CN114777114A - Deep low-oxygen combustion system for pulverized coal - Google Patents
Deep low-oxygen combustion system for pulverized coal Download PDFInfo
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- CN114777114A CN114777114A CN202210416109.8A CN202210416109A CN114777114A CN 114777114 A CN114777114 A CN 114777114A CN 202210416109 A CN202210416109 A CN 202210416109A CN 114777114 A CN114777114 A CN 114777114A
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- pulverized coal
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- 239000003245 coal Substances 0.000 title claims abstract description 64
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 53
- 239000001301 oxygen Substances 0.000 title claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003546 flue gas Substances 0.000 claims abstract description 40
- 238000000605 extraction Methods 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 41
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 229910021529 ammonia Inorganic materials 0.000 abstract description 8
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008021 deposition Effects 0.000 abstract description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004202 carbamide Substances 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 12
- 238000001816 cooling Methods 0.000 description 7
- 239000000779 smoke Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 3
- 240000004282 Grewia occidentalis Species 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
-
- 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
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- 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
-
- 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
- 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
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- 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
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
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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 a pulverized coal deep low-oxygen combustion system which comprises a boiler flue gas extraction fan and an over-fire air nozzle arranged above a main burner of a mixer boiler; an inlet of a boiler flue gas extraction fan is connected with a tail flue of a boiler, a pulverized coal burner nozzle is arranged at the middle lower part of a main boiler burner, and a secondary air nozzle is arranged at the top of the main boiler burner; the secondary air nozzle and the over-fire air nozzle are connected with a first inlet of the mixer through a hot air pipeline, an outlet of a boiler flue gas extraction fan is connected with a second inlet of the mixer, a cold air pipeline is connected with a third inlet of the mixer, an outlet of the mixer is connected with an inlet of a coal mill, and an outlet of the coal mill is connected with a nozzle of a pulverized coal burner. The invention obviously reduces the risk of high-temperature corrosion of the water-cooled wall; meanwhile, after the emission of the initial nitrogen oxides is effectively controlled, the ammonia spraying amount of the SCR system can be greatly reduced, the using amount of liquid ammonia or urea is saved, and the risk of ammonia bisulfate deposition and blockage of the air preheater caused by ammonia escape can be reduced.
Description
Technical Field
The invention belongs to the technical field of pulverized coal boilers in power stations, and particularly relates to a pulverized coal deep low-oxygen combustion system which can effectively control the generation of initial nitric oxides during pulverized coal combustion and reduce the NOx emission of a boiler.
Background
At present, the pollutant control of coal-fired boiler generator sets in China reaches the international leading level, and most coal-fired thermal generator sets realize ultra-clean emission, namely the concentration of nitrogen oxides does not exceed 50mg/Nm under the condition that the reference oxygen content is 6 percent3The concentration of sulfur dioxide is not more than 35mg/Nm3The smoke concentration is not more than 5mg/Nm3. The main technologies for controlling nitrogen oxides include fuel-staged low-nitrogen combustion, air-staged low-nitrogen combustion, and post-combustion denitration technology (SCR technology).
