CN107883374A - A kind of natural gas boiler low nitrogen burning system and technique - Google Patents
A kind of natural gas boiler low nitrogen burning system and technique Download PDFInfo
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- CN107883374A CN107883374A CN201711168883.7A CN201711168883A CN107883374A CN 107883374 A CN107883374 A CN 107883374A CN 201711168883 A CN201711168883 A CN 201711168883A CN 107883374 A CN107883374 A CN 107883374A
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- air
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- natural gas
- gas boiler
- recirculating
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000003345 natural gas Substances 0.000 title claims abstract description 52
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000002485 combustion reaction Methods 0.000 claims abstract description 55
- 239000003546 flue gas Substances 0.000 claims abstract description 55
- 238000002156 mixing Methods 0.000 claims abstract description 40
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 10
- 239000000779 smoke Substances 0.000 claims abstract description 8
- 239000003517 fume Substances 0.000 claims abstract description 3
- 230000003134 recirculating effect Effects 0.000 claims description 44
- 239000007789 gas Substances 0.000 claims description 18
- 210000004894 snout Anatomy 0.000 claims description 13
- 230000003584 silencer Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 17
- 239000001301 oxygen Substances 0.000 description 17
- 229910052760 oxygen Inorganic materials 0.000 description 17
- 239000000446 fuel Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- -1 pressurize Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
-
- 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 present invention relates to a kind of natural gas boiler low nitrogen burning system and technique, partial fume is taken from the smoke duct upper shed between the outlet of natural gas boiler and cigarette fontanel, it is sent into after circulating fan pressurizes in combustion-supporting air channel, uniformly mixed with combustion air through flue gas mixing arrangement, it is another to rise through being burnt in burner nozzle feeding natural gas boiler, a kind of natural gas boiler low nitrogen burning system and technique provided by the invention, the low nitrogen burning technique can reduce natural gas boiler flue gas NOx concentration, and simple system, transformation easy to implement.
Description
Technical field
The invention belongs to combustion of natural gas pollution reduction control technology field, more particularly to a kind of low nitrogen of natural gas boiler
Combustion system and technique.
Background technology
With economic in recent years and science and technology development, requirement of the mankind to quality of life and living environment increasingly carries
Height, government are also stepping up to the emission request of pollutant, such as to power industry boiler smoke, are realizing the base of qualified discharge
On plinth, the requirement of minimum discharge is had also been proposed in recent years.As NOx requires that concentration of emission is less than 50mg/Nm3.Natural gas is a kind of clear
Clean fuel, the few environment-friendly boiler of inherently a kind of pollutant emission of natural gas boiler.But due to the raising of environmental requirement, together
Sample faces the requirement of drop nitrogen denitration transformation.Boiler, which reduces nitrogen oxidation discharge method, to include reducing NOx yields in burning, carries out cigarette
Qi exhaustion nitre.Denitrating flue gas includes SCR and SNCR techniques, and the measure of NOx yields is reduced in burning to be included using high-grade fuel (such as
Natural gas), using low nitrogen burning new technology etc..
The content of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of natural gas boiler low nitrogen burning system and technique, the low nitrogen
Burning process can reduce natural gas boiler flue gas NOx concentration, and simple system, transformation easy to implement.
The technical solution adopted in the present invention is：To the smoke duct upper shed before cigarette fontanel behind the outlet of natural gas boiler
Partial fume is taken, is sent into after circulating fan pressurizes in combustion-supporting air channel, is realized through flue gas mixing arrangement uniformly mixed with combustion air
Close, another rise is sent into stove through burner nozzle.Because the oxygen content of flue gas is less than air, the mixing being mixed into after flue gas again is combustion-supporting
Gas oxygen content also has reduction, realizes and is not reducing combustion air volume and do not changing the mixing in furnace gas flow field and fuel, fluidisation
Operating mode under, reduce the oxygen content in partial combustion region, synchronously reduce partial combustion temperature.Due to the generation of NOx in burning
Amount is closely related with local temperature, and Wen Du more is high, and NOx Chan Sheng Liang more is big.Reducing burning local temperature just can effectively reduce nitrogen oxygen
Compound yield.Simultaneously as oxygen content reduces, burning regional area is formed reproducibility gas part of anoxic, be advantageous to NOx's
Reduction, further reduce NOx yields.
