JPS632649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water slag manufacturing equipment exhaust gas cleaning device that makes it possible to improve the working environment around the slag manufacturing equipment and prevent corrosion of surrounding equipment and buildings.

In blast furnaces, there are many slag production facilities that spray pressurized water on the molten blast furnace slag from the blast furnace to cool it and turn it into fine solid particles (slag). and a water tank where pressure water is temporarily stored, several dozen per ton of blast furnace slag.
Water vapor reaching up to Kg is generated, and this water vapor contains a large amount of sulfur dioxide gas due to sulfur in the slag, so an exhaust duct is usually installed above the water tank to prevent deterioration of the working environment and corrosion of peripheral equipment as much as possible. However, depending on the wind direction, the steam often flows around the blast furnace.
In addition, since it is only the natural draft force that draws the upper air steam into the duct and not the forced force of fans etc., if the amount of slag inflow increases temporarily or if hot metal gets mixed into the slag, steam will be generated. increases rapidly, and the increase in natural draft force is delayed, causing water vapor to blow out from the insertion part of the slag gutter into the aquarium.
There was also a risk of burns to nearby workers.

The present invention solves the above-mentioned drawbacks of the conventional equipment, and provides a water slag manufacturing equipment exhaust gas cleaning device that can improve the working environment around the slag manufacturing equipment and prevent corrosion of surrounding equipment and buildings. The gist is that in a slag production facility in which molten blast furnace slag is sprayed with pressure water using a blowing device to cool and atomize the slag, which is then introduced as slag into a slag tank via a slag gutter, the upper part of the slag tank is A duct consisting of an exhaust riser pipe, an exhaust downfall pipe, and a re-rise pipe are connected to each other through bent pipes, and a water spray nozzle for spraying chemical water is provided downward inside the exhaust downfall pipe. An exhaust gas purifying device for a water dregs production facility, characterized in that a water collecting box is provided at the lower part of a bent pipe connecting the water collecting box and the re-rising pipe, and a U-shaped pipe is attached to the lower part of the water collecting box.

Next, the present invention will be explained with reference to the drawings.

The drawing is a structural diagram of an embodiment of the present invention.

In the figure, first we will explain the slag production equipment.
The molten blast furnace slag transported from the blast furnace through the slag gutter 1 is sprayed with pressure water from the water supply pipe 10 connected to the blowing equipment water supply pipe 12 in the blowing device (pressure water nozzle) 3, It is cooled and solidified into fine particles (water slag), which are introduced into the water tank 4 together with pressure water. The water slag is transported from the water tank 4 in a mixed state with pressure water, and is dehydrated using a dehydration hopper or the like.
On the other hand, the separated water is again pressurized by the pump and sent to the water supply pipe 10.

The present invention provides the above-mentioned water slag manufacturing equipment with a duct 5 consisting of an exhaust rising pipe 5a, an exhaust descending pipe 5b, and a re-rising pipe 5c connected to the upper part of the water tank 4 through bent pipes, and the exhaust descending pipe 5b Sprinkle water supply pipe 2 is installed inside through the water supply pipe installation flange 13.
is provided, and a water sprinkling nozzle 6 is provided downward at the tip of the water sprinkling water supply pipe 2. Although the sprinkler water supply pipe 2 is branched from the blowing equipment water supply pipe 12 in the figure, it can also be connected to a separate system. Further, although the water spray nozzles 6 are arranged at the center of the exhaust downcomer pipe 5b in the figure, they may be arranged at equal pitches on the circumference near the inner wall of the exhaust downcomer pipe 5b. The number of water spray nozzles 6 may be one or two or more. This water supply pipe 2 has chemical injection equipment 1.
1 is connected and injects sulfite neutralization solution, etc. Further, a water collection box 7 is provided at the lower part of the bent pipe connecting the exhaust descending pipe 5b and the re-rising pipe 5c,
A U-shaped pipe 8 connected to the water tank 4 is provided at the bottom of the water collection box 7. This U-shaped pipe 8 can also be connected to another drainage system. It goes without saying that the U-shaped pipe 8 is provided so that the top thereof is below the attachment point of the drain box 7 to the bent pipe connecting the exhaust descending pipe 5b and the re-rising pipe 5c.

Next, the effects of the above configuration will be described. Steam generated by blowing pressure water onto the molten blast furnace slag in the blowing device 3 is attracted by the pressure water, enters the water tank 4, ascends the exhaust rising pipe 5a together with the water vapor generated inside the water tank 4, and ascends the exhaust down pipe 5b. to go into. Here, the water vapor is captured by thin water droplets of chemically sprayed water sprayed downward from the water spray nozzle 6, and sulfur dioxide gas etc. in the water vapor are neutralized by the chemical solution mixed in the sprayed water. Thus, the water vapor captured by the water droplets flows down and accumulates in the water collection box 7 at the lower part of the exhaust downcomer pipe 5b, together with neutralized sulfur dioxide gas and the like. The water collected in the water collecting box 7 flows down into the water tank 4 through the U-shaped pipe 8 while overflowing. The flow of water vapor is attracted by the energy of the spray water sprayed downward from the water spray nozzle 6 while passing through the exhaust downcomer pipe 5b, that is, the draft force is enhanced by the ejector effect of the spray water. , force duct 5
more excreted.

The effects of the present invention are as follows.

(1) It neutralizes and removes water vapor containing sulfur dioxide gas, etc., which improves the surrounding working environment.

(2) Corrosion of surrounding equipment, buildings, etc. can be prevented.

(3) Since draft can be forced, the height of the duct can be lowered.

(4) The amount of water vapor blown out from the slag gutter insertion part of the aquarium is significantly reduced.

(5) The slag blowing device in the slag gutter can be clearly observed.

As described above, the present invention provides a water slag manufacturing equipment exhaust purifying device that improves the working environment around the slag manufacturing equipment and prevents corrosion of peripheral equipment and buildings. Extremely useful.

[Brief explanation of the drawing]

The drawing is a structural diagram of an embodiment of the present invention. In the figure, 1... slag gutter, 2... water supply pipe,
3... blowing device (pressure water nozzle), 4... water tank,
5... Duct, 5a... Exhaust rising pipe, 5b... Exhaust descending pipe, 5c... Re-rising pipe, 6... Water nozzle 7... Water collection box, 8... U-shaped pipe, 9... Water slag Gutter, 10... Water supply pipe, 11... Chemical injection equipment, 12...
... Blowing equipment water supply pipe, 13... Sprinkling water supply pipe mounting flange.

Claims (1)

[Claims] 1. In a slag production facility in which molten blast furnace slag is cooled and atomized by spraying pressure water with a blowing device and introduced into a water tank via a slag trough as a slag, each pipe is connected to the top of the water tank through a bent pipe. A duct consisting of an exhaust ascending pipe, an exhaust downcomer pipe, and a re-rising pipe is provided, and a water nozzle for spraying water is provided downward in the inside of the exhaust descending pipe, and the exhaust descending pipe and the re-rising pipe are connected to each other. 1. An exhaust gas cleaning device for a water dregs production facility, characterized in that a water collection box is provided at the bottom of a bent pipe connecting the water collection box, and a U-shaped pipe is attached to the bottom of the water collection box.