JPH054639Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is designed to connect the first tube for passing heat source water to the liquid in the first tank in order to vaporize liquefied natural gas using seawater as heat source water. A plurality of tubes for passing low-temperature liquefied gas are provided in the first tank to be immersed in the intermediate heat medium, and a plurality of tubes for passing low-temperature liquefied gas are provided in the first tank, and the tubes are connected to the outlets of the plurality of tubes for passing low-temperature liquefied gas. A vaporizer for low-temperature liquefied gas, in which a second tank is connected to the gas collection chamber by a gas recovery path, a second tube for passing heat source water is provided in the second tank, and a product gas recovery path is connected to the second tank. .

[Conventional technology]

Conventionally, as shown in FIG. 3, low-temperature liquefied gas is supplied to each of a large number of low-temperature liquefied gas passage tubes 3 from a distribution chamber 5 communicating with a low-temperature liquefied gas supply pipe 4, and a heat source is used in a first tank 1. No. 1 for water passage
The tube 2 vaporizes a liquid intermediate heat medium L such as propane or chlorofluorocarbon, and the gaseous intermediate heat medium heats the tube 3 for passing low-temperature liquefied gas.
The low-temperature liquefied gas in the tank is vaporized, and the gas obtained by vaporization is transferred to the second tank 1 in the gas collection chamber 7 and the gas recovery path 6.
2, and is heated in the second tank 12 by the second tube 13 for passing heat source water to the gas recovery path 6.
The gas from the tank was heated from about -20° C. or lower to about room temperature, and the gas at about room temperature was sent to the product gas recovery path 15. In addition, the heat source water is supplied from water supply pipe 1.
8. Distribution pipe 19, second tube 1 for heat source water passage
3. The heat source water is sent to the collection and distribution chamber 20, the first tube 2 for passing through the heat source, the collection chamber 22, and the drain pipe 21 in this order, and the second tank 12 is provided with a bathtub 14 in parallel. , the gas is configured to sufficiently contact the second tube 13 for passing heat source water.

[Problem that the invention attempts to solve]

However, in actual operation, the low-temperature liquefied gas is not completely vaporized in the low-temperature liquefied gas passage tube 3, but is sent into the second tank 12 in the form of a mist, and the low-temperature liquefied gas is sent into the second tank 12 through the heat source water passage tube 3. There was a risk that the specific portion 13a of 13 would be overcooled due to contact with the mist-like low-temperature liquefied gas.

When supercooling occurs in the specific portion 13a, ice forms on the inner surface of the second tube 13, the effective diameter of the second tube 13 decreases, and the flow rate of the heat source water increases significantly. Cavitation occurred and the second heat source water passage tube 13 was damaged by erosion.

An object of the present invention is to reliably prevent damage caused by freezing of a heat source water passage tube caused by mist-like low-temperature liquefied gas, and to reduce equipment costs for this purpose.

[Means for solving problems]

The characteristic configuration of the present invention is that a mist separator is provided inside the connection part with the gas recovery passage formed in the upper part of the gas collecting chamber that communicates with the exits of the numerous low temperature liquefied gas passage tubes, and the mist separator is provided in the lower part of the gas collecting chamber. A drain recovery path is connected to the second tank, one end of which is connected to the drain recovery path, and a drain dispersion means is provided at the other end to heat the condensate that advects inside by heat exchange with the gas in the second tank. It is equipped with a drain heating pipe, and its functions and effects are as follows.

[Effect]

In other words, even if the low-temperature liquefied gas is not completely vaporized by heating by the gaseous intermediate heat medium in the low-temperature liquefied gas passage tube, the mist separator prevents the low-temperature liquefied gas from flowing into the gas recovery path. This can be reliably prevented, and the mist-like low-temperature liquefied gas can be taken out from the gas collecting chamber through the drain recovery path.

Therefore, as gas is supplied from the gas recovery path into the second tank, it is possible to reliably prevent an inconvenient situation in which a specific portion of the second tube for passing heat source water in the second tank is overcooled, thereby preventing freezing. Erosion of the second tube for heat source water passage caused by this can be sufficiently eliminated.

Furthermore, compared to installing a special mist removal device in the gas recovery path, it is only necessary to install a mist separator such as a wire mesh at the cylindrical connection between the gas collection chamber and the gas recovery path. Therefore, the cost of equipment for removing mist can be greatly reduced.

Furthermore, a drain heating pipe is provided to advect the drain from the drain recovery path into the second tank, and to exchange heat with the gas in the second tank in the drain heating pipe to heat and partially vaporize the drain.
Since the heated drain is dispersed and vaporized by the drain dispersing means, it is possible to avoid overcooling of a specific part due to concentrated adhesion of the drain in the second tube in the second tank. By adopting such a device configuration, it is possible to make the gas components in the product gas recovery path constant even when the LG is multi-component.

At this point, it may be possible to return the drain to the LG supply pipe or distribution room, but this drain may be contaminated with vaporized components, and the temperature difference required for efficient heat exchange may be reduced to the second tank. The above configuration is preferable because it is easier to use the internal configuration.

〔Example〕

Next, an example will be shown with reference to FIGS. 1 and 2.

