CN105923742B - Sewage treatment plant's aerator drag characteristic real-time monitoring system and blocking method for early warning - Google Patents
Sewage treatment plant's aerator drag characteristic real-time monitoring system and blocking method for early warning Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
- C02F2209/006—Processes using a programmable logic controller [PLC] comprising a software program or a logic diagram
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/38—Gas flow rate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The present invention relates to a kind of sewage treatment plant's aerator drag characteristic real-time monitoring system and block method for early warning, wherein, sewage treatment plant's aerator drag characteristic real-time monitoring system includes measuring and controlling, input/output module, system controller and human-computer interaction interface, measuring and controlling includes the main pipe gas gauge being mounted on sewage treatment plant's aeration main pipe, branch pipe air-flow on sewage treatment plant's aeration branch pipe etc. compares regulating valve, branched pipe gas flowmeter and/or branched pipe gas pressure gauge, and water inlet fluid flowmeter on the water inlet preceding pipeline of aeration tank and/or on aeration tank with the aeration zone liquid level gauge of aerated space opposite position；Input/output module is connected by cable with each measuring and controlling, and system controller is directly connected to air blower and input/output module, and human-computer interaction interface is connected with system controller.
Description
Technical field
The invention belongs to sewage treatment fields more particularly to a kind of sewage treatment plant's aerator drag characteristic to monitor in real time and be
System and blocking method for early warning.
Background technology
Wastewater treatment in China factory rules and regulations mould is quickly grown, and generally aerobic aeration technology is used to realize pollutant in prevailing technology
Stablize and effectively cuts down.According to Document system, the power consumption of aerating system occupies the 40%~60% of the total power consumption of sewage treatment plant,
Therefore aerating system cost control technique sewage disposal it is energy-saving in be taken seriously.The energy consumption of aerating system is mainly come
From in the local resistance loss of the energy loss of air blower, the drag losses of pipe-line system and aerator.Wherein, air blower and pipe
The energy loss of road system generally changes according to the adjustment of technique, therefore can be adjusted using process optimization；And aerator
Local losses mainly influenced by pipeline blockage, aerator breakage, surface contamination etc., often increase as time increases,
Generally controlled by cleaning or replacing aerator.Common aerator plugging reason has saline crystallization precipitating, biomembrane attached
Growth, pipeline condensed water or sludge blockage etc., the possible reciprocal effect of these reasons and promotion, it is therefore desirable to detect and sentence in time
The drag characteristic of disconnected aerator, predicts resistance variation tendency, takes treatment measures in time.But since aerator is submerged in water
Under, it is difficult to find breakage and the contamination phenomenon of aerator.
Currently, generally by observe aeration state, detection air blower back pressure come judge aerator whether need cleaning or more
It changes.It is a kind of qualitative method to observe aeration state, by observing the bubble shape of aeration tank liquid level come the dirt of qualitative supposition aerator
Damage situation.This method can only be used in the case where differentiating Severe blockage or breakage, can not carry out early warning, also cannot be timely
It takes preventive measures.It is a kind of quantitative detecting method to detect blower export pressure, passes through blower export pressure trend
Aerator stopping state can be judged roughly.But air blower output pressure is by aeration pit level, valve regulated, temperature etc.
Many factors interfere, and interference magnitude is big, therefore, it is difficult to identify that amplitude is smaller, the slow resistance raising factor of variation, cause not
The resistance variation tendency that can find aerator in time is unable to the cleaning demand of early warning aerator, keeps aerator surface contamination isometric
Phase slowly accumulates, and the repair of aerator large area finally occurs, replaces and stop production, causes greater loss.
In addition, China's underground sewage treatment works are quickly grown, pond face closure brings great difficulty and very to aerator replacement
High cost, therefore there is an urgent need to be capable of the method for accurate measurements and control aerator drag losses, so as in time to aerator reality
Corresponding treatment measures are applied, the service life of aerator is extended, reduce aerating system energy consumption.
Invention content
In view of the above-mentioned problems, being monitored in real time the object of the present invention is to provide a kind of sewage treatment plant's aerator drag characteristic and being
Aerated space drag characteristics value can be monitored and be exported in real time to system and blocking method for early warning on-line, to judge aerator work resistance
Force characteristic provides support for aerator cleaning and blast engine energy saving consumption reduction.
To achieve the above object, the present invention takes following technical scheme：A kind of sewage treatment plant's aerator drag characteristic is real
When monitor system, which is characterized in that the system includes measuring and controlling, input/output module, system controller and man-machine friendship
Mutual interface, wherein measuring and controlling includes the main pipe gas gauge being mounted on sewage treatment plant's aeration main pipe, is mounted on
Branch pipe air-flow on sewage treatment plant's aeration branch pipe etc. than regulating valve, branched pipe gas flowmeter and/or branched pipe gas pressure gauge, with
And water inlet fluid flowmeter on the water inlet preceding pipeline of aeration tank and/or on aeration tank it is opposite with aerated space
Answer the aeration zone liquid level gauge of position；Input/output module is connected by cable with each measuring and controlling, system controller with
Air blower and input/output module are directly connected to, and human-computer interaction interface is connected with system controller.
