COMBINED STEAM AND GAS TURBINE POWER UNIT WITH MAGNETIC HYDRODYNAMIC INSERT

Abstract

A possible way out of the critical state of existing thermal power generation facilities of Ukrainian IPS (Integrated Power System) is seen in their refurbishment with combined steam and gas turbine power units, especially with those operating on solid fuel. Solid fuel, namely ground coal is burned according to scheme from an additional cyclone extended furnace sequentially connected to the main furnace using atmospheric air enriched with oxygen. Atmospheric air is enriched with oxygen by means of membrane air separators to the concentration of up to 40% vol.
 The peculiarity of the proposed power unit is presence of a magnetic hydrodynamic insert, which is located in the additional furnace sequentially connected to the main furnace, the additional furnace is made with a double cooling jacket. Heated air and coal dust is mixed in the additional furnace inlet to form a working fluid for MHD generation. After passing the area of nets and crown electrodes, the charged particles, flying at high speed past the extracting nets, reach a collector where positive charge is accumulated. This charge is essentially the electromotive force of MHD generator, the bigger part of voltage goes on load resistance and smaller part comes to crown electrodes.
 Due to the increased oxygen content, the flare temperature increases, approaching 2700-3000 0C, and due to a much smaller amount of nitrogen, formation of nitrogen oxides is decreased. This reaction is endothermic, which explains increase of the flare temperature, and therefore, increase of thermal efficiency of the furnace.
 The amount of generated electricity is increased due to the work of the magnetic hydrodynamic insert, while amount of coal burned is not changed. Along with the increase of overall efficiency, the emissions of formed nitrogen oxides are decreased, which improves environmental situation in the power unit location.