【正文】
焓降分配、幾何級數(shù)分配、等效熱降法以及循環(huán)函數(shù)法等,這些方法由于各自的假定條件不同,所得到的結(jié)果也不相同,實際應(yīng)用中尚沒有一種人們普遍公認的加熱器焓升分配方法?;責峒訜峒墧?shù)z。對于多級回熱循環(huán),壓力較低的回熱抽汽做功大于壓力較高的回熱抽汽做功大于壓力較高的回熱抽汽做功。另一方面,回熱提高了鍋爐的給水溫度,使工質(zhì)在鍋爐內(nèi)的平均吸熱溫度提高,使鍋爐的傳熱溫差降低。給水回熱加熱是指在汽輪機某些中間級抽出部分蒸汽,送入回熱加熱器對鍋爐給水進行加熱的過程;與之相應(yīng)的熱力循環(huán)叫回熱循環(huán)。凝結(jié)水精處理采用低壓系統(tǒng)。低壓缸為三層結(jié)構(gòu)(外缸、內(nèi)缸A、內(nèi)缸B),由鋼板焊接制成。該機組適用于大型電網(wǎng)中承擔調(diào)峰負荷。熱平衡法是發(fā)電廠設(shè)計、熱力系統(tǒng)分析、汽輪機設(shè)計最基本的方法,也是分析熱力系統(tǒng)的基礎(chǔ),至今仍在廣泛應(yīng)用。第一部分熱經(jīng)濟性計算分析常采用的方法主要分為兩類:從能量的數(shù)量角度分析的“熱力學第一定律分析法和從能量的質(zhì)量角度分析的“熱力學第二定律分析法”。因此,對高壓加熱器進行優(yōu)化設(shè)計,提高高壓加熱器的投入率,有利于提高循環(huán)的熱經(jīng)濟性。電廠回熱系統(tǒng)中的熱交換設(shè)備主要是給水加熱器和除氧器,利用汽輪機不同段位抽出的蒸汽對主凝結(jié)水和給水進行加熱和除氧,最終達到鍋爐所要求的給水溫度和品質(zhì)。關(guān)鍵詞 汽輪機 回熱系統(tǒng) 高壓加熱器 熱經(jīng)濟性 600MW機組AbstractWater Heat System is the core of power plant thermal system,It plays a decisive role in economy of thermal power plants. Currently, power plants using regenerative extraction steam to heat boiler feed water, raise the average temperature of endothermic to reduce the irreversible loss of endothermic. While also reducing exhaust parameters as much as possible, so that the steam turbine to maximize the expansion of doing work in reducing the loss of cold source. Thus, the ideal cycle also increases the thermal efficiency. So based on the use of the Rankine cycle Regenerative cycle thermal power plant to improve.Highpressure heater is used in steam turbine power,which has been made part of the steam to heat water to reduce the exhaust steam in the condenser of the heat loss and improve thermal efficiency. Can the operational pressure heater open in normal having a great impact on the economy of Power Plant Steam Turbine.Therefore, the study highpressure heat recovery steam extraction system and heater design to improve the power plant heat economy is of great theoretical and practical significance. In this paper, the third of Harbin Power Plant 600MW units, heat recovery system to its heat balance, power check and design of high pressure heater will supply important evidence for coal—fire pomer plant online monitoring system and will be useful to direct the optimizing operation for the coal—fired power plant.Keyword Turbine Regenerative system Highpressure heater Heat economy 600MW Unit1 前言節(jié)約能源是我國的一項基本國策。高壓加熱器是利用在汽輪機內(nèi)已作過一部分功的蒸汽來加熱給水,以減少排汽在凝汽器中的熱損失,從而提高循環(huán)熱效率。華中科技大學文華學院畢業(yè)設(shè)計論文華中科技大學文華學院畢業(yè)設(shè)計(論文)題 目:熱平衡計算、8號高壓加熱器設(shè)計學 生 姓 名: 學號:學 部 (系): 機 電 學 部專 業(yè) 年 級: 級熱力工程指 導 教 師:堂 職 稱:副 教 授2010 年 6月 27日目 錄中文摘要...............................................1Abstract.......................................1...............................................3.............................................3 .........................................3 .........................42. 回熱系統(tǒng)簡述及其熱經(jīng)濟性................ ............ 5.....................................5...............................5 ...........................53. 機組回熱系統(tǒng)的熱平衡計算................ ............ 7.................................7.....................................8 根據(jù)已知條件進行熱力計算............................8.....................16....................................16 高壓加熱器的結(jié)構(gòu)特點...............................17...................18............................18.......