CN108585173B - Optimal energy consumption control device and method for blast system of sewage treatment plant - Google Patents
Optimal energy consumption control device and method for blast system of sewage treatment plant Download PDFInfo
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Abstract
The invention discloses a device and a method for controlling optimal energy consumption of a blast system of a sewage treatment plant, wherein the device comprises: the optimal working condition control module of the air blower is used for controlling the air blower in the running state to be in the optimal working condition on the premise of meeting the given total air volume, improving the efficiency of the air blower and reducing the energy consumption of the air blower; the valve compensation adjusting module is used for controlling the valve to be in the maximum opening degree on the premise of meeting the air quantity distribution of the aeration system, reducing the total pressure of the aeration system and reducing the pressure loss of the aeration system; the aerator blockage judging module is used for monitoring the blockage condition of the aerator and prompting corresponding operation, so that the resistance loss of the aerator is reduced, and the overall efficiency of the aeration system is improved; and the energy consumption analysis module of the aeration system is used for calculating the difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system. The device and the method can effectively improve the overall efficiency of the blast system, reduce the overall energy consumption of the blast system and improve the operation management level of the sewage treatment plant.
Description
Technical Field
The invention relates to the technical field of urban sewage treatment, in particular to a control device and a control method for optimizing energy consumption of a blowing system of a sewage treatment plant.
Background
The mainstream process for sewage treatment in China comprises AAO (Anaerobic-aerobic), OD (Oxidation Ditch), SBR (sequencing batch reactor) and the like, wherein the AAO and SBR processes adopt a blast aeration technology, and the OD mainly adopts a surface aeration technology. In recent years, more and more OD processes have changed surface aeration to a blast aeration system during design or upgrading due to the good mixing properties and better oxygenation efficiency of blast aeration. The blast aeration energy consumption accounts for 50-60% of the operation energy consumption of the sewage treatment plant. The air blower improves the operation efficiency of the air blower on the premise of meeting the air volume requirement, reduces the energy consumption of the air blower, and has important significance for stable operation, energy conservation and consumption reduction of a sewage treatment plant.
The blast aeration system comprises a blower, a pipeline, a valve and an aerator. The aeration process is mainly a process that the air blower sucks air into the air chamber, the air is compressed and then pushed to flow in the pipeline, and finally the air is diffused into the water body through the aerator. Under the condition that the air quantity required by the system is constant, the lower the outlet pressure of the blower is, the lower the energy consumption is. Therefore, the pressure loss of the blast aeration system (comprising the blower, the pipeline, the valve, the aerator and the hydrostatic level) is researched and optimized, so that the outlet pressure of the blower can be reduced, and the energy consumption of the system is further reduced.
Due to the assessment requirements of effluent water quality on total nitrogen and the assessment of operation cost, in recent years, an aeration control system or a blower model control cabinet MCP (Master Content Provider) is adopted to automatically control the operation of a blower in the operation management process of a sewage treatment plant. In the air-blower control process at present, there are several problems: (1) first, there is a lack of understanding and control of outlet wind pressure. The main control target of the MCP is the control of air volume, and the control management of air pressure and efficiency of the air blower is neglected. The blower outlet pressure is only used as a protection parameter for preventing the blower from surging, and is not used as a target for optimizing the system, thereby having influence on the process design and the equipment selection. (2) Secondly, the high-efficiency operation of multiple fans in parallel is lacked. In order to obtain a good flow regulation range and avoid influencing normal production when equipment fails, a plurality of blowers are mostly selected to operate in a coordinated mode in a sewage treatment plant, and when two or more blowers work simultaneously, the performance of the blowers changes. For the condition that a plurality of blowers are operated in parallel, how to control the opening and combination condition of each blower to enable the blowers to be in an efficient section as far as possible on the premise of meeting the air volume requirement, and an effective solution is not available at present. (3) Third, there is a lack of overall analysis and control of blower system pressure loss. In the working process, the air blower needs to overcome the pressure loss of a pipeline, a valve and an aerator and also needs to overcome the hydrostatic pressure of an aeration tank, and the factors all contribute to the air pressure at the outlet of the air blower and need to be comprehensively considered. (4) Finally, there is a lack of automatic control devices and apparatus. At present, a control device for pressure loss of an aeration system is lacked, and even a good control method is adopted, timely adjustment and control are difficult to achieve depending on manpower, so that the optimization effect is difficult to ensure.
In addition, in the related art, when a plurality of fans are grouped to run, the adjustment of a single fan cannot keep the highest overall efficiency according to the air volume superposition principle; the valve opening coupling of the manifold line is serious, the mutual interference causes the opening not to be kept the maximum, the pressure loss of the valve can not be reduced to the minimum; the pressure loss of the aerator is difficult to monitor in real time and effective control measures are lacking to avoid pollution and blockage.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide a control device for optimizing the energy consumption of a blower system of a sewage treatment plant, which effectively improves the overall efficiency of the blower system, reduces the energy loss of the blower system and improves the operation management level of the sewage treatment plant.
