JPH04214113A - Exhaust duct - Google Patents

Abstract

PURPOSE:To prevent the attachment of reaction products on to an exhaust duct by providing an injection port for blowing out the compressed air along the inner wall of the exhaust duct. CONSTITUTION:An inner wall 2 is provided on the inside of a duct outer wall 1, and compressed air is fed between the duct outer wall 1 and duct inner wall 2 to inject air all the time from an injection port 4 provided in the duct inner wall. It is, therefore, possible to prevent reaction products from attaching on to the duct inner wall.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust duct, and more particularly to an exhaust duct for discharging spent gas from a reactor.

0002

2. Description of the Related Art Conventionally, reaction products contained in the exhaust gas adhere to an exhaust duct for discharging the exhaust gas used in a reactor. Then, in order to remove this deposit, the equipment was stopped and the inside of the exhaust duct was cleaned.

0003

[Problems to be Solved by the Invention] In the conventional exhaust duct described above, it is essential to stop the existing exhaust line when cleaning it, and even if cleaning is performed by mechanical means or chemicals, the exhaust duct cannot be accessed. There was a problem in that it was difficult to completely remove the deposits.

0004

[Means for Solving the Problems] The exhaust duct of the present invention includes:
In order to prevent reaction products from adhering inside the exhaust duct, an injection port is provided along the inner wall of the exhaust duct to blow out compressed air.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a sectional view of an exhaust duct according to a first embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view and FIG. 1B is an AA sectional view thereof. A duct inner wall 2 is provided inside the duct outer wall 1, compressed air 3 is sent between the duct outer wall 1 and the duct inner wall 2, and air is constantly injected from the air outlet 4 provided on the duct inner wall 2. Preventing products from adhering to the inner wall 2. FIG. 2 is a sectional view of Example 2 of the present invention, where FIG. 2(a) is a longitudinal sectional view and FIG. 2(b) is a BB sectional view thereof. A pipe 5 is passed between the duct outer wall 1 and the guide 2, compressed air 3 is blown out from an injection port 4 opened in the pipe wall surface, and further blown into the duct from the gap between the duct outer wall 1 and the guide 2. In this example, since the inner surface of the duct can be evenly covered with a layer of air, the reactants are less likely to adhere than in Example 1.

[0006]

As explained above, in the present invention, since compressed air is constantly blown onto the inner surface of the exhaust duct, it is possible to prevent reactants from adhering to the inner wall of the exhaust duct.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view and FIG. 1B is a sectional view taken along line AA in FIG.

2 shows a second embodiment of the present invention, FIG. 2(a) is a longitudinal sectional view, and FIG. 2(b) is a BB sectional view of FIG. 2(a).

[Explanation of symbols]

1 Duct outer wall 2 Duct inner wall 3 Compressed air 4 Injection port 5 Piping 6 Guide

Claims (1)

[Claims] 1. An exhaust duct for discharging used exhaust gas from a reactor, characterized in that a compressed air outlet is provided along an inner wall of the exhaust duct to prevent reaction products from adhering to the exhaust duct. duct.