High-purity quartz sand roasting tail gas electrostatic dust removal device

Abstract

The application relates to the technical field of electrostatic dust removal, and discloses a high-purity quartz sand roasting tail gas electrostatic dust removal device which comprises a dust removal box body, an air inlet channel, an air outlet channel, a dust collecting component and a discharging component. The dust collecting component comprises circulating dust collecting belts, and a discharging support is arranged between the two dust collecting belts and is provided with multiple groups of discharging needles. Cooling rollers and self-adaptive tensioning mechanisms are arranged on the circulating paths of the dust collecting belts, a thermal response adjusting mechanism synchronously adjusts the cooling water flow and the pre-tightening state of elastic members according to the air inlet temperature, and the local expansion degree of the air inlet channel is changed. The device can continuously update the dust collecting surface and realize continuous dust removal without shutdown, simultaneously considers the dust collecting belt cooling, tensioning compensation and air inlet state adjustment under high-temperature working conditions, and is favorable for improving the continuity and operation stability of the electrostatic capturing process.

Description

Technical Field

[0001] This invention relates to the field of electrostatic dust removal technology, and in particular to an electrostatic dust removal device for high-purity quartz sand roasting tail gas. Background Technology

[0002] During the roasting process of high-purity quartz sand, some impurities in the raw materials need to be removed or transformed through high temperature. The exhaust gas generated during roasting is usually characterized by high temperature and fine dust. In order to reduce dust emissions with the exhaust gas, dust removal equipment is usually required during the production process. Electrostatic dust removal uses discharge electrodes to form an electric field, which charges the dust particles in the exhaust gas and causes them to migrate and deposit towards the dust collection electrode. It has the characteristics of relatively low airflow resistance and is suitable for continuous treatment of dust-containing gases. Therefore, it can be used for dust treatment of exhaust gas from high-purity quartz sand roasting.

[0003] In existing electrostatic precipitators, when continuously processing high-purity quartz sand roasting exhaust gas, dust continuously accumulates on the dust collection surface. As operating time increases, the dust accumulation on the surface changes continuously, while the dust content in the exhaust gas gradually decreases along the flow direction. When using a relatively fixed discharge and dust collection structure, it is difficult to maintain a good match between the discharge conditions in each area and the actual dust load and dust collection surface condition. This can easily lead to insufficient utilization of discharge capacity in some areas and excessively high dust collection loads in others, thus affecting the stability of electrostatic collection during continuous operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing electrostatic dust removal device, when continuously processing the tail gas of high-purity quartz sand roasting, has a fixed discharge and dust collection mode that is difficult to adapt to the changes in the dust load and dust accumulation state of the tail gas along the process and the dust collection surface, which affects the stability of electrostatic collection during continuous operation. Therefore, we propose an electrostatic dust removal device for the tail gas of high-purity quartz sand roasting.

[0005] To achieve the above objectives, this application adopts the following technical solution: an electrostatic dust removal device for high-purity quartz sand roasting tail gas, comprising a dust removal box, an air inlet channel and an exhaust channel provided on the dust removal box, and an electrostatic dust removal mechanism provided inside the dust removal box.

[0006] The electrostatic dust removal mechanism includes a dust collection component and a discharge component disposed between the dust collection components. The dust collection component includes two dust collection belts that are arranged opposite each other and can circulate. The discharge component includes a discharge bracket disposed between the two dust collection belts and multiple sets of discharge needles disposed on both sides of the discharge bracket.

[0007] The dust collection belt is equipped with a cooling roller and an adaptive tensioning mechanism for maintaining the tension of the dust collection belt. Cooling water can circulate inside the cooling roller. The adaptive tensioning mechanism includes a tensioning roller for applying tension to the dust collection belt, an elastic element for providing preload to the tensioning roller, and an adjustment frame for adjusting the preload state of the elastic element.

[0008] The cooling roller is connected to a cooling pipe, and the cooling pipe is equipped with a flow regulating component driven by an adjusting frame. The dust collector is equipped with a thermal response regulating mechanism, which is used to drive the adjusting frame to rise and fall according to the airflow temperature in the air intake channel, so as to adjust the cooling water flow and the pre-tightening state of the elastic component.

