结垢

In an aromatic complex unit ,the main cause for decrease in hydrogen compressor load was scale formation in steam condenser .

芳烃联合装置凝汽器的结垢是氢气压缩机负荷降低的主要原因。

Deliquescence of calcium sulfite under various conditions including temperature,pH,dissolving time,stirring rate and initial quantity was investigated in experiment.

亚硫酸钙的溶解浓度对氧化速率有非常重要的影响，课题主要研究CaSO3的溶解特性，描述了CaSO3在不同条件下(温度、pH、溶解时间T、搅拌速度、初始加入量等)溶解量的变化规律，进而找出CaSO3的最佳溶解条件，以达到提高氧化速率及石膏的生成率，防止堵塞和结垢的目的。

So the proposed method in this dissertation not only meet the requirements for fossil-fuel unit set in GB/T 12145-1999, but also can effectively restrain condensate and feed water system corrosion. Thereby the proposed method can reduce the loss by corrosion's leading accident, lower Fe content in boiler feed water, slow the boiler's scaling speed, delay boiler's chemical cleaning interval, effectively enhance unit's reliability, usability and using life and solve the problem of poisonous chemical deoxidant. So the proposed method can economize substantial expense for power plant.

所以，本文所提出的汽包炉有限氧化性水化学工况不但能满足GB/T12145-1999中对火力发电机组及蒸汽动力设备的要求，而且可有效抑制凝结水和给水系统的腐蚀，减少因这些部位腐蚀损坏而引发的事故停机损失，降低锅炉给水中的金属含量，减轻炉内的结垢速度，延长锅炉的酸洗间隔，有效提高机组的可靠性、可用率和使用寿命，同时也解决了有毒化学除氧剂的使用问题，为电厂节省大笔运行费用。

New type of water chemistry for utility drum boiler and its principle and characteristic Two kinds of water chemistry's main principle and characteristic are detailedly analyzed. Against the problem of high eroding speed, high Fe content in feed water and boiler water, high scaling speed, short chemical cleaning interval, needing poisonous chemical deoxidant, etc for drum boiler's deoxidization water chemistry and difficulty of using oxidation water chemistry, a new type of water chemistry is put forward on the basis of analyzing the characteristic of whole power station's water steam cycle system, principle of two kinds of water chemistry and their practical effect in every cycle stage. Considering two water chemistry's merit, a new water chemistry called Limited Oxidation Water Chemistry is put forward, which is a local slight oxidization no-deoxidant water chemistry. And the proposed method's principle, control parameter, applying condition, start-lay up and emergency measures are initially calculated and analyzed.

三、新型汽包炉水化学工况的提出及其原理和特点详细分析了国内外现行两大类水化学工况处理的核心原理和特点，针对现行汽包炉还原性水化学工况处理所存在的系统腐蚀速度相对较大、给水和炉水铁浓度高、锅炉结垢速度快、机组酸洗间隔短、无法避免有毒化学除氧剂的使用以及氧化性水化学工况在汽包炉机组上应用的困难等问题，在详细分析电站整个水蒸汽循环系统的特点、两类水工况处理的原理和对循环中各段处理的实际效果等的基础上，综合两者的优点，提出了一种新型的局部轻微氧化性无除氧剂汽包炉水化学工况－"汽包炉有限氧化性水化学工况"处理原理，并初步计算、分析和确定了该种新型水化学工况的主要工艺控制参数、应用条件、启停与紧急情况处理等。

When the accumulation of feces in the bowel leads to fecal encrustation , it is difficult for the colon to function normally and the glands in this lining cannot produce the necessary intestinal flora .

当积累的粪便在肠道，导致粪便结垢，是很难为结肠正常运作和腺体在这衬砌不能产生必要的肠道菌群。

Ordinary tap water in a range of materials , being heated easy Jiegou , which is home to the kettle used for a long time , a pot pipe on the same layer thick encrustation .

普通自来水中有多种物质，受热容易结垢，这就像家里的水壶使用时间长了，壶壁上就形成一层厚厚的水碱一样。

The problem of the heat power house pipe encrustation filthiness influences the normal running of dynamotors seriously .

热电厂输灰管道结垢问题影响发电机组的正常运行。

Surfactant/polymer flooding become a new flooding means, which can furthest exert viscoelasticity of polymer, decrease effect of emulsion and make a clean sweep of encrustation of stratum and mineshaft due to being alkali. In this paper several dozen kinds of surfactants were screened for the polymer/surfactant system.

表面活性剂／聚合物二元复合驱作为一种新的驱油方法，可以最大限度地发挥聚合物的粘弹性，减少乳状液带来的不利影响，彻底清除由于碱的存在引起的地层及井筒结垢现象。

The results indicated that the more vacuum is, the more degrees dropped of the filtrate temperature.

结果表明：真空过滤时真空度越高，磷酸料浆的温度下降越大，结垢越多。

The scaling on equipment and pipeline of WPA filtration unit is caused by the precipitation of potassium and sodium fluosilicate when the temperature of acid decreases.

分析湿法磷酸过滤设备与管道结垢的主要原因是氟硅酸钾，钠盐因磷酸液相温度下降而沉积下来。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