JP2549604Y2 - Exhaust gas treatment equipment - 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 treatment apparatus for removing an SOx-containing gas in an exhaust gas from a boiler before releasing the gas to the atmosphere.

[0002]

2. Description of the Related Art SOx in exhaust gas discharged from a boiler
As a conventional exhaust gas treatment apparatus for removing contained gas, there is one as shown in FIG. That is, spray devices 3 are arranged in multiple stages at an upper position in a processing tower 1 having a required height with an exhaust gas inlet 2 provided on one side of a lower position. Are connected with a circulating pump 4 and a circulating line 5, and after the absorbent 6 in the treatment tower 1 is guided from the circulating line 5 to the spray devices 3 in each stage by the circulating pump 4, the liquid flows downward from the spray devices 3 And the exhaust gas G rising from the exhaust gas inlet 2 into the processing tower 1 is brought into contact with the absorbent 6 ejected from the spray device 3 to perform desulfurization treatment. Further, a mist eliminator 7 is provided above the spraying device 3 to remove mist of the desulfurized gas, and a gas mist eliminator 7 is connected to a gas discharge port 8 at the top of the tower. In the middle of release line 9 Those bets eliminator 7 configuration provided is employed.

[0003]

However, in the case of the above-mentioned conventional exhaust gas treatment tower, the pressure loss is large due to the gas flow bending, rapid expansion, and rapid contraction, and one or more high-performance mist eliminators 7 are used. Since two units are required, the size of the apparatus is large, and the number of spraying apparatuses 3 for the absorbing liquid 6 is multi-stage and the height of the head is sufficiently large.
Are large, tall, expensive, and difficult to spread worldwide.

Accordingly, the present invention is to provide an exhaust gas treatment apparatus capable of desulfurization and mist removal with a simple configuration instead of the above-mentioned conventional treatment tower.

[0005]

According to the present invention, in order to solve the above-mentioned problems, the exhaust gas duct is arranged in a horizontal state so that the gas flow becomes a horizontal flow, and the exhaust gas duct is U-shaped in a horizontal plane. In the gas flow path at the upstream side of the bent portion, a plurality of spray devices for ejecting the absorbing liquid are provided in the gas flow direction, and a hopper is provided on the bottom surface of the bent portion. The hopper and each of the spray devices are connected via a circulation pump and a circulation line.

[0006]

When the untreated exhaust gas flows into the exhaust gas duct at a high speed from the upstream side to the downstream side, and at the same time the absorbing liquid is ejected from the nozzle of each spray device toward the gas flow path, the exhaust gas becomes U
The desulfurization reaction is performed by contact with the absorbing liquid just before reaching the bent portion in the shape of a letter, thereby performing desulfurization treatment. In the bent portion, the mist is blown outward and removed by the centrifugal effect. The gas desulfurized and treated with mist is taken out from the downstream side.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention, in which an exhaust gas duct 10 is placed horizontally and bent in a U-shape in a horizontal plane, and one end of the bent portion 11 is located on the upstream side. The exhaust gas G is caused to flow at a high speed from the upstream side a to the downstream side b with the other end side as the downstream side b. A plurality of spray devices 12 are arranged on the side wall portion and the ceiling portion on the upstream side of the bent portion 11 so as to be arranged in multiple rows in the gas flow direction. A desulfurization reaction section A is set in the flow path, and a hopper 1 is provided at the bottom of the bent section 11.
4 is provided so that the absorbing liquid 15 can be stored, and the hopper 14 and each of the spray devices 12 are connected by a circulating pump 16 and a circulating line 17 so that the absorbing liquid 15 can be circulated and used. At least the bent part 1
Except for 1 and the desulfurization reaction section A, the upstream side A and the downstream side B of the exhaust gas duct 10 are inclined obliquely upward so that the bent portion 11 and the desulfurization reaction section A become a reservoir for the absorbent 15. .

The direction of the nozzle 13 may be such that the absorbing liquid 15 can be ejected in a direction opposite to the gas flow toward the upstream side in the gas flow direction. The flow may be parallel to the gas flow. or,
You may arrange | position a piping in a flow path, and may spray an absorption liquid.

