Dedusting and dewatering device and method

Abstract

The invention discloses a dust removal and dehydration device and method.The dust removal and dehydration device comprises a hot stuffy slag tank and a water distribution, purification and recovery system; an inlet / outlet communicated with the cavity in the hot disintegrating slag tank is formed in one side of the hot disintegrating slag tank, a cover plate for sealing the inlet / outlet is arranged at the inlet / outlet, and when the cover plate is in a closed state, the cavity is a closed space; the water distribution purification and recovery system is arranged in the cavity, and the output end of the water distribution purification and recovery system penetrates through the side wall of the hot disintegrating slag tank to be communicated with the outside. The water distribution purification and recovery system in the dust removal and dehydration device is arranged in the cavity of the hot disintegrating slag tank, and when the water distribution purification and recovery system sprays water drops to red hot steel slag, the density and pressure of dust-containing steam in the cavity are rapidly increased, so that the dust-containing steam can be in contact with the water drops in a pressure environment; therefore, the coagulation effect and the dehydration effect of dust in the dust-containing steam are improved, and the dust does not need to be introduced into a plurality of purification devices for treatment, so that the treatment cost of the dust-containing steam is effectively reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of hot slag treatment process, and specifically relates to a dust removal and dehydration device and method. Background Art

[0002] Steel slag is a byproduct of the steelmaking process. It is composed of various oxides formed by the oxidation of impurities such as silicon, manganese, phosphorus, and sulfur in pig iron during the smelting process, as well as salts formed by the reaction of these oxides with solvents. Steel slag contains a variety of useful ingredients: 2% to 8% metallic iron, 40% to 60% calcium oxide, 3% to 10% magnesium oxide, and 1% to 8% manganese oxide, so it can be used as a raw material for steel metallurgy.

[0003] At present, most steel enterprises use the hot stuffing method to treat steel slag, that is, spraying cold water directly on the red-hot steel slag in the hot stuffing tank to reduce the temperature of the steel slag; the low-pressure steam generated in the hot stuffing process contains a large amount of dust and water vapor, which makes this part of the low-pressure steam unable to be used directly. It can only be discharged into the environment or introduced into the purification system for treatment before being used or discharged; Among them,

[0004] If low-pressure steam is discharged directly, it will pollute the surrounding environment;

[0005] However, common purification equipment cannot meet the requirements for processing low-pressure steam containing a large amount of dust and water vapor. The purification effect can only be improved by increasing the number of purification equipment or developing purification equipment with better purification effect. Both methods will increase the cost of the treatment equipment, and the large amount of dust and water vapor in the low-pressure steam will affect the discharge and the related valves, pipes and equipment introduced into the purification equipment, resulting in a significant increase in the cost of processing dust-containing steam. Therefore, inventing a method that can reduce the cost of processing dust-containing steam is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a dust removal and dehydration device on the one hand to solve the technical problem of high processing cost of low-pressure steam containing a large amount of dust and water vapor in the prior art.

[0007] The technical solution adopted to achieve the purpose of this application is:

[0008] A dust removal and dehydration device, comprising a hot slag tank and a water distribution purification and recovery system;

[0009] An inlet and outlet communicating with the cavity in the hot slag pot are arranged on one side of the hot slag pot, and a cover plate for closing the inlet and outlet is arranged at the inlet and outlet. When the cover plate is in a closed state, the cavity is a closed space;

[0010] The water distribution, purification and recovery system is arranged in the cavity, and the output end of the water distribution, purification and recovery system passes through the side wall of the hot slag pot and is communicated with the outside.

[0011] In order to better realize the present application, further optimization is made in the above structure, and the water distribution, purification and recovery system includes at least one group of droplet spray pipes for distributing water to the red-hot slag in the cavity.

[0012] In order to better realize the present application, further optimization is made in the above structure, and the water distribution purification and recovery system also includes multiple groups of corrugated dust removal plates;

[0013] The plurality of groups of the corrugated dust removal plates are sequentially arranged along a first direction, the first direction forms an angle with a horizontal direction, and a curved flow gap is formed between two adjacent groups of the corrugated dust removal plates;

[0014] The droplet spray pipe is arranged above the corrugated dust removal plate.

[0015] In order to better realize the present application, further optimization is made in the above structure, and the water distribution purification and recovery system includes a laminar water distribution plate;

[0016] The laminar water distribution plate is arranged between the droplet water spray pipe and the corrugated dust removal plate.

[0017] In order to better realize the present application, further optimization is made in the above structure, and the water distribution purification and recovery system includes multiple groups of dehydration plates;

[0018] A plurality of groups of dehydration plates are arranged in sequence along a first direction;

[0019] The dehydration plate is located above the liquid drop spray pipe.

