CN104731060B - A kind of sewage disposal energy-saving control method based on ternary three-dimensional table - Google Patents
A kind of sewage disposal energy-saving control method based on ternary three-dimensional table Download PDFInfo
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Abstract
The invention discloses a kind of sewage disposal energy-saving control method based on ternary three-dimensional table, for adjusting air blower output frequency according to wastewater influent flow, water inlet COD and water outlet COD change of error, including：The three-dimensional table using flow of inlet water Q, the water inlet COD P and water outlet COD deviation delta C gradually increased as ternary is set up, and as Q, P and Δ C increase or reduce, correspondence air blower theoretical work number of units n and the theoretical output frequency value of air blowerIncrease or decrease；Periodically intercept current flow of inlet water Q ', water inlet COD P ' and water outlet COD C；Δ C is calculated according to C and chemical oxygen demand of water body emission compliance value；According to Q ', P ' and Δ C three-dimensional table be positioned to current n withAnd then air blower real work number of units n ' and output frequency are adjusted in real time.The present invention can intelligent control blower frequency and number of units, it is to avoid the too small sewage disposal of blower frequency is not enough or the excessive wasting of resources.
Description
Technical Field
The invention relates to an energy-saving control method used in the sewage treatment condition. More particularly, the invention relates to a sewage treatment energy-saving control method based on a three-variable three-dimensional table for sewage treatment.
Background
The high energy consumption of urban sewage treatment causes high operation cost of sewage treatment facilities on one hand, and also aggravates energy crisis and environmental pollution at the present stage of China on the other hand. With the increasing number of sewage treatment plants, the energy consumption of the sewage treatment plants is more and more concerned by people. The sewage treatment plant must research various new energy-saving and consumption-reducing technologies, so as to achieve the purposes of reducing the sewage treatment cost and improving the economic benefit and the environmental benefit.
In the operation cost of a conventional urban sewage treatment plant, the electricity charge accounts for more than half of the cost, wherein the electricity consumption of an air blower accounts for 60-70% of the electricity consumption of the sewage treatment plant. The implementation of energy conservation and consumption reduction has important significance for reducing the operation cost of sewage plants and relieving the current energy shortage, and therefore, the air blower needs to be controlled and adjusted to adapt to the operation condition. At present, part of blowers work at fixed power frequency without any energy-saving measure; the air quantity of the partial air blowers is adjusted by the power frequency throttle valve and the air inlet valve and the air outlet valve, so that a large amount of electric energy is consumed on the baffle plate, and the air blowers have the advantages of high energy consumption, low operation efficiency and more negative effects. The variable frequency speed regulation technology can realize stepless speed regulation, has simple structure, stable start, reliable performance and obvious energy saving, and can achieve the aims of saving energy and reducing consumption and operating cost. However, most of the existing methods for realizing energy saving by adopting a mathematical model or an intelligent algorithm to carry out frequency conversion adjustment are more theoretical, and can generate a plurality of practical problems in the practical process of engineering application, such as surge of a fan, high requirement on instrument detection precision, long lag time, complex operation and the like, thereby influencing the use of the method in engineering. And the regulation by adopting control algorithms such as PID and the like can not adapt to the characteristic of complex biochemical reaction in the sewage treatment process, so that the effluent quality fluctuation is large.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
The invention also aims to provide a method for establishing a three-variable three-dimensional table, which can establish the three-variable three-dimensional table by taking the inflow Q, the inflow water body chemical oxygen demand P and the outflow water chemical oxygen demand deviation Delta C as three variables, realize the accurate control of sewage drainage, play the efficient and energy-saving effect in engineering and solve the problem that the existing theoretical method is difficult to be practically applied.
The invention also aims to provide a sewage treatment energy-saving control method based on a three-variable three-dimensional table, which realizes closed-loop feedback control, can better ensure the effluent quality, fully considers the fluctuation of water conditions and processes, and realizes energy conservation and consumption reduction on the premise of ensuring the effluent quality.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a sewage treatment energy-saving control method based on a three-variable three-dimensional table for reasonably adjusting the output frequency of a blower according to the variation of sewage flow, chemical oxygen demand of sewage inlet water body and chemical oxygen demand deviation of outlet water body comprises the following steps:
1) establishing a three-dimensional table n with three variables of respectively gradually increased inflow Q, inflow water body chemical oxygen demand P and outflow water chemical oxygen demand deviation Delta C, wherein
Gradually increasing or decreasing the inlet water flow Q, the chemical oxygen demand P of the inlet water body and the chemical oxygen demand deviation Delta C of the outlet water body, and gradually increasing or decreasing the theoretical working number n of the corresponding air blower;
the theoretical output frequency value of the corresponding blower is gradually increased or decreased along with the gradual increase or decrease of the inflow Q, the chemical oxygen demand P of the inflow water body and the chemical oxygen demand deviation Delta C of the outflow water bodyIs driven by a motorGradually increase or decrease;
2) periodically and simultaneously intercepting the current inflow Q ', the current water inflow chemical oxygen demand P' and the effluent chemical oxygen demand C;
3) according to the intercepted chemical oxygen demand C of the current effluent and a set value C0Calculating the chemical oxygen demand deviation value delta C of the current effluent water body by the difference value, wherein the set value C0Discharging the chemical oxygen demand of the water body to reach a standard value; wherein, C0The method is manually set according to the discharge standard of pollutants for municipal wastewater treatment plants (GB 18918-2002);
4) performing cross positioning in the three-dimensional table n according to the intercepted current inflow Q 'and the intercepted current chemical oxygen demand P' of the inflow water body to obtain the current theoretical working number n of the blower;
5) carrying out three-dimensional positioning in the three-dimensional table n according to the current water inlet flow Q ', the current water inlet water body chemical oxygen demand P' and the water outlet water body chemical oxygen demand deviation value delta C to obtain a theoretical output frequency value of the air blower
6) According to the obtained current theoretical working number n of the blowers and the theoretical output frequency value of the blowersThe actual number n' of the working stations and the output frequency of the blower are adjusted in real time.
Preferably, wherein the theoretical output frequency value of the blower is obtained from a three-dimensional table n when the actual number of operating blowers n' is 1In the method, the actual working frequency of the blower is forced to be 0.6f, and the theoretical working number n of the blower is 1, wherein f is the maximum frequency value of the blower.