The existing air classification low-nitrogen combustion finishes the combustion process of pulverized coal fuel by stages, and mainly comprises two types: (1) and deflecting the secondary air jet axis to a water cooling wall by a certain angle or controlling the internal secondary air and the external secondary air to form radial staged combustion of primary air pulverized coal airflow and the external secondary air. (2) The position far away from the upper part of the main burner is provided with an over-fire air nozzle which feeds combustion-supporting air into the furnace in stages in an over-fire stage, so that the combustion process is carried out in stages along the smoke flow direction of the hearth. At present, most coal-fired boiler units adopt the two air classification low-nitrogen combustion technologies. At present, the common air classification low-nitrogen combustion does not realize primary air low oxygen, and the primary air rate is higher due to the requirement of a powder preparation system, so that nitrogen oxides generated by the initial combustion of pulverized coal cannot be effectively controlled, and the concentration of the nitrogen oxides can be reduced only by the lower secondary air rate and the higher overfire air rate of a main combustion area, so that the serious anoxic reducing atmosphere in the main combustion area and a reduction area thereof is caused, the high-temperature corrosion of a water wall is serious, and the problem of hearth slagging is easily caused. The strong reducing atmosphere in the water-cooled wall surface area under the low-nitrogen combustion technology is an important reason for causing serious high-temperature corrosion of the water-cooled wall of the existing coal-fired boiler. Secondly, the common defects of the technology are that the main combustion area is lack of oxygen due to high over-fire air rate, so that the problems of combustion delay, flame center shift upwards, hearth outlet smoke temperature rise, slag bonding of the screen superheater, over-temperature of a high-temperature heating surface and the like can be caused. Moreover, the separated over-fire air technique causes insufficient pressure of a secondary air box of the burner and unsatisfactory aerodynamic field, so that the burning loss phenomenon of the burner occurs sometimes. For a cyclone burner boiler, when the opening degree of an air door at the inlet of a burner bellows is the same, the cooling air quantity of internal and external secondary air is reduced by more than 20 percent after the over-fire air technology is adopted. By applying the separated over-fire air technology, the differential pressure between the central cooling air and the hearth is reduced to 0-300 Pa from more than 400Pa, the corresponding central cooling air quantity is reduced by about 1/2, and the cooling effect and the destructive effect of the central cooling air quantity on a central backflow area are weakened by about 50%. For the spare combustor under the working condition of low-load operation, the cooling air volume is obviously insufficient, so that the metal of the combustor is over-heated and even burnt.
After a common SCR technology is applied, ammonia escape and increased sulfur trioxide conversion caused by ammonia injection generate ammonium bisulfate deposition, blockage and corrosion in boiler exhaust smoke waste heat recycling devices such as a rotary air preheater, a low-temperature economizer and the like, so that the boiler flue resistance is increased slightly, the power consumption of an induced draft fan is increased, the induced draft fan stalls seriously and even is caused, and a unit is not stopped.
The application of the existing air classification low-nitrogen combustion technology and SCR technology leads to the common serious problems of high-temperature corrosion of a water-cooled wall and blockage of an air preheater and a low-temperature economizer of a pulverized coal boiler of a coal-fired power plant, and the operation safety of a boiler unit is seriously influenced.
Only by adopting measures to control the generation amount of the nitrogen oxides at the initial stage of pulverized coal combustion, the negative effects caused by overuse of over-burnt air and ammonia injection amount of the SCR system can be fundamentally solved.
Disclosure of Invention
The invention aims to provide a pulverized coal deep low-oxygen combustion system which can obviously inhibit the generation of initial nitric oxides during pulverized coal combustion, and aims to solve the problems of high overfire air rate, high-temperature corrosion of a water-cooled wall, high ammonia injection amount of SCR (selective catalytic reduction) and blockage of an air preheater of the conventional pulverized coal boiler of a power station.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a pulverized coal deep low-oxygen combustion system comprises a cold air pipeline, a hot air pipeline, a boiler flue gas extraction fan, a mixer and a coal mill; the inlet of the mixer comprises a first inlet, a second inlet and a third inlet;
an over-fire air nozzle is arranged above the main burner of the boiler;
an inlet of a boiler flue gas extraction fan is connected with a tail flue of a boiler, and a boiler main burner is arranged on a hearth of the boiler; the middle lower part of the main burner of the boiler is provided with a nozzle of a pulverized coal burner, and the top of the main burner of the boiler is provided with a nozzle of secondary air; the secondary air nozzle and the over-fire air nozzle are connected with a first inlet of the mixer through a hot air pipeline, an outlet of a boiler flue gas extraction fan is connected with a second inlet of the mixer, a cold air pipeline is connected with a third inlet of the mixer, an outlet of the mixer is connected with an inlet of a coal mill, and an outlet of the coal mill is connected with a nozzle of a pulverized coal burner.
The invention is further improved in that the boiler is a corner tangential firing boiler or a wall type opposed firing boiler.
The invention is further improved in that the main burner of the boiler is a direct-flow burner or a cyclone burner.
The invention is further improved in that the outlet of the boiler flue gas extraction fan is connected with the second inlet of the mixer through a boiler flue gas pipeline.
The invention is further improved in that a boiler flue gas regulating valve is arranged on the boiler flue gas pipeline.
The invention is further improved in that the hot air pipeline is provided with a hot air regulating valve.
