JPH06294497A - Carburetor - Google Patents

Abstract

PURPOSE:To continuously use a carburetor and easily defrost heat exchangers in winter and at a cold district by feeding a low-temperature liquid to one side of two heat exchangers connected in parallel to obtain hot gas, and feeding it to the other heat exchangers for defrosting. CONSTITUTION:A carburetor feeds the low-temperature liquid 2 stored in a tank 1 to air-heated heat exchangers 6, 7, 8, 9 for the heat exchange with the atmospheric air to vaporize it. Two heat exchangers 6, 8 and 7, 9 are connected in parallel, valves 4, 5, 14, 15, 17, 18 are provided as passage switching means to feed the low-temperature liquid 2 to one side of the heat exchangers 6, 8 and 7, 9, and hot-gas passages 11, 12, 13, 16 are provided to feed the low- temperature liquid 2 converted into hot gas through the heat exchangers on one side to the heat exchangers on the other side for defrosting. The low- temperature liquid 2 is heat-exchanged with the atmospheric air by the heat exchangers on one side and vaporized into hot gas, and it is fed to the heat exchangers on the other side to defrost them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporizer for causing a low temperature liquid stored in a tank to flow through an air heat type heat exchanger to exchange heat with the atmosphere and vaporize.

[0002]

_2. Description of the Related Art Low temperature liquids such as LNG (liquefied natural gas), LN ₂ (liquid nitrogen) and LO ₂ (liquid oxygen) are stored in a tank, and when used, the stored low temperature liquid is vaporized. After being vaporized in a container, it is supplied to users.

An air-heat type heat exchanger (hereinafter referred to as a heat exchanger) is used as a vaporizer, and is composed of a tube through which a low-temperature liquid passes and fins provided outside the tube for exchanging heat with the atmosphere. Configured (none shown). When the low temperature liquid passes through the inside of this tube, the low temperature liquid is vaporized at the air temperature (atmospheric temperature).

When the heat exchanger is continuously used to vaporize the low-temperature liquid, frost adheres to the tubes and fins of the heat exchanger, and the vaporization ability is exponentially reduced, making the heat exchanger unusable.

Therefore, as shown in FIG. 2, two heat exchangers are used by switching them with valves.

FIG. 2 is an explanatory view for explaining a conventional vaporizer.

In the figure, 1 is a cooled low temperature liquid 2
Is a tank for storing the gas and is connected to two valves 4 and 5 via a branch tube 3. The valve (upper side of the figure) 4 is connected to the inlet of the air-heat type heat exchanger (hereinafter referred to as heat exchanger) 6 via a tube, and the valve (lower side of the figure) 5 is connected to the inlet of the heat exchanger 7. It is connected via a tube. The outlets of both heat exchangers 6 and 7 are further connected to the inlets of heat exchangers 8 and 9, and the outlets of both heat exchangers 8 and 9 are connected to merging tube 10. Therefore, only one of the valves, for example, the valve 4 is opened to form the flow path of the low temperature liquid as shown by the solid arrow, and when frost is adhered to the heat exchangers 6 and 8, the valve 4 is closed and the heat exchanger 6 is closed. , 8 is naturally defrosted, the other valve 5 is opened to form a flow path of the low temperature liquid as shown by the broken line arrow, and the heat exchangers 7 and 9 are used to vaporize the low temperature liquid 2. .

[0008]

However, when the vaporizer described above is used in winter or in cold regions, frost adheres to one heat exchanger in about 4 hours and falls below the rated capacity, so continuous use is possible. In that case, the valve must be changed, but the other heat exchanger also becomes frosted in about 4 hours and falls below the rated capacity. Therefore 1-2 to defrost frost naturally
It takes days and it is inefficient to wait during that time. Also, in order to realize a vaporizer that can be continuously used, six sets of heat exchangers are connected in parallel, one valve is opened one by one every 4 hours, and other valves are closed to allow natural defrosting of the heat exchanger. This must be done, and the device becomes large.

Therefore, an object of the present invention is to solve the above problems and to provide a carburetor which can be continuously used even in the winter and cold regions.

[0010]

In order to achieve the above object, the present invention provides a vaporizer in which a low temperature liquid stored in a tank is passed through an air temperature type heat exchanger to exchange heat with the atmosphere and vaporize. Two heat exchangers were connected in parallel, and one of these heat exchangers was provided with a flow path switching means for flowing a low-temperature liquid, and further, a heat gas was passed through one of the heat exchangers. A hot gas flow path for defrosting the low temperature gas by flowing it through the other heat exchanger is provided.

[0011]

According to the above construction, the low temperature liquid is caused to flow into one of the two heat exchangers to exchange heat with the atmosphere to be vaporized into hot gas, and the hot gas of the low temperature liquid is passed to the other heat exchanger. By flowing, the other heat exchanger can be defrosted.

[0012]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory view for explaining the vaporizer of the present invention. The same members as those shown in FIG. 2 are designated by the same reference numerals.

