SDS Naki dry desulfurization process
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SDS dry desulfurization, also known as soda ash desulfurization, uses soda ash as a desulfurizing agent, which is ground into ultra-fine powder with a particle size of ≤20μm. The flue gas from gas boilers is cooled after heat exchange in a gas heater, and then enters the SDS reactor, where it mixes thoroughly with the ultra-fine NaHCO3 powder sprayed by an efficient pneumatic conveying system. Under the action of high-temperature flue gas (above 140°C), NaHCO3 decomposes to produce highly active Na2CO3 and CO2. The highly active Na2CO3 comes into full contact with SO2 and other acidic substances in the flue gas, resulting in chemical reactions that enable the removal of SO2 from the flue gas. Advantages of SDS Naki dry desulfurization technology: 1. Fully dry-process treatment – no need to construct desulfurization towers, no industrial waste generated, and no secondary pollution. 2. The system is simple and suitable for the purification of flue gas with low flow rates and low loads, such as that from gas boilers. 3. It has high desulfurization efficiency, and the by-product of desulfurization is sodium sulfate, which can be utilized effectively. 4. The system is easy to operate, convenient to maintain, and features a high degree of automation. 5. Low investment, low operating costs, and small footprint, making it suitable for desulfurization renovation projects.
It seems that the dry method is still inefficient!
Efficiency isn’t really a big issue; the main thing is to achieve an optimal economic balance
I think CO2 is being somewhat demonized; what about the methane produced by the livestock industry?
The next approach is to address each issue separately; we shouldn’t neglect solving problems in other areas just because one issue hasn’t been resolved. The livestock industry helps meet the demand for meat, but at present there may not be suitable technologies for recovering the methane emitted during production, so large-scale recovery isn’t possible. However, efforts are being made to find another solution: artificial proteins
It seems this technology was available in Canada back around 2010 or so, but its adoption didn’t seem to be very widespread. 20μm powder makes dust removal difficult; nowadays, ultra-low emissions are required, and dust is a major issue. What about the purity of the product and the utilization rate of baking soda?
Do not grind it too fine. Utilization rate > 90%
Reaching a dust removal level of 20um shouldn’t be difficult, right? Nowadays, it’s already possible to achieve very low levels of dust removal in China
The main issue is the high total amount of dust; the requirement for ultra-low emissions is 5mg. Although efficiency can be very high, it’s still possible for the dust level to exceed 5mg. Additionally, small particle sizes are inevitably generated during the grinding process. The larger particles can be removed more easily, while those of smaller size may not be removed to such an extent. To ensure that the dust level stays below 5mg, the dust removal process becomes complex, requiring significant space and investment.