CN112050198A - Boiler system - Google Patents
Boiler system Download PDFInfo
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- CN112050198A CN112050198A CN202010836098.XA CN202010836098A CN112050198A CN 112050198 A CN112050198 A CN 112050198A CN 202010836098 A CN202010836098 A CN 202010836098A CN 112050198 A CN112050198 A CN 112050198A
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- additive
- boiler
- slagging
- burner
- secondary air
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- 239000000654 additive Substances 0.000 claims abstract description 175
- 230000000996 additive effect Effects 0.000 claims abstract description 169
- 238000010298 pulverizing process Methods 0.000 claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 239000002893 slag Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000002699 waste material Substances 0.000 description 7
- 239000000571 coke Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002023 wood Substances 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
-
- 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
- F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
-
- 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
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/50—Blending
- F23K2201/505—Blending with additives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/20—Feeding/conveying devices
- F23K2203/201—Feeding/conveying devices using pneumatic means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The application discloses boiler system belongs to coal fired boiler technical field. The boiler system includes: a boiler; the additive raw material bin is used for containing a slagging-preventing additive; the powder making system is arranged at the downstream of the additive raw material bin; the air supply device is arranged at the upstream of the pulverizing system; the combustor is arranged on a water-cooled wall of the boiler; the inlet end of the additive conveying pipe is communicated with the pulverizing system, and the outlet end of the additive conveying pipe is arranged on a water-cooled wall of the boiler; alternatively, the outlet end of the additive delivery pipe is communicated with the burner. The scheme can improve the utilization rate of the anti-slagging additive of the boiler system.
Description
Technical Field
The application belongs to the technical field of coal fired boilers, and particularly relates to a boiler system.
Background
China coal-fired power stations provide about 70% of generated energy, and about 30% of boilers of the coal-fired power stations adopt a front-back wall opposed combustion mode. At present, a large amount of easy-to-slag coal is used in a coal-fired power station boiler, water-cooled wall slagging is easy to occur when the easy-to-slag coal is used in the boiler adopting a front-back wall opposed combustion mode, and even the condition that a cold ash bucket is blocked by slag flow is generated, so that the safety and economic operation of the boiler are seriously influenced.
The addition of the anti-slagging additive into the boiler is expected to prevent the water-cooled wall from slagging. In order to achieve the anti-slagging effect, the anti-slagging additive needs to be added into the easy-slagging area in a sufficient amount. One possible simple adding mode is to add the anti-slagging additive into the coal as fired on the coal conveying belt according to 8-15% of the coal flow, then the anti-slagging additive and the coal as fired are mixed evenly in the coal grinding machine, ground into powder and finally enter the boiler furnace together. However, the anti-slagging additive in the adding mode is distributed in the whole hearth space, only a small proportion of the anti-slagging additive is positioned near the water wall to play a role in preventing slagging, and a large amount of additive in the central area of the hearth is directly wasted due to the fact that the additive is far away from the water wall. Therefore, the utilization rate of the anti-slagging additive of the boiler is low.
Disclosure of Invention
The embodiment of the application aims to provide a boiler system, which can improve the utilization rate of a slagging-preventing additive of the boiler system.
In order to solve the technical problem, the present application is implemented as follows:
a boiler system, comprising:
a boiler;
an additive raw material bin for containing a slag formation prevention additive;
a coal pulverizing system disposed downstream of the additive feed bin;
the air supply device is arranged at the upstream of the pulverizing system;
the burner is arranged on a water-cooled wall of the boiler;
the inlet end of the additive conveying pipe is communicated with the pulverizing system,
wherein the outlet end of the additive conveying pipe is arranged on the water-cooled wall of the boiler; or the outlet end of the additive delivery pipe is communicated with the combustor
In the embodiment of the application, the anti-slagging additive in the additive raw material bin is ground into powder through the independently arranged powder making system, and directly enters the boiler furnace under the action of the air supply device, and is concentrated near the water-cooled wall, or enters the burner arranged on the water-cooled wall of the boiler. Therefore, the utilization rate of the anti-slagging additive of the boiler system is higher.
