A flue gas treatment device for a coal gas purification system

Abstract

The present application aims at providing a flue gas treatment device for a coal gas purification system, relating to the technical field of coal gas purification and air pollution control, comprising a first separation assembly, a dust removal assembly, a second separation assembly and a catalytic assembly connected in sequence, the first separation assembly removes coarse particles in flue gas through cyclone separation; the dust removal assembly adopts a honeycomb-shaped electrode channel combined with atomizing spraying in the channel, and makes submicron particles coagulate and grow through the "charged water mist heterogeneous nucleation" mechanism and then be efficiently captured by the electric field; the second separation assembly performs secondary separation to ensure the dust removal effect; the catalytic assembly adopts spatially layered design of SCR denitration catalyst and wet oxidation desulfurization catalyst, and cooperates with the strategy of graded injection of decreasing concentration gradient to solve the problem of mutual interference of desulfurization and denitration, with removal rate of 97% or above and removal rate of 90% or above. The present application solves the technical problems of low submicron particle capture efficiency, secondary dust raising of electrostatic precipitation, mutual interference of desulfurization and denitration and the like in the prior art.

Description

Technical Field

[0001] This invention relates to the field of coal gas purification and air pollution control technology, and in particular to a flue gas treatment device for a coal gas purification system. Background Technology

[0002] The flue gas produced in industrial processes such as coal gasification, coking, and iron and steel smelting contains a large amount of dust (including submicron particles smaller than PM2.5). , Various pollutants, including those mentioned above, must undergo advanced purification treatment before they can be discharged in compliance with standards. Existing flue gas treatment technologies mainly suffer from the following technical problems:

[0003] (1) Secondary dust generation problem of electrostatic precipitators. In traditional dry electrostatic precipitators, the dust already collected on the surface of the collecting electrode is re-raised and enters the airflow during the rapping cleaning process, resulting in a sudden increase in the dust concentration at the outlet. Especially for submicron particles (PM0.1-PM2.5), the efficiency loss caused by secondary dust generation can reach 10%-20%. In addition, when dry ESPs are used to treat high-humidity flue gas, dust tends to agglomerate on the collecting electrode plates, making rapping cleaning difficult and reducing operational reliability.

[0004] (2) Low capture efficiency of submicron particles. Submicron particles (0.1-1μm) are in the "most difficult particle size range to capture". Their charge efficiency and migration speed in the electric field are both low. The capture efficiency of traditional plate or tube ESP for particles in this size range is only 70%-85%, which is difficult to meet the increasingly stringent ultra-low emission requirements (dust ≤5mg / m³).

[0005] (3) Mutual interference problem between desulfurization and denitrification systems. In existing integrated desulfurization and denitrification technologies, when using… When denitrification is assisted by strong oxidants, the oxidant will react with the denitrification reducing agent (such as... A competitive reaction occurs, leading to Ineffective consumption leads to decreased denitrification efficiency. Conversely, when SCR denitrification and wet desulfurization are carried out in the same equipment, the high-temperature SCR catalyst has extremely low activity under low-temperature wet desulfurization conditions, and the operating temperature windows of the two reactions are mismatched.

[0006] (4) Scaling and corrosion problems in equipment. In traditional spray scrubbing towers, the scrubbing liquid is dispersed in the airflow in the form of droplets, resulting in a limited gas-liquid contact area. Furthermore, the nozzles are easily clogged by dust, leading to scaling. When high-temperature flue gas directly enters downstream equipment, the thermal stress caused by temperature fluctuations and the corrosion caused by acidic condensate severely affect the equipment's lifespan.

