Dust removal and denitration integrated device for cement kiln

Abstract

The utility model relates to a dust removal and denitration integrated device for a cement kiln. The dust removal and denitration integrated device comprises an integrated bin, and a rectifying device, a dust removal area and a denitration area which are arranged in the integrated bin, the integrated bin extends in the vertical direction and is sequentially provided with a flue gas outlet, a flue gas inlet and an ash discharging opening from top to bottom, and the rectifying device is close to the flue gas inlet. The dust removal area is arranged above the dust discharge port and provided with a dust collection electrode and a corona electrode, the dust collection electrode comprises an anode frame and an anode plate, and the anode plate is in a long-strip-shaped plate shape and can shake under the action of airflow to conduct self-dust removal. The corona electrode comprises a cathode frame and a cathode wire. The denitration area is arranged above the dust removal area, the denitration area is provided with a plurality of catalyst layers and an ash removal device, the catalyst layers are arranged up and down at intervals, and the ash removal device is used for removing ash on the bottom surface of a denitration catalyst. The dust removal and denitration functions of flue gas are integrated in the integrated bin, the needed occupied area is small, the dust removal area and the denitration area do not need to be connected through an elbow, the internal flow field is smoother, and the system operation resistance is smaller.

Description

Technical Field

[0001] The utility model relates to the field of flue gas treatment, and in particular to an integrated dust removal and denitrification device for a cement kiln. Background Art

[0002] SCR denitrification technology is the mainstream technology for cement kilns to achieve ultra-low NOx emissions in flue gas. Since the outlet temperature of the C1 preheater of the cement kiln is generally 300-320℃, SCR denitrification is generally carried out here. However, the dust concentration at the outlet of the C1 preheater is too high, reaching 80-120g / Nm 3 , and the dust has a high content of alkaline earth metals, and has the characteristics of high viscosity, strong adhesion and small particle size. This type of high-dust flue gas directly entering the SCR denitrification can easily cause problems such as blockage and wear of the SCR denitrification catalyst. Therefore, considering adding a dust removal device before cement SCR denitrification to reduce dust concentration is an effective measure to ensure the stable operation of cement SCR denitrification.

[0003] At present, there are two main types of dust removal at the front end of cement SCR denitrification: metal filter bag dust removal and high-temperature electrostatic precipitator. Metal filter bag dust removal can remove most of the dust in the flue gas. Although it solves the problem of catalyst wear and blockage, due to the small particle size of cement dust, it is easy to embed in the filter bag. As the running time increases, the filter bag resistance rises rapidly, the system resistance is large, and there is also bag dust removal at the rear end of the cement kiln. The metal filter bag at the front end is excessive dust removal. In addition, the investment and maintenance costs of metal filter bags are high, and the overall effect and economy are not good.

[0004] High-temperature electrostatic precipitators can reasonably control the dust entering the SCR denitrification system and adjust it according to the needs of SCR denitrification, making the technology more reasonable. However, currently, high-temperature electrostatic precipitators all use conventional plate horizontal electrostatic precipitators. The flue gas flows horizontally inside the electrostatic precipitator channel. After the dust approaches the plate under the action of the electric field, it falls vertically into the ash hopper at the bottom by its own weight after it detaches from the plate under the action of the vibration device. In order to prevent the dust that falls vertically into the ash hopper from being carried out of the electric field by the horizontal flue gas, the flow rate in the channel is generally less than 1.5m / s. In order to meet the flow requirements, the electrostatic precipitator body must be large enough. And after dust removal, it flows horizontally out of the electric field and enters the SCR denitrification device. The large number of flue elbows increases the resistance, the system energy consumption is high, and the entire device occupies a large area. Utility Model Content

[0005] The utility model aims to provide an integrated dust removal and denitrification device for a cement kiln, so as to solve the problems of high investment cost, large floor space and high energy consumption of system operation existing in the dust removal and denitrification devices in the related technology.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions.

