SCR denitration flue gas device for coal-fired power plant

Abstract

An SCR denitration flue gas device for a coal-fired power plant, comprising a denitration reaction device (3). The denitration reaction device (3) comprises: a box body (318), wherein the box body (318) is fixed on a bottom plate (11), a first cavity (31) and a second cavity (32) which are distributed up and down and are communicated with each other are arranged in the box body (318), a filter barrel (315) is arranged in the second cavity (32), a catalyst cavity (33) is further arranged below the second cavity (32) in the box body (318), a gas inlet of the first cavity (31) is connected to a first flue (13), the first flue (13) is connected to a smoke exhaust channel of a boiler (1), a second flue (14) is arranged at a gas outlet in the lower portion of the box body (318), and a first-layer catalyst (326), a second-layer catalyst (327) and a third-layer catalyst (328) are arranged in the catalyst cavity (33) at intervals up and down; and three groups of blocking plate structures, which are respectively arranged above the first-layer catalyst (326), between the second-layer catalyst (327) and the first-layer catalyst (326), and between the third-layer catalyst (328) and the second-layer catalyst (327). By periodically adjusting the opening degree and direction of the blocking plates, long-time flue gas scouring and local blockage of individual positions of catalysts are prevented.

Description

An SCR denitrification flue gas device for coal-fired power plants Technical Field

[0001] The present invention relates to the technical field of flue gas denitrification, and in particular to an SCR flue gas denitrification device for a coal-fired power plant. Background Art

[0002] Since 2010, thermal power plants have been vigorously promoting boiler denitrification technology, achieving full coverage by 2013. Both in-furnace and off-furnace denitrification technologies have been widely promoted and applied, and are operating well. Selective catalytic reduction (SCR) denitrification technology is particularly widely used. Denitrification equipment in typical power plant units is located between the economizer and preheater. Each boiler is equipped with two SCR reactors, with catalyst layers arranged in a 2+1 (future layer) configuration. Most are honeycomb (or plate) type, with a continuous operating flue gas temperature of 300-420°C. The designed flue gas velocity in the catalyst area is 5-6 m / s, and the maximum ammonia injection rate per boiler is designed to be 190 kg / h, resulting in a denitrification efficiency of 80%.

[0003] Existing SCR flue gas denitrification devices, such as CN214437946U, an SCR flue gas denitrification device using selective catalyst reduction, have the following problems:

[0004] 1. There is a lack of a filter for the flue gas before it enters the catalyst, which makes it easy for the catalyst to be clogged by large particles of impurities in the flue gas;

[0005] 2. The size of the flue gas inlet between different layers of catalyst in the reduction chamber cannot be adjusted, which is not convenient for meeting different usage requirements. Summary of the Invention

[0006] The present invention provides an SCR flue gas denitrification device for a coal-fired power plant, which is used to solve at least one of the technical problems raised by the above background technology.

[0007] In order to solve the above technical problems, the present invention discloses an SCR denitrification flue gas device for a coal-fired power plant, comprising a denitrification reaction device, the denitrification reaction device comprising:

[0008] The box body is fixed to the bottom plate, and a first chamber and a second chamber are arranged in the box body, which are distributed up and down and communicate with each other. A filter barrel is provided in the second chamber. A catalyst chamber is also provided in the box body below the second chamber. The air inlet of the first chamber is connected to the flue 1, and the flue 1 is connected to the exhaust channel of the boiler. The air outlet at the lower part of the box body is provided with the flue 2. A first layer of catalyst, a second layer of catalyst, and a third layer of catalyst are arranged in intervals up and down in the catalyst chamber.

[0009] The three baffle structures are respectively arranged above the first layer of catalyst, between the second layer of catalyst and the first layer of catalyst, and between the third layer of catalyst and the second layer of catalyst.

[0010] Preferably, the outer side of the lower end of the filter barrel is sloped, and the denitrification reaction device further comprises:

[0011] Rotating body, the outer side of the lower end of the filter barrel is in contact with a plurality of rotating bodies, the rotating body is rotatably connected to a fixed block fixed to the inner wall of the box, the lower side of the filter barrel is provided with a filter hole, the outer side of the upper part of the filter barrel is sleeved with a second gear, and the second gear is meshed with the first gear for transmission;

[0012] The second rotating shaft is vertically arranged, the lower end of the second rotating shaft is connected to the output shaft of the first motor, the middle of the second rotating shaft is fixedly sleeved with the first gear, and the first motor is arranged outside the box;

[0013] A plurality of conical blocks are arranged at intervals along the outer side of the upper end of the filter barrel, and a first spring is connected between the conical blocks and the inner wall of the second chamber.

