Low-temperature circulation dryer for crop seeds

Abstract

The invention discloses a low-temperature circulation dryer for crop seeds, which comprises a dryer body, a hoister, a draught fan, a hot-blast furnace, a heat exchanger, small air inflow angle boxes, air exhaust angle boxes, air inflow angle boxes, a grain discharge device, a delivery machine under the dryer and a grain-moisture and drying-temperature on-line detector. The low-temperature circulation dryer solves the problems of uneven material drying, higher energy consumption, a low annual utilization rate and the like in the prior art effectively, and has the characteristics of simple structure, simplicity in operation, high applicability, high-quality, efficient, safe and energy-saving low-temperature quick drying and the like.

Description

technical field [0001] The invention relates to grain drying equipment technology, specifically a low-temperature circulation dryer for crop seeds that adopts an air-induced mode to increase the grain drying rate and reduce the grain drying temperature. Background technique [0002] Timely drying of crop seeds after harvest is the key to ensuring their germination rate, germination potential, and preventing germplasm deterioration. Traditionally, the more economical and practical method is ventilated drying. For dry crop seeds, the temperature below 41°C is called low-temperature drying. [0003] From the point of view of the way of ventilation and drying, it is nothing more than two forms of blasting and drafting. The biggest problem with the blowing method is that the drying medium in the drying layer is under positive pressure. Positive pressure ventilation, when the pressure of the drying medium increases, its relative humidity must increase simultaneously, which virtua...

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Problems solved by technology

Positive pressure ventilation, when the pressure of the drying medium increases, its relative humidity must increase simultaneously, which virtually reduces the ability of the drying medium (hot air) to absorb moisture. When the drying operation is improper, the material at the air inlet end is often dry and The phenomenon of moisture absorption at the exhaust end is not only uneven drying but also relatively high drying temperature and low drying rate; induced air negative pressure drying can effectively avoid the phenomenon of moisture absorption of materials at the exhaust end, but in terms of technical implementation, the current drying The air inlet end and the air outlet end of the equipment cannot be arranged in the same adjacent position, and the drying is achieved by cross-flow drying. The drying temperature of the air inlet end is much higher than that of the air outlet end. In this way, there are not only large The temperature gradient causes uneven drying of materials, and at the same time, the pressure loss when the drying medium passes through the drying layer is very large, and the energy consumption is high.

Moreover, there is a problem of residual seeds in the grain discharge section of the existing dryers, it is difficult to clear the tower, and the versatility is poor, resulting in a significant reduction in the annual utilization rate of the dryer. This is also one of the key issues that is difficult to popularize and promote seed mechanized drying technology

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