CN111027207A - Method for visualizing abrasion of guide plate of SCR (Selective catalytic reduction) denitration system - Google Patents
Method for visualizing abrasion of guide plate of SCR (Selective catalytic reduction) denitration system Download PDFInfo
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- CN111027207A CN111027207A CN201911251498.8A CN201911251498A CN111027207A CN 111027207 A CN111027207 A CN 111027207A CN 201911251498 A CN201911251498 A CN 201911251498A CN 111027207 A CN111027207 A CN 111027207A
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- 238000005299 abrasion Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010531 catalytic reduction reaction Methods 0.000 title abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 132
- 239000000428 dust Substances 0.000 claims abstract description 81
- 230000003628 erosive effect Effects 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003546 flue gas Substances 0.000 claims abstract description 22
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 230000003116 impacting effect Effects 0.000 claims abstract description 5
- 230000005484 gravity Effects 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 13
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000007794 visualization technique Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a method for visualizing abrasion of a guide plate of an SCR (selective catalytic reduction) denitration system, which comprises the following steps of: step 1, establishing a particle tracing model to obtain a running track of dust particles in flue gas; step 2, establishing a particle abrasion model to obtain particle-metal contact erosion quantity of dust particles impacting a guide plate, a flow-guiding gate, a catalyst layer and a blade area; and 3, visually displaying the running track of the dust particles in the flue gas and the particle-metal contact erosion amount to quantitatively evaluate the wear degree of the guide plate, the rectifying grid, the catalyst layer and the blade area. The invention can quantitatively display and evaluate the erosion abrasion degree of the guide plate and the rectifier grid in the SCR denitration system.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a method for visualizing abrasion of a guide plate of an SCR (selective catalytic reduction) denitration system.
Background
The thermal power generating unit boiler burns and produces nitrogen oxide NOx and exceeds the standard, installs SCR deNOx systems additional behind the boiler economizer and carries out the desorption to NOx in the flue gas. And an ammonia spraying branch pipe in the SCR denitration reactor sprays diluted ammonia gas and mixes the diluted ammonia gas with flue gas, the mixed gas flows through a catalyst layer to perform a chemical reaction, and nitrogen oxides NOx are removed. Because the SCR denitration reactor runner is tortuous complicated, need dispose guide plate group and dredge the drainage to flue gas flow, reduce the flow loss that the flue gas flow disorder arouses. The density of dust particles in the flue gas is different from that of the flue gas, and the aerodynamic characteristics are different from each other. The density and inertia of dust particles are large, the flow characteristics of the dust particles following the flue gas in the areas of flue gas flow change direction and contraction expansion are poor, and the dust particles are easy to impact on a guide plate group, a flow straightener and a catalyst to cause serious abrasion loss. Therefore, the abrasion conditions of the areas such as the guide plate, the rectifying grid and the catalyst are accurately predicted, and the countermeasure can be carried out in advance to prevent the SCR denitration system from being invalid.
Disclosure of Invention
The invention aims to provide a method for visualizing the abrasion of a guide plate of an SCR (selective catalytic reduction) denitration system, which can quantitatively display and evaluate the erosion abrasion degree of the guide plate and a rectifying grid in the SCR denitration system.
The invention provides a method for visualizing abrasion of a guide plate of an SCR (selective catalytic reduction) denitration system, which comprises the following steps of:
step 2, establishing a particle abrasion model to obtain particle-metal contact erosion quantity of dust particles impacting a guide plate, a flow-guiding gate, a catalyst layer and a blade area;
and 3, visually displaying the running track of the dust particles in the flue gas and the particle-metal contact erosion amount to quantitatively evaluate the wear degree of the guide plate, the rectifying grid, the catalyst layer and the blade area.
Further, the particle tracing model in the step 1 is established based on the dragging force, the accessory mass force, the Basset force, the Saffman force, the particle collision force and the gravity of the dust particles in the movement.
Further, the particle wear model in step 2 is established based on the cutting angle of dust particle impact, the metal erosion amount, and the collision recovery coefficient.
Further, the step 3 further comprises:
and visually displaying the abrasion speed of the guide plate, the flow-adjusting gate, the catalyst layer and the blade area.
