Adsorption enhanced removal system for organic pollutants in condensable particles in coal-fired power plant

Abstract

The invention belongs to the technical field of pollutant removal, and discloses an efficient organic pollutant removal system which comprises a denitration unit, an adsorbent spraying device, a low-low-temperature electric dust collector, a wet flue gas desulfurization absorption tower and a high-pressure wet type electrostatic dust collector which are connected in sequence, the adsorbent spraying device is arranged in a flue in front of an inlet of the low-low-temperature electric dust remover and used for spraying powdered activated carbon to flue gas in the flue, and the powdered activated carbon comprises coconut shell-based activated carbon or wooden activated carbon; the flue gas analyzing and monitoring unit comprises sampling probes, and the sampling probes are mounted at an outlet of the denitration unit and on the side wall of the flue at a preset distance of the upstream of an injection point of the adsorbent injection device and are used for collecting and analyzing flue gas state parameters in real time; the adsorbent spraying device and the sampling probe are electrically connected with the spraying control unit. The device can stably operate under the conditions of high dust, medium-high temperature and high-sulfur flue gas, and can efficiently remove organic pollutants in the CPM.

Description

Technical Field

[0001] This invention belongs to the field of pollutant removal technology, and in particular relates to an adsorption-enhanced removal system for organic pollutants in condensable particulate matter in coal-fired power plants. Background Technology

[0002] After implementing ultra-low emission (ULE) technology retrofits, coal-fired power plants have effectively controlled emissions of conventional pollutants such as SO2, NOx, and filterable particulate matter. However, condensable particulate matter (CPM), due to its gaseous state in the flue and its tendency to condense into particles after discharge, has become a significant source of PM2.5. CPM contains a large amount of semi-volatile organic compounds (SVOCs), such as n-alkanes and phthalates (PAEs), which pose potential hazards to the environment and human health. Existing ultra-low emission systems typically include SCR, LLT-ESP, WFGD, and WESP units, which, while highly effective in removing conventional pollutants, are significantly inadequate in controlling organic pollutants in CPM.

[0003] SCR unit: Under high-temperature catalytic conditions, organic precursors may be oxidized to generate pollutants such as PAEs, resulting in a "negative removal" phenomenon.

[0004] WFGD system: Although it has a certain removal effect on some PAEs, the concentration of high carbon number n-alkanes will increase due to low temperature condensation.

[0005] WESP unit: Due to the increased inlet temperature and the significant reduction in pollutant concentration, its removal effect on SVOCs is limited.

[0006] Overall system: Insufficient ability to synergistically control organic pollutants in CPM, lacking targeted enhanced treatment methods.

[0007] Sludge co-firing: Although it can realize the resource utilization of sludge, it will introduce additional organic pollutants and exacerbate CPM emissions.

[0008] Therefore, in order to solve the problems of existing technologies, it is urgent to develop a system that can efficiently remove organic pollutants from CPM, especially a technical solution that can still operate stably under high dust, medium and high temperature, and high sulfur flue gas conditions. Summary of the Invention

[0009] The purpose of this invention is to provide an adsorption-enhanced removal system for organic pollutants in condensable particulate matter in coal-fired power plants, in order to solve the problems existing in the prior art.

[0010] To achieve the above objectives, this invention provides an adsorption-enhanced removal system for organic pollutants in condensable particulate matter in coal-fired power plants, comprising a denitrification unit, an adsorbent injection device, a low-temperature electrostatic precipitator, a wet flue gas desulfurization absorption tower, a high-pressure wet electrostatic precipitator, an injection control unit, and a flue gas analysis and monitoring unit. The denitrification unit is connected at one end to the boiler and at the other end sequentially to the adsorbent injection device, the low-temperature electrostatic precipitator, the wet flue gas desulfurization absorption tower, and the high-pressure wet electrostatic precipitator. The adsorbent injection device is installed in the flue before the inlet of the low-temperature electrostatic precipitator and is used to inject powdered activated carbon into the flue gas. The powdered activated carbon includes coconut shell-based activated carbon or wood-based activated carbon. The flue gas analysis and monitoring unit includes a sampling probe installed at the outlet of the denitrification unit and on the flue sidewall at a predetermined distance upstream of the injection point of the adsorbent injection device. The sampling probe is used to collect and analyze flue gas state parameters in real time. Both the adsorbent injection device and the sampling probe are electrically connected to the injection control unit.

