CN212467728U - Flue gas turbulence device - Google Patents

Abstract

The utility model discloses a flue gas vortex device, flue gas vortex device includes flue section (5) and vortex mechanism (6), vortex mechanism (6) contain pivot (13) and drive assembly (7) that connect gradually, pivot (13) are equipped with a plurality of first vortex baffles (10) outward, the axis direction interval arrangement of pivot (13) is followed in a plurality of first vortex baffles (10), first vortex baffle (10) are located flue section (5), drive assembly (7) can drive pivot (13) and a plurality of first vortex baffle (10) and use the axis of pivot (13) to rotate as the axle. The flue gas turbulence device can fully destroy the laminar flow state of flue gas, so that the flue gas is fully mixed after ammonia spraying, the overall temperature of the flue gas is finally consistent, the deviation of a temperature flow field is thoroughly eliminated, and the problem of non-uniform temperature flow field of an SCR inlet elbow flue is solved.

Description

Flue gas turbulence device

Technical Field

The utility model relates to a flue gas vortex device.

Background

The denitration device is not designed before 2018, so that most of flue gas is treated by reforming after desulfurization, and the denitration device is additionally arranged to meet the requirement of ultralow emission. The commonly adopted process mode is a medium-low temperature SCR denitration technology, and the core equipment is a vanadium-titanium based catalyst. The applicable temperature range of the general active components of the catalyst is 260-420 ℃, when the temperature is lower than 260 ℃, ammonia at the denitration inlet reacts with sulfur in the flue gas to generate ammonium bisulfate or ammonium bisulfate, and in a certain temperature region range, the ammonium bisulfate can be attached to or permeate into micropores of the denitration catalyst to prevent NH3 and NO in the flue gas from diffusing to the surfaces of active particles of the catalyst to carry out reduction reaction, so that the activity of the catalyst is disabled, and the catalyst is poisoned.

The SCR system is arranged behind the dedusting and desulfurizing device, and the flue gas enters the SCR denitration system after wet electrostatic dedusting. In the SCR system, the flue gas temperature is raised to about 260-300 ℃ through a heating device, the flue gas enters a catalyst layer of an SCR reactor for denitration, the discharged flue gas exchanges heat with low-temperature flue gas in an SCR inlet flue to reduce the temperature, and the flue gas is discharged through a chimney. At the moment, the flue gas has low sulfur and low dust, and the poisoning effect on the catalyst is greatly reduced. At present, 70% of the market adopts a denitration process after desulfurization. However, the requirement on the catalytic activity of the catalyst is higher at medium and low temperatures, while the conventional vanadium-titanium catalyst has poor effect on the low-temperature activity, and how to improve the activity of the catalyst at low temperature is a big problem required by catalyst manufacturers at present. In addition, below 300 ℃ of flue gas, ammonia bisulfate can generate a condensation site to block catalyst micropores or form a stacking adhesion blocking phenomenon, and the ammonia bisulfate needs to be heated and pyrolyzed periodically to activate the catalyst, so that the operation and maintenance cost can be greatly increased.

The temperature of the sintering flue gas after desulfurization is usually only 50-60 ℃, in order to ensure the normal temperature operation of the SCR denitration device, the temperature of the flue gas at the SCR inlet is ensured to be higher than 260 ℃ by supplementing heat to the sintering flue gas through the heating furnace, and the flue gas after heat supplementation of the heating furnace needs to uniformly pass through the catalyst module, so that the heat supplementation amount of the heating furnace can be reduced, and the service life of the catalyst can be prolonged.

The flue gas denitration technology mainly aims to reduce NOx and dust in sintering flue gas to be below the latest national environmental protection requirements, reduce the pollution of emission to the environment, and play an important role in improving the environmental pollution of enterprises and ensuring production after the technology is implemented. Besides the catalyst, the main stream steel flue gas SCR denitration system also has a key factor of flue gas flow field uniformity.

