JPH0835609A - Burner equipment - Google Patents

Abstract

(57) [Summary] [Objective] To provide a burner device satisfying low NOx, low noise, light weight, and high safety. [Structure] A flame mouth body 12 composed of a main flame mouth opened in a functional material having a variable thermal conductivity in the thickness direction and an auxiliary flame mouth through which air-fuel mixture is exuded from the functional material, and a flame mouth body located upstream of the flame mouth body. A mixing chamber 11 for mixing fuel and air is provided. Further, a fuel regulator 8, a fuel nozzle facing the mixing chamber 11, a combustion fan 10, and a controller 13 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner device for burning fuel such as gas or petroleum to heat water or air, and more particularly to low NOx, low noise, light weight, compactness and high safety by premix combustion. The present invention relates to a burner device that satisfies the requirements.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional burner disclosed in Japanese Laid-Open Patent Publication No. 63-17309.
The fuel adjusted by the fuel valve 2 and ejected from the nozzle 3 and the air discharged from the fan 4 that sends combustion air are completely premixed in the mixing chamber 5, and then supplied to the porous body 6 and ignited downstream of the porous body 6. And burns to form a flame. The complete premixed flame has advantages such as compactness and low NOx, but on the other hand, since the combustion reaction is rapid, the porous body 6 may become red hot and flash back. Therefore, in this conventional example, a ceramic porous body is used, but since the thermal conductivity is lower than that of metal, thermal flame holding is not performed and the flame stable region is narrow, and a considerable thickness in the air-fuel mixture flow direction is provided to prevent flashback. Was needed.

[0003]

In such a conventional burner device, (1) since the flame stable region is narrow, the combustion is forced to occur in the vicinity of the theoretical mixing ratio, and the NOx value is relatively high at 40 to 80 ppm and is 60 ppm. In some cases, the regulations were exceeded. (2) Since the porous body 6 becomes thicker, the pressure loss of the device increases, which causes noise and hinders operation at night. (3) Due to the narrow flame stability region, abnormal combustion occurred in strong winds or after aging, and cracking of ceramics occurred. However, there was a problem such as the above, and it was just another step to disseminate it on a product basis.

The present invention solves the above-mentioned problems of the prior art and achieves low NO.
It is an object of the present invention to provide a burner device satisfying the following requirements: x, low noise, lightweight and compact, and high safety.

[0005]

In order to solve the above problems, the present invention provides a burner device in which a mixture is exuded from a main flame opening formed in a functional material having a variable thermal conductivity in the thickness direction and the functional material. A flame mouth body including an auxiliary flame mouth, a mixing chamber located upstream of the flame mouth body for mixing fuel and air, a fuel regulator for adjusting the fuel, and the mixing chamber connected to the fuel regulator. A fuel nozzle that faces the mixing chamber, a combustion fan that faces the mixing chamber and sends combustion air, and a fuel controller and a controller that controls the combustion fan.

Further, in order to widen the flame stable region, a plurality of the flame mouthpieces are provided and arranged so as to face each other.

In order to rectify the air-fuel mixture and increase the strength of the flame mouthpiece, a honeycomb lattice is provided on the upstream side of the flame mouthpiece so as to be in close contact with the flame mouthpiece.

Further, in order to shorten the flame, a slit is opened as a main flame opening in the longitudinal width in the combustion gas flow direction.

Further, in order to achieve low NOx, a slit is opened as a main flame opening in the longitudinal width in the direction perpendicular to the combustion gas flow.

Further, in order to predict failure and ensure safety, information on the ratio of the status sensor connected to the fuel regulator and the combustion fan capable of detecting the flow rate respectively to the initial value from the status sensor is received and the past history is received. And a controller for performing processing such as successive suppression of the combustion amount, alarm, stop, etc. when an abnormality is detected.

