燃煤電廠輸灰系統(tǒng)控制

電氣自動(dòng)化論文編號(hào):ZD865    論文字?jǐn)?shù):22700,頁(yè)數(shù):51

燃煤電廠輸灰系統(tǒng)控制——降低4#、5#爐輸灰系統(tǒng)非正常出料次數(shù)
 目  錄
摘 要   ... ... ... ... .
1  緒論
 1.1 概述... ... ... ..... .1
 1.2 本課題的主要任務(wù).. ... ... .. .2
2  XDPS-400簡(jiǎn)介
 2.1 XDPS-400的產(chǎn)生.. ... .......3
 2.2 XDPS-400的定義.. ......... .3  .
 2.3 XDPS-400的系統(tǒng)結(jié)構(gòu)..........3
 2.4 XDPS-400的系統(tǒng)特點(diǎn).. ... .... ..5
 2.5 XDPS-400的網(wǎng)絡(luò)結(jié)構(gòu).. ... ... ...8
 2.6 XDPS-400的硬件系統(tǒng).. ... .. . ..10
 2.7 XDPS-400的軟件系統(tǒng).. ... .. . ..10
3  電廠輸灰系統(tǒng)簡(jiǎn)介
 3.1 輸灰系統(tǒng)的定義.. ... .. .. ..14
 3.2 輸灰流程的介紹.. ...... .. ..14
 3.3 正壓氣力輸灰系統(tǒng)的組成.. . ... ... ..15
 3.4 正壓氣力輸灰系統(tǒng)（倉(cāng)泵）介紹.. . ... .... .16
 3.5 倉(cāng)泵輸灰系統(tǒng)工作原理及流程.... ... ..17
 3.6 正壓氣力輸灰系統(tǒng)的特點(diǎn).. ...... .18
4  降低4#、5#爐輸灰系統(tǒng)非正常出料次數(shù)的研究
 4.1 小組概況.. ... ... .. . .. 20
 4.2 設(shè)備簡(jiǎn)介.. ..... . . . . . .  .20
 4.3 選題理由... ... .. . . ... .22
 4.4 設(shè)定目標(biāo)值... .... . ... .23
 4.5 目標(biāo)可行性分析... ... .. ... .24
 4.6 原因分析... ..... ... .26
 4.7 要因確定... ... ... ...28
 4.8 制定對(duì)策... ... ... ...31
 4.9 實(shí)施對(duì)策... ... ... ...31
 4.10 效果檢查...... ... ..35
 4.11 鞏固措施... ...  ... .36
5  總結(jié)和改進(jìn)......38
致謝... ... . . ...39
參考文獻(xiàn)... ... ... ..40
附錄1  發(fā)電廠主要系統(tǒng)圖.. 41
附錄2  新華公司XDPS系統(tǒng)問題分析與處理47

摘  要
 華能長(zhǎng)興電廠在自動(dòng)化改造中, 選用了XDPS-400控制系統(tǒng)。實(shí)現(xiàn)了機(jī)組的集中監(jiān)控、AGC 和一次調(diào)頻功能, 達(dá)到了300 MW及以上機(jī)組的自動(dòng)化水平。
 結(jié)合工程實(shí)例介紹了XDPS-400計(jì)算機(jī)分散控制系統(tǒng)軟、硬件系統(tǒng)及其功能,說(shuō)明了DCS在單元機(jī)組綜合控制系統(tǒng)中的重要性。燃煤鍋爐的輸灰方式及輸灰系統(tǒng)對(duì)電廠的安全、經(jīng)濟(jì)運(yùn)行及環(huán)境保護(hù)有著重大的影響,介紹一種新型的干式輸灰技術(shù)──飛灰正壓濃相氣力輸送. 該系統(tǒng)具有明顯的節(jié)約能源、減少維修費(fèi)用、改善環(huán)境和利于綜合利用等優(yōu)點(diǎn)。并且根據(jù)華能長(zhǎng)興發(fā)電廠#4、#5號(hào)機(jī)組輸灰系統(tǒng)的設(shè)計(jì),介紹了正壓密相氣力除輸灰系統(tǒng)的工作原理、工作流程、設(shè)計(jì)參數(shù)和組成結(jié)構(gòu),并對(duì)其特點(diǎn)進(jìn)行了分析,為火力發(fā)電廠氣力輸灰系統(tǒng)的選擇提供參考。
 另外，針對(duì)我廠2 ×135 MW機(jī)組輸灰系統(tǒng)存在的問題,從輸灰用氣系統(tǒng)、輸灰管配置及控制策略對(duì)輸灰系統(tǒng)所產(chǎn)生的影響等方面進(jìn)行分析, 07年5月#4、#5爐輸灰控制系統(tǒng)取消了原有的PLC控制，改為DCS控制（新華XDPS  6.0）。在脫硫基建期間，新華公司對(duì)輸灰PLC進(jìn)梯形圖行了翻譯和組態(tài)，并仿真運(yùn)行了一段時(shí)間，未發(fā)現(xiàn)重要缺陷。然而在實(shí)際投用時(shí)，非正常出料次數(shù)急劇上升，從1-4月份（PLC控制）的9次/月，到5-6月份（DCS控制）達(dá)到33次/月之多。
 因此，找出原系統(tǒng)存在的不足,并提出了改進(jìn)方案。經(jīng)運(yùn)行實(shí)踐證明,改造是成功的。
 
關(guān)鍵詞: 125 MW機(jī)組; 正壓; 濃相; 氣力輸送

Abstract
 This paper introduces the XDPS-400 control system which is used in Changxin power plant. . The system has the function of centralized monitoring control , AGC and frequency regulation. Also it hasreached the automation level for generating units above 300 MW.
 With the practical project as example, the software system, hardware system and the function of XDPS-400 are introduced. The important of DCS in the comprehensive control system of power unit is presented. A new de-ashing method, known as the fly-ash air-transport technology with concentrated phase positive pressure, is introduced in this paper. Operating practices indicate that, this system are saving energy, lower maintenance cost, to improve environment and better comprehensive utilization etc., and can satisfy the requirements of coal-fired boilers for safety and economy operation in fossil power plant . In combination with the design of the ash handling system for the #4、#5 in Huaneng Power Plant, the principle, work flow, design parameters and structure of the pressurized seal pneumatic ash handling system are described with its features analyzed, which can provide reference for selecting pneumatic ash handling system in thermal power plants.
 Besides, the ash handling system existence in view of my factory 2 ×135 MW units the question, from the ash handling with to be mad that the system, the ash handling system tube disposition and the control policy to loses shade which the ash system produces to make a sound and so on aspects to carry on the analysis.In the May of 2007,the #4、#5 stove the ash handling system to cancel the original PLC control, changed the DCS control (New China XDPS 6.0). In desulphurization construction period, New China Corporation to the ash handling PLC to enter the trapezoidal chart good translation and the configuration, and simulation run period of time, have not discovered the important flaw. However throws the time in the reality, is unusual the material number of times to rise suddenly, from January to April (PLC control) 9/months, (the DCS control) achieve 33 time/month of many to May to June.
 So discovers the original system existence the insufficiency, and proposed the improvement program. Proved after the movement practice that the transformation is successful.
 
Keywords： 125 MW unit ; positive pressure; concentrated phase; air-transport