Find out why, for high-temperature heat treatment processes, the higher the operating temperature, the greater the load on the heating furnace
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The higher the operating temperature for thermal cracking, the greater the load on the heating furnace, with an approximately linear increase. Based on the above analysis, a operating temperature of 240°C is appropriate for the thermal high-temperature process. If the operating temperature for high-temperature pyrolysis is too high, although the hydrogen concentration in the circulating hydrogen increases slightly, the rate of increase is gentle. From the perspective of equipment material selection, when the operating temperature in thermal cracking is above 240°C, higher requirements are placed on the materials used, and the load on the feed heating furnace increases, leading to higher investment costs. If the operating temperature for heat separation is low and the hydrogen concentration in the recycled hydrogen is low, the presence of Cl- ions in the feed oil or injection water will lead to the formation of NH4Cl crystals at low temperatures, causing corrosion of equipment and pipelines; in other words, the resistance to Cl- ion corrosion is low. Therefore, the operating temperature for high-temperature fractionation is set at 240
The higher the temperature of the hot high-boiling fraction, the greater the air cooling load for that fraction, and thus more liquid oil is produced from it. Therefore, there is a quadratic relationship between the feed temperature of T-201 and the temperature of the hot high-boiling fraction.
The higher the temperature of the hot high-boiling fraction, the greater the air cooling load for that fraction, and thus more liquid oil is produced from it. Therefore, there is a quadratic relationship between the feed temperature of T-201 and the temperature of the hot high-boiling fraction.
Higher high-temp fractions should result in a reduced load on the heating furnaces. In full-range hydrogenation, the heat source from these high-temperature fractions provides essential heat for the subsequent units, **thereby reducing the load on the heating furnaces**
Regarding the high-temperature limit for heat treatment, 240 degrees is the conventional value, but this cannot be generalized; in some cases it can reach nearly 300 degrees. The question also mentions that the raw material contains chloride ions, which lead to the formation of ammonium chloride crystals; the sublimation temperature of these crystals is 270 degrees, and since the high-temperature processing temperature must be higher than this value, it is relatively high.
In other words, materials with a high chloride ion content have a too low thermal decomposition temperature of 240.
There is a corresponding relationship between the temperature of the hot high-pressure stream and the temperature of the heating furnace: 1. If the temperature at the inlet of the high-pressure stream is too low, it can lead to crystallization of ammonium chloride salts, which in turn blocks the heat exchanger； 2. An excessively high temperature at the inlet of the heating furnace can result in a small temperature difference between the inlet and outlet of the reaction heating furnace; in the event of a safety accident, this will **reduce the factor for safe handling of such accidents** ； 3. An excessively low temperature at the inlet of the heating furnace leads to a large temperature difference between the inlet and outlet of the reaction heating furnace, increases the amount of fuel gas required by the heating furnace, and raises the energy consumption of the facility ； Therefore, it is necessary to take various factors into account when determining the temperatures at the heating furnace and the hot high-pressure inlet in order to achieve optimal optimization!