CN108386837B - Flameless burner control system, flameless low NOx burner and control method thereof - Google Patents
Flameless burner control system, flameless low NOx burner and control method thereof Download PDFInfo
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- CN108386837B CN108386837B CN201810398534.2A CN201810398534A CN108386837B CN 108386837 B CN108386837 B CN 108386837B CN 201810398534 A CN201810398534 A CN 201810398534A CN 108386837 B CN108386837 B CN 108386837B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 117
- 239000002737 fuel gas Substances 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims description 144
- 239000000446 fuel Substances 0.000 claims description 36
- 239000011148 porous material Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000035418 detection of UV Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
- F23N5/206—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electrical or electromechanical means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a flameless burner control system, a flameless low NOx burner and a control method thereof, wherein the control system takes an SCU460 ignition controller as a core, so that different actions of a plurality of sets of valves can be automatically controlled according to flameless combustion and flameless combustion temperature conditions, the automatic switching control of different working modes of flameless combustion and flameless combustion is realized, the manual switching is not needed, the operation is convenient, and the safety and reliability are realized; meanwhile, the burner using the system can control flameless combustion and flameless combustion through the SCU460 ignition controller, when the temperature of the burner is lower than the set temperature, the burner is ignited through the ignition electrode, and the detection electrode can detect the flame, so that the low-temperature combustion process is ensured to be stable and reliable; in the flameless combustion stage, when the furnace temperature is higher than the set temperature, the ignition electrode is not ignited, fuel gas and air are sprayed into the furnace for combustion, and high-speed airflow sprayed into the furnace can entrain surrounding smoke to participate in combustion, so that the local high temperature of flame is greatly reduced, and the NOx is rapidly reduced.
Description
Technical Field
The invention relates to the field of burners, in particular to a flameless burner control system and a flameless low NOx burner thereof.
Background
Flameless combustion, also known as MILD combustion, is a volumetric combustion or diffusion combustion, and is characterized by low reaction rate, localized heat release combustion, uniform heat flow distribution, low peak combustion temperature and low noise, and high combustion, compared with conventional combustion, results in a reaction in a large area, even in the whole furnace, and results in rapid reduction of pollutants such as NOx, CO, etc. when the flame front is small. After the technology is first developed in the actual 90 s, the technology is rapidly applied to the iron and steel and metallurgy industries of Germany, italy, japan, america, swedish, china and other countries, and the technology is known as one of the most promising novel combustion technologies in the 21 st century by the international combustion world because the technology integrates energy conservation, emission reduction and environmental protection.
Along with the increasing importance of China on environmental protection at present, people are gradually aware that the negative influence of NOx emission on human health and living environment is bigger and bigger both in Jin Shanyin mountains and in green water and blue mountains. As an industrial waste gas exhaust household, energy conservation and emission reduction of an industrial furnace become important links in the industrial furnace, and how to reduce the emission of harmful gases in the industrial furnace becomes a difficult problem.
Along with the increasing importance of China on environmental protection, the energy conservation and emission reduction of the industrial kiln become important links, and the problem of effectively utilizing the flameless combustion technology to reduce the emission of the industrial kiln becomes one, meanwhile, as the number of matched valves around the flameless combustion burner is large, if manual control is fully utilized, the production cost is greatly increased, so that a flameless combustion control mode which is easy to operate, stable and reliable is developed.
In addition, the conventional burner is generally adopted for heating the existing industrial kiln, most of the existing industrial kiln is not energy-saving due to no preheating system, and part of manufacturers use external heat exchangers for energy saving, so that the preheating temperature is generally 400-450 ℃, but because the conventional burner is limited by the burner structure, the conventional burner burns at the preheating air temperature, the generated NOx is extremely high, and therefore, how to economically and effectively reform the existing industrial kiln combustion system becomes a new research direction of the burner manufacturers.
Disclosure of Invention
In order to solve the problems, the invention provides a flameless burner control system and a flameless low NOx burner thereof, which realize the efficient and stable control of the flameless burner and reduce the emission of NOx to the maximum extent.
