金隆蒸汽回转干燥机国产化改造实践

金隆公司充分利用公司冷修期间对蒸汽回转干燥机进行了国产化改造,在对改造前蒸汽回转干燥机存在问题进行分析基础上,重点介绍了对干燥机的改造过程。改造后,蒸汽回转干燥机运行状况稳定,达到改造目的。     

CTA干燥机工艺参数的核算及提产降耗改造

根据粗对苯二甲酸干燥机现场采集的数据,对蒸汽管回转干燥机的重要参数如传热系数,停留时间以及填充率等进行了核算。根据计算以及现场实际操作,通过提高加热蒸汽压力至0.6 MPa的方法,使干燥机达到了期望产能。同时,采用凝液罐代替原有疏水阀的改造可有效地降低蒸汽损失,达到节能降耗的目的。     

蒸汽管回转干燥机制造过程中的质量控制

蒸汽管回转干燥机是一个对制造精度要求很高的大型动设备。介绍了蒸汽管回转干燥机的结构、工作原理以及特点和用途,分析了在制造过程中的主要检验控制点,如筒体的同轴度及关键部位的跳动量等,以保证蒸汽管回转干燥机的制造质量。     

一种以焦炉尾气作为载气的热传导型煤调湿装置

正本实用新型涉及焦炉炼焦煤调湿、干燥技术领域,是一种以焦炉尾气作为载气的热传导型煤调湿装置。是将煤粉缓冲仓通过计量皮带输送机与蒸汽管回转干燥机前端进料螺旋相连,蒸汽管回转干燥机末端设有出料螺旋输送机;焦炉尾气风机由管路与蒸汽管回转干燥机前端进料螺旋相连,蒸汽管回转干燥机末端设有     

蒸汽列管回转脱硫石膏干燥机的数值模拟

根据初步的实验和蒸汽列管回转干燥机传热机理的分析研究,对干燥机内固体颗粒运动轨迹、固体浓度场、速度场、温度场等采用多相流与粒子传热模型来描述,并以CFD软件为平台,将实际工程情况进行简化后对间接换热蒸汽列管回转石膏干燥机进行了数值模拟。与实验结果对比表明,该模型具有较高的模拟精度,可为间接换热蒸汽列管回转石膏干燥煅烧机的工程设计及结构优化提供参考。     

PIA预干燥技术的开发和应用

以中国石油化工股份有限公司北京燕山分公司30kt／a PIA工业装置改造为依托,通过技术调研、试验研究、方案论证,成功开发了一种盘式桨叶预干燥机＋蒸汽管回转干燥机的组合干燥技术及专用型PIA盘式桨叶干燥机技术。     

PTA蒸汽管回转干燥机的改造设计

基于国内某化纤厂PTA干燥机更新改造项目,介绍了PTA干燥机的改造设计过程,从质量衡算、热量衡算及换热面积计算、长径比及布管设计、停留时间和填充率、斜度和转速等方面,重点介绍了PTA蒸汽管回转干燥机的工艺设计计算过程。     

PTA回转干燥机的工艺设计

以某1000kt／a PTA国产化依托项目中精制干燥机为例,在研究了PTA工业装置中回转蒸汽列管式干燥机的工作原理和干燥机理、综合分析现有工业装置精制干燥机的设计与标定数据、实际物料干燥实验数据的基础上,总结了回转蒸汽列管式干燥机工艺设计方法,提出干燥机物料停留时间、总传热系数等关键设计参数的计算方法。设计结果已应用于实际项目的工程设计中。     

蒸汽管回转干燥机不凝汽排放结构改进研究

针对某公司高密度聚乙烯(HDPE)装置中的蒸汽管回转干燥机不凝汽排放遇到的问题,在原蒸汽管道分布初次改造的基础上提出新的改进方案,并对该方案下的结构建立有限元模型,利用ANSYS软件进行了结构和最大应力点的疲劳分析。结果表明,改进后的结构强度可以满足设备连续运行的要求。     

蒸汽煅烧炉在碳酸钙干燥中的应用

分析了用蒸汽为热源干燥轻质碳酸钙的可能性 ,对煅烧炉内传热翅片管及其分布重新改进设计 ,利用原有碳酸钙烟道气回转干燥机改造成基本适合干燥轻质碳酸钙的蒸汽干燥机。试验表明 :在湿滤饼含水分高达 4 0 %的情况下 ,不加返料 ,可生产出含水分≤ 0 .4 %的符合HG2 2 2 6— 91一级品标准的轻质碳酸钙 ;与外型尺寸相同的干燥设备相比 ,能力翻了一番     

