JPH07293814A - Ignition device for flameless catalyst combustion apparatus - Google Patents

Abstract

PURPOSE:To eliminate an unstable combustion state at the time of combustion by a method wherein there is provided an ignition control means for injecting main fuel from a main fuel port after an increased temperature of main catalyst up to a flameless combustion temperature is detected by a temperature sensing means. CONSTITUTION:An electrical heating catalyst 4 to be electrically heated through an electrical energization is arranged in front of a major catalyst 1. In addition, main fuel ports 3 are positioned at a front part of the major catalyst 1 and at a rear part of a the electrical heating catalyst 4. An injection timing of mixed gas injected from the main fuel port 3 is controlled by a controller 9 acting as an ignition control means through a fuel control valve 11. That is, an electrical power is supplied to the electrical heating catalyst 4 by turning-on the ignition switch 5 and the electrical power supplying is shut off by turning-off the ignition switch 5. The turning-on and turning-off of the ignition switch 5 are controlled by the controller 9. With such an arrangement as above, it is possible to eliminate an unstable combustion state at the time of ignition and to prevent air pollution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flameless catalytic combustor igniter applied as an igniter for boilers, stoves and the like.

[0002]

2. Description of the Related Art An example of a conventional flameless catalytic combustor ignition device is shown in FIG. In the figure, 2 is a spare burner, in which a fuel port 3 is arranged behind the spare burner 2 and a main catalyst 1 is arranged further behind. In the flameless catalytic combustor igniter having such a structure, first, the auxiliary burner 2 is ignited to ignite the main catalyst 1
To raise its temperature. Then, when the temperature of the main catalyst 1 becomes sufficiently high and the main catalyst 1 becomes in an active state in which the fuel is burned without flame, a mixed gas of air and fuel gas is injected from the fuel port 3 and the mixed gas is ignited. . Unreacted fuel and nitrogen oxides (NOx) in the combustion exhaust gas generated when this mixed gas is burned are removed by the main catalyst 1 and, after working, are released to the atmosphere as purified combustion exhaust gas. To be done.

[0003]

However, in the above-mentioned conventional flameless catalytic combustor igniter, the main catalyst 1 is used.
The auxiliary burner 2 is in a combustion state which is a concern at the time of ignition until the temperature becomes sufficiently high to become the active state, and unreacted fuel and nitrogen oxides in the combustion exhaust gas injected from the auxiliary burner 2 However, combustion exhaust gas containing such substances is released into the atmosphere and pollutes the atmosphere.

The present invention has been made in consideration of the above circumstances, and an object thereof is to provide a flameless catalytic combustor ignition device capable of eliminating an unstable combustion state at the time of ignition to prevent atmospheric pollution. To provide.

[0005]

To achieve the above object, the present invention provides a main fuel port for injecting a main fuel; a main catalyst for burning the main fuel in a flameless manner; and a temperature detecting means for the main catalyst. An ignition auxiliary fuel port for injecting an auxiliary fuel; an electrothermal catalyst for heating the main catalyst with combustion exhaust heat of flameless combustion of the auxiliary fuel; an ignition switch for controlling a heating operation of the electrothermal catalyst; When the ignition switch is turned on to energize the electrothermal catalyst to heat the electrothermal catalyst to a flameless combustion temperature, the auxiliary fuel is injected from the auxiliary fuel port for ignition to heat the main catalyst with the heat of combustion exhaust. After detecting by the temperature detecting means that the main catalyst has risen to a flameless combustion temperature,
Ignition control means for injecting main fuel from the main fuel port;
It was configured with.

[0006]

In the flameless catalytic combustor igniter according to the present invention, the ignition control means supplies electric power to the electrothermal catalyst by the operation of turning on the ignition switch, and after the electrothermal catalyst rises to the flameless combustion temperature, the auxiliary fuel for ignition. A mixed gas of air and fuel gas is injected from the mouth toward the electrothermal catalyst. The temperature detection means detects the temperature of the main catalyst after the injection of the mixed gas from the auxiliary fuel port for ignition is started, and sends it to the ignition control means as a temperature signal. The ignition control means injects the mixed gas from the main fuel port when the temperature indicated by the temperature signal reaches a predetermined value. As a result, combustion is stabilized by heating the electrothermal catalyst even during ignition, unreacted fuel and nitrogen oxides are removed, and air pollution is prevented. Further, since the ignition control means controls the injection timing of the mixed gas from the main fuel port according to the temperature of the main catalyst, it becomes easy to control the injection of the mixed gas at the optimum temperature and further reduce the air pollution. You can

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the flameless catalytic combustor ignition device according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the present invention, in which reference numeral 1 denotes a main catalyst heated by combustion exhaust heat generated by combustion of a mixed gas of air and fuel gas injected from a main fuel port 3. In front of the main catalyst 1, an electrothermal catalyst 4 which is electrically heated by energization is arranged. The main fuel port 3 is located in front of the main catalyst 1 and behind the electrothermal catalyst 4, and the injection timing of the mixed gas from the main fuel port 3 is controlled via the fuel control valve 11 as a controller as ignition control means. Controlled by 9.

Power is supplied to the electrothermal catalyst 4 from a power supply device 6 via an ignition switch 5. That is, when the ignition switch 5 is turned on, electric power is supplied to the electrothermal catalyst 4, and when turned off, the electric power supply is cut off. The ignition switch 5 is turned on and off by the controller 9.
The power supply device 6 may be AC or DC.

