JPH10253003A - Liquid tube convective type combustion heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the liquid in storage from being locally overheated even when a small type ignition burner and a flame detector capable of detecting the flame of the small type burner are set. SOLUTION: A planar flame-shaped burner 2A is placed in the upper, front part of a heating chamber 52. A small type ignition burner 76 and a flame detector 63 for detecting the flame 28a in the small type burner 76 are passed through an upper outer wall part 55(B), a horizontal upper communicating part 57B, and an upper inner wall part 54(B) from above the top side of the heating chamber 52 downward and in such a manner as to be positioned among liquid tubes 56 set in a row and as close to the planar flame-shaped burner 2A as possible.

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. 3 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 the above-mentioned conventional high-temperature regenerator, if the fluidity of the absorbing liquid contained therein is impaired by the installation of an ignition device or a flame detector, the absorbing liquid is locally localized. There is a disadvantage that overheating occurs and the concentration of the absorbing solution is increased in that part, and the corrosion of the furnace wall and the liquid tube progresses, and solving this point has been a problem.

[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 horizontally facing a heating chamber that is erected away from each other, and the high-temperature combustion gas generated by this planar flame-type burner passes through the heating chamber, and mainly the liquid pipe wall. In a liquid tube convection-type combustion heating furnace that heats the liquid in the furnace through

A planar flame type burner is installed facing the upper front of the heating chamber, and an ignition device for igniting the planar flame type burner and a flame detector for detecting the flame of the ignition device are heated. A liquid-tube convection-type combustion heating furnace having a first configuration, which is arranged so as to face the upper surface of the planar flame type burner side of the chamber;

In the liquid-tube convection-type combustion heating furnace of the first configuration, the ignition device and the flame detector are positioned so as to be located between the liquid tubes arranged closest to the planar flame burner. A liquid tube convection type combustion heating furnace of the second configuration installed;

In the liquid-tube convection-type combustion heating furnace of the second configuration, a front portion of the heating chamber is formed in a vertically long shape, and a planar flame type burner is installed over the entire front surface. By providing a liquid-tube convection-type combustion heating furnace having the above configuration, 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. Note that, in these figures, the same reference numerals are given to the portions having the same functions as those described in FIGS. 3 to 5 in order to facilitate understanding.

One embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the drawings, reference numeral 61 denotes a burner installation port formed in front of a heating chamber 52. The side end face of the burner installation port 61 is formed by the front part of the inner wall side part 54 (C) forming the vertical side communication part 57C together with the outer wall side part 55 (C), and the upper end face is the upper part. Formed at the front portion of the inner wall upper portion 54 (B) forming the communication portion 57B,
The lower end surface is an inner wall front portion 54 (D) / outer wall front portion extending upward from the front end of each of the inner wall lower portion 54 (A) and the outer wall lower portion 55 (A) forming the horizontal lower communication portion 57A. 55 (D) is formed by an end face plate 62 connecting the upper ends of each other.

The burner installation port 61 is provided with the planar flame type burner 2A having the structure described with reference to FIG.

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.

The liquid pipe 56 of the upstream liquid pipe group 56A is
The diluted liquid 2 in the liquid tube 56 even if heated directly by the liquid 8
2 is formed thicker than the liquid pipe 56 of the downstream liquid pipe group 56B so as not to be decomposed due to overheating.

The small ignition burner 76 is positioned between the liquid tubes 56 of the liquid tube row arranged closest to the planar flame type burner 2A in the upstream liquid tube group 56A.
And a flame detector 63 for detecting the flame 28a by the small burner 76 penetrates the outer wall upper portion 55 (B), the horizontal upper communication portion 57B, and the inner wall upper portion 54 (B) from above to below. , Facing the upper surface of the heating chamber 52.

