CN211987908U - SCR denitration diversion system with adjustable inclination - Google Patents
SCR denitration diversion system with adjustable inclination Download PDFInfo
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- CN211987908U CN211987908U CN202020442653.6U CN202020442653U CN211987908U CN 211987908 U CN211987908 U CN 211987908U CN 202020442653 U CN202020442653 U CN 202020442653U CN 211987908 U CN211987908 U CN 211987908U
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Abstract
The utility model relates to a SCR denitration diversion system with adjustable inclination, including the flue main part, its characterized in that is equipped with import water conservancy diversion section in proper order in the flue main part, spouts ammonia section, catalysis section and export section, and ann has adjustable water conservancy diversion structure in import water conservancy diversion section, and the catalyst layer is located the top of export section. The utility model has the advantages of reasonable design, the adjustment is nimble, through setting up adjustable water conservancy diversion structure in the flue main part, and the speed monitoring point, through speed distribution in the speed monitoring point monitoring flue, and then the homogeneity of the distribution of flue gas in the monitoring flue, when entry flue gas volume changes, through rotating the flat board, the cooperation is carried out the pole, adjust entry flue gas volume and distribute, the flow field adjustment with a plurality of regions in ammonia injection grid low reaches is even, fully improve the homogeneity that ammonia injection grid entry flue gas distributes, improve the mixed effect of flue gas and ammonia, be convenient for adapt to under the different loads, the distribution of SCR reactor entry flow field under the different flue gas volumes.
Description
Technical Field
The utility model relates to a coal fired power generation pollutant desorption technical field especially relates to a SCR denitration diversion system with adjustable inclination.
Background
With the increasingly strict environmental protection requirements and the increasingly strict pollutant emission standards of coal-fired power plants, nitrogen oxides (NOx) emitted by coal-fired power plants are taken as important indexes of the environmental protection requirements, and the coal-fired power plants are subjected to large-scale ultralow emission modification in order to reach the ultralow emission standard.
The low-nitrogen modification is important content of ultralow emission modification, the low-nitrogen modification mainly comprises low-nitrogen combustion modification and flue gas denitration modification, wherein a Selective Catalytic Reduction (SCR) flue gas denitration technology is widely adopted due to high denitration efficiency and is limited by a modification space, the SCR reactor has a plurality of elbows and variable cross sections, and due to the elbows and the variable cross sections, a flue gas flow field in the SCR reactor is unevenly distributed, so that a fixed guide plate is additionally arranged at the elbow of a flue in the design process of the SCR reactor, and the distribution of flue gas under the flow guiding effect of the guide plate when the flue gas flows through the elbows is improved.
Usually, the SCR reactor design stage will carry out numerical simulation according to flue gas volume when full load, and the entry usually assumes uniform velocity entry, and at this moment, the flow field homogeneity index that the simulation result shows all satisfies the design requirement.
But current SCR denitration diversion system is at the actual operation in-process, the flue gas volume changes along with the load, the flue gas volume is different under the different loads, there is great deviation in flue gas fullness, when unit load changes at present stage, entry flue gas volume changes, it is difficult to guarantee evenly to make the flue gas distribute at SCR reactor entry, it is difficult to guarantee evenly promptly to spout the flue gas velocity distribution of ammonia grid low reaches, thereby it is unsatisfactory to lead to flue gas and ammonia mixing effect, and then cause denitration reactor export ammonia escape rate too high, lead to whole denitration efficiency low on the contrary, influence the security and the economic nature of unit operation.
Disclosure of Invention
The utility model discloses aim at solving prior art not enough, and provide an SCR denitration diversion system with adjustable inclination.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
an inclination-angle-adjustable SCR denitration flow guide system comprises a flue main body, and is characterized in that an inlet flow guide section, an ammonia spraying section, a catalysis section and an outlet section are sequentially arranged on the flue main body, an ash hopper is arranged at the joint of the inlet flow guide section and the ammonia spraying section, an adjustable flow guide structure is arranged in the inlet flow guide section, a plurality of ammonia spraying grids are uniformly arranged on the cross section in the ammonia spraying section, the liquid inlet ends of the ammonia spraying grids are connected with an ammonia spraying main pipe outside the flue main body through connecting pipes, flue elbows are arranged on the flue main body above the ammonia spraying section and the flue main body above the catalysis section, a plurality of guide plates are arranged in the flue elbows above the catalysis section at equal intervals, a catalyst layer is arranged in the flue main body of the catalysis section, the catalyst layer is arranged above the outlet section, a plurality of concentric inverse arc fixing plates are arranged in the flue elbows above the ammonia spraying section, and regular arc fixing plates corresponding to the inverse arc fixing plates one by one are arranged at the bottom of the ammonia spraying section, the regular arc fixing plate is installed in the flue body, a plurality of speed monitoring points are installed on the cross section in the flue body between the outlet of the regular arc fixing plate and the ammonia injection grid, detection signals from the speed monitoring points are connected into the anemoscope, and the anemoscope is connected with external control signals.
