CN114623666B - Large-batch lump ore drying and screening system and method thereof - Google Patents
Large-batch lump ore drying and screening system and method thereof Download PDFInfo
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- CN114623666B CN114623666B CN202210305427.7A CN202210305427A CN114623666B CN 114623666 B CN114623666 B CN 114623666B CN 202210305427 A CN202210305427 A CN 202210305427A CN 114623666 B CN114623666 B CN 114623666B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
- B07B1/4636—Regulation of screen apertures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
- F26B25/225—Controlling the drying process in dependence on liquid content of solid materials or objects by repeated or continuous weighing of the material or a sample thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a large-batch lump ore drying and screening system, which comprises a drying system and a screening system, wherein the lump ore drying system comprises a belt, a front weighing chamber, a drying roller and a rear weighing chamber, lump ore enters the front weighing chamber through the belt for weighing, enters the drying roller through a feeding chute port after weighing, a fresh air port and a high-temperature flue gas inlet are arranged at the initial section of the drying roller, the high-temperature flue gas inlet is connected with a combustion chamber, the combustion chamber is connected with an air storage chamber, a flue gas outlet and a discharge chute port are arranged at the end section of the drying roller, the flue gas outlet is connected with a foam dust remover, and the lump ore is communicated with the rear weighing chamber through the discharge chute port; lump ore in the rear weighing chamber is conveyed to the vibrating screen through a belt, a discharge hole is formed in the lower portion of the vibrating screen and leads to a collecting bin, and the upper portion of the vibrating screen is connected with an electrostatic dust collector. The invention also discloses a method for drying and screening the bulk lump ores, which ensures that the moisture content of the lump ores after drying and screening meets the standard requirement and the drying and screening flow is standardized.
Description
Technical Field
The invention relates to the technical field of metal smelting, in particular to a large-batch lump ore drying and screening system and a method thereof.
Background
With the rapid upgrading of modern society construction, the demand for metal products is continuously increased, and in order to improve the quality and quantity of smelted metal products, efficient operation of a metal smelting process is required to be ensured, and the quality of lump ores is crucial to the quality of smelted products. At present, lump ores in the market have large viscosity, high powder content and large moisture content due to long-distance waterway transportation and open-air stacking, and if the lump ores are brought into a blast furnace, the air permeability of the blast furnace can be reduced, the working stability of the blast furnace is affected, and even the environmental quality is endangered. Therefore, how to reduce the viscosity, the powder content and the moisture of lump ores has important practical significance for ensuring the fine management of iron and steel enterprises, improving the quality of blast furnace smelting products and reducing the production cost of the metal smelting industry.
At present, common blast furnace smelting lump ore viscosity, powder content and moisture treatment methods are mainly divided into two types: one is a washing screening method, which is based on a large space field for soaking, washing and screening, and the method requires a large amount of water resources and land resources, and the sludge generated after washing the lump ore needs to be subjected to secondary treatment; the other method is a drying and screening method, which uses high-temperature flue gas to dry lump ores and then screens the lump ores by a screening device, so that the blast furnace materials are finely brought in, but the method uses a large system, and the generated high-temperature flue gas is easy to cause environmental pollution. Therefore, how to design a simple and efficient method suitable for drying and screening massive lump ores on the premise of meeting the requirements of environmental protection, production cost and product quality is a problem to be solved.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problems of high cost, high energy consumption, serious environmental pollution and no drying and screening process specification of mass drying and screening lump ores in the prior art, and aims to provide a mass lump ore drying and screening method which is favorable for finely managing the drying and screening of lump ores, reduces the energy consumption and the environmental pollution generated in the lump ore drying process, ensures that the moisture content of the dried and screened lump ores meets the specification requirements, standardizes the drying and screening process and provides a good thought for the drying and screening technical management of energy-saving, environment-friendly and high-efficiency lump ores.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the bulk lump ore drying and screening system comprises a drying system and a screening system, wherein the lump ore drying system comprises a belt, a front weighing chamber, a drying roller and a rear weighing chamber, lump ore enters the front weighing chamber through the belt for weighing, enters the drying roller through a feeding chute opening after weighing, the drying roller is divided into an initial section, a core section and a final section, the initial section of the drying roller is provided with a fresh air inlet and a high-temperature flue gas inlet, the high-temperature flue gas inlet is connected with a combustion chamber, the combustion chamber is connected with an air storage chamber, the final section of the drying roller is provided with a flue gas outlet and a discharge chute opening, the flue gas outlet is connected with a foam dust remover, and the lump ore is communicated with the rear weighing chamber through the discharge chute opening;
the screening system comprises a vibrating screen, a collecting bin and an electrostatic precipitator, bulk ores in the rear weighing chamber are conveyed to the vibrating screen through a belt, a discharge port is formed in the lower portion of the vibrating screen and leads to the collecting bin, and the upper portion of the vibrating screen is connected with the electrostatic precipitator.
