CN105650628B - Recirculating fluidized bed oxygen-enriched burning device and its oxygen-enriched combusting air supply method - Google Patents
Recirculating fluidized bed oxygen-enriched burning device and its oxygen-enriched combusting air supply method Download PDFInfo
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- CN105650628B CN105650628B CN201610082997.9A CN201610082997A CN105650628B CN 105650628 B CN105650628 B CN 105650628B CN 201610082997 A CN201610082997 A CN 201610082997A CN 105650628 B CN105650628 B CN 105650628B
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- 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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A kind of air supply method of recirculating fluidized bed oxygen-enriched combusting, include the steps that providing flue gas recycled and oxygen to fluidized bed ontology, the flue gas recycled and oxygen are mixed again after each leading into fluidized bed ontology, and the flue gas recycled and oxygen enter fluidized bed ontology before preheated.And a kind of recirculating fluidized bed oxygen-enriched burning device.The present invention is by using high-temperature oxygen and high temperature flue gas recycled before entering fluidized bed ontology and without mixing, oxygen and flue gas recycled transport respectively in respective pipeline, and flue gas recycled and oxygen is made not to will cause safety accident in transport and mixed process.
Description
Technical field
The present invention relates to circulating fluidized bed technique field, further to recirculating fluidized bed oxygen-enriched burning device and its oxygen-enriched
Burn air supply method.
Background technique
With human society and expanding economy, the influence of production of energy and consumption pattern to environment becomes increasingly conspicuous.And it is warm
Room effect has become one of most severe and most far-reaching challenge of facing mankind.The fossil fuels such as coal produce in combustion
Raw CO2There is important contribution to greenhouse effects.It can be very good using collecting carbonic anhydride and sealing up for safekeeping using technology (CCUS)
Reduce CO2Discharge amount.CCUS technology is broadly divided into pre-combustion capture, traps in burning and post-combustion capture three categories.And it is rich
Oxygen combustion technology has at low cost, easy scale and existing boiler controller system can be transformed etc. as a kind of aflame CCUS technology
Many advantages, it is considered to be most possible large-scale promotion and commercialized CCUS technology.
Oxygen enriched Combustion Technology on Circulating Fluidized Bed Test-facility is the combination of Combustion technology of circulating fluidized and oxygen-enriched combustion technology.It
Inherit that Combustion technology of circulating fluidized combustion adaptive is wide, the high-efficient advantages such as low with NOx emission of limestone desulfurization in furnace.And
And compared to coal-powder boiler, the heat exchange of recirculating fluidized bed endoparticle is violent, but also can use external heat exchanger, so that recycle stream
Change the oxygen-enriched combusting that bed is able to achieve more high oxygen concentration.
High oxygen concentration Oxygen enriched Combustion Technology on Circulating Fluidized Bed Test-facility has the advantage that the contracting of 1) boiler body and subsidiary engine equipment
It is small, substantially reduce the occupied area of whole system；2) flue gas recycled amount reduces, and reduces flue gas in flue gas recycled pipeline
Thermal loss；3) CO in flue gas2Concentration it is high, reduce CO2The cost of purifying and compression.
Oxygen and flue gas recycled are needed in high oxygen concentration recirculating fluidized bed Rich Oxygen Combustion while injecting burner hearth
Air is substituted as burning gases, but it is one of key technical problems that how oxygen and flue gas recycled, which inject burner hearth,.
In traditional recirculating fluidized bed oxygen-enriched combustion system, generally oxygen and flue gas recycled are mixed, mixed gas
Burner hearth is injected after being transported by pipeline.