[0007] The utility model provides an integrated dust removal and denitrification device for a cement kiln, which is connected to a preheater outlet of a cement production line through an inlet flue, and an ammonia spraying device is arranged on the inlet flue. The integrated dust removal and denitrification device for a cement kiln comprises:

[0008] An integrated bin extending vertically, wherein the integrated bin is provided with a smoke outlet, a smoke inlet and an ash discharge port arranged in sequence from top to bottom, and the smoke inlet is connected to the inlet flue;

[0009] A rectifying device is arranged in the integrated bin and close to the smoke inlet, and the rectifying device is evenly provided with a plurality of rectifying holes;

[0010] A dust removal area is arranged in the integrated bin and above the ash discharge port, wherein the dust removal area is provided with a dust collecting electrode and a corona electrode, wherein the dust collecting electrode comprises an anode frame and an anode plate connected to the anode frame, wherein the anode frame is provided with a plurality of anode plates spaced side by side, and each of the anode frames is connected with a plurality of anode plates spaced side by side, and the anode plates are in the shape of long strips so that the anode plates can shake under the action of airflow, wherein the corona electrode comprises a cathode frame and a cathode wire connected to the cathode frame, wherein the cathode frame is provided with a plurality of cathode wires spaced side by side and staggered with the anode frame, and each of the cathode frames is connected with a plurality of cathode wires spaced side by side;

[0011] A denitration zone is arranged in the integrated bin and above the dust removal zone. The denitration zone is provided with a catalyst layer and a dust cleaning device. A denitration catalyst is arranged on the catalyst layer, and multiple layers are arranged at intervals above and below the catalyst layer. The dust cleaning device is used to clean the denitration catalyst.

[0012] The flue gas entering the integrated warehouse from the flue gas inlet passes through the rectifying device, the dust removal area and the denitrification area in sequence and is then discharged from the flue gas outlet.

[0013] In some embodiments of the present application, the smoke inlet is arranged at a position near the bottom of the side of the integrated bin;

[0014] The smoke outlet is arranged at the top of the integrated bin;

[0015] The ash discharge port is arranged at the bottom of the integrated bin.

[0016] In some embodiments of the present application, the rectifying device is arranged horizontally and is disposed above the smoke inlet;

[0017] The dust removal area is arranged above the rectifying device.

[0018] In some embodiments of the present application, the side portion of the integrated bin protrudes outward near the bottom to form an entrance area;

[0019] The smoke inlet is arranged in the inlet area;

[0020] The rectifying device is arranged vertically, and is arranged in the inlet area and on one side of the smoke inlet;

[0021] The lower part of the dust removal zone is arranged on the side of the rectifying device facing away from the smoke inlet, and the upper part of the dust removal zone is arranged above the side of the rectifying device facing away from the smoke inlet.

[0022] In some embodiments of the present application, the dust cleaning device includes a first dust cleaning component and a second dust cleaning component;

[0023] The first cleaning components are provided in multiple groups and are respectively arranged below each of the catalyst layers, and the first cleaning components are used to clean the bottom surface of the denitration catalyst;

[0024] The second cleaning components are provided in multiple groups and are respectively arranged above each of the catalyst layers. The second cleaning components are used to clean the top surface of the denitration catalyst.

[0025] In some embodiments of the present application, one end of the anode plate is fixedly connected to the anode frame;

[0026] The other end of the anode plate is movably connected to the anode frame. In some embodiments of the present application, the cement kiln dust removal and denitrification integrated device further includes an ash discharger;

[0027] The ash discharger is used to receive the dust discharged from the ash discharge port and discharge the dust to the raw material storehouse.

[0028] In some embodiments of the present application, the flue gas outlet is connected to the inlet of the waste heat boiler through an outlet flue.

[0029] In some embodiments of the present application, the outlet of the waste heat boiler is connected to a fan, and the flue gas is transported to the raw material grinding equipment through the fan.

[0030] In some embodiments of the present application, the anode plate extends vertically, and has a width of 30 mm to 60 mm and a thickness of 0.1 mm to 1 mm.

[0031] It can be seen from the above technical solutions that the embodiments of the utility model have at least the following advantages and positive effects:

[0032] In the integrated device for dust removal and denitrification of cement kilns of the embodiment of the utility model, the integrated bin is a vertical structure extending vertically, which can reduce the occupied area.

