Technology for preparing liquefied natural gas and liquid ammonia by using coke oven gas

Technology for preparing liquefied natural gas and liquid ammonia by using coke oven gas

  • CN 102,517,108 A
  • Filed: 12/15/2011
  • Published: 06/27/2012
  • Est. Priority Date: 12/15/2011
  • Status: Active Application
First Claim
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1. technology of utilizing coke(oven)gas preparing liquefied natural gas coproduction liquefied ammonia is characterized in that may further comprise the steps:

  • (1) compression section;

    coke(oven)gas is compressed to 0.5 ~ 5.5Mpa;

    (2) coke(oven)gas purifies;

    remove impurity such as coke(oven)gas is coal-tar middle oil, naphthalene, ammonia, sulphur;

    (3) coke-oven gas methanation;

    adopt 2 ~ 5 grades of methanation reactions, obtaining with methane is main high methane gas, outlet CO 2Less than 50ppm;

    (4) synthetic natural gas low temperature separation process liquefaction;

    get into low temperature separation process liquefaction operation after the high methane gas cooled dehydrated that step (3) obtains, adopt the low temperature separation process liquefaction process of band rectifying, obtain LNG at the tower still of fractionate, the yield of LNG is 96 ~ 99%;

    Cat head obtains hydrogen, nitrogen and contains the hydrogen-rich gas of a small amount of methane, and hydrogen-rich gas gets into transformation fractionation by adsorption operation after reclaiming cold;

    (5) transformation fractionation by adsorption operation and hydrogen rich gas system liquefied ammonia;

    hydrogen-rich gas separates hydrogen, nitrogen and methane in the transformation adsorption separation device, obtains hydrogen, nitrogen and methane respectively, mixes the back then nitrogen pressure and with hydrogen according to f=n H2;

    n N2=2.95 ~ 3.05;

    1 proportioning hydrogen and nitrogen get into the ammonia synthesis operation;

    Replenish the nitrogen of part purity in 99.995%~

    99.999% scope;

    Nitrogen source employing deep cooling low ternperature separation process technology or PSA nitrogen producing craft and the non-low ternperature separation process technology of film separation and nitrogen-making technology are carried out air separation, are forced into 12.0~

    32.0MPa after hydrogen that satisfies condition and nitrogen mix and get into ammonia synthesis converter production liquefied ammonia.

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