[0007] (5) Various flue gas treatment devices have been disclosed in the prior art. For example, Chinese patent CN224442652U discloses an integrated device for desulfurization, denitrification, and waste heat recovery of red mud particles. However, the dust removal, desulfurization, and denitrification functions of this device are relatively independent, and the problem of mutual interference between efficient collection of submicron particles and desulfurization and denitrification has not been solved. Chinese patent CN119838756A discloses a honeycomb dual-zone electrostatic precipitator. However, its charging zone and dust collection zone are separated, the structure is complex, and it is a dry dust removal method, which has the problem of secondary dust generation. Chinese patent CN104941431A discloses a device based on The desulfurization and denitrification equipment, but its Using a single injection method, with the injection point at the flue gas inlet, presents... Ineffective decomposition at high temperatures (decomposes into compounds above 120°C). and ) and with The problem lies in the competing reactions, resulting in low oxidation efficiency. Chinese patent CN201310457190.5 discloses a device and method for simultaneous desulfurization and denitrification of flue gas based on hydrogen peroxide catalytic oxidation, but it does not address dust removal functionality, and... A staged injection strategy was not adopted. Furthermore, while the existing technology, "A Desulfurization, Denitrification, and Dust Removal System" (Publication No. CN201710683560), integrates honeycomb packing desulfurization, electrostatic precipitator, and SCR denitrification, its dust removal uses separate dry and wet electrostatic precipitators, resulting in a complex structure and unresolved issues. and The problem of mutual interference.

[0008] Therefore, there is an urgent need for a method that can integrate cyclone pre-separation, honeycomb electrostatic dust removal (including atomized spraying within the channel), and dual-catalyst stratified desulfurization and denitrification into one unit, and through... Tiered injection strategy avoids A competitive reaction-based synergistic flue gas treatment device. Summary of the Invention

[0009] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a flue gas treatment device for a coal gas purification system, which solves the technical problems of low submicron particle capture efficiency, secondary dust generation during electrostatic precipitator cleaning, mutual interference between desulfurization and denitrification, and equipment scaling and corrosion in existing coal gas flue gas treatment devices.

[0010] Technical solution To achieve the above objectives, the present invention provides the following technical solution: a flue gas treatment device for a coal gas purification system, comprising a first separation component, a dust removal component, a second separation component, and a catalytic component connected in sequence; the first separation component is connected to the flue gas introduced into the coal gas system and is used for cyclone separation of coarse particles in the flue gas; the dust removal component is disposed on the exhaust pipe of the first separation component and is used for electrostatic capture of submicron particles in the flue gas; the second separation component has the same structure as the first separation component and is used for secondary separation of the flue gas, and a heat exchanger is connected between the second separation component and the first separation component; the catalytic component is connected to the second separation component and is used for desulfurization and denitrification catalytic treatment of the flue gas.

[0011] Furthermore, the first separation component includes an acceleration fan, a three-way connector, a housing, an exhaust pipe, a dust collection hopper, and a smart control valve. The housing is located on the site of use. One end of the acceleration fan is connected to the upper end of the housing through the three-way connector and is located in the tangential direction of the housing. The exhaust pipe is fixed to the center of the housing. The dust collection hopper is located below the housing. The smart control valve is located at the upper end of the exhaust pipe.

[0012] Furthermore, the shell is divided into upper and lower sections, with the upper section being a cylindrical structure and the lower section being a conical structure; the inner side of the upper section of the shell is provided with an inverted conical guide platform, and the outer side of the guide platform is provided with a surrounding guide plate; the inner side of the lower section of the shell is provided with a swirl plate.

[0013] Furthermore, the intelligent control valve is a three-way valve, and a detection device is provided below the intelligent control valve to detect the content of various substances in the flue gas. When the particles in the flue gas are removed to a preset value, the flue gas is sent into the second separation component. The flue gas that does not meet the standard is separated and dusted again through the three-way interface.

[0014] Furthermore, the dust removal component includes an electrode channel and a spray pipe. The electrode channel is a honeycomb structure formed by multiple regular hexagonal channels and is made of conductive silicon carbide ceramic. A nickel-chromium alloy wire electrode is provided at the center of the channel and connected to an external high-voltage direct current. The spray pipe passes through the electrode channel and has atomizing nozzles on its side. The positions of the atomizing nozzles match the intervals between the electrode channels.

[0015] Furthermore, the spray pipe is connected to an external water supply device, and the atomizing nozzle generates water mist with a particle size of 10-50μm. The water mist is charged under the action of the ion flow generated by the corona discharge. The charged water mist acts as a heterogeneous nucleation center, causing submicron particles to condense and grow to 1-10μm before being driven by the electric field force to be captured on the honeycomb wall.

[0016] Furthermore, the second separation component has the same structure as the first separation component, and a heat exchanger is connected between the second separation component and the first separation component.