[0014] Preferably, the denitration reaction device further comprises:

[0015] The first rotating shaft, the left end of the first rotating shaft is rotatably connected to the upper part of the left inner wall of the first chamber, the right end of the first rotating shaft rotates and passes through the box body, the right end of the first rotating shaft is connected to the first bevel gear, the first bevel gear is meshed with the second bevel gear for transmission, a number of third bevel gears are connected through the middle of the first rotating shaft, the third bevel gears are meshed with the corresponding number of fourth bevel gears for transmission, the fourth bevel gear is connected to the third rotating shaft, the third rotating shaft rotates and passes through the fixed frame, the left and right ends of the fixed frame are fixed on the inside of the first chamber, the third rotating shaft is connected to the fan, and the upper end of the second rotating shaft is connected to the second bevel gear.

[0016] Preferably, it also includes:

[0017] The solution pipeline is connected to a liquid storage tank above the solution pipeline, and the liquid storage tank is fixed above the box body. The middle of the solution pipeline passes through the upper wall of the box body, and the bottom of the solution pipeline passes through the fixed frame. Several nozzles are connected to the inner side of the filter barrel at intervals, and the nozzles are connected to the solution pipeline.

[0018] Preferably, the outer shells are symmetrically fixed on both sides of the box body; and the baffle structure includes two groups of left-right symmetrical baffle assemblies.

[0019] Preferably, the baffle assembly on the left side includes: a first baffle, which passes through the left outer wall of the box body, a first rack is provided below the outer side of the first baffle, the first rack is engaged with the third gear for transmission, the first rack and the third gear are both located in the corresponding outer shell, and the third gear is driven by the drive motor in the outer shell.

[0020] Preferably, the first layer of catalyst, the second layer of catalyst, and the third layer of catalyst are respectively connected to a group of auxiliary devices, and the auxiliary devices connected to the first layer of catalyst include:

[0021] Two fourth rotating shafts are rotatably connected to the left and right sides of the catalyst chamber respectively. The second motor is fixed to the outer wall of the housing on the right side. The output shaft of the second motor is fixedly connected to the third rotating shaft on the right side. The two fourth rotating shafts are connected to symmetrically arranged mounting devices on the sides close to each other. The first layer of catalyst is installed between the two sets of mounting devices. The two fourth rotating shafts are respectively provided with external threaded portions with opposite rotation directions.

[0022] Two left-right symmetrical L-shaped rods, the upper or lower part of the L-shaped rod is connected to the corresponding external threaded part, a flow channel is set inside the L-shaped rod, and several exhaust ports are set on the side close to the first layer of catalyst at one end of the L-shaped rod close to the box body. The exhaust ports are connected to the flow channel, and the air inlet of the flow channel is connected to the pressurized gas inlet pipe.

[0023] Preferably, the mounting device on the right side includes:

[0024] A housing fixed to the left end of the fourth rotating shaft on the right side, the left side of the housing being open and provided with a fixing frame, the fixing frame being provided with a mounting hole for inserting the right portion of the first layer of catalyst;

[0025] The limit frame is composed of two horizontal sections spaced apart from each other and a vertical section, the vertical section is fixedly connected to the right side between the two horizontal sections, the limit frame is located inside the shell, the horizontal section passes through the left wall of the shell, a first conical block is arranged on the right side of the vertical section, a first conical surface with a higher left and a lower right side is arranged on the right side of the first conical block, the upper end of the first conical block contacts the arc-shaped contact surface of the lower end of the limit rod, and the limit rod is threadedly connected and passes through the upper wall of the shell; a second conical block is symmetrically arranged on the side close to each other of the two horizontal sections, and a second conical surface with a higher left and a lower right side is arranged on the left side of the second conical block on the upper side; a fixed block is arranged on the left side of the vertical section, a through hole for the fixed block to pass through is arranged on the right side of the fixed frame, and a first mounting hole for connecting with the fixed block is arranged on the right part of the first layer of catalyst;

[0026] A plurality of second limiting rods correspond one to one with a plurality of second conical blocks. The second limiting rods pass through the fixed frame from top to bottom. The contact balls on the outer sides of the second limiting rods contact the second conical surface of the second conical block. The inner sides of the second limiting rods contact the first layer of catalyst. A second spring is provided between the contact balls and the upper and lower outer walls of the fixed frame.

[0027] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] FIG1 is a schematic structural diagram of the present invention;

[0030] FIG2 is a partial enlarged view of point A in FIG1 ;

[0031] FIG3 is a partial enlarged view of point B in FIG1 ;

[0032] FIG4 is a top view of the filter barrel of the present invention;

[0033] FIG5 is a schematic diagram of the structure of the installation device in the present invention.