In order to achieve the above purpose, the technical scheme adopted by the invention is to provide a flameless burner control system, which comprises an ignition transformer, an ignition electrode, a detection electrode, an air electromagnetic valve, a first gas electromagnetic valve, a second gas electromagnetic valve and an SCU460 ignition controller, wherein the ignition electrode and the detection electrode are arranged at the mixing position of gas and air in the flameless burner, the air electromagnetic valve is arranged on an air pipe communicated with the flameless burner, the first gas electromagnetic valve is arranged on the first gas pipe communicated with the flameless burner, the first gas pipe is connected with a second gas pipe at two ends of the first gas electromagnetic valve in parallel, the second gas electromagnetic valve is arranged on the second gas pipe, and the gas control output end of the SCU460 ignition controller is respectively connected with the first gas electromagnetic valve and the second gas electromagnetic valve; the air control output end of the SCU460 ignition controller is connected with an air electromagnetic valve, the ignition control output end of the SCU460 ignition controller is connected with the input end of an ignition transformer, the output end of the ignition transformer is connected with an ignition electrode, and the flame detection signal input end of the SCU460 ignition controller is connected with a detection electrode.
Specifically, an air hand valve is also arranged on the air pipe, and the air hand valve is positioned at one output end of the air electromagnetic valve.
Specifically, a first gas hand valve is further arranged on the first gas pipe, and the first gas hand valve is positioned at one output end of the first gas electromagnetic valve; and the second gas pipe is also provided with a second gas hand valve, and the second gas hand valve is positioned at one output end of the second gas electromagnetic valve.
The air flow orifice plate is arranged on the re-air pipe and is positioned between the air solenoid valve and the air hand valve; the gas flow pore plate is arranged on the first gas pipe and is positioned at one output end of the first gas hand valve.
In order to achieve the above purpose, another technical scheme adopted by the invention is to provide a flameless low NOx burner, which comprises a hollow air shell, a gas shell, a combustion chamber and an air-fuel mixing head, wherein an air pipe, an ignition electrode and a detection electrode are respectively arranged at two ends of the air shell and communicated with the air shell; the air control output end of the SCU460 ignition controller is connected with an air electromagnetic valve, the ignition control output end of the SCU460 ignition controller is connected with the input end of an ignition transformer, the output end of the ignition transformer is connected with an ignition electrode, and the flame detection signal input end of the SCU460 ignition controller is connected with a detection electrode.
Specifically, the gas holes are distributed around the center of the air-fuel mixing head, the primary air holes are distributed around the gas holes, and the secondary air holes are distributed around the first air holes.
Specifically, the air shell inner surface is provided with a fibrous lining.
In order to achieve the above object, another technical scheme adopted by the present invention is to provide a control method of a flameless combustion low NOx burner, the control method comprises a flameless combustion control method and a flameless combustion control method,
the control steps of the flamed combustion are as follows:
s11, controlling the first gas electromagnetic valve to be opened and controlling the second gas electromagnetic valve to be closed by the gas control output end of the SCU460 ignition controller when the temperature in the furnace is lower than a set temperature value, controlling the air electromagnetic valve to be opened by the air control output end, enabling combustion air to enter the air shell from an air pipe, and enabling the combustion air to reach an air-fuel mixing head through a combustion chamber, wherein the combustion air passes through a primary air hole and a secondary air hole respectively;
s12, enabling the fuel gas to enter the air-fuel mixing head from the first fuel gas pipe, and mixing the fuel gas with air from the primary air hole and the secondary air hole through fuel gas holes on the air-fuel mixing head;
s13, an ignition control output end of the SCU460 ignition controller sends an ignition signal to an ignition transformer, and an ignition electrode is driven by the ignition transformer to discharge and ignite into flame to be sprayed into the furnace;
s14, detecting flame by the detecting electrode at the moment, and feeding back a current signal to a flame detection signal input end of the SCU460 ignition controller;
the control steps of flameless combustion are as follows:
