JPS58219370A - Absorption type refrigerator - 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 relates to a hot water utilization-type dynamic absorption chiller, which has a plurality of independent absorption solution cycles, particularly suitable for heat exchange between hot water and regenerator solution, and which converts hot water to low temperature. This article relates to an absorption chiller that can be used up to

Conventional hot water utilization type dynamic absorption refrigerators have a single absorption solution cycle, and therefore a single regenerator. And at the temperature level of the conventional absorption solution cycle, even if there is a sufficient temperature difference between the temperature of the regenerator outlet solution and the hot water inlet temperature for heat exchange between the two, the saturation temperature of the regenerator inlet solution and the hot water inlet temperature Regarding the temperature difference between the outlet temperature and the outlet temperature, the former is not sufficient and has the disadvantage that sufficient heat utilization to reach the low temperature of hot water is not possible.

The purpose of the present invention is to provide a hot water utilization type dynamic absorption chiller with a plurality of absorption solution cycles in one unit, so that the inlet temperature of each regenerator can be changed in stages, so that even if the hot water temperature drops, the solution An object of the present invention is to provide an absorption chiller with a high heat utilization rate for waste hot water, etc., which can regenerate waste water.

Hot water utilization: In heavy-effect absorption chillers, from the perspective of energy conservation, the most important issue is how to utilize as wide a temperature range of hot water as possible and how to perform effective heat exchange to regenerate the solution.

Furthermore, increasing the hot water inlet temperature increases the temperature difference with the solution, which is advantageous in terms of heat exchange, but the regenerator pressure also increases accordingly, so a certain upper limit can be considered.

Here, the hot water inlet temperature depends on the hot water outlet temperature, and the hot water outlet temperature is determined by the solution regeneration inlet temperature. If the solution regeneration inlet temperature is lowered, the temperature difference between the hot water outlet temperature and the hot water outlet temperature increases, so that effective heat exchange for solution regeneration becomes possible without changing the hot water inlet/outlet temperature. Therefore, it is necessary to lower the temperature at the regeneration packing inlet, but in order to lower the temperature at the regeneration packing inlet of the solution, it is necessary to reduce the concentration of solution entering the regenerator = concentration of solution exiting the absorber. Here, the absorber outlet solution concentration is determined by the average temperature of the absorber's cooling water, so absorption refrigeration has multiple independent absorption solution cycles that use cooling water at a temperature midway between the absorber's inlet and outlet. By using this method, it is possible to obtain a solution that is thinner than the conventional absorber outlet solution, and it becomes possible to obtain a regeneration filling inlet temperature lower than that of the conventional absorber.

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. As an example, a hot water type dynamic absorption refrigerating machine having two independent absorption solution cycles will be described.

The type 1 dynamic absorption chiller of this embodiment includes a first condenser 1, a second condenser 5, a second regenerator 2, a second regenerator 6, a first evaporator 3, a second evaporator 7, It consists of a first absorber 4 and a second absorber 8, and the refrigerant sprayed onto the heat transfer tubes of the first evaporator 3 or the second evaporator 7 by the refrigerant pump 23 absorbs the latent heat of evaporation from the cold water 19 and cools the refrigerant. It becomes steam 24. On the other hand, the concentrated solution sprayed onto the heat exchanger tubes of the first absorber 4 or the second absorber 8 by the solution spray 21 is cooled by the cooling water 17 passing inside the heat exchanger tubes, and at the same time lowers the water vapor partial pressure.
It absorbs the refrigerant vapor 24 from the first evaporator 3 or the second evaporator 7 and becomes a dilute solution. The dilute solution is passed through the heat exchanger 9 or heat exchanger 10 by the solution pump 22, and is then transferred to the
It is sent to the regenerator 2 or the second regenerator 6. No.-Regenerator 2
Alternatively, the dilute solution sent to the second regenerator 6 is heated by the hot water 18 and generates refrigerant vapor 25, respectively. The refrigerant vapor 25 is cooled by the cooling water 17 in the first condenser 1 or the second condenser 5, and is condensed to become a refrigerant liquid. It is returned to the second evaporator 7. In the first regenerator 2 or the second regenerator 6, the solution that has become concentrated by generating refrigerant vapor 25 is transferred to the heat exchanger 9 or the heat exchanger 10 through the concentrated solution return pipe 13 or the concentrated solution return pipe 14. It is then returned to the first absorber 4 or the second absorber 8 and sprayed onto the heat exchanger tubes again.

As shown in the figure, the cooling water 7 is passed through the first absorber 4, the first condenser 1, the second condenser 5, and the second absorber 8 in this order, and the hot water 1
8, the water is passed through the second regenerator 6 and the second regenerator 2 in that order, and the cold water 1
9, water is passed through the first evaporator 3 and the second evaporator 7 in that order.

This example is illustrated in a solution cycle diagram as shown in FIG. 3. Here, point A is the regeneration inlet, point B is the regeneration amount outlet, point 0 is the inlet of the first absorber, point D is the outlet of the first absorber,
Point E corresponds to the inlet of the second absorber, point F corresponds to the outlet of the second absorber, point G corresponds to the inlet of the second absorber, and point H corresponds to the outlet of the second absorber. A/ B/ C/ also shown by dotted lines in Figure 3
The :o/ cycle diagram shows a conventional cycle.

