高方平筛的筛路

以通俗易懂的语言介绍高方平筛筛路的基本理论、筛路的类型、筛路组合的方法、常见筛路、筛格组合的形式及筛路图的理解和绘制.     

平筛筛理效率评价指标的探讨

本文就面粉厂目前采用的几种评价平筛筛理效率的指标，面粉筛净率、未筛净率、粉筛筛上物含粉率的理论公式及实测结果进行了详细地分析，结果表明，以面粉的未筛净率作为评价平筛筛理效率的指标，能弥补其他指标的不足，可较准确地反映出平筛的实际筛理效率，并提出了检测的方法及计算公式。     

弧形筛的原理,结构和使用

弧形筛（BowScreen）又称DSM（DishedScreenMachine）筛或曲筛，是国外近年来竞相开发的一种高效、节能的脱水浓缩设备。它具有构造简单、没有转动及振动部件、操作维修方便、脱水浓缩效率高等优点，已被广泛用于造纸工业的纸浆浓缩、废纸脱墨洗涤、白水回收和废水预处理中。1工作原理弧形筛是利用泵送流体切向喷入弧形筛面，依靠离心力和重力分离固形物和液体。同时，借助分离出来的固形物的滚动和液体的水力冲刷作用来清洗滤网，起到自净作用。在流体顺着筛面向下流动的过程中，固形物与滤网接触面不断改变，既有利于水分均匀流出，又…     

溜筛在小麦清理过程中的应用浅议

溜筛具有无需动力、噪音小、维修方便、移动灵活、成本低、能自制等特点 ,因此一些制粉企业 ,特别是一些经济条件有限的中小型企业 ,根据自身特点利用好溜筛 ,能起到事半功倍的效果 ,下面是笔者在实践中运用的体会。1　溜筛的工作原理静止的物料在溜筛筛面上向下滑动 ,只有当物料重力在沿筛面的分力足以克服物料对筛面的摩擦力时才产生 ,如下图。即　Ｇｓｉｎα >ｆＧｃｏｓα由上式　ｓｉｎαｃｏｓα>ｆ或　ｔｇα >ｔｇρ亦即　α >ρ以上　Ｇ———物料的重力α———筛面的倾斜角度ｆ———物料对筛面的摩擦系数ρ———对应于摩擦系数…     

棒条式压力筛筛鼓制造过程的质量控制

筛鼓是压力筛的重要部件,筛鼓质量的好坏直接影响筛选效率、筛选质量及筛鼓本身的寿命。本文从棒条式压力筛筛鼓制造过程的质量控制角度进行阐述,包括压力筛筛鼓的结构组成、筛鼓零部件加工过程的质量控制、筛鼓组装焊接及整体加工过程的质量控制以及筛鼓成品的质量检测等。     

新式压力筛及其应用

常规压力筛（图1）转子上有螺旋线相间等距排列的半球形凸起物（SemisphericalProtrusions）做为压力脉冲元件。转子旋转产生的压力脉冲，做为筛浆和清洗筛板（鼓）的动力。但这种脉冲的强度和通过某一点持续的时间不足，因而限制了筛选浓度、产量和筛选效率的提高。新式压力筛（图2）转子上是脉冲块。它产生的压力脉冲的强度和通过某一点所持续的时间较长，因而大大提高了筛选浓度、产量和筛选效率。现分述如下：1筛鼓为提高良浆的洁净程度，新式压力筛筛孔和筛缝两种筛鼓的开口尺寸都缩小了，如对针叶水化学浆的筛选孔型，筛鼓孔径由常现…     

合金铝平筛筛格

制粉设备的材料由以木材为主，逐渐改为性能优良的金属材料。目前平筛筛格的制作仍以木材为主。含金铝筛格攻克了多项技术难关，己在国内研制成功。铝筛格与木筛格比较具有更多的优点，并有望取代木筛格。     

平筛筛路组合变换

从扩大型筛格的应用,阐述高方平筛筛路的变化,并对筛路的多种组合方式进行了讨论。     

压力筛浆机及其筛板的新发展

近十年来压力筛桨机及其筛板有了飞速的发展，波形筛板和齿形筛板的应用为提高压力筛筛浆能力和筛浆洁净效率起到了关键性的作用。本文综述了近年来压力筛浆机及其筛板的新发展，并例举了压力筛应用实例。     