Preferably, wherein the theoretical output frequency value of the blower is obtained according to a three-dimensional table when the actual number n' ≧ 2 of the blowersAnd (3) when the theoretical number n of the blowers is n' -1, adjusting the actual number of the blowers to reduce the number of the blowers in the original working state by 1, and then repeating the steps 2) to 6), wherein f is the maximum frequency value of the blowers.
Preferably, wherein the theoretical output frequency value of the blower is obtained according to a three-dimensional table when the actual number n' ≧ 1 of the blowersAdjusting the actual working frequency of the blower to the theoretical output frequency value of the blowerThe theoretical number n of the working units of the blower is n';
when the actual number n' of the working blowers is more than or equal to 1, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableAnd when the fan is in the working state, the actual working frequency of the fan enforces f, and the theoretical working number n of the fan is equal to n', wherein f is the maximum frequency value of the fan.
Preferably, the theoretical output frequency value of the blower is obtained according to a three-dimensional table when the number n' ≧ 1 of actually-operated blowersWhen the frequency is larger than 1.1 times of the maximum frequency f of the blower, the theoretical working number n of the blower is n' +1, the actual working number of the blower is adjusted to increase by 1 on the number of the blowers in the original working state, wherein f is the maximum frequency of the blower.
Preferably, the method comprises the steps of positioning in a three-dimensional table n according to the deviation delta C between the actual number n ' of the working tables of the blower and the chemical oxygen demand of the water outlet body, substituting the intercepted current chemical oxygen demand P ' of the water inlet body into the three-dimensional table n, and bringing the maximum value P of the P ' and the three-dimensional table nnmaxMaking a comparison if P' > PnmaxAdjusting the actual number of the blowers to increase 1 blower on the original number of the blowers in the working state, wherein the specific method for positioning is that n' ═ n,wherein Δ C0Is a manual setting value.
Preferably, the positioning is carried out in a three-dimensional table n according to the deviation delta C between the actual number n ' of the working tables of the blower and the chemical oxygen demand of the effluent water body, the current intercepted inflow rate Q ' is brought into the three-dimensional table n, and the maximum value Q between Q ' and the three-dimensional table n is setnmaxMaking a comparison if Q' > QnmaxAdjusting the actual number of the blowers to increase 1 blower on the original number of the blowers in the working state, wherein the specific method for positioning is that n' ═ n,wherein Δ C0Is a manual setting value.
Preferably, when the number n 'of actually-operated blowers is more than or equal to 2, the positioning is carried out in the three-dimensional table n according to the deviation delta C between the actual number n' of the blowers and the chemical oxygen demand of the effluent water body, the intercepted current inflow rate Q 'is brought into the three-dimensional table n, and the Q' and the maximum value Q of the three-dimensional table n are set(n-1)maxMaking a comparison if Q' < Q(n-1)maxThe number of the blowers is adjusted to be 1 less than the number of the blowers in the original working state, wherein the positioning method is n' ═ n,wherein Δ C0Is a manual setting value.
Preferably, wherein the theoretical output frequency value of the blower isThe algorithm is used for obtaining the following specific values:
wherein:corresponding blower frequency values of the ith row and the jth column in the three-dimensional table n sub-table l; f. ofnFor the fundamental frequency, f, in the three-dimensional table nn＝0.6f；Actually increasing the step length of the blower frequency in the three-dimensional table n; thetaij(n)Increasing the coefficient for the step size; Δ fnBase step increment for three-dimensional table (n); n' and N represent the total number of rows and columns in the three-dimensional table N-1,wherein Δ C0Is artificially set to [ i + j- (N' + N)/2%]The step number of i rows and j columns in the three-dimensional table N from the basic frequency in the three-dimensional table N is shown, namely, a plurality of step sizes are added to the basic frequency, and the three-dimensional table 1 is provided with (N' + N)/2 as 1; k is an instrument coefficient, and the instrument parameter is 0.9-1.1; the three-dimensional table n is a part corresponding to the condition that the theoretical number of the corresponding blowers in the three-dimensional table is n; the three-dimensional table n-1 is a part corresponding to the theoretical number of the blowers in the three-dimensional table n-1.
Preferably, when the maximum frequency value f of the blower is 50Hz, the single blower can bear the inflow Q of 0-1600 t/h, and the chemical oxygen demand P of the inflow water body is 0-400 mg/L.
The invention at least comprises the following beneficial effects:
1. the chemical oxygen demand deviation of the effluent water body is taken as one of control input quantities, closed-loop feedback control is realized, and the effluent water quality can be better ensured than open-loop control;
2. the optimal frequency of the operation of the blower is determined according to the water quality conditions of inlet and outlet, and the energy conservation and consumption reduction are realized on the premise of ensuring the water quality of outlet water;
3. the design of the three-dimensional table fully considers the fluctuation of the water condition and the process, avoids the repeated adjustment of the frequency of the blower which is easily caused when the set value is a single value, and further ensures that the whole control system is more reasonable;
4. the frequency of the blower can be flexibly controlled according to the deviation of the water inlet amount, the chemical oxygen demand of the inlet water and the chemical oxygen demand of the outlet water body, and the problem that the frequency of the blower cannot make optimal strain in time along with the actual dynamic change of the inlet water is solved;
5. the high-efficiency energy-saving effect can be exerted in engineering, and the problem that the existing theoretical method is difficult to be practically applied is solved;
6. each parameter is adjustable, the operation is flexible, and the problems of dead plate and machinery in operation of some processes are solved;
7. the operation is simple, and the regulation and control precision is high.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic flow chart of an energy-saving control method for sewage treatment based on a three-variable three-dimensional table according to an embodiment of the present invention;
FIG. 2 illustrates a block diagram of the overall control of the present invention;
FIG. 3 is a schematic structural diagram of a control system used in the sewage treatment energy-saving control method of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
Fig. 1 shows an implementation form of the invention, and shows a sewage treatment energy-saving control method based on a three-variable three-dimensional table. Which comprises the following steps:
1) establishing a three-dimensional table n with three variables of respectively gradually increased inflow Q, inflow water body chemical oxygen demand P and outflow water chemical oxygen demand deviation Delta C, wherein
Gradually increasing or decreasing the inlet water flow Q, the chemical oxygen demand P of the inlet water body and the chemical oxygen demand deviation Delta C of the outlet water body, and gradually increasing or decreasing the theoretical working number n of the corresponding air blower;