The adjustable flow guide structure comprises a plurality of rotating flat plates which are uniformly arranged along the height direction of the flue, the rotating flat plates divide a flue inlet flow guide section into a plurality of areas, the rotating flat plates and the regular arc fixing plates are arranged in a one-to-one correspondence manner, one end of each rotating flat plate, which is closer to the flue inlet, is a free end, the other end of each rotating flat plate is a rotating end, a connecting shaft is arranged on the rotating end of each rotating flat plate, the rotating flat plates are rotatably connected with the corresponding regular arc fixing plates through the connecting shafts, corresponding executing rods are hinged below each rotating flat plate, an arc-shaped rack which coaxially rotates with the connecting shafts is hinged on each executing rod, an arc-shaped chute which coaxially rotates with the connecting shafts is arranged on the side wall of each arc-shaped rack, a limiting column which is matched with the arc-shaped chute is arranged on the inner wall of the flue main body, a gear is, an actuating motor is coaxially and fixedly connected to the gear, the actuating motor is installed on the outer side of the flue main body, and the actuating motor is connected with an external control signal.
The speed monitoring points are arranged on the same horizontal section in the flue main body at equal intervals.
The utility model has the advantages that: the utility model has the advantages of reasonable design, the adjustment is nimble, through setting up adjustable water conservancy diversion structure in the flue main part, and the speed monitoring point, through speed distribution in the speed monitoring point monitoring flue, and then the homogeneity of the distribution of flue gas in the monitoring flue, when entry flue gas volume changes, through rotating the flat board, the cooperation is carried out the pole, adjust entry flue gas volume and distribute, the flow field adjustment with a plurality of regions in ammonia injection grid low reaches is even, fully improve the homogeneity that ammonia injection grid entry flue gas distributes, improve the mixed effect of flue gas and ammonia, be convenient for adapt to under the different loads, the distribution of SCR reactor entry flow field under the different flue gas volumes.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
in the figure: 1-a flue body; 2-ammonia injection grid; 3-spraying ammonia mother pipe; 4-a connecting shaft; 5-an actuating lever; 6-rotating the flat plate; 7-a right circular arc fixing plate; 8-speed monitoring points; 9-reverse arc fixing plate; 10-a baffle; 11-a catalyst layer; 12-ash bucket; 13-arc rack; 14-a gear;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention will be further explained with reference to the following figures and examples:
as shown in figure 1-2, an inclination-angle-adjustable SCR denitration diversion system comprises a flue main body 1, and is characterized in that an inlet diversion section, an ammonia spraying section, a catalysis section and an outlet section are sequentially arranged on the flue main body 1, an ash hopper 12 is arranged at the joint of the inlet diversion section and the ammonia spraying section, an adjustable diversion structure is arranged in the inlet diversion section, a plurality of ammonia spraying grids 2 are uniformly distributed on the cross section in the ammonia spraying section, the liquid inlet ends of the ammonia spraying grids 2 are connected with an ammonia spraying main pipe 3 on the outer side of the flue main body 1 through connecting pipes, flue elbows are arranged on the flue main body 1 above the ammonia spraying section and the flue main body 1 above the catalysis section, a plurality of guide plates 10 are arranged in the flue elbows above the catalysis section at equal intervals, a catalyst layer 11 is arranged in the flue main body 1 of the catalysis section, the catalyst layer 11 is arranged above the outlet section, a plurality of concentric reverse arc fixing plates 9 are arranged in the flue elbows above the ammonia spraying section, the bottom of the ammonia spraying section is provided with a regular arc fixing plate 7 which is in one-to-one correspondence with the reverse arc fixing plate 9, the regular arc fixing plate 7 is installed in the flue main body 1, a plurality of speed monitoring points 8 are installed on the cross section in the flue main body 1 between the outlet of the regular arc fixing plate 7 and the ammonia spraying grid 2, detection signals from the speed monitoring points 8 are connected into an anemoscope, and the anemoscope is connected with an external control signal.
