JP4119587B2 - Air volume control device for water-mixing liquid burner at nozzle tip - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an air volume adjusting 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. In the case of a nozzle-end water-mixed liquid burner, water is mixed with the fuel just before combustion, so the amount of water injected can be easily adjusted, and combustion at the time of ignition or combustion transition is unstable. During this period, the combustion was stabilized by stopping or reducing the injection of water.
[0003]
In the case of a nozzle tip water mixing type liquid burner, the air supply amount is set so as to be an optimum amount in a normal state where water is mixed, and impurities such as smoke and CO are not generated during normal combustion. However, at the time of ignition or the transition to combustion when adjusting the amount of water injected, there is a possibility that unburned parts may be generated due to deviation from the optimal air supply amount, combustion failure or vibration combustion may occur There was a problem. In addition, water supply to the burner cannot be performed due to an abnormality in the water supply line, etc. When the water supply amount is reduced, unburned components such as smoke and CO are generated, combustion failure and vibration There was a problem that combustion may occur.
[0004]
[Problems to be solved by the invention]
An object of the present invention is that when a water injection amount fluctuates due to an ignition or a transition to combustion in a nozzle tip water mixing type liquid burner or an abnormality in the supply of water to the burner, a combustion failure or the like occurs. The problem is to solve the problem.
[0005]
[Means for Solving the Problems]
Hydraulic spray type burner that injects water into the fuel oil at the nozzle tip and sprays and burns the water-mixed fuel immediately after mixing, injection water amount adjustment device that adjusts the amount of water supplied to the burner, amount of combustion air supplied to the burner Each nozzle-end water-mixing liquid burner is equipped with an air supply amount adjustment device that adjusts the amount of water, and the amount of water injected into the fuel oil is changed by controlling the injection water amount adjustment device. The supply air amount adjusting device is controlled based on the amount of water to be adjusted, and the amount of combustion air supplied to the burner is adjusted.
[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, FIG. 2 is a relationship diagram between a water injection amount and a combustion amount, and FIG. 3 is a relationship between a water injection amount, an air supply amount of the present invention, and a conventional air supply amount. 4 and 4 are diagrams showing the relationship between the water injection amount, the air ratio in the present invention, and the conventional air ratio.
[0007]
The burner 2 injects water into the fuel oil, mixes the water and the fuel oil, sprays the water-mixed fuel, the injection water amount adjustment device 4 that adjusts the amount of water supplied to the burner, and the combustion for supply to the burner An air supply amount adjusting device 5 that adjusts the air amount, an oil amount adjusting device 6 that adjusts the amount of fuel oil supplied to the burner, an injected water detection sensor 3 such as a flow meter that detects the supply of water to the burner, and an injected water amount The controller 4 is connected to each of the adjustment device 4, the air supply amount adjustment device 5, the oil supply amount adjustment device 6, and the injected water detection sensor 3, and a controller 7 that controls each device is provided.
[0008]
The controller 7 closes the injected water amount adjusting device 4 at the time of ignition and supplies only fuel oil to the nozzle 1 by opening only the oil supply amount adjusting device 6, and also opens the injected water amount adjusting device 4 at normal combustion to open the fuel to the nozzle 1. Supply oil and water. Further, the controller 7 adjusts the amount of combustion air sent from the blower (not shown) to the burner 2 by adjusting the opening of the air supply amount adjusting device 5. The air supply amount is adjusted according to the fuel supply amount, but the controller 7 also changes the air supply amount depending on whether or not the injection water is supplied to the nozzle 1 or depending on the water injection amount.
[0009]
It has been confirmed that the relationship between the water injection amount and the combustion amount changes as shown in FIG. 2 even when the fuel supply pressure is constant. This is because the viscosity of the water-mixed fuel decreases due to the injection of water into the fuel oil, and the amount of fuel oil that passes through the nozzle increases even if the oil pressure is constant. When the injected water amount is set to a certain value or more, the absolute amount of the fuel oil in the water-mixed fuel is decreased, and as a result, the combustion amount is decreased, and the combustion amount is maximized when the predetermined water amount is reached.
