CN217392026U - Cement kiln deNOx systems SCR reactor entry flue gas flow straightener - Google Patents
Cement kiln deNOx systems SCR reactor entry flue gas flow straightener Download PDFInfo
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Abstract
The utility model discloses a cement kiln deNOx systems SCR reactor entry flue gas flow straightener belongs to atmosphere environmental protection cement trade flue gas and handles energy saving and emission reduction technical field, cement kiln deNOx systems SCR reactor entry flue gas flow straightener gathers gas device, circle becomes square flue connecting device, the four prismoid form casings of flow straightener, the one-level flue gas diffusion water conservancy diversion crown plate grid that flow equalizes, subregion trompil flue gas equipartition board, the second grade flue gas diffusion water conservancy diversion crown plate grid that flow equalizes constitutes by the venturi, this device can realize cement kiln furnace flue gas quick even diffusion in the reducing expansion section at the limited exhaust-heat boiler export flue of space dimension and SCR reactor flue connection position, effectively improve flue gas flow field distribution homogeneity in the catalyst flue, avoid the long-pending grey phenomenon of catalyst wearing and tearing, effectively improve SCR deNOx systems's denitration efficiency.
Description
Technical Field
The patent of the utility model relates to an energy saving and emission reduction technical field is handled to atmosphere environmental protection trade, cement trade flue gas, concretely relates to can effectively improve cement kiln SCR denitrification facility reactor flue gas flow field distribution homogeneity, improve denitration reaction efficiency, install the flue gas flow straightener at cement kiln denitrification facility SCR reactor entry.
Background
NOx is a serious atmospheric pollutant, a cement kiln can discharge a large amount of nitrogen oxides in the production and processing process of the cement industry, the problems of greenhouse effect, acid rain and the like can be caused if the cement kiln can not be strictly controlled, the existing discharge problem of the nitrogen oxides and the ecological environment conflict are increasingly severe, and the problem of denitration of discharged flue gas is urgently solved, so that a stricter flue gas discharge standard is developed for the countries of the cement industry, for example, the discharge concentration of the NOx of the flue gas of the cement kiln in 2025 years in Zhejiang province is required to be less than 50mg/Nm 3 The environmental protection ministry promulgates the technical guideline for emergency emission reduction of the electricity industry in heavily polluted weather, and requires that cement production enterprises adopt SNCR, SCR and other environmental protection technologies to achieve ultralow emission, and meanwhile, the consumption of ammonia water of cement clinker per ton is less than 4KG, so that the cement clinker can be regarded as class A enterprises to enjoy corresponding preferential policies.
SCR is the English abbreviation of the English Selective Catalytic Reduction, namely the Selective Catalytic Reduction technology, and the SCR denitration technology can reduce NOx in the flue gas into N through an amino reducing agent at lower working condition temperature 2 Has high denitration efficiency and can control the escape of ammonia to be 5mg/Nm 3 The method has the advantages that the method can be divided into high-temperature arrangement and medium-low-temperature arrangement according to different forms of cement kiln flue gas SCR denitration, wherein the medium-low-temperature arrangement is used for guiding the flue gas of the waste heat boiler to the SCR reactor, and compared with the high-temperature arrangement, the medium-low-temperature arrangement is used for the flue gas of the waste heat boilerThe low-temperature process layout working condition has the advantages of small flue gas amount, small catalyst consumption, small size of the SCR reactor tower, low construction investment and the like, so that the medium and low-temperature flue gas SCR denitration catalyst technology is widely applied to cement kiln denitration engineering.
However, in consideration of the difference between the actual situation of the cement kiln flue gas and the flue gas of the coal-fired boiler, the cement kiln flue gas has the situation of smaller flue gas amount and larger ash content, so the cement kiln exhaust-heat boiler lead-out flue generally adopts a circular flue with smaller diameter, and when the exhaust-heat boiler outlet flue is connected with the flue of the SCR reactor with larger cross-sectional area, a reducing expansion structure from the flue with small cross section to the flue with large cross section exists, and the reducing expansion structure space often cannot meet the effect of uniform diffusion of the flue gas due to the limitation of the space structure of the engineering field, so that a series of problems of non-uniform diffusion distribution of the flue gas flow field, abrasion of the central area of the catalyst, dust accumulation around the catalyst and the like exist when the flue gas enters the catalyst section from the exhaust-heat boiler outlet flue in the actual operation of the engineering, and the denitration efficiency of the whole SCR denitration reactor is influenced.
