CN114289161A - System for be used for preparing CFB power plant desulfurization limestone flour - Google Patents
System for be used for preparing CFB power plant desulfurization limestone flour Download PDFInfo
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- CN114289161A CN114289161A CN202111657154.4A CN202111657154A CN114289161A CN 114289161 A CN114289161 A CN 114289161A CN 202111657154 A CN202111657154 A CN 202111657154A CN 114289161 A CN114289161 A CN 114289161A
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- 235000019738 Limestone Nutrition 0.000 title claims abstract description 56
- 239000006028 limestone Substances 0.000 title claims abstract description 56
- 238000006477 desulfuration reaction Methods 0.000 title claims description 19
- 230000023556 desulfurization Effects 0.000 title claims description 19
- 235000013312 flour Nutrition 0.000 title claims description 18
- 239000000843 powder Substances 0.000 claims abstract description 150
- 238000000227 grinding Methods 0.000 claims abstract description 60
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 230000003068 static effect Effects 0.000 claims description 29
- 239000000428 dust Substances 0.000 claims description 27
- 230000009471 action Effects 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 12
- 238000011068 loading method Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Combined Means For Separation Of Solids (AREA)
Abstract
The invention relates to a system for preparing desulfurized limestone powder for a CFB power plant, which relates to the technical field of limestone grinding, and sequentially comprises S1 and feeding materials; s2, grinding the raw material; s3, conveying finished products; s4, grading the finished product; s5, adjusting the fineness of the finished product; and S6, storing and discharging. The invention has the effects of simplifying the preparation process and effectively controlling the limestone particle size classification.
Description
Technical Field
The invention relates to the field of limestone grinding, in particular to a system for preparing desulfurized limestone powder of a CFB power plant.
Background
At present, two main desulfurization methods adopting limestone as a desulfurizing agent are provided, one is dry desulfurization in a circulating fluidized bed furnace and uses 0-1.5mm coarse powder, the other is a wet flue gas desulfurization process outside the furnace and uses 250-mesh or 325-mesh fine powder, and the two desulfurization processes have strict index requirements on the fineness of the limestone powder.
At present, for coarse powder used by a desulfurization system of a power plant, the preparation process mainly comprises hammer crushing, three separation powder separators, impact crushing (sand making machine), three separation powder separators, a column mill, a waterfall flow powder separator and the like; for fine powder used in a desulfurization system, the fine powder is generally used in a vertical mill system, a traditional Raymond mill system, a ball mill +0-Sepa powder concentrator and other equipment. In order to meet the technical requirements of power plants on limestone powder for desulfurization, different production processes are generally adopted for coarse powder and fine powder, and the processes adopted are at least three-step methods (grinding, primary powder separation and secondary powder separation). For example, the application of the limestone powder preparation system for desulfurization (publication number CN206746767U) is a three-step preparation process, a column mill, a first-stage coarse powder concentrator and a second-stage fine powder concentrator are adopted, the process is complicated, and the proportion and the particle size distribution of the final coarse powder and the final fine powder cannot be adjusted on line.
Disclosure of Invention
In order to simplify the process of preparing limestone powder, the invention provides a system for preparing desulfurized limestone powder of a CFB power plant.
The invention provides a system for preparing desulfurized limestone powder for a CFB power plant, which adopts the following technical scheme:
a system for preparing desulfurized limestone powder for CFB power plants sequentially comprises S1 and a feed; s6, storing and discharging;
s3, conveying finished products; s4, grading the finished product; the S2 raw material grinding comprises S2-1 raw material grinding and powder selection;
s2-1, raw material powder and powder selection; an European-edition grinding system is adopted to comprise an European-edition grinding machine and a cyclone collector, wherein the European-edition grinding machine is integrated with grinding equipment, a grinder of the European-edition grinding machine grinds raw materials and then screens unqualified raw materials through a built-in powder selecting device, qualified coarse powder enters the cyclone collector, and a wind power pipeline of the cyclone collector is communicated with a wind power pipeline of the European-edition grinding machine to form closed circulation;
s3, conveying finished products; the cyclone collector adopts double-channel conveying during discharging, and the conveying machinery adopts a scraper conveyor or an air conveying chute;
s4, grading the finished product; and the discharge of the cyclone collector is conveyed to a dynamic and static combined type powder concentrator, the dynamic and static combined type powder concentrator screens finished products into two groups, the particle size of one group of finished products is within the range of 0-1.5mm, and the particle size of the other group of finished products is 250 meshes or 325 meshes.