[0009] Preferably, a pair of drive rollers are rotatably arranged on both sides of the lower end of the dust collector chamber, and a pair of cooling rollers are rotatably arranged on both sides of the upper end of the chamber. The drive roller and the two cooling rollers on the same side jointly support the corresponding dust collection belt, so that the dust collection belt forms a right-angled triangular circulation path. The side closer to the middle of the dust collector chamber forms a dust collection area, the top forms a cooling area, and the side away from the middle of the dust collector chamber forms a cleaning area.

[0010] Preferably, a dust removal component is provided in the cleaning area. The dust removal component is installed in the dust removal box and corresponds to the surface of the dust collection belt. When the dust collection belt moves from the dust collection area to the cleaning area, it passes around the transmission roller and bends and changes direction, causing the dust layer attached to the surface of the dust collection belt to loosen as the curvature of the belt changes. The dust removal component is used to remove the dust on the surface of the dust collection belt as it continues to move.

[0011] Preferably, multiple sets of discharge needles on both sides of the discharge bracket are spaced apart along the height direction of the discharge bracket, and the arrangement density of the discharge needles gradually decreases from the end closer to the air intake channel to the end closer to the exhaust channel.

[0012] Preferably, the dust collection belt is a conductive metal belt and is conductively connected to the grounding terminal.

[0013] Preferably, the cooling roller has a hollow structure, and cooling pipes are respectively set at both ends of the cooling roller and connected to the inner cavity of the cooling roller. Water inlets are provided on the cooling pipes. Water enters through the corresponding water inlet at one end of the cooling roller and water exits through the corresponding water inlet at the other end, so that the cooling water circulates through the cooling roller.

[0014] Preferably, the adaptive tensioning mechanism further includes a floating seat that is vertically slidably disposed on the inner wall of the dust collector box. The floating seats are arranged in pairs along the axial direction of the tensioning roller. The tensioning roller is rotatably disposed between the two corresponding floating seats and located at the top of the dust collection belt. An adjusting frame is disposed above the floating seats. An elastic element is disposed between the adjusting frame and the floating seats so that the tensioning roller maintains an elastic tensioning effect on the dust collection belt through the floating seats.

[0015] Preferably, the flow regulating component is disposed on the regulating frame and extends into the cooling pipe. The end of the flow regulating component corresponds to the water inlet. When the regulating frame descends, it drives the flow regulating component to reduce the blocking area of ​​the water inlet, thereby increasing the flow rate of cooling water entering the cooling roller. When the regulating frame rises, it drives the flow regulating component to increase the blocking area of ​​the water inlet, thereby reducing the flow rate of cooling water.

[0016] Preferably, the thermal response adjustment mechanism includes a mounting groove disposed on the side wall of the air intake channel, a thermal response element disposed in the mounting groove, and a drive rod that is laterally movable on the dust collector housing. One end of the drive rod is connected to the thermal response element, and the other end is provided with a height adjustment element. The adjustment frame is provided with an inclined adjustment groove that cooperates with the movement guide of the height adjustment element.

[0017] Preferably, the thermally responsive element is a bimetallic sheet or bimetallic plate that can bend and deform with temperature changes. The thermally responsive element at least partially constitutes the side guide boundary of the intake channel and is configured to bend away from the axis of the intake channel as the intake temperature increases.

[0018] Preferably, the end of the cooling roller extends into the cooling pipe and is rotatably connected to the cooling pipe so that the cooling roller can rotate relative to the cooling pipe and maintain the communication of cooling water between the two.

