CN109340789A - The steady combustion process of the low nitrogen of carbon black tail gas and the low nitrogen of carbon black tail gas surely fire system - Google Patents
The steady combustion process of the low nitrogen of carbon black tail gas and the low nitrogen of carbon black tail gas surely fire system Download PDFInfo
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- CN109340789A CN109340789A CN201811413423.0A CN201811413423A CN109340789A CN 109340789 A CN109340789 A CN 109340789A CN 201811413423 A CN201811413423 A CN 201811413423A CN 109340789 A CN109340789 A CN 109340789A
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- combustion
- carbon black
- low
- tail gas
- black tail
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- 239000007789 gas Substances 0.000 title claims abstract description 190
- 239000006229 carbon black Substances 0.000 title claims abstract description 153
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 110
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 40
- 239000000567 combustion gas Substances 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- 239000002737 fuel gas Substances 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000000446 fuel Substances 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 238000010792 warming Methods 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 48
- 239000003546 flue gas Substances 0.000 claims description 48
- 239000003610 charcoal Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000008246 gaseous mixture Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 210000000038 chest Anatomy 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 nitrogenous compound Chemical class 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 208000021760 high fever Diseases 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
Abstract
The present invention provides carbon black tail gas the low steady combustion process of nitrogen, containing a) being provided with low NO and the low nitrogen of adiabatic furnace surely fires system；B) high heating value combustion gas enters low NO, and combustion air enters low NO；C) high heating value fuel gas buring and after being warming up to carbon black tail gas ignition condition, carbon black tail gas divides two-way to be divided into low NO and adiabatic furnace top, and cuts off high heating value combustion gas；Three tunnels of carbon black tail gas combustion air point are divided into low NO, adiabatic furnace top and adiabatic furnace lower part simultaneously；Exhaust gas is divided into the lower part of low NO and adiabatic furnace；Enter low NO after part carbon black tail gas combustion air and portion mixing, it is introduced by the distribution of carbon black tail gas two-way, the distribution of three tunnel of carbon black tail gas combustion air and exhaust gas in step c) so that in low NO and adiabatic furnace top is in fuel-rich low oxygen combustion atmosphere and forms reducing atmosphere, adiabatic furnace lower part is in completely burned state.The present invention also provides the low nitrogen of carbon black tail gas surely to fire system.
Description
Technical field:
The present invention relates to fuel combustion technique, in particular to the steady combustion process of the low nitrogen of a kind of carbon black tail gas and the low nitrogen of carbon black tail gas surely fire
System.
Background technique:
China is an energy-consuming big country based on coal, and fossil fuel largely consumes bring pollutant and greenhouse gases row
It puts and causes serious harm to ecological environment, the single energy resource structure based on coal also faces energy resources huge challenge in short supply.
Based on the considerations of energy resource supply and environment to the receiving capacity of emission, for the low-heating-value tail gas of chemical production process association
(calorific value Q < 1500kCal/m3), especially carbon black tail gas, it is necessary to it abandons original direct emission or puts the mode of day lamp, then into
The residual heat resources of row high-efficiency cleaning utilize, and the in short supply of the existing energy is effectively relieved, and reduce the pollution to environment.
Prior art is to guarantee that stablizing for carbon black tail gas is burnt, and mostly uses to mix and burns exotic fuels, oxygen-enriched combusting, pure oxygen combustion
Burning, high temperature air preheated burning technology etc., wherein mix burning exotic fuels, i.e., it is the most reliable in such a way that altar lamp is with burning,
But increase the consumption of fuel.Meanwhile carbon black tail gas because calorific value it is low, flame temperature is low, and the generation of thermal NO x substantially reduces,
But since carbon black tail gas usually contains nitrogenous compound during its generation, it is easy to be oxidized to fuel type in combustion
NOx, therefore the phenomenon that the generally existing nitrogen oxides of the combustion product gases of carbon black tail gas is exceeded.
