KR20190073784A - Wet desulfurization apparatus capable of improving desulfurization efficiency and wet desulfurization method using the same - Google Patents

Abstract

The present invention relates to a wet type desulfurization device capable of improving desulfurization efficiency by dividing a chamber of the desulfurization device into an inner chamber and an outer chamber and controlling the moving speed of exhaust gas and the spray amount of alkaline slurry to perform a desulfurization treatment, and a wet type desulfurization method using the same. For the above, the wet type desulfurization device includes: a chamber which is divided into an inner chamber and an outer chamber by installing a partition wall, has an exhaust gas inlet so that exhaust gas including sulfur (S) flows into the outer chamber, and has an exhaust gas outlet so that exhaust gas where sulfur (S) is removed is discharged through the inner chamber; a slurry storage unit which is positioned in the lower part of the chamber, and receives and stores alkaline slurry; a first slurry spray unit which is positioned in the outer chamber, receives the alkaline slurry stored in the first slurry storage unit, and sprays the received alkaline slurry to exhaust gas; a second slurry spray unit which is positioned in the inner chamber, receives the alkaline slurry stored in the slurry storage unit, and sprays the received alkaline slurry to exhaust gas; and a mist removal unit which is positioned in the upper end of the inner chamber and removes the moisture of the exhaust gas where sulfur (S) is removed by passing through the second slurry spray unit. The exhaust gas containing sulfur is introduced into the exhaust gas inlet, passes sequentially through the outer chamber and the inner chamber, and then is discharged to the exhaust gas outlet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet desulfurization apparatus capable of improving desulfurization efficiency and a wet desulfurization apparatus using the same,

The present invention relates to a wet desulfurization apparatus capable of improving desulfurization efficiency and a wet desulfurization method using the same. More particularly, the present invention relates to a wet desulfurization apparatus capable of improving the desulfurization efficiency by separating a chamber of an desulfurization apparatus into an inner chamber and an outer chamber, The present invention relates to a wet desulfurization apparatus capable of improving desulfurization efficiency by controlling the injection amount and desulfurizing the same, and a wet desulfurization method using the same.

Generally, a wet desulfurization apparatus using limestone (CaCO ₃ ) is mainly used as a method of treating sulfur oxides (SO _x ) and acid gases contained in the flue gas. Although the wet desulfurization apparatus has a relatively high initial investment cost It is used mainly in large facilities because it has the advantage of low operation and maintenance cost. In addition, limestone (CaCO ₃ ) is widely used in a desulfurization apparatus because it has a merit that it can be used at low cost unlike relatively expensive products such as caustic soda (NaOH), which is an alkaline substance produced in Korea.

In the conventional wet desulfurization apparatus (see FIG. 1), the acid gas is absorbed through the gas-liquid contact in the chamber after the untreated gas is introduced into the desulfurizer, and the absorbed acid gas is treated by the alkaline slurry in the following reaction sequence And the alkaline slurry is recirculated and re-sprayed.

SO ₂ (g) + H ₂ O → H ₂ SO ₃ (aq) (1)

H ₂ SO ₃ (aq) ↔ H ⁺ + HSO ₃ ^- ↔ 2H ⁺ + SO ₃ ^2- (2)

Ca ²⁺ + SO ₃ ^2- ↔ CaSO ₃ (3)

At this time, the sulfur oxides (SO _x) by absorption in an alkaline slurry is reproduced as gypsum (CaSO ₄ · 2H ₂ O) through a process as below.

O ₂ (g) O ₂ (aq) (4)

HSO ₃ ^- + 1/2 O ₂ ^- & gt ^; H ⁺ + SO ₄ ^2- (5)

SO ₄ ^2- + 1/2 O ₂ --SO ₄ ^2- (6)

CaCO ₃ (s) + 2H ^{+ -} & gt ^; Ca ²⁺ + H ₂ O + CO ₂ (7)

Ca ^{2 +} + SO ₃ ^2- + 1/2 H ₂ O → CaCO ₃ · 1/2 H ₂ O (s) (8)

Ca ^{2 +} + SO ₄ ^2- + 2H ₂ O? CaSO ₄ .2H ₂ O (s) (9)

On the other hand, while the pH levels for increasing the pH level and the gypsum purity to eliminate the sulfur oxides in the exhaust gas is there is a difference, in general, the pH inside the slurry wet desulfurizer 4.0 to improve the quality of the gypsum in the 5.0 range in the SO ₂ It is known that the absorption rate is reduced and the absorption rate of SO ₂ is improved when the pH is maintained at 5.0 or more, but the quality of the gypsum can be deteriorated.