In recirculating fluidized bed oxygen-enriched combustion system, the oxygen after preheating need to be first sufficiently mixed with flue gas recycled, so
The different location for reinjecting combustion furnace afterwards, oxidant needed for fuel combustion is provided.However in high oxygen concentration recirculating fluidized bed
In oxygen-enriched combustion system, if still first mixed using by the oxygen after preheating and flue gas recycled, mixed gas passes through
Pipeline, which transports, send the air supply mode for reinjecting burner hearth, and there are serious safety problems.Because in flue gas recirculation system, even if
Setting bag filter is dusted processing to flue gas recycled, but small carbon containing of a small amount of partial size is still carried in flue gas
Grain, if preheating after oxygen (about 180 DEG C) and preheating after flue gas (about 200 DEG C) conventionally directly carry out mixing with
Transport, especially in gaseous mixture oxygen concentration reach 50% or it is higher when, a small amount of carbonaceous particles for carrying in flue gas recycled
It is prone to burning of fighting after encountering pure oxygen, once burning in mixed gas pipeline, will is serious accident, not only endangers
And apparatus body, while also threatening to the safety of operations staff.
Currently, oxygen and being followed again to guarantee the safety problem of oxygen and flue gas recycled in mixing and transport process
Ring flue gas usually without preheating, greatly reduces the reasonable distribution of boiler thermodynamic system in this way.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of recirculating fluidized bed oxygen-enriched burning device and oxygen-enriched combusting air feeds
Method, to overcome the problems, such as that oxygen-enriched combusting air feed exists in the prior art.
Based on above-mentioned purpose, the present invention proposes a kind of air supply method of recirculating fluidized bed oxygen-enriched combusting, including to recycle stream
Change the step of bed ontology provides flue gas recycled and oxygen, wherein the flue gas recycled and oxygen each lead into recirculating fluidized bed
Mixed again after ontology, and the flue gas recycled and oxygen enter fluidized bed ontology before preheated.
A kind of specific embodiment according to the present invention, the flue gas recycled carry out smoke filtration before being preheated.
A kind of specific embodiment according to the present invention, the oxygen is respectively to recirculating fluidized bed body lower part different height
On multiple position air feeds.
A kind of specific embodiment according to the present invention, the flue gas recycled are different to recirculating fluidized bed body lower part high
Multiple position air feeds on degree.
A kind of specific embodiment according to the present invention, the oxygen and flue gas recycled are to the identical height of recirculating fluidized bed
Upper circumferentially distributed multiple positions alternately air feed.
A kind of specific embodiment according to the present invention, the oxygen and flue gas recycled are to ciculation fluidized edge of bed height side
To multiple positions alternately air feed of distribution.
A kind of specific embodiment according to the present invention, when circulating fluidized bed combustion, generate high-temperature flue gas, the height
Warm flue gas preheats the flue gas recycled and oxygen by heat exchanger.
A kind of specific embodiment according to the present invention, after the high-temperature flue gas passes through heat exchanger, using dedusting, then
At least it is divided into two parts flue gas, is wherein at least recycled after the purified compression of part of smoke.
A kind of specific embodiment according to the present invention, after the high-temperature flue gas passes through heat exchanger, using dedusting, then
At least it is divided into two parts flue gas, wherein at least part of smoke is the confession of recirculating fluidized bed oxygen-enriched combusting as flue gas recycled
Wind.
Moreover, also a kind of recirculating fluidized bed oxygen-enriched burning device of the present invention, including recirculating fluidized bed ontology, oxygen conveying pipe
Road and circulating flue gas transfer pipeline, which is characterized in that the oxygen delivery pipeline and circulating flue gas transfer pipeline are being connected into circulation
It is not connected to before fluidized bed ontology, and before the oxygen delivery pipeline and circulating flue gas transfer pipeline are connected into recirculating fluidized bed ontology
It exchanges heat by heat exchanger.
A kind of specific embodiment according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, the circulating flue gas
Transfer pipeline is drawn from the top of the recirculating fluidized bed ontology, and the circulating flue gas transfer pipeline passes through heat exchanger and dedusting
Device.
A kind of specific embodiment according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, the circulating flue gas
Transfer pipeline is divided at least two branches, wherein at least one branch connection purifying compressibility.