A method for drying and screening bulk lump ores, comprising the following steps:
s1 anticipates: conveying the lump ore raw materials to a front weighing chamber through a belt, and measuring and recording the raw data such as lump ore quality, moisture and the like;
s2, drying: the method comprises the steps of conveying lump ore in a front weighing chamber to a core section of a drying roller by using a belt, calculating a gas air-fuel ratio, then carrying out a No. 1 mixture ratio of mixed gas in a gas storage tank according to the gas air-fuel ratio, then introducing a pipeline into a combustion chamber, introducing high-temperature flue gas generated by combustion in the combustion chamber into an initial section of the drying roller by using the pipeline, arranging a new air port in the initial section of the drying roller to mix the two gases, introducing the No. 2 mixed gas into the core section of the drying roller to carry out lump ore drying, after the drying is finished, treating the flue gas generated in the drying process by using a foam dust remover, discharging the flue gas, conveying the dried lump ore to a rear weighing chamber by using the belt, measuring the moisture of the lump ore, if the drying result meets the requirement that the moisture of the lump ore is less than 2%, conveying the flue gas to a vibrating screen, and calculating the drying efficiency of the lump ore; if the drying result does not meet the requirement that the lump ore moisture is less than 2%, conveying the lump ore to an aggregate pool by using a belt to wait for secondary drying, and adjusting the temperature of a high-temperature flue gas inlet to ensure that the lump ore drying moisture meets the requirement of 2%;
s3, screening: selecting a screening screen opening with the required screening particle size, conveying the screen opening to a six-stage vibrating screen for lump ore screening, enabling screened small particles to fall into a collecting bin, sucking dust generated by vibration into an electrostatic precipitator, enabling ash generated in the dust removing process and the small particles in the collecting bin to be considered as byproducts, conveying the byproducts to the next working procedure by using a belt, enabling lump ores left by the vibrating screen to be considered as products, and finally conveying the products to a blast furnace by using the belt for smelting;
s4, data recording: recording the gas air-fuel ratio required by drying, the high-temperature flue gas and fresh air flow which are introduced into the initial section of the drying roller, the mixed gas No. 2 flow and temperature which are introduced into the core section of the drying roller, the drying efficiency of the lump ore and the moisture of the final lump ore in order to meet the requirement that the moisture of the lump ore is less than 2 percent, and finally forming a corresponding related parameter table of the lump ore under the different moisture;
s5, ending: and (5) drying and screening the lump ores, stopping the operation of equipment, maintaining and cleaning the equipment, and recording a work log.
Further, the gas air-fuel ratio calculation process is as follows: and calculating the calorific value of each kilogram of the measured gas and the theoretical air quantity of the gas in a standard state by using the low calorific value of the gas, and then solving the gas combustion air-fuel ratio according to the range of the air excess coefficient of the complete combustion of the gas between 1.05 and 1.15.
