CN109814374A - A kind of automatic joint debugging system and its control method of more air blower units - Google Patents
A kind of automatic joint debugging system and its control method of more air blower units Download PDFInfo
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- CN109814374A CN109814374A CN201910091227.4A CN201910091227A CN109814374A CN 109814374 A CN109814374 A CN 109814374A CN 201910091227 A CN201910091227 A CN 201910091227A CN 109814374 A CN109814374 A CN 109814374A
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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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Abstract
The invention discloses the automatic joint debugging systems and its control method of a kind of more air blower units.It includes more air blower units, main control cabinet, dissolved oxygen sensor and oxygen demand the acquisition computing system being connect respectively with the main control cabinet, every air blower unit is provided with the PLC control cabinet on the spot controlled it, PLC control cabinet is connect by optical fiber with the main control cabinet on the spot, the dissolved oxygen sensor is used to measure the oxygen content of sewage, the oxygen demand that the oxygen demand acquisition computing system is used to acquire the various parameters value in sewage and calculate sewage, then the aerobic magnitude of sewage is sent to main control cabinet, the main control cabinet includes PLC controller, pid control algorithm is integrated in PLC controller, the main control cabinet adjusts the oxygen-supplying amount of more air blower units by controlling the oxygen-supplying amount of one air blower unit of PLC control cabinet adjusting on the spot.
Description
Technical field
The invention belongs to air compressor control technical field, be related to a kind of more air blower units automatic joint debugging system and its
Control method.
Background technique
In the technique that current municipal sewage treatment generallys use biological treatment, bottom blast aeration is common aeration side
Formula.Aeration is the most important energy consumption link of sewage plant, accounts for about the 50-80% of total power consumption.Improvement and section with control mode
The development of energy technology, accurate aeration become the importance of sewage plant reducing energy consumption, have significant energy-saving effect.It is so-called accurate
Aeration refers to the actual needs gas supply according to sewage plant biological reaction pool.In this way, on the one hand can guarantee the steady of biological treatment environment
It is fixed；On the other hand, and the aeration quantity in system is made to be unlikely to excessive and cause to waste.
However, general sewage plant has more air blower units, traditional mode is manually to control list on the spot or remotely
The air quantity of the start and stop of platform air blower unit and every air blower is adjusted, and the mode disadvantage of manual control is many, on the one hand must people
Member's twenty four hours is on duty, causes the increase of human cost；On the other hand it will cause the delay significantly of air quantity adjusting and inaccurate,
The energy-efficient effect of accurate aeration is not achieved.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of automatic joint debugging systems of more air blower units
System and its control method.
The object of the present invention is achieved like this: a kind of automatic joint debugging system of more air blower units, which is characterized in that
Including more air blower units, main control cabinet, the respectively dissolved oxygen sensor that is connect with the main control cabinet and oxygen demand acquisition
Computing system, every air blower unit are provided with the PLC control cabinet on the spot controlled it, and PLC control cabinet passes through looped network light on the spot
Fine to connect with the main control cabinet gas, the dissolved oxygen sensor is used to measure the oxygen content of sewage, the oxygen demand acquisition meter
Calculation system is used to acquire the various parameters value in sewage and calculates the oxygen demand of sewage, then transmits the aerobic magnitude of sewage
To main control cabinet, the main control cabinet includes PLC controller, and pid control algorithm, the main control are integrated in PLC controller
Cabinet adjusts the oxygen supply of more air blower units by controlling the oxygen-supplying amount of one air blower unit of PLC control cabinet adjusting on the spot
Amount.
