JP3865326B2 - High temperature regenerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the structure of a 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 such limitations of the furnace tube smoke tube system or the furnace tube liquid tube system, in a gas-fired boiler, a furnace tube-less tube group system in which a combustion chamber is not provided but a flat combustion surface is provided has been recently introduced. In this tubeless tube group system, the combustion flame and combustion gas from the combustion section such as the flat plate combustion surface are directly guided to the tube group, and the extreme compactness is achieved by the amount that does not require a combustion chamber, and NOx reduction succeeds. is doing.
[0005]
[Problems to be solved by the invention]
However, in the tubeless tube group system, the combustion flame and combustion gas from the combustion section such as the flat plate combustion surface pass through the tube group. For this reason, the outer surface of the tube of the tube group is covered with a high-temperature flame, which may cause inconveniences such as a corrosion accident due to high temperature and crystallization of liquid.
[0006]
The present invention has been made in order to solve the above-described problems. In a tubeless tube group system having a tube group without a combustion chamber and through which a combustion flame and combustion gas pass most recently, there is a disadvantage associated with an increase in temperature. It aims at providing the high temperature regenerator which can prevent.
[0007]
In order to achieve the above object, the invention of claim 1 is characterized in that the combustion flame and combustion gas from the combustion section by a vertical flat plate combustion surface or the like passes through the furnace wall in the horizontal direction and is discharged from the chimney connection port. And a vertical liquid pipe group comprising a plurality of vertical pipes communicated with the upper surface portion and the lower surface portion of the double-structured tube wall disposed at the furnace wall, and a dilute absorbent in the tube wall. In the high-temperature regenerator of an absorption refrigerator that is heated and concentrated through
The vertical liquid pipe group, the first tube bank close to the combustion section, said from the combustion section first tubular distant second tube bank from the group, the second tube bank Home far the chimney from the combustion unit provided on the side of the connection port and divided into the third tube bank to recover flue gas heat and flows the dilute absorbent liquid in the lower portion of the first tube bank after preheated through the third tube bank that Thus, the high-temperature regenerator is characterized by energizing the flow of the diluted absorbent in the first tube group .
[0008]
According to the second aspect of the present invention, the combustion flame and the combustion gas from the combustion section due to a flat plate combustion surface in the vertical direction are passed through the furnace wall in the horizontal direction and discharged from the chimney connection port, and at the position of the furnace wall. A vertical liquid pipe group consisting of a number of vertical pipes communicating with the upper and lower parts of a double-walled pipe wall, and a high temperature of an absorption refrigerator that heats and concentrates the diluted absorbent through the pipe wall. In the regenerator,
Among the vertical tube groups, a predetermined tube group close to the combustion unit is a first tube group, a predetermined tube group far from the first tube group from the combustion unit is a second tube group, and inside the tube wall By providing a separator that separates the first tube group and the second tube group, and providing an introduction structure that introduces the diluted absorbent pressurized by a pump mainly only in the lower part of the first tube group, A high-temperature regenerator characterized by energizing the flow of the dilute absorbent in one tube group.
[0009]
The invention according to claim 3, wherein the introduction structure, the not positioned in the lower portion of the lower surface portion having no said first tube bank dilute absorbent liquid inlet box for the introduction, the bottom of said first tube bank The high-temperature regenerator according to claim 2, wherein the high-temperature regenerator is positioned only at the top.
[0010]
The invention of claim 4, wherein the introduction structure, the inlet for the inflow for plurality is arranged corresponding to the lower portion of each tube of the first tube bank, each tube inner diameter of the inlet The high-temperature regenerator according to claim 2, wherein the high-temperature regenerator is smaller than the inner diameter.
A fifth aspect of the present invention is the high temperature regenerator according to the fourth aspect, wherein the inflow port is projected toward a lower portion of each pipe.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described below with reference to FIGS.
The fuel gas 3 and air 5 taken toward the high-temperature regenerator 1 are mixed and ignited to start combustion, pass through the flat plate combustion surface 7 which is a combustion part, and combustion is promoted. This combustion promotion eliminates the need for the furnace tube (combustion chamber) required for the conventional furnace tube smoke tube system and furnace tube liquid tube system, and can achieve downsizing and achieve low NOx.
