Slag flow control device and method for realizing continuous wind quenching and granulation of steel slag in multiple furnaces

Abstract

The present invention discloses a slag flow control device and method for realizing continuous wind quenching and granulation of steel slag in multiple furnaces, comprising a platform frame, a slag pot containing molten steel slag and a PLC controller, wherein a combined double-tank slag pot tilting platform for alternately receiving slag pots is provided on the platform frame, and a slag pot tilting mechanism for driving two slag pots to alternately tilt is provided on the combined double-tank slag pot tilting platform; a track is provided below one side of the combined double-tank slag pot tilting platform, a tundish car is provided on the track, and two dam overflow type tundishes are provided on the tundish car; a swinging liquid slag guide trough that can swing between the two slag pots is obliquely provided between the dam overflow type tundish and the slag pot; a wind quenching nozzle is provided below the track; and the output end of the PLC controller is respectively connected to the slag pot tilting mechanism, the swinging liquid slag guide trough and the controlled end of the tundish car. The present invention can improve the comprehensive efficiency of the steel slag wind quenching granulation and heat recovery system.

Description

Technical Field

[0001] The present invention relates to the technical field of steel slag waste heat recovery and resource utilization, and in particular to a process slag flow control device and method for realizing continuous wind quenching and granulation of steel slag in multiple furnaces. Background Art

[0002] Molten steel slag is a by-product of the steelmaking process. Each time a furnace of molten steel is smelted, slag accounting for about 10% of the molten steel is produced. Each furnace of molten steel and liquid slag are poured into a ladle and a slag pot respectively. The smelting process has a clear rhythmic periodicity. Molten steel slag has a large annual output and high temperature. It is a high-quality waste heat resource that has not been recycled. In the past research and development of slag waste heat recovery technology at home and abroad, although the composition of slag is complex and the physical properties are different, they almost encountered the same bottleneck problem, that is, the comprehensive efficiency of the recovery system is low, and the energy efficiency index directly restricts the industrial application of waste heat recovery technology.

[0003] In the actual application of the current steel slag by-product treatment process, "Technical Specification for Steel Slag Treatment Process" (GB / T29514-2018) and "Technical Standard for Steel Slag Treatment and Comprehensive Utilization (GB / T51387-2019)" are both technical recommendations for feasible treatment processes and technical specifications for related professions to accelerate the development of the steel slag comprehensive utilization industry. Among them, the molten steel slag tank type pressurized hot stuffy process, through the heat exchange between steel slag and water, although water vapor of a certain temperature and pressure is produced, due to the direct contact between water and steel slag, the steam carries dust with unstable content and is very easy to cause surface hardening of the equipment. The steam source gathered in multiple pressurized hot stuffy tanks makes the temperature and pressure of the steam extremely unstable, so it is difficult to use. At present, production enterprises basically release it into the air.

[0004] The dry air quenching granulation process of molten steel slag is considered to be an essential process for achieving waste heat recovery. The steel slag first needs to be granulated into particles that are as small and uniform as possible, and then a suitable heat exchange medium is used to fully exchange heat with the steel slag. Through multiple heat exchange methods such as radiation, convection, and conduction, the maximum recovery of the sensible heat of the steel slag can be achieved.

