CN108771963B - Two-way flow SCR denitrification facility - Google Patents
Two-way flow SCR denitrification facility Download PDFInfo
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- CN108771963B CN108771963B CN201810603421.1A CN201810603421A CN108771963B CN 108771963 B CN108771963 B CN 108771963B CN 201810603421 A CN201810603421 A CN 201810603421A CN 108771963 B CN108771963 B CN 108771963B
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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Abstract
The invention belongs to the technical field of flue gas purification, and particularly relates to a bidirectional flow SCR (selective catalytic reduction) denitration device which comprises a mixing chamber, an air suction module, a reaction chamber, a plugging module, a mixing module and a grinding module; the inner part of the mixing chamber is horizontally provided with a clapboard, and the two clapboards divide the inner cavity of the mixing chamber into an upper part, a middle part and a lower part; the air suction module is used for sucking ammonia gas and industrial waste gas into a cavity in the middle part of the mixing cavity; the reaction chamber is positioned on the right side of the mixing chamber, and at least two catalyst layers are vertically arranged in the reaction chamber at intervals; the plugging module is used for opening and closing the vent holes on the partition plate through the movement of the air suction module; the mixing module is used for fully mixing the ammonia gas and the industrial waste gas entering the mixing chamber; the grinding module is used for grinding the catalyst in the catalyst layer. According to the invention, a negative pressure suction mode is adopted, so that the gas can be fully and uniformly mixed, and the denitration efficiency is improved; meanwhile, the catalyst can be ground, and the utilization rate of the catalyst is high.
Description
Technical Field
The invention belongs to the technical field of flue gas purification, and particularly relates to a bidirectional flow SCR denitration device.
Background
NOx is a major source of atmospheric pollutants, and its emission in large quantities poses a great hazard to the environment. In order to protect the environment, NOx needs to be treated. The international widespread use of Selective Catalytic Reduction (SCR) is an effective method for treating NOx emissions from exhaust gases. The currently adopted SCR method reduces NOx to harmless N2 by using NH3 as a reducing agent under the action of a catalyst, thereby removing NOx in flue gas. The Selective Catalytic Reduction (SCR) is a flue gas denitration technology which is the most widely used in industry, can be applied to NOx emission control of combustion equipment such as power station boilers, industrial kilns and garbage incineration, can make the removal rate of NOx reach more than 90% in an ideal state, and is the best technology for treating fixed source NOx which can be found at present. Because of the influence of the contact area of the gas-solid, the flow field distribution of the flue gas in the tower body is uneven, the contact time of the flue gas with the reducing agent and the catalyst is limited, the catalytic reduction reaction efficiency is low, and the problems of NH3 escape, catalyst blockage, catalyst failure and the like are widely existed. Not only influence the improvement of denitration efficiency, cause the denitration cost to increase moreover, secondary pollution scheduling problem appears.
Patent document 1: the utility model provides a whirl atomizing SCR denitrification facility, application number: 201520897103
Patent document 2: a low temperature cyclic regeneration denitration catalytic unit, application number: 201510017591
In the above patent document 1, in order to increase the degree of uniform mixing between the flue gas and the reducing agent, a tangential swirl injection mode of ammonia gas along the circumferential direction of the flue gas channel is adopted, so that multiple pipelines are required to introduce the gas into the denitration tower, the difficulty of controlling the introduction of the flue gas and the reducing agent gas into the denitration tower is increased virtually, and the use cost is increased; meanwhile, the failure part of the catalyst cannot be effectively treated, so that the utilization efficiency of the catalyst is not high.
In patent document 2, the treatment method for the surface failure part of the catalyst is to drop the catalyst into a grinding device for grinding, and then pump the ground catalyst into a catalyst layer through a fan, so that the middle turnover process of the catalyst is increased, and the waste of the catalyst is easily caused; meanwhile, the dust can be sucked into the catalyst layer in a suction mode, and the actual effect is poor.
