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Introduction: Several factors are identified in the raw sugar mill that increase energy consumption and introduce technical, economic and environmental risks Objective: To evaluate the energy system through the application of energy management systems. Materials and Methods: The energy review included the application of traditional methodologies for the thermo-energetic balance and the use of Sistema Termo Azúcar 4.1 software according to the Cuban Standard ISO 50001. Results and Discussion: An energy baseline is established, which allows the industry in a comparative way assess energy performance of the process. Conclusions: The use of STA 4.1 software in the studied industry constituted a useful, practical and reliable tool for analyzing the energy system. High level of technology obsolescence and poor condition of thermal insulation constitute the main technology deficiencies of industry. The economic benefits obtained with the modification of generation and cogeneration system and thermal insulation rehabilitation justify the proposal of three investment projects that contribute to increase the efficiency in energy use, whose recover investment is estimated in 3 years.

It is necessary to establish in the installed equipment, operating conditions and quality specifications in the purification of furfural produced in Cuba. To do this some literature review and experiments are carried out. The approved batches by the quality control are quantified as well as the heat and evaporation losses and the impact on workers health. Energy management is performed by identifying electricity as the energy source of higher consumption. Some measures are applied like coating the evaporator portions that are required together with condenser modification and improvement of the room ventilation. As a result it was shown that it is possible to purify the Cuban furfural in the installed equipment, the process efficiency increases in 5,5 %, the evaporation losses decrease and non-acceptance by quality control drops. If the imported furfural is replaced by the Cuban are saved about 39 000 • per year production.

In this paper were simulated and evaluated five alternatives of cogeneration scheme that promote a higher production of thermal and electrical energies as well as its right management. The first three alternatives are directed to increasing the boiler pressure and a change of steam turbines which are the extraction-condensation type, and then the fourth alternative proposed a boiler change to implement a bubbling fluidized bed and finally in the fifth alternative a scheme of biomass gasification is analyzed. All scheme were analyzed energetic and exergetically. The five cogeneration alternatives were simulated in ASPEN PLUS; they showed that the largest surplus bagasse and electricity are obtained with the scheme of a biomass gasification and the worst results in these parameters were obtained in the alternative that function in low pressure and temperature parameters

An energy study was performed at Pulpa Cuba Paper Mill, located in Sancti Spiritus, where an energy management system was applied according to NC: ISO 50001, in order to assess the energy system by applying energy management systems for energy and water reduction in the paper mill, in which the current steam generation, distribution and consumption system is diagnosed. The proposal of a modified energy scheme with 1 MW Backpressure Steam Turbine Generator and rehabilitation of the original boiler or installing a lower capacity boiler contributes to save financial resources by the concept of water, fuel and electricity. The implementation of four projects will save 3,095,574 CUC / y and an average payback period of about 1 year is expected.

Introducción: En la fábrica de producción de azúcar crudo se identifican varios factores que incrementan los consumos energéticos e introducen riesgos técnicos, económicos y ambientales. Objetivo: Evaluar el sistema energético, mediante la aplicación de sistemas de gestión de la energía Materiales y Métodos: La revisión energética incluyó la aplicación de las metodologías tradicionales para el balance termoenergético y el uso del software Sistema Termo Azúcar 4.1 según la norma cubana ISO 50001. Resultados y Discusión: Se define una línea de base energética que permite a la industria evaluar de forma comparativa el desempeño energético del proceso. Conclusiones: El uso del software STA 4.1 en la industria estudiada constituyó una herramienta útil, práctica y confiable para el análisis del sistema temoenergético. El elevado nivel de obsolescencia tecnológica y el mal estado del aislamiento térmico constituyen las principales deficiencias tecnológicas de la industria. Los beneficios económicos que se obtienen con la modificación del sistema de generación y cogeneración y la rehabilitación del aislamiento térmico, justifican la propuesta de tres proyectos de inversión que contribuyen a elevar la eficiencia en el uso de la energía, cuya inversión se estima recuperar en 3 años.

The current society needs now more than ever of industries that create new forms and methods where the saving of energy and materials is a fundamental aspect. For this reason, in the present investigation we present an outline with the considerations for the integration of the processes of sugar and other derived products, in an outline of bio refinery with the objective of achieving efficient processes with an appropriate use of the material resources and an efficient use of the energy, with minimum operation costs and investment. In the outline we take as base for the study, it is considered that the integrated complex has as basic input the sugarcane; it is also considered the variation of the prices of the products in the market. In the article we make an outline with the precise steps for the development of a methodology that allows analyzing the processes involved in the biorefinery outline and in this way to identify the common material and energy resources that the processes exchange. A heuristic diagram is presented that guides the strategy to continue for it.

Sugar factories do achieve an efficient use of process water, but this process should be self-sufficient for consumption because these sugar factories have the special characteristic of having as its main raw material, sugar cane, which consists in approximately 70% of water Those condensed recovered will be the first option to recover process water and are aimed to the feeding of boilers. The quantities of the condensate types are dependent of the evaporator’s configuration, also the grade in that show up the vapor extractions. In this paper the fundamental aspects are described as for the use and handling of water in the process of sugar production. Also, important considerations are shown on the treatment systems of residual that are generated in these factories. The evaporation system is shown as the most important area for the handling of water in the process, in it, vegetable vapor takes place and it is used in other technological equipment. A major surplus of steam will be produced in this area if the process is more energetically efficient. It is shown through a balance of water that the process is self-sufficient for water consumption.