Another object of the present invention is to propose a method for controlling the blast system of a sewage treatment plant with optimal energy consumption.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a control apparatus for optimizing energy consumption of a blower system of a sewage treatment plant, including: the controller is arranged in the automatic control system of the sewage treatment plant and is used for realizing the optimal control of the energy consumption of the blast system; the optimal working condition control module of the air blower is arranged in the controller and is used for controlling the air blower in the running state to be in optimal industrial control running on the premise of meeting the required air quantity, so that the efficiency of the air blower is improved, and the energy consumption of the air blower is reduced; the valve compensation adjusting module is arranged in the controller and is used for controlling the valve to be in the maximum opening degree on the premise of meeting the air quantity distribution of the aeration system, reducing the total pressure of the aeration system and improving the overall efficiency of the aeration system; the aerator blockage judging module is arranged in the controller and used for monitoring the blockage condition of the aerator and prompting corresponding operation, so that the resistance loss of the aerator is reduced, and the overall efficiency of the aeration system is improved; the energy consumption judging module of the aeration system is arranged in the controller and is used for calculating the difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system;
according to the control device for optimizing the energy consumption of the blower system of the sewage treatment plant, the blower in the running state is controlled to be in the optimal industrial control running state through the blower optimal working condition control module on the premise of meeting the required air volume, so that the efficiency of the blower is improved; the valve is controlled to be in the maximum opening degree through the valve compensation adjusting module on the premise of meeting the air quantity distribution of the aeration system, so that the total pressure of the aeration system is reduced; the blockage condition of the aerator is monitored in real time through the aerator blockage judging module, corresponding operation is prompted, and the resistance loss of the aerator is reduced; the energy consumption difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system is calculated in real time through the energy consumption judgment module of the aeration system, so that operation managers can conveniently and timely master the overall energy consumption condition of the blast aeration system.
In addition, the control device for optimizing the energy consumption of the blower system of the sewage treatment plant according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, when there are multiple blowers, the blower optimal condition control module is further configured to control an opening degree of a single blower to ensure that the efficiency of the blower is the highest, where the same blower maintains the same air volume, and blowers of different models adjust the opening degree and the air volume value of each blower according to an adjustment formula.
Further, in an embodiment of the present invention, when multiple fans are operating simultaneously, the calculation formula of the total power consumption P of the fans is simplified as follows:
wherein P is the total power of the blower in kWh, QiIs the actual air volume of the ith blower in m3/h，HiIs the outlet pressure of the ith blower in kPa, etaiEfficiency of the i-th blower, dimensionless, HBIs the outlet pressure of the main pipe of the blower in kPa, Qmax,iRated air quantity of i fans at the best working condition point, unit m3A is a coefficient in kg/m2·s；
By solving for
The minimum value of the total wind pressure H of the i blowers at the current outlet can be obtained when the required wind quantity Q is givenBLower optimum air quantity QiThe highest blower efficiency under the current combined working condition is that:
further, in an embodiment of the present invention, the method further includes: the valve compensation adjusting module carries out maximum opening control on the valve of the aeration branch pipe through a valve adjustment compensation algorithm by monitoring the branch pipe flow of the gas flowmeter, the branch pipe pressure of the pressure transmitter and the opening of the valve, wherein the opening of the adjusting valve of the branch pipe with the maximum air volume is always kept at 100 percent, and when the branch pipe flow with the maximum air volume needs to be increased or decreased, the adjusting action of the valve is compensated to other branch pipe valves in an equal proportion mode so as to ensure that the total resistance loss of a pipeline of the aeration system is minimum,
in the formula Qs,iSet air quantity, Q, for the ith main pipeset,iThe actual control target air quantity, Q, of the ith main pipet,iIs the current air quantity of the ith main pipe, sigma Qt,iΔ Q being the sum of the air flow outside the MOV compensation valvet,MOVThe calculated MOV is compensated for the varying air volume of the manifold.
Further, in an embodiment of the present invention, the aerator clogging determination module is further configured to calculate an aerator resistance coefficient and a variation thereof every time the blower is turned on or off according to a regulation algorithm, and determine a current state and corresponding control of the aerator according to the aerator resistance coefficient and the variation thereof.
Further, in an embodiment of the present invention, wherein the adjusting algorithm is:
wherein,
the long-term average value of the fitting intercept of the flow-pressure curve of the air blower in a given water inlet flow interval is obtained, delta h is the variable quantity of the resistance of an aerator of the aeration system, ha、hb、hcIs a set value of the resistance coefficient variation of the aerator; when h is generateda≤Δh＜hbIn the process, the aerator is flushed at large air quantity according to the preset cleaning time so as to delay the surface pollution of the aerator; when h is generatedb≤Δh＜hcIn time, the online cleaning is reminded to reduce the resistance loss of the aerator; when delta h is more than or equal to hcAnd the aerator is reminded to be replaced so as to reduce the pressure of the aeration system, improve the efficiency and save the aeration energy consumption.
Further, in an embodiment of the present invention, the aeration system energy consumption determination module is further configured to obtain the overall efficiency of the aeration system and the gap from the optimal working condition according to the operation parameters of the aeration system and the blower.
Further, in one embodiment of the present invention, the overall efficiency of the aeration system is calculated by the formula:
wherein, Ia、IbAnd IcFor the current value of the current operating current of the blower, Ia,0、Ib,0、Ic,0For the optimal working condition current of the air blower, U is the working voltage of the air blower, cos phi is the power factor, P is the current power of the aeration system, and P is0The optimal working condition power of the aeration system is obtained.