[0011] Optionally, it also includes an MGGH cooling unit, which is installed before the inlet of the low-temperature electrostatic precipitator to cool the flue gas to a preset temperature.

[0012] Optionally, the preset temperature is 95-105°C.

[0013] Optionally, it also includes an adsorbent storage and supply unit, which is connected to the adsorbent injection device and is used to store powdered activated carbon.

[0014] Optionally, the adsorbent storage and supply unit is equipped with a metering device.

[0015] The technical effects of this invention are as follows:

[0016] This invention provides an adsorption-enhanced removal system for organic pollutants in condensable particulate matter (CPM) in coal-fired power plants. The adsorbent adsorbs n-alkanes and PAEs in flue gas under high temperature and high dust conditions, and then gas-solid separation is achieved through a low-temperature electrostatic precipitator. The adsorbent and fly ash are captured together, thereby achieving the purpose of efficient removal of organic pollutants. This invention can operate stably and efficiently remove organic pollutants from CPM under high dust, medium-high temperature, and high-sulfur flue gas conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the system flow in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the microstructure of the wood-based activated carbon in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the microstructure of coconut shell-based activated carbon in an embodiment of the present invention;

[0022] Figure 4 This is a comparison chart of the removal efficiencies of n-alkanes and PAEs under different adsorbent spraying conditions in the embodiments of the present invention;

[0023] Figure 5 This is a schematic diagram of sampling points in an embodiment of the present invention. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] To facilitate understanding of the present invention, a more comprehensive description of the invention will be given below with reference to the accompanying drawings, and several embodiments of the invention will be provided. However, the invention 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 the invention will be more thorough and complete.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0027] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] 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 invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figures 1-4 As shown, this embodiment provides an adsorption-enhanced removal system for organic pollutants in condensable particulate matter in a coal-fired power plant, including a denitrification unit, an adsorbent injection device, a low-temperature electrostatic precipitator, a wet flue gas desulfurization absorption tower, a high-pressure wet electrostatic precipitator, an injection control unit, and a flue gas analysis and monitoring unit. One end of the denitrification unit is connected to the boiler, and the other end is sequentially connected to the adsorbent injection device, the low-temperature electrostatic precipitator, the wet flue gas desulfurization absorption tower, and the high-pressure wet electrostatic precipitator. The adsorbent injection device is installed in the flue before the inlet of the low-temperature electrostatic precipitator and is used to inject powdered activated carbon into the flue gas. The powdered activated carbon includes coconut shell-based activated carbon or wood-based activated carbon. The flue gas analysis and monitoring unit includes a sampling probe, which is installed at the outlet of the denitrification unit and on the side wall of the flue at a predetermined distance upstream of the injection point of the adsorbent injection device. It is used to collect and analyze flue gas state parameters in real time. Both the adsorbent injection device and the sampling probe are electrically connected to the injection control unit.

[0032] In existing ultra-low emission coal-fired power plants, conventional air pollution control equipment (APCDs) effectively control semi-volatile organic compounds (SVOCs) contained in condensable particulate matter (CPM), especially n-alkanes (C... 16 -C 34The removal efficiency of phthalates (PAEs) is limited, and there are even technical challenges such as "negative removal." This embodiment addresses these issues by providing an adsorbent directional injection system and method based on multi-parameter synergistic optimization. It systematically reveals and utilizes the optimal coupling relationship between "temperature, adsorbent characteristics, and pollutant morphology," and constructs the entire system accordingly. This system includes a sequentially connected SCR, adsorbent injection device, LLT-ESP (low-temperature electrostatic precipitator), WFGD (wet flue gas desulfurization absorption tower), and WESP (high-pressure wet electrostatic precipitator). The adsorbent injection point is located approximately 5 meters before the LLT-ESP, and the injector uses pneumatic conveying. The adsorbent storage silo is equipped with a metering device. Flue gas sampling points are located at the inlet and outlet of each APCD to monitor changes in pollutant concentration.

