专利摘录

专利名称：微型快速真空冷冻干燥器及其干燥方法;专利名称：智能型烘房风机回转供风系统;专利名称：药物颗粒的连续生产[编者按]     

气体再循环式台车烘房

一、前言我国目前大型注浆品种,普遍采用地坑烘房及蒸气热管式烘房。该类烘房内气体流动速度很慢,干燥时间较长,而且大大影响坯体干燥速率。景德镇高档瓷指挥部采用“气体再循环式台车烘房”,用50～60℃低温热空气对尺四鱼盘、9寸斗碗、壶、品锅等产品进行干燥。该烘房利用热风炉换热后的热空气作为热源,经过引风机打入烘房下部。每间烘房顶部设有再循环风机进行废气循环,达到了烘房温差小,干燥时问短,干燥均匀的良好     

直燃式快速烘房在电瓷生产中的应用

近几年，由中机工程（西安）窑炉技术有限公司研制开发的直燃式快速烘房技术在电瓷行业一些有影响的工厂得到了迅速推广应用。普遍收到了降低干燥成本70％、干燥周期缩短40～50％、干燥合格率提高10％以上的经济技术效果。该项目的最大优点在于燃料的充分燃烧和利用。由中机工程（西安）窑炉技术有限公司设计制造的具有自主知识产权的燃烧机。可以保证干燥过程中等速干燥阶段的低温稳定运行。也可以满足降速阶段的快速升温对热量的要求。直燃式快速烘房的自动控制系统可以根据程序规定自动调节烘房温度以及排湿操作。文中对烘房的结构特点也做了简要介绍。     

厢式皂片烘房的节能技术改进

新设计的厢式皂片烘房采用气流由下至上经五层带干燥型式,使烘房热效率明显提高,而单位蒸汽耗量降低,既保证皂片干燥质量,又提高了经济效益。     

对轻质碳酸镁生产系统的改造

我厂的主要产品轻质碳酸镁是以苦卤和碳化氨水为原料,在反应锅内进行反应,经离心机甩水洗涤蒸汽烘房干燥后得产品。针对原生产系统存在轻质碳酸镁在反应液中粒度细、离心机分离速度慢、滤饼含水量高、原料消耗高蒸汽烘房生产能力低等问题,我     

对中缸厚壁制品快速干燥的几点认识

一、前言缸类厚壁制品的干燥是日用陶生产过程中的薄弱环节.目前日用陶生产普遍采用原料机械化加工和隧道窑连续烧成,生产效率大大提高.而成型干燥仍采用人工自然干燥和平面烘房为主的慢速干燥落后工艺.一般认为平面烘房的坑面高温烫底,粉状垫层吸水和周期翻坯等技术措施,是确保干燥质量的关键,与人工自然干燥相比较,生产周期短,坯件开裂缺陷少,生产管理方便,因此各厂大多使用平面烘房为主要干燥设备,尤其是坯件的后期干燥阶     

废气循环干燥器的热量衡算

目前,烘房除原有的蒸汽加热空气的型式外,还有新设计的烟道气间接给热烘房。在设计此类烘房过程中,有二个主要问题,就是这种废气循环干燥器的热量衡算和烘房热损失的数据问题。本来在一般化工教材中对于不带废气循环的干燥器是有推导公式的,但对于带部分废气循环的热量衡算式就未列出。这在鲁利耶著的《干燥作业》中没有,就是1972年出版的R.B.Keey新著《干燥原理与应用》     

匣钵烘房利用烟道余热

为了节约能源,我厂继采取隧道窑的全保温,冷却带设余热锅炉,原油掺水乳化等节能措施之后,又采取了将烟道的烟气余热供匣钵烘房干燥节能措施,每月节约20吨优质大同煤块。做法是把烟道适当加长,并在烟道上复设金属散热板,金属散热板的一侧接触烟气,吸收余热,金属板的另一侧与烘房空间相通,从而完成烘干匣钵的目的,如图一。     

立德粉生产干燥、焙烧新工艺

我厂是以生产立德粉(锌钡白)为主的工厂。产品大部份出口。长期以来,立德粉的干燥和焙烧,是用传统的间接热风烘房和反射炉。间接热风烘房的干燥和反射炉的焙烧需用庞大的设备、生产能力低而且生产间断、劳动强度很大。近年来,为了使干燥和焙烧实现连续生产并强化生产的目的。天津、上海等地的     

