Dust removal system for steel slag rolling and crushing area

Abstract

The invention discloses a steel slag rolling and crushing area dust removal system which comprises a rolling and crushing chamber, a water mist generating device, a coarse particle separating and returning device, a dust removal pipeline and wet dust removal equipment, and the rolling and crushing chamber is located above a rolling and crushing bed and used for collecting smoke dust generated during rolling and crushing of steel slag; a plurality of water mist generating devices are arranged in the rolling crushing chamber and spray high-speed aerial fog above the rolling vehicle, one side of the top of the rolling crushing chamber is connected with a coarse particle separation and return device, and the side face of the coarse particle separation and return device is connected with wet dust removal equipment through a dust removal pipeline. Coarse particle impurities generated by the coarse particle separation and return device are discharged through the ash discharge chute and return to the rolling and crushing bed again. The problem of flying dust overflow caused in the existing converter slag grinding and crushing process is solved, the air volume of a dust removal system can be reduced, the operation energy consumption cost of the system is reduced, and therefore the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of steel slag processing, and in particular to a dust removal system in a steel slag rolling and crushing area. Background Art

[0002] Steel slag is a by-product of the steelmaking process, and its output accounts for about 10% of steel production. The steel slag treatment process is a key factor that directly affects the utilization of steel slag. At present, the hot-simmering process with pressure has developed into the mainstream process technology in the field of primary treatment of steel slag, and has been applied and promoted in more and more new or expanded projects. The hot-simmering process with pressure is mainly divided into two steps: roller crushing and hot-simmering; in the roller crushing process, the steel slag is first roller crushed, and after the slag is laid, the comb roller of the rolling car rolls back and forth, and water is sprayed appropriately during rolling to cool the steel slag until the maximum particle size is less than 150mm. In the hot-simmering process, the hot-simmering slag pot containing the hot-crushed steel slag is hoisted into the hot-simmering pot, and the water spray valve is opened to spray water to cool down and generate steam, and the steam pressure in the hot-simmering pot is controlled to be stable within a certain range of 0.3~0.35MPa.

[0003] The hot-pressing and stewing process is equipped with a wet dust removal system, which purifies the dust-containing steam generated by the roller crushing and stewing process through a spray tower, a dehydrator, and a wet electrostatic precipitator before being discharged into the atmosphere. In the actual production process, a large amount of dust will be generated in the roller crushing process. If the dust hood is not designed properly or the dust collector and pipeline are scaled and the dust removal efficiency is reduced, a large amount of dust will still overflow from the dust hood, and the smoke and dust will diffuse in the workshop, causing great pollution to the surrounding environment, seriously threatening production and personnel safety.

[0004] Therefore, it is necessary to propose a dust removal system for the slag rolling and crushing area to efficiently collect and treat the dust generated during the rolling and crushing process, and ultimately achieve the goal of clean production. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a dust removal system for a slag rolling and crushing area, which effectively solves the problems of dust overflow, scaling and efficiency reduction of dust collectors and pipelines caused by the existing converter slag rolling and crushing process.

[0006] To achieve the above object, the present invention is achieved through the following technical solutions:

[0007] A dust removal system for a slag rolling and crushing area comprises a roller crushing chamber, a water mist generating device, a coarse particle separation and return device, a dust removal pipeline and a wet dust removal device. The roller crushing chamber is located above a roller crushing bed and is used to collect smoke generated during the roller crushing of steel slag. A plurality of water mist generating devices are arranged in the roller crushing chamber, and the plurality of water mist generating devices spray high-speed aerosol above the rolling vehicle. One side of the top of the roller crushing chamber is connected to the coarse particle separation and return device, and the side of the coarse particle separation and return device is connected to the wet dust removal device through a dust removal pipeline. The coarse particle separation and return device comprises a settling chamber, and the bottom discharge port of the settling chamber is connected to an ash discharge chute. The coarse particle impurities generated by the coarse particle separation and return device are discharged through the ash discharge chute and returned to the rolling and crushing bed.

