A modified atmosphere fresh-keeping transportation system and control method for fruits and vegetables

Abstract

The invention discloses a fruit and vegetable atmosphere-controlled fresh-keeping transportation system and a control method thereof, and the oxygen content in a van body is reduced by means of direct liquid nitrogen injection; oxygen-rich gas is discharged from the airtight van body through an exhaust solenoid valve at the same time as liquid nitrogen injection so as to realize the rapid reduction of the oxygen content in the van body; a central liquid nitrogen injection atmosphere-controlled platform is adopted, and one central liquid nitrogen injection atmosphere-controlled platform can beused in multiple economical intelligent atmosphere-controlled fresh-keeping transportation vehicles; not only the oxygen reduction speed is high, but also the cost is greatly reduced; a humidifying system is installed, which controls the humidity of the van body; a drainage system is installed, which starts a drainage device by a temperature controller, timely discharges accumulated water generated during the fruit and vegetable respiration, the temperature control process and the humidification process, and reduces pathogen propagation; a ventilation system is installed, and a double fan mode is adopted; when the differences of ambient temperature, humidity and oxygen concentration in the van are large, the fans are started to reduce the temperature difference, humidity difference, and oxygen concentration difference.

Description

technical field [0001] The invention relates to the field of food fresh-keeping transportation, in particular to a controlled-atmosphere fresh-keeping transportation system for fruits and vegetables and a control method thereof. Background technique [0002] Fruit and vegetable fresh-keeping transportation is an important measure to ensure the quality of fruits and vegetables, reduce fruit and vegetable rot and increase farmers' income. Due to the imperfect cold chain logistics of fruits and vegetables in our country, about 75 billion yuan of fruit and vegetable output value is lost in rot every year in our country. With the increasing requirements of consumers on food safety and food quality, it is urgent to improve the quality of fruits and vegetables, reduce the decay of fruits and vegetables, and realize the long-distance preservation and transportation of fruits and vegetables. [0003] Factors affecting the quality of fresh-keeping transportation of fruits and vegetabl...

AI Technical Summary

Problems solved by technology

The initial investment cost of the modified atmosphere system for nitrogen production is high, the work is stable, and it can be adjusted in real time according to the change of the ambient atmosphere composition, but the oxygen reduction speed is slow, so it is suitable for long-distance transportation, especially sea transportation

The cost of its own controlled atmosphere system is low and the operation is simple, but the fresh-keeping effect is not good and the requirements for the sealing of the fruit and vegetable storage environment are high

The controlled atmosphere filling system is flexible in operation and can quickly reduce oxygen, but the long-term operating cost is higher than that of the nitrogen-producing controlled atmosphere system, and it has high requirements for the sealing of the fresh-keeping environment of fruits and vegetables

The ozone-conditioning system has the effect of air conditioning and sterilization, but it is only effective for individual fruits and vegetables, and the cost is too high

[0006] At present, foreign controlled atmosphere systems generally have the characteristics of slow oxygen reduction time, high cost of controlled atmosphere equipment or unsatisfactory effect of controlled atmosphere, which are not suitable for the national conditions of domestic transportation in my country.

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