CN109253448A - circulating fluidized bed combustion method - Google Patents
circulating fluidized bed combustion method Download PDFInfo
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- CN109253448A CN109253448A CN201710566859.2A CN201710566859A CN109253448A CN 109253448 A CN109253448 A CN 109253448A CN 201710566859 A CN201710566859 A CN 201710566859A CN 109253448 A CN109253448 A CN 109253448A
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- Prior art keywords
- bed material
- burner hearth
- burner
- gas
- cyclone separator
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Classifications
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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
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
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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
The present invention provides a kind of circulating fluidized bed combustion methods, and the bed material containing metal oxide in burner burner hearth forms emulsion zone by Air Fluidized, in burner hearth bottom, form dilute-phase zone in middle and upper part；Fuel is placed in burner hearth to burn, forms reproducibility environment in emulsion zone, forms oxidative environment in dilute-phase zone；Bed material in emulsion zone is reduced, and the nitrogen oxides in flue gas is reduced into nitrogen in dilute-phase zone later, while bed material itself is reoxidized；And the gas-solid mixture that burner hearth generates enters in cyclone separator, bed material in gas-solid mixture is segregated into the dipleg of cyclone separator, material returning device through burner sends burner hearth back to and participates in next round circulation, and the flue gas in gas-solid mixture is discharged after entering back-end ductwork from the top of cyclone separator.The circulating fluidized bed combustion scheme provided through the invention can reduce the discharge of the nitrogen oxides of flue gas, and denitration efficiency is high, and bed material provided by the invention is cheap, can be recycled.
Description
Technical field
The present invention relates to field of combustion technology in furnace, more particularly to a kind of circulating fluidized bed combustion method.
Background technique
Coal burning is considered as one of the main source of China's atmosphere pollution.Due to the limit of the natural natural endowment of China's energy
System, fire coal will occupy leading position in the future for a long period of time, and in order to solve environmental problem, clean coal burning technology is aobvious
It obtains more important.For circulating fluidized-bed boiler Combustion technology with its high combustion efficiency, fuel tolerance is strong, and it is excellent that pollutant emission is low etc.
Gesture is known as being best one of the clean coal burning technology of commercialization degree in the world.
Circulating fluidized bed boiler uses desulfuration in furnace technology, by the way that limestone particle and SO are added into furnace2Reaction and incite somebody to action
It is removed.Burning in circulating fluid bed boiler temperature is lower, and compared to coal-powder boiler, its nitrogen oxides raw emissions is lower, generally can be straight
Fill the old discharge standard in sufficient China.In recent years, the discharge standard of China's coal-burning boiler is increasingly harsh, circulating fluidized bed boiler
Raw emissions be unable to satisfy new discharge standard mostly, exploitation minimum discharge circulating fluidized-bed boiler Combustion technology becomes when business
It is anxious.SCR (Selective Catalytic Reduction, selective catalytic reduction) denitration technology is used in back-end ductwork
Discharged nitrous oxides can be effectively reduced, but its operating cost is higher and there are problems that the escaping of ammonia.Using SNCR
(Selective Non-Catalytic Reduction, selective non-catalytic reduction) denitration is at low cost, but denitration efficiency compared with
It is low.
Summary of the invention
On the present invention provides a kind of circulating fluidized bed combustion methods to overcome the above problem or at least be partially solved
State problem.
According to an aspect of the invention, there is provided a kind of circulating fluidized bed combustion method, comprises the following steps that:
Bed material containing metal oxide is placed in the burner hearth of burner and is fluidized by air, in the burner hearth
Emulsion zone is formed on bottom, forms dilute-phase zone in the middle and upper part of the burner hearth；
Fuel is placed in the burner hearth and is burnt, reproducibility environment is formed in the emulsion zone, in the dilute-phase zone
Form oxidative environment；
Bed material in the emulsion zone is reduced, it is described be reduced after bed material be fluidized into the dilute-phase zone, and
Redox reaction occurs for the nitrogen oxides in flue gas generated with burning, and the bed material being reduced is reoxidized into metal
Oxide, the nitrogen oxides are reduced into nitrogen；
In the cyclone separator that the gas-solid mixture that the burner hearth generates enters the burner, the gas-solid mixing
Bed material in object is segregated into the dipleg of the cyclone separator, and the material returning device through the burner sends the burner hearth ginseng back to
It is recycled with next round, the flue gas in the gas-solid mixture enters the tail of the burner from the top of the cyclone separator
It is discharged after portion's flue.
