JP2766452B2 - Combustion method of regenerative burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burning a burner installed in a furnace using a combustion reaction as a heat source or other heat equipment. More specifically, a first burner and a second burner are paired, and a pair or a plurality of pairs of burners are arranged in one combustion chamber, and each burner is a heat storage element through which combustion air and combustion exhaust gas pass. The first burner group and the second burner group are alternately burned, and when the burner is not burning, the heat of the combustion exhaust gas passing through the heat accumulator of the burner is transferred to the heat accumulator and stored. The present invention relates to a combustion method for a regenerative burner that repeats a cycle in which the combustion air passing therethrough is extracted and preheated (heated) by the heat stored in the regenerator during combustion.

[0002]

2. Description of the Related Art In recent years, as a device for increasing the thermal efficiency of an industrial furnace such as a metal heating furnace and a heat treatment furnace, Japanese Patent Application Laid-Open No. Sho 62-94703,
A pair of a first burner and a second burner, represented by Japanese Patent Application Laid-Open No. 2-10002, is provided as a pair, and a pair or a plurality of pairs of burners are arranged in one combustion chamber. It has a heat storage body through which the combustion exhaust gas passes, and the first burner group and the second burner group are alternately burned, and when the burner is not burning, the heat of the combustion exhaust gas passing through the heat storage body of the burner is used. There has been proposed a regenerative burner that repeats a cycle in which heat is transferred to and stored in a heat storage body, and combustion air passing through the heat stored in the heat storage body is extracted and preheated (heated) during combustion (hereinafter, referred to as “prior art”). Technology 1).

[0003]

A description will be given by taking JP-A-2-2-10002 as an example. FIG. 10 is a system diagram showing a regenerative burner disclosed in the publication, and FIG. 11 is an explanatory diagram showing its operation. The regenerative burner 110 is used for the combustion in the pipe between the regenerator 118 and the four-way switching valve (device for switching the flow path between combustion air and combustion exhaust gas, air valve 122, exhaust valve 124) every time the fluid is switched. Replaced by air and flue gas. Particularly, when the combustion air is started to flow (when complete combustion with an air ratio of 1 or more is performed), the combustion exhaust gas remaining in the heat storage body and the pipe from the heat storage body to the four-way switching valve first flows into the burner section. Therefore, when the four-way switching valve injects fuel into the burner at the same time as the completion of the flow path switching at the time of combustion switching, the heat storage body and
Fuel is injected into the flue gas (having almost no oxygen) remaining in the pipe from the heat storage unit to the four-way switching valve, and the fuel is incompletely burned while the remaining flue gas flows into the burner. Then, unburned gas is discharged. Therefore, fuel injection into the combustion side burner at the time of combustion switching, after the four-way switching valve completes the flow path switching, do not supply fuel for several seconds, flow only combustion air, between the regenerator and the four-way switching valve The combustion exhaust gas remaining in the pipe is discharged (referred to as "exhaust gas purge"), and then the fuel is injected (injected). FIG.
, 112 is a furnace, 114 is a burner, 116 is combustion air /
Exhaust passage, 120 is combustion blower, 121 is fan inlet, 126
Is a connection, and 127 is a control valve.

However, the method using the exhaust gas purge shown in the prior art 1 has the following disadvantages. That is, when the combustion switching cycle time of the regenerative burner is switched for 30 seconds and the exhaust gas barge time is 3 seconds, the fuel injection time is 27 seconds.
Seconds and the dead time during which both the first and second burners do not burn will account for 10% of the burning time. Therefore, to supply 100,000 kcal of fuel per hour, it is necessary to install a burner of 110,000 kcal / h. Depending on engineering restrictions, when performing combustion switching of multiple regenerative burners with a single switching valve, the piping from the regenerator to the four-way switching valve becomes longer, and the amount of residual combustion exhaust gas increases. A longer barge time is required, the dead time is longer, and the burner capacity is further increased as described above. This increases the size of each device such as fuel, air, flue gas piping, and burners, and increases equipment costs.

[0005] When the combustion switching cycle time is extended, the heat storage capacity of the heat storage body must be increased. Therefore, the size of the heat storage body becomes large, and the furnace becomes large and the equipment cost increases. In addition, if the fuel that extrudes the combustion exhaust gas is not injected as soon as it flows into the burner, air that does not contribute to the combustion of the purge air flows into the furnace, increasing the oxygen concentration in the furnace and increasing the exhaust loss. Occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an exhaust gas purging time at the time of combustion switching, that is, a switching combustion (alternating combustion) without a dead time. SUMMARY OF THE INVENTION An object of the present invention is to provide a regenerative burner combustion method capable of improving safety, increasing the size of equipment, and reducing exhaust loss.