[0034] In the figure: 1. Boiler; 11. Bottom plate; 12. Support base; 13. Flue 1; 14. Flue 2; 2. Economizer; 3. Denitration reaction device; 31. First chamber; 32. Second chamber; 33. Catalyst chamber; 34. Third bevel gear; 35. First rotating shaft; 36. Fourth bevel gear; 37. Fan; 38. Third rotating shaft; 39. First bevel gear; 310. Second bevel gear; 311. Second rotating shaft; 312. First gear; 313. Second gear; 314. First motor; 315. Filter barrel; 316. First spring; 317. Conical block; 318. Box; 319. Filter hole; 320. Fixed block; 321. Rotating body; 322. Third gear; 323. First rack; 324. 4. First baffle; 325. Housing; 326. First layer of catalyst; 327. Second layer of catalyst; 328. Third layer of catalyst; 329. Fixing frame; 330. Liquid storage tank; 331. Solution pipeline; 332. Second motor; 333. Fourth rotating shaft; 334. L-shaped rod; 4. Mounting device; 41. Housing; 42. Limiting rod; 43. First conical block; 44. Limiting frame; 441. Horizontal section; 442. Vertical section; 45. Fixing block; 46. Second limiting rod; 47. Second spring; 48. Second conical block; 49. Fixing frame; 410. Contact ball; 5. Air preheater. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The present invention provides the following embodiments Example 1

[0038] An embodiment of the present invention provides an SCR flue gas denitrification device for a coal-fired power plant, as shown in FIG1 to FIG4 , including a denitrification reaction device 3, which includes:

[0039] The box body 318 is fixed on the bottom plate 11, and a first chamber 31 and a second chamber 32 are arranged in the box body 318, which are distributed up and down and connected to each other. A filter barrel 315 is provided in the second chamber 32. A catalyst chamber 33 is also provided below the second chamber 32 in the box body 318. The air inlet of the first chamber 31 is connected to the flue 13, and the flue 13 is connected to the exhaust channel of the boiler 1. The air outlet at the lower part of the box body 318 is provided with the flue 2 14.

[0040] Preferably, a plurality of support seats 12 are provided below the bottom plate 11 .

[0041] Preferably, the outer side of the lower end of the filter barrel 315 is sloped, and the denitration reaction device 3 further includes:

[0042] Rotating bodies 321 are in contact with the outer side of the lower end of the filter barrel 315. The rotating bodies 321 are rotatably connected to a fixed block 320 fixed to the inner wall of the box body 318. The lower side of the filter barrel 315 is provided with a filter hole 319. The upper outer side of the filter barrel 315 is sleeved with a second gear 313, which is meshed with the first gear 312 for transmission.

[0043] The second rotating shaft 311 is vertically arranged. The lower end of the second rotating shaft 311 is connected to the output shaft of the first motor 314. The middle of the second rotating shaft 311 is fixedly sleeved with the first gear 312. The first motor 314 is arranged outside the box 318.

[0044] A plurality of conical blocks 317 are arranged at intervals along the outer side of the upper end of the filter barrel 315 , and a first spring 316 is connected between the conical blocks 317 and the inner wall of the second chamber 32 .

[0045] Preferably, the denitration reaction device 3 further includes:

[0046] The first rotating shaft 35, the left end of the first rotating shaft 35 is rotatably connected to the upper part of the left inner wall of the first chamber 31, the right end of the first rotating shaft 35 rotates and passes through the box body 318, the right end of the first rotating shaft 35 is connected to the first bevel gear 39, the first bevel gear 39 is engaged with the second bevel gear 310 for transmission, the middle of the first rotating shaft 35 is connected with a number of third bevel gears 34, the third bevel gears 34 are engaged with the corresponding number of fourth bevel gears 36 for transmission, the fourth bevel gear 36 is connected to the third rotating shaft 38, the third rotating shaft 38 rotates and passes through the fixed frame 329, the left and right ends of the fixed frame 329 are fixed on the inner side of the first chamber 31, the third rotating shaft 38 is connected to the fan 37, and the upper end of the second rotating shaft 311 is connected to the second bevel gear 310.

[0047] Preferably, it also includes:

[0048] The solution pipeline 331 is connected to the liquid storage tank 330 above the solution pipeline 331, and the liquid storage tank 330 is fixed above the box body 318. The middle of the solution pipeline 331 passes through the upper wall of the box body 318, and the bottom of the solution pipeline 331 passes through the fixing frame 329. A plurality of nozzles are connected to the inner circumference of the filter barrel 315 at intervals, and the nozzles are connected to the solution pipeline 331.

[0049] Preferably, flue 2 14 is connected to the air preheater 5 , and flue 1 13 is connected to the economizer 2 .

