Abstract: A novel pulse-type hood has been developed to improve particle fluidization quality during peak-shaving operation of circulating fluidized bed (CFB) boilers, with numerical simulations conducted for research. Results indicate that a sufficient pulsation effect is still achieved when the air flow ratio is below 40%, and the pulsation intensity increases with the rise in air flow ratio above 40%. Under full air flow rate conditions, when the simulated air temperatures are 20, 100, and 250 ℃, the pressure drops across the inlet and outlet of the pulse-type hood are measured to be 2.31, 4.03, and 5.65 kPa, respectively. When the air flows inside the pulse-type hood, localized acceleration occurs at positions such as the contraction section and the chamber of Helmholtz oscillation cavity. The "raindrop-shaped" trajectory of the outlet jet is identified as the main reason for the formation of fluidization dead zones at the top of the hood. Significant pressure drops are caused by positions such as the small orifices in the inner core, which are also the core sources of the overall resistance of pulse-type hood. It has been found through optimization that when the number of openings in the outer cover of the hood is 10, both good fluidization effects can be ensured and the accumulation of particles at the top can be prevented.