A kind of specific embodiment according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, the oxygen conveying
Pipeline is divided into multiple branches before accessing recirculating fluidized bed ontology, is located at different height on recirculating fluidized bed body lower part respectively
Multiple position air feeds.
A kind of specific embodiment according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, the circulating flue gas
Transfer pipeline is divided into multiple branches before accessing recirculating fluidized bed ontology, is located at difference on recirculating fluidized bed body lower part respectively
Multiple position air feeds of height.
A kind of specific embodiment according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, the oxygen conveying
Pipeline is divided into multiple oxygen branches before accessing recirculating fluidized bed ontology, and the circulating flue gas transfer pipeline is ciculation fluidized in access
It is divided into multiple circulating flue gas branches, the multiple oxygen branch and multiple circulating flue gas Zhi Luxiang recirculating fluidized bed phases before bed ontology
With multiple positions alternately air feed circumferentially distributed in height.
A kind of specific embodiment according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, the oxygen conveying
Pipeline is divided into multiple oxygen branches before accessing recirculating fluidized bed ontology, and the circulating flue gas transfer pipeline is ciculation fluidized in access
It is divided into multiple circulating flue gas branches, the multiple oxygen branch and multiple circulating flue gas Zhi Luxiang recirculating fluidized bed edges before bed ontology
Multiple positions alternately air feed of short transverse distribution.
By above technical scheme, the beneficial effect of the air supply method of recirculating fluidized bed of the invention and its oxygen-enriched combusting exists
In:
(1) by using high-temperature oxygen and high temperature flue gas recycled before entering premix spout and without mixing, oxygen
Gas and flue gas recycled transport respectively in respective pipeline, make flue gas recycled and oxygen will not in mixed process transporting
At safety accident；
(2) high-temperature flue gas is generated by circulating fluidized bed combustion, then flue gas recycled and oxygen is preheated by heat exchanger,
UTILIZATION OF VESIDUAL HEAT IN can be carried out, the business efficiency of recirculating fluidized bed oxygen-enriched combustion system is increased；
(3) by the dedusting of high-temperature flue gas and further smoke filtration, the carbonaceous particles of small particle in flue gas are reduced,
It avoids carbonaceous particles from encountering oxygen postignition and burns；
(4) by preheating to the oxygen and circulating flue gas that enter recirculating fluidized bed, make boiler thermodynamic system arrangement more
Adduction reason, also improves efficiency of combustion；
(5) by supplying oxygen and circulating flue gas to recirculating fluidized bed body lower part different height and flow is adjustable, therefore,
Can realize flow adjustment according to the burning degree and pollutant load of different parts in recirculating fluidized bed ontology, can it is economical and
Adequately carry out combustion reaction；Additionally by the identical height alternative supply oxygen of fluidized bed ontology and circulating flue gas or difference
Height alternative supply oxygen and circulating flue gas, further improve efficiency of combustion, reduce burning cost.
Detailed description of the invention
Fig. 1 is the recirculating fluidized bed oxygen-enriched combusting air supply method schematic diagram according to the embodiment of the present invention 1.
Fig. 2 is the recirculating fluidized bed oxygen-enriched combusting air supply method schematic diagram according to the embodiment of the present invention 2.
Fig. 3 a is the top cross sectional view of the oxygen of the embodiment of the present invention 2 and the arrangement of flue gas recycled；Fig. 3 b
For the main view schematic cross-section of the arrangement of the oxygen and flue gas recycled of the embodiment of the present invention 2.
Description of symbols:
Burner hearth ontology 1, First air air compartment 2, returning charge wind air compartment 3, material returning device 4, flue gas heat-exchange unit 5, bag filter 6, CO2
Purify compressibility 7, condenser 8, heater 9, smoke filter 10, recirculation blower 11, air-separating plant 12, pressure tune
Save valve group 13, pneumatic control valve 14, flowmeter 15.
