三回程結(jié)構(gòu)設(shè)計熱力計算

,,CWNS0.70-90/70-Y（中心回焰結(jié)構(gòu)）熱力計算,,,共頁,

,,,,,第頁,

序號,名稱,符號,單位,公式,結(jié)果,

一）鍋爐規(guī)范,,,,,,

1,鍋爐額定熱功率,Q,MW,60×104Kcal/h,0.700,

2,額定工作壓力,P,Mpa,表壓,0.000,

3,額定供水溫度,Tcs,℃,,90.000,

4,額定回水溫度,Ths,℃,,70.000,

5,冷空氣溫度,Tlk,℃,,30.000,

二）燃料及煙氣特性參數(shù)（0#輕柴油）,,,,,,

1,水分,Wy,%,,0.00,

2,灰分,Ay,%,,0.01,

3,碳,Cy,%,,85.55,

4,氫,Hy,%,,13.49,

5,氧,Oy,%,,0.66,

6,氮,Ny,%,,0.04,

7,硫,Sy,%,,0.25,

8,低位發(fā)熱計算值,Qydw,Kcal/Kg,81Cy+246Hy-26（Oy-Sy）-6Wy,10237.43,

9,理論空氣量,V0,Nm3/kg,0.0889Cy+0.265Hy-0.0333Oy+0.0333Sy,11.17,

10,RO2容積,VRO2,Nm3/kg,1.886/100（Cy+0.375Sy）,1.62,

11,N2理論容積,V0N2,Nm3/kg,0.79V0+0.008Ny,8.82,

12,H2O理論容積,V0H2O,Nm3/kg,0.0124Wy+0.111Hy+0.0161V0,1.68,

13,平均過量空氣系數(shù),αpj,,取用,1.10,

14,實際H2O容積,VH2O,Nm3/kg,V0H2O+0.016（αpj-1）V0,1.70,

15,煙氣的平均容積,Vy,Nm3/kg,VRO2+V0N2+VH2O+（αpj-1）V0,13.25,

16,RO2容積份額,rRO2,,VRO2/Vy,0.12,

17,H2O容積份額,rH2O,,VH2O/Vy,0.13,

18,三原子氣體容積份額,rq,,rRo2+rH2o,0.25,

三）鍋爐熱平衡及燃料消耗量計算,,,,,,

1,冷空氣焓,I0LK,Kcal/Kg,查燃油煙氣焓溫表,105.90,

2,排煙溫度,θpy,℃,假定,200.00,

3,排煙熱焓,Ipy,Kcal/Kg,℃,879.20,

4,排煙熱損失,q2,%,（Ipy-αpj*I0lk）/Qydw,7.450209672,

5,化學不完全燃燒損失,q3,%,估取,1,

6,散熱損失,q5,%,估取,3,

7,鍋爐效率,η,%,100-q2-q3-q5,88.54979033,

8,燃料消耗量,Bj,kg/h,Q*103*860/（Qydw*η）,66.40763424,

9,保熱系數(shù),φ,,η/（η+q5）,0.967230946,

四）燃燒室傳熱計算,,,,,,

1,爐膽結(jié)構(gòu)特性計算,,,,,

1.1,爐膽直徑,d,m,按結(jié)構(gòu),0.8,

1.2,爐膽長度,L,m,按結(jié)構(gòu),1.88,