SUMMERY OF THE UTILITY MODEL

In order to make flue gas flow field even among the flue gas SCR deNOx systems, the utility model provides a flue gas vortex device, this flue gas vortex device can fully destroy the laminar flow state of flue gas, makes the flue gas obtain intensive mixing after spouting the ammonia, finally makes the whole temperature of flue gas tend to unanimous, thoroughly eliminates the deviation in temperature flow field, solves the uneven problem in SCR entry elbow flue temperature flow field.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a flue gas vortex device, includes flue section and vortex mechanism, and vortex mechanism contains the pivot and the drive assembly that connect gradually, is equipped with a plurality of first vortex baffles outside the pivot, and a plurality of first vortex baffles are along the axis direction interval arrangement of pivot, and first vortex baffle is located the flue section, and drive assembly can drive the pivot and a plurality of first vortex baffles use the axis of pivot as the axle rotation.

The first turbulence baffle is of an oval structure, the long axis of the first turbulence baffle is parallel to the axis of the rotating shaft, and the plurality of first turbulence baffles are all located in the first plane.

The pivot external fixation cover is equipped with the rectangular pipe, and the internal surface and the rectangular pipe of first vortex baffle are connected fixedly, and first vortex baffle sets up with the lateral wall range upon range of rectangular pipe.

The internal surface of first vortex baffle is equipped with the reinforcing plate, and the reinforcing plate is perpendicular with first vortex baffle, and the position of reinforcing plate corresponds with the minor axis of first vortex baffle.

The surface of first vortex baffle is equipped with a plurality of slots, and the slot sets up along the diameter direction of first vortex baffle, and a plurality of slots are along the even interval arrangement of circumference of first vortex baffle.

The depth of the groove is gradually increased and the width of the groove is also gradually increased along the direction from the center of the first turbulent baffle to the edge of the first turbulent baffle.

The rotating shaft is also provided with a plurality of second turbulence baffles which are arranged at intervals along the axis direction of the rotating shaft, the second turbulence baffles have the same structure as the first turbulence baffles, and the inner surfaces of the second turbulence baffles are fixedly connected with the rectangular tubes.

A plurality of second vortex baffles all are located the second plane, the second plane with the first plane is parallel, and the rectangular pipe is located the second plane with between the first plane, first vortex baffle and second vortex baffle arrange along the axis direction of pivot in turn, have overlap region between adjacent first vortex baffle and the second vortex baffle.

The flue section is 90 degrees elbows, and the entry of flue section is down, and the export of flue section is towards the horizontal direction, flue gas vortex device includes a plurality of vortex mechanisms, and is parallel to each other between a plurality of vortex mechanisms's the pivot, and the axis of pivot is perpendicular with the plane at the central line place of flue section.

The utility model has the advantages that: the flue gas denitration device can be additionally arranged on the basis that the existing structure is not changed in the existing flue gas denitration flue, and the additionally arranged flue gas turbulence device is simple and convenient to process and manufacture, low in cost, convenient to install and convenient to overhaul and adjust. After adopting this flue gas vortex device, can reduce because of the vibration that the flue gas torrent takes place and spout the flue gas SCR entry temperature inhomogeneous that the ammonia mixes and cause, can obviously reduce manufacturing cost, improve catalyst operation life simultaneously, improve denitration reactor overall safety nature.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic view of a flue gas turbulator according to the present invention in embodiment 1.

Fig. 2 is a schematic view of the direction a in fig. 1.

Fig. 3 is an enlarged schematic view of a portion of the first spoiler shown in fig. 1.

Fig. 4 is a front view of the first spoiler in embodiment 1.

Fig. 5 is a rear view of the first spoiler in embodiment 1.

Fig. 6 is a left side view of the first spoiler in embodiment 1.

Fig. 7 is a schematic view of a flue gas SCR denitration system according to the present invention in embodiment 1.

Fig. 8 is a schematic view of the flue gas turbulator of the present invention in embodiment 2.

Fig. 9 is a schematic view in the direction B in fig. 8.

Fig. 10 is an enlarged schematic view of a portion of the first spoiler portion of fig. 8.

Fig. 11 is a schematic view of a first spoiler and a second spoiler in hybrid use.