Summary of the invention:
In order to overcome the problems referred above, the steady combustion process of the low nitrogen of carbon black tail gas that the present invention provides a kind of high-efficiency cleaning will be advantageous,
It not only can guarantee that the independence of combustion gas stablizes burning, but also be able to achieve cleaning low nitrogen burning；The present invention also provides a kind of carbon black tail gas
Low nitrogen surely fires system.
For this purpose, present invention firstly provides a kind of steady combustion process of the low nitrogen of carbon black tail gas comprising following steps:
A) providing, there is the low nitrogen of low NO and adiabatic furnace surely to fire system；
B) high heating value combustion gas is passed through low NO by high heating value fuel gas pipeline, while high heating value gas-fired combustion-supporting air is led to
It crosses combustion air pipeline and is passed through low NO；
C) after after high heating value fuel gas buring and being gradually warming up to carbon black tail gas ignition condition, divide two-way through charcoal black tail carbon black tail gas
Tracheae one and carbon black tail gas pipe two respectively enter the top of low NO and adiabatic furnace, and cut off the confession of high heating value combustion gas
It answers；Three tunnels of carbon black tail gas combustion air point are distinguished through combustion-aid air pipe one, combustion-aid air pipe two and combustion-aid air pipe three simultaneously
Into the lower part of low NO, the top of adiabatic furnace and adiabatic furnace；And system will be surely fired and through outside from low nitrogen
Exhaust gas after heat exchange cooling respectively enters low NO and adiabatic furnace via circulating flue gas branch pipe and circulating flue gas endless tube
Lower part；
Wherein, the carbon black tail gas combustion air from combustion-aid air pipe one and the exhaust gas from circulating flue gas branch pipe are through gaseous mixture
Enter low NO after pipe mixing, circulating flue gas endless tube is arranged in the lower section of combustion-aid air pipe three, passes through carbon black in step c)
The two-way distribution of tail gas, the three tunnels distribution of carbon black tail gas combustion air and the introducing of exhaust gas are so that in low NO
And adiabatic furnace top is in fuel-rich low oxygen combustion atmosphere and forms reducing atmosphere, and adiabatic furnace lower part is in
Combustion gas completely burned state.
In the present invention, by low NO, the classification of carbon black tail gas, the classification of carbon black tail gas combustion air and
The modes such as the introducing of exhaust gas, enable carbon black tail gas in low NO and the top of adiabatic furnace is oxygen debt burns, and
Make combustion zone that there is lower burning velocity and temperature, form reducing atmosphere, inhibit the generation of NOx, can integrate reduces nitrogen oxygen
Compound discharge amount 50 ~ 60%, while carrying out completely burned in the lower part of adiabatic furnace and avoiding energy waste and environmental pollution.
Further, in step c), pass through the combustion-supporting sky of carbon black tail gas of combustion-aid air pipe one and the conveying of combustion-aid air pipe two
Gas accounts for the 80~90% of total carbon black tail gas combustion air.
By this set, so that the oxygen debt burning of carbon black tail gas in the top of adiabatic furnace, forms reducing atmosphere,
Inhibit the generation of NOx.
Further, in step c), the exhausted air quantity for the exhaust gas for entering circulating flue gas branch pipe by frequency conversion fan control is
The 30~40% of the air capacity of total carbon black tail gas combustion air.
The setting of this step is to reduce burning velocity and ignition temperature in order to utilize flue gas dilution oxygen concentration, inhibit NOx's
It generates.
Further, in step c), the carbon black tail gas in carbon black tail gas pipe one and carbon black tail gas pipe two accounts for total respectively
The 50~70% of carbon black tail gas and 30~50%.
The principle of carbon black tail gas classification is first to feed a part of combustion gas, then remaining combustion gas is fed again, in this way, in this way
It is classified using carbon black tail gas, it can be first with relatively little of combustion gas and relatively more air burning, such air excess, reduction combustion
Temperature, subsequent remaining combustion gas and relatively little of air burning are burnt, combustion gas is excessive, has reducing atmosphere.
