JPS6369579A - Cooling device for high-concentration coal-water slurry - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling device for high-temperature coal/water slurry, and is particularly suitable for cooling highly concentrated coal/water slurry whose temperature has increased due to the heat of grinding during wet grinding. Concerning a cooling device for the highly concentrated coal/water slurry used.

[Conventional technology] The conventional cooling device for high concentration coal/water slurry was
As described in the specification of No. 1-179636, by adjusting the filtrate supplied to the wet ball mill using a cooling device, the temperature of the highly concentrated coal/water slurry discharged from the wet ball mill is increased due to the heat of crushing. It is constructed in such a way that it can suppress the The coal is then supplied to a wet ball mill along with water and a dispersant, where it is wet-pulverized to produce a high-concentration coal/water slurry. This prevents adverse effects on the dispersion function of particles, and prevents coarse particles from settling and losing stability during storage of highly concentrated coal/water slurry.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional cooling device for high concentration coal/water slurry, the steam in the exhaust gas from the wet ball mill is condensed by heat exchange with cooling water using the cooling device. Since the water is cooled and then sent to the wet ball mill, there is a problem in that the configuration of the device and temperature control become complicated, and there is also a problem in that cooling water for the cooling device must also be secured. Furthermore, there may be restrictions on location for arranging the above-mentioned equipment.

The present invention solves these conventional problems,
In the wake of a wet ball mill used for the production of highly concentrated coal/water slurry, heat exchange with the air stream passes through a vibrating sieve to separate and remove coarse particles. The object of the present invention is to provide an excellent cooling device for high concentration coal/water slurry that can cool high concentration coal/water slurry whose temperature has increased.

[Means for Solving the Problems] In order to achieve the above object, the present invention has two opposing sides (air intake and An air exhaust port is provided respectively.

[Function] The present invention has the following effects due to the above configuration. That is, coal is supplied to a wet ball mill together with water and a dispersant, and is wet-pulverized. A high-concentration coal/water slurry whose temperature has been raised is discharged.

Subsequently, coarse particles are dispersed and removed in a vibrating sieve, and only the highly concentrated coal/water slurry consisting of fine particles passes through the sieves of the vibrating sieve and flows downward. At this time, the liquid flows down from substantially the entire sieve surface of the vibrating sieve, forming a large number of liquid columns, and in the cooling chamber, it comes into contact with the air flow flowing from the air intake port to the air discharge port, allowing direct heat exchange through cross flow. The heat is removed by
A highly concentrated coal/water slurry whose temperature has been lowered is obtained from the lower part of the cooling chamber and is supplied to the next process.

In this way, coarse particles can be separated and removed in the vibrating sieve, and at the same time, the highly concentrated coal/water slurry made of fine particles can be cooled.

[Example] 1 and 2 show an embodiment of the present invention.

In FIG. 1, 10 is a vibrating sieve, 12 is a sieve surface of the vibrating sieve 10, and 14 is an oscillator 1 for vibrating the sieve surface 12.
It is 4. 16 is a cooling chamber, the ceiling of the cooling chamber 16 is open and in contact with the outer periphery of the imaging sieve 10, and the side surface of the cooling chamber 16 is used for the flow of highly concentrated coal/water slurry passing through the sieving surface of the vibrating sieve 10. It is formed to surround the road. Cooling room 16
It has an opening 18 at the bottom for discharging the highly concentrated coal/water slurry.

FIG. 2 shows a cross-sectional view of a main part taken along the line A-A in FIG. 1.

In FIG. 2, the outer periphery of the lower edge of the vibration 1io is in contact with the ceiling of the cooling chamber 16 via the airtight material 19, and 17 and 17 are raised on opposite sides of the cooling chamber 16, and each side is filled with air. An inlet 20.20 and an air outlet 22.22 are respectively provided. 24.24 is the air outlet 22.
22.

Reference numerals 28 and 28 indicate air pipes, which are connected to a blower or the like. 26.26 is a damper for air adjustment. As the ventilation system operates, air flows through the air intake port 20.
The air flows in eight directions from 20, uniformly crosses the cooling chamber 16, and is discharged from the air outlet 22.22 through the air pipes 28.28 to the outside of the system.