Specific embodiment
Technical term in the present invention has following meanings: " oxygen-enriched combusting ", which refers to, utilizes oxygen and flue gas recycled mixing
Substitution air enters the combustion reaction carried out after combustion furnace as oxidant；" oxygen " refers to simple oxygen, or relative to body
The oxygen-containing gas that oxygen concentration is 95% or more for product percentage；" top ", " lower part " are relative concept, and " top " refers to
" top " of fluidized bed ontology, the position have flue gas passing away；" lower part " refers to " lower part " of recirculating fluidized bed ontology,
The position has air intake passage and material returning device.
The principle of the present invention is: by way of reasonably arranging that oxygen and flue gas recycled inject burner hearth, guaranteeing to follow
Under the premise of ring fluidized bed safe and stable operation, realizes that oxygen and flue gas recycled individually transport in respective pipeline, keep away
The gaseous mixture of flue gas recycled and oxygen is exempted from pipeline while having transported, has transported safety and be guaranteed.And by special
Injection arrangement, the mixing of oxygen and flue gas recycled is transferred in combustion furnace and completes, in gas mixing coupling combustion furnace
Fuel and material blending, realize being sufficiently mixed for oxygen and flue gas recycled.After oxygen injection combustion furnace and after fuel contact
Combustion reaction occurs, the flue gas and oxygen that combustion process generates quickly are mixed.And material blending is acute in recirculating fluidized bed
It is strong, it can be uniformly mixed rapidly after oxygen and flue gas recycled injection combustion furnace.Thus the raising of oxygen concentration is preferably resolved
And the preheating of oxygen and flue gas recycled is mixing and transport process bring safety problem to oxygen and flue gas recycled.
The present invention provides a kind of air supply method of recirculating fluidized bed oxygen-enriched combusting, including provides recycling to fluidized bed ontology
Flue gas and oxygen, the flue gas recycled and oxygen are mixed again after being passed through fluidized bed ontology, and described are followed again
Ring flue gas and oxygen are preheated before entering fluidized bed ontology.
A kind of recirculating fluidized bed oxygen-enriched burning device, including fluidized bed ontology, oxygen delivery pipeline and circulation cigarette are also provided
Letter shoot road, the oxygen delivery pipeline and circulating flue gas transfer pipeline are not connected to before being connected into fluidized bed ontology, described
Oxygen delivery pipeline and circulating flue gas transfer pipeline exchange heat before being connected into fluidized bed ontology by heat exchanger.
For preheating method, it is preferred that the flue gas recycled temperature after preheating is 100-200 DEG C, the recycling after preheating
Flue gas enters flue gas surge tank, is then divided into the returning charge wind injection burner hearth of First air, Secondary Air and material returning device.Preferably, oxygen
It is generated by air-separating plant, and is preheated by flue gas heat-exchange unit, the oxygen temperature after preheating is 100-200 DEG C, preheating
Oxygen afterwards enters oxygen surge tank, later from enter recirculating fluidized bed ontology position be divided into from the bottom up First air,
Secondary Air, tertiary air and four wind are directly injected into burner hearth.
It is passed through the position of recirculating fluidized bed ontology for flue gas recycled, is preferably passed through recirculating fluidized bed body bottom portion,
It is also preferred that being passed through from multiple positions of recirculating fluidized bed body lower part different height.Further preferred is passed through First air wind
Room and returning charge wind air compartment, and flow is adjustable.
It is passed through the position of recirculating fluidized bed ontology for oxygen, is preferably passed through recirculating fluidized bed body lower part, further
It is preferably passed through from multiple positions of recirculating fluidized bed ontology different height, flow is adjustable.The multiple position can with it is above-mentioned
Circulating flue gas is passed through position and is circumferentially alternately distributed (along the circumferential direction of recirculating fluidized bed ontology) in identical height, it can
Even 1+2n oxygen injection point of arrangement and 1+2n flue gas recycled decanting point, n are the natural number of 1-5.Alternatively, oxygen and flue gas
It is alternately passed through along short transverse, i.e., is oxygen injection point on sustained height (one layer can be referred to as), thereon in a height
It for flue gas decanting point, then is upwards one layer of oxygen injection point, etc..
