Flue gas desulfurization particulate matter purification system

Abstract

This disclosure relates to a flue gas desulfurization particulate matter purification system, including a purification device, a flushing spray device, a mixed liquid collection device, a chimney wall condensate collection device, and a control unit. The purification device includes a separator purifier installed at the flue outlet at the top of the desulfurization tower, the separator purifier having honeycomb-shaped blades capable of capturing particulate matter in the flowing flue gas; the flushing spray device is installed above the separator purifier for flushing the honeycomb-shaped blades; the mixed liquid collection device is installed below the separator purifier for collecting the separated mixed liquid carrying particulate matter; the chimney wall condensate collection device is installed at the chimney inlet at the top of the desulfurization tower for collecting the condensate generated during the heat exchange between the flue gas and the chimney wall during the flow of flue gas; the control unit is signal-connected to both the separator purifier and the flushing spray device. This purification system can enhance the capture and separation capability of particulate matter in the desulfurized flue gas, achieving ultra-low emissions of flue gas particulate matter.

Description

Technical Field

[0001] This disclosure relates to the field of industrial flue gas purification technology, and more specifically, to a flue gas desulfurization particulate matter purification system. Background Technology

[0002] Flue gas emissions from industrial coal-fired and gas-fired boilers and chemical plants are the main source of atmospheric particulate matter pollution. Ammonia-based desulfurization technology is widely used in the power and chemical industries due to its advantages, such as desulfurization efficiency exceeding 98% and the recoverability of the byproduct ammonium sulfate. However, this process is accompanied by significant particulate matter pollution problems. The emitted particulate matter includes dust particles (1-50 μm in diameter), desulfurization product crystalline particles (ammonium sulfate and ammonium sulfite, 0.5-10 μm in diameter), and droplet-entrained particles (droplet diameter 5-50 μm, containing soluble salts). Improper treatment can lead to serious exceedances of emission standards.

[0003] In related technologies, demisters are used in conjunction with water washing spray to treat particulate matter in flue gas after desulfurization. However, this method has significant drawbacks, mainly manifested in the following issues: First, existing demisters, under high gas velocities above 2.8 m / s in the empty desulfurization tower, have a removal efficiency of less than 30% for particles with a diameter of 8 μm or smaller, making it difficult to meet the ultra-low standard of particulate matter emission concentration ≤5 mg / Nm³, especially lacking the ability to capture submicron-sized aerosols; Second, the traditional "water washing spray + demister" combined system has poor operational stability, and the spray nozzles are prone to clogging due to ammonium sulfate crystallization (within 3 months). The following issues have been identified: First, the internal coverage rate has decreased from 100% to below 60%. Scaling on the demister blades has increased resistance by more than 50%, forcing frequent system shutdowns for maintenance, with annual maintenance exceeding 30 days. Second, the desulfurization and purification processes lack coordinated design; a ±40% deviation in flue gas velocity within the desulfurization tower means that 10%-15% of particulate matter enters subsequent stages without contacting the desulfurization liquid, significantly increasing the purification load. Third, ammonia escape forms NH4HSO3 and (NH4)2SO4 aerosol particles, accounting for 20%-30% of total emissions. Traditional equipment cannot effectively capture these particles, leading to persistently excessive outlet concentrations. With the upgrading of environmental standards, existing technologies can no longer meet the ultra-low emission requirements of ≤5mg / Nm³ for particulate matter, necessitating innovative purification technologies. Summary of the Invention

[0004] The purpose of this disclosure is to provide a flue gas desulfurization particulate matter purification system to at least partially solve the problems existing in the related art.

[0005] To achieve the above objectives, this disclosure provides a flue gas desulfurization particulate matter purification system for purifying particulate matter in flue gas after desulfurization in a desulfurization tower. The flue gas desulfurization particulate matter purification system includes:

[0006] The purification device includes a separation purifier installed at the flue outlet at the top of the desulfurization tower. The separation purifier has honeycomb-shaped blades capable of capturing particulate matter in the through-flow flue gas to achieve gas-liquid separation. A rinsing spray device is installed above the separator and purifier to rinse the honeycomb structure blades; A mixture collection device is installed below the separator and purifier to collect the separated mixture containing particulate matter. A condensate collection device is installed at the top of the desulfurization tower at the chimney inlet to collect the condensate generated during the heat exchange between the flue gas and the chimney wall as the flue gas flows through; and The control unit is connected to both the separator and the rinsing spray device via signal connection, and controls the rinsing spray device to turn on or off by receiving signals from the separator.

[0007] Optionally, the honeycomb structure blade is constructed as a plate-shaped structure, and the plate-shaped structure has gas channels inside to form a honeycomb structure.

[0008] Optionally, the honeycomb structure blade has a first baffle on the flue gas inlet side and a second baffle on the flue gas outlet side. The first baffle and the second baffle are respectively provided with a plurality of distribution holes for flue gas to enter and exit, and the first baffle and the second baffle are respectively fixedly connected to the honeycomb structure blade.

[0009] Optionally, the separator is constructed as a vertically arranged cylindrical structure, the sidewalls of the cylindrical structure are made of honeycomb structure blades, a first sealing plate is provided at the bottom of the cylindrical structure, and a second sealing plate is provided between the top edge of the cylindrical structure and the inner wall of the desulfurization tower.

