JP2858669B2 - Oil burning equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gasification type oil burning device.

2. Description of the Related Art As shown in FIG.
Has a built-in heater 2 at the bottom and a vaporization chamber 4 partitioned by a vaporization cylinder lid 3. The heat receiving section 5 is ring-shaped,
It had been extended from the vaporization cylinder 1. Vaporization cylinder inlet 6 is vaporization chamber 4
Open in the connection direction on the peripheral surface of the oil pump and face the oil feed nozzle 7 connected to an oil pump (not shown). The burner head 8 includes a flame port plate 9, a flame port net 10, and a flame cap 11, and is provided on the vaporization cylinder lid 3. It contained an air chamber 12 and a vaporizing cylinder 1 and was connected to a combustion fan 13. The secondary air port 14 was open at the top of the air chamber 12.

The preheating operation in the above configuration will be described. When the heater 2 is energized, the vaporizing cylinder 1 and the burner head 8 are preheated. When the temperature of the peripheral surface of the vaporizing chamber 4 rises to a set temperature, the heater 2 is turned on and off at this temperature to set the temperature of the vaporizing cylinder 1. Was kept at the temperature. Next, the combustion operation will be described. The air sent from the combustion fan 13 flows into the vaporization chamber 4 from the vaporization cylinder inlet 6 and is divided into two systems: vaporized air forming a swirling flow and secondary air ejected from the secondary air port 14. . In addition, the kerosene collides with the inner peripheral surface of the vaporization chamber 4 and is vaporized. Further, the kerosene that could not be vaporized was completely vaporized while flowing on the bottom surface of the vaporization cylinder 1. Then, the generated vaporized gas is mixed with the previous vaporized air to become a premixed gas, which has been jetted from the flame port plate 9. This premixed gas started burning by the discharge of an ignition electrode (not shown) in the gap between the heat receiving section 5 and the burner head 8, and the combustion was promoted by the secondary air to form a uniform flame. When the combustion heat received by the heat receiving section 5 is conducted to the vaporization cylinder 1, the heater 2 is turned on and off, and the inner peripheral surface of the vaporization chamber 4 is maintained at the set temperature.

However, in the above configuration, the burner head 8 is preheated by the heater 2 through the bottom of the vaporization cylinder 1, the inner peripheral surface of the vaporization chamber 4, and the vaporization cylinder lid 3 in the preheating operation. . Therefore, as shown in the temperature change during the preheating operation in FIG. 6 (the horizontal axis represents the elapsed time, and the vertical axis represents the temperature of each part).
Has a problem that the temperature rise is much slower than the inner peripheral surface of the vaporization chamber 4. Specifically, when the ignition operation is started immediately after the preheating of the vaporization chamber 4 is completed, the burner head 8
Since the temperature is still lower than the ignition good temperature (region where vaporized gas is condensed), the amount of vaporized gas condensed on the burner head 8 lowers the fuel concentration to fall outside the flammable range, resulting in poor ignition. If the burner head 8 was digested before the temperature rose even if it was ignited, white smoke and odor were generated from the condensed kerosene attached to the burner head 8.

On the other hand, in the combustion operation, the vaporized air forming the swirling flow promotes the vaporization of the kerosene and the mixing action with the vaporized gas. There has been a problem that the fuel becomes stable and the sound of combustion becomes loud.

In particular, in the case of the deteriorated kerosene, the vaporized cylinder 1 is formed by the swirling vaporized gas of the deteriorated kerosene that cannot be completely vaporized on the inner peripheral surface of the vaporization chamber 4.
Is collected at the center of the bottom surface of the vaporization cylinder, and therefore, the contact area between the bottom surface of the vaporization cylinder 1 and the altered kerosene is reduced, and the bottom surface of the vaporization cylinder 1 is maintained at a higher temperature than the inner peripheral surface of the vaporization chamber 4 by the heater 2. The heat transfer was poor despite the presence. As a result, the deteriorated kerosene is not instantaneously vaporized, but is vaporized while being thermally decomposed, so that there is a problem that tar is generated on the bottom surface of the vaporization cylinder 1.

The present invention has been made to solve the conventional problems, and has as its object to prevent ignition failure, suppress combustion noise, and suppress tar.

Means for Solving the Problems In order to solve the above problems, the oil combustion device of the present invention is:
A burner head provided at the upper part of the bottomed box-shaped uniform chamber, a vaporizing chamber, a mixing passage formed at the lower part of the vaporizing chamber, a vaporizing part provided by projecting the vaporizing chamber above the burner head, and a vaporizing chamber. A communicating combustion fan, a plurality of preheating fins projecting from the inner wall of the mixing passage and inclined in the flow direction, and a combustion fan controller for operating the combustion fan at a low speed when the vaporization chamber is at or below the preheating judgment temperature during preheating. It is provided with.

