A dry desulfurization and denitrification reactor and a method of using the same

Abstract

The application discloses a dry desulfurization and denitrification reactor and a use method thereof, relates to the technical field of dry desulfurization and denitrification, and comprises the reactor and a flow guide plate fixedly arranged in the reactor, a spindle and a fan-shaped block fixedly arranged in the reactor, and the spindle and the fan-shaped block are arranged in a staggered mode on a vertical section of the reactor; the fan-shaped block comprises a tip end and a fan surface end arranged oppositely. The dry desulfurization and denitrification reactor and the use method thereof effectively distribute the flue gas flow by the staggered arrangement of the spindle and the fan-shaped block, and improve the denitrification efficiency by the special shape and orientation of the fan-shaped block. The SO2 escaping from the flue gas is absorbed by the setting of the crystal surface, and the active sites of the catalyst layer are prevented from being competed by SO2. The filter screen mechanically shakes off the accumulated dust by periodic state switching, and the problem that internal components are prone to dust accumulation in the dry process is solved.

Description

Technical Field

[0001] This invention relates to the field of dry desulfurization and denitrification technology, and more specifically to a dry desulfurization and denitrification reactor and its usage method. Background Technology

[0002] Currently, flue gas generated from industrial processes such as coal-fired boilers and metallurgical sintering contains large amounts of sulfur oxides (SOx) and nitrogen oxides (NOx), which are major precursors to acid rain and smog. Common flue gas treatment technologies include wet, semi-dry, and dry methods. Among them, dry desulfurization and denitrification technologies have attracted attention due to their advantages such as no wastewater generation, simple system, and relatively low investment and operating costs.

[0003] Existing dry reactors typically employ the injection of absorbents (such as sodium bicarbonate, quicklime, ammonia, etc.) in conjunction with bag filters or electrostatic precipitators. However, these technologies share some common problems: uneven flow field distribution of flue gas within the reactor leads to insufficient mixing of the absorbent and pollutants, resulting in low reaction efficiency; byproducts or dust generated during the reaction easily deposit and scale on the internal components of the reactor, increasing system resistance and affecting the long-term stable operation of the equipment.

[0004] Currently used desulfurization and denitrification reactors typically desulfurize first, then pass the desulfurized flue gas into the denitrification reactor. However, when escaped SO2 is present in the flue gas, SO2 and NOx, when present simultaneously, compete for adsorption sites on the activated carbon surface. Since SO2 is usually more concentrated and has stronger adsorption capacity, it will be preferentially adsorbed, thereby inhibiting the removal efficiency of NOx. Summary of the Invention

[0005] The purpose of this invention is to provide a dry desulfurization and denitrification reactor and its usage method to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a dry desulfurization and denitrification reactor, comprising a reactor and a flow guide plate fixedly disposed therein, and further comprising a spindle body and a fan-shaped block fixedly disposed inside the reactor, wherein the spindle body and the fan-shaped block are arranged in an alternating manner on the vertical cross section of the reactor.

[0007] The sector block includes a pointed tip and a fan-shaped end that are arranged opposite each other, with the pointed tip facing the air inlet of the reactor so that the airflow flows along both sides of the sector block.

[0008] An ammonia injection port is positioned corresponding to the centerline of the sector block and facing the gas inlet of the reactor;

[0009] It also includes a filter screen positioned between the spindle body and the fan-shaped block, which has both vertical and tilted states to shake off soot during state switching.

[0010] Preferably, the cross-sectional area of ​​the spindle decreases along the air intake direction so that the air intake is guided to the tail end.

[0011] Preferably, the first end of the spindle body is located on the front side of the sector block.

[0012] Preferably, the two ends of the filter screen are slidably engaged with the sides of the spindle body and the fan-shaped block, respectively.

[0013] Preferably, the device also includes a transmission rod that is slidably disposed within the reactor, and a limiting member for driving the filter screen is fixedly disposed on the transmission rod.

[0014] Preferably, the limiting member has a sliding groove, and a protrusion for keeping the filter screen in a vertical position is fixedly provided on the sliding groove.

[0015] Preferably, the spindle body has grooves, and the filter screen includes a scraper for scraping the grooves.

[0016] Preferably, the filter also includes a dust collection port and a recovery port located inside the reactor, with the dust collection port and the recovery port respectively located on both sides of the filter screen.

[0017] Preferably, a spray pipe is also included on the leeward side of the filter.

