JP2000304369A - Device for eliminating water of direct-expansion-type evaporator in absorption-type refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the water-eliminating device of a direct-expansion-type evaporator by an absorption-type refrigerating device for eliminating water that remains in a heat transfer pipe in an evaporator. SOLUTION: A gas/liquid separator 31 is provided halfway in a first refrigerant vapor transfer pipe 11 for transferring refrigerant vapor being evaporated in a heat transfer pipe 1a of a direct-expansion-type evaporator 1 to an absorber 2, water contained in the evaporation vapor is separated, water staying in the gas/liquid separator 31 is sucked by an ejector 31 that is driven by absorption liquid being transferred from the absorber 2 to a reproduction part 3, and at the same time the sucked water is guided into the first refrigerant vapor transfer pipe 11 for returning to the side of the absorber 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water removal device for a direct expansion type evaporator in an absorption refrigeration system.

[0002]

2. Description of the Related Art An evaporator used in an absorption refrigeration unit, for example, a unit cooler in a refrigeration warehouse, is of a direct expansion type in which a refrigerant liquid is decompressed by an expansion valve, guided into an evaporator and evaporated. Is used. As shown in FIG. 2, the refrigerant in a container body 52 of the direct expansion type evaporator 51 is supplied from a refrigerating drive unit 53 including an absorber, a regenerator, a condenser, etc., via a refrigerant liquid transfer pipe 54. A heat transfer tube 55 for guiding the liquid and exchanging heat with the fluid to be cooled to cool the fluid to be cooled is arranged, and the heat transfer tube 55 in the direct expansion type evaporator 51 extends vertically. Thus, a plurality of horizontal portions are formed in a meandering shape connected to each other by arc portions.

[0003]

However, since the refrigerant liquid, for example, the ammonia liquid supplied to the evaporator 51 contains water, the ammonia liquid evaporates first and the water is inevitably removed from the horizontal portion of the heat transfer tube 55. Remains in the evaporator 5
1 has a problem that the cooling efficiency is reduced.

Accordingly, an object of the present invention is to provide a water removal device for a direct expansion type evaporator in an absorption refrigerating device capable of removing moisture remaining in a heat transfer tube in the evaporator.

[0005]

In order to solve the above-mentioned problems, a water removal device for a direct expansion type evaporator in an absorption refrigeration system according to the present invention is provided in a heat transfer tube of the direct expansion type evaporator in an absorption refrigeration system. A gas-liquid separator is provided in the middle of a refrigerant vapor transfer pipe for transferring the refrigerant vapor evaporated in the absorber to the absorber, and the absorption liquid in the absorber is transferred to the regenerating section by a liquid transfer pump. The refrigerant vapor transfer pipe that transfers the refrigerant vapor separated by the gas-liquid separator to the absorber is connected to the refrigerant vapor transfer pipe by a refrigerant liquid extraction pipe, and an ejector is provided in the refrigerant liquid extraction pipe. In addition, the suction part of the ejector and the liquid extraction part of the gas-liquid separator are connected by a liquid suction pipe, and in the water removing device, the lowermost horizontal heat transfer pipe provided in the evaporator is provided. Than one end of the liquid suction pipe connected to the As the other end of the liquid separator side is positioned below, it is obtained by tilting the liquid suction tube.

According to the above construction, the gas-liquid separator is provided in the middle of the refrigerant vapor transfer pipe for transferring the refrigerant vapor containing moisture generated in the heat transfer pipe of the evaporator to the absorber. Moisture remaining in the bottom of the evaporator is sucked into the refrigerant liquid extraction pipe by the ejector via the liquid suction pipe and guided into the refrigerant vapor transfer pipe, so that water remains in the heat transfer pipe of the evaporator. Can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a moisture removal device for a direct expansion type evaporator in an absorption refrigeration system according to an embodiment of the present invention will be described with reference to FIG. The absorption refrigeration apparatus according to the present embodiment is used, for example, as a unit-type large cooler in a freezing warehouse, a food freezer, and the like.

