pds soda ash desulfurization corrosion

Corrosion caused by hydrogen sulfide in the process gas: enhance the absorption of sulfur compounds, improve the regeneration of the desulfurization solution, adjust the parameters of this solution, and control the occurrence of side reactions

1. The content of by-products in the system should be analyzed to determine whether the Na2SO4 level remains above 40 g/l for an extended period; if it is too high, it will accelerate corrosion in the system. 2. The system should be adjusted as soon as possible to reduce its side effects and minimize the formation of Na2SO4. 3. Consider changing the pipeline material. 4. If adjustments do not yield results over a long period, it is recommended to try other desulfurization methods to achieve better outcomes.

Please address the issues related to the regeneration process and the residence time of the desulfurization solution in the rich liquid tank; the formation of by-products can be controlled. Tell us your detailed situation and everyone will help analyze it for you.

This post was last edited by zhp1389 on 2009-7-17 at 11:02. The main factor causing pipe corrosion is high levels of by-products; it is caused by improper operation of the sulfur melting tank and too high temperatures in the desulfurization fluid circulation. The temperature in the sulfur melting tank is too high, the operation time is long, the rate of side reactions increases, and the content of by-products is too high. Under such circumstances, if it is returned to the desulfurization liquid system, it will inevitably lead to a high level of by-products in the entire system, causing the desulfurization liquid to turn black and dull, preventing foam formation, and resulting in the precipitation of gray-green crystals that cause severe corrosion to equipment, valves, and pipes. A high content of by-products has the following drawbacks: Impact of by-product formation on desulfurization ● The accumulation of by-products increases the viscosity of the desulfurization liquid, affecting mass transfer and the formation of sulfur foam. ●The accumulation of by-products will precipitate out of the solution, disrupting normal operating conditions and increasing the resistance in the desulfurization tower; in worse cases, it can completely block the tower and pipelines, bringing production to a standstill. ●Soda ash (ammonia) consumption increases, but the washing efficiency of the desulfurization solution drops sharply, resulting in a decline in desulfurization and sulfur recovery rates. ●High concentrations of (NH4)2SO4 and other by-products, or their precipitation, can also cause corrosion of carbon steel equipment. Measures: I believe that, based on the selection of more mature desulfurization agents, the main factor affecting the stability of the desulfurization system is the continuous increase in side reactions and their resulting by-products. No matter how carefully such reactions are controlled, they are still inevitable. The so-called stability is only short-term stability; the true solution lies in completely eliminating the amount of by-products generated as a result of these inevitable side reactions! The desulfurization liquid can be subjected to extraction with crude salt (mixed salt), and the desalted desulfurization liquid can be reused. This not only addresses the issue of increased by-products, keeping the content of by-products in the desulfurization solution stable, but also generates economic benefits. Low investment, small land footprint, easy operation – it completely solves the problems of environmental protection and low desulfurization efficiency. Other methods are neither thorough nor free of negative effects; they only provide temporary solutions rather than addressing the root cause. Speak up if there’s anything! My email address is: zhp1389@126.com