Cement Technology

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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 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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Cement Property Analysis by Infrared Spectrometer

PENG Chunyuan, ZHAO Hui

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

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Research Progress of Magnesium Phosphate Cement

LIU Ruinan, WANG Liyan

Cement Technology 2023, 1 (3): 87-90. DOI: 10.19698/j.cnki.1001-6171.20233087

Abstract

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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.

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Renovation of the Drive System of Rotary Kiln on 10 000t/d Cement Production Line

WANG Kexue, JI Liang, WANG Mingqian

Cement Technology 2023, 1 (3): 67-70. DOI: 10.19698/j.cnki.1001-6171.20233067

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The original drive system of ?6m×90m rotary kiln equipment of 10 000t/d cement production Line used in Xuzhou CUCC could no longer meet the requirement of company's cost reduction and efficiency demand, energy conservation and emission reduction. Based on this problem, the rotary kiln will have a maximum speed of 5r/min by reselecting the gearbox, while maximum keeping the installation size of drive system consistent. Through the optimization design of the lubricating oil station, the problems of insufficient cooling and lubrication of gearbox and high oil temperature can be solved. Furthermore, the problem of abnormal vibration under leaning load can be solved by readjusting shrink disc, torque arm and universal joint coupling. After solving above problems, the rotary kiln equipment runs stably and meets the requirements of system to increase production and speed.

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A Simple Calculation Method on Material Proportion

FENG Shengsui

Cement Technology 2001, 1 (4): 75-76.

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Environmental Impact Assessment of Cement Life Cycle with Gangue and Fly Ash as Mixed Material

LI Zhengze, LI Gang, GUO Xiaolu, LIU Zhuolin, SHE Anming

Cement Technology 2023, 1 (6): 86-89. DOI: 10.19698/j.cnki.1001-6171.20236086

Abstract

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The Life Cycle Assessment (LCA) method was used to compare and study the environmental impact of the whole production process of P·O 42.5R cement and P·Ⅱ 42.5R cement produced before and after the use of mixed material in a cement plant in Guangzhou, and the evaluation results were analyzed. Six environmental impact types were selected: Global Warming Potential(GWP), Acidification Potential(AP), Abiotic Depletion Potential(ADP), Eutrophication Potential(EP), Respirable Inorganic material(RI), and Photochemical Ozone Formation Potential(POFP). LCA calculation shows that adding 3.34% gangue and 3.32% fly ash in the cement grinding process can reduce the six environmental impacts of the cement production process. GWP, ADP, AP, EP, RI and POFP decreased by 8.52%, 9.18%, 9.09%, 8.68%, 8.88% and 8.29% respectively.

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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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WU Yingde

Cement Technology 2001, 1 (5): 76-76.

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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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