简捷法确定提纯回用氢网络目标值

与只考虑直接回用的氢网络相比,具有提纯单元的氢网络能显著减少新鲜氢气的消耗量,但其设计及求解提纯目标值过程均更为复杂。对于单杂质、提纯单元采用固定浓度模型的提纯回用氢网络,结合此类网络的特点,提出了一种简捷法确定网络目标值。首先假设提纯后氢物流量足够大,由此得出初始提纯夹点。当初始夹点估算正确时,由夹点之下的需求物流和源物流的流量与杂质质量衡算即可得出提纯回用氢网络的目标值;当初始夹点估算不正确时,可以第一次计算结果为基础判断得出正确夹点,再增加一步简单计算,也可得到提纯回用目标值。计算实例表明本文方法计算简单且有效。

A simple method for targeting hydrogen networks with purification unit

Hydrogen utility consumption can be reduced significantly when purification unit is introduced in a hydrogen network. In general, design and targeting of the hydrogen network involving purification are more difficult compared to that of the network involving reuse only. In this paper, a simple method is presented for targeting the single contaminant hydrogen networks involving purification unit with fixed purified concentration model, based on the characteristics of the hydrogen networks. In the targeting procedure, the initial flow rate of the purified stream is first assumed as sufficient, and then the initial purification pinch is identified. Finally, the purification target can be obtained with a few relationships developed from material balances. If the initial purification pinch is estimated correctly, the purification target can be obtained by only one step simple calculation. If the initial purification pinch is not estimated correctly, the correct pinch point can be determined based on the results of the first step calculation. The target can be obtained by an additional step of simple calculation. The results of a few literature examples show that the purification stream consumption target of single-contaminant hydrogen networks involving purification unit can be obtained easily with the proposed method, which provides an effective tool for the targeting of hydrogen networks involving purification unit.