JPS6080061A - Heat recovering device for absorption type cold and hot medium gaining machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention is directed to a mass-effect absorption refrigerator, an absorption heat pump,
This invention relates to a heat recovery device for a multi-effect absorption cold/hot medium acquisition machine (hereinafter referred to as this type of machine), such as an absorption chiller/heater.

(B) Prior Art Conventionally, in the heat recovery device of this type of machine, as explained in Japanese Patent Publication No. 57-18101, for example,
A configuration is known in which the absorption liquid is preheated with a heat source fluid discharged from a generator on the high temperature side. However, such a conventional heat recovery device is designed to raise the temperature of the absorption liquid to an extent that the absorption liquid does not boil, so the heat transmission coefficient of this heat recovery device is about 1000 Km/hr, m, 'C. and low. Therefore, in order to sufficiently recover the waste heat of the heat source fluid, it is necessary to increase the heat transfer area of the heat recovery device, which has the disadvantage of inevitably increasing the size of the heat recovery device.

(c) Purpose of the Invention The present invention aims to recover waste heat from a heat source fluid using a small-sized heat recovery device, and to improve the thermal efficiency of this type of machine.

B) Structure of the Invention The present invention provides a heat recovery device for boiling and evaporating the drain of the refrigerant after heating the low-temperature side generator using the exhaust heat of the heat source fluid, and a heat recovery device for boiling and evaporating the drain of the refrigerant after heating the generator on the low temperature side. This system includes a generator that heats and concentrates an absorption liquid with a low absorbent concentration (hereinafter referred to as a diluted liquid) using a refrigerant.

According to the present invention, since the refrigerant boils and evaporates in the heat recovery device to undergo a phase change, the heat transmission coefficient of the heat recovery device is 2000 Km/hr, which is approximately twice that of a conventional heat recovery device.
Since the exhaust heat can be efficiently recovered using a small heat recovery device, and the dilute liquid is concentrated using the refrigerant that recovered the exhaust heat, the thermal efficiency of this type of machine can be improved.

(E) Embodiment The drawings are schematic configuration explanatory diagrams showing one embodiment of the apparatus of the present invention, in which (1) is a high temperature generator, (2) is a low temperature generator, (3) is a condenser, and (4) is a (5) is an absorber, (6) is a low temperature solution heat exchanger, (7) is a high temperature solution heat exchanger, (8) is a refrigerant pump, and (9) is a solution pump. The flowing refrigerant liquid reflux pipe (+21.C2) and the dilute liquid flow pipe (131°09) are connected to form a circulation path for the refrigerant and absorption liquid. Liquid and intermediate liquid refer to an absorbent liquid whose absorbent concentration is between that of a dilute liquid and a concentrated liquid.

C6) is a heat exchanger built in the evaporator (4), aη, (1
71 is a tube connected to the heat exchanger (10), C81 (I
I is a heat exchanger built into the absorber (5) and condenser (3), respectively, (A), (26, (2111) are heat exchangers -, C
When using the absorption cold medium acquisition machine (hereinafter referred to as this machine) as a refrigerator with a pipe connected in series with 1,
Pipe (171, heat exchanger (161°) A refrigerant such as cold water or cold air is passed through the pipe αD, and the pipe (2o1 heat exchanger (18),
The machine is operated with cooling water, cooling air, etc. flowing between the pipes, heat exchanger a9, and pipe (2o) to obtain the cooled coolant. Also, when using this machine as a heat pump, the pipes αη, A low temperature heat source fluid such as waste hot water or waste steam is passed through the heat exchanger 0 sleep pipe (+71), and the heat exchanger -,
Tube C! α, Heat exchanger [9] is operated while flowing a hot medium such as hot water or hot air through the pipe 6 to obtain heated medium.

(21) is the heat exchanger built into the low temperature generator (2), 02
1 is the combustion chamber of the high temperature generator (1), (2) is the burner, (2) is the flue of the combustion exhaust gas.

C51 is a heat recovery device for combustion exhaust gas, and this heat recovery device is connected to the pipe 00.00) and has a built-in heater (4). In addition, (5) is the third generator, (2 old house third generator @ and the branch pipe that connected pipe (13), (c) is the third generator (5) and low temperature generator (2) connected A pipe through which the absorption liquid flows, 01) is a pipe through which a refrigerant flows, which connects the third generator (5) and the condenser (3), and 01) is a heat supply device built into the third generator (5). Note that (c) is a preheater provided so that the absorption liquid flowing into the third generator (product) is heated in advance by the combustion exhaust gas after passing through the heat recovery device (c).

