The coal fired CFB boiler adopts a natural circulation method, which is generally divided into two shafts at the front and the rear. The front shaft is a general suspension structure, surrounded by membrane water-cooling walls. From bottom to top, they are the primary air chamber, dense phase area, and dilute phase area. The tail flue consists of high temperature superheater, low temperature superheater, economizer, and an air preheater from top to bottom. The tail shaft adopts a supporting structure, and the two shafts are connected by a vertical cyclone separator, and the lower part of the separator is connected with a return device and an ash cooler.
The Coal Fired CFB Boiler Body Structure
The boiler adopts a natural circulation method, which is generally divided into two shafts at the front and the rear. The front shaft is a general suspension structure, surrounded by membrane water-cooling walls. From bottom to top, they are the primary air chamber, dense phase area, and dilute phase area. The tail flue consists of high temperature superheater, low temperature superheater, an economizer, and an air preheater from top to bottom. The tail shaft adopts a supporting structure, and the two shafts are connected by a vertical cyclone separator, and the lower part of the separator is connected with a return device and an ash cooler.
Composition of The Coal Fired CFB Boiler System
The coal fired circulating fluidized bed boiler (coal fired CFB boiler) system usually consists of a fluidized bed combustion chamber (furnace), circulating ash separator, fly ash return device, tail heating surface, auxiliary equipment, etc.
It is composed of a combustion system and a steam-water system, The fuel completes the combustion process in the combustion system of the boiler and converts the chemical energy into the heat energy of the flue gas through combustion to heat the water. The function of the steam-water system is to absorb the heat of the flue gas through the heating surface and complete the process of changing the working fluid from water to saturated steam and then to superheated steam.
Combustion System of the coal fired CFB Boiler
The flue gas air system of a circulating fluidized bed boiler is a general term for the air (cold and hot air) system and flue gas system of a circulating fluidized bed boiler. The air system is mainly composed of two parts: combustion air and conveying air. The former includes primary air, secondary air, coal sowing air (also known as tertiary air), and the latter includes return air, limestone conveying air and cooling air, etc.
Steam Water System of the coal fired CFB Boiler
The steam and water system should be composed of a CFB boiler, water treatment device, feedwater pump, steam header, deaerator (must be matched), and so on.
The control system of the coal fired CFB Boiler
Both the flue air system and the steam water system need a control system to help them realize it. CFB boiler control mode will be chosen DCS control or PLC+PC control.
Its electronic control system adopts a DCS control system. Through the relationship between the control variables.The main control variable acts as the secondary control variable. During the operation of the control system, if the secondary control variable has an error, the main control variable can be compensated in time.
Functions of the coal fired CFB Boiler control system
★ Real-time monitoring function, real-time monitoring of combustion system and steam-water system, and interlocking in case of abnormality, while the circulation system runs continuously to ensure safe and stable production.
★ Self-inspection function of the control system: temperature, pressure, liquid level, and other sensor fault self-inspection, internal fault self-inspection of the control device, fault alarm, and interlock protection.
★ Real-time analysis function for circulating fluidized bed boiler operation.
★ Collect, record, save, and manage important information and data functions related to the system.
The Remote Instrument Valves used in the Control System include temperature sensors, pressure transmitters, pressure controllers, different pressure transmitters, flowmeters, etc.
The coal fired CFB boiler control system is a collection of boiler electrical control components, a center for collecting and processing boiler operating signals, and an operation platform for sending execution instructions to each execution unit of the boiler.
If you want the coal fired CFB boiler system to realize the IoT(Internet of Things)service for the CFB boiler system, we can provide you with this service when making the control system.
The IoT system for boiler system adopts a layered structure design, namely data collection layer(M BOX), cloud platform(M SERVICE), and application layer(MYZT application system).
Coal Fired CFB Boiler Control Modes of Operation: Automatic and Manual
a) The coal fired CFB boiler in automatic mode is in a fully automatic operation state,
b) Manual mode: The operation of the coal fired CFB boiler equipment is controlled by manual operation. Under normal circumstances, the boiler should operate in an automatic operation state. In special cases, it will be required to switch to the manual state.
Control system of the coal fired CFB boiler detection data sources: burners, temperature sensors, pressure transmitters, pressure controllers, liquid level gauges, flow meters, electric regulating valves, and other remote instrument valves.
Types of control cabinets for waste heat boilers: wall-mounted control cabinet, podium control cabinet, MCC vertical control cabinet, piano-style control cabinet, positive pressure explosion-proof control cabinets, and three-proof control cabinet.Each control cabinet we leave the factory has a unique number, and it has the function of mobile phone viewing. You can see the operating status of the boiler in real-time, such as temperature, water level, pressure, alarm record, etc., but the actual operation still needs to be completed by the staff in the boiler room.
Features of the coal fired CFB boilers
★ Low temperature combustion ★ High combustion efficiency
★ Efficient desulfurization ★ Low emissions of nitrogen oxides (NOX)
★ High combustion intensity and small furnace cross-sectional area ★ Fewer coal points
★ The load adjustment range is large and the load adjustment is fast ★ Wide fuel adaptability
★ It is easy to realize the comprehensive utilization of ash and slag ★ The fuel pretreatment system is simple
★ There is no buried pipe heating surface in the bed
Company Profile
CN BOILER ENGINEERING SOLUTION LLC is a comprehensive service provider of thermal energy systems in China, devotes to providing for customer one-step thermal energy system solutions by safety, save energy, environmental,intelligent and reliable. Main products include industrial boilers(hot water boilers, steam boilers, thermal oil boilers, waste heat boilers and CFB boilers), steam generator(electric steam generator, electric hot water generator), intelligent control system by PLC control, PLC+PC control or DCS control, remote instrument and valves and so on.The control system includes industrial boiler control system(oil fired boilers, gas fired boilers, biomass fired boilers, coal fired boilers, electric boilers, waster heat boilers, CFB boilers), PLC deaerator control system, condensate recovery system, reactor control system, heating exchanger control system, hot air boiler control system etc.
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