再生水中水質(zhì)因子對不銹鋼管材的腐蝕影響及控制研究
發(fā)布時間：2018-11-11 15:52
【摘要】：本課題以熱電廠循環(huán)冷卻水系統(tǒng)為研究背景,以316L不銹鋼(Stainless steel 316L,SS316L)為研究材質(zhì),以取自北京高碑店再生水廠的二級出水的再生水作為研究介質(zhì),以硫酸鹽還原菌(Sulfate Reducing Bacteria,SRB)為研究菌種,采用水分析化學、生物化學、電化學和表面分析等方法,對北方4個代表性電廠(A、B、C、D)的再生水進行水質(zhì)分析和評估;研究了濃縮3倍循環(huán)水中Cl-、氨氮、SO42-對SS316L電化學腐蝕影響;研究了 4種阻垢緩蝕劑之間的協(xié)同效應以及對SS316L的緩蝕效果;分別研究了殺菌劑和阻垢緩蝕劑對SS316L表面SRB生物膜化學組分及腐蝕行為的影響,從生物膜特性及膜下腐蝕的角度判斷了藥劑緩蝕性能的優(yōu)劣。通過以上研究,本課題可以為熱電廠防腐防垢的藥劑選擇提供一定的理論和數(shù)據(jù)支持。研究取得了如下成果:(1)水質(zhì)分析評估表明,北方4個電廠的再生水中存在結(jié)垢問題,主要是CaCO3、BaSO4和Ca3(PO4)2等鹽類的結(jié)垢;SO42-存在超標的問題,Cl-引起較大的腐蝕傾向;有機物含量較為豐富、含氮量超標,有利于微生物的滋生。(2)電化學研究表明,當濃縮3倍循環(huán)水中Cl-濃度超過380mg/L,Cl-對SS316L鈍化膜的侵蝕作用明顯加劇,表現(xiàn)為陽極溶解電流密度顯著增加,最大達到2.11μA/cm2;當氨氮濃度超過15mg/L,氨氮對SS316L鈍化膜的侵蝕作用明顯加劇,最大陽極溶解電流密度達到1.01 μA/cm2;S042-與水中Cl-在SS316L表面存在競爭吸附,當SO42-濃度達到520mg/L時,此時[Cl-]/[SO42-]的值為0.54,濃縮3倍循環(huán)水對SS316L鈍化膜的侵蝕被有效緩解,陽極溶解電流密度最大降幅達到59.0%,但隨著浸泡時間的延長,腐蝕依舊有所加劇。(3)阻垢緩蝕劑復配研究發(fā)現(xiàn),4種阻垢緩蝕劑的阻鈣垢性能排序為:PESAPBTCAPASPHEDP,4種阻垢緩蝕劑對SS316L的緩蝕性能排序為:PBTCAPASPHEDPPESA;由于PESA與PBTCA能夠增加羧酸基、磷酸基、羥基的數(shù)量,并且改變CaCO3晶體的結(jié)垢類型,二者同時具有最佳的阻垢和緩蝕協(xié)同效應,濃度比為1:3時,阻垢率達到最大,為97.8%;濃度比為1:1時,緩蝕率達到最大,為81.2%。(4)阻垢緩蝕劑和殺菌劑對SRB生物膜組分影響研究表明,PBTCA和PESA分別使得SS316L表面EPS含量增加了 1.4%和5.8%;由于不同的殺菌機理,異噻唑啉酮、NaClO和1227對EPS含量的削減率分別達到了 62.5%、70.3%和80.6%,其中,NaClO對蛋白質(zhì)的削減能力最大,削減率為70.4%,1227對多糖的削減能力最大,削減率為84.0%,三種殺菌劑均能有效地抑制SRB及其生物膜在不銹鋼表面的粘附。(5)阻垢緩蝕劑和殺菌劑均能改變SS316L表面生物膜形貌;X射線光電子能譜結(jié)果顯示,添加NaClO后,SS316L表面-NH2的含量最低,從基團角度印證了 NaClO對蛋白質(zhì)較強的削減能力,同時,檢測到的FeCl2,表明NaClO對SS316L鈍化膜產(chǎn)生了一定的侵蝕;1227能夠大幅度改變SS316L表面膜中C:O比值,影響了以多糖為主的碳氧化合物的結(jié)構(gòu)。(6)阻垢緩蝕劑和殺菌劑對SRB生物膜下SS316L腐蝕行為影響研究表明,PBTCA能夠降低陽極溶解電流密度,而PESA可以微弱地促進微生物腐蝕;異噻唑啉酮、NaClO和1227均能有效抑制微生物腐蝕,但是,由于還原生成Cl-,NaClO急劇增大陽極溶解電流密度,降低擊穿電位,侵蝕SS316L鈍化膜;1227具有成膜性,使得擊穿電位達到最大值1.19V,有助于鈍化保護。交流阻抗圖譜(EIS)表明,PBTCA和PESA能增加生物膜厚度;3種殺菌劑均能削減生物膜厚度,降低表面膜阻抗,NaClO使得SS316L表面膜阻抗降至最低,增大腐蝕風險,而1227條件下,膜阻抗值較高。本研究最終確定了最優(yōu)復配阻垢緩蝕劑方案為PBTCA:PESA=1:1;最佳殺菌劑為1227,具有最優(yōu)的殺菌和緩蝕性能。
[Abstract]:Taking the circulating cooling water system of the thermal power plant as the research background, taking 316L stainless steel (Sainless steel 316L, SS316L) as the research medium, as the research medium, the sulfate-reducing bacteria (SRB) was used as the research medium. The water quality of four representative power plants (A, B, C, D) in the north was analyzed and evaluated by water analytical chemistry, biochemistry, electrochemical and surface analysis. The effects of Cl-, ammonia nitrogen and SO42-on the electrochemical corrosion of SS316L were studied. The effect of corrosion inhibitor on the chemical composition and corrosion behavior of SRB biofilm on SS316L surface was studied. The effect of the corrosion inhibitor and the corrosion inhibitor on the chemical composition and corrosion behavior of SS316L surface was studied. Through the above research, this project can provide some theoretical and data support for the selection of anti-fouling agent for thermal power plant. The results are as follows: (1) The water quality analysis and evaluation show that the problem of scaling in the regeneration water of the four power plants in the north is mainly the scaling of the salts such as CaCO3, BaSO4 and Ca3 (PO4) 2; the problem that the SO42-is in excess of the standard, Cl-causes a large corrosion tendency; the organic content is rich, The nitrogen content exceeds the standard, which is beneficial to the breeding of microorganisms. (2) The