CN203750614U - Steel ball coal mill - Google Patents
Steel ball coal mill Download PDFInfo
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- CN203750614U CN203750614U CN201320537739.7U CN201320537739U CN203750614U CN 203750614 U CN203750614 U CN 203750614U CN 201320537739 U CN201320537739 U CN 201320537739U CN 203750614 U CN203750614 U CN 203750614U
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Abstract
The utility model relates to an energy-saving technology of a coal mill, in particular to a steel ball coal mill. The steel ball coal mill comprises a barrel (4), a motor (8) and a reducer (7), wherein the barrel (4) is supported by a bearing (2), steel balls with the diameter phi of 20mm, 25mm and 30mm or with the diameter phi of 40mm, 50mm and 60mm are filled in the barrel (4), the ratio of the steel balls is calculated and determined in virtue of running working condition of the coal mill and the characteristics of the coal. The coal mill is simple in structure, low in electric power consumption and large in output force. In addition, the steel ball adopted in the steel ball coal mill is less in steel consumption and wear-resisting.
Description
Technical field
The utility model belongs to coal pulverizer field of energy-saving technology, specifically relates to a kind of low speed coal mill.
Background technology
Low speed coal mill is the main equipment of heat power station coal dust preparation system.Also be applicable to the pulverized coal preparation systems such as cement industry, metallurgical industry, chemical industry, sugar industry, be widely used in the coal of pulverizing various hardness simultaneously.The effect of low speed coal mill be by dry coal cinder, with liner plate, coal cinder is smashed and is ground into coal dust by the steel ball in the cylindrical shell on low speed coal mill for to boiler combustion.Low speed coal mill is adopted in a large number by domestic and international thermal power plant, and according to statistics, in power plant, low speed coal mill accounts for the more than 60% of all kinds of coal pulverizer total amounts at home.But the shortcoming of low speed coal mill is also apparent, as move complexity, power consumption is high, noise is large, consumption steel many, wearing and tearing more than etc.Low speed coal mill has closely and contacts as safety, the economical operation of its safety of visual plant, economical operation and the whole power plant of power plant.
In recent years, along with the production scale of thermal power generation corporations of China is in continuous expansion, the scarcity of electric coal resource made ature of coal worse and worse, and the grindability of coal also worse and worse, the consumption of liner plate and steel ball constantly increases.In order to ensure to exert oneself and fineness reaches production requirement, in prior art, the way of many enterprises is to take regularly to install additional the mode of major diameter steel ball.But, the mode that installs major diameter steel ball additional makes coal pulverizer inner barrel different-diameter steel ball ratio unreasonable, can not well deal with problems affects pulverizer capacity, makes that unit power consumption of coal pulverizing raises, the power consumption of coal pulverizer rises, power consumption is large, Boiler Economical Operation reduces, and seriously restricts Boiler Economical Operation.
Summary of the invention
For overcoming above-mentioned shortcomings and deficiencies of the prior art, the utility model provide a kind of simple in structure, power consumption is lower and exert oneself larger low speed coal mill.In addition, the steel ball adopting in this low speed coal mill, steel quantity consumption is few, wear-resisting and worn steel ball amount is less.
For achieving the above object, first object of the present utility model is to provide a kind of low speed coal mill, comprises cylindrical shell, motor, reductor, and cylindrical shell is by bearings, and in described cylindrical shell, being filled with diameter is the steel ball between Φ 20-Φ 90.
Preferably, the diameter of the steel ball in described cylindrical shell is Φ 20 ㎜, Φ 25 ㎜, Φ 30 ㎜, and the proportioning of above-mentioned three kinds of diameter steel balls is 1:1:1; Or the diameter of the steel ball in described cylindrical shell is the steel ball of Φ 40 ㎜, Φ 50 ㎜, Φ 60 ㎜, and the proportioning of above-mentioned three kinds of diameter steel balls is 1:1:1.The proportioning of ball is carried out calculative determination by operating condition and the coal property of coal pulverizer.
In above-mentioned arbitrary scheme, preferably, on one end of described cylindrical shell, cover has gear,
In above-mentioned arbitrary scheme, preferably, described motor is by being connected to barrel body rotation described in the driving gear drives on described reductor.
In above-mentioned arbitrary scheme, preferably, slow biography device is installed on described driven wheel.In above-mentioned arbitrary scheme, preferably, described bearing is by the bearing support block fixed support at its two ends.
In above-mentioned arbitrary scheme, preferably, described bearing support block is fixedly mounted on the platen of its underpart.
In above-mentioned arbitrary scheme, preferably, one end of described cylindrical shell is fixedly connected with import hopper, and the other end is fixedly connected with outlet hopper.
In above-mentioned arbitrary scheme, preferably, described import hopper is fixed by described bearing support block and is connected with described cylindrical shell conducting with outlet hopper.
In above-mentioned arbitrary scheme, preferably, the quantity of described motor is one.
In above-mentioned arbitrary scheme, particularly preferably be, the quantity of described motor is two and both sides in described cylindrical shell one end respectively.
In above-mentioned arbitrary scheme, preferably, described motor is direct current generator or alternating current generator.In above-mentioned arbitrary scheme, preferably, described cylindrical shell is segmented overall structure.
In above-mentioned arbitrary scheme, preferably, on the inwall of described cylindrical shell, be covered with waveform liner plate in axial direction.
In above-mentioned arbitrary scheme, preferably, in described cylindrical shell outer circumferential walls, be covered with blimp.
In above-mentioned arbitrary scheme, preferably, the surface of described liner plate is through there being high-abrasive material.For example tungsten carbide.By being used in conjunction with of the coal pulverizer in the utility model and liner plate, described coal pulverizer energy-saving effect can further increase, and coal pulverizer running current can reduce 25%-30%., change after coal pulverizer novel energy-conserving liner plate, lining liner plate life cycle and replacement cycle can extend one times meanwhile.
In above-mentioned arbitrary scheme, preferably, between described liner plate and liner plate, form groove.
In above-mentioned arbitrary scheme preferably, the deep equality between described groove and groove or not etc.
Second object of the present utility model is to provide a kind of preparation method of steel ball, comprises the steps:
A: add tungsten, chromium, manganese, vanadium alloy element on the basis of common high chrome ball in the prior art;
B: described steel ball is processed into by heat treatment: metallographic structure is the superelevation chromium energy-saving wear-resistant steel ball that tempered martensite adds carbide.