[0011]

The burner device of the present invention operates as follows with the above-mentioned configuration. A functional material controlled by a controller, adjusted by a fuel controller, completely premixed with the fuel ejected from a fuel nozzle and the air discharged from a combustion fan that sends combustion air in a mixing chamber, and then varied the thermal conductivity in the thickness direction. The mixture is supplied to the flame mouth made up of the main flame mouth opened to and the sub-flame mouth where the air-fuel mixture is exuded from the functional material, ignited in the downstream side of the flame mouth, and subjected to complete premixed combustion to form premixed flames. The flame formed in the main flame mouth is the main flame that occupies most of the relatively high speed, and the flame formed in the auxiliary flame mouth is the relatively low speed flame holding exuded from the functional material.

Since the functional material has a uniform and large thermal conductivity in the surface direction, the auxiliary flame port becomes uniform and has a relatively high temperature, and stable flame holding is formed to increase flame stability. Therefore, combustion can be performed on the lean side of the theoretical mixing ratio. On the other hand, since the main flame opening is open to the functional material, the pressure loss of the flame opening is reduced. When the thermal conductivity of the functional material is made smaller by varying it in the thickness direction, it is not necessary to increase the thickness of the flame mouthpiece, and it is possible to further reduce the pressure loss.

Further, by providing a plurality of flame nozzles and arranging them so as to face each other, a stagnation area is created in the flame collision area and the temperature of the flame orifices is increased, so that the flame stable area becomes wider and wider. , NOx reduction and safety can be secured.

Further, by providing a honeycomb lattice located on the upstream side of the flame mouthpiece so as to be in close contact with the flame mouthpiece, the air-fuel mixture can be rectified and the strength of the flame mouthpiece having a reduced thickness can be increased. .

Further, since the slit is opened as the main flame port in the longitudinal direction in the flow direction of the combustion gas, the combustion gas passes through both sides of the main flame formed on the downstream side of the slit.
It is possible to shorten the flame without contaminating the main flame.

Further, since the slit is opened as the main flame opening in the longitudinal width in the direction perpendicular to the flow of the combustion gas, the combustion gas causes the main flames formed on the downstream side of the slit to contaminate each other. Can be converted to NOx.

Further, the controller detects the voltage, current and rotational speed of the fuel regulator and the combustion fan by the status sensors connected to the fuel regulator and the combustion fan, respectively, which are capable of detecting the flow rate, and the initial flow rate at the same flow rate is detected. Calculate the ratio with the value, send it to the memory and store the past history, and if the time integral value or differential value of the ratio with the initial value exceeds the limit value, it will be judged as anomalous and the suppression of successive combustion amount, alarm or By performing processing such as stopping, failure can be predicted and safety can be secured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the burner device of the present invention is shown in FIGS.
This will be described with reference to FIG. FIG. 1 is a configuration diagram of a burner device according to a first embodiment of the present invention. In the burner device 7, fuel adjusted by a fuel adjuster 8 and ejected from a fuel nozzle 9 and a combustion fan 10 that sends combustion air are discharged. After completely premixing the air in the mixing chamber 11, the air is rectified by the honeycomb lattice 14 and supplied to the flame nozzle 12 made of a functional material that is uniform in the surface direction and has a variable thermal conductivity in the thickness direction. Further, the controller 13 controls the fuel controller 8 and the combustion fan 10 to ignite downstream of the flame nozzle 12 to form a premixed flame and maintain stable combustion.

Here, the flame mouthpiece 12 made of the functional material 15 will be described with reference to FIG. 2- (a), which is a configuration diagram of the flame mouthpiece in the burner device.

The functional material 15 is, for example, Fe, Ni,
There is one in which a heat resistant fiber body made of Cr, Al and Y is pressure-bonded and laminated. Since the Al-mixed fibrous bodies are connected in the surface direction by pressure bonding, the thermal conductivity is high. In addition, as shown in FIG.
Since it is laminated in multiple layers, an air heat insulating layer is formed in the thickness direction, and the thermal conductivity is extremely low.

For example, there is one in which Al is sequentially diffused from the surface of Ni-Cr steel to give a concentration distribution of Al in the thickness direction and fine holes are formed.

For example, there is a combination of a porous metal material and a porous thin ceramic. In any case, the same effect can be obtained.

