JP4964628B2 - Burner, primary air introduction method and combustion method - Google Patents

Description

  The present invention relates generally to a main burner used as a heating source such as a fryer, and more specifically to a pilot burner used as an ignition source (ignition source) for the main burner.

  A heating device such as a fryer used for frying food with oil is provided with an oil tank that contains and heats oil, and food put in the oil tank can be fried with heated oil. In order to heat the oil stored in the oil tank, such a fryer is usually mounted in the oil tank so that the combustion gas is burned as a heating source and the outer peripheral surface is immersed in the oil. It has a tubular shape that receives and passes the combustion gas burned by the inside, and has a dip tube that functions as a heat exchanger, and a pilot burner that always burns and functions as an ignition source for the main burner ing.

  In such a configuration, when the main burner is ignited using the flame supplied from the pilot burner, the supplied combustion gas is burned. This combustion gas is introduced into the dip tube from one end, passes through the inside, and is discharged from the other end to the outside of the dip tube. Thus, when the combustion gas passes through the inside of the dip tube, heat is transferred from the dip tube to the oil contacting the outer peripheral surface of the dip tube by a heat exchange action. In this way, the oil stored in the oil tank is heated by the dip tube.

  Since the combustion gas is supplied to the main burner while the temperature of the oil tank is lower than the set temperature, the main burner burns the supplied combustion gas, while the temperature of the oil tank is higher than the set temperature, Since the supply of the combustion gas to the main burner is stopped, the main burner stops the combustion of the combustion gas. On the other hand, since the pilot burner functions as an ignition source for the main burner, normally, the combustion gas is always burned when the heating apparatus is operated.

  The configuration of this pilot burner will be described with reference to FIG. FIG. 10A is a top view showing a configuration of a pilot burner according to the prior art, and FIG. 10B is a cross-sectional view of the pilot burner shown in FIG. As shown in FIGS. 10 (a) and 10 (b), the pilot burner 10 includes a cylindrical main body 3 having an opening 1 near one end and an open end 2 at the other end, A gas communication pipe 4 that conveys combustion gas, communicates with the gas communication pipe 4, and communicates with the main body 3 in the vicinity of the opening 1 through a jet port 5 having a smaller cross section than the gas communication pipe 4. It has a nozzle unit 6 and a spark unit 7 for igniting the combustion gas.

  In the above configuration, the combustion gas having a predetermined pressure conveyed by the gas communication pipe 4 is ejected from the ejection port 5 of the nozzle unit 6 into the main body unit 3. The combustion gas ejected into the main body 3 entrains primary air from the outside of the main body 3 through the opening 1 by its kinetic energy. As a result, a flow of primary air that moves from the outside of the main body 3 through the opening 1 to the inside of the main body 3 is generated. When the combustion gas supplied into the main body 3 and the primary air introduced into the main body 3 reach the open end 2 of the main body 3 in a mixed state, they are ignited and burned by the spark unit 7. . Thereafter, the combustion gas supplied into the main body 3 via the gas communication pipe 4 and the nozzle portion 6 continues to burn at the open end 2.

However, the conventional pilot burner used as an ignition source in the conventional heating apparatus has the following problems.
That is, it is not only primary air that is introduced from the opening 1 of the main body 3 by the kinetic energy of the combustion gas ejected into the main body 3, but also contamination such as oil smoke drifting around the pilot burner 10. Substances are also included. In other words, contaminants such as oily smoke drifting around the main body 3 are entrained by the primary air generated by the kinetic energy of the combustion gas, and move through the opening 1 into the main body 3. Thereby, contaminants adhere to the vicinity of the opening 1. Furthermore, some of the contaminants that have moved from the opening 1 to the inside of the main body 3 move in the direction opposite to the direction in which the combustion gas travels, that is, in the direction toward the nozzle 6. It also adheres to the inside. As a result, as time elapses, a large amount of contaminants mainly adhere to the vicinity of the opening 1 and the inside of the nozzle portion 6. Such adhesion of contaminants proceeds not only when the pilot burner is operating but also when the pilot burner is not operating.