The invention is further improved in that the cold air pipeline is provided with a cold air regulating valve.
The invention is further improved in that a mixed medium regulating valve, a mixed medium pressure measuring device, a mixed medium temperature measuring device and a mixed medium oxygen measuring device are arranged on the outlet pipeline of the mixer.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by arranging the boiler flue gas extraction fan, the cold air pipeline and the hot air pipeline, the boiler flue gas is extracted, is dried with a mixed medium of hot air and cold air, carries coal dust and directly enters the coal dust burner, so that deep low-oxygen and low-nitrogen combustion of the coal dust is realized, and initial nitrogen oxide control is realized at the source, so that the secondary air rate can be improved at the later stage, and the over-fire air rate is reduced, thereby greatly relieving the reducing atmosphere of the main combustion area of the hearth and the wall surface of the water wall of the over-fire air area, and further obviously reducing the high-temperature corrosion risk of the water wall; meanwhile, after the emission of the initial nitrogen oxides is effectively controlled, the ammonia injection amount of the SCR system can be greatly reduced, the using amount of liquid ammonia or urea is saved, the risk of ammonia bisulfate deposition and blockage of an air preheater caused by ammonia escape can be reduced, and the explosion-proof problem of a powder preparation system can be solved.
Furthermore, on the basis of the original powder making system of the pulverized coal boiler, the invention only needs to increase a flue gas extraction flue, a corresponding air damper, a boiler flue gas extraction fan and the like to reduce the oxygen concentration of primary air powder, and the system is simple and easy to implement.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
the reference numbers in the figure are 1-hot air pipeline, 2-hot air regulating valve, 3-cold air pipeline, 4-cold air regulating valve, 5-boiler flue gas extraction fan, 6-boiler flue gas pipeline, 7-boiler flue gas regulating valve, 8-mixer, 9-mixed medium regulating valve, 10-mixed medium pressure measuring device, 11-mixed medium temperature measuring device, 12-mixed medium oxygen amount measuring device, 13-coal grinding machine, 14-boiler main burner, 15-pulverized coal burner nozzle, 16-secondary air nozzle and 17-overfire air nozzle.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a pulverized coal deep low-oxygen combustion system comprises a hot air pipeline 1, a hot air regulating valve 2, a cold air pipeline 3, a cold air regulating valve 4, a boiler flue gas extraction fan 5, a boiler flue gas pipeline 6, a boiler flue gas regulating valve 7, a mixer 8, a mixed medium regulating valve 9, a mixed medium pressure measuring device 10, a mixed medium temperature measuring device 11, a mixed medium oxygen amount measuring device 12, a coal mill 13, a boiler main burner 14, a pulverized coal burner nozzle 15, a secondary air nozzle 16 and an over-fire air nozzle 17.
Wherein, an over-fire air nozzle 17 is arranged above the main boiler burner 14.
An inlet of the boiler flue gas extraction fan 5 is connected with a tail flue (such as a turning smoke chamber, an outlet of an economizer, an inlet or an outlet of an air preheater and the like, which are specifically determined by a pulverizing system) of a boiler, the boiler is a four-corner tangential firing boiler, boiler main burners 14 are arranged at four corners of a hearth, and the boiler main burners 14 are direct-current burners. The invention is illustrated with four corner arrangements of a direct flow burner.
The middle lower part of the main boiler burner 14 is provided with a pulverized coal burner nozzle 15, and the top part is provided with a secondary air nozzle 16.
The inlets of the mixer 8 comprise a first inlet, a second inlet and a third inlet; the secondary air nozzle 16 and the over-fire air nozzle 17 are connected with a first inlet of the mixer 8 through the hot air pipeline 1, an outlet of the boiler flue gas extraction fan 5 is connected with a second inlet of the mixer 8 through the boiler flue gas pipeline 6, and the flue gas extraction position can be selected at a proper position behind the tail flue as required. The cold air pipeline 3 is connected with a third inlet of the mixer 8, an outlet of the mixer 8 is connected with an inlet of a coal mill 13 through a pipeline, and an outlet of the coal mill 13 is connected with a nozzle 15 of a pulverized coal burner.
