How to solve the problem of water in the boiler fan
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The addition of desulfurizing agents to three boilers in our company for flue gas desulfurization has caused severe water ingress in the exhaust fans, leading to high vibration levels. Moreover, the fan impellers have suffered severe corrosion, requiring frequent shutdowns for replacement. However, due to strong environmental regulations, discharging flue gas without desulfurization does not meet environmental standards; the addition of desulfurizing agents enables the flue gas emissions to meet these standards, but it also introduces many equipment-related problems. I would appreciate the guidance from all the seniors!
This is closely related to damage to the inner wall of the dust collector. Since the dust removal water is acidic, it causes significant corrosion to the anti-corrosion materials on the inner wall, often resulting in large gaps between the stones and disrupting the integrity of the water film. This leads to water droplets splashing, thereby causing the flue gas to contain water. Solutions: 1. Use single-stage impellers as much as possible, as this prevents water from entering the space between the impellers after it has been carried by the flue gas, thus avoiding vibrations in the fan. 2. Regularly inspect the dust collector and apply anti-corrosion treatments to its inner wall to maintain its integrity; epoxy resin is a good choice for such anti-corrosion materials. 3. Consider increasing the height between the ring-shaped water distribution channel and the flue gas outlet. 4. Use electrostatic dust removal equipment. Technical improvement measures for the dust collector: First, a pressure-stabilizing water tank is added; a high-position pressure-stabilizing water tank is installed on the upper platform of the dust collector. By utilizing hydrostatic pressure, it ensures stability in both the water pressure and flow rate at the overflow outlet, so that the overflowing water forms a uniform water film along the wall of the cylinder once it enters it. Second, install a demisting plate at the outlet of the dust collector. As the rotational intensity of the rapidly rotating and rising flue gas increases when it passes through the demisting plate, the water droplets and mist carried in the flue gas are once again flung toward the cylinder wall under the action of centrifugal force; they then flow down along the cylinder wall and merge with the water film on the washing surface, from where they are removed via the ash discharge water. Thanks to effects such as flow redirection and inertial collision provided by the demisting plate, the dust removal efficiency is also improved. With such technical upgrades, it is possible to **reduce the phenomenon of water in the flue gas**. Reposting articles from the Thermoelectric Alliance
This is a result of inadequate design considerations. Previously, the gas was discharged directly; after desulfurization was added at the back, the pressure of the gas being discharged became higher than before, and the steam reached its saturated vapor pressure, which is why water appeared； There are two methods: 1. Raise the flue gas temperature, but it depends on whether the temperature that the fan is designed to handle is suitable ； 2. Add a drying device in front.
First, I need to ask whether it is desulfurization inside the furnace or desulfurization through alkaline scrubbing of the exhaust gases. Only by clarifying this can we provide suggestions to the user based on our own operational experience
Add a drain pipe and a water storage tank at the bottom of the fan.
Is there no complete solution?