Iron slag sensible heat recycling device

Abstract

This invention proposes a device for recovering and utilizing the sensible heat of iron slag, comprising a collection chamber, a slag pot, a tilting machine, a chute, a cold air jet assembly, a first gravity dust collector, and a waste heat boiler. The tilting machine drives the slag pot to tilt sideways, injecting liquid iron slag into the chute. The outlet of the chute extends into the collection chamber, and the outlet of the cold air jet assembly is located below the chute outlet. The air inlet of the first gravity dust collector is connected to the exhaust port at the top of the collection chamber via a pipeline, and the exhaust port of the first gravity dust collector is connected to the air inlet of the waste heat boiler. This invention, through the cooperation of the cold air jet assembly and the chute, rapidly granulates and cools the liquid iron slag and recovers its sensible heat, significantly improving the sensible heat recovery rate of the liquid iron slag. The first gravity dust collector effectively removes dust generated during the iron slag cooling process, protecting the waste heat boiler. The waste heat boiler converts the recovered sensible heat into high-temperature, high-pressure steam, achieving efficient energy utilization and reducing the overall energy consumption of steel production.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical technology, and in particular to a device for recovering and utilizing the sensible heat of iron slag. Background Technology

[0002] In the steel production process, high-temperature liquid slag (temperatures can reach 1300-1500℃) contains a large amount of sensible heat. Statistics show that the sensible heat of each ton of iron slag is approximately 1.5-2.0 GJ, accounting for 10%-15% of the total energy consumption in steel production. Therefore, it is essential to recover the sensible heat of iron slag.

[0003] Currently, common methods for treating iron slag mainly include water quenching and natural cooling. Water quenching involves directly pouring high-temperature liquid slag into water, utilizing the rapid heat exchange between water and slag to achieve cooling and granulation. Natural cooling involves directly pouring liquid slag into a slag dump, where it is cooled by natural convection and radiation.

[0004] The aforementioned methods have extremely low sensible heat recovery rates, with most of the heat being lost directly through natural cooling or water quenching. This not only wastes energy but also causes environmental pollution. Therefore, developing more efficient and environmentally friendly sensible heat recovery technologies for steel slag is of great significance for energy conservation, emission reduction, and lower production costs. Summary of the Invention

[0005] This invention proposes an iron slag sensible heat recovery and utilization device, which solves the problems of low sensible heat recovery efficiency and environmental pollution in the existing iron slag sensible heat recovery technology.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides an iron slag sensible heat recovery and utilization device, including a collection chamber, a slag pot, a tilting machine, a chute, a cold air injection assembly, a first gravity dust collector, and a waste heat boiler; the tilting machine is used to drive the slag pot to tilt sideways and inject liquid iron slag into the chute, the outlet of the chute extends into the collection chamber, and the outlet of the cold air injection assembly is located below the outlet of the chute; the air inlet of the first gravity dust collector is connected to the exhaust port at the top of the collection chamber through a pipeline, and the exhaust port of the first gravity dust collector is connected to the air inlet of the waste heat boiler.

[0008] This invention utilizes a combination of a cold air jet assembly and a chute to rapidly granulate and cool liquid iron slag while recovering its sensible heat, significantly improving the sensible heat recovery rate of liquid iron slag. A first gravity dust collector effectively filters out dust generated during the cooling process of the steel slag, protecting the waste heat boiler. The recovered sensible heat is then converted into high-temperature, high-pressure steam via the waste heat boiler, achieving efficient energy utilization and reducing the overall energy consumption of steel production.

[0009] Preferably, a rotary kiln is provided below the discharge port at the bottom of the collection chamber. The air inlet of the rotary kiln is connected to a first cold air fan via a pipeline, and the exhaust port of the rotary kiln is connected to the air inlet of a second gravity dust collector via a pipeline. The exhaust port of the second gravity dust collector is connected to the air inlet of the waste heat boiler. The rotary kiln performs secondary heat exchange on the cooled iron slag, fully extracting the remaining sensible heat and improving the overall heat recovery efficiency. The second gravity dust collector further purifies the gas discharged from the rotary kiln, ensuring the safe operation of the boiler.