[0007]

Means for Solving the Problems We have intensively studied to solve the above problems. As a result, when the combustion exhaust gas remaining in the pipe between the regenerator and the four-way switching valve flows into the burner at the start of each burner combustion of the switching combustion, the oxygen concentration in the remaining combustion exhaust gas, that is, It has been found that this is achieved by increasing the oxygen content and burning the fuel with oxygen in the residual combustion exhaust gas.

[0008] The present invention has been made based on the above findings, and the gist of the present invention is as follows.
According to the first invention of the present application, a first burner and a second burner are paired, and a pair or a plurality of pairs of burners are arranged in one combustion chamber (furnace), and each burner has combustion air and combustion exhaust gas. A heat storage that passes therethrough, wherein the first burner group and the second burner group are alternately burned, and when the burner is not burning, heat of combustion exhaust gas passing through the heat storage body of the burner is transferred to the heat storage body In the combustion method of the regenerative burner, which repeats a cycle in which the combustion air that passes through the heat stored in the heat storage body when the burner burns is extracted and preheated (heated) during combustion, the combustion side burner is used immediately after the combustion is switched. While the flue gas in the pipe from the regenerator to the four-way switching valve is pushed out to the regenerator by the burner by the combustion air, oxygen is injected into the flue gas flowing into the regenerator, and the fuel and the input acid are added. Those having features to combustion by reacting a combustion exhaust gas containing.

According to the second invention of the present application, the first burner and the second burner are paired, and a pair or a plurality of pairs of burners are grouped into one.
Are disposed in two combustion chambers (furnaces), each burner has a heat storage body through which combustion air and combustion exhaust gas pass, and the first burner group and the second burner group are alternately burned, and the burners are non-burning. During combustion, the heat of the combustion exhaust gas passing through the heat accumulator of the burner is transferred to and stored in the heat accumulator. When the burner is burning, the combustion air passing through the heat accumulated in the heat accumulator is discharged and preheated (heated). In the combustion method of the regenerative burner that repeats the cycle, the oxygen is injected into the combustion exhaust gas after passing through the regenerator on the non-combustion burner side immediately before the combustion switching and the heat is removed, and from the regenerator on the non-combustion side burner. The combustion exhaust gas containing the input oxygen is filled in the pipe up to the four-way switching valve, and immediately after the combustion switching, the combustion exhaust gas containing the input oxygen in the pipe from the heat storage element to the four-way switching valve in the combustion side burner is the heat storage element. To combustion air While extruded into the burner I, and it has the characteristics to combustion by reacting a flue gas containing the charged oxygen as fuel.

According to the third invention of the present application, the first burner and the second burner are paired, and a pair or a plurality of pairs of burners are grouped into one.
Are disposed in two combustion chambers (furnaces), each burner has a heat storage body through which combustion air and combustion exhaust gas pass, and the first burner group and the second burner group are alternately burned, and the burners are non-burning. During combustion, the heat of the combustion exhaust gas passing through the heat accumulator of the burner is transferred to and stored in the heat accumulator. When the burner is burning, the combustion air passing through the heat accumulated in the heat accumulator is discharged and preheated (heated). In the combustion method of the regenerative burner that repeats the cycle, immediately after the combustion switching, while the combustion exhaust gas in the pipe from the regenerator to the four-way switching valve in the combustion side burner is pushed out to the regenerator by the combustion air into the burner, It is characterized in that oxygen is injected into the preheated combustion exhaust gas that has passed through the heat storage body, and fuel is reacted with the combustion exhaust gas containing the input oxygen to perform combustion.

According to a fourth aspect of the present invention, the first burner and the second burner are paired, and a pair or a plurality of pairs of burners are grouped into one.
Are disposed in two combustion chambers (furnaces), each burner has a heat storage body through which combustion air and combustion exhaust gas pass, and the first burner group and the second burner group are alternately burned to make the burner non-burning. A cycle in which the heat of the combustion exhaust gas passing through the regenerator of the burner during combustion is transferred to and stored in the regenerator, and the combustion air passing through the heat stored in the regenerator is removed and preheated (heated) during combustion. In a regenerative burner that repeats
Immediately before switching to combustion, oxygen is injected into the combustion exhaust gas before passing through the heat storage material on the non-combustion burner side, and the exhaust gas containing the input oxygen is filled in the pipe from the heat storage material on the non-combustion burner to the four-way switching valve. Immediately after the combustion switching, while the combustion exhaust gas containing the input oxygen in the pipe from the heat storage body to the four-way switching valve is pushed out to the heat storage body by the combustion air at the combustion side burner, the fuel and the input oxygen are discharged. It is characterized by reacting with the contained combustion exhaust gas and burning.

