Advantages and disadvantages of medium-voltage conversion and low-voltage conversion.....

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The formation of by-products in the desulfurization solution is due to: 1. Poor regeneration and low temperatures, which lead to the formation of by-products； 2. Excessive addition of alkali also produces by-products salts ； 3. The carbon dioxide content in the gas is high.

The information I found states that high temperatures lead to the formation of more by-products. Why does adding too much alkali result in by-products? The manufacturing process requires a certain ratio between sodium carbonate and sodium bicarbonate, and adding more alkali is done to achieve this ratio. Also, the high carbon dioxide content in the gas is inevitable; semi-water gas contains a large amount of carbon dioxide.

It is recommended to check the suction volume of the regenerative injector, reduce the oxygen content in the semi-water gas entering the desulfurization tower, and lower the temperature of the liquid exiting the sulfur melting tank – all of these measures can help alleviate the problem of overflow.

This post was last edited by 654262293 on 2014-1-10 at 16:30. It should be about the advantages and disadvantages of medium-temperature conversion and full-low conversion. Advantages of full low-temperature conversion: 1. Significant energy savings, as the inlet temperature at each stage of the low-temperature converter is 200°C; the bed temperature is 100–300°C lower than that in traditional converters, which facilitates the equilibrium of the conversion reaction. The vapor-to-gas ratio is reduced, resulting in a significant decrease in steam consumption; it has the lowest steam consumption among several conversion processes. 2. It features high heat recovery efficiency and low energy loss; the heat exchange area of the heat exchange equipment can be reduced by about 1/2. 3. The requirement for the H₂S content in semi-water gas should be correspondingly reduced. 4. Compared with the high-variation process, the catalyst loading can be reduced by more than half, which lowers the bed resistance of the shift converter and reduces compression power consumption. 5. The conversion rate of organic sulfur is as high as 98%–99%, which facilitates the removal of sulfides in subsequent processes, thereby helping to protect the catalysts used in methanol and ammonia synthesis. 6. High conversion rate, with the CO content in the converted gas dapat be reduced to below 1%. Disadvantage: Since the inlet temperature of the low-temperature converter is around 200°C, the oil contaminants carried in the gas do not volatilize easily, which can lead to poisoning and deactivation of the low-temperature converter catalyst. Therefore, adsorbents and antidotes must be loaded on top of a catalyst with low variability. 2. The increased H2S content at the low-temperature inlet makes it difficult to remove H2S in subsequent processes. 3. Low-temperature catalysts have high requirements for the oxygen content in semi-water gas

Advantages of medium-temperature shift: 1. Due to the higher operating temperature, it is not very sensitive to oil contamination. 2. There is no desulfurization phenomenon as in catalysts with a fully low level of sulfur, so it is desirable to have as low an inlet hydrogen sulfide level as possible. Disadvantages: 1. High operating temperature, resulting in severe system corrosion. 2. High steam consumption. 3. High operational difficulty. 4. The hot water circulation volume is large, resulting in high power consumption.

With a high amount of by-products, it is possible to consider using plate and frame filter presses to filter the sulfur foam, and to switch from continuous sulfur melting to intermittent sulfur melting.