JPH01179814A - Manufacture of fuel oil mixed with air and water and its manufacturing device - Google Patents

Abstract

PURPOSE:To obtain a fuel oil of low viscosity and short ignition time, by mixing air and water into a fuel oil used for a boiler and gas turbine, agitating the mixed fuel oil under non-emulsification status, turning a small amount of air into air foam, carrying out static coupling in the fuel oil, then producing a fuel oil. CONSTITUTION:A fuel oil into which air and water are mixed, is produced by mixing and agitating a small amount of air into the oil at first so that the air may be dispersed into fine particles in the oil and positively charged, and mixing a proper amount of water into the air. When the water is mixed into a mixture of air and oil, and agitated at the same time, air bubbles adhere to water drops, thereby producing electrical neutral status. As a result, a specified fuel oil mixed with air and water can be obtained. A manufacturing device for fuel oil mixed with air and water comprises an agitation tank 25 having an agitation member 10, a bulkhead 15 and a mixing member 20, a curing tank 26, an air and oil supply line 30, and a water and air supply line 40. The curing tank 26 comprises a transfer pipe 27 installed at the upper part of the agitation tank 25, an output nozzle 28 of fuel oil, and a discharge nozzle for excess air.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steam-water mixed fuel oil used in boilers, industrial furnaces, gas turbines, diesel engines, etc.

[Conventional technology] Amid social demands for energy conservation and the development of alternative energy, improvements in fuel oil combustion efficiency, safety, and air pollution prevention (
Various improvements and developments have been made, including measures against NOx and dust.

In order to increase the combustion efficiency, proper atomization of oil and contact conditions with air are necessary.
Alternatively, various attempts have been made to add water, additives, etc. For example, attempts have been made to create an oil-water emulsion in which water is mixed with fuel.

In addition, in order to prevent pollution such as NO, control, etc., change operating conditions such as lowering the air preheating temperature and reducing the combustion chamber load, or suppressing the generation of NO at the fuel abyss in the primary combustion and using the secondary air. A secondary combustion method that burns unburned components, an exhaust gas circulation method that mixes low-temperature combustion exhaust gas into the combustion air, a method that injects water or steam into the combustion gas, or a No.
Also, there is a multi-stage combustion method in which hydrocarbons are mixed into high-temperature gas containing residual oxygen to decompose NO, and then air is added to burn the combustible components, or (as shown in Figures 7a to 70) oil, Burners for air, water, and mixed combustion have been tried.

[Problems to be Solved by the Invention] In the above-mentioned oil-water emulsion, the fine water droplets contained in the oil are explosively vaporized by the radiant heat of the flame during combustion, and the bumping (micro-explosion) phenomenon at this time causes the water droplets to explode. It is expected that oil particles (50 to 150μ) will be further dispersed and the combustion efficiency will be improved by dividing the oil into two or more particles. This was a negative result, and the occurrence of the micro-explosion due to the addition of water was not significantly observed, and the improvement in combustion efficiency was not as high as expected. On the other hand, the advantage of suppressing NOx by adding water and the disadvantage of delayed ignition are offset, and oil-water emulsions have not become widespread to this day.

IC1: Changing the operating conditions, the secondary combustion method, and the multistage combustion method each have their advantages and disadvantages.
Currently, there are no products that have the functions of suppressing x and reducing soot and dust.

In addition, various burners shown in FIGS. 7a to 7C have been developed, all of which are for mixed combustion of air, water, and oil.
~57 was inserted, so no great effect was obtained.

In view of the above, the present invention provides a method and apparatus for producing fuel oil that satisfies the various functions described above by developing fuel oil containing a small amount of air and water.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for stabilizing the dispersion of oil and water without emulsifying water by mixing air with a low amount of ffi into oil together with water. This is Shishino. That is, the manufacturing method of the present invention is characterized in that air is separately supplied to an oil supply line and a water supply line, and a small amount of water and air are stirred and mixed with oil. Also,
At the time of stirring and mixing, a small amount of air was first stirred and mixed with the oil, and then a small amount of water and air were further supplied and stirred and mixed.

