JP2002277102A - High temperature regenerator of absorption refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the height of a high temperature regenerator having an exhaust heat recovery unit in absorption refrigerating machine. SOLUTION: An exhaust heat recovery unit (13) comprising an orthogonal flow type heat exchanger is disposed between the exhaust opening (19) of a flue (18) and a smoke chamber (15). A blower (14) is disposed above the exhaust heat recovery unit (13). A duct (17) for introducing preheated air from the exhaust heat recovery unit (13) to a burner (12) is disposed beneath the body section (11).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-temperature regenerator for an absorption refrigerator.

[0002]

2. Description of the Related Art Hitherto, as a technique for improving the COP of an absorption refrigerator, it has been known to increase the efficiency of a high-temperature regenerator by utilizing exhaust gas from a high-temperature regenerator. Conventionally, an exhaust heat recovery device is provided in a high-temperature regenerator, and the exhaust gas and the supplied air are heat-exchanged by the exhaust heat recovery device, and the exhaust heat is recovered until the exhaust gas temperature decreases to about 120 ° C.

As shown in FIG. 5, conventionally, in order to improve the efficiency of heat exchange between exhaust gas (solid arrow in the figure) and supply air (dashed arrow in the figure), an exhaust heat recovery unit (13a) is used. ) Was constituted by a counter-flow type heat exchanger. Specifically, the exhaust heat recovery unit (13a) is provided above the smoke chamber (15) directly connected to the exhaust port (19) of the furnace tube (18), and has a flow path for exhaust gas and a flow path for supply air. Were both formed to extend in the vertical direction.

[0004]

FIG. 6 (b)
As shown in FIG. 6, by providing the exhaust heat recovery unit (13a), the high-temperature regenerator (1a), and thus the absorption refrigerator,
The height is increased by ΔL as compared with the one without the exhaust heat recovery unit (13a) as shown in FIG. In the figure, (12) is a burner, (14) is a blower, (17a) is a duct, (31) is a header,
(30) is an operation panel. As described above, the exhaust heat recovery unit (13
The heat exchange channel of a) extends in the vertical direction. Therefore, when trying to lengthen the heat exchange channel to improve the heat exchange efficiency, the height of the exhaust heat recovery unit (13a) must be further increased, and the high temperature regenerator (1a) is significantly It gets bigger.

[0005] On the other hand, under the background of the demand for de-fluorocarbons, it is desired to further improve the COP of the absorption chiller in order to recover the exhaust heat of the high-temperature regenerator more than ever. Need to be done. For example, if the exhaust heat can be recovered until the exhaust gas temperature decreases to about 70 ° C. to 80 ° C., further improvement of the COP can be expected. However, as described above, the conventional exhaust heat recovery device (13a)
If the exhaust gas temperature is reduced to about 70 ° C. to 80 ° C., the height of the exhaust heat recovery device becomes extremely high. For this reason, even if the efficiency of the high-temperature regenerator can be improved, the high-temperature regenerator becomes considerably larger than before. Therefore, it has been difficult for the conventional high-temperature regenerator to simultaneously achieve high efficiency and compactness.

[0006] Under such circumstances, a high-temperature regenerator capable of recovering exhaust heat more than before without increasing the height is keenly desired. The present invention aims to provide such a high temperature regenerator.

[0007]

In order to achieve the above object, according to the present invention, an exhaust heat recovery device is provided between an exhaust port of a furnace tube and a smoke chamber.

More specifically, the high-temperature regenerator of the absorption refrigerator according to the present invention comprises an exhaust heat recovery unit (13) for exchanging heat between the exhaust gas from the burner (12) and the air supplied to the burner (12). A high temperature regenerator provided with a furnace tube (18) provided with the burner (12)
And a smoke chamber provided outside the exhaust port (19) of the furnace tube (18).
(15), wherein the exhaust heat recovery unit (13) is provided between the exhaust port (19) of the furnace tube (18) and the smoke chamber (15). .