[0020] In order to better realize the present application, further optimization is made in the above structure, and the water distribution purification and recovery system includes a purification pipeline;

[0021] The purification pipeline is arranged near the top of the cavity, and the air inlet of the purification pipeline is arranged toward the bottom of the cavity, and the exhaust port of the purification pipeline passes through the side wall of the hot slag pot and communicates with the outside;

[0022] The corrugated dust removal plate and the laminar water distribution plate are arranged in sequence in the purification pipe from the air inlet of the purification pipe to the air outlet of the purification pipe, the droplet water spray pipe and the dehydration plate are arranged at the air outlet of the purification pipe, and the air outlet of the purification pipe passes through the side wall of the hot slag tank and is connected to the outside.

[0023] In order to better realize the present application, further optimization is made in the above structure, which also includes a red slag vehicle for transporting red-hot steel slag.

[0024] In order to better realize the present application, further optimization is made in the above structure, and a drainage outlet is provided at the bottom of the red slag truck.

[0025] In order to better realize the present application, further optimization is made in the above structure, and a conveying track is provided in the cavity;

[0026] The conveying track is located below the water distribution purification and recovery system;

[0027] The red slag car is provided with rollers, and the red slag car is movably arranged on the conveying track through the rollers.

[0028] On the other hand, the present application also provides a dust removal and dehydration method, which is implemented by the above-mentioned dust removal and dehydration device, and the method comprises the following steps:

[0029] The red-hot slag is fed into the cavity of the hot slag tank through the inlet and outlet, and the cover is closed;

[0030] Start the water distribution purification and recovery system to spray water droplets onto the red-hot slag and generate dust-laden steam;

[0031] The dust-containing steam will increase the pressure in the cavity and turn it into a pressurized environment. After the dust-containing steam is purified into pure steam by the water distribution purification and recovery system in the pressurized environment, the pure steam is introduced into the gas-using equipment through the output end of the water distribution purification and recovery system for recycling, or is discharged to the outside through the output end of the water distribution purification and recovery system.

[0032] It can be seen from the above technical scheme that the water distribution, purification and recovery system in the dust removal and dehydration device provided in the present application is arranged in the cavity of the hot slag tank. When the water distribution, purification and recovery system sprays water droplets to the red-hot slag, the density and pressure of the dust-containing steam in the cavity increase rapidly, so that the dust-containing steam and water droplets can contact in a pressurized environment, so as to improve the condensation and dehydration effect of the dust in the dust-containing steam, and there is no need to introduce multiple purification equipment for treatment, thereby effectively reducing the treatment cost of the dust-containing steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a dust removal and dehydration device provided in this application;

[0034] Figure 2 A cross-sectional view of a dust removal and dehydration device provided in this application;

[0035] Figure 3 A schematic diagram of the structure of a water distribution purification and recovery system in a dust removal and dehydration device provided in this application.

[0036] Description of reference numerals:

[0037] 1-hot slag pot, 11-cavity, 12-cover plate, 13-conveying track;

[0038] 2-water distribution purification and recovery system, 21-liquid droplet spray pipe, 22-corrugated dust removal plate, 23-laminar water distribution plate, 24-dehydration plate, 25-purification pipeline;

[0039] 3-Red slag truck, 31-Drainage outlet. DETAILED DESCRIPTION

[0040] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0041] In the embodiments of the present application, Figures 1 to 3 As shown, the dust removal and dehydration device includes a hot slag tank 1 and a water distribution purification and recovery system 2; wherein,

[0042] An inlet and outlet connected to the cavity 11 in the hot smoldering slag pot 1 is provided on one side of the hot smoldering slag pot 1. Steel slag can be fed into the hot smoldering slag pot 1 through the inlet and outlet, or sent out from the hot smoldering slag pot 1. A cover plate 12 for closing the inlet and outlet is provided at the inlet and outlet; when the cover plate 12 is in a closed state, the cavity 11 is a closed space;

[0043] The water distribution, purification and recovery system 2 is arranged in the cavity 11 , and the output end of the water distribution, purification and recovery system 2 passes through the side wall of the hot slag pot 1 and communicates with the outside.

