Energy-saving drying method for keeping quality of grain

Abstract

The invention discloses an energy-saving drying method for keeping the quality of grain. The drying method comprises the steps of drying in a segmenting and layering way by means of transverse flow; absorbing the energy of hot air wholly absorbed by grain by increasing the thickness of a grain layer through which the hot air passes, prolonging the contact time between the hot air and the grain, and enhancing the heat energy exchange effect; introducing the dry hot air which is discharged out of a hot air drying section and a grain temperature cooling section and has a certain drying capability into a waste heat drying section to carry out the waste heat drying; discharging the waste gas which is approximate to be saturated out of the waste heat drying section, thus fully utilizing the heat energy. Therefore, the un-buffered fast and continuous drying of the grain can be realized, the grain drying and heating time can be shortened, and the ascending range of the fatty acid value can be reduced.

Description

technical field [0001] The invention relates to a grain drying technology, in particular to a quality-preserving and energy-saving drying method for grain, oil crops and planting grain. Background technique [0002] Grain is the primary issue of the national economy and the people's livelihood, and the drying technology of grain is the key to ensure the safe storage of grain. The current domestic grain drying treatment methods have the following defects: First, the slow-suction process is generally used, and the heating time of grain is too long, generally at 8 -16 hours, long-term heating will cause the fatty acid value of the grain to increase and the quality to decline, so the slow drying process is strictly prohibited for oil drying. The second is that the temperature of the hot air is too high. The temperature of the hot air for drying corn in the northern provinces is 120-180°C, which causes the dried corn to be partially burnt, protein and starch are denatured, and th...

AI Technical Summary

Problems solved by technology

[0002] Grain is the primary issue of the national economy and the people's livelihood, and the drying technology of grain is the key to ensure the safe storage of grain. The current domestic grain drying treatment methods have the following defects: First, the slow-suction process is generally used, and the heating time of grain is too long, generally at 8 -16 hours, long-term heating will cause the fatty acid value of the grain to increase and the quality to decline, so it is strictly forbidden to use the slow-suction process for oil drying

The second is that the temperature of the hot air is too high. The temperature of the hot air for corn drying in northern provinces is 120-180°C, which causes the dried corn to be burnt, protein and starch denatured, and the internal quality deteriorated.

The third is that the energy consumption is too high. For grain dryers, the national standard energy consumption is 8000-8500KJ / kg (H 2 0), the actual energy consumption is 8500-10000KJ / kg (H 2 0), the energy consumption loss of the hot blast stove is 30%, the energy consumption loss of the dryer is 30-35%, and the total energy consumption utilization rate is only about 35%. The waste caused by the direct discharge of hot and dry air with a certain drying capacity