the theoretical output frequency value of the corresponding blower is gradually increased or decreased along with the gradual increase or decrease of the inflow Q, the chemical oxygen demand P of the inflow water body and the chemical oxygen demand deviation Delta C of the outflow water bodyGradually increasing or decreasing;
2) periodically and simultaneously intercepting the current inflow Q ', the current water inflow chemical oxygen demand P' and the effluent chemical oxygen demand C;
3) according to the intercepted chemical oxygen demand C of the current effluent and a set value C0Calculating the chemical oxygen demand of the current water bodyDeviation value Δ C, wherein the set value C0Discharging the chemical oxygen demand of the water body to reach a standard value; wherein, C0The method is manually set according to the discharge standard of pollutants for municipal wastewater treatment plants (GB 18918-2002);
4) performing cross positioning in the three-dimensional table n according to the intercepted current inflow Q 'and the intercepted current chemical oxygen demand P' of the inflow water body to obtain the current theoretical working number n of the blower;
5) carrying out three-dimensional positioning in the three-dimensional table n according to the current water inlet flow Q ', the current water inlet water body chemical oxygen demand P' and the water outlet water body chemical oxygen demand deviation value delta C to obtain a theoretical output frequency value of the air blower
6) According to the obtained current theoretical working number n of the blowers and the theoretical output frequency value of the blowersThe actual number n' of the working stations and the output frequency of the blower are adjusted in real time.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: when the actual number n' of the working tables of the blower is 1, and the theoretical output frequency value of the blower is obtained according to the three-dimensional table nIn the method, the actual working frequency of the blower is forced to be 0.6f, and the theoretical working number n of the blower is 1, wherein f is the maximum frequency value of the blower.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: when the actual number n' of the working blowers is more than or equal to 2, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableAnd (3) when the theoretical number n of the blowers is n' -1, adjusting the actual number of the blowers to reduce the number of the blowers in the original working state by 1, and then repeating the steps 2) to 6), wherein f is the maximum frequency value of the blowers.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: when the actual number n' of the working blowers is more than or equal to 1, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableAdjusting the actual working frequency of the blower to the theoretical output frequency value of the blowerThe theoretical number n of the working units of the blower is n';
when the actual number n' of the working blowers is more than or equal to 1, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableAnd when the fan is in the working state, the actual working frequency of the fan enforces f, and the theoretical working number n of the fan is equal to n', wherein f is the maximum frequency value of the fan.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: when the number n' of actually working blowers is more than or equal to 1, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableWhen the frequency is larger than 1.1 times of the maximum frequency f of the blower, the theoretical working number n of the blower is n' +1, the actual working number of the blower is adjusted to increase by 1 on the number of the blowers in the original working state, wherein f is the maximum frequency of the blower.
As described aboveOne implementation mode of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: positioning in a three-dimensional table n according to the actual number n ' of working tables of the blower and the deviation delta C of the chemical oxygen demand of the water outlet body, substituting the intercepted current chemical oxygen demand P ' of the water inlet body into the three-dimensional table n, and taking the maximum value P of the P ' and the three-dimensional table nnmaxMaking a comparison if P' > PnmaxAdjusting the actual number of the blowers to increase 1 blower on the original number of the blowers in the working state, wherein the specific method for positioning is that n' ═ n,wherein Δ C0Is a manual setting value.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: positioning in a three-dimensional table n according to the actual number n ' of working tables of the blower and the deviation delta C of the chemical oxygen demand of the water body of the outlet water, bringing the intercepted current inflow rate Q ' into the three-dimensional table n, and taking the Q ' and the maximum value Q of the three-dimensional table nnmaxMaking a comparison if Q' > QnmaxAdjusting the actual number of the blowers to increase 1 blower on the original number of the blowers in the working state, wherein the specific method for positioning is that n' ═ n,wherein Δ C0Is a manual setting value.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: when the number n 'of actually working blowers is more than or equal to 2, positioning in a three-dimensional table n according to the actual number n' of the working blowers and the deviation delta C of the chemical oxygen demand of the effluent water body, bringing the intercepted current inflow Q 'into the three-dimensional table n, and bringing the Q' and the maximum value Q of the three-dimensional table n(n-1)maxMaking a comparison if Q' < Q(n-1)maxThe number of the blowers is adjusted to be 1 less than the number of the blowers in the original working state, wherein the positioning method is n' ═ n,wherein Δ C0Is a manual setting value.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: theoretical output frequency value of the blowerThe algorithm is used for obtaining the following specific values:
wherein:corresponding blower frequency values of the ith row and the jth column in the three-dimensional table n sub-table l; f. ofnIs the fundamental frequency in the three-dimensional table n; f. ofn＝0.6f；Actually increasing the step length of the blower frequency in the three-dimensional table n; thetaij(n)Increasing the coefficient for the step size; Δ fnBase step increment for three-dimensional table (n); n' and N represent the total number of rows and columns in the three-dimensional table N-1,ΔC0is artificially set to [ i + j- (N' + N)/2%]The step number of i rows and j columns in the three-dimensional table N from the basic frequency in the three-dimensional table N is shown, namely, a plurality of step sizes are added to the basic frequency, and the three-dimensional table 1 is provided with (N' + N)/2 as 1; k isThe instrument coefficient is 0.9-1.1; the three-dimensional table n is a part corresponding to the condition that the theoretical number of the corresponding blowers in the three-dimensional table is n; the three-dimensional table n-1 is a part corresponding to the theoretical number of the blowers in the three-dimensional table n-1.
One implementation manner of the sewage treatment energy-saving control method based on the three-variable three-dimensional table in the scheme is as follows: when the maximum frequency value f of the air blower is 50Hz, the water inflow rate Q of a single air blower is 0-1600 t/h, and the chemical oxygen demand P of the water inflow body is 0-400 mg/L.
Wherein the l distribution is adjustable
The COD set value of the effluent is C0L is assigned as shown in the table, wherein C0And the delta C can be adjusted individually according to the actual conditions of the water plant. As shown in table 1.
TABLE 1 l Allocation
Wherein, the deviation Delta C of the chemical oxygen demand of the effluent water body is C-C0，1 is an integer of the ratio.