Further, the measures for adjusting the temperature and the flow of the mixed gas introduced into the core section of the drying roller are mainly as follows: on the basis of the primary gas air-fuel ratio, the gas air-fuel ratio is improved, or the flow of the mixed gas No. 1 entering the combustion chamber is improved, or the flow and the temperature of high-temperature flue gas entering the initial section of the drying roller are improved, or the flow of fresh air entering the initial section of the drying roller is reduced, or the flow and the temperature of the mixed gas No. 2 in the core section of the drying roller are improved.
Further, in the step S2 of drying, the secondary drying process is as follows: and (3) adjusting the temperature and flow of the flue gas fed into the core section of the drying roller, directly feeding the lump ore which does not reach the lump ore moisture standard into a front weighing pool from a collecting pool, detecting the moisture, then conveying the lump ore to the drying roller for secondary drying until the lump ore moisture is less than 2%, and stopping the flow.
Further, the drying system is airtight, high-temperature flue gas generated by combustion of the combustion chamber is not directly contacted with the outside, is directly conveyed to the drying roller, and is finally treated by the foam dust remover.
Further, the vibrating screen is in a ladder shape, six stages are provided, the size of a screen opening of the vibrating screen can be adjusted, the vibrating screen is provided with two layers of vibrating screens, the shapes of the upper layer of vibrating screen and the lower layer of vibrating screen are identical, and the two layers of vibrating screens are arranged in a staggered mode.
Further, the mixed gas No. 1 is a mixed gas of gas and air, and the mixed gas No. 2 is a mixed gas of high-temperature flue gas and fresh air.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The invention discards the traditional rough type flue gas of lump ore or utilizes the electric energy to dry and screen, designs a set of method for drying and screening a large number of lump ores, ensures the refinement of lump ores brought into blast furnace smelting, reduces the cost and environmental pollution of the drying and screening of lump ores, and improves the efficiency of the drying and screening of lump ores.
(2) According to the invention, the gas air-fuel ratio is calculated, mixed gas of the gas and the air is proportioned in the gas storage tank, the mixed gas is then introduced into the combustion chamber for combustion, high-temperature flue gas generated by combustion is introduced into the drying roller for drying lump ore, then the moisture content comparison of the lump ore in the front and rear weighing tanks is carried out, the evaporation capacity of the lump ore is solved, whether the moisture content of the dried lump ore meets the requirement is judged, if the moisture content of the lump ore cannot meet the requirement, the lump ore is required to be put into the collecting bin for secondary drying, the flow of the mixed gas in the combustion chamber is changed, the gas air-fuel ratio is improved, or the proportion of the high-temperature flue gas and fresh air introduced into the drying roller is regulated, and if the moisture content of the lump ore meets the requirement, the lump ore screening of the lump ore is carried out, and the drying efficiency of the lump ore batch is obtained. According to the method, on the premise of ensuring the quality of the lump ore drying products, dynamic real-time adjustment of a drying system is realized, the energy consumption generated in the drying process is reduced, and the drying efficiency of the lump ore is improved.
(3) The invention arranges and improves the flue gas treatment system in the lump ore drying process, the flue gas after drying is treated by the foam dust remover, and the exhaust pipe of the foam dust remover is raised, thereby being beneficial to the rapid discharge and dilution of the gas treated by the foam dust remover and reducing the harm to the environment.
(4) According to the invention, the particle diameter screening in the lump ore screening process can be realized by changing the size of the vibrating screen opening, so that the fine operation of lump ore screening is facilitated.
(5) The invention can carry out long-term drying operation with different moisture to form a table of moisture content of a lump ore, and the table of gas air-fuel ratio, high-temperature flue gas and fresh air flow which are fed into the initial section of the drying roller, mixed gas flow and temperature which are fed into the core section of the drying roller, drying efficiency of the drying roller and final lump ore is correspondingly formed, so as to provide a parameter setting reference table for the lump ore drying and screening process.
