Classified dust removal system for steel slag rolling and crushing area

Abstract

The utility model discloses a grading dust removal system for a steel slag rolling and crushing area, which comprises a rolling and crushing chamber pretreatment area, a coarse dust removal area and a fine dust removal area which are formed along a flue gas conveying direction, the aerial fog is bonded with dust particles in the flue gas, so that coarse particles in the flue gas are separated and settled from the flue gas under the action of gravity to form sewage, and the sewage is discharged; fine particles in the flue gas are further washed and removed in the fine dust removal area, and finally the flue gas which is qualified after being purified is discharged into the atmospheric environment through a chimney. According to the dust removal system, the dust removal flue gas is subjected to graded dust removal treatment, so that coarse particles in the flue gas can be removed in advance, the abrasion of a pipeline and the load of subsequent dust removal equipment can be reduced, the equipment operation is more energy-saving and reliable, and the environment-friendly effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel slag treatment technical field especially relates to a steel slag roller compaction crushing area grading dust removal system. BACKGROUND

[0002] Steel slag is a byproduct in the steel production process, and its output accounts for about 10% of the steel output. Steel slag treatment process is a key factor directly affecting the utilization of steel slag. At present, the hot stew process under pressure has developed into the mainstream technology in the field of steel slag primary treatment. The hot stew process under pressure mainly includes two steps: roller compaction crushing and hot stew. In the actual production process, a large amount of dust is generated in the roller compaction crushing link. If the dust hood is not designed reasonably or the dust removal efficiency is reduced after the dust remover and pipeline are scaled, a large amount of dust will overflow from the dust hood, and the smoke will disperse in the workshop, causing great pollution to the surrounding environment and seriously threatening production and personnel safety.

[0003] Therefore, it is necessary to propose a steel slag roller compaction crushing link to efficiently collect and process the dust generated in the roller compaction crushing process, so as to achieve the purpose of clean production. SUMMARY

[0004] In view of the shortcomings of the prior art, the utility model provides a steel slag roller compaction crushing area grading dust removal system, which effectively solves the problems of dust overflow, dust remover and pipeline scaling and efficiency reduction in the existing converter slag roller compaction crushing process through grading dust removal treatment of dust removal flue gas.

[0005] To achieve the above purpose, the utility model is realized by the following technical scheme:

[0006] A steel slag roller compaction crushing area grading dust removal system includes a roller compaction crushing chamber pretreatment area, a coarse dust removal area and a fine dust removal area formed along the flue gas conveying direction, wherein

[0007] The roller compaction crushing chamber pretreatment area is a space formed by the roller compaction crushing chamber, and a roller compaction crushing bed is arranged in the roller compaction crushing chamber. A large-capacity space sealed cover is adopted;

[0008] The coarse dust removal area is provided with an aerosol spray gun. The adhesion of aerosol and dust particles in flue gas makes coarse particles in flue gas separate from flue gas under the action of gravity and form sewage with the settlement of transformed water. The coarse dust removal area is provided with a discharge port at the bottom for discharging sewage;

[0009] The fine dust removal area is provided with a connected spray tower, a dehydrator and a wet electric dust remover. Fine particles in flue gas are further washed and removed. The flue gas after final purification is discharged to the atmospheric environment through a chimney.

[0010] Further, a plurality of water mist nozzles are arranged in the inner side part of the top of the roller crushing chamber pretreatment area, and an air suction port is arranged on the side of the top of the roller crushing chamber pretreatment area and is communicated with the air duct port of the coarse dust removal area.

[0011] Further, the coarse dust removal area comprises a sedimentation chamber, the bottom of the sedimentation chamber is provided with a discharge port and is connected with a sewage discharge pipe, the sewage discharged from the sewage discharge pipe enters a sewage collection tank, and then is lifted into a sewage treatment system through a pump set.

[0012] Further, the discharge port of the bottom of the sedimentation chamber is provided with an electric valve for controlling the discharge of sewage in the sedimentation chamber.

[0013] Further, the gas mist spray guns of the coarse dust removal area are uniformly distributed along the periphery of the air duct, so that the gas mist and the flue gas are fully mixed and contacted.

[0014] Further, the water pressure of the gas mist spray guns of the coarse dust removal area is 0.4-0.6 MPa, and the particle size of the atomized water is ≤40 μm.

[0015] Further, the air duct outlet of the coarse dust removal area is sequentially connected with a spray tower, a dehydrator, a fan and a wet electric dust collector of the fine dust removal area through a dust removal pipeline, and the flue gas after being finally purified is discharged into the atmospheric environment through a chimney.

[0016] Further, the dust-containing steam flow flue gas led out by the dust removal pipeline enters the spray tower along the pipeline under the negative pressure suction of the fan, a plurality of water mist spray guns are arranged on the upper section of the spray tower, and uniform and dense water mist spraying is realized.

