The method carrying out the hydrogenation methanation of carbon raw material

The method carrying out the hydrogenation methanation of carbon raw material

  • CN 102,459,525 B
  • Filed: 05/12/2010
  • Issued: 09/21/2016
  • Est. Priority Date: 05/13/2009
  • Status: Active Grant
First Claim
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1. one kind produces multiple gases product from carbon raw material and produces the side of methane product streamMethod, the method comprises the following steps:

  • (a) by carbon raw material, hydrogenation methanation catalyst, water vapor stream, the first gas raw material stream,And optionally, the first oxygen-enriched stream is supplied to be hydrogenated with methanator;

    (b) in the presence of carbon monoxide, hydrogen, water vapour and hydrogenation methanation catalyst, extremelyAt a temperature of few 700 (371 DEG C)-1500 (816 DEG C), make described carbon raw material in instituteState hydrogenation methanator in react, with produce comprise methane, carbon monoxide, hydrogen,Carbon dioxide and the initial product stream rich in methane of heat energy;

    C () extracts the described product stream rich in methane from described hydrogenation methanator out, whereinThe described initial product stream rich in methane comprises based on described rich in the initial product stream of methaneThe methane and two of at least 50 moles of % of molal quantity of methane, carbon dioxide, carbon monoxide and hydrogenCarbonoxide;

    D the described initial product conductance rich in methane is entered heat exchanger by (), to reclaim heat energy and to produceThe cooled initial product stream rich in methane;

    E () utilizes the heat energy reclaimed in step (d) next (1) adding described in being imported by described water vapor streamMake it overheated before hydrogen methanator, and (2) produce the first process steam stream;

    (f) hydrogen in the described cooled initial product stream rich in methane and carbon monoxideMol ratio is less than in the case of 3;

    1, optionally to the described cooled initial product rich in methaneA part of carbon monoxide in logistics carries out acid conversion, to produce heat energy and hydrogen and an oxidationThe mol ratio of carbon is the treated product stream rich in hydrogen of at least 3;

    1;

    G () optionally reclaims by heat energy produced by step (f), if any, at least a part of which onePartially recycled heat energy is used to the second process steam stream;

    H () optionally, makes described cooled rich at the beginning of methane in catalytic production of methane reactorBeginning product stream or if there is the treated product stream rich in hydrogen in a part of hydrogenReact in the presence of catalyst for methanation in presence of sulfur with at least some of carbon monoxide, to produceTreated product stream rich in methane;

    I () optionally reclaims by heat energy produced by step (h), if any, wherein utilize toThe heat energy that a few part reclaims produces the 3rd process steam stream;

    (j) from the described cooled initial product stream rich in methane, or from if there is instituteState the treated product stream rich in hydrogen, or from if there is described in rich in the warp of methaneThe product stream processed is removed major part carbon dioxide and major part hydrogen sulfide, thus from described warpCooling the initial product stream rich in methane, or if there is described in rich in hydrogen through placeThe product stream of reason, or if there is described in rich in the treated product stream of methane, produceComprise the desulfurization air-flow of most hydrogen, carbon monoxide and methane;

    K described sweet gas flow separation is become circulating current and desulfurization product air-flow by ();

    L described circulating current and the second oxygen-enriched stream are supplied to partial oxidation reactor by ();

    M () makes described circulating current and oxygen reaction to produce in described partial oxidation reactorHeat energy and described first gas raw material stream, wherein said first gas raw material stream comprises an oxidationCarbon, hydrogen and water vapour;

    N () optionally, isolates a part of hydrogen from described desulfurization product air-flow, to produce bagThe desulfurization product air-flow that hydrogen containing methane, hydrogen and carbon monoxide reduces;

    (o) in catalytic production of methane reactor, if make to be present in described desulfurization product air-flow orCarbon monoxide in the desulfurization product air-flow that the hydrogen existed reduces and hydrogen are at methanation catalystUnder react, to produce heat energy and the desulfurization product air-flow rich in methane;

    P () reclaims by heat energy produced by step (o), wherein utilize at least some of heat energy reclaimedProduce the 4th process steam stream;

    AndQ () is recycled at least part of described desulfurization product air-flow rich in methane, as described firstAlkane product stream,Wherein;

    Reaction in step (b) has water vapour demand, synthesis gas demand and heat demand amount,Described carbon raw material comprises moisture,Described first oxygen-enriched stream, if any, optionally comprise water vapour,Described water vapour demand is substantially by containing in described steam stream, described flow of feed gasMoisture in water vapour, described carbon raw material and if any, described first oxygen rich airWater vapour in stream meets,Described water vapor stream is substantially by described first process steam stream, described 4th techniqueWater vapor stream, described second process steam stream when it is present and when it is present the described 3rdBeing formed at least partially of one or more in process steam stream,Carbon monoxide and the amount of hydrogen in described first gas raw material stream are sufficient in step (b)The synthesis gas demand of reaction, andDescribed water vapor stream and described flow of feed gas comprise heat energy, and described heat energy combines and be enough toSubstantially meet the heat demand amount of reaction in step (b).

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