• 专利附录
  • 专利说明
  • 权利要求
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  • 优先权
    • 专利摘要:
    In a method and apparatus for producing synthesis gas from carbonaceous waste materials, the carbonaceous waste materials are fed to a reaction chamber (5) in which the waste materials, optionally with external energy supply, are subjected to pyrolysis at temperatures of 600-1,300 ° C., the Resulting synthesis gas and the solid residues from the reaction chamber (5) are discharged. Thereafter, the solid residues and / or the synthesis gas for further decomposition or decomposition are exposed to a plasma.
    公开号:AT516178A4
    申请号:T707/2014
    申请日:2014-09-16
    公开日:2016-03-15
    发明作者:Markus Primavesi；Paul Primavesi；Jean Jacques Weiland；Pierre Holzschuh；Faker Leviev；Johannes Stari
    申请人:Ame Handelsgesellschaft M B H；
    IPC主号:
    专利说明:

    The invention relates to a process and a device for producing synthesis gas from carbonaceous waste materials, in which the carbonaceous waste materials are fed to a reaction chamber in which the waste materials, optionally under external energy supply, are subjected to pyrolysis at temperatures of 600-1300 ° C, the resulting synthesis gas and the solid residues are discharged from the reaction chamber.
    Processes for the pyrolytic treatment of biomass and industrial waste for the production of synthesis gas have already been proposed in various forms. By not carrying out combustion, but pyrolysis in anoxic conditions, such processes ensure that the resulting gas has as low a proportion of CO2 as possible. The resulting in such processes pyrolysis or. Synthesis gases can be burned after discharge, in particular used as engine gas in a gas engine, used as synthesis gases for the chemical industry or in the metal-producing industry, liquefied, used for gas turbines or as natural gas substitution. In the case of natural gas substitution, the synthesis gas consists mainly of CH4.
    Under anoxic conditions, conditions are understood here in which free oxygen is not added. Thus, anoxic conditions are characterized by the fact that hot air or oxygen does not reach the reactor in which the gasification is performed. By contrast, oxygen compounds such as steam or CO2 can of course be reacted in such gasification processes, in which case CO 2 in the presence of carbon at high temperatures, the equilibrium equilibrium is on the side of carbon monoxide and at the inlets of water on the side of synthesis gas, namely carbon monoxide and hydrogen.
    The present invention includes both autothermal high temperature gasification processes in which pyrolysis is independent of external heat input because the glowing waste materials provide the energy for gasification, as well as allothermal gasification processes which require external energy input. A disadvantage of autothermal gasification processes is that high demands are placed on the heat value of the waste materials used. The invention is based on a pyrolysis process in which the thermal decomposition of the feedstock takes place at temperatures of 600-1,300 ° C. Such temperatures are present in allothermal gasification processes by increasing the cost of primary energy sources in the reaction chamber or by external heat input, such as, e.g. achievable by electrical heating of the reaction chamber.
    As feedstock for gasification processes, biomass and various carbonaceous waste materials, e.g. contaminated soils, sewage sludge, cellulose slurries, filter residues and the like., Proposed.
    Depending on the feedstock, the synthesis gas may still contain undesirable substances in conventional gasification processes, e.g. toxic substances (for example tars,
    Dioxins, furans) and / or minerals.
    Another disadvantage of conventional gasification processes is that the solid residues usually still contain carbon, which was not reacted.
    The present invention therefore aims to further develop a method and a device of the type mentioned in the introduction, in that the above-mentioned disadvantages can be at least partially avoided.
    In order to achieve this object, the invention provides in a method of the type mentioned at the outset that the solid residues and / or the synthesis gas are exposed to a plasma for further decomposition or decomposition. By using a plasma, the residual carbon contained in the solid residues can be converted to CO, so that the calorific value of the obtained synthesis gas can be increased. Furthermore, the mineral constituents possibly contained in the synthesis gas can be glazed and discharged as slag. In the slag possibly existing heavy metals and other substances such. Sulfur are bound. Finally, by using plasma, it is possible to crack the undesired substances contained in the synthesis gas, so that a synthesis gas released from pollutants can be made available.