[0018] A method for using a dry desulfurization and denitrification reactor, comprising the dry desulfurization and denitrification reactor described in the above scheme, includes the following steps:

[0019] Step 1: The desulfurized flue gas is transported to the reactor by a blower;

[0020] Step 2: Open the ammonia injection port;

[0021] Step 3: During the flue gas emission process, the transmission rod is periodically driven to switch the filter screen, causing the filter screen to switch intermittently between tilted and vertical states. During the switching process, the soot intercepted by the filter screen on the air inlet side falls into the dust collection port.

[0022] Step 4: After the flue gas emission is completed, turn on the spray pipes for final cleaning.

[0023] In the above technical solution, the dry desulfurization and denitrification reactor and its usage method provided by the present invention have the following beneficial effects: Through the staggered arrangement of spindle-shaped bodies and fan-shaped blocks, and the design of the special shape and orientation of the fan-shaped blocks, the flue gas flow is effectively evenly distributed, improving the denitrification efficiency. The crystallization surface absorbs SO2 escaping from the flue gas, preventing SO2 from competing for active sites in the catalyst layer. The filter screen mechanically shakes off accumulated ash through periodic state switching, solving the problem of easy ash accumulation in internal components during dry processes. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 This is an overall three-dimensional schematic diagram provided for an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a spindle body and sector block layout structure provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of another spindle body and sector block layout structure provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the internal structure of the reactor provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the internal flow field structure of the reactor provided in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the vertical state structure of the filter screen provided in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the filter activity switching process provided in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the transmission rod and limiting component provided in an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the protrusion, roller, and filter structure provided in an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the filter and limiting component structure provided in an embodiment of the present invention;

[0035] Figure 11 A schematic diagram of the spindle body and filter structure provided in the embodiments of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Reactor; 11. Drainage plate; 12. Dust collection port; 13. Recovery port; 2. Filter screen; 21. Drive rod; 22. Limiting component; 221. Slide groove; 222. Protrusion; 23. Spindle body; 231. Groove; 232. Scraper; 24. Fan-shaped block; 241. Crystallization surface; 25. Telescopic rod; 26. Roller; 27. Protrusion; 3. Ammonia injection port; 31. Conveying port; 4. Catalyst layer; 5. Spray pipe. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1-11 As shown, a dry desulfurization and denitrification reactor includes a reactor 1 and a flow guide plate 11 fixedly installed inside it. It also includes a spindle body 23 and a fan-shaped block 24 fixedly installed inside the reactor 1, with the spindle body 23 and the fan-shaped block 24 arranged in a staggered manner on the vertical cross-section of the reactor 1 (e.g., ...). Figure 2 and Figure 3 As shown, where Figure 2 and Figure 3 The two spatial layouts of the spindle body 23 and the sector block 24 are shown respectively. Figure 2 The length direction of the spindle body 23 and the sector block 24 is parallel to the height direction of the reactor 1, and Figure 3 The length direction of the spindle body 23 and the sector block 24 is parallel to the width direction of the reactor 1.

[0040] The sector block 24 includes a pointed tip and a fan-shaped end that are arranged opposite to each other, with the pointed tip facing the air inlet of the reactor 1 so that the airflow flows along both sides of the sector block 24.

[0041] The ammonia injection port 3 is positioned corresponding to the centerline of the sector block 24 and facing the air inlet of reactor 1 (e.g., Figure 5 (as shown)

[0042] It also includes a filter screen 2 disposed between the spindle body 23 and the fan-shaped block 24, which has two states: vertical and inclined, so as to shake off soot during the state switching process.

[0043] Specifically, the guide plates 11 are welded or fixed to the air inlet of the reactor 1 by a bracket. The guide plates 11 are arranged in a circumferential array to form an air inlet channel that gradually widens, thus performing preliminary rectification on the raw flue gas entering the reactor 1. The spindle body 23, the fan-shaped block 24, and the filter screen 2 are all located at the wide end. The reactor also includes a catalyst layer 4. The arrangement of the catalyst layer 4 is common knowledge to those skilled in the art and will not be described in detail here.

[0044] Furthermore, the spindle body 23 has a streamlined cross-section, with its long axis arranged along the flue gas flow direction, mainly serving to guide and evenly distribute the airflow. The fan-shaped block 24 has a crystalline surface 241 (e.g., ...) on its fan-shaped end surface. Figure 8 As shown), the ammonia injection port 3 is used to connect to the ammonia injection grid, and also includes a conveying port 31 for supplying ammonia gas (as shown). Figure 1 As shown in the figure, the conveying port 31 is equipped with a regulating valve for adjusting the ammonia flow rate. This device is existing technology and will not be described in detail here. The ammonia gas is ejected directly towards the crystallization surface 241 of the sector block 24.

