A device for preventing silicon powder blockage of RTO heat accumulator based on high-pressure pulse back flushing

Abstract

The utility model relates to a kind of RTO heat accumulator anti-silicon powder blocking device based on high-pressure pulse back flushing, it includes: RTO furnace body, inside is provided with heat storage cavity and oxidation cavity, the heat storage cavity is filled with heat accumulator, the oxidation cavity is located the top of the heat storage cavity;Ash removal system, including: clean gas pipe, setting in the top of the heat accumulator, multiple nozzles are equipped on the clean gas pipe, each the nozzle corresponds one or a group of honeycomb hole channel;Pulse valve, install on the clean gas pipe.By setting ash removal system, compressed air is controlled by pulse valve, high kinetic energy, large flow, strong penetration jet flow can be generated by nozzle, can effectively peel off the silicon powder adhered in the deep place of heat accumulator hole channel, reduce the silicon powder in hole channel inner wall blockage.

Description

Technical Field

[0001] This utility model relates to the field of regenerative thermal oxidation equipment, specifically to a device for preventing silicon powder blockage in an RTO regenerator based on high-pressure pulse backflushing. Background Technology

[0002] RTO (Regenerative Thermal Oxidizer) is a highly efficient device for treating volatile organic compounds (VOCs). However, when treating waste gas containing silicon powder (such as from photovoltaic, semiconductor, and silicone production), fine silicon powder (typically <10μm in diameter) easily enters the honeycomb channels of the heat storage medium with the airflow. Silicon powder has high hardness, high melting point, and strong adsorption properties, making it prone to deposition and sintering on the inner walls of the channels, causing blockage. This leads to a sharp increase in system pressure drop, a decrease in thermal efficiency, a drastic reduction in processing capacity, and even forced shutdown for cleaning, severely impacting the stability and lifespan of the equipment. Utility Model Content

[0003] Based on the above description, this utility model provides a device for preventing silicon powder blockage in RTO heat storage body based on high-pressure pulse backflushing, so as to solve the problem in related technologies that silicon powder is very easy to deposit and sinter on the inner wall of the channel, causing channel blockage.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A device for preventing silicon powder blockage in an RTO heat storage body based on high-pressure pulse backflushing, comprising: an RTO furnace body, which has a heat storage chamber and an oxidation chamber inside, wherein the heat storage chamber is filled with a heat storage body and the oxidation chamber is located above the heat storage chamber; a dust removal system, comprising: a clean air pipe, which is located above the heat storage body, wherein the clean air pipe is provided with multiple nozzles, each nozzle corresponding to one or a group of honeycomb channels; and a pulse valve, which is installed on the clean air pipe.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Furthermore, the oxidation chamber is connected to the hot end of the heat exchanger via a hot-end pipe, and the cold end of the heat exchanger is connected to the clean gas pipe via a cold-end pipe.

[0007] Furthermore, a first temperature sensor is installed on the hot end pipe, and a second temperature sensor is installed on the cold end pipe. The signals of the first temperature sensor and the second temperature sensor are connected to the processor.

[0008] Furthermore, a high-temperature regulating valve is installed on the hot-end pipe, and the high-temperature regulating valve is signal-connected to the processor.

[0009] Furthermore, the bottom of the heat storage chamber is connected to an air inlet pipe and an air outlet pipe, and one side is connected to a backflush pipe. A flow sensor is installed on the air inlet pipe.

[0010] Furthermore, an ash hopper is connected below the heat storage chamber, and a discharge device is provided between the ash hopper and the heat storage chamber.

[0011] Furthermore, the nozzle adopts a two-stage venturi structure, and the nozzle outlet is provided with swirl guide vanes.

[0012] Furthermore, the pulse valve is connected to the gas distribution manifold, and the gas distribution manifold is connected to the heat exchanger.

[0013] Furthermore, the heat storage chamber is equipped with a differential pressure sensor.

[0014] Furthermore, a third temperature sensor is installed at both the upper and lower ends of the heat storage body.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0016] By setting up a dust removal system, compressed air is controlled by a pulse valve and generates a high-energy, high-flow, and highly penetrating jet through the nozzle, which can effectively peel off the silicon powder adhering deep into the heat storage medium's pores and reduce the blockage of silicon powder on the inner wall of the pores. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the RTO system configuration structure provided in an embodiment of the present utility model;

[0018] Figure 2 A cross-sectional view of the RTO furnace body provided in an embodiment of this utility model;

[0019] Figure 3 A side view of the RTO furnace body provided for an embodiment of this utility model.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. RTO furnace body; 2. Burner; 3. Regenerator chamber; 4. Oxidation chamber; 5. Ash hopper; 6. Unloader; 7. Heat exchanger; 11. High-temperature regulating valve; 12. Hot end pipe; 14. Third temperature sensor; 15. First temperature sensor; 16. Second temperature sensor; 17. Differential pressure sensor; 30. Flow sensor; 43. Air inlet pipe; 45. Backflush pipe; 50. Air outlet pipe; 89. Inlet valve; 90. Outlet valve; 91. Regenerator; 95. Cold end pipe; 100. Clean air pipe; 101. Nozzle; 102. Gas distribution manifold; 103. Pulse valve. Detailed Implementation

[0022] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0023] This utility model provides a device for preventing silicon powder blockage in RTO heat storage bodies based on high-pressure pulse backflushing, which can solve the problem in related technologies where silicon powder is easily deposited and sintered on the inner wall of the channel, causing channel blockage.

