CN112870973B - Integrated flow equalizing and mixing device for SCR denitration - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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Abstract
The invention discloses an integrated flow equalizing mixing device for SCR denitration, which comprises: comprising the following steps: the support frame is internally provided with a horn-shaped flow equalizing component; the flow equalizing assembly consists of a speed reducing plate and a plurality of guide plates, wherein the speed reducing plate is in a shape of a positive n-sided polygon, and n is more than 3 and is an even number; the plurality of guide plates are arranged at intervals on the sides of the regular n-shape, so that an airflow buffer area is formed between the adjacent guide plates; the upper end of each guide plate is fixedly connected with one side of the regular n-shape, and the lower end of each guide plate is fixedly connected with the lower end of the supporting frame; the upper end of the supporting frame is detachably connected with the nozzle. The invention integrates flow equalization and mixing, realizes the homogenization of the speed field and the concentration field of the ammonia gas at the ammonia injection grid through one device, has short mixing distance, can realize the rapid mixing of the ammonia gas and the flue gas, and improves the gas-gas mixing effect and the mixing efficiency.
Description
Technical Field
The invention relates to the technical field of fluid mixing equipment, in particular to an integrated flow equalizing mixing device for SCR denitration.
Background
An important evaluation index of a Selective Catalytic Reduction (SCR) denitration process is denitration efficiency and ammonia slip, and an important factor affecting SCR denitration efficiency and ammonia slip is the mixing effect of ammonia and industrial flue gas. In order to improve the mixing effect of ammonia gas and industrial flue gas, the main means at home and abroad are as follows: increasing the number of spray holes on the ammonia injection grid and simultaneously reducing the diameter of the spray holes (see Shang Yuanjiang, wu Guojiang, zhao Liang for details, SCR denitration system ammonia injection grid optimal design [ J ]. Thermal power generation, 2013 (03): 64-68.), improving speed uniformity by adding grid blades after ammonia spraying, and improving concentration distribution uniformity by adding a mixing grid (more specifically, Gao X,Wang B,Yuan X,et al.Optimal design of selective catalyst reduction denitrification system using numerical simulation[J].Journal of Environmental Management,2019,231(FEB.1)：909-918.), ammonia spraying nozzles and baffle plates are added to form vortex enhanced mixing (more specifically, zhao Yu, lu Guangjie, liu Hanjiang and the like; flue gas denitration vortex mixer and vortex mixing method [ P ]. Chinese patent: 200810104115. X, 2009.), the SMV static mixer divides the mixed flue gas and ammonia gas into a plurality of sub-flues, the mixed gas is divided, deflected and then converged by the sub-flues to realize uniform distribution (see Naqvi, M, meyer, C.Gas-gas mixing AS APPLIED to SCR's [ C ]. NETL Conference Pittsuburgh PA, 2003.), the arrangement mode of the optimized deflector and rectifier is uniform in concentration field (see European Sword for SCR denitration reactor inlet optimization and simulation [ J ]. Chemical equipment technology, 2020, 41 (05): 43-47.), the research on the shape of the deflector before the reactor is used for increasing denitration efficiency (see Shen Dan, zhong Zhaoping, too small a power plant, 600MW for SCR flue gas denitration reactor, flow field numerical simulation of different deflector plates in the SCR denitration reactor [ J ]. Electric power environment protection, 2007 (01): 42-45. Xu Yan, li Wenyan. Structure design of deflector of the SCR denitration reactor [ J ]. Thermal power generation, 2008 (10): 49-52+54.) (96) is arranged at the ejection outlet to strengthen the mixed flue gas, huang Farui gas-gas rapid mixing research [ J ]. Petroleum journal (Petroleum processing), 1993, 009 (002): 112-118); the influence of the nozzle opening diameter and the section speed ratio on the mixing effect is explored (Feng, li Ruijiang, ni Yanhui, et al, research on gas-gas rapid mixing [ J ]. Chemical reaction engineering and process, 2003, 19 (1): 45-45.), the influence (Giorges A T G,Forney L J,Wang X.Numerical Study of Multi-Jet Mixing[J].Chemical Engineering Research&Design,2001,79(5)：515-522.), of single nozzle and multiple nozzle on the mixing effect is explored by adopting a numerical simulation method, and the influence of the injection angle, the orifice shape and the gas flow on the mixing is researched based on CFD numerical simulation (Patkar V C,Patwardhan A W.Effect of jet angle and orifice shape in gas-gas mixer using CFD[J].Chemical Engineering Research&Design,2011,89(7)：904-920.).