[0045] After the high-temperature flue gas impacts the tip of the fan-shaped block 24 from the inlet, it is divided and diffused. At this time, as the flue gas flows along both sides of the fan-shaped block 24, it is subjected to the wall adhesion effect and forms a shear layer. The flue gas flow direction can be referenced. Figure 5 As indicated by the middle arrow, the shear layer exhibits a wake vortex a during the interaction process (with...). Figure 5 (The selected area in the middle frame is used as a reference), that is, small vortices appear at the fan-shaped end of the sector block 24 (refer to the vortex model shown in "Experimental Study on the Evolution Characteristics of Wake Structure in Near-Wall Cylindrical Flow"). The ammonia gas ejected from the ammonia injection port 3 is fully broken and mixed by the small vortices, thereby promoting the full mixing of ammonia gas and flue gas and improving reaction efficiency. However, in this process, NOx and NH3 undergo a reduction reaction to produce N2 and H2O, while ammonia water can directly react with SO2 in the flue gas to produce sulfate. Some sulfate droplets will adhere to the ammonia injection port 3, causing nozzle blockage.

[0046] To address the aforementioned issues, the ammonia injection port 3 is positioned within the wake vortex a. The presence of the crystallization surface 241 provides preferential crystallization attachment sites for reaction products (such as ammonium sulfate and ammonium nitrate). This promotes the reaction of the mixed NH3 with SOx and NOx in the flue gas on its surface, forming crystalline salts. The reaction products preferentially and spontaneously nucleate and grow on the crystallization surface 241, rather than on the surface of the ammonia injection port 3. Furthermore, the formation of crystalline salts also helps absorb SO2 escaping from the flue gas, preventing escaped SO2 from preferentially occupying the active sites of activated carbon, thereby improving NOx removal efficiency. Moreover, since the ammonia injection port 3 is located inside the vortex region, and there is a flow field boundary between the vortex region and the surface of the crystallization surface 241 where the main reaction occurs, a "protective gas curtain" is formed. This significantly reduces the possibility of sulfate droplets or crystals flowing back towards the ammonia injection port 3 and attaching there, thus reducing the problem of crystallization clogging of the ammonia injection port 3.

[0047] A filter screen 2 is assembled between the spindle body 23 and the sector block 24 (details of the assembly method are described below). The upper part of the filter screen 2 is connected to the inner wall of the reactor 1 via a rotating shaft, and the lower part is connected to the output end of the drive rod to achieve the rotation of the filter screen 2. The drive rod is connected to an external drive mechanism (such as a cylinder). Under normal operating conditions, the filter screen 2 is in an inclined state (e.g., ...). Figure 4 As shown), it performs initial interception of large particulate dust in the flue gas. The control system will activate the drive mechanism at regular intervals (e.g., every 30 minutes), pulling or pushing the drive rod to switch filter 2 to a vertical position (as shown). Figure 6 As shown in the figure, the dirt attached to it is shaken off by gravity, completing one cleaning cycle.

[0048] The aforementioned technology effectively distributes the flue gas flow and improves denitrification efficiency through the staggered arrangement of spindle bodies 23 and fan-shaped blocks 24, as well as the special shape and orientation of the fan-shaped blocks 24. The crystallization surface 241 absorbs SO2 escaping from the flue gas, preventing SO2 from competing for the active sites of the catalyst layer 4. The filter screen 2 mechanically shakes off accumulated ash through periodic state switching, solving the problem of easy ash accumulation in internal components during dry processes.

[0049] As a further embodiment of the present invention, the cross-sectional area of ​​the spindle body 23 decreases along the air intake direction so that the air intake is guided to the tail end.

[0050] Specifically, the first end of the spindle body 23 is located in front of the fan-shaped block 24. The larger cross-sectional area at the first end of the spindle body 23 can guide the flue gas flow from the guide plate 11. Then, utilizing its tapering shape, it guides the flue gas to flow out towards its tail end (smaller end), causing the flue gas to converge and gather at the tail end of the spindle body 23. Figure 5 The flue gas converges within the area selected by box b. The flue gas converges at the tail end of the spindle 23, and the horizontal projection of the tail end of the spindle 23 is connected end to end with the projection of the sector block 24. This means that the shear layer formed on both sides of the sector block 24 will be affected by the converging airflow from the tail end of the spindle 23, thus causing the airflow to form a stable wake vortex a after passing through the sector block 24, ensuring a highly ordered and controllable flow field inside the reactor 1.

