Development And Application Of Greenhouse Intelligent Antifreeze System In Gobi Area

In recent years,Hexi region has explored a new way to develop modern facility agriculture on the Gobi Desert,implement comprehensive agricultural development on unused land,create medium and hi gh-end agricultural products in artificial facilities,and jump out of traditional farmland to increase farmers’ income.It has achieved the effects of improving agricultural quality and efficiency,increasing farmers’ income and becoming rich,resolving t he multiple effects of food and vegetables competing for land and the relationship between production and ecology.It has brought inspiration for the high-quality development of modern agriculture in resource constrained areas and has a positive demonstrat ion and leading role in the northwest and even the whole country.However,due to the dry and cold weather in Hexi area in winter,the application of solar greenhouse as a modern facility agriculture in the Gobi Desert has encountered the problem of winter frost damage,which restricts the efficient application of solar greenhouse throughout the year.Therefore,this thesis takes the Gobi solar greenhouse in Hexi region as the research object to research and develop antifreezing equipment in accordance with the Gobi solar greenhouse in Hexi region.The main research contents are as follows:(1)Aiming at the problem of frost damage in the solar greenhouse in Gobi region in winter,the idea of solving the problem by developing intelligent anti freezing system equipment of hot air stove based on biomass fuel was put forward.Firstly,the working principle of the intelligent antifreeze system of the greenhouse in the Gobi region is introduced.According to this principle,the overall structure of the antifreeze system equipment of the Gobi solar greenhouse is designed,which uses biomass particles as fuel,concentric shaft double sleeves as furnace body,distributed double circulation as heat dissipation device,and has the functions of automatic ignition,adjustable automatic feeding,and cycle temperature measurement.At the same time,the main functional parts of the overall structure of the greenhouse intelligent antifreeze system are designed,and the core functions of each part are described.(2)The model analysis and calculation are carried out for the hot blast furnace heat exchanger,which is the key component in the research and development of intelligent antifreeze system.Firstly,the heat exchanger is divided into grids and the shell side(air domain)and tube side(flue gas pipe)of the heat exchanger are numerically calculated and analyzed to analyze their velocity distribution,streamline distribution,temperature distribution and pressure distribution.At the same time,the convective heat transfer coefficient,total heat transfer coefficient and total heat transfer capacity of shell side and tube side of heat exchanger are studied under different air inlet velocities.Finally,the numerical analysis results are compared with the actual measured physical quantities.The results are in good agreement with an error of 2%.The reliability of the numerical calculation is verified,which provides theoretical guidance for the design and transformation of the hot air furnace heat exchanger.(3)The control system of the intelligent anti freezing system is designed and the software and hardware of the control system are selected and designed.The real-time monitoring of the environmental temperature change of the solar greenhouse is realized.So as to regulate the temperature increasing and anti freezing device of the biomass hot air stove to achieve automatic burning and automatic feeding.After several prototype trials,we have completed the design and development of the core functions of the biomass hot air stove,such as double sleeve furnace body,double circulation heat dissipation,automatic feeding,automatic ignition,etc.and produced a prototype of the intelligent antifreeze system equipment with automatic control function for the Gobi solar greenhouse.We have demonstrated in the Gobi Ecological Agriculture Industrial Park of Jiuquan Gobi Agricultural Base and surrounding areas.