JP2000257819A - Surface combustion burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably form a short flame on the surface of a surface combustion plate even when a heating power is made greater. SOLUTION: A mixed gas chamber 71 is divided into a plurality of small chambers 73 and a mixed gas supplying plate 49, on the front surface of which a multitude of through holes 51 are formed, is provided at the front surfaces of respective chambers, further, a surface combustion plate 75, equipped with a multitude of fine combustion holes not shown in a diagram, is provided at the fore side of the mixed gas supplying plate 49 while each one piece of branching tube 69 is connected to respective small chambers 73 to supply the mixed gas 65 of fuel and air to the small chambers 73, the back surface of the surface combustion plate 75 and the surface of the same sequentially and burn the mixed gas on the surface of the surface combustion plate 75.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a surface combustion burner provided in a high-temperature regenerator of an absorption refrigerator or the like.

[0002]

2. Description of the Related Art For example, in a conventional tube-burning type high-temperature regenerator, as described in Japanese Patent Application Laid-Open No. H10-197100, the flame or combustion gas of a burner is guided to an inner shell. The rare absorbing liquid flows between the outer shell and the absorbing liquid, and further flows through a group of liquid pipes that are piped vertically through the inner shell. The flowing rare absorbing liquid is heated by the burner's flame or combustion gas, and the absorbed refrigerant is separated as refrigerant vapor, the concentration of the absorbing liquid increases, and the absorbing liquid is regenerated. is there.

[0003] A burner for such an application has disadvantages such as unburned components being exhausted or dewed when the flame touches a liquid pipe having a low temperature. Some use a surface combustion plate that can be formed short.

In a burner using a surface combustion plate, if the pressure of the mixed gas chamber is increased to increase the amount of the mixed gas passing through the combustion holes, the flame blows off and disappears. It is necessary to enlarge the surface combustion plate.

[0005]

However, a burner having a large surface combustion plate has a problem that it is difficult to form a flame of a uniform size on the surface of the surface combustion plate. This was a problem to be solved.

[0006]

In order to solve the above problems, a first invention is to provide a plurality of branch pipes for branching and guiding a mixed gas of fuel and air, and a plurality of branch pipes arranged in parallel to each other. A mixed gas chamber having small chambers to which pipes are respectively connected, a mixed gas supply plate provided in front of each small chamber and having a plurality of through holes through which the mixed gas passes, and a mixed gas supply plate provided in front of the mixed gas supply plate A surface combustion plate formed with a plurality of combustion holes through which the mixed gas passes.

A second aspect of the present invention is a surface combustion burner characterized in that the mixed gas supply plate has the same opening area of the through-hole, and is provided with a pressure equalizing pipe communicating with each of the small chambers.

According to a third aspect of the present invention, an adjusting valve for adjusting the mixed gas pressure is provided in each branch pipe, and the pressure between the mixed gas supply plate and the surface combustion plate and the pressure in each small chamber are measured. It is a surface combustion burner provided with a pressure measuring means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 to 3 and FIG. First, referring to FIG. 6, the overall outline of the absorption refrigerator will be described. In the figure,
Reference numeral 1 denotes an evaporative absorber body (lower body).
Contains an evaporator 2 and an absorber 3. Reference numeral 4 denotes a high-temperature regenerator having a surface combustion burner 5. An absorbent pump P1, a low-temperature heat exchanger 7, and a high-temperature heat exchanger 8 are provided in the middle of the rare absorbent pipe 6 from the absorber 3 to the high-temperature regenerator 4.

Reference numeral 10 denotes a high temperature body (upper body), in which a low temperature regenerator 11 and a condenser 12 are housed. Reference numeral 13 denotes a refrigerant vapor pipe from the high-temperature regenerator 4 to the low-temperature regenerator 11, 16 denotes a refrigerant liquid flow-down pipe from the condenser 12 to the evaporator 2, 17 denotes a refrigerant circulation pipe connected to the evaporator 2, and P2. Is a refrigerant pump. Reference numeral 21 denotes a cold water pipe connected to the evaporator 2.

Reference numeral 22 denotes an intermediate absorption liquid pipe extending from the high-temperature regenerator 4 to the high-temperature heat exchanger 8, and reference numeral 23 denotes an intermediate absorption liquid pipe extending from the high-temperature heat exchanger 8 to the low-temperature regenerator 11. 25 is a low-temperature regenerator 1
Reference numeral 26 denotes a concentrated absorption liquid pipe from the low-temperature heat exchanger 7 to the absorber 3. 2
9 is a cooling water pipe.

