CN105854595A - Method for debugging SCR (selective catalytic reduction) flue gas denitrification device - Google Patents
Method for debugging SCR (selective catalytic reduction) flue gas denitrification device Download PDFInfo
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- CN105854595A CN105854595A CN201610313028.XA CN201610313028A CN105854595A CN 105854595 A CN105854595 A CN 105854595A CN 201610313028 A CN201610313028 A CN 201610313028A CN 105854595 A CN105854595 A CN 105854595A
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- flue gas
- preset value
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- 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
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- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- Environmental & Geological Engineering (AREA)
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- Health & Medical Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a method for debugging an SCR (selective catalytic reduction) flue gas denitrification device. The method includes the steps of S10, stabilizing boiler load; S20, conducting grid sampling in the positions of a plurality of outlet detection holes of the SCR flue gas denitrification device and detecting nitrogen oxide concentration in detected samples; S30, judging whether average deviation of the nitrogen oxide concentration of the samples is smaller than a first preset value or not, executing a step S40 if yes, and if not, adjusting openness of a hand valve of an ammonia injection grid until the average deviation of the nitrogen oxide concentration of the samples is smaller than the first preset value; S40, judging whether average deviation of nitrogen oxide concentration in the samples and nitrogen oxide concentration displayed on a DCS (distributed control system) is smaller than a second preset value or not, executing a step S50 if yes, and adjusting openness of the hand valve of the ammonia injection grid until the average deviation is smaller than the second preset value; S50, sealing outlet detection holes. The method for debugging the SCR flue gas denitrification device is capable of guaranteeing uniform mixing of reducing agents and nitrogen oxides in flue gas effectively so as to guarantee denitrification efficiency and reduce running cost.
Description
Technical field
The present invention relates to gas denitrifying technology field, a kind of denitrating flue gas SCR device of debugging
Method.
Background technology
In recent years, atmospheric pollution is day by day serious, and nitrogen oxides is the principal element causing atmospheric pollution
One of, the most effectively control nitrogen oxides arranges into the popular domain in order to study.
SCR (Selective Catalytic Reduction, selective catalytic reduction) is the most more
Ripe denitration technology.Selective catalytic reduction refers to, under the effect of catalyst, utilize reducing agent
(such as NH3, liquid nitrogen, carbamide) optionally with reaction of nitrogen oxides generate nontoxic pollutant
N2And H2O.At present, SCR denitration technology has become and has applied one most, maximally effective in the world
Denitration technology, its denitration efficiency is up to more than 90%.Wherein ammonia is imitated with the mixing and distribution of nitrogen oxides
Fruit is one of key factor affecting denitrating flue gas efficiency, and the most commonly used is the side of ammonia-spraying grid
Method, is divided into multiple control area varied in size by flue cross section, and there are several spray-holes in each region,
The flow of each subregion is independently adjustable, to mate nitrogen oxides in effluent (NOX) concentration distribution.
The denitrating flue gas SCR device design phase passes through CFD (Computational Fluid
Dynamics, hydrodynamics) smoothness is simulated and physical model debugging obtains SCR outlet
NOXDistribution, and NO in actual motionXDistribution average deviation is the biggest, subregion the escaping of ammonia
Concentration can exceed design certified value, and the denitration effect causing denitrating flue gas SCR device is undesirable, and
And operating cost is higher.
Therefore, the applicant is devoted to provide a kind of method debugging denitrating flue gas SCR device, its
Reducing agent (the such as NH in ammonia-spraying grid exit can be effectively ensured3) and nitrogen oxides (NOX)
It is uniformly distributed, and ammonia slip concentration can be prevented effectively from exceedes design certified value, thus be effectively improved also
The utilization rate of former dose, is further ensured that good denitration effect, effectively reduces operating cost.
Summary of the invention
It is an object of the invention to provide a kind of method debugging denitrating flue gas SCR device, it can have
Effect ensures reducing agent (the such as NH in ammonia-spraying grid exit3) and nitrogen oxides (NOX) uniformly divide
Cloth, and ammonia slip concentration can be prevented effectively from exceed design certified value, thus it is effectively improved reducing agent
Utilization rate, is further ensured that good denitration effect, effectively reduces operating cost.
