JP3517298B2 - Flue gas desulfurization equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet desulfurization type flue gas desulfurization apparatus for simultaneously removing dust and sulfur oxides contained in exhaust gas from boilers, incinerators, onshore and marine diesel engines using fossil fuels. Regarding

[0002]

Boilers using fossil fuels, incinerators,
Exhaust gas from land and marine diesel engines contains a relatively large amount of dust and sulfur oxides, and exhausting them into the atmosphere poses a pollution problem. Therefore, various flue gas desulfurization devices have been developed to solve this problem.

As a conventional flue gas desulfurization apparatus, for example, one described in Japanese Patent Application Laid-Open No. 6-285328 previously filed by the applicant of the present application is known. In this device, the inside of the desulfurizer has one end in the lateral direction, the center and the other end in that order, a gas inlet for the processing gas is formed in the upper part, and a gas outlet is formed in the lower part. Is connected to the gas inlet chamber where the spray nozzle is installed, and the gas outlet of the gas inlet chamber is provided with a substantially cylindrical eddy current generating portion on the upper side of the upstream side, and the upper end portion is downward on the downstream side. A gas that is connected to an eddy current processing chamber provided with a curved upper inclined passage portion and an upper inclined passage portion of the eddy current processing chamber to form a gas outlet for the treated gas at the upper portion, and further has a mist separator provided inside the chamber. It is divided into three chambers including a discharge chamber, and a liquid pool portion for storing the desulfurization treatment liquid ejected from the spray nozzle and the dust removed from the treatment gas is provided below the desulfurizer.

The processing gas passes through the gas inlet of the desulfurizer through the gas introduction chamber and contacts the desulfurization processing liquid supplied into the vessel on the way to the sulfur oxide contained in the processing gas. Is absorbed and then blown out from the gas outlet in the lower part of the gas introduction chamber into the vortex processing chamber, and this processing gas and atomized desulfurization treatment liquid form a vortex in the vortex generation section, and the vortex generation section is formed by centrifugal force. A liquid film is formed by hitting the surface, dust contained in the processing gas is collected in the liquid film,
The processing gas and some mist-like desulfurization processing liquid, which was stored in the liquid pool at the bottom of the container and was almost processed after that, also formed a liquid film on the formation surface of the upper inclined passage part of the vortex processing chamber. After desulfurization and dust collection, the treated gas sent from the upper sloped passage to the gas discharge chamber is discharged to the outside from the gas outlet after the mist separator filters the mist-like desulfurization treatment liquid and dust. To be done.

[0005]

By the way, when the processing gas containing a large amount of dust is processed, the desulfurization processing liquid ejected from the spray nozzle is provided in the lower part of the gas introduction chamber.
A large amount of dust is washed off. However, in the conventional flue gas desulfurization apparatus, the guide plate, which is the lower wall of the upper inclined passage portion of the vortex processing chamber, is welded to the bottom surface of the liquid pool portion of the desulfurizer. , A high flow velocity is obtained, and the desulfurization treatment liquid and dust are vigorously ejected from the gas outlet into the swirl treatment chamber, and ascend up the upper inclined passage along the guide plate to be pumped to the gas discharge chamber. If the amount of gas decreases, the momentum of ejection from the gas outlet to the swirl processing chamber decreases, and dust easily accumulates on the bottom surface of the desulfurizer and the lower end portion of the guide plate. As a result, the gas outlet may be blocked by the accumulated dust, and the pressure loss may increase.

The present invention has been made against the background of the above-mentioned problems of the prior art. It is possible to prevent dust from accumulating in the vicinity of the gas outlet in the lower part of the gas introduction chamber, and to prevent an increase in pressure loss due to dust accumulation. An object of the present invention is to provide a flue gas desulfurization device that can be used.