On natural gas boiler, one end relative with burner nozzle set burn wind snout, draw a part do not mix
Enter the combustion air of flue gas, be sent into after preheated in stove, make due to reduce after the oxygen content of combustion zone unburned complete combustion gas after
Afterflame is burnt down entirely, realizes fractional combustion, prevents from reducing boiler thermal output.
A kind of natural gas boiler low nitrogen burning system, including natural gas boiler, air preheater, combustion air pressure fan, help
Combustion air channel, circulating fan, flue gas mixing arrangement and burner nozzle, the burner nozzle are arranged on the natural gas boiler
On, the air inlet of the combustion air pressure fan connects with external environment condition, air outlet and the air of the combustion air pressure fan
The air inlet connection of preheater, the air outlet of the air preheater are connected by the combustion-supporting air channel and the burner nozzle
It is logical, and then enter the natural gas boiler, the air inlet of the circulating fan with positioned at the outlet of natural gas boiler and cigarette fontanel it
Between smoke duct connection, the air outlet of the circulating fan connects with the air inlet of the flue gas mixing arrangement, the flue gas
The air outlet of mixing arrangement connects with the combustion-supporting air channel.
The circulating fan is frequency conversion fan, sets two altogether, and two Fans can be run simultaneously according to boiler load situation,
A Fans can be only run, a normal use, one standby, and two Fans add up to maximum quantity of wind to be about combustion air volume
20%, adjusted in real time according to operating condition；Pressure and recirculating gas duct drag overall of its pressure according to mixing point combustion-supporting wind system
Costing bio disturbance is drawn, ensures that flue gas recycled pressure is higher than combustion-supporting wind pressure at mixing；And it is respectively kept with appropriate surplus.
In one of the embodiments, on the natural gas boiler, one end relative with the burner nozzle
It is provided with side wall and burns wind snout, the wind snout that burns is connected by pipeline with the air outlet of the air preheater.
In one of the embodiments, the flue gas mixing arrangement includes recirculating air duct and air jet pipe, the recycling
Air channel is arranged on inside the combustion-supporting air channel, and the recirculating air duct is vertical with the combustion-supporting air channel inwall, and the air jet pipe is set
Put in the side wall of the recirculating air duct lee face.
The flue gas mixing arrangement is to be inserted after recirculating gas duct reduces bore from the side at the straight length in combustion-supporting air channel
In combustion-supporting air channel, and the more air jet pipes of installation that are open, so as to allow flue gas recycled to be uniformly blended into combustion air.
In one of the embodiments, the recirculating air duct entrance point is consolidated with the combustion-supporting air channel inwall welded seal
Fixed, the recirculating air duct port of export is by steel plate welded seal, and the shaped steel by being welded on the combustion-supporting air channel inwall
Support is fixed.
In one of the embodiments, the recirculating air duct section is octagon, and the recirculating air duct section is met
Wind vertical plane size is less than the size of another vertical plane, and the top and bottom that the vertical plane windward in the recirculating air duct section is adjacent are equal
For inclined-plane, and it is tangent with the rear end in the combustion-supporting air channel respectively.
In one of the embodiments, it is provided with jet on the vertical plane and inclined-plane of the recirculating air duct lee face
The diameter of pipe and the air jet pipe on the vertical plane of the recirculating air duct lee face is less than the diameter of the air jet pipe on inclined-plane, institute
It is 45 degree -80 to state the angular range between the air jet pipe on the air jet pipe and inclined-plane on the vertical plane of recirculating air duct lee face
Degree.
In one of the embodiments, the recirculating air duct and on the combustion-supporting air channel of the recirculating air duct rear end
Differential pressure transmitter is provided with, differential pressure transmitter is provided with the inlet and outlet of flue gas mixing arrangement, passes through the differential pressure value and fixed warp
Formula is tested, the flow of circulating flue gas can be calculated, is easy to adjust；Installed successively on the pipeline of the combustion air pressure fan air inlet
There are silencer and expansion joint, expansion joint and motorized adjustment wind are sequentially installed with the pipeline of the combustion air pressure fan air outlet
, it is sequentially installed with expansion joint, isolating valve, silencer and expansion joint, the circulation on the pipeline of the circulating fan air inlet
Expansion joint and isolating valve are sequentially installed with the pipeline of fan outlet, is provided with the pipeline of the air heater air inlet
Electric adjustable air doors, electric adjustable air doors, the flue gas mixing dress are installed on the pipeline of the flue gas mixing arrangement air inlet
Put and expansion joint is installed on the pipeline of air outlet.