Disclosure of Invention
In order to make up for the defects of the prior art, the bidirectional flow SCR denitration device provided by the invention has the advantages that the gas is sucked into the mixing chamber to be fully stirred and mixed through the mutual matching work of the gas suction module, the plugging module and the mixing module, and then the gas is compressed and enters the reaction chamber, so that the full mixing of the gas is ensured; meanwhile, the catalyst can be ground by the grinding module to remove the failure layer on the surface of the catalyst, so that the utilization rate of the catalyst is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a bidirectional flow SCR denitration device, which comprises a mixing chamber, an air suction module, a reaction chamber, a plugging module, a uniformly mixing module and a grinding module, wherein the mixing chamber is provided with a gas inlet; a cavity structure is arranged in the mixing chamber, air inlets are formed in the bottom and the top of the mixing chamber, the air inlets are respectively used for introducing ammonia gas and industrial waste gas, and a partition plate is horizontally arranged in the mixing chamber; the mixing chamber is provided with an air outlet hole on the right side wall of the cavity positioned in the middle part, and the mixing chamber is provided with an automatic valve at the position of the air outlet hole; the air suction module is positioned in the cavity of the middle part of the mixing chamber and is used for sucking ammonia gas and industrial waste gas into the cavity of the middle part of the mixing chamber; the reaction chamber is positioned on the right side of the mixing chamber, a cavity structure is arranged in the reaction chamber, the cavity of the reaction chamber is communicated with the air outlet hole of the mixing chamber, at least two catalyst layers are vertically arranged in the reaction chamber at intervals and used for finishing SCR reaction; the blocking module is used for opening and closing the vent holes on the partition plate through the movement of the air suction module; the mixing module is arranged on the air suction module and is used for fully mixing the ammonia gas and the industrial waste gas entering the mixing chamber; the grinding module is positioned in the reaction chamber and is used for grinding the catalyst in the catalyst layer and removing the failed part of the surface layer of the catalyst; the air suction module comprises a screw, a motor and a sliding block; the screw is horizontally arranged in a cavity in the middle part of the mixing chamber; the sliding block is installed on the screw rod through threaded connection, the upper surface and the lower surface of the sliding block are in contact with the partition plate, and the sliding block can horizontally move along the screw rod; the motor is arranged on the outer wall of the mixing chamber, and the output shaft of the motor is connected with the screw. When the mixing chamber works, the motor drives the screw rod to rotate, and the sliding block moves left and right in the mixing chamber.
The plugging module comprises a deflector rod, a first spring, a roller and a plugging plate; the sliding block is provided with a sliding groove on the end surface which is in contact with the partition board along the longitudinal direction; the driving lever is arranged in the sliding groove of the sliding block through a spring I; the end face of the partition plate, which is in contact with the sliding block, is provided with a groove corresponding to the vent hole, the groove of the partition plate is communicated with the vent hole, and the number of the grooves of the partition plate is the same as that of the vent holes; the roller is vertically arranged in the groove of the sliding block, the roller is provided with a torsion spring at the installation part, the outer circumferential surface of the roller is provided with a tooth-shaped bulge, and the deflector rod can be in contact with the tooth-shaped bulge on the surface of the roller, so that the rotation of the roller is realized through the horizontal movement of the deflector rod; the plugging plate is fixedly connected with the roller, is positioned in the groove of the partition plate and is used for plugging the vent hole of the partition plate. When the motor drives the screw rod to rotate to enable the sliding block to move leftwards, the deflector rod can move the rollers at the position of the sliding block one by one along with the movement of the sliding block to enable the rollers to rotate, the rollers rotate to enable the plugging plate to be opened, ammonia gas and industrial waste gas enter a cavity in the middle of the mixing chamber through the air inlet, due to the existence of the torsion spring, the rollers slowly rotate in the reverse direction to enable the plugging plate to plug the air vent again, the sliding block continuously moves leftwards, the air vent is gradually opened and slowly closed, and therefore the mixing chamber is filled with mixed gas; then, the motor rotates reversely, the sliding block moves upwards, and compressed air is discharged into the reaction chamber through the air outlet to perform catalytic reduction reaction because the plugging plate is in a closed state.