[0033] LLT-ESP system: In conjunction with MGGH cooling system, it reduces flue gas temperature to 95-105°C, promotes SVOCs condensation and enhances their binding with adsorbent;

[0034] Adsorbent injection device: installed in the flue before the LLT-ESP inlet, used to inject powdered activated carbon (PAC) into the flue gas.

[0035] Powdered activated carbon type: Coconut shell-based activated carbon (ACY) or wood-based activated carbon (ACM) are preferred, with ACY being superior due to its high specific surface area (≥1200m2 / g) and rich mesoporous structure;

[0036] In addition to ACM and ACY, novel adsorbent materials such as modified activated carbon, biochar, and metal-organic frameworks (MOFs) can be explored. Furthermore, secondary injection points can be added before WFGD or WESP to achieve multi-stage adsorption.

[0037] Injection control system: The adsorbent injection rate can be adjusted in real time according to the concentration of organic matter in the flue gas. The recommended injection rate is 50–150 mg / Nm³. 3 ;

[0038] Back-end APCD unit: including WFGD and WESP, used for further purification of flue gas;

[0039] Monitoring and Feedback System: Sampling points are set up at key nodes to monitor the concentration changes of n-alkanes and PAEs in real time, optimize the injection strategy, and the sampling points are set up as follows: Figure 5 As shown, all types of testing equipment use the same sampling orifice.

[0040] The working principle of the above system is as follows: Adsorbent is sprayed to adsorb n-alkanes and PAEs in flue gas under high temperature and high dust conditions. Subsequently, a low-temperature electrostatic precipitator achieves gas-solid separation, capturing the adsorbent and fly ash together, thereby achieving efficient removal of organic pollutants. Furthermore, the system provided in this embodiment can be combined with advanced oxidation technologies such as ozone injection and low-temperature plasma to enhance the removal efficiency of recalcitrant organic compounds.

[0041] Regarding the optimal coupling relationship between temperature, adsorbent properties, and pollutant speciation, the specific details are as follows:

[0042] Discovery and Utilization of the Optimal Temperature Window (95-105°C): Before a low-temperature electrostatic precipitator (LLT-ESP), the flue gas temperature after cooling by an MGGH is typically between 95-105°C. This invention experimentally determines that 95-105°C is the "golden window" for the adsorbent to remove organic matter from CPM. Within this window, for n-Alkanes, higher molecular weight homologues (C... 25 The pollutants (as described above) have fully condensed from the gaseous state to the surface of submicron-sized liquid / solid particles or formed nucleations on their own, but their volatility is not yet low enough to prevent desorption from the adsorbent surface. At this point, the adsorbent's physical adsorption is strongest. For PAEs, these polar SVOCs are also in the critical phase transition region of gas-particle distribution. Their molecular kinetic energy is moderate, making them neither too difficult to capture due to excessively high temperatures nor too difficult to condense on the equipment wall due to excessively low temperatures, thus preventing effective contact with the adsorbent. If the temperature is above 105°C, too many pollutants remain in gaseous form, resulting in insufficient contact time with the adsorbent, and the excessively vigorous molecular thermal motion is not conducive to stable adsorption. If the temperature is below 95°C, although condensation is more complete, it can easily lead to blockage of the adsorbent pores by liquid moisture or sulfuric acid droplets, and the mass transfer efficiency between the organic matter already condensed on the fly ash surface and the adsorbent will decrease.