[0005] At the same time, due to the periodic and rhythmic production characteristics of steelmaking, the process flow of the system must also consider the contradiction between the intermittent slag discharge and the continuity of heat utilization. For the treatment process of a single tank of slag, when each tank is produced, the system equipment needs to be started and stopped, the heat source is intermittently supplied, the system equipment is alternately hot and cold, and each tank will produce slag loss, thus reducing the operating rate of the system equipment and the slag air quenching ratio, greatly limiting the improvement of the overall efficiency of the system. In the field of metallurgical manufacturing, the multi-furnace continuous steel casting process of molten steel, namely continuous casting technology, has been very mature after years of research and development, and has significantly improved the economic and technical indicators of the steelmaking process, but no research has been found on the multi-furnace continuous treatment technology of steelmaking slag, especially the multi-furnace continuous production technology for slag air quenching granulation and waste heat recovery process. In order to realize the industrial utilization of slag waste heat resources as soon as possible, it is very urgent to research and develop a system for realizing multi-furnace slag continuous air quenching granulation. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a process slag flow control device and method for realizing continuous air quenching and granulation of steel slag in multiple furnaces, so as to improve the comprehensive efficiency of the steel slag air quenching and granulation and heat recovery system.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0008] The invention discloses a slag flow control device and method for realizing continuous wind quenching and granulation of steel slag in multiple furnaces, comprising a platform frame, a slag pot containing molten steel slag and a PLC controller, wherein the platform frame is provided with a combined double-tank slag pot tilting platform for alternately receiving slag pots, and the combined double-tank slag pot tilting platform is provided with a slag pot tilting mechanism for driving two slag pots on the double positions to alternately tilt; a track parallel to the combined double-tank slag pot tilting platform is provided at the lower side of one side of the combined double-tank slag pot tilting platform, a tundish car running on the track is provided on the track, and the tundish Two dam-overflow type tundishes are arranged on the vehicle along the traveling direction of the tundish car for improving the flow conditions of the slag liquid dumped out of the slag pot; a swinging liquid-slag guide trough is obliquely arranged between the dam-overflow type tundish and the slag pot, which can swing between the two slag pots and is used to guide the slag liquid dumped out of the slag pot into the dam-overflow type tundish; an air quenching nozzle is arranged below the track for air quenching and granulating the slag liquid discharged from the dam-overflow type tundish; the output end of the PLC controller is respectively connected to the slag pot tilting mechanism, the swinging liquid-slag guide trough and the controlled end of the tundish car.

[0009] Preferably, the inclination angle of the swing-type liquid-slag guide trough is greater than 30°.

[0010] Preferably, an emergency slag pot is provided below the swinging liquid-slag guide trough for receiving splashing of slag and liquid during the tipping process of the slag pot and overflow of slag flow in the dam overflow type tundish.

[0011] Preferably, the platform frame includes three working space areas arranged in a stepped form, namely a slag pot tilting operation platform, a slag flow emergency treatment channel and a tundish rapid replacement operation platform; the combined double-tank slag pot tilting platform is arranged on the slag pot tilting operation platform, the accident slag pot is arranged on the slag flow emergency treatment channel, the track and the swinging liquid slag guide trough are both arranged on the tundish rapid replacement operation platform, and the air quenching nozzle is arranged at the lower part of the tundish rapid replacement operation platform.

[0012] Preferably, the interior of the dam overflow type ladle is provided with an upper slag retaining wall and a lower slag retaining wall alternately arranged along the flow direction of the slag flow inertia, for changing the direction of the slag flow and blocking the solid slag masses in the slag flow; an overflow port for discharging the solid slag masses into the accident slag pot is arranged above the rear wall of the dam overflow type ladle; a sizing flow nozzle for discharging the slag liquid is arranged below the front wall of the dam overflow type ladle.

[0013] Preferably, the horizontal distance between the upper slag retaining wall and the lower slag retaining wall is 150-200 cm, and the height of the overflow port is 150-200 cm higher than the top of the lower slag retaining wall.

[0014] The method for controlling slag flow during continuous wind quenching and granulation of steel slag in multiple furnaces comprises the following steps:

[0015] The combined double-tank slag pot tilting table alternately receives slag pots containing molten steel slag. The slag pots are alternately tilted to pour the slag liquid into the swinging liquid-slag diversion trough. The slag flow flows rapidly and flows into the dam overflow type tundish through the swinging liquid-slag diversion trough. The slag liquid entering the dam overflow type tundish is blocked and buffered by the dam inside the dam overflow type tundish and then discharged from the sizing flow nozzle at its front end to be wind-quenched and granulated.

