【摘要】：循環(huán)冷卻水在循環(huán)過(guò)程中,由于水分不斷散失、溶解質(zhì)濃縮等眾多原因,造成換熱設(shè)備及管道內(nèi)出現(xiàn)結(jié)垢沉淀,致使換熱效率低下甚至引發(fā)事故。由于傳統(tǒng)化學(xué)阻垢方法存在二次污染、成本高等缺點(diǎn),物理阻垢方法成為趨勢(shì),其中纏繞式脈沖電磁場(chǎng)阻垢技術(shù)以操作簡(jiǎn)單、費(fèi)用低、見(jiàn)效快等優(yōu)點(diǎn)受到廣泛關(guān)注。本文基于水垢的形成機(jī)理,分析水垢形成的過(guò)程及影響因素,探究纏繞式脈沖電磁場(chǎng)阻垢機(jī)理。利用ANSYS模擬研究管材對(duì)管道內(nèi)電磁場(chǎng)強(qiáng)度的影響,確定PVC等非金屬非導(dǎo)磁材料應(yīng)作為纏繞式脈沖電磁場(chǎng)阻垢處理優(yōu)選的輸水管材;比較管徑、纏繞匝數(shù)對(duì)管道內(nèi)電磁場(chǎng)強(qiáng)度的影響,模擬結(jié)果表明50匝線圈和110 mm管徑配合使用,可以使纏繞式脈沖電磁場(chǎng)阻垢系統(tǒng)實(shí)現(xiàn)較大的性能功耗比;為纏繞式脈沖電磁場(chǎng)阻垢系統(tǒng)在實(shí)際工程中的高效應(yīng)用提供技術(shù)指導(dǎo)。針對(duì)纏繞式脈沖電磁場(chǎng)阻垢線圈的電磁場(chǎng)強(qiáng)度計(jì)算模型進(jìn)行研究,明確建立激勵(lì)線圈中電流計(jì)算模型的必要性。以纏繞式脈沖電磁場(chǎng)阻垢系統(tǒng)為研究對(duì)象,在激勵(lì)線圈等效電路基礎(chǔ)上,建立串聯(lián)電阻時(shí)激勵(lì)線圈中的電流數(shù)學(xué)模型,基于電流實(shí)驗(yàn)數(shù)據(jù),利用MATLAB擬合激勵(lì)線圈中等效電阻和等效電感隨頻率變化的關(guān)系式,進(jìn)而得到激勵(lì)線圈中電流計(jì)算模型,最終獲得纏繞式脈沖電磁場(chǎng)阻垢線圈的電磁場(chǎng)強(qiáng)度計(jì)算模型。通過(guò)兩組實(shí)驗(yàn)驗(yàn)證激勵(lì)線圈中電流計(jì)算模型的正確性和準(zhǔn)確性。在電磁場(chǎng)阻垢機(jī)理的基礎(chǔ)上,建立循環(huán)水纏繞式脈沖電磁場(chǎng)處理實(shí)驗(yàn)平臺(tái),通過(guò)實(shí)驗(yàn)對(duì)纏繞式脈沖電磁場(chǎng)阻垢機(jī)理進(jìn)一步研究,實(shí)驗(yàn)結(jié)果表明:在本實(shí)驗(yàn)條件下脈沖電磁場(chǎng)頻率為1 kHz時(shí),纏繞式脈沖電磁場(chǎng)阻垢系統(tǒng)的阻垢效果最為顯著。比較實(shí)驗(yàn)組與對(duì)照組發(fā)現(xiàn),使用1 kHz頻率的脈沖電磁場(chǎng)處理4個(gè)小時(shí)能夠增加約0.8倍的碳酸鈣結(jié)晶量,處理4個(gè)小時(shí)提高碳酸鈣的結(jié)晶速率約2.4倍;處理8個(gè)小時(shí)可以提高碳酸鈣在水中的溶解度約3倍。
[Abstract]:In the process of circulating cooling water, due to the continuous loss of water and concentration of dissolved matter, scaling and settling appear in the heat exchanger and pipeline, and the heat transfer efficiency is low and even causes accident. Because of the disadvantages of secondary pollution and high cost in the traditional chemical scale inhibition methods, physical scale inhibition methods have become a trend, among which the winding pulse electromagnetic field scale inhibition technology has been widely concerned because of its advantages of simple operation, low cost, fast efficiency and so on. Based on the formation mechanism of scale, this paper analyzes the process of scale formation and its influencing factors, and probes into the mechanism of scale inhibition by winding pulse electromagnetic field. The influence of pipe on the intensity of electric magnetic field in pipeline is studied by ANSYS simulation. It is determined that non-metal magnetic conductivity such as PVC should be used as the best selected pipe for scale inhibition treatment of winding pulse electromagnetic field. Comparing the influence of pipe diameter and winding number on the electric magnetic field intensity in the pipe, the simulation results show that the combination of 50 turns coil and 110 mm pipe diameter can make the winding pulse electromagnetic field scale inhibition system achieve a large power consumption ratio. It provides technical guidance for the efficient application of wound pulse electromagnetic field scale inhibition system in practical engineering. In this paper, the calculation model of electric magnetic field intensity of winding pulse electromagnetic field scale inhibitor coil is studied, and the necessity of setting up current calculation model in exciting coil is made clear. Based on the equivalent circuit of the exciting coil, the mathematical model of the current in the winding pulse electromagnetic field scale inhibition system is established, and the current experimental data are based on the mathematical model of the current in the exciting coil when the series resistance is in series. The relationship between the equivalent resistance and the equivalent inductance in the exciting coil with frequency is fitted by MATLAB, and the current calculation model in the exciting coil is obtained. Finally, the calculation model of the electric magnetic field intensity of the winding pulse electromagnetic field is obtained. The correctness and accuracy of the current calculation model in the exciting coil are verified by two groups of experiments. On the basis of the scale inhibition mechanism of electromagnetic field, the experimental platform of circulating water winding pulse electromagnetic field treatment was established, and the scale inhibition mechanism of winding pulse electromagnetic field was further studied through experiments. The experimental results show that when the frequency of the pulsed electromagnetic field is 1 kHz, the scale inhibition effect of the winding pulse electromagnetic field is the most remarkable. Comparing the experimental group with the control group, it was found that the crystallization rate of calcium carbonate was increased by about 0. 8 times and the crystallization rate of calcium carbonate was increased by about 2. 4 times after the treatment of 1 kHz frequency pulsed electromagnetic field for 4 hours. The solubility of calcium carbonate in water can be increased by about 3 times after 8 hours treatment.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TB490

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