JPH0627594B2 - Direct-fired generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rectangular direct-fired generator, and more particularly to a direct-fired generator (hereinafter referred to as a generator) used in an absorption refrigerator.

(B) Conventional Technology As a conventional technology of a rectangular generator used in a lithium bromide-water absorption refrigerator, for example, Japanese Utility Model Publication No. 45-1
As disclosed in Japanese Patent No. 5729, a plurality of parallel rectangular hollow shunts (absorption liquid passages) that communicate with each other are formed at both ends of a rectangular container through which an absorption liquid flows in and out, and these shunts are formed. There is one that sends flame and combustion gas from a heater (burner) into a heating cylinder (furnace and flue) formed between them from the bottom to the top.

(C) Problems to be solved by the invention The conventional rectangular generator described above has desirable advantages as a generator for an absorption refrigeration machine that requires a high degree of airtightness because it is easy to weld the joints of the container and the absorption liquid passage. Although it has a square shape, it has the advantage that it can effectively use a small space compared to a round type when it is installed in an absorption refrigerator, but it receives the high temperature flame directly on the outer wall of the rectangular absorption liquid passage. Since it has a lot of locally heated parts, it has a disadvantage that it is easily corroded by the lithium bromide aqueous solution. In addition, due to excessive air bubbles generated due to local heating of the container and the absorption liquid passage, the flow of the liquid at these bottoms is likely to be obstructed, and there is a problem that local concentration is likely to occur and crystals of the absorption liquid are easily caused. Was there.

In addition, in order to prevent local concentration due to stagnation of liquid and bubbles,
Although a generator has been proposed in which a heat insulating material is arranged at the bottom of the container through which the absorbing liquid flows in and out, this generator has a problem in that the degree of utilization of heat of a flame or combustion gas is reduced.

In view of these problems, the present invention can alleviate the stagnation of liquid and bubbles, reduce local heating of the absorbing liquid passage and local concentration of absorbing liquid, and reduce corrosion of constituent members, and flame and combustion gas. The purpose of the present invention is to provide a rectangular direct-fired generator for an absorption chiller, which can enhance the degree of utilization of heat of the flue gas and can easily inspect and clean the flue.

(D) Means for Solving the Problems The present invention, in a square type direct-heating generator for an absorption refrigerator, as a means for solving the above problems, a flue is connected to the rear of the furnace to It is formed symmetrically on both sides, and at the boundary between the furnace and both sides of the flue and the flue, the solution passage is connected vertically to the solution flow section, and the flue extends from the upstream side to the downstream side. A large number of solution flow passages are arranged vertically, and combustion gas discharge ports of the same opening area located at the most downstream part of each flue are formed in the solution flow portion so as to penetrate therethrough, and, A plurality of solution inlets are formed on the bottom of the solution flow section, a solution outlet and a steam outlet are formed on the upper side of the solution flow section, and a flue gas inspection port is formed to face the flow direction of combustion gas. is there.

(E) Action According to the means of the present invention, the flue is formed symmetrically around the furnace and the gas outlets of the respective flues are formed in the same opening area, so that the combustion gas is diverged. Without causing the effect of flowing almost uniformly in the generator,
Moreover, since the vertical solution passage is arranged at the boundary between the furnace and the flue, the combustion gas flowing into the flue is cooled to bring about the effect of preventing the solution flow passage on the upstream side of the flue from being overheated. And,
Since a large number of solution inlets are formed at the bottom of the solution flow section and a solution outlet and a vapor outlet are formed at the upper side of the solution flow section, the bottom of the solution flow section and the solution flow passages and solutions arranged vertically It has the effect of mitigating the retention of bubbles and solutions in the passages and the like. Due to these effects, both the flame and combustion gas on the heating side and the solution on the heated side both flow smoothly in the generator, the degree of heat exchange between them also increases, and local heating of the generator and Local concentration of absorbing liquid is reduced and corrosion of generator components is reduced. In addition, since the flue inspection port is formed to face the flow direction of the combustion gas, almost the entire area can be seen from the upstream side to the downstream side of the flue, and the flue can be inspected and cleaned. It will be easy.

(F) Embodiment FIG. 1 is a partially cutaway side view showing a schematic structure of an embodiment of a square type direct-heating generator for an absorption refrigerator according to the present invention, and FIG. It is sectional drawing which looked at the -X cross section from the front side of the generator. FIG. 3 is a sectional view of the YY section of FIG. 1 seen from above the generator. Moreover, FIG. 4 is a cross-sectional view of another embodiment of the generator according to the present invention as seen from above.