Further, as a manufacturing device, a stirring mixing tank having a stirring part for stirring air, water, and oil, and a mixing part formed outside the stirring part with a porous partition in between; the stirring mixing tank; and a curing tank connected by an overflow transfer pipe and having an excess air outlet in the upper part and a fuel oil outlet for mixing air and water in the lower part;
It is characterized by consisting of an oil and air supply line provided at the bottom of the stirring section; and a water and air supply line provided at the middle part of the stirring section. right,
The mixing section has a partition plate for slowing down the rising speed of the stirred liquid.

[Function] Since the present invention has the above configuration, a line for supplying a mixture of oil and air and a line for supplying a mixture of water and air are provided separately, and the supply timings are staggered and the mixture is stirred and mixed. Because of this, air is dispersed in the oil as small bubbles of about 1 μm, and water is dispersed in the oil as ice particles of about 5 to 10 μm, each of which becomes positively and negatively charged.

As a result, the air-water mixed fuel oil formed through the above stirring and mixing process does not emulsify, and a small amount of air and water are dispersed and mixed in a stable state, resulting in low viscosity and ultra-low 02 combustion. Can provide high fuel A oil.

[Example] Hereinafter, the manufacturing method and manufacturing apparatus of the present invention will be specifically explained based on the drawings.

FIGS. 1 and 2 are diagrams showing the state of dispersion of water and air in the fuel oil at temperature of air and water according to the present invention at d3. FIG. 1 shows the state of dispersion charging when oil and air are mixed, and FIG. 2 shows the state of dispersion charging when a mixture of oil and air is mixed with a mixture of water and air.

1 is oil, 2 is ice grains, and 3 is air bubbles.

The air-water mixture fuel oil of the present invention is optimally mixed with air at a volume ratio of 1% or less and water at a volume ratio of around 3 to 5%. It exhibits excellent fluidity and combustibility.

As shown in FIGS. 1 and 2, the ice particles have a particle size of 5 to 10 μm, and the air bubbles are about 1 μm, which are scattered or attached to the oil or the surface of the ice particles. That is, oil that is being transferred or stirred generates static electricity, carbon substances, sediment, etc. in the oil are positively charged, metals are negatively charged, and when water is present in the oil, the water is negatively charged.

In the case of the fuel oil mixed with steam and water of the present invention, the added water is 3 to 5% Vo.
The presence of L processes the negative charge, attracts positively charged substances in the oil, such as positively charged air bubbles and carbon material sediment, and attaches them to the surface of the water particles, completely eliminating the static electricity in the oil. This is done so that it is neutralized and placed in an electrically stable state. In other words, water is added at the same time as an intermediary to mix a small amount of air into the oil in a stable state, so that the positively charged air bubbles 3 in the oil are mixed into the oil and are also negatively charged. ice grains 2
It maintains a stable state by suctioning around it, and does not require emulsification like oil-water emulsions.

In order to obtain a fuel oil with a mixture of air and water having the above structure, as shown in FIG. Next, if an appropriate amount of water is mixed with air and stirred into the mixture of air and oil, air bubbles 3 will adhere to the ice particles 2 as shown in Figure 2, resulting in an electrically neutral state. , fuel oil with a desired air-water mixture can be obtained. Incidentally, the excess air not attached to the surface of the ice particles is naturally released into the atmosphere shortly after the stirring is finished.

In other words, the air-water mixed fuel oil of the present invention generates buoyancy by adhering air bubbles around ice particles scattered in the oil, and the air bubbles act to prevent emulsification, causing friction between water particles. This is done to reduce the flow resistance and lower the viscosity. In addition, by adjusting the mixing ratio of air and water to oil at an appropriate volume ratio of 1 to 2% and 5%, respectively, all the air bubbles are attached to the surface of the ice particles, and the air bubbles are absorbed by the oil-water emulsion due to their insulating effect. This is to act as a detonator for the vaporized gas and speed up ignition without hindering the vaporization of the oil cake by the emulsified water.

