JPS6062509A - Method of ignition for burner - Google Patents

Abstract

PURPOSE:To prevent a trouble that may be caused by a delay or a failure of ignition, by igniting a burner with a small rate of air without using any air supplier such as a damper. CONSTITUTION:A timer 3 is started at the same time when a fan 2 is operated. The number of revolution of a fan 2 is increased to come up to the rated number, and a prepurging operation is performed by the fan 2 before a burner is ignited. After sufficient prepurging, the contact point 4 of a timer is opened, and the number of revolution is decreased. At this time, the contact point 5 of a timer is closed and an ignition transformer 6 is energized. Then the contact point 7 of a timer is closed to energize a fuel valve 8 which injects fuel to the burner. An ignition detecting cell 9 detects ignition and a flame detecting relay 10 is energized, the contact point 11 is closed and the number of revolution of a fan is increased again to come up to the rated number, so that the flow rate of air is increased to move the burner to complete combustion. With such an arrangement, a trouble caused by a delay or a failure of ignition can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of igniting a burner.

Conventionally, J
5, a method is usually used in which a forced air blower is used to promote mixing of fuel and air by applying violent turbulence to the flame generating section with ν. In this case, in order to achieve sufficient mixing, it is necessary to increase the wind speed in this part.

On the other hand, when starting the burner, the difficulty of ignition is greatly influenced by the air flow velocity in the flame generation section.If the air flow velocity is slow, smooth and stable ignition will be achieved, but the faster the air flow velocity, the worse the ignition performance will be. Become. This is because in a high-speed airflow, a weak flame at the initial stage of 19 JkL tends to blow out, causing an ignition delay or, in extreme cases, a non-ignition phenomenon.

In order to eliminate this drawback, in the past, for example, the amount of air was restricted by a damper installed at the 111 output [J or suction 1] of the ignition 11; Measures are being taken to increase it.

However, this method requires a damper, complicates the structure, requires maintenance, and increases the size of the device, especially for large-capacity devices.

Furthermore, in small-sized devices, in order to simplify control, it is common to perform on/off control of the blower and fuel supply. In other words, it is normal to first supply a rated amount of air and then to ignite the rated amount of fuel. There was also the risk of an explosion within the reactor due to an increase in fuel consumption or an ignition error.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional method, perform ignition with a small air volume without using equipment such as a damper, and prevent troubles and dangers caused by ignition delays and ignition errors. be.

The present invention provides the following (1\), (13) burner ignition method in which fuel is combusted by supplying combustion air with a blower.
A burner ignition method characterized in that ignition is performed through the operations of ) and (C).

(A) In an unlit state, increase the rotation speed of the blower up to the rated value and perform pre-purging, (B) Next, reduce the rotation speed of the blower WL to a predetermined low speed value and perform low speed rotation. (C) The number of revolutions of the blower is then increased to the rated number of revolutions. ] It is.

The present invention will be explained with reference to FIG. 1 and FIG. 2 by way of example.

Closing a switch 1 activated by pressure or temperature activates a blower 2 and simultaneously activates a timer 3. The blower 2 increases its rotation speed from point 0 to point a in FIG. 2, reaches its rated rotation speed, and performs pre-purge in an unignited state. After enough pre-parts, timer contact 4 opens and blows air at point b (
Since the power supply is turned off, the rotational speed decreases to b-+c. At this time, the timer contact 5 is closed, and the ignition transformer 6 is activated (=1).Then, the timer contact 7 is closed, the fuel valve 8 is activated, and fuel is injected.The ignition is controlled by the flame detection cell 9.
is detected and the flame detection relay 10 is energized, so the contact 11 is closed and the blower 2 increases its rotation speed again to increase the flow velocity and d
The engine reaches its rated speed and complete combustion begins. At the same time, the contact 10' is opened and the ignition transformer 6 is stopped. If the timer contact 7 is closed and does not ignite, after a certain period of time has elapsed since the timer 12 started, the contact 13 will close and the auxiliary relay 14 will be activated (=1. In other words, the contact 15.1
6, the pilot lamp 17 is lit and the power to the combustion circuit is cut off.

e indicates the late limit of possible ignition time and ce indicates the ignition chance period.

In this way, the rotation of the blower 2 is temporarily increased to the rated rotation speed in order to sufficiently purify the air in the furnace before ignition. At the time of ignition, the rotational speed is lowered to lower the air volume, and after ignition, the rotational speed is returned to the rated speed.

When changing the number of times, electrical control may be used. As mentioned above, when turning off the power and reducing the rotation speed to a low level of 1.5 seconds, no particularly complicated control equipment is required; just set 4-1.
1 becomes extremely easy.

The present invention provides a method for igniting a burner that is smooth and safe by igniting a burner with a small air volume by a simple means without using any equipment such as a damper, preventing troubles and dangers caused by ignition delays or ignition errors. , and has an extremely large practical effect.

[Brief explanation of the drawing]

FIG. 1 is a sequence circuit diagram of an embodiment of the present invention, and FIG. 2 is a graph showing its operating status. 1...Switch, 2...Forward X1fi, 3...Timer,
4, 5...Timer contact, 6...Ignition transformer, 7...
Timer contact, 8...Fuel valve, 9...Flame detection cell, 10
...Flame detection relay, 10', I+...Contact, 12...Timer, 13...Contact, 14...Auxiliary relay, 15.1
6...Contact, 17...Pilot lamp. Special J'F applicant Patent attorney representing Ebara Corporation
Masaru Takagi Rows 1,000-1-11 Twisting Takao Maruyama

Claims (1)

[Claims] 1. A method for igniting a burner in which fuel is combusted by supplying combustion air using a blower, which includes the following (A) and (B).
A method for igniting a burner, characterized in that ignition is performed through the operations of (C) and (C). (l\) In the unignited state, increase the rotation speed of the blower to the rated value by 1. After closing step 1, perform pre-purge, (13) then i! 'J' Set the rotational speed of the 51L blasting rock to a constant low speed value of 1ili and make it rotate at low speed, and during the period of low speed rotation, start the supply of fuel and ignite, ((,) Next, write 111j. The number of rotations of the blowing rock is set to the number of rotations of the runway by 1>1u.