However, the conventional wet desulfurization apparatus (see FIG. 1) has a problem in that the desulfurization efficiency is lowered by spraying the slurry into a flue gas passing through a single path (lower and upper direction) after stirring the slurry using a stirrer in the desulfurizer Therefore, development of a wet desulfurization apparatus capable of improving the desulfurization efficiency is required.

Korean Patent Publication No. 10-0906805

It is an object of the present invention to provide a wet desulfurization apparatus capable of improving desulfurization efficiency and a wet desulfurization method using the same.

These and other objects and advantages of the present invention will become apparent from the following description of a preferred embodiment.

The object of the present invention is achieved by providing an exhaust gas purifying apparatus for purifying exhaust gas, which is provided with a partition wall and divided into an inner chamber and an outer chamber and has an exhaust gas inlet for introducing an exhaust gas containing sulfur S into an outer chamber, A chamber having an exhaust gas outlet for discharging the exhaust gas; A slurry storage unit disposed in the lower portion of the chamber for storing and storing the alkaline slurry; A first slurry spraying unit located in the outer chamber for spraying the alkaline slurry stored in the slurry storage unit to the exhaust gas; A second slurry spraying unit located in the inner chamber and supplied with the alkaline slurry stored in the slurry storage unit and spraying onto the exhaust gas; And a mist eliminator disposed at an upper end of the inner chamber to remove moisture of the exhaust gas having passed through the second slurry spraying section and removed sulfur (S), wherein the exhaust gas containing sulfur is introduced into the exhaust gas inlet port, And then discharged to the exhaust gas outlet after sequentially passing through the chamber.

At this time, it is preferable that the volume of the inner chamber is larger than the volume of the outer chamber.

The slurry reservoir may include a slurry supply pipe for supplying the alkaline slurry, an oxygen gas supply pipe for supplying the oxygen gas, and an agitator for agitating the alkaline slurry stored therein.

The first slurry spraying unit may include a spray pipe having a plurality of spray nozzles for spraying the alkaline slurry supplied from the slurry storage unit, and the spray pipe is formed in multiple stages in the vertical direction of the outer chamber.

The second slurry jetting unit may include a jetting pipe having a plurality of jetting nozzles for jetting the alkaline slurry supplied from the slurry storing unit, and the jetting pipe is preferably formed in multiple stages in the vertical direction of the inner chamber .

The mist removing unit may include an upper support frame fixed to the inner wall of the inner chamber, a lower support frame fixed to the inner wall of the inner chamber, and a lower support frame attached to the upper support frame and the lower support frame, The bending plate may have a vertex of a vertical plate protruding in one direction, a valley in the form of a vertical plate protruding to the other side, and upper and lower end portions, respectively, and are fastened to the upper support frame and the lower support frame And a connection portion having an oblique plate shape connecting the connecting portion of the vertical plate shape and the mountain portion and the valley portion in diagonal directions or connecting the mountain portion and the connecting portion or the connecting portion in the diagonal direction.

The mist removing unit may include an upper supporting frame, a lower supporting frame, and a mist attached to the bending plate by spraying downward the alkaline slurry supplied from the slurry storing unit. And a mist removing pipe for removing the mist.

The wet desulfurization apparatus may further include a slurry feed amount control unit for controlling an amount of feeding the alkaline slurry stored in the slurry storing unit to at least one of the first slurry spraying unit, the second slurry spraying unit and the mist removing unit.

In this case, the second slurry spraying unit may include a spray pipe having a plurality of spray nozzles for spraying the alkaline slurry supplied from the slurry storage unit, and the spray pipe is formed in multiple stages in the vertical direction of the inner chamber, It is preferable that the slurry transfer amount control unit controls the transfer of the greatest amount of slurry to the spray pipe at the uppermost position and the transfer of the smallest amount of slurry to the spray pipe at the lowest position.

The mist removing unit may include an upper support frame fixed to the inner wall of the inner chamber, a lower support frame fixed to the inner wall of the inner chamber, and a lower support frame attached to the upper support frame and the lower support frame, The bending plate may have a vertex of a vertical plate protruding in one direction, a valley in the form of a vertical plate protruding to the other side, and upper and lower end portions, respectively, and are fastened to the upper support frame and the lower support frame The mist removing unit may include a connecting portion having a vertical plate-shaped connecting portion, a mountain portion and a valley in an oblique direction, or a connecting portion having an oblique plate shape connecting the mountain portion and the connecting portion or the valley portion and the connecting portion in an oblique direction, And is provided with a plurality of spray nozzles, and is supplied with the alkaline slurry from the slurry storage portion The four may be provided with a mist removal pipe for removing the mist attached to the upper support frame, the lower support frame and a flexure plate.

