A dual-tower desulfurization system and method based on flue gas reforming and slurry staged supply.

Abstract

This invention relates to a dual-tower desulfurization system and method based on flue gas reforming and staged slurry supply. The system includes a primary absorption tower, an inter-tower flue gas reforming unit, and a secondary absorption tower, sequentially connected along the flue gas flow direction. The inter-tower flue gas reforming unit is located between the outlet of the primary absorption tower and the inlet of the secondary absorption tower, and is used to reform the flue gas from the primary absorption tower. The inter-tower flue gas reforming unit includes a horizontally arranged flue gas reforming chamber, a flow stabilizing and guiding component, a flow deviation correction component, and a slurry removal component installed inside the flue gas reforming chamber and sequentially arranged along the flue gas flow direction; and a primary spray mechanism and a secondary spray mechanism provide staged slurry supply. This invention achieves a synergistic leap in system energy efficiency and desulfurization performance by coupling the functional gradation of the primary and secondary absorption towers with the active reforming of the inter-tower flue gas.

Description

Technical Field

[0001] This invention relates to the field of wet flue gas desulfurization technology, and in particular to a dual-tower desulfurization system and method based on flue gas reforming and slurry staged supply. Background Technology

[0002] In the ultra-low emission retrofitting of coal-fired power plants, wet desulfurization processes using two-stage absorption towers in series (i.e., dual towers) have been widely applied. However, the current mainstream dual-tower systems have fundamental limitations in their design and operation concepts, which restricts further improvements in their energy efficiency and performance.

[0003] In existing technologies, dual towers are typically only physically connected in series. The two absorption towers are similar in structure and operating parameters, both undertaking similar desulfurization tasks. This "homogeneous series connection" mode prevents the system from being adaptively designed based on the inherent law of drastic changes in flue gas concentration from high to low during desulfurization. The first absorption tower, handling the front-end treatment, requires a larger spray volume ("coarse desulfurization" mode) to rapidly reduce the high concentration of sulfur dioxide in the flue gas due to its heaviest desulfurization load. Meanwhile, the second absorption tower, located at the rear end, should switch to a "fine desulfurization" mode characterized by high efficiency and low energy consumption, since the inlet flue gas concentration has already been significantly reduced.

[0004] The first absorber tower operates in a "coarse desulfurization" mode to handle high-concentration flue gas. While this ensures the main desulfurization efficiency, it also easily deteriorates the flue gas condition at the tower's outlet. High-speed spraying and intense turbulence cause uneven distribution of the flue gas flow field, resulting in localized flow deviations and entrainment of a large number of droplets, leading to a high droplet content at the outlet. If this turbulent flue gas enters the second absorber tower directly without any treatment, it will severely disrupt the ideal inlet conditions required for stable and efficient "fine desulfurization" in the second absorber tower. This will reduce its spray coverage efficiency, worsen localized mass transfer, and ultimately affect the overall system's desulfurization efficiency limit and operational stability.

[0005] Therefore, there is an urgent need for an innovative solution that can implement clear functional classification based on flue gas concentration, effectively solve the side effects of the "coarse degassing" in the front stage, create stable conditions for the "fine degassing" in the back stage, and thus achieve simultaneous optimization of system energy efficiency and performance. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a dual-tower desulfurization system and method based on flue gas reforming and slurry staged supply. This invention breaks away from the traditional homogeneous series connection mode of dual towers, achieving a synergistic leap in system energy efficiency and desulfurization performance through the functional grading of the primary and secondary absorption towers and the coupling of active flue gas reforming between the towers.

[0007] In a first aspect, the present invention provides a dual-tower desulfurization system based on flue gas reforming and slurry staged supply, comprising a primary absorption tower, an inter-tower flue gas reforming unit, and a secondary absorption tower connected sequentially along the flue gas flow direction.

