JPH0345089Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an absorption heat pump equipped with a non-condensable gas evacuation device. This is done by lowering the temperature of the absorption liquid with a low-temperature refrigerant liquid after extracting the non-condensable gas including hydrogen gas and refrigerant vapor in the condenser, and increasing the absorption of refrigerant vapor into the absorption liquid in the bleed chamber. It is used in the field of smooth discharge of non-condensable gas and reuse of absorbed refrigerant vapor by lowering the pressure in the bleed chamber than the pressure in the condenser.

[Prior art]

In an absorption heat pump that is composed of vacuum vessels such as an evaporator, absorber, regenerator, and condenser, water as a refrigerant and an aqueous lithium bromide solution as an absorption liquid are circulated in the form of liquid or refrigerant vapor. This allows hot water or steam to be obtained in the absorber. In such an absorption heat pump, the internal pressure of the evaporator and absorber is approximately 500 mmHg, and the internal pressure of the regenerator and condenser is approximately 40 mmHg. Therefore, although airtightness is achieved by welding, etc., a small amount of air may still get in.
An iron vacuum container is oxidized by the moisture in the refrigerant and absorption liquid, forming an oxide film. The hydrogen gas generated at this time and the air that enters are noncondensable gases and remain in the vacuum container. Among them, non-condensable gas from the regenerator is introduced into the condenser together with refrigerant vapor through a pipe line and collected in a group of tubes of the condenser. This noncondensable gas significantly reduces the heat transfer effect in the tube group of the condenser and also causes corrosion of the tube group. Therefore, it is a very important issue for absorption heat pumps to efficiently discharge such non-condensable gases to the outside. Therefore, the non-condensable gas evacuation device of the conventional absorption heat pump is
As shown in FIG. 1, non-condensable gas and refrigerant vapor in a condenser 1 are sent to a bleed chamber 3 through a non-condensable gas outlet pipe 2 by utilizing the ejector effect. That is, the absorption liquid stored in the liquid reservoir 4a of the regenerator 4 is transferred by the absorption liquid pump 5, and is cooled by the heat exchanger 6 with cold water or cooling water supplied from the outside. This absorption liquid is allowed to flow down into the absorption liquid stored in the bleed chamber 3, and non-condensable gas and refrigerant vapor are mixed in by the effluent action at this time. The non-condensable gas can then be discharged to the outside via the bleed chamber 3, the air supply pipe 7, the gas-liquid separation chamber 8, the delivery pipe 9, and the non-condensable gas tank 10. Note that the absorption liquid into which refrigerant vapor has been mixed and absorbed in the bleed chamber 3 is returned to the liquid reservoir 4a of the regenerator 4 through the absorption liquid return pipe 11. by the way,
Cooling the absorption liquid with external cold water or cooling water increases the absorption of refrigerant vapor into the absorption liquid, prevents the refrigerant vapor from floating in the absorption liquid in the form of light bubbles, and The pressure inside the bleed chamber 3 is transferred to the condenser 1.
This is to efficiently discharge non-condensable gas from the air pipe by lowering the pressure below that of . However, if external cold water or cooling water is used to cool the absorption liquid, a portion of the heat of the absorption liquid will be discarded to the outside, resulting in a problem of increased heat loss.

[Purpose of invention]

This invention was developed to solve the above-mentioned problems, and it uses the heat within the system to cool the absorption liquid flowing into the extraction tank, and also reuses the refrigerant liquid after cooling. An object of the present invention is to provide an absorption heat pump equipped with a non-condensable gas discharge device that can be used for heat recovery.

[Structure of the idea]

