ISSUES OF EFFECTIVE USE OF LAND-FILLS’ LAND RESOURCES AT THE FINAL STAGE OF THEIR LIFE CYCLE

The article is focused on the justification of the practicability of involvement of the re-sources from solid waste landfills in the eco-nomic circulation. A large number of landfills located on the territory of Russia have prac-tically exhausted their resources as waste disposal facilities; however, they can be used to obtain secondary energy resources even at the final stage of their life cycle. The optimization model presented by the authors makes it possible to develop an action plan for the phased creation of a biogas collection system based on the zoning of land plots and calculating the return on capital from their use. As an example, the landfill of solid waste "Severnaya Samarka" in the Lenin-grad region is considered.

Features of application of ORC-technology at compressor stations of metallurgical enterprises

The use of secondary energy resources in metallurgy with their conversion into mechanical and / or electrical energy allows not only to reduce the negative impact on the environment, but also to significantly increase the energy efficiency of facilities. As a result the study design, the results of which are presented in this article defined the energy-saving potential at the compressor station metallurgical enterprises (on the example of the system of supply of technical gases of the process of production of rolled steel from iron ore PJSC Magnitogorsk Iron and Steel Works). A schematic solution and a method for determining the operating parameters of an installation operating according to the so-called "organic Rankine cycle" (ORC installation), which allows obtaining additional electrical energy for production needs by utilizing the heat of interstage cooling of compressor units, are proposed and justified. The features of the implementation of this technology are identified, and the working substance of the ORC installation that meets the requirements of safety and energy efficiency as much as possible is proposed for implementation. The values of the internal efficiency, the power of the ORC installation and the share of usefully utilized heat in the implementation of the proposed scheme are estimated.

Power supply of industrial and residential urban areas through the use of secondary combustible and thermal energy resources

The subject at hand is the technology of integrated use of secondary combustible and thermal energy resources of oil refining and petrochemicals for power supply and heat supply of industrial and residential urban areas. Currently, combustible secondary energy resources in petrochemicals in through hydrocarbon gases are burned in smokeless flares and technological candles without practical use in the electric and thermal energy industry. In the production of polyethylene, an average of 230 t/h of spent combustible gases is burned in a smokeless flare at an altitude of 105 m with useless dispersion of the resulting heat in the atmosphere. The heat of heated process water during cooling in cooling towers is uselessly dispersed in the atmosphere or leaves with contaminated spillways and non-return condensate into settling tanks without practical useful application. In the construction of new and the energy supply of existing industrial and residential facilities, there is a problem providing them with electric and thermal energy at low prices. The purpose of this study is to develop a technical solution on the technology of integrated use of secondary combustible and thermal energy resources of oil refining and petrochemicals for the electrical and thermal supply of industrial and residential urban areas.

Expander-generator set for utilization of natural gas overpressure energy

The article deals with the problem of using secondary energy resources in the system of transportation and distribution of natural gas, and the possibility of generating electricity without burning fuel by reducing high-pressure natural gas at gas distribution stations. The analysis of the influence of the gas temperature at the entrance to the expander - generator unit, as well as the dependence of the power of the expander - generator unit on the gas temperature and the temperature of the low-potential source is presented. Optimal temperatures are obtained at which the power of the expander-generator unit is maximal for the given gas parameters.

Modeling an effective method to utilize secondary energy resources of a combined cycle gas turbine based on the CCGT-420T

Nowadays, improving the efficiency of power plants by utilizing secondary energy resources is gaining more attention in the energy sector. In this paper, the combined cycle gas turbine (CCGT-420T) was considered, where exhaust heat from the main and auxiliary equipment is utilized, and sent to a water supply system through a closed-circuit heat exchanger, as a result, the heat transferred ( Q 6.4 MW) is rejected into the environment through a cooling tower. Moreover, an effective modelling method for utilizing heat in a closed cycle, using a steam compressing heat pump unit (HPU) is proposed. In addition, a calculation of the effectiveness of utilizing secondary energy resources depending on the number of HPU stages. In addition, the calculation of the effectiveness of the use of secondary energy resources depending on the number of stages of HPU was carried out. Several options of the model were discussed in this work, such as, two-, three-, and four-stage HPU and the coefficient of performance was calculated. Moreover, the work of these compressors for each option of the model was discussed in this work. Finally, the economic benefits of using of a multi-stage HPU instead of a traditional one-stage HPU during the annual operation of the CCGT-420T was discussed.

MODELING AN EFFECTIVE SOLUTION FOR THE UTILIZATION OF SECONDARY ENERGY RESOURCES OF CCGT UNIT ON THE EXAMPLE OF CCGT-420T CHPP-16

Nowadays, improving the efficiency of power plants by utilizing secondary energy resources is gaining more attention in the energy sector. In this paper, the combined cycle gas turbine (CCGT-420T) was considered, where exhaust heat from the main and auxiliary equipment is utilized, and sent to a water supply system through a closed-circuit heat exchanger, as a result, the heat transferred (Q = 6.4 MW) is rejected into the environment through a cooling tower. Moreover, an effective modelling method for utilizing heat in a closed cycle, using a steam compressing heat pump unit (HPU) is proposed. In addition, a calculation of the effectiveness of utilizing secondary energy resources depending on the number of HPU stages.

Application of an absorption heat pump in the conditions of an existing combined heat and power plant

The dependence of mankind on energy resources only increases with the development of scientific and technological progress. It is clear that the supply of natural energy resources will run out soon. The solution is using new energy generation technologies based on renewable and secondary sources. Due to the presence in Ukraine of operating combined heat and power plants, there is the possibility of producing thermal energy using the secondary heat by absorption heat pumps. At the same time, the thermal energy of flue gases and steam from steam turbines does not heat the atmosphere, but are involved in the generation of thermal energy for heating networks of settlements. Due to the ability of the absorbent solution to absorb and condense water vapor under the influence of low-potential and high-potential heat carriers, it is possible to significantly reduce the consumption of traditional energy resources and increase the overall efficiency of the combined heat and power plants. World experience shows that the use of secondary energy resources can significantly improve the country's energy balance. And the main problem is the availability of these resources. In today's changing climate, the use of renewable energy sources requires additional expences and it is appropriate to pay attention to use of present secondary energy resources, which are not used now. There are a lot of such resources available in heat generating facilities. This is especially noticeable in large cities with central heating networks. Therefore, increasing the efficiency of their work makes it possible to significantly improve the energy balance of the whole country and reduce tariffs for thermal energy for industry and individual consumers, which, in turn, will improve the living standards of citizens.