Impurity-deficit based graphical method for integrating water network with regeneration reuse

doi:10.16085/j.issn.1000-6613.2018-1318

Abstract

Abstract:

The hydrogen network integration and optimization method was extended to the water network, based on hydrogen surplus and the conceptual integration method. Through analyzing impurity concentration, an impurity deficit graphical integration and optimization method was proposed for water network with regeneration reuse, which did not require trial and iteration. For the water network without regeneration reuse, the position of the pinch point and the minimum fresh water could be identified by constructing concentration-flowrate diagram and impurity deficit diagram. Furthermore, for the water network with regeneration, the relation between the fresh water consumption saving and impurity removal rate, regenerated water flowrate and concentration was deduced. The diagram was developed to identify the variation of fresh water consumption along these parameters, the location of the pinch point, the maximum fresh water savings, the limiting and the optimal regeneration parameters under a certain conditions. Case study shows that this method is simple and efficient, and can be applied to reduce fresh water consumption and wastewater discharge for different operating conditions, as well as provide important reference for process design and operation.

Key words: water network, impurity deficit, pinch point, regeneration, optimization, integration

摘要：

将氢网络中基于剩余率的集成优化法扩展至水网络，以杂质浓度为基础进行分析，提出了基于杂质赤字的再生回用水网络图像集成优化方法。该方法无需图像试差和迭代，通过构建浓度-流量图和杂质赤字图，可确定未考虑再生回用的水网络夹点位置及最小新鲜水用量。并在此基础上，考虑再生装置和水网络的优化以及二者的集成，分析水网络的新鲜水节省量与杂质脱除率、再生水源流量及再生废水浓度的定量关系；构建定量关系图确定最小新鲜水用量随各参数的变化关系、夹点位置、最大新鲜水节省量以及一定再生条件下的极限及最优提纯参数。案例分析表明，该方法简单、高效，对于各工况下的水网络，均可使新鲜水消耗量及废水排放量减小，为工艺设计和操作提供重要的参考。

关键词: 水网络, 杂质赤字, 夹点, 再生, 优化, 集成

CLC Number:

TQ021.8

LÜ Donghui, LIU Guilian. Impurity-deficit based graphical method for integrating water network with regeneration reuse[J]. Chemical Industry and Engineering Progress, 2019, 38(04): 1671-1680.

吕东晖, 刘桂莲. 基于杂质赤字的再生回用水网络集成图示法[J]. 化工进展, 2019, 38(04): 1671-1680.

Figures/Tables 18

References 28

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流股	流量f/ t·h^-1	b _in,max/mg·t^-1	b _out,max/mg·t^-1
1	120	0	100
2	80	50	140
3	80	50	-
4	140	140	180
5	80	170	230
6	195	240	250

流股	流量f/ t·h^-1	b _in,max/mg·t^-1	b _out,max/mg·t^-1
1	120	0	100
2	80	50	140
3	80	50	-
4	140	140	180
5	80	170	230
6	195	240	250

水源	浓度/mg·t^-1	流量/t·h^-1	水阱	浓度/mg·t^-1	流量/t·h^-1
SR₀	0	250	SK₁	0	120
SR₁	100	120	SK₂	50	80
SR₂	140	80	SK₃	50	80
SR₃	180	140	SK₄	140	140
SR₄	230	80	SK₅	170	80
SR₅	250	195	SK₆	240	195

水源	浓度/mg·t^-1	流量/t·h^-1	水阱	浓度/mg·t^-1	流量/t·h^-1
SR₀	0	250	SK₁	0	120
SR₁	100	120	SK₂	50	80
SR₂	140	80	SK₃	50	80
SR₃	180	140	SK₄	140	140
SR₄	230	80	SK₅	170	80
SR₅	250	195	SK₆	240	195

b _g	——	再生产品的浓度，mg/t
b_i	——	任一指定水源的浓度，mg/t
b_i ^*	——	与水阱连接线i相交的水源的杂质浓度，mg/t
b _in,max	——	水阱最大进口杂质浓度，mg/t
b _out,max	——	水阱最大出口杂质浓度，mg/t
b _pin ^*	——	再生后为新夹点杂质浓度，mg/t
b _pur	——	再生水源的浓度，mg/t
b _pur0	——	再生水源之下的水源位置发生跃迁时的再生水源浓度，mg/t
b _pur,lim	——	极限再生水源浓度，mg/t
b _pur,opt	——	最优再生水源浓度，mg/t
b _u	——	新鲜水源杂质浓度，mg/t
b _w	——	再生废水杂质浓度，mg/t
b _w0	——	再生水源之下的水源位置发生跃迁时的再生废水浓度，mg/t
b _w,lim	——	极限再生废水浓度，mg/L
c _g	——	提纯产品的氢的摩尔分数，%
c_i ^*	——	与水阱连接线i相交的氢源摩尔分数，%
c _pin ^*	——	提纯后为新夹点的氢源摩尔分数，%
c _pur	——	提纯氢源的摩尔分数，%
c _u	——	氢公用工程摩尔分数，%
F _pur	——	提纯氢源流量，mol/s
f	——	水源或水阱的流量，t/h
f _g	——	再生产品的流量，t/h
f _pur	——	再生水源的流量，t/h
f _pur,lim	——	极限再生水源的流量，t/h
f _pur,opt	——	最优再生水源的流量，t/h
f _u ⁰	——	为初始状态时的新鲜水量，t/h
f _u ^′	——	夹点出现时水网络的新鲜水消耗量，t/h
f _w	——	再生废水的流量，t/h
H_i	——	氢阱连接线i处的累积剩余氢量，mol/s
h_i	——	水阱连接线i累积杂质赤字，mg/h
R	——	纯氢收率
r	——	杂质脱除率
r ₀	——	再生水源之下的水源位置发生跃迁时的杂质脱除率
r _lim,max	——	最大杂质脱除率
r _lim,min	——	最小杂质脱除率
r _opt	——	最优杂质脱除率
SK _j	——	水阱j
SR _i	——	水源i
?F _u _,i	——	未考虑提纯的氢网络中某氢阱连接线的公用工程迁量，mol/s
?F _u ^*	——	未考虑提纯的氢网络确保夹点形成的公用工程迁量，mol/s
?_s F _u, _i	——	提纯后的公用工程节省量，mol/s
?f _u, _i	——	未考虑再生的水网络中某水阱连接线的新鲜水迁量，t/h
?f _u ^*	——	未考虑再生的水网络确保夹点形成的新鲜水迁量，t/h
?_s f _u _,i	——	考虑再生的水网络某水阱连接线的新鲜水节省量，t/h
?_s f _u,ma _x	——	水网络系统最大的新鲜水节省量，t/h
?_s,p f _u,max	——	再生产品之下的水源确定的最大新鲜水节省量，t/h