Device for collecting large-particle dust in sintering flue gas

Abstract

The invention discloses a sintering flue gas large-particle dust collecting device, and belongs to the technical field of dust collecting devices. According to the technical scheme, the dust collection device comprises a dust collection plate arranged in a sintering flue, the bottom of the sintering flue is communicated with a chute, the dust collection plate is located above the chute, a control valve is arranged on a discharge pipeline at the bottom of the chute, an embedded scraper is arranged at the bottom of the discharge pipeline, and a temperature measuring device and a cooling device are arranged on the embedded scraper. And the temperature measuring device and the cooling device are electrically connected with the controller. The method has the beneficial effects that the sintering production efficiency is improved; dust is timely discharged without large blocks, manual cleaning is not needed, and the labor cost is reduced.

Description

Technical Field

[0001] This invention relates to a device for collecting large particulate dust from sintering flue gas, belonging to the technical field of dust collection devices. Background Technology

[0002] In the sintering production process, flue gas purification is an indispensable and crucial step. Electrostatic precipitators (ESPs), as the core purification equipment, are mainly used to capture particulate matter in the sintering flue gas. Specifically, after the flue gas enters the ESP, large dust particles are captured under the action of the first electric field and then fall into the ash hopper below the equipment. This collected dust needs to be transferred to the sintering batching process via subsequent valves and conveying equipment to achieve dust recycling and reuse.

[0003] However, in actual operation, the above process presents significant technical challenges. Because the captured large dust particles contain a small amount of incompletely burned high-temperature fuel particles, these particles are prone to secondary combustion after falling into the ash hopper. The high temperatures generated by this secondary combustion cause the dust temporarily stored in the ash hopper to solidify, gradually forming large lumps. These lumps are hard and large, making them impossible to discharge smoothly through conventional valves. This leads to blockage of the electrostatic precipitator's ash removal system, preventing the equipment from operating normally and directly affecting the continuous operation of the sintering production line.

[0004] Currently, the industry generally uses manual cleaning to deal with large solidified particles inside the dust hopper. The specific cleaning process is as follows: when large particles form inside the dust hopper and cause equipment malfunction, the electrostatic precipitator must be stopped first. Then, workers enter the dust hopper and use specialized tools to break up the large particles. The broken dust is then discharged through the manhole or the lower valve of the dust hopper. If oversized particles cannot be broken, the side wall of the dust hopper must be cut to remove the large particles. The cut side wall must then be repaired to restore the dust hopper to its normal function.

[0005] The aforementioned manual cleaning methods have revealed many shortcomings in practical applications and are no longer sufficient to meet the high-efficiency and safe operation requirements of modern sintering production. Specific deficiencies are as follows: On the one hand, it severely reduces sintering production efficiency. Because the interior of the ash hopper is a confined space with inherent safety hazards such as high temperatures and dust, cleaning operations must be carried out while the machine is stopped to ensure the safety of cleaning personnel. As the electrostatic precipitator is a key component of the sintering production line, its shutdown directly leads to the interruption of the entire sintering production line, causing production stagnation and significantly reducing the continuity and overall efficiency of sintering production.

[0006] On the other hand, the cleaning operation is difficult and inefficient. The narrow and complex internal space of the ash hopper not only limits the number of cleaning personnel who can enter at one time, but also imposes many constraints on the operating range of cleaning tools, significantly reducing the flexibility of tool use. At the same time, the large, solidified blocks are extremely hard, and the crushing operation is time-consuming and labor-intensive, further exacerbating the difficulty of the cleaning work. In addition, for large blocks that cannot be crushed, the additional steps of sidewall cutting, large block removal, and sidewall repair further prolong the cleaning cycle, resulting in low cleaning efficiency.

[0007] Chinese utility model patent application number 2022218374343 discloses an electrostatic precipitator ash hopper with a dredging function. The patent technical solution describes an ash hopper body with an ash hopper receiving cavity. The ash hopper receiving cavity is provided with a dredging mechanism for dredging accumulated ash. When the ash in the ash hopper receiving cavity is hardened, the dredging mechanism needs to be operated by the staff outside the ash hopper to dredge the ash in the ash hopper receiving cavity. This requires stopping the machine for manual cleaning, which is inefficient and wastes labor costs. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the purpose of this invention is to provide a sintering flue gas large particulate dust collection device that improves sintering production efficiency and eliminates the need for manual cleaning.

