杭州承运环保工程有限公司
已认?/p>
一、设计基本参数:
(1)电石炉炉气含尘量9/span>
每台炉炉气量9/span>3750m3/h,炉气中含尘浓度9/span>50~150g/ m3,换算成含尘量是9/span>187.5~562.5kg/h
(2)电石炉炉气中粉尘的化学成分:
粉尘种类 |
CaO |
C |
SiO3 |
Fe2O3 |
Al2O3 |
其它 |
百分毓/span> |
37.2 |
34.1 |
15.8 |
0.96 |
7.1 |
4.84 |
真实比重 |
2.8 |
1.9 |
2.35 |
5.18 |
3.96 |
粉尘的加权真实比重为2.48:/span>
粉尘的堆积比重数据缺少,类比相似物料,推定为0.6、/span>
(3)电石炉炉气中粉尘的粒径分布:
粒径(微米) |
0~2 |
2~5 |
5~10 |
10~20 |
20~40 |
40~ |
百分毓/span> |
37.5 |
19.6 |
21.8 |
15.6 |
4.1 |
1.4 |
粉尘的加权平均粒径为7微米、/span>
(4)布袋除尘器气力输灰系统:
a、每两台炉共?/span>1台布袋除尘器+/span>1台布袋除尘器收集的粉尘量是:375~1125kg/h:/span>
b、十台炉对应5台布袋除尘器+/span>5台布袋除尘器收集的粉尘总量是:1875~5625kg/h:/span>
c、布袋除尘器排灰温度9/span>£220℃;
d、每台布袋除尘器有一个卸料口,每台布袋除尘器下设?/span>1台仓泵,仓泵容积0.5m3+/span>5个仓泵同时输送,合用一核/span>管道输送、/span>
e、气力输灰系统的设计输送量是:6000kg/h、/span>
(5)灰库
设置1座灰库,灰库距布袋除尘器最远水平距离为(配管长度):约为1000m,垂直高?/span>:约为20m+/span>90℃弯头约丹/span>15个、/span>
二?/span>计算过程
1?/span>5台仓泵每次输送灰量为m=VC*qu*K1*γh=0.5*5*0.8*600=1200 kg
2?/span>设计输送量丹/span>6000kg/h,每小时需输?/span>5次,每次输送循环时间为12分钟,经验得出包括管道吹扫、仓泵进料、加压流化、阀门动作等在内的输送辅助时间为2分钟,则每次输送循环中用于输送的时间?/span>10分钟,管道的出力应是7200kg/h、/span>
3?/span>根据经验设定粉尘与输送氮气的固气比υ/span>=8、/span>
4?/span>输送气量为9/span>ma=mS/φ=7200/8=900 kg/h=15 kg/min
Qa=ma/γa=15/1.2=12.5 Nm3/min
5?/span>Qa=mS/(υ/span>*γa(/span>=7200/(8*1.2)=750 Nm3/h=12.5 Nm3/min
6?/span>粉尘与输送氮气在输送过程中的热交换及热平衡后的空气温度9/span>
粉尘进入输送管道时的温度假定为220℃,压缩氮气的温度假定为30℃,平衡温度丹/span>T,粉尘流量为7200kg/h,氮气流量为900kg/h,粉尘加权比?/span>890J/kg K,氮气比?/span>1038J/kg K,由下面的换热等弎/span>
7200×890×'/span>220,/span>T(/span>=900×1038×'/span>T,/span>30(/span>
得:T=196ℂ/span>
7?/span>输送过程中的降温:
管道、设备与环境的热交换及热辐射降温很难计算,根据火力电厂输灰的经验,混合物温度与环境温度的温差越大,每100m管道降温越大。根据经验,环境温度25℃,输送管道出口处温度约为65℃、/span>
8?/span>根据上述数据及经验,确定输送管道为Ø108x5/ Ø133x5,假定前殴/span>Ø108x5管道镾/span>660米(其中水平650米,垂直10米,90℃弯夳/span>8?/span>),后段Ø133x5管道镾/span>360米(其中水平350米,垂直10米,90℃弯夳/span>7?/span>)、/span>
9?/span>计算Ø133x5管道的压降:
根据经验,管道入口处氮气温度?/span>90℃,出口处温?/span>65℃,出口处压力取3kPa'/span>g)。根据稳定输送压降公式△Pm='/span>Pe2+Pe*'/span>1+φ*k(/span>*λa*'/span>Leq/D(/span>*γae*νe2(/span>0.5- Pe='/span>1043002+104300*'/span>1+8*0.75(/span>*0.028*'/span>440/0.123(/span>*1.07*19.72(/span>0.5- 104300=98654 Pa=99 kPa
10?/span>校核Ø133x5管道入口处速度丹/span>(12.5/'/span>60*0.785*0.123*0.123(/span>)*'/span>101/'/span>101+99))*((273+90(/span>/273(/span>=11.8m/s
11?/span>计算Ø108x5管道的压降:
管道入口处氮气温度约50℃(在离入口20m处升?/span>195℃),出口处温度90℃,出口处压力为99kPa'/span>g)。根据稳定输送压降公式△Pm='/span>Pe2+Pe*'/span>1+φ*k(/span>*λa*'/span>Leq/D(/span>*γae*νe2(/span>0.5- Pe='/span>2000002+200000*'/span>1+8*0.75(/span>*0.03*'/span>774/0.098(/span>*1.92*17.32(/span>0.5- 200000=274346 Pa=274 kPa
12?/span>校核Ø108x5管道入口处速度丹/span>(12.5/'/span>60*0.785*0.098*0.098(/span>)*'/span>101/'/span>101+99+274))*((273+50(/span>/273(/span>=7.0m/s
13?/span>输送管道总压降为9/span>99+274=373 kPa
三?/span>输送参数汇怺/span>
1?/span>设计输送量6000t/h,实际管道出劚/span>7200kg/h、/span>
2?/span>设计输送管遒/span>Ø108x5/ Ø133x5'/span>660m/360m),其中水平管道总长1000m,垂直管遒/span>20m,包?/span>90℃弯夳/span>15个、/span>
3?/span>输送管道总压陌/span>373kPa,要求气源压力大亍/span>600kPa'/span>g)、/span>
4?/span>稳定输送期间的输送气野/span>12.5 Nm3/min,全周期输送气野/span>10.4 Nm3/min,要求气源气量不低于11.5 Nm3/min、/span>
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