[0012]
As shown in FIG. 1, the combustion section is a combustion section formed by a vertical flat plate combustion surface 7 and the like, and the combustion flame and combustion gas from the combustion section are horizontally passed through the furnace wall and discharged from the chimney connection port. It is something to be made. The combustion flame and the combustion gas that have passed through the flat plate combustion surface 7 pass in the immediate vicinity of many vertical liquid tube groups 9 (9A, 9B, 9C). In these vertical liquid pipe groups 9, a large number of pipes 11 are arranged in the vertical direction, and a dilute absorbing liquid passes through the inside. The upper and lower portions of each tube 11 communicate with the upper surface portion 13A and the lower surface portion 13B of the tube wall 13 , as shown in FIG . The tube wall 13 is disposed at the position of the furnace wall through which the combustion flame and combustion gas pass, and is composed of an upper surface portion 13A, a lower surface portion 13B, and a side surface portion 13C. Pass through.
[0013]
The vertical liquid tube group 9 is divided into three tube groups 9A, 9B, and 9C. That is, it is divided into a first tube group 9A close to the combustion part, a second tube group 9B slightly far from the flat plate combustion surface 7, and a third tube group 9C farther than the second tube group 9B. The third tube group 9C is provided on the side of the chimney connection port 15, and fins 17 are attached to the respective tubes 11, so that the heat can be recovered from the combustion gas that has become slightly exhausted and becomes exhaust gas. ing.
[0014]
The division of the first, second, and third tube groups 9A, 9B, and 9C is performed by a separator 19 provided inside the tube wall 13, and the flow of the rare absorbent is determined by the separator 19.
[0015]
The rare absorbing liquid flowing into the high temperature regenerator 1 passes through a heat exchanger (not shown) connected to the upstream side of the high temperature regenerator 1. Due to the characteristics of this heat exchanger, boiling inside the high temperature regenerator 1 is performed. It is lower than the starting temperature. The rare absorbing liquid having a low temperature flows in from the inflow portion 21 at the upper part of the third tube group 9C using the pump pressure, and descends through the tubes 11 constituting the third tube group 9C. At this time, exhaust gas heat is recovered and the temperature is raised. The rare absorbent is guided to the bypass pipe 23 by the action of the first separator 19a at the lower part of each pipe 11 constituting the third pipe group 9C, and flows into the lower part of the first pipe group 9A. At this time, since the temperature of the rare absorbing liquid is raised to the vicinity of the boiling start point, it immediately boils in the first tube group 9A, and the flow becomes active due to the boiling, and the heat transfer coefficient increases due to this active flow. The dilute absorbent that has been sufficiently heated by the increased heat transfer coefficient is further boiled and concentrated.
[0016]
By increasing the heat transfer coefficient, it is possible to prevent the temperature from becoming higher in the first tube group 9A, which is likely to cause inconvenience due to the increase in temperature. The diluted absorbing liquid that has flowed in does not flow into the second pipe group 9B due to the action of the second separator 19b, and ascends the first pipe group 9A. The rising rare absorbing liquid flows into the upper part of the second tube group 9B. The third separator 19c does not flow into the third tube group 9C but descends to reach the lower portion of the second tube group 9B and flows out from an unillustrated outflow portion.
[0017]
The operation of this embodiment will be described below with reference to FIG.
This figure shows a Duhring diagram, of which (A) is a comparative example, as shown in FIG. 5, without passing the rare absorbent through the third tube group 9C, the first tube group 9A and the second tube group 9A. The dueling diagram in the case of passing through the tube group 9B in order is shown. Among these, (B) represents the Duling diagram in this embodiment, that is, FIG. 5 that are the same as those in FIG. 1 are denoted by the same reference numerals.
[0018]
That is, when the rare absorbent is passed directly through the first tube group 9A and the second tube group 9B without passing through the third tube group 9C as shown in FIG. 5, the rare absorbent is passed through as shown in FIG. After the sensible heat temperature changes, boiling starts and the latent heat temperature changes. In contrast the embodiment of FIG. 1, a dilute absorbent solution as shown in FIG. 2 (B), since it is preheated to recover exhaust gas heat when passed through a pre-Me third tube bank 9C, to near the boiling start point The temperature rises. Thereafter, boiling immediately starts in the first tube group 9A, and heating is performed in the first tube group 9A and the second tube group 9B while changing the latent heat temperature.
[0019]
Thus, in this embodiment, the heating in the first tube group 9A is performed in a state where the diluted absorbent is boiled. That is, boiling can be performed throughout the first tube group 9A. And the flow of a diluted absorption liquid becomes active by boiling, and a heat transfer coefficient becomes high by this active flow. Thus local heating in the first tube bank 9A, the local heating of definitive at the bottom of the first tube bank 9A to dilute absorbent liquid flows compared to the particular prior art can be prevented. For this reason, it is possible to prevent corrosion accidents that are likely to occur in the first tube group 9A and liquid crystallization.