Also further, the carbon black tail gas combustion air conveyed by combustion-aid air pipe one is defeated by carbon black tail gas pipe one
1.2 times of the air equivalent of the carbon black tail gas sent.
Setting is exactly first to guarantee to feed combustion gas compared with air in low NO in this way, and combustion gas is less, and air is more, just
It is the first step of combustion gas classification.
Further, after the supply of high heating value combustion gas is cut off, high heating value gas-fired combustion-supporting air continues through combustion air
Pipeline inputs low NO with the burning torch of the cooling low NO.
Further, low NO is bluff body burner, is inside integrated with high heating value fuel gas buring module and carbon black tail gas
Combustion module；Adiabatic furnace is provided with the multilayer brick of resistance to material or castable inside it to keep the temperature.
The present invention also provides a kind of low nitrogen of carbon black tail gas surely to fire system comprising low NO and adiabatic furnace also wrap
It includes:
High heating value fuel gas pipeline is connect so that high heating value combustion gas to be sent into low NO with low NO；
Combustion air pipeline is connect so that combustion air being capable of combustion-supporting high heating value combustion gas with low NO；
Carbon black tail gas delivery pipe comprising carbon black tail gas pipe one and carbon black tail gas pipe two, they be separately connected low NO and
The top of adiabatic furnace；
Carbon black tail gas combustion air delivery pipe comprising combustion-aid air pipe one, combustion-aid air pipe two and combustion-aid air pipe three, they
It is separately connected the lower part of low NO, the top of adiabatic furnace and adiabatic furnace；
Circulating flue gas delivery pipe comprising circulating flue gas branch pipe and circulating flue gas endless tube, they be separately connected low NO and
The lower part of adiabatic furnace；
Wherein, combustion-aid air pipe one connects low NO through mixture pipe with circulating flue gas branch pipe, and circulating flue gas endless tube is set
It sets in the lower section of combustion-aid air pipe three.
The present invention by using low NO, combustion gas classification, air classification and the low-NO_x combustion technology of flue gas recirculation,
Can integrate reduces nitrogen oxide emission 50 ~ 60%.
Further, low NO is bluff body burner, is inside integrated with high heating value fuel gas buring module and carbon black tail gas
Combustion module.
It is capable of forming bias combustion region in bluff body burner, the oxygen debt burning of partial flame can be effectively realized, in this area
In domain, combustion gas burn incompletely forms CHi group and H- ion, forms reducing atmosphere, and then restore and inhibit the production of NOx
It is raw.
Further, adiabatic furnace is laid with the multilayer brick of resistance to material or castable inside it to keep the temperature.
By this structure setting of adiabatic furnace, so that heat-loss at wall loss is effectively reduced, burner hearth high temperature is kept.
By reference to the embodiments described below, above-mentioned these and other aspects of the invention will obtain more clear
It illustrates clearly.
Detailed description of the invention:
The structure of invention and further objects and advantages will be better understood by description with reference to the accompanying drawing,
In, identical reference marker identifies identical element:
Fig. 1 is that the low nitrogen of carbon black tail gas of a specific embodiment according to the present invention surely fires the structural schematic diagram of system.
Specific embodiment:
A specific embodiment of the invention is described below in conjunction with attached drawing.
As shown in Figure 1, surely the system of firing includes low nitrogen to the low nitrogen of carbon black tail gas of a specific embodiment according to the present invention
Burner 1, adiabatic furnace 2, high heating value fuel gas pipeline 3, combustion air pipeline 4, carbon black tail gas delivery pipe 5, carbon black tail gas are combustion-supporting
Air delivery pipe 6 and circulating flue gas delivery pipe 7.Wherein, high heating value fuel gas pipeline 3 is connect with by high fever with low NO 1
It is worth combustion gas to be sent into low NO 1；Combustion air pipeline 4 is connect with low NO 1 so that combustion air can be combustion-supporting
High heating value combustion gas；Carbon black tail gas delivery pipe 5 includes carbon black tail gas pipe 1 and carbon black tail gas pipe 2 52, they are separately connected low nitrogen
The top of burner 1 and adiabatic furnace 2；Carbon black tail gas combustion air delivery pipe 6 includes combustion-aid air pipe 1, combustion-aid air pipe
2 62 and combustion-aid air pipe 3 63, they are separately connected under low NO 1, the top of adiabatic furnace 2 and adiabatic furnace 2
Portion；Circulating flue gas delivery pipe 7 includes circulating flue gas branch pipe 71 and circulating flue gas endless tube 72, they are separately connected low NO 1
With the lower part of adiabatic furnace 2.