The control method of the automatic joint debugging system of more above-mentioned air blower units, which is characterized in that if the need of sewage
Oxygen amount FO2 is neededMeet with m platform air blower maximum stream flowWherein, m≤N-1, N are
The quantity of air blower unit, main control cabinet sends enabled instruction to the PLC control cabinet on the spot of 1# unit to m# unit, while giving 1#
The flow of 1# unit to (m-1) # unit is adjusted to maximum, then master control to (m-1) # unit transmitted traffic regulating command by unit
Cabinet processed gives m# unit transmitted traffic regulating command, and the flow of m# unit is adjusted to minimum, then starts (m+1) # unit, and by (m
+ 1) flow of # unit is adjusted to minimum, then adjusts the flow of m# unit to maximum, then passes through (m+1) # unit just again
Ground PLC controller carries out PID adjusting, the oxygen demand F until being adjusted to sewageO2 is neededEqual to the oxygen content F of sewageO2 is surveyed, i.e. FO2 is needed=
FO2 is surveyed。
Preferably, as the oxygen content F of sewageO2 is surveyedHigher than the oxygen demand F of sewageO2 is neededWhen, i.e. FO2 is surveyed>FO2 is needed, control cabinet sentences first
Whether disconnected (m+1) # unit is minimum discharge, if (m+1) # unit is minimum discharge, main control cabinet sends halt instruction to (m+
1) PLC controller on the spot of # unit makes it directly close (m+1) # unit；If (m+1) # unit is not minimum discharge, main control
Cabinet sends oxygen supply regulating command to the PLC controller on the spot of (m+1) # unit, and starting this, PLC controller carries out PID adjusting on the spot,
The flow of (m+1) # unit is reduced, until the oxygen content F of sewageO2 is surveyedWith the oxygen demand F of sewageO2 is neededIt is equal, then stop reducing (m
+ 1) flow of # unit；Such as the oxygen content F of sewageO2 is surveyedAlways above the oxygen demand F of sewageO2 is needed, then (m+1) # unit is reduced always
Flow until the flow of (m+1) # unit to its minimum discharge；When such as flow to its minimum discharge of (m+1) # unit, sewage
Oxygen content FO2 is surveyedThe still higher than oxygen demand F of sewageO2 is needed, then (m+1) # unit is closed, whether main control cabinet judges m# unit again
For minimum discharge, if m# unit is minimum discharge, main control cabinet sends halt instruction to the PLC controller on the spot of m# unit, directly
It connects and closes m# unit；If m# unit is not minimum discharge, main control cabinet sends oxygen supply regulating command to the PLC on the spot of m# unit
Controller, start this on the spot PLC controller carry out PID adjusting, reduce m# unit flow, until m# unit flow to it most
It is closed after small flow, then successively judges (m-1) # unit, whether the flow of (m-2) # unit ... 2# unit is minimum discharge.
Preferably, as the oxygen content F of sewageO2 is surveyedLower than the oxygen demand F of sewageO2 is neededWhen, i.e. FO2 is surveyed<FO2 is needed, main control cabinet is first
The flow of 1# unit to m# unit is successively detected, if any the unit for not operating in maximum stream flow, then main control cabinet is sent
The PLC controller on the spot of corresponding unit is given in regulating command, this on the spot PLC controller according to the oxygen content F of sewageO2 is surveyedLower than sewage
Oxygen demand FO2 is neededThe case where carry out PID adjusting, increase the oxygen flow of corresponding unit, if increasing corresponding unit oxygen supply stream
During amount, FO2 is surveyed=FO2 is needed, then stop increasing, oxygen flow to its maximum oxygen supply for otherwise continuing to increase this unit is flowed
Amount, the unit for then proceeding to not operate in maximum stream flow to next in a like fashion carries out PID adjusting, until sewage contains
Oxygen amount FO2 is surveyedEqual to the oxygen demand F of sewageO2 is needed；
After if 1# unit were all adjusted to maximum stream flow to m# unit, the oxygen content F of sewageO2 is surveyedStill lower than sewage
Oxygen demand FO2 is needed, then the PLC controller on the spot for starting (m+1) # unit carries out PID adjusting, increases its oxygen-supplying amount, until FO2 is surveyed=
FO2 is neededStop adjusting afterwards；
If the oxygen flow of (m+1) # unit is adjusted to maximum, the oxygen content F of sewageO2 is surveyedStill it is lower than the oxygen demand of sewage
FO2 is needed, at this point, (m+1) # unit flow is directly adjusted to minimum by PLC controller on the spot by (m+1) # unit, then start (m+
2) # unit, and the oxygen flow of (m+2) # unit is adjusted to minimum, the flow of (m+1) # unit and (m+2) # unit is all located at this time
In minimum discharge, then first adjust (m+1) # unit flow, if in adjustment process sewage oxygen content FO2 is surveyedEqual to the need of sewage
Oxygen amount FO2 is needed, then stop adjusting；If (m+1) # unit is adjusted to maximum oxygen flow, the oxygen content F of sewageO2 is surveyedStill it is lower than sewage
Oxygen demand FO2 is needed, then the PLC controller on the spot for starting (m+2) # unit carries out PID adjusting, if sewage is oxygen-containing in adjustment process
Measure FO2 is surveyedEqual to the oxygen demand F of sewageO2 is needed, then stop adjusting；
If the oxygen flow of (m+2) # unit is adjusted to maximum, the oxygen content F of sewageO2 is surveyedStill it is lower than the oxygen demand of sewage
FO2 is needed, then the oxygen flow of (m+2) # unit is adjusted to minimum, the PLC controller on the spot of starting (m+3) # unit carries out PID tune
Section, until the oxygen content F of sewageO2 is surveyedEqual to the oxygen demand F of sewageO2 is needed, stop adjusting.
