LNG vaporizer with step vaporization technology

Abstract

The invention discloses an LNG vaporizer with a step vaporization technology. Partition plates are utilized by the vaporizer to divide a vaporizer shell into an LNG heat exchange cavity, a first heat exchange medium heat exchange cavity and a second heat exchange medium heat exchange cavity, and through holes are formed in the positions, between the cavities, of the partition plates; a plurality of heat pipes penetrate and stretch into three different cavities through the through holes, and a plurality of fins are arranged on the heat pipes in a penetrating stretching manner; LNG, first heat exchange media and second heat exchange media flow through respective heat exchange cavities respectively; the heat pipes serve as heat transfer bodies, and the step temperature rising method is adopted to achieve the aim that the second heat exchange media with the high temperature are utilized for enabling the temperature of LNG at the temperature of -163 DEG C to rise, and for vaporizing the LNG; evaporation ends and condensation ends of the heat pipes and middle refrigerants are reasonably utilized for solving the problem that in the vaporization process of the LNG, due to the low initial temperature, the heat exchange media are iced, and the vaporization performance of the vaporizer is worsened; and the flow of the second heat exchange media is utilized and adjusted to be matched with the vaporization amount of the LNG, and it is ensured that the LNG vaporizer efficiently and stably runs.

Description

technical field [0001] The invention relates to a vaporizer, in particular to an LNG vaporizer adopting cascade vaporization technology, and belongs to the field of heat exchangers. Background technique [0002] With the development of the global economy, the shortage of global oil resources and the increasingly serious environmental pollution problems have led to a sharp increase in the consumption of natural gas with good combustibility and low pollution. Natural gas is a gas at room temperature, which is not convenient for storage and long-distance transportation. Generally, it is first converted into -163°C cryogenic liquid (LNG), and then stored and transported over long distances. However, before using LNG, it is necessary to use a vaporization device to increase the temperature of LNG at about -163°C to natural gas (NG) at about 5°C; [0003] At present, vaporizers used for LNG vaporization mainly include the following types: [0004] (1) Open-frame vaporizer, that ...

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Problems solved by technology

The evaporator uses heat pipes as the heat transfer body, uses the first heat exchange medium as the intermediate refrigerant, rationally utilizes the evaporation end and condensation end of the heat pipe, and adopts a stepwise temperature rise method to solve the problem caused by the low initial temperature in the process of LNG vaporization. The freezing of the heat exchange medium leads to the deterioration of the vaporization performance of the carburetor, which ensures the stable progress of LNG vaporization; by adjusting the flow rate of the second heat exchange medium to match the amount of LNG vaporization, the adjustment of operating conditions is realized.

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