This paper systematically analyzes the research progress of typical CCUS technologies worldwide, including oxy-fuel combustion, chilled ammonia absorption, membrane separation, calcium looping technologies, etc. It focuses on the research outcomes of the Qingzhou Zhonglian oxy-fuel combustion coupled carbon capture demonstration project. The Qingzhou Zhonglian demonstration project achieved efficient carbon capture in cement production through full oxy-fuel combustion technology, overcoming key technical challenges such as high-oxygen concentration flame control, CO₂ enrichment concentration, and meal calcining rate under high CO₂ concentration conditions, through innovative methods such as graded oxygen supply and discrete dilution combustion, the energy consumption and cost of carbon capture have been significantly reduced. The research indicates that oxy-fuel combustion technology can increase the CO₂ concentration in flue gas to over 80%, laying a foundation for low-energy physical carbon capture. The successful operation of the Qingzhou Zhonglian demonstration project provides an important example for the industrial application of low-carbon technologies in the cement industry.

The conventional waste incineration fly ash disposal technology generally has the problems of high energy consumption, high cost, and the need for further disposal of the generated secondary fly ash. The generation mechanism of dioxins in waste incineration flue gas and the definition of waste incineration fly ash as hazardous waste were analyzed. The traditional typical flue gas purification technology route of “SNCR + semi dry process + dry process + activated carbon injection + bag filter + SCR denitrification” was introduced, and a new technology route that can significantly reduce the reduction of hazardous waste in the process of waste incineration flue gas purification was proposed. By adding a high-temperature electrostatic precipitator in the high-temperature section of the waste heat boiler, the dust collection of a single bag filter is increased to three-stage dust collection. The high-temperature electrostatic precipitator collects dust as solid waste, the first stage bag filter collects dust as hazardous waste, and the second stage bag filter collects dust as solid waste, significantly reducing the production of hazardous waste. The economic analysis of a 1 000t/d waste incineration power plant in Zhejiang Province before and after applying two technical routes shows that after adopting the new technology route, the reduction of hazardous waste reaches 84.37%, and the annual treatment cost is reduced from 6.384 million yuan to 0.7 million yuan, with significant economic benefits.

In view of the unreasonable configuration of ball mill grinding body in cement grinding system and the high power consumption of main motor caused by the long-term low speed operation of the mill, energy-saving technology transformation was carried out. By replacing part of the steel ball grinding body in the second bin of the ball mill in the cement grinding system with ceramic balls, and adding frequency converter to the main motor to precisely control the speed of the ball mill, the working efficiency of the ball mill is improved and the energy consumption is significantly reduced. After the technical reform, the current of main motor and the temperature of cement grinding are significantly reduced, and the quality of finished cement is stable. At the same time, after using the frequency converter， the output of the ball mill increased by about 40t/h, and the single consumption of the main motor of the ball mill decreased by about 1.3kW·h/t, electricity costs was saved by about 1.06 million yuan every year, and the investment recovery cycle is 1.01 years.

Considering the increasingly strict national standards for air pollutant emissions, many cement plants adopt kiln ash-gypsum wet desulfurization systems to achieve efficient desulfurization. However, the conventional kiln ash-gypsum wet desulfurization system has problems such as complex material balance and water balance process flow, high investment and operating costs, and large footprint. An optimization scheme based on the conventional kiln ash-gypsum wet desulfurization process is proposed, which simplifies the desulfurization process by eliminating the first and second stage gypsum dehydration equipment and corresponding supporting facilities. The accident slurry is directly transported to the grate cooler, achieving the simplification of material balance and water balance process flow. In addition, in this optimization plan, the accident slurry tank has added the function of spraying slurry into the grate cooler at the kiln head. The slurry flow rate can be monitored by a flowmeter to adjust the material balance. Taking a domestic 5 000 t/d clinker production line as an example, this optimization plan reduces the one-time investment by about 0.9 million yuan and can save operating costs of 0.173 5 million yuan per year. The economic benefits are significant, and the impact on kiln head exhaust gas and clinker quality is relatively small.