As shown in Figure 1, combustion-aid air pipe 1 and circulating flue gas branch pipe 71 connect low NO 1 through mixture pipe 67,
And the lower section of combustion-aid air pipe 3 63 is arranged in circulating flue gas endless tube 72.In the present embodiment, low NO 1 is bluff body combustion
Burner is inside integrated with high heating value fuel gas buring module and carbon black tail gas combustion module (not shown)；Adiabatic furnace 2 is inside it
It is laid with the multilayer brick of resistance to material or castable, heat-loss at wall loss is effectively reduced, keeps burner hearth high temperature.
Shown in referring to Fig.1, the low nitrogen of carbon black tail gas for introducing a specific embodiment according to the present invention surely fires work
Skill comprising following steps:
A) providing, there is the low nitrogen of low NO 1 and adiabatic furnace 2 surely to fire system；
B) high heating value combustion gas is passed through low NO 1 by high heating value fuel gas pipeline 3, while by high heating value gas-fired combustion-supporting air
Low NO 1 is passed through by combustion air pipeline 4 with the combustion-supporting high heating value combustion gas；
C) after after high heating value fuel gas buring and being gradually warming up to carbon black tail gas ignition condition, divide two-way through charcoal black tail carbon black tail gas
Tracheae 1 and carbon black tail gas pipe 2 52 respectively enter the top of low NO 1 and adiabatic furnace 2, and cut off high heating value combustion gas
Supply；
Simultaneously by three tunnels of carbon black tail gas combustion air point through combustion-aid air pipe 1, combustion-aid air pipe 2 62 and combustion-aid air pipe three
63 respectively enter the lower part of low NO 1, the top of adiabatic furnace 2 and adiabatic furnace 2；And system will be surely fired from low nitrogen
And the exhaust gas after external heat-exchanging cools down respectively enters low NO 1 via circulating flue gas branch pipe 71 and circulating flue gas endless tube 72
With the lower part of adiabatic furnace 2；
Wherein, the carbon black tail gas combustion air from combustion-aid air pipe 1 and the exhaust gas from circulating flue gas branch pipe 71 are through mixed
It closes after tracheae 67 mixes and enters low NO 1, circulating flue gas endless tube 72 is arranged in the lower section of combustion-aid air pipe 3 63, passes through step
It is rapid c) in carbon black tail gas two-way distribution, carbon black tail gas combustion air three tunnels distribution and exhaust gas introducing so that low
In nitrogen burner 1 and 2 top of adiabatic furnace is in fuel-rich low oxygen combustion atmosphere and forms reducing atmosphere, and to be insulated
2 lower part of burner hearth is in combustion gas completely burned state.
Further, it in step c), is helped by the carbon black tail gas that combustion-aid air pipe 1 and combustion-aid air pipe 2 62 convey
Combustion air accounts for the 80~90% of total carbon black tail gas combustion air.
Further, in step c), the exhaust gas of circulating flue gas branch pipe 71 is entered by the control of frequency conversion fan (not shown)
Exhausted air quantity be total carbon black tail gas combustion air air capacity 30~40%.
Further, in step c), the carbon black tail gas in carbon black tail gas pipe 1 and carbon black tail gas pipe 2 52 accounts for respectively
The 50~70% of total carbon black tail gas and 30~50%.
Also further, the carbon black tail gas combustion air conveyed by combustion-aid air pipe 1 is to pass through carbon black tail gas pipe one
1.2 times of the air equivalent of the carbon black tail gas of 51 conveyings.
