CN112944335A - Oxygen-enriched combustor suitable for degree of depth peak regulation - Google Patents
Oxygen-enriched combustor suitable for degree of depth peak regulation Download PDFInfo
- Publication number
- CN112944335A CN112944335A CN202110378139.XA CN202110378139A CN112944335A CN 112944335 A CN112944335 A CN 112944335A CN 202110378139 A CN202110378139 A CN 202110378139A CN 112944335 A CN112944335 A CN 112944335A
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- Prior art keywords
- pipe
- oxygen
- secondary air
- combustor
- air
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000001301 oxygen Substances 0.000 title claims abstract description 114
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 114
- 238000002485 combustion reaction Methods 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 26
- 239000003245 coal Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- JAQXDZTWVWLKGC-UHFFFAOYSA-N [O-2].[Al+3].[Fe+2] Chemical compound [O-2].[Al+3].[Fe+2] JAQXDZTWVWLKGC-UHFFFAOYSA-N 0.000 claims description 4
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 239000000446 fuel Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses an oxygen-enriched burner suitable for deep peak regulation, wherein a central oxygen pipe is arranged in the center of the burner, a primary air powder pipe is concentrically arranged on the outer layer of the central oxygen pipe, a secondary oxygen pipe is arranged on the outer layer of the primary air powder pipe, an inner secondary air pipe is vertically arranged on the secondary oxygen pipe, inner secondary air entering from the inner secondary air pipe and oxygen in the secondary oxygen pipe are mixed and then enter the burner through a pipeline, a blocker is arranged at the outlet of the secondary oxygen pipe, an outer secondary air pipe is arranged on the outer layer of the inner secondary air pipe, and a swirler is arranged at the outlet of the outer secondary air pipe. According to the invention, the introduction of oxygen enrichment is stopped under the conventional operation state of the unit, the original stable combustion is maintained, and the oxygen enrichment is introduced for supporting combustion when the unit enters the deep peak regulation state, so that the problem of unstable combustion under the low-load operation when the boiler participates in the deep peak regulation can be solved, the problems of burner nozzle damage caused by high temperature under the oxygen enrichment combustion, NO increase caused by high oxygen concentration and the like are avoided, and the flexibility of participating in the peak regulation of the thermal power unit is improved.
Description
Technical Field
The invention relates to the technical field of high-efficiency combustion of pulverized coal boilers, in particular to an oxygen-enriched combustor mainly suitable for deep peak shaving of a unit.
Background
In recent years, the ratio of new energy power generation is increased year by year, the operating environment of a thermal power generating unit is more and more changeable, and the thermal power generating unit mainly serves as a peak regulation unit to participate in operation. Therefore, how to enable the boiler burner to stably burn when the unit participates in peak shaving on the premise of ensuring the safety of equipment becomes a research focus at the present stage. The oxygen-enriched combustion technology can accelerate fuel combustion, obviously improve flame temperature, avoid unstable combustion under low-load operation and effectively solve the problems. However, the oxyfuel combustion technology still has some problems to be solved, for example, the local heat load is high, and the burner nozzle is easy to burn out; high oxygen concentration and high flame temperature, and is easy to form thermal NO and the like. If the structure of the oxygen-enriched combustor can be improved, the heat-resistant and wear-resistant material is selected during design, and the desulfurization and denitrification technology is considered, the economy and safety of the coal-fired unit can be further improved when the coal-fired unit participates in deep peak shaving, the service life of the unit is prolonged, and the oxygen-enriched combustor has great significance for energy conservation and emission reduction work in China.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an oxygen-enriched combustor suitable for deep peak regulation, which can be used as a combustor for daily operation in a conventional operation state of a unit; under the condition that the unit participates in deep peak shaving, the combustor can effectively solve the unstable combustion phenomenon of the boiler under low load, avoid flameout of the boiler due to low-load operation, give consideration to the problem that NO emission exceeds standard during oxygen-enriched high-temperature combustion, further improve the flexibility of the unit when participating in deep peak shaving, and prolong the service life of the unit.
The invention is realized by adopting the following technical scheme:
the utility model provides an oxygen boosting combustor suitable for degree of depth peak regulation, central oxygen hose arranges in the center of combustor, and the outer layer is arranged once wind powder pipe with one heart, and the secondary oxygen pipe is arranged to the outer layer of once wind powder pipe, and interior secondary air pipe arranges perpendicularly in the secondary oxygen pipe, and the interior overgrate air that gets into by interior secondary air pipe mixes a pipeline of share and gets into the combustor after with the oxygen in the secondary oxygen pipe, and the obstructor is arranged in the export of secondary oxygen pipe, and the outer secondary air pipe is arranged to the outer layer of interior secondary air pipe, and the export of outer secondary air pipe is equipped with the swirler.
