JP2006112666A - Combustion device provided with emulsified fuel supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device provided with an emulsified fuel supply system wherein burdens of air supply and exhaust utilities are small, capable of carrying out the operation of the combustion device responding to a regulation value on the basis of an actual combustion state and a concentration of a harmful matter in exhaust gas. <P>SOLUTION: The emulsified fuel supply system has an emulsified fuel supply device supplying emulsified fuel, a boiler 73 burning the emulsified fuel, a detecting means 83 for detecting an exhaust gas temperature in the boiler 73, and an exhaust gas analyzing means 85 for detecting CO or NOx in the exhaust gas exhausted from the emulsified fuel combustion device. It is provided with a controller 87 adjusting a moisture content in the emulsified fuel on the basis of a detection value of the temperature detecting means 83 and/or an analysis value of the exhaust gas analyzing means 85. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a combustion apparatus having a function of supplying emulsion fuel produced by stirring fuel oil and water, and having an emulsion fuel supply system that uses the energy by burning the emulsion fuel.

Emulsion fuels are known in which water is added to fuel oil such as light oil, heavy oil, heavy oil, and stirred to disperse water in the fuel oil. Here, the heavy oil is an oil that has poor fluidity at room temperature and does not flow unless heated to a high temperature, and preferably includes the following oils containing 90% by weight or more of components having a boiling point of 340 ° C. or higher at normal pressure. . Petroleum asphalts and mixtures of oils, various processed petroleum asphalts, intermediate products, residues and mixtures thereof, high pour point oil or crude oil that does not flow at room temperature, petroleum tar pitch and oil mixtures thereof, bitumens, Natural asphalt, orinocotar, tar, residual oil.
When emulsion fuel is sprayed in a high temperature field, the water in the fuel droplets boils instantaneously and further atomizes the fuel droplets (micro explosion), thereby realizing high-speed and high-efficiency combustion, Production of CO soot can be suppressed. Further, since the flame temperature is lowered by the evaporation of water, there is an effect of reducing NOx in the exhaust gas.

As a combustion apparatus that makes use of the characteristics of emulsion fuel having such characteristics, a liquid fuel pump and a water pump, a liquid fuel and water mixing device are provided downstream of each pump, and an oil nozzle is provided downstream of the mixing device. A provided low NOx oil burner has been proposed (see Patent Document 1).
JP-A-6-26618 (refer to claim 1)

In the said patent document 1, the low NOx effect which emulsion fuel has is utilized, and the low NOx driving | operation of a burner can be anticipated.
However, the NOx exhaust amount in the exhaust gas varies depending on the operation state of the burner, and may exceed the regulation value depending on the operation condition, which may increase the burden on the exhaust gas treatment device.
That is, the low NOx oil burner described in Patent Document 1 cannot perform a low NOx operation based on the properties of the exhaust gas actually discharged.

  If combustion control is performed based on the exhaust gas properties, the excess air ratio is adjusted in the combustion process. For example, the excess air ratio is reduced in order to reduce NOx in order to operate in a region where NOx regulations are severe. However, if the excess air ratio is lowered too much, the amount of air for combustion is insufficient, heat loss due to incomplete combustion increases, and CO soot is also generated. Conversely, if the excess air ratio is increased in order to reduce the generation of CO soot, excess air other than the air necessary for combustion is heated and released into the atmosphere, resulting in increased waste heat loss and waste. However, this also increases the absolute amount of NOx generation. Thus, the combustion control based on the excess air ratio has a narrow control range and cannot be controlled sufficiently.

In addition, in the case of combustion control by adjusting the excess air ratio, it is necessary for the auxiliary equipment on the supply side and the exhaust side to have the ability to handle the amount of air that is increased or decreased. For example, if it is assumed that the engine is operated with a high excess air ratio, it is necessary to increase the capacity of the exhaust gas processing device, and it is necessary to increase the capacity of the supply air supply fan.
As described above, the combustion control based on the excess air ratio has a problem that not only a sufficient control cannot be performed but also the burden on the auxiliary equipment for the supply air and the exhaust is heavy.

  The present invention has been made to solve such a problem, and based on the actual combustion state and the concentration of harmful substances in the exhaust gas, the combustion apparatus can be operated according to the regulation value, and the burden on the incidental equipment is also provided. An object of the present invention is to obtain a combustion apparatus equipped with an emulsion fuel supply system with a low content.

