TWI391613B - A mixture of emulsion combustion and a mixed liquid supply system for emulsion combustion - Google Patents

Description

Mixed liquid supply system for emulsion burning mixer and emulsion combustion

The present invention relates to a mixer for emulsion combustion for mixing liquid fuel and water, and a mixed liquid supply system for emulsion combustion using the same.

Conventionally, a technique called emulsion combustion in which liquid fuel is mixed with water to form an emulsion and then burned is known. In emulsion combustion, liquid fuel particles are subdivided by the generation of tiny water vapor bursts of water particles upon combustion. Thereby, there is an advantage that the fuel and the air are easily mixed, and the combustion efficiency can be improved. Moreover, the generation of NOx can also be suppressed.

In order to enhance the effect of such emulsion combustion, it is preferred to sufficiently mix the liquid fuel with water to form an emulsion. Further, by using the interfacial activity, it is possible to promote the emulsion of liquid fuel and water. However, in terms of cost reduction, it is preferable to use a surfactant instead of a surfactant, and it is preferable to mix the liquid fuel and water into an emulsion. . Therefore, it has been proposed to mix liquid fuel and water into an emulsion without using a surfactant, for example, by mechanical design, or using reduced water (water with reduced redox potential) as water mixed with liquid fuel. A mixer for emulsion combustion of various structures (see, for example, Patent Documents 1 and 2).

[Patent Document 1] JP-A-6-319971

[Patent Document 2] JP-A-2000-329308

However, even if the above-described conventional emulsion burning mixer is used, there is a case where the liquid fuel and water cannot be sufficiently mixed into an emulsion. Moreover, in the case of using reduced water, there is also a problem that the cost of producing reduced water is required.

The present invention has been developed in view of the above problems, and an object of the invention is to provide a mixer for emulsion combustion which can sufficiently mix a liquid fuel and water into an emulsion without using a surfactant, reduced water or the like. And a mixed liquid supply system for emulsion combustion using the mixer.

In order to solve the above problems, the emulsion burning mixer of the present invention includes a slightly cylindrical body, and a mixture of liquid fuel and water is mixed from an inlet end of one end to an outlet end of the other end. a tubular portion in which the liquid flows in one direction; and a side in which the inner side of the tubular portion is partitioned from the side of the inlet end and the side of the outlet end, and is disposed inside the tubular portion and formed on a side communicating with the inlet end and the outlet end In the agitator of the plurality of through holes on the side, the tubular portion has a shape in which the inner diameter is smaller from the side of the inlet end toward the outlet end, and the diameter is smaller than the outlet side of the agitator disposed on the side closer to the outlet end. a tapered portion; and an inner peripheral surface branch-outlet inner circumferential groove portion formed on the side closer to the outlet end than the outlet-side reduced-diameter tapered portion in the circumferential direction.

Further, the tubular portion has a smaller inner diameter between the outlet-side reduced-diameter tapered portion and the outlet-side inner circumferential groove portion than an end portion of the side of the outlet-side inner circumferential groove portion And an intermediate small inner diameter portion adjacent to the outlet-side reduced-diameter tapered portion, at a boundary between the intermediate small inner diameter portion and the outlet-side inner circumferential groove portion, an inner diameter from a side of the inlet end toward a side of the outlet end Continuous expansion is preferred.

Further, at least a part of the inner circumferential side surface of the outlet-side inner circumferential groove portion is preferably a tapered shape in which the inner diameter is smaller from the side of the inlet end toward the outlet end.

Further, the tubular portion has a shape in which the inner diameter increases from the side of the inlet end toward the outlet end, and is preferably larger than the diameter of the tapered portion on the inlet side of the agitator disposed closer to the inlet end.

Further, the agitator preferably has a shape of a side surface of the slightly tapered body in which the outer diameter and the inner diameter are increased from the side of the inlet end toward the outlet end.

Further, in order to solve the above problems, the mixed liquid supply system for emulsion combustion according to the present invention includes the emulsion combustion mixer according to any one of the above, and a mixed liquid storage tank for storing the mixed liquid; The liquid storage tank supplies the mixed liquid supply unit of the mixed liquid to the emulsion burning mixer; and the mixed liquid mixed in the emulsion combustion mixer is returned to the mixed liquid return portion of the mixed liquid storage tank.

Further, the mixed liquid returning portion has a discharge portion disposed in the mixed liquid storage tank, and the mixed liquid is preferably discharged to the bottom surface of the mixed liquid storage tank.

Further, it is preferable that the discharge portion of the mixed liquid return portion is a tubular member whose tip end is located in the vicinity of the bottom surface of the mixed liquid storage tank and that is inclined in a direction perpendicular to the bottom surface.

Moreover, it is preferable that the mixed liquid supply unit is the first mixed liquid supply unit, and the second mixed liquid supply unit that supplies the mixed liquid to the combustion device from the mixed liquid storage tank.

In addition, the mixed liquid is directly supplied to the combustion tool from the mixer for emulsion combustion, and the mixed liquid return portion is not supplied to the combustion device in the mixed liquid in which the emulsion combustion mixer is mixed. It is preferred that the remaining mixed liquid is refluxed to the aforementioned mixed liquid storage tank.

