Waste heat recovery system applied to combination of granulation and crushing of metallurgical high-temperature slag

Abstract

The invention discloses a waste heat recovery system applied to metallurgical high-temperature slag granulation and crushing combination. The waste heat recovery system comprises a material treatment module, a waste heat recovery treatment module and a dry dust removal module, and the waste heat recovery treatment module and the dry dust removal module are connected with the material treatment module; the material processing module comprises a rolling crushing assembly, an air quenching granulation assembly, a conveying assembly and a rotary heat exchanger; a rolling crushing process and an air quenching granulation process are combined, molten slag, semi-molten slag and solid slag can be crushed at the same time, the crushing efficiency of the high-temperature slag is effectively improved, meanwhile, waste heat in the crushing process is recycled and utilized through cooperation of a steam pocket, a rotary heat exchanger and a membrane wall structure, and in addition, the energy consumption is reduced. In the rolling and crushing process, a large amount of water fetching treatment is not carried out, so that secondary sewage sludge caused by wet washing is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical equipment, and in particular to a waste heat recovery system applied to a metallurgical high-temperature slag granulation and crushing combination. Background Art

[0002] In the production process of the metallurgical industry, there is a large amount of high-temperature slag that needs to be crushed and cooled. Due to production and transportation restrictions, when the molten slag is sent to the processing workshop, the slag is partially cooled and presents a multi-phase coexistence state of slag, semi-molten or even solid.

[0003] Taking steelmaking slag as an example, the more advanced treatment processes at present are the rolling hot stuffing process and the wind quenching process. Among them, the rolling hot stuffing process is widely used in steel enterprises because it can adapt to various forms from liquid to solid. However, this process does not achieve effective waste heat recovery in the rolling and hot stuffing stages, and the rolling process requires water treatment. The rolling and crushing process will not only produce a large amount of smoke and dust, but also cause secondary sewage sludge pollution after wet washing. In addition, mechanical rolling and crushing is relatively extensive. After rolling and hot stuffing, a cumbersome crushing and screening process is still required, which requires a long subsequent process and energy consumption.

[0004] The wind quenching process is a process that uses high-speed gas to crush the slag. It can crush the slag to 1-3mm at one time. It is currently the fastest and most efficient pretreatment process, but this process is only suitable for liquid slag, and cannot be applied to semi-molten and solid slag, which accounts for 30-40% of steel slag and still requires other processes to cooperate with. In addition, the wind quenching process is limited to blowing and landing in free space, without any waste heat recovery, and the heat resources are also not recycled. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination, which can combine the rolling crushing process and the wind quenching granulation process to crush the high-temperature slag and recover the waste heat in the crushing process.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0007] A waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination includes a material processing module, a waste heat recovery processing module, and a dry dust removal module. The waste heat recovery processing module and the dry dust removal module are respectively connected to the material processing module; the material processing module includes a rolling and crushing component, an air quenching granulation component, a transmission component and a rotary heat exchanger; the waste heat recovery processing module includes a steam drum, and the steam is transported through a steam transport pipeline; the dry dust removal module includes a dry bag dust collector, one end of the dry bag dust collector is connected to the main dust removal pipeline, and the other end is connected to the chimney through an air supply pipeline, and an induced draft fan is arranged on the air supply pipeline.

[0008] The above-mentioned waste heat recovery system applied to the granulation and crushing combination of metallurgical high-temperature slag, the rolling and crushing assembly includes a slag pot tilting mechanism, a rolling chamber, a rolling bed is arranged at the bottom of the rolling chamber, a rolling crusher is also arranged above the rolling bed, and a first drop hopper is arranged at the bottom of the rolling bed.

[0009] The above-mentioned waste heat recovery system applied to metallurgical high-temperature slag granulation and crushing combination, the rolling chamber adopts a membrane wall structure, one end of the steam drum is connected to the water inlet of the membrane wall structure through a second water inlet pipe, and the other side of the steam drum is connected to the water outlet of the membrane wall structure through a second water outlet pipe.

[0010] The above-mentioned waste heat recovery system applied to metallurgical high-temperature slag granulation and crushing combination, the rolling chamber is connected to the main dust removal pipeline through a first dust removal branch pipe, and the first dust removal branch pipe is provided with a first dust removal regulating valve.

[0011] The above-mentioned waste heat recovery system applied to the metallurgical high-temperature slag granulation and crushing combination, the air quenching granulation component includes an air quenching granulation chamber, a slag pot tilting mechanism, a slag chute, an air quenching fan, and an air quenching nozzle. The air quenching nozzle is located below the slag chute and connected to the air quenching fan, and the nozzle of the air quenching nozzle is inclined toward the air quenching granulation chamber.