At the same time as the untreated exhaust gas G is introduced into the exhaust gas duct 10 from the upstream side A and flows therethrough, each spray device 1
2 is ejected from the nozzle 13 into the gas flow path in the form of droplets or liquid film, the exhaust gas G flowing at high speed
Is brought into contact with the absorbing liquid 15 in the desulfurization reaction section A, and the absorbing liquid 15 is blown toward the bent portion 11 by the flow velocity of the gas.
At this time, the sulfur content in the exhaust gas is removed and desulfurization treatment is performed.

The gas passing through the desulfurization reaction section A and the absorbing liquid 15 carried by the gas reach the bent portion 11 bent in a U-shape. Since it is bent while being hit against the inner surface of the side wall and flows downstream, the mist is mechanically and hydrodynamically removed when passing through the bent portion 11. The higher the gas flow rate, the more effectively the mist is removed due to the centrifugal effect of the mist.

Next, FIG. 4 shows another embodiment of the present invention, in which a spray device 12 is arranged at a first half position of a bent portion 11, and this portion is used as a desulfurization reaction section A.

In this embodiment, the direction of ejection of the absorbing liquid ejected from the spray device 12 into the gas flow path is directed toward the upstream side of the gas flow, so that the absorbing liquid 15 is formed by the gas flow as shown in the figure. Since the absorbing liquid is brought into the outer zone in the bending part 11 where the gas is loaded by the bending part 11 and the gas processing load becomes large, the gas and the absorbing liquid come into intense contact with each other.
The desulfurization reaction will be actively performed.

The present invention is not limited to the embodiment described above. For example, the number of the spray devices 12 may be other than that shown in the drawing. It is necessary to reliably contact the absorbing liquid with the gas flowing through the exhaust gas duct 10. Therefore, it is necessary to determine the size according to the size of the exhaust gas duct 10. A corresponding mist eliminator can be unnecessary, but it goes without saying that a simple mist eliminator may be used if installed.

[0015]

As described above, according to the exhaust gas treatment apparatus of the present invention, the exhaust gas duct is placed horizontally and bent in a U-shape, and the gas flow is located upstream of the U-shaped bent portion. Since a desulfurization reaction section is provided by installing a channel and a spray device for ejecting the absorbing liquid, the following excellent effects can be obtained. (i) By contacting the gas flowing at a high flow rate in the exhaust gas duct with the absorbing liquid ejected from the spray device, the gas is desulfurized while flowing while scattering the absorbing liquid, so that a large reaction zone can be obtained. . (ii) Since the gas only flows through the exhaust gas duct, the pressure loss is smaller than in the conventional example. (iii) Since the exhaust gas duct has a simple structure in which the exhaust gas duct is placed horizontally, it can be easily installed in the existing flue, and the foundation for installation can be made small. (iv) Since it is a horizontal type, the circulating pump head is small, and the operating cost can be greatly reduced. (v) In the bent portion, mist separation can be effectively performed by the centrifugal force effect of the rapid swirling motion of the gas, and the mist eliminator on the downstream side is unnecessary or simple. (vi) Compact and low equipment cost.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is an enlarged view taken along a line III-III in FIG. 2;

FIG. 4 is a partial view showing another embodiment of the present invention.

FIG. 5 is a schematic side view of a conventional exhaust gas treatment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Exhaust gas duct 11 Bent part 12 Spray device 14 Hopper 15 Absorbent liquid 16 Circulation pump 17 Circulation line A Desulfurization reaction part A Upstream side B Downstream side G Exhaust gas

Claims (1)

(57) [Scope of request for utility model registration] An exhaust gas duct is placed horizontally and bent in a U-shape in a horizontal plane, and at an upstream position of the U-shaped bent portion,
A desulfurization reaction section is provided by installing a spray device for ejecting the absorbing liquid into the gas flow path, and a hopper for storing the absorbing liquid is provided at the bottom of the bent portion. An exhaust gas treatment device, wherein the exhaust gas treatment device is connected via a connection.