[0033] The flue gas enters the integrated bin through the flue gas inlet. The flue gas first passes through the rectifier, and the flue gas is evenly distributed through multiple rectifier holes evenly distributed on the rectifier. Then the evenly distributed flue gas passes through the dust removal area, which is conducive to improving the dust removal effect. A large number of negative ions will be generated near the cathode line. When the dust-containing flue gas passes through, the negative ions collide with the dust and adsorb on the dust surface, charging the dust. The charged dust moves to the anode plate under the action of the electric field force, deposits on the surface of the anode plate and releases the charge. When the deposited dust reaches a certain thickness, the anode plate is in the shape of a long strip, and the anode plate can be shaken by the disturbance of the smoke and wind, and the dust flakes off and is discharged from the ash discharge port below under the action of its own weight. The electrostatic precipitator formed in the dust removal area can achieve self-cleaning, without the need for a vibration device, which effectively reduces the maintenance workload of the electrostatic precipitator.

[0034] After the dust removal in the dust removal area, the flue gas continues to flow upward to the denitration area. Since the denitration catalyst has a porous structure, when the flue gas passes through the bottom catalyst layer, the denitration catalyst can block most of the dust in the flue gas on the bottom surface of the denitration catalyst. The bottom catalyst layer has a pre-dust removal function, which reduces the concentration of dust when it enters the subsequent catalyst layer, thereby avoiding the blockage and wear of the denitration catalyst in the subsequent catalyst layer, improving the denitration efficiency of the denitration area, and ensuring the stability and reliability of the denitration reaction. The dust collected on the bottom surface of the denitration catalyst can also be cleaned by using a dust cleaning device. After the dust is cleaned, it falls back to the dust removal area below for dust removal again, effectively suppressing secondary dust.

[0035] Therefore, the dust removal and denitration functions of flue gas are integrated in the integrated warehouse, and the dust removal area and the denitration area are arranged in the vertical direction. Compared with the split-type electrostatic precipitator and denitration reactor, the required floor space is small, at least reduced by more than half, saving construction land. At the same time, there is no need for elbows to connect the dust removal area and the denitration area, which reduces the number of elbows, makes the internal flow field smoother, and reduces the system operation resistance. After passing through the dust removal area, the flue gas will pass through the denitration area before being discharged from the flue gas outlet. The catalyst layer in the denitration area also has a dust removal function, and the catalyst layer is provided with a dust cleaning device to ensure that the catalyst is not blocked under a certain dust content. Therefore, the dust removal efficiency of the electrostatic precipitator is not required to be very high, and the flue gas flow rate in the integrated warehouse can be faster. On the basis of a certain total flue gas flow rate, by increasing the flue gas flow rate design, the requirements for the volume of the integrated warehouse can be reduced, thereby further reducing the floor space of the integrated warehouse. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0037] Figure 1 It is a structural schematic diagram of an integrated cement kiln dust removal and denitrification device according to a novel embodiment of the present invention.

[0038] Figure 2 It is a structural schematic diagram of an integrated cement kiln dust removal and denitrification device according to another embodiment of the present invention.

[0039] The reference numerals in the accompanying drawings are as follows: 1. Cement rotary kiln; 2. Preheater; 3. Ammonia injection device; 41. Inlet flue; 42. Outlet flue; 51. Integrated bin; 511. Flue gas outlet; 512. Flue gas inlet; 513. Ash discharge port; 514. Inlet area; 52. Rectifier; 53. Dust removal area; 531. Dust collecting electrode; 532. Corona electrode; 54. Denitrification area; 541. Catalyst layer; 542. Cleaning device; 5421. First ash cleaner; 5422. Second ash cleaner; 6. Ash discharger; 7. Waste heat boiler; 8. Fan. DETAILED DESCRIPTION

[0040] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to that described herein.

[0041] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0042] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0043] See also Figure 1The utility model provides an integrated device for dust removal and denitrification of cement kilns, which is connected to the outlet of the preheater 2 of the cement production line through an inlet flue 41, and an ammonia spraying device 3 is provided on the inlet flue 41. Specifically, the inlet of the preheater 2 is connected to the outlet of the cement rotary kiln 1 on the cement production line. After the high-temperature flue gas coming out of the cement rotary kiln 1 is heat-exchanged with the cement raw material through the preheater 2, the dust content of the high-temperature flue gas at 300 to 320°C is about 80 to 120 g / Nm3. The high-temperature and high-dust flue gas passes through the inlet flue 41, and an ammonia spraying device 3 is provided at the inlet flue 41 to spray the reducing agent required for denitrification into the inlet flue 41 and mix it evenly with the flue gas in advance.