Drawings
FIG. 1 is a schematic structural diagram of a burner of a boiler system according to an embodiment of the present disclosure, wherein arrow lines indicate wind directions;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic diagram of a partial structure of a boiler system according to an embodiment of the present disclosure, wherein an arrowed line indicates a flow direction of a slag-bonding preventing additive.
Description of reference numerals:
100-a boiler;
200-additive raw material bin;
300-a powder process system;
400-air supply device, 410-hot air channel, 411-hot air adjusting door, 420-cold air channel and 421-cold air adjusting door;
500-burner, 510-primary wind pipe, 511-primary wind channel, 520-secondary wind pipe, 521-outer secondary wind channel, 522-outer secondary wind swirl vane, 523-inner secondary wind channel, 524-inner secondary wind swirl vane, a-primary wind jet, b-outer secondary wind jet and c-inner secondary wind jet;
600-additive delivery pipe, 610-air volume adjusting valve;
700-dispensing system.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The boiler system provided by the embodiment of the present application is described in detail by specific embodiments and application scenarios thereof with reference to the accompanying drawings.
As shown in fig. 1 to 3, an embodiment of the present application discloses a boiler system, which includes a boiler 100, an additive raw material bin 200, a pulverizing system 300, an air supply device 400, a burner 500, and an additive delivery pipe 600.
The boiler 100 is a mechanical device that heats water into hot water or steam by using heat energy of fuel or other energy sources, and the hot water or the generated steam heated in the boiler 100 may be directly converted into heat energy, may be converted into mechanical energy by a steam power device, and may be converted into electrical energy by a generator.
The additive raw material bin 200 is used for containing a slagging-off preventing additive, the additive raw material bin 200 is arranged in a production workshop of the power station boiler 100 and is independent of coal grinding equipment, the slagging-off preventing additive can be input into the additive raw material bin 200 through a belt conveying system, and the additive raw material bin 200 can be made of steel, aluminum alloy, wood boards and other materials, and the embodiment of the application is not particularly limited to the above.
The coal pulverizing system 300 is disposed at the downstream of the additive material bin 200, that is, the coal pulverizing system 300 is adjacent to the additive material bin 200, the coal pulverizing system 300 is independent of the coal grinding equipment, after the anti-slagging additive is input into the additive material bin 200 through the belt conveying system, the anti-slagging additive stored in the additive material bin 200 can be supplied into the coal pulverizing system 300 according to the actual requirement of the boiler 100, and the operational parameters of the coal pulverizing system 300 are adjusted to make the anti-slagging additive into powder, so that the boiler 100 can use the anti-slagging additive. It should be noted that the pulverizing system 300 can be a medium-pressure pulverizing system or a direct-blowing pulverizing system, which is not particularly limited in this application. When the pulverizing system 300 is a silo-type pulverizing system, a slagging-preventing additive powder bin is further arranged at the downstream of the silo-type pulverizing system, and the slagging-preventing additive is pulverized by the silo-type pulverizing system and then stored in the slagging-preventing additive powder bin, so that the powder discharging amount of the slagging-preventing additive powder bin can be controlled, and the adding requirement of the boiler 100 on the slagging-preventing additive can be met; when the pulverizing system 300 is a direct-blowing pulverizing system, the anti-slagging additive is pulverized by the direct-blowing pulverizing system and then directly conveyed to the boiler 100, and the feeding amount of the anti-slagging additive can be controlled so as to meet the requirement of adding the anti-slagging additive to the boiler 100.
The air supply device 400 is arranged at the upstream of the coal pulverizing system 300, the air supply device 400 is adjacent to the coal pulverizing system 300, the air supply device 400 is independent of coal grinding equipment, the air supply device 400 comprises a hot air channel 410 and a cold air channel 420, and a hot air adjusting door 411 and a cold air adjusting door 421 are respectively arranged on the hot air channel 410 and the cold air channel 420 and used for controlling the temperature of the powdery anti-slagging additive pulverized by the coal pulverizing system 300. Therefore, the air supply device 400 can not only send the anti-slagging additive pulverized by the pulverizing system 300 into the boiler 100, but also control the temperature of the anti-slagging additive through the hot air damper 411 and the cold air damper 421, so as to improve the utilization rate of the anti-slagging additive and reduce waste.
