JPS5862424A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To prevent the sudden ignition and explosion in a fuel injector by supplying an incombustible gas first when fuel injection is started by means of the fuel injector. CONSTITUTION:When starting combustion, currents flow through an ignition switch from a starting switch 29, and flow through an incombustible-gas interrupting valve 17 through a diode 32 to open the valve 17, and backward flowing into the fuel injector 3 of combustion gas or gas not burnt from a combustion chamber 1 through the flowing of the incombustible gas through the fuel injector 3 is prevented. When stopping combustion, the currents of a power supply 30 flow through an incombustible-gas interrupting valve 15 through the starting switch 29 to open the valve 15, and the inside of the fuel injector 2 is scavenged by the incombustible gas. Accordingly, the ignition and explosion of fuel in the fuel injector are prevented, and safety can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger for a combustion device that generates high-temperature, high-pressure gas, and particularly to the structure and arrangement of an injector and a control device suitable for preventing the sudden onset of induced combustion. It is.

The entire system of a conventional combustion device will be explained with reference to FIGS. 1 and 2. In Figure 1, 1 is a combustion chamber with a fuel injector 2 at one end.
, 3, and the other end is opened to the atmosphere TFC through a nozzle 4 into a vacuum. 5 is a spark plug for ignition. The fuel injectors 2 and 3 are connected to a fuel tank 10 and an oxidizer tank 1 via fuel cutoff valves 6.7 and oxidizer quick cutoff valves 8 and 9.
Piping is connected to tank 10. 11 is pressurized by high-pressure nonflammable gas from a nonflammable gas tank 12, and supply pressure for spraying and atomizing the fuel and oxidizer is applied. 13 is a start switch that supplies fuel and oxidizer to the fuel injector 2, and 14 is a start switch that supplies fuel and oxidizer to the fuel injector 3. In order to prevent explosive combustion from starting at the time of starting, the start switches 13 and 14 are turned on at intervals of time. In this conventional device, when the start switch 13 is turned on and the fuel injector 2 starts combustion, the pressure inside the combustion chamber 1 rises and the combustion gas or unburned gas is still injected. 6. There is a drawback that there is a risk that the fuel flowing back into the fuel injector 3 that has not started and remaining inside may cause an ignition explosion. Ta.

FIG. 2 shows another conventional method for preventing the above-mentioned drawbacks. That is, a nonflammable gas quick cut valve 15.1 is provided between the fuel injector 2, the fuel cutoff valve 6, and the oxidizer cutoff valve 8, respectively.
6 is interposed, and a pipe from the nonflammable gas tank 12 is connected to the nonflammable gas cutoff valve 17.6, and a nonflammable gas cutoff valve 17.
Connect piping from the nonflammable gas tank 12 through the inflammable gas tank 18, turn on the scavenging switch 19 before turning on the starter switch 3 and 14, and use the nonflammable gas to remove the remaining fuel in the fuel injector 2. Scavenge residual oxidizer.

In this conventional device, the starting switch 13 is reversed into the interior of the fuel injector 3 which has not started injection. At this time, the inside of the υ fuel injector 3 is scavenged, which is different from the case in Figure 1, so the risk of ignition and explosion inside the fuel injector 3 is lower than in the case in Figure 1. If there is a slight leak in the fuel cutoff valve 7 and oxidizer cutoff valve 9, or if there is no leakage but combustion gas or unburned gas is flowing back into the fuel injector 3, turn on the start switch 14. There is a drawback that when the fuel injector 3 starts injecting multiple fuel, there is a possibility that an ignition explosion may occur within the fuel injector 3.

An object of the present invention is to provide a combustion device that prevents ignition and explosion within the fuel injectors when a plurality of fuel injectors sequentially start injection in order to prevent the start of explosive combustion.

In a combustion apparatus having a plurality of fuel injectors, the present invention provides a method for injecting fuel into a fuel injector when some of the fuel injectors start injecting fuel in advance of others. The unique feature is that the gas is supplied and this is maintained until the time of fuel injection.

An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 designates a combustion chamber, which is provided with fuel injections N2 and 3 at one end, and is connected from the fuel injector 2 to a combustion gas cutoff valve 15 through a piping B and to a combustion gas cutoff valve 15 through a piping B. Further, the pipe n is connected to an oxidizing agent cutoff valve 8 (not shown) and a nonflammable gas quick cutoff valve 16 (not shown) for 1% oxidizing agent i.

From the other fuel injector 3 to the piping phantom fuel cutoff valve 7,
The piping is connected to the cine flammable gas cutoff valve 17.