From the above, the measures for improving the mixing effect of ammonia and flue gas in the SCR process at home and abroad are mainly divided into two types: firstly, a flow guiding device is arranged after ammonia spraying to ensure uniform flow velocity, so that the mixing time is prolonged; the vortex mixer and the like are arranged to enhance the mixing effect; the other category is the study of structural parameters and installation parameters of the nozzles, the number of nozzles, and the like. The research on the related parameters of the nozzle can not fundamentally solve the problem of mixing uniformity; the mode of strengthening gas-gas mixing is mainly carried out by separating the speed reduction and the mixer, namely the speed reduction is carried out firstly and then the mixing is carried out, the mode tends to influence the mixing effect and the mixing efficiency, and the defects of longer mixing distance, large material consumption and the like exist in engineering application. For high-concentration NO X flue gas, the ammonia spraying amount is large, the flow rate of a single nozzle is large, the flow velocity is high, and the mixing effect is poor.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide an integrated flow equalization mixing device for SCR denitration, which integrates flow equalization and mixing, realizes the homogenization of a speed field and a concentration field of ammonia at an ammonia injection grid through one device, has short mixing distance, can realize the rapid mixing of ammonia and flue gas, improves the gas-gas mixing effect and mixing efficiency, is convenient to install, does not change the original flue structure, and has wide engineering application value.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
A mixing arrangement that flow equalizes for SCR denitration installs in the nozzle front end, and the nozzle equipartition is on spouting the ammonia main pipe of ammonia injection grid, mixing arrangement that flow equalizes includes: the support frame is internally provided with a horn-shaped flow equalizing assembly;
The flow equalizing assembly consists of a speed reducing plate and a plurality of guide plates, wherein the speed reducing plate is in a shape of a positive n-sided polygon, and n is more than 3 and is an even number; the plurality of guide plates are arranged at intervals on the sides of the regular n-shape, so that an airflow buffer area is formed between the adjacent guide plates; the upper end of each guide plate is fixedly connected with one side of the regular n-shape, and the lower end of each guide plate is fixedly connected with the lower end of the supporting frame; the upper end of the supporting frame is detachably connected with the nozzle.
The technical scheme of the invention is characterized in that:
further, the ratio of the diameters of the circumscribed circles at the bottom ends of the plurality of guide plates to the circumscribed circles of the speed reducing plates is 2:1-8:1.
Further, the ratio of the diameters of the circumscribed circles of the bottom ends of the plurality of guide plates to the circumscribed circles of the speed reducing plates is 6:1.
Further, the vertical distance between the plane of the bottom ends of the plurality of guide plates and the speed reducing plate is equal to the distance from the speed reducing plate to the outlet of the nozzle.
Further, the ratio of the distance from the outlet of the nozzle to the speed reducing plate to the diameter of the nozzle is 6:5.
Further, the speed reducing plate is in a regular dodecagon shape, the six sides of the regular dodecagon are fixedly connected with the guide plates, and the six sides are not adjacent.
Further, the support frame comprises an upper support ring, a lower support ring and a plurality of support rods arranged between the upper support ring and the lower support ring.
Further, the inner wall of the upper support ring is provided with an internal thread, the outer wall of the nozzle is provided with an external thread, and the internal thread is matched with the external thread.
Further, the integrated flow equalizing mixing device is arranged in one-to-one correspondence with the nozzles in the ammonia spraying grid.
Further, the distance between adjacent nozzles on the same ammonia injection main pipe in the ammonia injection grid is not less than ten times of the diameter of the circumscribed circle of the speed reducing plate.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, through structural design, the processes of decelerating, equalizing, mixing and the like of ammonia gas and flue gas are integrated, rapid mixing of ammonia gas and flue gas is realized at a position close to the nozzle, and the mixing effect and the mixing efficiency are improved.