Therefore, the inlet flue gas flow equalizing device of the cement kiln denitration system SCR reactor is high in reliability and simple in structure, can realize rapid uniform diffusion of flue gas in a reducing expansion section connected with an SCR flue of a waste heat boiler outlet flue in a limited space, avoids the phenomena of catalyst abrasion and dust deposition caused by uneven distribution of a flue gas flow field, improves the distribution uniformity of the flue gas flow field, and finally improves the SCR reaction efficiency, and therefore the inlet flue gas flow equalizing device of the cement kiln denitration system SCR reactor becomes a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
An object of the utility model is to provide a cement kiln deNOx systems SCR reactor entry flue gas flow straightener, its simple structure is reasonable reliable, can realize that the cement kiln flue gas is quick evenly spread in the reducing expansion section at the limited exhaust-heat boiler export flue of space dimension and SCR flue connection position, avoid catalyst wearing and tearing deposition phenomenon, improve flue gas flow field distribution homogeneity to finally improve cement kiln SCR deNOx systems's denitration efficiency.
In order to achieve the purpose, the utility model adopts the following technical scheme.
The utility model provides a cement kiln deNOx systems SCR reactor entry flue gas flow straightener which characterized in that: the flue gas flow equalizing device at the inlet of the SCR reactor of the cement kiln denitration system consists of a Venturi gas gathering device, a round square flue connecting device, a flow equalizing device quadrangular frustum-shaped shell, a primary flue gas flow equalizing and diffusing guide ring plate grid, a subarea perforated flue gas uniform distribution plate and a secondary flue gas flow equalizing and diffusing guide ring plate grid, the inlet of the Venturi gas gathering device is connected with the circular flue at the outlet of the waste heat boiler, the circular inlet of the circular square flue connecting device is connected with the outlet of the Venturi gas gathering device, the rectangular outlet of the round-to-square flue connecting device is connected with the upper top surface of the quadrangular frustum pyramid shaped shell of the flow equalizing device, the primary flue gas flow equalizing, diffusing and guiding ring plate grid, the partitioned perforated flue gas uniform distribution plate and the secondary flue gas flow equalizing, diffusing and guiding ring plate grid are sequentially and horizontally arranged in the quadrangular frustum-shaped shell of the flow equalizing device along the flow direction of the flue gas, the lower bottom surface of the quadrangular frustum pyramid shaped shell of the flow equalizing device is connected with an inlet of an SCR catalyst reactor of the denitration device.
The height of the Venturi gas gathering device is equal to the diameter D of the circular flue at the outlet of the waste heat boiler, and the hyperbolic shape of the inner wall of the Venturi gas gathering device conforms to the formula: 10x 2 -6y 2 =1.2D 2 In the formula, the center of a shell of the Venturi throttling device is taken as an original point, a middle shaft of the inner wall is taken as a y axis, and the radial direction passing through the original point and the y axis is taken as an x axis.
The height of the circular-to-square flue connecting device is 0.5-1 times of the diameter of the circular flue at the outlet of the waste heat boiler.
The height of the quadrangular frustum pyramid shaped shell of the flow equalizing device is more than or equal to the diameter size of the circular flue at the outlet of the waste heat boiler.