In order to achieve the above object, according to another embodiment of the present invention, a method for controlling an optimal energy consumption of a blower system of a sewage treatment plant is provided, where the method includes the following steps: detecting the current flow and the current pressure of the aeration main pipe; detecting the current flow and the current pressure of the aeration branch pipe; controlling the blower according to the current airflow flow and the current gas pressure of the main aeration pipe and the current working condition of the blower, so that the efficiency of the blower is improved and the energy consumption of the blower is reduced while the aeration quantity of the blower meets the current required gas quantity; controlling the at least one regulating valve according to the current flow and the current pressure of the aeration branch pipe and the opening degree of the at least one regulating valve, so that the total resistance loss of the aeration system is reduced and the overall efficiency of the aeration system is improved while the valve meets the air quantity distribution; the resistance of the aerator is evaluated and calculated by calculating the resistance coefficient and the variable quantity of the aerator, and the blockage of the aerator is delayed by corresponding operation, so that the efficiency of an aeration system is improved.
According to the control method for optimizing the energy consumption of the blower system of the sewage treatment plant, the blower in the running state is controlled to be in the optimal industrial control running state through the blower optimal working condition control module on the premise of meeting the required air volume, so that the efficiency of the blower is improved; the valve is controlled to be in the maximum opening degree through the valve compensation adjusting module on the premise of meeting the air quantity distribution of the aeration system, so that the total pressure of the aeration system is reduced; the blockage condition of the aerator is monitored in real time through the aerator blockage judging module, corresponding operation is prompted, and the resistance loss of the aerator is reduced; the energy consumption difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system is calculated in real time through the energy consumption judgment module of the aeration system, so that operation managers can conveniently and timely master the overall energy consumption condition of the blast aeration system.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a control device for optimizing energy consumption of a blower system of a sewage treatment plant according to one embodiment of the invention;
FIG. 2 is a schematic structural diagram of an optimal control system for aeration energy consumption of a blower according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a single blower performance curve and pressure loss curve for two blowers operating simultaneously in accordance with one embodiment of the present invention;
FIG. 4 is a diagram illustrating blower performance curves and pressure loss curves at corresponding openings when the total air volume is 1.7Q and the air volumes of two blowers are Q and 0.7Q, respectively, according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating blower performance curves and pressure loss curves at a corresponding opening degree when the total air volume is 1.7Q and the air volumes of two blowers are 0.85Q, respectively, according to an embodiment of the present invention;
FIG. 6 is a flow chart of a valve compensation adjustment algorithm according to one embodiment of the present invention;
fig. 7 is a flowchart of a method for controlling the optimal energy consumption of a blower system of a sewage treatment plant according to an embodiment of the present invention.
Reference numerals:
the aeration system comprises an aeration tank 1, a blower 2, a gas flowmeter 3 arranged on an aeration main pipe, gas flowmeters 3a and 3b arranged on aeration branch pipes, a pressure transmitter 4 arranged on an aeration main pipe, pressure transmitters 4a and 4b arranged on the aeration branch pipes, electric adjusting valves 5a and 5b arranged on the aeration branch pipes, a Programmable Logic Controller (PLC)6 and a blower aeration energy consumption optimal control system 7.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes an apparatus and a method for controlling an optimal energy consumption of a blower system of a sewage treatment plant according to an embodiment of the present invention with reference to the accompanying drawings, and first, an apparatus for controlling an optimal energy consumption of a blower system of a sewage treatment plant according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a control device for optimizing energy consumption of a blower system of a sewage treatment plant according to an embodiment of the invention.
As shown in fig. 1, the control device 10 for optimizing the energy consumption of the blower system of the sewage treatment plant comprises: the system comprises a controller 100, a blower optimal condition control module 200, a valve compensation adjusting module 300, an aerator blockage judging module 400 and an aeration system energy consumption judging module 500.
The controller 100 is arranged in an automatic control system of a biochemical unit of a sewage treatment plant and is used for realizing optimal control of energy consumption of a blast system; the optimal working condition control module 200 of the air blower is arranged in the controller and is used for controlling the air blower in the running state to be in optimal industrial control running on the premise of meeting the required air quantity, so that the aeration quantity of the air blower meets the current required air quantity, the efficiency of the air blower is improved, and the energy consumption of the air blower is reduced; the valve compensation adjusting module 300 is arranged in the controller and is used for controlling the valve to be in the maximum opening degree on the premise of meeting the air quantity distribution of the aeration system, so that the total resistance loss of the aeration system is reduced and the overall efficiency of the aeration system is improved while the valve meets the air quantity distribution; the aerator blockage judging module 400 is arranged in the controller and is used for monitoring the blockage condition of the aerator and prompting corresponding operation; an energy consumption determination module 500 arranged in the controller for calculating the difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system
Specifically, as shown in fig. 2, the aeration tank 1, a blower 2 having a regulation function, a gas flow meter 3 and a pressure transmitter 4 mounted on a main aeration pipe, electric control valves 5a and 5b mounted on branch aeration pipes, and branch gas flow meters 3a and 3b and branch pressure transmitters 4a and 4b are provided.
As shown in fig. 2, the control system 7 of the embodiment of the present invention collects data of the blower 2, the gas flow meters 3, 3a, and 3b, the pressure transmitters 4, 4a, and 4b, and the electric control valve 5 through a PLC (Programmable logic controller) 6, and automatically adjusts the frequency (or opening) and start/stop of the blower 2 according to the required gas amount, and the opening of the electric control valves 5a and 5b, so that the aeration amount of the blower meets the required gas amount, and reduces the energy consumption of the blower 2. The optimal control system 7 for the aeration energy consumption of the blower can be deployed on an industrial tablet computer or an industrial control computer to realize human-computer interaction or remote monitoring.
