CN203613020U - Airblasting and airing process real time control device for sewage treatment plant - Google Patents
Airblasting and airing process real time control device for sewage treatment plant Download PDFInfo
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- CN203613020U CN203613020U CN201320839547.1U CN201320839547U CN203613020U CN 203613020 U CN203613020 U CN 203613020U CN 201320839547 U CN201320839547 U CN 201320839547U CN 203613020 U CN203613020 U CN 203613020U
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000010865 sewage Substances 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000001301 oxygen Substances 0.000 claims abstract description 84
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 84
- 239000007789 gas Substances 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000012545 processing Methods 0.000 claims abstract description 27
- 238000005273 aeration Methods 0.000 claims description 50
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 43
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 19
- 238000012546 transfer Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000011217 control strategy Methods 0.000 description 14
- 230000001105 regulatory effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000009514 concussion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004886 process control Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/33—Wastewater or sewage treatment systems using renewable energies using wind energy
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Abstract
The utility model relates to an airblasting and airing process real time control device for a sewage treatment plant, which comprises a biologic treatment unit, wherein an inlet water amount and quality meter is arranged on an inlet pipeline of the biologic treatment unit; the online detected information on inlet water amount Q and the inlet water quality of the biologic treatment unit is transmitted to a comprehensive controller; a dissolved oxygen meter and a gas flowmeter transmit acquired information about dissolved oxygen DO, and gas flow information in a main airing pipe and a branch pipe to the comprehensive controller; an outlet water quality meter arranged on the outlet pipeline of the biologic processing unit also transmits water outlet quality information detected in an on line manner to the comprehensive controller; the comprehensive controller performs feedforward-feedback comprehensive regulation according to the received information and then outputs a control signal to control the work of an air blower and an electromotive valve. The airblasting and airing real time control device for the sewage treatment plant can be widely applied in the technical field of sewage treatment.
Description
Technical field
The utility model relates to the control device in a kind of urban sewage treatment technology field, particularly about a kind of sewage work's blast aeration process real-time control apparatus in biochemical treatment process.
Background technology
Aerating system is the core of whole sewage treatment process, and aerating system energy consumption used accounts for 50～70% of whole sewage work total electricity consumption, is the sewage work maximum unit that consumes energy.Improve the efficiency of sewage work's aerating system, realize the energy-saving and cost-reducing operation of the optimization to the sewage work important in inhibiting of aerating system.At present, the level of control of domestic sewage work aerating system is generally lower, has following problem: up to standard in order to guarantee water outlet, operations staff maintains higher dissolved oxygen (Dissolved Oxygen, DO) concentration, causes the waste of aeration energy consumption; The existing instrument of sewage work and aerator are not supported automatic control; Most Sewage Plant still adopt manual operation air-blast system, and human factor is large to the control effect of aeration rate; Minority sewage work adopts one-parameter feedback control, and dissolved oxygen fluctuation is large, and anti-load impact ability is poor, causes effluent quality unstable.If the response situation of energy composite water quality, microorganism etc. is optimized control to aerating system, can reduce the energy consumption of aerating system, and maintain suitable dissolved oxygen concentration, realize energy-saving and cost-reducing and steady running.
The main core concept of existing sewage work aeration process control techniques is that control algolithm is all generally proportional integral (PI) algorithm of single-input single-output (SISO) by detecting the dissolved oxygen concentration in aeration tank, aeration air quantity being carried out to feedback control.In addition, according to the condition demand after process optimization, adopt the model algorithms of many single outputs of input (MISO) of multiparameter or many conditions, can improve Controlling System and realize the specific aim of certain process function.Utilize in addition the control method of wind energy and luminous energy driving aeration, but larger with the aeration process control difference of sewage work.Hence one can see that, also there is following deficiency in the aeration process control techniques of sewage work at present: when (1) adopts simple single-stage feedback, lack intermediate variable, control loop is not distinguished oxygenation process fast and oxygen process at a slow speed, therefore be difficult to reach the stable effect of controlling, in actual application, often occur the situation of hyperharmonic concussion.(2) while adopting fairly simple tandem feedback, lack feedforward compensation, be difficult to tackle influent load fast and situation about fluctuating widely, cause dissolved oxygen control effect not good enough.(3) while having adopted the expert systems of more complicated or Intelligent Control Strategy, very high to the requirement of Model Identification and parameter calibration, control effect unstable or do not checked by Practical Project, be difficult to apply in Practical Project.
