Academic literature on the topic 'Mini-CHP'

This article discusses the principles of organization and operation of mini-CHP plants on local fuels (LF) to the conditions of hydrogen and carbon-free energy. The analysis of literary sources on the current state of development of mini-CHP plants on LF in the structure of the country's energy balance revealed a number of issues related to their operation and construction that arose after the commissioning of the Belarusian NPP. It is noted that a potential way to develop such energy sources is to switch to multi-purpose product development based on the principles of operation of the energy hub, which will potentially reduce the dependence of the energy source on the operation of the Unified Energy System (UES). The analysis of open literature sources on the potential role of LF in the transition to carbon-free energy was carried out. In this context, the operation of a mini-CHP plant on LF is considered according to two scenarios, viz. recovery of CO2 from combustion products, followed by purification to food grade and sale to direct consumers, as well as changing the operating modes of the energy source by means of the accumulation of excess electrical energy in the form of hydrogen during the operation of a mini-CHP plant in accordance with the thermal load of consumers. Based on archival data from an operating wood chip-fueled mini-CHP with an ORC module that was selected for research as an analog object, an assessment of the economic conditions for the development of mini-CHP plants on LF was made when integrating food-grade CO2 extraction units or for the production and accumulation of hydrogen into their schemes. For food grade carbon dioxide production systems, a functional dependency has been built that allows for a preliminary estimate of the value of the simple payback period when integrated into the scheme. Under the accepted conditions for the study object, the simple payback period obtained using the built dependency was less than 3 years. For systems of accumulation of excess electrical energy in the form of hydrogen, 3 options of the organization of work were considered. Based on the research object, the presence of boundary conditions for the ratio of the minimum and maximum differentiated tariff for the purchase of electric energy of the UES has been determined, under which it is advisable to further consider the economic indicators of the project for integrating a module for accumulating electric energy in the form of hydrogen into the scheme of a mini-CHP plant on LP.

The article studies the concept of an active energy complex in accordance with the legal documentation. The ways of implementing AEC as an element of distributed generation for industrial consumers are considered. An example of implementation of the described system on a real object is studied. The technical and economic efficiency and prospects for the development of the project are analyzed. When calculating the economic component, a comparison was made of the total costs for the purchase of electricity from the sales campaign and the implementation of own generation. The results from the introduction of AEC at the enterprise were evaluated.

One of the promising directions of small-scale distributed power generation for Russia is the use of biomass. The present work is devoted to studies of an mini-CHP based on multi-stage biomass gasification. Mathematical models of elements and mini-CHP in general based on technological schemes were constructed. The mathematical models were constructed with the software developed at Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences. The calculations were made for two sizes of internal combustion engines. Thus, we obtained the values of flow rates, temperatures of heat carriers at various points of flow charts of the plants.

The paper presents the results of a study to determine the rational structure of mini-CHP (Cogeneration Heat and Power Plant) using local fuels types (LFT) for operation as part of the United Energy System (UES) of Belarus with a surplus of electricity generating capacity and dominance of imported types of energy resources (natural gas and nuclear fuel) in the fuel balance. When optimizing the operating modes of mini-CHPs using LFT and operating in parallel with the UES, which has a significant surplus of electricity generating capacity, it is necessary to separate options for existing stations and options for newly built ones. In the first case, due to the fact that the power of the equipment is known, it is advisable to consider two extreme options, i.e., the operation of the heating unit according to an electrical or thermal load schedule. In this case, in order to maintain the daily consumption traffic it is necessary to provide for the accumulation of thermal or electrical energy, respectively. In the case of new construction, the optimized parameter is the power of the generating equipment, so it is advisable to give preference to the option with the maximum number of hours of use of the rated power. In order to increase the economic attractiveness of mini-CHP, options for developing the structure of mini-CHP using LFT with the transition to multi-generation technologies and adaptation to the existing operating conditions of the UES of Belarus have been considered. The results of an analysis of commercially available technologies for storing excess electrical energy are presented in accordance with current and projected (until 2030) cost and operational indicators. For adapting mini-CHP to operate in the UES in conditions of a surplus of electrical power capacity, an electrical energy storage system using hydrogen as an intermediate energy carrier is of greatest interest. To utilize the excess electrical energy consumption from a mini-CHP with a heating ORC unit during the daily dips, a structural diagram configuration using an alkaline electrolysis module for hydrogen production is proposed. The efficiency of energy storage and use technology is considered depending on the specific energy intensity for various electrical energy storage technologies. The use of the two most energy-intensive energy storage technologies is proposed: accumulation based on electrochemical batte-ries and the “electricity-hydrogen” type. During the study, an analysis of the functioning of the ORC-installation Turboden 14 CHP ORC-installation operating as part of a mini-CHP using LFT was carried out. It was revealed that today the installation operates in a wide range of load changes (from 17 to 87 % of the rated electrical power), while the generation of electrical energy from thermal consumption varied in the range from 0.20 to 0.026 MW/MW. Due to the fact that the ORC installation under study is a component of the energy source with a high installed peak thermal power, in the current state there is no direct correlation between the outside air temperature and the generation power of the ORC installation. This circumstance indicates the need to continue the study of heat load trends to build functional models for short- and medium-term forecasting of heat load depending on the time of day and average hourly outside air temperature, which was implemented in the second part of the work.