[0010] Furthermore, a high-temperature chain conveyor is installed below the discharge port. The discharge end of the high-temperature chain conveyor is located above the feed port of the rotary kiln. The high-temperature chain conveyor transports the granulated and cooled iron slag from the collection chamber to the rotary kiln for further cooling, which can prevent the iron slag discharged from the collection chamber from accumulating and sticking at the feed port of the rotary kiln, causing blockage. The iron slag in the collection chamber falls onto the high-temperature chain conveyor and then enters the rotary kiln for secondary cooling. The hot air from the rotary kiln enters the waste heat boiler after passing through the second gravity dust collector.

[0011] Specifically, the cold air injection assembly includes a high-pressure air nozzle and a cooling nozzle installed below the chute outlet. The high-pressure air nozzle is connected to an external air compressor via a pipeline, and the cooling nozzle is connected to an external second cold air blower via a pipeline. The high-pressure air nozzle and the cooling nozzle work together. The high-pressure air nozzle sprays high-pressure air, which can quickly break up the liquid iron slag and achieve rapid granulation of the liquid iron slag. Combined with the cooling air sprayed by the cooling nozzle, the iron slag can be cooled rapidly, shortening the granulation and cooling treatment time of the liquid iron slag and improving production efficiency.

[0012] Preferably, there are two sets of slag pots and tilting machines, which operate in turn to ensure the continuity of iron slag processing and improve production efficiency; and when one set of equipment fails, the other set can continue to work to ensure that production is not affected.

[0013] Preferably, there are two sets of cold air jet components, which operate in turn. This rotation reduces the workload of a single set of equipment and extends its service life. Furthermore, when one set of equipment is under maintenance, the other set can continue to operate without affecting the overall production progress.

[0014] Specifically, the exhaust port of the waste heat boiler is connected to the exhaust stack via a pipeline, and a bag filter is installed on the pipeline connecting the waste heat boiler and the exhaust stack; the bag filter is used to deeply purify the gas discharged from the waste heat boiler to ensure that the dust emission concentration meets environmental protection requirements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the connection structure of an iron slag sensible heat recovery and utilization device according to the present invention;

[0017] In the diagram: 1. Collection chamber; 2. Slag hopper; 3. Tilting machine; 4. Sluice; 5. First gravity dust collector; 6. Waste heat boiler; 7. Rotary kiln; 8. First air cooler; 9. Second gravity dust collector; 10. High-temperature chain conveyor; 11. Feed inlet; 12. High-pressure air nozzle; 13. Cooling nozzle; 14. Air compressor; 15. Second air cooler; 16. Exhaust stack; 17. Baghouse dust collector. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Reference Figure 1 This utility model provides a device for recovering and utilizing the sensible heat of iron slag, including a collection chamber 1, a slag pot 2, a tilting machine 3, a chute 4, a cold air jet assembly, a first gravity dust collector 5, and a waste heat boiler 6; the tilting machine 3 is used to drive the slag pot 2 to tilt sideways and inject liquid steel slag into the chute 4, the outlet of the chute 4 extends into the interior of the collection chamber 1, and the outlet of the cold air jet assembly is located below the outlet of the chute 4; the air inlet of the first gravity dust collector 5 is connected to the exhaust port at the top of the collection chamber 1 through a pipeline, and the exhaust port of the first gravity dust collector 5 is connected to the air inlet of the waste heat boiler 6.

[0020] This invention utilizes the combination of a cold air jet assembly and a chute 4 to rapidly granulate and cool liquid iron slag and recover its sensible heat, significantly improving the sensible heat recovery rate of liquid steel slag. The first gravity dust collector 5 effectively filters out dust generated during the cooling process of the steel slag, reducing air pollution. The waste heat boiler 6 converts the recovered sensible heat into high-temperature and high-pressure steam, achieving efficient energy utilization and reducing the overall energy consumption of steel production.

[0021] In this embodiment, the bottom of the collection chamber 1 is provided with a discharge port for discharging the cooled iron slag, and the top of the collection chamber 1 is provided with an exhaust port for discharging the hot air and dust generated during the cooling process. The slag pot 2 is used to store liquid iron slag, and the tilting machine 3 is used to tilt the slag pot 2 to the side so that the liquid iron slag flows into the chute 4. The chute 4 is used to guide the liquid iron slag into the collection chamber 1 for granulation and cooling. The hot air and dust discharged from the collection chamber 1 enter the first gravity dust collector 5. The dust settles under the action of gravity, and the purified gas enters the waste heat boiler 6. The waste heat boiler 6 converts the heat energy into steam or other forms of energy for use in other production processes.