Optionally, the bed material includes: metal oxide Fe2O3, one of FeO, CaO or a variety of mixing.
Optionally, the partial size of the bed material is 100~250 microns.
Optionally, the partial size of the fuel is 50~80 microns.
Optionally, the truncation partial size of the cyclone separator is at 80~100 microns.
Optionally, the SO to burn in the flue gas of generation2By the CaO removing in the bed material.
Optionally, the above method further include:
The bed material is supplemented in the burner operational process to maintain system material balance.
The present invention provides a kind of circulating fluidized bed combustion methods, are based on technical solution provided by the invention, in burning
The bed material containing metal oxide in device burner hearth can by Air Fluidized, fuel when burning in the hearth, bed material in furnace
It is reduced in the reducing atmosphere of thorax bottom dense, the nitrogen oxides in flue gas is reduced into nitrogen in dilute-phase zone later, together
When bed material itself be reoxidized.Bed material provided by the invention can be used as desulfurizing agent and denitrfying agent simultaneously, can reduce significantly
SO in boiler raw flue gas2With the discharge of nitrogen oxides, moreover, above-mentioned bed material is put cheap and can be recycled,
And the circulating fluidized bed combustion method simple possible based on above-mentioned bed material, have in fields such as electricity power, chemical industry and metallurgy wide
General application is especially suitable for minimum discharge circulating fluidized bed boiler and uses.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is burner structural schematic diagram according to an embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
The embodiment of the invention provides a kind of circulating fluidized bed combustion methods, comprise the following steps that:
Bed material containing metal oxide is placed in the burner hearth of burner and is fluidized by air, in furnace by step S1
Emulsion zone is formed on the bottom of thorax, forms dilute-phase zone in the middle and upper part of burner hearth；
Step S2, fuel is placed in burner hearth and is burnt, and forms reproducibility environment in emulsion zone, forms oxygen in dilute-phase zone
The property changed environment；
Step S3, the bed material in emulsion zone are reduced, and the bed material after being reduced is fluidized into dilute-phase zone, and with burning
Redox reaction occurs for the nitrogen oxides in the flue gas of generation, and the bed material being reduced is reoxidized into metal oxide, nitrogen
Oxide is reduced into nitrogen；
Step S4, in the cyclone separator that the gas-solid mixture that burner hearth generates enters burner, the gas-solid mixing
Bed material in object is segregated into the dipleg of cyclone separator, and the material returning device through burner sends burner hearth back to and participates in next repeating query
Ring, the flue gas in gas-solid mixture are discharged after the back-end ductwork that the top of the cyclone separator enters burner.
Being in the bed material containing metal oxide in burner burner hearth based on technical solution provided by the invention can be with
By Air Fluidized, when burning in the hearth, bed material is reduced fuel in the reducing atmosphere of burner hearth bottom emulsion zone, later
The nitrogen oxides in flue gas is reduced into nitrogen in dilute-phase zone, while bed material itself is reoxidized.Especially for coal, coke
The burning of charcoal, gasification carbon residue and other nitrogenous fuel, can using circulating fluidized bed combustion method provided in an embodiment of the present invention
While guaranteeing efficiency of combustion, the raw emissions of nitrogen oxides in combustion product gases are significantly reduced, and then can guarantee reducing
Denitration efficiency is promoted while denitration cost.And entire circulating fluidized bed combustion method simple possible, electricity power, chemical industry and
The fields such as metallurgy, which have, to be widely applied, and is especially suitable for minimum discharge circulating fluidized bed boiler and is used.
Fig. 1 is burner schematic diagram used in circulating fluidized bed combustion method process provided in an embodiment of the present invention.
As shown in Figure 1, burner includes burner hearth 1, cyclone separator 2, material returning device 3, back-end ductwork 4.
