Online estimation of pulp mixing in paper industries

Paper industries are using manual chemical control methods to apply the chemicals to the digester. The main objective of the project is to increase the quality of the paper by increasing the brightness of the pulp. The brightness of the pulp is inversely proportional to the pH value. Hence, the pH value should be maintained in the range of (2–4) to achieve the maximum brightness range 85%. Initially, concentrated sulphuric acid is pumped from the filtrate to the stand pipe in which the pulp is present. This mixture is mixed with the bleaching agent (ClO2 solution) in a D0 mixer. The acidity is controlled by the brightness given by a device. The industries are facing difficulty in calculating the accurate amount of acid to be supplied. The brightness shows fluctuations and makes it more difficult. In order to solve this problem, we are introducing pH meter(to detect the acidity of the solution) parallelly to the mixer. Due to this, the wastage of the pulp and chemicals is reduced and the quality of the paper is increased.