JPH0228385B2 - KONODOSEKITAN * MIZUSURARIINOREIKYAKUSOCHI - Google Patents

Description

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

[Conventional technology] Conventional cooling equipment for high concentration coal/water slurry is
As described in Japanese Patent Application No. 61-179636, by adjusting the water supplied to the wet ball mill using a cooling device, the crushing heat of the highly concentrated coal/water slurry discharged from the wet ball mill can be reduced. The structure is configured to suppress temperature rise due to 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 the dispersion function of the particles from being adversely affected, and also prevents coarse particles from settling and losing stability during storage of the 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 the temperature adjustment become complicated, and there is also the problem that cooling water for the cooling device must be secured. Furthermore, there have been some restrictions regarding the location of the above-mentioned equipment.

The present invention solves these conventional problems, and is intended to pass through a vibrating sieve for separating and removing coarse particles in the downstream of a wet ball mill used for producing highly concentrated coal/water slurry. The purpose 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 due to crushing heat through heat exchange with air flow in the die flow path. It is something.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides air intake holes 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, where it is wet-pulverized and 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 outlet, allowing direct heat exchange through cross flow. The heat is removed by this process, and 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 screen, and 12
is a sieve surface of the vibrating sieve 10, and 14 is an oscillator 14 for vibrating the sieve surface 12. Reference numeral 16 is a cooling chamber, and the ceiling of the cooling chamber 16 is opened to accommodate the vibrating sieve 10.
The side surface of the cooling chamber 16 is formed so as to surround the flow path of the highly concentrated coal/water slurry passing through the sieve surface of the vibrating sieve 10. An opening 18 is provided at the bottom of the cooling chamber 16, and is an opening 18 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 vibrating screen 10 is in contact with the ceiling of the cooling chamber 16 via the airtight material 19, and
Reference numerals 7 and 17 denote opposite side surfaces of the cooling chamber 16, and air intake ports 20 and 20 and air discharge ports 22 and 22 are provided on each side surface, respectively. Reference numerals 24 and 24 indicate current plates provided at the air exhaust ports 22 and 22.

Reference numerals 28 and 28 indicate air pipes, which are connected to a blower or the like. 26, 26 are dampers for adjusting the amount of air. As the ventilation system operates, air flows from the air intake ports 20, 20 in the direction B, uniformly crosses the cooling chamber 16, passes through the air pipes 28, 28 from the air exhaust ports 22, 22, and is discharged to the outside of the system.

30 indicates a highly concentrated coal/water slurry containing wet-pulverized coarse particles;
Coarse particles are separated and removed at the top, and a highly concentrated coal/water slurry 32 made up of only fine particles that have passed through the sieve mesh of the sieve surface 12 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, the highly concentrated coal/water slurry 30 contains coarse particles that have been wet-pulverized and heated to an elevated temperature.
When coal is supplied to the vibrating sieve 10, coarse particles are separated and removed while moving on the sieve surface 12 and discharged as a sieve product. Only the water slurry 32 is passed through and flows downward from the ceiling of the cooling chamber 16 to form a flow path. At this time, the sieve surface 12 of the vibrating sieve 10
On the other hand, the air flows horizontally from the air intakes 20, 20 of the cooling chamber 16 to the air outlets 22, 22 with a substantially uniform cross-sectional velocity. flow in the direction. Thus,
Under the liquid column-shaped heat transfer surface of the high concentration coal/water slurry 32, direct contact with the air flow occurs through cross flow, and due to the temperature difference between the two, the high concentration coal/water slurry 32 is heated through heat exchange. 32 is heat removed and the opening 18
Highly concentrated coal/water slurry 3 whose temperature has been lowered from
4 is discharged 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, making it possible to sufficiently cool the high concentration coal/water slurry. Can be done. 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.

[Effects of the Invention] As is clear from the above examples, the present invention provides a method for producing highly concentrated coal/water slurry through a vibrating sieve for separating and removing coarse particles in the wake of a wet ball mill used for producing highly concentrated coal/water slurry. It is designed to exchange heat with the air flow in the column-shaped flow path of the liquid obtained by
This has the effect of cooling 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 drawings]

Figure 1 shows high concentration coal according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a water slurry cooling device, and FIG. 2 is a sectional view of a main part of the device. 10... vibrating sieve, 16... cooling chamber, 20... air intake, 22... air outlet, 30... highly concentrated coal/water slurry.

Claims (1)

[Claims] 1. A highly concentrated coal/water slurry characterized in that an air intake port and an air outlet are provided on opposite sides of a cooling chamber that surrounds the flow path of the highly concentrated coal/water slurry passing through a vibrating sieve. Cooling system.