[0016] Preferably, the solid slag masses carried by the slag flow in the dam-overflow type tundish are discharged into an accident slag pot arranged in the slag flow emergency treatment channel area through the overflow port of the dam-overflow type tundish.

[0017] Preferably, the dam overflow type tundish after the first multi-furnace continuous air quenching can be quickly replaced according to the slag removal effect of the dam overflow, and then cycled into the next multi-furnace continuous air quenching operation.

[0018] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0019] The present invention can realize slag flow control during continuous wind quenching and granulation of steel slag in multiple furnaces by means of the combined double-tank slag pot tilting platform, swinging liquid slag diversion trough, dam overflow type tundish, tundish car, track and accident slag pot, thereby improving the comprehensive efficiency of the steel slag wind quenching granulation and heat recovery system; by setting up three operating space areas according to the operation and maintenance characteristics of the device, namely, a slag pot tilting operation platform, a tundish quick replacement operation platform and a slag flow emergency treatment channel, and taking into account the platform frame for the arrangement and installation of the wind quenching nozzles, it can maximize production safety, reduce mutual interference between different operations, and achieve high-efficiency continuous operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A top view of the present invention;

[0021] Figure 2 It is a side view of the present invention.

[0022] Among them: 1. Platform frame, 11. Slag pot tipping operation platform, 12. Tundish quick replacement operation platform, 13. Slag flow emergency treatment channel, 2. Slag pot, 3. Combined double-position slag pot tipping platform, 4. Swinging liquid slag diversion trough, 5. Dam overflow type tundish, 51. Upper slag retaining wall, 52. Lower slag retaining wall, 53. Overflow port, 54. Fixed-size flow nozzle, 6. Tundish car, 7. Track, 8. Accident slag pot, 9. Air quenching nozzle. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] A slag flow control device and method for realizing continuous wind quenching and granulation of steel slag in multiple furnaces, combined with Figure 1 to Figure 2 As shown, it includes a platform frame 1, a combined double-tank slag pot tilting platform 3, a swinging liquid slag diversion trough 4, a dam-blocking overflow type tundish 5, a tundish car 6, a track 7 and an accident slag pot 8, wherein the combined double-tank slag pot tilting platform 3, the swinging liquid slag diversion trough 4, the dam-blocking overflow type tundish 5, the tundish car 6, the track 7 and the accident slag pot 8 are mainly arranged in a stepped form through the platform frame 1, so that the liquid slag flow can achieve rapid flow depending on the height difference of the equipment position.

[0025] The platform frame 1 includes three working space areas, namely a slag pot tilting operation platform 11, a tundish quick replacement operation platform 12 and a slag flow emergency processing channel 13. The three working space areas are arranged in a stepped form. Specifically, the slag pot tilting operation platform 11 is higher than the tundish quick replacement operation platform 12, and the slag flow emergency processing channel 13 is located between the slag pot tilting operation platform 11 and the tundish quick replacement operation platform 12 and is lower than the tundish quick replacement operation platform 12.

[0026] The combined double-tank slag pot tilting platform 3 is arranged on the slag pot tilting operation platform 11, and the combined double-tank slag pot tilting platform 3 is used to alternately receive the slag pot 2 containing molten steel slag. A slag pot tilting mechanism is arranged on the combined double-tank slag pot tilting platform 3, and the slag pot tilting mechanism is used to drive the two slag pots 2 on the double tank positions to alternately tilt. The slag pot tilting mechanism is a prior art, and its specific structure is not repeated here.

[0027] The track 7 and the swing-type liquid-slag guide trough 4 are both arranged on the tundish quick-change operation platform 12 .

[0028] The track 7 is arranged below one side of the combined double-tank slag pot tilting platform 3 through the tundish quick-change operation platform 12, and the track 7 is arranged parallel to the combined double-tank slag pot tilting platform 3. The tundish car 6 travels on the track 7. There are two dam overflow type tundishes 5, both of which are arranged on the tundish car 6 and along the travel direction of the tundish car 6.