Here, the flame formed in the main flame port 16 having a slit shape occupies a relatively large portion of the main flame 18 at a relatively high speed.
Therefore, the flame formed in the secondary flame port 17 becomes the flame holding 19 at a relatively low speed that has exuded from the functional material 15.

Since the functional material 15 has a uniform and large thermal conductivity in the surface direction, the auxiliary flame opening 17 is uniform and has a relatively high temperature and forms a stable flame holding 19 to hold the main flame opening 16 and the whole. Increases flame stability. Therefore, theoretical mixing ratio m = 1
It can be burned at a leaner mixture ratio m = 1.4 to 1.8, the flame temperature is lowered, and low NOx of 10 to 30 ppm is achieved.
Becomes On the other hand, since the main flame port 10 is further opened to the functional material 15 having an opening ratio of 20% or more, the pressure loss of the flame nozzle is reduced. Since the functional material 15 has an extremely small thermal conductivity in the thickness direction, it is not necessary to increase the thickness of the flame mouthpiece, and further low pressure loss can be achieved. The combustion fan 4 becomes a low pressure loss type such as a cross flow fan, and the burner The device has low noise.
The thickness of the flame tip 12 is 1 / thicker than that of the conventional ceramics.
It can be 10. Since the main flame 16 is a premixed flame, it is a very short flame, and it goes without saying that the device is compact and lightweight.

Further, as shown in FIG. 3, which is a configuration diagram in which the flame mouthpiece 12 of the second embodiment is opposed, as shown in FIG. 3, the flame mouthpieces 12a and 12b, the honeycomb lattices 14a and 14b, and the fuel nozzle 9a.
By arranging 2 and 9b respectively and arranging them so as to face each other, a stagnation region is formed in the flame collision region and the temperature of the flame mouthpieces 12 is increased, so that the flame stable region is further widened and further low NOx is obtained. Can be converted. Since the thermal conductivity in the thickness direction is low even if the temperature of the flame mouthpiece 12 rises, it is possible to ensure safety without flashback.

In this embodiment, the partition 2 is provided in the mixing chamber 11.
1, the burner can be switched by opening and closing the switching valve 20, and a large TDR of the burner device can be obtained.

Further, by providing the honeycomb lattice 14 located on the upstream side of the flame nozzle 12 so as to be in close contact with the flame nozzle 12, the air-fuel mixture is rectified and the strength of the flame nozzle with the reduced thickness is increased. be able to.

Further, by forming a slit as the main flame port 16 in the longitudinal direction in the combustion gas flow direction, the combustion gas is formed on both sides of the main flame formed on the downstream side of the slit as shown in FIG. 2 (b). Since the main flame 18 passes through, the flame can be shortened without contaminating the main flame 18, and the apparatus becomes compact.

Further, by forming a slit as the main flame port 16 in the longitudinal width in the direction perpendicular to the flow of combustion gas, the combustion gas is formed in the main flame downstream of the slit as shown in FIG. 2- (c). 18 will be polluted with each other by the combustion gas, and NOx can be further reduced.

Further, as shown in FIG. 4, the controller 13
The storage device 23 stores the information of the ratio with the initial value at the same fuel amount or the same air amount by the situation sensor 22 connected to the fuel regulator 8 and the combustion fan 10 which can detect the flow rate.
Send to and memorize the past history. The fuel amount is calculated from the inlet / outlet hot water temperature and the water amount, and the air amount is calculated from, for example, a flow rate sensor. The status sensor 22 is the voltage, current, rotational speed, etc. of the fuel controller 14 and the combustion fan 16 that can secondarily predict the flow rate. Next, the time integral value or differential value of the ratio with the initial value stored in the memory 3 is calculated, and when the value exceeds the limit value, it is judged as abnormal, and processing such as suppression of successive combustion amount, alarm or stop is performed. By doing so, the failure can be predicted and repaired before the failure.

[0031]

As is apparent from the above description, the burner device of the present invention has the following effects.

