CN117019314A - A high-efficient coal pulverizer constructs for thermal power - Google Patents

A high-efficient coal pulverizer constructs for thermal power Download PDF

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Publication number
CN117019314A
CN117019314A CN202310976169.XA CN202310976169A CN117019314A CN 117019314 A CN117019314 A CN 117019314A CN 202310976169 A CN202310976169 A CN 202310976169A CN 117019314 A CN117019314 A CN 117019314A
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CN
China
Prior art keywords
grinding
coal
screening
fixedly connected
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310976169.XA
Other languages
Chinese (zh)
Inventor
范世祥
侯建军
王科
赵家雨
鲁超
孙奇勇
张晗毅
陆柏锋
乔剑峰
鞠凤元
孙鸣春
高旭
石俊龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baotou No3 Thermal Power Plant Of North United Power Co ltd
Original Assignee
Baotou No3 Thermal Power Plant Of North United Power Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baotou No3 Thermal Power Plant Of North United Power Co ltd filed Critical Baotou No3 Thermal Power Plant Of North United Power Co ltd
Priority to CN202310976169.XA priority Critical patent/CN117019314A/en
Publication of CN117019314A publication Critical patent/CN117019314A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/007—Mills with rollers pressed against a rotary horizontal disc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—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
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/30—Passing gas through crushing or disintegrating zone the applied gas acting to effect material separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The invention provides a high-efficiency coal grinding mechanism for thermal power generation, which relates to the technical field of coal grinding mechanisms and comprises a coal grinding mechanism main body and a screening and processing mechanism before coal grinding, wherein the discharge end of the screening and processing mechanism before coal grinding is connected with the feed end of the coal grinding mechanism main body, the screening and processing mechanism before coal grinding is used for processing coal into coal particles with qualified particle sizes, the coal particles with qualified particle sizes are input into the coal grinding mechanism main body for grinding, and the coal grinding mechanism main body is used for grinding the coal particles with qualified particle sizes into coal powder with qualified particle sizes. According to the invention, coal is firstly put into a screening and processing mechanism before grinding, the coal is processed into the coal particles with qualified particle size, and then the coal particles with qualified particle size are input into a main body of the coal grinding mechanism for grinding, so that the powder outlet time periods of the same batch of coal are unified, the sufficient flow of the coal powder at the outlet end of the coal grinding mechanism in each time period is ensured, and the problem that the power generation efficiency of a power plant is influenced due to insufficient supply of the coal powder is avoided.

Description

A high-efficient coal pulverizer constructs for thermal power
Technical Field
The invention relates to the technical field of coal grinding mechanisms, in particular to a high-efficiency coal grinding mechanism for thermal power generation.
Background
When coal is used as fuel in a thermal power plant, a high-efficiency coal mill mechanism is generally adopted to grind coal into fine powder so as to improve combustion efficiency and energy utilization rate, the coal mill is core equipment in a coal grinding system and is used for crushing and grinding raw coal into required fine powder, and common coal mills comprise a ball mill (coal ball mill) and a vertical coal mill (coal vertical mill) which crush and grind coal through rollers or ball milling bodies so that coal particles reach required fineness requirements;
the existing coal grinding mechanism lacks a screening processing mechanism before coal grinding, so that the particle size difference of coal put into the coal grinding mechanism is larger when coal is ground, the grinding duration of coal with smaller particle size is shorter, the grinding duration of coal with larger particle size is longer, the powder outlet time periods of the same batch of coal are different, and finally, the coal powder flow of the outlet end of the coal grinding mechanism in each time period is insufficient, and the power generation efficiency of a power plant can be seriously influenced due to the insufficient supply quantity of coal powder in unit time.
Disclosure of Invention
The invention provides a high-efficiency coal grinding mechanism for thermal power generation, which is used for solving at least one technical problem.
In order to solve the technical problems, the invention discloses a high-efficiency coal grinding mechanism for thermal power generation, which comprises a coal grinding mechanism main body and a pre-coal grinding screening and processing mechanism, wherein the discharge end of the pre-coal grinding screening and processing mechanism is connected with the feed end of the coal grinding mechanism main body, the pre-coal grinding screening and processing mechanism is used for processing coal into qualified coal particles with the particle size, the qualified coal particles with the particle size are input into the coal grinding mechanism main body for grinding, and the coal grinding mechanism main body is used for grinding the qualified coal particles with the particle size into qualified coal powder.
Preferably, the pre-coal grinding screening and processing mechanism comprises a primary screening and processing mechanism and a secondary screening and processing mechanism, wherein the primary screening and processing mechanism is used for carrying out primary crushing and screening on coal and conveying the coal into the secondary screening and processing mechanism, and the secondary screening and processing mechanism is used for carrying out secondary crushing and screening on the coal and conveying the coal into the main body of the coal grinding mechanism.
Preferably, the first-stage screening processing mechanism comprises a frame, fixedly connected with driving motor in the frame, driving motor output fixedly connected with first band pulley, fixedly connected with first processing casing in the frame, rotate in the frame and be connected with first oar axle, fixedly connected with second band pulley and third band pulley on the first oar axle, first band pulley and second band pulley pass through first connection band pulley connection, a plurality of first broken paddles of epaxial fixedly connected with of first oar, a plurality of first broken paddles are located first processing casing, a plurality of first broken paddles fixedly connected with first screen cloth under in the first processing casing, first screen cloth below rotates and is connected with first defeated material auger, fixedly connected with fourth band pulley on the first defeated material auger, fourth band pulley passes through second connection band pulley connection with the third band pulley, first defeated material auger output is located second-stage screening processing mechanism.