Drawings
FIG. 1 is a technical roadmap of a method for drying and screening bulk lump ore of the invention;
FIG. 2 is a schematic diagram of an inventive method for drying and screening bulk lump ore;
FIG. 3 is a schematic view of a drying drum;
FIG. 4 is a schematic view of a six-stage vibrating screen;
fig. 5 is a schematic view of a two-layer vibrating screen.
1. A belt; 2. a front weighing chamber; 3. a drying roller; 4. a rear weighing chamber; 5. a foam dust remover; 6. a combustion chamber; 7. a gas storage tank; 8. a vibrating screen; 9. a collecting bin; 10. an electrostatic precipitator; 301. a feed chute; 302. a new wind gap; 303. a high temperature flue gas inlet; 304. a flue gas outlet; 305. and a discharging chute opening.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples:
as shown in fig. 1-5, a bulk lump ore drying and screening system comprises a drying system and a screening system, wherein the lump ore drying system comprises a belt 1, a front weighing chamber 2, a drying roller 3 and a rear weighing chamber 4, lump ore enters the front weighing chamber 2 through the belt 1 to be weighed, and enters the drying roller 3 through a feeding chute opening 301 after being weighed. The drying roller 3 is divided into an initial section, a core section and an end section, the initial section of the drying roller is provided with a fresh air port 302 and a high-temperature flue gas inlet 303, the high-temperature flue gas inlet is connected with a combustion chamber 6, and the combustion chamber is connected with an air storage chamber 7. The end section of the drying drum is provided with a flue gas outlet 304 and a discharge chute opening 305, the flue gas outlet is connected with the foam dust remover 5, and lump ore is led to the rear weighing chamber 4 through the discharge chute opening 305.
The screening system comprises a vibrating screen 8, a collecting bin 9 and an electrostatic precipitator 10, bulk ore in the rear weighing chamber 4 is conveyed to the vibrating screen 8 through a belt 1, a discharge port is arranged at the lower part of the vibrating screen and leads to the collecting bin 9, and the upper part of the vibrating screen 8 is connected with the electrostatic precipitator 10.
The drying system is airtight, and high-temperature flue gas generated by combustion of the combustion chamber 6 is not directly contacted with the outside, is directly conveyed to the drying roller 3, and is finally treated by the foam dust remover 5.
The vibrating screen 8 is in a ladder shape, six stages are provided, the size of a screen opening of the vibrating screen can be adjusted, the vibrating screen is provided with two layers of vibrating screens, the shapes of the upper layer of vibrating screen and the lower layer of vibrating screen are identical, and the two layers of vibrating screens are arranged in a staggered mode.
The drying roller 3 is divided into three sections, namely an initial section, a core section and an end section, wherein a high-temperature flue gas inlet 303 and a fresh air inlet 302 are arranged in the initial section so as to mix the two gases; the core section is a roller and is used for drying lump ores, and is provided with a mixed gas No. 2 inlet and a feeding chute opening; the end sections are a discharge chute 305 and a flue gas outlet 304. The initial section high temperature flue gas inlet 303, the fresh air inlet 302, the core section mixed gas inlet and the end section flue gas outlet 304 of the drying roller 3 are all provided with thermocouples and flow meters.
The following calculation formulas are used in the embodiments:
the formula of the moisture evaporation amount of lump ore is as follows:
m is in w The evaporation capacity of water is t/h; g w The flow rate is the lump ore flow rate, t/h; v 1 Wet base moisture before lump ore drying,%; v 2 Drying lump oreMoisture of wet base,%.
The drying efficiency formula of lump ore is as follows:
wherein eta is lump ore drying efficiency.
