Large pressure difference between methane-rich gas and the main board heat exchanger
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The methane-rich gas enters the main heat exchanger at a temperature of 25°C and a pressure of 1.5 MPa; the carbon dioxide level is less than 1.0 PPM, and the dew point is -100°C. The temperature of the gas exiting the main heat exchanger is -162°C. Pressure difference gauges are installed at both the inlet and outlet. We have four sets of parallel heat exchanger fins, with pressure differences of 35, 38, 36, and 44 KPa respectively, which results in varying gas flow rates across each set of fins. The levels of carbon dioxide and the dew point are within acceptable limits. Apart from these two factors, what other components could cause blockages in the channels and an increase in pressure difference? Thank you
Which ones specifically? Where was it generated?
The heavy hydrocarbon content is too high; we often experience blockages here. Under deep cold conditions, heavy hydrocarbons turn into white crystals, and when their amount is high, they become paste-like in texture.
High levels of heavy hydrocarbons can also cause blockages, as well as isopentane, neopentane, etc
Basically, it has a high content of heavy hydrocarbons. To reduce the risk of blockages, one can either use external discharge methods before the cold box or in its pre-cooling section, or add an ice maker before the cold box. In either case, the principle of heat exchange is utilized to cool the gaseous heavy hydrocarbon components into a liquid state, which can then be discharged.