JPH10238705A - Liquid tube convection type combustion heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contemplate not only an improved fuel consumption but also a smaller size of the apparatus with a higher heating efficiency by a method wherein a flame forming surface of a planar flame type burner is made smaller than the section of a heating chamber in the direction at the right angle to the passage of a combustion gas and liquid tubes positioned several rows ahead of the burner in front thereof are interlinked to build a baffle plate. SOLUTION: A flame 28 forming surface of a planar flame type burner 2A is 60% or less of the sectional area of a heating chamber 52 in the direction at the right angle to the passage of a combustion gas. Liquid tubes 56 in the second row from the side of a porous planar refractory block 73, that is, three liquid tubes 56 at the central part among those 56 the farthest from the porous planar refractory block 73 out of the liquid tubes 56 in the group of the upstream side liquid tubes 56A are linked sequentially over the overall length thereof by two slender partitions 62 to form a baffle plate member 63 against the flame 28 and the combustion gas in front of the porous planar refractory block 73. This enables effectively heating of a diluted liquid 22 in the liquid tubes 56 to improve the heating efficiency thereby achieving a miniaturization of the apparatus along with a higher fuel consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid heating device such as a high-temperature regenerator in an absorption refrigerator (including a device called an absorption chiller / heater).

[0002]

2. Description of the Related Art For example, an absorption refrigerator having a structure shown in FIG. 5 is well known. In the figure, reference numeral 1 denotes a high-temperature regenerator that includes a combustion device 2 such as gas or kerosene, generates refrigerant vapor 24 by heating a dilute liquid 22 of an absorbing liquid, and concentrates it into an intermediate liquid 23;
3 is a low-temperature regenerator that heats and concentrates the intermediate liquid with the refrigerant vapor from the high-temperature regenerator to make it a concentrated liquid. 4 is a condenser that cools and condenses the refrigerant vapor from the low-temperature regenerator. 5 is a refrigerant sprayer. 5
An evaporator for spraying / dropping the refrigerant liquid from A to evaporate,
Reference numeral 6 denotes an absorber for absorbing the refrigerant vapor from the evaporator into the concentrated liquid from the low-temperature regenerator 3 to maintain the inside of the device at a low pressure. Reference numerals 7 and 8 denote low-temperature and high-temperature heat exchangers. The pipes 9 to 12 are connected by refrigerant pipes 13 to 16 to form a circulation cycle of the refrigerant and the absorbing liquid, and either cold water or hot water selectively extracted from the heat exchanger 17 provided inside the evaporator 5 is provided. , Can be circulated and supplied to a heat load (not shown).

[0003] P1 is an absorption liquid pump provided in the absorption liquid pipe 9 for supplying the dilute liquid from the absorber 6 to the high temperature regenerator 1. P2 is provided in the refrigerant pipe 16 and provided at the bottom of the evaporator 5. A refrigerant pump for spraying the accumulated refrigerant liquid from the refrigerant sprayer 5A installed on the upper portion onto the heat exchanger 17;
V2 and V2 are cooling / warming switching valves provided in the absorbent pipe 11 and the refrigerant pipe 14, and closed when cold water is taken out from the heat exchanger 17 and opened when hot water is taken out.

A cold / hot water pipe 18 circulates and supplies cold water or heated hot water cooled by the heat exchanger 17 to a heat load such as cooling / heating (not shown). A cold / hot water pump P3 is attached to the inlet side.

[0005] Also, 19 and 20 are coolers provided inside the condenser 4 and the absorber 6, which are connected by a cooling water pipe 21 having a cooling water pump P4, and a cooling tower (not shown) and the absorber 6 The cooling water is circulated between the cooling water and the condenser 4.

[0006] In the absorption chiller having the above configuration, during the cooling operation in which chilled water is taken out, an absorption refrigeration cycle is performed by circulating the refrigerant and the absorption liquid, so that the latent heat of evaporation of the refrigerant in the evaporator 5 causes the heat in the heat exchanger 17 to be removed. Water can be cooled and supplied to about 6 to 8 ° C., and during the heating operation in which hot water is taken out, the supply of the cooling water to the coolers 19 and 20 is stopped while the on-off valves V1 and V2 are closed. By switching to open, the high-temperature absorbing liquid and refrigerant vapor
1. The refrigerant flows into the absorber 6 and the evaporator 5 from the high-temperature regenerator 1 via the refrigerant pipes 13 and 14, and the hot water heated by the heat exchanger 17 by the latent heat of condensation of the refrigerant and the sensible heat of the absorbing liquid is supplied. .

