JPH0127332B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing clogging of burners in an apparatus equipped with a plurality of burners.

In a combustion apparatus using a plurality of burners, in the case of partial load operation, some of the burners are provided with a stop period, and during that period, fuel is not injected from the nozzle, and only the remaining burners are allowed to burn. When such partial load operation time becomes longer, the unburned oil attached around the nozzle hole or the light content of the fuel oil contained inside evaporates in the nozzle of the burner during the stop period, resulting in high viscosity. Residues may form and clog the nozzle holes. If you try to inject again under these conditions, good atomization will be hindered, or worse, you may not be able to inject at all, or only the air conditioning damper that is linked to the injection amount will operate, resulting in an excessive amount of air, resulting in incomplete injection. This is dangerous as it may cause combustion or flame blow-out phenomenon, leading to an explosion within the furnace. There were drawbacks such as:

The present invention eliminates the above-mentioned drawbacks of the conventional methods and provides a method for preventing clogging of a burner nozzle by a simple method to prevent clogging of a burner nozzle during a stop period and to ensure good spray operation at all times. The purpose is to

The present invention provides a method for preventing clogging of burners equipped with a plurality of burners, in which during the combustion operation of some burners, the nozzles of other burners are temporarily stopped at preset time intervals. This is a method for preventing clogging of a burner nozzle, which is characterized by injecting fuel into the burner nozzle.

Embodiments of the present invention will be described with reference to the drawings.

The figure shows an example in which combustion is carried out in a combustion furnace 5 by the nozzles 3 and 4 of two burners 1 and 2, where 6 is a fuel pump, 7 and 8 are fuel supply valves, 9 is an air conditioning damper, and 10 is a blower. be.

Although not shown in the drawings, an ignition device is provided corresponding to the burner 1.

For example, in the case of a boiler burner, the burners 1 and 2 are generally controlled on and off by detecting fluctuations in the steam pressure or temperature of the boiler, and at the same time, the combustion air is also controlled in conjunction.

At full load, both burners 1 and 2 are operated, but at partial load, for example, burner 2 is stopped and only burner 1 performs combustion. At this time, the nozzle 4 of the burner 2 during the stop period receives heat from the flame of the burner 1 and is exposed to a considerably high temperature. If this condition continues for a long time,
Although the burner 2 is in a stopped period, the nozzle 4 is temporarily turned on at predetermined time intervals by another operation signal.
Fuel is injected from. Since a certain length of time is required for the light portion of the fuel adhering to or remaining inside the nozzle 4 to be heated and evaporated, the above-mentioned predetermined time interval is selected to be shorter than the time required for this evaporation. . By injecting fuel from the nozzle 4 at the time intervals selected in this way, the light components of the fuel adhering to the inside and outside of the nozzle 4 will completely evaporate, and the new fuel will be removed before the highly viscous residue adheres. Since it is replaced by fuel, there is no risk of clogging of the nozzle 4.

During this temporary fuel injection, the air conditioning damper 9
Although it is preferable that the air conditioning damper 9 be operated in conjunction with each other, since the injection may be performed for an extremely short period of time, the air conditioning damper 9 does not need to be operated.

Another method is to inject fuel from burner 2 if it is detected that burner 1 continues to operate for a long time and burner 2 has stopped for a predetermined period of time, and after ignition, burner 1 It is also possible to stop the operation.

The present invention provides that during the combustion operation by some burners,
Preventing burner nozzles from becoming clogged with fuel residue by a simple method by temporarily injecting fuel from the burner nozzles at preset time intervals during other outage periods; It is possible to provide a method for preventing clogging of a burner nozzle, which can improve fuel atomization, prevent incomplete combustion and flame blowout, and prevent danger, and can have extremely great practical effects. can.

[Brief explanation of drawings]

The drawing is a flow diagram illustrating an embodiment of the invention. 1, 2... Burner, 3, 4... Nozzle, 5...
Combustion furnace, 6... fuel pump, 7, 8... fuel supply valve, 9... air conditioning damper, 10... blower.

Claims (1)

[Claims] 1. In a method for preventing clogging of a burner provided with a plurality of burners, during the combustion operation of some of the burners, the nozzle of the other burners during the stop period is fired at a preset time interval. A method for preventing clogging of a burner nozzle, characterized by temporarily injecting fuel into the burner nozzle. 2. The method for preventing clogging of a burner nozzle according to claim 1, wherein the temporary supply operation of the stop nozzle causes an air adjustment damper for supplying combustion air to be linked.