CN113694762A - Self-adaptive adjustment dynamic ammonia injection mixer - Google Patents
Self-adaptive adjustment dynamic ammonia injection mixer Download PDFInfo
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- CN113694762A CN113694762A CN202110976471.6A CN202110976471A CN113694762A CN 113694762 A CN113694762 A CN 113694762A CN 202110976471 A CN202110976471 A CN 202110976471A CN 113694762 A CN113694762 A CN 113694762A
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- mixer
- main shaft
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- output end
- ammonia injection
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 33
- 238000002347 injection Methods 0.000 title claims description 20
- 239000007924 injection Substances 0.000 title claims description 20
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 17
- 239000003546 flue gas Substances 0.000 claims description 15
- 239000000779 smoke Substances 0.000 claims description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a self-adaptive adjustment dynamic ammonia spraying mixer, which comprises a control system, an electric actuating mechanism, a mixer group opening control main shaft and a plurality of mixer units, wherein the mixer group opening control main shaft is connected with the electric actuating mechanism; each mixer unit comprises a mixer unit rotating main shaft and a plurality of mixer blades, wherein each mixer blade is connected with the mixer unit rotating main shaft through a mixer blade hinge, an output shaft of the electric actuating mechanism is connected with a mixer group opening degree control main shaft, the mixer group opening degree control main shaft is connected with the mixer unit rotating main shaft in each mixer unit, an output end of the control system is connected with a control end of the electric actuating mechanism, and the system can dynamically control the uniform mixing degree of components in a flue.
Description
Technical Field
The invention belongs to the field of flue gas denitration treatment, and relates to a self-adaptive adjustment dynamic ammonia injection mixer.
Background
At present, SCR technology is commonly adopted for denitration in the industries of thermal power, steel, coking and the like, and the principle is that a product NH obtained by converting a reducing agent (such as liquid ammonia, urea and ammonia water) by means of an ammonia injection grid is adopted3After spraying into flue, with NOxOxidation reduction reaction is carried out to generate N under the action of catalyst2And H2And O. The length of the flue between the ammonia injection grid and the catalyst is usually short, taking into account site conditions and capital investment constraints for the revamping, and therefore the NH in the flue gas3And NOxThe mixing uniformity is often not good enough, and NH exists in the flue gas entering the catalyst3/NOxThe area obviously deviating from the theoretical stoichiometric ratio causes local ammonia escape and NO at the denitration outletxThe high concentration condition leads to some problems such as air preheater jam, the flue gas hangs upside down, automatic system can't be put into operation. Thus to ensure NOxThe efficient and uniform removal needs to be realized by additionally arranging a mixer after the ammonia spraying grid.
On the other hand, inlet NO at different loads in actual operationxThe concentration distribution law and the resistance of the smoke and wind system are different: inlet NO at normal high load under the same unit and coal qualityxThe concentration and deviation are low when the load is low, but the flue gas amount is large, if the operation condition of the air preheater is not good enough, the resistance of the denitration system needs to be controlled; at low load although NOxThe concentration and the deviation are large when the load is high, but the whole smoke volume is small, the induced draft fan outputs enough power, in order to ensure the mixing effect, the windward area of the mixer can be properly increased, and the forced disturbance effect on the smoke is enhanced. The conventional mixers are static mixers, and the parameters during design are all based on full loadUnder the load condition, the flue gas condition, the shape, the size and the arrangement position of the mixer cannot be adjusted once the mixer is installed and determined, and the mixer has no adaptability. Along with the implementation of deep peak regulation, the denitration system of the unit is required to meet the requirement of any interval from full load to minimum stable combustion load.
Therefore, the conventional ammonia spraying mixer cannot completely meet the operation requirement of the existing unit, and a dynamic ammonia spraying mixing system with a self-adaptive adjusting function needs to be designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an adaptive adjustment dynamic ammonia injection mixer, which can dynamically control the uniform mixing degree of components in a flue.