< example 1>
The maximum frequency of the blower is 50Hz, 5 ten thousand tons of sewage treatment plants and the actual working number of the blower is 2 are taken as examples.
The specific process of specifically adjusting the frequency or the number of the blowers is as follows:
1. establishing a three-dimensional table 2-sub-table 2 (shown in table 2) with three variables of respectively and gradually increased inflow Q, inflow water body chemical oxygen demand P and outflow water chemical oxygen demand deviation Delta C in the upper computer, wherein Delta C is 2 Delta C01-2, wherein, the water inflow rate Q, the chemical oxygen demand P of the water inflow body and the water outflow are carried outThe deviation delta C of the chemical oxygen demand of the water body is gradually increased or decreased, and the theoretical working number n of the corresponding air blower is gradually increased or decreased; the theoretical output frequency value of the corresponding blower is gradually increased or decreased along with the gradual increase or decrease of the inflow Q, the chemical oxygen demand P of the inflow water body and the chemical oxygen demand deviation Delta C of the outflow water bodyGradually increasing or decreasing;
2. inputting the number 2 of blowers in the current working state into an upper computer, automatically adjusting the upper computer to a three-variable three-dimensional table 2-sub-table 2, acquiring the current inflow Q 'and the current water body COD P' which are periodically and simultaneously intercepted by an inflow flowmeter, an inflow COD detector and an outflow COD detector and the outflow COD C under the current frequency through the current two blowers by an intelligent controller, and according to the intercepted current outflow COD C and a set value C0Calculating the current chemical oxygen demand deviation value delta C of the effluent water body, as shown in Table 2, wherein delta C is 2 delta C0，1＝2；
Uploading the current water inflow rate Q 'and the current water inflow body chemical oxygen demand P' acquired and uploaded by the intelligent controller to an upper computer, performing cross positioning on a three-variable three-dimensional table 2-a sub-table 2 by the upper computer according to the current water inflow rate Q 'and the current water inflow body chemical oxygen demand P' to obtain the current theoretical working number n of the air blower, and performing three-dimensional positioning on the three-dimensional table n according to the current water inflow rate Q ', the current water inflow body chemical oxygen demand P' and the deviation value delta C of the water outflow body chemical oxygen demand to obtain the theoretical output frequency value of the air blowerAccording to the obtained current theoretical working number n of the blowers and the theoretical output frequency value of the blowersThe real-time adjustment of the number n' of the actual working stations and the output frequency of the blower comprises the following conditions:
firstly, respectively comparing the current water body chemical oxygen demand P 'and the current inflow Q' with P in a three-dimensional table 2-a sub-table 22maxAnd Q2maxAnd (3) comparison:
(1) the intercepted current water body chemical oxygen demand P 'is put into a three-dimensional table 2-a sub-table 2, and the maximum value P of the P' and the three-dimensional table 2 is2maxMaking a comparison if P' > P2maxThe starting and stopping controller adjusts the actual working number of the blowers to increase 1 blower in the original working state;
(2) the intercepted current inflow rate Q 'is substituted into a three-dimensional table 2-a sub-table 2, and the Q' and the maximum value Q of the three-dimensional table 22maxMaking a comparison if Q' > Q2maxThe starting and stopping controller adjusts the actual working number of the blowers to increase 1 blower in the original working state;
(3) the intercepted current inflow rate Q 'is substituted into a three-dimensional table 2-a sub-table 2, and Q' and the maximum value Q of the three-dimensional table 1 are substituted1maxMaking a comparison if Q' < Q2maxThe starting and stopping controller adjusts the actual working number of the blowers to reduce by 1 in the original working state;
if P' > P is satisfied at the same time2maxAnd Q1max≤Q′＜Q2maxThen, the theoretical output frequency value of the blower is calculated according to the three-variable three-dimensional table 2And the theoretical working number n of the blower is divided into the following conditions:
a. if the theoretical output frequency value of the blower is obtained according to the three-variable three-dimensional table 2-sub table 2 The number of the actual working tables of the blowers adjusted by the start-stop controller is reduced by 1 in the number of the blowers in the original working state.
b. Obtaining the theoretical output frequency value of the blower according to a three-variable three-dimensional table 2-sub table 2 When the intelligent controller controls the frequency converter in the blower to adjust the actual working frequency of the blower to the theoretical output frequency value of the blowerThe theoretical number of blowers is 2.
c. Obtaining the theoretical output frequency value of the blower according to the three-variable three-dimensional table 2-sub table 2 When the intelligent controller controls a frequency converter in the blower to force the blower to execute 50Hz of actual working frequency, wherein the theoretical working number of the blower is 2;
d. obtaining the theoretical output frequency value of the blower according to the three-variable three-dimensional table 2-sub table 2And in the process, the starting and stopping controller adjusts the actual working number of the blowers to increase 1 blower in the original working state.
TABLE 25 Van ton sewage treatment plant-blower frequency conversion speed regulation three-dimensional TABLE 2-TABLE 2
1: after the "/" slash line indicates the actual frequency of operation of the blower, when the drum is calculatedWhen the frequency of the fan is more than 50Hz and less than 55Hz, the fan operates at 50Hz, namely, a single fan operates at the maximum frequency.
2: the "/" slash indicates the actual frequency at which the blower should be operated, and when the calculated blower frequency is greater than 55Hz, one blower is forced to be turned on, with each blower operating at 30 Hz.
< example 2>
Take the maximum frequency of the blower as 50Hz and the actual number of blowers as n as an example.
