Dustproof structure of air quenching system

Abstract

The dustproof structure of the air quenching system is provided with a dustproof cover, an air inlet is formed in the bottom of the dustproof cover, an air outlet is formed in the top of the dustproof cover, an n-shaped enclosure wall is arranged behind the air inlet, a slag blowing hole is formed in the inner side of the enclosure wall, and a heat preservation layer is arranged on the inner side of the enclosure wall; a dust collection device is connected with an air outlet of the dust cover; a ventilation opening with the adjustable ventilation degree is further formed in the top of the dustproof cover. The dust cover has the following beneficial effects that the dust cover can effectively prevent dust from escaping, so that dust pollution is effectively inhibited. The dust suction device sucks dust-contained gas from an air outlet in the top of the dust cover. Due to the fact that the ventilation opening with the adjustable ventilation degree is formed in the top of the dustproof cover, operators can flexibly adjust the ventilation degree according to actual working conditions. The heat preservation layer on the inner side of the surrounding wall of the slag blowing hole can effectively reduce heat loss, the high-temperature environment in the slag blowing hole is maintained, and the situation that the steel slag is solidified in advance due to cold before being blown away by high-pressure airflow is avoided.

Description

Technical Field

[0001] This invention relates to the field of air quenching technology, and more specifically to the dustproof structure of an air quenching system. Background Technology

[0002] The air quenching system includes a slag container, a slag pouring mechanism, a slag trough, nozzles, and a blower that provides high-pressure airflow to the nozzles, with the nozzles positioned at the front of the slag trough. The slag pouring mechanism drives the slag container to tilt, pouring the slag into the slag trough. The slag flows forward along the trough to its front end, where it is dispersed into fine slag particles by the high-pressure airflow from the nozzles. Because some of the slag is atomized into fine particles by the high-pressure airflow during air quenching, dust is generated, which can easily cause environmental pollution. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a dustproof structure for an air quenching system, which can effectively suppress dust pollution.

[0004] To solve the above-mentioned technical problems, the dustproof structure of the air quenching system of the present invention is provided with a dustproof cover, an air inlet at the bottom and an air outlet at the top, a "door"-shaped enclosure behind the air inlet, a slag blowing hole formed on the inner side of the enclosure for the slag trough and nozzle to extend into, thereby blowing the steel slag forward into the dustproof cover, and an insulation layer on the inner side of the enclosure; a dust suction device is provided connected to the air outlet of the dustproof cover; and an adjustable ventilation opening is provided on the top of the dustproof cover.

[0005] Furthermore, the dust cover is hinged to the top with a cover plate that covers the vent; a drive mechanism is provided that drives the cover plate to rotate, changing the degree of opening of the cover plate and thus adjusting the ventilation level of the vent.

[0006] Furthermore, there are at least two ventilation openings, one on the left and one on the right, located on the left and right sides of the air outlet, respectively.

[0007] Furthermore, the vertical cross-section of the top of the dust cover is an isosceles trapezoid that is narrower at the top and wider at the bottom. The air outlet is located on the top edge of the isosceles trapezoid, and the air outlets are located on the left and right sides of the isosceles trapezoid.

[0008] Furthermore, there are multiple air outlets arranged side by side, and the vacuuming device includes a vacuum fan and a vacuum hose that is wider at the front and narrower at the back. The vacuum fan is connected to the front end of the vacuum hose, which is mounted on the top of the dust cover and connected to multiple air outlets in sequence from back to front.

[0009] Furthermore, the vacuum hose has a gradient section that is wider at the front and narrower at the back, with the front air outlet connected to the gradient section of the vacuum hose.

[0010] Furthermore, the dust cover sidewall includes a frame and transverse steel plates mounted on the frame, with a transverse gap between each pair of adjacent transverse steel plates, and a transverse baffle is provided to block the transverse gap.

[0011] Furthermore, the transverse baffle is welded only to one of the transverse steel plates, without being welded to the other transverse steel plate.

[0012] Furthermore, the dust collection device includes a bag filter, with a spark arrester connected to the air inlet end of the bag filter.

[0013] Furthermore, a dust conveying device is provided, with the feed end of the dust conveying device aligned with the dust outlet of the bag filter, and the discharge end extending into the dust cover to send the dust collected by the bag filter into the dust cover.

