JPS62162865A - Method of storing cold heat energy - 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 storing the cold energy of low temperature liquefied gas such as UC.

[Invention! Scenery]

Currently, there are several LNG plants in Japan, some of which are under construction.
There are receiving terminals such as LNG, and the cold energy of low-temperature liquefied gas such as LNG is used for cold power generation and frozen warehouses.

However, because the consumption of LNG etc. fluctuates depending on the season and the time of day, and because this cold energy is difficult to store, only about 30% of the base load is used, and other cold energy is not used. The current situation is that it is being dumped.

Therefore, a large amount of cold energy has to be discarded as described above, and there is a great demand for effective use of cold energy in the gas industry and TTS industry, which use large amounts of LNG and the like.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it solves the problems of the prior art by simple and rational means, and converts the tfJ thermal energy used to obtain low-temperature liquefied gas into a single high-pressure liquid medium. A gas medium obtained by storing this cold energy, taking it out and using it as appropriate, and then using a chemical M heat material 17 to carry the gas medium after this use, and heating this chemical heat storage material. The objective is to provide a method that allows cold energy to be effectively used and stored without having to be dumped by cycling and storing it.

[Means for solving problems]

The configuration of the present invention that solves the conventional problems is that when storing the cold heat of low-temperature liquefied gas such as LNG, alemonia, propane, butane, etc. are used as 'tfJ heat storage media, and the gases of these media are transferred to the cold heat exchanger. The liquefied medium is converted to 1α by the cold heat of the low-temperature liquefied gas, and the pressure of this liquefied medium is increased using a pump or other means.Then, the temperature is raised using a heat exchanger using seawater or the like to obtain a liquid medium at room temperature and high pressure. The medium is then stored in a medium storage tank, and then taken out as appropriate and sent to an expansion valve to expand to a low-temperature, low-pressure state to supply cold heat to a refrigerated warehouse or the like. The converted medium is absorbed into liquid chemical M heat material in a gas absorption tank.
Alternatively, after adsorbing and storing this, the chemical heat storage material is heated under reduced pressure in a gas release tank to obtain a gas medium similar to the above, and this is circulated and fed to the cold heat exchanger. This system is characterized in that the chemical heat storage material released as gas is pressurized by a pump and then sent back to the gas absorption tank.

[Example 1] (Fig. 1) A first example of the method of the present invention will be described using the equipment shown in Fig. 1. For this example and the following examples, M ・nNf(t (liquid) ten n' NJ (gas)
22 & L n' N113 (liquid) Use chemical M heat materials in the relationship.

At the point of origin, a gaseous medium (n' NFI, ) at room temperature and low pressure, supplied from a gas discharge tank (described later), is heat exchanged with the cold energy of low-temperature liquefied gas such as LNG in the cold heat exchanger 1 to produce low-temperature and low-pressure gas. To liquefy I7, this liquefied medium is stored in the liquefied tank 2 and is pressurized by the pressure booster 3 and subjected to heat exchange using aqueous humor or the like. The medium is heated to a temperature of 44°C, and the medium becomes a liquid medium at room temperature and high pressure. This RTL-like medium is temporarily stored in the medium storage tank 5 at room temperature and high pressure. This medium is taken out as required by the load side, and the expansion
It is expanded to a low-temperature, low-pressure state, and is used to supply cold heat to negative +-:i 7 such as offshore freezers. The endothermic gasified medium (n'Nl[,l) in the load 7 is converted into a liquid chemical heat storage material (for example, Nal.
+ ) to obtain liquid M-n' MHI (for example, liquid for Na1n#NH3). The heat generated at this time is used for heat pumps, etc. That is, the medium (n' N11
-1) is supplied into the gas absorption tank 8, and the liquid chemical N thermal material (for example, Mal・nN11r
) (This chemical heat storage material can be adsorbed or absorbed by, for example,
Nal・n'Nil). This chemical heat storage material is stored in a storage tank 10 by a pump 9. This stored liquid chemical heat storage material is lowered in temperature and pressure by an expansion valve 11 and sent to a gas release tank 12, where it is heated by a heat medium such as seawater or air that is easily available, and absorbed. The gas medium (n' N113 ) generated is sent to the cold heat exchanger 1 through the gas purification equipment 13 as appropriate, and then the cold heat is recovered and used as described above, and the gas medium is used for chemical heat storage. A cyclical cycle of absorption and release into materials takes place.

