DE887285C - Operating method for four-stroke gas engines working with mixture compression - Google Patents

Description

Operating procedure for four-stroke gas engines working with mixture compression It is a disadvantage of the previously common operating methods for mixture compression working gas engines, preferably generator gas engines, that the engine is combustible Gas-air mixture is sucked in, whereby the loading capacity, based on the calorific value, is opposite only air-sucking engines (diesel engines) is severely restricted, which is proportionate results in low working pressure.

In order to remedy this problem, it has already been proposed on At the end of the extension stroke, i.e. before the start of suction, compressed air through the open To blow the inlet valve into the cylinder so that the exhaust gas still in the cylinder pushed through the exhaust valve, which is also still open, into the exhaust line will. After the suction process was completed, it was repeated until the inlet valve was closed Compressed air blown into the cylinder. Between these two air charges was however, as with the usual gasoline engine, gas and air are drawn in together. So it was the suction force of the cylinder is not used to its full extent to suck in pure gas, especially since the amount of compressed air introduced at the beginning of the intake stroke initially expands had to make the suction force of the piston effective.

The invention now shows a way to avoid the gas charge to increase the previously known method significantly (up to more than double) without the Gas to have to introduce in a pre-compressed state. According to the invention, the Suction power of the piston is only used to suck in gas, So not as before for sucking in a gas-air mixture, and only after the desired gas charge is completely in the cylinder, is towards or at the end combustion air is recharged during the suction stroke.

So apart from the large gas charge, D'as method offers the the operational advantage that one outside of the engine: There is no horizontal gas-air mixing device and the entire gas generation system or the gas reservoirs do not need to have overpressure, so as before it is possible to work in suction gas operation in generator gas systems.

For that. Air reloading can be practiced. air supercharger, serve.

In order to correctly evaluate the success of the method according to the invention, One must note that a standard four-stroke generator gas engine is about ho o / o its own Pumping speed for introducing the air charge and about 40% for introducing the gas charge expends. If this sniffing ability is only used for gas charging, one can, based on the same temperature, according to the invention without gas fan and without blown gas generator, as already indicated, more than twice as much gas in the Bring in cylinder.

It is advantageous to run the generator gas only so far after dedusting to cool down than is permissible in order to remove the hydrocarbons contained in the gas as gas, obtain in vapor or mist form, e.g. B. to roo ° C. Even then you achieve, on related to the calorific value, according to the method according to the invention still an abundant one Filling with gas. Thus, the invention offers a way to also gas containing tar to be able to use the motor. In order to do this smoothly, further expansion will be required of the invention, all gas-flushed walls, pipelines, regulating and introducing organs Maintained at such a temperature that tar mist does not become a sticky liquid can precipitate, The regulation of the engine power can be done in such a way, that the beginning of the air recharge at full load in the dead center at the end of the suction stroke and is shifted into the suction stroke when the power decreases.

In order to be able to use a favorable compression ratio, according to the invention the air immediately before entering the working cylinder, advantageously by dusting effectively cooled by water.

Claims (1)

PATENT CLAIMS: r. Operating procedures for those working with mixture compression Four-stroke gas engines, preferably device gas engines, characterized in that the suction power of the motor is used to only draw in gas, while the combustion air is being recharged towards or at the end of the suction stroke. Operating method according to claim r, characterized in that that from the gas generator incoming dedusted gas is only cooled as far as is permissible to the hydrocarbons to be introduced into the gate in gas, vapor or mist form. 3. Operating procedures according to claim 2, characterized in that all gas-flushed walls, especially , the gas regulating and introducing organs, on such a temperature state, e.g. B. zoo ° C, to prevent the tar mist from precipitating. q .. Operating method according to one of Claims z to 3, characterized in that the combustion air to be recharged immediately before introduction into the engine, preferably by dusting with water.