(There are three protection processors inside the module. It can receive input signals from speed sensors, flame detectors and voltage transformers to complete emergency electronic overspeed protection, flame detection and synchronization functions. The output signal of the solenoid valve is to complete the hardware vote in the interrupting card associated with it. The blocking contact signals received by the blocking card come from emergency speeding, individual controls, manual blocking buttons, and other hard-wired user interruptions. Mini Lifts,Mini Lift Kit,Mini Lift Truck,Mini Lift Machine Marco Lift (Ningbo) Co., Ltd. , https://www.marcolift-asia.com
The 2x150MW gas-steam combined cycle generating unit of the Sulige heating and peaking gas plant in Inner Mongolia can provide an important peaking power supply for the grid, improving the safety and stability of the grid operation and the economics of the operation of the thermal power generating units in the grid. Sulige Heating Peaking Gas Power Plant is the first gas-steam combined cycle generating unit built in Inner Mongolia.
The gas turbine unit adopts GE Company PG9171E type.
2. Characteristics of the control system 2.1 The control level and method adopts furnace, machine, and electric centralized control methods. The two machines are combined to set up a control room. Network control is located in the unit control room. The transformer station and plant power control system are DCS. A closed-circuit television monitoring system is set up in the whole plant, and a blue-eye view of an important unattended area is performed in a centralized control room through a closed-circuit television monitoring system. The operation management of the combined cycle unit in the centralized control room is completed by a main duty operator and two auxiliary duty operators. On-duty operator can achieve remote operation through the control room's operation keyboard and dedicated control board. In the start-up, stop, normal operation of the unit and handling of abnormal conditions, a small amount of intervention by the person who needs to operate can be completed automatically.
The control system of each gas-steam combined cycle unit uses a decentralized control system (DCS), with color LCD, keyboard/mouse as the main monitoring means of the combined cycle unit. In the central control room, monitoring equipment such as conventional indicators/recording tables, thermal signal light cards, and manual/automatic operation stations are no longer set. The hard-wired emergency stop button of the combined cycle unit and the operation buttons of the important auxiliary machine are configured on the DCS console to ensure safe shutdown of the unit in an emergency.
The MARK-VI system is supplied with the main equipment. The MARK-VI provides two sets of operator stations (HMI), one of which is located in the local control room and the other is located in the centralized control room. The combustion engine control system (MARK-VI) is connected in two-way communication with the combined cycle unit DCS. The operation personnel can realize the monitoring of the gas turbine unit through the man-machine interface (HMI) of the gas turbine control system in the central control room. The gas turbine has a control room in place, and normal operation monitoring and load regulation can also be realized in the local control room.
TSI, DEH and ETS are all supplied by the turbine plant.
The chemical water treatment system is provided with a local control room. The PLC is used to add a bit-by-bit method. The operating personnel complete the monitoring and control of the entire process equipment through the LCD and keyboard equipment.
2.2 Control Room Arrangement The control room layout is based on furnace, machine, electricity and network control centralized control methods. Two combined cycle units have a centralized control room.
The centralized control room is located in the 8-meter operating floor of the BC engine room. The control room area is approximately 100m2. The control room is mainly equipped with a DCS operator station, a steam engine DEH operator station, a gas engine MARK-VI operator station, a network-controlled operator station, a plant-wide closed-circuit television, a printer, and a fire alarm panel. There is an engineer room, a locker room and a handover room around the central control room. The electronic equipments of the two sets of units are respectively arranged on the left and right sides of the centralized control room of 8 meters. The DCS joints, power supply disks and electrical M are mainly arranged.
The control system cabinet and electrical equipment of the gas turbine are arranged in the local control room of the gas turbine. At the bottom of the waste heat boiler, there are control booths, some thermal control power distribution boxes for waste heat boilers, control cabinets for waste heat boiler dosing systems, and electrical power distribution cabinets for waste heat boilers. Part of the turbine thermal control distribution box is located in the 8-meter operation layer of the turbine room.
All necessary instruments and control devices for the natural gas pressure control station are supplied by the manufacturer in a complete set to realize on-site monitoring and control. Important signals are sent to the DCS in a hard-wired manner.