[0012] The above-mentioned waste heat recovery system applied to metallurgical high-temperature slag granulation and crushing combination, the air quenching granulation chamber adopts a membrane wall structure, the steam drum is connected to the water inlet of the membrane wall structure through the third water inlet pipe, and the other side of the steam drum is connected to the water outlet of the membrane wall structure through the third water outlet pipe.

[0013] The above-mentioned waste heat recovery system applied to metallurgical high-temperature slag granulation and crushing combination, the wind quenching granulation chamber is connected to the main dust removal pipeline through the second dust removal branch pipe, and the second dust removal regulating valve is arranged on the second dust removal branch pipe.

[0014] The above waste heat recovery system applied to the metallurgical high-temperature slag granulation and crushing combination, the transmission component includes a high-temperature conveyor, and the high-temperature conveyor is connected to the feed port of the rotary heat exchanger.

[0015] The above-mentioned waste heat recovery system applied to metallurgical high-temperature slag granulation and crushing combination, the steam drum is connected to the water inlet of the rotary heat exchanger through the first water inlet pipe, the steam drum is connected to the water outlet of the rotary heat exchanger through the first water outlet pipe, and a circulating pump is arranged on the first water inlet pipe.

[0016] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0017] The present invention provides a waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination. The system combines the rolling crushing process with the wind quenching granulation process, and can simultaneously crush molten, semi-molten and solid slags, thereby effectively improving the crushing efficiency of the high-temperature slag. At the same time, the waste heat in the crushing process is recovered and utilized through the cooperation of the steam drum, the rotary heat exchanger and the membrane wall structure. Moreover, the rolling crushing process does not require a large amount of water treatment, thereby reducing the generation of secondary sewage sludge caused by wet washing. The present invention adopts a dry bag dust collector to effectively recover and treat the smoke generated in the crushing process, thereby reducing the emission of environmental pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the specific structure of material transportation and waste heat recovery of the present invention; Figure 2 It is a schematic diagram of the specific structure of smoke treatment of the present invention.

[0019] Among them: 1. Slag pot tipping mechanism, 2. Rolling crusher, 3. Rolling chamber, 4. Rolling bed, 5. Slag chute, 6. Air quenching fan, 7. Air quenching nozzle, 8. Air quenching granulation chamber, 9. High temperature conveyor, 10. Rotary heat exchanger, 11. First water inlet pipe, 12. Circulation pump, 13. First water outlet pipe, 14. Steam drum, 15. Steam delivery pipeline, 16. First drop hopper, 17. Second drop hopper, 18. First water outlet pipe, 19. Second water inlet pipe, 20. Third water inlet pipe, 21. Third water outlet pipe, 22. First dust removal branch pipe, 23. First dust removal regulating valve, 24. Second dust removal branch pipe, 25. Second dust removal regulating valve, 26. Main dust removal pipeline, 27. Dry bag dust collector, 28. induced draft fan, 29. Chimney. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Waste heat recovery system used in metallurgical high temperature slag granulation and crushing combination, such as Figure 1 to Figure 2 As shown, it includes a material processing module, a waste heat recovery processing module, and a dry dust removal module, and the waste heat recovery processing module and the dry dust removal module are respectively connected to the material processing module.

[0022] The material processing module includes a rolling and crushing component, an air quenching and granulation component, a conveying component and a rotary heat exchanger 10. The rolling and crushing component is mainly used to crush semi-molten and solid slag with poor fluidity. The air quenching and granulation component is mainly used to process molten slag with good fluidity. The conveying component is mainly used to transport the steel slag after rolling and crushing or air quenching and granulation. The rotary heat exchanger 10 is mainly used to recover the heat of the high-temperature steel slag.

[0023] The rolling and crushing assembly includes a slag pot tilting mechanism 1 and a rolling chamber 3. A rolling bed 4 is arranged at the bottom of the rolling chamber 3. A rolling crusher 2 is also arranged above the rolling bed 4 in the rolling chamber 3. A first drop hopper 16 is arranged at the bottom of the rolling bed 4.

[0024] The slag pot tilting mechanism 1 delivers the semi-molten and solid slag into the rolling chamber 3, and the slag on the rolling bed 4 is rolled and crushed by the rolling crusher 2. The rolled slag is delivered to the conveying assembly through the first dropping hopper 16 for transportation.

