Natural gas constant-pressure liquefaction device

Abstract

The invention relates to a natural gas constant-pressure liquefaction device. A Rankine cycle system which is arranged at a low-temperature end and similar to a thermal power cycle device is used in the natural gas constant-pressure liquefaction device. A low-temperature pump is adopted to input power, and the natural gas constant-pressure liquefaction device is cooled through refrigerants in a compensating mode so as to achieve constant-pressure liquefaction of natural gas. On the premise of the same refrigerating capacity, compared with a traditional advanced set, the natural gas constant-pressure liquefaction device saves energy by more than 30%, and is a breakthrough of a traditional natural gas liquefaction technology, and is obvious in economic, social and environment protection benefits.

Description

technical field [0001] The invention relates to a natural gas isobaric liquefaction device, specifically belonging to the technical field of deep freezing. Background technique [0002] Natural gas is a high-quality and clean fossil energy, which plays a very important role in the national economy. The liquefaction and storage of natural gas is the key technology for its development and utilization. It has formed an industry at home and abroad, with an average annual growth rate of 8%. In recent years, it has grown rapidly in China's energy consumption structure. Liquefied natural gas technology has become a high-tech technology, which has been valued by more and more scientific and technological disciplines. [0003] It is estimated that by the middle of this century, if China consumes 5000*10 natural gas 8 m 3 / a, of which imported LNG1000*10 8 m 3 / a calculation (equivalent to Japan's current import volume), the available cold energy equivalent to electric energy is ...

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Problems solved by technology

[0028] The purpose of the present invention is to solve the incompleteness of Carnot's theorem applied to the theoretical analysis of the natural gas liquefaction plant cycle, to propose a new refrigeration theory corresponding to the thermodynamic theory, that is, the cold dynamics theory, and to propose a new natural gas isobaric system designed using this principle. The liquefaction device overcomes the shortcomings of the traditional natural gas liquefaction process such as complexity, high energy consumption, and excessive public facilities such as circulating cooling water systems, retains and develops the advantages of the liquefaction process with an expander, and greatly reduces energy consumption by more than 30%. , and at the same time realize the isobaric condensation of natural gas, greatly reduce equipment maintenance and material reserves, thereby realizing the transformation of natural gas liquefaction technology

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