【摘要】：本課題針對1PE裝置使用超二十年的壓力容器開展評估工作。整個工作包括了對1PE裝置設(shè)備的數(shù)據(jù)收集分析、現(xiàn)場檢測和RBI評估。 通過對歷年的檢測數(shù)據(jù)分析,了解了89臺壓力容器在運(yùn)行了20-30年后內(nèi)外壁的腐蝕情況,并以此計算了壓力容器的腐蝕速率。部分壓力容器在服役期間也進(jìn)行了結(jié)構(gòu)改造,比如夾套結(jié)構(gòu),換熱器的密封結(jié)構(gòu)等等。 根據(jù)塑料事業(yè)部所提供的資料對裝置的工藝與腐蝕情況進(jìn)行的了解、API 581所提供的資料與數(shù)據(jù)、參考同類裝置的失效分析資料并聽取材料與腐蝕專家的意見,經(jīng)綜合分析后確定1PE裝置中引起設(shè)備失效的主要損傷機(jī)理包括內(nèi)部腐蝕減薄、外部損傷(大氣腐蝕和保溫層下腐蝕)。 本文采用API 581方法,對1PE裝置的壓力容器進(jìn)行風(fēng)險評估,確定每設(shè)備風(fēng)險的可能性因素和潛在后果,并確定每臺設(shè)備的風(fēng)險等級。以此提出設(shè)備檢驗(yàn)建議,由廠方安排設(shè)備檢驗(yàn)。本研究對4臺超高壓容器和22臺高壓容器根據(jù)當(dāng)前設(shè)備壁厚進(jìn)行強(qiáng)度校核,并對最小壁厚進(jìn)行計算,確保這些高壓容器在延長的服役期間能安全運(yùn)行。 由于1PE裝置內(nèi)儲存的介質(zhì)純度很高,主要是乙烯,腐蝕性雜質(zhì)含量不高,平均腐蝕速率較低,設(shè)備選材合理,因而介質(zhì)腐蝕損傷機(jī)理情況基本不考慮。89臺壓力容器中換熱器由于存在冷卻水或高溫蒸汽,易發(fā)生腐蝕,因此要加強(qiáng)監(jiān)測或更換不銹鋼材質(zhì)。由于裝置超期服役多年,裝置的失效可能性等級逐年增加,且風(fēng)險分布范圍比較大,應(yīng)當(dāng)加大檢測力度。
[Abstract]:This paper aims at the evaluation of pressure vessel which has been used for more than 20 years in 1PE plant. The whole work includes data collection and analysis, field inspection and RBI evaluation of 1PE equipment. The corrosion of 89 pressure vessels in the inner and outer walls after 20 years of operation has been studied by analyzing the inspection data in the past years, and the corrosion rate of the pressure vessels has been calculated. Some pressure vessels have been modified during service, such as jacket structure, sealing structure of heat exchanger and so on. Based on the information provided by the Plastics Department to understand the process and corrosion of the plant, the information and data provided by API 581, referring to the failure analysis data of similar devices, and listening to the advice of materials and corrosion experts, After comprehensive analysis, it is determined that the main damage mechanisms of 1PE equipment failure include internal corrosion thinning, external damage (atmospheric corrosion and under-insulation corrosion). In this paper, the API 581 method is used to evaluate the risk of the pressure vessel of the 1PE plant, to determine the possible factors and potential consequences of each equipment risk, and to determine the risk level of each equipment. Based on this, the equipment inspection suggestion is put forward, and the factory arranges the equipment inspection. In this study, the strength of 4 ultra-high pressure vessels and 22 high-pressure vessels were checked according to the wall thickness of the current equipment, and the minimum wall thickness was calculated to ensure the safe operation of these high-pressure vessels during extended service. Due to the high purity of the medium stored in the 1PE plant, mainly ethylene, low corrosive impurity content, low average corrosion rate and reasonable material selection of the equipment, In 89 pressure vessels, the heat exchangers are prone to corrosion due to the presence of cooling water or high temperature steam, so it is necessary to strengthen the monitoring or replacement of stainless steel materials. Since the equipment is out of service for many years, the possibility of failure of the device increases year by year, and the risk distribution range is relatively large, so the strength of detection should be increased.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH49

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