Next, an example of the operation of the heat recovery device of this machine configured as described above will be briefly described. The refrigerant vapor heated and separated from the absorption liquid by the combustion gas in the high temperature generator (1) is passed through the pipe fIt.
) The absorption liquid (intermediate liquid) in the C1 low-temperature generator (2) which flows into the heat exchanger Q11 via ) is heated and concentrated, while the absorption liquid itself is condensed and becomes drain. The refrigerant that has drained in the heat exchanger QI reaches the heat recovery device Q51 via the pipe (Iυ) and is stored in this heat recovery device. It is heated by the combustion exhaust gas flowing through (a), boils, and becomes refrigerant vapor again.In this way, in the heat recovery device +251, the refrigerant that recovers the heat of the combustion exhaust gas boils and changes its phase from liquid to vapor. Therefore, the heat transmission coefficient on the refrigerant side is approximately 2000 Km/hr, m', 'c.Therefore, this heat recovery device C is a heat recovery device that only raises the temperature of the absorption liquid. The heat transmission coefficient on the liquid side is approximately 1000 Km/hr, mi, 'C.], heat can be recovered with higher efficiency.

Then, the refrigerant that became vapor in the heat recovery device (c) reaches the heat supply device 01) via the pipe 0α, and this refrigerant flows into the absorption liquid [ [dilute liquid] is heated and concentrated, and it condenses again and becomes drain. Heater f3
The refrigerant that has become a drain in B is sent to the condenser (via pipe a).
3), and the absorbed liquid concentrated in the third generator (27) passes through the pipes to the low temperature generator (2). Further, the refrigerant separated from the absorption liquid in the third generator (5) reaches the condenser (3) via the pipe (to).

In this way, in this machine, the refrigerant that has recovered the heat of the combustion exhaust gas with high efficiency undergoes a phase change from vapor to liquid in the heat supply device 01), and the heat transfer coefficient on the refrigerant side in this heat supply device is approximately 40.
00 Kcat/hr, yj, °C, and the absorption liquid concentrated by the recovered heat in the third generator (2η) is introduced into the low-temperature generator (2). Compared to conventional machines of this type, which only raise the temperature of the absorbent liquid using combustion exhaust gas, the absorbent liquid is concentrated (refrigerant separation) is performed with higher efficiency, improving thermal efficiency.

In the device of the present invention, the waste heat fluid supplied to the heat recovery device (second stage) is not limited to combustion exhaust gas, but may be a heat recovery device (fluid with a temperature sufficient to boil the refrigerant in the second stage). In addition, there is a condenser (inside the heat recovery device 251).
3) or the refrigerant liquid may be introduced from the evaporator (4) side.

(F) Effects of the Invention As described above, the present invention provides a machine of this kind in which the refrigerant liquid after heating the generator on the low temperature side is boiled by the exhaust heat of the heat source fluid in the heat recovery device, and converted into steam. Since the phase-changed refrigerant is used to concentrate the dilute liquid, it can be discharged with higher efficiency than conventional machines of this type, which are equipped with a heat recovery device that raises the temperature of the absorbent liquid using the exhaust heat of the heat source fluid. Heat can be recovered and the thermal efficiency of this type of machine can be further improved. In other words, the heat recovery device of the present invention can be made smaller than the conventional heat recovery device, which only raises the temperature of the liquid without causing a phase change. ) has practical value in that it can improve the thermal efficiency of

[Brief explanation of drawings]

The drawing is a schematic structural explanatory diagram showing an embodiment of the device of the present invention. (1)...High temperature generator, (2)...Low temperature generator,
(3)... Condenser, (4)... Evaporator, (5)
...absorber, (6) ...low temperature solution heat exchanger, (
7)...High temperature solution heat exchanger, (11°CI!4),
(24)... Flue, C51... Heat recovery device, (a)... Heater, (5)... Third generator, (281
...branch pipe, 翰, (to)...tube, C31)...
Heater.

Claims (1)

[Claims] (1) In a multi-effect absorption refrigerant acquisition machine that uses refrigerant vapor from a high-temperature side generator as a heating source for a low-temperature side generator, the refrigerant after being used as a heating source for a low-temperature side generator is heated to a high temperature. The refrigerant flow path is equipped with a heat recovery device that evaporates again using the heat source fluid discharged from the side generator, and the refrigerant evaporated in this heat recovery device heats the absorption liquid with a low absorbent concentration from the absorber side. A heat recovery device for an absorption type refrigerant/hot medium acquisition machine, characterized in that a generator for concentrating the refrigerant and the absorption liquid is provided in the circulation path of the refrigerant and the absorption liquid.