JPH11190496A - Air fin type carburetor for liquefied gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a trouble wherein the temperature of vaporized gas is not controllable by a conventional air fin type vaporizer utilizing vaporized atmosphere as a heat source, and in a forced convection type, even when an airflow is increased, the temperature of vaporized gas is not raised to a value higher than atmosphere temperature, and when it is raised to a value higher than atmosphere temperature, it is necessary that heating equipment utilizing a hot water boiler as a heat source be arranged as attendant equipment in a spot situated downstream from the heating part. SOLUTION: A vaporizing part 2 for vaporized gas and a heating part 4 for vaporized gas are arranged in separate spaces 6a and 6b. It is proposed that an air fin type vaporizer consisting of a temperature raising means for the atmosphere and a forced convection means to forcibly ventilate the atmosphere, the temperature of which is raised, is arranged in a space where the heating part is arranged. In this case, the temperature raising means for the atmosphere comprises a combustion apparatus to use vaporized gas, present downstream from the heating part, as fuel; and a mixer of combustion gas and the atmosphere. There is no need for large scale auxiliary equipment as in a conventional type.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas air fin vaporizer.

[0002]

2. Description of the Related Art An air fin type vaporizer for evaporating a liquefied gas using atmospheric heat is constituted by vertically arranging heat transfer tubes in which fins and tubes are integrally formed by extrusion molding, and connecting these tubes. In this configuration, a liquefied gas evaporator is provided on the upstream side and a vaporized gas heater is provided on the downstream side, and a plurality of units are combined in parallel according to the amount of liquefied gas evaporated. In this evaporator, the evaporating section is composed of parallel heat transfer tubes connected to the header pipe, and the heating section is composed of series heat transfer pipes connected by the vent pipe. Some of the warm parts are connected in series by a vent pipe.

FIGS. 5 and 6 show a conventional example of an air fin type vaporizer. FIG. 5 shows a natural convection type, and FIG. 6 shows a forced convection type. As can be seen from these figures, in the former, both the evaporating section and the heating section are arranged in the atmosphere, and heat exchange is performed with the atmosphere that naturally convects in the heat transfer tube. In the latter, both the evaporating section and the heating section are arranged in an enclosed space, and a forced convection means is installed to exchange heat with the forced convection air in the heat transfer tube. In any case, since the atmospheric heat is used as it is, energy saving can be expected as compared with the case where hot water or steam is used as a heat source, and the boiler and other auxiliary equipment are not required, and the equipment has a simple configuration.

[0004]

However, such an air fin type vaporizer using the atmosphere as a heat source has the following problems. a. If the evaporation amount is constant, the temperature of the vaporized gas cannot be controlled to a desired temperature because it is affected by the atmospheric temperature, humidity, air volume, etc., for example, the temperature of the vaporized gas when frost forms on the heat transfer surface Decrease. b. In the case of the forced convection method, the temperature of the vaporized gas can be increased by increasing the air volume, but in any case, it cannot be increased to a temperature higher than the atmospheric temperature. c. When it is necessary to raise the temperature of the vaporized gas to the atmospheric temperature or higher, for example, as shown in FIG. 7, a hot water boiler or the like is provided on the downstream side of the heating section separately from the air fin type vaporizer. It will be necessary to install a heating facility as an additional facility. An object of the present invention is to solve such a problem.

[0005]

According to the present invention, there is provided an air fin type vaporizer in which a liquefied gas is caused to flow through a heat transfer tube and vaporized using atmospheric heat. Fin type carburetor in which the heating portions of the heated gas are arranged in separate spaces, and the space in which the heating portions are arranged is provided with a heating means for the air and a forced convection means for forcibly ventilating the heated air. Suggest.

According to the present invention, in the above configuration,
It is proposed that the means for raising the temperature of the atmosphere be constituted by a combustor using vaporized gas on the downstream side of the heating section as a fuel, and a mixer of the combustion gas and the atmosphere.

According to the present invention, in the above configuration,
It is proposed that the space of the evaporator and the heater is the enclosed space, and that the space in which the evaporator is arranged also includes forced convection means. According to the present invention, in this case, each space of the evaporator and the heater may be configured as a space adjacent to each other via a partition, or a space surrounded by each of the evaporator and the heater may be used. They may be separated.

Further, the present invention proposes, in the above-described configuration, that the space of the heating section is an enclosed space and the space of the evaporating section is a space open to the atmosphere.

Further, in the present invention, in the above configuration, the blower, which is an element of the forced convection means, is basically installed with the suction side corresponding to the space. , The discharge side can be installed corresponding to the space.

