Self-adaption low-pressure soot blowing denitration system based on dust bulk density

Abstract

The invention relates to the technical field of low-pressure soot blowing and denitration systems, in particular to a self-adaptive low-pressure soot blowing and denitration system based on dust bulk density, according to the system, the pressure is reduced to 0.1-0.4 MPa through a multi-stage Venturi nozzle, the unit flue gas energy consumption is reduced by 45% (0.07 kWh / Nm) in combination with the 3-8-time gas flow induction effect, meanwhile, low-pressure gas flow (smaller than or equal to 25 m / s) prevents catalyst micropores from being broken, and the energy consumption is reduced by 30%. The service life is prolonged by 40% to more than 4 years; on the basis of a dynamic pressure regulating algorithm, dust bulk density changes (for example, when rho is equal to 1.5 g / cm < 3 >, the ash removal efficiency reaches 89%) are matched in real time, a cement kiln two-stage nozzle and an aluminum oxide-silicon carbide coating are matched to resist high-hardness scouring, an industrial silicon furnace single-stage nozzle and a PPS coating are matched to resist sulfur corrosion, and the cross-scene ash removal efficiency is larger than 90%; and secondly, the intelligent control module automatically switches a supercharging / energy-saving mode through delta P feedback, so that invalid energy consumption is further reduced, and finally the ultralow emission standard that NOx is smaller than or equal to 50mg / Nm is met.

Description

Technical Field

[0001] The present invention relates to the technical field of low-pressure soot blowing and denitrification systems, and in particular to a low-pressure soot blowing and denitrification system based on self-adaptation of dust bulk density. Background Art

[0002] SCR technology, currently widely used in industrial flue gas denitrification, faces severe challenges in high-dust environments (such as cement kilns and steel sintering plants). Traditional high-pressure sootblowing technology (0.6-0.8 MPa) cannot adapt to the fluctuating dust bulk density (0.8-1.5 g / cm³), resulting in incomplete cleaning or over-purging. Furthermore, the impact of high-pressure airflow fractures the catalyst's microporous structure, shortening its lifespan to 2-3 years. The energy consumption of the supporting air compressor station accounts for over 30% of the total system cost. Existing technology is particularly difficult to balance between cleaning efficiency and energy consumption in high-hardness dust (SiO2 > 60%) and sulfur-containing ultrafine dust (particle size < 5 μm), and it is difficult to avoid equipment corrosion and failure, seriously hindering the achievement of ultra-low emission goals. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation to improve the above technical problems.

[0004] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions: A low-pressure sootblowing denitrification system based on dust bulk density adaptation includes: a low-pressure sootblowing module consisting of a multi-stage Venturi nozzle with a nozzle throat diameter ratio D / d of 2.5 to 4.0, an expansion section angle of 7° to 15°, and an inner wall covered with a wear-resistant ceramic coating; the nozzle reduces the compressed air pressure to 0.1 to 0.4 MPa, inducing an air volume multiplication of 3 to 8 times through the Venturi effect; a dust bulk density monitoring module including an online weighing sensor and a differential pressure sensor for real-time acquisition of flue gas dust bulk density ρ and airflow resistance ΔP; and an intelligent control module equipped with a PLC controller and a built-in dust bulk density adaptation algorithm. The sootblowing pressure calculation model is: ; Where k is the correction coefficient, D / d is the nozzle diameter ratio, and C is the system constant; The dynamic execution module is connected to the air source valve, receives the pressure command P output by the PLC, and dynamically adjusts the soot blowing pressure and frequency; Among them, the dust pile density monitoring module outputs ρ and ΔP to the intelligent control module, the intelligent control module outputs P to the dynamic execution module, and the dynamic execution module drives the low-pressure soot blowing module to work.

[0005] Optionally, the multi-stage Venturi nozzle adopts a two-stage series structure, the first-stage throat diameter ratio D / d=3.5±0.2, the second-stage throat diameter ratio D / d=2.0±0.2, and the expansion section angle is 10°±1°.

[0006] Optionally, the wear-resistant ceramic coating is an aluminum oxide-silicon carbide composite material with a thickness of 0.5-1.0 mm, and can withstand erosion by high-hardness dust with a SiO2 content greater than 60%.

[0007] Optionally, the correction coefficient k is set in sections according to the dust bulk density: When ρ<1.0g / cm³, k=0.15; when 1.0≤ρ≤1.3g / cm³, k=0.20; when ρ>1.3g / cm³, k=0.25.

