化工原理1-7章习题答案.doc

化工原理1-7章****题答案
目录
第一章流体流动与输送机械·····················································(2)
第二章非均相物系分离·························································(32)
第三章传热···································································(42)
第四章蒸发···································································(69)
第五章气体吸收·······························································(73)
第六章蒸馏···································································(
95)
第七章固体干燥·······························································(119) 1
第一章流体流动与输送机械
1. 某烟道气的组成为CO2 13%,N2 76%,H2O 11%(体积%),试求此混合气体在温度500℃、。
解:混合气体平均摩尔质量
Mm??yiMi?(?44??28??18)?10?3??10?3kg/mo l
∴混合密度
?103??10?3
?? ρm??(273?500)
℃时苯和甲苯的密度分别为879 kg/m3和867 kg/m3,试计算含苯40%及甲苯60%(质量%)的混合液密度。
解: 1
?m?a1?1?a2?2? ?879867
3 混合液密度ρm?
,一操作中的吸收塔塔内表压为130kPa。若在大气压力为75 kPa的高原地区操作该吸收塔,且保持塔内绝压相同,则此时表压应为多少?
解:p绝?pa?p表?pa+p表''
''(+130)?75? ?p表?(pa+p真)-pa?
,密闭容器中存有密度为900 kg/m3的液体。容
器上方的压力表读数为42kPa,又在液面下装一压力表,表中心线在
,其读数为58 kPa。试计算液面到下方测压口的距
离。
解:液面下测压口处压力
p?p0??g?z?p1??gh 题4 附图
2
p1??gh?p0p1?p0(58?42)?103
??z???h??? ?g?g900?
5. 如附图所示,敞口容器内盛有不互溶的油和水,油层和水层的厚度分
别为700mm和600mm。在容器底部开孔与玻璃管相连。已知油与水的密度分
别为800 kg/m3和1000 kg