According to the present invention, it is possible to obtain a mixture for emulsion combustion and a mixed liquid supply system for emulsion combustion in which a liquid fuel and water are sufficiently mixed into an emulsion without using a surfactant, reduced water or the like.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

As shown in Fig. 1, the emulsion burning mixer 10 according to the first embodiment of the present invention includes a slightly cylindrical body and is formed from the inlet end 12A of one end portion toward the other end portion. The outlet end 12B is disposed in the tubular portion 12 in which the mixed liquid composed of the mixed liquid fuel and water flows in one direction, and the tubular portion 12 is disposed on the side of the inlet end 12A and the side of the outlet end 12B. On the inner side, and the agitator 14 formed in a plurality of through holes 14A communicating with the side of the inlet end 12A and the side of the outlet end 12B, the tubular portion 12 has a side having an inner diameter from the side of the inlet end 12A toward the outlet end 12B. The small shape is disposed at the outlet side reduced diameter tapered portion 12C on the side closer to the outlet end 12B than the agitator 14; and is formed closer to the outlet side reduced diameter tapered portion 12C in the circumferential direction The outlet-side inner circumferential groove portion 12D of the inner peripheral surface on the side of the outlet end 12B. Again, the arrows in Figure 1 show the direction in which the mixed liquid flows.

The tubular portion 12 has the first member 16 , the second member 18 , the third member 20 , and the fourth member 22 . Each of the first member 16, the second member 18, the third member 20, and the fourth member 22 is a cylindrical body, and in this order, the side from the side of the inlet end 12A toward the outlet end 12B is coaxially arranged, and They are screwed together and combined.

The inner peripheral surface of the first member 16 has a small inner diameter portion 16A on the side of the inlet end 12A, a large inner diameter portion 16B on the side of the second member 18, and an inner diameter from the small inner diameter portion toward the large inner diameter portion (from The side of the inlet end 12A facing the outlet end 12B has a large shape, and is disposed at the inlet side between the small inner diameter portion 16A and the large inner diameter portion 16B (the side closer to the inlet end 12A than the agitator 14) The tapered portion 16C is expanded. Further, in the vicinity of the end portion on the second member 18 side of the large inner diameter portion 16B, a female screw for coupling the second member 18 is formed. Further, the outer peripheral surface of the first member 16 has a shape having a stepped portion of the small outer diameter portion 16D having the side of the inlet end 12A and the large outer diameter portion 16E of the side of the second member 18, and is in the small outer diameter portion. The 16D is formed with a male thread for combining external piping or the like.

The inner diameter of the second member 18 is larger than the small inner diameter portion 16A of the first member 16, and the larger inner diameter portion 16B is slightly smaller. The agitator 14 is integrally formed at the end of the second member 18 on the first member 16 side. In the portion on the first member 16 side of the outer peripheral surface of the second member 18, a male screw to which the first member 16 is coupled is formed, and the end portion on the third member 20 side of the inner peripheral surface of the second member 18 is formed. In the vicinity, a female thread for coupling the third member 20 is formed.

The outlet-side reduced-diameter tapered portion 12C is formed at an end portion of the inner circumferential surface of the third member 20 on the second member 18 side. Moreover, the portion of the inner peripheral surface of the third member 20 that is closer to the outlet end 12B side than the outlet-side reduced-diameter tapered portion 12C (the portion between the outlet-side reduced-diameter tapered portion 12C and the outlet-side inner peripheral groove portion 12D) It is an intermediate small inner diameter portion 12E. Further, the inner diameter of the small inner diameter portion 12E is constant. Further, the inner diameter of the intermediate portion 12E is equal to the inner diameter of the small inner diameter portion 16A of the first member 16. Further, in the vicinity of the end portion on the second member 18 side of the outer peripheral surface of the third member 20, a male screw to which the second member 18 is coupled is formed, and a portion on the fourth member 22 side of the outer peripheral surface is formed for the fourth portion. The member 22 incorporates a male thread.

The inner peripheral surface of the fourth member 22 has a large inner diameter portion 22A on the side of the third member 20, a small inner diameter portion 22B on the side of the outlet end 12B, and a large inner diameter portion 22A and a small inner diameter portion 22B. The reduced-diameter tapered portion 22C between (the side closer to the outlet end 12B than the agitator 14). Further, the inner diameter of the small inner diameter portion 22B is equal to the inner diameter of the small inner diameter portion 16A of the first member 16 and the inner diameter of the intermediate small inner diameter portion 12E of the third member 20. The reduced-diameter tapered portion 22C corresponds to the inner peripheral side surface of the outlet-side inner circumferential groove portion 12D, and the inner diameter is from the side of the large inner diameter portion 22A toward the side of the small inner diameter portion 22B (from the side of the inlet end 12A toward the outlet end 12B) Side) a tapered shape that becomes smaller. Further, the end surface of the third member 20 facing the reduced-diameter tapered portion 22C in the axial direction is a plane perpendicular to the axial direction, and the tubular portion 12 is formed at the boundary between the intermediate small inner diameter portion 12E and the outlet-side inner circumferential groove portion 12D. The inner diameter from the side of the inlet end 12A toward the side of the outlet end 12B is not continuously expanded. Further, a female screw for coupling the third member 20 is formed in the large inner diameter portion 22A. Further, the outer peripheral surface of the fourth member 22 has a stepped shape having a large outer diameter portion 22D on the side of the third member 20 and a small outer diameter portion 22E on the side of the outlet end 12B, and is formed in the small outer diameter portion 22E. There are male threads for external piping and the like.