In embodiments of the present invention, when carrying out burning work, use artificial metal oxide particle as bed material, in burner hearth
By Air Fluidized in 1, burner hearth bottom forms emulsion zone 5, and burner hearth middle and upper part forms dilute-phase zone 6；Fuel is in furnace chamber inner combustion, close
Phase region 5 is because oxygen deficiency forms whole reproducibility environment, in dilute-phase zone 6 because oxygen excessively forms integrated oxidation environment, bed material
It is reduced in burner hearth bottom emulsion zone 5, bed material is sent out after being fluidized into burner hearth middle and upper part dilute-phase zone 6 with the nitrogen oxides in flue gas
Raw redox reaction, bed material is reoxidized into metal oxide, and nitrogen oxides is reduced into nitrogen.What burner hearth 1 generated
Gas-solid mixture enters cyclone separator 2, and bed material is segregated into dipleg, sends burner hearth back to through material returning device 4 and participates in next round circulation,
Flue gas enters back-end ductwork 5 from the top of cyclone separator 2.
Optionally, bed material provided in an embodiment of the present invention may include metal oxide Fe2O3, one of FeO, CaO or
A variety of mixing.Above-mentioned metal oxide is other than the removing to nitrogen oxides and sulfur dioxide plays a positive role, as bed
Material also acts as the positive effectiveness such as the balance for maintaining recycle stock, enhancing heat exchange in itself.
In embodiments of the present invention, desulfurizing agent and denitrfying agent, energy can be used as using the bed material containing metal oxide simultaneously
It is enough to reduce SO in the raw flue gas generated when fuel combustion significantly2With the discharge of nitrogen oxides.Moreover, above-mentioned bed material puts cost
It is cheap and can be recycled.In practical applications, it can be used as long as can reach the material of said effect, the present invention is not done
It limits.
Preferably, the partial size of bed material is preferably 100~250 microns, and the partial size of fuel is preferably 50~80 microns；Whirlwind point
Truncation partial size from device can be set at 80~100 microns, guarantees that bed material can be effectively separated and sends burner hearth back to, and small particle
Flying dust is then taken out of by flue gas.
Further, a certain amount of bed material can also be supplemented in burner operational process to maintain system material flat
Weighing apparatus.
The embodiment of the invention provides a kind of circulating fluidized bed combustion methods, are based on technical solution provided by the invention, place
In the bed material containing metal oxide in burner burner hearth can by Air Fluidized, fuel when burning in the hearth, bed material
Be reduced in the reducing atmosphere of burner hearth bottom emulsion zone, the nitrogen oxides in flue gas is reduced into nitrogen in dilute-phase zone later
Gas, while bed material itself is reoxidized.It, can significantly using circulating fluidized bed combustion method provided in an embodiment of the present invention
Reduce the SO in boiler raw flue gas2With the discharge of nitrogen oxides, and due to avoiding spray ammonia, there is no asking for the escaping of ammonia
Topic.And above-mentioned bed material is cheap, may be implemented to be recycled, so that operating cost is low.And it is based on above-mentioned bed material
Circulating fluidized bed combustion method simple possible, the fields such as electricity power, chemical industry and metallurgy have be widely applied, be especially suitable for
Minimum discharge circulating fluidized bed boiler uses.
Above-described embodiment is described in detail in the following special several preferred embodiments of act.
