CN113804000A - Microwave and hot waste gas combined heating and drying system and method for blast furnace lump ore - Google Patents
Microwave and hot waste gas combined heating and drying system and method for blast furnace lump ore Download PDFInfo
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- CN113804000A CN113804000A CN202010556208.7A CN202010556208A CN113804000A CN 113804000 A CN113804000 A CN 113804000A CN 202010556208 A CN202010556208 A CN 202010556208A CN 113804000 A CN113804000 A CN 113804000A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/02—Sintering grates or tables
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/10—Arrangements for using waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0063—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising endless belts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
- F27D2099/0028—Microwave heating
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
本发明公开了一种高炉块矿微波热废气组合加热干燥系统和方法，该加热干燥系统包括链篦机（10）、进料装置和加热干燥装置组合，加热干燥装置组合包括微波加热装置（14），微波加热装置设置于链篦机的上方，微波发射端口向下朝向链篦机；加热干燥装置组合还包括热废气鼓风装置（12），热废气鼓风装置设置于链篦机的下方，鼓风出口（13）向上朝向链篦机；该加热干燥方法包括进料装置将高炉块矿（15）铺料在链篦机上，微波加热装置对链篦机上的高炉块矿发射微波加热干燥，热废气鼓风装置将外部热废气输送透过链篦机对高炉块矿加热干燥。该加热干燥系统和方法将微波与热废气结合后对高炉块矿加热干燥，能够实现高效低能耗的加热干燥处理。
The invention discloses a microwave-heated waste gas combined heating and drying system and method for blast furnace lump ore. The heating and drying system comprises a grate machine (10), a feeding device and a combination of a heating and drying device, and the heating and drying device combination comprises a microwave heating device (14). ), the microwave heating device is arranged above the chain grate machine, and the microwave emission port faces the chain grate machine downward; the heating and drying device combination also includes a hot exhaust gas blowing device (12), and the hot exhaust gas blowing device is arranged below the chain grate machine. , the blast outlet (13) faces the chain grate upwards; the heating and drying method comprises that the feeding device spreads the blast furnace lump ore (15) on the chain grate, and the microwave heating device emits microwaves to heat and dry the blast furnace lump ore on the chain grate , the hot exhaust gas blowing device transports the external hot exhaust gas through the chain grate to heat and dry the blast furnace lump ore. The heating and drying system and method combine microwave and hot exhaust gas to heat and dry blast furnace lump ore, and can realize heating and drying treatment with high efficiency and low energy consumption.
Description
Technical Field
The invention relates to a pretreatment system and a pretreatment method for blast furnace ore materials, in particular to a microwave and hot waste gas combined heating and drying system and a microwave and hot waste gas combined heating and drying method for blast furnace lump ores.
Background
Blast furnace iron making has certain requirements on the granularity of mineral aggregate, the granularity of the mineral aggregate is generally required to be 5-40mm, in order to meet the requirements, the traditional method is to carry out sintering and pelletizing processes on the mineral aggregate, however, the two processes can generate a large amount of environmental pollution, and with the continuous improvement of environmental protection requirements, the reduction of pollution emission in the production process becomes an important subject to be faced.
The blast furnace smelting by using the lump ore is an effective and environment-friendly method, the blast furnace lump ore can be directly used without pretreatment and pollutant discharge, the cost is low, the blast furnace lump ore ratio is improved, the cost can be reduced, the discharge can be reduced, and the method is one of important technical directions for iron making development. However, in the process of mining, stockpiling, transporting and the like, the moisture content of lump ore is higher due to the reasons of mining below underground water level, water drenching for preventing dust raising, experiencing rainy and snowy days and the like, the powder content of the lump ore is higher due to the fact that fine powder is adhered to the surface of the lump ore and the moisture content is higher, particularly in the screening process, sieve holes and screens are easy to block, even feed bins are blocked in severe cases, and the smoothness of material flow in the production process and the stability of blast furnace production are seriously influenced; in addition, after the high-water-content ores enter the blast furnace, the temperature of the furnace top gas is reduced due to vaporization and heat absorption of water, so that a dry type dust removal system of the blast furnace gas easily forms a condensation sticky cloth bag, and the blast furnace is forced to reduce the lump ore proportion or increase the fuel consumption to increase the top temperature, thereby increasing the production cost of the molten iron. Because of the adverse effect of high moisture on production, lump ore is dried before being screened, in particular, to avoid the adverse effect.
At present, the heating and drying mode of lump ore is mainly a heat conduction heating and drying mode, for example, Chinese patent (CN 201962330U) discloses a lump ore baking system of a sinter cooler, wet lump ore is quantitatively added to hot sinter ore of a sintering machine circular cooler, mixed ore with the temperature of about 80 ℃ can be formed by using the residual heat of the sinter ore at about 300 ℃ for about 30 minutes, and the mixed ore is sintered by an existing screening system to obtain the hot mixed ore with the powder content of less than 5 percent and is sent to a blast furnace for use. The advantage of this patent technical scheme is that utilize existing waste heat resource in the factory, handles with low costsly, and drying effect is good, is not enough to lie in three aspects: firstly, a hopper and a weighing device are required to be additionally arranged on the circular cooler; secondly, the efficiency of the existing waste heat boiler of the circular cooler is influenced; thirdly, the fluctuation of chemical components of the mixed ore is caused by the fluctuation of moisture and powder rate of the lump ore, so that the fluctuation of the alkalinity of the blast furnace slag is easily caused, and the quality of the blast furnace molten iron is influenced. In addition, utilize the principle of heat-conduction to carry out the drying of heating, heat-conduction heating process needs the certain time, and heat loss still has unavoidably in the heat-conduction process moreover, consequently the efficiency of drying by heating is not high, can't satisfy the requirement that high strength production rhythm was rhythm.
