• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An exhaust gas after-treatment system (2) for an internal combustion engine, with a particle filter (4) arranged downstream of an internal combustion engine (1) for filtering soot out of the exhaust gas, and with an oxidation catalytic converter (3) arranged upstream of the particle filter (4) and downstream of the internal combustion engine (1) for the oxidation of SO2 into SO3, wherein the SO3 and/or precipitated H2SO4 serves for the oxidation of soot in the particle filter (4) and thus for the regeneration of the particle filter (4).
    公开号:DK201570205A1
    申请号:DK201570205
    申请日:2015-04-08
    公开日:2015-11-02
    发明作者:Andreas Döring
    申请人:Man Diesel & Turbo Se；
    IPC主号:
    专利说明:

    Exhaust gas after-treatment system and method for the exhaust gas after- treatment
    The invention relates to an exhaust gas after-treatment system. The invention, furthermore, relates to a method for the exhaust gas after-treatment.
    From practice, exhaust gas after-treatment systems of internal combustion engines are known, which comprise a particle filter and at least one exhaust gas after-treatment assembly arranged seen in flow direction of the exhaust gas upstream of the particle filter. An exhaust gas after-treatment assembly positioned seen in flow direction of the exhaust gas upstream of the particle filter is in particular an oxidation catalytic converter for the oxidation of nitrogen monoxide (NO) into nitrogen dioxide (NO2). The term particle filter is to mean both conventional particle filters through which the exhaust gas flows, as well as particle filters in which the exhaust gas flow is conducted along a separating structure.
    In particular when seen in flow direction of the exhaust gas flow upstream of the particle filter an oxidation catalytic converter for the oxidation of NO into NO2 is positioned, is NO oxidised into NO2 with the help of the residua! oxygen O2 contained in the exhaust gas flow in the oxidation catalytic converter according to the following equation:
    With this oxidation of nitrogen monoxide into nitrogen dioxide, the equilibrium of the oxidation reaction at high temperatures is on the side of nitrogen monoxide. This results in that the achievable component of nitrogen dioxide is greatly limited at high temperatures.
    In the particle filter, the nitrogen dioxide extracted in the oxygen catalytic converter is converted with carbon-containing particles, so-called soot, collecting in the particle filter into carbon monoxide (CO), carbon dioxide (CO2), nitrogen (N2) and nitrogen monoxide (NO). In the process, a continuous removal of the carbon-containing particulate matter or of the soot accumulated in the particle filter takes place in the sense of a passive regeneration of the particle filter, wherein this conversion takes place according to the following equations:
    In particular when with such passive regeneration of the particle filter no complete conversion of the carbon-containing particulate matter or of the soot embedded in the particle filter can take place, the carbon content or soot content in the particle filter increase, the particle filter then having a tendency towards clogging as a result of which ultimately the exhaust gas backpressure on an internal combustion engine arranged upstream of the exhaust gas after-treatment system increases.
    An increasing exhaust gas backpressure on the internal combustion engine diminishes the power of the internal combustion engine and causes increased fuel consumption.
    In order to avoid an increase of the carbon-containing particulate matter or of the soot in the particle filter and thus dogging of the same it is already known from practice to provide particle filters with a catalytic coating. Platinum-containing coatings are preferentially employed here. The use of such particle filters with catalytic coating however can prevent charging the particle filter with carbon-containing particulate matter, i.e. with soot, only to an insufficient degree.
    Furthermore it is known from practice to employ active regeneration of the particle filter in order to reduce the charging of a particle filter with soot. During such active regeneration of the particle filter, the exhaust gas temperature is actively increased for example by adding fuel to the exhaust gas flow in order to burn off carbon-containing particulate matter or soot particles, which have accumulated in the particle filter, via an exothermic reaction or oxidation of the hydrocarbons. Burning off the carbon with the help of oxygen in a particle filter thus takes place according to the following equation:
    During active regeneration of a particle filter by burning off the soot particles, a major increase in temperature up to 1000 °C can develop in the particle filter. During such a major temperature increase, damage to the particle filter can occur.
    Starting out from this, the present invention is based on the object of creating a new type of exhaust gas after-treatment system and a new type of method for the exhaust gas after-treatment.
    This object is solved through an exhaust gas after-treatment system according to Claim 1. The exhaust gas after-treatment system according to the invention for an internal combustion engine comprises a particle filter arranged downstream of an infernal combustion engine for filtering soot out of the exhaust gas, and an oxidation catalytic converter arranged upstream of the particle filter and downstream of the internal combustion engine for the oxidation of SO2 into SO3, wherein the SO3 and/or precipitated H2SG4 serves for the oxidation of soot in the particle filter and thus for the regeneration of the particle filter.