[0017] Furthermore, the catalytic assembly includes a first catalytic zone, an injection zone, and a second catalytic zone arranged sequentially along the flue gas flow direction. An annular injection grille is provided above the first catalytic zone, and the first catalytic zone is filled with... - / Honeycomb SCR catalyst, wherein an injection assembly is provided on the side of the injection area for... The second catalytic region is filled with staged injection. - / Activated carbon granular catalyst.

[0018] Furthermore, the injection area is provided with multiple injection sections along the axial direction, and each section has... The concentration decreases gradually along the airflow direction, at the first injection section. The concentration is 20-30 wt%, and the last injection section is... Concentration of 3-8 wt% Total amount by / Molar ratio 2.0 control.

[0019] Furthermore, the inlet of the catalytic assembly is equipped with a heating device connected to a heat exchanger to raise the flue gas temperature to the SCR catalyst's activity temperature window of 150-250°C; the nozzles of the injection grille are supplied with liquid via an external liquid supply device. , / The molar ratio is 0.8-1.2.

[0020] Beneficial effects The present invention has the following beneficial effects: (1) Solved the technical problem of efficient capture of submicron particles. Through the synergistic mechanism of "honeycomb electrostatic dust removal + channel atomized spraying + corona charging", water mist acts as a heterogeneous nucleation center to cause submicron particles to condense and grow. Charged droplets migrate at high speed to the wall surface in the electric field and are captured. The capture efficiency of particles below PM2.5 can reach more than 97%, which is 15-25 percentage points higher than that of traditional dry ESP.

[0021] (2) The technical problem of secondary dust generation in electrostatic precipitators has been solved. The honeycomb electrode channel combined with spray water mist allows the dust to be captured by the water mist and fall into the dust collection hopper under gravity, thus eliminating the problem of secondary dust generation in the traditional rapping cleaning process.

[0022] (3) The technical problem of mutual interference between desulfurization and denitrification was solved. This was achieved through "dual-catalyst spatial stratification +..." The design of "staged injection with decreasing concentration gradient" spatially separates SCR denitrification and wet catalytic oxidation desulfurization. Injecting downstream of the SCR region to avoid [unclear] Competitive response, comprehensive The removal rate reached over 97%. The removal rate is over 90%.

[0023] (4) The technical problems of scaling and corrosion of equipment have been solved. The guide plate and cyclone plate structure of the cyclone separation component realize the orderly flow of flue gas, and the scraper mechanism of the dust collection hopper prevents dust accumulation and scaling. The system can operate stably for a long time under high dust conditions.

[0024] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 This is a cross-sectional view of the housing structure of the first separation component of the present invention; Figure 3 This is a schematic diagram of the dust removal component of the present invention; Figure 4 This is a cross-sectional view of the catalytic component of the present invention.

[0026] Reference numerals: First separation component 1; Air inlet 101; Accelerator fan 102; T-junction 103; Guide platform 104; Guide plate 105; Swirl plate 106; Housing 107; Exhaust pipe 108; Dust collection hopper 109; Intelligent control valve 110; Dust removal component 2; Electrode channel 201; Spray pipe 202; Second separation component 3; Catalytic component 4; Injection grille 401; First catalytic zone 402; Injection zone 403; Injection component 404; Second catalytic zone 405; Heat exchanger 5. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 - Figure 4This invention provides a technical solution: a flue gas treatment device for a coal gas purification system includes a first separation component 1, a dust removal component 2, a second separation component 3, and a catalytic component 4. The first separation component 1 is connected to the coal gas system to introduce flue gas and separate particulate matter from the flue gas. The dust removal component 2 is located inside the first separation component 1 and can remove tiny particles from the flue gas. The second separation component 3 can further separate particulate matter from the flue gas. The catalytic component 4 is connected to the second separation component 3 and can catalyze the flue gas to reduce its pollution.