By adopting the above-described technical solution, the invention has the following beneficial effects: more air blower units of the present invention
Automatic joint debugging system and its control method are Automatic Control, not only can may be used according to the adjusting of dissolved oxygen amount real-time perfoming air quantity
The start and stop that specified air blower unit is judged with automatic identification, can also automatically switch to next under air blower unit fault condition
Platform specifies unit operation, and guarantee whole process automatically controls, unattended, and response rapidly, is adjusted accurately, is accurate aeration energy conservation
Operation provides sound assurance.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the automatic joint debugging system of more air blower units of the invention；
Fig. 2 is the schematic diagram of the automatic joint debugging system of more air blower units of the invention；
Fig. 3 is initial start control flow in the control method of the automatic joint debugging system of more air blower units of the invention
Figure；
Fig. 4 is the high oxygen content of sewage in the control method of the automatic joint debugging system of more air blower units of the invention in dirt
The control flow chart when oxygen demand of water；
Fig. 5 is the oxygen content of sewage in the control method of the automatic joint debugging system of more air blower units of the invention lower than dirt
The control flow chart when oxygen demand of water.
Specific embodiment
The embodiment of the present invention is described in further detail with reference to the accompanying drawing.
Referring to Fig. 1, a kind of embodiment of the automatic joint debugging system of more air blower units, including more air blower units,
Main control cabinet, the dissolved oxygen sensor connecting respectively with the main control cabinet and oxygen demand acquire computing system, every air blower
Unit is provided with the PLC control cabinet on the spot controlled it, and PLC control cabinet is connected by optic fibre of looped network and the main control cabinet gas on the spot
It connects, the dissolved oxygen sensor is used to measure the oxygen content of sewage, and the oxygen demand acquisition computing system is for acquiring in sewage
Various parameters value and calculate the oxygen demand of sewage, then the aerobic magnitude of sewage is sent to main control by communication bus
Cabinet, the main control cabinet include PLC controller, and pid control algorithm is integrated in PLC controller, and the main control cabinet passes through control
Make the oxygen-supplying amount that PLC control cabinet on the spot adjusts corresponding air blower.
Referring to Fig. 3, the control method of the automatic joint debugging system of more above-mentioned air blower units, which is characterized in that if
The oxygen demand F of sewageO2 is neededMeet with air blower maximum stream flowWherein, m≤N-
1, N is the quantity of air blower unit, and main control cabinet sends enabled instruction to the PLC control cabinet on the spot of 1# unit to m# unit, together
When to 1# unit to (m-1) # unit transmitted traffic regulating command, the flow of 1# unit to (m-1) # unit is adjusted to maximum, so
Main control cabinet gives m# unit transmitted traffic regulating command afterwards, and the flow of m# unit is adjusted to minimum, then starts (m+1) # unit,
And the flow of (m+1) # unit is adjusted to minimum, the flow of m# unit is then adjusted to maximum, then passes through (m+1) # machine again
The PLC controller on the spot of group carries out PID adjusting, the oxygen demand F until being adjusted to sewageO2 is neededEqual to the oxygen content F of sewageO2 is surveyed, i.e.,
FO2 is needed=FO2 is surveyed.The above-mentioned stage is initial start up phase, and after the completion, unit enters normal operating phase, and runs 1# unit to (m
+ 1) # (m≤(N-1)) unit, main control cabinet read the oxygen content F of sewage in real timeO2 is surveyedIf the oxygen content F of sewageO2 is surveyedWith sewage
Oxygen demand FO2 is neededEqual (i.e. FO2 is surveyed=FO2 is needed), then maintain the status of air blower constant.