[0020]
(Second embodiment)
A second embodiment of the present invention will be described below with reference to FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
In the second embodiment, the rare absorbent is immediately introduced from the lower portion of the first tube group 9A without passing through the third tube group 9C in advance. However, as in the first embodiment, it is of course possible to flow in from the lower portion of the first tube group 9A after passing through the third tube group 9C in advance.
[0021]
The inflow from the lower portion of the first tube group 9A uses pump pressure by a pump (not shown). The rare absorption liquid sent by the pump pressure is first guided to the rare absorption liquid inflow box 27 via the inflow portion 25. This inflow box 27 is located only in the lower part of the first tube group 9A as shown in FIG. And it is not located in the lower part of the lower surface part 13B of the pipe wall 13 in which the 9A of 1st pipe groups do not exist.
[0022]
The inflow box 27 communicates with the bottom surface plate of the double structure of the lower surface portion 13B of the tube wall 13 through the inflow port 29. A plurality of the inflow ports 29 are provided to form the first tube group 9A. It is located corresponding to the lower portion of each of the plurality of tubes 11. Further, the inner diameter of the inflow port 29 is smaller than the inner diameter of each pipe 11 of the first pipe group 9A.
[0023]
In this way, the rare absorbent is circulated vigorously from the small diameter inlet 29 using the pump pressure, so that the rare absorbent is mainly introduced only into the lower portion of the first tube group 9A. That is, the rare absorbing liquid does not flow into the lower surface portion 13B of the tube wall 13 communicating with the lower portion of the first tube group 9A.
[0024]
In this way, the diluted absorbent that has flowed into the lower portion of the first tube group 9A vigorously descends through the side surface portion 13C of the tube wall 13 after reaching the upper portion. Further, by vigorously flowing from the lower part of the first tube group 9A, the surrounding rare absorbent, that is, the rare absorbent present in the lower surface portion 13B of the tube wall 13 communicating with the lower part of the first tube group 9A is entrained. And flows into the first tube group 9A. Further, the heated diluted absorbent rises inside the first tube group 9A . From these things, as shown with the arrow in FIG.3 (C), a big flow is formed as a diluted absorption liquid.
[0025]
Due to such a flow, the rare absorbing liquid does not stay, and therefore, it is possible to prevent the occurrence of a locally elevated portion only in a part of the tube wall 13 or the tube group 9. By preventing the temperature from rising in this way, it is possible to prevent the occurrence of burnout even when the pump that performs the inflow fails.
[0026]
(Third embodiment)
In the second embodiment described above, the rare absorbent inlet 29 is positioned corresponding to the lower part of the pipe 11 of the first pipe group 9A, and the diameter of the inlet 29 is made larger than the inner diameter of each pipe 11 of the first pipe group 9A. By adopting a smaller introduction structure, the rare absorbing liquid is restricted from flowing into the tube wall 13 communicating with the lower portion of the first tube group 9A.
[0027]
Furthermore, in 3rd embodiment, as shown in FIG. 4, the inlet 29 which performs this regulation is formed by nozzles, such as a pipe, and it protrudes upwards toward the lower part of the pipe | tube 11 of 9 A of 1st pipe groups. it can.
[0028]
That is, as shown in the drawing, this pipe passes through the bottom plate of the double structure of the lower surface portion 13B of the tube wall 13 from the rare absorbent inflow box 27, and the first pipe is formed inside the lower surface portion 13B of the tube wall 13. It protrudes toward the lower part of each pipe | tube 11 of group 9A. Due to this protrusion, the rare absorbing liquid that flows in vigorously by the pump pressure is introduced only into the lower portion of the first tube group 9A, and the inflow to the tube wall 13 is restricted. From this, the formation of the flow of the rare absorbent as a whole becomes more remarkable.
[0029]
【The invention's effect】
As described above, according to the invention of claim 1 , the dilute absorbent is passed through the third tube group to recover the exhaust gas heat and preheated to reach the boiling start temperature or to the boiling start temperature. after becoming close enough temperature by flowing from the lower portion of the first tube bank, with attached flow of dilute absorbent solution in the first tube bank momentum, because as possible out actively the flow of dilute absorbent liquid by boiling, the heat transfer The coefficient can be increased, and local high temperatures such as the tube group and the pipe wall can be avoided, and inconveniences such as corrosion accidents and liquid crystallization caused by this high temperature can be prevented.