The uniformly mixing module comprises a first gear, a first bevel gear, a second gear, an inner gear ring and a stirring blade; a tooth-shaped structure is arranged on the right end face of the deflector rod; the first gear is arranged in the sliding block and meshed with the shifting lever through a tooth-shaped structure; the first bevel gear and the gear are coaxially mounted, and the first bevel gear is located in the sliding block; the second bevel gear is meshed with the first bevel gear; the second gear and the second bevel gear are coaxially mounted, the second gear is mounted on the sliding block, and the second gear is located on the right side of the sliding block; the inner gear ring is rotatably arranged on the right end surface of the sliding block and is meshed with the gear II; the stirring blade is fixed on the right end face of the inner gear ring, and the stirring blade stirs and uniformly mixes the gas in the mixing chamber along with the rotation of the inner gear ring. In the process of the movement of the sliding block, the shifting rod moves up and down due to the contact with the gear, the shifting rod moves to drive the gear I to rotate, the inner gear ring on the right end face of the sliding block is driven by the bevel gear I and the bevel gear II to rotate, the rotation of the inner gear ring drives the stirring blades to continuously stir the ammonia gas and the industrial waste gas entering the mixing chamber, the uniform mixing of the gas is promoted, and the denitration efficiency is improved.
The grinding module comprises grinding rods, a supporting plate and a telescopic rod, the number of the grinding rods corresponds to that of the catalyst layers in the reaction chamber, the grinding rods penetrate into the catalyst layers from the lower end of the reaction chamber, and the grinding rods are used for grinding the catalyst; the supporting plate is positioned at the lower end of the grinding rod, the grinding rod is hinged with the supporting plate, and the middle part of the supporting plate is hinged to the ground; the telescopic link is fixed in ground, and the telescopic link upper end is articulated mutually with the backup pad, and the articulated position of telescopic link deviates from the center of backup pad. The in-process surface of catalyst in the catalyst layer can take place to become invalid at the in-process that carries out the denitration reaction, has hindered the continuation use of the inside active ingredient of catalyst, and after the catalyst top layer became invalid, the telescopic link promoted the backup pad and made the grinding rod move from top to bottom in the catalyst layer, realizes the grinding to the catalyst to the availability factor of catalyst has been improved.
The grinding rod is connected with the supporting plate through a connecting block; the connecting block comprises a fixed plate, an air bag, a second spring, a movable plate, an air pipe and a filter box; the outer surface of the grinding rod is provided with a spiral protrusion for improving the grinding effect, the spiral protrusion is provided with a slag inlet hole, the grinding rod is rotatably arranged on the fixed plate, the inside of the grinding rod is provided with a slag outlet hole along the axis, and the slag outlet hole is communicated with the slag inlet hole; a cavity is arranged in the fixed plate and is communicated with a slag hole of the grinding rod, a rectangular groove is arranged on the lower end surface of the fixed plate, and sliding grooves are arranged on the left side wall and the right side wall of the rectangular groove; the movable plate is horizontally arranged in the rectangular groove of the fixed plate, the left end and the right end of the movable plate are positioned in the sliding grooves, and the movable plate is hinged with the supporting plate; the second spring is positioned in the sliding groove, the upper end of the second spring is fixed at the top of the sliding groove, and the lower end of the second spring is connected with the movable plate; the air bag is arranged above the movable plate, is positioned in the rectangular groove of the fixed plate, is respectively connected with the fixed plate and the movable plate, is communicated with the cavity of the fixed plate through an air pipe and a filter box, and changes the volume by utilizing the up-and-down movement of the movable plate, so that the catalyst layer is pumped by the grinding rod, and the ground dust is pumped out; the filter box is used for filtering the extracted dust, and the dust is collected. When the telescopic link promoted the backup pad and makes grinding rod up-and-down motion, the fly leaf made the interior volume of gasbag change along the sliding tray up-and-down motion and produced the negative pressure to, the dust that makes the grinding in-process produce is taken out through the slag hole of grinding rod, and the dust of taking out filters through the filter box, has realized the automatic collection of dust.
And the mixing chamber is internally provided with stirring fan blades in the air outlet, and the stirring fan blades are used for further realizing the mixing of the air. When the slider moves rightwards, gas is compressed and enters the reaction chamber through the gas outlet, and in the process, the gas enables the stirring fan blades, so that the mixing effect is improved.
The invention has the following beneficial effects:
1. according to the bidirectional flow SCR denitration device, the gas suction module, the plugging module and the mixing module are matched with each other, waste gas to be treated and ammonia gas are sucked into the mixing chamber by using negative pressure, the gas is fully stirred and uniformly mixed in the suction process, the uniformly mixed gas is pressed into the reaction chamber for catalytic reduction reaction, and the reaction efficiency is high.