As the small ignition burner 76, for example, a conventionally known pilot burner, which itself includes a discharge ignition device and a fuel supply pipe, can be appropriately selected and used. Conventionally known, for example, an ultraviolet ray detection type flame detector can be used, and any of them is welded to the upper portion 54 (B) of the inner wall from the liquid side of the horizontal upper communication portion 57B to eliminate the gap and prevent the corrosion of the gap. ing.

Further, since the small ignition burner 76 and the flame detector 63 are installed vertically through the wide horizontal upper communicating portion 57B, the rare liquid 22 stored inside the burner 76 and the flame detector 63 are disposed.
Can flow freely and has never been locally concentrated. For this reason, the corrosive rare liquid 22 is stored, but the furnace wall, the liquid tube, and the like do not corrode.

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.

It should be noted that the ignition small burner 76 and the flame detector 63 are provided in the upstream flame tube group 56A in the planar flame type burner 2.
A suitable liquid pipe 56 in the liquid pipe row to be arranged closest to A, for example, without installing the liquid pipe 56 in the center portion,
It is also possible to install so as to face this part.

The upstream liquid pipe group 56A, that is, the liquid pipe 56 provided upstream of the combustion promoting space 52A has 5-6 pipes.
Can be increased to about a row.

[0032]

As described above, in the liquid tube convection-type combustion heating furnace according to the present invention, the ignition device and the flame detector are installed vertically through the wide horizontal upper communicating portion, so that the internal The liquid stored in the tub can flow freely and is not locally heated.

For this reason, even if a corrosive absorbing liquid is stored, such as a high-temperature regenerator in an absorption refrigerator, if the concentration of the absorbing liquid is locally increased and the corrosion of the furnace wall and the liquid tube progresses. The inconvenience mentioned does not occur.

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory diagram of an absorption refrigerator.

FIG. 4 is an explanatory diagram of a heating device.

FIGS. 5A and 5B are explanatory views showing a conventional technique, wherein FIG. 5A is a longitudinal sectional view, FIG. 5B is a transverse sectional view, and FIG. 5C 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) Lower part of inner wall 54 (B) Upper part of inner wall 54 (C) Side part of inner wall 54 (D) Front part of inner wall 55 Outer wall 55 (A) Lower part of outer wall 55 (B) Upper part of outer wall 55 (C) ) Outer wall side portion 55 (D) Outer wall front portion 56 Liquid pipe 56A Upstream liquid pipe group 56B Downstream liquid pipe group 57A Horizontal lower communication section 57B Horizontal upper communication section 5 C Vertical side communication section 58 Steam discharge port 59 Gas phase section 60 Detour plate 61 Burner installation port 62 End face plate 63 Flame detector 71 Nozzle 72 Mixed gas chamber 73 Multi-hole planar refractory block 74 Guide hole 75 Burning surface 76 Ignition Small burner P1 Absorbent pump P2 Refrigerant pump P3 Cooling / hot water pump P4 Cooling water pump V1 / V2 open / close valve

Claims (3)

[Claims] 1. A planar flame-type burner is installed laterally facing a heating chamber in which a plurality of liquid pipes which communicate with each other and allow horizontal convection by forming upper and lower horizontal communication sections face each other. A liquid tube convection-type combustion heating furnace in which high-temperature combustion gas generated by the planar flame burner passes through a heating chamber and mainly heats liquid in the furnace through a liquid tube wall. A planar flame type burner is installed facing the upper front of the heating chamber, and an ignition device for igniting the planar flame type burner and a flame detector for detecting the flame of the ignition device are provided in the heating chamber. A liquid tube convection type combustion heating furnace which is installed facing the upper surface of a planar flame type burner. 2. An apparatus according to claim 1, wherein the ignition device and the flame detector are disposed so as to be located between the liquid tubes arranged closest to the planar flame type burner. Liquid tube convection type combustion heating furnace. 3. A front portion of the heating chamber is formed in a vertically long shape,
3. A convection type liquid tube combustion heating furnace according to claim 2, wherein a planar flame type burner is provided over the entire front surface.