The primary flue gas flow equalizing, diffusing and guiding ring plate grid is arranged on the upper top surface inlet horizontal section of the flow equalizing device quadrangular frustum-shaped shell, the height dimension of the primary flue gas flow equalizing, diffusing and guiding ring plate grid is more than or equal to 350mm, the primary flue gas flow equalizing, diffusing and guiding ring plate grid is composed of N primary expansion ring plates, primary X-shaped cross supporting plates and primary central flue gas flow equalizing plates, the number N of the primary expansion ring plates is more than or equal to 3, the sizes of the inlet cross sections of the N primary expansion ring plates are sequentially increased from the center to the outer ring, the N primary expansion ring plates are sequentially and coaxially nested and uniformly distributed on the same horizontal section from small to large by taking the axis of the flow equalizing device quadrangular frustum-shaped shell as the center, the expansion direction of the primary expansion ring plates is expansion deflection along the flue gas flowing direction, and the expansion angle of the primary expansion ring plates is more than or equal to the expansion angle of the flow equalizing device quadrangular frustum-shaped shell, the N primary expansion ring plates are connected through diagonals of primary X-shaped cross supporting plates, the primary X-shaped cross supporting plates and the axle center of a quadrangular frustum pyramid-shaped shell of the flow equalizing device are coaxially arranged at the center, the primary central flue gas flow equalizing plate is arranged at the center of a primary flue gas flow equalizing, diffusing and guiding ring plate grid, the area of the primary central flue gas flow equalizing plate is smaller than the size of the cross section of an inlet of the primary expansion ring plates, and the aperture ratio of the primary central flue gas flow equalizing plate is selected to be 35% -45%.
The second-stage flue gas flow equalizing, diffusing and guiding ring plate grid is arranged on the horizontal cross section in front of the lower bottom outlet position of a flow equalizing device quadrangular frustum pyramid-shaped shell at the downstream of the first-stage flue gas flow equalizing, diffusing and guiding ring plate grid, the height dimension of the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid is less than or equal to that of the first-stage flue gas flow equalizing and diffusing guiding ring plate grid, the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid consists of M second-stage expansion ring plates, a second-stage X-shaped cross supporting plate and a second-stage central flue gas flow equalizing plate, the number M of the second-stage expansion ring plates is more than or equal to 2 times of the number N of the first-stage expansion ring plates, the size of the inlet cross section of the M second-stage expansion ring plates is sequentially increased from the center to the outer ring, and the M second-stage expansion ring plates are sequentially coaxially nested and uniformly distributed on the same horizontal cross section from small to large by taking the axis of the flow equalizing device quadrangular frustum-shaped shell as the center, the expansion direction of the second-stage expansion ring plate is expansion deflection along the smoke flowing direction, the expansion angle of the second-stage expansion ring plate is larger than or equal to that of a flow equalizing device quadrangular frustum pyramid shaped shell, M second-stage expansion ring plates are connected through a second-stage X-shaped cross support plate diagonal line, the second-stage X-shaped cross support plate and the flow equalizing device quadrangular frustum pyramid shaped shell are coaxially arranged in the center, the second-stage central smoke flow equalizing plate is arranged at the center of a second-stage smoke flow equalizing diffusion guide ring plate grid, the area of the second-stage central smoke flow equalizing plate is smaller than the size of an inlet cross section of the second-stage expansion ring plate, and the aperture ratio of the second-stage central smoke flow equalizing plate is selected within the range of 35% -45%.
The subregion trompil flue gas equipartition board is arranged in the one-level flue gas and is flow equalized diffusion water conservancy diversion crown plate grid low reaches and the second grade flue gas and flow equalized diffusion water conservancy diversion crown plate grid between the upper reaches, subregion trompil flue gas equipartition board divide into central rectangle orifice plate, middle rectangle annular orifice plate and outer lane rectangle annular orifice plate three region according to the difference of percent opening from the center to the outer lane, the percent opening of central rectangle orifice plate is less than middle rectangle annular orifice plate percent opening, middle rectangle annular orifice plate percent opening is less than the percent opening of outer lane rectangle annular orifice plate.
Compared with the prior art, the utility model discloses a have following advantage:
1. the flow field distribution uniformity of the flue gas in the cement kiln denitration device is improved;
2. the denitration efficiency of the cement kiln denitration SCR reactor is improved;
3. the phenomena of dust deposition and abrasion of the SCR catalyst layer are avoided;
4. the structure is simple and reliable, and the generated system resistance is small.
