CN219735317U - Novel low-nitrogen burner - Google Patents

Abstract

The novel low-nitrogen combustor comprises a combustor body, an electromagnetic valve, a manual valve, a negative pressure fan, a power module and a temperature transmitter; the control circuit is also provided; the shell outer end of air-blower installs the heating shell, and the heat pipe is installed to the natural gas pipe, and the heat pipe outside is installed the heat pipe shell, and the heat pipe lower extreme is connected with solenoid valve one end, and the solenoid valve other end is connected with first manual valve one end, and first manual valve other end and natural gas pipe connection, negative pressure fan establish ties between flue and heating shell, heat pipe shell, power module, control circuit install in the component box and with negative pressure fan, air-blower, solenoid valve electric connection. The utility model discloses because gas obtains the heating, can not reduce the temperature in the furnace like this, reduced the nitrogen oxide content in the exhaust waste gas as far as possible, can the power and the closed natural gas of very first time disconnection fan etc. when stopping burning because of various reasons in the furnace, saved the energy and reduced the probability that the accident takes place.

Description

Novel low-nitrogen burner

Technical Field

The utility model relates to the technical field of burner equipment, in particular to a novel low-nitrogen burner.

Background

The industrial burner is a device used for boiler and metal heat treatment. The general structure of the industrial burner comprises a fan, an igniter, a burner body and a combustion hearth, wherein the front end of the burner body is positioned in the hearth, an air outlet pipe and a natural gas pipeline of the fan are respectively connected with an air inlet pipe and a gas pipeline of the burner, in the application, the air blower blows air into the hearth and mixes natural gas and the like, the igniter ignites the fire (after an electric spark is generated by the igniter to ignite the gas, then the ignition is automatically stopped), and the gas burns in the hearth to provide a heat source for heated equipment.

Although the existing burner meets the heating requirement to a certain extent, a certain technical improvement room still exists due to the limitation of the structure. For example, patent numbers of China "201921431031.7" and patent names "low nitrogen burner" are issued to the patent entitled "square holes are formed in the side end parts of the low nitrogen burner", plugs are installed in the square holes, and visual transparent glass is arranged in the centers of the plugs. The above-mentioned patent is realized conveniently observing the combustion condition and conveniently cleaning the furnace, but receives the structure limited, like current other low nitrogen combustors, can't preheat combustion air and natural gas that gets into in the furnace, like this especially in cold winter of weather, the gas that gets into in the furnace can reduce the furnace combustion temperature because not get preheated, is unfavorable for improving combustion efficiency, and the nitrogen oxide content is relatively high in the insufficiently exhaust waste gas of relative burning, also relatively big to the adverse effect of atmosphere to the environment. In addition, the air source and the fan power supply cannot be automatically turned off after the combustion is stopped in the hearth for various reasons, so that when the worker is not on duty at the side of the hearth, electric energy and gas leakage waste can be brought after the situation happens, and the leaked gas also has the probability of causing the worker to be poisoned and explosion accidents. Based on the above, it is especially necessary to provide a burner which can utilize the exhaust waste heat of the exhausted waste gas to heat the air and gas temperature in the hearth, and can automatically turn off the fan power supply and turn off the natural gas after stopping burning in the hearth.

Disclosure of Invention

In order to overcome the defects of the prior industrial burner as described in the background due to the structure, the utility model provides the novel low-nitrogen burner which is based on the industrial burner body, can extract part of waste gas discharged by the burner body into air blown into a hearth by a fan and natural gas for heating under the combined action of mechanisms and circuits during working, improves the combustion efficiency, fully reduces the content of nitrogen oxides in the discharged waste gas as far as possible due to combustion, reduces the adverse effect on the environment as far as possible, can detect the combustion condition in the hearth in real time, can disconnect the power supply of the fan and the like and close the natural gas at the first time when the combustion is stopped due to various reasons in the hearth, saves energy and reduces the occurrence probability of accidents.

