JPH03225163A - absorption heat pump - 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] Industrial applications The present invention relates to an absorption heat pump.

BACKGROUND OF THE INVENTION Conventionally, absorption heat pumps (hereinafter referred to as heat pumps) have been used to recover heat from heat source fluids.

This heat pump will be explained based on FIG. 2. That is, a part of the heat source fluid (a) is guided to the evaporator 31, and while passing through the heat transfer tube 32, it heats and evaporates water (b), which is a refrigerant, forming a falling liquid film outside the tube. This water vapor is guided to the absorber 33 and absorbed by the concentrated absorption liquid (L i Br aqueous solution) (C) that forms a falling liquid film outside the heat exchanger tube 34 , becoming high temperature and flowing inside the heat exchanger tube 34 . Flowing heated fluid (d)
heat up. On the other hand, the dilute absorption liquid (e) whose concentration has become diluted by absorbing water vapor is sent to the regenerator 36 by the pump 35, where it is heated by the remaining heat source fluid (a) flowing in the heat transfer tube 37 and absorbed by the dilute absorption liquid (e). The liquid (e) is concentrated by evaporating water, and the concentrated absorption liquid (C) is sent to the absorber 33 by the pump 38 and reused. Also, regenerator 3
The steam generated in step 6 is guided to the condenser 38 and passed through the heat exchanger tube 3.
8 is condensed by the cooling water (f) flowing through the pump 40.
is sent to the evaporator 31 and reused. In addition, 41
is a heat exchanger that exchanges heat between a dilute absorption liquid (e) and a concentrated absorption liquid (C).

Problems to be Solved by the Invention However, according to the above conventional configuration, the heat source fluid (a
) is ruptured, fluids that cannot be mixed with the absorbing liquid (e.g., ethylene oxide, sulfuric acid, etc.) cannot be used as a heat source fluid, and therefore thermal energy cannot be recovered. The problem was that it couldn't be done.

Therefore, an object of the present invention is to provide an absorption heat pump that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the absorption heat pump of the present invention is an absorption heat pump having an evaporator, an absorber, a regenerator, and a condenser, which generates water vapor by heating with a heat source fluid. It is equipped with a steam generator, and the steam from the steam generator is guided as a heating fluid to the heat transfer tubes of the evaporator and regenerator, and the condensed water is returned to the steam generator.

Operation According to the above configuration, the heat source fluid is guided into the steam generator to generate steam, and this steam is guided to the heat transfer tubes in the evaporator and regenerator to act as a heating fluid. Therefore, there is no risk of contact between the heat source fluid and the absorption liquid, and therefore any heat source fluid can be used as the heat source of the absorption heat pump.

Example An embodiment of the present invention will be described below with reference to FIG.

In addition, in this absorption heat pump, water is used as a refrigerant, and a lithium bromide aqueous solution is used as an absorption liquid, for example.

In FIG. 1, ``■'' is the unit body of the absorption heat pump, and since this part is the same as the conventional one, it will be briefly explained.

That is, this unit main body 1 has an evaporator 2, an absorber 3, a regenerator 4, a condenser 5, and a heat recovery device 6, and inside the evaporator 2 and the regenerator 4, heating is provided. Heat exchanger tubes 7.8 for flowing fluid A are respectively arranged. Further, heat transfer tubes 9 for flowing the heated fluid B are arranged in the absorber 3, and heat transfer tubes 10 for flowing the cooling fluid C in the condenser 5, respectively.

Next, a configuration for supplying water vapor as a heating fluid to the unit main body 1, which is the gist of the present invention, will be explained.

In other words, the absorption heat pump in this example has:
A steam generator 13 having a heat transfer tube 12 through which a heat source fluid generated in a factory, for example, flows is provided inside the container body 11, and the steam generated here is transferred to a first transfer tube '1.
4 into heat exchanger tubes 7 and 8 in the evaporator 2 and regenerator 4. And these heat exchanger tubes 7,
The water passed through 8 and condensed is transferred to a transfer pump 15 on the way.
It is returned to the container main body 11 side via the second transfer pipe 16 having a diameter. Further, a condensed water circulation pipe 18 is provided which has a circulation pump 17 in the middle and causes the condensed water returned into the container body 11 to fall into a liquid film from the lower part to the outer periphery of the upper heat transfer tube 12. The container body 11 is provided with a liquid level gauge 19, and a control valve 20 controlled by the liquid level gauge 19 is provided in the middle of the second transfer pipe 16. The liquid level inside the container body 11 is controlled by the liquid level gauge 19 and the control valve 20 to prevent the pumps 15, 17 from running idle. The heat source of the absorption heat pump is 10
Since the temperature is often below 0°C, the generated steam is below atmospheric pressure.
The interior is also evacuated in advance using a vacuum pump 21.

According to the above configuration, the heat source fluid enters the steam generator 13 and generates steam using the heat it possesses, and the generated steam is transmitted to the evaporator 2 and the regenerator 4 via the first transfer pipe 14. It flows through the heat tubes 7 and 8 and is used as a heat source for heating, that is, as a heating fluid.

Therefore, since the heating fluid flowing into the unit body 1 side is water vapor, even if the heat source fluid is something that cannot be mixed with the absorption liquid, such as ethylene oxide or sulfuric acid, the thermal energy can be recovered without any problem. I can do it.

Effects of the Invention As described above, according to the configuration of the present invention, the heat source fluid is guided to a separate steam generator to generate steam, and this steam is guided as a heating fluid to the heat exchanger tubes of the evaporator and the regenerator. As a result, there is no risk of contact between the heat source fluid and the absorption liquid, and therefore any heat source fluid can be used as the heat source for the absorption heat pump, making it very economical.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic structure of an absorption heat pump according to an embodiment of the present invention, and FIG. 2 is a diagram showing a schematic structure of a conventional absorption heat pump. 2... Evaporator, 3... Absorber, 4... Regenerator, 5... Condenser, 7, 8... Heat exchanger tube, 11...
... Container body, 12 ... Heat exchanger tube, 13 ... Steam generator, 14 ... First transfer pipe, 16 ... Second transfer pipe.

Claims (1)

[Claims] 1. An absorption heat pump having an evaporator, an absorber, a regenerator, and a condenser, which is equipped with a steam generator that generates steam by heating with a heat source fluid, and uses the steam from the steam generator as a heating fluid to generate the evaporation. An absorption heat pump characterized in that the condensed water is guided to the heat exchanger tubes of the steam generator and the regenerator, and the condensed water is returned to the steam generator.