Flue thermal expansion is caused to damage to system during to prevent start-stop boiler, and expansion joint is respectively arranged with flue；For
It is easy to circulating fan to overhaul, isolation air door is provided with the pipeline of circulating fan inlet and outlet；To reduce circulating fan noise, following
Silencer is set on the pipeline of ring fan inlet.
To adjust circulating flue gas flow, a circulating fan can be singly driven, two circulating fans can be also opened simultaneously, may be used also
The operating mode of circulating fan is adjusted by frequency conversion, small Flow-rate adjustment is then realized by the electric adjustable air doors on circulation air path.
Air quantity is burnt then to be adjusted by burning the electric adjustable air doors on the pipeline of wind snout.
In one of the embodiments, the combustion system is automatically controlled by DCS (PLC), artificial supervision, described
DCS (PLC) automatic control system includes boiler original control system.
Beneficial effect acquired by the present invention is：On the premise of natural gas combustion stability in ensureing boiler, from chimney
Preceding exhaust uptake inner opening extension flue gas, pressurize, air circulation regulation door regulation air quantity, pass through through flue gas recirculation blower fan
Flue gas mixing arrangement is well mixed with combustion air, is sprayed into stove and is burnt by burner nozzle.Due to the oxygen content of flue gas
Less than air, being mixed into the mixing combustion-supporting gas oxygen content after flue gas recycled also has reduction, realize do not reduce combustion air volume and
Do not change under the mixing in furnace gas flow field and fuel, the operating mode of fluidisation, reduce the oxygen content in partial combustion region, it is synchronous to reduce
Partial combustion temperature.Because NOx yield in burning and local temperature are closely related, Wen Du more is high, NOx Chan Sheng Liang more
Greatly.Reducing burning local temperature just can effectively reduce nitrogen oxides yield.Simultaneously as oxygen content reduces, make burning local
Region forms reproducibility gas part of anoxic, is advantageous to NOx reduction, further reduces NOx yields.Positioned at natural gas boiler
It is provided with the side wall of upper, relative with burner nozzle one end and burns wind snout, is drawn a part and be not mixed into helping for circulating flue gas
Wind is fired, is sent into after preheated in stove, is made because unburned complete combustion gas burns away completely after reducing combustion zone oxygen content,
Fractional combustion is realized, prevents from reducing boiler thermal output.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of the invention；
Fig. 2 is the structural representation of the flue gas mixing arrangement in one embodiment of the invention；
Fig. 3 is the side structure schematic diagram of the flue gas mixing arrangement in one embodiment of the invention.
Embodiment
As shown in Figure 1-Figure 3, part cigarette is taken to the smoke duct upper shed before cigarette fontanel behind the outlet of natural gas boiler 1
Gas, it is sent into after the pressurization of circulating fan 9 in combustion-supporting air channel 16, realizes through flue gas mixing arrangement 13 and mixed with the uniform of combustion air,
Another rise is sent into stove through burner noz(zle) 15.Because the oxygen content of flue gas is less than air, the mixing combustion-supporting gas after flue gas is mixed into
Oxygen content also has reduction, realizes in the work for not reducing combustion air volume and not changing the mixing in furnace gas flow field and fuel, fluidizing
Under condition, the oxygen content in partial combustion region is reduced, synchronously reduces partial combustion temperature.Due in burning NOx yield with
Local temperature is closely related, and Wen Du more is high, and NOx Chan Sheng Liang more is big.Reducing burning local temperature just can effectively reduce nitrogen oxides
Yield.Simultaneously as oxygen content reduces, burning regional area is formed reproducibility gas part of anoxic, be advantageous to going back for NOx
Original, further reduce NOx yields.
