【正文】
方便 ,結(jié)構(gòu)模塊化。 大型鍋爐輸煤控制系統(tǒng)的主要任務(wù)就是卸煤、運煤和上煤,以達到按時保質(zhì)保量為機組(原煤倉)提供燃煤的目的。前者主 要用于發(fā)電、工業(yè)生產(chǎn)及間接供熱;后者主要用于生活供暖和生活熱水,多用于集中供暖地區(qū)及賓館、飯店。 關(guān)鍵詞 : 鍋爐;輸煤系統(tǒng);皮帶運輸機;可編程邏輯控制器;梯形圖; Based On PLC,Programcontrolled Coal Conveying System Abstract Thermal power plant coal conveying system is the guarantee of safe and reliable operation of the power plant boiler is very important support system, is mainly responsible for generating sets of coal unloading, storage and coal. How to ensure the reliability of equipment operation, reduce the operating and maintenance personnel the labor strength, improve the economic benefit, has bee a topic worth studying. Programmable logic controller (PLC) is developing very rapidly in recent years, a wide application, microprocessor as the core, integrating microputer technology, automation technology and munication technology in the integration of general industrial control device. It has plete functions, convenient use, easy maintenance, strong monality, high reliability, high ratio of performance to price, has been in the areas of industrial control is widely used and bee a powerful tool to realize industrial automation. This article is based on Siemens S7200 PLC, programcontrolled coal conveying system is designed. Between various devices are realized safety interlock protection control function: the coal conveying system motor startstop is fairly strict control sequence. When starting, in order to avoid in front transport belt accident caused by the accumulation of coal material, system requirements inverse coal material flow direction in a certain time interval starting sequence. Stops in order not to make the transport belt accident, caused by residual coal feeding system requirements along the coal flow direction in a certain time interval sequence stops. PLC control system hardware design layout is reasonable, reliable work, convenient operation and maintenance, good work. With PLC programcontrolled coal SPC system, not only has realized the automation of the equipment operation management and monitoring, to improve the reliability and security of the system, and improve the working environment, improve the enterprise economic benefit and work efficiency. So the PLC programcontrolled coal conveying system has a certain value for engineering application and promotion. Key Words: Boiler; Coal conveying system; Belt conveyor; Programmable logic controller; Ladder diagram; 目 錄 中文摘要 ………………………………………… ………………………… ( I) 英文摘要 ………………………………………………………………… ( II) 1 緒論 .................................................. 1 ........................................................... 1 ........................................................... 2 ................................................... 2 ............................................... 3 2 可編程邏輯控制器 PLC 概況 ................................ 4 的概念及發(fā)展 ................................................ 4 可編程序控制器的歷史 ..................................... 4 可編程序控制器的硬件及工作原理 ................................. 5 可編程序控制器的基本結(jié)構(gòu) ................................. 5 可編程序控制器的物理結(jié)構(gòu) ................................. 6 3 系統(tǒng)的硬件設(shè)計 ......................................... 7 機型選擇 ........................................................ 7 ....................................................... 9 .................................................. 10 4 S7200PLC 及其開發(fā)環(huán)境介紹 .............................. 11 介紹 ..................................................... 11 介紹 .................................................... 15 5 系統(tǒng)的軟件設(shè)計 ........................................ 22 ...................................................... 22 .......................................... 25 .......................................... 26 ............................ 27 緊急停止部分控制 ........................................ 27 故障停止部分控制 ........................................ 27 6 上位機(觸摸屏)的設(shè)計 ................................. 38 .................................................... 38 .................................................... 38 .............................................. 39 .............................................. 40 .................................................... 41 .................................................... 42 7 結(jié)論 ................................................. 45 參考文獻 ................................................ 46 致謝 ....................................... 錯誤 !未定義書簽。停止時為了不使運輸皮帶上因殘留煤料而造成事故,系統(tǒng)要求順煤料流動方向按一定時間間隔順序停止。它具有功能齊全、使用方便、維護容易、通用性強、可靠性高、性能價格比高等優(yōu)點,已在工業(yè)控制的各個領(lǐng)域得到了極為廣泛的應(yīng)用,成為實現(xiàn)工業(yè)自動化的一種強有力工具。 本科畢業(yè)設(shè)計 (論文 ) 題目: 基于 PLC程控輸煤系統(tǒng)的設(shè)計與控制 本科畢業(yè)設(shè)計 (論文 ) 題目: 基于 PLC程控輸煤系統(tǒng)的設(shè)計與控制 基于 PLC 程控輸煤系統(tǒng)的設(shè)計與控制 摘 要 火力發(fā)電廠燃煤輸送系統(tǒng)是保證電廠鍋爐安全可靠運行的十分重要的支持系統(tǒng) , 主要負責(zé)對發(fā)電機組燃煤的卸載、儲存和上煤。 本文基于西門子公司的 S7200型 PLC,設(shè)計了程控輸煤系統(tǒng)。 PLC控制系統(tǒng)硬件設(shè)計布局合理,工作可靠,操作、維護方便,工作良好。 畢業(yè)設(shè)計(論文)知識產(chǎn)權(quán)聲明 .............................. 48 畢業(yè)設(shè)計(論文)獨創(chuàng)性聲明 ................................ 49 附錄 I 外文文獻 .............................. 錯誤 !未定義書簽。從 80 年代石橫工程全套引進第一臺 300MW 機組至今,鍋爐廠房控制系統(tǒng)、控制思路發(fā)生了很大的變化,其設(shè)計己基本成熟。整個輸煤控制 系統(tǒng)是鍋爐安全可靠運行十分重要的支持系統(tǒng),它是保證機組穩(wěn)發(fā)滿發(fā)的重要條件。 在現(xiàn)代控制系統(tǒng)中, PLC 已經(jīng)成為一種重要的基本控制單元,在工業(yè)控制領(lǐng)域中應(yīng)用前景極其廣泛。 本系統(tǒng)有遠程自動控制、現(xiàn)場手動控制兩種控制方式。緊急情況下,可操作上位機(觸摸屏)的急停按鈕,它將使現(xiàn)場所有運行中的受控設(shè)備立即停機。 完成可編程邏輯控制器 plc 梯形圖的編寫,以此實現(xiàn)程控輸煤系統(tǒng)的自動控制。 本設(shè)計 針對某熱電廠程控輸煤系統(tǒng)的實際情況和工藝流程的要求 , 對系統(tǒng)的硬件、軟件配置進行研究和選擇 , 最終形成一個先進的控制方案。 本文研究的目的及意義 目前在我國,能源主要靠以煤為燃料的火力發(fā)電廠提供。但對熱電廠而言,蒸汽工序的爐膛是不容許斷煤的。日累計運行時間達 810h 以上。采用 PLC 控制的電廠輸煤系統(tǒng)具有自動化水平高、控制和管理功能強大、操作簡便、可靠性高等特點。 可編程序控制器( Programmable Controller)本來應(yīng)簡稱 PC,為了與個人計算機( Personal Com