JPS5921918A - Combustion controlling mechanism employing multiburner - Google Patents

Abstract

PURPOSE:To enable easy control of temperature distribution at the interior of a furnace, by a method wherein a plurality of burner guns are installed to change fuel distribution of each of the burner guns. CONSTITUTION:A fuel distribution computer 37 is energized by means of a fuel flow rate signal branched from a fuel control part 28 to set their respective openings of fuel distributing valves 38 so as to match a fuel flow rate according to the predetermined fuel distribution. The fuel distributing valves 38 are disposed corresponding to their respective burner branch pipes 24 of a multiburner 23. A fuel branching part 39 feeds out the fuel, fed from a fuel flow rate regulating part 31, to their respective fuel distributing valves 38. Namely, various quantities of the fuel proportioning their respective openings of the fuel distributing valve 38 are fed out to their respective branch pipes 24. This permits easy control of temperature distribution within the furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the provision of a new and useful combustion control mechanism using a multi-burner.

With the recent rise in fuel prices, there has been remarkable progress in energy-saving technology for various industrial heating furnaces, boilers, melting furnaces, etc. that use Jori fuel.

This is particularly noticeable in combustion control, and the development of more advanced and efficient control technology is constantly desired.
It is.

Incidentally, in various types of combustion equipment, there are objects to be heated, and efficiency and quality control thereof are particularly important issues.

Under these circumstances, as typical combustion control techniques, severe control technologies such as exhaust gas O2 control and fuel injection (turn) have been developed and are being put into practical use. This is a technique that treats information as uniform.

Inside a combustion furnace, there is a temperature distribution including the flame, combustion gas, furnace wall, etc. Therefore, if there is a part of the object to be heated that is difficult to heat up, you will have to wait for that part to rise in temperature, and the part that has already been heated will be overheated, resulting in wasted fuel and time. Ta.

Uneven heating also has a negative impact on quality, such as cracking of the material due to thermal stress, reduced rolling accuracy due to temperature unevenness, and unevenness in the material.

Here, one conventional combustion control mechanism will be outlined with reference to FIG.

In FIG. 1, (1) is a combustion furnace, and the temperature inside this furnace is detected through a temperature detection terminal (8), and control calculations are performed in a temperature control section (2).

The 111 force signal of the temperature control (2) is connected as a setpoint to the fuel control (3).

The fuel flow rate controlled by the fuel control section (3) is transferred to the fuel supply section (
A) is detected at the detection end (9) and connected as a setting value of the combustion air control section (5) through the ratio setting device (4), and the flow rate of the air supply section (B) is detected at the detection end (Id). , the amount of air is controlled, the fuel goes through the flow rate adjustment part (6), the air goes through the flow rate adjustment part (7), and is sent out to the Panaro attached to the combustion furnace (1). 1) yoυ
It is considered combustible.

As is clear from FIG. 1 and the configuration described above, the conventional combustion control mechanism cannot control the temperature distribution within the furnace.

As a means of controlling the temperature distribution in the furnace, there may be a method of simply increasing the number of burners and controlling each one, or a method of varying the injection angle and flow rate of fuel and combustion air.

However, in the former case, the burner usually consists of one burner tile and one air register for one burner gun, and one burner requires a space several to several tens of times the diameter of the burner gun. However, it is not very practical due to technical restrictions and the need for major remodeling of the furnace.

In the latter case, although it is possible in concept, the construction of the burner T7 becomes too complicated and there is a problem in practical use.

In addition, since the burner section is exposed to high temperatures, the more complex the ffG structure is, the more likely it is that failures will occur, so this remains just a concept and is not practical.

Therefore, wood inventors and others have developed a system that allows control of the temperature distribution within the furnace, which is related to wood-related problems in various combustion furnaces.
They succeeded in developing a control mechanism that is simple in construction, easy to maintain, inexpensive, and durable.

In other words, the invention of the tree is based on the idea of combustion using a multi-burner, which breaks away from the conventional single burner gun and uses a plurality of burners, making it possible to easily control the temperature distribution inside the furnace by changing the individual fuel distribution. The purpose is to provide a control mechanism.