[0010] Optionally, the cylindrical structure is a polyhedral cylindrical structure, each sidewall of the polyhedral cylindrical structure is constructed from multiple honeycomb-shaped blades, and each sidewall of the polyhedral cylindrical structure is evenly distributed in a circumferential array.

[0011] Optionally, the purification device further includes a support frame, which is fixedly connected to the tower wall of the desulfurization tower, and the separator is fixedly installed on the support frame.

[0012] Optionally, the rinsing spray device includes a spray pipe and a plurality of nozzles installed on the spray pipe, the spray pipe being located above and surrounding the separator, and the nozzles being inclined downward and facing the honeycomb structure blades.

[0013] Optionally, the mixed liquid collection device includes a mixed liquid collection tank and a first downcomer pipe. The mixed liquid collection tank is located below the separator and purifier and directly opposite the honeycomb structure blades. The first downcomer pipe is connected to the mixed liquid collection tank and a condensate collection tank outside the desulfurization tower. A water baffle is provided on the top of the mixed liquid collection tank.

[0014] Optionally, the chimney wall condensate collection device includes a chimney wall condensate collection tank and a second downcomer. The chimney wall condensate collection tank is fixedly installed at the chimney inlet at the top of the desulfurization tower and is arranged around the inner wall of the chimney. The second downcomer is connected to the chimney wall condensate collection tank and a condensate collection tank outside the desulfurization tower.

[0015] Optionally, the control unit includes a controller and a pressure detection element. The controller is signal-connected to both the flushing spray device and the pressure detection element. The pressure detection element is installed in both the flue gas inlet and outlet flue gas ducts of the separator / purifier to detect the pressure difference between the flue gas inlet and outlet of the separator / purifier. When the pressure difference between the flue gas inlet and outlet of the separator is greater than or equal to a first preset value, the controller controls the flushing spray device to turn on. When the pressure difference between the flue gas inlet and outlet of the separator is less than or equal to the second preset value, the controller controls the flushing spray device to shut down.

[0016] Through the above technical solution, the desulfurized flue gas enters the separator and purifier. Under the forced flow guidance of the honeycomb-structured blades, the flow field changes direction, generating centrifugal force. Liquid droplets in the flue gas collide with the honeycomb-structured blades under the action of centrifugal force, forming a liquid film. The liquid film coalesces and flows into the mixed liquid collection device below under the action of gravity, thereby achieving gas-liquid separation. Most of the particles of 8μm and below in the flue gas are captured and finally discharged through the outlet flue. At the same time, the condensate generated by the heat exchange between the flue gas and the chimney wall during the flow flows along the tower wall to the chimney wall condensate collection device, which works in conjunction with the mixed liquid collection device to complete gas-liquid separation and particulate matter collection. In addition, the control unit monitors the status of the separator and purifier in real time and controls the flushing spray device to flush the honeycomb-structured blades in a timely and appropriate manner, maintaining a dynamic balance between the cleanliness of the honeycomb-structured blades and the separation efficiency. Throughout the process, the purification unit, flushing spray unit, mixed liquor collection unit, chimney wall condensate collection unit, and control unit operate in concert, ensuring stable purification within an operational flexibility range of 30%-110%. The residence time of flue gas in the separator is 35.2-77.44 minutes, ensuring deep purification. The purification unit, flushing spray unit, mixed liquor collection unit, chimney wall condensate collection unit, and control unit form an integrated deep purification system through parameter matching, ensuring a stable overall pressure drop of 0.19-0.94 kPa, achieving synergistic efficiency across all components, and guaranteeing stable system operation.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a flue gas desulfurization particulate matter purification system provided in an exemplary embodiment of this disclosure; Figure 2 This is a top view of the separator and purifier in a flue gas desulfurization particulate matter purification system provided in an exemplary embodiment of this disclosure; Figure 3 This is a top view of a chimney wall condensate collection device in a flue gas desulfurization particulate matter purification system provided by an exemplary embodiment of this disclosure; Figure 4 This is a schematic diagram of the honeycomb structure blade in a flue gas desulfurization particulate matter purification system provided by an exemplary embodiment of the present disclosure; Figure 5 yes Figure 4 Enlarged view of point A in the middle; Figure 6This is a block diagram of a control unit in a flue gas desulfurization particulate matter purification system provided in an exemplary embodiment of this disclosure.

[0019] Explanation of reference numerals in the attached figures 10-Desulfurization tower; 20-Chimney; 30-Condensate collection tank; 100-Purification device; 110-Separator purifier; 111-Honeycomb structure blades; 112-Gas passage; 113-First baffle; 114-Second baffle; 115-Distribution hole; 116-Screw; 117-Nut; 118-Pressure plate; 120-First sealing plate; 130-Second sealing plate; 140-Support frame; 200-Flushing spray device; 210-Spray pipe; 220-Nozzle; 300-Mixed liquid collection device; 310-Mixed liquid collection tank; 311-Water baffle; 320-First downcomer pipe; 400-Chimney wall condensate collection device; 410-Condensate collection tank; 420-Second downcomer pipe; 500-Control unit; 510-Controller; 520-Pressure detection element. Detailed Implementation

[0020] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0021] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally defined according to the actual operating conditions of the desulfurization tower. Specifically, upper, lower, top, and bottom can be referred to as... Figure 1 The drawing orientation is shown; "inner" and "outer" refer to the outline of the corresponding component itself. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0022] This disclosure provides an exemplary embodiment of a flue gas desulfurization particulate matter purification system for purifying particulate matter in flue gas after desulfurization by desulfurization tower 10. Specifically, after the flue gas completes the desulfurization process inside desulfurization tower 10, it needs to be treated by the flue gas desulfurization particulate matter purification system provided in this disclosure before being discharged outwards from the top flue. (Refer to...) Figure 1 ( Figure 1 The middle arrow indicates the direction of flue gas flow. The flue gas desulfurization particulate matter purification system may include a purification device 100, a flushing spray device 200, a mixed liquid collection device 300, a chimney wall condensate collection device 400, and a control unit 500.