The burner 500 is disposed on a water wall of the boiler 100, and the burner 500 is mainly used to deliver fuel and air into the boiler 100 to mix the fuel and the air timely and sufficiently. Secondly, the burner 500 enables the pulverized coal fed into the boiler 100 to be rapidly and stably ignited and to be rapidly and completely burned out.
The inlet end of the additive delivery pipe 600 is communicated with the pulverizing system 300, and the anti-slagging additive is pulverized by the pulverizing system 300 and then delivered into the additive delivery pipe 600 through the air supply device 400. Wherein, the outlet end of the additive delivery pipe 600 is arranged on the water wall of the boiler 100; alternatively, the outlet end of the additive delivery pipe 600 communicates with the burner 500. Specifically, when the outlet end of the additive delivery pipe 600 is arranged on the water wall of the boiler 100, the anti-slagging additive is directly sprayed into the hearth, under the condition, the radial diffusion of the anti-slagging additive jet flow is weak, the coverage range is small, the jet flow rigidity is strong, most of the anti-slagging additive still enters the center of the hearth, if the coverage effect is required to be increased, the arrangement number of the additive delivery pipe 600 (the influence of the opening of the water wall on the boiler body is great) and the dosage of the anti-slagging additive need to be increased, so that the investment is increased, the boiler system is complex, and the technical economy is weakened; if one wants to enhance the radial diffusion rate at the outlet of a single additive delivery tube 600, one still needs to increase the investment and impair the technical economy. When the outlet end of the additive delivery pipe 600 is communicated with the burner 500, the burner 500 mixes the anti-slagging additive into the fuel and the air, and the concentration of the anti-slagging additive in the area close to the water-cooled wall is several times of that in the center of the hearth, so that the anti-slagging effect can be obviously enhanced, the utilization rate of the anti-slagging additive is improved, and the use amount is reduced.
The boiler system disclosed in the embodiment of the application, in the anti-slagging additive was imported the former feed bin 200 of additive through the belt conveying system, supplied with the powder process system 300 according to boiler 100's actual demand, powder process system 300 will prevent slagging additive pulverization back through additive conveyer pipe 600, carry the water-cooling wall or the combustor 500 in the boiler 100 to reduce among the prior art a large amount of anti-slagging additives and continuously get into the violent wearing and tearing of powder process system 300 that the coal-grinding equipment caused. It should be noted that, in the operation process of the boiler 100, the area easy to be slag bonded in the boiler 100 can be determined by measuring the temperature of the furnace and/or observing the slag bonding condition in the boiler, so as to adjust the addition amount and the addition time of the additive delivery pipe 600, the blending proportion of the slag bonding prevention additive, and the like, and further increase the addition amount of the slag bonding prevention additive in the area easy to be slag bonded, so as to improve the utilization rate of the slag bonding prevention additive.
In the embodiment of the application, the anti-slagging additive in the additive raw material bin 200 is made into powder through the independently arranged powder making system 300, and enters the water-cooled wall of the boiler 100 under the action of the air supply device 400, or enters the combustor 500 arranged on the water-cooled wall of the boiler 100, after the scheme is adopted, the anti-slagging additive is more concentrated in the area close to the water-cooled wall in the boiler 100, so that the anti-slagging additive with high proportion is mixed in coal/coke particles close to the water-cooled wall, the anti-slagging effect can be obviously strengthened, meanwhile, the proportion of the anti-slagging additive in the coal/coke particles at the center of the hearth is lower, and the waste condition of the anti-slagging additive is relieved. Therefore, the utilization rate of the anti-slagging additive of the boiler system is higher, and meanwhile, the addition proportion and the pulverization particle size of the anti-slagging additive are independently and accurately controlled, so that the power generation cost of the boiler 100 can be greatly reduced, the negative pressure influence of the pulverizing system 300 is reduced, the operation reliability of the boiler 100 is improved, and the purposes of cost reduction and efficiency improvement are realized to a great extent.
