基于脈沖點(diǎn)火時(shí)序控制的加熱爐新型燃燒控制方法的研究.pdf

1、摘要東北大學(xué)博士論文摘要本文以國(guó)家自然科學(xué)基金項(xiàng)目“新型智能0燒控制系統(tǒng)碩研究”為背景，密切結(jié)合加熱爐爐溫控制中常規(guī)燃燒控制方式存在的諸多缺鳴幾個(gè)方面的工作:合要完成了以下1.針對(duì)常規(guī)姍燒控制中存在的諸多缺陷，提出了脈沖燃燒的控制方法。針對(duì)脈沖然燒方式，從幅值特征、頻譜特征、相關(guān)特征等方面對(duì)脈沖射流條件下的壓力波動(dòng)特性進(jìn)行分析并與穩(wěn)態(tài)射流進(jìn)行對(duì)比。同時(shí)對(duì)脈沖射流的機(jī)理進(jìn)行了分析。研究結(jié)果表明:脈沖射流可以極大的提高射流區(qū)壓力波動(dòng)的水平，

2、從而促進(jìn)爐內(nèi)傳熱和溫度均勻性。2.提出了墓于脈沖姍燒方式的新型智能變結(jié)構(gòu)燃燒控制方法。當(dāng)爐溫處于低溫運(yùn)行狀態(tài)時(shí)，該控制方法采用脈沖點(diǎn)火方式改變了常規(guī)控制中對(duì)然料與空氣t連續(xù)給進(jìn)線性調(diào)節(jié)方式，而采用不同燒嘴智能聯(lián)控方式。燒嘴閥門不采用線性調(diào)節(jié)閥，而選用開(kāi)關(guān)閥，燒嘴工作只有兩種狀態(tài)，或者開(kāi)度一定，即每次打開(kāi)時(shí)空氣和燃料的給進(jìn)t不變，關(guān)閉時(shí)將嫩料和空氣完全關(guān)閉，只控制每個(gè)燒嘴的開(kāi)關(guān)時(shí)間，從而達(dá)到控制嫌料與空氣的給進(jìn)量，控制爐溫的目的。由于每個(gè)

3、燒嘴閥門的開(kāi)度可以事先選擇，即選擇最佳的開(kāi)度，使嫩料與空氣的比例達(dá)到最佳.該控制方法實(shí)現(xiàn)了空燃比常規(guī)線性控制(爐窯處于高溫運(yùn)行狀態(tài)時(shí))和脈沖嫩燒非線性控制中窯處于低溫運(yùn)行狀態(tài)時(shí))兩種控制方式的自動(dòng)切換。該方法實(shí)現(xiàn)了不同溫度設(shè)定下保證溫度控制精度和爐內(nèi)溫度均勻分布的嫩燒回路工作模式的自動(dòng)生成，特別是在爐窯處于低溫運(yùn)行狀態(tài)時(shí)自動(dòng)確定燒嘴的個(gè)數(shù)及循環(huán)開(kāi)啟方式.東北大學(xué)博士論文This由ssertationisrootedinoneofthen

4、ationalnamed“theresearchforanewtypeofinteligentconalnaturalscienceombustioncontrolsyfindsubjectstem“.Intheviewoftheproblemofinefectivecombustionandcontrolresultsinthereheatingfurnaceusingtheconver幣0耐me比司sresearchedandpro

5、posedasfolows:somenewusabletechniqueshavebeenAnewpulsecombustionmethodispresented.Thedynamicalcharacteristicsofpressurefieldofpulsatingisothermalfreejetaresystematicalystudied勿meansoftheknowledgeaboutamplitudesticphasech

6、aracteristicandrelativeic.Thecorrespondingresultsofsteadyjetaregiven.pressureoscilationamplitudeisimproveheattransferandtemperatureconsumption.beingcomparedwithjetisanalyzed.Theresultgreatlybyusingpulsatinguniformi訊reduc

7、escaleAtthemeantimethemechanismofpulseresulsshowthattheenhancedjetflow.ItcanlossandfuelAnewtypeofvariablestructurecombustioncontrolmethodbasedonpulseispresented.Differingfromconventionalcombustioncontrolapulsefit初9system

8、usesfrequencymodulationtocontroltheburnersma邵venzone.doesnotregulatetheamplitudeofthefuelinputtotheentirezonethefrequencyatwhicheachburnerwithinthezoneisfiredataselecteddesignandatafrequencyproportionaltotheheatdemandina

9、predeterminedfiringWhichburnersareonorofinanygiventimeintervalsignalfromthetemperaturecontroller.Thiskindofnewdependingonthedemandcombustioncontrolmethodcanguaranteethebestairfuelratioandmakefiunacesalwaysworkinginthebes

10、tburningstate.Thiscombustionmethodcanachievethetransformautomaticallyfromtheconventionalcombustionmethodwhenthetemperatureerrorishightopulsecombustionmethodwhenthetemperatureerrorisrelativelylow.Thiscombustionmethodcanal

11、soprovide伽onofnumberofburnersandcirculatingwaysautomaticalytoguaranteethetemperatureaccuracyanduniformityinthefurnaceespecialyforthefinnaceofthelowandmediatemperature.Anintelligentcombustioncontrollerbasedonthepulsecombu

12、stionisdesigned.Itsdynamicalandsteadycharacteristicsareanalyzed.Thecontrolleristested妙meansofthedatafromtherealprocess.Thesimulationshowstheefectiveoftheconventionalparametertuningmethodsintheindustrialprocessesareshowst