Coal-fired power plant scr denitration flue gas device

Abstract

The present application relates to the technical fields of flue gas denitration, in particular to a coal-fired power plant SCR flue gas denitration device, which comprises a flue gas denitration reaction device, the flue gas denitration reaction device comprises: a box body fixed on a bottom plate, a first chamber and a second chamber distributed above and below and communicated with each other are arranged in the box body, a filter barrel is arranged in the second chamber, a catalyst chamber is further arranged below the second chamber in the box body, a flue gas duct two is arranged at the gas outlet of the lower part of the box body, the flue gas duct one is connected with the flue gas duct of the boiler, and the first layer of catalyst, the second layer of catalyst and the third layer of catalyst are arranged in the catalyst chamber in an upper and lower interval mode; three groups of baffle structures are 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 respectively. The opening direction of the baffle is adjusted regularly to prevent the long-time flue gas scouring and local blockage of the catalyst at individual positions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas denitrification technology, in particular to a coal-fired power plant SCR flue gas denitrification device. BACKGROUND

[0002] Since 2010, the boiler denitrification technology has been widely promoted in various thermal power plants, and by 2013, it has been fully covered. Whether it is in-furnace denitrification or out-furnace denitrification technology, it has been widely promoted and applied, and the operation condition is good. Especially the selective catalytic reduction (SCR) denitrification technology is widely used. Generally, the denitrification device of the power plant unit is arranged between the economizer and the preheater, and 2 SCR reactors are configured for each boiler. The catalyst layer is arranged in 2+1 (future layer), and the type is mostly honeycomb (or plate) type. The continuous working smoke temperature is 300-420℃. The catalyst area design flue gas flow rate is 5-6m / s. The maximum ammonia injection amount of each furnace is designed to be 190kg / h, and the denitrification efficiency is 80%.

[0003] The existing SCR flue gas denitrification device, such as CN214437946U, a SCR flue gas denitrification device using selective catalyst reduction method, has the following problems:

[0004] 1. The flue gas lacks a filtering device before entering the catalyst, which is easy to be blocked by large-particle impurities in the flue gas;

[0005] 2. The size of the flue gas inlet between different layers of catalysts in the reduction bin cannot be adjusted, which is not convenient for meeting different use requirements. SUMMARY

[0006] The present application provides a coal-fired power plant SCR flue gas denitrification device to solve at least one of the technical problems in the above background technology.

[0007] To solve the above technical problems, the present application discloses a coal-fired power plant SCR flue gas denitrification device, which comprises a denitrification reaction device, the denitrification reaction device comprising:

[0008] a box body fixed on the bottom plate, a first chamber and a second chamber distributed above and below and communicated with each other are arranged in the box body, a filter barrel is arranged in the second chamber, a catalyst chamber is further arranged below the second chamber in the box body, a flue one is connected to the gas inlet of the first chamber, the flue one is connected to the flue gas discharge channel of the boiler, and a flue two is arranged at the gas outlet of the lower part of the box body; the first layer of catalyst, the second layer of catalyst and the third layer of catalyst are arranged in the catalyst chamber in an upper and lower interval manner.

[0009] Three groups of baffle structures are 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 lower end of the filter barrel is inclined outwardly, and the denitration reaction device further comprises:

[0011] A rotating body is in contact with the lower end of the filter barrel, and the rotating body is rotatably connected to a fixed block fixed to the inner wall of the box body.

[0012] A second rotating shaft is vertically arranged, and the lower end of the second rotating shaft is connected to the output shaft of the first motor.

[0013] A plurality of conical blocks are arranged at intervals along the upper end of the filter barrel, and the conical blocks are connected to the inner wall of the second chamber through the first springs.

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

[0015] A first rotating shaft is rotatably connected to the upper part of the left inner wall of the first chamber, and the right end of the first rotating shaft penetrates through the box body.

[0016] Preferably, the denitration reaction device further comprises:

[0017] A solution pipeline is connected to a liquid storage tank above the solution pipeline, and the liquid storage tank is fixed above the box body.

