Dual-fuel burner

Abstract

A dual-fuel burner belongs to the technical field of burner equipment and comprises a burner body, an electromagnetic valve, fuel oil atomization equipment, an air compressor, a burning efficiency detection circuit, an adjusting circuit and a bottom plate. One end of a gas pipe of the burner body is connected with one end of a first electromagnetic valve, the other end of the first electromagnetic valve is connected with a natural gas pipe, and the fuel oil atomization device comprises an oil tank, an electric proportional valve, an oil spraying head, a pressure switch and an electromagnetic valve A. The fuel oil atomization device and the burner body are installed together. A light-emitting diode and a photoelectric triode matched with the combustion efficiency detection circuit are installed at the tail end of a smoke outlet of a chimney of the combustor, and the combustion efficiency detection circuit and the adjusting circuit are installed in the element box and electrically connected. Fuel gas or fuel oil can be conveniently switched to serve as fuel, application is more flexible, a worker can be prompted to overhaul and debug in time through the alarm when combustion is insufficient, and high combustion efficiency is guaranteed as much as possible. In conclusion, the device has a good application prospect.

Description

Technical Field

[0001] This utility model relates to the field of burner equipment technology, and in particular to a dual-fuel burner. Background Technology

[0002] An industrial burner is a type of equipment used in boiler and metal heat treatment processes. The fuels used in industrial burners generally include fuel oil and fuel oil. During operation, the combustion air and fuel oil, either atomized or supplied by the fan at the rear of the burner's air box, enter the mixing cylinder simultaneously and are then ignited at the front of the burner head (specifically, the burner ignition gun generates an electric spark to ignite the fuel oil or fuel oil, and then automatically stops ignition). The fuel oil or fuel oil burns in the furnace, providing a heat source for the heated equipment.

[0003] Although existing industrial burners meet operational needs to some extent, their structural limitations restrict their functionality to using only a single fuel. For example, burners using natural gas as fuel cannot use atomized fuel oil. This restricts the application range of burners and has some adverse effects on their use (for instance, a generator driven by a steam turbine in a production site may not be able to use fuel oil due to various reasons when the natural gas supply is interrupted, and it will not be able to generate electricity normally during the period when the natural gas supply is restored). Therefore, it is very necessary to provide a burner that can use both natural gas and fuel oil and has combustion efficiency monitoring functions. Utility Model Content

[0004] To overcome the shortcomings of existing industrial burners due to structural limitations, as described in the background, this utility model provides a dual-fuel burner based on the industrial burner body. During operation, operators can easily switch between using natural gas or oil as fuel through a simple power switch, making the application more flexible. This ensures that equipment using the burner as a heat source can operate normally as much as possible, and it can monitor combustion efficiency in real time. When combustion is incomplete, it can promptly prompt operators to carry out maintenance and adjustments, thus ensuring high combustion efficiency.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A dual-fuel burner includes a burner body, a solenoid valve, a fuel atomizing device, an air compressor, and also features a combustion efficiency detection circuit, an adjustment circuit, and a base plate. One end of the gas pipe of the burner body is connected to one end of a first solenoid valve, and the other end of the first solenoid valve is connected to a natural gas pipe. The fuel atomizing device includes a fuel tank, an electric proportional valve, a fuel injector, a pressure switch, and solenoid valve A. A connecting pipe is installed inside the air box of the burner body, with one side of the connecting pipe located inside the mixing cylinder of the burner body. One side of the fuel injector and one side of the connecting pipe are fixedly installed together. The other side of the connecting pipe is connected to the liquid outlet of the electric proportional valve. The burner body and the fuel tank are respectively mounted on the base plate. The inlet end is connected to one end of the second solenoid valve, and the other end of the second solenoid valve is connected to the outlet pipe of the oil tank. A refueling pipe is installed at the top of the oil tank. The air inlet pipe of the pressure switch and the air outlet pipe at the bottom of solenoid valve A are respectively installed on one side of the top of the oil tank. The air inlet pipe of solenoid valve A is connected to the exhaust pipe of the air compressor's air tank. The combustion efficiency detection circuit is equipped with a light-emitting diode and a phototransistor. The light-emitting diode and the phototransistor are installed at the end of the exhaust port of the burner chimney. The combustion efficiency detection circuit and the adjustment circuit are installed in the component box. The signal input end of the electric proportional valve and the signal output end of the adjustment circuit are electrically connected. The power output end of the pressure switch and the power input end of solenoid valve A are electrically connected.