Furthermore, by attaching a burner tip with a specific injection angle to the tip of the burner branch pipe of the multi-burner, it is possible to distribute heat to areas that are difficult to heat up, and to reduce turndown (
The purpose of the present invention is to provide a combustion control mechanism using a multi-burner that is capable of ensuring a constant flow velocity by flowing fuel only to a specific burner branch pipe when the fuel flow rate decreases, and that can control optimal temperature distribution.

Incidentally, multi-type burners have been used in the form shown in FIG. 2 so far.

That is, in FIG. 2, 02 is a multi-burner, which is made up of a plurality of burner branch pipes 04) each having a burner tip 03 at its tip.

This burner allows for multi-purpose use. The original purpose of this method is to separate and inject fuel into the combustion air stream to promote mixing and improve combustibility.

Therefore, as is clear from the figure, it is necessary to make it multi-purpose.
It is not possible to control fuel distribution to each burner branch 04). For example, by changing the fuel injection hole diameter of the burner tip 031 of each burner branch pipe 04), it is possible to make a difference in temperature distribution compared to when the hole diameter is the same, but this is clearly not a control factor.

Furthermore, if a control device for controlling the hole diameter is incorporated into each of the burner branch pipes, the structure becomes too complicated, which causes problems in practical use.

Therefore, in the present invention, there is a large window lock in which the burners are multiplied and each burner branch pipe is controlled independently.

By using such a multi-burner, fuel distribution can be controlled outside the burner, and the burner and its control mechanism can be simplified.

The practical advantages of using a multi-burner are as follows.

In the integrated type chestnut mulch shown in Figure 2,
They can be several meters long and weigh hundreds of kilos.
, maintenance of the burner becomes extremely difficult.

In this respect, the multi-burners used in woodwork can be handled individually, making them lightweight and easy to maintain.

In addition, during maintenance, it is only necessary to extinguish and remove the burner branch pipe to be inspected, and other burner branch pipes are burned out.
It may also be possible to inspect up to

There is no need to modify the existing burners, and the functions can be left as they are. It is very effective when In addition, when new fuel is added, burner branch pipes can be added and burned independently.

The combustion control machine Fiet using the multi-burner of the present invention is
In particular, this effect can be demonstrated with gas-based fuels.

When fuel burns, a flame is created, and heat is transferred from the flame and combustion gas to the surrounding area. In this case, it is well known that there are two main types: radiation and convection.

Among industrial furnaces, most (90% or more) of high-temperature furnaces are caused by radiation.

Fire-phlegm radiation heat transfer can be divided into bright flame radiation and gas radiation.

Here, the bright flame radiation is radiation from solid substances (for example, unburned carbon, ash, etc.) floating in the flame, and the gas radiation is from diatomic gases such as Co, H, and O.

The amount of radiation is a function of emissivity and temperature; generally, when the emissivity is high, the gas temperature decreases, and when the emissivity is low, it is difficult to emit heat to the surroundings, so the gas temperature increases.

Also, there is a relationship between bright flame radiation and gas radiation.

In gas combustion, bright flame radiation is generally lower than in heavy oil combustion, and in those that do not include carbonization swimming, only gas radiation is produced, excluding soot and dust.

For this reason, in heavy oil combustion, the temperature inside the furnace tends to be uniform due to bright flame radiation, and in gas combustion, there is little heat dissipation, so localized high temperature areas are easily formed.

For example, we will consider an upper one-way firing soaking furnace that is widely used in steel mills.

The high-temperature combustion gas flow generated by gas combustion collides with the furnace wall on the side opposite the burner (the side opposite to the burner side) and locally heats that part. Under the influence of this, there was a problem in that the temperature of the object to be heated near the side opposite to the burner did not rise quickly, and the material on the burner side, which was difficult to heat up, continued to heat up slowly.

In addition to the problem of temperature distribution, there is also a problem at turndown.

When the gas flow rate decreases during the soaking period, the injection flow rate of fuel and air decreases, resulting in poor mixing and combustibility, and a decrease in momentum, which weakens the penetration force of the combustion gas. The temperature distribution inside the furnace is poor and the heating efficiency has decreased.

