JPS61262575A - Method of effectively utilizing heat of vaporization in liquefied-gas evaporator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for effectively utilizing vaporization heat in a liquefied gas vaporizer.

[Prior art]

Conventionally, it has been known to cool propane with a propane cooler, store this cold propane in a tank, and then cool an object to be cooled with a heat exchanger using the cold propane drawn from the tank upon request. There is.

However, this process has drawbacks such as increased capacity of the low-temperature liquefaction tank and increased costs.

[Purpose of the invention]

The present invention aims to overcome the current situation, and aims to reduce the capacity of a low-temperature liquefaction tank, thereby reducing costs.

[Structure of the invention]

That is, the method for effectively utilizing the heat of vaporization in the liquefied gas vaporization apparatus of the present invention is to store the refrigerant that has been liquefied directly by the heat of vaporization of the low-temperature liquefied gas in the first storage tank, and then store the refrigerant in the first storage tank in the cooler. The object to be cooled is cooled by the refrigerant taken out from the refrigerant, and the refrigerant after cooling the object is forcibly compressed and liquefied and stored in a second storage tank. The refrigerant is returned to the liquefied gas vaporizer through the heater.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

In FIG. 1, 31 is an LNG paper riser, and the NG vaporized in the paper riser is transferred to an NGG heating device 32.
It is then sent to the demand destination 40.

The LPG supercooled in LNG paper riser 1 is
The propane transfer pump 36 sends it to a propane cryostat 37 and stores it there, and the required amount is sent to the prine cooler 33 by a second propane transfer pump 38 .

The prine cooler 33 is provided with a brine pipe 41 that cools the refrigerator, and the LPG sent to the cooler 33 is
Here, the LPG exchanges heat with the brine to cool the brine, and the LPG is vaporized into a gaseous state, compressed by a compressor 39 driven by a motor 42, and then cooled by cooling water in a condenser 34. The liquefied LPG is stored in the room temperature tank 35, and only the necessary amount is pre-cooled in the NGG heating device 32 via the line 43, and then transferred to LN.
It is sent to the G paper riser 31.

In addition, in the figure, 44 is a flow rate control valve that controls the LPG flow rate in the line 43. On the other hand, the flow control valve 45
The discharge amount from the pump 38 is adjusted according to the temperature of the pump 38.

In this cooling, the cold energy associated with the vaporization of LNG is converted into supercooling the propane liquid (room temperature), and the supercooled propane is stored in the propane cryostat 37 and taken out as needed. Since the stored cold energy is transmitted to the brine, even if the LNG paper riser operates intermittently, cold energy can be continuously supplied to the brine that cools the refrigerator.

In this example, LPG is used as the refrigerant, and the cold energy of LNG is directly transmitted to the LPG, so the refrigerant price is low.
You can roam around devices that are easy to control.

If a LOOT/D cold/heat refrigerator is planned using this example device, its refrigerating capacity will be 500 RT. A refrigerator with a refrigeration capacity of 500 RT requires approximately 1,800 watts of power, but by using this device, approximately 500 watts of power is required.
00, W.

This means that only 100% of the power is required, resulting in significant power savings.

At this time, the temperature conditions of each device are as follows, and the Molière chart in that state is shown in FIG.

Temperature conditions for each part of each equipment ■ LNG vapor riser: LNG inlet temperature knee 162℃ LNG outlet temperature knee 80℃ ■NGG heater: NG inlet temperature knee 80℃ G outlet temperature knee 25℃ LNG vapor riser: Propane inlet temperature knee 40℃ Propane outlet temperature knee 70℃ ■ NGG heater: Propane inlet temperature knee 40℃ Propane outlet temperature knee 40℃ ■ Propane cold tank (maintenance temperature) knee 65℃ ■ Brine cooler: Propane inlet temperature knee 65℃ Propane outlet temperature knee 35℃ ■ Propane condenser: Propane condensation temperature knee 40℃ Cooling water inlet temperature knee 30℃ ■ Propane compressor: Suction gas temperature knee 35℃ [Effects of the Invention] As described above, the present invention is capable of vaporizing low temperature liquefied gas A refrigerant that has been directly liquefied by heat is stored in a first storage tank, and then an object to be cooled is cooled by the refrigerant taken out from the first storage tank in a cooler, and then the object to be cooled is cooled. After being forcibly compressed, the refrigerant is liquefied and stored in the second storage tank, and then the refrigerant in the second storage tank is returned to the liquefied gas vaporizer via the heater, so the small size of the low-temperature liquefaction tank is Capacity can be increased,
Cost reduction becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the apparatus used to carry out the method of the present invention;
The figure is a Mollier chart of propane in the apparatus of FIG. 31... LNG paper riser, 32... NG heater, 33... Brine cooler, 34... Condenser,
35... Propane room temperature tank, 36... First propane transfer pump, 37... Propane cold tank, 38... Second
10 Pan transfer pump, 39... Compressor, 41... Pline pipe, 43... Propane line.

Claims (1)

[Claims] A method for utilizing the heat of vaporization in a liquefied gas vaporizer having vaporization equipment that operates intermittently to vaporize low-temperature liquefied gas, the method comprising directly transferring the refrigerant liquefied by the heat of vaporization of the low-temperature liquefied gas to a first storage tank. After that, the object to be cooled is cooled by the refrigerant taken out from the first storage tank in a cooler, and the refrigerant after cooling the object is forcibly compressed and then liquefied to the second storage tank. 1. A method for effectively utilizing vaporization heat in a liquefied gas vaporizer, characterized in that the refrigerant in the second storage tank is stored in a second storage tank and then returned to the liquefied gas vaporizer via a heater.