Drying system and method for fruit and vegetable slices by utilizing exhaust steam heat of residual heat recovery system

Abstract

The invention relates to a drying system and method for fruit and vegetable slices by utilizing exhaust steam heat of a residual heat recovery system, and belongs to the field of energy saving. The system comprises a drying box (2), a first condenser (4), a first turbine (5), a gas-liquid separator (6), a compressor (7), a feed pump (11), an evaporator (12), a second turbine (14), a preheater (16) and a second condenser (17). According to the system, recovery of residual heat is coupled with drying of fruits and vegetables together, so that graded utilization of heat energy is realized, and the drying system can be used for drying the fruits and vegetables while outputting mechanical work outwards; low-temperature condensation water (9) separated from condensation and expanding from the drying system can enable condensation pressure in the residual heat recovery system to be reduced, so that the output work of the second turbine (14) is increased. A heat source (13) of the system can be low grade heat, such as sunlight heat, geothermal heat, industrial flue gas waste heat, steam waste heat and the like.

Description

technical field [0001] The invention relates to a drying system and method for fruit and vegetable slices using the exhausted steam heat of a waste heat recovery system, and belongs to the field of energy saving. technical background [0002] The diversified processing of fruits and vegetables is one of the economic pillars of some areas rich in fruits and vegetables, among which dehydration and drying is one of the main links. Infrared drying technology. These drying methods all use coal and electricity as the driving force. Hot air drying consumes a lot of energy and damages heat-sensitive nutrients, such as vitamins and volatile flavor substances. Although freeze drying and vacuum microwave drying can overcome the shortcomings of hot air drying, their equipment investment is large and energy consumption is high. High and low batch processing volume, resulting in a substantial increase in unit production costs, which is difficult for ordinary fruit and vegetable processi...

AI Technical Summary

Problems solved by technology

Hot air drying consumes a lot of energy and damages heat-sensitive nutrients, such as vitamins and volatile flavor substances. Although freeze drying and vacuum microwave drying can overcome the shortcomings of hot air drying, their equipment investment is large and energy consumption is high. High and low batch processing volume, resulting in a substantial increase in unit production costs, which is difficult for general fruit and vegetable processing enterprises to bear

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