By means of the scheme, the erosion abrasion degree of the guide plate and the rectifying grid in the SCR denitration system can be quantitatively displayed and evaluated by the method for visualizing the abrasion of the guide plate of the SCR denitration system.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a method for visualizing wear of a deflector of an SCR denitration system according to the present invention;
FIG. 2 is a schematic arrangement diagram of a guide plate and a rectifying grid of a typical SCR denitration system of a thermal power generating unit;
FIG. 3 is a schematic view of a dust particle motion trajectory;
FIG. 4 is a diagram showing basic variables during a collision phase;
FIG. 5 is a movement trace of dust particles according to an embodiment of the present invention;
fig. 6 shows the movement locus of the dust particles in the area of the deflector 1 according to an embodiment of the present invention;
FIG. 7 is a dust particle motion profile for the flapper door 1 area in one embodiment of the invention;
fig. 8 is a movement trace of dust particles in the area of the deflector 2 in an embodiment of the present invention;
FIG. 9 is a dust particle motion profile for the flapper door 2 area in one embodiment of the invention;
fig. 10 is a movement trace of dust particles in the area of the deflector 3 in an embodiment of the present invention;
FIG. 11 is a graph showing the movement of dust particles in the area of the grille 1 according to an embodiment of the present invention;
fig. 12 shows the movement locus of the dust particles in the area of the deflector 4 according to an embodiment of the present invention;
fig. 13 is a movement trace of dust particles in the area of the deflector 5 in an embodiment of the present invention;
fig. 14 is a movement trace of dust particles in the area of the deflector 6 in an embodiment of the present invention;
fig. 15 shows the movement locus of the dust particles in the area of the deflector 7 according to an embodiment of the present invention;
fig. 16 is a movement trace of dust particles in the area of the deflector 8 in an embodiment of the present invention;
FIG. 17 is a graph showing the movement of dust particles in the area of the grille 2 in accordance with an embodiment of the present invention;
FIG. 18 shows the movement of dust particles in the area of the grille (3) according to an embodiment of the invention;
fig. 19 is a graph showing the movement trajectory of dust particles in the area of the deflector 9 in accordance with an embodiment of the present invention;
fig. 20 shows the movement path of the dust particles in the area of the deflector 10 according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a method for visualizing wear of a deflector of an SCR denitration system, including:
step S1, establishing a particle tracing model to obtain the running track of the dust particles in the flue gas;
step S2, establishing a particle abrasion model to obtain particle-metal contact erosion quantity of dust particles impacting a guide plate, a flow-guiding gate, a catalyst layer and a blade area;
and step S3, visually displaying the running track of the dust particles in the flue gas and the particle-metal contact erosion amount so as to quantitatively evaluate the wear degree of the guide plate, the flow straightener, the catalyst layer and the blade area.
By the method for visualizing the abrasion of the guide plate of the SCR denitration system, quantitative display and evaluation of the erosion abrasion degree of the guide plate and the rectifying grid in the SCR denitration system can be realized.
In this embodiment, the particle tracing model in step S1 is established based on the dragging force, the attachment mass force, the baseset force, the Saffman force, the particle collision force, and the gravity that the dust particles are subjected to during the movement.
In the present embodiment, the particle wear model is established based on the cutting angle at which the dust particles collide, the amount of metal erosion, and the collision recovery coefficient in step S2.
In this embodiment, step S3 further includes:
the abrasion speed of the guide plate, the flow-guiding grid, the catalyst layer and the blade area is visually displayed
The present invention is described in further detail below.
The guide plate abrasion visualization method calculates the motion track of dust particles in the flue gas through a particle tracing model. The working principle of the guide plate abrasion visualization method is described below by taking the abrasion impact of the dust particles in the swirl mixer on the guide vanes as an example. Fig. 3 shows the movement trajectory of the dust particles in the swirl mixer. As can be seen from the figure, the dust forms a self motion track through the channel of the cyclone mixer under the action of the smoke entrainment. And quantitatively evaluating the erosion abrasion effect caused by the dust particles impacting the guide plate, the flow straightener, the catalyst layer and the blade area by adopting a Tabakoff abrasion model. The particle tracking model and the Tabakoff wear model are described in detail below:
particle tracing model
The movement of the particles is caused by the carrying of the mainstream fluid, the analysis of the particle movement necessarily involves the movement of the fluid, and the analysis needs to consider the influence of the fluid on the particle movement. The movement of the particle phase in the flow field is mainly used for analyzing the influence of different acting forces on the particle movement. The acting force of the particle motion mainly comprises gravity, gas resistance, buoyancy, additional mass force, pressure gradient force, Saffman force, Basset force, thermophoretic force, Magnus force, photoelectrophoretic force, electrostatic force and the like. The particle force formula can be expressed as follows according to Newton's second law:
FDis the drag force of the fluid on the particles. The drag force expression for spherical particles is:
wherein, CDIs the drag coefficient.