Disclosure of Invention
The invention aims to provide a system and a method for heating and drying blast furnace lump ore by combining microwave and hot waste gas, which can heat and dry the blast furnace lump ore after the microwave and the hot waste gas are combined, and can carry out high-efficiency low-energy-consumption heating and drying treatment on the blast furnace lump ore, thereby ensuring the normal operation of a blast furnace.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a microwave and hot waste gas combined heating and drying system for blast furnace lump ore comprises a chain grate, a feeding device and a heating and drying device combination, wherein the feeding device is arranged at the initial end of the chain grate and is positioned above the chain grate; the heating and drying device combination comprises a microwave heating device, the microwave heating device is arranged above the chain grate, and a microwave emission port of the microwave heating device faces downwards to the chain grate; the heating and drying device combination further comprises a hot waste gas blowing device, the hot waste gas blowing device is arranged below the chain grate, and a blowing outlet of the hot waste gas blowing device faces upwards to the chain grate.
Further, the feeding device comprises a feeding conveyor belt and a roller screen, the roller screen is positioned between the feeding conveyor belt and the chain grate, the roller screen is inclined downwards, and the direction of the downward inclination of the roller screen is opposite to the conveying direction of the chain grate.
Further, the feeding conveyor belt comprises a swing conveyor belt and a wide-face conveyor belt, the wide-face conveyor belt is located between the swing conveyor belt and the roller screen, and the wide-face conveyor belt is located at the tail end of the swing conveyor belt.
Furthermore, a plurality of infrared thermometers are arranged in the microwave heating device from an inlet to an outlet, and the detection ends of the infrared thermometers face the chain grate; and moisture detectors are arranged at the inlet and the outlet of the heating and drying device combination, and the detection ends of the moisture detectors face the chain grate.
A blast furnace lump ore microwave and hot waste gas combined heating and drying method based on the heating and drying system comprises the following steps:
and 3, carrying out heating and drying treatment on the blast furnace lump ore on the chain grate by the combination of the heating and drying device, wherein the method comprises the following steps:
step 3.1, the microwave heating device emits microwave to the blast furnace lump ore on the chain grate for heating and drying;
3.2, conveying and blowing external hot waste gas to a chain grate by a hot waste gas blowing device, wherein the hot waste gas penetrates through the chain grate to heat and dry the blast furnace lump ore;
and 4, conveying the blast furnace lump ore away from the heating and drying device assembly by the chain grate.
Further, the step 1 comprises:
step 1.1, a feeding conveyor belt receives blast furnace lump ore conveyed from a previous process, and the feeding conveyor belt conveys the blast furnace lump ore to a roller screen;
and step 1.2, screening the blast furnace lump ore into two layers according to the granularity by using a roller screen, and then paving the two layers on a chain grate, wherein the granularity of the upper layer blast furnace lump ore is smaller than that of the lower layer blast furnace lump ore.
Further, the step 1.1 comprises:
step 1.1.1, a swing conveyor belt receives blast furnace lump ore conveyed from a previous process, and the swing conveyor belt conveys the blast furnace lump ore to a wide-face conveyor belt in a left-right swing mode according to a set conveying speed and a set swing angle;
and step 1.1.2, conveying the blast furnace lump ore to a roller screen by a wide-surface conveyor belt.
Further, the step 1.1.1 further includes: setting a target paving thickness range of the blast furnace lump ore on the grate, and setting the transmission speed of the swinging conveyor belt as a target transmission speed, wherein the target transmission speed of the swinging conveyor belt can be matched with the transmission speed of the grate, so that the paving thickness of the blast furnace lump ore on the grate is in the target paving thickness range; the target paving thickness range of the blast furnace lump ore is set to be 150-400 mm.
Further, the step 3 further comprises:
and 3.3, controlling and adjusting the microwave transmitting power of the microwave heating device and the blast flow of the hot waste gas blast device according to the temperature and the moisture content of the blast furnace lump ore detected by the infrared temperature detector and the moisture detector.
Further, the step 3 further comprises:
and 3.4, controlling and adjusting the running speed of the feeding device and the chain grate according to the moisture content of the blast furnace lump ore detected by the moisture detector.
Compared with the existing heating and drying treatment method, the heating and drying system and the method have the advantages that firstly, microwaves have the characteristic of selective heating, the microwave absorbing strength of materials is usually measured by adopting the size of dielectric constant, the dielectric constant of water is 60-78, and the dielectric constant of hematite is 25, so that ores with higher water content can absorb microwaves more easily, the temperature is rapidly increased, drying and dehydration are carried out, and lump ores with lower water content absorb microwaves weakly, so that the lump ores with higher water content can be heated preferentially, and the heating efficiency is higher; secondly, due to the characteristics of penetrability and body heating of the microwaves, the emitted microwaves can go deep into the mineral aggregate for heating, steam generated by drying can be smoothly discharged, and the problem that the heat transfer direction and water vapor migration are reverse in the traditional drying and heating process is solved, so that the heating efficiency is further improved; thirdly, the transmitting power of the microwave can be flexibly controlled and adjusted according to the material flow and the moisture, and the heating process is easy to control; fourthly, fossil fuel is not needed to be used in the heating process, no dust and smoke are discharged, and no pollution is discharged in the heating process; fifthly, the purpose of recycling waste heat of the waste gas can be achieved by adopting hot waste gas for heating, so that the energy consumption is reduced; and sixthly, the microwaves are intensively acted on the water on the middle upper part of the material layer to enable the water to be converted into water vapor, and the water vapor rapidly flows away from the material layer under the action of hot air at the bottom, so that a better synergistic drying effect is achieved.
Compared with the prior art, the microwave and hot waste gas combined heating and drying system and method for the blast furnace lump ore can achieve a good synergistic drying effect by combining the microwave and the hot waste gas to heat and dry the blast furnace lump ore, so that high-efficiency and low-energy-consumption heating and drying treatment for the blast furnace lump ore can be realized, the heating process is easy to control and pollution-free to discharge, the lump ore subjected to heating and drying treatment enters a subsequent screening process, the lump ore screening efficiency can be improved, the phenomenon of blocking a storage bin due to high moisture and powder rate of the lump ore is eliminated, the powder quantity of the blast furnace entering the furnace is reduced, and the normal operation of the blast furnace is guaranteed.
