CN106249767B - Multi-point flow distribution integrated equipment and control method thereof - Google Patents
Multi-point flow distribution integrated equipment and control method thereof Download PDFInfo
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Abstract
The invention provides a multi-point flow distribution integrated device and a control method thereof, and a packetThe device comprises a PLC controller and a water tank, at least one pumping pipeline connected with the water tank through a water inlet pipe main valve, and a plurality of water outlet pipelines communicated with the pumping pipeline, wherein an online COD analyzer and an online ammonia nitrogen analyzer are arranged between the pumping pipeline and the pipeline of the water tank; the water outlet pipeline is provided with a distributing pipe electric butterfly valve; the online COD analyzer, the online ammonia nitrogen analyzer and the distribution pipe electric valve are all connected with the PLC controller through signal lines; the PLC controller is used for controlling the COD value and the COD/NH of the water stored in the water tank according to the detection of the online COD analyzer and the online ammonia nitrogen analyzer 3 The ratio controls the opening degree of the distributing pipe electric valve. The water quality of raw water is detected and analyzed on line, and the flow distribution of each water consumption point is automatically controlled and regulated according to specific water quality by combining the cooperation of the PLC controller and the distribution pipe electric regulating butterfly valve.
Description
Technical Field
The invention relates to the field of sewage treatment and industrial water supply treatment, in particular to a multi-point flow distribution integrated device and a control method thereof.
Background
The Chinese patent with the publication number of CN102001791B provides a method for strengthening treatment of urban sewage in cold areas based on multi-point water inflow regulation, so as to solve the problems of synchronous and efficient denitrification and dephosphorization, poor treatment effect, high operation cost and inapplicability to treatment of urban sewage in cold areas. According to the invention, the sewage is distributed to the anaerobic tank and the anoxic tank in a certain proportion, so that the residence time of the sewage in the anaerobic tank and the anoxic tank is increased, and if the residence time is designed according to the conventional process, the volumes of the anaerobic tank and the anoxic tank can be reduced, and the construction cost is saved; the contradiction of carbon sources in the conventional process is effectively solved, so that the carbon sources are sufficient in the anaerobic section phosphorus release process and the anoxic section denitrification process, and the denitrification and dephosphorization effects are improved; the sludge reflowing to the anaerobic tank adopts a lower reflow ratio of 5-30%, so that the purpose of dephosphorization can be achieved; the sludge reflux to the head end of the aerobic tank is 30-50%, and the nitrifying liquid reflux is 100-300%, so that a good denitrification effect can be achieved; effectively solves the contradiction of sludge age in the conventional process, and improves the denitrification and dephosphorization effects by controlling different sludge ages suitable for denitrification and dephosphorization through the proportion of water distribution.
However, at present, a plurality of sectional water inflow or point water inflow sewage biological denitrification and dephosphorization treatment processes are applied at home and abroad, and on the adjustment of multi-point flow distribution, different water inflow distribution ratios are generally set according to the water quality of the earlier stage water inflow, and are completed by manually adjusting a manual valve or a gate. Such execution can present two problems: firstly, the water inflow flow of multiple points cannot be reasonably distributed at any time according to the change of the water inflow quality, so that the waste of water inflow carbon sources and the reduction of nitrogen and phosphorus removal rate are caused; secondly, because the water quality changes at any time, the manual valve adjustment is frequent, and the manual workload is large. In addition, in the field of industrial water supply treatment, the same process can be designed into a plurality of groups of structures or a plurality of sets of equipment, such as a V-shaped filter, a multi-medium filter, an activated carbon filter and the like, when the opening degree of a manual water inlet valve is originally set to change the total water inflow, the water inlet of each group of equipment or structure is inevitably uneven due to factors such as non-full pipe flow, along-path head loss and the like, and more manpower is required if the water inlet is regulated by a manual method.
