CN116571305B - Medium speed coal mill for low energy consumption type coal-fired boiler - Google Patents
Medium speed coal mill for low energy consumption type coal-fired boiler Download PDFInfo
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- CN116571305B CN116571305B CN202310053988.7A CN202310053988A CN116571305B CN 116571305 B CN116571305 B CN 116571305B CN 202310053988 A CN202310053988 A CN 202310053988A CN 116571305 B CN116571305 B CN 116571305B
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- 239000003245 coal Substances 0.000 title claims abstract description 234
- 238000005265 energy consumption Methods 0.000 title claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 43
- 238000000227 grinding Methods 0.000 claims description 70
- 238000001514 detection method Methods 0.000 claims description 42
- 239000002817 coal dust Substances 0.000 claims description 38
- 238000005192 partition Methods 0.000 claims description 28
- 230000000903 blocking effect Effects 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 16
- 238000009826 distribution Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 54
- 239000000843 powder Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 18
- 230000001105 regulatory effect Effects 0.000 description 17
- 238000000926 separation method Methods 0.000 description 14
- 230000009471 action Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/286—Feeding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/30—Shape or construction of rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/42—Driving mechanisms; Roller speed control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Crushing And Grinding (AREA)
Abstract
The invention discloses a medium speed coal mill for a low energy consumption type coal-fired boiler, which comprises a shell, a flow guiding device, a crushing device and a coal feeder, wherein the shell is communicated with a flow guiding device pipeline, a crushing cavity is arranged on the shell, the crushing device is arranged in the crushing cavity, a coal dropping pipe is arranged at an outlet of the coal feeder, the coal feeder is connected with the shell through the coal dropping pipe, the lower end of the coal dropping pipe is communicated with the crushing cavity pipeline, the flow guiding device is connected with the coal dropping pipe, the flow guiding device comprises an overgrinding air pipe, one end of the overgrinding air pipe, which is far away from the coal dropping pipe, is provided with an air preheater, an outlet of the air preheater is communicated with the coal dropping pipe pipeline, a bypass air pipe is further arranged at an outlet of the air preheater, the bypass air pipe is communicated with the shell pipeline, gas is heated through the air preheater, hot gas is conveyed into the coal dropping pipe through the overgrinding air pipe, external moisture of raw coal is evaporated, the bypass air pipe is conveyed to the outlet of the medium speed coal mill, secondary drying is carried out on pulverized coal, the primary air temperature entering the boiler is improved, and energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of coal mills, in particular to a medium-speed coal mill for a low-energy-consumption coal-fired boiler.
Background
With the continuous enhancement of environmental awareness of enterprises and the gradual alleviation of contradiction between power supply and demand, new power supply points are continuously put into operation, the production and development of high-energy-consumption coal-fired power generation enterprises are limited, the operation situation of the enterprises becomes very serious, and the enterprises face vigorous competition. In order to reduce the coal consumption of the coal motor group and improve the economy, the electricity utilization rate of the whole plant needs to be reduced as much as possible. The coal mill belongs to high energy consumption equipment in the whole plant equipment of the coal-fired power plant, and the economical efficiency of the whole plant can be effectively improved by reducing the power consumption of the coal mill.
The medium speed coal mill is used as important equipment in the field of pulverized coal boilers, has great influence on the combustion performance of pulverized coal, and is generally used for milling coal with low water content or steel ball milling in the process of milling coal with low water content, so that the general medium speed coal mill is difficult to be suitable for coal with high water content. At present, most medium speed coal mills are used in the process of heating and evaporating external moisture of raw coal only through primary hot air, and because the moisture contents of different coal qualities are different, fixed heating power is kept, the thermal drying quality of the raw coal cannot be ensured, the coal grinding efficiency is not only influenced, the primary air temperature at the outlet of the coal mill can be greatly influenced, and the burnout property of coal dust is reduced.
In the raw coal drying process, excessive hot air is introduced to greatly increase energy consumption, influence the economic benefit of enterprises, and the ignition and burnout performance of coal dust can be influenced by excessive primary air speed. In addition, in the process of preparing the pulverized coal, the granularity of raw coal cannot be kept consistent, and smaller pulverized coal particles cause dynamic friction lubrication between the raw coal and a grinding roller to influence the grinding quality of the raw coal.
Disclosure of Invention
The invention aims to provide a medium-speed coal mill for a low-energy-consumption coal-fired boiler and a centrifugal method, so as to solve the problems in the background art.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a medium speed coal pulverizer for low power consumption formula coal fired boiler, which comprises a housin, guiding device, breaker and feeder, casing and guiding device pipeline intercommunication, be equipped with broken chamber on the casing, breaker is arranged in broken intracavity, the feeder export is equipped with the coal drop pipe, the feeder passes through coal drop pipe and casing connection, coal drop pipe lower extreme and broken chamber pipeline intercommunication, guiding device and coal drop union coupling, guiding device includes the overgrinding tuber pipe, overgrinding tuber pipe is kept away from coal drop pipe one end and is equipped with air heater, air heater export is through overgrinding tuber pipe and coal drop pipe pipeline intercommunication, air heater export still is equipped with the bypass tuber pipe, bypass tuber pipe and casing pipeline intercommunication.
The shell is used as a main installation foundation for installing other devices, raw coal is supplied through the coal feeder, raw coal is conveyed into the crushing cavity through the coal dropping pipe, raw coal is ground through the built-in crushing device, hot air flow is conducted through the flow guiding device, gas heating is conducted through the air preheater, heated air is conducted through the bypass air pipe and the overgrinding air pipe, hot air is conveyed into the coal dropping pipe through the overgrinding air pipe, raw coal in the coal dropping pipe is heated and dried, external moisture of the raw coal is evaporated, hot air is conveyed to the outlet of the medium-speed coal mill through the bypass air pipe, ground coal dust is secondarily dried, the speed of the ground coal dust is increased, the circulation speed is increased, the separation of water vapor and the coal dust is facilitated, the primary air temperature entering the boiler is increased, the combustion in the boiler is more stable, the burnout performance of the coal dust is improved, the combustion efficiency of the boiler is ensured, and the energy consumption is reduced.
