CN215112596U - Wall-attached flame ultralow NO for coking and hydrogenation devicexBurner with a burner head - Google Patents

Wall-attached flame ultralow NO for coking and hydrogenation devicexBurner with a burner head Download PDF

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Publication number
CN215112596U
CN215112596U CN202121166807.4U CN202121166807U CN215112596U CN 215112596 U CN215112596 U CN 215112596U CN 202121166807 U CN202121166807 U CN 202121166807U CN 215112596 U CN215112596 U CN 215112596U
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China
Prior art keywords
gas pipe
wall
valve core
gas
valve
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CN202121166807.4U
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杜俊
王光杰
杜承衍
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Changsha Xinzhong Petrochemical Equipment Co ltd
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Changsha Xinzhong Petrochemical Equipment Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

Wall-attached flame ultralow NO for coking and hydrogenation devicexCombustor belongs to combustor technical field. The method is characterized in that: the lower end of the internal gas pipe (2) extends out of the burner body, the upper end of the internal gas pipe (2) extends into the combustion chamber (12), the external gas pipe (6) is arranged outside the burner body, and the lower end of the external gas pipe (6) extendsThe gas supply device enters the burner body and is communicated with the internal gas pipe (2), the external gas pipe (6) is also connected with a gas supply device, the gas supply device is communicated with the bottom of the combustion chamber (12), and the upper ends of the external gas pipe (6) and the internal gas pipe (2) are provided with burners (11). The utility model discloses an outer gas pipe's lower extreme stretches into in the combustor main part to be linked together with interior gas pipe, and air supplement unit can send into outer gas pipe with the tail gas in the combustion chamber in, both guaranteed that the intraductal gas of outer gas preheats effectually, make the difference in temperature of interior gas pipe and outer gas pipe spun gas little, guarantee that the gas burning is more stable.

Description

Wall-attached flame ultralow NO for coking and hydrogenation devicexBurner with a burner head
Technical Field
Wall-attached flame ultralow NO for coking and hydrogenation devicexCombustor belongs to combustor technical field.
Background
The burner is a general name of a device which sprays and mixes (or sprays and mixes) fuel and air in a certain mode for combustion, and an industrial burner is commonly called a burner, has various types and specifications, and has several categories of fuel oil, gas (coal gas) and coal (coal powder/coal water slurry). The application fields are wide, and the combustor is required in industrial occasions where fuel needs to be combusted to heat materials or react.
Attach wall combustor is the combustor of establishment in wall one side, the whole outside that sets up at the combustor of outer gas pipe that attaches the wall combustor, and interior gas pipe sets up in the combustor, and the intraductal gas of interior gas is spout again after the combustor preheats, makes interior gas pipe spun gas temperature high, and outer gas pipe preheats in the combustor not, and the intraductal gas of outer gas is spouted to the combustion area by the combustor outward, leads to outer gas pipe spun gas to preheat the temperature low, makes the burning very unstable, the insufficient problem of burning appears easily.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: overcomes the defects of the prior art, provides a wall-attached flame ultralow NO device for coking and hydrogenation devices which can preheat the gas in the outer gas pipe and ensure the small temperature difference between the gas sprayed out of the outer gas pipe and the gas sent out of the inner gas pipexA burner.
The utility model provides a technical scheme that its technical problem adopted is: this coking and hydrogenation device is with ultralow NOx combustor of attaching wall flame, its characterized in that: including the combustor main part, internal combustion trachea, outer gas pipe and accent wind butterfly valve, the top of combustor main part is provided with the combustion chamber, the combustion chamber is attached to the wall setting, internal combustion trachea's lower extreme stretches out the combustor main part setting, internal combustion trachea's upper end extends in the combustion chamber, outer gas pipe sets up in the combustor main part outside, outer gas pipe's lower extreme stretches into in the combustor main part, and be linked together with internal combustion trachea, outer gas pipe still is connected with the air supplement unit, the bottom intercommunication of air supplement unit and combustion chamber, outer gas pipe and internal combustion trachea's upper end all is provided with the nozzle.