[0018] Preferably, the box body is symmetrically fixed with a shell on both sides, and the baffle structure comprises two groups of left-right symmetrical baffle assemblies.

[0019] Preferably, the left baffle assembly comprises: a first baffle penetrating through the left outer wall of the box body, a first rack being arranged on the outer side of the first baffle, and the first rack being in transmission connection with a third gear.

[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.

[0021] Two fourth rotating shafts are respectively rotatably connected to the left and right sides of the catalyst chamber, the second motor is fixed to the outer wall of the right side shell, the output shaft of the second motor is fixedly connected to the third rotating shaft on the right side, and the two fourth rotating shafts are respectively connected to the symmetrically arranged mounting devices on the side close to each other, and the first layer of catalyst is mounted between the two groups of mounting devices; and the two fourth rotating shafts are respectively provided with outer threads in opposite rotation directions.

[0022] Two left and right symmetrical L-shaped rods are connected to the corresponding outer threads at the upper portion or the lower portion of the L-shaped rod, a flow channel is arranged in the L-shaped rod, a plurality of exhaust ports are arranged on the side of the end of the L-shaped rod close to the first layer of catalyst in the box body, the exhaust ports are communicated with the flow channel, and the inlet of the flow channel is communicated with the pressure gas inlet pipe.

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

[0024] A shell is fixed to the left end of the fourth rotating shaft on the right side, the shell is provided with an opening on the left side and a fixing frame, and the fixing frame is provided with a mounting hole for the right part of the first layer of catalyst to be inserted;

[0025] A limiting frame is composed of two horizontally spaced horizontal sections and a vertical section, the vertical section is fixedly connected between the two horizontal sections on the right side, the limiting frame is located in the shell, the horizontal sections penetrate through the left wall of the shell, the vertical section is provided with a first conical block on the right side, the first conical block is provided with a first conical surface with a left high and right low structure on the right side, the upper end of the first conical block is in contact with the arc-shaped contact surface of the lower end of the limiting rod, and the limiting rod is threadedly connected and penetrates through the upper wall of the shell; the two horizontal sections are symmetrically provided with a second conical block on the side close to each other, the second conical block on the upper side is provided with a second conical surface with a left high and right low structure on the left side; the vertical section is provided with a fixed block on the left side, the fixing frame is provided with a through hole through which the fixed block passes, and the right part of the first layer of catalyst is provided with a first mounting hole for being connected with the fixed block;

[0026] A plurality of second limiting rods correspond to the plurality of second conical blocks in a one-to-one manner, the second limiting rods penetrate through the fixing frame in the up-down direction, the contact balls on the outer side of the second limiting rods are in contact with the second conical surfaces of the second conical blocks, the inner sides of the second limiting rods are in contact with the first layer of catalyst, and the second springs are arranged between the contact balls and the upper and lower outer walls of the fixing frame.

[0027] The technical scheme of the present application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

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

[0029] Figure 1 It is a structural schematic diagram of the present application;

[0030] Figure 2 is a local enlarged view of A of Figure 1

[0031] Figure 3 is a local enlarged view of B of Figure 1

[0032] Figure 4 is a top view of the filter barrel of the present application;

[0033] Figure 5 is a schematic view of the mounting device structure in the present application.

[0034] In the figure: 1, boiler; 11, bottom plate; 12, support seat; 13, flue one; 14, flue two; 2, coal 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 body; 319, filter hole; 320, fixed block; 321, rotating body; 322, third gear; 323, first rack; 324, first baffle; 325, outer shell; 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, shell; 42, limiting rod; 43, first conical block; 44, limiting frame; 441, horizontal section; 442, vertical section; 45, fixed 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 application will be described hereinafter with reference to the accompanying drawings, in which the preferred embodiments of the present application described are presented by way of illustration and explanation, and are not intended to limit the present application.