The invention is further improved in that a central oxygen pipe is arranged in the center of the burner, and oxygen enters the burner mainly through the primary oxygen pipe.
The invention is further improved in that the primary air powder pipe is concentrically arranged on the outer layer of the central oxygen pipe, and the pipeline is longer than the central oxygen pipe, and the primary air powder enters the combustor through the pipeline.
The invention is further improved in that the secondary oxygen pipe is concentrically arranged on the outer layer of the primary air powder pipe, the pipeline is longer than the primary air powder pipe, and oxygen enters the combustor through the secondary oxygen pipe.
The invention is further improved in that the inner secondary air pipe is vertically arranged on the secondary oxygen pipe, and the inner secondary air and the oxygen in the secondary oxygen pipe are mixed and then enter the combustor through a pipeline.
The invention is further improved in that a barrier is arranged at the outlet of the secondary oxygen pipe, and the mixed gas of oxygen and secondary air can be subdivided into 8 circular gas flows entering the combustor.
A further development of the invention is that the outer secondary air duct is arranged at the outer layer of the inner secondary air duct and that the duct is longer than the inner secondary air duct.
The invention is further improved in that the cyclone is arranged at the outlet of the outer secondary air pipe, so that secondary air can generate rotating airflow to enter the combustor.
The invention is further improved in that the burner pipe, the baffle and the swirl plate are made of heat-resistant and wear-resistant aluminum-iron oxide alloy.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the invention provides an oxygen-enriched combustor suitable for deep peak regulation, which is a structure that a central oxygen pipe, a primary air powder pipe, a secondary oxygen pipe, an inner secondary air pipe and an outer secondary air pipe are arranged in a sleeve way and are arranged in a staggered way. Oxygen enters the combustor through the central oxygen pipe, and is firstly mixed and combusted with the primary air powder pipe, so that the fuel is ignited in advance to form on-duty flame, a stable combustion state is ensured, at the moment, the fuel is still in an incomplete combustion state due to lack of sufficient oxygen, and generation of fuel type NO is inhibited; the other part of oxygen is mixed with the inner secondary air through the secondary oxygen pipe and enters the combustor, and the position of the oxygen is deeper, so that staged combustion inside the combustor is realized, and the generation of thermal NO is effectively inhibited; the arrangement of the obstructer enables the mixed airflow of the secondary oxygen and the inner secondary air to be subdivided into 8 airflows, so that the uniformity of combustion flame is ensured, and the problems of combustion equipment damage, NO generation and the like caused by local overtemperature are avoided; the outer secondary air enters the combustor through a deeper outer layer pipeline, and forms a certain rotating airflow through the swirler, so that the entrainment capacity of the secondary air is improved, the disturbance and backflow of a combustion area are enhanced, and the burnout of pulverized coal is promoted; the pipeline, the obstructor and the rotational flow plate of the burner are all made of heat-resistant and wear-resistant aluminum oxide iron alloy, so that the problems of equipment damage and the like caused by high temperature under the oxygen-enriched combustion condition are solved. Compared with other existing oxygen-enriched burners, the burner has good flame uniformity, is more favorable for the stability of a combustion state, can realize staged combustion, further inhibits the generation of NO, has stronger entrainment capacity by external secondary air, and has high pulverized coal burnout rate. The operation is stable under the low-load operation, and the flexibility of the thermal power generating unit in participating in peak shaving can be improved.
Drawings
FIG. 1 is a cross-sectional view of an oxycombustion burner suitable for deep peaking in accordance with the present invention.
FIG. 2 is a diagram of the port arrangement of an oxycombustion burner suitable for deep peaking in accordance with the present invention.