Drawings
FIG. 1 is a front view of a microwave and hot exhaust gas combined heating and drying system for a blast furnace lump ore according to the present invention;
FIG. 2 is a top view of the microwave and hot exhaust gas combined heating and drying system for a blast furnace lump ore;
FIG. 3 is a flow chart of the microwave and hot exhaust gas combined heating and drying method for blast furnace lump ore according to the present invention;
FIG. 4 is a flow chart of step 1 in the drying method by microwave and hot waste gas combined heating of blast furnace lump ore;
FIG. 5 is a flow chart of step 1.1 in the drying method by microwave and hot waste gas combined heating of blast furnace lump ore;
FIG. 6 is a flow chart of step 3 in the drying method by microwave and hot waste gas combined heating of blast furnace lump ore.
In the figure: 1-swing conveyor belt, 2-wide conveyor belt, 3-roller screen, 4-moisture detector, 5-infrared temperature detector, 7-microwave emission unit, 8-sealing cover, 9-chimney, 10-grate, 12-hot waste gas blast device, 13-blast outlet, 14-microwave heating device, and 15-blast furnace lump ore.
Detailed Description
The invention will be further described with reference to the following figures and specific examples:
referring to fig. 1 and 2, the present embodiment provides a microwave and hot exhaust gas combined heating and drying system for a blast furnace lump ore, which includes a grate 10, a feeding device disposed at a starting end of the grate 10 and above the grate 10, and a heating and drying device combination disposed at a middle section of the grate 10.
The heating and drying device combination comprises a microwave heating device 14, the microwave heating device 14 is arranged above a chain grate 10, a microwave emission port of the microwave heating device 14 faces downwards to the chain grate 10, more specifically, the microwave heating device 14 comprises a sealing cover 8, a chimney 9 and 16 microwave emission units 7, the sealing cover 8 covers above the chain grate 10 to form a microwave heating space, the sealing cover 8 is made of stainless steel to prevent microwave leakage and diffusion, the chimney 9 is arranged above the sealing cover 8, steam generated by heating in the sealing cover 8 can be discharged through the chimney 9, the 16 microwave emission units 7 are fixedly arranged on the upper side of the sealing cover 8, namely the microwave emission units 7 are arranged above the chain grate 10, the microwave emission port of the microwave emission unit 7 faces downwards to the chain grate 10, so that microwave heating can be emitted to the blast furnace lump ore 15 on the grate 10.
In this embodiment, the microwave emitting unit 7 is specifically composed of a microwave source and a waveguide tube, the waveguide tube is fixedly connected with the sealing cover 8, the outlet of the waveguide tube is the microwave emitting port, the outlet of the waveguide tube faces downward to the grate 10, the inlet of the waveguide tube is connected with the microwave source, and the microwave emitted by the microwave source is emitted to the blast furnace lump ore 15 on the grate 10 through the waveguide tube; the 16 microwave transmitting units 7 are arranged at certain intervals, specifically, in a mode of 2 rows and 8 rows; in other embodiments according to the present invention, the number of the microwave emitting units 7 may be set to several according to the actual heating requirement, and the arrangement of the microwave emitting units 7 may also be set according to the actual situation, which follows the principle that the effective and balanced microwave heating and drying effect of the blast-furnace lump ore 15 on the grate 10 is obtained.
The heating and drying device combination further comprises a hot waste gas blowing device 12, the hot waste gas blowing device 12 is arranged below the chain grate machine 10, a blowing outlet 13 of the hot waste gas blowing device 12 faces upwards to the chain grate machine 10, the hot waste gas blowing device 12 is used for conveying various hot waste gases generated in a production operation area and blowing the hot waste gases to the chain grate machine 10, and the hot waste gases can heat and dry the blast furnace lump ore 15 on the chain grate machine 10 after penetrating through the chain grate machine 10, so that the purpose of waste gas waste heat recycling is achieved; the inside of the hot waste gas blowing device 12 is provided with a heat insulation material, and the sources of the hot waste gas transmitted in the hot waste gas blowing device 12 mainly include hot waste gas of a sintering circular cooler, a hot blast stove and the like.
The feeding device comprises a feeding conveyor belt and a roller screen 3, the roller screen 3 is positioned between the feeding conveyor belt and the chain grate machine 10, the roller screen 3 inclines downwards, the downward inclination direction of the roller screen 3 is opposite to the conveying direction of the chain grate machine 10, and the screen gap of the roller screen 3 is 10-15 mm; the feeding conveyor belt is used for receiving the mineral aggregate conveyed from the previous process and then conveying the mineral aggregate to the roller screen 3 for screening, because the inclined direction of the roller screen 3 is opposite to the conveying direction of the chain grate 10, the blast furnace lump ore 15 with large granularity can roll to a position relatively more upstream of the chain grate 10 along the inclined direction of the roller screen 3 for spreading, the blast furnace lump ore 15 with small granularity can fall onto the chain grate 10 through the screen gaps of the roller screen 3, because the blast furnace lump ore 15 with large granularity is spread at the upstream of the chain grate 10, the blast furnace lump ore 15 with small granularity falling from the screen gaps can fall onto the blast furnace lump ore 15 with large granularity, and therefore, after the blast furnace lump ore 15 is screened by the roller screen 3, the blast furnace lump ore 15 on the chain grate 10 is of a two-layer spreading structure with small granularity at the top and large granularity at the bottom.