Preferably, the second-stage screening processing mechanism comprises a second processing shell, a second screen is arranged in the second processing shell, the first material conveying auger is located under the second screen, the aperture of the second screen is identical to that of the first screen, a partition plate is fixedly connected in the second processing shell, a second paddle shaft and an intermediate rotating shaft are rotationally connected on the partition plate, a plurality of second crushing paddles and a first gear are fixedly connected on the second paddle shaft, a second gear is fixedly connected on the intermediate rotating shaft, the first gear and the second gear are meshed with each other, one end of the intermediate rotating shaft, far away from the second processing shell, is rotationally connected on a frame, one end of the intermediate rotating shaft, far away from the second processing shell, is fixedly connected with a fifth belt pulley, a sixth belt pulley is fixedly connected on the first paddle shaft, and the fifth belt pulley and the sixth belt pulley are connected through a third connecting belt pulley.
Preferably, the coal grinding machine further comprises a feeding fan, the feeding fan is arranged on the second machining shell, an auger mounting plate is arranged in the second machining shell, a second conveying auger is connected to the auger mounting plate in a rotating mode, an auger driving motor is fixedly connected to the second machining shell, the output end of the auger driving motor is fixedly connected with the second conveying auger, the input end of the feeding fan is arranged below the auger mounting plate, the output end of the feeding fan is arranged above the auger mounting plate, a coal particle conveying port is formed in the second machining shell, a coal conveying pipe is arranged at the coal particle conveying port, and the output end of the coal conveying pipe is located at the feeding end of the coal grinding machine main body.
Preferably, the coal grinding mechanism main body comprises a bottom mounting box, a grinding disc is rotationally connected to the bottom mounting box, a grinding disc driving assembly is arranged in the bottom mounting box, the output end of the grinding disc driving assembly is connected with the grinding disc, a sealing cylinder is fixedly connected to the bottom mounting box, a grinding disc is connected to the sealing cylinder in a sliding manner up and down, a cyclone centrifuge is arranged on the sealing cylinder, the output end of a screening processing mechanism before grinding coal is positioned above a feeding port of the cyclone centrifuge, a powder outlet fan is fixedly connected to the bottom mounting box, and an air outlet of the powder outlet fan is positioned at the bottom of the grinding disc;
the grinding groove is arranged in the grinding disc, the side wall of the grinding disc is fixedly connected with a plurality of fixed blocks, and a screening groove is formed between every two adjacent fixed blocks.
Preferably, the grinding disc driving assembly comprises a grinding disc driving motor, the grinding disc driving motor is fixedly connected to the inner wall of a bottom installation box, the output end of the grinding disc driving motor is fixedly connected with a first meshing gear, the inner side of the bottom installation box is rotationally connected with a first rotating shaft and a second rotating shaft, the axes of the first rotating shaft and the second rotating shaft are mutually perpendicular, a first bevel gear is fixedly connected to the first rotating shaft, the output end of the first rotating shaft is fixedly connected to the grinding disc, a second bevel gear and a second meshing gear are fixedly connected to the second rotating shaft, the first meshing gear and the second meshing gear are meshed with each other, and the first bevel gear and the second bevel gear are meshed with each other.
Preferably, the grinding disc bottom is fixedly connected with a scraper blade, a coal recovery hole is formed in the bottom mounting box, a recovery sloping plate is arranged below the coal recovery hole, and the output end of the recovery sloping plate is positioned at the inlet end of the screening processing mechanism before grinding coal.
Preferably, the grinding disc comprises a triangular mounting disc, a blanking hole is formed in the middle of the triangular mounting disc, a plurality of screw nuts are fixedly connected to the triangular mounting disc, a plurality of electric screws are rotationally connected to the sealing cylinder, the screw nuts are in threaded connection with the electric screws, a plurality of grinding wheels are mounted on the triangular mounting disc and are in rolling connection with the grinding wheels in the grinding groove, a grinding pressure automatic regulating system is arranged on the grinding disc and is used for regulating the grinding pressure of the grinding wheels, and the grinding pressure automatic regulating system comprises:
the distance sensors are respectively arranged on the corresponding grinding wheels and are used for detecting the distance between the lowest point of each grinding wheel and the grinding groove;
the pressure sensors are respectively arranged on the corresponding grinding wheels and are used for detecting the pressure born by each grinding wheel;
the device comprises a controller and a calculating unit, wherein the controller is electrically connected with the calculating unit and the electric screw, the calculating unit is electrically connected with a plurality of distance sensors and a plurality of pressure sensors, the calculating unit is used for calculating downward compensated displacement of the triangular mounting disc based on detection values of the plurality of distance sensors and the plurality of pressure sensors, and the controller is used for controlling the electric screw to rotate based on calculation values of the calculating unit, so that the triangular mounting disc moves downwards by x under the action of a screw nut L Is a distance of (2);
the calculating unit calculates a downward compensated displacement of the triangular mounting plate based on detection values of the plurality of distance sensors and the plurality of pressure sensors, including:
wherein x is L For the downward compensating displacement of the triangular mounting disc, epsilon is the material strength of the grinding wheel, b is the wheel width of the grinding wheel, and h i For the distance between the ith grinding wheel and the grinding groove in the initial state, namely the distance between the ith grinding wheel and the grinding groove before the start of each working period of the grinding pressure automatic regulating system, namely the detection value of a distance sensor, d x The particle size of the coal particles is preset, e is a natural number, the value is 2.71, F i For the detection value of the corresponding pressure sensor on the ith grinding wheel, F 0 The pressure is preset for the reference of the grinding wheels, pi is the circumference rate, the value is 3.14, d is the diameter of the grinding disc, n is the number of the grinding wheels, and F 0 For a preset grinding pressure of the grinding wheel, delta x Preset grinding efficiency for the grinding disc, delta 0 The reference grinding efficiency of the mill is that lg is the base 10 logarithm, x 0 The displacement is compensated for the datum of the grinding disc.
