JP5600634B2 - Combustion device - Google Patents

Description

  The present invention reduces HC (hydrocarbon), which is a source of odor when a combustion apparatus such as a petroleum fan heater is extinguished.

  Conventionally, in this type, a temperature detecting element is attached to the outer wall of the combustion cylinder of the catalytic combustion layer portion, and the combustion is stopped by detecting the backfire phenomenon in which a flame flows upstream from the catalytic combustion layer portion. This was to ensure safety. (See Patent Document 1.)

JP 58-64412 A

  By the way, in this prior art, even if the flashback phenomenon is detected and the combustion is stopped, there is a risk of burning inside the combustion cylinder, and how to prevent the flashback phenomenon is a big problem.

In order to solve the above-described problems, the present invention has a configuration in which, in particular, a bottomed cylindrical vaporization cylinder that includes a heater and premixes vaporized gas and combustion air, and premixed gas from the vaporized cylinder is provided on a peripheral wall. A burner head having a cylinder-shaped burner head to be burned by a plurality of flame holes provided, and an outer wall and an inner mesh of a wire mesh are respectively provided on the outer peripheral wall and the inner peripheral wall of the burner head. together provided in close contact to, the outer network by supporting a noble metal catalyst to perform the catalytic combustion, the internal network endothermic to backfire phenomenon heat of catalytic combustion increases the volume by thickening the wire diameter than the outer network It has been blocked .

  According to the present invention, the noble metal catalyst supported on the outer net of the burner head causes catalytic combustion in the outer net portion, and during stable combustion, the outer net becomes red hot and reaches 800 ° C. to 1000 ° C. When the combustion fan is driven, the unburned gas in the vaporization cylinder is pushed through the outer net that has been heated and red-heated sufficiently by the catalyst, so that it can be burned almost completely. It has been converted to CO2 and H2O, which reduces the odor to about 1/5 of the conventional one.

  In addition, for prevention of the flashback phenomenon of the flame, the amount of heat of the flame to be backfired is absorbed by the inner net with a thick wire diameter and increased volume, and further promotion of the flashback can be prevented. It is possible to prevent the risk of internal burning due to flashback into the vaporizing cylinder, and it can always be used with peace of mind.

The schematic block diagram of the combustion apparatus of one Embodiment of this invention. Sectional drawing of the principal part. The comparison figure of the hydrocarbon value of the combustion apparatus and the conventional combustion apparatus.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is a bottomed cylindrical vaporization cylinder, the heater 2 which consists of a sheathed heater is cast in an upper peripheral wall, and it is hold | maintained at 220-250 degreeC by the energization control by the temperature sensor 3 which consists of the thermistor provided in the lower part, The fuel oil supplied from the spray nozzle 4 placed on the lower peripheral wall opposite to the temperature sensor 3 is used as vaporized gas, and the combustion air supplied from the blower port 5 is premixed.

  6 is a cylinder-shaped burner head covered with the upper opening of the vaporizing cylinder 1, and has circumferentially arranged flame holes 7, 8, 9 on the peripheral wall, and upper and middle flame holes 7, 8 has a diameter of 6 to 7 mm, and the lower flame hole 9 has a slightly smaller diameter and a diameter of 5 to 5.5 mm, and 16 pieces are formed on the entire circumference, and the flame holes 7, 8, and 9 are formed. A wire net-like outer net 10 and an inner net 11 attached in close contact with the outer and inner surfaces of the peripheral wall are attached by spot welding.

  The outer net 10 is meshed with a wire diameter of 0.1 mm, in which a precious metal catalyst 12 such as platinum or palladium is supported, and the premixed gas ejected from each flame hole 7, 8, 9 of the burner head 6 The catalyst burns and becomes red hot, and the temperature rises to 800 ° C to 1000 ° C. Immediately after extinguishing the fire, the unburned gas comes into contact with this high-temperature catalyst and burns completely, almost converting it into CO2 and H2O, greatly increasing the odor. It is to reduce.

  Furthermore, the inner mesh 11 is meshed with a wire diameter of 0.3 mm, which is three times that of the outer mesh 10, and the volume is increased. During combustion, the premixed gas passes as a flame holding mesh. When the flashback phenomenon occurs, the inner net 10 with the increased volume absorbs the heat of the flame flowing back from the outer net 10 into the burner head 6 through the flame holes 7, 8, 9. In addition, the wire diameter is large and it is difficult to escape from the mesh, so that intrusion of flashback inward is prevented.

  13 is a burner head ring which is connected to the upper end of the vaporizing cylinder 1 at one end and is erected on the outer periphery of the burner head 6. Heating of vaporization heat to the cylinder 1 is performed.

  Reference numeral 14 denotes an ignition electrode provided on the outer periphery of the burner head 6 and ignited by discharge between the burner head 6. On the opposite side of the diagonal line, a flame rectifying action is used to set the ignition and combustion states as flame voltages. A frame rod 15 for detection is provided.

  Reference numeral 16 denotes a trumpet-shaped first collecting plate that divides the vaporizing cylinder 1 and the burner head 6. After the air-fuel mixture is once collected at a portion suspended in the vaporizing cylinder 1, the air-fuel mixture is once again between the second collecting plate 17. Aggregates after diffusion, promotes mixing by repeating diffusion and aggregation, and suppresses the flow rate of the air-fuel mixture. The first and second assembly plates 16 and 17 are previously joined and integrally molded It is.