[0036] ​​In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and does not mean to particularly indicate the order or sequence, nor to limit the present application, which is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0037] The present application provides the following embodiments

[0038] Embodiment 1

[0039] The present application provides a coal-fired power plant SCR denitration flue gas device, as shown in Figures 1-4 The denitration reaction device 3 comprises:

[0040] The box body 318 is fixed on the bottom plate 11, and the first chamber 31 and the second chamber 32 distributed upward and downward and communicated with each other are arranged in the box body 318. The filter barrel 315 is arranged in the second chamber 32, and the catalyst chamber 33 is further arranged below the second chamber 32 in the box body 318. The gas inlet of the first chamber 31 is connected with the flue 1, and the flue 1 is connected with the flue gas passage of the boiler 1. The gas outlet of the lower part of the box body 318 is provided with the flue 2.

[0041] Preferably, a plurality of support seats 12 are arranged below the bottom plate 11.

[0042] Preferably, the lower end of the filter barrel 315 is inclined outward, and the denitration reaction device 3 further comprises:

[0043] The rotating body 321 is in contact with the plurality of rotating bodies 321 on the outer side of the lower end of the filter barrel 315, and the rotating body 321 is rotatably connected with the fixed block 320 fixed on the inner wall of the box body 318. The filter barrel 315 is provided with a filter hole 319 on the lower side, and the second gear 313 is sleeved on the outer side of the upper part of the filter barrel 315. The second gear 313 is engaged with the first gear 312 for transmission.

[0044] The second rotating shaft 311 is vertically arranged, and the lower end of the second rotating shaft 311 is connected with the output shaft of the first motor 314. The first gear 312 is fixedly sleeved on the middle of the second rotating shaft 311, and the first motor 314 is arranged on the outer side of the box body 318.

[0045] A plurality of conical blocks 317 are arranged at intervals along the outer side of the upper end of the filter barrel 315, and the conical blocks 317 are connected with the inner wall of the second chamber 32 through the first springs 316.

[0046] Preferably, the denitration reaction device 3 further comprises:

[0047] The first rotating shaft 35 is rotatably connected to the upper part of the left inner wall of the first chamber 31 at the left end of the first rotating shaft 35, and rotatably penetrates the box 318 at the right end of the first rotating shaft 35. The first rotating shaft 35 is connected with the first bevel gear 39 at the right end of the first rotating shaft 35, and the first bevel gear 39 is in meshing transmission with the second bevel gear 310. A plurality of third bevel gears 34 are connected to the first rotating shaft 35 at the middle of the first rotating shaft 35, and the third bevel gears 34 are in meshing transmission with a corresponding number of fourth bevel gears 36. The fourth bevel gears 36 are connected with the third rotating shaft 38, and the third rotating shaft 38 rotatably penetrates the fixing frame 329. The fixing frame 329 is fixed to the inner side of the first chamber 31 at both ends of the fixing frame 329. The third rotating shaft 38 is connected with the fan 37, and the second rotating shaft 311 is connected with the second bevel gear 310 at the upper end of the second rotating shaft 311.

[0048] Preferably, the denitration reaction device 3 further comprises:

[0049] The solution pipeline 331 is connected with the liquid storage tank 330 above the solution pipeline 331, and the liquid storage tank 330 is fixed above the box 318. The solution pipeline 331 penetrates the upper wall of the box 318 at the middle of the solution pipeline 331, and penetrates the fixing frame 329 below the solution pipeline 331. A plurality of nozzles are connected at intervals to the inner side of the filter barrel 315, and the nozzles are in communication with the solution pipeline 331.

[0050] Preferably, the flue gas duct two 14 is in communication with the air preheater 5, and the flue gas duct one 13 is in communication with the coal economizer 2.

[0051] Preferably, the fan 37 can be an existing induced draft fan.