    The present invention utilises SO3, in internal combustion engines, which combust sulphur-containing fuels, such as for example heavy fuel oil, for the regeneration of a soot particle filter, which SO3 is generated in an oxidation catalytic converter for the oxidation of SO2 into SO3 arranged upstream of the particle filter, in internal combustion engines, such as for example marine diesel engines, which as fuel combust fuel having a relatively high sulphur contents such as for example heavy fuel oil, effective continuous regeneration of a particle filter can thus be provided.
    According to an advantageous further development, a mass ratio between SO3 and soot downstream of the oxidation catalytic converter in the region of the particle filter amounts to at least 7:1, preferably at least 12:1, most preferably at least 16:1. These mass ratios between SO3 and soot allow a particularly effective passive regeneration of the particle filter.
    In the case of an exhaust gas supercharged internal combustion engine, the oxidation catalytic converter is positioned upstream of a turbine of an exhaust gas turbocharger, wherein the particle filter is positioned downstream of the turbine of the exhaust gas turbocharger. Through the relatively high temperatures and pressure which are present upstream of the turbine the oxidation of SO2 into SO3 in the oxidation catalytic converter is favoured.
    According to an advantageous further development, an oxidation catalytic converter for the oxidation of NO into NO2 is arranged upstream of the particle filter and downstream of the internal combustion engine, wherein the NO2 serves for the oxidation of soot in the particle filter and thus the regeneration of the particle filter. During operation of the internal combustion engine with a fuel that has a relatively high sulphur content, the exhaust gas flow can be conducted via the oxidation catalytic converter for the oxidation of SO2 into SO3, whereas in the case of an operation of the internal combustion engine with a fuel that has a relatively low sulphur content, the exhaust gas flow can be conducted by the oxidation catalytic converter for the oxidation of NO into NO2. This configuration is advantageous when internal combustion engines are operated with different types of fuel.
    The method for the exhaust gas after-treatment according to the invention is defined in Claim 9.
    Preferred further developments of the invention are obtained from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail with the help of the drawing without being restricted to this. Here it shows:
    Fig. 1: a block diagram of a first exhaust gas after-treatment system according to the invention;
    Fig. 2: a block diagram of a second exhaust gas after-treatment system according to the invention; and
    Fig. 3: a block diagram of a third exhaust gas after-treatment system according to the invention,
    The present invention relates to an exhaust gas after-treatment system for an internal combustion engine, for example for a stationary internal combustion engine in a power plant or for a non-stationary internal combustion engine which is employed on a ship, which is operated with fuel having a relatively high sulphur content such as for example heavy fuel oil.
    Fig. 1 shows a first exemplary embodiment of an exhaust gas after-treatment system 2 positioned downstream of an internal combustion engine 1, wherein the exhaust gas after-treatment system 2 comprises at least one oxidation catalytic converter 3 for the oxidation of SCh into SO3 and a particle filter 4 arranged downstream of the oxidation catalytic converter 3 for filtering soot out of the exhaust gas of the internal combustion engine 1.
    In the oxidation catalytic converter 3, the SO2 contained in the exhaust gas of the internal combustion engine 1 is oxidised info SO3. wherein the SO3 extracted in the process serves for the oxidation of soot in the particle filter 4 and thus for the regeneration of the particle filter 4.
    The oxidation of SO2 into SO3 in the oxidation catalytic converter 3 takes place according to the following reaction equation:
    The oxidation of the soot in the particle filter 4 with the help of the SO3 formed in the oxidation catalytic converter 3 in this case takes place according to the following reaction equations:
    Should the exhaust gas cool down below the sulphuric acid dew point, precipitation of H2SO4 (sulphuric acid) occurs, wherein H2SO4 can likewise be utilised for the oxidation of soot in the particle filter 4 and thus for the regeneration of the particle filter 4, In the process, sulphuric acid can effectively oxidise soot in particular at exhaust gas temperatures below 250 °C and thus make possible effective regeneration of the particle filter 4.
    The oxidation catalytic converter 3 utilises vanadium V and/or potassium K and/or sodium Na and/or iron Fe and/or cer Ce and/or caesium Cs and/or oxides of these elements as active component for the oxidation of SO2 into SO3, wherein the oxidation catalytic converter 3 utilises titanium oxide Τίθ2 and/or silicon oxide S1O2 preferentially stabilised by tungsten oxide WO3.
    The component of vanadium in the oxidation catalytic converter 3, which is present as active component for the oxidation of SO2 into SO3 amounts to more than 5 %, preferentially more than 7 %, particularly preferably more than 9 %.