Summary of the invention
For the problems referred to above, the purpose of this utility model is to provide a kind of sewage work blast aeration process real-time control apparatus, and it can realize the feed-forward and feedback comprehensive adjustment of blast aeration system, the dissolved oxygen concentration in stabilate reaction tank.
For achieving the above object, the utility model is taked following technical scheme: a kind of sewage work blast aeration process real-time control apparatus, is characterized in that: it comprises biological processing unit, amount of inlet water water quality meter, ICU, effluent quality instrument, gas blower and electrically operated valve; In described biological processing unit, be also provided with dissolved oxygen instrument and some gas meters, each described gas meter is separately positioned on the aeration main and arm in described biological processing unit; On the entrance pipe of described biological processing unit, be provided with described amount of inlet water water quality meter, described amount of inlet water water quality meter by the flooding quantity Q of the described biological processing unit detecting online and influent quality information transmission to described ICU; Described dissolved oxygen instrument and gas meter all transfer to gas flow DQ value in the dissolved oxygen DO value, aeration main and the arm that collect in described ICU; The described effluent quality instrument being arranged on described biological processing unit export pipeline also transfers to the effluent quality information detecting online in described ICU; Described ICU carries out exporting control signal after feed-forward and feedback comprehensive adjustment according to the information receiving, and controls described gas blower, electrically operated valve work.
Described ICU comprises feedforward compensation module, feedback compensation module, tandem feedback control module and pid control module; Described feedforward compensation module, by gas flow DQ value in the flooding quantity Q of the amount of inlet water water quality meter collecting and influent quality information and dissolved oxygen DO value, aeration main and arm, transfers in described tandem feedback control module; Described feedback compensation module by the effluent quality information transmission of the effluent quality instrument collecting in described tandem feedback control module; Described tandem feedback control module compensates dissolved oxygen DO value according to all information receiving, calculate the set(ting)value of air demand according to the difference of dissolved oxygen set(ting)value and measured value after compensation, then air demand set(ting)value is compensated according to reception information by described tandem feedback control module, and the air demand set(ting)value after compensation is transferred in described pid control module and processed, export control signal by described pid control module to described gas blower, electrically operated valve.
Described amount of inlet water water quality meter comprises amount of inlet water instrument, influent quality instrument, COD on-line detector and ammonia nitrogen on-line detector.
Described COD instrument adopts optical method COD on-line detector, and described amount of inlet water instrument adopts magnetic flow meter, and described ammonia nitrogen on-line detector adopts the online ammonia nitrogen instrument of ion selective electrode method.
Described effluent quality instrument is ammonia nitrogen on-line detector, and described ammonia nitrogen on-line detector adopts the online ammonia nitrogen instrument of ion selective electrode method.
The utility model is owing to taking above technical scheme, it has the following advantages: 1, the utility model suppresses the disturbance by a small margin of aeration process by dissolved oxygen tandem feedback control, weaken by feedforward compensation the impact that influent load fluctuates widely, improve the reliability of effluent quality by feedback compensation.2, the utility model, according to instrument arrangement situation and signal quality, can switch control strategy automatically.When all instrument is normally worked, the control strategy of complete.When certain part instrument fault, can use the control strategy of part, still can reach good control effect.3, the utility model, in order to overcome the problem of dissolved oxygen hyperharmonic concussion, adopts tandem control to feedback element, separates fast and loop at a slow speed, can in certain fluctuation range, realize stable control.4, the utility model is difficult in order to overcome tandem control the problem that inhibition is fluctuated widely, and adopts the multistage feedforward compensation of influent load and the water yield, overcomes the impact that influent load or gas flow fluctuate widely on biochemistry pool dissolved oxygen.5, the utility model has been simplified control strategy and matching requirements, meets the software and hardware basic condition of most of sewage work, can be fast and Standardization Practice; Reserve the interface of senior control simultaneously, can expand Premium Features.The utility model can be widely used in technical field of sewage.
Accompanying drawing explanation
Fig. 1 is device one-piece construction schematic diagram of the present utility model, in figure
represent sewage treatment process,
represent control signal;
represent instrument sampling process;
Fig. 2 is method overall flow schematic diagram of the present utility model;
Fig. 3 is the utility model feed-forward and feedback ICU policy selection schematic diagram.
