CN219328095U - Burner with a burner body - Google Patents

Abstract

The utility model discloses a burner, comprising: the first air box and the second air box are respectively used for providing combustion-supporting fuel gas; the first flame tube and the second flame tube are axially arranged on the periphery of the first flame tube, a first valve is arranged at one end, far away from the first flame tube, of the first flame tube and the first bellows, and a second valve is arranged at one end, far away from the second flame tube, of the second bellows. The burner is provided with a first valve at one end of the first air box far away from the first flame tube and a second valve at one end of the second air box far away from the second flame tube by setting the first air box and the second air box. The burner utilizes the first bellows to independently provide combustion-supporting gas for the first flame tube, and the second bellows to independently provide combustion-supporting gas for the second flame tube, so that the treatment of low-heat-value waste gas is realized, and the requirement of high-flow waste gas low-nitrogen incineration treatment is met.

Description

Burner with a burner body

Technical Field

The utility model relates to the technical field of combustion equipment, in particular to a combustor.

Background

The direct combustion incinerator is a device for treating waste by adopting a direct combustion method, and the waste is thoroughly burnt, oxidized and decomposed by utilizing the high temperature generated by combustion-supporting fuel so as to achieve the aim of clean emission. Along with the continuous improvement of the environmental protection requirements of China, toxic and harmful waste gas generated in the chemical production process is burnt by adopting a direct-fired incinerator, so that the method is the most effective way for disposing the waste gas. In the production process of chemicals in the chemical industry, a large amount of waste gas is generated, and the waste gas has the characteristics of complex components, unstable flow, unstable heat value, low conveying pressure and the like, so that the waste gas cannot be used as a stable waste gas to be introduced into an incineration device for treatment.

Disclosure of Invention

The utility model provides a combustor, which is used for solving the problem that the existing combustor cannot meet the requirement of low-nitrogen incineration treatment of high-flow waste gas.

The present utility model provides a burner comprising: the first air box and the second air box are respectively used for providing combustion-supporting fuel gas; the first flame tube and the second flame tube are arranged on the periphery of the first flame tube along the axial direction, a first valve is arranged at one end of the first air box, which is far away from the first flame tube, and a second valve is arranged at one end of the second air box, which is far away from the second flame tube.

In some embodiments, the first flame tube is provided with a first casting layer and the second flame tube is provided with a second casting layer.

In some embodiments, the first bellows opens a first opening and the second bellows opens a second opening, the first opening being in communication with or out of communication with the first valve and the second opening being in communication with or out of communication with the second valve; when the first opening is communicated with the first valve, the first opening, the first bellows and the first flame tube are communicated to form a first air channel, and when the second opening is communicated with the second valve, the second opening, the second bellows and the second flame tube are communicated to form a second air channel.

In some embodiments, the first air duct includes a center layer for channeling direct current air and the second air duct is for channeling direct current air.

In some embodiments, the first air duct further comprises an inner ring layer disposed at an outer periphery of the central layer, the inner ring layer for introducing swirl air.

In some embodiments, the burner further comprises an inner ring gas lance and an outer ring exhaust gas lance, the inner ring gas lance is arranged in the first flame tube, the inner ring gas lance is used for providing high heat value gas for the first flame tube, the outer ring exhaust gas lance is arranged in the second flame tube, and the outer ring exhaust gas lance is used for providing low heat value exhaust gas when the temperature of the second flame tube reaches a first preset temperature.

In some embodiments, the first flame tube and the second flame tube are connected to form a furnace, and when the percentage of oxygen concentration in the furnace is greater than a preset percentage of oxygen concentration and the furnace temperature is lower than the first preset temperature, the inner ring gas spray gun provides an increase in the flow rate of the high heating value gas; when the oxygen concentration percentage in the hearth is equal to the preset oxygen concentration percentage, the first air box supplements the combustion-supporting fuel gas.

In some embodiments, the inner ring gas lance includes a first gas lance and an afterburner gas lance, the first gas lance being disposed in the first barrel in spaced relation to the afterburner gas lance, the first gas lance being configured to provide the high heating value gas, the afterburner gas lance being configured to provide the high heating value gas when the first barrel temperature is less than a second preset temperature.