By special injection arrangement, the mixing of oxygen and flue gas recycled is transferred in combustion furnace and completes, gas
Fuel and material blending in hybrid coupled combustion furnace, realization oxygen and flue gas recycled are sufficiently mixed.Oxygen injection burning
Combustion reaction occurs after furnace and after fuel contact, the flue gas and oxygen that combustion process generates quickly are mixed.And recycle stream
Change in bed and is blended containing violent material, will be entrained by material after oxygen and flue gas recycled injection combustion furnace, the play of material
Strong blending is beneficial to the uniform mixing of oxygen and flue gas recycled in combustion furnace.
For the source of circulating flue gas, the preferred high temperature containing dust generated after this volumetric combustion of recirculating fluidized bed
Flue gas.The high-temperature flue gas carries out heat supply to the circulating flue gas and oxygen that enter recirculating fluidized bed by heat-exchanger rig.Preferably, institute
It states after flue gas carries out deduster dedusting after exchanging heat, is collected, i.e. CCUS technology, passes through after a part of purified compression of gas
CO after the technique2The CO of high concentration is obtained after compression purification system2Liquid, CO2Concentration is greater than 95%；It is also preferred that after dedusting
Another part gas condensed, heated and filtered, be dehydrated by condensation, reduce water content.Passed through
Filter reduces dust content, and the content of dust is less than 30mg/m in preferably rear flue gas recycled3。
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
Embodiment 1:
Fig. 1 shows the high oxygen concentration recirculating fluidized bed oxygen-enriched combusting air feed system scheme signal of the embodiment of the present invention 1
Figure.The flue gas that boiler body 1 generates carrying dust enters flue gas pipeline, the CO in flue gas2Concentration can reach 90% or more, according to
Secondary to pass through flue gas heat-exchange unit 5 and bag filter 6, the flue gas after dedusting is divided into two parts, and a part enters CO2Purifying compression system
System 7 carries out purifying compressibility, the CO for becoming high concentration after the techniques such as dehydration, purifying and compression2Liquid, can be direct
Using or sealed up for safekeeping, reach CO2The purpose for trapping and sealing up for safekeeping；Another part enters flue gas recycled pipeline, passes through first
It crosses condenser 8 to be carried out dehydrating, obtains dry flue gas recycled of the water content less than 5%；It was formed after continuing through heater 9
Hot flue gas recycled prevents water to be precipitated in pipeline transportational process because of temperature decline；It is then passed through the progress of smoke filter 10
Further dedusting, the content of dust is less than 30mg/m in flue gas recycled3；Flue gas recycled after dehydration dedusting enters to follow again
Ring blower 11 is pressurized, and pressurized flue gas recycled enters flue gas heat-exchange unit 3 and preheated, the flue gas recycled after preheating
Temperature can reach 100-200 DEG C, and be divided into two parts later: wherein most passes through pressure-regulating valve group 13 and pneumatic control valve
Burner hearth is directly injected by the First air air compartment 2 of burner hearth bottom after 14, as First air flue gas recycled.In addition sub-fraction is logical
Material returning device 4 is injected by returning charge wind air compartment 3 after over-voltage force regulating valve group 12 and pneumatic control valve 13, together with recycle stock then
Burner hearth is injected, as returning charge wind.Wherein First air flue gas recycled pressure is 10-20kPa, and the pressure of returning charge wind flue gas recycled
Power is 30-50kPa.Oxygen is generated by air-separating plant 12, is preheated after flue gas heat-exchange unit, the oxygen temperature after preheating
Degree can reach 100-200 DEG C, pass through pressure-regulating valve group 13 and pneumatic control valve 14, after oxygen pressure is adjusted to 5-10kPa,
Burner hearth is injected in the form of Secondary Air, tertiary air and four wind, wherein the height of Secondary Air is 50mm above material inlet.First air
The flow of flue gas recycled, Secondary Air oxygen, tertiary air oxygen and four wind oxygen may be by being arranged on its pipeline
Pneumatic control valve 13 is adjusted, and it is (whole that the recirculating fluidized bed oxygen-enriched combusting that whole oxygen concentration is 40%-70% may be implemented
Oxygen concentration=(the Secondary Air oxygen flow+wind oxygen flow of tertiary air oxygen flow+four times)/(First air flue gas recycled stream
Amount+Secondary Air oxygen flow+wind the oxygen flow of tertiary air oxygen flow+four times)).It is controlled according to burning and pollutant emission
It needs, Secondary Air oxygen flow, tertiary air oxygen flow and four wind oxygen flows pass through under the premise of guaranteeing that total amount is constant
Pneumatic control valve 13 may be implemented arbitrarily to combine.