[0008] The inter-tower flue gas reforming unit is located between the outlet of the primary absorption tower and the inlet of the secondary absorption tower, and is used to reform the flue gas from the primary absorption tower. The inter-tower flue gas reforming unit includes a horizontally arranged flue gas reforming box, a flow stabilizing guide component, a flow deviation correction component, and a liquid removal component installed in the flue gas reforming box and arranged sequentially along the flue gas flow direction.

[0009] The primary absorption tower is equipped with a primary spraying mechanism and a primary demisting mechanism from bottom to top. The secondary absorption tower is equipped with a secondary spraying mechanism, a coalescence strengthening component, and a secondary demisting mechanism from bottom to top. The primary and secondary spraying mechanisms provide liquid in stages.

[0010] Preferably, the flow stabilizing guide component includes a grid-type guide plate and a porous guide plate that are sequentially fixed inside the flue gas reforming box along the flue gas direction.

[0011] Preferably, the grid-type guide vane is formed by vertically fixing a set of parallel longitudinal grid bars and a set of parallel transverse grid bars to create a uniform grid channel. The grid-type guide vane mainly functions to initially divide the airflow and disperse large vortices. The porous guide vane is a circular plate with several evenly distributed through holes. In this embodiment, three porous guide vanes are arranged in parallel. The porous guide vanes then perform secondary distribution and homogenization of the airflow, making the velocity distribution of the airflow exiting the component more uniform.

[0012] Preferably, the deflection correction component includes a circular outer frame fixed to the inner wall of the flue gas reforming box, and a crossbeam and a longitudinal beam fixed to the circular outer frame. The crossbeam and the longitudinal beam divide the area inside the circular outer frame into several independent adjustment zones. Each adjustment zone is equipped with several blades that can swing at an angle, and the blades have a louvered structure.

[0013] Preferably, the crossbeams and longitudinal beams are arranged in pairs, arranged in a "well" shape and fixedly connected, dividing the area within the circular frame into nine independent adjustment zones. The blades in each adjustment zone are hinged together via a pivot, connected by an independent connecting rod, and driven by an independent electric or pneumatic actuator. This allows for independent control of the blade opening angle within each zone. By adjusting the opening angle of the blades in different adjustment zones, the flow area of ​​that zone can be locally altered, thereby specifically correcting the uneven distribution of velocity and concentration on the flue gas cross-section, achieving field equilibrium of flow rate and concentration, and correcting flow deviation.

[0014] Preferably, the dewatering component includes at least one baffle assembly consisting of multiple parallel baffle blades. The baffle blades include alternating forward bending portions and reverse bending portions arranged along the flue gas flow direction to form a continuous double S-shaped corrugated structure. A drain hole is provided at the bottom of the flue gas reforming box corresponding to the position directly below the dewatering component.

[0015] Preferably, the drain hole is connected to the primary slurry tank through a pipeline. When the flue gas carrying droplets passes through the dewatering component, the droplets collide with the surface of the baffle blades under inertia and are captured. They then condense into a liquid film and slide down the baffle blades to the bottom of the flue gas reforming box, and are discharged through the drain hole to the primary slurry tank.

[0016] Turbulent flue gas from the primary absorption tower enters the flue gas reforming chamber, and successively passes through the staged uniform flow of the flow stabilizing guide component, the zoned flow regulation of the flow deviation correction component, and the inertial dehydration of the dehydration component. Finally, it enters the secondary absorption tower in a state of uniform flow velocity, straight flow direction and low droplet content, thus providing a strong guarantee for the efficient and stable operation of the secondary absorption tower.

[0017] Preferably, the liquid-to-gas ratio of the primary spray mechanism is higher than that of the secondary spray mechanism, and the Soter average droplet size formed by the nozzles used in the primary spray mechanism is greater than that formed by the nozzles used in the secondary spray mechanism.

[0018] Preferably, the primary spraying mechanism consists of multiple sets arranged vertically in parallel. In this embodiment, there are four sets of primary spraying mechanisms. The simultaneous spraying of the four sets of primary spraying mechanisms increases the spraying density and spraying volume of the slurry, thereby increasing the liquid-to-gas ratio of the primary spraying mechanism. In this embodiment, the secondary spraying mechanism consists of two sets arranged vertically in parallel.