[0023] Purification device 100, as the core of the purification system, mainly purifies the desulfurized flue gas to remove particulate matter carried in it. (Refer to...) Figure 1 The purification device 100 may include a separation purifier 110 installed at the flue outlet at the top of the desulfurization tower 10. For example, it may be arranged between the flue outlet of the desulfurization tower 10 and the ridge-type demister inside the desulfurization tower 10. One or more separation purifiers 110 may be installed according to the particulate matter concentration control requirements at the outlet of the desulfurization tower 10. (Refer to...) Figure 4 ( Figure 4 The middle arrow indicates the direction of flue gas flow. Figure 5 ( Figure 5 (The solid arrows indicate the flow direction of flue gas, and the hollow arrows indicate the flow direction of water.) The separator purifier 110 has honeycomb-structured blades 111 capable of capturing particulate matter in the flowing flue gas. The honeycomb-structured blades 111 employ specific geometric parameters, which have the functions of turbulence and liquid aggregation. They can change the direction of the incoming flue gas flow field, thereby enhancing droplet collision, causing droplets to be adsorbed and aggregated on the blades. Thus, gas-liquid separation is achieved as the flue gas flows through the honeycomb-structured blades 111, with particulate matter encapsulated in the droplets. Ultimately, this achieves efficient removal of particulate matter of 8μm and below, meeting the ultra-low emission requirement of ≤5mg / Nm³ for outlet particulate matter.

[0024] Reference Figure 1 The flushing spray device 200 can be installed above the separator 110 to flush the honeycomb structure blades 111 and remove scale from the blade surface. The mixed liquid collection device 300 can be installed below the separator 110 and directly opposite the honeycomb structure blades 111 to collect the separated mixed liquid containing particulate matter aggregated on the honeycomb structure blades 111. The chimney wall condensate collection device 400 can be installed at the inlet of the top chimney 20 of the desulfurization tower 10 to collect the condensate generated by the flue gas flowing through the chimney 20 and exchanging heat with the chimney wall. The control unit 500 can be signal-connected to both the separator 110 and the flushing spray device 200 to control the flushing spray device 200 to open or close by receiving signals from the separator 110. When the flushing spray device 200 is open, it flushes the honeycomb structure blades 111, and the droplets aggregated on the blades can flow into the mixed liquid collection device 300 below under the action of the flushing water.

[0025] Through the above technical solution, the desulfurized flue gas enters the separator purifier 110. Under the forced flow guidance of the honeycomb structure blades 111, the flow field changes direction, generating centrifugal force. Liquid droplets in the flue gas collide with the honeycomb structure blades 111 under the action of centrifugal force, forming a liquid film. The liquid film coalesces and flows into the mixed liquid collection device 300 below under the action of gravity, thereby achieving gas-liquid separation. Most of the particles of 8μm and below in the flue gas are captured and finally discharged through the outlet flue. At the same time, the condensate generated by the heat exchange between the flue gas and the chimney wall during the flow flows along the tower wall to the chimney wall condensate collection device 400, which works with the mixed liquid collection device 300 to complete gas-liquid separation and particle collection. In addition, the control unit 500 monitors the status of the separator purifier 110 in real time and controls the flushing spray device 200 to flush the honeycomb structure blades 111 in a timely and appropriate manner, maintaining a dynamic balance between the cleanliness of the honeycomb structure blades 111 and the separation efficiency. Throughout the process, the purification device 100, the flushing spray device 200, the mixed liquor collection device 300, the chimney wall condensate collection device 400, and the control unit 500 operate in concert, ensuring the system maintains stable purification performance within an operational flexibility range of 30%-110%. The residence time of the flue gas in the separator purifier 110 is 35.2-77.44 minutes, ensuring deep purification. The purification device 100, the flushing spray device 200, the mixed liquor collection device 300, the chimney wall condensate collection device 400, and the control unit 500 form an integrated deep purification system through parameter matching, ensuring the overall pressure drop remains stable at 0.19-0.94 kPa, achieving synergistic efficiency across all components and guaranteeing stable system operation.

