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Firebox Average Temperature


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#1 shvet1

shvet1

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Posted 11 May 2020 - 01:38 AM

Good day, forum
 
I have a question concerning firebox average temperature. I have an exhaust from naphtha reforming catalyst regenerator containing some degree of dioxines. This fluid is routed to radiant section of naphtha reforming fired heater via a nozzle in the bottom of firebox where it is mixed with flue gas. Estimated bridgewall temperature is 770 °C.
 
I have to assess % of destruction of dioxines taking into account temperature, % of O2 and residence time. For this purpose, I need average temperature of flue gas in firebox.
 
Q1: Please share how to assess temperature(s) in forebox based on bridgewall.
 
Q2: Licensor stated that it is a customary industry practice in European region to routed this dioxines-containing exhaust to the firebox of a fired heater. I can not find traces of this practice in google, please share a discussion or your experience is this method efficient or this is just a way to lower down concentration of dioxins below measurement limit.
 
Q3: In the past, I have read emission of dioxins has become a cause of shutdown of naphtha catalytic reformers in California and New-York, but now I can not find this texts. Please help with clues.


#2 breizh

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Posted 13 May 2020 - 01:25 AM

Hi ,

For Q1 , you may consider an infrared camera to assess the average temperature . I 've been using this type of equipment to determine the wall temperature on a vertical lime kiln .

For Q2 , it seems to me that the temperature should be over 850 C to destroy the dioxins , let you google dioxin temperature destruction .

hope this is helping you.

Breizh 


Edited by breizh, 13 May 2020 - 01:29 AM.


#3 shvet1

shvet1

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Posted 13 May 2020 - 07:58 AM

Hi ,

For Q1 , you may consider an infrared camera to assess the average temperature . I 've been using this type of equipment to determine the wall temperature on a vertical lime kiln .

For Q2 , it seems to me that the temperature should be over 850 C to destroy the dioxins , let you google dioxin temperature destruction .

hope this is helping you.

Breizh 

Q1: Fired heater has not been bought yet. The question concerns environmental assessment of impact on adjacent residential area.
Q2: 
a. As I found out reference parameters for guaranteed destruction are 1200°C@3%vO2@2sec which are hardly to be implemented to a firebox of a refinery fired heater.
b. I am not sure that surface temperature of refractory and coils can be converted to average temperature of flue gas.





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