[Ten years of great development in chemical technology] 061-2023 The first domestic and the world’s largest cold energy power generation device was successfully connected to the grid in Shanghai
Thread Content
From February to May 2023, good news came from the cold energy power generation test team of Shanghai Liquefied Natural Gas Co., Ltd. (referred to as Shanghai LNG), a subsidiary of Shenergy Group. The first domestic cold energy power generation device currently being commissioned successfully passed the performance and reliability test. During the period, the maximum power generation power reached more than 3,000 kilowatts. The device is safe and reliable, and meets various performance indicators. The Shanghai LNG cold energy power generation device is the first in China and currently the largest cold energy power generation device in the world. It has a designed annual power generation capacity of 24 million kilowatt hours. It can reduce energy consumption by nearly 7,000 tons of standard coal and reduce carbon emissions by about 10,000 tons per year. This device not only effectively develops and utilizes excess cold energy, but also fills the gap in the field of cold energy power generation in my country. It is understood that the Shanghai LNG cold energy power generation device is adapted to local conditions. It uses propane as the intermediate medium of the IFV vaporizer as the working medium, and uses the high-quality low-temperature cold energy of LNG and the low-grade thermal energy of seawater to generate electric energy. On the basis of the conventional integrated IFV vaporizer , separate the two heat exchangers of the propane evaporator with seawater as the heat source and the propane condenser with LNG as the cold source, increase the propane pump pressure increase, and add the turbine generator unit to use the propane steam expansion to reduce pressure and temperature, thus forming a closed-circuit Rankine cycle of propane. The cold energy power generation device can use cold energy to generate about 3,000 kilowatts of electricity on the basis of gasifying 200 tons of LNG per hour. It not only fulfills the basic responsibility of ensuring safety and supply, but also exerts energy saving and emission reduction effects through comprehensive utilization of energy.
The Shanghai LNG project storage tank expansion cold energy generation electrification facility project has a maximum power generation power of more than 3,000 kilowatts per hour, which can reduce energy consumption by nearly 7,000 tons of standard coal and reduce carbon emissions by about 10,000 tons per year. The country's first and the world's largest cold energy power generation device located at the Yangshan LNG receiving station in Shanghai has recently completed grid-connected power generation commissioning and successfully passed performance and reliability tests, effectively filling the gap in my country's cold energy power generation field.
The project has a rated LNG gasification capacity of 205.2t/h and uses seawater as the heat source. The cold energy power generation device adopts a low-temperature Rankine cycle system, and propane is selected as the working medium. In a cold power generation device (CPG), the heat from seawater is transferred to the LNG intermediate heat transfer medium and then used to gasify LNG. The intermediate heat transfer medium is refrigerant grade propane (at least 98 mol% purity). In this process, propane evaporated from seawater drives a turbine connected to a generator set to generate electricity using cold energy recovered from LNG, which is discharged into the ocean during traditional LNG gasification processes.
This is China's first cold energy power generation device, which can use cold energy to generate 2,000 to 4,000 kilowatts of electricity based on the gasification of 200 tons of liquefied natural gas per hour. It not only adapts to local conditions, but also innovatively utilizes the high-quality low-temperature cold energy of liquefied natural gas and the low-grade thermal energy of seawater to generate electric energy.； It can also realize non-interruption switching between "power generation operation" and "bypass gasification" modes, "one-button" start and stop, and convenient operation.
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