1. Circulation fluidized bed boilers: 1, flowing concepts: when the gas flows through the solid particles at a certain speed, the force of the gas on the solid particles is balanced with other external forces (gravity, friction, etc.) to which the solids are exposed, the solid particles display a similar liquid state or when the solid particles are in contact with the gas, which is called fluidization. The concept of circulation: internal and external cycles; a characteristic of the movement within the circular fluidized bed is the concentration of particles, which, because of their increased weight, have greater freedom of deposition speed, and, at a certain rate of air flow, large particles are not blown up, but are moving backwards along the stove wall. In the process of downward flow, these particles produce larger relative speeds of air consolidation, which are then dispersed into fine particles by rising currents, which in turn are driven from the heart of the furnace, which in the course of their upturn are then brought together into groups of particles, which are deposited along the surrounding furnace walls, and which accumulate, sink, blow, rise and reassembly, known as the inner cycle. Circulation fluidized bed boilers consist of furnaces, separators and respirators as a large cycle system. The material brought into the separators by the flue gas, the relatively fine material (less than 0. 1 mm) excreted with the flue gas, the thicker circulatory material fell to the recycler, the scalding leg returned to the furnace, maintaining the flow of the boiler, known as external circulation. 3. Reverters and work processes: first, the continuous and steady return to the furnace of the circulatory material that separates the cyclone separators, and second, the provision of seals between the negative pressurized cyclone separators and the active furnace chamber to avoid short-range flue gas routes. Otherwise, the smoke from the furnace will reverse to the separators. Modality: the respirator valves are self-balancing by setting a certain level of material in the lower tube of the separators, and the pressure is self-balancing, and the return of materials is driven by different ducts of the up and down segments of the respirator, leading to different fluidization of the up and down segments. The returns are provided by three high-pressure flow winders, two of which are operating normally, one of which is available. There are spill control valves to regulate the mother tube pressure. During the start-up process, the refiller does not work when the refiller = 0 because of the natural accumulation of material before the refiller works; when the refiller is put in, the increase in the volume begins when the returner is larger
