Regarding the protective air for reaction furnaces and incinerators, is it better to use nitrogen or untreated air? Why do nitrogen levels increase when nitrogen is used? Are there any requirements regarding the use of wind protection?

Please use your question as the topic, rather than the name of the device or process as the title. Thank you for your cooperation! :handshake

Under normal conditions, we use unpurified air here. There are many reasons for the increase in nitrogen oxides: temperature, upstream components, and so on. The use of draft protection is mainly to ensure proper airflow and prevent the pipes from getting blocked. I recommend that you read more books on \"Sulfur Recovery Technologies and Engineering\"; it will be very helpful to you. They are also available on forums, so you can search for them on your own!

This post was last edited by fpiliuwei on 2020-6-16 at 15:30. It is recommended to use N2 for purging; gases containing O2 should not be used for such purging purposes. If the purge gas contains O2, although in small amounts, this O2 will participate in the reaction. Local hot spots are likely to occur near the purge pipe outlet. One more thing to add: purge protection is a very critical factor for the stable and efficient operation of a plant. In several projects I’ve worked on, especially those involving pure oxygen, unplanned plant shutdowns occurred due to inadequate purge procedures. A rotameter should be installed on the purging pipeline, and it is necessary to regularly inspect this purging flow meter to ensure the flow rate of the purging gas. Once again, the flow rate of the purging gas must not be lower than the values specified by the manufacturer. The formation of NOX during combustion is conditional; generally, in the high-temperature areas of sulfur production furnaces (with temperatures above 900 degrees), oxygen-deficient combustion helps to suppress the formation of NOX. In the incinerator, since the furnace temperature is below 800 degrees, the temperature conditions required for NOX formation are not met, and the effect of N2 in the purge gas on NOX emissions can be disregarded. The above is for your reference only.

The reply that \"practice leads to true knowledge\" – I give it a thumbs up!

Yes! It has different names; in some places it’s also called reverse airflow!

Nitrogen is better; it provides better protection. If energy consumption is a concern, use unfiltered air or filtered air.