The adjustable flow guide structure comprises a plurality of rotating flat plates 6 which are uniformly arranged along the height direction of the flue, the rotating flat plates 6 divide a flue inlet flow guide section into a plurality of areas, the rotating flat plates 6 are arranged in one-to-one correspondence with the regular circular arc fixing plates 7, one end of each rotating flat plate 6, which is close to the flue inlet, is a free end, the other end of each rotating flat plate 6 is a rotating end, a connecting shaft 4 is arranged on the rotating end of each rotating flat plate 6, the rotating flat plates 6 are rotatably connected with the corresponding regular circular arc fixing plates 7 through the connecting shafts 4, corresponding executing rods 5 are hinged below each rotating flat plate 6, an arc-shaped rack 13 which coaxially rotates with the connecting shafts 4 is hinged on each executing rod 5, an arc-shaped sliding chute which coaxially rotates with the connecting shafts 4 is arranged on the side wall of each arc-shaped rack 13, a limiting column which is matched with the arc-shaped sliding chute is arranged on, the gear 14 is positioned below the corresponding rotating flat plate 6, the gear 14 is coaxially and fixedly connected with an actuating motor, the actuating motor is arranged on the outer side of the flue main body 1, and the actuating motor is connected with an external control signal.
The speed monitoring points 8 are arranged at equal intervals on the same horizontal section in the flue main body 1.
In the operation process of the utility model, the flue gas enters the flue main body 1 from the inlet of the SCR reactor, the flue gas is firstly divided into various regions by the rotating plate 6, then sequentially passes through the positive arc fixed plate 7 and the speed monitoring point 8, the anemograph transmits the measured data signal to the external control signal when passing through the speed monitoring point 8, the external control signal calculates the flue gas distribution deviation automatically, then the deviation signal is transmitted to the executing motor, the executing motor drives the gear 14 to rotate according to the deviation, the gear 14 drives the executing rod 5 to move up and down by a certain displacement through the arc rack 13, further drives the rotating plate 6 to rotate by a certain angle by taking the connecting shaft 4 as the shaft, thereby adjusting the uniformity of the downstream flue gas distribution of the ammonia injection grid 2, until each speed deviation monitored by the speed monitoring point 8 is within an allowable range, the adjustment of the rotating plate 6 is stopped, the flue gas with uniform distribution flows through the ammonia injection grid, fully mixed with the ammonia gas sprayed by the ammonia spraying grid 2, then flows into the catalyst layer 11 through the reverse arc fixed plate 9 and the guide plate 10 in sequence to carry out catalytic reduction reaction, realizes the removal of nitrogen oxides in the flue gas, and finally is discharged through the outlet section of the flue main body 1, the utility model monitors the speed distribution in the flue through the speed monitoring point 8, and further monitors the uniformity of the distribution of the flue gas in the flue, when the entry flue gas volumn changes, through rotating dull and stereotyped 6, the cooperation is carried out pole 5, adjusts entry flue gas volumn and is distributed, and the flow field adjustment that will spout a plurality of regions in 2 low reaches of ammonia grid is even, fully improves the homogeneity that spouts 2 entry flue gas of ammonia grid and distributes, improves the mixed effect of flue gas and ammonia, be convenient for adapt to under the different loads, under the different flue gas volumns distribution of SCR reactor entry flow field, the utility model has the advantages of reasonable design, the adjustment is nimble.
The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and various improvements made by the method concept and technical solution of the present invention or directly applied to other occasions without improvement are all within the protection scope of the present invention.
