JPH0259367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a stack crane prevention method that is attached to a chimney and prevents the stack crane phenomenon.

[Prior art and problems]

The main cause of the static rain phenomenon is thought to be that droplets generated in the flue are carried into the chimney by the exhaust gas airflow and released into the atmosphere. Therefore, it is necessary to separate the droplets that have flowed through the flue together with the exhaust gas stream when they enter the chimney.

Conventionally, as a stack crane prevention method, the moisture contained in the exhaust gas that is separated into droplets and flowed into the chimney is removed. In order to increase the chances of contact with the chimney, it is generally known to forcibly change the flow in the direction along the inner wall surface of the chimney using a current deflector or the like.

However, when the exhaust gas airflow changes direction or collides with the inner wall of the chimney, it is expected that it will separate as droplets, so there may be cases where it does not separate, so the exhaust gas airflow completely removes the moisture content. It may rise up the chimney without being removed.

Furthermore, even if droplets adhere to the inner wall surface of the chimney, they may flow again on the exhaust gas airflow before flowing to a discharge section such as a drain groove.

[Purpose of the invention]

This invention was devised in view of the above-mentioned circumstances, and its purpose is to remove moisture contained in the exhaust gas caused by droplets generated in the flue being carried along with the airflow and causing the exhaust gas to enter the chimney. It is an object of the present invention to provide a method for preventing stacked rain that can be reliably collected and removed.

[Structure of the invention]

According to this invention, by slowing down the flow rate of the exhaust gas passing through the demister, moisture contained in the exhaust gas is reliably captured in the form of droplets. In other words, the collection has a larger passage area for exhaust gas than the chimney and flue, is divided into upper and lower parts by a demister, and has a flue and chimney connected to one end below the demister and the other end above the demister. Set up a room. Then, the exhaust gas from the flue is slowed down at the connection part and enters the collection chamber, passes through the demister from below while the contained moisture is captured and removed as droplets, and the flow speed is increased again at the connection part to form the chimney. It was made to flow inward.

〔Example〕

The present invention will be explained below with reference to illustrative embodiments.

The collection chamber 3 that collects the moisture contained in the exhaust gas stream 2 from the flue 1 is divided into upper and lower parts by a demister 4, with the upper part of the demister 4 at one end 3a and the upper part of the demister 4 at the other end 3a.
sloped surfaces 5, 5 that are inclined in parallel to each other below the demister 4 toward the other end 3b; and a drain section that is provided below the demister 4 and collects droplets captured by the demister 4 and discharges them to the outside. It has 6.

A flue 1 is connected below the demister 4 at one end 3a, and a chimney 7 is connected above the demister 4 at the other end 3b.

This collection chamber 3 is formed to have a larger passage area for the exhaust gas airflow 2 than the flue 1 and the chimney 7,
The connecting portion 8 of the flue 1 has both side walls 1a, 1a widened at an angle of 30° and is connected to the both side walls 3c, 3c of the collection chamber 3, and the connecting portion 9 of the chimney 7 has both side walls 1a, 1a widening at an angle of 30°.
a, 7a extend at an angle of 60° and are connected to both side walls 3c, 3c of the collection chamber 3.

When the exhaust gas airflow 2 guided to the collection chamber 3 by the flue 1 passes through the connecting part 8, the flue 1 expands, the pressure is weakened, the flow velocity becomes slow, and the exhaust gas airflow 2 enters the collection chamber 3.

The exhaust gas airflow 2 that has entered the collection chamber 3 passes through the demister 4 from below and flows above the demister 4.
At this time, the moisture contained in the exhaust gas stream 2 is captured as droplets, and the droplets fall into the drain section 6 due to their own weight and are discharged to the outside. The exhaust gas airflow 2 that has passed through the demister 4 flows to the chimney 7, but when it passes through the connection part 8, the chimney 7 narrows and the pressure increases.
The flow speed increases and it rises inside the chimney 7.

Note that the shape of the collection chamber 3 and the shape of the connection between the flue and the chimney are not limited to those in this embodiment, and can slow down the flow velocity of the exhaust gas passing through the demister and increase the flow velocity when flowing into the chimney. Any type of material may be used as long as it is formed like this.

However, with this embodiment, the contained moisture can be reliably collected without increasing ventilation resistance.

〔Effect of the invention〕

The present invention has the above configuration and has the following effects.

By slowing down the flow rate of the exhaust gas passing through the demister, the moisture contained in the exhaust gas can be reliably captured.

The collection chamber with a demister has a larger passage area for exhaust gas than the chimney and the flue, so when it enters the collection chamber from the flue, the pressure is weakened and the flow rate of the exhaust gas is slowed down. It is possible to increase the pressure when entering the exhaust gas and increase the flow rate of the exhaust gas. Therefore, it is not necessary to install a special device to control the flow velocity, and the structure can be simple.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a chimney employing the prevention method of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. DESCRIPTION OF SYMBOLS 1... Flue, 1a... Side wall, 2... Exhaust gas flow, 3... Collection chamber, 3a... One end, 3b... Other end, 3c... Side wall, 4... Demister, 5... Inclined Surface, 6...Drain part, 7...Chimney, 7a...
Side wall, 8...connection section, 9...connection section.

Claims (1)

[Claims] 1. At the connection between the chimney and the flue that guides the exhaust gas, a passage area for the exhaust gas is formed larger than that of the chimney and the flue, and the area is divided into upper and lower parts by a demister, and the lower part of the demister is divided into upper and lower parts. A collection chamber with a flue and a chimney connected to one end and the other end above the demister is provided, and the exhaust gas from the flue is slowed down, passes through the demister from below, and then speeds up again. A method for preventing stack rain, characterized in that the moisture contained in the demister is ensured to be captured as droplets by flowing through the demister at a slow flow rate.