[0050] Among them, the fan 37 can be an existing induced draft fan;

[0051] The beneficial effects of the above technical solution are as follows: in the present invention, the flue gas in the boiler 1 enters the first chamber 31 of the denitrification reaction device 3 along the flue 13, and at this time the first motor 314 is turned on, and the second bevel gear 310 sleeved with the second rotating shaft 311 starts to rotate, and the first bevel gear 39 meshing therewith also starts to rotate with the first rotating shaft 35, and since the third bevel gear 34 is connected to the first rotating shaft 35, the fourth bevel gear 36 meshing with the third bevel gear 34 starts to drive the fan 37 to rotate, and at this time the rotation of the fan 37 can control the flue gas flow rate in the flue; the reaction liquid (which can be ammonia water) in the liquid storage tank 330 passes through the solution pipe 331 and the nozzle into the filter barrel 315, and after mixing with the flue gas in the filter barrel 315, it passes through the three-layer catalyst reaction in the catalyst chamber 33, and finally Then the reaction-completed gas is discharged from the flue 2 14; since the first gear 312 is sleeved on the second rotating shaft 311, when the second rotating shaft 311 rotates, the second gear 313 engaged with the first gear 312 also starts to rotate, and the filter barrel 315 also starts to rotate, thereby effectively controlling the range of the nozzle spraying the reaction liquid (such as ammonia water); the outer side of the lower end of the filter barrel 315 is sloped, and the outer side of the lower end of the filter barrel 315 is in contact with a number of rotating bodies 321, which can effectively reduce the friction force when the filter barrel 315 rotates. The outer side of the upper end of the filter barrel 315 is also provided with a number of conical blocks 317, which can effectively prevent the filter barrel 315 from coming out from the top when rotating and facilitate the replacement of the filter barrel 315; and first, large particles of impurities are filtered through the filter barrel 315 to prevent large particles of impurities from clogging the catalyst.

[0052] The present invention prevents prolonged flue gas scouring and local blockage of individual positions of the catalyst by regularly adjusting the opening direction of the baffle.

[0053] The present invention solves the following problems raised in the background art: existing SCR flue gas denitrification devices, such as CN214437946U, an SCR flue gas denitrification device using selective catalyst reduction, have the following problems: 1. There is a lack of a flue gas filtering device before the flue gas enters the catalyst, which makes it easy for large particles of impurities in the flue gas to clog the catalyst; 2. The size of the flue gas inlet between different layers of catalyst in the reduction chamber cannot be adjusted, which is not convenient for meeting different usage requirements (this problem is solved by setting a baffle and adjusting the baffle opening).

[0054] The present invention also has the following effects: improving the flow field uniformity of the SCR reactor:

[0055] 1) Eliminate uneven flue gas flow field;

[0056] 2) Less local dust accumulation, damage, and collapse of the catalyst

[0057] 3) By increasing the flue gas velocity in the catalyst pores, the conversion rate of SO2 oxidation to SO3 is reduced.

[0058] 4) Through throttling adjustment, the induced draft fan is effectively prevented from stalling, surging and other problems during low load periods, thereby improving the safety and reliability of the equipment.

[0059] Example 2, based on Example 1, as shown in FIG1 , the housing 325 is symmetrically fixed on both sides of the box 318;

[0060] The catalyst chamber 33 is provided with a first layer of catalyst 326, a second layer of catalyst 327, and a third layer of catalyst 328 spaced apart from each other.

[0061] The three groups of baffle structures are respectively arranged above the first layer of catalyst 326 , between the second layer of catalyst 327 and the first layer of catalyst 326 , and between the third layer of catalyst 328 and the second layer of catalyst 327 .

[0062] Preferably, the baffle structure includes two groups of left-right symmetrical baffle assemblies, and the baffle assembly on the left side includes: a first baffle 324, which passes through the left outer wall of the box body 318, and a first rack 323 is provided at the lower outer side of the first baffle 324. The first rack 323 is engaged with the third gear 322 for transmission. The first rack 323 and the third gear 322 are both located in the corresponding outer shell 325, and the third gear 322 is driven by the drive motor in the outer shell 325.

[0063] The beneficial effects of the above technical solution are:

[0064] When the reaction liquid and flue gas enter the catalyst chamber 33, this invention has three catalyst layers, and a baffle is provided above each catalyst layer. When the load is 100%, the third gear 322 is controlled to rotate, and the first rack 323 engaged with it starts to rotate. At this time, all the baffles are opened. As the load decreases, especially during the period from 70% to the minimum load, the baffle opening is adjusted to make the designed flue gas flow rate in the catalyst area 5 to 6 m / s, and the fan runs at a safe speed, so that part of the catalyst works normally and the remaining part is in hot standby state. By regularly adjusting the direction of the baffle opening, long-term flue gas scouring and local blockage at individual positions of the catalyst are prevented. Example 3

[0065] Based on Example 2, as shown in FIG1 and FIG5 , the first layer catalyst 326, the second layer catalyst 327, and the third layer catalyst 328 are respectively connected to a group of auxiliary devices. The auxiliary devices connected to the first layer catalyst 326 include:

[0066] Two fourth rotating shafts 333 are rotatably connected to the left and right sides of the catalyst chamber 33, respectively. The second motor 332 is fixed to the outer wall of the housing 325 on the right side. The output shaft of the second motor 332 is fixedly connected to the fourth rotating shaft 333 on the right side. The two fourth rotating shafts 333 are connected to symmetrically arranged mounting devices 4 on the sides close to each other. The first layer of catalyst 326 is installed between the two sets of mounting devices 4. The two fourth rotating shafts 333 are respectively provided with external threads with opposite rotation directions.