Drawings
Figure 1 is the utility model discloses a, cement kiln denitration SCR reactor entry flue gas flow straightener mounted position schematic diagram.
Figure 2 is the utility model discloses a, cement kiln denitration SCR reactor entry flue gas flow straightener structural schematic diagram.
Figure 3 is the utility model discloses a, one-level flue gas diffusion water conservancy diversion crown plate grid structure schematic diagram that flow equalizes.
Figure 4 is the utility model discloses a, subregion trompil flue gas equipartition board structure schematic diagram.
Figure 5 is the utility model discloses a, second grade flue gas diffusion water conservancy diversion crown plate grid structure schematic diagram that flow equalizes.
In the figure: 100. the denitration device comprises a waste heat boiler outlet circular flue, 200. a cement kiln denitration SCR reactor inlet flue gas flow equalizing device, 210. a Venturi gas collecting device, 220. a circular square flue connecting device, 230. a flow equalizing device quadrangular frustum-shaped shell, 240. a first-stage flue gas flow equalizing, diffusing and guiding annular plate grid, 241. a first-stage expanding annular plate, 242. a first-stage X-shaped cross supporting plate, 243. a first-stage central flue gas flow equalizing plate, 250. a partition perforated flue gas distribution plate, 251. a central rectangular orifice plate, 252. a middle rectangular annular orifice plate, 253. an outer ring rectangular annular orifice plate, 260. a second-stage flue gas flow equalizing, diffusing and guiding annular plate grid, 261. a second-stage expanding annular plate, 262. a second-stage X-shaped cross supporting plate, 263. a second-stage central flue gas flow equalizing plate, 300. a denitration device SCR catalyst reactor.
Detailed Description
The following detailed description of the present invention is made with reference to the accompanying drawings and examples:
the positional relationships described in the present invention, such as "front", "rear", "upper", "lower", "left", "right", "center", "vertical", "horizontal", and the like, are positional relationships based on the orientation shown in the drawings, and are merely for convenience of description and simplification of the present invention, and are not intended to indicate a specific orientation that a device or apparatus must have, and therefore should not be construed as limiting the present invention.
An object of the utility model is to provide a cement kiln deNOx systems SCR reactor entry flue gas flow straightener, its simple structure is reasonable reliable, can realize that the flue gas is quick even diffusion in the reducing expansion section at the limited exhaust-heat boiler export flue of space dimension and SCR flue connection position, avoid catalyst wearing and tearing deposition phenomenon, improve flue gas flow field distribution homogeneity to finally improve the denitration efficiency of cement kiln deNOx systems ware.
In order to achieve the purpose, the utility model adopts the following technical scheme.
As shown in fig. 1-2: the utility model provides a cement kiln deNOx systems SCR reactor entry flue gas flow straightener 200 which characterized in that: the inlet flue gas flow equalizing device 200 of the cement kiln denitration system SCR reactor consists of a Venturi gas gathering device 210, a circular-to-square flue connecting device 220, a flow equalizing device quadrangular frustum-shaped shell 230, a primary flue gas flow equalizing and diffusing guide ring plate grid 240, a zoning hole-opening flue gas distribution plate 250 and a secondary flue gas flow equalizing and diffusing guide ring plate grid 260, wherein the inlet of the Venturi gas gathering device 210 is connected with the circular flue 100 at the outlet of the waste heat boiler, the circular inlet of the circular-to-square flue connecting device 220 is connected with the outlet of the Venturi gas gathering device 210, the rectangular outlet of the circular-to-square flue connecting device 220 is connected with the upper top surface of the flow equalizing device quadrangular frustum-shaped shell 230, the primary flue gas flow equalizing and diffusing guide ring plate grid 240, the zoning hole-opening flue gas distribution plate 250 and the secondary flue gas flow equalizing and diffusing guide ring plate grid 260 are sequentially and horizontally arranged in the flow equalizing device quadrangular frustum-shaped shell 230 along the flue gas flow direction, the bottom surface of the flow straightener quadrangular frustum pyramid shaped housing 230 is connected with the inlet of the denitration device SCR catalyst reactor 300.