    The conversion of SO2 into SO3 in the oxidation catalytic converter 3 is effected in such a manner that downstream of the oxidation catalytic converter 3 in the region of the particle filter 4 there is a mass ratio between SO3 and soot of at least 7:1, preferably of at least 12:1, particularly preferably of at least 16:1.
    Fig, 2 shows a further development of the exhaust gas after-treatment system 2 of Fig. 1, wherein the internal combustion engine of Fig. 2 is an exhaust gas supercharged interna! combustion engine, in which exhaust gas is accordingly expanded in a turbine 5 of an exhaust gas turbocharger in order to extract mechanical energy, which serves for driving a compressor of the exhaust gas turbocharger which is not shown, in order to compress charge air to be fed to the internal combustion engine 1 in the compressor of the exhaust gas turbocharger.
    In particular when, as shown in Fig. 2, the exhaust gas after-treatment system 2 accordingly comprises a turbine 5 of an exhaust gas turbocharger is the oxidation catalytic converter 3 positioned upstream of the turbine 5 and the particle filter 4 downstream of the turbine 5. The high pressures and temperatures upstream of the turbine 5 of an exhaust gas turbocharger favour the oxidation of SO2 into SO3 in the oxidation catalytic converter 3.
    A further advantageous further development of the exhaust gas after-treatment system 2 of Fig. 1 is shown by Fig. 3, wherein the version of Fig. 3 is used in particular in internal combustion engines 1 which are operated both with fuel having a relatively high sulphur content and also with fuel having a relatively low sulphur content.
    Accordingly, Fig, 3 shows an exhaust gas after-treatment system 2 which in turn comprises an oxidation catalytic converter 3 arranged downstream of the internal combustion engine 1 for the oxidation of SO2 into SO3 and a particle filter 4 arranged downstream of said oxidation catalytic converter 3 for filtering soot out of the exhaust gas, wherein however the exhaust gas after-treatment system 2 of Fig. 3 additionally comprises an oxidation catalytic converter 6 for the oxidation of NO into NO2. The NO2 extracted in the oxidation catalytic converter 6 likewise serves for the oxidation of soot in the particle filter 4 and thus the regeneration of the same.
    In Fig. 3, the oxidation catalytic converter 6 for the oxidation of NO into NO2 is connected parallel to the oxidation catalytic converter 3 for the oxidation of SO2 into SO3, wherein the exhaust gas of the internal combustion engine is conducted, dependent on the opening position of shut-valves 7, 8, either via the oxidation catalytic converter 3 or via the oxidation catalytic converter 6.
    In particular when the internal combustion engine 1 is operated with a fuel which has a relatively high sulphur content, the shut-off valves 8 open and the shut-off valves 7 closed, so that the exhaust gas flow of the internal combustion engine 1 is then conducted via the oxidation catalytic converter 3 for the oxidation of SO2 into SO3 and the oxidation catalytic converter 6 for the oxidation of NO into NO2 is separated from the exhaust gas flow. If by contrast the internal combustion engine 1 of Fig, 3 is operated with fuel that has a relatively low sulphur content, the shutoff valves 7 are opened and the shut-off valves 8 closed, so that the exhaust gas is conducted via the oxidation catalytic converter 6 for the oxidation of NO into NO2, wherein the oxidation catalytic converter 3 for the oxidation of SO2 into SO3 is separated or shut off from the exhaust gas flow. The version of Fig. 3 is suitable in particular for use in marine engines, which on the one hand are operated with fuel having a relatively high sulphur content and on the other hand with fuel having a relatively low sulphur content. Here, dependent on the type of fuel used, suitably adapted passive regeneration of the particle filter 4 optionally via NO2 or SO3 can then be ensured.
    In particular when during operation of the internal combustion engine 1 with fuel having a relatively high sulphur content the shut-off valves 7 are dosed is the oxidation catalytic converter 6, which serves for the oxidation of NO into NO2, kept free of sulphur. An alternative to this consists in omitting the shut-off valves and rendering the oxidation catalytic converter 6 operational following operation with fuel having a relatively high sulphur content in that the exhaust gas temperature is raised and sulphur thus desorbed in the oxidation catalytic converter 6, The version with the shut-off valves 7. 8 however is preferred since following operation of the internal combustion engine 1 with sulphur-containing fuel the oxidation catalytic converter 6 is then ready for operation immediately following this.
    In the present context, as indicated in claim 11, when the sulphur content is relatively high, the content of sulphur content in the exhaust gas may preferably be assumed to be 1000 ppm (parts per million) or higher.
