CN112228864A - Method and boiler device capable of effectively retarding slagging of hearth and horizontal flue region of pure-fired east-east coal boiler - Google Patents
Method and boiler device capable of effectively retarding slagging of hearth and horizontal flue region of pure-fired east-east coal boiler Download PDFInfo
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- CN112228864A CN112228864A CN202011155976.8A CN202011155976A CN112228864A CN 112228864 A CN112228864 A CN 112228864A CN 202011155976 A CN202011155976 A CN 202011155976A CN 112228864 A CN112228864 A CN 112228864A
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- 239000003245 coal Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000979 retarding effect Effects 0.000 title claims abstract description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 239000000779 smoke Substances 0.000 claims description 25
- 238000002485 combustion reaction Methods 0.000 claims description 24
- 239000002893 slag Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 230000001680 brushing effect Effects 0.000 abstract description 3
- 239000002817 coal dust Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000011109 contamination Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000003513 alkali Substances 0.000 description 5
- 239000002956 ash Substances 0.000 description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 4
- 239000005995 Aluminium silicate Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 235000012211 aluminium silicate Nutrition 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- 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
- F23C5/24—Disposition of burners to obtain a loop flame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
Abstract
The invention belongs to the technical field of boilers, in particular to a method and a boiler device capable of effectively retarding slagging in a hearth and a horizontal flue region of a pure eastern Junggar coal-fired boiler, which are provided aiming at the defect that slagging is easy to occur when eastern Junggar coal is used. The boiler device is sequentially provided with main burners, over-fire air burners, separating screen superheaters, final superheaters and final reheaters according to the flow direction of flue gas, wherein the main burners are arranged at four corners of a hearth and form included angles with a water-cooled wall of the hearth, so that air flow ejected by the main burners which are arranged oppositely forms an imaginary tangent circle, and the main burners are distributed in groups and at intervals. The invention can effectively avoid the occurrence of the phenomena of coal dust wall brushing, hearth water-cooled wall and horizontal flue area slagging.
Description
The technical field is as follows:
the invention belongs to the technical field of boilers, and particularly relates to a method for effectively retarding slagging in a hearth and a horizontal flue region of a pure-burning eastern Junggar coal boiler.
Background art:
the content of alkali metal in the east China coal is obviously higherIn ash, Na2O and K2The total content of O is more than 6 percent, the high-alkali coal-fired quasi-east boiler has the characteristics of strong slagging and strong contamination, and the operation of the boiler burning the high-alkali coal faces the risks of large-area slagging and contamination of a heating surface, over-temperature of a heating surface pipe and even pipe explosion, thereby causing great influence on the safe and stable operation of the boiler.
The existing power station boilers all use the Dong coal in a mixed combustion mode, the existing mixed combustion mode is mainly divided into two modes, one mode is to mix high-ash low-alkali coal, when the combustion proportion of the Dong coal in the mixed combustion mode is not higher than 80%, only slight slagging and contamination exist on the heating surface of the boiler, and the safe and stable operation of a unit can be ensured; another way is to admix kaolin. At present, the standard eastern coal-fired machine group for combustion mostly adopts a mode of full-load blending combustion of kaolin more than 6% to slow down the slagging and contamination level of all levels of heating surfaces of a boiler.
The mode of blending and burning the high-ash low-alkali coal is limited by the contamination and slagging of each stage of heating surface of the boiler, the burning proportion of the east Junggar coal in the blending and burning mode is maintained at about 80 percent, and meanwhile, because the burning cost of the high-ash low-alkali coal is higher, the competitiveness of the blending and burning mode is greatly reduced when the burning proportion of the east Junggar coal cannot be improved; the mode of mixing and burning the kaolin can dilute alkali metal steam generated in the burning process of the eastern Junggar coal, and further slow down slagging and contamination of a heating surface of a boiler, but the mixing and burning kaolin unit has potential safety hazards of high running coal amount, large unit power generation coal consumption, serious heating surface abrasion, serious coal mill abrasion and the like, so that the competitiveness of the mixing and burning mode is gradually reduced. When the temperature of smoke flowing through the separating screen superheater and the horizontal flue is higher than the deformation softening temperature of coal ash, a large amount of slag bonding phenomena are easily generated at the separating screen and the horizontal flue, and when the slag bonding is serious, the whole horizontal flue is probably completely blocked by sediments, so that the unit is stopped due to the stalling of the fan.