A first tank 1 accommodates an intermediate heat medium such as propane or fluorocarbon, and a number of first tubes 2 for passing heat source water are provided in the first tank 1 by being immersed in a liquid intermediate heat medium L, A large number of U-shaped tubes 3 for passing the low-temperature liquefied gas LG are installed in the first
It is located above the liquid intermediate heat medium L in the tank 1, and the liquid intermediate heat medium L is vaporized by heating with the heat source water, the LG is vaporized by the gaseous intermediate heat medium, and the gaseous intermediate heat medium is It is configured to condense the medium.

Both ends of all the U-shaped tubes 3 are connected separately to a distribution chamber 5 that communicates with the LG supply pipe 4 and a gas gathering chamber 7 that communicates with the gas recovery path 6.
The connecting portion 8 of the gas recovery path 6 and the gas recovery passage 6 is formed into a cylindrical shape that can be freely opened at the flange 8a, and is provided in the upper part of the gas collecting chamber 7, and a mist separator 9 such as a wire mesh is provided in the connecting portion 8 to prevent the mist. LG gas recovery route 6
It is structured so that it does not flow into the

A guide 10 is provided to guide the LG flowing down from the mist separator 9 to the lower part of the gas collecting chamber 7, and a drain recovery path 11 is connected to the lower part of the gas collecting chamber 7 to collect the mist-like LG and take it out from the gas collecting chamber 7. It is configured so that it can be released. In addition, a heat insulating material 12 is provided on the partition wall between the distribution chamber 5 and the gas gathering chamber 7, so that the distribution chamber 5
Cooling by the LG prevents drainage from occurring in the gas collecting chamber 7.

A second tank 12 is connected to the gas recovery path 6, and a large number of second tubes 13 for passing heat source water are provided in the second tank 12 to form a zigzag gas flow path in the second tank 12. A large number of Batsufuls 14 are arranged in parallel, and the gas is brought into contact with the second tube 13 repeatedly, and the gas sent from the gas recovery path 6 at about -20°C or lower is heated to about room temperature by heating with heat source water. The product gas is supplied to a product gas recovery path 15 connected to the second tank 12.

The drain recovery path 11 is connected to one end of the drain heating pipe 16 provided in the second tank 12, and the drain spraying nozzle 17 is connected to the other end, and the LG from the gas collecting chamber 7 is
is preheated by the gas in the second tank 12 with the drain heating pipe 16, and can be instantly vaporized by spraying from the nozzle 17, and even if the LG is multi-component, the gas components in the product gas recovery path 15 are It is configured so that it can be made constant.

A distribution chamber 19 communicating with the water supply pipe 18 is connected to one end side of all the second tubes 13, and a collection and distribution chamber 20 is formed.
is connected to the other end side of all the second tubes 13 and one end side of all the first tubes 2, and the gathering chamber 22 communicating with the drain pipe 21 is connected to the other end side of all the first tubes 2, and the heat source water is connected to the other end side of all the first tubes 2. The configuration is such that the data is sent from the second tube 13 to the first tube 2.

[Another example] Next, another embodiment will be described.

The material, installation condition, and other aspects of the mist separator 9 can be changed as appropriate.

The first and second tubes 2, 13 for passing heat source water and the tube 3 for passing low-temperature liquefied gas have different shapes, number of installations,
Others can be changed as appropriate.

First tube 2 and second tube 1 for passing heat source water
3 may be connected in parallel to a heat source water supply device, and the heat source water can be appropriately selected from seawater, fresh water, waste water, etc.

The low-temperature liquefied gas may be LNG, LPG, LN, or any other gas.

[Effect of idea]

As a result, the second tube for passing heat source water to obtain room temperature product gas can be reliably protected from damage due to erosion, and the equipment cost can be reduced, and the low temperature is advantageous in terms of both durability and economy. A vaporizer for liquefied gas was obtained.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view showing an embodiment of the present invention, and FIG. 2 is a partially enlarged view of FIG. 1. FIG. 3 is an overall sectional view of a conventional example. 1... First tank, 2... First tube for passing heat source water, 3... Tube for passing low temperature liquefied gas, 6
...Gas recovery path, 7...Gas collection chamber, 8...Connection section, 9...Mist separator, 11...Drain recovery path, 12...Second tank, 13...Second tube for passing heat source water, 15...Product gas recovery path, 17
...Nozzle, L...Liquid intermediate heat medium.

Claims (1)

[Claims for Utility Model Registration] A first tube 2 for passing heat source water is immersed in the liquid intermediate heat medium L in the first tank 1, and a number of tubes 3 for passing low-temperature liquefied gas are provided in the first tank 1. A second tank 12 is connected by a gas recovery path 6 to a gas collection chamber 7 which is located above the liquid intermediate heat medium L and communicates with the outlet of the plurality of low temperature liquefied gas passage tubes 3, and the heat source water is passed through the gas collection chamber 7. 2nd tube 13
is provided in the second tank 12 and a product gas recovery path 15 is connected to the second tank 12. Mist separator 9 inside
A drain recovery path 11 is connected to the lower part of the gas collecting chamber 7, and the drain recovery path 1 is connected to the second tank 12.
1 at one end, and a drain dispersion means 17 at the other end.
A vaporizer for low-temperature liquefied gas, which is equipped with a drain heating pipe 16 that heats drain flowing inside by heat exchange with the gas in the second tank 12.