JPS589618Y2 - Device for injecting powdered chemicals into exhaust gas - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for blowing powdered chemicals into exhaust gas to uniformly disperse the chemicals in the exhaust gas when the treatment chemicals (powdered chemicals) are injected into the exhaust gas. .

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

Examples of harmful substances include evaporated vapors of heavy metals such as HCI, SOx, and NOx.

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 chemicals into the exhaust gas duct of an incinerator, or to attach an exhaust gas purification device to the incinerator to remove harmful substances.

If a wet purification device is installed for such exhaust gas treatment,
A treatment device for the waste liquid discharged from the purification device is additionally required, which ultimately increases costs and also complicates the operation method, maintenance method, etc.

For this reason, in recent years, dry purification equipment has been adopted as a way to eliminate the shortage caused by the wet method, but conventional dry purification equipment simply consisted of a powdered chemical injection pipe attached to the exhaust gas duct. Therefore, there is a problem that the powdered chemicals are not uniformly dispersed in the exhaust gas, and therefore a large amount of unreacted chemicals are entrained in the exhaust gas, which reduces the capacity of the electrostatic precipitator installed downstream. The amount of chemicals used had to be increased more than necessary, and there were also problems in terms of operating costs.

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 at three locations above and below an exhaust gas passage 2 inside the duct, a pair of chevron-shaped members 3.4 in a mutually overlapping state cross the passage 2 in the orthogonal direction and are spaced apart from each other in the exhaust gas flow direction. They are arranged parallel to each other.

Slanted wall 3A of each chevron-shaped member 3, 4. Comb blades 3a and 4a are formed at equal pitches over almost the entire length of 4A.

The ridge of the chevron-shaped member 3.4 faces upstream in the exhaust gas flow direction.

Reference numeral 6 denotes a powder chemical injection pipe, which faces one end of the gap S between the angle-shaped members 3 and 4.

Reference numeral 7 denotes a fixture for interconnecting the chevron-shaped members 3 and 4 and attaching them to the exhaust gas duct 1.

A part of the exhaust gas flowing through the exhaust gas passage 2 is distributed vertically by the chevron-shaped member 3, and first flows downstream through the gap between the comb blades 3a of the chevron-shaped member 3 on the upstream side.

Thereafter, it flows further downstream through the gap between the comb blades 4a of the chevron-shaped member 4 on the downstream side.

Therefore, an exhaust gas turbulent area is formed in the gap S between the chevron-shaped members 3 and 4, and a suction flow directed to the outside is generated from this area.

Since the powdered chemicals from the blowing pipe 6 are supplied to this portion, they are uniformly dispersed into the exhaust gas along with the suction flow.

The product 8 accumulates at the bottom of the exhaust gas duct 1.

As described above, according to the present invention, powdered chemicals are uniformly dispersed in the exhaust gas, so there is no need to consume a large amount of chemicals than necessary, and since the system is dry, operating costs and maintenance management are easy. .

Moreover, the performance of electric precipitators etc. is not reduced.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a cross-sectional view and FIG. 2 being a view taken along the line I--I in FIG. 1. 2... Exhaust gas passage, 3, 4... Angled member, 3A. 4A... Slanted wall, 3a, 4a... Comb blade, 6... Powder chemical injection pipe, S... Gap.

Claims (1)

[Scope of utility model registration request] A pair of chevron-shaped members arranged in a superimposed state at an increased interval in the exhaust gas flow direction and crossing the exhaust gas passage, and a powder chemical injection pipe facing one end of the gap between these chevron-shaped members, the pair of chevron-shaped members A device for injecting powdered chemicals into exhaust gas, characterized in that a comb blade is formed on each inclined wall of the exhaust gas.