As described above, gas combustion tends to cause uneven temperature distribution due to the wood quality of the fuel and operational issues, and this is related to the energy saving and quality problems mentioned above.

Therefore, in gas combustion, it is especially important to control the flow of combustion gas and the temperature distribution within the furnace.

Taking the above points into account, in the present invention, first of all, as a combustion control mechanism using a multi-burner, a gas-fired multi-burner is installed in a combustion furnace, in which a plurality of burner branch pipes are each equipped with a burner tip. A temperature control unit is provided to be able to inject fuel into the furnace through the burner chip, and detects the temperature inside the combustion furnace, and a flow rate regulator is provided that is operated by an output signal of the temperature control unit. A fuel control section is provided, a fuel supply flow rate detection section for detecting the flow rate of the fuel supply section is provided, and the flow rate US moderator receives an output signal from the temperature control section and sets a flow rate in accordance with the output signal. A fuel flow rate adjustment section is also provided, which is configured to be able to compare the flow rate set value and a measurement signal from the fuel supply flow rate detection section, and is operated according to the nuclear-computed deviation, A fuel distribution valve for distributing fuel to each of the above is provided, and a fuel distribution calculator is provided which operates based on a fuel flow signal branched from the fuel control section, and the fuel distribution calculator operates in accordance with a predetermined fuel flow rate. A fuel branching section is provided, which is interlocked so that the opening degree of each of the fuel distribution valves can be set according to the determined fuel distribution, and branching and sending out the fuel controlled by the fuel flow rate adjusting section to each of the fuel distribution valves; The present invention is characterized in that fuel proportional to the opening degree of each fuel distribution valve can be delivered to each burner branch pipe.

Furthermore, a second feature of the present invention, in addition to the first feature, is that at least one of the burner chips provided at the tip of the burner branch pipe has its nozzle hole axis eccentric with respect to the branch pipe axis. It is characterized by

Hereinafter, embodiments of the present invention will be described in detail with reference to FIG. 8 and subsequent figures.

Figure 8 schematically shows the entire system of the embodiment of the present invention. In Figure 8, (20) is a combustion furnace, for example a gas-fired soaking furnace, and the furnace wall has a combustion air intake f21) is provided.

■ is a gas-fired multi-burner with multiple nookana branch pipes Qa.
The multi-burner is provided with a burner chip (8) at the tip of each of the burner tips (8), and the multi-burner is installed in the burner mounting portion C721 and injects fuel, that is, gas, into the combustion furnace through each of the burner tips (8). It is possible.

QGl is a temperature control unit that detects the temperature inside the furnace, and the detection end (4
) detects the temperature inside the furnace, a temperature control section (26) performs control calculations, and the output signal is connected as a set value to the fuel control section (26).

The fuel control section (28) has a built-in fuel flow control section, which receives an output signal from the temperature control section (5) and sets a flow rate setting value corresponding to the signal. and compares the measurement signal of the fuel supply flow rate detection unit (■) installed in the fuel supply unit (A) with the female claw ° set value, and outputs a control signal according to the deviation to the fuel flow condition adjustment unit (3I). In this way, the fuel flow rate is controlled by the fuel control section.

θ2 is a combustion air supply section, which is equipped with an air flow rate detection section (attached to an air control section having 331), and a flow control section 0Fi1.
The combustion air intake port 121) is connected to the combustion air intake port 121) through the combustion air intake port 121).

Note that (a6) indicates a ratio setting device.

The penalty is a fuel distribution computing unit, which is operated by the fuel flow 11 signal branched from the combustion control unit 2, and the fuel distribution computing unit M:
The opening degrees of the fuel distribution valves 8) can be set in conjunction with each other in accordance with a predetermined fuel distribution corresponding to the fuel flow rate.

The fuel distribution valves (color) are provided corresponding to the respective burner branch pipes c24) of the multi-burner, and in this illustrated example, since there are four independent burner branch pipes (241), the fuel distribution valves (38 ) are also provided independently on four sides.