[0067] Two left-right symmetrical L-shaped rods 334 are provided, and the upper or lower part of the L-shaped rod 334 is connected to the corresponding external threaded part. A flow channel is set inside the L-shaped rod 334. A plurality of exhaust ports are set on the side of the end of the L-shaped rod 334 close to the first layer of catalyst 326 near the inside of the box body 318. The exhaust ports are connected to the flow channel, and the air inlet of the flow channel is connected to the pressurized gas inlet pipe.

[0068] Preferably, the mounting device 4 on the right side includes:

[0069] The housing 41 is fixed to the left end of the fourth rotating shaft 333 on the right side. The left side of the housing 41 is open and is provided with a fixing frame 49. The fixing frame 49 is provided with a mounting hole for inserting the right part of the first layer catalyst 326;

[0070] The limiting frame 44 is composed of two horizontal sections 441 spaced apart from each other and a vertical section 442. The vertical section 442 is fixedly connected to the right side between the two horizontal sections 441. The limiting frame 44 is located in the shell 41. The horizontal section 441 passes through the left wall of the shell 41. A first conical block 43 is provided on the right side of the vertical section 442. A first conical surface with a higher left and a lower right side is provided on the right side of the first conical block 43. The upper end of the first conical block 43 contacts the arc-shaped contact surface of the lower end of the limiting rod 42. The limiting rod 42 is threadedly connected and passes through the upper wall of the shell 41; a second conical block 48 is symmetrically provided on the side close to each other of the two horizontal sections 441, and a second conical surface with a higher left and a lower right side is provided on the left side of the second conical block 48 on the upper side; a fixed block 45 is provided on the left side of the vertical section 442, and a through hole for the fixed block 45 to pass through is provided on the right side of the fixing frame 49. A first mounting hole for connecting with the fixed block 45 is provided on the right side of the first layer of catalyst 326;

[0071] A plurality of second limiting rods 46 correspond one to one with a plurality of second conical blocks 48. The second limiting rods 46 pass through the fixing frame 69 from top to bottom. The contact ball 410 on the outside of the second limiting rod 46 contacts the second conical surface of the second conical block 48. The inside of the second limiting rod 46 contacts the first layer of catalyst 326. A second spring 47 is provided between the contact ball 410 and the upper and lower outer walls of the fixing frame 49.

[0072] Among them, dust suction pipes are respectively provided above the first layer of catalyst 326, between the second layer of catalyst 327 and the first layer of catalyst 326, and between the third layer of catalyst 328 and the second layer of catalyst 327, and the dust suction pipes are connected to the dust suction device; in the present invention, flushing pipes and drying devices can also be provided above the first layer of catalyst 326, between the second layer of catalyst 327 and the first layer of catalyst 326, and between the third layer of catalyst 328 and the second layer of catalyst 327, so as to achieve cleaning and drying of the corresponding catalysts;

[0073] Among them, the flue 13 can be provided with a valve;

[0074] The beneficial effects of the above technical solution are:

[0075] 1. In the present invention, the catalysts (first layer catalyst 326, second layer catalyst 327, and third layer catalyst 328) are mounted on corresponding mounting devices. When the second motor 332 is turned on, the fourth rotating shaft 333 rotates, driving the catalysts to rotate, thereby adjusting the positions of the catalysts.

[0076] 2. When a catalyst is clogged, the corresponding first baffle 324 is closed (for example, to remove dust from the first layer of catalyst 326, the two first baffles of the first layer are controlled to contact and seal each other) to avoid affecting other catalysts, and then dust removal is started;

[0077] 3. During dust removal, when the corresponding second motor 332 is controlled, the fourth rotating shaft 333 rotates to drive the catalyst to rotate. For example, based on FIG1 , the counterclockwise rotation is carried out, and at the same time, the left and right movement of the L-shaped rod 334 is coordinated, so that high-pressure dust removal can be performed on the catalyst surface through the exhaust hole of the L-shaped rod 334. By rotating the fourth rotating shaft 333 to drive the catalyst to rotate, on the one hand, the effective range of the exhaust hole can be adjusted, and on the other hand, the catalyst can be adjusted to a certain angle to facilitate the discharge of dust from the catalyst. Finally, dust is sucked through the dust suction pipe to achieve cleaning of the catalyst, which can achieve online cleaning of the catalyst.

