JP2006220344A - High-temperature regenerator of absorption type refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the quantity of NOx included in an exhaust gas without limited by a type of a used burner, the shape of a fire door or the like. <P>SOLUTION: In this high-temperature regenerator, an oxidation catalyst agent 13 is put on an inner wall face where temperature rise in combustion is controlled to about 300-400°C as an adsorbent is placed at an opposite side, of a furnace 12 communicating with a burner mounting portion 18 surrounded by a flange 17 comprising a plurality of screw holes 16, at its front end side and communicating with the rear end side of a flue 15 through a furnace return chamber not shown in Figure, at its rear end side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-temperature regenerator of an absorption refrigerator (including an absorption chiller / heater) equipped with a burner as absorption liquid heating means.

In this type of apparatus, for example, as shown in FIG. 3, a surface combustion plate 41 having a fast completion of combustion is used as the absorbing liquid heating means, and a longitudinal sectional area of a part of the combustion chamber 12A from the surface combustion plate 41 to the downstream side. In order to reduce the nitrogen oxide (NOx) contained in the exhaust gas, it is possible to avoid the abnormal temperature rise of the pipe wall by passing the absorbing liquid between the pipe walls. The high temperature regenerator 100X is well known (for example, see Patent Document 1). In the figure, reference numeral 40 denotes an air-fuel mixture chamber in which fuel and combustion air are mixed, and reference numeral 14 denotes a transparent liquid pipe provided upright in the combustion chamber 12A so that the absorbing liquid can enter and exit.
JP-A-10-197100

  However, the above-described prior art has a problem that it uses a surface combustion burner that completes combustion quickly and that the spout needs to have a specific shape. Therefore, there is no limitation on the type of burner to be used, the shape of the nozzle, and the like, and it is necessary to be able to reduce the amount of NOx contained in the exhaust gas.

  The present invention relates to a high temperature regenerator of an absorption refrigerating machine in which a burner is provided as an absorbing liquid heating means, in which a fuel jetted from the burner burns and a combustion gas generated by the combustion is guided to an exhaust port. This is a high temperature regenerator mainly characterized in that an oxidation catalyst is disposed on the inner wall surface.

  In the present invention, a combustion reaction occurs with a part of fuel such as gas or oil ejected from a burner by an oxidation catalyst disposed on the inner wall surface of the furnace tube which becomes a relatively low temperature of about 300 to 400 ° C. during combustion. The initial gas oxidation reaction is promoted in the low temperature region, and the generation of NOx is suppressed.

  In a high-temperature regenerator of an absorption refrigeration machine to which a burner is attached as an absorbing liquid heating means, fuel injected from the burner burns, and Pt is formed on the inner wall surface of the furnace tube that guides the combustion gas generated by the combustion to the exhaust port. A high-temperature regenerator characterized in that a system oxidation catalyst is disposed.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In order to facilitate understanding, in these drawings, parts having the same functions as those described with reference to FIG.

  In the high-temperature regenerator 100 of the present invention, the absorption liquid is heated and boiled by the combustion heat generated when a fuel such as gas or oil ejected from a burner (not shown) attached to the front side is burned, and from the absorption liquid. The main body 10 having a function of separating and generating the refrigerant vapor and concentrating and regenerating the absorbing liquid so that the refrigerant can be absorbed is disposed in the outer shell 11 and a furnace cylinder 12 which is laterally disposed inside and forms a combustion chamber 12A. And.

  The furnace tube 12 is horizontally placed in the lower part on the inner side of the outer shell 11 so as to allow the absorbent to flow by a predetermined distance from the outer shell 11, and the temperature at the center is 1000 ° C. due to the combustion heat of the fuel ejected from the burner. During the operation that rises to the front and rear, the oxidation catalyst agent 13 such as a Pt-based oxidation catalyst is placed on the inner wall surface of the furnace tube 12 where the rising temperature is suppressed to about 300 to 400 ° C. because the absorbent is on the opposite side, for example, 30 to It is applied to a thickness of 50 μm.

  In order to effectively reduce NOx in the exhaust gas, the oxidation catalyst agent 13 is desirably provided with a thickness of at least several μm or more based on the combustion temperature in the furnace tube 12. In order to prevent damage such as cracking of the oxidized catalyst agent, it is desirable that the coating thickness be several hundred μm or less.

  In the middle part of the outer shell 11 above the furnace tube 12, a flue 15 in which a large number of liquid tubes 14 are erected is provided in the front-rear direction, similar to the furnace tube 12.

  The front end side of the furnace tube 12 communicates with a burner mounting port 18 formed by a flange 17 having a plurality of screw holes 16, and the rear end side is the rear end of the flue 15 via the furnace tube return chamber 15A. It communicates with the side. In addition, the front end side of the flue 15 communicates with the chimney 20 via the smoke chamber 19.

  21 is an absorption liquid pipe. One end of the absorption liquid pipe 21 is connected to an absorption liquid reservoir of an absorber (not shown), and the other end passes through the outer shell 11 and opens above the numerous liquid pipes 14. The absorption liquid concentration unit 22 surrounded by the outer shell 11 of the main body 10 is activated by the activation of the absorption liquid pump (not shown) interposed in the absorption liquid pipe 21 by absorbing the rare absorption liquid whose absorption liquid concentration has decreased. Can be supplied.

