JPS6113858B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for spraying a chemical such as slaked lime slurry or an aqueous solution into exhaust gas to remove harmful gases such as hydrogen chloride from the exhaust gas.

As a method for removing harmful gases (mainly hydrogen chloride) from exhaust gas generated from garbage incinerators and the like, a semi-dry method is known in which a slurry or aqueous solution of a harmful gas removal agent is sprayed into the exhaust gas. In this semi-dry method, the removal agent is made into a slurry or aqueous solution and is sprayed into the exhaust gas in a reaction tower.The spray agent reacts with harmful gases in the exhaust gas, and the reaction product is dried by the heat retained in the exhaust gas. It is removed from the exhaust gas as

FIGS. 1 and 2 show a conventional chemical spraying device installed in the reaction tower described above, which includes a gas distributor 2 that introduces exhaust gas from a flue 1 into the reaction tower 3. An atomizer main body 4 (the lower end of this main body is provided with a drug outflow portion 4a that allows the drug, for example, slaked lime slurry, introduced from the drug supply pipe 5 to flow out downward) and the atomizer main body 4 fixed inside the main body 4. A rotating disk 8 is provided with a gap 6 on the lower side and rotated at high speed by a central rotating shaft 7 passing through the main body 4, and this rotating disk 8 receives the medicine flowing out from the atomizer main body 4. A drug receiving chamber 9 whose upper end opening 9a communicates with the gap 6, and a plurality of outer circumferential nozzles 10 are provided for spraying the drug flowing into the chamber into the exhaust gas from the outer circumference of the disk by rotational centrifugal force. .

This chemical spraying device continuously supplies a chemical such as slaked lime slurry into the rotating disk 8 from the outflow portion 4a of the atomizer main body 4 little by little, and
Since the centrifugal force generated by the high-speed rotation of the disk 8 is used to atomize the exhaust gas from the outer nozzle 10, the inside of the disk 8 rotating at high speed has a negative pressure with respect to the surrounding pressure, and the surrounding exhaust gas flows between the rotating disk 8 and the atomizer body. It comes to be sucked in from the gap 6 between 4 and 4 as shown by the dotted line arrow in FIG. However, since the exhaust gas contains carbon dioxide gas, when the chemical is slaked lime slurry, this slaked lime and the carbon dioxide gas in the exhaust gas react in the rotating disk 8 to produce calcium carbonate, which is passed through the nozzle 10. There was a problem that the chemical adhered to the inner surface of the nozzle and blocked the nozzle, and in many cases, it became impossible to spray the chemical into the exhaust gas after about one month.

This invention was made for the purpose of solving the above-mentioned conventional problems, and includes providing a hood surrounding the atomizer body on the outside of the atomizer body, and having the lower end of the hood open to the lower end of the atomizer body.
An air supply pipe for blowing air from outside is connected to the space between the main body and the hood, and the blown air is blown out from an opening at the lower end of the hood to prevent exhaust gas from being sucked into the rotating disc under negative pressure. It is characterized by the fact that

An embodiment of this inventive device is shown below in Figs. 3 and 4.
Referring to the drawings, this embodiment is applied to the outside of the atomizer main body 4 in a drug spraying device similar to that shown in FIGS. A conical cylindrical hood 11 surrounding the outer periphery of the main body 4 is provided, and the lower end of the hood 11 with a reduced diameter is opened to the lower end of the atomizer main body 4, and the space between the main body 4 and the hood 11 is 12 is connected to an air supply pipe 13 for blowing in a large amount of air from the outside, and the blown air is blown out from an opening 14 at the lower end of the hood. (Only a part of the blown air is sucked into the disk 8 through the gap 6, and surrounding exhaust gas is prevented from being sucked into the air curtain 1.)
5).

Therefore, according to the device of the present invention, the problem of nozzle clogging due to intake of exhaust gas into the rotary disk 8 can be solved. Note that the diameter of the rotating disk 8 is
As shown in the figure, making the diameter larger than the tip diameter of the atomizer main body 4 was more effective in preventing exhaust gas from being sucked in.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional device, FIG. 2 is an enlarged sectional view of a main part of the same device, and FIGS. 3 and 4 are sectional views of main parts showing an embodiment of the present invention device. 1... Flue, 2... Gas distributor, 3... Reaction tower, 4... Atomizer body, 5
...Drug supply pipe, 6... Gap, 7... Rotating shaft, 8
...Rotating disk, 9...Drug receiving chamber, 10...Outer nozzle, 11...Hood, 12...Space, 13...
...Air supply pipe, 14...Hood lower end opening, 15
...Air curtain.

Claims (1)

[Claims] 1. It comprises an atomizer body having a medicine outflow part at the lower end which is fixed at a medicine spraying position into exhaust gas, and a rotating disk that rotates at high speed and is pivoted with a gap between the bottom of this body, In the atomizer, the rotating disk has a chamber for receiving the medicine flowing out from the atomizer body, and the medicine flowing into the chamber is sprayed into the exhaust gas from the outer peripheral nozzle part by rotational centrifugal force. A hood surrounding the main body is provided on the outside of the atomizer, the lower end of the hood is opened to the lower end of the atomizer main body, and an air supply pipe is connected to blow air from the outside into the space between the main body and the hood. A chemical spray device for removing harmful gases from exhaust gas, characterized in that air is blown out from an opening at the lower end of the hood to prevent exhaust gas from being sucked into a rotating disk under negative pressure.