[0026] In the embodiments provided in this disclosure, the honeycomb structure blades 111 can be constructed from a plate-shaped structure, such as a thin plate, and a honeycomb structure is formed by opening gas channels 112 inside the plate-shaped structure. Specifically, refer to... Figure 4 and Figure 5 The main body of the honeycomb structure is a regular hexagon. Gas channels 112 are formed around each side of the hexagon, creating a gas channel 112 between every two adjacent hexagons. These gas channels 112 are interconnected and continuous, allowing the incoming flue gas to flow outwards through multiple channels. The gas channels 112 can be arranged parallel to the sides of the hexagons, and the sides of the hexagons can form part of the sidewalls of the gas channels 112 to ensure that the flue gas can collide with the honeycomb structure. For example, the gas channels 112 can be rectangular channels. Figure 4 In the illustrated structure, the gas channel 112 can extend continuously in all directions of the plate-shaped structure, so that the honeycomb structure covers the entire blade plane. The gas channel 112 can communicate with two opposite surfaces in the width direction of the plate-shaped structure to facilitate the smooth introduction and exit of flue gas. It should be noted that, referring to... Figure 5In this embodiment, the regular hexagon of the honeycomb structure blade 111 is a solid structure. As the flue gas flows through the gas channel 112 inside the blade, it continuously collides with the edges of the regular hexagons, thereby changing the flow direction and causing droplets in the flue gas to be adsorbed and coalesced on the corresponding edges, achieving the aforementioned gas-liquid separation. This disclosure does not limit the specific structure and material of the honeycomb structure blade 111; it can be set according to actual needs. For example, the honeycomb structure blade 111 can be designed as a rectangular plate with a height of 2000-2500 mm, a width of 1800-2000 mm, a thickness of 6-8 mm, and a cross-sectional dimension of the gas channel 112 (the distance between two adjacent regular hexagons) of 2-4 mm. The material can be 316L stainless steel or 2205 double-sided stainless steel, etc., to meet the structural strength and corrosion resistance requirements of the honeycomb structure blade 111, ensuring droplet collision and coalescence effects and separation efficiency at high gas velocities.

[0027] Furthermore, the honeycomb structure blade 111 can be provided with a guide channel that extends to the mixture collection device 300, so that the droplets aggregated on the blade can flow smoothly along the guide channel to the mixture collection device 300. In one embodiment, the gas channel 112 can be constructed as a guide channel, simply by connecting the gas channel 112 to the lower surface of the honeycomb structure blade 111.

[0028] According to the embodiments provided in this disclosure, refer to Figure 1 The separator 110 can be constructed as a vertically arranged cylindrical structure. The sidewalls of the cylindrical structure are composed of honeycomb-shaped blades 111. A first sealing plate 120 is provided at the bottom of the cylindrical structure, and a second sealing plate 130 is provided between the top edge of the cylindrical structure and the inner wall of the desulfurization tower 10. By setting the first sealing plate 120 and the second sealing plate 130, it can be ensured that when the flue gas flows from bottom to top, it can completely enter the honeycomb-shaped blades 111 from the outer sidewall of the cylindrical structure, and then flow outward from the inner sidewall of the cylindrical structure after gas-liquid separation, and finally be discharged through the outlet flue, thus fully ensuring the separation efficiency when the flue gas enters. The first sealing plate 120 and the second sealing plate 130 can be stainless steel sealing plates, with strength sufficient to meet the requirements of flue gas impact and scaffolding erection. In one embodiment, as described above, when the particulate matter concentration at the outlet of the desulfurization tower 10 is less than 5 mg / Nm³, two separation purifiers 110 can be arranged at intervals in the vertical direction; when the particulate matter concentration at the outlet of the desulfurization tower 10 is less than 10 mg / Nm³, one separation purifier 110 can be arranged in the vertical direction. The height of each separation purifier 110 can be 2-2.5 m.

[0029] Furthermore, referring to Figure 2The separator / purifier 110 can be a polyhedral cylindrical structure. Each sidewall of the polyhedral cylindrical structure can be constructed from multiple honeycomb-shaped blades 111. For example, the multiple honeycomb-shaped blades 111 can be stacked and continuously arranged. Each sidewall of the polyhedral cylindrical structure can be evenly distributed in a circumferential array; that is, the separator / purifier 110 can be constructed as a regular polyhedral cylindrical structure. Figure 2 The diagram shows a regular octahedral cylindrical structure. This divides the flue gas into multiple independent flow zones, allowing it to enter the separator / purifier 110 more evenly and ensuring consistent purification across all parts of the separator / purifier 110.

[0030] In the embodiments provided in this disclosure, reference is made to Figure 4 A first baffle 113 can be provided on the flue gas inlet side of the honeycomb structure blade 111, and a second baffle 114 can be provided on the flue gas outlet side accordingly. The first baffle 113 and the second baffle 114 are respectively fixedly connected to the honeycomb structure blade 111. For example, in Figure 4 In the illustrated embodiment, the first baffle 113 and the second baffle 114 can be fixedly connected to the honeycomb structure blades 111 by fasteners such as screws 116 and nuts 117. One end of the screw 116 passes through the baffle and is welded to the honeycomb structure blades 111, while the other end is threadedly engaged with the nut 117 via a pressure plate 118. The first baffle 113 and the second baffle 114 are each provided with multiple distribution holes 115 for flue gas to enter and exit, and these holes can be evenly distributed. On one hand, the first baffle 113, the second baffle 114, and the honeycomb structure blades 111 can together form a combined unit, enabling the modular design of the separator purifier 110. Each blade combination unit structure can be independently replaced to adapt to desulfurization systems of different scales. On the other hand, the first baffle 113 and the second baffle 114 can also serve to turbulentize the flue gas. That is, referring to… Figure 1 The flue gas flows vertically upward inside the desulfurization tower 10. After encountering the first baffle 113, the flow direction changes by nearly 90° and enters the distribution hole 115 of the first baffle 113 in a roughly horizontal direction. Then it enters the honeycomb structure blades 111 and continuously collides with the blades as it flows along the internal gas channel 112. The flow direction changes multiple times. Finally, when it flows out through the distribution hole 115 on the second baffle 114, the flow direction changes by nearly 90° again, changing from a roughly horizontal direction to a vertical direction and then flowing upward toward the flue outlet.