日用陶器中缸快速干燥试验

一、前言江苏宜兴日用陶器缸类制品的干燥,目前靠自然干燥和地坑烘房。以6号长缸(φ540×550)为例,刀板制缸机成型的湿坯相对水份为18～19%,采用地坑烘房,干燥到2%以下入窑,干燥周期长达72小时。我公司于1979年底研制成功一台“TCZG—60中缸滚压成型气电脱模联合机”,     

Shell煤气化磨煤干燥系统常见问题分析及解决

阐述Shell煤气化工艺磨煤干燥系统流程,磨煤干燥系统主要设备循环风机和磨煤机进行简介,Shell煤气化磨煤干燥系统试车及运行过程中实际遇到问题的原因浅析及采取相应措施解决问题达到稳定运行目的。     

Analysis of CO2 Transcritical Cycle Heat Pump Dryers

The heat pump dryer with CO₂ as the working medium is investigated in this study. The drying systems were designed based on the thermophysical properties and characteristics of CO₂ cycle. The two-stage drying of CO₂ transcritical cycle heat pumps are presented and discussed in comparison with the single compression cycle single-stage heat pump dryer, the two-stage drying heat pumps, and electric drying system. The analysis indicates that the specific moisture extraction ratio of the two-stage drying system can be higher than that of the single drying CO₂ system. The efficiency of energy utilization of the CO₂ heat pump dryer was higher than that of an electric dryer.     

A STUDY OF CLOSED CYCLE DRYING FOR THE COATED FILM WITH ORGANIC SOLVENT ON THE CONTINUOUS SHEET MATERIALS

The conventional drying of the coated film with organic solvent on continuous sheet materials is usually performed in open or one pass drying system using air as the drying medium. The concentration of evaporated organic solvent in the drying system must be low enough to prevent explosion and large volume of off gas from dryer to solvent recovery system is required, resulting in poor heat economy for all the plant

To improve the heat economy of the plant it had been proposed to use a closed cycle drying system, where an inert gas, e.g. nitrogen, is used as the drying medium. High concentration of the organic solvent in the recycle gas mixture may then be used, which results in smaller volume of recycle gas and possibility of applying an inexpensive solvent recovery system of dehumidification. This investigation includes two important problems to realize the closed cycle drying

(1)Measurement of solvent (toluene) evaporation rate from coated film in the gas mixture of toluene andnitrogen over a wide range of toluene/nitrogen ratios (0-1.0) and drying temperature using bench scaleapparatus

(2)Development of a contactless sealing method, using an inert gas, for closed cycle drying of continuoussheet materials. The results of preliminary tests demonstrate its feasibility.     

A STUDY OF CLOSED CYCLE DRYING FOR THE COATED FILM WITH ORGANIC SOLVENT ON THE CONTINUOUS SHEET MATERIALS

The conventional drying of the coated film with organic solvent on continuous sheet materials is usually performed in open or one pass drying system using air as the drying medium. The concentration of evaporated organic solvent in the drying system must be low enough to prevent explosion and large volume of off gas from dryer to solvent recovery system is required, resulting in poor heat economy for all the plant

To improve the heat economy of the plant it had been proposed to use a closed cycle drying system, where an inert gas, e.g. nitrogen, is used as the drying medium. High concentration of the organic solvent in the recycle gas mixture may then be used, which results in smaller volume of recycle gas and possibility of applying an inexpensive solvent recovery system of dehumidification. This investigation includes two important problems to realize the closed cycle drying

(1)Measurement of solvent (toluene) evaporation rate from coated film in the gas mixture of toluene andnitrogen over a wide range of toluene/nitrogen ratios (0-1.0) and drying temperature using bench scaleapparatus

(2)Development of a contactless sealing method, using an inert gas, for closed cycle drying of continuoussheet materials. The results of preliminary tests demonstrate its feasibility.     

CO2跨临界循环特性对热泵干燥系统的影响

对CO2跨临界循环的超临界放热特性和运行规律进行了分析,根据这些特性,对其应用于干燥热泵系统进行了探讨,并对蒸发温度、过热度及气体冷却器出口温度对系统除湿率的影响做出分析。研究表明CO2跨临界循环放热段存在大的温度滑移,气体冷却器出口温度低有利于系统运行,这些特点非常适合干燥系统,而且干燥系统除湿率也受到这些特性的影响,系统存在最优运行压力和最佳的蒸发温度与气体冷却器出口温度组合。     

LIFE CYCLE ASSESSMENT OF AN ENERGY-SYSTEM WITH A SUPERHEATED STEAM DRYER INTEGRATED IN A LOCAL DISTRICT HEAT AND POWER PLANT.

Life cycle assessment (LCA) is a method for analysing and assessing the environmental impact of a material, product or service throughout the entire life cycle. In this study 100 GWh heat is to be demanded by a local heat district. A mixture of coal and wet biofuel is frequently used as fuel for steam generation (Case 1). A conversion of the mixed fuel to dried biofuel is proposed. In the district it is also estimated that it is possible for 4000 private houses to convert from oil to wood pellets. It is proposed that a sustainable solution to the actual problem is to combine heat and power production together with an in improvement in the quality of wood residues and manufacture of pellets. It is also proposed that a steam dryer is integrated to the system (Case 2).

Most of the heat from the drying process is used to the municipal heating networks. In this study the environmental impact of the two cases is examined with LCA. Different valuation methods shows that Case 2 is an improvement over Case 1, but there is diversity in the magnitudes of environmental impact in the comparison of the cases. The differences depend particularly on how the emissions of CO₂, NO_x and hydrocarbons are estimated. The impact of the organic compounds from the exhaust gas during the drying is estimated as low in all of the three used methods.     

ADC发泡剂生产工艺的改进

介绍了中平能化集团开封东大化工有限公司在ADC发泡剂生产中为实现安全生产所进行的工艺改进情况,改进后加强了对次氯酸钠反应温度、有效氯含量、氯化反应温度、氯气流量、通氯速度、干燥系统进出口温度、风机负压等工艺指标的监控.     

LIFE CYCLE ASSESSMENT OF AN ENERGY-SYSTEM WITH A SUPERHEATED STEAM DRYER INTEGRATED IN A LOCAL DISTRICT HEAT AND POWER PLANT.

Abstract

Life cycle assessment (LCA) is a method for analysing and assessing the environmental impact of a material, product or service throughout the entire life cycle. In this study 100 GWh heat is to be demanded by a local heat district. A mixture of coal and wet biofuel is frequently used as fuel for steam generation (Case 1). A conversion of the mixed fuel to dried biofuel is proposed. In the district it is also estimated that it is possible for 4000 private houses to convert from oil to wood pellets. It is proposed that a sustainable solution to the actual problem is to combine heat and power production together with an in improvement in the quality of wood residues and manufacture of pellets. It is also proposed that a steam dryer is integrated to the system (Case 2).

Most of the heat from the drying process is used to the municipal heating networks. In this study the environmental impact of the two cases is examined with LCA. Different valuation methods shows that Case 2 is an improvement over Case 1, but there is diversity in the magnitudes of environmental impact in the comparison of the cases. The differences depend particularly on how the emissions of CO₂, NO_x and hydrocarbons are estimated. The impact of the organic compounds from the exhaust gas during the drying is estimated as low in all of the three used methods.     

SOLAR ASSISTED DRIER FOR SEEDS

A high performance solar assisted seed dryer has been designed and constructed at a seed processing station in Hungary.

The dryer is arranged in a building specially designed for this purpose, the roof of it serves as solar air collector field. Two drying cells with individual fans of two RPM stages are formed in the building. Drying air preheated by the collector can optionally be distributed between the two drying cells. Material to be dried can be arranged either in a static bed or in containers depending on the requirements. Moist air leaving the bed streams out of the drying cells through openings of the side walls. As auxiliary air heater a natural gas generator is used.     

SOLAR ASSISTED DRIER FOR SEEDS

A high performance solar assisted seed dryer has been designed and constructed at a seed processing station in Hungary.

The dryer is arranged in a building specially designed for this purpose, the roof of it serves as solar air collector field. Two drying cells with individual fans of two RPM stages are formed in the building. Drying air preheated by the collector can optionally be distributed between the two drying cells. Material to be dried can be arranged either in a static bed or in containers depending on the requirements. Moist air leaving the bed streams out of the drying cells through openings of the side walls. As auxiliary air heater a natural gas generator is used.