JPS5927113A - Combination oil and gas burner - Google Patents

Abstract

PURPOSE:To respond to changing energy situation by a method wherein the axial flow burner, which can be used with either or both of oil fuel and gas fuel, is obtained. CONSTITUTION:A control motor 20 controls both the injecting amount of gas fuel by vertically oscillating an driving arm 22 to regulate the opening of a gas regulating valve 12 through a link mechanism and that of oil fuel by driving an driving arm 23 to regulate the opening of an oil regulating valve 6. On the one hand the control motor 20 brings the opening of the oil regulating valve 6 to that for optimum oil flow rate or that of the gas regulating valve 12 to that for optimum gas flow rate by being put into actuation with the output depending upon the result of comparison between the input value, which is obtained by detecting the temperature of the substance to be heated in order to maintain said substance at a desired temperature in a heating apparatus, and the set value as a controlled variable to apply and on the other hand controls the taking-in of the combustion air optimum for combustion by regulating the opening of a damper 3 by means of the driving of a driving arm 18.

Description

Detailed Description of the Invention The present invention provides an axial flow blower having an axial blower for blowing combustion air inside a cylindrical body and an injection nozzle for injecting fuel at an axially open end of the cylindrical body. This invention relates to burners, and particularly to axial flow burners that can be used for both oil and gas.

In recent years, the energy situation has been trending away from petroleum, and LNG
(natural gas...city gas), LPG (propane, butane) are rapidly increasing their share of total energy consumption, and these gas fuels are being introduced into large burners.

In view of the above points, it is an object of the present invention to respond to changing energy conditions by providing an axial flow burner that can be used with either oil fuel or gas fuel.

Hereinafter, the present invention will be explained based on the drawings.

1 is an axial flow blower installed in the cylindrical body 2, and the air flow ↑
A desired amount of combustion air is taken in from one end of the cylindrical body 2 by opening and closing the damper 3 for adjustment, and is exhausted from the end by rotating the passage within the cylindrical body 2. Reference numeral 4 designates a mail injection nozzle disposed at the axis η11 of the cylindrical main body 2, and the one shown in Example C is a ricken type. The secondary oil injection inhibition is adjusted by adjusting the valve opening. 7 is oil spray
・It is a swirling vane placed in front of one nozzle 4, in which a plurality of vanes are overlapped in a q 1 shape with a slight interval, and the combustion air passing through the gap is swirled,
A hole is provided in the center through which the flame of the mail injection nozzle 4 passes. This swirling vane 7 swirls the combustion air in a vortex, and mixes the mail ejected from the oil injection nozzle 4 or the gas ejected from the dregs injection nozzle, which will be described later, without suddenly getting involved in the IM, thereby realizing a stable flame shape. let 8 is a gas injection nozzle disposed around the swirling blade 7. It is a gas injection nozzle, and has a large number of small holes 8 on the front surface of a ring-shaped tube body.
A is opened, and gas fuel is ejected from the small hole ga toward the front axis. Reference numeral 9 denotes a gas box installed around the outer periphery of the cylindrical main body 2. The gas box 9 is arranged around the outer periphery of the cylindrical body 2, and is designed so that the performance of the axial flow blower 1 can be fully demonstrated without putting any resistance on the flow path of the combustion air taken in by the axial flow blower 1. It is provided outside the shaped main body 2. The gas box 9 communicates with the gas injection nozzle 8 via a plurality of branch square pipes 10. Although a ring-shaped nozzle is used as the gas injection nozzle 8 in the embodiment, separate nozzles may be provided at the tips of the branch pipes 10, respectively. Il! -1' This is a gas supply pipe connected to the gas box 9, and a gas adjustment valve 12 for adjusting the amount of gas injection is provided in the middle of the pipe. I
Reference numeral 3 designates a pilot burner used for ignition when exclusively burning gas fuel.The tip nozzle part of the pilot burner passes through the swirl vane 7 and is located in the front. gush out.

) 5 is a mixing adjustment plate that narrows the passage cross-sectional area of the combustion air flowing inside the cylindrical body 2, and is provided with a circular slit in the center, which throttles the combustion air for combustion. Burner throat 16
The wall is designed to direct the combustion air to the center without spreading, promoting mixing of the combustion air with the ejected fuel, and adjusting the shape of the flimsy flame. The diameter of the circular slit portion is appropriately selected and determined through experiments so as to provide a flame shape that is suitable for the furnace.

By reducing the diameter of the slit portion of the mixing adjustment plate 15 to narrow down the cross-sectional area of the combustion air passage, the flow velocity of the combustion air will be increased, the penetration of the combustion air into the flame will be reduced, and the combustion air will be mixed with the fuel. It is also possible to make it removable and attach a mixing adjustment plate with an appropriate slit diameter depending on gas combustion or oil combustion. Dannogu-3 for heritage control
The 17.1 gear is assembled by combining two roughly semicircular gears that are divided into two parts, and meshes with a pair of fan-shaped gears provided on the support shaft. a crank arm 21 which is a drive arm and is connected to a control motor 20 fixed to a fixed base 19;
It is pivoted to. Furthermore, the I troll motor 20 swings up and down the drive arm 22 that adjusts the valve opening of the gas regulating valve 12 via a link mechanism to control the injection amount of gas fuel, and also opens the oil regulating valve 6. The injection amount of oil and fuel is controlled by driving a drive arm 23 that adjusts the amount of oil and fuel. In order to maintain the heated object in the heating device at a desired temperature, this control motor 20 detects the temperature of the heated object, compares the input value with the set value, and uses the output depending on the comparison as the control application amount. In addition, it is activated to set the oil adjustment valve 6 to the optimum oil amount opening, or the gas adjustment valve 12 to the optimum gas amount opening, while driving the drive arm 18 to adjust the opening of the damper 3, thereby controlling the combustion. The combustion air is controlled to take in the optimum amount of combustion air.

Further, since the amount of combustion air required for oil combustion and gas combustion is different, the opening adjustment range of the wind and play adjustment damper 3 must be changed by changing the fuel, and this will be explained below.

The calorific value of city gas (+3A) is approximately l l 000KCa
The calorific value of e/, NnfS oil is I 0000~l I
0OOK, Cal/Kq, and if you choose and use these fuels now, the gas Nn and the oil g
The calorific value per unit is almost the same, and each theoretical air meter is also almost the same. Then, the gas t/'im-(
Gas combustion requires approximately 1 to 20% less air for combustion than oil combustion, so when changing fuels, adjust the amount of combustion air. Changing the upper and lower limits of the damper 3 opening according to the fuel 8
There is trade. Gas combustion requires less combustion f11 air than sub-oil combustion, but the specific amount of air to be removed is determined by the fuel selected.

Now, when burning oil, the lower limit of the damper's opening + i is set to 2
0 = 1. , the lower limit of the opening length of the damper 3 is set to 0% (not fully closed, but takes in combustion air commensurate with the minimum amount of gas burned), and 10% during scum combustion. The following explanation assumes that good combustion can be maintained if the culm degree is set to 80%.

The upper and lower limits of the opening adjustment range of the damper 3 are set by four microswitches SL, SL, S2, and S installed to detect the entire rotation angle of the drive shaft of the control motor 20.
I'm going to HK. FIG. 4 shows a diagram B of the tc microswitch mounted on the control motor 20, and the @ line indicates the energized state (ON state). Microsinch 5L (r-J damper opening 0%
(The microswitch actually detects the rotation angle of the drive shaft of the control motor 3 corresponding to the damper opening R).
Power is on when f20 or less, micro switch S27″i
The micro switch 5HtI'i is energized when the damper opening is SO% or more, and the micro switch 5HtI'i is energized when the damper opening is 1oo%.
It is adjusted by the N-OFF cam.

FIG. 5 shows the principle of an electric control circuit for controlling the control motor 2o, and its configuration will be explained below.

In the figure, 24 is a combustion control device that controls the rotation direction and amount of rotation of the control motor 2o, and inputs a signal depending on a comparison between the temperature of the heated object detected by a detection means (not shown) and a set value as the control application amount. , controls the control motor 20 that adjusts the combustion amount, and when the temperature of the heated object is higher than the set temperature 1, the movable piece 25a is brought into contact with the contact 25b [KYx, the closed fill 26 is excited, and the control [J - The motor 20 rotates in reverse, reducing the amount of combustion. Further, when the humidity of the object to be heated is lower than the set humidity, the movable piece 25a is brought into contact with the contact point 25C, the open coil 2'7 is energized, the control motor 20 rotates normally, and the amount of combustion increases. Reference numeral 28 denotes a combustion range shift circuit that shifts the combustion range by selecting either A-il combustion or dregs combustion, and when gas combustion is selected, the selector switch 2'? Connect a to Xi 29b and 1-, and when selecting J oil combustion, connect switch 29a to contact 29C.
so that it is in contact with Changeover switch 2'? a to contact 29
The changeover switch 2'? a as contact point 2'? When touching C, the movable 3Qa is the other contact 300K, and the mouth f moving piece 31a is the other contact 310
Make the circuit so that it is in contact with 5L-b, S l-b
, 52-b, and 5H-b are microswitches SL attached to the control motor 20.

These are the b contacts of Sl, S2, and SH, and 5l-a is the a contact of the microswitch S1. 32 is an indicator that detects the amount of rotation of the control motor 20 and displays the amount of combustion.

