JP2756180B2 - Low temperature liquefied gas vaporizer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for vaporizing a low-temperature liquefied gas such as LPG or LNG.

2. Description of the Related Art As an apparatus for vaporizing a low-temperature liquefied gas, an open rack vaporizer as shown in FIGS. 2 and 3 is known.

This vaporizer uses seawater pump 2a to once pump header 3a.
In this configuration, water is injected from the header 3a into the trough 4a, heat is exchanged by overflowing seawater from the trough 4a along the heat exchange panel 1a, and the low-temperature liquefied gas is vaporized.

[Problems of the prior art] However, the above-mentioned known examples have the following problems.

a. In order to equalize water spray from the trough 4a, restrictors for preventing drift are provided at various places of the header 3a. For this reason, resistance increases, and it is necessary to increase the head of the water distribution pump 2a.

b. In order to prevent breakage of the water spray film on the heat exchange panel 1a, even when the seawater temperature is high, the amount of seawater that is higher than the heat required for vaporization is pumped and flown. For this reason, an excessive power cost is required.

c. Since seawater used for vaporization is drained as it is, there is a waste of cold heat.

An object of the present invention is to propose a low-temperature liquefied gas vaporizer that does not have the problems described in the above a to c.

[Means for Solving the Problems] The configuration of the present invention is as follows.

The vaporizer tower is divided into a decompressible intermediate heat medium liquid vaporization chamber and a low-temperature liquefied gas vaporization chamber.In the intermediate heat medium liquid vaporization chamber, a heat exchanger for intermediate heat medium liquid vaporization is inserted, and a bleeding pump is installed. Attach and introduce hot water such as seawater.In the low temperature liquefied gas vaporization chamber, insert a heat exchanger for low temperature liquefied gas vaporization and vaporize with the intermediate heat medium liquid vaporization heat exchanger. At the bottom of the low-temperature liquefied gas vaporization chamber, an intermediate heat medium liquid recovery device is attached, and the intermediate heat medium liquid recovery device and the intermediate heat medium liquid vaporization heat exchanger are introduced. A low-temperature liquefied gas vaporizer, characterized in that:

[Action] A heat source water such as seawater is introduced into the intermediate heat medium liquid vaporization chamber, and the heat source water is evaporated by reducing the pressure in the heat medium liquid vaporization chamber. The evaporated water vapor heats the intermediate heat medium liquid vaporizing heat exchanger to evaporate the intermediate heat medium liquid therein. The vaporized heat medium vapor is introduced into the low-temperature liquefied gas vaporization chamber, where it heats the low-temperature liquefied gas vaporization heat exchanger and vaporizes the low-temperature liquefied gas inside. The intermediate heat medium liquid condensed by applying heat to the low-temperature liquefied gas is recovered by the intermediate heat medium liquid recovery device, introduced again into the intermediate heat medium liquid vaporization heat exchanger, and re-vaporized to vaporize the low-temperature liquefied gas. I do.

The low-temperature liquefied gas is thus vaporized and sent to the consumer. The hot heat source water is sucked from the water source by a depressurizing action (vacuum action) based on condensation of water vapor in the intermediate heat medium liquid vaporization chamber, and a suction pump is used as an auxiliary.

On the other hand, the condensed heat source water is drained by a drain pump.

Embodiment FIG. 1 shows an embodiment of the present invention. The reference numeral 1 designates a vaporizer tower, in which the intermediate heating medium liquid vaporizing chamber 3 is formed by a partition wall 2 in the lower stage and the low temperature liquefied gas vaporizing chamber 4 is formed in the upper stage.
Are formed.

Reference numeral 5 denotes a suction pipe for sucking seawater as a heat source water into the intermediate heat medium liquid vaporization chamber 3, and a valve 6 is provided on the way. In addition, a suction pump 5a is also attached to the suction pipe 5.

Reference numeral 7 denotes a heat exchanger for an intermediate heat medium liquid inserted into the intermediate heat medium liquid vaporization chamber 3, in which the intermediate heat medium liquid circulates.

Reference numeral 8 denotes a heat exchanger for the low-temperature liquefied gas inserted into the low-temperature liquefied gas vaporization chamber 4, through which the low-temperature liquefied gas passes.