[0022] Preferably, a rotary kiln 7 is provided below the discharge port at the bottom of the collection chamber 1. The air inlet of the rotary kiln 7 is connected to a first cold air fan 8 through a pipeline, and the exhaust port of the rotary kiln 7 is connected to the air inlet of a second gravity dust collector 9 through a pipeline. The exhaust port of the second gravity dust collector 9 is connected to the air inlet of the waste heat boiler 6. The rotary kiln 7 performs secondary heat exchange on the cooled iron slag to fully extract the remaining sensible heat and improve the overall heat energy recovery efficiency. The second gravity dust collector 9 further purifies the gas discharged from the rotary kiln 7 to ensure that the emissions meet the standards.

[0023] Furthermore, a high-temperature chain conveyor 10 is installed below the discharge port. The discharge end of the high-temperature chain conveyor 10 is located above the feed port 11 of the rotary kiln 7. The iron slag in the collection chamber 1 falls onto the high-temperature chain conveyor 10 and then enters the rotary kiln 7 for secondary cooling. The hot air of the rotary kiln 7 enters the waste heat boiler 6 after passing through the second gravity dust collector 9. The high-temperature chain conveyor 10 transports the granulated and cooled iron slag in the collection chamber 1 to the rotary kiln 7 for further cooling, which can prevent the steel slag discharged from the collection chamber 1 from accumulating and sticking at the feed port 11 of the rotary kiln 7 and causing blockage.

[0024] Specifically, the cold air injection assembly includes a high-pressure air nozzle 12 and a cooling nozzle 13 installed below the outlet of the chute 4. The high-pressure air nozzle 12 is connected to an external air compressor 14 through a pipeline, and the cooling nozzle 13 is connected to an external second cold air fan 15 through a pipeline. The high-pressure air nozzle 12 and the cooling nozzle 13 work together. The high-pressure air nozzle 12 sprays high-pressure air, which can quickly break up the liquid iron slag and achieve rapid granulation of the liquid iron slag. Combined with the cooling air sprayed by the cooling nozzle 13, the iron slag can be cooled quickly, shortening the granulation and cooling treatment time of the liquid iron slag and improving production efficiency.

[0025] In this embodiment, the high-pressure air nozzle 12 and the cooling nozzle 13 spray upwards at an angle, which can better disperse the liquid iron slag flowing out of the chute 4. After being dispersed and cooled, the liquid iron slag moves in a parabolic motion inside the collection chamber 1 and finally falls from the bottom outlet onto the high-temperature chain conveyor 10. This design can make the liquid iron slag granulation more uniform and improve the sensible heat recovery efficiency of the iron slag.

[0026] Preferably, there are two sets of slag pots 2 and tilting machines 3, which operate in turn to ensure the continuity of steel slag processing and improve production efficiency.

[0027] Specifically, the exhaust port of the waste heat boiler 6 is connected to the exhaust stack 16 via a pipeline, and a bag filter 17 is installed on the pipeline connecting the waste heat boiler 6 and the exhaust stack 16. The bag filter 17 performs deep purification on the gas discharged from the waste heat boiler 6 to ensure that the dust emission concentration meets environmental protection requirements. The exhaust stack 16 is used to discharge the gas purified by the bag filter 17 into the atmosphere to ensure that the emission meets the standards.

[0028] In this embodiment, the temperature of the liquid iron slag entering the collection chamber 1 through the chute 4 is 1300~1500℃. After being cooled by the cooling nozzle 13, the temperature of the iron slag drops to 950~1050℃. After being cooled a second time by the rotary kiln 7, the temperature of the steel slag drops to 50~100℃. The temperature of the high-temperature air entering the waste heat boiler 6 is 900~1200℃, and the temperature of the exhaust gas discharged from the waste heat boiler 6 is 50~150℃.

