CN113213646A - Blower control device and control method for sewage treatment system - Google Patents
Blower control device and control method for sewage treatment system Download PDFInfo
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- CN113213646A CN113213646A CN202110475427.7A CN202110475427A CN113213646A CN 113213646 A CN113213646 A CN 113213646A CN 202110475427 A CN202110475427 A CN 202110475427A CN 113213646 A CN113213646 A CN 113213646A
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- 239000010865 sewage Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005273 aeration Methods 0.000 claims abstract description 166
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 132
- 239000001301 oxygen Substances 0.000 claims abstract description 132
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 132
- 230000001105 regulatory effect Effects 0.000 claims abstract description 36
- 230000001276 controlling effect Effects 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims description 52
- 230000000694 effects Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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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
- C02F7/00—Aeration of stretches of water
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/38—Gas flow rate
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- 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
Abstract
The invention discloses a sewage treatment system blower control device and a control method, relating to the technical field of sewage treatment system blower control and comprising the following steps: the output ends of the blowers are connected with a main pipeline through an output pipeline, and a pressure transmitter is arranged on the main pipeline; the air blower controller is electrically connected with the air blowers; one ends of the branch pipelines are connected with the main pipeline, and the other ends of the branch pipelines are respectively connected with the aeration tanks; a plurality of intake air regulating valves respectively provided on the plurality of branch lines; the online dissolved oxygen meters are respectively arranged in the aeration tanks; the main control unit is electrically connected with the pressure transmitter, the blower controller, the plurality of air inlet regulating valves and the plurality of online dissolved oxygen meters, and the main control unit is used for controlling the operation of the plurality of blowers through the blower controller according to the opening degrees of the plurality of air inlet regulating valves and the dissolved oxygen concentration measured by the plurality of online dissolved oxygen meters.
Description
Technical Field
The invention belongs to the technical field of sewage treatment system blower control, and particularly relates to a sewage treatment system blower control device and a control method.
Background
With the continuous improvement of the water quality requirement of effluent water of a sewage treatment plant, the upgrading and reconstruction of the water plant are urgent, wherein the quality of dissolved oxygen control influences the quality of the denitrification and dephosphorization effect of the biological denitrification and dephosphorization process. The control of dissolved oxygen is mainly obtained through an accurate aeration system, and the dissolved oxygen needs to be in linkage operation with an air blower system, so that the stable control of the dissolved oxygen in the biological pond is realized. The main control system (MCP) of the blower receives two signals, one is a pressure signal, and the other is a gas flow signal. How to give blower owner control system with accurate control signal through accurate aeration system to make each air-blower according to control signal automatic adjustment running state, satisfy biological pond dissolved oxygen demand, this has very big influence to the accurate aeration system steady operation of sewage treatment plant and realization energy saving and consumption reduction. The existing blower control system has the defects of inaccurate control of the output pressure of the blower and poor energy-saving effect.
Disclosure of Invention
The invention aims to provide a blower control device and a control method of a sewage treatment system, aiming at the defects in the prior art, the control device can monitor the air inlet flow, the dissolved oxygen concentration and the output pressure of blowers in a plurality of aeration tanks, and a main controller can control the operation of a plurality of blowers according to the opening degrees of a plurality of air inlet regulating valves and the dissolved oxygen concentration measured by a plurality of online dissolved oxygen meters, so that the accurate control of the output pressure of the blowers is realized, the dissolved oxygen requirement of a biological tank is met, and the energy-saving effect is improved.
In order to achieve the above object, the present invention provides a blower control apparatus for a sewage treatment system including a plurality of biological tanks, each of which is provided with at least one non-aeration tank and a plurality of aeration tanks, the apparatus comprising:
the output ends of the blowers are connected with a main pipeline through an output pipeline, and a pressure transmitter is arranged on the main pipeline;
the air blower controller is electrically connected with the air blowers;
one ends of the branch pipelines are connected with the main pipeline, and the other ends of the branch pipelines are respectively connected with the aeration tanks;
a plurality of intake air adjusting valves respectively provided on the plurality of branch lines;
the online dissolved oxygen meters are respectively arranged in the aeration tanks;
the main control unit, with pressure transmitter air-blower controller, a plurality of admit air governing valve and a plurality of online dissolved oxygen appearance electric connection, main control unit is used for the basis a plurality of openness and a plurality of governing valve admit air the dissolved oxygen concentration that online dissolved oxygen appearance surveyed, through air-blower controller control is a plurality of the operation of air-blower.
