| Scarcity of water is a significant problem that human being is facing. water saving and emissions reduction has become the focus of a petrochemical enterprise in the pursuit of profits and environmen protection.Water-network optimization aiming at reduce freshwater consumption and wastewater production has been more and more attention. In response to the global increasingly serious shortage of available water resources, the world put forward higher requirements for the rational use of water and the treatment of waste-water in the situation of promoting sustainable development.In this paper, we chose water pinch analysis method as water network optimization method to research single impurity system by contrast the advantages,disadvantages and scope of various common methods. Describes the main steps of pinch analysis method which is using concentration-load curve or problem-table method to determine the position of the pinch and get the minimum fresh water flow rate, proceeding the reasonable allotment of each flood level according to the needed maximum mass transfer driving force or the minimum matching number method, clearing water allocation of per level water pipeline and making a water distribution network diagram.we analysis water unit status quo of a petrochemical plant, collect valid data and comparative analysis to get the water unit with optimized value, at last choose the water network with six water unit as the research object and put the particulate matter as the key material, using pinch analysis method to optimize the water network: firstly the minimum fresh water flow rate obtained using problem-table method, then using the minimum matching number method to determine the flow distribution at all levels to obtain a water distribution network diagram. Prior to the transformation the consumption of fresh water is 210 t / h, after the transformation the consumption of fresh water is reduced to 90 t / h, the water-saving rate is 57.14%.The utilization rate of water get the biggest degree after the optimization and achieved cascade utilization of water floods.In the process of determining the minimum fresh water flow rate by using concentration-load curve to obtain the point need to move the line of supplying water. If the point is inaccurate will eventually create deviation of determining the minimum fresh water flow rate, but using problem-table method can avoid this problem. However, when the water network researcher include too much water units, the process using problem-table method to calculate the minimum fresh water flow rate will become very complicated, an error occurred during the calculation of the probability greatly improved. This paper design calculation software which can achieve problem-table method by Visual Basic programming. The software includes form modules and program command editing modules. The form modules achieve the objectives of demanded data input and final result output, and the program command editing modules realize computerization of calculating process. The software is applicable to water network computing process whose unit of using water is determined, the man-machine interface is clear, data input and output process is simple, and commands is easy-to-understand.In order to response the situation of the number of using water unit in the water network may increase or decrease, calculating the minimum fresh water flow rate by the method of combined Matlab and Excel.Using Matlab software to edit M file which meet the calculate requirements of problem-table method. Adding calls in M file to enter the known data in an Excel file and displaying the results in another Excel file.There is no limit to the number of researched using water units in the combination of Matlab and Excel through the process of solving the water network minimum fresh water flow rate. At the same time, this system can display all calculate results of each step that can be easy to be verified. |
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