[0052] The beneficial effects of the above technical scheme are: in the present application, the flue gas in the boiler 1 enters the first chamber 31 of the denitration reaction device 3 along the flue 13, at this time the first motor 314 is opened, the second bevel gear 310 sleeved with the second shaft 311 starts to rotate, the first bevel gear 39 meshing with the second bevel gear 310 also starts to rotate with the first shaft 35, since the third bevel gear 34 is connected with the first shaft 35, the fourth bevel gear 36 meshing with the third bevel gear 34 starts to drive the fan 37 to rotate, at this time the rotation of the fan 37 can control the flow rate of the flue gas in the flue; the reaction liquid (which can be ammonia water) in the liquid storage tank 330 enters the filter barrel 315 through the solution pipeline 331 and the spray head, mixes with the flue gas in the filter barrel 315, then reacts with the three layers of catalysts in the catalyst chamber 33, and finally the reaction completed gas is discharged from the flue 14; since the first gear 312 is sleeved on the second shaft 311, the second shaft 311 rotates, then the second gear 313 meshing with the first gear 312 also starts to rotate, then the filter barrel 315 also starts to rotate, so that the range of spraying the reaction liquid (such as ammonia water) by the spray head can be effectively controlled; the outer side of the lower end of the filter barrel 315 is inclined, the outer side of the lower end of the filter barrel 315 is in contact with a plurality of rotating bodies 321, which can effectively reduce the friction when the filter barrel 315 rotates, a plurality of conical blocks 317 are further arranged on the outer side of the upper end of the filter barrel 315, which can effectively prevent the filter barrel 315 from rotating from the top and facilitate replacement of the filter barrel 315; and the filter barrel 315 filters large particle impurities first, so that the large particle impurities do not block the catalyst.

[0053] The present application prevents long-term flue gas scouring and local blockage of the catalyst at individual positions by periodically adjusting the opening direction of the baffle.

[0054] The present application solves the problems in the background art: the existing SCR denitration flue gas device, such as the SCR flue gas denitration device of CN214437946U, has the following problems: 1. There is no filter device for flue gas before entering the catalyst, which is easy to block the catalyst due to large particle impurities in the flue gas; 2. The size of the flue gas inlet between different layers of catalysts in the reduction bin cannot be adjusted, which is not convenient for different use requirements (the problem is solved by setting a baffle and adjusting the opening of the baffle).

[0055] The present application also has the following effects: improving the uniformity of the flow field of the SCR reactor:

[0056] 1) Eliminate uneven flue gas flow field;

[0057] 2) Less catalyst local dust accumulation, damage and collapse

[0058] 3) By increasing the flue gas speed in the catalyst channel, the conversion rate of SO2 to SO3 is reduced.

[0059] 4) Through the throttle adjustment, effectively prevent the induced draft fan prone to stall, surge and other problems during low load, improve the safety and reliability of the equipment.

[0060] Example 2, based on example 1, as shown in Figure 1 The box 318 is symmetrically fixed on both sides of the shell 325;

[0061] The first layer of catalyst 326, the second layer of catalyst 327 and the third layer of catalyst 328 are arranged in the catalyst chamber 33.

[0062] Three sets of baffle structures are 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.

[0063] Preferably, the baffle structure includes two sets of left and right symmetric baffle assemblies, the left baffle assembly includes a first baffle 324 penetrating the left outer wall of the box 318, a first rack 323 is arranged below the outer side of the first baffle 324, the first rack 323 is in meshing transmission with a third gear 322, the first rack 323 and the third gear 322 are located in the corresponding shell 325, and the third gear 322 is driven by a driving motor in the shell 325.

[0064] The beneficial effects of the above technical solution are:

[0065] When the reaction liquid and flue gas enter the catalyst chamber 33, the present application has three layers of catalyst, and a baffle is arranged above each catalyst layer. When the load is 100%, the third gear 322 is controlled to rotate, and the first rack 323 meshing with the third gear 322 starts to rotate. At this time, the baffle is fully opened. With the decrease of load, especially during 70% to the lowest load, by adjusting the opening degree of the baffle, the flue gas flow velocity in the catalyst area is designed to be 5-6 m / s, and the fan operates at a safe speed, so that part of the catalyst works normally, and the remaining part is in a hot standby state. By adjusting the direction of the baffle opening degree periodically, the problem of long-time flue gas scouring and local blockage of the catalyst in individual positions is prevented.

