The parameters of the off-grid power system with a biomass gasifier engine for the autonomous power supply of forest harvesters

Abstract The paper analyses the results of the simulation modelling of autonomous power supply system of forest electric drive harvesters. MATLAB with the use of dynamic modelling Simulink tools was employed for the simulation modelling. The modelled system incorporates gasifier for solid fuelwood, a heat engine, an electric generator, a battery, and electric drive engines for the mechanisms of a mobile wood chipper. The authors determined that the minimum 12 A h Battery is required to ensure the uninterrupted operation of an off-grid power system with a gasifier, a 300 kW heat engine and a 200 kW engine wood chipper. The model allows for measuring the system performance indicators in various operating modes. The specific consumption of fuelwood was 2.217 kg/kW h in the specified mode.</jats:p

Development of an autonomous energy supply system for harvesting wood resources based on wood fuel

Abstract A number of original technical solutions of energy supply system of technological processes of wood harvesting and production of chips in the cutting area and upper warehouse are presented. It is proposed to use generator gas from chips instead of traditional motor fuel. The autonomous power supply system includes a power plant with a DC motor and a hydraulic station, a power cable for transmitting electrical energy and a power plant. The power plant is installed on the chassis of the technological machine. The power plant equipment is located on a separate car trailer chassis. The power plant includes a battery of electrical energy, a DC generator, a heat engine on the generator gas, gas generators and a container with a fuel reserve. For cable rolling along the cutting area, special patented rollers are offered. The use of this system can save up to 870 liters of motor fuel from non-renewable resources per 1,000 cubic meters of harvested wood.</jats:p

Development and numerical simulation of a power plant with a closed-cycle gas turbine running on wood fuel

The paper presents a number of original technical solutions for a mobile power plant based on a closed cycle gas turbine. The power plant is designed to operate on wood fuel in the conditions of timber warehouses, timber terminals and wood processing industries. The design of a heat generator using wood chips from production waste is proposed. Numerical modelling of the power plant in the SimInTech program was carried out. As a result of mathematical modelling, the main indicators of the power plant were determined. As a result of numerical experiments, the maximum electric power of the power plant was determined to be 1203 kW gross. The optimal initial pressure of the working fluid in the system is determined to be 0.52 MPa under the condition of maximum power. This power was recorded when using a turbine and compressor with a nominal frequency of 1000 Hz, helium as the working fluid of the turbine, combustion products of wood chips with a temperature of 1050 °C in the amount of 11 kg/s, and the use of evaporative cooling. The results obtained can be used in the development of solid fuel power plants with closed cycle gas turbines

Evaluation of the efficiency of apple picking using a flexible manipulator

Abstract Flexible manipulators are a promising executive tool in various technological complexes. In the process of collecting fruits, they can, in addition to their main task of delivering working bodies to the object of labor, also perform the functions of flexible guides. For the use of flexible manipulators in agriculture, namely in the operations of harvesting apples, developments are needed that are relatively cheap to manufacture in comparison with other flexible manipulators. To analyze the efficiency of apple picking using a flexible manipulator, a series of tests was carried out. As part of the tests, the process of picking apples was simulated using a flexible manipulator. The number of apples harvested for branches of various geometries was estimated. Within the framework of the discussion, the prospects of introducing a flexible manipulator in super-intensive gardens in Russia were assessed.</jats:p

Improving a no-failure operation of a PV systems with grid inverters for agricultural regions

The growing interest to the use of power generating complexes based on renewable energy sources has been witnessed recently. It necessitates the need to improve the no-failure operation of such complexes. The highest failure rate is typical for the string inverter in grid-connected PV systems. The failure of the string inverter induces supply termination of electrical energy to the grid. The paper explores an approach to improve the no-failure operation of the process of electrical energy distribution by a PV system to the grid driven by the use of micro inverters. The authors used the logical-probabilistic method to assess the no-failure operation of the PV system. Thus, the authors obtained the expressions to calculate the probability of failure for PV systems, enclosing a string inverter, and micro inverters

Modeling the operation of recuperative ventilation system of cowshed with air-fountain adsorption devices

Abstract Analysis of promising directions for the development of technical means for providing a microclimate at livestock farms shows that the most promising are aerial adsorption and catalytic apparatuses. To assess the effectiveness of the application of the developed technological solutions, the modeling of the operation of the recuperative ventilation system of the barn with air-flow adsorption devices was carried out. The results obtained show that the required microclimate in the barn is provided. The required number of heat transfer units for the air fountain heater and heat exchanger, as well as the rational value of the specific capacity of the gasholder, have been determined.</jats:p

Destruction of thermal insulation and effectiveness of the thermal energy transfer system

The work is devoted to improving the efficiency of the system of thermal energy transportation. The results of determining the thermophysical properties, such as the coefficient of thermal conductivity, water absorption, vapor permeability, the percentage of structural changes in the fibers during heating and exposure to vibration, basalt super thin fiber and other thermal insulation materials are presented. The results of thermal imaging testing control of basalt super-thin fiber mats are presented. The effect of the degree of thermal insulation aging on the increase in the heat flow density is shown.</jats:p

Mathematical modeling of a PV installation for rural electrification

Abstract Since a new Federal Law of the Russian Federation “On Electric Power Industry” has been adopted consumers with microgeneration systems can now sell excess electric energy. Consequently, more agricultural consumers got interested in using renewable energy installations. In this context, the study focuses on mathematical modeling of electricity output by a microgeneration system, in particular with PV panels, to assess the conceivable amount of electric energy that can be eventually sold. The authors built a model of the system tied to a grid for three options: fixed-tilt PV panels, PV panels with a solar tracking system, and concentrator PV systems. The findings analysis confirms that in order to maximize the electricity transmitted to the electric grid, it is rational to use solar energy concentrators with a Sun-tracking system.</jats:p