The DCS system plays an important role in the continuous and stable operation of the cement production line, in which the Com power supply provides a common voltage for the digital signal input and is an indispensable component to ensure the normal operation of the DCS system. Com power short circuit failure is a typical DCS field electrical circuit failure, which is mostly caused by the short circuit of the digital signal circuit input on site to the ground, which can easily cause the Com power fuse in the DCS control cabinet to blow, thereby causing the digital input signal to be lost. This paper analyzes the Com power short circuit failure cases caused by speed switches, deviation switches, limit switches and DC power supplies, by prohibiting the DCS system Com power supply from directly connecting to the production site, configuring a circuit breaker with a suitable rated current and adding an isolation relay, the Com power supply in the DCS control cabinet is effectively isolated from the production site, reducing the impact of the DCS system Com power short circuit failure on cement production, eliminating the hidden dangers of failures, improving the stability and continuity of the production line operation, and providing a solid guarantee for the efficient operation of cement production.

A 5 000t/d cement clinker production line is equipped with a 9MW waste heat power generation system, which uses two 4-stage (4 magnetic poles) 10kV high-voltage motors to drive an old-fashioned horizontal double suction circulating water pump. There are problems including high circulating water pump speed, low energy efficiency, high power consumption, vulnerable mechanical seals, and high maintenance costs. By evaluating the thermal performance of the end heat exchange equipment of the circulating water pump, analyzing the performance parameters of the cooling tower, applying the “Three Element Flow Theory” and using CFD simulation technology for flow field simulation analysis, a new “3+1” high-efficiency fluid energy-saving circulating water pump is designed for technical transformation, and a 6-stage (6 magnetic poles) low speed (980r/min) high-voltage motor is replaced with a set. After the technological transformation, the hourly power consumption of a single circulating water pump can be reduced by about 71 kW/h, saving about 0.24 million yuan in electricity bills per year. The mechanical seals and bearings of the circulating water pump and motor are replaced less frequently, and the equipment maintenance costs are significantly reduced. The energy-saving effect and economic benefits are significant.

Ultrafine slag powder exhibits superior reactivity and is a critical component in concrete preparation. To meet the production requirements of TRMS 45.2 vertical roller mill slag grinding ultrafine slag powder, a technical transformation was implemented. This paper introduces the grinding process and main equipment configuration of the TRMS 45.2 slag vertical roller mill. During the transformation, high-efficiency cage rotors and an innovative static blade structure were adopted. The grinding area adjustments included modifying the liner plate angle, roller sleeve angle, roller sleeve corner radius, retaining ring height, and air ring area. Issues such as significant mill vibration, poor production stability, and non-compliant specific surface area of finished products encountered during production and commissioning were analyzed. Additionally, the influence of operational parameters including mill roller working pressure, powder separator speed, mill vibration, material layer thickness, mill air temperature, and mill air volume on production performance and parameter determination was evaluated. By optimizing the production process parameters, system power consumption was reduced to approximately 64kW·h/t, achieving transformation goals of producing 60t/h of ultrafine slag powder with a specific surface area of at least 600m²/kg and ensuring stable production operations.

The abrasive wear of the roller coating of belt conveyor will lead to slip and heat phenomenon, and even cause burning and other safety accidents. In this paper, it is analyzed that timely handling can protect the roller and save maintenance cost; comparing the process flow of hot vulcanization and cold vulcanization, the cold vulcanized gluing technique needs short construction time and low cost, is more suitable for on-site maintenance. Taking the engineering project as an example, the paper introduces the preparation, main technical parameter requirements and construction treatment steps of the cold vulcanized gluing technique, and puts forward the precautions of construction. After implementation, the service life of the belt conveyor roller is effectively improved, the maintenance cost is significantly reduced, and the work load of the staff is reduced.

Water leakage accidents in cement kiln waste heat power generation AQC boilers can easily lead to their failure and shutdown, affecting the safe and stable operation of steam turbines and cement production lines. It analyzed the common risks of wear leakage, corrosion leakage, and thermal fatigue leakage caused by alternating cold and hot stresses in the superheaters of AQC boilers. Taking the single pressure system AQC boiler of a certain project as an example, multiple experimental analyses were conducted on the sampling of the outlet header of the high-temperature superheater and the spray pipe of the desuperheater that experienced water leakage. The results showed that the main cause of superheater leakage was thermal fatigue leakage caused by alternating cold and hot stresses, and the main cause of desuperheater nozzle cracking was corrosion fatigue. Based on the experimental results, the leaking equipment was replaced, and design optimization schemes were proposed to enhance the adaptability of the boiler, optimize the steam drum and water separator, strengthen boiler wear prevention, and reduce stress concentration in welding parts. By adopting multiple measures such as strict control of welding quality, strengthening of equipment manufacturing process quality control and on-site equipment construction quality supervision and inspection, and improving boiler operation management level, the high leakage risk of the AQC boiler superheater can be effectively prevented, ensuring the long-term stable operation of the AQC boiler.