Preferably, the method also comprises S5, and the fineness of the finished product is adjusted; the high-efficient cyclone collector export is installed the three-way valve, and three-way valve door below sets up two semi-manufactured goods limestone flour (0-1.5mm) conveying equipment and forms the binary channels and carries, and one of them set of conveying equipment intercommunication finished product coarse powder storehouse, one set of conveying system gets into in S4' S sound combination formula selection powder machine, and the discharge gate of sound combination formula selection powder machine sets up 3 bin outlets for middlings, farine and middle powder simultaneously, and the export of middle powder sets up the three-way valve, and this three-way valve can realize carrying to middlings or farine finished product feed bin respectively through the action switching.
On the other hand, the invention also provides an European style flour mill used in a system for preparing desulfurized limestone powder of a CFB power plant, which adopts the following scheme:
the grinding roller grading machine comprises a main machine and a grading machine, wherein the number of the grinding rollers of the main machine is 4-6; the rotating speed of the main machine is 60-100 r/min; the rotor of the classifier is a rotating cage, the diameter of the upper end of the rotor of the classifier is larger than that of the lower end of the rotor of the classifier, and the inclination angle of blades of the rotating cage is 5-25 degrees.
Preferably, the material lifting angle of the scraper knife of the main machine is 15-35 degrees.
Preferably, the air-conditioning device further comprises an air duct, wherein the air duct is communicated with the blower, and the included angle of the air duct is 15-25 degrees.
Preferably, the rotating speed of the fan is 1100r/min-1450r/min, and the running air pressure of the inner cavity of the mill is 7000Pa-9000 Pa.
On the other hand, the invention also provides a dynamic and static combined powder concentrator used in a system for preparing desulfurized limestone powder in a CFB power plant, which adopts the following scheme: the variable-frequency speed regulation device comprises static blades and a dynamic rotor, wherein the static blades are arranged around the dynamic rotor, the angle of the static blades is adjustable, the angle is 10-30 degrees, and the dynamic rotor is subjected to variable-frequency speed regulation.
In summary, the invention includes at least one of the following beneficial technical effects:
(1) the production process flow of the invention is simple, two-stage flow of the European flour mill and the dynamic-static combined type powder concentrator is adopted to produce limestone coarse powder and fine powder meeting the requirement of a desulfurization system, the process flow is shortened, and the powder preparation efficiency is obviously improved;
(2) the process system has comprehensive functions, and one set of production system can completely meet the technical requirements of the existing internal and external desulfurization modes of the CFB power plant furnace on the products of fine powder and coarse powder of the limestone desulfurizer;
(3) the grinding device adopts an European-edition flour mill, self-grinding and self-selection are carried out, the required desulfurized limestone powder particle size (0-1.5mm) can be prepared by one-time grinding, and only a dynamic and static powder concentrator is arranged at the rear end of the European-edition flour mill, so that desulfurized limestone fine powder and desulfurized limestone coarse powder are separated by the dynamic and static powder concentrator, and further, desulfurized limestone desulfurizer coarse powder and desulfurized limestone fine powder can be prepared simultaneously;
(4) by adopting the limestone desulfurization powder preparation system of the process, the proportion and the particle size distribution of the finished coarse powder and the finished fine powder can be adjusted on line, the operation convenience and the grinding efficiency of the system are greatly improved, the process flow of the system is shortened, the energy consumption of the system is greatly reduced, and the economic benefit is obvious.