[0044] During the hot smelting process, the staff can start the water distribution purification and recovery system 2, and the external cold water is sprayed into the hot smelting slag tank 1 through the water distribution purification and recovery system 2. The sprayed droplets will contact the red-hot smelting slag in the hot smelting slag tank 1, so that the droplets will quickly evaporate into steam, and the dust generated by the red-hot smelting slag in the process of cold explosion will also be mixed into the steam, so that the steam becomes dust-containing steam and floats upward. The continuously dripping droplets can collide with the dust particles and droplets in the dust-containing steam in the hot smelting slag tank 1, so that the dust in the dust-containing steam condenses and falls. At the same time, the dripping droplets will also lower the temperature of the steam, so that the water in the steam condenses and drips downward;

[0045] And as the amount of dust-laden steam increases rapidly, the density and pressure of the dust-laden steam in the cavity 11 increase rapidly, so that the dust-laden steam and the liquid droplets can contact in a pressurized environment, which can improve the contact efficiency between the dust-laden steam and the liquid droplets, thereby improving the condensation and dehydration effects of the dust particles in the dust-laden steam.

[0046] It should be noted that red-hot slag is the state of steel slag when it is heated to 500-600 degrees Celsius. At this time, the steel slag will begin to show a dark red color, which is the red-hot slag mentioned in this application.

[0047] In some embodiments, the water distribution, purification and recovery system 2 includes at least one set of droplet spray pipes 21 for distributing water to the red-hot slag in the cavity 11, see Figure 2 and Figure 3 In this embodiment, the number of the above-mentioned droplet spray pipes 21 is ten groups, and the ten groups of droplet spray pipes 21 are arranged at equal intervals along the axial direction of the hot slag tank 1. The ten groups of droplet spray pipes 21 can simultaneously distribute water to the red-hot slag in the cavity 11 to improve the hot stuffing efficiency.

[0048] In some embodiments, the water distribution purification and recovery system 2 further includes a plurality of sets of corrugated dust removal plates 22;

[0049] The plurality of groups of corrugated dust removal plates 22 are sequentially arranged along the first direction. In this embodiment, the plurality of groups of corrugated dust removal plates 22 are arranged in the horizontal direction, that is, the angle between the first direction and the horizontal direction is 0°. Figure 3 , a curved flow gap is formed between two adjacent groups of corrugated dust removal plates 22;

[0050] The droplet spray pipe 21 is arranged above the corrugated dust removal plate 22;

[0051] The water droplets sprayed from the droplet spray pipe 21 will form a water film on the surface of the corrugated dust removal plate 22 during the falling process, which can effectively wash the corrugated dust removal plate 22 and remove dust and cool down the dust-containing steam in the flow gap; at the same time, the cold water is contacted and preheated with the steam, so that the cold water is turned into hot water, and contacts the red-hot slag in the cavity 11 when falling;

[0052] When hot water is evenly sprinkled on the red-hot slag, the dust-containing steam generated by the heat exchange between the hot water and the red-hot slag enters the flow gap from bottom to top, and preliminary dust removal and dehydration are carried out in the curved flow gap.

[0053] The angle between the first direction and the horizontal direction can be set to be greater than or equal to 0 degrees and less than 90 degrees, so that a flow gap can be formed between two adjacent groups of corrugated dust removal plates 22.

[0054] In some embodiments, the water distribution, purification and recycling system 2 includes a laminar water distribution plate 23;

[0055] The laminar water distribution plate 23 is arranged between the droplet spray pipe 21 and the corrugated dust removal plate 22. Figure 2 and Figure 3 , the water droplets sprayed from the droplet spray pipe 21 can be more evenly distributed to the corrugated dust removal plate 22 after passing through the laminar water distribution plate 23, so as to ensure the dust removal effect of the dust removal and dehydration device;

[0056] When the dust-laden steam continues to move upward after passing through the flow gap, it will enter the laminar flow water distribution plate 23, where it will be centrally dusted and dehydrated.

[0057] Subsequently, the dust-laden steam after passing through the laminar water distribution plate 23 will continuously contact the water droplets sprayed from the droplet water spray pipe 21 during the process of flowing toward the droplet water spray pipe 21, and the dust removal and dehydration will be performed in the space between the laminar water distribution plate 23 and the droplet water spray pipe 21, so as to ensure the dust removal and dehydration effect of the water distribution purification and recovery system 2;

[0058] The clean steam after dust removal and dehydration can be discharged to the outside through the output end of the water distribution purification recovery system 2. This part of the clean steam can be used for recycling to achieve the recovery of heat energy. Of course, it can also be directly discharged into the atmosphere.