The invention content is as follows:
the invention provides a method and a boiler device for effectively slowing down the slagging of a hearth and a horizontal flue region of a pure eastern Junggar coal-fired boiler, aiming at overcoming the defect that the hearth and the horizontal flue are easy to slag when the existing boiler uses the eastern Junggar coal.
The technical scheme adopted by the invention is as follows: the method for effectively retarding the slagging of the hearth and the horizontal flue region of the pure-fired east Junggar coal boiler comprises the following steps:
step 1, sequentially arranging a main burner, an over-fire air burner, a separating screen superheater, a final superheater and a final reheater in a slagging-prone area in a hearth of a boiler along the flow direction of flue gas, and selecting the highest value of a design reference value of the volume heat load of the hearth, a design reference value of the section heat load of the hearth, a design reference value of the bottom smoke temperature of the separating screen and a design reference value of the outlet smoke temperature of the final superheater, which are all lower than an industrial standard;
and 3, each main burner comprises a plurality of secondary air nozzles and primary air nozzles which are arranged at intervals, each main burner is averagely divided into an upper group, a middle group and a lower group, the distance between every two adjacent groups is x, and the value of x is determined by the properties of the fire coal.
Preferably, in the step 1, the design reference value of the heat load of the furnace volume is less than 60kW/m3The design reference value of the heat load of the furnace section is less than 3.9MW/m2The design reference value of the screen bottom smoke temperature of the separating screen superheater is not more than 1200 ℃, and the design reference value of the outlet smoke temperature of the final superheater is not more than 950 ℃.
Preferably, in step 3, the offset injection of the primary air pulverized coal airflow ejected by the upper group and the middle group can inject most of the pulverized coal in the primary pulverized coal airflow to the central region of the hearth, so that the primary air pulverized coal airflow is prevented from deflecting and adhering to the wall, the radius of the combustion flame in the region is reduced, the flue gas temperature in the region near the water-cooled wall is reduced, and an oxidizing atmosphere is formed.
Preferably, the primary air nozzle is a horizontal dense-thin coal concentrator, the horizontal dense-thin coal concentrator divides primary air coal powder airflow into two coal powder airflows with different concentrations in the horizontal direction, the dense-phase coal powder airflow is emitted to the fire side of the hearth, the light-phase coal powder airflow is emitted to the back fire side of the hearth, classification of primary air in the horizontal direction is achieved, secondary air is formed to wrap the light primary air, the light primary air is formed to wrap the thick primary air, and an oxidizing atmosphere is formed near the water-cooled wall of the hearth.
A boiler device applying the method is sequentially provided with a main burner, an over-fire air burner, a separating screen superheater, a final superheater and a final reheater along the flow direction of flue gas in a boiler, wherein the main burners are arranged on four corners of a hearth and are arranged in an angle type tangential circle combustion mode, the central axis of the main burner at each corner forms an included angle alpha with the water-cooled wall of the hearth, so that air flow sprayed out by the main burners which are oppositely arranged forms an imaginary tangential circle, and each main burner is distributed in a grouping and interval mode.
Preferably, each main burner is divided into three groups of an upper group, a middle group and a lower group at equal intervals, and each group comprises a plurality of secondary air nozzles and primary air nozzles which are alternately arranged.
Preferably, the secondary air nozzles in each group and the primary air nozzles in the lower group are all parallel to the central axis of the main burner in the rotating direction, and the air flow ejected by the secondary air nozzles and the air flow ejected by the primary air nozzles in the lower group are all parallel to the central axis of the main burner.
Preferably, the rotating direction of the primary air nozzles in the middle group has a deflection angle beta with the central axis of the main burner, and the value of beta is 45-alpha.
Preferably, the rotary direction of the primary air nozzles in the upper group deviates from the central axis of the main burner by an angle delta, and the value of delta is more than or equal to 2 beta and less than or equal to 4 beta.
Preferably, the spacing between adjacent groups in each main burner is x, the value of x being determined by the nature of the coal being fired.
