CN106594716B - A kind of cigarette wind premix restrains self cooling but low nitrogen combustion apparatus and its combustion method - Google Patents

A kind of cigarette wind premix restrains self cooling but low nitrogen combustion apparatus and its combustion method Download PDF

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Publication number
CN106594716B
CN106594716B CN201611100612.3A CN201611100612A CN106594716B CN 106594716 B CN106594716 B CN 106594716B CN 201611100612 A CN201611100612 A CN 201611100612A CN 106594716 B CN106594716 B CN 106594716B
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gas
cigarette wind
combustion
valve
pipeline
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CN201611100612.3A
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Chinese (zh)
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CN106594716A (en
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王立臣
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王立臣
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/08Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F23D14/24Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/02Regulating fuel supply conjointly with air supply
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2202/00Fluegas recirculation
    • F23C2202/30Premixing fluegas with combustion air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2900/00Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14Special features of gas burners
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2221/00Pretreatment or prehandling
    • F23N2221/12Recycling exhaust gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00Fuels
    • F23N2239/04Gaseous fuels

Abstract

The invention discloses a kind of cigarette wind premixs to restrain self cooling but low nitrogen combustion apparatus and its combustion method, is equipped with fuel gas pipeline, air blower, cigarette wind premix and restrains self cooling but low NO;Blower inlet is connected with cigarette wind mixer, and blower export is connected with cigarette wind gas mixing pipe road, and cigarette wind is connected in cigarette wind gas mixing pipe road and mixes gas injection device;Low NO is equipped with windband, and main exhaust gas nozzle is equipped in windband, and a circle cigarette wind is equipped with around main exhaust gas nozzle and mixes air cooling tube bank, cigarette wind, which mixes air cooling tube bank, directly to be goed deep into burner hearth;Burner is equipped with burning torch;It is equipped with cigarette wind in windband and mixes gas import;Main exhaust gas nozzle rear end is connected to the high fire fuel gas pipeline for being equipped with high fire valve with the small fire fuel gas pipeline equipped with small fire valve respectively;Burning torch end is equipped with flame detector.The device is suitable for gas fired-boiler, has the features such as simple structure and reasonable design, flame low temperature low nitrogen burning, device is cooled down automatically, is precisely controlled, it is ensured that the nitrogen oxide emission of gas fired-boiler is extremely low.

Description

A kind of cigarette wind premix restrains self cooling but low nitrogen combustion apparatus and its combustion method

Technical field

The present invention relates to gas fired-boiler low-NO_x combustion technology fields more particularly to a kind of cigarette wind premix to restrain self cooling low nitrogen Burner and its combustion method.

Background technique

The nitrogen oxides generated in fuel combustion process is mainly NO and a small amount of NO2, and the two is referred to as NOx.Combustion gas NO accounts for about 90% in the nitrogen oxides generated during burning, remaining is NO2.Nitrogen oxides be to be formed photochemical fog and One major reason of acid rain.

The conditions such as the production quantity and discharge amount of NOx and ignition temperature, excess air coefficient are related.In various combustion processes There are three types of the generation dominant mechanisms of NOx, is thermal NO x, transient response type NOx and fuel type NOx respectively.It is generated according to NOx Mechanism, the factor for influencing NOx generation amount mainly have flame temperature, combustor section oxygen concentration, combustion product to stop in high-temperature region The characteristic of time and fuel, general flame temperature is higher, and the generation of NOx is more, and vice versa.And reduce oxynitrides generation The approach of amount mainly controls flame temperature, prevents localized hyperthermia.

China's most area is influenced by haze is different degrees of in recent years, in all parts of the country all to administer mist making great efforts Haze.Formally put into effect on July 1st, 2015 new in pot Beijing《Emission standard of air pollutants for boilers》Newly constructed boiler discharges nitrogen oxygen Compound has to be lower than 30 milligrams/cubic metre.There is air excess systems for existing boiler combustion machine structure type and control mode The problems such as number is big, and local flame temperature is high, so that discharged nitrous oxides are exceeded, therefore, designs reasonable burner structure, precisely Controlling ignition temperature is the key that gas fired-boiler low nitrogen burning.

