CN105650628A - Oxygen-enriched combustion device of circulating fluidized bed and air supply method for oxygen-enriched combustion thereof - Google Patents
Oxygen-enriched combustion device of circulating fluidized bed and air supply method for oxygen-enriched combustion thereof Download PDFInfo
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- CN105650628A CN105650628A CN201610082997.9A CN201610082997A CN105650628A CN 105650628 A CN105650628 A CN 105650628A CN 201610082997 A CN201610082997 A CN 201610082997A CN 105650628 A CN105650628 A CN 105650628A
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- oxygen
- flue gas
- fluidized bed
- recirculating fluidized
- bed body
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
An air supply method for oxygen-enriched combustion of a circulating fluidized bed comprises the steps of providing recirculating flue gas and oxygen for a fluidized bed body. The recirculating flue gas and the oxygen are led into the fluidized bed body respectively and then mixed. In addition, the recirculating flue gas and the oxygen are both preheated before entering the fluidized bed body. The invention also provides an oxygen-enriched combustion device of the circulating fluidized bed. According to the air supply method, the manner that the high temperature oxygen and the high temperature recirculating flue gas are not mixed before entering the fluidized bed body and are transported in respective pipes is adopted so as to prevent safety accidents during the conveying and mixing processes of the recirculating flue gas and the oxygen.
Description
Technical field
The present invention relates to circulating fluidized bed technique field, further to recirculating fluidized bed oxygen-enriched burning device and oxygen-enriched combusting air supply method thereof.
Background technology
Along with the impact of environment is become increasingly conspicuous by human society and expanding economy, production of energy and consumption pattern. And one of greenhouse effect the severeest and the most far-reaching challenge having become as facing mankind. The CO that the Fossil fuels such as coal produce in combustion2Greenhouse effect is had important contribution. Utilize collecting carbonic anhydride and utilize technology (CCUS) that CO can well be reduced with sealing up for safekeeping2Discharge capacity. CCUS technology is broadly divided into trapping and post-combustion capture three major types in pre-combustion capture, burning. And oxygen-enriched combustion technology is as aflame a kind of CCUS technology, there is cost scale low, easy and the many advantages such as existing boiler controller system can be transformed, it is believed that being most possible large-scale promotion and business-like 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 inherits that Combustion technology of circulating fluidized combustion adaptive is wide, stove sodalime stone desulfuration efficiency high and the advantage such as NOx emission is low. And compared to coal-powder boiler, the endocorpuscular heat exchange of recirculating fluidized bed is violent, but also can adopt external heat exchanger so that recirculating fluidized bed can realize the oxygen-enriched combusting of more high oxygen concentration.
High oxygen concentration Oxygen enriched Combustion Technology on Circulating Fluidized Bed Test-facility has the advantage that 1) the reducing of boiler body and subsidiary engine equipment, it is substantially reduced the floor space of whole system; 2) flue gas recycled amount reduces, and reduces flue gas thermal loss in flue gas recycled pipeline; 3) CO in flue gas2Concentration high, reduce CO2The cost of purification and compression.
High oxygen concentration recirculating fluidized bed Rich Oxygen Combustion needs oxygen and flue gas recycled are injected simultaneously into burner hearth and substitute air as burning gases, but how oxygen and flue gas recycled inject burner hearth is one of key technical problems. In traditional recirculating fluidized bed oxygen-enriched combustion system, generally oxygen and flue gas recycled being mixed, mixed gas injects burner hearth after being transported by pipeline.
In recirculating fluidized bed oxygen-enriched combustion system, the oxygen after preheating and flue gas recycled need to first be sufficiently mixed, and then reinject the diverse location of combustion furnace, it is provided that the oxidant needed for fuel combustion.But in high oxygen concentration recirculating fluidized bed oxygen-enriched combustion system, if still adopting the oxygen after by preheating and flue gas recycled first to mix, mixed gas is transported by pipeline and send the air supply mode reinjecting burner hearth, there is serious safety problem. because in flue gas recirculation system, even if arranging sack cleaner flue gas recycled is carried out dust removal process, but flue gas still carries the carbonaceous particles that a small amount of particle diameter is small, if the oxygen (about 180 DEG C) after preheating and the flue gas (about 200 DEG C) after preheating are conventionally made directly mixing and transport, when particularly in gaseous mixture, oxygen concentration reaches 50% or is higher, the a small amount of carbonaceous particles carried in flue gas recycled is prone to burning of fighting after running into pure oxygen, once gaseous mixture pipeline burns, it will be serious accident, not only jeopardize apparatus body, also the safety of operations staff is threatened simultaneously.