The agitator 14 has a shape of a side of a slightly tapered body whose outer diameter and inner diameter become larger from the side of the inlet end 12A toward the outlet end 12B. Further, as described above, the agitator 14 is integrally formed on the second member 18 constituting the tubular portion 12, and is disposed so as to protrude from the side of the inlet end 12A of the second member 18 toward the side of the inlet end 12A. In the agitator 14, a plurality of through holes 14A of about several tens (for example, about 20 to 80) are formed. The diameter of the through hole 14A is about several hundred μm to several mm (for example, about 0.5 to 2.0 mm).

Further, as the liquid fuel, for example, heavy oil, kerosene, gas oil, waste oil, alcohol or dimethyl ether can be used.

Next, the action of the mixer 10 for emulsion combustion will be described.

In the emulsion burning mixer 10, the mixed liquid of the liquid fuel and the water is mixed in one direction from the inlet end 12A of the tubular portion 12 toward the outlet end 12B of the other end portion. The mixed liquid is first decelerated from the small inner diameter portion 16A of the first member 16 constituting the tubular portion 12 through the inlet-side expanded diameter tapered portion 16C, and then reaches the large inner diameter portion 16B (the side of the inlet end 12A of the agitator 14). . The mixed liquid is accelerated while passing through the through hole 14A of the agitator 14, and the mixed liquid discharged from each of the through holes 14A collides with the outlet-side reduced-diameter tapered portion 12C while colliding and mixing with each other. Further, the mixed liquid is in a cavitation state by passing through the through hole 14A of the agitator 14. Thereby, the mixed liquid is remarkably agitated, and the particles of the liquid fuel are separated, so that the particles of water easily enter between the particles of the liquid fuel, and the droplet type emulsion of the liquid fuel and the oil of water travels.

Then, the mixed liquid flows into the intermediate small inner diameter portion 12E through the outlet side reduced diameter tapered portion 12C. At this time, the mixed liquid is stirred by the change in the inner diameter of the tubular portion 12, and the emulsion of the liquid fuel and water further advances, and the separation of the liquid fuel from the water is suppressed.

Then, the mixed liquid flows from the intermediate small inner diameter portion 12E through the outlet side inner circumferential groove portion 12D, and flows into the small inner diameter portion 22B of the fourth member 22 constituting the tubular portion 12. At this time, the mixed liquid is further stirred by the change in the inner diameter of the outlet-side inner circumferential groove portion 12D or the like. In particular, since the inner peripheral side surface of the outlet-side inner circumferential groove portion 12D is tapered like the outlet-side reduced-diameter tapered portion 12C, the inner diameter thereof becomes smaller from the side of the inlet end 12A toward the outlet end 12B, and therefore, the mixing is performed. Similarly to the outlet-side tapered portion 12C, the liquid collides with the tapered inner circumferential side surface of the outlet-side inner circumferential groove portion 12D, and is also significantly agitated. Further, since the inner diameter of the intermediate small inner diameter portion 12E and the outlet side inner circumferential groove portion 12D is not continuously expanded from the side of the inlet end 12A toward the outlet end 12B, the mixed liquid is also caused by this. Stirring significantly. Thereby, the droplet type emulsion in the liquid fuel and the water oil further progresses.

In this way, the emulsion-burning mixer 10 includes the outlet-side tapered portion 16C, the outlet-side tapered portion 12C, and the outlet-side inner circumferential groove portion 12D, so that the liquid fuel can be used. Mix well with water to form an emulsion. For example, the liquid fuel and the water can be sufficiently mixed into an emulsion even without using a surfactant, reduced water or the like.

Next, a second embodiment of the present invention will be described.

In the first embodiment, the reduced-diameter tapered portion 22C of the fourth member 22 constituting the tubular portion 12 and the end surface of the third member 20 facing the reduced-diameter tapered portion 22C in the axial direction are approximated, and the tapered portion is reduced in diameter. 22C corresponds to substantially all of the inner circumferential side surface of the outlet-side inner circumferential groove portion 12D.

On the other hand, as shown in FIG. 2, in the second embodiment, the reduced-diameter tapered portion 22C of the fourth member 22 and the end face of the third member 20 facing the reduced-diameter tapered portion 22C in the axial direction are shown. There is a constant gap in the axial direction, and the reduced-diameter tapered portion 22C constitutes only a part of the inner circumferential surface of the outlet-side inner circumferential groove portion 12D, and the outer circumferential surface of the outlet-side inner circumferential groove portion 12D is other than the reduced-diameter tapered portion 22C. The inner diameter of the part is constant. The other configurations are the same as those in the first embodiment, and the same reference numerals are given to those in FIG. 1 and the description thereof is omitted.

