JPH01134173A - Absorption heat pump device - Google Patents

Abstract

PURPOSE: To obtain fluid to be heated having a higher temperature level than a conventional one from the absorber of a second absorption heat pump by a structure wherein cooling water is fed from the condenser of the second absorption heat pump to that of the first absorption heat pump. CONSTITUTION: A pipe 36 on the cooling water outlet side of the condenser C2 for a second absorption heat pump 2 is coupled through a pipe 41 with a pipe 29 on the cooling water inlet side of the condenser C1 for a first absorption heat pump 1. Consequently, saturation temperature and steam pressure in the condenser C1 are higher than those of the condenser C2 and the suction fluid in the generator G2 of the second absorption heat pump 2 is concentrated more than,that in the generator G1 of the first absorption heat pump. When saturation steam pressure and temperature in the evaporator E2 and absorber A2 of a following heat pump are set equal to those of a conventional one, fluid to be heated having a higher temperature level than a conventional one can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to an improvement in an absorption heat pump device that pumps up the heat of a low-temperature fluid to obtain a heated fluid having a higher temperature than the low-temperature fluid.

(B) Conventional technology As the conventional technology of the above-mentioned absorption heat pump device, the refrigerant and the absorber are heated so that the heated fluid whose temperature is raised by the heat generated when the absorption liquid absorbs the refrigerant is obtained from the absorber. A plurality of absorption heat pumps that form a liquid circulation cycle are installed with each refrigerant and absorption liquid circulation cycle independent, and the heat of the heated fluid obtained from the absorber of one absorption heat pump is used to generate the following an absorption heat pump in which an absorber of one absorption heat pump and an evaporator of the next absorption heat pump are thermally connected such that the refrigerant in the evaporator of the absorption heat pump is evaporated at a higher temperature level than that of the absorption heat pump; An absorption heat pump device (for example, Japanese Patent Laid-Open No. 61-125
(Refer to Publication No. 559).

(c) Problems to be solved by the invention In the conventional absorption heat pump device described above, the condenser of one absorption heat pump [hereinafter referred to as the first absorption heat pump] is connected to the next absorption heat pump [hereinafter referred to as the second absorption heat pump]. Since the structure is such that the cooling water flows to that of the first and second absorption heat pumps, if the same type of refrigerant-absorbent is used in the first and second absorption heat pumps and the heat source fluid of the same temperature level is supplied to these generators, the second The concentration rate of the absorption liquid in the generator of the absorption heat pump is lower than that in the first absorption heat pump, and the problem is that the saturation temperature and saturated vapor pressure of the evaporator of the second absorption heat pump must be increased accordingly. there were.

In view of this problem, the present invention lowers the saturation temperature and saturated vapor pressure of the evaporator of the second absorption heat pump than the conventional one, and supplies the fluid to be heated at the same temperature level to the second absorption heat pump. The object of the present invention is to provide an absorption heat pump device that can be obtained from an absorber.

(d) Means for solving the problems As a means for solving the above problems, the present invention comprises an absorption heat pump device in which cooling water flows from the condenser of the second absorption heat pump to that of the first absorption heat pump. It is something.

(*) Effect In the absorption heat pump device of the present invention, the saturation temperature and saturated vapor pressure in the condenser of the second absorption heat pump are lower than those in the condenser of the first absorption heat pump, and the generator of the second absorption heat pump It has the effect of increasing the concentration rate of the absorption liquid in the first absorption heat pump compared to that in the generator of the first absorption heat pump. The heated fluid having the same temperature level as the heat pump device can be taken out from the absorber of the second absorption heat pump.

(f) Embodiment Figure 1 is a schematic configuration explanatory diagram showing an absorption heat pump device as an embodiment of the present invention. (1) is a first absorption heat pump, and (2) is a second absorption heat pump. . (
Gl), (ct), (El), (At) and (H8> are the generator, condenser, evaporator, absorber and solution heat exchanger of the first absorption heat pump, (pcm),
(PI3) and (pat) are pumps for refrigerant liquid, refrigerant liquid circulation, and absorption liquid, respectively, and these devices include ducts (3) and (4) through which refrigerant vapor flows, and pipes (5) through which refrigerant liquid is sent. ), (6), refrigerant liquid reflux pipe (
7), (8), Pipe to which the absorption liquid is sent (9), <
10), (11) and the pipe through which the absorption liquid flows (12)
, (13) to form a refrigerant and absorption liquid circulation cycle. Note that (14) is a heat exchange fill of the solution heat exchanger (Hl).

