JPS5832738Y2 - Chemical injection mixer in exhaust gas duct - Google Patents

Description

[Detailed description of the invention] The present invention relates to a chemical injection mixer into an exhaust gas duct for uniformly dispersing the treatment chemicals (powdered chemicals or liquid chemicals) into the exhaust gas. It is something.

When household garbage or industrial waste is incinerated, the exhaust gas contains various harmful substances.

Examples of harmful substances include HCl, SOx, NOx, and heavy metal vapors.

If these substances are released from chimneys without being treated, they will cause serious pollution such as air pollution.

In order to prevent pollution from occurring, it is common to introduce powdered or liquid chemicals into the exhaust gas duct of an incinerator, or to remove harmful substances by installing an exhaust gas purification device in the incinerator.

Conventionally, chemicals CaCO3, Cab, Ca(
When blowing in OH) 2 etc., squeeze the tip of the blowing pipe,
The exhaust gas and chemicals were mixed by changing the shape or by installing various contact plates in the airflow after blowing.
According to these methods, chemicals such as lime adhere to the insufflation pipe and cause clogging, making it impossible to obtain good operating conditions for a long period of time.

The present invention has been devised in view of the above, and examples thereof will be described below with reference to FIGS. 1 to 3.

Reference numeral 1 designates an exhaust gas duct of an incineration facility, and this exhaust gas duct 1 has a rectangular ring shape in cross section, and a horizontal drug blowing pipe 3 that is perpendicular to the exhaust gas pipe line 2 is provided on its side wall.

The blowing pipe 3 consists of an inner tube 3A and an outer tube 3B, and the drug that has exited the inner tube 3A is agitated inside the outer tube 3B and blown into the exhaust gas duct 1.

A flow dividing device 4 is installed immediately upstream of the chemical injection position S of the exhaust gas pipe 2.
is provided.

The flow dividing device 4 has surrounding frames 4a to 4e that form a plurality of branch channels 4A to 4E in the horizontal direction, and the rear ends of these surrounding frames 4a to 4e are close to the blowing pipe 3 on a horizontal virtual plane. Vertical flow divider plates 5A to 5 inclined with respect to the exhaust gas flow direction
E, a pair of upper and lower horizontal flow divider plates 5a and 5b which are inclined with respect to the exhaust gas flow direction so that the rear end portions of the vertical flow divider plates 5A to 5E approach each other; It consists of contact plates 6A to 6D that are arranged orthogonally to each other, and through lowers A to 7E are formed in each of the surrounding frames 4a to 4e so as to extend alternately in opposite directions.

In the illustrated embodiment, the blowing pipe 3 and the flow dividing device 4 are provided in two stages, upper and lower, but they may be provided in one stage or in two or more stages.

According to the above, in the pipe line 2, the exhaust gas is divided into a plurality of streams by the flow dividing device 4, and then mixed with the medicine injected from the blowing pipe 3.

In this case, when each exhaust gas branch passes through the passage lowers A to 7E, the vertical branch plates 5A to 5E and the horizontal branch plates 5a and 5b
After the exhaust gas is narrowed down, it diffuses, and the divided exhaust gas flows influence each other, resulting in a highly turbulent flow state.

Therefore, the mixture with the drug becomes good.

On the other hand, since the blow pipe 3 does not protrude into the exhaust gas turbulence area,
The blowing pipe 3 will not be clogged.

As described above, according to the chemical blowing mixer for the exhaust gas duct of the present invention, it is possible to maintain a high mixing ratio of the exhaust gas and the chemical for a long period of time without clogging the blowing pipe 3. In particular, since a fixed type is used as the flow dividing device 4 and there are no rotating parts, the structure is simple and difficult to break down, and it can be operated continuously for a long period of time.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, where Figure 1 is a vertical sectional side view, Figure 2 is a cross-sectional view taken along the line x-X in Figure 1, and Figure 3 is a Y-Y line in Figure 2. FIG. 1...Exhaust gas duct, 2...Exhaust gas pipe line, 3...Blowing pipe, 5A to 5E, 5a, 5b.
...Broadcast plate.

Claims (1)

[Scope of utility model registration request] The exhaust gas duct 1 is installed on the side wall of the exhaust gas duct 1 of the incineration equipment.
A drug injection pipe 3 is provided along the horizontal direction orthogonal to the exhaust gas pipe 2 formed in the gas pipe 2, and the drug injection position S of the gas pipe 2 is
A flow dividing device 4 is provided immediately upstream of the flow dividing device 4, and the flow dividing device 4 has surrounding frames 4a to 4e forming a plurality of branch flow paths 4A to 4E, and the rear ends of these surrounding frames 4a to 4e are connected to the blower. Vertical flow divider plate 5A inclined with respect to the exhaust gas flow direction so as to be close to the pipe 3
5E, a pair of upper and lower horizontal flow divider plates 5a and 5b that are inclined with respect to the exhaust gas flow direction so that the upper and lower end portions of these vertical flow divider plates 5A to 5E approach each other, and A chemical injection mixer for an exhaust gas duct, comprising contact plates 6A to 6d provided to be orthogonal to each other, and through lowers A to 7E formed in each of the surrounding frames 4a to 4e.