[0051] As another embodiment of the present invention, the two ends of the filter screen 2 are slidably engaged with the sides of the spindle body 23 and the fan-shaped block 24, respectively.

[0052] Specifically, a roller 26 is rotatably mounted on the first end of the filter screen 2, and both the upper and lower ends of the roller 26 extend out of the filter screen 2. An arc groove (e.g., [missing information]) is formed on the fan-shaped block 24 to slide and engage with the upper and lower ends of the roller 26. Figure 9 As shown in the diagram, the roller 26 slides tightly against the side of the fan-shaped block 24. Furthermore, a protrusion 27 is fixedly provided at the second end of the filter screen 2, and the protrusion 27 slides against the side of the spindle body 23. Both the roller 26 and the protrusion 27 of the filter screen 2 are slidably connected to the inner wall of the reactor 1.

[0053] As a further embodiment of the present invention, it also includes a transmission rod 21 slidably disposed within the reactor 1, and a limiting member 22 for driving the filter screen 2 is fixedly disposed on the transmission rod 21 (e.g., Figure 8 (As shown).

[0054] Specifically, a telescopic rod 25 is fixedly installed on the reactor 1, wherein the extended end of the telescopic rod 25 is fixedly connected to the transmission rod 21 so that the transmission rod 21 can be driven to slide back and forth in the horizontal direction through the telescopic rod 25. A sliding groove 221 is provided on the limiting member 22, and a protrusion 222 for keeping the filter screen 2 in a vertical state is fixedly installed on the sliding groove 221.

[0055] Taking the tilted state of filter 2 as the initial state, such as Figure 7 As shown by the dashed line, the telescopic rod 25 is in the retracted state at this time. The first end of the filter screen 2 is close to the fan-shaped end of the fan-shaped block 24, and the second end is close to the head end of the spindle body 23. The telescopic rod 25 starts after receiving a control signal, pushing the transmission rod 21 to move horizontally. The limiting member 22 fixed to the transmission rod 21 moves accordingly, and the limiting member 22 presses against the protrusion 27 (e.g., through the sliding groove 221) via the sliding groove 221. Figure 10 As shown, since the roller 26 at the first end of the filter screen 2 is constrained in the arc groove of the fan-shaped block 24, the end is forced to roll and rise along the arc trajectory defined by the arc groove, and the protrusion 27 also slides along the side of the spindle body 23, while the protrusion 27 slides inside the groove 221.

[0056] Finally, the protrusion 27 slides to the tail end of the spindle body 23, while the roller 26 slides towards the tip of the sector block 24, and the filter 2 moves to the position shown. Figure 7 The solid line section. At this time, the dirt attached to the filter screen 2 is shaken off by gravity. During the sliding process of the protrusion 27, it abuts against the protrusion 222. The protrusion 222 is made of elastic plastic triangular block, which can deform within a certain range. Therefore, during the sliding process, the protrusion 27 first squeezes the protrusion 222 along the inclined surface of the protrusion 222, so that the protrusion 222 stores force. Then, after the protrusion 27 passes through the tip of the protrusion 222, the stored force of the protrusion 222 is released, so that the protrusion 27 is stuck by the protrusion 222 and kept in a vertical position.

[0057] Furthermore, the rebound action of the protrusion 222 generates a slight impact, causing the locking surface of the protrusion 222 to engage with the corresponding surface of the protrusion 27. This action reliably locks the protrusion 27 (i.e., the entire filter screen 2) in the predetermined vertical position, preventing it from shaking under the impact of flue gas; on the other hand, the instantaneous rebound force of the protrusion 222 is transmitted to the entire filter screen 2 through the protrusion 27, causing a high-frequency, low-amplitude secondary vibration of the filter screen fibers.

[0058] When cleaning is required again, the telescopic rod 25 retracts and pushes the transmission rod 21 to move. The protrusion 222 on the transmission rod 21 applies a reverse force to the protrusion 27 through its inclined structure, forcing the protrusion 222 to elastically deform again, thereby easily releasing the lock and allowing the filter screen 2 to smoothly begin the next cleaning cycle.

[0059] As a further embodiment of the present invention, the spindle body 23 has a groove 231, and the filter screen 2 includes a scraper 232 for scraping the groove 231 (e.g., ...). Figure 11 ).