The specific process of specifically adjusting the frequency or the number of the blowers is as follows:
1. establishing a three-dimensional table n (shown in table 7) with three variables of respectively gradually increased inflow Q, inflow water body chemical oxygen demand P and outflow water body chemical oxygen demand deviation Delta C, wherein as the inflow Q, the inflow water body chemical oxygen demand P and the outflow water body chemical oxygen demand deviation Delta C are gradually increased or decreased, the number n of theoretical working tables corresponding to the blower is gradually increased or decreased, and the number n of theoretical working tables corresponding to the blower is gradually increased or decreased; the theoretical output frequency value of the corresponding blower is gradually increased or decreased along with the gradual increase or decrease of the inflow Q, the chemical oxygen demand P of the inflow water body and the chemical oxygen demand deviation Delta C of the outflow water bodyGradually increasing or decreasing;
2. inputting the number n of blowers in the current working state into an upper computer, automatically adjusting the upper computer to a three-variable three-dimensional meter n, collecting the current inflow Q 'and the current water body COD P' which are periodically and simultaneously intercepted by an inflow flowmeter, an inflow COD detector and an outflow COD detector, and the outflow COD C passing through the current two blowers and under the current frequency by an intelligent controller, and according to the intercepted current outflow COD C and a set value C0Calculating the chemical oxygen demand deviation value delta C of the current effluent water body by the difference value, wherein different n values correspond to different three-dimensional valuesTables 3 to 6 correspond to different three-dimensional tables and three-dimensional table sub-tables corresponding to different n and 1 respectively; wherein, C0The method is manually set according to the discharge standard of pollutants for municipal wastewater treatment plants (GB 18918-2002);
and uploading the current water inflow rate Q 'and the current water inflow body chemical oxygen demand P' acquired and uploaded by the intelligent controller to an upper computer, performing cross positioning on a three-variable three-dimensional table 2 by the upper computer according to the current water inflow rate Q 'and the current water inflow body chemical oxygen demand P' acquired and uploaded by the intelligent controller to obtain the current theoretical working number n of the blower, and performing three-dimensional positioning on the three-dimensional table n according to the theoretical working number n of the blower and the deviation value delta C of the water outflow body chemical oxygen demand to obtain the theoretical output frequency value of the blowerAccording to the obtained current theoretical working number n of the blower and the theoretical output frequency value of the blowerThe real-time adjustment of the number n' of the actual working stations and the output frequency of the blower comprises the following conditions:
firstly, respectively comparing the current water body chemical oxygen demand P 'and the current inflow Q' with P in a three-dimensional table nnmaxAnd QnmaxAnd (3) comparison:
(1) the intercepted current water body chemical oxygen demand P 'is brought into a three-dimensional table n, and the maximum value P of the P' and the three-dimensional table nnmaxMaking a comparison if P' > PnmaxThe starting and stopping controller adjusts the actual working number of the blowers to increase 1 blower in the original working state;
(2) the intercepted current inflow rate Q 'is substituted into a three-dimensional table n, and the maximum value Q of Q' and the three-dimensional table nnmaxMaking a comparison if Q' > QnmaxThe starting and stopping controller adjusts the actual working number of the blowers to increase 1 blower in the original working state;
(3) the intercepted current inflow rate Q' is brought into three dimensionsIn Table n, Q' is compared with the maximum value Q of the three-dimensional table n-1(n-1)maxMaking a comparison if Q' < Q(n-1)maxThe starting and stopping controller adjusts the actual working number of the blowers to reduce by 1 in the original working state;
if P' > P is satisfied at the same timenmaxAnd Q(n-1)max≤Q′＜QnmaxThen, the theoretical output frequency value of the blower is calculated according to the three-variable three-dimensional table nAnd the theoretical working number n of the blower is divided into the following conditions:
a. if the theoretical output frequency value of the air blower is obtained according to the three-variable three-dimensional table nThe number of the actual working tables of the blowers adjusted by the start-stop controller is reduced by 1 in the number of the blowers in the original working state.
b. Obtaining the theoretical output frequency value of the blower according to a three-variable three-dimensional table nWhen the intelligent controller controls the frequency converter in the blower to adjust the actual working frequency of the blower to the theoretical output frequency value of the blowerThe theoretical number of blowers is n.
c. Obtaining the theoretical output frequency value of the blower according to the three-variable three-dimensional table nWhen the intelligent controller controls a frequency converter in the blower to force the blower to execute an actual working frequency of 50Hz, wherein the theoretical working number of the blower is n;
d. obtaining theoretical output frequency of the blower according to the three-variable three-dimensional table nValue of rateAnd in the process, the starting and stopping controller adjusts the actual working number of the blowers to increase 1 blower in the original working state.
TABLE 3 three-dimensional tables 1-TABLE 1
TABLE 4 three-dimensional TABLE 1-TABLE-1
TABLE 5 three-dimensional tables 1-sub-tables l
TABLE 6 three-dimensional Table 2-sub-Table l
TABLE 7 three-dimensional table n-sub-table l
As shown in figure 2, the overall control structure diagram of the sewage treatment energy-saving control method based on the three-variable three-dimensional table is shown,
obtaining a three-variable three-dimensional table based on an expert knowledge base according to actual operation experience to form a three-variable three-dimensional table closed-loop system for controlling the frequency of the blower by the inflow water flow, the inflow chemical oxygen demand and the outflow chemical oxygen demand; secondly, acquiring sewage inflow flow and inflow COD content by using a sewage inflow flowmeter and an inflow COD detector, acquiring effluent COD by using an effluent COD detector, and calculating deviation between an actual measured value of the water COD and a set value; then, the variable-frequency speed regulation control of the blower is completed through an intelligent control algorithm program of the programmable controller, so that the aim of energy-saving control in the sewage treatment process is fulfilled, and the effluent quality can be better ensured compared with open-loop control.
FIG. 3 shows an energy-saving control system of the sewage treatment energy-saving control method based on the three-variable three-dimensional table, comprising:
a reaction tank;
the water inlet flow meter is used for detecting the current water inlet flow Q' of the reaction tank;
the water inlet chemical oxygen demand detector is used for detecting the current water body chemical oxygen demand P' of the inlet water in the reaction tank;
the effluent chemical oxygen demand detector is used for detecting the current water chemical oxygen demand C of the effluent in the reaction tank;
the intelligent controller is electrically connected with the water inlet flow meter, the water inlet chemical oxygen demand detector and the water outlet chemical oxygen demand detector, and is used for acquiring the current water inlet flow Q ', the current water body chemical oxygen demand P' and the current water body chemical oxygen demand C of the outlet water detected by the corresponding devices;
the air blower is connected with an air diffusion device through a pipeline, and the air diffusion device is arranged in the reaction tank;
the start-stop controller is electrically connected with the blower and the intelligent controller and is used for controlling the start-stop of the blower;
the upper computer is electrically connected with the intelligent controller and is used for establishing a three-dimensional table n with three variables of respectively gradually increased inflow Q, inflow water body chemical oxygen demand P and outflow water chemical oxygen demand deviation delta C, wherein, in addition, the three-dimensional table n has
Gradually increasing or decreasing the inlet water flow Q, the inlet water body chemical oxygen demand P and the outlet water body chemical oxygen demand deviation delta C, gradually increasing or decreasing the theoretical working number n of the corresponding air blower, and gradually increasing or decreasing the theoretical working number n of the corresponding air blower;
the theoretical output frequency value of the corresponding blower is gradually increased or decreased along with the gradual increase or decrease of the inflow Q, the chemical oxygen demand P of the inflow water body and the chemical oxygen demand deviation Delta C of the outflow water bodyGradually increasing or decreasing;
the upper computer carries out cross positioning in a three-variable three-dimensional table according to the current inflow Q 'and the current water body chemical oxygen demand P' acquired and uploaded by the intelligent controller to obtain the current theoretical working number n of the blower, and carries out three-dimensional positioning in the three-dimensional table according to the theoretical working number n of the blower and the deviation value delta C of the water body chemical oxygen demand of the outlet water to obtain the theoretical output frequency value of the blowerBy theoretical output frequency value of said blowerComparing the actual output frequency value f of the blower and sending an instruction for adjusting the actual output frequency of the blower to the intelligent controller; and comparing the output frequency of the blower with the actual working number n' according to the theoretical working number n of the blower, and sending an instruction of the opening and closing number of the blower to the intelligent controller.