Summary of the invention

For deficiency existing for existing gas fired-boiler combustor, it is an object of the invention to:A kind of cigarette wind premix barrel is provided For beam from cooling low nitrogen combustion apparatus and its combustion method, which has simple structure and reasonable design, low nitrogen burning, precisely control The features such as processed, it is ensured that the nitrogen oxide emission of gas fired-boiler is extremely low.

In order to achieve the above object, the present invention adopts the following technical scheme that realization:

A kind of self cooling but low nitrogen combustion apparatus of cigarette wind premix tube bank, it is characterised in that:Equipped with fuel gas pipeline, air blower, cigarette Wind premix restrains self cooling but low NO;Blower inlet is connected with cigarette wind mixer, and blower export is connected with cigarette wind and mixes gas Pipeline is connected with cigarette wind in cigarette wind gas mixing pipe road and mixes gas injection device;The low NO is equipped with windband, is equipped with main combustion in windband Gas blowout pipe, the main exhaust gas nozzle pass through the ring flange of windband rear end, are fixed among windband, are equipped with position in its front end periphery Adjustable spinning disk is set, a circle cigarette wind is equipped with around main exhaust gas nozzle in windband and mixes air cooling tube bank, the cigarette wind gas mixing pipe beam It is uniformly arranged and fixed and the periphery of main exhaust gas nozzle is set, gas phase is mixed with the cigarette wind entered in windband in windband in port thereafter Logical, front end is protruded into boiler furnace;It is equipped with cigarette wind in windband and mixes gas import, which mixes gas import and be arranged under windband Side;The main exhaust gas nozzle rear end is stretched out outside windband ring flange, is connected to respectively with high fire fuel gas pipeline and small fire fuel gas pipeline, Valve and valve are respectively equipped on high fire fuel gas pipeline and small fire fuel gas pipeline;Cigarette wind premix is restrained on self cooling but low NO It is additionally provided with burning torch, the outside of cigarette wind gas mixing pipe beam is arranged in burning torch;Windband ring flange is also stretched out in the rear end of the burning torch Outside is set on burning torch there are three interface, is separately connected spark plug interface, is lighted a fire and fuel gas pipeline and is mixed gas by the cigarette wind in windband The igniting combustion supporting air piping that import is drawn is respectively equipped with valve and valve in fuel gas pipeline and the igniting combustion supporting air piping of lighting a fire, point Firelock end is equipped with flame detector.

The present invention further improves and the additional project of implementation is:

The blower inlet connects cigarette wind mixer, which is equipped with air intlet and gas inlet, empty Gas import is communicated with atmosphere, and gas inlet connects the smoke backflow pipeline that the flue of boiler is drawn, the connection of cigarette wind mixer outlet Cigarette wind gas mixing pipe road;The smoke regulating valve for adjusting flue gas flow is equipped on the smoke backflow pipeline;In the smoke backflow The minimum point of pipeline and cigarette wind gas mixing pipe road is equipped with drain valve;The mixed gas of extraction cigarette wind is equipped in cigarette wind gas mixing pipe road to flow back into Flue, to adjust the mixed gas injection device of cigarette wind initial pressure, which is equipped with bleed valve;The air blower is equipped with Air blower control cabinet.

The high fire fuel gas pipeline, small fire fuel gas pipeline, igniting fuel gas pipeline are connected to the main combustible pipe road of setting respectively, Main combustible pipe road is equipped with manual modulation valve, double cutting solenoid valves and gaseous-pressure switch.

The high fire valve, small fire valve, igniting burnt gas valve, double cutting solenoid valves are controllable electromagnetic valve, flue gas Regulating valve is electric control valve, and the air blower sets frequency-variable controller, the electromagnetic valve, frequency-variable controller, flame sensor difference Switch control connection is carried out with the PLC controller of setting, PLC controller is equipped with operation panel.

