基于热电厂循环冷却用水的中水缓蚀阻垢优化研究

发布时间：2018-05-14 22:05

本文选题：中水 + 循环冷却水　；参考：《西南交通大学》2017年硕士论文

【摘要】：当今社会发展迅速随着水资源需求量的不断上升和淡水资源的短缺以及水资源环境受污染状况日益严峻,水资源短缺已经成为制约了的人类经济发展,威胁人类生存安全的一个严重问题。由于城市中水来源的稳定性和低廉性,城市中水作为第二水资源加以开发利用就显得尤为重要,成为缓解水资源紧缺的一个重要途径。在热电厂耗水中,循环冷却水占总水量的90%以上,装机容量2×330MW的热电厂,每天循环冷却水的补水量达2500t左右,消耗量很是巨大。因此,将城市中水回用作电厂循环冷却水可以节约珍贵的水资源,实现再生水的循环利用,有利于国民经济和生态环境的和谐可持续发展。由于中水回用到循环冷却水中会不断地蒸发浓缩使水中各离子浓度含量不断上升,当到一定浓缩倍率时便会影响到电力系统冷凝设备的腐蚀、结垢以及微生物孳生繁殖问题,妨碍循环冷却水浓缩倍率的提高,危害热电厂发电机组的安全运行。因此,热电厂循环冷却水必须经过一定程度缓蚀阻垢的处理,从而一方面确保循环冷却水浓缩倍数的提高,另一方面保证系统发电机组的正常安全运行。本文针对沈阳某热电厂循环冷却水中会不断地蒸发浓缩使水中Ca2+浓度含量不断上升,当浓缩倍率提高到一定阈值,便会影响到电力系统冷凝设备的腐蚀、结垢问题以及热电厂现用JY-715型处理剂价格高,处理效果不佳等问题进行缓蚀阻垢剂的复合配方优化。对取自沈阳西郊污水处理厂的二级处理水作为电厂循环冷却水系统的补充水作为试验用水。分别进行阻垢剂、缓蚀剂单一药剂优选试验和复合配方浓度参数优化试验,统计试验数据并观察、分析试验结果,再进行成本经济性分析。从而得到适合沈阳某热电厂循环冷却水缓蚀阻垢优化复合配方。通过对优选出的缓蚀剂、阻垢剂的品种和适宜浓度的结果再进行缓蚀阻垢剂的复合配方优化,对其二元、三元复配的协同增效作用及拮抗减效作用进行探究分析。然后以此对五种缓蚀阻垢药剂进行正交试验分析,确定复合配方甲(PASP:PBTCA:HEDP:水溶性咪唑啉:EDTMPS 为 17:20:23:17:16mg/L)和复合配方乙(PASP:PBTCA:HEDP:水溶性咪唑啉:EDTMPS为20:20:28:17:16mg/L)为试验较优配方,其对应的阻垢率和缓蚀率分别是97.9%、97.9%和96.7%、98.9%。对优化后的复配药剂进行成本经济性分析。复合配方甲(PASP:PBTCA:HEDP:水溶性咪唑啉:EDTMPS为17:20:23:17:16mg/L)处理成本为1.712元/m3,复合配方乙(PASP:PBTCA:HEDP:水溶性咪唑啉:EDTMPS 为 20:20:28:17:16mg/L)处理成本为1.873元/m3,沈阳某热电厂现在所用JY-715型水处理剂单价约为2.5元/m3。比较可知,采用复合配方甲(PASP:PBTCA:HEDP:水溶性咪唑啉:EDTMPS为17:20:23:17:16mg/L)每年可节省约 680832 元。将实验室配制的复合配方甲(PASP:PBTCA:HEDP:水溶性咪唑啉:EDTMPS为17:20:23:17:16mg/L)与JY-715型缓蚀阻垢剂性能的现场验证。JY-715型缓蚀阻垢剂的平均缓蚀率为90.9%,阻垢率为84.8%;而复合配方甲的平均缓蚀率达98.1%,阻垢率达97.8%。综合比较,复合配方甲使用成本较低,缓蚀阻垢性能上表现出优质高效性,完全能够保证沈阳某热电厂循环冷却水系统冷凝器、发电机组的稳定、安全运行;在经济效益上也表现出一定的优越性。
[Abstract]:With the increasing demand of water resources, the shortage of fresh water resources and the increasingly severe pollution of water resources and environment, the shortage of water resources has become a serious problem that restricts human economic development and threatens the safety of human survival. The development and utilization of water as second water resources is particularly important. It has become an important way to alleviate the shortage of water resources. In the water consumption of the thermal power plant, the circulating cooling water accounts for more than 90% of the total water and the installed capacity of the thermal power plant with a capacity of 2 * 330MW. The amount of replenishment of the circulating cooling water is about 2500t, and the consumption is very huge. Therefore, the city is in the middle of the city. The reuse of water as the circulating cooling water of the power plant can save precious water resources and realize the recycling of reclaimed water, which is beneficial to the harmonious and sustainable development of the national economy and the ecological environment. As the water recycling in the circulating cooling water will continuously evaporate and concentrate, the concentration of each ion in the water will rise continuously, and when the concentration ratio is to a certain concentration ratio, it will be reflected. The corrosion of the condensing equipment of the power system, the scaling and the breeding of the microorganism, hinders the increase of the concentration ratio of the circulating cooling water and endangers the safe operation of the thermoelectric power plant. Therefore, the circulating cooling water of the thermal power plant must be treated with a certain