Перегляд за Автор "Tovazhnianskyi, V. I."
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Документ Investigation of Fouling in Plate Heat Exchangers at Sugar Factory(The Italian Association of Chemical Engineering, 2016) Demirskyy, O. V.; Kapustenko, P. O.; Khavin, G. L.; Arsenyeva, O. P.; Matsegora, O. I.; Kusakov, S. K.; Bocharnikov, I. O.; Tovazhnianskyi, V. I.The fouling formation in heat transfer equipment is the complex process, which is determined by the physical properties of the heat carrier, material of the unit and hydraulic characteristics of the flow. The mathematical model based on the asymptotic behaviour of water fouling is examined. The fouling process supposes the net rate of fouling accumulation as the difference between the fouling deposition rate and the fouling removal rate. The relation for predicting the fouling resistance dynamics during the time is proposed. The investigation of precipitation and particulate deposition in purified juice heating PHE for the first stage evaporation, which operates in sugar plant, was examined. In this position М15М plate heat exchanger produced by Alfa Laval is used. The analysis and mathematical simulation of the experimental data are presented. For the juice heaters the content of fouling deposition is mostly the calcium salts as calcium carbonates and sulphates. The parameters of the equation for deposition term estimation were determined for the regarded heat carrier. It allows to determine the deposition term and to simulate the fouling formation in time. The comparison of the experimental data and mathematical calculations showed a good agreement. The proposed mathematical model enables to predict the fouling formation behaviour in PHE as purified juice heater and to determine the operation term for the cleaning of this unit. Basing on the observed model, the software, which enables to determine the periods of PHE cleaning during the operation was developed. The comparison of the industrial measurement data with calculation results is presented.Документ The Mathematical Modelling of Fouling Formation Along PHE Heat Transfer Surface(The Italian Association of Chemical Engineering, 2017) Kapustenko, P. O.; Arsenyeva, O. P.; Matsegora, O. I.; Kusakov, S. K.; Tovazhnianskyi, V. I.The phenomena of fouling can significantly deteriorate the intensity of heat transfer process and influence heat exchanger performance. The correct account for fouling is especially important in PHE with much higher heat transfer coefficients than in tubular heat exchangers. The mathematical model of heat transfer in PHE subjected to fouling is proposed. The model is represented by the system of partial differential equations which integration permit to estimate local parameters of heat exchanging streams and developing in time local values of fouling depositions layer thickness. The fouling rate is determined with the use of fouling deposition model proposed earlier. The model is validated by comparison with the data obtained for PHE working in industry and can be used for more accurate calculation of PHE heat transfer area in conditions of fouling formation than methods relying on averaged process haracteristics. The model application is illustrated by two case studies for PHE application in sugar industry and in District Heating system.