Preferably, the outer gas pipes are arranged side by side along the wall, the lower ends of the outer gas pipes are connected with outer gas pipe communicating pipes and communicated with each other, and the outer gas pipe communicating pipes are communicated with the inner gas pipe through outer gas pipe air inlet pipes extending into the combustor main body.
Preferably, the air supplementing device comprises an air supplementing pipe and an injector, a high-pressure medium inlet of the injector is communicated with the upper end of the outer gas pipe, a low-pressure medium inlet of the injector is communicated with the bottom of the combustion chamber through the air supplementing pipe, and a medium outlet of the injector is communicated with the burner. The tail gas at the bottom of the combustion chamber is sucked into the outer gas pipe through the ejector, so that the temperature of the gas in the outer gas pipe is increased, and the whole oxygen concentration can be reduced when the gas in the outer gas pipe is sprayed and combusted.
Preferably, the air supply pipe is provided with a pressure valve, and when the pressure at the output end of the pressure valve is greater than the pressure at the input end and the pressure difference reaches a specified value, the pressure valve is conducted. The pressure valve can switch on when output and input reach certain pressure differential, can be in outer gas intraductal gas after stably carrying, the ejector just inhales outer gas pipe with the tail gas of combustion chamber bottom.
Preferably, the pressure valve includes a valve body, a valve core and a spring, the valve body is a cylinder with two open ends, a conical sealing part with a diameter gradually decreasing along the airflow direction is arranged in the valve body, the valve core and the spring are both arranged in the valve body, the spring is connected with the valve core and pushes the valve core to compress the sealing part, and a sealing gasket is arranged at one end of the valve core close to the sealing part. The spring pushes the valve core to move and enables the sealing gasket to tightly press the sealing part, so that the valve body is sealed, and after certain pressure is reached, the valve core can be pushed to move and the sealing part is opened.
Preferably, the valve core is in a closed cylindrical shape at one end close to the sealing part, the outer diameter of the valve core is smaller than the inner diameter of the valve body, an outward flange is arranged at one end, far away from the sealing part, of the valve core, the outward flange is connected with the inner wall of the valve body in a sliding mode, and air holes are formed in the wall of the valve core. The flanging can guide the movement of the valve core, and the communication of the two sides of the valve core is realized through the air holes, so that the stable movement of the valve core is ensured, and the stable work of the pressure valve is realized.
Preferably, the closed end of the valve core is further provided with a support ring, the outer diameter of the support ring is larger than that of the valve core, and the support ring is arranged between the sealing gasket and the valve core. The support ring can play the effect of support to sealed the pad, guarantees sealed effectual, and after sealed pad damages, the support ring can with the sealing part cooperation, continues to accomplish the sealed of valve body, has improved the life of pressure valve.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
the wall-attached flame ultralow NO for the coking and hydrogenation devicexThe lower end of the outer gas pipe of the burner extends into the burner main body and is communicated with the inner gas pipe, the gas supplementing device can send tail gas in the combustion chamber into the outer gas pipe, the gas preheating effect in the outer gas pipe is guaranteed, the temperature difference between the inner gas pipe and the gas sprayed out of the outer gas pipe is small, the gas combustion is guaranteed to be more stable, and the whole oxygen concentration of the gas sprayed out of the outer gas pipe is lower during combustion to inhibit NOxIs generated.
Drawings
FIG. 1 shows ultra-low NO in wall-attached flame for coking and hydrogenation apparatusxA schematic front view cross-sectional view of a burner.
FIG. 2 shows ultralow NO content in wall-attached flame for coking and hydrogenation apparatusxSchematic left view of the burner.
FIG. 3 shows ultra-low NO in wall-attached flame for coking and hydrogenation apparatusxA schematic left-side cross-sectional view of a burner.
Fig. 4 is a schematic view of the connection between the outer gas pipe and the air supply pipe.
Fig. 5 is a front cross-sectional schematic view of a pressure valve.
Fig. 6 is a front cross-sectional schematic view of a docking head.