The invention has the beneficial effects that:
1. the invention selects parameters of the volume heat load of the hearth, the section heat load of the hearth, the bottom smoke temperature of the separating screen and the outlet smoke temperature of the final superheater, which are all lower than the industrial standard, and aims to adopt smaller heat load parameters, thereby not only reducing the temperature level of the hearth and reducing the possibility of slag formation in the hearth, but also improving the burn-out rate of pulverized coal and slowing down the slag formation of the separating screen superheater and the smoke corner area caused by reburning of unburned carbon in fly ash, and on the other hand, the invention ensures that the inlet smoke temperature of a horizontal flue is lower than the deformation temperature of coal ash by controlling the outlet smoke temperatures of the separating screen and the final superheater, and can thoroughly avoid slag formation and contamination in the smoke corner area.
2. The boiler is arranged in an angle type small tangential circle combustion mode, the main burner adopts a horizontal thick and thin burner, and the horizontal thick and thin coal concentrator is used for shunting to form two coal powder airflows with greatly different concentrations, so that coal powder wall brushing can be effectively avoided, and slag bonding of a water-cooled wall of a hearth can be effectively avoided.
3. The main burners in the invention are distributed in groups and at intervals, and the grouped arrangement is favorable for reducing the heat load in the combustion area of the boiler, reducing the smoke temperature level of the combustion area of the boiler and reducing the possibility of slag bonding in the combustion area.
Description of the drawings:
FIG. 1 is a schematic view of the overall structure of a boiler according to the present invention;
FIG. 2 is a schematic view of the jets of a main burner in the main combustion zone;
FIG. 3 is a schematic view of the main burner configuration;
wherein: 1 hearth, 2 main burners, 21 upper groups, 22 middle groups, 23 lower groups, 3 over-fired burners, 4 partition screen superheaters, 5 final superheaters and 6 final reheaters.
The specific implementation mode is as follows:
the invention relates to a method for effectively retarding slagging in a hearth and a horizontal flue region of a pure-burning eastern Junggar coal boiler, which specifically comprises the following steps:
step 1, as shown in fig. 1, a main burner 2, an over-fire air burner 3, a separating screen superheater 4, a final superheater 5 and a final reheater 6 are sequentially arranged in a slag-bonding area in a hearth 1 of a boiler along a flue gas flow direction, and in order to alleviate the slag-bonding phenomenon in the hearth 1 of the boiler, the separating screen superheater 4 and a horizontal flue area, a design reference value of a volume heat load of the hearth 1, a design reference value of a hearth section heat load, a design reference value of a separating screen bottom flue gas temperature and a final superheater are combinedThe maximum value of the design reference value of the outlet smoke temperature is lower than the industry standard for selection, specifically, the design reference value of the volume heat load of the hearth 1 is less than 60kW/m3The design reference value of the heat load of the section of the hearth 1 is less than 3.9MW/m2The design reference value of the screen bottom smoke temperature of the separating screen superheater 4 is not more than 1200 ℃, and the design reference value of the outlet smoke temperature of the final superheater 5 is not more than 950 ℃. By adopting smaller volume heat load parameters of the hearth 1, the temperature level of the hearth can be reduced, the possibility of slag bonding in the hearth is reduced, the coal powder burnout rate can be improved, and the slag bonding of the separating screen superheater and the smoke corner area caused by the reburning of unburned carbon of fly ash is slowed down. On the other hand, the smoke temperature at the bottom of the separating screen and the outlet of the final superheater is controlled, the smoke temperature at the inlet of the horizontal flue is lower than the deformation temperature of the coal ash, and slagging and contamination in a smoke corner area can be thoroughly avoided.
And 2, arranging the boiler in a pi-shaped mode in an angular tangential firing mode, mounting the main burners on four corners of a hearth 1 of the boiler as shown in fig. 2, wherein the central axis of each corner of the main burner forms an included angle alpha with a water-cooled wall of the hearth, wherein the alpha range is 40-43 degrees, so that air flow sprayed by the main burners 2 which are oppositely arranged forms a small imaginary tangential circle, thereby effectively avoiding coal dust wall brushing and reducing the possibility of slag bonding of the water-cooled wall of the hearth.