The flow formula of the high-temperature flue gas meeting the lump ore drying requirement is as follows:
wherein L is m1 For drying the mixed gas 2 flow, m of the core section of the roller 3 /h；m w The water evaporation capacity is kg/h; ρ is the density of smoke at 20 ℃ and kg/m 3 ；x m1 The moisture content of the mixed gas No. 2 at the inlet of the drying roller is kg/kg; x is x m2 In order to control the moisture content of the flue gas at the outlet of the drying drum, kg/kg.
Example 1
As shown in fig. 1 to 5, the drying and screening of lump ore is performed as follows:
s1 anticipates: the lump ore raw materials are conveyed to a front weighing chamber 2 through a belt 1, and raw data such as lump ore quality, moisture and the like are measured and recorded.
S2, drying: the method comprises the steps of conveying lump ore in a front weighing chamber 2 to a core section of a drying roller 3 by using a belt 1, calculating the gas air-fuel ratio, then carrying out mixed gas No. 1 proportioning in a gas storage tank according to the gas air-fuel ratio, then introducing a combustion chamber 6 by using a pipeline, introducing high-temperature flue gas generated by combustion of the combustion chamber 6 into an initial section of the drying roller by using the pipeline, arranging a fresh air port 302 in the initial section of the drying roller, mixing the two gases, introducing the mixed gas No. 2 into the core section of the drying roller to carry out lump ore drying work, after the drying work is finished, treating the flue gas generated in the drying process by using a foam dust remover 5, discharging the dried lump ore, conveying the dried lump ore to a rear weighing chamber 4 by using the belt 1, measuring the moisture content of the lump ore, and conveying the lump ore to a vibrating screen 8 and calculating the drying efficiency of the lump ore if the drying result meets the requirement of the lump ore moisture of less than 2%.
S3, screening: the required screening particle size screening net mouth is selected, the screening net mouth is sent to a six-stage vibrating screen 8 for lump ore screening, screened small particles fall into a collecting bin 9, dust generated by vibration is sucked into an electrostatic precipitator 10, the dust generated in the dust removing process and the small particles in the collecting bin are regarded as byproducts, the byproducts are sent to the next working procedure by using a belt 1, lump ores left by the vibrating screen 8 are regarded as products, and finally the products are brought into a blast furnace by using the belt for smelting.
S4, data recording: recording the gas air-fuel ratio, the high-temperature flue gas and fresh air flow which are required by drying, the mixed gas No. 2 flow and temperature which are introduced into the initial section of the drying roller, the drying efficiency of the lump ore and the moisture content of the final lump ore under different moisture of the lump ore, and accumulating data according to the corresponding gas air-fuel ratio, the high-temperature flue gas and fresh air flow which are introduced into the initial section of the drying roller, the mixed gas No. 2 flow and temperature which are introduced into the core section of the drying roller, the drying efficiency of the drying roller and the moisture content of the final lump ore.
S5, ending: and (5) drying and screening the lump ores, stopping the operation of equipment, maintaining and cleaning the equipment, and recording a work log.
Example 2
The procedure of example 1 is the same, except that in the step of S2 drying, the first drying moisture of lump ore does not meet the requirement of 2%, and the second drying operation of lump ore is needed.
The specific operation is as follows: firstly, conveying lump ores which do not meet the standard moisture requirement to an aggregate pool 9 by using a belt 1, improving the gas air-fuel ratio on the basis of the gas air-fuel ratio calculated for the first time, or improving the high-temperature flue gas flow rate of an initial section of a drying roller, or reducing the fresh air quantity introduced into the initial section of the drying roller, thereby improving the temperature of mixed gas No. 2 of a core section of the drying roller, drying the lump ores in the same batch, conveying the lump ores to a vibrating screen if the moisture of the dried lump ores is lower than 2%, and carrying out secondary drying on the lump ores stored in the aggregate pool in the environment; if the moisture of the dried lump ore is still lower than 2%, conveying the dried lump ore to an aggregate pool 9, and readjusting the gas air-fuel ratio, the high-temperature flue gas flow conveyed to the initial section of the drying roller and the fresh air quantity introduced to the initial section of the drying roller until the moisture of the finally dried lump ore is lower than 2%.