First, a schematic configuration of the absorption refrigeration apparatus will be described. This absorption refrigerating apparatus has a heat transfer tube 1a for guiding a refrigerant liquid (for example, an ammonia liquid), evaporates the refrigerant liquid in the heat transfer tube 1a, and uses a latent heat of the evaporation to cool the fluid (for example, air, gas, etc.). Evaporator 1 for cooling water and refrigerant vapor (e.g., ammonia vapor) evaporated by evaporator 1 for absorbing liquid (e.g., aqueous ammonia solution)
, Heat regenerator 3a and distillation column 3
b, a regenerating unit 3 for guiding and heating and regenerating the absorbing liquid having absorbed the refrigerant vapor in the absorber 2, a condenser 4 for condensing the refrigerant vapor regenerated in the regenerating unit 3, and an evaporator 1. A first refrigerant vapor transfer pipe 11 for transferring refrigerant vapor in the heat transfer tube 1a to the absorber 2, and a liquid transfer pump (also referred to as a solution pump) 12 on the way, and absorption of the refrigerant vapor absorbed by the absorber 2. An absorbent transfer pipe 13 for transferring the liquid to the regenerating section 3; a second refrigerant vapor transfer pipe 14 for transferring the refrigerant vapor from the distillation column 3b of the regenerating section 3 to the condenser 4; A high-pressure liquid receiving tank 16 for guiding and temporarily storing the refrigerant liquid through a refrigerant liquid outlet pipe 15 and a liquid transfer pump (also a reflux pump) 17 and an expansion valve 18 in the middle of the high-pressure liquid receiving tank. The refrigerant liquid stored in the evaporator 1
And a reflux pipe for returning a part of the refrigerant liquid from the high-pressure liquid receiving tank 16 to the distillation column 3b of the regenerating unit 3. 20, provided between the first refrigerant vapor transfer pipe 11 and the refrigerant liquid transfer pipe 19, in order to improve the thermal efficiency by giving the heat of the refrigerant liquid from the condenser 4 to the refrigerant vapor from the evaporator 1. Subcooler 21 is provided.

The absorption refrigeration system is provided with a water removal device 22 for removing water remaining in the heat transfer tube 1a of the evaporator 1. That is, the water removing device 22 is provided with the gas-liquid separator 3 provided in the middle of the first refrigerant vapor transfer pipe 11 at a position upstream of the subcooler 21.
And one end of the first refrigerant vapor connected between the gas-liquid separator 31 and the supercooler 21 at one end connected to the absorption liquid transfer pipe 13 at a position downstream of the liquid transfer pump 12. A refrigerant liquid extraction pipe 32 connected in the middle of the transfer pipe 11, an ejector 33 provided in the refrigerant liquid extraction pipe 32,
A liquid suction pipe 3 that connects a liquid outlet (liquid outlet) of the gas-liquid separator 31 and a suction port (suction unit) of the ejector 33.
4, a first on-off valve 35 provided at a position upstream of the ejector 33 of the refrigerant liquid extraction pipe 32, and the liquid suction pipe 3
4 comprises a second on-off valve 36 provided on the way and a controller 37 for controlling both on-off valves 35, 36. The controller 37 has, for example, a function of having a timer to open and close the on-off valves 35 and 36 at predetermined time intervals.

[0010] Further, the tip of the first vaporizer side refrigerant vapor transfer pipe 11a between the evaporator 1 and the gas-liquid separator 31 is:
This first evaporator-side refrigerant vapor is opened to the upper part in the gas-liquid separator 31 and connected to the outlet side of the lowermost horizontal part of the heat transfer tube 1a provided to meander vertically. It is inclined so as to be lower than the base end of the transfer pipe 11a. The first absorber-side refrigerant vapor transfer pipe 11b extending from the gas-liquid separator 31 to the absorber 2 is connected to the upper part of the gas-liquid separator 31.

Accordingly, the (vapor-rich) refrigerant vapor containing water generated in the heat transfer tube 1a of the evaporator 1 enters the gas-liquid separator 31, where the water is stored. On the other hand, the refrigerant vapor flows from the upper part thereof to the first absorber-side refrigerant vapor transfer pipe 11.
b and is transferred to the absorber 2. Further, the first refrigerant vapor transfer pipe 11 downstream of the refrigerant liquid introduction point by the refrigerant liquid extraction pipe 32 is inclined so that the absorber 2 side is lowered so that moisture naturally flows to the absorber 2. .

In the above configuration, during normal operation, the first and second on-off valves 35 and 36 are closed and the refrigerant liquid extraction pipe 3 is closed.
The refrigerant refrigeration cycle is operated while preventing the refrigerant liquid from flowing to the second refrigeration cycle. That is, in this operation, the moisture-rich refrigerant vapor generated in the heat transfer tube 1a of the evaporator 1 enters the gas-liquid separator 31, where the water is stored at the bottom and the refrigerant vapor is removed by the first absorption. Refrigerant vapor transfer pipe 1
Via 1b, it is transferred to the absorber 2.