As shown in fig. 2: the height of the venturi gas gathering device 210 is equal to the diameter D of the circular flue 100 at the outlet of the waste heat boiler, and the hyperbolic shape of the inner wall of the venturi gas gathering device 210 meets the formula: 10x 2 -6y 2 =1.2D 2 In the test, the center of the shell of the venturi throttling device 210 is taken as an origin, the central axis of the inner wall is taken as a y axis, and the radial direction passing through the origin and the y axis is taken as an x axis.
As shown in fig. 2: the height of the circular-to-square flue connecting device 220 is 0.5-1 times of the diameter of the circular flue 100 at the outlet of the waste heat boiler.
As shown in fig. 2: the height of the flow equalizing device quadrangular frustum pyramid shaped shell 230 is more than or equal to the diameter size of the circular flue 100 at the outlet of the waste heat boiler.
As shown in fig. 2-3: the first-stage flue gas flow equalizing, diffusing and guiding ring plate grid 240 is arranged on the upper top surface inlet horizontal section of the flow equalizing device quadrangular frustum-shaped shell 230, the height dimension of the first-stage flue gas flow equalizing, diffusing and guiding ring plate grid 240 is greater than or equal to 350mm, the first-stage flue gas flow equalizing, diffusing and guiding ring plate grid 240 is composed of N first-stage expansion ring plates 241, first-stage X-shaped cross support plates 242 and first-stage central flue gas flow equalizing plates 243, the number N of the first-stage expansion ring plates 241 is greater than or equal to 3, the sizes of the inlet cross sections of the N first-stage expansion ring plates 241 are sequentially increased from the center to the outer ring, the N first-stage expansion ring plates 241 are sequentially and coaxially nested and uniformly distributed on the same horizontal section from small to large by taking the axis of the flow equalizing device quadrangular frustum-shaped shell 230 as the center, the expansion direction of the first-stage expansion ring plates 241 is expansion and deflection along the flue gas flow direction, the expansion angle of the first-stage expansion ring plates 241 is greater than or equal to the expansion angle of the flow equalizing device quadrangular frustum-shaped shell 230, the N primary expansion ring plates 241 are connected diagonally through primary X-shaped cross support plates 242, the primary X-shaped cross support plates 242 are coaxially arranged with the axis of the flow equalizing device quadrangular frustum pyramid-shaped shell 230 as the center, the primary central flue gas flow equalizing plate 243 is arranged at the center of the primary flue gas flow equalizing diffusion guide ring plate grid 240, the area of the primary central flue gas flow equalizing plate 243 is smaller than the size of the cross section of the inlet of the primary expansion ring plates 241, and the aperture ratio of the primary central flue gas flow equalizing plate 243 is selected to be 35% -45%.
As shown in fig. 2 and 5: the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid 260 is arranged on the horizontal cross section in front of the outlet position of the lower bottom surface of the quadrangular frustum pyramid-shaped shell 230 of the flow equalizing device at the downstream of the first-stage flue gas flow equalizing, diffusing and guiding ring plate grid 240, the height dimension of the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid 260 is less than or equal to the height dimension of the first-stage flue gas flow equalizing, diffusing and guiding ring plate grid 240, the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid 260 is composed of M second-stage expanding ring plates 261, a second-stage X-shaped cross support plate 262 and a second-stage central flue gas flow equalizing plate 263, the number M of the second-stage expanding ring plates 261 is more than or equal to 2 times of the number N of the first-stage expanding ring plates 241, the size of the inlet cross section of the M second-stage expanding ring plates 261 is sequentially increased from the center to the outer ring, the M second-stage expanding ring plates 261 are sequentially and coaxially and uniformly distributed on the same horizontal cross section from small to large by taking the axis of the flow equalizing device quadrangular frustum-shaped shell 230 as the center, the expansion direction of the second-stage expansion annular plate 261 is expansion deflection along the flow direction of flue gas, the expansion angle of the second-stage expansion annular plate 261 is larger than or equal to the expansion angle of the flow equalizing device quadrangular frustum pyramid shaped shell 230, the M second-stage expansion annular plates 261 are connected through the diagonal line of the second-stage X-shaped cross support plate 262, the second-stage X-shaped cross support plate 262 and the flow equalizing device quadrangular frustum pyramid shaped shell 230 are coaxially arranged in the center, the second-stage central flue gas flow equalizing plate 263 is arranged in the center of the second-stage flue gas flow equalizing diffusion guide annular plate grid 260, the area of the second-stage central flue gas flow equalizing plate 263 is smaller than the size of the inlet cross section of the second-stage expansion annular plate 261, and the aperture ratio of the second-stage central flue gas flow equalizing plate 263 is selected within the range of 35% -45%.
