JP4146591B2 - Water supply control device for nozzle tip water mixing type liquid burner - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a water supply control device in a nozzle tip water mixing type liquid burner.
[0002]
[Prior art]
There is a nozzle tip water mixing type liquid burner in which water injection holes are provided in the nozzle tip part, water and fuel oil are mixed at the nozzle tip, and the water mixed fuel immediately after mixing is sprayed and burned. Since the burner mixes water with the fuel oil just before combustion, there is no need to maintain the mixing state for a long time as in the case of emulsion fuel, and there is no need to add an emulsifier to the fuel oil or mix it with a dedicated mixer. The NOx reduction effect equivalent to the emulsion fuel can be obtained with a simple device.
[0003]
In the case of combustion with an emulsion fuel, a mixed oil obtained by mixing fuel oil and water in advance with a mixer is supplied to a burner, and emulsification is an independent control regardless of the implementation of combustion. However, in the case of water mixing at the nozzle tip, fuel oil and water are individually supplied to the nozzle tip and injected immediately after mixing. Various problems arise if fuel oil and water are not supplied only when necessary. Will occur. If the supply of fuel oil is stopped when the fuel oil supply is stopped due to a fire or the like during combustion, only water is injected into the furnace, and the water staying in the furnace is not ignited in the subsequent combustion process. May cause poor combustion. Further, if water is supplied before the start of combustion or when the flame is not stable, combustion failure such as non-ignition or vibration combustion may occur.
[0004]
[Problems to be solved by the invention]
The subject of this invention is preventing generation | occurrence | production of the problem that non-ignition and combustion failure generate | occur | produce in the nozzle tip water mixing type liquid burner.
[0005]
[Means for Solving the Problems]
Hydraulic spray type burner that mixes fuel oil and water at the nozzle tip and sprays and burns the water-mixed fuel immediately after mixing, water supply pump for supplying water to the burner, and water that controls water supply to the burner Nozzle tip water provided with a supply control valve, a fuel supply pump for supplying fuel oil to the burner, a fuel supply control valve for controlling fuel oil supply to the burner, and a flame detector for detecting the presence or absence of flame in the burner In the mixed liquid burner, connect to each auxiliary machine . 1. Operate the fuel supply pump . 2. Open the fuel supply control valve . Flame detector detects the presence of a flame, open only water supply control valve when the signal is input that, when any of the signals described above is not input, performs closing control of water supply control valve.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a burner portion of a boiler embodying the present invention, and FIG. 2 is a time chart of water supply control and the like in one embodiment of the present invention.
[0007]
The burner 2 injects water into the fuel oil, mixes the water and the fuel oil, sprays the water-mixed fuel, the water supply pump 3 for supplying water to the burner, and controls the water supply to the burner A water supply control valve 4 that supplies fuel oil to the burner, a fuel supply control valve 6 that controls the supply of fuel oil to the burner, a flame detector 8 that detects the presence or absence of flame in the burner, and ignition Ignition devices 9 that emit sparks are provided. And it connects with each auxiliary machine of water supply pump 3, water supply control valve 4, fuel supply pump 5, fuel supply control valve 6, flame detector 8, and ignition device 9, respectively. A controller 7 for receiving and transmitting a control signal to each device is provided.
[0008]
When starting the combustion of the burner, the controller 7 first operates the fuel supply pump 5 and the water supply pump 3 and causes the ignition device 9 to generate an ignition spark. The ignition spark is continued for a predetermined time, and the fuel supply control valve 6 is opened during that time. By opening the fuel supply control valve 6, fuel oil is sent to the nozzle 1, and the fuel oil injected from the nozzle 1 generates a flame by the ignition spark of the ignition device 9 and starts combustion. When combustion starts, the flame detector 8 detects the presence of a flame, and a signal with a flame is sent to the controller 7. At this point in time, the water supply control valve 4 is closed, so that no water is supplied to the nozzle 1.
[0009]
The controller 7 counts the elapsed time from the time when the flame presence signal is input from the flame detector 8 and outputs the water supply control valve 4 when the elapsed time reaches a predetermined time t. When the flame is not stable at the time of ignition or immediately after ignition, by not supplying water, combustion is performed only with fuel oil, so that no non-ignition or poor combustion does not occur. Even if water is supplied after the flame stabilization period has elapsed, no combustion failure occurs, and the amount of NOx generated can be reduced by supplying water.