Can improve the anti-wear performance of steel ball by the method, have the steel ball of reduction and lose circle rate and percentage of damage, ensure the features such as steel ball grating long-term stability, 24 hours diameter wear extenies of steel ball are lower than 0.033mm.Form by above-mentioned Technology for Heating Processing that more common high chrome ball is more wear-resisting, life cycle is longer.Can further reduce the abrasion of steel ball, its chemical composition and performance refer to following table.
Compared with prior art the utility model has the advantage of: the steel ball matching in cylindrical shell is reasonable, simple in structure, power consumption is lower and it is larger to exert oneself.In addition, the steel ball adopting in this low speed coal mill, steel quantity consumption is few, wear-resisting and worn steel ball amount is less.The steel ball diameter wear extent of 24 hours is lower than 0.033mm.Can further reduce the abrasion of steel ball, improve the anti-wear performance of steel ball, there is the steel ball of reduction and lose circle rate and percentage of damage, ensure the features such as steel ball grating long-term stability.
Brief description of the drawings
Fig. 1 is the main TV structure schematic diagram according to low speed coal mill one preferred embodiment of the present utility model;
Fig. 2 is the plan structure schematic diagram embodiment illustrated in fig. 1 according to low speed coal mill of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further elaborated to explanation;
Embodiment 1:
As shown in Figures 1 and 2, a kind of low speed coal mill, comprises cylindrical shell 4, supports bearing 2, motor 8, the reductor 7 of cylindrical shell 4, and in described cylindrical shell 4, being filled with diameter is between Φ 20-Φ 90.What in the present embodiment, the steel ball in described cylindrical shell 4 was loaded is that diameter is the steel ball that Φ 20, Φ 25, Φ 30 ratios are 1:1:1.The proportioning of steel ball is carried out calculative determination by operating condition and the coal property of coal pulverizer.On one end of described cylindrical shell 4, cover has gear, in the outer circumferential walls that is arranged on described cylindrical shell 4 that gear is fixed.Between cylindrical shell 4 and described gear, there is no relative motion and between the two rigidity contact.Described motor 8 is preferably direct current generator as PTO, and its quantity is at least one.Described direct current generator is connected with the gear in described deceleration 7 by motor shaft.Specifically the driven wheel on described reductor 7 directly drives described cylindrical shell 4 to rotate.Slow biography device 9 is installed on described driven wheel.
Described bearing 2 supports by the fixing system of bearing support block at its two ends, and described bearing support block is fixedly mounted on the platen 5 of its bottom.Described platen 5 has shock-absorbing function, and for example, the platen that cement is made or other have the material of shock-absorbing function.Be fixedly connected with import hopper 6 in one end of described cylindrical shell 4, the other end is fixedly connected with outlet hopper 1.Described import hopper 6 is fixed by described bearing support block and is connected with described cylindrical shell 4 conductings with outlet hopper 1.
As shown in Figure 2, in the present embodiment, the overall structure that described cylinder 4 bodies are segmented is covered with waveform liner plate in axial direction on the inwall of cylindrical shell 4, and described liner material quality is antiwear high-chromium cast iron, has strengthened the anti-wear performance of described liner plate.Between described liner plate and liner plate, form groove, the deep equality between described groove and groove or not etc.Particularly, the degree of depth of described groove equals or the diameter that is slightly larger than described cylindrical shell 4 interior steel balls has vital effect for the quality of coal dust and the derivation of steel ball.Because in the present embodiment, the diameter of steel ball is divided into 30 millimeters of Φ 20 ㎜, Φ 25 ㎜, Φ.So the distance between described liner plate and liner plate also or the degree of depth of the groove forming between described liner plate and liner plate is respectively 20 ㎜, 25 ㎜, 30 ㎜.The groove of the different depth forming between the liner plate between described different distance or liner plate and liner plate is distributed on the inwall of described cylindrical shell 4.Setting has improved the production efficiency of coal pulverizer to greatest extent like this, is particularly conducive in the time that described coal pulverizer is overhauled, the convenient steel ball from the interior derivation different-diameter of described cylindrical shell 4.
In the outer circumferential walls of described cylindrical shell 4, cover has blimp.Described blimp reason be, in the time that described cylindrical shell 4 rotates, because the rolling of the steel ball in cylindrical shell 4 and the inwall of described cylindrical shell 4 and described liner plate produce collision noise, environment is produced to harm.The effect of described blimp is just to reduce the pollution of this noise.
Embodiment 2:
As shown in Figures 1 and 2, a kind of low speed coal mill, comprises cylindrical shell 4, supports bearing 2, motor 8, the reductor 7 of cylindrical shell 4, and in described cylindrical shell 4, being filled with diameter is the steel ball between Φ 20-Φ 90.In the present embodiment, what the steel ball in described cylindrical shell 4 was loaded is that diameter is Φ 40 ㎜, Φ 50 ㎜, Φ 60 ㎜, the steel ball that ratio is 1:1:1.On one end of described cylindrical shell 4, cover has gear, in the outer circumferential walls that is positioned on described cylindrical shell 4 that gear is fixed.Between cylindrical shell 4 and described gear, there is no relative motion and between the two rigidity contact.Described motor 8 is preferably alternating current generator as PTO, and the quantity of described alternating current generator 8 is two and both sides in described cylindrical shell 4 one end respectively.Described two alternating current generators are connected with respectively reductor 7.Two alternating current generators drive described cylindrical shell 4 rotations to improve mechanical stability as power source jointly, have improved to greatest extent the efficiency of coal pulverizer.Specifically, the alternating current generator of described cylindrical shell 4 both sides is as rotation, and alternating current generator is connected with described reductor 7 by the turning cylinder of itself, and the gear on the driven wheel in described reductor and described cylindrical shell 4 is connected with a joggle.The rotation of described alternating current generator 8, drives described cylindrical shell 4 to rotate.Steel ball in described cylindrical shell 4 is made tumbling motion, clashes into process coal cinder or other arbitrary substances in cylindrical shell, realizes the function of powder process.
Described bearing 2 supports by the fixing system of bearing support block at its two ends, and described bearing support block is fixedly mounted on the platen 5 of its bottom.Described platen 5 has shock-absorbing function, and for example, the platen that cement is made or other have the material of shock-absorbing function.Be fixedly connected with import hopper 6 in one end of described cylindrical shell 4, the other end is fixedly connected with outlet hopper 1.Described import hopper 6 is fixed by described bearing support block and is connected with described cylindrical shell 4 conductings with outlet hopper 1.