  A bottomless refrigerant vapor collection box 24 to which a refrigerant vapor pipe 23 is connected is placed on the top of the outer shell 11, and refrigerant vapor generated by evaporating and separating from the absorbing liquid in the absorbing liquid concentrating part 22 is collected here. Thus, it can be supplied to a low-temperature regenerator (not shown) or the like via the refrigerant vapor pipe 23.

  An absorption liquid outlet box 26 having an absorption liquid pipe 25 connected to the bottom is attached to one side surface on the upper side of the outer shell 11 and heated by the absorption liquid concentration section 22 to evaporate and separate the refrigerant to be concentrated. The absorption liquid flows into the absorption liquid outlet box 26 and can be supplied to the low temperature regenerator or the like via the absorption liquid pipe 25.

  The interior of the absorption liquid outlet box 26 communicates with the absorption liquid concentration unit 22 surrounded by the outer shell 11 via a dam (not shown) whose upper end is positioned higher than the upper end of the liquid pipe 14. It is provided to do.

  Therefore, the liquid level of the absorption liquid supplied through the absorption liquid pipe 21 and stored in the absorption liquid concentration part 22 surrounded by the outer shell 11 is higher than the upper end part of the liquid pipe 14. However, since the absorption liquid of the absorption liquid concentration part 22 flows over the weir and flows into the absorption liquid outlet box 26, the absorption liquid concentration part 22 is positioned on the upper side of the absorption liquid storage part 22A on the lower side where the absorption liquid is stored. And a refrigerant vapor storage portion 22B in which refrigerant vapor evaporated and separated from the absorbing liquid is accumulated.

  When a burner (not shown) is attached to the burner attachment port 18 using the screw hole 16 of the flange 17 and the fuel ejected from the burner is burned in the combustion chamber 12A in the furnace tube 12, the temperature at the center becomes 1000 ° C. The high-temperature combustion gas that is also in the front and rear is guided by the furnace cylinder 12 to reach the flue 15, dissipates heat to the absorbing liquid in a number of liquid pipes 14 standing there, and passes through the smoke chamber 19 and the chimney 20. And exhausted.

  That is, the absorbent in the absorbent reservoir 22A of the main body 10 is heated by the combustion heat through the wall surface of the furnace tube 12 and the tube wall of the liquid pipe 14. Therefore, the absorption liquid in the absorption liquid storage section 22 </ b> A rises in the liquid pipe 14 where the temperature is high, and causes convection that descends in the gap between the side wall portion of the outer shell 11 and the furnace tube 12, where the temperature is relatively low. While being heated, the refrigerant is evaporated and separated, concentrated and flows out to the absorption liquid outlet box 26, and is supplied from the absorption liquid pipe 25 to a low-temperature regenerator or the like.

  On the other hand, the refrigerant vapor generated by evaporating and separating from the absorbent in the absorbent reservoir 22A of the main body 10 is accumulated in the refrigerant vapor reservoir 22B and collected in the refrigerant vapor collection box 24. Supplied to a regenerator or the like.

  In the high-temperature regenerator 100 of the present invention, the Pt-based oxidation catalyst agent 13 is disposed on the inner wall surface of the furnace tube 12 that becomes a relatively low temperature of about 300 to 400 ° C. during combustion. Since the oxidation reaction of a part of the fuel ejected from the burner and the gas at the early stage of the combustion reaction is promoted in the low temperature region, the generation of NOx is suppressed.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit described in the claims.

  For example, the oxidation catalyst agent 13 disposed on the inner wall surface of the furnace tube 12 is downstream from the portion facing the flame formed when the fuel oil is burned by the burner attached to the burner attachment port 18 of the furnace tube 12. You may make it arrange | position only to.

It is a perspective explanatory view of the high-temperature regenerator of the present invention shown partially broken. It is explanatory drawing which looked at the high temperature regenerator of this invention from the front. It is explanatory drawing which shows a prior art, (A) is a cross-sectional view, (B) is a longitudinal cross-sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main-body part 11 Outer shell 12 Furnace 12A Combustion chamber 12B Furnace return chamber 13 Oxidation catalyst agent 14 Liquid pipe 15 Flue 16 Screw hole 17 Flange 18 Burner attachment port 19 Chimney 20 Absorption liquid pipe 22 Absorption liquid concentration part 22A Absorption liquid storage part 22B Refrigerant vapor storage part 23 Refrigerant vapor pipe 24 Refrigerant vapor collection box 25 Absorption liquid pipe 26 Absorption liquid outlet box 100, 100X High temperature regenerator

Claims (2)

  In a high-temperature regenerator of an absorption refrigeration machine equipped with a burner as absorption liquid heating means, the fuel ejected from the burner burns and oxidizes to the inner wall surface of the furnace tube that guides the combustion gas generated by the combustion to the exhaust port A high-temperature regenerator comprising a catalyst.   The high-temperature regenerator according to claim 1, wherein the oxidation catalyst disposed on the inner wall surface of the furnace tube is a Pt-based oxidation catalyst.

Images