Since the air-water mixed fuel oil of the present invention has the above-mentioned manufacturing method, the air becomes bubbles in the first stirring and mixing process of air and oil, and is dispersed in the oil, and the bubbles and carbon substances are positively charged. . Next, if water is mixed with 3 to 5% VoL to the specified oil mixed with air and stirred, the water becomes 5 to 1% VoL.
It becomes ice particles of 0μ and is dispersed in the oil cake and becomes negatively charged. The negatively charged ice particles attach positively charged air bubbles and carbon particles to the surface of the suction water particles to maintain an electrically stable state.

When burning the fuel oil configured as described above, air bubbles are attached to the ice particles dispersed in the oil, creating buoyancy, and the air bubbles prevent emulsification, so the frictional resistance between water particles is extremely small. , the viscosity decreases.

As shown in the experimental results in Figure 3, in the case of air-water mixed fuel oil, when the temperature reaches around 50°C, the viscosity is 90% when the water addition rate is 4%.
cst, but in the case of oil-water emulsion, the temperature is 30 at 50℃.
It shows 200cst in %. (Oil-water emulsion is 30%
(It is stabilized by the addition of water.) Then, when igniting, the air bubbles attached to the surface of the ice particles act as a heat insulator, do not hinder the vaporization of the oil scum, and act as an initiator for the vaporized gas, increasing the ignition speed. In this way, a small amount of water and air becomes a combustion catalyst, and a small amount of air (according to actual measurements, air ratio is 1.05, combustion efficiency is 99.999%)
) with ultra-low 02 combustion, reducing soot, dust, NOx, and S.
O3 peroxide generation can be suppressed to a low level. Figure 4 shows the air ratio, residual oxygen amount, and combustible region in the air-water mixed fuel oil and oil-water emulsion (emulsified fuel 113I>) of the present invention and normal fuel. How is the combustion efficiency of fuel oil compared to other fuels?
It can be understood that 10- is good and ultra-low 02 combustion is possible.

Next, we will discuss the steam/water mixing fuel oil manufacturing device, which is called d3.

FIG. 5 is a front view showing an outline of the air/water temperature fuel oil manufacturing apparatus of the present invention. In the figure, 10 is a stirring part, 11 is a stirring blade, 15 is a partition, 20 is a mixing part, 21 is a partition plate, 25
2G is a stirring mixing tank, 2G is a curing tank, 27 is a fuel oil outlet for air/water mixing, 28 is a transfer pipe, 29 is an excess air outlet, 3
0 is the oil/air supply line, 35.45 is the air pressure source, 32 is the oil tank, 33 is the oil pump, 34.43 is the cumulative flow rate, 40 is the water/air supply line, and 43 is the water supply pump.
be.

The air/water temperature fuel oil production apparatus includes a stirring section 10 and a stirring section 10.
It consists of an agitating mixing tank 25 having a partition wall 15 and a mixing part 2o installed in the outer cylinder part, a curing tank 26, an oil/air supply line 30, and a water/air supply tube 40.

The stirring section 10 has upright multistage blades 11, and is composed of a motor 13 for driving the stirring blades, a driving section 12, and the like. Partition wall 15
forms the outer cylindrical part of the stirring part 10, and is a porous part that can be circulated and is made of, for example, a punching plate, so that the stirred liquid stirred in the stirring part can pass through the inside and outside of the partition wall. .

The mixing section 20 is arranged by installing the partition wall 15 on the outer periphery of the stirring section 10, and a plurality of upper and lower partition plates 21 are fixed to the cylindrical inner wall, and the mixing section 20 passes through the partition wall 15. The stirring liquid that has flowed into the stirring section 10 is designed to flow back to the stirring section 10 again. Together with the repeated flow of the stirring liquid into the mixing section and the reflux from the mixing section to the stirring section and the cavitation effect by the stirring blades, the air bubbles mixed in the oil are made as small as possible, and the stirring 1 yen The amount of static electricity induced is maximized so that air bubbles completely form on the surface of the ice particles mixed in the oil.

The curing tank 26 is located a3 above the stirring and mixing tank 25 consisting of the stirring section 10, the partition wall 15, and the mixing section 20, and is connected to the stirring tank 25 by a transfer pipe 27 to temporarily store fuel oil mixed with air and water that has been sufficiently stirred. This is a tank for settling the fuel oil into a stable state, and includes a transfer pipe 27 to the curing Wi 26 installed at the top of the stirring mixing tank 25, an outlet 28 for the fuel oil installed at the bottom, and a The oil level in the stirring mixing tank 25 is always kept constant, and fresh air, water, and oil are supplied from the bottom of the mixing tank to thoroughly stir the air and water. The fuel oil is transferred and stored in the curing tank 26 by overflow through the transfer pipe 27. Also, during storage, excess air mixed in the oil in an unstable state is removed as excess air. The fuel oil, which is electrically neutral and has a stable temperature of air and water, is taken out from the lower outlet 28 so as to be naturally discharged from the outlet.

The oil and air supply line 30 includes an oil tank 32, an oil pump 33, an integrated flow m, it 34, and an oil supply line consisting of a flow hanging throttle valve 31, and an air pressure source 35J: an air supply line including a check valve 36. 30a into the oil, and the mixture of oil and air is supplied to the lower part of the stirring section 10 via the check valve 37.

The water/air supply line 40 is a water supply line 40 in which water is supplied from a water source 41 via a water supply pump 42 and an integrated flow meter 43, and a throttle valve 44 sends out an appropriate amount of water (3 to 5% by volume relative to oil). Pressurized air is mixed into the line 40 from an air pressure source 45 through an air supply line 40a including a check valve 46, and is supplied to the middle part of the stirring section 10 via the check valve 47.
A time rack is given to the supply of air, during which time the air becomes fine bubbles in the oil, becomes positively charged, and disperses. A3. In order to improve the stirring efficiency and the cavitation effect, further effects can be expected by using an impeller type stirring blade 11 shown in FIG. 6.

In addition, in the oil and air supply lines 30 and water and air supply lines 40 in FIG. 5, air supply lines 30a and 4 are provided on the delivery side of the oil pump 33 and water supply pump 42.
0a is connected to push air, but instead of pushing air on the delivery side, an air suction line (not shown) has a check valve and a needle valve on the suction side of the oil pump 33 and water supply pump 42. air supply lines 30a, 40 each connected to the air supply lines 30a, 40 and including a pneumatic source 35.45;
Simplification can be achieved by omitting a.

Since the manufacturing apparatus of the present invention has the above configuration, its operation will be explained as follows.

If an oil-air mixture in which air is mixed in oil is supplied through the oil-air supply line 30 to the lower part of the stirring section 10 while it is being driven via the motor 13 and the drive section 12, as shown in FIG. The oil 1 induces static electricity and becomes negatively charged, and the air mixed in becomes bubbles 3 of about 1 μm, which are positively charged and dispersed in the oil. Next, if a mixture of water and air mixed with air is supplied through the water/air supply line 4o, the water will be
The ice particles 2 of about 10μ are dispersed in the oil while being negatively charged, and as shown in FIG. 2, the negatively charged ice particles 2 attract the bubbles 3 of the positive potential in the oil. By adhering it to the surface, electrically stable fuel oil containing a mixture of air and water can be obtained. The oil is properly adjusted and supplied by the throttle valve 31 of the oil/air supply line 30, and the water is adjusted to the adjusted oil amount by the throttle valve 44 of the water/air supply line 40 to a volume ratio of 3 to 5%. is supplied while maintaining the supply amount. In this way, oil, water, and air having a proper mixing ratio are stirred and mixed while moving back and forth between the stirring section 10 and the mixing section 20 via the partition wall 15, and are transferred via the transfer vibrator 27. It is transferred to the curing tank 26 and stored. The excess air mixed in during the storage period becomes surplus air and is released outside the aircraft.