    Although the use of plasma for the thermal decomposition of waste materials is basically already known, it is hardly used in practice because its production is energy-intensive and because the material throughput which can be achieved is very low. By now having two-stage gasification, namely, conventional pyrolytic decomposition at temperatures of 600-1,300 ° C in a first stage and plasma thermal decomposition at substantially higher temperatures in a second stage compared to the first stage, the benefit of the particular gasification process can be achieved at each stage be used optimally. In the first stage, the advantage of the high throughput of the thermal decomposition process is utilized, so that in the second stage only a small amount of decomposition work has to be done. In the second stage, in turn, the advantage is taken that the residual carbon of the solid constituents can be converted by the plasma process and the undesired substances can be removed from the synthesis gas, the disadvantage of the low throughput no longer being significant.
    As already mentioned, within the scope of the plasma gasification provided in the second stage, temperatures are significantly higher than in the first stage. The procedure is preferably such that the solid residues and, if appropriate, the synthesis gas in the reaction zone of the plasma are brought to at least 1,500 ° C., preferably at least 2,400 ° C., preferably at least 4,000 ° C. In the reaction zone, temperatures of up to 15,000 ° C can prevail. The organic components of the residues remaining from the first stage, in particular the residual carbon, are thereby completely converted, and mineral and metallic constituents of the residues remaining from the first stage sinter into a glassy ash.
    The plasma is preferably generated by application of electrostatic fields. In particular, in this case the procedure is such that a sufficiently high electrical DC voltage is applied between two electrodes, with a suitable combination of voltage, electrode spacing and gas pressure causing a flashover and the initiation of a discharge between the electrodes. A gas is flowed through between the electrodes, leading to a plasma is ionized. Upon impact of the plasma on the starting materials, recombination of the deionized atoms occurs, resulting in a substantial increase in temperature, whereby even inert compounds receive the activation energy necessary for complete reaction.
    Air, O 2, H 2 O, CO 2 or the like can be used as plasma gas in this case.
    Particularly preferred is the use of a plasma aspirator suitable for making a cantilever plasma. Such a plasma injector is distinguished by the fact that it manages without a counterelectrode. Reference is made, for example, to AT 507629 A1.
    In the first stage, the thermal decomposition of the waste materials in the reaction chamber preferably takes place such that the reaction chamber comprises a first section and a second section connected thereto, the waste materials passing through the first section under anoxic conditions where they are pyrolyzed, thereafter placed in the second section and in the second section is substoichiometrically introduced oxygen, water vapor and / or CO 2, to ensure a conversion of the residual carbon to CO or CH4. The actual pyrolysis, i. the thermal decomposition below
    Oxygen termination, thus takes place only in the said first section, whereas in the second section a substoichiometric oxygen, CO2 and / or water vapor introduction takes place. In the first section, pyrolysis causes a splitting of the water content in the waste into O2 and H2. The O 2 fraction reacts with some of the carbon contained in the wastes to CO. In the second section, the sub-stoichiometric blowing of O 2 causes a conversion of residual carbon remaining in the wastes into CO. If, alternatively or additionally, hot steam is injected, the residual carbon is converted to CO and CH4. When CO2 is injected, it is split into CO and O, with the free oxygen oxidizing to CO with the residual carbon of the waste (CO2 + C -> 2C0).
    The introduction of the energy required for the thermal decomposition of the waste materials preferably takes place in that the reaction chamber comprises a heatable conveying device, in particular a screw conveyor, with which the waste materials are transported in the reaction chamber, in particular through the latter. The conveyor is thus responsible for both the transport of the input materials and for the heat input.
    A particularly preferred embodiment provides that the first section and possibly the second section of the reaction chambers of the heated conveyor, in particular the screw conveyor, is formed. In the case of a screw conveyor, the reaction space is in the form of a cylinder, the cylinder being in the axial direction
    Direction is penetrated by the screw conveyor. The screw conveyor ensures continuous transport and at the same time constant circulation of the feedstock. When the auger itself is heated, it also causes the permanent renewal of the material in contact with the heated surface.
    Advantageously, it is provided that the conveyor is electrically heated, in particular inductive, conductive or capacitive. With such heating, the atmosphere in the first section of the reaction chamber can be reliably anoxic.