[0007] Furthermore, the valve core of the solenoid valve and solenoid valve A is a normally closed structure.

[0008] Furthermore, the regulating circuit includes an adjustable resistor and a resistor and a voltmeter that are electrically connected. One end of the adjustable resistor and one end of the resistor and the positive power input terminal of the voltmeter are connected, and the negative power input terminal of the voltmeter and the other end of the resistor are connected.

[0009] Furthermore, the spray nozzle of the fuel injector is located on the burner head side of the burner body.

[0010] Furthermore, the combustion efficiency detection circuit includes an electrically connected resistor, a transistor, and an alarm, and is connected to a light-emitting diode and a phototransistor. One end of the first resistor and one end of the second resistor are connected to the positive power input terminal of the relay and the control power input terminal. The other end of the first resistor is connected to the positive terminal of the light-emitting diode. The other end of the second resistor is connected to the collector of the phototransistor. The emitter of the transistor is connected to one end of the fourth resistor, the negative power input terminal of the alarm, and the negative power input terminal of the light-emitting diode. The other ends of the third resistor and the fourth resistor are connected to the base of the transistor. The collector of the transistor is connected to the negative power input terminal of the relay. The positive power input terminal of the alarm is connected to the normally closed contact terminal of the relay.

[0011] The beneficial effects of this utility model are: (1) Based on the industrial burner body, the operator can easily switch between gas or oil as fuel by operating a simple power switch and two solenoid valves during operation. The operator can also easily adjust the amount of fuel entering the burner body, making the application more flexible and ensuring that the equipment using the burner as a heat source can work normally (when the gas supply is interrupted, it can switch to the burner body to provide liquid fuel); (2) The combustion efficiency detection circuit can monitor the combustion efficiency in real time. When the combustion is incomplete (due to incomplete combustion of the exhaust gas and reduced transparency of the exhaust gas), the alarm can promptly prompt the operator to carry out maintenance and adjustment, ensuring high combustion efficiency as much as possible. In summary, this utility model has good application prospects. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a partial structural schematic diagram of the present invention.

[0015] Figure 3 This is the circuit diagram of this utility model. Detailed Implementation

[0016] Figure 1 , 2As shown in Figure 3, the dual-fuel burner includes a burner body 1, a power module W1, solenoid valves DC1 and DC2, a fuel atomizing device, an air compressor (not shown in the figure), power switches S1 and S2, and also has a combustion efficiency detection circuit 2, an adjustment circuit 3, and a base plate 4. The lower end of the gas pipe of the burner body 1 is threadedly connected to the upper end of the first solenoid valve DC1, and the lower end of the first solenoid valve DC1 is connected to the natural gas pipe via a pipeline. The fuel atomizing device includes a fuel tank 51, an electric proportional valve M, an injector head 52, a pressure switch D1, and a solenoid valve ADC3. A connecting pipe 101 is horizontally welded to the middle of the inner side of the air box of the burner body (the outer end of the connecting pipe 101 and the air box 102 are sealed). The left end of the connecting pipe 101 is located inside the right end of the mixing cylinder 103 of the burner body (the outer end of the connecting pipe 101 and the mixing cylinder 103 are sealed). The right end of the oil injector 52 (with a spray hole in the middle of its left end) is fixedly installed together with the left end of the connecting pipe 101. The right end of the connecting pipe 101 is threadedly connected to the liquid outlet of the electric proportional valve M. The burner body 1 and the oil tank 51 are connected together. The lower ends are fixedly installed on the base plate 4. The inlet end of the electric proportional valve M and one end of the second solenoid valve DC2 are connected via a pipe joint. The other end of the second solenoid valve DC2 is connected to the outlet pipe at the lower left end of the fuel tank 51 via a pipe. A fuel filler pipe 53 is welded to the middle of the outer side of the upper end of the fuel tank 51 (through which fuel is added to the fuel tank). A sealing cap is threaded onto the upper end of the fuel filler pipe 53. The air inlet pipe of the pressure switch D1 and the air outlet pipe at the lower end of the solenoid valve ADC3 are fixedly installed on the upper right side of the fuel tank 51, and the air inlet pipe, air outlet pipe and fuel tank 51 are interconnected. Solenoid valve A The intake pipe of DC3 and the exhaust pipe of the air compressor's air tank are connected by a pipe; the combustion efficiency detection circuit is equipped with a light-emitting diode VL and a phototransistor Q1. The light-emitting diode VL and the phototransistor Q1 are mounted on a circuit board, and the light-emitting surface of the light-emitting diode VL and the light-receiving surface of the phototransistor Q1 are in a face-to-face spaced distance structure (3 cm apart). The circuit board is mounted on the exhaust port end of the burner chimney (temperature below 70°C). The power module W1, the combustion efficiency detection circuit 2, the adjustment circuit 3, and the power switch are installed in the component box 5 in the duty room.