Further, the crushing device comprises two grinding rolls, the two grinding rolls are arranged in the crushing cavity, driving motors are respectively arranged at the end parts of the two grinding rolls, the two driving motors are fixedly connected with the crushing cavity, the output rotation directions of the two driving motors are opposite, a plurality of grinding convex surfaces are arranged along the circumferential direction of the grinding rolls, a plurality of grinding convex surfaces are arranged in an array manner, and the contact positions of the two grinding rolls are downwards rotated;
the flow guiding device further comprises a detection component, a detection stroke is arranged on the coal dropping pipe, a detection cavity is arranged at the upper end of the detection stroke, the detection component is arranged in the detection cavity and comprises a positive plate, a negative plate and a power supply, the positive plate and the negative plate are oppositely arranged, and the positive plate and the negative plate are respectively electrically connected with a power supply terminal.
The crushing device comprises two grinding rollers which are meshed and ground in a centering manner, each grinding roller is arranged in a crushing cavity, each grinding roller is driven by a driving motor, the two grinding rollers are rotated reversely, the adjacent ends of the two grinding rollers are grinding ends, raw coal is ground, a plurality of grinding convex surfaces which are arranged in the circumferential direction are pressed on the surface of the raw coal, the local acting force is improved, the crushing efficiency of the raw coal is improved, the crushed coal dust can fall into the lower side of the crushing cavity under the action of dead weight through the meshing position and is prevented from accumulating at the upper end of the meshing position of the two grinding rollers, dynamic friction lubrication is caused, the crushing quality is influenced, hot air is fed into the detection stroke of a coal dropping pipe through an overgrinding air pipe, raw coal in the detection stroke is subjected to primary drying, the external moisture of the raw coal is evaporated, the evaporated gas density is small, the upward diffusion is carried out, the raw coal is insulated between a positive plate and a negative plate through air, when the water vapor enters between the positive plate and the negative plate in the detection cavity, the current humidity is increased, the air is increased, the electric conductivity is increased through the power supply, the voltage is kept unchanged, the current value generated on the circuit is increased along with the increase of the electric conductivity, the fact that the water content is increased, the water content is greatly monitored, and the excess water content is prevented from being high, and the real-time consumption is greatly increased, and the quality is prevented.
Further, guiding device still includes compensation subassembly and compensation tuber pipe, is equipped with dry stroke on the coal breakage pipe, compensation tuber pipe and dry stroke pipeline intercommunication, and compensation tuber pipe is kept away from coal breakage pipe one end and air preheater outlet pipeline intercommunication, and compensation tuber pipe export is equipped with the compensation room, and compensation subassembly is arranged in the compensation room, and compensation subassembly includes baffle, electro-magnet and pretension spring, electro-magnet and compensation room fastening connection, baffle and compensation room sliding connection, baffle ladder formula setting, the baffle is magnet material, and the pretension spring is established to the outer cover of baffle, and baffle ladder face one end and compensation room butt are kept away from to the pretension spring.
The method comprises the steps of guiding partial air flow heated by an air preheater through a compensation air pipe, feeding the partial air flow into a drying stroke of a coal dropping pipe, secondarily drying raw coal after primary drying, installing a compensation assembly through a compensation chamber on the compensation air pipe, fixing an electromagnet in the compensation chamber, enabling a partition plate to be made of a magnet material, enabling opposite ends of the electromagnet and the partition plate to be different-name magnetic poles after the partition plate is electrified, applying spring force to the partition plate through a pre-tightening spring, enabling the partition plate to be located at a position far away from the electromagnet in an initial state, enabling a interception area to be the largest, enabling an overflow area to be the smallest, enabling air supply quantity per unit time of the compensation air pipe to be the smallest, controlling input current of the electromagnet according to different water contents of the detected raw coal after primary drying, and enabling magnetic field intensity of the end portion of the electromagnet to be changed, for example, when the input current is increased, magnetic pole suction between the electromagnet and the partition plate is increased, enabling the partition plate to overcome the pre-tightening spring suction force to move to one side of the electromagnet, enabling the pre-tightening spring to be further compressed, enabling the quantity of hot air flowing out of the compensation air to be increased, and improving instant drying efficiency.
Further, the positive plate, the negative plate and the power supply are connected into a control circuit, and the electromagnet is electrically connected with the control circuit;
when intercepting: the baffle moves to one side far away from the electromagnet, so that the interception area of the outlet of the compensation air pipe is increased.
The positive plate, the negative plate and the power supply are electrically connected to form a control circuit and are electrically connected with the electromagnetic iron, the water content of raw coal is detected in real time through the magnitude of the current of the control circuit, the air outlet of the compensation air pipe in the secondary drying process is regulated according to the raw coal with different water contents, and the drying effect is regulated, so that the water content of the dried raw coal is kept consistent as much as possible.
Further, the outlet at the lower end of the crushing cavity is provided with a guide channel, the guide channel is sequentially provided with a main channel and a spiral channel along the flowing direction of internal media, a bypass air pipe is communicated with the main channel, the main channel is communicated with the crushing cavity, the spiral channel is gradually arranged, the spiral channel is close to the maximum spiral channel, a drainage port is formed in the inner side of the spiral channel, the flow guiding device further comprises a flow distribution plate, the flow distribution plate is obliquely arranged, the flow distribution plate is located at the position of the drainage port, and an included angle between the flow distribution plate and the wall surface of the spiral channel faces the main channel.
