Intelligent small cold energy power generation device and control method thereof

Abstract

The invention discloses an intelligent small cold energy power generation device and a control method thereof. The intelligent small cold energy power generation device comprises an LNG storage tank,a first stop valve, a gasifier, a pressure adjusting valve, a flow meter, an LNG cold energy transmission system, a cold energy power generation system and an intelligent control system. The LNG coldenergy transmission system comprises a first heat exchanger arranged on a main pipeline in a series connection manner or a side connection manner. The cold energy power generation system comprises a low-temperature pump, a second heat exchanger, an expander and a power generator. The intelligent control system comprises a PLC, a first temperature pressure transmitter, a second temperature pressuretransmitter, a third temperature pressure transmitter, a temperature transmitter, an online methane monitor and an electromagnetic valve, all of which are connected through a circuit. The intelligentsmall cold energy power generation device is simple in structure, is highly integrated, can serve as a power support for a remote powerless and power-shortage satellite station and can also serve asfield station power supply supplementing or an emergency channel when a main pipeline breaks down. The safety automation degree is high, energy industry upgrading is assisted, and good social benefitsare achieved.

Description

technical field [0001] The invention relates to the field of LNG cold energy power generation, in particular to an intelligent small cold energy power generation device and a control method thereof. Background technique [0002] As a clean fuel with low emissions, LNG is the fastest growing energy source in the world today. According to the statistics of Bp Company, in 2015, natural gas accounted for 23.8% of the primary energy consumption in the world, and the total annual consumption in China increased by 4.7% compared with last year, with a total consumption of 19.73 billion m³. The research on LNG cold energy utilization in my country began in the 1990s. Chen Guobang and Zhu Jianwen successively proposed the concept of liquefied natural gas cold energy, which provided a detailed analysis for the future research on LNG cold energy utilization in my country. The temperature difference between LNG and the surrounding environment medium (such as seawater, air and other phas...

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Problems solved by technology

[0004] Patent CN105569752U discloses a process and device for using cold energy to generate electricity. A large amount of cold energy is released during the process of vaporization to supply natural gas to the downstream pipeline network. Two independent cycles are used to recover the cold energy for power generation, avoiding cold energy The loss of the enterprise improves the economic benefits of the enterprise, avoids the pollution caused by the power plant while generating electricity, and meets the requirements of energy conservation and environmental protection, but the device does not involve an intelligent manufacturing method

[0005] Patent CN104989459 discloses an intelligent natural gas pipeline network pressure energy power generation device, which realizes the comprehensive and efficient utilization of the power storage system and the power generation system, and can also realize unmanned operation of the station, saving a lot of manpower and ensuring the safety of the station. Power generation uses LNG pressure energy instead of LNG cold energy

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