The technical scheme adopted for solving the technical problems is as follows:

the novel low-nitrogen combustor comprises a combustor body, an electromagnetic valve, a manual valve, a negative pressure fan, a power module and a temperature transmitter; the device is characterized by also comprising a control circuit; the outer end of the blower housing of the burner body is provided with a heating shell, and the upper end and the lower end of the heating shell are respectively provided with a first connecting pipe and a second connecting pipe; the natural gas pipe of the burner body is provided with a heat conduction pipe, the outer side of the heat conduction pipe is provided with a heat conduction shell, the lower end of the heat conduction shell is connected with one end of a solenoid valve, the other end of the solenoid valve is connected with one end of a first manual valve, and the other end of the first manual valve is connected with a natural gas pipeline; the upper part and the lower part of the heat conduction shell are provided with a third connecting pipe and a fourth connecting pipe, and the upper ends of the first connecting pipe and the third connecting pipe are connected in parallel; the lower ends of the second connecting pipe and the fourth connecting pipe are connected in parallel with the exhaust end of the negative pressure fan, the air inlet end of the negative pressure fan is connected with one end of a second manual valve, and the other end of the second manual valve is connected with an air inlet pipe; the temperature transmitter is arranged outside the hearth, the detection head of the temperature transmitter is positioned in the hearth, and the power module and the control circuit are arranged in the element box; the signal output end of the temperature transmitter is electrically connected with the signal input end of the control circuit, the control power output end of the control circuit is electrically connected with the power input ends of the negative pressure fan and the blower, and the trigger power output end of the control circuit is electrically connected with the power input end of the electromagnetic valve.

Further, the upper ends of the first connecting pipe and the third connecting pipe are connected in parallel with an exhaust pipe; the front end of the air inlet pipe is positioned in an exhaust flue of the hearth.

Further, the solenoid valve is a normally open spool.

Further, the control circuit comprises an NPN triode, a PNP triode, a thyristor, a resistor, a relay and a buzzer which are electrically connected; the first resistor one end is connected with the second resistor one end and the third resistor one end, the second resistor other end is connected with the first NPN triode base electrode, the first NPN triode collector is connected with the fifth resistor one end and the second NPN triode base electrode, the second NPN triode collector is connected with the PNP triode base electrode, the third resistor other end is connected with the first NPN triode emitter, the second NPN triode emitter, the relay negative power input end and the buzzer negative power input end, the PNP triode emitter is connected with the fifth resistor other end and the thyristor anode, the PNP triode collector is connected with the fourth resistor one end, the fourth resistor other end is connected with the thyristor control electrode, and the thyristor cathode is connected with the relay positive power input end.

Further, an insulating board is connected between the rotating shaft of the motor of the negative pressure fan and the impeller.

The utility model has the beneficial effects that: the utility model discloses based on the industry combustor body, have all functions of ordinary combustor. In the novel burner, the negative pressure fan can enable the exhaust gas extraction part containing heat to enter the heating shell and the heat conducting shell after the burner body is burnt and exhausted, and then is exhausted to the exhaust gas flue after heat is released, so that the heat can heat the air entering the blower and the natural gas entering the burner body, and the gas is heated, so that the temperature in the hearth can not be reduced, the corresponding better combustion effect can be obtained, the nitrogen oxide content in the exhausted exhaust gas is reduced as much as possible, and the adverse effect on the environment is reduced as much as possible; the utility model discloses under temperature transmitter effect, control circuit can real-time detection furnace combustion conditions, can disconnect the power and the closed natural gas of fan etc. in the furnace because of the power and the closed natural gas of various reasons when stopping burning, has saved the energy and has reduced the probability that the accident takes place. Based on the above, the utility model has good application prospect.

Drawings

The utility model will be further described with reference to the drawings and examples.

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 is a schematic view of a partial structure of the present utility model.

Fig. 3 is a circuit diagram of the present utility model.

