Energy and ecological assessment of gas burning boiler equipment

Abstract

The scope of shown problems in the paper is devoted to energy and environmental assessment of industrial gas burning installations equipped with jet-niche combustion technology (JNT). The basic principles underlying this technology include: rational distribution of fuel in the oxidant stream; stable adjustable structure of fuel, oxidant and combustion products; self-regulation of the composition of the fuel mixture in the zone of torch stabilization when changing the load of the unit. As of today, a large number of industrial gas-burning equipment has been modernized by jet-niche technology, including: boilers, furnaces, dryers, metallurgical facilities, etc. The results of industrial implementation of the burning technology allowed to accumulate a significant amount of technical information and provided an opportunity for preliminary environmental assessment during the modernization of gas-burning unit (GBU). As practice shows, at the present stage the main direction of improving the technology is to improve its environmental performance. The influence of the main mode and technical parameters of GBU on its emission indicators is established in the paper. Possibilities for reduction of nitrogen oxides by primary technological methods have been identified, the simplest and most effective of which is the introduction of recirculation gases into the furnace space. The data obtained from the results of the analysis emission indicators of the modernized GBU with a capacity of 0.5-60 MW help estimate the emission rate low and medium power boilers depending on the main influencing factors, namely the unit size, excess air ratio and boiler load. The effect of the introduction of recirculation gases into the furnace space on the level of nitrogen oxides concentration is also taken into account. The efficiency of application of the scheme of recirculation gases introduction into the primary air flow in comparison with combustion technologies based on vortex burners is shown. According to the results of the industrial experiment, the energy efficiency of the proposed measures was established on the example of the dependences of efficiency on the load of boilers PTVM-50 and KVGM-20.