CN108816043A - A kind of denitration device and its autocontrol method - Google Patents
A kind of denitration device and its autocontrol method Download PDFInfo
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- CN108816043A CN108816043A CN201810577952.8A CN201810577952A CN108816043A CN 108816043 A CN108816043 A CN 108816043A CN 201810577952 A CN201810577952 A CN 201810577952A CN 108816043 A CN108816043 A CN 108816043A
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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
- B01D53/90—Injecting reactants
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/013—Single phase liquid
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- 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 kind of denitration device and its autocontrol methods,Including gas transmission mechanism and SCR reactor,The gas transmission mechanism includes two evaporators,And the side of evaporator is respectively arranged with the first liquefied ammonia storage tank and the second liquefied ammonia storage tank,First liquefied ammonia storage tank and the second liquefied ammonia storage tank pass through ammonia inlet pipe and connect with corresponding evaporator,And ammonia inlet pipe and the first liquefied ammonia storage tank,The junction of second liquefied ammonia storage tank is separately installed with first for ammonia pitch and second for ammonia pitch,The side of the evaporator passes through evaporation tube and is connected with mixer,And the first solenoid valve is installed on evaporation tube,The side of the mixer is respectively connected with air inlet lines,And second solenoid valve is installed in the junction of air inlet lines and mixer,The device can inevitably apparatus factor takes into account in control strategy by the total feedforward factor of boiler operatiopn and instrument etc.,Avoid the generation out of control when automatic control,Be conducive to improve the denitration effect of equipment.
Description
Technical field
The present invention relates to coal-fired out of stock field, specially a kind of denitration device and its autocontrol method.
Background technique
Denitration, which refers to the process of, removes denitrification in combustion product gases, antipollution importance has been used as the world
The problem of range and be shrilly contemplated.The technique for comparing mainstream in the world is divided into：SCR and SNCR.Both techniques are removed
Since SCR causes reaction temperature ratio SNCR low outer using catalyst, other have no too big difference, but if from construction cost and
From the point of view of two angles of operating cost, the investment of SCR is at least the several times that SNCR is put into or even 10 times more than.
SCR is most mature gas denitrifying technology at present, it is method of denitration after a kind of furnace, be using reducing agent (NH3,
Urea) under metallic catalyst effect, it is selectively reacted with NOx and generates N2 and H2O, rather than aoxidized by O2, therefore it is known as " choosing
Selecting property ".Popular SCR technique is broadly divided into ammonia process SCR and urea method SCR2 kind in the world.This 2 kinds of methods are all to utilize ammonia pair
The restoring function of NOx, under the effect of the catalyst by NOx (mainly NO) be reduced on atmosphere be not much influence N2 and
Water, reducing agent NH3.
The catalyst used in SCR is activity with V2O5 or V2O5-WO3 or V2O5-MoO3 mostly using TiO2 as carrier
Cellular, board-like or corrugated three types are made in ingredient.High temperature can be divided into applied to the SCR catalyst in denitrating flue gas to urge
Agent (345 DEG C~590 DEG C), middle temperature catalyst (260 DEG C~380 DEG C) and low temperature catalyst (80 DEG C~300 DEG C), different urges
The suitable reaction temperature of agent is different.
Existing SCR denitration equipment generally includes two equipped with the reactors of catalyst, two liquefied ammonia storage tanks and a set of
Ammonia injected system.Liquefied ammonia from storage tank enters in evaporator by the pressure of itself.The sky that ammonia comes via dilution air
Gas is injected into flue gas in ammonia/air mixer mixed diluting by injected system, and the ammonia and flue gas being diluted exist
Enter two layers of catalyst after being thoroughly mixed before SCR uniformly, and then generate chemical reaction, nitrogen oxides is just removed.Boiler point
A bis- side B, every side has one for ammonia pitch, which carries out the control to ammonia spraying amount, contains to participate in control exit stack NOx
Amount, and two pitch keep balance, phenomena such as preventing the old dead of catalyst or block.
But existing denitration device and its autocontrol method have the following defects：
(1) when measuring ammonia spraying amount and exhaust outlet NOx content, need to use CEMS analysis meter, but at present
The NOx come measured by CEMS analysis meter practical is NO value, and when CEMS analysis meter measures needs regular purge, to it is each at
The content divided also has large effect, so that the precision that device automatically controls is not high；
(2) equipment can all have an impact NOx content when increasing, load shedding and starting, stopping coal pulverizer；
(3) existing denitration device in denitration, deposit with NOx measurement at desulfuration chimney by SCR reactor outlet NOx measured value
In relatively large deviation, so that the denitration effect of device is undesirable.