In the present embodiment, described cylinder 4 bodies are monolithic construction, on the axial direction of the inwall of cylindrical shell 4, be covered with waveform liner plate, the surface that scribbles high-abrasive material tungsten carbide or described liner plate on the surface of described liner plate through Quenching Treatment also or described liner plate adopts antiwear high-chromium cast iron material to make.Strengthen the anti-wear performance of described liner plate.Between described liner plate and liner plate, form groove, the deep equality between described groove and groove or not etc.Particularly, the degree of depth of described groove equals or the diameter that is slightly larger than described cylindrical shell 4 interior steel balls has vital effect for the quality of coal dust and the derivation of steel ball.Because in the present embodiment, the diameter of steel ball is divided into 60 millimeters of Φ 40 ㎜, Φ 50 ㎜, Φ.So the distance between described liner plate and liner plate also or the degree of depth of the groove forming between described liner plate and liner plate is respectively 40 ㎜, 50 ㎜, 60 ㎜.The groove of the different depth forming between the liner plate between described different distance or liner plate and liner plate is distributed on the inwall of described cylindrical shell 4.Setting has improved the production efficiency of coal pulverizer to greatest extent like this, is particularly conducive in the time that described coal pulverizer is overhauled, the convenient steel ball from the interior derivation different-diameter of described cylindrical shell 4.In the outer circumferential walls of described cylindrical shell 4, cover has blimp.Described blimp reason be, in the time that described cylindrical shell 4 rotates, because the rolling of the steel ball in cylindrical shell 4 and the inwall of described cylindrical shell 4 and described liner plate produce collision noise, environment is produced to harm.The effect of described blimp is just to reduce the pollution of this noise.
Embodiment 3:
A preparation method for steel ball, comprises the steps:
A: add tungsten, chromium, manganese, vanadium alloy element on the basis of common high chrome ball in the prior art;
B: described steel ball is processed into by heat treatment: metallographic structure is the superelevation chromium energy-saving wear-resistant steel ball that tempered martensite adds carbide.
By said method and in conjunction with the specific embodiment of the utility model, the application's applicant has done following related experiment, proved to adopt equipment, steel ball in the utility model patent application, improved the efficiency of coal pulverizer, power consumption obtained obvious reduction and exerted oneself larger.In addition, the steel ball adopting in this low speed coal mill, steel quantity consumption is few, wear-resisting and worn steel ball amount is less.
Specific experiment is reported as follows:
1. experimental basis
" pulverized coal preparation system performance test " DL/T467-2004
" thermal power plant pulverized coal preparation system designing and calculating technical stipulation " DL/T5145-2002
" cast grinding ball " GB/T17445-1998
2. Brief Introduction on Equipment
1.1, boiler introduction
The international ten Li Quan power plant #6 boilers of Hua electricity, model is HG-1021/18.2-YM9 type, subcritical, single reheat, Natural Circulation drum boiler, design fire coal is bituminous coal.Coal burner is wide adjusting, swingable, single flow, four jiaos of layouts, 24 points six layers, when oepration at full load, puts into operation six layers; Superheater is that Pyatyi is arranged, i.e. ceiling and enclosure wall superheater, and low temperature superheater, point shield, rear screen superheater and high temperature superheater, two-stage desuperheating water regulates steam temperature; Reheater is three grades of layouts, i.e. wall type reheater, and middle temperature screen formula reheater and high temperature reheater, adopt tilting burner to add one-level emergency spray and regulate reheat steam temperature; Economizer is that one-level coiled pipe is arranged; Air preheater is two points of storehouse Junker formulas, 29-VI (B)-1630 type.
The main design parameters of boiler is in table 1.
Table 1 boiler main design parameters
| Sequence number | Project | Unit | ECR | BMCR |
| 1 | Main steam flow | t/h | 908 | 1021 |
| 2 | Main steam pressure | t/h | 17.27 | 18.28 |
| 3 | Main steam temperature | MPa | 540 | 540 |
| 4 | Reheated steam flow | MPa | 739.8 | 824.75 |
| 5 | Reheated steam inlet pressure | MPa | 3.46 | 3.86 |
| 6 | Reheated steam outlet pressure | MPa | 3.27 | 3.65 |
| 7 | Reheated steam inlet temperature | ℃ | 316.5 | 321.9 |
| 8 | Reheated steam outlet temperature | ℃ | 540 | 540 |
| 9 | Feed temperature | ℃ | 272.1 | 279.4 |
| 10 | Cold air temperature | ℃ | 20 | 20 |
| 11 | Heater outlet temperature | ℃ | 330 | 330 |
| 12 | Exhaust gas temperature | ℃ | 129 | 135 |
| 13 | Calculate the thermal efficiency | ℃ | 92.1 | 92.16 |
| 14 | Ensure the thermal efficiency | % | 91 | 91 |
| 15 | Fuel Consumption | t/h | 132.5 | 141.5 |
Boiler design uses bituminous coal, and coal characteristic is in table 2.
Table 2 designs coal property
2.2.2, pulverized coal preparation system brief introduction
The international ten Li Quan power plant #6 boiler milling systems of Hua electricity adopt 4 350/600 Ball Mills, two-stage separation, negative pressure operation, middle warehouse formula, transporting pulverized coal with exhaust gas.Design parameter is listed in table 3-table 7.
Table 3 coal pulverizer technical specification
Table 4 apparatus for separating fine powder from coarst powder specification
| Project | Mill separator |
| Model | HW-4300 |
| Diameter | 4300mm |
Table 5 pulverized-coal collector specification
| Project | Pulverized-coal collector |
| Model | HW—XB2Y—3250 |
| Diameter | 3250mm |
Table 6 feeder specification
| Pattern | CS2024 | |
| Coal-supplying amount | t/h | 55 |
| Granularity | mm | ＜50 |
| Drive motors capacity | kW | 3 |
| Cleaning capacity motor | kW | 0.37 |
Table 7 mill exhauster specification
2.3, superelevation chromium energy-saving wear-resistant alloy steel ball
The superelevation chromium energy-saving wear-resistant alloy steel ball of being produced by sky, Shandong vertical development Group Co.,Ltd is on the basis of common high chrome ball, to add the alloying elements such as appropriate tungsten, chromium, manganese, vanadium, forming metallographic structure by special Technology for Heating Processing is the superelevation chromium energy-saving wear-resistant steel ball that tempered martensite adds carbide, and more common high chrome ball is more wear-resisting, life cycle is longer.24 hours diameter wear extenies of steel ball are lower than 0.033mm.Can further reduce the abrasion of steel ball, improve the anti-wear performance of steel ball, there is the steel ball of reduction and lose circle rate and percentage of damage, ensure the features such as steel ball grating long-term stability.Its chemical composition and performance are in table 8.
