61若煤质分析表中列出如下成分Cu=386%、日=26%S天38 %、Na=0.8%Oa=3,1%M=11.0%A=40.1%而工业分析表 明,实际水分M=16%,试求实际燃料的收到基成分及发热量? 解:1kg空气干燥基燃料折合成实际燃料收到基 1-M 0.16 FO FO 011×386%=364% 1-A1-0.16 ×40.1%=37.8% 1-0.11 1-M 1-0.16 ×26%=2.5% 1-M 1-0.16 ×3.8%=3.6% 1-M 1-0.16 N ×0.8%=0.8% 1-0.11 1-0.16 O 1-M 1-01×3.1%=2.9%
1 6-1 若煤质分析表中列出如下成分FCad＝38.6％、Had＝2.6％、Sad＝3.8 ％、Nad＝0.8％、Oad＝3.1％、Mad＝11.0％、Aad＝40.1％, 而工业分析表 明，实际水分Mar＝16％，试求实际燃料的收到基成分及发热量? 解：1kg空气干燥基燃料折合成实际燃料收到基 1 1 0.16 38.6% 36.4% 1 1 0.11 ar ar ad ad M FC FC M − − = = = − − 1 1 0.16 40.1% 37.8% 1 1 0.11 ar ar ad ad M A A M − − = = = − − 1 1 0.16 3.8% 3.6% 1 1 0.11 ar ar ad ad M S S M − − = = = − − 1 1 0.16 0.8% 0.8% 1 1 0.11 ar ar ad ad M N N M − − = = = − − 1 1 0.16 3.1% 2.9% 1 1 0.11 ar ar ad ad M O O M − − = = = − − 1 1 0.16 2.6% 2.5% 1 1 0.11 ar ar ad ad M H H M − − = = = − −
1-(FCar +Aar +Ha+Sar+Nar +Oar) =1-(0364+0.378+0.025+0.036+0008+0029)=16.0% 收到基(ar) 空干基(ad) 干燥基(d 干燥无灰基(f) C N SbM M 灰分 水分 挥发那分 焦灰
2 ( ) ( ) 1 1 0.364 0.378 0.025 0.036 0.008 0.029 16.0% M FC A H S N O ar ar ar ar ar ar ar = − + + + + + = − + + + + + =
(2)计算煤的发热量 a)无烟煤: Qm,=K0-360010-385004-1000 35797 2.6%=53% daf_aod 0.11-0.401 0.11-0401 (26%+38%+08%+31%)=211% Ka=35588 d=d-0.xA=Va-0.1×Ax 1-M 21.1%-0.1×401%X1 166% -11.0% Qna=K0-360-38500A-1000 =355853600106038500×378%-1000×090=16045(k/kg) Qnya=K0-36000Ma-38500Aa-10000 35797-3600109-38500×378%-10003%=16254(/kg)
3 (2)计算煤的发热量 , , 0 36000 38500 10000 Q K M A V net v ad ad ad ad = − − − a)无烟煤： 1 1 2.6% 5.3% 1 1 0.11 0.401 daf ad ad ad H H M A = = = − − − − ( ) 1 1 2.6% 3.8% 0.8% 3.1% 21.1% 1 1 0.11 0.401 daf ad ad ad V V M A = = + + + = − − − − 1 0.1 0.1 1 1 21.1% 0.1 40.1% 16.6% 1 11.0% daf daf d daf ad ad V V A V A M = − = − − = − = − ① 0 K = 35588 0 K = 35797 ( ) , , 0 36000 38500 10000 35588 36000 11.0% 38500 37.8% 10000 10.3% 16045 / Q K M A V net v ad ad ad ad kJ kg = − − − = − − − = ( ) , , 0 36000 38500 10000 35797 36000 11.0% 38500 37.8% 10000 10.3% 16254 / Q K M A V net v ad ad ad ad kJ kg = − − − = − − − =
b)烟煤: Cnet, vad 100K1-(100K1+2510Ma+Aa)-1260a-16750Ma d21.1%<35% 且 Mn=11.0%>3% 焦炭特性取4级,查表K1=348 Qna=100×348-(100×348+2510(1109%+40.190)-1260×10.3%-16750×11090 =13762(k/g) 4
4 b) 烟煤： Qnet v a d K K M a d Aa d 1260Va d 16750M a d 100 (100 2510)( ) , , = 1 − 1 + + − − Vdaf = 21.1% 35% Mad = 11.0% 3% 焦炭特性取4级，查表 1 K = 348 ( ) , , 100 348 (100 348 2510)(11.0% 40.1%) 1260 10.3% 16750 11.0% 13762 / Qnet v ad kJ kg = − + + − − = 且
6-4已知某窑炉用煤的收到基组成为: 组分 Car ar sar Mar Aar 质量(%) 75.0 6.8 5.0 12 3.5 8.0 a=12,计算:①实际空气量(Nm3kg);②实际烟气量(Nmy kg);③烟气组成。 解:基准:1kg煤。 (1)空气量计算 理论空气量V0: 100(CH 21 124 3232八×224100 0.750.0680.0050.05 100 ×22.4x 12 4 3232 21 83(Nm7/g) 实际空气量V: Va=c0=12×833=10(Wm/kg)
5 6-4 已知某窑炉用煤的收到基组成为： α=1.2，计算：①实际空气量（Nm3 /kg）；②实际烟气量（Nm3 / kg）；③烟气组成。 组分 Car Har Oar Nar Sar Mar Aar 质量（%） 75.0 6.8 5.0 1.2 0.5 3.5 8.0 解：基准：1kg煤。 (1)空气量计算 理论空气量Va 0： ( ) 2 0 0 3 100 100 22.4 21 12 4 32 32 21 0.75 0.068 0.005 0.05 100 22.4 12 4 32 32 21 8.33 ar ar ar ar a o C H S O V V Nm kg = = + + − = + + − = 实际空气量Va： ( ) 0 3 1.2 8.33 10.00 V V Nm kg a a = = =