Further, as shown in fig. 3, the performance curve and the pressure loss curve of the blower are shown, and the intersection point of the two curves is the operating point of the blower. The shape of the blower operating curve is approximate to a parabola, so that the blower operating curve can be fitted according to a quadratic function, and the following can be obtained:
H≈Hm-a1Q2-a2Q
h≈b1Q2+b2Q+H0
in the formula: h is the outlet pressure of the blower, H is the pressure of the aeration system, HmAt the maximum outlet pressure of the blower, H0The unit is the hydrostatic pressure of an aeration system, kPa, Q is the air quantity of a blower, m3/h，a1、a2、b1、b2Is a coefficient and has no dimension.
The power consumption P of the blower system is related to useful work Q.H and efficiency eta, and has the following formula:
in the formula: p is the power consumption of the blower, the unit kWh, Q is the air volume of the blower, and the unit Nm3H is the outlet pressure of the blower, and the unit kPa, eta is the efficiency of the blower, and is dimensionless.
Therefore, when the work output air quantity Q is constant, the reduction of the energy consumption P needs to be realized, the blower efficiency eta needs to be improved, and the air pressure H of the aeration system needs to be reduced. The improvement of the efficiency eta of the air blower is mainly realized by optimizing the operating condition point of the fan, and the reduction of the air pressure H of the aeration system needs to consider the adjustment of a pipeline system.
As known from the working principle and the design specification of the air blowing system, the outlet pressure H of the aeration system comprises the following 4 factors:
H＝h1+h2+h3+h4，
in the formula, h1Hydrostatic pressure above the air release point of the aerator, h2Is the on-way resistance loss of the pipeline, h3Is the local resistance loss of the pipeline, h4The unit is the resistance loss of the aerator and is kPa. Wherein h is1Determined by design parameters and water inlet flow; h is3The shape and the opening size of the valve core of the valve are related, and the installed valve is mainly determined by the opening of the valve; h is4Is determined by the characteristics of the aerator and factors such as blockage, pollution and the like in the operation process.
Hydrostatic pressure h1The device is mainly influenced by the liquid level in the tank, when the flow is large, the hydrostatic pressure is slightly increased, and the control is difficult generally. Loss h of pipe system2The air quantity is designed in a definite specified range, and the change range of pipeline resistance loss in the operation process is not large, generally thousands of Pa, and is far less than the resistance loss caused by a regulating valve and an aerator. Therefore, there are two main methods for reducing and optimizing the outlet pressure H of the aeration system: reducing valve pressure loss h3 and reducing aerator drag loss h4。
The system analysis functions of improving the blower efficiency, reducing the valve pressure loss, reducing the aerator resistance loss and the pressure loss and efficiency will be described in detail below.
Further, in an embodiment of the present invention, when there are multiple blowers, the optimum operating condition control module 200 of the blower is further configured to control the opening degree of a single blower to ensure the highest efficiency of the blowers, wherein the same blower maintains the same air volume, and the opening degree and the air volume value of each blower are adjusted by blowers of different models according to an adjustment formula.
Specifically, when two fans are running simultaneously, as shown in FIG. 3, when the wind is runningWhen the amount is increased to 2q from q, the working condition point of a single fan is transferred to C from B, the working condition point of the single fan stops at the D point along with the stable system, and at the moment, the wind pressure of the fan is increased by delta H (H)D-hBThe air volume increase Δ Q ═ QD-q。
Under the condition that a plurality of fans operate simultaneously, when the target air quantity Q is certain, the following steps are provided:
at this time, the total power consumption P of the n wind blowers is:
in the formula, QiIs the aeration rate of the ith blower in m3/h，HiIs the outlet pressure of the ith blower in kPa, etaiEfficiency of the i-th blower, dimensionless, PiPower for the ith blower in kWh.
According to the similarity principle of the air blower, when the rotation speed of the air blower is adjusted, the air quantity is enabled to be rated from the optimal working conditionmaxWhen becoming Q, correspond export wind pressure and the change proportion of efficiency and be:
because the blowers are operated in parallel, the outlet pressure of the i blowers is the same, namely Hi＝HBTherefore, the above formula can be further simplified as,
in the formula HBIs the outlet pressure of the main pipe of the blower in kPa, QiIs the actual air quantity of i fans, Qmax,iRated air quantity of i fans at the best working condition point, unit m3A is a coefficient in kg/m2·s。
Therefore, only solution is needed
The minimum value of the total wind pressure H of the air blower at the current outlet can be obtainedBThe optimal air volume is the highest blower efficiency under the current combined working condition.
Further, the optimization problem is abstracted as an algebraic problem, which is a problem to be solved as follows:
knowing x1+x2+…+xnWhen Q is satisfied, get
Is measured.
Solving the problem, and then calculating the actual flow Q of the i fansiSubstitution of xiRated flow Q of i fansmax,iSubstitution into aiWhen the given air quantity Q is obtained, the optimal air quantity Q of the ith faniAnd the fan is enabled to have the lowest power P as a whole.