Further, after the supply of high heating value combustion gas is cut off, high heating value gas-fired combustion-supporting air continues through combustion air
Pipeline 4 inputs low NO 1 with the burning torch (not shown) of the cooling low NO 1.
In the present embodiment, the low nitrogen of carbon black tail gas, which surely fires when system operates normally, individually uses carbon black tail gas as combustion
Material does not use altar lamp or other high heating value combustion gas.High heating value fuel gas buring module and charcoal black tail are integrated in low NO 1
Gas combustion module, that is to say, that be equipped in low NO 1 dedicated for the spout of high heating value combustion gas and dedicated for charcoal black tail
The spout of gas.Combustion air needed for high heating value fuel gas buring by independent blower (not shown) air feed, through combustion air pipeline 4 into
Enter low NO 1, is mixed and burned with high heating value combustion gas, fuel when high heating value combustion gas starts as low NO 1.
After after high heating value fuel gas buring and being gradually warming up to carbon black tail gas ignition condition, by carbon black tail gas pipe 1 and carbon black
Offgas duct 2 52 introduces carbon black tail gas, and combustion gas is lighted rapidly more than ignition temperature.Low NO 1 uses bluff body and surely fires
Principle can flame can be charcoal black tail under the insulation effect of adiabatic furnace 2 in the middle part of low NO 1 is centrally formed and stablizes
Air lift maintains spontaneous combustion for stablizing the required ignition heat that burns, and the companion without high heating value combustion gas burns.High heating value combustion gas is cut
It has no progeny, operating is kept to the independent blower of high heating value combustion gas air feed, and use level-one power load, so that high heating value combustion gas
Combustion air continues through combustion air pipeline 4 and is sent into low NO 1, has with the burning torch to low NO 1
The cooling of effect.
To realize low nitrogen burning, combustion process uses low NO 1 and combustion gas classification, air classification and flue gas
Circulating technology makes introduction separately below:
1) low NO 1 is provided with combustion gas spout inside and outside multiply in itself, can form bias combustion region, can effectively realize
The oxygen debt burning of partial flame, in this area, combustion gas burn incompletely form CHi group and H- ion, form reproducibility gas
Atmosphere, and then restore and inhibit the generation of NOx.
2) burning of carbon black tail gas uses multistage combustion mode, divides two-way to enter adiabatic furnace 2, wherein 50-70% all the way
Carbon black tail gas by carbon black tail gas pipe 1 enter low NO 1, the carbon black tail gas of another way about 30-50% is by carbon black tail gas
Pipe 2 52 is connected to adiabatic furnace 2 by means of interface 25, and interface 25 tangentially connects with adiabatic furnace 2, and carbon black tail gas enters heat insulation furnace
To the lower flow of adiabatic furnace 2 in a manner of tangential swirl after thorax 2.
3) three tunnels of carbon black tail gas combustion air point enter combustion zone, wherein carbon black tail gas combustion air is by helping all the way
It fires air hose 1 and enters low NO 1, as the combustion air of main flame, remaining two-way carbon black tail gas combustion air difference
Enter the upper and lower part of adiabatic furnace 2 via combustion-aid air pipe 2 62 and combustion-aid air pipe 3 63.In the process, using charcoal
Regulating valve and flow is arranged in black tail gas combustion air classification technique, the oxygen-supplying amount of reasonable distribution burnings at different levels on air pipe line
(not shown) is counted, accurate control is sent into the flow (i.e. air capacity) of the carbon black tail gas combustion air of each position, will enter low nitrogen
The flow of the carbon black tail gas combustion air on 2 top of burner 1 and adiabatic furnace is reduced to the 80- of total carbon black tail gas combustion air
90% or so, so that carbon black tail gas is burnt in fuel-rich low oxygen area, since carbon black tail gas combustion air coefficient of excess is low in the region
In 100%, the burning velocity and temperature of combustion zone are reduced, and forms reducing atmosphere, inhibits the generation of NOx.With heat insulation furnace
The combustion-supporting sky of carbon black tail gas for remaining carbon black tail gas completely burned is blasted in the combustion-aid air pipe 3 63 of the lower part connection of thorax 2
Gas guarantees the completely burned of carbon black tail gas.It should be noted that the flow of total carbon black tail gas combustion air is according to carbon black tail gas
Flow (i.e. tail gas amount) be adjusted, control adiabatic furnace 2 in total coefficient of excess air 1.05-1.15.
