在天然砂资源有限和环保大环境下,机制砂高性能混凝土已经普遍应用.笔者就机制砂中石粉含量对硫铝酸盐水泥基高性能混凝土耐久性能影响进行研究,主要研究不同石粉含量对硫铝酸盐水泥基混凝土耐久性能(抗冻性和抗渗性等性能)的影响.研究表明:随着机制砂中石粉含量的增加,其硫铝酸盐水泥基高性能混凝土抗冻性能逐渐增强,且掺量越高增强越明显;其硫铝酸盐水泥基高性能混凝土抗渗性能逐渐提高,且掺量越高提高越明显.
1 水泥磨选粉机的控制现状 水泥磨选粉机的作用是对水泥磨研磨后的熟料颗粒进行打散、分级、筛分,将符合成品要求的水泥颗粒输送出来,没有达到成品要求的水泥颗粒被重新返送回磨机进行再次粉磨.水泥磨选粉机在水泥生产过程中有着及其重要的作用,是整个水泥生产链的最后环节,是把控水泥质量的最后一道保障,直接关系到水泥成品的质量.
In order to improve the design quality,after comparing various 3D design software,in response to the design difficulties of ce-ment kiln waste heat recovery engineering,3D design software such as PLANT 3D and Solidworks are mainly used for the design of ce-ment production line waste heat recovery engineering.Based on specific engineering applications,specific implementation methods are introduced for the three process sub items of waste heat boilers,waste heat power plants,and plant steam and hot water pipelines,great-ly improving design accuracy and efficiency.
Developing a"five stage+"series-parallel coupling reconstruction heat transfer technology using the principle of high solid-gas ratio and achieving engineering application,reducing the outlet temperature of the preheater by 20～50 ℃,has a significant effect on improving the heat transfer efficiency of the preheater.The relatively low cost of system transformation makes it impossible to upgrade the original design tower to a six stage five stage dual series suspension preheater due to factors such as insufficient load margin,which further improves the efficiency of raw material heat exchange and reduces the temperature of exhaust gas,thus achieving the goal of en-ergy conservation and carbon reduction.
0 前言 新疆南疆区域,受区域资源限制,AKS公司生产水泥所需活性混合材资源日益短缺,为了降低生产成本,应对无可用优质混合材的困难局面,该公司积极寻求可替代原料,结果不尽人意,考虑应用窑尾收尘灰,一方面窑尾收尘灰一部分经过高温煅烧,含有部分具有活性作用的的硅、铝矿物;同时收尘灰经过收尘收集,具有较高的比表面积(该公司分析结果550 m2/kg以上),若作为混合材,能够优化水泥颗粒级配,改善水泥颗粒堆积密实性.为此该公司进行了窑尾收尘灰做混合材的实验研究.
11月15日,国家统计局发布了10月相关经济数据.总的来看,10月,国民经济持续恢复向好,主要指标持续改善,经济运行总体平稳. 其中,10月水泥产量19 121万t,同比下降4.0％;1～10月水泥产量168585万t,同比下降1.1％.而2022年1～10月水泥产量175 889万t,全口径减少7 304万t,跌幅4.15％.
This research project is based on the intelligent production line construction project of Sinoma Jiangxi Electric Porcelain Electric Co.,Ltd.It mainly studies methods to improve the early strength of cement adhesives from the aspects of cement variety,retard-er type,mineral admixture dosage,etc.The experiment shows that by adding retarders and slag,the comprehensive performance of sul-foaluminate cement is better than that of early-strength Portland cement;At the same time,through the improvement of production pro-cess,the measurement of each component of the adhesive is accurate.By using the temperature of the company's kiln exhaust gas to in-crease the temperature of the curing room,the early strength of the adhesive is improved,and the demolding speed is accelerated,which can meet the requirements of intelligent production line batch production.
In the process of overseas EPC project construction,some countries where the project is located have the problem of incom-plete power grid infrastructure.Our company provides a variety of power solutions to promote the research of multi-energy complemen-tary utilization of new energy.This paper analyzes the overhead line engineering practice of power transmission and transformation in the self-provided power plant project.The transmission line of this project provides power to end users.According to different genera-tion costs and line losses,the power supply cost is about 0.6 yuan/kWh,which has good social and economic benefits and provides ref-erence for the later multi-energy complementary engineering practice.
In order to obtain the collapse performance of base isolated structure after fire,the mechanical properties of lead rubber bear-ing at high temperature were studied.The finite element model of the lead rubber isolation bearing and the base isolation frame are es-tablished by ABAQUS finite element software,and the thermal mechanical coupling analysis is carried out.The vertical stiffness chang-es of rubber bearings under high temperature are analyzed,and the collapse mechanism,stress state,deformation law and plastic hinge distribution law of base isolated frame structures are analyzed.The results show that the vertical stiffness of the lead rubber bearing de-creases gradually with the increase of the fire time,and the bearing capacity is completely lost when the fire 75 min;The frame presents different stress and deformation states when the different bearing of the base isolation frame is subjected to fire;The frame collapses continuously when the side support and the internal double support are subjected to fire.
The impacts of flue gas recirculation on combustion characteristics such as temperature,composition,NOx distribution,and wall heat transfer in lime rotary kiln were studied by numerical simulation method.The results show that the addition of recirculated flue gas alleviated the degree of flame tilt,decreased the centerline peak temperature in the kiln by 102.5 K,and the peak average temperature by 39.9 K.The faster speed of the oxidizer strengthened the entrainment ability of the secondary flow and accelerated the decomposition of CH4 into CO.Under the influence of temperature,O2 and CO,the amount of NOx generated was reduced to 615 mg/m3,and the denitration efficiency reached 71.5％.
