JPH066930U - Exhaust gas leakage prevention device from gas cooling room - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if corrosion occurs on the wall of the gas cooling room for cooling the exhaust gas generated from the waste incinerator, etc., the exhaust gas does not leak from the corroded part. The exhaust gas leakage prevention device of is provided. [Structure] An outer cover iron plate 1 of a gas cooling chamber, which comprises an outer cover iron plate 1, a heat insulating material layer 2 and a heat resistant castable layer 3 formed on the inner surface thereof, and has a plurality of cooling water injection nozzles 4.
By providing an air blowing hole 6 in the heat insulating material layer 2 through the air blowing hole 6, a positive pressure is created between the iron plate 1 and the heat resistant castable layer 3, whereby the heat resistant castable Even if a crack is generated in the layer 3, the exhaust gas flowing in the gas cooling chamber is prevented from leaking from the crack.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is a device for preventing exhaust gas from leaking from a gas cooling chamber, in which the exhaust gas does not leak from the gas cooling chamber due to corrosion or the like generated in the gas cooling chamber for cooling the exhaust gas discharged from a refuse incinerator or the like. It is about.

[0002]

[Prior art]

 Exhaust gas generated by incineration of waste in a refuse incinerator collects dust and other contaminants contained in it in a dust collector and then is released into the atmosphere through a chimney. The exhaust gas discharged from the refuse incinerator has a high temperature of about 1000 ° C. Therefore, if such a high-temperature exhaust gas is directly introduced to a dust collector or the like, there arises a problem that the dust collector is burned out. Therefore, the exhaust gas discharged from the refuse incinerator is guided to the gas cooling chamber and cooled to a temperature of about 300 ° C in the gas cooling chamber.

FIG. 2 is a schematic vertical sectional view of a conventional gas cooling chamber. As shown in FIG. 2, the gas cooling chamber has, for example, a cylindrical shape having a height of about 7 to 8 m, and the chamber wall has an iron plate 1 forming the outer cover and an inner side of the outer cover iron plate 1. It comprises a heat insulating material layer 2 formed by connecting a plurality of board-like heat insulating materials in the circumferential direction, and a heat resistant castable layer 3 provided inside the heat insulating material layer 2.

A plurality of injection nozzles 4 are provided at predetermined positions on the inner peripheral surface of the gas cooling chamber in the circumferential direction, and the cooling water injected from the injection nozzles 4 causes high-temperature exhaust gas flowing in the gas cooling chamber. Is cooled to a temperature of around 300 ° C.

[0005]

[Problems to be solved by the device]

 As described above, the exhaust gas discharged from the refuse incinerator has a high temperature and its temperature changes drastically. Therefore, it is inevitable that minute cracks 5 are generated in the heat resistant castable layer 3 forming the inner wall of the gas cooling chamber.

On the other hand, the exhaust gas contains hydrogen chloride, sulfur oxide and the like. Therefore, during cooling with cooling water in the gas cooling chamber, hydrochloric acid and sulfuric acid are produced by hydrogen chloride, sulfur oxide, etc. in the exhaust gas. As a result, exhaust gas containing hydrochloric acid or sulfuric acid passes through the crack 5 and invades the gap between the connecting portions of the plurality of board-shaped heat insulating materials constituting the heat insulating material layer 2 to the jacket iron plate 1, and the invaded exhaust gas The outer cover 1 is corroded. As described above, when the iron plate 1 is corroded, exhaust gas containing harmful substances such as dust leaks out from the gas cooling chamber, which causes a problem of harming environmental hygiene.

Therefore, conventionally, a repair material is adhered to the corroded portion of the outer steel plate 1 and the portion of the crack 5 formed in the heat resistant castable layer 3 on the inner wall of the outer steel sheet 1, and the leak material is prevented from leaking by the repair material. . However, for such repairs, the operation of the refuse incinerator must be temporarily stopped, and personnel for repair work are required, because the work is performed in a high temperature environment. In addition, there were many problems in terms of health and safety.

Therefore, an object of the present invention is to solve the above-mentioned problems and to eliminate exhaust gas from the corroded portion even if the wall of the gas cooling chamber for cooling the exhaust gas generated from the refuse incinerator or the like is corroded. It is intended to provide a device for preventing exhaust gas from leaking from a gas cooling chamber, which does not leak.