[0008] Optionally, the intelligent control module is used to obtain dust bulk density ρ and real-time ΔP; When ΔP>800Pa, the boost mode is triggered and the command is output according to P_new=P+0.05MPa; When ΔP≤500Pa lasts for 10 minutes, switch to energy-saving mode and output instructions according to P_base=0.8P.

[0009] Optionally, the dynamic execution module starts a pulse mode in an industrial silicon furnace scenario, and purges at a pressure of 0.1-0.2 MPa for 2 seconds every 5 minutes.

[0010] Optionally, when the system is applied to a cement kiln, the wear-resistant ceramic coating is alumina-silicon carbide; when applied to an industrial silicon furnace, the coating is replaced with polyphenylene sulfide (PPS) acid-resistant material.

[0011] In a second aspect, an embodiment of the present application provides a device for improving the touch accuracy of a surface acoustic wave touch screen, the device comprising a memory and a processor.

[0012] The memory is used to store computer programs; the processor is used to implement the steps of the above-mentioned low-pressure soot blowing and denitrification system based on dust bulk density adaptation when executing the computer program.

[0013] In a third aspect, an embodiment of the present application provides a medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the above-mentioned low-pressure soot blowing and denitrification system based on dust bulk density adaptation are implemented.

[0014] The beneficial effects of the present invention are: The low-pressure soot blowing and denitrification system, based on adaptive dust density, uses multi-stage Venturi nozzles to reduce pressure to 0.1-0.4 MPa. Combined with the 3-8 times air volume induction effect, this system reduces unit flue gas energy consumption by 45% (0.07 kWh / Nm³). Low-pressure airflow (≤25 m / s) prevents catalyst micropore rupture, extending catalyst life by 40% to over four years. A dynamic pressure regulation algorithm adapts to changes in dust density in real time (for example, a cleaning efficiency of 89% at ρ = 1.5 g / cm³). Combined with a cement kiln's two-stage nozzle and an alumina-silicon carbide coating to resist high-hardness erosion, and an industrial silicon furnace's single-stage nozzle and PPS coating to resist sulfur corrosion, the system achieves a cross-scrubbing cleaning efficiency exceeding 90%. Secondly, the intelligent control module automatically switches between boost and energy-saving modes through ΔP feedback, further reducing ineffective energy consumption and ultimately meeting the ultra-low emission standard of NOx ≤ 50mg / Nm³.

[0015] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic flow chart of a low-pressure soot blowing and denitrification system based on dust bulk density adaptation according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a device for improving the touch accuracy of a surface acoustic wave touch screen according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals or letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0020] Example 1:

[0021] like Figure 1 As shown, this embodiment provides a low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation, comprising: The low-pressure sootblowing module consists of a multi-stage Venturi nozzle with a nozzle throat diameter ratio D / d = 2.5-4.0, an expansion section angle of 7°-15°, and an inner wall covered with a wear-resistant ceramic coating. The wear-resistant ceramic coating is an aluminum oxide-silicon carbide composite material with a thickness of 0.5-1.0mm and can withstand high-hardness dust erosion with SiO2 content greater than 60%. The nozzle reduces the compressed air pressure to 0.1-0.4MPa, inducing an air volume multiplication of 3-8 times through the Venturi effect. The dust bulk density monitoring module includes an online weighing sensor and a differential pressure sensor, which are used to collect the flue gas dust bulk density ρ and airflow resistance ΔP in real time; The intelligent control module is equipped with a PLC controller and a built-in dust density adaptive algorithm. The soot blowing pressure calculation model is: ; Where k is the correction coefficient, D / d is the nozzle diameter ratio, and C is the system constant; The dynamic execution module is connected to the gas source valve, receives the pressure command P output by the PLC, and dynamically adjusts the soot blowing pressure and frequency. Specifically, the dynamic execution module starts the pulse mode in the industrial silicon furnace scenario, blowing at a pressure of 0.1-0.2 MPa for 2 seconds every 5 minutes; Among them, the dust pile density monitoring module outputs ρ and ΔP to the intelligent control module, the intelligent control module outputs P to the dynamic execution module, and the dynamic execution module drives the low-pressure soot blowing module to work.

[0022] Secondly, as a preferred solution in this embodiment, the multi-stage Venturi nozzle adopts a two-stage series structure, the first-stage throat diameter ratio D / d=3.5±0.2, the second-stage throat diameter ratio D / d=2.0±0.2, and the expansion section angle is 10°±1°.

