Method for purifying and separating methane from oxygen-containing coal-bed gas
A technology for separating methane and coalbed methane, which is used in distillation purification/separation, hydrocarbon purification/separation, chemical instruments and methods, etc. It can solve the problems of insufficient technical maturity, poor technical economy, and high cost of deep deoxygenation
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Embodiment 1
[0072] An oxygen-containing coalbed methane mixture, the oxygen-containing coalbed methane first enters the refrigeration system of the device 1 to cool down, then enters the rectification tower 2 to be separated into tail gas and liquid pure methane, and flows out from the tail gas outlet point 2' at the top of the rectification tower Tail gas, liquid pure methane flows out from the bottom of the rectification tower.
[0073] First determine the most explosive position in the separation system. The most explosive position is determined by the known temperature and pressure distribution of each tray of the rectification column under normal operating conditions, as well as the liquid and gas in each tray. concentration and calculated by formula (3) and formula (4) to obtain the critical explosion point on each tray, comparing the critical explosion point of each tray, the position in the separation system corresponding to the lowest critical explosion point is the easiest The l...
Embodiment 2
[0080] An oxygen-containing coalbed methane mixture, the oxygen-containing coalbed methane first enters the refrigeration system of the device 1 to cool down, then enters the rectification tower 2 to be separated into tail gas and liquid pure methane, and flows out from the tail gas outlet point 2' at the top of the rectification tower Tail gas, the tail gas enters the cooling capacity recovery system of the device 1 to recover cooling capacity. In this embodiment, both the refrigeration system and the cooling capacity recovery system are in the equipment 1, and liquid pure methane flows out from the bottom of the rectification tower.
[0081] First determine the most explosive position in the separation system. The most explosive position is determined by the known temperature and pressure distribution of each tray of the rectification column under normal operating conditions, as well as the liquid and gas in each tray. concentration and calculated by formula (3) and formula (...
Embodiment 3
[0087]An oxygen-containing coalbed methane mixture, the oxygen-containing coalbed gas first enters the refrigeration system of the device 1 to cool down, then enters the rectification system 2 to be separated into tail gas and liquid pure methane, and flows out from the tail gas outlet point 2' at the top of the rectification system Tail gas, liquid pure methane flows out from the bottom of the rectification system.
[0088] The calculation process is as follows:
[0089] See Example 2 for the establishment of the oxygen-containing coalbed methane coordinate area.
[0090] See Example 2 for the establishment method of the explosion triangle in the initial state of oxygen-containing coalbed methane. The initial concentrations of methane, oxygen and nitrogen in the feed gas mixture of oxygen-containing coalbed methane are 8%, 5% and 87% respectively, and the initial state of the tail gas outlet is For normal temperature and pressure.
[0091] First, according to the initial co...
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