What combination of processes is a reasonable integrated approach for flue gas desulfurization and denitrification in catalytic cracking?
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What combination of processes is a reasonable integrated approach for flue gas desulfurization and denitrification in catalytic cracking? Currently, for flue gas desulfurization and denitrification in catalytic cracking, two separate processes are mostly forced to be combined to form what is known as an integrated desulfurization and denitrification process. However, there are many problems; for example, in SCR denitrification, ammonia escape (at a slight excess level) can cause the ammonia nitrogen content in the saline wastewater generated by sodium-based flue gas desulfurization (EDV or WGS) to exceed acceptable levels, among other issues. The ammonia-based desulfurization and denitrification process can be considered a truly integrated process, but it is not widely used at present; it is necessary to address the issue of ammonia leakage properly...
We use the Berg EDV5000 wet desulfurization process along with ozone-based low-temperature oxidation for denitration; this process is very simple and reliable, and no special issues have occurred during a full cycle of operation.
The FCC integrated flue gas desulfurization and denitration technology widely used abroad currently combines wet method for SOx removal with selective catalytic reduction for NOx removal, offering an integrated solution for simultaneous desulfurization, denitration, and particulate removal
The ozone method for denitration faces the issue of excessive nitrogen levels in saline wastewater.
So which brand do you use for your ozone generators? Is it reliable to run?
OP, in my opinion, regarding SCR denitration, the focus should be more on the bed pressure drop issue and ammonia escape. Ammonia escape not only affects the ammonia nitrogen content in saline wastewater; more directly, it leads to the formation of ABS in the economizer section. Causing corrosion and perforation of the furnace tubes
Agree with the opinion above; are there any real-world examples to illustrate this?
There are no issues with the ozone generator; it’s just that the oxygen concentration meter and the ozone concentration meter, which are online instruments, have a high failure rate. Failures in these two online instruments can easily cause the ozone generator to shut down as part of an interlock mechanism. The manufacturers of ozone generators can tell you privately, to avoid the appearance of advertising.
Strange, why hasn’t anyone mentioned CANSOLV’s cleaning and renewable desulfurization technology?