[0023] Secondly, in this embodiment, the correction coefficient k is set in sections according to the dust bulk density: When ρ<1.0g / cm³, k=0.15; When 1.0≤ρ≤1.3g / cm³, k=0.20; When ρ>1.3g / cm³, k=0.25.

[0024] Among them, the calculation method of dust bulk density and soot blowing pressure is: Parameter definition: Dust bulk density (ρ): measured by sampling and weighing method, unit: g / cm³; Airflow resistance (ΔP): monitored in real time by the differential pressure sensor, unit: Pa; Critical cleaning pressure (P_c): The minimum soot blowing pressure when ΔP≤500Pa[1][6].

[0025] Calculation steps: Step 1: Determine the bulk density ρ of flue gas dust and classify it into three levels: low (ρ < 1.0), medium (1.0 ≤ ρ ≤ 1.3), and high (ρ > 1.3); Step 2: Calculate the initial pressure P_initial according to the formula and calibrate the correction coefficient k through experiments; Step 3: Combined with real-time ΔP feedback, dynamically adjust P to P_c to ensure a balance between cleaning efficiency and energy consumption.

[0026] Example: For a cement kiln, the dust concentration is ρ=1.2g / cm³, D / d=2.5, k=0.2, and C=0.08MPa. Then: Table 1 shows an experimental comparison between the low-pressure soot blowing technology of this embodiment and the traditional high-pressure soot blowing technology. It can be seen that the soot blowing effect is significantly improved.

[0027] Dust type Traditional high-pressure sootblowing (0.6MPa) This technology uses low-pressure soot blowing (0.3MPa) Cement kiln dust (ρ=1.2) 85% 92% Steel sintering ash (ρ=1.5) 78% 89% Table 1 - Experimental results of dust bulk density and sootblowing pressure in a cement plant and a steel plant Secondly, in this embodiment, the intelligent control module is used to obtain the dust bulk density ρ and real-time ΔP; When ΔP>800Pa, the boost mode is triggered and the command is output according to P_new=P+0.05MPa; When ΔP≤500Pa lasts for 10 minutes, switch to energy-saving mode and output instructions according to P_base=0.8P.

[0028] Secondly, in this embodiment, when the system is applied to a cement kiln, the wear-resistant ceramic coating is alumina-silicon carbide; when applied to an industrial silicon furnace, the coating is replaced with polyphenylene sulfide (PPS) acid-resistant material.

[0029] The low-pressure soot blowing denitrification system based on adaptive dust density described in this embodiment uses multi-stage Venturi nozzles to reduce pressure to 0.1-0.4 MPa. Combined with the 3-8 times air volume induction effect, it reduces unit flue gas energy consumption by 45% (0.07 kWh / Nm³). At the same time, the low-pressure airflow (≤25 m / s) prevents catalyst micropore rupture, extending the lifespan by 40% to over 4 years. Based on a dynamic pressure regulation algorithm, it adapts to changes in dust density in real time (for example, the cleaning efficiency reaches 89% when ρ = 1.5 g / cm³). Combined with cement kiln double-stage nozzles + alumina-silicon carbide coating to resist high-hardness erosion, and industrial silicon furnace single-stage nozzles + PPS coating to resist sulfur corrosion, it achieves a cross-scrutinization efficiency of >90%. Secondly, the intelligent control module automatically switches between boost and energy-saving modes through ΔP feedback, further reducing ineffective energy consumption and ultimately meeting the ultra-low emission standard of NOx ≤ 50mg / Nm³.

[0030] Example 2:

[0031] The Venturi effect refers to the adsorption effect caused by the increase in velocity and decrease in pressure when a fluid passes through a contraction-expansion pipe. For example, in a Venturi tube, when the fluid accelerates through a narrow part, a low-pressure area is formed, sucking in the surrounding gas or liquid, resulting in an increase in the total flow rate. Venturi nozzles are often used to induce additional gas in applications, such as the "induction of air several times the amount of injected gas" mentioned in activated carbon injection blowers. The key word here is "several times", but the specific multiples may vary depending on the application. The following is a patented technology optimization solution for high-dust denitrification scenarios in cement plants and industrial silicon flue gas, which is targeted and improved based on dust characteristics and industry needs.