In order to achieve the aim, the self-adaptive adjustment dynamic ammonia spraying mixer comprises a control system, an electric actuating mechanism, a mixer group opening control main shaft and a plurality of mixer units; each mixer unit comprises a mixer unit rotating main shaft and a plurality of mixer blades, wherein each mixer blade is connected with the mixer unit rotating main shaft through a mixer blade hinge, an output shaft of the electric actuating mechanism is connected with a mixer group opening degree control main shaft, the mixer group opening degree control main shaft is connected with the mixer unit rotating main shafts in each mixer unit, and an output end of the control system is connected with a control end of the electric actuating mechanism.
The control system comprises a data processing module, a function module, a high-low limit module, a first barometer, a second barometer, a deviation module, a PID controller and a calculation module;
the calculation module is used for calculating concentration relative deviation, the first barometer is used for detecting the air pressure at the inlet of the ammonia spraying mixer, the second barometer is used for detecting the air pressure at the outlet of the ammonia spraying mixer, the input end of the function module is connected with the output end of the data processing module, the output end of the function module is connected with the input end of the high-low limit module, the output end of the first barometer and the output end of the second barometer are connected with the input end of the deviation module, the output end of the deviation module is connected with the input end of the high-low limit module, the output end of the high-low limit module is connected with the input end of the PID controller, the output end of the calculation module is connected with the input end of the PID controller, and the output end of the PID controller is connected with the control end of the electric execution mechanism.
The electric actuating mechanism controls the main shaft to drive the rotating main shaft of the mixer unit to rotate through the opening of the mixer group, and synchronously adjusts the opening of each mixer blade by adjusting the rotating angle of the rotating main shaft of the mixer unit.
The opening control main shaft of the mixer group is vertical to the flowing direction of the flue gas, and all the mixer units are sequentially arranged along the flowing direction of the flue gas.
Calculating the concentration relative deviation delta by a calculation module as:
wherein NOxiIs the concentration value of the test region, n is the number of regions, NOxaveIs the average of the concentrations in all regions.
The data processing module is based on NO at the inlet of the mixerxConcentration, NO at mixer outletxAnd calculating the smoke gas amount according to the concentration and the ammonia injection amount, wherein,
(NO at the mixer inletxNO at the outlet of the concentration mixerxConcentration) total smoke gas amount gas (ammonia injection amount) alpha
Wherein alpha is a fixed constant, and the derivative variable gas is used as a total smoke gas trend calibration index.
The invention has the following beneficial effects:
when the self-adaptive adjustment dynamic ammonia injection mixer is operated specifically, the electric actuating mechanism is controlled by the control system to dynamically control the uniform mixing degree of components in the flue so as to meet the requirement of inlet NO under the conditions of different loads, different coal qualities, different grinding groups and the likexThe concentration changes, realizes the anticipated mixed effect with the most reasonable resistance value to for the high-efficient utilization of catalyst provides powerful support, improve the utilization ratio of denitration reductant, reduce cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2a is a schematic diagram of a dynamic mixer set in a half-on state;
FIG. 2b is a schematic diagram of the dynamic mixer set in a fully open state;
fig. 3 is a control logic diagram of the dynamic mixer.
Wherein, 1 is a mixer blade, 2 is a mixer blade hinge, 3 is a mixer unit rotating main shaft, 4 is a mixer group opening degree control main shaft, and 5 is an electric actuating mechanism.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, fig. 2a and fig. 2b, the self-adaptive dynamic ammonia injection mixer according to the present invention includes an electric actuator 5, a mixer group opening degree control main shaft 4 and a plurality of mixer units, each mixer unit includes a mixer unit rotating main shaft 3 and a plurality of mixer blades 1, wherein each mixer blade 1 is connected to the mixer unit rotating main shaft 3 through a mixer blade hinge 2, an output shaft of the electric actuator 5 is connected to the mixer group opening degree control main shaft 4, the mixer group opening degree control main shaft 4 is connected to the mixer unit rotating main shaft 3 in each mixer unit, and an output end of the control system is connected to a control end of the electric actuator 5.