The novel superelevation chromium of table 8 energy-saving wear-resistant steel ball performance parameter
3, pilot project
3.1. complementary test
the liner plate inspection of D coal pulverizer;
common high chrome ball checks;
superelevation chromium energy-saving wear-resistant alloy steel ball checks;
demarcate exerting oneself of feeder;
demarcate the ventilation of pulverized coal preparation system;
3..2. pulverized coal preparation system nominal output test under plain ball and conventional stage formula formula
At present, the international ten Li Quan power plants of Hua electricity adopt common high chrome ball, and steel ball specification is Ф 40mm, tri-kinds of Ф 50mm and Ф 60mm, and the grating mode of three kinds of steel balls is Ф 40: Ф 50: Ф 60=1:1:1.Install under plain ball and conventional stage formula formula the energy consumption under test pulverized coal preparation system nominal output additional.
3.3. pulverized coal preparation system EIAJ test under plain ball and conventional stage formula formula
Installing under plain ball and conventional stage formula formula the energy consumption under test pulverized coal preparation system EIAJ additional.
3.4. pulverized coal preparation system nominal output test under Novel steel ball and fancy grade formula formula
Installing novel superelevation chromium energy-saving wear-resistant alloy steel ball additional and under steel ball grating mode, testing the energy consumption under pulverized coal preparation system nominal output after optimizing.
3.5. pulverized coal preparation system EIAJ test under Novel steel ball and fancy grade formula formula
Installing novel superelevation chromium energy-saving wear-resistant alloy steel ball additional and under steel ball grating mode, testing the energy consumption under pulverized coal preparation system nominal output after optimizing.
3.6. the ball of Novel steel ball consumption measuring and calculating
Installing additional under novel superelevation chromium energy-saving wear-resistant alloy steel ball and the grating mode after optimizing, coal pulverizer accumulative total running time exceeded after 1500 hours, according to initial ball load, tip-in amount and the actual measuring and calculating of coal pulverizer accumulation coal-grinding amount ball consumption.
4, experimental condition
1) coal pulverizer body, the defect of mill exhauster, feeder, damper etc. has been eliminated, can normally move;
2) the powder phenomenon of leaking out, leak in pulverized coal preparation system is eliminated;
3) accurately (air quantity, electric current, voltage, pressure, coal amount, temperature point) of the data measuring point verification that need to record.
4) coal-supplying amount metering verification is accurate;
5) boiler wind wind speed is in leveling of cold conditions;
6) the each main and auxiliary function of boiler unit runs well and meets test requirements document;
7) measuring point installation is used in test, and puts up as required scaffold;
8) test is as ready in platform scale, sampling shovel etc. by auxiliary equipment.
9) boiler uses coal close to design coal, and it is stable that coal keeps, and in process of the test, ature of coal excursion is as follows:
Mar ± 2% (absolute error)
Vdaf ± 4.5% (absolute error)
Qnet.v.ar ± 10% (absolute error)
Aar-10%～+ 5% (absolute error)
HGI ± 20% (relative error)
5 experimental measurement content and methods
1) raw coal sampling
Sampling in every 30 minutes 1 time in the pulverized coal preparation system putting into operation, every sub-sampling 1kg, after sampling finishes, is 4 parts by all samples division, every part of about 5kg.Sample position is at feeder observation panel.
2) pulverizer capacity
Adopt the feeder metering device through demarcating to measure exerting oneself of coal pulverizer.
3) coal pulverizer and mill exhauster power measurement
First, electric specialty carries out verification again to the intelligent power table in 6kV station-service switchgear house, then utilizes the input power that calculates coal pulverizer and mill exhauster of the shown electric current of intelligent power table, voltage and power factor in 6kV station-service switchgear house.
4) coal dust sampling
Coal dust samples the sifter place sampling on powder storehouse, sampling in every 15 minutes 1 time in the pulverized coal preparation system putting into operation, and every sub-sampling 0.5kg, after sampling finishes, is 4 parts by all samples division, every part of about 0.5kg.
5) ball of steel ball consumption is calculated:
Calculate and adopt following formula according to the ball consumption of GB steel ball:
In formula: the ball consumption of M-steel ball casting, g/h;
The initial ball load of Q-, t;
Q '-tip-in amount in service, t;
Qh-can reuse steel ball amount, t;
N-accumulative total coal-supplying amount, t.
6) wind pushing temperature, air humidity and atmospheric pressure '
Measure wind pushing temperature and air humidity at air blower inlet with Hygrothermograph, get atmospheric pressure with atmospheric pressure instrumentation, before and after each working condition tests, each surveying record once, is averaged.
7) other service data
By the main service data during thermal technology personnel acquisition test.
To the inspection of lining plate of coal grinder
Installing additional before steel ball, coal pulverizer interior lining panel is checked to the abrasion condition of liner plate, whether have loosening etc., to repair in time.
8) inspection to steel ball
Main extract immediately that steel ball is measured the diameter deviation of steel ball and whether the proportioning of steel ball is correct.
9) demarcation that feeder is exerted oneself
In the situation that feeder difference is exerted oneself, measure the rotating speed of feeder with stopwatch, then feeder is drawn and stopped, on the coal conveyer belt of feeder, measure one meter of long distance, with container and platform scale weighed amount, calculate the coal-supplying amount of feeder and with DCS in coal-supplying amount comparison, calculate correction factor.
10) demarcation of pulverized coal preparation system ventilation
The pulverized coal preparation system of #6 boiler has been installed weary measuring device for gas, in order to improve its accuracy, weary tolerance in DCS is demarcated, first timing signal adopts standard pitot tube to measure weary Pneumatic pressure, calculate weary tolerance and with DCS in weary tolerance comparison, calculate correction factor.
