JPH02267413A - Stack rain prevention device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a stuck rain prevention device installed at the top of a chimney.

[Conventional technology]

The exhaust gas treated by the wet flue gas desulfurization equipment is generally supersaturated and contains a large amount of water droplets, and depending on atmospheric conditions, the water droplets fall to the ground, causing stack rain pollution.

Various devices have been proposed as measures to prevent this stuck rain pollution.

This type of stack rain prevention device is: ■ The exhaust gas is swirled in the chimney to separate and remove water droplets contained in the exhaust gas.

■ A baffle plate is installed in the exhaust gas basin, and the water droplets contained in the exhaust gas are collided with the baffle plate to trap and remove them.

[Problems to be Solved by the Invention] However, all of the above-mentioned stuck rain prevention devices have a large pressure loss, and their water droplet trapping efficiency cannot be said to be sufficient.

That is, these known stuck rain prevention devices have a diameter of 1
．． It is difficult to collect water droplets of about 0 to 0.5 m, and there is a problem that such water droplets fall not far from the chimney.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a simple stack rain that prevents water droplets from being released into the atmosphere when exhaust gas is released from a chimney. The object of the present invention is to provide a prevention device.

[Means for solving problems]

The present inventors have completed the present invention as a result of intensive studies to achieve the above object.

The above purpose is to provide an annular bottom plate that is coaxially provided on the outside of a cylindrical chimney body with an inner diameter of d at a distance b downward from the top of the chimney body, and an annular bottom plate that is provided on the bottom plate and that is located below the top of the chimney body with an inner diameter of d. 2a In a stuck rain prevention device consisting of a drip collection pipe having a large inner diameter and a height C and a drain pipe provided on the bottom plate, a/d is 0.1 or more and 0.5 or less, and b/d is This is achieved by the above stuck rain prevention device characterized in that c/d is 0.1 or more and 0.5 or less, and c/d is 0.5 or more and 1.5 or less.

[For production]

With the above configuration, when the dimensions of the stack rain prevention device, a, b, and C are within the above ranges with respect to the chimney body inner diameter d, the exhaust gas flows to the inner wall of the drip collection pipe. A reduced pressure area is created, and therefore water droplets contained in the exhaust gas adhere to the inner wall of the droplet collecting pipe, flow down onto the bottom plate, and then are collected through the drain pipe. Therefore, since water droplets are not released into the atmosphere, stuck rain can be prevented.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the stuck rain prevention device according to the present invention.

In Fig. 1, 1 is the chimney body, 2 is a cylindrical drip collection tube provided coaxially with the chimney body 1, 3 is a bottom plate provided on the chimney body 1, and 4 is provided on the bottom plate 3. It is a drain pipe.

The chimney body 1 has a cylindrical shape with an inner diameter d, and an annular bottom plate 3 is provided at a distance b from the top of the chimney body 1 in order to coaxially arrange the drip collection pipe 2.

The inner diameter of the droplet collecting pipe 2 is 28 larger than the inner diameter d of the chimney body 1, and the height of the collecting pipe 2 is C.

Therefore, in the present invention, a/d is 0.1 or more and 0.5 or less, b/d of 0.1 or more and 0.5 or less, c / d from 0.5 to 1.5 shall be.

With respect to the inner diameter d of the chimney body 1, the distance a between the collecting pipe 2 and the outer surface of the chimney 1, the distance from the top of the bottom plate 3 to the top of the chimney main body 1, and the height C of the collecting pipe 2 are within the above range. When this is the case, a reduced pressure area is created on the inner wall of the drip collecting tube 2 due to the flow of the exhaust gas, and therefore water droplets contained in the exhaust gas adhere to the inner wall of the drip collecting tube 2, then flow down onto the bottom plate 3, and then further It is collected through the drain pipe 4.

Therefore, since water droplets are not released into the atmosphere, stuck rain can be prevented.

Example 1 An experimental chimney made of acrylic resin with an inner diameter of about 300 tm and a height of about 10 m was prepared, and drip collection pipes with various dimensions were installed at the top of the chimney, and the presence or absence of water droplets discharged from the top of the chimney was observed. do.

Here, the exhaust gas conditions are as follows: (a, b and C indicate the parts shown in Figure 1, the same applies below) Gas flow rate = 20 m/sec Gas temperature: 45°C Gas composition: moisture 0.3 g/l Saturated water vapor gas containing.

Table 1 shows the dimensional conditions of the droplet collecting tube and the measurement results of the presence or absence of water droplets discharged.

Example 2 When the exhaust gas flow rate was changed using the apparatus of Example 1, the presence or absence of discharged water droplets was observed, and the results are shown in Table 2.

Here, the exhaust gas conditions are as follows: Gas flow rate: 15 m/sec Gas temperature: 50°C Gas composition: Saturated steam gas containing 0.35 to 0.25 g/ffi of moisture.

Example 3 A drip collection pipe was attached to the top of a reinforced plastic (FRP) chimney with an inner diameter of approximately 2,000 am and a height of 80 m, and the presence or absence of water droplets released into the atmosphere was measured. The results are shown in Table 3. .

Here, the exhaust gas conditions are as follows: Gas flow rate: 1Bm/sec Gas temperature = 60°C Gas composition: Moisture 0.15g/I! ,,Moisture: 18v
o1%, SOX 30ppa+.

Table-1 Table-3 [Effects of the Invention] Since the present invention is constructed like a ridge, when the present invention is applied, the water droplets contained in the exhaust gas are removed from the normal exhaust gas flow velocity range (1
5 to 25 m/sec), and can prevent it from being released into the atmosphere as water droplets from the top of the chimney.As a result, it is possible to prevent stuck rain, and the social significance of pollution prevention is It's big enough to scratch.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the stuck rain prevention device according to the present invention. 1-・-・−・・−・−・ −・−・・−Chimney body 2・−・−・−1−−～・ −・−・Drip collecting pipe 3−;
・−−〜−−−・−−−・−・−・・Bottom plate 4−・
−・−・Drain pipe

Claims (1)

[Claims] A cylindrical chimney body having an inner diameter of d, and an annular bottom plate coaxially provided on the outside of the chimney body at a distance b downward from the top of the chimney body; In a stuck rain prevention device consisting of a drip collecting pipe having an inner diameter 2a larger than the inner diameter and a height c, and a drain pipe provided on the bottom plate, a/d is 0.1 or more and 0.5 or less, b/ The above stuck rain prevention device, wherein d is 0.1 or more and 0.5 or less, and c/d is 0.5 or more and 1.5 or less.