本文關(guān)鍵詞：大容量燃?xì)饨枪苁秸羝仩t水動(dòng)力計(jì)算　出處：《江蘇科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 角管式蒸汽鍋爐 水動(dòng)力計(jì)算 有向圖 非線性方程組 循環(huán)流速

【摘要】：隨著人們的環(huán)保意識(shí)增強(qiáng),角管式鍋爐的應(yīng)用市場(chǎng)逐漸增大,尤其是燃?xì)饨枪苁藉仩t,近年倍受重視。燃?xì)饨枪苁秸羝仩t水循環(huán)可靠,結(jié)構(gòu)強(qiáng)度高,鋼材消耗少,組裝方便,使其得到廣泛研究和應(yīng)用。但角管式蒸汽鍋爐的水動(dòng)力循環(huán)比一般鍋爐更為復(fù)雜,其水動(dòng)力系統(tǒng)的循環(huán)回路是相互嵌套關(guān)聯(lián),不是簡(jiǎn)單的串并聯(lián)關(guān)系,因此,壓差解法不能用于準(zhǔn)確求解角管式蒸汽鍋爐的水動(dòng)力特性計(jì)算。本文重點(diǎn)研究角管式蒸汽鍋爐的管道網(wǎng)絡(luò),基于圖論分析方法,提出水動(dòng)力系統(tǒng)的“有向圖”,利用質(zhì)量守恒和能量守恒定律建立描述“有向圖”的數(shù)學(xué)模型,然后編寫程序計(jì)算得到鍋爐的水動(dòng)力特性。以130t/h燃?xì)饨枪苁秸羝仩t作為研究對(duì)象,根據(jù)不同工況的數(shù)據(jù),最終判斷該角管式蒸汽鍋爐的運(yùn)行情況。1.不同類型鍋爐的水動(dòng)力系統(tǒng)是相似的,因此,鍋爐的水動(dòng)力系統(tǒng)都可以視為部分管道受熱的供水管網(wǎng)系統(tǒng)。利用圖論的知識(shí),把鍋筒、集箱等視為“節(jié)點(diǎn)”,各個(gè)管組視為“管段”,將鍋爐的管網(wǎng)系統(tǒng)轉(zhuǎn)化為“有向圖”模型,并寫出其相關(guān)特征矩陣。2.通過(guò)熱力計(jì)算,確定鍋爐各受熱面的吸熱量和其它熱力參數(shù)。將管網(wǎng)水動(dòng)力分析計(jì)算理論和鍋爐水動(dòng)力參數(shù)的計(jì)算方法結(jié)合起來(lái)。在鍋爐系統(tǒng)“有向圖”和鍋爐各個(gè)受熱面吸熱量的基礎(chǔ)上,利用質(zhì)量守恒和能量守恒定律,分別建立節(jié)點(diǎn)流量方程和回路能量方程。3.鍋爐系統(tǒng)的數(shù)學(xué)模型是由節(jié)點(diǎn)流量方程和回路能量方程組成的方程組,這是一組非線性方程組,只能數(shù)值計(jì)算求解。在MATLAB軟件中編寫程序求解這些非線性方程組,得到不同熱負(fù)荷的循環(huán)流速、回路蒸發(fā)量、含汽率、管組流量、管組壓降等鍋爐水動(dòng)力特性,然后進(jìn)行循環(huán)停滯校驗(yàn),確定鍋爐在不同熱負(fù)荷下能否正常地運(yùn)行。結(jié)果表明:在100%至50%熱負(fù)荷下,所研究的130t/h燃?xì)饨枪苁秸羝仩t的水動(dòng)力循環(huán)可以安全可靠地運(yùn)行。40%熱負(fù)荷是鍋爐的極限工況,此時(shí)的水動(dòng)力循環(huán)已經(jīng)變得不可靠。在30%熱負(fù)荷以下運(yùn)行,管組的循環(huán)流速和停滯校驗(yàn)系數(shù)都低于安全值,水動(dòng)力循環(huán)已經(jīng)不能提供足夠水來(lái)冷卻受熱管道。
[Abstract]:With the enhancement of people's awareness of environmental protection, the application market of corner tube boiler increases, especially gas corner tube boiler has attracted much attention. In recent years, gas corner tube steam boiler water circulation reliability, high structural strength, low steel consumption, convenient assembly, which has been widely studied and applied. But the water power cycle angle steam boiler is more complex than the general boiler, the hydrodynamic loop system is mutually nested Association, is not a simple parallel relationship, therefore, the pressure difference method can not be used to calculate the hydrodynamic characteristics of the exact solution of the corner tube steam boiler. This paper focuses on the research of corner tube steam boiler pipe network graph theory the analysis method based on the proposed water dynamic system "directed graph", using the mass conservation and energy conservation "to describe the establishment of mathematical model of map", then write a program to calculate the hydrodynamic characteristics of the boiler are . to 130t/h gas corner tube steam boiler as the research object, according to the different conditions of the data, the final judgment of water power system of the corner tube steam boiler.1. boiler of different types is similar, therefore, the hydrodynamic system of boiler can be regarded as part of the pipe heating water supply system using. The knowledge of graph theory, the drum, header as "nodes", each tube group as "tube", the network system of boiler into a "directed graph" model, and write the relevant characteristics of.2. matrix through thermodynamic calculation, determine the heating surface of boiler heat absorption and other thermal parameters. The water pipe network dynamic analysis method to calculate theory and boiler hydrodynamic parameters together. In the boiler system "to map" and the boiler heating surface heat absorption, the use of the law of conservation of energy and mass, were established The mathematical model of node flow equation and loop energy equation of.3. boiler system is composed of node equations of flow equation and loop energy equations, this is a set of nonlinear equations, numerical calculation can only be solved. Write a program to solve these nonlinear equations in MATLAB software, get the circulation velocity of different heat loads, loop evaporation. The steam flow rate, pipe, tube group pressure boiler hydrodynamic characteristics, then the circulation stagnation check, determine the boiler under different heat load can be in normal operation. The results showed that: in the 100% to 50% heat load, water power cycle 130t/h gas of corner tube steam boiler can be safe and reliable run the.40% heat load is the limit condition of boiler, the hydrodynamic circulation has become unreliable. Running in the 30% heat load, circulation flow tube group and stagnation are lower than the safety coefficient Value, the hydrodynamic cycle has not provided enough water to cool the heated pipe.

【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TK221

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