[0044] An integrated device for dust removal and denitrification of a cement kiln provided in one embodiment of the utility model comprises an integrated bin 51 , a rectifying device 52 , a dust removal area 53 and a denitrification area 54 .

[0045] The integrated bin 51 extends vertically and is provided with a smoke outlet 511 , a smoke inlet 512 and an ash discharge port 513 arranged in sequence from top to bottom. The smoke inlet 512 is connected to the inlet flue 41 .

[0046] The rectifying device 52 is arranged in the integrated bin 51 and close to the smoke inlet 512 , and a plurality of rectifying holes are evenly distributed on the rectifying device 52 .

[0047] The dust removal zone 53 is arranged in the integrated bin 51 and above the ash discharge port 513. The dust removal zone 53 is provided with a dust collecting electrode 531 and a corona electrode 532. The dust collecting electrode 531 includes an anode frame and an anode plate connected to the anode frame. A plurality of anode frames are arranged side by side at intervals, and each anode frame is connected to a plurality of anode plates arranged side by side at intervals. The anode plates are in the shape of long strips so that the anode plates can shake under the action of airflow. The corona electrode 532 includes a cathode frame and a cathode wire connected to the cathode frame. A plurality of cathode frames are arranged side by side at intervals and are arranged in a staggered manner with the anode frame. Each cathode frame is connected to a plurality of cathode wires arranged side by side at intervals.

[0048] The denitration zone 54 is arranged in the integrated bin 51 and above the denitration zone 54. The denitration zone 54 is provided with a catalyst layer 541 and a cleaning device 542. A denitration catalyst is provided on the catalyst layer 541, and the catalyst layer 541 is provided with multiple layers at intervals above and below. The cleaning device 542 is used to clean the denitration catalyst.

[0049] The flue gas entering the integrated bin 51 from the flue gas inlet 512 passes through the rectifying device 52 , the dust removal area 53 and the denitrification area 54 in sequence and is then discharged from the flue gas outlet 511 .

[0050] Through the above structural design, since the integrated bin 51 is a vertically extending vertical structure, the floor space can be reduced.

[0051] The flue gas enters the integrated bin 51 through the flue gas inlet 512. The flue gas first passes through the rectifier 52, and the flue gas is evenly distributed through a plurality of rectifier holes evenly distributed on the rectifier 52. Then the evenly distributed flue gas passes through the dust removal area 53, which is conducive to improving the dust removal effect. A large number of negative ions will be generated near the cathode line. When the dust-containing flue gas passes through, the negative ions collide with the dust and adsorb on the surface of the dust, charging the dust. The charged dust moves toward the anode plate under the action of the electric field force, deposits on the surface of the anode plate and releases the charge. When the deposited dust reaches a certain thickness, the anode plate is in the shape of a long strip, and the anode plate is shaken by the disturbance of the smoke and wind, and the dust flakes off and is discharged from the ash discharge port 513 below under the action of its own weight. The electrostatic precipitator formed in the dust removal area 53 can achieve self-cleaning, without the need for a vibration device, effectively reducing the maintenance workload of the electrostatic precipitator. The filtration wind speed of the electrostatic precipitator is selected to be higher. Under a certain amount of flue gas treated, the floor space of the integrated dust removal and denitrification device can be relatively reduced.

[0052] The flue gas after dust removal in the dust removal area 53 continues to flow upward to the denitration area 54. Since the denitration catalyst has a porous structure, when the flue gas passes through the bottom catalyst layer 541, the denitration catalyst can block most of the dust in the flue gas at the bottom of the denitration catalyst. The bottom catalyst layer 541 has a pre-dust removal function, which reduces the concentration of dust when it enters the subsequent catalyst layer 541, thereby avoiding the blockage and wear of the denitration catalyst in the subsequent catalyst layer 541, improving the denitration efficiency of the denitration area 54, and ensuring the stability and reliability of the denitration reaction. The dust collecting on the bottom of the denitration catalyst can also be cleaned by the dust cleaning device 542. After being cleaned, the dust falls back to the dust removal area 53 below for dust removal again, effectively suppressing secondary dust.