In some embodiments, the post-combustion gas lance comprises a second gas lance and a third gas lance disposed in spaced relation to each other, the first gas lance being disposed in spaced relation to the second gas lance and the third gas lance, respectively, the second gas lance being configured to provide the high heating value gas and the third gas lance being configured to provide either the high heating value exhaust gas or the high heating value gas.

In some embodiments, the first gas lance is disposed at a central location of the first flame tube, the second gas lance is disposed at an outer periphery of the first gas lance along the axial direction, and the third gas lance is disposed at an outer periphery of the second gas lance along the axial direction.

The burner provided by the utility model comprises: the first air box and the second air box are respectively used for providing combustion-supporting fuel gas; the first flame tube and the second flame tube are arranged on the periphery of the first flame tube along the axial direction, the first valve is arranged at one end, far away from the first flame tube, of the first bellows, and the second valve is arranged at one end, far away from the second flame tube, of the second bellows. According to the burner, the first air box and the second air box are set, the first valve is arranged at one end, far away from the first flame tube, of the first air box, the second valve is arranged at one end, far away from the second flame tube, of the second air box, accordingly, combustion-supporting gas is independently provided for the first flame tube by the first air box, combustion-supporting gas is independently provided for the second flame tube by the second air box, low-heat-value waste gas treatment is achieved, and the requirement of high-flow waste gas low-nitrogen incineration treatment is met.

Drawings

The technical solution and other advantageous effects of the present utility model will be made apparent by the following detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a burner of the present utility model;

FIG. 2 is a burner panel layout;

FIG. 3 is a burner head layout;

the reference numerals are: 110-first bellows, 210-second bellows, 310-first flame tube, 320-second flame tube, 311-first casting layer, 321-second casting layer, 111-first opening, 211-second opening, 130-inner ring gas spray gun, 140-first gas spray gun, 150-second gas spray gun, 160-third gas spray gun, 220-outer ring waste gas spray gun, 221-third inlet, 170-ignition gun, 120-flame stabilizing disc, 180-fire detection and 190-fire observation hole.

Detailed Description

Specific embodiments of the burner according to the present utility model will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 to 3, the present utility model provides a burner, particularly a low-nitrogen gas burner for low-calorific-value exhaust gas. The burner comprises: a first windbox 110 and a second windbox 210, the first windbox 110 and the second windbox 210 being used for providing combustion supporting gas respectively; a first flame tube 310 and a second flame tube 320, the second flame tube 320 being provided on the outer periphery of the first flame tube 310 along the axial direction X; the first bellows 110 is provided with a first valve at an end thereof remote from the first flame tube 310, and the second bellows 210 is provided with a second valve at an end thereof remote from the second flame tube 320. First valve

The present application sets the conventional one bellows as the first bellows 110 and the second bellows 210 independently, such that the first bellows 110 is disposed at an end far from the first flame tube 310 and the second bellows 210 is disposed at an end far from the second flame tube 320, thereby the first bellows 110 independently provides combustion supporting gas for the first flame tube 310 and the second bellows 210 independently provides combustion supporting gas for the second flame tube 320.

As shown in fig. 1, the first air box 110 is provided with a first inlet 111, the first inlet 111 is connected with a first valve, the first valve is used for controlling the first inlet 111 to be opened so as to be communicated with the first air box 110, or the first valve is used for controlling the first inlet 111 to be closed so as to be disconnected with the first air box 110, when the first air box 110 is communicated with the first inlet 111, the first air box 110 and the first inlet 111 form a first air channel, combustion-supporting gas enters the first air channel from the first inlet 111 into the first air box 110, so that the first air box 110 provides combustion-supporting gas for the first flame tube 310; similarly, the second air box 210 is provided with a second inlet 211, the second inlet 211 is connected with a second valve, the second valve is used for controlling the second inlet 211 to be opened so as to be communicated with the second air box 210, or the second valve is used for controlling the second inlet 211 to be closed so as to be disconnected with the second air box 210, when the second air box 210 is communicated with the second inlet 211, the second inlet 211 is communicated with the second air box 210 to form a second air channel, and combustion-supporting gas enters the second air channel from the second inlet 211, namely, enters the second air channel, so that the second air box 210 provides combustion-supporting gas for the second flame tube 320. That is, the first valve and the second valve are used to adjust the amount of the combustion supporting gas introduced into the first inlet 111 and the amount of the combustion supporting gas introduced into the second inlet 211, respectively. In some embodiments, the combustion-supporting gas may be natural gas, such as specifically methane or other high heating value fuel, which is used to organize a good combustion dynamic field.

