JPS5862422A - Chimney - Google Patents

Abstract

PURPOSE:To wash the inner wall of a cylinder body at all times by installing a mist separator to the top section of the cylinder body and ejecting a washing liquid toward the mist separator. CONSTITUTION:Exhaust gas containing moisture is induced by means of flow deviating plates 11 and turned in the spiral direction, mists remaining in exhaust gas collide with a net 12 by the action of centrifugal force, moisture is caught by means of the net 12, and exhaust gas, from which moisture is removed, is diffused into atmospheric air from the upper opening section 8 of a box body 10. The washing liquid is ejected at every fixed time from sprays 7, 16, the washing liquid is blown against the flow deviating plates 11 and net 12 of the mist separator 6, corrosive components adhering on the plates and net are washed away, and the drain water is recovered from a drain pipe 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chimney for use in conjunction with a humid flue gas desulfurization system.

Wet flue gas desulfurization equipment is often used to remove harmful components, especially sulfur compounds, contained in heavy oil combustion gas and municipal waste combustion gas. The so-called wet method is a method in which the target gas is brought into contact with a liquid and the corrosive components contained in the gas are absorbed into the liquid. Conventionally, this moisture-containing gas is treated with a mist separator and then released from a chimney. There was a problem in that the saturated water vapor introduced into the chimney condensed within the chimney because it was dissipated into the atmosphere, and this adhered to the inner wall of the chimney L7 and corroded the inner wall of the chimney. In other words, the mist flowing into the chimney is absorbed and concentrated by the moisture adhering to the inner wall of the chimney, and the pH of the mist reaches a maximum of 0.6, which causes the materials that make up the chimney body to corrode in a short period of time. It was considered unavoidable that maintenance and management would be a hassle. In particular, it was believed that almost no countermeasures could be taken for the chimneys used for municipal waste incinerators.

The present invention solves the above-mentioned problems by blowing exhaust gas containing supersaturated water vapor that has been processed by a wet flue gas desulfurization device into the cylinder of a chimney, blowing up mist upwards, and creating water droplets separated from the gas. A liquid film is formed on the inner wall of the cylinder body, and the drain water is used to constantly clean the inner wall of the cylinder body.A mist separator is installed at the top of the cylinder body, and the cleaning liquid is directed toward the n9-st separator directly below it. It is characterized by being equipped with a nozzle that emits water. Embodiments of the present invention will be described below with reference to the drawings. In Fig. 1, an inner cylinder 5 made of metal or reinforced plastics is installed vertically inside an outer cylinder 1 made of reinforced concrete, supported by a support 2, and an opening is opened at the bottom of the inner cylinder 3. A duct 5 connected to a wet flue gas desulfurization device 4 is connected to the inlet 3a. A mist separator 1 is installed at the top of the inner cylinder 3, and a strip 7 for spouting cleaning liquid toward the mist separator 2 is placed directly below it.

The mist separator 6 has the following configuration. That is, %Figure 2 (A 1, (r: 4, hollow housing 1 with 6 mist separators and upper and lower openings 8 and 9)
0, the drift 'Fj11,11. ... are installed radially, and a net 12 for capturing mist is stretched on the inner wall of the body of the housing 10. A slope 16 is attached to the lower opening edge of the casing 10, and a drain hole 15 is formed in the willow 14 provided at the lower end of the opening 17, and a drain vibe 16 connected to the opening 17 is passed between the inner and outer cylinders 3.2 to the base of the chimney. Piping to the outside.

Further, a spout 1/-16 is installed in the housing 10 to spray cleaning liquid toward the net 12 on the inner wall of the body. The housing 10 of this sepa1-notaro is seated on the outer cylinder 1''2, and the lower opening 9 is connected to the upper edge of the inner cylinder 3.

However, the structure of the mist separator d is not limited to the above structure, and any structure may be used as long as it can remove the mist in the exhaust gas discharged through the barrel of the inner cylinder 6.