Detailed Description

The novel low-nitrogen burner is shown in fig. 1, 2 and 3, and comprises a burner body 1, an electromagnetic valve DC, manual valves 21 and 22, a negative pressure fan M (1 KW), a power supply module A1 and a temperature transmitter A2, wherein the burner body is matched with an ignition gun 101 and a blower M1 (3 KW), the burner body 1 is arranged on the front outer side of a furnace chamber 3, the combustion head of the burner body is positioned in the furnace chamber 3, the blower M1 is arranged on the front outer side of the furnace chamber 3, the air outlet pipe of the blower M1 is connected with the air pipe of the burner body 1 through a pipeline, the ignition gun 101 is arranged on the front outer side of the furnace chamber 3, and the ignition head of the blower is positioned at the upper side end of the gun head of the combustion burner body 1 in the furnace chamber 3; also has a control circuit 4; the front end of the outer side of the blower M1 is positioned at one side end of the air inlet, a hollow annular heating shell 5 is welded at the side end of the air inlet (the air inlet is positioned at the inner side of the inner ring of the heating shell 5, and a heat insulation plate can be arranged between the motor of the blower and the connecting part of the blower shell, so that the temperature of heat in the heating shell 5 acts on the temperature of the motor of the blower at the other side opposite to the air inlet of the blower and is not higher than 40 ℃, the heat of waste gas can not affect the normal operation of the motor of the blower), and a first connecting pipe 51 and a second connecting pipe 52 which are communicated with the inside of the heating shell are respectively welded at the upper end and the lower end of the heating shell 5; a snake-shaped heat conducting pipe 7 communicated with the inside of the natural gas pipe is welded below the natural gas pipe 6 of the burner body, a hollow rectangular heat conducting shell 8 is welded on the outer side of the heat conducting pipe 7 in a sealing manner, the upper end of the heat conducting pipe 7 is positioned outside the middle part of the upper end of the heat conducting shell 8 in a sealing manner, the lower end of the heat conducting pipe 7 is positioned outside the middle part of the lower end of the heat conducting shell in a sealing manner, the lower end of the heat conducting pipe 7 is connected with one end of an electromagnetic valve DC through threads, the other end of the electromagnetic valve DC is connected with one end of a first manual valve 21 through a pipeline joint, and the other end of the first manual valve 21 is connected with the natural gas pipe through a pipeline joint; a third connecting pipe 81 and a fourth connecting pipe 82 which are communicated with the inside of the heat conducting shell 8 are respectively welded at the upper part of the left end and the lower part of the left end of the heat conducting shell, and the upper ends of the first connecting pipe 51 and the third connecting pipe 81 are respectively connected with the two ends of a three-way pipe through threads; the two ends of the second connecting pipe 52, the fourth connecting pipe 82 and a three-way pipe A are respectively connected through threads, the third end of the three-way pipe A is connected with the exhaust pipe of the negative pressure fan M through a pipeline joint, the air inlet pipe of the negative pressure fan M is connected with one end of the second manual valve 22 through threads, and the other end of the second manual valve 22 is connected with an air inlet pipe 9; the temperature transmitter A2 is arranged at the front end of the hearth 3, the detection head of the temperature transmitter A2 is positioned in the hearth 3 (a shell of the temperature transmitter A2 is sealed with a mounting hole of the hearth 3), the power module A1 and the control circuit 4 are arranged on a circuit board in the element box 10, and the element box 10 is arranged in an electric box of the fan M1.