Optionally, the system further comprises a plurality of gas flow meters, and the plurality of gas flow meters are respectively arranged on the plurality of branch pipelines.
Optionally, the plurality of gas flow meters are electrically connected to the main controller, and the main controller is configured to control the opening of the plurality of gas inlet adjusting valves according to the gas flow measured by the plurality of gas flow meters and the dissolved oxygen concentration measured by the plurality of online dissolved oxygen meters.
Optionally, the main controller includes a first calculation module and a second calculation module, the first calculation module is configured to calculate an actual dissolved oxygen mean value according to a plurality of dissolved oxygen concentrations measured by the online dissolved oxygen meters, and calculate a first difference between a set dissolved oxygen mean value and the actual dissolved oxygen mean value, and the second calculation module is configured to calculate an actual opening mean value according to opening degrees of the plurality of intake air regulating valves, and calculate a second difference between the set opening mean value and the actual opening mean value.
Optionally, the gas flow measured by the gas flow meter is used as an actual aeration amount, and the main controller further comprises a third calculation module, wherein the third calculation module is used for calculating a required aeration amount according to the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters, and calculating a third difference value between the required aeration amount and the actual aeration amount.
The invention also provides a sewage treatment system blower control method, which utilizes the sewage treatment system blower control device and comprises the following steps:
acquiring actual dissolved oxygen values in a plurality of aeration tanks and actual opening values of air inlet regulating valves of the plurality of aeration tanks;
calculating actual mean values of dissolved oxygen in a plurality of aeration tanks and actual mean values of opening degrees of a plurality of air inlet adjusting valves;
setting a set dissolved oxygen mean value and a set opening mean value of a plurality of aeration tanks;
and controlling the operation of the plurality of blowers according to a first difference value between the set dissolved oxygen mean value and the actual dissolved oxygen mean value and a second difference value between the set opening degree mean value and the actual opening degree mean value.
Optionally, the method further comprises:
acquiring the air inlet flow of a plurality of aeration tanks as the actual aeration quantity of the plurality of aeration tanks;
calculating the required aeration amount of a plurality of aeration tanks according to the actual dissolved oxygen values in the aeration tanks;
and controlling the opening degrees of the air inlet regulating valves of the aeration tanks according to the actual aeration quantity and the required aeration quantity.
Optionally, the controlling the operation of the plurality of blowers according to the first difference between the set dissolved oxygen mean value and the actual dissolved oxygen mean value and the second difference between the set opening degree mean value and the actual opening degree mean value comprises:
setting a first threshold value and a second threshold value;
comparing the first difference and the second difference with the first threshold and the second threshold, respectively, and controlling the output pressures of the plurality of blowers to increase when the first difference is greater than the upper limit value of the first threshold and the second difference is less than the lower limit value of the second threshold; and controlling the output pressures of the plurality of blowers to decrease when the first difference is smaller than a lower limit value of the first threshold and the second difference is larger than an upper limit value of the second threshold.
Optionally, the controlling the opening degree of the air intake adjusting valve of the plurality of aeration tanks according to the actual aeration amount and the required aeration amounts of the plurality of aeration tanks comprises:
setting a third threshold value;
calculating a third difference between the required aeration amount and the actual aeration amount;
and comparing the third difference value with the third threshold value, and adjusting the opening degrees of the plurality of air inlet adjusting valves to enable the third difference value to be within the third threshold value range.
Optionally, the method further comprises a set interval time length, and the operation of the plurality of blowers is controlled according to a first difference value between the set dissolved oxygen mean value and the actual dissolved oxygen mean value and a second difference value between the set opening degree mean value and the actual opening degree mean value after each set time length.