[0007]

A flue gas desulfurization apparatus according to claim 1, wherein the inside of the desulfurizer is a gas inlet for processing gas at the upper part in the order of one end, the center and the other end in the lateral direction. However, a gas outlet is formed in the lower part, and a gas introduction chamber in which a spray nozzle for desulfurization treatment liquid is provided in the chamber and a gas outlet of the gas introduction chamber are communicated with each other, and a substantially cylindrical shape is provided in the upper part on the upstream side. -Like eddy current generating portion is provided, and the upper end of the eddy current processing chamber is connected to the eddy current processing chamber in which an upper inclined passage portion whose upper end portion curves downward is provided on the downstream side and the upper inclined passage portion of the eddy current processing chamber. The gas outlet of the used gas is divided into a gas discharge chamber, and in the lower part of the desulfurizer, there is a liquid pool part for storing the desulfurization treatment liquid ejected from the spray nozzle and the dust removed from the treatment gas. In the flue gas desulfurization equipment provided, the lower part of the gas introduction chamber A partition plate that raises the gas outlet from the liquid reservoir to the upper part of the swirl generating chamber, and a bottom plate of the liquid reservoir and a lower wall of the upper inclined passage of the swirl processing chamber. A dust discharge gap is formed between the lower end of a certain guide plate, and the jetted desulfurization treatment liquid and the treatment gas are introduced into the vortex flow generating portion of the vortex flow treatment chamber near the gas outlet of the partition plate. It is characterized in that a rectifying plate is provided.

The flue gas desulfurization apparatus according to claim 2 is
The flue gas desulfurization apparatus according to claim 1, wherein the liquid pool is provided with a waste liquid part for holding the water level of the liquid pool above the lower end of the guide plate.

Further, the flue gas desulfurization apparatus according to a third aspect is the drain flue gas desulfurization apparatus according to the first aspect, wherein the drain is for discharging the dust accumulated on the bottom surface of the liquid pool to the liquid pool. It is configured to provide a section.

[0010]

In the flue gas desulfurization apparatus according to any one of claims 1 to 3,
The treated gas passes through the gas inlet chamber of the desulfurizer through the gas introduction chamber and comes into contact with the desulfurization treatment liquid supplied into the container during this process, and the sulfur oxide contained in the treatment gas is absorbed in the liquid. Then, the flow velocity is increased from the gas outlet in the lower part of the gas introduction chamber and the gas is blown into the swirl processing chamber. At this time, the treatment gas and the atomized desulfurization treatment liquid are introduced into the vortex flow generating portion of the vortex flow treatment chamber by the flow straightening plate provided near the gas outlet of the partition plate, and become a vortex in the vortex flow generating portion,
Due to the centrifugal force, a liquid film is formed by hitting the surface on which the vortex flow generating portion is formed, and the dust contained in the processing gas is collected in the liquid film and stored in the liquid pool portion at the bottom of the container.

After that, the treatment gas which has been almost treated and some of the mist-like desulfurization treatment liquid also form a liquid film on the surface where the upper inclined passage portion of the swirl treatment chamber is formed to desulfurize and collect dust. The processed gas that has been carried out and is subsequently sent from the upper inclined passage portion to the gas discharge chamber is discharged to the outside from the gas outlet. During gas processing containing a large amount of dust, the amount of processing gas is temporarily reduced, and the momentum ejected from the gas outlet to the swirl processing chamber decreases, and the dust collected in the liquid film tilts upward along the guide plate. When a situation where the passage cannot be raised occurs, dust is guided by the guide plate and falls between the partition plate and the guide plate, and from there, it is formed between the bottom surface of the liquid pool and the lower end of the guide plate. Since the dust flows from the dust discharge gap into the liquid reservoir without any trouble, it is possible to prevent dust from accumulating in the vicinity of the gas outlet in the lower part of the gas introduction chamber, and to prevent an increase in pressure loss due to dust accumulation.

Further, in the flue gas desulfurization apparatus according to the second aspect, even if a large amount of desulfurization treatment liquid is accumulated in the liquid pool portion, the excess amount is discharged to the outside by the waste liquid portion, so that the water level in the liquid pool portion is increased. Are held near the lower end of the guide plate.