粒状肥料专用回转式多筒烘干机

分析粒状钙镁磷肥采用传统单筒烘干机不能达到出口产品标准的原因,介绍将传统回转式单筒烘干机改造成回转式多筒烘干机的设备结构和使用效果。改造后的多筒烘干机可使颗粒肥产品粒度均匀,强度高,含水率低,成品率提高20~30百分点,特别适用于粒度1~5 mm产品的烘干。     

蒸汽管回转干燥机在铅精矿干燥中的应用

介绍了铅精矿蒸汽管回转干燥机系统的工艺流程，针对铅精矿的特性，对干燥系统的进料方式、密封形式、除尘器、冷凝水排放系统进行了设计改进。该干燥系统运行稳定、易于操作，各项运行指标达到设计值，并且生产负荷可在30％～110％范围内调节。     

INDIRECT THERMAL DRYING OF LIGNITE: DESIGN ASPECTS OF A ROTARY DRYER

An investigation of the thermal drying of lignite has been carried out, by using an indirect heat pilot rotary drum. The process aims at the production of dry lignite and clean steam as part of a gasification procedure. Both flighted and bare drum modes have been employed. Temperature profiles along the dryer length, the amount of evaporation (moisture conversion) and the solids residence time distribution (RTD) were measured. A non-isothermal model was tested under three different regimes of solids flow. Model integration, by taking account of experimental amount of evaporation at dryer exit and temperature profiles along the dryer length, has been utilized in the validation of drying kinetics and heat transfer correlations. Model predictions compare satisfactorily with the operating data of an indirect heat industrial lignite dryer. Overall heat transfer coefficients of the pilot rotary dryer were found to agree well with those reported for direct heat dryers.     

新型干燥工艺在间苯二甲酸生产中的应用

介绍了新型组合干燥工艺在间苯二甲酸生产中的应用,重点阐述了桨叶干燥机-蒸汽管回转干燥机的工艺流程及干燥设备,分析了组合干燥工艺的特点。新系统投用后的一年内,没有物料堵塞和黏壁现象发生,未因干燥机碱洗造成COD超标,装置负荷率由80%提高到100%。     

INDIRECT THERMAL DRYING OF LIGNITE: DESIGN ASPECTS OF A ROTARY DRYER

ABSTRACT

An investigation of the thermal drying of lignite has been carried out, by using an indirect heat pilot rotary drum. The process aims at the production of dry lignite and clean steam as part of a gasification procedure. Both flighted and bare drum modes have been employed. Temperature profiles along the dryer length, the amount of evaporation (moisture conversion) and the solids residence time distribution (RTD) were measured. A non-isothermal model was tested under three different regimes of solids flow. Model integration, by taking account of experimental amount of evaporation at dryer exit and temperature profiles along the dryer length, has been utilized in the validation of drying kinetics and heat transfer correlations. Model predictions compare satisfactorily with the operating data of an indirect heat industrial lignite dryer. Overall heat transfer coefficients of the pilot rotary dryer were found to agree well with those reported for direct heat dryers.     

PTA装置氧化回转蒸汽列管干燥机腐蚀失效分析

PTA装置氧化回转蒸汽管干燥机因腐蚀等原因造成加热管和筒体多次泄漏 ,通过对加热管进行取样分析 ,查找腐蚀失效机理 ,为检修提供了依据     

PTA装置氧化干燥机更新改造

介绍了PTA氧化装置的关键设备——密闭型蒸汽管回转干燥机的结构特点,针对原装置存在的问题并结合厂家要求提出了合理的更新方案,试运转效果良好。     

HYBRID NEURAL APPROACHES FOR MODELLING DRYING PROCESSES FOR PARTICULATE SOLIDS

This work presents methods for synthesizing drying process models for particulate solids that combine prior knowledge with artificial neural networks. The inclusion of prior knowledge is investigated by developing two applications with the data from two indirect rotary steam dryers. The first application consisted in the modelling of the drying process of soya meal in a batch indirect rotary dryer, The external and internal mass transfer resistances were associated in the hidden layer of the network to linear and sigmoidal nodes, respectively. The second application consisted in the modelling of the drying process of soya meal in a continuos indirect rotary dryer. The model was constructed using the Semi-parametric Design Approach. The model predicts the evolution of solid moisture content and temperature as a function of the solid position in the dryer. The results show that the hybrid model performs better than the pure “ black box” neural network and default models. They also shows that prior knowledge enhances the extrapolation capabilities of a neural network model,