水泥厂各种废气计算书

——————————————————————————————————————————————1目录1原料粉磨及废气处理系统物料平衡及热平衡计算…………………………22窑尾电收尘器及原料磨系统风机风量确定…………………………………63窑尾高温风机风量及风压计算…………………………………………74出C1筒窑气量验算………………………………………………………95入窑尾高温风机窑气密度计算…………………………………………106原料粉磨及废气处理系统物料平衡及热平衡计算汇总图一……………117原料粉磨及废气处理系统物料平衡及热平衡计算汇总图二……………128原料粉磨及废气处理系统物料平衡及热平衡计算汇总图三……………139原料粉磨及废气处理系统物料平衡及热平衡计算汇总图四……………1412原料粉磨及废气处理系统风管汇总表………………………………1513电收尘器进口废气露点计算…………………………………………16——————————————————————————————————————————————2原料粉磨及废气处理系统物料平衡及热平衡一.计算条件1,物料①易磨性:m0②粉磨前综合水份:Xm1=2.5%;③粉磨后综合水份:Xm2=0.5%;④粉磨前物料温度:Tm1=150C;⑤粉磨后物料温度:Tm2=850C;2,窑气①体积:VK=1.5131Nm3/Kg-clx5000x1.1x1000/24=346750Nm3/h;②烧成系统设计能力:5000t/d,放大系数:1.1;③温度:TK=3300C;④湿度:WK=70%;⑤含尘量:AK=55g/Nm3;⑥入煤磨窑气量:Vk2=52650Nm3/h(温度:Tg1=3100C);3,磨机①型号:Atox50;②原料磨系统设计能力:G0=400t/h;③要求入磨风量:Vg1=478725Nm3/h(温度:Tg1=200~3500C);4,环境①温度:Ta=150C;②湿度:Wa=50%;二,物料平衡①喂料量:Gm1=G0x100/(100-Xm1)=400x100/(100-2.5)=410.2t/h;②出磨料量:Gm2=G0x100/(100-Xm2)+VkxAk/106=400x100/(100-0.5)+346750x55/106=421.1t/h;③蒸发水量:GH2O=G0x100/(100-Xm2)x(Xm1-Xm2)/(100-Xm1)=400x100/(100-0.5)x(2.5-0.5)/(100-2.5)=8.25t/h;④入磨气体量:Vg1=478725Nm3/h;⑤出磨气体量:Vg2=Vg1+VH2O+Vs+Vf=1.05(Vg1+VH2O+Vs)=1.05(478725+1.25x8.25x1000+3000)=516639Nm3/h;三,热平衡①入磨处需热量:Qg1=Qm+QH2O+Qg2+Qd-Qgr物料温升吸热:Qm=Gm1xCmx(Tm2-Tm1)=410.2x0.932x(85-15)x1000=26761448kj/h蒸发水份吸热:QH2O=1000GH2O[(100-Tm1)x4.187+2257-(100-Tg2)x1.868]=1000x8.25x[(100-15)x4.187+2257-(100-95)x1.868]=21171109kj/h——————————————————————————————————————————————3出磨气体热焓:Qg2=Vg2xCg2xTg2=516639x1.34x95=65768145kj/h粉磨过程产生热量:Qgr=3600x0.9x(G0xP0+Ps)=3600x0.9x(400x8.72+160)=11819520kj/h表面散热:Qd按其余各项5%计;故:Qg1=1.05x(26761448+21171109+65768145-11819520)=1.06975x108kj/h②窑气热焓:QK=Vk(Ck+AkxCm/1000)xTk=346750(1.45+55x0.932/1000)x310=1.61374x108kj/h③入煤磨窑气热焓:QK2=Vk2(Ck+AkxCm/1000)xTk=52650(1.45+55x0.932/1000)x310=0.24482x108kj/h四,讨论:情形1,窑开.原料磨开.煤磨开Qg1+QK2=1.06975x108+0.24482x108=1.31457x108kj/hQK=1.61374x108kj/hVg1+Vk2=478725+52650=531375Nm3/hVk=346750Nm3/h即:窑气的热焓大于原料磨及煤磨烘干原燃料所需热焓,而窑气量却小于入磨所需风量;故原料磨进风口须掺冷风或掺循环风,为了让尽可能多的窑气入原料磨,其进风口只掺冷风而不掺循环风,以减少进增湿塔的废气处理量,从而减小电收尘器及原料磨系统风机的规格.设掺冷风Va后,入原料磨的窑气量为Vk1;QK1+Qa=1.06975x108kj/hCkxVk1xTk+CaxVaxTa=1.06975x108Vk1+Va=478725即:1.48xVk1x310+1.295x(478725-Vk1)x15=1.06975x108得:Vk1=2.22306x105Nm3/hVa=(4.78725-2.22306)x105=2.56419x105Nm3/h这种情况下,进增湿塔的窑气处理量为:Vk3=346750-(2.22306x105+52650)=71794Nm3/h进增湿塔的窑气从3100C降到1500C需喷水量GH2O(T)1000xGH2O(T)x[(100-15)x4.187+2257]=71794x1.48x(310-150)GH2O(T)=17000819/2612895=6.51t/h蒸气量:VH2O(T)=1.25x1000x6.51=8133Nm3/h出增湿塔的废气量为:VT=1.05(Vk3+VH2O(T))=1.05x(71794+8133)=83923Nm3/h进电收尘器的废气量为:VEP=Vg2+VT=516639+83923=600562Nm3/h进电收尘器的废气温度为:TEP=(516639x95+83923x150)/625814=98.50C进电收尘器进口负压为:-10000Pa则进电收尘器的废气量为:VEP=600562x(273+98.5)/273x101325/(101325-10000)=600562x1.36x1.109=905791m3/h★为了进一步减小电收尘器及原料磨系统风机的规格,除进煤磨的烟气外全部入原料磨则原料磨內喷水量GH2O(m).