As described above, since the exhaust heat recovery device is not provided above the smoke chamber, the height of the high-temperature regenerator can be kept relatively low even when the size of the exhaust heat recovery device is increased.

The exhaust heat recovery unit (13) is preferably constituted by a cross-flow heat exchanger having an exhaust gas passage extending in the horizontal direction and an air supply passage extending in the vertical direction.

Thus, the heat transfer area can be increased by increasing the length in the horizontal direction without increasing the length in the vertical direction of the exhaust heat recovery device. Therefore, it is easy to increase the amount of exhaust heat recovery while keeping the height of the exhaust heat recovery unit low.

It is preferable that a blower (14) for supplying supply air is disposed above the exhaust heat recovery unit (13).

As described above, by providing the exhaust heat recovery device between the furnace tube and the smoke chamber, an empty space is created above the exhaust heat recovery device. According to the above, the blower is arranged in this empty space, and the effective use of the empty space is achieved. Further, since it is not necessary to provide the blower in the axial direction (lateral direction) of the furnace tube, the overall length of the high-temperature regenerator is reduced by the length of the blower, and the compactness is promoted.

In the lower part of the furnace tube (18), the exhaust heat recovery unit (1)
Duct for guiding preheated air from 3) to the above burner (12)
(17) is preferably provided.

By arranging the duct in the lower part of the furnace tube, the air preheated by the exhaust heat recovery unit reaches the burner in the shortest distance. Therefore, the pressure loss of the supply air is reduced. As a result, the capacity of the blower can be reduced more than before, and the size can be reduced.

[0016]

As described above, according to the present invention, since the exhaust heat recovery unit is provided between the exhaust port of the furnace tube and the smoke chamber, the height of the exhaust heat recovery unit is reduced while the exhaust heat recovery unit is kept low. It is possible to increase the amount of heat recovery. Therefore, the efficiency of the high-temperature regenerator can be improved while keeping its height low.

By constituting the exhaust heat recovery device with a cross-flow heat exchanger, it becomes easy to increase the amount of exhaust heat recovery while keeping the height low.

If the blower for supplying the supply air is provided above the exhaust heat recovery unit, it is not necessary to provide the blower on the side of the furnace tube or the smoke chamber, so that the horizontal length of the high-temperature regenerator is reduced. can do.

If the duct for guiding the preheated air to the burner is provided at the lower part of the furnace tube, the preheated air can be supplied to the burner at the shortest distance, so that the pressure loss of the preheated air can be reduced. In addition, the size of the blower can be reduced.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a high-temperature regenerator (1) according to the present embodiment.
Is shown. FIG. 2 is a refrigerant circuit diagram of the absorption refrigerator according to the present embodiment. The absorption refrigerator according to the present embodiment is obtained by replacing the high temperature regenerator (1a) with the high temperature regenerator (1) in FIG. 1 in the conventional absorption refrigerator shown in FIG. 6 (b). In FIG. 2, (2) is a condenser, (3) is an evaporator,
(4) is an absorber, (5) is a low-temperature regenerator, (6) is a low-temperature heat exchanger,
(7) is a high-temperature heat exchanger. Since the configuration of the refrigerant circuit itself is well known in the art, description thereof will be omitted. Condenser
(2), the evaporator (3), the absorber (4), and the low-temperature regenerator (5) are housed in the body (8) (see FIG. 6B).

As shown in FIG. 1, a furnace tube (18) extending in the horizontal direction is provided inside the main body (11) of the high temperature regenerator (1). At one end of the furnace tube (18) is a burner as a heating source.
(12) is attached. At the other end of the furnace tube (18), an exhaust port (19) for discharging exhaust gas (combustion gas) from the burner (12) is formed. Outside the exhaust port (19), the exhaust heat recovery device (13)
Is installed.

