CN113717765B - Sintering fuel granulating system and particle size online detection and control method thereof - Google Patents
Sintering fuel granulating system and particle size online detection and control method thereof Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 102
- 238000001514 detection method Methods 0.000 title claims abstract description 100
- 238000005245 sintering Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002245 particle Substances 0.000 title claims description 76
- 238000012216 screening Methods 0.000 claims abstract description 40
- 239000010985 leather Substances 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 20
- 238000004140 cleaning Methods 0.000 claims description 16
- 230000033228 biological regulation Effects 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims 1
- 235000020985 whole grains Nutrition 0.000 abstract description 6
- 239000008187 granular material Substances 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
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- 239000002028 Biomass Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
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- 230000002411 adverse Effects 0.000 description 1
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- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
- C10L5/363—Pellets or granulates
-
- 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
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/42—Solid fuels essentially based on materials of non-mineral origin on animal substances or products obtained therefrom, e.g. manure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/28—Cutting, disintegrating, shredding or grinding
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/546—Sieving for separating fractions, components or impurities during preparation or upgrading of a fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention discloses a whole grain system of sintering fuel, which comprises a primary screening device, a coarse crushing device, a secondary screening device, a fine crushing device and a detection and control device which are sequentially arranged, wherein the primary screening device and the secondary screening device are used for carrying out combined conveying on sintering fuel sieved by the primary screening device and the secondary screening device through a first finished product conveying belt; the fine crushing device conveys the fine crushed sintering fuel through a second finished product conveying belt; the detection and control device comprises a first granularity detection device and a second granularity detection device which are respectively used for detecting the granularity of the first finished product conveying leather and the granularity of the second finished product conveying leather on line, and the detection and control devices are correspondingly controlled by a computer control system according to the detection result. The invention also discloses an online detection and control method of the whole granule system. Through respectively detecting the screened finished product and the fine broken finished product, the over-crushing of the bulk fuel can be effectively avoided while the content of the fuel is accurately controlled to be less than 3mm, so that the content of the size fraction of less than 0.5mm, particularly the content of the size fraction of less than 0.25mm, the utilization efficiency of the fuel is improved, and the fuel consumption and the environmental pollution are reduced.
Description
Technical Field
The invention relates to a sintered fuel detection technology, in particular to a sintered fuel granule finishing system and a particle size online detection and control method thereof.
Background
The addition amount, the particle size distribution and the combustion characteristics of the sintering fuel directly influence the temperature distribution, the air permeability and the atmosphere of a sintering material layer, thereby influencing the quality index of sintering products. When the type and the addition amount of the sintering fuel are fixed, the particle size distribution of the fuel plays a very key role in the sintering and ore forming process. A large number of studies have shown that the fuel particle size should not be too large or too small. Excessive fuel particle size will have a number of adverse effects: 1) the combustion zone becomes wider, the sintering permeability becomes worse, the vertical sintering speed is reduced, and the utilization coefficient is reduced; 2) the fuel is distributed unevenly, and the large particles are over-melted around the fuel, so that the far part cannot be fully sintered; 3) segregation is easy to occur, large particles are concentrated at the lower part of the material layer, so that the temperature difference between the upper part and the lower part of the sintered material layer is increased, the lower material is over-melted, and the strength of the upper sintered ore is poor. If the fuel particle size is too small, the fuel is easily taken away by air flow on one hand and cannot be effectively utilized; on the other hand, the combustion speed is too high, the periphery of the fuel particles cannot be kept at a certain high temperature for a certain time, the formation of a liquid phase is not facilitated, and the yield is reduced. In addition, the change of the grain size composition of the sintering fuel can affect the recrystallization of oxides, the reduction and decomposition of high oxides, the generation amount of liquid phase, the mineral composition of the sintering ore, the macro-structure and the microstructure of the sintering ore and the like, particularly the generation of calcium ferrite in the sintering ore, and can directly affect the metallurgical properties of the sintering ore, such as the reducibility and the like. Therefore, a method for effectively controlling the particle size of the sintering fuel is needed, so that the particle size of the fuel meets the requirement of sintering production, and the particle size of the fuel is prevented from being too large or too small.
At present, the traditional sintered fuel detection method is to manually sample from a crushed fuel conveying belt, perform offline screening, weighing and statistics to obtain the particle size data of the fuel, so as to guide adjustment of the distance between crushers and control the crushing particle size of the fuel. The method has the disadvantages of high labor intensity, long detection time and serious hysteresis, and cannot realize the functions of informatization and automatic detection control. In order to solve the problems of the conventional method, chinese patent CN103364315B discloses an on-line detection method and a detection device for particle size of sintered solid fuel, wherein the detection method comprises the following steps: flattening and flattening the solid fuel, acquiring image data of granularity, extracting the image data of the granularity, preprocessing the image data of the granularity, segmenting the image of the granularity, extracting the image characteristic of the granularity, and counting and analyzing the image characteristic of the granularity. It is desirable to detect the particle size distribution density of the solid fuel by performing image processing, feature extraction, and analysis calculation by a computer. Chinese patent CN109470609A discloses a material granularity on-line detector and a detection method thereof. The material granularity on-line detector comprises a feeding hopper, a shell, a gas discharge pipe, a discharge collecting hopper and a camera.
Although the above patent can realize the on-line detection of the sintering fuel granularity to a certain extent, the existing image recognition method causes the change of the natural stacking state of the materials due to the flattening and flattening of the solid fuel, the detected granularity can not well reflect the real situation of the fuel granularity, and the problem of low detection precision exists. The method disclosed by the patent CN109470609A has the problems of complex equipment, poor operation reliability and the like, and is easy to cause dust pollution because the method adopts gas to blow and float materials. In addition, in the prior art, when the fuel granularity is abnormal, the abnormal process ring nodes cannot be found in time, and the process links which may cause the abnormal process ring nodes still need to be manually checked one by one for a long time. In summary, none of the prior art methods relate to how to further optimize and effectively control the fuel particle size by using the fuel particle size obtained by online detection, and cannot realize closed-loop automatic control of the sintered fuel particle size and ensure that the fuel particle size constantly meets different production condition requirements.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a whole grain system of a sintering fuel and an online particle size detection and control method thereof, which can simultaneously realize online real-time high-precision detection of the particle size of the sintering fuel and closed-loop automatic control of the particle size of the fuel, and ensure that the particle size of the fuel meets the requirements of different sintering production conditions at any time, thereby improving the quality index of the sintering mineral products, reducing the fuel consumption and reducing the environmental pollution.
On one hand, the whole granule system of the sintering fuel comprises a primary screening device, a coarse crushing device, a secondary screening device, a fine crushing device and a detection and control device which are sequentially arranged, wherein the primary screening device and the secondary screening device combine and convey the sintering fuel screened by the primary screening device and the secondary screening device as finished products through a first finished product conveying belt; the fine crushing device conveys the fine crushed sintering fuel through a second finished product conveying belt; the detection and control device comprises a first granularity detection device and a second granularity detection device which are respectively used for detecting the granularity of the first finished product and the second finished product on the conveying leather on line, a computer control system connected with the first granularity detection device and the second granularity detection device, a central control alarm system connected with the computer control system, an automatic screen cleaning system and an interval control system of the coarse crushing device and the fine crushing device, wherein the computer control system controls the central control alarm system to alarm or controls the automatic screen cleaning system to clean the screen according to the detection signal of the first granularity detection device, and controls the interval control system of the coarse crushing device and the fine crushing device to adjust the interval according to the detection signal of the second granularity detection device.
The first and second particle size detection devices comprise a plurality of sets of high-definition cameras which are arranged above the respective finished product conveying belts and are arranged at intervals along the cross section direction of the belts, and are used for detecting and analyzing particle size composition of the fuel in a natural accumulation state.
The screen hole size ranges of the primary screening device and the secondary screening device are respectively 4-8mm and 3-6 mm.
