【正文】 41 節(jié)點(diǎn)水力可靠度 37 本章小結(jié) 27 II 計(jì)算實(shí)例 27 常用水力計(jì)算軟件介紹 26 解環(huán)方程法計(jì)算步驟 25 分區(qū)管網(wǎng)水力特點(diǎn) 25 分區(qū)管網(wǎng)水力計(jì)算特點(diǎn)及求解步驟 23 水力計(jì)算狀態(tài)方程的選擇 23 水力計(jì)算管內(nèi)流動(dòng)的基本方程 21 燃?xì)夤芫W(wǎng) 水力計(jì)算 21 城市燃?xì)夤芫W(wǎng)分區(qū)原則 19 第 3 章 城市燃?xì)夤芫W(wǎng)分區(qū)模式水力計(jì)算及工況分析 17 增長率法預(yù)測 16 管網(wǎng)計(jì)算流量的確定 13 各類用戶用氣量的確定 13 用氣指標(biāo)法 5 管網(wǎng)分區(qū)模式目前研究的不足 2 城市燃?xì)夤芫W(wǎng) 分區(qū)模式 國內(nèi)外研究 現(xiàn)狀 1 研究的 必要性和意義 1 研究背景 Reliability I 目 錄 第 1 章 緒論 Hydraulic Calculation。 關(guān)鍵詞： 燃?xì)夤芫W(wǎng) ； 分區(qū)模式 ； 水力計(jì)算 ； 事故工況 ； 可靠性 Abstract With the increasing use of natural gas, city gas pipeline work bees larger and more plex. In order to ensure the reasonable and reliable gas work design, operation, and effectively deal with different accidents, it’s inevitable to understand the gas work operation law. Since the problems of largescale centralized pipeline work, such as, low pressure points concentrate in the middle of the pipeline work, gate stations and regulator stations’ division of labor are not clear, diffusion area is too large, design and running of pipelines cannot effectively bine, are caused by the work structure that are unable to be solved by optimization calculation and design of gas pipeline work. An adequate way to solve these problems is to put forward a new work structure, therefore, in this paper, we introduce a partition model of gas pipeline work, hoping to propose some new ideas of gas pipeline work model. The main contents of this paper are as follows: 1. We expound the detailed process of index method to predict gas consumption, and apply this method to one southwest city, then pare the results with the gas consumption predictions of this city by growth rate predicting method and economic forecasting method. It shows that index method is an effective gas consumption prediction method. 2. In this part, the authors propose the conditions when to use partition model and the partition method. Partition model is available in a centralized pipe work, or a high (subhigh) –medium pressure two level pipeline work, or a system with two and above high (subhigh) medium pressure regional regulator stations. The regional regulator station will be center of each independent system when partitioned, and to ensure the accident condition, the pipeline work cannot be pletely cut off, all regions are connected by pipes which have installed isolation valves. These valves are closed under normal conditions and open when accidents happened. 3. We will present the hydraulic calculation method of the partition pipeline work model, and introduce the principle and calculation steps of the ring equation. 4. Based on the node reliability, pipe hydraulic reliability and weighted sum of gas pipeline work’s topology structure， we choose the systematic work structural reliability analysis method to research the reliability of pipeline work system. In this section, we also introduce the conception of reliability management of gas pipeline work, and make an investigation about it throughout the different stages of pipeline work’s life cycle. 5. Here we take the gas pipeline work of one southwest city as an example. We apply both ring work and partition modes on it. A detailed parison of these two modes is conducted through hydraulic calculation, accident analysis, reliability calculation, and the number of valves. And we conclude that the partition mode is indeed feasible. Keywords: Gas Network。 提出了管網(wǎng)分區(qū)模式提高可靠性的措施。 4) 基于節(jié)點(diǎn)的可靠性、管段水力可靠性和燃?xì)夤芫W(wǎng)拓?fù)浣Y(jié)構(gòu)的加權(quán)和，采用系統(tǒng)網(wǎng)絡(luò)結(jié)構(gòu)可靠性分析方法，進(jìn)行管網(wǎng)的系統(tǒng)可靠度研究。分區(qū)模式 適用于集中型管網(wǎng)、壓力級(jí)制為高 （ 次高 ） 壓 中壓二級(jí)管網(wǎng) 、有 2 個(gè)及以上高 （ 次高 ） 壓 中壓區(qū)域調(diào)壓站，分區(qū)時(shí)以各區(qū)域調(diào)壓站為中心 各成 獨(dú)立系統(tǒng) ， 并且 為保證事故工況，管網(wǎng)不能完全隔 斷，各區(qū)域之間用管道連通，連通管上安裝隔離閥，正常工況下隔離閥關(guān)閉，事故時(shí)打開。本文研究的主要內(nèi)容如下： 1) 闡述了指標(biāo)法預(yù)測燃?xì)庥昧康脑敿?xì)過程，以西南某市燃?xì)夤芫W(wǎng)為例，進(jìn)行了燃?xì)庥昧康挠?jì)算， 同時(shí)采用 增長率 預(yù)測法和 經(jīng)濟(jì) 預(yù)測法對(duì)該市 燃?xì)?用量進(jìn)行預(yù)測，經(jīng)比較認(rèn)為 指標(biāo)法指標(biāo)選取合理 ， 統(tǒng)計(jì)分析科學(xué) ，是適合的燃?xì)庥昧款A(yù)測方法。這些問題是由管網(wǎng)結(jié)構(gòu)造成的，是不能通過管網(wǎng)的優(yōu)化計(jì)算、可靠性設(shè)計(jì)所能夠改善的，只有采用新的管網(wǎng)結(jié)構(gòu)才有可能解決這些問題。 碩 士 學(xué) 位 論 文 城市燃?xì)廨斉涔芫W(wǎng)分區(qū)模式 下 的 水力可靠性 研究 摘 要 隨著天然氣使用規(guī)模的不斷擴(kuò)大，城鎮(zhèn)燃?xì)夤芫W(wǎng)越來越龐大和復(fù)雜，了解和掌握燃?xì)夤芫W(wǎng)的運(yùn)行規(guī)律，才能保證燃?xì)夤芫W(wǎng)合理可靠的設(shè)計(jì)、運(yùn)行，以及有效的應(yīng)對(duì)事故工況。 大型集中型管網(wǎng)存在低壓點(diǎn)集中在管網(wǎng)中部、門站及各調(diào)壓站供氣范圍不明確、停氣放散面積大、 設(shè)計(jì)與運(yùn)行管理不能有效結(jié)合 等問題。因此本文提出了燃?xì)夤芫W(wǎng)分區(qū) 模式，希望能對(duì)燃?xì)夤芫W(wǎng)模式提出新的思路。 2) 提出了燃?xì)夤芫W(wǎng)采用分區(qū)模式的條件 及分 區(qū) 方法。 3) 闡述了分區(qū)管網(wǎng)模式的水力計(jì)算方法 ，詳細(xì)介紹了解環(huán)方程法的原理和計(jì)算步驟。介紹了燃?xì)夤芫W(wǎng)可靠性管理的概念，對(duì)管網(wǎng)全生命周期的各階段可靠性管理內(nèi)容進(jìn)行了探究。 5) 以西南某市燃?xì)夤芫W(wǎng)為例，對(duì)其進(jìn)行了 環(huán)網(wǎng)和分區(qū)兩 種模式 的水力計(jì)算、事故工況分析、可靠度計(jì)算、閥門數(shù)量比 較等工作，從各方面對(duì) 兩 種模式 進(jìn)行了比較，得出 了分區(qū) 模式 的可行性結(jié)論。 Partition Model。 Accident Condition。 5 國 內(nèi) 外 管網(wǎng)分區(qū)模式研究現(xiàn)狀 9