[0029] like Figure 2 As shown, the flue gas treatment device for the coal gas purification system includes a first separation component 1. The first separation component 1 includes an accelerating fan 102, a three-way interface 103, a housing 107, an exhaust pipe 108, a dust collection hopper 109, and a smart control valve 110. The housing 107 is installed on the site of use. One end of the accelerating fan 102 is connected to the upper end of the housing 107 through the three-way interface 103, and this connection is located in the tangential direction of the housing 107. The exhaust pipe 108 is fixed to the center of the housing 107. The dust collection hopper 109 is located below the housing 107. The smart control valve 110 is located at the upper end of the exhaust pipe 108. The housing 107 is divided into upper and lower sections. The upper section of the housing 107 has a cylindrical structure. A guide platform 104 is provided on the inner side of the upper section of the housing 107. The guide platform 104 has an inverted conical structure. A guide plate 105 is provided on the outer side of the guide platform 104, and the guide plate 105 surrounds the guide platform 108. 4. The guide plate 105 is divided into upper and lower groups. The upper guide plate 105 is connected to the top of the housing 107, and the lower guide plate 105 is located in the middle of the guide platform 104. The lower section of the housing 107 has a conical structure. A swirl plate 106 is provided on the inner side of the housing 107. The swirl plate 106 is located in the middle of the housing 107. The guide plate 105 is inclined, and the inclination direction of the guide plate 105 matches the spiral direction of the swirl plate 106. The dust collection hopper 109 has an outlet and is connected to an external sewage and dust discharge device. A detection device is provided below the intelligent control valve 110 for detecting the content of various substances in the flue gas. The intelligent control valve 110 is a three-way valve. An inlet is provided below the intelligent control valve 110 and connected to the exhaust pipe 108. Two outlets are provided above the intelligent control valve 110. One outlet is connected to the three-way interface 103, and the other outlet is connected to the second separation component 3.

[0030] In a specific embodiment: during use, the flue gas is connected to the gas system through the air inlet 101, thereby sending the flue gas into this flue gas treatment device. Then, the accelerator fan 102 is started by an external power supply to accelerate the flue gas, which then enters the first separation component 1 through the three-way interface 103. Since the three-way interface 103 is connected to the tangential direction of the upper end of the housing 107, when the flue gas enters, it will accumulate and rotate above the housing 107. At the same time, under the action of the guide platform 104, the rotation of the flue gas is orderly. Furthermore, under the action of the inverted conical structure of the guide platform 104, the flue gas will rotate towards the periphery of the housing 107. Meanwhile, the inclined guide plate 105 will guide the flue gas downward, especially the guide plate 105 connected to the top of the housing 107, which will prevent the accumulation of flue gas. At the top of the shell 107, the flue gas in the upper section of the shell 107 flows downward while rotating, thus entering the conical structure of the lower section of the shell 107. Under the action of the swirl plate 106, the flue gas forms a spiral movement. Due to the conical structure at the lower end of the shell 107, the cross-section of the flue gas flow cavity becomes smaller and smaller under the action of the swirl plate 106, thus making the flue gas flow faster and faster. The flue gas rotates and descends at high speed towards the lower section of the shell 107 until it reaches the bottom of the shell 107. The particles in the flue gas are thrown towards the side wall of the shell 107 under the action of centrifugal force. Once the particles come into contact with the side wall of the shell 107, they lose inertial force, and the momentum of the downward axial velocity near the side wall of the shell 107 falls along the wall and enters the dust collection hopper 109 for centralized treatment.

[0031] Simultaneously, the descending flue gas flow continuously flows into the center of the casing 107 during its descent, forming a centripetal radial airflow. This airflow constitutes the upward rotating inner vortex. The inner and outer vortices rotate in the same direction. Finally, the purified and dust-removed flue gas enters the exhaust pipe 108 from the top.

[0032] Then, under the detection of the detection device located below the intelligent control valve 110, when the particles in the flue gas are removed to a certain preset value, the purified flue gas will be sent into the second separation component 3. The flue gas that has not reached the preset value will be sent back into the three-way interface 103 through the connecting pipe and separated and dusted again.

[0033] In a specific embodiment: the dust collection hopper 109 is equipped with a scraper driven by a motor to scrape off particulate dust in the dust collection hopper 109, making it easy to collect and discharge.

[0034] In a specific embodiment: the second separation component 3 has the same structure as the first separation component 1, and a heat exchanger 5 is connected between the second separation component 3 and the first separation component 1.