[0019] The technical effects and advantages of this invention are as follows:

[0020] This invention utilizes circulating dust collection belts on both sides of the discharge component to continuously form a renewable dust collection surface in the dust collection area, and continuously transports the attached dust to the cleaning area for removal, reducing the impact of continuous dust layer thickening on the electrostatic collection process. Simultaneously, the discharge needles are arranged with a gradually decreasing density from top to bottom along the exhaust gas flow direction, adapting the higher discharge capacity at the top to the higher dust load at the inlet, while appropriately reducing the discharge density at the bottom to match the changes in dust content after gradual dust collection of the exhaust gas and the dust accumulation state along the dust collection belt, thereby improving the matching relationship between discharge and dust collection at different heights. During the circulation process, the dust collection belt can also be cooled by cooling rollers, maintaining a relatively low temperature on the belt surface as it re-enters the dust collection area. This helps reduce the continuous thermal impact of high-temperature exhaust gas on the dust collection belt and its tension, and utilizes the temperature difference between the exhaust gas and the dust collection belt to assist the migration of fine particles to the dust collection surface.

[0021] This invention further utilizes a thermally responsive element to generate a mechanical response to changes in inlet air temperature, and converts this response into the raising and lowering of the regulating frame. This allows the same temperature change to simultaneously affect the cooling water flow rate and the tension compensation of the dust collection belt. When the temperature rises, the cooling water flow rate is increased, and the pre-tension of the elastic element is improved to compensate for the tension changes that may occur after the dust collection belt stretches due to heat. This helps maintain the straightness of the dust collection area and the stability of its relative position with the discharge component. At the same time, the bending of the thermally responsive element itself can also change the local expansion degree of the inlet air channel, buffering and regulating the changes in exhaust gas volume flow rate under high temperature conditions. Thus, cooling, tension compensation, and inlet air state adjustment form an interrelated mechanical response around the change in exhaust gas temperature. There is no need to configure separate detection and execution mechanisms, resulting in a compact structure and improving the stability of continuous electrostatic dust removal under different calcination conditions. Attached Figure Description

[0022] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 A structural diagram from another perspective based on the original structure;

[0025] Figure 3 This is a schematic diagram of the internal structure of the dust collector housing of the present invention;

[0026] Figure 4 This is a front view of the internal structure of the dust collector box of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the air intake channel and dust collection belt as a whole in the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the thermal response component and the cooling roller in the present invention in the form of a mating state;

[0029] Figure 7 This is a structural schematic diagram of the drive rod and adjustment frame of the present invention in a disassembled state;

[0030] Figure 8 This is a schematic cross-sectional view of the connection between the cooling pipe and the flow regulating component of the present invention.

[0031] Figure 9 This is a schematic diagram of the structure of the discharge bracket of the present invention.

[0032] Legend: 1. Dust collector housing; 2. Air inlet channel; 3. Exhaust channel; 4. Cooling pipe; 5. Dust collection belt; 6. Discharge bracket; 7. Dust collector component; 8. Drive roller; 9. Cooling roller; 10. Tensioning roller; 11. Thermal response component; 12. Mounting groove; 13. Water inlet; 14. Adjusting frame; 15. Flow regulating component; 16. Drive rod; 17. Floating seat; 18. Elastic component; 19. Adjusting groove; 20. Height adjusting component; 21. Discharge needle. Detailed Implementation

[0033] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0034] Reference Figures 1-9 As shown, the present invention provides a technical solution: an electrostatic dust removal device for high-purity quartz sand roasting tail gas. The tail gas generated during the roasting process of high-purity quartz sand usually has the characteristics of high temperature, carrying fine quartz dust, and the temperature changing with the roasting conditions. The temperature change of the tail gas will also change its volume state and flow state when it enters the dust removal area.

[0035] The device includes a hollow dust collection chamber 1, with an air inlet channel 2 at the top and an exhaust channel 3 at the bottom. An electrostatic dust removal mechanism is installed inside, which includes a discharge component and a dust collection component. The discharge component is located between the dust collection components and corresponds to the air inlet channel 2 and the exhaust channel 3. During operation, the roasting exhaust gas enters the dust collection chamber 1 from top to bottom through the air inlet channel 2. The discharge component forms a corona electric field between the dust collection components to charge the dust particles. The charged dust particles migrate to the dust collection components on both sides under the action of the electric field and are captured. The gas after dust removal continues to flow downward and is discharged through the exhaust channel 3.