Flow sensor and pressure sensor are equipped on the main combustible pipe road and smoke backflow pipeline;It is set in burner hearth There is flame sensor, temperature sensor is equipped on flue, the flow sensor, pressure sensor and temperature sensor are distinguished Signal transmission is carried out with the PLC controller to connect, and data memory module and data analysis module are equipped in PLC controller, Are carried out by timing monitoring and data record storage, and is analyzed for the pressure of each pipeline, flow, when discovery wherein has pipeline or furnace Thorax operation issues alarm signal when abnormal, when burner hearth is without flame, when gaseous-pressure, flue gas pressures are lower than setting value, is reporting Fuel gas pipeline, cigarette wind gas mixing pipe road and air blower are immediately closed off while alert.

The combustion method of above-mentioned low nitrogen combustion apparatus has following steps:

1) it is switched on:PLC controller, operation panel and air blower control cabinet power on, and setting combustion gas, cigarette wind mix the normal pressure of gas Burner operation is set to igniting operation on operation panel in 10-20kPa by value, it is ensured that smoke regulating valve is closed, starting Air blower operation;

2) fuel gas pipeline and cigarette wind gas mixing pipe road are opened:Regulating gas pressure 10-20kPa is opened and is set on combustion gas main pipeline The manual modulation valve set, combustion gas enter in combustion gas main pipeline;Open the smoke regulating valve and air blower on smoke backflow pipe, cigarette Wind gas mixing pipe road is opened, and cigarette wind mixes gas and enters windband;

3) starting ignition process:Gas ignition branch road igniting gas electromagnetic valve is opened, igniting fuel gas pipeline is passed through combustion gas, Igniting mixed pneumoelectric magnet valv is opened, burning torch, burning torch operation are lighted in ignition transformer sparking;

4) ignition process success:After burning torch operation, PLC controller opens small fire gas electromagnetic valve;Combustion gas, mixed gas enter Windband and bundled tube combustion head, burning torch light small fire and are considered as and light a fire successfully after Fike detector detects small fire operation, igniting Process terminates, and is transferred to step 6);

5) loss of ignition:Small fire run signal is not detected in Fike detector in ignition process, that is, is considered as loss of ignition;PLC All solenoid valves are closed in controller control, cut off natural gas supply, and start alarm equipment alarm;Air blower purges burner hearth 5 minutes, Then return step 3), restart igniting process;

6) it operates normally:It after lighting a fire successfully, is run 10-20 minutes in small fire gear, high fire combustion is opened by operation panel Burner operation is set to high fire gear by pneumoelectric magnet valve, and smoke regulating valve is opened, while being opened cigarette wind and being mixed on gas injection pipeline Bleed valve, burner enters normal operation;

7) parking step:

(1) orderly shutdown:

Flame-out button is clicked on operation panel, PLC controller controls automatic self-closing gas pipeline solenoid, and carries out The operation for stopping air blower after furnace purge operation, realizes orderly shutdown;

(2) scram:

When low nitrogen combustion apparatus in the process of running, gaseous-pressure, cigarette wind initial pressure below or above setting value or When burning torch fire extinguishing, main fray-out of flame, gas leakage, the automatic starting alarm equipment alarm of PLC controller control, and be automatically closed each Solenoid valve cuts off fuel gas pipeline, closes air blower, stops burner operation, and purged, realizes safely scram.

The mechanism of reduction discharged nitrous oxides of the invention:The cigarette wind gas mixing pipe being arranged in the windband of this low nitrogen combustion apparatus Around Shu Zhu exhaust gas nozzle, since its front end is longer than main exhaust gas nozzle, and protrude into burner hearth, at combustion head formed one by Every the bundled tube combustion head that steel pipe surrounds, after natural gas mixes in bundled tube combustion head with cigarette wind gaseous mixture, by steel pipe gap Place is ejected in furnace chamber inner combustion, since cigarette wind mixes the incorporation of gas, the fuel value of combustion gas is reduced, to reduce the combustion of natural gas Burn temperature.And gaseous mixture burns on tube bank surface, and the low temperature cigarette wind mixed gas being in addition passed through in tube bank takes away burning When the tube bank surface heat that generates, further reduced in burner hearth the ignition temperature of combustion gas and tube bank surface flame temperature, significantly The generation of nitrogen oxides is reduced, while cooling protection is carried out to tube bank steel pipe.

