Dry steel slag crushing and dust removal process system

Abstract

The utility model provides a kind of dry type steel slag crushing dedusting process system, it includes: crushing chamber, double medium atomizing spray gun group is equipped in the crushing chamber;Sedimentation chamber, at least part of the sedimentation chamber is located above the crushing chamber and is connected with the crushing chamber upper and lower communication;Dedusting pipeline, the dedusting pipeline is connected with the sedimentation chamber, and bag filter is equipped on the dedusting pipeline.The utility model can solve the problem that existing steel slag crushing dedusting process system cannot be adapted to bag dedusting process, simplify system structure using bag dedusting technology, reduce investment cost, improve flue gas dedusting efficiency simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting technology, and in particular to a dry steel slag crushing and dust removal process system. Background Technology

[0002] Steel slag is a major byproduct of steelmaking, accounting for 10% to 15% of steel production. The resource utilization of steel slag has a broad market prospect. Roller crushing-hot quenching is an advanced steel slag resource utilization process. Current technologies achieve ultra-low emission requirements by employing either closed-loop cold air circulation with waste heat recovery for cooling and dust removal, or wet dust removal.

[0003] The closed-loop cold air circulation and waste heat recovery cooling system uses a multi-tube dust removal system to treat the dust-laden flue gas generated during the roller crushing process. The waste heat boiler is used to cool the flue gas. During the flue gas circulation process, the dust content continuously increases, causing severe wear to the supporting fan, boiler inner wall, and connecting pipes, which affects the service life of the system.

[0004] Wet dust removal processes often involve the use of scrubbing towers. Wet dust removal technology can only reduce the dust content in emitted flue gas to 50 mg / m³. 3 It requires the use of secondary dust removal facilities, such as wet electrostatic precipitators, to achieve ultra-low emissions (10mg / m³). 3 )Require.

[0005] Baghouse dust collectors are currently the most efficient and stable dust removal equipment, capable of consistently achieving ultra-low emissions. However, due to the closed-loop cold air circulation and waste heat recovery process, the flue gas temperature often reaches 350℃~400℃, which can cause bag burning when using a baghouse dust collector; wet dust collectors have a water cooling process at the front end, resulting in high moisture content in the flue gas, which can cause bag clogging when using a baghouse dust collector; neither of these two processes is compatible with baghouse dust collectors.

[0006] Chinese utility model patent CN212383424U discloses an ultra-low emission system for flue gas in steel slag treatment, comprising three parts: a dust collection hood, a spray scrubbing tower, and a high-efficiency dust collector. The treated flue gas, meeting emission standards, is then discharged through a chimney. However, it suffers from the following technical problems: 1. The scrubbing tower dust removal technology can only reduce the dust content of the emitted flue gas to 50-100 mg / m³. 3 Within this range, ultra-low emissions (dust content ≤10mg / m³) must be achieved by using a series wet electrostatic precipitator. 3 The system has several drawbacks: 1) High initial investment and maintenance costs. 2) High moisture content in the flue gas can corrode fan blades, affecting fan lifespan; high moisture content also increases flue gas density, requiring higher fan power and resulting in high system energy consumption. 3) The collected dust is a water-dust mixture, making subsequent dust collection and treatment difficult. 4) High water consumption necessitates the use of a water pump, increasing investment and energy consumption.

[0007] Chinese invention patent application CN120330399A discloses a dry treatment system for steel slag and a full-process waste heat recovery technology. It employs closed-loop cold air circulation and waste heat recovery technology to cool the equipment, and uses a circulating fan to carry the heat from the steel slag out for steam recovery in a waste heat boiler. This process uses a multi-tube dust collector to treat dust in the flue gas, and then uses the waste heat boiler to cool the flue gas before blowing it into the granulator, forming a closed loop. However, it has the following technical problems: 1. A large number of devices and a high initial investment. Although the system can utilize waste heat to generate steam, the payback period is long compared to the initial investment. 2. The multi-tube dust collector has a low dust removal capacity, and the dust content in the circulating air gradually increases, causing significant wear and tear on the flue and equipment, affecting the equipment's service life. 3. The dust content in the flue gas at the circulating fan is 500 mg / m³. 3 The system experiences significant wear and tear on the fan casing and blades. Flue gas temperatures typically range from 350 to 400°C, with large volumes of flue gas, requiring high fan power and resulting in high system energy consumption. 4. The system has a significant impact on upstream main processes. As it operates in a closed-loop system, a failure in any part of the equipment renders the entire system unusable, halting upstream production. Utility Model Content

[0008] The purpose of this invention is to provide a dry steel slag crushing and dust removal process system to solve the above-mentioned technical problems, simplify the system structure, reduce investment costs, and improve flue gas dust removal efficiency.

[0009] The above-mentioned technical objectives of this utility model are mainly achieved through the following technical solutions.

