JP3418776B2 - Bleeding device for absorption chiller / heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for extracting non-condensable gas generated in an absorption chiller / heater, and more particularly, to an evaporator / absorption by an ejector driven by an absorption liquid pressurized by a solution circulation pump. The present invention relates to a bleeding device for bleeding a non-condensable gas in a container.

[0002]

2. Description of the Related Art Conventionally, a non-condensable gas generated in an absorption chiller / heater is extracted from an evaporator / absorber by an ejector driven by an absorption liquid pressurized by a solution circulation pump as an extraction device. There is an example disclosed in JP-B-7-84970. In the example disclosed in Japanese Examined Patent Publication No. 7-84970, as shown in FIG. 6, the gas storage chamber and the absorber are connected by an absorption liquid circuit, and the absorption liquid is caused to flow into the gas storage chamber and the evaporator. / The pressure of the absorber is equalized, and during heating operation,
That is, it is intended to prevent a large amount of solution pool in the gas storage chamber in an operating state in which the pressure in the absorber is higher than in the cooling operation.

[0003]

In the apparatus disclosed in the above-mentioned publication, as shown in FIG. 6, a liquid surface of the absorbing liquid is formed in the gas storage chamber, and a pipe P ₂ from the gas storage chamber to the absorber is formed.
Is liquid sealed. The flow rate of the absorption liquid flowing into the gas storage chamber from the discharge side of the solution circulation pump is determined by the orifice O ₁ , but the driving force for returning the absorption liquid flowing into the gas storage chamber from the gas storage chamber to the absorber at the same flow rate is It is the differential pressure based on the head difference between the liquid level of the absorbing liquid in the gas storage chamber and the liquid level of the absorbing liquid in the absorber. Therefore, if the flow rate of the absorbing liquid flowing into the gas storage chamber increases due to fluctuations in the operating state (load factor, cooling water temperature, etc.) of the chiller-heater, the head difference increases to increase the return flow rate to the absorber. As a result, the liquid level of the absorbing liquid in the gas storage chamber rises. In other words, a large amount of absorbing liquid accumulates in the gas storage chamber, and the absorbing liquid circulating in the refrigeration cycle decreases. If the amount of absorption liquid circulating in the refrigeration cycle decreases, cavitation of the solution circulation pump or empty heating of the high temperature regenerator may occur, and stable operation cannot be maintained.

An object of the present invention is to extract a non-condensable gas in an evaporator / absorber by an ejector driven by an absorption liquid pressurized by a solution circulation pump and send it to a gas storage chamber. This is to prevent a large amount of absorbing liquid from accumulating in the gas storage chamber during heating operation.

[0005]

The first means of the present invention for achieving the above object is to extract the air from the inside of the evaporator and / or the absorber 1 using the absorbing liquid pressurized by the solution circulation pump 2. A gas separator 4 for separating a condensable gas and an absorbing liquid used for extraction, and a non-condensed gas separator 4 arranged above the gas separator 4 and connected to the gas separator 4 by a gas rising pipe 12 Gas storage chamber 3 for storing a volatile gas, a separation solution return pipe 13 connected between the gas separator 4 and the absorber 1 for returning the separated absorption liquid to the absorber 1, and a discharge of the solution circulation pump 2. an absorption liquid supply pipe 7 communicating the gas storage chamber 3 bottom and side pipe, a flow restricting means 6 for limiting the absorption liquid flow rate is interposed the absorbent liquid supply pipe 7, it comprises a gas storage chamber 3 The bottom surface is located at a position higher than the bottom surface of the absorber 1 by a distance H. In bleed system of the absorption chiller at a lower position than the connecting position of the connecting position between the gas separator 4 of the return pipe 13 to the absorber 1, the gas storage chamber bottom and a gas
An absorption liquid return pipe for connecting the separator is provided, and the flow rate limiting means 6 operates under the operating condition in which the flow rate of the absorption fluid passing through the flow rate limiting means 6 and flowing into the gas storage chamber 3 is maximum. The flow rate is set so that the head difference required to recirculate the maximum flow rate from the gas storage chamber 3 to the absorber 1 through the absorbent return pipe 8 is equal to or less than H.