In the figure: 1. the gas burner comprises a cylinder body 2, an internal gas pipe 3, an internal gas pipe communicating pipe 4, an internal gas pipe inlet pipe 5, a wind adjusting butterfly valve 6, an external gas pipe 7, an external gas pipe communicating pipe 8, an external gas pipe inlet pipe 9, a pilot lamp 10, a wall 11, a burner 12, a combustion chamber 13, a gas supplementing pipe 14, an injector 15, a pressure valve 1501, a valve body 1502, a sealing part 1503, a valve core 1504, a gas vent 1505, a pressing ring 1506, a spring 1507, a supporting ring 1508, a sealing gasket 1509, a screw 16, a female head 1601, a sealing platform 17, a male head 1701, a supporting platform 18, a screw sleeve 19, a supporting ring 20, a gasket 21 and a Y-shaped sealing ring.
Detailed Description
Fig. 1 to 6 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 6.
Wall-attached flame ultralow NO for coking and hydrogenation devicexThe combustor, including the combustor main part, interior trachea 2, outer trachea 6 and accent wind butterfly valve 5, the top of combustor main part is provided with combustion chamber 12, combustion chamber 12 is attached to wall 10 and sets up, the lower extreme of interior trachea 2 stretches out the combustor main part setting, the upper end of interior trachea 2 extends in combustion chamber 12, outer trachea 6 sets up in the combustor main part outside, the lower extreme of outer trachea 6 stretches into in the combustor main part, and be linked together with interior trachea 2, outer trachea 6 still is connected with the tonifying qi device, the bottom intercommunication of tonifying qi device and combustion chamber 12, outer trachea 6 and interior trachea 2's upper end all is provided with nozzle 11. The wall-attached flame ultralow NO for the coking and hydrogenation devicexThe lower extreme of the outer gas pipe 6 of combustor stretches into in the combustor main part to be linked together with interior gas pipe 2, and air supplement unit can send into outer gas pipe 6 with the tail gas in the combustion chamber 12 in, it is effectual both to have guaranteed that the gas in the outer gas pipe 6 preheats, the temperature difference that makes interior gas pipe 2 and the gas of outer gas pipe 6 spun is little, it is more stable to guarantee the gas combustion, make the whole oxygen concentration of gas of outer gas pipe 6 spun when burning on the low side of inhibition NOxIs generated.
The present invention is further described with reference to specific embodiments, however, it will be understood by those skilled in the art that the detailed description given herein with respect to the drawings is for better explanation and that the present invention is necessarily to be construed as limited to those embodiments, and equivalents or common means thereof will not be described in detail but will fall within the scope of the present application.
Specifically, the method comprises the following steps: as shown in FIGS. 1 to 3: the combustor main part includes barrel 1 and the upper portion of lower part by combustion chamber 12 that the fire pan brick was built, and barrel 1 is the rectangular barrel of cross-section, and the bottom of barrel 1 seals the setting, and combustion chamber 12 sets up the upside at barrel 1, and combustion chamber 12 also is the rectangular barrel of cross-section, and the bottom of combustion chamber 12 and the top sealing connection of barrel 1. The right side of the combustion chamber 12 is disposed against the wall 10, and the right side of the combustion chamber 12 is connected to the wall 10. The lower portion of the combustion chamber 12 is vertically arranged, the upper portion is inclined from bottom to top and gradually approaches the wall 10, and the upper portion of the combustion chamber 12 is tapered from bottom to top, and the sectional area of the upper portion gradually decreases. The left side of the bottom of the cylinder 1 is connected with an air adjusting butterfly valve 5.
The top of the combustion chamber 12 is provided with a channel, the channel is arranged on one side of the combustion chamber 12 far away from the wall 10, the channel is in an inverted T shape, the end part of the vertical part of the channel is communicated with the top of the combustion chamber 12, and the two ends of the horizontal part of the channel are respectively communicated with the inner side and the outer side of the combustion chamber 12.
The pilot burner is characterized in that a pilot lamp 9 is arranged in the burner body, the pilot lamp 9 is vertically arranged, the lower end of the pilot lamp 9 extends downwards out of the burner body, and the upper end of the pilot lamp 9 extends into the combustion chamber 12.
