KR20170072076A

KR20170072076A - Coal dry apparatus

Info

Publication number: KR20170072076A
Application number: KR1020150180476A
Authority: KR
Inventors: 김경훈; 김병일; 한진미; 문기현; 최재혁; 박경태
Original assignee: 주식회사 포스코
Priority date: 2015-12-16
Filing date: 2015-12-16
Publication date: 2017-06-26

Abstract

The apparatus for drying coal according to an embodiment of the present invention includes a water coal supply unit for supplying water-containing coal, a coke oven for making coke, and a coke oven connected to the water coal supply unit, A screw dryer, and a briquette maker for making a blasted coal from the pulverized coal separated in the fluidized screw dryer, wherein the fluidized screw dryer dries the moisture coal from the coke oven.

Description

[0001] COAL DRY APPARATUS [0002]

The present invention relates to a coal drying apparatus.

Coke is needed as a heat source and a reducing agent in a steelmaking blast furnace process that produces molten iron from iron ore. Coke is a solid containing 87% to 88% of carbon, which is produced by charging coal into a coke oven and shutting off the air and heating it by external heat. Coal is divided into anthracite, bituminous coal, bituminous coal, and lignite depending on its grade, and bituminous coal is mainly used for coking coal. Recently, it has been required to increase the use of low-grade coal such as lignite and bituminous coal, which have abundant reserves, in order to reduce the cost due to the enlargement of the blast furnace. Qualitative improvements are needed to utilize low grade coal as a fuel resource in the blast furnace process. For this purpose, it is possible to improve the quality of the coke by reducing the water content of the charged coal and increasing the charging density or by homogenizing the carbonization.

As a generally used drying method, there is a rotary kiln drying method or a fluidized bed drying method. However, the rotating furnace drying method requires a lot of space for installation, and a sealing technique between the driving part and the fixing part of the drying apparatus is required. In the fluidized bed drying method, heat transfer efficiency is high during coal drying but it is difficult to control the degree of drying and the amount of treatment.

An embodiment of the present invention is to provide a coal drying apparatus capable of efficiently and economically drying coal.

Wherein the briquette forming machine comprises a cyclone in which pulverized coal separated from the fluidized screw dryer is drawn in, a dust collector collecting the first pulverized coal not filtered by the cyclone, a mixer for mixing the second pulverized coal filtered by the cyclone and the third pulverized coal filtered by the dust collector, And a molding machine in which the fourth pulverized coal passed through the mixer is drawn and molded into the molded coal.

The moisture content of the dried coal produced in the distribution screw drier may be 1.5 wt% to 7 wt%.

The briquette forming machine may further include a binder for coupling the second pulverized coal and the third pulverized coal to the mixer.

The fluidized screw dryer includes a chamber filled with the water coal, and a plurality of screws installed in the chamber and rotating, and the inlet and outlet of the water coal can be controlled according to the rotation of the screw.

The coal drying apparatus according to an embodiment of the present invention can efficiently and economically dry coal by recycling waste gas generated in the coke oven and producing dry coal in a drier screw dryer.

In addition, pulverized coal is used as a raw material for a coke oven by being made into a molded coal in a molded coal producing machine, which is advantageous from the viewpoint of resource recycling.

1 is a schematic view of a coal drying apparatus according to an embodiment of the present invention.
2 is a view for explaining a phenomenon in which pulverized coal is generated in a fluid-screw dryer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Hereinafter, a coal drying apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a schematic view of a coal drying apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the coal drying apparatus according to one embodiment of the present invention includes a water coal supply unit 100, a drier screw dryer 200, and a briquette maker 300.

The water coal supply part (100) supplies the water coal (10) containing moisture to the drier screw dryer. The moisture coal 10 may be a lignite, a bituminous or a mixture thereof. The water content of the water coal 10 is 7 wt% to 12 wt%.

The fluidized screw dryer 200 is connected to a coke oven 400 and a moisture coal feeder 100 to produce a coke. Therefore, the waste gas 2 generated in the coke oven 400 and the water coal 10 drawn out from the water coal feeder 100 are supplied to the drier 200.

The fluidized screw dryer 200 includes a chamber 210 filled with the water coal 10, a plurality of screws 220 installed at the lower end of the chamber 210 and rotating, and a waste gas 2 introduced into the chamber 210 And a waste gas supply pipe 230 for supplying the moisture coal 10 by fluidizing and drying it.

The plurality of screws 220 control the intake and discharge of the water coal 10 while rotating. By controlling the rotation speed of the screw 220, the drying speed of the water coal 10 can be adjusted.