For solving above-mentioned technical problem, the invention provides a kind of denitrating flue gas SCR device of debugging
Method, including step:
S10: stablize boiler load；
S20: carry out grid type sampling at multiple outlet detection holes of denitrating flue gas SCR device, and
Nitrous oxides concentration in detection sample；
S30: judge that the average deviation of the described nitrous oxides concentration of described sample is the most pre-less than first
If value, the most then perform step S40, if it is not, then adjust ammonia-spraying grid hand-operated valve aperture until
The average deviation of the nitrous oxides concentration of sample is less than the first preset value；
S40: the described nitrous oxides concentration in judgement sample and DCS (Distributed Control
System, dcs) whether the average deviation of the nitrous oxides concentration of display on central station of floating dock
Less than the second preset value, the most then perform step S50, if it is not, then adjust described ammonia-spraying grid
Hand-operated valve aperture is until the nitrogen of display on described nitrous oxides concentration in sample and DCS central station of floating dock
The average deviation of oxide concentration is less than the second preset value；
S50: close outlet detection hole.
Preferably, described first preset value is less than 10%；And/or；The scope of described second preset value
Be 5% to 10%.
It is set to the first preset value can be determined that less than 10% the nitrogen oxides at multiple outlet detection hole is dense
Spend essentially identical, the scope of the second preset value is set to 5% to 10% and then can be determined that debugging result base
This is qualified, and the denitration efficiency of denitrating flue gas SCR device is preferable.
Preferably, the method for described debugging denitrating flue gas SCR device further comprises the steps of:
S60: forward to be automatically adjusted pattern by the hand-operated valve of described ammonia-spraying grid.
Preferably, in step slo, boiler load is 500MW～600MW.
Preferably, in step slo, the fluctuating margin of boiler load is less than the initial value of boiler load
5%.
The stability that boiler load can be effectively ensured so is set, thus ensure that at outlet detection hole
The stability of gas component, thus further ensure the nitrous oxides concentration value of the gas detected
Stability.
Preferably, also including that cold conditions is debugged before described step S10, described cold conditions is debugged and is included step:
S01: open dilution air, closes for ammonia system；
S02: measure described ammonia-spraying grid air inlet pipeline orifice differential pressure；
S03: judge that whether the average deviation of pressure reduction is less than described second before and after described air inlet pipeline orifice plate
Preset value, the most then perform step S04, if it is not, the hand-operated valve then adjusting described ammonia-spraying grid is opened
Degree is until the average deviation of pressure reduction is less than the 3rd preset value before and after described air inlet pipeline orifice plate；
S04: open for ammonia system.
Can be effectively ensured, by cold conditions debugging, the air that ammonia-spraying grid regional sprays into and reach equilibrium,
Thus it is further ensured that being smoothed out of debugging.
Preferably, described 3rd preset value is in the range of 0% to 5%.
The method of the debugging denitrating flue gas SCR device of the present invention can be effectively ensured ammonia-spraying grid outlet
Place nitrogen oxides (NOX) and reducing agent (such as NH3) be uniformly distributed, effectively mix, thus have
Effect improves the utilization rate of reducing agent, it is to avoid cause reducing agent owing to reducing agent and nitrogen oxides mix inequality
Waste and the increase of operating cost, it is also possible to avoid ammonia slip concentration to exceed design certified value.This
The method of the debugging denitrating flue gas SCR device of invention can be effectively ensured denitration effect, reduces and runs
Cost.
Accompanying drawing explanation
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings:
Fig. 1 is a kind of specific embodiment of the method for the debugging denitrating flue gas SCR device of the present invention
Schematic diagram；
Fig. 2 is the another kind of specific embodiment of the method for the debugging denitrating flue gas SCR device of the present invention
Schematic diagram.
Detailed description of the invention
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below by right
In embodiment or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that,
Accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art
From the point of view of, on the premise of not paying creative work, it is also possible to obtain the attached of other according to these accompanying drawings
Figure.
