A flue gas denitration SCR pre-filter device

Abstract

The present application belongs to the technical field of flue gas filtration, and specifically discloses a flue gas denitration SCR pre-filtering device, which comprises a spray tower, a spray denitration mechanism is arranged on the inner side of the spray tower, a water tank is arranged on one side of the outer side of the spray tower, an upper water mechanism is arranged in the water tank, an air inlet pipe is communicated and installed below the inner side of the spray tower, and a pre-blocking mechanism is arranged on the inner side of the air inlet pipe. The present application can control the flow of air inlet and quickly filter suspended matters at the air inlet pipe of flue gas, so as to guarantee the continuous use of the filtering structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field related to flue gas filtration, and specifically discloses a flue gas denitration SCR pre-filtering device. BACKGROUND

[0002] The flue gas denitration technology refers to a technology for removing nitrogen oxides in industrial flue gas through physical, chemical or biological methods, and is mainly used in industrial fields such as coal-fired power plants, steel plants and chemical plants;

[0003] The flue gas desulfurization is divided into three categories of desulfurization processes, namely, wet method, semi-dry method and dry method. The wet desulfurization technology is relatively mature, has high efficiency and is easy to operate;

[0004] When the flue gas enters the inside of the spray tower, a large amount of suspended matter is mixed, the suspended matter can cause the spray effect to be poor, and a large amount of impurities are deposited in the tower, which brings a lot of inconvenience to the later maintenance, so it is necessary to effectively treat the suspended matter in the pre-treatment. SUMMARY

[0005] The application aims to solve the problems in the background art, and provides a flue gas denitration SCR pre-filtering device, which comprises a spray tower, a spray denitration mechanism is arranged on the inner side of the spray tower, a water tank is arranged on one side of the outer side of the spray tower, an upper water mechanism is arranged in the water tank, an air inlet pipe is connected and arranged at the lower part in the spray tower, and a pre-blocking mechanism is arranged on the inner side of the air inlet pipe.

[0006] The pre-blocking mechanism comprises a support column fixedly arranged on the inner side of the air inlet pipe, and a fixed flocculation plate and a movable flocculation plate are crossly arranged in sequence on the outer side of the support column.

[0007] Preferably, the spray denitration mechanism comprises an air extraction fan installed on the upper side of the inner side of the spray tower, two groups of ring frames are symmetrically arranged on the inner side of the spray tower and below the air extraction fan, and a spray assembly is arranged on the inner side of each group of ring frames.

[0008] Preferably, the upper water mechanism comprises a pump body connected and arranged above the water tank, a pump suction pipe of the pump body extends to the bottom of the inner side of the water tank, a pump drainage pipe is connected and arranged with a conveying pipe, and the conveying pipe is connected and communicated with the spray assembly through a corresponding connecting pipe arranged at the inner side of the conveying pipe and at the two groups of ring frames.

[0009] Preferably, the movable flocculation plate slides on the outer end of the support column through a sliding ring arranged on the inner side of the movable flocculation plate, the fixed flocculation plate and the movable flocculation plate are connected through a spring arranged in common between the fixed flocculation plate and the movable flocculation plate, and a control assembly is arranged on the outer side of the sliding ring.

[0010] Preferably, the inside of the air inlet pipe and located at the rear end of the movable flocculation plate is provided with a filter screen, T-shaped rods are inserted in the inside of the filter screen, the two ends of the T-shaped rods are connected with the inner wall of the air inlet pipe, a gear ring is rotatably installed between the filter screen and the movable flocculation plate, a U-shaped frame is connected with the inner wall of the gear ring through a connecting rod arranged on one side, a plurality of connecting shafts are rotatably installed in the U-shaped frame, a clamping cylinder is threadedly installed at one end of the connecting shafts, and ash sweeping tables are installed at the end of the clamping cylinder, arc scraping strips are arranged on the front end surface of the ash sweeping tables, a gear is engaged with the outer gear ring, a motor is arranged in the gear, the output end of the motor is inserted into the gear, the motor is fixedly installed outside the air inlet pipe, and a plurality of filter holes are formed in the outer surface of the filter screen.

[0011] Preferably, the control assembly comprises a clamping ring rotatably installed outside the sliding ring, a movable arm is rotatably arranged on one side of the clamping ring, a connecting rod is rotatably installed at the inner side of the end of the movable arm away from the clamping ring, and the end of the connecting rod away from the movable arm is rotatably connected with the U-shaped frame through a connecting assembly.

[0012] Preferably, the connecting assembly comprises a movable joint, the movable joint is rotatably connected with the connecting rod, and the movable joint is fixedly arranged outside the U-shaped frame.

[0013] Preferably, an inclined abutting rod is arranged outside the support column, a plurality of rolling balls are movably clamped at the inner side of one end of the abutting rod, the inner surface of the movable arm is movably attached with the rolling balls, an ash storage box is communicatively installed below the inner side of the air inlet pipe and located at the front end of the filter screen, the inner side of the ash storage box is hollow, and a pull plate is slidably installed at the inner side of one end of the ash storage box.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] By arranging the fixed flocculation plate and the movable flocculation plate on the inner side of the air inlet pipe and adjusting the distance between the two through the control assembly, the amount of flue gas entering the front end can be controlled, the fixed flocculation plate and the movable flocculation plate are arranged staggered, which reduces the flow rate of the flue gas when entering the air inlet pipe, promotes the rear end filter screen to completely treat the suspended matter in the flue gas, and the control assembly enables the movable flocculation plate to move in and out of the staggered channel between the fixed flocculation plate, which also reduces the strength of the ash sweeping table and the arc scraping strip, thereby prolonging the service life of the ash sweeping table and the arc scraping strip.

[0016] The U-shaped frame can be rotated in cooperation with the gear ring, so that the ash sweeping table and the arc scraping strip in the U-shaped frame can remove the suspended matter on the front end surface of the filter screen, thereby ensuring the filtering effect of the filter screen. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The overall structure of the present application is shown in the schematic diagram.

[0018] Figure 2 The connection structure of the inner part of the spray tower of the present application is shown in the schematic diagram.

[0019] Figure 3 The connection structure of the inner part of the air inlet pipe of the present application is shown in the schematic diagram.

[0020] Figure 4 The connection structure between the tooth ring and the U-shaped frame of the present application is shown in the schematic diagram.

[0021] Figure 5 The connection structure between the card barrel and the ash removal platform of the present application is shown in the schematic diagram.

[0022] Figure 6 The connection structure of the control assembly of the present application is shown in the schematic diagram.

[0023] Figure 7 The connection structure of the present application Figure 4 The connection structure of the present application

[0024] Figure 8 The connection structure of the present application Figure 6 The connection structure of the present application

[0025] In the figure: 1, spray tower; 2, water tank; 3, conveying pipe; 4, pump body; 5, air inlet pipe; 6, fixed flocculation plate; 7, ash storage box; 8, support column; 9, air extraction fan; 10, ring frame; 11, pull plate; 12, tooth ring; 13, filter screen; 14, motor; 15, spring; 16, U-shaped frame; 17, filter hole; 18, connecting shaft; 19, card barrel; 20, ash removal platform; 21, circular arc scraping strip; 22, movable flocculation plate; 23, ball; 24, snap ring; 25, connecting rod; 26, sliding ring; 27, movable arm; 28, connecting rod; 29, movable joint; 30, abutting rod; 31, T-shaped rod; 32, spray assembly; 33, gear. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0027] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] As Figures 1-8The device is a flue gas denitration SCR pre-filter device, which comprises a spray tower 1, a spray tower 1 inside the spray tower 1 is provided with a spray desulfurization mechanism, the spray tower 1 outside one side is provided with a water tank 2, the water tank 2 is provided with a water supply mechanism inside, the spray tower 1 inside the lower part is communicated with the installation of air inlet pipe 5, the air inlet pipe 5 inside is provided with a pre-blocking mechanism.

[0029] The spray desulfurization mechanism comprises an air extractor 9 installed on the inside of the spray tower 1, two groups of ring frames 10 are symmetrically arranged on the inside of the spray tower 1 below the air extractor 9, and the inside of the two groups of ring frames 10 is provided with a spray assembly 32.

[0030] The air extractor 9 discharges the desulfurized gas from the top of the spray tower 1.

[0031] The water supply mechanism comprises a pump body 4 communicated and installed above the water tank 2, the pump body 4 suction pipe extends to the inside bottom of the water tank 2, the pump body 4 drain pipe is communicated and installed with a conveying pipe 3, the inside of the conveying pipe 3 and the two groups of ring frames 10 are communicated with the spray assembly 32 through the corresponding connection pipe;

[0032] Under the suction of the pump body 4, the catalyst in the water tank 2 can be sucked, and then sent to the inside of the spray assembly 32 by the conveying pipe 3;

[0033] The spray assembly 32 is composed of a four-way pipe and an atomizing nozzle.

[0034] The pre-blocking mechanism comprises a support column 8 fixedly arranged on the inside of the air inlet pipe 5, a fixed flocculation plate 6 and a movable flocculation plate 22 are sequentially and crossly arranged outside the support column 8, the movable flocculation plate 22 is slidably arranged on the outside of the rear end of the support column 8 through the sliding ring 26 arranged inside, the fixed flocculation plate 6 and the movable flocculation plate 22 are connected through the spring 15 arranged together, and the sliding ring 26 is provided with a control assembly outside.