[0078] When dust removal is not in progress, the exhaust holes of the L-shaped rod 334 are all sealed inside the housing to prevent smoke from entering.

[0079] 4. In the installation device, when the catalyst needs to be installed, the left and right parts of the catalyst are installed into the installation holes of the corresponding installation devices, and then the limit rods 42 on the left and right sides are controlled to work. Take the limit rod 42 on the right side as an example: rotate the limit rod 42 to move the limit rod 42 downward, and the first conical block 43 is squeezed. In the process of the limit rod 42 pressing down, the limit frame 44 starts to move to the left. On the one hand, since the upper and lower inner walls of the limit frame 44 are provided with second conical blocks 48, the second conical block 48 moves to the left, squeezing the upper and lower second limit rods 46 to move inward, thereby achieving the upper and lower ends of the right part of the catalyst. Clamped state; on the other hand, since the fixed block 45 is set on the inner side of the vertical section 442 of the limit frame 44, when the limit frame 44 starts to move to the left, the fixed block 45 will squeeze the catalyst to the left, and finally the left and right fixed blocks 45 clamp the left and right sides of the catalyst again, so that the catalyst is well clamped (through the left and right clamping of the fixed block 45, and multiple groups of upper and lower clamping on the left and right parts), which is also beneficial for the catalyst not to fall off easily during the rotation process. The present invention only needs to control the limit rod 42 to achieve the clamping of the catalyst, and the catalyst can be effectively and conveniently installed and disassembled, eliminating the complicated procedures of the staff.

[0080] Example 4, based on any one of Examples 1-3, further includes:

[0081] A rotation speed detection device, used to detect the rotation speed of the filter barrel;

[0082] A first flow detection device is used to detect the air flow at the smoke inlet of the box 318;

[0083] A second flow detection device is used to detect the flow at the nozzle outlet; wherein the nozzle is an atomizing nozzle;

[0084] The second density detection device is used to detect the air density at the smoke inlet of the box 318;

[0085] A first temperature detection device is used to detect the temperature of the fluid at the nozzle outlet;

[0086] A first density detection device, used to detect the density of the liquid in the solution pipe 331;

[0087] The second temperature detection device is used to detect the temperature of the flue gas at the flue gas inlet of the box 318;

[0088] A control device, an alarm 1, and an alarm 2, wherein the control device is electrically connected to the speed detection device, the first flow detection device, the second flow detection device, the second density detection device, the first temperature detection device, the first density detection device, the second temperature detection device, the alarm 1, and the alarm 2 respectively. The control device controls the operation of the alarm 1 and the alarm 2 based on the speed detection device, the first flow detection device, the second flow detection device, the second density detection device, the first temperature detection device, the first density detection device, and the second temperature detection device, including:

[0089] The current mixing state coefficient is periodically calculated based on the rotation speed detection device, the first flow detection device, the second flow detection device, the second density detection device, the first density detection device, the first temperature detection device, and the second temperature detection device. When the mixing state coefficient is not within the corresponding first preset range, the control device controls the alarm to sound an alarm, and the control device adjusts at least one operation of the motor 314 and the atomizing nozzle according to the current mixing state coefficient so that the adjusted mixing state coefficient is within the corresponding first preset range.

[0090] ;

[0091] P is the current mixing state coefficient, N is the total number of nozzles spaced apart along the circumference of the filter barrel, e is a natural constant (valued at 2.72), n is the detection value of the speed detection device, n0 is the unit speed, A is the Boltzmann constant, T1 is the detection value of the first temperature detection device, T2 is the detection value of the second temperature detection device, ρ1 is the detection value of the first density detection device, π is 3.14, R is the atomized particle size of the atomizing nozzle, ρ2 is the detection value of the second density detection device, and m is the unit mass; Q1 is the detection value of the first flow detection device, and Q2 is the detection value of the second flow detection device;

[0092] The actual detection value of each detection device detected in the first cycle is used as the preset reference value, and the number of times the alarm is sounded by the alarm device 1 within a certain time period, as well as the mixed state coefficient at each alarm and the degree of change of each detection device at each alarm are obtained. When the degree of change of the detection device is greater than the corresponding preset range, the alarm device 2 alarms and determines that the corresponding detection device is an abnormal change detection device. The adjustment strategy for the entire device is determined according to the abnormality of the abnormal change detection device (for example, the detection device with a large abnormality is repaired and adjusted).

