Use 95% to 98% pure nitrogen produced by the nitrogen generator to replace (dilute) the gas in the air-conditioning storehouse and reduce the concentration of oxygen in the storehouse. It can also be used to eliminate excessive carbon dioxide, ethylene, or other in the small air-conditioning storehouse. gas. At present, there are two types of nitrogen-dividing machine used in the air-conditioning warehouse: carbon-dividing molecular sieve physical adsorption and hollow fiber membrane separation, both using air as raw material. The former utilizes different molecular adsorption rates of oxygen and nitrogen molecules in the carbon molecular sieves of the two towers, absorbs oxygen under reduced pressure, decompresses oxygen through continuous decompression, and continuously converts nitrogen into nitrogen in the two towers. The latter is made of polymer materials. The hollow fiber membrane has a series of advantages such as simple structure, easy operation, fast nitrogen production speed, no wearing parts, small size, light weight, low noise, etc. It is a novel and efficient nitrogen production equipment. The common hollow fiber membrane nitrogen generator consists of three parts: an air compressor, an air tank, and a membrane nitrogen generator. Figure 2 Hollow fiber membrane nitrogen system The heart of the nitrogen machine is the hollow fiber membrane group. It consists of tens of thousands or even hundreds of thousands of hollow fibers with a diameter of 50-500 μm and is bundled into bundles. The two ends are impregnated with epoxy resin to form a membrane filter and placed in a shell. When the compressed air passes through the hollow fiber, the oxygen and water vapor pass through the membrane at a high rate, and the oxygen-enriched air is released into the atmosphere. Most of the nitrogen gas remains in the membrane due to the slow rate of permeation through the membrane, resulting in higher purity. The product gas, the purity can be adjusted using the purity control valve, the higher the purity, the smaller the flow. Air compressor air supply pressure is generally 1.0 ~ 1.2Mpa, oil content is less than 3PPm. The nitrogen generator itself has a three-stage filtration system. The filtered compressed air requires oil content of less than 0.01 ppm and dust particles of less than 0.01 μm. A large number of nitrogen generators for an air-conditioned storage tank must first be considered to meet the oxygen reduction requirement of the largest air-conditioning in the library, that is, after the fruit is put into storage, the air-conditioning parameter requirements are reached within 1 to 3 days. To take into account the total number of libraries and the total capacity. The main technical parameters of the CA series hollow fiber membrane generator made by Tianjin Senluo are shown in Table 1. Table 1 CA Series Nitrogen Generator Selection Table Type 95% Nitrogen Flow m3/h Interface Diameter Dimensions Weight Type A Type B Rich Gas Condensate Others CA10 10 G3/4′′ G1/2′′ G1/2′′ 70 60 196 140CA15 15 170CA20 20 180CA30 30 190CA45 45 G3/4′′ 80 60 196 200CA60 60 250 CA75 75 G1′′ G1′′ 80 70 196 280 (1) In the model: A—oxygen-containing display panel B—without oxygen display panel. At present, the nitrogen-making machine generally adopts an open substitution (dilution) method to fill the nitrogen between the atmospheres, and 95% to 97% of the purity nitrogen is injected from the upper air inlet between the atmospheres, and the replaced gas comes from the intake air. The exhaust ports arranged diagonally on the mouth are discharged into the atmosphere. The whole process is a dynamic process of constant dilution, and the oxygen content in the reservoir falls down to natural logarithms until it reaches the specified target. Tianjin Senluo Technology Development Co., Ltd. http:// E-mail: Telephone Fax Company Name Tianjin Senluo Technology Development Co., Ltd.
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