A Design Method of Single Heat Exchange Fin for LNG Vaporizer

Abstract

Disclosed is a method for designing a single heat exchange fin of an LNG vaporizer. The single heat exchange fin (1) comprises a matrix (1.1), an inner hole formed in a central line of the matrix and a left support (1.2) and a right support (1.3) which are connected with the left end and the right end of the matrix. An odd number of outer fins are designed symmetrically at the upper end and the lower end of the matrix respectively, and the outer fins are in pointed-top indented shapes and subdivided into side fins (1.1.1), central fins (1.1.3) and middle fins (1.1.2). An even number of protruding grooves (1.1.4) are distributed uniformly at equal intervals in the circumferential direction of the inner hole. Compared with a prior heat exchange fin, the single heat exchange fin has the advantages that the evaporative power of the single heat exchange fin can reach 0.3t / h, mounting space required by the single heat exchange fin is reduced by 40%, the amount of seawater passing through the single heat exchange fin is reduced by 15%, the pressure bearing capacity of the single heat exchange fin is no lower than 8MPa, the security coefficient is high, the heat exchange effect is good, and the icing thickness and height of the LNG vaporizer are reduced.

Description

technical field [0001] The invention belongs to the technical field of LNG vaporizers, in particular to a design method for a single heat exchange fin used in an LNG vaporizer. Background technique [0002] Gaseous natural gas NG turns into liquid natural gas LNG after being liquefied at -162°C, and its volume can be reduced by about 620 times, which is very beneficial to reduce transportation and storage costs. However, liquid natural gas LNG must be vaporized by a vaporizer before it can be converted into gaseous natural gas. Ng. With the rapid increase in the number of LNG receiving stations in China, the market demand for LNG vaporizers is also expanding. [0003] At present, the open-frame LNG vaporizer is mostly used. The open-frame LNG vaporizer can vaporize the liquefied natural gas at about -162°C through heat exchange with the seawater outside the fins, and raise it to a normal temperature of about 2°C. The open-frame LNG vaporizer is working When the pressure is...

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Problems solved by technology

[0003] At present, the open-frame LNG vaporizer is mostly used. The open-frame LNG vaporizer can vaporize the liquefied natural gas at about -162°C through heat exchange with the seawater outside the fins, and raise it to a normal temperature of about 2°C. The open-frame LNG vaporizer is working When the pressure is as high as 8MPa or more, all the open-frame LNG vaporizers are imported. So far, no high-efficiency heat exchange fins with a high safety factor for open-frame LNG vaporizers have been produced in China. Due to the limited evaporation capacity of the heat exchange fins, the open-frame Reduced efficiency of LNG vaporizers

[0004] Chinese patent CN201220369897.1 discloses a high-efficiency heat transfer tube for LNG vaporizer, wherein the outer finned tube has a plurality of outer fins, and a plurality of inner fins are arranged around the center hole inside the tube body, and the center of the tube body is up and down , Left and right symmetry, corrugated protrusions on the surface of the outer fins can increase the heat transfer area and strengthen the sea side heat transfer, but its evaporation capacity is small, and the space required for installation is large

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