[0036] In a preferred embodiment of the present invention, the dust collection component includes drive rollers 8 rotatably disposed on both sides of the lower end of the inner cavity of the dust collector 1. A pair of cooling rollers 9 are rotatably disposed on both sides of the upper end of the inner cavity of the dust collector 1. The two cooling rollers 9 on the same side are arranged in parallel, and the cooling roller 9 closest to the central axis of the dust collector 1 corresponds to the drive roller 8. A dust collection belt 5 is jointly disposed on the outside of the drive roller 8 and the cooling roller 9 on the same side. The dust collection belt 5 is preferably made of a heat-resistant and conductive metal belt capable of continuously winding around the rollers, such as a thin-walled stainless steel belt, to balance conductivity. Temperature resistance and bending performance required when passing over each roller; the dust collection belt 5 is supported by the drive roller 8 and two cooling rollers 9 to form a right-angled triangle, with the top of the dust collection belt 5 being the short right-angled side, the side of the dust collection belt 5 closer to the middle of the dust collector 1 being the long right-angled side, and the side farther from the middle of the dust collector 1 being the hypotenuse; wherein, the long right-angled side is the dust collection area, the short right-angled side is the cooling area, and the hypotenuse is the cleaning area; during operation, the dust collection belt 5 corresponding to the dust collection area moves from top to bottom, and as the dust collection belt 5 moves downward, the dust captured on its surface gradually increases, while the dust concentration in the exhaust gas... After being captured along the process, the dust gradually decreases, thus forming a continuous dust collection path adapted to the airflow treatment process. When the dust deposit layer formed in the dust collection area enters the cleaning area after being reversed by the drive roller 8, it changes from a nearly straight state to a curved state along with the dust collection belt 5. The relative deformation between the dust deposit layer and the dust collection belt 5 due to the change in curvature makes the dust layer prone to cracking, local lifting, or loosening of the adhesion interface, thereby forming a pre-loosening effect before formal cleaning. A dust removal component 7 can be installed in the cleaning area. The dust removal component 7 is preferably a scraper installed inside the dust collection box 1. Similar structures are used, with one end corresponding to the surface of the dust collection belt 5. When the dust collection belt 5 moves, it will be relatively displaced with the dust removal component 7, thereby scraping off the dust that has passed through the cleaning area. The dust collection area moves downward, and the cleaning area moves upward. The cleaning area is arranged at an angle, and the dust that has detached from the dust collection belt 5 has a downward tendency under the action of gravity, which is opposite to the upward direction of the cleaning area. This can reduce the possibility of the detached dust re-attaching to the surface of the dust collection belt 5. Furthermore, the dust collection belt 5 moves continuously, and surface dust can be cleaned without stopping the machine, which improves efficiency.

[0037] In a preferred embodiment of the present invention, the discharge component includes a discharge bracket 6 disposed between two dust collection zones. Multiple sets of discharge needles 21 facing adjacent dust collection zones are arranged in layers along the height direction on both sides of the discharge bracket 6. The density of the discharge needles 21 per unit height gradually decreases from top to bottom. Specifically, this can be achieved by having a smaller spacing between the upper needle rows and gradually increasing the spacing downwards, or by appropriately reducing the number of discharge needles 21 in the lower needle rows while maintaining the needle row spacing. Since the dust concentration is relatively high when the exhaust gas enters from the top, and gradually decreases as it flows downwards along the dust collection zone, the higher discharge point density at the top can provide sufficient charging for the high-concentration dust-laden exhaust gas. Simultaneously, the dust collection belt 5 runs from top to bottom, and the amount of dust deposited on its surface typically increases gradually. Appropriately reducing the discharge point density at the bottom can maintain the residual fine particle capture capacity while reducing the possibility of excessively high local current loads and abnormal discharges in areas corresponding to thicker dust layers, thus matching the discharge capacity along the height direction with the changes in the dust content of the exhaust gas and the dust accumulation state of the dust collection belt 5.