1.3,輻射受熱面積,Hf,m2,3.14*d*L+3.14*d^2/4,5.22496,

1.4,爐膛包覆面積,FL,m2,Hf+3.14*d^2/4,5.72736,

1.5,爐膛有效容積,VL,m3,L*3.14*d^2/4,0.944512,

1.6,爐膛有效輻射層厚度,S,m,3.6*VL/FL,0.593684211,

2,燃燒室熱力計算,,,,,

2.1,空氣帶入燃燒室熱量,Qk,Kcal/Kg,αpj*I0LK,116.49,

2.2,燃燒室每Kg燃料輸入熱量,QL,Kcal/Kg,Qydw*（100-q3）/100+QK,10251.5457,

2.3,絕熱燃燒溫度,θjr,℃,查燃油煙氣焓溫表,1964,

2.4,絕熱燃燒絕對溫度,Tjr,K,θjr+273,2237,

2.5,中心火焰出口假定溫度,θlc,℃,先假定后校核,1150,

2.6,中心火焰出口煙氣焓,Icy,Kcal/Kg,查燃油煙氣焓溫表,5675.26,

2.7,燃燒室出口絕對溫度,Tlc,K,θlc+273,1423,

2.8,受熱面灰污系數(shù),ξ,,查《鍋爐原理及計算》P271,0.65,

2.9,有效輻射受熱面,Hfs,m2,ξ*Hf,3.396224,

2.10,受熱面平均熱有效系數(shù),ψpj,,Hfs/Hf,0.65,

2.11,三原子氣體總分壓力,Pq,MPa,0.1013*rq,0.025310191,

2.12,三原子氣體輻射力,,m.Mpa,Pq*S,0.015026261,

2.13,三原子氣體輻射減弱系數(shù),Kp,1/(m.Mpa),10.2*(0.78+1.6*RH2O)/(10.2PqS)^0.5-0.1)*(1-0.37*Tlc/1000)*rq,2.914451437,

2.14,碳黑顆粒輻射減弱系數(shù),Kth,1/(m.Mpa),0.306*（2-αpj）*（1.6*Tlc/1000-0.5）*Cy/Hy,3.103205567,

2.15,火焰發(fā)光黑度,afg,,1-e^(-(Kp*rq+Kth)*0.1013*s),0.205800622,

2.16,火焰不發(fā)光黑度,aq,,1-e^(-Kp*rq*0.1013*s),0.042848226,

2.17,爐膛容積熱負荷,qv,Kcal/m3.h,Qydw*Bj/VL,719782.8159,

2.18,系數(shù),m,,查《鍋爐原理及計算》P274,0.796,

2.19,火焰黑度,ah,,m*afg+（1-m）*aq,0.172558333,

2.20,爐膛系統(tǒng)黑度,aL,,ah/（ah+（1-ah）*ψpj）,0.242904626,

2.21,火焰中心高度系數(shù),M,,查《鍋爐原理及計算》P272,0.445,

2.22,煙氣平均熱容積,V-c,KJ/（Kg.℃）,4.1868*（QL-Icy）/（θjr-θlc）,23.5380749,

2.23,爐膛出口煙溫,tlc,℃,Tjr/（M*（5.7*10-11*aL*ψpj*Hf*Tjr^3/（φ*Bj*V-c））^0.6+1)-273,1208.868427,

