JPS58224901A - Drain device of rainwater in material yard - Google Patents

Abstract

PURPOSE:To hold water in a storage material stably to a low level, by constituting a device such that a collective water groove 2 with a cover having holes is provided through a filter layer to the surface of the earth in a maximum land subsidence part of an outdoor storage for an ore or the like in the steel industry and successively provided to drain water pipes through a drain water pump pit and concurrently precipitation tank. CONSTITUTION:A tank 4 used both for collecting water and precipitation with a cover 8 having holes is arranged in a maximum land subsidence part in a coal yard, and drain water pumps 5 and drain water pipes 6 are connected, then the tank is covered by a filter layer 7 constituted by a rubble layer. By this constitution, water in the yard flows in through the filter layer 7 and is collected to the tank 4 used both for collecting water and precipitation, and an inflow of mud is inhibited by partitioning plates 10 while an inflow of only water is permitted into precipitation tanks 11, then the water is discharged by the pumps 5 and the drain pipes 6. In this constitution, water in a storage material is held to a low level, and a slide of the material is prevented, then stable quality and an original thermal unit in each process can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an outdoor storage facility for ore, coal, etc. in the steel industry.
This is related to Yardoff's rainwater drainage system YC, which continuously drains the storage area formed at the maximum subsidence part of the yard due to the rainwater that occurs naturally and unavoidably. Improved flooding conditions, prevented yard loads from collapsing, and damage to yard equipment.
The present invention provides a device that both prevents moisture content from rising in coal and indirectly prevents the next process, the blast furnace, from being shut down.

Due to the recent expansion in demand for steel and the rationalization of the ironmaking process,
As the size of the blast furnace increases and the rate of reaction within the blast furnace increases, it is desired that the raw material ore fuel in the blast furnace be stably, smoothly, and constantly supplied to reduce pig iron. It is necessary that the required quantities of raw material ore and fuel coke can be stably supplied, and that their quality is also stable. If the raw material ore and fuel coke for the blast furnace cannot be supplied, the operation of the blast furnace will have to be halted, and if raw material ore, stone and fuel coke of poor quality are charged, the distribution of raw materials in the furnace will be affected. Ventilation resistance, segregation of heat blood, and poor ventilation occur, and the shedding inside the furnace decreases and becomes uneven, which causes Vcf! When l = the reaction within the furnace becomes non-uniform, resulting in an unfavorable situation. The blast furnace raw materials are so-called sintered ores, pellets, or lumps, which are obtained by sintering powdered ores such as fine ores.
, stone, and coke produced by dry distillation of coal are used as fuel, or the powdered ore, pellets, lump ore, and coal are stored in outdoor storage yards (yards). The ground surface of this yard (hereinafter referred to as G and L) sinks over time due to the weight of the cargo, and is approximately one inch lower than G L around the yard. For this reason, in the case of rain, especially heavy rain, the entire yard can become flooded in an instant, and the moisture in the cargo becomes saturated, causing the cargo to collapse, covering the track bed of the yard moving machine, and making it impossible for the moving machine to move or damaging the equipment. Kameru. In this case, ore.

As it became impossible to send coal from the yard, the sintering factory ceased operations, the coke oven likewise ceased production, and it became impossible to bank dry-distilled cortus, and the blast furnace ceased operation. 10 Production becomes impossible.

In addition, there are 5 to 20 different brands of raw materials used in the sintering furnace and coke oven, respectively.
By maintaining a constant blend over a long period of time, raw materials of a specified quality can be stably supplied. This blending accuracy is determined by the accuracy of the amount of blending punch, and since fluctuations in adhering moisture greatly affect the actual blending accuracy, it is desirable to keep the adhering moisture as low as possible.

On the other hand, moisture in the raw materials is a problem in blast furnaces and sintering furnaces.

This requires an additional amount of heat for evaporation in the coke oven, increasing the manufacturing cost of the finished product. For this reason, rainwater in the yard, which is a cause of fluctuations in moisture in raw materials, should be drained quickly and accurately, and measures should be taken to prevent piles of cargo from collapsing at any time to reduce moisture adhering to raw material ore (1 coal). An ink that can reduce the amount of waste as much as possible and stably supply raw materials is desired.