Referring to fig. 3, the control system includes a data processing module, a function module 6, a high-low limit module 8, a first barometer, a second barometer, a deviation module 7, a PID controller 9, and a calculation module;
the electric actuator 5 drives the mixer unit rotating main shaft 3 to rotate through the mixer group opening degree control main shaft 4, and synchronously adjusts the opening degree of each mixer blade 1 by adjusting the rotating angle of the mixer unit rotating main shaft 3, as shown in fig. 2.
In operation, NH3Enters the flue gas through an ammonia spraying grid and NO in the flue gasxThe components are strongly rotated under the action of a dynamic mixer, so that uniform mixing is realized.
The opening control main shaft 4 of the mixer group is vertical to the flowing direction of the flue gas, and all the mixer units are sequentially arranged along the flowing direction of the flue gas.
During operation, the pressure difference value of the inlet and the outlet of the smoke and NO at the outlet are obtainedxWhen the mixing intensity of the flue gas is insufficient, the opening degree of the mixer blade 1 is increased through the electric actuator 5;
wherein NO is passed through the mixer outletxRelative standard deviation of distribution to measure NOxThe uniformity of the concentration, wherein the relative deviation delta of the concentration is calculated by the calculation module as:
wherein NOxiIs the concentration value of the test region, n is the number of regions, NOxaveIs the average of the concentrations in all regions.
Data processing moduleBy NO at the inlet of the mixerxConcentration, NO at mixer outletxAnd calculating the smoke gas amount according to the concentration and the ammonia injection amount, wherein,
(NO at the mixer inletxNO at the outlet of the concentration mixerxConcentration) total smoke gas amount gas (ammonia injection amount) alpha
Wherein alpha is a fixed constant, a derivative variable gas is calculated to serve as a trend calibration index of the total smoke gas amount, the unit load, the total air amount, the oxygen amount and the total coal supply amount are selected to serve as input variables, the smoke gas amount serves as an output amount, and a soft measurement model of the smoke gas amount Q is established through a regression algorithm.
The input end of the function module 6 is connected with the output end of the data processing module, the output end of the function module 6 is connected with the input end of the high-low limit module 8, the first barometer is used for detecting the air pressure at the inlet of the ammonia spraying mixer, the second barometer is used for detecting the air pressure at the outlet of the ammonia spraying mixer, the output end of the first barometer and the output end of the second barometer are connected with the input end of the deviation module 7, the output end of the deviation module 7 is connected with the input end of the high-low limit module 8, the output end of the high-low limit module 8 is connected with the input end of the PID controller 9, the calculation module is used for calculating the relative concentration deviation, the output end of the calculation module is connected with the input end of the PID controller 9, and the output end of the PID controller 9 is connected with the control end of the electric execution mechanism 5.
Claims (6)
1. A self-adaptive adjustment dynamic ammonia injection mixer is characterized by comprising a control system, an electric actuating mechanism (5), a mixer group opening control main shaft (4) and a plurality of mixer units; each mixer unit comprises a mixer unit rotating main shaft (3) and a plurality of mixer blades (1), wherein each mixer blade (1) is connected with the mixer unit rotating main shaft (3) through a mixer blade hinge (2), an output shaft of an electric actuating mechanism (5) is connected with a mixer group opening degree control main shaft (4), the mixer group opening degree control main shaft (4) is connected with the mixer unit rotating main shafts (3) in each mixer unit, and an output end of a control system is connected with a control end of the electric actuating mechanism (5).