(39) is a fuel branch part, the fuel flow rate adjustment part l31)
The fuel can be delivered to each of the fuel distribution valves (38).

That is, fuel proportional to the opening degree of each of the fuel distribution valves (38) is delivered to each burner branch pipe (241), and each burner tip can be injected into the furnace through the (see FIG. 3). In the Kihatsu U9J example described above, any number of burner branches may be used as long as they are multiple, and the larger the number, the more severe the temperature distribution can be controlled, but the structure after the fuel branch (39) becomes more complicated. Usually, 2 to xzfr2 is good, and 4 to 8 trees are most advantageous for conventional use.

The structure of the burner chip is not particularly limited in terms of characteristics v and 1 of the present invention, and is determined depending on the furnace characteristics and overall balance. The direction of fuel injection can be straight or in a specific direction, and can be generally symmetrical or asymmetrical.

Typical examples will be explained with reference to FIGS. 4 (1) to (5): 1. Figure 4 (1) shows an all-chip-trade type with a relatively long flame. In FIG. 4(2), the burner tips (25) of the upper pair of burner branches are straight. but,
- The pair of burner tips r25) in the Q part have their nozzle holes eccentrically centered with respect to the branch pipe axis (hereinafter referred to as eccentric type), and especially the lower part of the burner tip r25) has a large amount of heat. It is effective when you want to. In addition, if the embodiment shown in FIG. 4(2) is turned upside down, the heat can be distributed to the upper side.

In Fig. 4 (3), all burner tips (3) are of the so-called outward eccentric type, which is advantageous when it is desired to spread the flame in four directions to create a short flame.

FIG. 4 (4) is an example of a so-called inwardly eccentric burner tip, which is advantageous when it is desired to light a small short flame.

Figure 4 (5) is the pattern of Figure 4 (2) rotated 90 degrees in the counterclockwise direction, which is advantageous when you want to distribute heat to the right side facing the burner. If you turn it around, you can make it turn the heat to the left side.

As is clear from each side of FIG. 4, various temperature distributions can be created by combining the number of burner branches used, the injection direction, and the opening degree of the distribution valve.

If there are many burner branch pipes, the distribution valve may be shared by several burner branch pipes.

Also, the control of the fuel distribution valve may be made proportional to the fuel flow rate, and if the load reaches 76% at turndown, one of the valves is closed, and when the 50th section is closed, two valves are closed. There is no reduction in the fuel flow rate, and a certain level of combustibility is ensured (this is an example when there are four burner branch pipes).

In a furnace where the fuel flow rate does not fluctuate significantly, the distribution ratio may be determined in advance and the distribution valve opening may be determined and then manually set. In this case, the distribution ratio can be determined by omitting the distribution valve and changing the burner tip hole diameter. However, in this case, the flow rate is distributed so that the fuel flow rate is constant. cannot be expected.

The distribution valve color 8) can have any valve structure and type, and even one with a simple damper structure can be used.

-! In addition, by providing a flow rate needle on the upstream side of each distribution valve (38), it can also serve as a control valve for fuel flow rate.
At this time, the fuel supply flow rate detection section (30) shown in FIG.
The adjustment section (31) can be omitted, and in this case, the flow meter corresponds to the adjustment section (31).

In Example Niji, as a more severe method, the detection end (4)
The fuel flow rate of each burner branch pipe (24) can be controlled completely independently using the output signal by adding υ to each representative position of the furnace (for example, upper and lower parts of the furnace, burner side, anti-burner side, etc.). You can also.

In addition, by separately providing a fuel supply line, that is, a fuel supply section and a fuel branch section (39), it is possible to flow different types of fuel to each burner branch pipe side, and the fuel supply line of the embodiment can be installed around the existing burners. By installing a burner, co-firing with existing burners can be easily carried out.

The results of various tests conducted in a combustion test furnace using the control mechanism of the above embodiment will be described.・The test furnace is a rectangular fireproof type (ironized) with a height of 700 mm, a width of 50 ONM, and a length of 97 (lrx).