Embodiment one
Embodiment one discloses a kind of method debugging denitrating flue gas SCR device, including step:
S10: stablize boiler load；
S20: carry out grid type sampling at multiple outlet detection holes of denitrating flue gas SCR device, and
Nitrous oxides concentration in detection sample；
S30: judge that the average deviation of the described nitrous oxides concentration of described sample is the most pre-less than first
If value, the most then perform step S40, if it is not, then adjust ammonia-spraying grid hand-operated valve aperture until
The average deviation of the nitrous oxides concentration of sample is less than the first preset value；
The nitrogen oxygen of display on S40: described nitrous oxides concentration in judgement sample and DCS central station of floating dock
The average deviation of compound concentration whether less than the second preset value, the most then performs step S50, if it is not,
Then adjust the hand-operated valve aperture of described ammonia-spraying grid until described nitrous oxides concentration in sample and
On DCS central station of floating dock, the average deviation of the nitrous oxides concentration of display is less than the second preset value；
S50: close outlet detection hole.
In step s 30, the average deviation between the nitrous oxides concentration at multiple outlet detection holes is little
When the first preset value, it is possible to ensure the basic phase of nitrous oxides concentration at multiple outlet detection hole
With, the first preset value here can be configured according to actual needs.
In step s 40, the nitrogen oxidation of display on the nitrous oxides concentration in sample and DCS central station of floating dock
When the average deviation of substrate concentration is less than the second preset value, it is possible to judge that debugging result is qualified, denitrating flue gas
The denitration efficiency of SCR device meets requirement, and the second preset value here can be carried out according to actual needs
Arrange.
It should be noted that in step s 40, by dense for the nitrogen oxides of display on DCS central station of floating dock
Degree also regards the detected value of the nitrous oxides concentration of a sample as, then calculates in all samples
The average deviation of nitrous oxides concentration.
In the present embodiment, multiple outlet detection holes can be denitrating flue gas SCR device all go out
Mouth detection hole, it is also possible to be the part in all outlet ports detection hole of denitrating flue gas SCR device.
Embodiment two
Compared to embodiment one, theing improvement is that of embodiment two, the debugging flue gas in embodiment two
In step S30 of the method for denitration SCR device, the first preset value is in the range of less than 10%, step
In S40, the second preset value is in the range of 5%～10%.
Certainly, in other embodiments, the first preset value and the second preset value all can be according to actual need
It is adjusted.
Embodiment three
Compared to embodiment one, theing improvement is that of embodiment three, the debugging flue gas in embodiment three
The method of denitration SCR device further comprises the steps of: S60: forward to automatically adjust by the hand-operated valve of ammonia-spraying grid
Joint pattern.
Embodiment four
Compared to embodiment one, theing improvement is that of embodiment four, the debugging flue gas in embodiment four
In step slo, boiler load is 500MW～600MW to the method for denitration SCR device, and pot
The fluctuating margin of stove load is less than the 5% of the initial value of boiler load.
Embodiment five
Compared to embodiment one, the method for the debugging denitrating flue gas SCR device in embodiment five is in step
Also including that cold conditions is debugged before rapid S10, cold conditions is debugged and is included step:
S01: open dilution air, closes for ammonia system；
S02: measure ammonia-spraying grid air inlet pipeline orifice differential pressure；
S03: judge that whether the average deviation of pressure reduction is less than the 3rd preset value before and after air inlet pipeline orifice plate,
The most then perform step S04, if it is not, the most first adjust the hand-operated valve aperture of ammonia-spraying grid until air inlet
Before and after pipeline orifice plate, the average deviation of pressure reduction is less than the 3rd preset value；
S04: open for ammonia system.
Concrete, the 3rd preset value is in the range of 0～5%.
In the present embodiment, before and after air inlet pipeline orifice plate, the average deviation of pressure reduction is just less than the 3rd preset value
Can ensure that differential pressure balancing before and after air inlet pipeline orifice plate, thus ensure being smoothed out of debugging.