[0017] Figure 1 , 2As shown in Figure 3, the valve cores of solenoid valves DC1, DC2, and ADC3 are normally closed. The adjustment circuit includes an adjustable resistor RP1, a resistor R1, and a voltmeter V connected via circuit board wiring. One end of the adjustable resistor RP1 is connected to one end of the resistor R1 and the positive power input terminal of the voltmeter V. The negative power input terminal of the voltmeter V is connected to the other end of the resistor R1. The display surface of the voltmeter V and the adjustment handle of the adjustable resistor RP1 are located outside the two openings at the front end of the component box 5, respectively. The spray nozzle of the fuel injector 52 is located on the left side and in the middle of the right side of the mixing cylinder. The combustion efficiency detection circuit includes resistors R2, R3, R4, and R5, transistor Q2, alarm B, and relay J1 connected via circuit board wiring. It is also connected to LED VL and phototransistor Q2 via wires. One end of the first resistor R2, one end of the second resistor R3, the positive power input terminal of relay J1, and the control power input terminal are connected. The other end of the first resistor R2 is connected to the positive terminal of LED VL. The other end of the second resistor R3 is connected to the collector of phototransistor Q1. The emitter of transistor Q2 is connected to one end of the fourth resistor R5, the negative power input terminal of alarm B1, and the negative power input terminal of LED VL. The other end of the third resistor R4, the other end of the fourth resistor R5, and the base of transistor Q2 are connected. The collector of transistor Q2 is connected to the negative power input terminal of relay J1. The positive power input terminal of alarm B is connected to the normally closed contact terminal of relay J1.

[0018] Figure 1 , 2 As shown in Figure 3, the power input terminals 1 and 2 of the power module W1 are connected to the two poles of the 220V AC power supply via wires. The power output terminals 3 and 4 of the power module W1 are connected to the two power switches S1 and S2, one end of the power input resistor R2 of the combustion efficiency detection circuit and the emitter of the transistor Q2, the other end of the adjustable resistor RP1 of the power input circuit and the other end of the resistor R1, and the power input terminals 1 and 2 of the electric proportional valve M via wires. The signal input terminal 3 of the electric proportional valve M is connected to the signal output terminal of the adjustment circuit and one end of the resistor R1 via wires. The power output terminals of the first power switch S1 and the second power switch S2, the negative power output terminal 4 of the power module W1, and the power input terminals of the first solenoid valve DC1 and the second solenoid valve DC2 are connected via wires. The power output terminal of the second power switch S2 and the power input terminal of the pressure switch D1 are connected by a wire. The power output terminal of the pressure switch D1, the negative power output terminal 4 of the power module W1, and the two power input terminals of the solenoid valve ADC3 are respectively connected by wires. Figure 3In the diagram, power module W1 is an AC 220V to DC 12V power module; solenoid valves DC1, DC2, and ADC3 are 2W normally closed solenoid valves; transistor Q2 is a 9013 (NPN); voltmeter V is a four-digit LCD voltage display meter with a DC 12V range; resistors R1, R2, R3, R4, and R5 have resistance values ​​of 1KΩ, 1.8KΩ, 100Ω, 47KΩ, and 5KΩ respectively; alarm B is an MF12V active continuous audible alarm; adjustable resistor RP1 has a resistance value of... It is 2K; LED VL is a red LED; phototransistor Q1 is model ZL-3DU5C; relay J1 is model DC12V; electric proportional valve M is model VA3100 electric proportional integral valve, which has two power input terminals and one signal input terminal. The higher the input voltage signal, the greater the valve core opening degree, and vice versa; adjustable resistor RP1 has a resistance value of 470K; pressure switch D1 is model QPM11-NC normally closed adjustable pressure power switch.