electrochemical study shows that when the concentration of Cl-in the 3-fold circulating water exceeds 380mg/ L, the etching effect of the Cl-to the SS316L passivation film is obviously increased, and the dissolution current density of the anode is obviously increased, and the maximum reaches 2.11. mu. A/ cm2; when the concentration of the ammonia nitrogen exceeds 15mg/ L, The effect of ammonia nitrogen on the passivation film of SS316L is obviously increased, the maximum anodic dissolution current density is 1. 01.mu. A/ cm2, S042-and Cl-in the water are competitive adsorption on the surface of SS316L, when the SO42-concentration reaches 520mg/ L, the value of[Cl-]/[SO42-] is 0.54, The effect of 3-fold concentration of circulating water on the passivation film of SS316L is effectively relieved, the maximum reduction of the current density of the anode is 59. 0%, but with the extension of the soaking time, the corrosion is still increasing. (3) The anti-scale corrosion inhibitor compound study found that the corrosion resistance of four corrosion-resistant corrosion inhibitors was ordered to be: PESAPBTCAPASPHEDP, and the corrosion resistance of four kinds of scale inhibitor to SS316L was ordered as: PBTCAPASPHEEDPPESA; because of the addition of PESA and PBTCA to increase the number of acid-based, phosphoric and hydroxyl groups, and to change the scale type of CaCO3 crystals, When the concentration ratio is 1: 3, the corrosion resistance rate reaches the maximum, which is 97.8%, the concentration ratio is 1: 1, and the corrosion rate reaches the maximum of 81.2%. (4) The effect of the corrosion inhibitor and the bactericide on the composition of the SRB biofilm shows that the EPS content of the SS316L surface is increased by 1. 4% and 5. 8%, respectively, and the reduction rate of the EPS content is 62.5%, 70.3% and 80.6%, respectively, due to different sterilization mechanisms. Among them, the reduction ability of NaClO to the protein is the most, the reduction rate is 70.4%, the reduction capacity of 1227 to the polysaccharide is the most, the reduction rate is 84.0%, and the three fungicides can effectively inhibit the adhesion of the SRB and the biofilm to the surface of the stainless steel. The results of X-ray photoelectron spectroscopy show that after addition of NaClO, the content of SS316L surface-NH2 is the lowest, and the ability of NaClO to reduce the protein is confirmed from the group angle, meanwhile, FeCl2 is detected, The results show that NaClO has a certain erosion on the SS316L passivation film, and 1227 can greatly change the C: O ratio in the surface film of SS316L. The structure of the carbon-oxygen compound with the main polysaccharide is affected. (6) The study of the effect of the corrosion inhibitor and the bactericide on the corrosion behavior of SS316L in the SRB biofilm shows that the PBTCA can reduce the current density of the anode, and the PESA can effectively promote the corrosion of the microorganism. The reduction of Cl-, NaClO dramatically increases the anodic dissolution current density, decreases the breakdown potential and erodes the SS316L passivation film; 1227 has a film-forming property so that the breakdown potential reaches a maximum value of 1.19V, which contributes to the passivation protection. The exchange impedance map (EIS) shows that PBTCA and PESA can increase the thickness of the biofilm; 3 fungicides can reduce the film thickness, reduce the surface membrane impedance, and NaClO makes the surface film impedance of the SS316L surface drop to the lowest, increasing the corrosion risk, and under the 1227 condition, the membrane impedance value is high. The optimum anti-scaling inhibitor scheme is PBTCA: PESA = 1: 1, and the optimal bactericide is 1227, which has the best bactericidal and corrosion-resistant properties.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM621
