共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
针对某企业原料预热器12CrMo钢预热管在服役过程中出现的腐蚀失效现象,采用光学显微镜、扫描电子显微镜(SEM)、能量色散谱(EDS)对12CrMo钢管基体低倍组织观察、显微组织观察和晶粒度评级,分析了钢管表面腐蚀产物层显微组织及成分,结合腐蚀穿孔预热管表面形貌和前沿腐蚀产物成分分析,指出管程原料气侧H_2S提供了腐蚀性气氛,与12CrMo合金管内壁发生硫化腐蚀是导致原料预热器预热管腐蚀的主要原因。采取了有效的脱硫措施,采用耐腐蚀材料制作预热器管,并在原料气进预热器前进行除尘,解决了预热器穿孔的问题。 相似文献
6.
一、概况大雁矿务局有列车电站四座,装机容量为2500千瓦的机组两台、4000千瓦一台、6000千瓦一台。此外还有一座装机容量为3000千瓦的小型自备电厂,有四台中压锅炉和两台低压锅炉。多年来,因循环水水质未进行任何预处理,使得汽轮机的凝汽器结垢严重,导致凝结水温升高,汽轮机真空恶化,经常被迫停机,影响了经济效益。采用机械方法对凝汽器铜管内壁进行清垢处理,既费时、费力又不彻底,铜管内壁往往遭到不同程度的破坏。铜管内壁保护膜的破坏及冷却水质的不良,又引起了凝汽器内铜管的腐蚀,甚至造成穿孔泄漏。结果使凝结水品质 相似文献
7.
8.
9.
10.
11.
12.
13.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
14.
15.
我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
16.
Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
17.
The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
18.
19.
A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献
20.