Why is the water coming out of the purification tower in the methanol-to-hydrogen plant contaminated with oil?
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Why is the water coming out of the purification tower in the methanol-to-hydrogen plant contaminated with oil? There is a layer of oil floating on the surface of the demineralized water tank after returning from the purification tower; it seems that this oil must have been present since the output of the converter. All possible causes have been investigated, and the possibilities of heat transfer oil leakage, oil in the pumps, or oil in the raw materials have been ruled out. Is it possible for oil to be generated during the methanol-to-hydrogen conversion process? The exit temperature of the converter is 270 degrees Celsius, with a pressure of 1.3 MPa. Please help analyze this situation
The desalinated water enters the purification tower to wash out methanol from the converted gas, and the liquid at the bottom of the tower then returns to the outlet of the methanol pump, where it passes through a vaporizer and a superheater – is this the process? The oil that comes out of the purification tower isn’t necessarily from the conversion process; it could also originate from the demineralized water. Take another oil sample for testing, such as density, final boiling point, viscosity, and so on. By taking samples at each stage, it is possible to determine which stage starts to carry oil
The process is more or less the same: after being washed with demineralized water, the fluid goes into a demineralized water buffer tank. I’ve checked everything you mentioned; in the case of oil, the initial boiling point has not been reached even at 200°C. With a density of over 0.8, no oil contamination was detected in the raw water, methanol, heaters, etc
The exhaust system doesn’t have a compressor; it simply creates a vacuum to expel the air
I think pump leakage has been ruled out, so the problem is likely related to the heat transfer oil. Its density is over 0.8, and its initial boiling point is above 200 degrees; since lubricating oil has been excluded, it must be the heat transfer oil. You mentioned earlier that thermal oil, pumps, and raw materials have been ruled out; the system does not produce oil. Please check again in detail how thermal oil comes into contact with the process gas – the vaporizer, superheater, converter
The key question is where the oil comes from. Ours also contains oil; at first glance it seems to be heat transfer oil, but the pressure of heat transfer oil is much lower than that of the conversion gas – so how does it get in?
The cause has been identified; the problem lies in the methanol raw material, and it is due to the fact that some vehicles do not have dedicated use. Now that the issue has been controlled, there isn’t any more fuel left