4) combustion product gases come out from adiabatic furnace 2 exchange heat through residual heat using device such as boiler, heat exchanger (not shown) etc.
Temperature afterwards is reduced to 200 DEG C of hereinafter referred to as exhaust gas, by the circulating flue gas blower (figure near offgas outlet (not shown) is arranged in
Do not show) introduce a part of exhaust gas to circulating flue gas delivery pipe 7, respectively via circulating flue gas branch pipe 71 and circulating flue gas endless tube 72 into
Enter low NO 1 and adiabatic furnace 2.
The flow (i.e. exhausted air quantity) of the exhaust gas of low NO 1 is led to by regulating valve and flow via circulating flue gas branch pipe 71
(not shown) interlocked control is counted, the exhaust gas from circulating flue gas branch pipe 71 is in mixture pipe 67 and from combustion-aid air pipe 1
Carbon black tail gas combustion air mixed, avoid circulating flue gas concentrate enter low NO 1 so as to cause regional area oxygen
Concentration is too low and generates flame-out phenomenon.
Introducing portion exhaust gas is into combustion zone, using flue gas recirculating technique, is reduced to utilize flue gas dilution oxygen concentration
Burning velocity and ignition temperature inhibit the generation of NOx.Meanwhile occurring entering combustion zone possibility because of the exhaust gas of low temperature in order to prevent
Caused furnace temperature is relatively low and then the phenomenon that leading to combustion instability, so that chemistry be avoided to increase with heat loss due to combustibles in refuse
Add, circulating flue gas blower preferably uses frequency control, that is, uses the internal circulating load of frequency conversion fan strict control exhaust gas, fires into low nitrogen
The flow of the exhaust gas of burner 1 is about the 30-40% of the flow of total carbon black tail gas combustion air.Entered by circulating flue gas endless tube 72
The exhaust gas of adiabatic furnace 2, for controlling the temperature of subsequent discharge flue gas, so as under the premise of guaranteeing flameholding, as far as possible
Reduction ignition temperature, and then weaken nitrogenous compound oxidation reaction under the high temperature conditions, the generation for reducing fuel type NOx is several
Rate.The flow of this portion carries out feedback control by being set to the thermocouple (not shown) near adiabatic furnace 2, according to reality
Situation adjusts suitable flue gas recirculation amount.
Present embodiment, can be comprehensive due to having used low NO, combustion gas classification, air classification and flue gas recirculation technology
Closing reduces nitrogen oxide emission 50 ~ 60%.
It should be noted that the principle of carbon black tail gas classification is first to feed Some gases, then remaining combustion gas is given again
Enter.Specifically as shown in Figure 1, the carbon black tail gas from carbon black tail gas pipe 1 is with respect to the carbon black tail gas from combustion-aid air pipe 1
Few for combustion air, for example, by combustion-aid air pipe 1 convey carbon black tail gas combustion air be by charcoal black tail
1.2 times of the air equivalent for the carbon black tail gas that tracheae 1 conveys, then, carbon black tail gas pipe 2 52 feeds remaining combustion gas again,
But because being only total charcoal black tail by the carbon black tail gas combustion air that combustion-aid air pipe 1 and combustion-aid air pipe 2 62 input
The 80 ~ 90% of gas combustion air, so, it is superfluous in subrange combustion gas at this time, realize nitrogen oxides reduction.That is, using
Carbon black tail gas classification, can be first with relatively little of combustion gas and relatively more air burning, such air excess, reduction burning temperature
Degree, subsequent remaining combustion gas and relatively little of air burning, combustion gas is excessive, has reducing atmosphere.