The second means of the present invention for achieving the above object is the same as the first means, wherein the absorbent supply pipe 7 and the absorbent return pipe 8 are separated from each other at both longitudinal ends of the bottom surface of the gas storage chamber 3. Connection, a rectifying plate 14 is provided on the side of the absorption liquid supply pipe 7 at the opening of the bottom face of the gas storage chamber 3 of the absorption liquid return pipe 8, and the rectification plate 14 is provided on the entire bottom face of the gas storage chamber 3. It forms a flow path.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the following description, description of the configuration of the absorption chiller-heater will be omitted, and only the extraction device will be described.

FIG. 1 shows a first embodiment of the present invention. The bleeding device shown in the drawing is an ejector solution pipe 10 provided branching to a discharge side pipe of a solution circulation pump 2 for sucking and pressurizing an absorbing liquid from the bottom of the absorber 1, and a downstream end of the ejector solution pipe 10. Ejector 5 connected to the drive water inlet
And a gas inflow pipe 9 which connects the suction port of the ejector 5 and the gas phase portion of the absorber 1, and an upper portion of the gas inflow pipe 9 arranged below the ejector 5 through a gas-liquid descending pipe 11 connected to the discharge port of the ejector 5. Gas separator 4, separation solution return pipe 13 that connects the bottom of gas separator 4 to the lower part of absorber 1, and the position where the bottom is higher than the bottom of absorber 1 and higher than the top of gas separator 4. The gas storage chamber 3 disposed in the gas storage chamber 3 and the discharge side pipe of the solution circulation pump 2, the absorption liquid supply pipe 7 whose downstream end is connected to the bottom of the gas storage chamber 3, and the absorption liquid supply pipe. Orifice 6 which is a flow rate limiting means interposed in 7
An absorption liquid return pipe 8 that connects the bottom of the gas storage chamber 3 to the bottom of the absorber 1, and a gas rising pipe 12 that connects the gas phase portion of the gas storage chamber 3 to the upper portion of the gas separator 4. It is composed of.

The gas separator 4 is arranged so that its bottom surface is lower than the bottom surface of the absorber 1, and the absorption liquid return pipe 8 passes through a part of the absorption liquid return pipe 8 lower than the bottom portion of the absorber 1. It is arranged. Gas separator 4 of separation solution return pipe 13
The connection position with and is lower than the connection position with the absorber 1.

The orifice 6 has a flow rate under the following operating conditions where the flow rate of the absorbing liquid passing through the orifice 6 is maximum, that is, the maximum flow rate under all operating conditions is
The head difference required to flow an amount of absorbing liquid equal to the maximum flow rate from the gas storage chamber 3 to the absorber 1 is calculated from H in FIG. 1 (height difference between the bottom surface of the gas storage chamber 3 and the bottom surface of the absorber 1). Is also set to be smaller. Cooling water temperature is high, maximum load operation is ... Condition that discharge pressure of solution circulation pump is maximum Gas storage amount is 0 ... Condition that outlet 6 outlet pressure is minimum

When the absorption chiller / heater equipped with the bleeder having the above-mentioned structure is operated, the amount of the absorbing liquid flowing into the gas storage chamber 3 through the absorbing liquid supply pipe 7 having the orifice 6 interposed, that is, the gas storage. The amount of absorbing liquid returning from the chamber 3 to the absorber 1 via the absorbing liquid return pipe 8 is below the maximum flow rate under any operating condition. The head difference required to return the absorbing liquid from the gas storage chamber 3 to the absorber 1 at the maximum flow rate is smaller than the height difference between the bottom surface of the gas storage chamber 3 and the bottom surface of the absorber 1. Even if the amount of the absorption liquid flowing into the gas storage chamber 3 through the absorption liquid supply pipe 7 is the maximum flow rate, the liquid surface is not formed in the gas storage chamber 3. The required head difference is obtained at a position where the liquid level of the absorbing liquid is lower than the bottom surface of the gas storage chamber 3, that is, the liquid level is in the absorbing liquid return pipe 8. Even when the operating conditions change and the amount of the absorbing liquid flowing into the gas storage chamber 3 through the absorbing liquid supply pipe 7 changes, the liquid level position of the absorbing liquid changes in the absorbing liquid return pipe 8, The liquid level does not rise in the gas storage chamber 3, and therefore, the absorbing liquid is not stored in the gas storage chamber 3 either.