(1) Since the flame mouthpiece is formed of a functional material having a large thermal conductivity in the surface direction, the flame holding by the air-fuel mixture exuded from different functional materials is heated and stable. Is wide and can be burned on the lean side, resulting in low NOx, which is significantly below the standard.

(2) The flame mouthpiece is made of a functional material whose thermal conductivity is extremely small in the thickness direction and flame does not backfire.
Moreover, since the main flame opening is opened, it is not necessary to increase the thickness of the flame opening body, and low pressure loss can be achieved, and the burner device has low noise.

(3) Since both the main flame and flame holding are completely premixed flames, compact combustion is possible, and the burner device is lightweight because the flame mouthpiece is thin and simple.

(4) By providing a plurality of flame mouthpieces and arranging them so as to face each other, a retention area is formed in the flame collision area and the temperature of the flame mouth portions is increased, so that the flame stable area becomes wider and wider. Therefore, it is possible to further reduce NOx and TDR and ensure safety.

(5) By providing a honeycomb lattice located on the upstream side of the flame mouthpiece so as to be in close contact with the flame mouthpiece, the air-fuel mixture can be rectified and the strength of the flame mouthpiece having a reduced thickness can be increased. it can.

(6) Since the slit is opened as the main flame opening in the longitudinal direction in the flow direction of the combustion gas, it passes through both sides of the main flame, so that the flame can be shortened.

(7) By forming the slit as the main flame opening in the longitudinal width in the direction perpendicular to the combustion gas flow, the main flames are contaminated with each other, and the NOx can be further reduced.

(8) The controller sends the information from the situation sensor to the memory to store the past history, and when the time integral value or the derivative value of the ratio with the initial value exceeds the limit value, it is judged as abnormal, By performing processing such as suppression of the amount of successive combustion, alarm or stop, it is possible to predict failure and repair before failure.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a burner device according to a first embodiment of the present invention.

FIG. 2A is a configuration diagram of a flame nozzle in the burner device, FIG. 2B is a configuration diagram of a main flame port of a combustion gas flow direction slit in the burner device, and FIG. 2C is a combustion gas flow orthogonal slit in the burner device. Main flame outlet configuration diagram

FIG. 3 is a configuration diagram of a burner device according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a controller in the burner device.

FIG. 5 is a block diagram of a conventional burner.

[Explanation of symbols]

 7 Burner Device 8 Fuel Regulator 10 Combustion Fan 11 Mixing Chamber 12 Flame Mouth 14 Honeycomb Lattice 15 Functional Material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F23N 5/26 101 A

Claims (6)

[Claims] 1. A flame nozzle body comprising a main flame nozzle opening in a functional material whose thermal conductivity is variable in the thickness direction and an auxiliary flame nozzle through which air-fuel mixture leaks from the functional material, and an upstream side of the flame nozzle. A mixing chamber for mixing fuel and air, a fuel controller for controlling the fuel, a fuel nozzle connected to the fuel controller and facing the mixing chamber, and a combustion fan for sending combustion air to the mixing chamber. A burner device comprising the fuel regulator and a controller for controlling the combustion fan. 2. The burner device according to claim 1, wherein a plurality of flame nozzles are provided and arranged so as to face each other. 3. The burner device according to claim 1, wherein a honeycomb lattice is provided on the upstream side of the flame mouthpiece so as to be in close contact with the flame mouthpiece. 4. The burner device according to claim 1, 2 or 3, wherein a slit is formed as a main flame port so as to have a longitudinal width in the combustion gas flow direction. 5. The burner apparatus according to claim 2, wherein a slit is formed as the main flame opening in a longitudinal width in a direction perpendicular to the combustion gas flow. 6. The controller comprises a status sensor connected to the fuel regulator and the combustion fan, respectively, capable of detecting a flow rate, and a storage unit for receiving ratio information of an initial value from the status sensor and storing a past history. 6. When the time integral value or differential value of the ratio to the initial value exceeds the limit value, it is determined to be abnormal, and processing such as successive combustion amount suppression, alarm or stop is performed. Burner device described.