THE INFLUENCE OF HYDROGEN ENRICHED GAS INJECTION UPON SOX EMISSIONS COMING FROM A 1 MW PULVERIZED COAL PILOT FURNACE

摘要

The current paper aims at presenting some research outcomes concerning the effects of the use of hydrogen enriched gas injection into the mixture stream of pulverized coal and the primary air upon the SO_x pollutant emissions of a 1 MW pulverized coal pilot furnace. The authors have used an experimental method to study the effects of this procedure upon a 1 MW pilot furnace specially designed to burn pulverized solid fuel within the range between lignite and peat coal. The hydrogen enriched gas is a dried one, produced by an electrolytic system still under the patent of the authors. This electrolytic system is a dynamic one, keeping the fluid in a permanent flow, producing a quasi- stoechiometric gaseous mixture of hydrogen and oxygen. This gas is then injected inside the feeding pipe of a pulverized coal burner, at a certain distance from the combustion chamber. Working at half thermal load of the furnace, the following conditions have been achieved with/without hydrogen enriched gas: flue gas temperature at the end of the furnace 920/910 oC; and the flame flue gas mean composition: sulfur dioxide 942.3/1670.6 ppm at an oxygen concentration of 8.06/3.42 %; for all these experiments, only Romanian lignite of Rovinari (0.98% total sulphur content at the initial standing) has been tested. Primary conclusions concerning these results are focused upon the quick diffusion of hydrogen within the coal particles in comparison with oxygen and its stable combination with the sulfur and other elements from the sterile content. A chemical analysis of the sludge components is also presented in the paper.