JPS6314293Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a refrigerant generator used in an absorption refrigerator, an absorption heat pump, an absorption chiller/heater, etc., and particularly relates to a heat source for separating a refrigerant from an absorption liquid. This invention relates to a refrigerant generator that uses the heat of condensation of steam (hereinafter referred to as this type of refrigerant generator).

(b) Prior art Conventionally, in this type of refrigerant generator, a group of heat transfer tubes to which steam is supplied are arranged horizontally at the bottom of the vessel body, and the bottom wall of the vessel body is also horizontal. It has been known.

In such conventional refrigerant generators, since the heat transfer tubes are horizontal, condensate generated by steam condensation tends to accumulate in the tubes, and heat transfer is particularly difficult when the inner diameter of the tubes is small. The inside of the pipe is easily blocked by drain. As a result, steam is not smoothly supplied to the heat exchanger tubes, and the heat transferred to the absorption liquid through the heat exchanger tubes decreases, deteriorating the performance of the refrigerant generator.

In addition, in this type of refrigerant generator, usually
A large number of support plates are provided to support the heat exchanger tube group in order to prevent the heat exchanger tubes from bending. Since the absorption liquid flowing inside the refrigerant generator body is subjected to resistance from these support plates, the flow of the absorption liquid becomes poor. In particular, in the case of a highly viscous absorbing liquid such as a lithium bromide aqueous solution or a lithium chloride aqueous solution, the flow becomes even worse. Therefore, if the bottom wall of the container body is horizontal as in conventional refrigerant generators, the absorption liquid will remain in the container body, resulting in a disadvantage that the absorption liquid will be unevenly distributed in the refrigerant generator.

(C) Purpose The purpose of the present invention is to provide a refrigerant generator in which the flow of the absorbing liquid is good and the heat exchange between the absorbing liquid and the steam on the heat source side is also good.

(d) Structure of the invention The present invention tilts the heat exchanger tube group disposed at the bottom of the refrigerant generator so that the steam inlet side is higher and the drain outlet side is lower, and The bottom wall of the refrigerant generator is configured to be inclined so that the upstream side of the absorption liquid is high and the downstream side is low.

According to the present invention, the condensate inside the heat exchanger tube flows down along the slope of the tube and prevents the condensate from clogging the inside of the tube, so that steam flows smoothly into the heat exchanger tube, and the steam inside the tube and Good heat exchange with the outside absorption liquid is maintained. Moreover, according to the present invention, since the absorbent liquid flows down along the slope of the bottom wall of the refrigerant generator, the flow of the absorbent liquid is also good, and stagnation of the absorbent liquid in the vessel is also prevented.

In other words, in absorption refrigerators and absorption heat pumps using the refrigerant generator of the present invention, uneven distribution of the absorption liquid in the refrigerant generator and deterioration of heat exchange between the steam inside the heat transfer tube and the absorption liquid outside the tube can be prevented. Therefore, the performance of absorption refrigerators and absorption heat pumps can be maintained at a good level.

(E) Embodiment FIG. 1 is a schematic explanatory diagram showing an embodiment of the refrigerant generator of the present invention. The embodiment shown in FIG. 1 will be described below. Reference numeral 1 denotes a horizontally elongated cylindrical vessel body, and a group of heat transfer tubes 2 is disposed at the bottom of this vessel body. 3 and 4 are steam headers and drain headers provided on both sides of the vessel body 1, and the ends of the heat exchanger tube group 2 are surrounded by these headers. And heat exchanger tube group 2
is supplied with refrigerant steam from a high temperature generator (not shown) or steam from a boiler (not shown) through a steam header 3.
Further, the heat exchanger tube group 2 is inclined such that the steam header 3 side, that is, the upstream side of the tubes is higher and the drain header 4 side, that is, the downstream side of the tubes is lower. Reference numeral 5 indicates an inlet for absorbing liquid provided on the upper wall of the vessel body 1 on the side of the steam header 3, and numeral 6 indicates an outlet for absorbing liquid provided on the side wall of the vessel body 1 on the side of the drain header 4. Also,
This outlet 6 is provided above the uppermost heat exchanger tube. The bottom wall 7 of the container body 1 is inclined such that the inlet 5 side, that is, the upstream side of the absorption liquid is higher and the outlet 6 side, that is, the downstream side of the absorption liquid, is lower. Note that 8 is an outlet for refrigerant vapor separated in the refrigerant generator. Furthermore, although not shown, the heat exchanger tube group 2 is provided with a large number of support plates.

Next, the operation of the refrigerant generator configured in this way will be explained. Heat exchanger tube group 2 through steam header 3
The steam flowing into the tube exchanges heat with the absorption liquid outside the tube to separate refrigerant vapor from the absorption liquid, which itself condenses and becomes drain. The condensed drain flows down the bottom of the tube along the slope of the tube and is discharged into the drain header 4. That is, since the condensate flows down from a high place to a low place along the inclination of the heat transfer tube and is discharged outside the tube, there is almost no possibility that the condensate stays inside the tube or that the inside of the tube becomes clogged with condensate.

