CN219765004U - Automatic leveling device for speed field of coal-fired power plant denitration system - Google Patents
Automatic leveling device for speed field of coal-fired power plant denitration system Download PDFInfo
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- CN219765004U CN219765004U CN202321187494.XU CN202321187494U CN219765004U CN 219765004 U CN219765004 U CN 219765004U CN 202321187494 U CN202321187494 U CN 202321187494U CN 219765004 U CN219765004 U CN 219765004U
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- wind speed
- adjusting blade
- coal
- aig
- speed adjusting
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- 239000003054 catalyst Substances 0.000 claims abstract description 31
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 11
- 230000000630 rising effect Effects 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003546 flue gas Substances 0.000 abstract description 10
- 238000005457 optimization Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- 229910021529 ammonia Inorganic materials 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses an automatic leveling device for a speed field of a coal-fired power plant denitration system, which comprises an AIG inlet flue, an AIG outlet-to-catalyst inlet expansion flue and a catalytic reaction channel, wherein a first wind speed adjusting blade is arranged at the joint of the AIG inlet flue inlet section and a rising section, a second wind speed adjusting blade is arranged at the joint of the outlet section and the AIG outlet-to-catalyst inlet expansion flue, a first wind speed automatic measuring device is arranged in the rising section, a second wind speed automatic measuring device is arranged at the inlet end of the catalytic reaction channel, the first wind speed automatic measuring device and the second wind speed automatic measuring device are used for detecting wind speed in the channel, and a control system automatically adjusts the opening of the first wind speed adjusting blade and the opening of the second wind speed adjusting blade according to deviation of detected wind speed. The continuous and accurate monitoring of the distribution of the flue gas flow field of the denitration system and the automatic adjustment and optimization of the non-uniformity of the flow field are realized, and the uniformity of the distribution of the flow field is improved.
Description
Technical Field
The utility model relates to an automatic leveling device for a speed field of a denitration system of a coal-fired power plant, and belongs to the field of thermal power generation equipment.
Background
With the comprehensive promotion of energy conservation, emission reduction and upgrading and reformation action plans of the coal motor unit, the coal motor unit basically realizes ultra-low emission reformation, but under the condition that the unit is changeable in operation working conditions such as load, coal and the like, the distribution of a denitration flue gas flow field and a concentration field deviates from design indexes greatly, the denitration efficiency effect and the normal use of a catalyst are obviously influenced, the denitration system generally has the phenomena of uneven distribution and mixing of the flow field and the ammonia nitrogen concentration field, uneven ammonia injection, local overspray or underspray, and serious exceeding of ammonia escape of part of the unit, local catalyst abrasion and blockage.
Research at home and abroad shows that: the distribution of the temperature field, the speed field and the ammonia nitrogen concentration field of the flue gas before entering the denitration catalyst layer is closely related to the denitration efficiency and the ammonia escape rate of the denitration system. The flue gas velocity field is the most important factor, on one hand, because the catalyst is easily worn due to the too high local flow rate entering the catalyst, the residence time of the flue gas is reduced, and the catalyst is easily blocked due to the too low local flow rate, and the flow rate of a high flow rate area is further increased due to the blocking of the catalyst, so that the service life of the catalyst and the denitration efficiency are reduced; on the other hand, the speed field is an important influencing factor for uniformity of the flue gas temperature field and the mixing degree of ammonia nitrogen.
In the design process of the denitration system, the speed field is mainly realized by a guide plate and a rectification grating which are arranged in a flue, and the working condition for design is a rated load working condition. Therefore, in the actual operation process of the denitration system, the flow field distribution of the flue gas at the inlet section of the first-layer catalyst in the denitration system is uneven under the condition that devices such as the guide plate, the rectification grating and the like are complete because the guide plate structure design does not consider variable working condition factors of variable working conditions of the variable unit. In this case, the operations of dismantling the baffle and re-carrying out load design, structural optimization, etc. are definitely costly. Therefore, the movable guide plate reinforcement fixed guide plate combination is required to be researched and added on the basis of the existing denitration flue structure so as to improve the feasibility of the inlet flow field of the catalyst layer.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides the automatic leveling device for the speed field of the denitration system of the coal-fired power plant, which has the characteristics of convenience in maintenance, convenience in operation, high feasibility and high adjustment speed.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a coal fired power plant denitration system speed field automatic leveling device, its includes AIG entry flue, AIG export to catalyst entry expansion flue and catalytic reaction passageway, AIG entry flue includes the entry section, rising section and exit segment, is provided with first wind speed regulation blade in the junction of its entry section and rising section, is provided with second wind speed regulation blade in the junction of its exit segment and AIG export to catalyst entry expansion flue, is provided with first wind speed automatic measuring device in the rising section thereof, be equipped with the catalyst layer in the catalytic reaction passageway, be provided with second wind speed automatic measuring device at catalytic reaction passageway's entry end, first wind speed automatic measuring device and second wind speed automatic measuring device are used for detecting wind speed in the passageway and send detection signal to control system, control system is according to the deviation of detected wind speed with the aperture of first wind speed regulation blade and second wind speed regulation blade is automatic regulation.
