本文選題：循環(huán)水 + 阻垢緩蝕劑��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：循環(huán)冷卻水系統(tǒng)是工業(yè)耗水中節(jié)省用量水的重要途徑。伴隨冷卻水的連續(xù)運(yùn)行,水系統(tǒng)中具有結(jié)垢趨勢的礦物質(zhì)濃度不停增長。過量的成垢離子富集會(huì)在管道表面產(chǎn)成沉積水垢,影響傳熱效率、產(chǎn)生垢腐蝕。投加聚合物阻垢緩蝕劑可有效解決此種難題。水處理劑必須達(dá)到一定濃度才能起到最佳的阻垢緩蝕效果,因此要實(shí)時(shí)監(jiān)測循環(huán)水中阻垢劑的含量確保最佳濃度范圍,從而達(dá)到阻垢、經(jīng)濟(jì)、環(huán)保的目的。本課題采用濁度法和膠體滴定法兩種不同原理的測定方法分析循環(huán)水中聚合物的濃度含量。研究了這兩種方法的適用條件和優(yōu)弊性,從而對于不同循環(huán)水體系采用相應(yīng)的分析測定方法。本實(shí)驗(yàn)得出的主要結(jié)論如下:(1)在一定質(zhì)量濃度范圍內(nèi),采用濁度法和膠體滴定法對各種聚合物阻垢劑測定時(shí),阻垢劑濃度與吸光度值、聚二甲基二烯丙基氯化銨(PD)消耗的體積值均具有較強(qiáng)的線性相關(guān)性。(2)濁度法最佳測定條件、影響因素及消除PAA最佳試驗(yàn)條件:PD濃度16 mg/L,pH為3.50～5.50,穩(wěn)定時(shí)間30 min,在410 nm處測吸光度,PAA濃度與吸光度呈現(xiàn)杰出的線性相關(guān)性R2=0.9950。共存的鹽類及銅緩蝕劑于正常使用濃度內(nèi)對PAA的檢測均無影響。PO43-和含膦阻垢劑會(huì)對PAA的測定產(chǎn)生影響,研究發(fā)現(xiàn),用Ca(OH)2調(diào)溶液pH值大于12,通過滴加0.75 ml 200 g/L Al2(SO4)3試劑可基本消除影響,檢測限為1.04 mg/L。TH-2000最佳測試條件:PD濃度28.8mg/L,PH為4.50-7.00,穩(wěn)定時(shí)間45min于425 nm處測吸光度,TH-2000濃度與吸光度線性相關(guān)性R2=0.9990。如同對PAA測定,P043-和含膦阻垢劑對溶液的測定有干擾,其他共存物質(zhì)均無影響,加入Al2(SO4)3可基本消除PO43-和含膦阻垢劑的影響,檢測限為0.448 mg/L。PASP最佳試驗(yàn)條件:PD濃度35.2 mg/L,pH為8.50～10.50,穩(wěn)定時(shí)間25 min后于420 nm處測吸光度,PASP濃度與吸光度的線性相關(guān)性R2=0.9955。與PAA和TH-2000測定一樣,PO43-和含膦阻垢劑會(huì)產(chǎn)生影響,通過加入Al2(SO4)3可基本消除影響,其他共存物質(zhì)影響可忽略,檢測限為0.738 mg/L。(3)膠體滴定法最佳測定條件、影響因素及消除PAA最佳試驗(yàn)條件:PD濃度40mg/L,pH為8.00～11.00,滴定速度小于0.100 mL/s,PAA濃度與消耗的PD體積具有較強(qiáng)的線性相關(guān)性R2=0.9692。Ca2+、Mg2+除外,體系剩余的鹽類離子及水處理劑對PAA的測定影響可以忽略。伴隨EDTA二鈉的加入(物質(zhì)的量比EDTA二鈉:Ca2+或Mg2+略大于1:1)即可削弱Ca2+、Mg2+對PAA測定的影響,檢測限為10mg/L。TH-2000最佳試驗(yàn)條件:PD濃度40 mg/L,pH為9.00～11.00,滴定速度不大于0.050 mL/s,TH-2000濃度與消耗PD體積的線性相關(guān)性R2=0.9869。與PAA測定類似,Ca2+、Mg2+對測定有影響,按物質(zhì)的量比(EDTA二鈉:Ca2+或Mg2+)至少為1:1添加EDTA二鈉,即可減弱Ca2+、Mg2+對測定的干擾,該方法的檢測限為16 mg/L。PASP最佳試驗(yàn)條件:PD濃度40mg/L,pH為8.50～11.00,滴加速度控制0.025mL/s內(nèi),PASP濃度與消耗PD體積的線性相關(guān)性R2=0.9787。共存鹽類離子和水質(zhì)穩(wěn)定劑在正常質(zhì)量濃度范圍內(nèi)對測定影響可以忽略。同樣Ca2+、Mg2+對PASP的測定產(chǎn)生一定影響,通過添加EDTA二鈉,即可削弱Ca2+、Mg2+對實(shí)驗(yàn)測定產(chǎn)生的影響,該方法的檢測限為10 mg/L。(4)分析比較兩種方法發(fā)現(xiàn),濁度法準(zhǔn)確性好、精密度較高,檢出限低,對于低濃度的阻垢劑仍能檢測;膠體滴定法操作簡單費(fèi)用低,實(shí)用性強(qiáng),但檢出限略高,適用于較高濃度阻垢劑的測定。這兩種方法的確立,有利于循環(huán)水中聚合物含量及時(shí)準(zhǔn)確測定,促進(jìn)在線監(jiān)測系統(tǒng)的完善,為循環(huán)水系統(tǒng)阻垢劑的監(jiān)測提供理論和實(shí)踐經(jīng)驗(yàn)。
[Abstract]:The circulating cooling water system is an important way to save water in the industrial water consumption. With the continuous operation of cooling water, the concentration of minerals in the water system keeps increasing. Excessive accumulation of scale ions will produce sedimentary scale on the surface of the pipe, affect the heat transfer efficiency and produce scale corrosion. The water treatment agent must reach a certain concentration in order to achieve the best effect of scale inhibition and corrosion. Therefore, it is necessary to monitor the scale of the scale inhibitor in the circulating water to ensure the optimum concentration range, so as to achieve the purpose of scale inhibition, economic and environmental protection. This subject uses two different principles of turbidity and colloidal titration. The concentration of polymer in circulating water. The applicable conditions and advantages and disadvantages of these two methods are studied, and the corresponding analytical methods are used for different circulating water systems. The main conclusions of this experiment are as follows: (1) the determination of various polymer scale inhibitors by turbidimetric and colloidal titration in a certain mass concentration range. The concentration and absorbance value of the scale inhibitor, the volume value of the consumption of poly two methyl diallyl ammonium chloride (PD) have strong linear correlation. (2) the optimal determination conditions of the turbidity method, the influencing factors and the best