[0019] Preferably, both the primary spraying mechanism and the secondary spraying mechanism include multiple layers of spray pipes arranged in a circular pattern, each spray pipe is provided with several atomizing nozzles, and the spray pipes are connected and fixed together by connecting pipes.

[0020] Preferably, a primary slurry tank is set at the bottom of the primary absorption tower. The particulate matter captured in the primary absorption tower is mixed with the spray slurry and falls into the primary slurry tank. The primary slurry tank is connected to the spray pipe of the primary spraying mechanism through a pipeline, and a primary circulation pump is installed on the pipeline.

[0021] Preferably, a secondary slurry tank is set at the bottom of the secondary absorption tower. The particulate matter captured in the secondary absorption tower mixes with the spray slurry and falls into the secondary slurry tank. The secondary slurry tank is connected to the spray pipe of the secondary spraying mechanism through a pipeline, and a secondary circulation pump is installed on the pipeline. The upper part of the secondary slurry tank is provided with an inlet and the bottom is provided with an outlet. The inlet is connected to the fresh slurry supply pipe through a pipeline, and the outlet is connected to the primary slurry tank through a pipeline.

[0022] Fresh slurry is preferentially fed into the secondary slurry tank through the fresh slurry supply pipe to maintain the highly active slurry required for the fine removal in the secondary absorber. Slurry in the secondary slurry tank periodically flows to the primary slurry tank to replenish the slurry required for the coarse removal in the primary absorber. The primary absorber rapidly and economically removes most of the sulfur dioxide from the flue gas using a large spray volume and large-diameter slurry droplets, reducing the flue gas concentration to a low level. After treatment by the primary absorber, the sulfur dioxide concentration in the flue gas is significantly reduced. At this point, the primary absorber uses finer atomizing nozzles, a lower liquid-to-gas ratio, and a more chemically active slurry to focus on the deep removal of low-concentration sulfur dioxide. The primary and secondary absorbers work together to achieve stable ultra-low emissions.

[0023] Preferably, the primary demisting mechanism and the coalescence strengthening component are both baffle demisters, and the secondary demisting mechanism is a wire mesh demister.

[0024] In a second aspect, the present invention provides a desulfurization method utilizing the above-described system, comprising the following steps:

[0025] (1) Sulfur-containing flue gas enters the primary absorption tower for the main desulfurization reaction;

[0026] (2) The flue gas discharged from the first-stage absorption tower enters the inter-tower flue gas reforming unit, where flue gas flow stabilization, flow deviation correction and removal of entrained droplets are carried out in sequence.

[0027] (3) The reformed flue gas enters the secondary absorption tower for fine removal of low-concentration sulfur dioxide;

[0028] (4) The flue gas continues to pass through the agglomeration strengthening component and the secondary demisting mechanism, causing the fine droplets and aerosols to agglomerate, grow and be captured, and finally discharged through the flue gas outlet of the secondary absorption tower.

[0029] The beneficial effects of this invention are as follows:

[0030] 1. The present invention achieves clear functional classification and synergistic optimization of the primary and secondary absorption towers. By designing the primary absorption tower to operate in a "coarse desulfurization" mode and the secondary absorption tower to operate in a "fine desulfurization" mode, the two towers have clear responsibilities and complementary advantages, fundamentally avoiding the repeated washing and ineffective circulation caused by homogeneous series connection, and significantly reducing the overall energy consumption of the system while ensuring high desulfurization efficiency.

[0031] 2. By adding a flue gas reforming unit between the primary and secondary absorption towers, the side effects such as flow field turbulence and droplet entrainment caused by the "coarse stripping" of the primary tower are targeted and treated, providing uniform and clean inlet flue gas conditions for the stable and efficient operation of the secondary tower, so that the "fine stripping" capacity of the secondary absorption tower can be fully utilized.