For n blowers with the same specification (rated air quantity Q of optimal working point)max,i＝Qm) The parallel operation is as follows:
at this time, the total power P is an optimal state:
if a plurality of fans or fans with various specifications are operated, the calculation can be carried out by referring to a general formula.
When the sewage treatment plant is actually designed, 2 specifications of blast air can be adoptedThe machine is operated in a matching way, is set to be x-type and y-type, and the rated air quantity corresponding to the optimal working condition point is Qm,x、Qm,y. If 1 blower is operated, the air volume of a single blower should be set as follows for the air volume required Q:
wherein x and y are blower models, Qm,xRated air quantity Q corresponding to the optimal working condition point of the x-type blowerm,yThe rated air volume of the y-type air blower corresponding to the optimal working condition point is shown, and Q is the air volume demand.
According to the algorithm, when two or more blowers run simultaneously, the optimal control system for aeration energy consumption of the blowers can automatically adjust the opening of the single blower so as to ensure the highest overall efficiency of the blowers. For example, as shown in fig. 4 and 5, the blower performance curve and the pressure loss curve correspond to the opening degree when the air volumes of the two blowers are Q and 2Q, respectively, and correspond to the opening degree when the air volumes of the two blowers are 0.85Q, respectively, and the adjustment principle is as follows: the same air volume is kept by the same blower, and the opening and the air volume value of each blower are adjusted by the blowers of different models according to the above algorithm.
Further, in an embodiment of the present invention, the valve compensation adjustment module 300 is further configured to perform maximum opening control on the valve of the branch aeration pipe according to a valve adjustment compensation algorithm, wherein the opening of the adjustment valve of the branch pipe with the maximum air volume is always kept at 100%, and when the flow of the branch pipe with the maximum air volume needs to be increased or decreased, the adjustment action of the valve is compensated to other branch pipe valves in an equal proportion manner, so as to ensure that the total resistance loss of the pipeline of the aeration system is minimum.
Specifically, embodiments of the present invention arrange a main pipe pressure gauge, a branch regulating valve, a branch pressure gauge, and a branch gas flow meter. By adjusting the valve opening D, the flow area S of the valve can be changed. According to the bernoulli equation, the flow Q through the valve during regulation can be approximated to the pressure loss Δ P as follows:
the above formula is simplified to obtain
Wherein Q is the air quantity flowing through the valve, A is the maximum cross-sectional area of the valve, rho is the gas density, and S is the valve flow area and has a fixed functional relation with the valve opening D. Therefore, it can be seen that Δ P decreases in a square relationship with a gradual increase in S.
According to the algorithm, the valve regulation compensation algorithm of the optimal control system for the aeration energy consumption of the blower controls the maximum opening of the aeration branch pipe valve. During specific adjustment, the branch pipe with the largest actual air volume is recorded as k, the opening D of the regulating valve of the branch pipe of k is always kept at 100%, and when the flow of the branch pipe needs to be increased or decreased, the regulating action of the valve is compensated to other branch pipe valves in an equal proportion mode to ensure the pipeline resistance loss h of the aeration system3And (4) optimizing.
The valve adjustment compensation algorithm is shown in fig. 6, and specifically includes:
namely, Delta Q1When the air quantity is larger than or equal to M (M is an air quantity regulation dead zone), the compensation algorithm firstly judges whether the valve 1 is in the maximum opening degree, and if the valve 1 is not in the maximum opening degree, the system automatically regulates the valve 1 to the maximum opening degree; when the branch pipe where the valve 1 is positioned needs to increase aeration quantity, namely delta Q1When the air quantity is larger than M (M is an air quantity regulation dead zone), the valve VF is judgediWhether it is larger than the minimum opening VF of the valveiminIf, if
Turning down
Up to the valve
The air quantity variation delta Q of the branch pipe is equal to the air quantity regulating quantity delta Q of the branch pipeiSuperimposing the amount of gas Δ Q dispensed by the valve 11iIf the valve VFiAt the minimum opening degree VFiminThen the adjustment of the valve continues to compensate for the valve i-1 according to the same principle; similarly, when the branch pipe where the valve 1 is located needs to reduce the aeration quantity, namely delta Q1When the air quantity is less than M (M is an air quantity regulation dead zone), the valve VF is judgediWhether or not it is smaller than the maximum opening VF of the valveimaxIf, if
Is adjusted to be big
Up to the valve
The air quantity variation delta Q of the branch pipe is equal to the air quantity regulating quantity delta Q of the branch pipeiSuperimposing the amount of gas Δ Q dispensed by the valve 11iIf the valve VFiAt the maximum opening degree VFimaxThe valve adjustment continues to be compensated to valve i-1 on the same principle.
In the formula Qs,iSet air quantity, Q, for the ith main pipeset,iThe actual control target air quantity, Q, of the ith main pipet,iIs the current air quantity of the ith main pipe, sigma Qt,iΔ Q being the sum of the air flow outside the MOV compensation valvet,MOVThe variable quantity of the set value of the air quantity of the MOV compensation branch pipe is obtained through calculation.
Further, in an embodiment of the present invention, the aerator clogging determination module 400 is further configured to calculate the aerator resistance coefficient and the variation thereof at each start and stop of the blower according to the adjustment algorithm, and determine the current state of the aerator and the corresponding control according to the aerator resistance coefficient and the variation thereof.