[0010]
Water supply is performed when the fuel supply pump 5 is operated and the fuel supply control valve 6 is open. At this time, the controller 7 transmits a signal for operating the fuel supply pump and a signal for opening the fuel supply control valve . When the flame detector 8 detects a flame, a signal indicating the presence of a flame is sent to the controller 7. The controller 7 supplies water when the fuel supply pump operation, fuel supply control valve open, and flame signals are input. If any of the above signals is not input, the controller 7 controls the water supply control. The valve 4 is closed.
[0011]
For example, when the combustion is interrupted, the flame presence signal from the flame detector 8 is interrupted, and the controller 7 detects that the flame has disappeared. Then, the controller 7 outputs a closing signal to the water supply control valve 4 and stops supplying water to the nozzle 1. At the same time as the output to the water supply control valve 4, the controller 7 outputs a signal for closing the fuel supply control valve 6 and outputs a stop signal to the water supply pump 3 and the fuel supply pump 5. The supply of fuel oil to the nozzle 1 is also stopped.
[0012]
By controlling the water supply to the nozzle 1 as described above, when the fuel supply is stopped due to the occurrence of a halfway fire, only water is supplied and water is injected into the furnace. No accumulation occurs, and no non-ignition or defective combustion occurs in the subsequent combustion process.
[0013]
In the above-described embodiment, the control to open the water supply control valve 4 is performed assuming that the time when the predetermined time t has elapsed since the detection of the presence of flame at the time of ignition is the time when the flame stabilization period has elapsed. However, the water supply control valve 4 is opened under the condition that the fuel supply control valve 6 is opened, the fuel supply pump 5 is operated, the flame detector 8 detects the presence of flame, and the flame stabilization period has elapsed. Control other than that described above is also conceivable. For example, the fuel supply control valve 6 is opened, the fuel supply pump 5 is operated, and the presence of flame is detected, and when the ignition spark performed for a predetermined time is completed, the water supply control valve 4 is opened or a flame detector is detected. As long as the detection of presence of flame is started after the flame stabilization period has elapsed, control such as opening the water supply control valve 4 when the detection of presence of flame is started by the flame detector 8 may be performed. .
[0014]
【The invention's effect】
By practicing the present invention, in the nozzle tip water mixing type liquid burner, problems such as non-ignition at the time of ignition and combustion failure may be solved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a burner portion of a boiler embodying the present invention. FIG. 2 is a time chart of water supply control and the like in one embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Nozzle 2 Burner 3 Water supply pump 4 Water supply control valve 5 Fuel supply pump 6 Fuel supply control valve 7 Controller 8 Flame detector 9 Ignition device

Claims (2)

Hydraulic spray type burner that mixes fuel oil and water at the nozzle tip and sprays and burns the water-mixed fuel immediately after mixing, water supply pump for supplying water to the burner, and water that controls water supply to the burner Nozzle tip water provided with a supply control valve, a fuel supply pump for supplying fuel oil to the burner, a fuel supply control valve for controlling the supply of fuel oil to the burner, and a flame detector for detecting the presence or absence of a flame in the burner In the mixed liquid burner, connect it to each auxiliary machine . 1. Operate the fuel supply pump . 2. Open the fuel supply control valve . Flame detector detects the presence of a flame, open only water supply control valve when the signal is input that, when any of the signals described above is not input, to perform the closing control of the water supply control valve A water supply control device in a nozzle tip water mixing type liquid burner characterized by the above. In the water supply control device for a nozzle tip water mixing type liquid burner according to claim 1, in the case of ignition, the fuel supply pump is operated, the fuel supply control valve is opened, and the flame detector has a flame. A water supply control device in a nozzle tip water-mixing type liquid burner, which performs control to open a water supply control valve after the start of detection and after a flame stabilization period has elapsed.

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