Hydrogen energy replacing fossil fuel to calcine cement clinker is an effective way to save energy and reduce carbon emission in cement industry. Based on the theoretical calculation of thermal engineering, the theoretical combustion temperature and gas volume of different fuels such as hydrogen were analyzed, and a small suspension calcining test platform was built to simulate the combustion state of the calciner, and the feasibility of hydrogen energy replacing fossil fuels in calcining cement clinker was analyzed and verified. Results show that hydrogen has no additional theoretical gas volume compared to conventional fuel. Hydrogen-enriched combustion of coal or alternative fuels has a positive effect on reducing CO and NO_X in suspension calcination, thus promoting the utilization of inferior fuel. As a low-carbon fuel, Hydrogen can further play a high activity to solve the technical bottleneck of incomplete combustion and high NO_X background emission of alternative fuel in the calciner. According to the experimental results, for reducing fossil fuel consumption and carbon emission, the industrialization technical route of 20% hydrogen energy coupled with 60% alternative fuel is proposed to calcine cement clinker. Before this route is applied to practical projects, more in-depth pilot study is needed.

With the deepening of national carbon dioxide reduction work, the cement industry, as an important source of carbon dioxide emissions, has received widespread attention. This article introduces the classification of carbon emission sources and methods of carbon dioxide emission measurement in the cement production process. Carbon dioxide emission sources can be divided into direct emission sources and indirect emission sources, meanwhile methods of carbon dioxide emission measurement mainly include carbon dioxide emission calculation methods and carbon emission online monitoring measurement methods. This article provides an overview of the main technologies for carbon dioxide capture in the cement industry at home and abroad, with a focus on the current application status of oxygen enriched/full oxygen combustion technology in the cement industry. At present, the main technological paths for carbon dioxide utilization in the cement industry include concrete carbonation curing, waste slag mineralization utilization, and preparation of new carbon fixing materials. In the future, the cement industry needs to continue to make efforts in reducing carbon dioxide capture costs, optimizing carbon dioxide emission measurement methods, and efficiently utilizing carbon dioxide resources to further promote the achievement of carbon reduction goals in cement production.

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.

Pyro technology is the key to the large-scale and intelligent development of cement production lines. This article introduces a series of advanced pyro technology equipment, including TX-3 weak vortex low resistance cyclone, third-generation self-denitrification calciner, Sinowalk fourth generation grate cooler, independently developed and designed by TCDRI. Taking the Xuzhou Zhonglian 10 000t/d production line renovation project and the Saudi YAMAMA 12 500t/d production line relocation renovation project as examples, this article introduces the technical solutions for optimizing and renovating using advanced pyro technology equipment. After the renovation, the standard coal consumption of Xuzhou Zhonglian 10 000t/d production line has been reduced to 93kgce/t.cl, the comprehensive power consumption of clinker has been reduced, the heat recovery efficiency of the cooler has been improved, and the NO_X emission concentration of the gas at the outlet of the preheater is ≤ 50mg/Nm³. The renovation has achieved good results. The Saudi YAMAMA 12 500t/d production line relocation and technological renovation project has achieved phased results and is expected to be put into operation in 2025.

A cement production line adopts a cement grinding double loop flow semi-final grinding system composed of RP170mm-140mm roller press and [?]4.2m×13m ball mill. During operation, there are serious problems such as severe wear on the roller surface of the roller press, poor material extrusion effect, severe system crust formation, unreasonable arrangement of connecting air ducts between the powder selection machines, high resistance of the dust collector, and severe reverse grading of the grinding body in the second bin of the ball mill. The system process has high power consumption. By taking optimization measures such as reducing the initial roll gap of the roller press, strictly controlling the moisture content of raw materials, controlling equipment air leakage, adjusting the internal structure and grading of the grinding material, the system crust was improved, the system resistance was reduced, and the production capacity of the grinding system increased from 200t/h to 230t/h. The electricity consumption of the cement production process decreased from 29kW·h/t to 25~26kW·h/t, and the energy-saving and consumption reducing effect was 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 high temperature exhaust gas from the rotary kiln head of the cement production line, after undergoing heat recovery through a grate cooler and a waste heat boiler, is discharged at approximately 100°C. Direct emission of this gas results in significant heat waste. By implementing the Cooler Air Loop System, both heat utilization efficiency and waste heat recovery (WHR) power generation can be further enhanced. Based on the heat balance principles, the input-output thermal equilibrium of the grate cooler was analyzed, and theoretical calculations were performed to evaluate heat variations at the waste heat boiler inlet. The results demonstrated that reintroducing the externally emitted kiln head exhaust into the grate cooler’s cooling air system increases the heat input to the boiler without altering other thermal parameters, thereby improving the steam turbine efficiency and boosting power generation.Taking a 5 000t/d dry-process clinker production line as an example, the design and installation of the Cooler Air Loop System were detailed, emphasizing optimization measures such as rational duct layout and advanced control technologies. Practical application showed that after Cooler Air Loop System implementation, WHR power generation increased by 6.38kW·h/t.cl, while exhaust emissions and thermal pollution were effectively reduced, yielding notable environmental and economic benefits. 

This artical takes a certain dust collection supporting concrete frame which is at 9-degree seismic fortification zone as the research object. A scheme using BRB buckling constrained support dampers for seismic energy dissipation technology, meanwhile another traditional seismic structural scheme is designed respectively for this supporting frame. PERFORM-3D assessment analysis software is used to calculate the elastic-plastic time history seismic dynamic force of the two structural models, and the seismic performance of the two design schemes is compared. The results show that buckling constrained braces have an effective energy dissipation and seismic reduction effect on this supportign concerete frame. The total earthqueke actions and story lateral drift ratio for structures using seismic reduction are distinct lower than non-seismic reduction structures under multiple or rare earthquake.Energy dissipation structure has better seismic performance and greater safety margin.  Compared with non-seismic reduction structures, seismic energy dissipation structure  has less engineering quantity and better economic benefits.

Strengthening compliance management in engineering project construction is a critical measure for mitigating construction risks and enhancing project quality and efficiency. This paper uses a cement production line construction project as an example to define and emphasize the importance of compliance management in engineering projects. It provides a detailed overview of the compliance technology roadmap from preparation to execution, covering essential steps such as risk assessment and management, compliance team establishment, identification of applicable laws, regulations, and standards, formulation of compliance policies and procedures, compliance training and education, as well as the establishment of monitoring and review mechanisms. Following the implementation of this compliance roadmap, the project achieved zero safety or quality incidents and no work stoppages or rectifications, while also advancing the clinker production timeline by half a month. This effectively enhanced project quality and safety, strengthened stakeholder trust, and underscored the critical role of compliance in ensuring that project goals and long-term value are met.