[0060] Specifically, during the movement of filter 2, the protrusion 27 at its second end and the scraper 232 scrape across the surface of the spindle body 23 and its grooves 231. This actively cleans the accumulated dust on the surface of the spindle body 23, preventing it from changing its aerodynamic shape due to dust accumulation and ensuring the long-term stability of the flow field. Furthermore, since the tail end of the spindle body 23 is the junction of flue gas and air (i.e.,... Figure 5 (The area selected by the box in middle b) means that the tail end of the spindle body 23 may also crystallize due to the aggregation of sulfate droplets or crystals. The cleaning by the scraper 232 can effectively reduce the adhesion of crystals.

[0061] As a further embodiment of the present invention, a dust collection port 12 and a recovery port 13 are provided inside the reactor 1, and the dust collection port 12 and the recovery port 13 are respectively provided on both sides of the filter screen 2.

[0062] Specifically, the spray pipe 5 is located on the leeward side of the filter screen 2. The side of the filter screen 2 facing the air inlet is the air inlet side, and the opposite side is the leeward side. The dust collection port 12 is used to collect the dust intercepted on the air inlet side of the filter screen 2, while the recovery port 13 is used to collect the crystals scraped off by the scraper 232. The reactor 1 is cleaned at regular intervals. Through the spray of the spray pipe 5, the cleaning liquid penetrates the air inlet side of the filter screen 2 from the leeward side, which can flush out the fine particles that are blocked deep in the fibers of the filter screen 2. The cleaning effect is far better than that of washing in the same direction. The liquid flow can further remove the dust remaining on the filter screen. In addition, the cleaning liquid flowing through the filter screen 2 will continue to flow downward, washing the surface of the internal components such as the fan-shaped block 24 and the spindle body 23 on the air inlet side of the filter screen 2, dissolving or washing away any slight dust or crystal layer that may exist on their surface. Then, the dust is recovered through the dust collection port 12 and the recovery port 13, realizing the source separation and collection of fly ash and valuable crystallized by-products.

[0063] A method for using a dry desulfurization and denitrification reactor, applied to the aforementioned dry desulfurization and denitrification reactor, comprises the following steps:

[0064] Step 1: The desulfurized flue gas is transported to reactor 1 by a blower;

[0065] Step 2: Open ammonia injection port 3;

[0066] Step 3: During the flue gas emission process, drive the transmission rod 21 periodically to make the filter screen 2 move and switch, so that the filter screen 2 intermittently switches between tilted and vertical states. During the switching process, the soot intercepted by the air inlet side of the filter screen 2 falls into the dust collection port 12.

[0067] Step 4: After the flue gas is discharged, turn on spray pipe 5 for final cleaning.

[0068] Working principle:

[0069] Step 1: The desulfurized flue gas is transported to reactor 1 by a blower. The flue gas is first rectified by the guide plate 11 and then flows evenly towards the spindle body 23. Under the convergence and guidance of the spindle body 23, the flue gas forms a high-speed jet at its tail end. At the same time, the flue gas is divided and flows along both sides of the fan-shaped block 24, generating a wall attachment effect and forming a stable, high-intensity vortex wake region vortex a at its rear.

[0070] Step 2: Open ammonia injection port 3. Ammonia gas is injected into the core of the wake a, where it is broken up and entrained by the high-speed vortex, mixing with the flue gas. As the mixed gas flows through the crystallization surface 241, crystalline salt is formed, and the microcrystals are carried away by the flue gas. Finally, the gas passes through filter screen 2, where its remaining solid particles are intercepted, and the intercepted fly ash adheres to the air inlet side of filter screen 2.

[0071] Step 3: During flue gas emission, the transmission rod 21 is periodically driven to switch the filter screen 2, causing it to intermittently switch between tilted and vertical positions. During this switching process, the soot intercepted on the air inlet side of the filter screen 2 falls into the dust collection port 12. The telescopic rod 25 starts upon receiving a control signal, pushing the transmission rod 21 to move horizontally. The limiting member 22 fixed to the transmission rod 21 moves accordingly, and the limiting member 22 presses against the protrusion 27 (e.g., through the sliding groove 221) via the sliding groove 221. Figure 10 As shown, since the roller 26 at the first end of the filter screen 2 is constrained in the arc groove of the fan-shaped block 24, the end is forced to roll and rise along the arc trajectory defined by the arc groove, and the protrusion 27 also slides along the side of the spindle body 23, while the protrusion 27 slides inside the groove 221.

