Air liquefaction device

Abstract

To provide an air liquefier which can produce liquid air from which solidified moisture and carbon dioxide are removed without allowing moisture and carbon dioxide in air to be solidified in a tube.SOLUTION: An air liquefier comprises: a cycle where liquid air of -190°C from which solidified moisture and carbon dioxide are removed with a heat-resistant filter (13) is supplied to the outside by a pump B (14); and a cycle where the liquid air of -190°C, from which the solidified moisture and carbon dioxide are removed with the heat-resistant filter (13), is pumped to a heat exchange tube B (11) of a heat exchanger A (9) by a pump C (15), air which becomes vaporized air of -120°C through heat exchange with a heat exchange tube A (10) is pumped to an expansion valve B (16), and the liquid air of -190°C liquefied at the expansion valve B (16) is sent back to a liquefaction layer.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an air liquefaction device that liquefies air by utilizing the cold heat of liquid air.

Background Art

[0002] Conventionally, as an air liquefier, there is known one that liquefies air by utilizing the cold heat of liquefied natural gas.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in an air liquefier that produces liquid air by utilizing the cold heat of liquefied natural gas, in a cycle where air from which moisture has been removed in an adsorption tower is cooled with liquefied natural gas, the air is sucked and compressed by a compressor, the heated and pressurized air is cooled with liquefied natural gas, the air is pumped to an expansion valve, and liquid air liquefied by the expansion valve is produced, moisture that could not be removed in the adsorption tower and carbon dioxide that was not removed solidify in the tubes of the air liquefier, blocking the air flow path and preventing air liquefaction.

[0005] Therefore, an object of the present invention is to solve the problems of the conventional air liquefier described above, and to provide an air liquefaction device capable of producing liquid air from which solidified moisture and carbon dioxide have been removed without the moisture and carbon dioxide in the air solidifying in the tubes.

Means for Solving the Problems

[0006] In order to achieve the above object, the invention according to claim 1 is an air liquefier that liquefies air using the cold heat of liquefied natural gas. At the bottom of a cold storage tank (4) into which ultra-low temperature liquid air is injected, a heating plate (5) that ejects bubbles generating heat energy by energizing electrical energy is joined. Air is sent into the heating plate (5) by a blower (6), and the bubbles ejected from the ejection holes of the heating plate (5) are raised to the vaporization layer and exchanged with the ultra-low temperature liquid air in the liquefaction layer to become ultra-low temperature air. The moisture and carbon dioxide in the bubbles are solidified and mixed with the liquid air in the liquefaction layer, and the ultra-low temperature air containing no moisture and carbon dioxide that has risen to the vaporization layer is inhaled and compressed by a compressor (8) to be heated and pressurized to become low-temperature air. The air is pumped into the heat exchange tube A (10) of the heat exchanger A (9), pumped to an expansion valve A (12) as ultra-low temperature air after heat exchange with the heat exchange tube B (11), and the ultra-low temperature liquid air liquefied by the expansion valve A (12) is sent into the liquefaction layer. The liquid air is passed through a heat-resistant filter (13) woven with heating wires to which solidified moisture and carbon dioxide adhere, and the liquid air from which the solidified moisture and carbon dioxide have been removed by the heat-resistant filter (13) is supplied to the outside by a pump B (14). A cycle, and a pump C (15) pumps the ultra-low temperature liquid air from which the solidified moisture and carbon dioxide have been removed by the heat-resistant filter (13) into the heat exchange tube B (11) of the heat exchanger A (9), and the air that has become ultra-low temperature vaporized air after heat exchange with the heat exchange tube A (10) is pumped to an expansion valve B (16), and the ultra-low temperature liquid air liquefied by the expansion valve B (16) is sent back to the liquefaction layer. It is characterized by having a cycle.

Effect of the Invention

[0007] The invention described in claim 1 can prevent moisture and carbon dioxide in the air from solidifying in the tubes of the air liquefaction device, and can produce liquid air from which the solidified moisture and carbon dioxide have been removed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0009] Hereinafter, an embodiment of the air liquefaction device of the present invention will be described in detail with reference to the drawings.

[0010] FIG. 1 is an explanatory diagram showing an air liquefaction device.

[0011] FIG. 2 is an explanatory diagram showing an example of a liquid air manufacturing machine.

[0012] The liquid air at -190°C produced by the liquid air manufacturing machine and injected into the liquid air recovery tank (1) as shown in FIG. 2 is passed through the on-off valve A (3) by the pump A (2) and sent into the cold insulation tank (4), and the on-off valve A (3) is closed.

[0013] By energizing the electrical energy joined to the bottom of the cold insulation tank (4), heat energy of 20°C is generated, and air is sent in by the blower (6) with the on-off valve B (7) opened to the heating plate (5) that ejects bubbles from extremely small pores.

[0014] The bubbles ejected from the ejection holes of the heating plate (5) rise to the vaporization layer and become air at -120°C through heat exchange with the liquid air at -190°C in the liquefaction layer. The moisture and carbon dioxide in the bubbles ejected from the ejection holes of the heating plate (5) solidify and mix with the liquid air in the liquefaction layer.

[0015] The air at -120°C that does not contain the moisture and carbon dioxide that have risen to the vaporization layer is sucked and compressed by the compressor (8), and the air at -50°C that has been heated and pressurized is pumped into the heat exchange tube A (10) of the heat exchanger A (9). Then, the air that has become -120°C through heat exchange with the heat exchange tube B (11) is pumped to the expansion valve A (12).