The above object is also achieved by a wet desulfurization method for removing sulfur (S) in an exhaust gas using the above-described wet desulfurization apparatus, comprising: a first step of introducing an exhaust gas containing sulfur (S) into an outer chamber through an exhaust gas inlet ; A second step of supplying the alkaline slurry stored in the slurry storage unit to the first slurry spraying unit; A third step of injecting the alkaline slurry supplied from the first slurry spraying unit into the outer chamber through the flue gas inlet and spraying the flue gas forming the downward air stream to remove the sulfur S; A fourth step of supplying the alkaline slurry stored in the slurry storage unit to the second slurry spraying unit; A fifth step of injecting the alkaline slurry supplied to the second slurry spraying unit into the inner chamber through the outer chamber, and injecting the alkaline slurry into the flue gas forming the ascending air stream to remove the sulfur S; A sixth step of removing water from the flue gas from which sulfur (S) has been removed by using a mist removing unit; And a seventh step of discharging sulfur (S) and dehydrated flue gas.

At this time, it is preferable that the moving speed of the exhaust gas forming the downward airflow in the third step is higher than the moving speed of the exhaust gas forming the upflow air in the fifth step.

It is preferable that the second slurry jetting unit of the fifth step includes a plurality of jetting nozzles and jetting the alkaline slurry supplied from the slurry storing unit and includes a multi-stage jetting pipe formed in the vertical direction of the inner chamber, It is preferable to control so that the largest amount of slurry is transferred to the formed injection pipe and the smallest amount of slurry is transferred to the injection pipe formed at the bottom.

According to the present invention, it is possible to improve the desulfurization efficiency by separating the chamber into the inner chamber and the outer chamber using the partition, and adjusting the moving speed of the exhaust gas and the injection amount of the alkaline slurry.

Specifically, it is preferable that the moving speed of the primary desulfurized exhaust gas is controlled to be slow, the slurry spraying part (injection pipe) is formed in a multistage, and the amount of slurry transferred to each spray pipe is varied to improve the desulfurization efficiency .

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a conventional wet desulfurizer.
2 is a schematic illustration of a cross-section of a wet desulfurizer in accordance with an embodiment of the present invention.
3 is a schematic illustration of a chamber according to an example.
4 is a schematic view of a cross section of a wet desulfurizer according to an embodiment of the present invention.
5 is a schematic view illustrating a mist removing unit according to an example.
6 is a schematic illustration of a cross section of a wet desulfurizer according to one embodiment of the present invention.
Figure 7 is a schematic illustration of a cross-section of a wet desulfurizer according to one embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

Also, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains and, where contradictory, Will be given priority.

In order to clearly illustrate the claimed invention, parts not related to the description are omitted, and like reference numerals are used for like parts throughout the specification. And, when a section is referred to as "including " an element, it does not exclude other elements unless specifically stated to the contrary. In addition, "part" described in the specification means one unit or block performing a specific function.

In each step, the identification code (first, second, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, and each step does not explicitly list a specific order in the context May be performed differently from the above-described sequence. That is, each of the steps may be performed in the same order as described, or may be performed substantially concurrently or in the reverse order.

2 is a schematic view of a wet desulfurization apparatus according to an embodiment of the present invention. 2, a wet desulfurization apparatus according to an embodiment of the present invention includes partition walls 13 and is divided into an inner chamber C2 and an outer chamber C1, and the outer chamber C1 is divided into sulfur (10) having an exhaust gas inlet (11) for introducing an exhaust gas containing sulfur (S) into the inner chamber (C2) and having an exhaust gas outlet (12) for exhausting the exhaust gas through which the sulfur (S) has been removed through the inner chamber (C2); A slurry storage part 20 located below the chamber 10 for storing and storing an alkaline slurry; A first slurry spraying unit 30 located in the outer chamber C1 and supplied with the alkaline slurry stored in the slurry storage unit 20 and spraying the same to the exhaust gas; A second slurry spraying unit 35 located in the inner chamber C2 and supplied with the alkaline slurry stored in the slurry storage unit 20 and spraying the same to the exhaust gas; And a mist eliminator (40) located at an upper end of the inner chamber (C2) and passing moisture through the second slurry spraying part (35) to remove moisture of the exhaust gas from which the sulfur (S) has been removed, Is introduced into the flue gas inlet 11 and sequentially passed through the outer chamber C1 and the inner chamber C2 and then discharged to the flue gas outlet 12.