[0029] The working process of the iron slag sensible heat recovery and utilization device in this embodiment is as follows:

[0030] First, the slag pot 2 is tilted to the side by the tilting machine 3. The liquid iron slag flowing out of the slag pot 2 enters the collection chamber 1 through the chute 4 and flows out from the outlet of the chute 4. Then, high-pressure air is sprayed out by the high-pressure air nozzle 12 below the outlet of the chute 4 to break up the liquid iron slag. At the same time, low-temperature air is sprayed out by the cooling nozzle 13 to cool the iron slag. The gas that has fully absorbed the sensible heat of the iron slag in the collection chamber 1 is discharged from the exhaust port and enters the first gravity dust collector 5. The first gravity dust collector 5 removes the dust from the gas. The gas after dust removal enters the waste heat boiler 6 for heat exchange. At the same time, the cooled gas enters the waste heat boiler 6 for heat exchange. Iron slag falls from the discharge port at the bottom of the collection chamber 1 onto the high-temperature chain conveyor 10 below, and is then transported by the high-temperature chain conveyor 10 to the rotary kiln 7 for secondary cooling. After secondary cooling, the iron slag is discharged from the discharge port of the rotary kiln 7. The hot gas discharged from the rotary kiln 7 is filtered by the second gravity dust collector 9 and then enters the waste heat boiler 6 for heat exchange. The waste heat boiler 6 converts the recovered sensible heat into high-temperature and high-pressure steam, achieving efficient energy utilization and reducing the overall energy consumption of steel production. The exhaust gas discharged from the waste heat boiler 6 is then further purified by the bag filter 17 and discharged into the atmosphere through the exhaust stack 16.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for recovering and utilizing the sensible heat of iron slag, characterized in that, The system includes a collection chamber (1), a slag pot (2), a tilting machine (3), a chute (4), a cold air jet assembly, a first gravity dust collector (5), and a waste heat boiler (6). The tilting machine (3) is used to drive the slag pot (2) to tilt sideways and inject liquid iron slag into the chute (4). The outlet of the chute (4) extends into the collection chamber (1), and the outlet of the cold air jet assembly is located below the outlet of the chute (4). The air inlet of the first gravity dust collector (5) is connected to the exhaust port at the top of the collection chamber (1) through a pipeline, and the exhaust port of the first gravity dust collector (5) is connected to the air inlet of the waste heat boiler (6). The discharge port at the bottom of the collection chamber (1) is... A high-temperature chain conveyor (10) is installed below, and the discharge end of the high-temperature chain conveyor (10) is located above the feed inlet (11) of the rotary kiln (7). The air inlet of the rotary kiln (7) is connected to a first cold air fan (8) through a pipeline. The exhaust port of the rotary kiln (7) is connected to the air inlet of a second gravity dust collector (9) through a pipeline. The exhaust port of the second gravity dust collector (9) is connected to the air inlet of the waste heat boiler (6). The iron slag in the collection chamber (1) falls onto the high-temperature chain conveyor (10) and then enters the rotary kiln (7) for secondary cooling. The hot air from the rotary kiln (7) enters the waste heat boiler (6) after passing through the second gravity dust collector (9).

2. The iron slag sensible heat recovery and utilization device as described in claim 1, characterized in that, The cold air jet assembly includes a high-pressure air nozzle (12) and a cooling nozzle (13) installed below the outlet of the chute (4). The high-pressure air nozzle (12) is connected to an external air compressor (14) through a pipeline, and the cooling nozzle (13) is connected to an external second cold air blower (15) through a pipeline.

3. The iron slag sensible heat recovery and utilization device as described in claim 1, characterized in that, The slag pot (2) and the tilting machine (3) are provided in two sets, and the two sets of slag pot (2) and tilting machine (3) are operated in turn.

4. The iron slag sensible heat recovery and utilization device as described in claim 3, characterized in that, The cold air jet assembly is provided in two sets, and the two sets of cold air jet assemblies operate in turn.

5. The iron slag sensible heat recovery and utilization device as described in claim 1, characterized in that, The exhaust port of the waste heat boiler (6) is connected to the exhaust stack (16) through a pipeline, and a bag filter (17) is installed on the pipeline connecting the waste heat boiler (6) and the exhaust stack (16).

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