CIESC Journal ›› 2019, Vol. 70 ›› Issue (2): 431-439.doi: 10.11949/j.issn.0438-1157.20181145

• Process system engineering • Previous Articles     Next Articles

Inter-plant waste heat integration for industrial park using two medium fluids

Changhao WU(),Linlin LIU(),Lei ZHANG,Jian DU   

  1. Institute of Chemical Process Systems Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2018-10-08 Revised:2018-10-22 Online:2019-02-05 Published:2018-10-29
  • Contact: Linlin LIU E-mail:claude114@163.com;liulinlin@dlut.edu.cn

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Abstract:

Considering the cluster effect of industrial park, it is expectable that could improve energy efficiency of the entire park by recovering the waste heat in each single plant via inter-plant medium fluids which absorb heat in some plants and release heat into other plants. Obviously, the selection of heat exchange medium and the setting of medium heat recovery loop will highly affect the optimal design of the waste heat recovery system and the energy-saving effect. Thus, other than single medium integration strategy, this work uses both hot water and thermal oil as mediums to implement the inter-plant waste heat integration. A heat exchanger network (HEN) superstructure coupling the matches between medium fluids and inner-plant process streams and the allocation of medium streams across plants is proposed. Accordingly, a mixed-integer non-linear programming (MINLP) model is formulated for network optimization aiming at the target of minimum total annual cost. At last, an example involving three plants is studied in three synthesis cases (single medium-single loop, single medium-dual loops, and dual mediums-dual loops). The effectiveness of the proposed method was verified by comparison.

Key words: inter-plant waste heat integration, medium fluid, heat transfer, optimization, system engineering

CLC Number: 

  • TQ 021.8

Fig 1

HEN superstructure for industrial park"

Table 1

Process data of heat source plant C"

Stream F/(kW·K-1) T in /℃ T out/℃ q/kW

1

2

3

400

400

100

250

225

120

185

110

50

26000

50000

7000

Table 2

Process data of heat sink plants"

Stream F/(kW·K-1) T in /℃ T out/℃ q/kW
plant A
1 200 60 90 6000
2 200 40 100 12000
3 150 50 150 15000
4 200 50 160 22000
plant B
5 300 20 100 24000
6 600 50 70 12000
7 600 130 180 12000

Fig.2

Optimal HEN for industrial park"

Table 3

Cost results of HENs"

Item Case 1 Case 2 Case 3
cost of heat exchangers/(USD·a-1) 566873 796146 889677
hot utility /kW 42000 42000 42743.1
cold utility /kW 0 0 743.1
utility cost/(USD·a-1) 6300000 6300000 6417410
cost of piping and pumping/(USD·a-1) 460345 428479 439814
TAC of HEN/(USD·a-1) 7327217 7524625 7746901

Fig.3

Single medium-dual loops HEN for industrial park"

Fig.4

Single medium-single loop HEN for industrial park"

"

A ——过程换热器面积，m2
A hu,A cu ——分别为热、冷公用工程面积，m2
A f ——年度费用因子
B,D ——换热器面积费用系数
C hu,C cu ——分别为热、冷公用工程单位费用，USD?kW-1?a-1
CH ——换热器的固定安装费用，USD?a-1
ec(p,i) ——p厂i过程流股的热负荷，kW
ec(p,j) ——p厂j过程流股的热负荷，kW
F(p,i) ——p厂中i过程流股的热容流率，kW?K-1
F(p,j) ——p厂中j过程流股的热容流率，kW?K-1
F c(p,g) ——p厂g冷介质流股的热容流率，kW?K-1
F h(p,g) ——p厂g热介质流股的热容流率，kW?K-1
f(p,g,p') ——p厂至p'厂g介质流股热容流率，kW?K-1
f(p',g,p) ——p'厂至p厂g介质流股热容流率，kW?K-1
K ——传热系数
NOK ——换热器网络总级数
piping ——管道费用，USD?a-1
pumping ——泵送费用，USD?a-1
q h,q c ——分别为热、冷中间介质与过程流股换热量，kW
q hu,q cu ——分别为热、冷公用工程换热量，kW
ΔT ——换热器的平均传热温差，℃
ΔT min ——最小传热温差，℃
t(p,i,k) ——p厂i热过程流股在k级的温度，℃
t(p,j,k) ——p厂j冷过程流股在k级的温度，℃
t c(p,g,k) ——p厂g冷中间介质流股在k级的温度，℃
t c , in(p,g) ——g冷中间介质流股入p厂的温度，℃
t c , out(p′,g) ——g冷中间介质流股出p′厂的温度，℃
t h(p,g,k) ——p厂g热中间介质流股在k级的温度，℃
t h , in(p,g) ——g热中间介质流股入p厂的温度，℃
t h , out(p′,g) ——g热中间介质流股出p′厂的温度，℃
t in(p,i) ——p厂i热过程流股的起始温度，℃
t in(p,j) ——p厂j热过程流股的起始温度，℃
t out(p,i) ——p厂i热过程流股的目标温度，℃
t out(p,j) ——p厂j热过程流股的目标温度，℃
dt c(p,i,g,k) ——i流股与g流股于p厂k级的温差，℃
dt cu(p,i) ——i流股与冷公用工程于p厂的温差，℃
dt h(p,j,g,k) ——j流股与g流股于p厂k级的温差，℃
dt hu(p,j) ——j流股与热公用工程于p厂的温差，℃
y ——表示厂际管道是否存在的二元变量
z ——表示换热器是否存在的二元变量
Γ ——热流股与冷流股的温差最大值，℃
下角标
g ——中间介质流股
i ——热过程流股
j ——冷过程流股
k ——换热器网络级数
p ——单厂
p' ——p厂以外的其余单厂
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