More specifically, the feeding conveyor belt comprises a swing conveyor belt 1 and a wide-face conveyor belt 2, the wide-face conveyor belt 2 is positioned between the swing conveyor belt 1 and a roller screen 3, the wide-face conveyor belt 2 is positioned at the tail end of the swing conveyor belt 1, and the swing conveyor belt 1 can swing left and right according to a certain swing angle to deliver blast furnace lump ore 15 onto the wide-face conveyor belt 2, so that wide blast furnace lump ore 15 paving materials are formed on the wide-face conveyor belt 2 and the chain grate 10. The wide spreading mode can solve the contradiction of inconsistent front and back conveying speeds, just like in the embodiment, the conveying speed of the swing conveying belt 1 is high, the conveying speed of the chain grate machine 10 is low, in order to make up the difference between the two, wide spreading can be carried out on the chain grate machine 10, and the matching of the speeds of the two can be realized under the condition that the total quantity of the conveyed mineral materials is consistent.
In order to facilitate the understanding of the temperature condition of the blast furnace lump ore 15, a plurality of infrared temperature detectors 5 are arranged in the microwave heating device 14 from an inlet to an outlet, and the detection ends of the infrared temperature detectors 5 face the chain grate 10; in order to facilitate understanding of the moisture content of the blast furnace lump ore 15, moisture detectors 4 are provided at the inlet and outlet of the heating and drying apparatus combination, and the detection ends of the moisture detectors 4 face the grate 10.
Further preferably, a control terminal is further included in the heating and drying system, and the swing conveyor belt 1, the broad conveyor belt 2, the microwave emitting unit 7, the grate 10 and the hot exhaust air blowing device 12 in the heating and drying system are all in communication connection with the control terminal, so that the operation of the devices is controlled by the control terminal, specifically, the control terminal can be operated by an operator to control the microwave emitting power of the microwave emitting unit 7, the conveying speed of the grate 10, the swing angle and the conveying speed of the swing conveyor belt 1, the conveying speed of the broad conveyor belt 2, the blowing intensity of the hot exhaust air blowing device 12 and the like; in addition, the moisture detector 4 and the infrared temperature detector 5 are also in communication connection with the control terminal, detection signals of the moisture detector 4 and the infrared temperature detector 5 can be transmitted to the control terminal in real time, and an operator can know the temperature and the moisture content of the blast furnace lump ore 15 in real time through the control terminal.
In order to ensure that the microwave environment on site is lower than the national standard requirement, a microwave detector is also arranged on the operation site of the heating and drying system to monitor the microwave leakage condition.
Referring to fig. 3 and fig. 6, the present embodiment further provides a method for drying a blast furnace lump ore by microwave and hot waste gas combined heating, the method for drying by heating is based on the above system for drying a blast furnace lump ore by microwave and hot waste gas combined heating, and the method includes:
and 3, carrying out heating and drying treatment on the blast furnace lump ore 15 on the chain grate 10 by the combination of the heating and drying device, wherein the heating and drying device comprises:
step 3.1, the microwave heating device 14 emits microwave to dry the blast furnace lump ore 15 on the grate 10, and more specifically, a plurality of microwave emitting units 7 in the microwave heating device 14 emit microwave to dry the blast furnace lump ore 15 on the grate 10, especially to the blast furnace lump ore 15 at the middle upper part of the material bed;
step 3.2, conveying and blowing external hot waste gas to the chain grate 10 by the hot waste gas blowing device 12, wherein the hot waste gas penetrates through the chain grate 10 to heat and dry the blast furnace lump ore 15, and particularly for the blast furnace lump ore 15 at the bottom of the material layer, moisture of the blast furnace lump ore 15 is evaporated after the blast furnace lump ore 15 is heated, so that the aim of drying the lump ore is fulfilled;
Because the microwave can produce stronger heating effect to the lump ore that the moisture content is higher, and the produced heating effect to the lump ore that the moisture content is lower is then relatively lower, and the microwave that launches is gone deep into the inside heating of mineral aggregate, consequently utilize the microwave to the drying efficiency that heats of blast furnace lump ore 15 higher, do not utilize fossil fuel combustion heating moreover, the pollution-free emission of heating process.
In this embodiment, the heating and drying of the blast furnace lump ore 15 are performed by combining microwave heating and hot exhaust gas heating, the hot exhaust gas blown by the hot exhaust gas blowing device 12 is blown into the blast furnace lump ore 15 on the grate 10 from bottom to top, the moisture of the blast furnace lump ore 15 at the lower layer on the grate 10 starts to evaporate under the action of hot wind, the evaporated moisture enters the blast furnace lump ore 15 at the upper layer under the driving of the upward hot wind, the moisture in the blast furnace lump ore 15 at the upper layer rapidly increases the temperature and evaporates under the action of the microwave heating, and the water vapor generated by the moisture evaporation can be discharged from the chimney 9. The heating method combining microwave and hot waste gas is adopted to heat and dry the blast furnace lump ore 15, the operation efficiency is high, the drying effect is good, and particularly, the combined heating method can realize stable and reliable drying effect in rainy and snowy days or extreme low-temperature meteorological conditions.
In order to ensure that the blast furnace lump ore 15 does not burst due to the excessive temperature, in the present embodiment, the temperature of the hot exhaust gas output from the hot exhaust gas blowing device 12 is controlled within the range of 140 ℃ to 200 ℃.
On one hand, for blast furnace smelting, the blast furnace lump ore 15 with too small particle size affects the air permeability of blast furnace burden, causes the pressure difference on the upper part of the blast furnace to rise, and affects the normal operation of the blast furnace, so that the blast furnace lump ore 15 has to ensure enough particle size; on the other hand, the higher the temperature of the blast furnace lump ore 15 is, the more likely the blast furnace lump ore 15 is to be cracked, and particularly when the temperature of the blast furnace lump ore 15 exceeds 300 ℃, the stress concentration inside the blast furnace lump ore 15 is particularly severe, and the blast furnace lump ore 15 is likely to be cracked, so that in the present embodiment, the heating temperature of the blast furnace lump ore 15 is controlled to be below 200 ℃, thereby avoiding the situation of the blast furnace lump ore 15 being cracked as much as possible, and ensuring that the particle size of the blast furnace lump ore 15 is not reduced after being dried.