[0009] The technical solution of the present invention is: a sintering flue gas large particulate dust collection device, including a dust collection plate disposed in the sintering flue, the bottom of the sintering flue being connected to a chute, the dust collection plate being located above the chute, a control valve being provided on the discharge pipe at the bottom of the chute, a scraper conveyor being provided at the bottom of the discharge pipe, and a temperature measuring device and a cooling device being provided on the scraper conveyor, both of which are electrically connected to a controller.

[0010] The dust collection plate comprises several parallel plates, and the surface of the dust collection plate is provided with ventilation holes. The ventilation holes on two adjacent dust collection plates are not collinear.

[0011] The control valve includes a manual valve and an ash discharge valve located below the manual valve.

[0012] The ash discharge valve is a double-layer ash discharge valve.

[0013] The ash discharge valve is equipped with a timer, which is electrically connected to a controller, and the controller is connected to control the ash discharge valve.

[0014] The surface of the dust collection plate is coated with a wear-resistant coating.

[0015] The angle between the inclined sidewall of the chute and the sintering flue is greater than 70°.

[0016] The temperature measuring device is an infrared high-temperature particle monitoring probe.

[0017] The cooling device includes a nozzle and a water supply pipe connected to the nozzle. The water supply pipe is equipped with a solenoid valve that is electrically connected to the controller.

[0018] The buried scraper conveyor is equipped with a sealed outer shell, and the chain and scraper of the buried scraper conveyor are made of heat-resistant stainless steel.

[0019] The beneficial effects of this invention include: 1) Improve sintering production efficiency: The device can effectively collect large particles and high-temperature fuel particles in the flue gas, greatly reducing the probability of large lumps forming in the electrostatic precipitator ash hopper, reducing the time that sintering is interrupted due to the removal of large lumps, and improving sintering production efficiency.

[0020] 2) Dust is discharged in a timely manner without large pieces, eliminating the need for manual cleaning and reducing labor costs: Large dust particles collected by the device are discharged in a timely manner through chutes and unloading equipment. No material is stored in the chutes, so large pieces will not form and no manual cleaning is required. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] The attached figures are labeled as follows: 1. Sintering flue; 2. Dust collection plate; 3. Chute; 4. Manual valve; 5. Ash discharge valve; 6. Submerged scraper conveyor; 7. Temperature measuring device; 8. Cooling device. Detailed Implementation

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include the three-dimensional spatial dimensions of length, width, and depth.

[0027] The following is in conjunction with the appendix Figure 1 Further explanation of the present invention: A sintering flue gas large particulate dust collection device includes a dust collection plate 2 installed inside a sintering flue 1. The sintering flue 1 is a circular steel structure with a wear-resistant coating on its inner wall to prevent the flue gas from eroding and abrading the inner wall. The dust collection plate 2 is a circular steel structure welded to the inner wall of the flue. The surface of the dust collection plate 2 is coated with a wear-resistant coating to prevent the flue gas from eroding and abrading the surface of the dust collection plate 2. The bottom of the sintering flue 1 is connected to a chute 3. The dust collection plate 2 is located above the chute 3. A control valve is installed on the discharge pipe at the bottom of the chute 3. A scraper conveyor 6 is installed at the bottom of the discharge pipe. The scraper conveyor 6 is equipped with a temperature measuring device 7 and a cooling device 8. The temperature measuring device 7 is an infrared high-temperature particle monitoring probe. The cooling device 8 includes a nozzle and a water supply pipe connected to the nozzle. A solenoid valve electrically connected to a controller is installed on the water supply pipe. Both the infrared high-temperature particle monitoring probe and the solenoid valve are electrically connected to the controller.