[0043] Precise selection and functional design of adsorbents: Not all activated carbons are suitable. Coconut shell-based activated carbon (ACY) has significant advantages over wood-based activated carbon (ACM), typically having a higher specific surface area (≥1200 m²). 2 / g) and more developed mesoporous (2-50nm) structures. Mesopores are advantageous for adsorbing high molecular weight n-Alkanes (such as C 28 - C34The presence of micropores (<2 nm) and PAEs (such as DEHP) is crucial, providing a rapid mass transfer channel and suitable adsorption space, avoiding the pore blockage and diffusion limitation problems that easily occur when relying solely on micropores (<2 nm). Furthermore, ACY surfaces are typically rich in more oxygen-containing functional groups (such as carboxyl, phenolic hydroxyl, and lactone groups). These polar functional groups exhibit specific and stronger adsorption affinity for polar PAE molecules through dipole-dipole interactions, hydrogen bonds, and even π-π conjugation effects—an advantage not possessed by ACMs, which are predominantly nonpolar or weakly polar surfaces. This chemical enhancement based on the "like dissolves like" principle is the fundamental reason why ACY has a significantly higher PAE removal efficiency than ACM.

[0044] Adaptive strategies under harsh operating conditions (high SO2, high dust): In high-sulfur flue gas, SO2 reacts with or competes for adsorption sites with functional groups on the surface of activated carbon; high dust levels cover the adsorbent surface. High mesopore volume offers significant advantages; the well-developed mesopore network provides numerous redundant adsorption sites and circuitous diffusion paths. Even if some pores are occupied by SO2 derivatives or fine ash, there is still sufficient effective surface area for adsorbing organic matter. Furthermore, setting the injection point before LLT-ESP allows the adsorbent sufficient residence time (typically >1 second) with the flue gas before capture for mixing and adsorption. Simultaneously, utilizing the high-efficiency capture capability of LLT-ESP, both the "adsorbent carrying organic pollutants" and the "fly ash carrying organic pollutants" are removed in one step, achieving synergistic purification.

[0045] Flue Gas Analysis and Monitoring Unit: This unit is responsible for real-time acquisition and analysis of flue gas state parameters upstream of the injection point. The sampling probe is located on the flue sidewall approximately 2-3 meters upstream of the SCR denitrification system outlet and the adsorbent injection point. The probe must have heating and backflushing functions to prevent flue gas condensation and blockage. The temperature sensor is a high-precision Pt100 thermocouple or resistance temperature detector (RTD), with a measurement range of 0-200°C and an accuracy of ±0.5°C, monitoring flue gas temperature in real time. The dust concentration monitor uses an online dust meter based on laser backscattering or charge induction principles to monitor dust concentration in the flue gas in real time. The SO2 concentration monitor uses differential ultraviolet absorption spectroscopy (DOAS) or tunable diode laser absorption spectroscopy (TDLAS) technology to monitor SO2 concentration in real time.

[0046] If feasible, the flue gas analysis and monitoring unit can incorporate AI algorithms to automatically adjust the adsorbent type and injection volume based on flue gas composition and load changes.

[0047] In this feasible embodiment, an adsorbent storage and supply unit is also included: responsible for storing, transporting, and accurately metering the required adsorbent. At least two vertical storage silos are provided, storing coconut shell-based activated carbon (ACY) and wood-based activated carbon (ACM) or other alternative adsorbents (such as modified activated carbon). The silo volume is designed according to the unit scale and expected consumption, and must include a level gauge, an arch-breaking device (vibrator or fluidization device), and drying / dehumidification functions. A precision metering and feeding device is the core equipment to ensure spraying accuracy. A combination of a rotary valve and a variable frequency screw feeder, or a loss-in-weight feeder, is preferred. The feeder outlet is connected to a pneumatic conveying system. The metering accuracy requirement is better than ±2%. The pneumatic conveying system is powered by a Roots blower or compressed air, transporting the adsorbent from the feeder to the spraying unit through pipelines. The pipeline material must be wear-resistant (such as a ceramic lining), and the layout should minimize bends to reduce resistance.

[0048] This embodiment achieves excellent removal performance by precisely controlling the microenvironment (temperature window) for adsorption and selecting the optimal adsorption medium (ACY). Experimental data show that spraying 150 mg / Nm³ of ACY at 101±4°C achieves removal efficiencies of 31.03% and 23.88% for n-Alkanes and PAEs, respectively. Compared to spraying ACM under the same conditions, the efficiencies are further improved by 3.94% and 9.54%, respectively; and compared to no spraying, the efficiency improvement exceeds 50%.