[0014] This invention offers the following advantages: The nozzle blows steel slag into the dust cover. Even if some slag is atomized into tiny particles by the high-pressure airflow during air quenching, generating dust, the dust cover effectively prevents dust from escaping, thus effectively suppressing dust pollution. A dust extraction device draws away dust-laden gas from the exhaust vent at the top of the dust cover. Because the top of the dust cover has adjustable ventilation openings, operators can flexibly adjust the ventilation level according to actual working conditions. For example, during air quenching, when the gas temperature inside the dust cover rises, the ventilation level can be increased to introduce cool outside air. The cool outside air mixes with the high-temperature gas inside the dust cover before entering the dust extraction device, preventing malfunction due to the extraction of overheated gas. Alternatively, after air quenching, the ventilation openings can be opened to enhance ventilation and promote slag cooling. The insulation layer inside the slag blowing tunnel effectively reduces heat loss and maintains a high-temperature environment inside the tunnel, preventing the steel slag from solidifying prematurely due to cooling before being dispersed by the high-pressure airflow. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an air quenching system, with a cover plate covering the vent.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of the image, showing a larger area. Figure 1 Part A.

[0017] Figure 3 This is a schematic diagram of the air quenching nozzle blowing steel slag into the dust cover.

[0018] Figure 4 This is a schematic diagram of the air quenching system, with the cover plate rotated open.

[0019] Figure 5 yes Figure 4 A magnified view of a portion of the image, showing a larger area. Figure 4 Part B.

[0020] Figure 6 This is a schematic diagram of a dust collection device and a dust conveying device.

[0021] Figure 7This is a schematic diagram of another embodiment of the gas conveying ash unit sending the dust stored in the dust temporary storage bin to the dust cover.

[0022] Figure 8 This is a schematic diagram of a set of steel plates, which are drawn using a fractured method. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments.

[0024] See air quenching system Figure 1 and Figure 3 The system includes a dust cover 1, with an air inlet 11 at the bottom of the rear wall. Behind the air inlet 11 is a "door"-shaped enclosure 18, with a slag blowing hole 181 formed on the inner side of the enclosure 18. An insulation layer 182 is provided on the inner side of the enclosure 18. In this embodiment, the insulation layer 182 is made of existing ceramic fiberboard; in other embodiments, other existing insulation materials can be used, such as aluminum silicate fiberboard or refractory fiber felt. Behind the slag blowing hole 181 are a slag holding tank 21, a slag dumping mechanism 22, and a slag trough 23. The front end 231 of the slag trough 23 extends forward into the slag blowing hole 181. The air quenching system includes an air quenching nozzle 24 and a high-pressure blower 25 that provides high-pressure airflow to the air quenching nozzle 24. The air quenching nozzle 24 extends into the slag blowing hole 181, facing forward and upward towards the front end 231 of the slag trough 23, which is also aligned with the air inlet 11 of the dust cover 1. The slag holding tank 21, the slag dumping mechanism 22, the slag trough 23, the air quenching nozzle 24, and the high-pressure blower 25 are all existing technologies. The operator controls the slag dumping mechanism 22 to drive the slag holding tank 21 to dump the slag into the slag trough 23. The air quenching nozzle 24 sprays high-pressure airflow towards the front end 231 of the slag trough 23. The high-pressure airflow blows the slag flowing to the front end 231 of the slag trough 23 forward into the dust cover 1. During this process, the slag is dispersed into slag particles by the high-pressure airflow. The slag particles fall onto the ground inside the dust cover 1 under gravity and gradually cool. The insulation layer 182 inside the wall 18 of the slag blowing hole 181 effectively reduces heat loss and maintains a high-temperature environment inside the slag blowing hole 181, preventing the slag from solidifying prematurely due to cooling before being dispersed by the high-pressure airflow.