The two inner gas pipes 2 are arranged on two sides of the pilot burner 9, the upper ends of the inner gas pipes 2 are provided with burner nozzles 11, the upper ends of the inner gas pipes 12 extend into the combustion chamber 12, and the lower ends of the inner gas pipes 12 extend downwards out of the burner main body. The lower extreme of two internal combustion trachea 2 all is linked together with internal combustion trachea communicating pipe 3, and internal combustion trachea communicating pipe 3 is connected with internal combustion trachea intake pipe 4, can carry the gas to inside gas pipe 2 through internal combustion trachea intake pipe 4.
The outer gas pipe 6 is arranged on one side of the burner body far away from the wall 10, the outer gas pipe 6 is arranged on the outer side of the combustion chamber 12, and the upper end of the outer gas pipe 6 is provided with a burner 11 and sprays gas to the upper side of the combustion chamber 12. Four outer gas pipes 6 are evenly distributed along the direction parallel to the wall 10 at intervals. The passages correspond to the outer gas pipes 6 one by one and are arranged opposite to the corresponding outer gas pipes 6.
Each outer gas pipe 6 is communicated with an outer gas pipe communicating pipe 7, each inner gas pipe 2 is communicated with the outer gas pipe communicating pipe 7 through an outer gas pipe intake pipe 8, one end of the outer gas pipe intake pipe 8 is communicated with the outer gas pipe communicating pipe 7, and the other end of the outer gas pipe intake pipe extends into the upper part of the barrel body 1 and is communicated with the corresponding inner gas pipe 2.
As shown in fig. 4: outer gas pipe 6 still is connected with air supplement unit, air supplement unit includes sprayer 14 and air supplement pipe 13, the high pressure medium entry of sprayer 14 is linked together with outer gas pipe 6's upper end, sprayer 14's low pressure medium entry is linked together with air supplement pipe 13's one end, air supplement pipe 13's the other end stretches into in the combustor main part to communicate with the bottom of combustion chamber 12, sprayer 14's medium exit linkage has nozzle 11, thereby can mix the tail gas of combustion chamber 12 bottom and the gas in the outer gas pipe 6, and spout through nozzle 11.
The air supply pipe 13 is provided with a pressure valve 15, the left end of the pressure valve 15 is an output end, the right end of the pressure valve 15 is an input end, the pressure at the left end of the pressure valve 15 is greater than the pressure at the right end, and when the pressure difference reaches a specified value, the pressure valve 15 is conducted.
As shown in fig. 5: the pressure valve 15 includes a valve body 1501, a valve core 1503, and a spring 1506, the valve body 15 is a cylinder with both ends open, a sealing portion 1502 is disposed on the inner side of the right end of the valve body 15, the sealing portion 1502 is a cone with an inner diameter gradually increasing along the direction of the air flow, and in this embodiment, the air flow flows along the direction from the right end to the left end of the valve body 1501. The valve core 1503 and the spring 1506 are arranged in the valve body 1501, the sealing portion 1502, the valve core 1503 and the spring 1506 are sequentially arranged along the direction of air flow, the left end of the spring 1506 is supported on the valve body 1501, the right end of the spring 1506 is connected with the valve core 1503 and pushes the valve core 1503 to press the sealing portion 1502 and seal the valve body 1501, and when the pressure difference between the right end and the left end of the valve body 1501 reaches a certain value, the valve core 1503 is pushed to move and the valve body 1501 is opened.
The valve core 1503 is a cylinder with a closed right end, the left end of the spring 1506 is supported on the valve body 1501, and the right end extends into the valve core 1503 and is supported on the closed end of the valve core 1503. The left end of encircleing case 1503 is provided with outside flanging, and the flanging is connected with valve body 1501 inner wall slidable, and the flanging cooperatees with the valve body 1501 inner wall and leads to the motion of case 1503, guarantees that case 1503 moves more steadily. The wall of the spool 1503 is provided with a plurality of air holes 1504, the air holes 1504 communicate the inner side and the outer side of the spool 1503, so that the right end and the left end of the spool 1503 are communicated, and gas can flow from the right side of the valve body 1501 to the left side of the valve body 1501 through the air holes 1504 in the spool 1503.