The principle of carbon black tail gas combustion air classification is to feed for the first time (by combustion-aid air pipe 1 and combustion-aid air pipe two
62 air fed are thought to feed for the first time) carbon black tail gas combustion air lower than theoretical air requirement, second (by combustion air
The air that pipe 3 63 is fed is thought to feed for the second time) sufficient combustion gas is fed again, combustion gas is burnt completely.Specific to this embodiment party
It is exactly that the air that feeds of combustion-aid air pipe 1 and combustion-aid air pipe 2 62 is added up and seen, into low NO 1 and absolutely in formula
The carbon black tail gas combustion air on the top of hot stove thorax 2 be it is few, only account for the 80-90% of total carbon black tail gas combustion air, belong to deficient
Then oxygen burning realizes completely burned by the air that combustion-aid air pipe 3 63 is sent into.
In addition, it is to be understood that although the flow of carbon black tail gas combustion air is more than carbon black in low NO 1
Combustion air equivalent required for tail gas can contribute to keep burning, but by means of the input of low NO and exhaust gas, energy
Enough oxygen debt burnings for effectively realizing partial flame, and burning velocity and ignition temperature are reduced, to reach the generation for inhibiting NOx.
Technology contents and technical characterstic of the invention have revealed that as above, it being understood, however, that in creative ideas of the invention
Under, those skilled in the art can make various changes and improve to above structure, protect including individually disclose here or requirement
The combination of the technical characteristic of shield, and significantly include other combinations of these features.These deformations and/or combination each fall within this
In technical field involved in inventing, and fall into the protection scope of the claims in the present invention.
Claims (10)
1. a kind of low steady combustion process of nitrogen of carbon black tail gas, it is characterised in that include the following steps:
A) providing, there is the low nitrogen of low NO and adiabatic furnace surely to fire system；
B) high heating value combustion gas is passed through low NO by high heating value fuel gas pipeline, while high heating value gas-fired combustion-supporting air is led to
It crosses combustion air pipeline and is passed through low NO；
C) after after high heating value fuel gas buring and being gradually warming up to carbon black tail gas ignition condition, divide two-way through charcoal black tail carbon black tail gas
Tracheae one and carbon black tail gas pipe two respectively enter the top of low NO and adiabatic furnace, and cut off the confession of high heating value combustion gas
It answers；Three tunnels of carbon black tail gas combustion air point are distinguished through combustion-aid air pipe one, combustion-aid air pipe two and combustion-aid air pipe three simultaneously
Into the lower part of low NO, the top of adiabatic furnace and adiabatic furnace；And system will be surely fired and through outside from low nitrogen
Exhaust gas after heat exchange cooling respectively enters low NO and adiabatic furnace via circulating flue gas branch pipe and circulating flue gas endless tube
Lower part；
Wherein, the carbon black tail gas combustion air from combustion-aid air pipe one and the exhaust gas from circulating flue gas branch pipe are through gaseous mixture
Enter low NO after pipe mixing, circulating flue gas endless tube is arranged in the lower section of combustion-aid air pipe three, passes through carbon black in step c)
The two-way distribution of tail gas, the three tunnels distribution of carbon black tail gas combustion air and the introducing of exhaust gas are so that in low NO
And adiabatic furnace top is in fuel-rich low oxygen combustion atmosphere and forms reducing atmosphere, and adiabatic furnace lower part is in
Combustion gas completely burned state.
2. the low steady combustion process of nitrogen of carbon black tail gas according to claim 1, which is characterized in that in the step c), pass through
The carbon black tail gas combustion air that the combustion-aid air pipe one and the combustion-aid air pipe two convey accounts for total charcoal black tail
The 80~90% of gas combustion air.
3. the low steady combustion process of nitrogen of carbon black tail gas according to claim 2, which is characterized in that in the step c), pass through
The exhausted air quantity that frequency conversion fan control enters the exhaust gas of the circulating flue gas branch pipe is that total carbon black tail gas is combustion-supporting
The 30~40% of the air capacity of air.