Drawings
FIG. 1 is a schematic flow diagram of a system for preparing desulfurized limestone powder from a CFB power plant according to the present invention.
Fig. 2 is a schematic top and front view of the inventive cage.
FIG. 3 is a schematic view showing the operation of the rotary cage for pulverizing by sieving according to the present invention.
FIG. 4 is a schematic top view of an air duct of the European flour mill of the present invention.
FIG. 5 is the schematic view of the dynamic rotor and static blades of the combined powder concentrator of the present invention.
Description of reference numerals: 1. a feed hopper; 2. a bar valve; 3. a belt conveyor; 4. a self-discharging type iron remover; 5. a raw material hoister; 6. a pulse bag type dust collector; 7. a raw material buffer bin; 8. a metering belt feeder; 9. a self-discharging type iron remover; 10. an European plate pulverizer; 11. a cyclone collector; 12. a mill system fan; 13. a mill system pulse dust collector; 14. a three-way valve; 15. a first double-channel conveying machine; 16. a second double-channel conveying machine; 17. a bucket elevator; 18. a dynamic and static combined powder concentrator; 19. a fan of the dynamic and static combined powder concentrator; 20. a finished product fine powder conveying machine; 21. a finished coarse powder conveying machine; 22. a finished product fine powder hoister; 23. a pulse dust collector at the top of the finished product fine powder bin; 24. a finished product fine powder bin; 25. a dust remover of a fine powder loading system; 26. a finished product fine powder loading system; 27. a finished product coarse powder elevator; 28. a pulse dust collector at the top of the finished coarse powder bin; 29. a finished product coarse powder bin; 30. a coarse powder loading system dust remover; 31. finished product middlings loading system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention discloses a system for preparing desulfurized limestone powder for a CFB power plant.
Referring to fig. 1 to 5, a system for preparing desulfurized limestone powder for CFB power plants comprises, in order, S1, a feed; s3, conveying finished products; s4, grading the finished product; s5, adjusting the fineness of the finished product; and S6, storing and discharging.
S1, feeding; the feeder hopper 1 is unloaded into through forklift or supplied materials freight train to the lime stone raw materials, then open the stick valve 2 of 1 export installation of feeder hopper, the raw materials falls into the band conveyer 3 of feeder hopper 1 below, install self-discharging formula de-ironing separator 4 on this band conveyer 3, band conveyer 3 carries raw materials to 5 feed inlets of raw materials lifting machine, enter into the raw materials surge bin 7 of powder process system after promoting, this surge bin adopts closed structure and configuration dust collector, the material loading process is dust-free excessive.
The S2 raw material grinding comprises S2-1 raw material grinding and powder selection; the method comprises the following steps that limestone raw materials fall onto a metering belt feeder 8 from a gate valve at the outlet of a raw material buffer bin 7 before grinding, and then enter an European-edition grinding system after being deironized through a self-unloading deironing device 4, the European-edition grinding system comprises an European-edition grinding machine 10 and a cyclone collector 11 which are sequentially communicated, the grinding machine of the European-edition grinding machine 10 grinds the raw materials and then screens unqualified raw materials through a self-built powder selecting device, qualified coarse powder enters the cyclone collector 11, and a wind pipeline of the cyclone collector 11 is communicated with a wind pipeline of the European-edition grinding machine 10 to form closed circulation;
the European-edition flour mill 10 carries out grinding, the ground materials are separated by a powder selecting device integrated with the mill under the action of wind power, the materials sent into the powder selecting device are subjected to moving airflow with certain flow and pressure given by a fan, semi-finished limestone powder (with the granularity of 0-1.5mm) after air separation enters a cyclone collector 11 to be separated from the limestone powder, the separated limestone powder is discharged through an air-locking discharge valve at the outlet of the cyclone collector 11, and meanwhile, unqualified materials (with the granularity of more than 1.5mm) which are beaten by the mill powder selecting device fall into a grinding area of a grinding cavity again to be subjected to circular grinding again. The airflow flowing out of the cyclone collector 11 enters the fan again through the closed system connecting pipeline and then enters the grinding cavity of the grinding machine, the airflow of the whole grinding system is in closed circulation, and dust pollution caused by dust overflow when the system runs is avoided.