The features of the present invention will be explained with reference to FIG. 2. The non-condensable gas and refrigerant vapor containing hydrogen gas in the condenser 1 are led out from the space above the refrigerant liquid level in the condenser 1. A gas derivation conduit 2 and an absorption liquid derivation conduit 13 for deriving the absorption liquid stored at the bottom of the regenerator 4 via an absorption liquid pump 15 are provided,
The absorption liquid from this absorption liquid delivery pipe 13 is allowed to fall into the stored absorption liquid, and the non-condensable gas delivered from the non-condensable gas delivery pipe 2 is mixed into the absorption liquid, and then the head Using the delivery pipe 20
A bleed chamber 3 is provided at a position higher than the return port 4A of the absorption liquid return pipe 19 that returns the absorption liquid from the gas-liquid separation chamber 18 to the regenerator 4. The non-condensable gas separated from the absorption liquid in the chamber 18 is introduced via the air pipe 22 and is stored in the non-condensable gas tank 21.
However, in the case of an absorption heat pump installed at a position higher than the return port 4A of the absorption liquid return pipe 19, the refrigerant liquid in the condenser 1 transferred to the evaporator 23 flows through the absorption liquid outlet pipe 13. The absorption heat pump is equipped with a non-condensable gas discharge device equipped with a heat exchanger 25 for cooling the absorption liquid.

〔Example〕

EMBODIMENT OF THE INVENTION Below, the absorption heat pump of this invention will be explained in detail based on the drawing which shows the Example.

FIG. 2 is a system diagram of an absorption heat pump including a non-condensable gas discharge device 12, which is an embodiment of the present invention. The condenser 1 is provided with a non-condensable gas lead-out conduit 2 that protrudes into a space above the refrigerant liquid level through which non-condensable gas and refrigerant vapor can be led out, and the other end is connected to a bleed chamber 3. This bleed chamber 3 is provided with one end of an absorbent liquid lead-out conduit 13 for transferring the absorbent liquid from the liquid reservoir 4a of the regenerator 4 so as to protrude inside. In this embodiment, the absorption liquid outlet pipe 13 is connected to a discharge side branch point 16 of an absorption liquid pump 15 that transfers the absorption liquid in the liquid reservoir 4a to the absorber 14. On the bottom surface 3A of the bleed chamber 3, in order to maintain the upper limit of the water level of the absorption liquid stored therein,
The upper end of the overflow pipe 17 is connected, and the lower end thereof is connected to the upper surface 18A of the gas-liquid separation chamber 18 to which the absorption liquid is sent. The inside of this gas-liquid separation chamber 18 is filled with absorption liquid, and an absorption liquid return pipe 19 returns the introduced absorption liquid to the liquid reservoir 4a of the regenerator 4.
is connected to the return port 4A of the regenerator 4. By the way, on the bottom surface 3A of the above-mentioned air bleed chamber 3, there is also a delivery pipe 20 that sends out non-condensable gas by utilizing the head difference between the return port 4A and the absorption liquid level in the bleed tank 3. protrudes into the gas-liquid separation chamber 18. In addition, an air supply pipe 22 for storing the non-condensable gas sent to the gas-liquid separation chamber 18 in the non-condensable gas tank 21 is provided therebetween.
Note that the inside of this air supply pipe 22 is filled with absorption liquid to at least the same level as the return port 4A of the regenerator 4, but when the absorption liquid level is pushed down to the gas-liquid separation chamber 18, the head The pressure of the non-condensable gas in the non-condensable gas tank 21 is increased accordingly, and the discharge of the gas to the outside is facilitated. On the other hand, in the condenser 1, the liquid pool 1
A refrigerant liquid pipe line 24 is provided to transfer the refrigerant liquid stored in the evaporator 23 to the evaporator 23, and a heat exchanger 25 is provided to exchange heat between the refrigerant liquid pipe line 24 and the above-mentioned absorption liquid outlet pipe 13. .

According to such a configuration, it can be operated as follows.