Preferably, the cyclone centrifuge comprises a connecting cylinder body, the connecting cylinder body is arranged on the sealing cylinder, a first screening funnel and a second screening funnel are arranged in the connecting cylinder body, the second screening funnel is located above the first screening funnel, a plurality of deflector plates are arranged on the first screening funnel, the coal feeding cylinder penetrates through the first screening funnel and the second screening funnel, a powder feeding cylinder 5 is arranged on the second screening funnel, and a plurality of powder feeding pipes are arranged on the circumference of the powder feeding cylinder 5.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, coal is firstly put into a screening and processing mechanism before grinding, the coal is processed into coal particles with qualified particle size, and then the coal particles with qualified particle size are input into a main body of a coal grinding mechanism for grinding, so that the screening and processing mechanism before grinding has the effect of unifying the particle sizes of the coal, the powder discharging time periods of the same batch of coal are uniformed, the sufficient flow of the coal powder at the outlet end of the coal grinding mechanism in each time period is ensured, and the problem that the power generation efficiency of a power plant is seriously influenced due to the insufficient supply quantity of the coal powder in unit time is avoided;
2. the coal grinding mechanism main body has a simple structure, can simultaneously screen coal particles and multilevel coal powder, and has simple components, ingenious design and complete functions;
3. the automatic grinding pressure regulating system for every other detection period regulates the grinding pressure once, if the downward compensating displacement of the triangular mounting disc calculated by the calculating unit is x L The controller controls the electric screw to rotate, so that the triangular mounting plate moves downwards by x under the action of the screw nut L Thereby adjusting the grinding pressure in time so that the grinding efficiency of the grinding wheel is maintained at the preset grinding efficiency delta of the grinding wheel x Within the range.
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 diagram of the overall structure of the present invention.
FIG. 2 is a schematic diagram of a screening and processing mechanism before coal grinding.
FIG. 3 is a schematic diagram of a first screening process according to the present invention.
FIG. 4 is a cross-sectional view of the screening and processing mechanism before coal grinding according to the invention.
Fig. 5 is a schematic view of the main structure of the coal grinding mechanism of the invention.
Fig. 6 is a schematic view of the structure of the triangular mounting plate of the present invention.
Fig. 7 is a top view of the triangular mounting plate of the present invention.
FIG. 8 is a schematic view of the cyclone centrifuge of the present invention.
In the figure: 1. a coal mill mechanism body; 10. a bottom mounting box; 100. grinding disc; 1000. a sealing cylinder; 1001. a grinding disc; 1002. a cyclone centrifuge; 1003. a powder discharge fan; 1004. a millstone driving motor; 1005. a first meshing gear; 1006. a first rotating shaft; 1007. a second rotating shaft; 1008. a first bevel gear; 1009. a second bevel gear; 101. a second meshing gear; 1010. a coal recovery hole; 1011. recovering the sloping plate; 1012. a scraper; 1013. grinding the groove; 1014. a fixed block; 1015. a screening groove; 102. a triangular mounting plate; 1020. a lead screw nut; 1021. an electric screw; 1022. a grinding wheel; 103. a connecting cylinder; 1030. a first screening hopper; 1031. a second screening hopper; 1032. a deflector; 1033. a powder feeding pipe; 1034. a coal feed cylinder; 1035. a powder feeding cylinder; 2. screening and processing mechanisms before coal grinding; 200. a first-stage screening processing mechanism; 2000. a frame; 2001. a driving motor; 2002. a first pulley; 2003. a first paddle shaft; 2004. a second pulley; 2005. a third pulley; 2006. a first connecting pulley; 2007. a first crushing paddle; 2008. a first machining housing; 2009. a first screen; 202. a first material conveying auger; 2020. a fourth pulley; 2021. a second connecting belt wheel; 201. a secondary screening processing mechanism; 2010. a second machining housing; 2011. a second screen; 2012. a partition plate; 2013. a second paddle shaft; 2014. a second crushing paddle; 2015. a first gear; 2016. a middle rotating shaft; 2017. a second gear; 2018. a fifth pulley; 2019. a sixth pulley; 203. a third connecting belt pulley; 2030. a feeding fan; 2031. a packing auger mounting plate; 2032. a second material conveying auger; 2033. a screw drive motor; 2034. a coal particle delivery port; 2035. a coal conveying pipe.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the invention solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between the embodiments may be combined with each other, but it is necessary to base that a person skilled in the art can implement the combination of technical solutions, when the combination of technical solutions contradicts or cannot be implemented, should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present invention.
The invention provides the following examples
Example 1
The embodiment of the invention provides a gynecological tumor brachytherapy positioning treatment table, which is shown in figures 1-8, and comprises a coal grinding mechanism main body 1 and a coal grinding pre-screening processing mechanism 2, wherein the discharge end of the coal grinding pre-screening processing mechanism 2 is connected with the feed end of the coal grinding mechanism main body 1, the coal grinding pre-screening processing mechanism 2 is used for processing coal into qualified coal particles with the particle size, the qualified coal particles with the particle size are input into the coal grinding mechanism main body 1 for grinding, and the coal grinding mechanism main body 1 is used for grinding the qualified coal particles with the particle size into qualified coal dust with the particle size.