Embodiment
The sewage treatment process aeration mode that the utility model relates to is mainly blast aeration system.Aeration process refers to as meeting the demand of biochemical reaction for dissolved oxygen, carries the process of air by gas blower to biological processing unit.Aeration process is one of most important link of sewage work, directly affects the quality of wastewater treatment efficiency.If the aeration rate of biological tank is inadequate, nitration reaction can not be carried out completely; If aeration rate is excessive, the dissolved oxygen in water will suppress denitrifying by phegma to carry out, and causes denitrification effect undesirable.Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, the utility model provides a kind of sewage work blast aeration process real-time control apparatus, and it comprises biological processing unit 1, amount of inlet water water quality meter 2, ICU 3, effluent quality instrument 4, gas blower 5 and electrically operated valve 6.Wherein, be also provided with dissolved oxygen instrument 7 and some gas meters 8 in biological processing unit 1, each gas meter 8 is separately positioned on the aeration main and arm in biological processing unit 1.
On the entrance pipe of biological processing unit 1, be provided with amount of inlet water water quality meter 2, amount of inlet water water quality meter 2 by the flooding quantity Q of the biological processing unit detecting online 1 and influent quality information transmission to ICU 3.The dissolved oxygen instrument 7 of biological processing unit 1 interior setting and gas meter 8 all transfer to gas flow DQ value in the dissolved oxygen DO value, aeration main and the arm that collect in ICU 3.Meanwhile, the effluent quality instrument 4 being arranged on biological processing unit 1 export pipeline also transfers to the effluent quality information detecting online in ICU 3.ICU 3 carries out exporting control signal after feed-forward and feedback comprehensive adjustment according to the information receiving, and control gas blower 5, electrically operated valve 6 are worked, and complete the real-time control to sewage work's blast aeration amount.Wherein, influent quality information comprises COD(oxygen requirement) and the concentration of ammonia nitrogen, effluent quality information comprises the concentration of ammonia nitrogen.
In above-described embodiment, ICU 3 comprises feedforward compensation module 9, tandem feedback control module 10, feedback compensation module 11 and pid control module 12.Feedforward compensation module 9 is for gathering gas flow DQ value in the flooding quantity Q of amount of inlet water water quality meter 2 and influent quality information and dissolved oxygen DO value, aeration main and arm, and transfers in tandem feedback control module 10; Feedforward compensation module 9 will flooding quantity Q, influent quality, dissolved oxygen DO value and gas flow DQ value compare with predefined threshold value after calculating, and to the feedforward compensation regulated quantity of tandem feedback control module 10 interior input dissolved oxygen set(ting)value or air demand set(ting)value.Feedback compensation module 11 is for gathering the effluent quality information of effluent quality instrument 4, and transfers in tandem feedback control module 10; Feedback compensation module 11 compares effluent quality information and predefined emission standard, calculates the safety allowance of water outlet ammonia nitrogen, and to the feedback compensation regulated quantity of tandem feedback control module 10 interior input dissolved oxygen set(ting)value or air demand set(ting)value.Tandem feedback control module 10 compensates dissolved oxygen DO value according to all information receiving, calculate the set(ting)value of air demand according to the difference of dissolved oxygen set(ting)value and measured value after compensation, then air demand set(ting)value is compensated according to reception information by tandem feedback control module 10, and the air demand set(ting)value after compensation is transferred to the interior processing of pid control module 12, export control signal by pid control module 12 to gas blower 5, electrically operated valve 6.
In the various embodiments described above, amount of inlet water water quality meter 2 comprises amount of inlet water instrument, influent quality instrument, COD on-line detector and ammonia nitrogen on-line detector, wherein COD instrument can adopt optical method COD on-line detector, and amount of inlet water instrument can adopt magnetic flow meter.
In the various embodiments described above, effluent quality instrument 4 is ammonia nitrogen on-line detector.Ammonia nitrogen on-line detector in ammonia nitrogen on-line detector and effluent quality instrument 4 in amount of inlet water water quality meter 2 can adopt the online ammonia nitrogen instrument of ion selective electrode method.