[0029] There is one swinging liquid slag guide trough 4, which is tilted between the slag pot 2 and the dam overflow type tundish 5 and can swing between the two slag pots 2. The tilt angle of the swinging liquid slag guide trough 4 is greater than 30°, so as to realize the rapid flow of slag flow and solid slag mass, reduce the amount of steel slag adhesion, and guide the slag liquid dumped out of the slag pot 2 into the dam overflow type tundish 5 located at the outlet of the swinging liquid slag guide trough 4. The specific structure of the swinging liquid slag guide trough 4 is not limited here, and can be composed of a guide trough and a driving mechanism, wherein the guide trough is tilted between the slag pot 2 and the dam overflow type tundish 5; the driving mechanism is used to drive the guide trough to swing, and can be a telescopic cylinder, a motor, etc.

[0030] The two dam overflow type tundishes 5 travel on the track 7 through the tundish car 6, so as to be alternately located at the outlet of the swing type liquid slag guide channel 4. The dam overflow type tundish 5 is used to improve the flow condition of the slag liquid dumped out of the slag pot 2.

[0031] The dam-overflow type tundish 5 comprises an upper slag retaining wall 51 , a lower slag retaining wall 52 , an overflow port 53 and a sizing nozzle 54 .

[0032] The upper slag retaining wall 51 and the lower slag retaining wall 52 are each one, wherein the upper slag retaining wall 51 is arranged above the interior of the dam overflow type tundish 5, the top of the upper slag retaining wall 51 is vertically connected to the top wall of the dam overflow type tundish 5, and the two ends of the upper slag retaining wall 51 are vertically connected to the side walls of the dam overflow type tundish 5; the lower slag retaining wall 52 is arranged below the interior of the dam overflow type tundish 5, the bottom of the lower slag retaining wall 52 is vertically connected to the bottom wall of the dam overflow type tundish 5, and the two ends of the lower slag retaining wall 52 are vertically connected to the side walls of the dam overflow type tundish 5; the upper slag retaining wall 51 and the lower slag retaining wall 52 are staggered along the flow direction of the slag flow inertia. The horizontal distance between the upper slag retaining wall 51 and the lower slag retaining wall 52 is 150~200cm, and the lower edge of the upper slag retaining wall 51 is basically the same height as the top of the lower slag retaining wall 52. The upper slag retaining wall 51 and the lower slag retaining wall 52 change the direction of the slag flow in the form of a dam, thereby blocking the solid slag mass in the slag flow. At the same time, the slag liquid buffered in the dam overflow type tundish 5 stabilizes the slag flow.

[0033] The overflow port 53 is arranged above the rear wall of the dam overflow type tundish 5, the number of the overflow ports 53 is 1-2, the height of the overflow port 53 is 150-200 cm higher than the top of the lower slag retaining wall 52, and the total width of the overflow port 53 is about half the width of the rear wall of the dam overflow type tundish 5. When the solid slag mass blocked by the upper slag retaining wall 51 and the lower slag retaining wall 52 gathers to a certain height in the dam overflow type tundish 5, it is discharged through the overflow port 53 under the action of the slag flow surge, thereby reducing the interference with the slag flow velocity field in the dam overflow type tundish 5.

[0034] The sizing nozzle 54 is arranged below the front wall of the dam overflow type tundish 5, and is used to discharge the slag liquid. The lower part of the tundish quick replacement operation platform 12 is provided with an air quenching nozzle 9, and is used to granulate the slag liquid discharged from the sizing nozzle 54 by air quenching.

[0035] In order to ensure the safety of the process slag flow control operation, the accident slag pot 8 is arranged on the slag flow emergency treatment channel 13 and is located below the swing-type liquid slag diversion trough 4. The accident slag pot 8 is used to receive the slag liquid splashing during the tipping process of the slag pot 2, the slag flow overflow in the dam overflow type tundish 5, and the solid slag mass discharged from the overflow port 53. In order to facilitate the hoisting of the accident slag pot 8, the extreme position of the swing-type liquid slag diversion trough 4 can be far away from the upper area of ​​the accident slag pot 8. At this time, the upper space of the slag flow emergency treatment channel 13 is conducive to the hoisting operation of the accident slag pot 8.