[0019] Figure 1 , 2As shown in Figures 1 and 3, this novel invention is based on an industrial burner body 1. During operation, the combustion air and fuel gas or atomized fuel oil output from the fan at the rear end of the burner air box 102 simultaneously enter the mixing cylinder 103 and are then ignited at the front end of the burner head 102 (specifically, the burner ignition gun generates an electric spark to ignite the fuel gas or fuel oil, and then automatically stops ignition). The fuel gas or fuel oil burns in the furnace to provide a heat source for the heated equipment (the above is existing mature technology and will not be elaborated upon in this application). After the AC 220V power supply enters the power input terminal of the power module W1, pins 3 and 4 of the power module W1 output a stable DC 12V power supply, which enters the power input terminals of the power switches S1 and S2, the electric proportional valve and regulating circuit, and the combustion efficiency detection circuit. The aforementioned circuits and the electric proportional valve are then energized and operate. When natural gas is required as fuel, the operator turns on power switch S1 (S2 off), energizing solenoid valve DC1 and opening its valve core. Natural gas then enters the burner through the open valve of solenoid valve DC1 and is injected from the front end of burner head 104, mixing with air and burning. The operator turns on power switch S2 (S1 off), energizing solenoid valve DC2 and opening its valve core. This allows atomized fuel in fuel tank 51 to enter the burner through the open valve of solenoid valve DC2 and be injected from the front end of burner head 104, mixing with air and burning. In this invention, when the solenoid valve DC2 is energized, if the pressure inside the fuel tank 51 is lower than a certain level (e.g., lower than 5.0 MPa), the internal contacts of the pressure switch D1 close. This allows 12V power to enter the power input terminal of the solenoid valve ADC3 via the pressure switch D1. The solenoid valve ADC3 then opens, allowing compressed air from the air compressor's storage tank to enter the fuel tank 51, pressurizing the liquid fuel (e.g., diesel) inside. The high-pressure fuel is then atomized and sprayed out through the spray nozzle on the left side of the injector head 52 via the electric proportional valve M. If the pressure inside the fuel tank 51 is high... At a certain time (e.g., above 5.0 MPa), the internal contacts of pressure switch D1 open, so that the 12V power supply no longer enters the power input terminal of solenoid valve ADC3 through pressure switch D1. Solenoid valve ADC3 is de-energized and the valve core closes. The compressed air output from the air compressor's storage tank no longer enters the oil tank 51, and no longer pressurizes the liquid fuel (e.g., diesel) in the oil tank. Through the above, this new invention can maintain a constant pressure in the oil tank when using fuel oil as fuel, ensuring that the atomized fuel oil can be effectively burned at the front end of the burner after mixing with the air output from the blower.Specifically, when the operator adjusts the resistance value of the adjustable resistor RP1 (high or low), the signal voltage of the 12V voltage entering the voltmeter V and the electric proportional valve M after being divided by the adjustable resistor RP1 and the resistor R1 will change (a higher voltage signal indicates a larger number displayed on the voltmeter, representing a relatively larger amount of fuel entering the burner body, and vice versa). When the voltage is high, the valve core of the electric proportional valve M opens to a greater extent; when the voltage is low, the valve core of the electric proportional valve M opens to a smaller extent. In this way, the operator can remotely adjust the amount of fuel entering the burner body without being on-site, by combining the number displayed on the voltmeter V.

