A method for the combustion with gas premix and a combustion device for carrying out the method

摘要

PURPOSE:To be able to obtain stable flame and at the same time to reduce NOx by forming a high temperature range that is over the ignition temperature of a premixture gas in the inside of a premixture gas that is jetted out of a nozzle and circulating the combustion gas round the outside of the premixture gas that is jetted from the nozzle. CONSTITUTION:In a first circulating flow region 51 a high temperature combustion gas 4 at nearly 2,000 deg.C that is formed by the combustion of a premixture gas 50 flows. Accordingly the premixture flame that is formed in a secondary combustion chamber 20 gets an ignition source of the high temperature combustion gas 4 and is stabilized. On the other hand, in a second circulation flow region 52 that is formed on the side of the outer circumference of a circular resistor 40 the combustion gas 4 and a premixture gas 5 flow, and the combustion gas 4 and the premixture gas 5 are mixed there to form a combustion mixture gas 6. This combustion mixture gas 6 burns due to the propagation of the flame from the combustion region 53 where the gas burns relatively violently, and outside the relatively violent combustion region 53 a slow combustion region 54 is formed. In the slow combustion region 54 the combus tion mixture gas 6 with a low oxygen partial pressure burns so that the combustion tempera ture is low and the volume of the NOx formed in this region is extremely small.