The exhaust heat recovery unit (13) is constituted by a so-called cross-flow type heat exchanger in which an exhaust gas passage and an air passage are orthogonal. Each flow path is provided with a corrugated heat transfer fin for promoting heat transfer. A smoke chamber (15) is provided outside the exhaust heat recovery device (13). With such a configuration, the furnace tube (18), the exhaust heat recovery device (13), and the smoke chamber (15)
They are arranged in a straight line in the axial direction of 8). In addition, smoke room (15)
Is for guiding the exhaust gas flowing out of the exhaust gas passage of the exhaust heat recovery unit (13) in the horizontal direction vertically upward. A chimney (16) is provided above the smoke chamber (15). Note that solid arrows in the drawing indicate exhaust gas, and broken arrows indicate supply air.

At the top of the heat recovery unit (13), there is an inlet header.
(20) and a blower (14) are provided. Entrance header (2
(0) is an exhaust heat recovery device (13) for supplying air supplied from the blower (14).
Are distributed to each of the air flow paths. An outlet header (21) is provided below the exhaust heat recovery unit (13). The outlet header (21) collects the supply air preheated by the exhaust heat recovery unit (13). A duct (17) for guiding preheated air to the burner (12) is connected to a front side wall (left side in FIG. 1) of the outlet header (21). The duct (17) is the main body
It is arranged straight down to the burner (12) along the lower part of (11).

In the high temperature regenerator (1), the blower (14)
The air supplied from is subjected to heat exchange with the exhaust gas in the exhaust heat recovery unit (13), and is preheated. Preheated air duct
It is supplied to the burner (12) through (17) and used for combustion of the burner (12). The exhaust gas from the burner (12) is exhausted from the furnace tube (18).
It is discharged from (19) and flows into the exhaust heat recovery device (13). The exhaust gas exchanges heat with the supplied air in the exhaust heat recovery unit (13), and after being cooled, flows into the smoke chamber (15). The exhaust gas flowing horizontally into the smoke chamber (15) changes its flow direction in the smoke chamber (15) and is discharged vertically upward. The air led out of the smoke chamber (15) is discharged out of the device through the chimney (16).

As described above, according to the present high-temperature regenerator (1), the exhaust heat recovery unit (13) is constituted by a cross-flow type heat exchanger, and is connected to the exhaust port (19) of the furnace tube (18). Since it is provided between the smoke chamber (15), the heat transfer area can be increased without increasing the height of the exhaust heat recovery unit (13). Therefore, high temperature regenerator
It is possible to increase the amount of exhaust heat recovery while keeping the height of (1) low. As a result, the temperature of the exhaust gas is reduced to a temperature near the dew point (for example, 70 ° C.) while maintaining the dimensions substantially equal to those of a conventional high-temperature regenerator without an exhaust heat recovery unit (see FIG. 6A).
80 ° C.).

Further, since the blower (14) is set in an empty space above the exhaust heat recovery unit (13), the blower (14)
The horizontal length of the high temperature regenerator (1) can be shortened by the installation space of the high temperature regenerator (1). Therefore, in combination with the effect of reducing the height, the overall configuration of the high-temperature regenerator (1) can be further reduced.

Further, since the duct (17) is disposed straight from the exhaust heat recovery unit (13) toward the burner (12) by utilizing the empty space under the main body (11), the flow of the preheated air is reduced. The route can be minimized. Therefore, the pressure loss of the preheated air can be reduced, and the size of the blower (14) can be reduced.

By the way, when the exhaust heat recovery amount in the exhaust heat recovery unit (13) is increased, the cooling amount of the exhaust gas is considerably increased.
It drops to near. As a result, drain (condensed water) is easily generated inside the exhaust heat recovery unit (13). Since such a drain causes corrosion of the exhaust heat recovery unit (13), it is desirable to discharge the drain immediately.

Therefore, as shown in FIG.
At the bottom of the exhaust gas channel of 3), an inclined portion (22) may be provided so as to descend from the furnace tube (18) toward the smoke chamber (15). As a result, the drain (D) generated in the exhaust gas flow path of the exhaust heat recovery device (13) is discharged to the smoke chamber (15) along the inclined portion (22). In addition, as shown in FIG.
The bottom of the smoke chamber (15) should be lower than that of the preferable. This makes it possible to form a drain reservoir for storing drain inside the smoke chamber (15). If a drain outlet (23) is provided on the bottom of the smoke chamber (15), the drain can be continuously discharged.