[0016] The -190°C liquid air liquefied by the expansion valve A (12) is sent into the liquefaction layer. The liquid air passes through a heat-resistant filter (13) in which a heating wire with solidified moisture and carbon dioxide adhering to it is woven, and the solidified moisture and carbon dioxide are removed by the heat-resistant filter (13).

[0017] The air liquefaction device of this embodiment includes a cycle in which the -190°C liquid air from which solidified moisture and carbon dioxide have been removed by the heat-resistant filter (13) is supplied externally by the pump B (14), and a cycle in which the -190°C liquid air from which solidified moisture and carbon dioxide have been removed by the heat-resistant filter (13) is pumped into the heat exchange tube B (11) of the heat exchanger A (9) by the pump C (15), and at the same time, the air that has become vaporized air at -120°C through heat exchange with the heat exchange tube A (10) is pumped to the expansion valve B (16), and the -190°C liquid air liquefied by the expansion valve B (16) is sent back to the liquefaction layer.

[0018] Also, for the solid moisture and carbon dioxide adhering to the heat-resistant filter (13), the on-off valve B (7) is closed, the on-off valve A (3) is opened, and the liquid air in the cold storage tank (4) is sent back to the liquid air recovery tank (1) by the reversely rotated pump A (2). Then, the on-off valve A (3) is closed, and the heating wire woven into the heat-resistant filter (13) is energized and heated to be liquefied and vaporized. The liquefied and vaporized moisture and carbon dioxide are discharged externally by the blower (6) with the on-off valve B (7) opened and rotated reversely.

[0019] It should be noted that the air liquefaction device according to the present invention is not limited to the above-described embodiments at all, and can be appropriately changed without departing from the spirit of the present invention. For example, the liquid air injected into the liquid air recovery tank is not limited to that produced by the liquid air manufacturing machine shown in FIG. 2, and may be produced by any manufacturing device and manufacturing method.

[0020] In addition, the liquid air used in the liquid air circulation power generation device disclosed in Japanese Patent No. 6684762 is expected to have a global demand, and the present invention has the manufacturing capacity to meet that demand. Further, instead of releasing carbon dioxide, which is the main cause of global warming and a greenhouse gas discharged from the air liquefaction device, into the atmosphere, the liquefied water and vaporized carbon dioxide are separated into a liquefaction layer and a vaporization layer in a storage tank, and the carbon dioxide in the vaporization layer is pressurized and liquefied by a compressor and permanently stored in a liquefied carbon dioxide tank, which also has the effect of reducing carbon dioxide in the atmosphere.

Explanation of Signs

[0021] 1... Liquid air recovery tank, 2... Pump A, 3... On-off valve A, 4... Cold storage tank, 5... Heating plate, 6... Blower, 7... On-off valve B, 8... Compressor, 9... Heat exchanger A, 10... Heat exchange tube A, 11... Heat exchange tube B, 12... Expansion valve A, 13... Heat-resistant filter, 14... Pump B, 15... Pump C, 16... Expansion valve B.

Claims

In a conventional air liquefier that produces liquid air using the cold heat of liquefied natural gas, air from which moisture has been removed in an adsorption tower is cooled with liquefied natural gas, the air is sucked and compressed by a compressor, the heated and pressurized air is cooled with liquefied natural gas, the air is pumped to an expansion valve, and in a cycle for producing liquid air liquefied by the expansion valve, in order to solve the problem that moisture that could not be removed in the adsorption tower and carbon dioxide that was not removed solidified in the tubes of the air liquefier, blocking the air flow path and preventing air liquefaction, in an air liquefier that liquefies air using the cold heat of liquid air, A heating plate (5) that ejects bubbles generating heat energy by energization of electrical energy is joined to the bottom of a cold storage tank (4) into which ultra-low temperature liquid air is injected, and air is sent into the heating plate (5) by a blower (6), The bubbles ejected from the ejection holes of the heating plate (5) are raised to a vaporization layer and heat-exchanged with the ultra-low temperature liquid air in the liquefaction layer to become ultra-low temperature air, and the moisture and carbon dioxide in the bubbles are solidified and mixed with the liquid air in the liquefaction layer, The ultra-low temperature air containing no moisture and carbon dioxide raised to the vaporization layer is sucked and compressed by a compressor (8) to be heated and pressurized to become low temperature air, and the air is pumped to the heat exchange tube A (10) of a heat exchanger A (9) and pumped to an expansion valve A (12) as air that has become ultra-low temperature by heat exchange with a heat exchange tube B (11), The ultra-low temperature liquid air liquefied by the expansion valve A (12) is sent into the liquefaction layer, and the liquid air is passed through a heat-resistant filter (13) in which a heating wire to which solidified moisture and carbon dioxide adhere is woven, and the liquid air from which the solidified moisture and carbon dioxide have been removed by the heat-resistant filter (13) is supplied to the outside by a pump B (14), and a cycle A cycle in which a pump C (15) pumps the ultra-low temperature liquid air from which solidified moisture and carbon dioxide have been removed by a heat-resistant filter (13) to the heat exchange tube B (11) of a heat exchanger A (9), the air that has become ultra-low temperature vaporized air by heat exchange with the heat exchange tube A (10) is pumped to an expansion valve B (16), and the ultra-low temperature liquid air liquefied by the expansion valve B (16) is sent back to the liquefaction layer, An air liquefaction device characterized by having the above.

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