Referring to fig. 4, optimally, the step 1 includes:
step 1.1, a feeding conveyor belt receives blast furnace lump ore 15 conveyed from a previous process, and the feeding conveyor belt conveys the blast furnace lump ore 15 to a roller screen 3;
step 1.2, the roller screen 3 screens the blast furnace lump ore 15 into two layers according to the granularity, and then the two layers are paved on the chain grate 10, wherein the granularity of the upper layer blast furnace lump ore 15 is smaller than that of the lower layer blast furnace lump ore 15.
The specific process of screening the blast furnace lump ore 15 by the roller screen 3 is that large-particle-size mineral materials in the blast furnace lump ore 15 roll down onto the chain grate machine 10 along the inclined direction of the roller screen 3, small-particle-size mineral materials in the blast furnace lump ore 15 fall onto the chain grate machine 10 through screen gaps of the roller screen 3, and because the inclined direction of the roller screen 3 is opposite to the running direction of the chain grate machine 10, the falling position of the large-particle-size mineral materials is more upstream than the falling position of the small-particle-size mineral materials, when the small-particle-size blast furnace lump ore 15 falls, the large-particle-size blast furnace lump ore 15 is already paved on the chain grate machine 10, and the small-particle-size blast furnace lump ore 15 falls onto the large-particle-size blast furnace lump ore 15, so that a two-layer blast furnace lump ore 15 paving structure with a small upper layer and a large layer is realized on the chain grate machine 10.
In general, the blast furnace 15 having a small particle size has a large number of gaps and a dense gap, and has poor air permeability, so that moisture is easily accumulated, and the moisture content of the blast furnace 15 having a small particle size is high; the blast furnace lump ore 15 is layered, and the blast furnace lump ore 15 with small granularity is positioned on the upper layer, so that the blast furnace lump ore 15 can directly receive the microwave emitted by the microwave heating device 14, the moisture in the blast furnace lump ore can be quickly evaporated, and the microwave heating and drying efficiency is improved integrally.
With reference to fig. 5, further optimally, said step 1.1 comprises:
step 1.1.1, a swing conveyor belt 1 receives blast furnace lump ore 15 conveyed from a previous process, the swing conveyor belt 1 conveys the blast furnace lump ore 15 to a wide-face conveyor belt 2 in a left-right swing mode according to a set conveying speed and a swing angle, a target paving thickness range of the blast furnace lump ore 15 on a grate machine 10 is set, correspondingly, the conveying speed of the swing conveyor belt 1 is set to be a target conveying speed which is matched with the target paving thickness range of the blast furnace lump ore 15, specifically, the target conveying speed of the swing conveyor belt 1 can be matched with the conveying speed of the grate machine 10, so that the paving thickness of the blast furnace lump ore 15 on the grate machine 10 is in the target paving thickness range; in the present embodiment, the target aggregate thickness range of the blast furnace lump ore 15 is set to 150-400 mm. The conveying speed of the oscillating conveyor 1 is here the feed speed of the feeding device.
Step 1.1.2, the wide-face conveyor belt 2 conveys the blast furnace lump ore 15 to the roller screen 3.
Before drying the blast furnace lump ore 15, the blast furnace lump ore 15 is firstly paved on the chain grate 10, the swinging conveyor belt 1 receives the blast furnace lump ore 15 from the previous process and then paves the blast furnace lump ore 15 on the chain grate 10 through the wide-face conveyor belt 2 in a swinging mode, so that the paving of the blast furnace lump ore 15 with a certain width is formed on the chain grate 10, the width is matched with the width of a heating and drying device, and the paving width of the blast furnace lump ore 15 on the chain grate 10 can be adjusted by adjusting the swinging angle of the swinging conveyor belt 1.
In a normal situation, the paving thickness of the blast furnace lump ore 15 on the grate 10 is adjusted by adjusting the conveying speed of the swinging conveyor belt 1, specifically, the adjustment of the conveying speed of the swinging conveyor belt 1 can be realized only by matching with the conveying speed of the grate 10, when the conveying speed of the grate 10 is not changed, the thickness of the blast furnace lump ore 15 can be adjusted by adjusting the speed of the swinging conveyor belt 1, in short, the paving thickness of the blast furnace lump ore 15 can be increased by increasing the conveying speed of the swinging conveyor belt 1, and the paving thickness of the blast furnace lump ore 15 can be reduced by decreasing the conveying speed of the swinging conveyor belt 1; when the conveying speed of the grate 10 is increased or decreased, the speed of the oscillating conveyor 1 is increased or decreased accordingly to maintain the spreading thickness of the blast furnace 15. The spreading thickness of the blast furnace lump ore 15 can be adjusted by adjusting the conveying speed of the grate 10 in some cases, for example, when the material flow condition of the current process is abnormal and the swing conveyor 1 can only feed at a certain conveying speed, the spreading thickness of the blast furnace lump ore 15 can be thickened by adjusting the speed of the grate 10 slowly, otherwise, the thickness is thinned.
The heating and drying device is combined in the process of heating and drying the blast furnace lump ore 15 on the chain grate 10, and the paving thickness of the blast furnace lump ore 15 is generally required to be within the target paving thickness range of 150-400 mm.
Regarding the 150-400mm target paving thickness range, when the blast furnace lump ore 15 is heated by microwave, the paving thickness of the blast furnace lump ore 15 cannot be too thick and too thin, if the paving thickness is too thick, the microwave cannot penetrate through the blast furnace lump ore 15 on the middle and upper layers, so that the blast furnace lump ore 15 on the middle part cannot obtain a good microwave heating effect, and if the paving thickness of the blast furnace lump ore 15 is too thin, the hot waste gas and the microwave cannot cooperate with each other to heat the blast furnace lump ore 15, the heating and drying treatment capacity of the blast furnace lump ore 15 is small, and the operation efficiency is not high; the microwave emission is usually the lowest power, when the paving thickness of the blast furnace lump ore 15 is too thin, even if the lowest power microwave is used for heating, the emitted microwave can still penetrate through the whole paving thickness, so that the blast furnace lump ore 15 is overheated, and the blast furnace lump ore 15 can burst when the temperature is too high; therefore, the paving thickness of the blast furnace lump ore 15 on the grate 10 needs to be controlled within a certain target range, and multiple tests prove that the effect of microwave heating is good and stable when the paving thickness of the blast furnace lump ore 15 is within the range of 150-400 mm.
