JPH0210344B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for stirring exhaust gas generated from a steel manufacturing plant such as a converter facility, a hot metal pretreatment plant, etc. in order to completely burn the exhaust gas.

In steelmaking plants, pre-treatment plants, etc., except for equipment that recovers exhaust gas without combusting it, it is necessary for safety reasons to completely combust the CO gas generated and collect the dust. It is.

However, due to the high temperature and high viscosity of exhaust gas, complete combustion is extremely difficult.

The present invention was made to solve this problem, and efficiently stirs exhaust gas and excess air.
It is an object of the present invention to provide a gas agitation device for complete combustion of exhaust gas in steel manufacturing plants, pretreatment plants, etc., which is capable of completely combusting high temperature, high viscosity exhaust gas.

The stirring device for complete combustion of exhaust gas of the present invention can be used in steel manufacturing plants, pre-treatment plants, etc., for example in Figs.
As shown in the figure, a water-cooled air blowing nozzle 3 or 3' is installed near the gas introduction part of the exhaust gas duct 2 of the hot metal ladle 1.
Alternatively, a plurality of 3" pipes are provided at right angles to the gas flow G, and in the illustrated example, four pipes are arranged in parallel at least in one stage. (In the figure, two stages are provided to show the arrangement position.) The air blowing nozzles 3, 3', 3'' have different structures, and as shown in Fig. 1a, there is no wall such as a casing or membrane below, and the exhaust gas hood 4 is suspended from the upper wall. As shown in FIG. 2, the air blowing nozzle 3 is made up of a triple pipe suspended through the upper wall of the exhaust gas hood 4, and includes a core pipe 5 into which air is introduced from the upper end, an inner pipe 6, and an outer pipe 7.
A large number of air outlets 8 which blow out air at right angles to the flow of gas from the exhaust gas hood 4 to the exhaust gas duct 2 are provided alternately at regular intervals on both the left and right sides, and the inner pipe 6 and outer pipe 7 are located at the lower end. A cooling water inlet 9 is provided at the upper end of the inner pipe 6 outside the exhaust gas hood 4, penetrating the outer pipe 7, and a cooling water inlet 10 is provided at the upper end of the outer pipe 7 outside the exhaust gas hood 2. It is being

Another example of the air blowing nozzle 3', which is suspended from the upper wall of the exhaust gas hood 4, is made of a triple pipe suspended through the upper wall of the exhaust gas hood 4, as shown in FIG. The lower end of the core pipe 5' into which the gas is introduced is communicated with the outer pipe 7', and the exhaust gas hood 4
A cooling water outlet 10 is provided at the upper end of the outer pipe 7', an air inlet 11 is provided at the upper end of the inner pipe 6' outside the exhaust gas hood 4 through the outer pipe 7', and an air inlet 11 is provided at the upper end of the inner pipe 6' outside the exhaust gas hood 4. At 6', a large number of air outlets 8' are provided alternately at regular intervals on both the left and right sides, passing through the outer tube 7 and blowing out air perpendicular to the flow of gas in the exhaust gas hood 4.

As shown in Fig. 1a, there are walls such as casings or membranes on the top and bottom (or left and right) near the entrance of the exhaust gas duct 2, and the air blowing nozzle is supported by penetrating both the top and bottom walls (or both the left and right walls). 3″ is
As shown in Fig. 4, the exhaust gas duct 2 is made up of a double pipe penetrating opposite walls, and air is introduced into the inner pipe 6'' from at least one end, and the outer pipe 7'' is passed through the outer pipe 7'' to flow into the exhaust gas duct. On the other hand, a large number of air outlets 8'' that blow out air at right angles are provided alternately at regular intervals on both left and right sides (or both upper and lower sides), and an inner pipe 7'' outside the exhaust gas duct 2 is provided.
A cooling water inlet 9 is provided at one end, and a cooling water inlet 10 is provided at the other end of the outer shell 7'' outside the exhaust gas duct 2.
is provided. If air is introduced through only one end of the inner tube 6'', the other end is made blind.

It is sufficient that the air blowing nozzles 3, 3' of the triple-pipe water-cooled structure shown in FIGS. 2 and 3 are installed in parallel in one stage near the exhaust gas duct 2. A plurality of air-cooled blow-off nozzles 3'' having a double-pipe water-cooled structure shown in the figure are installed in parallel in the exhaust gas duct 2, and are installed in multiple stages as necessary, that is, to ensure complete combustion of the exhaust gas.

Now, in the stirring device for complete combustion of exhaust gas of the present invention installed near the gas introduction part of the air blowing nozzle 3 or 3' or 3'' gas duct 2 having the water-cooled structure, the CO gas generated from the hot metal ladle 1 is removed from the exhaust gas. Due to the operation of an induced fan (not shown) further downstream than the dust collector (not shown) downstream of the duct 2, the gas is guided to the upper exhaust gas duct 4 and flows as shown by the dotted line.
It flows through the exhaust gas duct 2. The flow of CO gas is perpendicular to the air outlet 8 or 8' of the air blowing nozzle 3 or 3' shown in FIG. Since the air is blown out, the high-temperature, high-viscosity CO gas that is about to pass between each air blowing nozzle 3 or 3' and on the left and right sides is sufficiently and efficiently agitated, and is completely combusted in the downstream flow. It will be done.

In addition, the CO gas flow flowing into the exhaust gas duct 2 from the air outlet 8'' of the air blowing nozzle 3'' shown in FIG. Since the air is blown out at right angles, the high-temperature, high-viscosity CO gas that attempts to pass between each air blowing nozzle 3'' and on both the left and right sides (or both the top and bottom sides) is sufficiently and efficiently agitated and flows downstream. Complete combustion is achieved.