[0012] In a fifth aspect of the present invention based on the first to fourth aspects of the present invention, the concentration of the oxygen in the mixed gas comprising the flue gas and the oxygen introduced into the flue gas is detected to control the oxygen amount. In particular, it has features.

[0013] A gas containing oxygen may be introduced into the combustion exhaust gas.

[0014]

According to the first aspect of the present invention, the fuel and the combustion exhaust gas containing oxygen can react and burn, and the switching combustion (alternating combustion) is performed without the exhaust gas purge time at the time of combustion switching, that is, without dead time. It becomes possible.

According to the second aspect of the present invention, it is possible to fill the pipe from the heat storage body of the non-combustion side burner to the four-way switching valve with the combustion exhaust gas containing the supplied oxygen. While the combustion exhaust gas containing oxygen in the pipe from the heat storage body to the four-way switching valve is pushed out to the burner by the air for combustion by the heat storage body, the fuel and the combustion exhaust gas containing oxygen can react and burn. It is possible to perform the switching combustion (alternating combustion) without the combustion exhaust gas purge time, that is, the dead time.

According to the third aspect of the present invention, the fuel and the exhaust gas containing oxygen can react with each other and burn, and the switching combustion (alternating combustion) can be performed without the dead time in the exhaust gas purging time at the time of switching the combustion. Becomes possible.

According to the fourth aspect of the present invention, it is possible to fill the piping from the heat storage body of the non-combustion side burner to the four-way switching valve with the combustion exhaust gas containing the injected oxygen. While the combustion exhaust gas containing oxygen in the piping from the heat storage body to the four-way switching valve is pushed out to the burner by the combustion air by the heat storage body, the fuel and the combustion exhaust gas containing the input oxygen can react and burn. Switching combustion (alternating combustion) can be performed without a combustion exhaust gas purge time at the time of switching, that is, without dead time.

In the first to fourth aspects of the present invention, by checking the concentration (amount) of oxygen (or other supporting gas) sent to the combustion side burner, fuel, air, oxygen (combustible gas) are checked. The malfunction of each supply control device can be prevented, and the safety can be improved.

In the first to fifth aspects of the present invention, the same operation as in the case of using oxygen can be obtained by using a gas containing oxygen instead of oxygen as the gas to be injected into the combustion exhaust gas.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on embodiments shown in the drawings. [Embodiment 1] FIGS. 1 and 2 are system diagrams showing the configuration of a regenerative burner for carrying out Embodiment 1 of the combustion method of the present invention. As shown in FIGS. 1 and 2, the regenerative burner includes a first burner and a second burner as a pair, and a pair or a plurality of pairs of burners in one combustion chamber (furnace).
1, each burner includes a main burner portion (a main burner fuel nozzle 4 and a main burner fuel header 3), a regenerator 2 through which combustion air and combustion exhaust gas of the main burner portion pass, and their fuel or air. Each of which is provided with a supply adjusting device. The main burner and the regenerator 2 are divided into a combustion air system 17 and a combustion exhaust gas exhaust system.
18 can be selectively connected via the four-way switching valve 6 to alternately burn the first burner group and the second burner group so that the burner passes through the heat storage body 2 of the burner when not burning. The heat of the combustion exhaust gas is transferred and stored in the regenerator 2, and during combustion, the cycle in which the combustion air passing through the heat stored in the regenerator 2 is extracted and preheated (heated) is repeatedly and alternately supplied. In the case of the present embodiment, the combustion air is a forced air blower
The combustion exhaust gas is supplied by a combustion exhaust gas suction blower 13 and is configured to be exhausted by the exhaust gas suction blower 13. Each burner has a pilot burner 5.

Each of the pilot burners 5, 5 is connected to systems 20, 21 for supplying fuel and air, and the combustion of the pilot burners 5, 5 is synchronized with the point fire extinguishing of each main burner. Alternatively, it may be constantly burned. Further, the temperature of the preheated air (preheated combustion exhaust gas) after the heat storage body 2 is measured (not shown), and it is monitored that the preheated air (preheated combustion exhaust gas) is preheated to a temperature sufficient to ignite the fuel spontaneously. If possible, the pilot burner 5 may extinguish the fire. However, it is possible that the preheated air (preheated combustion exhaust gas) may not be preheated to a temperature sufficient to ignite the fuel due to disturbance at the time of temperature change in the furnace. If not preheated, it is desirable to have a function to relight the pilot burner 5.