[0035] like Figure 3As shown, the flue gas treatment device for the gas purification system includes a dust removal component 2. The dust removal component 2 includes an electrode channel 201 and a spray pipe 202. The electrode channel 201 is fixed to the exhaust pipe 108 at certain intervals. The electrode channel 201 is a honeycomb structure formed by multiple regular hexagonal channels. The electrode channel 201 is made of conductive silicon carbide ceramic. An electrode (not shown) is provided at the center of the regular hexagonal channel of the electrode channel 201. The electrode is made of nickel-chromium alloy wire and is connected to an external high-voltage direct current. The spray pipe 202 is set inside the exhaust pipe 108 and is connected to an external water supply device. The spray pipe 202 passes through the electrode channel 201. The side of the spray pipe 202 is provided with atomizing nozzles. The position of the atomizing nozzles matches the interval between the electrode channels 201, so that there is an atomizing nozzle above each electrode channel 201.

[0036] In a specific embodiment: during use, the flue gas in the exhaust pipe 108 rises and passes through the dust removal component 2.

[0037] The spray pipe 202 is supplied with water through an external water supply device, and sprays water through atomizing nozzles. Small water droplets capture particles and microparticles in the flue gas. At the same time, a large number of water droplets will converge into the electrode channel 201, forming a stream of water that carries the particles and microparticles in the flue gas into the dust collection hopper 109, thus forming an auxiliary dust removal and separation process.

[0038] The electrodes in electrode channel 201 generate corona discharge through a high-voltage current, and the corona discharge produces an ultra-high concentration (approximately - The negative ions (number per cm³) attach to the surface of particles and water droplets within a very short time (0.1-1 ms), charging them. Simultaneously, the water droplets become charged in the ion stream generated by corona discharge (approximately [amount missing]). - C), the charged water mist collides and condenses with submicron particles in the electrode channel 201, thereby capturing particles and microparticles in the flue gas with an ultra-high capture rate (≥98%), thus achieving the effect of dust removal.

[0039] like Figure 4 As shown, the flue gas treatment device for the coal gas purification system includes a catalytic component 4. The catalytic component 4 includes a first catalytic zone 402, an injection zone 403, and a second catalytic zone 405. The first catalytic zone 402 is located at the upper end of the catalytic component 4, the injection zone 403 is located in the middle of the catalytic component 4, and the second catalytic zone 405 is located at the lower end of the catalytic component 4. A spray grille 401 is provided above the first catalytic zone 402. The spray grille 401 is located at the inlet of the catalytic component 4. The spray grille 401 is annular, and multiple nozzles are provided below the spray grille 401. The first catalytic zone 402 is filled with... (1.5%)- (5%) / Honeycomb SCR catalyst (pore density 400 cpsi); The injection area 403 is provided with an injection component 404 on its side, which can perform injection. The injection is performed in stages, with the injection zone 403 having four injection sections along the axial direction, each section having a certain spacing. Each section... The concentrations were: 25 wt% for the first section, 18 wt% for the second section, 12 wt% for the third section, and 5 wt% for the fourth section. Total amount by / Molar ratio 2.0 control.

[0040] The second catalytic region 405 is filled with (10%)- (5%) / Activated carbon granular catalyst.

[0041] In a specific embodiment: the inlet front end of the catalytic component 4 is provided with a heating device connected to the heat exchanger 5, thereby increasing the temperature of the flue gas and improving the catalytic efficiency.

[0042] The nozzle can be supplied with liquid via an external liquid supply device. The supply, flow rate is from the SCR catalyst outlet Concentration feedback control / The molar ratio is set to 1.0.

[0043] In a specific embodiment: To verify the dust removal, desulfurization, and denitrification effects of the present invention, the inventors conducted the following performance test experiments: Experimental conditions: flue gas treatment capacity of 10000 m³ / h, initial flue gas temperature of 250℃, and dust concentration of 10 g / m³ (of which PM2.5 accounted for approximately 35% and PM0.1-PM1 accounted for approximately 15%). Initial concentration 2000 mg / m³ Initial concentration: 500 mg / m³.

[0044] Experiment 1 (Dust Removal Efficiency Test): Accelerator fan 102 speed 1450 r / min, electrode channel 201 voltage 55kV, atomizing nozzle water mist particle size 30μm, spray water volume 1.5L / ( Under the condition of [condition missing], the collection efficiency of particles of different sizes was tested. The test results are as follows: the collection efficiency for coarse particles ≥10μm was 99.5%, for particles of 2.5-10μm it was 99.2%, for particles of 1-2.5μm it was 98.6%, for particles of 0.3-1μm it was 97.8%, and for particles of 0.1-0.3μm it was 96.2%. The overall collection efficiency for particles below PM2.5 was 97.5%, and the outlet dust concentration was ≤4.5mg / m³, meeting the national ultra-low emission standard (dust ≤5mg / m³).

