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2024 Vol. 0, No. 08
Published: 2024-08-10
1
Study on comprehensive optimization of cement life cycle considering performance index
CHEN Shuyi, et al
The cement industry accounts for approximately 14.3% of the national carbon emissions, which has a significant impact on achieving the ‘double carbon’ target. Most of the existing studies on cement life cycle assessment only consider the environmental impact. In this paper, a comprehensive approach to evaluate the life cycle of cement is proposed, which takes into account the performance of the finished product and its environmental impact. First, the environmental impact assessment method of cement life cycle is designed and proposed, the boundary model and bill of materials for cement production are established, and the CML2001 method is used to calculate the environmental impact of cement life cycle. The results show that the main environmental impact is the global warming potential, and the impact of the clinker calcination stage on the environment is the greatest among all stages. Based on the results of the life cycle environmental assessment, a multi-objective optimization model of the performance and environmental impact of a unit cement product is constructed in the clinker calcination stage, which takes into account the deviation of the carbon dioxide decomposition and the three rate values, and uses the NSGA-II algorithm for simulation analysis. This model is intended to provide theoretical guidance for cement production and reduce the environmental load in the production process while maintaining good cement performance.
2024 Vol. 0 (08): 1- [
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9
Research on low-carbon fuel projects in cement industry abroad
Hot!
WANG Shasha, et al.
2024 Vol. 0 (08): 9- [
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53
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12
Industrial test of biomass fuel in 4 800 t/d production line
SHEN Hongcheng, et al.
2024 Vol. 0 (08): 12- [
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39
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15
Insight into competitive pattern of cement industry from perspective of development
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XU Jijun
2024 Vol. 0 (08): 15- [
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17
Study on cementing system of phosphogypsum-low alkalinity sulfoaluminate cement and its hydration mechanism
YANG Li, et al.
The setting time, mortar strength and pH of the mixed cementitious material system with 10%~50% modified phosphogypsum (WHPG) added to L-SAC were studied, and the effect mechanism of WHPG on the strength, pH and setting time was analyzed. The results show that the water consumption of standard consistency will increase and the setting time of the gelling system will be shortened due to the defects and rapid hydration properties of WHPG. The addition of a small amount of WHPG can reduce the actual water-cement ratio of L-SAC, promote the formation of ettringite, improve the compactness of the body and increase the strength. WHPG is weakly acidic, so pH decreases with the increase of WHPG content. WHPG continuously consumes alkaline substances generated by L-SAC hydration, resulting in lower pH in later stage. The properties of phosphogypsum-low alkalinity sulfoaluminate cement cementing system are very suitable for jet planting concrete
2024 Vol. 0 (08): 17- [
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23
Study on quantitative characterization of specific surface area of clinker and mixture in cement
ZHANG Bin, et al.
Clarifying the specific surface area of clinker and admixture in cement is the basis for preparing cement and reducing the clinker coefficient. Taking advantage of the density differences between clinker and admixture, the quantitative characterization method of the specific surface area of clinker and admixture was studied by dividing the cement particle size range and using experimental and computational methods in this paper. The results show that as the cement particle size increased, the clinker content gradually increased and the mixtures content gradually decreased. The specific surface area of P·C 42.5 cement with the range of 0~20 μm was 612.9 m2/kg, and the clinker content in cement with the range of 0~20 μm was 64%. When the particle size was greater than 45 μm, the specific surface area of cement was 61.8 m2/kg, and the clinker content was 93%. Taking P·C 42.5 cement with a specific surface area of 380 m2/kg as an example for calculation, the specific surface area of the clinker was about 334 m2/kg, and the surface area of the mixture was about 639 m2/kg by calculation
2024 Vol. 0 (08): 23- [
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27
Study on combined activation of ultrafine grinding and chemical excitation of air-cooled blast furnace slag
XìNG Zejia, et al
The air-cooled blast furnace slag has low hydration activity. In the industrial trial of a cement production enterprise, air-cooled blast furnace slag was used as the mixing material to produce blended cement. It was found that the content of slag powder in cement is usually below 30%. This article proposed a technical approach of combined activation through ultrafine grinding and chemical stimulation. The grinding process was transformed to achieve ultrafine grinding of air-cooled blast furnace slag, and the effects of grinding process parameters on the particle size and activity index of slag powder were investigated. When the specific surface area of the slag powder was 650 m2/kg, the 28d activity index reached 88.4%, which was 26.2% higher than the raw slag powder. Regarding chemical stimulation, the study examined the types and dosages of activators, as well as the effects of multicomponent compounding on the activity of slag powder. Ultimately, the composite activator was prepared with sodium sulfate, potassium aluminum sulfate and triethanolamine as the main components. The introduction of 1.5% composite activator during the mineral powder grinding process can increase the 7d activity index by 16.9%.
