CN113754045A - Accurate control device and control method for flow field of biological tank - Google Patents

Accurate control device and control method for flow field of biological tank Download PDF

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CN113754045A
CN113754045A CN202111069406.1A CN202111069406A CN113754045A CN 113754045 A CN113754045 A CN 113754045A CN 202111069406 A CN202111069406 A CN 202111069406A CN 113754045 A CN113754045 A CN 113754045A
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speed
speed sensor
regulator
flow
mixer
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CN113754045B (en
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陈斌
常少华
周天旭
杜沁熹
杨陈
李善庭
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Nanjing Hegao Energy Conservation And Environmental Protection Technology Service Co ltd
Nanjing University of Information Science and Technology
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Nanjing Hegao Energy Conservation And Environmental Protection Technology Service Co ltd
Nanjing University of Information Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

The invention discloses a biological pool flow field accurate control device, which is arranged in a biological pool and comprises a submersible mixer, an axial flow rate regulator, a guide rod, a speed sensor and a control system, wherein the control system is arranged on the biological pool, the guide rod is vertically arranged in the biological pool, the submersible mixer is arranged on the guide rod, one side of the submersible mixer is provided with a variable frequency control panel, the biological pool is internally provided with the axial flow rate regulator and the speed sensor, the axial flow rate regulator is vertically arranged right in front of the submersible mixer, and the speed sensor and the variable frequency control panel are connected with the control system. The sludge sedimentation phenomenon can not be generated.

Description

Accurate control device and control method for flow field of biological tank
Technical Field
The invention relates to a device and a method for accurately controlling a flow field of a biological pond, and belongs to the technical field of sewage treatment.
Background
The biological pond utilizes the metabolism function of a large amount of beneficial microorganisms to degrade and convert organic pollutants in a dissolved and colloidal state into harmless substances in the sewage, so that the sewage is purified. The sewage treatment standard specifies that the average flow velocity of the sewage in the biological tank is not less than 0.25m/s, and the flow velocity of the sewage is generally specified to be 0.25 m/s-0.35 m/s in engineering practice. In the biological pool, the power for realizing that the sewage does not generate the sedimentation phenomenon mainly comes from a submersible mixer (impeller), the submersible mixer is horizontally arranged in the pool, and the axial thrust generated by a rotating impeller pushes the sewage in the pool to flow forwards.
1. Because the axial thrust of the submersible mixer is closely related to the power, the diameter and the type of the impeller, the rotating speed of the impeller and the like, the flowing speed of the sewage is gradually reduced in the axial direction. Therefore, a plurality of submersible mixers are needed in the biological pond to maintain the flow rate of the sewage so as to ensure that the activated sludge is in a suspension state.
2. The plane flow field of the submersible mixer not only contains the speed of the axis, but also contains the speed distribution at two sides of the axis of the mixer, the speed distribution in the width direction is also uneven, the farther the plane flow field is away from the axis of the mixer, the lower the sewage flow speed is, the state of activated sludge is influenced, the sludge sedimentation phenomenon is easily generated in the area with lower speed, and the activated sludge can not be ensured to be in a suspension state.
3. The flow field of the submersible mixer is changed in the plane of the biological pond due to the boundary effect of the pond wall or the mutual interference of the flow fields of all the mixers, the flow velocity of some areas is low, the sludge sedimentation phenomenon is easy to generate, and the activated sludge can not be ensured to be in a suspension state.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for accurately controlling a flow field of a biological tank, which are used for accurately controlling the flow field of the biological tank, namely dynamically and accurately controlling the flow speed of the plane of the biological tank, expanding the stirring range of the plane and reducing the stirring dead zone so as to ensure that activated sludge at different positions of the biological tank is in a suspended state better and the sludge sedimentation phenomenon cannot be generated.