The working principle and beneficial effects of the technical scheme are as follows: according to the invention, coal is firstly put into the screening processing mechanism 2 before grinding, the coal is processed into the coal particles with qualified particle size, and then the coal particles with qualified particle size are input into the main body 1 of the coal grinding mechanism for grinding, so that the screening processing mechanism 2 before grinding has the effect of unifying the particle sizes of the coal, the powder discharging time periods of the same batch of coal are uniformed, the sufficient flow of the coal powder at the outlet end of the coal grinding mechanism in each time period is ensured, and the problem that the power generation efficiency of a power plant is seriously influenced due to the insufficient supply quantity of the coal powder in unit time is avoided.
Example 2
On the basis of the embodiment 1, the screening processing mechanism 2 before coal grinding comprises a primary screening processing mechanism 200 and a secondary screening processing mechanism 201, wherein the primary screening processing mechanism 200 is used for carrying out primary crushing screening on coal and conveying the coal into the secondary screening processing mechanism 201, and the secondary screening processing mechanism 201 is used for carrying out secondary crushing screening on the coal and conveying the coal into the coal grinding mechanism main body 1;
the first-stage screening processing mechanism 200 comprises a frame 2000, a driving motor 2001 is fixedly connected to the frame 2000, a first belt wheel 2002 is fixedly connected to the output end of the driving motor 2001, a first processing shell 2008 is fixedly connected to the frame 2000, a first belt wheel 2003 is rotatably connected to the frame 2000, a second belt wheel 2004 and a third belt wheel 2005 are fixedly connected to the first belt wheel 2003, the first belt wheel 2002 and the second belt wheel 2004 are connected through a first connecting belt wheel 2006, a plurality of first crushing paddles 2007 are fixedly connected to the first shaft 2003, a plurality of first crushing paddles 2007 are located in the first processing shell 2008, a first screen 2009 is fixedly connected to the right lower portion of the first crushing paddles 2007 in the first processing shell 2008, a first conveying auger 202 is rotatably connected to the lower portion of the first screen 2009, a fourth belt wheel 2020 is fixedly connected to the first conveying auger 202, the fourth belt wheel 2020 is connected to the third belt wheel 2005 through a second connecting belt wheel 2021, and the output end of the first conveying auger 202 is located in the second-stage screening processing mechanism 201.
The working principle and beneficial effects of the technical scheme are as follows: when coal is subjected to primary crushing and screening, the coal is poured into a first processing shell 2008, a driving motor 2001 drives a first belt pulley 2002 to rotate, the first belt pulley 2002 drives a first connecting belt pulley 2006 to drive, the first connecting belt pulley 2006 drives a second belt pulley 2004 to rotate, the second belt pulley 2004 rotates to drive a first paddle shaft 2003 to rotate, the first paddle shaft 2003 rotates to drive a plurality of first crushing paddles 2007 to crush the coal, when the coal is crushed to a particle size larger than a preset particle size, the coal is left on a first screen 2009, when the coal is crushed to a particle size smaller than the preset particle size, the coal falls into a space where the first conveying auger 202 is located from the first screen 2009, and as the first paddle shaft 2003 rotates to drive a second connecting belt pulley 2021 to drive, the second connecting belt pulley 2021 drives a fourth belt pulley 2020 to rotate, the fourth belt pulley 2020 rotates to drive the first conveying auger 202 to rotate, and the first conveying auger 202 rotates to convey the fallen coal particles into a secondary coal screening processing mechanism 201.
Example 3
On the basis of embodiment 2, the secondary screening machining mechanism 201 includes a second machining housing 2010, a second screen 2011 is disposed in the second machining housing 2010, the first material conveying auger 202 is located right below the second screen 2011, the aperture of the second screen 2011 is identical to that of the first screen 2009, a partition 2012 is fixedly connected in the second machining housing 2010, a second rotor shaft 2013 and an intermediate rotating shaft 2016 are rotatably connected to the partition 2012, a plurality of second crushing rotors 2014 and a first gear 2015 are fixedly connected to the second rotor shaft 2013, a second gear 2017 is fixedly connected to the intermediate rotating shaft 2016, the first gear 2015 is meshed with the second gear 2017, one end of the intermediate rotating shaft 2016, which is far away from the second machining housing 2010, is rotatably connected to the frame 2000, a fifth pulley 2018 is fixedly connected to one end of the intermediate rotating shaft 2016, which is far away from the second machining housing 2010, a sixth pulley 2019 is fixedly connected to the first shaft 2003, and the fifth pulley 2018 is connected to the sixth pulley 2019 through a third connection 203.
The working principle and beneficial effects of the technical scheme are as follows: the coal processed by the first-stage screening processing mechanism 200 is input into the second-stage screening processing mechanism 201 through the first conveying auger 202, and then is gradually piled up below the second screen 2011 until the coal below the second screen 2011 is piled up on the second screen 2011, and then enters the upper part of the second screen 2011 through the second screen 2011, and as the first paddle shaft 2003 rotates to drive the sixth belt wheel 2019 to rotate, the sixth belt wheel 2019 rotates to drive the third connecting belt wheel 203 to drive, the third connecting belt wheel 203 drives the fifth belt wheel 2018 to rotate, the fifth belt wheel 2018 rotates to drive the middle rotating shaft 2016 to rotate, the middle rotating shaft 2016 rotates to drive the second gear 2017 to rotate, the second gear 2017 rotates to drive the first gear 2015 to rotate, the first gear 2015 rotates to drive the second paddle shaft 2013 to rotate, and the second paddle 2014 rotates to crush the coal particles above the second screen 2011 again.