s21, controlling an air electromagnetic valve to be opened in advance for 2-3 seconds by an SCU460 ignition controller through an air control output end, enabling combustion air to enter a combustion chamber from air to reach an air-fuel mixing head, and enabling the combustion air to pass through a primary air hole and a secondary air hole respectively;
s22, the SCU460 ignition controller controls the first gas electromagnetic valve to be closed through a gas control output end, the second gas electromagnetic valve is opened, and gas enters the second gas pipe from one end of the first gas pipe, then enters the first gas pipe from the other end of the second gas pipe, finally enters the air-fuel mixing head and passes through the gas hole 193;
s23, the ignition control output end of the SCU460 ignition controller controls the ignition transformer not to discharge, and fuel gas and air are sprayed into the furnace from the combustion chamber to form flameless combustion in the furnace
The invention has the beneficial effects that:
according to the invention, the SCU460 ignition controller is used as a core control system, the SCU460 ignition controller is integrated with ignition control, flame monitoring, gas valve control and air solenoid valve control, and is matched with the corresponding first gas solenoid valve, second gas solenoid valve, air solenoid valve and ignition transformer, so that different actions of a plurality of sets of valves can be automatically controlled according to flameless combustion and temperature conditions of flameless combustion, the automatic switching control of different working modes of flameless combustion and flameless combustion is realized, the manual switching is not needed, the operation is convenient, and the air and gas entering a combustion chamber are controlled by the SCU460 ignition controller, so that the automatic switching control is safe and reliable;
meanwhile, the flameless burner of the system can control flameless combustion and flameless combustion through the SCU460 ignition controller, when the temperature of the furnace is lower than the set temperature, the flameless burner is ignited through the ignition electrode, and the detection electrode can detect the flame in real time, so that the stability and reliability in low-temperature combustion are ensured; in the flameless combustion stage, when the furnace temperature is higher than the set temperature, the ignition electrode is not ignited, fuel gas and air are sprayed into the furnace for combustion, a complete flame surface cannot be seen at the moment, and high-speed airflow sprayed into the furnace can entrain surrounding smoke to participate in combustion, so that the local high temperature of the flame is greatly reduced, and the NOx is rapidly reduced; the air-fuel mixing head is provided with the primary air holes and the secondary air holes in circumferential distribution, so that air enters in a grading manner, combustion of the burner is more complete, the flue gas temperature is more uniform, and the emission of nitrogen oxides NOx is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a flameless burner control system;
FIG. 2 is a schematic diagram of the operation of the flameless burner control system in flamed combustion;
FIG. 3 is a schematic diagram of the operation of flameless combustion of a flameless burner control system;
FIG. 4 is a schematic diagram of a flameless low NOx burner;
FIG. 5 is a schematic structural view of an air-fuel mixing head;
FIG. 6 is a schematic diagram of the operation of flameless low NOx burner flame combustion;
FIG. 7 is a schematic diagram of the operation of flameless combustion of a flameless low NOx burner.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Referring to fig. 1, the invention relates to a flameless burner control system, which comprises an ignition transformer 1, an ignition electrode 2, a detection electrode 3, an air electromagnetic valve 4, a first gas electromagnetic valve 5, a second gas electromagnetic valve 6 and an SCU460 ignition controller 7, wherein the ignition electrode 2 and the detection electrode 3 are arranged at the mixing position of gas and air in the flameless burner, the air electromagnetic valve 4 is arranged on an air pipe 8 communicated with the flameless burner, the first gas electromagnetic valve 5 is arranged on a first gas pipe 91 communicated with the flameless burner, a second gas pipe 92 positioned at two ends of the first gas electromagnetic valve 5 is connected on the first gas pipe 91 in parallel, and the second gas electromagnetic valve 6 is arranged on the second gas pipe 92; the fuel gas control output end of the SCU460 ignition controller 7 is respectively connected with the first fuel gas electromagnetic valve 5 and the second fuel gas electromagnetic valve 6; the air control output end of the SCU460 ignition controller 7 is connected with the air electromagnetic valve 4, the ignition control output end of the SCU460 ignition controller 7 is connected with the input end of the ignition transformer 1, the output end of the ignition transformer 1 is connected with the ignition electrode 2, and the flame detection signal input end of the SCU460 ignition controller 7 is connected with the detection electrode 3.