[0025] The air quenching granulation assembly includes an air quenching granulation chamber 8, a slag pot tilting mechanism 1, a slag chute 5, an air quenching fan 6, and an air quenching nozzle 7. The air quenching nozzle 7 is located below the slag chute 5 and connected to the air quenching fan 6. The nozzle of the air quenching nozzle 7 is inclined toward the air quenching granulation chamber 8.

[0026] The air quenching and granulating chamber 8 is used to collect the granulated steel slag particles, and a second hopper 17 is provided at the bottom of the air quenching and granulating chamber 8 .

[0027] The slag pot tilting mechanism 1 sends the molten slag into the slag chute 5 for buffering and stabilizing the flow, and then flows out downward. The air quenching fan 6 provides appropriate air volume and pressure for the air quenching nozzle 7, so that the air quenching nozzle 7 can air quench and granulate the slag in the slag chute 5, and then the air quenching granulation chamber 8 collects the granulated slag particles.

[0028] The conveying assembly includes a high-temperature conveyor 9, which is arranged below the first drop hopper 16 and the second drop hopper 17 and connected to the feed port of the rotary heat exchanger 10 to feed the crushed slag into the rotary heat exchanger 10 for heat exchange, so as to recover the heat.

[0029] The waste heat recovery processing module includes a steam drum 14 , and the steam drum 14 transports steam through a steam transport pipeline 15 .

[0030] The drum 14 is connected to the water inlet of the rotary heat exchanger 10 through the first water inlet pipe 11 , and is connected to the water outlet of the rotary heat exchanger 10 through the first water outlet pipe 13 to form a circulation loop. A circulation pump 12 is provided on the first water inlet pipe 11 .

[0031] The water sent into the rotary heat exchanger 10 by the steam drum 14 absorbs the heat of the high-temperature solid slag through the membrane wall exchange and produces a steam-water mixture, which is then sent back to the steam drum 14 through the first water outlet pipe 13.

[0032] The rolling chamber 3 adopts a membrane wall structure, one end of the steam drum 14 is connected to the water inlet of the membrane wall structure through a second water inlet pipe 19, and the other side of the steam drum 14 is connected to the water outlet of the membrane wall structure through a second water outlet pipe 18.

[0033] The air quenching and granulating chamber 8 adopts a membrane wall structure, and the drum 14 is connected to the water inlet of the membrane wall structure through the third water inlet pipe 20, and the other side of the drum 14 is connected to the water outlet of the membrane wall structure through the third water outlet pipe 21. The membrane wall structure can recover the radiant heat during the rolling and crushing process and the air quenching and granulating process, and convert the cooling water output from the drum into a steam-water mixture and send it to the drum 14 for storage.

[0034] The dry dust removal module includes a dry bag dust collector 27, one end of the dry bag dust collector 27 is connected to the main dust removal pipeline 26, and the other end is connected to the chimney 29 through an air supply pipeline, and an induced draft fan 28 is arranged on the air supply pipeline.

[0035] The rolling chamber 3 is connected to the main dust removal pipeline 26 through a first dust removal branch pipe 22 , and a first dust removal regulating valve 23 is provided on the first dust removal branch pipe 22 .

[0036] Since no water is required in the crushing process of the crushing chamber 3, the dust removal by dry dust removal can prevent the secondary pollution of sewage sludge.

[0037] The wind quenching granulation chamber 8 is connected to the main dust removal pipeline 26 through the second dust removal branch pipe 24, and the second dust removal regulating valve 25 is arranged on the second dust removal branch pipe 24.

[0038] When in use, during the crushing process, the slag pot tilting mechanism 1 sends the semi-molten, solid slag into the crushing chamber 3 for crushing. The crushing chamber 3 absorbs the radiant heat of the high-temperature slag during the crushing process to form a steam-water mixture and sends it to the steam drum 14. At the same time, the smoke generated during the crushing process is collected into the main dust removal pipeline 26 through the first dust removal branch pipe 22, and is dusted by the dry bag dust collector 27, and then discharged through the chimney 29.

[0039] During the air quenching and granulation process, the slag pot tilting mechanism 1 sends the molten slag into the steel slag chute 5 for buffering and stabilizing the flow before discharge. The molten slag is air quenched and granulated by the cooperation of the air quenching nozzle 7 and the air quenching fan 6, and the air quenching granulation chamber 8 collects the particles after air quenching and granulation.

[0040] The air quenching and granulation chamber 8 absorbs the radiation heat of the high-temperature slag during the air quenching and granulation process to form a steam-water mixture and send it to the steam drum 14. At the same time, the smoke generated is collected into the main dust removal pipeline 26 through the second dust removal branch pipe 24, dedusted by the dry bag dust collector 27, and then discharged through the chimney 29.