(2) According to the invention, the horn-shaped flow guide path is formed by the speed reducing plate and the flow guide plates, and meanwhile, a gap is reserved between the adjacent flow guide plates, so that a buffer area is provided for mixing the air flow, the pressure loss of the air flow is relieved, and the rapid homogenization process of the flow speed and the flow field is ensured.
Drawings
The invention will now be described in further detail with reference to the drawings and to specific examples.
FIG. 1 is a schematic three-dimensional perspective view of an integrated flow equalizing mixing device installed on a nozzle according to the present invention;
FIG. 2 is a front view of an integrated flow equalizer mixing apparatus mounted on a nozzle in accordance with the present invention;
FIG. 3 is a top view of an integrated flow equalizer mixing apparatus mounted on a nozzle in accordance with the present invention;
FIG. 4 is a layout diagram of the integrated flow equalization mixing device in the ammonia injection grid;
FIG. 5 is a cloud of axial cross-sectional velocities of the tips of the nozzles of the different experimental groups (a) - (e);
FIG. 6 is a radial cross-sectional velocity cloud of the nozzle tips of different experimental groups (a) - (e);
FIG. 7 is a molar fraction cloud of ammonia in axial section of the nozzle tips of different experimental groups (a) - (e);
FIG. 8 is a radial cross-sectional ammonia mole fraction cloud of the nozzle tips of the different experimental groups (a) - (e);
FIG. 9 shows the molar concentration of ammonia relative to the standard deviation coefficients for the different experimental groups (a) - (e);
FIG. 10 is a graph showing the pressure distribution of the cross-section of the different experimental groups (b) - (e) at a distance of 0.03m from the nozzle outlet and from the cross-section at the bottom of the flow-equalizing mixer;
in fig. 1-4, 1a support frame; 101 an upper support ring; 102, supporting a rod; 103 lower support ring; 2, a speed reducing plate; 3, a guide plate; a 4 nozzle; and 5, ammonia spraying main pipe.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
Referring to fig. 1 to 4, the invention provides an integrated flow equalizing and mixing device for SCR denitration, which is installed at the front end of a nozzle 4, the nozzle 4 is uniformly distributed on an ammonia spraying main pipe 5 of an ammonia spraying grid, and the integrated flow equalizing and mixing device comprises: the device comprises a support frame 1, wherein a horn-shaped flow equalizing assembly is arranged in the support frame 1; the flow equalizing assembly consists of a speed reducing plate 2 and a plurality of guide plates 3, wherein the speed reducing plate 2 is in a shape of a positive n-side, and n is more than 3 and is an even number; the guide plates 3 are arranged at intervals on the sides of the regular n-shape, so that an airflow buffer area is formed between the adjacent guide plates 3; the upper end of each guide plate 3 is fixedly connected with one side of the regular n-shape, and the lower end of each guide plate is fixedly connected with the lower end of the support frame 1; the upper end of the supporting frame 1 is detachably connected with the nozzle 4.
In the above embodiment, according to the flow velocity distribution of the flue gas, the nozzles 4 are arranged on the ammonia spraying pipeline, and each nozzle 4 is provided with an integrated flow equalizing mixing device of the invention, as shown in fig. 4. The flue gas flows through an ammonia spraying grid in a flue, ammonia gas is mixed to flow forwards, the ammonia gas is sprayed out from a plurality of nozzles 4 uniformly distributed on an ammonia spraying main pipe 5 and sprayed onto a speed reducing plate 2, so that the flow rate of the ammonia gas is reduced and dispersed to the periphery, and a plurality of guide plates 3 which are horn-shaped along the edge of the speed reducing plate 2 are dispersed to the periphery and mixed with the flue gas moving in the same direction; the speed reducing plate 2 is in a positive n-sided shape, and n is more than 3 and is an even number; the plurality of guide plates 3 are arranged at intervals on the edge of the regular n-shape, so that an airflow buffer area is formed between the adjacent guide plates 3, the homogenization of the flow velocity and the flow field is facilitated, and the mixing effect is enhanced. According to the invention, the flow field homogenization and the mixing of ammonia gas and flue gas are integrated, the corresponding structural design is carried out through the analysis of the speed field and the flow field at the front end of the nozzle 4, and the homogenization of the speed field and the flow field is realized at a relatively short distance at the front end of the nozzle 4.