[0066] Example 3

[0067] Based on example 2, as shown in Figure 1 And Figure 5 The first layer of catalyst 326, the second layer of catalyst 327 and the third layer of catalyst 328 are respectively connected to a set of auxiliary devices, and the auxiliary device connected to the first layer of catalyst 326 includes:

[0068] Two fourth rotating shafts 333 are respectively connected with the left and right sides of the catalyst chamber 33, the second motor 332 is fixed on the outer wall of the right side of the shell 325, the output shaft of the second motor 332 is fixedly connected with the fourth rotating shaft 333 on the right side, and the two fourth rotating shafts 333 are respectively connected with the symmetrically arranged mounting devices 4 on the side close to each other, and the first layer of catalyst 326 is mounted between the two groups of mounting devices 4; the two fourth rotating shafts 333 are respectively provided with outer thread parts in opposite rotation directions;

[0069] Two left and right symmetrical L-shaped rods 334 are connected with the corresponding outer thread parts at the upper parts or the lower parts of the L-shaped rods 334, flow channels are arranged in the L-shaped rods 334, a plurality of exhaust ports are arranged on the side of the end of the L-shaped rod 334 close to the inner side of the box body 318 and close to the first layer of catalyst 326, the exhaust ports are communicated with the flow channels, and the gas inlet of the flow channel is communicated with the pressure gas inlet pipe.

[0070] Preferably, the mounting device 4 on the right side comprises:

[0071] The shell 41 is fixed on the left end of the fourth rotating shaft 333 on the right side, the left side of the shell 41 is provided with an opening and a fixing frame 49, and the fixing frame 49 is provided with a mounting hole for the right part of the first layer of catalyst 326 to be inserted;

[0072] The limiting frame 44 is composed of two horizontally arranged horizontal sections 441 and a vertical section 442, the vertical section 442 is fixedly connected between the two horizontal sections 441 on the right side, the limiting frame 44 is located in the shell 41, the horizontal sections 441 penetrate through the left wall of the shell 41, the vertical section 442 is provided with the first conical block 43 on the right side, the first conical block 43 is provided with a first conical surface with the left side being higher than the right side on the right side, the upper end of the first conical block 43 is in contact with the arc-shaped contact surface of the lower end of the limiting rod 42, and the limiting rod 42 is threadedly connected and penetrates through 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 second conical block 48 on the upper side is provided with a second conical surface with the left side being higher than the right side on the left side; the vertical section 442 is provided with the fixed block 45 on the left side, the fixing frame 49 is provided with a through hole through which the fixed block 45 passes on the right side, and the right part of the first layer of catalyst 326 is provided with a first mounting hole for being connected with the fixed block 45;

[0073] A plurality of second limiting rods 46 correspond to the second conical blocks 48 in a one-to-one manner, the second limiting rods 46 penetrate through the fixing frame 69 upward and downward, the contact ball 410 on the outer side of the second limiting rod 46 is in contact with the second conical surface of the second conical block 48, the inner side of the second limiting rod 46 is in contact with the first layer of catalyst 326, and the second spring 47 is arranged between the contact ball 410 and the upper and lower outer walls of the fixing frame 49.

[0074] In this invention, dust suction pipes are respectively installed above the first catalyst layer 326, between the second catalyst layer 327 and the first catalyst layer 326, and between the third catalyst layer 328 and the second catalyst layer 327, and the dust suction pipes are connected to a dust suction device. In this invention, a rinsing pipe and a drying device can also be installed above the first catalyst layer 326, between the second catalyst layer 327 and the first catalyst layer 326, and between the third catalyst layer 328 and the second catalyst layer 327, so as to realize the cleaning and drying of the corresponding catalysts.

[0075] Among them, a valve can be installed in flue 13;

[0076] The beneficial effects of the above technical solution are as follows:

[0077] 1. In this invention, the catalyst (first layer catalyst 326, second layer catalyst 327, and third layer catalyst 328) is installed on the corresponding mounting device. When the second motor 332 is turned on, the fourth rotating shaft 333 rotates, causing the catalyst to rotate, which can adjust the position of the catalyst.