In an alternative embodiment, the burner 500 includes a primary air duct 510 and a secondary air duct 520. The primary air duct 510 has a primary air passage 511, and the primary air duct 510 is used for passing the primary air jet a. The secondary air pipe 520 is sleeved outside the primary air pipe 510, the secondary air pipe 520 is provided with an outer secondary air channel 521 and an inner secondary air channel 523, and the outer secondary air channel 521, the inner secondary air channel 523 and the primary air channel 511 are all communicated with the hearth of the boiler 100. The secondary air pipe 520 is used for allowing the outer secondary air jet flow b and the inner secondary air jet flow c to pass through, and the secondary air pipe 520 is sleeved outside the primary air pipe 510, so that the outer secondary air jet flow b and the inner secondary air jet flow c wrap the primary air jet flow a, while the secondary air pipe 520 is provided with an outer secondary air channel 521 and an inner secondary air channel 523, so that the outer secondary air jet flow b wraps the inner secondary air jet flow c. Specifically, when the outlet end of the additive delivery pipe 600 is connected to the inner overfire air passage 523 or the inlet port of the overfire air duct 520, in this case, the concentration of the anti-slagging additive in the vicinity of the water wall can be increased after the burner 500 injects the anti-slagging additive in the vicinity of the water wall. However, since the inner secondary air jet c is mixed with the primary air jet a relatively early, the anti-slagging effect is much weaker than connecting the outlet end of the additive delivery tube 600 to the outer secondary air passage 521 of the burner 500, using the same amount of anti-slagging additive; or the same anti-slagging effect is achieved, the amount of the additive is significantly higher than that of the outer secondary air passage 521 connecting the outlet end of the additive delivery pipe 600 to the burner 500, which impairs technical economy. When the outlet end of the additive conveying pipe 600 extends into the outer secondary air channel 521, the anti-slagging additive is conveyed to the outer secondary air channel 521 of the burner 500 through the additive conveying pipe 600, and because the outer secondary air jet flow b and the primary air jet flow a are relatively late to be mixed, after the burner 500 sprays the anti-slagging additive to the vicinity of the water-cooled wall, the concentration of the anti-slagging additive near the water-cooled wall can be increased, so that the anti-slagging additive with a high proportion is mixed into coal/coke particles close to the water-cooled wall, the anti-slagging effect can be obviously enhanced, the proportion of the anti-slagging additive in the coal/coke particles at the center of the hearth is low, the waste is reduced, and the load of an ash conveying and deslagging system and the solid.
Further, since the secondary air pipe 520 is sleeved outside the primary air pipe 510, when the outlet end of the additive delivery pipe 600 extends into the outer secondary air channel 521, the same burner 500 is communicated with at least two additive delivery pipes 600, so that the anti-slagging additive can be relatively uniformly sprayed in the circumferential direction, and the supply amount of the anti-slagging additive can be increased. The additive delivery pipes 600 communicated with the same burner 500 are arranged at intervals along the direction surrounding the primary air pipe 510, the outlet end of the additive delivery pipe 600 extends into the outer secondary air channel 521, the extending direction of the additive delivery pipe 600 is parallel to the extending direction of the primary air pipe 510, so that more additive delivery pipes 600 are arranged, the supply amount of the anti-slagging additive is increased, meanwhile, the anti-slagging additive can be concentrated in the area close to the inner water-cooled wall of the boiler 100 as far as possible, the proportion of the anti-slagging additive in coal/coke particles in the center of a hearth is reduced, the waste is reduced, and the utilization rate of the anti-slagging additive is further improved.
In an optional embodiment, the combustor 500 further includes an outer secondary air swirling vane 522, the outer secondary air swirling vane 522 is disposed in the outer secondary air passage 521, and the outlet end of the additive conveying pipe 600 is disposed downstream of the outer secondary air swirling vane 522, so that the erosion and abrasion of the anti-slagging additive to the outer secondary air swirling vane 522 can be avoided, and the service life of the outer secondary air swirling vane 522 can be prolonged. It is noted that the combustor 500 further includes inner overfire air swirl vanes 524, and the inner overfire air swirl vanes 524 are disposed within the inner overfire air duct 523.