Referring to fig. 2, the oxygen demand F of sewageO2 is neededIt is variation, to meet sewage treatment process requirement, the oxygen content of sewage
FO2 is surveyedOxygen demand F should be equal toO2 is needed, i.e. FO2 is needed=FO2 is surveyed.Due to FO2 is neededVariation, FO2 is surveyedSince various consumption are also variation, if
Keep aerobic and oxygen consumption balance, it is necessary to air blower be kept to provide oxygen in real time, it may be assumed that
FO2 is needed=FO2 is surveyed+FO2 is supplied (1-1)
It can be indicated by converting 1-1 are as follows:
FO2 is supplied=FO2 is needed-FO2 is surveyed (1-2)
And oxygen-supplying amount FO2 is suppliedSize be to carry out air quantity by air blower and adjust to realize, air quantity regulative mode is according to drum
The type of blower is different, and by variable frequency adjustment, some is adjusted some by importing and exporting guide vane.
In this control system, FO2 is neededAs input quantity, FO2 is surveyedAs feedback quantity, FO2 is suppliedAs regulated quantity.
Referring to fig. 4, as the oxygen content F of sewageO2 is surveyedHigher than the oxygen demand F of sewageO2 is neededWhen, i.e. FO2 is surveyed>FO2 is needed, control cabinet is first
Judge whether (m+1) # unit is minimum discharge, if (m+1) # unit is minimum discharge, main control cabinet sends halt instruction to (m+
1) PLC controller on the spot of # unit makes it directly close (m+1) # unit；If (m+1) # unit is not minimum discharge, main control
Cabinet sends oxygen supply regulating command to the PLC controller on the spot of (m+1) # unit, and starting this, PLC controller carries out PID adjusting on the spot,
The flow of (m+1) # unit is reduced, until the oxygen content F of sewageO2 is surveyedWith the oxygen demand F of sewageO2 is neededIt is equal, then stop reducing (m
+ 1) flow of # unit；Such as the oxygen content F of sewageO2 is surveyedAlways above the oxygen demand F of sewageO2 is needed, then (m+1) # unit is reduced always
Flow until the flow of (m+1) # unit to its minimum discharge；When such as flow to its minimum discharge of (m+1) # unit, sewage
Oxygen content FO2 is surveyedThe still higher than oxygen demand F of sewageO2 is needed, then (m+1) # unit is closed, whether main control cabinet judges m# unit again
For minimum discharge, if m# unit is minimum discharge, main control cabinet sends halt instruction to the PLC controller on the spot of m# unit, directly
It connects and closes m# unit；If m# unit is not minimum discharge, main control cabinet sends oxygen supply regulating command to the PLC on the spot of m# unit
Controller, start this on the spot PLC controller carry out PID adjusting, reduce m# unit flow, until m# unit flow to it most
It is closed after small flow, then successively judges (m-1) # unit, whether the flow of (m-2) # unit ... 2# unit is minimum discharge.
