Читать книгу Profit Maximization Techniques for Operating Chemical Plants - Sandip K. Lahiri - Страница 62

The aim of a profit maximization project is to maximize the profit generation in dollar per hour terms and sustain the profit at its peak value. Hence the first step of a PMP project is to calculate how much USD/h profit is generating from the plant in every hour on a real‐time basis. As a first step this is done by considering the whole plant as a big black box and mapping it as raw material and utilities as input to the black box and product waste and vent losses as output from the box. The value of each of these inputs and outputs are then calculated as a USD/h term. This gives an overall idea of how much profit is generating from the whole plant. In a second step, a more detailed calculation was done to estimate the USD/h generated or consumed in each major process equipment for the whole plant. Mapping the whole process in USD/h terms makes it easy to view where the actual loss of profit is occurring and to focus on that. This also combines different performance parameters usually used in process industries, like energy efficiency, yield, selectivity, specific consumption of utilities, etc., in a single cost framework and in order to make it easy to visualize the whole process in a single unit of measurements. This will help to access the current operation of the plant and gives an indication of where to focus in order to increase profit.