Method of starting gas engine

FIELD: engines and pumps.

SUBSTANCE: proposed method consists in gas feed into cylinders and cylinder antechamber, spark ignition of gas in antechambers, and feed of gas combustion product from antechamber into combustion chambers of engine cylinders. At starting gas engine at crankshaft cranking by starter to stable idling rpm, gas is forced into engine cylinder antechamber and/or gas engine cylinders, gas volumetric combustion heat exceeding that of natural bas by some 1.5-2 times and higher. At starting the gas engine, fuel gas can be fed into some cylinders of multicylinder gas engine.

EFFECT: higher reliability of starting and accelerated starting.

2 cl, 1 dwg

 

The invention relates to gas engines for vehicles, in particular for diesel engines, use as fuel, natural gas, and is aimed at improving the reliability and accelerate the process of starting the engine.

There is a method of starting a gas engine with compression ignition, in which for stable ignition of the fuel in the combustion chambers of the cylinders, including the start-up mode, and reduce harmful emissions from the exhaust system, compressed or liquefied fuel gas ("first component") from a single tank of pre-mixed with the initiator ignition ("second component") from another tank for receiving pressurized mixed fuel, which is then fed through the injector into the combustion chamber of the engine (RU, patent No. 2369754 C2, IPC F02B 43/00, F02M 21/02, 43/04, C10L 3/06, 3/12, 2005).

The disadvantage of this method of operation of the gas engine is the need for pre-mixing of fuel gas with a substance - initiated ignition, the volatility processes of ignition of the gas in the cylinders in case of deviation from the optimum ratio of fuel gas and initiator plug in the mixed fuel supplied to the combustion chamber of the engine on start-up mode. Transportation on the locomotive flammable substances - "initiator ignition" is logstat design of the fuel system and increases the risks in relation to fire safety gas engine and a diesel locomotive.

There is a method of starting a gas engine with forcamera-flare ignition, in which fuel gas is fed to the precombustion chambers of the cylinder at the starting line containing a throttle, and the working line through the check valve and choke. To air channels of the cylinder the gas is fed by collector cylinder gas inlet in which is mounted a gear-knob, input cylinder gas into the air ducts of the cylinder is installed dispensers, controlled by the controller to the engine speed. When the engine is running the dispensers are installed in a fully open position. This launch method improves the reliability of gas supply system in the pre-chamber engine (RU, patent No. 2103539 C1 IPC F02B 19/00, 43/00, F02M 21/02, F02D 19/02, 1995).

The disadvantage of this method of starting a gas engine with precombustion chambers is low gas pressure before cylinder, which reduces the gas flow into the cylinders and the heat in the cylinders increases the duration of the run.

There is a method of starting a gas engine with forcamera-flare ignition, which is graded by the amount of the gas in the cylinders of the engine during start-up, which uses three of the electromagnetic valve with choke, which consistently include for the supply of gas into the cylinders upon reaching the crankshaft, Pref is needed by the engine starter, certain speeds. The inductors are selected to pass into the cylinders of a certain amount of gas in each of the three intervals of the frequency of rotation of the crankshaft. The solenoid valve is an electronic device signals tachometric sensor. The economic effect of the invention is provided with the exception of the idle engine operation due to failures of launch system (RU, patent No. 2096652 C1 IPC F02B 43/00, F02N 9/00, F02D 19/02, 1995).

The disadvantage of this method is the complexity of the device of the gas delivery system, and the need for experimental determination of the optimum flow area used chokes for parameter optimization run.

There is a method of starting a gas engine, recommended for gas engines stationary and transportation facilities adopted for the prototype of the invention. The gas delivery system provides for the flow of gas through the pre-chamber and directly into the cylinders of the gas engine, spark ignition of the gas in the precombustion chambers and burning gas-air mixture in the cylinders of the torches from the precombustion chambers. The method differs in that when the engine is running in the process of increasing the frequency of rotation of the crankshaft of the engine to the frequency of rotation of idling gas serves only in the pre-chamber in a quantity not exceeding 25% of rebamol total regulated gas supply. When the engine reaches a stable frequency of rotation of idling include the gas directly into the cylinders of the engine (RU, patent No. 2103542 C1 IPC F02B 19/00, 43/00, F02M 21/02, F02D 19/02, F02N 17/00, 1995).

The disadvantage of this method of starting a gas engine is reduced cyclic feed of fuel gas through the pre-chamber on the modes of the motor accelerates up to 25% of the necessary amount of cycle counter, which entails an increase in the duration of the run.

The technical result of the invention is the provision of reliability and shorter duration of processes running the gas engine.

This technical result is achieved by the fact that when you start the gas engine, is used as the primary fuel natural gas, including natural gas supply to the cylinders and the pre-chamber cylinder, spark ignition of the gas in the precombustion chambers, the flow of combustion products of gas from the precombustion chambers in the combustion chamber of the cylinders of the engine, in the period from the beginning of rotation of the crankshaft by the starter before going steady idling speed in the pre-chamber engine cylinder or cylinders of the gas engine serves a fuel gas with a volumetric heat of combustion greater than the volumetric heat of combustion of natural gas 1.5-2 or more times, and fuel gas shall be made part of the cylinder mn is gallendawagon gas engine.