[0045] Experiment 2 (Desulfurization and Denitrification Efficiency Test): At a temperature of 180℃ in the SCR catalytic zone, / Molar ratio 1.0 Staged injection (first section 25wt%, second section 18wt%, third section 12wt%, fourth section 5wt%) / The test was conducted under the conditions of a molar ratio of 2.0 and a temperature of 70℃ in the second catalytic zone (405). The test results are as follows: SCR catalytic zone The conversion rate was 92.5%. Injection zone 403 will contain the residual (Approximately 37.5 mg / m³) oxidized to The conversion rate was 85%, and the second catalytic zone was 405. The conversion rate was 97.3%. The further removal rate was 32%. (Overall) The overall removal rate is 92.5% + (1 - 92.5%) × 85% × 32% ≈ 94.5%, and the overall SO2 removal rate is 97.3%. (Export) Concentration ≤27.5mg / m³, outlet The concentration is ≤54mg / m³, which meets the national ultra-low emission standards.

[0046] Experiment 3 (Long-term operational stability test): Under the above experimental conditions, the system was operated continuously for 720 hours (30 days), and the outlet dust concentration was recorded every 24 hours. Concentration and Concentration. Test results show that the outlet dust concentration fluctuated between 3.8 and 5.2 mg / m³ (average 4.5 mg / m³), and the SO2 concentration fluctuated between 42 and 65 mg / m³ (average 54 mg / m³). The concentration fluctuated between 22-35 mg / m³ (average 27.5 mg / m³). The system operated stably without scaling or clogging. The water film on the wall of the honeycomb electrode channel 201 was continuous and uniform, and the scraper mechanism of the dust collection hopper 109 operated normally.

[0047] Experiment 4 (Comparative Experiment): Under the same flue gas conditions, the PM0.3 submicron particle capture efficiency was tested for a traditional dry plate-type ESP (Comparative Group 1), a honeycomb electrostatic precipitator with channelless internal atomization spray (Comparative Group 2), and the device of this invention (Experimental Group). The capture efficiency of Comparative Group 1 was 78.5%, that of Comparative Group 2 was 89.2%, and that of the Experimental Group was 96.2%. The experimental results show that this invention, through the "charged water mist heterogeneous nucleation" mechanism, increases the PM0.3 submicron particle capture efficiency from 78.5% of the traditional dry ESP to 96.2%, an increase of 17.7 percentage points.

[0048] Working principle: Dust-laden flue gas undergoes cyclone pre-separation in the first separation component 1. Coarse particles are thrown against the side wall of the shell 107 and fall into the dust collection hopper 109 under centrifugal force. After passing the test, the flue gas passes through the dust removal component 2. Negative ions generated by corona discharge in the honeycomb electrode channel 201 charge the particles and water mist. The charged water mist acts as heterogeneous nucleation centers, causing submicron particles to condense and grow before being efficiently captured by the electric field. After being separated again by the second separation component 3, the flue gas enters the catalytic component 4, first passing through the first catalytic zone 402. Denitrification, then The staged injection zone 403 will contain the residual Oxidized to Finally, desulfurization is achieved through catalytic oxidation in the second catalytic zone (405). and synergistic and efficient removal.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flue gas treatment device for a coal gas purification system, characterized in that, The system includes a first separation component (1), a dust removal component (2), a second separation component (3), and a catalytic component (4) connected in sequence. The first separation component (1) is connected to the gas system to introduce flue gas and is used to cyclone separate coarse particles in the flue gas. The dust removal component (2) is located on the exhaust pipe (108) of the first separation component (1) and is used to electrostatically capture submicron particles in the flue gas. The second separation component (3) has the same structure as the first separation component (1) and is used to perform secondary separation of the flue gas. A heat exchanger (5) is connected between the second separation component (3) and the first separation component (1). The catalytic component (4) is connected to the second separation component (3) and is used to perform desulfurization and denitrification catalytic treatment on the flue gas.

