JPH08127784A - Double-pipe lng vaporizer and ng superheater - Google Patents

Abstract

PURPOSE: To surely vaporize residual mist contained in NG being fed from an LNG vaporizer and, at the same time, to prevent such an unfavorable phenomenon that the quantity of heat of the delivered gas becomes unstable due to channeling of mist for each NG superheating panel. CONSTITUTION: An NG header 4 of an LNG vaporizer 1 comprising a number of heat exchangers arranged in a panel form as such is extended to serve as an NG inlet header 7 on the NG superheater 6 side. A superheating panel 8 is disposed below the NG inlet header 7, and an NG outlet header 9 is mounted on the lower part of the superheating panel 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Double-pipe LNG that inverts NG (liquefied natural gas) at the lower end of this inner pipe, introduces it into the outer pipe, and vaporizes by seawater, etc., flowing down from the trough in the process of rising inside this outer pipe
The present invention relates to a double-tube LNG vaporizer and an NG superheater including a vaporizer and an NG superheater for superheating natural gas (hereinafter referred to as "NG") vaporized by the LNG vaporizer.

[0002]

2. Description of the Related Art In the case of a double pipe type LNG vaporizer, the temperature of NG generated is usually as low as 0 ° C. or lower, so that it cannot be directly sent to the consumer side. So this L
A method of combining an NG vaporizer and an NG superheater, and raising the temperature to room temperature by the NG superheater and sending it is adopted.

FIG. 3 shows a conventional LNG vaporizer and NG superheater. 1 is a double-tube LNG vaporizer,
In this LNG vaporizer 1, an LNG header 3 is arranged at the upper part, and LNG is supplied from the header 3 into the inner pipe of a double pipe heat transfer pipe (vaporization panel) 2 arranged in a panel shape, and the lower end of this inner pipe is supplied. It is turned upside down to raise the inside of the outer tube, and in this process it is heat-exchanged with the seawater flowing down from the trough (not shown) to be vaporized, and the vaporized NG is NG from the upper NG header 4
Collected in a line 5 and led to an NG inlet header 7 provided at the lower end of the NG superheater 6, from which the inside of the superheated panel 8 is raised, and the seawater heat is used to superheat it to room temperature. It is a structure to collect and send to the consumer side. In the figure, 10 is an LNG supply line, and 11 is an NG sending line.

[0004]

As described above, the conventional L
Since the NG vaporizer and the NG superheater are separately configured, the following problems occur. a. The temperature of the NG sent from the LNG vaporizer 1 is usually 0.
Since the temperature is not higher than 0 ° C., when the gas dew point becomes high due to the composition of LNG, some heavy component mist (droplets) escapes from the LNG vaporizer 1 together with NG. At this time, since the superheat panel 8 is an upward flow type, the mist stays in the inlet header 7 at the lower part thereof, which causes the heat quantity of the gas sent to the consumer side to be unstable. b. Since the low-temperature NG joined in the NG line 5 has a piping configuration that branches into a plurality of superheat panels 8, when the mist is accompanied as described above, its uniform distribution is not guaranteed and the superheat panel 8 It becomes difficult to properly design.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and the constitution thereof is as follows. NNG on the NG superheater side by extending the NG header of the LNG vaporizer with many heat transfer tubes arranged in a panel
There is no G inlet header. An overheating panel is placed below this NG inlet header and at the bottom of this overheating panel.
Double tube LNG vaporizer and NG superheater with G outlet header attached.

[0006]

[Function] The NG vaporized by the LNG vaporizer and collected in the NG header goes straight to the inlet NG header side arranged above the superheat panel on the NG superheater side, and from there, enters the superheat panel. While entering and descending in this panel, it is superheated to normal temperature by seawater heat and is delivered from the lower NG outlet header to the consumer side via the NG delivery line.

[0007]

1 and 2 show an embodiment of the present invention. 1 is a vaporizer, 2 is a double tube vaporization panel, 3 is an LNG line 1
An LNG header tied to 0 and 4 are NG headers. Reference numeral 6 denotes an NG superheater. The superheat panel 8 of the NG superheater 6 is arranged in pairs with the LNG vaporization panel 2 so as to be in line with the LNG vaporization panel 2 and also has an upper NG inlet header 7 Are connected to the NG header 4 so as to form one straight pipe. Reference numeral 9 denotes an NG outlet header attached to the lower portion of the overheat panel 8, and the NG that has been overheated to room temperature is delivered from the NG outlet header 9 to the consumer side via the NG delivery line 11.

[0008]

As described above, according to the present invention, the vaporization panel and the superheat panel are arranged side by side so as to form a pair, and the NG header on the vaporization panel side is extended to the superheat panel side to form the NG inlet header. The NG which was unified and vaporized by the LNG vaporizer was directly fed into the superheated panel. As a result, the following effects are achieved. a. Since the flow direction of the NG superheater is downward flow, LN
The residual mist can be reliably vaporized by the heat transfer tube that constitutes the G vaporization panel. b. Since the LNG vaporizer and the NG superheater have a one-to-one correspondence in each panel, it is not necessary to consider the drift of the mist in each superheat panel. c. Since the LNG vaporizer and the NG superheater are integrated in the same panel, the connecting pipe connecting the LNG vaporizer and the NG superheater is unnecessary.

[Brief description of drawings]

FIG. 1 is a front view of an LNG vaporization and NG superheater according to the present invention.

FIG. 2 is a plan view of an LNG vaporization and NG superheater according to the present invention.

FIG. 3 is an explanatory view of a conventional LNG vaporizing and NG superheating device.

[Explanation of symbols]

 1 LNG vaporizer 2 LNG header 3 Vaporization panel 4 NG header 5 NG line 6 NG superheater 7 NG inlet header 8 NG superheat panel 9 NG outlet header 10 LNG line 11 NG delivery line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yu Akiyama 1-10 Fuso-cho, Amagasaki-shi, Hyogo Sumitomo Precision Industries Ltd. (72) Inventor Yoshiro Tonoike 1-10 Fuso-cho, Amagasaki-shi Hyogo Sumitomo Precision Co., Ltd. Within Kogyo Co., Ltd.

Claims (1)

[Claims] 1. An L having a large number of heat transfer tubes arranged in a panel.
The NG header of the NG vaporizer is extended as it is to form an NG inlet header on the NG superheater side, a superheat panel is arranged below this NG inlet header, and an NG outlet header is attached to the bottom of this superheat panel. Pipe type L
NG vaporizer and NG superheater.