At present, in order to ensure oxygen and the flue gas recycled safety problem in mixing and transport process, oxygen and flue gas recycled generally do not preheat, and so greatly reduce the reasonable distribution of boiler thermodynamic system.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of recirculating fluidized bed oxygen-enriched burning device and oxygen-enriched combusting air supply method, to overcome oxygen-enriched combusting air feed Problems existing in prior art.
Based on above-mentioned purpose, the present invention proposes the air supply method of a kind of recirculating fluidized bed oxygen-enriched combusting, including the step providing flue gas recycled and oxygen to recirculating fluidized bed body, wherein said flue gas recycled and oxygen mix after each leading into recirculating fluidized bed body again, and described flue gas recycled and oxygen enter fluid bed body before all preheat.
A kind of specific embodiments according to the present invention, described flue gas recycled carries out smoke filtration before preheating.
A kind of specific embodiments according to the present invention, described oxygen is respectively to the multiple positions air feed on recirculating fluidized bed body lower part differing heights.
A kind of specific embodiments according to the present invention, described flue gas recycled is to the multiple positions air feed on recirculating fluidized bed body lower part differing heights.
Hocketed air feed in multiple positions circumferentially distributed on the identical height of recirculating fluidized bed by a kind of specific embodiments according to the present invention, described oxygen and flue gas recycled.
Hocketed air feed in multiple positions that ciculation fluidized edge of bed short transverse is distributed by a kind of specific embodiments according to the present invention, described oxygen and flue gas recycled.
A kind of specific embodiments according to the present invention, produces high-temperature flue gas during described CFBC, described high-temperature flue gas preheats described flue gas recycled and oxygen by heat exchanger.
A kind of specific embodiments according to the present invention, described high-temperature flue gas is by, after heat exchanger, then through dedusting, being then at least divided into two parts flue gas, reclaim after the purified compression of at least a part of which part of smoke.
A kind of specific embodiments according to the present invention, described high-temperature flue gas is by, after heat exchanger, then through dedusting, being then at least divided into two parts flue gas, and at least a part of which part of smoke is recirculating fluidized bed oxygen-enriched combusting air feed as flue gas recycled.
And, the present invention is a kind of recirculating fluidized bed oxygen-enriched burning device also, including recirculating fluidized bed body, oxygen delivery pipeline and circulating flue gas transfer pipeline, it is characterized in that, described oxygen delivery pipeline does not connect before being connected into recirculating fluidized bed body with circulating flue gas transfer pipeline, and described oxygen delivery pipeline and circulating flue gas transfer pipeline be connected into recirculating fluidized bed body before carry out heat exchange through heat exchanger.
A kind of specific embodiments according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, described circulating flue gas transfer pipeline is drawn from the top of described recirculating fluidized bed body, and described circulating flue gas transfer pipeline is by heat exchanger and cleaner unit.
A kind of specific embodiments according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, described circulating flue gas transfer pipeline is divided at least two branch roads, at least one of which branch road connection purification compressibility.
A kind of specific embodiments according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, described oxygen delivery pipeline is divided into multiple branch road before accessing recirculating fluidized bed body, is positioned at multiple positions air feed of differing heights respectively on recirculating fluidized bed body lower part.
A kind of specific embodiments according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, described circulating flue gas transfer pipeline is divided into multiple branch road before accessing recirculating fluidized bed body, is positioned at multiple positions air feed of differing heights respectively on recirculating fluidized bed body lower part.
A kind of specific embodiments according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, described oxygen delivery pipeline is divided into multiple oxygen branch road before accessing recirculating fluidized bed body, described circulating flue gas transfer pipeline is divided on multiple circulating flue gas branch road, the plurality of oxygen branch road and multiple circulating flue gas identical height of Zhi Luxiang recirculating fluidized bed before recirculating fluidized bed body circumferentially distributed multiple positions hockets air feed accessing.