[0038] To form a complete electrostatic dust removal electric field, the dust collection belt 5 adopts a conductive structure and remains grounded. Specifically, reliable grounding can be achieved through the conductive shaft system of the transmission roller 8 and cooling roller 9 or through independently set grounding conductive components. The discharge bracket 6 is conductively connected to the discharge needle 21 and connected to the high-voltage output terminal of the external high-voltage power supply. The discharge bracket 6 is electrically isolated from the dust collection box 1 and other grounded components through an insulating installation structure. The main surface of the discharge bracket 6 preferably adopts a relatively smooth conductive structure to reduce corona concentration at unexpected locations. The tip of the discharge needle 21 has a small radius of curvature, so that the electric field is mainly concentrated near the tip of the discharge needle 21. This establishes a stable corona electric field between the discharge needle 21 and the dust collection belt 5, which is grounded on both sides, causing the dust particles passing through this area to become charged and migrate to the surface of the dust collection belt 5.

[0039] To enable the operation of the dust collection belt 5, a drive device can be installed on the dust collection box 1. The drive device preferably uses a geared motor to drive at least one transmission roller 8 to rotate. Alternatively, existing transmission methods such as synchronous belts and chain drives can be used to make the transmission roller 8 and the cooling roller 9 run synchronously, so that the dust collection belts 5 corresponding to the two dust collection areas maintain a low-speed continuous movement from top to bottom. The drive device and synchronous transmission structure can both adopt existing mature technologies, and this invention will not elaborate further.

[0040] In order to cool the dust collection belt 5 in the cooling zone, a cooling pipe 4 corresponding to the end of the cooling roller 9 is fixedly installed on the dust collector box 1. The end of the cooling roller 9 extends to the inside of the cooling pipe 4 and is rotatably connected to the cooling pipe 4 through a sealed bearing. The cooling roller 9 has a hollow structure, and cooling water can flow inside. The cooling roller 9 is connected to the cooling pipe 4. The cooling pipe 4 is located at both ends of the cooling roller 9. The cooling pipe 4 is provided with a water inlet 13 connected to the cooling pipe 4. The water inlet 13 on one end of the cooling pipe 4 is used for water inlet, and the water inlet 13 on the other end of the cooling pipe 4 is used for water outlet. The cooling water can be circulated through an external cooling water circulation system. The details are not elaborated in detail. After the dust collection belt 5 completes surface dust removal in the cleaning zone, it returns upwards and passes through the top cooling zone before re-entering the dust collection zone. Therefore, the cooling roller 9 can preferentially cool the relatively clean belt surface at the upper end of the dust collection zone before it enters the dust collection zone. This can reduce the continuous heat accumulation of the high-temperature exhaust gas on the dust collection belt 5 and create a significant temperature difference between the dust collection belt 5 entering the upper end of the dust collection zone and the high-temperature exhaust gas. For fine particles in the exhaust gas, this temperature gradient can generate a thermophoretic tendency to migrate from the higher temperature gas region to the lower temperature dust collection belt 5 surface. This, combined with the particle migration direction driven by the electrostatic field, forms an auxiliary and enhanced effect on the collection of fine dust in the upper high dust-containing region.

[0041] Because the incoming airflow is hot, the dust collection belt 5 will experience temperature rise and thermal expansion after continuous contact with the high-temperature exhaust gas. Without compensation, this can easily lead to belt slack, decreased straightness of the working section, and fluctuations in the effective distance between the belt and the discharge needle 21. To ensure the tension of the dust collection belt 5, an adaptive tensioning mechanism is provided in the dust collector housing 1. This mechanism includes floating seats 17 vertically sliding on the inner wall of the dust collector housing 1. The floating seats 17 are arranged in pairs, one in front of the other, and correspond to the top cooling area of ​​the dust collection belt 5. A tensioning roller 10 is rotatably mounted between the two corresponding floating seats 17, located at the top of the dust collection belt 5. The tensioning roller 10 exerts a downward pressure on the top of the dust collection belt 5. An adjusting frame 14 is also provided inside the dust collector housing 1, located above the tensioning roller 10. An elastic element 18 is provided between the 14 and the floating seat 17. The elastic element 18 can be a component such as a compression spring that can provide continuous elastic pressure. The elastic element 18 can generate continuous downward pressure on the tensioning roller 10 on the dust collection belt 5, thereby making the dust collection belt 5 taut. When the dust collection belt 5 changes length due to thermal elongation, the floating seat 17 and the tensioning roller 10 can generate corresponding floating displacement under the action of the elastic element 18 to absorb the belt length change and maintain the basic tension state. At the same time, the tensioning roller 10 presses down on the dust collection belt 5 located between the two cooling rollers 9, which can make the dust collection belt 5 form a larger coverage angle and contact arc length on the outer periphery of the cooling roller 9, thereby increasing the effective heat exchange contact range between the dust collection belt 5 and the cooling roller 9, so that the tensioning action and the top cooling action form a structural match.

