1. Steady state design theory to ensure various performances
The steady state design theory provides a theoretical basis for the structural design and performance calculation of the boiler. After the design according to the steady state theory, the layout of heating surfaces at all levels of the boiler is more reasonable, the combustion is more complete, the temperature field is more uniform, and the operating parameters are highly consistent with the design parameters.
2. Flow state reconstruction theory to reduce boiler power consumption and wear
Flow State reconstruction theory clarifies the quantitative relationship between bed material and various parameters and indexes of boiler operation. For different fuels, the fluidized bed boiler can regulate the proportion of coarse and fine particles in the circulating materials by improving the separation efficiency of the separator, and reduce the bed stock within a certain range for low bed pressure operation.
The pressure head of the primary and secondary air fans of the boiler reduces, and the power consumption of the fans decreases. The wear of the furnace chamber decreases significantly after the bed inventory is reduced and the circulating ash becomes finer. Through the flow state reconstruction, the fan power consumption of the latest generation circulating fluidized bed boiler can be reduced by 30% compared with the traditional boiler, and the boiler’s own power consumption can be the same as that of the pulverized coal boiler.
3. Low nitrogen, environmental protection and high efficiency desulfurization
The latest generation of circulating fluidized bed boiler has controlled the initial NOx emission of the boiler within 50-120mg/Nm3 by means of flow state reconstruction theory, low temperature combustion, grading air supply technology, air distribution optimization design and other methods, and the ultra-low emission can be achieved only when SNCR is used. At the same time, when Ca/S is 1.8-2, the desulfurization efficiency of limestone in the furnace can reach more than 90%-98%, saving a lot of investment costs and operation costs for users.
4. High-efficient separating technology technology to guarantee the boiler performance
High-efficient separating technology is the guarantee for the realization of steady state design and flow state reconstruction theory.
The latest generation of fluidized bed boiler has achieved a separation efficiency of more than 99.6% by optimizing the structure of the separator, and the separation diameter d50 reaches 10-15μm and d99≤100μm.
High efficienct separation technology effectively reduces material granularity, improves material concentration in the upper part of the furnace, reduces wear and tear, improves combustion efficiency, improves limestone utilization and furnace desulfurization efficiency. The latest generation of circulating fluidized bed boilers can run for more than 8,200 hours per year, and the overhaul period is more than 5 years, and its reliability is guaranteed.
5. Novel funnel cap and air distributor
The latest generation of circulating fluidized bed boiler adopts the company’s new patented technology of funnel cap, with more uniform air distribution, stronger fluidization, no stratification of bed material, and effective prevention of ash dumping, with self-cleaning function of funnel cap and simple installation and maintenance.
Optimizing the design of the air distribution plate and strengthening the air distribution at the four corners of the air distribution board and around the wall to fundamentally solve the uneven fluidization at the four corners and around, and the problem of local high temperature and local low temperature coking. Changing the arrangement of the air cap at the slag drop to achieve the effect of not blocking the slag, releasing the slag more smoothly and selecting the slag more finely.