Disclosure of Invention
In order to solve the technical problems and the problem of large workload caused by manual flow adjustment of the existing sectional water inflow or the split water inflow, the invention provides a multi-point flow distribution integrated device and a control method thereof, wherein water source water inflow is distributed into multi-point water inflow according to a set proportion through an integrated intelligent complete device, a large amount of manual calculation and manual operation are omitted, the problem caused by low accuracy of manual flow adjustment is avoided, and meanwhile, the operation treatment effect under different conditions can be analyzed and optimized.
The present invention achieves the above technical object by the following means.
The control method of the multi-point flow distribution integrated equipment is characterized in that the multi-point flow distribution integrated equipment comprises a PLC (programmable logic controller) and a water tank, at least one pumping pipeline connected with the water tank through a water inlet pipe main valve, a plurality of water outlet pipelines communicated with the pumping pipeline, a manual butterfly valve before a pump, a centrifugal pump, a check valve and a manual butterfly valve after the pump are arranged on the pumping pipeline, an online COD (chemical oxygen demand) analyzer and an online ammonia nitrogen analyzer are arranged on the pipelines of the water inlet pipe main valve and the water tank, and the online COD analyzer and the online ammonia nitrogen analyzer detect the COD value and COD/NH of raw water in real time 3 Ratio of; the water outlet pipeline is sequentially provided with a manual butterfly valve, a distributing pipe electric butterfly valve, a distributing pipe flowmeter and a manual butterfly valve; a liquid level switch is arranged in the water tank and is connected with the centrifugal pump; the online COD analyzer, the online ammonia nitrogen analyzer and the distribution pipe electric valve are all connected with the PLC controller through signal lines; the PLC controller is used for controlling the COD value and the COD/NH of the water stored in the water tank according to the detection of the online COD analyzer and the online ammonia nitrogen analyzer 3 The ratio controls the opening degree of the distributing pipe electric valve;
the three water outlet pipelines of the multi-point flow distribution integrated equipment are provided, and the control strategies are as follows:
when COD/NH 3 When the flow distribution ratio of three points of the three water outlet pipelines is less than or equal to 3, the flow distribution ratio of the three points of the three water outlet pipelines is 55 percent: 35%:10%;
when 3 is<COD/NH 3 When the flow distribution ratio of three points of the three water outlet pipelines is less than or equal to 5, the flow distribution ratio of the three points of the three water outlet pipelines is 40 percent: 40%:20% of a base;
when 5<COD/NH 3 When the three-point flow distribution ratio of the three water outlet pipelines is 40 percent: 30%:30%;
the method comprises the following steps:
(1) On-line COD analyzer and on-line ammonia nitrogen analyzer real-time detection water tankCOD value and COD/NH of water source of (2) 3 The ratio value and the detected data are transmitted to the PLC in real time;
(2) The PLC controller is used for controlling the COD value and the COD/NH of the water stored in the water tank according to the detection of the online COD analyzer and the online ammonia nitrogen analyzer 3 The ratio and a control strategy built in a PLC controller are used for controlling the opening degree of the distribution pipe electric valve; the control strategy is as follows:
when COD/NH 3 When the flow distribution ratio of three points of the three water outlet pipelines is less than or equal to 3, the flow distribution ratio of the three points of the three water outlet pipelines is 55 percent: 35%:10%;
when 3 is<COD/NH 3 When the flow distribution ratio of three points of the three water outlet pipelines is less than or equal to 5, the flow distribution ratio of the three points of the three water outlet pipelines is 40 percent: 40%:20% of a base;
when 5<COD/NH 3 When the three-point flow distribution ratio of the three water outlet pipelines is 40 percent: 30%:30%;
(3) The distribution pipe flowmeter on the water outlet pipeline detects the water flow in the water outlet pipeline in real time, and feeds the detected flow data back to the PLC, and the PLC confirms and checks whether the opening degree of the distribution pipe electric regulating butterfly valve meets the flow distribution proportion set in the step (2) according to the flow information, fine-adjusts or finely adjusts the opening degree of the valve plate of the electric regulating butterfly valve, and finally achieves that the flow distribution ratio of the water outlet pipe accords with the flow distribution ratio output by the PLC.