[0030]
Furthermore, in the invention of claim 2, 3, 4 or 5, when the rare absorbent is introduced from the lower part of the first pipe group, it is mainly introduced and introduced into the lower part of the first pipe group by the introduction structure . Since the rare absorbent does not flow into the second tube group due to the action of the separator provided inside the tube wall, it encourages the flow of the rare absorbent in the first tube group and positively promotes the upward flow in the first tube group. and the flow of dilute absorbent solution more active as a whole out making the can prevent high local temperatures of.
[Brief description of the drawings]
FIG. 1 shows a main part of a high-temperature regenerator showing a first embodiment of the present invention,
(A) is a vertical sectional front view, (B) is a horizontal sectional view, and (C) is a vertical sectional side view.
FIG. 2 is a drawing curve diagram showing the effect of this embodiment;
(A) is a Duhring diagram in the high-temperature regenerator of FIG. 5 as a comparative example, and (B) is a During diagram in the high-temperature regenerator of FIG. 1 showing this embodiment.
FIG. 3 shows a main part of a high-temperature regenerator showing a second embodiment of the present invention,
(A) is a vertical sectional front view, (B) is a horizontal sectional view, and (C) is a vertical sectional side view.
FIG. 4 is a partially enlarged longitudinal sectional view showing a main part of a third embodiment of the present invention.
FIG. 5 is a diagram showing a main part of a high temperature regenerator as a comparative example of the present invention;
(A) is a vertical sectional front view, (B) is a horizontal sectional view, and (C) is a vertical sectional side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High temperature regenerator 3 Gas 5 Air 7 Flat plate combustion surface 9 Vertical liquid pipe group 9A 1st pipe group 9B 2nd pipe group 9C 3rd pipe group 13 Tube wall 17 Fin 19 Separator 23 Bypass pipe 27 Rare absorption liquid inflow box 29 Rare Absorption liquid inlet

Claims (5)

Combustion flames and combustion gases from the combustion section, such as by a flat plate combustion surface in the vertical direction, are passed through the furnace wall in the horizontal direction and discharged from the chimney connection port, and a double structure arranged at the position of the furnace wall. In a high-temperature regenerator of an absorption refrigerating machine that heats and concentrates a dilute absorption liquid through the pipe wall through a vertical liquid pipe group consisting of a number of vertical pipes communicated with the upper and lower parts of the pipe wall ,
The vertical liquid pipe group, the first tube bank close to the combustion section, said from the combustion section first tubular distant second tube bank from the group, the second tube bank Home far the chimney from the combustion unit provided on the side of the connection port and divided into the third tube bank to recover flue gas heat flows from a lower portion of said first tube bank and said dilute absorbent liquid was preheated through the third tube bank that By virtue of the above , a high-temperature regenerator characterized by energizing the flow of the diluted absorbent in the first tube group . Combustion flames and combustion gases from the combustion section, such as by a flat plate combustion surface in the vertical direction, are passed through the furnace wall in the horizontal direction and discharged from the chimney connection port, and a double structure arranged at the position of the furnace wall. In a high-temperature regenerator of an absorption refrigerating machine that heats and concentrates a dilute absorption liquid through the pipe wall through a vertical liquid pipe group consisting of a number of vertical pipes communicated with the upper and lower parts of the pipe wall,
Among the vertical tube groups, a predetermined tube group close to the combustion unit is a first tube group, a predetermined tube group far from the first tube group from the combustion unit is a second tube group, and inside the tube wall By providing a separator that separates the first tube group and the second tube group, and providing an introduction structure that introduces the diluted absorbent pressurized by a pump mainly only in the lower part of the first tube group, A high-temperature regenerator characterized by energizing the flow of the diluted absorbent in one tube group. The introduction structure, characterized by positioning only the dilute absorbent liquid without position the inflow box at the bottom of the lower surface portion having no said first tube bank, the lower portion of said first tube bank for the introduction The high-temperature regenerator according to claim 2. The introduction structure, the inlet for the introduction which is more disposed to a position corresponding to the bottom of each tube of the first tube group, the inner diameter of the inlet to be smaller than the inner diameter of each tube The high temperature regenerator according to claim 2. High temperature generator according to claim 4, characterized in that protrude toward the inlet at the bottom of each tube.

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