(1) A combustion apparatus equipped with an emulsion fuel supply system according to the present invention includes an emulsion fuel supply apparatus that supplies emulsion fuel, an emulsion fuel combustion apparatus that burns the emulsion fuel, an exhaust gas temperature in the emulsion fuel combustion apparatus, Detecting means for detecting at least one of CO concentration or NOx concentration in the exhaust gas discharged from the emulsion fuel combustion device, and the emulsion fuel supply device is based on a detection value of the detection means. It is characterized by comprising water content adjusting means for adjusting the water content in the emulsion fuel.
The moisture content adjusting means may control the moisture content based on any one of detected values of exhaust gas temperature, NOx concentration in exhaust gas, CO concentration in exhaust gas, or any two of these three The moisture content may be controlled based on the detected value, or the moisture content may be controlled based on two detected values of the NOx concentration or the CO concentration in the exhaust gas and the exhaust gas temperature, or these The moisture content may be controlled based on all three detection values.

(2) The emulsion fuel supply device described in (1) above is characterized by including an emulsion fuel production device for producing emulsion fuel by mixing fuel oil and water.
The emulsion fuel production apparatus is an emulsion fuel production apparatus for producing an emulsion fuel by stirring a mixed solution containing fuel oil and added water in a stirring vessel, and supplying the mixed solution containing fuel oil and added water to the stirring vessel. Mixed liquid supply means; first swirl flow forming means for forming a first swirl flow in the mixed liquid in the stirring vessel; and a second swirl flow having a diameter smaller than the swirl diameter of the first swirl flow. And a second swirling flow forming means formed below the swirling flow.
Moreover, it is preferable that the 1st swirl | flow flow formation means in an emulsion fuel manufacturing apparatus consists of an injection nozzle which injects a liquid mixture to the circumferential direction of a stirring container, and a 2nd swirl | flow flow formation means is provided with the stirring blade at least. The second swirl flow forming means may be composed of only the stirring blades, or may be composed of two means of the injection nozzle and the stirring blades for injecting the mixed liquid in the circumferential direction of the container similarly to the first swirl flow forming means. May be.
Further, in the emulsion fuel production apparatus, the average swirling diameter of the first swirling flow is 0.7 to 0.9 times the inner diameter of the stirring vessel, and the average swirling diameter of the second swirling flow is 0. 0 of the inner diameter of the stirring vessel. It is preferably 1 to 0.3 times.
Furthermore, it is preferable that the stirring container of the emulsion fuel production apparatus includes a diameter-reducing nozzle that is diameter-reduced with a smooth curved surface toward the discharge port.

  Furthermore, the emulsion fuel production apparatus includes a premixing tank for premixing added water and fuel oil, a mixed liquid heating means for heating a mixed liquid containing the added water and fuel oil in the premixing tank, and the premixing tank. Added water heating and supplying means for heating and supplying added water, fuel oil heating and supplying means for heating and supplying fuel oil to the premixing tank, and viscosity detecting means for detecting the viscosity of the mixed liquid in the premixing tank And the heating temperature of the mixed liquid heating means, the heating temperature and / or addition amount of the added water heating supply means, the heating temperature and / or supply amount of the fuel oil heating supply means based on the detection value of the viscosity detection means, It is preferable that a control means for controlling at least one of them is provided.

(3) Moreover, the emulsion fuel combustion apparatus as described in said (1) or (2) is any one of a boiler, a diesel engine, and a gas turbine.

  In the present invention, the amount of water added to the emulsion fuel is adjusted on the basis of the exhaust gas temperature of the emulsion fuel combustion apparatus, the NOx concentration and the CO concentration in the exhaust gas, and therefore conforms to the regulation values of the NOx and CO concentrations. Driving can be realized. In addition, since the combustion control is based on the amount of water added, it is not necessary to increase the burden on the supply and exhaust incidental facilities, and the facility cost can be reduced.