The pulverized coal after crushing is guided through the guide channel, the main channel is communicated with the crushing cavity, the pulverized coal enters the main channel under the action of gravity, hot air is fed into the main channel through the bypass air pipe to heat the pulverized coal, thereby drying and evaporating moisture in the raw coal, the air supply direction of the bypass air pipe flows along the main channel towards the spiral channel, the pulverized coal is blown to move, so that the pulverized coal air flow rapidly flows along the spiral channel, the pulverized coal and the water vapor are gradually reduced along with the gradual spiral channel, the pulverized coal and the water vapor are subjected to the centrifugal force effect, compared with the pulverized coal with larger mass, the received centrifugal force is larger, when the pulverized coal is conveyed, pulverized coal particles are positioned on the outer layer of the spiral channel, the water vapor is positioned on the inner side of the spiral channel, the splitter plate is obliquely arranged, when the pulverized coal air flow approaches to the splitter plate, the water vapor on the inner layer automatically delaminates under the action of the centrifugal force flows upwards along the splitter plate, flows out from the outlet, the subsequent stroke is prevented from being influenced, and the primary air temperature is reduced.
Further, the flow guiding device further comprises a flow guiding seat, a separation cavity is arranged at the tail end of the spiral channel, the flow guiding seat is arranged in the separation cavity, parallel surfaces and flow guiding surfaces are respectively arranged at two sides of the flow guiding seat facing the wall surface of the separation cavity, the parallel surfaces are positioned at the lower side of the flow guiding seat, the flow guiding surfaces are positioned at the upper side of the flow guiding seat, vortex surfaces are arranged at the junction of the tail ends of the parallel surfaces and the flow guiding surfaces, and the vortex surfaces and the parallel surfaces are vertically arranged.
The pulverized coal airflow from which the water vapor is separated keeps a layered flowing state under the action of centrifugal force, the inner layer is fine pulverized coal, the outer layer is coarse pulverized coal, when entering the separation cavity along the spiral channel, the pulverized coal airflow is split by the guide seat, so that the coarse pulverized coal can flow along the parallel surface at the lower side of the guide seat, the fine pulverized coal flows along the guide surface at the upper end of the guide seat, the travel length of the guide surface in the same distance is greater than that of the parallel surface, the fine pulverized coal enters the rear end of the vortex surface to form downward vortex, and the coarse pulverized coal enters the rear end of the vortex surface to form upward vortex, so that a negative pressure area is formed.
Further, the guiding device further comprises a blocking block, an adjusting groove is formed in one side of the guiding channel and communicated with the separation cavity, the roughness of the wall surface of the adjusting groove gradually increases from bottom to top, the blocking block is in friction connection with the adjusting groove, the blocking block is in a wedge-shaped structure, the diameter of the adjusting groove gradually changes, and the bottom end of the adjusting groove is communicated with an outlet pipeline of the air preheater.
Through the negative pressure area under the vortex state that forms, make the vortex that the regulating tank upper end formed towards fine coal powder, under the negative pressure state, make the sprue upward overcoming self gravity and wall's frictional force, the continuous increase in the process of regulating tank width upwards extends, along with the sprue upward, the overflow area between sprue and the regulating tank increases gradually, when the pulverized coal air current that supplies between the moment is more, the pulverized coal velocity of flow through the guide surface is faster, the negative pressure grade that produces is greater, thereby the distance that makes the sprue upwards move is greater, regulating tank bottom and air heater pipeline intercommunication, make the heat that gets into fine coal powder vortex through the regulating tank increase, thereby improve primary air temperature, finally through heating fine coal powder earlier, make fine coal powder temperature be higher than coarse coal powder temperature, fine coal powder ignites earlier in the combustion process, the coarse coal powder of fine coal powder is fired again, guarantee the burn-off efficiency.
As an optimization, the detection stroke is located at the upper end of the drying stroke. In the coal falling process, raw coal is subjected to detection travel and is subjected to primary drying through an overgrinding air pipe, the detected water content of the raw coal is represented by the current, the current of a control circuit is larger, the instantaneous heat air flow of a compensation air pipe is controlled according to the detected current of the control circuit, so that the water content of the raw coal after secondary drying is consistent, the crushing grinding quality is ensured, when the raw coal in the next stage is dried, the water vapor generated by the raw coal subjected to secondary drying in the first part is in countercurrent flow into the detection travel, the water vapor subjected to secondary drying in the first part is mixed with the water vapor subjected to primary drying in the second part, the water content of the raw coal subjected to primary drying in the second part is increased, the current value of the control circuit is greatly increased, the current value corresponding to the water content generated after secondary drying in the first part is firstly removed, the current value of the control circuit is obtained, and the outlet air quantity of the compensation air pipe is correspondingly adjusted.