Wherein, a hot air regulating valve 2 is arranged on the hot air pipeline 1, a cold air regulating valve 4 is arranged on the cold air pipeline 3, and a boiler flue gas regulating valve 7 is arranged on the boiler flue gas pipeline 6.
A mixed medium regulating valve 9, a mixed medium pressure measuring device 10, a mixed medium temperature measuring device 11 and a mixed medium oxygen amount measuring device 12 are arranged on a pipeline between the outlet of the mixer 8 and the inlet of the coal mill 13.
The invention is suitable for pulverized coal boilers adopting various combustion modes such as a direct-current combustor or a cyclone combustor.
The invention adopts boiler flue gas, hot air and cold air as coal powder drying and carrying media to form primary air-powder mixture to enter the coal powder burner, thereby realizing deep low-oxygen and low-nitrogen combustion of the coal powder, reducing the air rate of separated over-fire air or canceling far-release over-fire air so as to eliminate or weaken the influence of the over-fire air.
The primary air powder formed by the boiler flue gas, the hot air and the cold air and the dry coal powder can flexibly adjust the proportion according to the ignition and combustion characteristics of the coal powder and control the lower oxygen content of the primary air powder. Compared with the existing common pulverized coal boiler combustion system and air classification low-nitrogen combustion technology, the boiler flue gas is doped to greatly reduce the oxygen content of primary air powder, so that the true anoxic combustion is realized at the initial stage of pulverized coal combustion, the ignition stability of pulverized coal is ensured, the generation of nitrogen oxides at the initial stage of combustion is effectively inhibited, and the low-oxygen and low-nitrogen combustion is realized from the source; because the wind rate of the far-away over-fire air is cancelled or greatly reduced, the pulverized coal combustion products are mainly in oxidizing atmosphere in the whole area of the combustor. The explosion-proof problem of powder process system still can be alleviated simultaneously to the reduction of wind powder oxygen content.
The oxygen content of the primary air powder can be adjusted by adjusting the flow rate of the mixed boiler flue gas to be 10-18% through the hot air adjusting valve 2, the cold air adjusting valve 4 and the boiler flue gas adjusting valve 7.
The deep low-oxygen combustion system for pulverized coal can obviously reduce the primary air rate and the far-type over-fire air rate, improve the secondary air rate, reduce the flame temperature, and achieve the purposes of simultaneously controlling nitrogen oxides and relieving high-temperature corrosion of a water wall.
The working principle of the invention is as follows:
the boiler flue gas is mixed into the primary air to reduce the oxygen content of the primary air, so that the deep low-oxygen combustion of the pulverized coal is realized, and the aim of controlling the concentration of the initial nitric oxide during the pulverized coal combustion is fulfilled. The smoke is extracted from the proper position of the boiler tail flue, and mixed with the existing hot air and cold air to enter a powder making system, and dry coal powder is carried to be sent into a boiler main burner as primary air, so that a deep low-oxygen medium is formed in the boiler main burner. The generation of nitrogen oxides in the combustion of pulverized coal is mainly related to temperature, nitrogen concentration and oxygen concentration. Due to the lower oxygen content and nitrogen concentration in the primary air and the flue gas doping, the flame temperature can be obviously reduced, so that the generation of nitrogen oxides can be obviously inhibited in the initial ignition and combustion stages of the pulverized coal, and the control of the nitrogen oxides is realized from the source. The post combustion can properly improve the secondary air rate and reduce the over-fire air rate, thereby greatly relieving the reducing atmosphere of the main combustion area of the hearth and the over-fire air area, and obviously reducing the risk of high-temperature corrosion of the water-cooled wall.
Claims (8)
1. A coal powder deep low-oxygen combustion system is characterized by comprising a cold air pipeline (3), a hot air pipeline (1), a boiler flue gas extraction fan (5), a mixer (8) and a coal mill (13); the inlet of the mixer (8) comprises a first inlet, a second inlet and a third inlet;
an over-fire air nozzle (17) is arranged above the main boiler burner (14);
an inlet of a boiler flue gas extraction fan (5) is connected with a tail flue of the boiler, and a boiler main burner (14) is arranged on a hearth of the boiler; a pulverized coal burner nozzle (15) is arranged at the middle lower part of the main boiler burner (14), and a secondary air nozzle (16) is arranged at the top part of the main boiler burner; the secondary air nozzle (16) and the over-fire air nozzle (17) are connected with a first inlet of the mixer (8) through a hot air pipeline (1), an outlet of a boiler flue gas extraction fan (5) is connected with a second inlet of the mixer (8), a cold air pipeline (3) is connected with a third inlet of the mixer (8), an outlet of the mixer (8) is connected with an inlet of a coal pulverizer (13), and an outlet of the coal pulverizer (13) is connected with a nozzle (15) of a pulverized coal burner.