A support ring 1507, a sealing gasket 1508 and a pressing ring 1505 are sequentially arranged in the valve body 1501 on the right side of the valve core 1503 from left to right, a screw 1509 is coaxially arranged at the right end of the valve core 1503, the left end of the screw 1509 is connected with the closed end of the valve core 1503, and the right end penetrates through the support ring 1507, the sealing gasket 1508 and the pressing ring 1505 to be connected with a nut, so that the support ring 1507 and the sealing gasket 1508 are mounted. The outer diameter of the support ring 1507 is larger than the outer diameter of the spool 1503 and smaller than the inner diameter of the spool 1501, the outer diameter of the gasket 1508 is equal to the outer diameter of the support ring 1507, and the outer diameter of the pressure ring 1505 is smaller than the outer diameter of the spool 1503.
As shown in fig. 6: the internal combustion air pipe inlet pipe 4 is connected with a metal hose through a butt joint, and is connected with a fuel gas pipe through the metal hose, so that the input of fuel gas is realized.
The butt joint comprises a male joint 17, a female joint 16 and a threaded sleeve 18, the upper end of the female joint 16 is a female joint connecting portion, the outer wall of the female joint 16 is provided with threads, the inner diameter of the lower end of the female joint 16 is larger than that of the upper end, and a sealing platform 1601 is formed in the middle of the female joint 16. The lower part of the male head 17 is a male head connecting part, and a support table 1701 protruding outwards is arranged around the middle part of the male head 17. The lower end of the surrounding thread insert 18 is provided with an inward flange, the inward flange is arranged on the lower side of the supporting platform 1701, the male head 17 is in threaded connection with a supporting ring 19, and the supporting ring 19 is matched with the supporting platform 1701 to limit the inward flange of the thread insert 18. The lower part of the female head 16 extends into the threaded sleeve 18 and is in threaded connection with the threaded sleeve 18, so that the butt joint of the male head 17 and the female head 16 is realized.
A seal groove is provided on the outer side of the upper portion of the male head 17, a Y-shaped seal ring 21 is installed in the seal groove, and the Y-shaped seal ring 21 seals between the upper portion of the male head 17 and the lower portion of the female head 16. An annular gasket 20 is arranged between the upper end of the male head 17 and the sealing platform 1601, so that the upper end of the male head 17 and the sealing platform 1601 are sealed, secondary sealing is realized, and gas leakage is avoided.
Due to the guiding of the fire pan brick and the design of the gas jet hole angle and the fire pan brick jet surface angle during the combustion of the burner, the fuel gas and the air are mixed quickly and uniformly, regular flat wall-attached flames are formed during the combustion of the fuel, the flames are attached to the walls, the walls 10 of the two side walls are burned red, the fire walls become good heat radiating bodies, the heat transfer of the radiation chamber is more uniform, and the radiation heat transfer effect is improved.
At the same time, the flat dispersion flame effectively lowers the flame surface temperature, thereby suppressing N2And O2Combustion to form NOxThe high temperature area of the exhaust gas reduces NO in the exhaust gasxConcentration of NO in the flue gas during gas combustion in the burnerxThe average concentration is less than or equal to 20mg/Nm3. The technique of flat dispersion flame combustion with multiple fuel strands has high combustion efficiency and strong adaptability to fuel gas pressure and heat value fluctuation.