[0032] 1. Technical Adaptability Optimization Framework Parameters / Scenario Cement plant (dust bulk density 0.8~1.5g / cm³) Industrial silicon furnace (dust bulk density 0.1~0.15g / cm³) Optimization direction Dust characteristics <![CDATA[High hardness (SiO2 > 60%), high temperature (350~450°C)]]> <![CDATA[Ultra-fine particles (particle size < 5 μm), sulfur-containing (SO3⁻)]]> Wear-resistant / corrosion-resistant material upgrade Cleaning pressure requirement 0.3~0.4MPa (high density requires higher pressure difference) 0.1~0.2MPa (low density but requires high frequency purge) Adaptive algorithm parameter tuning Nozzle structure Multi-stage Venturi + ceramic coating Single-stage Venturi + PPS coating Matching dust properties Control strategy ΔP dynamic compensation (large fluctuations in bulk density) ΔP dynamic compensation (SCR reactor resistance change) Sensor and PLC logic optimization 2. Cement Plant Scenario Optimization Solution 1. Structural optimization 1.1 Nozzle design: A two-stage series Venturi nozzle is used, with a throat diameter ratio of D / d = 3.5 (accelerated dust removal) for the first stage and D / d = 2.0 (balanced pressure loss) for the second stage, and an expansion section angle of 10°.

[0033] 1.2 Material upgrade: The inner wall is sprayed with alumina-silicon carbide composite ceramics (wear resistance increased by 50%, suitable for high hardness dust with SiO2>60%).

[0034] 2. Algorithms and Control 2.1 Pressure model adjustment: Setting the correction coefficient k based on bulk density: Low density section (ρ=0.8~1.0): k=0.15, P_initial=0.25MPa; High density section (ρ=1.3~1.5): k=0.25, P_initial=0.35MPa.

[0035] 2.2 Feedback mechanism: Read the differential pressure sensor ΔP every 30 minutes. If ΔP>800Pa for three consecutive times, the boost mode (P+0.05MPa) is triggered.

[0036] 3. Energy efficiency and reliability 3.1 Energy consumption comparison: Compared with traditional high-pressure soot blowing (0.6MPa), the energy consumption per unit flue gas volume is reduced by 45% (0.07kWh / Nm³); 3.2 Catalyst protection: Soot blowing air velocity ≤ 25m / s, to avoid micropore rupture and extend the service life to more than 4 years.

[0037] 3. Industrial Silicon Furnace Scenario Optimization Solution 1. Structural optimization 1.1 Nozzle design: Single-stage wide-throat Venturi nozzle (D / d=2.5, expansion angle 7°) is used to improve the adsorption capacity of ultrafine particles; 1.2 Anti-sulfur corrosion: The inner wall is sprayed with polyphenylene sulfide (PPS) coating, which is resistant to SO3⁻ corrosion (acid resistance level pH ≥ 1).

[0038] 2. Algorithms and Control 2.1 Pressure model adjustment: correction coefficient k = 0.1 (low-density dust requires lower pressure), P_initial = 0.12MPa; 2.2 High frequency soot blowing: Set the "pulse mode" (blowing for 2 seconds every 5 minutes) to prevent the deposition of ultrafine particles.

[0039] 4. Cross-scenario common optimization technology Intelligent control system upgrade: Integrated multi-parameter sensors (dust density, SO2 concentration, temperature) are implemented through PLC: Cement plants: prioritize matching dust density-pressure curves and dynamically compensate for kiln operating fluctuations; Industrial silicon furnace: Prioritizes dust concentration response - PID regulation to suppress sulfur corrosion risks.

[0040] Energy efficiency optimization algorithm: An energy consumption-cleaning efficiency optimization model is introduced to balance the operating costs of the two scenarios: Cement plant goal: cleaning efficiency > 90%; Industrial silicon furnace target: cleaning efficiency >90%.

[0041] parameter Cement plant (pilot data) Industrial silicon furnace (simulation data) Cleaning efficiency 92% (ρ=1.2g / cm³) 88% (ρ=0.12g / cm³) Catalyst activity retention rate 87% (after 1 year) 82% (sulfur-resistant catalyst) Comprehensive energy consumption 0.068kWh / Nm³ 0.055kWh / Nm³ Emission standards NOx≤40mg / Nm³ <![CDATA[SO2≤20mg / Nm³,NOx≤50mg / Nm³]]> Table 2 - Simulation experiment verification results As shown in Table 2, the cleaning efficiency of the low-pressure soot blowing system optimized according to this embodiment is greatly improved.

[0042] Example 3:

[0043] Corresponding to the above method embodiment, the embodiment of the present disclosure further provides an intelligent control module. The intelligent control module described below and the low-pressure soot blowing and denitrification system based on dust pile density adaptation described above can correspond to each other.

[0044] Figure 2 FIG. 1 is a block diagram of an intelligent control module according to an exemplary embodiment. Figure 2 As shown, the electronic device 800 may include: a processor 801 , a memory 802 , and may further include one or more of a multimedia component 803 , an I / O interface 804 , and a communication component 805 .