[0053] Thus, the dust removal and denitration functions of the flue gas are integrated in the integrated warehouse 51, and the dust removal area 53 and the denitration area 54 are arranged in the vertical direction. Compared with the split-type electrostatic precipitator and denitration reactor, the required floor space is small, at least reduced by more than half, saving construction land. At the same time, there is no need for elbow connection between the dust removal area 53 and the denitration area 54, which reduces the number of elbows, makes the internal flow field smoother, and reduces the system operation resistance and the operation energy consumption. After passing through the dust removal area 53, the flue gas will pass through the denitration area 54 again before being discharged from the flue gas outlet 511, and the catalyst layer 541 of the denitration area 54 also has a dust removal function, and the catalyst layer 541 is provided with a dust cleaning device 542, which can ensure that the catalyst is not blocked under a certain dust content. Therefore, the dust removal efficiency of the dust removal area 53 is not required to be very high, and the flue gas flow rate in the integrated warehouse 51 can be faster. On the basis of a certain total flue gas flow rate, by increasing the flue gas flow rate design, the requirements for the volume of the integrated warehouse 51 can be reduced, thereby further reducing the floor space of the integrated warehouse 51.

[0054] It is worth mentioning that, unlike the conventional electrostatic precipitator with an internal wind speed of 0.5 to 1.5 m / s, the flue gas flow rate in the integrated bin 51 of the utility model can reach 3.5 to 6 m / s, so the integrated bin 51 can be designed to be smaller, with less investment and space. At the same time, compared with the split-type electrostatic precipitator and denitrification reactor, the integrated bin 51 requires fewer steel brackets and has lower investment costs.

[0055] The smoke inlet 512 is arranged at a position near the bottom of the side of the integrated bin 51. The smoke outlet 511 is arranged at the top of the integrated bin 51. The ash discharge port 513 is arranged at the bottom of the integrated bin 51. After the smoke enters the integrated bin 51 from the smoke inlet 512, it flows from bottom to top after turning. The smoke outlet 511 arranged at the top of the integrated bin 51 is more conducive to the smooth discharge of smoke, making the smoke flow field smoother. The ash discharge port 513 arranged at the bottom of the integrated bin 51 is more conducive to the discharge of dust after falling under the action of its own weight. The bottom of the integrated bin 51 is a cone structure with a large top and a small bottom. The ash discharge port 513 is arranged at the bottom of the cone structure. The cone structure is conducive to concentrating the dust at the ash discharge port 513. The cone structure can adopt an ash hopper, and the integrated bin 51 can be a bin body with an opening at the bottom, and the ash hopper is connected to the bottom opening of the integrated bin 51.

[0056] The anode plate extends vertically, that is, the anode plate extends along the direction of flue gas flow, and the anode plate produces too much resistance to the flow of flue gas. The width of the anode plate is 30mm~60mm, and the thickness is 0.1mm~1mm. Therefore, the anode plate is easy to shake under the action of smoke and wind while maintaining a certain strength. The length of the anode plate and the cathode wire can be determined according to the dust removal efficiency. One end of the anode plate is fixedly connected to the anode frame to keep the anode plate fixed on the anode frame, and the other end of the anode plate is movably connected to the anode frame. The movable connection makes the anode plate easy to swing. The movable connection method can be that a slot is provided on the anode frame, and the other end of the anode plate is inserted into the slot. The volume of the slot is larger than the volume of the end of the anode plate, which provides a movable space for the swing of the anode plate.

[0057] The installation mode of the anode frame in the integrated warehouse 51 can be welding fixation, and the cathode frame can be installed in the integrated warehouse 51 by a suspension device. A plurality of anode frames are arranged side by side and spaced along the first horizontal direction, and a plurality of anode plates in each anode frame are arranged side by side and spaced along the second horizontal direction, and the first horizontal direction and the second horizontal direction are perpendicular to each other. The arrangement of a plurality of anode frames is thus optimized, and the space in the electric field area can be more fully utilized. A plurality of anode plates in each anode frame are in a shutter-type structure as a whole. The corona electrode 532 can discharge, so the utility model does not limit the structure of the cathode frame and the cathode plate.

[0058] The rectifying device 52 is arranged horizontally and is disposed above the smoke inlet 512. The dust removal area 53 is disposed above the rectifying device 52. After being rectified by the rectifying device 52, the smoke flows upward uniformly into the dust removal area 53. The rectifying device 52 may be a rectifying grid.

