【Weekly Topic】Discussing the coking issue in the heating furnaces of coking units
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This post was last edited by yuzp000 on 2015-6-20 09:06: [Weekly Topic] Prevention of coking in coke ovens in coking units! Among the equipment in a coking plant, the coking furnace is one of the most critical components. Given the challenging properties of the raw materials processed, let’s discuss together how to ensure its smooth operation as well as how to carry out regular maintenance in order to extend its operational lifespan. 1. What strategies do you think can be used for optimized operation during steady production to extend the service life of the coking furnace? 2. Discuss the preventive measures you take to avoid coking in the heating furnace tubes 3. Discuss how you maintain and service the coking furnace in your daily operations? Active participants in the user community will receive a reward of 5-20 wealth points; those who submit excellent responses will get a red flower and a reward of 20-50 wealth points! All sailors are welcome to participate actively!
I’m not from the coking industry; I’ve only used heat transfer oil furnaces (that run on coal or gas). First of all, the fuel must be clean and free from any chemical waste. If some companies mix in such waste materials, like used activated carbon, it will exacerbate coking, reduce the efficiency of heat exchange, and even lead to excessively high local temperatures, which can damage the grates and cause them to expand or break. It cannot burn under positive pressure; the amount of air supplied and the amount of air drawn off must be matched to ensure complete combustion. The fuel supply volume for gas should match the air flow volume; the atomizer should be cleaned regularly to prevent blockages, and its pressure should be moderate, not too low. The purge pressure should be high, and the time sufficient.
The daily operation of the heating furnace must be carried out carefully; all adjustments need to be made precisely. The temperature should be increased slowly, without exceeding the allowed limits, to ensure that there is no interruption in the supply of material or water (or steam) to the furnace. Additionally, the properties and pressure of the fuel must remain stable. Observe the flame regularly to prevent it from touching the furnace tubes, and adjust it using the air valves and flue dampers. To ensure accurate instrument readings, high-precision instruments should be used so that the deviation between the measured temperature and the actual temperature is minimized. The temperature instruments used for control should have backup instruments and testing ports; both types of instruments should provide alerts for any deviations, and high-precision instruments should be used for measurements when necessary. A mass flow meter is installed at the furnace outlet for measurement, while differential pressure transmitters are installed at the inlet and outlet to measure the pressure difference; by performing calculations, the flow velocity of the material inside the furnace tubes can be determined. The flow velocity in these tubes is controlled to remain as close as possible to the upper limit, within the allowable range. A pressure control valve is added at the furnace outlet to regulate the pressure in the furnace tubes, enabling operation at high pressures. Once it is detected that the furnace tubes are starting to coking, coking should be arranged as soon as possible depending on the production situation.
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