2. According to the bidirectional flow SCR denitration device, the grinding module is arranged to grind the catalyst so as to remove the failure part on the surface layer of the catalyst, and the utilization rate of the catalyst and the working efficiency of the device are improved.
3. According to the bidirectional flow SCR denitration device, the grinding module can form negative pressure by using the volume change of the air bag during grinding, and can timely extract ground dust, so that automatic cleaning is realized, the blockage of a catalyst is avoided, and the maintenance cost of the device is reduced.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is an enlarged view of a portion of the invention at B of FIG. 1;
FIG. 4 is a schematic view of the grinding rod of the present invention mounted on a connecting block;
in the figure: the device comprises a mixing chamber 1, an air suction module 2, a reaction chamber 3, a plugging module, a mixing module, a grinding module, a partition plate 11, a catalyst layer 7, a screw rod 21, a motor 22, a sliding block 23, a deflector rod 41, a roller 42, a plugging plate 43, a first gear 51, a second gear 52, an inner gear ring 53, a stirring blade 54, a grinding rod 61, a supporting plate 62, an expansion rod 63, a connecting block 8, a fixing plate 81, an air bag 82, a movable plate 83, a filter box 84 and stirring blades 9.
Detailed Description
The structure of a bidirectional flow SCR denitration device according to an embodiment of the present invention will be described below with reference to fig. 1 to 4.
As shown in fig. 1, the bidirectional flow SCR denitration device of the present invention includes a mixing chamber 1, an air suction module 2, a reaction chamber 3, a plugging module, a blending module, and a grinding module; a cavity structure is arranged in the mixing chamber 1, air inlets are formed in the bottom and the top of the mixing chamber 1 respectively and used for introducing ammonia gas and industrial waste gas, and a partition plate 11 is horizontally arranged in the mixing chamber 1; the number of the partition plates 11 is two, the partition plates 11 are arranged in the mixing chamber 1 from top to bottom, the cavity in the mixing chamber 1 is divided into an upper part, a middle part and a lower part by the two partition plates 11, vent holes are vertically formed in the partition plates 11, the right side wall of the cavity in the middle part of the mixing chamber 1 is provided with air outlet holes, and automatic valves are arranged at the positions of the air outlet holes of the mixing chamber 1; the air suction module 2 is positioned in the cavity in the middle part of the mixing chamber 1, and the air suction module 2 is used for sucking ammonia gas and industrial waste gas into the cavity in the middle part of the mixing chamber; the reaction chamber 3 is positioned on the right side of the mixing chamber 1, a cavity structure is arranged in the reaction chamber 3, the cavity of the reaction chamber 3 is communicated with the air outlet of the mixing chamber 1, at least two catalyst layers 7 are vertically arranged in the reaction chamber 3 at intervals, and the catalyst layers 7 are used for finishing SCR reaction; the plugging module is used for opening and closing the vent holes on the partition plate 11 through the movement of the air suction module 2; the mixing module is arranged on the air suction module 2 and is used for fully mixing the ammonia gas and the industrial waste gas entering the mixing chamber 1; the grinding module is positioned in the reaction chamber 3 and is used for grinding the catalyst in the catalyst layer 7 and removing the failed part of the catalyst surface layer; the air suction module 2 comprises a screw 21, a motor 22 and a slide block 23; the screw 21 is horizontally arranged in a cavity in the middle part of the mixing chamber 1; the sliding block 23 is installed on the screw rod 21 through threaded connection, the upper surface and the lower surface of the sliding block 23 are in contact with the partition plate 11, and the sliding block 23 can horizontally move along the screw rod 21; the motor 22 is arranged on the outer wall of the mixing chamber 1, and the output shaft of the motor 22 is connected with the screw 21. When the mixing device works, the motor 22 drives the screw rod 21 to rotate, and the sliding block 23 moves left and right in the mixing chamber 1.