Further, in the flue gas desulfurization apparatus according to the third aspect, when dust is accumulated in the liquid pool, the dust is discharged from the drain part provided on the bottom surface of the liquid pool.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in FIG. 1, a flue gas desulfurization apparatus 10 according to an embodiment of the present invention has a desulfurizer 20 and a desulfurizer 2
The inside of 0 is a gas introduction chamber 30, a vortex processing chamber 40, and a gas discharge chamber 5 in the order of one end, the center, and the other end in the lateral direction.
Further, at the lower part of the desulfurizer 20, there is provided a liquid pool 60 for collecting dust c removed from the desulfurization treatment liquid a and the treatment gas b.

The gas introduction chamber 30 is a chamber partitioned by a wall plate on one end side of the desulfurizer 20 and a vertical plate 31 which is separated by a predetermined distance from the wall plate, and has a gas inlet 30a for the processing gas b at the upper portion.
However, a gas outlet 30b is formed in the lower part, and a spray nozzle 32 for injecting the desulfurization treatment liquid a downward is provided in the upper part of the room. As the desulfurization treatment liquid a, for example, a slurry-like mixture of a mixture of an absorbent such as limestone or slaked lime and an absorption product such as gypsum or calcium sulfite, or an absorbent such as magnesium oxide or magnesium sulfite and the absorption product. It is possible to employ a solution or slurry of a mixture with magnesium sulfate, magnesium sulfite, etc., but other alkali salt solutions can also be employed.

The eddy current processing chamber 40 has a substantially cylindrical eddy current generating portion 41 arranged in the upper portion on the upstream side, and an upper inclined passage arranged in the downstream side, the upper end portion of which is curved downward in an arc shape. And part 42. The vortex flow generating portion 41 is partitioned by a curved plate 43 having a C-shaped cross section whose one end is fixed near the central portion of the vertical plate 31 and whose lower portion is opened. In addition, the upper inclined passage portion 42 rises from the other end that is rolled up inward of the curved plate 43, and temporarily rises to the desulfurizer 2
It is composed of an upper passage plate 44 which extends to the center upper end of 0 and then descends in an arc shape, and a guide plate 45 which rises along the upper passage plate 44 from a position slightly above the bottom surface of the desulfurizer 20. The upper end of the passage plate 44 and the upper end of the guide plate 45 form a downward discharge port 40a.

The gas discharge chamber 50 is communicated with the discharge port 40a of the upper inclined passage portion 42 of the swirl processing chamber 40, and the gas outlet 50a of the processed gas b'is formed in the upper part thereof. Also,
In the vicinity of the lower portion of the side wall plate of the gas discharge chamber 50, the liquid pool 6
A waste liquid portion 52 with an on-off valve 51 for maintaining the water level of 0 at a height slightly above the lower end of the guide plate 45 so as to seal the blow-through of gas is provided. A drain portion 62 with an opening / closing valve 61 for discharging the accumulated dust c is provided on the bottom surface of the liquid pool portion 60.

Here, the feature of the flue gas desulfurization apparatus 10 of the present invention is that the partition plate 70 which raises the gas outlet 30b from the liquid reservoir 60 from the lower part of the gas introduction chamber 30 to the upper upstream part of the swirl processing chamber 40 is provided. Is provided and the liquid pool 60
A dust discharge gap d is formed between the bottom surface of the partition plate 70 and the lower end of the guide plate 45, and the desulfurization treatment liquid a and the treatment gas b ejected near the gas outlet 30b of the partition plate 70 are discharged from the swirl treatment chamber 40. The point is that a short rectifying plate 71 that is inclined upward and is introduced into the vortex flow generating portion 41 is provided. The partition plate 70 is a plate material in which the vicinity of the middle portion is bent downward at a right angle, and a relatively wide gap e is provided between the partition plate 70 and the guide plate 45.
Are formed.