The coarse crushing device is a double-roll crusher or a reaction crusher, and the distance regulation range is 8-15 mm.
The fine crushing device is a four-roller crusher, and the distance regulation range of the fine crushing device is 3-5 mm.
The sintering fuel is one or a mixture of more of coke, anthracite, semi-coke or biomass fuel.
On the other hand, the particle size on-line detection and control method of the sintering fuel particle size regulation system is characterized in that a sintering fuel particle regulation process is designed into four steps of primary screening, coarse crushing, secondary screening and fine crushing, sintering fuels which are respectively screened for the first time and the second time and are used as finished products are combined into a first path to be conveyed, the sintering fuels which are subjected to the fine crushing are conveyed as a second path, the on-line particle size detection is respectively carried out on the sintering fuels conveyed in the two paths through a first particle size detection device and a second particle size detection device, and corresponding alarming, cleaning and distance adjustment and control are carried out through a computer control system according to detection signals.
The method for detecting and controlling the online granularity of the first path by the first granularity detection device comprises the following steps:
a. acquiring granularity composition data of the sintering fuel at a set frequency through a first granularity detection device, and sending the data to a computer control system;
b. Calculating a moving average value of corresponding grain fraction content according to received grain composition data by a computer control system in a set period, and recording the moving average value as PS;
c. the PS is compared by the computer control system with the set desired upper PS1 and lower PS2 limits: if PS is greater than PS1, sending a control signal for replacing the screen to a central control alarm system; if PS < PS2, a control signal to the automatic screen cleaning system to clean the screen is sent.
The on-line granularity detection and control method of the second path by the second granularity detection device comprises the following steps:
d. acquiring grain size composition data of the sintering fuel at a set frequency through a second grain size detection device, and sending the data to a computer control system;
e. calculating the average particle size and the moving average value of the corresponding particle size content in a set period by the computer control system according to the received particle size composition data, and respectively recording the average particle size and the moving average value as MS and CS;
f. comparing the MS and the CS with the set ideal value upper limits MS1 and CS1 and the set ideal value lower limits MS2 and CS2 respectively through a computer control system, and controlling according to the comparison result as follows:
f1. if MS is MS1 and CS is CS1, simultaneously sending the distance reduction control signal to the distance control system of the coarse breaking device and the fine breaking device;
f2. if MS is more than MS1, and CS2 is not less than CS1, sending the spacing reduction control signal to a coarse crushing device spacing control system;
f3. If the MS is not less than MS2 and not more than MS1 and the CS is more than CS1, sending a spacing reduction control signal to a fine breaking device spacing control system;
f4. if MS < MS2 and CS < CS2, simultaneously sending a spacing increase control signal to a coarse breaking device spacing control system and a fine breaking device spacing control system;
f5. if MS is more than MS2 and CS is more than or equal to CS2 and less than or equal to CS1, sending a spacing increase control signal to a coarse crushing device spacing control system;
f6. if the MS is not less than MS2 and not more than MS1 and the CS is less than CS2, sending a spacing increase control signal to a fine breaking device spacing control system;
f7. if MS is more than MS1 and CS is less than CS2, the distance reduction control signal is sent to the distance control system of the coarse breaking device, and the distance increase control signal is sent to the distance control system of the fine breaking device;
f8. and if MS < MS2, CS > CS1, sending a spacing increase control signal to the coarse breaking device spacing control system and sending a spacing decrease control signal to the fine breaking device spacing control system.
The set frequency in the step a is 10 seconds/time; in the step b, the moving average value of the content of the 3-5mm size fraction is calculated by taking 5-10 minutes as a period.
The set frequency in the step d is 5 seconds/time; in the step b, the average particle size and the moving average value of the content of the 2-4mm particle size fraction are calculated by taking 3-5 minutes as a period.
The pitch reduction control signal in steps f1-f3 is a reduction of 3%; the pitch increase control signal in steps f4-f6 is an increase of 3%; the pitch reduction control signal in said steps f7-f8 is a 2% reduction and the pitch increase control signal is a 2% increase.
