I. Project Overview
China’s energy conservation and environmental protection industry ranks first among strategic emerging industries, and its policy supports it strongly. Investment in environmental protection industry will reach 3.1 trillion. Major environmental protection investment projects involve solid waste treatment, desulfurization and denitrification, municipal sewage, sludge, and industrial wastewater. aspect.
Solid waste treatment usually refers to physical, chemical, biological, physical, and biochemical methods that convert solid waste into a process suitable for transport, storage, use, or disposal. The goal of solid waste disposal is harmless, reduced, and resourced. .
This case is mainly applied to the sludge treatment system of Jinnan Sludge Treatment Plant. This system adopts the international advanced anaerobic ammonia oxidation technology and effectively eliminates all sludge, such as water, heavy metals, and organic pollutants. Harmful treatment. The treated sludge is used as a greening soil, land improvement soil, etc. to maximize its effective use. The entire process embodies the features of low-carbon environmental protection, energy conservation and emission reduction, and recycling of resources and energy, and it has a strong demonstration of circular economy in China.
Second, the system architecture
The system uses force-controlled ForceCon platform to build a sludge plant monitoring system. The system architecture design uses ring network communication. The upper system uses two real-time history databases pSpace real-time communication site PLC, two eForceCon clients to display the process flow and monitoring parameters, one The engineer station does engineering revision management. Two printers are used to print alarm event information. Operators can monitor various dynamic screens, parameter trend graphs, historical trend graphs, and alarm screens through the operator station. They can also perform monitoring screens as needed. Modify and add. According to the operating conditions, the operating personnel perform various control operations through the operator interface and perform control operation records according to the authority.
System Architecture and Network Design:
Third, system function
The sludge treatment process mainly includes three parts: sludge purification treatment, sewage treatment, and biogas recovery. The sludge purification process mainly completes the processes of sludge receiving and distribution, digestion, dehydration, and drying; the sewage treatment is the process of removing phosphorus from and removing nitrogen from the wastewater, and the biogas recovery is mainly the recovery and utilization of biogas such as biogas torch, biogas boiler, etc. process.
The monitoring system can intuitively monitor the processes of concentration, conditioning, dewatering, stabilization, drying, or incineration, such as reduction, stabilization, and detoxification, of each sludge process, and dynamically display production data in real time to fully grasp production trends. .
Receiving and provisioning:
The system realizes the automatic control of sludge unloading guidance and sludge deployment (concentration), including the control of rolling blinds, concentration adjustment and sludge agitation, to prevent the impact of sludge release on the environment. The system displays real-time status of the coarse pool “empty pondâ€, “work in progressâ€, “finished productâ€, “failure/repair†and other conditions, and provides sludge to the digester tank quantitatively through the deployment system.
Sludge digestion
Sludge has a large amount of organic matter and pathogenic bacteria. If it is directly discharged into nature, it will be sold by micro-organisms and affect nature. This process mainly requires digestion and decomposition of sludge before the drainage system to achieve pollution-free purposes. Through the monitoring platform, the digestion process can be remotely monitored, and the agitator and feed control can be remotely controlled, and the temperature of the digester can be monitored through the trend component to aid in parameter adjustment of the digestion process.
Sludge dewatering
The system can monitor the dehydration sludge dewatering, and can dynamically check the sludge flow rate in real time, remotely control the dehydration machine's dosing and pressure control, and can measure the high and low liquid level and flow of the dilution agitating tank.
Sludge drying
The sludge drying process is mainly used to dry the sludge. The system can detect the temperature, pressure and flow rate in the dryer, and can remotely control the drying machine and the induced draft fan.
Sewage treatment
The sewage treatment system is divided into a phosphorus removal unit and a denitrification unit. The monitoring system monitors the operating status, process data, and instrument “failure†alarms of all units and accepts remote automatic control of the central control room.
Biogas system
The system can be used for biogas recovery, biogas incineration and biogas boiler real-time monitoring.
IV. Project Summary
Through the sludge treatment monitoring system, the operators can grasp the on-site process conditions of the sludge treatment and the operation status of the equipment in real time, ensure the stable operation of the sludge treatment system, and achieve the purpose of advanced sludge treatment, reliable operation, and stable production. Secondary pollution of solid waste to the natural environment.
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