JPS59225266A - Multiple effect multistage 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 The present invention provides an I
This invention relates to a heat pump.

The temperature increase width of the heat generated by the absorption heat pump cannot be greater than the difference between the average % temperatures of the refrigerant and the absorption liquid at 1-pressure. In conventional heat pumps, for example, in the case of a combination of water and lithium bromide, the temperature increase range is 50°C, which is suitable for practical use. Therefore, in cases where it is desired to raise the temperature, combinations of media with a large equilibrium temperature difference have been studied, and a combination of water and lithium bromide with a multi-stage collector has been proposed. , thermal efficiency becomes very poor when multi-staged.

The present invention solves the above problems, and by making the regeneration process multi-effect, the amount of heat source used for regeneration can be significantly reduced, and the fluid to be heated can also be heated by refrigerant vapor in the condenser. The purpose of this invention is to provide a multi-effect, multi-stage absorption heat pump that selects the best system temperature and can effectively utilize the regenerative heat source, thereby making it possible to create a very efficient heating device as a whole.

That is, the present invention provides an evaporator that evaporates the refrigerant using a low-temperature external heat source in the evaporation and absorption process of the refrigerant, and an evaporator that evaporates the refrigerant using a low-temperature external heat source, and an evaporator that evaporates the refrigerant at a higher pressure by absorbing the generated refrigerant vapor f into an absorption liquid. It has a multi-stage absorption mechanism consisting of a plurality of absorbers that heat the heated fluid and an 8g absorber that heats the fluid to be heated.In the process of concentrating and regenerating the absorbent liquid and condensing the refrigerant, the absorbent liquid is concentrated using a high-temperature external heat source. It has a multiple effect mechanism consisting of a plurality of regenerators that repeatedly use the refrigerant vapor generated during condensation as a heat source for condensation, and a condensing unit that heats the fluid to be heated using the generated refrigerant vapor.

An embodiment of the present invention will be described below based on the drawings. As an example, the case of triple-effect three-stage absorption will be explained. In Figure 1, (E, ) (R2) (R5) are evaporation parts, (A, )
(A2XA5) is the absorption section, (R, 1 to 3 stage 1 collector, (7) (8) (9) are 1 to 3 effect regenerator,
+11 is a condenser, (at is a low-temperature external heat source fluid, (bl
is a high-temperature external heat source fluid, (cl is a heated fluid, (1) is a refrigerant, and (2) is an absorption liquid. ), the absorption part (A2
) and evaporator section (E, ), the second stage absorber (5) is connected to the absorption section (
A3) constitutes the third stage absorption section (6), and the regeneration section (R
7), the first effect regenerator (7), the condensation section (C1) and the regeneration section (R2), the second effect regeneration fti (8), and the condensation section (
C2) and the regenerator (R3) constitute a third effect regenerator (9).

The evaporator (3) uses a low-temperature external heat source fluid (a) to cool the refrigerant (
1) Evaporate. The first stage absorber (4) is the evaporator (3)
The refrigerant vapor generated in
2), and the newly generated higher temperature heat is used to evaporate the refrigerant (1 liter) in the evaporator section (R2) to obtain higher temperature and high pressure refrigerant vapor.Second stage 1 and collection (5) The refrigerant vapor at high temperature and pressure generated in the first stage absorber (4) is absorbed into the absorption liquid (2) in the first absorption section (A2), and the newly generated heat at the product temperature is used to absorb the refrigerant vapor at the evaporation section (R3). ) in refrigerant (1)
evaporates to obtain refrigerant vapor at a much higher temperature and pressure. 3rd stage absorption)? ! S (6) converts the refrigerant vapor generated in the second stage absorber (5) into an absorption liquid (2) in the absorption section (A5).
), and the newly generated high-temperature heat is used to heat the heated fluid (
Heat the cl.

On the other hand, the absorption liquid (2), which has become diluted by absorbing the refrigerant vapor, is sent to the first effect regenerator (7) through the entire heat exchanger αυ.