[0010] This utility model provides a dry steel slag crushing and dust removal process system, which includes:

[0011] The crushing chamber is equipped with a dual-media atomizing spray gun assembly;

[0012] A settling chamber, at least a portion of which is located above and vertically connected to the crushing chamber;

[0013] A dust removal pipeline is connected to the settling chamber, and a bag filter is installed on the dust removal pipeline.

[0014] In a preferred embodiment of this utility model, the multiple dual-media atomizing spray guns in the dual-media atomizing spray gun group are all connected to water pipes and compressed air pipes, and a settling chamber temperature sensor is provided in the settling chamber; the opening degree of the water pipe and the opening degree of the compressed air pipe are configured to be adjusted based on the flue gas temperature in the settling chamber monitored by the settling chamber temperature sensor, so as to dynamically adjust the flue gas temperature in the settling chamber.

[0015] In a preferred embodiment of this utility model, a bag filter temperature sensor and a mixing valve are provided on the pipeline between the bag filter and the settling chamber. When the bag filter temperature sensor detects that the flue gas temperature in the dust collection pipeline exceeds a predetermined threshold, the mixing valve opens to draw air into the dust collection pipeline.

[0016] In a preferred embodiment of the present invention, a dust removal fan and a chimney are also provided on the dust removal pipeline downstream of the bag filter.

[0017] In a preferred embodiment of the present invention, a settling chamber ash silo is provided at the bottom of the settling chamber, and the settling chamber ash silo is connected to a centralized ash silo through a first dust collection pipeline, and a settling chamber silo pump is provided on the first dust collection pipeline.

[0018] In a preferred embodiment of the present invention, the bottom of the bag filter is connected to the centralized ash silo via a second dust collection pipeline, and the second dust collection pipeline is equipped with a bag filter silo pump.

[0019] In a preferred embodiment of the present invention, the settling chamber is further provided with a high-temperature scraper conveyor for conveying dust particles to the ash silo of the settling chamber.

[0020] In a preferred embodiment of the present invention, the dry steel slag crushing and dust removal process system has a granulator dust hood, and the granulator dust hood is provided with a connected top partition plate and a side partition plate to divide the internal space of the granulator dust hood into the crushing chamber and the settling chamber. The top partition plate is provided with a flue gas hole that connects the crushing chamber and the settling chamber.

[0021] In a preferred embodiment of this invention, the top partition plate is inclined downward along the flow direction of the flue gas in the settling chamber.

[0022] In a preferred embodiment of this utility model, the high-temperature scraper conveyor is located on the upper side of the top partition plate, and the settling chamber ash hopper is located between the side partition plate and the side wall of the granulator dust collector hood.

[0023] Compared with the prior art, the technical solution of this utility model has the following features and advantages:

[0024] 1. It adopts baghouse dust collection technology, which has high dust removal efficiency, and the dust content at the dust collector outlet can be kept stable at 10mg / m³ for a long period of time. 3 the following

[0025] 2. The dust removal fan is located at the rear end of the bag filter, resulting in low dust content in the flue gas; the system temperature is controlled within the range of 150℃~250℃, the moisture content of the flue gas is 0, the fan load is small, and the system energy consumption is low.

[0026] 3. The front-end cooling adopts atomized evaporative cooling method, which consumes little water, does not produce wastewater, and has low energy medium requirements.

[0027] 4. No condensate is generated during the system's cooling and dust removal process; the collected dust is all dry ash, which can be conveyed by pneumatic means, making it environmentally friendly and convenient.

[0028] 5. The system requires fewer devices, occupies less space, and requires less investment. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0030] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0031] Figure 1 This is a schematic diagram of the dry steel slag crushing and dust removal process system described in this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Granulator dust hood; 11. Top partition plate; 12. Side partition plate; 13. Crushing chamber; 14. Settling chamber;

[0034] 20. Water pipes; 21. Compressed air pipes; 22. Dual-media atomizing spray guns;

[0035] 30. Settling chamber temperature sensor; 31. High-temperature scraper conveyor; 32. Settling chamber ash silo; 33. First dust collection pipeline; 34. Settling chamber silo pump; 35. Centralized ash silo;

[0036] 40. Dust collection pipeline; 41. Mixing valve; 42. Baghouse dust collector temperature sensor; 43. Baghouse dust collector; 44. Dust collection fan; 45. Chimney; 46. Second dust collection pipeline; 47. Baghouse dust collector hopper pump. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0038] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] This utility model provides a dry steel slag crushing and dust removal process system, such as Figure 1 As shown, it includes: a crushing chamber 13, which is equipped with a dual-media atomizing spray gun assembly; a settling chamber 14, at least part of which is located above the crushing chamber 13 and is vertically connected to the crushing chamber 13; and a dust removal pipeline 40, which is connected to the settling chamber 14 and is equipped with a bag filter 43.

