熱電站鍋爐水循環(huán)計(jì)算書

熱電站鍋爐水循環(huán)設(shè)計(jì)計(jì)算,,,,,,,,,

序號,計(jì)算項(xiàng)目,符號表示,參數(shù)來源,計(jì)算公式,國際單位,計(jì)算結(jié)果,參數(shù)說明,規(guī)范依據(jù),其他說明

一、基礎(chǔ)工藝參數(shù),,,,,,,,,

1,鍋爐蒸發(fā)量,D,設(shè)計(jì)值,D=1025,t/h,1025.00,額定蒸發(fā)量,設(shè)計(jì)任務(wù)書,1025t/h

2,過熱蒸汽壓力,P_s,設(shè)計(jì)值,P_s=17.5,MPa,17.50,過熱器出口壓力,設(shè)計(jì)任務(wù)書,17.5MPa

3,過熱蒸汽溫度,T_s,設(shè)計(jì)值,T_s=540,℃,540.00,過熱器出口溫度,設(shè)計(jì)任務(wù)書,540℃

4,給水溫度,T_feed,設(shè)計(jì)值,T_feed=275,℃,275.00,省煤器入口水溫,設(shè)計(jì)任務(wù)書,275℃

5,爐膛高度,H,設(shè)計(jì)值,H=50,m,50.00,爐膛總高度,結(jié)構(gòu)設(shè)計(jì),從冷灰斗到爐頂

6,飽和溫度,T_sat,查表值,T_sat=350,℃,350.00,飽和溫度,水蒸氣性質(zhì)表,17.5MPa

7,飽和水密度,ρ',查表值,ρ'=580,kg/m3,580.00,飽和水密度,水蒸氣性質(zhì)表,17.5MPa

8,飽和蒸汽密度,ρ'',查表值,ρ''=50,kg/m3,50.00,飽和蒸汽密度,水蒸氣性質(zhì)表,17.5MPa

9,重力加速度,g,常數(shù),g=9.81,m/s2,9.81,重力加速度,物理常數(shù),標(biāo)準(zhǔn)重力加速度

10,設(shè)計(jì)循環(huán)倍率,K_design,設(shè)計(jì)值,K_design=5.0,,5.00,設(shè)計(jì)循環(huán)倍率,T/CSEE0267,4-10范圍

二、循環(huán)回路結(jié)構(gòu)參數(shù),,,,,,,,,

11,下降管外徑,d_o_xj,設(shè)計(jì)值,d_o_xj=426,mm,426.000,下降管外徑,結(jié)構(gòu)設(shè)計(jì),φ426×20

12,下降管壁厚,δ_xj,設(shè)計(jì)值,δ_xj=20,mm,20.000,下降管壁厚,強(qiáng)度計(jì)算,滿足強(qiáng)度要求

13,下降管根數(shù),n_xj,設(shè)計(jì)值,n_xj=6,,6.000,下降管根數(shù),結(jié)構(gòu)設(shè)計(jì),6根集中下降管

14,下降管長度,L_xj,設(shè)計(jì)值,L_xj=45,m,45.000,下降管總長度,結(jié)構(gòu)設(shè)計(jì),從鍋筒到下集箱

15,上升管外徑,d_o_s,設(shè)計(jì)值,d_o_s=60,mm,60.000,上升管外徑,結(jié)構(gòu)設(shè)計(jì),φ60×6

16,上升管壁厚,δ_s,設(shè)計(jì)值,δ_s=6,mm,6.000,上升管壁厚,強(qiáng)度計(jì)算,滿足強(qiáng)度要求

17,上升管根數(shù),n_s,設(shè)計(jì)值,n_s=1200,,1200.000,上升管根數(shù),結(jié)構(gòu)設(shè)計(jì),膜式水冷壁

18,上升管長度,L_s,設(shè)計(jì)值,L_s=50,m,50.000,上升管總長度,結(jié)構(gòu)設(shè)計(jì),從下集箱到上集箱

19,下降管內(nèi)徑,d_i_xj,計(jì)算值,d_i_xj=d_o_xj-2×δ_xj,mm,386.000,下降管內(nèi)徑,幾何計(jì)算,d_i_xj=d_o_xj-2×δ_xj

20,下降管截面積,A_xj,計(jì)算值,A_xj=n_xj×π×(d_i_xj/1000)2/4,m2,0.702,下降管總截面積,面積計(jì)算,A_xj=n_xj×π×d_i_xj2/4

21,上升管內(nèi)徑,d_i_s,計(jì)算值,d_i_s=d_o_s-2×δ_s,mm,48.000,上升管內(nèi)徑,幾何計(jì)算,d_i_s=d_o_s-2×δ_s

