JP3754123B2 - Direct high temperature regenerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the structure of a direct high temperature regenerator of an absorption refrigerator.
[0002]
[Prior art]
A high-temperature regenerator provided in an absorption refrigerator (including what is called an absorption chiller / heater) has a large proportion of both weight and capacity in the absorption refrigerator. Therefore, in order to make the entire absorption refrigerator compact, it is essential to make this high-temperature regenerator compact. Further, as an environmental problem in the high-temperature regenerator, it is necessary to reduce NOx during combustion.
[0003]
Conventional high-temperature regenerators generally adopt a furnace tube smoke tube method or a furnace tube liquid tube method, but these types of high-temperature regenerators can eliminate the combustion chamber as a furnace tube. It was impossible to make it more compact. In other words, attempts to reduce the size are harmful to the reduction in NOx, and the reduction in size and the reduction in NOx have been regarded as conflicting propositions.
[0004]
In order to overcome the limitations of the furnace tube smoke tube system or the furnace tube liquid tube system, a furnaceless tube group system without a combustion chamber has recently been introduced in gas-fired boilers. In this tubeless tube group system, the combustion flame and combustion gas from the burner are directly guided to the liquid tube group, and the size can be made extremely compact by the amount that does not require a combustion chamber, and the NOx reduction has succeeded.
[0005]
[Problems to be solved by the invention]
However, in the furnace tube-less tube group system, the combustion flame and the combustion gas from the burner pass in the immediate vicinity of the liquid tube group. For this reason, the outer surface of the liquid pipe is covered with a high-temperature flame, which may cause inconveniences such as a corrosion accident due to a local high temperature and crystallization of the liquid.
[0006]
The present invention has been made to solve the above-described problems. In a tubeless tube group system having a liquid tube group without a combustion chamber and through which a combustion flame and combustion gas pass most recently, the temperature increases. It is an object of the present invention to provide a direct high temperature regenerator that can prevent inconvenience.
[0007]
[Problems to be solved by the invention]
In order to achieve the above object, the invention of claim 1 is a direct high temperature regenerator in which a combustion flame directly hits a vertically provided liquid pipe without having a furnace tube, inside the liquid pipe , In addition, the present invention is a direct high temperature regenerator characterized in that a spongy metal is attached at a lower position inside the liquid pipe .
[0010]
The invention according to claim 2 is the high-temperature regenerator according to claim 1, wherein the spongy metal is attached to the inside of a liquid pipe provided at a position close to the combustion flame.
[0011]
A third aspect of the present invention is the direct high temperature regenerator according to the first aspect, wherein the spongy metal is attached to the inside of a finned liquid pipe provided at a position far from the combustion flame.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described below with reference to FIGS.
Combustion flames and combustion gases from a burner (not shown) provided at the burner mounting port 1 pass through the burner mounting port 1 (burner) in the immediate vicinity of a large number of vertical liquid pipe groups 3 (3A, 3B, 3C). . The vertical liquid pipe group 3 is configured by arranging a large number of liquid pipes 5 in the vertical direction, and the rare absorbent passes through the liquid pipe 5. The upper and lower portions of each liquid tube 5 communicate with the solution reservoir 7. This solution reservoir 7 is arranged around a furnace wall 8 through which a combustion flame or combustion gas passes, and is composed of an upper surface portion 7A, a lower surface portion 7B, and a side surface portion 7C. Each portion is a double wall of the furnace wall 8 and the outer wall 8A. It is formed inside the structure and passes through a rare absorbent.
[0013]
The vertical liquid pipe group 3 is divided into three liquid pipe groups 3A, 3B, 3C. That is, the first liquid pipe group 3A that is close to the burner and hits the combustion flame, the second liquid pipe group 3B in which the combustion gas flows slightly far from the burner, and the combustion gas that flows further around the second liquid pipe group 3B. It is divided into three liquid tube groups 3C. The 3rd liquid pipe group 3C is provided in the chimney connection port 9 side, and the fin 11 is attached to each liquid pipe 5, The structure which can collect | recover heat | fever also from the combustion gas which became low temperature and became exhaust gas It has become.
[0014]
Further, the rare absorbing liquid flows into the upper part of the pipe wall 7 through the inflow pipe 13 provided on the upper part of the liquid pipe wall 7. Since the inflow position is not the upper part of the liquid pipe 5 but the upper part of the pipe wall 7, the inflowing diluted absorbing liquid tries to descend through the side surface portion 7 </ b> C of the pipe wall 7 and is heated inside the liquid pipe 5. Since the rare absorbent tends to rise, it is easy to create a large circulating flow throughout. By such a circulating flow, heating of the rare absorbent in the entire direct high-temperature regenerator is easily performed.
[0015]
Now, the inflowing rare absorbing liquid descends the side surface portion 7C of the tube wall 7 and reaches the lower surface portion 7B of the tube wall 7. Then, the liquid flows into the liquid pipe 5 from the lower part of the liquid pipe 5 flowing in the lower surface portion 7B of the pipe wall 7. By this time, the rare absorbent has been sufficiently heated and has reached a temperature in the vicinity of the boiling start temperature.
[0016]
As shown in enlarged views in FIGS. 3 and 4, a cylindrical sponge metal 13 is attached to the inner peripheral portion of the lower portion of the liquid pipe 5. Therefore, the rare absorption liquid that has flowed in from the lower part of the liquid pipe 5 immediately contacts the spongy metal 13, and bubble nuclei are easily formed as described later.
