METHOD FOR PRODUCING SYNTHETIC GAS

The present invention pertains to techniques for processing hydrocarbon raw material and more precisely to the production of synthetic gas from gaseous hydrocarbon raw material. This invention essentially relates to a method for producing synthetic gas, wherein said method comprises burning a mixture of hydrocarbon raw material and air according to the formula alpha =0.5 DIVIDED 0.8. The hydrocarbons are oxidised during compression of the mixture by a piston in the cylinder volume of an internal combustion engine. The products resulting from this process are further expanded and cooled when the engine piston moves towards the bottom dead centre. The products containing the synthetic gas are then expelled from the reaction volume when the piston moves towards the top dead centre and a new load of working mixture is supplied when the piston moves back to the bottom dead centre. The mixture of hydrocarbon raw material and air is previously heated at a temperature between 200 and 400 DEG C before being fed into the cylinders of a compression-type internal combustion engine. The mixture is compressed until autoignition occurs at a temperature between 1300 and 2300 DEG C and for a period between 10 and 10 second. This cycle is then repeated at a frequency exceeding 350 min. This method may use as raw material methane, ethane or other gaseous hydrocarbons mainly produced during the separation of the large fraction of light hydrocarbons from petroleum gas. This method may be used to improve ecological conditions in crude-oil producing and processing regions, and has a specific yield which is 2.5 times superior to that of known methods. Cette invention se rapporte aux techniques de traitement de matières premières de type hydrocarbures et, notamment, à la production de gaz de synthèse à partir de matières premières gazeuses de type hydrocarbures. Cette invention concerne essentiellement un procédé de production de gaz de synthèse qui consiste à brûler un mélange de matières premières hydrocarbures et d'air selon la formule alpha =0,5 DIVIDED 0,8. Ce procédé consiste ensuite à oxyder les hydrocarbures lors de la compression du mélange par un piston dans le volume des cylindres d'un moteur à combustion interne. Les produits issus de ce processus sont ensuite détendus et refroidis lorsque le piston du moteur se déplace vers le point mort bas. Ces produits, qui contiennent le gaz de synthèse, sont ensuite expulsés du volume de réaction lorsque le piston se