Next, a flue gas desulfurization apparatus 1 according to one embodiment of the present invention
The operation of 0 will be described. As shown in FIG. 1, when the treatment gas b containing sulfur oxides and dust is introduced into the flue gas desulfurization apparatus 10 from the gas inlet through a duct (not shown), the treatment gas b is discharged from the desulfurizer 20. The gas is introduced from the gas inlet 30a to the gas introduction chamber 30, where the desulfurization treatment liquid a is injected from the spray nozzle 32, and a part of the sulfur oxide in the treatment gas b is absorbed.

Next, the gas outlet 30 of the gas introduction chamber 30
In b, for example, the processing gas b and the atomized desulfurization processing liquid a accelerated to 10 m / s or more are accelerated and blown out into the vortex flow generating portion 41 of the vortex flow processing chamber 40 by the rectifying plate 71, and the centrifugal force The inside of the face plate 43 is in a vacuum state, and a vortex is generated by the end portion of the curved plate 43. This allows
A liquid film of the desulfurization treatment liquid a is formed on the entire inner surface of the vertical plate 31 and the curved plate 43, and the dust c in the processing gas b is collected in the liquid film by the action of centrifugal force. The treatment gas b flowing along the guide plate 45 entrains the mist of the desulfurization treatment liquid a and forms a liquid film of the desulfurization treatment liquid a on the curved plate 43 and the guide plate 45 as a whole. And dust is removed. After that, the treatment gas b which has been almost treated and some desulfurization treatment liquid a form a liquid film also on the surface where the upper inclined passage portion 42 is formed to desulfurize and collect the dust c. The treated gas b ′ blown out from the discharge port 40a of the upper inclined passage portion 42 to the lower side of the gas discharge chamber 50 drops the remaining desulfurization treatment liquid a and dust c into the liquid reservoir 60, and the gas discharge chamber The gas is discharged from the gas outlet 50a of 50.

The dust c collected at each part is
Eventually, the liquid falls from the discharge port 40a of the upper inclined passage 42 into the liquid reservoir 60, or once into the gap e between the partition plate 70 and the lower portion of the guide plate 45, or on the inner surface of the guide plate 45. After sliding down along this gap e, it flows out to the liquid reservoir 60 from the dust discharge gap d formed between the bottom surface of the liquid reservoir 60 and the lower end of the guide plate 45. Then, the open / close valve 61 is opened to discharge it to the outside through the drain portion 62.

By the way, during the gas treatment containing a large amount of dust c, the amount of the treatment gas b is temporarily reduced, and the momentum ejected from the gas outlet 30b to the vortex flow treatment chamber 40 is reduced and collected in the liquid film. The dust c moves along the guide plate 45 and the upper inclined passage portion 4
When it is not possible to raise 2, the dust c is guided by the guide plate 45 and falls between the partition plate 70 and the guide plate 45, and flows into the liquid pool 60 from the dust discharge gap d without any trouble. The dust c can be prevented from accumulating in the vicinity of the lower gas outlet 30b, and the pressure loss due to the accumulation of the dust c can be prevented from increasing.

Even if the desulfurization treatment liquid a containing a large amount of dust c is accumulated in the liquid reservoir 60, the excess amount thereof is discharged to the outside by the waste liquid portion 52 having the open / close valve 51 opened.
The water level of the liquid pool 60 can be maintained near the lower end of the guide plate 45.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and the present invention includes a design change and the like without departing from the scope of the invention. For example, the shapes of the gas introduction chamber, the vortex treatment chamber and the gas discharge chamber of the desulfurizer may not be limited to those of the embodiment.

In the embodiment, the spray nozzle provided in the gas introduction chamber of the desulfurizer is oriented downward.
The present invention is not limited to this, but may be upward. Further, a well-known mist separator made of, for example, a laminated body of glass wool or wire mesh may be provided at a predetermined position of the gas discharge chamber to remove a desulfurization treatment liquid or dust contained in a small amount in the treated gas. .