The third end of the three-way pipe is connected with an exhaust pipe 11, and the upper end of the exhaust pipe 11 is positioned in an exhaust flue (not shown in the figures) of the burner body hearth 3 (the exhaust pipe mounting hole between the outer side of the exhaust pipe 11 and the flue is sealed); the front end of the air inlet pipe 9 is positioned in the exhaust gas flue of the burner body hearth 3 and positioned at the lower end of the exhaust gas pipe 11 (the air inlet pipe 9 mounting hole between the outer side of the air inlet pipe and the flue is sealed). The electromagnetic valve DC is a normally open valve core and has power of 2W; the power supply module A1 is a finished product of a 220V-to-DC 12V switching power supply module with the model of 220V/12V/1 KW. The control circuit comprises power switches SK1 and SK3, NPN triodes Q1 and Q3, a PNP triode Q2, a thyristor VS1, resistors R1, R2, R3, R4 and R5, a relay K2 and a buzzer B which are connected through circuit board wiring; the first resistor R1 is connected with one end of the second resistor R3 and one end of the third resistor R2, the other end of the second resistor R3 is connected with the base electrode of the first NPN triode Q1, the collector electrode of the first NPN triode Q1 is connected with one end of the fifth resistor R5 and the base electrode of the second NPN triode Q3, the collector electrode of the second NPN triode Q3 is connected with the base electrode of the PNP triode Q2, the other end of the third resistor R2 is connected with the emitter electrode of the first NPN triode Q1, the emitter electrode of the second NPN triode Q3, the negative power input end of the relay K2 and the negative power input end of the buzzer B, the emitter electrode of the PNP triode Q2 is connected with one end of the first power switch SK1 and the other end of the fifth resistor R5, the other end of the first power switch SK1 is connected with the anode of the thyristor VS1, the collector electrode of the PNP triode Q2 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with the control electrode of the thyristor VS1, the cathode of the thyristor VS1 is connected with the positive power input end of the relay K2, the buzzer B2 is connected with the positive power input end of the relay K2 and the third power input end of the control relay K2 is connected with the third power input end of the power switch SK 3. The negative pressure fan comprises a motor M, a metal sealing volute 12, a connecting plate 13, a base plate 14 and an impeller 15, wherein the motor M and the volute 12 are respectively arranged at the right end and the left end of the base plate 14, a bearing seat 15 is arranged outside the middle part of the right side end of the volute 12, a shaft rod 17 is tightly sleeved in the bearing inner ring of the bearing seat 15, a flange plate at the right side end of the shaft rod 17 and a flange plate at the left end of a rotating shaft of the motor M are connected together through screw nuts, a circular insulating plate 18 is arranged between the two flange plates (the heat of exhaust gas entering the volute is isolated, the heat of the motor M is reduced, in practical application, the heat of the motor M is lower than 40 ℃, so the heat of the exhaust gas can not affect the normal operation of the motor), and the impeller 15 is tightly sleeved at the left side end of the shaft rod and is positioned in the volute 12 (an exhaust pipe and an air inlet pipe which are respectively communicated with the upper end and the left end of the volute are welded). The heat insulation board used by the motor of the blower and the negative pressure blower is a heat-resistant engineering plastic board. The power input ends 1 and 2 pins of the power module A1 and the two poles of an alternating current 220V power supply are respectively connected through wires, the power output end 3 pin of the power module A1 is connected in series through a power switch SK2, the power input ends 1 and 2 pins of the temperature transmitter A2, the power input ends PNP triode Q2 emitter and NPN triode Q1 emitter of the control circuit are respectively connected through wires, the signal output end 3 pin of the temperature transmitter A2 and the other end of the signal input end resistor R1 of the control circuit are respectively connected through wires, the 380V alternating current power supply is respectively connected with the three control power input ends of the power switch SK3 of the control circuit through wires, the three normally closed contact ends of the control power output end relay K2 of the control circuit are respectively connected with the negative pressure fan M and the power input ends of the blower M1 through wires, and the trigger power output end thyristor VS1 cathode of the control circuit, the NPN triode Q1 emitter and the power input ends of the electromagnetic valve DC are respectively connected through wires. The handles of all the power switches are located outside the front opening of the element box 10.