FAIs the additional mass force. The fluid carries particles to move, the speed of the particles is gradually increased when the particles are accelerated relative to the fluid due to stress, the speed of the fluid around the particles is accelerated due to viscosity, and the particles can dissipate part of kinetic energy. Due to the resistance near the particle, the force originally experienced by the particle is greater than the force required for acceleration, which is called the additional mass force and is expressed as:
FBis the Basset force. The particles are subjected to viscous resistance and additional mass force due to viscosity when moving at variable speeds in the actual fluid. Meanwhile, due to the effect of inertia, when the fluid changes speed, the particles are delayed and subjected to a transient flow resistance, and the force depends on the motion process, and the expression is as follows:
FSis the Saffman force. Because the flow field is uneven, a speed gradient exists, and when the particles move in the flow field, the particles can be subjected to a lifting force which is from a low-speed area to a high-speed area, and the lifting force is a combined effect of shearing and sliding. Within the boundary layer of the object surface, the velocity gradient is considerable, outside the boundary layer the velocity gradient is considerableAlmost zero. The Saffman force must therefore be taken into account within the boundary layer. The expression of Saffman force is:
FMis the Magnus force. When the particle moves in the fluid and the speeds on the two sides are unequal, the particle can rotate due to the viscosity effect of the fluid; the rotation accelerates the fluid on the faster side and slows it down on the slower side. According to the lift theorem, the rotation of the particles in the fluid generates the rotating lift force, and the lift force expression is as follows:
FCis the particle impact force. Particle impact forces are generated by particle-to-particle collisions and particle-to-solid wall collisions, the magnitude of which is related to particle velocity.
FGIs the particle gravity, the expression is:
in the above formula, dpIs the particle diameter, ppIs the particle density.
Two, Tabakoff abrasion model
The Tabakoff wear model is a wear model established on the basis of the results of high-speed wear tests of Virginia coal ash impact particles, ANSI304, 410, aluminum materials and the like serving as target metals. The Tabakoff wear model has higher goodness of fit in prediction and experiment of boiler wear of coal-fired power plants, and is widely applied and adopted.
The main physical quantities before and after the particle collides with the metal surface are shown in FIG. 4, wherein α1Defined as the cutting angle. The Tabakoff wear model wear loss E is defined as the erosion of the metal surface per unit mass of fly ash:
when α0<3α1，C k1 or else Ck0, according to the recommended value α0＝25°；K1＝1.505101×10-6，K2＝0.2960，K3＝5.0×10-12。
The rebound of the collision particles is determined by an empirical equation established by Tabakoff et al on the basis of experiments.
The normal coefficient of restitution expression is:
the tangential coefficient of restitution expression is:
the visualization method provided by the invention can be applied to wear display of a guide plate, a rectifier grid and a catalyst in the SCR flue gas denitration system in figure 2.
Referring to fig. 5 to 20, wear visualization methods are used to visually display the wear of 10 groups of guide plates, 2 groups of baffle doors, and 3 groups of flow-guiding gates in the SCR flue gas denitration system.
Fig. 5 shows the movement locus of the dust particles in the SCR reactor. As can be seen, the dust particles have poor follow-up performance in the flue gas due to high density and inertia, and part of the dust particles are carried by the flue gas and thrown on the inner wall of the reactor, the guide plate and the wall surface of the rectifying grid.
Fig. 6 shows the wear rate display and the dust particle movement path in the region of the deflector 1. It can be seen that the airflow following performance of the dust particles in the area of the guide plate 1 is better, less dust particles impact on the guide plate, and the abrasion condition of the guide plate 1 is not serious.
Fig. 7 shows the movement path of the dust particles in the area of the flapper door 1. It can be seen that the dust particles guided by the guide plate 1 are more collided on the baffle door 1, and the baffle door 1 is obviously eroded and abraded by the dust particles.