A kind of specific embodiments according to the present invention, in recirculating fluidized bed oxygen-enriched burning device, described oxygen delivery pipeline is divided into multiple oxygen branch road before accessing recirculating fluidized bed body, described circulating flue gas transfer pipeline is divided into before recirculating fluidized bed body multiple circulating flue gas branch road, the plurality of oxygen branch road and multiple circulating flue gas Zhi Luxiang recirculating fluidized bed to hocket along multiple positions that short transverse is distributed air feed accessing.
By having the beneficial effects that of above technical scheme, the recirculating fluidized bed of the present invention and the air supply method of its oxygen-enriched combusting:
(1) by adopting high-temperature oxygen and high temperature flue gas recycled not to mix before entering premix spout, oxygen and flue gas recycled transport respectively in respective pipeline, make flue gas recycled and oxygen transport with mixed process in do not result in security incident;
(2) produce high-temperature flue gas by CFBC, again through heat exchanger, flue gas recycled and oxygen are preheated, it is possible to carry out UTILIZATION OF VESIDUAL HEAT IN, add the business efficiency of recirculating fluidized bed oxygen-enriched combustion system;
(3) by the dedusting of high-temperature flue gas and further smoke filtration, the carbonaceous particles of the medium and small particle diameter of flue gas is reduced, it is to avoid carbonaceous particles runs into oxygen postignition and burns;
(4) by the oxygen and circulating flue gas that enter recirculating fluidized bed are preheated, make boiler thermodynamic system arrange more reasonable, also improve efficiency of combustion;
(5) by supplying oxygen and circulating flue gas to recirculating fluidized bed body lower part differing heights and flow is adjustable, therefore, can according to the burning degree of this internal different parts of recirculating fluidized bed and pollutant load, it is achieved flow adjustment, it is possible to economical and carry out combustion reaction fully; Additionally by the identical height alternative supply oxygen of fluid bed body and circulating flue gas or differing heights alternative supply oxygen and circulating flue gas, further increase efficiency of combustion, decrease burning cost.
Accompanying drawing explanation
Fig. 1 is the recirculating fluidized bed oxygen-enriched combusting air supply method schematic diagram of according to embodiments of the present invention 1.
Fig. 2 is the recirculating fluidized bed oxygen-enriched combusting air supply method schematic diagram of according to embodiments of the present invention 2.
Fig. 3 a is the top cross sectional view of the arrangement of the oxygen of the embodiment of the present invention 2 and flue gas recycled;The master that Fig. 3 b is the arrangement of the oxygen of the embodiment of the present invention 2 and flue gas recycled looks schematic cross-section.
Description of reference numerals:
Burner hearth body 1, First air air compartment 2, returning charge wind air compartment 3, material returning device 4, flue gas heat-exchange unit 5, sack cleaner 6, CO2Purification compressibility 7, condenser 8, heater 9, smoke filter 10, recirculation blower 11, air-separating plant 12, pressure-regulating valve group 13, pneumatic control valve 14, effusion meter 15.
Detailed description of the invention
Technical term in the present invention has following implication: " oxygen-enriched combusting " refers to and utilize oxygen and flue gas recycled mixing to substitute the combustion reaction carried out after air enters combustion furnace as oxidant; " oxygen " refers to simple oxygen, or is the oxygen-containing gas of more than 95% relative to oxygen concentration percent by volume; " top ", " bottom " are relative concept, and " top " refers to " top " of fluid bed body, and this position has flue gas passing away; " bottom " refers to " bottom " of recirculating fluidized bed body, and this position has air intake passage and material returning device.
Principles of the invention is: by reasonably arranging that oxygen and flue gas recycled inject the mode of burner hearth, under the premise ensureing recirculating fluidized bed safe and stable operation, realize oxygen and flue gas recycled individually to transport in respective pipeline, the gaseous mixture avoiding flue gas recycled and oxygen transports in pipeline simultaneously, transports safety and is guaranteed. And by special injection arrangement, the mixing of oxygen and flue gas recycled is transferred in combustion furnace and completed, fuel in gas hybrid coupled combustion furnace and material blend, it is achieved being sufficiently mixed of oxygen and flue gas recycled. After oxygen injects combustion furnace, combustion reaction occurring after contacting with fuel, flue gas and oxygen that combustion process produces quickly mix. And material blends acutely in recirculating fluidized bed, oxygen and flue gas recycled inject behind combustion furnace can mix homogeneously rapidly. The safety problem that the preheating of the raising and oxygen and flue gas recycled that thus preferably resolve oxygen concentration brings in mixing and transport process to oxygen and flue gas recycled.
