Hot-air grain drying system for deep waste heat recovery

Abstract

The invention discloses a hot-air grain drying system for deep waste heat recovery. A fire grate is arranged below a hearth, a charging hopper connected with the fire grate is arranged on the side wall of the hearth, a heat exchanger is arranged on the upper portion of the hearth, an induced draft fan communicates with an inner cavity of the hearth, a cooling fan communicates with a drying tower, the drying tower communicates with an air cooler through a pipeline, and the air cooler communicates with the heat exchanger; and the heat exchanger communicates with a hot-air blower, and the outlet of the hot-air blower communicates with the drying tower. The system has the following benefits: air which is discharged from a low-temperature drying section of the drying tower and contains a large amount of water vapor and impurities is creatively and directly fed into the hearth to participate in combustion, the impurities are basically burnt out, and due to the fact that deep waste heat recovery is designed for the heat exchanger, the water vapor can be condensed in the heat exchanger, condensation heat is released, so that the total amount of recovered waste heat is greatly increased; and although the temperature of air exhausted from a cooling section of the drying tower is low, the content of the water vapor and the impurities is low, the air can be directly used as a drying medium to enter the heat exchanger after being slightly filtered, and waste heat recovery and utilization are realized with low equipment investment.

Description

technical field [0001] The invention relates to the technical field of grain drying, in particular to a hot air drying grain system for deep waste heat recovery. Background technique [0002] Food is related to the national destiny and the people's livelihood, and food security is an important basis for national security. This involves three aspects of work: the integrated grain production system, the grain reserve distribution system, and the grain safety management system. Grain drying is an important part of post-production of grain and an extremely important condition for safe storage of grain. In order to reduce field losses and ensure harvest quality, it is generally required to "harvest at the right time", but most of the grain harvested at this time has high moisture content. The mid-to-late rice in the south and the autumn corn in the north have high moisture (moisture can reach more than 30%), and because of the low temperature in autumn, it is difficult to dry m...

AI Technical Summary

Problems solved by technology

[0006] For this reason, the present invention provides a hot air drying grain system with deep waste heat recovery to solve the problem that the air discharged from the drying section of the drying tower in the existing grain drying system contains more water vapor and impurities, and the temperature is not high. The temperature of the air discharged from the cooling section is lower, the recycling technology is difficult, and the economic benefits are not high

Images