Since the high-temperature regenerator 1 occupies a large part in both the weight and the volume of the absorption refrigerator, the miniaturization of the high-temperature regenerator 1 is indispensable in order to reduce the overall size of the absorption refrigerator. It is. Further, as an environmental problem in the high-temperature regenerator 1, a demand for lowering NOx during combustion has been increasing.

However, the conventional high-temperature regenerator 1 disclosed in JP-A-63-294467 and JP-A-6-221718 has a liquid tube boiler structure as shown in FIG. It was difficult to reduce the size.

That is, the combustion device 2 in this case is a nozzle type burner that burns the mixed gas 27 of the fuel gas 25 and the air 26 in the combustion chamber 51 provided at the tip side of the nozzle 71. The flame 28 and the high-temperature combustion gas (not shown) are supplied to the inner wall 5 of a container 50 surrounding a combustion chamber 51 and a heating chamber 52 connected to the downstream side of the combustion chamber 51.
4 and a large number of liquid tubes 56 erected in the heating chamber 52 and then discharged from the exhaust port 53 as exhaust gas.

Then, the diluted liquid 22 of the absorbing liquid supplied from the absorber 6 flows into the container 50 from the absorbing liquid pipe 9, and the horizontal lower communication portion 57A, that is, the inner wall 54 and the outer wall 5
5, a horizontal upper communication portion 57B, that is, an upper clearance between the inner wall 54 and the outer wall 55, and a vertical communication portion 57C, that is, both sides between the inner wall 54 and the outer wall 55. It is stored in the gap and the inside of the plurality of liquid pipes 56 communicating with the horizontal communication portions 57A and 57B, and is heated by the flame 28 and the combustion gas while convection in the container, and is located above the horizontal upper communication portion 57B. The refrigerant vapor 24 evaporated into the gaseous phase portion 59 is discharged from the refrigerant pipe 13 and the refrigerant vapor 2
The intermediate liquid 23 having a high concentration due to evaporation of the liquid 4 flows out to the absorbing liquid pipe 10. In addition, since the refrigerant vapor 24 immediately after evaporation contains a droplet-like absorbing liquid component, the refrigerant vapor 24 is allowed to flow out to the refrigerant pipe 13 by bypassing the outflow path with the bypass plate 60. ing.

Therefore, in the high-temperature regenerator 1 having the above-described structure, since the combustion device 2 is a nozzle type burner, the flame 28
And the liquid tube 56 through which the dilute solution 22 flows is in direct contact with the flame 28, so that the dilute solution 22 is partially heated and crystallized. It is necessary to provide the combustion chamber 51 in front of the heating chamber 52 for reasons such as that the combustion chamber 51 is easily corroded, or the flame is cooled and unburned gas remains, and it is difficult to reduce the size. there were.

In Japanese Patent Application Laid-Open No. 63-294467, the combustion chamber 51 and the heating chamber 52 are formed in a folded shape, and the liquid pipe 56 is arranged on the folded side path.
There is disclosed a configuration in which a heat absorbing fin 56F is provided in the liquid pipe 56 located behind the path in order to improve heat absorption. In Japanese Patent Application Laid-Open No. Hei 6-221718, the liquid pipe 56 is connected to the heating chamber 52.
And a heat absorbing fin is provided on the rear side of the flat liquid tube 56, which is remarkable for miniaturization. Effect has not yet been achieved.

On the other hand, the gas-fired heating furnace is not provided with a combustion chamber 51 but provided with a flat combustion surface, etc. The loess tube-branch system has been introduced recently. In this furnace tubeless tube group system, the flame 28 and the combustion gas generated by the planar flame type burner 2A as shown in FIG. 4 are directly led to the heating chamber 52, and a combustion chamber is required. Not only dramatically reduces size,
It has also succeeded in reducing NOx.