In order to solve the technical problems, the invention provides a flow field accurate control device for a biological pool, which is arranged in the biological pool and comprises a submersible mixer, an axial flow rate regulator, a guide rod, a speed sensor and a control system, wherein the control system is arranged on the biological pool, the guide rod is vertically arranged in the biological pool, the submersible mixer is arranged on the guide rod in a sliding manner, one side of the submersible mixer is provided with a variable frequency control panel, the biological pool is internally provided with the axial flow rate regulator and the speed sensor, the axial flow rate regulator is vertically arranged on the submersible mixer, and the axial flow rate regulator is positioned right in front of the submersible mixer, wherein:
the axial flow velocity regulator comprises a first bearing body, a second bearing body, a wing type, an angle regulator and a positioning pin, wherein a rotating hole is formed in the wing type;
the speed sensor and the variable frequency control panel are connected with the control system.
The technical scheme of the invention is further defined as follows:
furthermore, in the device for accurately controlling the flow field of the biological pond, the number of the submersible mixers is at least one.
In the device for accurately controlling the flow field of the biological pool, the installation height of the axis of the submersible mixer, namely the distance from the submersible mixer to the bottom of the biological pool, is 500-1500 mm.
In the device for accurately controlling the flow field of the biological pond, the distance between the axial flow rate regulator and the front end of the impeller of the submersible stirring machine is 300-600 mm.
In the device for accurately controlling the flow field of the biological pond, the speed sensors comprise a first speed sensor and a second speed sensor which are arranged in the biological pond in a submerged mode, and the first speed sensor and the second speed sensor are symmetrically positioned on two sides of the axis of the submersible mixer and positioned on the horizontal plane where the axis of the submersible mixer is positioned.
In the device for accurately controlling the flow field of the biological pond, the number of the speed sensors is 2n, the number of the first speed sensors and the number of the second speed sensors are n respectively, and n is the number of the submersible mixers.
In the device for accurately controlling the flow field of the biological pond, the wing profile is formed by enveloping the pressure surface and the suction surface, and the rotating hole on the wing profile is a penetrating hole in the thickness direction of the wing profile.
The invention also relates to a biological pool flow field accurate control method based on the device, wherein the biological pool flow field accurate control device is arranged in the biological pool, when the angle adjustment of the submersible mixer in the horizontal direction is well fixed and the flow field of the biological pool is stable in the operation process of the biological pool, the first speed sensors and the second speed sensors which are arranged below the liquid level at the two sides of the submersible mixer transmit the measured data to the control system, and an operator adjusts the frequency or the axial flow rate adjuster of the submersible mixer according to the measured data so as to control the flow field:
the first mode is as follows:
when the flow rates displayed by a first speed sensor on one side of the submersible mixer and a second speed sensor on the other side of the submersible mixer on the horizontal plane on which the axis is positioned are simultaneously larger or smaller, the control system determines the running frequency of the submersible mixer according to the measured speed values and controls the running frequency of a motor of the submersible mixer so as to control the flow rate of the fluid and enable the flow rate of the fluid to be in a set range;
and a second mode:
when the first speed sensor on one side of the submersible mixer on the horizontal plane where the axis is located displays larger flow speed and the second speed sensor on the other side displays smaller flow speed, the setting angle of the axial flow speed regulator is continuously adjusted according to the speed parameter measured by the control system until the speed data transmitted to the control system by the first speed sensor and the second speed sensor is within a set range, and the angle of the axial flow speed regulator is successfully adjusted, wherein:
the adjustment of the setting angle of the axial flow rate regulator is specifically as follows:
lifting the submersible stirring upwards along the guide rod, lifting the axial flow rate regulator to the pool side along with the submersible stirring machine, rotating the wing profile clockwise by a certain angle, fixing the wing profile on the angle regulator by using a positioning pin, putting the wing profile into the pool again for operation, judging whether the regulation of the axial flow rate regulator is successful or not according to the speed parameter transmitted by the speed sensor after the flow field of the biological pool is stable, and if the flow field of the biological pool is not stable, circulating the above regulation operation until the regulation is successful;
and a third mode:
when the first speed sensor on one side of the submersible mixer on the horizontal plane where the axis is located displays that the flow speed is smaller, and the second speed sensor on the other side displays that the flow speed is larger, the control system continuously adjusts the setting angle of the axial flow speed regulator according to the measured speed parameter until the speed data transmitted to the control system by the first speed sensor and the second speed sensor is within a set range, and the angle of the axial flow speed regulator is successfully adjusted, wherein:
the adjustment of the setting angle of the axial flow rate regulator is specifically as follows:
lifting the submersible mixer upwards along the guide rod, lifting the axial flow rate regulator to the pool side along with the submersible mixer, rotating the wing profile in the anticlockwise direction by a certain angle, fixing the wing profile on the angle regulator by using a positioning pin, putting the wing profile into the pool again for operation, judging whether the regulation of the axial flow rate regulator is successful or not according to the speed parameters transmitted by the speed sensor after the flow field of the biological pool is stable, and if the flow field of the biological pool is not stable, circulating the above regulation operation until the regulation is successful.