On natural gas boiler 1, one end relative with burner nozzle 15 set burn wind snout 21, draw a part
The combustion air of circulating flue gas is not mixed into, is sent into after preheated in stove, is made due to unburned complete after reduction combustion zone oxygen content
Combustion gas burn away completely, realize fractional combustion, prevent reduce boiler thermal output.
A kind of natural gas boiler low nitrogen burning system, including natural gas boiler 1, air preheater 2, combustion air pressure fan 3,
Combustion-supporting air channel, circulating fan 9, flue gas mixing arrangement 13 and burner nozzle 15, burner nozzle 15 are arranged on natural gas boiler 1
On, the air inlet of combustion air pressure fan 3 connects with external environment condition, the air outlet of combustion air pressure fan 3 and entering for air preheater 2
Air port is connected, and the air outlet of air preheater 2 connected by combustion-supporting air channel with burner nozzle 15, so with natural gas boiler 1
Connection, the air inlet of circulating fan 9 connect with the smoke duct between the outlet of natural gas boiler 1 and cigarette fontanel, circulated air
The air outlet of machine 9 connects with the air inlet of flue gas mixing arrangement 13, and the air outlet of flue gas mixing arrangement 13 connects with combustion-supporting air channel.
Circulating fan 9 is frequency conversion fan, sets two altogether, can run two Fans simultaneously according to boiler load situation, also may be used
Only one Fans of operation, a normal use, one is standby, and two Fans add up to maximum quantity of wind to be about the 20% of combustion air volume,
Adjusted in real time according to operating condition；Its pressure is according to the pressure of mixing point combustion-supporting wind system and recirculating gas duct drag overall loss meter
Draw, ensure that flue gas recycled pressure is higher than combustion-supporting wind pressure at mixing；And it is respectively kept with appropriate surplus.
Two circulating fan outlet conduits are separated into two air channels and respectively enter two combustion-supporting air channels after converging, pass through mixing
Device 13 respectively enters boiler left and right sides burner after being mixed with combustion air, and expansion joint 8 and electricity are mounted on every air channel
Dynamic or pneumatic damper 12.
For example, being directed to the less natural gas boiler of tonnage, then only a circulating fan 9 and one corresponding with supply air system need to be set
Bar cycle flue.
On natural gas boiler 1, it is provided with the side wall of one end relative with burner nozzle 15 and burns wind snout 21,
Wind snout 21 is burnt to connect with the air outlet of air preheater 2 by pipeline.
Flue gas mixing arrangement 13 includes recirculating air duct 17 and air jet pipe 18, and recirculating air duct 17 is arranged on combustion-supporting air channel 16
Inside, recirculating air duct 17 is vertical with the combustion-supporting inwall of air channel 16, and air jet pipe 18 is arranged on the side wall of the lee face of recirculating air duct 17
On.
Flue gas mixing arrangement 13 is to be inserted after recirculating gas duct 17 reduces bore from the side at the straight length in combustion-supporting air channel 16
Enter in combustion-supporting air channel 16, and the more air jet pipes 18 of installation that are open, so as to allow flue gas recycled to be uniformly blended into combustion air.
The entrance point of recirculating air duct 17 is fixed with the combustion-supporting inwall welded seal of air channel 16, and the port of export of recirculating air duct 17 passes through
Steel plate welded seal, and the support of the shaped steel 19 by being welded on the combustion-supporting inwall of air channel 16 is fixed.
The section of recirculating air duct 17 is octagon, and the size of vertical plane windward in the section of recirculating air duct 17 is vertical less than another
The size in face, the top and bottom that the vertical plane windward in the section of recirculating air duct 17 is adjacent are inclined-plane, and respectively with combustion-supporting air channel 16
Rear end it is tangent.
Air jet pipe 18 is provided with the vertical plane and inclined-plane of the lee face of recirculating air duct 17 and recirculating air duct 17 is leeward
The diameter of air jet pipe 18 on the vertical plane in face is less than the diameter of the air jet pipe 18 on inclined-plane, and recirculating air duct carries on the back hanging down for 17 wind faces
Angular range between the air jet pipe on air jet pipe and inclined-plane faced directly is 45 degree -80 degree, preferably 60 degree.