The invention provides a blower control device and a blower control method for a sewage treatment system, which have the beneficial effects that:
1. the control device can monitor the air inlet flow, the dissolved oxygen concentration and the output pressure of the blowers in the aeration tanks, the main controller can control the operation of the blowers through the blower controller according to the opening degrees of the air inlet regulating valves and the dissolved oxygen concentration measured by the online dissolved oxygen meters, the accurate control of the output pressure of the blowers is realized, the dissolved oxygen requirement of the biological tanks is met, and the energy-saving effect is improved;
2. the control device is also provided with a plurality of gas flow meters, the gas flow rates of the aeration tanks can be monitored in real time, the main controller can control the opening degrees of the plurality of gas inlet adjusting valves according to the gas flow rates measured by the plurality of gas flow meters and the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters, and the opening degrees of the plurality of gas inlet adjusting valves are adjusted in real time, so that the dissolved oxygen concentrations in the aeration tanks always meet the aeration requirements;
3. the control method can control the output pressure of the air blower and the air supply flow of each aeration tank by using the control device, and can also combine the two control lines, intermittently control the output pressure of the air blower while adjusting the air supply flow of each aeration tank in real time, improve the control effect and improve the energy-saving effect.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic configuration diagram of a sewage treatment system blower control apparatus according to an embodiment of the present invention.
FIG. 2 shows a flow chart of a sewage treatment system blower control method according to an embodiment of the present invention.
Description of reference numerals:
1. an aeration tank; 2. an online dissolved oxygen instrument; 3. a gas flow meter; 4. an air inlet regulating valve; 5. a pressure transmitter; 6. a main controller; 7. a blower controller; 8. a blower.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a blower control device of a sewage treatment system, the sewage treatment system comprises a plurality of biological tanks, each biological tank is internally provided with at least one non-aeration tank and a plurality of aeration tanks, the device comprises:
the output ends of the blowers are connected with a main pipeline through an output pipeline, and a pressure transmitter is arranged on the main pipeline;
the air blower controller is electrically connected with the air blowers;
one ends of the branch pipelines are connected with the main pipeline, and the other ends of the branch pipelines are respectively connected with the aeration tanks;
a plurality of intake air regulating valves respectively provided on the plurality of branch lines;
the online dissolved oxygen meters are respectively arranged in the aeration tanks;
the main control unit is electrically connected with the pressure transmitter, the blower controller, the plurality of air inlet regulating valves and the plurality of online dissolved oxygen meters, and the main control unit is used for controlling the operation of the plurality of blowers through the blower controller according to the opening degrees of the plurality of air inlet regulating valves and the dissolved oxygen concentration measured by the plurality of online dissolved oxygen meters.
Specifically, each aeration tank is provided with 1 online dissolved oxygen meter for measuring the concentration of dissolved oxygen in the aeration tank; an electric air inlet adjusting valve is arranged on a branch pipeline entering each aeration tank and used for controlling the flow rate of the air entering the aeration tank; configuring a plurality of blowers, configuring a blower controller (MCP), and arranging a pressure transmitter on a main pipeline of the air outlet of the blowers for measuring the gas pressure of the main pipeline; the main controller is configured with a pressure transmitter, and signals of the online dissolved oxygen meters and the air inlet regulating valves of all the biological tanks are transmitted to the main controller, the main controller outputs control signals to the blower controller, and the blower controller controls the running state (the opening degree of inlet and outlet guide vanes) of all the blowers in the system through the received control signals, so that the output pressure of the blowers can be controlled, and can be measured by the pressure transmitter.
Optionally, a plurality of gas flow meters are further included, and the plurality of gas flow meters are respectively disposed on the plurality of branch pipelines.
Specifically, a gas flow meter is arranged on a branch line entering each aeration tank and is used for measuring the gas flow entering the aeration tank.
