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Comment PDF Separation Processes

Filtration Centrifuges: An Overview

By Peter Schmidt Andritz KMPT GmbH |

To solve the task of solid-liquid (S-L) separation in the chemical process industries (CPI) a wide variety of methods are invariably used. Many of these methods are not mutually exclusive and include a selection of technologies that can be expediently combined to provide an efficient operating system. A good understanding of the options available and details of the individual system modules can enhance the efficiency of the overall concept. For example, mechanical separation using pusher centrifuges has proved to be a very expedient intermediate stage for the dewatering of sodium bicarbonate downstream of the vacuum filter and before calcination. By reducing the residual moisture between filter discharge and centrifuge discharge, some 38% of the required evaporation heat can be saved; and just a fraction of the saved energy is required to operate the centrifuge. This helps to protect the environment and also saves costs. This article presents a basic overview of different types of centrifuges with descriptions of how they operate and where they are applied in the CPI.   Some definitions To begin with, a distinction is made between thermal and mechanical separation of solid products from liquids. Whereas thermal S-L separators…
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