Process Design and Microwave Non destructive Testing Technology for LNG Storage Tanks

1、 When designing low-temperature storage tanks for LNG gasification stations, certain corresponding equipment is combined for operation to maintain the overall structural stability. The following analysis is mainly based on the actual situation. 1. The design of LNG storage tanks (1) Determination of LNG storage tank form Currently, the form of LNG storage tanks is closely related to their storage capacity and also inseparable from the storage space. When selecting low-temperature storage tanks, most of the liquefied natural growth gas low-temperature storage tanks in China do not have significant advantages. When selecting tank drainage, low-temperature equipment should be used as much as possible. In addition, comprehensive consideration should be given to storage temperature and operating efficiency. (2) The determination of design pressure and calculation pressure is based on the analysis of the pressure that the storage tank can withstand. The pressure of the storage tank should not exceed 0.8 MPa, otherwise it will easily cause temperature changes. At the same time, the structure of the storage tank is determined by the magnitude of the pressure it can withstand, and analysis needs to be conducted on the basis of isolating the air pressure. The application of the storage tank should isolate the surrounding heat sources and pressure. 2. When designing a turbocharger, the pressure on the storage tank should be taken into account. When carrying out low-temperature treatment, the pressurization system of the low-temperature container should be combined to protect the use of a constant temperature gasifier under constant temperature conditions. A pressurized design should be adopted to carry out corresponding treatment work. If under natural environmental conditions, the design of the gasifier needs to take into account changes in the climate environment and the operation treatment of natural growth gas temperature, and carry out a pressurized design. If the temperature of the vaporizer remains constant, it should be controlled in conjunction with high-pressure temperature design to reduce the impact of climate conditions and provide important protection for the operation of the water bath type booster. 3. Combining the design of pressure regulation, metering, and odorizing devices with LNG gas supply stations, reasonable equipment for regulating pressure changes is adopted to control the command pressure. Based on automated regulation, simple air pressure is provided for corresponding construction operations through metering operations and the use of odorants, facilitating the discharge of odorous gases into natural gas pipelines. 2、 The microwave non-destructive testing technology for LNG storage tanks began in the 1960s. Microwave non-destructive testing technology is a technique that irradiates electromagnetic waves with a certain frequency range of GHzMHz3300-330 onto the tested object. Liquefied natural growth gas storage tanks analyze the amplitude and phase changes of reflected and transmitted waves, changes in wave modes, and analyze scattered waves to understand defects such as cracks, fissures, and pores in the tested sample, as well as the location and size of delamination and inclusions in layered media, and the degree of uneven density inside composite materials. Microwave non-destructive testing technology can be mainly divided into three categories according to the detection principle: reflected wave method, transmitted wave method, and scattered wave method. Due to the characteristics of microwaves, such as their short wavelength, high frequency, and good ability to penetrate dielectric materials, microwave non-destructive testing can perform non-destructive scanning of LNG storage tanks and provide data to quantify defect areas; Especially without special analysis and processing, real-time 3D images of defect areas can be obtained. Its advantages include simple instrument, easy operation, convenient portability, low cost, and no need for coupling agents in microwave applications, avoiding contamination of materials by coupling agents. Its limitation is that microwaves cannot penetrate metals and composite materials with good conductivity, so it can only be used to detect surface crack defects and roughness of storage tank metals, and cannot detect internal defects of such composite structures.