The present invention provides the air supply method of a kind of recirculating fluidized bed oxygen-enriched combusting, including providing flue gas recycled and oxygen to fluid bed body, described flue gas recycled and oxygen mix after passing into fluid bed body again, and described flue gas recycled and oxygen enter fluid bed body before all preheat.
Also provide for a kind of recirculating fluidized bed oxygen-enriched burning device, including fluid bed body, oxygen delivery pipeline and circulating flue gas transfer pipeline, described oxygen delivery pipeline does not connect before being connected into fluid bed body with circulating flue gas transfer pipeline, and described oxygen delivery pipeline and circulating flue gas transfer pipeline carry out heat exchange through heat exchanger before being connected into fluid bed body.
For preheating method, it is preferred that the flue gas recycled temperature after preheating is 100-200 DEG C, the flue gas recycled after preheating enters flue gas surge tank, is then divided into the returning charge wind of First air, secondary wind and material returning device to inject burner hearth. Preferably, oxygen is produced by air-separating plant, and preheat through flue gas heat-exchange unit, oxygen temperature after preheating is 100-200 DEG C, oxygen after preheating enters oxygen surge tank, is divided into First air, secondary wind, tertiary air and four wind from the bottom up from the position entering recirculating fluidized bed body afterwards and is directly injected into burner hearth.
Flue gas recycled is passed into the position of recirculating fluidized bed body, it is preferred that pass into recirculating fluidized bed body bottom portion, it is also preferred that, pass into from multiple positions of recirculating fluidized bed body lower part differing heights.It is preferred that pass into First air air compartment and returning charge wind air compartment, and flow can regulate.
Oxygen is passed into the position of recirculating fluidized bed body, it is preferred that pass into recirculating fluidized bed body lower part, it is preferred that the multiple positions from recirculating fluidized bed body differing heights pass into, flow is adjustable. The plurality of position can with above-mentioned circulating flue gas pass into position on identical height circumferentially (circumference along recirculating fluidized bed body) be alternately distributed, namely can being evenly arranged 1+2n oxygen injection point and 1+2n flue gas recycled decanting point, n is the natural number of 1-5. Or, oxygen alternately passes into along short transverse with flue gas, is namely oxygen injection point on sustained height (can be referred to as a layer), it is on height 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 is completed, and fuel in gas hybrid coupled combustion furnace and material blend, it is achieved being sufficiently mixed of oxygen and flue gas recycled. After oxygen injects combustion furnace, combustion reaction occurring after contacting with fuel, flue gas and oxygen that combustion process produces quickly mix. And recirculating fluidized bed is contained within violent material and blends, oxygen and flue gas recycled will entrained by materials after injecting combustion furnace, and acutely blending of material is beneficial to oxygen and the flue gas recycled Homogeneous phase mixing in combustion furnace.