The fuel is converter gas (00i 65% IH,; 1.5%, N
.

; 17%, 0% and 12%, moisture content: 4.5%), and the net exothermic value is 1o90/Nnr'.

The combustion conditions are as follows.

Combustion amount: 100 x 10" Kcal/h (flow rate: 50"/h) Exhaust gas: 0.1% Combustion air temperature: 400°C Burner: 4 branch pipes The measurement results of the temperature distribution inside the furnace are shown in Figure 5. The figure shows a vertical cross section at the center of the furnace.

Figure 5 (1) is a conventional example in which the same flow rate was passed through each branch pipe and a straight type burner tip was used, and Figure 5 (2) shows the results of the two upper pipes under the same conditions. 5N'/h for each branch pipe, 2ONM for each of the two lower trees.
This is an example of the present invention in which fuel of '//h was flowed.

In the conventional type shown in Fig. 5 (1), a high temperature area is formed on the central axis of the burner tile, but in the example of the present invention shown in Fig. 5 (2), the high temperature area moves to the lower part of the furnace, and the area is also long. This causes a difference in temperature distribution.

Figure 5 (3) shows the fuel distribution shown in Figure 5 (2), in which the burner tip on the above side is straight, and the lower part (11112) has an injection angle of 10 degrees and injects downward. It can be seen that the high temperature region has moved further to the lower side. Therefore, when the object to be heated is at the lower side of the furnace, the condition shown in FIG. 5 (3) has the highest heating efficiency.

Next, we will discuss the results of actually measuring the temperature of an object to be heated (steel material) placed in the furnace.

The steel material (0) had a square shape of 120 mm x 820 mm, had a unit weight of approximately 86 kg, and 8 pieces were charged into the furnace.

FIG. 6 shows the charging position of the steel material (0) and the temperature measurement point (D), and FIG. 7 shows a conventional example of the steel material temperature rise curve.

In other words, when using a burner with 4 wooden burner branches and a straight burner tip to allow the fuel to flow evenly, the 7th
It is shown in the figure.

In Fig. 7, code (1) is the furnace temperature on the anti-burner side, and (2)
indicates the burner side furnace temperature, (3) to (6) indicate the steel material temperature, (7) indicates the fuel load, and (8) indicates the exhaust gas temperature, respectively.

Regarding the temperature of the steel material (0), a total of four points are representatively shown: the burner side where the temperature difference is the greatest, and the upper and lower parts of the steel material on the anti-burner side.

In FIG. 7, (3) is the center of the upper part of the steel material on the side opposite to the burner, (4) is the center of the lower part, (5) is the center of the upper part of the steel material on the burner side, and (6) is the center of the lower part.

Note that the combustion air temperature was kept constant at 400° C., and the excess air ratio was adjusted to be 1% with exhaust gas O1.

As is clear from Fig. 7, the temperature of the steel material on the opposite side of the burner rises well.
The upper part is the best. This is clear from the temperature distribution in the furnace shown in Figure 5, which is explained above, when converter gas is a fuel with almost no bright flame radiation, there is little heat dissipation from the flame, and the high-temperature gas flow formed during combustion is As it is, it reaches the side opposite to the part and heats the furnace wall in that area.As a result, the radiant heat of the furnace wall on the side opposite to the burner is large, and the temperature of the steel material on the side opposite to the burner increases.

In comparison, the temperature at the bottom of the steel material on the burner side was the worst, and did not reach the target temperature of 1200°C even at the end of soaking. Control of this minimum temperature is important in industrial furnaces. 7th
As shown in the figure, it is clear that in the conventional example where furnace temperature distribution cannot be controlled, a longer combustion period and more fuel are required.

In this case, it is clear that fuel and time can be saved by controlling the temperature distribution in the furnace so that the temperature is higher on the burner side than on the furnace side.

In another experiment, we changed the shape of the burner and measured temperatures under conditions where the furnace temperature was uniform on the burner side and on the opposite side.

According to the results, it was found that in the case of FIG. 7, the temperature of the lower part of the steel material on the Pana side also increased, but the exhaust gas loss increased. This is because there is a combustion gas outlet on the burner side, so increasing the furnace temperature on the burner side directly leads to a rise in exhaust gas temperature, which increases loss.