As can be seen, the temperature at point A, which is the regeneration entry port in the solution cycle of this embodiment, is lower than that at point A', which is the regeneration entry port in the conventional solution cycle, by Δ[. On the other hand, since the temperature at point F, which is the outlet of the second regenerator, is higher than that of point B', which is the outlet of the conventional regenerated amount, it is considered that the amount of heat exchanged between the hot water and the regenerator solution is approximately equal. However, in conventional refrigerators, even if the heat transfer area on the solution inlet side of the regenerator is expanded, the temperature difference between the hot water and the solution becomes smaller, and the heat recovery effect cannot be expected. Since the regenerator solution inlet temperature of the refrigerator of this embodiment is lower than that of the conventional one, by expanding the heat transfer area on the solution inlet side of the first regenerator, heat utilization up to a low temperature of hot water can be effectively performed. be able to.

In the above example, the absorber, evaporator, regenerator, and condenser are
Although the explanation has been given on the case of division, the present invention is not limited to this, and it goes without saying that similar actions and effects can be obtained even when the division is divided into three or more.

As described above, according to the present invention, the solution concentration at the inlet of the regenerator can be lowered from the conventional level, and at the same time, the solution temperature can be lowered. This makes it possible to utilize heat, making it extremely effective in terms of energy conservation. In addition, by adjusting the circulation amount for each of a plurality of independent absorption solution cycles, the temperature at the regenerator inlet can be adjusted, so that a flow rate matching the hot water temperature can be formed. Economically, since it has multiple independent absorption solution cycles, using a single refrigerator is somewhat complicated, and the cost increases due to the need for more solution pumps and an increased heat transfer area, but waste hot water is used for hot water. In this case, heat can be effectively utilized down to low temperatures, increasing refrigeration capacity and being very effective in terms of running costs.

[Brief explanation of drawings]

Figure 1 is a cycle 70 diagram of a hot water utilization type dynamic absorption chiller having multiple absorption solution cycles, and Figure 2 is a cycle flow diagram of a hot water utilization type dynamic absorption chiller having two absorption solution cycles. FIG. 3 is a solution cycle diagram of the above-mentioned absorption refrigerator. 1... First condenser, 2... Second regenerator, 3... First evaporator, 4... First absorber, 5... Second condenser,
6... Second regenerator, 7... Second evaporator, 8... Second absorber, 9... Heat exchanger, 10... Heat exchanger, 1
1... Dilute solution line, 12... Dilute solution line, 13
...Concentrated solution return piping, 14...Concentrated solution return piping, 1
5... Refrigerant return piping, 16... Refrigerant return piping, 17
...Cooling water, 18...Hot water, 19...Cold water, 20
... Refrigerant spray, 21 ... Solution spray, 22.
... solution pump, 23 ... refrigerant pump, 24 ... refrigerant vapor, 25 ... refrigerant vapor, 26 ... first condenser,
27... Second condenser, 28... (n-1)th condenser, 29... Nth condenser, 30... Te first regenerator, 31
...Second regenerator, 32...Nth (n21) regenerator, 3
3... nth regenerator, 34... first evaporator, 35...
- Second evaporator, 36... No. (II-1) evaporator, 37
...nth evaporator, 38...first absorber, 39...
Second absorber, 40...(n-1)th absorber, 41...
- nth absorber, 42... heat exchanger, 43... heat exchanger, 44... solution pump, 46... cooling water, 47...
...Hot water, 48...Cold water, A...No.-Regenerator inlet,
B: Outlet of the second regenerator, C... Inlet of the first absorber, D
...First absorber outlet, E...Second absorber inlet, F.
...Second absorber outlet, G...Second absorber inlet, H...
・Second absorber outlet, A'...Regenerator inlet, B'...
Regenerator outlet, C'...absorber inlet, D'...suction
1 concave A

Claims (1)

[Claims] 1. A single-effect absorption refrigerator comprising a condenser, a regenerator, an evaporator, an absorber, a heat exchanger, and a solution pump,
The condenser, regenerator, evaporator, absorber, and heat exchanger are divided into any number of sets via partition walls, and each set forms an independent absorption solution cycle, and the chilled water is divided into any number of sets. Water is sequentially passed through the evaporator, and the cooled water is passed through the absorber corresponding to the category with the highest chilled water temperature, and then flows into the condenser that forms an absorption solution cycle with the evaporator and absorber. An absorption refrigerating machine characterized by flowing in the order of condenser and absorber corresponding to the second highest temperature category. 2 After passing the lowest temperature cooling water through the absorber corresponding to the lowest chilled water temperature category, the water is passed through the condenser that forms an absorption solution cycle with these, and then to the next lowest chilled water temperature category. a corresponding condenser forming an absorption solution cycle;
2. The absorption refrigerator according to claim 1, wherein water is passed through the absorber in order.