[Embodiment 1]
FIG. 1 is an explanatory view of a combustion apparatus provided with an emulsion fuel supply system according to an embodiment of the present invention.
A combustion apparatus equipped with an emulsion fuel supply system according to the present embodiment includes an emulsion fuel production / supply system that produces emulsion fuel and supplies the emulsion fuel to the combustion apparatus, and burns the supplied emulsion fuel and uses energy from the combustion Control the amount of water added to the emulsion fuel by detecting the exhaust gas outlet temperature and / or the exhaust gas state in the combustion / energy utilization system and feeding back to the emulsion fuel production / supply system based on the detection result And a control system. Hereinafter, the devices constituting each system will be described in detail for each system.

<Emulsion fuel production and supply system>
The emulsion fuel production / supply system is supplied with added water, fuel oil and emulsifier, and premixes the premixed tank 1 and the mixture premixed in the premixing tank 1 to further agitate and mix the emulsion fuel. And a stirring device 3 to be manufactured.
The premixing tank 1 has a stirring blade 5, a tank heating means 7 including a heater, a viscosity detecting means 9 for detecting the viscosity of the mixed liquid in the premixing tank, and a temperature detecting means 11 for detecting the temperature of the mixed liquid in the premixing tank. It has.
As the viscosity detecting means 9, a device capable of detecting the viscosity in real time such as a rotational torque viscometer is used.

The premix tank 1 is connected to a fuel oil supply pipe 13 for supplying fuel oil to the premix tank 1, an added water supply pipe 15 for supplying additional water, and an emulsifier supply pipe 17 for supplying emulsifier. A mixed liquid supply pipe 18 for supplying the mixed liquid premixed in the premixing tank 1 to the stirring device 3 side is connected.
A fuel oil storage tank 19 for storing fuel oil is provided on the base end side of the fuel oil supply pipe 13, and a fuel oil transfer pump 21 for transferring the fuel oil in the fuel storage tank to the fuel oil supply pipe 13; A heating means 23 for heating the fuel oil is provided.
The base end side of the additional water supply pipe 15 is connected to an additional water supply source, and in the middle of the additional water supply pipe 15, a flow meter 25 for detecting the flow rate of the additional water flowing through the additional water supply pipe 15, and the additional water And a flow rate adjusting valve 29 for adjusting the flow rate of the added water flowing through the added water supply pipe 15. Further, the added water supply pipe 15 is provided with an added water heating means 31 that can heat the added water and adjust it to 80 ° C. to 120 ° C.
An emulsifier storage tank 33 for storing the emulsifier is provided on the base end side of the emulsifier supply pipe 17, and a transfer pump 35 for transferring the emulsifier of the emulsifier storage tank 33 is provided in the middle of the emulsifier supply pipe 17.
The mixed liquid supply pipe 18 is provided with a control valve 37 for controlling a flow path between a return pipe 57 side and a premixing tank 1 side, which will be described later, and a transfer pump 39 for transferring the mixed liquid to the stirring device 3 side. Yes.

<Agitator>
As shown in FIG. 2, the stirring device 3 includes a stirring container 41, an injection nozzle 43 installed on the side wall of the stirring container 41, and a stirring blade 45 provided at the bottom of the stirring container 41. Each configuration will be described below.
(1) Stirrer container The agitator container 41 is formed below the container body part 47, a substantially cylindrical container body part 47, a diameter-reduced nozzle part 49 that is formed above the container, and a diameter-reducing nozzle part 49. The reduced diameter portion 51 is configured.
The diameter-reduced nozzle portion 49 is formed by an inwardly convex smooth curved surface extending upward, and an upper end portion thereof serves as an outlet for liquid (emulsion fuel or mixed liquid before being emulsified).
A control valve 53 is provided on the outlet side of the reduced diameter nozzle portion 49, and a return pipe for returning the liquid discharged from the reduced diameter nozzle portion 49 to the combustion / energy utilization system side or the injection nozzle 43 side. 57.