[0031] Therefore, the separation and purification device 110 provided in this embodiment has a high gas velocity capture mechanism, which is adapted to the gas phase flow rate of 2.8-4.87 m / s in an empty tower. When the flue gas enters the separation and purification device 110 at a certain flow rate (e.g., 2.8-4.87 m / s), the centrifugal force generated by multiple flow field turns enhances the droplet collision. Compared with traditional equipment, the droplet collision and coalescence efficiency is improved by more than 40%. Combined with the ≥2mm liquid film coalescence and forced mixing and washing effect, most of the particles of 8μm and below are captured, solving the problem of the reduction in separation and capture efficiency under high gas velocity conditions in traditional equipment. Moreover, the container space meets the on-site installation requirements of the internal components.

[0032] Additionally, refer to Figure 1 The purification device 100 provided in this embodiment may further include a support frame 140, which is fixedly connected to the tower wall of the desulfurization tower 10. The separator 110 can be fixedly installed on the support frame 140. The support frame 140 is made of steel and can be fully welded to the tower wall. Its load-bearing strength meets the weight requirements of the separator 110 and the scaffolding erection requirements. Its frame structure ensures that the flue gas can pass through smoothly. The separator 110 and the support frame 140 can be connected by flange or threaded fixing, which is convenient for disassembly, maintenance and flushing. They can also be connected by clamps, which can achieve stable installation of the separator 110 (load-bearing strength ≥600kg / m²) and ensure that the flue gas flows smoothly at a flow rate of 2.8-4.87m / s.

[0033] According to the embodiments provided in this disclosure, refer to Figure 2 The rinsing spray device 200 may include a spray pipe 210 and a plurality of nozzles 220 mounted on the spray pipe 210. The spray pipe 210 is located above and surrounds the separator 110. For example, in an embodiment where the separator 110 has a cylindrical structure, the spray pipe 210 may be arranged in a horizontal annular pattern. The nozzles 220 are inclined downwards and toward the honeycomb structure blades 111. For example, the nozzles 220 may be installed at a downward angle of 45° to achieve sufficient coverage for rinsing. The plurality of nozzles 220 may be evenly distributed circumferentially on the spray pipe 210. The nozzles 220 may be fan-shaped nozzles or spiral nozzles, both of which can achieve 300% rinsing coverage to ensure the cleanliness of the honeycomb structure blades 111.

[0034] The rinsing spray device 200 may also include a variable frequency rinsing pump and a flow sensor, which are respectively signal-connected to the controller 510 of the control unit 500. The variable frequency rinsing pump can be connected to the spray pipe 210 and the water washing tank, so that the rinsing water from the water washing tank is sprayed out through the spray pipe 210 and the nozzle 220 at a preset pressure (e.g., 0.4 MPa). The flow sensor can adjust the water volume in real time to ensure that the rinsing coverage reaches 300% and that no excessive water accumulation occurs. The variable frequency rinsing pump can also be replaced by a pneumatic diaphragm pump, both of which can achieve flow regulation in the range of 30-50Hz, meet the 0.4 MPa outlet pressure requirement, and ensure the cleanliness of the honeycomb structure blades 111.

[0035] According to the embodiments provided in this disclosure, refer to Figure 6 The control unit 500 may include a controller 510 and a pressure sensor 520. The controller 510 is signal-connected to both the rinsing spray device 200 (the aforementioned variable frequency rinsing pump) and the pressure sensor 520, respectively, to control the variable frequency rinsing pump of the rinsing spray device 200 to turn on or off by receiving signals from the pressure sensor 520. (Refer to...) Figure 1 The pressure detection element 510 can be installed in the flue gas inlet duct and flue gas outlet duct of the separator purifier 110 to detect the pressure difference between the flue gas inlet and outlet of the separator purifier 110. Specifically, when the pressure difference between the flue gas inlet and outlet of the separator purifier 110 is greater than or equal to a first preset value, the controller 510 controls the flushing spray device 200 to open; when the pressure difference between the flue gas inlet and outlet of the separator purifier 110 is less than or equal to a second preset value, the controller 510 controls the flushing spray device 200 to close. In this way, the pressure detection element 520 can monitor the pressure difference between the flue gas inlet and outlet of the separator purifier 110 in real time. When scale forms on the surface of the honeycomb structure blades 111, it increases resistance, which in turn increases the pressure difference between the flue gas inlet and outlet. At this time, the pressure detection element 520 sends a signal to the controller 510, and the controller 510 accordingly controls the flushing spray device 200 to flush the honeycomb structure blades 111, thereby removing scale from the surface of the honeycomb structure blades 111 in real time and ensuring a dynamic balance between the cleanliness of the honeycomb structure blades 111 and the flushing effect. The control unit 500 can also be designed with a monitoring touch screen to intuitively display the monitored information and facilitate operation by staff.

[0036] In one implementation, the pressure sensing element 520 can be a differential pressure transmitter. The positive pressure port of the differential pressure transmitter can be connected to the inlet flue of the separator purifier 110, and the negative pressure port can be connected to the outlet flue of the separator purifier 110. The signal can be connected to the controller 510. The first preset value (150 Pa as described below) and the second preset value (80 Pa as described below) can be set according to actual needs. In another implementation, the pressure sensing element 520 can also be a capacitive differential pressure transmitter. Both capacitive differential pressure transmitters and the differential pressure transmitters described above can accurately monitor the pressure difference between the inlet and outlet of the flue gas of the separator purifier 110 within the range of 0-500 Pa, providing accurate signals for the flushing spray device 200.

