A device to activate lignite and sludge by electro-hydraulic impulse is presented. It comprises an impulse current generator constituted by a high voltage transformer, a high voltage silicon rectifier, a current-limiting resistor, a capacitor bank and an air-break switch, and a lignite and sludge appliance made up of two plane electrodes and a working chamber. The installation activates the lignite or sludge delivered to the working chamber by the impulse current that is from the generator to puncture the main gap in the working chamber, raise the temperature therein up to (20 000 to 40 000) K and the energy density to as high as 109 Jm-3, and form a plasma piston. The alternative development and attenuation of plasma expansion makes the lignite in a number of physical and chemical processes resulting in diverse active radicals and ions, and also breaks it into grains mostly smaller than 250 mm. It is founded by experimental study that the technology can raise the content of nitro-nitrogen by 1.4 to 1.5 times and that of dissoluble organic substances by 5 to 10 times which is probably attributed to the decomposition of the ample germs in the lignite. The calculated power requirement to activate lignite is about (50 to 60) kWht-1. In comparison with muck applied to cucumber cultivation, the activated lignite demonstrates its features as an effective and economical green fertilizer by the same yield with half amount. These findings imply a promising access to green fertilizer.
Comparing with usual continuous jet nozzle, the self-excited oscillation pulsed jet nozzle SEOPJN) can make jet generate a higher peak of pressure and larger scouring volume. And it can make jet increase the effective standoff distance, too. The basic theories of the SEOPJN are introduced.Some experimental results are shown. According to the results, using tricorn bits assembled the SEOPJN to drill oil well, the ROP increases by 8%～77%, and the rates of the footage for tricorn bit increases by 6.7%～44.0%.