During operation of the absorption refrigerator configured as described above, the surface combustion burner 5 of the high-temperature regenerator 4 burns, and the rare absorbing liquid flowing from the absorber 3 is heated. The diluted absorbing liquid is, for example, an absorbing liquid such as an aqueous solution of lithium bromide (LiBr) (including a surfactant) containing a large amount of a refrigerant such as water. This heating causes the rare absorbing liquid to boil,
Refrigerant vapor separates from the dilute absorbent. As a result, the rare absorbing solution is concentrated into an intermediate absorbing solution having a medium concentration.

The refrigerant vapor flows through the refrigerant vapor pipe 13 to the low-temperature regenerator 11. Then, the refrigerant liquid obtained by heating and condensing the intermediate absorbing liquid from the high-temperature regenerator 4 in the low-temperature regenerator 11 flows to the condenser 12. In the condenser 12, the refrigerant vapor flowing from the low-temperature regenerator 11 is cooled by the cooling water in the cooling water pipe 29 and condensed into a refrigerant liquid, and together with the refrigerant liquid flowing from the low-temperature regenerator 11, the evaporator 2. Flow down to

In the evaporator 2, the refrigerant liquid is sprayed by the spraying device 31 by the operation of the refrigerant pump P2. And
The chilled water pipe 21 cooled by the spraying to reduce the temperature
Of cold water is supplied to the load. The refrigerant vapor vaporized in the evaporator 2 flows to the absorber 3 and is absorbed by the concentrated absorbent to be sprayed.

On the other hand, the intermediate absorption liquid whose refrigerant concentration has decreased due to separation of the refrigerant vapor in the high-temperature regenerator 4 is supplied to the intermediate absorption liquid pipe 22,
The low-temperature regenerator 1 passes through the high-temperature heat exchanger 8 and the intermediate absorption liquid pipe 23.
Flow to 1. In the low-temperature regenerator 11, the intermediate absorbent is heated by the heater 14 in which the refrigerant vapor from the high-temperature regenerator 4 flows. Then, the refrigerant vapor is separated from the intermediate absorbing liquid, and the concentration of the absorbing liquid further rises to become a concentrated absorbing liquid.

The concentrated absorption liquid flows into the concentrated absorption liquid pipe 25, flows through the low-temperature heat exchanger 7 and the concentrated absorption liquid pipe 26 to the absorber 3, and drops from the spraying device 30 onto the cooling water pipe 29.
Then, the concentrated absorption liquid cooled by the cooling water pipe 29 is
The refrigerant vapor that enters through the evaporator 2 is well absorbed, and the refrigerant concentration becomes high, and becomes a rare absorbing liquid. The rare absorbing liquid is supplied to the low-temperature heat exchanger 7 by the driving force of the absorbing liquid pump P1.
And it is preheated by the high temperature heat exchanger 8 and flows into the high temperature regenerator 4.

The cooling water pipe 29 provided in such an absorption refrigerator is connected to, for example, a cooling tower (not shown) and is arranged so that cooling water circulates.

The fuel 33 taken in toward the surface combustion burner 5 and the air sent from the blower 35 are mixed and ignited to start combustion.

Next, a high-temperature regenerator 4 according to this embodiment is shown in FIGS. On one side of the high-temperature regenerator 4, a burner mounting port 41 for mounting the surface combustion burner 5 is provided, and on the other side, an exhaust gas outlet 43 from which combustion gas from the surface combustion burner 5 is discharged as exhaust gas.
Is formed.

The high-temperature regenerator 4 has an inner shell 45 and an outer shell 4.
7 has a double structure. The inner shell 45 is a portion through which the flame or the combustion gas of the surface combustion burner 5 is guided and has a shape in which a tubular section having a square cross section is placed horizontally. A surface combustion plate 75 of the surface combustion burner 5 is provided at the burner attachment port 41, and a number of fine combustion holes (not shown) are formed therein. This surface burning plate 75
In the vicinity of, there are provided an ignition means (not shown) for igniting a mixture of fuel and air, a sensor (not shown) for detecting a flame generated by the ignition, and the like.