Therefore, based on these results, the following furnace temperature pattern is adopted in the present invention.

During the heating period (combustion amount load 100%), gas combustion and furnace characteristics are effectively used to mainly heat the steel material on the side opposite to the burner, and during the soaking period (during fuel turndown), the steel material on the burner side is mainly heated. do.

In other words, from Figure 7, during the heating period, the steel material on the side opposite the burner has good heatability and the exhaust gas temperature is low, so in order to make good use of this effect, a straight burner chip is installed in the burner branch pipe 2 on the upper side of the burner. A large amount of fuel flows through the lower burner branch pipe, giving more heat to the side opposite the burner.

During the heating period, the heating of the steel material on the opposite burner side is improved and the exhaust gas temperature is lowered, compared to the conventional example.

Furthermore, a burner tip with a 10-degree injection angle is installed downward on the burner branch pipe on the lower side, and during the soaking period, more fuel flows toward the lower side, increasing the heat of the steel material on the burner side and the lower side of the steel material. .

These effects make it possible to equalize the temperature of the steel material, shorten the heating time, and reduce the amount of fuel used.

Of course, various patterns can be considered for the ratio of fuel flowing into the burner branch pipe on the upper side of the burner and the burner branch pipe on the lower side, but it is possible to have more flow in the upper side during the heating period and more in the lower side during the soaking period. The above effects were observed in both cases.

An example of a typical pattern among them is shown in FIG.

In Figure 8, (1) is the total fuel load, (2+
+31 is the load on the upper and lower burner branches according to the conventional example, (4)
is the load on the burner branch pipes of the upper two trees, and (5) is the load on the burner branch pipes of the lower two Pi trees.

As is clear from Fig. 8, in conventional example (2) +31,
Naturally, only the same load can be applied to the upper and lower parts, but the present invention (4) (5)
) allows you to create any pattern.

A typical example is a total of 75 sections in the upper burner branch during the heating period.
25% of the fuel flows into the lower burner branch pipe, and when the total burner load reaches 85% during the soaking period, it flows uniformly to each upper and lower burner branch pipe. Use a higher proportion.

Fig. 8 shows the steel material temperature measurement results during the e-material distribution, ie, furnace temperature distribution control, is shown in Fig. 9.

Comparing Fig. 6 of the conventional example and Fig. 9 of the tree invention,
During the heating period, the temperature rising property of the steel material on the opposite burner side is good υ, and the exhaust gas temperature is 80 to 40 degrees Celsius lower.

During the soaking period, the furnace temperature on the burner side rises well, and the temperature rises on the burner side steel material and the lower part of the steel material.

Finally, the temperature at the bottom of the steel material on the burner side is 1200°C or higher, improving the uniformity of heat. In addition, the temperature rise time (furnace time) was also shortened, and the total exhaust gas loss was reduced.

As a result, according to the invention, fuel consumption can be reduced by approximately 16% compared to the conventional method under the same furnace operating time.

Although the fuel distribution pattern was determined in advance in this example, some of the following tests were also conducted in the heating period of the example, in which 60 liters of fuel was evenly distributed to each of the burner branches on the upper and lower sides. During the soaking period, only the upper burner branch pipe was turned down. That is, the total fuel load is 5
At 0%, the upper side becomes 0, and only the lower side is burned.

Even under these conditions, a fuel saving of about 8% was confirmed, but in the embodiment shown in FIG. 8, the furnace time was slightly longer.

Furthermore, as detailed temperature distribution control, the flow rates of the upper and lower burner branch pipes can be independently controlled based on the furnace temperature signals on the burner side and the anti-burner side.

As is clear from the detailed description above, according to the wooden invention,
The structure and mechanism (@) are simple and can be used for practical purposes.

Furthermore, since it is only necessary to consider a temperature pattern that matches the characteristics of the furnace, it is possible to apply it to any furnace.