[0024] See Figure 1 As shown in the figure, an RTO heat storage body anti-silicon powder blockage device based on high-pressure pulse backflushing is provided in an embodiment of this utility model. It mainly includes RTO furnace body 1, ash removal system and waste heat cascade utilization system, forming a synergistic ash removal technology system.

[0025] RTO furnace body 1 includes at least three heat storage chambers 3 spaced apart along its length and oxidation chambers 4 connected at the upper ends of the three heat storage chambers 3. Two layers of heat storage bodies 91 are installed in the heat storage chambers 3, and a ash removal system is installed on the upper part of both layers of heat storage bodies 91.

[0026] Furthermore, the dust removal system includes a clean air pipe 100, a cold end pipe 95, a pulse valve 103, etc. The clean air pipes 100 are arranged in parallel on the upper part of the pre-assembled heat storage body 91. Each clean air pipe 100 has several nozzles 101, and each nozzle 101 corresponds to one or a group of honeycomb channels.

[0027] Furthermore, the waste heat cascade utilization system includes a high-temperature regulating valve 11, a heat exchanger 7 and its connecting pipes. The oxidation chamber 4 is connected to the hot end pipe 12. The hot end pipe 12 is equipped with a high-temperature regulating valve 11 and is connected to the hot end of the heat exchanger 7. The cold end of the heat exchanger 7 is connected to the cold end pipe 95. After the compressed air is heated by the heat exchanger 7, it enters the air distribution manifold 102.

[0028] Preferably, the nozzle 101 adopts a two-stage Venturi structure. The first stage accelerates the airflow, and the second stage induces a heat storage chamber purification gas several times the volume of the blowing gas, forming a high-energy, high-flow-rate, and highly penetrating pulse jet that reaches deep into the orifice. The nozzle 101 outlet is designed with swirling guide vanes to generate controllable vortices in the jet, enhancing the shear force on the orifice wall.

[0029] Furthermore, each of the heat storage chambers 3 is connected to a hopper 5 at its lower part, and a discharger 6 is provided between the two. The discharger 6 is controlled by the control system to start intermittently, dropping the cleaned silicon powder into the hopper 5.

[0030] Furthermore, each of the clean air pipes 100 is connected to the cold end pipe 95, and the compressed air is controlled by the pulse valve 103. The operation of the entire high-pressure pulse backflushing system is uniformly controlled by the control system.

[0031] Furthermore, each of the pulse valves 103 is connected to the gas distribution manifold 102, and each heat storage chamber is equipped with two gas distribution manifolds 102.

[0032] In some embodiments, the multimodal intelligent control unit system is equipped with a multi-parameter sensor network, including: a differential pressure sensor 17, multiple temperature sensors, and a flow sensor 30.

[0033] Furthermore, the lower part of the heat storage chamber 3 is connected to three branch pipes, including an air inlet pipe 43, an air outlet pipe 50, and a backflush pipe 45, with valve bodies installed on the three branch pipes respectively.

[0034] Furthermore, a differential pressure sensor 17 is disposed in the heat storage chamber 3 to detect the resistance of each heat storage body.

[0035] Furthermore, the first temperature sensor 15 and the second temperature sensor 16 are located on the hot end pipe 12 and the cold end pipe 95 of the heat exchanger to detect the gas temperature and are linked with the high temperature regulating valve 11 for stepless temperature adjustment.

[0036] Furthermore, a third temperature sensor 14 is located at the upper end and lower end of the heat storage body 91 to determine the uneven heat transfer caused by partial blockage of the heat storage body 91.

[0037] Furthermore, a flow sensor 30 is installed on the air inlet duct 43 to monitor the actual flow rate of the processed air passing through the heat storage chamber 3.

[0038] In some embodiments, the core controller PLC has a built-in multimodal intelligent dust removal algorithm, which includes:

[0039] Basic mode: Dust cleaning is triggered based on fixed time intervals.

[0040] Differential pressure priority mode: When the real-time value of the pressure resistance ΔP of the heat storage body 91 exceeds the set threshold ΔP_set, the cleaning of the heat storage chamber 3 is immediately triggered, and the pulse pressure and frequency of the cleaning are automatically increased.

[0041] Temperature gradient mode: Calculates key temperature gradients in real time. When the gradient value exceeds the set range (indicating local blockage leading to uneven heat transfer), directional cleaning of the corresponding area is initiated (by controlling the valves of the corresponding nozzle group), even if ΔP does not exceed the limit.