S3, conveying finished products; the cyclone collector 11 adopts double-channel conveying during discharging, and is divided into a first double-channel conveying machine 15 and a second double-channel conveying machine 16, and whichever conveying machine adopts a scraper conveyor or an air conveying chute; namely, a three-way valve 14 is arranged at the outlet of the cyclone collector 11, two conveying machines are arranged at the lower part of the valve, and the semi-finished limestone powder with the granularity of 0-1.5mm discharged from the cyclone collector 11 is collected by the conveying system equipment (a scraper conveyor or an air conveying chute) and then enters a bucket elevator 17.
S4, grading the finished product; the semi-finished limestone powder (0-1.5mm) enters a dynamic and static combined powder concentrator 18 through a bucket elevator 17, and two products, namely coarse powder (0-1.5mm, the average particle size of the product meets the desulfurization requirements of different boilers) meeting the desulfurization requirement in the furnace and fine powder (the particle size is 250 meshes or 325 meshes, and the sieving rate is 90%) meeting the desulfurization requirement outside the furnace are separated through the centrifugal force action of static blades and dynamic rotors in the dynamic and static combined powder concentrator 18. The cyclone collector 11 discharges materials and conveys the materials to the dynamic and static combined type powder selecting machine 18, the dynamic and static combined type powder selecting machine 18 screens finished products into two groups, the particle size of one group of finished products is within the range of 0-1.5mm, and the particle size of the other group of finished products is 250 meshes or 325 meshes.
S5, adjusting the fineness of the finished product; as mentioned above, the outlet of the cyclone collector 11 is provided with the three-way valve 14, two semi-finished limestone powder (0-1.5mm) conveying devices are arranged below the three-way valve 14 to form double-channel conveying, wherein the double-channel conveying mechanism two 16 is communicated with the finished coarse powder bin 29, and the middle part of the finished coarse powder bin 29 is sequentially conveyed to the finished coarse powder bin 29 through the finished coarse powder conveying mechanism 21 and the finished coarse powder elevator 27; the first double-channel conveying machine 15 enters a dynamic and static combined type powder selecting machine 18 of S4, a discharge port of the dynamic and static combined type powder selecting machine 18 is provided with 3 discharge ports for coarse powder, fine powder and intermediate powder, an outlet of the intermediate powder is provided with a three-way valve 14, and the three-way valve 14 can respectively discharge materials to a coarse powder or fine powder finished product conveying system through action switching, so that the particle size distribution of final coarse powder and fine powder products is changed; because the desulfurized limestone powder required by the CFB power plant has certain requirements on the particle size distribution of the limestone powder, not all limestone powder can be used for a desulfurization system as long as the limestone powder is 0-1.5mm, and the specific requirements are different according to the design of boilers of different projects, the control of the particle size distribution by the system is more beneficial to the CFB power plant desulfurization system suitable for various working conditions;
s6, storing and discharging; the coarse limestone powder and the fine limestone powder discharged from the combined powder concentrator 18 are respectively fed to corresponding finished product conveying equipment (scraper conveyor or air conveying chute), such as: the finished product fine powder conveying mechanism 20 to the finished product fine powder lifting machine 22 to the finished product fine powder bin 24, and the coarse powder is conveyed to the finished product coarse powder bin 29 through the finished product coarse powder conveying mechanism 21 and the coarse powder lifting machine to be stored for later use.