The condition of cold conditions debugging is: dilution air system normal table runs, the hand-operated valve of ammonia-spraying grid
Intact；The digestion product such as water, electricity, vapour the most enough ensure.
Certainly, in other embodiments of the method for debugging denitrating flue gas SCR device, cold conditions is debugged
Step can be arranged with selectivity；The scope of the 3rd preset value can also be adjusted according to actual needs.
Embodiment six
Embodiment six is that the one of the method for the debugging denitrating flue gas SCR device of the present invention is the most preferred
Embodiment, including step:
S01: open dilution air, closes for ammonia system；
S02: measure ammonia-spraying grid air inlet pipeline orifice differential pressure；
S03: judge that whether the average deviation of pressure reduction is less than the 3rd preset value before and after air inlet pipeline orifice plate,
The most then perform step S04, if it is not, then adjust the hand-operated valve aperture of ammonia-spraying grid until air inlet pipe
Before and after the orifice plate of road, the average deviation of pressure reduction is less than the 3rd preset value；
S04: open for ammonia system；
S10: stablize boiler load；
S20: carry out grid type sampling at multiple outlet detection holes of denitrating flue gas SCR device, and
Nitrous oxides concentration in detection sample；
S30: judge that the average deviation of the described nitrous oxides concentration of described sample is the most pre-less than first
If value, the most then perform step S40, if it is not, then adjust ammonia-spraying grid hand-operated valve aperture until
The average deviation of the nitrous oxides concentration of sample is less than the first preset value；
The nitrogen oxygen of display on S40: described nitrous oxides concentration in judgement sample and DCS central station of floating dock
The average deviation of compound concentration whether less than the second preset value, the most then performs step S50, if it is not,
Then adjust the hand-operated valve aperture of ammonia-spraying grid until the nitrous oxides concentration in sample and DCS collection control
On room, the average deviation of the nitrous oxides concentration of display is less than the second preset value；
S50: close outlet detection hole；
S60: forward to be automatically adjusted pattern by the hand-operated valve of ammonia-spraying grid.
Concrete, the first preset value is less than 10%, the second preset value in the range of 5% to 10%, the
The scope of three preset values is 0% to 5%.
Concrete, in step slo, boiler load is 500MW～600MW, and boiler load
Fluctuating margin less than boiler load initial value 5%.
In the embodiment of the method for above-mentioned debugging denitrating flue gas SCR device, debugging condition is:
1) stable when operating condition, after starting debugging, combustion conditions must not be adjusted in principle,
Ensure that boiler combustion is stable, the operation such as send, the electric current of induced-draught fan and baffle opening must not be adjusted,
Relate to unit operation when must adjust safely, commissioning staff should be notified immediately；
2) during debugging, it is desirable to the ature of coal that boiler uses is basically unchanged, fuel ratio is constant；
3) during debugging, it is desirable to it is combustion-supporting that oil gun do not thrown by boiler；
4) during debugging, denitration SCR device and aid system are in serviceable condition, normal table fortune
OK；
5), during debugging, the consumable goods such as liquefied ammonia, fresh water (FW) the most enough ensures；
6), during debugging, operating mode during debugging, is adjusted on request, after debugging working condition is adjusted, must not be with
Meaning adjusts operational factor, if running into abnormal conditions, operations staff is processed voluntarily by rule of operation,
And stop debugging, notify commissioning staff.
The above is only the preferred embodiment of the present invention, it is noted that for the art
For those of ordinary skill, under the premise without departing from the principles of the invention, it is also possible to make some improvement
And retouching, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. the method debugging denitrating flue gas SCR device, it is characterised in that include step:
S10: stablize boiler load；
S20: carry out grid type sampling at multiple outlet detection holes of denitrating flue gas SCR device, and examine
Nitrous oxides concentration in test sample product；
S30: judge whether the average deviation of the described nitrous oxides concentration of described sample presets less than first
Value, the most then perform step S40, if it is not, then adjust the hand-operated valve aperture of ammonia-spraying grid until institute
State the average deviation of described nitrous oxides concentration of sample less than the first preset value；
S40: judge the nitrogen oxygen of display on the described nitrous oxides concentration of described sample and DCS central station of floating dock
The average deviation of compound concentration whether less than the second preset value, the most then performs step S50, if it is not,
Then adjust the hand-operated valve aperture of described ammonia-spraying grid until described nitrous oxides concentration in described sample
And the average deviation of the nitrous oxides concentration of display presets less than second on described DCS central station of floating dock
Value；
S50: close outlet detection hole.