The energy-saving control system of the invention aims at the dynamic change of water inlet of a sewage plant, dynamic data information is collected through each index detection instrument and is input into an upper monitoring system through an intelligent controller, the upper monitoring system processes and analyzes the information, the proper running frequency of a corresponding blower is calculated, the frequency of the blower is output through the intelligent controller, and meanwhile, the upper monitoring system controls and inputs signals into equipment through the intelligent controller so as to control the on-off of the equipment (the blower).
The intelligent control process of the sewage treatment energy-saving control device based on the three-variable three-dimensional table comprises the following steps: firstly, each index detection instrument inputs information such as water inlet flow, water inlet COD (chemical oxygen demand) and water outlet COD (chemical oxygen demand) into an upper monitoring system through an intelligent controller, and a three-variable three-dimensional meter in a decision support system operated by the upper monitoring system calculates a frequency value of a blowerAnd the frequency output of the blower is controlled by the frequency output of the blower to execute an upper monitoring system instruction, and the operation on-off state of the blower is controlled by the on-off controller of the blower.
The specific operation process comprises the following steps:
(1) the method comprises the steps that water inlet flow, water inlet COD and water outlet COD are obtained through all index detection instruments, data are input into an upper monitoring system through an intelligent controller, the intelligent controller completes conversion and transmission of signals, on one hand, input data of all the index detection instruments, running states and frequency of a blower are received, and collected information is input into the upper monitoring system; and on the other hand, the system receives signals of an upper monitoring system and controls the state and frequency output of the blower.
(2) The upper monitoring system receives an input signal of the intelligent controller, calculates the proper frequency of the blower through the core three-variable three-dimensional table, and inputs the result into the intelligent controller;
(3) the intelligent controller outputs signals to the blower frequency output and blower start-stop controller according to the instruction of the upper monitoring system;
(4) the blower outputs according to the blower frequency, and the blower frequency is executed; and controlling the on-off of the air blower according to the on-off controller of the air blower.
To realize the purpose on the premise of effluent of a sewage plant reaching standardsThe invention provides a sewage treatment energy-saving control engineering method based on a three-variable three-dimensional table, aiming at the problems of an air blower. The invention can play a role in high efficiency and energy saving in engineering, and solves the problem that the prior theoretical method is difficult to be practically applied; each parameter is adjustable, the operation is flexible, and the problems of dead plate, machinery and the like in operation of some processes are solved. The invention takes the interval numerical values of the water inlet flow, the water inlet COD value and the water outlet COD deviation as input, controls the frequency of the blower through the operation result of the three-dimensional table, and then automatically keeps the water outlet COD of the sewage plant in the set interval. Specifically, the inflow water flow Q, the inflow water chemical oxygen demand P and the outflow water COD deviation delta C are used as control input quantities, and the running frequency of the blower is calculated according to a three-variable three-dimensional table operation unit based on an expert knowledge baseAnd the frequency of the blower is changed to ensure that the COD value of the discharged water is kept within a set normal range.
Firstly, obtaining a three-variable three-dimensional table based on an expert knowledge base according to actual operation experience to form a three-variable three-dimensional table closed-loop system for controlling the frequency of a blower by the deviation of water inlet flow, water inlet COD and water outlet COD; secondly, acquiring the sewage inflow flow and the inflow COD content by using a sewage inflow flowmeter and an inflow COD detector, acquiring the effluent COD by using an effluent COD detector, and calculating the deviation of an actual measured value of the effluent COD and a set value; then, the variable frequency speed regulation control of the blower is completed through an intelligent control algorithm program of the programmable controller, so that the aim of energy-saving control in the sewage treatment process is fulfilled.
The three-dimensional table is in a nested mode, the three-dimensional table 1 is preferably selected when a water plant has a common blower, and the three-dimensional table 2 is automatically executed when the flow or COD (chemical oxygen demand) exceeds the maximum limit value in the three-dimensional table 1; when two common blowers exist, the three-dimensional table 2 is preferentially selected, and when the flow or COD exceeds the maximum limit value of the three-dimensional table 2, the three-dimensional table 3 is automatically executed; and so on.
(1) Establishment of three-variable three-dimensional table
Establishing a three-dimensional table of water inlet flow (Q), water inlet COD (chemical oxygen demand) (P), water outlet COD deviation (delta C) and blower frequency (f) in a database, wherein each pair of water inlet flow, water inlet COD and water outlet COD deviation (Q)i，Pj，ΔC1) Corresponding to a corresponding blower frequencyBlast frequencyThere are two main input modes.
1) Manual input
According to the actual operation experience of the sewage treatment plant, the sewage treatment plant is manually inputAnd (4) carrying out variable frequency adjustment on the running blower.