That is, in the planar flame type burner 2A, the mixed gas 27 in which the fuel gas and the air containing the amount of oxygen necessary for combustion are mixed is supplied to the mixed gas chamber 72,
The flame 28 is designed to burn through the conducting hole 74 of the multi-hole planar refractory block 73 and to burn in a plane.
Is formed on the outer combustion surface 75, so that the combustion chamber 51 is not required, and the high-temperature regenerator 1 is significantly reduced in size.

The multi-hole planar refractory block 73 is formed mainly of a thick plate-like refractory material, for example, ceramic or metal fiber provided with a large number of fine conductive holes 74 as shown in the figure. . Reference numeral 76 denotes a small burner for ignition, and reference numeral 28a denotes a flame formed by the small burner for ignition.

[0016]

However, in a high-temperature regenerator provided with a planar flame type burner in which the thermal power is increased to further reduce the size, a flame forming surface of the planar flame type burner is used to reduce the combustion gas. Although it can be smaller than the cross-sectional area of the heating chamber in the direction perpendicular to the passage direction, in a configuration in which the combustion chamber is formed e.g. vertically and a planar flame type burner is installed on the front upper part thereof, the flame is formed on the upper side of the heating chamber. On the other hand, since the high temperature combustion gas is exhausted mainly through the upper part of the heating chamber, the heating effect is small at the lower part of the liquid pipe, and the effect of heating the absorbing liquid as a whole is reduced. There was a problem, and solving this point was an issue.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and has a large number of liquid pipes which communicate with upper and lower horizontal communicating portions to enable convection. A planar flame-type burner is installed facing the heating chamber which is erected from each other, and the high-temperature combustion gas generated by the planar flame-type burner passes through the heating chamber, and mainly through the liquid pipe wall. In a liquid tube convection type combustion heating furnace that heats the liquid in the furnace by heating,

The flame forming surface of the planar flame type burner is smaller than the cross section of the heating chamber in a direction perpendicular to the direction in which the combustion gas passes, and the liquid pipes several rows ahead of the planar flame type burner are connected in front of the planar flame type burner. A liquid-tube convection-type combustion heating furnace having a first configuration connected to provide a baffle plate;

In the liquid tube convection type combustion heating furnace of the first configuration, the flame forming surface of the planar flame type burner is 60% or less of the cross sectional area of the heating chamber in a direction perpendicular to the direction of passage of the combustion gas. A liquid tube convection-type combustion heating furnace having a second configuration,

In the liquid tube convection type combustion heating furnace of the first or second configuration, the planar flame type burner is installed horizontally facing the upper front of the heating chamber, and the baffle plate is provided only on the upper side of the liquid tube. By providing a liquid tube convection type combustion heating furnace having a third configuration to be installed, the above-mentioned problem of the prior art is solved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In addition, in order to facilitate understanding, in these figures, parts having the same functions as those described in FIGS. 5 to 7 are denoted by the same reference numerals.

[First Embodiment] The first embodiment is shown in FIG.
2. Referring to FIG. 2, reference numeral 61 in the figure denotes a burner installation opening formed at the front portions (denoted as 54 (A) and 55 (A)) of the inner wall 54 and the outer wall 55, respectively.
The burner installation opening has a width W1 of a width W2 of the front part of the heating chamber 52 (since the width of the heating chamber 52 is the same as that of the rear part of the front part, in FIG. 1, reference numeral W2 is given to the rear part).
60% or less, for example, 50% of the height H1
Is formed to be the same as the height H2 of the front part of the heating chamber 52 (the height of the heating chamber 52 is also the same as the rear part of the front part, and therefore, in FIG. 2, reference numeral H2 is attached to the rear part). ing.

The burner installation port 61 is connected to the heating chamber 5
4 are provided at positions equidistant from side portions (referred to as 54 (B)) of the inner wall 54 located on both sides of the inner wall 4.

The planar flame type burner 2A having the multi-hole planar refractory block 73 formed slightly smaller than the burner installation port 61 and having the configuration described with reference to FIG. Have been.

The liquid pipe 56 erected in the heating chamber 52 is
An upstream liquid pipe group 56A located upstream and downstream of the combustion promoting space 52A where no liquid pipe 56 is provided upright, that is, on the side of the multi-hole planar refractory block 73 forming the flame 28.
And a downstream liquid pipe group 56B located on the side of the exhaust port 53, and are staggered.

