HEJ, HU ISSN 1418-7108 Manuscript no.: ENV-000624-A

Introduction

One of the traditional activities in the field of energetics is the utilization of the energy content of waste fuels. The recovery of the energy content of converter and coke gases of steel works and bio gases of communal waste, which can be used as fuels, should be examined from both a heat technology and an environment protectional point of view, also taking the local utilization possibilities into account.

Besides the utilization of the physical heat of waste gases, their chemical heat needs to be utilized, too. They are used with different types of boilers to generate steam and at the same time there is the possibility of technological heat utilization when it is mixed with gases of high thermal value.

Its utilization as combination gas also makes it necessary to examine how the waste gases change the combustion parameters and polluting effects of natural gas, especially the $NO_x$ formation.

The most important element of combustion methods applied in order to reduce the amount of $NO_x$ is to change combustion temperature, maximum temperatures in the flame, the duration of stay of combustion products in the high temperature zone and the partial pressure of oxygen in the combustion zones. One of the practical measures to achieve these aims is the staged combustion.

HEJ, HU ISSN 1418-7108 Manuscript no.: ENV-000624-A