入磨窑气量:Vk1=346750-52650=294100Nm3/h掺入冷风量:Va=478725-294100=184625Nm3/h入磨气体热焓:CkxVk1xTk+CaxVaxTa=1.48x294100x310+1.295x184625x15=1.38519x108kj/h磨内喷水所需吸收热焓:(1.38519-1.06975)x108kj/h=31544420则原料磨內喷水量GH2O(m)=QH2O/{1000x[(100-15)x4.187+2257]}——————————————————————————————————————————————4=31544420/1000/2613=12.072t/h进电收尘器的废气量为:V’EP=V’g2=(516639+12.072x1250)=531729Nm3/h进电收尘器的废气温度为:T’EP=950C进电收尘器进口负压为:-10000Pa则进电收尘器的废气量为:V’EP=531729x(273+95)/273x101325/(101325-10000)=531729x1.348x1.109=794899m3/h情形2,窑开.原料磨开.煤磨停Qg1+QK2=1.14453x108+0=1.14453x108kj/hQK=1.61374x108kj/hVg1+Vk2=414420+0=414420Nm3/hVk=346750Nm3/h即:窑气的热焓大于原料磨原料所需热焓,而窑气量却小于入磨所需风量;故原料磨进风口须掺冷风或掺循环风,为了让尽可能多的窑气入原料磨,其进风口只掺冷风而不掺循环风,以减少进增湿塔的废气处理量,从而减小电收尘器及原料磨系统风机的规格.QK1+Qa=1.06975x108kj/hCkxVk1xTk+CaxVaxTa=1.06975x108Vk1+Va=478725即:1.48xVk1x310+1.295x(478725-Vk1)x15=1.06975x108得:Vk1=2.22306x105Nm3/hVa=(4.78725-2.22306)x105=2.56419x105Nm3/h这种情况下,进增湿塔的窑气处理量为:Vk3=346750-2.22306x105=124444Nm3/h进增湿塔的窑气从3100C降到1500C需喷水量GH2O(T)1000xGH2O(T)x[(100-15)x4.187+2257]=124444x1.48x(310-150)GH2O(T)=29468339/2612895=11.28t/h蒸气量:VH2O(T)=1.25x1000x11.28=14100Nm3/h出增湿塔的废气量为:VT=1.05(Vk3+VH2O(T))=1.05x(124444+14100)=145471Nm3/h进电收尘器的废气量为:VEP=Vg2+VT=516639+145471=662110Nm3/h进电收尘器的废气温度为:TEP=(516639x95+145471x150)/662110=107.10C进电收尘器进口负压为:-10000Pa则进电收尘器的废气量为:VEP=662110x(273+107.1)/273x101325/(101325-10000)=662110x1.392x1.109=1022118m3/h★为了进一步减小电收尘器及原料磨系统风机的规格,除进煤磨的烟气外全部入原料磨则原料磨內喷水量GH2O(m).入磨窑气量:Vk1=346750Nm3/h掺入冷风量:Va=478725-346750=131975Nm3/h入磨气体热焓:CkxVk1xTk+CaxVaxTa=1.48x346750x310+1.295x131975x15=1.61653x108kj/h磨内喷水所需吸收热焓:(1.61653-1.06975)x108kj/h=54678000kj/h则原料磨內喷水量GH2O(m)=QH2O/{1000x[(100-15)x4.187+2257]}=54678000/1000/2613=20.9t/h进电收尘器的废气量为:V’EP=V’g2=(516639+20.9x1250)=542764Nm3/h进电收尘器的废气温度为:T’EP=950C进电收尘器进口负压为:-10000Pa根据原料磨的最新资料，其磨内的最大喷水量为17t/h,——————————————————————————————————————————————5磨内喷水所吸收热焓:QH2O=GH2O(m){1000x[(100-15)x4.187+2257]}=17{1000x[(100-15)x4.187+2257]}=6088584kj/h则原料磨入口需热量:Q’g1=1.06975x108+0.06088584x108=1.13063584x108kj/hCkxVk1xTk+CaxVaxTa=1.13063584x108Vk1+Va=478725即:1.48xV’k1x310+1.295x(478725-V’k1)x15=1.13063584x108得:V’k1=2.36164x105Nm3/hV’a=(4.78725-2.36164)x105=2.42561x105Nm3/h这种情况下,进增湿塔的窑气处理量为:V’k3=346750-(2.42561x105+52650)=51539Nm3/h进增湿塔的