Branch pipe air-flow etc. is than regulating valve, the number of aeration zone liquid level gauge, branched pipe gas flowmeter and/or branched pipe gas pressure gauge
The quantity of mesh and aeration branch pipe in sewage treatment plant and aerated space matches.
System controller uses programmable controller；Human-computer interaction interface uses touch screen.
A kind of sewage treatment plant's aerator blocking method for early warning, it is real based on sewage treatment plant's aerator drag characteristic
When monitor system, include the following steps：
1) monitoring data of each measuring and controlling are acquired in real time, and carry out data smoothing processing, obtain aerated space
Following parameter：Main pipe gas pressure P0, unit Pa, by being supervised than the main pipe gas gauge before regulating valve positioned at branch pipe air-flow etc.
It surveys；Branch pipe air-flow etc. is than the valve opening D of regulating valve, range 0~1, dimensionless, by branch pipe air-flow etc. than adjusting valve unit monitoring；It exposes
Gas region flow of inlet water Qin, it is equal to the sum of processing water, sludge reflux amount and mixed-liquor return amount, unit m3/ hr, by into aqueous
Flowmeter body monitors；Aeration tank depth of water HL, unit m monitors by aeration zone liquid level gauge；Branched pipe gas flow Qair, unit m3/ hr,
It is monitored by branched pipe gas flowmeter；Branched pipe gas pressure P1, unit Pa, by positioned at branch pipe air-flow etc. than the branch pipe after regulating valve
Gas gauge monitors；
2) pressure loss of aerated space is calculated in real time according to obtained aerated space parameter, wherein single aerated space
The calculation formula of the pressure loss is：
In formula, Δ P is the aerated space pressure loss, unit Pa；hLHeight for aerated space working face apart from aeration tank bottom
Degree, unit m；AsFor the service area of single aerator, unit m2；ρ0For the density of mixed liquor, units/kg/m3；G adds for gravity
Speed, unit m/s2；
3) according to the aerated space pressure loss being calculated, the drag losses system of aerator in aerated space is calculated in real time
Number, and the curve that frictional-loss coefficient changes over time is drawn, while recording and being shown on human-computer interaction interface in real time；Its
In, the calculation formula of frictional-loss coefficient is：
In formula, ξ is frictional-loss coefficient, dimensionless；V is flow velocity of the gas by aerator, unit m/s；QairFor branch pipe
Gas flow values, unit need to be scaled m3/s；N is the corresponding aerator quantity of branched pipe gas flow, unit pc；A is single exposes
The work area of gas device, unit m2/pc；ρ is the density of air, and units/kg/m3, usual value is 1；
4) dynamic of aerated space under current state is described according to the aerated space frictional-loss coefficient ξ being calculated in real time
Drag characteristic, more current frictional-loss coefficient and fuzzy evaluation grade obtain aerator obstruction and damaged degree, Yi Jixu
The specific aim treatment measures to be taken；
5) according to the change curve of the aerated space frictional-loss coefficient ξ of historical record, analysis frictional-loss coefficient is at any time
Between the trend that changes, judge whether aerator occurs damaged or obstruction, and the countermeasure of processing is provided according to judging result；
6) energy loss cost is calculated according to the aerated space pressure loss Δ P being calculated in real time, and draws and can consumes
The curve that cost changes over time is lost, while recording and being shown on human-computer interaction interface in real time；Wherein, energy loss cost
Calculation formula is：
In formula, M is energy loss cost, the i.e. electricity charge of aerator drag losses, identical element/d；A is electricity Unit Price, unit
Member/kWh；η accounts for the ratio of institute's consuming electric power, unit % for air blower useful work.
7) curve is changed over time according to energy loss cost, analysis and judges profit or loss of operation, judgement, which is taken, cleans and more
The necessity of aerator measure is changed, determine cleaning and replaces the operating time point of aerator.
In the step 1), as the flow of inlet water Q that water inlet fluid flowmeter monitoring aerated space is not arrangedinOr exposure is not set
Gas area liquid level gauge monitors aeration tank depth of water HLWhen, according to aerated space flow of inlet water QinWith aeration tank depth of water HLCorrelation,
The data not monitored directly are calculated using existing monitoring data；Aerated space flow of inlet water QinWith aeration tank depth of water HLBetween pass
It is that expression formula is：
In formula, h0For the aeration tank depth of water under hydrostatic condition, the i.e. distance of aeration tank distance from bottom liquid surface, unit m；Qst
For the flow of inlet water under design conditions, unit m3/hr；hstFor design conditions flow of inlet water QstThe lower aeration tank depth of water, unit m.
In the step 1), branched pipe gas flow Q is monitored when branched pipe gas flowmeter is not arrangedairOr branch pipe gas is not set
Body pressure gauge monitors branched pipe gas pressure P1When, according to branched pipe gas flow QairWith branched pipe gas pressure P1Correlation, make
The data not monitored directly are calculated with existing monitoring data；Branched pipe gas flow QairWith branched pipe gas pressure P1Between relationship
Expression formula is：
In formula, KV,mIt is branch pipe air-flow etc. than the discharge coefficient corresponding to regulating valve maximum opening, looking into product description can
, dimensionless；R is the regulating ratio than regulating valve such as branch pipe air-flow, and looking into product description can obtain, dimensionless.
