Abstract:
The process of obtaining coke in a conventional Non-Recovery coking plant consists of heating the coal mixture, causing devolatilization, generating coke which is the main fuel used in blast furnaces. The heating of the coal mixture occurs indirectly; the furnace walls receive heat from the combustion chamber fed by a mixture of blast furnace gas, coke oven gas and Linz Donawitz gas, or exclusively by the coke oven gas. Coke oven gas is essentially composed of hydrocarbons and is treated to remove impurities, tar, ammonium sulfate and light oils. Residual elements in the gas, even after the treatment process, are extremely harmful to the distribution pipes, forming corrosive compounds, that can lead to the collapse of pipes, causing accidents, expenses with repairs and loss of production. In this context, the present work aims to present the factors that led the replacement the main gas pipelines distribution in the basement coking plant 3 of Usiminas Ipatinga, ensuring process safety and operational stability