由苏州中材承建的池州新材料项目秋浦河隧道工程"华东一号"盾构机顺利始发. 秋浦河隧道区间线路长1206 m.此次始发的"华东一号"盾构机,主机身直径6.28 m,长9.2 m,承担整个秋浦河盾构段852 m隧道掘进任务,掘进区间主要穿越地层为淤泥质粉质黏土、含砾中粗砂、粉质黏土、卵石土、全风化砂砾岩、强风化砂砾岩和中风化砂砾岩,具有地质条件复杂、控制因素多等特点.针对盾构施工制定周密前期策划方案,反复推演施工流程,开展岗前安全、技术交底,顺利完成盾构机吊装下井、安装调试、始发条件验收等关键环节,为盾构掘进奠定了坚实基础.
The feasibility of using low-silicon content tungsten tailings instead of quartz sand to produce autoclaved lightweight con-crete(ALC)is discussed.The optimal mix ratio for producing ALC from tungsten tailings was obtained.The average density of the pro-duced ALC is 643 kg/m3,and average compressive strength is 4.5 MPa,which meets the requirements of A3.5 and B06 grade ALC qual-ified products in the GB/T 11968-2020 standard.At the same time,the micro-structural analysis of tungsten tailings-ALC shows that as the aluminum content increases,a new crystal of Al-substituted tobermorite will form,which reinforce strength.
In order to promote the digital transformation of cement factory,one 4 500 t/d cement production line in Shanxi Province ad-opted an intelligent optimization control system instead of traditional manual control.The optimization control system includes five sub-systems:clinker burning,raw material grinding,cement grinding,slag grinding,and coal grinding,which has good adaptability to dif-ferent working conditions.Operating rate of the optimization control system exceeds 95％.Compared with manual control,heat con-sumption of clinker burning is reduced by 0.79 kg/t,0.82％coal is saved under intelligent control conditions,and the operating power consumption is decreased by 1.77％～4.24％,output is also increased by 1.21％～3.96％.
This article starts from studying the current operating conditions of MLS3626 internal circulation raw material vertical mill,analyzes the reasons for high system energy consumption,and proposes two routes for external circulation production increase and con-sumption reduction technical transformation,namely the semi external circulation and pure external circulation system transformation routes,aiming to obtain better energy consumption indicators and economic benefits of the raw material mill system;In addition,a"small,fast,and flexible"technological transformation mode has been proposed for users with low demand for consumption reduction.
0 前言 水泥窑预分解系统翻板阀在预热器系统中的作用是保持下料管经常处于密封状态,既保持下料均匀畅通,又能密封物料不能填充的下料管空间,最大限度的防止由于上级旋风筒与下级旋风筒出口换热管道间由于压差容易产生的气流短路、漏风,做到换热管道中的气流及下料管中的物料气走气路,料走料路,各行其路.
This article mainly introduces the process flow of a new type of homogenization technology for alternative fuels used in ce-ment kilns.With unique innovative transformation,it effectively improves the problems of unclear pre-treatment of different materials,complex materials,low heat generation and substitution rate,unstable kiln conditions,and low production and disposal efficiency in the current use of alternative fuels.This is beneficial for promoting the cement industry to achieve carbon peak and carbon neutrality,save coal,reduce production costs,and reduce carbon emissions,Through green,low-carbon,and environmentally friendly transformation,strive for more benefits and survival space for the enterprise itself.
The stereographic projection method and the numerical analysis method are the common methods to study the slope stability at present,which have their own advantages and disadvantages.In this paper,the east slope of Changyaoshan Cement Limestone Mine in Yingde City is taken as an example,and the slope stability analysis is carried out by different methods.The results show that the slope stability is qualitatively analyzed by the stereographic projection method,and the results show that the slope stability is poor.Geostudio and midas GTS NX numerical simulation method are used to quantitatively analyze the slope stability based on Morgenstern-Price method,Bishop method and SRM theory.The results show that the slope stability is good.Based on the current situation of mine slope mining and actual geological conditions,the slope monitoring scheme is designed to provide a reference for better verification of the analysis results in the later stage.
近日,由中国上市公司协会顾问委员会主办,中关村国睿金融与产业发展研究会、浙报集团银柿财经联合承办的"中国上市公司协会学术顾问委员会学术研讨暨中国上市公司健康指数2023发布会"在北京圆满落幕. 会上,"2022年度中国上市公司健康指数百强"正式"揭榜",中材国际再次强势上榜.中国上市公司健康诊断体系包括公司治理、外部监督、创利能力、竞争态势、产品销售、价值再造、资产资本结构、内部控制以及企业文化等九大系统,共涵盖39个子维度和400余个底层指标,以全面、客观、公正的方式对上市公司的健康程度进行评估.
Coal gangue can be used as supplementary cementitious material to replace part of cement clinker after applicable thermal treatment.This strategy not only offers a utilization of coal gangue as one resource,but also provides a new path for carbon emission re-duction in cement industry.It is important to notice that the calcination process of coal gangue should be controlled carefully because of its complicated composition.The heat transfer,mass transfer and chemical reaction of coal gangue in calciner were numerical simulated by using CPFD method.The gas-solid two-phase flow field in the calciner under different working conditions was analyzed.The results show that the combustible components of coal gangue cannot burn when the temperature of inlet air is low,and this problem can be ef-fectively solved by offering high temperature flue gas in the early and feeding meal by step.