In the process of heating and drying the blast furnace lump ore 15, the control of the temperature and the water content of the blast furnace lump ore 15 is an important key point affecting the final drying effect, and therefore, the heating and drying method of the present embodiment also includes the control of the temperature and the water content of the blast furnace lump ore 15.
Referring to fig. 6, for the control of the temperature and the water content of the blast furnace lump ore 15, the step 3 further includes:
and 3.3, controlling and adjusting the microwave emission power of the microwave heating device 14 and the blast flow of the hot waste gas blast device 12 according to the temperature and the moisture content of the blast furnace lump ore 15 detected by the infrared temperature detector 5 and the moisture detector 4, controlling the temperature of the blast furnace lump ore 15 in the heating and drying process to be between 100 ℃ and 200 ℃, and simultaneously controlling the moisture content of the blast furnace lump ore 15 after heating and drying to be within 4%.
The specific process of the step 3.3 is that when the infrared temperature detector 5 detects that the temperature of the blast furnace lump ore 15 is reduced to be close to 100 ℃, the microwave emission power and the blast flow of the hot waste gas blast device 12 are increased, and when the infrared temperature detector 5 detects that the temperature of the blast furnace lump ore 15 is increased to be close to 200 ℃, the microwave emission power and the blast flow of the hot waste gas blast device 12 are decreased, so that the temperature of the blast furnace lump ore 15 in the heating and drying process is always controlled to be between 100 ℃ and 200 ℃, therefore, the temperature of the blast furnace lump ore 15 is controlled in the range, two factors are mainly considered, when the temperature of the blast furnace lump ore 15 is higher than 100 ℃, the moisture of the blast furnace lump ore 15 is favorably and rapidly evaporated, and the temperature of the blast furnace lump ore 15 is controlled to be below 200 ℃, so as to prevent the blast furnace lump ore 15 from bursting due to high temperature; when the temperature of the blast furnace lump ore 15 is controlled, the adjustment of the microwave emission power and the blast flow of the hot waste gas blast device 12 is also carried out according to the moisture content condition of the blast furnace lump ore 15, the control target is that the moisture content of the dried blast furnace lump ore 15 is within 4 percent, when the moisture content of the blast furnace lump ore 15 at the combined outlet of the heating and drying device is close to being more than 4 percent, the microwave emission power of the microwave heating device 14 and the blast flow of the hot waste gas blast device 12 are increased so that more moisture can be evaporated from the blast furnace lump ore 15, and when the moisture content of the blast furnace lump ore 15 at the combined outlet of the heating and drying device is far lower than 4 percent, the microwave emission power of the microwave heating device 14 and the blast flow of the hot waste gas blast device 12 are decreased so as to reduce energy consumption. In the process of controlling the microwave transmitting power of the microwave heating device 14 and the blast flow of the hot exhaust gas blast device 12, the temperature control of the blast furnace lump ore 15 is prioritized, that is, the moisture content of the blast furnace lump ore 15 is controlled under the premise of ensuring that the temperature of the blast furnace lump ore 15 is between 100 ℃ and 200 ℃.
Referring to fig. 6, for the control of the moisture content of the blast furnace lump ore 15, the step 3 further includes:
and 3.4, controlling and adjusting the running speed of the feeding device and the chain grate 10 according to the moisture content of the blast furnace lump ore 15 detected by the moisture detector 4, and controlling the moisture content of the blast furnace lump ore 15 at the combined outlet of the heating and drying device within 4 percent.
The concrete process of step 3.4 is, when the moisture content of the blast furnace lump ore 15 at the combined outlet of the heating and drying device approaches to be about to exceed 4%, the running speed of the feeding device and the chain grate machine 10 is slowed down to increase the retention time of the blast furnace lump ore 15 in the combination of the heating and drying device, so that more moisture can be evaporated, when the moisture content of the blast furnace lump ore 15 at the combined outlet of the heating and drying device is far lower than 4%, the running speed of the feeding device and the chain grate machine 10 can be properly quickened, so as to accelerate the drying operation speed, and improve the operation efficiency; in general, the moisture content of the blast furnace lump ore 15 at the combined outlet of the heating and drying apparatus is controlled to be 4% or less.
When controlling the moisture content of the dried blast furnace lump ore 15, it is usually preferred to control the moisture content of the blast furnace lump ore 15 by adjusting the microwave emitting power of the microwave heating device 14 and the blast flow rate of the hot exhaust gas blast device 12 in step 3.3, and if the moisture content of the blast furnace lump ore 15 cannot be controlled well after the adjustment, the moisture content of the blast furnace lump ore 15 is controlled by adjusting the operation speed of the feeding device and the grate 10 in step 3.4.
In the present embodiment, the blast furnace lump ore 15 comprises moisture detectors at the inlet and outlet of the heating and drying device combination, wherein the inlet moisture detector mainly collects the moisture content of the unheated blast furnace lump ore 15, and provides the basis for the heating and drying operation parameters such as the microwave power of the microwave heating device 14 of the drying device, the blast flow of the hot waste gas blast device 12, the conveying speed of the chain grate 10, and the like, and different heating and drying operation parameters are matched according to different feeding speeds of the feeding device and different moisture content conditions of the blast furnace lump ore 15, so that the heating and drying device combination can dry the lump ore to the moisture content of less than 4% with the lowest energy consumption.