2024 Vol. 0 (08): 27- [
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34
Study on mechanism of mechanical activation of blast furnace slag
SHEN Hongdong, et al.
In this paper, the effect of mechanical activation on the activity of blast furnace slag was systematically studied. X-ray diffraction (XRD), particle size analysis, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize the crystal structure, particle size change, chemical functional groups and microstructure of the samples after different grinding times (20 min, 30 min and 40 min), respectively. The results showed that the mechanical activation can significantly improve the potential activity of blast furnace slag, and the optimal grinding time was 20 min. After mechanical activation, the slag particles were deformed and the specific surface area was increased. Under the action of mechanical force, the structure of blast furnace slag was damaged, and the Si-O bonds were rearranged, and a large number of surface reaction sites were formed. The activity index increased by 9.01% at 28 days.
2024 Vol. 0 (08): 34- [
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38
Experimental study on thermal decomposition of raw materials with different particle sizes under high carbon dioxide concentration atmosphere
KANG Yu, et al.
Based on the thermal decomposition test of raw meal in large thermogravimetric experimental platform and suspension furnace under the atmosphere of high carbon dioxide concentration, we studied the thermal decomposition characteristics of raw meal in different particle size range(<45 μm, 45~75 μm, 75~250 μm). The results show that under the same experimental conditions, as the particle size becomes finer, the thermal decomposition temperature of raw meal is lower, the decomposition time of raw meal is shorter. However, there is a little difference in the thermal decomposition performance of raw materials among the three particle size ranges, which illustrates that particle size has limited influence on the thermal decomposition performance of raw meal in the range of micron
2024 Vol. 0 (08): 38- [
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43
Research on different SCR denitration technology of cement kiln flue gas
HU Lin, et al.
2024 Vol. 0 (08): 43- [
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47
Comparison of SCR operation at high temperature and high dust and medium dust at high temperature
Hot!
GAO Shangsheng, et al
2024 Vol. 0 (08): 47- [
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82
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49
Design, operation and optimization of water-cooled dechlorination system
AI Hao, et al
2024 Vol. 0 (08): 49- [
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43
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52
Practice of low cost operation of wet desulfurization system in cement plant
LI Yutian, et al
2024 Vol. 0 (08): 52- [
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38
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55
Analysis of influencing factors of radioactivity multiple of low-radiation background cement
DONG Zhirong, et al
2024 Vol. 0 (08): 55- [
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38
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59
Influence of angle of third air ducts into calciner
WANG Qiang, et al
This study utilizes computational fluid dynamics (CFD) simulation methods to investigate the impact of different entry angles of tertiary air ducts on the performance of calciner. By comparing the situations of tertiary air ducts entering the calciner at different angles, the different effects on the decomposition rate of raw materials, gas temperature distribution, and raw material temperature distribution in the calciner are analyzed. The results show that different entry angles significantly affect the fluid dynamics and heat transfer characteristics within the calciner. The optimal entry angle demonstrates the best performance, effectively improving the decomposition efficiency of raw materials and improving the temperature distribution of gas and solid phases. This finding provides important theoretical guidance and technical support for the design and operation of calciner, facilitating further optimization of cement production processes to increase production efficiency and product quality.
2024 Vol. 0 (08): 59- [
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62
Discussion on role of air leakage control in energy saving and consumption reduction
WEI Gailing, et al
2024 Vol. 0 (08): 62- [
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44
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63
Application of cylinder ovality detection in damage analysis of refractory brick in cement kiln
XI Hanbo, et al
2024 Vol. 0 (08): 63- [
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35
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66
Development and application of digital empowered cement factory intelligence laboratory
Hot!