And 3, each main burner comprises a plurality of secondary air nozzles and primary air nozzles which are arranged at intervals, each main burner 2 is distributed in a grouping and interval manner, as shown in fig. 3, each main burner 2 is averagely divided into three groups, namely an upper group 21, a middle group 22 and a lower group 23, the distance between every two adjacent groups is x, the value of x is determined by the nature of fire coal, the grouping arrangement is favorable for reducing the heat load in a boiler combustion area, the smoke temperature level of the boiler combustion area is reduced, and the possibility of slag bonding in the combustion area is reduced.
The upper group 21 of each main burner 2 is sequentially divided into an FF layer, an F layer, an EF layer, an E layer and an EE layer from top to bottom, the middle group 22 of each main burner 2 is sequentially divided into a DD layer, a D layer, a CD layer, a C layer and a CC layer from top to bottom, and the lower group 23 of each main burner 2 is sequentially divided into a BB layer, a B layer, an AB layer, an A layer and an AA layer from top to bottom.
The secondary air nozzles are distributed on an AA layer, an AB layer, a BB layer, a CC layer, a CD layer, a DD layer, an EE layer, an EF layer and an FF layer of the main burner 2, the rotating direction of each secondary air nozzle is parallel to the central axis of the main burner 2, and the air flow sprayed out by the secondary air nozzles is parallel to the central axis of the main burner 2.
The primary air nozzles are distributed on the layer A, the layer B, the layer C, the layer D, the layer E and the layer F of the main burner 2, a horizontal dense-thin coal concentrator is selected as a nozzle, the horizontal dense-thin coal concentrator can divide primary air coal powder airflow into two coal powder airflows with greatly different concentrations in the horizontal direction, the dense-phase coal powder airflow is emitted to the fire side of the hearth 1, the light-phase coal powder airflow is emitted to the back fire side of the hearth 1, classification of primary air in the horizontal direction is achieved, an air-wrapped powder structure is formed, oxidizing atmosphere is formed near a water-cooled wall of the hearth 1, on one hand, the coal powder burnout rate is improved, on the other hand, the smoke temperature of the area near the water-cooled wall is reduced, and the purpose of effectively avoiding slag formation of the water-cooled wall in.
The primary air nozzles in the A layer and the B layer and the secondary air nozzles in the BB layer, the AB layer and the AA layer are arranged in the lower group 23 of the main burner 2, the turning directions of the primary air nozzles in the A layer and the B layer are parallel to the central axis of the main burner 2, so that the primary air pulverized coal airflow direction sprayed out from the A layer and the B layer is parallel to the central axis of the main burner 2, the secondary air airflow sprayed out from the AA layer and the AB layer assists to drag pulverized coal airflow sprayed out from the A layer and the B layer primary air nozzles, pulverized coal is prevented from falling into a bottom ash bucket, the carbon content of bottom slag is effectively reduced, meanwhile, the timely mixing of the secondary air airflow sprayed out from the AA layer and the AB layer and the primary pulverized coal airflow sprayed out from the A layer and the B layer can be ensured, and the oil-throwing-free stable combustion capability and the pulverized coal combustion efficiency of a unit in a.
The primary air nozzles positioned in the C layer and the D layer and the secondary air nozzles positioned in the DD layer, the CD layer and the CC layer are arranged in the middle group 22 of the main burner 2, the deflection angle between the rotary direction of the primary air nozzles in the C layer and the D layer and the central axis of the main burner 2 is beta, and the value of beta is 45-alpha, so that the primary air pulverized coal airflow sprayed out of the primary air nozzles in the C layer and the D layer forms opposite-flow airflow in the hearth 1 to form a phenomenon that the secondary air wraps the light primary air and the light primary air wraps the thick primary air, and the slag bonding phenomenon of the hearth water-cooled wall in the area can be effectively prevented.
The primary air nozzles in the E layer and the F layer and the secondary air nozzles in the FF layer, the EF layer and the EE layer are arranged on the upper group 21 of the main burner 2, the rotating directions of the primary air nozzles in the E layer and the F layer are deflected by an angle delta with the central axis of the main burner 2, and the value range of delta is 2 beta or more and 4 beta or less, so that pulverized coal airflow ejected from the primary air nozzles in the E layer and the F layer forms a reverse tangent circle in the hearth 1, a structure that the secondary air wraps the light primary air and the light primary air wraps the thick primary air is formed, and the possibility of slag bonding of the hearth 1 in the region can be greatly reduced.