Optionally, the plurality of gas flow meters are electrically connected to a main controller, and the main controller is configured to control the opening of the plurality of gas inlet regulating valves according to the gas flow measured by the plurality of gas flow meters and the dissolved oxygen concentration measured by the plurality of online dissolved oxygen meters.
Specifically, the flow rate of the gas in the branch pipelines can be controlled by controlling the opening degrees of the air inlet adjusting valves, so that the air supply amount can meet the required aeration amount of the aeration tank.
Optionally, the main controller includes a first calculation module and a second calculation module, the first calculation module is configured to calculate an actual dissolved oxygen mean value according to dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters and calculate a first difference between the set dissolved oxygen mean value and the actual dissolved oxygen mean value, and the second calculation module is configured to calculate an actual opening mean value according to openings of the plurality of intake air regulating valves and calculate a second difference between the set opening mean value and the actual opening mean value.
Specifically, a first threshold value and a second threshold value can be set in the main controller and are respectively used for comparing with the first difference value and the second difference value, and the difference between the set dissolved oxygen average value and the actual dissolved oxygen average value and the difference between the set opening degree average value and the actual opening degree average value in the aeration tank can be reflected according to the comparison result, so that the output pressure of the air blower is controlled.
Optionally, the gas flow measured by the gas flow meter is used as the actual aeration amount, and the main controller further comprises a third calculation module for calculating the required aeration amount according to the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters and calculating a third difference between the required aeration amount and the actual aeration amount.
Specifically, a third threshold value can be set in the main controller and used for comparing with a third difference value, the difference between the required aeration quantity and the actual aeration quantity in the aeration tank can be reflected according to the comparison result, the opening degree of the air inlet regulating valve is controlled accordingly, and sufficient air supply quantity can be obtained in the aeration tank.
The invention also provides a sewage treatment system blower control method, which utilizes the sewage treatment system blower control device and comprises the following steps:
acquiring actual dissolved oxygen values in the aeration tanks and actual opening values of air inlet regulating valves of the aeration tanks;
calculating the actual dissolved oxygen mean values in the aeration tanks and the actual opening degree mean values of the air inlet regulating valves;
setting a set dissolved oxygen mean value and a set opening mean value of a plurality of aeration tanks;
and controlling the operation of the plurality of blowers according to a first difference value between the set dissolved oxygen average value and the actual dissolved oxygen average value and a second difference value between the set opening degree average value and the actual opening degree average value.
Specifically, the first difference and the second difference can be calculated by a first calculation module and a second calculation module in the main controller respectively, and the output pressure of the blower is controlled by using the first difference and the second difference, so that the output pressure of the blower is adjusted to a proper state while the dissolved oxygen concentration and the air supply flow meet the use requirements, and the energy-saving effect of the blower is facilitated; the system gradually adjusts the output pressure of the air blower according to the current conditions, ensures the stability of a gas pipeline, and avoids the phenomenon of surge of the air blower caused by the reasons of pressure building and the like.
Optionally, the method further comprises:
acquiring the air inlet flow of the aeration tanks as the actual aeration quantity of the aeration tanks;
calculating the required aeration amount of the aeration tanks according to the actual dissolved oxygen values in the aeration tanks;
and controlling the opening of the air inlet regulating valves of the aeration tanks according to the actual aeration quantity and the required aeration quantity.
Specifically, the opening degree of the air inlet regulating valves of the aeration tanks is controlled according to the actual aeration quantity and the required aeration quantity of the aeration tanks, so that the actual air supply quantity in the aeration tanks can always meet the required aeration quantity of the aeration tanks, and the stable operation of the sewage denitrification and dephosphorization process is ensured; what adjust here is that the air feed flow of air-blower to aeration tank air feed, combines the regulation here with the regulation of above-mentioned air-blower output pressure, carries out the double-line and adjusts simultaneously, can realize that air-blower control system and the accurate aeration system of biological pond linkage operation, realizes that aeration tank dissolved oxygen concentration stable control is within 20% of the setting value, effectively ensures the stable operation of sewage nitrogen and phosphorus removal technology.