[0010]
In the conventional case, the air supply amount to the burner is determined based on the oil supply amount, and is determined regardless of the water injection amount. Therefore, as shown as the conventional air supply amount in FIG. Is constant. In the case of a water mixing type liquid burner, the air supply amount is determined so that proper combustion can be performed when water mixing is being performed. In the case of a water mixing type liquid burner, in the region where the water injection amount is smaller than the maximum point of the combustion amount, if the water injection amount decreases as described above, even if the fuel supply pressure sent to the nozzle 1 is constant. The amount of combustion is reduced. Therefore, even if the optimum air ratio is set during normal combustion in which water is supplied, the amount of combustion decreases when water injection stops or decreases, so the conventional air shown in FIG. As shown as the ratio, the air ratio has increased, the air ratio has deviated, and abnormalities such as vibration combustion may occur.
[0011]
Therefore, as shown as the air supply amount of the present invention in FIG. 3, a necessary air supply amount is set according to the injection of water into the fuel oil, and the air supply amount is changed according to the water injection amount. . When increasing the amount of water injected into the fuel oil or decreasing the amount of water injected, increase the amount of combustion air supplied to the burner as the amount of injected water increases, and supply to the burner as the amount of injected water decreases By changing the supply air amount according to the water supply amount so as to reduce the combustion air amount, the air ratio can be changed even if the water injection amount changes as shown in FIG. 4 as the air ratio in the present invention. The optimum value can be maintained, and the occurrence of unburned components such as smoke and CO, fuel failure, and vibration combustion can be prevented.
[0012]
The controller 7 may determine that the injection of water into the nozzle 1 has been stopped by outputting a closing to the injection water amount adjusting device 4, and may change the air supply amount step by step depending on the presence or absence of the injection, An injection water detection sensor 3 is provided between the injection water amount adjusting device 4 and the nozzle 1, the injection of water into the nozzle 1 is detected by the output from the injection water detection sensor 3, and the air supply amount is stepwise according to the injection water amount. Changes may be made. Further, the amount of combustion can be calculated by detecting the amount of water injected by the injected water amount detection sensor 3, and the air ratio can be made constant by adjusting the supply air amount proportionally according to the calculated amount of combustion. it can.
[0013]
The present embodiment relates to the case where the water injection amount is controlled in a region where the water injection amount is smaller than the point where the combustion amount fluctuating depending on the water injection amount is maximized. When controlling the water injection amount even in the region where there is more than the maximum point, when the water injection amount decreases, the combustion amount increases up to the water amount at which the combustion amount becomes maximum, and when the water injection amount increases, the combustion amount decreases. In this case, too, if the air supply amount is constant, the appropriate air ratio is deviated. For this reason, in the region where the amount of water is less than the maximum point of the combustion amount that fluctuates according to the change in the amount of water injected into the fuel oil, the amount of combustion air supplied to the burner increases as the amount of injected water increases, The amount of combustion air supplied to the burner is reduced in accordance with the decrease, and in the region where the amount of water is larger than the maximum point, the amount of combustion air supplied to the burner is reduced in accordance with the increase in the amount of injected water, and the amount of injected water is reduced. By changing the supply air amount according to the water supply amount so as to increase the amount of combustion air supplied to the burner in accordance with the amount of water, the air ratio can be maintained at an optimum value even if the water injection amount changes. it can.
[0014]
In addition, since the amount of fuel oil that passes through the nozzle fluctuates due to fluctuations in the amount of water injected, the amount of water injected can be detected by measuring the amount of fuel oil supplied to the burner, and the amount of air supplied can be supplied as fuel oil. You may change according to quantity.
