Intermediate fluid vaporizer

Abstract

The intermediate fluid vaporizer (10) is provided with: an intermediate fluid evaporator (E1), which has heat transfer tubes (20) through which seawater flows and which evaporate at least a portion of a liquid intermediate medium (M) by thermal exchange between the seawater inside the heat transfer tubes (20) and the intermediate medium (M) outside said heat transfer tubes (20); and an LNG evaporator (E2), which has a heat transfer tube (40) through which LNG flows and which vaporizes the LNG inside the heat transfer tube (40) by condensing the intermediate medium (M), which has been evaporated in the intermediate medium evaporator (E1), outside the heat transfer tube (40). The heat transfer tubes (20) of the intermediate fluid evaporator (E1) are made of titanium or a titanium alloy. On the outer circumferential surface of the heat transfer tubes (20), grooves, which have cavitary portions that communicate with the outside through gaps in the outer surface, are formed.

Description

technical field [0001] The present invention relates to an intermediate medium type gasifier which heats and vaporizes low-temperature liquids such as liquefied natural gas (hereinafter referred to as LNG) by using an intermediate medium such as propane. Background technique [0002] Conventionally, as disclosed in the following Patent Documents 1 and 2, an intermediate medium type vaporizer using an intermediate medium in addition to a heat source fluid is known as an apparatus for continuously vaporizing a low-temperature liquid such as LNG with a compact structure. Such as Figure 5 As shown, the intermediate medium gasifier disclosed in Patent Document 1 includes an intermediate medium evaporator E1, an LNG evaporator E2, and an NG (natural gas) heater E3. Furthermore, an inlet chamber 50 , a plurality of heat transfer tubes 52 , an intermediate chamber 54 , a plurality of heat transfer tubes 56 , and an outlet chamber 58 are sequentially provided in the gasifier for pas...

AI Technical Summary

Problems solved by technology

Therefore, when heat is exchanged between the seawater flowing in the inner tube and the heat medium outside the outer tube, separation occurs between the inner tube and the outer tube, and there is a problem that the heat transfer performance cannot be improved to an expected level.

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