USE OF THE REBURNING TECHNOLOGY WITH BIOMASS PYROLYSIS PRODUCTS AS A REBURNING FUEL TO REDUCE EMISSIONS OF NITROGEN OXIDES FROM TPP 312 BOILER

Abstract

In Ukraine, a three-stage coal combustion system fueled by a natural gas as a reburning fuel for nitrogen oxides emission reduction was mounted on Unit № 4 of the Ladyzhyn TPP. This system was developed in cooperation with Combustion Engineering (USA), VTI (Russia) and the Gas Institute of the National Academy of Sciences of Ukraine and was assembled by the Ladyzhyn TPP staff in 1992. The test runs of this system had confirmed the effectiveness of this method of reducing emissions of nitrogen oxides into the atmosphere (up to 50%).Unfortunately, due to the high price of natural gas and the introduction of limits on its use, currently the use of natural gas as a fuel for reburning is impossible. One of the possible ways to reduce emissions of nitrogen oxides from the coal-fired boiler TPP 312 is the operation of Reburning technology with the biomass pyrolysis product as reburning fuel. The aim of the work was to evaluate the possibility of the application the biomass pyrolysis products as a reburning fuel in Reburning technology to reduce nitrogen oxides from the coal-fired boiler TPP 312. For this purpose, a detailed computer model of a standard TPP 312 boiler and a TPP 312 boiler with a coal reburning combustion system was developed and built. The study of the operation the Reburning coal combustion system, which is mounted on the unit №4 DTEK Ladyzhynska TPP, on the design parameters of the operation for the boiler load of 280 MWe was carried out. It was determinate that the supply of reburning fuel at 12% of the total heat capacity of the boiler gives a good level of the reduction of nitrogen oxides (up to 25%), provides no slag conditions for superheater pipes and does not lead to increase of the fuel losses with unburnt carbon.