合成氨全低变工艺换热网络优化设计

为探讨合成氨变换工段进一步降低能耗的可能性 ,在某厂年产 8万吨合成氨全低变工艺流程的基础上 ,根据小合成氨厂工艺技术与设计手册 ,重新对变换工段的冷热物流进行了计算 ,由计算结果作出冷热物流组合曲线 ,利用夹点技术对换热网络进行优化综合 ,通过改变物流匹配的流量和流动路线等 ,设计出了一种新全低变换热网络 .该网络在满足全低变工艺要求的前提下 ,能充分利用系统自身的热量 ,不需要外供蒸汽 ;与第二换热网络相比 ,减少了设备数量和投资 ;与现有流程相比 ,变化不大 ,具有节能应用前景 .

Optimum Design of Overall Low Temperature Shift Conversion Heat Exchanger Network in Ammonia Production

In order to inquiry into the possibility of further energy saving on overall low temperature shift conversion technology,in this paper,according to the technology and design handbook about small ammonia factory,the cold and hot stream data is calculated on the basis of annual output 8 ten thousands ton ammonia overall low temperature shift conversion technology in a certain factory. The combination curves of cold and hot stream are made according to calculation result. The Heat Exchanger Network (HEN) of overall low temperature shift conversion is optimized by pinch point technology. A new HEN is arrived by changing flow and flow route of stream match.The new HEN can fully utilize its own system heat under these circumstances to meet the demands of overall low temperature shift conversion technology.It does not need external steam.Copared with the second HEN, the new HEN can reduce equipment number and cost.Compared with the present overall low temperature shift conversion process,there is no bigger change. It has useful prospect for saving energy.