JPS6011071B2 - Method for preparing and storing emulsion fuel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of preparing and storing emulsion fuel.

If an emulsion fuel consisting of oil and water is left stationary in a storage tank for a long time, separation of oil and water will eventually progress, particles of dispersed components will coagulate, and the oil-water ratio distribution will become uneven.

Water with a high specific gravity will settle to the bottom of the tank, and a gel-like substance with high viscosity will be produced in such areas with a high water content. Such oil/water separation and agglomeration of dispersed particles reduce performance as a fuel, causing inability to ignite or burn, and formation of gel-like substances also causes inability to feed liquid. This phenomenon of emulsion fuel appears more prominently in vertical oils such as Class 1 heavy oil (A heavy oil) and light oil. Conventionally, to avoid such problems, expensive emulsifiers have been added to the mixture, but using such extra emulsifiers not only increases fuel costs, but also reduces the amount of emulsifiers used. Depending on the situation, there is a problem that it may become a factor that reduces the combustion efficiency of the fuel. The purpose of the present invention is to solve the above-mentioned problems, to avoid necessarily using expensive emulsifiers, to easily re-emulsify even if oil-water separation occurs, and to maintain a good emulsion state at all times. The object of the present invention is to provide a method for preparing and storing emulsion fuel that can maintain the following properties.

The method for blending and storing emulsion fuel of the present invention which achieves the above object includes connecting a mixing tank having a mixing tank inside, a pump, and a motionless mixer in this order in series with a continuous pipe in a closed circuit. In the closed circuit, an emulsion fuel consisting of oil and water is forcedly circulated through the pump to make the oil/water ratio distribution uniform in the mixing tank, and further, the particles of the dispersed component are made fine by the motionless mixer. This is a characteristic feature.

In the present invention, it is preferable that the emulsion fuel is of the water-in-oil type, and the water component in the fuel is 2 to 4 ol%.

In addition, it is suitable to use Type 1 heavy oil (A heavy oil) or light oil, which has a viscosity of 2 relative st or less at 50 oo. The feeding means installed in the mixing tank includes dynamic means such as rotary blades driven by a motor outer shell, as well as static means such as a static injection nozzle that injects fuel into the tank at high pressure. It can be a means.

A motionless mixer is a so-called static mixer that has no moving parts, and uses, for example, fixed blades installed in a pipe to repeatedly separate, phase invert, and recombine fluids. All of these are applicable. The embodiments shown in the figures will be explained below.

FIG. 1 is a schematic diagram of a process for carrying out the emulsion fuel preparation and storage method of the present invention, in which 1 is a mixing tank, 2 is a pump, and 3 is a motionless mixer.

The mixing tank 1, pump 2, and motionless mixer 3 are connected in this order through a connecting pipe 4 so as to form a series closed circuit. Inside the mixing tank 1, an azure blade la serving as an azure means is installed so as to be rotated by a motor, and oil and water which have been pre-mixed or completely mixed at a constant ratio through a supply pipe 5 are installed. An emulsion fuel consisting of: 6 is a level meter that detects the upper limit level of the emulsion fuel in the mixing tank 1; 7 is a level meter that detects the lower limit level.

Further, 8 is an emulsion fuel extraction pipe, and valve 9
It is adapted to be extracted from the pump 10' through the pump 10'. In the above-mentioned horizontal formation, in the mixing tank 1 where the preliminary or completely mixed emulsion fuel is supplied from the supply pipe 5 into the mixing tank 1 up to the upper limit level, the oil-water ratio distribution is made uniform by the hawk blade la. While the fly azure is being carried out, the air is forcibly circulated by the pump 2 through the connecting pipe 4 in a closed circuit including the motionless mixer 3 while continuing the fly azure.

In this forced circulation, in the Namiai tank 1, the non-uniformity of the oil/water ratio distribution is suppressed due to the fly-azus effect of the Nada-azusa blades la, and the formation of gel-like substances due to water separation is also suppressed. Moreover, when the particles are circulated through the closed circuit while maintaining such a uniform state, the coarsely dispersed particles are made fine in the motionless mixer 3. The emulsion fuel is prepared by repeating such forced circulation, and the emulsion fuel is stored at the same time as the parenthetical preparation is carried out. The emulsion fuel prepared and stored as described above is extracted from the mixing tank 1 through the extraction pipe 8 in a fixed amount at a time from the pump 1, and is then removed from the combustion device (not shown).
supplied to

In this way, when the emulsion fuel in the mixing tank 1 reaches the lower limit level, the reserved or completely mixed emulsion fuel is again supplied from the supply pipe 5 to the upper limit level, and the mixture is in the same closed circuit as described above. The blending operation is carried out by forced circulation. In addition, the first
The hawk floating feather la shown in the figure may be positioned below the lower limit level meter 7. Of course, they may be provided at both positions. FIG. 2 shows a schematic diagram of another process for carrying out the present invention.