Further, the initial position of the first wind speed adjusting blade is vertical upwards, and the initial position of the second wind speed adjusting blade is horizontal.
Further, the first wind speed adjusting blades are arranged in one row, and the second wind speed adjusting blades are arranged in two rows.
Further, the first wind speed adjusting blade and the second wind speed adjusting blade are both arranged on the rotating shaft, and motors are arranged at two ends of the rotating shaft.
Further, the angle adjustable range of the first wind speed adjusting blade is 30 degrees anticlockwise and 25 degrees clockwise, and the angle adjustable range of the second wind speed adjusting blade is 30 degrees anticlockwise and 35 degrees clockwise.
Further, the first wind speed adjusting blade and the second wind speed adjusting blade are rectangular in shape, and the length of each blade is smaller than the width of the AIG inlet flue and the width of the AIG outlet-to-catalyst inlet expansion flue.
Furthermore, the first wind speed adjusting blade and the second wind speed adjusting blade are made of stainless steel materials.
Further, the first wind speed automatic measuring device is provided with 4 measuring points, and the second wind speed automatic measuring device is provided with 12 measuring points.
Compared with the prior art, the utility model has the following advantages and effects:
according to the utility model, the two-stage wind speed leveling devices are arranged in the AIG inlet flue and the catalyst inlet expansion flue, the opening of the wind speed leveling blades is automatically adjusted according to the relative error of wind speed, so that continuous and accurate monitoring of flue gas flow field distribution of a denitration system and automatic adjustment and optimization of flow field non-uniformity are realized, the uniformity of flow field distribution is improved, and the flow field non-uniformity (relative speed distribution deviation) is less than or equal to +/-15%. The problems of ammonia escape exceeding caused by uneven flow field distribution and abrasion and blockage of a catalyst layer, and the like caused by downstream element blockage corrosion such as electric dust removal of an air preheater are alleviated and delayed, the abrasion and blockage of the catalyst layer are effectively alleviated, the service life of the catalyst and the service life of the air preheater are effectively prolonged, and the running economy and the safety stability of a unit and a denitration system are improved.
The method has the advantages that the ammonia nitrogen mole ratio distribution deviation before the inlet of the first layer of catalyst and the temperature field distribution deviation are obviously improved through speed field leveling, ash field distribution and flue gas incidence angle are improved, ammonia spraying amount and ammonia escape rate are reduced, the service lives of the catalyst and the air preheater are prolonged, the unit operation working condition is effectively improved, and the unit operation safety stability and economy are improved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of an automatic leveling device for a speed field of a denitration system of a coal-fired power plant.
Fig. 2 is a schematic structural diagram of a primary leveling device of the automatic leveling device for the speed field of the denitration system of the coal-fired power plant.
Fig. 3 is a schematic diagram of a secondary leveling device of the automatic leveling device for the speed field of the denitration system of the coal-fired power plant.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the automatic leveling device for the speed field of the denitration system of the coal-fired power plant comprises an AIG inlet flue 3, an AIG outlet-to-catalyst inlet expansion flue 5 and a catalytic reaction channel 7, wherein the AIG inlet flue 3 comprises an inlet section, an ascending section and an outlet section, a first wind speed adjusting blade 1 is arranged at the joint of the inlet section and the ascending section, a second wind speed adjusting blade 2 is arranged at the joint of the outlet section and the AIG outlet-to-catalyst inlet expansion flue 5, a first wind speed automatic measuring device 4 is arranged in the ascending section, a catalyst layer is arranged in the catalytic reaction channel 7, a second wind speed automatic measuring device 6 is arranged at the inlet end of the catalytic reaction channel 7, the first wind speed automatic measuring device 4 and the second wind speed automatic measuring device 6 are used for detecting wind speeds in the channel and sending detection signals to a control system, and the control system automatically adjusts the opening degrees of the first wind speed adjusting blade 1 and the second wind speed adjusting blade 2 according to deviation of detected wind speeds.
The direction of the first wind speed adjusting blade 1 is initialized and set according to the flue gas flow direction of the AIG inlet flue 3 of the denitration system, so that the resistance of the blade to the wind speed is as small as possible, namely the initial setting direction of the first wind speed adjusting blade 1 is a vertical direction and can be adjusted in the left-right direction through a motor; the direction of the wind speed adjusting blade 2 is initialized according to the direction from the AIG outlet to the catalyst inlet expansion flue 5, so that the resistance of the blade to the wind speed is as small as possible, namely, the initial setting direction of the second wind speed adjusting blade 2 is horizontal and the vertical direction can be adjusted through a motor.