There is no need to modify the furnace, burner tile, air register, etc., and the power of the burner gun body and fuel lasn is modified, so there is no need to significantly shut down the furnace, and it can be easily applied to existing furnaces.

Therefore, it can be said that the invention of wood has great practical value as it has effectively achieved its intended purpose.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional combustion control system, Fig. 2 is a perspective view of a conventional multi-burner, Fig. 8 is a block diagram of a combustion control system showing an embodiment of the wooden invention, and Fig. 4 (1). (24(31(4)
1 (51 is a front view and burner sectional view of several examples of multi-burners used in the present invention, FIG. 5 (1) (21 (31 is an explanatory diagram of 8 examples showing the temperature distribution in the furnace, Fig. 7 is a graph showing the temperature rise curve according to the conventional example, Fig. 8 is an explanatory drawing showing the fuel distribution pattern, and Fig. 9 is the temperature rise curve during control according to the present invention. This is a graph showing the combustion furnace, multi-burner, G41...
Burner branch pipe, burner chip, (Incorporated Foundation)...temperature control unit, (28+...fuel control unit, (311...fuel flow rate adjustment unit, 0η...fuel distribution calculator, (38 )・
...Fuel distribution valve, (39)...Fuel branch.

Claims (1)

[Scope of Claims] 1. A gas-fired multi-burner, each of which has a burner tip at the tip of a plurality of burner branch pipes, is installed in a combustion furnace so that fuel can be injected into the furnace through the birch tips, and the combustion A fuel control unit includes a temperature control unit that detects the temperature inside the furnace, a fuel control unit that includes a flow rate regulator operated by an output signal of the temperature control unit, and a fuel supply unit that detects the flow rate of the fuel supply unit. A flow rate detection section is provided, and the flow rate regulator receives an output signal from the temperature control section and sets a flow rate corresponding thereto, and also outputs the flow rate setting value and a measurement signal from the fuel supply flow rate detection section. A fuel flow control section configured to be comparable and operated in accordance with the compared deviation is provided, and further provided is a fuel distribution valve for distributing fuel to each of the burner branch pipes, the fuel flow control section branching from the fuel control section. a fuel distribution operator operated by a signal, the fuel distribution operator being able to set the opening degree of each of the fuel distribution valves according to a predetermined fuel distribution commensurate with the fuel flow rate; A fuel branching section is provided which branches and sends the fuel controlled by the fuel flow rate adjusting section to each of the fuel distribution valves, and the fuel branching section is configured to branch and send the fuel controlled by the fuel flow rate adjusting section to each of the fuel distribution valves. A combustion control mechanism using a multi-burner characterized by being configured so that it can be sent to a branch pipe. 2. A gas-fired multi-burner, each of which is provided with a na tip at the tip of a plurality of burner branch pipes, is installed in the combustion furnace so that fuel can be injected into the furnace through the burner tip,
A temperature control section that detects the internal temperature of the combustion furnace is provided, a fuel control section that is equipped with a flow rate regulator that is operated by an output signal of the temperature control section, and a fuel control section that detects the flow rate of the fuel supply section. A supply flow rate detection section is provided, and the flow rate regulator receives an output signal from the temperature control section, sets a flow rate corresponding to the output signal, and compares the flow rate setting value with a measurement signal from the fuel supply flow rate detection section. A fuel flow regulator configured to be operable in response to the compared deviation is provided, and further provided is a fuel distribution valve for distributing fuel to each of the burner branches, the fuel distribution valve being branched from the fuel control unit. A fuel distribution calculator that operates with a fuel flow ratio 1 signal is provided, and the fuel distribution calculator is interlocked so that the opening degree of each of the fuel distribution valves can be set according to a predetermined fuel distribution corresponding to the fuel flow rate. A fuel branching section is provided for branching and sending the fuel controlled by the fuel flow rate adjusting section to each of the fuel distribution valves, and fuel 1 proportional to the opening degree of each of the fuel distribution valves is supplied to each burner branch pipe. The multi-burner is configured such that at least one of the burner chips provided at the tip of the burner branch pipe has its nozzle hole axis eccentric with respect to the branch pipe axis. Combustion control mechanism.