Abstract
The study on the integration of heat streams of the evaporation station for sorghum syrup concentrating is presented. The relevance of the research is is why the research, aimed at reducing the consumption of external energy and enhancing operating efficiency, is relevant and has practical value. The main purpose of the work is to create a scientifically substantiated design with enhanced economic indicators of operation, ensuring saving in consumption of hot utility (steam) and cooling water. The problem was solved using the pinch-analysis. Heat streams, requiring heating and cooling, were identified, and the alternative project based on the selection of the value of minimum temperature difference DT min ., was created. This value was calculated and substantiated based on the data on thermal streams. The stream of condensate of return steam, the heat excess of which had not been used so far, was added to the system. For the alternative project, the layout of heat exchange equipment was proposed, calculation of plate heat exchangers was performed. The designed network of heat exchangers made it possible to decrease the annual steam consumption by 18 %. Cost-effectiveness analysis was conducted by comparing the indicators for two of the projects of the syrup preheating department for the evaporation station. The proposed alternative project saves power consumption of cooling water by 35.9 kW, of heating vapor steam – by 60.5 kW. At the interest rate of profit tax of 18 %, implementation of the alternative project will pay off in 4 months. As a result, net annual gain of an enterprise is planned to increase by 16 %, at virtually the same payback period of the projects. Application of the methods of heat streams integration made it possible to develop an effective project of sorghum syrup preheating before evaporation and ensure saving of external utilities.
Highlights
Evaporation is currently the only actual industrial method of concentration of aqueous solutions, widely used in the chemical and food industries
This study presented the equation, which, according to the authors, can be used as a benchmark for thermal plants, including the integration of multi-effect evaporators
The need for research is related to the development of a new approach to designing the juice preheating department, based on maximum heat recovery to reduce operating costs
Summary
Evaporation is currently the only actual industrial method of concentration of aqueous solutions, widely used in the chemical and food industries. Principles of construction of evaporating stations are common to all industries, concentrating liquid products, regenerating solvents or particular liquid crystal mixtures. Designing the technological processes of evaporation and the use of different types of equipment for evaporating stations are the focus of a large number of studies, among which we can highlight the practical applications in papers [1,2,3]. The relevance of the research in this direction is determined, first of all, by the technology of the process, which requires high energy costs. That is why the research, aimed at a decrease in consumption of external energy and an increase in efficiency of evaporating stations, is relevant and has practical value
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