Try to shorten the liquid supply and return air pipe and reduce the elbow; properly increase the liquid supply pipe diameter and reduce the pressure loss, which is the premise to ensure that the quick freezing device can work normally at low temperature and full load. When the author had carried out technical transformation on several quick-freezing plants, the above measures were taken to significantly improve the cooling effect. Care should be taken to increase the diameter of the liquid supply pipe to make the liquid supply smooth. However, when the frost is applied, the drainage is increased by the liquid supply pipe, and the drainage effect is affected. Some of the liquid and oil 112 rows are not clean, so the oil pipe must be attached to the bottom of the evaporator.
Strictly close to the latest national standards for the installation and acceptance of the installation of refrigeration systems. Beginning this year, local labor and quality supervision departments will take strict measures on the construction of pressure pipelines to prevent accidents in pressure vessels and pressure pipelines. Full implementation of GB5027498 "Industrial Metal Pipeline Engineering Construction and Acceptance Specifications". The new specification has new regulations for the installation of refrigeration water-cooled screw unit systems. For example, 10% X-ray inspection of pipes below 29 °C, the fixed welding head shall not be less than 40% of the inspection quantity. Low temperature requirements refrigeration pipeline should have better pipe and welding quality. In order to make the system meet the new requirements, first of all, in the new construction or renovation project, there should be drawings of the pressure piping design qualification design institute. Secondly, in addition to the general cold storage construction permit, the installation company should have the qualification of pressure pipeline construction. The welder should have a welder certificate for the pressure vessel and piping. The pipe end slope angle should be used before welding (using a beveling machine). The first welding uses hydrogen arc welding to make the bottom, and only in strict accordance with the construction specification procedures can ensure the safe operation of the refrigeration system. To this end, these information cooling peers should be given enough attention. Once it is found that there is no map, unlicensed construction or unqualified construction, the relevant departments will order the removal or fine.
Many domestic frozen products are exported to foreign countries. The commodity value of the product is high, and one ton of export-conditioned food is about 10,000 yuan. One ton of frozen roast slices is worth more than 100,000. When the 50-ton cold storage is full, the total value of the goods is more than 60,000, and it is required to be stored at a low temperature below 2 °C. A slight fluctuation in the temperature of the cold storage will have a direct impact on the quality of the high value product. Therefore, if the original cold storage design specification of 18 ° C is not able to meet the requirements of frozen foods to a low temperature storage requirements. At the beginning of this year, it was designed and constructed according to a 25 °C storage temperature in the 50-ton cold storage of Cixi Xulong Industrial. Take 20 cm polyurethane insulation soil construction library, increase refrigeration capacity and cold storage evaporation area, supply liquid supply pipe according to multi-channel access principle, rely on automatic temperature measurement system to ensure that cold storage can run at constant low temperature. It has been running at a constant temperature of around 30 °C, and high-value frozen foods have a reliable storage environment.
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