The speed reducing plate 2 of the invention can be in a plane shape or an upward arched shape, and the edge of the arched plate is in a positive n-shape. The device of the invention is fastened to the nozzle 4 by means of threads or threads.
In the embodiment of the invention, the ratio of the diameters of the circumscribed circles at the bottom ends of the plurality of guide plates 3 to the circumscribed circles of the speed reducing plate 2 is 2:1-8:1.
The ratio of the diameters of the circumcircle of the bottom ends of the guide plates 3 to the circumcircle of the speed reducing plate 2 is 6:1.
The vertical distance between the plane of the bottom ends of the plurality of guide plates 3 and the speed reducing plate 2 is equal to the distance from the speed reducing plate 2 to the outlet of the nozzle 4.
The ratio of the distance from the outlet of the nozzle 4 to the speed reduction plate 2 to the diameter of the nozzle 4 is 6:5.
Further, the speed reducing plate 2 is in a regular dodecagon shape, six sides of the regular dodecagon are fixedly connected with the guide plate 3, and the six sides are not adjacent.
Further, the support frame 1 comprises an upper support ring 101, a lower support ring 103 and a plurality of support rods 102 arranged between the upper support ring 101 and the lower support ring 103.
Further, an inner wall of the upper support ring 101 is provided with an inner thread, and an outer wall of the nozzle 4 is provided with an outer thread, and the inner thread is matched with the outer thread.
Further, the integrated flow equalizing mixing device is arranged in one-to-one correspondence with the nozzles 4 in the ammonia spraying grid.
Further, the distance between adjacent nozzles 4 on the same ammonia injection main pipe 5 in the ammonia injection grid is not less than ten times the diameter of the circumcircle of the speed reducing plate 2.
The setting of the distance parameters ensures the current sharing mixing effect of the application. The specific effect is shown in the simulation experiment part.
Simulation experiment
The comparison was made with the inventive device not being provided before the nozzle.
In the embodiment shown in fig. 2 and 3, the speed reducing plate has a regular dodecagon shape as a top surface, and 6 flow guiding plates are uniformly distributed along the circumferential direction in a horn mouth shape and are six congruent inclined trapezoids. The ratio of the diameters of the bottom end circumcircle of the different guide plates and the circumcircle of the speed reducing plate is used as different groups for testing.
The specific test parameters are as follows: the diameter of the circumcircle of the speed reducing plate is 25mm, the vertical distance between the plane of the bottom end of the guide plate and the speed reducing plate is 30mm, the length of the nozzle is 270mm, the diameter is 25mm, the distance between the nozzle outlet and the top surface of the guide vane is 30mm, the section size of the ammonia injection grid is 3m x 3m, the arrangement mode of the nozzles is 12 x 12, and the distance between the adjacent nozzles on the same ammonia delivery main pipe is at least 300mm; the experimental group was set as follows: the flow equalizing mixing device is arranged in front of the nozzles of the group serving as a comparison group, the flow equalizing mixing devices are arranged in front of the nozzles of other groups, the diameter of the bottom end circumcircle of the flow guide plate is 50mm, the diameter of the bottom end circumcircle of the flow guide plate is 100mm, the diameter of the bottom end circumcircle of the flow guide plate is 150mm, and the diameter of the bottom end circumcircle of the flow guide plate is 200mm.
The invention adopts ANSYS ICEM FLUENT to carry out grid division on the structure and adopts a structured grid to carry out numerical simulation. The standard k-epsilon equation is selected in the calculation and the Species Transport equation is opened. For the pressure-speed coupling solving aspect, a SIMPLEC algorithm is adopted; the pressure, momentum, turbulence energy and turbulence dissipation ratio adopt a first-order windward format, and the other are second-order windward formats. The residual value of each equation at the time of stopping the iterative solution should be less than 10 -3.
The following are airflow simulation parameter settings: the diameter of the flue gas pipeline is 300mm, and the length is 800mm; the diameter of the ammonia spraying main pipe is 25mm, and the length is 270mm; ammonia gas inlet speed is 18m/s, temperature is 350 ℃, component content is ammonia gas with mole fraction of 0.02 and air with mole fraction of 0.98; the air inlet speed is 2.5m/s, the temperature is 350 ℃, and the component content is all air.