[0049] Directional injection unit: Responsible for uniformly and stably injecting the adsorbent into the optimal location within the flue. The injector typically uses a Venturi or turbine type, utilizing the negative pressure generated by high-speed airflow to draw in and mix the adsorbent before injection. The injector must be wear-resistant and clog-resistant. The injection gun array, depending on the flue size (e.g., a cross-section of 10m × 15m), consists of multiple injection guns (e.g., 4-6 guns) extending into the flue. The arrangement of the injection guns needs to be optimized through computational fluid dynamics simulation to ensure uniform coverage across the flue cross-section, avoiding dead zones or uneven concentration distribution. The injection gun opening direction should be opposite to or perpendicular to the flue gas flow direction to enhance turbulent mixing. The injection point must be set 5-15 meters upstream of the LLT-ESP. This distance ensures sufficient mixing and reaction time between the adsorbent and flue gas (typically designed to be 1-3 seconds), ensuring the adsorption process is essentially complete, while preventing premature sedimentation of the adsorbent due to gravity caused by excessive distance.

[0050] This embodiment proposes a solution to the "poisoning" and "clogging" problems that hinder the application of activated carbon injection technology in high-sulfur and high-dust flue gas. The high specific surface area and huge mesopore volume of ACY provide strong resistance to load shocks. Combined with a real-time fine-tuning injection strategy based on SO2 and dust concentration, it ensures stable and efficient operation of the system under complex conditions such as fuel changes and load fluctuations.

[0051] Based on the above solution, this embodiment achieves the following technical effects:

[0052] (1) High efficiency removal: Under conditions of 101±4℃, high sulfur and high dust, the ACY adsorbent achieves a removal efficiency of 150 mg / Nm³. 3 At the specified injection rate, the removal rates of n-alkanes and PAEs reached 31.03% and 23.88%, respectively, which were significantly higher than those of a single ESP system.

[0053] (2) High adaptability: It is especially suitable for complex fuel scenarios such as sludge co-firing and can effectively address the problem of increased organic pollutant emissions;

[0054] (3) Good economic efficiency: the adsorbent is widely available, the system requires little modification, and it is easy to integrate with the existing APCD system;

[0055] (4) Environmentally friendly: Through the synergistic effect of adsorption and dust removal, the emission of harmful organic matter in CPM is significantly reduced, meeting the requirements of ultra-low emission;

[0056] (5) Flexible operation: The type of adsorbent and the injection volume can be adjusted in real time according to the composition of flue gas, thus optimizing operating costs.

[0057] (6) Application scope: This system can also be applied to the control of SVOCs in fields such as waste incineration, steel sintering, and chemical waste gas.

[0058] Implementable examples of this embodiment include:

[0059] Experiment on activated carbon adsorbent injection coupled dust removal technology in a 300 MW coal-fired power unit demonstration project:

[0060] The activated carbon adsorbent injection point for the 300 MW coal-fired power unit demonstration project is located in the rising section of the pipeline after the air preheater, at the point where it bends vertically at 90° towards the horizontal flue. Each unit has two channels after the air preheater, with five spray guns installed on each branch flue. Multiple flue gas sampling points are set up on the flue gas system of the demonstration unit, with each unit having two flue channels. Sampling points are located at the inlet and outlet of the electrostatic precipitator, and all sampling holes are DN80 flange holes.

[0061] The following research was conducted on the activated carbon adsorbent injection coupled dust removal technology test in the 300MW coal-fired power unit demonstration project:

[0062] 1) Electrostatic precipitator inlet / outlet flue gas parameters (flue gas velocity, flue gas temperature, flue gas humidity, dust concentration, etc.);

[0063] 2) Changes in total hydrocarbon concentration at the inlet / outlet of the electrostatic precipitator in the raw flue gas;

[0064] 3) VOCs (volatile organic compounds) and SVOCs at the outlet of the electrostatic precipitator in the raw flue gas;

[0065] 4) Total hydrocarbon concentration, VOCs, and SVOCs at the outlet of the electrostatic precipitator after adsorbent injection;

[0066] 5) Changes in total hydrocarbon concentration at the electrostatic precipitator outlet under different adsorbent injection rates;

[0067] 6) Changes in total hydrocarbon concentration at the outlet of electrostatic precipitators with different adsorbents under the same injection volume.