11) unit power consumption of coal pulverizing of coal pulverizer Mill output and pulverized coal preparation system test
Within ature of coal remains on and allows excursion, ensure that fineness of pulverized coal is constant, measure the Mill output of coal pulverizer, calculate pulverized coal preparation system under difference is exerted oneself situation, the unit consumption of coal pulverizer and the unit consumption of pulverized coal preparation system by recording the input power of coal pulverizer and mill exhauster.
6 test arrangements
Before on-test, carried out labor and discussion with the operations staff of power plant, maintainer, energy-conservation specific responsibility people and day vertical company technique personnel, because #6 boiler D coal pulverizer interior lining panel was all changed in September, 2012, stop mill and check discovery, D coal pulverizer interior lining panel is comparatively intact, and the relevant device in D pulverized coal preparation system is in good condition, determine D pulverized coal preparation system to test.
Test process carries out as follows
6.1 complementary tests
whether the test coal that assessment stores meets the requirement of test ature of coal;
liner plate to D coal pulverizer checks;
measuring point and status of equipment to D pulverized coal preparation system check;
plain ball and Novel steel ball are checked;
feeder is exerted oneself and demarcated;
pulverized coal preparation system ventilation is demarcated;
6.2 formal test
After preparation property has been tested, maintainer tests according to the milling system optimized adjustment in early stage the optimum steel ball loading capacity and the proportioning that draw installs steel ball additional, operations staff is according to optimal ventilation amount control mill exhauster inlet baffle and recirculation door aperture, after fineness of pulverized coal is qualified, also stable operation started formal test after 30 minutes, the test of pulverized coal preparation system EIAJ is carried out two hours, the test of pulverized coal preparation system nominal output is carried out 4 hours, after the operation of Novel steel ball ball consumption test request coal pulverizer accumulative total exceedes 1500 hours, calculates according to statistics.Testing sequence is as follows
1) pulverized coal preparation system nominal output test under plain ball and conventional stage formula formula;
2) pulverized coal preparation system EIAJ test under plain ball and conventional stage formula formula;
3) pulverized coal preparation system nominal output test under Novel steel ball and fancy grade formula formula;
4) pulverized coal preparation system nominal output test under Novel steel ball and fancy grade formula formula;
5) ball of Novel steel ball consumption measuring and calculating.
7 result of the tests
7.1 preparation property result of the tests
1) the test coal ature of coal of deposit is comparatively stable, each composition excursion Pass Test requirement.
2) liner plate of #6 boiler D coal pulverizer is comparatively intact, and the status of equipment of D pulverized coal preparation system is good.
3), by grab sample, the diameter deviation of plain ball is at-0.8～1.1mm; The deviation of novel superelevation chromium abrasion-proof steel ball is-0.6～1.1mm.
4) first by thermal technology personnel, feeder is demarcated, what then testing crew feeder had carried out three operating modes gets the raw coal demarcation of weighing on belt, and actual measurement feeder is exerted oneself and shown that with feeder the deviation of exerting oneself is all in ± 0.5%.
5) calibration result of pulverized coal preparation system ventilation is seen the following form to 9
The calibration result of table 9 pulverized coal preparation system ventilation
| Operating mode 1 | Operating mode 2 | Operating mode 3 | |
| Ventilation deviation | -1.02% | -1.45% | 0.86% |
| Calibration coefficient | 1.0103 | 1.0147 | 0.9915 |
Pulverized coal preparation system nominal output test result under 7.2 plain balls and conventional stage formula formula
Installing plain ball useful load additional at #6 boiler D coal pulverizer is 54 tons, and steel ball matching adopts traditional grating ratio Ф 40mm: Ф 50mm: Ф 60mm=1:1:1, pulverized coal preparation system ventilation remains on 92km
3under the operating mode of/h, carry out pulverized coal preparation system nominal output test under plain ball and conventional stage formula formula, after fineness of pulverized coal is qualified, carry out four hours continuously, the service data of test period pulverized coal preparation system sees attached list 1.
Through data processing, the average output of #6 boiler D coal pulverizer is 43.7t/h, the unit power consumption of coal pulverizing of coal pulverizer is 20.57kW.h/t, the unit power consumption of coal pulverizing of mill exhauster is 8.34kW.h/t, under common high chrome ball and conventional stage formula formula, the unit power consumption of coal pulverizing of #6 boiler D pulverized coal preparation system is 28.91kW.h/t, and the coal analysis of duration of test and fineness of pulverized coal are in table 10.
Pulverized coal preparation system nominal output test period ature of coal and coal dust situation under table 10 plain ball and conventional stage formula formula
| Analysis project | Symbol | Unit | Analysis result |
| Particle diameter | mm | 0～30mm | |
| Total moisture | Mt | ％ | 8.4 |
| Air-dried moisture | Mad | ％ | 2.42 |
| As-received ash content | Aar | ％ | 29.74 |
| Dry ash free basis volatile matter | Vdaf | % | 36.01 |
| Air-dried basis sulphur content | St,ad | ％ | 1.67 |
| As-received low heat valve | Ｑnet.v.ar | MJ/kg | 19.21 |
| Ha Shi can grind index | HGI | 77 | |
| Fineness of pulverized coal | R90 | % | 22.3 |
| Fineness of pulverized coal | R200 | % | 3.3 |
Pulverized coal preparation system EIAJ test result under 7.3 plain balls and conventional stage formula formula
After nominal output has been tested, continue to add plain ball, steel ball loading capacity is added to 59 tons of straight maximum charge of balls, ventilation remains under the operating mode of pulverized coal preparation system Maximum Ventilatory Volume carries out, it is qualified by adjustment mill separator baffle plate, fineness of pulverized coal to be adjusted, test is carried out two hours continuously, and the service data of test period pulverized coal preparation system sees attached list 2.
Through data processing, the average output of #6 boiler D coal pulverizer is 48.9t/h, the unit power consumption of coal pulverizing of coal pulverizer is 19.12kW.h/t, the unit power consumption of coal pulverizing of mill exhauster is 10.29kW.h/t, under common high chrome ball and conventional stage formula formula, the unit power consumption of coal pulverizing of #6 boiler D pulverized coal preparation system is 29.49kW.h/t, and the coal analysis of duration of test and fineness of pulverized coal are in table 11.
