JPS6132496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the invention of a gas engine with a supercharger, which utilizes the boost pressure of the gas engine with a supercharger to mix fuel at a pressure lower than the charge air pressure and into the engine cylinder. The aim is to effectively supply a mixed gas and to achieve proper engine operation using a simple mechanism. In a gas engine, it is necessary to mix fuel gas and combustion air before the cylinder and supply this mixed gas to the engine. To obtain such a mixed gas, the fuel gas pressure must always be higher than the supply air pressure. It needs to be high. However, depending on the fuel gas generation mechanism supplied to such a gas engine, for example, in the case of gas obtained from a sewage sludge digester, blast furnace, or coke oven, the pressure is higher than the boost pressure (1 in gauge pressure).
~1.2Kg/ ^cm2 ) (for example, in the case of digestion gas from the digester tank, the
1200mmAq). Therefore, in such a case, it is necessary to make the low-pressure fuel gas higher than the engine supply pressure using a gas booster, etc., and then mix it with air using a carburetor, etc. before supplying it. A pressure boosting mechanism must be installed, and gas leaks are likely to occur in the gas supply system driven by such gas boosters, and if the room is filled with gas due to this gas leak, sparks from electrical equipment etc. This method is disadvantageous from an energy saving point of view because of the environmental conditions and other significant difficulties due to the possibility of an explosion, and of course there is a loss of driving power.

The present invention has been devised after repeated studies in view of the above-mentioned circumstances, and is a gas engine equipped with a supercharger as described above, in which combustion air is blown from the nozzle of the ejector and from the suction port of the ejector. As described above, it is preferable that the disadvantages described above are avoided by sucking the fuel gas at a pressure lower than the combustion air pressure, mixing the air and gas in the diffuser of the ejector, and supplying the mixture to the intake pipe of the gas engine. We succeeded in obtaining a supply of mixed gas.

That is, a specific embodiment of the present invention as shown in the accompanying drawings will be described. An exhaust gas turbine 3 is connected to the exhaust gas port 2 of the gas engine 1, and the exhaust gas from the exhaust gas turbine 3 is passed through a silencing mechanism 4. However, a blower 5 as a supercharger driven by the turbine 3 draws in outside air, pressurizes it, and sends it to an ejector 7 through an air pipe 6 for combustion. It is formed so as to send in air for use. This ejector 7 has a nozzle 7a and a differential user 7b,
In addition, a suction port 7c is formed on one side of the suction port 7c, and a low-pressure fuel gas supply line 9 is guided to this suction port 7c, and an adjustment valve 1 provided in the supply line 9 is connected to the suction port 7c.
4 is adapted to be adjusted by a signal obtained via a conversion mechanism 13 based on the detection result of a detection mechanism 12 such as a flow meter provided in the above-mentioned combustion air supply pipe 6. Further, a mixed gas supply pipe 15 is connected to the differential user 7b of the ejector 7, and the supply pipe 15 is led to a speed control mechanism 10 such as a damper, and from the mechanism 10, the gas is sent to the engine cylinder via a supply air collecting pipe 11. It is configured so that it can be accessed.

That is, when explaining the operation of the device according to the present invention as described above, it is clear that the output of the engine 1 and the rotation of the turbine 3 and the blower 5 are in a corresponding relationship.
If the adjustment valve 14 is operated by the detection mechanism 12 provided in the engine via the conversion mechanism 13, the fuel gas supplied from the fuel gas supply line 9 to the ejector 7 will undergo air-fuel ratio adjustment according to the output of the engine 1. It turns out. In addition, the speed control damper 10 operates according to the load fluctuation of the engine 1, and the mixed gas supply pipe 15
controlling the amount of mixed gas supplied to the engine 1 by
Since the amount of exhaust gas changes in accordance with the amount of mixed gas supplied, the rotations of the turbine 3 and blower 5 change, and in the end, the mixed gas is fed to the engine with a preferable air-fuel ratio adjusted in response to engine load fluctuations. Moreover, the fuel gas in the fuel gas supply pipe 9 is effectively sucked in even if the pressure is lower than the air supply pressure in the air pipe 6 due to the suction inducing effect in the nozzle 7c of the ejector 7. , the diffuser 7b and the mixed gas supply pipe 15, and the mixed gas is sufficiently mixed and supplied to the engine cylinder.

According to the present invention as described above, even under conditions where the fuel gas pressure supplied to the engine is lower than the supercharging air pressure, it is possible to supply a preferable mixed gas by the attraction effect using the ejector mechanism. Since there is no need for a special mechanical operating mechanism such as a special booster, there is no need for driving energy, which simplifies the overall device and makes it smaller and lighter. In addition, as mentioned above, there are no mechanical moving parts to boost the pressure of the fuel gas, so it has high durability, and it also prevents accidents caused by gas leaks and sparks caused by electrical equipment. This invention has the following effects and has great industrial effects.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention,
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing the structural relationship of a gas engine with a supercharger according to the present invention. However, in this drawing, 1 is a gas engine,
2 is an exhaust gas port, 3 is an exhaust gas turbine, 5 is a blower, 6 is an air pipe line, 7 is an ejector, 7a is its nozzle, 7b is its diffuser, 9 is a fuel gas supply pipe line, 10 is a speed control mechanism, 12 13 is a detection mechanism, 13 is a converter, 14 is a control valve, and 15 is a mixed gas supply pipe.

Claims (1)

[Claims] 1 In a system in which combustion air is mixed with fuel gas and supplied to the engine via a supercharger,
An ejector having a nozzle and a diffuser is provided in the combustion air pipe leading from the supercharger to the engine, and a fuel gas supply pipe is connected to the nozzle, and the combustion air is injected from the nozzle to cause the combustion. 1. A gas engine with a supercharger, characterized in that fuel gas having a lower pressure than air is induced, mixed with the air by a differential user, and supplied to the engine as a mixed gas.