    Thus, in particular, the exhaust gas after-treatment system is employed in internal combustion engines which are operated with fuel the sulphur content of which amounts to at least 1000 ppm.
    List of reference numbers 1 Internal combustion engine 2 Exhaust gas after-treatment system 3 Oxidation catalytic converter 4 Particle filter 5 Turbine 6 Oxidation catalytic converter 7 Shut-off valve 8 Shut-off valve
    权利要求:
    Claims (12)
    [1] 1. An exhaust gas after-treatment system (2) for an internal combustion engine, with a particle filter (4) arranged downstream of an internal combustion engine (1) for filtering soot out of the exhaust gas, and with an oxidation catalytic converter (3) arranged upstream of the particle filter (4) and downstream of the internal combustion engine (1) for the oxidation of SO2 into SO3, wherein the SO3 and/or precipitated H2SO4 serves for the oxidation of soot in the particle filter (4) and thus for the regeneration of the particle filter (4).
    [2] 2. The exhaust gas after-treatment system according to Claim 1, characterized in that the oxidation catalytic converter (3) comprises vanadium and/or sodium and/or iron and/or cer and/or caesium and/or oxides of these elements as active component for the oxidation of SO2 into SO3, wherein the oxidation catalytic converter utilises titanium oxide and/or silicon oxide as base material preferentially stabilised by tungsten oxide.
    [3] 3. The exhaust gas after-treatment system according to Claim 1 or 2, characterized in that the oxidation catalytic converter (3) as active component comprises vanadium with a component of more than 5 %, preferably of more than 7 %, particularly preferably more than 9 %.
    [4] 4. The exhaust gas after-treatment system according to any one of the Claims 1 to 3, characterized in that downstream of the oxidation catalytic converter (3) in the region of the particle filter (4) a mass ratio between SO3 and soot amounts to at least 7:1, preferably at least 12:1, particularly preferably at least 16:1.
    [5] 5. The exhaust gas after-treatment system according to any one of the Claims 1 to 4, characterized in that, in an exhaust gas supercharged internal combustion engine, the oxidation catalytic converter (3) is positioned upstream of a turbine (5) of an exhaust gas turbocharger, and wherein the particle filter (4) is positioned downstream of the turbine (5).
    [6] 8. The exhaust gas after-treatment system according to any one of the Claims 1 to 5, characterized ϋη that an oxidation catalytic converter (6) for the oxidation of NO into NO2 is arranged upstream of the particle filter (4) and downstream of the Internal combustion engine (1), wherein the NO2 serves for the oxidation of soot in the particle filter and thus for the regeneration of the particle filter (4).
    [7] 7. The exhaust gas after-treatment system according to Claim 6, characterized in that the oxidation catalytic converter (6) for the oxidation of NO into NO2 is connected parailel to the oxidation catalytic converter (3) for the oxidation of SO2 into SO3.
    [8] 8. The exhaust gas after-treatment system according to Claim 6 or 7, characterized in that the oxidation cataiytic converter (6) for the oxidation of NO into NO2 and/or the oxidation catalytic converter for the oxidation of SO2 into SO3 can be shut off from the exhaust gas flow by shut-off valves (7).
    [9] 9. A method for the exhaust gas after-treatment of exhaust gas leaving an internal combustion engine, wherein the exhaust gas is initially conducted via an oxidation cataiytic converter (3) for the oxidation of SO2 into SO3 and following this via a particle filter (4) for filtering soot out of the exhaust gas, wherein the SO3 formed in the oxidation cataiytic converter and/or precipitated H2SO4 serves for the oxidation of soot in the particle filter (4) and thus for the regeneration of the particle filter (4),
    [10] 10. The method according to Claim 9, characterized in that during operation of the infernal combustion engine with a fuel which has a relatively high sulphur content, the exhaust gas flow is conducted via the oxidation catalytic converter (3) for the oxidation of SO2 into SO3 and an oxidation catalytic converter (6) for the oxidation of NO into NO2 is shut off from the exhaust gas flow by shut-off valves, whereas during operation of the internal combustion engine with a fuel that has a relatively low sulphur content, the exhaust gas flow is conducted via the oxidation catalytic converter (6) for the oxidation of NO into NO2 and the oxidation catalytic converter (3) for the oxidation of SO2 into SO3 is shut off from the exhaust gas flow,
    [11] 11. The method according to Claim 9 or 10, characterized in that the sulphur content of the fuel is above 1000 ppm.
    [12] 12. The method according to Claim 9 or 10, characterized in that the method is carried out with the help of the exhaust gas after-treatment system according to any one of the Claims 1 to 8.
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    法律状态:
    优先权:
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