The present utility model, based on an industrial burner body 1, has all the functions of a common burner, as shown in figures 1, 2 and 3; in application, the blower M1 mixes air (entering the furnace through the outer cylinder of the burner body) and natural gas (entering the inner cylinder of the burner body through the natural gas pipe 6 and burning after the burner body is located at the inner part of the furnace) in the furnace 3, and the like, after the igniter 101 (the ignition gun) ignites the fire (after the ignition gun 101 generates electric spark to ignite the fuel gas, then the ignition is automatically stopped), the fuel gas burns in the furnace 3 to provide a heat source for the heated equipment (after burning, the waste gas is discharged through the flue). In the utility model, after 220V AC power enters the power input end of the power module A1, the 3 and 4 pins of the power module A1 output stable DC12V power and enter the power input end of the control circuit and the temperature transmitter A2 (under the premise that the power switch SK1 is opened). After the power switch SK3 is turned on, a 380V power supply enters the power input end of the blower M1 and the power input end of the negative pressure blower M through the control power input end and the normally closed contact end of the relay K2, so that the blower M1 normally gets into working to blow external air into the burner body 1, and meanwhile, the air is mixed with natural gas entering through the natural gas pipe 6 to enter a hearth for combustion (the opening and closing degree of a valve core of the valve 21 is adjusted, and the natural gas entering the burner body 1 can be adjusted to be different in size). After the negative pressure fan M is powered on, exhaust gas discharged to a flue after combustion of a hearth is pumped out through an air inlet pipe 9 and enters a heating shell 5 and a heat conducting shell 8 (the exhaust gas enters the heating shell 5 and the heat conducting shell 8 respectively through a second connecting pipe 52 and a fourth connecting pipe 84), heat of the heating shell 5 heats one side of the fan M1 and acts on air entering the fan, heat of the heat conducting shell 8 acts on natural gas, and thus the air and the natural gas are heated and enter a combustor body for combustion; because the gas is heated (about 60 ℃), the gas does not reduce the temperature in the hearth, correspondingly better combustion effect can be obtained, the content of nitrogen oxides in the discharged waste gas is reduced as much as possible, and adverse effects on the environment are reduced as much as possible (the flow of waste gas entering the heating shell 5 and the heat conducting shell 8 can be adjusted by adjusting the opening and closing size of the valve core of the valve 22, and the higher the flow is, the higher the heat is, and the lower the flow is conversely). The exhaust gas after heat release is discharged into the flue through the first connecting pipe 51, the third connecting pipe 81 and the exhaust gas pipe 11.

After the temperature transmitter A2 is powered on and works, the 3 pin of the temperature transmitter A2 outputs a dynamically-changed voltage signal to enter the other end of the resistor R1 along with the detected temperature change in the hearth, and the higher the temperature is, the higher the output voltage signal is, and conversely, the lower the output voltage signal is; when the burner body 1 burns normally and the temperature in the hearth is higher than about 900 ℃ (the detected temperature is set relatively high to prevent residual temperature in the hearth, a subsequent circuit cannot respond timely after the burner body is flameout), voltage signals output by the 3 feet of the temperature transmitter A2 are divided by the resistors R1 and R2, the voltage is reduced and limited by the resistor R3 and then enter the base electrode of the NPN triode Q1 to be higher than 0.7V, the conduction collector output low level of the NPN triode Q1 enters the base electrode of the NPN triode Q3, the NPN triode Q3 is cut off, the relay K2 at the later stage cannot be powered, and the blower M1, the negative pressure blower M, the electromagnetic valve DC and the like keep the current working state. When the combustion of the burner body 1 is abnormally extinguished (for example, natural gas suddenly becomes smaller and is insufficient to maintain combustion, and then the operator does not timely ignite the burner by an ignition gun after the burner body is recovered to be normal), and the temperature in a hearth is lower than about 900 ℃, a voltage signal output by a 3 pin of the temperature transmitter A2 is divided by resistors R1 and R2, the voltage is reduced and limited by the resistor R3, then the voltage enters a base electrode of the NPN triode Q1 to be lower than 0.7V, a cut-off collector of the NPN triode Q1 does not output a low level and enters a base electrode of the NPN triode Q3, the NPN triode Q3 obtains proper normal bias voltage to conduct the collector output low level to enter a base electrode of the PNP triode Q2 through the current limiting and voltage reducing of the resistor R4, the high level of the collector output high level of the PNP triode Q2 is conducted by the current limiting and voltage reducing trigger thyristor VS1, and then relay K2 gets electricity to close its control power input end and normally closed contact end open circuit (air-blower M1 and negative pressure fan M all lose electricity and no longer work), solenoid valve DC gets its inside case of electricity to close simultaneously, and is synchronous, buzzer B gets electricity sound to indicate that staff who is not on the scene burner body 1 has stopped burning, in time find out the reason, prevent personnel's poisoning, explosion accident and energy waste (this novel before the next time use and before each time primary use, need close switch SK1, the conduction state of release thyristor VS1, etc. turn on switch SK1 again after the furnace temperature is normal, prevent that furnace temperature is not enough thyristor VS1 false triggering switch on, cause equipment unable normal work). This novel extension uses, also can set up square hole and glass installation in the side tip of low nitrogen combustor body when necessary and be convenient for observe combustion conditions and be convenient for clean etc.. As shown in fig. 3, the solenoid valve DC1 is a normally open spool solenoid valve with an operating voltage of 12V and a power of 2W; the temperature transmitter A2 is a finished product of a rhodium thermocouple temperature transmitter with the model SBWRP2-230, detects the temperature of 1600 ℃, and is provided with two power lines 1 and 2 pins and a signal output line 3 pin, when the temperature transmitter A2 works, the front end detector head is different in detected temperature, and the signal output line 3 pin can output voltage signals with the change of 0-10V; the power supply module A1 is a finished product of a 220V/12V/1KW alternating current 220V-12V direct current switch power supply module, and the power is 200W. Model number Q1 and Q3 of NPN triode is 9013; the model Q2 of the PNP triode is 9012; the resistances of the resistors R1, R2, R3, R4 and R5 are respectively 200K, 32.1K, 47K, 100K and 200K; the relay K2 is a DC12V direct current relay; the thyristor VS1 is a plastic package unidirectional silicon controlled rectifier with the model MCR 100-1; the buzzer B is an active continuous sound buzzer alarm finished product with the model MF 12V.

