年产85万吨焦化厂终冷洗苯工段工艺计算.docx

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1、洗苯、脱苯工段工艺计算进本工段物料参数年产85万吨焦化厂，煤气产率：11.7%，全焦率：78.00%，一年按365天，一天24小时煤气中杂质组成（煤气的分子量为10.4）H32S0.02g/Nm煤气NH330.03g/Nm煤气HCN0.3g/Nm3煤气苯28.45g/Nm3煤气萘0.4g/Nm3煤气焦油微量g/Nm3煤气85×107×11.7%41.煤气质量产量G==1.46×10kg/h煤气78%×365×241.45×10743煤气体积流量V==3.24×10m/h煤气0.45煤气密度ρ=0.45kg/m32.煤气中粗苯质量流量G=3.24×104×28.45×10−3=921.78kg

2、/h苯921.783煤气中粗苯体积流量V==251.37Nm/h苯3.6673粗苯的密度ρ萘＝3.667kg/Nm3.煤气中萘质量流量G=3.24×104×0.4×10−3=12.96kg/h萘12。963煤气中萘体积流量V==11.15Nm/h苯1.1623萘的密度ρ萘＝1.162kg/Nm4.煤气中HS质量流量G=3.24×104×0.02×10−3=0.65kg/h2H2S0.653煤气中H2S体积流量VH2S==0.43Nm/h1.5183H2S密度ρH2S＝1.518kg/Nm5.煤气中NH质量流量G=3.24×104×0.03×10−3=0.97kg/h3NH30.973煤气中N

3、H3体积流量VNH3==1.37Nm/h0.708NH3的密度ρNH3＝0.708kg/Nm36.煤气中HCN质量流量G=3.24×104×0.3×10−3=9.72kg/hHCN9.723煤气中HCN体积流量VHCN==10.45Nm/h0.933HCN的密度ρHCN＝0.93kg/Nm故煤气组成为：33组成g/Nm煤气分子量kg/hNm/h煤气10.41450032400H2S0.02340.650.43NH30.03170.971.37HCN0.3279.7210.45苯28.4582.2（平均）921.78251.37萘0.412812.9611.15焦油微量160总计15446.0

4、832674.77终冷塔一、物料衡算终冷塔塔前煤气中水蒸气体积流量煤气露点40℃下，水的饱和蒸汽压P40=752.08mmH2O煤气入终冷塔压力P人=1200mmH2O（表压）P40752.3V=V×=32674.77×=2390.95Nm/h塔前水蒸气混合煤气P入+9830−P40+9830−752.08质量流量1818G=V×=2390.95×=1921.30kg/h塔前水蒸气塔前水蒸气22.422.4出终冷塔一段的水蒸气体积流量35℃下水的饱和蒸汽压P35=573.44mmH2O煤气压力（表压）1200mmH2OP40573.3V=V×=32674.77×=1791.89Nm/h一段水

5、蒸气混合煤气P入+9830−P40+9830−573.44质量流量1818G=V×=1791.89×=1439.91kg/h一段水蒸气一段水蒸气22.422.4出终冷塔二段的水蒸气体积流量25℃下水的饱和蒸汽压P25=323.02mmH2O煤气压力（表压）1200mmH2OP25323.3V=V×=32674.77×=985.77Nm/h塔后水蒸气混合煤气P出+10333−P25+9830−323.02质量流量1818G=V×=985.77×=792.14kg/h塔后水蒸气塔后水蒸气22.422.4进入终冷塔荒煤气的物料组成：33组成g/Nm煤气kg/hNm/h煤气1450032400苯28

6、.45921.78251.37H2S0.020.650.43NH30.030.971.37HCN0.39.7210.45萘0.412.9611.15焦油微量水蒸气1921.302390.95总计17367.3835065.72出终冷塔一段荒煤气物料组成33组成g/Nm煤气kg/hNm/h煤气1450032400苯28.45921.78251.37H2S0.020.650.43NH30.030.971.37HCN0.39.7210.45萘0.412.9611.15焦油微量水蒸气1439.911791.89总计16885.9934466。66出终冷塔二段荒煤气物料组成33组成g/Nm煤气kg/h

7、Nm/h煤气1450032400苯28.45921.78251.37H2S0.020.650.43NH30.030.971.37HCN0.39.7210.45萘0.412.9611.15焦油微量水蒸气792.14985.77总计16238.2233660.54二、热量衡算1.入终冷塔物料带入热量1)粗气带入热量：粗气比热0.73kcal/(kg·℃)Q11=14600×0.73×55=kcal/h2)水蒸气带