(2) Injection nozzle As shown in FIG. 3 which is AA sectional view of FIG. 2, the injection nozzle 43 is formed on the upper peripheral wall of the container main body 47 by liquid injected from the injection nozzle 43. It is installed so that a swirling flow can be formed in the liquid. Specifically, the ejection nozzle 43 is arranged so that the ejection direction of the liquid ejected from the ejection nozzle 43 is directed in a tangential direction of a concentric circle 59 having a diameter d _{1 that is} 0.7 to 0.9 times the stirring vessel inner diameter D. is set up.
When the mixed liquid containing fuel oil, added water, and an emulsifier is supplied from the premixing tank 1 side to the injection nozzle 43 installed in this way, and the supplied mixed liquid is injected from the injection nozzle 43, In a state where the liquid is filled, a first swirl flow 61 is generated in the stirring vessel by the jet flow from the jet nozzle 43.
If the spraying direction of the liquid sprayed from the spray nozzle 43 is set so as to face the tangential direction of the concentric circle 59 having a diameter d _{1 which is} 0.7 to 0.9 times the stirring vessel inner diameter D, the first swirling flow 61 The swirling average diameter is 0.7 to 0.9 times the stirring container inner diameter.

  A control valve 37 is installed in the mixed liquid supply pipe 18 connected to the injection nozzle 43, and a mixed liquid returned from the return pipe 57 or a mixed liquid containing newly supplied fuel oil, added water, and emulsifier is selected. Supplied. The control valve 37 is controlled by control means (not shown).

(3) Stirring blade The stirring blade 45 is installed at the bottom of the container body and is rotatably installed by a motor 63 installed outside the bottom of the container body. By rotating the stirring blade 45, a second swirling flow 65 is generated at the lower part of the container body. The average swirling diameter d2 of the _second swirling flow 65 is 0.1 to 0.3 times the stirring vessel inner diameter D. It is desirable that
Here, as shown in FIG. 4, there is a relationship of d ₂ = df / 2 between the diameter df of the stirring blade 45 and the average turning diameter d ₂ . Therefore, in order to make the average swirling diameter of the second swirling flow 65 0.1 to 0.3 times the stirring vessel inner diameter D, the diameter df of the stirring blade 45 is 0.2 to 0.6 times the stirring vessel inner diameter D. You can do it.
By setting the diameter df of the stirring blade 45 to such a diameter, the load on the stirring blade 45 can be reduced to reduce power consumption, and the wear of the stirring blade 45 can be suppressed, and the maintenance cost can be reduced.

<Combustion and energy utilization system>
As shown in FIG. 1, the combustion / energy utilization system includes a boiler 73 having a combustor 71 that uses emulsion fuel as a fuel, and a steam turbine generator 75 that generates electric power by supplying steam from the boiler 73. It has. The boiler 73 is provided with a blower 74 for supplying combustion air. The steam supplied to the steam turbine generator 75 is recovered by the condenser 76 and supplied again to the boiler 73 side.
The combustion / energy utilization system includes an exhaust gas processing device 77 that processes exhaust gas from the boiler 73, and an induction fan 81 that attracts the processed exhaust gas processed by the exhaust gas processing device 77 to the chimney 79 side to dissipate into the atmosphere. Yes.

<Control system>
The control system, as control information acquisition means for acquiring control information, receives temperature supply means 83 for detecting the exhaust gas outlet temperature of the boiler, and supply of exhaust gas from the boiler 73 to receive NOx concentration and CO concentration in the exhaust gas. Exhaust gas analyzing means 85 for analyzing the above is provided.
The control system also includes a viscosity detecting means 9 for detecting the viscosity of the mixed liquid in the premixing tank, a temperature detecting means 11 for detecting the temperature of the mixed liquid in the premixing tank, and a flow meter 25 for detecting the flow rate of the added water. Is also acquired as control information.
Further, the control system inputs the acquired control information, a flow rate adjusting valve 29 for adjusting the flow rate of the added water, an added water heating unit 31 for heating and adjusting the added water, a heating unit 23 for heating and adjusting the fuel oil, A controller 87 for controlling the tank heating means 7 for heating and adjusting the premixing tank 1 and the blower 74 for supplying combustion air to the boiler 73 is provided.

<Description of operation>
The operation of the present embodiment configured as described above will be described.
Heated addition water, heated fuel oil, and emulsifier are supplied to the premixing tank 1, and these are mixed by the stirring blade 5. In the premixing tank 1, the viscosity and temperature of the mixed liquid are detected, and based on these detection values, the controller 87 controls the temperature of the premixing tank 1, the temperature of the added water, and the temperature of the mixed liquid to be within a predetermined range. The temperature of the fuel oil is controlled.
And after these become an optimal value, the liquid mixture in the premix tank 1 is supplied to the stirring apparatus side.

