Abstract
The paper considers the issue of improving the factory power plant energy efficiency. The literature review was carried out, which presents domestic scientific works. The analysis results of the current state of power plant energy efficiency in the country are presented. It is revealed that one of the main factors reducing the power plant energy efficiency is the consumption of electricity for their own needs. In order to reduce the electricity consumption by own needs, it is proposed to use the principle of cascade-frequency regulation to control the pumps group. Feed pumps of a factory power plant with feed water cross-links were selected as the research object. An example of the four feed pump operation on a common collector with the condition of maintaining the necessary water flow at a given network pressure is considered. Instead of traditional throttling, it is proposed to regulate the pump performance by changing the drive rotation speed. This reduces the consumption of electrical energy. A distinctive feature of the proposed control scheme is that part of the pumps necessary to maintain a given feed water flow rate are connected to the single frequency converter. The regulation takes place with the same rotation speed. To bring the pump into nominal operation mode, a workaround is provided that allows you to connect the electric drive directly to the mains. A flowchart for choosing the optimal operating mode for a group of similar pumps has been developed. For a given network characteristic, various options for connecting pumps via frequency converters and their resulting characteristics are obtained. The operation expediency of a pump group with different frequency and load when working on a common network is considered. Recommendations have been developed for the use of frequency-controlled noses, taking into account the minimum costs for the given performance.
Keywords
power plant, efficiency improvement, self-consumption, throttling, adjustable drive, frequency converter, feed pumps, power saving
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