Specifically, as shown in fig. 7, when the inflow rate of water largely changes, the hydrostatic pressure h1With the change, the operating blower outlet pressure H also changes. In order to reduce the resistance loss h of the aerator4The resistance loss of the aerator needs to be calculated, the amplitude of the resistance loss is evaluated, and corresponding measures are taken.
According to the working principle of the air blowing system, the pressure of the aeration system is composed of hydrostatic pressure above an air release point of an aerator, on-way resistance loss and local resistance loss of a pipeline and resistance loss of the aerator. Setting the total flow (water inlet flow plus internal and external reflux) Q of the water inlet of the aeration tankINThe retention time T of the aeration tank, the effective area A of the aeration tank and the designed water depth h of the tank bodyaThe mounting position of the aerator is h away from the grounda0The hydrostatic pressure H under actual operating conditions can be calculated0：
If the aeration tank is provided with a liquid level meter, the liquid level h of the aeration tank can be directly measuredbCalculating H0：
H0＝hb-ha0，
Considering that the valve opening is not changed, the loss amplitude of the pipeline system along the way is small, so the main pressure loss can be attributed to the resistance characteristic of the aerator. At the time t, linear fitting is carried out by taking the air quantity Q of the blower as an independent variable and the air pressure H as a dependent variable to obtain the intercept Ht. Calculating hydrostatic pressure H0Then, the pressure change value Δ H ═ Ht-H0The indicator represents the blockage condition of the aerator.
In one embodiment of the present invention, wherein the adjusting algorithm is:
wherein,
for given purposeThe long-term average value of the fitting intercept of the flow-pressure curve of the air blower in the water inlet flow interval, delta h is the variable quantity of the resistance of the aerator of the aeration system, ha、hb、hcThe unit of the set value of the resistance coefficient variation of the aerator is kPa.
Further, in an embodiment of the present invention, wherein, when h isa≤Δh＜hbIn the process, the aerator is flushed at large air quantity according to the preset cleaning time so as to delay the surface pollution of the aerator; when h is generatedb≤Δh＜hcIn time, the online cleaning is reminded to reduce the resistance loss of the aerator; when delta h is more than or equal to hcAnd the aerator is reminded to be replaced so as to reduce the pressure of the aeration system, improve the efficiency and save the aeration energy consumption.
Specifically, the optimal control system for the aeration energy consumption of the blower calculates the resistance coefficient h of the aerator and the variation delta h thereof when the blower is started or stopped every time, judges the variation delta h of the resistance coefficient of the aerator, and judges the variation delta h of the resistance coefficient of the aerator when h is judgeda≤Δh＜hbThe system automatically washes the aerator at a fixed time by large air quantity to delay the surface pollution of the aerator, and the fixed time is 1 day or 1 week and is set by operators; when the inorganic salt scaling of the aerator is gradually serious, namely hb≤Δh＜hcIn time, the operator is reminded to perform online cleaning on the aerator so as to reduce the resistance loss of the aerator; when the on-line cleaning is carried out, the resistance loss of the aerator cannot be reduced, namely, the delta h is more than or equal to hcAnd the system reminds operators to replace the aerator so as to reduce the pressure of the aeration system, improve the efficiency and save the aeration energy consumption.
Further, in an embodiment of the present invention, the aeration system energy consumption determination module 500 is further configured to obtain the overall efficiency of the aeration system and the gap from the optimal operating condition according to the operating parameters of the aeration system and the blower.
Specifically, in the daily operation management process of the sewage treatment plant, the operation parameters of the blower in the aeration system, the pressure of the main pipe, the air volume and other information can be observed only visually, the integral efficiency and energy loss of the aeration system are not known specifically, and the optimal control system for the aeration energy consumption of the blower can calculate the difference between the integral efficiency and the optimal working condition of the aeration system through monitoring the instruments of the aeration system and the operation parameters of the blower.
Further, in one embodiment of the present invention, the overall efficiency of the aeration system is calculated by the formula:
wherein, Ia、IbAnd IcFor the current value of the current operating current of the blower, Ia,0、Ib,0、Ic,0For the optimal working condition current of the air blower, U is the working voltage of the air blower, cos phi is the power factor, P is the current power of the aeration system, and P is0The optimal working condition power of the aeration system is obtained.
Specifically, taking fig. 2 as an example to illustrate the pressure loss and efficiency system analysis function of the system, the blower equipment and the operation parameters are input into the blower aeration energy consumption optimal control system 7, and the air quantity Q when the efficiency of each blower is the highest can be calculated by the blower efficiency improving modulea、Qb、QcAnd the current value I corresponding to the optimal working condition recorded by the system in daily operationa,0、Ib,0、ic,0Comparing the current running current value of the air blower with the current of the optimal working condition, namely the overall efficiency of the air blower under the current working condition, as follows:
in the aeration system under the non-optimal condition, part of total energy consumption is energy consumption increased when the air blower is not under the optimal working condition, and part of the total energy consumption is extra energy consumption caused by the increase of the resistance loss of the aeration system. Calculating the increased total energy consumption Δ P as pressed:
in summary, the device of the embodiment of the invention with 10 meshes mainly realizes that the opening degree of the air blower and the opening degree of the valve are automatically adjusted according to the required air quantity when a single or a plurality of air blowers in an aeration control system of a sewage treatment plant operate, so that the efficiency of the air blower is improved and the function of the air blower is reduced on the premise that the air blower meets the required air quantity. The embodiment of the invention researches the blowers, the valves, the pipelines and the aerators as a whole, provides a solution and automatic control equipment, and ensures that a plurality of blowers are in a high-efficiency state when in cooperative operation, the pressure loss of the valves and the pipelines is minimum and the pressure loss of the aerators is controlled in real time. The embodiment of the invention automatically adjusts the air quantity according to the performance characteristic of the blower, calculates and optimizes the efficiency, carries out timely adjustment and compensation control according to the adjustment characteristic of the valve and the structural characteristic of the pipeline, detects the resistance characteristic of the aerator, and adopts automatic measures to wash or clean.