[0042] Parameter self-adaptation: Based on historical dust removal effect data (such as the ΔP decrease rate after dust removal and the temperature gradient recovery), dynamically fine-tune the ΔP_set threshold and parameters such as pulse pressure, frequency, and vibration intensity corresponding to different degrees of blockage.

[0043] Furthermore, the core controller also includes a blockage prediction and health management module, which uses machine learning algorithms to predict the blockage trend and remaining service life of the heat storage body based on historical ΔP, temperature, and air flow data, and outputs early warning information or adjusts the ash removal strategy parameters.

[0044] In summary, the RTO heat storage body anti-silicone powder blockage device based on high-pressure pulse backflushing provided by this utility model embodiment has the following advantages:

[0045] Deep cleaning: High-frequency, high-voltage pulse combined with a dual-stage Venturi jet and vortex design generates a high-energy, high-flow, strong-penetration jet with vortexes, which can effectively peel off silicon powder adhering deep into the pores of the heat storage body.

[0046] Synergistic effect: The synergy between high-voltage pulse and RTO exhaust is a groundbreaking innovation. The efficient "purging" effect of RTO exhaust and pulsed airflow significantly outperforms the single method in removing highly adhesive silica powder.

[0047] Intelligent and Precise: Based on multi-modal fusion analysis of "differential pressure-time-temperature", the intelligent control system enables on-demand triggering (fast response), precise positioning (targeting blocked areas), and intensity self-adaptation (adjusting parameters according to the degree of blockage), avoiding ineffective cleaning and energy waste. Differential pressure priority and temperature gradient modes ensure timely and powerful intervention when blockages begin to appear or occur locally.

[0048] Preventive maintenance: The blockage prediction and health management module (optional) enables a shift from passive dust removal to proactive prevention, improving equipment reliability and lifespan.

[0049] The system is reliable: its modular design allows each unit to work independently yet collaboratively, making maintenance convenient.

[0050] 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 application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0051] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0052] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0053] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for preventing silicon powder blockage in an RTO heat storage body based on high-pressure pulse backflushing, characterized in that, It includes: The RTO furnace body (1) has a heat storage chamber (3) and an oxidation chamber (4) inside. The heat storage chamber (3) is filled with a heat storage body (91), and the oxidation chamber (4) is located above the heat storage chamber (3). The dust removal system includes: - A clean air pipe (100) is disposed above the heat storage body (91). The clean air pipe (100) is provided with a plurality of nozzles (101), each of the nozzles (101) corresponding to one or a group of honeycomb channels; - Pulse valve (103) is installed on the clean air pipe (100).

2. The device for preventing silicon powder blockage in RTO regenerators based on high-pressure pulse backflushing according to claim 1, characterized in that: The oxidation chamber (4) is connected to the hot end of the heat exchanger (7) via a hot end pipe (12), and the cold end of the heat exchanger (7) is connected to the clean air pipe (100) via a cold end pipe (95).

3. The device for preventing silicon powder blockage in RTO regenerators based on high-pressure pulse backflushing according to claim 2, characterized in that: The hot end pipe (12) is equipped with a first temperature sensor (15), and the cold end pipe (95) is equipped with a second temperature sensor (16). The first temperature sensor (15) and the second temperature sensor (16) are connected to the processor.

4. The RTO heat storage body anti-silicon powder blockage device based on high-pressure pulse backflushing according to claim 3, characterized in that: A high-temperature regulating valve (11) is installed on the hot end pipe (12), and the high-temperature regulating valve (11) is signal-connected to the processor.

5. The device for preventing silicon powder blockage in RTO regenerators based on high-pressure pulse backflushing according to claim 1, characterized in that: The bottom of the heat storage chamber (3) is connected to an air inlet pipe (43) and an air outlet pipe (50), and a backflush pipe (45) is connected to one side. A flow sensor (30) is installed on the air inlet pipe (43).

6. The device for preventing silicon powder blockage in RTO regenerators based on high-pressure pulse backflushing according to claim 1, characterized in that: A hopper (5) is connected to the bottom of the heat storage chamber (3), and a discharger (6) is provided between the hopper (5) and the heat storage chamber (3).

7. The device for preventing silicon powder blockage in RTO regenerators based on high-pressure pulse backflushing according to claim 1, characterized in that: The nozzle (101) adopts a two-stage venturi structure, and the outlet of the nozzle (101) is provided with a swirl guide vane.

8. The device for preventing silicon powder blockage in RTO heat storage body based on high-pressure pulse backflushing according to claim 1, characterized in that: The pulse valve (103) is connected to the gas distributor (102), and the gas distributor (102) is connected to the heat exchanger (7).

9. The device for preventing silicon powder blockage in RTO heat storage body based on high-pressure pulse backflushing according to claim 1, characterized in that: The heat storage chamber (3) is equipped with a differential pressure sensor (17).

10. The device for preventing silicon powder blockage in an RTO heat storage body based on high-pressure pulse backflushing according to claim 1, characterized in that: The heat storage body (91) is equipped with a third temperature sensor (14) at both the upper and lower ends.

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