The Influence Of Nozzle Structure For The Gas-solid Two-phase Flow Distribution In Cyclone Gasifier

Coal gasification as a core technology for coal utilization, is the energy field’s hot talk all the time, gasifier as a core coal technic equipment, through has gone through a long development, it also remains problems like nozzl e burnt and water wall burn out, it has influence in the normal operation of the gasifier.In view of the existing problems of gasifier type, In this paper, we talk about the dry pulverized coal cyclone gasification technology, Through single-phase test, two phase test lab at the same time, visualization methods for different nozzle at the top of the nozzle structure and wall decorate a form of the gas-solid two-phase flow field in the cyclone furnace for experimental research, get the optimal gas-solid flow field distribution, aimed at resolving a gasifier nozzle burnt and wall loss problem, at the same time improve the gasification performance, in order to design structures, the cold test bench, and to meet the experimental conditions on the particle imag ing velocimetry(PIV) has carried on the debugging and parameter setting. Using PIV particle image velocimeter, using dc nozzle and injector of primary air vortex nozzle structure and different arrangement of secondary air nozzle under gas-solid two-phase flow field inside the furnace is measured, research under different working conditions, the gas-solid two phase flow field in the cyclone furnace flow pattern. Analysis of different primary air nozzles at different positions of secondary air arrangement structure and the influence of gas solid two phase flow characteristics inside the furnace, the cyclone gasifier provide reference and basis for further design research.This paper analyzed the primary air nozzle adopts dc nozzle structure, to change secondary air nozzle layout position of gas-solid two-phase flow field inside the furnace distribution, and compare the secondary air nozzle location in L/D =1.0, 1.2, it is concluded that secondary air inlet position between L/D=0.8~1.0 and more close to L/D = 1.0, In furnace is not concentric to the relatively large section of the tangential velocity distribution along the axial velocity and attenuation is small, can form stable rotating flow field.Then by studying the primary air nozzle structure of swirl noz zle. Primary air vane of different perspectives and different position when the layout of the secondary air, the gas-solid two-phase flow field in the cyclone furnace of distribution, it is concluded that when primary air nozzle using vortex structure, secondary air arrangement position at L/D =1.0, in furnace is not concentric to the relatively large section of the tangential velocity distribution, the gas phase dynamic field is better, compare the secondary air at the incident position at L/D =1.0, primary air vane Angle of 40 ° and 60 ° furnace flow field distribution of solid phase,it is concluded that primary air vane Angle 60 ° flow field inside the furnace center reflux area is larger,the average tangential velocity is larger.At last, by gas-solid rotation of the primary air DC nozzle and swirl type type two best condition comparative analysis, the top nozzle Swirl structure more conducive to the establishment of large central recirculation in the furnace area, high speed peripherals flow field, but for the impact of the cyclone gasification furnace performance, need for further verification.