JPS6026926B2 - Atomization method for liquid fuel, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for atomizing heavy oil, other liquid fuels, combustible sludge, and the like.

As techniques for atomizing combustion oil, there are known methods such as a method of atomizing the oil using a high-pressure swirl, a method of atomizing the oil using an atomizing medium such as steam, and others.

However, when these methods are applied to atomization of heavy oil,
In the former method, the atomization efficiency decreases significantly as the viscosity increases, and in the latter method, the atomizing medium and high viscosity oil are not mixed sufficiently, so even if a large amount of medium is used, the desired granulation cannot be achieved. It was not possible to atomize the particles to a small diameter, which not only resulted in a disadvantage in terms of energy cost, but also made combustion unstable due to the large amount of medium. This invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a method that can efficiently atomize child oil to a desired particle size.

That is, the present invention involves mixing an additive made of a low-boiling point liquid such as water or alcohol with a substance to be combusted such as liquid fuel or combustible sludge to form an emulsion, pressurizing the resulting emulsion, and then injecting it. The emulsion is heated to a temperature higher than the boiling point of the additive at the internal pressure of the furnace, and then the pressurized heated emulsion is injected into the combustion furnace to atomize the material to be combusted by the reduced pressure boiling phenomenon of the additive. A method of bringing combustion exhaust gas into contact with additives,
This is a method of atomizing liquid fuel, etc., in which carbon dioxide gas in exhaust gas is absorbed into an additive, and the obtained carbon dioxide-containing additive is used to promote a boiling phenomenon under reduced pressure. In the above, the amount of the additive added is preferably 10 to 5% by weight of the material to be burned.

After addition, mix both well with a line mixer. It should be noted that the resulting emulsion cannot be sufficiently atomized by the above-mentioned high-pressure swirling atomization method or by the method of falsifying hair using a medium. However, when the emulsion fuel is burned, the water contained in the fuel droplets boils, and the fuel droplets have the effect of being re-atomized. Therefore, combustibility is improved and soot and dust concentration is reduced. Note that emulsion fuel, which is made by emulsifying heavy trade oil, was developed with the aim of saving energy and reducing pollution. Carbon dioxide gas is a substance that is highly soluble in water, and for example, it has a high solubility in air of about 6M sound (00
It has a solubility of 0).

The higher the content of carbon dioxide gas in the additive, the better, but since exhaust gas is used, it is naturally limited. The reduced pressure boiling phenomenon is
It is produced by pressurizing the liquid and heating it to a temperature higher than the boiling point of the additive under pressure outside the system, and then releasing the pressurized and heated liquid to the outside of the system.

Even if only the vacuum boiling phenomenon is applied to atomize heavy oil, the intended purpose will not be achieved. The reason for this is that high pressure and high heat are required in this case, which causes some of the young oil to thermally decompose and turn into coke in the heater, and gas-liquid two-phase flow to occur due to the gas produced by decomposition, causing fog. This is because it becomes difficult to control the amount.
When water is used as an additive for emulsion, a suitable heating temperature is 120 to 180 qo. As described above, the atomization method according to the present invention combines emulsion of the combustible material with additives such as water and alcohol, and reduced pressure boiling phenomenon, so that the combustible material has its own boiling point. It is atomized at temperatures lower than . Therefore, atomization can be efficiently achieved without causing problems such as thermal decomposition of the oil or coke formation of the oil within the heater. Furthermore, since there is no need to use a mist medium such as steam or air, it is advantageous in terms of energy cost and combustibility is stable. Furthermore, since the additive contains carbon dioxide gas, by further promoting the reduced pressure boiling phenomenon, the particle size of the generated fine particles can be significantly reduced, and the generation of dust due to combustion can be suppressed as much as possible. Example As shown in the drawings, virgin oil with a viscosity of 13 p (150° C.) and water in an amount of 2% by weight thereof are added from an oil tank and a water tank 2 through pumps 3 and 4, respectively. They are fed under pressure to a line mixer 5 where they are mixed to form an emulsion.

This emulsion is heated to 130 to 150 qo with a heater 6 and atomized into a furnace 8 from a burner 7. The virgin oil thus atomized is burned in the furnace 8. Also, there is a C at the rear of the furnace 8.
A 02 absorption tower 9 is provided, and combustion exhaust gas is passed through this by operating a damper. And from water tank 2 to pump 1
The water that has passed through the C02 absorption tower 9 is passed through the pump 2.
lead to. Using the CO2-containing water thus formed, military oil is combusted in the same manner as described above. and C0
2. Measure the average particle size of the generated fine particles at different emulsion temperatures and the dust concentration during combustion during absorption and non-absorption. The results are shown in Tables 1 and 2, respectively. table
1 (Average particle size) Table 2 (Soot and dust concentration) As can be seen from the above tables, CO2 absorption can significantly reduce the particle size of generated fine particles by 4.0 mm, especially in the low heating degree region, and also increase the amount of dust. can be reduced.

[Brief explanation of the drawing]

The drawing is a system diagram showing an embodiment of the present invention.

Claims (1)

[Claims] 1 The inside of a furnace where an emulsion is formed by mixing additives made of low boiling point liquids such as water and alcohol with materials to be combusted such as liquid fuel and combustible sludge, and the resulting emulsion is pressurized and then injected. A method of heating the emulsion to a temperature higher than the boiling point of the additive under pressure, and then injecting the heated emulsion under pressure into a combustion furnace to atomize the material to be combusted by the boiling phenomenon of the additive under reduced pressure. ,
Fine particles of liquid fuel, etc. characterized by bringing combustion exhaust gas into contact with an additive, absorbing carbon dioxide gas in the exhaust gas into the additive, and promoting a reduced pressure boiling phenomenon by using the obtained carbon dioxide gas-containing additive. method.