In addition, (G), (ct), (E), (A) and (H8) are the generator and condenser of the second absorption heat pump,
In the evaporator, absorber and solution heat exchanger,
(put> and (pat>) are pumps for refrigerant liquid, refrigerant liquid circulation, and absorption liquid, respectively, and these devices include ducts (15) and (16) through which refrigerant vapor flows, and pipes (17 ) , (18), the refrigerant liquid reflux pipe (19> , (20), the absorption liquid pipe (
A circulation cycle of the refrigerant and absorption liquid of the first absorption heat pump (1) connected by 21), (22), (23) and the pipes (24) and (25) through which the absorption liquid flows (hereinafter referred to as the first circulation cycle). A refrigerant and absorption liquid circulation cycle (hereinafter referred to as a second circulation cycle) independent from the first circulation cycle is formed. Furthermore, (26) is a heat exchange coil of the solution heat exchanger (H2).

(Ql), (R1>, (x+) and (Yl)
are the generators (G, G,
), condenser (CI), evaporator (El) and absorber (A
(ox>, (Rt), (X,) and (Y,) are the generators of the second absorption heat pump (2), respectively. (G,), a condenser (C8), an evaporator (E,), and an absorber <A,) include a built-in heater, cooler, heat supply device, and heated device.

In addition, (27) and (28) are pipes connected to the heater (Q,) through which low-temperature heat source fluids such as waste steam and waste hot water flow;
(29) and (30) are pipes connected to the cooler (R1) through which cooling fluid such as cooling water or cooling air flows; (31)
, (32) is a pipe through which heat source fluid flows, connected to the heat supply device (X
Pipe through which heat source fluid flows connected to C, (35), (3
6) is a pipe through which cooling fluid flows, connected to the cooler (R), and (37) and (38) are the heated devices (Y,
) and the heat supply device (X,), and the pipe (37) is equipped with a pump (P) that circulates the fluid to be heated. Further, (39) and (40) are pipes connected to the heated device (Y,), and the fluid to be heated is supplied from the pipe (40) to the load (not shown) side. And condenser (C2
The pipe (36) on the cooling water outlet side of ) and the pipe (29>) on the cooling water inlet side of the condenser (C1) are connected by a pipe (41).

Next, an example of the operation of the absorption heat pump device (hereinafter referred to as the present device) configured as described above will be briefly described.

While flowing cooling water to the cooler (R1) of the first absorption heat pump (1), waste steam is supplied to the heater (Ql) and heat supply device (X,), and water is circulated to the heated device (Y,). By this, the first circulatory cycle is formed, and the absorber (AI
), the heat generated when the absorption liquid absorbs the refrigerant vapor from the evaporator (E,) (hereinafter referred to as the first absorption heat) causes the water circulating in the heated device (y+) to rise to a temperature higher than that of the waste steam. The temperature is raised to This heated water is transferred to the second absorption heat pump (2
) and the waste steam is supplied to the heater (X, ) of the heater (
A second circulation cycle can be completed by supplying water to the heated device (Y!) while supplying the water to the heated device (Y!) while flowing the cooling water to the cooler (R1). The heated device (Y
, ) is heated to a temperature higher than the temperature of the water flowing through the heated device (y+) and is supplied to the load side.

Figure 2 shows an example of the Dueling diagram for the water (refrigerant) and lithium bromide aqueous solution (absorbing liquid) system in an example of the operation of this device.
The cycle represents the first circulation cycle, a□→b, →
The cycles C1→d,→a represent the second circulation cycle. In the case of this figure, waste steam from the same waste steam source is supplied to the heaters (Q,), (Q,) and the heat supplier (X,), respectively, and the same cooling water source The cooling water from the cooler is sequentially flowed in series from cooler (R1) to cooler (R1).

In the cycle shown in Figure 2, approximately 28° from the cooling water source
An example is shown in which high-temperature water of about 141°C is obtained from the absorber (A) of the second absorption heat pump (2) of this device using the cooling water of C and waste steam of about 79°C from the waste heat source. In this example, the concentration of the dilute absorption liquid of the first absorption heat pump (1) is approximately 52%, and the concentration of the concentrated absorption liquid is approximately 56%.
, the concentration of the dilute absorption liquid of the second absorption heat pump (2) is approximately 55
%, its concentrated absorption liquid concentration is about 59%, condenser (C+),
The saturation temperature of (CZ) is approximately 40°C and approximately 36°C, respectively.
The saturation temperatures of the evaporator (El) and ff:*> are approximately 76°C and 98°C, respectively.