The present invention improves the desulfurization efficiency by separating the chamber 10 into the inner chamber C2 and the outer chamber C1 by using the partition wall 13 and controlling the moving speed of the exhaust gas and the amount of spray of the alkaline slurry It has the effect of being able to. That is, while the conventional wet desulfurization apparatus is a single upward downward path, the present invention is characterized in that the incoming flue gas forms a down stream and is subjected to a first desulfurization process, followed by a second upward desulfurization process, Can be improved.

The chamber 10 is partitioned into an inner chamber C2 and an outer chamber C1 with a partition wall 13 provided therein in a vertical direction (which means a reference upper and lower reference in FIG. 2), and the outer chamber C1 The exhaust gas outlet 12 may be provided to allow the exhaust gas containing sulfur S to flow through the inner chamber C2 and to discharge the exhaust gas from which the sulfur S has been removed through the inner chamber C2. can do. A first slurry spraying unit 30 for spraying an alkaline slurry to remove sulfur inside the flue gas, and a second slurry spraying unit 30 for spraying an alkaline slurry to remove sulfur in the flue gas. The second slurry spraying portion 35 is located in the outer chamber C1 and the inner chamber C2 and is provided with a mist removing portion 35 for removing water from the exhaust gas having passed through the second slurry spraying portion 35, 40 are positioned at the upper end of the inner chamber C2. At this time, it is preferable that both the inner chamber C2 and the outer chamber C1 are cylindrical. That is, the inner chamber C2 and the outer chamber C1 are provided in a cylindrical shape, and the exhaust gas inlet 11 is provided in the tangential direction of the outer chamber C1 so that the exhaust gas flowing into the exhaust gas inlet 11 flows into the inner chamber C2, the inner space of the outer chamber C1 is rotated to allow the exhaust gas to stay in the outer chamber C1 for a long time, and the desulfurization process can be performed for a relatively long time.

It is preferable that the volume V2 of the inner chamber C2 is larger than the volume V1 of the outer chamber C1 (see Fig. 3, the shaded display area means volume). When the flow rate of the flue gas flowing into the chamber 10 is constant, when the volume is relatively large, a slow flow rate is formed. Since the flue gas flowing into the first flue gas inlet 11 contains a large amount of sulfur, Even if the flue-gas moves at a speed (gas-liquid contact time is short), much sulfur can be removed. However, when the flue gas from which the sulfur is primarily removed in the outer chamber C1 flows into the inner chamber C2 and moves quickly, the removal of the remaining sulfur is not easy. It is therefore preferable to make the volume V2 of the inner chamber C2 larger than the volume V1 of the outer chamber C1 so as to lower the flow rate of the exhaust gas in the inner chamber C2 to sufficiently secure the gas- So that the efficiency of the desulfurization treatment can be improved.

The slurry storage unit 20 may include a slurry supply pipe 21 for supplying a slurry containing an alkaline substance (also referred to as an 'alkaline slurry'), and receives and stores (stores) the alkaline slurry. At this time, the alkaline substance may be, but not limited to, limestone (CaCO ₃ ), calcium hydroxide (Ca (OH) ₂ ), ammonia (NH ₃ ), sodium hydroxide (NaOH) Considering economic efficiency and productivity, it is preferable to use limestone (CaCO ₃ ). The pH of the alkaline slurry stored in the slurry reservoir 20 can be adjusted according to the desulfurization efficiency and the quality of the gypsum to be produced and can preferably be maintained at a pH of 4.5 to 6.0.

The slurry storage part 20 may include an oxygen gas supply pipe 22 for supplying oxygen gas to the inside of the slurry storage part 20 to produce gypsum and may be formed by mixing the alkaline slurry with the alkaline slurry so that the pH of the stored alkaline slurry can be uniformly formed And an agitator 23 may be provided.

The first slurry injecting section 30 and the second slurry injecting section 35 are located in the outer chamber C1 and the inner chamber C2 and are connected to the injection pipes 31 and 32 having the plurality of injection nozzles 32 and 37, 36, and is supplied with the alkaline slurry stored in the slurry storage unit 20 and injected into the exhaust gas to desulfurize the exhaust gas. At this time, in order to improve the efficiency of the desulfurization treatment, the injection pipes 31 and 36 are preferably formed in multiple stages in the vertical direction as shown in FIG. That is, it is preferable that the spray nozzles 32 and 37 are formed in multi-stages so as to spray a large amount of slurry, and it is preferable that the spray directions of the spray nozzles 32 and 37 are not overlapped with each other.

