Movable lump ore drying system and drying operation method

Abstract

The invention discloses a movable lump ore drying system and a drying operation method, and belongs to the technical field of steel smelting raw material pretreatment. The system comprises a feeding hopper, a belt conveyor, a receiving hopper and a control system, and is characterized in that the system adopts a detachable modular design, and each device is fixedly connected to the ground through an embedded steel plate and a bolt and is provided with a hoisting point; the drying device is installed and used during normal production of sintering equipment, and wet sticky lump ore is dried through waste heat of sintered ore. When the sintering equipment is overhauled, the sintering equipment can be quickly detached and lifted away, and the overhauling space is released. The technical problems that after an existing fixed drying system is installed near a sintering circular cooler, space is limited, and equipment overhaul is interfered are solved, flexible compatibility of lump ore drying and sintering equipment maintenance is achieved, and the system has the advantages of being small in occupied area, high in mobility, capable of saving energy, environmentally friendly, intelligent in control and the like.

Description

Technical Field

[0001] This invention relates to the field of raw material pretreatment technology for iron and steel smelting, specifically to a mobile system for drying wet caking ore and its drying operation method. Background Technology

[0002] Lump ore, as a raw material for blast furnaces, is widely used due to its low price. However, wet, sticky lump ore has high moisture content and strong viscosity, which easily leads to incomplete screening and caking in the silo, affecting the permeability of the blast furnace and the smelting intensity. Existing drying methods, such as heating furnace + rotary kiln, vertical shaft furnace drying, and fixed drying systems next to the sintering ring cooler, suffer from problems such as high energy consumption, large footprint, and limited maintenance space. In particular, installing a fixed drying system near the sintering ring cooler will seriously interfere with equipment maintenance, limiting the widespread application of this technology. Moreover, general lump ore drying methods are too complex, not only with high investment costs but also occupying a large space, affecting the regular inspection and maintenance of equipment, and seriously impacting the efficiency of the entire production process.

[0003] The existing patent CN120538292A is a modular heating and gas distribution system that can be deployed and connected relatively flexibly for fixed silos of different locations and sizes, but the main equipment (such as fans and pipes) itself cannot be moved frequently.

[0004] Existing patent CN114370757B integrates the drying function into the existing storage silo, eliminating the need to build a separate, large drying production line. The heat source can be transported via pipelines, thus providing some switching and deployment capabilities between different silos. However, the entire system is still built around a fixed silo and cannot be flexibly disassembled and installed. Summary of the Invention

[0005] The purpose of this invention is to provide a mobile block ore drying system and drying operation method to solve the technical problems of existing drying systems occupying maintenance space and being difficult to disassemble and install flexibly after fixed installation.

[0006] This invention employs a modular and detachable design, fixing each component of the drying system (feeding hopper, belt conveyor, receiving hopper) to the ground using pre-embedded steel plates and bolts, and providing lifting points. During production, it is installed and used to dry lump ore using waste heat from sintered ore; during maintenance, it is disassembled and lifted away, freeing up working space. The system is also equipped with functions such as flow monitoring, vibration anti-sticking, and remote control, enabling intelligent operation.

[0007] The specific technologies are as follows: A mobile lump ore drying system, characterized in that it comprises: Storage unit for receiving and storing wet, caking ore; The feeding unit, connected to the storage unit, is used to introduce wet, sticky lump ore from the storage unit onto the sinter conveying path, so that the lump ore comes into contact with the hot sinter for drying. The transfer unit, which is the hot sinter belt on the surface of the sintering ring cooler or at the outlet of the ring cooler, is used to receive wet lumpy ore and hot sinter transported from the feeding unit. A conveying unit is also provided between the transfer unit and the loading unit, and the equipment in the loading unit and the conveying unit is configured to be detachable. The feeding unit includes a loader and a feeding hopper, and the conveying unit includes a receiving hopper and a feeding belt. The bottom of the feeding hopper is equipped with an adjustable flow valve, and the feeding belt is equipped with a belt scale for measurement. From the feeding hopper to the receiving hopper, the feeding belt is set at an acute angle to the ground.