Example 4
On the basis of embodiment 3, the coal grinding machine further comprises a feeding fan 2030, the feeding fan 2030 is mounted on the second processing shell 2010, an auger mounting plate 2031 is arranged in the second processing shell 2010, a second conveying auger 2032 is rotatably connected to the auger mounting plate 2031, an auger driving motor 2033 is fixedly connected to the second processing shell 2010, the output end of the auger driving motor 2033 is fixedly connected with the second conveying auger 2032, the input end of the feeding fan 2030 is mounted below the auger mounting plate 2031, the output end of the feeding fan 2030 is mounted above the auger mounting plate 2031, a coal particle conveying opening 2034 is formed in the second processing shell 2010, a coal conveying pipe 2035 is mounted at the coal particle conveying opening 2034, and the output end of the coal conveying pipe 2035 is located at the feeding end of the coal grinding machine main body 1.
The working principle and beneficial effects of the technical scheme are as follows: coal particles crushed again by the second crushing paddles 2014 can be conveyed to the auger mounting plate 2031 to be gradually piled up under the action of the feeding fan 2030 after being crushed to a preset particle size, after the coal particles on the auger mounting plate 2031 are piled up to a certain degree, the auger driving motor 2033 is started to drive the second conveying auger 2032 to rotate, the second conveying auger 2032 conveys the coal particles to the coal particle conveying port 2034, and then the coal particles are conveyed to the feeding end of the coal mill mechanism main body 1 through the coal conveying pipe 2035.
Example 5
On the basis of embodiment 1, a coal grinding mechanism main body 1 comprises a bottom mounting box 10, a grinding disc 100 is rotatably connected to the bottom mounting box 10, a grinding disc driving assembly is arranged in the bottom mounting box 10, the output end of the grinding disc driving assembly is connected with the grinding disc 100, a sealing cylinder 1000 is fixedly connected to the bottom mounting box 10, a grinding disc 1001 is vertically and slidably connected to the sealing cylinder 1000, a cyclone 1002 is arranged on the sealing cylinder 1000, the output end of a screening processing mechanism 2 before grinding coal is positioned above a feeding port of the cyclone 1002, a powder outlet fan 1003 is fixedly connected to the bottom mounting box 10, and an air outlet of the powder outlet fan 1003 is positioned at the bottom of the grinding disc 100;
a grinding groove 1013 is formed in the grinding disc 100, a plurality of fixing blocks 1014 are fixedly connected to the side wall of the grinding disc 100, and screening grooves 1015 are formed between adjacent fixing blocks 1014;
the scraper 1012 is fixedly connected to the bottom of the grinding disc 100, a coal recovery hole 1010 is formed in the bottom mounting box 10, a recovery inclined plate 1011 is arranged below the coal recovery hole 1010, and the output end of the recovery inclined plate 1011 is positioned at the inlet end of the screening processing mechanism 2 before grinding coal.
The working principle and beneficial effects of the technical scheme are as follows: the coal particles at the output end of the screening processing mechanism 2 before coal grinding fall into a cyclone centrifuge 1002 of the coal grinding mechanism main body 1 and fall onto a grinding disc 100 under the action of gravity, then the grinding disc 1001 slides up and down to adjust the distance from the working end of the grinding disc 1001 to the grinding disc 100, then the grinding disc 100 starts to rotate, under the mutual cooperation of the grinding disc 100 and the grinding disc 1001, the coal particles on the grinding disc 100 are ground to form coal dust, wherein the coal dust with the particle size reaching the standard moves upwards to the cyclone centrifuge 1002 to be screened under the action of a dust outlet fan 1003, the coal dust meeting the specification is output to the coal grinding mechanism main body 1 along the cyclone centrifuge 1002, the coal dust not meeting the specification falls onto the grinding disc 100 again along the cyclone centrifuge 1002 to be ground again, the dust outlet fan 1003 cannot blow up, and the coal particles with the larger particle size and the influence of the centrifugal force can be thrown outwards under the action of the centrifugal force, fall onto a bottom mounting box 10 through a screening groove 1015, and are pushed into a coal recovery hole 1010 under the action of a scraper 1012 along with the rotation of the grinding disc 100, and finally the coal dust is recovered to be processed again along the dust outlet fan 1011 to the coal recovery mechanism 2 before the screening mechanism is processed;
the coal grinding mechanism main body 1 has a simple structure, can simultaneously screen coal particles and multilevel coal powder, and has simple components, ingenious design and complete functions.
Example 6
On the basis of embodiment 5, the grinding disc driving assembly comprises a grinding disc driving motor 1004, the grinding disc driving motor 1004 is fixedly connected to the inner wall of the bottom mounting box 10, the output end of the grinding disc driving motor 1004 is fixedly connected with a first meshing gear 1005, the axes of the first rotating shaft 1006 and the second rotating shaft 1007 are in rotary connection with each other in the bottom mounting box 10, a first bevel gear 1008 is fixedly connected to the first rotating shaft 1006, the output end of the first rotating shaft 1006 is fixedly connected to the grinding disc 100, a second bevel gear 1009 and a second meshing gear 101 are fixedly connected to the second rotating shaft 1007, the first meshing gear 1005 and the second meshing gear 101 are meshed with each other, and the first bevel gear 1008 and the second bevel gear 1009 are meshed with each other.