Reference numeral 9 denotes a circulation path in which the intermediate heat medium liquid condensed in the low-temperature liquefied gas vaporization chamber 4 and accumulated on the partition plate 2 returns to the intermediate heat medium liquid heat exchanger 7, and hereinafter the partition plate 2 and the circulation path 9 are used. Therefore, it is referred to as an intermediate heat medium liquid recovery device.

10 is an extraction pump, 11 is a seawater drainage pit, 12 is a drainage pump, and 13 is a drainage channel.

 The operation of the above embodiment will now be described.

The bottoms of the intermediate heat medium liquid heat exchanger 7 and the low temperature liquefied gas vaporization chamber 4 are filled with an intermediate heat medium liquid that evaporates and evaporates due to the temperature of the seawater. A low-temperature liquefied gas is introduced from the inlet 8a, and the vaporized gas is sent from the outlet 8b to the consuming side.

In the intermediate heat medium liquid vaporization chamber 3, the non-condensable gas in the introduced seawater is degassed by the bleeding pump 10, and the pressure is reduced to generate steam.

This water vapor rises and heats the intermediate heat medium liquid in the heat exchanger for intermediate heat medium liquid 7, whereby the intermediate heat medium liquid evaporates in the low-temperature liquefied gas vaporization chamber 4, and the heat of the low-temperature liquefied gas heat The low temperature liquefied gas in the exchanger 8 is heated and vaporized.

On the other hand, the water vapor that has given heat to the intermediate heat medium liquid condenses and accumulates at the bottom in the intermediate heat medium liquid vaporization chamber 3 to form a drain pit 11.
Flows to the side.

Further, seawater is sucked into the intermediate heat medium liquid vaporization chamber 3 evacuated by condensation of the water vapor via the suction pipe 5 by a differential pressure.

[Effects of the Present Invention] The present invention has the above configuration and operation, and can expect the following effects.

a. Since the pressure in the intermediate heat medium liquid vaporization chamber is reduced by the vacuum effect associated with the vaporization of the intermediate heat medium liquid and its condensation, the heat source water can be sucked by this pressure reduction effect. As a result, the pump for fetching and drawing hot water can be eliminated or installed, but its head may be small.

Therefore, it is possible to reduce the size of the equipment and the operating cost.

b. Since the intermediate heat medium liquid and the hot heat source water are separated, there is no loss of the intermediate heat medium liquid.

c. Since the heat source water is introduced directly into the intermediate heat medium liquid vaporization chamber, the configuration of the conventional header or trough becomes unnecessary, and the initial cost of the apparatus is reduced.

d. Since the low-temperature liquefied gas is vaporized by using the vaporized vapor of the intermediate heat medium liquid, the selection of the intermediate heat medium liquid having a low freezing temperature does not cause the icing phenomenon to occur in the heat exchanger for the low-temperature liquefied gas. There is no performance degradation when the load changes.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a vaporizer according to the present invention, and FIGS. 2 and 3 are explanatory views of a conventional open rack type vaporizer. DESCRIPTION OF SYMBOLS 1 ... Vaporizer tower 2 ... Partition plate 3 ... Intermediate heat medium liquid vaporization chamber 4 ... Low temperature liquefied gas vaporization chamber 5 ... Suction pipe 6 ... Valve 7 ... Intermediate heat medium liquid heat exchanger 8 ... … Heat exchanger for low temperature liquefied gas 9… Circulation path 10… Bleed pump 11… Drain pit 12… Drain pump 13… Drain channel

Claims (1)

(57) [Claims] 1. The vaporizer tower is divided into a decompressible intermediate heat medium liquid vaporization chamber and a low-temperature liquefied gas vaporization chamber, and a heat exchanger for intermediate heat medium liquid vaporization is inserted into the intermediate heat medium liquid vaporization chamber. At the same time, a bleeding pump was installed, and a heat source water such as seawater was further introduced.A heat exchanger for low temperature liquefied gas vaporization was inserted into the low temperature liquefied gas vaporization chamber, and the intermediate heat medium liquid vaporization The intermediate heat medium liquid recovery device is attached to the bottom of the low temperature liquefied gas vaporization chamber, and the intermediate heat medium liquid recovery device and the intermediate heat medium are introduced. A low-temperature liquefied gas vaporizer, characterized in that it communicates with a liquefier heat exchanger.