In the isothermal circular section free jet process, dividing the isothermal circular section free jet process into an initial section and a main section according to the values of an outlet and an initial speed, wherein a conical area exists in the initial section, the speed of the conical area is equal to the initial speed, and the guide vane is arranged in the initial section as much as possible; in order to improve the mechanical strength of the ammonia conveying main pipe and reduce the number of the flow equalizing mixers, the flow equalizing mixers have the maximum strengthening mixing effect. The distance between adjacent nozzles on the same ammonia conveying main pipe is at least 300mm, namely the minimum distance between flow equalizing mixers is 300mm.
The relative standard deviation of the concentrations can be used to assess the mixing effect of the homogeneous mass, with smaller values indicating better mixing. X i represents the molar concentration of points on the statistical plane,Mean molar concentration on the statistical surface, σ represents concentration standard deviation, and C x represents concentration relative standard deviation. The calculation formula is as follows:
where N is the number of statistical points on the statistical plane.
Fig. 5 is an axial section velocity cloud of the front end of the nozzle of the different experimental groups. It can be seen that when the flow equalizer is not installed, the air velocity after the nozzle outlet is equal to the initial velocity in the conical region, i.e., the conical region is the initial region of the conventional injection. As can be seen from a, b, c and d in the figure, the initial zone is not present after the flow equalizer mixer is added. The comparison shows that after the gas passes through the flow equalization mixer, the gas velocity is smaller at the center and the gas velocity at the two sides is increased. And this phenomenon is more pronounced as the diameter of the guide vane increases from 100mm to 150 mm. In addition, as the diameter of the guide vane increases, the velocity of the air passing through the vane gradually decreases, but the area passing through gradually increases. And this change is more pronounced as the guide vane increases to 150 mm.
Fig. 6 is a radial cross-sectional velocity cloud of the nozzle tips of different experimental groups. In the figure, the positive direction of the y axis points to the spraying direction axially, wherein the section where y=0 is located is the plane where the speed reducing plate of the flow equalization mixer is located. It can be seen that when the gas just passes through the flow equalization mixer, the larger the area with the speed difference exists in the whole radial section along with the increase of the diameter of the circumscribing circle at the bottom end of the guide plate. That is, there is a speed difference in most areas, and the gas radial movement tends to be uniform due to the viscosity of the gas, so that the enhanced mixing is facilitated. In groups (d) and (e), the velocity difference exists except at the center, and also around it, indicating that in the subsequent movement there is also radial movement between the gases, which are still mixing.
Fig. 7 is an ammonia mole fraction cloud of axial cross-section of the nozzle tips of different experimental groups. Comparing (a) and (b) it can be seen that the concentration of ammonia in the existing calculation zone is greater in the central zone and the diffusion of ammonia along the axial distance is not significant. Along with the increase of the diameter of the circumscribing circle at the bottom end of the guide plate, the ammonia gas forms a plurality of air flows which are gradually diluted and diffused to the periphery along the axial direction, so that the mixing is enhanced; the ammonia concentration gradually tends to be uniform along the axial direction, and a good mixing effect is already formed at the outlet of the calculation domain.
Fig. 8 is a radial cross-section ammonia mole fraction cloud for the front end of the nozzle of the different experimental groups. Along with the increase of the diameter of the circumscribing circle at the bottom end of the guide plate, the distribution area of ammonia gas is gradually increased, the area is closer to the wall surface, and the mixing effect is obviously increased. Near uniformity already at the outlet.
FIG. 9 is a graph showing the molar concentration of ammonia versus standard deviation coefficient for different experimental groups. Wherein the smaller the molar concentration of ammonia relative to the standard deviation coefficient, the better the mixing effect. As can be seen from the graph, the relative standard deviation coefficient of the control group near the ammonia injection outlet is far greater than that of the flow equalization mixer provided by the invention.
FIG. 10 is a pressure distribution diagram of a section at a distance of 0.03m from the nozzle outlet and from the bottom end of the flow equalizer, where y1 is the pressure distribution diagram of a section at a distance of 0.03m from the nozzle outlet and y2 is the pressure distribution diagram of a section at a distance of 0.03m from the bottom end of the flow equalizer. As can be seen from the figure, in the four experiments (b) - (e), positive pressure exists at the ammonia inlet; as the diameter of the circumcircle at the bottom end of the guide vane increases, the pressure drop in the affected area gradually decreases, but the range of the pressure drop gradually increases. The overall pressure drop is relatively uniform and the disturbance to the guide vanes is relatively small.
