JPS60196517A - Control mechanism for soot of burner - Google Patents

Abstract

PURPOSE:To maintain combustion oil at an optimum pulverizing condition and to improve combustion efficiency, by a method wherein, through continuous measurement of soot concentration in the flame of a burner, the area of a nozzle is varied, and the flow rate of the air for combustion is controlled. CONSTITUTION:An injection nozzle 11 at the forward end of a burner 2 is structured so that the area of the injection nozzle is varied. Namely, through longitudinal movement in the direction an axis of a fuel oil passage 13 by means of a step motor 31, a shield plate 10, attached to the forward end of an oil nozzle 4, is moved longitudinally. A soot sensor 38 emits laser rays, and from a decrease in an amount of light entering a collecting part 39, soot concentration in a flame 30 is measured. An output signal from the soot sensor 38 is received by a regulator 40, and a signal, correcting displacement of soot concentration from a previously set value, is inputted from the regulator 40 to a regulator 34 and a flow rate regulator 20. This operates the step motor 31, causes the optimum atomizing condition of combustion oil to be maintained through variation of the area of the injection nozzle 11 at the forward end, and also controls a flow rate of the air for combustion in response thereto.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention involves atomizing fuel oil using an atomizing medium and injecting it from the tip injection port of a burner nozzle, and injecting combustion air from the air injection port surrounding the tip injection port. This invention relates to a soot suppression mechanism that maintains the optimal atomization state of combustion oil in a burner that spews out soot.

[Background of the invention]

First, the configuration and operation of the conventional example will be explained based on FIGS. 1 and 2. Air is fed as an atomizing medium into the burner nozzle 2 through the inflow pipe 1, and a part of the fed atomizing medium passes through the hole 3 and the fuel oil coming out from the fuel spout 5 of the oil nozzle 4 is aerated. Inner surface 7 of nozzle 6
It is supplied as a rotating light to make it look like something. The remaining atomized medium passes through the hole 8, passes through the tip injection port 11 formed as a gap between the tip of the burner nozzle 20 main body 9 and the shielding plate 10, and is blown out.

The fuel oil is supplied to the fuel oil passage 13 through the inflow pipe 12, guided to the fuel outlet 5, and exits inside the air nozzle 6. As described above, the fuel oil discharged to the inside of the air nozzle 6 flows while adhering to the inner surface 7 of the air nozzle 6, collides with the shielding plate l-O, is atomized by the atomizing medium, and passes through the tip injection port. 11 is injected outward.

An air seal 14 is installed at a portion of the inflow pipe 12 that penetrates the main body 9 of the burner nozzle 2.
is fixed by an air seal stopper 15.

The combustion air passes through the inlet pipe 16 and is ejected from the air outlet 17 surrounding the burner nozzle 2, and is mixed with the atomized combustion oil.

The respective flow rates of the atomizing medium, combustion oil, and combustion air are determined by a flow rate controller 18. installed in each inlet pipe 1.12.16.
19 and 20, the temperature inside the furnace 24 is adjusted to the set temperature. Each flow rate regulator 18.19.20 is connected to a flow meter 21.22.23 provided in each inflow pipe 1.12.16.
Pulp 27, 28 provided in each inlet pipe 1, 12, 16 by the feedback signal from Each flow rate is adjusted by opening and closing .29.

However, in the conventional example described above, the area of the tip jet port 11 is β1.
Since this is not unusual, the blowing speed of the atomizing medium decreases when the burner load is medium to low.

In this state, in order to increase the atomization of the combustion oil and bring the temperature inside the furnace 24 to the set temperature, the current flow of the atomizing medium is increased, which causes the atomizing medium (air) to become atomized.
It is necessary to increase the blowing speed, which has the disadvantage of increasing exhaust gas loss. Therefore, conventionally,
The amount of oxygen in the exhaust gas is measured, and this shows the atomization state, that is, the combustion state! A mechanism is provided to indirectly monitor and control the sugar content, but this mechanism supplies more air with a small safety factor in mind when the air breaks at the smoking limit, so it depends on the burner load and other factors. It could not be said that it was sufficient to maintain the combustion oil in an optimal atomization state regardless of the changes in the amount.

If the combustion atomization is low, the degree of soot sterilization will increase as residue in the flame. Conversely, if the atomization is high, the degree of sootness decreases. Therefore, by measuring the soot concentration in the optimal atomization state in advance, it is possible to maintain the combustion oil in the optimal atomization state at all times by directly and continuously measuring the soot concentration in the flame. becomes.