According to the present embodiment, during heating operation, a large amount of the absorbing liquid is not stored in the gas storage chamber, the amount of the absorbing liquid circulating in the refrigeration cycle is reduced, and the solution circulation pump causes cavitation. It is possible to avoid waking up and leaving the regenerator in an empty state.

FIG. 2 shows a second embodiment of the present invention. This embodiment is different from the first embodiment in that an absorption liquid supply pipe 7 for introducing the absorption liquid into the gas storage chamber 3 and an absorption liquid return pipe 8 for guiding the absorption liquid from the gas storage chamber 3 to the absorber are provided. , Gas storage room 3
Is connected to both ends in the longitudinal direction of the gas separation chamber 8 so as to be separated from each other, and is arranged at the position of the absorption liquid return pipe 8 on the opening side of the bottom surface of the gas storage chamber 3.
Is provided. Since the other structure is the same as that of the first embodiment, the same reference numerals are given and the description thereof is omitted. The current plate 14 is provided in a weir shape around the absorbent return pipe 8 on the bottom surface of the gas storage chamber 3. Instead of the rectifying plate 14, the end of the absorbent return pipe 8 may be slightly projected on the bottom surface.

The reason why the absorption liquid is caused to flow into the gas storage chamber is to use the saturated vapor pressure of the absorption liquid to equalize the pressures of the gas storage chamber 3 and the absorber / evaporator. Three
It is desirable that the absorption liquid flow over the entire bottom surface of the. Further, if the bottom surface of the gas storage chamber 3 is inclined, the flow of the absorbing liquid may be biased, and the absorbing liquid may not flow over the entire bottom surface of the gas storing chamber 3. By providing an inlet and an outlet for the absorbing liquid at positions separated from each other in the longitudinal direction of the gas storing chamber 3, the flowing range of the absorbing liquid can be widened and the absorbing liquid can flow over the entire bottom surface of the gas storing chamber 3. . Further, by providing the straightening plate on the bottom surface near the outlet of the absorbing liquid, the absorbing liquid can flow over the entire bottom surface of the gas storage chamber 3.

According to the present embodiment, in addition to the effects of the first embodiment, the absorption liquid flows over the entire bottom surface of the gas storage chamber 3, so that the absorption liquid causes the gas storage chamber 3 and the absorber / evaporator to operate. Ensures equalization.

FIG. 3 shows a third embodiment of the present invention. This embodiment is different from the second embodiment in that the bottom of the gas storage chamber 3 and the top of the gas separator 4 are replaced by the absorption liquid return pipe 8 connecting the bottom of the gas storage chamber 3 and the lower part of the absorber 1. That is, the absorption liquid return pipe 8'to be connected is provided. Since the other structure is the same as that of the second embodiment, the same reference numerals are given and the description thereof is omitted.

As described in the first embodiment,
The orifice 6 has a head difference required for flowing the maximum flow rate from the gas storage chamber 3 to the absorber 1 under the operating conditions in which the maximum flow rate of the absorbing liquid passing through the orifice 6 is the same as the bottom surface of the gas storage chamber 3. The specifications are set so as to be smaller than the height difference of the bottom surface of the container 1. Therefore, as shown in FIGS.
In this embodiment, the liquid level of the absorbing liquid in the absorbing liquid return pipe 8 is
Depending on the amount of non-condensable gas stored in the gas storage chamber 3,
It varies within the range shown in FIG. When the liquid surface position in the absorbent return pipe 8 is lowered to the position shown in FIG. 5, the force of the absorbent flowing down in the absorbent return pipe 8 causes the absorbent return pipe 8 to move.
The gas inside becomes fine bubbles, and together with the absorbing liquid, the absorber 1
And the bleeding is incomplete, and the capacity of the refrigeration cycle is reduced.