As shown in Figure 2, based on sewage work's blast aeration process real-time control apparatus, sewage work of the present utility model blast aeration process real-time control method comprises the following steps:
1) concentration of the water inlet chemical oxygen demand COD collecting, ammonia nitrogen and flooding quantity Q are carried out influent load calculating by feedforward compensation module 9, calculation result is carried out quality of data discriminatory analysis, in default optimum dissolved oxygen data form, search the dissolved oxygen set(ting)value needing according to calculation result, to export dissolved oxygen feedforward compensation regulated quantity Δ DO to tandem feedback control module 10
iN(t); In the time that dissolved oxygen set(ting)value feedforward compensation link is cancelled, export Δ DO
iN(t)=0.
Wherein, amount of inlet water water quality meter 2 gathers influent quality signal, together with reaction tank volume in biological processing unit 1, calculates water inlet chemical oxygen demand COD load L with flooding quantity Q
cODand influent ammonia nitrogen loading
In formula, COD is water inlet chemical oxygen demand (COD), and unit is kg/m
3; NH
3n is the concentration of ammonia nitrogen, and unit is kg/m
3, Q
iNFfor flooding velocity, unit is m
3/ d; V is the volume of biochemistry pool, and unit is m
3.
Suppose that current given dissolved oxygen set(ting)value is DO
st(t), according to water temperature T, water inlet chemical oxygen demand COD load L
cOD, influent ammonia nitrogen loading
in default optimum dissolved oxygen data form, check in the optimal dissolution oxygen DO set(ting)value DO needing
iN(t), calculate dissolved oxygen feedforward compensation regulated quantity Δ DO
iN(t):
ΔDO
IN(t)＝DO
IN(t)-DO
st(t) (2)
2) the flooding quantity Q collecting and aeration main gas flow DQ value are carried out computing by feedforward compensation module 9, calculates instantaneous gas-water ratio; Instantaneous gas-water ratio is carried out to quality of data discriminatory analysis, if when result of determination does not exceed preset range, maintain current state constant; If result of determination, for occurring flow when sudden change, starts feedforward compensation module 9, regulate the air demand set(ting)value of tandem feedback control module 10, change real gas flow, keep instantaneous gas-water ratio basicly stable.
Its detailed process is as follows:
Suppose that in t moment control cycle, flooding quantity Q arithmetical av is Q
iN(t), aeration main gas flow DQ arithmetical av is DQ (t), and the rangeability y of instantaneous gas-water ratio x is calculated as follows:
x(t)＝DQ(t)/Q
IN(t)，
y(t)＝[x(t)-x(t-1)]/x(t-1)×100%。(3)
The safety range a%(that exceedes setting as gas-water ratio rangeability y for example 20%, but be not limited to this, can determine according to actual needs) time, carry out the feedforward compensation of air demand set(ting)value.Now calculate air demand set(ting)value Δ DQ according to gas-water ratio rangeability y
iN, and send to pid control module 12.Air demand setting compensation value Δ DQ
iNcalculation formula as follows:
In formula, | y| is the absolute value of rangeability y, and DQ (t-1) refers to the gas flow of a control cycle (t-1) moment aeration main, and a% is the safe variation range of setting.
3) tandem feedback control module 10 is by dissolved oxygen concentration and the preset value comparison of the biological processing unit 1 interior reaction tank of actual measurement, and adoption rate-integration (Proportional and Integration, PI) algorithm calculates the setting of air demand; Simultaneously, according to gas flow and the air demand set(ting)value of the biological processing unit 1 interior reaction tank of actual measurement, adopt PI algorithm to calculate gas blower 5, the required valve opening of electrically operated valve 6 and gas blower 5 Flow-rate adjustment degree, output to pid control module 12, realize valve opening, gas blower 5 flow controls to gas blower 5, electrically operated valve 6.
Its detailed process is as follows:
Control process adopts tandem feedback algorithm, relatively the currency DO (t) of dissolved oxygen concentration and set(ting)value DO
st(t) the difference DELTA DO between
sT(t), calculation formula is:
ΔDO
ST(t)＝DO
st(t)-DO(t) (5)
Then calculate the adjustable value Δ DO (t) of dissolved oxygen:
ΔDO(t)＝ΔDO
ST(t)+ΔDO
IN(t)+ΔDO
EF(t) (6)
Wherein Δ DO
iN(t) be the dissolved oxygen setting feedforward compensation value based on influent load, Δ DO
eF(t) be the dissolved oxygen feedback compensation adjustable value based on effluent quality, when initialize by manually specifying DO
stor get default value (t).