The combustion control of each of these burners 4, 5 is performed as follows. That is, combustion of each burner 4, 5;
Non-combustion, switching time measurement (count) and four-way switching valve 6
Is controlled by the main controller 23. The air ratio control of each burner 4, 5 is performed by individual combustion control devices 22, 22.

The combustion method of the present invention can be applied to any type of burner, and can be applied to any type of burner. Further, any type of burner can be attached to the furnace. It is also possible to apply those.

Next, the operation of this embodiment performed by the apparatus shown in FIGS. 1 and 2 will be described. 5 to 7 are explanatory diagrams showing the operation in the present embodiment. The first burner group is expressed as A burner, and the second burner group is expressed as B burner. The burners A and B are alternately switched and burned for each switching combustion. First, an appropriate amount of fuel and air are supplied to the pilot burner 5 on the A burner side, and ignited by the spark of the ignition ignition. The main burner combustion air supplied by the blower 12 passes through the four-way switching valve 6, the flow measurement orifice 8, and the combustion air flow regulating valve 7, and is preheated through the regenerator 2 to a high temperature (700 to 1000 ° C.). The preheated air is supplied to the main burner and reacts with the fuel injected from the main burner fuel nozzle 4 to burn.

A time schedule is stored in the main controller 23 in advance, and a command signal is transmitted to the main burner controller 22. The combustion exhaust gas is discharged into the furnace 1 and is discharged from the B burner through the B burner-side regenerator 2 by the combustion exhaust gas suction blower 13 via the four-way switching valve 6. The discharged sensible heat of the flue gas is recovered by the heat storage element 2 when passing through the B-burner side heat storage element 2.

After a certain period of time, the main controller 23
The combustion switching signal from the burner to the B burner is transmitted. That is, the flow switching instruction signal of the four-way switching valve 6, the closing (OFF) signal of each solenoid valve of the main fuel cutoff valve 14, the pilot air cutoff valve 15, and the pilot fuel cutoff valve 16 on the A burner side, and the B burner side Main fuel cutoff valve 14, pilot air cutoff valve 15,
An electronic control unit transmits an open (ON) signal of each solenoid valve of the pilot fuel cutoff valve 16 and the oxygen supply cutoff valve 25, a B burner side pilot ignition ignition ON signal, and the like. As a result, the combustion of the burner switches from the A burner side to the B burner side. At this time, the piping and the like between the heat storage body 2 on the B burner side and the four-way switching valve 6 are filled with the combustion exhaust gas. Therefore, oxygen supply is performed for a while from the start of the B burner combustion, that is, while the combustion exhaust gas filled in the pipes and the like between the heat storage body 2 and the four-way switching valve 6 is pushed out by the combustion air flowing from the four-way switching valve 6. The shut-off valve 25 is opened, oxygen is injected from the oxygen supply nozzle 24, and the oxygen partial pressure in the combustion exhaust gas that is about to flow into the B burner increases. Therefore, even if fuel is injected from the main burner fuel nozzle 4 of the B burner, combustion occurs. Since a combustion reaction occurs with oxygen in the exhaust gas, dead time due to exhaust gas purging does not occur.

The supply of oxygen from the oxygen supply nozzle 24 may be performed by a controller 22 or the like using a timer for injection for a certain period of time corresponding to the pipe capacity between the heat storage unit 2 and the four-way switching valve 6,
The oxygen concentration is measured by the oxygen concentration measuring device 11, and the air is stored in the heat storage unit 2.
Check that the oxygen concentration reaches 21%, that is, if the air is supplied, the oxygen concentration is 21%. In the case of the combustion exhaust gas circulation system that mixes the combustion exhaust gas into the air, the oxygen supply is performed until the specified oxygen concentration is reached. A method of opening the shutoff valve 25 may be used. In the case of the oxygen concentration measurement method, not only the oxygen concentration in the gas can be controlled and safety is improved, but also by monitoring the time during which the oxygen supply cutoff valve 25 is open, equipment diagnosis of the heat storage burner can be performed.

For example, when the time during which the oxygen supply cutoff valve 25 is open is long, the pipes are open due to cracks in the pipe, air is being injected, the heat storage body 2 is broken, and the pressure loss is increased. If the operating time becomes short, the oxygen supply shutoff valve 25
An abnormality such as leakage of oxygen can be estimated.

In FIG. 1, the oxygen supply nozzle 24 is provided on the four-way switching valve side of the heat storage unit 2, and the oxygen supply nozzle 24 is provided on the burner side of the heat storage unit 2 as shown in FIG. May be installed. In the case of FIG. 2, the oxygen supply nozzle 24 is
Since the burner is exposed to high-temperature furnace gas (combustion exhaust gas) during non-combustion, it is necessary to take heat-resistant measures (using heat-resistant metals, ceramics, etc.), but in the method of FIG. While oxygen cannot be supplied to the exhaust gas, the system of FIG. 2 can increase the oxygen partial pressure in all the combustion exhaust gas flowing into the burner.