Direct-fired generator for absorption refrigerator shown in these figures (hereinafter,
Generator)), (1) is a rectangular outer cylinder, and (2) is a rectangular inner cylinder, and the absorbing liquid (for example, between the inner cylinder wall and the outer cylinder (1) wall (for example, Lithium bromide aqueous solution] and refrigerant vapor (for example, water vapor) solution flow section in which bubbles flow (3), (4),
(5), (6), (7) and (8) are formed. (9) is a furnace formed in the center of the generator, and the flue (1
0) and (11) are symmetrically formed on both sides of the furnace (9), and the solution flows at the boundaries between the furnace (9) and the flues (10) and (11) on both sides thereof. Solution passages (12) and (13) communicating with the parts (3), (4) and (8) are arranged vertically. That is,
The furnace (9) and the flues (10) and (11) are surrounded by a solution passage through which the absorbing liquid flows and a solution flowing portion. (14) and (15) are combustion gas discharge ports located near the most downstream part of the flue (10) and (11), respectively, and these discharge ports are the solution flow sections (6) and (7), respectively.
Are formed so as to penetrate through and have the same opening area. It should be noted that (16) is, for example, a flame inlet of a gun-type burner.

Further, (P), (P) ... Group are solution flow passage groups communicating with the solution flow sections (3), (8), and these solution flow passage groups are respectively provided with flues (1
0) and (11) are arranged vertically from the upstream side to the downstream side. (P _E ) is an introduction pipe for the absorption liquid pumped from the absorber (not shown) of the absorption refrigerator, and this introduction pipe is connected to the absorption liquid introduction chamber (17) provided at the bottom of the generator. ing. Then, by forming a large number of holes of the same size at a predetermined interval on the bottom wall of the outer cylinder (1), which is a partition wall of the absorbent introduction chamber (17) and the solution flow section (8). At the bottom of the solution flow section, that is, the solution flow section (8), a large number of solution inlets (E), (E), etc., into which the absorption solution from the absorption solution introduction chamber (17) flows are formed. Moreover, (P _O ) is a pumping pipe in which the absorbing liquid heated and condensed by the generator and the bubbles of the generated refrigerant vapor flow, and by connecting this pumping pipe to the upper wall of the outer cylinder (1), the solution An outlet (O) for the solution and vapor is formed on the upper side of the flow section, that is, on the solution flow section (3).

Although not shown, the solution outlet and the vapor outlet may be formed separately. For example, a liquid layer and a vapor layer are formed in the solution flow section (3) by widening the space between the outer cylinder (1) upper wall and the inner cylinder (2) upper wall, and the vapor outlet and the liquid communicating with this vapor layer are formed. A solution outlet communicating with the layer may be provided in the solution flow section (3).

And, (18), (18) ... Are formed by being surrounded by the outer cylinder (1) wall, the inner cylinder (2) wall, the solution passage (12), (13) wall or the solution flow passage (P) wall. It is a passage for combustion gas, and (19) and (20) are flue gas inspection ports formed at the most downstream parts of the flues (10) and (11) so as to face the flow direction of the combustion gas, respectively. Also, (21), (2
2) are the lids of the flue gas inlets (19) and (20), respectively.

Generator configured in this way (hereinafter referred to as this generator)
In the furnace (9), the high temperature [1100 ° C] flame or the heat of combustion gas [radiant heat] flows through the solution flow sections (3) and (8) and the solution passages (12) and (13). Robbed by the furnace
The temperature of the combustion gas flowing from the rear of (9) to the flues (10) and (11) on both sides of the flue is lowered [to a temperature of about 900 ° C]. In this way, since the cooled combustion gas flows into the flues (10) and (11), the solution flow passages arranged on the upstream side of these flues.
The overheat of the absorbing liquid in (P) is prevented, and the excessive generation of the refrigerant vapor in this flow passage is also prevented. Then, bubbles of the refrigerant vapor are generated in the solution flow passages (P), (P), etc., and the absorbed liquid concentrated as the bubbles rise is pumped from the bottom to the top so that the inside of the solution flow passage is smoothed. Flow to.

On the other hand, although the high temperature heat is applied to the absorbing liquid in the solution passages (12), (13), the amount of the liquid is much larger than that in the solution flowing passages (P), (P) ... The overheating of the absorbent in (12) and (13) is also prevented. Therefore, the solution passages (12), (13)
The absorption liquid inside is also the same as that inside the solution flow passages (P), (P) ...
It flows smoothly.