In some embodiments, the first bellows 110 is divided into two layers to divide the first duct into a central layer and an inner ring layer, respectively, the combustion-supporting gas of the central layer is divided into a central wind, and the combustion-supporting air of the inner ring layer is an inner ring wind. And in some embodiments, the second air duct of the second air box 210 is ventilated with the direct-current air, on one hand, the direct-current air provides combustion air, and on the other hand, the direct-current air is ventilated into the second air duct, which is equivalent to forming an air isolation layer on the outer wall of the burner, so that the temperature of the inner wall of the burner or the incinerator can be reduced appropriately.

In some embodiments, the combustion gas entering the first wind box 110 is air, and in order to reduce the generation of nitrogen oxides (NOx), the combustion gas entering the first wind channel adopts a method of supplementing recirculated flue gas to reduce the oxygen content in the air.

In this application embodiment, combustion-supporting gas divide into 2 ~ 3 layers in first wind channel and second wind channel, divide into combustion-supporting gas from interior to exterior in proper order in space: the direct current wind, the rotational flow wind and the direct current wind, namely, the combustion area of the central gas is correspondingly introduced with the direct current wind, the combustion area of the middle-circle gas is correspondingly introduced with the rotational flow wind, the middle-circle gas and the corresponding combustion-supporting gas can be canceled according to actual conditions, and the combustion area of the outer-circle gas is correspondingly introduced with the direct current wind.

As shown in fig. 1, the first flame tube 310 is provided with a first casting layer 311, and the second flame tube 320 is provided with a second casting layer 321. The first casting layer 311 and the second casting layer 321 are both refractory casting material layers.

As shown in fig. 1, in the embodiment of the present application, the combustor further includes an inner ring gas spray gun 130 and an outer ring exhaust gas spray gun 220, the inner ring gas spray gun 130 is disposed in the first flame tube 310, the outer ring exhaust gas spray gun 220 is disposed in the second flame tube 320, that is, the outer ring exhaust gas spray gun 220 is disposed at the periphery of the inner ring gas spray gun 130, wherein the inner ring gas spray gun 130 is used for providing high heating value gas in the first flame tube 310, and the outer ring exhaust gas spray gun 220 is used for providing low heating value exhaust gas when the second flame tube 320 reaches the first preset temperature. The outer ring exhaust gas lance 220 is provided with a third inlet 221 for introducing low heating value exhaust gas, and the inner ring gas lance 130 corresponds to an inner ring and the outer ring exhaust gas lance 220 corresponds to an outer ring compared with the outer ring exhaust gas lance 220.

Because the outer ring exhaust gas spray gun 220 outputs the uncertainty of the low heat value exhaust gas, the outer ring exhaust gas spray gun 220 is arranged on the outer ring of the inner ring gas spray gun 130 in design, on one hand, the high heat value exhaust gas can be treated through the high temperature flue gas generated by the burner in a thermal oxidation mode, and on the other hand, the outer ring exhaust gas spray gun 220 is arranged on the outer ring of the burner, so that the flame influence on the inner ring of the burner is reduced to the minimum.

The low heat value exhaust gas of the outer ring exhaust gas spray gun 220 comprises a large amount of non-combustible components, mainly nitrogen, oxygen, water and carbon dioxide, wherein the non-combustible components account for more than 80%, the low heat value exhaust gas cannot be continuously and stably combusted when being singly combusted, and gas is required to provide a stable heat source, namely the inner ring gas spray gun 130 provides high heat value gas, and the fuel gas is high heat value gas, can be mixed gas of natural gas, methane gas, hydrogen and the like, or can be collectively called as "gas", so as to ensure that toxic and harmful organic matters in the exhaust gas are fully pyrolyzed.

In some preferred embodiments, the first flame tube 310 and the second flame tube 320 are connected to form a furnace, when the oxygen concentration of the furnace is greater than the preset oxygen concentration and the furnace temperature is lower than the first preset temperature, the flow rate of the fuel gas provided by the inner ring fuel gas spray gun 130 is increased, and when the oxygen concentration of the furnace is equal to the preset oxygen concentration, the first air box 110 supplements the combustion supporting fuel gas.

