Distribution of bed material size in circulating fluidized bed boiler

The shorter the ignition time from the ignition to the exit of the circulating fluidized bed boiler, the less fuel consumption the boiler starts, so the early exit of the fuel as soon as possible is also the main means of starting fuel economy.

During the start-up process, the wind temperature entering the furnace is also an important factor in controlling fuel consumption due to the large amount of wind required for fluidization and combustion support. At the same time as starting the fan, the first and second air heaters are put into the air to maximize the temperature of the furnace.

The particle size distribution of the bed material should be reasonable. The lubricating oil attracts too many large particles, the required fluidized air volume is large, the power consumption is large, fluidized stratification is prone to occur, and the late load lifting speed is slow, but the fine particles leaving the bed are less. The convective heat transfer is less, and the heat storage capacity of the coarse particles is greater than the heat storage capacity of the fine particles, so that the heat share of the dense phase zone is large, the bed temperature is easy to increase, and the fuel economy is favorable; During the start-up process, fine particles may be carried into a dilute phase zone in large quantities, participate in the large circulation in the furnace, and fully exchange heat with the water-cooled wall of the dilute phase zone, and the load-lifting speed is fast in the later stage, but the bed temperature rises. It becomes very slow, and it takes a long time to reach the minimum coal injection temperature, and fuel consumption increases. Therefore, the reasonable bed material particle size is also an important means of starting successfully, saving fuel and saving electricity, oil-cooled electric drum. Our factory currently starts the bed material particle size control.

The bed material is the main heat carrier of the circulating fluidized bed boiler. The material layer is too thin, which is easy to cause uneven distribution of the air, resulting in partial blow-through and failure of ignition. The temperature field of the bed material is not uniform, and the possibility of coking is increased. The material layer is too thick, although it will increase the heat storage capacity of the bed material in the furnace, the bed temperature is relatively stable, but the total heat storage of the bed material is increased, the ignition heating time is too long, and the heat and power loss is increased. Therefore, a reasonable choice of starting the bed material can reduce fuel consumption and power consumption. According to the actual exploration, the bed pressure is controlled at 5 kPa at startup, and the bed thickness at rest is about 600 mm.

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