[0042] A flow regulating component is provided on the cooling pipe 4. The flow regulating component includes a flow regulating element 15 mounted on the regulating frame 14. The flow regulating element 15 is a vertical rod-shaped structure, with its lower end extending to the inside of the cooling pipe 4 and corresponding to the water inlet 13. The flow regulating element 15 and the cooling pipe 4 are in a movable sealing fit. When the flow regulating element 15 moves down, it can reduce the obstruction area at the end of the water inlet 13, thereby increasing the flow rate at the water inlet 13. When the flow regulating element 15 moves up, it can increase the obstruction area at the end of the water inlet 13, thereby reducing the flow rate at the water inlet 13, thus adaptively regulating the cooling water flow rate. By setting the shape of the lower end of the flow regulating element 15 and its relative position to the water inlet 13, the flow rate change can continuously correspond to the lifting and lowering displacement of the regulating frame 14, while retaining the basic flow area required to meet the cooling water circulation.

[0043] To achieve the lifting and lowering of the aforementioned regulating frame 14, the present invention also includes a thermal response regulating mechanism. This mechanism drives the regulating frame 14 to lift and lower based on changes in the exhaust gas temperature in the intake channel 2. When the temperature is high, the regulating frame 14 lowers appropriately, on the one hand driving the flow regulating component 15 to lower, thereby increasing the effective flow area of ​​the water inlet 13 and increasing the cooling water flow rate in the cooling roller 9; on the other hand, it further compresses the elastic component 18, increasing the pre-tightening effect of the elastic component 18 on the floating seat 17, to compensate for the thermal elongation of the dust collection belt 5 and the tension force changes caused by the floating of the tension roller 10 under high temperature conditions. The elastic component 18 provides basic adaptive tension under normal conditions, while the temperature-related lifting and lowering of the regulating frame 14 provides additional tension pre-tightening compensation; the two functions complement each other. The thermal response regulating mechanism includes a mounting groove 12 disposed on the side wall of the intake channel 2, in which a thermal response component 11 is disposed. The thermal response component 11 preferably adopts a bimetallic sheet or bimetallic plate structure, which is formed by composite metal layers with different coefficients of linear expansion. When the temperature changes, the elongation of each metal layer is different, thus achieving thermal response. The thermal response element 11 undergoes a directional bending deformation; the stacking direction of each metal layer can be set according to the required bending direction, so that when the exhaust gas temperature rises, the thermal response element 11 bends away from the axis of the intake channel 2; a drive rod 16 corresponding to the thermal response element 11 is laterally movably arranged in the dust collector 1, one end of the drive rod 16 is connected to the thermal response element 11, and the other end is movably connected to the adjustment frame 14. The adjustment frame 14 is provided with an inclined adjustment groove 19, and the end of the drive rod 16 near the adjustment frame 14 is provided with a groove that moves with the adjustment groove 19. The height adjustment component 20 is a guide and is preferably a roller rotatably mounted on the drive rod 16. When the exhaust gas temperature in the intake channel 2 increases, the bending amount of the thermal response component 11 increases and drives the drive rod 16 to move laterally. The height adjustment component 20 moves along the adjustment groove 19, and the lateral displacement of the drive rod 16 is converted into the downward displacement of the adjustment frame 14 by the inclined trajectory of the adjustment groove 19. When the exhaust gas temperature decreases, the bending amount of the thermal response component 11 decreases or returns to its original position, and the drive rod 16 moves in the opposite direction, thereby causing the adjustment frame 14 to rise.