[0078] 2. When a catalyst becomes clogged, the corresponding first baffle 324 is sealed (for example, to remove dust from the first layer of catalyst 326, the two first baffles in the first layer are controlled to contact and seal each other) to avoid affecting other catalysts, and then dust removal is started;

[0079] 3. During dust removal, when the corresponding second motor 332 is controlled, the fourth rotating shaft 333 rotates, driving the catalyst to rotate. For example, in... Figure 1 Based on this, rotating counterclockwise, while coordinating with the left and right movement of the L-shaped rod 334, allows for high-pressure dust removal from the catalyst surface through the exhaust port of the L-shaped rod 334. The rotation of the fourth rotating shaft 333 drives the catalyst to rotate, which can adjust the range of action of the exhaust port on the one hand, and adjust the catalyst to a certain angle to facilitate the discharge of dust and other substances from the catalyst on the other hand. Finally, the dust is sucked up through the suction pipe to clean the catalyst, thus achieving online cleaning of the catalyst.

[0080] Furthermore, when dust is not removed, the exhaust ports of the L-shaped rod 334 are all sealed inside the housing to prevent smoke from entering.

[0081] 4. In the mounting device, when the catalyst needs to be installed, the left and right parts of the catalyst are installed into the corresponding mounting holes of the mounting device, and then the limiting rods 42 on the left and right sides are controlled to work, taking the working of the limiting rod 42 on the right side as an example: the limiting rod 42 is rotated so that the limiting rod 42 moves downward, the first conical block 43 is extruded, and in the process of the downward pressing of the limiting rod 42, the limiting frame 44 starts to move to the left, on the one hand, because the upper and lower inner walls of the limiting frame 44 are provided with the second conical block 48, the second conical block 48 moves to the left, extruding the second limiting rod 46 on the upper and lower sides to move inward, so as to achieve the clamping state of the upper and lower ends of the right part of the catalyst; on the other hand, because the inner side of the vertical section 442 of the limiting frame 44 is provided with the fixed block 45, when the limiting frame 44 starts to move to the left, the fixed block 45 will extrude the catalyst to the left, and finally the two fixed blocks 45 on the left and right sides clamp the catalyst again, so that the catalyst is clamped well (clamped by the left and right clamping of the fixed block 45 and the upper and lower clamping of the left and right parts), which is also beneficial to prevent the catalyst from falling off easily during rotation. The present application only needs to control the limiting rod 42 to achieve the clamping of the catalyst, and the catalyst can be conveniently installed and removed, which saves the complex process of the workers.

[0082] In any one of embodiments 1-3, further comprising:

[0083] A rotation speed detection device is configured to detect the rotation speed of the filter barrel.

[0084] A first flow detection device is configured to detect the air flow at the flue gas inlet of the box body 318.

[0085] A second flow detection device is configured to detect the flow at the outlet of the spray head; wherein the spray head is an atomizing spray head.

[0086] A second density detection device is configured to detect the air density at the flue gas inlet of the box body 318.

[0087] A first temperature detection device is configured to detect the fluid temperature at the outlet of the spray head.

[0088] A first density detection device is configured to detect the liquid density in the solution pipeline 331.

[0089] A second temperature detection device is configured to detect the air flue gas temperature at the flue gas inlet of the box body 318.

[0090] The control device, the alarm one and the alarm two are electrically connected with the rotation 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 one and the alarm two respectively, and the control device controls the alarm one and the alarm two to work based on the rotation 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, and comprises the following steps:

[0091] The current mixing state coefficient is calculated periodically 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 in the corresponding first preset range, the control device controls the alarm one to alarm, and the control device adjusts at least one of the motor 314 and the atomizing nozzle according to the current mixing state coefficient, so that the adjusted mixing state coefficient is in the corresponding first preset range.

[0092]

[0093] P is the current mixing state coefficient, N is the total number of the nozzles arranged along the circumferential direction of the filter barrel, e is a natural constant (the value is 2.72), n is the detection value of the rotation speed detection device, n0 is the unit rotation 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 atomizing particle size of the atomizing nozzle, ρ2 is the detection value of the second density detection device, 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.