An outer shell 47 is provided on the outer peripheral side of the inner shell 45.
Is arranged. A space 53 between the inner shell 45 and the outer shell 47 is sealed, and a spraying device 55 for distributing and spraying the diluted absorbing liquid is disposed in an upper space 53A of the sealed space 53. . This spraying device 55 is a main pipe 5
7 and a plurality of scatter pipes 59 extending right and left from the main pipe 57.
Consists of Further, a liquid tube group 63 composed of a number of liquid tubes 61 is disposed so as to penetrate the inner shell 45 vertically. The liquid tube group 63, the upper space 53A and the bottom space 5
It communicates with 3B.

FIG. 1 is an enlarged view of a surface combustion surface burner 5 which is a burner provided in the high temperature regenerator 4.
After the mixed gas 65 of fuel and air is guided to the spare gas chamber 67, it branches into a plurality of, for example, three branch pipes 69, and each branch pipe 69 is connected to the mixed gas chamber 71. This mixed gas chamber 7
In this case, 1 is in the form of a box that is elongated in the up-down direction, and is divided into three parts by a partition wall 72 and three small chambers 73.
To form The branch pipe 69 is connected to each of the small chambers 73 one by one.

A mixed gas supply plate 4 is provided in front of each small chamber 73.
9 is provided orthogonal to the flow direction of the mixed gas 65. A large number of through holes 51 are formed in the mixed gas supply plate 49. Further, in front of the mixed gas supply plate 49, a surface combustion plate 75 having a large number of fine combustion holes (not shown) is provided.

The size and number of the through holes 51 provided in the mixed gas supply plate 49 are determined in consideration of the pressure loss generated according to the length of the branch pipe 69, and the flow rate of the mixed gas blown out from each through hole 51 is considered. Are predetermined so as to be substantially the same.
Conversely, it is also possible to form the long branch pipe 69 thick and the short branch pipe 69 thin so that the pressure loss of the branch pipe 69 becomes the same, and make all the through holes 51 the same size. .

(Operation) In the surface combustion burner having the above structure, the mixed gas chamber 71 is divided into three small chambers 73, and the mixed gas 65 is supplied to each of the through holes 51 through the branch pipe 69.
From the surface combustion plate 75, the mixed gas 65 passing through the fine combustion holes (not shown) of the surface combustion plate 75 is almost the same at any part of the surface combustion plate 75, A flame of the same length is formed stably.

(Other Embodiments) As shown in FIG. 4, for example, by communicating each small chamber 73 with an equalizing pipe 77,
It is possible to make the pressure in each small chamber 73 the same. With this configuration, even if all the through holes 51 are formed to have the same size when the lengths of the three branch pipes 69 are different, each of the through holes 5
The flow rate of the mixed gas 65 blown from 1 becomes the same, and accordingly, the length of the flame formed on the surface of the surface combustion plate 75 becomes almost the same.

In the embodiment of FIG. 4, the pressure of the mixed gas 65 in each of the small chambers 73 is made the same by providing the equalizing pipe 77. In other embodiments, for example, FIG. As shown in FIG.
It is possible to make the pressure difference before and after the same. That is, the pressure measurement holes 79 are formed before and after the mixed gas supply plate 49 for each of the small chambers 73, and it is possible to provide a differential pressure measuring means for measuring a differential pressure before and after the pressure measurement holes 79. Each branch pipe 6
An adjusting valve 81 is provided at 9 so that the mixed gas pressure can be adjusted.

When it is detected that the pressure difference before and after the mixed gas supply plate 49 in one small chamber 73 is smaller than that in the other small chamber 73, the regulating valve of the branch pipe 69 connected to that small chamber 73 is detected. 81 is opened to increase the amount of the mixed gas 65 to be supplied. Then, the pressure in the small chamber 73 increases,
The pressure outside, that is, the front side of, the mixed gas supply plate 49 does not increase so much. As a result, the differential pressure across the mixed gas supply plate 49 increases. In this way, by manually setting the differential pressure of the mixed gas in each small chamber 73 to be substantially the same, the flow rate of the mixed gas 65 blown out from the through-hole 51, and thus the size of the flame formed on the surface of the surface combustion plate 75 Can be made uniform.

In the embodiment shown in FIG. 5, the adjusting valve 81 is manually adjusted. However, in other embodiments, the differential pressure across the mixed gas supply plate 49 is made uniform. It is also possible to provide control means for automatically adjusting the adjustment valve 81.