[0017] The utility model discloses a steel slag roller crushing area grading dust removal system, including roller crushing chamber pretreatment area, coarse dust removal area, fine dust removal area, and the roller crushing chamber is located above the roller crushing bed, adopts the large capacity space airtight cover, arranges a plurality of water mist nozzles in the roller crushing chamber, sprays high -speed water mist above the roller compaction car, and the hot flue gas generated by roller compaction is cooled to the dew point below, the coarse dust removal area is equipped with gas mist spray gun, and the dust particles in the flue gas collide, adhere, grow with the gas mist, make the coarse particle in the flue gas separate and settle down under the action of gravity, and the fine dust removal area includes spray tower, dehydrator, wet electric dust collector etc.

[0018] The steel slag roller crushing area dust removal system can remove coarse particles in the flue gas in advance, reduce the abrasion of the pipeline and the load of the subsequent dust removal equipment, run more energy-saving and reliable, and has better environmental protection effect. ACCURACY OF DRAWINGS

[0019] Figure 1 It is a kind of steel slag roller crushing area grading dust removal system structure schematic diagram provided by the utility model.

[0020] Fig. 1-roller crushing chamber pretreatment area; 2-water mist nozzle;

[0021] 3-coarse dust removal area; 3-1 gas mist spray gun; 3-2 settling chamber; 3-3 electric valve; 3-4 blowdown pipe;

[0022] 4-roller; 5-roller crushing bed; 6-dust removal pipeline;

[0023] 7-fine dust removal area; 7-1 spray tower, 7-2 dehydrator, 7-3 fan, 7-4 wet electric dust collector, 7-5 chimney;

[0024] 8-1 sewage collection tank; 8-2 pump set. DETAILED DESCRIPTION

[0025] The utility model will be further described below in combination with the drawings:

[0026] Embodiment: Please refer to Figure 1 A steel slag roller crushing area grading dust removal system, including the roller crushing chamber pretreatment area 1, coarse dust removal area 3 and fine dust removal area 7 formed along the flue gas conveying direction: wherein the roller crushing chamber pretreatment area 1 is the space formed by the roller crushing chamber, and the roller crushing bed 5 is arranged in the roller crushing chamber, and a large-capacity space airtight cover is used;The coarse dust removal area 3 is provided with the gas mist spray gun 3-1, and the dust particles in the flue gas are bonded with the gas mist to make the coarse particles in the flue gas separate from the flue gas under the action of gravity and form sewage with the water converted by the gas mist, and the coarse dust removal area 3 is provided with a discharge port at the bottom for discharging sewage;The fine dust removal area 7 is provided with the spray tower 7-1, dehydrator 7-2 and wet electric dust collector 7-4 connected, further washes and removes the fine particles of flue gas, and finally the flue gas after purification is qualified is discharged to the atmospheric environment through the chimney. The utility model discloses that the roller crushing chamber pretreatment area top inside is partitioned and arranged with a plurality of water mist nozzles 2, and the roller crushing chamber pretreatment area top side is provided with a suction port in communication with the air duct opening of the coarse dust removal area.

[0027] The utility model discloses a steel slag roller crushing area grading dust removal system, including roller crushing chamber pretreatment area 1, coarse dust removal area 3, fine dust removal area 7, dust removal pipeline 6 and auxiliary water treatment system 8 etc. The roller crushing chamber pretreatment area 1 adopts heat-resistant steel plate, and a suction port is designed on the top, which needs to be anticorrosion treated according to high-temperature steam and steel slag dust working conditions.

[0028] The roller crushing chamber pretreatment area 1 is located above the roller crushing bed 5, adopts a large-capacity space airtight cover, and can effectively collect the smoke dust generated during the roller crushing of steel slag.

[0029] A plurality of water mist nozzles 2 are arranged in the inner part of the top of the roll crushing chamber pretreatment area 1. First, the steel slag is poured on the roll crushing bed 5 for distribution, and the roll crusher 4 is equipped with a comb roller for back and forth rolling. At the same time, the water mist nozzles 2 are opened, and the high-speed water mist sprayed by the water mist nozzles first absorbs the sensible heat of the flue gas to cool the flue gas below the dew point temperature. In this way, the high-temperature flue gas can be rapidly cooled for a short time, the volume is greatly reduced, the air volume of the dust removal system is reduced, the energy consumption cost of the system operation is reduced, and the purpose of energy saving and emission reduction is achieved. After the water particles contact with the high-temperature slag, they all gasify, and there is no potential risk of explosion caused by mechanical water, ensuring the safety and efficiency of the rolling process.