The working principle and beneficial effects of the technical scheme are as follows: when the millstone driving assembly works, the millstone driving motor 1004 is started to drive the first meshing gear 1005 to rotate, the first meshing gear 1005 drives the second meshing gear 101 to rotate, the second meshing gear 101 rotates to drive the second rotating shaft 1007 to rotate, the second rotating shaft 1007 rotates to drive the second bevel gear 1009 to rotate, the second bevel gear 1009 rotates to drive the first bevel gear 1008 to rotate, the first bevel gear 1008 rotates to drive the first rotating shaft 1006 to rotate, and the first rotating shaft 1006 rotates to drive the millstone 100 to rotate.
Example 7
On the basis of embodiment 5, grinding disc 1001 includes triangle mounting disc 102, triangle mounting disc 102 middle part is equipped with unloading hole 1023, fixedly connected with a plurality of lead screw nuts 1020 on the triangle mounting disc 102, sealed section of thick bamboo 1000 internal rotation is connected with a plurality of electric screw 1021, lead screw nut 1020 threaded connection is on electric screw 1021, install a plurality of grinding wheels 1022 on the triangle mounting disc 102, grinding wheels 1022 roll connection is in grinding groove 1013, be equipped with grinding pressure automatic regulating system on the grinding disc 1001, grinding pressure automatic regulating system is used for adjusting the grinding pressure of grinding wheels 1022, grinding pressure automatic regulating system includes:
a plurality of distance sensors respectively mounted on the corresponding grinding wheels 1022 for detecting a distance between a lowest point of each grinding wheel 1022 to the grinding groove 1013;
a plurality of pressure sensors respectively mounted on the corresponding grinding wheels 1022 for detecting the pressure received by each grinding wheel 1022;
the controller is electrically connected with the calculating unit and the electric screw 1021, the calculating unit is electrically connected with the plurality of distance sensors and the plurality of pressure sensors, the calculating unit is used for calculating downward compensated displacement of the triangular mounting plate 102 based on detection values of the plurality of distance sensors and the plurality of pressure sensors, and the controller is used for controlling the electric screw 1021 to rotate based on calculation values of the calculating unit, so that the triangular mounting plate 102 moves downwards by x under the action of the screw nut 1020 L Is a distance of (2);
the calculating unit calculating the downward-compensated displacement of the triangular mounting plate 102 based on the detection values of the plurality of distance sensors and the plurality of pressure sensors includes:
wherein x is L For downward compensating displacement of the triangle mounting plate 102, ε is the material strength of the grinding wheel 1022, b is the wheel width of the grinding wheel 1022, h i For the distance between the i-th grinding wheel 1022 and the grinding tank 1013 in the initial state, i.e. the distance between the i-th grinding wheel 1022 and the grinding tank 1013 before the start of each working period of the grinding pressure automatic adjusting system, i.e. the detection value of the distance sensor, d x The particle size of the coal particles is preset, e is a natural number, the value is 2.71, F i For the detection value F of the corresponding pressure sensor on the ith grinding wheel 1022 0 Is the reference preset pressure of the grinding wheels 1022, pi is the circumference rate, the value is 3.14, d is the diameter of the grinding disc 100, n is the number of the grinding wheels 1022, and F 0 For a preset grinding pressure, delta, of the grinding wheel 1022 x For a preset grinding efficiency, delta, of the mill 1001 0 The reference grinding efficiency of the mill 1001, lg, is the base 10 logarithm, x 0 The displacement is compensated for the reference of the rolling disc 1001.
The working principle and beneficial effects of the technical scheme are as follows: the grinding pressure automatic regulating system regulates the grinding pressure once every other detection period, if the calculation unit calculatesCalculated displacement of the triangular mounting plate 102 compensated downward is x L The controller controls the electric screw 1021 to rotate so that the triangular mounting plate 102 moves downwards by x under the action of the screw nut 1020 L Thereby adjusting the grinding pressure in time such that the grinding efficiency of the grinding wheel 1001 is maintained at a preset grinding efficiency delta of the grinding wheel 1001 x In the range, in calculating the downward-compensated displacement of the triangular mounting plate 102, the detection values of the distance sensor and the pressure sensor on each grinding wheel 1022 are used respectively and the influence of the material of the grinding wheel 1022 and the wheel width is considered, so that the accuracy of the final calculation result is ensured.
Example 8
On the basis of embodiment 5, the cyclone 1002 comprises a connecting cylinder 103, the connecting cylinder 103 is installed on a sealing cylinder 1000, a first screening funnel 1030 and a second screening funnel 1031 are installed in the connecting cylinder 103, the second screening funnel 1031 is located above the first screening funnel 1030, a plurality of deflector plates 1032 are installed on the first screening funnel 1030, a coal feeding cylinder 1034 penetrates through the first screening funnel 1030 and the second screening funnel 1031, a powder feeding cylinder 1035 is arranged on the second screening funnel 1031, and a plurality of powder feeding pipes 1033 are arranged on the circumference of the powder feeding cylinder 1035.