Source for circulating flue gas, it is preferred that the high-temperature flue gas containing dust produced after deriving from the burning of recirculating fluidized bed body. The circulating flue gas and oxygen that enter recirculating fluidized bed are carried out heat supply by heat-exchanger rig by this high-temperature flue gas. Preferably, after described flue gas carries out cleaner unit dedusting after heat exchange, it is collected after the purified compression of a part of gas, i.e. CCUS technology, by CO after this technique2The CO of high concentration is obtained after compression purification system2Liquid, CO2Concentration is more than 95%; It is also preferred that another part gas after removing dust carries out condensing, heat and filtering, carry out dehydration by condensing, make water content in flue gas reduce. Dust content is made to reduce by filtering, it is preferable that in rear flue gas recycled, the content of dust is less than 30mg/m3��
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Embodiment 1:
Fig. 1 illustrates the high oxygen concentration recirculating fluidized bed oxygen-enriched combusting air feed system scheme schematic diagram of the embodiment of the present invention 1. Boiler body 1 produces to carry the flue gas of dust and enters flue gas pipeline, the CO in flue gas2Concentration can arrive more than 90%, sequentially passes through flue gas heat-exchange unit 5 and sack cleaner 6, and the flue gas after dedusting is divided into two parts, is partly into CO2Purification compressibility 7 is purified compressibility, the CO becoming high concentration after the techniques such as dehydration, purification and compression2Liquid, it is possible to directly utilize or seal up for safekeeping, reach CO2Trapping and the purpose sealed up for safekeeping; Another part enters flue gas recycled pipeline, first passes around condenser 8 and carries out processed, obtains the water content dry flue gas recycled less than 5%; Overheated flue gas recycled is formed, it is prevented that water precipitates out because temperature declines in pipeline transportation after continuing through heater 9; Being then passed through smoke filter 10 and carry out further dedusting, in flue gas recycled, the content of dust is less than 30mg/m3;Flue gas recycled after dehydration dedusting enters recirculation blower 11 and carries out supercharging, flue gas recycled after supercharging enters flue gas heat-exchange unit 3 and preheats, flue gas recycled temperature after preheating can reach 100-200 DEG C, it is divided into two parts afterwards: wherein most is by being directly injected into burner hearth by the First air air compartment 2 of burner hearth bottom after pressure-regulating valve group 13 and pneumatic control valve 14, as First air flue gas recycled. Additionally sub-fraction is by injecting material returning device 4 by returning charge wind air compartment 3 after pressure-regulating valve group 12 and pneumatic control valve 13, then injects burner hearth together with recycle stock, as returning charge wind. Wherein First air flue gas recycled pressure is 10-20kPa, and the pressure of returning charge wind flue gas recycled is 30-50kPa. Oxygen is produced by air-separating plant 12, preheat after flue gas heat-exchange unit, oxygen temperature after preheating can reach 100-200 DEG C, by pressure-regulating valve group 13 and pneumatic control valve 14, after oxygen pressure is adjusted to 5-10kPa, injecting burner hearth with the form of secondary wind, tertiary air and four wind, wherein the height of secondary wind is 50mm above material inlet. First air flue gas recycled, secondary wind oxygen, the pneumatic control valve 13 that the flow of tertiary air oxygen and four wind oxygen may be by being arranged on its pipeline is adjusted, it is possible to achieve overall oxygen concentration is the recirculating fluidized bed oxygen-enriched combusting (overall oxygen concentration=(secondary wind oxygen flow+tertiary air oxygen flow+four times wind oxygen flow)/(First air flue gas recycled flow+secondary wind oxygen flow+tertiary air oxygen flow+four times wind oxygen flow)) of 40%-70%. According to the needs that burning and pollutant emission control, secondary wind oxygen flow, tertiary air oxygen flow and four wind oxygen flows, under ensureing the premise that total amount is constant, can realize arbitrary combination by pneumatic control valve 13.
Embodiment 2:
Fig. 2 illustrates the high oxygen concentration recirculating fluidized bed oxygen-enriched combusting air feed system scheme schematic diagram of the embodiment of the present invention 2. Boiler body 1 produces to carry the flue gas of dust and enters flue gas pipeline, the CO in flue gas2Concentration can arrive more than 90%, sequentially passes through flue gas heat-exchange unit 5 and sack cleaner 6, and the flue gas after dedusting is divided into two parts, is partly into CO2Purification compressibility 7 is purified compressibility, the CO becoming high concentration after the techniques such as dehydration, purification and compression2Liquid, it is possible to directly utilize or seal up for safekeeping, reach CO2Trapping and the purpose sealed up for safekeeping; Another part enters flue gas recycled pipeline, first passes around condenser 8 and carries out processed, obtains the water content dry flue gas recycled less than 5%; Overheated flue gas recycled is formed, it is prevented that water precipitates out because temperature declines in pipeline transportation after continuing through heater 9; Being then passed through smoke filter 10 and carry out further dedusting, in flue gas recycled, the content of dust is less than 30mg/m3; Flue gas recycled after dehydration dedusting enters recirculation blower 11 and carries out supercharging, flue gas recycled after supercharging enters flue gas heat-exchange unit 3 and preheats, flue gas recycled temperature after preheating can reach 100-200 DEG C, it is divided into three parts afterwards: be directly injected into burner hearth in part through after pressure-regulating valve group 13 and pneumatic control valve 14 by the First air air compartment 2 of burner hearth bottom, as First air flue gas recycled; In part through being divided into three layers to inject burner hearth after pressure-regulating valve group 13 and pneumatic control valve 14, as secondary wind flue gas recycled;Another part, by injecting material returning device 4 by returning charge wind air compartment 3 after pressure-regulating valve group 13 and pneumatic control valve 14, then injects burner hearth together, as returning charge wind with recycle stock. Oxygen is produced by air-separating plant 12, preheat after flue gas heat-exchange unit, oxygen temperature after preheating can reach 100-200 DEG C, it is divided into two parts afterwards: be directly injected into burner hearth in part through after pressure-regulating valve group 13 and pneumatic control valve 14 by the First air air compartment 2 of burner hearth bottom, it is arranged on same cross section as First air oxygen, First air oxygen and First air flue gas recycled at the decanting point of First air air compartment 2; Another part, by being divided into three layers to inject burner hearth after pressure-regulating valve group 13 and pneumatic control valve 14, is arranged on same cross section at the decanting point of burner hearth as secondary wind oxygen, secondary wind oxygen and secondary wind flue gas recycled.