Further, in order to facilitate the adjustment of the air quantity and the gas quantity entering the burner, an air hand valve 10 is arranged at one end of the air pipe 8, which is positioned at the output end of the air solenoid valve 4; the first gas pipe 91 is provided with a first gas hand valve 11 at one end of the output of the first gas electromagnetic valve 5; the second gas pipe 92 is provided with a second gas hand valve 12 at one end of the output of the second gas electromagnetic valve 6; meanwhile, an air flow orifice plate 13 is arranged on the air pipe 8, a gas flow orifice plate 14 is arranged on the first gas pipe 91, and the gas flow orifice plate 14 is positioned at one output end of the first gas hand valve 11; for metering the actual flow of air and gas into the burner.
In addition, still be equipped with gas maintenance hand valve 15, this valve is closed after the nozzle breaks down, and the nozzle of being convenient for overhauls, and gas maintenance valve 15 sets up again on first gas pipe 91, is located the front end with the junction of second gas pipe 92, blocks first gas pipe and second gas pipe gas.
Referring to fig. 4, a flameless low NOx burner is shown, which comprises a hollow air shell 16, a gas shell 17, a combustion chamber 18, an air-fuel mixing head 19, an air pipe 8, an ignition electrode 2 and a detection electrode 3, wherein the combustion chamber 18 and the gas shell 17 are respectively arranged at two ends of the air shell 16 through mounting flanges 20 and are communicated with each other, the air pipe 8 is arranged on the surface of the air shell 16 and is communicated with the air shell 16, the air-fuel mixing head 19 is fixedly arranged in the combustion chamber 18, a first air pipe 91, a second air pipe 92 and an SCU460 ignition controller 7 are further included, primary air holes 191, secondary air holes 192 and gas holes 193 are circumferentially distributed on the surface of the air-fuel mixing head 19, the first air pipe 91 is fixedly arranged on the reburning shell 17, and one end of the first air pipe 91 is fixedly arranged on the air-fuel mixing head 19 and is communicated with the gas holes 193, and the primary air holes 191 and the secondary air holes 192 are communicated with the air shell 16.
Referring to fig. 5, in order to make combustion more complete and effectively reduce NOx emission, the primary air holes 191, the secondary air holes 192 and the gas holes 193 on the air-fuel mixing head 19 are circumferentially distributed, wherein the gas holes 193 are located at the center of the air-fuel mixing head 19, and the primary air holes 191 surround the gas holes 193, so that the primary air can surround the gas and be fully mixed; the secondary air holes 192 surround the primary air holes 191, that is, the secondary air entering from the secondary air holes 192 surrounds the mixed gas of the primary air and the fuel gas, and the structure of the air classification supply is adopted, so that the emission of NOx is effectively reduced in the combustion process.
In addition, the air shell 16 is prevented from overheating, and the air shell 16 is internally provided with a fiber lining, so that the air shell 16 can be effectively protected, and the overheated air is prevented from damaging the air shell 16.
The specific manner of flame combustion and flameless combustion is described below. It should be noted that, in this embodiment, the industrial furnace is provided with a thermocouple in the furnace, the actual temperature in the furnace is measured according to the thermocouple in the furnace, the thermocouple is connected with the temperature input end of the SCU460 ignition controller 7, the measured temperature signal in the furnace is sent to the SCU460 ignition controller 7, and the SCU460 ignition controller 7 compares the temperature in the furnace with the previously set temperature to control the combustion mode of the burner.
