【正文】 河北聯(lián)合大學輕工學院 畢業(yè)設計摘要 I COLLEGE OF LIGHT INDUSTRY, HEBEI UNITED UNIVERSITY 本設計是 針 對 75t/h 的中壓燃貧煤煤粉鍋爐進行的。本設計是在 現(xiàn)場 參觀的基礎上， 通過查閱大量的文獻和資料，結合所學專業(yè)知識， 對鍋爐進行了總體布置和全面的熱力計算。 目的是掌握鍋爐設計的一般計算方法及計算步驟。鍋爐總體結構采用單鍋筒 Π 型布置 ,上升煙道為燃燒室和凝渣管兩部分，水平煙道內(nèi)布置兩級懸掛對流過熱器，垂直下行煙道中布置兩級省煤器和兩級管式空氣預熱器。鍋爐爐膛全部布滿光管水冷 壁。對流過熱器分兩級布置， 由懸掛式蛇形管束組成，兩級過熱器之間 裝有鍋爐自制噴水減溫 裝置，省煤器和空氣預熱器 分別 采用兩級配合布置 。 本 鍋爐采用四角切圓燃燒方式與 分級配風的 直流煤粉燃燒器。最后根據(jù)計算結果用 CAD 繪制鍋爐總體圖及燃燒器部件圖。 河北聯(lián)合大學輕工學院 畢業(yè)設計摘要 II 關鍵詞 : 貧煤；中壓；熱力計算；四角切圓燃燒 ABSTRACT The design is 75t/h of medium pressure pulverized coal boilers of the ofleancoal. This design is on the base of visiting the power plant and referring lots of literatures and information, bined with professional knowledge learned, the overall layout of the boiler and prehensive thermodynamic calculation. Purpose is to master the boiler design and calculation of the general method steps. The overall structure of the single drum boiler Πtype layout, increase the flue pipe for the bustion chamber and condensate residue of two parts, the level of flue gas convection superheater arrangement of two hanging, vertical flue in the arrangement of two down and twotube economizer air preheater. All full of boiler furnace water wall tubes. Convection superheater arranged in two levels, snakelike tubes formed by the hanging, two were fitted between the boiler superheater spray made by temperature devices, Economizers use two tie layout. boiler bustion uses four corner tangentially bustion and the direct current burner of divided gradation distribute air. Finally, according to the calculated result, the boiler entire drawing and burner drawing are pleted with Auto CAD. 河北聯(lián)合大學輕工學院 畢業(yè)設計摘要 III Keywords: leancoal, mediumpressure, heat transfer calculation, four corner tangentially bustion 河北聯(lián)合大學輕工學院 畢業(yè)設計 目錄 IV 目 錄 引 言 ............................................................................................................................ 1 1 文獻綜述 .................................................................................................................. 2 立題的背景和意義 ........................................................................................... 2 鍋爐綜述 ........................................................................................................... 2 國內(nèi)的鍋爐展簡史 ....................................................................................... 3 國外的鍋爐展簡史 ....................................................................................... 4 本設計的主要研究內(nèi)容 ................................................................................... 5 本設計的任務 ................................................................................................... 5 2 燃貧煤煤粉鍋爐結構設計簡述及設備選型 .......................................................... 6 鍋爐總體布置方案論證 ...................................................................................... 6 給定鍋爐設計參數(shù)及燃料特性如下 ........................................................... 6 鍋爐基本方案 ............................................................................................... 6 鍋爐本體基本尺寸 ....................................................................................... 7 鍋爐各部分結構簡述 .......................................................................................... 7 鍋筒及鍋筒內(nèi)部設備 ................................................................................... 7 爐膛水冷壁系統(tǒng) ........................................................................................... 8 過熱器及氣溫調(diào)節(jié) ..................................................................................... 10 燃燒系統(tǒng) ..................................................................................................... 14 省煤器及空氣預熱器 ................................................................................. 15 護墻結構及密封裝置 ................................................................................. 19 剛性架及護板結構 ..................................................................................... 20 吹灰及除渣裝置 ......................................................................................... 21 3 鍋爐的熱力計算 .................................................................................................... 24 輔助熱力計算 ................................................................................................... 24 燃燒產(chǎn)物的容積計算 ................................................................................ 24 空氣平衡及溫焓表 .................................................................................... 24 燃燒室的設計與傳熱計算 ............................................................................... 24 燃燒室的尺寸確定 .................................................................................... 24 河北聯(lián)合大學輕工學院 畢業(yè)設計 目錄 V 煤粉燃燒器的型式及布置 ........................................................................ 24 爐膛水冷壁布置 ........................................................................................ 25 燃燒室輻射吸熱量的分配 ........................................................................ 25 凝渣管的布置及傳熱計算 ................................................................................ 26 過熱器的布置及傳熱計算 ................................................................................ 26 爐膛受熱量的熱量分配 .................................................................................... 27 省煤器的結構布置及熱力計算 ........................................................................ 28 空預器的結構布置及熱力計算 ....................................................................... 28 結 論 .......................................................................................................................... 29 參考文獻 ...................................................................................................