  If a large amount of contaminants adheres to the vicinity of the opening 1, the amount of primary air passing through the opening 1 is reduced, and a sufficient amount of primary air is not supplied to the open end 2 of the main body 3. On the other hand, when a large amount of contaminants adheres to the inside of the nozzle portion 6, a sufficient amount of combustion gas is not supplied to the open end 2 of the main body portion 3. Therefore, the pilot burner that has become clogged with contaminants cannot exhibit its original performance unless the adhered contaminants are removed.

  However, it is not easy and safe for a pilot burner user (ie, a user of a heating device to which the pilot burner is attached) to disassemble the pilot burner to remove contaminants attached to the opening or nozzle. From the viewpoints of reproducibility and reproducibility, it is not desirable. Therefore, the user must request a technician who belongs to the company that supplies the pilot burner to remove the contaminant. Therefore, the pilot burner according to the prior art requires maintenance and other costs and labor for removing contaminants.

  In order to solve such a problem, a method is conceivable in which the pilot burner is attached to a heating device and operated while the periphery (for example, three or four sides) of the pilot burner is surrounded by a plate or the like. However, when this method is used, a space for attaching a plate or the like in the heating apparatus is required separately, and additional cost is required for the plate or the like.

  The problems described above are not limited to the pilot burner, but are commonly applied to a general burner having an opening for taking in primary air.

  The present invention has been made in view of such problems, a burner capable of preventing performance deterioration due to adhesion of pollutants while suppressing necessary cost, labor and space, a primary air introduction method, And it aims at providing the combustion method.

  A burner according to one aspect of the present invention is a burner that introduces primary air and burns combustion gas, and is in communication with a cylindrical main body provided with an opening and a pipe that conveys fuel gas. The fuel gas is jetted into the main body through a jet having a smaller cross section than the pipe and communicating with the inside of the main body in the vicinity of the opening. By setting the negative pressure state, a nozzle part adapted to generate a flow of primary air that moves from the outside of the main body part to the inside of the main body part through the opening, and the inside of the main body part And a mesh member provided at a position facing the opening of the main body so as to reduce pollutants entrained by the moving primary air.

  According to another aspect of the present invention, there is provided a primary air introduction method comprising: a cylindrical main body provided with an opening; a pipe that communicates combustion gas; and a jet outlet having a smaller cross section than the pipe. A primary air introduction method for introducing primary air into a burner comprising: a nozzle portion communicating with the inside of the main body portion in the vicinity of the opening portion; and a net-like member provided at a position facing the opening portion. Then, the combustion gas conveyed by the pipe is ejected into the main body through the nozzle outlet and the inside of the main body is brought into a negative pressure state. A step of generating a flow of primary air moving from the outside through the opening to the inside of the main body, and introducing primary air moving from the outside of the main body toward the opening through the mesh member Thus, the main body portion Characterized in that it comprises the steps of reducing contaminants entrained in the primary air moves to the inside, the.

  According to another aspect of the present invention, there is provided a combustion method comprising a cylindrical main body having an opening and having an open end, and a jet port communicating with a pipe carrying combustion gas and having a smaller cross section than the pipe. A combustion method in which the combustion gas is burned by a burner comprising: a nozzle portion that communicates with the inside of the main body portion in the vicinity of the opening portion, and a mesh member provided at a position facing the opening portion. Then, the combustion gas conveyed by the pipe is ejected into the main body through the nozzle outlet and the inside of the main body is brought into a negative pressure state. A step of generating a flow of primary air moving from the outside through the opening to the inside of the main body, and introducing primary air moving from the outside of the main body toward the opening through the mesh member And this A step of reducing pollutants entrained in the primary air moving to the inside of the body part, the combustion gas jetted into the body part through the nozzle outlet of the nozzle part, and the inside of the body part from the opening And discharging the primary air moved to the outside from the open end and burning the primary air.

  According to the present invention, the flow rate of the primary air moving from the outside of the pilot burner to the inside of the pilot through the opening is reduced at a position facing the opening for taking in the primary air, and is entrained by the primary air. By providing a mesh member that acts as a filter for the pollutants, a burner that can prevent degradation in performance due to the adhesion of pollutants while suppressing necessary cost, labor and space, a primary air introduction method, and A combustion method can be provided.

Hereinafter, the case where this invention is applied to the pilot burner provided in a heating apparatus is demonstrated as an example.
(One embodiment)
First, an overall configuration of a fryer using the pilot burner according to the present invention as an ignition source for the main burner will be described with reference to FIG.