As shown in fig. 1 and 3, the plugging module comprises a driving lever 41, a first spring, a roller 42 and a plugging plate 43; the sliding block 23 is provided with a sliding groove along the longitudinal direction on the end surface contacted with the partition board 11; the shift lever 41 is arranged in the sliding groove of the sliding block 23 through a first spring; grooves are arranged on the end face of the partition board 11, which is in contact with the sliding block 23, corresponding to the vent holes, the grooves of the partition board 11 are communicated with the vent holes, and the number of the grooves of the partition board 11 is the same as that of the vent holes; the roller 42 is vertically arranged in the groove of the sliding block 23, the roller 42 is provided with a torsion spring at the installation part, the outer circumferential surface of the roller 42 is provided with a tooth-shaped bulge, and the deflector rod 41 can be contacted with the tooth-shaped bulge on the surface of the roller 42, so that the rotation of the roller 42 is realized through the horizontal movement of the deflector rod 41; the blocking plate 43 is fixedly connected with the roller 42, the blocking plate 43 is located in the groove of the partition plate 11, and the blocking plate 43 is used for blocking the vent hole of the partition plate 11. When the motor 22 drives the screw rod 21 to rotate to enable the sliding block 23 to move leftwards, along with the movement of the sliding block 23, the deflector rod 41 deflects the rollers 42 at the position of the sliding block 23 one by one to enable the rollers 42 to rotate, the rollers 42 rotate to enable the blocking plate 43 to be opened, ammonia gas and industrial waste gas enter a cavity in the middle of the mixing chamber 1 through the air inlet, due to the existence of the torsion spring, the rollers 42 slowly rotate in the opposite direction, the blocking plate 43 blocks the air vent again, the sliding block 23 continuously moves leftwards, the air vent is gradually opened and slowly closed, and therefore the mixing chamber 1 is filled with mixed gas; then, the motor 22 rotates in the reverse direction, the slider 23 moves, and since the blocking plate 43 is in the closed state, the compressed air is discharged into the reaction chamber 3 through the air outlet hole to perform the catalytic reduction reaction.
As shown in fig. 1 and 2, the blending module comprises a first gear 51, a first bevel gear, a second gear 52, an inner gear ring 53 and a stirring blade 54; a tooth-shaped structure is arranged on the right end face of the shifting lever 41; the first gear 51 is arranged in the sliding block 23, and the first gear 51 is meshed with the shifting rod 41 through a tooth-shaped structure; the first bevel gear 51 and the first gear 51 are coaxially arranged, and the first bevel gear 51 is positioned in the sliding block 23; the second bevel gear 52 is meshed with the first bevel gear 51; the second gear 52 and the second bevel gear 52 are coaxially mounted, the second gear 52 is mounted on the sliding block 23, and the second gear 52 is located on the right side of the sliding block 23; the inner gear ring 53 is rotatably arranged on the right end surface of the sliding block 23, and the inner gear ring 53 is meshed with the second gear 52; the stirring blade 54 is fixed on the right end face of the inner gear ring 53, and the stirring blade 54 stirs and uniformly mixes the gas in the mixing chamber 1 along with the rotation of the inner gear ring 53. In the moving process of the sliding block 23, the shifting lever 41 moves up and down due to the contact with the gear, the shifting lever 41 moves to drive the gear I51 to rotate, the inner gear ring 53 on the right end face of the sliding block 23 rotates through the transmission of the bevel gear I51 and the bevel gear II 52, the rotation of the inner gear ring 53 drives the stirring blade 54 to continuously stir the ammonia gas and the industrial waste gas entering the mixing chamber 1, the uniform mixing of the gas is promoted, and the denitration efficiency is improved.
As shown in fig. 1, the grinding module comprises grinding rods 61, a support plate 62 and telescopic rods 63, the grinding rods 61 correspond to the number of the catalyst layers 7 in the reaction chamber 3, the grinding rods 61 penetrate into the catalyst layers 7 from the lower end of the reaction chamber 3, and the grinding rods 61 are used for grinding the catalyst; the supporting plate 62 is positioned at the lower end of the grinding rod 61, the grinding rod 61 is hinged with the supporting plate 62, and the middle part of the supporting plate 62 is hinged with the ground; the telescopic rod 63 is fixed on the ground, the upper end of the telescopic rod 63 is hinged with the support plate 62, and the hinged position of the telescopic rod 63 deviates from the center of the support plate 62. The catalyst in the catalyst layer 7 can lose efficacy on the surface in the process of carrying out the denitration reaction, has hindered the continuation use of the inside active ingredient of catalyst, and after the catalyst top layer became invalid, telescopic link 63 promoted backup pad 62 and made grinding rod 61 up-and-down motion in the catalyst layer 7, realized the grinding to the catalyst to the availability factor of catalyst has been improved.