In the method for accurately controlling the flow field of the biological pond, the flow field of the biological pond is evaluated again according to data measured by the first speed sensor and the second speed sensor at each position when the control method is operated for a period of time or sewage treatment process parameters are changed, the method is adjusted again when the flow speed change of one side of the submersible mixer is large and the deviation range is large, the mixing and sludge suspension effects of each submersible mixer are changed, and the flow field is controlled repeatedly and accurately to ensure that the whole biological pond keeps a certain speed gradient.
The invention has the beneficial effects that:
compared with the prior art, the technical scheme of the invention has the following beneficial effects that speed parameters measured by speed sensors arranged at different positions in the biological pond are transmitted to a control system, the size of the chord line placing angle of the axial flow velocity regulator or the running frequency of the stirrer is determined according to the speed flow fields at different positions of each point in front of the submersible stirrer, and the stirring effect at different positions is enhanced or weakened. When the sewage treatment process parameters of the biological tank are changed, the chord line placing angle of the axial flow velocity regulator is readjusted, the stirring and sludge suspension effects of each stirrer in the axial direction and the two side directions are changed, the flow field is repeatedly and accurately controlled, the speed flow field of the whole biological tank in the axial direction and the two side planes meets the design operation requirements, the flow field is accurately adjusted, the sludge precipitation phenomenon at the bottom of the tank is avoided, the phenomenon of low and uneven sludge concentration under the liquid level is avoided, the activated sludge at different positions is ensured to be in the suspension state all the time, and the normal operation of the biological tank process is ensured.
Drawings
FIG. 1 is a schematic cross-sectional view of a flow field precise control device of a biological pond according to an embodiment of the invention when the flow field precise control device is installed in the biological pond:
FIG. 2 is a schematic view of the axial flow rate regulator of FIG. 1;
FIG. 3 is a schematic view of the swing of the wing profile in the clockwise flow state when the method for accurately controlling the flow field of the biological pond according to the embodiment of the invention is used;
FIG. 4 is a schematic diagram of the swing of the wing-shaped counterclockwise flow state when the method for accurately controlling the flow field of the biological pond is used in the embodiment of the invention;
in the figure: 1-submersible mixer, 11-variable frequency control board, 2-guide rod, 3-control system, 5-axial flow rate regulator, 51-positioning pin, 52-angle regulator, 53-first bearing body, 54-wing type, 541-pressure surface, 542-suction surface, 543-rotating hole and 55-second bearing body.