This study analyzed the issues existing in traditional manufactured aggregate production lines, such as suboptimal particle morphology of the products, cumbersome processes, high investment costs, and significant losses of fine sand and mud powder in the wet sand-making process. Taking a project of thin-bedded limestone and dolomite mine as an example, a dry-process aggregate production line with an annual output of 5 million tons was constructed using low-grade limestone and high-magnesium dolomite, achieving efficient utilization of mineral resources. The dry process is introduced, which acquires different particle sizes of soil-containing stone chips, crushed stones for sand-making, and 10~20mm high-quality aggregates through two-stage crushing and multi-level screening. Among them, the 0~15mm crushed stones for sand-making are further processed by a vertical roller mill grinding system to yield high-quality manufactured sand, while the 0~5 mm soil-containing stone chips are processed by a dry washing and column crushing sand-making system to produce ordinary manufactured sand. The comparison reveals that the vertical roller mill grinding products outperform the column crushing making products in terms of quality stability, particle size distribution, and morphology. The performance of concrete is comparable to that of natural sand, with lower costs, meeting the green development requirements of the sand and gravel industry and having broad application prospects.

In order to promptly detect quality fluctuations and potential production hazards that occur during the cement production process, an intelligent quality control system has been developed. This system mainly consists of a sample sending device, a central laboratory, a computer control center, an auxiliary laboratory, etc. It integrates advanced technologies such as mobile communication networks, data sensing and monitoring, information interaction and integration, and adaptive control. Through integration with the quality management system, it realizes the automatic sampling, sending, testing, proportion adjustment, and waste disposal of samples for automated inspection. The application scenarios of the intelligent quality control system in raw material detection and proportion optimization, real-time product quality monitoring, equipment failure prediction and maintenance, quality problem tracing, as well as its application effects and difficulties in application are introduced. Ways to improve the data analysis ability of the intelligent quality control system are also proposed.

Taking a limestone quarry as the research object, the 3D geological deposit database and block model were built by Surpac software. Based on the principles of geostatistical analyst, the structure model of the reasonable variation function is built after basic statistical analysis and spatial autocorrelation of regionalized variable research through the spatial interpolation method. The grade and reserves of the deposit are estimated with the Ordinary Kriging method. Grade variation of the ore body in Z direction is drawn and used to verify and evaluate the model itself. The verifying result shows that the model is reliable and the estimation is relatively accurate which is structured and estimated by Ordinary Kriging. The Ordinary Kriging method can provide scientific grade estimation for the future development of the deposit.

Dry Reforming of Methane (DRM) technology is one of the technologies for CO₂ resource utilization, the application of Ni-based catalyst can reduce the energy of DRM reaction. The research analyzes the reaction mechanism of Ni-based catalysts during the DRM reaction process, as well as the cause of the reasons for the loss of Ni-based catalysts such as carbon, metal activated component sintering, sulfur poisoning, etc. This paper describes the research results of currently improving the catalytic performance of Ni-based catalysts, and provides a research direction for the future development of Ni-based catalysts with high stability, selectivity, activity, and resistance to carbon deposition. And it provides theoretical guidance and research basis for the industrial application of Ni-based catalyst in DRM.

The experimental principle for detecting the content of water-soluble chromium (VI) in cement was studied. The absorbance of the complex formed by the chromogenic reagent and water-soluble chromium (VI) in an acidic solution was measured by a spectrophotometer, which could indirectly calculate the content of water-soluble chromium (VI) in cement samples. Experiments were conducted using cement standard samples and control samples with different water-soluble chromium (VI) contents to investigate the effects of chromogenic reagent mass, pH value of the experimental solution, acid adjustment time, post-coloration standing time, and experimental temperature on the accuracy of the determination results. The results showed that different masses of chromogenic reagent led to different accuracies of the determination results; a pH value that was too high in the experimental solution would cause negative errors in the measurement results, while a pH value that was too low had little effect on the determination results; the acid adjustment time of the experimental solution should be controlled within 30 seconds, and the standing time of the experimental solution after coloration should be between 15 and 20 minutes; within a certain range, the experimental temperature had little effect on the determination results of water-soluble chromium (VI).