Description of reference numerals:
1 is a central oxygen pipe, 2 is a primary air powder pipe, 3 is a secondary oxygen pipe, 4 is an inner secondary air pipe, 5 is a blocker, 6 is an outer secondary air pipe, and 7 is a swirler.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the oxygen-enriched burner suitable for deep peak shaving provided by the invention comprises a central oxygen pipe 1, a primary air powder pipe 2, a secondary oxygen pipe 3, an inner secondary air pipe 4, a blocker 5, an outer secondary air pipe 6 and a swirler 7; the central oxygen pipe 1 is arranged at the center of the burner, the outer layer of the central oxygen pipe is concentrically provided with a primary air powder pipe 2, the outer layer of the primary air powder pipe is provided with a secondary oxygen pipe 3, an inner secondary air pipe 4 is vertically arranged on the secondary oxygen pipe, the inner secondary air entering from the inner secondary air pipe and the oxygen in the secondary oxygen pipe are mixed and then enter the burner through a shared pipeline, the outlet of the secondary oxygen pipe is provided with a blocker 5, the outer layer of the inner secondary air pipe is provided with an outer secondary air pipe 6, and the outlet of the outer secondary air pipe is provided with a swirler 7.
The invention arranges an oxygen-enriched pipeline in the center of the burner, and oxygen mainly enters the burner through a central oxygen pipe, so the improvement can provide oxygen provided at the initial stage of combustion, form on-duty flame and ensure the stability of the combustion state.
The primary air powder pipe is concentrically arranged on the outer layer of the central oxygen pipe, and is longer than the central oxygen pipe, so that the improvement can ensure that oxygen and coal powder are ignited and combusted in advance, an independent reduction combustion state is formed, and the generation of fuel type NO is inhibited.
The outer layer of the primary air powder pipe is provided with the secondary oxygen pipe, the position vertical to the secondary oxygen pipe is provided with the inner secondary air pipe, the secondary oxygen and the inner secondary air share one pipeline to enter the combustor, and the pipeline is longer than the primary air powder pipe.
The invention arranges the obstructer at the outlet of the secondary oxygen pipe, and the improvement can subdivide the mixed gas of oxygen and secondary air into 8 strands of circular gas flows to enter the burner, thereby ensuring the uniformity of flame and avoiding the problems of combustion equipment damage, NO generation and the like caused by uneven flame temperature.
According to the invention, the outer secondary air pipe is arranged on the outer layer of the inner secondary air pipe, the pipe is longer than the inner secondary air pipe, and the swirler is arranged at the outlet of the outer secondary air pipe, so that the improvement can form the outer secondary air flow with strong rotation, the entrainment capacity of the secondary air is improved, the disturbance and backflow of a combustion area are enhanced, and the burnout of pulverized coal is promoted.
The pipeline, the obstructor and the rotational flow plate of the burner are all made of heat-resistant and wear-resistant aluminum oxide iron alloy, so that the problems of equipment damage and the like caused by high temperature under the oxygen-enriched combustion condition can be solved.
When the air-conditioning unit works, under the normal operation state of the unit, the inlet valves of the central oxygen pipe and the secondary oxygen pipe are closed, the introduction of oxygen is stopped, the supply of primary air powder, inner secondary air and outer secondary air under the conventional operation is maintained, and the combustor stably burns; when the unit enters a peak shaving operation state, the load is low and fluctuates to a certain extent, the inlet valves of the central oxygen pipe and the secondary oxygen pipe are opened, oxygen is introduced and the opening degrees of the inner secondary air door and the outer secondary air door are adjusted in a matched mode, so that the combustor enters a stable oxygen-enriched combustion state, and the load change is responded quickly and stably on the premise that the unit is guaranteed to operate safely.
Claims (10)
1. An oxygen-enriched combustor suitable for deep peak regulation is characterized by comprising a central oxygen pipe (1), a primary air powder pipe (2), a secondary oxygen pipe (3), an inner secondary air pipe (4), a blocker (5), an outer secondary air pipe (6) and a swirler (7);
center oxygen hose (1) is arranged in the center of combustor, its outer layer is arranged once wind powder pipe (2) with one heart, secondary oxygen pipe (3) are arranged to the skin of once wind powder pipe, interior secondary air pipe (4) are arranged perpendicularly in secondary oxygen pipe, the interior overgrate air that gets into by interior overgrate air pipe mixes a pipeline entering combustor after the oxygen in the back with the secondary oxygen pipe, obstructor (5) are arranged in the export of secondary oxygen pipe, outer overgrate air pipe (6) are arranged to the skin of interior overgrate air pipe, swirler (7) are equipped with in the export of outer overgrate air pipe.
2. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: a central oxygen pipe (1) is arranged in the center of the burner, and oxygen mainly enters the burner through the primary oxygen pipe.
3. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: the primary air powder pipe (2) is concentrically arranged on the outer layer of the central oxygen pipe, and the pipeline is longer than the central oxygen pipe (1), and primary air powder enters the combustor through the pipeline.
4. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: the secondary oxygen pipe (3) is concentrically arranged on the outer layer of the primary air powder pipe, and the pipeline is longer than the primary air powder pipe (2), and oxygen enters the combustor through the secondary oxygen pipe.
5. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: the inner secondary air pipe (4) is vertically arranged on the secondary oxygen pipe, and the inner secondary air and the oxygen in the secondary oxygen pipe are mixed and then enter the combustor through a pipeline.
6. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: the obstruction (5) is arranged at the outlet of the secondary oxygen pipe and can subdivide the mixed gas of oxygen and secondary air into 8 circular gas flows entering the combustor.
7. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: the outer secondary air duct (6) is arranged at the outer layer of the inner secondary air duct and the duct is longer than the inner secondary air duct (4).
8. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: the cyclone (7) is arranged at the outlet of the outer secondary air pipe and can enable secondary air to generate rotating airflow to enter the combustor.
9. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: the pipeline, the obstruction and the rotational flow plate of the burner are all made of heat-resistant and wear-resistant aluminum oxide iron alloy.
10. An oxycombustion burner adapted for deep peaking according to claim 1, characterized in that: under the normal operation state, closing the inlet valves of the central oxygen pipe and the secondary oxygen pipe, and stopping introducing oxygen; and under the deep peak regulation state, opening inlet valves of the central oxygen pipe and the secondary oxygen pipe, introducing oxygen for supporting combustion, and enabling the combustor to enter an oxygen-enriched combustion state to strengthen pulverized coal combustion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110378139.XA CN112944335A (en) | 2021-04-08 | 2021-04-08 | Oxygen-enriched combustor suitable for degree of depth peak regulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110378139.XA CN112944335A (en) | 2021-04-08 | 2021-04-08 | Oxygen-enriched combustor suitable for degree of depth peak regulation |
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| Publication Number | Publication Date |
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| CN112944335A true CN112944335A (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110378139.XA Pending CN112944335A (en) | 2021-04-08 | 2021-04-08 | Oxygen-enriched combustor suitable for degree of depth peak regulation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659103A (en) * | 2022-04-11 | 2022-06-24 | 西安热工研究院有限公司 | Flue gas recirculation oxygen boosting combustor suitable for degree of depth peak regulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012928A (en) * | 2007-02-07 | 2007-08-08 | 鞠胤红 | Smokeless coal gasification micro grease gun igniting pulverized coal burner |
| CN101825278A (en) * | 2010-05-28 | 2010-09-08 | 华中科技大学 | Oxygen-rich combustor |
| EP2500645A1 (en) * | 2011-03-16 | 2012-09-19 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Oxygen-fired low-NOx gas burner and combustion method |
| CN103615717A (en) * | 2013-10-24 | 2014-03-05 | 中国计量学院 | Novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor |
| CN105627328A (en) * | 2016-03-17 | 2016-06-01 | 北京建筑材料科学研究总院有限公司 | Cement kiln solid waste disposal oxygen-enriched combustor |
| CN111928235A (en) * | 2020-09-01 | 2020-11-13 | 国电重庆恒泰发电有限公司 | Oxygen-enriched low-nitrogen burner of boiler |
-
2021
- 2021-04-08 CN CN202110378139.XA patent/CN112944335A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012928A (en) * | 2007-02-07 | 2007-08-08 | 鞠胤红 | Smokeless coal gasification micro grease gun igniting pulverized coal burner |
| CN101825278A (en) * | 2010-05-28 | 2010-09-08 | 华中科技大学 | Oxygen-rich combustor |
| EP2500645A1 (en) * | 2011-03-16 | 2012-09-19 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Oxygen-fired low-NOx gas burner and combustion method |
| CN103615717A (en) * | 2013-10-24 | 2014-03-05 | 中国计量学院 | Novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor |
| CN105627328A (en) * | 2016-03-17 | 2016-06-01 | 北京建筑材料科学研究总院有限公司 | Cement kiln solid waste disposal oxygen-enriched combustor |
| CN111928235A (en) * | 2020-09-01 | 2020-11-13 | 国电重庆恒泰发电有限公司 | Oxygen-enriched low-nitrogen burner of boiler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659103A (en) * | 2022-04-11 | 2022-06-24 | 西安热工研究院有限公司 | Flue gas recirculation oxygen boosting combustor suitable for degree of depth peak regulation |
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Application publication date: 20210611 |
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