Each of the air blowing nozzles 3 or 3' or 3'' is heated by high-temperature CO gas, but since cooling water is passed between the outer tube and the inner tube, burnout is prevented.

In addition, in the stirring device for complete combustion of exhaust gas, in which the air blowing nozzle 3 or 3' is suspended from the upper wall of the exhaust gas hood 4 in the vicinity of the exhaust gas duct 2, as shown in FIG. Regarding the scattering of slag and metal, those that collide with the air blowing nozzle 3 or 3' are cooled by the water-cooled wall and fall, so that they can be prevented from flying into the exhaust gas duct 2 side.

The exhaust gas that has passed through each of the air blowing nozzles 3, 3', or 3'' and has been completely combusted passes through the exhaust gas duct 2, where the high-temperature exhaust gas is cooled down by a gas cooler (not shown) and then collected. into the dustbin,
After the dust is removed, it is released into the atmosphere via an induced blower and a gas dispersion chimney.

As can be seen from the above explanation, the stirring device for complete combustion of exhaust gas in steelmaking plants, pretreatment plants, etc. of the present invention has multiple air blowing nozzles with a water-cooled structure arranged in parallel at right angles to the flow of CO gas near the introduction of the exhaust gas duct. Since the air is blown out at right angles to the flow of CO gas generated from the converter, hot metal ladle, etc., high temperature and high viscosity air that tries to pass between each air blowing nozzle and both outside sides is The combined CO gas is sufficiently and efficiently stirred and completely combusted downstream. Therefore, operational safety is ensured by eliminating explosions caused by unburned gas, and harmful CO2 is eliminated.
Gas is not released into the atmosphere, contributing to the prevention of pollution. Also, air was blown out and stirred. The combustion chamber in the middle of the exhaust gas duct that burns CO gas can be small, so it can be downsized, which has the effect of reducing costs. In particular, in the case of a stirring device for complete combustion of exhaust gas, in which a water-cooled air blowing nozzle is suspended from the upper wall near the exhaust gas duct of the exhaust gas hood, slag from the converter, hot metal pot, etc.
Since it is possible to prevent the scattering of metal, that is, it is possible to carry out a slab catch, it also has the effect of preventing slag from flying into the exhaust gas duct.

[Brief explanation of drawings]

FIGS. 1a and 1b are a schematic side view and a plan view of a stirring device for complete combustion of exhaust gas in a steelmaking plant, a pretreatment plant, etc. according to the present invention, and show the arrangement of air blowing nozzles having a water-cooled structure. 2 to 4 are longitudinal cross-sectional views of examples of air blowing nozzles having a water-cooled structure in the stirring device for complete combustion of exhaust gas according to the present invention. 1...Hot metal pot, 2...Exhaust gas duct, 3, 3',
3″...Air blowing nozzle, 4...Exhaust gas hood,
5, 5'... core tube, 6, 6', 6''... inner tube, 7,
7', 7''...outer pipe, 8, 8', 8''...outlet, 9
...Cooling water inlet, 10...Cooling water outlet, 11
...Air inlet.

Claims (1)

[Scope of Claims] 1. A steelmaking plant, a pretreatment plant, etc., in which a plurality of water-cooled air blowing nozzles are arranged in parallel at right angles to the gas flow in the vicinity of the gas introduction part of a gas duct in a steelmaking plant, pretreatment plant, etc. Gas stirring device for complete combustion of exhaust gas in processing plants, etc. 2. The water-cooled air blowing nozzle consists of a triple pipe suspended through the upper wall of the exhaust gas hood.
Air is introduced from the upper end of the core pipe, and a large number of air outlets are provided at regular intervals on both the left and right sides of the pipe, passing through the inner and outer pipes and blowing out air at right angles to the flow of gas in the exhaust gas hood. The outer pipe is connected at the lower end, a cooling water inlet is provided at the upper end of the inner pipe outside the exhaust gas hood passing through the outer pipe, and a cooling water outlet is provided at the upper end of the outer pipe outside the exhaust gas hood. A steel manufacturing plant according to claim 1, characterized in that:
Gas stirring device for complete combustion of exhaust gas in pre-treatment plants, etc. 3. The water-cooled air blowing nozzle consists of a triple pipe suspended through the upper wall of the exhaust gas hood.
The lower end of the core pipe into which cooling water is introduced from the upper end communicates with the outer pipe, a cooling water outlet is provided at the upper end of the outer pipe outside the exhaust gas hood, and the outer pipe is connected to the upper end of the inner pipe outside the exhaust gas hood. An air inlet is provided through the exhaust gas hood, and a large number of air outlets are provided at regular intervals on both sides of the exhaust gas hood, passing through the outer tube and blowing out air at right angles to the flow of gas in the exhaust gas hood. A gas stirring device for complete combustion of exhaust gas in a steel manufacturing plant, a pretreatment plant, etc., as set forth in claim 1. 4. The water-cooled air blowing nozzle consists of a double pipe that passes through opposing walls of the exhaust gas duct, and air is introduced from at least one end into the inner pipe that passes through the outer pipe to control the flow of gas inside the exhaust gas hood. A large number of outlets are provided at regular intervals on both sides to blow out air at right angles to the exhaust gas hood.A cooling water inlet is provided at one end of the outer pipe outside the exhaust gas hood, and a cooling water inlet is provided at the other end of the outer pipe outside the exhaust gas hood. A gas stirring device for complete combustion of exhaust gas in a steelmaking plant, a pretreatment plant, etc. according to claim 1, characterized in that a water inlet is provided.