Optionally, controlling the operation of the plurality of blowers according to a first difference between the set dissolved oxygen mean value and the actual dissolved oxygen mean value and a second difference between the set opening degree mean value and the actual opening degree mean value comprises:
setting a first threshold value and a second threshold value;
comparing the first difference and the second difference with a first threshold and a second threshold, respectively, and controlling the output pressures of the plurality of blowers to increase when the first difference is greater than an upper limit value of the first threshold and the second difference is less than a lower limit value of the second threshold; when the first difference is smaller than a lower limit value of a first threshold value and the second difference is larger than an upper limit value of a second threshold value, the output pressures of the plurality of blowers are controlled to be reduced.
Specifically, pressure transmitter can measure the pressure value on the main line, regards this value as the initial pressure value of air-blower, for the output pressure of accurate control air-blower, revises initial pressure value, and the revision process is as follows: comparing the first difference and the second difference with a first threshold and a second threshold, respectively, and controlling the output pressures of the plurality of blowers to increase when the first difference is greater than an upper limit value of the first threshold and the second difference is less than a lower limit value of the second threshold; when the first difference value is smaller than the lower limit value of the first threshold value and the second difference value is larger than the upper limit value of the second threshold value, controlling the output pressure of the blowers to be reduced, otherwise, keeping the initial pressure value unchanged; and transmitting the corrected pressure value to a blower controller (MCP), and automatically adjusting the running state (such as the opening degree of inlet and outlet guide vanes) of each blower in the system by the blower controller according to the received control signal to enable the pressure of the main gas pipeline to reach the set pressure value.
Alternatively, controlling the opening degree of the air intake adjusting valve of the plurality of aeration tanks according to the actual aeration amount and the required aeration amounts of the plurality of aeration tanks includes:
setting a third threshold value;
calculating a third difference value between the required aeration amount and the actual aeration amount;
and comparing the third difference value with a third threshold value, and adjusting the opening degrees of the plurality of air inlet adjusting valves to enable the third difference value to be within the third threshold value range.
Specifically, the third difference value can be calculated by the third calculation module, and the opening degree of the air inlet valve is adjusted by the third difference value, so that the air supply flow of the air blower to the aeration tank meets the aeration requirement of the aeration tank, and accurate control is achieved.
Optionally, the method further comprises setting an interval time length, and controlling the operation of the plurality of blowers according to a first difference value between the set dissolved oxygen average value and the actual dissolved oxygen average value and a second difference value between the set opening degree average value and the actual opening degree average value after each set time length.
Specifically, the interval duration can be set to be 2 hours, and the operation of the plurality of air blowers is controlled once every two hours according to the first difference value between the set dissolved oxygen average value and the actual dissolved oxygen average value and the second difference value between the set opening degree average value and the actual opening degree average value, so that the timely regulation and control effect can be achieved, frequent control actions can be avoided, and the service life can be ensured.
Examples
As shown in fig. 1 and 2, the present invention provides a blower control device for a sewage treatment system including a plurality of biological tanks, each of which is provided with at least one non-aeration tank and a plurality of aeration tanks 1, the device comprising:
the output ends of the blowers 8 are connected with a main pipeline through an output pipeline, and a pressure transmitter 5 is arranged on the main pipeline;
a blower controller 7 electrically connected to the plurality of blowers 8;
one ends of the branch pipelines are connected with the main pipeline, and the other ends of the branch pipelines are respectively connected with the aeration tanks 1;
a plurality of intake air adjusting valves 4 provided on the plurality of branch lines, respectively;
a plurality of online dissolved oxygen meters 2 respectively arranged in the plurality of aeration tanks 1;
and the main controller 6 is electrically connected with the pressure transmitter 5, the blower controller 7, the plurality of air inlet regulating valves 4 and the plurality of online dissolved oxygen meters 2, and is used for controlling the operation of the plurality of blowers 8 through the blower controller 7 according to the opening degrees of the plurality of air inlet regulating valves 4 and the dissolved oxygen concentration measured by the plurality of online dissolved oxygen meters 2.
