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Study on Synthesis of Water Utilization Network in Batch Processes

Author: WangChuanQiang
Tutor: DuJian；ChenLi
School: Dalian University of Technology
Course: Chemical Engineering
Keywords: Water Utilization Network Batch Process Center Reusable Water Storage Time Constraint Optimization
CLC: TQ085
Type: Master's thesis
Year: 2008
Downloads: 74
Quote: 1
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Abstract


Due to the scarcity of water resource and serious environment pollution, reducing fresh water and wastewater becomes a great matter of urgency. Synthesis of water network has been provided with dual benefits of improving the efficiency in resource utility and reducing the environmental pollution by water reuse, regeneration reuse as well as regeneration recycle. So the research in water network design has achieved great progress. Batch production is applied widely for food, medicine chemicals and fine chemicals. Therefore considerable attention has also been dedicated to the synthesis of batch water networks within recent decade.Compared to continuous processes, there is a time constraint to be satisfied in batch processes, in addition to the concentration constraint. Center reusable water storages can deal with the time constraint effectively and enhance the water recovery. In batch processes, when the water-using operation finishes, wastewater is deposited in storages. It is reused to following units as water resources. And the resources can be utilized within the whole process. The utilization efficiency of water is improved greatly. This paper presents a non-linear programming (NLP) mathematical model for freshwater and wastewater minimization in batch processes with center reusable water storages. The minimization of fresh water is achieved through the exploitation of reuse and recycle opportunities. The content of this paper is listed as follows:(1) As to the synthesis of water utilization network in batch processes, this paper presents a NLP mathematics formulation for freshwater minimization. Water using units are arranged according to time. The wastewater from the units is used to water resources for following units. The streams with the same concentration are deposited in the same storage. It is forbidden to reuse to the unit which concentration is lower than water resource. The NLP mathematics model is considered according to mass load, inlet concentration constraint. Then we solve the mathematics model by GAMS and obtain the minimum freshwater. Then we incorporate storages and remove the redundant streams by time and obtain the optimal water network. The proposed method is demonstrated with three examples.(2) Water utilization network in batch processes considering minimum the number of storages is investigated while guaranteeing the target for minimum freshwater. All the water resources with different concentration can be mixed and stored in each storage. The number of storages is taken as optimal variables. The volume and concentration of storage water will change on different time. And it can affect the water reuse condition and fresh water flowrate. This paper presents a superstructure of water utilization network and a non-line programming mathematical model. The model is to determine the minimum fresh water as the main aim, the number of storages, volume and concentration of water in storages as optimal variables. We optimize the batch water utilization process and establish the minimum fresh water.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical plant > Industrial water,water treatment
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