[0068] The VOCs detection results are shown in Table 1. The total removal efficiency of 23 VOCs reached 77.59% (coconut shell activated carbon - 150 mg / Nm³). 3 ).

[0069] Table 1 VOCs detection results

[0070]

[0071] The SVOCs detection results are shown in Table 2. The total removal efficiency of 16 PAHs reached 77.74% (coconut shell activated carbon - 150 mg / Nm³). 3 ).

[0072] Table 2 SVOCs detection results

[0073]

[0074] Total hydrocarbon (THC) online detection results: YAC (coconut shell activated carbon) with different feed rates was injected, and samples were continuously collected for 30 minutes. The average of the valid data was taken as the valid result of online detection. As the YAC feed rate increased, the removal efficiency of THC also increased. When the feed rate increased to 150 mg / Nm³, the THC removal efficiency increased. 3 At that time, the total hydrocarbon removal efficiency was 87.31%; however, if the feed rate continued to increase, the total hydrocarbon removal efficiency did not improve significantly. According to the fitted curve equation, when the feed rate was 200 mg / Nm³, the total hydrocarbon removal efficiency improved evenly. 3 At that time, the removal efficiency was 88.35%, and the improvement in removal efficiency was only about 1%. Therefore, the adsorbent injection rate was selected as 150 mg / Nm³. 3 This is the most economical option, achieving a total hydrocarbon emission concentration of less than 0.72 mg / m³. 3 .

[0075] In summary, this embodiment provides an adsorption-enhanced removal system for organic pollutants in condensable particulate matter (CPM) in coal-fired power plants. The adsorbent adsorbs n-alkanes and PAEs in flue gas under high temperature and high dust conditions, and then gas-solid separation is achieved through a low-temperature electrostatic precipitator. The adsorbent and fly ash are captured together, thereby achieving the purpose of efficient removal of organic pollutants. This invention can operate stably and efficiently remove organic pollutants from CPM under high dust, medium-high temperature, and high-sulfur flue gas conditions.

[0076] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A system for efficient removal of organic pollutants, characterized in that, The system includes a denitrification unit, an adsorbent injection device, a low-temperature electrostatic precipitator, a wet flue gas desulfurization absorption tower, a high-pressure wet electrostatic precipitator, an injection control unit, and a flue gas analysis and monitoring unit. The denitrification unit is connected to a boiler at one end and sequentially connected to the adsorbent injection device, the low-temperature electrostatic precipitator, the wet flue gas desulfurization absorption tower, and the high-pressure wet electrostatic precipitator at the other end. The adsorbent injection device is installed in the flue before the inlet of the low-temperature electrostatic precipitator and is used to inject powdered activated carbon into the flue gas. The powdered activated carbon includes coconut shell-based activated carbon or wood-based activated carbon. The flue gas analysis and monitoring unit includes a sampling probe, which is installed at the outlet of the denitrification unit and on the side wall of the flue at a predetermined distance upstream of the injection point of the adsorbent injection device. It is used to collect and analyze flue gas state parameters in real time. Both the adsorbent injection device and the sampling probe are electrically connected to the injection control unit.

2. The system for efficiently removing organic pollutants according to claim 1, wherein It also includes an MGGH cooling unit, which is installed before the inlet of the low-temperature electrostatic precipitator to cool the flue gas to a preset temperature.

3. The system for efficiently removing organic pollutants according to claim 2, wherein The preset temperature is 95-105°C.

4. The system for efficiently removing organic pollutants according to claim 1, wherein It also includes an adsorbent storage and supply unit, which is connected to the adsorbent injection device and is used to store powdered activated carbon.

5. The high-efficiency organic pollutant removal system according to claim 1, characterized in that, The adsorbent storage and supply unit is equipped with a metering device.

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