[0025] Because some steel slag is atomized into fine particles by high-pressure airflow during air quenching, thus generating dust, see [the relevant documentation]... Figure 1 and Figure 3 This air quenching system has four air outlets 12 arranged side-by-side at the center of the top 10 of the dust cover 1, and is also equipped with a dust suction device 3. During the air quenching process, the dust suction device 3 sucks away the dust-laden gas inside the dust cover 1 from the air outlets 12 at the top 10 of the dust cover 1. Two pairs of ventilation openings 13 are provided on the left and right sides of the air outlets 12 respectively. Figure 3Due to the viewing angle, only the right-hand vent 13 is shown. Each vent 13 is equipped with a cover plate 41, which is hinged to the top 10 of the dust cover 1. The top 10 of the dust cover 1 also provides a drive mechanism for each cover plate 41; in this embodiment, it is a cylinder 42 (other embodiments may use other drive mechanisms such as an electric telescopic rod). See [link to documentation]. Figure 2 The cylinder 42 body 421 is hinged to the top 10 of the dust cover 1, and the cylinder 42 drive rod 422 extends upward and is hinged to the cover plate 41. The cover plate 41 normally covers the vent 13 to seal the vent 13.

[0026] The operator can flexibly adjust the opening degree of the cover plate 41 according to the actual working conditions to regulate the ventilation degree of the vent 13. An example is given below.

[0027] (1) During the air quenching process, when the gas temperature inside the dust cover 1 rises, the control cylinder 42 drives the rod 422 to retract downwards, as shown in the figure. Figure 2 The drive cover 41 shown rotates upwards to open, thereby increasing the ventilation of the vent 13. After opening, as... Figure 4 and Figure 5 As shown, cold outside air is introduced in this way. The cold outside air mixes with the high-temperature gas inside the dust cover 1 before entering the dust collection device 3, thus preventing the dust collection device 3 from malfunctioning due to the intake of overheated gas.

[0028] Or (2) after the air quenching operation is completed, especially when the dust collection device 3 is turned off or under maintenance, the control cylinder 42 drive rod 422 retracts downwards, such as Figure 2 The drive cover 41 shown rotates upwards to open, thereby opening the vent 13. After opening, as... Figure 4 and Figure 5 As shown, the ventilation effect of the dust cover 1 is enhanced, which promotes the cooling of slag particles.

[0029] See Figure 4 and Figure 5 In (1) above, the operator judges the temperature change trend of the gas inside the dust cover 1 based on experience and adjusts the ventilation level of the vent 13 accordingly. For example, in the early stage of air quenching, the gas inside the dust cover 1 gradually rises from a lower temperature, at which time the ventilation level of the vent 13 can be gradually increased; when the air quenching process is close to halfway, the temperature inside the cover reaches a higher level, at which time the ventilation level of the vent 13 should be adjusted to the maximum; after the air quenching is completed, the temperature inside the cover gradually decreases, and the ventilation level of the vent 13 can be gradually reduced until the vent 13 is completely closed. In other embodiments, a temperature sensor is installed at the top inside the dust cover 1 to detect the gas temperature inside the cover, and the operator dynamically adjusts the ventilation level of the vent 13 according to the detection results of the temperature sensor.

[0030] See Figure 3 and Figure 5The vertical cross section of the top 10 of the dust cover 1 is an isosceles trapezoid that is narrow at the top and wide at the bottom. The air outlet 12 is located in the middle of the top 10 of the dust cover 1, that is, on the top edge of the isosceles trapezoid. The ventilation openings 13 are located on the left and right sides of the air outlet 12, that is, on the left and right sides of the isosceles trapezoid.

[0031] See Figure 1 and Figure 6 The vacuuming device 3 includes front and rear suction pipes 31, and a conventional bag filter 32, which is located on the left side of the dust cover 1. The vacuuming device 3 also includes a spark arrester 35, which is existing technology. The suction pipes 31 are mounted in the center of the top 10 of the dust cover 1, located at the four air outlets 12 (see...). Figure 3 Above, from back to front, are four air outlets 12 (see above). Figure 3 The front end 311 of the suction pipe 31 is connected to the air inlet of the spark arrester 35, the air outlet of the spark arrester 35 is connected to the air inlet of the bag filter 32, and the air outlet of the bag filter 32 is connected to the suction fan 36. The bag filter 32 has a bag dust collection structure inside (not shown in the figure), and the bottom of the bag filter 32 has a receiving hopper 321.