3. Control System Functions 3.1 Distributed Control System (DCS)
The control range of the Crew System includes the machine, furnace, electricity, and auxiliary systems that are directly related to the unit. The distributed control system (DCS) of the unit is the main control equipment for the entire unit, including the operator station in the control room and the control cabinet between the electronic equipment. DCS and back-up conventional control instruments (machines, furnaces, emergency stop buttons, etc. installed on the console), local control instruments (including local instruments, and independent local control systems supplied by the main equipment manufacturer) ) Constitute a unitary unit control system to achieve centralized and unified monitoring and centralized control of the unit. The unit DCS system is configured as follows:
A data acquisition and processing system (DAS)
An analog control system (MCS)
A sequential control system (SCS)
A bypass control system (BPS)
DCS sets the public network of the two units. The power utility part of the plant and the circulating water pump house (using remote I/O) include the public DCS network. The monitoring and operation can be performed by the unit DCS operator station of unit #1 or unit #2, respectively (operating considering that the two units are locked to each other). The transformer and generator control system is integrated into the DCS. The controllers, network interface devices, and other important modules in the DCS system are all redundant. The DCS data communication system connects each distributed processing unit, 1/0 processing system, human-machine interface and system external devices to ensure system communication between the various parts. The DCS communication highway is redundantly configured.
The DCS system is equipped with a separate GPS device.
3.2 Gas Engine Control System MARK-VI
The gas turbine uses GE's MARK-VI control system. MARK-VI has the function of automatic starting, loading and stopping of the unit. At the same time, it has perfect monitoring protection and automatic display and recording device. The unit can also add or subtract the load manually. In the same period, the grid-connected device is installed on the generator control panel.
The MARK-VI control system is the latest generation in the speedtronic series. It has accumulated more than 40 years of successful experience in the combustion engine and its control. The MARK-VI control system is equipped with three control hardware and software identical control modules And And the corresponding I/O board. When one control module fails, the other two can still operate normally. The MARK-VI uses a more powerful and faster Intel Celeron 300MHz microprocessor. The MARK-VI also has an independent protection module. , ^ MARK-VI control core. They complete all key control algorithms, sequence programs, and major protection functions. They collect data and generate most alarms. They receive input signals from various configurations of redundant sensors. Each control module not only sends information to the I/ONET network, but also receives signals from the other two modules from the I/ONET network and completes 2/3 software voting to determine the real-time operation of the device.
3.2.1 Gas turbine protection 1) Overspeed protection function 2) Overtemperature protection function 3) Vibration detection and protection 4) Flame detection and protection 5) Fire detection and protection 6) Emergency shutdown 7) Lubrication protection 3.2.2 Control of gas turbine 1) Speed ​​and load control 2) Temperature control 3) Inlet guide vane control 3.3 DCS interface with MARK-VI and other systems The control of the gas turbine is performed by the MARK-VI system, with one exception between the DCS system and the MARK-VI system The words are hard-wired. Most of the signals are in GSM mode. The Ethernet is used to display the DCS system and collect history.
The communication of the pressure regulating station adopts the 485 serial port modbus protocol to receive real-time data and enter the public DCS system. The communication of the DC panel and UPS system adopts the 485 serial port CDT protocol to receive real-time data and enter the DCS system of the unit unit.
4. Conclusion The combined cycle generator set features flexible combination and fast start-up speed. In order to adapt to the operation and start-up of the combined-cycle generating unit and fully exploit the characteristics of the combined cycle, the control system of the combined combined cycle generating unit is required to have high reliability and adaptability.
Usually the gas turbine control system is supplied with the main equipment, and its control range covers only the gas turbine body. The control of waste heat boilers and steam turbines and their auxiliary engines is implemented by DCS. The coordinated control of the combined cycle generating unit is to organically coordinate the various process systems and related equipment in various conditions of the simulation control and sequence control to achieve: rapid response to the load instructions given in the transfer, shorten the unit The start-up time, to mention the reliability of the unit. This has higher requirements for the unit DCS.
We believe that with the development of control technology, the integrated circulation control system using integrated control systems is just around the corner.
Thermal Control Design of Gas-Steam Combined Cycle Power Plant
1. Overview Compared with coal-fired thermal power generation units, gas-steam combined cycle power generating units have the characteristics of short construction period, low initial investment, high thermal efficiency, and energy saving and environmental protection. In recent years, gas-steam combined cycle generator sets have been obtained at home and abroad. Rapid development. ,