and can be applied to different regions and climates, with wide applicability.

Green and Intelligent mines are the current trend in mine construction. This paper proposes an overall construction of digitalization and infrastructure for a green and intelligent mine, supported by the high transmission rate of 5G networks and clean energy storage from photovoltaic power generation. The plan focuses on the main production lines of drilling, blasting, loading, and transportation in mining areas. It integrates advanced technologies such as digital information technology, Beidou and GPS positioning technology, and 3D simulation technology into traditional mining enterprises. By building intelligent remote control for mining machinery with "oil-to-electric" conversion, constructing basic communication facilities like 5G private networks, internal local area networks, and wireless ad hoc networks, and developing software and hardware for the information center and photovoltaic energy storage power projects, the goal of green and intelligent mining can be achieved.

With the rapid development of 5G communication technology and artificial intelligence technology, 5G + AI technology has been gradually applied to the safety protection system in the cement industry. Focus on the cement production safety intelligent management system organization structure and functional partition, the system based on 5G private network, relying on the AI intelligent video analysis technology, Bluetooth positioning technology, intelligent positioning video helmet and intelligent entrance control system, implements the personnel into the factory control, key equipment safety status monitoring, dangerous work with video and remote supervision factory safety supervision of full coverage and intelligent, effectively enhance the level of cement enterprise safety supervision.

Taking the large-scale bag filter at the preheater of a 10 000 t/d cement production line as an example and carry out CFD simulation based on the boundary contour method technology. Analyzing the calculation results, we put forward the correct optimization structure, and improve equipment operation status. Firstly, the calculation steps of the boundary contour method were introduced. Secondly, numerical simulations were conducted on the entire machine and single bag chamber of the equipment to analyze and compare the distribution of flow volume in each bag chamber, and using the boundary data of the corresponding bag chamber inlet, calculate and analyze the flow field state of the single bag chamber, and propose a reasonable plan to optimize the internal structure. Simulation analysis found that arranging high-efficiency guide plates at the ash hopper and reasonably arranging grid plates on the side of the filter bag are the optimal structural optimization solutions for the bag filter. Application practice has shown that using the boundary contour method based on CFD numerical simulation technology can accurately simulate the internal airflow state of equipment with complex structures and multiple components, ensuring that the equipment achieves good operating conditions.

This article compares the advantages and disadvantages of various clean energy power generation methods applied in cement plants. It introduces the layout of photovoltaic panels， the application of monocrystalline silicon solar cell modules， and the grid connection method of photovoltaic power generation systems with a capacity of 9.2MW. The average annual power generation within a 25 year lifespan is calculated to be 9 504MW·h; The power generation method of the waste heat power station uses the waste heat from the middle section of the clinker cooling machine， with an installed capacity of 7.5MW; The wind power generation method utilizes the natural conditions of high in the north and low in the south in the area， and arranges two units with a capacity of 9.1MW in the factory area. A centralized wind farm with a capacity of 40.95MW is planned in the surrounding area. In addition， the conventional application of waste incineration power generation method was introduced， and the idea that cement enterprises need to plan and layout the hydrogen energy industry in advance was proposed， providing ideas for achieving "zero electricity purchase" in cement factories.

A certain 4 500t/d clinker production line in China the raw mill is TRM53.41. There are problems such as air leakage, large particle size of limestone, low efficiency of circulating fan, and high dam ring in this raw mill. The energy saving modification were including upgrading the sealing between the grinding roller and the shell, as well as the sealing of the expansion joint, installing the “Stable” mill inlet feeder and strengthen material level control, and installing unpowered flap valves at the rejected material chute for air leakage control; as well as, taking measures such as adjusting the particle size of raw materials such as limestone and sands, replacing energy-saving fans, shortening the height of the dam ring, and replacing new low resistance nozzle ring for energy-saving technical reformation. After the reformation, the vibration of the vertical mill decreased, the negative pressure of the incoming mill decreased from 760Pa to 450Pa, and the raw mill system power consumption reduced by 2.2kW·h/t. It achieved significant improvement in economic benefits.

The top of the clinker warehouse in a 5 000t/d cement clinker production line has problems such as poor sealing, large internal dust, and high environmental temperature. There are problems with the two sides and bottom of the inclined zipper machine corridor, such as inadequate sealing, serious material leakage and ash emission. The renovation was carried out by installing a dust collector at the discharge port of the inclined zipper machine, sealing the kiln head inclined zipper machine corridor and the outdoor area of the clinker warehouse roof with color steel tiles and structural glue, and installing a conical aggregate hopper, rod valve, and receiving hopper at the end of the inclined zipper machine corridor above the ground level.  After the renovation, the dust and leakage control effect of the top of the clinker warehouse and the inclined zipper machine is good, the environmental temperature of the top of the clinker warehouse is significantly reduced, and the equipment failure rate is greatly reduced.

By selecting raw materials with low alkali content, using high silicon content raw materials, improving clinker calcination process, and reasonably controlling cement grinding indicators, a low alkali and high silicon content medium sulfate resistant cement with cement alkali content<0.30%, 14d linear expansion rate<0.030%, clinker tricalcium aluminate<4.0%, and SM (silicic acid rate) of about 3.50 has been developed and produced, meeting the quality requirements of special cement for underground concrete structures in areas with high alkali and sulfate content in hydraulic concrete.

In order to further improve the comprehensive utilization rate of industrial solid wastes such as slag, steel slag, and fly ash, it selected slag, steel slag, fly ash, and alkali equivalent as influencing factors, and used the 28d compressive strength and compression-fold ratio as response values. The surface response method was used to optimize the raw material mix ratio of alkali-activated slag-steel slag-fly ash composite cementitious materials. Through regression equation fitting analysis and response surface analysis, the influence of each influencing factor on the performance of the alkali-activated material was revealed, and the optimal raw material mix ratio was determined on this basis. The research results show that when the slag content is 60%, the steel slag content is 20%, the fly ash content is 20%, and the alkali equivalent is 6%, and then, the 28d compressive strength and compression-fold ratio of the alkali-activated material reach 47.8MPa and 7.4MPa respectively. The prepared material exhibits high strength and low brittleness, and has excellent overall performance.

When a cement company used X-ray fluorescence analyzer to detect SiO2, CaO and other components of raw material samples, the detection data frequently exceeded the error phenomenon. The factors that may cause the error of X-ray fluorescence analyzer test data were analyzed, and the effects of operation error and instrument error were excluded in the test. It was found that the main reason for the error of test data was the poor repeatability of sample preparation method. The factors affecting sample preparation were further investigated, and the influence of particle effect on the error of test data was determined. By grinding the sample to pass the 0.08mm square screen, the problem of X-ray fluorescence analyzer was solved and the quality of clinker was improved.