Plasma coupled photo-catalysis method and system for removing ethylene in fresh-keeping storehouse of vegetables and fruits

Abstract

The invention discloses plasma coupled photo-catalysis method and system for removing ethylene in a fresh-keeping storehouse of vegetables and fruits. The method comprises the steps of firstly, generating plasmas by corona discharge to primarily oxidize and degrade ethylene in the fresh-keeping storehouse of vegetables and fruits, and then further oxidizing and degrading the ethylene in the fresh-keeping storehouse of vegetables and fruits by a photocatalyst. The system comprises the fresh-keeping storehouse of vegetables and fruits, a corona discharge plasma coupled photo-catalysis device and a power fan, which are sequentially connected through a gas pipeline in cycle; and a corona discharge plasma reaction unit and a photo-catalysis reaction unit are respectively arranged inside the corona discharge plasma coupled photo-catalysis device. The ethylene in the fresh-keeping storehouse of vegetables and fruits is removed by a method of combining corona discharge plasma coupling and photo-catalysis; the ethylene-containing gas in the fresh-keeping storehouse of vegetables and fruits can be efficiently processed; the concentration of O3 contained in the gas in the fresh-keeping storehouse of vegetables and fruits is effectively reduced; and the ethylene degradation efficiency and the fresh-keeping quality of the vegetables and fruits are greatly improved in comparison with the traditional method.

Description

technical field [0001] The invention relates to the technical field of agricultural product processing and storage, in particular to a plasma-coupled photocatalytic method and system for removing ethylene in a vegetable and fruit fresh-keeping store. Background technique [0002] As a plant hormone, ethylene plays a role in many aspects such as plant growth and aging. When mature horticultural products are stored in a closed space such as a fresh-keeping refrigerator, a large amount of ethylene will be produced due to the wounds of harvesting, peeling, and cutting. The accumulated ethylene is difficult to eliminate, and it is easy to stimulate plants to produce more ethylene. Ethylene accelerates the maturity and aging of plants, and reduces the storage quality and lifespan of fruits, vegetables, flowers, etc. Therefore, if the ethylene concentration can be degraded in the fresh-keeping refrigerator, it is of great significance to the storage effect and quality assurance of...

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Problems solved by technology

However, there are many defects in these methods, such as physical adsorption method, its absorption capacity is limited, desorption is easy to occur, and the effect of removing ethylene is limited; packaging, and it is easy to cause pollution; the catalytic removal of ethylene method used in the controlled atmosphere warehouse, the process of removing ethylene is completed by heating the catalyst and the closed-circuit circulation system, the cost is relatively high, and the refrigeration power requirement is high; although the low-temperature plasma method has The treatment process is short, and it is suitable for handling low-concentration and large-volume gases. However, when used alone, the degradation efficiency of ethylene is affected by the working voltage. Generally, to obtain high degradation efficiency, the working voltage must be increased, which will make it difficult to control the amount of ozone emissions. , will cause some damage to fresh-keeping products; although the photocatalytic method has the advantages of low energy consumption, easy operation and no harmful by-products, it also has low efficiency, difficulty in handling high-concentration and large-volume gases, and the catalyst is easily poisoned and deactivated. and other shortcomings

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