[Effects of the Invention] As described above, the present invention mixes air and water in oil in a non-emulsified state and stirs the air, turns a small amount of air into bubbles of about 1μ, and stirs them into ice particles of 5 to 10μ in oil. Because electrostatic coupling is made using the static electricity induced by the above-mentioned super It is possible to provide a method for producing fuel oil that fully functions in suppressing NO, soot, etc. due to low 02 combustion.

In addition, the production equipment includes a stirring mixing tank consisting of a stirring section with multi-stage stirring blades and a mixing section having a multi-stage reflux partition plate outside the stirring section via a porous partition wall, and a stirring and mixing tank in which fuel is stirred and mixed. Since the oil/air supply line and the water/air supply line are separately provided in the agitation mixing tank consisting of a curing tank for stabilizing the oil, the fine dispersion of air bubbles within the song and the charging of the air bubbles and oil are carried out in advance. , by supplying a mixture of water and air, ice particles are dispersed and charged, enabling electrostatic bonding between ice particles and air bubbles, and creating a fuel oil production device that produces a stable mixture of air and water without emulsification. Can be provided.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the mixing and charging state of oil and air bubbles, which is the first process of mixing fuel oil in the air-water mixture of the present invention, and Figure 2 is a diagram showing the state of dispersion and charging of ice particles and bubbles in the oil. FIG. 3 is a diagram showing the relationship between viscosity and temperature of the fuel oil mixed with air and water of the present invention and emulsified fuel, and FIG. A combustible area diagram for fuel, FIG. 5 is a side view showing an overview of the manufacturing apparatus of the present invention, FIG. 6 is a perspective view showing an outline of the impeller stirring blade of the stirring part in the same manufacturing apparatus, and FIGS. 7a to 7C. The figures are diagrams showing various types of conventional air-water-oil mixed combustion burners. 1... Oil, 2... Ice grains, 3... Air bubbles, 10...
Stirring unit, 11... Stirring blade, 12... Drive unit, 13.
... Motor, 15 ... Partition wall, 20 ... Mixing section, 21
... Partition plate, 25 ... Stirring mixing tank, 26 ... Curing tank, 27 ... Transfer pipe, 28 ... Outlet, 29.
... Surplus air outlet, 30... Oil, air supply line,
40... Water air supply line, 31.44... Throttle valve, 32... Oil tank, 33... Oil pump, 34
．． 43... Integral flow meter, 35.45... Air pressure source, 3
6.37.46.47...Check valve, 42...Water supply pump.

Claims (1)

[Claims] 1. A method for producing fuel oil by mixing air and water, which comprises supplying air separately to an oil supply line and a water supply line, and stirring and mixing a small amount of water and air into oil. 2. The method for producing fuel oil by mixing air and water according to claim 1, by stirring and mixing a small amount of air with oil, and then supplying a small amount of water and air and stirring and mixing. 3. A stirring mixing tank having a stirring part for stirring air, water, and oil, and a mixing part formed outside the stirring part through a porous partition; connected to the stirring mixing tank by an overflow transfer pipe. a curing tank with an excess air outlet at the top and a fuel oil outlet for mixing air and water at the bottom; an oil and air supply line provided at the bottom of the agitation section; and a water and air supply line provided at the middle of the agitation section. A fuel oil manufacturing device that mixes air and water with a supply line. 4. The air-water mixed fuel oil according to claim 3, wherein the stirring section has a plurality of impeller-shaped multi-stage stirring blades, and the mixing section has a partition plate for slowing the rising speed of the stirred liquid. manufacturing method.