Summary of the invention
In order to overcome the shortcomings of prior art, the present invention provides a kind of denitration device and its autocontrol method, should
Device can inevitably apparatus factor takes into account in control strategy by the total feedforward factor of boiler operatiopn and instrument etc., keeps away
The generation out of control when automatically controlling is exempted from, has been conducive to the denitration effect for improving equipment, can effectively solve what background technique proposed
Problem.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of denitration device, including gas transmission mechanism and SCR reactor, the gas transmission mechanism includes two evaporators, and is steamed
The side of hair device is respectively arranged with the first liquefied ammonia storage tank and the second liquefied ammonia storage tank, the first liquefied ammonia storage tank and the second liquid
Ammonia storage tank passes through ammonia inlet pipe and connects with corresponding evaporator, and ammonia inlet pipe and the first liquefied ammonia storage tank, the second liquefied ammonia
The junction of storage tank is separately installed with first for ammonia pitch and second for ammonia pitch；
The side of the evaporator passes through evaporation tube and is connected with mixer, and the first electromagnetism is equipped on evaporation tube
Valve, the side of the mixer is respectively connected with air inlet lines, and is equipped with the second electricity in the junction of air inlet lines and mixer
Magnet valve.
Further, the mixer passes through mixing tube relative to the other side of air inlet lines and is connected with flue gas storehouse, and
Third solenoid valve is installed on mixing tube, the side in the flue gas storehouse is respectively connected with fume pipe, and sets in the nozzle of fume pipe
It is equipped with the 4th solenoid valve.
Further, the flue gas storehouse passes through processing pipe relative to the other side of mixing tube and connect with SCR reactor, and
The junction in processing pipe and flue gas storehouse is mounted on the 5th solenoid valve, and the nozzle of the processing pipe is provided with entrance CEMS analysis
Instrument.
Further, the SCR reactor includes handling the first catalytic reactor that pipe is connect, and the first catalysis with two
The side of reactor is connected with the second catalytic reactor by catalysing tube, and the 6th solenoid valve is equipped on the catalysing tube.
Further, the side of second catalytic reactor is connected with exhaust pipe, and anti-in exhaust pipe and the second catalysis
The junction of device is answered to be provided with the 7th solenoid valve, the nozzle of the exhaust pipe is equipped with outlet CEMS analysis meter.
In addition, including the following steps the present invention also provides a kind of denitration autocontrol method:
Step 100 sets several feed-forward signals according to system disturbance；
Step 200, value and difference and feed-forward signal the adjustment spray ammonia of the reduced value of exhaust pipe NOx according to setting NOx
Amount.Further, as a kind of preferred embodiment of the invention, system disturbance includes the hysteresis quality of SCR system itself, denitration
The influence when fluctuation of entrance NOx, the load variations of SCR system, SCR system mill switching.
Further, it as a kind of preferred embodiment of the invention, is set and is feedovered according to the hysteresis quality of SCR system itself
The specific method of signal is：It defines the reduced value of exhaust pipe NOx and set the difference of NOx value as first via feed-forward signal, and this
The size of difference is determined by the characteristic that test obtains valve；
According to the fluctuation of denitration entrance NOx set the specific method of feed-forward signal as：When entrance NOx analyzer does not purge
When, entrance NOx variable quantity is directly defined as the second road feed-forward signal；When entrance NOx analyzer purging, it is first determined entrance
The measured value of two sides NOx, the ratio for then defining entrance two sides NOx measured value are multiplied by the measured value of other side entrance NOx
Second road feed-forward signal；
According to the load variations of SCR system set the specific method of feed-forward signal as：Defining load variations amount first is the
Three road feed-forward signals；
Further, as a kind of preferred embodiment of the invention, before grinding influence setting when switching according to SCR system
The specific method of feedback signal is：1.5 aperture amount is provided, manually before running or cutting for balancing mill start and stop to discrepancy
It is influenced caused by mouth NOx amount.
