An RWCE Algorithm for Heat Exchanger Network Optimization with Selective Acceptance of Imperfect Networks Strategy

doi:10.19596/j.cnki.1001-246x.8300

Abstract

Abstract:

As random walk algorithm with compulsive evolution is used to optimize heat exchanger networks, it promotes effectively structural evolution by accepting difference solution with certain probability. Non-greedy difference solution search mechanism is the key for the target function to jump out of local extremum. We analyze accept imperfect networks mechanism, explore different sources of imperfect networks of the optimization phase structure, and show the next year comprehensive cost change. We found that most acceptable solution return to the original structure in the subsequent optimization. There exist a lot of invalid parameter passing process. In this paper we present a selective acceptance of imperfect networks strategy, in which only difference solutions with new individuals are accpted based on an exponential increasing probability formula. Structure of new individual is protected to enhance its survival rate in structure. Finally, 9SP₂ and 20SP examples were used for verification. The optimal results are better than those in literature, which shows feasibility of the strategy.

Key words: heat exchanger networks optimization, accept the imperfect networks, structure evolution

CLC Number:

TK124

Qianqian ZHAO, Guomin CUI, Zhengheng HAN, Yuan XIAO, Yue XU. An RWCE Algorithm for Heat Exchanger Network Optimization with Selective Acceptance of Imperfect Networks Strategy[J]. Chinese Journal of Computational Physics, 2021, 38(4): 489-497.

Figures/Tables 14

References 22

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Steam	T_in/℃	T_out/℃	M_{c_P}/(kW·K^-1)	h/(kW·m^-2·K^-1)
H1	327	40	100	0.5
H2	220	160	160	0.4
H3	220	60	60	0.14
H4	160	45	400	0.3
C1	100	300	100	0.35
C2	35	164	70	0.7
C3	85	138	350	0.5
C4	60	170	60	0.14
C5	140	300	200	0.6
HU	330	250		0.5
CU	15	30		0.5
Annual cost of heat exchangers=2000 + 70A＄·a^-1；
Annual cost of hot utility=60 ＄·kW^-1·a ^-1;
Annual cost of cold utility=6 ＄·kW^-1·a ^-1

Steam	T_in/℃	T_out/℃	M_{c_P}/(kW·K^-1)	h/(kW·m^-2·K^-1)
H1	327	40	100	0.5
H2	220	160	160	0.4
H3	220	60	60	0.14
H4	160	45	400	0.3
C1	100	300	100	0.35
C2	35	164	70	0.7
C3	85	138	350	0.5
C4	60	170	60	0.14
C5	140	300	200	0.6
HU	330	250		0.5
CU	15	30		0.5
Annual cost of heat exchangers=2000 + 70A＄·a^-1；
Annual cost of hot utility=60 ＄·kW^-1·a ^-1;
Annual cost of cold utility=6 ＄·kW^-1·a ^-1

IT	S₁	ΔF₁/(＄·a^-1)	S₂	ΔF₂/(＄·a^-1)
(1, 1×10⁷]	11 046	3 353 723	7 450	3 496 756
(1×10⁷, 2×10⁷]	44	1 678	4	401
(2×10⁷, 4×10⁷]	1 213	109 679	133	8 884
(4×10⁷, 8×10⁷]	0	0	19	3 119
(8×10⁷, 1×10⁸]	0	0	2	71

IT	S₁	ΔF₁/(＄·a^-1)	S₂	ΔF₂/(＄·a^-1)
(1, 1×10⁷]	11 046	3 353 723	7 450	3 496 756
(1×10⁷, 2×10⁷]	44	1 678	4	401
(2×10⁷, 4×10⁷]	1 213	109 679	133	8 884
(4×10⁷, 8×10⁷]	0	0	19	3 119
(8×10⁷, 1×10⁸]	0	0	2	71

Steam	T_in/℃	T_out/℃	M_{c_P}/(kW·K^-1)	h/(kW·m^-2·K^-1)
H1	500	420	9	1
H2	480	390	10	1
H3	430	370	11	0.8
H4	420	340	9.5	0.7
H5	440	370	7.5	0.7
H6	390	330	6.5	0.8
C1	300	465	16	0.6
C2	330	450	12	1
C3	360	520	14	0.7
HU	650	649	927	1
CU	300	310	17	2.5
Annual cost of heat exchangers=1800A^0.65 ＄·a^-1；
Annual cost of hot utility=80 ＄·kW^-1·a ^-1；
Annual cost of cold utility=20 ＄·kW^-1·a ^-1