TWO-STAGE COMBUSTION METHOD OF GASEOUS HYDROCARBON FUEL AND DEVICE FOR REALISATION THEREOF Russian patent published in 2009 - IPC F23C13/06 F23D14/18 

FIELD: power engineering.

SUBSTANCE: two-stage combustion method of gaseous hydrocarbon fuel involves as follows: first of all, catalytic agent is heated, then at the first stage there performed is partial catalytic oxydation of hydrocarbon fuel using heated catalytic agent thus obtaining synthesis gas that containes hydrogen and carbon monoxide and that is mixed with additional air at the second stage. At the second stage in combustion zone, there performed is flame combustion of obtained synthesis gas mixed with air; at that overall excess air factor is provided in relation to stoichiometric one in the range equal to α=0.6÷3. At the first stage all the gaseous hydrocarbon fuel is supplied to partial catalytic oxydation channel. Gaseous hydrocarbon fuel mixed with air, which passes via partial catalytic oxydation channel, is defined from "fuel/air" ratio in the range equal to 1:2.8 ÷ 1:3. Synthesis gas leaving partial catalytic oxydation channel, and additional air for obtaining homogeneous combustible mixture, are supplied to combustion zone in the form of opposite annular coaxial jets respectively. Catalytic agent is heated up to temperature of 400°÷650°C owing to combustion product heat after catalytic agent in gas direction. In order to carry out combustion process, ignition of gaseous hydrocarbon fuel mixed with air is performed; at that ratio of volume of the above mixture to stoichiometric air volume is chosen within the following range: 1.05÷1.2. Gaseous hydrocarbon fuel mixed with air is ignited with electrical spark or glower plug, and controlled with flame scanner. At ignition, excess air factor is provided with additional air. Generated heat power value is varied by changing the quantity of gaseous hydrocarbon fuel and air, which are supplied to the first and second combustion stages. Porous material consisting of active components, such as rhodium, nickel, platinum, palladium, ferrum, cobalt, rhenium, ruthenium, or their mixtures, is used as catalytic agent.

EFFECT: invention allows reducing emission of hazardous substances to ambient air thus providing almost total absence of carbon oxide and nitrogen oxides in exit gases.

14 cl, 1 dwg