本文編號：2325347
[Abstract]:Taking the circulating cooling water system of the thermal power plant as the research background, taking 316L stainless steel (Sainless steel 316L, SS316L) as the research medium, as the research medium, the sulfate-reducing bacteria (SRB) was used as the research medium. The water quality of four representative power plants (A, B, C, D) in the north was analyzed and evaluated by water analytical chemistry, biochemistry, electrochemical and surface analysis. The effects of Cl-, ammonia nitrogen and SO42-on the electrochemical corrosion of SS316L were studied. The effect of corrosion inhibitor on the chemical composition and corrosion behavior of SRB biofilm on SS316L surface was studied. The effect of the corrosion inhibitor and the corrosion inhibitor on the chemical composition and corrosion behavior of SS316L surface was studied. Through the above research, this project can provide some theoretical and data support for the selection of anti-fouling agent for thermal power plant. The results are as follows: (1) The water quality analysis and evaluation show that the problem of scaling in the regeneration water of the four power plants in the north is mainly the scaling of the salts such as CaCO3, BaSO4 and Ca3 (PO4) 2; the problem that the SO42-is in excess of the standard, Cl-causes a large corrosion tendency; the organic content is rich, The nitrogen content exceeds the standard, which is beneficial to the breeding of microorganisms. (2) The electrochemical study shows that when the concentration of Cl-in the 3-fold circulating water exceeds 380mg/ L, the etching effect of the Cl-to the SS316L passivation film is obviously increased, and the dissolution current density of the anode is obviously increased, and the maximum reaches 2.11. mu. A/ cm2; when the concentration of the ammonia nitrogen exceeds 15mg/ L, The effect of ammonia nitrogen on the passivation film of SS316L is obviously increased, the maximum anodic dissolution current density is 1. 01.mu. A/ cm2, S042-and Cl-in the water are competitive adsorption on the surface of SS316L, when the SO42-concentration reaches 520mg/ L, the value of[Cl-]/[SO42-] is 0.54, The effect of 3-fold concentration of circulating water on the passivation film of SS316L is effectively relieved, the maximum reduction of the current density of the anode is 59. 0%, but with the extension of the soaking time, the corrosion is still increasing. (3) The anti-scale corrosion inhibitor compound study found that the corrosion resistance of four corrosion-resistant corrosion inhibitors was ordered to be: PESAPBTCAPASPHEDP, and the corrosion resistance of four kinds of scale inhibitor to SS316L was ordered as: PBTCAPASPHEEDPPESA; because of the addition of PESA and PBTCA to increase the number of acid-based, phosphoric and hydroxyl groups, and to change the scale type of CaCO3 crystals, When the concentration ratio is 1: 3, the corrosion resistance rate reaches the maximum, which is 97.8%, the concentration ratio is 1: 1, and the corrosion rate reaches the maximum of 81.2%. (4) The effect of the corrosion inhibitor and the bactericide on the composition of the SRB biofilm shows that the EPS content of the SS316L surface is increased by 1. 