小型抖筛机的参数试验与研究

介绍了小型抖筛机试验参数的确定方法，进行了筛分效果对比试验，根据试验结果确定了抖筛筛分的最佳工作参数。     

Monitoring and modelling of starch cake washing

This study describes the washing of starch filter cakes in a filter press, and shows an easy, simple and reliable method for the prediction of starch cake washing. The specific properties of starch particles that affect the filtration behaviour are introduced, as well as the starch pressure filtration process cycle, the monitoring of the cake washing process in a filter press, the sampling of the filter cake, and the modelling of the washing process. The monitoring of the washing process for industrial‐scale cake washing operations is quite difficult, and a prediction of the result is needed. The use of the simple model in predicting the washing process is for the purpose of making the washing process easier. The results obtained show that the starch cake washing can be effectively carried out in a filter press and the behaviour of the starch cake during washing can be interpreted with the washing models if the filtration properties of that starch are known.     

面团发酵过程中小麦淀粉理化性质的变化

以小麦粉为原料,结合水洗和离心提取小麦淀粉,研究面团发酵过程中一次发酵、二次发酵和醒发工序对直链淀粉含量、溶解度、溶胀度、糊化特性和凝胶特性等理化性质的影响。试验结果表明:发酵后直链淀粉质量分数提高3.7%～8.18%;采用黏度速测仪(RVA,Rapid visco analyzer)分析醒发后小麦淀粉的峰值黏度、谷值黏度和最终黏度分别上升52 RVU、58.67 RVU和73.33 RVU;采用质构仪(TPA,Texture profile anal-ysis)对发酵过程小麦淀粉凝胶特性进行研究,发现醒发后凝胶特性有所改善,硬度提高48.60 g,弹性提高0.03,内聚性、回复性分别提高0.05、0.15。     

The Efficiency of Hydrocyclones for the Separation of Different Starches

Since many years the starch industry uses hydrocyclones to purify starch. The starch is washed countercurrently with water in a number of washing stages. For a good washing effect, in each stage a separation of starch and impurities must be obtained. Different methods can be used to describe the efficiency of separation. As most suitable, the reduced grade efficiency is chosen. This efficiency is quantified for different starches: maize, potato, rice, wheat. From the measured efficiencies, relative sizes for washing batteries are calculated. The results correlate well with existing plant practices. The influence of starch damage on the separation efficiency was also investigated. Damaged starch appears more difficult to separate.     

Five Years of Experience with the Application of Reverse Osmosis on Light Middlings in a Corn Wet Milling Plant

Corn wet milling is a water intensive operation. A modern corn wet milling plant typically uses 1,5 m³ of fresh water per t of corn. Much of this added water must subsequently be removed by processes that are energy intensive to varying degrees. A major breakthrough in reducing the water consumption of the corn wet milling process was made when A. Cicuttini perceived the idea of using reverse osmosis more upstream in the corn wet milling process, to recover pure water from light middlings, the overflow from the hydrocyclone starch washing system, and to re-use this water for starch washing. In doing so the direct relation between the amount of water used for washing the starch, and the amount of light steep water to be evaporated does no longer exist. A full size reverse osmosis system for this service has been installed in one of the CPC corn wet milling plants in 1982. In a first phase a reduction of the load to the steepwater evaporator of 50% has been obtained. Expansion of the reverse osmosis system enabled further reduction of the steepwater evaporator load down to 30% of the original value. The system has demonstrated its ability to operate in conjunction with a 9-stage starch washing section with a wet fresh water intake for starch washing, comparable to that of a 15-stage washing section, at the same high level of starch product quality, and at much lower energy cost. The disappearance of the direct link between fresh water consumption for starch washing and steep water evaporator load creates new possibilities for optimisation and flexibility in design and operation of corn wet milling plants.     