Fig. 8 shows the movement path of the dust particles in the region of the deflector 2. It can be seen that the dust particles have a certain erosive wear effect on the area of the deflector 2.
Fig. 9 shows the movement path of the dust particles in the area of the flapper door 2. It can be seen that most of the dust particles pass between the deflector plates 2, and the erosive wear effect of the dust particles on the area of the deflector plates 2 is small.
Fig. 10 shows the movement path of the dust particles in the region of the baffle 3. It can be seen that the deflector 3 is located at the flow bend of the SCR reactor, and dust particles flow through this area and strongly impact the deflector 3, resulting in a more pronounced wear of the deflector 3.
Fig. 11 shows the movement path of the dust particles in the area of the flow straightener 1. It can be seen that most of dust particles flow through the gaps of the rectifier grids by the guide plate 3, and the dust particles and the rectifier grids 1 have no obvious impact phenomenon, so that the erosion and abrasion conditions of the rectifier grids 1 are not obvious.
Fig. 12 shows the movement path of the dust particles in the region of the deflector 4. It can be seen that the dust particles erode and impact the outer area of the deflector 4, and the wear of the deflector 4 is severe.
Fig. 13 shows the movement path of the dust particles in the region of the deflector 5. It can be seen that there is some erosive wear of the 4 th baffle in the baffle group 5.
Fig. 14 shows the movement path of the dust particles in the region of the deflector 6. It can be seen that the deflector 6 is located in the flow curve of the SCR reactor, and dust particles flowing through this region strongly hit the deflector 6, resulting in a more pronounced wear of the deflector 6.
Fig. 15 shows the movement path of the dust particles in the region of the deflector 7. It can be seen that most of the dust particles pass between the deflector plates 7, and the dust particles have less erosive wear on the area of the deflector plates 7.
Fig. 16 shows the movement path of the dust particles in the region of the deflector 8. It can be seen that there is a relatively pronounced wear in the region of the deflector 8.
Fig. 17 shows the movement path of the dust particles in the area of the straightening grate 2. It can be seen that there is no obvious impact phenomenon between the dust particles and the flow straightener 2, and the erosion and wear of the flow straightener 2 is not obvious.
Fig. 18 shows the movement path of the dust particles in the area of the flow straightener 3. It can be seen that there is no significant impact between the dust particles and the flow straightener 3 and erosion and wear of the flow straightener 3 is not significant.
Fig. 19 shows the movement path of the dust particles in the region of the deflector 9. It can be seen that the dust particles undergo significant turning motion in the upstream area of the guide plate 9, most of the dust particles have poor follow-up performance to the flue gas and are thrown to the outer area of the guide plate 9 by the air flow, and the dust particles impact on the guide plate 9, so the erosion and abrasion effects of the guide plate 9 are serious.
Fig. 20 shows the movement locus of the dust particles in the area of the deflector 10. It can be seen that there is a relatively significant wear on the partial area of the baffle 10.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A method for visualizing abrasion of a guide plate of an SCR denitration system is characterized by comprising the following steps:
step 1, establishing a particle tracing model to obtain a running track of dust particles in flue gas;
step 2, establishing a particle abrasion model to obtain particle-metal contact erosion quantity of dust particles impacting a guide plate, a flow-guiding gate, a catalyst layer and a blade area;
and 3, visually displaying the running track of the dust particles in the flue gas and the particle-metal contact erosion amount to quantitatively evaluate the wear degree of the guide plate, the rectifying grid, the catalyst layer and the blade area.
2. The method for visualizing abrasion of flow deflectors of SCR denitration system as recited in claim 1, wherein said particle tracking model in step 1 is established based on a dragging force, an attachment mass force, a Basset force, a Saffman force, a particle collision force, and a gravity to which dust particles are subjected in motion.
3. The method for visualizing wear of a deflector of an SCR denitration system according to claim 2, wherein the particle wear model in step 2 is established based on a cutting angle of dust particle impact, a metal erosion amount, and a collision recovery coefficient.
4. The method for visualizing wear of a deflector of an SCR denitration system according to claim 1, wherein the step 3 further comprises:
and visually displaying the abrasion speed of the guide plate, the flow-adjusting gate, the catalyst layer and the blade area.
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