Relationship between heat-insulation status and smoke exhaust performance of chimney in gas-fired boiler houses

Analyses and calculates the relationship between heat-insulation status and smoke exhaust performance of chimney in a gas-fired boiler house in Beijing. The results show that the smoke exhaust performance descends with the thickness reducing of heat-insulation layer, and the influence is more remarkable when the thickness is small. For the designed smoke flow, the draft is less than the resistance force of smoke flow when the heat-insulation thickness is less than 15 mm, and the improvement is small when the thickness is over 20 mm.