Stärkegewinnung aus konserviertem Kartoffelreibsel

Starch Production from Preserved Potato Gratings. During industrial starch production potato gratings are produced which can be preserved by the addition of a 1.2% sodium hydrogensulfite solution. Preserved this way the durability of the gratings is defected neither by extreme differences in temperature nor by storage of 6 months and even longer. After storage the gratings can be returned into the industrial process to obtain the starch by washing out. The quality of this starch differs from the quality of potato starch washed out from non-preserved gratings: The pH-value is somewhat lower and the hot paste viscosity is slightly reduced. Contrary to this the typical curve of potato starch in the Brabender-Viscograph remains the same.     

超声波作用对木薯淀粉化学反应性能的影响

淀粉颗粒内部具有结晶区和非结晶区,淀粉的变性化学反应主要发生在非结晶区。实验表明,超声波作用的木薯淀粉颗粒基本保持着原木薯淀粉的颗粒形状,而木薯淀粉颗粒的偏光十字特征减弱或消失;超声波作用没有破坏木薯淀粉分子的原有的结构,没有新的化合物产生,经超声波作用后的木薯淀粉的红外结晶指数下降,木薯淀粉颗粒表面不再圆滑平整,说明超声作用破坏了木薯淀粉颗粒表层结晶结构。超声波作用后的木薯淀粉与原木薯淀粉分别合成羟丙基淀粉,羟丙基淀粉的取代度分别为0.1895与0.0725,说明经超声波作用后的木薯淀粉的反应性能增强,因为超声波作用后的木薯淀粉颗粒结晶结构被破坏,反应试剂更容易进入淀粉颗粒内部进行反应,反应性能得到了提高。     

Integrated Starch Plant for Alternative Processing of Maize and Potatoes

The emphasis of this paper is on the starch plant, in order to indicate how a great portion of the wet-milling equipment and all the dryers are used for two raw materials. The flowsheet for maize is the standard Dorr Oliver flowsheet. The primary separation of starch and gluten takes place in a merco separator. The same machine is applied for the separation of the effluent from the crude potato starch milk. The maize gluten concentration takes place in a gluten concentrator. The same machine is used for the recovery of the starch from the overflow of the first stage of starch washing when producing potato starch. The 7-stage fibre washing system is used for both maize starch and potato starch. The starch washing systems is used for both starches too.     

缢蛏振动筛分装置的优化与试验

目的：提高缢蛏壳肉分离效率。方法：采用参数法对振动筛分装置主要参数进行设计,以连云港双头蛏为试验对象,以振动频率、振幅、筛面倾角为试验因素,以筛分效率和肉中带壳比率为主控目标进行单因素试验,利用Design-Expert 软件对试验结果进行方差分析,建立频率、振幅、筛面倾角与筛分效率和肉中带壳比率相匹配的回归模型。采用响应面优化分析法,得到了缢蛏壳肉分离筛分装置的最佳工作参数匹配。结果：当出料比率控制为1.2 kg/s、开壳比率控制为97%,振动频率设定为21.6 Hz、振幅设定为3.6 mm、筛面倾角度设定为9°时,缢蛏筛分效率为97.60%,肉中带壳比率为4.52%。结论：所设计的缢蛏振动筛分装置筛分效率高、适应性好,可满足初步加工要求。     

多孔淀粉的制备与应用研究进展

多孔淀粉是一种具有大量孔洞结构分布在表面或者贯穿整个淀粉颗粒的改性淀粉,具有高孔隙率、高比表面积、吸附性强、负载量大等优越性能。本文主要介绍多孔淀粉的制备方法、结构与理化性质和应用情况等。目前多孔淀粉的制备方法主要有物理法、化学法、生物法和复合法。复合法是最为有效的一种。相比于原淀粉,多孔淀粉的结构和理化性质均发生变化,并且受淀粉的来源、酶的种类和加工条件等因素的影响。得益于其特殊的理化性质,多孔淀粉可被广泛用于食品、医药、农业、化工和环保等领域。     

漂白化学木浆筛选洗涤工艺流程的技术改造

通过将筛选洗涤工艺流程由先筛后洗改造为先洗后筛，同时把精选段置于氧脱木素之后、孔筛换成缝筛，并增加高浓除渣器等技改措施，在漂白化学木浆生产线上把产量由180adt/d(风干)提高到230adt/d，漂后浆质量优于国家标准，筛选排污负荷大幅降低。