The location of the oxygen concentration measuring device 11 in the system of FIG. 2 may be a pipe between the heat storage unit 2 and the four-way switching valve 6, but the oxygen supply nozzle 24 on the burner side of the heat storage unit 2 and the heat storage unit It is desirable to install between them. In addition, another oxygen concentration measuring device (not shown) is installed between the oxygen supply nozzle 24 and the fuel nozzle 4 to adjust the amount of oxygen to be blown, and a flow control valve (not shown) is provided in the oxygen supply system 26. ) Can be installed to control the oxygen input.

The oxygen supply time schedule is shown in FIG.
In the case of the method of FIG. 2, not only FIG. 5, but also FIGS.
It is also possible to install a flow control valve (not shown) in the oxygen supply system 26 to control the amount of oxygen input arbitrarily.

In the above-described manner, the combustion control is performed while the combustion exhaust gas filled in the pipe or the like between the heat storage body 2 and the four-way switching valve 6 is pushed out by the combustion air flowing in from the four-way switching valve 6, and the combustion is controlled. The air for use flows into the B burner and continues the combustion, and after a certain time, the main controller 23 transmits a combustion switching signal from the B burner to the A burner. The combustion as described above is alternately performed by the A and B burners, and is continued according to the instruction of the main controller 23.

[0033] Instead of oxygen, a gas containing oxygen may be used as the supporting gas to be injected into the combustion exhaust gas. As such a supporting gas, air is preferable.

[Embodiment 2] FIGS. 3 and 4 are system diagrams showing the configuration of a regenerative burner for carrying out Embodiment 2 of the combustion method of the present invention. The operation of this embodiment performed by the apparatus shown in FIGS. 3 and 4 will be described. FIG.
FIG. 9 and FIG. 9 are explanatory diagrams showing the operation in this embodiment.

As in the first embodiment, first, an appropriate amount of fuel and air are supplied to the pilot burner 5 on the A burner side, and the fuel is ignited by the spark of the ignition ignition. The main burner combustion air supplied by the blower 12 passes through the four-way switching valve 6, the flow measurement orifice 8, and the combustion air flow regulating valve 7,
The preheated air is passed through the heat storage body 2 and becomes high-temperature (700 to 1000 ° C.) preheated air. The preheated air is supplied to the main burner and reacts with the fuel injected from the main burner fuel nozzle 4 to burn.

A time schedule is stored in the main controller 23 in advance, and a command signal is transmitted to the main burner controller 22. The combustion exhaust gas is discharged into the furnace 1, and is discharged from the B burner through the B burner side regenerator 2 by the combustion exhaust gas suction blower 13 via the four-way switching valve 6. The sensible heat of the discharged flue gas passes through the B burner-side regenerator 2 and is collected by the regenerator 2.

Immediately before the combustion switching, the oxygen supply cutoff valve 25 is contained in the furnace gas (combustion exhaust gas) that has passed through the B burner-side regenerator 2.
Opens, and the oxygen injected from the oxygen supply nozzle 24 is mixed. The timing at which the oxygen supply cutoff valve 25 opens is determined by the engineering of the equipment, that is, the pipe capacity between the heat storage unit 2 and the four-way switching valve 6, and is previously stored in the pipe at the time of combustion switching, at the time of the next combustion, that is, B While the flue gas is being pushed out to the burner, the time required for the fuel injected from the fuel nozzle 4 of the B burner to be filled with a mixed gas of the flue gas and oxygen, which contains the amount of oxygen necessary for combustion, By allowing the main controller 23 to store a time schedule for opening the oxygen supply cutoff valve 25 before switching to combustion and transmitting an operation instruction signal I, the time between the regenerator 2 and the four-way switching valve 6 is switched before switching to combustion. It is possible to fill the inside of the pipe with a mixed gas of combustion exhaust gas and oxygen.

In FIG. 3, the oxygen supply nozzle 24 is provided on the side of the four-way switching valve of the heat storage element 2, but this oxygen supply nozzle 24 is provided on the burner side of the heat storage element 2 as shown in FIG. May be installed. In the case of FIG. 4, the oxygen supply nozzle 24 is
Since the burner is exposed to high-temperature furnace gas (combustion exhaust gas) during non-combustion, heat-resistant measures (using heat-resistant metal, ceramics, etc.) are required. In the method of FIG. While oxygen cannot be supplied to the exhaust gas, the partial pressure of oxygen in all the combustion exhaust gas flowing into the burner can be increased in the method of FIG.