As shown in fig. 4, the grinding rod 61 is connected to the supporting plate 62 through the connecting block 8; the connecting block 8 comprises a fixed plate 81, an air bag 82, a second spring, a movable plate 83, an air pipe and a filter box 84; the outer surface of the grinding rod 61 is provided with a spiral protrusion for improving the grinding effect, the spiral protrusion is provided with a slag inlet, the grinding rod 61 is rotatably mounted on the fixing plate 81, the inside of the grinding rod 61 is provided with a slag outlet along the axis, and the slag outlet is communicated with the slag inlet; a cavity is arranged in the fixed plate 81, the cavity of the fixed plate 81 is communicated with a slag hole of the grinding rod 61, a rectangular groove is arranged on the lower end face of the fixed plate 81, and sliding grooves are arranged on the left side wall and the right side wall of the rectangular groove; the movable plate 83 is horizontally arranged in the rectangular groove of the fixed plate 81, the left end and the right end of the movable plate 83 are positioned in the sliding grooves, and the movable plate 83 is hinged with the supporting plate 62; the second spring is positioned in the sliding groove, the upper end of the second spring is fixed at the top of the sliding groove, and the lower end of the second spring is connected with the movable plate 83; the air bag 82 is arranged above the movable plate 83, the air bag 82 is positioned in the rectangular groove of the fixed plate 81, the air bag 82 is respectively connected with the fixed plate 81 and the movable plate 83, the cavities of the air bag 82 and the fixed plate 81 are communicated through an air pipe and a filter box 84, the air bag 82 realizes volume change by utilizing the up-and-down movement of the movable plate 83, so that the catalyst layer 7 is pumped by the grinding rod 61, and ground dust is pumped out; the filter box 84 is used for filtering the extracted dust to collect the dust. When the telescopic rod 63 pushes the supporting plate 62 to move the grinding rod 61 up and down, the movable plate 83 moves up and down along the sliding groove to change the volume in the air bag 82 to generate negative pressure, so that dust generated in the grinding process is extracted through the slag hole of the grinding rod 61, and the extracted dust is filtered through the filter box 84, thereby realizing automatic collection of the dust.
As shown in fig. 1, the mixing chamber 1 is provided with a stirring blade 9 in the air outlet, and the stirring blade 9 is used for further mixing the air. When the slide block 23 moves rightwards, the gas is compressed and enters the reaction chamber 3 through the gas outlet, and in the process, the gas enables the stirring fan blades 9 to improve the mixing effect.
The specific working process is as follows:
when the mixing device works, the motor 22 drives the screw rod 21 to rotate, and the sliding block 23 moves left and right in the mixing chamber 1. When the motor 22 drives the screw rod 21 to rotate to enable the sliding block 23 to move leftwards, along with the movement of the sliding block 23, the deflector rod 41 deflects the rollers 42 at the position of the sliding block 23 one by one to enable the rollers 42 to rotate, the rollers 42 rotate to enable the blocking plate 43 to be opened, ammonia gas and industrial waste gas enter a cavity in the middle of the mixing chamber 1 through the air inlet, due to the existence of the torsion spring, the rollers 42 slowly rotate in the opposite direction, the blocking plate 43 blocks the air vent again, the sliding block 23 continuously moves leftwards, the air vent is gradually opened and slowly closed, and therefore the mixing chamber 1 is filled with mixed gas; then, the motor 22 rotates in the reverse direction, the slider 23 moves, and since the blocking plate 43 is in the closed state, the compressed air is discharged into the reaction chamber 3 through the air outlet hole to perform the catalytic reduction reaction.
In the moving process of the sliding block 23, the shifting lever 41 moves up and down due to the contact with the gear, the shifting lever 41 moves to drive the gear I51 to rotate, the inner gear ring 53 on the right end face of the sliding block 23 rotates through the transmission of the bevel gear I51 and the bevel gear II 52, the rotation of the inner gear ring 53 drives the stirring blade 54 to continuously stir the ammonia gas and the industrial waste gas entering the mixing chamber 1, the uniform mixing of the gas is promoted, and the denitration efficiency is improved.
The catalyst in the catalyst layer 7 can lose efficacy on the surface in the process of carrying out the denitration reaction, has hindered the continuation use of the inside active ingredient of catalyst, and after the catalyst top layer became invalid, telescopic link 63 promoted backup pad 62 and made grinding rod 61 up-and-down motion in the catalyst layer 7, realized the grinding to the catalyst to the availability factor of catalyst has been improved.