  18 is a rectified cylindrical rectifying cylinder provided on the second collecting plate 17 and has a plurality of rectifying holes 19 on the upper side, and the flame holes of the burner head 6 while rectifying the inflowing air-fuel mixture. 7, 8 and 9.

Reference numeral 20 denotes a combustion fan composed of a turbo fan that supplies combustion air to the vaporizing cylinder 1, and supplies indoor air sucked from the suction port 21 from the blower port 5 through the blower passage 22.
Reference numeral 23 denotes an oil feed pipe for supplying fuel oil pumped by the electromagnetic pump 24 into the vaporizing cylinder 1, and a spray nozzle 4 protruding into the vaporizing cylinder 1 is provided at the tip thereof.

  Reference numeral 25 denotes a fixed tank to which the other end of the oil feeding pipe 23 is connected. The fixed tank 25 temporarily stores the fuel supplied from the cartridge-type oil supply tank 26 via the valve mechanism 27, and detects the amount of fuel and supplies the fuel below a predetermined amount. A float type oil supply detecting means 28 for informing and a filter cylinder 29 for preventing the inflow of dust into the oil feeding pipe 23 are provided.

  A rectifying network 30 is attached to the outer periphery of the rectifying cylinder 18 and extends upward. The rectifying network 30 adds final rectification to the air-fuel mixture discharged from the rectifying cylinder 18.

Next, the operation of the embodiment of the present invention will be described.
By performing a known operation, the heater 2 is energized to raise the temperature of the vaporizing cylinder 1 to a preset vaporizable temperature.
When the vaporizing cylinder 1 reaches a predetermined set temperature, the temperature sensor 3 detects this and activates the combustion fan 20, the electromagnetic pump 24, and the ignition electrode 14, respectively.

  As a result, the combustion fan 20 supplies the combustion air into the vaporizing cylinder 1 from the blower opening 5 through the air passage 22, and the fuel oil is vaporized from the spray nozzle 4 through the oil feed pipe 23 by driving the electromagnetic pump 24. The fuel oil is instantaneously vaporized in the vaporizing cylinder 1 and premixed with the combustion air to form a premixed gas.

  Then, the premixed gas passes through the first and second collecting plates 16 and 17 and flows into the upper rectifying cylinder 18 in a state where the flow velocity is suppressed while repeating collection and diffusion. The premixed gas is further sufficiently mixed and rectified through the rectifying hole 19, and then escapes through the inner net 11 having a large wire diameter with the help of a high air pressure, from each flame hole 7, 8, 9 of the burner head 6. The premixed gas is discharged toward the tight outer network 10 and ignited by the ignition electrode 14, so that the premixed gas is catalytically combusted by the noble metal catalyst 12 supported on the outer network 10 and is 800 ° C.˜ Maintain a high temperature of 1000 ° C.

  Next, at the time of fire extinguishing, the catalyst combustion is also extinguished, but the temperature does not drop immediately. Therefore, the unburned gas remaining in the vaporizing cylinder 1 which has been the cause of the odor so far is blown by the combustion fan 20 for cooling. When it is released from the flame holes 7, 8, and 9, it comes into contact with the precious metal catalyst 12 that has not fallen in temperature, so that it completely burns instantaneously and becomes CO2 and H2O, which does not cause odor. As can be seen from the comparison chart, the odor is reduced to 1/5 of the conventional one, and a fire extinguishing without odor can be obtained, so that it can always be used with peace of mind.

  Furthermore, in the catalytic combustion, if the combustion continues in the vicinity of the flame holes 7, 8, 9, there is a high possibility that a flashback phenomenon will occur, and even if a flashback phenomenon occurs, the flame holes 7, 8, The flame that has flowed into the burner head 6 through 9 has its heat absorbed by the inner net 11 whose wire diameter is larger than that of the outer net 10 and whose volume is increased, and further flashback is prevented. When the outer net 10 supports the noble metal catalyst 12 to reduce the odor during fire extinguishing, and the backfire newly generated by the noble metal catalyst 12 is increased by increasing the wire diameter of the inner net 11 and increasing the volume. It has been solved with an extremely simple configuration, and can always be used with confidence.

DESCRIPTION OF SYMBOLS 1 Vaporization cylinder 2 Heating heater 6 Burner head 7, 8, 9 Flame hole 10 Outer network 11 Inner network 12 Precious metal catalyst

Claims (1)

A bottomed cylindrical vaporization cylinder provided with a heater and premixing vaporized gas and combustion air, and a cylinder-shaped burner for burning the premixed gas from the vaporization cylinder in a plurality of flame holes provided on the peripheral wall in those with a head, the outer peripheral wall and inner peripheral wall of the burner head, each wire mesh-like outer network and internal network, with provided in close contact with the wall surface, thereby supporting the noble metal catalyst to external network The combustion apparatus is characterized in that the catalytic combustion is performed, the inner net has a larger wire diameter than the outer net, the volume is increased, and the amount of heat of catalytic combustion is absorbed to prevent the backfire phenomenon .

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