[0028] When sintering flue gas containing a certain amount of dust passes through the dust collection plate 2 in the sintering flue 1, large particles will collide with the dust collection plate 2 and fall into the chute 3 below. After passing through the manual valve 4 and the ash discharge valve 5, they enter the scraper conveyor 6 and are sent to the ring cooling belt. If the infrared high-temperature particle monitoring probe detects that the large particles contain high-temperature fuel particles, it will send a high-temperature signal to the controller. The controller sends an opening command to the solenoid valve, the solenoid valve opens, and the nozzle sprays water to cool down the high-temperature fuel particles, so as to prevent the high-temperature particles from damaging the subsequent ring cooling belt.

[0029] The dust collection plate 2 comprises several parallel plates. The surface of the dust collection plate 2 is provided with ventilation holes, which allow flue gas and small dust particles to pass through, but large dust particles cannot pass through. The ventilation holes on adjacent dust collection plates 2 are not collinear, that is, they are staggered to form a maze-like structure, which enhances the dust removal effect.

[0030] The control valves include a manual valve 4 and an ash discharge valve 5 located below the manual valve 4. The ash discharge valve 5 is a double-layer ash discharge valve, which can prevent ambient air from entering the sintering flue 1 through the equipment below during the unloading process. The ash discharge valve 5 is equipped with a timer, which is electrically connected to a controller. The controller controls the ash discharge valve 5 and can set the ash discharge time as needed to meet the ash discharge requirements of the chute 3.

[0031] The angle between the inclined sidewall of the chute 3 and the sintering flue 1 is greater than 70°. If dust falls onto its sidewall, it can slide down quickly without lingering, ensuring that no material accumulates.

[0032] The scraper conveyor 6 is equipped with a sealed outer shell to prevent dust from spilling out during operation. The chain and scraper of the scraper conveyor 6 are made of heat-resistant stainless steel, thereby extending their service life.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A device for collecting large particulate dust from sintering flue gas, characterized in that, It includes a dust collection plate (2) installed in the sintering flue (1), the bottom of the sintering flue (1) is connected to the chute (3), the dust collection plate (2) is located above the chute (3), a control valve is provided on the discharge pipe at the bottom of the chute (3), a scraper machine (6) is provided at the bottom of the discharge pipe, and a temperature measuring device (7) and a cooling device (8) are provided on the scraper machine (6), and the temperature measuring device (7) and the cooling device (8) are both electrically connected to the controller.

2. The sintering flue gas large particulate dust collection device according to claim 1, characterized in that, The dust collection plate (2) includes several parallel plates. The surface of the dust collection plate (2) is provided with ventilation holes. The ventilation holes on two adjacent dust collection plates (2) are not collinear.

3. The sintering flue gas large particulate dust collection device according to claim 1, characterized in that, The control valve includes a manual valve (4) and an ash discharge valve (5) located below the manual valve (4).

4. The sintering flue gas large particulate dust collection device according to claim 3, characterized in that, The ash discharge valve (5) is a double-layer ash discharge valve.

5. The sintering flue gas large particulate dust collection device according to claim 3, characterized in that, The ash discharge valve (5) is equipped with a timer, which is electrically connected to the controller, and the controller is connected to control the ash discharge valve (5).

6. The sintering flue gas large particulate dust collection device according to claim 1, characterized in that, The surface of the dust collection plate (2) is coated with a wear-resistant coating.

7. The sintering flue gas large particulate dust collection device according to claim 1, characterized in that, The angle between the inclined sidewall of the chute (3) and the sintering flue (1) is greater than 70°.

8. The sintering flue gas large particulate dust collection device according to claim 1, characterized in that, The temperature measuring device (7) is an infrared high-temperature particle monitoring probe.

9. The sintering flue gas large particulate dust collection device according to claim 1, characterized in that, The cooling device (8) includes a nozzle and a water supply pipe connected to the nozzle, and the water supply pipe is equipped with a solenoid valve electrically connected to the controller.

10. The sintering flue gas large particulate dust collection device according to claim 1, characterized in that, The buried scraper machine (6) is equipped with a sealed outer shell, and the chain and scraper of the buried scraper machine (6) are made of heat-resistant stainless steel.

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