JPH0522027U - Exhaust gas treatment tower - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the size of the entire device. [Structure] In a cylindrical outer tower 1 having a closed upper end 1a,
A cylindrical inner tower 2 having an open upper end 2a is housed in a substantially concentric manner with respect to the outer tower 1, and the outer tower 1 is provided on the lower side of the outer circumference of the outer tower 1.
The exhaust gas inlet duct 3 extending in the tangential direction of the inner tower 2 is connected to the outer tower 1. A spray nozzle 6 for injecting the absorbing liquid 12 is provided at a position. Therefore, the distance in which the gas and liquid come into contact with each other becomes large.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tower for treating exhaust gas such as boiler exhaust gas.

[0002]

[Prior Art]

 Since exhaust gas such as boiler exhaust gas contains harmful substances such as sulfur oxides, it has been conventionally performed to remove the harmful substances by wet method before discharging the exhaust gas to the atmosphere.

An example of a conventional exhaust gas treatment tower for wet-removing harmful substances is shown in FIG.

In the figure, a is a vertical tower body, b is a spray pipe arranged in multiple stages in the upper part of the tower body a, c is a lower portion of the spray pipe b, and is arranged at a required interval in the longitudinal direction, and A plurality of spray nozzles adapted to eject the absorbing liquid d, e is an exhaust gas inlet provided in the lower part of the tower body a, f is an exhaust gas outlet provided in the upper part of the tower body a, and g is an exhaust gas outlet A flue connected to f, h is an absorption liquid reservoir formed in the lower part of the tower body a, i is an absorption liquid discharge pipe for discharging the absorption liquid d accumulated in the absorption liquid reservoir h, and j is a harmful substance Exhaust gas containing, and k is exhaust gas from which harmful substances have been removed.

In the above-mentioned exhaust gas treatment tower, the exhaust gas j containing harmful substances including harmful substances is introduced into the tower body a through the exhaust gas inlet e and rises in the tower body a.

On the other hand, the absorbing liquid d, which is fed through the spray pipe b and jetted downward from the spray nozzle c, comes into gas-liquid contact with the exhaust gas j rising in the tower main body a, and the harmful substances in the exhaust gas j are The flue gas k which has been removed and cleaned by removing harmful substances has the mist of the absorbing liquid removed by an eliminator or the like, and is then discharged from the flue gas outlet f to the flue g. Further, the absorbing liquid d which has absorbed the harmful substance falls to the absorbing liquid reservoir h in the tower body a, is subjected to treatment such as neutralization, and is then sent to the spray nozzle c again.

[0007]

[Problems to be solved by the device]

 As described above, in order to remove harmful substances in the exhaust gas j by gas-liquid contact, it is necessary to secure a distance at which the gas-liquid is in contact, but the exhaust gas j rises almost straight inside the tower body a. Therefore, in order to obtain a desired gas-liquid contact distance, there is a problem that the height l from the upper end of the exhaust gas inlet e to the highest-class spray pipe b becomes high, which causes an increase in the size of the device.

The present invention has been made in view of the above circumstances, and is intended to reduce the size of the apparatus.

[0009]

[Means for Solving the Problems]

 According to the present invention, a cylindrical outer tower with an open upper end is housed in a cylindrical outer tower with the upper end closed, in a substantially concentric manner with respect to the outer tower. , The exhaust gas inlet duct extending in the tangential direction of the outer tower is connected, and the exhaust gas outlet duct extending in the radial direction of the inner tower is connected to the lower part of the outer periphery of the inner tower, and the required position inside and outside the inner tower A spray nozzle for injecting the absorbing liquid is provided on the inside.

[0010]

[Action]

 Exhaust gas introduced from the exhaust gas inlet duct into the outer tower rises while swirling along the inner circumference of the outer tower, changes direction at the upper part, enters the inner tower from the open upper end of the inner tower, and exits the inner tower. It descends and is discharged to the exhaust gas outlet duct. Therefore, even if the height of the outer tower and the inner tower is low, it is possible to increase the contact distance between the absorbing liquid injected from the spray nozzle and the exhaust gas.

[0011]

【Example】

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

1 to 3 show an embodiment of the present invention.

In the figure, 1 is a cylindrical outer tower whose upper end 1 a is closed, 2 is a cylindrical inner tower which is concentrically housed in the outer tower 1 and whose upper end 2 a is open, 3 is An exhaust gas inlet duct 4 which is tangentially connected to the lower part of the outer periphery of the outer tower 1 and extends horizontally penetrates the lower part of the outer tower 1 and is radially connected to the outer periphery of the inner tower 2. A horizontally extending exhaust gas outlet duct, 5 are a plurality of annular spray pipes concentrically arranged on the upper end 1a of the outer tower 1 and the lower surface in the vicinity thereof, and the inner and outer peripheral portions of the inner tower 2, and 6 are each spray pipe. 5, a plurality of spray nozzles obliquely installed in the vertical direction and arranged at required intervals in the circumferential direction; and 7 is an absorption device installed below the bottom surfaces of the outer tower 1 and the inner tower 2. The liquid storage tank 8 has an upper end connected to the bottom surface of the exhaust gas inlet duct 3 so as to communicate with the exhaust gas inlet duct 3. The lower end is the absorbent discharge pipe inserted into the absorbent 12 in the absorbent tank 7, and the upper end 9 is connected to the bottom surface of the exhaust gas outlet duct 4 so as to communicate with the exhaust gas outlet duct 4 and the lower end is the absorbent. Absorbing liquid discharge pipe inserted into absorbing liquid 12 in reservoir 7; 10 is exhaust gas containing harmful substances; 11 is exhaust gas from which harmful substances are removed; 13 is an air blowing pipe provided in absorbing liquid reservoir 7. is there.