The fuzzy evaluation grade of frictional-loss coefficient in the step 4) is the history aerated space according to bulk registration
Drag losses and frictional-loss coefficient, and be compared with history or other techniques, formation is exposed for assessing in aerated space
The obstruction of gas device and the index of breakage judge the serious of aerator drag losses according to the numberical range of frictional-loss coefficient
Degree；The fuzzy evaluation grade of frictional-loss coefficient specifically includes：When frictional-loss coefficient fluctuation range is 107~5 × 108When,
Resistance levels are L ranks, and drag losses degree is drag losses very little, and typical scenario is perforated pipe aerating regulation；When drag losses system
Number fluctuation range is 5 × 108~109When, resistance levels are M ranks, and drag losses degree is that drag losses are larger, typical scenario
For film aeration, sapphire discs；When frictional-loss coefficient fluctuation range is 109~5 × 109When, resistance levels are H ranks, drag losses
Degree is that drag losses are serious, and typical scenario is the sapphire discs being used for a long time；When frictional-loss coefficient fluctuation range is 5 × 109
~1010When, resistance levels are HH ranks, and drag losses degree is that drag losses are extremely serious, and typical scenario is aeration pipeline mud
Water silts up.
The standard and countermeasure that curve judges aerator state are changed over time according to frictional-loss coefficient in the step 5)
It specifically includes：When curvilinear motion type is random fluctuation, indicate that aerator normal operation, operating countermeasure are to maintain to run；When
Curvilinear motion type is to indicate that breakage occurs in aerator, operating countermeasure is to repair or replace aerator when declining suddenly；Work as song
Line change type is to indicate that aerator surface is blocked when slowly rising, and operating countermeasure is to carry out regular medicine to aerator
Agent is cleaned；When curvilinear motion type is rapid increase, aeration pipeline Severe blockage has occurred in expression, and operating countermeasure is to exclude mud
Water replaces aerator.
Criterion in the step 7) is：When energy loss cost and the difference of initial value are more than the cleaning of aerator
When cost, need to execute cleaning operation；When energy loss cost and the difference of initial value are more than aerator replacement cost, need
Execute replacement operation.
The invention adopts the above technical scheme, which has the following advantages：1, the present invention can be monitored and be shown in real time
The resistance performance of aerator, and identify resistance abnormal patterns, hence it is evident that it improves according to blower export wind pressure to drag characteristics
Fuzzy Judgment can support the precision management to aerator clean and maintenance.2, present system is compact-sized, and algorithm is simple,
Transformation is easier in existing engineering, and equipment and maintenance cost are low, is easy to promote and be implemented.3, the present invention can be calculated and be exported
The economic datas such as energy consumption, drag losses cost, to support the energy-saving management of technique.
Description of the drawings
Fig. 1 is the arrangement schematic diagram of the measuring and controlling of the present invention；
Fig. 2 is the structural schematic diagram of sewage treatment plant's aerator drag characteristic real-time monitoring system of the present invention；
Fig. 3 is the aerated space depth of water result of calculation of embodiment 1；
Fig. 4 is the drag losses history curve of embodiment 1；
Fig. 5 is the frictional-loss coefficient history curve of embodiment 1；
Fig. 6 is that the drag losses of embodiment 1 increase cost；
Fig. 7 is that the aeration branch pipe gas flow of embodiment 2 calculates result；
Fig. 8 is the frictional-loss coefficient history curve of embodiment 2.
Specific implementation mode
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
Arrow direction in attached drawing 1 indicates the flow direction of liquid.
As depicted in figs. 1 and 2, a kind of sewage treatment plant's aerator drag characteristic real-time monitoring system provided by the invention,
It includes measuring and controlling 1, input/output module 2, system controller 3 and human-computer interaction interface 4, wherein measures control dress
1 is set including main pipe gas gauge 11, branch pipe air-flow etc. than regulating valve 12, water inlet fluid flowmeter 13 and/or aeration zone liquid level
Meter 14 and branched pipe gas flowmeter 15 and/or branched pipe gas pressure gauge 16.Main pipe gas gauge 11 is mounted on sewage disposal
On the aeration main pipe 5 of factory, branch pipe air-flow etc. is pacified than regulating valve 12, branched pipe gas flowmeter 15 and/or branched pipe gas pressure gauge 16
On aeration branch pipe 6, water inlet fluid flowmeter 13 is on the pipeline before 7 water inlet of aeration tank, aeration zone liquid level gauge 14
The position corresponding with aerated space on aeration tank 7.
Input/output module 2 is connected by cable with each measuring and controlling 1；System controller 3 and air blower 9 and defeated
Enter output module 2 to be directly connected to, meanwhile, system controller 3 is connect by input/output module 2 with each measuring and controlling 1, real
The real-time communication of existing operating status and monitored parameters, transmits data；System controller 3 acquires the monitoring of each measuring and controlling 1
The status data of data and air blower 9 carries out the resistance coefficient of calculating aerator 8 after data smoothing processing；Human-computer interaction interface 4
It is connected with system controller 3, the resistance coefficient for recording and showing aerator 8 in real time, auxiliary process personnel are to aerator 8
Drag characteristic analyzed and judged.