In the tapered portion 22C, only a part of the inner circumferential side surface of the outlet-side inner circumferential groove portion 12D is formed, and the inner diameter of the portion other than the reduced-diameter tapered portion 22C of the inner circumferential surface of the outlet-side inner circumferential groove portion 12D is constant. In this case, the liquid fuel and water can also be sufficiently mixed into an emulsion.

Next, a third embodiment of the present invention will be described.

In the first and second embodiments, the reduced diameter tapered portion 22C is formed in the fourth member 22 constituting the tubular portion 12, and the reduced-diameter tapered portion 22C constitutes all or a part of the inner peripheral side surface of the outlet-side inner circumferential groove portion 12D. .

On the other hand, as shown in FIG. 3, in the third embodiment, the reduced-diameter tapered portion 22C and the outlet side are not present between the large inner diameter portion 22A and the small inner diameter portion 22B of the fourth member 22. The inner diameter of the inner circumferential side surface of the inner circumferential groove portion 12D is constant. The other structures are the same as those in the first and second embodiments, and the same reference numerals are given to FIGS. 1 and 2, and the description thereof will be omitted.

In this manner, even when the inner diameter of the inner peripheral side surface of the outlet-side inner circumferential groove portion 12D is constant, the liquid fuel and the water can be sufficiently mixed into an emulsion.

Next, a fourth embodiment of the present invention will be described.

In the first embodiment, the tapered shape tapered portion 22C having a tapered inner diameter from the side of the inlet end 12A toward the outlet end 12B is formed in the fourth member 22 constituting the tubular portion 12, and the third member is formed. The end surface in the axial direction facing the reduced-diameter tapered portion 22C is a plane perpendicular to the axial direction, and the reduced-diameter tapered portion 22C corresponds to substantially all of the inner peripheral side surface of the outlet-side inner circumferential groove portion 12D.

On the other hand, as shown in FIG. 4, in the fourth embodiment, the tapered portion is not formed between the large inner diameter portion 22A and the small inner diameter portion 22B of the fourth member 22. Further, at the end portion on the side of the outlet end 12B of the third member 20, a tapered tapered portion 20A having a tapered inner diameter from the side of the inlet end 12A toward the outlet end 12B is formed, and the tapered portion is expanded. The portion 20A constitutes an inner peripheral side surface of the outlet-side inner circumferential groove portion 12D.

In this manner, even if the inner peripheral side surface of the outlet-side inner circumferential groove portion 12D is a tapered-shaped expanded diameter tapered portion 20A whose inner diameter increases from the side of the inlet end 12A toward the outlet end 12B, the liquid fuel can be used. Mix well with water to form an emulsion.

In the first to fourth embodiments, the tubular portion 12 has the first member 16, the second member 18, the third member 20, and the fourth member 22. However, the configuration of the tubular portion is not limited thereto. For example, the tubular portion may also be a structure composed of a single member. Further, the tubular portion may be a structure composed of two or three members. Further, the tubular portion may have a structure composed of five or more members.

Further, in the first to fourth embodiments described above, the agitator 14 is integrally formed in the second member 18 constituting the tubular portion 12. However, the agitator may be coupled to the tubular portion by screwing or the like.

Further, in the above-described first to fourth embodiments, the agitator 14 has a shape of a side surface of a slightly tapered body having a larger outer diameter and an inner diameter from the side of the inlet end 12A toward the outlet end 12B, but may be used. Other shapes of the mixer. For example, an agitator having a structure in which a circular plate shape which is slightly perpendicular to the axial direction of the tubular portion 12 and a through hole in the axial direction is formed may be used.

Next, a fifth embodiment of the present invention will be described.

The fifth embodiment relates to the mixed liquid supply system 30 for emulsion combustion as shown in Figs. The mixed liquid supply system 30 for emulsion combustion includes the emulsion burning mixer 10 according to any one of the first to fourth embodiments; the mixed liquid storage tank 34 for storing the mixed liquid; and the mixed liquid The storage tank 34 supplies the first mixed liquid supply unit 36 of the mixed liquid to the emulsion combustion mixer 10; and the mixed liquid return portion 38 for returning the mixed liquid mixed in the emulsion combustion mixer 10 to the mixed liquid storage tank 34. And the second mixed liquid supply unit 40 that supplies the mixed liquid from the mixed liquid storage tank 34 to the combustion tool 32.

Further, the mixed liquid supply system 30 for emulsion combustion further has: a liquid fuel storage tank 42 for storing liquid fuel (before mixing with water); and a liquid for supplying liquid fuel from the liquid fuel storage tank 42 toward the mixed liquid storage tank 34. The fuel supply unit 44; and a water supply unit 46 for supplying water to the mixed liquid storage tank 34.

