Guarantee of LNG storage tanks and comprehensive list of low-temperature storage tank models using foreign technology

Description :

　　1、 LNG's

　　1. Select possible storage and transportation materials

　　Liquefied gas has temperature requirements due to its low boiling point and variable phase properties. Only temperatures below the boiling point can ensure the smooth operation of LNG storage and transportation. So for the materials used in storage and transportation equipment, they have temperature resistance and their performance will not change in extremely low temperature environments, which poses a threat to storage.

　　2. Design of LNG storage and transportation equipment

　　Firstly, insulation treatment should be applied to the storage and transportation equipment. Insulation treatment. Gas has a very flammable characteristic. If insulation measures are not taken properly during storage and transportation, it is likely to bring hidden dangers to the storage and transportation work. Proper insulation treatment is necessary to ensure the safety of gas storage and transportation. The commonly used methods in insulation treatment technology include vacuum insulation, vacuum multi air insulation, and so on. In low-temperature storage tanks, vacuum powder insulation can be used.

　　The second is to design sufficient control facilities. Although there are requirements for materials and insulation in storage and transportation, as well as for gas storage and transportation, the pressure in the storage tank increases after gas evaporation, posing a threat to gas storage and transportation. Therefore, the design of gas control measures is an indispensable part.

　　3. Improve the management standards of the LNG industry

　　The storage and transportation of liquefied gas have many characteristics, and industry management standards developed for these characteristics provide regulations for LNG storage and transportation work to follow, and fundamentally solve the chaotic phenomenon in the LNG storage and transportation market. For example, specific regulations should be made for the model and material of transportation equipment for LNG storage tanks, specific requirements should be put forward for the measures of transportation equipment, and solutions for temperature control should be provided. Industry management standards are the fundamental principles for an industry to maintain development, and also an important measure to standardize the LNG storage and transportation industry. It is important to do a good job in industry standards and LNG storage and transportation work.

　　2、 Current Status of Gas Liquid Technology

　　Gas at room temperature is a gas that is difficult to store or transport over long distances. The extracted gas usually needs to undergo "three de" purification treatment, and then undergo liquefaction process. As its main component is methane, the liquefied gas is a low-temperature liquid. Due to the fact that the volume of liquefied gas is only 1/625 of its gaseous state, its transportation and storage efficiency is greatly improved. So far, the mature processes in gas liquefaction technology mainly include expansion mechanism refrigeration, throttling refrigeration, cascade refrigeration, mixed refrigerant refrigeration, and mixed refrigerant refrigeration with pre cooling. At present, liquefied gas plants mostly adopt the latter three liquefaction processes. The United States built an industrial grade liquefied gas plant in 1941. Since the 1960s, the liquefied gas industry has developed, and the scale of liquefied gas storage tanks has been increasing. There has also been research on gas liquefaction technology.

　　The characteristics of gas liquefaction process are large scale, multiple equipment, complex process, and high investment. Most of them adopt staged and mixed refrigerant refrigeration liquefaction process. These two types of liquefaction devices are still in operation, among which the mixed refrigerant refrigeration liquefaction process is the main process considered in the design of new devices. The main purpose of process research is to reduce the energy consumption of gas liquefaction.

　　The French company Axens has researched a gas liquefaction process, which can increase production capacity by 15-20% compared to conventional liquefaction processes, and reduce production costs by 25%. The industrialization of this process has laid the foundation for gas liquefaction. The main advantages of the process are the use of finned heat exchangers and thermodynamically optimized processes, which have been widely recognized worldwide for their environmental, practical, and innovative features.

　　The CII-2 process of gas-liquid transformation has the advantages of simplicity, no phase separation, and easy control of pure component circulation. At the same time, it also has the advantages of good coordination between refrigerant and gas refrigeration temperature, few devices, and high efficiency of mixed refrigerant refrigeration cycle process.

　　A new type of GTL gas liquefaction technology researched in the United States is more suitable for smaller scale gas liquefaction facilities than current GTL liquefaction technology. This new process is much simpler than existing technologies, and does not require the use of synthesis gas. In addition to power generation, oxygen does not need to be used. Its scale, production, and economy are all different from ordinary GTL processes

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• The guarantee of LNG storage tanks and foreign technology