Claims (3)
1. An inclination-angle-adjustable SCR denitration diversion system comprises a flue main body (1), and is characterized in that an inlet diversion section, an ammonia spraying section, a catalysis section and an outlet section are sequentially arranged on the flue main body (1), an ash hopper (12) is arranged at the joint of the inlet diversion section and the ammonia spraying section, an adjustable diversion structure is arranged in the inlet diversion section, a plurality of ammonia spraying grids (2) are uniformly distributed on the cross section in the ammonia spraying section, the liquid inlet ends of the ammonia spraying grids (2) are connected with an ammonia spraying main pipe (3) on the outer side of the flue main body (1) through connecting pipes, flue elbows are arranged on the flue main body (1) above the ammonia spraying section and on the flue main body (1) above the catalysis section, a plurality of diversion plates (10) are arranged in the flue elbows above the catalysis section at equal intervals, a catalyst layer (11) is arranged in the flue main body (1) above the catalysis section, and the catalyst layer (11) is positioned above the outlet section, be located the flue elbow of spraying ammonia section top and ann has a plurality of concentric anti-circular arc fixed plates (9), be equipped with in the bottom of spraying ammonia section with anti-circular arc fixed plate (9) one-to-one positive circular arc fixed plate (7), install in flue main part (1) positive circular arc fixed plate (7), ann has a plurality of speed monitoring points (8) on the cross section in flue main part (1) between the export of positive circular arc fixed plate (7) and ammonia injection grid (2), the detected signal who comes from speed monitoring point (8) inserts the anemoscope, the anemoscope is connected with external control signal.
2. The SCR denitration flow guide system according to claim 1, wherein the adjustable flow guide structure comprises a plurality of rotating flat plates (6) uniformly arranged along the height direction of the flue, the rotating flat plates (6) divide the flue inlet flow guide section into a plurality of areas, the rotating flat plates (6) are arranged in one-to-one correspondence with the regular circular arc fixing plates (7), the end of the rotating flat plate (6) close to the flue inlet is a free end, the other end of the rotating flat plate (6) is a rotating end, a connecting shaft (4) is arranged on the rotating end of each rotating flat plate (6), the rotating flat plates (6) are rotatably connected with the corresponding regular circular arc fixing plates (7) through the connecting shafts (4), corresponding executing rods (5) are hinged below each rotating flat plate (6), and arc-shaped racks (13) coaxially rotating with the connecting shafts (4) are hinged on each executing rod (5), be equipped with on the lateral wall of arc rack (13) with the coaxial pivoted arc spout of connecting axle (4), ann has the spacing post with arc spout looks adaptation on the inner wall of flue main part (1), the meshing has gear (14) on arc rack (13), gear (14) are located the below of corresponding rotation flat board (6), coaxial rigid coupling has actuating motor on gear (14), actuating motor installs the outside at flue main part (1), actuating motor and external control signal are connected.
3. The SCR denitration flow guide system with the adjustable inclination angle of claim 1, wherein the speed monitoring points (8) are arranged at equal intervals on the same horizontal section in the flue main body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020442653.6U CN211987908U (en) | 2020-03-31 | 2020-03-31 | SCR denitration diversion system with adjustable inclination |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020442653.6U CN211987908U (en) | 2020-03-31 | 2020-03-31 | SCR denitration diversion system with adjustable inclination |
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| CN211987908U true CN211987908U (en) | 2020-11-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113694762A (en) * | 2021-08-24 | 2021-11-26 | 西安热工研究院有限公司 | Self-adaptive adjustment dynamic ammonia injection mixer |
| CN114210203A (en) * | 2021-11-01 | 2022-03-22 | 华能曲阜热电有限公司 | Control system capable of effectively controlling ammonia gas usage amount |
| CN114570202A (en) * | 2020-11-30 | 2022-06-03 | 河北林格环保科技有限公司 | Flue gas denitration system and flue gas denitration method |
-
2020
- 2020-03-31 CN CN202020442653.6U patent/CN211987908U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114570202A (en) * | 2020-11-30 | 2022-06-03 | 河北林格环保科技有限公司 | Flue gas denitration system and flue gas denitration method |
| CN113694762A (en) * | 2021-08-24 | 2021-11-26 | 西安热工研究院有限公司 | Self-adaptive adjustment dynamic ammonia injection mixer |
| CN114210203A (en) * | 2021-11-01 | 2022-03-22 | 华能曲阜热电有限公司 | Control system capable of effectively controlling ammonia gas usage amount |
| CN114210203B (en) * | 2021-11-01 | 2023-11-07 | 华能曲阜热电有限公司 | Control system capable of effectively controlling ammonia gas usage amount |
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