Figure 3 shows an example of a Dueling diagram when the device is operated with the cooling water flowing from the cooler (R1) to the cooler (R1) and other conditions being the same as in a conventional absorption heat pump device. ing. In this example, the concentration of the dilute absorption liquid in the first absorption heat pump is approximately 55%, the concentration of the concentrated absorption liquid is approximately 59%, the concentration of the dilute absorption liquid in the second absorption heat pump is approximately 53%, and the concentration of the concentrated absorption liquid is approximately 59%. Approximately 57%, 1st. Second
The saturation temperature of each condenser of an absorption heat pump is approximately 3
6℃, about 40℃, and the first. The saturation temperature of each evaporator of the second absorption heat pump is about 76°C and about 103°C, and the temperature from the absorber of the second absorption heat pump is about 141°C.
of high-temperature water can be obtained.

As is clear from comparing the cycle example in Figure 2 with that in Figure 3, the saturation temperature of the evaporator of the second absorption heat pump in the former is approximately 98°C, and its vapor pressure is atmospheric pressure. It can be seen that the saturation temperature in the latter case is about 103°C and the vapor pressure exceeds atmospheric pressure. In other words, when taking out high-temperature water at the same temperature level from the second absorption heat pump, it is better to have a structure in which the cooling water flows from the condenser of the second absorption heat pump to that in the first absorption heat pump than to have a structure in which it flows in the opposite direction. This makes it possible to lower the saturation temperature and saturated vapor pressure of the evaporator and absorber of the second absorption heat pump.

Although not shown in the figure, if low-temperature cooling water such as well water is obtained, this device may be configured with three or more absorption heat pumps, and the absorber of the first absorption heat pump (
The temperature of the fluid to be heated may be increased sequentially from AI) to the absorber (A,), and the highest temperature fluid to be heated may be taken out from the absorber of the n-th absorption heat pump. In this case, by flowing cooling water in series from the condenser (Cn) of the n-th absorption heat pump to the condenser (CI) of the first absorption heat pump, the internal pressure of the n-th absorption heat pump is increased. It is also possible to operate this device while keeping the pressure below atmospheric pressure. On the other hand, if the cooling water flows in the opposite direction, the internal pressure of the n-th absorption heat pump tends to be much higher than atmospheric pressure, so the device needs to be of pressure-resistant construction.
It has the disadvantage of increasing costs.

(G) Effects of the Invention As described above, the present invention provides a plurality of absorption heat pumps in which circulation cycles of refrigerant and absorption liquid are formed independently, and an absorber of one absorption heat pump and an absorber of the next absorption heat pump are provided. In an absorption heat pump device that sequentially heats the heated fluid by thermally connecting the evaporator of the heat pump, the cooling water inlet side of the condenser of one absorption heat pump and the cooling water outlet side of the condenser of the next absorption heat pump. Compared to a conventional device that connects the cooling water outlet side of the condenser of one absorption heat pump to the cooling water inlet side of the next absorption heat pump, It has the effect of increasing the concentration of the concentrated absorption liquid, and has the effect of keeping the saturation temperature and saturated vapor pressure of the evaporator and absorber of the next absorption heat pump low when taking out the heated fluid at the same temperature level as conventional equipment. has. In other words, if the saturated vapor pressure and saturation temperature of the evaporator and absorber of the next absorption heat pump are the same as those of the conventional device,
There is an advantage that the fluid to be heated can be taken out from the apparatus of the present invention at a higher temperature level than in the conventional apparatus.

[Brief explanation of the drawing]

Fig. 1 is a schematic structural explanatory diagram showing an absorption heat pump device as an embodiment of the present invention, Fig. 2 is a Dueling diagram showing an example of an absorption heat pump cycle of the device of the present invention, and Fig. 3 is a diagram showing a conventional absorption heat pump cycle. It is a Duering diagram showing an example of a cycle of a heat pump device. (1)...First absorption heat pump, (2)...Second absorption heat pump, (AI), (At)...
Absorber, (CI>. (C2)... Condenser, (El), (Et)...
Evaporator, (G,). (Gri...generator, (P)...pump, (Q,
), (Qc...heater, (R1), (1...
Cooler, (yt), (yt)... heated device,
(29), (30), (35), (36)
, (37), (38), (41)...tube.

Claims (1)

[Claims] (1) An absorption heat pump that forms a circulation cycle for the refrigerant and absorption liquid so that the heated fluid whose temperature is raised by the heat generated when the absorption liquid absorbs the refrigerant is obtained from the absorber A plurality of units are installed with independent circulation cycles, and the heat of the heated fluid obtained from the absorber of one absorption heat pump makes the refrigerant in the evaporator of the next absorption heat pump higher than that of the one absorption heat pump. In an absorption heat pump device configured such that an absorber of an absorption heat pump that evaporates at a high temperature level and an evaporator of the next absorption heat pump are thermally connected to sequentially raise the temperature of the fluid to be heated, An absorption heat pump device characterized in that the cooling water inlet side of the condenser of the next absorption heat pump and the cooling water outlet side of the condenser of the next absorption heat pump are connected by a cooling water flow path.