JPH06235352A - Fuel gas feeding device for torch ignition type gas engine - Google Patents

Abstract

PURPOSE:To realize the excellent ignition combustion by generating the proper mixing condition between the fuel gas in a torch ignition subchamber and air even in the case where the pressure at a fuel gas supply source is low, by installing a gas compressor controller into which a signal is inputted from a pressure switch for detecting the pressure in a pressure tank and which controls the operation of the gas compressor by the above-described signal. CONSTITUTION:The subchamber gas which is pressurized by a gas compressor 08 is introduced into a pressure tank 11. A pressure limit switch 12 is installed in the pressure tank 11, and the signal of the pressure switch 12 is inputted into a gas compressor controller 35. The gas compressor controller 35 turns ON/OFF an electromagnetic clutch 09 by the signal supplied from the pressure switch 12 and performs the control to a prescribed pressure, and the gas is branched in two directions. The gas is controlled to the low pressure (on start) and the high pressure (in loaded operation) by the pressure adjusting valves 18 and 20 arranged in the branched pipes 15 and 16. Accordingly, even in the case where the pressure at a fuel gas supply source is low, the smooth operation of a torch ignition gas engine equipped with a supercharger is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of igniting a fuel gas for ignition introduced into a sub-chamber for torch ignition with a spark plug, ejecting the fuel gas into a main combustion chamber and igniting and burning the mixed gas in the main combustion chamber. To a fuel supply device for a torch ignition type gas engine.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional torch ignition type gas engine. In the figure, 130 is a piston, 132
Is an engine body, 131 is a main combustion chamber, 125 is a torch ignition sub-chamber, and 124 is a spark plug provided in the sub-chamber 125.

Fuel gas passes from a fuel gas supply source pipe 101 to a gas engine supply source pipe 102, where a main fuel gas supply pipe 103 and a torch ignition sub chamber gas supply pipe 10 are provided.
7 and branch.

The main fuel gas is supplied from the gas supply pipe 103 to a solenoid valve 104, a pressure adjusting valve 105, a throttle valve 106,
Gas pressure through the gas mixer 127 and the supercharger 128,
The flow rate is adjusted, mixed with air, and taken into the main combustion chamber 131 in the intake stroke of the engine.

On the other hand, the fuel gas for the torch ignition sub-chamber is adjusted to a required pressure in advance by the pressure adjusting valve 118 via the electromagnetic valve 108, and mainly passes through the check valve 123 in the intake and exhaust strokes of the engine and then the torch ignition sub-chamber. It is supplied in 125. Then, in the vicinity of the engine compression top dead center, the gas in the torch ignition sub-chamber 125 is ignited by the discharge of the spark plug 124, and this gas is ejected into the mixed gas in the main combustion chamber 131 to ignite and burn the mixed gas.

In the engine with a supercharger, the pressure of the torch ignition sub-chamber gas is higher than the engine intake air pressure due to the engine intake operation (generally 1 kgf / cm ² or more).
Requires supply pressure. For this reason, generally, a torch ignition type gas engine with a supercharger is adopted under the gas condition that the internal pressure of the fuel gas supply pipe 101 exceeds 1 kgf / cm ² . Reference numeral 133 is a throttle valve control device, 134 is a switching control device for the solenoid valves 104 and 108,
126 is an air suction pipe.

[0007]

Since the torch ignition type gas engine with a supercharger is supercharged by the supercharger 128, the pressure in the cylinder during the intake stroke is high (usually 1 kgf).
/ Cm ² ). Therefore, the supply pressure of the sub-chamber gas that is mainly supplied directly into the torch ignition sub-chamber during the intake and exhaust strokes must naturally be higher than the pressure in the cylinder during the intake stroke.

Generally, gas engines are often used in the area where city gas pipes are laid for stationary power generation, and the supply gas pressure in this area is 150.
Low pressure area of about ~ 200mmAq, 1.0 ~ 1.5kg
Although there is a medium pressure region of about f / cm ^2, there is a problem that the conventional torch ignition gas engine with a supercharger can be installed only in the medium pressure region.

Further, the torch ignition sub-chamber gas supply pressure needs to be a pressure suitable for each of the above conditions depending on the output of the gas engine, the specification conditions, the operating load conditions, etc. However, in the conventional device as shown in FIG. There is also a problem that this cannot be obtained.

It is an object of the present invention to solve the above problems and to operate a gas engine with a supercharger while maintaining a required performance even when the supply pressure of the fuel gas is low. To provide a supply device.

[0011]

In order to solve the above-mentioned problems, the present invention is characterized by having the following constitution. (1) A gas compressor driven by an electric motor with an electromagnetic clutch is installed in the torch ignition sub-chamber gas supply pipe, and a pressure tank and a pressure limit switch are installed in the outlet pipe of the compressor to adjust the gas compressor outlet pressure. Enable automatic control to a predetermined pressure.

