I would like to ask fellow sailors: how is the gas regulated in your factory?
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The gas produced in our plant mainly comes from several units such as catalytic cracking, atmospheric and vacuum distillation, and heavy oil hydrogenation; it is consumed by various heating furnaces. Under normal circumstances, there is an excess of gas production, which can also be supplied to gas companies. However, recently due to fluctuations in the FCC units, the pressure in the gas pipeline network has been fluctuating frequently, which in turn causes fluctuations in the heating furnaces of various units. Our plant has two vaporizers that can be used to supply liquefied gas, but on the one hand, adding liquefied gas leads to fluctuations in the calorific value of the gas; on the other hand, it’s often too late to add liquefied gas once the pressure starts to drop (compared to the temperature of the heating furnace). I would like to ask fellow professionals: how does your plant balance the gas supply? What adjustment methods do you use? How can fluctuations (both in pressure and calorific value) be kept to a minimum?
It is mainly burned as fuel. Our dry gas system has two control valves, A and B; valve A is used for regulating the system pressure, with a specific pressure level set. When the pressure exceeds this level, valve B opens, allowing the excess dry gas to flow into the flare system!
It is best to use an upper gas holder device for gas pressure regulation, as it can effectively control the system pressure of the gas.
We only have one set of atmospheric and vacuum distillation units; we just send it to the heating furnace for combustion
The fuel gas from our unit is used for combustion in the furnace; any excess of it is sent to the flare, so our control mechanism simply involves opening and closing the valve that controls the flow to the flare.
It seems that everyone else has an ample supply of fuel gas, but our company is facing a shortage at the moment; it doesn’t seem like there’s any good solution. We also have gas cylinders equipped with two compressors. At present, the amount of dry gas recovered is relatively small; when one compressor is turned on, the liquid level in the gas cylinders drops, and once it runs out, operation must be stopped. Once operation stops, the pressure in the pipeline network decreases. . . .