The results on developing and using a device for preparing liquid fuel blends based on black oil and water mixture are presented. Such blends can be used in steam boilers. Fuel components are mixed sequentially at four stages with the use of jet mixing, swirling, hydrodynamic cavitation, and dispersion. This device was tested for preparing water – black oil blends with different water content when it was incorporated into the fuel system located in the boiler room. Comparison of data on burning the prepared WBOB and commercial black oil М-100 showed that the use of WBOB with a different water content allowed specific fuel saving up to 11% for the tests considered. In addition, analysis of the furnace gases revealed that the total discharge of toxic substances was reduced on the average by 45%. Thus, the WBOB application enables to resolve two important problems: to save hard-to-get liquid fuel and to decrease the anthropogenic impacts on the environment.

Keywords: water – black oil blends, stages of mixing, fuel saving, hydrodynamic treatment