[0072] Finally, the protrusion 27 slides to the tail end of the spindle body 23, while the roller 26 slides towards the tip of the sector block 24, and the filter 2 moves to the position shown. Figure 7 The solid line indicates that the dirt adhering to filter screen 2 is shaken off by gravity.

[0073] Step 4: After the flue gas emission is completed, turn on the spray pipe 5 for final cleaning. Through the spray of the spray pipe 5, the cleaning liquid penetrates the air inlet side of the filter screen 2 from the leeward side, which can flush out the fine particles that are blocked deep in the fibers of the filter screen 2 in the opposite direction. The cleaning effect is far better than washing in the same direction.

[0074] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dry desulfurization and denitrification reactor comprising a reactor (1) and a flow guide plate (11) fixedly arranged in the reactor (1), characterized in that, It also includes a spindle body (23) and a fan-shaped block (24) fixedly installed inside the reactor (1), and the spindle body (23) and the fan-shaped block (24) are arranged in an alternating manner on the vertical cross section of the reactor (1); The sector block (24) includes a pointed tip and a fan-shaped end arranged opposite to each other, with the pointed tip facing the air inlet of the reactor (1) so that the airflow flows along both sides of the sector block (24); Ammonia injection port (3) is set in line with the center line of the sector block (24) and faces the air inlet end of the reactor (1); It also includes a filter screen (2) disposed between the spindle body (23) and the fan-shaped block (24), which has both vertical and inclined states to shake off soot during state switching; The head of the spindle (23) is located in front of the fan-shaped block (24). The large cross-sectional area of ​​the head of the spindle (23) can guide the flue gas flow from the guide plate (11). Then, by utilizing its gradually shrinking shape structure, the flue gas is guided to flow out to its tail end, so that the flue gas converges and gathers at the tail end of the spindle (23). The flue gas passes through the convergence at the tail end of the spindle (23), and the projection of the tail end of the spindle (23) in the horizontal direction is connected to the projection of the fan-shaped block (24). This makes the shear layer formed on both sides of the fan-shaped block (24) affected by the convergence of the airflow from the tail end of the spindle (23), so that the airflow forms a stable wake vortex a after passing through the fan-shaped block (24), ensuring the high order and controllability of the internal flow field of the reactor (1).

2. A dry desulphurization and denitrification reactor according to claim 1, characterized in that, The cross-sectional area of ​​the spindle body (23) decreases along the air intake direction so that the air intake is guided to the tail end.

3. The dry desulfurization and denitrification reactor according to claim 1, characterized in that, The two ends of the filter screen (2) are respectively slidably engaged with the sides of the spindle body (23) and the fan-shaped block (24).

4. The dry desulfurization and denitrification reactor according to claim 1, characterized in that, It also includes a transmission rod (21) that is slidably disposed in the reactor (1), and a limiting member (22) for driving the filter screen (2) is fixedly disposed on the transmission rod (21).

5. A dry desulphurization and denitrification reactor according to claim 4, characterized in that, The limiting member (22) has a groove (221) and a protrusion (222) is fixedly provided on the groove (221) to keep the filter screen (2) in a vertical position.

6. The dry desulfurization and denitrification reactor according to claim 1, characterized in that, The spindle body (23) has a groove (231) and the filter screen (2) includes a scraper (232) for scraping the groove (231).

7. The dry desulfurization and denitrification reactor according to claim 1, characterized in that, It also includes a dust collection port (12) and a recovery port (13) located inside the reactor (1), and the dust collection port (12) and the recovery port (13) are respectively located on both sides of the filter screen (2).

8. The dry desulfurization and denitrification reactor according to claim 1, characterized in that, It also includes a spray pipe (5) located on the leeward side of the filter (2).

9. A method of using a dry desulfurization and denitrification reactor, characterized by, The dry desulfurization and denitrification reactor, including any one of claims 1-8, comprises the following steps: Step 1: The desulfurized flue gas is transported to the reactor (1) by a blower; Step 2: Open the ammonia injection port (3); Step 3: During the flue gas emission process, drive the transmission rod (21) periodically to make the filter screen (2) switch between tilted and vertical states. During the switching process, the smoke and ash intercepted by the filter screen (2) on the air inlet side falls into the dust collection port (12). Step 4: After the flue gas is discharged, turn on the spray pipe (5) for final cleaning.

Images