DEVELOPMENT OF THE ALGORITHM FOR IMPLEMENTATION OF ENERGY-EFFICIENT COMPRESSED AIR SYSTEMS WITH ENERGY RECOVERY

In order to improve the energy efficiency of pneumatic systems, this paper presents an algorithm for the devlopment and implementation of an energy efficient pneumatic control system with energy recovery of compressed air. Two different ways of forming closed pneumatic circuits that reuse already used compressed air are presented. Compared to traditional pneumatic control, significant energy savings are achieved

Copper removal by pelletized fly ash

The increasing levels of industrial wastewater that are released to the environment present a serious threat to human health, living resources, and ecological systems. Fly ash was tested for the removal of Cu2+ from contaminated water in a micronized and pelletized form. Experiments were performed for a wide range of initial concentrations of Cu 25-600 mg dm-3. Pellets fraction size was 2.0-3.5 mm, while the content of cement, as a binder was 10%. Under applied experimental conditions pellets manifested exceptional adsorption capacity (25.64 mg/g) that was three times higher compared to the micronized fly ash (8.85 mg/g)

Sistemski prilaz razvoju energetski efikasnog multiaktuatorskog pneumatskog upravljačkog sistema sa rekuperacijom energije vazduha pod pritiskom

The main goal of this doctoral dissertation is to increase the energy efficiency of pressurized air in production systems and establish measures for rational consumption and efficient production, preparation, distribution and access to the company. In addition to the basic goal, the subject research is focused on the identification and development of measures that can contribute to increasing energy efficiency in automated pressurized air systems. Therefore, special attention is paid to the possibility of minimizing losses and reducing the total consumption of pressurized air in automated industrial systems with pneumatic actuators. This doctoral dissertation is based on the hypothesis that a more energyefficient pressurized air system can be obtained by using procedures for the controlled collection of used pressurized air and its, partial or complete, return to the system, without jeopardizing the dynamic characteristics of the system. A comparison based on experiments using commercially available equipment shows the applicability and effectiveness of these methods, as well as the level of savings in energy consumption. The goal of the dissertation was achieved by the implementation of several partial tasks (experimental plants were implemented). These facilities include the implementation of pressurized air systems in which it is possible to manage the movement of working elements, determine the optimal air consumption of each element, change the working pressure (determine the optimal value) and thus influence the position of the working elements, i.e. determine the minimum force that can move the actuators. After that, parts of those experimental facilities were integrated into one comprehensive one, and experiments were carried out on it, which served as the basis for the development of the previously mentioned model. In addition to the basic goal, the subject research is aimed at identifying the causes of inefficient operation of the initial system and the development of measures that can contribute to increasing energy efficiency in automated pressurized air systems. This refers to the possibilities of minimizing losses and reducing the total consumption of pressurized air in automated systems. To this end, research was carried out and the development of new structures of an energy-efficient automated pressurized air system was proposed