[0008] Preferably, the bottom outlet of the receiving hopper is 3 to 6 meters above the ground; the bottom outlet of the feeding hopper is 0.5 meters above the ground; and the angle between the feeding belt and the ground from the feeding hopper to the receiving hopper is 5° to 20°.

[0009] Preferably, vibratory motors are installed on the walls of both the feeding hopper and the receiving hopper.

[0010] Preferably, the feeding unit and conveying unit include lifting points set on the equipment and bolted or riveted connection points connected to the ground or pre-embedded steel plates.

[0011] Preferably, the storage unit is a surface storage yard or an underground vehicle receiving tank.

[0012] Preferably, it also includes a monitoring unit, which is a camera installed above the feeding hopper and a data cable for transferring monitoring data to the main control room.

[0013] A drying operation method using a mobile block ore drying system, characterized by comprising the following steps: S1: During normal production of the sintering ring cooler, install and put into operation all the equipment of the mobile lump ore drying system; S2: Start the mobile lump ore drying system, add wet and sticky lump ore to the conveying unit through the feeding unit, monitor the flow rate of wet and sticky lump ore through the belt scale on the feeding belt, and adjust the valve opening to control the feeding speed of the feeding hopper; S3: The wet lumpy ore is conveyed to the receiving hopper by the feeding belt and falls onto the surface of the sintered ore in the third section of the sintering ring cooler or onto the hot sintered ore belt at the outlet of the ring cooler for waste heat drying. The wet lumpy ore stays on the hot sintered ore belt and is dried using the waste heat of the hot sintered ore. S4: When the sintering ring cooler or related equipment needs to be inspected and maintained, stop the wet ore drying operation and move the detachable part or the whole equipment of the movable ore drying system away from the maintenance operation area. S5: After the maintenance work is completed, the moved equipment will be reinstalled and put back in place, and the lump ore drying operation will be restarted as the sintering ring cooler resumes production.

[0014] In step S1, the flow rate of wet lumpy ore obtained by the belt scale is determined by the valve opening of the feeding hopper and the speed of the feeding belt. Q = C × V × W × K, Where Q represents the instantaneous flow rate of the feed belt, C is the load factor of the feed belt (weight of material per unit length), V is the operating speed of the feed belt, W is the effective width of the feed belt, and K is a coefficient that is corrected according to the shape of the feed belt and the material accumulation. K ranges from 0 to 1 and is corrected according to the characteristics of the material on site and the condition of the feed belt.

[0015] When the conveying unit introduces wet, lumpy ore into the sintering ring cooler of the transfer unit or onto the hot sintering conveyor belt at the cooler outlet, the lumpy ore's residence time is 8-10 minutes when the hot sintering conveyor belt is 500-600m long; and 4-5 minutes when the hot sintering conveyor belt is 200-300m long. The advantages of this invention are: 1. Small footprint. In actual operation, this invention only requires 60m² of space. 2 The above-mentioned storage yard (or a truck receiving chute with equivalent storage and loading capacity) and a corridor with a total length of 20m (or the total length of the corner conveyor belt if there is a transfer station) and a width of 1.5m can be achieved.

[0016] 2. Easy to disassemble and assemble. When equipment such as the sintering ring cooler needs maintenance, the lump ore drying operation can be stopped, and the device can be easily moved (or disassembled), which can achieve lump ore drying without affecting the maintenance of the sintering equipment.

[0017] 3. Improve production efficiency: The vibrating motor on the hopper wall can prevent wet and sticky ore from sticking to the inner side of the hopper wall and affecting the feeding speed. It can separate the wet and sticky ore from the hopper side wall as much as possible, avoid the wet and sticky ore from adhering to the hopper side wall and accumulating, thereby affecting the normal feeding and flow rate, and minimize the workload and intensity of manual cleaning of the hopper. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system structure of the present invention; Figure 2 This is a schematic diagram showing the system installation and disassembly status.