[0032] 3. This invention achieves graded extraction of the chemical potential of the absorbent by supplying liquid to the primary and secondary absorption towers in stages, so that the highly active fresh slurry is preferentially used in the fine removal stage of the secondary absorption tower, and the used slurry is then recycled to the primary desulfurization stage of the primary absorption tower. This significantly reduces limestone consumption and operating costs. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the present invention;

[0034] Figure 2 This is a three-dimensional structural diagram of the flue gas reforming unit of the present invention;

[0035] Figure 3 This is a front view schematic diagram of the flue gas reforming unit of the present invention;

[0036] Figure 4 This is a front view schematic diagram of the primary absorption tower of the present invention;

[0037] Figure 5 This is a front view schematic diagram of the secondary absorption tower of the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of the grille-type guide plate of the present invention;

[0039] Figure 7 This is a schematic diagram of the porous guide plate of the present invention;

[0040] Figure 8 This is a schematic diagram of the deflection correction component of the present invention;

[0041] Figure 9 This is a schematic diagram of a set of dehydration components of the present invention;

[0042] Figure 10 This is a block diagram showing the slurry flow direction of the primary spraying mechanism and the secondary spraying mechanism of the present invention;

[0043] Figure 11 This is a schematic diagram of the structure of the present invention, which is a set of primary spraying mechanisms or a set of secondary spraying mechanisms;

[0044] As shown in the figure:

[0045] 1. Primary absorption tower; 11. Primary spraying system; 12. Primary demisting system; 13. Primary slurry tank;

[0046] 2. Flue gas reforming unit; 21. Flue gas reforming box; 22. Flow stabilizing guide component; 23. Flow deviation correction component; 24. Liquid removal component; 221. Grille-type guide plate; 222. Perforated guide plate; 231. Circular outer frame; 232. Longitudinal beam; 233. Crossbeam; 234. Blade; 241. Baffle blade.

[0047] 3. Secondary absorption tower; 31. Secondary spraying mechanism; 32. Agglomeration strengthening component; 33. Secondary demisting mechanism; 34. Secondary slurry tank; 35. Fresh slurry supply pipe. Detailed Implementation

[0048] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0049] like Figure 1-11 As shown, the present invention includes a primary absorption tower 1, an inter-tower flue gas reforming unit 2, and a secondary absorption tower 3, which are connected sequentially along the flue gas flow direction. The inter-tower flue gas reforming unit 2 is located between the outlet of the primary absorption tower 1 and the inlet of the secondary absorption tower 3, and is used to reform the state of the flue gas from the primary absorption tower 1.

[0050] The primary absorption tower 1 is equipped with a primary spraying mechanism 11 and a primary demisting mechanism 12 arranged sequentially from bottom to top. The secondary absorption tower 3 is equipped with a secondary spraying mechanism 31, an agglomeration strengthening component 32, and a secondary demisting mechanism 33 arranged sequentially from bottom to top. The liquid-to-gas ratio of the primary spraying mechanism 11 is higher than that of the secondary spraying mechanism 31, and the Sotter average droplet size formed by the nozzles used in the primary spraying mechanism 11 is larger than that formed by the nozzles used in the secondary spraying mechanism 31. Multiple sets of primary spraying mechanisms 11 are arranged in parallel vertically. In this embodiment, there are four sets of primary spraying mechanisms 11. The simultaneous spraying of the four sets of primary spraying mechanisms 11 increases the spraying density and spraying volume of the slurry, thereby increasing the liquid-to-gas ratio of the primary spraying mechanism 11. In this embodiment, two sets of secondary spraying mechanisms 31 are arranged in parallel vertically.

[0051] Both the primary spraying mechanism 11 and the secondary spraying mechanism 31 include multiple layers of spray pipes arranged in a circular pattern, with several atomizing nozzles on each spray pipe, and the spray pipes are connected and fixed together by connecting pipes.

