JPS6138363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transporting a mixture of coal granules and petroleum as a slurry and then combusting it.

BACKGROUND OF THE INVENTION Recently, from the viewpoint of effective transportation and effective use of coal, a mixed fuel made by adding petroleum to fine coal particles and making a slurry has been attracting attention. However, since our country imports petroleum, there is a strong need to reduce the amount of petroleum used as much as possible. To achieve this, it is necessary to have a high oil removal rate, that is, a high oil recovery rate, but on the other hand, it is necessary to make the coal as fine as possible for combustion. However, as the coal becomes more atomized, its total surface area increases significantly, which means that oil adheres to these fine particles and reduces the oil recovery rate, and there are many opportunities for the pulverized coal to become colloidal, so oil recovery is difficult. It becomes even more difficult.

The object of the invention is to propose a method for increasing the recovery rate of oil from a mixture of coal granules and oil, while also rendering the deoiled coal in a shape suitable for combustion.

In short, this invention is a method in which the particle size of fine coal particles is approximately 10 mm or less and 1 mm or more when transported as a slurry, and the deoiled coal after deoiling is pulverized near a combustion device and then supplied to the combustion device and combusted. It is characterized by

The invention will be explained with reference to the accompanying drawings. 1st
The figure is a block diagram showing a conventional method. Coal is crushed into fine particles with a diameter of 1 mm or less in a pulverizer 1a, and oil is supplied from an oil storage tank 2a to form a slurry, which is sent to the vicinity of the boiler etc. through a pipe 3a. The oil is transported and supplied to the deoiling device 4a. Separated and recovered oil is stored in storage tank 5.
The deoiled coal is sent to a burner device 7a by a fuel supply device 6a and burned in a furnace.

In this invention, as shown in the block diagram of FIG. 2, coal is coarsely pulverized in a coarse pulverizer 8 to a particle size of approximately 10 mm or less and 1 mm or more. This particle size was selected from the viewpoint of the wear of the pipes, the convenience of slurry formation and transportation, and more importantly, the conditions that oil separation would be sufficiently performed. Then, petroleum is supplied from the petroleum storage tank 2 to a pipe line 3 and transported as a slurry to a deoiling apparatus 4 which is located a considerable distance away. Separated and recovered oil is stored in storage tank 5.
Coarse coal is sent to the pulverizer 1 by a transportation device 6. Since the petroleum content of the supplied coarse coal is less than a few percent (weight ratio), it becomes smooth and suitable for being pulverized by a pulverizer. This pulverizer (mill) pulverizes the amount of 200 mesh that passes through, which is suitable for pulverized coal combustion, to approximately 70%. The pulverized deoiled coal is sent to the burner device 7 by a normal air transport means and burned in the furnace.

The purpose of setting the diameter of the fine coal particles to approximately 10 mm or less and 1 mm or more is that it is within a range suitable for slurry transportation and suitable for crushing after oil separation. On the other hand, when the lumps of coal are crushed to this extent during slurry transportation, the particle size distribution is suitable for reducing friction with the transportation pipe.

In addition, it is preferable to use a filter to separate petroleum and coal particles using centrifugal force, and if the perforated plate used in the filter has a pore diameter of about 0.9 mm, clogging will be less likely, so the particle size can be adjusted to approximately 0.9 mm. The diameter was selected to be 1 mm or more. Note that the separated petroleum after slurry transportation inevitably contains fine coal particles including micron-sized fine powder. This is the coal particle size distribution that contributes to frictional resistance in slurry transportation. Ultimately, this oil can be used as a fuel for pulverized coal-containing oil.

By implementing the method according to this invention,
By forming coarse particles of approximately 10 mm to 1 mm, which are suitable for slurry transportation, the deoiling effect is significantly increased, and oil is recovered optimally. Moreover, by using a pulverizer, coarse coal is converted into pulverized coal, which is This has various effects such as facilitating combustion in combustion devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a system of a conventional pulverized coal combustion device, and FIG. 2 is a block diagram showing a system of a deoiled coal combustion device according to the present invention. 1...Fine crusher, 2...Oil storage tank, 3...Pipe line, 4...Oil removal device, 5...Storage tank, 6...Transport device, 7...Burner device, 8...Coarse crusher.

Claims (1)

[Claims] 1. A method in which crushed coal fine particles and petroleum are mixed and transported as a slurry, and after oil removal is burned, the coal particle size is made to be approximately 10 mm or less and 1 mm or more, and petroleum is added to the mixture and transported as a slurry, A deoiled coal combustion method characterized by separating and recovering oil in a deoiling device, pulverizing the deoiled coal into fine powder, and then burning it. 2 The amount of pulverization of deoiled coal is reduced to approximately 200 mesh.
The method for burning deoiled coal according to claim 1, characterized in that the oil-free coal combustion method is reduced to about 70%.