degree of corrosion and scale inhibition, thus ensuring the extraction of the concentration multiple of the circulating cooling water on the one hand. On the other hand, the normal and safe operation of the system generator set is guaranteed. This paper aims at the continuous evaporation and concentration of the circulating cooling water in a thermal power plant in Shenyang to increase the concentration of Ca2+ in the water continuously. When the concentration ratio is raised to a certain threshold, it will affect the corrosion of the condensing equipment in the power system, the problem of scaling and the current use of JY-715 in the thermal power plant. The compound formula of corrosion inhibitor is optimized with high price and poor treatment effect. The two grade water from the sewage treatment plant of the western suburb of Shenyang is used as the supplementary water of the circulating cooling water system of the power plant as the test water. Test, statistical test data and observation, analysis of the results of the test, and then the cost economy analysis. Thus the optimum compound formula for corrosion and scale inhibition of circulating cooling water in a thermal power plant in Shenyang is obtained. The compound formula of the corrosion inhibitor is optimized by the optimized corrosion inhibitor, the scale of the scale inhibitor and the suitable concentration. The synergistic synergism and antagonistic effect of the three element compound were investigated and analyzed. Then, the orthogonal test was carried out to determine the compound formula a (PASP:PBTCA:HEDP: water-soluble imidazoline: EDTMPS 17:20:23:17:16mg/L) and compound formula B (PASP:PBTCA:HEDP: water soluble imidazoline: EDTMPS as 20:20:28:17: 16mg/L) for the optimum formula, the corresponding scale and corrosion inhibition rate were 97.9%, 97.9% and 96.7% respectively. 98.9%. was used to analyze the cost economy of the optimized reagents. The compound formula a (PASP:PBTCA:HEDP: water-soluble imidazoline: EDTMPS 17:20:23:17:16mg/L) was treated as 1.712 yuan /m3, and the compound formula B (PASP:PBTCA:HEDP: water solubility) Imidazoline: EDTMPS 20:20:28:17:16mg/L) treatment cost of 1.873 yuan /m3, Shenyang a thermoelectric plant now use JY-715 type water treatment agent for a single price of about 2.5 yuan /m3. compared to the use of compound formula a (PASP:PBTCA:HEDP: water-soluble imidazoline: EDTMPS 17:20:23:17:16mg/L) can save about 680832 yuan per year. The performance of Fang Jia (PASP:PBTCA:HEDP: water-soluble imidazoline: EDTMPS 17:20:23:17:16mg/L) and JY-715 type corrosion inhibitor was verified by the average corrosion inhibition rate of 90.9% and the scale inhibition rate of 84.8%, while the average corrosion inhibition rate of the compound formula a was 98.1%, the scale inhibition rate was 97.8%. comprehensive comparison, and the compound formula a was lower in use cost. The performance of corrosion and scale inhibition shows high quality and efficiency, and it can completely guarantee the condenser of the circulating cooling water system of a thermal power plant in Shenyang, the stable and safe operation of the generator set, and also shows some advantages in the economic benefit.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703;TM621

【参考文献】