[0052] The primary spraying mechanism 11 and the secondary spraying mechanism 31 provide liquid in stages. A primary slurry tank 13 is set at the bottom of the primary absorption tower 1. The particulate matter captured in the primary absorption tower 1 mixes with the sprayed slurry and falls into the primary slurry tank 13. The primary slurry tank 13 is connected to the spray pipe of the primary spraying mechanism 11 through a pipeline, and a primary circulation pump is installed on the pipeline.

[0053] A secondary slurry tank 34 is installed at the bottom of the secondary absorption tower 3. The particulate matter captured in the secondary absorption tower 3 mixes with the sprayed slurry and falls into the secondary slurry tank 34. The secondary slurry tank 34 is connected to the spray pipe of the secondary spraying mechanism 31 through a pipeline, and a secondary circulation pump is installed on the pipeline. The secondary slurry tank 34 has an inlet at the top and an outlet at the bottom. The inlet is connected to the fresh slurry supply pipe 35 through a pipeline, and the outlet is connected to the primary slurry tank 13 through a pipeline, and a valve is installed on this pipeline.

[0054] Fresh slurry is preferentially fed into the secondary slurry tank 34 through the fresh slurry supply pipe 35 to maintain the high-activity slurry required for the fine removal in the secondary absorber 3. The slurry in the secondary slurry tank 34 periodically flows to the primary slurry tank 13 to replenish the slurry required for the coarse removal in the primary absorber 1. The primary absorber 1 rapidly and economically removes most of the sulfur dioxide from the flue gas using a large spray volume and large-diameter slurry droplets, reducing the flue gas concentration to a low level. After treatment by the primary absorber 1, the sulfur dioxide concentration in the flue gas has been significantly reduced. At this point, the primary absorber 1 uses finer atomizing nozzles, a lower liquid-to-gas ratio, and a more chemically active slurry to focus on the deep removal of low-concentration sulfur dioxide. The primary absorber 1 and the secondary absorber 3 work together to achieve stable ultra-low emissions.

[0055] The primary demisting mechanism 12 and the coalescing reinforcement component 32 are both existing baffle demisters, and the secondary demisting mechanism 33 is an existing wire mesh demister. The structures of the baffle demister and the wire mesh demister are existing technologies and will not be described in detail here.

[0056] The inter-tower flue gas reforming unit 2 includes a horizontally arranged flue gas reforming box 21, a flow stabilizing guide component 22, a flow deviation correction component 23, and a liquid removal component 24 installed inside the flue gas reforming box 21 and arranged sequentially along the flue gas flow direction.

[0057] The flow stabilizing and guiding component 22 includes a grid-type guide plate 221 and a porous guide plate 222, which are sequentially fixed inside the flue gas reforming box 21 along the flue gas direction. The grid-type guide plate 221 is formed by a set of parallel longitudinal grids and a set of parallel transverse grids vertically fixed, creating a uniform grid channel. The grid-type guide plate 221 mainly serves to initially divide the airflow and disperse large vortices. The porous guide plate 222 is a circular plate with several uniformly distributed through holes. In this embodiment, three porous guide plates 222 are arranged in parallel. The porous guide plates 222 then perform secondary distribution and homogenization of the airflow, making the velocity distribution of the airflow exiting the component more uniform.

[0058] The deflection correction component 23 includes a circular outer frame 231 fixed to the inner wall of the flue gas reforming box 21, and a crossbeam 233 and a longitudinal beam 232 fixed to the circular outer frame 231. The crossbeam 233 and the longitudinal beam 232 divide the area inside the circular outer frame 231 into several independent adjustment zones. Each adjustment zone is equipped with several blades 234 that can swing at an angle. The blades 234 have a louvered structure.

