Abstract
When burning any fossil fuels, one of the most harmful combustion products are nitrogen oxides NOx, which damage both the environment and human health in particular. Reduction of NOx emissions from fuel combustion at TPPs plays an important role in reducing the total level of nitrogen oxides NOx emitted into the atmosphere. One way to reduce the concentration of nitrogen oxides NOx is the stepwise combustion of the pulverized coal mixture, in particular the «Overfire Air» technology. The essence of this method is that the main volume of air is fed into the pulverized burners, and the rest of the air is further along the height of the torch through special nozzles. Structurally, the method of stepwise combustion of fuel can be carried out in boilers with a two-tier arrangement of burners along the height of the combustion chamber. In this case, practically no significant reconstruction of the boiler is required, which is associated with additional costs. In the present work, computational experiments on the use of modern overfire air technology (OFA) in the combustion chamber of the PK-39 boiler of the Aksu TPP were carried out and the fields of the main characteristics of heat and mass transfer, as well as the influence of the mass flow of the oxidant through the OFA injectors on the combustion process were obtained.
Highlights
AS OF TODAY Kazakhstan is one of the states possessing a huge stock of hydrocarbons, which render essential influence on formation and a condition of the world energy market [1,2,3].In the Republic of Kazakhstan, about 80% of the country's energy supply comes from the production of electricity by 69 power plants, the main source of which is Kazakh coal [4,5,6].The coal mining in Republic is carried out basically by the open way, which makes this type of solid fuel the cheapest, but low-grade in our country a source of energy [3,7,8]
To solve the systems of differential equations describing the processes of heat and mass transfer in the combustion chamber of the boiler PK-39 of Aksu TPP, the control volume method [6, 18,19,20] was used
Analysis of the figures shows that with the use of overfire air technology (OFA) technology, the combustion process in the central part of the combustion chamber is more intense compared to the base case
Summary
AS OF TODAY Kazakhstan is one of the states possessing a huge stock of hydrocarbons, which render essential influence on formation and a condition of the world energy market [1,2,3]. The most difficult step in realization of the OFA technology is to define the optimal location height and diameter of nozzles through which air will be supplied, and to find the best ratio of air supplying through the main burner and OFAinjectors These characteristics depend on design of the boilers and the method of supplying fuel-air mixture [10,11]. To effectively implement this technology on an industrial boiler, the height of the OFA injectors should be chosen so that in the active combustion zone a complete burn-out of the fuel and its afterburning to the final combustion products are ensured, since incomplete mixing of fuel and oxidant can "This article was presented during the International conference Alternative Energy Sources, Materials & Technologies (AESMT’18), 14 - 15 May, 2018 in Plovdiv, Bulgaria". 218 BALKAN JOURNAL OF ELECTRICAL & COMPUTER ENGINEERING, Vol 6, No 4, October 2018 increase underburning [12]
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