[0041] The dry steel slag crushing and dust removal process system described in this utility model employs atomized evaporative cooling at the front end, resulting in low water consumption, no wastewater generation, and minimal energy requirements. At the rear end, it utilizes baghouse dust collection technology, achieving high dust removal efficiency, with the dust concentration at the dust collector outlet remaining stably at 10 mg / m³ over a long period. 3 The system generates no condensate during cooling and dust removal; the collected dust is all dry ash, which can be conveyed pneumatically, making it environmentally friendly and convenient. The entire system requires minimal equipment, occupies a small area, and has low investment costs.

[0042] The following will provide a detailed description of the specific structure of each part of the dry steel slag crushing and dust removal process system described in this utility model, as well as the position and connection relationship between each part.

[0043] The dry steel slag crushing and dust removal process system has a crushing chamber 13 and a settling chamber 14 that are connected to each other. The crushing chamber 13 is equipped with a granulator for crushing steel slag. During the operation of the granulator, dust-laden flue gas is generated, which can enter the settling chamber 14 for preliminary settling.

[0044] In this embodiment, as Figure 1 As shown, the outer cover of the granulator is equipped with a granulator dust hood 10. Inside the granulator dust hood 10, there is a connected top partition plate 11 and side partition plates 12. The top partition plate 11 and side partition plates 12 divide the internal space of the granulator dust hood 10 into a crushing chamber 13 and a settling chamber 14. The top partition plate 11 has flue gas vents connecting the crushing chamber 13 and the settling chamber 14. The structure of the granulator dust hood 10 and partition plates provided in this embodiment is only one form for forming the corresponding crushing chamber 13 and settling chamber 14, but it is not limited to this.

[0045] Furthermore, such as Figure 1 As shown, the crushing chamber 13 is equipped with a dual-media atomizing spray gun assembly, which has multiple dual-media atomizing spray guns 22, each located above the granulator. Each dual-media atomizing spray gun 22 is connected to a water pipe 20 and a compressed air pipe 21. Under the action of compressed air, water is atomized and sprayed out from the outlet of the spray gun to cool the flue gas in the crushing chamber 13, while simultaneously agglomerating dust and carrying it upward through the flue gas vent into the settling chamber 14.

[0046] Inside settling chamber 14, such as Figure 1 As shown, large dust particles that have clumped together settle in the settling chamber 14 under the action of gravity; a high-temperature scraper 31 is provided in the settling chamber 14, and the high-temperature scraper 31 is fixedly installed on the upper side of the top partition plate 11. The high-temperature scraper 31 is used to transport the large dust particles after settling.

[0047] Furthermore, such as Figure 1 As shown, a settling chamber ash hopper 32 is located at the bottom of the settling chamber 14, between the side partition 12 and the side wall of the granulator dust collector hood 10. The settling chamber ash hopper 32 is connected to the centralized ash hopper 35 via a first dust collection pipeline 33, on which a settling chamber hopper pump 34 is installed. A high-temperature scraper conveyor 31 conveys dust particles to the settling chamber ash hopper 32, and under the action of the settling chamber hopper pump 34, the dust particles stored in the settling chamber ash hopper 32 are transported to the centralized ash hopper 35 through the first dust collection pipeline 33.

[0048] The dry steel slag crushing and dust removal process system also has a dust removal pipeline 40 connected to the settling chamber 14. The dust removal pipeline 40 is used for secondary dust removal of the flue gas after cooling and initial settling.

[0049] In this embodiment, as Figure 1As shown, a bag filter 43, a dust removal fan 44, and a chimney 45 are sequentially installed on the dust removal pipeline 40. After passing through the settling chamber 14, the flue gas enters the bag filter 43 for secondary dust removal, and the purified flue gas enters the chimney 45 for discharge through the dust removal fan 44.

[0050] Furthermore, such as Figure 1 As shown, the bottom of the bag filter 43 is connected to the centralized ash silo 35 via a second dust collection pipeline 46, and a bag filter silo pump 47 is installed on the second dust collection pipeline 46. Under the action of the bag filter silo pump 47, the dust collected in the bag filter 43 can be collected into the centralized ash silo 35 through the second dust collection pipeline 46.

[0051] The following will further explain the structure and technical effects of the preferred embodiment of the dry steel slag crushing and dust removal process system of this utility model.

[0052] According to one embodiment of the present invention, such as Figure 1 As shown, a settling chamber temperature sensor 30 is provided in the settling chamber 14; the opening of the water pipe 20 and the opening of the compressed air pipe 21 are configured to be adjusted based on the flue gas temperature in the settling chamber 14 monitored by the settling chamber temperature sensor 30, so as to dynamically adjust the flue gas temperature in the settling chamber 14 and keep the flue gas temperature in the settling chamber 14 within a predetermined range.