In above-described embodiment, branch pipe air-flow etc. than regulating valve 12, aeration zone liquid level gauge 14, branched pipe gas flowmeter 15 and/
Or branched pipe gas pressure gauge 16 number and sewage treatment plant in the quantity of aeration branch pipe 6 and aerated space match.
In above-described embodiment, system controller 3 is using programmable controller (PLC), such as Siemens S7-300.
In above-described embodiment, human-computer interaction interface 4 such as grinds magnificent touch screen integrated machine using touch screen (HMI).
In order to assess the drag characteristic of aerator 8, realize that the real-time detection of aerator resistance and diagnosis early warning, the present invention carry
A kind of sewage treatment plant's aerator has been supplied to block method for early warning, technical thought is as follows：The local resistance damage of aerator 8 is calculated first
It loses, excludes the influences of many factors to air blower back pressure such as flow of inlet water fluctuation, gas valve adjusting, air blower adjusting, obtain
The energy consumption of actual loss；Secondly, nondimensional frictional-loss coefficient is calculated, the shadow of gas flow rate Partial Resistance loss is excluded
It rings, the drag losses feature for lateral comparison different time or different aerators 8；Finally, it builds at signal acquisition and data
Reason system assists operations staff's decision with the detection method of above-mentioned principle using visualization interface.At above-mentioned sewage
Manage factory aerator drag characteristic real-time monitoring system, sewage treatment plant's aerator of the invention block method for early warning specifically include with
Lower step：
1) system controller 3 acquires the monitoring data of each measuring and controlling 1 by input/output module 2 in real time, goes forward side by side
Row data smoothing processing obtains the following parameter of aerated space：Main pipe gas pressure P0, unit Pa, by being located at branch pipe air-flow etc.
It is monitored than the main pipe gas gauge 11 before regulating valve 12；Branch pipe air-flow etc. than regulating valve 12 valve opening D, range 0~
1, dimensionless is monitored by branch pipe air-flow etc. than regulating valve 12；Aerated space flow of inlet water Qin, it is equal to processing water, sludge reflux
The sum of amount and mixed-liquor return amount, unit m3/ hr is monitored by water inlet fluid flowmeter 13；Aeration tank depth of water HL, unit m, by exposing
Gas area liquid level gauge 14 monitors；Branched pipe gas flow Qair, unit m3/ hr is monitored by branched pipe gas flowmeter 15；Branched pipe gas pressure
Power P1, unit Pa, by being monitored than the branched pipe gas pressure gauge 16 after regulating valve 12 positioned at branch pipe air-flow etc..Meanwhile system control
(value is more than P to the operating status (being currently running) and outlet pressure of the acquisition of device 3 air blower 9 processed1) data, to verify branched pipe gas
Pressure P1。
As the flow of inlet water Q that the water inlet monitoring of fluid flowmeter 13 aerated space is not arrangedinOr aeration zone liquid level gauge is not set
14 monitoring aeration tank depth of water HLWhen, it can be according to aerated space flow of inlet water QinWith aeration tank depth of water HLCorrelation, using
There are monitoring data to calculate the data not monitored directly.Aerated space flow of inlet water QinWith aeration tank depth of water HLBetween relationship expression
Formula is as follows：
In formula, h0For the aeration tank depth of water under hydrostatic condition, the i.e. distance of aeration tank distance from bottom liquid surface, unit m；Qst
For the flow of inlet water under design conditions, unit m3/hr；hstFor design conditions flow of inlet water QstThe lower aeration tank depth of water, unit m.
Branched pipe gas flow Q is monitored when branched pipe gas flowmeter 15 is not arrangedairOr the prison of branched pipe gas pressure gauge 16 is not set
Survey branched pipe gas pressure P1When, it can be according to branched pipe gas flow QairWith branched pipe gas pressure P1Correlation, use existing prison
Measured data calculates the data not monitored directly.Branched pipe gas flow QairWith branched pipe gas pressure P1Between relational expression such as
Under：
In formula, KV,mIt is branch pipe air-flow etc. than the discharge coefficient corresponding to regulating valve maximum opening, looking into product description can
, dimensionless；R is the regulating ratio than regulating valve such as branch pipe air-flow, and looking into product description can obtain, dimensionless.
2) system controller 3 calculates the pressure loss of each aerated space according to obtained aerated space parameter in real time respectively.
The calculation formula of the single aerated space pressure loss is as follows：
In formula, Δ P is the aerated space pressure loss, unit Pa；hLHeight for aerated space working face apart from aeration tank bottom
Degree, unit m；AsFor the service area of single aerator, unit m2；ρ0For the density of mixed liquor, units/kg/m3；G adds for gravity
Speed, unit m/s2。
3) system controller 3 calculates aerator in aerated space in real time according to the aerated space pressure loss being calculated
Frictional-loss coefficient, and draw the curve that frictional-loss coefficient changes over time, while recording and being shown in man-machine friendship in real time
On mutual interface 4.
The calculation formula of frictional-loss coefficient is as follows：
In formula, ξ is frictional-loss coefficient, dimensionless；V is flow velocity of the gas by aerator, unit m/s；QairFor branch pipe
Gas flow values, unit need to be scaled m3/s；N is the corresponding aerator quantity of branched pipe gas flow, unit pc；A is single exposes
The work area of gas device, unit m2/pc；ρ is the density of air, and units/kg/m3, usual value is 1.