Further, as a kind of preferred embodiment of the invention, PID output is referred in the pid parameter of the system
The limitation for having carried out 35 lower limit 10 of the upper limit is enabled, the limitation of 45 lower limit 10 of the upper limit has also been carried out to automatic command general export.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention can go out NOx reduced value by the calculated with actual values of exhaust pipe NOx, and by the value of setting NOx with
The difference of the reduced value of exhaust pipe NOx and the hysteresis quality of system itself adjust ammonia spraying amount, advantageously ensure that the denitration of equipment
Effect；
(2) present invention adjusts ammonia spraying amount according to the fluctuation of processing pipe nozzle NOx and the variation of load, meanwhile, it is capable to
Consider to influence brought by entrance CEMS analysis meter regular purge, makes valve work ahead, the denitration to equipment is avoided to generate
It influences；
(3) present invention can be adjusted according to Site for Unit practical operation situation, and mill is avoided to generate when switching to denitration
It influences, meanwhile, it is capable to prevent from substantially reducing the exceeded probability of exhaust pipe nozzle NOx for ammonia pitch toning.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is overall flow schematic diagram of the invention.
Figure label：
1- gas transmission mechanism；2-SCR reactor；
101- evaporator；102- the first liquefied ammonia storage tank；103- the second liquefied ammonia storage tank；104- ammonia inlet pipe；105-
One for ammonia pitch；106- second is for ammonia pitch；107- evaporation tube；108- mixer；The first solenoid valve of 109-；110- air into
Pipe；111- second solenoid valve；112- mixing tube；113- flue gas storehouse；114- third solenoid valve；115- fume pipe；The 4th electricity of 116-
Magnet valve；117- processing pipe；The 5th solenoid valve of 118-；119- entrance CEMS analysis meter；
The first catalytic reactor of 201-；202- catalysing tube；The second catalytic reactor of 203-；The 6th solenoid valve of 204-；205-
Exhaust pipe；The 7th solenoid valve of 206-；207- exports CEMS analysis meter.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of denitration device, including gas transmission mechanism 1 and SCR reactor 2, the gas transmission
Mechanism 1 includes two evaporators 101, and the side of evaporator 101 is respectively arranged with the first liquefied ammonia storage tank 102 and the second liquefied ammonia
Storage tank 103, the first liquefied ammonia storage tank 102 and the second liquefied ammonia storage tank 103 pass through ammonia inlet pipe 104 and corresponding steaming
It sends out device 101 to connect, and ammonia inlet pipe 104 and the junction of the first liquefied ammonia storage tank 102, the second liquefied ammonia storage tank 103 are pacified respectively
Equipped with first for ammonia pitch 105 and second for ammonia pitch 106.
First liquefied ammonia storage tank 102 and the second liquefied ammonia storage tank 103 are provided with liquefied ammonia, and liquefied ammonia can be in pressure itself
Enter in evaporator 101 under effect along ammonia inlet pipe 104, and be converted into gaseous state from liquid in evaporator 101, first for ammonia
Pitch 105 and second is respectively used to being adjusted for ammonia amount to two liquefied ammonia storage tanks for ammonia pitch 106.
The side of the evaporator 101 passes through evaporation tube 107 and is connected with mixer 108, and installs on evaporation tube 107
Have the first solenoid valve 109, the side of the mixer 108 is respectively connected with air inlet lines 110, and air inlet lines 110 with mix
The junction of device 108 is equipped with second solenoid valve 111.
Evaporation tube 107 is used to for ammonia gaseous in evaporator 101 being sent into mixer 108, and the first solenoid valve 109 is for controlling
The on-off of evaporation tube 107 processed, air inlet lines 110 enable ammonia to be diluted into one for being passed through air into mixer 108
Certainty ratio, second solenoid valve 111 are used to control the on-off of air inlet lines 110.
The mixer 108 passes through mixing tube 112 relative to the other side of air inlet lines 110 and is connected with flue gas storehouse 113,
And third solenoid valve 114 is installed on mixing tube 112, the side in the flue gas storehouse 113 is respectively connected with fume pipe 115, and
The nozzle of fume pipe 115 is provided with the 4th solenoid valve 116.
Ammonia after mixing tube 112 is used to dilute is sent into flue gas storehouse 113, and third solenoid valve 114 is for controlling mixing
The on-off of pipe 112, fume pipe 115 are used to for coal fire discharged flue gas being sent into flue gas storehouse 113, and in flue gas storehouse 113 and ammonia
Gas is sufficiently mixed, and the 4th solenoid valve 116 is used to control the on-off of fume pipe 115.
