Simultaneous Optimization Of Heat And Water Exchange Networks In VCM Production

Water and energy are essential resources for process industries. Process industryis currently facing powerful economic and environmental driving forces to minimizethe uses of energy and water, due to the ever-increasing prices of energy, the short offresh water on earth, and the stricter environmental regulations. PVC manufacturingprocess, as a large consumer of heat and water, plays an important part in the societyeconomic. Therefor, the minimization of heat and water in PVC production isnecessary.In his work, we adopt mathematic method to optimize the heat and waterexchange networks of VCM production process. And the main aspects are as follows:At first, the state-space superstructure is employed to illustrate the water and heatexchange networks. The whole superstructure is divided into two parts: thedistribution network and operation network, which help explain the connectionsbetween heat and water exchange networks. And based on the establishedsuperstructure, the mathematical model is established. And this mathematical model,which divided into three parts: the heat exchange networks, the water exchangenetworks, and the connections between heat and water exchange networks, analyzesthe problem from a new perspective,Then, in order to get the result more easily, the boundary and the initialization ofthe variables in the model are discussed. After that the operational software LINGO isemployed to solve the mathematical model, in order to prove the validity andsuperiority of this model, the example from R. Smith proposed in2005is discussedby this method. And the comsumption of water and utility is set as the objective in themodel.At last, the method proposed before is adopted to optimize the purify process inVCM production. And the results that show advantages proved that it can guide thepractical operation well.After these analysis and calculation, all results indicat that this model is rightwhen it is employed to simultaneously optimize the water and heat exchangenetworks, and it can guide the practical operation well.