[0059] In this embodiment, the crossbeams 233 and longitudinal beams 232 are arranged in parallel, and are fixedly connected in a "well" shape, dividing the area within the circular outer frame 231 into nine independent adjustment zones. The blades 234 in each adjustment zone are hinged together via a pivot, and are connected by an independent connecting rod and driven by an independent electric or pneumatic actuator. This allows for independent control of the opening angle of the blades 234 within each zone. The blades 234 are hinged to the connecting rod, and the opening angle is adjusted by pulling or pushing the connecting rod using the electric or pneumatic actuator. By adjusting the opening angle of the blades 234 in different adjustment zones, the flow area of ​​that zone can be locally changed, thereby specifically correcting the uneven distribution of velocity and concentration on the flue gas cross-section, achieving field equilibrium of flow rate and concentration, and correcting flow deviation. A flue gas detection mechanism for detecting the flue gas velocity distribution is installed at the flue gas outlet of the primary absorption tower 1. The flue gas detection mechanism is connected to the control unit circuit. In this embodiment, the flue gas detection mechanism is an existing pitot tube. The flue gas detection mechanism detects the flue gas velocity distribution of the flue gas cross section in real time and transmits the signal to the control unit. The control unit is an existing controller. The controller generates control commands based on the signal data and drives the deflection correction component 23 to operate, thereby completing the flue gas deflection correction.

[0060] The dewatering component 24 includes at least one baffle assembly consisting of multiple parallel baffle blades 241. The baffle blades 241 include alternating forward bends and reverse bends along the flue gas flow direction to form a continuous double-S-shaped corrugated structure. A drain hole is provided at the bottom of the flue gas reforming chamber 21 directly below the dewatering component 24. The drain hole is connected to the primary slurry tank 13 via a pipeline. When flue gas carrying droplets passes through the dewatering component 24, the droplets impact the surface of the baffle blades 241 under inertia and are captured. They then condense into a liquid film, slide down the baffle blades 241 to the bottom of the flue gas reforming chamber 21, and are discharged through the drain hole to the primary slurry tank 13. Turbulent flue gas from the primary absorption tower 1 enters the flue gas reforming chamber 21, and successively passes through the staged uniform flow of the flow stabilizing guide component 22, the zoned flow regulation of the flow deviation correction component 23, and the inertial dehydration of the dehydration component 24. Finally, it enters the secondary absorption tower 3 in a state of uniform flow velocity, straight flow direction and low droplet content, thus providing a strong guarantee for the efficient and stable operation of the secondary absorption tower 3.

[0061] The desulfurization method using the above system includes the following steps:

[0062] (1) Sulfur-containing flue gas enters the primary absorption tower 1 and comes into countercurrent contact with the slurry from the primary slurry tank 13 to carry out the main desulfurization reaction;

[0063] (2) The flue gas discharged from the first-stage absorption tower 1 enters the inter-tower flue gas reforming unit 2, where flue gas flow stabilization, flow deviation correction and removal of entrained droplets are carried out in sequence.

[0064] (3) The reformed flue gas enters the secondary absorption tower 3 and comes into countercurrent contact with the slurry from the secondary slurry tank 34 to carry out a fine removal reaction of low concentration sulfur dioxide; wherein, the slurry in the secondary slurry tank 34 is prepared by fresh slurry that is periodically replenished by the fresh slurry supply pipe 35; part of the slurry in the secondary slurry tank 34 flows through the pipeline to the primary slurry tank 13 as the slurry of the primary absorption tower 1;

[0065] (4) The flue gas continues to pass through the agglomeration strengthening component 32 and the secondary demisting mechanism 33, causing the fine droplets and aerosols to agglomerate, grow and be captured, and finally discharged through the flue gas outlet of the secondary absorption tower 3.

[0066] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A dual-tower desulfurization system based on flue gas reforming and slurry staged supply, characterized in that: It includes a primary absorption tower, an inter-tower flue gas reforming unit, and a secondary absorption tower that are connected sequentially along the flue gas flow direction; The inter-tower flue gas reforming unit is located between the outlet of the primary absorption tower and the inlet of the secondary absorption tower, and is used to reform the flue gas from the primary absorption tower. The inter-tower flue gas reforming unit includes a horizontally arranged flue gas reforming box, a flow stabilizing guide component, a flow deviation correction component, and a liquid removal component installed in the flue gas reforming box and arranged sequentially along the flue gas flow direction. The primary absorption tower is equipped with a primary spraying mechanism and a primary demisting mechanism from bottom to top. The secondary absorption tower is equipped with a secondary spraying mechanism, a coalescence strengthening component, and a secondary demisting mechanism from bottom to top. The primary and secondary spraying mechanisms provide liquid in stages.