[0036] The device also includes a PLC controller, which is used to realize the operation control of the device. The output end of the PLC controller is connected to the controlled end of the slag pot tilting mechanism, the swinging liquid slag diversion trough 4 and the tundish car 6 respectively. The PLC controller controls the swinging operation of the swinging liquid slag diversion trough 4 to realize the automatic swinging of the swinging liquid slag diversion trough 4 through the controlled end of the swinging liquid slag diversion trough 4 interlocking with the slag pot tilting mechanism; the PLC controller realizes the replacement of the dam overflow type tundish 5 located at the outlet of the swinging liquid slag diversion trough 4 by driving the tundish car 6.

[0037] A slag flow control method for realizing continuous wind quenching and granulation of steel slag in multiple furnaces, comprising the following steps:

[0038] The combined double-tank slag pot tilting table 3 alternately receives the slag pot 2 containing molten steel slag, and the slag pot 2 is alternately tilted to pour the slag liquid into the swinging liquid-slag diversion channel 4. The slag flow flows rapidly and flows into the dam overflow type ladle 5 through the swinging liquid-slag diversion channel 4. The slag liquid entering the dam overflow type ladle 5 is blocked and buffered by the dam inside the dam overflow type ladle 5, and then discharged from the sizing flow nozzle 54 at its front end to be wind-quenched and granulated.

[0039] In the above process, the solid slag mass carried by the slag flow in the dam overflow type tundish 5 is discharged into the accident slag pot 8 arranged in the slag flow emergency treatment channel 13 through the overflow port 53 of the dam overflow type tundish 5. After the first multi-furnace continuous wind quenching, the dam overflow type tundish 5 can be quickly replaced according to the slag discharge effect of its dam overflow, and then circulate to enter the next multi-furnace continuous wind quenching operation.

[0040] The present invention can realize the slag flow control during the continuous wind quenching and granulation of steel slag in multiple furnaces by providing a combined double-tank slag pot tilting platform 3, a swinging liquid slag diversion trough 4, a dam overflow type tundish 5, a tundish car 6, a track 7 and an emergency slag pot 8, thereby improving the comprehensive efficiency of the steel slag wind quenching and granulation and heat recovery system; by providing three operating space areas, namely a slag pot tilting operation platform 11, a tundish quick replacement operation platform 12 and a slag flow emergency treatment channel 13 according to the operation and maintenance characteristics of the device, and taking into account the arrangement and installation of the wind quenching nozzle 9, a platform frame 1 can be provided to maximize production safety, reduce mutual interference between different operations, and achieve high-efficiency continuous operation.

Claims

1. A slag flow control device for realizing continuous wind quenching and granulation of steel slag in multiple furnaces, comprising a platform frame (1), a slag pot (2) containing molten steel slag, and a PLC controller, characterized in that: The platform frame (1) is provided with a combined double-tank position slag pot tilting platform (3) for alternately receiving slag pots (2); the combined double-tank position slag pot tilting platform (3) is provided with a slag pot tilting mechanism for driving two slag pots (2) on the double tank positions to alternately tilt; a track (7) arranged parallel to the combined double-tank position slag pot tilting platform (3) is arranged below one side of the combined double-tank position slag pot tilting platform (3); a tundish car (6) running on the track (7) is arranged on the track (7); two dam overflow type tundishes (5) for improving the flow conditions of slag liquid tilted out of the slag pot (2) are arranged on the tundish car (6) along the running direction of the tundish car (6); a slanting device that can swing between the two slag pots (2) and is used to transfer slag liquid to the slag pot (2) is arranged between the dam overflow type tundish (5) and the slag pot (2) The slag liquid tipped out of the tank (2) is guided into a swing-type liquid-slag guide trough (4) in a dam-overflow type tundish (5); a wind quenching nozzle (9) for wind-quenching and granulating the slag liquid discharged from the dam-overflow type tundish (5) is arranged below the track (7); an accident slag tank (8) for receiving slag liquid splashing during the tipping process of the slag tank (2) and slag flow overflow in the dam-overflow type tundish (5) is arranged below the swing-type liquid-slag guide trough (4); the platform frame (1) comprises three operating space areas arranged in a stepped form, namely a slag tank tipping operation platform (11), a slag flow emergency treatment channel (13) and a tundish quick replacement operation platform (12); the output end of the PLC controller is respectively connected to the slag tank tipping mechanism, the swing-type liquid-slag guide trough (4) and the controlled end of the tundish car (6).