The whole grain system of the sintering fuel and the online granularity detection and control method thereof have the following beneficial effects:
1. compared with the prior art, the method has the advantages that one-time screening is added, and the sintered fuel obtained by twice screening and final fine crushing is respectively conveyed as two paths of finished products;
2. the sintering fuel as a finished product is divided into two paths for on-line granularity detection and control, so that the separation control of screen cleaning/replacement and coarse and fine crushing device interval adjustment is realized, the problem link causing the abnormal granularity of the fuel can be more accurately and timely found, corresponding improvement measures are automatically taken, the negative influence of the granularity fluctuation of the fuel on the sintering process is reduced, and the quality index of the sintered mineral product is favorably improved;
3. because the sintering fuel granulating process of 'primary screening + coarse crushing + secondary screening + fine crushing' is adopted, and the granularity of two paths of fuel is detected and controlled on line at the same time, the over-crushing of the fuel can be effectively avoided while the content of the fuel is controlled to be less than 3mm, so that the size fraction of less than 0.5mm, particularly the content of less than 0.25mm, the utilization efficiency of the fuel is improved, and the fuel consumption and the environmental pollution are reduced.
4. Because the fuel that will be located the conveyor belt is divided into a plurality of regions along the cross section direction to install one set of high definition camera directly over each region respectively, can avoid destroying the fuel natural stacking state, realized the high accuracy on-line measuring of fuel granularity.
5. Because the second-path fuel granularity on-line detection and control method adopts the two-condition control of the average granularity moving average MS and the 2-4mm granularity content moving average CS, the fine automatic regulation and control of the coarse and fine crushing device interval adjustment are realized, the regulation and control time is shortened, and the regulation and control efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a system for straightening pellets of a sintering fuel according to the present invention.
FIG. 2 is a schematic diagram of the layout of the first or second particle size detecting apparatus according to the present invention.
Fig. 3 is a flow chart of the first path online granularity detection and control method of the present invention.
Fig. 4 is a flow chart of a second path online granularity detection and control method according to the present invention.
Detailed Description
The whole grain system of a sintering fuel and the online detection and control method of the grain size thereof according to the present invention are further described with reference to the accompanying drawings and examples.
The pelletizing system of the sintered fuel of the present invention is shown in fig. 1: the device comprises a primary screening device, a coarse crushing device, a secondary screening device, a fine crushing device and a detection and control device which are sequentially arranged. Wherein, the size of the sieve pore of the primary screening device is 4-8mm, in this embodiment, 4cm, and the size of the sieve pore of the secondary screening device is 3-6mm, and in this embodiment, 3 mm; sintering fuel with the screen size of <4mm and <3mm under the primary screening device and the secondary screening device respectively is used as a finished product and is conveyed to a sintering fuel tank through a first finished product conveying belt in a combined mode, and the first path is marked as a path A in the figure 1; the fine crushing device conveys the fine crushed sintering fuel to a sintering fuel tank through a second finished product conveying belt, and the second path is marked as a path B in the figure 1; the detection and control device comprises a first granularity detection device and a second granularity detection device which are respectively used for detecting the granularity of the first finished product conveying leather and the granularity of the second finished product conveying leather on line, a computer control system connected with the first granularity detection device and the second granularity detection device, a central control alarm system connected with the computer control system, an automatic screen mesh cleaning system and an interval control system of the coarse crushing device and the fine crushing device, wherein the computer control system controls the central control alarm system to give an alarm or controls the automatic screen mesh cleaning system to clean the screen mesh according to a detection signal of the first granularity detection device, and controls the interval control system of the coarse crushing device and the interval control system of the fine crushing device to adjust the intervals according to a detection signal of the second granularity detection device.