[0008] Furthermore, the roller crushing chamber adopts heat-resistant steel plate to form a large-capacity space enclosed cover, and an air intake is designed on the top.

[0009] Furthermore, a water mist generating device is arranged in a partition on the inner side of the top of the roller crushing chamber. The water mist generating device includes a pipeline, a valve and a plurality of water mist nozzles. The water mist nozzles extend along the direction of the roller crushing bed.

[0010] Furthermore, the settling chamber includes a settling chamber main body and a matching settling chamber cone section. Several vibrating motors are provided on the outside of the settling chamber cone section to prevent the coarse particles in the settling chamber from becoming compacted. The outlet of the settling chamber cone section is a discharge port, and an ash discharge valve is provided at the discharge port.

[0011] Furthermore, the roller crushing chamber and the coarse particle separation and return device are arranged in the workshop, and the wet dust removal equipment is arranged outside the workshop. The wet dust removal equipment is connected to the side outlet of the sedimentation chamber through a dust removal pipeline to form a dust removal channel.

[0012] Furthermore, the wet dust removal equipment is mainly assembled from a spray tower, a dehydrator, a wet electrostatic precipitator, a fan, and a chimney.

[0013] Further, the dust removal system of the slag crushing area includes the following steps:

[0014] S1. First, pour the steel slag onto the rolling and crushing bed for slag distribution. The rolling vehicle rolls back and forth. During rolling, the water mist generating device is turned on. The high-speed aerosol sprayed by the water mist nozzle absorbs the sensible heat of the flue gas and cools the flue gas to below the condensation temperature. Then, the aerosol collides and bonds with the dust particles in the flue gas. The flue gas enters the precipitation chamber from the air inlet.

[0015] S2. When the flue gas flows through the settling chamber, the particles in the flue gas will separate and settle from the flue gas under the action of gravity when their diameter grows to a certain extent. The coarse particles in the flue gas will settle into the settling chamber in a short time. When the coarse particles in the settling chamber reach a certain weight or material level, the ash discharge valve at the discharge port at the bottom of the settling chamber will open, and the coarse particles will be discharged through the ash discharge chute and returned to the crushing bed.

[0016] S3. After passing through the sedimentation chamber, the flue gas enters the wet dust removal equipment through the dust removal pipeline. The purified flue gas is discharged into the atmosphere through the chimney.

[0017] The slag crushing area dust removal system of the present invention can achieve short-term rapid cooling of high-temperature flue gas and greatly shrink the volume, thereby reducing the air volume of the dust removal system and reducing the energy consumption cost of the system operation, thereby achieving the purpose of energy saving and emission reduction. The system of the present invention is safe and reliable. Due to the good atomization performance of the nozzle, the atomized water particles are completely vaporized after contacting the high-temperature flue gas, and there is no potential danger of explosion caused by mechanical water. The coarse particle separation and return system in the system of the present invention pre-treats the dust removal flue gas, which can remove the coarse particles in the dust in advance, and can reduce the wear of the equipment and the load of the subsequent dust removal equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a dust removal system in a steel slag rolling and crushing area provided by the present invention.

[0019] Figure 2 The present invention provides a slag crushing area dust removal system Figure 1 Enlarged view of part A in the middle.

[0020] In the figure,

[0021] 1-roller crushing chamber; 2-water mist generating device;

[0022] 3- Coarse particle separation and return system; 3-1 Settling chamber; 3-2 Vibrating motor; 3-3 Star-shaped ash discharge valve; 3-4 Ash discharge chute;

[0023] 4- Rolling vehicle; 5- Rolling crushing bed; 6- Dust removal pipeline; 7- Wet dust removal equipment. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Example: See Figure 1 and Figure 2 A slag rolling crushing area dust removal system includes a roller crushing chamber 1, a water mist generating device 2, a coarse particle separation and return system 3, a dust removal pipeline 6, and a wet dust removal device 7. The roller crushing chamber 1 is made of heat-resistant steel plate, and an air suction port is designed on the top, which needs to be treated with anti-corrosion according to the working conditions of high-temperature steam and slag dust.