S7, controlling system dust, wherein an air duct of the cyclone collector 11 and an air duct of the European flour mill 10 in the European flour milling system are in closed circulation, the European flour milling system adopts a closed circulation system, the temperature of the circulating air flow of the system can be increased (the temperature is increased by 40-70 ℃) by heat generated in the grinding process, the temperature of the circulating air flow of the system can be increased while grinding, the drying effect can be realized, the moisture of the finished limestone powder can be effectively reduced (the moisture is reduced by 2-5%), and the adaptability of the system and the flowability of the finished flour are improved;
in addition, the raw material buffer bin 7 and the finished product bin of the system both adopt sealing structures, and are provided with dust collecting devices such as: a dust collector 30 of a coarse powder loading system, a dust collector 25 of a fine powder loading system, a pulse dust collector 28 at the top of a finished product coarse powder bin 29, a pulse dust collector 23 at the top of a finished product fine powder bin 24, a pulse bag type dust collector 6, a pulse dust collector 13 of a mill system and the like, wherein the dust collector device generally adopts the pulse bag type dust collector 6, the filtering wind speed is low (0.5-0.8m/min), and the lowest dust emission can reach 5mg/Nm3And the comprehensive dust removal efficiency is high (99.5-99.99 percent), and the national ultra-low emission requirement of dust is completely met.
The invention also discloses an European-edition flour mill 10 used in a system for preparing the desulfurized limestone powder of the CFB power plant, which comprises a main machine and a classifier, wherein the number of grinding rollers of the main machine is 4-6; the rotating speed of the main machine is 60-100 r/min;
the grinding rollers of the former grinding machine are large in number, the design of the rotating speed is high, the number of times of grinding materials in the grinding machine is large, the number of the grinding rollers is reduced according to the fineness requirement of finished limestone, the rotating speed of the grinding machine is reduced, the grinding times of the materials in the grinding machine are reduced, the coarse powder proportion can be effectively improved, and meanwhile the reduction of the number of the grinding rollers can increase the space of a grinding cavity and improve the ventilation of the grinding machine.
Referring to fig. 2 and 3, the rotor of the classifier is a rotating cage, the diameter of the upper end of the rotor of the classifier is larger than that of the lower end of the rotor of the classifier, the inclination angle of blades of the rotating cage is 5-25 degrees, and the included angle between the blades of the rotating cage and the radial diameter of the blades of the rotating cage is the inclination angle of the blades.
The material lifting angle is an included angle between a scraper knife and the horizontal plane, and the scraper knife material lifting angle of the main machine is 15-35 degrees.
Referring to fig. 4, the air duct is clamped by two adjacent arc plates in the air duct, the air duct is communicated with the blower, and an included angle between the bending angle of the air duct and the circumferential direction of the air duct is 15-25 degrees.
The rotating speed of the fan is 1100r/min-1450r/min, and the running air pressure of the inner cavity of the mill is 7000Pa-9000 Pa.
Referring to fig. 5, the invention also discloses a dynamic and static combined powder concentrator 18 used in a system for preparing desulfurized limestone powder in a CFB power plant, which comprises static blades and a dynamic rotor, wherein the static blades are arranged around the dynamic rotor, the angle between the blades of the static blades and the circumferential direction of an impeller can be adjusted within the range of 10-30 degrees, and the dynamic rotor is connected with a variable frequency speed regulation device.
Claims (8)
1. A system for preparing desulfurized limestone powder of a CFB power plant is characterized in that: comprising S1, feed;
the S2 raw material powder grinding is also included; s3, conveying finished products; s4, grading the finished product; the S2 raw material grinding comprises S2-1 raw material grinding and powder selection;
s2-1, grinding and selecting the raw materials; an European-edition grinding system is adopted to comprise an European-edition grinding machine and a cyclone collector, wherein the European-edition grinding machine is integrated with grinding equipment, a grinder of the European-edition grinding machine grinds raw materials and then screens unqualified raw materials through a built-in powder selecting device, qualified coarse powder enters the cyclone collector, and a wind power pipeline of the cyclone collector is communicated with a wind power pipeline of the European-edition grinding machine to form closed circulation;
s3, conveying finished products; the cyclone collector adopts double-channel conveying during discharging, and the conveying machinery adopts a scraper conveyor or an air conveying chute;
s4, grading the finished product; the discharge of the cyclone collector is conveyed to a dynamic and static combined type powder concentrator, the dynamic and static combined type powder concentrator screens finished products into two groups, the particle size of one group of finished products is within the range of 0-1.5mm, and the particle size of the other component is 250 meshes or 325 meshes;
and S6, storing and discharging.