The oxygen concentration in the flue gas is measured by an oxygen concentration measuring device 11 to confirm that the oxygen has reached the regenerator 2, that is, an oxygen supply shutoff valve until the specified oxygen concentration in the flue gas is reached. 25 may be opened. In the case of the oxygen concentration measurement method, not only can the oxygen concentration in the gas be managed and safety is improved, but also by monitoring the time during which the oxygen supply cutoff valve 25 is open, equipment diagnosis of the heat storage burner can be performed as described above. .

The installation position of the oxygen concentration measuring device 11 may be a pipe between the heat storage unit 2 and the four-way switching valve 6 (see FIGS. 1 and 2 of the first embodiment), but in the second embodiment, the four-way switching valve is used. No. 6 is installed on the exhaust gas discharge side. This is a four-way switching valve 6
The four-way switching valve 6
It can be confirmed that sufficient oxygen is contained in the combustion exhaust gas present inside, and not only the safety is improved, but also in the case where it is installed in the pipe between the heat storage body 2 and the four-way switching valve 6, A, B
In contrast to the necessity of installing the oxygen concentration measuring device 11 on both sides of the burner, when the oxygen concentration measuring device 11 is installed on the combustion exhaust gas outlet side of the four-way switching valve 6, only one location is required and the equipment cost can be reduced.

In order to adjust the amount of oxygen to be blown, another oxygen concentration measuring device (not shown) is provided between the oxygen supply nozzle 24 and the four-way switching valve 6 to adjust the flow rate in the oxygen supply system 26. It is also possible to install a valve (not shown) to control the oxygen input.

The time schedule of the oxygen supply is shown in FIG.
In the case of the system shown in FIG. 4, it is possible to install a flow control valve (not shown) in the oxygen supply system 26 to control the amount of oxygen input arbitrarily in addition to FIG.

In the above-described manner, the oxygen content in the combustion exhaust gas filled in the pipes and the like between the heat storage body 2 and the four-way switching valve 6 is increased, and the high-oxygen-concentration combustion exhaust gas flows from the four-way switching valve 6 for combustion. The combustion is performed as a substitute for the combustion air while being pushed out by the air, and then the combustion air flows into the B burner to continue the combustion. After a certain period of time, the main controller 23 sends a combustion switching signal from the B burner to the A burner. Is transmitted. The combustion as described above is alternately performed by the A and B burners, and is continued according to the instruction of the main controller 23.

[0044]

As apparent from the above description, the method of the present invention has the following industrially useful effects. The first burner and the second burner are paired, and one or a plurality of pairs of burners are arranged in one combustion chamber (furnace). Each burner has a heat storage body through which combustion air and combustion exhaust gas pass. Then, the first burner group and the second burner group are alternately burned, and when the burner is not burning, the heat of the combustion exhaust gas passing through the regenerator of the burner is transferred and stored in the regenerator, and the combustion is performed. In a regenerative burner that repeats a cycle in which the combustion air passing through the heat stored in the heat storage body is sometimes extracted and preheated (heated), immediately after the combustion is switched, in the piping from the heat storage body to the four-way switching valve on the combustion side burner While the combustion exhaust gas is pushed out to the burner by the combustion air into the regenerator, the oxygen in the flue gas flowing into the regenerator, the gas containing oxygen, the other flammable gas and the gas containing the flammable gas Our By arranging a device for introducing one of them (hereinafter referred to as "oxygen or other supporting gas"), the fuel and the combustion exhaust gas containing the injected oxygen or other supporting gas react and burn. It is possible to perform the switching combustion (alternating combustion) without the exhaust gas purge time at the time of switching the combustion, that is, without the dead time.

Immediately before the switching of combustion, a device for introducing a supporting gas such as oxygen into the combustion exhaust gas after passing through the regenerator on the non-combustion burner side and extracting heat is arranged, so that the non-combustion side burner is It is possible to fill with the combustion exhaust gas containing the supporting gas such as oxygen injected into the pipe from the heat storage element to the four-way switching valve, and the pipe from the heat storage element to the four-way switching valve on the combustion side burner immediately after the combustion switching. While the flue gas containing combustible gas such as oxygen is injected into the burner by the combustion air into the regenerator, the fuel and the flue gas containing combustible gas such as oxygen react and burn. It is possible to perform the switching combustion without the exhaust gas purging time at the time of switching the combustion, that is, without the dead time.