[0037] Therefore, the flue gas desulfurization particulate matter purification system provided in this embodiment has an intelligent flushing control function. It optimizes the design of the flushing spray structure and nozzle parameters, and constructs a closed-loop control logic based on the pressure difference between the flue gas inlet and outlet of the separator 110. When the pressure difference is ≥150Pa, flushing is started with a 30Hz frequency and a pressure of 0.4MPa. It continues for 180 seconds and stops when the pressure difference is ≤80Pa. The flow sensor dynamically adjusts the water volume to ensure a balance between the cleanliness of the honeycomb structure blades 111 and the flushing effect, and maintains the internal pressure drop stable at 0.12-0.16KPa.

[0038] According to the embodiments provided in this disclosure, refer to Figure 1 The mixed liquid collection device 300 may include a mixed liquid collection tank 310 and a first downcomer pipe 320. The mixed liquid collection tank 310 is located below the separator / purifier 110 and directly opposite the honeycomb-shaped blades 111. In embodiments where the separator / purifier 110 has a cylindrical structure, the mixed liquid collection tank 310 can be arranged around the honeycomb-shaped blades 111, with a certain distance between it and the bottom of the separator / purifier 110, and its capacity meets the requirements for liquid recovery. The mixed liquid collection tank 310 can be constructed as a rectangular tank structure with a closed bottom and side walls and an open top. Referring to... Figure 4A water-retaining flange 311 can be installed at the top of the mixed liquid collection tank 310. The water-retaining flange 311 extends downwards and inwards from the top edge of the mixed liquid collection tank 310 to prevent secondary entrainment of the separated mixed liquid by flue gas. The mixed liquid collection tank 310 can be made of corrosion-resistant stainless steel or fiberglass, both suitable for a volume design of 5-10m³, and the 12-15mm wide water-retaining flange 311 prevents secondary entrainment of flue gas. The first downcomer pipe 320 can be connected to the mixed liquid collection tank 310 and the condensate collection tank 30 outside the desulfurization tower 10. The condensate collection tank 30 is located outside the tower and can be designed independently or utilize the external water washing tank. The first downcomer pipe 320 can be made of stainless steel or high-temperature resistant fiberglass. One end is connected to the bottom of the mixed liquid collection tank 310, and the other end extends from inside the tower through the tower wall to the outside of the tower. Most pipes are located outside the tower, and the external pipes can be designed with heat tracing and insulation. Heat tracing and insulation can be achieved using electric or steam tracing methods, both of which can maintain an anti-crystallization temperature of 50-60℃. Additionally, external pipelines can be equipped with emergency shut-off devices such as manual shut-off valves and electric regulating valves, as well as sampling pipelines, valves, and metering devices.

[0039] Furthermore, referring to Figure 1 One end of the first downcomer pipe 320 connected to the condensate collection tank 30 can be completely submerged below the lowest liquid level of the condensate collection tank 30 to form a reliable liquid seal and prevent flue gas from backflowing.

[0040] According to the embodiments provided in this disclosure, refer to Figure 1 and Figure 3 The chimney wall condensate collection device 400 may include a chimney wall condensate collection tank 410 and a second downcomer pipe 420. The chimney wall condensate collection tank 410 can be fixedly installed at the inlet of the chimney 20 at the top of the desulfurization tower 10 and arranged around the inner wall of the chimney 20, with a capacity sufficient to collect chimney wall condensate. The chimney wall condensate collection tank 410 can be constructed as a semi-enclosed box-type structure, with its bottom wall and side walls fully welded perpendicularly to the chimney wall. The chimney wall condensate collection tank 410 can also be made of 316L stainless steel or fiberglass. The second downcomer pipe 420 can connect the chimney wall condensate collection tank 410 and the aforementioned condensate receiving tank 30 outside the desulfurization tower 10. The second downcomer pipe 420 can be welded to the bottom wall of the chimney wall condensate receiving tank 410. The second downcomer pipe 420 can be made of stainless steel or high-temperature resistant fiberglass. One end connects to the bottom of the condensate collection tank 410 on the chimney wall, and the other end extends from inside the tower through the tower wall to the outside. Most of the pipes are located outside the tower, and these external pipes can be designed with heat tracing and insulation. Heat tracing and insulation can be achieved using electric heat tracing or steam heat tracing, both of which can maintain an anti-crystallization temperature of 50-60℃. In addition, manual shut-off valves, electric regulating valves, and other emergency shut-off devices, as well as sampling pipes, valves, and metering devices can be installed on the external pipes.

[0041] Furthermore, referring to Figure 1 The end of the second downcomer pipe 420 connected to the condensate collection tank 30 can also be completely submerged below the lowest liquid level of the condensate collection tank 30 to form a reliable liquid seal and prevent flue gas backflow.

[0042] Therefore, the mixed liquid collection device 300 provided in this embodiment of the present disclosure works in conjunction with the chimney wall condensate collection device 400, and with the independent downcomer pipe, the external condensate receiving tank 30 and the standard liquid seal depth of 100-150mm, it can effectively prevent secondary entrainment of condensate, backflow of flue gas and crystallization blockage, and ensure smooth discharge of the mixed liquid carrying particulate matter.

[0043] The use of the flue gas desulfurization particulate matter purification system is further illustrated below with a specific embodiment.