Further optimally, the step 4 further comprises the step of cooling the blast furnace lump ore 15 leaving the heating and drying device combination by a fan, so that the temperature of the blast furnace lump ore 15 is reduced to below 120 ℃ before entering the subsequent conveyor belt, and the subsequent conveyor belt is prevented from being scalded by the high-temperature blast furnace lump ore 15. The cooled blast furnace lump ore 15 is conveyed to the next procedure for screening through a conveyor belt, and finally is added into the blast furnace.
In the embodiment, detection signals of the moisture detector 4 and the infrared temperature detector 5 are transmitted to the control terminal in real time, and an operator can know the temperature condition and the moisture content condition of the blast furnace lump ore 15 through the control terminal; the swinging angle and the conveying speed of the swinging conveyor belt 1, the conveying speed of the broad-face conveyor belt 2, the conveying speed of the chain grate 10, the blowing intensity of the hot waste gas blowing device 12 and the microwave transmitting power of the microwave transmitting unit 7 are controlled by a control terminal, an operator can control the operation of the swinging conveyor belt 1, the broad-face conveyor belt 2, the chain grate 10, the hot waste gas blowing device 12 and the microwave transmitting unit 7 by operating the control terminal, and finally complete the heating and drying process of the blast furnace lump ore 15, and the operator can set an automatic control program in the control terminal to coordinate the operation of the swinging conveyor belt 1, the broad-face conveyor belt 2, the chain grate 10, the hot waste gas blowing device 12 and the microwave transmitting unit 7, so that the heating and drying process of the blast furnace lump ore 15 can be completed accurately, efficiently and with low energy consumption.
In the present embodiment, the time for heating and drying the blast furnace block 15 is controlled to 2 to 10 minutes.
In the process of heating and drying the blast furnace lump ore 15, the blast furnace lump ore 15 undergoes three temperature change stages, namely a preheating stage, a drying and dehydrating stage and a cooling stage; the temperature range of the preheating section is from room temperature to 60 ℃, the temperature range of the drying and dehydrating section is from 60 ℃ to 200 ℃, the cooling section is used for cooling the surface of the ore from 200 ℃ to about 120 ℃, and the heating of the blast furnace block ore 15 can be controlled according to different temperature change stages of the blast furnace block ore 15 in the heating and drying process, so that the optimal heating and drying effect is realized.
Optimally, before the blast furnace lump ore 15 enters the heating and drying system of the embodiment to implement the heating and drying method, the moisture content of the blast furnace lump ore 15 is pre-detected on line at the former process, when the moisture content of the blast furnace lump ore 15 is less than or equal to 4.5%, the blast furnace lump ore 15 is directly conveyed to the subsequent screening process through a bypass conveying line and enters the blast furnace, and only the blast furnace lump ore 15 with the moisture content of more than 4.5% enters the heating and drying system to be heated and dried, so the moisture content of the blast furnace lump ore 15 fed by the feeding device is usually between 4.5% and 7%.
The following description will be made with reference to the following examples:
table 1: drying parameters of comparative examples and examples
| Drying method | Drying Medium temperature,. degree.C | Drying time, min | |
| Comparative example 1 | Rotary kiln and blast furnace gas | 500 | 20 |
| Comparative example 2 | Shaft furnace + blast furnace gas | 800 | 30 |
| Example 1 | Hot exhaust gas plus microwave | 200 | 2 |
| Example 2 | Hot exhaust gas plus microwave | 200 | 4 |
| Example 3 | Hot exhaust gas plus microwave | 180 | 6 |
| Example 4 | Hot exhaust gas plus microwave | 180 | 8 |
| Example 5 | Hot exhaust gas plus microwave | 180 | 10 |
| Example 6 | Hot exhaust gas plus microwave | 150 | 10 |
Table 2: results of the comparative examples and examples
Table 1 above lists the drying parameters of the comparative examples and examples, and table 2 above lists the results of the comparative examples and examples, wherein the comparative examples are the existing heating and drying methods including the heating and drying method in which a rotary kiln is combined with blast furnace gas and a shaft furnace is combined with blast furnace gas, and the examples are the heating and drying method in which microwave and hot exhaust gas are combined. Comparison of tables 1 and 2In the situation, the drying effect is good when the lump ore is dried by adopting the mode of the comparative example, but because the temperature of the heat medium is high, part of the lump ore is cracked, the average particle size is reduced, the flue gas after combustion needs to be discharged outside, and the newly increased flue gas amount is 55-125Nm3T; in comparison with the comparative example, the amount of newly added smoke was 32Nm in example 13The water content of the lump ore is reduced to 4.0 percent from 6.6 percent, and the average particle size is slightly reduced; example 2, the newly added smoke amount was 42Nm3The water content before and after drying is respectively 6.5 percent and 3.1 percent, and the average particle size is slightly reduced; examples 3, 4 and 5 show that the same drying temperature and different drying times have the same effect, the water content is reduced, the average particle size is basically unchanged, and the newly added flue gas amount is respectively 19 Nm, 24 Nm and 44Nm3T; example 6, the newly added amount of smoke was 22Nm3And/t, the water content before and after drying is respectively 4.3 percent and 2.5 percent, and the average particle size is not changed. Therefore, the lump ore after being heated and dried by combining the microwave and the hot waste gas is superior to the comparative example in the aspects of average particle size, drying time, newly increased smoke gas amount and the like, the moisture content of the dried lump ore can completely meet the standard requirement, and the overall effect of heating and drying by combining the microwave and the hot waste gas is superior to that of the existing drying method.
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 (10)
1. The utility model provides a hot waste gas combination of blast furnace lump ore deposit microwave heats drying system which characterized in that: the heating and drying system comprises a chain grate (10), a feeding device and a heating and drying device combination, wherein the feeding device is arranged at the initial end of the chain grate (10) and above the chain grate (10), and the heating and drying device combination is arranged at the middle section of the chain grate (10); the heating and drying device combination comprises a microwave heating device (14), the microwave heating device (14) is arranged above the chain grate machine (10), and a microwave emission port of the microwave heating device (14) faces downwards to the chain grate machine (10); the heating and drying device combination further comprises a hot waste gas blowing device (12), the hot waste gas blowing device (12) is arranged below the chain grate machine (10), and a blowing outlet (13) of the hot waste gas blowing device (12) faces upwards to the chain grate machine (10).
