JPS5923959Y2 - liquid fuel combustion equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to a strong supply/exhaust type liquid fuel combustion device that forcibly ignites atomized fuel in the atomized state without vaporizing it with a heater. The purpose is to prevent fluctuations in the amount of air supplied to the pilot burner due to pressure fluctuations in the combustor main body, such as the combustion chamber, by installing an air pressure regulator inside the air supply pipe to the pilot burner.

In general, the means for atomizing liquid fuel using a rotary cone, scattering plate, and stirring plate, vaporizing the atomized fuel using a heater, and igniting the vaporized fuel gas using an ignition device to burn it, is carried out until the start of combustion. It takes time.

Therefore, in order to shorten the time required to start combustion, a method has been devised in which a pilot burner for ignition is provided in the combustion chamber close to the main burner, and the atomized fuel is forcibly ignited by the pilot burner.

In the forced supply/exhaust type liquid fuel combustion device using the pilot burner described above, the combustion chamber is
The temperature of the combustor body, such as the main burner, changes greatly, and the temperature change in the combustor body leads to a change in the energy retained in the internal gas of the combustor body. pressure changes.

By the way, the pressure rise in the internal gas mainly occurs as a resistance to combustion ventilation to the main burner, but normally the air supply pipe to the pilot burner is installed branching off from the combustion air path in the combustor main body. Since the combustor main body is less affected by temperature changes, when the pressure of the internal gas increases, the ventilation resistance of the air supply pipe is lower than that of the combustion air passage of the combustor main body.

Therefore, when the internal gas pressure of the combustor body increases, the ventilation resistance of the air supply pipe becomes relatively smaller than that of the combustion air path, so the amount of ventilation to the air supply pipe increases, and the pilot flame becomes stable. , causing inconveniences such as blow-out.

This idea focuses on the fact that foamed metals, etc. exhibit a large resistance to high-pressure ventilation, but have a small resistance to low-pressure ventilation. installed inside the air supply pipe to the pilot burner,
Even when the internal pressure of the combustor body increases, the amount of air supplied to the pilot burner is stabilized.Next, this invention will be explained in detail with reference to a drawing showing one embodiment thereof.

1 is a main burner facing the cylindrical combustion chamber 2; 3 is a rotary cone 5 fixed to the rotating shaft 4' of a motor 4; and a scattering plate 6.
and a rotating atomizer consisting of a stirring plate 7; 8 is a rotating atomizer 3;
The main burner head is installed in front of the burner head and has many slits.

9 is a fuel nozzle that drips fuel from the fuel tank 10 onto the rotary cone 5; the fuel dripped from the fuel nozzle 9 onto the rotary cone 5 travels through the rotary cone 5, and is scattered and Stir and atomize.

Reference numeral 11 denotes a driving chamber/air blowing chamber in which the motor 4 is installed;
It is located behind the main burner 1.

12 is a blower fan rotated by the motor 4, and the blower fan 12 controls the main burner 1 and the combustion air path 1.
Primary air and secondary air are supplied to the combustion chamber 2 via the combustion chamber 3 .

Reference numeral 14 indicates an intake pipe that communicates with the ventilation chamber 11 and takes in outdoor air; 15 indicates a fuel control body connected to the fuel tank 10 via a pump 16; Pressure transmission pipe 18 communicating with chamber 11
is connected to control the fuel supply amount.

Reference numeral 19 is a pipe for sending fuel from the fuel control body 15 to the fuel nozzle 9, and a solenoid valve 20 is interposed between the fuel nozzle 9 and the pipe 19.

21 is a pilot burner for igniting the main burner 1 provided in the combustion chamber 2 in the vicinity of the main burner 1; 22 is a cylindrical pilot burner body with a nozzle-shaped tip; 23 is a pilot burner body 22; 24 is an air chamber formed in the lower part of the pilot burner main body 22; 25 is an air supply pipe that communicates the air chamber 24 with the combustion air passage 13;
The air passing through is divided into the air supply pipe 25 and the air chamber 24
Air flows into the pilot burner body 22 from the air chamber 24.

Reference numeral 26 denotes an air pressure regulator made of foamed metal or the like, which is installed in an appropriate amount on the combustion air path 13 side of the air supply pipe 25. The air pressure regulator 26 does not exhibit much resistance to low-pressure ventilation, and It has the function of increasing resistance as the pressure increases.

27 is a flame detection rod for detecting flame; 28 is a number of pipes 29 that face the main burner 1 on one side and communicate with the combustion chamber 2;
30 is a collection/discharge chamber provided on the other side of the heat exchanger 28 and each pipe 29 is connected thereto; 31 is a collection/discharge chamber 30
The combustion gas in the combustion chamber 2 passes through each pipe 29 of the heat exchanger 28 and is once collected in a collection/discharge chamber 30, and then is discharged outside through the exhaust pipe 31.

Therefore, in the embodiment, when the combustor is driven, the temperature of the combustor main body such as the combustion chamber 2 rises, and the gas pressure in the combustion air passage 13 increases; Accordingly, the ventilation resistance force of the air pressure regulator 26 also increases, and the increase in the amount of air to the pilot burner 21 is alleviated.

That is, in the past, the air supply pressure for the pilot burner 21 increased in direct proportion to the pressure in the combustion chamber 2, as shown by curve A in FIG.
6, the airflow rate is controlled by the curve 8 in FIG. is prevented, and the stabilization of the pilot flame is maintained.

In the above embodiment, a foamed metal was used for the air pressure regulator 26, but a spongy material similar to the foamed metal may be used.

As mentioned above, according to the liquid fuel combustion device of this invention,
A pilot burner for igniting the main burner is provided in the combustion chamber close to the main burner, and an air supply pipe communicating with the combustion air path of the main burner is connected to the pilot burner.
By installing an air pressure regulator in the air supply pipe that increases resistance as the ventilation pressure goes from low to high, air for the pilot burner can be stably supplied even if the pressure of the internal gas in the combustion chamber etc. fluctuates. This prevents inconveniences such as the pilot flame blowing out.

Furthermore, since the influence of the air supply amount to the main burner and combustion chamber on the air supply amount to the pilot burner is reduced, the supply of combustion air to the main burner etc. can be stabilized regardless of the main burner, and the combustion amount can be reduced. A combustor can be freely selected, fuel consumption can be freely selected, and a very economical combustor can be obtained.

[Brief explanation of the drawing]

The drawing shows one embodiment of the liquid fuel combustion device of this invention,
FIG. 1 is a cutaway front view, FIG. 2 is an enlarged cutaway front view of the main part of FIG. 1, and FIG. 3 is a diagram showing the relationship between combustion chamber pressure and pilot burner air supply pressure. 1... Main burner, 2... Combustion chamber,
13...Combustion air path, 21...Pilot burner, 25...Air supply pipe, 26...
Air pressure regulator.

Claims (1)

[Scope of utility model registration request] A pilot burner for igniting the main burner is provided in the combustion chamber in close proximity to the main burner, and an air supply pipe communicating with the combustion air path of the main burner is connected to the pilot burner, and the air supply pipe is provided with ventilation from a low pressure. A liquid fuel combustion device equipped with an air pressure regulator that increases resistance as the pressure increases.