JPH079323B2 - Direct-fired generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an improvement in a direct-fired generator that heats and concentrates an absorbing liquid with combustion gas.

(B) Conventional technology As a conventional technology for a direct-fired generator that heats an absorbing liquid with combustion gas, as shown in, for example, Japanese Utility Model Publication No. 55-48244 and Japanese Utility Model Publication No. 60-8292, It is known that a combustion gas passage (smoke pipe) for heating is horizontally arranged in the vessel.

(C) Problems to be Solved by the Invention In the above-described conventional generator, the combustion gas gradually rises while flowing in the horizontal smoke pipe, and the flow of the combustion gas at the downstream side thereof moves upward in the smoke pipe. Since it is biased, there is a problem that uneven heating and concentration of the absorbing solution are likely to occur.

The present invention has been made in view of this problem, and an object thereof is to provide a direct-fired generator capable of alleviating uneven heating and concentration of an absorbing liquid.

(D) Means for Solving Problems As a means for solving the above problems, the present invention provides a large number of finned solution pipe groups in a combustion gas passage (smoke pipe) horizontally arranged in the generator. The solution tubes arranged vertically on the downstream side of the passage have fins down to the outer periphery thereof.

(E) Action In the direct-fired generator of the present invention, the fins provided on the upper side of the solution pipe exert the action of suppressing the rise of the combustion gas flow and the function as a guide for guiding the gas flow downward, and thus the passage for the combustion gas is provided. Since the upward bias of the gas flow inside is reduced, the temperature unevenness in the passage is reduced, and uneven heating and concentration of the absorption liquid can be alleviated.

(F) Embodiment FIG. 1 is a vertical cross-sectional view of an embodiment of a direct heating generator for an absorption refrigerator according to the present invention, and FIGS. 2 and 3 show the embodiment 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), (9c), (9d), and (9e) are the first and second rows, the third row, and the fourth row of the most downstream part of the combustion gas passage (6), respectively. Solution tubes vertically arranged in the 5th and 6th rows, the 7th and 8th rows, and the 9th to 12th rows, and these tube groups communicate with the solution storage section (2). The solution pipe (9a) has fins formed on the entire outer periphery thereof, and the solution pipe (9b) has a smooth outer periphery of the lower quadrant, while fins are formed on the outer periphery of other portions. Has been done. Further, the solution pipe (9c) has fins formed in a portion slightly lower than the upper half of the outer periphery thereof, while the outer periphery of the other portion is formed smoothly, and the fin is formed in the solution pipe (9d). The part of the outer periphery that extends slightly above the lower half of the outer periphery is formed smooth, while the fins are formed on the outer periphery of the other part. In addition, the solution tube (9e) is formed so that the entire outer circumference thereof is smooth.

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 which has been inverted and flowed into the passage (6) for combustion gas flows upward while flowing from the upstream side to the downstream side of this passage, the rise is suppressed by the fins of the solution pipe. Since the flow of the combustion gas is directed downward, the amount of the combustion gas flowing through the bottom of the passage is larger than that in the case where only the solution pipe having no fin is provided in the passage (6). That is, the fins formed on the outer periphery of the upper portion of the solution pipe serve as a guide for guiding the flow of the combustion gas in the passage (6) downward. Moreover, in this generator, many fins are formed on the upper outer periphery of the solution tube toward the downstream side of the passage (6) while the smooth surface of the lower outer periphery is reduced, so that the passage of the combustion gas in a horizontal passage is reduced. (6) It is possible to effectively prevent the gas flow from gradually rising and being biased upward on the downstream side while flowing through the inside. Therefore, in this generator, the gas flow velocity distribution in the combustion gas passage is less uneven and the temperature unevenness is smaller than in the conventional generator in which only the solution pipe without fins is provided in the horizontal combustion gas passage. As a result, it is possible to more uniformly heat and concentrate the combustion gas and the absorbing liquid, and it is possible to improve the concentration efficiency.
For example, when a combustion test is performed with a conventional generator in which the fins are removed by setting the ratio of the vertical length to the horizontal length of the combustion gas passage (6) to 0.4, and this generator is compared. It was confirmed that the gas temperature in the exhaust gas smoke chamber (7) of this generator was about 80 ° C lower than that of the conventional one. As can be seen from the test results, it is clear that the efficiency of heating the absorption liquid by the combustion gas in the combustion gas passage of the present generator is higher than that of the conventional one.

FIG. 4 is a vertical cross-sectional view showing another embodiment of the direct heating generator for an absorption refrigerator according to the present invention. In this figure, the same components as those shown in FIG. Attached. In the embodiment shown in FIG. 4, the combustion gas passage (6)
Solution tubes (9b) and (9e) are arranged in the 1st to 4th rows and the 9th to 12th rows from the most downstream portion of
A structure in which the solution pipes (9f) are arranged in the 5th to 8th rows from the most downstream part of the passageway (6), in which approximately the lower half of the outer circumference is formed smooth while fins are formed in the approximately upper half. Has become.

FIG. 5 is a vertical cross-sectional view showing still another embodiment of the direct heating generator for an absorption refrigerator according to the present invention, and in this figure as well, the same components as those shown in FIG. Is attached. In the embodiment shown in FIG. 5, solution pipes (9b) and (9d) are arranged in the first to sixth rows and the seventh to twelfth rows from the most downstream portion of the combustion gas passage (6), respectively. It has a structured structure.

Also in these embodiments, as in the embodiment of FIG. 1, the fins of the solution pipe exert the function of suppressing the rise of the combustion gas flow in the passage (6).

In the direct-fired generator according to the present invention, the rise of the gas flow in the horizontally arranged combustion gas passage (6) is suppressed, and the gas flow is guided from the upper side to the lower side.
In the passage (6), at least two or more rows of finned solution tube groups or solution tube groups having fins on the upper outer periphery and having a smooth surface on the lower outer periphery are arranged, and these are arranged on the downstream side of the passage (6). As long as they are arranged in a solution tube having fins down to the bottom, they are not limited to the embodiments shown in FIGS. 1 to 5.

(G) Effects of the Invention As described above, the present invention guides a gas flow in a horizontally arranged passage for combustion gas to a lower side, biases the gas flow upward, and causes unevenness in flow velocity distribution and temperature of the combustion gas. The effect of reducing unevenness to alleviate uneven heating and concentration of the absorbing liquid and the effect of improving concentration efficiency are provided to the generator.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a direct heating generator for an absorption refrigerating machine according to the present invention, and FIGS. 2 and 3 are I-I lines of the embodiment shown in FIG. 1, respectively. Cross-sectional view taken along arrow, II-II
FIG. 4 is a plan sectional view taken along a line arrow, and FIGS. 4 and 5 are vertical sectional views showing 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), (9c), (9d), (9e), (9f) ... Solution tubes.

Claims (1)

[Claims] 1. A combustion gas passage is horizontally arranged in the container,
In a direct-fired generator that separates refrigerant vapor while heating the absorbing liquid with the combustion gas flowing through this passage, at least two or more rows of solution pipe groups having fins on the upper outer periphery are vertically arranged in the combustion gas passage. A direct-fired generator characterized in that these solution pipe groups are arranged on the downstream side of the passage and have fins to the lower part.