4) according to the history aerator drag losses and frictional-loss coefficient of bulk registration, and with history or other techniques into
Row compares, and the index for assessing the obstruction of aerator and breakage in aerated space can be formed, according to frictional-loss coefficient
Numberical range judge the severity of aerator drag losses, to establish the fuzzy evaluation grade of frictional-loss coefficient, such as
Shown in the following table 1.According to the aerated space frictional-loss coefficient being calculated in real time, aerated space under current state can be described
Dynamic resistance characteristic is compared with the fuzzy evaluation grade of frictional-loss coefficient, obtains to aerator by dynamic resistance characteristic
The assessment result of obstruction and breakage；According to assessment result, the time and countermeasure that we can be handled in time, to take
Targetedly treatment measures.
The fuzzy rating level of 1 frictional-loss coefficient of table
| Rank | Value range | Degree | Typical scenario |
| L | 107~5 × 108 | Drag losses very little | Perforated pipe aerating regulation |
| M | 5×108~109 | Drag losses are larger | Film aeration, sapphire discs |
| H | 109~5 × 109 | Drag losses are serious | The sapphire discs of long-time service |
| HH | 5×109~1010 | Drag losses are extremely serious | Aeration pipeline muddy water silts up |
5) according to the change curve of the aerated space frictional-loss coefficient of historical record, analysis frictional-loss coefficient is at any time
The trend of variation, judges whether aerator has occurred damaged and obstruction, and the countermeasure of processing is provided according to judging result.Judge mark
Standard is：When curve rapid decrease, indicate that breakage occurs in aerator；When curve slowly rises, indicate that aerator has occurred
It blocks；When curve steeply rises, aeration pipeline Severe blockage has occurred in expression.Shown in table 2 specific as follows.
The meaning and countermeasure of 2 frictional-loss coefficient curvilinear motion of table
| Curvilinear motion type | Curve meaning | Operating countermeasure |
| Random fluctuation | Normal operation | Maintain operation |
| Decline suddenly | Aerator ruptures | Aerator is replaced in repair |
| Slowly rise | Aerator surface blocks | Regular medicament cleaning |
| Rapid increase | It is aerated pipeline Severe blockage | It excludes muddy water, replace aerator |
6) system controller 3 calculates energy loss cost in real time according to the pressure loss of aerated space, and draws and can consume
The curve that cost changes over time is lost, while recording and being shown on human-computer interaction interface 4 in real time.
The calculation formula of energy loss cost is as follows：
In formula, M is energy loss cost, the i.e. electricity charge of aerator drag losses, identical element/d；A is electricity Unit Price, unit
Member/kWh；η accounts for the ratio of institute's consuming electric power, unit % for air blower useful work.
7) curve is changed over time according to energy loss cost, analysis and judges profit or loss of operation, judgement, which is taken, cleans and more
The necessity of aerator measure is changed, determine cleaning and replaces the operating time point of aerator.Criterion is：When energy loss at
When the difference of this and initial value is more than the cleaning cost of aerator, cleaning operation can perform；When energy loss cost and initial value
Difference be more than aerator replacement cost when, need execute replacement operation.
The present invention provides the method and index of more accurate description aerator drag characteristic variation tendency, realize it is in situ and
Observation in real time and calculating predict resistance variation tendency, take treatment measures in time to monitor drag characteristic in real time.This side
Face is cleaned in time after can assessing the blocked state of aerator, is prolonged the service life；On the other hand it can monitor on-line and control
The drag losses of aerator avoid the too fast raising of air blower back pressure, to reduce fan energy use.It is embodied below with two
Example, the sewage treatment plant's aerator drag characteristic real-time monitoring system further illustrated the present invention and blocking method for early warning.
Embodiment one：
Certain AAO process spent waters treatment plant uses corundum spherical shape aeration plate, 100,000 ton day for the treatment of scale to be divided into two parallel
Series, totally 10 aerated spaces.Arrange that measuring and controlling, concrete mode are by the way of as shown in Figure 1：It is parallel at two
The electromagnetic type feed water flow gauge of arrangement E+H companies in the back with water inlet line of series, the gas pressure of arrangement E+H companies on aeration main pipe
Power meter is respectively arranged the gas gauge and gaseous mass flowmeter and Domestic V shape of E+H companies on 10 aeration branch pipes
Ball valve etc. is than adjusting branched pipe gas flow, because technological reason does not install the liquid level gauge of aerated space.System controller uses west gate
The programmable controller of sub- S7-300 writes program using ladder diagram wherein；Each measuring and controlling and system controller
Input/output module connects, and carries out implementation communication by the central processing unit of input/output module and system controller, transmits
Data；The monitoring data of the central processing unit online acquisition measuring and controlling of system controller, after carrying out data smoothing processing,
Calculate the aeration resistance coefficient of aeration branch pipe corresponding region.Human-computer interaction interface is to grind magnificent touch screen integrated machine, is used wherein
Configuration software writes program, the historical data that record and display system controller are acquired and be calculated in real time, backman artist
Member is analyzed and is judged to aerator drag characteristic.The aerator drag losses and resistance being calculated in real time by controller
Loss coefficient can be used for assessing the obstruction and breakage of aerator, to which targetedly treatment measures are taken in guidance
The monitoring data that measuring and controlling is acquired by system controller, obtain the following parameter of aerated space：Aeration
Region flow of inlet water QinEqual to the sum of processing water, sludge reflux amount and mixed-liquor return amount, fluctuation range is 5700~
6200m3/hr；Branched pipe gas flow QairValue range be 1000~2000m3/hr；Branched pipe gas pressure P1Value range
For 65~69kPa；And main pipe gas pressure P0With the valve opening D of branch pipe air-flow grade ratio regulating valve.