According to the control device for optimizing the energy consumption of the blast system of the sewage treatment plant, which is provided by the embodiment of the invention, the air blower in the running state is controlled to be in the optimal industrial control running state through the air blower optimal working condition control module on the premise of meeting the required air volume, so that the efficiency of the air blower is improved, and the energy consumption of the air blower is reduced; the valve is controlled to be in the maximum opening degree by the valve compensation adjusting module on the premise of meeting the air quantity distribution of the aeration system, so that the total pressure of the aeration system is reduced, and the overall efficiency of the aeration system is improved; the blockage condition of the aerator is monitored by the aerator blockage judging module and corresponding operation is prompted, so that the resistance loss of the aerator is reduced, and the overall efficiency of the aeration system is improved; the energy consumption difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system is calculated through an aeration system energy consumption judging module, so that operation managers can conveniently master the whole energy consumption condition of the blast aeration system in time; the device and the method can effectively improve the overall efficiency of the blast system, reduce the overall energy consumption of the blast system and improve the operation management level of the sewage treatment plant.
Fig. 7 is a flow chart of a method for controlling the optimal energy consumption of a blower system of a sewage treatment plant according to an embodiment of the present invention.
As shown in fig. 7, the method for controlling the optimal energy consumption of the blower system of the sewage treatment plant adopts the device for controlling the optimal energy consumption of the blower system of the sewage treatment plant according to the embodiment of the invention, wherein the method comprises the following steps:
detecting the current flow and the current pressure of an aeration main pipe, and controlling an air blower according to the current air flow and the current air pressure of the aeration main pipe and the current working condition of the air blower so that the aeration quantity of the air blower meets the current required air quantity and is in the optimal working condition;
detecting the current flow and the current pressure of the aeration branch pipe, and controlling at least one regulating valve according to the current gas flow and the current gas pressure of the aeration branch pipe and the opening of at least one regulating valve so that the valve is in the maximum opening while meeting gas distribution;
calculating the resistance coefficient and the variable quantity of the aerator, evaluating and calculating the resistance of the aerator, delaying the blockage of the aerator through corresponding operation, and reducing the resistance loss of the aerator;
and step four, calculating the difference between the current working condition energy consumption and the optimal working condition energy consumption of the air blower system, so that managers can conveniently master the overall energy consumption condition of the air blower aeration system in time, the efficiency of the air blower is improved, the energy consumption of the air blower is reduced, and the operation management level of a sewage treatment plant is improved.
It should be noted that the explanation of the embodiment of the control device for optimizing the energy consumption of the blower system of the sewage treatment plant also applies to the control method for optimizing the energy consumption of the blower system of the sewage treatment plant of the embodiment, and details are not repeated here.
According to the optimal control method for the energy consumption of the blowing system of the sewage treatment plant, which is provided by the embodiment of the invention, the blower in the running state is controlled to be in optimal industrial control operation by the blower optimal working condition control module on the premise of meeting the required air volume, so that the efficiency of the blower is improved, and the energy consumption of the blower is reduced; the valve is controlled to be in the maximum opening degree by the valve compensation adjusting module on the premise of meeting the air quantity distribution of the aeration system, so that the total pressure of the aeration system is reduced, and the overall efficiency of the aeration system is improved; the blockage condition of the aerator is monitored by the aerator blockage judging module and corresponding operation is prompted, so that the resistance loss of the aerator is reduced, and the overall efficiency of the aeration system is improved; the energy consumption difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system is calculated through an aeration system energy consumption judging module, so that operation managers can conveniently master the whole energy consumption condition of the blast aeration system in time; the device and the method can effectively improve the overall efficiency of the blast system, reduce the overall energy consumption of the blast system and improve the operation management level of the sewage treatment plant.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A control device for optimizing energy consumption of a blower system of a sewage treatment plant is characterized by comprising:
the controller is arranged in the biochemical unit automatic control system of the sewage treatment plant and is used for realizing the optimal control of the energy consumption of the blast system;
the optimal working condition control module of the air blower is arranged in the controller and is used for controlling the air blower in the running state to run under the optimal working condition on the premise of meeting the required air volume, when a plurality of air blowers are arranged, the optimal working condition control module of the air blower is further used for controlling the opening degree of a single air blower so as to ensure the highest efficiency of the air blower, wherein the same air volume is kept by the same air blower, and the opening degree and the air volume value of each air blower are adjusted by the air blowers of different types according to an adjustment formula; under the condition that a plurality of fans operate simultaneously, the calculation formula of the total power consumption P of the fans is simplified as follows:
wherein P is the total power of the blower in kWh, QiIs the actual air volume of the ith blower in m3/h，HiIs the outlet pressure of the ith blower in kPa, etaiEfficiency of the i-th blower, dimensionless, HBIs the outlet pressure of the main pipe of the blower in kPa, Qmax,iRated air quantity of the ith fan at the optimal working condition point in unit of m3A is a coefficient in kg/m2S; by solving for
The minimum value of (a) is obtained, when the air quantity Q is given, the total wind pressure H of the ith blower at the current outlet is obtainedBLower optimum air quantity QiThe highest blower efficiency under the current combined working condition:
the valve compensation adjusting module is arranged in the controller and is used for controlling the valve to be in the maximum opening degree on the premise of meeting the air quantity distribution of the aeration system;
the aerator blockage judging module is arranged in the controller and is used for monitoring the blockage condition of the aerator and prompting corresponding operation;
the energy consumption judging module of the aeration system is arranged in the controller and is used for calculating the difference between the current working condition energy consumption and the optimal working condition energy consumption of the blast aeration system;
the valve compensation adjusting module carries out maximum opening control on the valve of the aeration branch pipe through monitoring the branch pipe flow of the gas flowmeter, the branch pipe pressure of the pressure transmitter and the opening of the valve by a valve adjustment compensation algorithm, wherein the opening of the adjusting valve of the branch pipe with the maximum air volume is always kept at 100%, and when the flow of the branch pipe with the maximum air volume needs to be increased or decreased, the adjusting action of the valve is compensated to other branch pipe valves in an equal proportion mode so as to ensure that the total resistance loss of a pipeline of the aeration system is minimum.
