JP3124081B2 - Dispersion method of packed tower spray - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas cleaning apparatus such as a wet flue gas desulfurization apparatus, and more particularly to a method of spraying an absorbing liquid in a packed tower for cleaning exhaust gas.

[0002]

2. Description of the Related Art A conventional method of spraying a spray in a packed tower will be described with reference to FIG. In FIG.
Absorbent A stored in 6 is pumped up by a pump 107, and the absorbent A flowing into the nozzle 101 from the spray header 102 is ejected upward from the tip of the nozzle 101 as a rod-shaped liquid column, and reaches a height corresponding to the ejection dynamic pressure. after, which fall freely spread in an umbrella shape, and dispersed in the absorption tower 104. wash the exhaust gas with the exhaust gas B and gas-liquid contact while wetting the packing 105 provided spray headers <br/> 102 lower It is. In the drawing, reference numeral 103 denotes a stirrer installed in the liquid reservoir 106, and B 'denotes purified exhaust gas.

[0003]

As described above, it is not possible to disperse the liquid into fine droplets simply by ejecting the liquid upward, and even if the ejection height is increased by increasing the ejection amount. Although the absorption efficiency at the highest point rises in relation to the amount of liquid injected, the efficiency during the injection rise process is small, and the increase in absorption efficiency during the injection rise process increases the free fall amount and height of the absorbent. However, the efficiency is reduced in terms of the input power. In addition, an increase in the injection amount has a drawback such as an increase in the height of the absorption tower, and in order to compensate for this drawback, it is necessary to increase the nozzle diameter or increase the number and fill a lot of packing material. there were.

[0004] In view of the above-mentioned state of the art, the present invention aims to provide a method for dispersing a packed tower spray which does not have a problem as in the prior art.

[0005]

SUMMARY OF THE INVENTION In the present invention, when the absorbing liquid is sprayed from a plurality of spray nozzles provided upward and the exhaust gas is subjected to gas-liquid contact treatment, the absorbing liquid jetted vertically from the nozzle is sprayed onto the nozzle. A method of dispersing a packed tower spray, characterized in that the packed tower spray is made to collide with a collision body provided on the upper part of the column.

[0006]

According to the present invention, as described above, the absorbing liquid ejected from the nozzle in the vertical direction collides with the colliding body provided at the upper part of the nozzle, and is made into fine droplets and dispersed, thereby passing through the gap between the colliding bodies. Exhaust gas and the microdrops come into violent gas-liquid contact.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will first be specifically described with reference to the embodiment shown in FIG. In FIG. 1, an absorbent AA pumped from a liquid reservoir 6 by a circulation pump 7 is jetted in a vertical direction from a plurality of nozzles 1 provided on a spray header 2, and is provided directly above an injection port of the nozzle 1. The colliding body 8 collides with the untreated exhaust gas BB introduced into the absorption tower 4, and vigorously comes into gas-liquid contact to wash the exhaust gas. In FIG. 1, 3 is a stirrer, 4 is an absorption tower, 5 is a packing, and BB 'is a purified exhaust gas.

FIG. 2 shows an example of a cross-sectional shape of one embodiment of the collision body 8. In FIG. 2, the top 9 of the collision body 8 was machined to an acute angle, and the bottom 10 was also sharpened. The angle of the bottom 10 was adjusted according to the dispersion condition.

Hereinafter, the present invention will be described in detail with reference to an embodiment in which the apparatus according to the embodiment shown in FIG. 1 is used and a comparative example using the apparatus according to the conventional embodiment shown in FIG.

(Embodiment) Air to which 780 ppm of SO ₂ was added was introduced from the top of the 1400 m ³ N absorption tower per hour,
A gypsum slurry containing 45 mmol / liter of calcium carbonate was sprayed to a 250 m ³ absorption tower per hour by a circulation pump. At this time, four nozzles having an inner diameter of 60 mm were used to spray the absorbing liquid onto the absorption tower having a cross section of 1 m ² , and the collision body was 200 mm thick, 1500 mm high and 1 width wide with respect to the 1 m square absorption tower.
Two pieces having a size of 000 mm, a top angle of 60 °, and a bottom angle of 90 ° were provided 700 mm above the injection port of the nozzle. Under the above conditions, the measurement of the SO ₂ concentration under the spray header is 11
It was 0 ppm. Further, the absorbing liquid jetted from the nozzle did not scatter above the upper end of the collision body.

(Comparative Example) A test was carried out under the same conditions by removing the collision body from the above apparatus, and the result of measurement of the SO ₂ concentration under the spray header was 232 ppm as in the above. Also, at this time, the ejection height of the absorbing liquid ejected from the nozzles was about 2 to 2.3 m although there were some variations in the ejection height of the nozzles.

[0012]

According to the present invention, as described above, the jetting / absorbing liquid from the nozzle is made to collide with the collision body provided above the nozzle to be dispersed into fine droplets, thereby improving the desulfurization performance and increasing the height of the absorption tower. It is possible to reduce the size.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment example of the present invention.

FIG. 2 is a sectional view of the collision body in FIG. 1;

FIG. 3 is an explanatory view of a conventional embodiment.

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 53/18 B01D 53/34 B01D 53/77-53/79 B01J 19/26

Claims (1)

(57) [Claims] 1. A when to gas-liquid contact process the spraying to exhaust the absorbed liquid from a plurality of spray nozzles provided in the upward, 該No the absorption liquid which is injected in a vertical direction from the nozzle
A method for dispersing a spray in a packed tower, which comprises colliding with an colliding body provided on top of a chirle .