1. A lower elbow of the flue gas inlet; 2. a hot flue gas mixing device; 3. an ammonia injection device; 4. an ammonia gas static mixer; 5. a flue section; 6. a flow disturbing mechanism; 7. a drive assembly; 8. a sensor; 9. an inlet flue of the SCR denitration reactor; 10. a first baffle; 11. a reinforcing plate; 12. a rectangular tube; 13. a rotating shaft; 14. a second baffle; 15. a trench; 16. a main flue; 17. SCR denitration reactor.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

The utility model provides a flue gas vortex device, includes flue section 5 and vortex mechanism 6, vortex mechanism 6 contains pivot 13 and the drive assembly 7 that connects gradually, pivot 13 is equipped with a plurality of first vortex baffles 10 outward, a plurality of first vortex baffles 10 are along the axis direction interval arrangement of pivot 13, first vortex baffle 10 is located flue section 5, drive assembly 7 can drive pivot 13 and a plurality of first vortex baffles 10 and use the axis of pivot 13 to rotate the angle of settlement as the axle, as shown in figure 1 to figure 3.

In the SCR denitration reaction, the main factors influencing the denitration efficiency are flue gas temperature, catalyst parameters including activity temperature, pitch, porosity and the like, reactor flow field distribution and the like. On the premise that various performance parameters of the catalyst and the arrangement mode of the reactor are determined, the further improvement of denitration efficiency and the reduction of NH3 escape rate are greatly determined by whether the uniformity of a flue gas flow field in the reactor, particularly after an inlet, is good.

The utility model discloses in, utilize the effect that turns to of first vortex baffle 10, according to pressure and temperature control, realize the biggest level with the air current of vertical direction and turn to reach the air current impact at the flue top of disturbing flue gas stream to lateral wall and vertical airflow inlet pipeline extension direction, and then realize the evenly distributed of the flue gas of elbow flue and SCR entry flue, eliminate flue gas torrent and drift.

In this embodiment, the first spoiler 10 is a circular structure or an elliptical structure, preferably, the first spoiler 10 is an elliptical structure, the major axis of the first spoiler 10 is parallel to the axis of the rotating shaft 13, the major axes of the first spoiler 10 are all located in the same horizontal straight line, the first spoiler 10 is located in a first plane, and the first plane is parallel to the axis of the rotating shaft 13.

The first baffle 10 may be made of stainless steel, cast iron, cast steel, or may be welded with steel or alloy, or cast iron. The first baffle 10 has various geometric dimensions, such as an equal diameter or unequal diameter, a structure with a fixed thickness in the thickness direction of the first baffle 10, or an unequal thickness structure, and a combination mode of equal diameter with the same thickness, equal diameter with different thicknesses, unequal diameter with the same thickness, and unequal diameter with different thicknesses can be performed.

In this embodiment, the outer fixed cover of pivot 13 is equipped with rectangular pipe 12, and rectangular pipe 12 is located between pivot 13 and the first vortex baffle 10, and pivot 13 and rectangular pipe 12 welded fastening, the internal surface of first vortex baffle 10 towards pivot 13, the internal surface and the rectangular pipe 12 welded fastening of first vortex baffle 10, the range upon range of setting of the lateral wall of first vortex baffle 10 and rectangular pipe 12, it can make first vortex baffle 10 more firm in pivot 13 to set up rectangular pipe 12.

In this embodiment, the inner surface of the first spoiler 10 is provided with a reinforcing plate 11, the reinforcing plate 11 is perpendicular to the first spoiler 10, and the position of the reinforcing plate 11 corresponds to the short axis of the first spoiler 10. The reinforcing plate 11 is of a right-angled triangle structure, one right-angled side of the reinforcing plate 11 is welded and fixed with the first turbulent baffle 10, and the other right-angled side of the reinforcing plate 11 is welded and fixed with the rectangular pipe 12, as shown in fig. 5 and 6.