Due to being fitted without aeration zone liquid level gauge, fail to directly acquire aeration tank depth of water HL, but can be according to real-time monitoring
Aerated space flow of inlet water QinIt is calculated using formula (1)；In formula, depth of water h in aeration tank under hydrostatic condition0It is discharged equal to aeration tank
Weir height, value 6.50m；Flow of inlet water Q under design conditionsstConsider inside and outside return flow, takes 6000m3/hr；Design work
Condition flow of inlet water QstLower aeration tank depth of water hstValue 6.75m；To obtain aeration tank depth of water HLVariation range be about 6.72~
6.78m, specific result of calculation are as shown in Figure 3.
According to obtained aerated space parameter, the current pressure that aerated space is calculated using formula (3) is lost；In formula, expose
Height h of the gas device working face apart from aeration tank bottomLTake 0.20m；The service area A of single aeratorsValue is 0.4m2/pc；It is mixed
Close the density p of liquid0It is approximately water, value 103kg/m3；Gravity acceleration g value 9.8m/s2；Specific result of calculation such as Fig. 4 institutes
Show.
According to the aerated space pressure loss being calculated, frictional-loss coefficient is calculated using formula (4)；In formula, branch pipe
Gas flow values QairValue range be 1000~2000m3/ hr, is scaled 0.28~0.52m3/s；Branched pipe gas flow corresponds to
Aerator quantity n take 600pc；The work area A of single aerator is calculated by diameter 0.26m, value 0.05m2/pc；Air
Density p value 1kg/m3；Specific result of calculation is as shown in Figure 5.
Numberical range belonging to frictional-loss coefficient ξ judges the severity of aerator drag losses, can be with history
Or other techniques are compared, fuzzy evaluation grade is as shown in table 1.As can be seen from Figure 3, the frictional-loss coefficient of the sewage treatment plant
It is 2~3 × 109, grade is H grades, and the drag losses cost of aerator is larger.
Secondly, can be judged whether that damaged and obstruction has occurred according to the history curve of frictional-loss coefficient ξ, such as Fig. 5 institutes
Show, when curve rapid decrease, indicates that breakage occurs in aerator；When slow rise, indicate that aerator is blocked；When
When steeply rising, aeration pipeline Severe blockage has occurred in expression.
Finally, according to the pressure loss for the aerated space being calculated, energy loss cost is calculated using formula (5) in real time
M；In formula, 0.5 yuan/kWh of electricity Unit Price a values；Useful work accounts for the ratio η values 50% of institute's consuming electric power；Branched pipe gas flow value
Qair600~1200m of fluctuation range3/hr；Specific result of calculation is as shown in Figure 6.
According to energy loss cost M, profit or loss of operation is analyzed and judged, early warning is carried out to cleaning and replacing measure.Such as Fig. 6 institutes
Show, the initial aerator pressure loss cost M of the case sewage treatment plant is 50 yuan/d；As run time increases, cost M is lost
It can gradually increase.When M values are more than 150 yuan/d, aerator obstruction causes the increased amplitude of energy loss to be more than 100 yuan/d, high
In the cleaning cost of aerator, it is proposed that execute cleaning operation.When M values be more than 250 yuan/d when, drag losses amplitude be more than 200 yuan/
D, it may be considered that execute aerator replacement or disassembly, cleaning.
Embodiment two：
Certain underground sewage treatment works, arranges measuring and controlling by the way of as shown in Figure 1, is specifically mounted with into aqueous
Flowmeter body, aeration main pipe gas gauge, aeration branch pipe gas gauge, aeration branch pipe air-flow etc. are than regulating valve (diamond valve)
Deng not installing aeration zone liquid level gauge, branched pipe gas mass flowmenter.
Using mode identical with embodiment one, according to the aerated space flow of inlet water Q monitored in real timeinUsing formula (1)
Estimation calculates the water depth value H of aerated spaceL。
Due to not installing branched pipe gas mass flowmenter, need according to the main pipe gas pressure P monitored in real time0With branch pipe gas
The valve opening D and branched pipe gas pressure value P than regulating valve such as stream1, branched pipe gas flow value Q is calculated according to formula (2)air；
In formula, the variation range than the valve opening D of regulating valve such as branch pipe air-flow is 50~100%；It is such than regulating valve maximum opening
Corresponding flow coefficient kV,mBy valve, producer provides, and is tabled look-up value 320 according to caliber；Deng the regulating ratio R than regulating valve by valve
Door producer provides, value 30；Main pipe gas pressure value P0Fluctuation range be 79~82kPa；Branched pipe gas pressure after regulating valve
Value P1Fluctuation range be 75~77kPa.When branch pipe air-flow etc. is 60% and 100% than the valve opening D of regulating valve, calculate
Flow is respectively 320 and 1500, the branched pipe gas flow value Q to be calculatedairRespectively 1300 and 7500m3/hr.1
For periodic adjustment branch pipe air-flow etc. than the valve opening D of regulating valve, obtained result of calculation is as shown in Figure 7 in it, wherein dotted line is
For branch pipe air-flow etc. than the valve opening D of regulating valve, solid line is branched pipe gas flow value Qair。
According to obtained aerated space parameter, the pressure loss of aerated space is calculated using formula (3)；Then according to according to meter
The obtained aerated space pressure loss calculates frictional-loss coefficient using formula (4), and the results are shown in Figure 8.