    The heating of the conveyor need not extend over the entire length of the conveyor, but may also concern only a portion. In particular, the heating may be limited to the first section of the reaction chamber in which the pyrolysis is carried out. In the following second section may be waived due to the possibly expiring exothermic oxidation reactions to heating.
    Particularly advantageous is the inductive heating of the conveyor, because this way a contactless energy transfer succeeds in a simple manner. Inductive heating is advantageous not only in the case of a screw conveyor but also in otherwise constructed metallic entrainment conveyors, because the energy can be applied directly to those elements of the conveyor that are in contact with the feed so that efficient heat transfer can occur.
    The contactless heat input can also be realized independently of the conveyor. Thus, for example, it is conceivable that in the reaction chamber an inductively heated bed is arranged from inductive coupling-stimulable elements, in particular steel balls. The inductive heating by lumped elements, such as steel balls, which couple to an induction field applied to the outside of the reaction chamber ensures a particularly uniform heat input into the entire cross-section of the reaction chamber.
    The process is preferably carried out so that the waste materials in the first section of the reaction chambers are heated to a temperature of 500-1,000 ° C.
    In the second section of the reaction chambers, the waste materials are preferably brought to a higher temperature than the first section, in particular to a temperature of 800 to 1200 ° C.
    If necessary or desirable, the invention may be conducted by burning a portion of the synthesis gas produced to achieve the gasification temperature in the reaction chamber. This may increase the temperature in the reaction chambers.
    The object of the invention is also to provide an apparatus for producing synthesis gas from carbonaceous waste comprising a heatable reaction chamber for subjecting the carbonaceous waste to pyrolysis under external energy supply, with at least one discharge opening to the reactor
    Discharging the resulting synthesis gas and the solid residues, characterized in that the at least one discharge opening is connected to a plasma reactor in which the solid residues and / or the synthesis gas can be subjected to a plasma for further decomposition or decomposition. The device is particularly suitable for carrying out the method according to the invention.
    The fact that the reaction chamber is connected to the plasma reactor via an exhaust port does not necessarily mean that the plasma reactor is physically separate from, or separate from, the reaction chamber. It is also conceivable that the plasma reactor is formed in a separate section of the reaction chamber.
    A preferred embodiment provides that the reaction chamber comprises a heatable conveying device, in particular a screw conveyor, with which the waste materials in the reaction chamber, in particular by, are transportable.
    A further preferred embodiment provides that the reaction chamber comprises a first section and a second section connected thereto, wherein the first section forms a pyrolysis chamber and in the second section opens at least one line for introducing oxygen and / or water vapor.
    In this case, the first section and possibly the second section of the reaction chambers may be formed by the heatable conveyor, in particular a screw conveyor. In particular, the second section immediately adjoins the first section of the reaction chamber.
    Advantageously, the conveyor has an electrical heating, in particular for inductive, conductive or capacitive heating of the conveyor.
    With the present invention, it is possible to energetically recycle even highly contaminated waste. In particular, the invention is useful in the valorization of biomass, waste plastics, waste from the paper industry (cellulose sludge), sewage sludge, hospital waste, pharmaceutical industry waste, pharmacy waste, contaminated railway sleepers, waste from the oil / gas industry and the like.
    The invention will be explained in more detail below with reference to exemplary embodiments illustrated diagrammatically in the drawing. 1 shows a first embodiment of the device according to the invention, FIG. 2 shows a modified embodiment and FIG. 3 shows a further modified embodiment of the device.
    FIG. 1 shows a cylindrical reactor 1 with a funnel-shaped material feed 2. The cylindrical wall of the reactor 1, together with a feed screw 3 arranged coaxially to the wall, forms a screw conveyor which transports the material introduced via the material feed 2 through the reaction chamber 5 in the direction of the arrow 4. A coil 6 connectable to a power source surrounds the reactor jacket and forms an inductive heater for the screw conveyor 3. The screw conveyor is therefore made of a stimulable for inductive coupling
    Material, in particular steel, formed. The reactor shell, on the other hand, is not made of an inductive coupling excitable material.