2.24,計算與假設(shè)值差,Δt,℃,θlc-tlc,-58.86842673,

2.25,結(jié)論,,,Δt允許范圍-100＜Δt＜100,合格,

2.26,輻射換熱量,Qf,Kcal/kg,φ*（QL-Icy）,4426.325148,

2.27,爐膛出口煙溫,θlc‘,℃,假定,840,

2.28,出口煙氣焓,Icy，,Kcal/Kg,查燃油煙氣焓溫表,4010.43,

2.29,回流平均煙氣溫度,θhl,℃,（θlc+θlc’）/2,995,

2.30,火焰直徑,Dhy,m,按百得燃燒器取值,0.5,

2.31,回流煙氣流速,Whl,m/s,Bj*Vy*（θhl+273）/（273*3600*0.785*（d^2-Dhy^2)),3.707802397,

2.32,普郎特數(shù),Pr,,查《鍋爐計算手冊上》P62,0.5805,

2.33,導熱系數(shù),λ,W/m.℃,查《鍋爐計算手冊上》P62,0.10885,

2.34,煙氣粘滯系數(shù),V,m2/S,查《鍋爐計算手冊上》P62,0.00017321,

2.35,雷諾數(shù),Re,,Whl*d/V,17125.11932,

2.36,努塞爾數(shù),NU,,0.664*Re^0.5*Pr^0.333,72.4988342,

2.37,換熱系數(shù),ad,W/m2.℃,λ*NU/（d-Dhy）,26.30499368,

2.38,溫壓,Δt1,℃,θhl-Tcs,905.000,

2.39,爐膽內(nèi)對流換熱量,Qd,Kcal/kg,0.86*ad*Δt1*Hf/Bj,1610.831795,

2.40,爐內(nèi)換熱總量,Qcr,Kcal/kg,Qf+Qd,6037.156943,

2.41,爐膽煙氣放熱量,Qrp,Kcal/kg,φ*（QL-Icy’）,6036.600244,

2.42,相對誤差,ΔQ,%,100*（Qrp-Qcr）/Qrp,-0.009222064,

2.43,結(jié)論,,,ΔQ允許范圍-2%＜ΔQ＜2%,合格,

四）對流管傳熱計算,,,,,,

1,對流管結(jié)構(gòu)參數(shù),,,,,

1.1,對流管內(nèi)徑,dn,m,按結(jié)構(gòu),0.045,

1.2,對流管長度,Lg,m,按結(jié)構(gòu),1.95,

1.3,對流管枝數(shù),N,,按結(jié)構(gòu),58,

1.4,對流受熱面面積,Hdl,m2,N*3.14*dn*lg,15.98103,

1.5,對流管流通面積,Fdl,m2,N*3.14*dn^2/4,0.09219825,

1.6,擾流子長度,L4,m,按結(jié)構(gòu),1.950,

1.7,擾流子節(jié)距,S,m,按結(jié)構(gòu),0.113,

1.8,擾流子寬度,B,m,按結(jié)構(gòu),0.040,

1.9,擾流子厚度,δ,m,按結(jié)構(gòu),0.0008,

1.1O,擾流子扭曲比,Y,,S/B,2.825,

2,對流面?zhèn)鳠嵊嬎?,,,,

2.1,出口煙氣溫度,θ”,℃,先假定后校核,200,

2.2,出口煙氣焓值,Icy”,Kcal/Kg,查燃油煙氣焓溫表,879.25,

2.3,煙氣側(cè)放熱量,Qrp2,Kcal/Kg,φ*（Icy’-Icy”）,3028.574194,

2.4,大溫壓,Δt2,℃,θlc’-Tcs,750.000,

2.5,小溫壓,Δt3,℃,θ”-Tcs,110.000,

2.6,平均溫壓,Δtpj,℃,（Δt2-Δt3）/LN（Δt2/Δt3）,333.4040357,

2.7,煙氣計算溫度,Δt4,℃,（θlc’+θ”）/2,520.000,

2.8,煙氣流速,W,m/s,Bj*Vy*（Δt4+273）/（273*3600*Fdl),7.699847087,

2.9,含擾流子煙管水力直徑,Dh,m,（3.14*dn-4*δ）/（3.14+2-2*δ/dn）,0.027054854,

2.1O,含擾流子對流管煙氣流速,W',m/s,W*dn/（dn-4*δ/3.14）,7.878264978,

2.11,普郎特數(shù),Pr,,查《鍋爐計算手冊上》P62,0.628,

2.12,導熱系數(shù),λ,W/m.℃,查《鍋爐計算手冊上》P62,0.06732,

2.13,煙氣粘滯系數(shù),V,m2/S,查《鍋爐計算手冊上》P62,0.000079762,

2.14,雷諾數(shù),Re,,W’*Dh/V,2672.266367,

2.15,努塞爾數(shù),NU,,0.338*（Re/Y）^0.662*Pr^0.35,26.80542837,

2.16,換熱系數(shù),ad2,W/m2.℃,λ*NU/Dh,66.69935928,

2.17,溫壓,Δt5,℃,Δtpj-Tcs,243.404,

2.19,煙管煙氣有效輻射層厚度,S’,m,0.9dn,0.0405,

2.2,三原子氣體輻射減弱系數(shù),Kp’,1/(m.Mpa),10.2*(0.78+1.6*RH2O)/(10.2PqS’)^0.5-0.1)*(1-0.37*（Δt4+273）/1000)*rq,17.16127444,

2.21,氣體介質(zhì)吸收力,kps,1/(m.Mpa),Kp’*0.1013*S’,0.070406703,

2.22,煙氣黑度,ay,,1-e^(-kps),0.06798531,

2.23,溫度比,τ,,（Tcs+60+273）/（Δt4+273）,0.533417402,

2.24,煙氣輻射放熱系數(shù),af2,W/m2.℃,5.1*10-8*ay*（Δt4+273）^3*(1+τ^2）*（1+τ）,3.405735011,

2.25,熱有效系數(shù),ψ,,估取,0.85,

2.26,總傳熱系數(shù),K,,ψ*（ad+af）,59.58933015,

2.27,煙管總的傳熱量,Qcr2,Kcal/kg,0.86*K*Δt5*Hdl/Bj,3001.798162,

2.28,相對誤差,ΔQ,%,100*（Qrp2-Qcr2）/Qrp2,0.884113467,

2.29,結(jié)論,,,ΔQ允許范圍-2%＜ΔQ＜2%,,

五）鍋爐總熱平衡校核