Immediately after the combustion switching, while the combustion exhaust gas in the pipe from the regenerator to the four-way switching valve is pushed out to the regenerator by the combustion air at the combustion side burner, oxygen and the like are contained in the preheated flue gas passing through the regenerator. By arranging a device for supplying the supporting gas of the above, it becomes possible to react and burn the combustion exhaust gas containing the supporting gas such as oxygen with the fuel, and the exhaust gas purging time at the time of fuel switching, that is, the dead time Switching combustion (alternating combustion) can be performed without the need.

[0047] By arranging a device for introducing the supporting gas such as oxygen to be injected into the combustion exhaust gas into the combustion exhaust gas before flowing into the regenerator on the non-combustion burner side, the non-combustion side burner can be provided. It is possible to fill the pipe from the heat storage body to the four-way switching valve with a gas containing a supportive gas such as oxygen. While the combustion exhaust gas containing the combustion supporting gas is pushed out to the regenerator by the combustion air to the burner, the fuel and the combustion exhaust gas containing the combustion supporting gas such as oxygen can react and burn. , The switching combustion (alternate combustion) can be performed without dead time.

In the above-described method, the concentration of a supporting gas such as oxygen in a mixed gas of the supporting gas such as oxygen and the supporting gas such as oxygen introduced into the flue gas is detected,
A device for controlling the amount of oxidizing gas such as oxygen is arranged, and the concentration (amount) of oxidizing gas such as oxygen sent to the combustion side burner
By checking, malfunction of each supply control device of the supporting gas such as fuel, air, oxygen, etc. can be prevented, and safety is improved.

From the above, the exhaust gas purging time at the time of combustion switching, that is, switching combustion (alternating combustion) without dead time
It is possible to obtain a combustion method for a regenerative burner capable of increasing the size of equipment and reducing exhaust loss.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an apparatus configuration of a regenerative burner for implementing a combustion method of the present invention.

FIG. 2 is a system diagram showing an apparatus configuration of a regenerative burner for implementing a combustion method of the present invention.

FIG. 3 is a system diagram showing an apparatus configuration of a regenerative burner for implementing a combustion method of the present invention.

FIG. 4 is a system diagram showing an apparatus configuration of a regenerative burner for implementing the combustion method of the present invention.

FIG. 5 is an explanatory diagram showing an operation in the first embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an operation in the first embodiment of the present invention.

FIG. 7 is an explanatory diagram illustrating an operation according to the first embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an operation in Embodiment 2 of the present invention.

FIG. 9 is an explanatory diagram showing an operation in Embodiment 2 of the present invention.

FIG. 10 is a system diagram showing an example of a conventional regenerative burner.

FIG. 11 is an explanatory diagram showing an operation of a conventional regenerative burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion chamber (furnace) 2 Heat storage body 3 Main burner fuel header 4 Main burner fuel nozzle 5 Pilot burner 6 Four-way switching valve 7 Main combustion air flow control valve 8 Main combustion air flow measurement device (orifice) 9 Main fuel flow control Valve 10 Main fuel flow meter (orifice) 11 Oxygen concentration meter 12 Combustion air push-in blower 13 Combustion exhaust gas suction blower 14 Main fuel shut-off valve (solenoid valve) 15 Pilot burner Combustion air shut-off valve (solenoid valve) 16 Pilot burner Fuel shutoff valve 17 Main burner combustion air system 18 Combustion exhaust gas exhaust system 19 Main burner fuel supply system 20 Pilot burner fuel supply system 21 Pilot burner combustion air supply system 22 Individual main burner combustion control device (controller) 23 Thermal storage burner main control Equipment (controller) 24 Oxygen supply nozzle 25 Oxygen supply shutoff valve ( Magnetic valve) 26 Oxygen supply system A14 Main fuel cutoff valve control signal A15 Pilot burner combustion air cutoff valve control signal A16 Pilot burner fuel cutoff valve control signal B Four-way switching valve control signal C Each main burner control signal from main controller D Main combustion air flow signal E Main combustion air flow control valve control signal F Main fuel flow signal G Main fuel flow control valve control signal H Gas oxygen concentration signal I Oxygen shutoff valve control signal 110 Regenerative burner 112 Furnace 114 Burner 116 Combustion air / exhaust passage 118 Regenerator 120 Combustion blower 121 Fan inlet 122 Air valve 124 Exhaust valve 126 Connection 127 Control valve

────────────────────────────────────────────────── ─── Continuing on the front page (72) Ryoichi Tanaka, Inventor 2-1-1, Shirite, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Furness Industry Co., Ltd. (72) Mamoru Matsuo 2-1-1 Shirite, Tsurumi-ku, Yokohama-shi, Kanagawa No. 53 Japan Furnace Industry Co., Ltd. (72) Inventor Jun Sudo 2-53-1, Shirate, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Japan Furnace Industry Co., Ltd. (56) References JP 6-23605 (JP, B2 (58) Field surveyed (Int.Cl. ⁶ , DB name) F23D 14/66 F23L 15/02