Pulverized coal preparation system EIAJ test period ature of coal and coal dust situation under table 11 plain ball and conventional stage formula formula
| Analysis project | Symbol | Unit | Analysis result |
| Particle diameter | mm | 0～30mm | |
| Total moisture | Mt | ％ | 8.0 |
| Air-dried moisture | Mad | ％ | 1.66 |
| As-received ash content | Aar | ％ | 27.59 |
| Dry ash free basis volatile matter | Vdaf | % | 38.68 |
| Air-dried basis sulphur content | St,ad | ％ | 1.49 |
| As-received low heat valve | Ｑnet.v.ar | MJ/kg | 20.18 |
| Ha Shi can grind index | HGI | 80 | |
| Fineness of pulverized coal | R90 | % | 22.0 |
| Fineness of pulverized coal | R200 | % | 3.7 |
Pulverized coal preparation system nominal output test result under 7.4 Novel steel balls and fancy grade formula formula
The plain ball of #6 boiler D coal pulverizer is all thrown away, again install novel superelevation chromium energy-saving wear-resistant steel ball additional, steel ball loading capacity is 31.3 tons, and steel ball matching adopts the grating mode after optimizing, and pulverized coal preparation system ventilation remains on 92km
3under the operating mode of/h, carry out pulverized coal preparation system nominal output test under superelevation chromium energy-saving wear-resistant steel ball and fancy grade formula formula, after fineness of pulverized coal is qualified, carry out four hours continuously, the service data of test period pulverized coal preparation system sees attached list 3.
Through data processing, the average output of #6 boiler D coal pulverizer is 44.2t/h, the unit power consumption of coal pulverizing of coal pulverizer is 14.56kW.h/t, the unit power consumption of coal pulverizing of mill exhauster is 7.97kW.h/t, under the energy-conservation steel ball of novel high chromium and fancy grade formula formula, the unit power consumption of coal pulverizing of #6 boiler D pulverized coal preparation system is 22.53kW.h/t, and the coal analysis of duration of test and fineness of pulverized coal are in table 12.
Pulverized coal preparation system nominal output test period ature of coal and coal dust situation under table 12 Novel steel ball and fancy grade formula formula
| Analysis project | Symbol | Unit | Analysis result |
| Particle diameter | mm | 0～30mm | |
| Total moisture | Mt | ％ | 9.0 |
| Air-dried moisture | Mad | ％ | 1.12 |
| As-received ash content | Aar | ％ | 32.80 |
| Dry ash free basis volatile matter | Vdaf | % | 33.87 |
| Air-dried basis sulphur content | St,ad | ％ | 1.82 |
| As-received low heat valve | Ｑnet.v.ar | MJ/kg | 17.95 |
| Ha Shi can grind index | HGI | 74 | |
| Fineness of pulverized coal | R90 | % | 21.7 |
| Fineness of pulverized coal | R200 | % | 3.1 |
Pulverized coal preparation system EIAJ test result under 7.5 Novel steel balls and fancy grade formula formula
Add and install steel ball dress additional to make steel ball carrying capacity be 35 tons at #6 boiler D coal pulverizer, steel ball matching adopts the grating mode after optimizing, pulverized coal preparation system ventilation remains on carries out pulverized coal preparation system nominal output test under superelevation chromium energy-saving wear-resistant steel ball and fancy grade formula formula under the operating mode of Maximum Ventilatory Volume, after fineness of pulverized coal is qualified, carry out two hours continuously, the service data of test period pulverized coal preparation system sees attached list 4.
Duration of test, the average output of #6 boiler D coal pulverizer is 49.4t/h, the unit power consumption of coal pulverizing of coal pulverizer is 13.26kW.h/t, the unit power consumption of coal pulverizing of mill exhauster is 9.86kW.h/t, under the energy-conservation steel ball of novel high chromium and fancy grade formula formula, in the time of pulverized coal preparation system EIAJ operating mode, the unit power consumption of coal pulverizing of #6 boiler D pulverized coal preparation system is 23.12kW.h/t, and the coal analysis of duration of test and fineness of pulverized coal are in table 13.
Pulverized coal preparation system EIAJ test period ature of coal and coal dust situation under table 13 Novel steel ball and fancy grade formula formula
| Analysis project | Symbol | Unit | Analysis result |
| Particle diameter | mm | 0～30mm | |
| Total moisture | Mt | ％ | 8.9 |
| Air-dried moisture | Mad | ％ | 2.14 |
| Analysis project | Symbol | Unit | Analysis result |
| As-received ash content | Aar | ％ | 27.97 |
| Dry ash free basis volatile matter | Vdaf | % | 35.96 |
| Air-dried basis sulphur content | St,ad | ％ | 1.57 |
| As-received low heat valve | Ｑnet.v.ar | MJ/kg | 19.58 |
| Ha Shi can grind index | HGI | 71 | |
| Fineness of pulverized coal | R90 | % | 22.4 |
| Fineness of pulverized coal | R200 | % | 3.8 |
The ball consumption measuring and calculating of 7.6 Novel steel balls
Move 1588 hours in #6 boiler D coal pulverizer accumulative total, feeder accumulative total coal-supplying amount is 70201t, initial ball load is 31.3t, ball load 3.7t again, recyclable ball amount is 30.9t, the ball of novel superelevation chromium abrasion-proof steel ball consumption 58.4g/t enters stove ature of coal excursion as table 14 within the measuring and calculating period of D coal pulverizer as calculated.
Ature of coal excursion during the measuring and calculating of table 14 Novel steel ball ball consumption;
| Analysis project | Symbol | Unit | Analysis result |
| Particle diameter | mm | 0～30mm | |
| Total moisture | Mt | ％ | 8.0-9.0 |
| Air-dried moisture | Mad | ％ | 1.1-2.2 |
| As-received ash content | Aar | ％ | 25-33 |
| Dry ash free basis volatile matter | Vdaf | % | 32-36 |
| Air-dried basis sulphur content | St,ad | ％ | 1.4-1.8 |
| As-received low heat valve | Ｑnet.v.ar | MJ/kg | 18-21 |
| Ha Shi can grind index | HGI | 70-80 | |
| Fineness of pulverized coal | R90 | % | 21.0-23.1 |
| Fineness of pulverized coal | R200 | % | 3.0-4.2 |
8 conclusion (of pressure testing)s
By test, can draw to draw a conclusion.
1) under common high chrome ball and conventional stage formula formula, #6 boiler D pulverized coal preparation system nominal output is 43.7t/h, and the unit power consumption of coal pulverizing of coal pulverizer is 20.57kW.h/t, and the unit power consumption of coal pulverizing of D pulverized coal preparation system is 28.91kW.h/t.