On the other hand, as shown in FIG.
Alternatively, the entire smoke chamber (15) may be inclined. By inclining the exhaust heat recovery unit (13) and the smoke room (15) so as to descend toward the smoke room (15) side, the drain generated by the exhaust heat recovery unit (13) is removed from the smoke room. (15) Can be continuously discharged.

[Brief description of the drawings]

FIG. 1 is a perspective view of a high-temperature regenerator according to an embodiment.

FIG. 2 is a refrigerant circuit diagram of the absorption refrigerator.

FIG. 3 is a perspective view of a high-temperature regenerator according to a modification.

FIG. 4 is a perspective view of a high-temperature regenerator according to a modification.

FIG. 5 is a perspective view of a conventional high-temperature regenerator provided with an exhaust heat recovery device.

FIG. 6A is a perspective view of a conventional absorption refrigerator without an exhaust heat recovery unit, and FIG. 6B is a perspective view of a conventional absorption refrigerator with an exhaust heat recovery unit. It is.

[Explanation of symbols]

 (1) High temperature regenerator (2) Condenser (3) Evaporator (4) Absorber (5) Low temperature regenerator (6) Low temperature heat exchanger (7) High temperature heat exchanger (11) Main unit (12) Burner (13) Exhaust heat recovery unit (14) Blower (15) Smoke chamber (16) Chimney (17) Duct (18) Furnace (19) Exhaust port (20) Inlet header (21) Outlet header

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 000002853 Daikin Industries Co., Ltd. 2-4-1-12 Nakazaki Nishi, Kita-ku, Osaka-shi, Osaka Umeda Center Building (72) Inventor Atsushi Shitara 1-5-2, Kaigan, Minato-ku, Tokyo No. Tokyo Gas Co., Ltd. (72) Kenji Yamada, Inventor 1-3-1 Kita Port Shiratsu, Konohana-ku, Osaka-shi, Osaka No. Osaka Gas Co., Ltd. (72) Inventor Yuji Ozawa 507-2 Shinhocho, Tokai City, Aichi Prefecture Inside of Gas Co., Ltd. Inside the Kanaoka Factory (72) Inventor Mitsugu Kawai 1304 Kanaokacho, Sakai City, Osaka Daikin Industries Kanaoka Works, Sakai Plant Co., Ltd. The internal F-term (reference) 3K023 QA01 QC01 QC08

Claims (4)

[Claims] 1. A high-temperature regenerator for an absorption refrigerator equipped with an exhaust heat recovery unit (13) for exchanging heat between exhaust gas from a burner (12) and air supplied to the burner (12), A furnace tube (18) provided with (12), and a smoke chamber (15) provided outside the exhaust port (19) of the furnace tube (18)
Wherein the exhaust heat recovery unit (13) is provided between the exhaust port (19) of the furnace tube (18) and the smoke chamber (15). High temperature regenerator. 2. The high-temperature regenerator for an absorption refrigerator according to claim 1, wherein the exhaust heat recovery unit (13) has an exhaust gas passage extending in a horizontal direction and an air supply passage extending in a vertical direction. A high-temperature regenerator for an absorption refrigerator, comprising a cross-flow heat exchanger. 3. The high-temperature regenerator for an absorption refrigerator according to claim 1, wherein a blower (14) for supplying supply air is disposed above the exhaust heat recovery unit (13). A high-temperature regenerator for an absorption refrigerator. 4. The high-temperature regenerator for an absorption refrigerator according to claim 1, wherein the preheated air from the exhaust heat recovery unit (13) is provided below the furnace tube (18). ), Which is provided with a duct (17) for leading to the high temperature regenerator of the absorption refrigerator.