鍋爐余熱回收熱力計算(1)

1、CWNS1.4-85/65-Y 型常壓內(nèi)燃三回程濕背式燃氣熱水鍋爐熱 力 計 算 書RJ 有 限 公 司二零一二年六月動力公司熱力車間煙氣余熱回收RJ熱 力 計 算 書序號名稱符號公 式 及 來 源數(shù)值單位一余熱回收規(guī)范1進口煙氣溫度Q給定1702出口煙氣溫度P給定253進口水溫t給定304出口水溫t給定455平均水溫t37.56冷空氣溫度tlk給定20二 燃料特性 (天燃氣)1CH495.9495%2C2H40%3C2H60.9075%4C3H80.1367%5C4H100%6C5H120%7H20%8O20%9CO0%10 CO23%11 H2S0.002%12 N20%13 H2O0.0

2、062%14應用基低位發(fā)熱量Qdwy35160kJ/m3三 燃料燃燒產(chǎn)物計算1理論空氣量V0.04760.5CO+0.5H2+1.5H2S+(m+n/4)CmHn-O29.3183Nm3/kg2N2理論容積VN20.79V0+N2/1007.3614Nm3/kg3RO2容積VRO20.01(CO2+CO+H2S+mCmHn)1.0118Nm3/kg4H2O理論容積VH2O0.01(H2S+H2+nCmHn/2+0.124dq)+0.016V02.1008Nm3/kg四 煙氣容積及特性計算1平均過量空氣系數(shù)apj取定1.052實際水蒸汽容積VH2OV0H2O+0.0161(pj-1)V02.10

3、830Nm3/Nm33煙氣總?cè)莘eVyVRO2+V0N2+VH2O+(pj-1)V010.9474Nm3/Nm34R2O容積份額rRO2VRO2/Vy0.0924%5H2O容積份額rH2OVH2O/Vy0.1926%6三原子氣體份額rrRO2+rH2O0.2850%7煙氣總重量Gy1-Ay/100+1.306apjV013.7781kg/Nm3動力公司熱力車間煙氣余熱回收RJ熱 力 計 算 書序號名稱符號公 式 及 來 源數(shù)值單位100crrrQQQ-21t-q11t-q 五 煙氣溫焓表(見后)六回收熱量熱力計算12345保溫系數(shù)0.98006煙氣進口溫度1707進口煙焓I3105.46kJ/N

4、m38煙氣出口溫度先假設(shè)309出口煙焓I247.16kJ/Nm3I10 煙氣放熱量Qrp(I-I)2801.130154kJ/Nm3熱功率W2.421794884MW.節(jié)能器熱力計算序號名 稱符號計算公式或來源數(shù) 值單位1進口煙溫l由上表決定170.002進口煙焓I查焓溫表3105.46KJ/m33出口煙溫l假定50.004出口煙氣絕對溫度Tll+273323.00K5出口煙焓Il查焓溫表247.16KJ/m36煙氣側(cè)對流放熱量Qrp(I- I-(I+ I)/2)0.96（3640.52-2659.63）2801.13KJ/m37工質(zhì)流量Dgz設(shè)計給定#REF!kg/s8給水溫度t1設(shè)計給定3

5、0.009給水焓i1查附錄，二126.28KJ/kg10 節(jié)能器出口水焓Ii1QrpBj/Dgz=85.1942.94158.301336000.56#REF!KJ/kg11節(jié)能器出口水溫度t查附錄，二#REF!12 平均水溫tpj(t1+t2)/2=2037.89）2#REF!13 最大溫差td =228-37.89#REF!14 最小溫差tx =167.5-2020.0015受熱面的平均溫降t(td-tx)/ ln(td/tx)#REF!16 平均煙溫pjtpj+t=28.94+167.91#REF!17 導熱系數(shù)查表3-2#REF!W/(mK)18 運動粘度系數(shù)查表3-2#REF!m2/

6、s序號名 稱符號計算公式或來源數(shù) 值單位19煙氣普朗特準則數(shù)Pr查表3-20.66020平均煙氣的絕對溫度Tpj+273=196.85+273#REF!K21 煙氣流通面積Fab-n（ldl+n21D）-ca0.084m2 2100crrrQQQ-21t-q11t-q動力公司熱力車間煙氣余熱回收RJ熱 力 計 算 書序號名稱符號公 式 及 來 源數(shù)值單位100crrrQQQ-21t-q11t-qddFV9.046.36.3=qoHrTpsr)100037.01)(02.1109.5491.2(2-+)5.057.104(9.0)(+=+fdaajnmp yHCnmT-1 2. 0 ) 5 .

7、01 0 0 06 . 1)(2 (3 0 6. 0a4/)(26 . 022212ddnnndL-+pp22 煙氣容積VyVRO2+VH2O+VN20 +( pj-1) V0#REF!m3 3/kg23煙氣中水蒸汽容積份額rH2OVH2O/Vy#REF!24煙氣中三原子氣體容積份額rRO2VRO2/VyNm3/kg25 煙氣中飛灰濃度f hAar a f h /(100Gy)=00.2/（10013.908）#REF!kg/kg26 管徑d設(shè)計給定0.026m27 輻射層有效厚度s =0.90.0260.0234m28 煙氣流速wyBj Vy(pj+273) / ( 273F)=158.30