In the figure, reference numeral 1 is a tank for storing a low temperature liquid 2, which is connected to two valves 4 and 5 through a branch tube 3. The valve 4 is connected to the inlet of the heat exchanger 6 via a branch tube 11, and the valve 5 is connected to the inlet of the heat exchanger 7 via a branch tube 12. The outlet of the heat exchanger 6 is connected to the inlet of the heat exchanger 8 via a tube, and the outlet of the heat exchanger 7 is connected to the inlet of the heat exchanger 9 via a tube.

The outlet of the heat exchanger 8 is connected to the valves 14 and 15 via the branch tube 13, and the outlet of the heat exchanger 9 is connected to the valves 17 and 18 via the branch tube 16. The valve 15 is connected to the branch tube 12, and the valve 17 is connected to the branch tube 11. The valves 14 and 18 are connected to a merging tube 19.

The branch tube 13 and the branch tube 1
2, the branch tube 11 and the branch tube 16 respectively form a hot gas flow path. Valves 4, 5, 1
4, 15, 17, and 18 form a flow path switching unit.

Next, the operation of the embodiment will be described.

First, when the operator opens the valves 4, 15, 18 (fully open) and closes the valves 5, 14, 17 (fully closed), the cryogenic liquid flows from the tank 1 in the direction of the solid arrow. That is, the cryogenic liquid 2 flows through the branch tube 3, the valve 4 and the branch tube 11 in the heat exchangers 6 and 8 and is vaporized, and the liquid gas passes through the branch tube 13, the valve 15 and the branch tube 12 to exchange heat. Bowl 7, 9
After passing through the inside, it is supplied to the user or the like from the branch tube 16, the valve 18, and the confluent tube 19.

Frost adheres to the tubes and fins of the heat exchangers 6 and 8 because they exchange heat with the atmosphere, but after a predetermined time (for example, the rated operation time) has passed, the operator operates the valves 4 and 1.
When the valves 5, 14, 17 are opened and the valves 5, 14, 17 are closed, the hot gas flow paths are switched, and the low temperature liquid flows from the tank 1 in the direction of the broken line arrow. That is, the low temperature liquid 2 passes through the branch tube 3, the valve 5 and the branch tube 12 to pass through the heat exchangers 7 and 9 to be vaporized, and the vaporized low temperature gas passes through the branch tube 16, the valve 17 and the branch tube 11. Flow through the heat exchangers 6, 8. At the same time, the vaporized gas applies heat from the inside to the heat exchangers 6 and 8, so that the heat exchangers 6 and 8 are defrosted. The vaporized low temperature gas is supplied to the user or the like through the branch tube 13, the valve 14 and the confluent tube 19.

The operator operates the valve 4,
By operating 5, 14, 15, 17, 18 to switch the hot gas flow path, it is possible to continuously use the carburetor without installing a new heat source or adding a heat exchanger even in winter or cold regions. Become.

As described above, in this embodiment, the low temperature liquid is
One of the two heat exchangers is supplied with a cryogenic liquid and exchanges heat with the atmosphere to be vaporized into hot gas.The hot gas of the cryogenic liquid is passed through the other heat exchanger to remove the other heat exchanger. You can frost, provide a new heat source,
It is possible to realize a carburetor that can be continuously used even in the winter and cold regions without adding a heat exchanger.

In this embodiment, the operator switches each valve, but the present invention is not limited to this. An electromagnetic valve is used for the valve to automatically control the hot gas flow path by a microcomputer or a timer. It may be configured to be switched selectively. In this case, valve switching work is unnecessary. Further, in the present embodiment, the case where the number of heat exchangers is 2 in 2 rows and 4 in total is explained, but the present invention is not limited to this.
One may be provided in each row, or three or more may be provided. Further, in the present embodiment, the case where the valve is fully opened or fully closed has been described, but the present invention is not limited to this, and the valve opening may be changed according to the capacity of the heat exchanger, the flow rate of the liquid gas, or the like. May be.

[0023]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) The vaporizer can be continuously used even in winter or cold regions.

(2) The heat exchanger can be defrosted without using a new heat source or adding a heat exchanger.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining a vaporizer of the present invention.

FIG. 2 is an explanatory diagram for explaining a conventional vaporizer.

[Explanation of symbols]

2 Low-temperature liquid 4, 5, 14, 15, 17, 18 Flow path switching means (valve) 6, 7, 8, 9 (air temperature type) heat exchanger 11, 12, 13, 16 Hot gas flow path (branch tube) )

Claims (1)

[Claims] 1. A vaporizer in which a low temperature liquid stored in a tank is passed through an air-heat type heat exchanger to exchange heat with the atmosphere to vaporize, and two heat exchangers are connected in parallel and the heat of these heat exchangers is connected. A flow path switching means for flowing a low-temperature liquid is provided in either one of the exchangers, and the low-temperature gas that has been made into hot gas through one of the heat exchangers is flowed to the other heat exchanger to perform defrosting. A vaporizer characterized in that a hot gas flow path is provided for the vaporizer.