Detailed Description
Example 1
The precise control device for the flow field of the biological pond provided by the embodiment has a structure shown in figure 1, is used for realizing dynamic precise control on the flow speed of the plane of the biological pond, and is arranged in the biological pond, and comprises a submersible mixer 1, an axial flow speed regulator 5, a guide rod 2, a speed sensor and a control system 3, wherein the control system 3 is commercially available, the control system 3 is arranged on the biological pond, the guide rod 2 is vertically arranged in the biological pond, the submersible mixer 1 is arranged on the guide rod 2 in a sliding manner through the prior art, (the mixer can move up and down along the guide rail in a halt state and is fixed in work), one side of the submersible mixer 1 is provided with a variable frequency control panel 11, the variable frequency control panel 11 is arranged in a junction box of the submersible mixer 1, the biological pond is internally provided with the axial flow speed regulator 5 and the speed sensor, and the axial flow speed regulator 5 is vertically arranged on the submersible mixer 1, axial flow rate regulator 5 sets up at dive mixer 1 through prior art, if through shroud ring and member etc. set up on dive mixer, axial flow rate regulator 5 is located dive mixer 1's dead ahead, wherein:
as shown in fig. 2, the axial flow-rate regulator 5 includes a first bearing body 53, a second bearing body 55, a wing type 54, an angle regulator 52 and a positioning pin 51, the wing type 54 is provided with a rotation hole 543, the first bearing body 53 is provided with the angle regulator 52, one end of the wing type 54 is provided with the second bearing body 55, the other end is provided with the first bearing body 53, the angle regulator 52 is connected with the first bearing body 53, and the wing type 54 is fixedly connected with the angle regulator 52 through the positioning pin 51;
the first speed sensor, the second speed sensor, the variable frequency control board 11 is connected with the control system 3, the first speed sensor, the second speed sensor transmit signals to the control system 3, the placing angle of the axial flow rate regulator 5 can be adjusted according to the speed of each point, the stirring range of the submersible stirrer 1 is adjusted, or the signals are transmitted to the variable frequency control board 11, the running frequency of the submersible stirrer 1 is determined according to the requirement, the running speed of the stirrer is adjusted, thereby the axial thrust of the stirrer is adjusted, the sewage flow rate of the biological pond is changed, and the flow state of the biological pond is improved.
In this embodiment, the number of submersible mixers 1 is at least one.
In the embodiment, the axial installation height of the submersible mixer 1, namely the distance from the submersible mixer to the bottom of the biological pool is 500-1500 mm. In the present embodiment, the axial flow rate regulator 5 is 300 mm and 600mm away from the front end of the impeller of the submersible mixer 1.
In this embodiment, the speed sensor includes a first speed sensor and a second speed sensor which are submerged and arranged in the biological pond, and the first speed sensor and the second speed sensor are symmetrically positioned on two sides of the axis of the submersible mixer 1 and are positioned on the horizontal plane where the axis of the submersible mixer 1 is positioned.
In the embodiment, the number of the speed sensors is 2n, the number of the first speed sensors and the number of the second speed sensors are n respectively, and n is the number of the submersible mixers 1.
In this embodiment, can be equipped with mud concentration sensor in the biological pond as required, mud concentration sensor submergence setting is in biological pond to be located dive mixer both sides, mud concentration sensor quantity is the same with speed sensor quantity, and is connected with control system.
As shown in fig. 3 and 4, the airfoil 54 is formed by enveloping a pressure surface 541 and a suction surface 542, the rotation hole 543 on the airfoil 54 is a penetration hole in the thickness direction of the airfoil 54, and the fluid acts on the pressure receiving surface 541 to form a large rotation force F around the rotation hole 543Press and press，FPress and pressA larger moment M is formed for the rotary hole 543Press and pressThe fluid on the pressure-receiving surface 541 diffuses outwards, so that the stirring range on the side is expanded, the planar flow field range is wider, the suspension effect of the sludge in the plane is ensured, and the process is reliable to operate;
