JPH0649468A - Vacuum boiler-type evaporator - Google Patents

Abstract

PURPOSE:To improve the construction of an auxiliary heat-exchanger to be used for preventing the stagnation of noncondensable gas in a heat-transfer tube. CONSTITUTION:A heat-transfer tube passing through the evaporation part of a vacuum boiler-type evaporator is provided with a heat-exchanging means to exchange the heat between a part at the upstream side of the evaporation part and an auxiliary heat-exchanger placed in a condensed liquid return line extending from the evaporation part to the evaporator pot. The apparatus has the following merits. (1) It is not necessary to extend the pipe to the installation site of the auxiliary heat-exchanger in contrast with conventional apparatus to use an external fluid as a cooling medium and, accordingly, the apparatus cost and installation space can be reduced. (2) The supplying source of the external fluid and the operation cost of the source can be eliminated. (3) The thermal efficiency of the evaporator is improved by the effective utilization of the condensation heat of the steam for the evaporation of the lowtemperature fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decompression boiler type vaporizer for vaporizing a low temperature fluid such as LNG.

[0002]

2. Description of the Related Art There is a decompression boiler type vaporizer as one of vaporizers for vaporizing a low temperature fluid such as LNG. An example of this pressure reducing boiler type vaporizer will be described with reference to FIG.

In FIG. 2, reference numeral 1 is a can body, and below the can body 1, steam is generated by heating the inner can water 3 using the combustion gas of the burner 2, high temperature steam, etc. as a heating medium. The heating unit 4 for generating A vaporization section 5 is provided on the upper side of the can body 1, and a heat transfer tube 6 through which a low-temperature fluid to be vaporized flows is provided in the vaporization section 5. A vapor outgoing path 4 and a condensate return line 7 are provided between the vaporization section 5 and the can body 1, and an auxiliary heat exchanger 8 is provided in the condensate return line 7 and the auxiliary heat exchanger 8 has a can. The suction side of a vacuum pump 9 for decompressing the inside is connected.

In such a structure, the decompressed steam (hereinafter simply referred to as steam) generated by being heated by the heating medium in the can body 1 flows into the vaporization section 5 through the steam outgoing path 4 and the heat transfer tube. Heat exchanges with the low temperature fluid flowing in 6 to vaporize it, which itself condenses and returns to the can body 1 via the condensate return line 7.

The auxiliary heat exchanger 8 is used to prevent the noncondensable gas from staying in the heat transfer tube 6 portion. That is,
The steam and the like flowing in from the vaporization section are cooled by exchanging heat with the heat medium for cooling in the auxiliary heat exchanger 8, and the steam is condensed and returned to the can body 1 through the condensate return line 7 and ,
The non-condensable gas that does not condense in the auxiliary heat exchanger 8 is sucked by the vacuum pump 9 and discharged to the outside of the system.

Conventionally, an external fluid such as industrial water is supplied to the pipe 10.
Is supplied to the auxiliary heat exchanger 8 and used as a heat medium for cooling.

[0007]

As described above, the conventional vaporizer has the following problems because it uses the external fluid as the cooling heat medium in the auxiliary heat exchanger. It is necessary to lay the piping for the external fluid to the place where the auxiliary heat exchanger of the carburetor is installed, which increases equipment cost and required space. External fluid source and operating costs are required. Since the external fluid is used as the cooling heat medium, the condensation heat cannot be effectively used, and the heat efficiency of the vaporizer is reduced accordingly. The present invention aims to solve such problems.

[0008]

Means for solving the above problems will be described with reference to FIG. 1 corresponding to an embodiment. In the present invention, a heat transfer tube 6 passing through a vaporization section 5 of a decompression boiler type vaporizer. Of the vaporization section 5, and the vaporization section 5
A decompression boiler type carburetor is proposed which comprises a heat exchange means 11 with an auxiliary heat exchanger 8 provided in a condensate return line 7 extending from the to the can body 1.

Further, the present invention proposes that the heat exchanging means 11 is constituted by the heat pipe 12 in the above constitution.

