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Single - impurity energy integration of industrial water network design

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Tutor: YinHongChao LiZhenMin
School: Dalian University of Technology
Course: Energy and Power Engineering
Keywords: mass/heat exchanger network,State Space Representation,necessary optimality cond
CLC: TU991.4
Type: Master's thesis
Year:  2003
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It’s very important to carry out a research on the design of industrial water-using networks because of the more and more critical problems of energy conservation and water saving in industrial enterprises. This paper attempts to carry out a methodological research on the industrial water-using network with single contaminant and featuring minimum fresh water targeting and minimum heating utility targeting, and at the same time considering the capital costs. The content of this paper are as follows:1.The conceptual framework and application of the State Space Approach to mass exchanging network, are presented. And this paper extends this method to the process network system, which includes mass and heat exchanger networks. This approach divides the process network system into three relatively independent organic units——input and output unit, mass exchanging network unit and heat exchanging network unit. The input and output unit is in charge of the input, output and distribution of the streams. While the mass/heat exchanging network unit defines the mass/heat exchanging connection, which can be described as operator for process integration. Different principles of process integration correspond to different operators. And corresponding mathematical programming models are developed to solve the problem. 2.The necessary optimality conditions of water utilization network in process plants with single contaminant are brought out. These necessary conditions are used to simplify the NLP model featuring minimum fresh water targeting to LP model, which not only makes the problem easy to be solved but also saves the computing cost. The strict mathematical proofs for these conditions are carried out in this paper.3.The design of water utilization network with single contaminant and featuring minimum fresh water and minimum heating utility are carried out. Based on the structure analysis of water-using network with single contaminant, this paper first develops NLP model featuring minimum fresh water targeting, which is then turned into LP model by use of necessary optimal conditions. And then, the State Space Approach of water utilization network is employed to form LP model featuring minimum fresh water utilization and minimum heat utility targeting. Finally a MILP model featuring minimum number of matches is developed to design the heat exchanger network and its corresponding water utilization network.4.In the end an example has been employed to illustrate the application of the approach discussed in this paper. What’s more, a merging procedure has been introduced to further optimize the heat exchanger network. The example shows that the method based on the state space representation is efficient.
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