[Purpose of the invention]

The present invention was developed in view of the above circumstances, and is a burner that maintains combustion oil in an optimal atomized state regardless of changes in burner load and other factors, improves combustion efficiency, and does not increase exhaust gas loss. The purpose is to provide a soot control mechanism.

[Summary of the invention]

In order to achieve the above object, the present invention has a structure in which the area of the tip nozzle is variable, and a soot sensor detects the degree of soot in the flame of the burner, and an output signal from the soot sensor is used to detect the soot nozzle. The combustion oil is characterized in that the optimal atomization state of the combustion oil is maintained by controlling changes in the area of the combustion air and the flow rate of the combustion air to achieve a preset soot concentration.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 3 shows a principle diagram of the control mechanism according to the present invention, and FIG. 4 shows an enlarged sectional view of the main parts. The area of the tip injection port 11 is formed in a variable structure. The variable structure is constructed by forming the fuel oil passage 13 so as to be movable back and forth in the axial direction, and by moving the shielding plate 10 attached to the tip of the oil nozzle 4 back and forth. A mechanism for moving the fuel oil passage 13 back and forth includes a step motor 31. That is,
The base end of a shaft 32 connected to the rear end of the fuel oil passage 13 is rotatably screwed 33, and the shaft 32 is rotated by the magnetic force generated between magnets 35 and 36 in response to an output signal from a controller 34. This moves the fuel oil passage 13 back and forth. Since the fuel oil passage 13 moves back and forth, it is communicated with the inflow pipe 12 through a flexible tube 37.

38 is a soot sensor, the nuclear soot sensor 38 detects the degree of soot in the flame 30, and 39 is a light receiving part. The soot sensor 38 emits a laser beam, which is absorbed by the soot in the flame 30 and enters the light receiving section 39 . The soot concentration in the flame 30 is measured from the decrease in the amount of light incident on the light receiving section 39. A controller 40 receives the output signal from the soot sensor 38, detects a deviation from a preset soot level, inputs an output signal for correcting the deviation to the controller 34, and controls the combustion The flow of air is also input to the thoracometer 20.

The controller 34 receives an output signal from the controller 40 and a controller 26 which receives a detection signal from the temperature detector 25 in the furnace.
It operates in response to the output signal from. The rest of the configuration is the same as that of the conventional example, so the same parts are given the same reference numerals and the explanation will be omitted.

Next, the present invention will be explained in detail. When the burner load changes and the atomization state of the combustion oil changes, the soot concentration in the flame 30 changes, which is detected by the soot sensor 38. Then, a signal for correcting the deviation of the soot concentration from a predetermined set value is inputted from the controller 40 to the controller 34 and the flow rate controller 20.

As a result, the step motor 31 is actuated to change the area of the tip jet port 11 to maintain the optimal atomization state of the combustion oil, and to control the flow rate of the combustion air accordingly.

〔Effect of the invention〕

According to the present invention, by directly and continuously measuring the degree of soot in the flame of a burner using a soot sensor, the area of the tip nozzle is changed based on the output signal from the soot sensor, and the flow rate of combustion air is changed. As a result, the combustion oil can be maintained in an optimal atomized state regardless of changes in burner load or other factors, which improves combustion efficiency and also increases exhaust gas loss. There's nothing to do.

[Brief explanation of drawings]

Fig. 1 is a principle diagram of a conventional control mechanism, Fig. 2 is a sectional view of the main parts thereof, Fig. 3 is a principle diagram of the control P & structure according to the present invention, and Fig. 4 is an enlarged sectional view of the main parts. . 2... Burner nozzle, 11... Tip injection port, 17
...Air outlet, 30...Flame, 38...Soot sensor. Agent Tatsuyuki Unuma (and 1 other person)

Claims (1)

[Claims] In a burner configured to atomize fuel oil using an atomizing medium and inject it from the tip injection port of a burner nozzle, and to blow out combustion air from an air injection port surrounding the tip injection port, the area of the tip injection port is variable. It is equipped with a soot sensor that detects the soot content in the flame of the fuel, and changes the area of the tip injection port and the flow rate of the combustion air based on the output signal from the soot sensor. A burner soot control mechanism characterized by controlling.