Abstract:
A fuel for compression-ignition engines is described, which contains mono oxymethylene dimethyl ether and has a cetane number of ≧51. This fuel for compression-ignition engines advantageously contains oxygenates of the n-polyoxaalkane type and/or di-tert-butyl peroxide. Up to about 20% by weight of the mono oxymethylene dimethyl ether can be replaced by dimethyl ether.
Abstract:
The invention relates to a self-igniting internal combustion engine (10) with ether fumigation of the combustion air for vehicles, wherein to provide for ether fumigation, a feed means (1, 2, 3) is provided for an alkanol fuel in the flow direction, an exhaust gas heat exchanger (4) is provided for cooling a portion of the exhaust gas arising from the firing of the internal combustion engine (10) and for vaporizing the alkanol fuel fed while at the same time absorbing the thermal energy to be dissipated during cooling of the exhaust gas, and a catalyst (5) is provided for dehydrating the evaporated alkanol fuel to form ether, and wherein the feed means (1, 2, 3), the exhaust gas heat exchanger (4) and the catalyst (5) are connected to the combustion chamber of the internal combustion engine (10) and adapted in such a way that a portion of the fuel required to fire the internal combustion engine (10) can be fed to the combustion chamber of the internal combustion engine (10) by way of the ether fumigation of the combustion air while mixing in the exhaust gas cooled in the exhaust gas heat exchanger (4). The invention further relates to a method for ether fumigation of the combustion air in a self-igniting internal combustion engine for vehicles.
Abstract:
The invention relates to a method for the selective catalytic reduction of nitrogen oxides using ammonia in exhaust gases of vehicles, whereby solutions of guanidine salts with an ammonia forming potential of between 40 and 850 g/kg, optionally in combination with urea and/or ammonia and/or ammonium salts, are catalytically decomposed in the presence of catalytically active, non-oxidation-active coatings of oxides selected from the group containing titanium dioxide, aluminum oxide, silicon dioxide or the mixtures thereof, and hydrothermally stable zeolites which are fully or partially metal-exchanged. The guanidine salts according to the invention enable a reduction of the nitrogen oxides by approximately 90%. Furthermore, said guanidine salts can enable an increase in the ammonia forming potential from 0.2 kg, corresponding to prior art, up to 0.4 kg ammonia per litre of guanidine salt, along with freezing resistance (freezing point below −25° C.). The risk of corrosion of the guanidine salt solutions used according to the invention is also significantly reduced compared to that of solutions containing ammonium formiate.
Abstract:
The invention relates to a low-soot diesel fuel comprising a fuel additive, to the uses thereof and to the use of the fuel additive for producing low-soot diesel fuels. The diesel fuels are mineral-based, optionally with additions of FAME or XTL diesel fuels, which are formulated with polyoxaalkanes of the general formula (I): R1(—O—CH2—CHR2)m—O—R3 (I) In the formula (I), the R1 radicals are each a straight-chain or branched alkyl radical, R2 is a straight-chain or branched alkyl radical or H, and R3 is likewise a straight-chain or branched alkyl radical. In addition, m is ≧1, and the fuel additive is essentially free of toxic constituents. Diesel fuels formulated in this way, even at a low polyoxaalkane content, have significantly reduced soot formation. The proportion of premixed combustion and the density are increased, and the volumetric reduction in calorific values which occurs when CH2 groups in long-chain alkanes are replaced by O groups can be compensated for. The invention further relates to a process for homogenizing diesel fuel/alkanol mixtures, in which addition of the polyoxaalkanes described affords a monophasic diesel fuel. Such mixtures are of interest with regard to falling crude oil reserves, because primary alcohols such as ethanol can be prepared readily and inexpensively from organic starting materials.
Abstract:
A method for reducing the particle and nitrogen oxide proportion in an exhaust gas flow of an internal combustion engine includes supplying a reducing agent to the exhaust gas flow, subjecting the exhaust gas flow containing the reducing agent to particle filtering, and then carrying out a selective catalytic reduction of at least a portion of the nitrogen oxides in the exhaust gas flow. The method and an exhaust gas treatment unit make it possible to simultaneously reduce the proportion of particles and nitrogen oxides in the exhaust gas. Ammonia, in particular, is used as the reducing agent. Regeneration of the particle filter is promoted by leading an ammonia-containing flow of gas through the particle filter. The method and device make it possible to consume less fuel with the same reaction rate and, at the same time to reduce available installation space, in comparison with existing corresponding prior art systems.
Abstract:
A device for treating exhaust gases includes a particle separator, an SCR catalytic converter for selectively reducing nitrogen oxides and an ammonia generator for generating ammonia as a selective reducing agent for reducing nitrogen oxides. The particle separator is provided in a main exhaust line and the ammonia generator is provided in a first secondary line. The first secondary line opens into the main exhaust line at a junction in such a way that an ammonia-containing gas stream generated in the ammonia generator can flow through the SCR catalytic converter. The method and the device advantageously permit the proportion of particles and nitrogen oxides (NOx) contained in the exhaust gas of an internal combustion engine to be reduced simultaneously, with the energy consumption for this reduction being small and at the same time the entire device being embodied as a compact unit.
Abstract:
A combination exhaust gas post treatment/muffler device in the exhaust gas section of an internal combustion engine is provided. The exhaust gas post treatment within the muffler, which forms sulfuric acid, takes place in at least one exhaust gas post treatment/muffler module, and only that housing thereof through which flows exhaust gas that is to be cleaned is produced from ferritic or austenitic stainless steel, thus making it possible to produce the outer walls of the muffler, as well as any inner element thereof, such as a transverse wall, that is disposed externally of the exhaust gas post treatment/muffler module of unalloyed sheet steel that is coated with aluminum or some other material.
Abstract:
A feed device for supplying solid urea granules into an ammonia generator arranged within or outside of an exhaust line for production of ammonia makes possible NOx reduction with the catalytic purification of exhaust of an internal combustion engine, gas turbine, or a burner, whereby the solid urea granules are stored in a holding tank. No compressed air support for transporting and metering the urea granules is required and transporting and metering of the urea granules adapted to the ammonia specifications is possible. The feed device has a housing with an inlet for supplying the urea granules and internally, a motor-driven, rotating disk with at least one spiral-shaped acceleration channel, as well as an outlet leading outward, to which a tube leading to the ammonia generator is connected.
Abstract translation:用于将固体尿素颗粒供给到布置在用于生产氨的排气管线内或外的氨发生器中的进料装置使得可以通过内燃机,燃气轮机的排气的催化净化来实现NO x 或燃烧器,由此将固体尿素颗粒储存在储存罐中。 不需要用于运输和计量尿素颗粒的压缩空气支撑物,并且适合氨规格的尿素颗粒的输送和计量是可能的。 进料装置具有壳体,其具有用于供应尿素颗粒的入口和内部具有至少一个螺旋形加速通道的马达驱动的旋转盘,以及向外引导的出口,导向氨的管 发电机连接。