When the telescopic rod 63 pushes the supporting plate 62 to move the grinding rod 61 up and down, the movable plate 83 moves up and down along the sliding groove to change the volume in the air bag 82 to generate negative pressure, so that dust generated in the grinding process is extracted through the slag hole of the grinding rod 61, and the extracted dust is filtered through the filter box 84, thereby realizing automatic collection of the dust.
While one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.
(A) In the above embodiment, the screw is driven by the motor to move the slider left and right, but the present invention is not limited thereto, and the slider may move left and right by an air cylinder, a telescopic rod, or the like.
(B) In the above embodiment, the polishing rod is inserted into the catalyst layer from below the catalyst layer and polished, but the present invention is not limited thereto, and the polishing rod may be inserted into the catalyst layer from above the catalyst layer.
Industrial applicability
According to the present invention, the exhaust gas can be smoothly subjected to denitration treatment in the denitration device, and the denitration device is useful in the field of flue gas purification.
Claims (6)
1. A bidirectional flow SCR denitration device comprises a mixing chamber (1), an air suction module (2), a reaction chamber (3), a plugging module, a uniformly mixing module and a grinding module; a cavity structure is arranged in the mixing chamber (1), air inlets are formed in the bottom and the top of the mixing chamber (1) respectively and used for introducing ammonia gas and industrial waste gas, and a partition plate (11) is horizontally arranged in the mixing chamber (1); the mixing chamber is characterized in that the number of the partition plates (11) is two, the partition plates (11) are arranged in the mixing chamber (1) from top to bottom, the cavity in the mixing chamber (1) is divided into an upper part, a middle part and a lower part by the two partition plates (11), vent holes are vertically formed in the partition plates (11), air outlet holes are formed in the right side wall of the cavity in the middle of the mixing chamber (1), and automatic valves are arranged in the positions of the air outlet holes of the mixing chamber (1); the air suction module (2) is positioned in a cavity in the middle of the mixing chamber (1), and the air suction module (2) is used for sucking ammonia gas and industrial waste gas into the cavity in the middle of the mixing chamber; the reaction chamber (3) is positioned on the right side of the mixing chamber (1), a cavity structure is arranged in the reaction chamber (3), the cavity of the reaction chamber (3) is communicated with the air outlet of the mixing chamber (1), at least two catalyst layers (7) are vertically arranged in the reaction chamber (3) at intervals, and the catalyst layers (7) are used for finishing SCR reaction; the blocking module is used for realizing the opening and closing of the vent holes on the partition plate (11) through the movement of the air suction module (2); the mixing module is arranged on the air suction module (2) and is used for fully mixing the ammonia gas and the industrial waste gas entering the mixing chamber (1); the grinding module is positioned in the reaction chamber (3) and is used for grinding the catalyst in the catalyst layer (7) and removing the failed part of the catalyst surface layer; the method is characterized in that: the air suction module (2) comprises a screw rod (21), a motor (22) and a sliding block (23); the screw (21) is horizontally arranged in a cavity in the middle part of the mixing chamber (1); the sliding block (23) is installed on the screw rod (21) through threaded connection, the upper surface and the lower surface of the sliding block (23) are in contact with the partition plate (11), and the sliding block (23) can horizontally move along the screw rod (21); the motor (22) is arranged on the outer wall of the mixing chamber (1), and an output shaft of the motor (22) is connected with the screw (21).
2. The bi-directional flow SCR denitration device according to claim 1, wherein: the blocking module comprises a driving lever (41), a first spring, a roller (42) and a blocking plate (43); the sliding block (23) is provided with a sliding groove on the end surface contacted with the partition board (11) along the longitudinal direction; the shifting lever (41) is arranged in a sliding groove of the sliding block (23) through a first spring; grooves are formed in the end face, in contact with the sliding block (23), of the partition plate (11) and correspond to the vent holes, the grooves of the partition plate (11) are communicated with the vent holes, and the number of the grooves of the partition plate (11) is the same as that of the vent holes; the roller (42) is vertically arranged in a groove of the sliding block (23), a torsion spring is arranged at the installation part of the roller (42), a tooth-shaped bulge is arranged on the outer circumferential surface of the roller (42), and the deflector rod (41) can be in contact with the tooth-shaped bulge on the surface of the roller (42), so that the rotation of the roller (42) is realized through the horizontal movement of the deflector rod (41); the blocking plate (43) is fixedly connected with the roller (42), the blocking plate (43) is positioned in the groove of the partition plate (11), and the blocking plate (43) is used for blocking the vent hole of the partition plate (11).