The working principle and beneficial effects of the technical scheme are as follows: the ascending coal powder enters the space formed by the first screening funnel 1030 and the inner wall of the connecting cylinder 103, then enters the first screening funnel 1030 through the gap between two adjacent deflector plates 1032, the deflector plates 1032 play a role in guiding, so that the coal powder rotates in the first screening funnel 1030, the coal powder with larger particle size and heavier weight is impacted by centrifugal force in the rotating process to lose kinetic energy under the effect of inertia and then returns to the grinding disc again, the coal powder is ground again, the coal powder with smaller particle size and lighter weight continuously ascends into the second screening funnel 1031 and the powder feeding cylinder 1035 under the influence of inertia, and finally is fed into the combustion chamber through the powder feeding tube 1033 for thermal power generation.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A high-efficient coal pulverizer constructs for thermal power, its characterized in that: the coal grinding machine comprises a coal grinding mechanism main body (1) and a coal grinding pre-screening processing mechanism (2), wherein the discharge end of the coal grinding pre-screening processing mechanism (2) is connected with the feed end of the coal grinding mechanism main body (1), the coal grinding pre-screening processing mechanism (2) is used for processing coal into qualified coal particles with particle sizes, the qualified coal particles with particle sizes are input into the coal grinding mechanism main body (1) to be ground, and the coal grinding mechanism main body (1) is used for grinding the qualified coal particles with particle sizes into qualified coal powder with particle sizes.
2. The efficient coal grinding mechanism for thermal power generation according to claim 1, wherein: the coal grinding pre-screening processing mechanism (2) comprises a primary screening processing mechanism (200) and a secondary screening processing mechanism (201), wherein the primary screening processing mechanism (200) is used for carrying out primary crushing screening on coal and conveying the coal into the secondary screening processing mechanism (201), and the secondary screening processing mechanism (201) is used for carrying out secondary crushing screening on the coal and conveying the coal into the coal grinding mechanism main body (1).
3. The efficient coal grinding mechanism for thermal power generation according to claim 2, wherein: first-stage screening processing agency (200) including frame (2000), fixedly connected with driving motor (2001) on frame (2000), driving motor (2001) output fixedly connected with first band pulley (2002), fixedly connected with first processing casing (2008) on frame (2000), rotationally be connected with first oar axle (2003) on frame (2000), fixedly connected with second band pulley (2004) and third band pulley (2005) on first oar axle (2003), first band pulley (2002) and second band pulley (2004) are connected through first connecting band pulley (2006), fixedly connected with a plurality of first broken paddles (2007) on first oar axle (2003), a plurality of first broken paddles (2007) are located first processing casing (2008), a plurality of first broken paddles (2007) are fixedly connected with first screen cloth (2009) in the first processing casing (2008), rotationally be connected with first material auger (202) below first screen cloth (2009), fixedly connected with fourth band pulley (2020) on first material auger (202), fourth band pulley (2020) and third band pulley (202) are located processing agency through first end (2005) of being connected with second band pulley (202).
4. The efficient coal grinding mechanism for thermal power generation according to claim 3, wherein: second grade screening processing agency (201) including second processing casing (2010), be equipped with second screen cloth (2011) in second processing casing (2010), first defeated material auger (202) are located under second screen cloth (2011), second screen cloth (2011) aperture is the same with first screen cloth (2009), fixedly connected with baffle (2012) in second processing casing (2010), rotationally be connected with second oar axle (2013) and intermediate shaft (2016) on baffle (2012), fixedly connected with a plurality of broken oar of second (2014) and first gear (2015) on second oar axle (2013), fixedly connected with second gear (2017) on intermediate shaft (2016), first gear (2015) and second gear (2017) intermeshing, one end that intermediate shaft (2016) kept away from second processing casing (2010) rotates to be connected on frame (2000), and one end that intermediate shaft (2016) kept away from second processing casing (2010) is fixedly connected with fifth (2018), fixedly connected with sixth band pulley (2019) on first oar axle (2003), fifth band pulley (2019) are connected with through between band pulley (203).
5. The efficient coal grinding mechanism for thermal power generation according to claim 4, wherein: still include feed fan (2030), install on second processing casing (2010) feed fan (2030), be equipped with auger mounting panel (2031) in second processing casing (2010), rotate on auger mounting panel (2031) and be connected with second defeated material auger (2032), fixedly connected with auger driving motor (2033) on second processing casing (2010), auger driving motor (2033) output and second defeated material auger (2032) fixed connection, the input of feed fan (2030) is installed in auger mounting panel (2031) below, the output of feed fan (2030) is installed in auger mounting panel (2031) top, coal granule delivery port (2034) have been seted up on second processing casing (2010), coal conveying pipe (2035) are installed to coal granule delivery port (2034) department, coal conveying pipe (2035) output is located the feed end of coal grinding mill mechanism main part (1).
6. The efficient coal grinding mechanism for thermal power generation according to claim 1, wherein: the coal grinding mechanism main body (1) comprises a bottom mounting box (10), a grinding disc (100) is rotationally connected to the bottom mounting box (10), a grinding disc driving assembly is arranged in the bottom mounting box (10), the output end of the grinding disc driving assembly is connected with the grinding disc (100), a sealing cylinder (1000) is fixedly connected to the bottom mounting box (10), a grinding disc (1001) is vertically and slidingly connected to the sealing cylinder (1000), a cyclone centrifuge (1002) is arranged on the sealing cylinder (1000), the output end of a screening processing mechanism (2) before grinding coal is positioned above the feeding port of the cyclone centrifuge (1002), a powder outlet fan (1003) is fixedly connected to the bottom mounting box (10), and the air outlet of the powder outlet fan (1003) is positioned at the bottom of the grinding disc (100);
the grinding disc (100) is internally provided with a grinding groove (1013), the side wall of the grinding disc (100) is fixedly connected with a plurality of fixed blocks (1014), and screening grooves (1015) are formed between adjacent fixed blocks (1014).