[0059] The cleaning device 542 includes a first cleaning component and a second cleaning component. The first cleaning component is provided in multiple groups and is respectively arranged below each catalyst layer 541. The first cleaning component is used to clean the bottom surface of the denitration catalyst. The second cleaning component is provided in multiple groups and is respectively arranged above each catalyst layer 541. The second cleaning component is used to clean the top surface of the denitration catalyst. The first cleaning component works in stages under normal working conditions and can clean the bottom surface, i.e., the attachment surface, of the denitration catalyst. The second cleaning component works in stages under special working conditions, such as but not limited to working conditions with high dust concentration, and can clean the top surface of the denitration catalyst to ensure that the denitration catalyst will not be blocked or worn.

[0060] Each group of first dust cleaning components includes a plurality of first dust cleaners 5421. Each group of second dust cleaning components includes a plurality of second dust cleaners 5422. The first dust cleaners 5421 and the second dust cleaners 5422 can both be dust blowers, which use pneumatic blowing to clean the dust. The first dust cleaners 5421 and the second dust cleaners 5422 can also use other dust cleaners with cleaning functions as needed, such as but not limited to various forms of dust cleaners such as sonic, shock wave, rake, and pulse.

[0061] The integrated dust removal and denitrification device for the cement kiln also includes an ash discharger 6, which is used to receive dust discharged from the ash discharge port 513 and discharge the dust to the raw material warehouse to recycle the dust, reduce the production cost of cement, and avoid excessive dust accumulation at the bottom of the integrated bin 51.

[0062] The flue gas outlet 511 is connected to the inlet of the waste heat boiler 7 through the outlet flue 42. The flue gas after denitration is led to the waste heat boiler 7 for waste heat recovery.

[0063] It is understandable that, due to the high position of the entrance of the waste heat boiler 7, the flue gas of the conventional horizontal electrostatic precipitator enters horizontally, and the outlet of the electrostatic precipitator is connected to the entrance of the SCR reactor. The flue gas after denitration is led from the bottom of the SCR reactor to the entrance flue of the waste heat boiler 7 at a height of nearly 50m through an elbow. The flue is complex and tortuous, with many elbows and high resistance. The integrated warehouse 51 of the utility model integrates the dust removal area 53 and the denitration area 54, and the integrated warehouse 51 is arranged vertically. The height of the integrated warehouse 51 is relatively high, which reduces the height difference with the entrance of the waste heat boiler 7. There is no need for an elbow connection between the dust removal area 53 and the denitration area 54. The flue gas outlet 511 above the denitration area 54 has a lower height difference with the entrance of the waste heat boiler 7, which reduces the length of the connecting flue, thereby reducing the overall resistance of the system.

[0064] The outlet of the waste heat boiler 7 is connected to a fan 8, and the flue gas is transported to the raw material mill through the fan 8. The fan 8 provides a driving force for the flow of flue gas during the operation of the device. The flue gas after waste heat recovery by the waste heat boiler 7 is transported to the raw material mill for subsequent heat exchange.

[0065] See also Figure 2 , the main difference between the integrated dust removal and denitrification device for cement kilns provided in another embodiment of the utility model and the above-mentioned embodiment lies in the different settings of the flue gas inlet 512 and the setting of the rectifying device 52. Specifically, the side of the integrated bin 51 near the bottom protrudes outward to form an inlet area 514, and the flue gas inlet 512 is arranged in the inlet area 514. The rectifying device 52 is arranged vertically, and the rectifying device 52 is arranged in the inlet area 514 and on one side of the flue gas inlet 512. The lower part of the dust removal area 53 is arranged on the side of the rectifying device 52 facing away from the flue gas inlet 512, and the upper part of the dust removal area 53 is arranged above the side of the rectifying device 52 facing away from the flue gas inlet 512. After being rectified by the rectifying device 52, the flue gas flows evenly horizontally into the dust removal area 53.

[0066] That is to say, in an embodiment without the inlet area 514 , the rectifying device 52 is horizontally arranged below the dust removal area 53 , and in an embodiment with the inlet area 514 , the rectifying device 52 is vertically arranged in the inlet area 514 .