As shown in fig. 2, in order to detect and analyze the particle size composition of the fuel in the natural accumulation state, the cross section of the belt may be artificially divided into a plurality of regions for respective detection, and therefore, each of the first and second particle size detection devices includes a plurality of sets of high-definition cameras disposed above the respective finished product conveyor belt and spaced apart from each other along the cross section of the belt, so as to respectively detect the particle sizes of the corresponding regions. Generally, at least two sets are needed, and usually three sets are needed to meet the requirement, and the more sets are set, the more accurate the detection value is. As shown in fig. 2, the cross section of a belt 5 is divided into three areas i, ii and iii, a high-definition camera 3 is respectively arranged above the three areas to perform all-around image acquisition on the sintered fuel 4 in a natural accumulation state in the three areas according to a set frequency, the acquired image information is transmitted to a particle size detection control unit 1, and the particle size detection control unit 1 performs processing, feature extraction and analysis calculation on the acquired image information and outputs fuel particle size composition information to a computer control system 2. The technology can adopt the existing image processing technology, is not the invention point of the invention, and is not described in detail herein.
The coarse crushing device can adopt a double-roll crusher or a reaction crusher, and the distance regulation range is 8-15 mm; the fine crushing device can adopt a four-roller crusher, and the distance regulation range is 3-5 mm.
The sintering fuel suitable for the whole grain system of the invention can be one or a mixture of more of coke, anthracite, semi-coke or biomass fuel.
The online particle size detection and control method of the whole granule system comprises the following specific steps:
the sintering fuel granulating process is designed into four steps of primary screening, coarse screening, secondary screening and fine screening, the sintering fuel which is respectively screened for the primary screening and the secondary screening and is used as a finished product is combined into a first path (namely, path A in figure 1), the sintering fuel which is subjected to the fine screening and is used as a second path (namely, path B in figure 1), the sintering fuel which is conveyed in the two paths is respectively subjected to online granularity detection through a first granularity detection device and a second granularity detection device, and corresponding alarming, cleaning and interval regulation control are carried out through a computer control system according to detection signals.
Referring to fig. 3, the method for detecting and controlling the online granularity of the first path by the first granularity detection apparatus specifically includes the following steps:
a. the method comprises the following steps of collecting grain size composition data of sintering fuel at a set frequency such as 10 seconds/time and the like through a first grain size detection device, and sending the data to a computer control system;
b. calculating the moving average value of the content of the corresponding size fraction (such as 3-5 mm) by a computer control system according to the received particle composition data in a set period such as 5-10 minutes and the like, and recording the moving average value as PS; a moving average of the level contents is calculated periodically.
c. Comparing, by the computer control system, the PS with the set desired upper PS1 and lower PS2 limits: if PS is greater than PS1, sending a control signal for replacing the screen to the central control alarm system by the computer control system, and reminding an operator to replace the screen in time; if PS < PS2, transmitting a control signal for cleaning the screen to an automatic screen cleaning system by the computer control system, thereby cleaning the screen in time; if PS2 is not less than PS1, the PS value comparison is completed.
Referring to fig. 4, the method for detecting and controlling the online granularity of the second path by the second granularity detection apparatus specifically includes the following steps:
d. acquiring grain size composition data of the sintering fuel by a second grain size detection device at a set frequency such as 5 seconds/time and the like, and sending the grain size composition data to a computer control system;
e. calculating the average particle size and the moving average value of the content of corresponding particle size fraction (2-4mm and the like) by a computer control system according to the received particle size composition data in a set period such as 3-5 minutes and the like, and respectively recording the average particle size and the moving average value as MS and CS;
f. comparing the MS and the CS with the set ideal value upper limits MS1 and CS1 and the set ideal value lower limits MS2 and CS2 respectively through a computer control system, and controlling according to the comparison result as follows:
f1. if MS is MS1 and CS is CS1, simultaneously sending the distance reduction control signal to the distance control system of the coarse breaking device and the fine breaking device;
f2. If MS is more than MS1, and CS2 is not less than CS is not more than CS1, sending a spacing reduction control signal to a coarse crushing device spacing control system;
f3. if the MS is not less than MS2 and not more than MS1 and the CS is more than CS1, sending a spacing reduction control signal to a fine breaking device spacing control system;
f4. if MS < MS2 and CS < CS2, simultaneously sending a spacing increase control signal to a coarse breaking device spacing control system and a fine breaking device spacing control system;
f5. if MS is more than MS2 and CS is more than or equal to CS2 and less than or equal to CS1, sending a spacing increase control signal to a coarse crushing device spacing control system;
f6. if the MS is not less than MS2 and not more than MS1 and the CS is less than CS2, sending a spacing increase control signal to a fine breaking device spacing control system;
f7. if MS is more than MS1 and CS is less than CS2, the distance reduction control signal is sent to the distance control system of the coarse breaking device, and the distance increase control signal is sent to the distance control system of the fine breaking device;
f8. and if MS < MS2, CS > CS1, sending a spacing increase control signal to the coarse breaking device spacing control system and sending a spacing decrease control signal to the fine breaking device spacing control system.
