【正文】
及過(guò)熱器溫度的分析,以 PLC 為控制器、采用 PID 算法、運(yùn)用 STEP7— Micro/WIN 進(jìn)行梯形圖編程,分別設(shè)計(jì) 了爐膛溫度串級(jí)控制方案、流量比值控制方案,爐壓前饋 — 反饋 控制方案,汽包水位三沖量控制方案和過(guò)熱器串級(jí)控制方案,實(shí)現(xiàn)了對(duì)各個(gè)控制系統(tǒng)的 自動(dòng)控制。 作者簽名 : 二〇 一 〇年 九 月 二十 日 畢業(yè)設(shè)計(jì)(論文)使用授權(quán)聲明 本人完全了解 濱州學(xué)院 關(guān)于收集、保存、使用畢業(yè)設(shè)計(jì)(論文)的規(guī)定。內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書(shū)(畢業(yè)論文) 內(nèi)蒙古科技大學(xué) 本科生畢業(yè)設(shè)計(jì)說(shuō)明書(shū)(畢業(yè)論文) 題 目: 基于 PLC的火電廠 鍋爐控制 系統(tǒng) 設(shè)計(jì) 內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書(shū)(畢業(yè)論文) II 獨(dú) 創(chuàng) 聲 明 本人鄭重聲明:所呈交的畢業(yè)設(shè)計(jì) (論文 ),是本人在指導(dǎo)老師的指導(dǎo)下,獨(dú)立進(jìn)行研究工作所取得的成果,成果不存在知識(shí)產(chǎn)權(quán)爭(zhēng)議。 本聲明的法律后果由本人承擔(dān)。鍋爐存在熱效率低,燃煤質(zhì)量不穩(wěn)定,排煙溫度高等問(wèn)題,利用 PLC對(duì)鍋爐進(jìn)行過(guò)程控制是火電廠鍋爐控制領(lǐng)域的重要研究?jī)?nèi)容。 the coal quality is not stable, exhaust temperature is higher, so the boiler process control is an important research field of thermal power plant boiler control using PLC. Through the analysis of the furnace temperature, furnace pressure, drum level and superheater temperature, the design takes PLC as controller, and uses PID algorithm, pletes programming through STEP7 Micro/WIN ladder diagram. the temperature cascade control scheme, the pressure feedforward— feedback control scheme and the ratio control scheme of the furnace are designed , three impulses control scheme of the drum level and cascade control scheme of superheater are designed too, finally each control system can be run automatically . The interactive interface is designed using the King view software, finally using a password to land is achieved, screen can show ceaselessly, data report preview, print, save, refresh and transferred to the query is pleted ,the curve and alarm screen etc can be updated timely. Finally boiler control system can achieve security, stability and efficient operation. Keywords : Boiler ; PLC; Kingview 內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書(shū)(畢業(yè)論文) V 目 錄 摘 要 ........................................................................................................................................ III Abstract..................................................................................................................................... IV 第一章 緒 論 ............................................................................................................................ 1 火電廠鍋爐的發(fā)展現(xiàn)狀 ............................................................................................... 1 研究目的及意義 ........................................................................................................... 1 第二章 火電廠鍋爐生產(chǎn)工藝 .................................................................................................. 3 鍋爐的組成和分類(lèi) ....................................................................................................... 3 鍋爐的工藝流程簡(jiǎn)介 ................................................................................................... 4 第三章 火電廠鍋爐控制系統(tǒng)的總體方案設(shè)計(jì) ...................................................................... 7 控制方案的選擇 .......................................................................................................... 7 基于 PLC 的鍋爐控制系統(tǒng)方案設(shè)計(jì) ......................................................................... 7 鍋爐控制過(guò)程 ............................................................................................................... 8 爐 膛溫度控制系統(tǒng) ............................................................................................. 9 汽包液位控制系統(tǒng) ............................................................................................. 9 過(guò)熱器溫度控制系統(tǒng) ....................................................................................... 11 爐膛負(fù)壓控制系統(tǒng) ........................................................................................... 12 傳感器選型 ................................................................................................................. 14 執(zhí)行器選型 ................................................................................................................ 17 調(diào)節(jié)器選型 ................................................................................................................. 18 第五章 控制系統(tǒng)下位機(jī)設(shè)計(jì) ................................................................................................ 20 西門(mén)子 S7200 可編程控制器概述 ............................................................................ 20 系統(tǒng)的整體設(shè)計(jì)方案 ................................................................................................ 21 下位機(jī) PLC 的硬件設(shè)計(jì)過(guò)程 .................................................................................... 22 I/0 分配 .............................................................................................................. 22 硬件配置及連接圖 .......................................................................................... 23 STEP7 概述及 S7200 程序流程設(shè)計(jì) ....................................................................... 24 程序編寫(xiě)及分析 ......................................................................................................... 31 第六章 控制系統(tǒng)上位機(jī)設(shè)計(jì) ................................................................................................ 33 內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書(shū)(畢業(yè)論文) VI 組態(tài)王軟件概述 ........................................................................................................ 33 鍋爐控制系統(tǒng)組態(tài)過(guò)程 ............................................................................................. 33 定義外部設(shè)備和變量 ...................................................................................... 33 創(chuàng)建組態(tài)畫(huà)面 ................................................................................................... 34 動(dòng)畫(huà)連接 .......................................................................................................... 35 組態(tài)畫(huà)面顯示 ............................................................................................................ 36 初始值設(shè)定 ...................................................................................................... 36 實(shí)時(shí)曲線和歷史曲線顯示 ............................................................