In some embodiments, the value of the first preset temperature is 800 ℃.

In some embodiments, the preset oxygen concentration percentage is equal to 3%.

In the embodiment of the present application, the inner ring gas lance 130 includes a first gas lance 140 and an afterburner gas lance, the afterburner gas lance is disposed around an outer circumference of the first gas lance 140, the first gas lance 140 and the afterburner gas lance are disposed in the first flame tube 310, the first gas lance 140 is configured to provide high heating value gas, the afterburner gas lance is configured to provide the high heating value gas when the temperature of the first flame tube 310 is lower than a second preset temperature, and the first windbox 110 is configured to provide combustion supporting gas for the high heating value gas.

Further in some preferred embodiments, the post-combustion gas lance includes a second gas lance 150 and a third gas lance 160 disposed at a distance from each other, the first gas lance 140 being disposed at a distance from the second gas lance 150 and the third gas lance 160, respectively, the second gas lance 150 for providing the post-combustion gas when the temperature of the first liner 310 is lower than a second preset temperature, the third gas lance 160 for providing the high heating value exhaust gas or the high heating value gas, and the first windbox 110 for providing the post-combustion gas with the combustion gas; in some embodiments, the third gas injection lance 160 includes a high heating value exhaust gas injection lance 162 and a gas injection lance 161 disposed in a spaced apart relationship, the high heating value exhaust gas injection lance 162 for providing high heating value exhaust gas and the gas injection lance 161 for providing gas. The first gas lance 140, the second gas lance 150, and the third gas lance 160 are compared, the first gas lance 140 is located at a central position, the third gas lance 160 is located at an inner ring position of the outer ring exhaust gas lance 220, the second gas lance 150 is located at a middle ring position between the first gas lance 140 and the third gas lance 160, and the outer ring gas lance 220 is located at an outer ring position of the inner ring gas lance 130.

In some embodiments, the second preset temperature ranges from 900 ℃ to 1100 ℃.

In this burner, the first windbox 110, the second windbox 210, the first flame tube 310 and the second flame tube 320 are coaxially arranged along the axial direction X. The first gas spray gun 140 is provided with a nozzle for outputting central gas, the nozzle is located at the central position of the first flame tube 310, the second gas spray gun 150 is arranged at intervals with the first gas spray gun 140 along the axial direction X, the second gas spray gun 150 is provided with a plurality of nozzles, the plurality of nozzles of the second gas spray gun 150 are circumferentially distributed in the first flame tube 310 at intervals around the axial direction X, the third gas spray gun 160 is arranged at intervals with the second gas spray gun 150 along the axial direction X, the third gas spray gun 160 is provided with a plurality of nozzles, and the plurality of nozzles are circumferentially distributed in the first flame tube 310 around the axial direction X. The arrangement of the exhaust gas and the fuel gas in the above embodiments of the present application is staggered and arranged in circles at intervals, and in other embodiments, the arrangement is not limited to this arrangement, and may be arranged at intervals in the same circle.

The flow rate of the low-heating-value exhaust gas from the outer ring gas lance 220 is controlled individually by the valves for the high-heating-value gas from the first gas lance 140, the second gas lance 150, and the third gas lance 160.

In a preferred embodiment, the center gas of the first gas lance 140 acts as a pilot flame that, upon ignition, forms a stable flame. When the temperature of the hearth is lower than the range of the design requirement, for example, 900-1100 ℃, the hearth is supplemented with fuel gas for combustion, and the types of the fuel gas can be increased or decreased according to actual conditions. The first, second, and third gas guns 140, 150, and 160 may treat different kinds of gas or exhaust gas, respectively.

In some embodiments, the first flame tube 310 and the second flame tube 320 are both cylindrical structures, and the third gas injection lance 160 is disposed at a distance from the first gas injection lance 140 in the radial direction of the first flame tube 310. The second gas injection lance 150 is disposed at a distance from the first gas injection lance 140 in the radial direction of the first flame tube 310. Also, in some embodiments, the plurality of third gas injection lances 160 are circumferentially spaced apart and the plurality of second gas injection lances 150 are circumferentially spaced apart.