2) Algorithm input
The sewage treatment plant can control the variable frequency speed regulation of the blower according to the calculation result of the three-variable three-dimensional table based on the expert knowledge base. Meanwhile, each sewage treatment plant can set and adjust parameters in the three-dimensional table according to actual operation conditions so as to achieve the aims of high efficiency, energy conservation and consumption reduction. The blower frequency calculation formula is as follows:
wherein:corresponding blower frequency values of the ith row and the jth column in the sub-table l of the three-dimensional table (n); f. ofnIs the fundamental frequency in the three-dimensional table (n);actually increasing step length for the blower frequency in the three-dimensional table (n); thetaij(n)Increasing the coefficient for the step size; Δ fnBase step increment for three-dimensional table (n); n' and N represent the total number of rows and columns in the three-dimensional table (N-1); [ i + j- (N' + N)/2]The step number of i rows and j columns in the three-dimensional table (N) from the basic frequency in the three-dimensional table (N) is represented, namely, the step number is increased by a plurality of steps on the basic frequency, and the three-dimensional table (1) is provided with (N' + N)/2 as 1; k is an instrument coefficient, namely a blower running condition coefficient, and if the blower runs well, 0.9 is taken, and if the blower runs normally, 1.0 is taken.
(2) Selection of blower frequency
Establishing a three-dimensional table of inflow (Q), inflow COD (chemical oxygen demand) (P), outflow COD deviation (delta C) and blower frequency (f) in a database, comparing the application range of the three-dimensional table according to the inflow flow of sewage and the inflow COD content measured by an inflow COD detector of a sewage treatment plant, and selecting a proper three-dimensional table and a proper blower frequency (see tables 2-7).
(3) Parameter setting
1)1 distributing the adjustable water COD set value as a range value (C)0，C′0) And 1 value assignment as shown in Table 1, where C0，C′0，ΔC0Can be adjusted individually according to the actual conditions of the water plant. The three-dimensional table has a plurality of adjustable parameters which can be set and adjusted according to the actual conditions of the sewage treatment plant, so that the three-dimensional table can flexibly adapt to various operating conditions, and the engineering effect is obvious.
2) The COD interval is adjustable: the COD gradient can be automatically adjusted by a sewage treatment plant according to the actual operation condition, if the COD treatment effect is good, the COD gradient can be properly increased (delta Q can be adjusted in the three-dimensional tablei(ii) a Can be adjusted among three-dimensional tablesQj-Qi) The method is convenient and quick, can flexibly adapt to the actual working condition of a treatment plant, and is efficient and energy-saving.
3) The flow interval adjustable inflow Q gradient can be adjusted by each sewage treatment plant, and the flow gradient can be properly increased according to the actual operation working condition (the inside of the three-dimensional meter can be adjusted by delta P) when the treatment effect is goodi(ii) a P can be adjusted among the three-dimensional tablesj-Pi) The air blower is flexibly suitable for actual working conditions, and the efficient operation of the air blower is ensured, so that the economic and environmental benefits are improved.
4) Blower frequency step length adjustable blower frequency actual increase step lengthThe operation of the sewage treatment plant can be adjusted by a manufacturer according to the operation experience and the actual working condition of the sewage treatment plant. As can be seen from the formulas (2-2, 2-3),from k, Δ fnDetermining that the sewage treatment plant can be set according to the running condition of the blower, if a certain plant has a common blower and runs well, setting delta f15k is 0.9; setting delta f when the blower is operating normally15.5k 1; setting Δ f during poor operation1＝6k＝1.1。
5) The reaction time can be adjusted by the change of inflow and inflow COD each time, the response frequency of the blower can be calculated by the three-dimensional meter, and then the frequency of the blower is adjusted by the controller. From the change of the inflow or the inflow COD to the change of the frequency of the blower, the reaction time (delta t) is recorded, and the reaction time can be set and adjusted by a sewage treatment plant. The volume of the sewage treatment plant is large, the change of the water inlet quantity or the water quality does not immediately influence the operation of the whole water plant, so that the reaction time needs to be carefully set, and the phenomenon that the frequency of an air blower is increased too early to cause waste or the treatment effect is influenced later is avoided.
(4) Application scope
The method has important engineering practical value in the aspect of variable frequency regulation of the blower, and can be used for controlling various common equipment of sewage treatment plants such as a water pump, a dosing pump, a sludge pump, a stirrer and the like by adopting the method in other aspects, so that the aim of energy conservation and consumption reduction is fulfilled in each link of the sewage treatment plant, and higher economic and environmental benefits are obtained.
The number of devices and the scale of the process described herein are intended to simplify the description of the present invention. The application, modification and variation of the sewage treatment energy-saving control method and control system based on the three-variable three-dimensional table of the present invention will be apparent to those skilled in the art.
According to the invention, a three-dimensional table can be established by taking the inflow Q, the inflow water body chemical oxygen demand P and the outflow water chemical oxygen demand deviation Delta C as three variables, closed-loop feedback control is realized, the outflow water quality can be better ensured, the fluctuation of water conditions and processes is fully considered, on the premise of ensuring the outflow water quality, energy conservation and consumption reduction are realized, the accurate control on sewage drainage is realized, the high-efficiency energy-saving effect can be exerted in engineering, and the problem that the existing theoretical method is difficult to be practically applied is solved.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (10)
1. A sewage treatment energy-saving control method based on a three-variable three-dimensional table is characterized by being used for reasonably adjusting the output frequency of an air blower according to changes of sewage inflow flow, sewage inflow water body chemical oxygen demand and outlet water body chemical oxygen demand deviation, and comprising the following steps of:
1) establishing a three-dimensional table A with three variables of respectively gradually increased inflow Q, inflow water body chemical oxygen demand P and current outflow water body chemical oxygen demand deviation Delta C, wherein
Gradually increasing or decreasing the inlet water flow Q, the chemical oxygen demand P of the inlet water body and the chemical oxygen demand deviation Delta C of the current outlet water body, and gradually increasing or decreasing the theoretical working number n of the corresponding air blower;
the theoretical output frequency value of the corresponding air blower is gradually increased or decreased along with the gradual increase or decrease of the inflow water flow Q, the chemical oxygen demand P of the inflow water body and the chemical oxygen demand deviation Delta C of the current outflow water bodyGradually increasing or decreasing;
2) periodically and simultaneously intercepting the current inflow Q ', the current water inflow chemical oxygen demand P' and the current water outflow chemical oxygen demand C;
3) according to the intercepted chemical oxygen demand C of the current effluent and a set value C0Calculating the current chemical oxygen demand deviation delta C of the effluent water body by the difference value, wherein the set value C0Discharging the chemical oxygen demand of the water body to reach a standard value;
4) performing cross positioning in the three-dimensional table A according to the intercepted current inflow Q 'and the intercepted current chemical oxygen demand P' of the inflow water body to obtain the theoretical working number n of the air blower;
5) performing three-dimensional positioning in the three-dimensional table A according to the current water inlet flow Q ', the current water inlet water body chemical oxygen demand P' and the current water outlet water body chemical oxygen demand deviation delta C to obtain the theoretical output frequency value of the air blowerWherein,corresponding blower frequency values of the ith row and the jth column in the sub-table l of the three-dimensional table A;
6) according to the obtained theoretical working number n of the blower and the theoretical output frequency value of the blowerAnd adjusting the actual number n' of the working stations and the actual output frequency of the blower in real time.