[0030]

As described above, according to the first, second or third aspect of the present invention, the mixed gas chamber is divided into a plurality of small chambers, and the mixed gas flows from each through hole through the branch pipe. Since it can be supplied so as to blow out at almost the same flow rate, even if the surface combustion plate is enlarged to increase the thermal power, the mixed gas passing through the fine combustion holes is almost the same at any part of the surface combustion plate Therefore, a flame of approximately the same length is stably formed on the surface.

According to the second aspect of the present invention, the pressure of the mixed gas in the small chambers communicated by the pressure equalizing tube is the same, and the total area of the through holes is also the same. Even if the plate becomes large, the flow rate of the mixed gas passing through the through hole becomes the same, and therefore, the size of the flame of the mixed gas passing through the surface combustion plate disposed in front thereof and burning on the surface thereof can easily be increased. Be uniformed.

According to the third aspect of the present invention, the mixed gas pressure is further adjusted by the adjusting valve such that the differential pressure before and after the mixed gas supply plate measured by the differential pressure measuring means is constant for each small chamber. Thereby, the amount of the mixed gas supplied from each through hole can be made uniform. Therefore, even if the surface combustion plate is enlarged to increase the thermal power, the size of the flame of the mixed gas passing through the surface combustion plate and burning on the surface can be easily made uniform.

[Brief description of the drawings]

FIG. 1 shows a surface combustion burner according to an embodiment of the present invention, wherein (A) is a horizontal cross-sectional plan view and (B) is a vertical cross-sectional side view.

FIG. 2 is a vertical sectional side view of a high-temperature regenerator to which the surface combustion burner of FIG. 1 is attached.

FIG. 3 is a horizontal sectional plan view of a high-temperature regenerator to which the surface combustion burner of FIG. 1 is attached.

4A and 4B show a surface combustion burner according to another embodiment, wherein FIG. 4A is a horizontal sectional plan view and FIG. 4B is a vertical sectional side view.

5A and 5B show a surface combustion burner according to another embodiment, wherein FIG. 5A is a horizontal sectional plan view and FIG. 5B is a vertical sectional side view.

FIG. 6 is a circuit diagram showing the piping of the entire absorption refrigerator including the high-temperature regenerator of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporation absorber body 2 Evaporator 3 Absorber 4 High temperature regenerator 5 Surface combustion burner 6 Rare absorption liquid piping P1 Absorption liquid pump 7 Low temperature heat exchanger 8 High temperature heat exchanger 10 High temperature body 11 Low temperature regenerator 12 Condenser 13 Refrigerant Vapor pipe 16 Refrigerant liquid down pipe 17 Refrigerant circulation pipe P2 Refrigerant pump 21 Cold water pipe 22 Intermediate absorbent liquid pipe 23 Intermediate absorbent liquid pipe 25 Rich absorbent liquid pipe 26 Rich absorbent liquid pipe 29 Cooling water pipe 30, 31 Spraying device 33 Fuel 35 Blower 41 Burner attachment port 43 Exhaust gas outlet 45 Inner shell 47 Outer shell 49 Mixed gas supply plate 51 Through hole 53 Space 55 Sprayer 57 Trunk pipe 59 Spray pipe 61 Liquid pipe 63 Liquid pipe group 65 Mixed gas 67 Spare gas chamber 69 Branch pipe 71 Mixing Gas chamber 72 Partition wall 73 Small chamber 75 Surface combustion plate 77 Equalizing tube 79 Pressure measurement hole 81 Adjusting valve

Continuation of the front page (72) Inventor Hakuichi Kubota 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term (reference) in Sanyo Electric Co., Ltd. 3K017 AA07 AB02 AC02 AD03 AD09 AD14 BA07 BB02 BC02 BC06 BE09 BE11 BE14

Claims (3)

[Claims] 1. A plurality of branch pipes for branching and guiding a mixed gas of fuel and air, a mixed gas chamber provided with small chambers arranged in parallel and connected to the respective branch pipes, and a front face of each small chamber. A mixed gas supply plate provided with a plurality of through holes through which the mixed gas passes, and a surface combustion plate provided in front of the mixed gas supply plate and formed with a large number of combustion holes through which the mixed gas passes, Surface burner characterized by having. 2. A surface combustion burner according to claim 1, wherein the through holes of the mixed gas supply plate have the same opening area, and a pressure equalizing pipe communicating with each of the small chambers is provided. 3. An adjusting valve for adjusting the mixed gas pressure in each branch pipe, and pressure measuring means for measuring the pressure between the mixed gas supply plate and the surface combustion plate and the pressure in each small chamber are provided. The surface combustion burner according to claim 1, wherein: