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Upgrading and Renovation of TRMK5041 Cement Vertical Mill Grinding System
Collect
AN Weijun, YIN Jianjun, HUA Song, LIU Di, PENG Lingyun
Cement Technology, 2024, 1(2): 13-18.
doi:10.19698/j.cnki.1001-6171.20242013
Before modification, domestic cement vertical roller mill TRMK5041 grinding system had issues of bad stability, low operation pressure, uneven distribution for resistance and low grinding efficiency. By improving the structure of the grinding area, widening the effective grinding area, increasing the hydraulic system cylinder size, adding grinding roller projection pressure, using low-resistance louver ring and optimizing the structure, locally modifying the circulating gas duct, reducing gas duct elbows, and applying classified grinding technology, the stability and grinding efficiency of the mill were effectively improved, achieving the goal of increased productivity and reduced consumption. After the modification, under the same conditions of cement composition and product fineness, the TRMK5041 cement vertical mill increased output by more than 10%, and the system's power consumption decreased by 4.0 kW?h/t, demonstrating significant improvement. The project had a short modification period, with a construction period of only 25 days and a high return on investment.
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Discussion on Assembly Process Line of Grate Cooler Roller Device
Collect
YANG Jie, LIU Guanghui, YANG Jun, LIANG Peng, ZHOU Jian
Cement Technology, 2024, 1(2): 19-23.
doi:10.19698/j.cnki.1001-6171.20242019
This article introduces the structural characteristics, working principles and relevant technical requirements for manufacturing and assembly for roller support devices of the grate cooler. It analyzes problems existing in traditional assembly processes and also proposes improvement schemes. It elaborates the assembly process for the roller support device assembly line and explains the design principle and production process of hydraulic auxiliary fixtures. The result of this research realizes the standardized assembly line for roller support devices of the grate cooler with streaming working style, which greatly improves assembly quality and efficiency, significantly enhances product competitiveness, and has high promotion value.
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The Influence of Preheater Dispersion Plate Structure on Gas-solid Heat Transfer
Collect
XU Xuehui
Cement Technology, 2024, 1(2): 24-27.
doi:10.19698/j.cnki.1001-6171.20242024
This study analyzed the important function both of gas-solid heat transfer mechanism and the dispersion plate during cement pyro process. Three types of flat dispersion plate structural features are discussed including conventional fixed type, rotatable type installed by a rotating shaft, and adjustable angle fixed by a top pin shaft, as well as the related problems of poor material adaptability, potential blockage, and uneven material distribution and etc. Improvement is achieved in terms of increased tortuosity of spreader, height and distribution area for materials by redesigning it into sector spreader and introduced into an umbrella rib framed guide plate. These modifications reduce material agglomeration while enhancing uniformly material distribution and heat transfer efficiency. Practical implementation demonstrates that this new spread plate structure enhances cement clinker production efficiency while reducing the system energy consumption. Therefore, it will be widely applied in future.
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Development and Application of One-button Heating System in Cement Rotary Kiln
Collect
ZHAO Hua, ZHANG Chuang, MA Chunhui, LI Zhidan, ZANG Jianbo
Cement Technology, 2024, 1(2): 28-33.
doi:1001-6171（2024）02-0028-06
A 7 500t/d cement clinker production line adopts the one-button heating scheme of rotary kiln system, applies the new intelligent control platform software and built-in standard heating curve program, and realizes the one-button heating of cement rotary kiln by manually setting parameters, transforming the field device and actuator, controlling the switch quantity of the central control device and the simulated quantity of the actuator according to the temperature node of the smoke chamber. It achieves the heating requirements of "slow heating, no turning back, and uniform drying of the kiln", greatly reduces the labor intensity, effectively reduces the damage of refractory materials caused by improper heating rate, and realizes the standardization of start and stop equipment and parameter adjustment during the heating process.
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Stability Analysis of an High-steep Slope in Limestone Open-pit Quarry
Collect
ZHAO Xiang, ZHU Gang, WEN Kai, WANG Rong, LIAO Zhengbiao
Cement Technology, 2024, 1(2): 34-40.
doi:10.19698/j.cnki.1001-6171.20242034
The high-steep slope of a limestone production quarry was used as the research object of stability analysis in southwestern China. Firstly, the engineering geological areas of present slope and end slope is divided, based on the slope engineering geological survey, the structure of slope, and the characteristics of the structural plane. Then, the limit equilibrium method of Morgenstern-Price is used to calculate and analyze the stability of the present and end slope, through out the indoor rock mechanics test to obtained the slope rock quality and the GSI index. The research results show that the present slope and end slope are all stable, and the design parameters of slope is reasonable. At the same time, it also can provides a scientific basis for the safety design and produce in quarry.
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Interpretation of Glif Algorithm Report and Pipe Layout Techniques in AutoPSA Pipeline Stress Analysis Software
Collect
ZHANG Xin
Cement Technology, 2024, 1(2): 41-49.
doi:10.19698/j.cnki.1001-6171.20242041
The key to the design of steam & water pipe in cement kiln waste heat power generation system lies in reasonable pipe layout and stress analysis. This paper analyzes the key points in six typical calculation conditions of Glif algorithm in AutoPSA software which used in steam & water pipe design, explains the code meaning and adjustment techneques of the five parts: pipe design parameters, nozzle force, cold/hot displacement calculation & spring selection, support and hanger load calculation, maximum stress calculation. Combined with the engineering examples, the criterion of acceptability for the steam & water pipe design is put forward: the stress should not exceed 70%~80% of the allowable stress; support and hanger cannot be empty, pipe displacement should not exceed 150mm; no spring in series and no constant force spring; the nozzle force does not exceed the allowable value of the equipment.
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Cable Selection Design and Cable Laying Scheme Analysis for Cement Plant
Collect
LI Yinghui, LOU Lijiang, ZHANG Junfeng, ZHANG Yu
Cement Technology, 2024, 1(2): 49-.
doi:10.19698/j.cnki.1001-6171.20242049
Power cable laying mode is gradually shifting from manual mode to mechanical mode. It can reduce the costs and risks, improve the efficiency through the mechanical cable laying. This paper introduced the power cable type, laying mode and some important parameters. The cable routing is through cable trenches, cable tunnels, cable trays, cable corridors or cable conduits in cement plant. The differences between manual cable laying mode and mechanical cable laying mode in working hours and benefits was analyzed. Compared to mechanical cable laying mode, manual cable laying mode requires more manpower and meets higher construction risks and lower efficiency.
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Application of Seismic Parameters Transform between Indian and American Standard in Cement Project
Collect
LIU Xiumei
Cement Technology, 2024, 1(2): 56-61.
doi:10.19698/j.cnki.1001-6171.20242056
The method of transformation seismic parameters between Indian standard and American standard was introduced. Taking the structure design of the pump house in waste heat recovery power project for cement factory as an example, through the contrastive analysis of the important seismic parameters such as importance factor, site class, response modification coefficient, maximum earthquake spectral response acceleration parameters, etc. between the Indian standard IS 1893(Part 4):2005 and American standard ASCE/SEI 7-10. The correctness of the parameter transformation was verified by the seismic response spectrum curves fitting and the calculation results of the horizontal earthquake. The results of transformation seismic parameters showed that the seismic response spectrum curves of the Indian and American standard were fitted, and the calculated horizontal seismic forces were close.
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Energy Saving and Consumption Reducing Practice of Cement Grinding System
Collect
ZHANG Liang, WEI Hongqi
Cement Technology, 2024, 1(2): 62-66.
doi:10.19698/j.cnki.1001-6171.20242062
By
optimizing the roller press system and ball mill system, adjusting the position
of grinding aids, optimizing the dust into the process of selecting powder
machine, the output of cement grinding system is increased. Through the use of
air suspension fan, inverter fan transformation, elimination of high energy
consumption air compressor and other measures to upgrade the auxiliary equipment
to improve the efficiency of the fan and air compressor, the technological
process of grinding system was optimized by removing belt machine, skirt board
machine, spiral conveyor of dust collector, air chute of grinding tail dust
collector, reforming ash hopper and cyclone tube. It achieved the fine
management of grinding system due to reducing the idle and low-load operation
time of the equipment, reducing the compressed air leakage of the grinding
system, optimizing the spray frequency and piping arrangement of the dust
collectors, and using electricity to avoid peak-to-valley production and
operation. After transformation, the power consumption of cement preparation
section is reduced from 34.9 kW·h/t to 30.8 kW·h/t, which can meet the
requirement of national standard.