In this embodiment, a supply pipe 25a for supplying oil ○ and a supply pipe 25b for supplying water W to the mixing tank 1 are respectively provided, and each supply pipe 25a, 25b has a flow meter 26a, 26b, respectively. and this flowmeter 26a, 2
Valves 27a and 27b are provided which operate in conjunction with valve 6b.

Flowmeters 26a and 26b automatically open valves 27a and 27 when predetermined flow rates of oil and water are metered, respectively.
b is closed to stop the supply, and a constant ratio of oil and water is supplied into the mixing tank 1. Inside the mixing tank 1, the barrel feeder (la) rotates to perform the takashi, and while performing this takashi, the pump 2 is forced to circulate in the closed circuit of the connecting pipe 4 to mix the emulsion fuel, and at the same time Storage is performed while performing this operation. A valve 29 is provided between the motionless mixer 3 and the mixing tank 1 in the closed circuit formed by the connecting pipe 4, and an extraction pipe provided with a valve 9 is provided between the motionless mixer 3 and the valve 29. 8 are connected. When blending emulsion fuel, the valve 29 is opened and the valve 9 is kept closed. When a predetermined blend is obtained, the valve 29 is closed and the valve 9 is opened, and the blended emulsion fuel is discharged from the extraction pipe 8. It is extracted and supplied to the combustion equipment. Alternatively, the valves 29 and 9 may be opened to respective adjusted opening degrees, and a portion may be extracted from the extraction pipe 8 while forced circulation in the open circuit of the connecting pipe 4. FIG. 3 is a schematic diagram showing still another embodiment for carrying out the present invention.

In this embodiment, a level meter 3 whose base is set on a mixing tank 1 having an oil supply pipe 258 with a valve 27a and a W supply pipe 25b with a valve 27b provided at the top.
1. A level meter 32 for setting the amount of oil and a level meter 33 for setting the amount of water are installed at predetermined intervals in the height direction.

That is, in this embodiment, the mixing ratio of oil and water is determined not by the flow meters 26a and 26b as in the embodiment shown in FIG.
This is done using level meters 31, 32, and 33. The emulsion fuel in the mixing tank 1 is extracted from the extraction pipe 8 and when it reaches the level meter 31 which sets the base, the emulsion fuel is extracted from the extraction pipe 8 and stopped by closing the valve 9.

Next, the valve 27a is opened, and oil 0 is supplied from the supply pipe 25a until it reaches the level of the level meter 32, and at the same time when it reaches the level meter 32, the valve 27a is closed by a signal. Next, the valve 27b is opened, and after water W is supplied from the supply pipe 25b until it reaches the level of the level meter 33, the valve 27b is closed again. In this way, the level meters 31, 32, and 33 are used to set the mixing ratio of oil and water, and therefore, the setting position of each of the level meters 31, 32, and 33 can be changed arbitrarily in the height direction. ing. A certain ratio of oil and water is supplied to the mixing tank 1.

In the mixing tank 1, as in the embodiment shown in FIG. 2 above, the key azusa blade la is rotated to perform concentration, and the mixture is forcibly circulated by the pump 2 in a closed circuit formed by the connecting pipe 4. . FIGS. 4A and 4B are schematic diagrams showing still another embodiment for carrying out the present invention. In this embodiment, the means for feeding the emulsion fuel in the mixing tank 1 is constituted by an injection nozzle lb fixed inside the upper part of the mixing tank 1.

The injection nozzle lb is connected to a connecting pipe 4 forming a closed circulation circuit, and is installed near the inner wall of the mixing tank 1 so that the injection method is substantially tangential and faces obliquely downward. When the emulsion fuel that is forcibly circulated by the pump 2 is injected into the mixing tank 1 from the injection nozzle lb, it swirls due to the kinetic energy of the liquid itself, and is mixed to keep the oil-water ratio constant. It turns out. Numerals 6 and 7 are level meters for setting the upper limit level and lower limit level, respectively, as in the embodiment shown in FIG.