Referring to Fig. 5, as the oxygen content F of sewageO2 is surveyedLower than the oxygen demand F of sewageO2 is neededWhen, i.e. FO2 is surveyed<FO2 is needed, main control cabinet head
First the flow of 1# unit to m# unit is successively detected, if any the unit for not operating in maximum stream flow, then main control cabinet is sent out
Send regulating command to the PLC controller on the spot of corresponding unit, this on the spot PLC controller according to the oxygen content F of sewageO2 is surveyedLower than dirt
The oxygen demand F of waterO2 is neededThe case where carry out PID adjusting, increase the oxygen flow of corresponding unit, if increasing the oxygen supply of corresponding unit
During flow, FO2 is surveyed=FO2 is needed,Then stop increasing, oxygen flow to its maximum oxygen supply for otherwise continuing to increase this unit is flowed
Amount, the unit for then proceeding to not operate in maximum stream flow to next in a like fashion carries out PID adjusting, until sewage contains
Oxygen amount FO2 is surveyedEqual to the oxygen demand F of sewageO2 is needed；
After if 1# unit were all adjusted to maximum stream flow to m# unit, the oxygen content F of sewageO2 is surveyedStill lower than sewage
Oxygen demand FO2 is needed, then the PLC controller on the spot for starting (m+1) # unit carries out PID adjusting, increases its oxygen flow, until FO2 is surveyed
=FO2 is neededStop adjusting afterwards；
If the oxygen flow of (m+1) # unit is adjusted to maximum, the oxygen content F of sewageO2 is surveyedStill it is lower than the oxygen demand of sewage
FO2 is needed, at this point, (m+1) # unit flow is directly adjusted to minimum by PLC controller on the spot by (m+1) # unit, then start (m+
2) # unit, and the oxygen flow of (m+2) # unit is adjusted to minimum, the flow of (m+1) # unit and (m+2) # unit is all located at this time
In minimum discharge, then first adjust (m+1) # unit flow, if in adjustment process sewage oxygen content FO2 is surveyedEqual to the need of sewage
Oxygen amount FO2 is needed, then stop adjusting；If (m+1) # unit is adjusted to maximum oxygen flow, the oxygen content F of sewageO2 is surveyedStill it is lower than sewage
Oxygen demand FO2 is needed, then the PLC controller on the spot for starting (m+2) # unit carries out PID adjusting, if sewage is oxygen-containing in adjustment process
Measure FO2 is surveyedEqual to the oxygen demand F of sewageO2 is needed, then stop adjusting；
If the oxygen flow of (m+2) # unit is adjusted to maximum, the oxygen content F of sewageO2 is surveyedStill it is lower than the oxygen demand of sewage
FO2 is needed, then the oxygen flow of (m+2) # unit is adjusted to minimum, the PLC controller on the spot of starting (m+3) # unit carries out PID tune
Section, until the oxygen content F of sewageO2 is surveyedEqual to the oxygen demand F of sewageO2 is needed, stop adjusting.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (4)
1. a kind of automatic joint debugging system of more air blower units, which is characterized in that including more air blower units, main controls
Cabinet, the dissolved oxygen sensor connecting respectively with the main control cabinet and oxygen demand acquire computing system, and every air blower unit is equal
Equipped with the PLC control cabinet on the spot controlled it, PLC control cabinet is connect by optical fiber with the main control cabinet on the spot, the dissolution
Lambda sensor is used to measure the oxygen content of sewage, and the oxygen demand acquisition computing system is used to acquire the various parameters value in sewage
And the oxygen demand of sewage is calculated, then send the aerobic magnitude of sewage to main control cabinet, the main control cabinet includes PLC control
Device processed is integrated with pid control algorithm in PLC controller, and by control, PLC control cabinet adjusts air blower to the main control cabinet on the spot
Oxygen-supplying amount.
2. a kind of control method of the automatic joint debugging system of more air blower units described in claim 1, which is characterized in that when
The oxygen demand of sewageWhen meeting following relationship with m platform blower unit maximum gas supply flowWherein, m≤N-1, N are the quantity of air blower unit, and main control cabinet gives 1# machine
The PLC control cabinet on the spot of group to m# unit sends enabled instruction, while referring to 1# unit to (m-1) # unit transmitted traffic adjusting
It enables, the flow of 1# unit to (m-1) # unit is adjusted to maximum, then main control cabinet gives m# unit transmitted traffic regulating command, will
The flow of m# unit is adjusted to minimum, then starts (m+1) # unit, and the flow of (m+1) # unit is adjusted to minimum, then adjusts
Then the flow of m# unit carries out PID adjusting by the PLC controller on the spot of (m+1) # unit again, until adjusting to maximum
To the oxygen demand of sewageEqual to the oxygen content of sewageI.e.