Embodiment 2:
Fig. 2 shows the signals of the high oxygen concentration recirculating fluidized bed oxygen-enriched combusting air feed system scheme of the embodiment of the present invention 2
Figure.The flue gas that boiler body 1 generates carrying dust enters flue gas pipeline, the CO in flue gas2Concentration can reach 90% or more, according to
Secondary to pass through flue gas heat-exchange unit 5 and bag filter 6, the flue gas after dedusting is divided into two parts, and a part enters CO2Purifying compression system
System 7 carries out purifying compressibility, the CO for becoming high concentration after the techniques such as dehydration, purifying and compression2Liquid, can be direct
Using or sealed up for safekeeping, reach CO2The purpose for trapping and sealing up for safekeeping；Another part enters flue gas recycled pipeline, passes through first
It crosses condenser 8 to be carried out dehydrating, obtains dry flue gas recycled of the water content less than 5%；It was formed after continuing through heater 9
Hot flue gas recycled prevents water to be precipitated in pipeline transportational process because of temperature decline；It is then passed through the progress of smoke filter 10
Further dedusting, the content of dust is less than 30mg/m in flue gas recycled3；Flue gas recycled after dehydration dedusting enters to follow again
Ring blower 11 is pressurized, and pressurized flue gas recycled enters flue gas heat-exchange unit 3 and preheated, the flue gas recycled after preheating
Temperature can reach 100-200 DEG C, be divided into three parts later: after a part is by pressure-regulating valve group 13 and pneumatic control valve 14
It is directly injected into burner hearth by the First air air compartment 2 of burner hearth bottom, as First air flue gas recycled；A part is adjusted by pressure
It is divided into three layers of injection burner hearth after valve group 13 and pneumatic control valve 14, as Secondary Air flue gas recycled；Another part passes through pressure
Pass through the injection material returning device 4 of returning charge wind air compartment 3 after adjusting valve group 13 and pneumatic control valve 14, then injects furnace together with recycle stock
Thorax, as returning charge wind.Oxygen is generated by air-separating plant 12, is preheated after flue gas heat-exchange unit, the oxygen after preheating
Temperature can reach 100-200 DEG C, be divided into two parts later: a part after pressure-regulating valve group 13 and pneumatic control valve 14 by leading to
The First air air compartment 2 for crossing burner hearth bottom is directly injected into burner hearth, and as First air oxygen, First air oxygen and First air recycle cigarette
Gas is arranged on same cross section in the decanting point of First air air compartment 2；Another part passes through pressure-regulating valve group 13 and pneumatic tune
It is divided into three layers of injection burner hearth after section valve 14, as Secondary Air oxygen, Secondary Air oxygen and Secondary Air flue gas recycled are in burner hearth
Decanting point is arranged on same cross section.