[0094] The actual detection values of each detection device detected in the first period are taken as preset reference values, the number of times of alarming of the alarm one in a certain time period, the mixing state coefficient at each time of alarming and the variation degree of each detection device at each time of alarming are obtained, when the variation degree of the detection device is greater than the corresponding preset range, the alarm two alarms, and the corresponding detection device is determined as an abnormal variation detection device, and the adjustment strategy of the whole device is determined according to the abnormal degree of the abnormal variation detection device (for example, the abnormal detection device is overhauled and adjusted).

[0095]

[0096]

[0097] S ji is the variation degree of the i th detection device at the j th time of alarming; B jiis the actual detection value of the ith detection device at the jth alarm; B j0 is the preset reference value of the ith detection device, S i is the maximum allowable degree of change of the ith detection device; H i is the abnormality degree of the ith detection device; E i is the number of times that the change degree of the ith detection device is greater than the corresponding preset threshold value within a certain time period, and G is the number of times that the alarm is triggered within a certain time period.

[0098] The beneficial effects of the above technical solutions are:

[0099] 1. By obtaining the air parameters (flow, temperature, density) at the flue gas inlet of the measuring box 318, the parameters (flow, temperature, density) of the atomized reaction liquid, and the number of spray heads and the rotation speed of the filter barrel, the real-time air parameter state at the flue gas inlet of the box 318 and the mixing state of the flue gas and the reaction liquid under the atomized reaction liquid parameter state are obtained. When the mixing state is abnormal, the alarm is triggered in time, and the atomized spray head and the first motor 314 (the valve can also be adjusted to work) are automatically adjusted to work, so as to ensure that the mixing state of the reaction liquid is in a suitable state, ensure the mixing effect, and facilitate the subsequent denitration effect.

[0100] 2. The actual detection values of each detection device detected in the first cycle are used as the preset reference values, the number of times that the alarm is triggered within a certain time period, the mixing state coefficient at each alarm, and the change degree of each detection device at each alarm are obtained. When the change degree of the detection device is greater than the corresponding preset threshold value, the alarm is triggered, and the corresponding alarm device is determined as an abnormal change detection device. According to the abnormality degree of the abnormal change detection device, the adjustment strategy of the entire device is determined (such as the abnormality degree of the second flow detection device is too large, the corresponding spray head is adjusted, and the corresponding spray head is overhauled (the spray head atomization state is abnormal)). The dynamic change state of each detection device within a certain time period is obtained, which facilitates the adjustment of the corresponding parameters of each detection device according to the dynamic change state of each detection device, and ensures the denitration effect.

[0101] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A SCR denitrification flue gas device for a coal-fired power plant, characterized in that, The denitrification reaction unit (3) includes: The box (318) is fixed on the base plate (11). The box (318) is provided with a first chamber (31) and a second chamber (32) that are distributed vertically and interconnected. The second chamber (32) is provided with a filter barrel (315). The box (318) is also provided with a catalyst chamber (33) located below the second chamber (32). The air inlet of the first chamber (31) is connected to the flue (13). The flue (13) is connected to the exhaust channel of the boiler (1). The air outlet at the bottom of the box (318) is provided with a second flue (14). 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) arranged vertically and horizontally. Three sets of baffle structures are respectively set 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); The outer shell (325) is symmetrically fixed on both sides of the box (318), and the baffle structure includes two sets of left and right symmetrical baffle assemblies; The baffle assembly on the left side includes: a first baffle (324) that penetrates the outer wall of the left side of the housing (318), a first rack (323) provided on the lower outer side of the first baffle (324), the first rack (323) meshing with a third gear (322) for transmission, the first rack (323) and the third gear (322) are both located in the corresponding housing (325), and the third gear (322) is driven by a drive motor in the housing (325); The baffle can be adjusted to ensure that the designed flue gas velocity in the catalyst area is 5-6 m / s, and the fan operates at a safe speed, so that a part of the catalyst works normally and the rest is in a hot standby state. The baffle opening direction can also be adjusted periodically to prevent long-term flue gas scouring and local blockage of individual parts of the catalyst.