Embodiment one
It is tested in 3kW circulating fluidized bed combustion equipment.Combustion apparatus is as shown in Figure 1, wherein wherein burner hearth is straight
Diameter is 160mm.Testing fuel is that Indonesia coal blends petroleum coke, and the two mass ratio is 3:1.Bed material uses circulating ash, lime stone, grain
The Fe of shape2O3With FeO mixture.After system reaches stable state, test result are as follows: 889 DEG C of upper furnace freeboard temperature, burner hearth
The oxygen purity of outlet is 3.7%.Discharged nitrous oxides are 41mg/m3。
Comparative example 1
Combustion apparatus used is identical as the combustion apparatus in embodiment one.Test fuel be Indonesia coal blend petroleum coke, two
Person's mass ratio is 3:1.Bed material is conventional bed material, the i.e. mixture of circulating ash, lime stone and quartz sand.Reach stable state to system
Afterwards, test result are as follows: 880 DEG C of upper furnace freeboard temperature, the oxygen purity of furnace outlet is 3.6%.Nitrogen oxides
Discharge is 252mg/m3。
Embodiment two
Combustion apparatus used is identical as the combustion apparatus in embodiment one.Test fuel be Indonesia coal blend petroleum coke, two
Person's mass ratio is 4:1.Bed material in the present embodiment is identical as the bed material in embodiment one.After system reaches stable state, test knot
Fruit are as follows: 856 DEG C of upper furnace freeboard temperature, the oxygen purity of furnace outlet is 2.3%.Discharged nitrous oxides are
29mg/m3。
Comparative example 2
Combustion apparatus used is identical as the combustion apparatus in embodiment one.Test fuel be Indonesia coal blend petroleum coke, two
Person's mass ratio is 4:1.Used bed material is identical with comparative example 1.After system reaches stable state, test result are as follows: on burner hearth
854 DEG C of portion's freeboard temperature, the oxygen purity of furnace outlet is 2.3%.Discharged nitrous oxides are 127mg/m3。
By comparing it is found that being discharged when being burnt using circulating fluidized bed combustion method provided by the invention
Amount of nitrogen oxides can be substantially reduced compared to the amount of nitrogen oxides that traditional combustion method is discharged.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that implementation of the invention
Example can be practiced without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this specification.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of the various inventive aspects,
Above in the description of exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the disclosed method should not be interpreted as reflecting the following intention: i.e. required to protect
Shield the present invention claims features more more than feature expressly recited in each claim.More precisely, as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim itself
All as a separate embodiment of the present invention.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments mean it is of the invention
Within the scope of and form different embodiments.For example, in detail in the claims, embodiment claimed it is one of any
Can in any combination mode come using.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows
Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all such other variations or modifications.
Claims (7)
1. a kind of circulating fluidized bed combustion method, comprises the following steps that:
Bed material containing metal oxide is placed in the burner hearth of burner and is fluidized by air, in the bottom of the burner hearth
Emulsion zone is formed, forms dilute-phase zone in the middle and upper part of the burner hearth；
Fuel is placed in the burner hearth and is burnt, reproducibility environment is formed in the emulsion zone, is formed in the dilute-phase zone
Oxidative environment；
Bed material in the emulsion zone is reduced, it is described be reduced after bed material be fluidized into the dilute-phase zone, and with combustion
Redox reaction occurs for the nitrogen oxides burnt in the flue gas generated, and the bed material being reduced is reoxidized into metal and aoxidizes
Object, the nitrogen oxides are reduced into nitrogen；
In the cyclone separator that the gas-solid mixture that the burner hearth generates enters the burner, in the gas-solid mixture
Bed material be segregated into the dipleg of the cyclone separator, the material returning device through the burner is sent back under the burner hearth participates in
One wheel recycles, and the flue gas in the gas-solid mixture enters the tail portion cigarette of the burner from the top of the cyclone separator
It is discharged behind road.
2. the method according to claim 1, wherein the bed material includes: metal oxide Fe2O3、FeO、CaO
One of or a variety of mixing.
3. bed material according to claim 1, wherein the partial size of the bed material is 100~250 microns.
4. the method according to claim 1, wherein the partial size of the fuel is 50~80 microns.
5. the method according to claim 1, wherein the truncation partial size of the cyclone separator is micro- 80~100
Rice.
6. according to the method described in claim 2, it is characterized in that, burning generate flue gas in SO2By in the bed material
CaO removing.
7. method according to claim 1-6, which is characterized in that further include:
The bed material is supplemented in the burner operational process to maintain system material balance.
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| CN201710566859.2A CN109253448B (en) | 2017-07-12 | 2017-07-12 | Circulating fluidized bed combustion method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594740A (en) * | 2019-11-08 | 2019-12-20 | 中国科学院广州能源研究所 | Micro-scale intensified combustion method for increasing oxygen ion concentration in flame |
| CN110779010A (en) * | 2019-10-14 | 2020-02-11 | 华中科技大学 | Fluidized bed composite bed material with characteristics of slag bonding resistance and low NOx content |
| CN111947171A (en) * | 2019-05-16 | 2020-11-17 | 新淳(上海)环保科技有限公司 | Denitration method for circulating fluidized bed boiler |
| CN114797872A (en) * | 2022-04-29 | 2022-07-29 | 清华大学 | Medium-low temperature additive and process for jointly removing nitrous oxide and NOx in furnace |
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| CN109253448B (en) | 2020-05-22 |
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