Compared with boiler combustion device in the prior art, cigarette wind premix cigarette wind premix of the invention restrains self cooling low nitrogen combustion It burns device and its combustion method has the following advantages that:

(1) natural gas that the cigarette wind gaseous mixture in windband and natural air gun eject is in the combustion head cavity that tube bank surrounds Then mixing sprays into burner hearth by tube gap and is restraining surface full combustion, cigarette wind mixed gas drop is in addition passed through in tube bank Temperature restrains the heat that surface generates, reduces the combustion of natural gas when the mixed gas after heating enters burner hearth while taking away burning Temperature and surface flame temperature are burnt, greatly reduces the generation of nitrogen oxides, fundamentally controls the generation of nitrogen oxides, for Environment protection significance is great.

(2) backflow flue gas enters the quantity of heat convection that burner hearth improves boiler.

(3) frequency conversion air blower is arranged near furnace last row smoke pipe, and peripheral hardware cigarette wind mixer, reduces fan noise.

(4) structure is simple, and design is rationally, easy to operate, and especially automatic control degree is high.

(5) operation of the invention is full intellectualized, provided with complete control function and warning function, operating safety factor It is very high, it can sufficiently ensure the safety of production run.

Detailed description of the invention

Attached drawing 1 is overall structure diagram of the invention.

Attached drawing 2 is the structural schematic diagram of low NO of the invention.

Specific embodiment

The present invention is described further with reference to the accompanying drawing:

Embodiment:Refering to attached drawing 1,2, a kind of cigarette wind premix restrains self cooling but low nitrogen combustion apparatus and its combustion method, if There are fuel gas pipeline, air blower 2, cigarette wind premix to restrain self cooling but low NO 1;Blower inlet is connected with cigarette wind mixer 3, Blower export is connected with cigarette wind gas mixing pipe road 9, and cigarette wind is connected in cigarette wind gas mixing pipe road and mixes gas injection device 7;The low nitrogen burning Device is equipped with windband 34, and main exhaust gas nozzle 35 is equipped in windband, which passes through the ring flange of windband rear end, fixed setting Among windband, it is equipped with the adjustable spinning disk 29 in position in its front end periphery, is equipped with a circle around main exhaust gas nozzle in windband Cigarette wind mixes air cooling tube bank 28, which, which is uniformly arranged and fixed, is arranged in the periphery of main exhaust gas nozzle, thereafter port In windband, gas phase is mixed with the cigarette wind entered in windband and is led to, front end is protruded into 32 burner hearth of boiler;It is mixed that cigarette wind is equipped in windband Gas import 25, the cigarette wind mix the lower section that windband is arranged in gas import;The main exhaust gas nozzle rear end is stretched out outside windband ring flange 27 Face is connected to high fire fuel gas pipeline 12 and small fire fuel gas pipeline 22 respectively, on high fire fuel gas pipeline and small fire fuel gas pipeline respectively Equipped with valve 14 and valve 15;Cigarette wind premix restrains and is additionally provided with burning torch 26 on self cooling but low NO, and burning torch setting exists The outside of cigarette wind gas mixing pipe beam;The outside of windband ring flange 27 is also stretched out in the rear end of the burning torch, sets that there are three connect on burning torch Mouthful, it is separately connected spark plug interface 4, light a fire fuel gas pipeline 23 and the igniting combustion supporting wind by the mixed gas import extraction of cigarette wind in windband Pipeline 24 is respectively equipped with valve 16 and valve 11 in fuel gas pipeline and the igniting combustion supporting air piping of lighting a fire, and burning torch end is equipped with fire Flame detector.