In the present embodiment, a plurality of gas flow meters 3 are further included, and the plurality of gas flow meters 3 are respectively provided on the plurality of branch lines.
In the present embodiment, the plurality of gas flow meters 3 are electrically connected to a main controller 6, and the main controller 6 is configured to control the opening degrees of the plurality of gas inlet regulating valves 4 according to the gas flow rates measured by the plurality of gas flow meters 3 and the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters 2.
In this embodiment, the main controller 6 includes a first calculation module configured to calculate an actual dissolved oxygen mean value according to the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters 2 and calculate a first difference between the set dissolved oxygen mean value and the actual dissolved oxygen mean value, and a second calculation module configured to calculate an actual opening mean value according to the openings of the plurality of intake air regulating valves 4 and calculate a second difference between the set opening mean value and the actual opening mean value.
In this embodiment, the gas flow measured by the gas flow meter 3 is used as the actual aeration amount, and the main controller 6 further includes a third calculation module for calculating the required aeration amount according to the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters 2, and calculating a third difference between the required aeration amount and the actual aeration amount.
The invention also provides a sewage treatment system blower control method, which utilizes the sewage treatment system blower control device and comprises the following steps:
acquiring actual dissolved oxygen values in the aeration tanks and actual opening values of air inlet regulating valves of the aeration tanks;
calculating the actual dissolved oxygen mean values in the aeration tanks and the actual opening degree mean values of the air inlet regulating valves;
setting a set dissolved oxygen mean value and a set opening mean value of a plurality of aeration tanks;
and controlling the operation of the plurality of blowers according to a first difference value between the set dissolved oxygen average value and the actual dissolved oxygen average value and a second difference value between the set opening degree average value and the actual opening degree average value.
In this embodiment, the method further includes:
acquiring the air inlet flow of a plurality of aeration tanks and taking the air inlet flow as the actual aeration quantity of the plurality of aeration tanks;
calculating the required aeration amount of the aeration tanks according to the actual dissolved oxygen values in the aeration tanks;
and controlling the opening of the air inlet regulating valves of the aeration tanks according to the actual aeration quantity and the required aeration quantity.
In the present embodiment, controlling the operation of the plurality of blowers according to a first difference between the set dissolved oxygen mean value and the actual dissolved oxygen mean value and a second difference between the set opening mean value and the actual opening mean value includes:
setting a first threshold value and a second threshold value;
comparing the first difference and the second difference with a first threshold and a second threshold, respectively, and controlling the output pressures of the plurality of blowers to increase when the first difference is greater than an upper limit value of the first threshold and the second difference is less than a lower limit value of the second threshold; when the first difference is smaller than a lower limit value of a first threshold value and the second difference is larger than an upper limit value of a second threshold value, the output pressures of the plurality of blowers are controlled to be reduced.
In this embodiment, controlling the opening of the air intake regulating valve of the plurality of aeration tanks according to the actual aeration amount and the required aeration amounts of the plurality of aeration tanks includes:
setting a third threshold value;
calculating a third difference value between the required aeration amount and the actual aeration amount;
and comparing the third difference value with a third threshold value, and adjusting the opening degrees of the plurality of air inlet adjusting valves to enable the third difference value to be within the third threshold value range.
In the embodiment, the method further comprises the step of setting the interval time length, and controlling the operation of the plurality of blowers according to a first difference value between the set dissolved oxygen average value and the actual dissolved oxygen average value and a second difference value between the set opening degree average value and the actual opening degree average value after each set time length.
