Research And Application Of Large-scale Insect Breeding Environmental Technology

With the strengthening of environmental protection awareness and the development of green agriculture,biological control technologies based on the release of natural enemy insects are gradually emerging.In view of the urgent need for green pest control in major industries such as tobacco and tea in Guizhou Province,this paper develops a large-scale insect breeding climate chamber,which provides ideal culture conditions for large-scale natural enemy insect breeding.This paper aims at the large-scale demonstration and application requirements of the climate chamber of an insect breeding base in Guizhou Province,according to the strict requirements of large-scale breeding and cultivation for the complex environment,the whole-to-part modular design method is used to study the design of artificial environment refrigeration and heating scheme for enemy insects,the design of combined enclosure structure for insect breeding environment chamber,numerical simulation of environmental parameters of breeding process,optimization design of thermal control box structure,etc.Through the investigation and analysis,theoretical calculations,simulation,parameter performance experiments and other process technology to complete the design and development of the climate chamber.The main research contents and conclusions of this paper are as follows:(1)Carry out investigation and analysis overall structural design.By consulting relevant literature and technical materials at home and abroad,inspecting the situation on the ground and feasibility analysis,the thermal load analysis of the climate chamber is carried out to determine the maximum cooling capacity and heating capacity of the climate chamber according to the performance index of the climate chamber.By studying the mainstream heating and cooling methods,comprehensive consideration of the use requirements of the climate chamber to determine the appropriate overall plan.(2)Design and optimize the air supply structure of the climate chamber.Based on the cooling demand of cooling and heating,the porous medium model is used to establish the equivalent model of the air supply mode of the indoor thin-walled orifice plate and the air supply mode of the filter.By comparing and analyzing the rectification characteristics of the two,the indoor filter air supply mode is selected because the rectification effect is better and the air supply pressure difference can be greatly reduced.Optimize the design of the air supply mode of the filter to achieve a reasonable arrangement of the throttle plate to effectively improve the uniformity of the air supply.Based on the uniform demand of indoor air supply,the characteristics of the supply flow field of the external short-range air supply mode and the medium-range air supply mode are compared.It is found that the medium-range air supply mode provides more uniform air supply.Therefore,the external medium-range air supply mode is chosen and the air supply performance is further improved by optimizing the local structure.(3)Research on factors affecting indoor temperature distribution.By comparing and analyzing the influence of the position design of different return air outlets on the temperature field,determine the reasonable return air position to avoid the temperature stratification caused by the temperature difference buoyancy in the case of a single air return.By comparing the effects of different soil thicknesses on the temperature distribution,it was found that the high heat flux fraction was fully included when the soil range was 2 m;The fluid temperature on the surface of the cement board with a soil range of 4 m differs from the surface fluid temperature value of the cement board at a soil range of 2 m by 0.03 ?.The soil is determined to have a range of 2 m.At this time,the simulation has high precision.According to the research objectives,The distribution of indoor temperature field and flow field in summer and winter is analyzed separately when the supply speed is 1.231m/s and the supply fluctuation is 1.1m/s and 1.36m/s,make sure that the technical indicators related to it meet the requirements.(4)Optimize the structure of the design control box and its flow field characteristics.The airflow resistance model of the evaporator is established by using porous media;The effect of the arrangement parameters of the circular heating wire on the maximum solid temperature of the heating wire under the fixed power is studied.The results show that for the 8mm circular heating wire,when the separation factor is less than 0.5,the penetration pressure difference of the airflow will increase sharply;The maximum temperature value of the heating wire is linear with the multiple of the separation and the volumetric power consumption.Under the same volume,when the multiple of the separation is 0.5,the 1 mm thick ribbon heating wire can reduce the maximum temperature of the solid compared to the 5 mm circular heating wire.By analyzing the temperature distribution of the heating wire,it is determined that the distance between the heating wire and the evaporator is 100 mm is suitable.Comparing and analyzing the influence of the opening angle ? of the spherical diffuser on the penetration wind speed of the working elements in the control box,it is found that the wind speed distribution of the heating wire and the evaporator surface is the most uniform when ? is 90°.(5)Carry out sample room construction and test its performance parameters for the climate chamber;Through the test and analysis of the main performance parameters of the constructed climate chamber,the rationality of the climate chamber design is verified,and a new scheme for the design of the large space insect breeding climate chamber is provided.