JP3300083B2 - Water tube evaporator with vertical drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water tube type evaporator having a vertical drum on the outer periphery.

[0002]

2. Description of the Related Art For example, in an absorption refrigerator or absorption chiller / heater using an aqueous solution of lithium bromide (LiBr), when an absorption solution having an intermediate concentration is heated to evaporate and concentrate moisture, the absorption solution is placed around a combustion chamber. While introducing and raising the absorption liquid, it was heated and concentrated by the combustion exhaust gas.

[0003]

For this reason, there has been a problem that the thermal efficiency is not so good and the thickness of the refractory heat-resistant material becomes large. The present invention has been made in view of the above points, and provides a vertical descent drum on the outer periphery of a can, and introduces the combustion gas from the combustion chamber to the inner periphery of the two rows of finned liquid risers. Thus, an object of the present invention is to provide an evaporator capable of reducing the thickness of a refractory heat-resistant material, improving thermal efficiency, and achieving downsizing.

[0004]

In order to achieve the above object, a water tube type evaporator with a vertical drum according to the present invention is shown in FIGS.
As shown in FIG. 4 , a combustion chamber 18 is provided at a vertically central portion of a main body casing 16 having a vapor outlet 10 at an upper portion, a liquid inlet 12 at a lower portion, and a liquid outlet 14 at an upper portion. Around the chamber 18, the cross section has a low gas flow resistance
Approximate egg formed by a substantially elliptical or curved surface with multiple curvatures
Inner stream water pipe 22 and outer stream water pipe 2 which are substantially streamlined
4, a large number of these liquid risers are arranged vertically and concentrically in two rows, so that the inside of the main body casing 16 has a double structure, and the liquid that has risen in the liquid risers falls. You
The vertical drum 20 is formed, and the inner row water pipe 22 and the outer row water pipe 2 are formed.
Between 4 and disposed substantially multistage horizontally numerous fins 26 between the outer column water tube 24 and the vertical drum 20, the inner column
When the surface area of the inner surface of the water pipe 22 and the outer row water pipe 24 increases,
In both cases, the liquid is thinly and evenly stretched by the surface tension of the liquid.
Formed on a corrugated surface 32 with a constant radius of curvature
The combustion gas generated in the combustion chamber 18 is supplied to the gas passage 28 between the inner row water pipe 22 and the outer row water pipe 24 and the outer row water pipe 24.
And a vertical drum 20.

[0005] The good urchin, the cross section of the inner row water tube 22 and the outer row water pipe 24, a substantially stream comprising substantially oval formed by a curved surface having a substantially elliptical or a plurality of curvature less gas flow resistance It shall be the linear. Also, as shown in FIGS. 2 to 4, the inner surfaces of the inner row water pipe 22 and the outer row water pipe 24 have a constant radius of curvature surface so that the surface area increases and the liquid is thinly and uniformly stretched by the surface tension of the liquid. Formed on the corrugated surface 32
You. As shown in FIG. 4, the outer water pipe 24 having a substantially elliptical or oval cross section and having a substantially streamline shape has a mounting angle in the long axis direction of the cross section such that the gas flow is smooth. Is desirably changed little by little so as to be arranged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. However, the shapes of the constituent members described in this embodiment, the relative arrangement thereof, and the like are not intended to limit the scope of the present invention only to them, unless otherwise specified. It's just 1 and 2 show an embodiment of a water tube type evaporator with a vertical drum according to the present invention. The evaporator of this example has a combustion chamber 18 at the center, a number of liquid risers arranged vertically around the periphery of the combustion chamber 18, and a plurality of fins 26 arranged in multiple stages substantially horizontally, Further, the outer fin has a structure in which the outer periphery is surrounded by a vertical drum 20.

The water or the solution flows from the liquid inlet 12 into the lower header 13 and is heated by the drum 20 and the liquid riser including the inner row water pipe 22 and the outer row water pipe 24 to generate steam. Then, the water or solution heated to a high temperature is collected in the upper header (header) 11 and flows out from the solution outlet 14. 13 is a steam separator, and 15 is a burner.

[0008] As shown in FIG. 2, inner row water pipe 2 2 What happened is connected closely, but opening 36 is provided in one place, inner row water pipe the combustion gas through the opening 36 22
Gas passage 28 between the outer row water pipe 24 and the outer row water pipe 2
After flowing into the gas passage 30 between the vertical drum 4 and the vertical drum 20 and heating the horizontal fins 26 and the water pipes 22 and 24, the gas is discharged from the combustion exhaust gas outlet 38. Most of the heated water or solution flows out of the liquid outlet 14, and part of the water or solution heats the horizontal fins 26 and the outer row water pipe 24 while descending in the vertical drum 20.

In the case shown in FIG. 2, the evaporator according to the present invention comprises:
Since the inner row water pipe 22 and the outer row water pipe 24 have a substantially streamline shape having a substantially elliptical shape or a substantially oval shape formed by a curved surface having a plurality of curvatures, when the combustion gas flows at high speed, the resistance is small, There is an advantage that the motor output of an air push-in fan (not shown) connected to the wind box 40 can be reduced and the can can be made smaller.