On the stirring device side, the outlet of the reduced diameter nozzle portion 49 and the return pipe 57 are communicated with each other by the control valve 53, and the mixed liquid supply pipe 18 and the injection nozzle 43 are communicated with each other by the control valve 37.
In this state, a mixed liquid in which fuel oil, added water, and an emulsifier are mixed at a predetermined ratio is supplied to the injection nozzle 43, and the mixed liquid is injected into the stirring container from the injection nozzle 43. When the mixed liquid supplied from the spray nozzle 43 comes to a position above the stirring blade 45 of the stirring container 41, the motor 63 is operated to rotate the stirring blade 45. At this time, the rotation speed of the stirring blade 45 is appropriately adjusted to an optimum value by a control means (not shown). When the inside of the agitation container is filled with the mixed liquid, the control valve 37 is operated to close the mixed liquid supply path, and only the return pipe 57 and the injection nozzle 43 are communicated, and the injection nozzle 43, the agitation container 41, and the return pipe 57 are connected. A circulation path called the injection nozzle 43 is formed. Then, the mixed liquid is emulsified by being stirred in the stirring container 41 while being circulated in the circulation path.

Here, the mechanism of emulsification in the stirring vessel 41 will be described with reference to FIG.
By spraying the mixed liquid from the injection nozzle 43 into the stirring container, a first swirl flow 61 is formed in the horizontal direction in the mixed liquid in the stirring container. Further, by rotating the stirring blade 45, a second swirl flow 65 having a diameter smaller than the average swirl diameter of the first swirl flow is formed below the first swirl flow.
Thus, by forming a double swirl flow composed of the first swirl flow 61 and the second swirl flow 65, as shown in FIG. 2, the bottom of the stirring vessel from the outer peripheral side of the first swirl flow 61. And a secondary flow 91 that passes through the inside of the second swirling flow 65 and faces upward is formed.

  The mixed liquid is agitated by the first swirl flow 61. At this time, a large liquid droplet such as a large liquid droplet or a water-rich liquid droplet moves to the outer peripheral side by centrifugal force, and this is caused by the secondary flow 91. It moves downward and is stirred by the stirring blade 45. At this time, the droplets are further atomized by the shearing action of the stirring blade 45, move upward again, and are stirred by the first swirling flow 61. By such circulation in the stirring vessel 41, the mixed solution becomes a so-called W / O type emulsion having water droplets in the fuel oil. Among these W / O type emulsions, those having a small particle size have a small mass, so that they do not move in the circumferential direction due to the centrifugal force of the first swirl flow 61, but flow upward in the reduced diameter nozzle side. Get on and move to the outlet. At this time, since the diameter-reduced nozzle portion 49 is reduced in diameter toward the downstream side, that is, upward, the liquid increases its swirl speed as it progresses downstream, and shear force acts to promote atomization. .

After the circulation as described above for a certain period of time, when the W / O type emulsion is formed, the control valve 53 at the tip of the reduced diameter nozzle portion 49 is opened to the boiler side. As a result, the emulsified liquid is discharged from the reduced-diameter nozzle portion 49 and used in the boiler as emulsion fuel.
A new mixed liquid is supplied from the injection nozzle 43 and circulates in the stirring container until it is atomized by the action of the first swirl flow 61 and the secondary flow 91. Then, the atomized product rides on the upward flow and moves to the reduced diameter nozzle portion 49 side, and is further atomized by the reduced diameter nozzle portion 49 and supplied to the boiler side.

On the boiler side, the emulsion fuel is supplied to the combustor 71 and burned. At this time, when the emulsion fuel is atomized in a high temperature field, the water in the fuel oil boils instantaneously, and the fuel droplets are atomized to make secondary atomization (micro explosion). Thus, high-speed and high-efficiency combustion is realized, so that combustion with suppressed generation of CO soot is performed. Moreover, NOx in exhaust gas is also reduced by the flame temperature lowering effect due to water evaporation.
The steam generated in the boiler 73 is supplied to the steam turbine generator 75 for power generation. Exhaust gas from the boiler 73 is processed by the exhaust gas processing device 77 and diffused into the atmosphere.