7. The efficient coal grinding mechanism for thermal power generation according to claim 7, wherein: the grinding disc driving assembly comprises a grinding disc driving motor (1004), the grinding disc driving motor (1004) is fixedly connected to the inner wall of a bottom mounting box (10), the output end of the grinding disc driving motor (1004) is fixedly connected with a first meshing gear (1005), the bottom mounting box (10) is internally connected with a first rotating shaft (1006) and a second rotating shaft (1007), the axes of the first rotating shaft (1006) and the second rotating shaft (1007) are mutually perpendicular, a first bevel gear (1008) is fixedly connected to the first rotating shaft (1006), the output end of the first rotating shaft (1006) is fixedly connected to the grinding disc (100), a second bevel gear (1009) and a second meshing gear (101) are fixedly connected to the second rotating shaft (1007), the first meshing gear (1005) and the second meshing gear (101) are mutually meshed, and the first bevel gear (1008) and the second bevel gear (1009) are mutually meshed.
8. The efficient coal grinding mechanism for thermal power generation according to claim 6, wherein: the grinding disc (100) bottom fixedly connected with scraper blade (1012), offered coal recovery hole (1010) on bottom mounting box (10), coal recovery hole (1010) below is equipped with retrieves swash plate (1011), retrieves swash plate (1011) output and is located screening processing mechanism (2) entrance point before the grinding.
9. The efficient coal grinding mechanism for thermal power generation according to claim 6, wherein: the grinding disc (1001) comprises a triangular mounting disc (102), a blanking hole (1023) is formed in the middle of the triangular mounting disc (102), a plurality of screw nuts (1020) are fixedly connected to the triangular mounting disc (102), a plurality of electric screws (1021) are rotationally connected to the sealing cylinder (1000), the screw nuts (1020) are in threaded connection with the electric screws (1021), a plurality of grinding wheels (1022) are mounted on the triangular mounting disc (102), the grinding wheels (1022) are in rolling connection with the grinding groove (1013), an automatic grinding pressure adjusting system is arranged on the grinding disc (1001) and used for adjusting the grinding pressure of the grinding wheels (1022), and the automatic grinding pressure adjusting system comprises:
a plurality of distance sensors which are respectively arranged on the corresponding grinding wheels (1022) and are used for detecting the distance between the lowest point of each grinding wheel (1022) and the grinding groove (1013);
the pressure sensors are respectively arranged on the corresponding grinding wheels (1022) and are used for detecting the pressure born by each grinding wheel (1022);
the controller is electrically connected with the calculating unit and the electric screw rod (1021), the calculating unit is electrically connected with the plurality of distance sensors and the plurality of pressure sensors, the calculating unit is used for calculating downward compensated displacement of the triangular mounting plate (102) based on detection values of the plurality of distance sensors and the plurality of pressure sensors, and the controller is used for controlling the electric screw rod (1021) to rotate based on calculation values of the calculating unit, so that the triangular mounting plate (102) moves downwards by x under the action of a screw nut (1020) L Is a distance of (2);
the calculating unit calculates a downward-compensated displacement of the triangular mounting plate (102) based on detection values of the plurality of distance sensors and the plurality of pressure sensors, including:
wherein x is L For downward compensating displacement of the triangular mounting plate (102), ε is the material strength of the grinding wheel (1022), b is the wheel width of the grinding wheel (1022), h i For the distance between the ith grinding wheel (1022) and the grinding groove (1013) in the initial state, namely the distance between the ith grinding wheel (1022) and the grinding groove (1013) before the start of each working period of the grinding pressure automatic adjusting system, namely the detection value of the distance sensor, d x The particle size of the coal particles is preset, e is a natural number, the value is 2.71, F i For the detection value F of the corresponding pressure sensor on the ith grinding wheel (1022) 0 Is the reference preset pressure of the grinding wheels (1022), pi is the circumference rate, the value is 3.14, d is the diameter of the grinding disc (100), n is the number of the grinding wheels (1022), F 0 For a preset grinding pressure, delta, of the grinding wheel (1022) x For a preset grinding efficiency, delta, of the grinding disc (1001) 0 Is the reference grinding efficiency of the grinding disc (1001), lg is the base 10 logarithm, x 0 The displacement is compensated for the reference of the mill (1001).
10. The efficient coal grinding mechanism for thermal power generation according to claim 6, wherein: cyclone (1002) are including connecting barrel (103), connect barrel (103) and install on sealed section of thick bamboo (1000), connect and install first screening funnel (1030) and second screening funnel (1031) in barrel (103), second screening funnel (1031) are located first screening funnel (1030) top, install a plurality of turn-around plates (1032) on first screening funnel (1030), coal feed section of thick bamboo (1034) run through first screening funnel (1030) and second screening funnel (1031), be equipped with on second screening funnel (1031) and send powder section of thick bamboo (1035), send powder section of thick bamboo (1035) circumference upwards to be equipped with a plurality of powder pipes (1033).
CN202310976169.XA 2023-08-03 2023-08-03 A high-efficient coal pulverizer constructs for thermal power Pending CN117019314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310976169.XA CN117019314A (en) 2023-08-03 2023-08-03 A high-efficient coal pulverizer constructs for thermal power

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310976169.XA CN117019314A (en) 2023-08-03 2023-08-03 A high-efficient coal pulverizer constructs for thermal power

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Publication Number Publication Date
CN117019314A true CN117019314A (en) 2023-11-10

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