According to the present invention described above, the temperature of the vaporized gas can be raised to the atmospheric temperature or higher by forcibly convection the heated atmosphere into the heating section constituting the air fin vaporizer. At this time, since the heated atmosphere is forcedly convected in a space surrounding only the heating section, the temperature of the vaporized gas can be efficiently raised with a small amount of fuel.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 conceptually shows a first embodiment of an air fin type vaporizer according to the present invention. Reference numeral 1 denotes a heat transfer tube. The heat transfer tube 1 is formed integrally with a fin and a tube by extrusion molding in the same manner as in the related art, and a plurality of tubes are arranged vertically and connected by a tube to form a flow path. .
Reference numeral 2 denotes an evaporator, and the evaporator 2 is configured by connecting a plurality of heat transfer tubes 1 in parallel between upper and lower header tubes 3.
Reference numeral 4 denotes a heating unit, and the heating unit 4 includes a plurality of heat transfer tubes 1.
Are connected in series by a vent pipe 5. still,
As described above, the connection form of the heat transfer tube 1 in the evaporation unit 2 and the heating unit 4 is appropriate, such as a configuration in which both the evaporation unit 2 and the heating unit 4 are connected in series by a vent pipe. Is also appropriate. For example, in the heating section 4, an annular fin tube or the like can be used, and the heating section 4 can be arranged horizontally.

The evaporating section 2 and the heating section 4 are disposed in separate enclosed spaces 6a and 6b, respectively.
b is a configuration adjacent to the partition 7. In each of the spaces 6a and 6b, air introduction sections 8a and 8b and derivation sections 9a and 9b are provided at positions separated by the evaporating section 2 and the heating section 4, respectively. 10b
Is installed to constitute the forced convection means. in this case,
The blowers 10a and 10b are installed with their suction sides corresponding to the spaces 6a and 6b. The introduction portion 8a of the space 6a is in communication with the atmosphere, and the introduction portion 8b of the space 6b is in communication with the means for raising the temperature of the atmosphere. In order to easily distribute the air (heated air) as a heat source uniformly to each heat transfer tube 1, the installation side of the blowers 10a and 10b has the suction side in each of the spaces 6a and 6b as described above. In principle, the heaters are installed in such a manner that, if they are not uniform, apart from the evaporator 2, which causes inconvenience such as frosting, the heating side 4 in which such inconvenience does not occur, the discharge side is defined as the space 6 b It is also possible to adopt a push-in type corresponding to the above.

FIG. 2 is a system diagram showing an embodiment of the means for raising the temperature of the atmosphere. In this embodiment, the heat source is a combustor that burns gas vaporized by the air fin vaporizer as fuel according to the present invention. is there. That is, reference numeral 11 denotes a combustor, and the combustor 11 is configured to use the gas of the vaporized gas system 12 downstream of the air fin type vaporizer as fuel. The combustion gas from the combustor 11 is introduced into the mixer 13, where it is mixed with the atmosphere and heated to a predetermined temperature.
From the space 6b. The means for raising the temperature of the atmosphere can be appropriately configured in addition to the above embodiment.

In the above configuration, the liquefied gas introduced into the evaporating section 2 in the space 6a evaporates by heat exchange in the heat transfer tube 1 with the atmosphere forcedly convected by the forced convection means. The evaporated liquefied gas is then supplied to the heating section 4 in the space 6b.
And heat-exchanged in the heat transfer tube 1 with the heated air that has been forcedly convected by the forced convection means, and the temperature has been increased.
It is led out via the vaporized gas system 12.

At this time, the temperature raising means controls the amount of combustion in accordance with the change in the atmospheric temperature, so that the temperature of the vaporized gas can be kept at a predetermined temperature or higher regardless of the change in the atmospheric temperature in winter or summer. it can. This control of the amount of combustion can be performed as control for setting the atmospheric temperature, the temperature of the heated air, or the temperature of the vaporized gas to a predetermined temperature.

Next, FIG. 3 conceptually shows a second embodiment of the air fin type vaporizer according to the present invention. In the second embodiment, the respective spaces 6a and 6b surrounding the evaporating unit 2 and the heating unit 4 are separated from each other, and the other components are the same as those in the first embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and duplicate description will be omitted.

Next, FIG. 4 conceptually shows a third embodiment of the air fin type vaporizer according to the present invention. In the third embodiment, the evaporating section 2 is not disposed in the enclosed space as in the first and second embodiments, but is disposed in a space open to the atmosphere. Meanwhile, the heating unit 4
Are arranged in the enclosed space 6b as in the first and second embodiments. Also in this embodiment, the first and second
The same components as those of the embodiment are denoted by the same reference numerals as those in FIG. In this embodiment, the liquefied gas first evaporates by exchanging heat with the natural convection air in the heat transfer tube 1 of the evaporator 2, and then is introduced into the heating unit 4 in the space 6b, and is forced by the forced convection means. The heat is exchanged with the heated convection heated air in the heat transfer tube 1 and the temperature is raised.