Further, the pipe 5 is connected to an oxidant cutoff valve 9 (not shown) and an oxidant scavenging nonflammable gas cutoff valve 18 (not shown). The fuel cutoff valves 6 and 7tJ are connected to the multi-fuel tank 10 (not shown) through piping, and the nonflammable gas connection valves 15 and 17 are connected to the combustible gas tank 12 (not shown) through piping 27 and 211, respectively. (not shown).

The switch is the starting switch, and the tR3 diagram shows the light state when it is switched to the Ah operating position, and the current from the power source passes through the fuel quick-cut valve 6 to open it, and the fuel flows to the fuel injector 2 (as shown by the dotted line in the pipe). (showing the flow) combustion starts. At the same time, the current flows from the starting switch 4 to the fire switch 31, passes through the diode ℃ to the nonflammable gas cutoff valve 17 to open it, and nonflammable gas flows to the fuel injector 3 ( This prevents combustion gas or unburned gas from flowing back into the fuel injector 3 from the combustion chamber 1 (the flow is indicated by a dotted line inside the tube). The diode blades prevent current from flowing backwards from the output side of the ignition switch 31 to the nonflammable gas cutoff valve 15 and opening it.

When combustion starts under the following conditions, the ignition switch 31 is switched to the opposite side (referred to as the ignition position) as shown in the figure (either by the activation of the ignition detector or manually), and the current from the power source (support) is opens the fuel shutoff valve 7, allowing fuel to flow to the fuel injector 3 and begin combustion. At this time, the current to the nonflammable gas cutoff valve 17 is simultaneously cut off by the ignition switch 31, and the supply of nonflammable gas to the fuel injector 3 is stopped.

Next, to explain the operation of the turtle when combustion is stopped, when the start switch 2 is switched from the above state (full combustion state) to the side opposite to that shown in the figure (referred to as the stop position), the fuel cutoff valve 6 is connected from the power source to the fuel cutoff valve 6. The current flowing to the fuel shutoff valve 6 via the ignition switch 31 and the current flowing to the fuel shutoff valve 6 are interrupted.
．． 7 is shut off, combustion by fuel injector 2.3 is stopped,
At the same time, the current from the power source (9) passes through the starting switch to open the nonflammable gas cutoff valve 15, thereby scavenging the inside of the fuel injector 2 with nonflammable gas. At the same time, the current also passes through the diode to the nonflammable gas cutoff valve 17 to open the valve and scavenge the inside of the fuel injector 3 with nonflammable gas to prevent combustion within the injector due to backfire.

When combustion stops, the ignition switch 3I returns to the illustrated state (referred to as the extinguishing position), but the ignition switch 31 has already been cut off from the power supply by the start switch 4 and has no effect. The diode prevents current from flowing backwards from the output side of the starting switch 4 to the fuel cutoff valve 6 and opening it.

According to this embodiment, there is an effect of preventing backflow of combustion gas or unburned gas from the combustion chamber into the fuel injector to which fuel is not being supplied.

According to the present invention, at the start of combustion and during water stoppage, combustion gas or unburned gas in the combustion chamber does not flow backward into the fuel injection valve to which fuel is not being supplied, so that fuel remains in the fuel injector. If there is a leak in the fuel cutoff valve or if you try to start fuel injection during combustion, the fuel will not ignite and explode in the fuel injector.
It has the effect of being safe.

[Brief explanation of the drawing]

1 and 2 are overall system diagrams of a conventional combustion apparatus, and FIG. 3 is a partial system diagram showing an embodiment of the combustion apparatus of the present invention. ■... Combustion chamber, 2, 3... Fuel injector, 6. 7...Fuel cutoff valve, 15.17...
・・Nonflammable gas cutoff valve, 4・・・・Start switch,
31...Ignition switch, 32° wing...
Diode, ah... Ignition detector agent Patent attorney Usui 1) Yuki Toshi

Claims (1)

[Claims] 1. In a combustion device having multiple fuel injectors, each fuel injector is provided with a fuel cutoff valve, and a nonflammable gas supply pipe connected to a nonflammable gas cutoff valve is installed between the nuclear fuel rapid cutoff valve and the fuel injector. and at the same time when starting combustion, open the fuel cutoff valves provided in some of the fuel injectors of the plurality of fuel injectors and keep the fuel cutoff valves provided in the other fuel injectors closed, so that the fuel injection Connect the start switch and wiring to open the nonflammable gas cutoff valve connected to the fuel injector to scavenge the fuel remaining in the fuel injector, detect ignition combustion, and shut off the other fuel injector. A combustion device characterized in that an ignition switch and wiring are connected so as to open a fuel cutoff valve and simultaneously close a nonflammable gas cutoff valve connected to the fuel injector.