[0067] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. An integrated device for dust removal and denitrification of a cement kiln, connected to the preheater outlet of a cement production line through an inlet flue, an ammonia spraying device is provided on the inlet flue, characterized in that: The cement kiln dust removal and denitrification integrated device comprises: An integrated bin extending vertically, wherein the integrated bin is provided with a smoke outlet, a smoke inlet and an ash discharge port arranged in sequence from top to bottom, and the smoke inlet is connected to the inlet flue; A rectifying device is arranged in the integrated bin and close to the smoke inlet, and the rectifying device is evenly provided with a plurality of rectifying holes; A dust removal area is arranged in the integrated bin and above the ash discharge port, wherein the dust removal area is provided with a dust collecting electrode and a corona electrode, wherein the dust collecting electrode comprises an anode frame and an anode plate connected to the anode frame, wherein the anode frame is provided with a plurality of anode plates spaced side by side, and each of the anode frames is connected with a plurality of anode plates spaced side by side, and the anode plates are in the shape of long strips so that the anode plates can shake under the action of airflow, wherein the corona electrode comprises a cathode frame and a cathode wire connected to the cathode frame, wherein the cathode frame is provided with a plurality of cathode wires spaced side by side and staggered with the anode frame, and each of the cathode frames is connected with a plurality of cathode wires spaced side by side; A denitration zone is arranged in the integrated bin and above the dust removal zone. The denitration zone is provided with a catalyst layer and a dust cleaning device. A denitration catalyst is arranged on the catalyst layer, and multiple layers are arranged at intervals above and below the catalyst layer. The dust cleaning device is used to clean the denitration catalyst. The flue gas entering the integrated warehouse from the flue gas inlet passes through the rectifying device, the dust removal area and the denitrification area in sequence and is then discharged from the flue gas outlet.

2. The integrated device for dust removal and denitrification of cement kilns according to claim 1 is characterized in that: The smoke inlet is arranged at a position near the bottom of the side of the integrated bin; The smoke outlet is arranged at the top of the integrated bin; The ash discharge port is arranged at the bottom of the integrated bin.

3. The integrated device for dust removal and denitrification of cement kilns according to claim 2 is characterized in that: The rectifying device is arranged horizontally and is disposed above the smoke inlet; The dust removal area is arranged above the rectifying device.

4. The integrated device for dust removal and denitrification of cement kilns according to claim 2 is characterized in that: The side portion of the integrated bin protrudes outward near the bottom to form an entrance area; The smoke inlet is arranged in the inlet area; The rectifying device is arranged vertically, and is arranged in the inlet area and on one side of the smoke inlet; The lower part of the dust removal zone is arranged on the side of the rectifying device facing away from the smoke inlet, and the upper part of the dust removal zone is arranged above the side of the rectifying device facing away from the smoke inlet.

5. The integrated device for dust removal and denitrification of cement kilns according to claim 1 is characterized in that: The dust cleaning device comprises a first dust cleaning component and a second dust cleaning component; The first cleaning components are provided in multiple groups and are respectively arranged below each of the catalyst layers, and the first cleaning components are used to clean the bottom surface of the denitration catalyst; The second cleaning components are provided in multiple groups and are respectively arranged above each of the catalyst layers. The second cleaning components are used to clean the top surface of the denitration catalyst.

6. The integrated device for dust removal and denitrification of cement kilns according to claim 1, characterized in that: One end of the anode plate is fixedly connected to the anode frame; The other end of the anode plate is movably connected to the anode frame.

7. The integrated device for dust removal and denitrification of cement kilns according to claim 1, characterized in that: The cement kiln dust removal and denitrification integrated device also includes an ash discharger; The ash discharger is used to receive the dust discharged from the ash discharge port and discharge the dust to the raw material storehouse.

8. The integrated device for dust removal and denitrification of cement kilns according to claim 1, characterized in that: The flue gas outlet is connected to the inlet of the waste heat boiler through an outlet flue.

9. The integrated device for dust removal and denitrification of cement kilns according to claim 8, characterized in that: The outlet of the waste heat boiler is connected to a fan, and the smoke is transported to the raw material grinding equipment through the fan.

10. The integrated device for dust removal and denitrification of cement kilns according to claim 1, characterized in that: The anode plate extends vertically, and has a width of 30 mm to 60 mm and a thickness of 0.1 mm to 1 mm.

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