JPH0718617B2 - Direct-fired generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an absorption refrigeration system of a type in which a combustion gas passage is horizontally arranged in a vessel and a solution pipe group is vertically arranged in the passage. Machine (for absorption heat pump device, absorption chiller / heater)
The present invention relates to an improvement in a direct-fired generator.

(B) Prior art In the above-mentioned direct-fired generator, the heat exchange between the liquid in the solution pipe arranged on the central side of the combustion gas passage and the combustion gas is good, but the inner walls on both sides of the passage are good. The heat exchange between the liquid in the solution pipe arranged near and the combustion gas tends to be bad. The reason is that the hot gas flowing near both sides of the combustion gas passage easily moves along the inner wall of the passage,
It is possible that the solution in the solution tube group arranged in the vicinity thereof is not sufficiently heat-exchanged and is discharged to the outside of the device at a high temperature.

Therefore, as a conventional technique for reducing the above-mentioned tendency of the above-mentioned type of the direct-fired generator, for example, in Japanese Utility Model Laid-Open No. 58-24
As seen in Japanese Patent No. 649, a furnace cylinder (combustion gas passage)
There are baffles provided on both inner walls of the baffle, and the surface on the upstream side of the baffle is inclined in the downstream direction of the combustion gas.

(C) Problems to be Solved by the Invention In the above-described conventional direct-fired generator, the baffle causes the combustion gas that easily flows at the high temperature along the inner walls of both sides of the furnace tube to be in the vicinity of both inner walls of the furnace tube. The baffle itself does not have the function of exchanging heat between the liquid and the gas, and even the heat exchange area between the liquid and the gas is introduced. There is a problem in that the space cannot be increased and a space for providing the baffle is required.

The present invention has been made in view of these problems, and an object thereof is to provide a direct-fired generator capable of increasing the amount of heat exchange between the liquid and the combustion gas as the entire generator as compared with the conventional one. .

(D) Means for Solving Problems As a means for solving the above problems, the present invention provides a solution tube group provided in the vicinity of both inner walls of a combustion gas passage in a direct-fired generator of the type described above. For example, by means such as narrowing the arrangement interval of the tube groups, the solution tube groups arranged in other portions of the combustion gas passage are arranged more densely.

(E) Action In the direct-fired generator of the present invention, since the heat exchange area in the vicinity of both inner walls of the combustion gas passage is larger than that of the other portions of the combustion gas passage, any portion of the passage is formed. Further, as compared with the conventional one in which the solution tube groups are arranged at almost the same density, it is possible to exert the function of increasing the heat exchange amount between the liquid and the gas in the vicinity of both sides of the passage. Moreover, the tube group itself also exerts a function as a baffle by densely arranging the tube group in the vicinity of both inner walls of the passage. Therefore, the effect of promoting heat exchange between the liquid and the gas near both sides of the passage is brought about. Then, the heat exchange amount of the generator as a whole increases.

(F) Example FIG. 1 is a longitudinal sectional view of an example of a direct-fired generator for an absorption refrigerator according to the present invention, and FIGS. 2 and 3 are the examples shown in FIG. 1, respectively. II-II, a cross-sectional view taken along the line II of FIG.
It is a plane sectional view of a line arrow. In these figures,
(1) is a body of a direct-fired generator for an absorption refrigerator, which has a solution storage section (2) and a vapor separation section (3) surrounded by an inner wall and an outer wall. Reference numeral (4) is a furnace tube formed by a part of the inner wall of the case body (1), and a smoke chamber (5) for reversing combustion gas is similarly formed on the downstream side thereof. Reference numeral (6) is a combustion gas passage horizontally arranged in the vessel so as to be located above the furnace tube (4). The upstream end of the passage is connected to the smoke chamber (5) while the downstream end is exhaust gas smoke. It communicates with the room (7). (8) is a chimney connected to the upper wall of the exhaust gas smoke chamber (7).

(9a), (9b) ... are solution tubes vertically arranged in the combustion gas passage (6). The arrangement pitch of the solution pipes (9a), (9a) ... Group arranged in the vicinity of both inner walls of the passage (6) is such that the solution pipes (9b) arranged in parts other than the vicinity of both inner walls of the passage (6). ), (9b) ... It is made narrower than that of the group. That is, the solution pipes (9a), (9a) ... Group are arranged in the passage (6) more closely than the solution pipes (9b), (9b).

In addition, (10) is a pipe for introducing the absorption liquid sent from the absorber (not shown) side of the absorption refrigerator, and (11) is steam for introducing the refrigerant vapor to the condenser (not shown) of the absorption refrigerator. Outlet pipe, (12)
Is a steam header, (13) is an insertion port of a gun type burner (not shown), and (14) is a mount for the body (1). Although not shown in the figure, the generator is of course provided with a lead-out pipe for the absorption liquid heated and concentrated here.

A direct-fired generator for an absorption refrigerator configured as described above (hereinafter,
In this generator), from the tube (4) to the smoke chamber (5)
Although the combustion gas that has been inverted and flowed into the combustion gas passage (6) via the passage flows along the inner walls on both sides of the passage (6) while moving from the upstream side to the downstream side of this passage,
Most of them flow while exchanging heat with the absorbing liquid in the solution pipes (9a) and (9b) arranged near both sides of the passage (6) and in the center. Moreover, the solution pipes (9a) near both sides of the passage (6),
The arrangement pitch of (9a) ... Is smaller than that of the solution tubes (9b), (9b).
a), (9a) ... Since the degree of turbulent flow of the combustion gas passing between the groups is higher than that of the solution gas (9b), (9b) ... Compared with the conventional one in which the solution tubes (9b), (9b), ... Are arranged at the same pitch as the arrangement pitch of the solution tubes (9b), in this generator, in the vicinity of both sides of the passage (6), The heat exchange between the gas and the absorbing liquid is promoted, and the amount of gas flowing at a high temperature along the inner walls on both sides of the passage (6) is also reduced. Moreover, in the present generator, the heat exchange area between the combustion gas and the absorbing liquid in the vicinity of both sides of the passage (6) is expanded as compared with the above-mentioned conventional generator, so that the heat exchange amount is also increased.

Therefore, according to the present generator, the gas and the solution in the vicinity of the inner walls on both sides of the combustion gas passage in the direct-fired generator of the type in which the combustion gas passage is arranged horizontally and the solution pipes are vertically arranged in this passage. The heat exchange with the absorbing liquid in the tube can be improved. Therefore, it is possible to increase the heat exchange amount of the entire generator and to balance the heat exchange amount in the vicinity of the inner walls on both sides of the combustion gas passage with the heat exchange amount in the other parts more than the conventional one. It is possible to reduce the overall nonuniformity of the heating concentration of

FIG. 4 is a plan sectional view of another embodiment of the direct heating generator for an absorption refrigerator according to the present invention, in which the same components as those shown in FIG. 3 are designated by the same reference numerals. There is. Fourth
In the illustrated embodiment, the diameters of the solution pipes (9c), (9c) ... Arranged near the inner walls on both sides of the combustion gas passage (6) are the solution pipes (9).
It is smaller than that of b). By making the tube diameter small in this way, it becomes possible to arrange the solution tubes more closely to the inner walls on both sides of the passageway (6).

In the embodiment shown in the figure, the solution pipe group only in the latter half of the downstream side near the inner walls on both sides of the passage (6) is densely arranged, but this is the uppermost stream near the inner walls on both sides of the passage (6). It is needless to say that they may be densely arranged all over from the side to the most downstream side.

(G) Effect of the Invention As described above, according to the present invention, in the type of direct-fired generator in which the combustion gas passage is horizontally arranged in the vessel and the solution pipe group is vertically arranged in the passage, The heat exchange area with the combustion gas of the solution tube group provided near the inner walls on both sides of the combustion gas passage is increased, and the heat exchange between the absorbing liquid and the combustion gas in this tube group is promoted to replace the entire generator. The amount of heat is increased, and the generator can be downsized. As compared with the conventional direct-fired generator in which solution pipes are arranged at the same intervals in any part of the combustion gas passage, heating of the combustion gas to the absorption liquid in the solution pipe group near both sides of the combustion gas passage is performed. The effect of further balancing the amount and the amount of heating in the other part is brought about, and the nonuniformity of heating and concentration of the absorbing solution in these tube groups can be alleviated.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a direct heating generator for an absorption refrigerator according to the present invention, and FIGS. 2 and 3 are transverse cross sections taken along the line I--I of the embodiment shown in FIG. 1, respectively. FIG. 4 is a plan view of a plane view taken along the line II-II in FIG. 4, and FIG. 4 is a plan sectional view of another embodiment of the direct heating generator for an absorption refrigerator according to the present invention. (1) ... Body, (2) ... Solution storage part, (3) ... Steam separation part, (4) ... Furnace tube, (5) ... Smoke chamber, (6) ...
… Combustion gas passage, (7) …… Exhaust gas smoke chamber, (9a),
(9b) …… Solution tube.

Claims (1)

[Claims] 1. A combustion gas passage is horizontally arranged in the container,
Further, in the direct-fired generator in which the solution pipe group is vertically arranged in this passage to heat and concentrate the absorption liquid in the pipe, the solution pipe group provided in the vicinity of both inner walls of the combustion gas passage is provided in the other portion of the passage. The direct-fired generator is characterized in that it is arranged more densely than the solution tube group prepared for.