By replacing the absorbent return pipe 8 connecting the bottom of the gas storage chamber 3 with the lower part of the absorber 1, an absorbent return pipe 8'connecting the bottom of the gas storage chamber 3 with the upper face of the gas separator 4 is provided. , Due to the effect of the liquid level decreased due to the increase in gas storage volume,
The non-condensable gas flowing as bubbles in the absorbent return pipe 8 ′ together with the absorbent flows into the gas separator 4. The non-condensable gas that has flowed into the gas separator 4 is separated from the absorbing liquid here, rises through the gas rising pipe 12, and is stored in the gas storage chamber 3.

According to this embodiment, in addition to the effect obtained by the second embodiment, there is an effect that even when the gas storage amount is increased, a stable extraction capacity can be exhibited and the refrigerating performance can be maintained.

[0020]

According to the present invention, it is possible to prevent a large amount of the absorbing liquid from being stored in the gas storage chamber during the heating operation, and the amount of the absorbing liquid circulating in the refrigeration cycle is not significantly reduced. Therefore, the operation of the absorption chiller-heater can be stably maintained without the risk of cavitation of the solution circulation pump and emptying of the regenerator.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration explanatory view showing a second embodiment of the present invention.

FIG. 3 is a schematic configuration explanatory view showing a third embodiment of the present invention.

FIG. 4 is a conceptual diagram illustrating a variation range of the liquid level of the absorbent in the absorbent return pipe according to the embodiment of the present invention.

FIG. 5 is a conceptual diagram illustrating a flow of a non-condensable gas when the liquid level of the absorption liquid return pipe on the gas separation chamber side is low.

FIG. 6 is a schematic configuration explanatory view showing an example of a conventional technique.

[Explanation of symbols]

1 absorber 2 Solution circulation pump 3 gas storage room 4 gas separator 5 ejectors 6 orifices 7 Absorbing liquid supply pipe 8,8 'Absorption liquid return pipe 9 gas inflow pipe 10 ejector solution tube 11 Gas-liquid downfall 12 gas riser 13 Separation solution return pipe 14 Current plate

Continuation of the front page (56) References JP-A-52-7053 (JP, A) JP-A-58-26976 (JP, A) JP-A-63-32267 (JP, A) Actual development 61-259066 (JP) , U) Japanese Patent Publication 7-84970 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 43/04 F25B 15/00

Claims (2)

(57) [Claims] 1. A gas separator for separating the non-condensable gas extracted from the evaporator and / or the absorber using the absorption liquid pressurized by a solution circulation pump and the absorption liquid used for the extraction, and this gas. A gas storage chamber disposed above the separator and connected to the gas separator by a gas rising pipe to store the separated non-condensable gas; and a gas storage chamber connected between the gas separator and the absorber. The separated solution return pipe for returning the absorbed liquid to the absorber, the absorption liquid supply pipe communicating the discharge side pipe of the solution circulation pump with the bottom surface of the gas storage chamber, and the absorption liquid flow rate interposed in the absorption liquid supply pipe. comprise a flow restriction means for restricting become, gas storage chamber bottom face is in a position higher distance H than the absorber bottom, the connection position between the gas separator of the separating solution return pipe connection to the absorber For the extraction device of the absorption chiller-heater located at a position lower than the position The bottom of the gas storage room and the gas
An absorption liquid return pipe for connecting a separator is provided, and the flow rate limiting means is configured to maximize the flow rate of the absorption fluid which passes through the flow rate limiting means and flows into the gas storage chamber. An extraction apparatus for an absorption chiller-heater, wherein a flow rate is set so that a head difference required for returning the flow rate from the gas storage chamber to the absorber through the absorption liquid return pipe is equal to or less than H. 2. The absorbing liquid supply pipe and the absorbing liquid return pipe are connected to both ends of the bottom face of the gas storage chamber in the longitudinal direction, and the absorbing liquid supply pipe side of the opening of the gas storage chamber bottom face of the absorbing liquid return pipe. A rectifying plate is provided on the gas storage chamber, and the rectifying plate forms an absorbing liquid flow path on the entire bottom surface of the gas storage chamber.
The extraction device for an absorption chiller-heater according to claim 1.