The combustion device 32 is, for example, a blower, and is installed in a boiler such as a greenhouse warmer or a warm air boiler unit, a melting furnace, an incinerator, or the like.

The mixed liquid storage tank 34 is a substantially cylindrical can body, and the bottom surface 34A is slightly flat. The mixed liquid storage tank 34 is provided with a drain valve 34B in the vicinity of the bottom surface 34A. Further, the mixed liquid storage tank 34 is provided with a float sensor 48. The float sensor 48 includes a first float 48A, a second float 48B, and a third float 48C. The three floats are arranged coaxially from top to bottom in this order. The first float 48A is an upper limit height for detecting the liquid level of the mixed liquid. The second float 48B is used to detect the height of the liquid surface in the initial state, in which only liquid fuel or water is supplied first. The third float 48C is used to detect, for example, the lower limit height of the liquid surface of the mixed liquid.

The first mixed liquid supply unit 36 has a valve 36A provided in the vicinity of the bottom surface 34A of the mixed liquid storage tank 34, a pump 36B, a pipe 36C for connecting the valve 36A and the pump 36B, and a pump 36B. The piping 36D connected to the emulsion burning mixer 10 is used. Further, in Fig. 6, the piping 36D is shown by a two-point lock line for convenience of explanation.

The mixed liquid return portion 38 has a valve 38A provided slightly above the center portion of the mixed liquid storage tank 34 in the vertical direction, a pipe 38B for connecting the emulsion combustion mixer 10 and the valve 38A, and a valve 38A connected thereto. The discharge portion 38C disposed in the mixed liquid storage tank 34 discharges the mixed liquid toward the bottom surface 34A of the mixed liquid storage tank 34. Further, in Fig. 6, the piping 38B is shown by a two-point lock line for convenience of explanation. The discharge portion 38C is a tubular member whose front end is located in the vicinity of the bottom surface 34A of the mixed liquid storage tank 34 and which is inclined in a direction perpendicular to the bottom surface 34. The inclination angle of the discharge portion 38C in the direction perpendicular to the bottom surface 34 (vertical direction) is, for example, 25°.

The second mixed liquid supply unit 40 includes a valve 40A provided slightly below the center portion of the mixed liquid storage tank 34 in the vertical direction, and a pipe 40B for connecting the valve 40A and the combustion tool 32.

The liquid fuel storage tank 42 is a slightly cylindrical can body similar to the mixed liquid storage tank 34.

The liquid fuel supply unit 44 is a pipe for connecting the liquid fuel storage tank 42 and the mixed liquid storage tank 34, and the discharge portion 44A at the front end is disposed in the mixed liquid storage tank 34 for directing the liquid fuel toward the mixed liquid storage tank 34. The bottom surface 34A is discharged near the bottom. Further, the liquid fuel supply unit 44 includes a flow meter 44B, a fixing plug 44C, and a solenoid valve 44D.

The water supply unit 46 is a pipe that connects a water pipe, a well, a water tank (none of which is shown) to the mixed liquid storage tank 34, and the discharge portion 46A at the front end is disposed in the mixed liquid storage tank 34 for use in the water tide. The mixed liquid storage tank 34 is discharged near the upper portion. Further, the water supply unit 46 includes a pressure reducing valve 46B, a flow meter 46C, a fixing plug 46D, and a solenoid valve 46E.

Next, the action of the mixed liquid supply system 30 for emulsion combustion will be described.

In the mixed liquid storage tank 34, the liquid fuel is supplied from the liquid fuel storage tank 42 via the liquid fuel supply unit 44, and the water is supplied from the water pipe, the well, the water tank or the like via the water supply unit 46. At this time, for example, only liquid fuel is first supplied to the mixed liquid storage tank 34. When the liquid level of the liquid fuel is detected to be a predetermined height by the second float 48B, the supply of the liquid fuel is stopped, and the supply of water is started. Furthermore, since the water has a larger specific gravity than the liquid fuel, the discharged water moves toward the lower side of the liquid fuel, and the liquid fuel moves upward. Thereby, the liquid fuel and water are stirred to some extent. The detection is performed by the first float 48A, and when it is detected that the liquid level of the mixed liquid reaches a predetermined height, the supply of water is stopped. Thereby, the liquid fuel and the water are stored in the liquid fuel storage tank 42 at a predetermined mixing ratio. Further, first, water may be supplied to the mixed liquid storage tank 34 first, and then detected by the second float 48B. When the liquid level of the water is detected to reach a predetermined height, the supply of the water is stopped, and the liquid fuel is started. Supply. In this case, since the specific gravity of the liquid fuel is smaller than that of water, the liquid fuel to be discharged moves upward and the water moves downward, and the liquid fuel and water are stirred to some extent. By the float sensor 48, the electromagnetic valve 44D of the liquid fuel supply unit 44, the electromagnetic valve 46E of the water supply unit 46, and the like, the supply amount of the liquid fuel and the water is suppressed, and the mixing ratio of the liquid fuel and the water can be automatically adjusted. Furthermore, the adjustment of the mixing ratio of the liquid fuel to the water can also be performed manually by the operator.