As shown in fig. 2 and 3, the first wind speed adjusting blades 1 are arranged in one row, and the second wind speed adjusting blades 2 are arranged in two rows. And the first wind speed adjusting blade 1 and the second wind speed adjusting blade 2 are both installed on the rotating shaft, and motors are arranged at both ends of the rotating shaft. The angle adjustable range of the first wind speed adjusting blade 1 is 30 degrees anticlockwise and 25 degrees clockwise, and the angle adjustable range of the second wind speed adjusting blade 2 is 30 degrees anticlockwise and 35 degrees clockwise.
The first wind speed adjusting blade 1 and the second wind speed adjusting blade 2 are rectangular in shape, and the length of the blades is slightly smaller than the width of the AIG inlet flue 3 and the AIG outlet-to-catalyst inlet expansion flue 5.
The first wind speed adjusting blade 1 and the second wind speed adjusting blade 2 are made of wear-resistant materials, such as stainless steel.
The first wind speed automatic measuring device 4 comprises 4 measuring points, and the second wind speed automatic measuring device 6 comprises 12 measuring points. The device can automatically adjust the opening of the wind speed adjusting blades 1 and 2 according to the wind speed deviation displayed by the first wind speed automatic measuring device 4 and the second wind speed automatic measuring device 6.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present utility model in any way, and all technical solutions obtained by equivalent substitution and the like fall within the scope of the present utility model. The utility model is not related in part to the same as or can be practiced with the prior art.
Claims (8)
1. The utility model provides a coal fired power plant denitration system speed field automatic leveling device, its characterized in that includes AIG entry flue (3), AIG export to catalyst entry expansion flue (5) and catalytic reaction passageway (7), AIG entry flue (3) are including the entry section, rising section and exit section, are provided with first wind speed regulation blade (1) in the junction of its entry section and rising section, are provided with second wind speed regulation blade (2) in the junction of its exit section and AIG export to catalyst entry expansion flue (5), are provided with first wind speed automatic measuring device (4) in the rising section, be equipped with the catalyst layer in catalytic reaction passageway (7), be provided with second wind speed automatic measuring device (6) at catalytic reaction passageway's (7) entry end, first wind speed automatic measuring device (4) and second wind speed automatic measuring device (6) are used for detecting wind speed in the passageway and send the detected signal to control system, and control system adjusts according to the deviation of detected wind speed first wind speed regulation blade (1) and second wind speed regulation blade (2).
2. The automatic leveling device for the speed field of the denitration system of the coal-fired power plant according to claim 1 is characterized in that the initial position of the first wind speed adjusting blade (1) is vertically upward, and the initial position of the second wind speed adjusting blade (2) is horizontally.
3. The automatic leveling device for the speed field of the denitration system of the coal-fired power plant according to claim 1, wherein the first wind speed adjusting blades (1) are arranged in one row, and the second wind speed adjusting blades (2) are arranged in two rows.
4. A coal-fired power plant denitration system speed field automatic leveling device according to claim 1 or 3, characterized in that the first wind speed adjusting blade (1) and the second wind speed adjusting blade (2) are both installed on a rotating shaft, and motors are arranged at both ends of the rotating shaft.
5. The automatic leveling device for the speed field of the denitration system of the coal-fired power plant according to claim 1, wherein the angle adjustable range of the first wind speed adjusting blade (1) is 30 degrees anticlockwise and 25 degrees clockwise, and the angle adjustable range of the second wind speed adjusting blade (2) is 30 degrees anticlockwise and 35 degrees clockwise.
6. The automatic leveling device for the speed field of the denitration system of the coal-fired power plant according to claim 1, wherein the first wind speed adjusting blade (1) and the second wind speed adjusting blade (2) are rectangular in shape, and the length of the blades is smaller than the width of the AIG inlet flue (3) and the AIG outlet-to-catalyst inlet expansion flue (5).
7. The automatic leveling device for the speed field of the denitration system of the coal-fired power plant according to claim 1 is characterized in that the first wind speed adjusting blade (1) and the second wind speed adjusting blade (2) are made of stainless steel materials.
8. The automatic leveling device for the speed field of the denitration system of the coal-fired power plant according to claim 1, wherein the first automatic measuring device (4) for wind speed is provided with 4 measuring points, and the second automatic measuring device (6) for wind speed is provided with 12 measuring points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321187494.XU CN219765004U (en) | 2023-05-17 | 2023-05-17 | Automatic leveling device for speed field of coal-fired power plant denitration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321187494.XU CN219765004U (en) | 2023-05-17 | 2023-05-17 | Automatic leveling device for speed field of coal-fired power plant denitration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219765004U true CN219765004U (en) | 2023-09-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321187494.XU Active CN219765004U (en) | 2023-05-17 | 2023-05-17 | Automatic leveling device for speed field of coal-fired power plant denitration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219765004U (en) |
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2023
- 2023-05-17 CN CN202321187494.XU patent/CN219765004U/en active Active
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