The dissolved oxygen adjustable value Δ DO (t) calculating according to above formula, uses PI algorithm to calculate the regulated quantity Δ DQ of current air demand
sT(t):
ΔDQ
ST(t)＝K
1ΔDO(t)+K
2ΔDO(t-1) （7）
Then calculate the adjustable value Δ DQ (t) of air demand:
ΔDQ(t)＝ΔDQ
ST(t)+ΔDQ
IN(t)+ΔDQ
EF(t) （8）
In formula, Δ DO (t-1) refers to the difference of a control cycle (t-1) moment dissolved oxygen concentration value and preset value; K
1and K
2be coefficient, can debug by experiment definite; Δ DQ
iN(t) be the Front Feed Compensation of the air demand set(ting)value based on amount of inlet water; Δ DQ
eF(t) be the regulated quantity of the air demand set point feedback compensation based on effluent quality.
The air demand adjustable value Δ DQ (t) calculating according to above formula, uses PI algorithm to calculate the regulated quantity Δ DV (t) of valve opening or gas blower 5 flows, and outputs to pid control module 12.Wherein regulated quantity Δ DV (t) is:
ΔDV(t)＝K
3ΔDQ(t)+K
4ΔDQ(t-1) （9）
In formula, Δ DQ (t-1) refers to the regulated quantity of a control cycle (t-1) moment air demand; K
3and K
4be coefficient, can debug by experiment definite; When initialize Δ DV (t) by artificial given or get default value.
4) feedback compensation module 11 is calculated the effluent quality signal collecting and predefined emission standard, obtains the safety allowance of water outlet ammonia nitrogen.According to the size of water outlet ammonia nitrogen safety allowance, dissolved oxygen set(ting)value in tandem feedback control module 10 or air demand set(ting)value are compensated.
Its detailed process is as follows:
The ammonia nitrogen concentration of supposing effluent quality is T (t), and Effluent criteria is T
sT, safety allowance ST is:
ST＝T
ST-T(t)＞0 （10）
According to the quality of data discriminatory analysis in feedback compensation module 11, water outlet ammonia nitrogen safety allowance to be judged, result of determination is during compared with low risk, maintains current state constant; When result of determination is average risk, start feedback compensation module 11, change the dissolved oxygen set(ting)value in tandem feedback module 13, slowly increase safety allowance; When result of determination is high risk, start feedback compensation module 11, change the gas flow set(ting)value in tandem feedback module 13, safety allowance increases sharply.
The safety allowance set(ting)value of supposing average risk is b, and the safety allowance set(ting)value of high risk is c, has b > c.Press PI algorithm and calculate the dissolved oxygen set(ting)value Δ DO based on effluent quality feedback compensation
eFand air demand Δ DQ (t)
eF(t):
In formula, DO
sT(t-1) and DQ (t-1) refer to dissolved oxygen set(ting)value and the air demand set(ting)value of a control cycle (t-1) moment biological processing unit 1; K
5and K
6for coefficient, can determine by debugging.
As shown in Figure 3, sewage work of the present utility model blast aeration process real-time control method, according to instrument arrangement situation and signal quality, can switch control strategy automatically.In the time that amount of inlet water water quality meter 2, effluent quality instrument 4, dissolved oxygen instrument 7, gas meter 8 are all normally worked, execution step 1) to the complete feedforward/feedback-dissolved oxygen tandem feedback control strategy of step 4); In the time of influent quality instrument fault, cancellation step 1) middle dissolved oxygen setting feedforward compensation, all the other control strategies are proceeded to control; In the time of amount of inlet water instrument fault, cancel whole feedforward compensation modules 9, all the other control strategies are normally controlled; In the time of effluent quality instrument 4 fault, cancel whole feedback compensation modules 11, all the other control strategies are proceeded to control; In the time of dissolved oxygen instrument 7 fault, cancel dissolved oxygen tandem feedback control module 10, make gas consumption setup control strategy; In the time of gas meter 8 fault, cancel whole control strategies, adopt predefined valve opening.
As an example of the blast aeration system of certain sewage work example, control method of the present utility model is described in further detail below.