[0027]

In the flue gas desulfurization apparatus according to the first to third aspects of the invention, the partition plate with the straightening plate disposed near the gas outlet from the lower part of the gas introduction chamber to the upper part of the upstream of the vortex flow generating part. Since a dust discharge gap is formed between the bottom surface of the liquid reservoir and the lower end of the guide plate, it is possible to prevent dust from accumulating near the gas outlet in the lower part of the gas introduction chamber, and It is possible to prevent an increase in pressure loss.

Further, in the flue gas desulfurization apparatus according to the second aspect, even if a large amount of desulfurization treatment liquid is accumulated in the liquid reservoir,
Since the excess is discharged to the outside by the discharge part, the water level in the liquid pool can be held above the lower end of the guide plate.

Further, in the flue gas desulfurization apparatus according to the third aspect, when dust accumulates in the liquid pool, the dust is discharged from the drain part provided on the bottom surface of the liquid pool, so the liquid pool Good dust discharge.

[Brief description of drawings]

FIG. 1 is a sectional view of a flue gas desulfurization apparatus according to an embodiment of the present invention.

[Explanation of symbols]

10 Flue gas desulfurization equipment 20 desulfurizer 30 gas introduction chamber 30a gas inlet 30b Gas outlet 32 spray nozzles 40 Eddy current processing chamber 41 Eddy current generator 42 Upper inclined passage 52 Waste liquid department 60 Liquid pool 62 Drain section 70 Partition Board 71 Current plate a Desulfurization treatment liquid b Processing gas b'treated gas c dust

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B01D 50/00 502 B01D 53/18 E 53/18 53/34 125Q 53/34 ZAB ZAB 53/77 (72) Inventor Anjong Taketoshi 2-1, Okawa-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Mitsubishi Kakoki Co., Ltd. (72) Inventor Megumi Taguchi 2-1, Okawa-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Mitsubishi Kakoki Co., Ltd. (56) References Special Kaihei 6-285328 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B01D 50/00 B01D 53/14-53/18 B01D 53/34-53/85 B01D 47/00 F01N 3/00

Claims (3)

(57) [Claims] 1. A desulfurization process is performed inside a desulfurizer in which a gas inlet for a processing gas is formed in an upper part and a gas outlet is formed in a lower part in the order of one end, a central part and the other end in a lateral direction. A gas introducing chamber provided with a spray nozzle for liquid and a gas outlet of the gas introducing chamber are connected to each other, a substantially cylindrical vortex flow generating portion is provided at an upper portion on an upstream side, and an upper end portion is provided on a downstream side. A vortex flow treatment chamber provided with an upper inclined passage portion that curves downward,
The desulfurization unit is connected to the upper inclined passage of the swirl treatment chamber and is divided into a gas discharge chamber having a gas outlet of the treated gas formed at the upper portion, and desulfurization ejected from the spray nozzle at the lower portion of the desulfurizer. In a flue gas desulfurization device provided with a liquid pool part for collecting dust removed from the processing liquid or the processing gas, from the lower part of the gas introduction chamber to the lower upstream part of the swirl processing chamber, the gas blowing from the liquid pool part A partition plate that raises the outlet bottom is provided, and the bottom surface of the liquid pool section,
A dust discharge gap is formed between the swirl treatment chamber and the lower end of the guide plate which is the lower wall of the upper inclined passage portion, and the jetted desulfurization treatment liquid and the treatment are provided in the vicinity of the gas outlet of the partition plate. A flue gas desulfurization apparatus comprising a rectifying plate for introducing gas into a vortex flow generating portion of the vortex flow processing chamber. 2. The flue gas desulfurization apparatus according to claim 1, wherein a waste liquid portion that holds the water level of the liquid pool portion above the lower end of the guide plate is provided in the liquid pool portion. 3. The flue gas desulfurization apparatus according to claim 1, wherein the liquid pool portion is provided with a drain part for discharging the dust accumulated on the bottom surface of the liquid pool portion.