[0015]
【The invention's effect】
By implementing the present invention, it is possible to solve problems such as occurrence of defective combustion at the time of ignition or transition to combustion in the nozzle tip water mixing type liquid burner. Further, since the air supply amount is adjusted according to the amount of injected water, even when a water supply operation failure occurs, a predetermined air ratio can be maintained, and a stable combustion state can be maintained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a burner part of a boiler embodying the present invention. FIG. 2 is a relationship diagram between a water injection amount and a combustion amount. FIG. 3 is a graph showing a relationship between a water injection amount, an air supply amount of the present invention, and a conventional air supply amount. Relationship diagram [Fig. 4] Relationship between water injection amount, air ratio in the present invention, and conventional air ratio [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nozzle 2 Burner 3 Injection water detection sensor 4 Injection water amount adjusting device 5 Air supply amount adjusting device 6 Oil supply amount adjusting device 7 Controller

Claims (6)

Hydraulic spray type burner that injects water into fuel oil at the nozzle tip and sprays and burns the water-mixed fuel immediately after mixing, the amount of water supplied to the burner, or the amount of injected water that is adjusted proportionally The nozzle tip water is provided with a regulator and an air supply regulator that regulates the amount of combustion air supplied to the burner, and the amount of water injected into the fuel oil is changed by controlling the injection water regulator. In the mixed liquid burner, the nozzle tip water mixing type is characterized in that the amount of combustion air supplied to the burner is adjusted by controlling the air supply amount adjusting device based on the presence or absence of water injection into the fuel oil. Air volume control device in liquid burner. 2. The air volume adjusting device for a nozzle tip water mixing type liquid burner according to claim 1, wherein an injection water detection sensor such as a flow meter for detecting the supply of water to the burner is provided, An air volume adjusting device for a nozzle tip water mixing type liquid burner, characterized in that the amount of combustion air supplied to the burner is adjusted according to the amount of injected water detected by a water detection sensor. 3. The air flow rate adjusting device for a nozzle tip water mixing type liquid burner according to claim 1 or 2, wherein the fuel supply pressure to the burner is constant, and the water injection into the fuel oil is increased or decreased. A nozzle-end water-mixing type liquid that performs control to increase the amount of combustion air supplied to the burner in accordance with the increase in the amount of water and to decrease the amount of combustion air supplied to the burner in accordance with the decrease in the amount of injected water Air volume control device in the burner. 4. The air volume control device for a nozzle tip water mixing type liquid burner according to claim 3, wherein when the fuel supply pressure to the burner is constant and the amount of water injected into the fuel oil increases or decreases, the fuel is injected into the fuel oil. In the region where the amount of water is smaller than the maximum point of the combustion amount that fluctuates according to the change in the amount of water to be supplied, the amount of combustion air supplied to the burner is increased as the amount of injected water increases, and is supplied to the burner as the amount of injected water decreases In the region where the amount of combustion air is reduced and the amount of water is larger than the maximum point, the amount of combustion air supplied to the burner is reduced in accordance with the increase in the amount of injected water and supplied to the burner in accordance with the decrease in the amount of injected water. An air volume control device in a nozzle tip water mixing type liquid burner, characterized in that control for increasing the amount of combustion air is performed. 3. An air flow rate adjusting device for a nozzle tip water mixing type liquid burner according to claim 1 or 2, wherein a combustion air supply amount is determined in accordance with the presence or absence of water injection into the fuel oil and the water injection amount. An air volume adjusting device in a nozzle tip water mixing type liquid burner, characterized in that an air supply amount adjusting device is adjusted so as to obtain a predetermined combustion air supply amount in accordance with water injection into oil. Hydraulic spray type burner that injects water into fuel oil at the nozzle tip and sprays and burns the water-mixed fuel immediately after mixing, the amount of water supplied to the burner, or the amount of injected water that is adjusted proportionally The nozzle tip water is provided with a regulator and an air supply regulator that regulates the amount of combustion air supplied to the burner, and the amount of water injected into the fuel oil is changed by controlling the injection water regulator. In the mixed-type liquid burner, the fluctuation of the fuel oil supply amount to the burner that fluctuates according to the water injection into the fuel oil is detected, and the air supply amount adjusting device is controlled according to the fluctuation of the fuel oil supply amount, An air volume adjusting device in a nozzle tip water mixing type liquid burner, characterized in that the amount of combustion air supplied to the burner is adjusted.

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