[0026] like Figure 1 As shown, the roller crushing chamber 1 is located above the roller crushing bed 5 and adopts a large-capacity space closed cover, which can effectively collect the smoke and dust generated during the roller crushing of the steel slag.

[0027] like Figure 1A water mist generating device 2 is arranged in a partition on the inner side of the top of the roller crushing chamber 1. The water mist generating device 2 includes a pipe, a valve and a plurality of water mist nozzles. First, the steel slag is dumped on the roller crushing bed 5 for slag distribution. The roller 4 will be equipped with a comb-toothed roller to roll back and forth. While rolling, the water mist generating device 2 is turned on. The high-speed aerosol sprayed by the water mist nozzle will first absorb the sensible heat of the flue gas to cool the flue gas to below the condensation temperature, and then collide, bond and grow with the dust particles in the flue gas. In order to ensure a good atomization effect of the sprayed water, the water pressure is 0.4-0.6MPa, and the particle size of the atomized water particles is ≤4oμm.

[0028] When the flue gas flows through the settling chamber 3-1, the particles in the flue gas will separate and settle from the flue gas under the action of gravity when the diameter of the particles grows to a certain extent. The coarse particles in the flue gas will settle into the settling chamber 3-1 in a short time. When the coarse particles in the settling chamber 3-1 reach a certain weight or material level, the star-shaped ash discharge valve 3-3 at the bottom discharge port of the settling chamber 3-1 is opened, and the coarse particles are discharged through the ash discharge chute 3-4 and returned to the rolling crushing bed 5. In order to prevent the coarse particles in the settling chamber 3-1 from compacting, a number of vibration motors 3-2 are provided on the outer side of the cone section of the settling chamber 3-1.

[0029] The coarse particle separation return system 3 is connected to the wet dust removal equipment 7 through the dust removal pipeline 6. The wet dust removal equipment 7 is mainly composed of a spray tower, a dehydrator, a wet electrostatic precipitator, a fan, a chimney, etc., and the finally purified flue gas is discharged into the atmosphere through the chimney.

[0030] The dust removal system of the steel slag rolling and crushing area of ​​the present invention comprises the following steps:

[0031] S1. First, pour the steel slag onto the rolling and crushing bed for slag distribution. The rolling vehicle rolls back and forth. During rolling, the water mist generating device is turned on. The high-speed aerosol sprayed by the water mist nozzle absorbs the sensible heat of the flue gas and cools the flue gas to below the condensation temperature. Then, the aerosol collides and bonds with the dust particles in the flue gas. The flue gas enters the precipitation chamber from the air inlet.

[0032] S2. When the flue gas flows through the settling chamber, the particles in the flue gas will separate and settle from the flue gas under the action of gravity when their diameter grows to a certain extent. The coarse particles in the flue gas will settle into the settling chamber in a short time. When the coarse particles in the settling chamber reach a certain weight or material level, the ash discharge valve at the discharge port at the bottom of the settling chamber will open, and the coarse particles will be discharged through the ash discharge chute and returned to the crushing bed.

[0033] S3. After passing through the sedimentation chamber, the flue gas enters the wet dust removal equipment through the dust removal pipeline. The purified flue gas is discharged into the atmosphere through the chimney.

[0034] The present invention discloses a dust removal system for a steel slag rolling and crushing area. The roller crushing chamber is located above the roller crushing bed and adopts a large-capacity space closed cover, which can effectively collect smoke and dust generated during the roller crushing of steel slag. A plurality of water mist nozzles are arranged in the roller crushing chamber, and high-speed aerosol is sprayed above the rolling vehicle. First, the sensible heat of the flue gas is absorbed to cool the flue gas to below the condensation temperature, and then the aerosol collides, adheres, and grows with the dust particles in the flue gas. When the particle diameter grows to a certain extent, it will separate and settle from the flue gas under the action of gravity, and finally return to the rolling and crushing bed, which can reduce the wear of the equipment and the load of the subsequent dust removal equipment.

