How to solve the coking problem in heating furnace nozzles (gas burners)?
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Since the gas used in our workshop comes from the end of the plant’s pipeline network and contains some solid particles, filters have been installed before the gas enters the heating furnace. Yet, the nozzles of the heating furnace still get clogged from time to time; in the most severe cases, half of the gas injection holes in the nozzles are blocked. The burner uses an external mixing gas burner, with the jet hole diameter being approximately 1.5 mm.
The gas can be led out from the main pipeline through a branch line located at the upper part of the main pipeline; this helps to reduce the amount of impurities that enter the device. It also facilitates better liquid removal from the gas tanks inside the device. Additionally, the gas pipelines within the device can be replaced with those made of white steel in order to minimize impurities. At the end of the main gas pipeline, a liquid removal pipeline connected to the flare is installed; this valve is opened periodically to discharge the impurities from the main gas pipeline into the flare line, thereby reducing the amount of such impurities that enter the equipment.
A 1.5mm hole is a bit small. If there is a filter at the inlet, is its filtration precision compatible with that of the nozzle? Is the fuel pressure in front of the nozzle high enough, such as above 0.4 MPa? Poor combustion can also cause soot to clog the nozzles
Is the 3rd floor the High Chemistry area? I wonder which workshop it is? The filter’s precision should be fine; it hardly needs to be cleaned every month. Does this kind of problem occur with the heating furnace on your end?
Generally speaking, gas burners are not prone to coking. Coking usually occurs due to an unsuitable design of the fuel-air mixture. The most common cause of coking in gas burners nowadays is usually the presence of liquids in the fuel gas; during use, some of these liquids remain at the nozzle, and due to flame radiation, coking occurs. This type of coking is relatively difficult to eliminate unless the liquids in the fuel are removed.
Things like this are rather annoying; the simplest solution is to add two layers of filtration, one coarse filter and one fine filter.
Coking usually results from an excessively low ash melting point of the fuel. In addition to filtering, it is also necessary to investigate the issues at the gas source. 1. If the gas pressure is too low, it needs to be increased to prevent premature combustion or backflow, which can lead to coking at the burner. 2. Uneven mixing of the combustion air with the gas, or insufficient oxygen levels, can cause incomplete combustion, ultimately resulting in coking.