    In a first section 7 of the reactor 1, the reaction chambers 5 are substantially air-tight to the environment. In an immediately following second section 8 of the reactor 1, a feed line 9 opens in the interior of the reactor 1, via which reaction gases, such as air, O 2, CO 2 and / or H 2 O can be introduced. In this case, the screw conveyor 3 extends through both the first section 7 and the second section 8 of the reactor 1. In the end region of the reactor 1 opposite the material feed 2, a discharge line 10 opens in the bottom, via which the reaction products are discharged from the reactor 1 and introduced into a plasma reactor 11. In the interior of the plasma reactor 11 there is arranged a conveyor screw 12 with which the material coming via the discharge line 10 is fed to a plasma injector 13. In the area of the reaction zone of the plasma injector 13, an upward-going synthesis gas outlet 14 and in the bottom an ash / slag discharge 15 are provided.
    Simplified, the gasification in the reactor 1 is in the presence of the water vapor contained in the abandoned wastes according to the equation CHxOy + (I-y) H 2 O- > CO + (l + x / 2-y) H2 and in the presence of carbon dioxide gas according to the equation CHx Oy + (I-y) CO 2 - > (2-y) CO + (x / 2) H2. However, these equations are a rough simplification of the actual prevailing conditions, with particular emphasis on the following reactions: The vapor gasification according to the equation C + H20 = CO + H2 is naturally superimposed from the Boudouard equilibrium according to Equation 2 CO = C + C02 and side reactions in which, for example, methane is formed from carbon according to the equation C + 2¾ = CH4. A
    Reforming reaction proceeds according to the equation CH4 + H20 = CO + 3H2, where finally a shift of the C0 / C02 equilibrium can also be achieved with water vapor, for which the following equation CO + H20 = C02 + H2 is characteristic. At temperatures below 550 ° C, graphite, methane, CO 2 and H 2 O are thermodynamically stable. Only at much higher temperatures can a substantially uniform phase of H2 and CO be achieved. Temperatures of 900-1,000 ° C and above, especially up to 1,300 ° C, are preferred.
    In order to minimize the energy requirement for the gasification taking place in the reactor 1, the temperature in the reactor 1 may preferably be limited to about 1000 ° C, with higher temperatures (> 1500 ° C) being set only in the subsequent plasma reactor 11. The higher temperatures increase the rate of conversion and allow the thermal decomposition of any undesirable substances present in the feedstock, e.g. tarry compounds and toxic substances, which is ensured only in this temperature range.
    In Fig. 2 a modified embodiment is shown with respect to Fig. 1, wherein the same reference numerals are used for the same or corresponding parts as in Figs. 1. Unlike the embodiment of FIG. 1, the plasma reactor 11 is not realized as a structurally separate unit, but is formed in an end portion of the reaction chambers 5. Otherwise, the equivalent
    Training essentially the embodiment of FIG. 1, wherein the drive of the screw 3 of the screw conveyor is denoted by 16. Finally, in the embodiment according to FIG. 2, the induction coil 6 only extends over the first section 7 of the reaction chamber 5. The induction coil 6 is not arranged on the outside of the reactor 1 in this case. but on the inner wall.
    In the embodiment according to FIG. 3, the reaction chamber 1 is integrated with the entire plasma reactor 11 as a vertical falling-off reactor with a rotary grate 19 arranged in the bottom area (rotary grate reactor). The feedstock is fed via the material feed 2 with a gas-tight cellular wheel lock 17 and is moved downwardly due to the force effect in the downwardly expanding reactor. The reactor walls and the material are heated inductively, the induction coil being again denoted by 6. In the lower third of the reactor, a bubbler 9 opens in the reactor, with which reaction gases, e.g. 02, steam and / or CO 2 are introduced into the second section 8 of the reactor. In the lower section, a plasma injector 13 is arranged so that in the lower region of the reactor, i. Immediately above the rotary grate 19, a plasma reactor 11 is formed. The solid residues falling through the rotating grate 19 are discharged through an ash / slag outlet 15 provided with a screw conveyor 21. The synthesis gas is discharged upward via the conduit 14.