And if the MS is not less than MS2 and not more than MS1 and the CS is not less than CS2 and not more than CS1, finishing the distance adjusting process of the coarse breaking device and the fine breaking device.
The pitch reduction control signal in steps f1-f3 may be a 3% reduction; the pitch increase control signal in steps f4-f6 may be an increase of 3%; the pitch reduction control signal in the steps f7-f8 may be a reduction of 2% and the pitch increase control signal may be an increase of 2%. Of course, all the parameters can be adjusted correspondingly according to the actual demand situation.
Table 1 example of the invention sets parameters
TABLE 2 results of the experiments
It can be obviously obtained from table 2 that the error between the average particle size of the fuel delivered to the sintering fuel tank and the required value of sintering production can be effectively ensured not to exceed 11% by adopting the whole-grain system and the particle size online detection and control method thereof of the present invention, compared with the comparative example (only the process steps of coarse crushing, sieving and fine crushing are conventionally carried out), the error between the average particle size of the fuel in the sintering batching chamber and the required value of sintering production is reduced by 4-7 percentage points, the content of the fuel in the sintering batching chamber is not less than 70% in a range of <3mm, and the content of the fuel in the sintering batching chamber is not more than 15% in a range of <0.25 mm.
Aiming at the embodiment, the granularity control precision can be improved and the granularity fluctuation can be reduced by further optimizing the granularity detection and control method. For example, when the fuel type is coke, the particle size range of the solid fuel raw material is 0-25mm, the sintering production requirement (average particle size 1.6mm, <3mm content 90%, <0.25mm content 15%), and the initial coarse and fine crushing spacing is 15mm and 3mm respectively, the particle size control accuracy can be further improved by using the detection and control parameters (such as the reduction of the calculation period) shown in table 3:
table 3 example control parameter settings
TABLE 4 results of the experiments
The results of the implementation by further optimization of the monitoring parameters are shown in Table 4, below, in Table 3. Compared with the example 1, the error between the average grain size of the fuel in the sintering batching chambers and the required value of the sintering production of the examples 5 and 6 is further reduced by at least 1-2 percentage points, the lower limit of the content of the fuel in the sintering batching chambers of <3mm is increased, and the content of the fuel in the sintering batching chambers of <0.25mm is obviously reduced.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The particle size online detection and control method of the sintering fuel granulating system comprises a primary screening device, a coarse crushing device, a secondary screening device, a fine crushing device and a detection and control device which are sequentially arranged, wherein the primary screening device and the secondary screening device are used for carrying out combined conveying on sintering fuels sieved respectively as finished products through a first finished product conveying belt; the fine crushing device conveys the fine crushed sintering fuel through a second finished product conveying belt; the detection and control device comprises a first granularity detection device, a second granularity detection device, a computer control system, a central control alarm system, an automatic screen mesh cleaning system and an interval control system of the coarse and fine crushing devices, wherein the first granularity detection device and the second granularity detection device are used for detecting the granularity on the conveying leather of the first finished product and the second finished product respectively, the computer control system is connected with the computer control system respectively, the central control alarm system is controlled by the computer control system to alarm or control the automatic screen mesh cleaning system to clean the screen mesh according to the detection signal of the first granularity detection device, the interval control system of the coarse and fine crushing devices is controlled to perform interval adjustment according to the detection signal of the second granularity detection device, and the interval control system is characterized in that: the sintering fuel granulating process is designed into four steps of primary screening, coarse crushing, secondary screening and fine crushing, sintering fuels which are respectively screened for the first time and the second time and are used as finished products are combined into a first path to be conveyed, the sintering fuels which are subjected to the fine crushing are used as a second path to be conveyed, the first particle size detection device and the second particle size detection device are used for respectively carrying out online particle size detection on the two paths of conveyed sintering fuels, and a computer control system is used for carrying out corresponding alarm, cleaning and interval regulation control according to detection signals;