in FIG. 3Clockwise moment M received by pressure surface 541 of airfoil 54Press and pressGreater than the counterclockwise moment M received by the suction surface 542Suction deviceI.e. MPress and press＞MSuction deviceThe wing profile 54 rotates clockwise around the rotation hole 543, and the stirring range and the mixing effect on the suction surface side are enhanced as the wing profile 54 rotates. During the rotation, the original pressure receiving surface 541 becomes the suction surface 542, and the original suction surface 542 becomes the pressure receiving surface 541. Force F acting on new pressure receiving surface 541Press and pressIncrease continuously (moment M)Press and pressIncreasing synchronously) and the force F acting on the new suction surface 542Suction deviceIs constantly decreasing (M)Suction deviceSynchronous decrease) when the moment MPress and press＝MSuction deviceAt this time, the airfoil 54 continues to rotate clockwise under the inertial force until it reaches its limit position. In this extreme position (as shown in fig. 4), the force F of the new pressure receiving surfacePress and pressTo the maximum (M)Press and pressSynchronous), the new suction surface is subjected to a force FSuction deviceTo a minimum (M)Suction deviceSynchronization). The counterclockwise moment M experienced by the pressure surface 541 of the airfoil 54 in FIG. 4Press and pressGreater than the clockwise moment M experienced by the suction surface 542Suction deviceI.e. MPress and press＞MSuction deviceThe wing profile 54 rotates counterclockwise around the rotation hole 543, and with the continuous rotation of the wing profile 54, the stirring range and the mixing effect on the new suction surface side are enhanced. During the rotation, the original pressure receiving surface 541 is restored to the pressure receiving surface 541, and the original suction surface 542 is restored to the suction surface 542. Force F acting on pressure receiving surface 541Press and pressIncrease continuously (moment M)Press and pressIncreasing synchronously) while the force F acting on the suction surface 542 isSuction deviceIs constantly decreasing (M)Suction deviceSynchronous decrease) when the moment MPress and press＝MSuction deviceAt this time, the airfoil 54 continues to rotate counterclockwise by the inertial force until it reaches the limit position. In this extreme position (as shown in FIG. 3), the force F of the pressure receiving surfacePress and pressTo the maximum (M)Press and pressSynchronous), the force F received by the suction surfaceSuction deviceTo a minimum (M)Suction deviceSynchronization).
In the present embodiment, the angle adjuster 52 is used to adjust the chord ampere of the airfoil 54The larger the setting angle beta of the chord line is, the more the pressure surface is directly impacted by the incoming flow, and the pressure F of the pressure surface isPress and pressThe larger the moment M created by the fluid received by the airfoil 54Press and pressThe larger; the suction surface of the airfoil 54 is subjected to a pressure FSuction deviceLess, the airfoil 54 experiences a moment M created by the fluidSuction deviceThe smaller, MPress and pressAnd MSuction deviceThe larger the difference value is, the larger the swing amplitude of the airfoil 54 is, namely the larger the stirring range of the submersible stirrer in a plane is, the flow field in the range is enhanced, and the stirring and uniform mixing and sludge suspension effects are improved.
In the present embodiment, the angle adjuster 52 is used for adjusting the chord line setting angle β of the airfoil 54, and the smaller the chord line setting angle β is, the pressure surface thereof is directly impacted by the incoming flow, and the pressure F thereofPress and pressThe smaller the moment M created by the fluid on the airfoil 54Press and pressThe smaller; the suction surface of the airfoil 54 is subjected to a pressure FSuction deviceThe greater the moment M created by the fluid against which the airfoil 54 is subjectedSuction deviceThe larger, MPress and pressAnd MSuction deviceThe smaller the difference value of the pressure difference value is, the smaller the swing amplitude of the airfoil 54 is, namely the smaller the stirring range of the submersible stirrer in the plane is, the flow field in the range is weakened, and the stirring and uniform mixing and sludge suspension effects are reduced.
In this embodiment, the string placement angle β is adjusted by an angle adjuster 52, the angle adjuster 52 is fixedly disposed at the upper end of the first bearing body 53, the upper end of the angle adjuster 52 includes a positioning hole, the upper end of the airfoil 54 is provided with a plurality of adjusting holes, after the airfoil 54 is rotated clockwise or counterclockwise by a certain angle, the adjusting holes thereon are rotated accordingly, the finally determined adjusting holes on the airfoil 54 are aligned with the positioning hole on the angle adjuster 52, and the airfoil 54 is fixed on the angle adjuster 52 on the first bearing body 53 by a fixing pin 51.