30 shows a highly concentrated coal/water slurry containing wet-pulverized coarse particles, the coarse particles are separated and removed on the sieve surface 12 of the vibrating FJ10, and the high concentration coal/water slurry is made up of only fine particles that have passed through the sieve mesh of the sieve surface 12. The concentrated coal/water slurry 32 is configured to flow from the ceiling to the bottom of the cooling chamber 16.

Next, the operation of the above embodiment will be explained.

In the above embodiment, when the highly concentrated coal/water slurry 30 containing coarse particles that has been wet-pulverized and whose temperature has been raised is supplied to the vibrating sieve 10, the coarse particles are separated and removed while moving on the sieve surface 12, resulting in sieved souvenirs. Only the highly concentrated coal/water slurry 32 consisting of only fine particles passes through the sieve mesh of the sieve surface 12 and flows downward from the ceiling of the cooling chamber 16 to form a flow path. Sieve surface 12 of the vibrating sieve 10
On the other hand, the air flow from the air intake port 20.20 of the cooling chamber 16 to the air outlet port 22.22 is horizontal with a substantially uniform cross-sectional velocity. flow in the direction. Thus, highly concentrated coal/water slurry 3
Under the liquid column-shaped heat transfer surface of 2, direct contact with the air flow occurs through cross flow, and heat is removed from the highly concentrated coal/water slurry 32 by heat exchange under the temperature difference between the two. , aperture 1
The highly concentrated coal/water slurry 34 whose temperature has been lowered is discharged from 8 and supplied to the next process.

In this way, a high specific surface area is formed in the flow path of the high concentration coal/water slurry relative to the internal volume of the cooling chamber, so the heat exchange capacity of the cooling chamber is significantly increased, and the high concentration coal/water slurry is sufficiently cooled. be able to.

Therefore, the amount of air used for heat exchange can be reduced.

In the above embodiment, the cooling chamber is an empty tower, but it is possible to provide a shelf or the like inside the cooling chamber. In this case, the residence time of the highly concentrated coal/water slurry in the cooling chamber can be increased, and the above-mentioned heat exchange capacity can be further increased.

As described above, according to the above embodiment, the liquid column obtained by passing through a vibrating sieve for separating and removing coarse particles in the downstream of a wet ball mill used for producing a highly concentrated coal/water slurry. It has the effect of being able to cool the highly concentrated coal/water slurry whose temperature has risen due to crushing heat through heat exchange with the air flow in the flow path. Furthermore, according to the above embodiment, since air is used as the coolant, it is possible to omit securing cooling water for the water cooling device, which eliminates the need for complicating the device configuration and temperature adjustment. It can be resolved.

It goes without saying that the embodiments of the present invention are not limited to the above embodiments, and various embodiments can be adopted.

[Effect of the invention] As is clear from the above examples, the present invention
In the downstream of a wet ball mill used for the production of water slurry, the liquid passes through a vibrating sieve to separate and remove coarse particles, and heat exchanges with the air flow in the column-shaped flow path. This has the effect of being able to separate and remove coarse particles and cooling the highly concentrated coal/water slurry whose temperature has risen due to the heat of crushing.

Furthermore, according to the above embodiment, since air is used as the coolant, it is possible to omit securing cooling water for the water cooling device, which eliminates the need for complicating the device configuration and temperature adjustment. It has the remarkable effect of being able to eliminate the problem.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a cooling device for high concentration coal/water slurry according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the same device. 10... Vibration 1 16... Cooling chamber 20.
...Air intake port 22...Air outlet port 30...
・Highly concentrated coal/water slurry Applicant Kawasaki Heavy Industries, Ltd. Agent Patent attorney Yujibe Taka, 1st floor
i1 figure A

Claims (1)

[Claims] A high-concentration coal/water slurry characterized by having an air intake port and an air discharge port provided on opposite sides of a cooling chamber that surrounds the flow path of the high-concentration coal/water slurry passing through a vibrating sieve.
Water slurry cooling equipment.