[0044] Coal-to-oil company 2 This solution was applied to the retrofitting of the ammonia desulfurization system of three 440t / h circulating fluidized bed boilers in a 100MW unit. The original desulfurization tower outlet particulate matter concentration of this system was less than 30mg / Nm³, which could not meet the ultra-low emission requirements. During the renovation, a separator / purifier 110 was installed 4.8m from the top of the original ridge-type demister at the flue outlet of the desulfurization tower (two were arranged according to design requirements, as the outlet particulate matter concentration was no more than 5mg / Nm³). Each set of honeycomb-structured blades 111 had a thickness of 7mm, a height of 2200mm, a width of 2000mm, and a spacing of 3mm (all within the parameter ranges of 6-8mm, 2000-2500mm, 1800-2000mm, and 2-4mm, respectively). A steel support frame 140 was fully welded to the tower wall, and the honeycomb-structured blades 111 were bolted to the support frame 140, achieving a load-bearing strength of 600kg / m². A 316L stainless steel mixed liquid collection tank 310 with a volume of 8m³ was installed 500mm below each separator / purifier 110 (meeting the requirements of 5-10m³). (Volume standard), the upper water baffle of the tank is 311 and 12mm wide (within the range of 12-15mm), and the matching external pipeline heat tracing and insulation device maintains the temperature at 50-60℃.

[0045] The spray pipe 210 of the flushing spray device 200 is arranged at the top 2200mm of the separator purifier 110, and is equipped with 12 stainless steel fan-shaped nozzles 220 (installed at a downward angle of 45°), which are connected to a variable frequency flushing pump with a head of 35m (the outlet pressure can be stabilized at 0.4MPa); the pressure detection element 520 is a differential pressure transmitter with a measurement range of 0-500Pa, and one is installed at the bottom and top flue of the separator purifier 110. The controller 510 is linked with the monitoring touch screen to realize automatic control, and can monitor the internal pressure drop and the overall pressure drop in real time.

[0046] After the purification system is in operation, under boiler load fluctuations of 30%-110% (matching the system's 30%-110% operational flexibility), and a flue gas velocity of 3.56 m / s (within the design range of 2.8-4.87 m / s), the pressure difference between the flue gas inlet and outlet of the separator 110 stabilizes at 80-150 Pa, the internal pressure drop is maintained at 0.12-0.16 kPa, and the overall pressure drop is controlled at 0.19-0.94 kPa. When the pressure difference reaches 150 Pa, the flushing spray device 200 is activated, and the variable frequency flushing pump operating at 30 Hz sprays flushing water at a pressure of 0.4 MPa through the fan-shaped nozzle 220. After 180 seconds, the pressure difference drops below 80 Pa, and the cleanliness of the honeycomb structure blades 111 remains good. Testing showed that the average particulate matter concentration at the desulfurization tower outlet stabilized at 3-5 mg / Nm³ after the upgrade, with a removal rate of over 98% for particles of 8 μm and below, meeting ultra-low emission standards. The equipment operated continuously for 180 days without clogging (verifying the effectiveness of the anti-crystallization clogging design), saving 520,000 yuan in annual maintenance costs and 12,000 tons of water, consistent with the project's expected energy reduction and environmental benefits.

[0047] In summary, the flue gas desulfurization particulate matter purification system provided by the embodiments of this disclosure has the following advantages: I. Significantly Improved Purification Efficiency: The separator purifier 110 uses a honeycomb structure blade 111 with multiple flow field turning designs to capture most of the particles of 8μm and below. Combined with the precise liquid curtain washing of the fan-shaped nozzle 220 (300% coverage), the particulate matter emission concentration is stably controlled below 5mg / Nm³, which is more than 75% lower than the traditional technology (20-30mg / Nm³), meeting all ultra-low emission indicators. II. Enhanced Operational Stability and Durability: The control unit 500, through differential pressure linkage flushing logic (start at 150Pa, stop at 80Pa), can remove scale from the surface of the honeycomb structure blades 111 in real time, stabilizing the pressure drop of the internal components at 0.12-0.16KPa and maintaining the overall pressure drop at 0.19-0.94KPa, avoiding the sudden increase in resistance (often exceeding 300Pa) caused by blockage in traditional demisters; the 100-150mm liquid seal design of the downcomer completely eliminates flue gas backflow, and the heat tracing and insulation structure of the external pipeline of the condensate tower (maintaining a temperature of 50-60℃) prevents slurry crystallization and blockage, extending the continuous operation cycle of the equipment to more than 180 days, double that of the existing technology (90 days), and adapting to the operating requirements of 16%-80% internal load; III. Reduced Energy Consumption and Maintenance Costs: The variable frequency flushing pump (30-50Hz adjustable) dynamically adjusts its power according to operating conditions, saving 30% more electricity than a fixed flow design; the fan-shaped flushing nozzle 220 (45° downward spray) precisely cleans the honeycomb structure blades 111, reducing flushing water volume by 40% and avoiding secondary entrainment; the fan-shaped nozzle 220 has improved anti-clogging capabilities, reducing spare parts replacement frequency by 60%. Combined with the extended continuous operation cycle of the equipment, the annual maintenance cost is reduced by approximately RMB 520,000 per unit, consistent with data from actual application cases. IV. Outstanding Environmental and Safety Benefits: Particulate matter concentration is reduced from 30-35 mgN / m³ to below 5 mgN / m³, completely eliminating the risk of acid rain corrosion and reducing the corrosion rate of surrounding equipment by 80%; the fully sealed system design (first sealing plate 120 and second sealing plate 130) reduces ammonia leakage, and the ammonia concentration in the working environment is ≤10ppm, which meets occupational health standards (≤25ppm); at the same time, the condensate is recycled and reused (returned to the absorption section) to reduce wastewater discharge, saving 12,000 tons of water per year, achieving the dual benefits of environmental protection and resource conservation; V. Excellent adaptability and scalability: The purification system can adapt to boiler load fluctuations of 30%-110% and maintain high-efficiency purification within a flue gas velocity range of 2.8-4.87m / s; the modular design of the 110 separator (each honeycomb structure blade 111 can be replaced independently and is fixed to the steel support frame 140 with connecting bolts) facilitates the retrofitting of existing desulfurization towers without the need to replace the entire tower body, shortening the retrofitting cycle to less than 30 days, saving 67% of the construction period compared to the traditional diameter expansion retrofit (90 days); the container space meets the on-site installation requirements of internal components and is compatible with desulfurization systems of different scales.