[0035] The above records are only embodiments of the present invention. Any modification or change made by a person familiar with the present technology using the present invention shall fall within the patent scope claimed by the present invention and shall not be limited to those disclosed in the embodiments.

Claims

1. A slag crushing area dust removal system, characterized by: It includes a roller crushing chamber, a water mist generating device, a coarse particle separation and return device, a dust removal pipeline and a wet dust removal device. The roller crushing chamber is located above the roller crushing bed and is used to collect smoke and dust generated during the roller crushing of steel slag. A plurality of water mist generating devices are arranged in the roller crushing chamber, and the plurality of water mist generating devices spray high-speed gas mist above the rolling vehicle. One side of the top of the roller crushing chamber is connected to the coarse particle separation and return device, and the side of the coarse particle separation and return device is connected to the wet dust removal equipment through a dust removal pipeline. The coarse particle separation and return device includes a sedimentation chamber, and the bottom discharge port of the sedimentation chamber is connected to the ash discharge chute. The coarse particle impurities generated by the coarse particle separation and return device are discharged through the ash discharge chute and returned to the roller crushing bed.

2. A slag crushing area dust removal system according to claim 1, characterized in that: The roller crushing chamber adopts heat-resistant steel plate to form a large-capacity space closed cover, and an air suction port is designed on the top.

3. The slag crushing area dust removal system according to claim 1 is characterized by: A water mist generating device is arranged in a partition inside the top of the roller crushing chamber. The water mist generating device includes a pipeline, a valve and a plurality of water mist nozzles. The water mist nozzles extend along the direction of the roller crushing bed.

4. The slag crushing area dust removal system according to claim 1 is characterized by: The settling chamber includes a settling chamber body and a matching settling chamber cone section. Several vibrating motors are arranged on the outside of the settling chamber cone section to prevent the coarse particles in the settling chamber from compacting. The outlet of the settling chamber cone section is a discharge port, and an ash discharge valve is arranged at the discharge port.

5. The slag crushing area dust removal system according to claim 1 is characterized by: The roller crushing chamber and the coarse particle separation and return device are arranged in the workshop, and the wet dust removal equipment is arranged outside the workshop. The wet dust removal equipment is connected with the side outlet of the sedimentation chamber through the dust removal pipeline to form a dust removal channel.

6. The slag crushing area dust removal system according to claim 1 is characterized by: Wet dust removal equipment is mainly assembled from a spray tower, a dehydrator, a wet electrostatic precipitator, a fan and a chimney.

7. A slag crushing area dust removal system according to any one of claims 1 to 6, characterized in that: The dust removal method of the system includes the following steps: S1. First, pour the steel slag onto the rolling and crushing bed for slag distribution. The rolling vehicle rolls back and forth. During rolling, the water mist generating device is turned on. The high-speed aerosol sprayed by the water mist nozzle absorbs the sensible heat of the flue gas and cools the flue gas to below the condensation temperature. Then, the aerosol collides and bonds with the dust particles in the flue gas. The flue gas enters the precipitation chamber from the air inlet. S2. When the flue gas flows through the settling chamber, the particles in the flue gas will separate and settle from the flue gas under the action of gravity when their diameter grows to a certain extent. The coarse particles in the flue gas will settle into the settling chamber in a short time. When the coarse particles in the settling chamber reach a certain weight or material level, the ash discharge valve at the discharge port at the bottom of the settling chamber will open, and the coarse particles will be discharged through the ash discharge chute and returned to the crushing bed. S3. After passing through the sedimentation chamber, the flue gas enters the wet dust removal equipment through the dust removal pipeline. The purified flue gas is discharged into the atmosphere through the chimney.

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