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The Co-processing Disposal Production Practice of Waste FCC Catalyst with Cement Kiln Conditions
Collect
KONG Ruirui, GE Nannan, ZHANG Lei, GAO Xiang, QI Huailian
Cement Technology, 2024, 1(2): 71-77.
doi:10.19698/j.cnki.1001-6171.20242071
In this study, the effects of coordinated disposal of waste FCC catalyst in cement kilns on kiln operation conditions and clinker quality were studied, which carried out the characteristics analysis of waste FCC catalyst, heavy metal leaching rate and compatibility scheme analysis test. The deficiencies of collaborative disposal of waste FCC catalyst in production practice were introduced, meanwhile including the effects of waste FCC catalyst on kiln tail gas emission, water quality and clinker quality. The results show that compatibility calculation and quality control should be strengthened in advance when using cement kiln to dispose waste FCC catalyst. The waste FCC catalyst should be fully integrated with the cement raw material ratio during the disposal process. For waste FCC catalysts with alumina content of about 35% and silicon oxide content of about 33%, the disposal amount should be controlled within 1.6t/h.
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Application of Solar Photovoltaic Power Station in Energy Saving and Emission Reduction of Cement Plant
Collect
ZOU Zheng
Cement Technology, 2024, 1(2): 78-81.
doi:10.19698/j.cnki.1001-6171.20242078
Solar
photovoltaic power generation system is mainly composed of photovoltaic module,
inverter module, power distribution module and monitoring module, etc. This
paper analyses the key technical difficulties such as building structure
adaptability, shadow effect, space limitation, environment adaptability, power
consumption and grid access, power station monitoring and maintenance. And then
it gives the solution measures in the application of solar photovoltaic power
plant in cement factory, and puts forward the photovoltaic module in the cement
factory. The arrangement and selection of PV modules in the cement plant, the
electrical design of PV power station, and the construction organization plan
are proposed. Through the analysis of investment returns, it can be seen that
the PV power station in cement enterprises can achieve the goal of multi-year
stable income with one investment.
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Application of Aerogel Thermal Insulation Materials in the Cement Industry
Collect
PIAO Jiasi, ZHAO Zhiguo, ZHANG Lei, XU Hongzhao, ZHOU Changling
Cement Technology, 2024, 1(2): 82-86.
doi:10.19698/j.cnki.1001-6171.20242082
The preparation process and thermal insulation mechanism of aerogel thermal insulation materials are introduced in detail, compared the performance advantages of aerogel insulation materials and traditional insulation materials. Combined with the application cases of aerogel thermal insulation materials in the cement industry, the application of aerogel thermal insulation materials in the cement rotary kiln, calciner, cooler system and auxiliary equipment of firing system are analyzed. Aerogel thermal insulation materials will gradually replace the traditional thermal insulation materials, establish a new thermal protection system, reduce energy consumption, and further promote the green transformation of energy saving and carbon reduction in the cement industry.
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Research of Sandstone as Admixture in Composite Portland Cement
Collect
ZHU Bingbing, LIANG Jin, HUANG Kai, YANG Yizhao
Cement Technology, 2024, 1(2): 87-90.
doi:10.19698/j.cnki.1001-6171.20242087
The chemical composition, methylene blue value, and mineral composition of sandstone in the Jingmen area Hubei province were analyzed. The sandstone is used as admixture to produce composite Portland cement. The effect of different type and ratio sandstone on cement consistency, setting time and strength were studied. The feasibility of sandstone as admixture in composite Portland cement is verified. The results show that the type and ratio of sandstone should be strictly selected and controlled in composite Portland cement, and the appropriate dosage of sandstone is 3%~4%,otherwise cement will be difficult to meet the requirements of engineering construction.
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The Influence of Glass Powder with Different Replacement Rate on the Performance of Concrete
Collect
LI Te, LI Qi
Cement Technology, 2024, 1(2): 91-96.
doi:10.19698/j.cnki.1001-6171.20242091
Waste glass as construction waste has great harm to the environment. Adding glass powder to concrete can make effective use of resources and eliminate the pollution of waste glass to the environment. The research shows that adding glass powder to concrete leads to increased particle friction, the higher the substitution rate, the worse the working performance of concrete, and the ash effect in the early stage of glass powder is not obvious, the addition of glass powder will reduce the early compressive strength of concrete, but with the increase of age, the compressive strength of concrete will increase. The whole life cycle analysis shows that good environmental and economic benefits can be obtained by adding proper amount of glass powder.
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