2. The SCR denitrification flue gas device for a coal-fired power plant according to claim 1, characterized in that, The lower outer side of the filter barrel (315) is sloped, and the denitrification reaction device (3) also includes: Rotating body (321), the lower outer side of the filter barrel (315) is in contact with several rotating bodies (321), the rotating body (321) is rotatably connected to the fixing block (320) fixed to the inner wall of the box (318), the filter barrel (315) is provided with filter holes (319) on the lower side, the upper outer side of the filter barrel (315) is sleeved with a second gear (313), the second gear (313) meshes 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 first gear (312) is fixedly sleeved in the middle of the second rotating shaft (311). The first motor (314) is located on the outside of the housing (318). Several 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 denitrification reaction device (3) also includes: The first rotating shaft (35) is rotatably connected at its left end to the upper part of the left inner wall of the first chamber (31). The right end of the first rotating shaft (35) rotates through the housing (318). The right end of the first rotating shaft (35) is connected to the first bevel gear (39). The first bevel gear (39) meshes with the second bevel gear (310). Several third bevel gears (34) are connected through the middle of the first rotating shaft (35). The third bevel gears (34) mesh with the corresponding number of fourth bevel gears (36). The fourth bevel gears (36) are connected to the third rotating shaft (38). The third rotating shaft (38) rotates through the fixing frame (329). The left and right ends of the fixing frame (329) are fixed inside the first chamber (31). The third rotating shaft (38) is connected to the fan (37). 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 pipe (331) is connected to a storage tank (330) above the solution pipe (331). The storage tank (330) is fixed above the box body (318). The solution pipe (331) passes through the upper wall of the box body (318) in the middle. A fixing frame (329) passes through the lower part of the solution pipe (331). Several nozzles are connected at intervals on the inner periphery of the filter bucket (315). The nozzles are connected to the solution pipe (331).

5. The SCR denitrification flue gas device for a coal-fired power plant according to claim 1, characterized in that, The first catalyst layer (326), the second catalyst layer (327), and the third catalyst layer (328) are each connected to a set of auxiliary devices. The auxiliary devices connected to the first catalyst layer (326) include: 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 on the outer wall of the outer shell (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 side that is 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 directions of rotation. Two symmetrical L-shaped rods (334) are provided. The upper or lower part of the L-shaped rod (334) is connected to the corresponding external thread. The L-shaped rod (334) is provided with a flow channel. Several exhaust ports are provided on the side of the L-shaped rod (334) near the first catalyst layer (326) near the end of the box (318). The exhaust ports are connected to the flow channel. The air inlet of the flow channel is connected to the pressurized gas inlet pipe.

6. The SCR denitrification flue gas device for a coal-fired power plant according to claim 5, characterized in that, The mounting device (4) on the right side includes: The housing (41) is fixed to the left end of the fourth rotating shaft (333) on the right side. The housing (41) has an opening on the left side and is provided with a fixing bracket (49). The fixing bracket (49) is provided with a mounting hole for the right side of the first layer catalyst (326) to be inserted. The limiting frame (44) consists of two horizontally spaced sections (441) 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 inside the housing (41). The horizontal sections (441) penetrate the left wall of the housing (41). A first conical block (43) is provided on the right side of the vertical section (442). The right side of the first conical block (43) has a first conical surface that is higher on the left and lower on the right. The upper end of the first conical block (43) is connected to the limiting rod (…). 42) The lower end of the arc-shaped contact surface contacts, and the limiting rod (42) is threaded through the upper wall of the housing (41); the two horizontal sections (441) are symmetrically arranged with second conical blocks (48) on the side that are close to each other, and the upper second conical block (48) is provided with a second conical surface that is higher on the left and lower on the right; the vertical section (442) is provided with a fixing block (45) on the left, and the fixing frame (49) is provided with a through hole for the fixing block (45) to pass through on the right side; the first layer of catalyst (326) is provided with a first mounting hole for connecting with the fixing block (45) on the right side; A number of second limiting rods (46) correspond one-to-one with a number of second conical blocks (48). The second limiting rods (46) pass through the fixing frame (49) vertically. The 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). 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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