As shown in fig. 2 and 4: the partitioned perforated flue gas uniform distribution plate 250 is arranged in a region between the downstream of the first-stage flue gas uniform flow diffusion guide ring plate grid 240 and the upstream of the second-stage flue gas uniform flow diffusion guide ring plate grid 260, the partitioned perforated flue gas uniform distribution plate 250 is divided into three regions, namely a central rectangular pore plate 251, a middle rectangular annular pore plate 252 and an outer-ring rectangular annular pore plate 253 from the center to the outer ring according to different opening rates, the opening rate of the central rectangular pore plate 251 is smaller than that of the middle rectangular annular pore plate 252, and the opening rate of the middle rectangular annular pore plate 252 is smaller than that of the outer-ring rectangular annular pore plate 253.
Example (b):
the engineering is reformed transform to Tianjin cement kiln nitrogen oxide ultralow emission SCR system, and this cement kiln designs novel dry process cement production line of productivity 2000t/d, and this project transformation scope includes: increase SCR denitrification facility between refuting interface to high temperature fan entry flue from exhaust-heat boiler outlet flue refutes the interface, for realizing the requirement of the ultralow emission of nitrogen oxide, the SCR reactor is arranged behind exhaust-heat boiler, before the high temperature fan, the SCR catalyst adopts sound wave + harrow formula combination to blow the ash mode, the SCR system is equipped with the bypass, ammonia escape is not more than 5mg/Nm 3 。
After project transformation, flue gas is guided into a flue gas flow equalizing device 200 at the inlet of a cement kiln denitration system SCR reactor from a circular flue 100 at the outlet of a cement kiln waste heat boiler, flue gas bias flow generated by an elbow in the circular flue 100 at the outlet of the cement kiln waste heat boiler is eliminated under the action of a Venturi gas gathering device 210, then the connection of the small cross section of the circular flue at the outlet of the cement kiln waste heat boiler and a flue with a rectangular large cross section of a denitration device SCR catalyst reactor 300 is completed under the action of a circular square flue connecting device 220 and a flow equalizing device quadrangular frustum-shaped shell 230, flue gas uniformly enters the denitration device catalyst reactor 300 after being uniformly diffused in the flow equalizing device quadrangular frustum-shaped shell 230 under the diffusion and flow equalizing action of a first-stage flue gas flow equalizing diffusion guide plate grid 240, a subarea-opening flue gas uniform distribution plate 250 and a second-stage flue gas flow equalizing diffusion guide plate grid 260, the flue gas reaches the denitration device catalyst reactor 300, the uniformity degree of the speed distribution Cv of a first-layer catalyst is less than 15%, the temperature deviation is less than +/-10 ℃, the concentration distribution uniformity Cv of the reducing agent in the flue gas is less than 5%, and all technical indexes of a cement kiln denitration flue gas flow field can meet the technical requirements.
This device, its simple structure is reasonable reliable, leads to can realize that the flue gas is quick even diffusion, avoids catalyst wearing and tearing deposition phenomenon, improvement flue gas flow field distribution homogeneity in the reducing expansion section that exhaust-heat boiler outlet flue and SCR flue are connected limited space dimension, can effectively improve cement kiln SCR denitration reactor's denitration efficiency.