Optionally, the number of the burners 500 of the boiler system disclosed in the embodiment of the present application is at least two, the boiler system further includes a distribution system 700, the distribution system 700 is disposed between the pulverizing system 300 and the burners 500, the distribution system 700 includes a main pipe and branch pipes, the main pipe is communicated with at least two branch pipes, each branch pipe is provided with an outlet, and each outlet is correspondingly connected with one of the burners 500. Specifically, each main pipeline of the distribution system 700 may be connected to a plurality of branch pipelines, each branch pipeline is connected to the burner 500 through the additive delivery pipe 600, and the distribution system 700 may distribute the anti-slagging additive to different burners 500 according to different working conditions of the boiler 100, so that the anti-slagging additive is added to the outer secondary air channel 521 of each burner 500 in different proportions, and the higher the load of the boiler 100 is, the higher the proportion of the anti-slagging additive is, and conversely, the lower the load of the boiler 100 is, the smaller the proportion of the anti-slagging additive is accordingly. The distribution system 700 adjusts the amount of the anti-slagging additive according to the load of the boiler 100, not only effectively reducing the anti-slagging situation in the boiler 100, but also improving the utilization rate of the anti-slagging additive.
In a further embodiment, an air volume adjusting valve 610 is disposed on the additive delivery pipe 600 connected to each burner 500. The air volume adjusting valve 610 is mainly used for adjusting the air volume entering the burner 500, because the outlet end of the additive delivery pipe 600 extends into the outer secondary air channel 521 of the burner 500, when the air volume is small, less anti-slagging additive is correspondingly required to be mixed with the outer secondary air jet flow b, if the amount of the anti-slagging additive is too large, the burner 500 is injected into the boiler 100, which may cause the waste of the anti-slagging additive; on the contrary, when the air volume is large, more anti-slagging additives are required to be mixed with the outer secondary air jet flow b correspondingly, and if the amount of the anti-slagging additives is too small, the anti-slagging effect of the anti-slagging additives possibly sprayed into the boiler 100 by the burner 500 is not obvious. Therefore, the air quantity entering the combustor 500 is adjusted through the air quantity adjusting valve 610, so that the anti-slagging additive is timely and quantitatively sprayed into the hearth according to the working condition of the boiler 100, and the waste of the anti-slagging additive is reduced as much as possible under the condition of ensuring the anti-slagging effect of the anti-slagging additive.
In an optional embodiment, the addition amount of the anti-slagging additive can be adjusted according to the load condition of the boiler 100, and under the condition that the boiler 100 is in a high-load (85-100% rated evaporation) working condition, the total addition amount of the anti-slagging additive is 2-8% of the total coal fed into the boiler; under the condition that the boiler 100 is in a low-load (20-50% of rated evaporation capacity) working condition, the total addition amount of the anti-slagging additive is 0-5% of the total coal fed into the boiler, so that the use amount of the anti-slagging additive is reduced, and waste is reduced.
Alternatively, Na may be adjusted in the ash content of the anti-slagging additive during operation of the boiler 1002O and K2The sum of the mass contents of O is less than 4.5 percent, and Fe2O3、CaO、MgO、Na2O and K2Sum of mass of O and SiO2、Al2O3And TiO2The ratio of the mass sum of the components is 0.10-0.55, so that the anti-slagging efficiency of the anti-slagging additive is ensured, and the utilization rate of the anti-slagging additive is improved.
Alternatively, during the operation of the boiler 100, the contact area between the anti-slagging additive and the pulverized coal may be increased by controlling the average particle size of the anti-slagging additive to be less than 50 μm, so as to improve the utilization rate of the anti-slagging additive, and at the same time, the anti-slagging additive with a smaller particle size may prevent the additive delivery pipe 600 from being clogged or the burner 500 from being damaged.
Further, in an alternative embodiment, the average particle size of the anti-slagging additive is controlled to be smaller than 30 μm, so that the average particle size of the anti-slagging additive is minimized, the surface area of the anti-slagging additive is increased, the utilization rate of the anti-slagging additive is increased, and the abrasion of the anti-slagging additive to the conveying pipe 600 and the burner 500 is minimized.