[0010]

The steam or the like flowing into the auxiliary heat exchanger 8 from the vaporization section 5 is cooled by exchanging heat with the low temperature fluid flowing through the heat transfer pipe 6 upstream of the vaporization section 5 via the heat exchange means 11. To be done. Therefore, the vapor condenses and returns to the can body 1 through the condensate return line 7, and the non-condensable gas that does not condense is sucked by the vacuum pump 9 and discharged to the outside of the system. On the other hand, since the cryogenic fluid is heated by the heat exchange on the upstream side of the vaporization section 5, the condensation heat of the vapor is effectively used for vaporizing the cryogenic fluid.

[0011]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a system diagram showing an embodiment of the configuration of the decompression boiler type carburetor of the present invention, and the same components as those of the conventional configuration shown in FIG.

In the figure, reference numeral 1 is a can body, and below the can body 1, a heating unit for heating the can water 3 inside by using the combustion gas of the burner 2 as a heating medium for heating to generate steam. 4 is provided. As the heating medium for heating, other than the combustion gas of the burner 2, high temperature steam or the like can be used, and the configuration of the heating unit 4 is appropriate. A vaporization section 5 is provided on the upper side of the can body 1, and a heat transfer tube 6 for flowing a low temperature fluid to be vaporized is provided in the vaporization section 5. A vapor outgoing path 4 and a condensate return line 7 are provided between the vaporization section 5 and the can body 1, and an auxiliary heat exchanger 8 is provided in the condensate return line 7 and the auxiliary heat exchanger 8 has a can. The suction side of a vacuum pump 9 for decompressing the inside is connected. The heat transfer tube 6 constitutes a heat exchange means 11 between the auxiliary heat exchanger 8 and a portion of the heat transfer tube 6 on the upstream side of the vaporization section 5. In the embodiment, the heat exchange means 11 is a heat pipe 12
However, the heat exchange means 11 has an appropriate configuration.

[0013]

As described above, the present invention has the following effects. It is not necessary to lay the pipe up to the place where the auxiliary heat exchanger is installed unlike the conventional configuration in which an external fluid is used as the heating heat medium, and the equipment cost and required space are reduced. No need for external fluid supply and operating costs. The heat of condensation of the vapor can be effectively used for vaporizing the low temperature fluid, and the thermal efficiency of the vaporizer is improved.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the configuration of a decompression boiler type vaporizer of the present invention.

FIG. 2 is a system diagram showing a configuration of a conventional decompression boiler type vaporizer.

[Explanation of symbols]

 1 Can body 2 Burner 3 Can water 4 Heating part 5 Vaporizing part 6 Heat transfer pipe 7 Condensate return line 8 Auxiliary heat exchanger 9 Vacuum pump 10 Piping 11 Heat exchange means 12 Heat pipe

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[Procedure amendment]

[Submission date] July 30, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

As described above, the present invention has the following effects. Unlike the conventional configuration in which an external fluid is used as the heat medium for cooling, it is not necessary to lay the pipe to the place where the auxiliary heat exchanger is installed, and the equipment cost and required space are reduced. No need for external fluid supply and operating costs. The heat of condensation of the vapor can be effectively used for vaporizing the low temperature fluid, and the thermal efficiency of the vaporizer is improved.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyasu Miura 38-37 402 Shirahatakami-cho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Yoji Sato 3-32-13 Minoh City Office, Osaka Prefecture (72) Inventor Hitoshi Shoya 61 Hokujouchi, Amagasaki City, Hyogo Prefecture (72) Inventor Seido Ikeda 5-8-21 Fukano, Daito City, Osaka Prefecture

Claims (2)

[Claims] 1. The heat of a heat transfer tube passing through the vaporizing section of a decompression boiler type vaporizer, at a location upstream of the vaporizing section, and an auxiliary heat exchanger provided in a condensate return line from the vaporizing section to the can body. Decompression boiler type carburetor characterized by comprising an exchange means 2. A decompression boiler type vaporizer characterized in that the heat exchange means of claim 1 is constituted by a heat pipe.