JPS59179134A - Chemical agent spraying device for removing harmful gas in waste gas - Google Patents

Abstract

PURPOSE:To prevent the clogging of a nozzle by providing blades above the upper surface of a rotating disc, supplying air into the inner side of the rotating part of the blades of an atomizer main body, and preventing the blowing in of a waste gas into the rotating disc by the evacuating performance of the rotating blades. CONSTITUTION:In a chemical agent spraying device for removing harmful gas in a waste gas, radial blades 11 which rotate as one body with a disc 8 is provided above the upper surface of the rotating disc 8. An air introducing passage 12 which supplies air into the inner side of the rotating blades and is opened in the air is provided to the main body 4 of an atomizer. When the blades 11 air rotated as one body with the disc 8 at a high speed, the air is blown into the inner side of the rotating blades from said passage 12 and exhausted towards the circumference and outwards with air at a space between said body 4 and the disc 8. Therefore, the waste gas is not blown into the disc 8 and the clogging of a nozzle 10 due to attachment of CaCO3 or the like produced by the reaction of CO2 in the waste gas with a chemical agent such as slaked lime slurry to the inner surface of the nozzle 10 can be prevented.

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 IIJ is added to the exhaust gas in the reaction tower.
In the tN method, the atomized chemical reacts with harmful gases in the exhaust gas and is removed from the exhaust gas as reaction products dried by the retained heat of the exhaust gas.

FIGS. 1 and 2 show a conventional chemical spraying device installed in the reaction tower mentioned above. An atomide main body 4 (a drug flow part 4a is provided at the lower end of the main body to allow the drug introduced from the drug supply pipe 5 to flow downward from the slaked lime streak 9.-f); A rotating disk 8 is provided below the main body 4 with a gap 6 therebetween and is rotated at high speed by a central rotating shaft 7 passing through the main body 4.
- indicates a drug receiving chamber 9 whose upper end opening 9a that receives the drug flowing out from the atomizer main body 4 communicates with the gap 6, and the drug flowing into this chamber is sprayed into the exhaust gas from the outer circumference of the disk by rotational centrifugal force. A plurality of peripheral nozzles 10 are provided.

This chemical spraying device continuously supplies a chemical such as slaked lime sly into the rotating disk 8 from the outlet 4a of the atomizer main body 4 little by little, and the centrifugal force caused by the high speed rotation of the disk 8 causes the outer periphery to be sprayed. Since the exhaust from the nozzle 10 is sprayed into the air, the inside of the disk 8 rotating at high speed becomes a negative pressure (compared to the ambient pressure), and the surrounding exhaust gas flows into the gap between the rotating disk 8 and the atomizer body 4. From 6 onwards, it begins to be inhaled as shown by the dotted line arrow in Figure 2. (2. The exhaust gas (=) contains carbon dioxide gas, so if the chemical is slaked lime nullary, this slaked lime and the exhaust gas The carbon dioxide inside reacted in the rotating disk 8 to produce calcium carbonate, which adhered to the inner surface of the nozzle 10 and blocked the nozzle. In many cases, it became impossible to spray the medicine.

This invention has been made to solve the above-mentioned conventional problems, and includes a blade that rotates integrally with the rotating disc on the top surface of the rotating disc, and a blade that rotates integrally with the disc, and the atomizer main body has a blade that rotates integrally with the rotating disc. It is characterized in that an air introduction path is provided which is open to the atmosphere to completely prevent surrounding exhaust gas from being sucked into the rotating disk through the gap due to the exhaust effect caused by the rotation of the blades. be.

Hereinafter, an embodiment of the device according to the present invention will be explained with reference to the drawings in FIGS. 3 and 4. This embodiment is a device for spraying a chemical into exhaust gas (same (The same reference numerals are given to the parts and the specific explanation is omitted), a radial grade 1 is provided on the upper surface of the rotating disk 8 and rotates integrally with the disk, and the atomide main body 4 is provided with a blade rotating portion. is provided with an air introduction path 12 that is open to the atmosphere and supplies air to the inside of the air introduction path 1.
2 is a drug outflow part 4a'l on the lower surface of the atomide main body 4.
An annular air groove 128 recessed to surround the annular air groove 128, a plurality of air introduction holes 12b whose lower ends are open to the annular air groove 12a and whose upper ends are open into the atomide main body 4, and each of the air introduction holes 128. It is composed of a plurality of air pipes 12C whose lower ends are connected to the holes 12b and whose upper ends penetrate the earthen wall of the atomizer main body 4 and are exposed to the atmosphere (2).

When the blade JJ751 rotates together with the rotating disk 8 at high speed, air is sucked into the rotating portion of the blade from the air introduction passage 12 which is open to the atmosphere, and the air flows between the main body 4 and the rotating disk 8. Since the air in the gap 6 is discharged to the outside in the circumferential direction, surrounding exhaust gas is no longer sucked into the rotating disk 8 through the gap 6.

Since the chemical spraying device for removing harmful gases from exhaust gas according to the present invention is as described above, it is possible to solve the problem of nozzle clogging caused by surrounding exhaust gas being sucked into the rotating disk, and it can be used for a long period of time. Continuous operation is now possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional device, FIG. 2 is an enlarged cross-sectional view of the main part of the same device, FIG. 3 is a cross-sectional view of the main part showing an embodiment of the inventive device, and FIG. - It is a cross-sectional plan view along the N line. 1... Flue, 2... Gas distributor-13
... Reaction tower, 4... Atomizer main body, 5... Drug supply pipe, 6...-Gap, 7...- Rotating shaft, 8... Rotating disk, 9... Drug receiving chamber, 10...outer nozzle,
1)...Blade, 12...Air introduction path. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] The atomide main body has a drug outlet at the lower end that is fixed at the position where the drug is sprayed into the exhaust gas, and a rotating disk that rotates at high speed is mounted on the lower side of the main body with a gap therebetween, In the spray device, the rotating disk has a chamber for receiving the drug flowing out from the main body of the atomide, and is configured to atomize the drug flowing into the chamber from the outer peripheral nozzle part into the exhaust gas by rotating centrifugal force. A blade that rotates integrally with the disc is provided on the upper surface, and an air introduction path that is open to the atmosphere and supplies air to the inside of the blade rotating portion is provided on the atomizer main body, so that the rotation of the blade (= A chemical spraying device for removing harmful gases from exhaust gas, characterized in that the exhaust action prevents surrounding exhaust gas from being sucked into a rotating disk.