Wherein oxygen and the flue gas recycled decanting point on each height of First air air compartment and burner hearth is arranged the most key, it is necessary to ensure oxygen and flue gas recycled quick mix homogeneously in burner hearth. Fig. 3 a and 3b illustrates a kind of oxygen and the flue gas recycled arrangement on each height of First air air compartment and burner hearth, and wherein solid line represents oxygen, and dotted line represents flue gas recycled. On the same cross section of First air air compartment and burner hearth, the decanting point intersection of oxygen and flue gas recycled is distributed on First air air compartment and burner hearth, the decanting point of oxygen and flue gas recycled is the layout that liquidates, size according to burner hearth, can intersect and be evenly arranged 1+2n oxygen injection point and 1+2n flue gas recycled decanting point (wherein: n=1,2,3). In the vertical direction of burner hearth, oxygen and flue gas recycled are also arranged crosswise, 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 wind is oxygen injection point, two layers of secondary wind are flue gas recycled decanting point, and three layers secondary wind is oxygen injection point. After pressure-regulating valve group 13, the pressure of First air oxygen and First air flue gas recycled is 10-20kPa, and the pressure of secondary wind oxygen and secondary wind flue gas recycled is 0-10kPa, and the pressure of returning charge wind flue gas recycled is 30-50kPa. The pneumatic control valve 13 that the flow of First air oxygen, First air flue gas recycled, secondary wind oxygen and secondary wind flue gas recycled may be by being arranged on its pipeline is adjusted. The recirculating fluidized bed oxygen-enriched combusting (overall oxygen concentration=(First air oxygen flow+secondary wind oxygen flow)/(First air flue gas recycled flow+secondary wind flue gas recycled flow+First air oxygen flow+secondary wind oxygen flow)) that overall oxygen concentration is 40%-70% can be realized. Under the premise ensureing overall oxygen concentration, First air oxygen concentration (First air oxygen concentration=First air oxygen flow/(First air flue gas recycled flow+First air oxygen flow)) and secondary wind oxygen concentration (secondary wind oxygen concentration=secondary wind oxygen flow/(secondary wind flue gas recycled flow+secondary wind oxygen flow)) can also realize adjustable, First air oxygen concentration is 21%-50%, and secondary wind oxygen concentration is 40%-70%.
Contrast experiment:
The test carried out on 50kW recirculating fluidized bed oxygen-enriched combusting assay device, compared for the operational effect of hybrid mode and the embodiment of the present invention 1 and 2 before traditional burner. Test shows, under the air supply mode of the embodiment of the present invention 1 and 2, the operation stability of burner, burner hearth are along the temperature homogeneity of short transverse, efficiency of combustion and Pollutant emission concentration etc. all with to mix air supply mode before traditional burner very nearly the same, and part index number is also advantageous over traditional approach.