[0059] In some embodiments, the water distribution purification and recovery system 2 includes multiple groups of dehydration plates 24, see Figure 2 and Figure 3 ;

[0060] The dehydration plate 24 is located above the droplet spray pipe 21, and multiple groups of dehydration plates 24 are arranged in sequence along the first direction. In this embodiment, the cross-sectional shape of the dehydration plate 24 is a "V" shape, and the opening of the dehydration plate 24 faces the side of the hot slag tank 1, so that a curved channel is formed between two adjacent groups of dehydration plates 24. The clean steam can be dehydrated again when passing through the channel between the two groups of dehydration plates 24 to reduce the water content in the clean steam, thereby reducing the influence of the moisture in the clean steam on the relevant valves, pipelines and equipment in the recovery equipment.

[0061] In some embodiments, the water distribution purification and recovery system 2 includes a purification pipeline 25, see Figure 2 and Figure 3 ;

[0062] The purification pipeline 25 is arranged above the cavity 11, and the air inlet of the purification pipeline 25 is arranged toward the bottom of the cavity 11, and the exhaust port of the purification pipeline 25 passes through the side wall of the hot slag tank 1 and communicates with the outside;

[0063] The corrugated dust removal plate 22 and the laminar water distribution plate 23 are arranged in sequence in the air intake duct 25 from the air inlet of the purification duct 25 to the air outlet of the air intake duct 25. The droplet water spray pipe 21 and the dehydration plate 24 are arranged at the air outlet of the purification duct 25. The air outlet of the purification duct 25 passes through the side wall of the hot slag tank 1 and is connected to the outside; the dust-containing steam must pass through the corrugated dust removal plate 22, the laminar water distribution plate 23, the droplet water spray pipe 21 and the dehydration plate 24 in sequence before it can be discharged to the outside, thereby ensuring the dust removal and dehydration effect of the water distribution purification and recovery system 2.

[0064] In some embodiments, the dust removal and dehydration device also includes a red slag car 3 for transporting red-hot steel slag. The red slag car 3 can quickly transport the red-hot steel slag to the hot slag tank 1, or quickly send the cooled steel slag out of the hot slag tank 1 to improve the transportation efficiency of the steel slag.

[0065] In some embodiments, a drain outlet 31 is provided at the bottom of the red slag car 3. After the hot water is evenly sprayed on the red-hot slag, the unboiled water is discharged through the drain outlet 31 at the bottom of the red slag car 3, and is discharged to the water treatment workshop through the bottom of the hot slag tank 1, thereby avoiding the accumulation of water on the red slag car 3.

[0066] In some embodiments, a conveying track 13 is provided in the cavity 11;

[0067] The conveying track 13 is located below the water distribution purification and recovery system 2;

[0068] The red slag car 3 is provided with rollers, and the red slag car 3 is movably arranged on the conveying track 13 through the rollers to ensure that the red slag car 3 is directly below the water distribution purification and recovery system 2 to ensure the purification effect of the dust removal and dehydration device.

[0069] Based on the above-mentioned dust removal and dehydration device, this embodiment provides a dust removal and dehydration method, which is implemented by the above-mentioned dust removal and dehydration device, and the method includes the following steps:

[0070] The red-hot slag is fed into the cavity 11 of the hot slag tank 1 through the inlet and outlet, and the cover plate 12 is closed;

[0071] Starting the water distribution purification and recovery system 2, so that the water distribution purification and recovery system 2 sprays water droplets to the red-hot slag and generates dust-containing steam;

[0072] The dust-containing steam will increase the pressure in the cavity 11 and turn it into a pressurized environment. After the dust-containing steam is purified into pure steam by the water distribution purification and recovery system 2 in the pressurized environment, the pure steam is introduced into the gas-using equipment through the output end of the water distribution purification and recovery system 2 for recycling, or is discharged to the outside through the output end of the water distribution purification and recovery system 2.

[0073] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0074] 1) The water distribution, purification and recovery system 2 in the dust removal and dehydration device is arranged in the cavity 11 of the hot slag tank 1. When the water distribution, purification and recovery system 2 sprays water droplets to the red-hot slag, the density and pressure of the dust-containing steam in the cavity 11 increase rapidly, so that the dust-containing steam and the water droplets can contact in a pressurized environment, so as to improve the condensation and dehydration effects of the dust in the dust-containing steam, and there is no need to introduce multiple purification equipment for treatment, thereby effectively reducing the treatment cost of the dust-containing steam.

[0075] 2) The corrugated dust removal plate 22 is arranged below the droplet spray pipe 21. The water droplets sprayed from the droplet spray pipe 21 will form a water film on the surface of the corrugated dust removal plate 22 during the falling process, which can effectively rinse the corrugated dust removal plate 22 to ensure the service life and maintenance cycle of the water distribution purification and recovery system 2. At the same time, the water film on the surface of the corrugated dust removal plate 22 can also remove dust and cool and dehydrate the dust-containing steam in the flow gap, thereby effectively improving the dust removal and dehydration effect of the dust removal and dehydration device.

