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Method for transferring and filling liquefied gas

A technology for liquefied gas and supplementary gas, which is applied in container filling method, container discharge method, gas/liquid distribution and storage, etc., and can solve the problem of increasing the proportion of low-boiling components

Inactive Publication Date: 2003-03-19
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that when the low-boiling point liquefied gas or compressed gas is pressurized excessively, the proportion of low-boiling point components will increase

Method used

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  • Method for transferring and filling liquefied gas
  • Method for transferring and filling liquefied gas
  • Method for transferring and filling liquefied gas

Examples

Experimental program
Comparison scheme
Effect test

example 1 and comparative example 1

[0072] A 2.25 liter container (hereinafter referred to as the first container) is filled with 2 kg of difluoromethane (HFC32), pentafluoroethane (HFC125) and 1,1,1,2 in a weight ratio of 23 / 25 / 52 - Tetrafluoroethane (HFC134a) zeotrope, while a one liter booster tank was filled with 800 grams of HFC32, HFC125 and HFC134a zeotrope in a weight ratio of 23 / 25 / 52. To increase the steam pressure, the steam side of the first vessel is connected by a pipe to the steam side of the pressurization tank, and a flow meter is provided for flow measurement. While heating the booster tank at 30°C in the constant temperature tank, the first container is pressurized by 0.08Mpa (MPa) from its vapor side with a pressure regulating valve, and at the same time, the zeotropic mixture is pumped at a rate of 0.08Mpa per minute by a pump. A flow of 12 grams was transferred from the liquid side of the first container and filled into another empty container. Transfer-Filling work is carried out at room ...

example 2 and comparative example 2

[0079] Using a mixture of HFC32, HFC125 and HFC134a in a weight ratio of 23 / 25 / 52 as a zeotrope and a mixture of HFC32 and HFC125 in a weight ratio of 50 / 50 as pressurization gas, the pressure in the first vessel was increased by an additional 0.06 Mpa and tested in the same manner as Example 1. The pressurized gas has a sufficiently high pressure, as shown below, so heating in a constant temperature bath is omitted. The flow rate of pressurized gas is approximately 10.5 cubic centimeters per minute.

[0080] In Comparative Example 2, transfer-filling was performed in the same manner while the pipe on the vapor side of the first container was closed.

[0081] The transmission-fill percentage and the results of the compositional analysis of the gas samples taken are shown in Table 2. The vapor pressure of HFC32 / HFC125 / HFC134a (23 / 25 / 52 weight ratio) at 25°C is 1.21Mpa, while the vapor pressure of HFC32 / HFC125 (50 / 50 weight percent) at 25°C is 1.66Mpa.

[0082] ...

example 2

[0083] Composition (percentage by weight) transmission filling Example 2 Comparative example 2 filling percentage HFC3 HFC12 HFC134 HFC32 HFC125

[0084] 2 5 a HFC134a 0 23.0 25.0 52.0 23.0 25.0 52.0 10 23.0 25.0 52.0 23.0 25.0 52.0 20 23.0 25.0 52.0 22.9 24.9 52.2 30 23.0 25.0 52.0 22.8 24.9 52.3 40 23.0 25.0 52.0 22.7 24.8 52.5 50 23.0 25.0 52.0 22.6 24.8 52.6 60 23.0 25.0 52.0 22.5 24.7 52.8 70 23.0 25.0 52.0 22.4 24.6 53.0 80 23.0 25.0 52.0 22.2 24.4 53.4 90 22.9 24.9 52.2 21.7 24.0 54.3

[0085] From the data compiled in Tables 1 and 2 it is evident that the variation in composition can be greatly reduced to 1 / 12 to 2 / 12 by boosting from the steam side compared to the case without boosting.

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Abstract

The present invention provides a method for transfer-filling a liquefied gas by drawing out a nonazeotropic mixture stored in a first container and containing at least two liquefied gases differing in boiling point as essential components from a liquid phase thereof and transfer-filling the mixture into a second container, characterized in that the method comprises filling the following supplement liquid (A) or supplement gas (B) into said first container in an amount making up for a portion of the capacity of said first container that is equal to the decrease in volume of the liquid phase of said nonazeotropic mixture resulting from transfer-filling: (A) a supplement liquid which is the liquid phase of a liquefied gas mixture having the same composition as that of the nonazeotropic mixture stored in the first container; (B) a supplement gas which is (i) (a) a gaseous phase of a liquefied gas mixture having the same composition as that of the nonazeotropic mixture stored in the first container or (b) a gaseous phase composed of at least one of component of said nonazeotropic mixture and containing the component having the lowest boiling point of all the components of said mixture in a proportion larger than the proportion thereof in said nonazeotropic mixture, or (ii) a compressed gas. The method of the invention drastically reduces the change, resulting from transfer-filling, in the composition of a nonazeotropic refrigerant mixture which is used as a working fluid in the vapor compression type refrigerating cycle.

Description

technical field [0001] The present invention relates to a conveying-filling method of a mixed substance used as a working fluid of a vapor compression refrigeration cycle, especially a conveying-filling method of a non-azeotropic liquefied gas mixture comprising at least two liquefied gases with different boiling points as main components. Background technique [0002] Among them, a vapor compression refrigeration cycle in which a fluid is cooled and heated by utilizing changes in the state of matter, that is, evaporation and condensation, is widely used in heating and cooling equipment, refrigerators, hot water supply systems, and other equipment. For such a vapor compression refrigeration cycle, various working fluids including fluorocarbon refrigerants have been developed and put into use. Among them, HCFC22 (chlorodifluoromethane) is widely used in heating and cooling equipment of air conditioning systems. [0003] In recent years, however, it has been recognized that t...

Claims

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Application Information

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IPC IPC(8): F17C5/02F17C7/02
CPCF17C5/02F17C7/02
Inventor 井本匡美井出哲柴沼俊
Owner DAIKIN IND LTD