Cement Technology

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Development Status and Trend of Hydrogen Energy in Cement Industry under Background of Carbon Peaking and Carbon Neutrality

LI Huajun, YANG Huanying, MA Jiaomei, ZHAO Liang, WANG Jiashuo

Cement Technology 2023, 1 (3): 15-24. DOI: 10.19698/j.cnki.1001-6171.20233015

Abstract

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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.

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Research Progress of CO-SCR Denitration Catalyst at Home and Abroad

ZHAO Lin, HAN Hui, DU Liangbo, YANG Huanying, PENG Xueping

Cement Technology 2023, 1 (4): 19-27. DOI: 10.19698/j.cnki.1001-6171.20234019

Abstract

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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.

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Development Status and Optimization Approach of Intelligent Cement Grinding System

SHI Guoping, LIU Dongqiang

Cement Technology 2023, 1 (5): 13-17. DOI: 10.19698/j.cnki.1001-6171.20235013

Abstract

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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.

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Application Practice of New Aerogel Nano Thermal Insulation Material in Cement Production Line

ZHAN Jiagan

Cement Technology 2023, 1 (5): 86-90. DOI: 10.19698/j.cnki.1001-6171.20235086

Abstract

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A new type of nano-insulated aerogel felt and aerogel plate were used for demonstration application in the area of secondary air duct of 5 000 t/d cement production line. By summarizing the preparation and performance of aerogel nano-insulation materials, comparing the surface temperature changes of the cement kiln three air pipe equipment before and after using aerogel materials, and the differences between aerogel materials and ordinary thermal insulation materials in terms of construction scheme, thickness of thermal insulation layer and thermal insulation performance, it is clarified that aerogel nano-insulation materials can show better thermal insulation performance under thinner laying conditions. It can effectively reduce the surface temperature and heat dissipation of cement kiln equipment, and provide a new path for energy saving and consumption reduction in cement industry.

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Cement Property Analysis by Infrared Spectrometer

PENG Chunyuan, ZHAO Hui

Cement Technology 2001, 1 (4): 63-65.

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Analysis and Solution Measures on the Wear Mechanism of SCR Catalyst in Cement Kiln

PENG Xiaoping, WANG Yonggang, CHENG Zhaohuan, TANG Xinyu

Cement Technology 2023, 1 (3): 32-37. DOI: 10.19698/j.cnki.1001-6171.20233032

Abstract

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During the operation of the SCR denitrification system in the cement kiln, the problem of rapid wear of catalyst apparent gradually. The main reasons for catalyst wear in the cement kiln SCR system include high dust content, irrational original design, uneven flow field caused by dust blockage, irrational blowing system, and poor wear resistance of the catalyst itself. Through theoretical analysis, the biggest influencing factor for catalyst wear is the flue gas flow rate, which is related to the cubic power of the flue gas flow rate. To alleviate the problem of rapid catalyst wear, it is usually solved by selecting a reasonable catalyst, increasing the resistance to wear performance of the catalyst itself, designing a reasonable reactor flow field by conducting numerical simulations, improving the catalyst service environment, and adopting a reasonable soot blowing system. This ensures the stability of the SCR system and meets the environmental requirements of ultra-low emissions.

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Energy Saving and Consumption Reducing Modification for Pulverized Coal VRM Grinding

LIU Di, DU Xin, WU Xiao, LIU Chang

Cement Technology 2023, 1 (3): 50-55. DOI: 10.19698/j.cnki.1001-6171.20233050

Abstract

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According to raw coal characteristics, in order to solve the problems of pulverized coal grinding system of high resistance, low separator efficiency, high system power consumption and insufficient capacity of supporting kiln, a new moving blade and static blade, sealing structure and VRM pressurization rod are developed and designed. After modification, pulverized coal cyclic load inside VRM is reduced and obtain 500~1 000Pa low for system resistance. Those effects make the system power consumption reduced by 2.0~4.0 kW·h/t, and the mill output increased by 10%~20%, ensuring kiln higher efficient operation.

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Study on Calcining and Preliminary Application of New Low Calcium Cement

YAO Piqiang, HAN Hui, YU Weimin

Cement Technology 2018, 1 (2): 17-25.

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Research Progress on Effect of Fluoride Containing Sludge on Setting Time of Clinker

FENG Yun, LI Zhen, ZHANG Wentao, LI Jia, ZHAO Feng

Cement Technology 2023, 1 (3): 91-96. DOI: 10.19698/j.cnki.1001-6171.20233091

Abstract

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The setting time of the cement produced by the proportioning of fluoride containing sludge will be prolonged in the use process. The use case and relevant test results in the precalciner kiln show that the setting time of the clinker can be effectively improved by properly adjusting the three ratio value of clinker and the amount of fluoride containing sludge in the production process of clinker, reasonably controlling the content of Fe2O3, F- and CaSO4 in the raw meal, and controlling the mineral composition of the clinker. If fluoride sludge is stably used in cement kiln for collaborative disposal and production of clinker, about 72 million tons of fluoride sludge can be disposed annually according to the current actual cement production capacity, with significant energy saving and emission reduction effect.

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Design Optimization and Application of a New Generation of Medium Crushing Impact Crusher

WANG Ping, LI Hongshuang, TIAN Songge, ZHANG Zhe, LIU Xiaowei

Cement Technology 2023, 1 (4): 34-42. DOI: 10.19698/j.cnki.1001-6171.20234034

Abstract

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The first generation of medium crushing impact crusher has some problems, such as high discharge grain type pin degree, inconvenient adjustment of impact plate and uniform plate protection device, low reliability of uniform plate protection device, improper shell split surface and structure setting leading to high transportation cost and poor installation adaptability in small space. The new generation TKPFM type medium crushing impact crusher has improved the main structure of the levelling plate, changed the original flat lining plate of the material contact surface into a serrated rack, and improved the grinding levelling efficiency of the material. The adjusting structure of the mechanical counterattack plate and the mechanical adjustment and protection device of the whole plateis changed to the hydraulic type , which not only shorts the adjustment time, but also improves the reliability of the protection of foreign matter.The side and end of the shell are changed from welded structure to bolted connection, and the section surface is re-optimized, which reduces the maximum bulk unit weight ratio of the equipment after disassembly, and makes transportation and installation more convenient. The actual application of many projects shows that the new generation of TKPFM type crushing impact crusher has better performance, more convenient operation and maintenance, low transportation cost and stronger installation adaptability.

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