2. The dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: The flow stabilizing and guiding component includes a grid-type guide plate and a perforated guide plate that are sequentially fixed inside the flue gas reforming box along the flue gas direction.

3. The dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: The deflection correction component includes a circular outer frame fixed to the inner wall of the flue gas reforming box, and crossbeams and longitudinal beams fixed to the circular outer frame. The crossbeams and longitudinal beams divide the area inside the circular outer frame into several independent adjustment zones. Each adjustment zone is equipped with several blades that can swing at an angle, and the blades have a louvered structure.

4. The dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: The two horizontal beams and two vertical beams are arranged in parallel. The two horizontal beams and two vertical beams are fixedly connected in a "well" shape and divide the area within the circular outer frame into nine independent adjustment zones. The blades in each adjustment zone are hinged by a rotating shaft and connected by an independent connecting rod. They are driven by an independent electric or pneumatic actuator, so that the opening and closing angle of the blades in each zone can be controlled independently.

5. The dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: The dewatering component includes at least one layer of baffle plate group consisting of multiple parallel baffle blades. The baffle blades include forward bending portions and reverse bending portions arranged alternately along the flue gas flow direction to form a continuous double S-shaped corrugated structure. A drain hole is provided at the bottom of the flue gas reforming box corresponding to the position directly below the dewatering component.

6. The dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: The liquid-to-gas ratio of the primary spray mechanism is higher than that of the secondary spray mechanism, and the Soter average droplet size formed by the nozzles used in the primary spray mechanism is greater than that formed by the nozzles used in the secondary spray mechanism.

7. A dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: Both the primary and secondary spraying mechanisms include multiple layers of spray pipes arranged in a circular pattern, with several atomizing nozzles on each spray pipe, and the spray pipes are connected and fixed together by connecting pipes.

8. A dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: A primary slurry tank is set up at the bottom of the primary absorption tower. The particulate matter captured in the primary absorption tower mixes with the spray slurry and falls into the primary slurry tank. The primary slurry tank is connected to the spray pipe of the primary spraying mechanism through a pipeline, and a primary circulation pump is installed on the pipeline.

9. A dual-tower desulfurization system based on flue gas reforming and slurry staged supply according to claim 1, characterized in that: A secondary slurry tank is set at the bottom of the secondary absorption tower. The particulate matter captured in the secondary absorption tower mixes with the spray slurry and falls into the secondary slurry tank. The secondary slurry tank is connected to the spray pipe of the secondary spraying mechanism through a pipeline, and a secondary circulation pump is installed on the pipeline. The upper part of the secondary slurry tank is set with an inlet and the bottom is set with an outlet. The inlet is connected to the fresh slurry supply pipe through a pipeline, and the outlet is connected to the primary slurry tank through a pipeline.

10. A desulfurization method using the system according to any one of claims 1-9, characterized in that, Includes the following steps: (1) Sulfur-containing flue gas enters the primary absorption tower for the main desulfurization reaction; (2) The flue gas discharged from the first-stage absorption tower enters the inter-tower flue gas reforming unit, where flue gas flow stabilization, flow deviation correction and removal of entrained droplets are carried out in sequence. (3) The reformed flue gas enters the secondary absorption tower for fine removal of low-concentration sulfur dioxide; (4) The flue gas continues to pass through the agglomeration strengthening component and the secondary demisting mechanism, causing the fine droplets and aerosols to agglomerate, grow and be captured, and finally discharged through the flue gas outlet of the secondary absorption tower.

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