Study On Dry Cleaning Process And Parameter Control Of Embedded Navigation Light

As the scale of China's air transport business increases,airport traffic is getting larger and larger,and the time required to maintain airport runway lights is getting shorter and shorter.At present,the airport runway lamp cleaning is mainly manual cleaning.With the improvement of cleaning efficiency and environmental protection requirements,the high-efficiency and green cleaning technology has received more and more attention.Dry powder cleaning meets airport runway lamp cleaning requirements and is of concern to the cleaning industry.Based on the analysis of the cause and removal mechanism of embedded runway lamp fouling,this paper deeply studies the cleaning process,proposes the system's dry powder(soda)cleaning program,designs a new nozzle and abrasive valve,optimizes the cleaning process parameters,and proposes safety protection measures.First of all,for the rubber-bonded dirt on the runway lights,only mechanical scraping can be completely removed.Dry powder granules have the ability to scrape dirt,making dry powder cleaning technology the best choice for efficient cleaning of runway lights.Secondly,the system's cleaning program includes cleaning equipment design,abrasive media development,safety protection measures selection,cleaning parameter control and atomization dust reduction.Based on the equipment developed in the early stage,the research focused on the abrasive valve and nozzle structure,and applied Fluent software to analyze the flow field of key components of dry powder cleaning equipment.At the abrasive valve,the DPM model in the multiphase flow is used to simulate the gas-solid mixing flow field inside the abrasive valve.It is found that the abrasive stepped hole has rebound phenomenon,and a structure elimination strategy using excessive taper is proposed.At the nozzle,the same DPM model is used to simulate the gas-solid jet flow field,and the internal and external flow fields of the shrink nozzle,the venturi nozzle and the flat nozzle are analyzed.The pressure field,velocity field,wear and the law of the distribution of abrasive particles.In comparison,it is found that the flat nozzle has a large sprayed nozzle and a venturi nozzle particle distribution area at a jet target distance of 100 mm,and is distributed in a rectangular shape.With a large effective area for cleaning,it has higher cleaning efficiency.Then,for the dry powder cleaning process,simulation analysis and experimental research are carried out.The Fluent software was used to simulate the effects of jet pressure,jet target distance,particle flow rate on cleaning speed and surface erosion rate for flat nozzles.It is concluded that the particle velocity increases with the increase of the injection pressure,and the surface erosion rate decreases with the increase of the jet target distance.The surface erosion rate increases with the increase of the particle flow rate.The effects of injection pressure,jet target distance,particle flow rate on cleaning speed and surface erosion rate were studied by orthogonal test.The test results show that the jet target distance and the injection pressure have a great influence on the cleaning efficiency,the abrasive flow has little influence on the cleaning efficiency,and the optimal combination of factors,that is,The combination of the jet pressure is 0.5 MPa,the jet target distance is 50 mm,and the abrasive flow rate is 4 g/s.Finally,In order to reduce the impact on environmental pollution and human health,a method of water diversion and dust reduction is proposed.Inside the nozzle,the CLSVOF method in Fluent software was used to study the liquid jet crushing process and the fracture position characteristics in the lateral airflow inside the nozzle.On the outside of the nozzle,the atomization state of the nozzle and the atomization dust reduction effect were analyzed by the method of experimental observation.The results of the high-speed camera were used to analyze that the atomization state of the nozzle was uniform at a pressure of 0.5 MPa,and the dust-reducing effect met the requirements.In this paper,the application of baking(soda)dry powder cleaning airport runway lights was studied for the first time in China.The cleaning process was studied in depth by means of simulation analysis and experimental observation.The abrasive valve and nozzle structure were optimized,and the more efficient cleaning process parameters were obtained.It is also proposed to use the method of water diversion and atomization to suppress dust and play a better environmental protection effect.