experimental conditions for the elimination of PAA: the concentration of PD is 16 mg/L, pH is 3.50 ~ 5.50, the stable time is 30 min, the absorbance is measured at 410 nm, PAA concentration and absorbance are presented. The salt and copper corrosion inhibitor coexisting with outstanding linear correlation R2=0.9950. have no effect on the detection of PAA in normal concentration,.PO43- and phosphine containing scale inhibitor will affect the determination of PAA. The study found that the pH value of Ca (OH) 2 solution is greater than 12, and the effect can be basically eliminated by adding 0.75 ml 200 g/L Al2 (SO4) 3 reagents, and the detection limit is 1.04 m. G/L.TH-2000 best test conditions: PD concentration 28.8mg/L, PH 4.50-7.00, stability time 45min at 425 nm measurement absorbance, TH-2000 concentration and absorbance linear correlation R2=0.9990. as PAA determination, P043- and phosphine scale inhibitor have interference to the determination of solution, other coexisting substances have no effect, adding Al2 (3) can basically eliminate and contain phosphine The influence of scale inhibitor is the optimum test condition of 0.448 mg/L.PASP: the concentration of PD is 35.2 mg/L, pH is 8.50 ~ 10.50, the stability time is 25 min at 420 nm, and the linear correlation between PASP concentration and absorbance R2=0.9955. is the same as PAA and TH-2000, and PO43- and phosphine containing scale agent will have an effect. In addition to the influence, the influence of other coexisting substances is negligible, the detection limit of 0.738 mg/L. (3) colloid titration is the best condition, the influencing factors and the best experimental conditions for eliminating PAA are: PD concentration 40mg/L, pH is 8 ~ 11, titration speed is less than 0.100 mL/s, PAA concentration and PD volume consumed are strong linear correlation R2=0.9692.Ca2+, Mg2+ except for the body. The influence of the remaining salt ions and water treatment agents on the determination of PAA can be ignored. With the addition of EDTA two sodium (the amount of substance than EDTA two sodium: Ca2+ or Mg2+ is slightly greater than 1:1), the effect of Ca2+ and Mg2+ on PAA determination is the best test condition for 10mg/L.TH-2000: PD consistency 40 mg/L, 9 ~ 11, titration speed less than 0.050 The linear correlation between the concentration of L/s, TH-2000 and the consumption of PD volume is similar to that of PAA. Ca2+ and Mg2+ have an effect on the determination. The determination of interference by the mass ratio (EDTA two sodium: Ca2+ or Mg2+) at least 1:1 EDTA two can be reduced. The detection limit of this method is 16. ~ 11, drop acceleration control 0.025mL/s, PASP concentration and linear correlation of PD volume consumption R2=0.9787. coexisting salt ions and water quality stabilizers in normal mass concentration range can be ignored. Similarly Ca2+, Mg2+ has a certain effect on the determination of PASP, by adding EDTA two sodium, can weaken Ca2+, Mg2+ to experimental determination The detection limit of the method is 10 mg/L. (4) analysis and comparison of two methods. It is found that the turbidimetric method has good accuracy, high precision, low detection limit, and can still be detected for low concentration scale inhibitor; the colloid titration is low cost and practical, but the detection limit is high, which is suitable for the determination of high concentration scale inhibitor. These two methods It is beneficial to the timely and accurate determination of polymer content in circulating water, promote the improvement of on-line monitoring system, and provide theoretical and practical experience for monitoring the scale inhibitor of circulating water system.

【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ085.4

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