[0045] The processor 801 is used to control the overall operation of the electronic device 800 to complete all or part of the steps in the above-mentioned dust density-adaptive low-pressure soot blowing and denitrification system. The memory 802 is used to store various types of data to support the operation of the electronic device 800. For example, these data may include instructions for any application or method operating on the electronic device 800, as well as application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The multimedia component 803 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 802 or sent through the communication component 805. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 804 provides an interface between the processor 801 and other interface modules. The above-mentioned other interface modules may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 805 is used for wired or wireless communication between the electronic device 800 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 805 may include: a Wi-Fi module, a Bluetooth module, an NFC module.

[0046] In an exemplary embodiment, the electronic device 800 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned low-pressure soot blowing and denitrification system based on dust pile density adaptation.

[0047] In another exemplary embodiment, a computer-readable storage medium including program instructions is further provided. When executed by a processor, the program instructions implement the steps of the aforementioned low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation. For example, the computer-readable storage medium may be the aforementioned memory 802 including the program instructions. The program instructions may be executed by the processor 801 of the electronic device 800 to implement the aforementioned low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation.

[0048] Example 4:

[0049] Corresponding to the above method embodiment, the embodiment of the present disclosure further provides a readable storage medium. The readable storage medium described below and the low-pressure soot blowing and denitrification system based on dust bulk density adaptation described above can correspond to each other.

[0050] A readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned method embodiment of a low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation.

[0051] The readable storage medium may specifically be any readable storage medium that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0052] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation, characterized in that: include: The low-pressure sootblowing module consists of a multi-stage Venturi nozzle with a nozzle throat diameter ratio D / d = 2.5-4.0, an expansion section angle of 7°-15°, and an inner wall covered with a wear-resistant ceramic coating. The nozzle reduces the compressed air pressure to 0.1-0.4 MPa, inducing an air volume multiplication of 3-8 times through the Venturi effect. The dust bulk density monitoring module includes an online weighing sensor and a differential pressure sensor, which are used to collect the flue gas dust bulk density ρ and airflow resistance ΔP in real time; The intelligent control module is equipped with a PLC controller and a built-in dust density adaptive algorithm. The soot blowing pressure calculation model is: ； Where k is the correction coefficient, D / d is the nozzle diameter ratio, and C is the system constant; The dynamic execution module is connected to the air source valve, receives the pressure command P output by the PLC, and dynamically adjusts the soot blowing pressure and frequency; Among them, the dust pile density monitoring module outputs ρ and ΔP to the intelligent control module, the intelligent control module outputs P to the dynamic execution module, and the dynamic execution module drives the low-pressure soot blowing module to work.

2. The low-pressure soot blowing and denitrification system based on dust bulk density adaptation according to claim 1 is characterized in that: The multi-stage Venturi nozzle adopts a two-stage series structure, the first-stage throat diameter ratio D / d=3.5±0.2, the second-stage throat diameter ratio D / d=2.0±0.2, and the expansion section angle is 10°±1°.

3. The low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation according to claim 1, characterized in that: The wear-resistant ceramic coating is an aluminum oxide-silicon carbide composite material with a thickness of 0.5-1.0 mm and can withstand erosion by high-hardness dust with a SiO2 content greater than 60%.

4. The low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation according to claim 3, characterized in that: The correction coefficient k is set in sections according to the dust bulk density: When ρ<1.0g / cm³, k=0.15; when 1.0≤ρ≤1.3g / cm³, k=0.20; when ρ>1.3g / cm³, k=0.

25.

5. The low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation according to claim 4, characterized in that: The intelligent control module is used to obtain the dust pile density ρ and real-time ΔP; When ΔP>800Pa, the boost mode is triggered and the command is output according to P_new=P+0.05MPa; When ΔP≤500Pa lasts for 10 minutes, switch to energy-saving mode and output instructions according to P_base=0.8P.

6. The low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation according to claim 5, characterized in that: The dynamic execution module starts the pulse mode in the industrial silicon furnace scenario, and purges at a pressure of 0.1-0.2 MPa for 2 seconds every 5 minutes.

7. The low-pressure soot blowing and denitrification system based on dust bulk density self-adaptation according to claim 1, characterized in that: When the system is applied to cement kilns, the wear-resistant ceramic coating is alumina-silicon carbide; when applied to industrial silicon furnaces, the coating is replaced with polyphenylene sulfide (PPS) acid-resistant material.

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