8、13360011.4770469.85（0.084273）#REF! m/s29 橫向節(jié)距1結(jié)構(gòu)給定75.00mm30 修正系數(shù)Cs=0.99910,Cz=11.0032 煙氣對流換熱系數(shù)dCsCz/d（wd/）0.6Pr0.33#REF!W/(m2 2)33 管壁灰污溫度tb按熱力計算標準方法按7-36條#REF!34管壁灰污絕對溫度 Tbtb+273=53.94+273#REF!K35 爐內(nèi)壓力p給定0.104MPa36三原子氣體減弱系數(shù)Kq#REF!1/m.MPa37碳黑粒子減弱系數(shù)Kg#REF!1/m.MPa38 煙氣輻射吸收力kps(kq+kg) ps=（15.3419+0.2076

9、）0.1040.0234#REF!39 煙氣黑度ay1-EXP(-kps)#REF!40 輻射放熱系數(shù)f5.710-8-8(1+ab b)/2 ay yTy y3 3(1-(Tb b/Ty y)4 4)/(1-Tb b/Ty y)#REF!W/(m2 2)41 熱有效系數(shù)按753，表710.9042 傳熱系數(shù)k#REF!W/m243 受熱面積H 2.59m2 244 傳熱量QchHt k/Bj103=2.59167.994.56158.301310003600#REF!KJ/m345 誤差百分數(shù)e（Qrp- Qch）/ Qrp100%=（942.94-936.56）942.94100#REF!

10、2%排煙溫度校核46常壓節(jié)能器出口煙焓I1I+Ilk-Qch/=3640+0.1248-936/0.962689.80KJ/kg47常壓節(jié)能器出口煙溫1查煙氣焓溫表 校核（1)給定-（1）計算=167-176=910176.00熱力計算匯總表序號名 稱符號單位熱平衡(爐膛)節(jié)能器1熱效率%#REF!2燃料消耗量Bm3/h#REF!3爐膛容積熱負荷(106)qvKW/m3#REF!4爐膛尺寸smm550145對流管尺寸smm3236進口煙溫#REF!#REF!7出口煙溫#REF!#REF!8煙氣流速wym/s#REF!9傳熱系數(shù)KW/m2#REF!ddFV9.046.36.3=qoHrTpsr)

11、100037.01)(02.1109.5491.2(2-+)5.057.104(9.0)(+=+fdaajnmp yHCnmT-1 2. 0 ) 5 . 01 0 0 06 . 1)(2 (3 0 6. 0a4/)(26 . 022212ddnnndL-+pp動力公司熱力車間煙氣余熱回收RJ熱 力 計 算 書序號名稱符號公 式 及 來 源數(shù)值單位100crrrQQQ-21t-q11t-qddFV9.046.36.3=qoHrTpsr)100037.01)(02.1109.5491.2(2-+)5.057.104(9.0)(+=+fdaajnmp yHCnmT-1 2. 0 ) 5 . 01 0

12、 0 06 . 1)(2 (3 0 6. 0a4/)(26 . 022212ddnnndL-+pp10受熱面積Hm2#REF!#REF!11吸熱量QKJ/m3#REF!#REF!12吸熱量百分比Q/Q%#REF!#REF!13平均過?？諝庀禂?shù)pj1.101.1014熱力計算誤差校核QQnet.q/100-（Qf+Qcr1+Qcr2+Qcr3+Qcr4）(1-q4/100)=3558889.46100-（11157.5+16635.8+2882.6+936.6）（1-0100）#REF!15比值%（Q/Qnet.q）100%255.735588100%0.49%0.5%，合格0.49100-20

13、0435.9705032200-300364.7772851300-400247.1639248 煙 氣 溫 焓 表VRO2=1.01177Nm3/Nm3V0N2=7.36142Nm3/Nm3V0H2O=2.1008Nm3/Nm3I0yI0KIy=I0y+(-1)I0k(C)RO2VRO2(C)RO2(C)N2V0N2(C)N2(C)H2OV0H2O(C)H2O(KJ/Nm3)(KJ/Nm3)(KJ/Nm3)C3+5+7(C)KV0(C)KII123456789101112100170172.00022130956.9852301151317.22122841446.206678132 123

14、0.0102281507.70719200358362.2122282601913.97046304638.64406242914.826751266 2478.6569743038.7595991531.052409300559565.5771943922885.67854463972.67171344423.927447403 3755.2584984611.6903721572.930773400772781.0833525273879.4708946261315.1025765975.656822542 5050.4965416228.1816491616.49127750099610

15、07.7189366644887.9860987951670.1382557565.84329684 6373.6893617884.5277581656.34610860012231237.3898188045918.5855779672031.4763439187.451738830 7734.1552199574.1594991689.63174170014611478.1901269466963.90790511472409.62085410851.71889980 9131.89411411308.313591734.15409280017041724.04926410938046.

16、03735813362806.6725912576.759211130 10529.6330113103.240861794.92727190019511973.95546612439150.25108515243201.62352314325.830071281 11936.6901614922.664581819.42372100022022227.908732139410261.8262417253623.88489316113.619861436 13381.0203516782.670881860.006298110024582486.920828154511373.40139192

17、64046468481595 14862.6235818649.599661866.92878120027172748.968222169612484.9765421314476.81084519710.755611754 16344.2268120527.966951878.367289130029773012.027382185113625.9973923454926.38265221564.407431913 17825.8300422455.698931927.73198140032413279.133606201014796.4639425585373.85

18、365723449.451212077 19354.0245724417.152431961.453505150035043545.228064216515937.4847927805840.23188625322.944742240 20872.9008326366.589791949.437352160037683812.334288232417107.9513430026306.61011627226.89575240322391.777128346.48461979.894818170040364083.487576248318278.417932286781.39155729143.297032567 23919.9716230339.295611992.811006180043044354.640864264219448.8844534587264.5762131068.101522730 25438.8478932340.043912000.748304190045724625.79415228052064