Test method and device based on research on mechanism and effect of pesticide thermal fume atomization

Abstract

The invention relates to a test method and a visual test device based on the research on the mechanism and effect of thermal fuming atomization of pesticides, including an engine, a thermal fuming atomization tube and a cooling tube device, a flow regulating device, a temperature detection device, a thermal fuming atomization The exit speed detection device of chemical tube, the detection device of thermal smoke atomization process of liquid medicine and the detection device of droplet particle size distribution. During the test, the fuel consumption rate is changed by adjusting the fuel supply of the engine, so that the combustion exhaust gas has different kinetic energy and heat energy. Continuous chemical liquid flow thermal fuming atomization, cracking, evaporation and condensation to form smoke process, droplet particle size distribution, axial temperature distribution of thermal fuming atomization tube and outlet velocity test, to realize the test of oil solvent The test function of the thermal smoke effect of liquid medicine, the thermal atomization effect of water-based liquid medicine and the influence of the cooling tube on the temperature of the heat smoke atomizer tube.

Description

technical field [0001] The invention relates to a visual thermal fume atomization test method and device, which are used for visual testing based on the research on the mechanism and effect of pesticide thermal fume atomization and atomization, and belong to the technical field of testing equipment for spraying and spraying smoke in agriculture, forestry or plant protection. Background technique [0002] Spray or smoke equipment is commonly used in the prevention and control of agricultural and forestry pests and diseases. The performance of its fume and atomization largely determines the effective use of pesticides and the level of control efficiency. Hot smoke drug-loaded control technology is the most effective method in the prevention and control of agricultural and forestry diseases and insect pests. It uses a hot smoke generator to thermally smoke oil-solvent pesticides into fine smoke with a particle size of less than 50um; There are four kinds of spraying machines wi...

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Problems solved by technology

[0003] When the hot fog machine is working, the high-temperature and high-speed airflow ejected from the outlet of the nozzle drives the air in the annular passage between the cooling pipe and the nozzle to eject out of the cooling pipe together, thereby forming a partial vacuum, so that the external cold air flows from the cooling pipe. The inlet is automatically sucked in, and a continuous cold air flow is formed between the cooling pipe and the nozzle to cool the nozzle; the temperature of the nozzle not only determines the smoke effect of the liquid medicine, but also affects the service life of the device. If the temperature is too low, the chemical solution will not be able to achieve complete thermal fuming, and the large mist droplets formed cannot diffuse in the air and settle directly to the ground, resulting in waste of pesticides; if the temperature is too high, the chemical solution will be decomposed by heat and lose its efficacy , it is also easy to cause pesticide smoke to burn, and the combustion chamber-nozzle is burned and burned through; therefore, it is very important to study the influence of the cooling pipe on the temperature of the nozzle and the thermal fuming effect of the liquid medicine

[0004] Generally, the liquid medicine sprayed by the sprayer is a water-based liquid medicine, which is made by directly diluting the pesticide stock solution in water according to a certain proportion, and using the direct spray method, the droplet size is generally between 100 and 300 μm, and the droplet is suspended , Diffusion, diffusion and penetration are weak, and the control efficiency is low

The aerosol agent released by the hot fog machine is generally an oil solvent liquid, which is made by mixing and diluting the pesticide stock solution and solvent oil in an appropriate ratio. The solvent oil is generally No. 0 diesel oil; the particle size of the smoke droplets is generally 51 μm when spraying. Left and right, the particle size of water mist droplets is about 50 μm; however, during the growth period of orchard fruits, the mist droplets have strong adhesion and anti-scouring ability, and will adhere to the surface of the fruit for a long time, seriously affecting the taste and food safety of the fruit; in some indoor or In closed places, the oil-soluble mist droplets have strong dispersibility and weak evaporation, and are easy to adhere to the walls and the surface of objects, causing serious pollution to the environment and objects; therefore, in view of the above problems, water mist spraying should be selected for pest control

Since the specific heat capacity of the water-based liquid medicine is about twice that of the oil-solvent liquid medicine, that is, when the same amount of water-based liquid medicine and oil-solvent medicine liquid are heated to the same temperature, the heat required by the former is about twice that of the latter. Therefore, most of the existing hot fog machines cannot completely thermally atomize the water-based liquid medicine, and many large droplets will be sprayed directly from the outlet of the nozzle or flow or drip from the outlet of the nozzle. The research on the thermal atomization effect of liquid medicine is of great significance to the development and application of hot water fog machines

[0005] Since the position of the drug nozzle on the nozzle and the heat of the combustion exhaust gas play a crucial role in the effect of the smoke and atomization of the drug liquid, there are many studies on the working mechanism of the thermal fog machine or engine at home and abroad, but the cooling tube There are few researches on the effect of nozzle temperature and the thermal atomization effect of liquid medicine, and there are few visual test devices for thermal smoke of oil solvent liquid medicine and water-based liquid medicine thermal atomization effect, which are almost blank. The plant protection equipment with the functions of spraying smoke and spraying water mist is of great significance to improve the efficiency of pest control in orchards or closed places. The precise grasp has laid the foundation for the design of a high-efficiency smoke and water mist machine

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