As optimization, the grinding roller is provided with a plurality of material storage cavities, and the diameters of the material storage cavities are smaller than the diameters of standard coal dust;
when grinding, the following steps: the grinding convex surface faces to the material storage cavity on the grinding roller at the other side. Through grinding convex surface and the collection chamber of arranging in opposite directions in the grinding process, if the buggy granule is greater than and hides the material chamber, carry out the breakage to the buggy through grinding convex surface, and partial particle diameter is less than standard buggy diameter, falls into in the collection chamber in the grinding process, forces to discharge downwards, prevents that less buggy from being located and causing many friction lubrication between grinding roller and raw coal, influences grinding efficiency.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the plurality of circumferentially arranged grinding convex surfaces are pressed on the surface of the raw coal, so that the local acting force is improved, and the crushing efficiency of the raw coal is improved; the hot gas is sent into a detection stroke of a coal dropping pipe, raw coal in the detection stroke is subjected to primary drying, so that moisture outside the raw coal is evaporated, the evaporated gas is low in density and is diffused upwards, when water vapor enters between a positive plate and a negative plate in a detection cavity, the air conductivity is increased, the moisture content of the raw coal is monitored in real time, the drying quality is ensured, and excessive energy supply and excessive energy consumption caused by low moisture content are prevented; according to the detected different water contents of the primary dried raw coal, the input current of an input electromagnet is controlled, the interception area of a partition plate is regulated, the energy consumption is reduced, and the instantaneous drying efficiency is improved; the hot air is sent into the main path through the bypass air pipe to heat the pulverized coal, the pulverized coal is blown to move, the pulverized coal and the water vapor are automatically layered under the action of centrifugal force, the water vapor at the inner layer flows out from the drainage port, the subsequent travel is prevented from being entered, the temperature of the primary air is influenced, and the burnout quality of the pulverized coal is reduced; the inner layer is fine coal powder, the outer layer is coarse coal powder, when entering the separation cavity along the spiral channel, the coal powder air flow is split through the guide seat, so that the fine coal powder enters the rear end of the vortex surface to form downward vortex, the coarse coal powder enters the rear end of the vortex surface to form upward vortex, thereby forming a negative pressure area, the blocking block overcomes the gravity of the blocking block and the friction force of the wall surface to ascend, when the coal powder air flow supplied instantaneously is more, the flow speed of the coal powder flowing through the guide surface is faster, the generated negative pressure level is larger, the upward moving distance of the blocking block is larger, the heat of the fine coal powder vortex entering through the regulating groove is increased, the primary air temperature is increased, and the burnout efficiency is ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic general construction of the present invention;
FIG. 2 is a schematic view of the power transmission of the grinding roller of the present invention;
FIG. 3 is an enlarged view of part A of the view of FIG. 1;
FIG. 4 is a schematic diagram of the detection assembly of the present invention;
FIG. 5 is a schematic diagram of the compensation assembly of the present invention;
FIG. 6 is a H-H cross-sectional view of the view of FIG. 1 in accordance with the present invention;
FIG. 7 is an enlarged view of part B of the view of FIG. 1;
FIG. 8 is a P-P cross-sectional view of the view of FIG. 7;
in the figure: 1-shell, 11-crushing chamber, 12-guide channel, 121-main channel, 122-spiral channel, 123-drainage channel, 124-separation chamber, 13-regulating groove, 2-guiding device, 21-guiding seat, 211-parallel surface, 212-guiding surface, 213-vortex surface, 22-detection component, 221-positive plate, 222-negative plate, 223-power supply, 23-compensation component, 231-baffle, 232-electromagnet, 233-pretension spring, 24-compensation air pipe, 241-compensation chamber, 25-blocking piece, 26-overgrinding air pipe, 27-diversion plate, 3-crushing device, 31-grinding roller, 311-storage cavity, 312-grinding convex surface, 32-driving motor, 4-coal feeder, 5-coal dropping pipe, 51-detection stroke, 52-drying stroke, 6-bypass air pipe and 7-air preheater.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides the technical scheme that:
as shown in figure 1, a medium speed coal mill for low energy consumption type coal fired boiler, including casing 1, guiding device 2, breaker 3 and feeder 4, casing 1 and guiding device 2 pipeline intercommunication, be equipped with crushing chamber 11 on the casing 1, breaker 3 is arranged in crushing chamber 11, feeder 4 export is equipped with coal drop pipe 5, feeder 4 passes through coal drop pipe 5 and casing 1 to be connected, coal drop pipe 5 lower extreme and crushing chamber 11 pipeline intercommunication, guiding device 2 and coal drop pipe 5 are connected, guiding device 2 includes overground tuber pipe 26, overground tuber pipe 26 keeps away from coal drop pipe 5 one end and is equipped with air pre-heater 7, air pre-heater 7 export is through overground tuber pipe 26 and coal drop pipe 5 pipeline intercommunication, air pre-heater 7 export still is equipped with bypass tuber pipe 6, bypass tuber pipe 6 and casing 1 pipeline intercommunication.
The shell 1 is used as a main installation base for installing other devices, raw coal is supplied through the coal feeder 4, raw coal is conveyed into the crushing cavity 11 through the coal dropping pipe 5, raw coal is ground through the built-in crushing device 3, hot air flow guiding is performed through the flow guiding device 2, gas heating is performed through the air preheater 7, heated air is guided through the bypass air pipe 6 and the overgrinding air pipe 26, hot air is conveyed into the coal dropping pipe 5 through the overgrinding air pipe 26, so that raw coal in the coal dropping pipe 5 is heated and dried, external moisture of the raw coal is evaporated, hot air is conveyed to the outlet of the medium-speed coal mill through the bypass air pipe 6, ground coal dust is secondarily dried, the speed of the ground coal dust is accelerated, the circulation speed is increased, the separation of water vapor and the coal dust is facilitated, the primary air temperature entering the boiler is increased, the combustion in the boiler is more stable, the combustion efficiency of the coal dust is improved, the combustion efficiency of the boiler is ensured, and the energy consumption is reduced.