As shown in fig. 2 and 6, when the temperature in the furnace is lower than the set temperature, the temperature is set to 850 ℃ in this embodiment, that is, the stage of flame combustion is entered, and the working process is as follows:
1) The fuel gas control output end of the SCU460 ignition controller 7 controls the first fuel gas electromagnetic valve 5 to be opened and the second fuel gas electromagnetic valve 6 to be closed respectively, the air electromagnetic valve 4 to be opened is controlled by the air control output end, combustion air enters the air shell 16 from the air pipe 8 and then reaches the air-fuel mixing head 19 through the combustion chamber 18, and the combustion air reaches the right end of the air-fuel mixing head 19 through the primary air hole 191 and the secondary air hole 192 respectively;
2) The fuel gas enters from the first fuel gas pipe 91, reaches the air-fuel mixing head 19, reaches the right end of the air-fuel mixing head 19 through the fuel gas holes 193 on the air-fuel mixing head 19, and is mixed with the air from the primary air holes 191 and the secondary air holes 192;
3) The ignition control output end of the SCU460 ignition controller 7 sends an ignition signal to the ignition transformer 1, the ignition transformer 1 drives the ignition electrode 2 to discharge at the air-fuel mixing head 19, the combustible mixture reaching the air-fuel mixing head 19 is ignited to form flame, the flame is sprayed into the furnace through the outlet at the right end of the combustion chamber 18, and the high-speed sprayed flame is sucked in smoke in the furnace to participate in combustion, so that the flame temperature can be effectively reduced, and the emission of NOx is reduced; and because the air classification technology that the primary air holes 191 surround the secondary air holes 192 is adopted at the air-fuel mixing head 19, the NOx emission of the burner is very low at low temperature.
4) The generated flame burns to the detection electrode 3, and at this time, the detection electrode 3 feeds back a current signal to the flame detection signal input end of the SCU460 ignition controller 7, and the SCU460 ignition controller 7 receives the detection current to indicate that the burner is on.
As shown in fig. 3 and 7, when the temperature in the furnace is higher than the set temperature, the temperature is set to 850 ℃ in this embodiment, that is, the stage of flameless combustion is entered, and the working process is as follows:
1) The SCU460 ignition controller 7 controls the air electromagnetic valve 4 to be opened in advance for 2-3 seconds through an air control output end, and the principle is as follows: because the temperature of the furnace exceeds 850 ℃, the temperature of the combustion chamber of the flameless combustion burner is also high and exceeds the ignition point of fuel gas, the fuel gas can be directly ignited when passing through and flameless combustion cannot be formed, and at the moment, air needs to be introduced in advance to properly reduce the temperature of the combustion chamber, so that the flameless combustion burner is convenient to form flameless combustion in the furnace;
2) Combustion air enters the combustion chamber 18 from the air pipe 8 to reach the air-fuel mixing head 19, and the combustion air reaches the right end of the air-fuel mixing head 19 through the primary air holes 191 and the secondary air holes 192 respectively;
3) The SCU460 ignition controller 7 controls the first gas electromagnetic valve 5 to be closed through a gas control output end, the second gas electromagnetic valve 6 is opened, and gas enters the second gas pipe 92 from one end of the first gas pipe 91, then enters the first gas pipe 91 from the other end of the second gas pipe 92, and finally enters the gas hole 193 of the air-fuel mixing head 19;
4) At the moment, the ignition control output end of the SCU460 ignition controller 7 controls the ignition transformer 1 not to discharge, and the ignition electrode 2 cannot strike fire in the burner; the fuel gas and air are sprayed from the combustion chamber 18 and are sprayed into the furnace through the outlet at the right end of the combustion chamber 18 at extremely high speed, and the high-speed sprayed fuel gas mixture forms flameless combustion in the furnace because the furnace temperature is high enough and is far higher than the ignition point of the fuel gas, and the sucked fuel gas is combusted in the whole furnace space while diluting the local oxygen concentration of the combustion air, so that the local high temperature during flame combustion is eliminated, the combustion temperature of the flame is reduced, the emission of NOx is reduced, and meanwhile, the temperature uniformity in the furnace is good;
5) The detection electrode 3 cannot be burnt due to the fact that flame is burnt in the furnace, the detection electrode 3 cannot feed back a current signal to the SCU460 ignition controller 7, but the SCU460 ignition controller 7 enters a high-temperature flameless combustion mode, the furnace temperature is far higher than the ignition point of fuel gas, at the moment, the SCU460 ignition controller defaults to burn, and the burner enters the flameless combustion mode.
Compared with the prior art, the invention has the following advantages:
at low temperature, when the furnace temperature is lower than 850 ℃, a normal flame combustion mode is adopted, and at the moment, because the furnace temperature is low, NOx generated by burning the burner is low, and the national emission standard is reached; at high temperature, flameless combustion is adopted when the furnace temperature is higher than 850 ℃, and at the moment, the emission can be lower than the national standard due to the adoption of the flameless combustion technology although the furnace temperature is higher.