2. The blast furnace lump ore microwave and hot waste gas combined heating and drying system of claim 1, wherein: the feeding device comprises a feeding conveying belt and a roller screen (3), the roller screen (3) is located between the feeding conveying belt and the chain grate (10), the roller screen (3) is inclined downwards, and the downward inclined direction of the roller screen (3) is opposite to the conveying direction of the chain grate (10).
3. The blast furnace lump ore microwave and hot waste gas combined heating and drying system of claim 2, wherein: the feeding conveyor belt comprises a swing conveyor belt (1) and a wide-face conveyor belt (2), the wide-face conveyor belt (2) is located between the swing conveyor belt (1) and the roller screen (3), and the wide-face conveyor belt (2) is located at the tail end of the swing conveyor belt (1).
4. The blast furnace lump ore microwave and hot waste gas combined heating and drying system of claim 1, wherein: a plurality of infrared thermometers (5) are arranged in the microwave heating device (14) from an inlet to an outlet, and the detection ends of the infrared thermometers (5) face the chain grate machine (10); and moisture detectors (4) are arranged at the inlet and the outlet of the heating and drying device combination, and the detection ends of the moisture detectors (4) face the chain grate (10).
5. A blast furnace lump ore microwave and hot waste gas combined heating and drying method based on the blast furnace lump ore microwave and hot waste gas combined heating and drying system of claim 1, characterized in that: the heating and drying method comprises the following steps:
step 1, a feeding device receives blast furnace lump ore (15) transmitted from a previous process, and the feeding device spreads the blast furnace lump ore (15) on a grate (10);
step 2, conveying the blast furnace lump ore (15) into a heating and drying device assembly by a chain grate (10);
and 3, carrying out heating and drying treatment on the blast furnace lump ore (15) on the chain grate (10) by the combination of the heating and drying device, wherein the heating and drying device comprises:
step 3.1, a microwave heating device (14) emits microwave to the blast furnace lump ore (15) on the chain grate (10) for heating and drying;
step 3.2, conveying and blowing external hot waste gas to the chain grate (10) by a hot waste gas blowing device (12), wherein the hot waste gas penetrates through the chain grate (10) to heat and dry the blast furnace lump ore (15);
step 4, the grate (10) conveys the blast furnace lump ore (15) away from the heating and drying device assembly.
6. The blast furnace lump ore microwave and hot waste gas combined heating and drying method according to claim 5, characterized in that: the feeding device comprises a feeding conveyor belt and a roller screen (3), the roller screen (3) is positioned between the feeding conveyor belt and the chain grate (10), the roller screen (3) is inclined downwards, and the downward inclined direction of the roller screen (3) is opposite to the conveying direction of the chain grate (10);
the step 1 comprises the following steps:
1.1, receiving blast furnace lump ores (15) transmitted from a previous process by a feeding conveyor belt, and transmitting the blast furnace lump ores (15) to a roller screen (3) by the feeding conveyor belt;
step 1.2, screening the blast furnace lump ore (15) into two layers according to the granularity by the roller screen (3), and then paving the two layers on the grate (10), wherein the granularity of the upper layer blast furnace lump ore (15) is smaller than that of the lower layer blast furnace lump ore (15).
7. The blast furnace lump ore microwave and hot waste gas combined heating and drying method according to claim 6, characterized in that: the feeding conveyor belt comprises a swing conveyor belt (1) and a wide-face conveyor belt (2), the wide-face conveyor belt (2) is located between the swing conveyor belt (1) and the roller screen (3), and the wide-face conveyor belt (2) is located at the tail end of the swing conveyor belt (1);
the step 1.1 comprises the following steps:
step 1.1.1, a swing conveyor belt (1) receives blast furnace lump ore (15) conveyed from a previous process, and the swing conveyor belt (1) conveys the blast furnace lump ore (15) to a wide-face conveyor belt (2) in a left-right swing mode according to a set conveying speed and a set swing angle;
step 1.1.2, the wide-face conveyor belt (2) conveys the blast furnace lump ore (15) to the roller screen (3).
8. The blast furnace lump ore microwave and hot waste gas combined heating and drying method according to claim 7, characterized in that: said step 1.1.1 further comprises: setting a target paving thickness range of the blast furnace lump ore (15) on the chain grate (10), setting the conveying speed of the swinging conveyor belt (1) as a target conveying speed, and matching the target conveying speed of the swinging conveyor belt (1) with the conveying speed of the chain grate (10) to ensure that the paving thickness of the blast furnace lump ore (15) on the chain grate (10) is within the target paving thickness range; the target paving thickness range of the blast furnace lump ore (15) is set to be 150-400 mm.
9. The blast furnace lump ore microwave and hot waste gas combined heating and drying method according to claim 5, characterized in that: a plurality of infrared thermometers (5) are arranged in the microwave heating device (14) from an inlet to an outlet, and the detection ends of the infrared thermometers (5) face the chain grate machine (10); a moisture detector (4) is arranged at an inlet and an outlet of the heating and drying device combination, and the detection end of the moisture detector (4) faces the chain grate machine (10);
the step 3 further comprises:
and 3.3, controlling and adjusting the microwave emission power of the microwave heating device (14) and the blast flow of the hot waste gas blast device (12) according to the temperature and the moisture content of the blast furnace lump ore (15) detected by the infrared temperature detector (5) and the moisture detector (4).
10. The blast furnace lump ore microwave and hot waste gas combined heating and drying method according to claim 9, characterized in that:
the step 3 further comprises:
and 3.4, controlling and adjusting the running speed of the feeding device and the grate (10) according to the moisture content of the blast furnace lump ore (15) detected by the moisture detector (4).
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Application publication date: 20211217 |