The influence factor analyses of non-stable combustion in the ignition process of gasifier

摘要

The pulverized coal gasification technology is largescale carried out in China for more than ten years.and more and more coal gasification technology,such as SCGP,GSP,GE,indigenous gasifier,have been widely used in China. Ignition process is non-stable combustion process.which is the key process in the operation of gasifier.In ignition process of pulverized coal gasifier, the average temperature and pressure will increase to high level (about 800 ℃ and IMPa) from the normal condition. In this paper, the trial furnace experiment have been carried out to study the non-stable flow and combustion characteristics in gasifier. The variety of the temperature and the shape of the flame with the pressure growing have been analyzed. These results show that the average temperature is increasing gradually at atmosphere pressure,while the high temperature region locates 100 mm away from the head of the ignition burner with a spindly shape.As the pressure goes up, the shapes of the flame shorten apparently,while the distance between the high temperature region and the head of the start-up burner decreases. Thereby,it is possible that the head of the start-up-burner will burning-out by the high temperature flame. Therefore, the pressure will tremendously influence the combustion process in gasifier,where the flame will change shortly and unstably.