JPH08157841A - Heater for ng header in double pipe type lng carburetor - Google Patents

Abstract

PURPOSE: To provide the subject readily detachable heater for preventing an NG temperature from dropping than a standard value, having excellent handleability, by immersing an NG header in a sea water pond and supplying sea water to the sea water pond to heat the NG header. CONSTITUTION: An LNG supplied from an LNG header 1 is sent to an inner pipe 4 of a double pipe type heat transfer pipe 3, dropped, inverted at the lower end and is raised in an outer pipe 5. In the process, the LNG is vaporized by heating with sea water sprinkled from troughs 9 and 9a and the vaporized LNG is collected in an NG header 7 and sent to a superheater side. Further, the NG header 7 is immersed in a sea water pond 10, sea water is supplied to the sea water pond 10 and the NG header 7 is heated to provide the objective heater. Overflow holes of the sea water pond 10 are preferably arranged above troughs 9 and 9a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for an NG header in a double pipe type LNG vaporizer.

[0002]

2 and 3 show a conventional double-tube LNG vaporizer. Reference numeral 1 is an LNG header, 2 is a vent pipe, 3 is a heat transfer pipe, 4 is an inner pipe, 5 is an outer pipe, 6 is a heat insulating material, 7
Is an NG header, 8 is a cap, 9 and 9a are troughs arranged on both upper sides of the heat transfer tube 3, and L supplied from the LNG header 1 through the vent tube 2 into the heat transfer tube 3
While NG (liquefied natural gas) descends in the inner pipe 4, reverses at its lower end and rises in the outer pipe 5, it is heated and vaporized by the seawater sprinkled from the troughs 9a, and NG ( Natural gas) is collected in the NG header 7 and then sent to the consumer side or a superheater (not shown). In the case of the above-mentioned conventional example, in order to maintain the temperature of the NG sent from the NG header 7 at 0 ° C., the part penetrating the NG header 7 from the vent pipe 2 flows in the vent pipe 2 −16.
The heat insulating material 6 is attached so that the NG in the NG header 7 is not cooled by the cold heat of the LNG at 2 ° C.

[0003]

However, the above-mentioned conventional vaporizer has the following drawbacks. a. Since LNG at −162 ° C. is flowing in the vent pipe 2 and the inner pipe 4, even if the heat insulating material 6 is used, the NG header 7
There is a limit to the heat insulation to the NG flowing inside, and it may not be possible to maintain the above-mentioned reference temperature of 0 ° C. b. Since the NG header 7 is joined to the vent pipe 2 via the cap 8, the vent pipe 2 and the NG header 7 are
The NG header 7 itself is cooled by heat transfer between them, and the NG inside is cooled by the heat transfer from now on.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and the constitution thereof is as follows. 1. LNG supplied from the LNG header is sent into the inner tube of the double-tube heat transfer tube and lowered, and at the lower end it is heated and vaporized by seawater sprinkled from the trough in the process of rising and rising inside the outer tube. Double pipe type L that collects vaporized NG in the NG header and sends it to the superheater side
In the NG vaporizer, the NG header is submerged in the seawater pond, and the NG header is heated in the double-pipe LNG vaporizer configured to supply seawater into the seawater pond to heat the NG header. apparatus. 2. 2. The warming device for an NG header in a double-tube LNG vaporizer according to the above 1, wherein an overflow port for pond of seawater is arranged on the trough. 3. 2. The heating device for an NG header in a double pipe type LNG vaporizer, wherein the surface of seawater pond is set at the base of the cap in 1 or 2 above.

[0005]

The LNG supplied from the LNG header is heated and vaporized by the seawater sprinkled from the trough in the heat transfer tube, collected in the NG header, and sent to the consumer side. Further, seawater is supplied to the seawater pond, and the heat of the seawater heats the NG header. The seawater in the seawater pond overflows into the lower trough and is sprinkled from this trough to the heat transfer tubes.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiment shown in FIG. 1. In FIG. 1, 1 is an LNG header,
2 is a vent pipe, 3 is a heat transfer pipe, 4 is an inner pipe, 5 is an outer pipe, 7 is an NG header, 8 is a cap, 9 and 9a are troughs, 10
Is a seawater pond of such a size that the NG header 7 is submerged. The seawater pond 10 has a water level up to the base of the cap 8, and seawater is supplied from the pond water supply pipes 11 and 11a.
The overflowed seawater flows down into the lower troughs 9 and 9a and is sprayed to heat the heat transfer tubes 3. 12, 12a in the figure
Is a trough water pipe. In the above embodiment, the bottom plate 10a of the seawater pond 10 and the outer pipe 5 may be simply welded a so that they can be easily separated later.

[0007]

As described above, the present invention has the following effects because the NG header is heated with seawater. a. Since the NG header is heated, cooling of the NG header and cooling of the internal NG can be prevented, and the NG temperature can be prevented from falling below the reference value. b. Since the seawater supplied into the seawater pond enters the trough again, the panel outlet temperature can be raised without increasing the amount of seawater. c. When the seawater temperature is high, heating of the NG header can be stopped by monitoring the NG temperature, for example. d. By simply welding the NG header and the seawater pond bottom plate, it is easy to remove them later.

[Brief description of drawings]

FIG. 1 is an N diagram of a double-tube LNG vaporizer according to the present invention.
Explanatory drawing of the heating apparatus of G header.

FIG. 2 is an explanatory view of a conventional double-tube LNG vaporizer.

FIG. 3 is a conventional double-tube vaporizer LNG header and N
Explanatory drawing of a G header part.

[Explanation of symbols]

 1 LNG header 2 Vent pipe 3 Heat transfer pipe 4 Inner pipe 5 Outer pipe 6 Insulation material 7 NG header 8 Cap 9, 9a Trough 10 Seawater pond 10a Bottom plate 11, 11a Pond water supply pipe 12, 12a Trough water supply pipe

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Yu Sekiguchi 15-10-718 Miyamatsu-cho, Hiratsuka-shi, Kanagawa Prefecture (72) Inventor Shin-ichi Kasahara 4-4-11-204 Nakahara, Isogo-ku, Yokohama-shi, Kanagawa (72) Invention Person Hitoshi Shoya 1-10 Fuso-cho Amagasaki-shi Hyogo Prefecture Sumitomo Precision Industries Ltd. (72) Inventor Yu Akiyama 1-10 Fuso-cho Amagasaki City Hyogo Sumitomo Precision Industries Ltd. (72) Invention Person Sotoike Yoshiro Sumitomo Precision Industry Co., Ltd. 1-10 Fusocho Amagasaki City Hyogo Prefecture

Claims (3)

[Claims] 1. LNG supplied from an LNG header is fed into the inner tube of a double-tube heat transfer tube to be lowered, and at the lower end it is heated by seawater sprinkled from a trough in the process of ascending and rising inside the outer tube. In a double-tube LNG vaporizer that vaporizes and collects the vaporized NG in the NG header and sends it to the superheater side, the NG header is submerged in the seawater pond, and seawater is supplied into the seawater pond. A device for heating an NG header in a double-tube LNG vaporizer configured to heat the NG header. 2. The warming device for an NG header in a double-tube LNG vaporizer according to claim 1, wherein the overflow port of the seawater pond is arranged on the trough. 3. The heating device for an NG header in a double-tube LNG vaporizer according to claim 1, wherein the water surface of the seawater pond is set at the base of the cap.