[0048] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0050] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A flue gas desulfurization particulate matter purification system, used to purify particulate matter in flue gas after desulfurization in a desulfurization tower, characterized in that, The flue gas desulfurization particulate matter purification system includes: The purification device includes a separation purifier installed at the flue outlet at the top of the desulfurization tower. The separation purifier has honeycomb-shaped blades capable of capturing particulate matter in the through-flow flue gas to achieve gas-liquid separation. A rinsing spray device is installed above the separator and purifier to rinse the honeycomb structure blades; A mixture collection device is installed below the separator and purifier to collect the separated mixture containing particulate matter. A condensate collection device is installed at the top of the desulfurization tower at the chimney inlet to collect the condensate generated during the heat exchange between the flue gas and the chimney wall as the flue gas flows through; and The control unit is connected to both the separator and the rinsing spray device via signal connection, and controls the rinsing spray device to turn on or off by receiving signals from the separator.

2. The flue gas desulfurization particulate matter purification system according to claim 1, characterized in that, The honeycomb structure blades are constructed as plate-shaped structures, and gas channels are opened inside the plate-shaped structures to form a honeycomb structure.

3. The flue gas desulfurization particulate matter purification system according to claim 2, characterized in that, The honeycomb-shaped blade has a first baffle on the flue gas inlet side and a second baffle on the flue gas outlet side. The first baffle and the second baffle are respectively provided with multiple distribution holes for flue gas to enter and exit, and the first baffle and the second baffle are respectively fixedly connected to the honeycomb-shaped blade.

4. The flue gas desulfurization particulate matter purification system according to claim 1, characterized in that, The separator and purifier is constructed as a vertically arranged cylindrical structure. The sidewalls of the cylindrical structure are made of honeycomb-shaped blades. A first sealing plate is provided at the bottom of the cylindrical structure, and a second sealing plate is provided between the top edge of the cylindrical structure and the inner wall of the desulfurization tower.

5. The flue gas desulfurization particulate matter purification system according to claim 4, characterized in that, The cylindrical structure is a polyhedral cylindrical structure, and each sidewall of the polyhedral cylindrical structure is constructed from multiple honeycomb-shaped blades, and each sidewall of the polyhedral cylindrical structure is evenly distributed in a circumferential array.

6. The flue gas desulfurization particulate matter purification system according to claim 1, characterized in that, The purification device also includes a support frame, which is fixedly connected to the tower wall of the desulfurization tower, and the separation purifier is fixedly installed on the support frame.

7. The flue gas desulfurization particulate matter purification system according to any one of claims 1-6, characterized in that, The rinsing spray device includes a spray pipe and a plurality of nozzles installed on the spray pipe. The spray pipe is located above and around the separator and purifier. The nozzles are tilted downward and toward the honeycomb structure blades.

8. The flue gas desulfurization particulate matter purification system according to any one of claims 1-6, characterized in that, The mixed liquid collection device includes a mixed liquid collection tank and a first downcomer pipe. The mixed liquid collection tank is located below the separator and purifier and directly opposite the honeycomb structure blades. The first downcomer pipe is connected to the mixed liquid collection tank and the condensate collection tank outside the desulfurization tower. The top of the mixed liquid collection tank is provided with a water baffle.

9. The flue gas desulfurization particulate matter purification system according to any one of claims 1-6, characterized in that, The chimney wall condensate collection device includes a chimney wall condensate collection tank and a second downcomer. The chimney wall condensate collection tank is fixedly installed at the chimney inlet at the top of the desulfurization tower and is arranged around the inner wall of the chimney. The second downcomer connects the chimney wall condensate collection tank and a condensate collection tank outside the desulfurization tower.

10. The flue gas desulfurization particulate matter purification system according to any one of claims 1-6, characterized in that, The control unit includes a controller and a pressure detection element. The controller is signal-connected to both the flushing spray device and the pressure detection element. The pressure detection element is installed at both the flue gas inlet and outlet ducts of the separator / purifier to detect the pressure difference between the flue gas inlet and outlet of the separator / purifier. When the pressure difference between the flue gas inlet and outlet of the separator is greater than or equal to a first preset value, the controller controls the flushing spray device to turn on. When the pressure difference between the flue gas inlet and outlet of the separator is less than or equal to the second preset value, the controller controls the flushing spray device to shut down.

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