Further, still be provided with the distribution pipe flowmeter on the outlet pipe way, the distribution pipe flowmeter pass through the signal line with the PLC controller hookup, the distribution pipe flowmeter detects in real time the discharge flow in the outlet pipe way, and feed back the flow data that detects to the PLC controller, the PLC controller is according to flow information confirms and checks whether the opening degree size of distribution pipe electric control butterfly valve satisfies the flow distribution proportion of settlement to carry out fine adjustment or fine setting to the valve plate opening degree of electric control butterfly valve, finally realize that outlet pipe flow distribution ratio accords with the flow distribution ratio of PLC output.
Further, the water inlet of the centrifugal pump is connected with the pipeline by adopting a rubber hose.
Further, the centrifugal pump is a horizontal centrifugal pump.
The invention relates to a multi-point flow distribution integrated device which is used for designing a same process into a plurality of groups of parallel structures or devices in industrial water supply treatment, directly and evenly distributing raw water according to the number of water consumption points, and simultaneously conveying the raw water in a water tank to different water consumption points according to proportion by a horizontal centrifugal pump; the water quality of raw water is detected and analyzed in real time through the online COD analyzer and the online ammonia nitrogen analyzer, and the flow distribution of each water consumption point is automatically controlled and regulated according to specific water quality and equipment by combining the synergistic effect of the PLC controller and the distribution pipe electric regulating butterfly valve.
The device can be used for municipal sewage denitrification and dephosphorization treatment systems, and raw water is generally distributed into three-point water inflow in order to improve the utilization rate of water inflow carbon sources and the denitrification and dephosphorization effects. The flow distribution ratio parameters provided by the invention are obtained based on the earlier stage segmented water inlet process performance study, firstly, the optimal water inlet flow distribution ratio experiment of the segmented water inlet process under the condition of treating different water qualities in the south and the north of China is obtained, and secondly, the invention is obtained by the practice of multiple sets of multi-medium filters, activated carbon filters, reverse osmosis systems and mixed bed average water supply applied in practical engineering.
In summary, according to the water quality of the water source and the water consumption point requirements, the feed-forward, model and feedback control mode is adopted, the water source inflow is distributed into multi-point inflow through the integrated intelligent complete equipment according to the set proportion, a large amount of manual calculation and manual operation are omitted, and the problem caused by manual control is avoided; meanwhile, the operation treatment effect under different conditions can be analyzed and optimized.
The device can design and customize the size of a water pump, a pipeline pipe fitting, a manual valve, an electric regulating butterfly valve and the size of a whole device base and a box body according to the size of the water delivery quantity. Is generally suitable for delivering 100-20000m water 3 And/d, the middle and small town or rural sewage treatment and industrial water supply treatment industries.
Drawings
Fig. 1 is a flow chart of a multi-point flow distribution integrated equipment device according to the invention.
