Method for purifying and separating methane from oxygen-containing coal bed gas

Method for purifying and separating methane from oxygen-containing coal bed gas

CN
  • CN 101,531,559 B
  • Filed: 03/13/2008
  • Issued: 11/21/2012
  • Est. Priority Date: 03/13/2008
  • Status: Active Grant
First Claim
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1. the method for a purifying and separating methane from coalbed methane containing oxygen;

  • Said method comprising the steps of;

    at first the virgin gas of coalbed methane containing oxygen is lowered the temperature, then the coalbed methane containing oxygen after the cooling is carried out rectification process, promptly get the methane of purifying through separating;

    It is characterized in thatA) the original volume concentration y of the methane in the detection virgin gas 0B) the volumetric concentration Y with methane is an X-coordinate, and the volumetric concentration X of oxygen is an ordinate zou, be used for setting up coordinates regional to the coalbed methane containing oxygen of separation process scheme, and definite coalbed methane containing oxygen explosion triangle in the respective coordinates zone under original state;

    C) work as y 0When being positioned at the oxygen debt district of coordinates regional of coalbed methane containing oxygen of this position, remove the oxygen in the virgin gas to be lowered the temperature, and make the amount of removing of oxygen satisfy below relation;

    X&

    GreaterEqual;

    [yO20(100-yc)-yO2c(100-y0)]/[yO20(100-yc)-yO20yO2c],
    Wherein, X is the oxygen that removes and the mol ratio of virgin gas, Be the original volume concentration of oxygen in the virgin gas, y cBe the methane volumetric concentration of the critical detonation point in the easiest respective coordinates zone, position of blasting in the separation process scheme, It is the carrier of oxygen volume concentrations of the critical detonation point in the easiest respective coordinates zone, position of blasting in the separation process scheme;

    D) keep the volumetric concentration of methane, separation of methane from virgin gas;

    Wherein, the coordinates regional of described coalbed methane containing oxygen is set up through following method;

    A) the intersection point O (0,0) with the coordinate transverse axis and the coordinate longitudinal axis confirms as true origin, and the volumetric concentration of methane is 100%, and the oxysome volume concentrations is that 0 point is confirmed as the B point, and the volumetric concentration of oxygen is 100%, and the volumetric concentration of methane is that 0 point is confirmed as A;

    B) tie point A, O, B form the coordinates regional of the coalbed methane containing oxygen in the separation process scheme;

    Described coalbed methane containing oxygen corresponding explosion triangle under original state is set up through following method;

    A) methane and the straight-line equation of Air mixing gas in rectification process With the intersection point of the coordinate longitudinal axis be A 1, tie point A 1, B forms methane and Air mixing gas straight-line equation A 1B, The volumetric concentration of expression oxygen, Y representes the volumetric concentration of methane;

    B) Lower Explosive Limit point L, upper explosive limit point V and the critical explosion ratio point N with methane under the normal temperature and pressure and Air mixing gas is connected;

    The explosion triangle LVN that forms coalbed methane containing oxygen under the normal temperature and pressure;

    LN is the Lower Explosive Limit line of coalbed methane containing oxygen under the normal temperature and pressure, and VN is the upper explosive limit line of coalbed methane containing oxygen under the normal temperature and pressure;

    C) through under non-normal temperature and pressure, the Lower Explosive Limit point L of coalbed methane containing oxygen under initial shape 1, upper explosive limit point V 1Make the parallel lines of LN and VN respectively, two parallel lines intersect at N 0Point, then trilateral L 1V 1N 0Be the explosion triangle of the coalbed methane containing oxygen under original state, L 1N 0Be the Lower Explosive Limit line of the coalbed methane containing oxygen under original state, V 1N 0Upper explosive limit line for the coalbed methane containing oxygen under original state;

    D) with N 0L 1Prolong with AB and intersect at L 0, with N 0V 1Prolong with AB and intersect at V 0, tie point L 0, V 0And N 0, obtain the explosion triangle L of coalbed methane containing oxygen in coordinates regional 0V 0N 0The position that in described separation process scheme, is prone to most blast is the position near the distillation system outlet, and the critical detonation point in the described separation process scheme in the easiest respective coordinates zone, position of blasting obtains through following method;

    A) methane and the straight-line equation of Air mixing gas in rectification process With the intersection point of the coordinate longitudinal axis be A 1, tie point A 1, B forms methane and Air mixing gas straight-line equation A 1B, The volumetric concentration of expression oxygen, Y representes the volumetric concentration of methane;

    B) Lower Explosive Limit point L, upper explosive limit point V and the critical explosion ratio point N with methane under the normal temperature and pressure and Air mixing gas is connected;

    The explosion triangle LVN that forms coalbed methane containing oxygen under the normal temperature and pressure;

    LN is the Lower Explosive Limit line of coalbed methane containing oxygen under the normal temperature and pressure, and VN is the upper explosive limit line of coalbed methane containing oxygen under the normal temperature and pressure;

    C) through under non-normal temperature and pressure, the Lower Explosive Limit point L of methane and Air mixing gas under the temperature and pressure of the easiest position of blasting in the separation process scheme 2, upper explosive limit point V 2Make the parallel lines of LN and VN respectively, two parallel lines intersect at N 0'"'"' point, this point is the critical detonation point in the easiest respective coordinates zone, position of blasting in the separation process scheme.

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