As shown in fig. 1-4, the crushing device 3 comprises two grinding rolls 31, the two grinding rolls 31 are arranged in a crushing cavity 11, driving motors 32 are respectively arranged at the end parts of the two grinding rolls 31, the two driving motors 32 are fixedly connected with the crushing cavity 11, the output rotation directions of the two driving motors 32 are opposite, a plurality of grinding convex surfaces 312 are arranged along the circumferential direction of the grinding rolls 31, a plurality of grinding convex surfaces 312 are arranged in an array manner, and the contact position of the two grinding rolls 31 is downward in a rotation direction;
the flow guiding device 2 further comprises a detection component 22, a detection stroke 51 is arranged on the coal dropping pipe 5, a detection cavity is arranged at the upper end of the detection stroke 51, the detection component 22 is arranged in the detection cavity, the detection component 22 comprises a positive plate 221, a negative plate 222 and a power supply 223, the positive plate 221 and the negative plate 222 are oppositely arranged, and the positive plate 221 and the negative plate 222 are respectively electrically connected with a terminal of the power supply 223.
The crushing device 3 comprises two grinding rollers 31 which are meshed and ground in a centering manner, the grinding rollers 31 are arranged in a crushing cavity 11, each grinding roller 31 is driven by a driving motor 32, the two grinding rollers 31 are oppositely rotated, the close ends of the two grinding rollers 31 are grinding ends, raw coal is ground, a plurality of grinding convex surfaces 312 which are arranged in the circumferential direction are pressed and connected to the surface of the raw coal, the local acting force is improved, the crushing efficiency of the raw coal is improved, the meshed parts are rotated downwards, crushed coal dust can fall into the lower side of the crushing cavity 11 under the action of dead weight, accumulation at the upper end of the meshed parts of the two grinding rollers 31 is prevented, dynamic friction lubrication is caused, crushing quality is influenced, hot air is fed into a detection stroke 51 of a coal dropping pipe 5 through an overgrinding air pipe 26, the raw coal in the detection stroke 51 is subjected to primary drying, the evaporated moisture of the raw coal is enabled to be smaller in density, and is dispersed upwards, air is used for insulation between a positive plate 221 and a negative plate 222, when the water vapor enters between the positive plate 221 and the negative plate 222 in the detection cavity, the air current is increased along with the increase of the air current, the electric conductivity is increased, the electric conductivity is kept unchanged, the water content is increased, the power consumption is increased, the energy consumption is reduced, and the quality is prevented from being increased, and the energy consumption is increased, and the quality is increased.
As shown in fig. 4-5, the flow guiding device 2 further includes a compensation component 23 and a compensation air pipe 24, a drying stroke 52 is disposed on the coal dropping pipe 5, the compensation air pipe 24 is in pipeline communication with the drying stroke 52, one end of the compensation air pipe 24, which is far away from the coal dropping pipe 5, is in pipeline communication with an outlet of the air preheater 7, a compensation chamber 241 is disposed at an outlet of the compensation air pipe 24, the compensation component 23 is disposed in the compensation chamber 241, the compensation component 23 includes a partition 231, an electromagnet 232 and a pre-tightening spring 233, the electromagnet 232 is in fastening connection with the compensation chamber 241, the partition 231 is in sliding connection with the compensation chamber 241, the partition 231 is in ladder-like arrangement, the partition 231 is made of a magnet material, the pre-tightening spring 233 is sleeved on an outer layer of the partition 231, and one end, which is far away from a ladder surface of the partition 231, of the pre-tightening spring 233 is in butt connection with the compensation chamber 241.
The air flow heated by the air preheater 7 is guided by the compensation air pipe 24 and is sent into the drying stroke 52 of the coal dropping pipe 5, the primary dried raw coal is dried secondarily, the compensation component 23 is installed by the compensation chamber 241 on the compensation air pipe 24, the electromagnet 232 is fixed in the compensation chamber 241, the partition plate 231 is made of magnet materials, after the partition plate 231 is electrified, the opposite ends of the electromagnet 232 and the partition plate 231 are different-name magnetic poles, the partition plate 231 is applied with spring force through the pre-tightening spring 233, the partition plate 231 is positioned at a position far away from the electromagnet 232 in an initial state, at the moment, the interception area is the largest, the overflow area is the smallest, the air supply amount of the compensation air pipe 24 per unit time is the smallest, and the input current of the electromagnet 232 is controlled according to the detected different water contents of the primary dried raw coal, so that the magnetic field intensity of the end part of the electromagnet 232 is changed, for example, when the input current is increased, the magnetic pole between the electromagnet 232 and the partition plate 231 is moved to the electromagnet 232 side against the pre-tightening spring 233, the pre-tightening spring 233 is further compressed, so that the quantity of hot air flowing out of the compensation air pipe 24 is increased, and the instantaneous drying efficiency is improved.
As shown in fig. 5, the positive plate 221, the negative plate 222 and the power supply 223 are connected to form a control circuit, and the electromagnet 232 is electrically connected to the control circuit;
when intercepting: the partition 231 moves to a side away from the electromagnet 232, and the shutoff area of the outlet of the compensation duct 24 increases.
The positive plate 221, the negative plate 222 and the power supply 223 are electrically connected to form a control circuit and electrically connected to the electromagnet 232, the water content of raw coal is detected in real time through the magnitude of the current of the control circuit, the air outlet of the compensating air pipe 24 in the secondary drying process is regulated according to the raw coal with different water contents, and the drying effect is regulated, so that the water content of the dried raw coal is kept consistent as much as possible.
As shown in fig. 1 and fig. 6-7, a flow guiding channel 12 is arranged at an outlet at the lower end of a crushing cavity 11, a main channel 121 and a spiral channel 122 are sequentially arranged along the flow direction of internal media in the flow guiding channel 12, a bypass air pipe 6 is communicated with the main channel 121, the main channel 121 is communicated with the crushing cavity 11, the spiral channel 122 is gradually arranged in a spiral way, the spiral channel 122 is close to the main channel 121, the spiral channel 122 is the largest in spiral way, a drainage port 123 is formed in the inner side of the spiral channel 122, the flow guiding device 2 further comprises a flow guiding plate 27, the flow guiding plate 27 is obliquely arranged, the flow guiding plate 27 is located at the position of the drainage port 123, and an included angle between the flow guiding plate 27 and the wall surface of the spiral channel 122 faces the main channel 121.