Embodiment: the blast aeration Controlling System of certain sewage work
Process operation situation: AAO technique, 100,000 tons/day of scales, point two series, each series has 5 aeration control subregions.Water-in has been arranged optical method COD on-line detector, the online ammonia nitrogen instrument of ion selective electrode method, magnetic flow meter etc.Each series has been arranged 3 dissolved oxygen instruments, 1 sludge concentration meter, 5 electrically operated valves and 5 thermal gas flowmeters.Water outlet has been arranged the online COD instrument of chemical method and the online ammonia nitrogen instrument of colorimetry.Blast apparatus is single-stage high-speed centrifugal blower, realizes the Long-distance Control of air quantity with master control cabinet.ICU 3 is realized whole algorithms of feed-forward and feedback compensation, tandem feedback control.
Control strategy performance: ICU 3 gathers amount of inlet water, water quality data.Initialize biochemistry pool dissolved oxygen set(ting)value is 2.0mg/L.Draw dissolved oxygen setting feedforward compensation value Δ DO according to formula (1) and formula (2) computation of table lookup
iN(t),, while being 0.4kg/m3.d and 0.08kg/m3.d as temperature 15-20 degree Celsius, COD and ammonia nitrogen loading, optimum dissolved oxygen set(ting)value is 1.5mg/L, Δ DO
iN(t)=-0.5mg/L.
In the time that the water yield increases suddenly or reduces, feedforward compensation module 9 starts, and ICU 3 calculates air demand setting feedforward compensation value Δ DQ according to formula (3) and formula (4)
iN(t).As a% gets 30%, current aeration rate 8000m3/hr, now establishes newly after an intake pump, after flow increases by 50%, calculates Δ DQ
iN(t)=4000m3/hr.In the time that flooding velocity rangeability is less than 30%, output Δ DQ
iN(t)=0.
In the time that water outlet ammonia nitrogen concentration raises, ICU is judged safety allowance, K according to formula (10) and (11)
5and K
6initial value is 1, and debugging value is 1.5 and 0.5.Ammonia nitrogen emission standard is 5mg/L, and average risk safety allowance is 4mg/L, and high risk safety allowance is 2mg/L.As water outlet ammonia nitrogen reaches 1.5mg/L, dissolved oxygen set(ting)value is 1.5mg/L; Now water outlet ammonia nitrogen safety allowance is 3.5mg/L<4mg/L, starts the compensation of dissolved oxygen set point feedback, calculates dissolved oxygen set(ting)value compensation rate Δ DO by formula (11)
eF(t)=1.2mg/L, air demand set(ting)value compensation rate Δ DQ
eF(t)=0.If water outlet ammonia nitrogen reaches 3.5mg/L, aeration rate is 8000m3/h, and now water outlet ammonia nitrogen safety allowance is 1.5mg/L, starts the compensation of air demand set point feedback, calculates Δ DO by formula (11)
eF(t)=0, Δ DQ
eF(t)=2900m
3/ h.
Dissolved oxygen tandem is feedback controlled to continuous running status, calculates valve and gas blower 5 adjustable value Δ DV by formula (5) to formula (9).Artificial given dissolved oxygen set(ting)value DO
sT=2mg/L, artificial given air demand set(ting)value DO
sT=8000m
3/ h, as the initial value of controlling unit.Parameter K
1and K
3position initial value is 1, and debugging value is 1.2; Parameter K
2and K
4initial value is-1, and debugging value is-0.5.
In the time that instrument breaks down, automatic switchover control strategy.As influent COD and the maintenance of ammonia nitrogen instrument, now cancel dissolved oxygen and set feedforward compensation, Δ DO
iN(t)=0, other links are constant.In the time that water outlet ammonia nitrogen instrument is safeguarded, cancel feedback compensation, Δ DO
eF(t)=Δ DQ
eF(t)=0, other links are constant.In the time that dissolved oxygen instrument breaks down or keep in repair, now cancel dissolved oxygen tandem feedback control, Δ DQ
sT(t)=0, other links are constant.
Above-mentioned Controlling System can, in steady running under various working, be controlled at set(ting)value 0.5mg/L by dissolved oxygen upper and lower.Such as, when set(ting)value is 2.5mg/L, fluctuating range ± 20%, fluctuation range 2～3mg/L; When set(ting)value 1.5mg/L, fluctuating range 35%, fluctuation range 0.9～2.0mg/L.