Then, the liquid pipe 56 of the upstream liquid pipe group 56A
Is formed thicker than the liquid tube 56 of the downstream liquid tube group 56B so that the diluted liquid 22 in the liquid tube 56 is not overheated and decomposed even if it is directly heated by the flame 28.

The multi-hole planar refractory block 73 is also
The liquid tubes 56 in the row, that is, the upstream liquid tube group 56 in this case
The three liquid pipes 56 at the center of the liquid pipes 56 farthest from the multi-hole planar refractory block 73 in the liquid pipes 56 of FIG.
Are connected in sequence over the entire length thereof by elongated strips 62, and baffle members 63 for the flame 28 and the combustion gas.
Are formed in front of the multi-hole planar refractory block 73.

Therefore, in the high temperature regenerator 1 having the above-described structure, the flame 28 and the combustion gas are bent toward the inner wall side portion 54 (B) by the baffle plate member 63, so that the flame 28 and the combustion gas are erected at the center of the heating chamber 52. Not only is the diluted liquid 22 in the liquid tube 56 heated effectively, but also the diluted liquid 22 in the liquid tube 56 erected on the side of the vertical side communication portion 57C and the inner wall side portion 54 (B) is removed. The effect of heating is enhanced, and the overall heating efficiency is also improved.

In the high-temperature regenerator 1 having the above-described structure, the flame 28 and the combustion gas exchange heat with the dilute liquid 22 in the thick liquid pipe 56 of the upstream liquid pipe group 56A, thereby rapidly lowering the temperature. , NO _X in the exhaust gas is significantly reduced. Moreover, the temperature until cooled combustion gas is effective in the NO _X reduction is so passes through the combustion promotion space 52A to the liquid pipe 56 is not erected even one, the temperature of the combustion gas in this portion hardly lowered When passing through this, the combustion reaction proceeds, and the CO gas concentration in the waste gas also decreases.

[Second Embodiment] The second embodiment is shown in FIG.
4 will be described with reference to FIG. 4. In this case, the burner installation port 61 includes the inner wall front portion 54 (A) and the outer wall front portion 55.
In the upper part of (A), the width W1 is the same as the width W2 of the front part of the heating chamber 52, and the height H1 is 60% or less, for example, 50% of the height H2 of the front part of the heating chamber 52. In this burner installation port 61, the same flame-type burner 2A as used in the first embodiment is installed.

In this case as well, the liquid pipe 56 erected in the heating chamber 52 is located upstream and downstream of the combustion promoting space 52A where no liquid pipe 56 is erected, ie, on the side of the multi-hole planar refractory block 73. , And a downstream liquid tube group 56B located on the side of the exhaust port 53 are staggered.

Here, too, the liquid pipe 56 of the upstream liquid pipe group 56A
Is formed thicker than the liquid tube 56 of the downstream liquid tube group 56B so that the diluted liquid 22 in the liquid tube 56 is not overheated and decomposed even if it is directly heated by the flame 28.

Then, the upper sides of all the liquid pipes 56 in the second and third rows from the multi-hole planar refractory block 73 side of the liquid pipes 56 of the upstream liquid pipe group 56A are plural (four sheets in the figure). ) Are sequentially connected by a partition plate 62, and a baffle plate member 63 for the flame 28 and the combustion gas is formed in front of the multi-hole planar refractory block 73.

Therefore, in the high-temperature regenerator 1 of this configuration, the planar flame-type burner 2A is installed facing the upper front of the heating chamber 52, but the flame 28 and the combustion gas are directed downward by the baffle plate 63. Since the bent portions are bent, not only the dilute solution 22 on the upper side of the vertical lateral communication portion 57C and the liquid tube 56 is effectively heated, but also the action of heating the dilute solution 22 on each lower side is enhanced. Also, the overall heating efficiency is improved.

Also in the high temperature regenerator 1 having this configuration, the flame 28 and the combustion gas exchange heat with the dilute liquid 22 in the large liquid pipe 56 of the upstream liquid pipe group 56A, so that the temperature is quickly lowered. , NO _X in the exhaust gas is significantly reduced. Moreover, the temperature until cooled combustion gas is effective in the NO _X reduction is so passes through the combustion promotion space 52A to the liquid pipe 56 is not erected even one, the temperature of the combustion gas in this portion hardly lowered When passing through this, the combustion reaction proceeds, and the CO gas concentration in the waste gas also decreases.