[0019] 1-Loader, 2-Feeding hopper, 3-Vibrating motor, 4-Valve, 5-Receiving hopper, 6-Belt scale, 7-Feeding belt, 8-Hot sintered ore belt, 9-Stockyard, 10-Vehicle access road, 11-Isolation wall. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

[0021] like Figure 1 As shown A mobile lump ore drying system, comprising: Storage unit for receiving and storing wet, caking ore; The feeding unit, connected to the storage unit, is used to introduce wet, sticky lump ore from the storage unit onto the sinter conveying path, so that the lump ore comes into contact with the hot sinter for drying. The transfer unit, which is the hot sintered ore belt 8 on the surface of the sintering ring cooler or at the outlet of the ring cooler, is used to receive wet lumpy ore and hot sintered ore transported from the feeding unit. A conveying unit is also provided between the transfer unit and the loading unit, and the equipment in the loading unit and the conveying unit is configured to be detachable. The feeding unit includes a loader 1 and a feeding hopper 2, and the conveying unit includes a receiving hopper 5 and a feeding belt 7. The bottom of the feeding hopper is equipped with an adjustable flow valve 4, and the feeding belt is equipped with a belt scale 6 for metering. From the feeding hopper to the receiving hopper, the feeding belt is set at an acute angle to the ground. The wet lumpy ore is transported by truck through the vehicle access channel 10 and unloaded to the stockpile 9 near the annular cooler.

[0022] Because the sintering ring cooler has a certain height, usually 3 to 6 meters above the ground, and the receiving hopper has a height of 1 to 2 meters, there is a certain height at the junction of the end of the feeding belt and the receiving hopper. The bottom valve of the feeding hopper is only about 0.5 meters above the ground. Therefore, the feeding belt needs to maintain a certain upward tilt angle (5°~20°) to ensure that the lump ore is normally conveyed to the receiving hopper through the isolation wall 11. The maximum tilt angle generally does not exceed 20 degrees, otherwise it will lead to: (1) high energy consumption when the feeding belt is working; (2) the material on the feeding belt may slip and cannot be effectively conveyed.

[0023] Therefore, the bottom outlet of the receiving hopper is set to be 3-6m above the ground; the bottom outlet of the feeding hopper is set to be 0.5m above the ground; and the angle between the feeding belt and the ground from the feeding hopper to the receiving hopper is 5°-20°.

[0024] Vibrating motors 3 are installed on the walls of both the feeding hopper and the receiving hopper.

[0025] The vibrating motor vibrates the side wall of the hopper, causing the wet, sticky ore to separate from the hopper side wall as quickly as possible. This prevents the wet, sticky ore from adhering to the hopper side wall and accumulating, which would affect the normal feeding and flow rate. It also minimizes the workload and intensity of manually cleaning the hopper.

[0026] The feeding unit and conveying unit include lifting points on the equipment and bolt or riveting points connected to the ground or pre-embedded steel plates, which facilitates the removal of the equipment by crane and frees up working space for maintenance operations.

[0027] The storage unit can be a surface storage yard or an underground truck receiving tank.

[0028] Underground truck receiving troughs are a common structure used by steel companies. Materials are unloaded from truck beds into the receiving chamber of the trough. The trough is usually designed with guide plates or ramps to guide the materials to flow smoothly to the conveying equipment, avoiding splashing and accumulation. It can achieve the following: (1) easy unloading of truck beds, saving space; (2) full utilization of underground space for the storage of lump ore, with a large storage capacity.

[0029] The system also includes a monitoring unit, which consists of a camera installed above the feeding hopper and a data cable that transfers the monitoring data to the main control room. By connecting the monitoring screen to the sintering main control room, the system's operating status can be viewed at any time.