The above detailed description of one embodiment of the present invention is only for the purpose of describing the preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All simple modifications, equivalent changes and modifications made within the scope of the claims of the present invention should be within the scope of the patent of the present invention.
Claims (7)
1. The utility model provides a cement kiln deNOx systems SCR reactor entry flue gas flow straightener which characterized in that: the flue gas flow equalizing device at the inlet of the SCR reactor of the cement kiln denitration system consists of a Venturi gas gathering device, a round square flue connecting device, a flow equalizing device quadrangular frustum-shaped shell, a primary flue gas flow equalizing and diffusing guide ring plate grid, a subarea perforated flue gas uniform distribution plate and a secondary flue gas flow equalizing and diffusing guide ring plate grid, the inlet of the Venturi gas gathering device is connected with the circular flue of the outlet of the waste heat boiler, the circular inlet of the circular-to-square flue connecting device is connected with the outlet of the Venturi gas gathering device, the rectangular outlet of the round-to-square flue connecting device is connected with the upper top surface of the quadrangular frustum pyramid shaped shell of the flow equalizing device, the primary flue gas flow equalizing, diffusing and guiding ring plate grid, the partitioned perforated flue gas uniform distribution plate and the secondary flue gas flow equalizing, diffusing and guiding ring plate grid are sequentially and horizontally arranged in the quadrangular frustum-shaped shell of the flow equalizing device along the flow direction of the flue gas, the lower bottom surface of the quadrangular frustum pyramid-shaped shell of the flow equalizing device is connected with an inlet of the SCR catalyst reactor of the denitration device.
2. The cement kiln denitration system SCR reactor inlet flue gas flow equalizing device of claim 1, which is characterized in that: the height of the Venturi gas gathering device is equal to the diameter D of the circular flue at the outlet of the waste heat boiler, and the hyperbolic shape of the inner wall of the Venturi gas gathering device conforms to the formula: 10x 2 -6y 2 =1.2D 2 In the formula, the center of a shell of the Venturi throttling device is taken as an original point, a middle shaft of the inner wall is taken as a y-axis, and the direction which passes through the original point and is perpendicular to the y-axis is taken as an x-axis.
3. The cement kiln denitration system SCR reactor inlet flue gas flow equalizing device of claim 1, characterized in that: the height of the circular-to-square flue connecting device is 0.5-1 times of the diameter of the circular flue at the outlet of the waste heat boiler.
4. The cement kiln denitration system SCR reactor inlet flue gas flow equalizing device of claim 1, characterized in that: the height of the quadrangular frustum pyramid shaped shell of the flow equalizing device is larger than or equal to the diameter size of the circular flue at the outlet of the waste heat boiler.
5. The cement kiln denitration system SCR reactor inlet flue gas flow equalizing device of claim 1, characterized in that: the primary flue gas flow equalizing, diffusing and guiding ring plate grid is arranged on the upper top surface inlet horizontal section of a flow equalizing device quadrangular frustum-shaped shell, the height dimension of the primary flue gas flow equalizing, diffusing and guiding ring plate grid is more than or equal to 350mm, the primary flue gas flow equalizing, diffusing and guiding ring plate grid consists of N primary expansion ring plates, a primary X-shaped cross support plate and a primary central flue gas flow equalizing plate, the number N of the primary expansion ring plates is more than or equal to 3, the sizes of the inlet cross sections of the N primary expansion ring plates are sequentially increased from the center to the outer ring, the N primary expansion ring plates are sequentially coaxially nested and uniformly distributed on the same horizontal section from small to large by taking the axis of the flow equalizing device quadrangular frustum-shaped shell as the center, the expansion direction of the primary expansion ring plates is expanded and deflected along the flow direction of flue gas, and the expansion angle of the primary expansion ring plates is more than or equal to the expansion angle of the flow equalizing device quadrangular frustum-shaped shell, the N primary expansion ring plates are connected through diagonals of primary X-shaped cross supporting plates, the primary X-shaped cross supporting plates and the axle center of a quadrangular frustum pyramid-shaped shell of the flow equalizing device are coaxially arranged at the center, the primary central flue gas flow equalizing plate is arranged at the center of a primary flue gas flow equalizing, diffusing and guiding ring plate grid, the area of the primary central flue gas flow equalizing plate is smaller than the size of the cross section of an inlet of the primary expansion ring plates, and the aperture ratio of the primary central flue gas flow equalizing plate is selected to be 35% -45%.