[0041] The crushed slag is sent to the high-temperature conveyor 9 through the first hopper 16 and the second hopper 17 respectively. The high-temperature conveyor 9 sends the high-temperature slag to the rotary heat exchanger 10 for heat exchange and then discharges it through the low-temperature material outlet. At the same time, the steam-water mixture produced during the heat exchange process is sent to the steam drum 14 for collection. The steam drum 14 separates the steam-water mixture and then sends the steam out through the steam conveying pipeline.

[0042] The present invention provides a waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination. The system combines the rolling crushing process with the wind quenching granulation process, and can simultaneously crush molten, semi-molten and solid slags, thereby effectively improving the crushing efficiency of the high-temperature slag. At the same time, the waste heat in the crushing process is recovered and utilized through the cooperation of the steam drum, the rotary heat exchanger and the membrane wall structure. Moreover, the rolling crushing process does not require a large amount of water treatment, thereby reducing the generation of secondary sewage sludge caused by wet washing. The present invention adopts a dry bag dust collector to effectively recover and treat the smoke generated in the crushing process, thereby reducing the emission of environmental pollutants.

Claims

1. Waste heat recovery system applied to metallurgical high temperature slag granulation and crushing combination, characterized by: The invention comprises a material processing module, a waste heat recovery processing module and a dry dust removal module, wherein the waste heat recovery processing module and the dry dust removal module are respectively connected to the material processing module; the material processing module comprises a crushing component, an air quenching granulation component, a conveying component and a rotary heat exchanger (10); the waste heat recovery processing module comprises a steam drum (14), and the steam drum (14) transports steam through a steam transport pipeline (15); the dry dust removal module comprises a dry bag dust collector (27), one end of the dry bag dust collector (27) is connected to the main dust removal pipeline (26), and the other end is connected to the chimney (29) through an air supply pipeline, and an induced draft fan (28) is arranged on the air supply pipeline.

2. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 1 is characterized in that: The rolling and crushing assembly comprises a slag pot tilting mechanism (1), a rolling chamber (3), a rolling bed (4) being arranged at the bottom of the rolling chamber (3), a rolling crusher (2) being arranged above the rolling bed (4) in the rolling chamber (3), and a first drop hopper (16) being arranged at the bottom of the rolling bed (4).

3. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 2 is characterized in that: The rolling chamber (3) adopts a membrane wall structure, one end of the steam drum (14) is connected to the water inlet of the membrane wall structure through a second water inlet pipe (19), and the other side of the steam drum (14) is connected to the water outlet of the membrane wall structure through a second water outlet pipe (18).

4. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 2 is characterized in that: The rolling chamber (3) is connected to the main dust removal pipeline (26) via a first dust removal branch pipe (22), and a first dust removal regulating valve (23) is provided on the first dust removal branch pipe (22).

5. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 1 is characterized in that: The air quenching granulation assembly comprises an air quenching granulation chamber (8), a slag pot tilting mechanism (1), a steel slag chute (5), an air quenching fan (6), and an air quenching nozzle (7). The air quenching nozzle (7) is located below the steel slag chute (5) and is connected to the air quenching fan (6). The nozzle of the air quenching nozzle (7) is inclined toward the air quenching granulation chamber (8).

6. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 5 is characterized in that: The air quenching granulation chamber (8) adopts a membrane wall structure, the steam drum (14) is connected to the water inlet of the membrane wall structure through a third water inlet pipe (20), and the other side of the steam drum (14) is connected to the water outlet of the membrane wall structure through a third water outlet pipe (21).

7. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 5 is characterized in that: The wind quenching granulation chamber (8) is connected to the main dust removal pipeline (26) via a second dust removal branch pipe (24), and a second dust removal regulating valve (25) is provided on the second dust removal branch pipe (24).

8. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 1 is characterized in that: The conveying assembly comprises a high-temperature conveyor (9), and the high-temperature conveyor (9) is connected to the feed port of the rotary heat exchanger (10).

9. The waste heat recovery system for metallurgical high-temperature slag granulation and crushing combination according to claim 8, characterized in that: The steam drum (14) is connected to the water inlet of the rotary heat exchanger (10) via a first water inlet pipe (11), the steam drum (14) is connected to the water outlet of the rotary heat exchanger (10) via a first water outlet pipe (13), and a circulating pump (12) is provided on the first water inlet pipe (11).

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