In the figure: 1-a water tank; 2-an online COD analyzer; 3-an online ammonia nitrogen analyzer; 4, a water inlet pipe main valve; 5-a manual butterfly valve in front of the pump; 6-a rubber soft joint before the pump; 7-a horizontal centrifugal pump; 8-a post-pump check valve; 9-manual butterfly valve after pump; 10-manual butterfly valve in front of dispensing tube; 11-distributing pipe electric regulating butterfly valve; 12-a dispensing tube flow meter; 13-a manual butterfly valve after dispensing the tube; 14-water point output line; 15-an intelligent electric control cabinet; 16-a base and a box housing.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
As shown in fig. 1, the multi-point flow distribution integrated equipment comprises a PLC controller and a water tank, at least one pumping pipeline connected with the water tank through a water inlet pipe main valve, and three water outlet pipelines communicated with the pumping pipeline, wherein the pumping pipeline is provided with a front manual butterfly valve, a horizontal centrifugal pump, a check valve and a rear manual butterfly valve, and a water inlet of the horizontal centrifugal pump is connected with the pipeline through a rubber hose. An online COD analyzer and an online ammonia nitrogen analyzer are arranged on the pipeline of the water inlet pipe main valve and the water tank and are used for detecting the COD value and COD/NH of raw water in real time 3 Ratio of the two. The water outlet pipeline is sequentially provided with a manual butterfly valve, an electric butterfly valve of the distribution pipe, a flowmeter of the distribution pipe and a manual butterfly valve. The water tank is internally provided with a liquid level switch, and the liquid level switch is connected with the horizontal centrifugal pump and is used for controlling the opening and closing of the horizontal centrifugal pump. And the online COD analyzer, the online ammonia nitrogen analyzer and the distribution pipe electric valve are all connected with the PLC through signal lines. The on-line COD analyzer and the on-line ammonia nitrogen analyzer are used for detecting the COD value and the COD/NH of raw water 3 The ratio is sent to a PLC controller, and the PLC controller is used for controlling the COD value and the COD/NH of the water stored in the water tank according to the detection of the online COD analyzer and the online ammonia nitrogen analyzer 3 The ratio controls the opening degree of the distributing pipe electric valve.
In this embodiment, still be provided with the distribution pipe flowmeter on the outlet pipe way, the distribution pipe flowmeter pass through the signal line with the PLC controller hookup, the distribution pipe flowmeter detects in real time the discharge flow in the outlet pipe way to feed back the flow data that detects to the PLC controller, the PLC controller is according to flow information confirms and checks whether the opening degree size of distribution pipe electric control butterfly valve satisfies the flow distribution proportion of settlement, and carries out fine adjustment or fine setting to distribution pipe electric valve opening degree, finally realizes that outlet pipe flow distribution ratio accords with the flow distribution ratio of PLC output.
Raw water in the water tank 1 passes through a horizontal centrifugal pump, and water sources are simultaneously conveyed to different water consumption points according to a proportion; the delivery proportion of each water point is to adjust the opening degree of the valve plate of the electric adjusting butterfly valve 11 on the water outlet pipeline through an on-line monitoring instrument and a PLC controller according to the water quality of raw water, so as to obtain the water quantity of each water point.
The control method of the multipoint flow distribution integrated equipment provided by the invention comprises the following steps: on-line COD analyzer and on-line ammonia nitrogen analyzer for detecting COD value and COD/NH of water source in water tank in real time 3 The ratio value and the detected data are transmitted to the PLC in real time; the PLC controller is used for controlling the COD value and the COD/NH of the water stored in the water tank according to the detection of the online COD analyzer and the online ammonia nitrogen analyzer 3 The ratio and a control strategy built in a PLC controller are used for controlling the opening degree of the distribution pipe electric valve; the distribution pipe flowmeter on the water outlet pipeline detects the water flow in the water outlet pipeline in real time, and the detected flow data is retransmitted to the PLC controller in the form of 4-20mA data, the PLC controller confirms and checks whether the opening degree of the distribution pipe electric regulating butterfly valve meets the set flow distribution proportion according to the flow information, and fine-adjusts or finely-adjusts the opening degree of the valve plate of the distribution pipe electric valve, so that the reciprocating circulation is realized, and finally, the flow distribution ratio of the water outlet pipe is consistent with the flow distribution ratio output by the PLC.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (4)