In the present embodiment, after the airfoil 54 is slightly adjusted counterclockwise (adjusted as required), the pressure receiving surface 541 receives the fluid pressure FPress and pressIncreases and the suction surface 542 receives the suction force F of the fluidSuction deviceSlightly reduced, the airfoil 54 is subjected to a moment M created by the fluidPress and pressThe greater the pressure F to which the suction surface of the airfoil 54 is subjectedSuction deviceLess, the airfoil 54 experiences a moment M created by the fluidSuction deviceThe smaller, MPress and pressAnd MSuction deviceThe larger the difference value is, the larger the swing amplitude of the airfoil 54 is, namely the larger the stirring range of the submersible stirrer in a plane is, the flow field in the range is enhanced, and the stirring and uniform mixing and sludge suspension effects are improved.
In the present embodiment, after the airfoil 54 rotates clockwise slightly, the pressure receiving surface 541 receives the fluid pressure FPress and pressDecreases and the suction surface 542 is subjected to the suction force F of the fluidSuction deviceSlightly increased, the airfoil 54 is subjected to a moment M created by the fluidPress and pressThe smaller the pressure F to which the suction surface of the airfoil 54 is subjectedSuction deviceThe greater the moment M created by the fluid against which the airfoil 54 is subjectedSuction deviceThe larger, MPress and pressAnd MSuction deviceThe smaller the difference value is, the smaller the swing amplitude of the airfoil 54 is, namely the smaller the stirring range of the submersible stirrer in a plane is, the flow field in the range is properly weakened, and the tension of the original stirring effect or the flow field with overlarge sludge suspension is properly relieved.
The device is adopted to realize dynamic accurate control of the flow velocity in the flow field of the biological pond, and the method for accurately controlling the flow field of the biological pond specifically comprises the following steps: install biological pond flow field accurate control device in biological pond, biological pond is at the operation in-process, and angular adjustment when dive mixer horizontal direction is fixed, and the flow field in biological pond is stable the back, installs each first velocity transducer and each second velocity transducer under dive mixer both sides liquid level and gives control system with survey data transfer, and operating personnel adjusts dive mixer frequency or axial velocity of flow regulator according to survey data and controls with the convection current field:
the flow velocity of the sewage is controlled to be 0.25m/s to 0.35m/s according to the general regulation in engineering practice, namely the set range of the flow velocity mentioned in the following contents is 0.25m/s to 0.35 m/s;
the first mode is as follows:
when the flow rates displayed by a first speed sensor on one side of the submersible mixer and a second speed sensor on the other side of the submersible mixer on the horizontal plane on which the axis is positioned are simultaneously larger or smaller, the control system determines the running frequency of the submersible mixer according to the measured speed values and controls the running frequency of a motor of the submersible mixer so as to control the flow rate of the fluid and enable the flow rate of the fluid to be in a set range;
and a second mode:
when the first speed sensor on one side of the submersible mixer on the horizontal plane where the axis is located displays larger flow speed and the second speed sensor on the other side displays smaller flow speed, the setting angle of the axial flow speed regulator is continuously adjusted according to the speed parameter measured by the control system until the speed data transmitted to the control system by the first speed sensor and the second speed sensor is within a set range, and the angle of the axial flow speed regulator is successfully adjusted, wherein:
the adjustment of the setting angle of the axial flow rate regulator is specifically as follows:
lifting the submersible mixer upwards along the guide rod, lifting the axial flow rate regulator to the pool side along with the submersible mixer, rotating the wing profile clockwise by a certain angle, fixing the wing profile 54 on the angle regulator 52 by using a positioning pin, putting the wing profile into the pool again for operation, judging whether the regulation of the axial flow rate regulator is successful or not according to the speed parameters transmitted by the speed sensors after the flow field of the biological pool is stable, if the speed data transmitted to the control system 3 by the first speed sensor and the second speed sensor is in the design range, the speed regulation of the axial flow rate regulator 5 is successful, if the flow rate of the first speed sensor received by the control system 3 is still larger, and the speed data displayed by the second speed sensor is still smaller, continuously regulating the angle of the wing profile 54 clockwise until the speed is accurately controlled in the design range;
and a third mode:
when the first speed sensor on one side of the submersible mixer on the horizontal plane where the axis is located displays that the flow speed is smaller, and the second speed sensor on the other side displays that the flow speed is larger, the control system continuously adjusts the setting angle of the axial flow speed regulator according to the measured speed parameter until the speed data transmitted to the control system by the first speed sensor and the second speed sensor is within a set range, and the angle of the axial flow speed regulator is successfully adjusted, wherein:
the adjustment of the setting angle of the axial flow rate regulator is specifically as follows:
lifting the submersible mixer upwards along the guide rod, lifting the axial flow rate regulator to the pool side along with the submersible mixer, rotating the wing profile in the anticlockwise direction by a certain angle, fixing the wing profile on the angle regulator by using a positioning pin, putting the wing profile into the pool again for running, judging whether the regulation of the axial flow rate regulator is successful or not according to the speed parameters transmitted by the speed sensor after the flow field of the biological pool is stable, if the speed data transmitted to the control system by the first speed sensor and the second speed sensor is within the design range, the speed regulation of the axial flow rate regulator is successful, if the first speed sensor received by the control system 3 is still small in flow rate and the second speed sensor is still large in flow rate, continuously regulating the angle of the wing profile 54 anticlockwise until the flow field speed is accurately controlled within the design range.