Conventionally, for the purpose of collecting ink from the rainwater in the yard, drain pipes were buried, strata, and side gutters were installed around the yard, or raw material ore (two stones) were poured into pipes. Or, due to clogged ditches and ground subsidence, 4
The original drainage function is often lost due to the disappearance of the downstream slope or siltation, which has the drawback of requiring a great deal of cost and effort to restore. In order to correct this,
It was necessary to invest a huge amount of money to repair the Yard G-L'i.

The present invention aims to solve the above-mentioned drawbacks by draining rainwater inside the yard to the outside of the yard stably and quickly over a long period of time.
This completely prevents flooding and landslides of the loaded raw material ore, nine coals, and guarantees equipment operation.It also stabilizes the moisture content of the raw material at a low level, stabilizing the quality of sintered ore and coke, which can be used in the next process. It is not a measure to reduce thermoelectricity,
The aim is to ensure stable operation of blast furnaces.

That is, the present invention provides a water collection groove with a perforated lid through one layer of filters in the yard, and also provides drainage ribbon teeth at both ends of the water collection groove, so that the drain pipe can be connected to the drainage basin in the P9T run. This is a rainwater drainage system for a raw material yard that is characterized by leading conflicts. Next, an embodiment of the present invention will be described.

Figure 1 shows 90<Generally, iron ore 1 coal is stored in the raw material 8 coal yard is the trackbed of the yard moving machine], yard 2
．． A rainwater drainage pond 3 is constructed, and in the present invention, a water collection/settling tank 4 with a perforated lid 8 provided with permeable holes 9 through a filter layer 7 made of a layer of crushed stone is installed at the largest point in the yard. It was installed in a subsidence area, and a drainage pump 5 and a dedicated drainage pipe 6 connected to the pump 5 were provided.

FIG. 2 schematically shows the water collection/sedimentation tank 4 with a perforated lid 8, and is a cross section taken along line A-A' in FIG.

FIG. 3 schematically shows the arrangement of the bottle 1 bit and settling cypress 11 and the pump 5, and shows the B-FfFlr plane of FIG. 1. 10 prevents the inflow of sludge. As an example of the effect, the number of coal pile collapses before and after installing the mountain water drainage system of the present invention is shown in Figure 4.

゛Also, Figure 5 shows the changes in the moisture content of the coal sent from the yard. Figure 6 shows the ultimate unit of heat in a coke oven. As you can see, the moisture content of the coal is 0.3 liters. As a result, the unit heat consumption of the coke oven is 4500 Kc.
An improvement in al/l 7 tears was observed.

As explained above in detail, according to the present invention, it is possible to stabilize the moisture content of raw materials stored in the yard at a low level, and prevent the collapse of raw materials such as sintered ore and coke, resulting in stable quality and reduced heat consumption in each process. An excellent effect can be obtained that not only significantly improves the basic unit but also ensures stable blast furnace operation.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the planar arrangement of the rainwater drainage system in the yard of the present invention. Fig. 2 is a graph showing the number of times (years) of coal slumping in yard A in Fig. 1. Figure 5 shows the moisture content of coal sent from the yard before and after the measures taken by the present invention.
) Graph shown in Figure 7 is a graph showing the improvement formula after taking measures to reduce the heat consumption rate in a coke oven due to a decrease in coal moisture percentage. It is a graph showing an improvement formula for levels and variations before and after countermeasures. l...Yard moving machine roadbed 2...Yard 3...Drainage pond 4...Water collection/sedimentation tank 5...Drain pump 6. ... Drainage pipe 7 ... Filter single layer 8 ... Perforated lid 9 ... Water permeability hole 10 ... Partition plate 11 ... Sedimentation tank exit Applicant Nippon Steel Corporation Figure 2 Figure 3 Section 4vA Hall Figure 5

Claims (1)

[Claims] A water collection trench with a perforated lid is installed with a single layer of filters in the ground at least in the area of maximum ground subsidence of an outdoor storage yard (yard) for raw materials such as ore 1 and coal, and a drain pump bit is installed at both ends of the water collection trench. A rainwater drainage system for a raw material yard, in which a sedimentation tank is installed in series, a pump capable of storing rainwater in the pit is installed, and a drainage pipe is connected to the pump.