[0020] Figure 1 , 2 As shown in Figure 3, after the combustion efficiency detection circuit is powered on, the 12V power supply is stepped down and current limited by resistor R2 and enters the power input terminal of the light-emitting diode VL. The light-emitting diode VL is powered on and emits light, which shines on the light-receiving surface of the phototransistor Q1. When the burner body is fully combusted and the exhaust gas has high transparency, the light received by the light-receiving surface of the phototransistor Q1 is relatively strong and its emitter output voltage signal is relatively high. When the burner body is not fully combusted and the exhaust gas has low transparency, the light received by the light-receiving surface of the phototransistor Q1 is relatively weak and its emitter output voltage signal is relatively low. When the burner body is fully combusted and the exhaust gas has suitable transparency, the light received by the light-receiving surface of phototransistor Q1 is strong. As a result, the voltage signal output from the emitter of phototransistor Q1 is divided by resistors R4 and R5 and enters the base of transistor Q2, which is higher than 0.7V. Transistor Q2 conducts, and the collector outputs a low level that enters the negative power input terminal of relay J1. Relay J1 is energized and its control power input terminal and normally closed contact terminal are opened. Alarm B will not be energized and will not sound, indicating that the burner body itself is fully combusted. When combustion in the burner is incomplete or the exhaust gas transparency is unsuitable, the light received by the phototransistor Q1 is weak. Consequently, the voltage signal output from the emitter of Q1, divided by resistors R4 and R5, enters the base of transistor Q2, where it falls below 0.7V. Transistor Q2 is cut off, and its collector no longer outputs a low-level signal to the negative power input terminal of relay J1. Relay J1 is de-energized and no longer engages, closing its control power input terminal and normally closed contact. Alarm B is then energized and sounds, indicating incomplete combustion in the burner itself. Through this system, operators can easily switch between using natural gas and fuel oil via two solenoid valves using a simple power switch. They can also easily adjust the amount of fuel entering the burner, making the application more flexible and ensuring the normal operation of equipment using the burner as a heat source (it can switch to supply fuel to the burner when natural gas is cut off). Real-time monitoring of combustion efficiency is possible, and in cases of incomplete combustion (due to incomplete combustion of the exhaust gas and reduced transparency), the alarm promptly alerts operators to perform maintenance and adjustments, ensuring high combustion efficiency.

[0021] Those skilled in the art should understand that although this specification describes embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. Therefore, the scope of protection of this invention is defined by the claims.

Claims

1. A dual fuel burner comprising a burner body, a solenoid valve, a fuel oil atomizing device, an air compressor, characterized in that, The burner body is provided with a gas pipe, a first electromagnetic valve, a fuel oil atomizing device, a combustion efficiency detection circuit and a regulating circuit.

2. The dual fuel burner according to claim 1, characterized in that The valve core of the electromagnetic valve and the electromagnetic valve A is a normally closed structure.

3. The dual fuel burner of claim 1, wherein, The regulating circuit comprises an adjustable resistor and a resistor which are electrically connected, and a voltmeter.

4. The dual fuel burner of claim 1, wherein, The spray hole of the oil injection head is located at one side of the combustion head of the burner body.

5. The dual fuel burner of claim 1, wherein, The combustion efficiency detection circuit comprises resistors and a triode which are electrically connected, and an alarm, and is connected with the light emitting diode and the photo triode. The first resistor and the second resistor are connected with the positive power input end of the relay and the control power input end. The other end of the first resistor is connected with the positive electrode of the light emitting diode. The other end of the second resistor is connected with the collector of the photo triode. The emitter of the triode is connected with the other end of the fourth resistor, the negative power input end of the alarm and the negative power input end of the light emitting diode. The other end of the third resistor and the other end of the fourth resistor are connected with the base of the triode. The collector of the triode is connected with the negative power input end of the relay. The positive power input end of the alarm is connected with the normally closed contact end of the relay.

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