In summary, when the blower control method for a sewage treatment system according to the present invention is implemented, the blower control device for a sewage treatment system is used, and an embodiment is as follows: the sewage enters more than 4 groups of biological tanks, each group of biological tanks is provided with 1 non-aeration tank and more than 4 aeration tanks 1, and each aeration tank 1 is provided with 1 online dissolved oxygen meter 2 for measuring the concentration of dissolved oxygen in the aeration tank 1; an electric air inlet adjusting valve 4 is arranged on a branch pipeline entering each aeration tank 1 and is used for controlling the air flow entering the aeration tank 1; a gas flow meter 3 is arranged on a branch pipeline entering each aeration tank 1 and is used for measuring the gas flow entering the aeration tank; more than 4 blowers 8 are configured, a blower controller 7(MCP) is configured, and a pressure transmitter 5 is arranged on a main pipeline at the air outlet of the blowers 8 and used for measuring the gas pressure of the main pipeline; a main controller 6 is configured, signals of a pressure transmitter 5, an online dissolved oxygen meter 2 of each biological pond, a gas flowmeter 3 and an air inlet regulating valve 4 are transmitted to the main controller 6, the main controller 6 outputs control signals to an air blower controller 7, and the air blower controller 7 controls the running state (the opening degree of inlet and outlet guide vanes) of each air blower 8 in the system through the received control signals.
The blower control device of the sewage treatment system is started, DO concentration (dissolved oxygen concentration) in each aeration tank is obtained in real time, according to a third calculation module, aeration quantity G required by each aeration tank is calculated, an air inlet adjusting valve 4 of each aeration tank is used as an actuator, air inflow measured by comparing a gas flowmeter 3 arranged in each aeration tank 1 is used as actual aeration quantity, the difference value between the required aeration quantity and the actual aeration quantity is recorded as delta G as a third difference value, a third threshold value is set to be +/-3% G, and the valve opening of the air inlet adjusting valve 4 is automatically adjusted, so that the third difference value is always within the range of the third threshold value.
Acquiring a numerical value of a pressure transmitter 5 every 2 hours as a set pressure value P of a blower 8, acquiring actual dissolved oxygen values and actual opening values in all aeration tanks 1, calculating an actual dissolved oxygen mean value D, and calculating an actual opening mean value W; setting the mean value of the dissolved oxygen to be 2.5mg/L, and subtracting the set mean value of the dissolved oxygen from the actual mean value D of the dissolved oxygen to obtain a first difference value delta D, and setting a first threshold value to be +/-5% D; setting the set opening mean value of all the air inlet regulating valves to be 65%, namely opening to the mean 65%, subtracting the set opening mean value from the actual opening mean value W to obtain a second difference value delta W, and setting a second threshold value to be +/-5% W; simultaneously comparing the first difference value with a first threshold value and the second difference value with a second threshold value, and if the first difference value is larger than the upper limit of the first threshold value and the second difference value is smaller than the lower limit of the second threshold value, increasing the set pressure P by 0.05 bar; if the first difference is smaller than the first lower threshold limit and the second difference is larger than the second upper threshold limit, the set pressure P is reduced by 0.04 bar; otherwise, the set pressure P is kept unchanged. And transmitting the corrected set pressure to a blower controller 7(MCP), and automatically adjusting the running state (such as the opening degree of inlet and outlet guide vanes) of each blower 8 in the system by the blower controller 7 according to the received control signal to enable the pressure of the main pipeline to reach a required pressure value.
By the device and the method, the linkage operation of the air blower system and the accurate aeration system can be realized, the stable change of the pressure of the gas pipeline is kept, the stable operation of the air blower 8 is ensured, and meanwhile, the concentration of dissolved oxygen in the aeration tank 1 is maintained in a constant range, so that the system achieves the efficient denitrification and dephosphorization effect.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A blower control apparatus for a sewage treatment system including a plurality of biological tanks, each of the biological tanks having at least one non-aeration tank and a plurality of aeration tanks disposed therein, the apparatus comprising:
the output ends of the blowers are connected with a main pipeline through an output pipeline, and a pressure transmitter is arranged on the main pipeline;
the air blower controller is electrically connected with the air blowers;
one ends of the branch pipelines are connected with the main pipeline, and the other ends of the branch pipelines are respectively connected with the aeration tanks;
a plurality of intake air adjusting valves respectively provided on the plurality of branch lines;
the online dissolved oxygen meters are respectively arranged in the aeration tanks;
the main control unit, with pressure transmitter air-blower controller, a plurality of admit air governing valve and a plurality of online dissolved oxygen appearance electric connection, main control unit is used for the basis a plurality of openness and a plurality of governing valve admit air the dissolved oxygen concentration that online dissolved oxygen appearance was surveyed passes through air-blower controller control is a plurality of the operation of air-blower.