Example 3
The procedure of example 1 was the same except that the screen opening of the vibrating screen 8 was changed so that fine selection of different particle diameters was performed.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention. The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (1)
1. A large batch lump ore stoving and screening system, its characterized in that: the drying system comprises a belt, a front weighing chamber, a drying roller and a rear weighing chamber, lump ore enters the front weighing chamber through the belt to be weighed, enters the drying roller through a feeding chute after being weighed, the drying roller is divided into an initial section, a core section and an end section, the initial section of the drying roller is provided with a fresh air inlet and a high-temperature flue gas inlet, the high-temperature flue gas inlet is connected with a combustion chamber, the combustion chamber is connected with an air storage chamber, the end section of the drying roller is provided with a flue gas outlet and a discharge chute opening, the flue gas outlet is connected with a foam dust remover, and the lump ore is communicated to the rear weighing chamber through the discharge chute opening;
the screening system comprises a vibrating screen, a collecting bin and an electrostatic precipitator, bulk ore in the rear weighing chamber is conveyed to the vibrating screen through a belt, a discharge hole is formed in the lower portion of the vibrating screen and leads to the collecting bin, and the upper portion of the vibrating screen is connected with the electrostatic precipitator;
the method comprises the following steps:
s1 anticipates: conveying the lump ore raw materials to a front weighing chamber through a belt, and measuring and recording the lump ore quality and the water content raw data;
s2, drying: the belt is used for conveying the lump ore in the front weighing chamber to the core section of the drying roller, and calculating the air-fuel ratio of the gas,
the gas air-fuel ratio calculation process comprises the following steps: calculating the calorific value of each kilogram of measured gas and the theoretical air quantity of the gas in a standard state by using the low calorific value of the gas, and then solving the gas combustion air-fuel ratio according to the range of the air excess coefficient of the complete combustion of the gas between 1.05 and 1.15;
then, mixing gas No. 1 in a gas storage tank according to the gas air-fuel ratio, then, introducing the gas into a combustion chamber by using a pipeline, introducing high-temperature flue gas generated by combustion in the combustion chamber into an initial section of a drying roller by using the pipeline, arranging a fresh air port in the initial section of the drying roller to mix the gas and the gas, introducing the gas No. 2 into a core section of the drying roller to perform lump ore drying, after the drying is finished, treating the flue gas generated in the drying process by using a foam dust remover, discharging the treated flue gas, conveying the dried lump ore to a rear weighing chamber by using a belt, measuring the moisture content of the lump ore, and conveying the lump ore to a vibrating screen and calculating the drying efficiency of the lump ore if the drying result meets the requirement that the moisture content of the lump ore is less than 2%; if the drying result does not meet the requirement that the lump ore moisture is less than 2%, conveying the lump ore to an aggregate pool by using a belt to wait for secondary drying, and adjusting the temperature of a high-temperature flue gas inlet to ensure that the lump ore drying moisture meets the requirement of 2%;
the secondary drying process comprises the following steps: adjusting the temperature and flow of flue gas introduced into the core section of the drying roller, directly feeding the lump ore which does not reach the lump ore moisture standard from the aggregate pool into a front weighing pool for moisture detection, and then conveying the lump ore to the drying roller for secondary drying until the lump ore moisture is less than 2%, and stopping the flow;