[0093] ;

[0094] ;

[0095] S ji B is the change degree of the i-th detection device during the j-th alarm; jiB is the actual detection value of the i-th detection device during the j-th alarm; j0 is the preset reference value of the i-th detection device, S i is the maximum allowable variation of the i-th detection device; H i is the abnormality of the i-th detection device; E i is the number of times that the degree of change of the i-th detection device is greater than the corresponding preset threshold within a certain time period, and G is the number of times the alarm is sounded within a certain time period.

[0096] The beneficial effects of the above technical solution are:

[0097] 1. By obtaining the air parameters (flow rate, temperature, density) at the flue gas inlet of the measuring box 318, the parameters (flow rate, temperature, density) of the atomized reaction liquid, the number of nozzles, and the rotation speed of the filter barrel, the real-time air parameter status at the flue gas inlet of the measuring box 318 and the mixing state of the flue gas and reaction liquid under the parameter status of the atomized reaction liquid are obtained. When the mixing state is abnormal, the alarm is promptly controlled to sound an alarm, and the operation of the atomizing nozzle and the first motor 314 (the valve operation can also be adjusted) is automatically adjusted to ensure that the mixing state of the reaction liquid is in an appropriate state, ensure the mixing effect, and facilitate the subsequent denitrification effect.

[0098] 2. Using the actual detection values ​​of each detection device during the first cycle as the preset baseline value, obtain the number of times Alarm 1 sounds within a certain time period, as well as the mixed state coefficient and the degree of change of each detection device during each alarm. When the degree of change of a detection device exceeds the corresponding preset threshold, Alarm 2 sounds, and the corresponding alarm device is determined to be an abnormal change detection device. Based on the abnormality of the abnormal change detection device, an adjustment strategy for the entire device is determined (e.g., if the abnormality of the second flow detection device is too large, adjust the corresponding nozzle and inspect the corresponding nozzle (the nozzle atomization state is abnormal)). This allows the dynamic change status of each detection device to be obtained within a certain period of time, making it easier to adjust the corresponding parameters of each detection device based on the dynamic change status of each detection device to ensure the denitrification effect.

[0099] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A SCR denitrification flue gas device for a coal-fired power plant, characterized in that: The invention comprises a denitration reaction device (3), wherein the denitration reaction device (3) comprises: A box body (318), the box body (318) is fixed on the bottom plate (11), a first chamber (31) and a second chamber (32) are arranged in the box body (318), the first chamber (31) and the second chamber (32) are arranged in the box body (318), a filter barrel (315) is arranged in the second chamber (32), a catalyst chamber (33) is arranged below the second chamber (32) in the box body (318), an air inlet of the first chamber (31) is connected to a flue 1 (13), the flue 1 (13) is connected to a smoke exhaust channel of the boiler (1), a flue 2 (14) is arranged at the air outlet at the bottom of the box body (318), and a first layer of catalyst (326), a second layer of catalyst (327), and a third layer of catalyst (328) are arranged in the catalyst chamber (33) at intervals in the upper and lower parts; The three groups of baffle structures are respectively arranged above the first layer of catalyst (326), between the second layer of catalyst (327) and the first layer of catalyst (326), and between the third layer of catalyst (328) and the second layer of catalyst (327).

2. The SCR denitrification flue gas device for a coal-fired power plant according to claim 1, characterized in that: The outer side of the lower end of the filter barrel (315) is sloped. The denitration reaction device (3) also includes: Rotating bodies (321), the outer side of the lower end of the filter barrel (315) contacts with a plurality of rotating bodies (321), the rotating bodies (321) are rotatably connected to a fixing block (320) fixed to the inner wall of the box body (318), a filtering hole (319) is provided on the lower side of the filter barrel (315), the outer side of the upper part of the filter barrel (315) is sleeved with a second gear (313), and the second gear (313) is meshed with the first gear (312) for transmission; The second rotating shaft (311) is vertically arranged, the lower end of the second rotating shaft (311) is connected to the output shaft of the first motor (314), the middle of the second rotating shaft (311) is fixedly sleeved with the first gear (312), and the first motor (314) is arranged outside the box (318); A plurality of conical blocks (317) are arranged at intervals along the outer side of the upper end of the filter barrel (315), and a first spring (316) is connected between the conical blocks (317) and the inner wall of the second chamber (32).

3. The SCR denitrification flue gas device for a coal-fired power plant according to claim 2, characterized in that: The denitration reaction device (3) further comprises: A first rotating shaft (35), the left end of the first rotating shaft (35) is rotatably connected to the upper part of the left inner wall of the first chamber (31), the right end of the first rotating shaft (35) is rotatably passed through the box body (318), the right end of the first rotating shaft (35) is connected to the first bevel gear (39), the first bevel gear (39) is meshed with the second bevel gear (310) for transmission, the middle of the first rotating shaft (35) is penetrated and connected with a plurality of third bevel gears (34), the third bevel gears (34) are meshed with a corresponding number of fourth bevel gears (36) for transmission, the fourth bevel gear (36) is connected to the third rotating shaft (38), the third rotating shaft (38) is rotatably passed through the fixed frame (329), the left and right ends of the fixed frame (329) are fixed on the inner side of the first chamber (31), the third rotating shaft (38) is connected to the fan (37), and the upper end of the second rotating shaft (311) is connected to the second bevel gear (310).