That is, when the emulsion fuel reaches the level gauge 7 at the lower limit level, the preliminary or completely mixed emulsion fuel is supplied from the supply pipe 5 until it reaches the level gauge 6 at the upper limit level. ．． The emulsion fuel is forcibly circulated in a closed circuit by a pump 2 so as to be mixed. In each of the above embodiments, the flocculation carried out in the mixing tank 1 may be a slow flocculation, and it is sufficient that the distribution of oil and water in the tank is uniform, and rapid flocculation beyond that is sufficient. Not necessarily necessary.

Therefore, there is no need for unnecessarily large flywheel means.
A small one is sufficient. Furthermore, oil to mixing tank 1,
It is also possible to adopt a method in which the loss capacity means la and the pump 2 are operated during the supply of water. In the above embodiments, the case where no emulsifier is used has been described, but of course, the present invention does not imply that an emulsifier may be used in conjunction with the emulsifier if necessary.

As described above, the method for preparing and storing emulsion fuel of the present invention involves connecting a mixing tank having a mixing tank inside, a pump, and a motionless mixer in this order in series through a connecting pipe in a closed circuit. forcedly circulating an emulsion fuel consisting of oil and water through the pump in a closed circuit;
The oil/water ratio distribution is made uniform in the mixing tank, and the particles of the dispersion component are made fine by the motionless mixer, so that the oil/water emulsion fuel is constantly generated in the mixing tank due to the azure effect of the agglomeration means. The mixed distribution of oil and water is made constant, and the coarsening and separation of dispersed particles of water are suppressed, thereby suppressing the formation of gel-like substances at the bottom of the cassock.

Moreover, when the water is forced to circulate in a closed circuit in its dispersed state using a pump, the motionless mixer makes the dispersed particles of water even finer, resulting in a good emulsion state regardless of the presence or absence of an emulsifier, which improves combustion efficiency. High emulsion fuel can be prepared and stored. Example In the apparatus shown in Fig. 1, the diameter of the mixing tank 1 is 45 mm, the height is 65 mm, and the distance from the center of rotation to the tip of the hawk blade la is 15 mm, and the height is 5 mm. It had a two-bladed configuration on the mountainside, and was installed so that the lower end was 10 meters away from the bottom of the mixing tank 1.

In the above-mentioned Yokosei, heavy oil with a viscosity of 7.5 centistokes was added to water at a water addition rate of 2 while rotating the Azusa blade la at 3pm.
Emulsion fuel was prepared at a circulation rate of 40%/min with no emulsifier added. On the other hand, as a comparison, the fly azusa blade Ia in the above apparatus was removed, and the same heavy oil was circulated under the same conditions to perform a blending operation to produce emulsion fuel.

As a result, in the former example, (a) No difference in water addition rate ratio was observed between the upper and lower parts of the tank during mixing operation, and (b) After one week of operation, gelatinous matter was deposited on the lower part of the tank. c) When the equipment is restarted after one period of time after stopping, it takes 5 minutes to re-emulse, whereas in the latter comparative example, b) the difference in water addition ratio between the top and bottom of the tank during mixing operation is approximately 1
0%, B. Operation for 1 time per day, gelatinous substance deposited at the bottom of the cellulose after 1 week. C. When the device is restarted 1 hour after the device is heated, it takes 3 minutes to re-emulsify. ,Met.

[Brief explanation of the drawing]

1 to 4A and 4B are schematic diagrams of steps for carrying out the present invention, respectively, and FIG. 4B is a schematic plan view of the mixing tank of FIG. 4A. 1...Mixing tank, la...Double floating feather (Hazazu means), l
b... Injection nozzle (Hajiazusa means), 2... Pump, 3
...Motionless mixer, 4...Connecting pipe. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A mixing tank having an internal stirring means, a pump, and a motionless mixer are connected in this order in series through a connecting pipe in a closed circuit, and an emulsion consisting of oil and water is mixed through the pump in the closed circuit. A method for preparing and storing emulsion fuel, which comprises forcibly circulating the fuel to make the oil/water ratio distribution uniform in the mixing tank, and further making the particles of the dispersed component fine using a motionless mixer.