2. The sewage treatment system blower control device according to claim 1, further comprising a plurality of gas flow meters provided on the plurality of branch lines, respectively.
3. The sewage treatment system blower control device of claim 2, wherein a plurality of the gas flow meters are electrically connected to the main controller, and the main controller is configured to control the opening degrees of the plurality of inlet gas regulating valves according to the gas flow rates measured by the plurality of the gas flow meters and the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters.
4. The sewage treatment system blower control device according to claim 1, wherein the main controller includes a first calculation module for calculating an actual dissolved oxygen mean value from dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters and calculating a first difference value between a set dissolved oxygen mean value and the actual dissolved oxygen mean value, and a second calculation module for calculating an actual opening degree mean value from opening degrees of the plurality of intake air regulating valves and calculating a second difference value between the set opening degree mean value and the actual opening degree mean value.
5. The sewage treatment system blower control device according to claim 2, wherein the gas flow measured by the gas flow meter is used as an actual aeration amount, and the main controller further comprises a third calculation module for calculating a required aeration amount from the dissolved oxygen concentrations measured by the plurality of online dissolved oxygen meters, and calculating a third difference between the required aeration amount and the actual aeration amount.
6. A sewage treatment system blower control method using the sewage treatment system blower control apparatus according to any one of claims 1 to 5, characterized by comprising:
acquiring actual dissolved oxygen values in a plurality of aeration tanks and actual opening values of air inlet regulating valves of the plurality of aeration tanks;
calculating actual mean values of dissolved oxygen in a plurality of aeration tanks and actual mean values of opening degrees of a plurality of inlet gas regulating valves;
setting a set dissolved oxygen mean value and a set opening mean value of a plurality of aeration tanks;
and controlling the operation of the plurality of blowers according to a first difference value between the set dissolved oxygen mean value and the actual dissolved oxygen mean value and a second difference value between the set opening degree mean value and the actual opening degree mean value.
7. The blower control method for a sewage treatment system according to claim 6, further comprising:
acquiring the air inlet flow of a plurality of aeration tanks as the actual aeration quantity of the plurality of aeration tanks;
calculating the required aeration amount of a plurality of aeration tanks according to the actual dissolved oxygen values in the aeration tanks;
and controlling the opening degrees of the air inlet regulating valves of the aeration tanks according to the actual aeration quantity and the required aeration quantity.
8. The sewage treatment system blower control method of claim 6, wherein the controlling operation of the plurality of blowers based on a first difference between the set mean dissolved oxygen value and the actual mean dissolved oxygen value and a second difference between the set mean opening value and the actual mean opening value comprises:
setting a first threshold value and a second threshold value;
comparing the first difference and the second difference with the first threshold and the second threshold, respectively, and controlling the output pressures of the plurality of blowers to increase when the first difference is greater than the upper limit value of the first threshold and the second difference is less than the lower limit value of the second threshold; and controlling the output pressures of the plurality of blowers to decrease when the first difference is smaller than a lower limit value of the first threshold and the second difference is larger than an upper limit value of the second threshold.
9. The sewage treatment system blower control method of claim 7, wherein the controlling the opening of the intake air regulating valve of the plurality of aeration tanks according to the actual aeration amount and the required aeration amounts of the plurality of aeration tanks comprises:
setting a third threshold value;
calculating a third difference between the required aeration amount and the actual aeration amount;
and comparing the third difference value with the third threshold value, and adjusting the opening degrees of the plurality of air inlet adjusting valves to enable the third difference value to be within the third threshold value range.
10. The blower control method for a sewage treatment system according to claim 6, further comprising setting an interval period, and controlling the operation of the plurality of blowers according to a first difference between the set mean dissolved oxygen value and the actual mean dissolved oxygen value and a second difference between the set mean opening value and the actual mean opening value after each lapse of the set period.
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