Integrated experimental device for thermal instrumentation and environmental process control

Integrated experimental device for thermal instrumentation and environmental process controlAdopting a modular structure, it consists of four parts: object system (waterway and tank), detection system (sensors), control system (PLC and frequency converter), and monitoring software.

1. Object system (industrial grade material)

•Water storage tank and buffer pool:100LStainless steel（304）Water storage tank with low liquid level alarm switch;20LTransparent organic glass reaction tank (simulated aeration tank)/Neutralization pool is convenient for observing the fluid state.

•Power pump unit:* Main circulating pump: DC water pump or AC variable frequency pump（0.37kW）, traffic0 \\sim 3 m^3/hHead lift10m.

•Dosing pump: precision stepper metering pump, flow rate0 \\sim 500mL/min, support4 \\sim 20mASignal ratio control.

•Pipeline system: Industrial gradeUPVCOr stainless steel pipelines, equipped with manual ball valves, check valves, and transparent sight glasses.

2. Detection and execution instruments

•Flow meter: Industrial grade electromagnetic flow meter, precision\\pm 0.5\\% FSSignal output4 \\sim 20mA.

•Level gauge: Input type static pressure level transmitter, range0 \\sim 1m, accuracy0.2Grade.

•Water quality monitoring module:

•onlinepHMeter: Range0 \\sim 14 pHEquipped with temperature compensation function and response time< 30s.

•Dissolved oxygen（DO）Instrument: Fluorescence method (no need to replace the membrane), measuring range0 \\sim 20mg/L.

•Turbidity meter (optional): diffuse online turbidity meter, range0 \\sim 400 NTU.

•Regulating valve: an electronic electric regulating valve with equal percentage characteristics, used for precise control of inlet or dosing flow.

3. Core of Electronic Control and Automation

•Controller: SiemensS7-1200\\ CPU\\ 1214C\\ DC/DC/DCIntegrate Ethernet port and expand8 Road analog input and4 Road analog output module.

•Inverter: High performance universal inverter (such as Siemens)V20Or Schneider series), supportingRS485/Modbuscommunication

•Human computer interface（HMI）：10 Inch high color deep industrial touch screen, pre installed configuration screen.

II Experiment Program(Experimental Syllabus)

The outline is divided into four stages, covering core skills in environmental engineering from basic understanding to comprehensive process control.

Module 1: Basic Instruments and Characteristic Testing Experiment (Cognitive Chapter)

1. Sensor verification experiment: learning liquid level, pressure, flow ratepHZero point migration and full-scale calibration of instruments.

2. Object characteristic determination experiment: Using the step response curve method, measure the pure lag time and time constant of the water tank level and reaction tank temperature.

3. Variable frequency drive speed regulation and pump characteristic experiment: exploring frequencyfRegarding trafficQHead liftHThe law of proportion.

Module 2: Basic Process Control Experiment (Automation Section)

1. liquid level/Flow single loopPIDControl: LearningPTheITheDThe impact of parameters on system stability.

2. Cascade Control System Experiment: Implementation“liquid level-traffic”Cascade control, experience how the secondary circuit quickly suppresses disturbances.

3. Flow ratio control experiment: Simulate real-time ratio control of raw water and dosage in a water treatment plant.

Module 3: Environmental Engineering Special Process Control Experiment (Process Section)

1. Automatic control of acid-base neutralization（pHControl: Simulate acidic wastewater treatment throughPIDAlgorithmic control of dosing pump to produce effluentpHstabilize at7.0 \\pm 0.5.

2. Dissolved oxygen in aeration tank（DO）Constant control: Simulate activated sludge process, according toDOSensor feedback automatically adjusts the frequency conversion of the fan.

3. Turbidity linkage dosing control (flocculation experiment): Based on changes in influent turbidity, automatically calculate and add coagulants (simulating coagulation and sedimentation process automation).

Module 4: Intelligent Monitoring and Comprehensive Training (Advanced Edition)

1. PLCProgramming Logic Design: Students Hands on Writing Sequential Control for Sludge Discharge and Backwash Processes in Water Plants（SFC）Program.

2. Development of upper computer configuration system: Design an industrial real-time monitoring interface to achieve alarm recording, historical data query, and report generation.

3. Remote operation and maintenance experiment: Learn to monitor mobile data through industrial IoT gateway.

III Design Highlights Copywriting

• “What You See Is What You Get”Practical training experience: All components adopt industrial grade standards, and the control logic completed in the laboratory can be directly transferred to real sewage treatment engineering sites.

•Compact Layout: Insufficient Floor Area1.5 m^2Not only does it save laboratory space, but it is also highly integrated, making it convenient for teachers to conduct collective demonstration teaching.

•Safety protection design: equipped with strong and weak current separation, emergency stop locking, leakage protection, and idle anti burn protection to ensure the safety of student operations.