3. the control method of the automatic joint debugging system of more air blower units according to claim 2, which is characterized in that when
The oxygen content of sewageHigher than the oxygen demand of sewageWhen, i.e.,Control cabinet first determines whether (m+1) # machine
Whether group is minimum discharge, if (m+1) # unit is minimum discharge, main control cabinet sends halt instruction to (m+1) # unit just
Ground PLC controller makes it directly close (m+1) # unit；If (m+1) # unit is not minimum discharge, main control cabinet sends oxygen supply
The PLC controller on the spot of (m+1) # unit is given in regulating command, and starting this, PLC controller carries out PID adjusting on the spot, reduces (m+1) #
The flow of unit, until the oxygen content of sewageWith the oxygen demand of sewageIt is equal, then stop reducing (m+1) # machine
The flow of group；Such as the oxygen content of sewageAlways above the oxygen demand of sewageThe stream of (m+1) # unit is then reduced always
Amount until the flow of (m+1) # unit to its minimum discharge；When such as flow to its minimum discharge of (m+1) # unit, sewage contains
Oxygen amountThe still higher than oxygen demand of sewage(m+1) # unit is then closed, whether main control cabinet judges m# unit again
For minimum discharge, if m# unit is minimum discharge, main control cabinet sends halt instruction to the PLC controller on the spot of m# unit, directly
It connects and closes m# unit；If m# unit is not minimum discharge, main control cabinet sends oxygen supply regulating command to the PLC on the spot of m# unit
Controller, start this on the spot PLC controller carry out PID adjusting, reduce m# unit flow, until m# unit flow to it most
It is closed after small flow, then successively judges (m-1) # unit, whether the flow of (m-2) # unit ... is minimum discharge.
4. the control method of the automatic joint debugging system of more air blower units according to claim 2, which is characterized in that when
The oxygen content of sewageLower than the oxygen demand of sewageWhen, i.e.,Main control cabinet first to 1# unit extremely
The flow of m# unit is successively detected, if any the unit for not operating in maximum stream flow, then main control cabinet send regulating command to
The PLC controller on the spot of corresponding unit, this on the spot PLC controller according to the oxygen content of sewageLower than the oxygen demand of sewageThe case where carry out PID adjusting, increase the oxygen flow of corresponding unit, if in the mistake for increasing corresponding unit oxygen flow
Cheng Zhong, Then stop increasing, otherwise continues to increase the oxygen flow of this unit to its maximum oxygen flow, so
The unit for continuing not operating in maximum stream flow to next in a like fashion afterwards carries out PID adjusting, until the oxygen content of sewageLower than the oxygen demand of sewage
After if 1# unit were all adjusted to maximum stream flow to m# unit, the oxygen content of sewageIt is still aerobic lower than sewage
AmountThe PLC controller on the spot for then starting (m+1) # unit carries out PID adjusting, increases its oxygen flow, untilStop adjusting afterwards；
If the oxygen flow of (m+1) # unit is adjusted to maximum, the oxygen content of sewageStill it is lower than the oxygen demand of sewageAt this point, by (m+1) # unit, (m+1) # unit flow is directly adjusted to minimum by PLC controller on the spot, then starts (m
+ 2) # unit, and the oxygen flow of (m+2) # unit is adjusted to minimum, the flow of (m+1) # unit and (m+2) # unit is all at this time
In minimum discharge, then first adjust (m+1) # unit flow, if in adjustment process sewage oxygen contentEqual to sewage
Oxygen demandThen stop adjusting；If (m+1) # unit is adjusted to maximum oxygen flow, the oxygen content of sewageIt is still low
In the oxygen demand of sewageThe PLC controller on the spot for then starting (m+2) # unit carries out PID adjusting, if dirty in adjustment process
The oxygen content of waterEqual to the oxygen demand of sewageThen stop adjusting；
If the oxygen flow of (m+2) # unit is adjusted to maximum, the oxygen content of sewageStill it is lower than the oxygen demand of sewageThe oxygen flow of (m+2) # unit is then adjusted to minimum, the PLC controller on the spot of starting (m+3) # unit carries out PID tune
Section, until the oxygen content of sewageEqual to the oxygen demand of sewageStop adjusting.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110510740A (en) * | 2019-08-27 | 2019-11-29 | 危杏 | Sewage simultaneous nitrification-denitrification aeration control system and aeration method |
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Application publication date: 20190528 |