Keywords: AIFCS fieldbus type control system Abstract: Combined with the practical application of AIFCS fieldbus technology in sewage treatment engineering, real-time monitoring, convenient construction, saving time and effort, saving investment.
I. Overview The Yixing Synergic Citric Acid Wastewater Treatment Plant uses an anaerobic and aerobic treatment process, in which the aerobic part is treated by the SBR process. SBR is one of the ideal ways to treat high concentration organic wastewater. The first phase of the design process is 100 cubic meters per hour, and there are 2 treatment tanks, including 2 anaerobic towers, oxidation ditch and organic adjustment tank. The control equipment is distributed and distributed, and it is required to implement bus type remote detection control.
| System overall process composition |
Second, the use of data bus
Monitoring data 35 Click on the original design cable number up to 148 cables, using the bus method, that is, 1
Power cable, 1 data cable bus, the cable trench section of the relevant plant area is greatly reduced or even eliminated, which reduces the difficulty of integrated wiring of the pipeline in the plant area, convenient construction, saving time and effort, and saving investment.
Third, the system structure is divided to achieve automatic control of the entire system, we can know that the following parameters need to be automatically monitored: PH, oxygen, temperature, flow, real-time measurement, adjustment pool high / low liquid level, CASS pool high / low, thick / Fine grid machine, blower, inlet pump, explosion machine start/stop. In addition to completing the measurement and control tasks, the system also has a good human-machine interface.
Fourth, the layout and selection of measurement and control communication modules
Set on-site instrument box, install analytical instrument, and install AI series rail-mounted intelligent module shape code E5 (including single/dual temperature transmitter, multi-channel switch and analog input/output module, single channel) / Dual/Quad PID Temperature Control Module, AI Artificial Intelligence MPT/PID Regulator Module and Flow Totalizer Module, etc.)
1. Water level control of collecting wells:
It is used for automatic control of start and stop motors at high and low water levels. E5 external rail mounting method;
AI-704ME5J5L2S 4-channel display alarm device. Module description J5 water level transmitter input; L2 relay output.
2. The motor automatically starts and stops:
The electrical MCC disk motor control center is placed in the center of the sewage field. The remote switch is arranged in the MCC disk and connected to the computer by a communication line, saving 72 control cables.
The time of the oxidation ditch stirring motor is intermittently started and stopped, and the parameters are set by the computer and the relay is cycled.
Select AI-301MPE5L2S module: L2 relay; S communication
3. Remote manual control motor:
The blower and the water regulating tank motor start and stop,
Select AI-301ME5L5L5L5L5L5L5S relay switch output,
Manually control the motor on the computer.
4. Motor running feedback signal select AI-301ME5I5I5I5I5I5S
Used for man-machine interface animation to display motor running status.
The switching signal reflecting the process equipment is mainly divided into the following three categories: the first type is the running signal, which is determined by the division and closing state of the contactor in the main circuit, and is given by the normally open contact of the corresponding intermediate relay; The class is an automatic/manual status signal, which is determined by the manual/automatic transfer switch and is given by the normally open contact of the corresponding intermediate relay; the third type is the normal/fault signal, which is the integrated fault signal, including overload, overcurrent, super Limit the pump to over temperature. For the electric valve and the decanter, the opening (rising) is added to the position, the closing (falling) is in place, and a stepping drainage signal is added to the decanter. These signals are connected in series by the fault contact of the device and then by an intermediate relay. The closed contact is given so that the operator of the central control room can see the operation of the field device at a glance.
5. Online dissolved oxygen, PH measurement:
Configure METTLER TOLEDO dissolved oxygen, PH instrument output 4 ~ 20mA for signal acquisition module AI-706ME5J4J4J4S type 6-channel measurement. The module description selects J4 current input; S communication module.
6. Flow measurement:
The meter is mainly used for system monitoring. Flow meter is set in the important process section of the SBR aerobic section.
AI-708HE5I4L2L2S flow totalizer, transmitter passive signal 4 ~ 20mA Select I4 module 4 ~ 20mA input contains 24V power supply.
V. Monitoring and management system
It is located in the central control room and is responsible for monitoring the sewage treatment process and equipment operation conditions inside and outside the plant. The industrial control software monitors the process parameters of the whole plant, equipment operation, fault occurrence, etc. in real time, and performs various modes of operation, and is responsible for daily report printing, accident printing and data recording.
There are various screens in the computer display of the operation station, including: total process flow picture, process flow sub-picture such as mud and water gas, process equipment picture of each structure, various process parameter pictures, process parameter change trend picture, fault picture, equipment operation data. Picture, etc. Through these pictures, the staff can fully understand the various parts of the process, reflect the data and pictures of all aspects of the process in a comprehensive and detailed and real-time manner, and timely grasp the various situations that occur in each link. At the same time, it has voice prompts, alarms and online help functions. The printer can print all kinds of materials at any time, and can print daily, weekly, monthly reports, etc. at regular intervals.
Considering that information technology has been widely used, computer network interconnection equipment is set up in the central control room, and an interface for accessing the local area network and the Internet is established, which enables transparent remote management. The central control room and the sub-control station equipment can be realized by webpage and email. Log in to browse or send an alarm message.
in conclusion
The sewage treatment engineering automatic control system has completed all the work from design to construction, installation, commissioning and finally to the official operation. The system not only achieves the purpose of automatic control according to the requirements of the sewage treatment process, but also ensures that the sewage reaches the standard discharge. To sum up, it has the following characteristics:
1. The system design is reasonable. The selection of the upper computer, electrical cabinet and instrument should be based on the advanced nature, stability and reliability, and at the same time take into account the economy, so that the whole control system can achieve the lowest price on the basis of ensuring long-term safe operation.
2. The monitoring management computer monitors the whole system in real time, and the process flow chart is vivid. The operator can understand the operation status of the on-site process and electrical equipment at a glance, and modify the parameters online at any time according to the process conditions.
3. The system has strong anti-interference ability, no matter from the computer power system or hardware selection to the cable laying ground, etc., this problem is fully considered, so the stability is good, the reliability is high, and the labor intensity of the workers is greatly reduced. The number of classes was reduced from 5 to 2 people.
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