Energy cascade comprehensive utilization method of LNG (liquefied natural gas) cold energy

Abstract

The invention discloses an energy cascade comprehensive utilization method of LNG (liquefied natural gas) cold energy. The energy cascade comprehensive utilization method comprises the following steps that firstly, the LNG cold energy of a deep cold part is converted into electric energy by Rankine cycle power generation; then, the LNG cold energy of a middle cold part is recovered by a cooling medium for supplying cold to a cold storage warehouse, meanwhile, the gasifying pressure of a power generation working medium in the Rankine cycle power generation process is controlled, the cold energy released by the gasifying of the liquid power generation working medium is matched with the temperature of the required cold energy of the cold storage warehouse, and the cold energy released by the gasifying of the liquid power generation working medium is used as a cold source for supplying cold to the cold storage warehouse; and the LNG cold energy of a shallow cold part is recovered and used as a cold source for an air conditioner system of a cold storage plant, and is used for supplying cold to product processing workshops of the cold storage, office buildings and storage warehouses. The energy cascade comprehensive utilization method has the advantages that through the system integration, the LNG is gradually used for power generation, cold supply of cold storage warehouses and cold supply of plant air conditioners from lower grade to upper grade according to the temperatures, the cascade utilization of the cold energy is realized, and the cold energy of the LNG is utilized highly efficiently in the low-temperature cold storages.

Description

technical field [0001] The invention belongs to the field of cold energy utilization of liquefied natural gas (LNG), and in particular relates to an energy-level comprehensive utilization method of cold energy of liquefied natural gas (LNG). Background technique [0002] The refrigeration industry is a large energy consumer. At present, the electricity consumed by refrigeration equipment accounts for about 15% of the world's production electricity. How to reduce energy consumption in the refrigeration industry is an important topic for energy conservation and emission reduction. [0003] In order to optimize the energy structure and reduce carbon dioxide emissions, my country has begun to develop and utilize natural gas on a large scale. At present, my country has planned and constructed a number of liquefied natural gas (LNG) station line projects in coastal areas such as Guangdong, Fujian, Zhejiang, Shanghai, Jiangsu, Shandong, Hebei, and Liaoning. According to data relea...

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Problems solved by technology

[0012] In order to overcome the problem of low cold energy utilization efficiency of the above-mentioned existing natural gas cold energy utilization methods, the object of the present invention is to provide an energy cascade comprehensive utilization method of liquefied natural gas cold energy, which is designed according to the principle of energy cascade utilization , the method of the present invention can utilize the cold energy of LNG to provide the cold storage required cold energy for the warehouse, the air-conditioning cold energy required for buildings, and the electric energy required for frozen product processing and lighting

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