It can be seen that the frictional-loss coefficient fluctuation range of the present embodiment is 1~2 × 109, resistance levels also in H ranks,
Drag losses are larger, need to reinforce clean and maintenance.From history curve it is found that after using 1 year, on frictional-loss coefficient is apparent
It rises, the right times of clean and maintenance operation is may determine that according to the curve.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, installation position and its connection type etc.
It may be changed, every equivalents carried out based on the technical solution of the present invention and improvement should not arrange
In addition in protection scope of the present invention.
Claims (8)
1. a kind of sewage treatment plant's aerator blocks method for early warning, is monitored in real time based on sewage treatment plant's aerator drag characteristic and be
System, the system include measuring and controlling, input/output module, system controller and human-computer interaction interface,
Wherein, measuring and controlling includes the main pipe gas gauge being mounted on sewage treatment plant's aeration main pipe, is mounted on dirt
Branch pipe air-flow on water treatment plant's aeration branch pipe etc. than regulating valve, branched pipe gas flowmeter and/or branched pipe gas pressure gauge, and
Water inlet fluid flowmeter on the water inlet preceding pipeline of aeration tank and/or on aeration tank it is corresponding with aerated space
The aeration zone liquid level gauge of position；Input/output module is connected by cable with each measuring and controlling, system controller and drum
Wind turbine and input/output module are directly connected to, and human-computer interaction interface is connected with system controller；
This approach includes the following steps：
1) monitoring data of each measuring and controlling are acquired in real time, and carry out data smoothing processing, obtain the as follows of aerated space
Parameter：Main pipe gas pressure P0, unit Pa, by being monitored than the main pipe gas gauge before regulating valve positioned at branch pipe air-flow etc.；
Branch pipe air-flow etc. is than the valve opening D of regulating valve, range 0~1, dimensionless, by branch pipe air-flow etc. than adjusting valve unit monitoring；Aeration zone
Domain flow of inlet water Qin, it is equal to the sum of processing water, sludge reflux amount and mixed-liquor return amount, unit m3/ hr, by water inlet liquid flow
Gauge monitors；Aeration tank depth of water HL, unit m monitors by aeration zone liquid level gauge；Branched pipe gas flow Qair, unit m3/ hr, by propping up
Pipe gas flowmeter monitors；Branched pipe gas pressure P1, unit Pa, by positioned at branch pipe air-flow etc. than the branched pipe gas after regulating valve
Pressure gauge monitors；
2) pressure loss of aerated space is calculated in real time according to obtained aerated space parameter, wherein single aerated space pressure
The calculation formula of loss is：
In formula, Δ P is the aerated space pressure loss, unit Pa；hLHeight for aerated space working face apart from aeration tank bottom, it is single
Position m；AsFor the service area of single aerator, unit m2；ρ0For the density of mixed liquor, units/kg/m3；G is acceleration of gravity,
Unit m/s2；
3) according to the aerated space pressure loss being calculated, the frictional-loss coefficient of aerator in aerated space is calculated in real time,
And the curve that frictional-loss coefficient changes over time is drawn, while recording and being shown on human-computer interaction interface in real time；Wherein, it hinders
The calculation formula of power loss coefficient is：
In formula, ξ is frictional-loss coefficient, dimensionless；V is flow velocity of the gas by aerator, unit m/s；QairFor branched pipe gas
Flow value, unit need to be scaled m3/s；N is the corresponding aerator quantity of branched pipe gas flow, unit pc；A is single aerator
Work area, unit m2/pc；ρ is the density of air, units/kg/m3, usual value is 1；
4) dynamic resistance of aerated space under current state is described according to the aerated space frictional-loss coefficient ξ being calculated in real time
Characteristic, more current frictional-loss coefficient and fuzzy evaluation grade obtain aerator obstruction and damaged degree, and need to adopt
The specific aim treatment measures taken；
5) according to the change curve of the aerated space frictional-loss coefficient ξ of historical record, analysis frictional-loss coefficient becomes at any time
The trend of change, judges whether aerator occurs damaged or obstruction, and the countermeasure of processing is provided according to judging result；
6) energy loss cost is calculated according to the aerated space pressure loss Δ P that is calculated in real time, and draw energy loss at
Originally the curve changed over time, while recording and being shown on human-computer interaction interface in real time；Wherein, the calculating of energy loss cost
Formula is：
In formula, M is energy loss cost, the i.e. electricity charge of aerator drag losses, identical element/d；A is electricity Unit Price, identical element/
kWh；η accounts for the ratio of institute's consuming electric power, unit % for air blower useful work；
7) curve is changed over time according to energy loss cost, analyzes and judge profit or loss of operation, judgement, which is taken cleaning and replaced, to expose
The necessity of gas device measure determines cleaning and replaces the operating time point of aerator.
