燃?xì)夤艿栏g分級(jí)評(píng)價(jià)理論研究
發(fā)布時(shí)間：2018-06-30 08:04
本文選題：燃?xì)夤艿?/strong> + 分級(jí)評(píng)價(jià)��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文
【摘要】：地下燃?xì)夤艿琅c供水、排水管道等共同構(gòu)成城市地下公共管網(wǎng)系統(tǒng),為城市輸送清潔能源。燃?xì)夤艿酪坏└g失效,必然導(dǎo)致燃?xì)庑孤?泄漏的天然氣在一定條件下會(huì)引發(fā)火災(zāi)、爆炸等危險(xiǎn)事故,造成人員、財(cái)產(chǎn)損失。管道失效產(chǎn)生的停運(yùn)和事故后修復(fù)也會(huì)影響人民正常生活。為了保證燃?xì)夤艿滥軌虬踩\(yùn)營(yíng),系統(tǒng)可靠的燃?xì)夤艿涝u(píng)價(jià)體系尤為重要。本文開(kāi)展的工作和取得的成果主要有:(1)建立了燃?xì)夤艿栏g程度分級(jí)模型。將影響燃?xì)夤艿栏g的因素分為五個(gè)一級(jí)指標(biāo)和七個(gè)二級(jí)指標(biāo),采用改進(jìn)綜合層次分析法,輸入因素監(jiān)測(cè)等級(jí)和因素權(quán)重,計(jì)算出管道腐蝕程度等級(jí),結(jié)果更符合管道實(shí)際情況。(2)建立了燃?xì)夤艿栏g事故嚴(yán)重性分級(jí)模型。輸入管道腐蝕失效孔尺寸及管道直徑、內(nèi)壓等參數(shù),計(jì)算火球、噴射火、云爆炸的損失半徑,根據(jù)人口密度和財(cái)產(chǎn)密度計(jì)算損失后果。結(jié)果表明:當(dāng)燃?xì)夤艿纼H有一處泄漏時(shí),云爆炸和火球的事故后果明顯大于噴射火事故,管道內(nèi)壓顯著影響事故等級(jí)。(3)建立了燃?xì)夤艿栏g事故連鎖效應(yīng)模型�？筛鶕�(jù)腐蝕源管道直徑、目標(biāo)管道直徑和管道間距數(shù)據(jù),計(jì)算連鎖效應(yīng)概率。通過(guò)算例分析了管徑比和管道凈距對(duì)連鎖效應(yīng)的影響。結(jié)果表明:連鎖效應(yīng)的概率隨著兩管道距離的增加而減小,當(dāng)管道凈距大于4倍半徑和時(shí),連鎖效應(yīng)明顯變小;源管道半徑小于目標(biāo)管道半徑時(shí),連鎖效應(yīng)更明顯。(4)對(duì)比了多種腐蝕后管道安全壓力計(jì)算方法在不同腐蝕長(zhǎng)度、腐蝕深度及管材鋼級(jí)下的差異,結(jié)果表明DNV-RP-F101有效應(yīng)力法更穩(wěn)定。(5)編制了燃?xì)夤艿栏g分級(jí)評(píng)價(jià)軟件。以燃?xì)夤艿涝u(píng)價(jià)理論為核心進(jìn)行了軟件的編輯和開(kāi)發(fā),為燃?xì)夤艿栏g分級(jí)評(píng)價(jià)提供了高效實(shí)用的評(píng)價(jià)工具。
[Abstract]:Underground gas pipeline, water supply, drainage pipe and so on constitute the urban underground public pipe network system, conveying clean energy for the city. Once the gas pipeline corrodes and fails, it will inevitably lead to gas leakage. Under certain conditions, the leaked natural gas will lead to fire, explosion and other dangerous accidents, resulting in loss of personnel and property. Failure of pipelines and post-accident repair will also affect the normal life of the people. In order to ensure the safe operation of gas pipeline, a reliable evaluation system of gas pipeline is very important. The main achievements of this paper are as follows: (1) the classification model of corrosion degree of gas pipeline is established. The factors affecting corrosion of gas pipeline are divided into five first class indexes and seven second grade indexes. The corrosion degree of pipeline is calculated by using improved comprehensive analytic hierarchy process (AHP), input factor monitoring grade and factor weight. The results are more in line with the actual situation of pipeline. (2) the severity classification model of gas pipeline corrosion accident is established. The size of corrosion failure hole and pipe diameter and internal pressure are input to calculate the loss radius of fireball, jet fire and cloud explosion, and the loss consequence is calculated according to population density and property density. The results show that when there is only one leakage in the gas pipeline, the consequences of cloud explosion and fireball accidents are obviously greater than those of jet fire accidents, and the internal pressure of the pipeline significantly affects the accident grade. (3) the cascading effect model of gas pipeline corrosion accidents is established. The probability of cascading effect can be calculated according to the diameter of corrosion source pipe, the diameter of target pipe and the distance between pipes. The influence of diameter ratio and net distance of pipe on the linkage effect is analyzed by an example. The results show that the probability of the linkage effect decreases with the increase of the distance between the two pipelines. When the net distance of the pipeline is greater than 4 times the radius of the pipeline, the linkage effect becomes smaller, and the radius of the source pipeline is smaller than the radius of the target pipeline. The linkage effect is more obvious. (4) the difference of different calculation methods of pipeline safety pressure under different corrosion length, corrosion depth and pipe steel grade after corrosion is compared. The results show that the effective stress method of DNV-RP-F101 is more stable. (5) the evaluation software for corrosion grading of gas pipeline is developed. Based on the theory of gas pipeline evaluation, the software is edited and developed, which provides an efficient and practical evaluation tool for gas pipeline corrosion grading evaluation.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU996
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本文編號(hào)：2085592
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