Automatic precooling system and precooling method for LNG storage tank based on efficient communication

Abstract

The invention provides an automatic pre-cooling system and a pre-cooling method for LNG storage tanks based on high-efficiency communication. The CFD numerical simulation module is used to simulate the pre-cooling process and provide initial flow parameters for the pre-cooling process; the storage tank is installed and monitored in a modular manner. Points, using 5G technology to realize the signal transmission between each sensor in the pre-cooling system and the integrated operation platform; the present invention is based on the integrated operation platform to limit the temperature drop rate, thermal stress, temperature difference between two adjacent points, inner tank pressure and other parameters The monitoring results are compared and analyzed with the limit value, and then the electric control valve module and the frequency conversion pump module are automatically adjusted to realize the adjustment of the delivery flow of the pre-cooling medium and ensure the stable and safe pre-cooling process. The invention can realize automatic, integrated and integrated control of the pre-cooling process, without long-term arrangement of monitoring personnel at the monitoring point, avoiding potential safety hazards, saving manpower and material resources, more precise pre-cooling control, and high pre-cooling efficiency.

Description

technical field [0001] The invention belongs to the technical field of LNG storage tank precooling, and in particular relates to an automatic precooling system and a precooling method for an LNG storage tank based on high-efficiency communication. Background technique [0002] LNG storage tank refers to a storage tank specially used to store liquefied natural gas, liquefied natural gas referred to as LNG. For LNG storage tanks, when low-temperature liquid suddenly flows into the normal temperature pipeline, the pipeline will shrink rapidly, the bottom of the pipeline is in direct contact with the low-temperature LNG, and the top temperature is higher, which will cause the "banana effect" of the pipeline, so the LNG storage tank needs to be inspected Pre-cool. [0003] In the current pre-cooling process, the initial parameters of pre-cooling usually use empirical data, which is poorly adaptable to different types of storage tanks, and reasonable parameters cannot be determin...

AI Technical Summary

Problems solved by technology

[0003] In the current pre-cooling process, the initial parameters of pre-cooling usually use empirical data, which is poorly adaptable to different types of storage tanks, and reasonable parameters cannot be determined for different types of storage tanks, resulting in blindness in the initial stage of pre-cooling operations; and the traditional The pre-cooling process mostly adopts the wiring monitoring method. The temperature and stress sensors are installed in the position where the storage tank is easy to observe. The installation position of the sensor is limited. It is difficult to wire and monitor the possible stress concentration, especially for large storage tanks. , and there are safety risks in the wiring process; in addition, it is difficult to read the instrument parameters in complex spaces, making it difficult to grasp the pre-cooling parameters in real time

[0004] In the traditional pre-cooling method, the staff manually calculates the temperature change rate and the temperature difference data between two adjacent points according to the temperature change, and manually adjusts the valve accordingly, resulting in delays, poor precision, and low timeliness in the adjustment process.

The pre-cooling process of LNG storage tanks lasts for a long time. Therefore, when using the traditional pre-cooling method, it is necessary to arrange special personnel to conduct regular inspections on the data of the monitoring points, which will waste a lot of manpower and material resources, and it is difficult to grasp the pre-cooling process in real time. Temperature changes and stress changes; at the same time, there is a risk of refrigerant leakage during the pre-cooling process, which cannot fully guarantee the safety of personnel

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