It should be noted that, in order to ensure the purpose of reducing the cost and increasing the efficiency of the boiler system to the maximum extent, the utilization rate of the anti-slagging additive can be improved by adjusting at least one of the modes of the addition amount of the anti-slagging additive, the blending proportion of ash components of the anti-slagging additive, the particle size and the like, so that the use amount of the anti-slagging additive is greatly reduced, the power generation cost of the boiler 100 is reduced, and the operational reliability of the boiler 100 is improved.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A boiler system, comprising:
a boiler (100);
an additive raw material bin (200), the additive raw material bin (200) being for containing a slag-deposit-preventing additive;
a mill system (300), the mill system (300) being disposed downstream of the additive feed bin (200);
the air supply device (400), the air supply device (400) is arranged at the upstream of the pulverizing system (300);
a burner (500), said burner (500) being disposed on a waterwall of said boiler (100);
an additive conveying pipe (600), wherein the inlet end of the additive conveying pipe (600) is communicated with the pulverizing system (300),
wherein the outlet end of the additive delivery pipe (600) is arranged on the water wall of the boiler (100); alternatively, the outlet end of the additive delivery pipe (600) is communicated with the burner (500).
2. The boiler system according to claim 1, wherein the burner (500) comprises:
a primary air duct (510), the primary air duct (510) having a primary air passage (511);
the secondary air pipe (520) is sleeved outside the primary air pipe (510), the secondary air pipe (520) is provided with an outer secondary air channel (521) and an inner secondary air channel (523), and the outer secondary air channel (521), the inner secondary air channel (523) and the primary air channel (511) are communicated with a hearth of the boiler (100);
the outlet end of the additive conveying pipe (600) extends into the outer secondary air channel (521).
3. The boiler system according to claim 2, wherein the same burner (500) is in communication with at least two additive delivery pipes (600), and the additive delivery pipes (600) in communication with the same burner (500) are spaced apart in a direction around the primary air duct (510), the additive delivery pipes (600) extending in a direction parallel to the extension direction of the primary air duct (510).
4. The boiler system according to claim 2, wherein the burner (500) further comprises:
an outer secondary air swirl vane (522), the outer secondary air swirl vane (522) disposed within the outer secondary air channel (521);
the outlet end of the additive delivery tube (600) is disposed downstream of the outer secondary air swirl vanes (522).
5. The boiler system according to claim 1, further comprising a distribution system (700), wherein the distribution system (700) is disposed between the pulverizing system (300) and the burners (500), the distribution system (700) comprises a main pipe and branch pipes, the main pipe is communicated with at least two branch pipes, each main pipe is provided with an outlet, and each outlet is correspondingly connected with one burner (500).
6. The boiler system according to claim 5, wherein an air volume adjusting valve (610) is provided on the additive delivery pipe (600) connected to each burner (500).
7. The boiler system according to claim 1, wherein the total addition amount of the anti-slagging additive is 2-8% of the total amount of the coal charged into the boiler when the boiler (100) is in a high-load condition, and 0-5% of the total amount of the coal charged into the boiler when the boiler (100) is in a low-load condition.
8. The boiler system according to claim 1, wherein the ash component of the anti-slagging additive is Na2O and K2The sum of the mass contents of O is less than 4.5 percent, and Fe2O3、CaO、MgO、Na2O and K2Sum of mass of O and SiO2、Al2O3And TiO2The ratio of the mass sums of (A) to (B) is 0.10-0.55.
9. The boiler system according to claim 1, wherein the anti-slagging additive has a powder average particle size of less than 50 μm.
10. The boiler system according to claim 9, wherein the anti-slagging additive has a powder average particle size of less than 30 μm.
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| CN202010836098.XA CN112050198A (en) | 2020-08-19 | 2020-08-19 | Boiler system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010836098.XA CN112050198A (en) | 2020-08-19 | 2020-08-19 | Boiler system |
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| CN112050198A true CN112050198A (en) | 2020-12-08 |
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| CN202010836098.XA Pending CN112050198A (en) | 2020-08-19 | 2020-08-19 | Boiler system |
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| CN113405089A (en) * | 2021-07-22 | 2021-09-17 | 西安热工研究院有限公司 | Primary air powder nozzle with additive nozzle for pulverized coal fired boiler |
| CN115076704A (en) * | 2022-06-20 | 2022-09-20 | 西安热工研究院有限公司 | Coal-fired boiler |
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Application publication date: 20201208 |