2. sewage treatment plant's aerator as described in claim 1 blocks method for early warning, which is characterized in that branch pipe air-flow etc. is than adjusting
It saves in valve, aeration zone liquid level gauge, the number of branched pipe gas flowmeter and/or branch pipe stream pressure meter and sewage treatment plant and is aerated branch
The quantity of pipe and aerated space matches.
3. sewage treatment plant's aerator as described in claim 1 blocks method for early warning, which is characterized in that system controller uses
Programmable controller；Human-computer interaction interface uses touch screen.
4. sewage treatment plant's aerator as described in claims 1 or 2 or 3 blocks method for early warning, which is characterized in that the step
1) in, as the flow of inlet water Q that water inlet fluid flowmeter monitoring aerated space is not arrangedinOr aeration zone liquid level gauge monitoring is not set and is exposed
Gas water depth HLWhen, according to aerated space flow of inlet water QinWith aeration tank depth of water HLCorrelation, use existing monitoring data
Calculate the data not monitored directly；Aerated space flow of inlet water QinWith aeration tank depth of water HLBetween relational expression be：
In formula, h0For the aeration tank depth of water under hydrostatic condition, the i.e. distance of aeration tank distance from bottom liquid surface, unit m；QstTo set
Count the flow of inlet water under operating mode, unit m3/hr；hstFor design conditions flow of inlet water QstThe lower aeration tank depth of water, unit m.
5. sewage treatment plant's aerator as described in claims 1 or 2 or 3 blocks method for early warning, which is characterized in that the step
1) in, branched pipe gas flow Q is monitored when branched pipe gas flowmeter is not arrangedairOr branched pipe gas pressure gauge monitoring branch pipe is not set
Gas pressure P1When, according to branched pipe gas flow QairWith branched pipe gas pressure P1Correlation, use existing monitoring data meter
Calculate the data not monitored directly；Branched pipe gas flow QairWith branched pipe gas pressure P1Between relational expression be：
In formula, KV,mIt is branch pipe air-flow etc. than the discharge coefficient corresponding to regulating valve maximum opening, looking into product description can obtain, nothing
Dimension；R is the regulating ratio than regulating valve such as branch pipe air-flow, and looking into product description can obtain, dimensionless.
6. sewage treatment plant's aerator as described in claims 1 or 2 or 3 blocks method for early warning, which is characterized in that the step
4) the fuzzy evaluation grade of the frictional-loss coefficient in is damaged according to the history aerated space drag losses and resistance of bulk registration
Coefficient is lost, and is compared with history or other techniques, formation is used to assess the obstruction of aerator and breakage in aerated space
The index of situation judges the severity of aerator drag losses according to the numberical range of frictional-loss coefficient；Drag losses system
Several fuzzy evaluation grades specifically include：When frictional-loss coefficient fluctuation range is 107~5 × 108When, resistance levels are L grades
Not, drag losses degree is drag losses very little, and typical scenario is perforated pipe aerating regulation；When frictional-loss coefficient fluctuation range is 5
×108~109When, resistance levels are M ranks, and drag losses degree is that drag losses are larger, and typical scenario is film aeration, corundum
Disk；When frictional-loss coefficient fluctuation range is 109~5 × 109When, resistance levels are H ranks, and drag losses degree is damaged for resistance
It loses seriously, typical scenario is the sapphire discs being used for a long time；When frictional-loss coefficient fluctuation range is 5 × 109~1010When, resistance
Level is HH ranks, and drag losses degree is that drag losses are extremely serious, and typical scenario is that aeration pipeline muddy water silts up.
7. sewage treatment plant's aerator as described in claims 1 or 2 or 3 blocks method for early warning, which is characterized in that the step
5) curve is changed over time according to frictional-loss coefficient in and judges that the standard of aerator state and countermeasure specifically include：When curve becomes
When change type is random fluctuation, indicate that aerator normal operation, operating countermeasure are to maintain operation；When curvilinear motion type is unexpected
When decline, indicate that breakage occurs in aerator, operating countermeasure is to repair or replace aerator；When curvilinear motion type is on slow
When rising, indicate that aerator surface is blocked, operating countermeasure is to carry out regular medicament cleaning to aerator；When curvilinear motion class
When type is rapid increase, aeration pipeline Severe blockage has occurred in expression, and operating countermeasure is exclusion muddy water or replaces aerator.
8. sewage treatment plant's aerator as described in claims 1 or 2 or 3 blocks method for early warning, which is characterized in that the step
7) criterion in is：When energy loss cost and the difference of initial value are more than the cleaning cost of aerator, need to execute
Cleaning operation；When energy loss cost and the difference of initial value are more than aerator replacement cost, need to execute replacement operation.
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| CN110627143B (en) * | 2019-09-26 | 2022-04-05 | 哈尔滨工程大学 | Cleaning robot for aerator in sewage tank and state monitoring method |
| CN111982746B (en) * | 2020-07-16 | 2021-06-11 | 北京城市排水集团有限责任公司 | Aeration performance evaluation method of aeration device |
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