2. the method debugging denitrating flue gas SCR device as claimed in claim 1, it is characterised in that:
Described first preset value is less than 10%；
With；
Described second preset value is in the range of 5% to 10%.
3. the method debugging denitrating flue gas SCR device as claimed in claim 1, it is characterised in that also wrap
Include step:
S60: forward to be automatically adjusted pattern by the hand-operated valve of described ammonia-spraying grid.
4. the method debugging denitrating flue gas SCR device as claimed in claim 1, it is characterised in that:
In step slo, boiler load is 500MW～600MW.
5. the method debugging denitrating flue gas SCR device as claimed in claim 1, it is characterised in that:
In step slo, the fluctuating margin of boiler load less than boiler load initial value 5%.
6. the method debugging denitrating flue gas SCR device as claimed in claim 1, it is characterised in that:
Also including that before described step S10 cold conditions is debugged, described cold conditions is debugged and is included step:
S01: open dilution air, closes for ammonia system；
S02: measure described ammonia-spraying grid air inlet pipeline orifice differential pressure；
S03: judge whether the average deviation of pressure reduction presets less than described second before and after described air inlet pipeline orifice plate
Value, the most then perform step S04, if it is not, the hand-operated valve aperture then adjusting described ammonia-spraying grid is straight
To described air inlet pipeline orifice plate, the average deviation of pressure reduction is less than the 3rd preset value；
S04: open for ammonia system.
7. the method debugging denitrating flue gas SCR device as claimed in claim 6, it is characterised in that:
Described 3rd preset value is in the range of 0～5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610313028.XA CN105854595A (en) | 2016-05-12 | 2016-05-12 | Method for debugging SCR (selective catalytic reduction) flue gas denitrification device |
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| CN201610313028.XA CN105854595A (en) | 2016-05-12 | 2016-05-12 | Method for debugging SCR (selective catalytic reduction) flue gas denitrification device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107703262A (en) * | 2017-10-24 | 2018-02-16 | 华北电力科学研究院有限责任公司 | A kind of method of on-line determination SCR denitration device outlet nitrogen oxides average |
| CN111482061A (en) * | 2020-04-10 | 2020-08-04 | 龙净科杰环保技术（上海）有限公司 | Device and method for recycling drainage of urea denitration system of coal-fired unit |
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| CN104880535A (en) * | 2015-03-30 | 2015-09-02 | 北京京能电力股份有限公司石景山热电厂 | Method for monitoring ammonia escape concentration |
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| CN201207023Y (en) * | 2008-05-16 | 2009-03-11 | 韩琼 | On-line measurement system for boiler discharging flue gas field |
| CN102000482A (en) * | 2010-11-15 | 2011-04-06 | 无锡科立泰科技有限公司 | System and method for controlling oxynitride removal |
| CN104880535A (en) * | 2015-03-30 | 2015-09-02 | 北京京能电力股份有限公司石景山热电厂 | Method for monitoring ammonia escape concentration |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107703262A (en) * | 2017-10-24 | 2018-02-16 | 华北电力科学研究院有限责任公司 | A kind of method of on-line determination SCR denitration device outlet nitrogen oxides average |
| CN107703262B (en) * | 2017-10-24 | 2020-06-26 | 华北电力科学研究院有限责任公司 | Method for online determination of average value of nitrogen oxides at outlet of SCR denitration device |
| CN111482061A (en) * | 2020-04-10 | 2020-08-04 | 龙净科杰环保技术（上海）有限公司 | Device and method for recycling drainage of urea denitration system of coal-fired unit |
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Application publication date: 20160817 |