In addition, the flow of the absorbing liquid and the bubbles in the solution flow sections (4), (5), (6), and (7) are maintained in a good condition, almost the same as in the solution flow passage group.

On the other hand, the flow of the absorbing liquid in the solution flow section (8) is a vertically formed solution flow section (4), (5), (6), (7) and solution passages (12), (13). ) Or solution flow passages (P), (P) arranged vertically
Although it is not promoted by the buoyancy of bubbles like that in the group, it is maintained well because it is promoted by the inertial force of the absorbing liquid flowing in from a large number of solution inlets (E), (E).

Then, the absorbing liquid and air bubbles that have risen to the solution flow section (3) flow out from the outlet (O) and rise to the pumping pipe (P _O ) as in the conventional generator.
To reach a gas-liquid separator (not shown) of the absorption refrigerator.

As described above, in the present generator, the absorbing liquid flows smoothly, the stagnation of the liquid and the accompanying excessive temperature rise in the local area are prevented, and at the same time, the corrosion of the constituent members of the generator is reduced.

In addition, in this generator, the combustion gas flows from the flue (10) and (11) which are symmetrical with respect to the furnace (9), from the outlets (15) and (15) of the same opening area, respectively. Since it flows out, the deviation of the flow of the combustion gas is reduced. Further, the flues (10) and (11) having a lower combustion gas temperature than the inside of the furnace (9) are provided with a large number of solution flow passages (P), (P) ... Groups to increase the heat exchange area. Therefore, the deviation of the amount of heat exchanged between the high combustion gas temperature region and the low combustion gas temperature region is reduced.

As described above, the smooth flow of the absorbing liquid and the uneven distribution of the heat exchange amount and the reduction of the uneven distribution of the flow of the combustion gas are mixed, and in the present generator, the absorbing liquid is heated almost uniformly and its local Heating and local concentration are prevented, and highly efficient heat exchange and generation of refrigerant vapor [concentration of absorption liquid] are achieved.

In addition, in this generator, by removing the lids (21) and (22) and looking into the flue inspection ports (19) and (20), the flue (1
The entire area can be seen from the upstream side to the downstream side of (0) and (11), and the dirt inside the flues (10) and (11) can be easily inspected and cleaned. .

(G) Effect of the invention As described above, the generator of the present invention reduces the unevenness of the flow of combustion gas and the effect of maintaining a good and smooth flow of the absorbing liquid while taking advantage of the advantages of the conventional rectangular generator. It has the effect of preventing local heating, local concentration of absorption liquid, and corrosion of the constituent members of the generator, which were the disadvantages of the square-type direct-burning generator, with high efficiency heat exchange and absorption liquid absorption. Concentration can be achieved and flue gas can be easily inspected, which is of high practical value.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing the schematic structure of an embodiment of a rectangular direct-fired generator according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.
FIG. 3 is a cross-sectional view of the cross section as seen from the front side of the generator, FIG. 3 is a cross-sectional view of the Y-Y cross section of FIG. 1 as seen from above, and FIG. 4 is a cross-sectional view of the cross section of the embodiment of FIG. (1) …… Outer cylinder, (2) …… Inner cylinder, (3), (4), (5), (6),
(7), (8) …… Solution flow section, (9) …… Furnace, (10), (11) ……
Flue, (12), (13) …… Solution passage, (14), (15) …… Combustion gas outlet, (18) …… Combustion gas passage, (19), (20) …… Flue Inspection port, (21), (22) ... Lid, (E) ... Solution inlet, (O) ...
… Exit, (P)… Solution flow path.

Claims (1)

[Claims] 1. A furnace, a flue, a solution flow section surrounding these,
In a rectangular direct-fired generator consisting of a plurality of solution flow passages communicating with these solution flow passages and a vapor flow passage, a flue is formed symmetrically on both sides of the furnace in communication with the rear of the furnace, At the boundary with the flue, the solution passages communicating with the solution flow section are arranged vertically respectively, and a plurality of solution flow passages are arranged vertically from the upstream side to the downstream side of each flue, respectively. A combustion gas discharge port having the same opening area, which is located in the vicinity of the most downstream part of the flue, is formed so as to penetrate the solution flowing part, and the solution inlet is formed at the bottom of the solution flowing part, and the solution outlet and the vapor outlet are also formed. Is formed on the upper side of the solution flow section, and the flue inspection port penetrating the solution flow section is formed in the vicinity of the most upstream or most downstream section of each flue so as to face the flow direction of the combustion gas. Direct-fired generator characterized by being