[0053] Specifically, when the settling chamber temperature sensor 30 detects that the flue gas temperature in the settling chamber 14 is too high, the opening of the water pipe 20 and the compressed air pipe 21 is increased, resulting in more atomized water entering the crushing chamber 13, thereby reducing the flue gas temperature; when the settling chamber temperature sensor 30 detects that the flue gas temperature in the settling chamber 14 is too low, the opening of the water pipe 20 and the compressed air pipe 21 is decreased, resulting in less atomized water entering the crushing chamber 13, thereby preventing excessive humidity in the flue gas and the generation of condensate.

[0054] According to one embodiment of the present invention, such as Figure 1 As shown, a bag filter temperature sensor 42 and a mixing valve 41 are installed on the pipeline between the bag filter 43 and the settling chamber 14. When the bag filter temperature sensor 42 detects that the flue gas temperature in the dust collection pipeline 40 exceeds a predetermined threshold, the mixing valve 41 opens to draw air into the dust collection pipeline 40. That is, when the flue gas temperature in the dust collection pipeline 40 is too high, the mixing valve 41 opens, and air enters the dust collection pipeline 40 to cool the flue gas and prevent the filter bags from spontaneously combusting due to the high temperature of the flue gas.

[0055] According to one embodiment of the present invention, such as Figure 1 As shown, the top partition plate 11 is inclined downward along the flow direction of the flue gas in the settling chamber 14, so as to facilitate the collection of the flue dust particles settled in the settling chamber 14 to the settling chamber ash hopper 32 at the bottom of the settling chamber 14.

[0056] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dry steel slag crushing and dust removal process system, characterized in that, include: The crushing chamber (13) is equipped with a dual-medium atomizing spray gun assembly. Settling chamber (14), at least a portion of which is located above and vertically connected to the crushing chamber (13); A dust removal pipeline (40) is connected to the settling chamber (14), and a bag filter (43) is provided on the dust removal pipeline (40).

2. The dry steel slag crushing and dust removal process system according to claim 1, characterized in that, The multiple dual-media atomizing spray guns (22) in the dual-media atomizing spray gun group are all connected to water pipes (20) and compressed air pipes (21). A settling chamber temperature sensor (30) is provided in the settling chamber (14). The opening of the water pipe (20) and the opening of the compressed air pipe (21) are configured to be adjusted based on the flue gas temperature in the settling chamber (14) monitored by the settling chamber temperature sensor (30) in order to dynamically adjust the flue gas temperature in the settling chamber (14).

3. The dry steel slag crushing and dust removal process system according to claim 1 or 2, characterized in that, A bag filter temperature sensor (42) and a mixing valve (41) are installed on the pipeline between the bag filter (43) and the settling chamber (14). When the bag filter temperature sensor (42) detects that the flue gas temperature in the dust removal pipeline (40) exceeds a predetermined threshold, the mixing valve (41) opens to draw air into the dust removal pipeline (40).

4. The dry steel slag crushing and dust removal process system according to claim 1, characterized in that, Downstream of the bag filter (43), a dust removal fan (44) and a chimney (45) are also provided on the dust removal pipeline (40).

5. The dry steel slag crushing and dust removal process system according to claim 1, characterized in that, The bottom of the settling chamber (14) is provided with a settling chamber ash silo (32), which is connected to a centralized ash silo (35) through a first dust collection pipeline (33). A settling chamber silo pump (34) is provided on the first dust collection pipeline (33).

6. The dry steel slag crushing and dust removal process system according to claim 1 or 5, characterized in that, The bottom of the bag filter (43) is connected to the centralized ash silo (35) through the second dust collection pipeline (46), and the second dust collection pipeline (46) is equipped with a bag filter silo pump (47).

7. The dry steel slag crushing and dust removal process system according to claim 5, characterized in that, The settling chamber (14) is also equipped with a high-temperature scraper (31) for conveying dust particles to the ash silo (32) of the settling chamber.

8. The dry steel slag crushing and dust removal process system according to claim 7, characterized in that, The dry steel slag crushing and dust removal process system has a granulator dust hood (10). The granulator dust hood (10) is provided with a connected top partition plate (11) and a side partition plate (12) to divide the internal space of the granulator dust hood (10) into the crushing chamber (13) and the settling chamber (14). The top partition plate (11) is provided with a flue gas hole that connects the crushing chamber (13) and the settling chamber (14).

9. The dry steel slag crushing and dust removal process system according to claim 8, characterized in that, Along the flow direction of the flue gas in the settling chamber (14), the top partition plate (11) is inclined downward.

10. The dry steel slag crushing and dust removal process system according to claim 8, characterized in that, The high-temperature scraper conveyor (31) is located on the upper side of the top partition plate (11), and the settling chamber ash hopper (32) is located between the side partition plate (12) and the side wall of the granulator dust collector hood (10).

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