Recirculating air duct 17 and differential pressure transmitter 14 is provided with the combustion-supporting air channel of the rear end of recirculating air duct 17, in cigarette
The inlet and outlet of gas mixing arrangement 13 are provided with differential pressure transmitter 14, by the differential pressure value and fixed empirical equation, can calculate and follow
The flow of ring flue gas, it is easy to adjust；Silencer 7 and expansion joint 8 are sequentially installed with the pipeline of the air inlet of combustion air pressure fan 3,
Expansion joint 8 and electric adjustable air doors 12, the air inlet of circulating fan 9 are sequentially installed with the pipeline of the air outlet of combustion air pressure fan 3
Pipeline on be sequentially installed with expansion joint 8, isolating valve 6, silencer 7 and expansion joint 8, on the pipeline of the air outlet of circulating fan 9 according to
It is secondary that expansion joint 8 and isolating valve 6 are installed, electric adjustable air doors 12 are installed on the pipeline of the air inlet of air heater 2, flue gas mixes
Attach together and electric adjustable air doors 12 are installed on the pipeline for putting 13 air inlets, be provided with the pipeline of the air outlet of flue gas mixing arrangement 13
Expansion joint 8.
Flue thermal expansion is caused to damage to system during to prevent start-stop boiler 1, and expansion joint 8 is respectively arranged with flue；
Overhauled for ease of circulating fan 9, isolation air door 6 is provided with the pipeline that circulating fan 9 is imported and exported；Made an uproar to reduce circulating fan 9
Sound, silencer 7 is set on the pipeline of the import of circulating fan 9.
To adjust circulating flue gas flow, a circulating fan 9 can be singly driven, can also open two circulating fans 9 simultaneously, also
The operating mode of circulating fan 9 can be adjusted by frequency conversion, small Flow-rate adjustment then passes through the electric adjustable air doors 12 on circulation air path 9
Realize.The electric adjustable air doors 12 on pipeline of the air quantity then by burning wind snout 21 are burnt to be adjusted.
Combustion system provided by the present invention is automatically controlled by DCS or PLC, and artificial supervision, DCS or PLC are automatic
Control system includes boiler original control system, realizes overall-in-one control schema.
Preferably, natural gas boiler low nitrogen burning technique provided by the invention can be additionally used in other type of furnace boilers or kiln
Low nitrogen burning, it may also be used for the mixing of the gaseous fluid of any two kinds of different parameters.Then it is to be mixed into such as CFBB
Combustion air after flue gas recycled is sent into below the air distribution plate of furnace bottom, by air distribution plate and gas cap even into stove, by stove
Fuel is fluidized and burnt.Same principle, it can also reduce CFBB flue gas NOx concentration.The layers such as chain furnace fire
Stove is also that will be mixed into the combustion air after flue gas recycled to be sent into below the air distribution plate of furnace bottom, is entered by air distribution plate in stove, passed through
Fuel bed makes fuel combustion, also due to reducing burning local temperature after reducing oxygen content and causing reproducibility gas part, reduces
NOx yields, reach the purpose for reducing NOx concentration in flue gas.
Preferably, natural gas boiler includes combustion system, and the drum to boiler water supply, burning system are provided with above combustion system
System includes burner hearth, is sequentially provided with burner and water-cooling wall chamber in burner hearth from top to bottom, is provided with what is be connected with drum above burner hearth
Upper collecting chamber, burner hearth antetheca outside are provided with the lower header being connected with the drum, and water-cooling wall intracavitary is provided with two panels cold water screen, two panels water
The upper/lower terminal of cold screen is each passed through roof of the furnace and burner hearth antetheca, and connection corresponding with upper collecting chamber and lower header respectively, in order to
Preferably reduce bed temperature, reduce oxygen amount, and then reduce NO2 original emission, the present invention adds two water coolings in burner hearth
Screen, water-cooling screen cool with water-cooling wall collective effect to fluid bed, and water-cooling screen passes through carbonated drink with steam water interface caused by water-cooling wall
Connecting tube is sent into upper collecting chamber.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of natural gas boiler low nitrogen burning system, it is characterised in that including natural gas boiler, air preheater, combustion air
Pressure fan, combustion-supporting air channel, circulating fan, flue gas mixing arrangement and burner nozzle, the burner nozzle are arranged on the day
On right gas boiler, the air inlet of the combustion air pressure fan connects with external environment condition, the air outlet of the combustion air pressure fan and
The air inlet connection of the air preheater, the air outlet of the air preheater pass through the combustion-supporting air channel and the burner
Nozzle connects, and then is connected with the natural gas boiler, the air inlet of the circulating fan and the outlet for being located at natural gas boiler
Smoke duct between cigarette fontanel connects, and the air outlet of the circulating fan connects with the air inlet of the flue gas mixing arrangement,
The air outlet of the flue gas mixing arrangement connects with the combustion-supporting air channel.