4% and 5. 8%, respectively, and the reduction rate of the EPS content is 62.5%, 70.3% and 80.6%, respectively, due to different sterilization mechanisms. Among them, the reduction ability of NaClO to the protein is the most, the reduction rate is 70.4%, the reduction capacity of 1227 to the polysaccharide is the most, the reduction rate is 84.0%, and the three fungicides can effectively inhibit the adhesion of the SRB and the biofilm to the surface of the stainless steel. The results of X-ray photoelectron spectroscopy show that after addition of NaClO, the content of SS316L surface-NH2 is the lowest, and the ability of NaClO to reduce the protein is confirmed from the group angle, meanwhile, FeCl2 is detected, The results show that NaClO has a certain erosion on the SS316L passivation film, and 1227 can greatly change the C: O ratio in the surface film of SS316L. The structure of the carbon-oxygen compound with the main polysaccharide is affected. (6) The study of the effect of the corrosion inhibitor and the bactericide on the corrosion behavior of SS316L in the SRB biofilm shows that the PBTCA can reduce the current density of the anode, and the PESA can effectively promote the corrosion of the microorganism. The reduction of Cl-, NaClO dramatically increases the anodic dissolution current density, decreases the breakdown potential and erodes the SS316L passivation film; 1227 has a film-forming property so that the breakdown potential reaches a maximum value of 1.19V, which contributes to the passivation protection. The exchange impedance map (EIS) shows that PBTCA and PESA can increase the thickness of the biofilm; 3 fungicides can reduce the film thickness, reduce the surface membrane impedance, and NaClO makes the surface film impedance of the SS316L surface drop to the lowest, increasing the corrosion risk, and under the 1227 condition, the membrane impedance value is high. The optimum anti-scaling inhibitor scheme is PBTCA: PESA = 1: 1, and the optimal bactericide is 1227, which has the best bactericidal and corrosion-resistant properties.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM621
【參考文獻】
相關期刊論文 前10條
1 李巖;;雙季銨鹽類緩蝕劑緩蝕機理及緩蝕性能[J];清洗世界;2015年09期
2 劉田;趙曉非;張曉陽;;旋轉(zhuǎn)掛片法研究PBTCA在不同鋼質(zhì)下的防垢緩蝕性能[J];化學工程師;2015年05期
3 朱志平;李茂東;金鵬;袁漢濤;鄒志超;黃先軍;;工業(yè)鍋爐爐水中HEDP緩蝕特性研究[J];工業(yè)水處理;2014年10期
4 王大勇;朱米家;潘科;王愛軍;羅春林;;綠色阻垢緩蝕劑的改性研究及應用進展[J];給水排水;2014年S1期
5 李龍杰;周剛;施慶珊;陳藝彩;陳儀本;歐陽友生;胡文鋒;;一株工業(yè)腐敗物中魏氏檸檬酸桿菌的分離鑒定及產(chǎn)生物膜特性分析[J];微生物學通報;2014年01期
6 高建富;李進;敬超文;;不同殺菌劑對硫酸鹽還原菌殺菌能力評價[J];工業(yè)用水與廢水;2013年06期
7 曾彬;李茂東;朱志平;張輝;趙軍明;楊波;;HEDP的熱分解特性及其阻垢性能評價[J];工業(yè)水處理;2013年06期
8 盧日時;李剛;;316、317不銹鋼耐氯離子腐蝕能力淺析[J];機械工程師;2013年06期
9 高建富;李進;敬朝文;吳芳芳;;循環(huán)冷卻水中硫酸鹽還原菌對不銹鋼腐蝕行為影響[J];華北電力技術;2013年04期
10 袁冬琴;王毅力;;活性污泥胞外聚合物(EPS)的分層組分及其理化性質(zhì)的變化特征研究[J];環(huán)境科學;2012年10期
相關博士學位論文 前1條
1 盧玉琢;鐵錳氧化菌及硫酸鹽還原菌在典型水環(huán)境中對金屬腐蝕的影響研究[D];天津大學;2011年
相關碩士學位論文 前2條
1 夏璐;循環(huán)冷卻水水質(zhì)與殺菌劑應用于生物粘泥控制的相關性研究[D];中國石油大學;2011年
2 梅瓊;水體中生物膜的生長特性及其對微囊藻毒素的吸附與降解研究[D];中國科學院研究生院（水生生物研究所）;2007年
，本文編號：2325347
本文鏈接：http://sikaile.net/kejilunwen/dianlidianqilunwen/2325347.html
最近更新
教材專著