The control method runs for a period of time according to the actual condition or when the sewage treatment process parameters are changed, according to the data measured by the first speed sensor and the second speed sensor at each position, or the suspension state (concentration) of the activated sludge is judged according to the sludge concentration sensors arranged at each point, re-evaluating the flow field of the biological pool, when the flow velocity change of one side of the submersible mixer is large, the range deviating from the working condition (the flow velocity of sewage is 0.25 m/s-0.35 m/s) is large, and the flow velocity is set to be lower than the lower limit and higher than the upper limit by 10 percent, readjusting according to the method to change the stirring and sludge suspension effects of each submersible stirrer, the flow field is repeatedly and accurately controlled, so that the whole biological pond keeps a certain speed gradient, no dead angle is ensured, the activated sludge is ensured to be in a suspension state, and the normal operation of the biological pond process is ensured.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (9)

1. The utility model provides a biological pond flow field accurate control device, sets up in biological pond, its characterized in that: including dive mixer (1), axial velocity of flow regulator (5), guide arm (2), speedtransmitter and control system (3), control system (3) set up on biological pond, guide arm (2) are vertical to be set up in biological pond, dive mixer (1) slides and sets up on guide arm (2), one side of dive mixer (1) is equipped with variable frequency control board (11), is equipped with in the biological pond axial velocity of flow regulator (5) and speedtransmitter, axial velocity of flow regulator (5) vertical set up in on dive mixer (1), axial velocity of flow regulator (5) are located dive mixer (1) the dead ahead, wherein:
the axial flow velocity regulator (5) comprises a first bearing body (53), a second bearing body (55), an airfoil (54), an angle regulator (52) and a positioning pin (51), wherein a rotating hole (543) is formed in the airfoil (54), the angle regulator (52) is arranged on the first bearing body (53), the second bearing body (55) is arranged at one end of the airfoil (54), the first bearing body (53) is arranged at the other end of the airfoil (54), the angle regulator (52) is connected with the first bearing body (53), and the airfoil (54) is fixedly connected with the angle regulator (52) through the positioning pin (51);
the speed sensor and the variable frequency control panel (11) are connected with the control system (3).
2. The accurate control device for the flow field of the biological pond according to claim 1, wherein: the number of the submersible mixers (1) is at least one.
3. The accurate control device for the flow field of the biological pond according to claim 1, wherein: the axial installation height of the submersible mixer (1), namely the distance from the submersible mixer to the bottom of the biological pool is 500mm and 1500 mm.
4. The accurate control device for the flow field of the biological pond according to claim 1, wherein: the axial flow rate regulator (5) is 300 mm and 600mm away from the front end of the impeller of the submersible mixer (1).
5. The accurate control device for the flow field of the biological pond according to claim 1, wherein: the speed sensor comprises a first speed sensor and a second speed sensor which are arranged in the biological pond in a submerged mode, and the first speed sensor and the second speed sensor are symmetrically located on two sides of the axis of the submersible mixer (1) and located on the horizontal plane where the axis is located.
