JPS5842430Y2 - Sealing device for the connection between the gas cooler and primary dust collector confuser in converter exhaust gas treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a joint between a gas cooler and a confuser of a primary dust collector in a converter exhaust gas treatment system.

The gas cooler in the conventional converter exhaust gas treatment equipment cools the exhaust gas from the converter passing through the gas passage of the gas cooler with room-temperature cooling water that is open to the atmosphere and is supplied from a cooling tower. The mainstream was to use a hot water boiler as a gas cooler to absorb the heat of the converter exhaust gas and cool the converter exhaust gas.

By the way, the cooling water involved in cooling the converter exhaust gas in the former gas cooler is discharged as hot water at 50 to 60°C, and then air-cooled and the heat is dissipated into the atmosphere. The cooling water that absorbed the heat of the converter exhaust gas was 70 to 11
After being discharged as hot water at 0°C, it is cooled by an air-cooled heat exchanger and the heat is dissipated into the atmosphere, which poses a problem in terms of energy conservation.

For this reason, recently, the gas cooler of the converter exhaust gas treatment device is used as a normal boiler to recover heat and effectively utilize the heat of the converter exhaust gas.

In this case, the feed water that has entered the boiler drum circulates within the boiler and is heated to become a mixture of steam and water at a temperature of 200°C or higher, resulting in large thermal expansion at the boiler outlet header.

Normally, the boiler outlet header is located at the upper end of the confuser of the primary precipitator below the gas cooler, so it is connected to the confuser. If the boiler outlet header, which has a large thermal expansion, is directly connected to the upper end of a confuser having a water-cooled jacket structure, there is a risk that large thermal stress will be generated in the connection part and it will be damaged.

For this reason, conventionally, as shown in Fig. 1, a partition tube 3 is vertically installed below the boiler outlet header 1 via a ring 2, and this partition tube 3 is placed on the outer circumferential side of the upper end of the confuser 4 of the primary dust collector. The boiler outlet header 1 of the gas cooler is connected to the confuser 4 by a sealing device that is immersed in the provided overflow tank 5 to seal it.

However, when the cooler is a boiler type, the connection method using the conventional sealing device described above does not allow the boiler outlet header 1
becomes 200°C or more and the confuser 4 is at room temperature, so the upper end of the partition tube 3 expands together with the boiler outlet header 1, and the lower end of the partition tube 3 is cooled in the water in the overflow tank 5. It does not expand.

Therefore, thermal stress is generated in the partition tube 3, which may cause deformation and damage, leading to an accident in which the converter gas leaks to the outside.

The present invention was made to solve this problem, and it is possible to expand the partition tube of the sealing device at the connection between the boiler outlet header of the gas cooler and the confuser of the primary dust collector. It is an object of the present invention to provide an improved sealing device that can reduce the temperature difference between the inner and outer circumferential surfaces of a partition tube.

Hereinafter, an embodiment of the sealing device according to the present invention will be described with reference to the drawings. In FIGS. 2 and 3, 1 is a boiler outlet header at the lower end of a boiler-shaped gas cooler;
A partition tube 7 made of a corrugated plate having a corrugated shape in the circumferential direction is provided vertically downwardly through a cross-sectional ring 6, and a certain gap is left between the inner and outer circumferential sides of the upper part of the partition tube 7. The shielding rings 8, 8' are formed by vertically stacking the strips one after another.

On the other hand, an overflow tank 5 that overflows into the confuser 4 is provided on the outer circumferential side of the upper end of the confuser 4 having a water-cooled jacket structure of the primary dust collector connected below the gas cooler. The partition tube 7 and shielding rings 8, 8' are recessed.

According to the sealing device of the present invention having such a structure, the boiler outlet header 1 of the boiler-type gas cooler is heated by the internal steam of 200° C. or more, and also receives radiant heat from the high-temperature converter gas, thereby causing a large thermal load. However, the boiler outlet header 1
Since it is not directly connected to the confuser-4 of the primary precipitator and is a free end, it is possible to absorb thermal expansion.