The pressure inside the evaporator 23 and absorber 14 is approximately 500mm.
Hg, the pressure inside condenser 1 and regenerator 4 is a vacuum of 40 mmHg, and non-condensable gases including air entering from the outside and hydrogen gas generated inside remain in the tube group. ing. Among these non-condensable gases, the non-condensable gas in the regenerator 4 is introduced into the condenser 1 via the pipe 26 together with the refrigerant vapor. On the other hand, the absorption liquid stored in the liquid reservoir 4a of the regenerator 4 is transferred by the absorption liquid pump 15, and a part of it is supplied to the bleed chamber 3 through the branch point 16, the absorption liquid outlet pipe 13, and the heat exchanger 25. Ru. At this time, the absorbed liquid exerts an ejector effect, and the non-condensable gas and refrigerant vapor in the condenser 1 are introduced into the bleed chamber 3 via the non-condensable gas outlet pipe 2, and the absorbed liquid mixed in. By the way, the refrigerant vapor introduced into the condenser 1 from the regenerator 4 is turned into a low-temperature refrigerant liquid by the cooling water introduced through the pipe line 27, and accumulates in the liquid reservoir 1a. While this refrigerant liquid is being transferred to the evaporator 23 through the refrigerant liquid pipe line 24, the absorption liquid heading from the regenerator 4 to the bleed chamber 3 is cooled by the heat exchanger 25.
After the temperature is raised, the liquid flows into the liquid reservoir 23a of the evaporator 23. As a result, the temperature of this refrigerant liquid increases, so that when it is heated by the heat source introduced from the outside in the evaporator 23, it is promoted to become refrigerant vapor. On the other hand, the polarity whose temperature has become lower in the heat exchanger 25 is supercooled and becomes in a state where it is easy to absorb refrigerant vapor, and the pressure in the bleed chamber 3 is lowered than the pressure in the condenser 1. When the absorption liquid flows down in the bleed chamber 3 in this state, the refrigerant vapor is absorbed by the absorption liquid, so that the refrigerant vapor does not float in the delivery pipe 20 in the form of bubbles, and the pressure in the bleed chamber 3 is reduced to the condenser 1. Since the pressure is lower than that of
is passed through. The absorption liquid that has flowed into the gas-liquid separation chamber 18 is returned to the regenerator 4 via the absorption liquid return pipe 19 due to the head difference between the bleed chamber 3 and the return port 4A of the regenerator 4. On the other hand, the non-condensable gas is separated from the absorption liquid stagnant in the gas-liquid separation chamber 18 and stored in the non-condensable gas tank 21 via the air pipe 22. When the non-condensable gas fills the non-condensable gas tank 21, the pressure is increased while pushing down the absorption liquid inside the air supply pipe 22.
It is released from the pipe 28 to the outside.

[Effect of idea]

As explained in detail above, the present invention is equipped with a heat exchanger that cools the absorption liquid introduced into the bleed chamber with the refrigerant liquid of the condenser. By discarding the heat to the outside, you can avoid the heat loss described above. In addition, the refrigerant liquid after cooling the absorption liquid is transferred to the evaporator and can contribute to heat recovery.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an absorption heat pump equipped with a conventional non-condensable gas discharge device, and FIG. 2 is a system diagram of an absorption heat pump equipped with a non-condensable gas discharge device of the present invention. 1...Condenser, 2...Noncondensable gas outlet pipe,
3...Bleed chamber, 4...Regenerator, 4A...Return port,
13... Absorption liquid outlet pipe line, 15... Absorption liquid pump, 18... Gas-liquid separation chamber, 19... Absorption liquid return pipe line, 20... Delivery pipe, 21... Non-condensable gas tank, 22... Air pipe, 23...Evaporator, 25...
Heat exchanger.

Claims (1)

[Scope of Claim for Utility Model Registration] A non-condensable gas derivation pipe for deriving non-condensable gas including hydrogen gas and refrigerant vapor from the space above the refrigerant liquid level in the condenser, and a regenerator bottom part. An absorption liquid outlet pipe is provided to draw out the stored absorption liquid via an absorption liquid pump, and the non-condensable gas is removed by causing the absorption liquid from the absorption liquid outlet line to flow down into the stored absorption liquid. After mixing the non-condensable gas sent out from the outlet pipe into the absorption liquid, the bleed chamber uses the head to send it to the gas-liquid separation chamber via the delivery pipe. A non-condensing system is installed at a position higher than the return port of the absorption liquid return pipe that returns the liquid, and the non-condensable gas separated from the absorption liquid in the gas-liquid separation chamber is introduced via the air supply pipe and stored. In an absorption heat pump in which a reactive gas tank is provided at a position higher than the return port, a heat exchanger is provided that cools the absorption liquid flowing through the absorption liquid outlet pipe by the refrigerant liquid in the condenser that is transferred to the evaporator. 1. An absorption heat pump equipped with a non-condensable gas discharge device, characterized in that the absorption heat pump is provided with a non-condensable gas discharge device, and is capable of enhancing the absorption effect of refrigerant vapor in the bleed chamber and improving the discharge of non-condensable gas.