化工泵轴端密封研究

发布时间：2018-04-08 16:19

本文选题：化工泵　切入点：密封　出处：《西安石油大学》2015年硕士论文

【摘要】：塔里木化肥装置现有32台高危介质泵,主要输送液氨、氨水、尿液等有毒介质,其主要特点是:输送的介质都为有毒有害介质,部分介质容易汽化或结晶;对密封的要求较高,出现介质泄漏容易引起环境污染和人员伤害,又有可能引起火灾爆炸等恶性事故,同时装置的连续运行对泵的可靠性要求也高,需要设备长周期连续运行,从经济效益角度也需要机泵开展预知性维修,降低故障检修的频次以减低检修维护费用。现有机泵的机械密封使用寿命短、故障率高,动静环易碎裂、“O”圈易老化。论文分析了装置所用机械密封的主要故障现象及其产生的原因,研究了泵的实际运行工况特征,论证并依据API682标准提出了高危介质泵机械密封的设计要求和新的改造设计方案,完成了相关设计计算和技术设计。依据高危介质泵所输送介质的特点、密封腔体新设计全部采用双端面密封,引入API682标准中的PLAN01、11、13、14以及53B等辅助系统方案,“O”型圈全部采用杜邦全氟醚材质,弹簧采用哈C-276材质、补偿环和非补偿环分别采用进口石墨和碳化硅材质,辅助系统中的隔离液采用MOBIL DTE 732轻质润滑油,改造后效果明显,机械使用寿命从最初的4000小时延长至近20000小时,大大提高了高危介质泵保障生产的能力,大幅下降了检维修次数、备件的消耗数量,避免了有毒介质泄漏带来的巨大安全风险和隐患,经济效益可观、明显。
[Abstract]:The Tarim chemical fertilizer plant has 32 sets of high risk medium pumps, which mainly transport toxic media such as liquid ammonia, ammonia water, urine and so on. The main characteristics of these pumps are that the media transported are all toxic and harmful media, some of which are easy to vaporize or crystallize, and the requirements for sealing are high.The leakage of medium can easily cause environmental pollution and human injury, and it may also lead to serious accidents, such as fire and explosion. At the same time, the continuous operation of the device also requires high reliability of the pump, which requires the equipment to run continuously for a long period.From the point of view of economic benefit, it is necessary to carry out predictive maintenance and reduce the frequency of troubleshooting in order to reduce the maintenance cost.The mechanical seal of the existing machine pump has short service life, high failure rate, easy breakup of the dynamic and static rings, and easy aging of the "O" ring.This paper analyzes the main failure phenomena and causes of mechanical seal used in the device, studies the characteristics of the actual operating conditions of the pump, demonstrates and puts forward the design requirements of the mechanical seal of the high risk medium pump according to the API682 standard and the new design scheme of the revamping.Completed the related design calculation and technical design.According to the characteristics of the medium transported by the high risk medium pump, the new design of the sealing chamber adopts the double face seal, and the auxiliary system schemes such as PLAN01C11131314 and 53B are introduced in the API682 standard. The "O" ring is made of DuPont perfluoroether, all of which are made of DuPont perfluoroether.The spring is made of Ha-C-276, the compensation ring and the non-compensation ring are made of imported graphite and silicon carbide, respectively, and the isolating fluid of the auxiliary system is made of MOBIL DTE 732 light lubricating oil. The effect of the modification is obvious.The service life of the machinery has been extended from the initial 4000 hours to nearly 20000 hours, which has greatly improved the production capacity of the high risk medium pumps, greatly reduced the inspection and maintenance times, and the consumption of spare parts.The safety risk and hidden danger caused by toxic medium leakage are avoided, and the economic benefit is considerable and obvious.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH136

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