2. The flue gas treatment device for a gas purification system according to claim 1, characterized in that, The first separation component (1) includes an acceleration fan (102), a three-way interface (103), a housing (107), an exhaust pipe (108), a dust collection hopper (109), and a smart control valve (110). The housing (107) is located on the site of use. One end of the acceleration fan (102) is connected to the upper end of the housing (107) through the three-way interface (103) and is located in the tangential direction of the housing (107). The exhaust pipe (108) is fixed to the center of the housing (107). The dust collection hopper (109) is located below the housing (107). The smart control valve (110) is located at the upper end of the exhaust pipe (108).

3. The flue gas treatment device for a coal gas purification system according to claim 2, characterized in that, The shell (107) is divided into upper and lower sections. The upper section is cylindrical and the lower section is conical. The upper section of the shell (107) is provided with an inverted conical guide platform (104) on its inner side. The guide platform (104) is provided with a surrounding guide plate (105) on its outer side. The guide plate (105) is divided into upper and lower groups. The upper guide plate (105) is connected to the top of the shell (107), and the lower guide plate (105) is located in the middle of the guide platform (104). The lower section of the shell (107) is provided with a swirl plate (106) on its inner side. The guide plate (105) is inclined and the inclination direction matches the spiral direction of the swirl plate (106).

4. The flue gas treatment device for a gas purification system according to claim 2, characterized in that, The intelligent control valve (110) is a three-way valve. A detection device is provided below the intelligent control valve (110) to detect the content of various substances in the flue gas. The intelligent control valve (110) has an inlet connected to an exhaust pipe (108) below and two outlets above. One outlet is connected to a three-way interface (103) for the return of substandard flue gas, and the other outlet is connected to a second separation component (3) for the delivery of compliant flue gas.

5. The flue gas treatment device for a gas purification system according to claim 1, characterized in that, The dust removal assembly (2) includes an electrode channel (201) and a spray pipe (202). The electrode channel (201) is a honeycomb structure formed by multiple regular hexagonal channels. The electrode channel (201) is made of conductive silicon carbide ceramic. An electrode is provided at the center of the regular hexagonal channel of the electrode channel (201). The electrode is made of nickel-chromium alloy wire and is connected to an external high-voltage direct current. The spray pipe (202) is located inside the exhaust pipe (108) and passes through the electrode channel (201). The spray pipe (202) has atomizing nozzles on its side. The position of the atomizing nozzles matches the spacing between the electrode channels (201).

6. The flue gas treatment device for a gas purification system according to claim 5, characterized in that, The spray pipe (202) is connected to an external water supply device. The atomizing nozzle generates water mist with a particle size of 10-50μm. The water mist is charged under the action of the ion flow generated by the corona discharge. The charged water mist acts as a heterogeneous nucleation center, causing submicron particles to condense and grow to 1-10μm before being driven by the electric field to the honeycomb wall for capture.

7. The flue gas treatment device for a gas purification system according to claim 5, characterized in that, The electrode channels (201) are fixed to the exhaust pipe (108) at certain intervals, and the concentration generated by the corona discharge is... - indivual / The negative ions attach to the surface of particles and water droplets within 0.1-1 ms, charging them with a charge of [missing value]. - C.

8. The flue gas treatment device for a gas purification system according to claim 1, characterized in that, The catalytic assembly (4) includes a first catalytic zone (402), an injection zone (403), and a second catalytic zone (405) arranged sequentially along the flue gas flow direction. A spray grille (401) is provided above the first catalytic zone (402). The spray grille (401) is annular and has multiple nozzles below it. The first catalytic zone (402) is filled with… - / A honeycomb SCR catalyst, wherein an injection assembly (404) is provided on the side of the injection region (403) for... The second catalytic region (405) is filled with staged injection. / Activated carbon granular catalyst.

9. The flue gas treatment device for a gas purification system according to claim 8, characterized in that, The injection zone (403) is provided with multiple injection sections along the axial direction, and each section has... The concentration decreases gradually along the airflow direction, at the first injection section. The concentration is 20-30 wt%, and the last injection section is... Concentration of 3-8 wt% Total amount by / Molar ratio 2.0 control.

10. The flue gas treatment device for a gas purification system according to claim 8, characterized in that, The inlet of the catalytic assembly (4) is equipped with a heating device connected to a heat exchanger (5) to raise the flue gas temperature to the SCR catalyst's activity temperature window of 150-250°C; the nozzles of the injection grille (401) are supplied with liquid via an external liquid supply device. , / The molar ratio is 0.8-1.2.

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