2. a kind of natural gas boiler low nitrogen burning system according to claim 1, it is characterised in that positioned at the natural gas
On boiler, it is provided with the side wall of one end relative with the burner nozzle and burns wind snout, the wind snout that burns passes through
Pipeline connects with the air outlet of the air preheater.
A kind of 3. natural gas boiler low nitrogen burning system according to claim 2, it is characterised in that the flue gas mixing dress
Put including recirculating air duct and air jet pipe, the recirculating air duct is arranged on inside the combustion-supporting air channel, the recirculating air duct
Vertical with the combustion-supporting air channel inwall, the air jet pipe is arranged in the side wall of the recirculating air duct lee face.
A kind of 4. natural gas boiler low nitrogen burning system according to claim 3, it is characterised in that the recirculating air duct
Entrance point is fixed with the combustion-supporting air channel inwall welded seal, the recirculating air duct port of export by steel plate welded seal, and
Fixed by the type steel support being welded on the combustion-supporting air channel inwall.
A kind of 5. natural gas boiler low nitrogen burning system according to claim 4, it is characterised in that the recirculating air duct
Section is octagon, and the size of vertical plane windward in the recirculating air duct section is less than the size of another vertical plane, described to follow again
The top and bottom that the vertical plane windward of ring duct cross-section is adjacent are inclined-plane, and tangent with the rear end in the combustion-supporting air channel respectively.
A kind of 6. natural gas boiler low nitrogen burning system according to claim 5, it is characterised in that the recirculating air duct
The air jet pipe being provided with the vertical plane and inclined-plane of lee face on the vertical plane of air jet pipe and the recirculating air duct lee face
Diameter be less than the diameter of the air jet pipe on inclined-plane, on the air jet pipe and inclined-plane on the vertical plane of the recirculating air duct lee face
Air jet pipe between angular range be 45 degree -80 degree.
A kind of 7. natural gas boiler low nitrogen burning system according to claim 6, it is characterised in that the recirculating air duct
With differential pressure transmitter is provided with the combustion-supporting air channel of the recirculating air duct rear end, the combustion air pressure fan air inlet
Silencer and expansion joint are sequentially installed with pipeline, expansion joint is sequentially installed with the pipeline of the combustion air pressure fan air outlet
And electric adjustable air doors, expansion joint, isolating valve, silencer and expansion are sequentially installed with the pipeline of the circulating fan air inlet
Save, expansion joint and isolating valve are sequentially installed with the pipeline of the circulating fan air outlet, the air heater air inlet
Electric adjustable air doors are installed on pipeline, electric adjustable air doors are installed on the pipeline of the flue gas mixing arrangement air inlet, institute
State and expansion joint is installed on the pipeline of flue gas mixing arrangement air outlet.
A kind of 8. natural gas boiler low nitrogen burning system according to claim 7, it is characterised in that the low nitrogen burning system
System is automatically controlled by DCS or PLC, artificial supervision, and the DCS or PLC automatic control system include boiler original control system
System.
9. a kind of process using any described natural gas boiler low nitrogen burning systems of claim 1-8, its feature exists
In taking partial fume from the smoke duct upper shed between the outlet of natural gas boiler and cigarette fontanel, pressurizeed through circulating fan
After be sent into combustion-supporting air channel, uniformly mixed with combustion air through flue gas mixing arrangement, another rise is sent into natural gas through burner nozzle
Burnt in boiler.
10. process according to claim 9, it is characterised in that on natural gas boiler, with the burner
The relative one end of nozzle sets and burns wind snout, by it is described burn wind snout introduce a part after air preheater preheats,
It is mixed into the combustion air before flue gas to be sent into natural gas boiler, realizes fractional combustion.
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