[0030] The drying operation method using a mobile lump ore drying system includes the following steps: S1: During normal production of the sintering ring cooler, install and put into operation all the equipment of the mobile lump ore drying system; S2: Start the mobile lump ore drying system, add wet and sticky lump ore to the conveying unit through the feeding unit, monitor the flow rate of wet and sticky lump ore through the belt scale on the feeding belt, and adjust the valve opening to control the feeding speed of the feeding hopper; S3: The wet lumpy ore is conveyed to the receiving hopper by the feeding belt and falls onto the surface of the sintered ore in the third section of the sintering ring cooler or onto the hot sintered ore belt at the outlet of the ring cooler for waste heat drying. The wet lumpy ore stays on the hot sintered ore belt and is dried using the waste heat of the hot sintered ore. S4: When the sintering ring cooler or related equipment needs to be inspected and maintained, stop the wet ore drying operation and move the detachable part or the whole equipment of the movable ore drying system away from the maintenance operation area. S5: After the maintenance work is completed, the moved equipment will be reinstalled and put back in place, and the lump ore drying operation will be restarted as the sintering ring cooler resumes production.

[0031] In step S1, the flow rate of wet lumpy ore obtained by the belt scale is determined by the valve opening of the feeding hopper and the speed of the feeding belt. Q = C × V × W × K, Where Q represents the instantaneous flow rate of the feed belt, C is the load factor of the feed belt (weight of material per unit length), V is the operating speed of the feed belt, W is the effective width of the feed belt, and K is a coefficient that is corrected according to the shape of the feed belt and the material accumulation. K ranges from 0 to 1 and is corrected according to the characteristics of the material on site and the condition of the feed belt.

[0032] When the conveying unit introduces wet, sticky ore into the sintering ring cooler of the transfer unit or the hot sintering conveyor belt at the outlet of the ring cooler, the ore stays in the belt for 8 to 10 minutes when the hot sintering conveyor belt is 500-600m long; and for 4 to 5 minutes when the hot sintering conveyor belt is 200-300m long. Example

[0033] (1) Based on the required amount of lump ore to be dried and its proportion of sinter production, wet lump ore is transported by truck through the vehicle access road and unloaded to the stockpile near the annular cooler. In this embodiment, based on a daily sinter production of 11,500 tons of sinter, the lump ore addition ratio is 15% to 19%. The daily drying volume is 1,725 ​​to 2,185 tons.

[0034] (2) Use a loader to load the ore from the stockpile into the feeding hopper. The bottom of the feeding hopper is equipped with an adjustable flow electric valve, and the height of the upper edge of the feeding hopper is sufficient for the loader to load. The feeding hopper is ≥20m high. 3 Storage capacity ≥ 36t.

[0035] (3) Below the feeding hopper is a feeding belt, which is equipped with a belt scale and a corresponding variable frequency motor, and the belt speed can be adjusted. The wet lumpy ore passes through the end of the feeding belt and enters the receiving hopper, and then enters the hot sintering ore belt through the bottom opening of the receiving hopper.

[0036] (4) Calculate the flow rate of lump ore entering the conveyor belt by measuring the opening degree of the valve at the bottom of the belt scale and the hopper. This data can be collected and connected to the sintering main control room, which will facilitate the relevant operators in the main control room to monitor the flow rate of lump ore in a timely manner. Adjust the opening degree of the hopper valve appropriately according to the flow rate data of lump ore to ensure that the lump ore enters the hot sintering conveyor belt relatively evenly and stably.

[0037] (5) Vibrating motors are installed on the side walls of both the feeding hopper and the receiving hopper to solve the problem that wet and sticky ore may stick to the side walls of the hopper and cannot be discharged smoothly.

[0038] (6) Install a monitoring camera above the feeding hopper and connect the monitoring screen to the sintering main control room so that operators can check whether the feeding hopper is empty at any time.

[0039] (7) The above-mentioned feeding hopper, feeding belt and receiving hopper are all arranged on the pre-embedded steel plate on the ground, and bolts that can be tightened and disassembled are reserved on the steel plate.

[0040] Each of the equipment components is equipped with a lifting point. During normal operation of the sintering production line, these components are bolted onto pre-embedded steel plates and tightened (partially riveted), and the lump ore drying mode is activated. When maintenance is required on the sintering production line, the lump ore drying operation is also stopped, the bolted connections (partial riveting) are disassembled, and the equipment is lifted away by a crane to create working space for maintenance. After maintenance is completed, the lump ore drying components are hoisted back to their original positions, installed and tightened, and the lump ore drying process begins again when the sintering machine is started.

