氣化工藝計(jì)算(16K)

PAGEPAGE6氣化工藝計(jì)算：計(jì)算依據(jù)工業(yè)分析WfAfVfXfQ1.029.64541.4847.85526.31元素分析CfHfOfNfS74.825.275.521.192.56灰熔點(diǎn)(℃)T1T2T3110011801220操作溫度：1350℃操作壓力：3.0MPa水煤漿濃度：64.3%氧純度：99.6%氣化爐碳轉(zhuǎn)化率：97%出口煤氣含CH4：0.05%捕渣率：60%粗煤氣中帶出灰含碳量：20%渣中含碳量：43%煤中S全部轉(zhuǎn)化為H2S及COS二、計(jì)算過(guò)程：以100kg無(wú)水無(wú)灰基為基礎(chǔ)。1、將煤元素分析轉(zhuǎn)化成無(wú)水無(wú)灰基xr=100xf÷(100-Af-Wf)=100xf÷89.335CrHrOrNrSrΣVr83.755.906.1611.342.8510046.432、煤的發(fā)熱量計(jì)算：Qr=80Cr+300Hr+10Nr+40Sr－(Or)2－0.5Vr=80×83.75＋300×5.90＋10×1.34＋40×2.85－6.162－0.5×46.43=8536.24kcal/100kgdaf煤3、實(shí)際投煤量Ar=100Af÷89.335=10.8kg/100kgdaf煤Wr=1.14kg/100kgdaf煤投煤量為100+Ar＋Wr=111.94kg水煤漿濃度為64.3%加入水量為111.94×35.7/64.3=62.15kg氣化爐排渣：10.8×60%÷43%=15.07kg排灰量10.8×(1－60%)×80%=3.46kg4、物料平衡：設(shè)入氣化爐氧量為xkmol/100kgdaf煤出口煤氣含CO=akmol/100kgdaf煤H2=bkmol/100kgdaf煤CO2=mkmol/100kgdaf煤H2O=hkmol/100kgdaf煤CH4=0.0005Vkmol/100kgdaf煤Σ千克=Vkmol/100kgdaf煤(1)、碳平衡：入氣化爐煤：C入=83.75÷12=6.98kmol出氣化爐：粗煤氣中：C=a＋m＋0.0005V飛灰中：C=10.8×40%×20%÷12=0.072kmol渣中含：C=10.8×60%×43%÷12=0.23kmolC入=C出6.98=a＋m＋0.0005V＋0.072＋0.23a＋m＋0.0005V=6.678①(2)、氫平衡：入氣化爐煤中含H2=5.9÷2=2.95kmol/100kgdaf煤煤中水含H2=100×1.02÷89.335÷18=0.06kmol/100kgdaf煤煤漿中水含H2=62.15÷18=3.45kmol/100kgdaf煤H入=2.95＋0.06+3.45=6.46出氣化爐：煤氣中H2=bkmolCH4中H2=0.0005V×2=0.001VkmolH2S中含H2=2.85÷34=0.08kmol水蒸汽中含H2=hkmolH出=b＋0.001V＋0.08＋hH入=H出6.46=b＋0.001V＋0.08＋hb＋0.001V＋h=6.38②(3)、氧平衡入氣化爐氧入爐氧氣：0.996xkmol煤中含O2=6.16÷32=0.19kmol煤中H2O中O2=1.14÷(18×2)=0.03kmol煤漿中H2O中O2=62.15÷(18×2)=1.73kmolO入=0.996x＋0.19＋0.03＋1.73=1.95+0.996x出氣化爐CO含O2=0.5aCO2含O2=m蒸汽中含O2=0.5hO出=0.5a+m+0.5hO入=O出1.95+0.996x=0.5a+m+0.5ha+2m+h-1.922x=3.9③(4)、出口干氣平衡CO=akmol/100kgdaf煤H2=bkmol/100kgdaf煤CO2=mkmol/100kgdaf煤CH4=0.0005Vkmol/100kgdaf煤N2=1.34÷28=0.047H2S=2.85÷34=0.084Ar=0.004xV=a+b+m+0.0005V+0.047+0.084+0.004xa+b+m-0.9995V-0.004x=-0.131④(5)水煤氣反應(yīng)在3.0MPa及1350℃時(shí)反應(yīng)平衡常數(shù)取0.53709mb=0.53709ah⑤5、熱量平衡：以0℃為基準(zhǔn)A、求ΣQ輸入(1)、煤的熱值Qr=8536.24kcal輸入熱量：8536.24×100=853424kcal/100kgdaf煤(2)、煤帶入顯熱量：cp煤’=0.265kcal/kg.