The exhaust gas 10 containing harmful substances is introduced into the outer tower 1 through the exhaust gas inlet duct 3 along the inner circumference of the outer tower 1. Therefore, the exhaust gas 10 rises while spirally swirling between the outer tower 1 and the inner tower 2, changes its direction immediately below the upper end 1a of the outer tower 1, and from the open upper end 2a of the inner tower 2. It is introduced into the inner tower 2 and descends in the inner tower 2. During the ascent and descent, it comes into contact with the absorbing liquid 12 sprayed from the spray nozzle 6 to absorb and remove harmful substances, and the exhaust gas outlet from the lower end of the inner tower 2 It is discharged to the duct 4.

On the other hand, the absorbing liquid 12 in the absorbing liquid storage tank 7 is pressure-fed to each spray pipe 5 by a pump (not shown), and the spray nozzle 6 provided in each spray pipe 5 causes the inside of the outer tower 1 and the inner tower. 2 is injected.

Since the exhaust gas 10 comes into contact with the absorbing liquid 12 that is ejected when moving up or down in the outer tower 1 and the inner tower 2 as described above, and the harmful substances contained in the exhaust gas 10 are absorbed, The exhaust gas 11 discharged to the exhaust gas outlet duct 4 is a clean gas containing no harmful substances.

The absorbing liquid 12 that has absorbed the harmful substances contained in the exhaust gas 10 falls to the bottom of the outer tower 1 and the inner tower 2, flows along the bottom to the exhaust gas inlet duct 3 and the exhaust gas outlet duct 4, and the absorbing liquid is discharged. It is returned from the pipes 8 and 9 to the absorbing liquid storage tank 7. Since the lower ends of the absorbing liquid discharge pipes 8 and 9 are inserted into the absorbing liquid 12 accumulated in the absorbing liquid storage tank 7, the absorbing liquid 12 functions as a seal, so that the exhaust gas 10 or 11 absorbs the absorbing liquid discharge pipe. There is no leakage from 8 and 9 to the outside.

The absorption liquid 12 returned to the absorption liquid reservoir 7 absorbs harmful substances by oxidizing and neutralizing sulfite by the air blown from the air blowing pipe 13 and recovers the absorption capacity again. The liquid 12 is supplied to the spray nozzle 6 again.

When the exhaust gas 10 rises in the outer tower 1, the exhaust gas 10 rises while turning, and also descends in the inner tower 2 concentrically provided with respect to the outer tower 1. Even if the height of the tower 2 is low, the distance in which the gas and liquid are in contact can be sufficiently set, and the harmful substances can be removed efficiently.

Among the droplets of the absorption liquid 12 ejected from the spray nozzle 6, those having a relatively large particle diameter, which has a relatively small ground surface area and therefore has a poor gas-liquid contact efficiency for absorption reaction, swirls. The gas flow easily pushes against the inner peripheral wall of the outer cylinder 1. Therefore, the draft pressure loss due to gas-liquid contact can be relatively small in terms of absorption performance.

Moreover, since the heights of the outer tower 1 and the inner tower 2 may be low, the overall size of the device can be reduced.

In the embodiment of the present invention, the case where the spray pipe is formed into an annular shape has been described. However, the spray tube may be formed into a rectangular shape without forming an annular shape, and a spray nozzle may be provided on the inner peripheral surface of the outer tower. Needless to say, various changes can be made without departing from the scope of the present invention.

[0023]

[Effect of the device]

 According to the exhaust gas treatment tower of the present invention, the excellent effect that the entire apparatus can be downsized can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of an exhaust gas treatment tower of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a plan view of a spray pipe and a spray nozzle applied to the exhaust gas treating tower of the present invention.

FIG. 4 is a vertical cross-sectional view of an example of a conventional exhaust gas treatment tower.

[Explanation of symbols]

 1 Outer Tower 1a Upper End 2 Inner Tower 2a Upper End 3 Exhaust Gas Inlet Duct 4 Exhaust Gas Outlet Duct 6 Spray Nozzle 12 Absorbing Liquid

Claims (1)

[Scope of utility model registration request] 1. A cylindrical outer tower having a closed upper end,
A cylindrical inner tower having an open upper end is housed in a substantially concentric manner with respect to the outer tower, and an exhaust gas inlet duct extending in the tangential direction of the outer tower is connected to the outer peripheral lower side portion of the outer tower. An exhaust gas outlet duct extending in the radial direction of the inner tower is connected to the outer peripheral lower part,
An exhaust gas treatment tower, characterized in that spray nozzles for injecting an absorbing liquid are arranged at required positions inside and outside the outer tower.