The broken coal dust is guided by the guide channel 12, the main channel 121 is communicated with the breaking cavity 11, the coal dust enters the main channel 121 under the action of gravity, hot air is sent into the main channel 121 through the bypass air pipe 6 to heat the coal dust, so that moisture in the raw coal is dried and evaporated, the air supply direction of the bypass air pipe 6 flows along the main channel 121 towards the spiral channel 122, the coal dust is blown to move, so that the coal dust air flow rapidly flows along the spiral channel 122, the spiral channel gradually changes in arrangement, the coal dust and the water vapor are subjected to centrifugal force along with gradual reduction of the spiral channel, due to the fact that the coal dust density is larger, compared with the water vapor with larger mass, the received centrifugal force is larger, when the coal dust air flow is conveyed, coal dust particles are located on the outer layer of the spiral channel 122, the water vapor is located on the inner side of the spiral channel 122, and is obliquely arranged, when the coal dust air flow approaches to the flow distribution plate 27, the coal dust air flow is automatically layered under the action of the centrifugal force, the water vapor on the inner layer flows upwards along the distribution plate 27, flows out of the air leakage port 123, the coal dust is prevented from entering the subsequent travel, the primary air temperature is influenced, and the coal dust burn-off quality is reduced.
As shown in fig. 6 to 7, the flow guiding device 2 further includes a flow guiding seat 21, a separation cavity 124 is disposed at the end of the spiral channel 122, the flow guiding seat 21 is disposed in the separation cavity 124, parallel surfaces 211 and 212 are disposed on two sides of the flow guiding seat 21 facing the wall surface of the separation cavity 124, the parallel surfaces 211 are located at the lower side of the flow guiding seat 21, the flow guiding surface 212 is located at the upper side of the flow guiding seat 21, a vortex surface 213 is disposed at the junction of the parallel surfaces 211 and the end of the flow guiding surface 212, and the vortex surface 213 and the parallel surfaces 211 are vertically disposed.
The pulverized coal airflow from which the water vapor is separated keeps a layered flowing state under the action of centrifugal force, the inner layer is fine pulverized coal, the outer layer is coarse pulverized coal, when entering the separation cavity 124 along the spiral channel 122, the pulverized coal airflow is split by the guide seat 21, so that the coarse pulverized coal can flow along the parallel surface 211 at the lower side of the guide seat 21, the fine pulverized coal flows along the guide surface 212 at the upper end of the guide seat 21, the stroke length of the guide surface 212 within the same distance is greater than that of the parallel surface 211, the fine pulverized coal enters the rear end of the vortex surface 213 to form downward vortex, and the coarse pulverized coal enters the rear end of the vortex surface 213 to form upward vortex, so that a negative pressure area is formed.
As shown in fig. 7-8, the flow guiding device 2 further comprises a blocking block 25, an adjusting groove 13 is arranged on one side of the flow guiding channel 12, the adjusting groove 13 is communicated with the separating cavity 124, the roughness of the wall surface of the adjusting groove 13 gradually increases from bottom to top, the blocking block 25 is in friction connection with the adjusting groove 13, the blocking block 25 is in a wedge-shaped structure, the diameter of the adjusting groove 13 is gradually changed, and the bottom end of the adjusting groove 13 is communicated with an outlet pipeline of the air preheater 7.
Through the negative pressure area under the vortex state formed, the upper end of the regulating groove 13 points to the vortex formed by fine coal powder, under the negative pressure state, the blocking piece 25 is enabled to overcome the gravity of the blocking piece and the friction force of the wall surface to ascend, the width of the regulating groove 13 is continuously increased in the upward extending process, along with the ascending of the blocking piece 25, the overflow area between the blocking piece 25 and the regulating groove 13 is gradually increased, when the pulverized coal airflow supplied in the moment is more, the flow speed of the pulverized coal flowing through the flow guiding surface 212 is faster, the generated negative pressure level is larger, the upward moving distance of the blocking piece 25 is larger, the bottom end of the regulating groove 13 is communicated with the air preheater 7 through a pipeline, the heat of the vortex of the fine coal powder entering through the regulating groove 13 is increased, the primary air temperature is increased, finally, the fine coal powder is heated firstly, the temperature of the fine coal powder is higher than the temperature of the coarse coal powder, the fine coal powder is ignited firstly in the burning process, and the coarse coal powder is ignited through the fine coal powder, and the full burning efficiency is ensured.
Preferably, the detection stroke 51 is located at the upper end of the drying stroke 52. In the coal falling process, raw coal is subjected to primary drying through a detection stroke 51 through an overgrinding air pipe 26, the detected water content of the raw coal is represented by the current, the current of a control circuit is larger, the instantaneous heat air flow of a compensation air pipe 24 is controlled according to the detected current of the control circuit, so that the water content of the raw coal after secondary drying is consistent, the crushing grinding quality is ensured, when the raw coal in the next stage is dried, the water vapor generated by the raw coal subjected to secondary drying in the first part is in countercurrent flow into the detection stroke 51, the water vapor subjected to primary drying in the first part is mixed with the water vapor subjected to primary drying in the second part, the water content of the raw coal subjected to primary drying in the second part is increased, the current value of the control circuit is greatly increased, the current value of the control circuit is firstly removed the current value corresponding to the water content generated after the secondary drying in the first part, the corresponding water content of the second part is obtained, and the outlet air quantity of the compensation air pipe 24 is correspondingly adjusted.
