Study On The Process Simulation For Reducing Total Energy Cost In The Chlor-alrali Process

Energy conservation and reducing consumption have always been one of the most important problems and the most active fields researched in the chlor-alrali industry. Because of depression of electricity price and the elevation of vapor price, if the technologic target of the chlor-alrali enterprises, especially concentration of electrolyte, had been not adjusted , it will be obviously difficult to guarantee the least cost of electricity and vapor consumed. This paper does not intend to reduce consumption of energy, but to reduce the fee of energy for which the causic soda is produced by the asbestos baffle. The technologic target of the chlor-alrali process has always been designed according to the minimum consumption of energy, but the total fee of energy may be uncertain minimum owing to the different price of the vapor and electricity in different areas. For example, the price of electricity is lower in our plant, but the price of vapor is higher. So the minimum total fee of energy would be ensured by razing the concentration of electrolyte and reducing the vapor consumed although the total energy consumed may be not minimum, owing to the more consuming energy of electricity caused by the lower efficiency of electrolysis.The intention of this paper is to guarantee the minimum fee of energy on the base of existing equipment of the plant by adjusting the technologic target of the electrolysis and evaporation processes making use of flower sheeting, which is the two section of the most energy consumed. At the same time, the influence of the adjusting to the product quality and the equipments caused by the charge of technologic target would be considered. Then a software was developed to calculate the minimum fee of energy according to the different price of the electricity and vapor.In this paper, at first, the significance of the energy conservation to the cholor-alrali enterprises was briefly discussed. The current technology of energy conservation and reducing consumption were described, also the current computer technique used in chlor-alrali enterprises was introduced . Then, mathematical modes for the fee calculation of electricity and vapor was developed on the base of the technological principle of electrolysis and evaporation. The software according to the modes was processed by computer flow sheeting. The optimized targets of concentration of electrolysis had been obtained by application of the software. Based on the optimize targets, the optimize concentration of electrolysis had been calculated out while energy fee was minimum. Furthermore, the technical economic analysis of the calculation was carried out. Further, the contrast checking between the calculating targets and the practice targets had been made to determine the exactness of the calculation. At last, the processes and methods of flow sheeting was briefly discussed. Basing on the work mentioned above, the optimal technologic targets had been obtained for our enterprises; With the software application, the fee of the electricity and vapor consumed in our enterprise can be obviously cut down.