The flue gas storehouse 113 passes through processing pipe 117 relative to the other side of mixing tube 112 and connect with SCR reactor 2,
And the junction for handling pipe 117 and flue gas storehouse 113 is mounted on the 5th solenoid valve 118, the nozzle of the processing pipe 117 is respectively provided with
There is entrance CEMS analysis meter 119.
It handles pipe 117 to be used to for the mixed gas of flue gas, ammonia being sent into SCR reactor 2, and complete in SCR reactor 2
It is operated at denitration, the 5th solenoid valve 118 is used to control the on-off of processing pipe 117, and entrance CEMS analysis meter 119 for surveying respectively
Measure be sent into out of processing pipe 117 flue gas in SCR reactor 2, in ammonia gas mixture body NOx variable quantity.
The SCR reactor 2 includes handling the first catalytic reactor 201 that pipe 117 is connect with two, and the first catalysis is anti-
It answers the side of device 201 to be connected with the second catalytic reactor 203 by catalysing tube 202, the 6th electricity is installed on the catalysing tube 202
Magnet valve 204.
It is respectively arranged with catalyst in first catalytic reactor 201 and the second catalytic reactor 203, so that flue gas, ammonia
Mixed gas can complete denitration operation, catalysing tube 202 is for connecting the first catalytic reactor successively by catalysis reaction twice
201 and second catalytic reactor 203, and flue gas, ammonia gas mixture body can be made sufficiently anti-in the first catalytic reactor 201
It answers, the 6th solenoid valve 204 is used to control the on-off of catalysing tube 202.
The side of second catalytic reactor 203 is connected with exhaust pipe 205, and anti-in exhaust pipe 205 and the second catalysis
The junction of device 203 is answered to be provided with the 7th solenoid valve 206, the nozzle of the exhaust pipe 205 is equipped with outlet CEMS analysis meter
207。
Exhaust pipe 205 is used to discharge gas after denitration, and is sent to downsteam processing facilities, and can make flue gas,
Ammonia gas mixture body is sufficiently reacted in the second catalytic reactor 203, and the 7th solenoid valve 206 is for controlling exhaust pipe 205
On-off, outlet CEMS analysis meter 207 is used to measure the value of NOx in discharge gas, to judge whether equipment reaches environmentally friendly row
The standard put.
In addition, as shown in Fig. 2, including the following steps the present invention also provides a kind of denitration autocontrol method：
Step 100 sets several feed-forward signals according to system disturbance；
Step 200, value and difference and feed-forward signal the adjustment spray ammonia of the reduced value of exhaust pipe NOx according to setting NOx
Amount.In above-mentioned steps, system disturbance include the hysteresis quality of SCR system itself, the fluctuation of denitration entrance NOx, SCR system it is negative
Influence when lotus variation, SCR system mill switching.
Further, set according to the hysteresis quality of SCR system itself the specific method of feed-forward signal as：Define exhaust pipe
The reduced value of NOx with set the difference of NOx value as first via feed-forward signal, and the size of the difference is by testing acquisition valve
Characteristic determines；
According to the fluctuation of denitration entrance NOx set the specific method of feed-forward signal as：When entrance NOx analyzer does not purge
When, entrance NOx variable quantity is directly defined as the second road feed-forward signal；When entrance NOx analyzer purging, it is first determined entrance
The measured value of two sides NOx, the ratio for then defining entrance two sides NOx measured value are multiplied by the measured value of other side entrance NOx
Second road feed-forward signal；
According to the load variations of SCR system set the specific method of feed-forward signal as：Defining load variations amount first is the
Three road feed-forward signals.
In above-mentioned steps, feed-forward signal obtained can make valve advancement certain by f (x) function
Amount, to obtain the lead that accurately controls, and the lead is related with valve characteristic, that is to say, that in practical operation
In, valve characteristic can be obtained according to the test of limited times and obtain f (x), and then obtain lead.
And among the above, it is also necessary to, it is emphasized that going out the reduced value of NOx, calculation formula using the calculated with actual values of NOx
For：NOx reduced value=15/ (21-O of NOx actual value *2Actual value) * 1.53, wherein O2Actual value is current oxygen content value.
In addition, according to SCR system grind influence when switching set the specific method of feed-forward signal as：It is running or is cutting
1.5 aperture amount is provided, manually before for balancing mill start and stop influence caused by entrance NOx amount.
