At present, developing low temperature, high activity, high stability and low cost catalysts is the key research direction of CO-SCR technology. This paper mainly introduces the catalytic reduction mechanism of CO-SCR technology, and reviews the research progress of CO-SCR catalysts at home and abroad in recent years, starting with noble metal catalysts and transition metal oxides catalysts. Numerous studies have shown that CO-SCR catalysts still have many limitations. To achieve large-scale industrial applications, further theoretical calculations need to be combined to improve the antioxidant performance of the catalyst, and the detailed influence paths of factors such as H2O, SO2, and alkali metals in CO-SCR reactions need to be analyzed.

Hydrogen energy has the characteristics of clean and pollution-free, high energy density per unit mass, etc., and is regarded as one of the most promising clean energy in the 21st century. Its application in cement, thermal power, automobile and other fields has become the focus of technical research in various countries. The development status of hydrogen energy in cement industry at home and abroad is mainly the direct combustion of hydrogen as fuel to generate energy and the combined use of hydrogen and carbon utilization technology (CCUS). The key of hydrogen direct combustion technology is to increase the substitution rate of alternative fuels to fossil fuels by adding hydrogen. The key to the combined use of hydrogen and CCUS lies in the capture of CO2 and the development of high efficiency catalyst for the hydrogenation of CO2 to methanol. Combined with the existing spontaneous combustion, early combustion, tempering, NOX emissions of hydrogen energy combustion in the hydrogen internal combustion engine, gas turbines and other industrial fields, the current development situation and future trend of hydrogen energy in our cement industry are analyzed.

Cement grinding system is currently in the stage of transformation from automation to intelligence in China. Many intelligent technologies have been applied in the aspects of system intelligent operation, product quality monitoring, equipment maintenance, on-site monitoring and management, etc., however, there is still a distance from the full process intelligence of the cement grinding system. Aiming at the intelligent realization path of cement grinding system, the idea of transforming from intelligent operation mode to smart operation mode is proposed, and through the realization of digital management of the whole life cycle from design to operation and maintenance, intelligent regulation of grinding production and operation process, a composite intelligent operation control system and equipment dynamic management system based on neural network multi-variable model are established. In combination with intelligent production modes such as adjusting particle size distribution and classification respectively grinding system etc., it will work together from both software and hardware to achieve the intelligence of the cement grinding system in the smart operation mode of the whole process in multiple ways.

Magnesium phosphate cement has a short setting time and high early strength, and has broad prospects in civil buildings such as airport runways, tunnels, mines, and emergency repairs of national defense projects. However, magnesium phosphate cement hydrates very quickly and has a very short setting time, resulting in the inability to carry out engineering construction. This article summarizes the new achievements in the influence of factors such as raw materials, retarders, and admixtures on the setting time of magnesium phosphate cement at present, as well as new measures to improve the compactness, adhesion, and frost resistance of magnesium phosphate cement. It also looks forward to the development prospects of magnesium phosphate cement.

Based on the operation data of ?4.8m×74m rotary kiln, it briefly descrbes the measuring method of the clearance between the kiln tyre and the backing plate by measuring the thermal expansion and slippage, and the impact of clearance size on the operation of rotary kiln and its adjustment measures. Excessive clearance between the kiln tyre and the backing plate would easily cause the breakage and fall-off of the refractory bricks and shorten its service life, while too small clearance would easily cause uneven thermal expansion of the rotary kiln and result in the "necking" phenomenon, which would seriously affect the safe operation of the kiln. By strengthening the lubrication and maintenance, adjusting the thickness of the backing plate, replacing the backing plate, etc., the clearance between the kiln tyre and the backing plate could be ensured within a reasonable range, which reduce costs of kiln maintenance, and further improve the operation rate of the rotary kiln.

Through the application of digital intelligent control technology, the on-line monitoring of grate cooler layer thickness, automatic adjustment of grate bed travel and speed, iterative optimization of multi-variable intelligent control module, intelligent control of clinker moving speed, cooling air volume and air pressure, intelligent maintenance of grate cooler is realized, which improves the reliability of grate cooler operation and reduces the maintenance cost. The clinker production quality is stabilized and the management level of cement production enterprises is improved.

Aiming at the technical bottleneck of energy efficiency improvement of CUCC(Xuzhou)
10 000t/d production line Ⅰ, a solution of pollution reduction and carbon reduction of pyro system was proposed. The five-stage preheater was changed to six-stage preheater for the first time in chinese cement industry. The calciner volume was expanded and self-denitrification technology was adopted to improve the efficiency of the main combustion area, the speed of rotary kiln was accelerated, and the cooler was changed to the fourth-generation cooler with middle roll crusher. After the transformation, the outlet temperature of the preheater is reduced by 83℃, the standard coal consumption of clinker is reduced by about 14kg/t.cl, the comprehensive coal consumption per unit product of clinker reaches and is lower than the level 1 index of GB 16780-2021 standard by about 4%, 43 000 tons of standard coal is saved every year, and the annual carbon dioxide emission is reduced by 108 000 tons. Meanwhile, the emission reduction technology of self-denitrification source is applied in the existing preheater tower. The NO_X emission is lower than 25mg/Nm³ required by the local environmental protection department, the ammonia consumption is reduced by 10 000 tons, and provide a technology demonstration for the new upgrading of cement manufacturing under the double carbon strategy background, double control of energy consumption and ultra-low emission targets.

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.

With the development of the roller press combined grinding system, the internal structure of the ball mill suitable for this system should be optimized. With the optimization and modification of the feeding device, the liners structure, the intermediate diaphragm, the dam ring, and the heat-proof material, the operation efficiency of the ball mill is effectively improved and the energy consumption of the ball mill is reduced.