In this way, accumulation of condensate inside the tubes and blockage due to condensate inside the tubes are prevented, so steam is smoothly supplied to the heat transfer tube group 2, and the exchange between steam inside the tubes and absorption liquid outside the tubes is prevented. The heat exchange area is also kept large. As a result, heat exchange between the steam inside the heat transfer tube and the absorption liquid outside the heat transfer tube is performed well, and the refrigerant separation function of the refrigerant generator is maintained well.

On the other hand, the absorption liquid that has flowed into the container body 1 of the refrigerant generator from the absorption liquid inlet 5 flows down from a high place to a low place along the slope of the bottom wall 7 of the container body 1 and is discharged to the outlet port 6. be done. In other words, the flow of the absorption liquid in the container body 1 is promoted by the difference in height, so factors that inhibit the flow, such as the support plate of the heat transfer tube group 2, fins formed on the outer surface of the heat transfer tubes, or the viscosity of the absorption liquid, Even if there is
Compared to conventional refrigerant generators in which the bottom wall of the container body is horizontal, the flow of the absorption liquid is improved and it is possible to prevent liquid stagnation and clogging in the container.

In this way, the flow of the absorption liquid is promoted, so
The amount of heat transferred to the absorption liquid filling the heat transfer tube group 2 also increases, and the refrigerant separation function of the refrigerant generator improves.

In addition, when a conventional refrigerant generator is used as the low temperature generator of a dual-effect absorption refrigerator, the absorption liquid remains in the container and is heated only by natural convection, which has low thermal efficiency. be. On the other hand,
When the refrigerant generator of the present invention is used as a low-temperature generator, the flow of the absorption liquid in the container body 1 is promoted.
The absorption liquid has the advantage of being efficiently heated.

Note that the inclination angle of the bottom wall 7 of the container body 1 is preferably set to several degrees to more than ten degrees so that the heat exchanger tube group 2 can be filled with the absorption liquid. The inclination angle of the heat transfer tube group 2 is also adjusted so that the condensate can flow down the bottom of the tubes.
It is preferable to set it to several degrees to more than ten degrees.

FIG. 2 is a schematic diagram showing another embodiment of the refrigerant generator of the present invention. In FIG. 2, components similar to those shown in FIG. 1 are given the same reference numbers. In the embodiment of FIG. 2, a refrigerant generator body 1 is placed on a lower body 9 consisting of an evaporator and an absorber.
This is an example where the device is installed at an angle. In this way, it is possible to incline the heat transfer tube group 2 and the bottom wall 7 of the container body 1 using a conventional refrigerant generator.

(f) Effects of the invention As described above, the present invention tilts the bottom wall of the heat exchanger tube group and the vessel body of this type of refrigerant generator to increase the absorption liquid in the vessel body and the drain in the heat exchanger tubes. Since the absorbent liquid is made to flow down from a high place to a low place, it is possible to prevent the absorption liquid from stagnation in the vessel body, and also to prevent blockage due to drain in the heat transfer tubes. Therefore, in the refrigerant generator of the present invention, the absorption liquid is heated while the steam is smoothly supplied into the heat transfer tube, and the refrigerant separation function in this type of refrigerant generator is maintained well. In addition, since the absorption liquid is prevented from accumulating in the vessel body and filling the upper part of the vessel body where the heat transfer tube group is not provided, it is possible to prevent the absorption liquid from being insufficiently heated. It also becomes possible to downsize.

In addition, absorption refrigerators using the refrigerant generator of the present invention,
In absorption heat pumps and absorption chiller-heating machines, uneven distribution of the absorption liquid in the refrigerant generator is prevented, so for example, overflow of the absorption liquid from the refrigerant generator to the condenser,
Cavitation of the solution pump provided at the bottom of the absorber can also be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic structural explanatory diagram showing one embodiment of the refrigerant generator of the present invention, and FIG. 2 is a schematic explanatory diagram showing another embodiment of the refrigerant generator of the present invention. 1... Container body, 2... Heat transfer tube group, 3... Steam header, 4... Drain header, 5... Inlet, 6
... Outlet, 7... Bottom wall.

Claims (1)

[Scope of utility model registration request] A group of heat exchanger tubes to which steam is supplied is arranged at the bottom of the vessel body, and the heat exchanger tube group is inclined so that the upstream side is high and the downstream side is low, and the vessel body is arranged so as to surround the ends of the heat exchanger tube group. A steam header and a drain header are provided on both sides, and an inlet for the absorption liquid is provided at the top of the body on the steam header side, and an outlet for the absorption liquid is provided at the bottom of the body on the drain header side, so that the upstream side of the absorption liquid is high and the downstream side is high. A refrigerant generator characterized in that the bottom wall of the container body is sloped so as to be lower.