Effect of the Invention With the above configuration, the combustion fan controller operates the combustion fan at a low speed when the vaporization chamber is at or below the preheating determination temperature during preheating. Then, the temperature of the vaporizing chamber, the mixing passage, and the preheating fins is increased by the heater. On the other hand, the air blown by the combustion fan flows into the vaporization chamber from the vaporization chamber entrance and exchanges heat with each inner peripheral surface while passing through the vaporization section and the mixing passage without forming stagnation, and in particular, passes through the gap between the preheating fins. When the temperature rises. Subsequently, the temperature rises and the air heats the burner head, so that the burner head also rises in temperature. As a result, when the ignition operation is started immediately after the preheating of the vaporization chamber is completed, the burner head is at a temperature higher than the good ignition temperature (a region where vaporized gas is hardly dewed), so that the fuel concentration of the burner head is stable and the ignition is good. . Also, even if digested immediately after ignition, no white smoke or odor is generated.

On the other hand, the vaporized gas and air generated in the vaporization chamber are mixed to form a premixed gas, which is rectified when passing through the gap between the preheating fins. Since the rectified premixed gas burns, the flame is stabilized and the combustion noise is reduced.

In addition, when the kerosene is the altered kerosene, the altered kerosene that cannot be completely vaporized in the vaporization chamber flows down into the mixing passage, collides with the preheating fins, is disturbed to improve the heat transfer coefficient, and spreads the surface of the preheating fins. As a result, the altered kerosene can be vaporized, so that the production of tar can be suppressed.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 5, reference numeral 15 denotes a box-shaped uniform chamber with a bottom.
A vaporization chamber 18 having a burner head 16 and a mixing passage 17 formed in the upper part.
Is provided. Reference numeral 19 denotes a vaporizer having a planar shape, which in this embodiment is provided, for example, inclined upward so as to protrude above the burner head 16, and is hereinafter referred to as an inclined vaporizer. A communication port 20 communicates the upper part of the vaporization chamber 18 with the mixing passage 17. twenty one
Is a bottom vaporizing surface formed below the inclined vaporizing section 19. twenty two
Is a heat receiving portion provided on the back surface of the inclined vaporizing portion 19, and is formed from heat receiving fins. A plurality of preheating fins 23 projecting from the mixing passage 17 are inclined from the communication port 20 toward the uniform chamber 15. Reference numeral 24 denotes a heater which is incorporated in the inclined vaporizing section 19. Reference numeral 25 denotes a vaporization chamber entrance, which is open to the vaporization chamber lid 26 so as to face the lower part of the inclined vaporization section 19. Numeral 27 denotes an oil feed nozzle entrance, which is opened to the vaporization chamber lid 26 so as to face the upper part of the inclined vaporizer 19, and an oil feed nozzle 28 faces. Reference numeral 29 denotes a combustion fan, which communicates with the vaporization chamber 18 and the burner head 16. Reference numeral 30 denotes a vaporization chamber temperature detection device, which detects the temperature of the vaporization chamber 18 with a thermistor 31. A combustion fan controller 32 operates the combustion fan 29 at a low speed during a preheating operation in which the temperature of the vaporization chamber 18 is equal to or lower than the preheating determination temperature by the vaporization chamber temperature detection device 30. Reference numeral 33 denotes a heater controller which turns on and off the heater by a relay or the like. 34 is a load other than the heater 24 and the combustion fan 29. An air chamber 35 is communicated with the combustion fan 29.

Next, the preheating operation in this configuration will be described. When the temperature of the vaporization chamber 18 detected by the vaporization chamber temperature detection device 30 is equal to or lower than the preheating determination temperature, the heater 24 is energized by the heater controller 33, and the combustion fan 29 is operated at a low speed by the combustion fan controller 32. Start. Then, as shown in the temperature change at the time of the preheating operation in FIG. 6, the temperature of the vaporizing chamber 18, the mixing passage 17 and the preheating fins 23 are increased by the heater 24. On the other hand, the low-speed air blown by the combustion fan 29 flows into the vaporization chamber 18 from the vaporization chamber inlet 25 and exchanges heat with each inner peripheral surface while passing through the inclined vaporization section 19 and the mixing passage 17 without stagnation, In particular, the temperature rises when passing through the gap between the preheating fins 23. Subsequently, the temperature-raised air heats the uniform chamber 15 and the burner head 16, so that the burner head 16 also rises in temperature. As a result, even if the ignition operation is started immediately after the preheating of the vaporization chamber 18 is completed, the burner head 16 is at a temperature higher than the ignition favorable temperature (a region where vaporized gas is hardly dewed). The fuel concentration is stable without dew condensation at the burner head 16, and ignition is good. In addition, even if it is digested immediately after ignition, there is no kerosene condensed on the burner head 16, so that no white smoke or odor is generated. Even if the dew is slightly condensed on the burner head 16, there is no practical problem since the burner head 16 is heated by the radiation of the flame and the temperature rises rapidly, and the condensed kerosene vaporizes again. Further, since the speed of the air from the combustion fan 29 is low, the vaporizing section 19 is not significantly cooled, and the temperature rise of the vaporizing section is not significantly reduced. When the temperature of the vaporization chamber 18 detected by the vaporization chamber temperature detection device 30 becomes equal to or higher than the set temperature, the power supply to the heater 24 is stopped by the heater controller 33 and the combustion fan 29
Is stopped by the combustion fan controller 32. Thereafter, the heater 24 is turned on and off by the heater controller 33, and the vaporization chamber 18 is maintained at the set temperature.