2. The deep low-oxygen pulverized coal combustion system as claimed in claim 1, wherein the boiler is a corner tangential firing boiler or a wall opposed firing boiler.
3. The pulverized coal deep low-oxygen combustion system according to claim 1, characterized in that the main boiler burner (14) is a straight-flow burner or a cyclone burner.
4. The deep low-oxygen pulverized coal combustion system as claimed in claim 1, wherein the outlet of the boiler flue gas extraction fan (5) is connected with the second inlet of the mixer (8) through the boiler flue gas pipeline (6).
5. The pulverized coal deep low-oxygen combustion system according to claim 4, characterized in that a boiler flue gas adjusting valve (7) is arranged on the boiler flue gas duct (6).
6. The pulverized coal deep low-oxygen combustion system according to claim 1, characterized in that a hot air regulating valve (2) is arranged on the hot air pipeline (1).
7. The pulverized coal deep low-oxygen combustion system according to claim 1, characterized in that a cold air adjusting valve (4) is arranged on the cold air pipeline (3).
8. The pulverized coal deep low-oxygen combustion system according to claim 1, characterized in that a mixed medium regulating valve (9), a mixed medium pressure measuring device (10), a mixed medium temperature measuring device (11) and a mixed medium oxygen amount measuring device (12) are arranged on the outlet pipeline of the mixer (8).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210416109.8A CN114777114A (en) | 2022-04-20 | 2022-04-20 | Deep low-oxygen combustion system for pulverized coal |
| PCT/CN2022/132032 WO2023202053A1 (en) | 2022-04-20 | 2022-11-15 | Pulverized coal deep low-oxygen combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210416109.8A CN114777114A (en) | 2022-04-20 | 2022-04-20 | Deep low-oxygen combustion system for pulverized coal |
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| CN114777114A true CN114777114A (en) | 2022-07-22 |
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| CN202210416109.8A Pending CN114777114A (en) | 2022-04-20 | 2022-04-20 | Deep low-oxygen combustion system for pulverized coal |
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| CN (1) | CN114777114A (en) |
| WO (1) | WO2023202053A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202053A1 (en) * | 2022-04-20 | 2023-10-26 | 西安热工研究院有限公司 | Pulverized coal deep low-oxygen combustion system |
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| CN110822412A (en) * | 2019-11-11 | 2020-02-21 | 新疆大学 | Low NO of pi-shaped boiler under low loadXModerate temperature flue gas recirculation system and method |
| CN113503562A (en) * | 2021-04-29 | 2021-10-15 | 西安热工研究院有限公司 | Combustion and powder-making system of fan coal mill |
| CN114777114A (en) * | 2022-04-20 | 2022-07-22 | 西安热工研究院有限公司 | Deep low-oxygen combustion system for pulverized coal |
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2022
- 2022-04-20 CN CN202210416109.8A patent/CN114777114A/en active Pending
- 2022-11-15 WO PCT/CN2022/132032 patent/WO2023202053A1/en unknown
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| US8298304B1 (en) * | 2009-02-20 | 2012-10-30 | Castle Light Corporation | Coal treatment process for a coal-fired power plant |
| WO2014008758A1 (en) * | 2012-07-10 | 2014-01-16 | 烟台龙源电力技术股份有限公司 | Pulverized coal fired boiler with wall-attachment secondary air and grid overfire air |
| CN106247368A (en) * | 2016-07-29 | 2016-12-21 | 上海交通大学 | A kind of industrial coal powder boiler flue gas recirculation low nitrogen burning method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023202053A1 (en) * | 2022-04-20 | 2023-10-26 | 西安热工研究院有限公司 | Pulverized coal deep low-oxygen combustion system |
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| WO2023202053A1 (en) | 2023-10-26 |
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