    The level of the reactor 1 can be detected by means of level meters 20, with the measured values of the level meter 20 being fed to a control device (not shown) with which the material input is controlled as a function of the level.
    权利要求:
    Claims (16)
    [1]
    Claims 1. A process for producing carbon monoxide waste synthesis gas, comprising charging the carbonaceous waste to a reaction chamber in which the waste, optionally sub-external energy supply, is subjected to pyrolysis at temperatures of 600-1,300 ° C, the resulting synthesis gas and solid residues the Reaktionskämmer be discharged, characterized in that the solid residues and / or the synthesis gas for further decomposition or decomposition plasma are exposed.
    [2]
    A method according to claim 1, characterized in that the reaction chamber comprises a first portion and a second portion connected thereto, the waste materials passing through the first portion under anoxic conditions where they are pyrolyzed, thereafter placed in the second portion and in the second portion substoichiometrically oxygen , Steam and / or CO2 is introduced to ensure conversion of the residual carbon to CO or CH4.
    [3]
    A method according to claim 1 or 2, characterized in that the reaction chamber comprises a heatable conveyor, in particular a screw conveyor, with which the waste materials are transported in the reaction chamber, in particular through the latter.
    [4]
    4. The method according to claim 3, characterized in that the first portion and possibly the second portion of the reaction Kairaner of the heated conveyor, in particular the screw conveyor, is formed.
    [5]
    5. The method according to claim 3 or 4, characterized in that the conveyor is electrically heated, in particular inductive, conductive or capacitive.
    [6]
    A method according to any one of claims 2 to 5, characterized in that the wastes in the first section of the reaction chamber are heated to a temperature of 500-1,000 ° C.
    [7]
    Process according to any one of Claims 2 to 6, characterized in that the waste in the second section of the reaction chamber is brought to a temperature of 800 to 1200 ° C.
    [8]
    Process according to any one of Claims 1 to 7, characterized in that a portion of the synthesis gas produced is burned to obtain the gasification temperature in the reaction chamber.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the plasma is generated by ionization of air, O2, H2O and / or CO2.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the solid residues and optionally the synthesis gas in the reaction zone of the plasma are brought to at least 2,400 ° C.
    [11]
    Apparatus for producing synthesis gas of carbonaceous waste materials, in particular for carrying out the method according to one of claims 1 to 10, comprising a heatable reaction chamber for pyrolysis of the carbonaceous waste materials with external energy supply, with at least one discharge opening for discharging the synthesis gas and solid residues, characterized in that the at least one discharge opening is connected to a plasma reactor (11) in which the solid residues and / or the synthesis gas are used for further re-circulation or re-use. Decomposition can be acted upon with a plasma.
    [12]
    12. The device according to claim 11, characterized in that the reaction chamber (5) comprises a heatable conveyor (3), in particular a screw conveyor, with which the waste materials in the reaction chambers (5), in particular by these, are transportable.
    [13]
    Device according to claim 11 or 12, characterized in that the reaction chamber (5) comprises a first section (7) and a second section (8) connected thereto, the first section (7) forming a pyrolysis chamber and into the second section (8). at least one line (9) for introducing oxygen and / or water vapor opens.
    [14]
    14. The device according to claim 13, characterized in that the first portion (7) and optionally the second portion (8) of the reaction chambers (5) of the heatable conveyor (3), in particular a screw conveyor, is formed.
    [15]
    15. Device according to claim 13 or 14, characterized in that the second section (8) adjoins directly the first section (7) of the reaction chamber (5).
    [16]
    16. Device according to one of claims 12 to 15, characterized in that the conveyor (3) comprises an electrical heating, in particular for inductive, conductive or capacitive heating of the conveyor (3).
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    同族专利:
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA707/2014A|AT516178B1|2014-09-16|2014-09-16|Process and apparatus for producing synthesis gas from carbonaceous waste|ATA707/2014A| AT516178B1|2014-09-16|2014-09-16|Process and apparatus for producing synthesis gas from carbonaceous waste|
    PCT/AT2015/000116| WO2016040969A1|2014-09-16|2015-09-03|Method and device for the production of synthesis gas from carbon-containing waste materials|
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