[0076] 3) The laminar water distribution plate 23 is arranged between the droplet water spray pipe 21 and the corrugated dust removal plate 22. The water droplets sprayed from the droplet water spray pipe 21 can be more evenly distributed to the corrugated dust removal plate 22 after passing through the laminar water distribution plate 23, so as to ensure the dust removal effect of the dust removal and dehydration device.

[0077] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A dust removal and dehydration device, characterized in that: It comprises a hot slag tank (1) and a water distribution purification and recovery system (2); An inlet and outlet communicating with a cavity (11) in the hot slag pot (1) are provided on one side of the hot slag pot (1); a cover plate (12) for closing the inlet and outlet is provided at the inlet and outlet; when the cover plate (12) is in a closed state, the cavity (11) is a closed space; The water distribution purification and recovery system (2) is arranged in the cavity (11), and the output end of the water distribution purification and recovery system (2) passes through the side wall of the hot slag pot (1) and is in communication with the outside.

2. The dust removal and dehydration device according to claim 1, characterized in that: The water distribution, purification and recovery system (2) comprises at least one set of droplet spray pipes (21) for distributing water to the red-hot slag in the cavity (11).

3. The dust removal and dehydration device according to claim 2, characterized in that: The water distribution purification and recovery system (2) also includes a plurality of groups of corrugated dust removal plates (22); A plurality of groups of the corrugated dust removal plates (22) are arranged in sequence along a first direction, the first direction forms an angle with a horizontal direction, and a curved flow gap is formed between two adjacent groups of the corrugated dust removal plates (22); The liquid droplet spray pipe (21) is arranged above the corrugated dust removal plate (22).

4. The dust removal and dehydration device according to claim 3, characterized in that: The water distribution, purification and recovery system (2) further comprises a laminar water distribution plate (23); The laminar water distribution plate (23) is arranged between the liquid droplet spray pipe (21) and the corrugated dust removal plate (22).

5. The dust removal and dehydration device according to claim 4, characterized in that: The water distribution, purification and recovery system (2) further comprises a plurality of groups of dehydration plates (24); A plurality of groups of dehydration plates (24) are arranged in sequence along a first direction; The dehydration plate (24) is located above the liquid drop spray pipe (21).

6. The dust removal and dehydration device according to claim 5, characterized in that: The water distribution purification and recovery system (2) comprises a purification pipeline (25); The purification pipeline (25) is arranged near the top of the cavity (11), and the air inlet of the purification pipeline (25) is arranged toward the bottom of the cavity (11), and the exhaust port of the purification pipeline (25) passes through the side wall of the hot slag pot (1) and communicates with the outside; The corrugated dust removal plate (22) and the laminar water distribution plate (23) are arranged in sequence in the purification pipe (25) from the air inlet of the purification pipe (25) to the air outlet of the purification pipe (25), the droplet water spray pipe (21) and the dehydration plate (24) are arranged at the air outlet of the purification pipe (25), and the air outlet of the purification pipe (25) passes through the side wall of the hot slag tank (1) and is connected to the outside.

7. The dust removal and dehydration device according to any one of claims 1 to 6, characterized in that: Also included is a red slag car (3) for transporting red-hot slag.

8. The dust removal and dehydration device according to claim 7, characterized in that: The bottom of the red slag car (3) is provided with a drainage outlet (31).

9. The dust removal and dehydration device according to claim 7, characterized in that: A conveying track (13) is arranged in the cavity (11); The conveying track (13) is located below the water distribution purification and recovery system (2); The red slag car (3) is provided with rollers, and the red slag car (3) is movably arranged on the conveying track (13) via the rollers.

10. A dust removal and dehydration method, characterized in that: The method is implemented by the dust removal and dehydration device according to any one of claims 1 to 9, and the method comprises the following steps: The red-hot slag is fed into the cavity (11) of the hot slag tank (1) through the inlet and outlet, and the cover plate (12) is closed; Starting the water distribution purification and recovery system (2) to allow the water distribution purification and recovery system (2) to spray water droplets onto the red-hot slag and generate dust-containing steam; The dust-containing steam will increase the pressure in the cavity (11) to create a pressurized environment. After the dust-containing steam is purified into pure steam by the water distribution purification and recovery system (2) in the pressurized environment, the pure steam is introduced into the gas-using equipment through the output end of the water distribution purification and recovery system (2) for recycling, or is discharged to the outside through the output end of the water distribution purification and recovery system (2).

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