The drawing shows a schematic flow of fuel gas to implement the method of starting a gas engine.

The gas engine 1 is installed, for example, in locomotives equipped with electric starter 2, resulting in a rotation of the crankshaft 3 when starting the gas engine 1. To the combustion chambers 4 cylinder gas engine 1 through the channels 5 of the intake valves of the manifold 6 cylinder gas through the solenoid valve 7 is supplied with natural gas from the tank 8 or through the electromagnetic valve 9 gas with a high heat of combustion from the tank 10. To the precombustion chambers 11 and collector 12 prechamber gas announced natural gas through the solenoid valve 13 from the tank 8, and through the solenoid valve 14 is a gas with a high heat of combustion from the tank 10. Control start engine 1 is carried out using automated remote control 15, which is electrically connected to the sensor tachometer 16, measuring the rotational speed of a crankshaft 3 of the engine 1, and the electromagnetic valves 7, 9, 13 and 14. Starting the engine 1, and setting the desired mode of operation of the engine 1 is produced by moving the handle 17 of the automated remote control 15.

The proposed method of starting a gas engine that uses as its primary fuel natural gas, is as follows.

When starting the gas engine 1, use as a primary fuel natural gas, including natural gas supply from the tank 8 to the manifold 6 cylinder gas combustion chamber 4 of the cylinder, the gas in the pre-chamber 11 of the cylinder through the manifold 12 prechamber gas, spark ignition of the gas in the precombustion chambers 11 and the flow of flue gases from the precombustion chambers 11 in the combustion chamber 4 cylinder engine, turn the control handle 17 automated remote control 15 in the start position, while the signals:

- to switch on the starter;

- at the opening of the electromagnetic valve 14, which connects the collector 12 prechamber gas tank 10 containing fuel gas with a volumetric heat of combustion greater than the volumetric heat of combustion of natural gas in 1,5-2 times;

on closing of the electromagnetic valve 13, which connects the collector 12 prechamber gas tank 8 containing natural gas;

- at the opening of the electromagnetic valve 7 for supplying the collector 6 of the natural gas from the tank 8 by closing the electromagnetic valve 9, or by opening the electromagnetic valve 9 for feeding into the reservoir 6 from the container 10 with gas volumetric heat of combustion greater than the volumetric heat of combustion of natural gas in 1,5-2 times, when closing the electromagnetic valve 7.

The gas from the tank 10 serves in forgame the s 11 under pressure and perform spark ignition enrolled in the pre-chamber 11 of the gas. Torches of flame from the precombustion chambers 11 are received in the combustion chamber 4 cylinder engine and carry out the ignition of the gas mixture, the combustion pressure in the cylinders of the engine produces work to increase the frequency of rotation of the crankshaft 3. Higher volumetric heat of combustion gas supplied from the tank 10 into the pre-chamber 11 and (or) in the combustion chamber 4 of the cylinder compared to the volumetric heat of combustion of natural gas from the tank 8, provides a significant increase in combustion pressure in the cylinders of the engine 1 and, respectively, the acceleration of the process of increasing the frequency of rotation of the crankshaft 3 of the engine 1 until a steady frequency of rotation of idling before starting the engine 1.

With increasing rotational speed of the crankshaft 3 to the level of steady-state rotation frequency of idling of the engine 1 tachometer 16 transmits a corresponding signal to the automated remote control 15, which is in accordance with the control algorithm moves the motor to the supply of natural gas from the tank 8, which automatically opens the electromagnetic valves 7 and 13 for the supply of natural gas, respectively, in the manifold 6 cylinder gas and the manifold 12 prechamber gas and closes the solenoid valves 9 and 14, rasamma collectors 6 and 12 of the engine 1 with a capacity of 10 containing fuel gas with high the lines of the heat of combustion, what can conserve the gas.

Flow in the pre-chamber 11 during engine start fuel gas (such as propane with volumetric heat of combustion 84940 kJ/m3according to GOST 31369-2008), with a volumetric heat of combustion in excess of more than 2 times the volumetric heat of combustion of natural gas (equal 31800 kJ/m3according to GOST 27577-2000), increases the power consumed in the process of starting to increase the speed of the crankshaft of the engine, and accordingly, reduces the duration of the starting of the engine and increases the reliability of the run. Instead of gas with high volumetric heat of combustion for submission to the pre-chamber and the combustion chamber of the cylinder during engine start may be used a pair of flammable liquids. When starting the gas engine fuel gas with high volumetric heat of combustion shall be made part of the cylinder multi-cylinder gas engine.

1. Method of starting a gas engine that uses as its primary fuel natural gas, including natural gas supply to the cylinders and the pre-chamber cylinder, spark ignition of the gas in the precombustion chambers, the flow of combustion products of gas from the precombustion chambers in the combustion chamber of the cylinders of the engine, wherein when starting the gas engine in the period from the beginning of rotation of the crankshaft by the starter to o the Yes on a stable idling speed in the pre-chamber engine cylinder or cylinders of the gas engine serves a fuel gas with a volumetric heat of combustion, exceeding the volumetric heat of combustion of natural gas in 1,5-2 times.

2. Method of starting a gas engine according to claim 1, characterized in that when you start the gas engine, the fuel gas is fed into the part of the cylinder multi-cylinder gas engine.



 

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