(2) The sub-chamber gas supply pipe after discharge from the gas compressor is branched into two systems, and a pressure adjusting valve is provided in each pipe line, and the adjusting valve is at a high pressure (generally 1 kgf / cm ² or more).
And a low pressure (generally 1 kgf / cm ² or less) can be adjusted, and a solenoid opening / closing valve is installed in each of them to obtain a wide range of pressures according to engine conditions.

[0013]

When the supply pressure of the fuel gas main pipe is low at about 150 mmAq, the electric compressor installed at the inlet of the torch ignition sub-chamber gas supply pipe is always operated during steady operation other than startup. In the operating state, the fuel gas is pressurized to several kgf / cm ² by the compressor and is discharged.

A pressure tank is arranged in the outlet line of the gas compressor, and the pressure clutch switches the electromagnetic clutch of the gas compressor to ON or OFF to control the pressure in the pressure tank to a predetermined pressure. Fuel gas is several kg by compressor
After being pressurized to a predetermined pressure of f / cm ² , it is branched in two directions, and is controlled to a low pressure (at the time of starting) and a high pressure (at the time of load operation) by pressure regulating valves arranged in the respective pipelines. The solenoid valves provided at the respective inlets of the respective pipes switch to the pipes that match the fuel gas and the operating conditions of the engine and supply the gas to the torch ignition sub-chamber.

Accordingly, since the supercharger does not work sufficiently at the time of starting and the air supply pressure into the cylinder is low, the gas pressure supplied to the torch ignition sub-chamber is made low to improve the ignition performance at the time of starting. Under high load operating conditions, the supercharger functions sufficiently, so that the supply pressure of air to the cylinder becomes high.
Therefore, by increasing and supplying the gas supply pressure in the torch ignition sub-chamber, the mixing conditions of the fuel gas and air in the torch ignition sub-chamber become appropriate, and ignition combustion becomes good.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing a fuel supply system for a gas engine according to the present invention.

In the figure, 30 is a piston, 32 is an engine body, 28 is a supercharger, 26 is an air intake pipe, 27 is a gas mixer, 51 is an intake valve, and 52 is an exhaust valve. Again 3
Reference numeral 1 is a main combustion chamber, 25 is a torch ignition sub-chamber, and 24 is a spark plug mounted in the sub-chamber.

Reference numeral 01 is a fuel gas supply pipe for supplying a fuel gas, 02 is a fuel gas supply pipe for a gas engine, 03
Is a main fuel gas supply pipe, 03 'is a sub-chamber gas supply pipe branched from the main fuel gas supply pipe 03, 04 is a solenoid valve interposed in the main fuel gas supply pipe, and 07 is a sub-chamber gas supply pipe 03 '
Is a solenoid valve, 05 is a pressure adjusting valve provided in the main fuel gas pipe supply path, and 06 is a throttle valve.

Reference numeral 08 is a gas compressor provided in the sub chamber gas supply pipe 03 ', 09 is an electromagnetic clutch for the compressor, 10 is a motor for driving the compressor, 11 is a pressure tank, and 12 is attached to the pressure tank 11. It is a pressure switch.

The sub-chamber gas supply line 13 at the outlet of the pressure tank 11 is branched into two gas supply lines 15 and 16 for high pressure and low pressure. Electromagnetic valves 17 and 19 and pressure adjusting valves 18 and 20 are provided in the high and low pressure gas supply lines 15 and 16, respectively. The high and low pressure gas supply lines 15 and 16 are merged after the outlets of the pressure control valves 18 and 20 to form a gas supply line 21, which is connected to the torch ignition sub chamber 25. An electromagnetic valve 22 and a check valve 23 are provided in the gas supply line 21.

33 is a controller for controlling the throttle valve 06,
Reference numeral 34 is a conduit control device that controls the opening and closing of the solenoid valves 04 and 07, 17 and 19, and 35 is a gas compressor controller that operates the pressure switch 12 for the pressure tank 11, the motor 10 of the gas compressor 08 and the clutch 09.

150 mmAq from the fuel gas supply pipe 01
The fuel gas whose pressure has been adjusted passes through the gas engine fuel gas supply source pipe 02, and its supply path is branched for the main fuel gas and the torch ignition sub chamber gas (hereinafter referred to as sub chamber gas). The flow rate of the main fuel gas is adjusted in accordance with the load condition of the engine 32 by the main fuel gas supply pipe 03, the solenoid valve 04, the main pressure adjusting valve 05, and the fuel gas throttle valve 06. Further, the main fuel gas enters the gas mixer 27, where it is mixed with the air sucked through the air suction pipe 26, compressed by the supercharger 28, and sucked into the main combustion chamber 31 during the suction stroke.