The blower inlet connects cigarette wind mixer 3, which is equipped with air intlet and gas inlet, empty Gas import is communicated with atmosphere, and gas inlet connects the smoke backflow pipeline 10 that the flue 31 of boiler 32 is drawn, and cigarette wind mixer goes out Mouth connection cigarette wind gas mixing pipe road 9;The smoke regulating valve 6 for adjusting flue gas flow is equipped on the smoke backflow pipeline;Described The minimum point of smoke backflow pipeline and cigarette wind gas mixing pipe road is equipped with drain valve 5;It is equipped in cigarette wind gas mixing pipe road and draws cigarette wind Mixed gas flows back into flue 31, and to adjust the mixed gas injection device 7 of cigarette wind initial pressure, which is equipped with bleed valve 8; The air blower is equipped with air blower control cabinet.

The high fire fuel gas pipeline, small fire fuel gas pipeline, igniting fuel gas pipeline are connected to the main combustible pipe road of setting respectively, Main combustible pipe road is equipped with manual modulation valve 17, double cutting solenoid valves 13 and gaseous-pressure switch 21.The high fire valve, small fire Valve, igniting burnt gas valve, double cutting solenoid valves are controllable electromagnetic valve, and smoke regulating valve is electric control valve, the air blast Machine sets frequency-variable controller, and the electromagnetic valve, frequency-variable controller, flame sensor are switched with the PLC controller of setting respectively Control connection, PLC controller are equipped with operation panel.

Flow sensor and pressure sensor are equipped on the main combustible pipe road and smoke backflow pipeline;It is set in burner hearth There is flame sensor, temperature sensor is equipped on flue, the flow sensor, pressure sensor and temperature sensor are distinguished Signal transmission is carried out with the PLC controller to connect, and data memory module and data analysis module are equipped in PLC controller, Are carried out by timing monitoring and data record storage, and is analyzed for the pressure of each pipeline, flow, when discovery wherein has pipeline or furnace Thorax operation issues alarm signal when abnormal, when burner hearth is without flame, when gaseous-pressure, flue gas pressures are lower than setting value, is reporting Fuel gas pipeline, cigarette wind gas mixing pipe road and air blower are immediately closed off while alert.

The combustion method of above-mentioned low nitrogen combustion apparatus, uses following steps:

1) it is switched on:PLC controller, operation panel and air blower control cabinet power on, and setting combustion gas, cigarette wind mix the normal pressure of gas Burner operation is set to igniting operation on operation panel in 10-20kPa by value, it is ensured that smoke regulating valve is closed, starting Air blower operation;

2) fuel gas pipeline and cigarette wind gas mixing pipe road are opened:Regulating gas pressure 10-20kPa is opened and is set on combustion gas main pipeline The manual modulation valve set, combustion gas enter in combustion gas main pipeline;Open the smoke regulating valve and air blower on smoke backflow pipe, cigarette Wind gas mixing pipe road is opened, and cigarette wind mixes gas and enters windband;

3) starting ignition process:Gas ignition branch road igniting gas electromagnetic valve is opened, igniting fuel gas pipeline is passed through combustion gas, Igniting mixed pneumoelectric magnet valv is opened, burning torch, burning torch operation are lighted in ignition transformer sparking;

4) ignition process success:After burning torch operation, PLC controller opens small fire gas electromagnetic valve;Combustion gas, mixed gas enter Windband and bundled tube combustion head, burning torch light small fire and are considered as and light a fire successfully after Fike detector detects small fire operation, igniting Process terminates, and is transferred to step 6);

5) loss of ignition:Small fire run signal is not detected in Fike detector in ignition process, that is, is considered as loss of ignition;PLC All solenoid valves are closed in controller control, cut off natural gas supply, and start alarm equipment alarm;Air blower purges burner hearth 5 minutes, Then return step 3), restart igniting process;

6) it operates normally:It after lighting a fire successfully, is run 10-20 minutes in small fire gear, high fire combustion is opened by operation panel Burner operation is set to high fire gear by pneumoelectric magnet valve, and smoke regulating valve is opened, while being opened cigarette wind and being mixed on gas injection pipeline Bleed valve, burner enters normal operation;