In the embodiment of the present application, the burner further comprises an ignition gun 170, the ignition gun 170 is arranged in a direction biased to the central gas direction, the ignition gun 170 has an ignition end, the ignition end is disposed in the first flame tube 310, and the ignition gun 170 is used for igniting the central gas of the first gas spray gun 140, so that the first gas spray gun 140 releases a stable flame and forms a combustion area of the gas. And, the combustion of the center gas ignites the afterburner gas and the high calorific value exhaust gas. When the system ignites, the center flame is first ignited by the ignition gun 170, and then the flame spreads out from inside to outside until the entire burner is ignited.

In some embodiments of the present application, the burner further includes a flame stabilizing plate 120, the flame stabilizing plate 120 is disposed in the first flame tube 310, the combustion supporting gas provided by the first air box 110 flows through the flame stabilizing plate 120 and enters the combustion area of the gas, and the combustion supporting gas provided by the second air box 210 flows through the flame stabilizing plate 120 and enters the combustion area of the high heat value exhaust gas. The flame stabilizing tray 120 in the above embodiments of the present application is a dc flame stabilizing tray, and in other embodiments is not limited to the above arrangement, and the difference between the above embodiments is that the flame stabilizing tray 120 may be replaced by a swirl tray.

In addition, the burner further comprises a plurality of fire detectors 180, a plurality of fire observation holes 190 and a stable combustion assembly, wherein combustion air enters the burner from the first air box 110 and the second air box 210, and enters the combustion areas of the first flame tube 310 and the second flame tube 320 respectively after being reasonably distributed by the stable combustion assembly of the burner. Under the action of the flame stabilizing plate 120, a low-speed backflow area is formed in the combustion area of the burner, so that the condition that flame is out of fire due to direct blowing of combustion-supporting fuel gas is prevented.

When the burner is actually operated, the working process is as follows: firstly, igniting the ignition gun 170, judging by a fire detector 180 of ignition flame after the flame of the ignition gun 170 is stable, introducing central fuel gas into the first fuel gas spray gun 140, igniting the central fuel gas by the ignition gun 170, closing the ignition gun 170 after the flame of the central fuel gas is stable, and igniting by utilizing the fire detector 180 to obtain two from three; after the hearth temperature reaches the first preset temperature, namely the preset waste gas incineration temperature, the outer ring waste gas spray gun 220 slowly introduces waste gas, in the process of increasing the waste gas flow, the system feeds back the hearth oxygen concentration and hearth temperature value of the burner, when the hearth oxygen concentration is higher than 3%, the hearth temperature is lower than 800 ℃, the fuel flow is slowly increased, and when the hearth oxygen content of the burner is close to 3%, the combustion-supporting fuel flow needs to be properly supplemented. And slowly lifting the load of the burner according to the process flow.

When the burner stably operates and the furnace temperature has reached the second preset temperature, that is, the furnace temperature reaches 900 ℃, the outer ring exhaust gas spray gun 220 slowly introduces low-heat-value exhaust gas into the second flame tube 320, and the flow of the low-heat-value exhaust gas needs to be adjusted according to the process requirements.

In some embodiments, the flow rate of the high heat value exhaust gas referred to herein is about 50Nm3/h, the heat value is 54965kJ/Nm3, the flow rate of the low heat value exhaust gas is about 200Nm3/h, the heat value is 350kJ/Nm3, and about 95% is nitrogen. It is to be noted that the burner of the present application includes, but is not limited to, exhaust gas incineration for the above-mentioned flow rates and heating values.

The post-combustion gas referred to in the above embodiments of the present application is 2 turns, and in other embodiments, the number of turns of the post-combustion gas is not limited to 2 turns, but may include, for example, 1 turn and 3 turns.

The high heat value exhaust gas referred to in the above embodiments of the present application is only 1, and in other embodiments, the high heat value exhaust gas is not limited to 1.

The low heating value exhaust gas referred to in the above embodiments of the present application is only 1, and in other embodiments, the high heating value exhaust gas is not limited to 1.