℃Q’煤=cp煤’×100×25=662.5kcal/100kgdaf煤灰?guī)霟崃浚篶’’=0.23kcal/kg.℃Q’灰=0.23×10.8×25=62.1kcal/100kgdaf煤煤中水帶入熱量：c’水=1kcal/kg.℃Q’水=1.14×1×25=28.5kcal/100kgdaf煤煤漿中水的顯熱Q水=62.15×1×25=1553.75kcal/100kgdaf煤(3)、氧氣的顯熱4.0MPa，35℃時(shí)co2=0.977kJ/kg=7.30kcal/kg.℃QO2=7.3x×35=270.1xkcal/100kgdaf煤Q輸入=855930.82+270.1xB、求ΣQ輸出熱(1)、Q煤氣干煤氣帶出熱COH2H2SCH43034305261009527Q煤氣=22.4×(3034a＋3052b+6100×0.084+9527×0.0005V)=67691.6a+68364b+11477.76+106.7V(2)、煤氣的顯熱1350℃時(shí)COCO2CH4H2H2SN2Cp7.7812.4116.237.259.77.69Q顯熱=1350×[7.78a+7.25b+12.41m+16.23×0.0005V+9.7×0.084+7.69×(0.047+0.004x)]=10503a+9787.5b+16753.5m+10.96V+41.53x+1587.91(3)、水蒸汽的潛熱Q=597h(4)、水蒸汽的顯熱Q=13095hkcal/100kgdaf煤(5)、灰渣帶出顯熱Cp灰=0.262kcal/kg.℃Q灰=10.8×0.262×1350=3819.96kcal/100kgdaf煤(6)、灰渣和飛灰中未燃盡碳熱量：Cp碳=0.404kcal/kg.℃Qr碳=8536.24Q渣碳=10.8×60%×0.43/0.57×(0.404×1350+8536.24)=44394.88kcal/100kgdaf煤Q飛灰=10.8×40%×0.2/0.8×(0.404×1350+8536.24)=9808.17kcal/100kgdaf煤(6)、熱損失：全部熱損失按1%Q損=8536.24×1%=853.624kcal/100kgdaf煤ΣQ輸出=78194.6a+78151.5b+16753.5m+117.66V+13692.3h+41.53x+79544.92ΣQ輸入=ΣQ輸出78194.6a+78151.5b+16753.5m+117.66V+13692.3h－2285.7x=776385.93⑥以上物料平衡及熱量平衡整理得如下方程組：a＋m＋0.0005V=6.678①b＋0.001V＋h=6.38②a+2m+h-1.922x=3.9③a+b+m-0.9995V-0.004x=-0.131④mb=0.53709ah⑤78194.6a+78151.5b+16753.5m+117.66V+13692.3h－2285.7x=776385.93⑥解方程組得：1000042.8857146.0501000-40.8529-130.1690010040.8937136.6700010-42.8653-139.350000040.8489-123.398a=146.05－42.8857xb=－130.169+40.8529xh=136.67－40.8937xm=－139.35+42.8653xV=－123.398+40.8489x代入mb=0.53709ah809.25x2－4916.81x+7418.38=0x1=3.286kmolx2=2.789kmol(舍去)最后得：a=5.128kmolb=4.07kmolh=2.29kmolm=1.505kmolV=10.8394kmol數(shù)據(jù)計(jì)算整理如下：kmol/100daf煤Vm3%(干基)CO5.128114.86747.31H24.0791.16837.55CO21.50533.7113.88CH40.00540.1210.05H2S0.0841.880.77N20.0471.0530.44Σ10.8394242.592100一、煤耗：每1000m3煤氣耗無(wú)水無(wú)灰