By the way, the water accumulated at the bottom of the gas-liquid separator 31 is discharged from the first and second on-off valves 35 and 36 at predetermined time intervals by a timer provided in the controller 37.
Is opened and transferred to the absorber by the suction action of the ejector 33. That is, the refrigerant liquid flowing in the absorption liquid transfer pipe 13 is supplied to the refrigerant liquid extraction pipe 32 by the driving force of the liquid transfer pump 12 to drive the ejector 33 and accumulate at the bottom of the gas-liquid separator 31. The water is absorbed in the liquid suction pipe 34
After being drawn into the refrigerant liquid extraction pipe 32 side, it is guided into the first refrigerant vapor transfer pipe 11, more precisely, into the first absorber-side refrigerant vapor transfer pipe 11 b, and finally, into the absorber 2. Is returned to.

As described above, the gas-liquid separator 31 is provided in the middle of the first refrigerant vapor transfer pipe 11 for transmitting the refrigerant vapor containing moisture generated in the heat transfer pipe 1a of the evaporator 1 to the absorber 2. The water collected at the bottom in the gas-liquid separator 31 is discharged to the refrigerant liquid extraction pipe 32 side by the ejector 33 via the liquid suction pipe 34, and the first refrigerant vapor transfer pipe 1
1, the heat transfer tube 1a of the evaporator 1
It is possible to prevent moisture from remaining in the inside, and thus to prevent the cooling efficiency in the evaporator 1 from decreasing.

In the above embodiment, the first and second timers are provided by a timer provided in the controller 37.
Although the on-off valves 35 and 36 have been described to be opened at predetermined time intervals, as shown by the phantom line in FIG. The detection signal is input to the controller 37, and when a predetermined amount of water has accumulated, the first and second on-off valves 35 and 36 are automatically (in some cases manually operated) via the controller 37. Good) open.

[0016]

As described above, according to the structure of the present invention, the gas-liquid separator is provided in the middle of the refrigerant vapor transfer pipe for transferring the refrigerant vapor containing moisture generated in the heat transfer pipe of the evaporator to the absorber. At the same time, the water collected at the bottom of the gas-liquid separator is discharged to the refrigerant liquid extraction pipe side by the ejector via the liquid suction pipe, and is guided to the refrigerant vapor transfer pipe. It is possible to prevent moisture from remaining in the heat transfer tube, and thus prevent a decrease in cooling efficiency in the evaporator.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic overall configuration of an absorption refrigeration apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a schematic configuration of an evaporator in a conventional absorption refrigeration apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator 1a Heat transfer tube 2 Absorber 3 Regeneration part 4 Condenser 11 First refrigerant vapor transfer tube 19 Refrigerant liquid transfer tube 22 Water removal device 31 Gas-liquid separator 32 Refrigerant liquid extraction tube 33 Ejector 34 Liquid extraction tube 35 First On-off valve 36 Second on-off valve 37 Controller

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Hisamori 1-7-89 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Hironao Tanaka 1 Minami-Kohoku, Suminoe-ku, Osaka-shi, Osaka No.7-89 F-term in Hitachi Zosen Corporation (Reference) 3L093 AA02 BB01 BB37 DD08 HH02 JJ04 KK05 LL05 MM02

Claims (2)

[Claims] 1. A gas-liquid separator is provided in a refrigerant vapor transfer pipe for transferring refrigerant vapor evaporated in a heat transfer pipe of a direct expansion type evaporator to an absorber in an absorption refrigeration apparatus. A part of the refrigerant liquid transfer pipe that transfers the liquid to the regenerating unit by the liquid transfer pump and a part of the refrigerant vapor transfer pipe that transfers the refrigerant vapor separated by the gas-liquid separator to the absorber are connected to the refrigerant liquid. An absorption pipe connected with an extraction pipe, an ejector is provided in the middle of the refrigerant liquid extraction pipe, and a suction section of the ejector and a liquid extraction section of the gas-liquid separator are connected by a liquid suction pipe. Moisture removal device for direct expansion type evaporator in refrigeration system. 2. The liquid so that the other end on the gas-liquid separator side is located lower than one end of a liquid suction pipe connected to the lowermost horizontal portion of the heat transfer tube provided in the evaporator. The water removal device for a direct expansion type evaporator in an absorption refrigeration system according to claim 1, wherein the suction pipe is provided at an angle.