MODELLING AND STUDYING THE EFFECT OF DEPOSITS ON THE CONDITION OF PIPES OF SHIP BOILER SYSTEMS

Abstract

The purpose of the article is to carry out modeling and research of the impact of deposits on the condition of pipes to increase the effectiveness of protection against corrosion and the formation of scale on the heating surfaces of ship boilers. The goal is achieved by analyzing the features of scale formation and deposits. It has been established that when using water containing a large amount of minerals, solid sediments, called scale, can form in ship boilers during their operation. This scale has high strength, but has low thermal conductivity, which can lead to technical problems and increased maintenance costs for ship boilers. When calculating the thermal state of pipes, the thermal resistance of deposits is usually considered constant (often zero), not taking into account the fact that at the beginning of operation, the surfaces of the pipes were clean and worked in different conditions than at the end of their service life. Therefore, in order to properly estimate the service life of pipes, it is necessary to take into account the thickness of the layer of deposits and their composition when calculating the thermal state of the pipes. The most significant result is the determination of the dependences of the coefficient of equivalent thermal conductivity on the thickness of the sediment layer on the pipes of ship boiler plants, the difference in temperature of the pipe section of ship boiler plants from the coefficient of equivalent thermal conductivity, the difference in temperature across the pipe section of ship boiler plants from the thickness of the sediment layer and the duration of operation of the pipes of ship boiler plants from scale formation intensity. The results of the research can be used to develop methods for monitoring the condition of pipes and planning their replacement, which will increase the efficiency of operation of ship boiler plants. The proposed approach to sediment modeling can be applied to assess the thermal state of not only the pipes of ship boiler plants, but also the pipelines of other systems during their long-term operation period. Modeling and research of the effect of deposits on the condition of pipes of ship boilers is based on the set of mathematical expressions proposed in the article.