2. The adaptive adjustment dynamic ammonia injection mixer according to claim 1, wherein the control system comprises a data processing module, a function module (6), a high-low limit module (8), a first barometer, a second barometer, a deviation module (7), a PID controller (9) and a calculation module;
the calculation module is used for calculating concentration relative deviation, the first barometer is used for detecting the air pressure at the inlet of the ammonia spraying mixer, the second barometer is used for detecting the air pressure at the outlet of the ammonia spraying mixer, the input end of the function module (6) is connected with the output end of the data processing module, the output end of the function module (6) is connected with the input end of the high-low limit module (8), the output end of the first barometer and the output end of the second barometer are connected with the input end of the deviation module (7), the output end of the deviation module (7) is connected with the input end of the high-low limit module (8), the output end of the high-low limit module (8) is connected with the input end of the PID controller (9), the output end of the calculation module is connected with the input end of the PID controller (9), and the output end of the PID controller (9) is connected with the control end of the electric execution mechanism (5).
3. The self-adaptive adjusting dynamic ammonia injection mixer according to claim 1, wherein the electric actuator (5) drives the mixer unit rotating main shaft (3) to rotate through the mixer group opening degree control main shaft (4), and the opening degree of each mixer blade (1) is synchronously adjusted through adjusting the rotating angle of the mixer unit rotating main shaft (3).
4. The self-adaptive adjusting dynamic ammonia injection mixer according to claim 1, wherein the opening control main shaft (4) of the mixer group is vertical to the flow direction of the flue gas, and all mixer units are arranged in sequence along the flow direction of the flue gas.
5. The adaptively adjusted dynamic ammonia injection mixer of claim 1, wherein the calculation module calculates the relative concentration deviation δ as:
wherein NOxiIs the concentration value of the test region, n is the number of regions, NOxaveIs the average of the concentrations in all regions.
6. The adaptively adjusting dynamic ammonia injection mixer of claim 1 wherein the data processing module is responsive to NO at the mixer inletxConcentration, NO at mixer outletxAnd calculating the smoke gas amount according to the concentration and the ammonia injection amount, wherein,
(NO at the mixer inletxNO at the outlet of the concentration mixerxConcentration) total smoke gas amount gas (ammonia injection amount) alpha
Wherein alpha is a fixed constant, and the derivative variable gas is used as a total smoke gas trend calibration index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110976471.6A CN113694762A (en) | 2021-08-24 | 2021-08-24 | Self-adaptive adjustment dynamic ammonia injection mixer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110976471.6A CN113694762A (en) | 2021-08-24 | 2021-08-24 | Self-adaptive adjustment dynamic ammonia injection mixer |
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Citations (14)
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|---|---|---|---|---|
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| US20060115402A1 (en) * | 2003-07-03 | 2006-06-01 | Fuel Tech, Inc. | SELECTIVE CATALYTIC REDUCTION OF NOx ENABLED BY SIDESTREAM UREA DECOMPOSITION |
| CN204582950U (en) * | 2015-04-29 | 2015-08-26 | 华电国际电力股份有限公司技术服务中心 | Denitration in Boiler spray ammonia grid guiding device |
| CN204638000U (en) * | 2015-04-21 | 2015-09-16 | 北京国电龙源环保工程有限公司 | A kind of reducing agent mixing arrangement being applied to SCR denitrating flue gas |
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| CN112275133A (en) * | 2020-11-12 | 2021-01-29 | 西安热工研究院有限公司 | A denitration control system and method based on the adjustment of flue gas mixing uniformity of coal-fired units |
| CN212458075U (en) * | 2020-09-18 | 2021-02-02 | 西安热工研究院有限公司 | An automatic control system for uniformity of gas flow field |
| CN112316689A (en) * | 2020-10-22 | 2021-02-05 | 华北电力大学 | Low temperature oxidation denitration process ozone distributes and strengthens hybrid system |
-
2021
- 2021-08-24 CN CN202110976471.6A patent/CN113694762A/en active Pending
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| US20060115402A1 (en) * | 2003-07-03 | 2006-06-01 | Fuel Tech, Inc. | SELECTIVE CATALYTIC REDUCTION OF NOx ENABLED BY SIDESTREAM UREA DECOMPOSITION |
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