| In further response to Heilongjiang Province's proposal to build a world-class modern livestock industry in the Songnun Plain in response to the rapid development of the Jiuzan Administration of the Northern Wilderness Group.Adhering to the principle of equal emphasis on quantity and quality,the production and processing of high quality alfalfa is one of the measures needed to increase milk production and increase economic benefits.Whenever the harvest of alfalfa coincides with the rainy season,changes in weather conditions are prone to mold or rot,which leads to a decline in quality and loss of nutrients.In order to reduce storage losses of alfalfa,the combined drying method using far-infrared hot air is characterized by low production costs,high drying efficiency,and high nutrient retention rate.In this paper,the influence of various factors on the drying process of alfalfa grass and its change law were studied.The best drying process parameters were determined,which provided technical support for the actual production.In response to the problem of large alfalfa harvest in the north and the decline of storage quality in the rainy season,alfalfa planted by Yinluo Dairy was used as the test material,and the far-infrared hot air combination drying experimental bench was used to study the influence of drying characteristics and quality of alfalfa bales to improve the quality of alfalfa bales and economic benefits of commercial forage in the northeast.Firstly,a single-factor experimental design was used to explore the effects of hot air temperature,bale density,alfalfa bale length and distance between infrared heating plate and bale on the drying characteristics of alfalfa bales using a far-infrared combined drying test bench with sensory score as the evaluation index.Its experiments proved that: the length of the bale,the distance from the infrared heating plate to the bale and the hot air temperature have great influence on the drying characteristics of the bale,the shorter the length of the bale,the closer the distance from the infrared heating plate to the bale,the higher the hot air temperature,the shorter its drying time;the greater the density of the bale,the slower the drying efficiency.Secondly,combining with the results of single-factor test,the material-bearing mechanism and the opening degree of radiation adjusting plate of the pilot test bench were improved to determine the reasonable structural parameters of the far-infrared hot air circulation drying experimental device.On the basis of its original drying experimental bench,the design and innovation of the rotating drying material-bearing mechanism were elaborated.The rotating dryer mechanism uses the principle of four-bar mechanism to make its planes rotate in parallel,so that each bale receives the same radiation area and wind speed.Then a three-factor five-level orthogonal rotary test method will be carried out on the alfalfa small square bales using the improved pilot test bench to obtain the optimal drying process parameters.To provide a technical basis for solving the drying and storage of high quality forage in Heilongjiang region.Through the multi-factor orthogonal rotary combination test,the protein preservation rate and sensory score were used as evaluation indexes,and the results were analyzed and processed by design expert and other software,and the optimal combination of drying process parameters for alfalfa bales was obtained: hot air temperature of 74?,hot air temperature of 74.55?,bale density of 150kg/m3,wind speed of 1.7m/s,protein preservation The protein content was21.11% and the sensory score was 98.92.Under these process parameters,the drying of alfalfa bales could improve the protein preservation rate and the perception score. |
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