FIG. 1 is a side view showing a main internal structure of a fryer using a pilot burner according to the present invention. FIG. 2 is a perspective view of the flyer shown in FIG.
The flyer 100 is configured by a casing 101 having a box shape as a whole. An oil tank 103 for storing oil 102 for frying food is provided on the upper portion of the casing 101. Inside the oil tank 103, a dip tube 104 for heating the oil 102 accommodated in the oil tank 103 is provided. Various devices relating to heating of the dip tube 104 are accommodated in the housing unit 101.

  Specifically, as shown in FIG. 1, a pipe 105 that mainly conveys combustion gas supplied from the outside of the flyer 100 and a combustion carried by the pipe 105 are provided inside the casing unit 101. A gas control unit 107 that has a knob 106 that receives gas and is used for operation by an operator, and that is responsible for electrical and mechanical control of the combustion gas conveyed by the pipe 105, and combustion gas by the gas control unit 107. The main burner which functions as a heating source for the immersion tube 104 by controlling the supply of combustion gas and the like by the gas control unit 107 and the pilot burner 108 according to the present embodiment in which the supply of gas is controlled and functions as an ignition source 109 and the combustion chamber in which combustion is performed by the main burner 109 and the burned combustion gas is guided to the dip tube 104 10, an exhaust pipe 111 is a passage for exhausting the combustion gas passing through the Hitakan 104 outside of the fryer 100, is housed.

  In the flyer 100 having the above configuration, when a predetermined operation is performed on the knob 106 and a power-on operation is instructed to the flyer 100, the pilot burner is ignited under the control of the gas control unit 107. That is, the combustion gas conveyed by the pipe 105 is supplied to the pilot burner 108 under the control of the gas control unit 107. The pilot burner 108 burns the supplied combustion gas.

  In a state where the combustion by the pilot burner 108 is being performed, when a predetermined operation is performed on the knob 106 and an ignition operation for the main burner 109 is instructed, the ignition to the main burner 109 is executed by the control of the gas control unit 107. Is done. That is, the combustion gas conveyed by the pipe 105 is supplied to the main burner 109 under the control of the gas control unit 107. The main burner 109 burns the supplied combustion gas in the combustion chamber 110 using the flame generated by the pilot burner 108 as an ignition source.

  Combustion gas burned in the combustion chamber is introduced into one end of the dip tube 104 and moves through the dip tube 104. At this time, the temperature of the combustion gas is transmitted to the oil 102 immersing the outer peripheral surface of the dip tube 104 by the heat exchange action of the dip tube 104. The combustion gas that has moved inside the dip tube 104 is discharged from the other end of the dip tube 104, passes through the inside of the exhaust tube 111, and is discharged to the outside of the flyer 100.

  In this state where combustion by the main burner 109 is being performed, when the temperature of the oil 102 stored in the oil tank 103 reaches a set temperature, the gas control unit 107 controls the combustion gas to the main burner 109. When the supply is stopped, the main burner 109 stops combustion.

  When combustion of the main burner 109 stops and the temperature of the oil 102 stored in the oil tank 103 falls below the set temperature, the main burner 109 is ignited again under the control of the gas control unit 107.

  Next, the internal configuration of pilot burner 108 according to the present embodiment will be further described with reference to FIGS. FIG. 3A is a top view showing the configuration of the pilot burner according to the present embodiment, and FIG. 3B is a cross-sectional view of the pilot burner shown in FIG. FIG. 4 is a perspective view of the pilot burner shown in FIG. 3 as viewed from the upper right front.

  As shown in FIGS. 3 (a) and 3 (b), the pilot burner 108 includes a cylindrical main body 303 having an opening 301 near one end and an open end 302 at the other end, A gas communication pipe 304 that conveys combustion gas, communicates with the gas communication pipe 304, and communicates with the main body section 303 in the vicinity of the opening 301 via a jet port 305 having a smaller cross section than the gas communication pipe 304. A nozzle unit 306, a mesh member 307 provided so as to cover the opening 301, a spark unit 308 for igniting the combustion gas, and a thermocouple (thermocouple) 309 as a turning-off safety device are provided.