s3, screening: selecting a screening screen opening with the required screening particle size, conveying the screen opening to a six-stage vibrating screen for lump ore screening, enabling screened small particles to fall into a collecting bin, sucking dust generated by vibration into an electrostatic precipitator, enabling ash generated in the dust removing process and the small particles in the collecting bin to be considered as byproducts, conveying the byproducts to the next working procedure by using a belt, enabling lump ores left by the vibrating screen to be considered as products, and finally conveying the products to a blast furnace by using the belt for smelting;
s4, data recording: recording the gas air-fuel ratio required by drying, the high-temperature flue gas and fresh air flow which are introduced into the initial section of the drying roller, the mixed gas No. 2 flow and temperature which are introduced into the core section of the drying roller, the drying efficiency of the lump ore and the moisture of the final lump ore in order to meet the requirement that the moisture of the lump ore is less than 2 percent, and finally forming a corresponding related parameter table of the lump ore under the different moisture;
s5, ending: drying and screening the lump ores, stopping the operation of equipment, maintaining and cleaning the equipment, and recording a work log;
the measures for adjusting the temperature and flow of the mixed gas introduced into the core section of the drying roller mainly comprise: on the basis of the primary gas air-fuel ratio, the gas air-fuel ratio is improved, or the flow of the mixed gas No. 1 entering the combustion chamber is improved, or the flow and the temperature of high-temperature flue gas entering the initial section of the drying roller are improved, or the flow of fresh air entering the initial section of the drying roller is reduced, or the flow and the temperature of the mixed gas No. 2 in the core section of the drying roller are improved;
the drying system is airtight, high-temperature flue gas generated by combustion of the combustion chamber is not directly contacted with the outside, is directly conveyed to the drying roller, and is finally treated by the foam dust remover;
the vibrating screen is in a ladder shape, six stages are provided, the size of a screen opening of the vibrating screen can be adjusted, the vibrating screen is provided with two layers of vibrating screens, the shapes of the upper layer of vibrating screen and the lower layer of vibrating screen are identical, and the two layers of vibrating screens are arranged in a staggered manner;
the mixed gas No. 1 is a mixed gas of coal gas and air, and the mixed gas No. 2 is a mixed gas of high-temperature flue gas and fresh air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210305427.7A CN114623666B (en) | 2022-03-25 | 2022-03-25 | Large-batch lump ore drying and screening system and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210305427.7A CN114623666B (en) | 2022-03-25 | 2022-03-25 | Large-batch lump ore drying and screening system and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114623666A CN114623666A (en) | 2022-06-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202277954U (en) * | 2011-09-26 | 2012-06-20 | 北京金隅红树林环保技术有限责任公司 | Stepped vibrating screen |
| CN103013615A (en) * | 2012-12-19 | 2013-04-03 | 华电电力科学研究院 | Efficient drying and quality-improving device and method for brown coal |
| CN203526070U (en) * | 2013-10-17 | 2014-04-09 | 湖北新冶钢特种钢管有限公司 | Low-cost lump ore drying and screening system for iron smelting |
| CN107127150A (en) * | 2017-07-09 | 2017-09-05 | 王先华 | A kind of Sand screen with heating and dehumidification function |
| CN107552388A (en) * | 2017-09-30 | 2018-01-09 | 广州公孙策信息科技有限公司 | A kind of centrifugal high effective Chinese medicinal material drying dry screen screening device |
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- 2022-03-25 CN CN202210305427.7A patent/CN114623666B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202277954U (en) * | 2011-09-26 | 2012-06-20 | 北京金隅红树林环保技术有限责任公司 | Stepped vibrating screen |
| CN103013615A (en) * | 2012-12-19 | 2013-04-03 | 华电电力科学研究院 | Efficient drying and quality-improving device and method for brown coal |
| CN203526070U (en) * | 2013-10-17 | 2014-04-09 | 湖北新冶钢特种钢管有限公司 | Low-cost lump ore drying and screening system for iron smelting |
| CN107127150A (en) * | 2017-07-09 | 2017-09-05 | 王先华 | A kind of Sand screen with heating and dehumidification function |
| CN107552388A (en) * | 2017-09-30 | 2018-01-09 | 广州公孙策信息科技有限公司 | A kind of centrifugal high effective Chinese medicinal material drying dry screen screening device |
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| CN114623666A (en) | 2022-06-14 |
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