[0009]

Means for Solving the Problem] The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems. As a result, if the air is blown into the heat insulating material layer of the gas cooling chamber through the outer steel plate and the positive pressure is maintained between the outer steel plate and the heat resistant castable layer, cracks etc. will occur in the heat resistant castable layer on the inner wall of the gas cooling chamber. It was found that the exhaust gas does not leak from the cracked portion even when the occurrence of the above occurs. The present invention is based on the above findings, and the device of the present invention is characterized by the following. In the gas cooling chamber, which comprises an outer cover iron plate, a heat insulating material layer and a heat-resistant castable layer formed on the inner surface of the outer cover iron plate, and a plurality of cooling water injection nozzles are provided on the inner surface, At least one air blowing hole is provided in the iron plate, and the outer iron plate and the heat resistant castable layer are formed by blowing air into the heat insulating material layer through the at least one air blow hole. A positive pressure is provided between the heat-resistant castable layer and the heat-resistant castable layer to prevent the exhaust gas flowing in the gas cooling chamber from leaking from cracks.

[0011]

[Action]

 In this invention, air is blown into the heat insulating material layer through at least one air blowing hole provided in the outer steel plate of the gas cooling chamber, and a positive pressure is applied between the outer iron plate and the heat resistant castable layer. Kept in. Therefore, even if a crack occurs in the heat resistant castable layer, the exhaust gas flowing through the gas cooling chamber does not leak through the crack. Therefore, the outer steel plate is not corroded by the exhaust gas.

[0012]

【Example】

 Next, the present invention will be described by way of examples. FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention. As shown in FIG. 1, the gas cooling chamber includes an outer cover iron plate 1 and a heat insulating layer 2 formed inside the outer cover iron plate 1 by circumferentially connecting a plurality of board-like heat insulating members. And a heat-resistant castable layer 3 provided inside the heat insulating material layer 2, and a plurality of cooling water injection nozzles 4 are provided at predetermined positions on the inner peripheral surface of the gas cooling chamber. , The same as the conventional one.

In the device of the present invention, at least one air blowing hole 6 is provided in the outer cover iron plate 1 in the vicinity of the portion of the gas cooling chamber where the cooling water injection nozzle 4 is provided. Air is blown through the air blowing hole 6 by a fan (not shown) at a pressure of about 200 mmHg.

Since the heat insulating material layer 2 provided on the inner side of the jacket iron plate 1 is formed by connecting a plurality of board-like heat insulating materials in the circumferential direction, the air blowing holes 6 of the jacket iron plate 1 are formed. The air blown from through the heat insulating material layer 2 passes through the gap formed in the connecting portion of the plurality of board-shaped heat insulating materials and flows toward the heat resistant castable layer 3 formed inside the heat insulating material layer 2. As a result, a positive pressure is maintained between the outer cover steel plate 1 and the heat resistant castable layer 3.

Therefore, even if the cracks 5 are present in the heat resistant castable layer 3, the exhaust gas passing through the gas cooling chamber does not enter the jacket iron plate 1 through the cracks 5, and the exhaust gas causes the exhaust gas to reach the jacket iron plate 1. No corrosion will occur.

Corrosion of the outer steel plate 1 of the gas cooling chamber is most likely to occur near the portion of the gas cooling chamber where the cooling water jet nozzle 4 is provided. Therefore, it suffices to provide one air blowing hole 6 in the outer cover 1 below the cooling water jet nozzle 1 to 2 m, but if necessary, a plurality of air blowing holes 6 may be provided in the circumferential direction. .

It is preferable that air is blown from the air blowing hole 6 at all times during the operation of the refuse incinerator. Does not flow. Therefore, if a flow meter or the like is attached to the air blowing hole 6, the presence or absence of the crack 5 can be easily detected.

[0018]

[Effect of device]

 As described above, according to the device of the present invention, even if the wall of the gas cooling chamber for cooling the exhaust gas generated from the refuse incinerator etc. is corroded, the exhaust gas leaks from the corroded part. Therefore, there is no need for the conventional repair work for the cracked part, and there is no need to temporarily suspend the operation of the refuse incinerator for repair, which brings industrially useful effects. .

[Brief description of drawings]

1 is a schematic vertical sectional view showing an embodiment of a gas cooling chamber to which the device of the present invention is attached.

FIG. 2 is a schematic vertical sectional view showing a conventional gas cooling chamber.

[Explanation of symbols]

 1 outer steel plate, 2 heat insulating material layer, 3 heat resistant castable layer, 4 cooling water injection nozzle, 5 cracks, 6 air blowing holes.

Claims (1)

[Scope of utility model registration request] 1. An outer cover iron plate, and a heat insulating material layer and a heat resistant castable layer formed on an inner surface of the outer cover iron plate,
In the gas cooling chamber having a plurality of cooling water injection nozzles provided on its inner surface, at least one air blowing hole is provided in the outer steel plate, and the at least one air blowing hole is passed through the at least one air blowing hole. By injecting air into the heat insulating material layer, a positive pressure is formed between the jacket iron plate and the heat resistant castable layer, whereby exhaust gas flowing through the gas cooling chamber, from cracks generated in the heat resistant castable layer. Exhaust gas leakage prevention device from the gas cooling chamber, which is characterized by preventing the leakage of