When the emulsion fuel in the boiler 73 is combusted, the exhaust gas temperature at the boiler outlet is detected by the temperature detection means 83, and the concentrations of NOx and CO in the exhaust gas are analyzed by the exhaust gas analyzer 85, and these detection signals and analysis A signal is input to the controller 87. The controller 87 adjusts the amount of water added to the emulsion fuel by adjusting the opening degree of the flow rate adjustment valve 29 based on the detected temperature and the analysis value, and adjusts the air flow rate of the blower 74.
For example, when the NOx concentration is high, the CO concentration is low, and the exhaust gas temperature at the boiler outlet is high, the amount of added water is increased by increasing the opening degree of the flow control valve 29 in order to increase the moisture content. . By increasing the amount of added water, NOx can be reduced by the flame temperature lowering effect due to water evaporation. In addition, since the emulsion fuel has high combustion efficiency by micro-explosion, even if the added water is slightly increased, incomplete combustion does not occur and the CO concentration does not increase rapidly.

Further, when the NOx concentration is low, the CO concentration is high, and the exhaust gas temperature at the boiler outlet is low, the opening of the flow rate adjusting valve 29 is reduced to reduce the amount of added water in order to reduce the moisture content. . By reducing the added water, the combustion efficiency can be increased and the CO concentration can be reduced. At this time, since the combustion efficiency can be increased and the CO concentration can be reduced by slightly changing the control amount of the added water, the NOx concentration does not increase.
Further, when the NOx concentration is high, the CO concentration is high, and the exhaust gas temperature at the boiler outlet is high, the amount of added water is increased by increasing the opening of the flow control valve 29 in order to increase the moisture content, Since NOx is reduced by the flame temperature lowering effect due to evaporation of water and a higher CO concentration is considered to be an air shortage, the amount of air supplied by the air blower is increased.

As described above, in the present embodiment, the moisture addition amount of the emulsion fuel is adjusted based on the exhaust gas temperature at the boiler outlet and the concentration of NOx and CO in the exhaust gas. Boiler operation that conforms to regulatory values can be realized.
Further, in the present embodiment, a double swirling flow composed of the first swirling flow 61 by the injection nozzle 43 and the second swirling flow 65 by the stirring blade 45 is generated in the stirring vessel, and the secondary flow 91 is further generated. Since the fuel oil, added water, and emulsifier are agitated, the atomization of droplets is promoted and emulsified and dispersed as compared with the case of agitating only with the agitating blade. Since the size can be reduced and the torque can be reduced, the power consumption can be reduced. Further, by reducing the torque, the agitation blade can be prevented from being worn, and the maintenance cost can be reduced.

In the present embodiment, since a double swirl flow is generated in the stirring vessel to stir the fuel oil, the added water, and the emulsifier, such as a large droplet or a droplet containing a large amount of water. A material having a large mass is selectively circulated in the stirring vessel for a long time to be atomized, and the atomized material is selectively discharged. For this reason, an emulsion fuel can be manufactured in a short time. Therefore, when the emulsion fuel is produced over a long period of time as in the prior art, it has not been possible to make the emulsion fuel online while using it as it is, but according to the present embodiment, FIG. As shown in FIG. 4, the emulsion fuel produced in the stirring vessel 41 can be directly supplied to an emulsion fuel utilization device such as a boiler without using a large-capacity storage tank or the like.
Further, in the present embodiment, since the reduced-diameter nozzle portion 49 is provided on the discharge side, even when the emulsion fuel is discharged from the stirring vessel 41, it is possible to further atomize by applying a shearing force due to the swirling flow.
In the above-described embodiment, an example has been shown in which an emulsion fuel is manufactured by supplying additive water, fuel oil, and an emulsifier as an emulsion fuel supply system. However, an emulsion fuel is manufactured and immediately burned. In the case where it is not necessary to maintain the emulsified dispersion, the supply of the emulsifier may be omitted.

In the above embodiment, the example in which the stirring blade 45 is installed as the second swirl flow forming means has been described. However, instead of the stirring blade 45, an injection nozzle similar to the injection nozzle 43 may be provided. In this case, in order to make the average swirling diameter of the second swirling flow smaller than the average swirling diameter of the first swirling flow, the newly provided injection nozzle injects the mixed liquid closer to the center than the injection nozzle 43. It is necessary to do so.
In addition, you may make it use an injection nozzle and a stirring blade together.

