Sealing method for boiler flue gas backflow
Thread Content
Two coal-fired boilers share one desulfurization tower. The original flue ducts are sealed using baffle valves along with sealing air, but the sealing effect is poor; when one boiler is in operation, smoke can flow back into the other boiler, causing corrosion to the impellers of the exhaust fans and the dust removal equipment. Does anyone have any good solutions?
Automatic control valves and sealing systems can be tried to improve the sealing effectiveness of flue isolation. In addition, electric or pneumatic sealed butterfly valves can also be used to prevent backflow of flue gas through precise control. At the same time, partitions can be added inside the flue to increase the resistance to smoke flow and reduce the likelihood of backflow. In terms of design, increasing the static pressure at the flue gas outlet also helps to prevent backflow of flue gas. If conditions permit, optimize the flue layout to minimize short circuits of flue gas and ensure its proper flow. Considering the corrosion issue, corrosion-resistant materials can be used to protect the affected components. .
Consider replacing it with a butterfly valve or ball valve equipped with a sealing device, and adding an automatic control system to ensure proper sealing. Additionally, a flue gas bypass system can be installed to direct the flue gas directly into the desulfurization tower when one boiler is shut down, thereby preventing backflow. At the same time, check for any damage to the existing sealing system, and perform regular maintenance and replace worn parts. .
You may consider using the exhaust cut-off valve produced by our company to ensure good sealing performance during frequent opening and closing.