2. The system for preparing desulfurized limestone powder for CFB power plants according to claim 1, wherein: s5, adjusting the fineness of the finished product; the high-efficient cyclone collector export is installed the three-way valve, and three-way valve door below sets up two semi-manufactured goods limestone flour (0-1.5mm) conveying equipment and forms the binary channels and carries, and one of them set of conveying equipment intercommunication finished product coarse powder storehouse, one set of conveying system gets into in S4' S sound combination formula selection powder machine, and the discharge gate of sound combination formula selection powder machine sets up 3 bin outlets for middlings, farine and middle powder simultaneously, and the export of middle powder sets up the three-way valve, and this three-way valve can realize carrying to middlings or farine finished product feed bin respectively through the action switching.
3. The system for preparing desulfurized limestone powder for CFB power plants according to claim 1, wherein: the system also comprises a S7 system for dust control, wherein the air ducts of the cyclone collector and the European flour mill in the European flour milling system are in closed circulation, and in addition, the pipelines and equipment in S1 feeding and S6 storage discharging of the system both adopt sealing structures and are provided with dust collecting devices, the dust collecting devices generally adopt pulse bag type dust collectors, the filtering wind speed is low (0.5-0.8m/min), and the minimum dust emission can reach 5mg/Nm3。
4. The utility model provides an European edition milling machine for preparing among system of CFB power plant's desulfurization limestone flour which characterized in that: the grinding roller grading machine comprises a main machine and a grading machine, wherein the number of the grinding rollers of the main machine is 4-6; the rotating speed of the main machine is 60-100 r/min; the rotor of the classifier is a rotating cage, the diameter of the upper end of the rotor of the classifier is larger than that of the lower end of the rotor of the classifier, the included angle between the blades of the rotating cage and the radial diameter of the blades of the rotating cage is a blade inclination angle, and the blade inclination angle of the rotating cage is 5-25 degrees.
5. The European style mill for use in a system for preparing desulfurized limestone powder for CFB power plants according to claim 3, wherein: the material lifting angle is an included angle between a scraper knife and the horizontal plane, and the scraper knife material lifting angle of the main machine is 15-35 degrees.
6. The European style mill for use in a system for preparing desulfurized limestone powder for CFB power plants according to claim 3, wherein: the air-conditioning device further comprises an air duct, the air duct is communicated with the air blower, the path of the air duct is arc-shaped when viewed from the top, and the included angle between the bending direction of the air duct and the circumferential direction of the air duct is 15-25 degrees.
7. The European style mill for use in a system for preparing desulfurized limestone powder for CFB power plants according to claim 4, wherein: the rotating speed of the blower is 1100r/min-1450r/min, and the running air pressure of the inner cavity of the mill is 7000Pa-9000 Pa.
8. A dynamic and static combined powder concentrator for preparing a system of CFB power plant desulfurized limestone powder is characterized in that: the variable-frequency speed regulation device comprises static blades and a dynamic rotor, wherein the static blades are arranged around the dynamic rotor, the angle of the static blades and the impeller of the static blades in the circumferential direction is adjustable, the adjustable angle is within the range of 10-30 degrees, and the dynamic rotor is connected with a variable-frequency speed regulation device.
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| CN202111657154.4A CN114289161B (en) | 2021-12-31 | 2021-12-31 | System for preparing CFB power plant desulfurized limestone powder |
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| CN202111657154.4A CN114289161B (en) | 2021-12-31 | 2021-12-31 | System for preparing CFB power plant desulfurized limestone powder |
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