抄数系统在产品设计和模具制造中的应用

介绍高速抄数机的基本结构、功能、工作流程以及在新产品开发,模具型腔、型芯设计和制造中的具体应用.     

我国印染助剂现状和今后发展的一点看法

印染助剂行业在４０多年发展中，其生产品种和应用领域不断扩大，已发展成被广泛研究、开发和生产的热门行业。本文着重对国内纺织印染助剂现状和发展提出一些看法和探讨意见。     

企业如何建立可持续发展战略

简介“可持续发展战略”的来由和我国的具体要求,介绍国外企业可持续发展的动态,提出５点建议供企业参考。     

化学工程学的发展趋势和在科学发展中的地位

化学工程学不仅是一个经典的工程技术学科 (四大工程技术学科 :建筑工程、机械工程、电子工程和化学工程之一 ) ,而且是进一步探索生命科学 (植物生理学和动物生理学 )的基础 ;在强调绿色经济 (即 :平衡发展 )的今天 ,化学工程学将会发挥出越来越大的作用。     

毛细管超临界流体色谱的进展

根据超临界流体的特点，评述了毛细管超临界流体色谱在仪器、应用方面的最新进展及其发展前景。     

我国色母粒的生产现状与发展趋势

本文介绍了我国色母粒的生产现状、存在的问题及今后的发展趋势,并提出了一些建议。     

炭黑生产工艺的进展

介绍了较为成熟的炭黑生产工艺,讨论了其各自在工业应用方面的前景,并对近年来涌现出的一些具有可应用前景的工艺方法进行了简要评述,同时也归纳了近几年炭黑生产工艺的进展表现。     

新时期景德镇陶瓷产业的保护与发展

景德镇陶瓷不仅历史悠久,而且品类众多,技艺精湛,文化内涵丰富。在手工业时代,它是生活的创造者;在当代,它成为历史文化的一种记忆和象征,以其独特形态自立于以现代设计为主体的科技文明之中,成为民族传统文化艺术的载体,发挥着从经济到艺术的多种功能。但是近些年来,在经济文化大发展的背景下,景德镇陶瓷产业却呈现总体不够景气、生产销售萎缩、工艺技术没有突破、后继无人等问题。我们应该清楚地认识到对于景德镇陶瓷产业的保护和发展的迫切性,以及改善现状、进行创新与应用的重要性,其保护与发展遭遇到了发展经济、技术更新和文化变迁等一系列矛盾,需要去探讨和研究。     

特种工程塑料聚芳醚酮

介绍了聚芳醚酮的发展概况、分类及其物化性能;重点对PEEK的性能及应用进行详细阐述;概述了PEEK 的最新研究成果,并指出其今后发展趋势。     

DEVELOPMENT AND VALIDATION OF A PROCESS SIMULATOR FOR DRYING SUBBITUMINOUS COAL

Drying subbituminous coal has never been practiced commercially. The commercial dryers built to date have been designed for drying surface moisture in conjunction with upstream coal preparation facilities. This type of drying is mainly controlled by input energy and the basis of the design is an energy balance. In drying inherent moisture from subbituminous coal, the thermal conductivity of the coal and the diffusion of molecular water within coal particles impose limitations on the process conditions. Energy input and solids residence time in the dryer have to be controlled properly for simultaneously balancing the heat and mass transfer within the coal particles. Improper control of either parameter can cause fires and explosions during the key steps of the drying process—drying and cooling

In parallel to the Anaconda coal drying pilot plant program, a cross-flow, fluid-bed coal drying/cooling process simulator was developed for: (1) understanding the drying phenomena on an individual particle basis; (2) analyzing potential risks and safety limits, and (3) designing the Anaconda pilot plant program

The development of the process simulator was based on both first principles and laboratory data and can be divided into two phases:

1 Development of a semi-mechanistic drying model for Powder River Basin subbituminous coal employing an analytical solution of the diffusion equation

2.Formulation of a fluid-bed cross-bed cross-flow dryer/cooler simulator employing simultaneous heat and mass transfer

This model was validated against process variables data taken on a 4 tph pilot plant. An operable range, or process envelope, has been developed through the pilot plant experience and the process simulation study. Based on the model predictions, an uncertainly range was defined in the design recommendations of a pioneer coal drying plant in scale-up.