3. The bi-directional flow SCR denitration device according to claim 2, wherein: the uniformly mixing module comprises a first gear (51), a first bevel gear, a second gear (52), an inner gear ring (53) and a stirring blade (54); a tooth-shaped structure is arranged on the right end face of the deflector rod (41); the first gear (51) is arranged in the sliding block (23), and the first gear (51) is meshed with the shifting rod (41) through a tooth-shaped structure; the first bevel gear and the first gear (51) are coaxially arranged, and the first bevel gear is positioned in the sliding block (23); the second bevel gear is meshed with the first bevel gear; the second gear (52) and the second bevel gear are coaxially mounted, the second gear (52) is mounted on the sliding block (23), and the second gear (52) is located on the right side of the sliding block (23); the inner gear ring (53) is rotatably arranged on the right end surface of the sliding block (23), and the inner gear ring (53) is meshed with the second gear (52); the stirring blade (54) is fixed on the right end face of the inner gear ring (53), and the stirring blade (54) stirs and uniformly mixes the gas in the mixing chamber (1) along with the rotation of the inner gear ring (53).
4. The bi-directional flow SCR denitration device according to claim 1, wherein: the grinding module comprises grinding rods (61), a support plate (62) and telescopic rods (63), the number of the grinding rods (61) corresponds to that of the catalyst layers (7) in the reaction chamber (3), the grinding rods (61) penetrate into the catalyst layers (7) from the lower end of the reaction chamber (3), and the grinding rods (61) are used for grinding the catalyst; the supporting plate (62) is positioned at the lower end of the grinding rod (61), the grinding rod (61) is hinged with the supporting plate (62), and the middle part of the supporting plate (62) is hinged to the ground; the telescopic rod (63) is fixed on the ground, the upper end of the telescopic rod (63) is hinged to the support plate (62), and the hinged position of the telescopic rod (63) deviates from the center of the support plate (62).
5. The bi-directional flow SCR denitration device of claim 4, wherein: the grinding rod (61) is connected with the supporting plate (62) through a connecting block (8); the connecting block (8) comprises a fixed plate (81), an air bag (82), a second spring, a movable plate (83), an air pipe and a filter box (84); the outer surface of the grinding rod (61) is provided with a spiral protrusion for improving the grinding effect, the spiral protrusion is provided with a slag inlet, the grinding rod (61) is rotatably arranged on the fixing plate (81), the inside of the grinding rod (61) is provided with a slag outlet along the axis, and the slag outlet is communicated with the slag inlet; a cavity is arranged in the fixed plate (81), the cavity of the fixed plate (81) is communicated with a slag hole of the grinding rod (61), a rectangular groove is arranged on the lower end face of the fixed plate (81), and sliding grooves are arranged on the left side wall and the right side wall of the rectangular groove; the movable plate (83) is horizontally arranged in the rectangular groove of the fixed plate (81), the left end and the right end of the movable plate (83) are positioned in the sliding grooves, and the movable plate (83) is hinged with the supporting plate (62); the second spring is positioned in the sliding groove, the upper end of the second spring is fixed at the top of the sliding groove, and the lower end of the second spring is connected with the movable plate (83); the air bag (82) is arranged above the movable plate (83), the air bag (82) is positioned in a rectangular groove of the fixed plate (81), the air bag (82) is respectively connected with the fixed plate (81) and the movable plate (83), cavities of the air bag (82) and the fixed plate (81) are communicated through an air pipe and a filter box (84), and the air bag (82) realizes volume change by utilizing the up-and-down movement of the movable plate (83), so that the catalyst layer (7) is pumped through the grinding rod (61), and ground dust is pumped out; the filter box (84) is used for filtering the extracted dust to collect the dust.
6. The bi-directional flow SCR denitration device according to claim 1, wherein: mixing chamber (1) installs stirring fan blade (9) in the outlet port, and stirring fan blade (9) are used for further realizing gaseous mixture.
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