The burner is ignited by adopting an electrode at a low temperature when the furnace temperature is lower than 850 ℃, and the detection of an optional electrode or the detection of UV (ultraviolet) can be performed, so that the stability and reliability in low-temperature combustion are ensured; at high temperature, the electrode does not strike fire when the furnace temperature is higher than 850 ℃, the burner is directly controlled by pulse, the fuel gas and the air are sprayed into the furnace for combustion, a complete flame surface cannot be seen at the moment, the high-speed airflow sprayed into the furnace can scratch the surrounding smoke to participate in combustion, the local high temperature of the flame is greatly reduced, NOx is rapidly reduced, and meanwhile, the airflow in the furnace can be effectively stirred due to high-frequency pulse, so that the uniformity of the furnace temperature is better.
The available combustion air preheating temperature of the flameless combustion low NOx burner can reach 450 ℃, and the energy is saved by 20-30% compared with the common flameless combustion low NOx burner. Meanwhile, because the air staged combustion technology is adopted at low temperature, the combustion of the burner is more complete, the flue gas temperature is more uniform, and the emission of nitrogen oxides NOx is greatly reduced; the flameless combustion technology is adopted at high temperature, the fuel gas and the air are sprayed into the furnace at high speed, a large amount of flue gas is sucked in the furnace and combusted while being mixed, the flue gas greatly dilutes the oxygen content in the combustion air, the flame combustion temperature can be effectively reduced, the formation of NOx can be greatly reduced, and the generation of NOx can be greatly reduced even at higher preheating temperature.
The above embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the design of the present invention.
Claims (8)
1. The flameless burner control system is characterized by comprising an ignition transformer, an ignition electrode, a detection electrode, an air electromagnetic valve, a first gas electromagnetic valve, a second gas electromagnetic valve and an SCU460 ignition controller, wherein the ignition electrode and the detection electrode are arranged at the mixing position of gas and air in the flameless burner, the air electromagnetic valve is arranged on an air pipe communicated with the flameless burner, the first gas electromagnetic valve is arranged on a first gas pipe communicated with the flameless burner, the first gas pipe is connected with a second gas pipe at two ends of the first gas electromagnetic valve in parallel, the second gas electromagnetic valve is arranged on the second gas pipe, and the gas control output end of the SCU460 ignition controller is respectively connected with the first gas electromagnetic valve and the second gas electromagnetic valve; the air control output end of the SCU460 ignition controller is connected with an air electromagnetic valve, the ignition control output end of the SCU460 ignition controller is connected with the input end of an ignition transformer, the output end of the ignition transformer is connected with an ignition electrode, and the flame detection signal input end of the SCU460 ignition controller is connected with a detection electrode.
2. The flameless burner control system of claim 1, wherein: the air pipe is also provided with an air hand valve, and the air hand valve is positioned at one output end of the air electromagnetic valve.
3. The flameless burner control system of claim 2, wherein: the first gas pipe is also provided with a first gas hand valve, and the first gas hand valve is positioned at one output end of the first gas electromagnetic valve; and the second gas pipe is also provided with a second gas hand valve, and the second gas hand valve is positioned at one output end of the second gas electromagnetic valve.
4. The flameless burner control system of claim 3, wherein: the air flow pore plate is arranged on the re-air pipe and is positioned between the air solenoid valve and the air hand valve; the gas flow pore plate is arranged on the first gas pipe and is positioned at one output end of the first gas hand valve.