By the operation of continuous 1 year, the result obtaining was water outlet COD and ammonia nitrogen stably reaching standard, and consumption reduction successful, and gas blower 5 aeration energy consumption reduce by 10%.
In sum, the utility model in use, biological processing unit 1, amount of inlet water water quality meter 2, effluent quality instrument 4, dissolved oxygen instrument 7, gas meter 8, tandem feedback control module 10 are in real-time continuous running status, continuous acquisition signal is also adjusted gas flow, realizes dissolved oxygen tandem feedback control; Feedforward compensation module 9 and feedback compensation module 11, in Event triggered state, start compensating module while there is default situation, and the control set(ting)value of tandem feedback control module 10 is compensated, and realize the Multilevel compensating control based on feed-forward and feedback.The utility model compensates by multistage feed-forward and feedback, can effectively distinguish the interference that the water yield changes fast and the slow variation of load brings, and improve system reliability of operation.This know-why is simple, clear in structure, technology popularization are strong, can carry out combination with the existing Controlling System of sewage work, reach following effect: 1, adopt the dissolved oxygen tandem control of multiple spot compensation, can realize by a small margin stable control disturbance in the situation that at aeration process, overcome the problem of dissolved oxygen hyperharmonic concussion.2, the feedforward compensation that adopts influent load and amount of inlet water, can effectively overcome the impact that influent load or gas flow fluctuate widely on dissolved oxygen, can comparatively fast stabilize the dissolved oxygen fluctuation that significantly disturbance brings.3, adopt the feedback compensation of effluent quality, can further improve the effect of tandem feedback control, thereby improve the security of process operation.
The various embodiments described above are only for illustrating the utility model; the structure of each parts and mode of connection all can change to some extent; on the basis of technical solutions of the utility model; all improvement and equivalents that according to the utility model principle, the connection to indivedual parts and structure are carried out, all should not get rid of outside protection domain of the present utility model.
Claims (6)
1. sewage work's blast aeration process real-time control apparatus, is characterized in that: it comprises biological processing unit, amount of inlet water water quality meter, ICU, effluent quality instrument, gas blower and electrically operated valve; In described biological processing unit, be also provided with dissolved oxygen instrument and some gas meters, each described gas meter is separately positioned on the aeration main and arm in described biological processing unit;
On the entrance pipe of described biological processing unit, be provided with described amount of inlet water water quality meter, described amount of inlet water water quality meter by the flooding quantity Q of the described biological processing unit detecting online and influent quality information transmission to described ICU; Described dissolved oxygen instrument and gas meter all transfer to gas flow DQ value in the dissolved oxygen DO value, aeration main and the arm that collect in described ICU; The described effluent quality instrument being arranged on described biological processing unit export pipeline also transfers to the effluent quality information detecting online in described ICU; Described ICU carries out exporting control signal after feed-forward and feedback comprehensive adjustment according to the information receiving, and controls described gas blower, electrically operated valve work.
2. a kind of sewage work as claimed in claim 1 blast aeration process real-time control apparatus, is characterized in that: described ICU comprises feedforward compensation module, feedback compensation module, tandem feedback control module and pid control module; Described feedforward compensation module, by gas flow DQ value in the flooding quantity Q of the amount of inlet water water quality meter collecting and influent quality information and dissolved oxygen DO value, aeration main and arm, transfers in described tandem feedback control module; Described feedback compensation module by the effluent quality information transmission of the effluent quality instrument collecting in described tandem feedback control module; Described tandem feedback control module compensates dissolved oxygen DO value according to all information receiving, calculate the set(ting)value of air demand according to the difference of dissolved oxygen set(ting)value and measured value after compensation, then air demand set(ting)value is compensated according to reception information by described tandem feedback control module, and the air demand set(ting)value after compensation is transferred in described pid control module and processed, export control signal by described pid control module to described gas blower, electrically operated valve.
3. a kind of sewage work as claimed in claim 1 or 2 blast aeration process real-time control apparatus, is characterized in that: described amount of inlet water water quality meter comprises amount of inlet water instrument, influent quality instrument, COD on-line detector and ammonia nitrogen on-line detector.
4. a kind of sewage work as claimed in claim 3 blast aeration process real-time control apparatus, it is characterized in that: described COD instrument adopts optical method COD on-line detector, described amount of inlet water instrument adopts magnetic flow meter, and described ammonia nitrogen on-line detector adopts the online ammonia nitrogen instrument of ion selective electrode method.