[0032] See Figure 1 and Figure 6 When the dust collection device 3 is working, the dust collection fan 36 indirectly draws air from the dust cover 1's outlet 12 (see...) via the bag filter 32, spark arrester 35, and suction pipe 31. Figure 3 The dust-laden gas inside the dust cover 1 is sucked away. This dust-laden gas first flows along the suction pipe 31 to the spark arrester 35, where sparks in the dust-laden gas are extinguished. After the sparks are extinguished, the dust-laden gas flows from the spark arrester 35 to the bag filter 32. The dust in the gas is filtered by the bag filter structure in the bag filter 32 and then collected by the receiving hopper 321. The filtered gas enters the suction fan 36 from the bag filter 32 and is then discharged to the outside.

[0033] See Figure 6The receiving hopper 321 has a dust outlet pipe 322 and a valve 323 at its bottom dust outlet. A dust conveying device is located below the dust outlet pipe 322. In this embodiment, the valve 323 is an electric rotary valve, and the dust conveying device includes a scraper conveyor 5. Both of these are existing technologies. The dust outlet pipe 322 is aligned with the feed end 51 of the scraper conveyor 5. The dust conveying device also includes a dust storage bin 6, which is connected to the discharge end 52 of the scraper conveyor 5. The operator cleans the dust periodically: first, the dust extraction fan 36 is turned off, and then the valve 323 is opened to allow the dust collected in the receiving hopper 321 to fall onto the scraper conveyor 5 through the dust outlet pipe 322. The scraper conveyor 5 then transports the dust to the dust storage bin 6 for storage. Every so often, the operator packs and removes the dust stored in the dust storage bin 6. The dustproof structure of the air quenching system consists of a dust cover 1, a dust suction device 3, a cover plate 41, a cylinder 42, and a dust conveying device.

[0034] The dust mainly consists of fine steel slag particles, which have high recycling value. Other embodiments can be modified as follows: see Figure 7 A recovery port 101 is opened on the dust cover 1. The dust conveying device also includes a gas ash conveying unit 7, which is existing technology. Its feed end 71 is connected to the discharge port at the bottom of the dust storage bin 5, and its discharge end 72 extends into the dust cover 1 through the recovery port 101. After the air quenching operation is completed, the gas ash conveying unit 7 is activated to send the dust stored in the dust storage bin 6 back into the dust cover 1, where it is mixed and piled together with the cooled slag particles on the ground, realizing on-site utilization of materials and reducing resource waste. Other embodiments can use other ash conveying units, such as spiral ash conveying units, etc.

[0035] See Figure 3 The suction pipe 31 has three parallel tapered sections 315, each designed as a tapered structure that is wider at the front and narrower at the back. Each tapered section 315 gradually narrows from front to back, resulting in an overall shape that is wider at the front and narrower at the back of the suction pipe 31. The three front air outlets 12 of the top 10 of the dust cover 1 are connected to these three tapered sections 315 respectively. The gas discharged from the four air outlets 12 flows sequentially into the suction pipe 31 from back to front. The suction pipe 31's design of being wider at the front and narrower at the back serves two purposes: firstly, it matches the gradually increasing airflow from back to front, ensuring that the flow area of ​​each section is coordinated with the airflow load, which is beneficial for smooth airflow convergence; secondly, the larger cross-section of the front section 317 of the suction pipe 31 allows for a large flow of gas, reducing airflow resistance, while the gradually narrowing structure ensures sufficient airflow velocity in the rear section 318 of the suction pipe 31, effectively preventing dust from accumulating in the rear section 318.