6. The cement kiln denitration system SCR reactor inlet flue gas flow equalizing device of claim 1, characterized in that: the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid is arranged on the horizontal cross section in front of the lower bottom outlet position of a flow equalizing device quadrangular frustum pyramid-shaped shell at the downstream of the first-stage flue gas flow equalizing, diffusing and guiding ring plate grid, the height dimension of the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid is less than or equal to that of the first-stage flue gas flow equalizing and diffusing guiding ring plate grid, the second-stage flue gas flow equalizing, diffusing and guiding ring plate grid consists of M second-stage expansion ring plates, a second-stage X-shaped cross supporting plate and a second-stage central flue gas flow equalizing plate, the number M of the second-stage expansion ring plates is more than or equal to 2 times of the number N of the first-stage expansion ring plates, the size of the inlet cross section of the M second-stage expansion ring plates is sequentially increased from the center to the outer ring, and the M second-stage expansion ring plates are sequentially coaxially nested and uniformly distributed on the same horizontal cross section from small to large by taking the axis of the flow equalizing device quadrangular frustum-shaped shell as the center, the expansion direction of the second-stage expansion ring plate is expansion deflection along the smoke flowing direction, the expansion angle of the second-stage expansion ring plate is larger than or equal to that of a flow equalizing device quadrangular frustum pyramid shaped shell, M second-stage expansion ring plates are connected through a second-stage X-shaped cross support plate diagonal line, the second-stage X-shaped cross support plate and the flow equalizing device quadrangular frustum pyramid shaped shell are coaxially arranged in the center, the second-stage central smoke flow equalizing plate is arranged at the center of a second-stage smoke flow equalizing diffusion guide ring plate grid, the area of the second-stage central smoke flow equalizing plate is smaller than the size of an inlet cross section of the second-stage expansion ring plate, and the aperture ratio of the second-stage central smoke flow equalizing plate is selected within the range of 35% -45%.
7. The cement kiln denitration system SCR reactor inlet flue gas flow equalizing device of claim 1, characterized in that: the subregion trompil flue gas equipartition board is arranged in the one-level flue gas and is flow equalized diffusion water conservancy diversion crown plate grid low reaches and the second grade flue gas and flow equalized diffusion water conservancy diversion crown plate grid between the upper reaches, subregion trompil flue gas equipartition board divide into central rectangle orifice plate, middle rectangle annular orifice plate and outer lane rectangle annular orifice plate three region according to the difference of percent opening from the center to the outer lane, the percent opening of central rectangle orifice plate is less than middle rectangle annular orifice plate percent opening, middle rectangle annular orifice plate percent opening is less than the percent opening of outer lane rectangle annular orifice plate.
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| CN202220888644.9U CN217392026U (en) | 2022-04-18 | 2022-04-18 | Cement kiln deNOx systems SCR reactor entry flue gas flow straightener |
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| CN202220888644.9U CN217392026U (en) | 2022-04-18 | 2022-04-18 | Cement kiln deNOx systems SCR reactor entry flue gas flow straightener |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115364666A (en) * | 2022-10-10 | 2022-11-22 | 北京博奇电力科技有限公司 | Circulating mixing and ash removing system for injecting multi-component flue gas by SCR (Selective catalytic reduction) denitration reducing agent of cement kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115364666A (en) * | 2022-10-10 | 2022-11-22 | 北京博奇电力科技有限公司 | Circulating mixing and ash removing system for injecting multi-component flue gas by SCR (Selective catalytic reduction) denitration reducing agent of cement kiln |
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