In this way, the mixed liquid composed of the mixed fuel and the water stored in the mixed liquid storage tank 34 is supplied to the emulsion combustion mixer 10 via the first mixed liquid supply unit 36, and the liquid combustion mixer 10 is as described above. As described in the first to fourth embodiments, they are sufficiently mixed into an emulsion form. The mixed liquid in which the liquid combustion mixer 10 is mixed into an emulsion is returned to the mixed liquid storage tank 34 via the liquid return portion 38. The liquid is discharged, and the discharge portion 38C of the self-closing liquid return portion 38 is discharged toward the bottom surface 34A of the mixed liquid storage tank 34. Here, the mixed liquid is stirred. In particular, since the tip end portion 38C is disposed in the vicinity of the bottom surface 34A of the mixed liquid storage tank 34 and obliquely disposed in the direction perpendicular to the bottom surface 34, the effect of stirring the mixed liquid can be enhanced. Thereby, the emulsion of the liquid fuel and water can be further promoted. Moreover, the separation of the liquid fuel from the water can be suppressed. Thus, by circulating the mixed liquid between the mixed liquid storage tank 34 and the emulsion burning mixer 10, the mixed liquid can be kept in a state of being sufficiently emulsified, or it can be stored in the mixed liquid storage tank 34. Further, the mixed liquid after the emulsification is not easily separated into a liquid fuel and water. In particular, when the mixing ratio (volume ratio) of the liquid fuel to water is 85 (liquid fuel): 15 (water) to 90 (liquid fuel): about 10 (water), the mixed liquid capable of suppressing the emulsification can be separated into a liquid again. The effect of fuel and water is high.

A part of the mixed liquid which is sufficiently emulsified in the mixed liquid storage tank 34 is supplied to the combustion tool 32 via the second mixed liquid supply unit 40 to be combusted. Since the mixed liquid is sufficiently emulsified, the liquid fuel becomes extremely fine particles, so that it is easily contacted with oxygen. Therefore, it is possible to suppress the generation of CO, and it is possible to achieve combustion with complete combustion or near complete combustion.

Further, by supplying the mixed liquid to the combustion tool 32 and burning, the amount of the mixed liquid stored in the mixed liquid storage tank 34 is reduced. In order to make up the amount of the reduction, the liquid fuel is supplied from the liquid fuel storage tank 42 via the liquid fuel supply unit 44, and the water is supplied from the water supply pipe, the well, the water tank or the like via the water supply unit 46. For example, when the third float 48C detects that the liquid level of the mixed liquid reaches the predetermined lower limit height, the supply of the liquid fuel and the water to the mixed liquid storage tank 34 is started. Thereby, the combustion appliance 32 can continuously perform combustion with complete combustion or near complete combustion.

Next, a sixth embodiment of the present invention will be described.

In the mixed liquid supply system 30 for emulsion combustion according to the fifth embodiment, all of the mixed liquid mixed in the emulsion combustion mixer 10 is returned to the mixed liquid storage tank 34 via the oil mixed liquid return portion 38.

On the other hand, as shown in FIG. 7 , the mixed liquid supply system 50 for emulsion combustion according to the sixth embodiment is configured to directly supply the mixed liquid from the emulsion combustion mixer 10 to the combustion tool 32, and the mixed liquid return portion 38 is configured. The remaining mixed liquid that is not supplied to the combustion tool 32 in the mixed liquid in which the emulsion burning mixer 10 is mixed is returned to the mixed liquid storage tank 34. Further, the second mixed liquid supply unit is not provided. The other configuration is the same as that of the mixed liquid supply system 30 for emulsion combustion according to the fifth embodiment, and the same reference numerals are given to the same members as those in FIGS. 5 and 6, and the description thereof is omitted.

In this way, even if the mixed liquid is directly supplied to the combustion tool 32 from the mixer 10 for emulsion combustion, the mixed liquid return portion 38 is not supplied to the combustion device 32 in the mixed liquid mixed in the emulsion combustion mixer 10. When the remaining mixed liquid is returned to the mixed liquid storage tank 34, the mixed liquid is mixed in the emulsion burning mixer 10, and the liquid fuel is sufficiently emulsified, and the liquid fuel becomes extremely fine particles and is supplied to the combustion tool 32, so that when burning Liquid fuel is easily contacted with oxygen. Therefore, it is possible to suppress the generation of CO, and it is possible to achieve combustion with complete combustion or near complete combustion.

[Examples]

The combustion test was carried out using the mixed liquid supply system 30 for emulsion combustion shown in Figs. 5 and 6 of the fifth embodiment. Further, the mixer for emulsion combustion 10 is a mixer using the structure shown in Fig. 1 of the first embodiment. The main experimental conditions are as follows.

