DCS control system (DIstributed Control System, distributed control system) is a comprehensive control system that has emerged with the continuous rise of modern large-scale industrial production automation and the increasingly complex process control requirements. The DCS control system basically includes an analog quantity control system (MCS), a sequential control system (SCS), a turbine DEH system, an electrical ECS system, and a bypass control system BCS system.
DCS control system composition
The analog quantity control system (MCS) is a system that controls the boilers and turbines of the turbo-generator unit as a whole. The furnace side MCS refers to the boiler main control system, boiler fuel quantity control system, air supply control system, and air induction control. System, start separator water tank water level control system and steam temperature control system; machine side MCS refers to deaerator pressure, water level adjustment system, condenser water level adjustment system; closed tank water level adjustment system; high and low water level adjustment system And auxiliary steam pressure regulation system, etc. MCS is responsible for the closed-loop automatic adjustment of the main process variables of the water, steam, coal, oil, wind, and smoke systems in the production process and the load control tasks of the entire unit turbine generator set.
The sequential control system SCS divides part of the operation of the unit into several local control systems according to the thermal system or auxiliary mechanical equipment, and operates in the order specified in advance to achieve the purpose of sequential control. The range of furnace side sequential control includes: blower, induced draft fan, primary fan, air preheater, furnace soot blowing system, etc. The scope of the machine-side sequence control system includes: steam engine lubricating oil system, condensate pump, high pressure, deaerator, progressive addition, vacuum pump, shaft seal system, circulating water system, closed water system, steam pump, electric pump, internal cooling water System, sealing oil system, rubber ball cleaning system, etc.
Boiler furnace safety monitoring FSSS can continuously and closely monitor a large number of parameters and status of the combustion system under various operating modes such as normal operation and start-stop of the boiler, continuously perform logical judgment and calculation, and issue action commands when necessary, through various sequences Control and interlocking devices, so that the relevant equipment in the combustion system (such as coal mill, coal feeder, oil gun, fire detection cooling fan, etc.) strictly follow a certain logical sequence to operate or deal with attempted accidents to ensure the safety of the boiler. At the same time, the furnace safety monitoring system also has a combustion management function. It can switch on and off the various layers of the burner of the boiler to meet the needs of the unit to start and stop and increase or decrease the load. It continuously monitors the operating parameters and status of the boiler and automatically completes it. Various operations and protective actions, such as emergency cut off of fuel supply and emergency shutdown of the furnace, to prevent accidents from expanding.
Turbine DEH system, whose main function is to adjust the speed of the steam turbine, can complete the following functions: closing the brake; automatically judging the thermal state; selecting the starting method; speed-up; 3000rpm fixed speed; generator synchronous test; grid-connected load; load ; Valve switching; single valve / sequence valve switching; adjustment stage pressure feedback; load feedback; primary frequency modulation; CCS control; ATR thermal stress control; high load limit; low load limit; valve position limit; main steam pressure limit; quick unload ; Overspeed limit OPC; Unbalance compliance; Overspeed protection OSP; Fuel injection test; Overspeed test; Valve activity test; Valve online setting; Solenoid valve test; Control mode switching.
The electrical ECS system, whose main functions are the start and stop control and logic of the generator; the control and logic of the switches of the factory electrical system; the monitoring of the parameters and equipment status of the electrical system; the relay protection action status, fault alarm and time Sequential recording.
The main function of the steam pump unit MEH system is to adjust the speed of the steam pump unit, and it can complete the following functions: closing brake, speed increase, fixed speed, CCS control, overspeed protection and other functions.
Bypass control system BCS system. The bypass system is an independent system. The bypass control can complete the exact requirements of the bypass operation, and can complete the safety function or the quick open / close function. Its basic components are divided into high side control The controller and low side controller mainly realize the pressure control and temperature control of the high and low side.
The main technical overview of the system
The system mainly consists of on-site control station (I / O station), data communication system, human-machine interface unit (operator station OPS, engineer station ENS), cabinet, power supply, etc. The system has an open architecture and can provide multiple layers of open data interfaces.
The hardware system has high reliability, convenient maintenance and advanced technology in the harsh industrial site. The bottom-level Chinese software platform has powerful processing functions, and provides the ability to easily configure complex control systems and the user's ability to independently develop special advanced control algorithms; easy to configure and easy to use. Support multiple fieldbus standards to meet future expansion needs.
The design of the system adopts appropriate redundancy configuration and self-diagnosis function from diagnosis to module level, and has high reliability. Failure of any component in the system will not affect the work of the entire system.
The parameters, alarms, self-diagnosis and other management functions of the system are highly concentrated on CRT display and printing on the printer, and the control system is truly decentralized in function and physics.
The availability of the entire system is at least 99.9%; the average trouble-free time of the system is 100,000 hours, which achieves complete monitoring in many fields such as nuclear power, thermal power, thermal power, petrochemical, chemical, metallurgy, and building materials.
The concept of "domain". The large-scale control system is divided into a number of relatively independent subsystems with a high-speed real-time redundant network. A subsystem constitutes a domain, and each domain shares management and operation data, and each domain is a fully functional DCS system for better Satisfy the user's use.
Network structure reliability, openness and advancedness. At the system operation layer, redundant 100Mbps Ethernet is used; at the control layer, redundant 100Mbps industrial Ethernet is used to ensure the reliability of the system; at the field signal processing layer, the 12Mbps PROFIBUS bus connects the central control unit and each field signal Processing module.
Standard Client / Server structure. The operation layer of MACS system adopts Client / Server structure.
Open and reliable operating system. The operating layer of the system adopts WINDOWS NT operating system; the control station adopts the mature embedded real-time multi-task operating system QNS to ensure the real-time, safety and reliability of the control system.
Standard control configuration software. Can achieve any monitoring and control requirements.
Scalability and scalability. Ensure economy.
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