On the other hand, the sub chamber gas is supplied to the sub chamber gas supply pipe 03 '.
Further, it passes through the solenoid valve 07, is pressurized by the sub-chamber gas compressor 08, and is discharged to the sub-chamber gas supply line 13. The sub-chamber gas compressor 08 is constantly operated by the electric motor 10 via the electromagnetic clutch 09.

The sub-chamber gas pressurized by the gas compressor 08 enters the pressure tank 11. A pressure limit switch 12 is attached to the pressure tank 11, and a signal from the pressure switch 12 is input to the gas compressor controller 35. The gas compressor controller 35 turns on and off the electromagnetic clutch 09 by the signal from the pressure switch 12.
F and control to a predetermined pressure of several kgf / cm ² .

The sub-chamber gas adjusted to a predetermined pressure of several kgf / cm ² is branched in two directions. An electromagnetic valve 17 and a pressure adjusting valve 18 are disposed in the high pressure sub-chamber gas supply pipe 15 of the branched pipe, and the fuel gas in the pipe 15 is
Pressure higher than the cylinder pressure during the suction stroke (usually 1k
gf / cm ² or more).

An electromagnetic valve 19 and a pressure adjusting valve 20 are provided in the low pressure sub-chamber gas supply pipeline 16, and the gas pressure in the pipeline 16 is adjusted to a low pressure (usually 1 kgf / cm ² or less). It The switching of the pipeline is performed by a control signal from the pipeline controller 34, and the solenoid valve 1 for the low-pressure pipeline is started at the time of starting.
9 is opened and the solenoid valve 17 for the high pressure line is closed, and during load operation, control is performed so as to be the opposite.

The sub-chamber gas whose pressure has been adjusted according to the respective operating conditions is torch-ignited via the check valve 23 when the pressure in the main combustion chamber 31 is lower than the sub-chamber gas supply pressure via the flow rate adjusting valve 22. It is supplied into the sub chamber 25.

During the compression stroke of the engine, the thin mixed gas in the main combustion chamber is ejected from the lower injection port of the torch ignition sub-chamber 25 into the torch ignition sub-chamber 25 for further mixing, and spark ignition by the spark plug 24 near the end of the compression stroke. Then, the flame is jetted from the lower portion of the ignition and torch ignition sub-chamber 25 to ignite the lean mixed gas in the cylinder 31 and burn it.

[0029]

According to the present invention, by disposing the gas compressor and the pressure control device in the sub-chamber gas supply line,
It is possible to provide a fuel gas supply facility that can smoothly operate a torch ignition gas engine with a supercharger that requires a high sub-chamber gas pressure even when the fuel gas supply source pressure is low.

By disposing two pipes having different sub-chamber gas supply pressures, it is possible to obtain a torch ignition sub-chamber gas supply pressure that matches operating conditions, engine specifications, etc. In both cases, the ignition conditions are good, which is effective in improving engine combustion and exhaust gas.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a corresponding diagram of FIG. 1 showing a conventional example.

[Explanation of symbols]

01 ... Fuel gas supply pipe, 03 ... Main fuel gas supply pipe, 0
3 '... sub-chamber gas supply pipe, 08 ... gas compressor, 11
... pressure tank, 12 ... clutch, 15 ... high pressure gas supply pipe, 16 ... low pressure gas supply pipe, 17, 19 ... solenoid valve, 1
8, 20 ... Pressure control valve, 24 ... Spark plug, 25 ... Torch ignition auxiliary chamber, 26 ... Suction pipe, 31 ... Main combustion chamber, 34 ... Pipe line control device, 35 ... Gas compressor controller.

Claims (2)

[Claims] 1. A torch ignition type gas engine of a type in which a sub-chamber gas introduced into a torch ignition sub-chamber is ignited by a spark plug and ejected from the sub-chamber into a main combustion chamber to be burned. Sub-chamber gas pipeline (03 ') branched from the gas supply pipe (03) and connected to the torch ignition sub-chamber (25)
A gas compressor (08) for compressing and boosting the pressure of the fuel gas in the pipe line (03 ′), a pressure tank (11) accommodating the fuel gas at the gas compressor outlet, and a pressure tank (11) And a gas compressor controller (35) for controlling the operation of the gas compressor by the signal from the pressure switch (12) for detecting the pressure of the torch ignition type gas engine. Gas supply device. 2. The high pressure and low pressure gas supply pipelines (15, 16) of two systems are provided for the sub chamber gas supply pipeline (13) at the pressure tank outlet.
The high and low pressure gas supply pipelines (15, 16) each have a solenoid valve (17, 19) for opening and closing the pipeline and a pressure regulating valve (18, 20) for regulating the pressure of the pipeline. The conduit control device (34) for outputting a control signal for adjusting the pressure of the high and low pressure gas supply conduits is provided in each of the solenoid valves (17, 19). Gas supply device for torch ignition type gas engine.