Temperature: about 20 ° C

Wind speed: about 2m

Liquid fuel: A heavy oil

Water: well water (non-reduced water)

Mixing ratio (volume ratio): 87 (A heavy oil): 13 (water)

Inner diameter (diameter) of the small inner diameter portions 16A, 22B and the intermediate small inner diameter portion 12E: 12 mm

Inner diameter (diameter) of large inner diameter portion 16B: 29 mm

Inner diameter (diameter) of the through hole 14A of the agitator 14: 1 mm

Number of through holes 14A of the agitator 14: 51

The diameter of the front end flat portion of the agitator 14: 7 mm

Inner diameter (diameter) of the second member 18: 24 mm

Inner diameter (diameter) of large inner diameter portion 22A: 27 mm

Pump 36B discharge volume: 16.5 liters / time

Inclination angle of the discharge portion 38C in the direction perpendicular to the bottom surface 34A: 25°

Combustion device 32: greenhouse heating machine HK-4025 (inner basin (Nepon) (stock))

Thermocouple for measuring exhaust gas temperature: Thermocouple with terminal box T08 type K (Tokyo Thermal Engineering Co., Ltd.)

Meter: SRF106AS (Yamatake Corporation)

Furthermore, no surfactant was used. Further, the burning appliance 32 is installed outside the house (not in the greenhouse). Under the above conditions, the mixed liquid is supplied to the combustion tool 32 for about 2 hours, and the mixed liquid is burned by the combustion tool 32. First, as a preliminary combustion, the mixed liquid was burned by the burning appliance 32 for about 28 minutes, and the exhaust gas temperature was about 290 °C. Second, carry out the combustion. Specifically, the exhaust gas temperature is about 260 ° C, and the mixed liquid is burned by the combustion tool 32 intermittently for about 100 minutes. Further, the exhaust gas temperature is the temperature at the position of the exhaust port of the greenhouse warmer. Further, about 45 liters of the mixed liquid is initially stored in the mixed liquid storage tank 34, and liquid fuel and water are not supplied in the middle. The exhaust gas temperature and the residual amount of the mixed liquid in the mixed liquid storage tank 34 were measured at intervals of several minutes to ten minutes. The measurement results are shown in Table 1. The total consumption of the mixed liquid of the present combustion, the total consumption of the liquid fuel (A heavy oil) contained in the mixed liquid, and the average consumption of the liquid fuel of the present combustion are collectively shown in Table 1.

[Comparative example]

In the above embodiment, the liquid fuel (A heavy oil) is supplied only to the combustion tool 32 without mixing the liquid. Furthermore, the temperature and wind speed are as follows.

Temperature: 23 ° C

Wind speed: 0m (no wind)

The other conditions are the same as in the above-described embodiment. First, in the same manner as the embodiment, first, the combustion is performed for about 18 minutes, and the mixed liquid is burned by the combustion tool 32 until the exhaust gas temperature is about 290 °C. Second, carry out the combustion. Specifically, the exhaust gas temperature is about 260 ° C, intermittently about 105 minutes, and the mixed liquid is burned by the combustion tool 32. Further, in the same manner as in the examples, the exhaust gas temperature and the residual amount of the mixed liquid in the mixed liquid storage tank 34 were measured at intervals of several minutes to ten minutes. The measurement results are shown in Table 2.

As shown in Tables 1 and 2, although the examples are exhaust gas temperatures equivalent to those of the comparative examples, the average consumption amount of the liquid fuel of the examples was smaller than the average consumption amount of the liquid fuels of the comparative examples. Specifically, the average consumption per minute of the liquid fuel of the comparative example was 0.157 liters, whereas the average consumption per minute of the liquid fuel of the example was 0.142 liters. That is, the average consumption amount of the liquid fuel of the example was about 9.6% less than the average consumption amount of the liquid fuel of the comparative example. As described above, according to the embodiment of the present invention, it has been confirmed that the effect of improving the combustion efficiency of the emulsion combustion can be obtained without using the surfactant, the reduced water or the like.

[Industry use possibility]

The present invention is applicable to, for example, a warming machine for a greenhouse, a boiler, a melting furnace, an incinerator, and the like.

10. . . Emulsion burning mixer

12. . . Tubular part

12A. . . Entrance end

12B. . . Exit end

12C. . . Outlet side reduced diameter taper

12D. . . Outer side inner peripheral groove

12E. . . Middle small inner diameter

14. . . Blender

14A. . . Through hole

16. . . First member

16A. . . Small inner diameter

16B. . . Large inner diameter

16C. . . Inlet side expansion taper

16D. . . Small outer diameter

16E. . . Large outer diameter

18. . . Second member

20. . . Third member

twenty two. . . Fourth member

22A. . . Large inner diameter

22B. . . Small inner diameter

22C. . . Reduced taper

22D. . . Large outer diameter

22E. . . Small outer diameter

30, 50. . . Mixed liquid supply system for emulsion combustion

32. . . Combustion apparatus

34. . . Mixed liquid storage tank

34A. . . Bottom

36. . . First mixed liquid supply unit

38. . . Mixed liquid reflux

38C, 44A, 46A. . . Spit

40. . . Second mixed liquid supply unit

42. . . Liquid fuel storage tank

44. . . Liquid fuel supply department

46. . . Water supply department

Fig. 1 is a cross-sectional view showing the structure of a mixer for emulsion combustion according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the shape of the inner circumferential groove portion on the outlet side of the emulsion burning mixer according to the second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the shape of the inner circumferential groove portion on the outlet side of the emulsion burning mixer according to the third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the shape of the inner circumferential groove portion on the outlet side of the emulsion burning mixer according to the fourth embodiment of the present invention.