In this embodiment, the outer surface of the first spoiler 10 is provided with a plurality of grooves 15, the grooves 15 are arranged along the diameter direction of the first spoiler 10, and the grooves 15 are uniformly arranged along the circumferential direction of the first spoiler 10 at intervals. In the direction from the center of the first spoiler 10 to the edge of the first spoiler 10, the depth of the groove 15 is gradually increased, and the width of the groove 15 is also gradually increased, i.e., the groove 15 is substantially fan-shaped.

Specifically, the surface of first vortex baffle 10 is equipped with four slot 15, four slot 15 are along the even interval arrangement of circumference of first vortex baffle 10, the contained angle between two adjacent slot 15 is 90, slot 15 is located the centre of the major axis of first vortex baffle 10 and the minor axis of first vortex baffle 10, the one end of slot 15 is located the center of first vortex baffle 10, the other end of slot 15 is located the edge of first vortex baffle 10, the degree of depth of the one end of slot 15 is 0mm, as shown in fig. 4. The smoke flows along the grooves 15 to form rotary cutting disturbance, and the disturbance resistance is small and the disturbance effect is stronger.

In this embodiment, the flue segment 5 is a 90-degree elbow, the inlet of the flue segment 5 faces downward, the outlet of the flue segment 5 faces in the horizontal direction (for example, faces to the left or right), a sensor 8 is arranged in the side wall of the flue segment 5, the sensor 8 is a temperature and pressure sensor, a channel steel reinforcing rib is arranged outside the flue segment 5, and the size of the channel steel reinforcing rib is based on the back of the channel steel. The flue gas turbulence device comprises a plurality of (at least two) turbulence mechanisms 6, the rotating shafts 13 of the turbulence mechanisms 6 are parallel to each other, and the axis of each rotating shaft 13 is vertical to the plane where the central line of the flue section 5 is located. The driving assembly 7 comprises an electric actuating unit, and the driving assembly 7 is positioned outside the flue section 5.

The first spoiler 10 may be manufactured by 310S, welded by steel plates, or machined by refractory materials, and the distance between two adjacent first spoiler 10 may be determined as required. The included angle between the central line of the flue gas flow vertical pipeline and the horizontal central line of the first turbulence baffle 10 can be adjusted in the circumferential direction, so that the flexible selection of different included angles under automatic control is realized, and the actual requirement of flue gas flow steering with different structures is met.

The flue gas turbulence device is determined according to the bending radius of the flue section 5, comprises at least two groups of turbulence mechanisms 6, and is automatically controlled through temperature and pressure sensors arranged on the side wall of the flue section 5. First vortex baffle 10 can slow down the circulation rate of flue gas in the flue, makes more heat energy of flue gas be conducted to SCR entry inclined plane flue through first vortex baffle 10 to improve the mixing efficiency of flue gas after the concurrent heating after spouting ammonia, strengthen the air current disturbance, force the flue gas in the circulation distance of short distance, form good even temperature field and air current circulation.

The flue gas SCR denitration system comprises a main flue 16, a flue gas turbulence device and an SCR denitration reactor 17 which are sequentially connected, wherein the flue gas turbulence device is the flue gas turbulence device. The main flue 16 is vertical state, and the lower extreme of main flue 16 is connected with elbow 1 under the flue gas entry, contains hot flue gas mixing arrangement 2, ammonia injection device 3 and ammonia static mixer 4 that from the bottom upwards set gradually in the main flue 16, and the entry end of this flue gas vortex device's flue section 5 is connected with the upper end of main flue 16, and the exit end of this flue gas vortex device's flue section 5 corresponds with SCR denitration reactor entry flue 9 of SCR denitration reactor 17 and is connected, as shown in figure 7.