6. The accurate control device for the flow field of the biological pond according to claim 5, wherein: the number of the speed sensors is 2n, the number of the first speed sensors and the number of the second speed sensors are n respectively, and n is the number of the submersible mixers (1).
7. The accurate control device for the flow field of the biological pond according to claim 1, wherein: the airfoil profile (54) is formed by enveloping a pressure surface (541) and a suction surface (542), and the rotating hole (543) in the airfoil profile (54) is a penetrating hole in the thickness direction of the airfoil profile (54).
8. A method for accurately controlling a flow field of a biological pond based on the device of any one of claims 1-7, wherein the method comprises the following steps: install biological pond flow field accurate control device in biological pond, biological pond is at the operation in-process, and angular adjustment when dive mixer horizontal direction is fixed, and the flow field in biological pond is stable the back, installs each first velocity transducer and each second velocity transducer under dive mixer both sides liquid level and gives control system with survey data transfer, and operating personnel adjusts dive mixer frequency or axial velocity of flow regulator according to survey data and controls with the convection current field:
the first mode is as follows:
when the flow rates displayed by a first speed sensor on one side of the submersible mixer and a second speed sensor on the other side of the submersible mixer on the horizontal plane on which the axis is positioned are simultaneously larger or smaller, the control system determines the running frequency of the submersible mixer according to the measured speed values and controls the running frequency of a motor of the submersible mixer so as to control the flow rate of the fluid and enable the flow rate of the fluid to be in a set range;
and a second mode:
when the first speed sensor on one side of the submersible mixer on the horizontal plane where the axis is located displays larger flow speed and the second speed sensor on the other side displays smaller flow speed, the setting angle of the axial flow speed regulator is continuously adjusted according to the speed parameter measured by the control system until the speed data transmitted to the control system by the first speed sensor and the second speed sensor is within a set range, and the angle of the axial flow speed regulator is successfully adjusted, wherein: the adjustment of the setting angle of the axial flow rate regulator is specifically as follows:
lifting the submersible stirring upwards along the guide rod, lifting the axial flow rate regulator to the pool side along with the submersible stirring machine, rotating the wing profile clockwise by a certain angle, fixing the wing profile on the angle regulator by using a positioning pin, putting the wing profile into the pool again for operation, judging whether the regulation of the axial flow rate regulator is successful or not according to the speed parameter transmitted by the speed sensor after the flow field of the biological pool is stable, and if the flow field of the biological pool is not stable, circulating the above regulation operation until the regulation is successful;
and a third mode:
when the first speed sensor on one side of the submersible mixer on the horizontal plane where the axis is located displays that the flow speed is smaller, and the second speed sensor on the other side displays that the flow speed is larger, the control system continuously adjusts the setting angle of the axial flow speed regulator according to the measured speed parameter until the speed data transmitted to the control system by the first speed sensor and the second speed sensor is within a set range, and the angle of the axial flow speed regulator is successfully adjusted, wherein: the adjustment of the setting angle of the axial flow rate regulator is specifically as follows:
lifting the submersible mixer upwards along the guide rod, lifting the axial flow rate regulator to the pool side along with the submersible mixer, rotating the wing profile in the anticlockwise direction by a certain angle, fixing the wing profile on the angle regulator by using a positioning pin, putting the wing profile into the pool again for operation, judging whether the regulation of the axial flow rate regulator is successful or not according to the speed parameters transmitted by the speed sensor after the flow field of the biological pool is stable, and if the flow field of the biological pool is not stable, circulating the above regulation operation until the regulation is successful.
9. The accurate control method of the flow field of the biological pond according to claim 8, wherein: when the control method runs for a period of time or the sewage treatment process is changed, the flow field of the biological pond is evaluated again according to the data measured by the first speed sensor and the second speed sensor at each position, when the flow speed change of one side of the submersible mixer is large and the deviation range from the working condition is large, the adjustment is carried out again according to the method, the mixing and sludge suspension effects of each submersible mixer are changed, the flow field is controlled repeatedly and accurately, and the whole biological pond is kept at a certain speed gradient.
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