DE2742609A1 - Preventing excessive nitrogen oxide formation during combustion - by adding oxygen binding agent, pref. extra fuel after initiation - Google Patents

Abstract

The fuel is treated with an additive which combines with the free O2. It pref. is added after combustion has started. In particular, normal fuel is injected into the centre at the highest temp. The method is used partic. with diesel engines. The equipment has an injection pump plunger with a groove, which stops short on extending beyond the edge of the leading edge over the return opening in the injection procedure. so that it is completed with a very small amt. re-injected. re-injection must not be like dripping but must be forcible, to attain combustion in the core at the increased pressure already reached in the cylinder. The very small amt. used is than ensuring that NOx formation is near the permissible limit. An alternative arrangement used a cma stopping short at the apex with the effect of pressure, to re-inject a small amt. with the protuberance. The plunger dia. or its stroke about the injection shutter is enlarged by the groove.

Description

Reduction of excessive NOx formation during the combustion process in diesel

Engines.

The exhaust gases from diesel engines are opposite in terms of Co and CnHm proportions those of gasoline engines are probably considerably less harmful, but not with their NOx Diesel engines with more economical energy conversion from fuel are now showing higher WOX emissions than e.g. pre-chamber engines. Tests have shown that a dampened combustion process in the cylinder, which keeps NOx formation lower than a brisnter.as Apart from the lower compression end temperature, damping means are those im Hot residual gases left in the combustion chamber are used. As the engine development but on low fuel consumption and power gain with lower average Targeting the engine temperature, is more future-oriented, should with the subject of the invention, without To take over the disadvantages mentioned, a low NOx formation can be achieved Boudoir disintegrates CO2 over 100,000 again, whereby the free 0 and the free N binds to NOx, depending on the quality of the combustion chamber and the excess air 0 no other possible connection part than the free N.

According to the subject of the registration, the combustion chamber should only be considered with consideration for the best energy conversion i.e. the highest possible performance with the lowest fuel consumption be formed even in explosive combustion, whereby the NOx formation damping intervention may only take place from the outside when the pressure and temperature in the cylinder have been reached si @ are, in which the CO decay and the excess air are the preconditions @@@ for bonding with the free! have occurred.

According to the invention, that is in the Brennberd, after a connection is secured free 0, instead of the N a substance is offered that ar the not yet finished burning process holds in solid form, but does not result in harmful compounds. This is due to subsequent but @eite just after injection of a CnHm or gas achievable.

The simplest addition, the one with the same pump, but a little modified, is diesel fuel, the subsequent injection a gas or water-soluble fuel would have had a greater effect but the operation more complicated. The simplest addition remains the normal one for the engine Fuel that, after the normal injection process has ended and a short pause, t is the smallest amount The @@@@@ must not be so long that pressure and the temperature in the cylinder has dropped again are, but also not so briefly that the maximum values for pressure and temperature have not yet been reached.

According to the subject of the application, the plunger 1 of the injection pump can have a groove 3 parallel to the control edge 2, which is s # wide in order to achieve the above-mentioned injection pause or a fuel pump that runs a bit 6 further in the highest elevation to then with a The latter has the disadvantage of also having an effect in the lower partial load area, where the ITOx formation is insignificant, while the channel on the pump plunger is only effective where it is needed. Both types require enlargement of the stroke or the plunger.

L e r s e i t e

Claims (1)

Protection claims. 1.) Reduction of excessive NOx formation during the combustion process by adding an agent to the fuel, which becomes free during the burning process Oxygen from a bond & n nitrogen offers and so the NOx formation steams. 2.) reduction .. according to claim 1, characterized in that this Addition only takes place when the firing process has already started fully 3.) Reduction .. marked by injecting normal fuel into the area of the highest combustion temperature. 4.) Reduction. characterized by an injection pump plunger (1) with a channel (3), which when the control edge (2) is exceeded via the return opening (4) briefly interrupts the injection process and then injects a small amount of it The after-spraying must not resemble a dripping, but must be powerful be in order to get to the core of the cylinder with the pressure increase in the meantime Combustion to arrive. (3) 5.) Reduction .. characterized in that the channel / does not extend into the smallest partial load range, but only in the load range begins at which the NOx formation comes close to the permissible limit. (6) 6.) Reduction .. characterized by a cam on the apex with the pressure effect briefly ceases to with the hump (7) a small additional amount with to inject the effect of the preceding claims. 7.) Reduction .. characterized in that either the knife or its stroke by the injection loss through the Hinne / event with surcharge are increased.