As optimization, the grinding roller 31 is provided with a plurality of material hiding cavities 311, and the diameter of each material hiding cavity 311 is smaller than that of standard coal dust;
when grinding, the following steps: the grinding convexity 312 faces the stock solution cavity 311 on the other side grinding roller 31. Through grinding convex surface 312 and hiding material chamber 311 that the in-process of grinding was arranged in opposite directions, if the buggy granule is greater than hiding the material chamber, carries out the breakage through grinding convex surface 312 to the buggy, and partial particle diameter is less than standard buggy diameter, falls into in hiding material chamber 311 in the in-process of grinding, forces to discharge downwards, prevents that less buggy from being located and causes many friction lubrication between grinding roller 31 and the raw coal, influences grinding efficiency.
The working principle of the invention is as follows: the hot gas is sent into a detection stroke 51 of a coal dropping pipe 5, raw coal in the detection stroke 51 is subjected to primary drying, moisture outside the raw coal is evaporated, the evaporated gas has smaller density and diffuses upwards, when water vapor enters between a positive plate 221 and a negative plate 222 in a detection cavity, the air conductivity is increased and the conductivity is increased along with the increase of the air flow humidity, and the current value generated on a circuit is increased, so that the moisture content of the raw coal is monitored in real time; in the initial state, the partition 231 is located at a position far from the electromagnet 232, at this time, the intercepting area is the largest, the overflow area is the smallest, the air supply amount of the compensating air duct 24 per unit time is the smallest, and the input current to the electromagnet 232 is controlled according to the detected different water contents of the primary dried raw coal, so that the magnetic field intensity at the end part of the electromagnet 232 is changed; the hot air is sent into the main path 121 through the bypass air pipe 6 to heat the coal dust, the coal dust is blown to move, so that the coal dust air flow quickly flows along the spiral path 122, the coal dust and the water vapor are subjected to centrifugal force along with gradual reduction of the spiral path, due to the fact that the coal dust density is larger and the centrifugal force is larger compared with the water vapor in comparison with the coal dust with larger mass, when the coal dust air flow is conveyed, coal dust particles are positioned on the outer layer of the spiral path 122, the water vapor is positioned on the inner side of the spiral path 122, the splitter plate 27 is positioned on the inner side of the spiral path 122 and is obliquely arranged, when the coal dust air flow approaches to the splitter plate 27, the coal dust air flow is automatically layered under the effect of the centrifugal force, the water vapor on the inner layer flows upwards along the splitter plate 27 and flows out of the leakage port 123, and the follow-up stroke is prevented; the layered flow state is kept under the action of centrifugal force, the inner layer is fine coal powder, the outer layer is coarse coal powder, when the fine coal powder enters the separation cavity 124 along the spiral channel 122, the pulverized coal airflow is split through the guide seat 21, so that the coarse coal powder can flow along the parallel surface 211 at the lower side of the guide seat 21, the fine coal powder flows along the guide surface 212 at the upper end of the guide seat 21, the stroke length of the guide surface 212 within the same distance is longer than that of the parallel surface 211, the fine coal powder enters the rear end of the vortex surface 213 to form downward vortex, the coarse coal powder enters the rear end of the vortex surface 213 to form upward vortex, so that a negative pressure area is formed, the blocking block 25 overcomes the gravity of the blocking force and the friction force of the wall surface to ascend, when the pulverized coal airflow supplied in the moment is more, the faster the pulverized coal airflow flowing through the guide surface 212, the generated negative pressure level is larger, the upward moving distance of the blocking block 25 is larger, and the heat entering the fine coal vortex through the regulating groove 13 is increased.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A medium speed coal mill for low energy consumption type coal-fired boiler is characterized in that: the medium speed coal mill comprises a shell (1), a flow guiding device (2), a crushing device (3) and a coal feeder (4), wherein the shell (1) is communicated with the flow guiding device (2) through a pipeline, a crushing cavity (11) is formed in the shell (1), the crushing device (3) is arranged in the crushing cavity (11), a coal dropping pipe (5) is arranged at an outlet of the coal feeder (4), the coal feeder (4) is connected with the shell (1) through the coal dropping pipe (5), the lower end of the coal dropping pipe (5) is communicated with the crushing cavity (11) through the pipeline, the flow guiding device (2) is connected with the coal dropping pipe (5), the flow guiding device (2) comprises an overgrinding air pipe (26), one end of the overgrinding pipe (26) is far away from the coal dropping pipe (5) and is provided with an air preheater (7), an outlet of the air preheater (7) is communicated with the coal dropping pipe (5) through the overgrinding pipe (26), and a bypass air pipe (6) is further arranged at an outlet of the air preheater (7) and is communicated with the shell (1) through the pipeline;
the crushing device (3) comprises two grinding rollers (31), wherein the two grinding rollers (31) are arranged in the crushing cavity (11), driving motors (32) are respectively arranged at the end parts of the two grinding rollers (31), the two driving motors (32) are fixedly connected with the crushing cavity (11), the output rotation directions of the two driving motors (32) are opposite, a plurality of grinding convex surfaces (312) are arranged along the circumferential direction of the grinding rollers (31), a plurality of grinding convex surfaces (312) are arranged in an array, and the contact positions of the two grinding rollers (31) are downwards rotated;
the flow guiding device (2) further comprises a detection component (22), a detection stroke (51) is arranged on the coal dropping pipe (5), a detection cavity is arranged at the upper end of the detection stroke (51), the detection component (22) is arranged in the detection cavity, the detection component (22) comprises a positive plate (221), a negative plate (222) and a power supply (223), the positive plate (221) and the negative plate (222) are oppositely arranged, and the positive plate (221) and the negative plate (222) are respectively connected with the wiring end of the power supply (223).