In embodiments, the limit of 35 lower limit 10 of the upper limit has been carried out to PID output order in the pid parameter of the system
System, the limitation of 45 lower limit 10 of the upper limit has also been carried out to automatic command general export.
By total feedforward factor of boiler operatiopn and instrument etc., inevitably apparatus factor takes into account control to this control method
The problems in system strategy, avoid the generation out of control when automatic control, the existing denitration of effective solution automatically controls.
In conjunction with above-mentioned apparatus, the specific operating process of present embodiment is as described below：
First, denitration device is run, and ammonia and flue gas are mixed in gas transmission mechanism, and is delivered to SCR reaction
Denitration is carried out in device.
Then real according to the hysteresis quality of the difference and system itself of the value of setting NOx and the reduced value of exhaust pipe NOx
When adjustment first for ammonia pitch and second for ammonia pitch ammonia spraying amount, advantageously ensure that the denitration effect of equipment, further root
According to processing pipe nozzle NOx fluctuation and load variation, in real time adjustment first for ammonia pitch and second for ammonia pitch spray
Ammonia amount avoids having an impact the denitration of equipment, furthermore actual conditions when being switched according to mill, and avoids first for ammonia tune
Door, second optimize automatic control system, can reduce the exceeded probability of exhaust pipe nozzle NOx for ammonia pitch toning.
In above-mentioned steps, denitration device operation the specific steps are：
The liquefied ammonia of first liquefied ammonia storage tank and the second liquefied ammonia storage tank can respectively enter corresponding under the pressure of itself
In evaporator, and gaseous state is converted to, gaseous ammonia can enter in corresponding mixer through evaporation tube respectively, and mixed with air
Dilution is closed, the ammonia after dilution can enter flue gas storehouse through mixing tube respectively, and mix with flue gas to be processed, mixed ammonia
The first catalytic reactor and the second catalytic reactor can successively be entered with flue gas, and then generate chemical reaction, nitrogen oxides is just
It is removed, and is excluded from exhaust pipe.
According to the hysteresis quality of the difference and system itself of the value of setting NOx and the reduced value of exhaust pipe NOx, adjustment spray
Ammonia amount the specific steps are：First choice needs to set the value of NOx in an exhaust, makes emission of smoke tallies environmental requirement, using out
Mouth CEMS analysis meter, measures the actual value of NOx in the flue gas of emission by exhaust pipe, according to the value of setting NOx with exhaust pipe NOx's
The difference of reduced value, makes first a certain amount of for ammonia pitch advancement for ammonia pitch and second, and the number of this magnitude can root
It is obtained for ammonia pitch, second for the valve characteristic of ammonia pitch according to test resulting first.
In addition, according to processing pipe nozzle NOx fluctuation and load variation, adjust ammonia spraying amount the specific steps are：Benefit
With entrance CEMS analysis meter, the variable quantities of two processing pipe nozzle NOx are measured respectively, according to the variable quantity of NOx, make the
One is a certain amount of for ammonia pitch advancement for ammonia pitch and second, this magnitude number can according to test it is resulting first supply
Ammonia pitch, second obtain for the valve characteristic of ammonia pitch, it is contemplated that entrance CEMS analysis meter needs regular purge, when side
When entrance CEMS analysis meter purges, it is switched to what the coefficient that the ratio between two sides NOx value calculates was obtained multiplied by another side entrance NOx value
Magnitude, to make first to measure load with deduction and exemption since purging bring influences for ammonia pitch advancement for ammonia pitch, second
Variable quantity, and made by the variable quantity of load first a certain amount of for ammonia pitch advancement for ammonia pitch, second, equally should
Magnitude number can be obtained for ammonia pitch, second for the valve characteristic of ammonia pitch according to test resulting first.
Finally, according to the actual situation, to automatic control system optimize the specific steps are：Consider shadow when mill switching
It rings, the feedforward of E, F mill run signal is added, that is, 1.5 aperture amount, balance mill start and stop can be provided before running this two mills manually
Seriously affected caused by entrance NOx amount, according to the actual situation, for prevent first for ammonia pitch, second for ammonia pitch toning,
Ensure that denitration efficiency carries out the limitation of 35 lower limit 10 of the upper limit in the pid parameter of the system to PID output order again simultaneously, it is right
Automatic command general export has also carried out the limitation of 45 lower limit 10 of the upper limit.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (10)
1. a kind of denitration autocontrol method, which is characterized in that include the following steps:
Step 100 sets several feed-forward signals according to system disturbance；
Step 200 adjusts ammonia spraying amount according to the value of setting NOx and the difference and feed-forward signal of the reduced value of exhaust pipe NOx.