The flue gas usually needs to be turned over for multiple times to enter the SCR denitration reactor 17 for denitration reaction, and necessary measures need to be taken to increase the flow at the flue gas end to ensure the sufficient mixing of ammonia and flue gas, so the inlet flue gas distribution of the catalyst is certainly affected by the upstream flow field, and the phenomenon of uneven pressure, speed, concentration and temperature distribution in the catalyst reactor is caused. If the flue gas velocity is too high, the phenomena of short reaction time of the catalyst, low catalytic efficiency, high ammonia escape rate and the like can be caused, and more importantly, the scouring and abrasion of the catalyst are serious, so that the service life and the economical efficiency of the catalyst can be reduced. And the flue gas velocity is too low, so that the catalyst is deposited and blocked, the utilization rate of the catalyst is reduced sharply, and the efficiency and the economical efficiency of the catalyst are also reduced. Therefore, the flue gas in the flue, especially the flue gas velocity distribution in front of the catalyst inlet after the ammonia spraying system is ensured, and the ammonia spraying and the catalyst can be ensured to react under the optimal environment.

According to the analysis of the aerodynamic principle, the air resistance of the smoke in the pipeline can be divided into longitudinal, lateral and vertical 3 directions of acting force, and the resistance is in direct proportion to the air flow speed. In order to effectively reduce and overcome air resistance generated when the flue gas and the ammonia gas are mixed, the flow control is carried out by adopting the spoiler, the mixing efficiency is improved, and the ammonia spraying amount can be saved. The spoiler is used as a flow field auxiliary system, particularly at the elbow, the air flow speed is different, and the centrifugal motion generated by uneven smoke dust or ammonia in smoke can be effectively avoided by additionally arranging the spoiler device.

The design of the spoiler type needs to consider two aspects of dynamic function and simple and easy installation and maintenance. The installation is in 12 both sides of rectangular pipe, and oval vortex baffle is simple and easy in the aspect of making, and is more firm during the installation, and baffle radius and interval can be according to the flow field adjustment, can adjust the blade device according to actual elbow flue structure automatic control during the installation, satisfy the actual demand that different structure flue gas flows turned to. Air resistance and a mixing state are monitored through a temperature sensor and a pressure sensor, and the direction and the angle between the blades and the flue gas are adjusted, so that the flue gas flow impact on the side wall and the top of the flue in the extending direction of the vertical air flow inlet pipeline is disturbed, and turbulent flow vibration is avoided. This flue gas vortex device can realize turning to of angle to a certain extent, and investment cost is low, arranges that the position is enough to guarantee flue gas flow direction and the mixing state of entry elbow department, reduces and produces the impact effect, can realize effectual rectification.

Example 2

The present embodiment is an improvement of embodiment 1, and the main difference between the present embodiment and embodiment 1 is that a plurality of second spoiler baffles 14 are further disposed outside a rotating shaft 13 of the spoiler mechanism 6, the plurality of second spoiler baffles 14 are arranged at intervals along an axis direction of the rotating shaft 13, the second spoiler baffles 14 have the same structure as the first spoiler baffle 10, the second spoiler baffles 14 and the first spoiler baffles 10 are mirror images, a long axis of the second spoiler baffles 14 is parallel to the axis of the rotating shaft 13, and an inner surface of the second spoiler baffles 14 is welded and fixed to the rectangular pipe 12, as shown in fig. 8 to 10.

In this embodiment, a plurality of second spoiler 14 all are located the second plane, and the major axis of a plurality of second spoiler 14 all is located same horizontal straight line, the second plane with the first plane is parallel, and rectangular pipe 12 is located the second plane with between the first plane, namely rectangular pipe 12 is located between second spoiler 14 and first spoiler 10, and first spoiler 10 and second spoiler 14 arrange along the axis direction of pivot 13 in turn, and first spoiler 10 and second spoiler 14 have overlap area, and along the axis direction of pivot 13, this length of overlap area is less than the half of the major axis of first spoiler 10.

The flue gas turbulence device comprises a plurality of (at least two) turbulence mechanisms 6, the rotating shafts 13 of the turbulence mechanisms 6 are parallel to each other, and the axis of each rotating shaft 13 is vertical to the plane where the central line of the flue section 5 is located. The rotating shaft 13 of the spoiler mechanism 6 may be provided with only the first spoiler 10 or the second spoiler 14, and the rotating shaft 13 of the spoiler mechanism 6 may be provided with the first spoiler 10 and the second spoiler 14 at the same time, as shown in fig. 11, and the specific setting manner may be determined by those skilled in the art as required.

