【正文】 間級(jí)抽的流量以及漏出和注入給水泵軸封的流量差，前置給水泵出口的總流量應(yīng)為給水泵入口的總流量，從前置泵和給水泵之間的抽出流量之和，每一給水泵系統(tǒng)應(yīng)設(shè)備用泵一臺(tái)，其容量應(yīng)根據(jù)給水泵的可用率及電網(wǎng)對(duì)該給水泵所連接的機(jī)組的要求，經(jīng)比較論證確定給水泵的揚(yáng)程。凝汽器側(cè)抽真空系統(tǒng)設(shè)置3臺(tái)50%容量水環(huán)式真空泵，電動(dòng)機(jī)與真空泵采用直聯(lián)式。本設(shè)計(jì)采用的是水環(huán)式真空泵。蒸汽剛剛進(jìn)入凝汽器時(shí)，空氣相對(duì)含量很小，凝汽器總壓力基本等于蒸汽分壓力。冷卻水泵（循環(huán)水泵）的作用是為凝汽器提供低溫冷卻水，并帶走汽輪機(jī)排汽在凝汽器中放出的熱量。凝汽器正常工作時(shí)，冷卻水由低壓側(cè)的兩個(gè)進(jìn)水室進(jìn)入，經(jīng)過(guò)凝汽器低壓側(cè)殼體內(nèi)冷卻水管，流入低壓側(cè)另外兩個(gè)水室，經(jīng)循環(huán)水連通管水平轉(zhuǎn)向后進(jìn)入高壓側(cè)靠的兩個(gè)水室，再通過(guò)凝汽器高壓側(cè)殼體內(nèi)冷卻水管流至高壓側(cè)兩個(gè)出水室并排出凝汽器，蒸汽由汽輪機(jī)排汽口進(jìn)入凝汽器，然后均勻地分布到冷卻水管全長(zhǎng)上，經(jīng)過(guò)管束中央通道及兩側(cè)通道使蒸汽能夠全面地進(jìn)入主管束區(qū)，與冷卻水進(jìn)行熱交換后被凝結(jié)；部分蒸汽由中間通道和兩側(cè)通道進(jìn)入熱井對(duì)凝結(jié)水進(jìn)行回?zé)帷?據(jù)試驗(yàn)資料及An選定171924噴嘴出汽角正弦值sinɑ1計(jì)算An時(shí)選定25噴嘴節(jié)距tnmm據(jù)試驗(yàn)資料選t,定tn26噴嘴寬度Bnmm據(jù)隔板撓度的要求選32307527噴嘴數(shù)zn只42718328噴嘴出口高度lnmm調(diào)節(jié)級(jí)選壓力級(jí)計(jì)算出43129429部分進(jìn)汽度e選定1130動(dòng)葉出口相對(duì)速度ω1m/s由速度三角形求得14931相對(duì)于的焓降△hw1kJ/kg1132動(dòng)葉理想焓降△hbkJ/kg△hb=Ωm△ht9233動(dòng)葉滯止焓降△hb*kJ/kg△hb*=△hb+△hw110334動(dòng)葉出口理想速度ω2tm/s34745335動(dòng)葉速度系數(shù)ψ查取36動(dòng)葉損失△hbξkJ/kg△hbξ=(1ψ2)△hb*37動(dòng)葉出口實(shí)際速度ω2m/sω1=ψω2t38動(dòng)葉出口絕對(duì)速度c2m/s由速度三角形求得20539余速損失△hc2kJ/kg40動(dòng)葉后壓力p2MPa查hs圖得41動(dòng)葉后溫度（干度）t2/x2186。F、在焓熵圖上通過(guò)各抽汽點(diǎn)的壓力，確定汽輪機(jī)的抽汽點(diǎn)。B、工質(zhì)在經(jīng)過(guò)進(jìn)汽機(jī)構(gòu)時(shí)產(chǎn)生進(jìn)汽節(jié)流損失。1低加疏水逐級(jí)自流式至凝結(jié)水中，因?yàn)槟┘?jí)抽汽量較大，減少了冷源損失。一方面提高三臺(tái)高加水溫；另一方面減少1高加溫差，使不可逆損失減少，以提高機(jī)組的熱經(jīng)濟(jì)性。關(guān)鍵詞：汽輪機(jī),鍋爐,熱力系統(tǒng)，輔機(jī)形式 AbstractThe design for the thermal part of the 300MW unit of local preliminary design, the design during the design selection only in accordance with the standards of safety and economic optimization does not take into account other factors, take lessons from Tieling Power Plant equipment selection and its programs. After the final design to determine the form of steam turbine and boiler. Some of which include the steam turbine inlet pressure, temperature, gas consumption, unit heat consumption, thermal efficiency of the plant, the plant heat rate, generation standard coal consumption rate. Maximum continuous boiler parts, including evaporation, boiler efficiency. In determining the form of end hosts on the basis of further development of the main auxiliary systems and identifies the major form. Which developed the system, including the formulation of the main steam piping system, reheat unit bypass system in the formulation, development of water supply piping system, heat recovery heater piping system formulation, the formulation of oxygen pipeline system to supplement the proposed water pipeline system sewage and sewage expansion devices proposed pipeline system cooler, seal piping systems in the formulation, the formulation of the milling system, etc. Have identified the main auxiliary mill, coal feeder, blower, induced draft fan, to the powder, coarse separator, feed water pump and so on. This design only in the selection criteria in accordance with the safe and economic optimization does not take into account other factors. Keywords: steam turbine, boiler, heating system, auxiliary form目 錄中文摘要......................................................................................................................................IAbstract.......................................................................................................................................II1. 原則性熱力系統(tǒng)的擬定計(jì)算................................................................................................1......................................................................1......................................................................................................1..............................................................................2..........................................................................................2..........................................................2......................................................................................................5.................................................................11.....................................................................................................13.....................................................................................................152. 汽機(jī)車間主要設(shè)備的確定....... ...........................................................................................18……………………………………………………..18.........................................................................................................22.....................................................................................................22.........................................................................................24.................................................................................25.........................................................................................25.................................................................................................26.........................................................................................26.....................................................................273. 鍋爐燃燒系統(tǒng)及其設(shè)備的選擇...........................................................................................29.....................................................................................................29.....................................................................................................32.................................................................................................33.........................................................................................................34 .................................................................................................36.........................................................................................................36......................................................................................................