2. The energy-saving sewage treatment control method based on the three-variable three-dimensional table according to claim 1,
when the number n' of the actual working tables of the blower is 1, and the theoretical output frequency value of the blower is obtained according to the three-dimensional table AThe actual working frequency of the blower is forced to be 0.6f, and the theoretical working number n of the blower is 1, wherein f is the maximum frequency value of the blower.
3. The energy-saving sewage treatment control method based on the trivariate three-dimensional table as claimed in claim 1, wherein when the actual number n' of working blowers is more than or equal to 2, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableAnd (3) when the theoretical number n of the blowers is n' -1, adjusting the actual number of the blowers to reduce the number of the blowers in the original working state by 1, and then repeating the steps 2) to 6), wherein f is the maximum frequency value of the blowers.
4. The energy-saving sewage treatment control method based on the trivariate three-dimensional table as claimed in claim 1, wherein when the actual number n' of working blowers is more than or equal to 1, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableWhen the actual working frequency of the blower is adjusted to the theoretical output frequency value of the blowerAdjusting the theoretical working number n of the blower to the actual working number n' of the blower;
when the actual number of blowersWhen n' is more than or equal to 1, and obtaining the theoretical output frequency value of the blower according to the three-dimensional tableAnd when the actual working frequency of the blower is forced to execute f, wherein the theoretical working number n of the blower is equal to n', and f is the maximum frequency value of the blower.
5. The energy-saving sewage treatment control method based on the trivariate three-dimensional table as claimed in claim 1, wherein when the actual number n' of working blowers is more than or equal to 1, the theoretical output frequency value of the blowers is obtained according to the three-dimensional tableWhen the frequency is larger than 1.1 times of the maximum frequency value f of the blower, the theoretical working number n of the blower is n' +1, the actual working number of the blower is adjusted to increase by 1 on the number of the blowers in the original working state, wherein f is the maximum frequency value of the blower.
6. The energy-saving sewage treatment control method based on the trivariate three-dimensional table as claimed in claim 1, wherein the actual number n ' of the working blowers and the deviation Δ C of the chemical oxygen demand of the current water outlet body are positioned in the three-dimensional table A, the intercepted chemical oxygen demand P ' of the current water inlet body is brought into the three-dimensional table A, and the maximum value P of the three-dimensional table A and the P ' is takennmaxMaking a comparison if P' > PnmaxAdjusting the actual number of the blowers to increase 1 blower on the original number of the blowers in the working state, wherein the specific method for positioning is that n' ═ A,wherein Δ C0Is a manual setting value.
7. The energy-saving sewage treatment control method based on the trivariate three-dimensional table as claimed in claim 1, wherein the actual number of the blowers is determined according to the actual number of the blowersn ' and the current water body COD deviation Delta C are positioned in the three-dimensional table A, the intercepted current inflow water flow Q ' is brought into the three-dimensional table A, and Q ' and the maximum value Q of the three-dimensional table A arenmaxMaking a comparison if Q' > QnmaxAdjusting the actual number of the blowers to increase 1 blower on the original number of the blowers in the working state, wherein the specific method for positioning is that n' ═ A,wherein Δ C0Is a manual setting value.
8. The energy-saving sewage treatment control method based on the trivariate three-dimensional table as claimed in claim 1, wherein when the actual number of working sets n 'of the blower is greater than or equal to 2, the actual number of working sets n' of the blower and the deviation Δ C of the chemical oxygen demand of the current effluent water body are positioned in the three-dimensional table A, the intercepted current inflow rate Q 'is brought into the three-dimensional table A, and Q' and the maximum value Q of the three-dimensional table A are set(n-1)maxMaking a comparison if Q' < Q(n-1)maxThe number of the blowers is adjusted to be 1 less than the number of the blowers in the original working state, wherein the positioning method is that n' is A,wherein Δ C0Is a manual setting value.
9. The energy-saving sewage treatment control method based on the three-variable three-dimensional table as claimed in any one of claims 1 to 8, wherein the theoretical output frequency value of the blowerThe algorithm is used for obtaining the following specific values:
wherein:corresponding to the ith row and the jth column in the branch table l of the three-dimensional table AA blower frequency value; f. ofnFor the fundamental frequency, f, in three-dimensional table An＝0.6f；Actually increasing the step length of the blower frequency in the three-dimensional table A;increasing the coefficient for the step size; Δ fnIs the basic step increment of the three-dimensional table A; n' and N respectively represent the total number of rows and columns in the three-dimensional table A-1,wherein Δ C0Is artificially set to [ i + j- (N' + N)/2%]The step number of i rows and j columns in the three-dimensional table A from the basic frequency in the three-dimensional table A is shown, namely, a plurality of step sizes are added to the basic frequency, and the three-dimensional table 1 is provided with (N' + N)/2 as 1; k is an instrument coefficient, and the instrument coefficient is 0.9-1.1; the three-dimensional table A is a part corresponding to the condition that the theoretical number of the blowers corresponding to the three-dimensional table is n; the three-dimensional table A-1 is a part corresponding to the condition that the theoretical number of the blowers corresponding to the three-dimensional table is n-1, and the three-dimensional table 1 is a part corresponding to the condition that the theoretical number of the blowers corresponding to the three-dimensional table is 1.
10. The energy-saving sewage treatment control method based on the trivariate three-dimensional table as claimed in claim 9, wherein when the maximum frequency value f of the blower is 50Hz, the single blower can bear the inflow Q of water at 0-1600 t/h and the COD P of the inflow water body at 0-400 mg/L.
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| GB1412590A (en) * | 1971-12-20 | 1975-11-05 | Gary Aircraft Corp | Biological treatment of liquid effluent |
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