Flue gas internal circulation put into use
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Our company’s flue gas internal circulation system has just been put into use; it involves injecting the exhaust gases from the flues into an upward-flowing exhaust gas tray where they mix with air, thereby enabling lean combustion. Are there any coking plants that have been in use for a long time? Please describe the situation after their use, mentioning both the advantages and disadvantages.
We’re about to start using this. Did you make it yourselves or have it made elsewhere? How is the quality?
We also plan to get started; I heard it works well.
Is there any material on this topic? I want to learn *it*.
Which teacher has the materials? Let’s share them together*
We have been using it for a few months now, and it still works. Since we installed it ourselves after a visit, we rushed things and made some simplifications; the selection and installation of the equipment weren’t proper enough, which affects its performance. You must pay close attention to this.
Have you encountered a situation where, even when the fan speed reaches 40 Hz, the nitrogen oxide levels are still not within the specified limits? With an outlet pressure of 1200 Pa, the nitrogen oxides levels still don’t drop; it only helps to turn over the flap of furnace No. 2 (which is not in use) and open the flue drying holes.
Could you explain how you regulate nitrogen oxides? Thank you
There are only advantages, no disadvantages. Improve upward heating, save gas, reduce nitrogen oxides, etc., and enhance the level of automatic control.
We use low-nitrogen combustion combined with SCR; in the first step, low-nitrogen combustion is used to keep nitrogen oxides below 500, and then SCR is employed to reduce them further to below 150.
The pressure before the exhaust gas is recirculated to the exhaust gas control butterfly valve (DN80, opening degree of 1/4–1/3) should be kept at around 1 KPa. Samples of the exhaust gas should be taken from the observation ports, and the excess factor should be maintained at 1.15±0.05; this will result in a reduction of NOX levels by 150–200. Give it a try.