[0041] Table 1. Statistics on the working status and drying volume of the lump ore drying system within one year.

[0042] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0043] The meaning of "and / or" as used in this application includes situations where each exists alone or both exist simultaneously.

[0044] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0045] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A mobile lump ore drying system, characterized in that, include: Storage unit for receiving and storing wet, caking ore; The feeding unit is connected to the storage unit; The transport unit is the hot sintered ore conveyor belt on the surface of the sintering ring cooler or at the outlet of the ring cooler. A conveying unit is also provided between the transfer unit and the loading unit, and the equipment in the loading unit and the conveying unit is configured to be detachable. The feeding unit includes a loader and a feeding hopper, and the conveying unit includes a receiving hopper and a feeding belt. The bottom of the feeding hopper is equipped with an adjustable flow valve, and the feeding belt is equipped with a belt scale for measurement. From the feeding hopper to the receiving hopper, the feeding belt is set at an acute angle to the ground.

2. The mobile lump ore drying system according to claim 1, characterized in that, The bottom outlet of the receiving hopper is 3 to 6 meters above the ground; the bottom outlet of the feeding hopper is 0.5 meters above the ground; and the angle between the feeding belt and the ground from the feeding hopper to the receiving hopper is 5° to 20°.

3. The mobile lump ore drying system according to claim 1, characterized in that, Vibrating motors are installed on the walls of both the feeding hopper and the receiving hopper.

4. The mobile lump ore drying system according to claim 1, characterized in that, The feeding unit and conveying unit include lifting points set on the equipment and bolt or riveting points connected to the ground or pre-embedded steel plates.

5. The mobile lump ore drying system according to claim 1, characterized in that, The storage unit is either a surface storage yard or an underground truck receiving tank.

6. The mobile lump ore drying system according to claim 1, characterized in that, It also includes a monitoring unit, which consists of a camera installed above the feeding hopper and a data cable that transfers the monitoring data to the main control room.

7. A drying operation method based on the movable lump ore drying system according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1: During normal production of the sintering ring cooler, install and put into operation all the equipment of the mobile lump ore drying system; S2: Start the mobile lump ore drying system, add wet and sticky lump ore to the conveying unit through the feeding unit, monitor the flow rate of wet and sticky lump ore through the belt scale on the feeding belt, and adjust the valve opening to control the feeding speed of the feeding hopper; S3: The wet lumpy ore is conveyed to the receiving hopper by the feeding belt and falls onto the surface of the sintered ore in the third section of the sintering ring cooler or onto the hot sintered ore belt at the outlet of the ring cooler for waste heat drying. The wet lumpy ore stays on the hot sintered ore belt and is dried using the waste heat of the hot sintered ore. S4: When the sintering ring cooler or related equipment needs to be inspected and maintained, stop the wet ore drying operation and move the detachable part or the whole equipment of the movable ore drying system away from the maintenance operation area. S5: After the maintenance work is completed, the moved equipment will be reinstalled and put back in place, and the lump ore drying operation will be restarted as the sintering ring cooler resumes production.

8. The drying operation method of the mobile lump ore drying system according to claim 7, characterized in that, In step S1, the flow rate of wet lumpy ore obtained by the belt scale is determined by the valve opening of the feeding hopper and the speed of the feeding belt. Q = C × V × W × K, Where Q represents the instantaneous flow rate of the feed belt, C is the load factor of the feed belt (weight of material per unit length), V is the operating speed of the feed belt, W is the effective width of the feed belt, and K is a coefficient that is corrected according to the shape of the feed belt and the material accumulation. K ranges from 0 to 1 and is corrected according to the characteristics of the material on site and the condition of the feed belt.

9. The drying operation method of the mobile lump ore drying system according to claim 7, characterized in that, When the conveying unit introduces wet, sticky ore into the sintering ring cooler of the transfer unit or the hot sintering conveyor belt at the outlet of the ring cooler, the ore stays in the belt for 8 to 10 minutes when the hot sintering conveyor belt is 500-600m long; and for 4 to 5 minutes when the hot sintering conveyor belt is 200-300m long.

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