Therefore, when burning gas fuel with the axial burner of the present invention, if the switch 29a of the combustion range shift circuit 28 is brought into contact with the contact 29b on the gas combustion side, the combustion range shift circuit 28 will send the damper 0% close signal. The current flowing through the movable piece 30a excites the closing coil 26, and the control motor 20 reverses to move the gas regulating valve 12 and the damper 3 in the closing direction via the 1-link mechanism. When the opening degree reaches 0% (the gas regulating valve 12 reaches the minimum combustion opening degree commensurate with the opening degree 0% of the damper 3), the microswitch SL is turned on and the b contact 5 is turned on.
L-b is opened, the closed coil 26 is de-energized, and the control motor 20 t' is stopped. Now the preparation for gas combustion is complete, open the main valve of gas supply pipe 110.
First, the pilot burner 13 is ignited, and then the gas injection nozzle 8 injects liquid gas. The combustion range shift circuit 28 is designed to be independent of the combustion control electric circuit once ignition occurs. After ignition, combustion control is performed by the control device 24, and when the humidity of the object to be heated is lower than the set humidity, the 1 part 1 moving piece 25a in the control device N24 comes into contact with the contact 250, and the open coil 27 is fully energized to activate the control motor. 2
0 in the normal direction to increase the combustion amount, and when the damper opening reaches 80% (maximum gas combustion) K, the micro switch S2 attached to the control motor 20 turns ON, and the contact 32-b opens completely and opens. The coil 27 is de-energized,
The control motor 20 is stopped to maintain maximum gas combustion. In this way, the gas combustion is restricted to the combustion chamber when the damper 3 is opened between 0 and 80%.

Next, A-il combustion will be described. Since the damper 3 has returned to the open 1 0 . Connect a to contact 2' on the oil combustion side? When contacting C, the combustion range shift circuit 28 issues a damper 20% open signal, and when the damper 3 opening is 0%, the microswitch S1 is in the ON state, so a
Contact 5t-a (/'i is closed, so open coil 2
A current flows through 7 and excites it to cause the L1 control motor 20 to rotate forward and move the damper 3 in the opening direction. When the damper opening reaches 20 (minimum oil combustion amount), the microswitch St is turned OFF. The a contact 5l-a is opened, the open coil 27 is de-energized, the engine motor 20 is stopped, oil combustion preparations are completed, oil is jetted from the oil injection nozzle 14, and the ignition rod (not shown) is fired. Ignition occurs due to the spark generated. Hereinafter, the opening of the damper 3 will be 20 to 80 with the same effect as described for gas combustion.
Combustion is controlled between %.

As described above, the axial flow burner of the present invention has an oil injection nozzle 4 and a gas injection nozzle 8 in the cylindrical body 2, and can use oil fuel and gas fuel properly, and can also switch smoothly. It is an economical device.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway schematic front view of an embodiment of the present invention, Fig. 2 is a side view of the stand in Fig. 1, Fig. 3 is a partially omitted left side view of Fig. 1, and Fig. 4. Is the state of the microswitch attached to the control motor 20 i? 141, m5 is a diagram showing the principle of an electric control circuit that controls the Huntroll motor 20. 1-----・Axial flow blower 2----- Partial body
3------Wind +tt control damper 4------
i oil injection nozzle 6---=x oil adjustment valve 7-
-----Swirl vane 8------Scrap jet q/[Nozzle q------One scrap box I O-1------
Branch pipe 12-m-Gas adjustment valve 20----Control motor 24-m=Combustion control device 2b
--- One closed film 27 --- Some coils 2g
----1 Combustion Range Shift Circuit Patent Applicant: Nikko Co., Ltd.; A- Figure 3 Figure 2

Claims (2)

[Claims] (1) An axial flow blower is installed inside the cylindrical body, and a damper for adjusting the air volume that adjusts the combustion air taken in by the axial flow blower injects mail fuel toward the open end in the axial direction of the cylindrical body. A gas box in which an oil injection nozzle kffd is installed, a gas injection nozzle for injecting gas fuel is arranged around a swirling vane arranged in front of the oil injection nozzle, and the gas injection nozzle is arranged around the outer periphery of a cylindrical body. is connected to the control motor via a link mechanism for communicating with L1 through a plurality of branch pipes and controlling the damper for adjusting the air volume, the oil adjusting valve and the gas adjusting valve for adjusting the number of fuel injections in an interlocked manner. A burner that can be used for both oil and gas. (2) The rotation angle range of the control motor is adjusted so that the opening adjustment range of the air volume adjustment damper can be changed in order to intake air for thermal firing commensurate with the selected fuel (mail or gas). An oil/gas burner according to claim 1, which is provided with a changing electric circuit.