Here, an example of operation in the first and second embodiments will be described. When a sufficient forced convection effect is obtained by the respective forced convection means, for example, LNG is set to 1 (t
/ H) In the case of vaporization, a ventilation amount of about 100 (t / h) is secured, and this ventilation amount is supplied to the evaporating section 2 at 75 (t / h),
The flow rate is distributed to the heating unit 4 at 25 (t / h). In this operation, if the atmospheric temperature is 0 ° C. and the vaporized temperature is 10 ° C., the space 6 in which the evaporating unit 2 and the heating unit 4 are disposed is assumed.
When the heated air is introduced into both a and b, the amount of fuel gas supplied to the combustor 11 of the heating means is 30 kg / h.
However, as in the present invention, when the heated air is introduced only into the space 6b in which the heating unit 4 is arranged, 10 kg
/ h fuel gas amount is enough, and fuel cost can be reduced.

[0019]

As described above, the present invention has the following effects. a. The air, which is the heat source of the air fin type vaporizer, is heated and introduced into the enclosed space where the heating section is located, and heat exchange is performed in the heat transfer tubes. Vaporized gas can be obtained. b. Since the heated atmosphere is introduced only into the enclosed space in which the heating unit is arranged, it is possible to obtain the temperature of the vaporized gas equal to or higher than a predetermined value with a small amount of fuel, thereby reducing the fuel cost. c. The means for raising the temperature of the atmosphere can be composed of a combustor using vaporized gas on the downstream side of the heating section as a fuel, and a mixer of the combustion gas and the atmosphere. It is.

[Brief description of the drawings]

FIG. 1 is an explanatory view conceptually showing a first embodiment of an air fin type vaporizer according to the present invention.

FIG. 2 is a system diagram showing an embodiment of a means for raising the temperature of the atmosphere.

FIG. 3 is an explanatory view conceptually showing a second embodiment of an air fin vaporizer according to the present invention.

FIG. 4 is an explanatory view conceptually showing a third embodiment of an air fin vaporizer according to the present invention.

FIG. 5 is an explanatory view conceptually showing a conventional example of an air fin type vaporizer.

FIG. 6 is an explanatory view conceptually showing another conventional example of an air fin vaporizer.

FIG. 7 is a system diagram showing a conventional auxiliary facility for raising the temperature of a vaporized gas.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat transfer pipe 2 Evaporation part 3 Header pipe 4 Heating part 5 Vent pipe 6a, 6b Enclosed space 7 Partition 8a, 8b Introducing part 9a, 9b Outing part 10a, 10b Blower 11 Combustor 12 Vaporized gas system 13 Mixer

Claims (8)

[Claims] In an air fin type vaporizer in which a liquefied gas is caused to flow through a heat transfer tube and evaporates using atmospheric heat, an evaporating section for a liquefied gas and a heating section for a vaporized gas are arranged in separate spaces, respectively. A liquefied gas air-fin type vaporizer characterized in that a space in which the warming section is arranged is constituted by a means for raising the temperature of the atmosphere and a forced convection means for forcibly ventilating the heated atmosphere. 2. The air temperature raising means comprises a combustor using vaporized gas downstream of the heating section as a fuel, and a mixer of the combustion gas and the air. Liquefied gas air fin vaporizer 3. The air-fin type liquefied gas system according to claim 1, wherein the space of the evaporator and the heater is a space surrounded by the evaporator, and the space in which the evaporator is disposed also comprises forced convection means. Vaporizer 4. The liquefied gas air-fin vaporizer according to claim 3, wherein the respective spaces of the evaporating section and the heating section are adjacent to each other via a partition. 5. A liquefied gas air-fin type vaporizer according to claim 3, wherein a space surrounded by each of the evaporating section and the heating section is separated from each other. 6. A liquefied gas air fin vaporizer according to claim 1, wherein the space of the heating unit is a surrounded space, and the space of the evaporation unit is a space open to the atmosphere. 7. The air fin type vaporization of a liquefied gas according to claim 1, wherein the blower, which is an element of the forced convection means, is installed with a suction side corresponding to a space. vessel 8. The liquefied gas according to claim 1, wherein the blower, which is an element of the forced convection means of the heating section, is installed with the discharge side corresponding to the space. Air fin vaporizer