[mathematical modeling of graduate students in Jiangxi Province in 2022] analysis and code implementation of haze removal by nucleation of water vapor supersaturation

1 subject

smog , It's a combination of fog and haze . In many regions of China, fog is combined with haze as a disastrous weather phenomenon for early warning and prediction , Collectively referred to as “ Haze weather ”. Haze is the result of interaction between specific climatic conditions and human activities . The economic and social activities of high density population will inevitably discharge a lot of fine particles （PM 2.5）, Once the emission exceeds the atmospheric circulation capacity and carrying capacity , The concentration of fine particles will continue to build up , At this time, if it is affected by static and stable weather , It is very easy to have a large range of haze .

There are reports , China's largest 500 In the city , Only less than 1% Our cities meet the air quality standards recommended by the World Health Organization , meanwhile , The most polluted in the world 10 A city has 7 One in China . 2014 year 1 month 4 Japan , National disaster reduction Office 、 For the first time, the Ministry of Civil Affairs has included haze weather, which is harmful to health 2013 Report the natural disasters in .

   2014 year 2 month , During his inspection in Beijing, he pointed out ： Dealing with haze pollution 、 The primary task of improving air quality is to control PM2.5, We should reduce coal consumption 、 Strictly control the car 、 Adjust industry 、 Strengthen management 、 Joint defense and joint control 、 Take major measures to govern according to law , Focus on key areas , Strict index assessment , Strengthen environmental law enforcement and supervision , Conscientiously pursue responsibility .

    Water vapor method is the most common method on the construction site 、 The most economical way to remove dust and haze , It's easy .  This method is usually called the nuclear haze removal method with supersaturated water vapor .  The process is as follows ：

   1.  Ultra fine gas is generated through the spray system - Water mist ： Ultramicro gas - Water mist is of particle size spectrum distribution D50 Less than 15 micron 、D90 Less than 25 Micron mist .  among ,D50 Value means 50% The particle size of the above water particles is 15 Below microns , in question D90 Value means 90% The particle size of the above water particles is 25 Below microns .

   2.  Will be ultra micro gas - Water mist is sprayed into the atmospheric environment , Through the cooling process, the atmospheric environment with haze particles as the core forms supersaturation and condensation 10 Particles larger than microns .

   3.  The spray system is a single-phase high-pressure nozzle 、 gas - Liquid two-phase nozzle 、 One or more of bubble atomizing nozzle or ultrasonic atomizing nozzle are mixed .

   4.  The cooling process is natural cooling 、 Ultramicro gas - One or more of water mist evaporation cooling or artificial spraying refrigerant cooling .

    Now we invite your team to be the technical consultant , Help the environmental protection department to complete the technical reserve and application of haze removal .  Please help the environmental protection department to complete ：

  1.  Analyze the key characteristics of the input of the nozzle and the ultra-fine gas ejected - Characteristics of water mist , Establish a model to study single-phase high-pressure nozzle 、 gas - Characteristics and distribution of water vapor particles emitted by the spray system corresponding to the liquid-phase nozzle .

  2.  Analyze the regularity of the dynamic process of the combination of water vapor and haze , Please give the relationship between the effect of haze removal and the characteristics and distribution of water vapor particles ;

  3.  Please collect the corresponding data , Evaluate your haze removal technology , Verify the rationality and feasibility of your technology .

  4.  Please write a copy no more than 1 Page of non-technical report , Report your achievements to the leaders of the environmental protection department . 

2 Analytical thinking

Pre sale in progress ： Question 3 Vapor nuclear haze
Release time 2022 year 7 month 4 At 6 p.m. on the th , Neither the old nor the young will be cheated
Open to booking 20, After release 25

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