Process optimization in the first column of the catalytic unit
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In my catalytic unit’s distillation column, the process involves using heat from the reboiler of the stabilizer; this heat is then used to generate steam at 0.8 Mpa through an evaporator. Currently, the company has an excess supply of low-pressure steam, and optimization is needed. Do anyone have any good suggestions?
Consider using a heat source at the bottom of the distillation tower.
Heat exchange with the raw material or using the heat source at the bottom of the distillation column could be considered
The process at No. 1 Middle School is the same as ours; I will explain it by referring to our situation. As a heat source to stabilize the bottom of the tower, if it is also used as a heat source for the desorption tower, there may not be enough heat available ； Our plant used to produce steam at 0.8 Mpa (in reality, it was below 0.6 Mpa), in amounts of 2–3 tons, which was sent to the regenerator’s dilute phase for use after being depressurized to 1.0 Mpa; the steam was then divided into four streams for different purposes. Later, due to the low volume and unstable supply of steam produced, we switched to using an oxygen remover instead. Eventually, because there wasn’t enough heat at intermediate stages, we removed the steam generator – as using a bypass in winter posed a problem related to preventing freezing of the main pipeline ； Low-pressure steam (1.0 Mpa) is generated by converting medium-pressure superheated steam (3.5 Mpa) using devices such as turbines, steam pumps, and temperature-reducing pressure regulators. It is necessary to conduct proper calculations and planning regarding the excess low-pressure steam available; since we have an excess of medium-pressure steam, the temperature-reducing pressure regulators are set to a level that prevents freezing, to be used in emergency situations. The remaining medium-pressure steam is used to power two generators (with the possibility of adjusting the amount of steam utilized). For low-pressure steam, the key consideration is finding suitable places for heat exchange – especially in summer, after the heating systems are turned off, it is important to determine how much steam is available and where it can be used. This steam is used for heat exchange with fresh water to provide hot water for bathing and heating in winter (the resulting condensate water is mixed into the hot water; we have experienced issues caused by oil in the steam). Additionally, for the heat source at the bottom of the desorption tower, I assume you are also using low-pressure steam. In our case, the heat exchanger experiences minor leaks after each of the 3 cycles of use – oil from the bottom of the tower seeps into the condensate system – and no effective solution has been found for this issue.
For low-temperature heat sources, combined utilization of the equipment needs to be considered; in the situation you described, it’s likely that there is no other place within the equipment where this heat can be utilized
If it goes into the distillation tower, there’s likely not enough heat; the existing steam reboiler will need to be kept
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Our system first provides heat to stabilize the bottom layer, then heats the hot water, and finally returns it to the tower.
Heat exchange using the furnace blower to increase the temperature at the blower outlet