[0030] When the flue gas flows through the coarse dust removal area 3, a plurality of groups of gas mist spray guns 3-1 are arranged in the coarse dust removal area 3. The gas mist collides with, adheres to, and grows with the dust particles in the flue gas, so that the coarse particles in the flue gas are separated and settled from the flue gas under the action of gravity. The gas mist itself can also wash, purify and remove the dust particles in the flue gas. To ensure sufficient mixing and contact between the gas mist and the flue gas, the gas mist spray guns 3-1 can be uniformly distributed along the radial direction of the air duct. To ensure good water atomization effect, the water pressure is 0.4-0.6 MPa, and the atomized water particle size is ≤40 μm. The sewage generated by the flue gas spraying falls into the settling chamber 3-2. When the sewage in the settling chamber 3-2 reaches a certain liquid level, the electric valve 3-3 at the bottom outlet of the settling chamber 3-2 is opened. The sewage is discharged through the sewage pipe 3-4 and enters the sewage collection tank 8-1 on the ground, and then is lifted into the sewage treatment system through the pump set 8-2.

[0031] The coarse dust removal area 3 is connected to the fine dust removal area 7 through a dust removal pipeline 6. The equipment in the fine dust removal area 7 mainly includes a spray tower 7-1, a dehydrator 7-2, a wet electric dust collector 7-4, a fan 7-3, a chimney 7-5, etc. The finally purified flue gas is discharged to the atmosphere through the chimney 7-5. The flue gas containing dust steam introduced from the dust removal pipeline 6 has a high moisture content, and under the negative pressure suction of the fan 7-3, it enters the spray tower 7-1 along the pipeline. The upper section of the spray tower 7-1 is provided with a plurality of water mist spray guns to realize uniform and dense water mist spraying, and the flue gas containing dust steam is further washed and purified. During normal operation, the purified flue gas enters the dehydrator 7-2 through the connecting flue, and a plurality of external dehydrators are arranged on the dehydrator 7-2. After the moisture content of the flue gas is effectively reduced, it is introduced into the wet electric dust collector 7-4 through the fan 7-3 for further dust removal and purification. The finally purified flue gas is discharged to the atmosphere through the chimney. The dust concentration in the flue gas is less than 10 mg / Nm 3 , which meets the national ultra-low emission requirements.

[0032] The above description is only an embodiment of the use of the technical content of the present invention. Any person skilled in the art who uses the present invention to make modifications and changes is within the scope of the patent claimed by the present invention, and is not limited to the embodiments disclosed.

Claims

1. A steel slag roller compacted break zone classification dedusting system, characterized in that: It comprises a roller crushing chamber pretreatment area, a coarse dust removal area and a fine dust removal area formed along the flue gas conveying direction, wherein The roller crushing chamber pretreatment area is a space formed by the roller crushing chamber, and a roller crushing bed is arranged in the roller crushing chamber, and a large-capacity space sealing cover is used; The coarse dust removal area is provided with an aerosol spray gun, and the aerosol is bonded with the dust particles in the flue gas to make the coarse particles in the flue gas separate and settle under the action of gravity to form sewage, and the bottom of the coarse dust removal area is provided with a discharge port for discharging sewage; The fine dust removal area is provided with a connected spray tower, a dehydrator and a wet electric dust collector, which further washes and removes fine particles in the flue gas, and finally the purified flue gas is discharged to the atmospheric environment through the chimney.

2. The steel slag roller compacted breaking area classification dedusting system according to claim 1, characterized in that: A plurality of water mist nozzles are arranged in the inner side of the top of the roller crushing chamber pretreatment area, and the side of the top of the roller crushing chamber pretreatment area is provided with an air suction port which is communicated with the air duct port of the coarse dust removal area.

3. The steel slag roller compacted breaking area classification dedusting system according to claim 1 or 2, characterized in that: The coarse dust removal area includes a settling chamber, the bottom of the settling chamber is provided with a discharge port and is connected with a sewage discharge pipe, the sewage discharged from the sewage discharge pipe enters a sewage collection tank, and then is lifted into a sewage treatment system through a pump set.

4. The steel slag roller compacted breaking area classification dedusting system according to claim 3, characterized in that: The bottom discharge port of the settling chamber is provided with an electric valve for controlling the discharge of sewage in the settling chamber.

5. The steel slag roller compacted break zone classification dedusting system according to claim 1, characterized in that: The aerosol spray guns of the coarse dust removal area are uniformly distributed along the radial direction of the air duct to ensure that the aerosol and the flue gas are fully mixed and contacted.

6. The steel slag roller compacted break zone classification dedusting system according to claim 5, characterized in that: The water pressure of the aerosol spray gun of the coarse dust removal area is 0.4-0.6 MPa, and the particle size of the atomized water is ≤40 μm.

7. The steel slag roller compacted breaking area classification dedusting system according to claim 1, characterized in that: The coarse dust removal area is provided with an air duct outlet and is connected with the spray tower, the dehydrator, the fan and the wet electric dust collector of the fine dust removal area in sequence through a dust removal pipeline, and finally the purified flue gas is discharged to the atmospheric environment through the chimney.

8. The steel slag roller compacted break zone classification dedusting system according to claim 7, characterized in that: The dust-containing steam flow flue gas introduced by the dust removal pipeline enters the spray tower along the pipeline under the negative pressure suction of the fan, a plurality of water mist spray guns are arranged in the upper section of the spray tower to realize uniform and dense water mist spraying.

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