PRACTICE OF OPERATION OF EXPANDER-GENERATOR UNITS AT MOSENERGO CHPPS. HISTORICAL OVERVIEW

In European countries, the expander technology has found application at some facilities. It consists in producing electricity and/or cold using the so-called expander-generator units (EGU). These units are designed to use natural gas (NG) overpressure fed to the facility. For example, in Germany, a number of such smaller plants are in operation, each having the capacity of an order of hundreds of kilowatts. What makes such plants advantageous for their owners is that, these can obtain allowances established by the German law in addition to the cost of electricity produced in the EGU released to consumers. In Russia, an interest in such units arose after Mosenergo built a power-generating complex made up of two 5 MW EGUs at CHPP-21 in 1994. In the years following its commissioning, diff erent authors held studies (mostly, of theoretical nature) of the eff ects of EGU on the technical and economic parameters of facilities, where they can be installed, including thermal power plants and CHP plants, boiler rooms, gas supply systems, as standalone facilities and in combination with heat pumps, air compressors, turbines, etc. The results were published in a large number of articles and defended in theses. Still, of the greatest interest for the power industry is the generalization of the results of research and the record of operation of EGU at CHPP-21 of Mosenergo, where the prototypes of this equipment were installed. To this eff ect, the authors of this paper undertake to present an overview of publications prepared by diff erent researchers over the years and published in a variety of power engineering journals. The generalization of the test results and operating record indicates the absence of an eff ect of introduction of EGU in the heat circuit of the CHPP on the latter’s thermal effi ciency and proves the futility of using EGU in the Russian energy sector, as evidenced by the fact that Mosenergo eventually rejected further use of EGU in its system.

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