7) parking step:

(1) orderly shutdown:

Flame-out button is clicked on operation panel, PLC controller controls automatic self-closing gas pipeline solenoid, and carries out The operation for stopping air blower after furnace purge operation, realizes orderly shutdown;

(2) scram:

When low nitrogen combustion apparatus in the process of running, gaseous-pressure, cigarette wind initial pressure below or above setting value or When burning torch fire extinguishing, main fray-out of flame, gas leakage, the automatic starting alarm equipment alarm of PLC controller control, and be automatically closed each Solenoid valve cuts off fuel gas pipeline, closes air blower, stops burner operation, and purged, realizes safely scram.

It should be pointed out that several improvements and changes can also be made under the premise of not departing from basic structure of the present invention, these The similar technical solution of improvements and changes also should be regarded as the protection scope of this patent.

Claims (4)

1. a kind of cigarette wind premix restrains self cooling but low nitrogen combustion apparatus, it is characterised in that:Equipped with fuel gas pipeline, air blower (2), cigarette Wind premix restrains self cooling but low NO (1);Blower inlet is connected with cigarette wind mixer (3), and blower export is connected with cigarette Wind gas mixing pipe road (9);The low NO is equipped with windband (34), is equipped with main exhaust gas nozzle (35) in windband, the main gas injection Pipe is fixed among windband across the ring flange of windband rear end, is equipped with the adjustable spinning disk in position in its front end periphery (29), a circle cigarette wind is equipped with around main exhaust gas nozzle in windband and mixes air cooling tube bank (28), which uniformly arranges Column are fixed at the periphery of main exhaust gas nozzle, and port is mixed gas phase with the cigarette wind entered in windband and led in windband thereafter, before End is protruded into boiler (32) burner hearth;It is equipped with cigarette wind in windband and mixes gas import (25), which mixes gas import and windband is arranged in Lower section;The main exhaust gas nozzle rear end is stretched out outside windband ring flange (27), is fired respectively with high fire fuel gas pipeline (12) and small fire Air pipe (22) is connected to, and is respectively equipped with valve one (14) and valve two (15) on high fire fuel gas pipeline and small fire fuel gas pipeline;Cigarette Wind premix is restrained to be additionally provided with burning torch (26) on self cooling but low NO, and the outside of cigarette wind gas mixing pipe beam is arranged in burning torch; The rear end of the burning torch is also stretched out outside windband ring flange (27), sets that there are three interfaces on burning torch, is separately connected spark plug Interface (4) lights a fire fuel gas pipeline (23) and mixes the igniting combustion supporting air piping (24) that gas import is drawn, igniting by the cigarette wind in windband Valve three (16) and valve four (11) are respectively equipped on fuel gas pipeline and igniting combustion supporting air piping, burning torch end is examined equipped with flame Survey device;The cigarette wind mixer of the blower inlet connection is equipped with air intlet and gas inlet, air intlet and big gas phase Logical, gas inlet connects the smoke backflow pipeline (10) that the flue (31) of boiler (32) is drawn;On the smoke backflow pipeline Equipped with the smoke regulating valve (6) for adjusting flue gas flow;It is all provided in the minimum point of the smoke backflow pipeline and cigarette wind gas mixing pipe road There are drain valve (5);It is equipped with the mixed gas of extraction cigarette wind in cigarette wind gas mixing pipe road and flows back into flue (31), to adjust cigarette wind initial pressure Mixed gas injection device (7), which is equipped with bleed valve (8);The air blower is equipped with air blower control cabinet;It is described big Fiery fuel gas pipeline, small fire fuel gas pipeline, igniting fuel gas pipeline are connected to the main combustible pipe road of setting respectively, and main combustible pipe road is set There are manual modulation valve (17), double cutting solenoid valves (13) and gaseous-pressure switch (21).
