Эксергоэкономическая оптимизация геотермальной когенерационной установки
Abstract
UDC 65.011.46:621
Exergy Economic Optimization of GEOTHERMAL cogeneration plant
V. Kozyrsky, L. Martyniuk, T. Rezakova
With continued growth in fossil fuel prices, including imported, the use of local energy resources that define the low cost of energy, allows you to quickly and reliably provide electricity and heat to various customers. Therefore, cost-effective and efficient solution to this problem is, the creation of co-generation geothermal installations where the primary source of energy for heat and electricity is a natural source of energy (thermal water and gas dissolved in it).
The purpose of research - to develop a method for optimizing power systems for energy and economic characteristics.
Materials and methods of research. Here is an example eksergoekonomicheskoy optimize specific energy system installed in the Crimea. Installation of the geothermal heat power plant (GPP) has been developed on the basis of thermal water and it contains dissolved gas (mostly methane) for heating and power generation, which will provide the base load heating and hot water, independent power supply connected consumers, as well as for its own needs the circulatory system of the geothermal coolant and heating water.
The presence of formation water in large quantities of dissolved gas - a substantially pure methane in addition allows geothermal heat to generate electricity for the own needs of the circulation system, as well as electrical household consumers.
As shown in the diagram of the GPP consists of the following main parts:
well lift, intended for output of productive horizon underground thermal water containing dissolved gas;
training unit of thermal water and natural gas to be used, which includes: the separator (separator), and hydrocyclone unit cleaning and drying gas;
geothermal heat exchanger for heating system water heating systems;
pumps to return the cooled thermal water by pipeline through the injection well in termovodonosny horizon;
gas engine coupled to an electric generator designed to produce electricity necessary for its own needs installation and power supply external customers (Ne = 380.0 kW);
well to return the cooled thermal water.
Calculation of technical indicators is performed on the basis of initial data setting /
Performance installation on the heat covers the base load heating system. Power GPP (380.0 kW) is sufficient to power a group of external users, as well as to satisfy the needs of the circulation system. Such autonomy, ie, Geothermal power plants work independent of external power supplies is an important advantage of the proposed scheme.
Geothermal power plants are characterized by a fairly high technical-economic and operational characteristics.
Optimization of the system under study is determined by the eksergoekonomicheskogo factor, which is composed of exergetic flows and their costs. Thus, finding the value of energy and economic performance of the system in their interdependence.
Comparative analysis by exergy economic optimization study plants and geothermal power plants for cogeneration of electricity supply is made,
These comparisons show that even at the lowest cost gas cost of heat generated by a gas boiler, 2.5 times higher than the cost of heat generated by geothermal cogeneration plant. The production of electricity autonomous gas engines uneconomical.
Conclusions
A conclusion can be drawn from the analysis performed that geothermal cogeneration plants are characterized by high, ie favorable economic indicators. Their use results in a saving of fossil fuels.
If you analyze the option of simultaneous production of electricity and thermal energy, it can be assumed that the preference should be given to geothermal cogeneration installation GPP.
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