The chemistry that released the gaseous medium? ? During the transfer, the heat material passes through the boost pump 14 and is heated to high pressure and transferred to the storage tank 15.
stored in This stored chemical heat storage material is taken out as required by the gas absorption tank, and is heated and pressurized by the pressure boost pump 16, and is then poured into the gas absorption tank 8 in a shower form from the top of the gas absorption tank 8. supplied and efficiently absorbs the gaseous medium. The chemical heat storage material released from the pressurized bonogo 16 to the gas absorption tank 8 and the gas absorption tank 8
A heat exchanger 17 is provided to exchange the temperature of the chemical heat storage material that has absorbed the gas medium, so as to cool the chemical heat storage material that has absorbed the gas medium. In addition to the heat exchanger 17, a heat exchanger 17a for facilitating chemical heat storage addition may be provided in the pipe line for feeding the chemical M heat material to the gas absorption tank 8.

[Example 2] (Fig. 2) A second example of the method of the present invention will be explained using the equipment shown in Fig. 2. In this embodiment, the storage tank 10 for storing the chemical M heat material that has absorbed the gas medium in the first embodiment is omitted, the function of this storage tank is given to the gas absorption tank 8, and the chemical M heat material that has released the gas medium is omitted. The storage tank 15 for storing the heat storage material is omitted, and the gas release tank 12 has the function of the storage tank B. The rest is the same as the first embodiment described above, so a detailed explanation will be omitted. Note that, depending on the design, the heat exchanger [7] may be omitted in each embodiment.

What is chemical heat storage material? [Sunshine Journal Liao (+9)
1984 Vol.1. 5 No. 1.2, page 13 ~ 1
(page 9).

〔effect〕

As described above, according to the present invention, the following effects can be obtained.

(a) A medium liquefied by the cold heat of a low-temperature liquefied gas such as LNG, as shown by the Pillill line in Figure 3,
It can be stored in a liquid state at room temperature and high pressure, and taken out and used as needed, and the heat-saving energy that was conventionally thrown away can be stored as a liquid medium at room temperature and high pressure, as described above.

(bl Absorbed and gasified medium at load (yo,
Utilizing the properties of the chemical heat storage material, this gas medium is absorbed or adsorbed by the chemical heat storage material in the form of a liquid or body, and this is stored at room temperature and high pressure. It can be released from the gas and recycled as a gaseous medium.

(e) In the gas release tank, the pressure of the chemical heat storage material that has released the gas medium is increased by a pump, and the gas medium is returned to the gas absorption tank in a high-pressure state. This improves the absorption efficiency of the gas medium into the chemical heat storage material. The heat in the absorption tank is used for heat bonogo, etc.

[Brief explanation of drawings]

The figures show the equipment for carrying out the method of the present invention, Fig. 1 is a schematic system diagram, Fig. 2 is a schematic system diagram of an embodiment in which the storage tank in the embodiment of Fig. 1 is omitted, and Fig. 3 is a P1 curve diagram. . 1- Rearrange KA exchange W + 2-'・Norbarkkusk・3 Boosting pop, 4 Heat exchanger, 5 Storage tank, 61
1 Ge tension valve, 7 Cold heat recovery and utilization load, 8 Gas absorption tank. 9 Pop, 10 Chemical thermal storage key storage tank that absorbed gas medium, 11 Expansion valve, 12 Gas release +”ff
, 13 Gas i'rFh iP equipment, 14 Boosting pump, 15 Storage tank for chemical heat storage material with discharged gas medium, 16 Boosting bongo, 17.17a Heat exchanger. Patent applicant: Kawasaki 1R Industrial Co., Ltd.
Rito (Yoshi Sano)
jjli,',',',-;\,--Noni1-111z)...-'

Claims (1)

[Claims] [Claim 1] (a) When storing the cold energy of low-temperature liquefied gas such as LNG, (b) Using ammonia, propane, butane, etc. as a cold energy storage medium, and using the gases of these media to store the cold energy. The low-temperature liquefied gas is liquefied by the cold heat in an exchanger, and the pressure of this liquefied medium is increased by means such as a pump.Then, the temperature is raised in a heat exchanger using seawater etc. to obtain a liquid medium at room temperature and high pressure. c) Temporarily store this in a medium storage tank, (d) Later, take out the storage medium as appropriate and expand it to a low temperature and low pressure state with an expansion valve to supply cold heat to a frozen warehouse etc., (e) After that, the medium gasified by endothermic absorption is absorbed or adsorbed into a liquid chemical heat storage material in a gas absorption tank, and after being stored, the chemical heat storage material is heated under reduced pressure in a gas release tank. (f) Circulating this into the cold heat exchanger,
A method for storing cold energy, which is characterized in that the chemical heat storage material that has released gas is pressurized by a pump and then sent back to the gas absorption tank. [Claim 2] The method for storing cold energy according to Claim 1, wherein the chemical heat storage material is ammonia-based, carbon dioxide-based, water-based, or the like.