Claims (6)

(57) [Claims] A first burner and a second burner are paired, and a pair or a plurality of pairs of burners are arranged in one combustion chamber, and each burner is a heat storage element through which combustion air and combustion exhaust gas respectively pass. Wherein the first burner group and the second burner group are alternately burned, and when the burner is not burning, the heat of the combustion exhaust gas passing through the heat storage body of the burner is transferred to the heat storage body, where the heat is stored. In a combustion method of a regenerative burner that repeats a cycle in which the combustion air passing through the heat stored in the regenerator during combustion of the burner is extracted and preheated, immediately after the combustion is switched, the four-way switching valve is used in the combustion side burner from the regenerator. While the flue gas in the pipes is pushed out to the regenerator by the burner by the combustion air, oxygen is injected into the flue gas flowing into the regenerator, and the flue gas containing fuel and the injected oxygen is injected. Combustion method for regenerative burner, which comprises burning reacted and. 2. A pair of a first burner and a second burner, a pair or a plurality of pairs of burners are arranged in one combustion chamber, and each burner is a heat storage element through which combustion air and combustion exhaust gas pass. Wherein the first burner group and the second burner group are alternately burned, and when the burner is not burning, the heat of the combustion exhaust gas passing through the heat storage body of the burner is transferred to the heat storage body, where the heat is stored. In a regenerative burner combustion method that repeats a cycle in which the combustion air that passes through the heat stored in the heat storage body during combustion of the burner is extracted and preheated, the burner passes through the heat storage body on the non-burning burner side immediately before switching to combustion. Oxygen is injected into the combustion exhaust gas after being heated, and the combustion exhaust gas containing the input oxygen is filled in the pipe from the heat storage body of the non-combustion side burner to the four-way switching valve. Cut from heat storage body on all sides While the combustion exhaust gas containing the injected oxygen in the pipe to the valve is pushed out to the burner by the combustion air by the combustion air, the fuel and the combustion exhaust gas containing the injected oxygen are reacted and burned. Type burner combustion method. 3. A pair of a first burner and a second burner, a pair or a plurality of pairs of burners are arranged in one combustion chamber, and each burner is a heat storage element through which combustion air and combustion exhaust gas respectively pass. Wherein the first burner group and the second burner group are alternately burned, and when the burner is not burning, the heat of the combustion exhaust gas passing through the heat storage body of the burner is transferred to the heat storage body, where the heat is stored. In the combustion method of the regenerative burner, which repeats a cycle in which the combustion air passing through the heat stored in the regenerator when the burner burns is extracted and preheated, immediately after the combustion is switched, the four-way switching valve is switched from the regenerator to the combustion side burner immediately after the combustion switching. While the flue gas in the pipe up to is pushed out to the burner by the combustion air into the regenerator, oxygen is injected into the preheated flue gas that has passed through the regenerator, and the fuel and the flue gas containing the injected oxygen are added. Combustion method for regenerative burner, which comprises burning by response. 4. A pair of a first burner and a second burner, a pair or a plurality of pairs of burners are arranged in one combustion chamber, and each burner is a heat storage element through which combustion air and combustion exhaust gas respectively pass. Wherein the first burner group and the second burner group are alternately burned, and when the burner is not burning, the heat of the combustion exhaust gas passing through the heat storage body of the burner is transferred to the heat storage body, where the heat is stored. In a combustion method of a regenerative burner in which a burner repeats a cycle in which the combustion air that passes through the heat stored in the regenerator during combustion burns and is preheated, the burner immediately passes through a regenerator on a non-combustion burner immediately before switching to combustion. Oxygen is injected into the combustion exhaust gas of the above, the combustion exhaust gas containing the injected oxygen is filled in the pipe from the heat storage body of the non-combustion side burner to the four-way switching valve, and immediately after combustion switching, the combustion side burner uses the combustion side burner to perform four-way operation. Up to switching valve While the combustion exhaust gas containing the injected oxygen in the piping is pushed out to the burner by the combustion air into the regenerator, the fuel and the combustion exhaust gas containing the injected oxygen react with each other and burn. Burning method. 5. The heat storage according to claim 1, wherein a concentration of the oxygen in a mixed gas composed of combustion exhaust gas and oxygen introduced into the combustion exhaust gas is detected to control the oxygen amount. Type burner combustion method. 6. The combustion method for a regenerative burner according to claim 1, wherein a gas containing oxygen is introduced into the combustion exhaust gas instead of oxygen.