The primary air pulverized coal airflow jetted by the upper group 21 and the middle group 22 is jetted into the central area of the hearth 1 in an offset mode, most of pulverized coal in the primary air pulverized coal airflow can be jetted into the central area of the hearth, deflection and adherence of the primary air pulverized coal airflow are prevented, the radius of combustion flame in the area is reduced, the flue gas temperature of the area near a water-cooled wall is reduced, oxidizing atmosphere is formed, and the slag bonding phenomenon of the water-cooled wall of the hearth can be effectively avoided.
The boiler device can effectively slow down slagging of a pure-burning eastern Junggar boiler furnace and a horizontal flue region, is arranged by adopting the method, and particularly comprises a main burner 2, an over-fire air burner 3, a separating screen superheater 4, a final superheater 5 and a final reheater 6 which are sequentially arranged along the flow direction of flue gas in the boiler, wherein the main burner 2 is arranged at four corners of the furnace 1 and arranged in an angular tangential combustion mode, the central axis of the main burner 2 at each corner forms an included angle alpha with the water wall of the furnace, the alpha range is 40-43 degrees, so that air flow sprayed out of the main burners 2 which are oppositely arranged forms an imaginary tangential circle, and each main burner 2 is distributed in a grouping and interval mode.
Each main burner 2 is divided into three groups of an upper group 21, a middle group 22 and a lower group 23 at an average interval, and the interval between the adjacent two groups in each main burner 2 is x, and the value of x is determined by the nature of the coal to be fired.
Every group all contains a plurality of secondary air nozzle and the wind nozzle of setting in turn, and the secondary air nozzle in every group and the wind nozzle of the wind.
The deflection angle between the rotating direction of the primary air nozzles in the middle group 22 and the central axis of the main burner 2 is beta, and the value of beta is 45-alpha; the turning direction of the primary air nozzles in the upper group 21 deviates from the central axis of the main burner 2 by an angle delta, and the value of delta is more than or equal to 2 beta and less than or equal to 4 beta.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The method for effectively retarding the slagging of the hearth and the horizontal flue region of the pure-fired east Junggar coal boiler is characterized by comprising the following steps of:
step 1, a main burner (2), an over-fire air burner (3), a separating screen superheater (4), a final superheater (5) and a final reheater (6) are sequentially arranged in a slag-bonding area in a hearth (1) of a boiler along the flow direction of flue gas, and the highest value of a design reference value of the volume heat load of the hearth, a design reference value of the section heat load of the hearth, a design reference value of the bottom smoke temperature of the separating screen and a design reference value of the outlet smoke temperature of the final reheater are all lower than an industrial standard to be selected;
step 2, arranging the boiler in a pi-shaped manner in an angular tangential circle combustion mode, mounting the main burners (2) on four corners of a boiler hearth (1), wherein the central axis of each corner of the main burner forms an included angle alpha with a water-cooled wall of the hearth, so that airflow jetted by the main burners which are oppositely arranged forms an imaginary tangential circle;
and 3, each main burner comprises a plurality of secondary air nozzles and primary air nozzles which are arranged at intervals, each main burner (2) is averagely divided into three groups, namely an upper group (21), a middle group (22) and a lower group (23), the distance between every two adjacent groups is x, and the value of x is determined by the properties of fire coal.
2. The method for effectively reducing the slag formation in the hearth and horizontal flue area of the pure-fired eastern Junggar coal boiler as claimed in claim 1, wherein: in the step 1, the design reference value of the volume heat load of the hearth (1) is less than 60kW/m3The design reference value of the thermal load of the section of the hearth (1) is less than 3.9MW/m2The design reference value of the screen bottom smoke temperature of the separating screen superheater (4) is not more than 1200 ℃, and the design reference value of the outlet smoke temperature of the final superheater (5) is not more than 950 ℃.
3. The method for effectively reducing the slag formation in the hearth and horizontal flue area of the pure-fired eastern Junggar coal boiler as claimed in claim 1, wherein: in the step 3, the primary air pulverized coal airflow jetted by the upper group (21) and the middle group (22) is injected in an offset mode, most of pulverized coal in the primary air pulverized coal airflow can be jetted to the central area of the hearth (1), the primary air pulverized coal airflow is prevented from deflecting and adhering to the wall, the radius of combustion flame in the area is reduced, the flue gas temperature of the area near the water wall is reduced, and oxidizing atmosphere is formed.