2) under common high chrome ball and conventional stage formula formula, #6 boiler D pulverized coal preparation system EIAJ is 48.9t/h, and the unit power consumption of coal pulverizing of coal pulverizer is 19.12kW.h/t, and the unit power consumption of coal pulverizing of D pulverized coal preparation system is 29.49kW.h/t.
3) under novel superelevation chromium energy-saving wear-resistant steel ball and fancy grade formula formula, #6 boiler D pulverized coal preparation system nominal output is 44.2t/h, and the unit power consumption of coal pulverizing of coal pulverizer is 14.56kW.h/t, and the unit power consumption of coal pulverizing of D pulverized coal preparation system is 22.53kW.h/t.
4) under novel superelevation chromium energy-saving wear-resistant steel ball and fancy grade formula formula, #6 boiler D pulverized coal preparation system EIAJ is 49.2t/h, and the unit power consumption of coal pulverizing of coal pulverizer is 13.26kW.h/t, and the unit power consumption of coal pulverizing of D pulverized coal preparation system is 23.12kW.h/t.
5) ball of novel superelevation chromium energy-saving wear-resistant steel ball consumption is 58.4g/t.Subordinate list 1D pulverized coal preparation system service data (nominal output under plain ball and traditional grating)
| Sequence number | Project | Unit | Numerical value |
| 1 | D mill exhauster inlet baffle aperture | % | 64.5 |
| 2 | D mill exhauster recirculation baffle opening | % | 6.8 |
| 3 | D mill exhauster outlet pressure | kPa | 3.97 |
| 4 | D mill exhauster inlet pressure | kPa | -8.1 |
| 5 | The weary tolerance of D mill exhauster entrance | m3/h | 92364 |
| 6 | D mill exhauster outlet temperature | ℃ | 76.2 |
| 7 | D mill exhauster entrance cold-air flap aperture | % | 45 |
| 8 | D mill exhauster electric current | A | 46.2 |
| 9 | D coal pulverizer electric current | A | 106.3 |
| 10 | D coal pulverizer outlet temperature | ℃ | 67.6 |
| 11 | D coal pulverizer differential pressure | kPa | 1.77 |
| 12 | D is grinding into a mouthful cold-air flap aperture | % | 22 |
| 13 | D is grinding into a mouthful hot air disperser aperture | % | 55 |
| 14 | D is grinding into a mouthful mixing wind-warm syndrome | ℃ | 187.3 |
| 15 | D mill fore bearing temperature 1 | ℃ | 34.3 |
| 16 | D mill fore bearing temperature 2 | ℃ | 33.7 |
| Sequence number | Project | Unit | Numerical value |
| 17 | D mill rear bearing temperature 1 | ℃ | 32.5 |
| 18 | D mill rear bearing temperature 2 | ℃ | 32.8 |
| 19 | D mill exhauster fore bearing temperature | ℃ | 53.4 |
| 20 | D mill exhauster rear bearing temperature | ℃ | 42.1 |
Subordinate list 2D pulverized coal preparation system service data (EIAJ under plain ball and traditional grating)
| Sequence number | Project | Unit | Numerical value |
| 1 | D mill exhauster inlet baffle aperture | % | 88.9 |
| 2 | D mill exhauster recirculation baffle opening | % | 20.3 |
| 3 | D mill exhauster outlet pressure | kPa | 4.22 |
| 4 | D mill exhauster inlet pressure | kPa | -10.1 |
| 5 | The weary tolerance of D mill exhauster entrance | m3/h | 123201 |
| 6 | D mill exhauster outlet temperature | ℃ | 77.1 |
| 7 | D mill exhauster entrance cold-air flap aperture | % | 56 |
| 8 | D mill exhauster electric current | A | 59.8 |
| 9 | D coal pulverizer electric current | A | 111.7 |
| 10 | D coal pulverizer outlet temperature | ℃ | 66.3 |
| 11 | D coal pulverizer differential pressure | kPa | 1.94 |
| 12 | D is grinding into a mouthful cold-air flap aperture | % | 34 |
| 13 | D is grinding into a mouthful hot air disperser aperture | % | 65 |
| 14 | D is grinding into a mouthful mixing wind-warm syndrome | ℃ | 189.9 |
| 15 | D mill fore bearing temperature 1 | ℃ | 33.4 |
| 16 | D mill fore bearing temperature 2 | ℃ | 36.9 |
| 17 | D mill rear bearing temperature 1 | ℃ | 31.8 |
| 18 | D mill rear bearing temperature 2 | ℃ | 32.9 |
| 19 | D mill exhauster fore bearing temperature | ℃ | 54.9 |
| 20 | D mill exhauster rear bearing temperature | ℃ | 43.1 |
Subordinate list 3D pulverized coal preparation system service data (nominal output under Novel steel ball and optimum grating)
| Sequence number | Project | Unit | Numerical value |
| 1 | D mill exhauster inlet baffle aperture | % | 54.6 |
| 2 | D mill exhauster recirculation baffle opening | % | 10 |
| 3 | D mill exhauster outlet pressure | kPa | 4.03 |
| 4 | D mill exhauster inlet pressure | kPa | -7.9 |
| 5 | The weary tolerance of D mill exhauster entrance | m3/h | 90885 |
| 6 | D mill exhauster outlet temperature | ℃ | 74.2 |
| 7 | D mill exhauster entrance cold-air flap aperture | % | 38 |
| 8 | D mill exhauster electric current | A | 44.1 |
| 9 | D coal pulverizer electric current | A | 78.6 |
| 10 | D coal pulverizer outlet temperature | ℃ | 68.1 |
| 11 | D coal pulverizer differential pressure | kPa | 1.62 |
| 12 | D is grinding into a mouthful cold-air flap aperture | % | 23 |
| 13 | D is grinding into a mouthful hot air disperser aperture | % | 58 |
| 14 | D is grinding into a mouthful mixing wind-warm syndrome | ℃ | 182.9 |
| 15 | D mill fore bearing temperature 1 | ℃ | 31.0 |
| 16 | D mill fore bearing temperature 2 | ℃ | 28.9 |
| 17 | D mill rear bearing temperature 1 | ℃ | 31.9 |
| 18 | D mill rear bearing temperature 2 | ℃ | 34.2 |
| 19 | D mill exhauster fore bearing temperature | ℃ | 51.2 |
| 20 | D mill exhauster rear bearing temperature | ℃ | 45.0 |
Subordinate list 4D pulverized coal preparation system service data (EIAJ under Novel steel ball and optimum grating)
| Sequence number | Project | Unit | Numerical value |
| 1 | D mill exhauster inlet baffle aperture | % | 82.3 |
| 2 | D mill exhauster recirculation baffle opening | % | 18.2 |
| 3 | D mill exhauster outlet pressure | kPa | 4.13 |