  In the present embodiment, the mesh member 307 is made of, for example, a stainless mesh. In particular, it is desirable to use a stainless steel mesh having a wire diameter of 0.7φ and an opening (distance between the wires) of 1 mm or less. Although the effect is obtained by covering the opening 301 with at least one stainless steel mesh, the stainless steel mesh may be wound around the main body 303 a plurality of times from the viewpoint of stability after attachment. About the proximity degree between the opening part 301 and the mesh member 307, about 0-10 mm is desirable for the distance between both.

  In the pilot burner having the above configuration, the cross section of the jet outlet 305 of the nozzle portion 306 is smaller than the cross section of the gas communication pipe 304. Therefore, when the combustion gas having a predetermined pressure conveyed by the gas communication pipe 304 passes through the ejection port 305 and moves into the main body 303, the pressure of the combustion gas becomes small. Therefore, the pressure inside the main body 303 (particularly near the opening 301) is smaller than the pressure outside the main body 303. That is, the inside of the main body 303 is in a negative pressure state. Due to the negative pressure inside the main body 303, a flow of primary air that moves from the outside of the main body 303 through the opening 301 toward the inside of the main body 303 is generated. In other words, the combustion gas ejected into the main body 303 entrains primary air from the outside of the main body 303 through the opening 301 by its kinetic energy.

  Here, as described above, the mesh member 307 is provided so as to cover the opening 301, that is, at a position facing the opening 301. First, the mesh member 307 acts as a resistance to the primary air flow generated as described above. Therefore, when the primary air moving from the outside of the main body 303 toward the opening 301 passes through the mesh member 307, the flow velocity thereof is reduced. Therefore, the amount of contaminants (contaminants drifting outside the main body 303) entrained by the primary air moving toward the opening 301 passes through the mesh member 307 per unit time is reduced. Therefore, the amount of contaminants that enter the main body 303 is reduced. Therefore, it is possible to greatly suppress the contamination from adhering to the inside of the main body portion 303, for example, the opening portion 301 and the nozzle portion 305.

  Second, the mesh member 307 acts as a filter against contaminants entrained by the primary air moving toward the opening 301. That is, at least a part of the contaminants entrained by the primary air moving toward the opening 301 collides with the mesh member 307 and is returned to the outside of the main body 303 or attached to the mesh member 307 as it is. Therefore, it cannot move to the inside of the main body 303. Therefore, also by this filter action, as a result, the amount of contaminants (contaminants drifting outside the main body 303) passing through the mesh member 307 per unit time is reduced. Therefore, it is possible to greatly suppress the contamination from adhering to the inside of the main body portion 303, for example, the opening portion 301 and the nozzle portion 305. It is clear that the function as a filter functions differently when the pilot burner 108 is in operation as well as when the pilot burner 108 is in operation.

  The primary air introduced through the mesh member 307 moves inside the main body 3 toward the open end 302 while being mixed with the fuel gas ejected from the ejection port 305. The fuel gas and primary air that have reached the open end 302 are discharged to the outside of the main body 303, and are ignited and burned by the spark unit 308 controlled by the gas control unit 107 (see FIG. 1).

  When the pilot burner 108 is in operation, if the combustion gas is released from the open end 302 but no combustion is performed, a thermocouple 309 that detects the temperature near the open end 302 is detected. However, by transmitting the temperature to the gas control unit 107, the gas control unit 107 stops supplying the combustion gas to the pilot burner 108 via the gas communication pipe 304.

  As described above, according to the present embodiment, the mesh member provided at a position facing the opening that takes in primary air moves from the outside of the main body through the opening to the inside of the main body. Reduce the air flow rate. Thus, the amount of contaminants entrained by the primary air moving toward the opening through the mesh member per unit time decreases. Furthermore, the mesh member acts as a filter for the contaminant entrained by the primary air moving toward the opening, and returns the contaminant entrained by the primary air to the outside of the main body or the mesh member. Adhere to. This also reduces the amount of contaminants entrained by the primary air moving towards the opening through the mesh member per unit time. In addition, the filter action of the mesh member reduces the amount of contaminants that enter the interior of the main body through the opening and the amount of contaminants that adhere to the opening.

  In addition, when the performance of the pilot burner is deteriorated due to contamination of the mesh member by the contaminant, the pilot burner can be replaced by replacing the mesh member with a new one without adjusting the pilot burner itself. Performance can be demonstrated. Furthermore, no special space is required to provide the mesh member on the pilot burner. Therefore, it is possible to prevent the performance of the pilot burner from being deteriorated due to the adherence of contaminants while suppressing the necessary cost, labor and space.