The liquid pipes 56 of the upstream liquid pipe group 56A are 5-6.
Can be increased to about a row. Then, the liquid tubes 56 in the row farthest from the planar flame type burner 2A are sequentially connected by a partition plate 62, and a baffle plate member 63 is installed in front of the planar flame type burner 2A or located at an intermediate portion thereof. Row of liquid tubes 5
6 are not connected sequentially by the partition plate 62 to install the baffle plate member 63, or the liquid tubes 56 are not connected to each other, but the wide partition plate 62 is installed between the liquid tubes 56, and the partition plate itself is It is also possible to use a baffle. The partition plate 62 may be provided with a through hole.

[0037]

As described above, in the liquid tube convection type combustion heating furnace according to the present invention, the liquid can be uniformly heated not only in front of the burner but also in the entire heating chamber. Therefore, the heating efficiency is improved, thereby improving the fuel efficiency and reducing the size of the device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first embodiment in a cross section.

FIG. 2 is an explanatory diagram showing the first embodiment in a longitudinal section.

FIG. 3 is an explanatory diagram showing a second embodiment in a cross section.

FIG. 4 is an explanatory view showing a second embodiment in a longitudinal section.

FIG. 5 is an explanatory view of an absorption refrigerator.

FIG. 6 is an explanatory diagram of a heating device.

7A and 7B are explanatory views showing a conventional technique, in which FIG. 7A is a longitudinal sectional view, FIG. 7B is a transverse sectional view, and FIG. 7C is a longitudinal sectional side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Combustion device 2A Plane flame type burner 3 Low temperature regenerator 4 Condenser 5 Evaporator 6 Absorber 7 Low temperature heat exchanger 8 High temperature heat exchanger 9-12 Absorbent pipe 13-16 Refrigerant pipe 17 Heat exchange Apparatus 18 Cold / hot water pipe 19/20 Cooler 21 Cooling water pipe 22 Rare liquid 23 Intermediate liquid 24 Refrigerant vapor 25 Fuel gas 26 Air 27 Mixed gas 28 / 28a Flame 50 Container 51 Combustion chamber 52 Heating chamber 52A Combustion promoting space 53 Exhaust port 54 Inner wall 54 (A) Inner wall front part 54 (B) Inner wall side part 55 Outer wall 55 (A) Outer wall front part 55 (B) Outer wall front part 56 Liquid pipe 56A Upstream liquid pipe group 56B Downstream liquid pipe group 57A Horizontal Lower communication part 57B Horizontal upper communication part 57C Vertical side communication part 58 Steam discharge port 59 Gas phase part 60 Detour plate 61 Burner installation port 62 Partition plate 63 Plate member 71 Nozzle 72 Mixed gas chamber 73 Multi-hole planar refractory block 74 Guide hole 75 Burning surface 76 Small burner for ignition H1 Height of burner installation port H2 Height of heating chamber P1 Absorbent liquid pump P2 Refrigerant pump P3 Cold / hot water pump P4 Cooling water pump V1, V2 On-off valve W1 Width of burner installation port W2 Width of heating chamber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F25B 33/00 F25B 33/00 Z

Claims (3)

[Claims] A planar flame-type burner is installed facing a heating chamber in which a plurality of liquid pipes that communicate with each other and allow horizontal convection by forming upper and lower horizontal communication sections are separated from each other. A liquid-tube convection-type combustion heating furnace in which high-temperature combustion gas generated by the planar flame-type burner passes through a heating chamber and heats liquid in the furnace mainly through a liquid-tube wall. The flame forming surface of the flame-shaped burner is smaller than the cross section of the heating chamber in the direction perpendicular to the direction of the passage of the combustion gas, and the liquid pipes several rows ahead of the flame-shaped burner are connected in front of the flame-shaped burner and obstructed. A liquid tube convection type combustion heating furnace characterized by having a plate. 2. The convective combustion in a liquid tube according to claim 1, wherein the flame forming surface of the planar flame type burner is 60% or less of a sectional area of a heating chamber in a direction perpendicular to a direction in which the combustion gas passes. heating furnace. 3. The liquid according to claim 1, wherein the planar flame type burner is installed horizontally facing the upper front of the heating chamber, and the baffle is installed only on the upper side of the liquid pipe. Tube convection type combustion heating furnace.