5. A flameless low NOx burner using the flameless burner control system according to any one of claims 1-4, comprising a hollow air shell, a gas shell, a combustion chamber, an air-fuel mixing head, an air pipe, an ignition electrode and a detection electrode, wherein the combustion chamber and the gas shell are respectively arranged at two ends of the air shell and are communicated with each other, the air pipe is arranged on the surface of the air shell and is communicated with the air shell, the air-fuel mixing head is fixedly arranged in the combustion chamber, the flameless low NOx burner control system is characterized by further comprising a first gas pipe, a second gas pipe and an SCU460 ignition controller, primary air holes, secondary air holes and gas holes are circumferentially distributed on the surface of the air-fuel mixing head, one end of the first gas pipe is fixedly arranged on the air-fuel mixing head and is communicated with the gas holes, the primary air holes, the secondary air holes are communicated with the air shell, a first gas electromagnetic valve is arranged on the first gas pipe, a second gas pipe is connected with the first gas pipe in parallel, the first gas pipe is positioned at two ends of the first electromagnetic valve, the second gas electromagnetic valve is arranged on the second gas pipe, an air electromagnetic valve is arranged on the air pipe, and an ignition end of the ignition electrode 460 is arranged at the ignition end of the ignition electrode and the ignition electrode is respectively connected with the first electromagnetic valve; the air control output end of the SCU460 ignition controller is connected with an air electromagnetic valve, the ignition control output end of the SCU460 ignition controller is connected with the input end of an ignition transformer, the output end of the ignition transformer is connected with an ignition electrode, and the flame detection signal input end of the SCU460 ignition controller is connected with a detection electrode.
6. The flameless low NOx burner of claim 5 wherein the gas holes are circumferentially distributed about the center of the air-fuel mixing head, the primary air holes are circumferentially distributed about the gas holes, and the secondary air holes are circumferentially distributed about the first air holes.
7. A flameless low NOx burner according to claim 5 or 6, characterized in that: the inner surface of the air shell is provided with a fiber lining.
8. A control method of the flameless low NOx burner of claim 5, wherein:
the control method includes a flameless combustion control method and a flameless combustion control method, wherein,
the control steps of the flamed combustion are as follows:
s11, controlling the first gas electromagnetic valve to be opened and controlling the second gas electromagnetic valve to be closed by the gas control output end of the SCU460 ignition controller when the temperature in the furnace is lower than a set temperature value, controlling the air electromagnetic valve to be opened by the air control output end, enabling combustion air to enter the air shell from an air pipe, and enabling the combustion air to reach an air-fuel mixing head through a combustion chamber, wherein the combustion air passes through a primary air hole and a secondary air hole respectively;
s12, enabling the fuel gas to enter the air-fuel mixing head from the first fuel gas pipe, and mixing the fuel gas with air from the primary air hole and the secondary air hole through fuel gas holes on the air-fuel mixing head;
s13, an ignition control output end of the SCU460 ignition controller sends an ignition signal to an ignition transformer, and an ignition electrode is driven by the ignition transformer to discharge and ignite into flame to be sprayed into the furnace;
s14, detecting flame by the detecting electrode at the moment, and feeding back a current signal to a flame detection signal input end of the SCU460 ignition controller;
the control steps of flameless combustion are as follows:
s21, controlling an air electromagnetic valve to be opened in advance for 2-3 seconds by an SCU460 ignition controller through an air control output end, enabling combustion air to enter a combustion chamber from air to reach an air-fuel mixing head, and enabling the combustion air to pass through a primary air hole and a secondary air hole respectively;
s22, the SCU460 ignition controller controls the first gas electromagnetic valve to be closed through a gas control output end, the second gas electromagnetic valve is opened, and gas enters the second gas pipe from one end of the first gas pipe, then enters the first gas pipe from the other end of the second gas pipe, finally enters the air-fuel mixing head and passes through the gas hole 193;
and S23, controlling the ignition transformer not to discharge by the ignition control output end of the SCU460 ignition controller, and spraying fuel gas and air into the furnace from the combustion chamber to form flameless combustion in the furnace.
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| CN201810398534.2A CN108386837B (en) | 2018-04-28 | 2018-04-28 | Flameless burner control system, flameless low NOx burner and control method thereof |
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| CN108954400A (en) * | 2018-09-20 | 2018-12-07 | 四川尚吕家居科技有限公司 | A kind of gas furnace automatic constant-temperature burner |
| CN110296407A (en) * | 2019-05-10 | 2019-10-01 | 金字号（福建）燃烧设备有限公司 | A kind of Different Boiler Burner Control System |
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