Next, effects obtained by the pilot burner according to the present embodiment will be described based on experimental results.
In the experiment, a pilot burner (type 1) housed in a box-shaped housing with only the top surface opened, a pilot burner (type 2) housed in a box-shaped housing with the top surface and one side surface opened, The pilot burner (type 3) and four types of pilot burners according to the present embodiment were used according to the following procedure.

(1) The above four types of pilot burners are installed at a position 60 mm above the oil level in the fryer oil tank, and these pilot burners are ignited.
(2) The main burner is ignited and the temperature of the oil in the oil tank is set to 200 ° C.
(3) The temperature of the oil in the oil tank is kept at 200 ° C. to always generate oil smoke.
(4) In order to trap the generated oil smoke, a lid is provided on the oil tank in a state where four types of pilot lamps are accommodated in the oil tank (however, an opening of 70 mm is provided for intake and exhaust). In this state, the four types of pilot burners continue the combustion operation.
(5) After about 350 hours have elapsed, the four types of pilot burners are changed to a combustion state and a non-combustion state every 4 hours. However, the combustion of the main burner is continued.
(6) The experiment is terminated about 1000 hours after (1).

As a result of such an experiment, with respect to the type 3 pilot burner, at about 670 hours after the start of the experiment, the nozzle portion was clogged with contaminants (oil smoke), and as a result, the generated flame was red-fired. For type 1, 2 and 4 pilot burners, no smoke was clogged in the nozzle part.
Regarding the type 1 and 2 pilot burners, the nozzle portion was not clogged with contaminants. However, as a result of the contamination in the casing housing these, a large amount of contaminants adhered to the pilot burner body itself. On the other hand, in the case of the type 4 pilot burner, no contaminants adhered to the main body itself.

  As described above, the pilot burner according to the present embodiment has a remarkable effect as compared with the pilot burner according to the related art in terms of prevention of contamination, and is equivalent to the pilot burner accommodated in the box-shaped housing. It is clear that the above performance is exhibited. Furthermore, the pilot burner according to the present embodiment is superior to the pilot burner housed in a box-shaped housing from the viewpoint of space saving and maintainability when replacing the pilot burner.

(Another embodiment)
In the present embodiment, another method for attaching the mesh member to the pilot burner will be described.

FIG. 5 (a) is a top view showing a pilot burner according to another embodiment of the present invention, and FIG. 5 (b) is a side view of the pilot burner shown in FIG. 5 (a) as seen from the right side. is there.
As shown in FIGS. 5 (a) and 5 (b), a single mesh member or a mesh member 500 folded several times is mounted on the upper surface of the pilot burner so as to face substantially the entire opening and main body. In the placed state, it is fixed to the pilot burner by screws 501 or the like 501.

6 (a) is a top view showing a pilot burner according to still another embodiment of the present invention, and FIG. 6 (b) is a side view of the pilot burner shown in FIG. 6 (a) as viewed from the right side. It is.
As shown in FIGS. 6 (a) and 6 (b), a single mesh member or a mesh member 600 folded several times is mounted on the upper surface of the pilot burner so as to face substantially the entire opening and main body. In the placed state, the spot 601 is fixed to the pilot burner.

FIG. 7A is a top view showing a pilot burner according to still another embodiment of the present invention, and FIG. 7B is a side view of the pilot burner shown in FIG. 7A viewed from the right side. It is.
As shown in FIG. 7A and FIG. 7B, a single mesh member or a mesh member 700 folded several times so as to cover the entire opening 301 faces the opening 301. In the state of being placed on the upper surface of the pilot burner, it is fixed to the pilot burner by welding.

FIG. 8A is a top view showing a pilot burner according to still another embodiment of the present invention, and FIG. 8B is a side view of the pilot burner shown in FIG. 8A viewed from the right side. It is.
As shown in FIGS. 8 (a) and 8 (b), a single mesh member or a mesh member 800 folded several times has a size enough to cover substantially the entire opening and main body, A mesh member 800 provided with a hooking portion 801 having an L-shaped cross section is prepared. The mesh member 800 is mounted on the upper surface of the pilot burner so as to face the opening 301, and is attached to the pilot burner so that the hooking portion 801 contacts the bottom surface and at least one side surface of the pilot burner. . The hooking portion 801 prevents the mesh member 800 from being detached from the pilot burner.