2. The medium speed coal pulverizer for a low energy consumption coal-fired boiler of claim 1, wherein: the air guide device is characterized in that the air guide device (2) further comprises a compensation component (23) and a compensation air pipe (24), a drying stroke (52) is arranged on the coal dropping pipe (5), the compensation air pipe (24) is communicated with a drying stroke (52) pipeline, one end of the coal dropping pipe (5) is far away from the compensation air pipe (24) and an air preheater (7) outlet pipeline is communicated, a compensation chamber (241) is arranged at the outlet of the compensation air pipe (24), the compensation component (23) is arranged in the compensation chamber (241), the compensation component (23) comprises a partition plate (231), an electromagnet (232) and a pre-tightening spring (233), the electromagnet (232) is fixedly connected with the compensation chamber (241), the partition plate (231) is in sliding connection with the compensation chamber (241), the partition plate (231) is arranged in a ladder-shaped mode, the outer layer of the partition plate (231) is sleeved with the pre-tightening spring (233), and the pre-tightening spring (233) is far away from one end of the ladder surface of the partition plate (231) and the compensation chamber (241) in a propped mode.
3. The medium speed coal pulverizer for a low energy consumption coal-fired boiler of claim 2, wherein: the positive plate (221), the negative plate (222) and the power supply (223) are connected into a control circuit, and the electromagnet (232) is electrically connected with the control circuit;
when intercepting: the partition plate (231) moves to the side far away from the electromagnet (232), and the shutoff area of the outlet of the compensating air pipe (24) is increased.
4. A medium speed coal mill for a low energy consumption coal fired boiler as claimed in claim 3, wherein: the utility model discloses a crushing chamber (11), including broken cavity, bypass tuber pipe (6) and broken cavity, broken cavity (11) lower extreme export is equipped with guide way (12), guide way (12) are equipped with main road (121) and screw road (122) in proper order along inside medium flow direction, bypass tuber pipe (6) and main road (121) intercommunication, main road (121) and broken cavity (11) intercommunication, screw road (122) screw diameter gradual change sets up, and screw road (122) are close to main road (121) screw diameter biggest, and screw road (122) inboard is equipped with drainage mouth (123), guiding device (2) still include flow distribution plate (27), flow distribution plate (27) slope is arranged, and flow distribution plate (27) are located drainage mouth (123) position, contained angle between flow distribution plate (27) and screw road (122) wall is towards main road (121).
5. The medium speed coal pulverizer for a low energy consumption coal-fired boiler of claim 4, wherein: the flow guiding device is characterized in that the flow guiding device (2) further comprises a flow guiding seat (21), a separating cavity (124) is arranged at the tail end of the spiral channel (122), the flow guiding seat (21) is arranged in the separating cavity (124), parallel surfaces (211) and flow guiding surfaces (212) are respectively arranged on two sides of the flow guiding seat (21) towards the wall surface of the separating cavity (124), the parallel surfaces (211) are located on the lower side of the flow guiding seat (21), the flow guiding surfaces (212) are located on the upper side of the flow guiding seat (21), vortex surfaces (213) are arranged at the junction of the tail ends of the parallel surfaces (211) and the flow guiding surfaces (212), and the vortex surfaces (213) and the parallel surfaces (211) are vertically arranged.
6. The medium speed coal pulverizer for a low energy consumption coal-fired boiler of claim 5, wherein: the flow guiding device is characterized in that the flow guiding device (2) further comprises a blocking block (25), an adjusting groove (13) is formed in one side of the flow guiding channel (12), the adjusting groove (13) is communicated with the separating cavity (124), the wall surface roughness of the adjusting groove (13) gradually increases from bottom to top, the blocking block (25) is in friction connection with the adjusting groove (13), the blocking block (25) is in a wedge-shaped structure, the diameter of the adjusting groove (13) is gradually changed, and the bottom end of the adjusting groove (13) is communicated with an outlet pipeline of the air preheater (7).
7. The medium speed coal pulverizer for a low energy consumption coal-fired boiler of claim 6, wherein: the detection stroke (51) is positioned at the upper end of the drying stroke (52).
8. The medium speed coal pulverizer for a low energy consumption coal fired boiler of claim 7, wherein: a plurality of material storage cavities (311) are arranged on the grinding roller (31), and the diameter of each material storage cavity (311) is smaller than that of standard coal dust;
when grinding, the following steps: the grinding convexity (312) faces to a material hiding cavity (311) on the grinding roller (31) at the other side.
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| CN202137003U (en) * | 2011-05-28 | 2012-02-08 | 山东省电力学校 | Fine grinding device of storage type coal pulverizing system |
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| CN105879666A (en) * | 2016-05-18 | 2016-08-24 | 苏州鼎德电环保科技有限公司 | High-voltage electro-catalytic discharging reactor |
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| CN211502754U (en) * | 2019-12-25 | 2020-09-15 | 湖州南太湖电力科技有限公司 | Uniform coal feeding device for CFB boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202137003U (en) * | 2011-05-28 | 2012-02-08 | 山东省电力学校 | Fine grinding device of storage type coal pulverizing system |
| CN104549693A (en) * | 2014-12-15 | 2015-04-29 | 西安西热锅炉环保工程有限公司 | Medium-speed coal mill and medium-speed coal milling method suitable for high-moisture lignite |
| CN105879666A (en) * | 2016-05-18 | 2016-08-24 | 苏州鼎德电环保科技有限公司 | High-voltage electro-catalytic discharging reactor |
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Denomination of invention: A medium speed coal mill for low energy consumption coal-fired boilers Granted publication date: 20230912 Pledgee: Jiangsu Changshu Rural Commercial Bank Co.,Ltd. Taizhou Branch Pledgor: JIANGSU HUIFENG RENHE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2024980007711 |