The first effect regenerator (7) concentrates the absorption liquid (2) using a high-temperature external heat source fluid (bl).The second effect regenerator sg (8
) condenses the refrigerant vapor generated in the first effect regenerator (7) in the condensing section (C4), and uses the newly generated heat to further condense the concentrated absorption liquid in the regeneration section (R2). The third effect regenerator (9) is the second effect regenerator! The refrigerant vapor generated in step (8) is condensed in the condensing section (C2), and the newly generated heat is used to further concentrate the concentrated absorption liquid in the regeneration section (R2). The condenser a1 heats the fluid to be heated (c) with the refrigerant vapor generated in the third effect regenerator (9).

Figure 2 shows the case where water and lithium bromide are used as the combination of refrigerant (1) and absorption liquid (2), and shows the case of triple-effect, three-stage absorption! An example is shown below. As can be seen from the figure, the temperature increase range can be increased, and high-temperature water or steam of 80 to 12 a''c can be generated using an abundant low-temperature environmental heat source such as river water of 20 to 30'C.

FIG. 3 shows another embodiment of the present invention.
What is different from the embodiment shown in the figure is that the absorbed liquid concentrated in the first effect regenerator (7) is transferred to the heat exchanger αυ, the first stage absorber (4),
2nd stage absorber (5), 3rd stage absorber (6), heat exchanger α
υ is a point at which the water flows in the order of the third effect regenerator (9), the second effect regenerator (8), and the first effect regenerator (7).

FIG. 4 shows an example of a cycle corresponding to the embodiment shown in FIG. 3, using water as the refrigerant and lithium bromide as the absorption liquid.
It is possible to generate high temperature water or steam of about 120°C using a low temperature environmental heat source of 0 to 30°C.

Note that although Figures 1 and 3 each show an example in which the number of heat exchangers is one for simplicity, in order to improve the efficiency of the system, the evaporator and the first to third stages are It may have a plurality of heat exchangers that exchange heat between the absorber, the condenser, and the refrigerant and absorption liquid at the outlets of the first to third effect regenerators. Further, although the heated fluid (cl) is configured to flow in parallel through the third stage absorber (6) and the condenser 01, it may be configured to flow in series.

As described above, according to the present invention, the amount of heat obtained from an external high-temperature fluid can be effectively applied to the heated fluid at an arbitrary temperature by using a multi-effect regenerator. Since heat can be used by raising the temperature using a multi-stage absorber, the device can heat and supply the fluid to be heated to a higher temperature range with a higher coefficient of performance than conventional heat pumps and other heating devices.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a diagram explaining an example of its cycle, Fig. 3 is a block diagram showing another embodiment of the present invention, and Fig. 4 is an example of its cycle. FIG. (υ... Refrigerant, (2)... Absorption liquid, (4) to (6)
...first to third stage absorbers, (7) to (9)...first
~Third effect regenerator, (a)...low temperature external heat source fluid,
(bl...high temperature external heat source fluid, (cl...heated fluid, (E,)(R2)(R3)...evaporation section, (A1
)(A2)(A3)...Absorption part, (R1)(R2)(
R3)...Reproducing section, (C,) (c2) (c5)...
Condensation Department Agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. In the refrigerant evaporation and absorption process, there is evaporation DG, in which the refrigerant is evaporated using a low-temperature external heat source, and multiple absorption processes, in which the generated refrigerant vapor is absorbed into an absorption liquid and the generated heat is used to evaporate the refrigerant at a higher pressure. It has a multi-stage absorption mechanism consisting of an absorber and an absorber that heats the fluid to be heated.In the process of concentrating and regenerating the absorbent liquid and condensing the refrigerant, it uses a high-temperature external heat source to concentrate the absorbent liquid, and also reduces the amount of water generated during agricultural contraction. It is characterized by having a multi-effect mechanism consisting of a solitary regenerator that repeatedly uses the refrigerant vapor as a heat source, and a condenser that heats the fluid to be heated by the generated refrigerant vapor. Multi-effect multi-stage absorption heat pump