22,上升管截面積,A_s,計(jì)算值,A_s=n_s×π×(d_i_s/1000)2/4,m2,2.171,上升管總截面積,面積計(jì)算,A_s=n_s×π×d_i_s2/4

23,截面比,A_xj/A_s,計(jì)算值,A_xj/A_s=A_xj/A_s,,0.323,下降管與上升管截面比,水動力設(shè)計(jì),推薦值0.2-0.4

三、水循環(huán)流量計(jì)算,,,,,,,,,

24,設(shè)計(jì)循環(huán)倍率,K_design,設(shè)計(jì)值,K_design=5.0,,5.000,設(shè)計(jì)循環(huán)倍率,T/CSEE0267,4-10范圍

25,循環(huán)流量,G,計(jì)算值,G=D×K_design,t/h,5125.000,總循環(huán)流量,流量計(jì)算,G=D×K_design

26,循環(huán)流量,G,計(jì)算值,G=G×1000/3600,kg/s,1423.611,總循環(huán)流量,單位轉(zhuǎn)換,G=D×K_design×1000/3600

27,下降管流速,w_xj,計(jì)算值,w_xj=G/(ρ'×A_xj),m/s,3.496,下降管內(nèi)水流速,流速計(jì)算,w_xj=G/(ρ'×A_xj)

28,上升管入口流速,w_s_in,計(jì)算值,w_s_in=G/(ρ'×A_s),m/s,1.130,上升管入口水流速,流速計(jì)算,w_s_in=G/(ρ'×A_s)

29,下降管質(zhì)量流速,ρw_xj,計(jì)算值,ρw_xj=G/A_xj,kg/m2·s,2027.569,下降管質(zhì)量流速,質(zhì)量流速,ρw_xj=G/A_xj

30,上升管入口質(zhì)量流速,ρw_s_in,計(jì)算值,ρw_s_in=G/A_s,kg/m2·s,655.598,上升管入口質(zhì)量流速,質(zhì)量流速,ρw_s_in=G/A_s

31,下降管流速判斷,J_w_xj,判斷值,"J_w_xj=IF(w_xj≤4.0,""滿足"",""不滿足"")",,滿足,下降管流速是否滿足,設(shè)計(jì)要求,≤4.0m/s

32,上升管流速判斷,J_w_s,判斷值,"J_w_s=IF(w_s_in≥0.4,""滿足"",""不滿足"")",,滿足,上升管流速是否滿足,設(shè)計(jì)要求,≥0.4m/s

四、汽水混合物參數(shù)計(jì)算,,,,,,,,,

33,上升管出口干度,x,計(jì)算值,x=1/K_design,,0.200,上升管出口蒸汽干度,干度計(jì)算,x=1/K

34,汽水混合物密度,ρ_h,計(jì)算值,ρ_h=1/(x/ρ''+(1-x)/ρ'),kg/m3,185.897,汽水混合物平均密度,密度計(jì)算,ρ_h=1/(x/ρ''+(1-x)/ρ')

35,截面含汽率,φ,計(jì)算值,φ=(ρ'/ρ''×x)/(ρ'/ρ''×x+(1-x)),,0.744,截面含汽率,含汽率計(jì)算,φ=(ρ'/ρ''×x)/(ρ'/ρ''×x+(1-x))

36,上升管出口流速,w_s_out,計(jì)算值,w_s_out=G/(ρ_h×A_s),m/s,3.527,上升管出口汽水混合物流速,流速計(jì)算,w_s_out=G/(ρ_h×A_s)

37,上升管出口質(zhì)量流速,ρw_s_out,計(jì)算值,ρw_s_out=G/A_s,kg/m2·s,655.598,上升管出口質(zhì)量流速,質(zhì)量流速,ρw_s_out=G/A_s

38,干度判斷,J_x,判斷值,"J_x=IF(x≤0.25,""滿足"",""不滿足"")",,滿足,干度是否滿足,設(shè)計(jì)要求,≤0.25

39,含汽率判斷,J_φ,判斷值,"J_φ=IF(φ≤0.7,""滿足"",""不滿足"")",,不滿足,含汽率是否滿足,設(shè)計(jì)要求,≤0.7

五、水循環(huán)動力計(jì)算,,,,,,,,,

40,運(yùn)動壓頭,S,計(jì)算值,S=g×H×(ρ'-ρ_h)/1000,kPa,193.307,自然循環(huán)運(yùn)動壓頭,動力計(jì)算,S=g×H×(ρ'-ρ_h)/1000

41,下降管摩擦系數(shù),λ_xj,選用值,λ_xj=0.02,,0.020,下降管摩擦系數(shù),流體力學(xué),湍流流動

42,下降管阻力,ΔP_xj,計(jì)算值,ΔP_xj=λ_xj×(L_xj/d_i_xj)×(ρ'×w_xj2)/2/1000,kPa,8.263,下降管總阻力,阻力計(jì)算,ΔP_xj=λ×(L/d)×(ρ×w2)/2

