JPS59109587A - Equipment for drying, preheating and carrying charged coal - Google Patents

Abstract

PURPOSE:To dispense with carriers such as chain conveyer and reduce the cost of construction and maintenance, by installing an inclined column for preheating charged coal with hot air stream running from a combustion oven up to a storage tank at the top of a coke oven. CONSTITUTION:An inclined column 22 is installed from a combustion oven 6 up to the top of a preheated coal storage tank 24. Wet coal supplied into the inclined column 22 from a feeder 21 is preheated while it is carried by hot air blown up from the conbustion oven 6 and is collected by a cyclon 25 for discharge into the coal storage tank 24 located just under the inclined column 20 (10 refers to a coke oven). Provided at the middle of the inclined column 20 is a mixing and diffusing unit 23 which has a spiral guide plate 23' installed in an air-tight step structure in such a way that the extended line of the lower column is above the extended line of the upper column so that mixing and diffusion of deflected stream of slack coal may be expedited and heat exchange between the hot air stream and the slack coal may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for drying, preheating and transporting coke oven coal.

Conventional equipment for drying, preheating, and transporting coal charged in a coke oven will be explained using FIG. 1.

A vertical column 1 is erected at a location away from the coke oven 10,
From the bottom, differentiated coal is fed into the column 1 by the wet coal feeder 2, and the wet coal is dried and preheated in a hot air flow. The preheated charged coal is collected by a cyclone 3 placed at the top exit side of the column. The collected preheated coal is transported by a closed horizontal and inclined chain conveyor 4 to a preheated coal storage tank 5 placed in the coke oven 10 soil.

The hot air flow used for drying and preheating the wet coal is produced by burning CO gas or mixed gas in a combustion furnace 6, and is sucked and blown into the column 1 by an exhaust fan 7.

The low-temperature exhaust gas after the cyclone 3 is removed by a dust collector 8 and then released into the atmosphere.

A part of the exhaust gas is sent to the outlet side of the combustion furnace 6 through the return pipe 9, and is further used for temperature adjustment of the hot gas at the column 1 side inlet. However, the structures supporting the vertical columns, cyclones, etc. are highly structured and heavy, and the horizontal and inclined chain conveyors are expensive and require high maintenance costs due to regular replacement of worn parts.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dry preheating transportation facility for coal charged in a coke oven that eliminates the conventional problems and has low construction costs, low coal transportation power costs, and low maintenance costs.

The gist of this is that the column for hot air drying and preheating the charged coal is laid down in an inclined manner from the combustion furnace directly to the storage tank above the coke oven, where the preheated coal is transported, thereby eliminating the need for transport equipment such as chain conveyors. This eliminates the need for heavy supporting structures such as columns, which were required for vertical columns, and improves thermal efficiency by installing a mixing and diffusion structure for pulverized coal and hot air flow at one or more locations in the middle. By adopting a simple facility structure, construction and maintenance costs were reduced.

The present invention will be explained below based on the embodiment shown in the drawings.

FIG. 2 is an overall view of an apparatus for drying and preheating coke-charging coal, which is an embodiment of the present invention, in which an inclined column has the function of transporting coal to a coal storage tank.

The wet coal is fed into the inclined column 22 by the wet coal supply TA21, is roared by the rising hot air current, and is dried while being transported in gas to the preheated coal storage tank 24 installed above the coke oven 10. Preheated.

The dry and preheated charged coal is collected by a cyclone 25 installed above the coal storage tank 24 and discharged to the coal storage tank 24 directly below.

In the middle part of the inclined column 20, hot air flow is installed at one or more places in order to prevent the pulverized coal in the column from drifting toward the inner wall surface of the column tube and to prevent the heat exchange efficiency between hot gas and coal from decreasing compared to a vertical column. A pulverized coal mixing and diffusion structure 23 is provided.

Figure 3 shows an enlarged view.

The middle part of the inclined column 22 is made into an airtight facility structure by placing the extension line of the lower column over the extension line of the upper column. A guide plate 23' is spirally attached to the inner surface of this stepped structure.

With this structure, when the pulverized coal 26 passes through the mixing and diffusion structure 23, the pulverized coal advances on the upper part of the inner surface of the upper column due to its penetration, and the hot air flow is guided through the spiral path by the guide plate 23'. and thread it from the top of the lower column to the bottom of the upper column.

In this way, mixing and diffusion of the pulverized coal drift is achieved, and the heat exchange rate is increased. Note that this mixed diffusion structure is
The heat exchange rate may be increased by forming one or more locations into a spiral shape to impart spiral motion to the pulverized coal 26 and the hot air flow.

In addition, abrasion-resistant material is attached to key points within the column to avoid repairs due to wear as much as possible.

FIG. 4 shows an elevational view of a preheating drying transportation facility for coal grains including a coke oven. Here, the preheated coal storage tank 24 and the inclined column 22 are supported by the same support groove, but they may be supported independently.

However, in order to reduce the weight of the structure, it is desirable to use the support structure for the coal storage tank and the inclined column.

The present invention eliminates the need for transportation means such as inclined conveyors and heavy structures supporting vertical columns, which were previously required, thereby significantly reducing construction and maintenance costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the conventional equipment, and Fig. 2 is a schematic diagram showing the conventional equipment.
3 is an enlarged view of the mixing and diffusion structure in the middle part of the inclined column, (a) is a side view, (b) is a plan view, and FIG. 4 is a diagram showing the drying and preheating of powdered coal including a coke oven. FIG. 2 is an overall view of the transportation device. 1.Vertical column 2..Wet coal feeder 3..Cyclone 4..Chain conveyor 5..Preheated coal storage tank 6..Combustion furnace 7..Blower fan 8..
・Dust collector 9... Return pipe 10 River coke oven 2
1... Wet coal feeder 22... Inclined column 23... Mixing diffusion structure 23'... Guide plate 24... Preheated coal storage tank
25 Sa・f Chron 26... Powdered coal 27...
Extruder 28...Guide car shore 1) Forward, ・'1°-H:

Claims (1)

[Claims] A column for drying and preheating transport of wet coal is installed at an angle from a wet coal supply hopper to a position above a storage tank for preheating coal on the furnace,
A dry preheating transport device for coal charged in a coke oven, characterized in that one or more mixing and diffusion structures are provided in the middle of the column.