5. a kind of sewage work blast aeration process real-time control apparatus as described in claim 1 or 2 or 4, is characterized in that: described effluent quality instrument is ammonia nitrogen on-line detector, and described ammonia nitrogen on-line detector adopts the online ammonia nitrogen instrument of ion selective electrode method.
6. a kind of sewage work as claimed in claim 3 blast aeration process real-time control apparatus, is characterized in that: described effluent quality instrument is ammonia nitrogen on-line detector, and described ammonia nitrogen on-line detector adopts the online ammonia nitrogen instrument of ion selective electrode method.
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| CN201320839547.1U CN203613020U (en) | 2013-12-18 | 2013-12-18 | Airblasting and airing process real time control device for sewage treatment plant |
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| CN201320839547.1U CN203613020U (en) | 2013-12-18 | 2013-12-18 | Airblasting and airing process real time control device for sewage treatment plant |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103663674A (en) * | 2013-12-18 | 2014-03-26 | 清华大学 | Real-time control device and control method for blast aeration process of sewage treatment plant |
| CN104238586A (en) * | 2014-09-30 | 2014-12-24 | 上海昊沧系统控制技术有限责任公司 | Method and system for ammonia nitrogen control in biological sewage treatment process |
| CN106336001A (en) * | 2016-09-27 | 2017-01-18 | 柳州高新区欧亚自动化设备有限责任公司 | Control system of water pumps and aerators in MC-MBBR process of sewage treatment plant and control method thereof |
| CN106517548A (en) * | 2016-11-21 | 2017-03-22 | 徐州核瑞环保投资有限公司 | Dissolved oxygen control device and system thereof |
| CN109205808A (en) * | 2018-10-11 | 2019-01-15 | 首创爱华(天津)市政环境工程有限公司 | A kind of accurate aeration control method based on water outlet ammonia nitrogen and dissolved oxygen |
| CN110436609A (en) * | 2019-08-01 | 2019-11-12 | 合肥通用机械研究院有限公司 | A kind of Intellectualized sewage water processing aeration control method with self-learning function |
| CN110862141A (en) * | 2019-12-10 | 2020-03-06 | 北京北排科技有限公司 | Dissolved oxygen adaptive control device and method thereof |
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- 2013-12-18 CN CN201320839547.1U patent/CN203613020U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103663674A (en) * | 2013-12-18 | 2014-03-26 | 清华大学 | Real-time control device and control method for blast aeration process of sewage treatment plant |
| CN103663674B (en) * | 2013-12-18 | 2015-05-20 | 清华大学 | Control method of real-time control device for blast aeration process of sewage treatment plant |
| CN104238586A (en) * | 2014-09-30 | 2014-12-24 | 上海昊沧系统控制技术有限责任公司 | Method and system for ammonia nitrogen control in biological sewage treatment process |
| CN106336001A (en) * | 2016-09-27 | 2017-01-18 | 柳州高新区欧亚自动化设备有限责任公司 | Control system of water pumps and aerators in MC-MBBR process of sewage treatment plant and control method thereof |
| CN106336001B (en) * | 2016-09-27 | 2019-07-09 | 柳州高新区欧亚自动化设备有限责任公司 | The control system and its control method of sewage treatment plant MC-MBBR technique water pump and aerator |
| CN106517548A (en) * | 2016-11-21 | 2017-03-22 | 徐州核瑞环保投资有限公司 | Dissolved oxygen control device and system thereof |
| CN109205808A (en) * | 2018-10-11 | 2019-01-15 | 首创爱华(天津)市政环境工程有限公司 | A kind of accurate aeration control method based on water outlet ammonia nitrogen and dissolved oxygen |
| CN110436609A (en) * | 2019-08-01 | 2019-11-12 | 合肥通用机械研究院有限公司 | A kind of Intellectualized sewage water processing aeration control method with self-learning function |
| CN110436609B (en) * | 2019-08-01 | 2022-05-31 | 合肥通用机械研究院有限公司 | Intelligent sewage treatment aeration control method with self-learning function |
| CN110862141A (en) * | 2019-12-10 | 2020-03-06 | 北京北排科技有限公司 | Dissolved oxygen adaptive control device and method thereof |
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