The liquid pipe 5 to which the spongy metal 13 is attached is the liquid pipe 5 provided at a position close to the burner. In addition, in the vertical direction of the liquid pipe 5, it is particularly attached to the lower part.
[0017]
The cylindrical spongy metal 13 has a gap 17 and an inner surface of the liquid pipe 5 by the action of the spacer 15 integrally formed on the cylindrical surface. Since the gap 17 is provided, the rare absorbing liquid contacts both the inner peripheral surface and the outer peripheral surface of the cylindrical sponge-like metal 13. Therefore, formation of bubble nuclei becomes easier.
[0018]
The radial dimension of the spacer 15, and hence the gap dimension between the spongy metal 13 and the inner surface of the liquid pipe 5 is, for example, about 0.5 mm at the maximum. Sponge-like metal is formed by, for example, Ni, Ni—Cr metal, alloy, Ni—Cr—Al alloy or the like in a three-dimensional network like sponge. It is desirable that the holes forming the mesh have a diameter of about 100 μm to several mm and a porosity of about 85% or more.
[0019]
In terms of the number of holes, it can be used from about 6 to 11 pieces / inch to about 20 to 70 pieces / inch, and particularly preferably from about 11 to 17 pieces / inch to 26 to 35 pieces / inch. It is about. Moreover, when these are seen by a specific surface area, it is about 550-7500 square m / cubic m, and this is about 1.3-20 times compared with the thing when a hole does not exist.
[0020]
Therefore, when the spongy metal is attached to the inside of the liquid tube 5, the specific surface area in contact with the absorbing liquid is remarkably increased and the formation of bubble nuclei becomes easy. That is, in the past, bubble nuclei were formed only on the inner surface of the liquid tube, but by attaching the sponge metal in this way, not only the inner surface of the liquid tube but also the absorbing liquid of the sponge metal contacted. Bubble nuclei are also formed from the surface, causing boiling.
[0021]
Moreover, since the specific surface area in contact with the absorbing liquid is remarkably increased, the heat transfer efficiency is improved.
[0022]
As described above, this embodiment has the following effects.
That is, the formation of bubble nuclei is facilitated by the action of the sea surface metal metal 13, and when boiling easily occurs, the rise of the rare absorption liquid in the liquid pipe 5 is strongly generated, and the side surface portion of the pipe wall 7 is generated. Combined with the lowering of the rare absorbent at 7C, the entire circulating flow of the rare absorbent can be made stronger.
[0023]
Since the whole circulation flow can be strengthened, the heat transfer efficiency from the combustion flame to the absorbing liquid can be improved in combination with the remarkable increase in the specific surface area with which the absorbing liquid comes into contact with the spongy metal.
[0024]
Moreover, since the whole circulation flow can be strengthened, local overheating can be prevented, and crystallization of the absorbing solution due to corrosion perforation and overconcentration accompanying local overheating can be prevented.
[0025]
Further, by providing the sea surface metal 13 at the lower part of the liquid pipe 5, it is possible to promote the fluidization by promoting the boiling of the absorbent at the lower part of the liquid pipe 5 where high concentration absorbent is likely to accumulate. In particular, crystallization due to overconcentration of can be prevented. In addition, by providing the spongy metal 13 at the lower part of the liquid pipe 5, boiling occurs in the lower part of the liquid pipe 5, and as a result, the absorption liquid flows actively from the lower part to the upper part of the liquid pipe 5. The entire liquid tube can collect heat uniformly.
[0026]
In addition, since the inner surface of the liquid pipe 5 is not processed but only the spongy metal 13 is attached to the inner peripheral portion of the liquid pipe, the manufacturing is easy.
[0027]
In the above embodiment, the sea-surface metal 13 is provided at the lower part of the liquid pipe 5 disposed at a position close to the combustion flame. However, in other embodiments, other particularly local components are used. For example, the full length portion of the liquid pipe provided at a position close to the combustion flame, a fin 11 provided at a position far from the combustion flame, in a portion where overheating is likely to occur or a position where the boiling start temperature is likely to be reached. There is also a great effect in providing a sea surface metal metal in the finned liquid tube 5 which is attached and easily absorbs heat.
[0028]
【The invention's effect】
As described above, according to the invention of claim 1, 2, or 3 , boiling is promoted by the spongy metal attached to the inside of the liquid pipe, and the flow of the liquid in the liquid pipe is activated by this boiling, Therefore, local overheating of the liquid can be prevented, and inconveniences such as corrosion piercing and liquid crystallization due to overconcentration can be prevented.
[0030]
In addition, according to the invention of claim 2 or 3 , by attaching a spongy metal to a site that is likely to reach the vicinity of the local overheating or boiling start temperature of the liquid, the boiling at this site is promoted, The fluid flow can be activated to prevent overheating.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional view showing a main part of a direct high temperature regenerator according to an embodiment of the present invention.
FIG. 2 is a vertical sectional view of FIG.
FIG. 3 is an enlarged cross-sectional view of a main part III in FIG.
4 is a horizontal sectional view taken along the line IV-IV in FIG. 3;
[Explanation of symbols]
5 Liquid tube 7 Solution reservoir 8 Furnace wall 8A Outer wall 11 Fin 13 Sponge metal 15 Spacer

Claims (3)

In a direct high temperature regenerator where the combustion flame directly hits the liquid pipe provided vertically without having a furnace tube,
A direct high-temperature regenerator characterized in that a spongy metal is attached inside the liquid pipe and at a lower position inside the liquid pipe .   2. A direct high temperature regenerator according to claim 1, wherein a sponge metal is attached to the inside of a liquid pipe provided at a position close to the combustion flame.   2. The direct high-temperature regenerator according to claim 1, wherein the sponge metal is attached to the inside of a finned liquid pipe provided at a position far from the combustion flame.

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