Other technical features of this embodiment can be the same as those of embodiment 1, and this embodiment will not be described in detail for the sake of brevity.

For convenience of understanding and description, the present invention is described by combining absolute positional relationships, wherein the term "up" indicates the upper direction in fig. 7, "down" indicates the lower direction in fig. 7, "left" indicates the left direction in fig. 7, and "right" indicates the right direction in fig. 7. The present invention is described by using the observation angle of the reader, but the above-mentioned orientation words can not be understood or interpreted as the limitation of the protection scope of the present invention.

The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and technical scheme, technical scheme and the technical scheme all can the independent assortment use.

Claims (9)

1. The utility model provides a flue gas vortex device, a serial communication port, flue gas vortex device includes flue section (5) and vortex mechanism (6), vortex mechanism (6) contain pivot (13) and drive assembly (7) that connect gradually, pivot (13) are equipped with a plurality of first vortex baffles (10) outward, the axis direction interval arrangement of pivot (13) is followed in a plurality of first vortex baffles (10), first vortex baffle (10) are located flue section (5), drive assembly (7) can drive pivot (13) and a plurality of first vortex baffle (10) and use the axis of pivot (13) to rotate as the axle.

2. The flue gas turbulator device of claim 1, wherein the first turbulator baffle (10) is an oval structure, a long axis of the first turbulator baffle (10) is parallel to an axis of the rotating shaft (13), and the plurality of first turbulator baffles (10) are all located in a first plane.

3. The flue gas turbulence device according to claim 2, wherein a rectangular tube (12) is fixedly sleeved outside the rotating shaft (13), the inner surface of the first turbulence baffle (10) is fixedly connected with the rectangular tube (12), and the first turbulence baffle (10) and the side wall of the rectangular tube (12) are stacked.

4. The flue gas turbulator device of claim 3, wherein the inner surface of the first turbulator plate (10) is provided with a reinforcing plate (11), the reinforcing plate (11) is perpendicular to the first turbulator plate (10), and the position of the reinforcing plate (11) corresponds to the short axis of the first turbulator plate (10).

5. The flue gas turbulator device of claim 1, wherein the outer surface of the first turbulator baffle (10) is provided with a plurality of grooves (15), the grooves (15) are arranged along the diameter direction of the first turbulator baffle (10), and the grooves (15) are uniformly arranged along the circumferential direction of the first turbulator baffle (10) at intervals.

6. The flue gas turbulator device of claim 5, wherein the depth of the groove (15) is gradually increased and the width of the groove (15) is also gradually increased along the direction from the center of the first turbulator (10) to the edge of the first turbulator (10).

7. The flue gas turbulence device according to claim 3, wherein a plurality of second turbulence baffles (14) are further arranged outside the rotating shaft (13), the second turbulence baffles (14) are arranged at intervals along the axial direction of the rotating shaft (13), the second turbulence baffles (14) have the same structure as the first turbulence baffle (10), and the inner surfaces of the second turbulence baffles (14) are fixedly connected with the rectangular pipe (12).

8. The flue gas turbulator device of claim 7, wherein the plurality of second turbulators (14) are all located in a second plane, the second plane is parallel to the first plane, the rectangular tubes (12) are located between the second plane and the first plane, the first turbulators (10) and the second turbulators (14) are alternately arranged along an axial direction of the rotating shaft (13), and an overlapping region exists between the adjacent first turbulators (10) and the second turbulators (14).

9. The flue gas turbulence device according to claim 1, characterized in that the flue segment (5) is a 90-degree elbow, the inlet of the flue segment (5) faces downward, the outlet of the flue segment (5) faces the horizontal direction, the flue gas turbulence device comprises a plurality of turbulence mechanisms (6), the rotating shafts (13) of the plurality of turbulence mechanisms (6) are parallel to each other, and the axis of the rotating shaft (13) is perpendicular to the plane where the center line of the flue segment (5) is located.

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