2. The optimal control device for blast system energy consumption of sewage treatment plant according to claim 1, wherein,
in the formula, Qs,iSet air quantity, Q, for the ith main pipeset,iThe actual control target air quantity, Q, of the ith main pipet,iIs the current air quantity of the ith main pipe, sigma Qt,iΔ Q being the sum of the air flow outside the MOV compensation valvet,MOVThe calculated MOV is compensated for the varying air volume of the manifold.
3. The optimal control device for the blower system of the sewage treatment plant according to claim 1, wherein the aerator blockage determination module is further configured to calculate an aerator resistance coefficient and a variation thereof every time the blower is started or stopped according to a regulation algorithm, and determine a current state and corresponding control of the aerator according to the aerator resistance coefficient and the variation thereof.
4. The optimal control device for blast system energy consumption of sewage treatment plant according to claim 3, wherein the adjusting algorithm is:
wherein,
the long-term average value of the fitting intercept of the flow-pressure curve of the air blower in a given water inlet flow interval is obtained, delta h is the variable quantity of the resistance of an aerator of the aeration system, ha、hb、hcIs a set value of the resistance coefficient variation of the aerator;
when h is generateda≤Δh<hbIn the process, the aerator is subjected to large washing according to the preset washing time so as to delay the surface pollution of the aerator;
when h is generatedb≤Δh<hcIn time, the online cleaning is reminded to reduce the resistance loss of the aerator;
when delta h is more than or equal to hcAnd the aerator is reminded to be replaced so as to reduce the pressure of the aeration system, improve the efficiency and save the aeration energy consumption.
5. The optimal control device for the blowing system energy consumption of the sewage treatment plant according to claim 1, wherein the energy consumption judging module of the aeration system is further used for acquiring the overall efficiency of the aeration system and the difference from the optimal working condition according to the operation parameters of the aeration system and the blower.
6. The optimal energy consumption control device for the blower system of the sewage treatment plant according to claim 5, wherein the calculation formula of the overall efficiency of the aeration system is as follows:
wherein, Ia、IbAnd IcFor the current value of the current operating current of the blower, Ia,0、Ib,0、Ic,0For the optimal working condition current of the air blower, U is the working voltage of the air blower, cos phi is the power factor, P is the current power of the aeration system, and P is0The optimal working condition power of the aeration system is obtained.
7. A method for controlling the optimal energy consumption of a blower system of a sewage treatment plant, which is characterized in that the device for controlling the optimal energy consumption of the blower system of the sewage treatment plant according to any one of claims 1-6 is adopted, wherein the method comprises the following steps:
detecting the current flow and the current pressure of the aeration main pipe; detecting the current flow and the current pressure of the aeration branch pipe;
controlling the air blower according to the current airflow flow and the current gas pressure of the main aeration pipe and the current working condition of the air blower; the opening of the regulating valve of the branch pipe with the maximum air volume is always kept at 100% according to the current flow and the current pressure of the aeration branch pipe, and when the flow of the branch pipe with the maximum air volume needs to be increased or decreased, the regulating action of the valve is compensated to other branch pipe valves in an equal proportion mode so as to ensure that the total resistance loss of the pipeline of the aeration system is minimum; and evaluating and calculating the resistance of the aerator by calculating the resistance coefficient and the variable quantity of the aerator, and delaying the blockage of the aerator through corresponding 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 |
| CN114249437B (en) * | 2021-12-21 | 2023-09-29 | 北控(秦皇岛)水务有限责任公司 | Control method and device applied to sewage treatment |
| CN114249415B (en) * | 2021-12-22 | 2023-07-04 | 北京城市排水集团有限责任公司 | Accurate aeration device and method |
| CN114384957B (en) * | 2022-01-17 | 2023-04-25 | 雷沃工程机械集团有限公司 | Intelligent control system and method for crushing working condition of excavator |
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