Tubes of tubular heating furnaces
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In coal tar processing projects, for the tubular heating furnaces used for tar and industrial naphthalene, what are the advantages and disadvantages of using vertical tubes versus coiled tubes? What materials are generally used?
The devices I have come into contact with are all vertical pipes. The advantages are a simple structure and uniform heating. The downside is high resistance. 1Cr18Ni9Ti is used for tar, while 20G and Cr5Mo are used for industrial naphthalene.
Early domestic tubular furnaces generally used vertical tubes; the advantage was that coking and blockages could be removed, but the resistance was high and the thermal efficiency was low. Most of the new tar processing units installed in recent years use spiral coils, which offer low resistance, thorough heating, and high thermal efficiency; the downside is that once they get clogged, the coils have to be replaced. Our company uses double-helix coils; the material for the radiation section is 0Cr18Ni10Ti, while that for the convection section is 20Cr25Ni
Thank you for the answer. So, which domestic manufacturers of tubular furnaces have good design and processing capabilities? Recommend it, please.
The Second Chemical Engineering Institute has designed many furnaces using foreign technologies, and it has done a good job of absorbing and adapting those technologies; it’s quite good. The heating furnaces produced by Jiangsu Yanshin Group are of good quality; you can get in touch with them to take a look and conduct an inspection
Now, tube furnaces are all made by oneself
The fuel we use is exhaust gas, which has a low calorific value; since this is being used for the first time, we need to find a manufacturer with design capabilities.
Our factory had a tar production workshop in the 1970s, and the tubular furnaces used were of the vertical tube type
The burner should be well-designed and adjusted according to the calorific value and air volume