FIG. 5 is a side view showing a schematic cross section of a schematic structure of a mixed liquid supply system for emulsion combustion according to a fifth embodiment of the present invention.

Figure 6 is the same plan view.

FIG. 7 is a perspective view showing a schematic structure of a mixed liquid supply system for emulsion combustion according to a sixth embodiment of the present invention.

10. . . Emulsion burning mixer

12. . . Tubular part

12A. . . Entrance end

12B. . . Exit end

12C. . . Outlet side reduced diameter taper

12D. . . Outer side inner peripheral groove

12E. . . Middle small inner diameter

14. . . Blender

14A. . . Through hole

16. . . First member

16A. . . Small inner diameter

16B. . . Large inner diameter

16C. . . Inlet side expansion taper

16D. . . Small outer diameter

16E. . . Large outer diameter

18. . . Second member

20. . . Third member

twenty two. . . Fourth member

22A. . . Large inner diameter

22B. . . Small inner diameter

22C. . . Reduced taper

22D. . . Large outer diameter

22E. . . Small outer diameter

Claims (9)

A mixer for emulsion combustion, comprising: a substantially cylindrical body, a mixed liquid composed of liquid fuel and water mixed from an inlet end of one end to an outlet end of the other end a tubular portion that flows in one direction; and a side that is disposed on the inner side of the tubular portion so as to partition the inner side of the tubular portion from the side of the inlet end and the side of the outlet end, and a side that is formed with the side of the inlet end and the side of the outlet end a stirrer that connects the plurality of through holes, the tubular portion has a shape having a smaller inner diameter from a side of the inlet end toward the outlet end, and is disposed at an outlet side closer to a side closer to the outlet end than the agitator a tapered portion; and an outlet-side inner circumferential groove portion coaxially formed on the inner circumferential surface closer to the outlet end than the tapered portion of the outlet-side tapered portion, the agitator having a side from the inlet end The side of the outlet end has a shape of a side surface of the slightly tapered body in which the outer diameter and the inner diameter become large. The emulsion burning mixer according to claim 1, wherein the tubular portion further has an intermediate small inner diameter portion between the outlet side reduced diameter tapered portion and the outlet side inner peripheral groove portion, the intermediate small inner portion The inner diameter of the diameter portion is the inner end portion of the side of the inlet end of the inner circumferential groove portion of the outlet side The inner diameter of the inner peripheral groove portion side of the boundary between the intermediate small inner diameter portion and the outer side inner circumferential groove portion is smaller than the intermediate small inner portion. The inner diameter of the diameter side. The mixer for emulsion combustion according to the first or second aspect of the invention, wherein at least a part of an inner peripheral side surface of the outlet-side inner circumferential groove portion has a tapered inner diameter from a side of the inlet end toward a side of the outlet end. shape. The mixer for emulsion combustion according to claim 1 or 2, wherein the tubular portion further has a shape having an inner diameter from a side of the inlet end toward a side of the outlet end, and is disposed in comparison with the agitator. Further, the inlet side of the side of the inlet end is expanded to have a tapered portion. A mixed liquid supply system for emulsion combustion, comprising: a mixer for emulsion combustion according to any one of claims 1 to 4; a mixed liquid storage tank for storing the mixed liquid; The mixed liquid storage tank supplies the mixed liquid supply portion of the mixed liquid to the emulsion burning mixer; and a mixed liquid return portion for refluxing the mixed liquid mixed in the emulsion burning mixer to the mixed liquid storage tank. The mixed liquid supply system for emulsion combustion according to claim 5, wherein the mixed liquid returning portion has a discharge portion disposed in the mixed liquid storage tank, and the mixed liquid is directed to the mixed liquid storage tank. Spit out on the bottom. The mixed liquid supply system for emulsion combustion according to the sixth aspect of the invention, wherein the discharge portion of the mixed liquid return portion has a tip end located in the vicinity of a bottom surface of the mixed liquid storage tank and perpendicular to the bottom surface A tubular member that is disposed in a slanted direction. The mixed liquid supply system for emulsion combustion according to any one of claims 5 to 7, wherein the mixed liquid supply unit is a first mixed liquid supply unit, and further includes: burning from the mixed liquid storage tank The second mixed liquid supply unit of the mixed liquid is supplied by an instrument. The mixed liquid supply system for emulsion combustion according to any one of claims 5 to 7, wherein the mixed liquid is directly supplied from the mixer for emulsion combustion to the combustion tool, and the mixed liquid reflux unit is configured. The remaining mixed liquid which is not supplied to the burning apparatus in the mixed liquid in which the emulsion burning mixer is mixed is returned to the mixed liquid storage tank.