[0035] The two ends of the spring 15 are respectively connected with the outer surfaces of the fixed flocculation plate 6 and the movable flocculation plate 22, the fixed flocculation plate 6 is fixedly arranged at the front end of the support column 8, and the movable flocculation plate 22 is flexibly slid on the rear end of the support column 8 through the sliding ring 26, when the control assembly pushes the movable flocculation plate 22, the size of the channel of the fixed flocculation plate 6 and the movable flocculation plate 22 is changed, the flow of flue gas is slowed down, and the effect of flue gas treatment is fully guaranteed, and the burden of the filter structure is also intermittently reduced.

[0036] A filter screen 13 is arranged inside the air inlet pipe 5 and located at the rear end of the movable flocculation plate 22, a T-shaped rod 31 is inserted in the middle of the filter screen 13, the two ends of the T-shaped rod 31 are connected with the inner wall of the air inlet pipe 5, a gear ring 12 is rotatably arranged inside the air inlet pipe 5 and located between the filter screen 13 and the movable flocculation plate 22, a U-shaped frame 16 is connected with the inner wall of the gear ring 12 through a connecting rod 28 arranged on one side, a plurality of connecting shafts 18 are rotatably arranged in the U-shaped frame 16, a clamping cylinder 19 is threadedly arranged at one end of the connecting shaft 18, and a dust sweeping table 20 is arranged at the end of the clamping cylinder 19, an arc scraping strip 21 is arranged on the front end surface of the dust sweeping table 20, a gear 33 is engaged with the outer gear of the gear ring 12, a motor 14 is arranged in the gear 33, the output end of the motor 14 is inserted into the gear 33, and the motor 14 is fixedly arranged outside the air inlet pipe 5, and a plurality of filter holes 17 are arranged on the outer surface of the filter screen 13;

[0037] The diameter of the filter hole 17 at the filter screen 13 can be selected or customized according to the filtering requirement, and the filter screen 13 can also be made of a high-molecular filter membrane to enhance the filtering effect.

[0038] The motor 14 drives the gear 33 to rotate, so that the gear ring 12 drives the U-shaped frame 16 to rotate, and the dust sweeping table 20 can be attached to the front end of the filter screen 13, and the arc scraping strip 21 can process the impurities and suspended matters blocked in front of the filter screen 13 in a circular manner;

[0039] The threaded connection of the clamping cylinder 19 and the connecting shaft 18 enables the dust sweeping table 20 to be easily disassembled according to the wear condition during subsequent maintenance.

[0040] The control assembly comprises a clamping ring 24 rotatably arranged outside the sliding ring 26, an active arm 27 rotatably arranged on one side of the clamping ring 24, a connecting rod 25 rotatably arranged at the inner side of the end of the active arm 27 away from the clamping ring 24, and a connecting assembly rotatably connected with the U-shaped frame 16 at the end of the connecting rod 25 away from the active arm 27, the connecting assembly comprising an active joint 29 rotatably connected with the connecting rod 25 and fixedly arranged outside the U-shaped frame 16, an inclined abutting rod 30 arranged outside the supporting column 8, a plurality of rolling balls 23 movably arranged at the inner side of one end of the abutting rod 30, and the inner surface of the active arm 27 movably attached to the rolling balls 23, a dust storage box 7 is arranged at the lower side of the air inlet pipe 5 and located at the front end of the filter screen 13, the inner side of the dust storage box 7 is hollow, and a pull plate 11 is slidably arranged at the inner side of one end of the dust storage box 7;

[0041] After being contacted by the active arm 27, the abutting rod 30 and the rolling ball 23 will cause the active arm 27 to expand towards one end, so that the connecting rod 25 rotates towards one end and moves the sliding ring 26.

[0042] The swept suspended matters and impurities can fall into the dust storage box 7 by gravity, and the dust can be discharged by pulling out the pull plate 11.

[0043] Working principle: in use, the inlet pipe 5 is communicated with the external flue gas discharge pipe, when the flue gas enters the inlet pipe 5, it will enter the filter screen 13 through the channel between the fixed flocculation plate 6 and the movable flocculation plate 22;

[0044] The fixed flocculation plate 6 and the movable flocculation plate 22 can reduce the flow rate when the flue gas enters, increase the passage of the originally straight pipeline, reduce the cross-sectional area of the flue gas passage, reduce the flow rate, prolong the residence time of the flue gas in front of the filter screen 13, and improve the suspended matter interception efficiency;