43,上升管摩擦系數(shù),λ_s,選用值,λ_s=0.025,,0.025,上升管摩擦系數(shù),流體力學(xué),兩相流

44,上升管摩擦阻力,ΔP_f_s,計(jì)算值,ΔP_f_s=λ_s×(L_s/d_i_s)×(ρ_h×w_s_out2)/2/1000,kPa,30.105,上升管摩擦阻力,阻力計(jì)算,ΔP_f=λ×(L/d)×(ρ×w2)/2

45,上升管加速阻力,ΔP_a_s,計(jì)算值,ΔP_a_s=(ρw_s_out)2×(1/ρ''-1/ρ')/1000,kPa,7.855,上升管加速阻力,阻力計(jì)算,ΔP_a=(ρw)2×(1/ρ''-1/ρ')

46,上升管重位阻力,ΔP_g_s,計(jì)算值,ΔP_g_s=g×L_s×ρ_h/1000,kPa,91.183,上升管重位阻力,阻力計(jì)算,ΔP_g=g×L×ρ

47,上升管總阻力,ΔP_s,計(jì)算值,ΔP_s=ΔP_f_s+ΔP_a_s+ΔP_g_s,kPa,129.143,上升管總阻力,阻力計(jì)算,ΔP_s=ΔP_f+ΔP_a+ΔP_g

48,有效壓頭,S_yx,計(jì)算值,S_yx=S-ΔP_xj,kPa,185.044,有效循環(huán)壓頭,動力計(jì)算,S_yx=S-ΔP_xj

49,循環(huán)安全系數(shù),K_safety,計(jì)算值,K_safety=S_yx/ΔP_s,,1.433,水循環(huán)安全系數(shù),安全校核,K_safety=S_yx/ΔP_s

50,安全系數(shù)判斷,J_K,判斷值,"J_K=IF(K_safety≥1.5,""滿足"",""不滿足"")",,不滿足,安全系數(shù)是否滿足,設(shè)計(jì)要求,≥1.5

六、汽水分層校核,,,,,,,,,

51,臨界流速,w_c,計(jì)算值,w_c=3.5×√(ρ'/ρ''-1),m/s,11.395,防止汽水分層的臨界流速,分層校核,w_c=3.5×√(ρ'/ρ''-1)

52,管子傾斜角度,θ,設(shè)計(jì)值,θ=90,度,90.000,水冷壁管傾斜角度,結(jié)構(gòu)設(shè)計(jì),垂直布置

53,實(shí)際流速,w_actual,計(jì)算值,w_actual=w_s_out,m/s,3.527,管內(nèi)實(shí)際流速,流速計(jì)算,w_actual=w_s_out

54,流速比,w_actual/w_c,計(jì)算值,w_actual/w_c=w_actual/w_c,,0.309,實(shí)際流速與臨界流速比,分層判斷,w_actual/w_c

55,分層風(fēng)險(xiǎn),risk,判斷值,"risk=IF(θ≥60,""無"",IF(w_actual≥w_c,""無"",""有""))",,無,汽水分層風(fēng)險(xiǎn),風(fēng)險(xiǎn)評估,垂直管無分層風(fēng)險(xiǎn)

56,分層校核,J_strat,判斷值,"J_strat=IF(θ≥60ORw_actual≥w_c,""滿足"",""不滿足"")",,滿足,汽水分層校核,設(shè)計(jì)要求,無分層風(fēng)險(xiǎn)

七、水循環(huán)特性曲線,,,,,,,,,

57,30%負(fù)荷循環(huán)倍率,K_30,計(jì)算值,K_30=8.0,,8.00,30%負(fù)荷時(shí)循環(huán)倍率,特性曲線,負(fù)荷降低，倍率增加

58,50%負(fù)荷循環(huán)倍率,K_50,計(jì)算值,K_50=6.5,,6.50,50%負(fù)荷時(shí)循環(huán)倍率,特性曲線,負(fù)荷降低，倍率增加

59,75%負(fù)荷循環(huán)倍率,K_75,計(jì)算值,K_75=5.5,,5.50,75%負(fù)荷時(shí)循環(huán)倍率,特性曲線,負(fù)荷降低，倍率增加

60,100%負(fù)荷循環(huán)倍率,K_100,計(jì)算值,K_100=5.0,,5.00,100%負(fù)荷時(shí)循環(huán)倍率,特性曲線,設(shè)計(jì)值

61,110%負(fù)荷循環(huán)倍率,K_110,計(jì)算值,K_110=4.5,,4.50,110%負(fù)荷時(shí)循環(huán)倍率,特性曲線,負(fù)荷增加，倍率降低

62,最低循環(huán)倍率,K_min,計(jì)算值,"K_min=M