[0044] It should be noted that, in addition to outputting mechanical displacement, the thermal response element 11 also constitutes a locally variable guide boundary of the intake channel 2. When the exhaust gas temperature rises, the thermal response element 11 bends away from the axis of the intake channel 2 and forms an arc-shaped profile, so that the intake channel 2 forms a local expansion section in the area near the thermal response element 11 that first expands and then contracts along the airflow direction. Under similar mass flow rate conditions, when the exhaust gas temperature rises, the gas density decreases and the volumetric flow rate tends to increase. The local gradual expansion can moderately decelerate and buffer the high-temperature exhaust gas before entering the electrostatic dust removal area, reduce the flow velocity fluctuation caused by the local high-speed airflow directly entering the dust collection area, and help improve the airflow uniformity between the two dust collection belts 5. The downstream of the expansion adopts a gradual transition, so that the airflow gradually recovers to the cross-section adapted to the predetermined dust removal channel before entering the dust collection area, avoiding obvious flow separation caused by sudden expansion and contraction. When the exhaust gas temperature decreases, the thermal response element 11 returns to the initial position, and the degree of local expansion decreases accordingly, so as to avoid unnecessary excessive deceleration under low volumetric flow rate conditions.

[0045] Therefore, in this embodiment, the exhaust gas temperature in the intake channel 2 is used as a common operating condition input, and multiple interrelated compensations are completed simultaneously by the bending deformation of the thermal response element 11. When the exhaust gas temperature rises, on the one hand, the high-temperature exhaust gas increases the thermal load on the dust collection belt 5 and causes the dust collection belt 5 to thermally elongate; on the other hand, the change in the exhaust gas volume state easily causes the local flow velocity entering the dust removal area to increase. Corresponding to the above changes, the thermal response element 11 bends outward to form a locally expanding intake boundary. At the same time, the adjustment frame 14 is driven to descend through the drive rod 16, the height adjustment element 20, and the adjustment groove 19. The cooling water flow rate is increased synchronously by the same adjustment frame 14, and the additional preload of the elastic element 18 is increased. The amount of heat is used to specifically compensate for the temperature rise, thermal expansion, and flow state of the high-temperature exhaust gas in the dust collection belt 5. When the exhaust gas temperature decreases, the actions reverse and recover, the cooling water flow rate and additional pre-tightening amount decrease accordingly, and the local expansion degree of the air intake channel 2 also decreases synchronously, which can reduce excessive cooling and excessive tension under low temperature conditions. This structure concentrates the temperature-sensing deformation of the thermal response component 11, the change of the air intake boundary, and the mechanical output of the adjustment frame 14 into the same action chain. There is no need to set up independent active actuators for the above functions. The structure is compact and makes each adjustment effect form a complete mechanical response relationship around the common influence of the high-temperature exhaust gas on the electrostatic dust removal process.

[0046] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. An electrostatic dust removal device for high-purity quartz sand roasting tail gas, characterized in that, It includes a dust collector housing, which is equipped with an air inlet channel and an exhaust channel, and an electrostatic dust removal mechanism is installed inside the dust collector housing; The electrostatic dust removal mechanism includes a dust collection component and a discharge component disposed between the dust collection component. The dust collection component includes two dust collection belts that are arranged opposite each other and can circulate. The discharge component includes a discharge bracket disposed between the two dust collection belts and multiple sets of discharge needles disposed on both sides of the discharge bracket. The dust collection belt is equipped with a cooling roller and an adaptive tensioning mechanism for maintaining the tension of the dust collection belt. Cooling water can circulate inside the cooling roller. The adaptive tensioning mechanism includes a tensioning roller for applying tension to the dust collection belt, an elastic element for providing pre-tension to the tensioning roller, and an adjustment frame for adjusting the pre-tension state of the elastic element. The cooling roller is connected to a cooling pipe, and the cooling pipe is equipped with a flow regulating component driven by an adjusting frame. The dust collector is equipped with a thermal response regulating mechanism, which is used to drive the adjusting frame to rise and fall according to the airflow temperature in the air intake channel, so as to adjust the cooling water flow and the pre-tightening state of the elastic component.

2. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 1, characterized in that: The lower end of the dust collector box is equipped with drive rollers on both sides, and the upper end of the dust collector box is equipped with a pair of cooling rollers on both sides. The drive roller and the two cooling rollers on the same side jointly support the corresponding dust collection belt, so that the dust collection belt forms a right-angled triangular circulation path. The side closer to the middle of the dust collector box forms a dust collection area, the top forms a cooling area, and the side away from the middle of the dust collector box forms a cleaning area.

3. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 2, characterized in that: The cleaning area is equipped with a dust removal component, which is installed inside the dust removal box and corresponds to the surface of the dust collection belt. When the dust collection belt moves from the dust collection area to the cleaning area, it passes around the transmission roller and bends and changes direction, causing the dust layer attached to the surface of the dust collection belt to loosen as the curvature of the belt changes. The dust removal component is used to remove the dust from the surface of the dust collection belt as it continues to move.

4. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 1, characterized in that: Multiple sets of discharge needles on both sides of the discharge bracket are spaced apart along the height direction of the discharge bracket, and the arrangement density of the discharge needles gradually decreases from the end closer to the air intake channel to the end closer to the exhaust channel.

5. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 1, characterized in that: The dust collection belt is a conductive metal belt that is conductively connected to the grounding terminal.

6. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 2, characterized in that: The cooling roller has a hollow structure, with cooling pipes respectively located at both ends of the cooling roller and connected to the inner cavity of the cooling roller. The cooling pipes are provided with water inlets. Water enters through the corresponding water inlet at one end of the cooling roller and exits through the corresponding water inlet at the other end, so that the cooling water circulates through the cooling roller.

7. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 1, characterized in that: The adaptive tensioning mechanism also includes a floating seat that is vertically slidably disposed on the inner wall of the dust collector box. The floating seats are arranged in pairs along the axial direction of the tensioning roller. The tensioning roller is rotatably disposed between the two corresponding floating seats and located at the top of the dust collection belt. An adjusting frame is disposed above the floating seats. An elastic element is disposed between the adjusting frame and the floating seats so that the tensioning roller maintains an elastic tensioning effect on the dust collection belt through the floating seats.

8. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 7, characterized in that: The flow regulating component is mounted on the regulating frame and extends into the cooling pipe. The end of the flow regulating component corresponds to the water inlet. When the regulating frame descends, it causes the flow regulating component to reduce the obstruction area of ​​the water inlet, thereby increasing the flow rate of cooling water entering the cooling roller. When the regulating frame rises, it causes the flow regulating component to increase the obstruction area of ​​the water inlet, thereby reducing the flow rate of cooling water.

9. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 8, characterized in that: The thermal response adjustment mechanism includes a mounting groove on the side wall of the air intake channel, a thermal response component in the mounting groove, and a drive rod that is laterally movable on the dust collector. One end of the drive rod is connected to the thermal response component, and the other end is provided with a height adjustment component. The adjustment frame is provided with an inclined adjustment groove that cooperates with the movement guide of the height adjustment component.

10. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 9, characterized in that: The thermally responsive element is a bimetallic sheet or bimetallic plate that can bend and deform with temperature changes. The thermally responsive element at least partially constitutes the side guide boundary of the intake channel and is configured to bend away from the axis of the intake channel as the intake temperature increases.

11. The electrostatic dust removal device for high-purity quartz sand roasting tail gas according to claim 6, characterized in that: The end of the cooling roller extends into the cooling pipe and is rotatably connected to the cooling pipe so that the cooling roller can rotate relative to the cooling pipe and maintain the cooling water communication between the two.

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