[0045] In order to ensure the use effect of the filter screen 13, the motor 14 drives the gear 33 to rotate, promotes the tooth ring 12 to drive the U-shaped frame 16 to rotate synchronously, and the multiple groups of ash sweeping tables 20 in the inner side of the U-shaped frame 16 can be scraped by the arc scraping strips 21 arranged at the end to adhere to the surface of the filter screen 13, so that the suspended matter is scraped off, the impurities falling down are settled into the ash storage box 7 due to gravity, so as to ensure the continuous filtering effect of the filter screen 13, and reduce the load of the filter screen 13;

[0046] And when the U-shaped frame 16 rotates, the movable joint 29 on the inner wall of the tooth ring 12 drives the connecting rod 25, the movable arm 27 and the snap ring 24 to rotate outside the sliding ring 26, when the movable arm 27 rotates to the abutting rod 30, the inner wall will contact the ball 23, since the abutting rod 30 is inclinedly arranged to extend to one side, the movable arm 27 rotates outward relative to the snap ring 24, the connecting rod 25 extends outward adaptively when the movable arm 27 moves, pushes the sliding ring 26 to move forward, and then changes the position of the movable flocculation plate 22, at this time, the channel between the movable flocculation plate 22 and the fixed flocculation plate 6 is shortened during the forward movement of the movable flocculation plate 22, so that the flow rate of the flue gas is slowed down, and then more flue gas entering the inlet pipe 5 can be fully blocked by the filter screen 13, the front filter structure can reduce the suspended matter deposition amount in the spray tower 1, and reduce the loss of the denitration catalyst.

[0047] The above shows and describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above examples, the above examples and descriptions in the specification are only the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A flue gas denitrification SCR pre-filtration device, comprising a spray tower, a spray denitrification mechanism disposed inside the spray tower, a water tank disposed on one side outside the spray tower, a water supply mechanism disposed inside the water tank, an air inlet pipe connected to the lower part of the spray tower, and a pre-blocking mechanism disposed inside the air inlet pipe; the pre-blocking mechanism comprises a support column fixedly disposed inside the air inlet pipe, and fixed turbulence plates and movable turbulence plates arranged in a crisscross pattern outside the support column; The inner side of the movable turbulence plate slides on the outer side of the rear end of the support column through a set slip ring. The fixed turbulence plate and the movable turbulence plate are connected by a common spring. A control component is set on the outer side of the slip ring. The control component includes a retaining ring rotatably mounted on the outside of the slip ring, a movable arm rotatably mounted on one side of the retaining ring, a connecting rod rotatably mounted on the inner side of the movable arm away from the retaining ring, and the end of the connecting rod away from the movable arm being rotatably connected to the U-shaped frame through a connecting component. The connecting assembly includes a movable joint, which is rotatably connected to the connecting rod, and the movable joint is fixedly mounted on the outside of the U-shaped frame; An inclined abutment rod is installed on the outside of the support column. A ball bearing is movably locked on one end of the abutment rod. The inner surface of the movable arm is in contact with the ball bearing. A dust collection box is installed below the inside of the air intake pipe and at the front end of the filter screen. The inside of the dust collection box is hollow, and a pull plate is slidably installed on one end of the inside of the dust collection box.

2. The flue gas denitrification SCR pre-filter device according to claim 1, characterized in that: The spray denitrification mechanism includes an exhaust fan installed above the inner side of the spray tower. Two sets of ring frames are symmetrically arranged inside the spray tower and below the exhaust fan. Spray components are arranged inside both sets of ring frames.

3. The flue gas denitrification SCR pre-filter device according to claim 1, characterized in that: The water supply mechanism includes a pump body installed above the water tank. The pump body's suction pipe extends to the bottom of the inner side of the water tank. The pump body's drain pipe is connected to a delivery pipe. The inner side of the delivery pipe, located at both sets of ring frames, is connected to the spray assembly through corresponding connecting pipes.

4. The flue gas denitrification SCR pre-filter device according to claim 1, characterized in that: A filter screen is installed inside the air intake pipe and at the rear end of the movable turbulence plate. A T-shaped rod is inserted through the middle of the filter screen, and both ends of the T-shaped rod are connected to the inner wall of the air intake pipe. A toothed ring is rotatably installed inside the air intake pipe and between the filter screen and the movable turbulence plate. A U-shaped frame is connected to one side of the inner wall of the toothed ring through a connecting rod. Multiple connecting shafts are rotatably installed inside the U-shaped frame. A retainer is threaded onto one end of each connecting shaft, and a dust-sweeping platform is installed at the end of each retainer. An arc-shaped scraper is provided on the front surface of the dust-sweeping platform. A gear is meshed with the outer teeth of the toothed ring. A motor is installed inside the gear. The output end of the motor is inserted inside the gear. The motor is fixedly installed outside the air intake pipe. Multiple sets of filter holes are opened on the outer surface of the filter screen.

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