| 4 | D mill exhauster inlet pressure | kPa | -9.5 |
| Sequence number | Project | Unit | Numerical value |
| 5 | The weary tolerance of D mill exhauster entrance | m3/h | 114201 |
| 6 | D mill exhauster outlet temperature | ℃ | 78.2 |
| 7 | D mill exhauster entrance cold-air flap aperture | % | 51 |
| 8 | D mill exhauster electric current | A | 57.3 |
| 9 | D coal pulverizer electric current | A | 81.9 |
| 10 | D coal pulverizer outlet temperature | ℃ | 68.7 |
| 11 | D coal pulverizer differential pressure | kPa | 1.91 |
| 12 | D is grinding into a mouthful cold-air flap aperture | % | 30 |
| 13 | D is grinding into a mouthful hot air disperser aperture | % | 66 |
| 14 | D is grinding into a mouthful mixing wind-warm syndrome | ℃ | 185.2 |
| 15 | D mill fore bearing temperature 1 | ℃ | 34.2 |
| 16 | D mill fore bearing temperature 2 | ℃ | 37.1 |
| 17 | D mill rear bearing temperature 1 | ℃ | 34.8 |
| 18 | D mill rear bearing temperature 2 | ℃ | 37.2 |
| 19 | D mill exhauster fore bearing temperature | ℃ | 54.9 |
| 20 | D mill exhauster rear bearing temperature | ℃ | 45.2 |
It should be noted that, the utility model illustrated embodiment, just in order more clearly to express the utility model, is not limited to the utility model.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.Every foundation technical spirit of the present utility model, to any simple modification made for any of the above embodiments, all still belongs to the scope of technical solutions of the utility model.
Claims (13)
1. a low speed coal mill, comprise cylindrical shell (4), motor (8), reductor (7), cylindrical shell (4) is supported by bearing (2), it is characterized in that: in cylindrical shell (4), being filled with diameter is the steel ball between Φ 20-Φ 90, on one end of cylindrical shell (4), cover has driven wheel, described motor (8) rotates by being connected to cylindrical shell (4) described in the driving gear drives on described reductor (7), slow biography device (9) is installed on described driven wheel, on the inwall of cylindrical shell (4), is covered with waveform liner plate in axial direction.
2. low speed coal mill as claimed in claim 1, is characterized in that: described bearing (2) is by the bearing support block fixed support at its two ends.
3. low speed coal mill as claimed in claim 2, is characterized in that: described bearing support block is fixedly mounted on the platen (5) of its underpart.
4. the low speed coal mill as described in any one in claim 1, is characterized in that: one end of described cylindrical shell (4) is fixedly connected with import hopper (6), and the other end is fixedly connected with outlet hopper (1).
5. low speed coal mill as claimed in claim 4, is characterized in that: import hopper (6) is fixed by described bearing support block and is connected with cylindrical shell (4) conducting with outlet hopper (1).
6. low speed coal mill as claimed in claim 1, is characterized in that: the quantity of described motor (8) is one.
7. low speed coal mill as claimed in claim 1, is characterized in that: the quantity of motor (8) is two and both sides in described cylindrical shell (4) one end respectively.
8. low speed coal mill as claimed in claim 1, is characterized in that: motor (8) is direct current generator or alternating current generator.
9. low speed coal mill as claimed in claim 1, is characterized in that: cylinder (4) body is segmented overall structure.
10. low speed coal mill as claimed in claim 1, is characterized in that: in described cylindrical shell outer circumferential walls, be covered with blimp.
11. low speed coal mills as claimed in claim 1, is characterized in that: the surface of described liner plate scribbles high-abrasive material tungsten carbide.
12. low speed coal mills as described in claim 1 or 11, is characterized in that: between described liner plate and liner plate, form groove.
13. low speed coal mills as claimed in claim 12, is characterized in that: the deep equality between described groove and groove.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437763A (en) * | 2014-09-24 | 2015-03-25 | 青岛楚天节能技术有限公司 | Grading method of coal mill steel balls and application thereof |
| CN104475196A (en) * | 2014-11-25 | 2015-04-01 | 广西鱼峰水泥股份有限公司 | Mill capable of improving mixing amount of road cement mineral powder |
| CN109569803A (en) * | 2017-09-28 | 2019-04-05 | 新昌县扬中磨具有限公司 | A kind of ball mill |
| CN109569810A (en) * | 2017-09-28 | 2019-04-05 | 新昌县扬中磨具有限公司 | A kind of ball mill easy to process |
| CN110560223A (en) * | 2019-09-10 | 2019-12-13 | 武钢集团昆明钢铁股份有限公司 | Method for detecting ball mill output |
| CN116393218A (en) * | 2023-03-09 | 2023-07-07 | 华能曲阜热电有限公司 | Monitoring system and method for ball consumption of steel balls of coal mill |
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2013
- 2013-08-30 CN CN201320537739.7U patent/CN203750614U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437763A (en) * | 2014-09-24 | 2015-03-25 | 青岛楚天节能技术有限公司 | Grading method of coal mill steel balls and application thereof |
| CN104475196A (en) * | 2014-11-25 | 2015-04-01 | 广西鱼峰水泥股份有限公司 | Mill capable of improving mixing amount of road cement mineral powder |
| CN109569803A (en) * | 2017-09-28 | 2019-04-05 | 新昌县扬中磨具有限公司 | A kind of ball mill |
| CN109569810A (en) * | 2017-09-28 | 2019-04-05 | 新昌县扬中磨具有限公司 | A kind of ball mill easy to process |
| CN110560223A (en) * | 2019-09-10 | 2019-12-13 | 武钢集团昆明钢铁股份有限公司 | Method for detecting ball mill output |
| CN116393218A (en) * | 2023-03-09 | 2023-07-07 | 华能曲阜热电有限公司 | Monitoring system and method for ball consumption of steel balls of coal mill |
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