2. a kind of cigarette wind premix according to claim 1 restrains self cooling but low nitrogen combustion apparatus, it is characterized in that:The valve One, valve two, valve three, double cutting solenoid valves are controllable electromagnetic valve, and smoke regulating valve is electric control valve, the air blower If frequency-variable controller, the electromagnetic valve, frequency-variable controller, flame detector carry out switch control with the PLC controller of setting respectively System connection, PLC controller are equipped with operation panel.
3. a kind of cigarette wind premix according to claim 2 restrains self cooling but low nitrogen combustion apparatus, it is characterized in that:The main combustion Flow sensor and pressure sensor are equipped on air pipe and smoke backflow pipeline;Flame sensor is equipped in burner hearth, Flue be equipped with temperature sensor, the flow sensor, pressure sensor and temperature sensor respectively with the PLC controller into The transmission connection of row signal, is equipped with data memory module and data analysis module in PLC controller, pressure, stream to each pipeline Amount carries out timing monitoring and data record storage, and is analyzed, when discovery wherein has pipeline or the abnormal i.e. prison of burner hearth operation The data of control issue alarm signal when not being consistent with setting parameter, and when burner hearth is without flame, gaseous-pressure, flue gas pressures, which are lower than, to be set When definite value, fuel gas pipeline, cigarette wind gas mixing pipe road are immediately closed off while alarm.
4. the combustion method of low nitrogen combustion apparatus according to claim 3, it is characterized in that including the following steps:
1) it is switched on:PLC controller, operation panel and air blower control cabinet power on, and setting combustion gas, cigarette wind mix the normal pressure value of gas, In 10-20kPa, burner operation is set to igniting operation on operation panel, it is ensured that smoke regulating valve is closed, starting drum Fan operation;
2) fuel gas pipeline and cigarette wind gas mixing pipe road are opened:Regulating gas pressure 10-20kPa is opened and is arranged on combustion gas main pipeline Manual modulation valve, combustion gas enter in main combustible pipe road;The smoke regulating valve and air blower on smoke backflow pipe are opened, cigarette wind is mixed Feed channel is opened, and cigarette wind mixes gas and enters windband;
3) starting ignition process:Gas ignition branch road igniting gas electromagnetic valve is opened, igniting fuel gas pipeline is passed through combustion gas, opens Burning torch, burning torch operation are lighted in igniting mixed pneumoelectric magnet valv, ignition transformer sparking;
4) ignition process success:After burning torch operation, PLC controller opens small fire gas electromagnetic valve;Combustion gas, mixed gas enter windband With bundled tube combustion head, burning torch lights small fire and is considered as and lights a fire successfully, lighted a fire after flame detector detects small fire operation Journey terminates, and is transferred to step 6);
5) loss of ignition:Small fire run signal is not detected in Fike detector in ignition process, that is, is considered as loss of ignition;PLC control All solenoid valves are closed in device control, cut off natural gas supply, and start alarm equipment alarm;Air blower purging burner hearth 5 minutes, then Return step 3), restart igniting process;
6) it operates normally:It after lighting a fire successfully, is run 10-20 minutes in small fire gear, high fire combustion gas electricity is opened by operation panel Burner operation is set to high fire gear by magnet valve, and smoke regulating valve is opened, while being opened cigarette wind and being mixed drawing on gas injection pipeline Air valve, burner enter normal operation;
7) parking step:(1) orderly shutdown:
Flame-out button is clicked on operation panel, PLC controller controls automatic self-closing gas pipeline solenoid, and carries out burner hearth The operation for stopping air blower after purging operation, realizes orderly shutdown;
(2) scram:
When low nitrogen combustion apparatus in the process of running, gaseous-pressure, cigarette wind initial pressure be below or above setting value or igniting When rifle fire extinguishing, main fray-out of flame, gas leakage, the automatic starting alarm equipment alarm of PLC controller control, and each electromagnetism is automatically closed Valve cuts off fuel gas pipeline, closes air blower, stops burner operation, and purged, realizes safely scram.
CN201611100612.3A 2016-12-05 2016-12-05 A kind of cigarette wind premix restrains self cooling but low nitrogen combustion apparatus and its combustion method CN106594716B (en)

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