Design of the height of the flue gas duct in the calcination furnace.

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Design of the height of the flue gas duct in the calcination furnace. Process description: 500 kg/h of solid particles are fed into the calcination furnace, with a loading rate of approximately 60%. The calcination temperature is 700°C; nitrogen gas is used during the calcination process, and the furnace is equipped with a stirrer. Question: During the calcination process, solid particle dust can escape from the exhaust pipe, so an exhaust pipe of a certain height needs to be designed to collect this dust. The medium in the calcination furnace is solid particles: 5-100um. Particle density: 1800 kg/m3. Kiln exhaust pipeline: DN150. Air volume of inlet air (nitrogen) to the calcination furnace: 60 Nm3/h. I want to know what height the exhaust pipe should be designed to have in order to prevent dust from escaping How to design calculations?