4. The method for effectively reducing the slag formation in the hearth and horizontal flue area of the pure-fired east-Junggar coal boiler as claimed in claim 3, wherein: the primary air nozzle selects a horizontal dense-thin coal concentrator as a nozzle, the horizontal dense-thin coal concentrator divides primary air coal powder airflow into two coal powder airflows with different concentrations in the horizontal direction, the dense-phase coal powder airflow is emitted to the fire side of the hearth (1), the light-phase coal powder airflow is emitted to the back fire side of the hearth (1), grading of primary air in the horizontal direction is achieved, secondary air is formed to wrap light primary air, the light primary air is wrapped by thick primary air, and oxidizing atmosphere is formed near the water-cooled wall of the hearth (1).
5. A boiler plant according to the method of any of claims 1-4, characterized in that: be equipped with main burner (2), burn out air burner (3), separate and shield over heater (4), final superheater (5) and final reheater (6) in proper order according to the flow direction along the flue gas in the boiler, main burner (2) are installed on the four corners of furnace (1), and adopt the setting of angle formula tangent circle combustion form, and the central axis of main burner (2) in every bight forms contained angle alpha with furnace's water-cooling wall, makes main burner (2) spun air current formation imagination tangent circle of relative setting, every main burner (2) adopt grouping, interval distribution.
6. The boiler arrangement according to claim 5, wherein: each main burner (2) is divided into three groups of an upper group (21), a middle group (22) and a lower group (23) at an average interval, and each group comprises a plurality of secondary air nozzles and primary air nozzles which are alternately arranged.
7. The boiler arrangement according to claim 6, wherein: the secondary air nozzle in each group and the primary air nozzle in the lower group (23) are parallel to the central axis of the main burner (2) in the rotating direction, and the airflow jetted by the secondary air nozzle and the airflow jetted by the primary air nozzle in the lower group (23) are parallel to the central axis of the main burner (2).
8. The boiler arrangement according to claim 6, wherein: the deflection angle between the rotating direction of the primary air nozzles in the middle group (22) and the central axis of the main burner (2) is beta, and the value of beta is 45-alpha.
9. The boiler arrangement according to claim 6, wherein: the rotary direction of the primary air nozzles in the upper group (21) is deviated from the central axis of the main burner (2) by an angle delta, and the value of delta is more than or equal to 2 beta and less than or equal to 4 beta.
10. The boiler arrangement according to any of claims 5-9, wherein: the spacing between two adjacent groups in each main burner (2) is x, the value of x being determined by the nature of the coal.
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| CN202011155976.8A CN112228864A (en) | 2020-10-26 | 2020-10-26 | Method and boiler device capable of effectively retarding slagging of hearth and horizontal flue region of pure-fired east-east coal boiler |
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| CN113654079A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Combustion method for effectively reducing slagging and high-temperature corrosion of boiler hearth |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207975627U (en) * | 2017-11-16 | 2018-10-16 | 东方电气集团东方锅炉股份有限公司 | It is suitable for using the 660MW grade ultra-supercritical boilers of high alkalinity coal |
| CN109028038A (en) * | 2018-07-18 | 2018-12-18 | 哈尔滨锅炉厂有限责任公司 | It can effectively reduce the combustion method of boiler furnace slagging |
| CN111594828A (en) * | 2020-04-10 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Anti-slagging method based on boiler design angle |
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2020
- 2020-10-26 CN CN202011155976.8A patent/CN112228864A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207975627U (en) * | 2017-11-16 | 2018-10-16 | 东方电气集团东方锅炉股份有限公司 | It is suitable for using the 660MW grade ultra-supercritical boilers of high alkalinity coal |
| CN109028038A (en) * | 2018-07-18 | 2018-12-18 | 哈尔滨锅炉厂有限责任公司 | It can effectively reduce the combustion method of boiler furnace slagging |
| CN111594828A (en) * | 2020-04-10 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Anti-slagging method based on boiler design angle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654079A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Combustion method for effectively reducing slagging and high-temperature corrosion of boiler hearth |
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