Análise do impacto do ar primário no grau de redução em uma caldeira de recuperação no processo de papel e celulose

Abstract

One of the fastest growing industries in the world is the pulp and paper industry, which is based on the extraction of pulp from wood, mainly pine and eucalyptus. Given this market growth, it is important to keep improving the process to achieve the best possible efficiency. Within the Kraft process, there is a recovery process for the black liquor that is produced when the chip cooking, and for this recovery to take place, a reduction reaction is required in the recovery boiler, and for this to take place effectively, all the variables that can affect it must be analyzed. Therefore, the primary air is one of the factors that form the reduction layer of the boiler, and we want to know how it affects the reduction ratio or the reduction efficiency. For this purpose, a statistical analysis is performed to determine the operating parameters that can help to increase the reduction ratio. Here, the box plot is used to perform a comparative descriptive analysis, since the population of the sample is too large to perform a have a curve characteristic normal. In this analysis, we can see that the fluctuations of the primary air can indeed favor an increase in the degree of reduction of the boiler, but it is not possible to say that this correlation comes from the fluctuations of the primary air, since the test is only a comparison between data. It does, however, provide further information that several factors need to be checked in order to achieve the best possible boiler efficiency.