Particular embodiments described above; the purpose of the present invention, technical scheme and beneficial effect have been further described; it it should be understood that; the foregoing is only specific embodiments of the invention; it is not limited to the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (16)
1. the air supply method of a recirculating fluidized bed oxygen-enriched combusting, including the step providing flue gas recycled and oxygen to recirculating fluidized bed body, it is characterized in that, described flue gas recycled and oxygen mix after each leading into recirculating fluidized bed body again, and described flue gas recycled and oxygen enter fluid bed body before all preheat.
2. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 1, it is characterised in that described flue gas recycled carries out smoke filtration before preheating.
3. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 1, it is characterised in that described oxygen is respectively to the multiple positions air feed on recirculating fluidized bed body lower part differing heights.
4. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 1, it is characterised in that described flue gas recycled is to the multiple positions air feed on recirculating fluidized bed body lower part differing heights.
5. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 1, it is characterised in that hocketed air feed in multiple positions circumferentially distributed on the identical height of recirculating fluidized bed by described oxygen and flue gas recycled.
6. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 1, it is characterised in that hocketed air feed in multiple positions that ciculation fluidized edge of bed short transverse is distributed by described oxygen and flue gas recycled.
7. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 1, it is characterised in that producing high-temperature flue gas during described CFBC, described high-temperature flue gas preheats described flue gas recycled and oxygen by heat exchanger.
8. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 7, it is characterized in that, described high-temperature flue gas is by after heat exchanger, then through dedusting, then at least it is divided into two parts flue gas, reclaims after the purified compression of at least a part of which part of smoke.
9. the air supply method of recirculating fluidized bed oxygen-enriched combusting according to claim 7, it is characterized in that, described high-temperature flue gas is by after heat exchanger, then through dedusting, then being at least divided into two parts flue gas, at least a part of which part of smoke is recirculating fluidized bed oxygen-enriched combusting air feed as flue gas recycled.
10. a recirculating fluidized bed oxygen-enriched burning device, including recirculating fluidized bed body, oxygen delivery pipeline and circulating flue gas transfer pipeline, it is characterized in that, described oxygen delivery pipeline does not connect before being connected into recirculating fluidized bed body with circulating flue gas transfer pipeline, and described oxygen delivery pipeline and circulating flue gas transfer pipeline be connected into recirculating fluidized bed body before carry out heat exchange through heat exchanger.
11. recirculating fluidized bed oxygen-enriched burning device according to claim 10, it is characterised in that described circulating flue gas transfer pipeline is drawn from the top of described recirculating fluidized bed body, and described circulating flue gas transfer pipeline is by heat exchanger and cleaner unit.
12. recirculating fluidized bed oxygen-enriched burning device according to claim 10, it is characterised in that described circulating flue gas transfer pipeline is divided at least two branch roads, at least one of which branch road connection purification compressibility.
13. recirculating fluidized bed oxygen-enriched burning device according to claim 10, it is characterized in that, described oxygen delivery pipeline is divided into multiple branch road before accessing recirculating fluidized bed body, is positioned at multiple positions air feed of differing heights respectively on recirculating fluidized bed body lower part.
14. recirculating fluidized bed oxygen-enriched burning device according to claim 10, it is characterized in that, described circulating flue gas transfer pipeline is divided into multiple branch road before accessing recirculating fluidized bed body, is positioned at multiple positions air feed of differing heights respectively on recirculating fluidized bed body lower part.
15. recirculating fluidized bed oxygen-enriched burning device according to claim 10, it is characterized in that, described oxygen delivery pipeline is divided into multiple oxygen branch road before accessing recirculating fluidized bed body, described circulating flue gas transfer pipeline is divided on multiple circulating flue gas branch road, the plurality of oxygen branch road and multiple circulating flue gas identical height of Zhi Luxiang recirculating fluidized bed before recirculating fluidized bed body circumferentially distributed multiple positions hockets air feed accessing.
16. recirculating fluidized bed oxygen-enriched burning device according to claim 10, it is characterized in that, described oxygen delivery pipeline is divided into multiple oxygen branch road before accessing recirculating fluidized bed body, described circulating flue gas transfer pipeline is divided into before recirculating fluidized bed body multiple circulating flue gas branch road, the plurality of oxygen branch road and multiple circulating flue gas Zhi Luxiang recirculating fluidized bed to hocket along multiple positions that short transverse is distributed air feed accessing.
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