Study Of Influence Of Thermal Power Plant’s Cooling Tower Smoke Emission Pattern To Flight Routes

Along with the accelerating process of industrialization, different kinds of thermal power plant projects are growing. The site of some thermal power plant is close to the airport,the thermal power plant cooling tower will discharge tons of smoke into the atmosphere unit time.The rising smoke may create a disturbance to the high altitude air flow field,which affects flight routes, may also alter the atmospheric visibility at the same time. This may threaten the flight safety during taking-off and landing.In order to explore the influence scope and degree of smoke to ensure flight safety,research work was carried out from the two aspects of the airflow field and atmospheric visibility above thermal power plant cooling tower. How cooling tower smoke effect flight path and the atmospheric visibility was analyzed. Influence extent and law were also achieved.Research results can provide data support and theoretical basis for demonstration of flight safety and reliability assessment.In order to verify the validity of the numerical simulation method, the air flow of a existing cooling tower was tested by use of the wind profile radar, corresponding simulation calculation was carried out by using the simulation software at the same time. A comparison between the calculated results and the test data is made to verify the reliability of the calculation method. By using the Lattice Boltzmann method, calculations of air flow distribution over the cooling tower on certain climatic conditions were carried out. The influence of the smoke lift to the force of the aircraft is analyzed. The theoretical calculation of the atmospheric visibility over different height of cooling tower was carried out according to the relevant climate conditions. The influence of visibility on flight safety is discussed.The study results show that: At the same height of the cooling tower under summer and winter conditions, smoke lifting height of the former is greater than the latter, In the same season, the higher the cooling tower, the higher the height of the smoke. Gas concentration near the outlet of cooling tower is the highest. Under the influence of natural wind, the hot air flow will move downward and gradually diffuses in the rising process. The hot air will absorb a large amount of air and form a large number of different vortex structures, even form back flow locally, which has an impact on wind speed and direction, concentration and temperature distribution. The vertical acceleration of direction under the maximum wind load has little effect on the aircraft. The lateral unit area of the wind load is generally small and has weak impact on the aircraft. When the aircraft flies 400m above the cooling tower. The wind load caused by the emission of smoke is very small. In summer, cooling tower smoke doesn’t affect the visibility of the airplane. In winter, if the airplane passes by the cooling tower during its taking- off and landing, the flight height of the airplane might as well be over 350m.