Evaluation method for energy parameters and energy saving potential of oil reservoir pressure maintenance pumps operating beyond permissible limits

Oil reservoir pressure maintenance pumps are often pushed to operate significantly outside of their original design parameters. This can cause operating problems which impact their reliability and efficiency. The author offers the evaluation methodology for energy parameters and energy saving potential of oil reservoir pressure maintenance pumps in order to develop major pump parameters like efficiency, pressure, and specific electric power. The methodology was tested on 42 pump units. The values of variations of basic parameters indicate the energy saving potential of pump units.

Flywheel energy storage systems and their applications in power engineering

The continuous growth of renewable energy sources has drastically changed the paradigm of electric energy generation and distribution. Flywheel energy storage systems are a clean and efficient method to level supply and demand in energy grids, including those incorporating renewable energy generation. Environmental safety, resilience, high power capacity and quality make flywheel energy storage very promising. This paper contains a review of flywheel energy storage systems, already being in operation, and applications of flywheel energy storage in general.

Synchronization of wind farm power supply into the utility grid

Wind turbines and wind farms can be connected to the major electricity distribution system. This paper presents the research results on synchronization of wind farm power supply into the utility grid depending on parameters of the grid at the moment. Measurement time gets synchronized with the external time signal delivered from a navigating system like GLONASS. This can help eliminate antiphase operation of individual wind turbines. Connection diagrams and the whole methodology presented in this paper aim to make wind farm power supply into the grid more effective and loss-eliminating.

Automated system for solar power plant intelligent monitoring

Advances in diagnostics and monitoring using aerial surveillance drones can provide a clear overview of the operational status of solar arrays. The authors have developed an automated system for solar power plant intelligent monitoring and maintenance. The mentioned system, which is intended for detecting shades and dust covering cells, consists of a drone and intelligent control system situated on the ground. Preliminary test results have shown that accuracy of faulty parts is 92 % if the weather is clear. In order to assess efficiency of the developed system, the authors have built a mathematical model for counting all contributing factors like a solar power plant’s established capacity, UAV type, computational performance, and weather conditions.

Polygeneration technology and equipment for energy and water supply systems of oil and gas enterprises

A novel polygeneration technology and equipment concept has been suggested for energy and water supply systems of oil and gas enterprises. It was created in order to enhance opportunities of mutual integration of power and manufacturing systems using recuperation and recycling. As an example, we have described a system which incorporates modules for combined energy resource and water generation as well as wastewater and low pressure hydrocarbon gas recycling. Feasibility of polygeneration and mutual integration was assessed with use of a multi-criterion concidering efficiency and effectiveness.

Industrial environmental control and technical regulations for cancer-causing emissions from thermal power plants

Current environmental safety rules and regulations require power companies to apply for comprehensive environmental permits calculating permissible emissions of cancer-causing and mutagenic substances for each source of pollution. Difficulties of instrument testing and monitoring of cancer-causing emissions prevent industrial companies from adequate regulatory limit applications. The author of this paper proposes research results on gas duct sizing for boiler plants in order to allow engineers performing correct instrument testing for compliance with the requirements of comprehensive environmental permits.

Evaluation of a permissible roadbed thawing depth in permafrost

Roadbed thermal conditions in permafrost are subject to seasonal changes affecting roadway resilience. A roadbed thawing depth is important for road base processing, especially in permafrost. This research had the purpose of evaluation of a permissible roadbed thawing depth based on the Biot number reflecting general thermal resistance of roadbed layers. These results will contribute to understanding road bed thermal resistance and selection of roadway construction materials.

Energy efficiency comparison of three-phase transverse and longitudinal field inductors

The paper presents the results of energy efficiency and traction evaluation of linear induction machines for with molten aluminum recycling furnaces. Ansys Maxwell software was used for the synthesis of 3D parametric models of electromagnetic fields for a large air gap furnace. Interchangeable modules of three-phase transverse and longitudinal field inductors were used as a subsystem of a parametric model. Both inductor models include invertor low frequency power supply. Transverse and longitudinal field inductors have been designed with similarity principles. A stationary electromagnetic mode and power parameters has been modeled without taking melt hydrodynamics into account. Linear induction transverse-field machines have demonstrated higher efficiency.

Efficiency of steam turbines with bypass steam distribution for primary frequency control in power systems

This paper evaluates efficiency of steam turbines with bypass steam distribution involved in a process of primary frequency control in power systems. We calculated power of a steam turbine and power unit in general, and absolute electrical efficiency for both bypass and throttle steam distribution. It was found that bypass steam distribution increases absolute electrical efficiency of steam-gas units while operation under lower capacity. Economic indicators calculated for combined cycle gas units confirm effectiveness of steam turbines with bypass steam distribution involved in primary frequency control.

Safety of premises with cumulative hazards of emitted airborne substances

HVAC codes and standards mention that a cumulative effect of hazards from emitted harmful airborne substances can occur. In this case, air exchange should not be calculated based on a simple summation of contributions of those harmful substances as long as environmental safety will not be assured, what has been mathematically proven. This paper contains a numerical and graphical approach description as well as calculation of a minimally allowable supply air flow assuring safety of premises with cumulative hazards of emitted airborne substances.