Moreover, in the above embodiment, an example having a function of manufacturing an emulsion fuel has been shown. However, an emulsion fuel that is separately manufactured without using a function of manufacturing an emulsion fuel is used to produce the emulsion fuel. If necessary, water may be further added and stirred, and the water content of the emulsion fuel may be adjusted based on the exhaust gas temperature and / or the exhaust gas properties at the stage of supply to the combustor.
Furthermore, although the example which provided the premixing tank 1 was shown in said embodiment, fuel oil, addition water, and an emulsifier are directly supplied to the stirring container 41 of the stirring apparatus 3 without providing a premixing tank. It may be.
In the above-described embodiment, an example in which an injection nozzle and a stirring blade are provided as the stirring device has been described. However, a type of stirring device such as a static mixer or a homogenizer may be used.

[Embodiment 2]
FIG. 5 is an explanatory diagram of another embodiment of the present invention. In this embodiment, a diesel engine 100 is used as a combustion device in place of the boiler 73 in the first embodiment. In FIG. 5, the same parts as those in FIG. Further, in the present embodiment, the configuration other than the configuration described in FIG. 5 is the same as the configuration described in FIG.

  As shown in FIG. 5, in the present embodiment, the emulsion fuel produced by the stirring device 3 is injected from the injection nozzle 103 into the combustion chamber of the diesel engine 100 via the injection pump 101 and burned, and the temperature of the exhaust gas And / or the water addition amount and the air supply amount of the emulsion fuel are adjusted based on the exhaust gas properties.

According to the present embodiment, the same effect as in the first embodiment can be obtained.
Further, since the emulsion fuel is used, a so-called Miller cycle engine can be realized.
The Miller cycle engine is to prevent knocking by lowering the compression ratio by blocking the flow of intake air during the intake stroke and reducing the stroke volume. In order to realize such a mirror cycle engine, it is necessary to shorten the combustion time. However, by using emulsion fuel, short-time combustion is realized by the micro-explosion effect of the emulsion fuel, and a mirror cycle engine can be realized.

[Embodiment 3]
FIG. 6 is an explanatory diagram of another embodiment of the present invention. In this embodiment, a gas turbine 105 is used instead of the boiler 73 in the first embodiment as a combustion apparatus. In FIG. 6, the same parts as those in FIG. Further, in the present embodiment, the configuration is the same as that described in FIG. 1 except for the configuration described in FIG.

  As shown in FIG. 6, in the present embodiment, the emulsion fuel produced by the stirring device 3 is burned by the combustor 71 and the combustion gas is supplied to the gas turbine 105. Based on the exhaust gas temperature exhausted from the gas turbine 105 and / or the exhaust gas properties, the water addition amount and the air supply amount of the emulsion fuel are adjusted.

  According to the present embodiment, the same effect as in the first embodiment can be obtained.

It is explanatory drawing of the combustion apparatus provided with the emulsion fuel supply system which concerns on one embodiment of this invention. It is an enlarged view which expands and shows a part of FIG. It is arrow AA sectional drawing of FIG. It is explanatory drawing explaining the relationship between the stirring blade shown in FIG. 2, and the average turning diameter of the 2nd turning flow formed with this stirring blade. It is explanatory drawing of Embodiment 2 of this invention. It is explanatory drawing of Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Premix tank 3 Stirrer 29 Flow control valve 73 Boiler 83 Temperature detection means 85 Exhaust gas analysis means 87 Controller

Claims (3)

Emulsion fuel supply device for supplying emulsion fuel, emulsion fuel combustion device for burning the emulsion fuel, exhaust gas temperature in the emulsion fuel combustion device, CO concentration or NOx concentration in the exhaust gas discharged from the emulsion fuel combustion device Detecting means for detecting at least one of them, and the emulsion fuel supply device comprises a moisture content adjusting means for adjusting the moisture content in the emulsion fuel based on a detection value of the detecting means. A combustion apparatus equipped with an emulsion fuel supply system. 2. The combustion apparatus with an emulsion fuel supply system according to claim 1, wherein the emulsion fuel supply apparatus comprises an emulsion fuel production apparatus for producing an emulsion fuel by mixing fuel oil and water. The combustion apparatus having an emulsion fuel supply system according to claim 1 or 2, wherein the emulsion fuel combustion apparatus is any one of a boiler, a diesel engine, and a gas turbine.

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