2. a kind of denitration autocontrol method according to claim 1, which is characterized in that system disturbance includes SCR system
Hysteresis quality, the fluctuation of denitration entrance NOx, the load variations of SCR system, the SCR system of itself grind influence when switching.
3. a kind of denitration autocontrol method according to claim 2, which is characterized in that
According to the hysteresis quality of SCR system itself set the specific method of feed-forward signal as：Define exhaust pipe NOx reduced value with set
The difference for determining NOx value is first via feed-forward signal, and the size of the difference is determined by the characteristic that test obtains valve；
According to the fluctuation of denitration entrance NOx set the specific method of feed-forward signal as：When entrance NOx analyzer does not purge, directly
It connects and defines entrance NOx variable quantity as the second road feed-forward signal；When entrance NOx analyzer purging, it is first determined entrance two sides
The measured value of NOx, then defining the ratio of entrance two sides NOx measured value multiplied by the measured value of other side entrance NOx is second
Road feed-forward signal；
According to the load variations of SCR system set the specific method of feed-forward signal as：Defining load variations amount first is third road
Feed-forward signal.
4. a kind of denitration autocontrol method according to claim 2, which is characterized in that when grinding switching according to SCR system
Influence set the specific method of feed-forward signal as：1.5 aperture amount is provided, manually before running or cutting for balancing
Mill start and stop are influenced caused by entrance NOx amount.
5. a kind of denitration autocontrol method according to claim 1, which is characterized in that in the pid parameter of the system
The limitation that 35 lower limit 10 of the upper limit has been carried out to PID output order has also carried out 45 lower limit 10 of the upper limit to automatic command general export
Limitation.
6. a kind of denitration device, including gas transmission mechanism (1) and SCR reactor (2), it is characterised in that：Gas transmission mechanism (1) packet
Two evaporators (101) are included, and the side of evaporator (101) is respectively arranged with the first liquefied ammonia storage tank (102) and the second liquefied ammonia
Storage tank (103), the first liquefied ammonia storage tank (102) and the second liquefied ammonia storage tank (103) by ammonia inlet pipe (104) with
Corresponding evaporator (101) connection, and ammonia inlet pipe (104) and the first liquefied ammonia storage tank (102), the second liquefied ammonia storage tank
(103) junction is separately installed with first for ammonia pitch (105) and second for ammonia pitch (106)；
The side of the evaporator (101) passes through evaporation tube (107) and is connected with mixer (108), and on evaporation tube (107)
It is equipped with the first solenoid valve (109), the side of the mixer (108) is respectively connected with air inlet lines (110), and in air inlet lines
(110) second solenoid valve (111) are installed with the junction of mixer (108).
7. a kind of denitration device according to claim 6, it is characterised in that：The mixer (108) relative to air into
The other side of pipe (110) passes through mixing tube (112) and is connected with flue gas storehouse (113), and is equipped with third on mixing tube (112)
The side of solenoid valve (114), the flue gas storehouse (113) is respectively connected with fume pipe (115), and is set in the nozzle of fume pipe (115)
It is equipped with the 4th solenoid valve (116).
8. a kind of denitration device according to claim 7, it is characterised in that：The flue gas storehouse (113) is relative to mixing tube
(112) the other side passes through processing pipe (117) and connect with SCR reactor (2), and handles pipe (117) and flue gas storehouse (113)
Junction is mounted on the 5th solenoid valve (118), and the nozzle of the processing pipe (117) is provided with entrance CEMS analysis meter
(119)。
9. a kind of denitration device according to claim 8, it is characterised in that：The SCR reactor (2) include with two at
The first catalytic reactor (201) of reason pipe (117) connection, and the side of the first catalytic reactor (201) passes through catalysing tube (202)
It is connected with the second catalytic reactor (203), the 6th solenoid valve (204) is installed on the catalysing tube (202).
10. a kind of denitration device according to claim 9, it is characterised in that：The side of second catalytic reactor (203)
Side is connected with exhaust pipe (205), and the junction of exhaust pipe (205) and the second catalytic reactor (203) is provided with the 7th electricity
Magnet valve (206), the nozzle of the exhaust pipe (205) are equipped with outlet CEMS analysis meter (207).
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