The combustor is in normal working condition, and the load regulation ratio is 1: within 5 (namely 25% -125% of normal heat load), the combustion is normal, the flame color is light yellow and is blue, the shape is flat wall-attached flame, the excess air coefficient is 1.15, the flame is rigid and forceful and does not drift, the maximum load flame is long: 1-1.5 m; normal load flame length: 1 to 1.2 m. The nozzle is free of coking within the design fuel and operating range.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (7)

1. Wall-attached flame ultralow NO for coking and hydrogenation devicexA burner, characterized by: including the combustor main part, interior trachea (2), outer trachea (6) and accent wind butterfly valve (5), the top of combustor main part is provided with combustion chamber (12), combustion chamber (12) are attached to wall (10) and set up, the lower extreme of interior trachea (2) stretches out the combustor main part and sets up, the upper end of interior trachea (2) extends in combustion chamber (12), outer trachea (6) set up in the combustor main part outside, the lower extreme of outer trachea (6) stretches into in the combustor main part, and be linked together with interior trachea (2), outer trachea (6) still are connected with the air supplement unit, the bottom intercommunication of air supplement unit and combustion chamber (12), the upper end of outer trachea (6) and interior trachea (2) all is provided with nozzle (11).
2. The wall-attached flame ultra-low NO for the coking and hydrogenation unit of claim 1xA burner, characterized by: the outer gas pipes (6) are arranged side by side along the wall (10), the lower ends of the outer gas pipes (6) are connected with outer gas pipe communicating pipes (7) to be communicated, and the outer gas pipe communicating pipes (7) are communicated with the inner gas pipes (2) through outer gas pipe air inlet pipes (8) extending into the combustor main body.
3. The wall-attached flame ultra-low NO for the coking and hydrogenation unit of claim 1xA burner, characterized by: the air supplementing device comprises an air supplementing pipe (13) and an ejector (14), a high-pressure medium inlet of the ejector (14) is communicated with the upper end of the outer gas pipe (6), a low-pressure medium inlet of the ejector (14) is communicated with the bottom of the combustion chamber (12) through the air supplementing pipe (13), and a medium outlet of the ejector (14) is communicated with the burner (11).
4. The wall-attached flame ultra-low NO for the coking and hydrogenation unit of claim 3xA burner, characterized by: the air supply pipe (13) is provided with a pressure valve (15), and the pressure at the output end of the pressure valve (15) is largeWhen the pressure at the input end and the pressure difference reach the designated value, the pressure valve (15) is conducted.
5. The wall-attached flame ultra-low NO for the coking and hydrogenation unit of claim 4xA burner, characterized by: the pressure valve (15) comprises a valve body (1501), a valve core (1503) and a spring (1506), wherein the valve body (1501) is a cylinder with two open ends, a conical sealing part (1502) with the diameter gradually reduced along the airflow direction is arranged in the valve body (1501), the valve core (1503) and the spring (1506) are both arranged in the valve body (1501), the spring (1506) is connected with the valve core (1503) and pushes the valve core (1503) to compress the sealing part (1502), and a sealing gasket (1508) is arranged at one end, close to the sealing part (1502), of the valve core (1503).
6. The wall-attached flame ultralow NO for the coking and hydrogenation device according to claim 5xA burner, characterized by: the valve core (1503) is a closed cylinder at one end close to the sealing part (1502), the outer diameter of the valve core (1503) is smaller than the inner diameter of the valve body (1501), a flanging is arranged at one end, far away from the sealing part (1502), surrounding the valve core (1503), and is in slidable connection with the inner wall of the valve body (1501), and air holes (1504) are formed in the wall of the valve core (1503).
7. The wall-attached flame ultralow NO for the coking and hydrogenation device according to claim 5xA burner, characterized by: the closed end of the valve core (1503) is also provided with a support ring (1507), the outer diameter of the support ring (1507) is larger than that of the valve core (1503), and the support ring (1507) is arranged between the sealing gasket (1508) and the valve core (1503).
CN202121166807.4U 2021-05-28 2021-05-28 Wall-attached flame ultralow NO for coking and hydrogenation devicexBurner with a burner head Active CN215112596U (en)

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CN202121166807.4U CN215112596U (en) 2021-05-28 2021-05-28 Wall-attached flame ultralow NO for coking and hydrogenation devicexBurner with a burner head

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Application Number Priority Date Filing Date Title
CN202121166807.4U CN215112596U (en) 2021-05-28 2021-05-28 Wall-attached flame ultralow NO for coking and hydrogenation devicexBurner with a burner head

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