Research On Cold Modeling Experimental Of CWS Burner For Gasification And Development Of New Burner

CWS gasification technology which is called the second coal technology is one of the Clean Coal Use (CCU) technologies. Compared with other CCU technologies, CWS gasification technology which is clean and efficient combustion with low pollution has been listed into the national key project. Gasification nozzle is a key component of gasification facilities. Whether the gasifier's structure match with its air dynamic field or spray field is depends on the nozzle's structure is reasonable or not. Three-channel external mixing type nozzle is widely used in China. But its atomization quality, suitability of the flow field, adaption of load change and life of nozzle still need to be improved. Therefore, it's meaningful to design a nozzle with reasonable structure.First, this paper studies the aerodynamic field of the four-channel nozzles and five-channel nozzles whose cone angle are 30°and 32°. (mark them N1, N2, N3, N4) It investigates on the influence of different structure of the nozzles on several factors such as velocity distribution in gasifer, concentration distribution of trace gases CO, residence time distribution of particles. The text results show that, the flow field in gasifer can divided into three part:jet area, recirculation zone, pipe flow area. The four nozzles'pipe flow areas are same, as big as 39.08% of the total volume of the gasifier. The comparison of four nozzles'volume of recirculation zones is N2>N4>N1>N3, the comparison of reflux quantity is N4>N3>N2>N1. The different nozzles'structures have little effect on the concentration distribution. The residence time of five-channel nozzle is longer than four-channel nozzle.Then, this paper studies the four nozzles'spray fields, it investigates on the influence of different structure of the nozzles on sauter mean diameter (SMD) and spray angle. The experiment's results show that, the SMD become smaller when the distance from nozzle become longer. The spray angle of five-channel nozzle is too small to make the drops be atomized.Finally, the paper studies the spray characteristics of the new gasification nozzle which is my own design based on the summary of text results of the four nozzles as mentioned above. The purpose of atomization experimental is to select a reasonable nozzle from different kinds of nozzles by several indicators such as SMD, spray particle uniformity and spray angle. The nozzle M8 whose length of mixing chamber 1 is 10mm, length of mixing chamber 2 is 24mm, diameter of spout is 24mm is the best nozzle. It has a further spray experiments on the best nozzle.