[0010] As an example of the water pipe, a substantially elliptical cross-section is shown, and the major axis and the gas flow are arranged so as to be substantially parallel to each other. A substantially streamline shape having a substantially oval shape formed by a curved surface may be used. In addition, as shown in FIG. 3, the outer row water pipes 24 may be arranged on the circumference at intervals. In this case, there is an advantage that the combustion exhaust gas can freely pass through the inside and outside of the outer row water pipe 24, and the heat transfer is more sufficiently performed.

As shown in FIGS. 2 and 3, the inner surfaces of the inner row water pipe 22 and the outer row water pipe 24 are formed on a corrugated surface 32. In this case, the surface area of the inner surface increases, and the liquid is thinly and uniformly stretched by the surface tension of the liquid, so that heat transfer can be performed very efficiently. As the corrugated surface 32, a constant radius of curvature surface (consta)
nt curvature surface, CCS)
It is preferred that If CCS is used, the above-mentioned effect is further exhibited.

FIG. 4 shows another embodiment of the evaporator according to the present invention. The evaporator of this embodiment has a substantially elliptical cross section or
The outer stream water pipe 24 having a substantially oval shape and having a substantially streamline shape is provided so that the gas flow is smooth, and the outer cross section water pipe 24 has a long axis cross section.
The gas is arranged so as to gradually change the mounting angle in the direction , and the gas is configured to flow through between the adjacent outer row water pipes. Other configurations and operations are the same as those in FIG.

In the above embodiment, the case of a high-temperature regenerator in an absorption refrigerator or an absorption chiller / heater has been described. It can be applied to a tubular once-through boiler and the like.

[0014]

As described above, the present invention has the following effects. (1) A vertical descent drum is provided on the outer periphery of the can, and the combustion gas from the combustion chamber is introduced around the inner and outer two rows of finned liquid risers, so that the thermal efficiency is improved. Furthermore, the thickness of the refractory and heat-resistant material can be reduced, and the size of the can can be reduced. (2) the so columns water tube and the outer column water tube is substantially streamlined to a substantially oval formed by a curved surface having a substantially elliptical or a plurality of curvatures, less resistance when the combustion gases flowing at a high speed As a result, the motor output of the air pushing fan is reduced, and the can can be made smaller. (3) By forming the inner surface of the inner row water pipe and the outer row water pipe on the corrugated surface, the surface area is increased and the liquid is thinly and uniformly spread on the inner surface of the pipe by the surface tension of the liquid, so that the heat transfer is greatly improved. Further, the size of the can can be further reduced. (4) When the outer water pipes having a substantially elliptical or oval cross section and having a substantially streamline shape are arranged by gradually changing the mounting angle in the long axis direction of the cross section, the flow of gas is reduced. As a result, heat exchange can be performed more efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an embodiment of a water tube type evaporator with a vertical drum according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a cross section taken along line 2-2 in FIG.

FIG. 3 is a plan sectional view showing another example of an arrangement structure of water tubes in the evaporator of the present invention.

FIG. 4 is an explanatory diagram showing another example of a cross section taken along line 2-2 in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steam outlet 12 Liquid inlet 14 Liquid outlet 16 Main body casing 18 Combustion chamber 20 Vertical drum 22 Inner water pipe 24 Outer water pipe 26 Fin 28 Gas passage 30 Gas passage 32 Corrugated surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-155403 (JP, A) JP-A-63-96497 (JP, A) JP-A-57-80189 (JP, A) JP-A-3-3 170701 (JP, A) JP-A-57-90503 (JP, A) JP-A-57-67702 (JP, A) JP-A-63-109803 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) F22B 21/06 F22B 37/12

Claims (2)

(57) [Claims] A combustion chamber is provided at a vertically central portion of a main body casing (16) having a vapor outlet (10) at an upper portion, a liquid inlet (12) at a lower portion, and a liquid outlet (14) at an upper portion. A chamber (18) is provided. Around the combustion chamber (18), the cross-section has a gas flow resistance.
Formed by a substantially elliptical shape with little or a curved surface with multiple curvatures
A substantially streamlined inner row of water tubes (22)
Arranged beauty outer row water pipe (24), in the vertical direction of these large number of liquid riser and arranged in two rows concentric, the solution was the inside of the main casing (16) in the double structure
A vertical drum (20) from which the liquid having risen in the riser falls is formed between the inner row water pipe (22) and the outer row water pipe (24), and between the outer row water pipe (24) and the vertical drum (20). And a large number of fins (26) are provided in multiple stages in a substantially horizontal direction, and the inner surfaces of the inner row water pipe (22) and the outer row water pipe (24) are
As the surface area increases, the liquid becomes thin and even due to the surface tension of the liquid.
Wave with constant radius of curvature surface to be stretched in one
The combustion gas formed on the mold surface (32) and generated in the combustion chamber (18) is supplied to the inner row water pipe (2).
2) the gas passage (28) between the outer water pipe (24) and the gas passage (30) between the outer water pipe (24) and the vertical drum (20). Characteristic water tube type evaporator with vertical drum . 2. An outer stream water pipe (24) having a substantially elliptical or substantially oval cross section and having a substantially streamlined shape has a small mounting angle in the longitudinal direction of the cross section so that gas flow is smooth. 2. A water tube type evaporator with a vertical drum according to claim 1, wherein the evaporators are arranged so as to be changed one by one.