In the embodiment, exhaust gas emitted from a single-fuel oil boiler or the like is desulfurized by a wet desulfurization device 4, and is blown into an inner cylinder 6 through a duct 5. After desulfurization, the exhaust gas contains supersaturated water vapor and becomes round.
When the exhaust gas blows up, the force causes the mist in the gas to be blown upward inside the inner cylinder 2, and the inside of the inner cylinder 2 is filled with supersaturated water vapor over its entire length. Here, as the fine mist contained in the exhaust gas is blown upward by the exhaust gas, droplets gradually grow and increase in weight while floating in the exhaust gas, and the weight increases due to the blowing force of the exhaust gas. The liquid is pushed out in the outer circumferential direction by centrifugal force, adheres to the inner wall surface of the inner cylinder 3 over its entire length, forms a liquid film, and flows down as drain water. This action occurs over the entire length of the inner cylinder 3,
The wall surface of the inner cylinder 6 is cleaned.

The inside of the inner cylinder 3 is filled with supersaturated water vapor contained in the continuously supplied exhaust gas, which flows down while condensing to form a uniform liquid film on the wall surface. This prevents the adhesion of corrosive components and the concentration of those components.The excess duct flowing out from the upper end of the inner cylinder 3 is captured by the mist separator 1-6. ),
At 1 port 1, the exhaust gas containing moisture is guided by the deflection plate 11 and turns in a spiral direction, and the duct remaining in the exhaust gas collides with the net 12 due to centrifugal force 1-1 The moisture flows into the net 1
The exhaust gas trapped in the housing 2 and from which moisture has been removed is released into the atmosphere through the upper opening 8 of the housing 1o. The water droplets captured by the net 12 are collected from the gutter 14 through the drain vibe 15 to the outside of the chimney, and the water that has fallen along the inner wall of the broken inner cylinder 6 is also collected from its base to the outside. Ru. In addition, the spray 7.16 sprays cleaning liquid at regular intervals t7, sprays this cleaning liquid onto the drift plate 11 and net 12 of the mist separator 6 to wash away corrosive components attached to these, and drains the drain water from the drain vibrator 15. to recover. Therefore, it is convenient to install a timer 7 in the piping of each knob 7.15 so as to operate the spray 7.15 at regular intervals. The mist separator 6 is connected to the inner cylinder 3
This is to remove excess moisture remaining in the exhaust gas after forming a liquid film on the wall of the Mist Separator. It is important to clean each part of the mist separator B because the corrosive components in the exhaust gas are absorbed into the water droplets adhering to the mist separator B and become concentrated. The net 12 still traps particles such as soot contained in the exhaust gas, so it is necessary to periodically clean it.

In the present invention, in order to form a uniform liquid film on the wall surface of the inner cylinder 3, it is necessary to fill the inner cylinder 3 with supersaturated water vapor. When the amount of water vapor in the exhaust gas is insufficient, such as in a high-rise chimney, a sprayer 17 is installed at the bottom of the inner cylinder 3,
The cleaning liquid may be ejected from the spray 17 and mixed into the exhaust gas.

As described above, the present invention constantly cleans the inside of the cylinder body of the inner cylinder 3, removes excess moisture with the mist separator 6 installed at the top of the inner cylinder 3, and washes the mist separator 17-6 with cleaning water as appropriate. Because of this, 5US-31 is applied to the entire barrel.
It is now possible to make chimneys that do not corrode using low-grade stainless steel such as 6L, and even chimneys for incinerating municipal waste, which were previously considered impossible even with the use of superalloy stainless steel, can be made with 5US-516L. It is possible to obtain sufficient corrosion resistance by using low-grade stainless steel such as, and has the effect of significantly increasing the durability of the chimney and making it easier to maintain and manage the chimney.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of the chimney of the present invention, and Figure 2 (
1 is an enlarged sectional view of the mist separator 17-ta, (b) is the mark A
-A sectional view. 3... Inner cylinder (tube body) 6... Mist separator 7... Spray patent applicant Yoshibao Take, agent Patent attorney Naka Kanno (7)

Claims (1)

[Claims] (1) A chimney characterized in that a mist separator is installed at the top of the cylinder body, and a sprayer is installed directly below the mist separator to spray a cleaning liquid toward the mist separator.