Wherein the decanting point arrangement of oxygen and flue gas recycled on First air air compartment and each height of burner hearth is the most key, needs
Guarantee that oxygen and flue gas recycled are quickly uniformly mixed in burner hearth.Fig. 3 a and 3b show a kind of oxygen and flue gas recycled
Arrangement on First air air compartment and each height of burner hearth, wherein solid line represents oxygen, and dotted line represents flue gas recycled.One
On the same section of secondary wind air compartment and burner hearth, the decanting point intersection of oxygen and flue gas recycled is distributed in First air air compartment and burner hearth
On, the decanting point of oxygen and flue gas recycled can intersect according to the size of burner hearth for the arrangement that liquidates and be evenly arranged 1+2n
A oxygen injection point and 1+2n flue gas recycled decanting point (wherein: n=1,2,3).In the vertical direction along burner hearth, oxygen
It is also arranged crosswise with flue gas recycled, such as in a certain vertical direction of burner hearth, First air air compartment is arranged as flue gas recycled
Decanting point, then one layer of Secondary Air is oxygen injection point, and two layers of Secondary Air are flue gas recycled decanting point, and three layers of Secondary Air are oxygen
Decanting point.After pressure-regulating valve group 13, the pressure of First air oxygen and First air flue gas recycled is 10-20kPa, secondary
The pressure of wind oxygen and Secondary Air flue gas recycled is 0-10kPa, and the pressure of returning charge wind flue gas recycled is 30-50kPa.Once
Wind oxygen, First air flue gas recycled, Secondary Air oxygen and Secondary Air flue gas recycled flow may be by being arranged in it
Pneumatic control valve 13 on pipeline is adjusted.It is oxygen-enriched that the recirculating fluidized bed that whole oxygen concentration is 40%-70% may be implemented
Burning (whole oxygen concentration=(First air oxygen flow+Secondary Air oxygen flow)/(First air flue gas recycled flow+secondary
Wind flue gas recycled flow+First air oxygen flow+Secondary Air oxygen flow)).Under the premise of guaranteeing whole oxygen concentration,
First air oxygen concentration (First air oxygen concentration=First air oxygen flow/(First air flue gas recycled flow+First air oxygen
Throughput)) and Secondary Air oxygen concentration (Secondary Air oxygen concentration=Secondary Air oxygen flow/(Secondary Air flue gas recycled flow
+ Secondary Air oxygen flow)) it also may be implemented adjustable, First air oxygen concentration is 21%-50%, and Secondary Air oxygen concentration is
40%-70%.
Comparative experiments:
The test carried out on 50kW recirculating fluidized bed oxygen-enriched combusting experimental rig, compared before traditional burner hybrid mode with
The operational effect of the embodiment of the present invention 1 and 2.Experiments have shown that under the air supply mode of the embodiment of the present invention 1 and 2, the fortune of burner
Row stability, burner hearth are mixed with before traditional burner along temperature uniformity, efficiency of combustion and Pollutant emission concentration of short transverse etc.
Conjunction air supply mode is very nearly the same, and part index number is also advantageous over traditional approach.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (7)
1. a kind of air supply method of recirculating fluidized bed oxygen-enriched combusting, including flue gas recycled and oxygen are provided to recirculating fluidized bed ontology
The step of gas, which is characterized in that
A) flue gas recycled and oxygen are mixed again after each leading into recirculating fluidized bed ontology；
B) oxygen and flue gas recycled replace at least two positions circumferentially distributed in the identical height of recirculating fluidized bed
Carry out air feed；
C) oxygen and the flue gas recycled alternately air feed in burner hearth vertical direction；
D) flue gas recycled and oxygen are preheated before entering fluidized bed ontology；
E) flue gas recycled carries out smoke filtration before being preheated；
F) oxygen is respectively to multiple position air feeds on recirculating fluidized bed body lower part different height, including as First air
Oxygen is to the body bottom portion air feed of recirculating fluidized bed and as Secondary Air oxygen to the body side air feed of recirculating fluidized bed；
G) flue gas recycled is to multiple position air feeds on recirculating fluidized bed body lower part different height, including as primary
Wind circulating flue gas is to the body bottom portion air feed of recirculating fluidized bed, as Secondary Air circulating flue gas to the body side of recirculating fluidized bed
Air feed and as returning charge wind with recycle stock together to recirculating fluidized bed body lower part air feed.
2. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 1, which is characterized in that described ciculation fluidized
High-temperature flue gas is generated when bed burning, the high-temperature flue gas preheats the flue gas recycled and oxygen by heat exchanger.
3. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 2, which is characterized in that the high-temperature flue gas
After heat exchanger, using dedusting, then at least it is divided into two parts flue gas, the wherein at least purified compression of part of smoke
After recycled.
4. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 2, which is characterized in that the high-temperature flue gas
After heat exchanger, using dedusting, then at least it is divided into two parts flue gas, wherein at least part of smoke is as recycling
Flue gas is recirculating fluidized bed oxygen-enriched combusting air feed.
5. a kind of recirculating fluidized bed oxygen-enriched burning device, including the conveying of recirculating fluidized bed ontology, oxygen delivery pipeline, circulating flue gas
Pipeline, oxygen branch and circulating flue gas branch, which is characterized in that
A) oxygen delivery pipeline is not connected to before being connected into recirculating fluidized bed ontology with circulating flue gas transfer pipeline；
B) oxygen delivery pipeline and circulating flue gas transfer pipeline are changed before being connected into recirculating fluidized bed ontology by heat exchanger
Heat；
C) at least two circumferentially distributed in oxygen branch height identical with circulating flue gas Zhi Luxiang recirculating fluidized bed
Bit interleaving carries out air feed；
D) the oxygen branch and circulating flue gas Zhi Luxiang the recirculating fluidized bed alternately air feed in burner hearth vertical direction；
E) oxygen delivery pipeline is divided into multiple oxygen branches before accessing recirculating fluidized bed ontology, respectively to recirculating fluidized bed
It is located at multiple position air feeds of different height on body lower part, including the body bottom portion as First air oxygen to recirculating fluidized bed
Air feed and as Secondary Air oxygen to the body side air feed of recirculating fluidized bed；
F) the circulating flue gas transfer pipeline is divided into multiple circulating flue gas branches before accessing recirculating fluidized bed ontology, respectively to following
It is located at multiple position air feeds of different height on ring fluidized bed body lower part, including as First air circulating flue gas to ciculation fluidized
It is the body bottom portion air feed of bed, same as Secondary Air circulating flue gas to the body side air feed of recirculating fluidized bed and as returning charge wind
Recycle stock is together to recirculating fluidized bed body lower part air feed.
6. recirculating fluidized bed oxygen-enriched burning device according to claim 5, which is characterized in that the circulating flue gas delivery pipe
Road is drawn from the top of the recirculating fluidized bed ontology, and the circulating flue gas transfer pipeline passes through heat exchanger and deduster.
7. recirculating fluidized bed oxygen-enriched burning device according to claim 5, which is characterized in that the circulating flue gas delivery pipe
Road is divided at least two branches, wherein at least one branch connection purifying compressibility.
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| CN106594715A (en) * | 2016-12-05 | 2017-04-26 | 中国科学院工程热物理研究所 | Circulating fluidized bed oxygen-enriched combustion method and device with wet flue gas recycled |
| CN106642087A (en) * | 2016-12-20 | 2017-05-10 | 中国科学院工程热物理研究所 | CO2 zero emission method and CO2 zero emission system achieving interaction between fossil fuel and biomass energy |
| CN110260299B (en) * | 2019-05-29 | 2020-04-03 | 华中科技大学 | Supercritical carbon dioxide coal-fired boiler and multi-stage flue gas recirculation method thereof |
| CN114672328B (en) * | 2022-03-29 | 2023-06-23 | 国能国华(北京)电力研究院有限公司 | Method, system and application for treating organic solid waste |
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