[0036] See Figure 1 and Figure 8The bottom of the dust cover 1 is a concrete wall 15, and a steel structure frame 16 is fixedly installed on the concrete wall 15. Multiple sets of steel plates 17 are installed on the frame 16. Each set consists of three horizontal steel plates 171, 172, and 173 arranged side by side, which are installed on the frame 16 respectively. In each group of steel plates 17: a first transverse gap 174 is left between the upper transverse steel plate 171 and the middle transverse steel plate 172. A first transverse baffle 175 is welded to the outer side of the upper end of the middle transverse steel plate 172, blocking the first transverse gap 174. The first transverse baffle 175 is not welded to the upper transverse steel plate 171. A second transverse gap 176 is left between the middle transverse steel plate 172 and the lower transverse steel plate 173. A second transverse baffle 177 is welded to the outer side of the upper end of the lower transverse steel plate 173, blocking the second transverse gap 176. The second transverse baffle 177 is not welded to the middle transverse steel plate 172. During the air quenching process, the temperature inside the dust cover 1 rises, and the steel plates 171, 172, and 173 expand due to heat, allowing them to extend vertically towards the transverse gaps 174 and 176, effectively releasing thermal stress. Since the transverse baffles 175 and 177 block the transverse gaps 174 and 176, molten or solid slag particles can be prevented from flying out of the protective cover 1 through the transverse gaps 174 and 176. Furthermore, since the first transverse baffle 175 is not welded to the central transverse steel plate 172, the first transverse baffle 175 does not fix the upper transverse steel plate 171 and the central transverse steel plate 172 together, thus not affecting the vertical extension of these two transverse steel plates 171 and 172 towards the first transverse gap 174. Similarly, the second transverse baffle 177 does not affect the vertical extension of the two transverse steel plates 172 and 173 towards the second transverse gap 176, and will not be elaborated further. In this embodiment, the steel plate 17 is installed onto the frame 16 using a conventional suspension method. For example, an elliptical mounting hole is drilled in the steel plate 17, and screws are passed through the mounting hole to fix it onto the frame 16. This method of suspending the steel plate 17 onto the frame 16 provides expansion and contraction space for the steel plate 17 when heated, effectively accommodating thermal deformation. Other embodiments may use other conventional installation methods, such as bolt installation, which will not be elaborated upon here.

[0037] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A dust-proof structure of a wind-quenching system, characterized by comprising: The dust cover is provided with an air inlet at the bottom and an air outlet at the top, and a "door" type wall is arranged behind the air inlet. The wall is provided with a blowing hole on the inner side for the slag chute and the nozzle to extend into, so as to blow the steel slag forward into the dust cover. The inner side of the wall is provided with a heat preservation layer. A dust suction device is connected to the air outlet of the dust cover. The dust cover is further provided with a ventilating opening with adjustable ventilation degree.

2. The dust-proof structure of the air quenching system according to claim 1, characterized in that: The dust cover is provided with a driving mechanism to drive the cover plate to rotate and change the opening degree of the cover plate, so as to adjust the ventilation degree of the ventilating opening.

3. The dust-proof structure of the air quenching system according to claim 1, characterized in that: The ventilating opening is provided with at least left and right two openings respectively arranged on the left and right sides of the air outlet.

4. The dust-proof structure of the air quenching system according to claim 3, characterized in that: The vertical section of the top of the dust cover is an isosceles trapezoid with a narrow top and a wide bottom. The air outlet is arranged on the top side of the isosceles trapezoid, and the left and right sides of the isosceles trapezoid are respectively provided with air outlets.

5. The dust-proof structure of a wind-quenching system according to claim 1, wherein: The air outlet is provided with multiple front and rear parallel air outlets. The dust suction device includes a dust suction fan and a dust suction pipe with a front wide and rear narrow gradually changing section. The dust suction fan is connected to the front end of the dust suction pipe, and the dust suction pipe is arranged on the top of the dust cover and sequentially connected to the multiple air outlets from rear to front.

6. The dust-proof structure of the air quenching system according to claim 5, characterized in that: The dust suction pipe is provided with a front wide and rear narrow gradually changing section, and the front air outlet is connected to the gradually changing section of the dust suction pipe.

7. The dust-proof structure of a wind-quenching system according to claim 1, wherein: The side wall of the dust cover includes a frame and a transverse steel plate mounted on the frame. Each of the upper and lower adjacent transverse steel plates is provided with a transverse gap, and a transverse baffle is arranged to block the transverse gap.

8. The dust-proof structure of the air quenching system according to claim 7, characterized in that: The transverse baffle is only welded to one of the transverse steel plates, and the other transverse steel plate is not welded.

9. The dust-proof structure of a wind- quenching system according to claim 1, wherein: The dust suction device includes a cloth bag dust collector, and the cloth bag dust collector is provided with a spark catcher connected to the air inlet end.

10. The dust-proof structure of the air quenching system according to claim 9, characterized in that: The dust cover is provided with a dust conveying device connected to the dust outlet of the cloth bag dust collector at the inlet end and connected to the dust cover at the outlet end, so as to send the dust collected by the cloth bag dust collector into the dust cover.

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