Since the waste gas supply pipe 230 is installed at the lower end of the chamber 210, the waste gas 2 supplied from the lower end of the chamber 210 is supplied to the water coal 10 to fluidize the water coal 10, The coal 30 can be made. The temperature of the waste gas 92 is 120 degrees to 300 degrees, so that the water coal 10 can be dried easily.

At this time, the pulverized coal 4 separated from the moisture coal 10 is moved upward by the particle size difference, and the dried coal 30 is moved downward and classified.

The moisture content of the dried coal 30 may be 1.5 wt% to 7 wt%. Thus, by producing the dried coal 30 in the fluidized screw drying apparatus by recycling the waste gas generated in the coke oven, it is possible to efficiently and economically dry the coal.

2 is a view for explaining a phenomenon in which pulverized coal is generated in a fluid-screw dryer.

As shown in FIG. 2, the water coal 10 has a structure in which the pulverized coal 40 is attached to the surface of the dried coal 30 together with the water 1. The moisture coal 10 is separated from the dry coal 30 as the moisture 1 is removed from the drier 200. Thus, the dried coal 30 and the pulverized coal 40 are produced in the fluidized screw dryer 200.

The briquette making machine 300 forms the briquettes 90 from the pulverized coal 40 separated from the fluidized screw dryer 200.

The briquette making machine 300 includes a cyclone 310, a dust collector 320, a mixer 330, a binder 340, and a molding machine 350.

The pulverized coal 40 separated from the fluidized screw dryer 200 is introduced into the cyclone 310. The cyclone 310 separates the pulverized coal 40 by centrifugal separation to form the second pulverized coal 60. The particle size of the second pulverized coal 60 may be 0.15 mm or less. The first pulverized coal 50 not filtered by the cyclone 310 is collected again by the dust collector 320. And the third pulverized coal 70 is formed by filtering the first pulverized coal 50 at the dust collector 320. The particle size of the third pulverized coal 70 may be 0.15 mm or less.

The binder 340 binds the second pulverized coal 60 filtered by the cyclone 310 and the third pulverized coal 70 filtered by the dust collector 320 and the mixer 350 combines the second pulverized coal 60 The pulverized coal 60 and the third pulverized coal 70 are mixed with each other.

Then, the fourth pulverized coal 80 passing through the mixer 350 is drawn in the molding machine 350, and is molded into the molded coal 90.

The molding machine 350 includes two rolls 351 disposed opposite to each other and rotated, a hopper 352 disposed above the roll 351, and a press-fitting screw 352 installed in the hopper 352. The specific configuration of the molding machine 350 is not particularly limited.

The fourth pulverized coal 80 injected into the molding machine 350 from the mixer 350 is press-molded while passing between the rolls 351 of the molding machine 350 to be molded into a predetermined shape of the shaped coal 90.

The dried coal 30 produced in the fluid screw drier 200 and the shaped coal 90 made in the molding machine 350 are transferred to the coke oven 400 to produce coke.

As described above, by drying the coal in the drier using the waste gas generated in the coke oven 400, the coal can be efficiently and economically dried.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the following claims. Those who are engaged in the technology field will understand easily.

10: Moist coal 30: Dry coal
40: Pulverized coal 100: Moisture coal supply part
200: fluidized screw dryer 300:

Claims

A moisture coal supply part for supplying water-containing water coal,
A fluidized screw dryer connected to the coke oven for making the coke and the moisture coal feeder to dry the moisture coal to produce dry coal,
The briquette forming machine for making the pulverized coal from the pulverized coal separated in the fluidized-
Lt; / RTI >
Wherein the fluidized screw dryer dries the moisture coal from the coke oven.

The method of claim 1,
The above-
A cyclone in which pulverized coal separated from the fluidized screw dryer is introduced,
A dust collector for collecting the first pulverized coal not filtered by the cyclone,
A mixer for mixing the second pulverized coal filtered by the cyclone and the third pulverized coal filtered by the dust collector,
And the fourth pulverized coal passed through the mixer is drawn into a molding machine
And a drying unit for drying the coal.

The method of claim 1,
Wherein the moisture content of the dried coal produced in the distribution screw dryer is 1.5 wt% to 7 wt%.

3. The method of claim 2,
Wherein the briquette forming machine further comprises a binder which combines the second pulverized coal and the third pulverized coal and sends the combined pulverized coal to the mixer.

The method of claim 1,
The fluidized screw dryer
A chamber in which the water coal is filled, and
A plurality of screws installed in the chamber,
Lt; / RTI >
And controls the intake and discharge of the water coal according to the rotation of the screw.