The burner of the application, through setting for first bellows 110 and second bellows 210, make first bellows 110 keep away from the one end of first flame tube 310 and set up first valve, make second bellows 210 keep away from the one end of second flame tube 310 and set up the second valve, thereby, first bellows 110 independently provides combustion-supporting gas for first flame tube 310, second bellows 210 independently provides combustion-supporting gas for second flame tube 320, the problem of burning low calorific value waste gas in the incinerator burner has been solved, through multi-level gas classification, air classification, can reduce the regional high temperature region of combustor flame region, make the combustor flame distribution more even, can obviously reduce the formation of nitrogen oxide (NOx). The unstable low-calorific-value waste gas of operating mode is arranged on the outer ring of the burner, so that the treatment effect of the low-calorific-value waste gas can be ensured, and the influence on main flame when the operating mode changes can be reduced to the minimum. The oxygen content of combustion-supporting fuel gas is reduced by supplementing recirculated flue gas into the air of the inner ring, and nitrogen oxides (NOx) of the burner are reduced again. The burner of the utility model utilizes the combustion dynamic field with good combustion supporting fuel structure to lead toxic and harmful organic components in the waste gas to be fully oxidized and pyrolyzed, thereby meeting the requirement of clean emission.

The foregoing is merely a preferred embodiment of the burner of the present utility model, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are also intended to be within the scope of the present utility model.

Claims (10)

1. A burner, comprising:

a first windbox (110) and a second windbox (210), the first windbox (110) and the second windbox (210) being respectively used for providing combustion-supporting gas;

first flame tube (310) and second flame tube (320), second flame tube (320) are located along axial (X) the periphery of first flame tube (310), first bellows (110) are kept away from the one end of first flame tube (310) sets up first valve, second bellows (210) are kept away from one end of second flame tube (320) sets up the second valve.

2. Burner according to claim 1, characterized in that the first flame tube (310) is provided with a first casting layer (311) and the second flame tube (320) is provided with a second casting layer (321).

3. The burner according to claim 1, wherein the first bellows (110) is provided with a first opening (111), the second bellows (210) is provided with a second opening (211), the first opening (111) is in communication with or disconnected from the first valve, and the second opening (211) is in communication with or disconnected from the second valve; when the first opening (111) is communicated with the first valve, the first opening (111), the first bellows (110) and the first flame tube (310) are communicated to form a first air channel, and when the second opening (211) is communicated with the second valve, the second opening (211), the second bellows (210) and the second flame tube (320) are communicated to form a second air channel.

4. A burner according to claim 3, wherein the first duct comprises a central layer for the passage of direct wind and the second duct is for the passage of direct wind.

5. The burner of claim 4, wherein the first duct further comprises an inner ring layer disposed about the periphery of the center layer, the inner ring layer configured to channel swirling wind.

6. The burner of claim 1, further comprising an inner ring gas lance (130) and an outer ring exhaust lance (220), the inner ring gas lance (130) being disposed within the first flame tube (310), the inner ring gas lance (130) being configured to provide high heating value gas to the first flame tube (310), the outer ring exhaust lance (220) being disposed within the second flame tube (320), the outer ring exhaust lance (220) being configured to provide low heating value exhaust gas when the second flame tube (320) temperature reaches a first preset temperature.

7. The burner of claim 6, wherein the first flame tube (310) and the second flame tube (320) are connected to form a furnace, wherein the inner ring gas lance (130) provides an increase in the flow of the high heating value gas when the percentage of oxygen concentration in the furnace is greater than a predetermined percentage of oxygen concentration and the furnace temperature is below the first predetermined temperature;

when the oxygen concentration percentage in the hearth is equal to the preset oxygen concentration percentage, the first air box (110) supplements the combustion-supporting fuel gas.

8. The burner of claim 6, wherein the inner ring gas lance (130) includes a first gas lance (140) and an afterburner gas lance, the first gas lance (140) being disposed in the first barrel (310) spaced apart from the afterburner gas lance, the first gas lance (140) being configured to provide the high heating value gas, the afterburner gas lance being configured to provide the high heating value gas when the first barrel (310) temperature is below a second preset temperature.

9. The burner according to claim 8, wherein the afterburner gas lance comprises a second gas lance (150) and a third gas lance (160) arranged at a distance from each other, the first gas lance (140) being arranged at a distance from the second gas lance (150) and the third gas lance (160), respectively, the second gas lance (150) being adapted to provide the high heating value gas and the third gas lance (160) being adapted to provide the high heating value exhaust gas or the high heating value gas.

10. The burner according to claim 9, wherein the first gas lance (140) is disposed at a central position of the first flame tube (310), the second gas lance (150) is disposed at an outer periphery of the first gas lance (140) along the axial direction (X), and the third gas lance (160) is disposed at an outer periphery of the second gas lance (150) along the axial direction (X).

Images