It should be understood by those skilled in the art that although the present disclosure describes embodiments, the embodiments do not include only a single embodiment, and the description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the embodiments in the examples may be combined appropriately to form other embodiments that can be understood by those skilled in the art, so that the scope of the present disclosure is defined by the claims.

Claims (5)

1. The novel low-nitrogen combustor comprises a combustor body, an electromagnetic valve, a manual valve, a negative pressure fan, a power module and a temperature transmitter; the device is characterized by also comprising a control circuit; the outer end of the blower housing of the burner body is provided with a heating shell, and the upper end and the lower end of the heating shell are respectively provided with a first connecting pipe and a second connecting pipe; the natural gas pipe of the burner body is provided with a heat conduction pipe, the outer side of the heat conduction pipe is provided with a heat conduction shell, the lower end of the heat conduction shell is connected with one end of a solenoid valve, the other end of the solenoid valve is connected with one end of a first manual valve, and the other end of the first manual valve is connected with a natural gas pipeline; the upper part and the lower part of the heat conduction shell are provided with a third connecting pipe and a fourth connecting pipe, and the upper ends of the first connecting pipe and the third connecting pipe are connected in parallel; the lower ends of the second connecting pipe and the fourth connecting pipe are connected in parallel with the exhaust end of the negative pressure fan, the air inlet end of the negative pressure fan is connected with one end of a second manual valve, and the other end of the second manual valve is connected with an air inlet pipe; the temperature transmitter is arranged outside the hearth, the detection head of the temperature transmitter is positioned in the hearth, and the power module and the control circuit are arranged in the element box; the signal output end of the temperature transmitter is electrically connected with the signal input end of the control circuit, the control power output end of the control circuit is electrically connected with the power input ends of the negative pressure fan and the blower, and the trigger power output end of the control circuit is electrically connected with the power input end of the electromagnetic valve.

2. The novel low nitrogen burner according to claim 1, wherein the upper ends of the first connecting pipe and the third connecting pipe are connected in parallel with an exhaust pipe; the front end of the air inlet pipe is positioned in an exhaust flue of the hearth.

3. The novel low nitrogen burner of claim 1, wherein the solenoid valve is a normally open spool.

4. The novel low-nitrogen burner of claim 1, wherein the control circuit comprises an NPN triode, a PNP triode, a thyristor, a resistor, a relay, and a buzzer that are electrically connected; the first resistor one end is connected with the second resistor one end and the third resistor one end, the second resistor other end is connected with the first NPN triode base electrode, the first NPN triode collector is connected with the fifth resistor one end and the second NPN triode base electrode, the second NPN triode collector is connected with the PNP triode base electrode, the third resistor other end is connected with the first NPN triode emitter, the second NPN triode emitter, the relay negative power input end and the buzzer negative power input end, the PNP triode emitter is connected with the fifth resistor other end and the thyristor anode, the PNP triode collector is connected with the fourth resistor one end, the fourth resistor other end is connected with the thyristor control electrode, and the thyristor cathode is connected with the relay positive power input end.

5. The novel low nitrogen burner of claim 1, wherein an insulating plate is connected between the rotating shaft of the motor of the negative pressure fan and the impeller.