2. The slag flow control device for realizing multi-furnace continuous wind quenching and granulation of steel slag according to claim 1, characterized in that: The inclination angle of the swing-type liquid-slag guide trough (4) is greater than 30°.

3. The slag flow control device for realizing multi-furnace continuous wind quenching and granulation of steel slag according to claim 1, characterized in that: The combined double-tank position slag pot tilting platform (3) is arranged on the slag pot tilting operation platform (11), the accident slag pot (8) is arranged on the slag flow emergency treatment channel (13), the track (7) and the swing-type liquid slag guide groove (4) are both arranged on the tundish quick replacement operation platform (12), and the air quenching nozzle (9) is arranged at the bottom of the tundish quick replacement operation platform (12).

4. The slag flow control device for realizing multi-furnace continuous wind quenching and granulation of steel slag according to claim 1, characterized in that: An upper slag retaining wall (51) and a lower slag retaining wall (52) are staggeredly arranged inside the dam overflow type tundish (5) along the inertial flow direction of the slag flow, and are used to change the direction of the slag flow and to block solid slag lumps in the slag flow; an overflow port (53) is arranged above the rear wall of the dam overflow type tundish (5) for discharging solid slag lumps into an accident slag pot (8); and a sizing nozzle (54) is arranged below the front wall of the dam overflow type tundish (5) for discharging slag liquid.

5. The slag flow control device for realizing multi-furnace continuous wind quenching and granulation of steel slag according to claim 4, characterized in that: The horizontal distance between the upper slag retaining wall (51) and the lower slag retaining wall (52) is 150 to 200 cm, and the height of the overflow port (53) is 150 to 200 cm higher than the top of the lower slag retaining wall (52).

6. The slag flow control method for realizing multi-furnace continuous quenching and granulation of steel slag according to any one of claims 1 to 5, characterized in that: The following steps are involved: The combined double-tank slag pot tilting platform (3) alternately receives the slag pot (2) containing molten steel slag, and the slag pot (2) is alternately tilted to pour the slag liquid into the swing-type liquid-slag diversion trough (4), and the slag flow flows rapidly and flows into the dam overflow type tundish (5) through the swing-type liquid-slag diversion trough (4); the slag liquid entering the dam overflow type tundish (5) is blocked and buffered by the dam inside the dam overflow type tundish (5), and then discharged from the sizing flow nozzle (54) at the front end thereof to be wind-quenched and granulated.

7. The slag flow control method for realizing multi-furnace continuous wind quenching and granulation of steel slag according to claim 6, characterized in that: The solid slag mass carried by the slag flow in the dam-overflow type tundish (5) is discharged through the overflow port (53) of the dam-overflow type tundish (5) into an accident slag tank (8) arranged in the area of ​​the slag flow emergency treatment channel (13).

8. The slag flow control method for realizing multi-furnace continuous wind quenching and granulation of steel slag according to claim 6, characterized in that: After the first multi-furnace continuous wind quenching, the dam overflow type tundish (5) is quickly replaced according to the slag removal effect of the dam overflow, and then circulated to enter the next multi-furnace continuous wind quenching operation.

Images