Therefore, the thermal stress generated in the boiler outlet header 1 can be alleviated.

In addition, even if the upper end of the partition tube 7 vertically installed below the boiler outlet header 1 submerged in the overflow tank 5 on the outer circumference side of the upper end of the comfuser-4 is exposed to the water in the overflow tank 5, Since the shielding rings 8, 8' are provided on the circumferential side with a certain gap, the inner surface of the upper end of the partition tube 7 is not exposed to the high temperature converter gas, so that it is not directly exposed to radiant heat. Moreover, since the outer periphery of the upper end of the partition tube 7 is not exposed to the outside air, it is not rapidly cooled.

In other words, since the inner and outer circumferential sides of the upper end of the partition tube 7 have approximately the same temperature atmosphere, the temperature difference between the inner and outer circumferential surfaces of the upper end of the partition tube 7 is reduced, and thermal deformation of the partition tube 7 is prevented.

Moreover, since the partition tube 7 is made of a corrugated plate having a corrugated shape in the circumferential direction, the temperature between the boiler outlet header 1 and the lower part immersed in water in the overflow tank 5 receives heat transfer from the cross-sectional ring 6. Even if a difference occurs, thermal stress can be alleviated by expanding the body.

Furthermore, since the shielding ring 8 exposed to the converter gas is made by sequentially layering strips, each strip thermally expands in both directions even when exposed to radiant heat and reaches a high temperature, thereby alleviating thermal stress. Can be done.

Furthermore, since the shielding ring 8' exposed to the outside air is constructed by sequentially stacking strips, each strip contracts even when cooled by the outside air, so that thermal stress can be alleviated.

Therefore, the shielding rings 8, 8' will not be deformed or damaged.
The partition tube 7 can be protected.

As detailed above, according to the sealing device of the present invention, even if there is large thermal expansion at the boiler outlet header of the gas cooler in the converter exhaust gas treatment equipment, the thermal stress applied to the partition tube can be alleviated. .

In other words, the lower partition tube of the boiler outlet tube, which is immersed in the overflow tank on the outer periphery of the upper end of the confuser of the primary dust collector, is provided on the inside and outside of the partition tube and is covered with a shielding ring to prevent temperature differences between the inside and outside surfaces. The gas seal becomes perfect because the heat deformation of the partition tube can be prevented and no damage will occur.

Moreover, since the partition tube is protected by a corrugated plate having a corrugated shape in the circumferential direction, the body can expand arbitrarily to relieve thermal stress.

Furthermore, since the shielding rings that cover the inner and outer surfaces of the partition tube are made by rubbing strips in the circumferential direction, they can be expanded or expanded as desired.
Thermal stress generated in the shielding ring due to contraction can be alleviated, and deformation damage will not occur, so the partition tube can be protected.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional sealing device for the connection between a gas cooler and a confuser of a primary precipitator in a converter exhaust gas treatment device, and FIG. 2 is a cross-sectional view of a sealing device of the present invention. Third
The figure is a cross-sectional view taken along the line A--A in FIG. 2. 1...Boiler outlet header, 4...Confuser-15...Overflow tank, 6...Cross-sectional ring, 7...・・Partition tube, 8, 8'...
...shielding ring.

Claims (1)

[Scope of utility model registration request] In converter exhaust gas treatment equipment, a corrugated plate partition tube is installed vertically below the outlet pipe at the bottom end of the boiler-shaped gas cooler, and plates are sequentially stacked on the inside and outside of the top of the partition tube to provide shielding. A ring is installed vertically, and an overflow tank is provided outside the upper end of the confuser of the primary dust collector connected below the gas cooler, and an overflow tank is provided for overflowing into the confuser. and a sealing device for a connection between a gas cooler and a confuser of a primary dust collector in a converter exhaust gas treatment device in which a shielding ring is inserted.