The method for detecting and controlling the online granularity of the first path by the first granularity detection device comprises the following steps:
a. acquiring particle size composition data of the sintering fuel at a set frequency through a first particle size detection device, and sending the data to a computer control system;
b. calculating a moving average value of corresponding grain fraction content according to received grain composition data by a computer control system in a set period, and recording the moving average value as PS;
c. the PS is compared by the computer control system with the set desired upper PS1 and lower PS2 limits: if PS is greater than PS1, sending a control signal for replacing the screen to a central control alarm system; if PS < PS2, sending a control signal for cleaning the screen to an automatic screen cleaning system;
the second granularity detection device on-line granularity detection and control method for the second path comprises the following steps:
d. collecting the particle size composition data of the sintering fuel at a set frequency through a second particle size detection device, and sending the data to a computer control system;
e. calculating the average particle size and the moving average value of the corresponding particle size content in a set period by the computer control system according to the received particle size composition data, and respectively recording the average particle size and the moving average value as MS and CS;
f. comparing the MS and the CS with the set ideal value upper limits MS1 and CS1 and the set ideal value lower limits MS2 and CS2 respectively through a computer control system, and controlling according to the comparison result as follows:
f1. If MS is more than MS1 and CS is more than CS1, simultaneously sending the distance reduction control signal to the distance control system of the coarse breaking device and the fine breaking device;
f2. if MS is more than MS1, and CS2 is not less than CS1, sending the spacing reduction control signal to a coarse crushing device spacing control system;
f3. if the MS is not less than MS2 and not more than MS1 and the CS is more than CS1, sending a spacing reduction control signal to a fine breaking device spacing control system;
f4. if MS < MS2 and CS < CS2, simultaneously sending a spacing increase control signal to a spacing control system of the coarse breaking device and the fine breaking device;
f5. if MS is more than or equal to MS2 and CS is more than or equal to CS2 and less than or equal to CS1, sending a spacing increase control signal to a coarse crushing device spacing control system;
f6. if the MS is not less than MS2 and not more than MS1 and the CS is less than CS2, sending a spacing increase control signal to a fine breaking device spacing control system;
f7. if MS is more than MS1 and CS is less than CS2, the distance reduction control signal is sent to the distance control system of the coarse breaking device, and the distance increase control signal is sent to the distance control system of the fine breaking device;
f8. and if MS < MS2, CS > CS1, sending a spacing increasing control signal to the coarse breaking device spacing control system and sending a spacing decreasing control signal to the fine breaking device spacing control system.
2. The online particle size detection and control method of claim 1, wherein: the set frequency in the step a is 10 seconds/time; in the step b, the moving average value of the content of the 3-5mm size fraction is calculated by taking 5-10 minutes as a period.
3. The online particle size detection and control method of claim 1, wherein: the set frequency in the step d is 5 seconds/time; in the step b, the average particle size and the moving average value of the content of the 2-4mm particle size fraction are calculated by taking 3-5 minutes as a period.
4. The online particle size detection and control method of claim 3, wherein: the pitch reduction control signal in steps f1-f3 is a reduction of 3%; the pitch increase control signal in steps f4-f6 is an increase of 3%; the pitch reduction control signal in said steps f7-f8 is a 2% reduction and the pitch increase control signal is a 2% increase.
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