Reference numeral 7 is an auxiliary fuel port for ignition for injecting a mixed gas of air and fuel gas (hereinafter, simply referred to as mixed gas) at the time of ignition, and the mixed gas injection timing is controlled by a controller 9 via a fuel control valve 8. Controlled by. That is, the opening timing of the fuel control valve 8 is controlled by the timer (not shown) of the controller 9. As can be seen from FIG. 1, the auxiliary fuel port 7 for ignition is located in front of the electrothermal catalyst 4.

Reference numeral 10 denotes a thermometer as a temperature detecting means, which detects the temperature of the main catalyst 1 and sends a temperature signal indicating the temperature to the controller 9.

Next, the operation of this apparatus will be described with the passage of time. First, the controller 9 turns on the ignition switch 5 to start supplying electric power to the electrothermal catalyst 4. After a lapse of a predetermined time from the start of the power supply, the auxiliary ignition fuel port 7 injects the mixed gas toward the electrothermal catalyst 4 via the fuel control valve 8 according to a command from the controller 9.

After the injection of the mixed gas from the auxiliary fuel port 7 for ignition is started, the controller 9 takes in a temperature signal from the thermometer 10 and monitors the temperature of the main catalyst 1. When the temperature of the main catalyst 1 reaches a predetermined value, the controller 9 opens the fuel control valve 11 to inject the mixed gas from the main fuel port 3.

Next, an experimental example of this apparatus will be described using specific numerical values. Here, the capacity of the main catalyst 1 of this apparatus is 2 liters, and the capacity of the electrothermal catalyst 4 is 200 milliliters.
The controller 9 turns on the ignition switch 5 to supply electric power of 10 V and 200 A to the electrothermal catalyst 4, and 30 seconds after the start of the electric power supply, the auxiliary fuel port for ignition 7 mixes 300 liters of air and 24 g of propane in 1 minute. Gas was injected. The temperature of the electrothermal catalyst 4 reached 400 ° C. 30 seconds after the start of power supply. When 80 seconds have elapsed after the start of the injection of the mixed gas from the auxiliary fuel port 7 for ignition,
The main catalyst 1 reached a predetermined value of 500 ° C. Controller 9
After detecting the temperature, the mixed gas having the above ratio was injected from the main fuel port 3 at a rate of 80 kiloliters per hour. This confirmed that the oxidation continued stably.

Next, the effect of the embodiment will be described. Since the auxiliary fuel for heating the main catalyst 1 is burned by the electrothermal catalyst 4 after the temperature is raised by electric heat to a temperature at which the auxiliary fuel is burnt without flame, stable combustion is performed immediately from the time of injection of the auxiliary fuel. You can Therefore, the emission of unreacted fuel and nitrogen oxides can be reduced even during ignition, and air pollution can be prevented. Further, in the main catalyst 1, since the heating temperature is measured by the thermometer 10 and the injection timing of the mixed gas from the main fuel port 3 is measured, the mixed gas can be injected at the optimum temperature to further reduce the air pollution. it can. In this case, it is necessary to set the temperature to 800 ° C. or lower in order to suppress the production of nitrogen oxides.
With 0, ignition can always be performed at the temperature set to the optimum value.

The embodiments of the present invention have been described above.
The specific configuration of the present invention is not limited to this embodiment, and any design change within the scope of the present invention is included in the present invention.

For example, in the embodiment, the injection timing of the sub fuel is supposed to be set on the basis of the lapse of a predetermined time by the setting of the timer, but the present invention is not limited to this, and a thermometer or the like is provided in the electrothermal catalyst 4, The injection timing may be set when the predetermined temperature is reached.

[0017]

As described in detail above, since the flameless catalytic combustor ignition device according to the present invention has the above-described structure, the auxiliary fuel that heats the main catalyst is burned even after ignition after heating the electrothermal catalyst. By doing so, combustion becomes stable and the release of unreacted fuel and nitrogen oxides is reduced,
Air pollution can be prevented. Further, since the ignition control means controls the injection timing of the main fuel from the main fuel port according to the temperature of the main catalyst, it becomes easy to control the injection of the mixed gas at the optimum temperature and further reduce the air pollution. You can

[Brief description of drawings]

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

FIG. 2 is a configuration diagram showing a conventional flameless catalytic combustor ignition device.

[Explanation of symbols]

 1 Main Catalyst 3 Main Fuel Port 4 Electrothermal Catalyst 5 Ignition Switch 6 Power Supply Device 7 Ignition Sub Fuel Port 8, 11 Fuel Control Valve (Ignition Control Means) 9 Controller (Ignition Control Means) 10 Thermometer

Claims (1)

[Claims] 1. A main fuel port for injecting a main fuel; a main catalyst for burning the main fuel in a flameless manner; a temperature detecting means for the main catalyst; a sub fuel port for ignition for injecting a sub fuel; An electrothermal catalyst that heats the main catalyst with combustion exhaust heat of flameless combustion of fuel; an ignition switch that controls the heating operation of the electrothermal catalyst; Is heated to a flameless combustion temperature, then auxiliary fuel is injected from the auxiliary fuel port for ignition to heat the main catalyst with heat of combustion exhaust, and the main catalyst is heated to a flameless combustion temperature. After detecting with the temperature detecting means,
Ignition control means for injecting main fuel from the main fuel port;
A flameless catalytic combustor igniter comprising: