【正文】 ................................... 3 工藝流程設計原則 ............................................................................................. 5 主要工藝設備選型 ...................................................................................................... 5 管道內徑計算 .................................................................................................... 5 管道壁厚計算 .................................................................................................... 6 閥門選型 ........................................................................................................... 7 原 動機選型 ......................................................................................................10 機組備用方式 ...................................................................................................10 匯管選型 ..........................................................................................................10 流量計選型 ...................................................................................................... 11 分離器選型 ......................................................................................................13 站場控制保障系統(tǒng) .....................................................................................................14 概述 .................................................................................................................14 主要功能 ..........................................................................................................14 壓氣站自動化控制 .....................................................................................................14 站控天然氣計量 .........................................................................................................15 站控儀表 ...................................................................................................................15 通信控制 ...................................................................................................................16 站場防腐 ...................................................................................................................16 水電供應 .................................................................................................................17 供電 ...............................................................................................................17 供水 ...............................................................................................................17 電防護與消防 ...........................................................................................................17 3 計算書 ................................................................................................................................19 天然氣基本參數(shù)確定 ..................................................................................................19 天然氣的分子量 ...............................................................................................19 天然氣相的對密度 ............................................................................................20 天然氣的壓縮系數(shù) Z.........................................................................................20 天然氣在操作條件下的密度 ..............................................................................20 天然氣在操作條件下的粘度 ..............................................................................21 分離器的尺寸設計 ......................................................................................................22 濾芯個數(shù)和分離器臺數(shù) .....................................................................................22 分離器進出口直徑及壁厚計算公式 ...................................................................23 氣體通過絲網最大允許速度 ..............................................................................24 通過絲網除霧器的面積計算其直徑 ...................................................................25 計算結果 ..........................................................................................................25 調節(jié)閥 .......................................................................................................................25 調節(jié)閥實測流通能力計算 .................................................................................25 計算結果及選型 ...............................................................................................26 站內管線計算 ............................................................................................................26 管徑和管道壁厚計算公式 .................................................................................26 速度校核公式 ...................................................................................................27 計算過程、校核及結果 .....................................................................................27 流量計的計算 ............................................................................................................28 已知參數(shù) ..........................................................................................................28 標準參比的體積流量公式 .................................................................................29 流量計算中主要參數(shù)的確定 ..............................................................................29 輔助計算 ..........................................................................................................31 孔板開孔直徑計算 ............................................................................................32 流量計選型 ......................................................................................................33 安全閥的計算 ............................................................................................................33 安全泄放量 ......................................................................................................33 安全閥的泄放壓力 ............................................................................................34 安全閥通道截面積公式 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