FIG. 9A is a top view showing a pilot burner according to still another embodiment of the present invention, and FIG. 9B is a side view of the pilot burner shown in FIG. 9A viewed from the right side. It is.
As shown in FIGS. 9 (a) and 9 (b), there is a single mesh member or a mesh member 900 that is folded several times and has a size sufficient to cover substantially the entire opening and body. A mesh member 900 having a U-shaped cross-sectional shape is prepared. The mesh member 900 is attached in a state of being inserted into the pilot burner so that the inner surface is in contact with the upper surface, the lower surface, and one side surface including the opening 301 of the pilot burner.

  Although the present invention has been described above by taking the pilot burner as an example, the present invention is not limited to the pilot burner, and is similarly applied to a general burner that introduces primary air and burns combustion gas. It is possible to do.

FIG. 1 is a side view showing a main internal structure of a fryer using a pilot burner according to the present invention. FIG. 2 is a perspective view of the flyer shown in FIG. FIG. 3A is a top view showing the configuration of the pilot burner according to the present embodiment. FIG. 3B is a cross-sectional view of the pilot burner shown in FIG. FIG. 4 is a perspective view of the pilot burner shown in FIG. 3 as viewed from the upper right front. FIG. 5A is a top view showing a pilot burner according to another embodiment of the present invention. FIG.5 (b) is the side view which looked at the pilot burner shown to Fig.5 (a) from the right side surface. FIG. 6A is a top view showing a pilot burner according to still another embodiment of the present invention. FIG. 6B is a side view of the pilot burner shown in FIG. FIG. 7A is a top view showing a pilot burner according to still another embodiment of the present invention. FIG.7 (b) is the side view which looked at the pilot burner shown to Fig.7 (a) from the right side surface. FIG. 8A is a top view showing a pilot burner according to still another embodiment of the present invention. FIG. 8B is a side view of the pilot burner shown in FIG. FIG. 9A is a top view showing a pilot burner according to still another embodiment of the present invention. FIG.9 (b) is the side view which looked at the pilot burner shown to Fig.9 (a) from the right side surface. Fig.10 (a) is a top view which shows the structure of the pilot burner based on a prior art. FIG.10 (b) is sectional drawing seen from the A cross section of the pilot burner shown to Fig.10 (a).

Explanation of symbols

108 Pilot Burner 301 Opening 302 Open End 303 Main Body 304 Gas Communication Pipe 305 Jetting Port 306 Nozzle 307, 500, 600, 700, 800, 900 Net Member 501 Screw 601 Spot 801 Hook

Claims (3)

A pilot burner that serves as an ignition source for a main burner disposed below the oil tank to heat the oil contained in the oil tank,
A main body provided with an opening for introducing primary air ;
A temperature detector that detects the temperature near the open end of the main body of the pilot burner adjacent to the main body;
The fuel gas is jetted into the main body through a jet port that communicates with a pipe that conveys the fuel gas and has a smaller cross section than the pipe and communicates with the inside of the main body near the opening. Letting the inside of the main body part be in a negative pressure state, thereby generating a flow of primary air that moves from the outside of the main body part through the opening to the inside of the main body part, and
A net-like member provided by folding one or more sheets so as to integrally cover the upper surface of the main body including the opening and the upper surface of the temperature detector ;
A pilot burner comprising: The mesh member is composed of a net-like member upper surface to integrally each upper surface of the main body portion and the temperature detector, and a side surface adjacent to the mesh member upper surface, a lower surface adjacent to the side surface, one of said mesh member The size of the upper surface of the mesh member is made equal to the size of the lower surface so that the cross-sectional shape becomes a U-shape, and the lower surface and the side surface abut on the lower surface and the side surface of the main body part or the temperature detector. Pilot burner described in 1. The mesh member includes a mesh member upper surface in which the upper surfaces of the main body and the temperature detector are integrated, a side surface adjacent to the mesh member upper surface, and a lower surface adjacent to the side surface. The size of the lower surface is smaller than the size of the upper surface of the mesh member so that the cross-sectional shape is L-shaped, and the lower surface and the side surface are in contact with the lower surface and the side surface of the main body part or the temperature detector. The pilot burner according to 1.

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