Pinch analysis for the hydrogen network with the concentration of fresh hydrogen considered

doi:10.16085/j.issn.1000-6613.2017.03.016

Abstract

Abstract:

Based on the pinch method,the hydrogen network is integrated with the concentration of fresh hydrogen considered. Aspen Plus software is used to simulate the hydrogen production process of nature gas steam reforming producing fresh hydrogen with different concentrations. The simulation results are used to conduct the energy consumption analysis,and calculate the total cost including the raw material gas,oxygen water,cooling water,by-product of steam,pressure swing adsorption, compressor electric costs. The production cost increases as the fresh hydrogen concentration increases, and the quantitative relationship between them is determined. In the case study,the hydrogen network of a petrochemical enterprise is optimized using that relationship. Considering different hydrogen source conditions,the conserved cost versus concentration and total cost versus concentration diagrams are plotted,and the trend of hydrogen pinch is depicted. With the requirement of the hydrogen network satisfied,the conserved cost increases as the fresh hydrogen concentration increases,while the total cost decreases. It is concluded that the fresh hydrogen with high purity can benefit the energy saving in the hydrogen network design.

Key words: hydrogen network, concentration of fresh hydrogen, hydrogen production process simulation, optimization

摘要：

基于夹点法，对考虑新氢纯度的氢网络集成进行了研究。利用Aspen Plus建立了天然气蒸气转化制氢过程的模拟模型。在考虑原料气、除氧水、冷却水、副产蒸气、变压吸附、压缩机用电等主要能耗的前提下，计算出系统总费用，对整个过程进行了能耗分析。通过改变产氢摩尔分数，得到相应的单位产氢量费用，进一步拟合出了新氢生产成本随产氢摩尔分数变化的定量关系式。在此基础上，对某炼厂的氢网络案例进行优化，作出不同氢源线下的节氢费用-新氢摩尔分数关系图、新氢消耗费用-新氢摩尔分数图。通过分析夹点位置随新氢摩尔分数改变的变化趋势可知，在满足氢网络要求下，节省费用随新氢摩尔分数的增大而增大，新氢消耗费用随摩尔分数的增大而减少。因此，在该氢网络中，高纯度的新氢有利于系统节能。

关键词: 氢网络, 新氢摩尔分数, 制氢模拟, 优化

CLC Number:

TQ021.8

LIANG Jingjing, LIU Guilian. Pinch analysis for the hydrogen network with the concentration of fresh hydrogen considered[J]. Chemical Industry and Engineering Progress, 2017, 36(03): 887-892.

梁靖靖, 刘桂莲. 考虑新氢纯度的氢网络夹点分析[J]. 化工进展, 2017, 36(03): 887-892.

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