Keywords: energy efficiency

Improving the energy efficiency of the drying process of fibre materials

https://doi.org/10.58224/2619-0575-2024-7-3-109-119
Abstract
In the modern textile industry, one of the most energy-consuming and widespread processes is drying, to which fibers, yarns and fabrics are subjected after various operations (impregnation, extraction, dyeing, etc.). A complex heat and mass transfer drying process is carried out at sufficiently high temperatures and is energy-consuming. To reduce the overall energy consumption in textile production, it is necessary to carry out preliminary dehydration of materials before drying, for example, in centrifuges, intensification of drying by physical fields, etc. Modern industrial drying plants for textile materials provide sufficiently fast and uniform drying, increasing the overall efficiency of this stage of production of finished textile products. Energy-efficient solutions for the drying process can reduce the negative impact of the process on the environment. Industrial drying of textile materials is carried out in convective or contact dryers using thermal energy. In convective dryers, the drying agent is air. In contact dryers, water vapor is used to heat the drums. The article discusses important areas of improvement of the technological process and equipment designed for drying fibrous materials. These include: the introduction of me-chanical pre-drying dewatering; the choice of hybrid systems in drum dryers; utilization of condensate and steam in drum dryers; insulation of end panels and the abolition of intermediate drying in drum cylindrical dryers; con-trol of moisture content of the material to prevent drying of the fabric; reduction of dryer downtime by planning the supply of batches of fabric; the use of multiple drying of fabric in drum dryers. The improvement of the drying pro-cess of textile materials is possible with the use of an ultrasonic field, infrared radiation and other intensification methods while ensuring timely maintenance of drying equipment, programmable temperature changes during the drying process.
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OPTIMIZATION OF RECTIFICATION PROCESS DURING BUTANE PRODUCTION

Abstract
The article describes the method of studying the parameters of the rectification process in the production of butane from associated petroleum gas. The method allows to optimize this process in terms of reduction of energy and operating costs and to achieve the goal of increasing efficiency of separation of hydrocarbon components of raw materials – mixture of gases. These tasks are relevant, as their solution saves expensive energy and valuable commodity products. However, mathematical modeling of rectification processes is very complex and problematic without the application of modern numerical methods and computer programs solving systems of hundreds of nonlinear equations. One of the most suitable programs for such modeling is Aspen Hysys, which also allows to create visual diagrams of technological processes used in the oil and gas industry. This paper considers one of the problems solved in butane production – reduction of operating costs by reducing power consumption when selecting the number of plates of the rectification column and the number of the feed plate to which the initial product is supplied. The composition of the gas mixture is taken for one of the oil and gas deposits, which is char-acterized by a high proportion of butane in the associated gas composition. Aspen Hysys has developed a process model for producing butane that meets product requirements. Based on the results of the work, recommendations are given on the application of the developed methodology for the study of the influence of various factors on the efficiency and cost of technological processes in which rectification columns are used.
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APPLICATION OF NANOFLUIDS IN REFRIGERATING ENGINEERING

Abstract
Еlectricity consumption by refrigeration equipment is about 20% of the total energy consumption. Ways to improve the efficiency of refrigeration units is one of the most urgent tasks in the light of the general policy of energy saving in the world. The efficiency coefficient of refrigeration machines depends on the efficiency of heat exchange in the system. In addition to the obvious ways to improve the design of the refrigeration circuit itself, there are a number of alternative solutions to improve the energy efficiency of heat exchange processes. Among them there is the addition of metal oxide nanoparticles to the circuit, which have a high heat transfer coefficient. The article presents a review of the literature on the use of nanoparticles in cooling systems, which describes the energy efficiency from 9.6% to 28% depending on the material of nanoparticles and their concentration. Also, an experimental re-frigeration unit was manufactured, where copper oxide nanoparticles in a concentration of 1% were used. This installation showed a decrease in electricity consumption by 18%, as well as a better dynamics of temperature de-crease.
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