LI Donghong, et al
With the presentation of new productivity in building materials industry, it is particularly important to digitally empower the research and exploration of basic building materials production processes. Taking the upgrading and renovation of Luoyang Huanghe Tongli Cement Co. LTD., as an example, this paper introduces the digital mining, intelligent laboratory testing system and complete sets of equipment, which involves automatic sampling of mine mining and drilling rig, intelligent testing and analysis of the whole process, intelligent storage and sampling system of outgoing cement and automatic coal detection, etc. By comparing the application effects with traditional production models, it aims to create a standard example of the digital mine and intelligent laboratory control system in the cement sector of China National Building Materials Group, promote the intelligent manufacturing process of the Group, and support the strategic goals of dual carbon, green manufacturing and sustainable developmen
2024 Vol. 0 (08): 66- [
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70
Practice of reformation of automatic control system for waste heat power generation in cement plant
WANG Zhen, et al
2024 Vol. 0 (08): 70- [
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36
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72
Optimization of determination method of calorific value of furfural slag
ZHANG Zhihui, et al
2024 Vol. 0 (08): 72- [
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34
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75
Research on bridge crack detection algorithm based on machine vision recognition
CHENG Qifeng, et al
2024 Vol. 0 (08): 75- [
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71
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80
Effect of C3A content on hydration and mechanical properties of silicate-sulphoaluminate composite system
LI Shuai, et al
Aiming at the problems of difficult control of setting time, uncoordinated development of strength and unstable volume in the later period when sulphoaluminate cement (CSA) and Portland cement (PC) are compounded. In order to explore the effect of aluminum phase composition in silicate on the hydration of PC-CSA composite system, the effects of C3A content and sulfur-aluminum ratio on the volume stability and mechanical properties of PC-CSA composite system and its mechanism were studied by adding different proportions of C3A single ore. The results show that with the increase of C3A content, the setting time of PC-CSA increases, the mechanical strength decreases and the free expansion rate increases. When the content of C3A increased by 8 %, the initial setting time and final setting time of PC-CSA system were prolonged by 36 min and 66 min respectively, the compressive strength of 28 d decreased by 8.45 MPa, and the free expansion rate of 28 d increased by 0.17 %. There is a competitive hydration relationship between C3A and C4A3S. The content of C3A will inhibit the hydration of C4A3S, increase the content of AFm, and delay the early hydration of C3S. When the hydration product AFt / C-S-H of the system is 0.15, the ratio of the two is moderate, and AFt is short and thick, with high strength and good volume stability.
2024 Vol. 0 (08): 80- [
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87
Exploration of testing methods for shrinkage performance of polymer modified mortar
WANG Pei, et al.
By studying the effect of water consumption and adhesive powder content on the shrinkage value of polymer cement mortar specimens of different specifications, and analyzing the influence of specification size on the shrinkage value of polymer cement mortar, the results show that the shrinkage value of polymer cement mortar increases rapidly in the initial stage and slowly in the later stage. The sensitivity of shrinkage specimens of different specifications to changes in water consumption and rubber powder content varies; Except for the special 10 mm×50 mm×1 000 mm specimen, the 40 mm×40 mm×160 mm specimen has the highest shrinkage value
2024 Vol. 0 (08): 87- [
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93
Application of lightweight active materials in soft soil foundation treatment of highway engineering
SUN Fang
2024 Vol. 0 (08): 93- [
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71
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96
Optimization and application of seismic design for tall buildings
WU Huawei
2024 Vol. 0 (08): 96- [
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56
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100
Experimental study on treatment method of waste concrete in concrete batching plant
XU Huihui, et al.
The current treatment of waste concrete about concrete batching plant still exists some questions such as low utilization, environmental pollution, and poor economic efficiency. This study used a composite additive to regulate the plastic effect of the waste concrete to make it appear in the same state as fresh concrete. Then it can be used with newly concrete or be used as concrete in different strength grades. This method can not only realize the full utilization of residual waste materials, but also save resources, save energy and reduce emissions, and protect the environment
2024 Vol. 0 (08): 100- [
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