As we all know, the use of air blower is very wide, such as environmental protection water treatment, folding machine, indentation machine, paper cutter, glass products, air transport and so on. Today, Shoupu Electrical and Mechanical Co., Ltd. will introduce the feasibility of using high-pressure fan to ventilate and cool soybean in winter and to treat local fever.
The storage experience in recent years shows that the ventilation uniformity of soybean in winter is generally lower than that of wheat and maize. Especially when soybean is stored in shallow silos, there are obvious regional differences in the range and speed of cooling. Usually, the central blanking point (in the range of 3 m in diameter), not only the ventilation cooling rate is slow, but also the uniformity of cooling, the range of cooling, the temperature and moisture gradient after ventilation cooling are obviously lower than those in other areas. The above parts are the key parts which cause local heating in summer. The ventilation and cooling effect of these parts is directly related to the safety of whole storage soybean in summer. Therefore, exploring an effective ventilation mode has become a major problem in soybean storage. For this reason, combined with the storage characteristics of soybeans, the central grain reserve directly under Xinshagang, Guangdong Province, tried to use 15KW high-pressure fan for comprehensive cooling treatment, and achieved remarkable results, which laid a low-temperature foundation for the safety of soybeans in summer and long-term storage.
Materials and methods
1. Test warehouse
In this experiment, 48 warehouses were selected as test warehouses and 41 warehouses as control warehouses. They are all shallow round warehouses constructed by the national debt project of 50 billion kg in 1998. The diameter of the warehouses is 25.0 m, the height of the stockpiled grain is 15.6 m, and the designed storage capacity is 6500 t. The basic situation of each warehouse is shown in Table 1.
2. Test equipment
15 kW high-pressure centrifugal fan, 11 kw medium-pressure centrifugal fan, local single-pipe ventilation unit, ventilation hose, grain condition detection system and so on. The related parameters of the above two centrifugal fans are shown in Table 2.
The total ventilation energy consumption of No. 48 silo is 4794 kW h, the unit energy consumption is 0.063 kW h /(t); the total energy consumption of No. 41 silo is 6570 kW h, and the unit energy consumption is 0.086 kW h /(t). According to the Technical Regulations for Mechanical Ventilation of Grain Storage, the unit energy consumption of ventilation in cooling groove should not be higher than 0.075 kW h /(t). According to the above data analysis, the No. 48 warehouse is ventilated by 15 kW high-pressure fan, and its unit energy consumption is 0.063 kW h /(C t), which meets the requirements of Technical Regulations for Ventilation of Grain Storage Machinery. However, the unit energy consumption of No. 41 silo is relatively high due to the use of 11 kw centrifugal fan for ventilation in the early stage. In summary, the use of high-pressure fan to ventilate the soybean warehouse has a good overall cooling effect, and energy consumption can basically meet the requirements of "Technical Regulations for Mechanical Ventilation of Grain Storage", which has a good application prospect.
1. When the ventilation uniformity of soybean warehouse is poor, the overall cooling effect can be significantly improved by using air blower. The main manifestation is that the area with poor local ventilation during the ventilation process is small or not, and the degree of abnormality is weak or the duration is very short.
2. Under the same operating cost, the abnormal fever caused by impurity aggregation in the center can be solved by using air blower to a large extent. Therefore, it is suggested that the configuration of high-pressure centrifugal fan should be properly increased in soybean storage to lay a foundation for the safe storage of soybean.
3. Considering the particularity of ventilation and cooling in soybean warehouse, the use of high-pressure fan will result in relatively high energy consumption per unit of cooling operation, but it can basically meet the requirements of "Technical Regulations for Mechanical Ventilation of Grain Storage".