4. The SCR denitrification flue gas device for a coal-fired power plant according to claim 3, characterized in that: Also includes: A solution pipeline (331) is connected to a liquid storage tank (330) at its top, and the liquid storage tank (330) is fixed above the box body (318). The middle of the solution pipeline (331) passes through the upper wall of the box body (318), and the bottom of the solution pipeline (331) passes through the fixing frame (329). A plurality of nozzles are connected to the inner circumference of the filter barrel (315) at intervals, and the nozzles are connected to the solution pipeline (331).

5. The SCR denitrification flue gas device for a coal-fired power plant according to claim 1, characterized in that: The housing (325) is symmetrically fixedly disposed on both sides of the box body (318), and the baffle structure includes two groups of left-right symmetrical baffle assemblies.

6. The SCR denitrification flue gas device for a coal-fired power plant according to claim 5, characterized in that: The baffle assembly on the left side includes: a first baffle (324) penetrating the left outer wall of the box body (318); a first rack (323) is provided below the outer side of the first baffle (324); the first rack (323) is meshed with a third gear (322) for transmission; the first rack (323) and the third gear (322) are both located in a corresponding outer shell (325); and the third gear (322) is driven by a driving motor in the outer shell (325).

7. The SCR denitrification flue gas device for a coal-fired power plant according to claim 5, characterized in that: The first layer catalyst (326), the second layer catalyst (327), and the third layer catalyst (328) are respectively connected to a group of auxiliary devices, and the auxiliary devices connected to the first layer catalyst (326) include: The two fourth rotating shafts (333) are respectively rotatably connected to the left and right sides of the catalyst chamber (33); the second motor (332) is fixed to the outer wall of the housing (325) on the right side; the output shaft of the second motor (332) is fixedly connected to the fourth rotating shaft (333) on the right side; the two fourth rotating shafts (333) are respectively connected to symmetrically arranged mounting devices (4) on the sides close to each other; the first layer of catalyst (326) is installed between the two groups of mounting devices (4); the two fourth rotating shafts (333) are respectively provided with external threaded portions with opposite rotation directions; Two left-right symmetrical L-shaped rods (334), the upper or lower part of the L-shaped rod (334) is connected to the corresponding external threaded part, a flow channel is arranged inside the L-shaped rod (334), and a plurality of exhaust ports are arranged on a side of one end of the L-shaped rod (334) close to the inside of the box (318) and close to the first layer of catalyst (326), the exhaust ports are connected to the flow channel, and the air inlet of the flow channel is connected to the pressure gas inlet pipe.

8. The SCR denitrification flue gas device for a coal-fired power plant according to claim 7, characterized in that: The mounting device (4) on the right side comprises: A shell (41) is fixed to the left end of the fourth rotating shaft (333) on the right side, the left side of the shell (41) is open and provided with a fixing frame (49), and the fixing frame (49) is provided with a mounting hole for inserting the right part of the first layer catalyst (326); The limiting frame (44) is composed of two horizontal sections (441) spaced apart from each other and a vertical section (442). The vertical section (442) is fixedly connected to the right side between the two horizontal sections (441). The limiting frame (44) is located in the housing (41). The horizontal section (441) passes through the left wall of the housing (41). A first conical block (43) is arranged on the right side of the vertical section (442). A first conical surface with a higher left side and a lower right side is arranged on the right side of the first conical block (43). The upper end of the first conical block (43) is connected to the limiting rod ( 42), the limit rod (42) is threadedly connected to the upper wall of the shell (41); the second conical block (48) is symmetrically arranged on the side close to each other of the two horizontal sections (441), and the left side of the second conical block (48) on the upper side is provided with a second conical surface with a higher left side and a lower right side; the fixed block (45) is arranged on the left side of the vertical section (442), and a through hole for the fixed block (45) to pass through is arranged on the right side of the fixing frame (49), and a first mounting hole for connecting with the fixed block (45) is arranged on the right part of the first layer of catalyst (326); A plurality of second limiting rods (46) correspond one to one with a plurality of second conical blocks (48); the second limiting rods (46) penetrate the fixing frame (69) from top to bottom; a contact ball (410) on the outer side of the second limiting rod (46) contacts the second conical surface of the second conical block (48); the inner side of the second limiting rod (46) contacts the first layer of catalyst (326); and a second spring (47) is provided between the contact ball (410) and the upper and lower outer walls of the fixing frame (49).

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