By combining the results, the integrated flow equalizing and mixing device designed by the invention can realize the homogenization of the gas flow field in a shorter distance, has more uniform pressure drop and has small disturbance to the guide plate. In addition, the invention can conveniently and rapidly mount and dismount the flow equalization mixing device on the basis of not changing the structure in the flue, and has wide engineering application value.
While the invention has been described in detail in this specification with reference to the general description and the specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
1. A integration flow equalizing mixing device for SCR denitration installs in the nozzle front end, and the nozzle equipartition is on spouting the ammonia main pipe of ammonia injection grid, its characterized in that, integration flow equalizing mixing device includes: the support frame is internally provided with a horn-shaped flow equalizing assembly;
the flow equalizing assembly consists of a speed reducing plate and a plurality of guide plates, wherein the speed reducing plate is in a shape of a positive n-sided polygon, and n is more than 3 and is an even number; the plurality of guide plates are arranged at intervals on the sides of the regular n-shape, so that an airflow buffer area is formed between the adjacent guide plates; the upper end of each guide plate is fixedly connected with one side of the regular n-shape, and the lower end of each guide plate is fixedly connected with the lower end of the supporting frame; the upper end of the supporting frame is detachably connected with the nozzle;
The speed reducing plate is in a plane shape with a hole in the middle or an arch shape which is arched upwards.
2. The integrated flow equalization mixing device for SCR denitration according to claim 1, wherein the ratio of the diameters of the bottom end circumscribed circles of the plurality of guide plates to the circumscribed circles of the speed reduction plate is 2:1-8:1.
3. The integrated flow equalization mixing device for SCR denitration of claim 2, wherein the ratio of the diameter of the bottom end circumscribed circle of the plurality of baffles to the diameter of the circumscribed circle of the speed reducer is 6:1.
4. The integrated flow equalization mixing device for SCR denitration of claim 3, wherein the vertical distance between the plane of the bottom ends of the plurality of deflectors and the deceleration plate is equal to the distance from the deceleration plate to the nozzle outlet.
5. The integrated flow equalization mixing device for SCR denitration of claim 1, wherein the ratio of the distance from the outlet of the nozzle to the speed reduction plate to the diameter of the nozzle is 6:5.
6. The integrated flow equalization mixing device for SCR denitration according to claim 1, wherein the speed reducing plate is a regular dodecagon, and the six sides of the regular dodecagon are fixedly connected with the flow guiding plate, and the six sides are not adjacent.
7. The integrated flow equalization mixing device for SCR denitration of claim 1, wherein said support frame comprises an upper support ring, a lower support ring, and a plurality of support rods disposed between the upper support ring and the lower support ring.
8. The integrated flow equalization mixing device for SCR denitration according to claim 7, wherein the inner wall of the upper support ring is provided with an internal thread, the outer wall of the nozzle is provided with an external thread, and the internal thread is matched with the external thread.
9. The integrated flow equalization mixing device for SCR denitration according to any one of claims 1-8, wherein the integrated flow equalization mixing device is arranged in one-to-one correspondence with the nozzles in the ammonia injection grid.
10. The integrated flow equalization mixing device for SCR denitration according to claim 1, wherein the distance between adjacent nozzles on the same ammonia injection main pipe in the ammonia injection grid is not less than ten times the diameter of the circumscribed circle of the speed reducing plate.
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| DE19820990A1 (en) * | 1998-05-11 | 1999-11-18 | Babcock Anlagen Gmbh | Device in a plant for the reduction of nitrogen oxides |
| DE102006004069A1 (en) * | 2006-01-28 | 2007-09-06 | Fisia Babcock Environment Gmbh | Method and device for mixing a fluid with a large gas flow rate |
| CN2936409Y (en) * | 2006-07-24 | 2007-08-22 | 李长康 | Super-filter water purifier |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214635436U (en) * | 2021-02-02 | 2021-11-09 | 中国启源工程设计研究院有限公司 | Integrated flow equalizing and mixing device for SCR denitration |
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