The invention relates to a spray impregnation vacuum
freeze drying integrated equipment, and also to a corresponding method, belonging to the technical field of food equipment. A U-shaped impregnation liquid delivery
pipe is arranged inside the
freeze drying bin of the equipment, the lower end of which extends from the bottom of the
freeze drying bin and is connected to the impregnation
liquid tank, and the upper end is connected to the
nozzle delivery
pipe, and the
nozzle delivery
pipe is provided with an atomizing
nozzle, and the impregnation liquid is delivered to the atomizing nozzle and sprayed on the surface of the material; at the same time, two groups of
refrigeration systems and
raw water collection systems are arranged, which are respectively connected to the freeze
drying bin through two butterfly valves, and the
butterfly valve is switched so that one group of
refrigeration systems and
raw water collection systems perform freeze
drying refrigeration and
raw water vapor condensation, and the other group performs raw
water ice melting and raw
water collection. The present invention avoids the loss of nutrients by atomizing and spraying the impregnation liquid after vacuum freeze
drying, realizes the pre-drying, vacuum impregnation, freezing, and post-drying processes in one device, greatly improves the
processing efficiency of
dried fruit and vegetable products, and at the same time, the fruit and vegetable raw
water collection system is used to recover the water and
flavor and
pigment substances removed during the vacuum freeze drying process, and realizes the comprehensive utilization of fruit and vegetable raw water and
flavor pigments.