1. The control method of the multi-point flow distribution integrated equipment is characterized in that the multi-point flow distribution integrated equipment comprises a PLC (programmable logic controller) and a water tank, at least one pumping pipeline connected with the water tank through a water inlet pipe main valve, a plurality of water outlet pipelines communicated with the pumping pipeline, a manual butterfly valve before a pump, a centrifugal pump, a check valve and a manual butterfly valve after the pump are arranged on the pumping pipeline, an online COD (chemical oxygen demand) analyzer and an online ammonia nitrogen analyzer are arranged on the pipelines of the water inlet pipe main valve and the water tank, and the online COD analyzer and the online ammonia nitrogen analyzer detect the COD value and COD/NH of raw water in real time 3 Ratio of; the water outlet pipeline is sequentially provided with a manual butterfly valve, a distributing pipe electric butterfly valve, a distributing pipe flowmeter and a manual butterfly valve; a liquid level switch is arranged in the water tank and is connected with the centrifugal pump; the online COD analyzer, the online ammonia nitrogen analyzer and the distribution pipe electric valve are all connected with the PLC controller through signal lines; the PLC controller is used for controlling the COD value and the COD/NH of the water stored in the water tank according to the detection of the online COD analyzer and the online ammonia nitrogen analyzer 3 The ratio controls the opening degree of the distributing pipe electric valve;
three water outlet pipelines of the multi-point flow distribution integrated equipment are provided;
the method comprises the following steps:
(1) On-line COD analyzer and on-line ammonia nitrogen analyzer for detecting COD value and COD/NH of water source in water tank in real time 3 The ratio value and the detected data are transmitted to the PLC in real time;
(2) The PLC controller is used for controlling the COD value and the COD/NH of the water stored in the water tank according to the detection of the online COD analyzer and the online ammonia nitrogen analyzer 3 The ratio and a control strategy built in a PLC controller are used for controlling the opening degree of the distribution pipe electric valve; the control strategy is as follows:
when COD/NH 3 When the flow distribution ratio of three points of the three water outlet pipelines is less than or equal to 3, the flow distribution ratio of the three points of the three water outlet pipelines is 55 percent: 35%:10%;
when 3 is<COD/NH 3 When the temperature is less than or equal to 5, three points of three water outlet pipelinesThe flow distribution ratio is 40%:40%:20% of a base;
when 5<COD/NH 3 When the three-point flow distribution ratio of the three water outlet pipelines is 40 percent: 30%:30%;
(3) The distribution pipe flowmeter on the water outlet pipeline detects the water flow in the water outlet pipeline in real time, and feeds the detected flow data back to the PLC, and the PLC confirms and checks whether the opening degree of the distribution pipe electric regulating butterfly valve meets the flow distribution proportion set in the step (2) according to the flow data, and fine-adjusts or finely adjusts the valve plate opening degree of the distribution pipe electric valve, so that the water outlet pipe flow distribution ratio is in accordance with the flow distribution ratio output by the PLC.
2. The control method of the multipoint flow distribution integrated equipment according to claim 1, wherein a distribution pipe flowmeter is further arranged on the water outlet pipeline and is connected with the PLC through a signal line, the distribution pipe flowmeter detects water flow in the water outlet pipeline in real time and feeds back detected flow data to the PLC, the PLC confirms and checks whether the opening degree of the distribution pipe electric regulating butterfly valve meets a set flow distribution proportion according to the flow information, fine adjustment or fine adjustment is carried out on the opening degree of the distribution pipe electric valve, and finally the water outlet pipe flow distribution ratio is matched with the flow distribution ratio output by the PLC.
3. The control method of the integrated multi-point flow distribution equipment according to claim 1, wherein the water inlet of the centrifugal pump is connected with the pipeline by adopting a rubber hose.
4. The control method of the multipoint flow distribution integrated apparatus according to claim 1, wherein the centrifugal pump is a horizontal centrifugal pump.
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| US4872763A (en) * | 1987-05-01 | 1989-10-10 | Fuji Photo Film Co., Ltd. | Method of and apparatus for measuring liquid |
| CN101143750A (en) * | 2007-06-28 | 2008-03-19 | 北京工业大学 | Control device and method for four-section water-feeding A/O technique water-feeding flow rate distribution process |
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