On the other hand, in the combustion operation, the vaporized air promotes the vaporization of the kerosene and promotes the mixing action with the vaporized gas, but on the contrary, it generates a large turbulence in the premixed gas. However, the premixed gas having large turbulence is rectified when passing through the gap between the preheating fins 23, and at the same time its temperature rises. Since this rectified and temperature-raised premixture burns in the burner head 16,
The combustion characteristics are improved, the flame is stabilized, and the combustion noise is reduced. Then, the combustion heat received by the heat receiving unit 22 is immediately conducted to the inclined vaporizing unit 19, so that the use time of the heater 24 can be shortened, and as a result, the electricity bill can be reduced. In addition, uniform room
Since the temperatures of the burner 15 and the burner head 16 rise rapidly due to the radiation of the flame, the vaporized gas does not condense.

In addition, when the kerosene is the deteriorated kerosene, the deteriorated kerosene that cannot be completely vaporized in the inclined vaporization section 19 and the bottom vaporization section 21 flows down to the mixing passage 17 and collides with the preheating fins 23 to be disturbed to improve the heat transfer coefficient. Spread 23 surfaces. As a result, the altered kerosene can be vaporized, so that the production of tar can be suppressed.

Effects of the Invention As described above, the following effects can be obtained according to the oil combustion device of the present invention.

(1) Since the preheating fins are formed so as to protrude from the inner wall of the mixing passage, the vaporized air whose temperature has increased when passing through the gap between the preheating fins heats the uniform chamber and the burner head. As a result,
Good ignition can be achieved and white smoke and odor can be prevented.

(2) Since the vaporized air is supplied at a low speed, the total amount is small, and therefore, the vaporized portion is not greatly cooled.
The uniform chamber and the burner head can be heated without significantly lowering the temperature rise in the vaporizing section.

(3) Further, during combustion, the premixed air is rectified when passing through the gap between the preheating fins, and at the same time its temperature rises. Since the rectified and temperature-raised premixed gas is burned in the burner head, the combustion characteristics are improved, the flame is stabilized, and the combustion noise is reduced.

(4) Since the preheating fins are formed so as to be inclined in the flow direction, the deteriorated kerosene that has not completely vaporized in the vaporization chamber and has flowed down into the mixing passage collides with the preheating fins and is disturbed to improve the heat transfer coefficient.
And the surface of the preheating fin is spread. As a result, the altered kerosene can be vaporized, so that the production of tar can be suppressed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil combustion apparatus according to an embodiment of the present invention, FIG. 2 is a side sectional view of a main part of the apparatus, FIG. 3 is an enlarged perspective sectional view of a main part of the apparatus, and FIG. FIG. 5 is a block diagram showing a control system of the device, and FIG. 6 is a characteristic diagram showing a temperature change during a preheating operation of an oil-fired device according to one embodiment of the present invention and a conventional example. FIG. 7 is a sectional view of a conventional oil combustion apparatus. 15 ... uniform chamber, 16 ... burner head, 17 ... mixing passage,
18… Evaporation chamber, 23… Preheating fins, 29… Combustion fan,
32… Combustion fan controller.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-49417 (JP, A) JP-A-58-128350 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23D 11/10 F23D 11/40

Claims (1)

(57) [Claims] 1. A burner head provided at an upper part of a uniform chamber having a bottomed box, a vaporizing chamber, a mixing passage formed at a lower part of the vaporizing chamber, and the vaporizing chamber protruding above the burner head. The provided vaporizing section, a combustion fan communicating with the main vaporizing chamber, a plurality of preheating fins protruding from the inner wall of the mixing passage and formed to be inclined in the flow direction, and the vaporizing chamber when the vaporizing chamber is preheated. An oil combustion device comprising: a combustion fan controller that operates the combustion fan at a low speed when the temperature is equal to or lower than a preheating determination temperature.