4. the low steady combustion process of nitrogen of carbon black tail gas according to claim 2, which is characterized in that described in the step c)
The carbon black tail gas in carbon black tail gas pipe one and the carbon black tail gas pipe two accounts for the 50~70% of total carbon black tail gas respectively
With 30~50%.
5. the low steady combustion process of nitrogen of carbon black tail gas according to claim 4, which is characterized in that pass through the combustion-aid air pipe one
The carbon black tail gas combustion air of conveying is the air equivalent of the carbon black tail gas conveyed by the carbon black tail gas pipe one
1.2 times.
6. the low steady combustion process of nitrogen of carbon black tail gas according to claim 1, which is characterized in that in the confession of the high heating value combustion gas
After should being cut off, the high heating value gas-fired combustion-supporting air continue through the combustion air pipeline input the low NO with
The burning torch of the cooling low NO.
7. the low steady combustion process of nitrogen of carbon black tail gas according to claim 1, which is characterized in that the low NO is bluff body
Burner is inside integrated with high heating value fuel gas buring module and carbon black tail gas combustion module；The adiabatic furnace is set inside it
The multilayer brick of resistance to material or castable are equipped with to keep the temperature.
8. a kind of low nitrogen of carbon black tail gas surely fires system, it is characterised in that including low NO and adiabatic furnace, further includes:
High heating value fuel gas pipeline is connect so that high heating value combustion gas to be sent into low NO with low NO；
Combustion air pipeline is connect so that combustion air being capable of combustion-supporting high heating value combustion gas with low NO；
Carbon black tail gas delivery pipe comprising carbon black tail gas pipe one and carbon black tail gas pipe two, they be separately connected low NO and
The top of adiabatic furnace；
Carbon black tail gas combustion air delivery pipe comprising combustion-aid air pipe one, combustion-aid air pipe two and combustion-aid air pipe three, they
It is separately connected the lower part of low NO, the top of adiabatic furnace and adiabatic furnace；
Circulating flue gas delivery pipe comprising circulating flue gas branch pipe and circulating flue gas endless tube, they be separately connected low NO and
The lower part of adiabatic furnace；
Wherein, combustion-aid air pipe one connects low NO through mixture pipe with circulating flue gas branch pipe, and circulating flue gas endless tube is set
It sets in the lower section of combustion-aid air pipe three.
9. the low nitrogen of carbon black tail gas according to claim 8 surely fires system, which is characterized in that the low NO is bluff body
Burner is inside integrated with high heating value fuel gas buring module and carbon black tail gas combustion module.
10. the low nitrogen of carbon black tail gas according to claim 8 surely fires system, which is characterized in that the adiabatic furnace is in it
Portion is laid with the multilayer brick of resistance to material or castable to keep the temperature.
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| CN201811413423.0A CN109340789B (en) | 2018-11-26 | 2018-11-26 | Carbon black tail gas low-nitrogen stable combustion process and carbon black tail gas low-nitrogen stable combustion system |
| PCT/CN2019/114614 WO2020108223A1 (en) | 2018-11-26 | 2019-10-31 | Low-nitrogen stable combustion process and system for carbon black tail gas |
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| CN201811413423.0A CN109340789B (en) | 2018-11-26 | 2018-11-26 | Carbon black tail gas low-nitrogen stable combustion process and carbon black tail gas low-nitrogen stable combustion system |
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| WO2020108223A1 (en) * | 2018-11-26 | 2020-06-04 | 江苏中圣园科技股份有限公司 | Low-nitrogen stable combustion process and system for carbon black tail gas |
| CN113983477A (en) * | 2021-11-05 | 2022-01-28 | 龙星化工股份有限公司 | Carbon black tail gas segmentation low-nitrogen combustion apparatus |
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Also Published As
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| CN109340789B (en) | 2024-06-14 |
| WO2020108223A1 (en) | 2020-06-04 |
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