The mist eliminator 40 is located at the upper end of the inner chamber C2 and is capable of removing moisture from the exhaust gas through which the sulfur is removed through the second slurry spraying section 35. [ 5, the mist removing unit 40 includes an upper supporting frame (not shown) fixed to the inner wall of the inner chamber C2, 41 and a lower support frame 42 fixed to the inner wall of the inner chamber C2 and spaced apart from each other and joined to the upper support frame 41 and the lower support frame 42, And may include a plurality of bending plates 43 having a plurality of bending plates. At this time, the bending plate 43 includes a vertex 44 having a vertical plate protruding to one side, a valley 45 having a vertical plate shape protruding to the other side, and upper and lower support frames 41 and 42 The connecting portion 47 and the crest portion 44 and the valley portion 45 are connected in an oblique direction or the crest portion 44 and the connecting portion 47 or the valley portion 45 And a connecting portion 46 having an inclined plate shape for connecting the fastening portions 47 in an oblique direction. The bending plate 43 having such a structure is formed by alternately connecting the vertical plate and the swash plate so that the flue gas is naturally guided to the upper side to smoothly pass therethrough, and the water mist can be blocked or adhered to be collided or adhered. That is, although the flue gas passes through the gap between the bending plates 43, the water (mist) contained in the flue gas collides with the bent portion while flowing into the gap between the bending plates 43, Or adhered to the bending plate 43. The adhered water may fall along the vertical surface of the vertical plate and the downward inclined surface of the vertical plate due to gravity while falling to the lower portion of the desulfurizing device while being adhered to each other.

6, the mist removing unit 40 is disposed above the upper support frame 41 and includes a plurality of spray nozzles 49, and supplies the alkaline slurry from the slurry storing unit 20 And a mist removing pipe 48 for spraying downward to remove the mist attached to the upper supporting frame 41, the lower supporting frame 42 and the bending plate 43. That is, it is possible to remove moisture adhering to the bending plate 43 or the like by spraying an alkaline slurry, and to remove untreated sulfur in the exhaust gas.

In one embodiment, the present invention is characterized in that the alkaline slurry stored in the slurry storage unit 20 is supplied to at least one of the first slurry spraying unit 30, the second slurry spraying unit 35 and the mist removing unit 40 And a slurry feed amount control unit 50 for controlling the amount of feed to any one of them. Particularly, in the case where the injection pipes 31 and 36 of the first slurry injecting unit 30 and the second slurry injecting unit 35 are formed in multiple stages, the mist removal unit 40 is configured to remove the mist In the case where the pipe 48 is provided, the desulfurization efficiency can be improved by controlling the amount of the slurry fed to each pipe. At this time, it is important to adjust the slurry injection amount of the inner chamber C2 in which the exhaust gas forms the upward flow. That is, the outer chamber C1 forms a descending air flow and can sufficiently contact the sprayed slurry, but the inner chamber C2 forms an upward flow of the exhaust gas so that a larger amount of the slurry on the upper side where the concentration of sulfur gradually decreases So that the desulfurization efficiency can be improved. Therefore, when the injection pipe 36 of the second slurry injecting section 35 is formed in multiple stages, the injection pipe 36 installed at the lowest position injects the slurry into the exhaust gas containing a relatively large amount of sulfur components, (Represented by the thinnest line) of the slurry, and the injection pipe 36 installed at the highest position injects the slurry to the exhaust gas containing a relatively small amount of sulfur, .

On the other hand, the slurry to be supplied to the mist removing pipe 48 is mainly intended to remove water adhering to the bending plate 43 and the like, and it is a secondary purpose to remove the remaining sulfur. Therefore, ).

Next, the wet desulfurization method using the above-described wet desulfurization apparatus will be described. In order to explain this, the above-described wet desulfurization apparatus is used, and redundant description will be omitted.

A wet desulfurization method according to an embodiment of the present invention is a wet desulfurization method using the above-described wet desulfurization apparatus, which comprises a first desulfurization step of introducing an exhaust gas containing sulfur (S) into an outer chamber (C1) through an exhaust gas inlet step; A second step of supplying the alkaline slurry stored in the slurry storage unit 20 to the first slurry spraying unit 30; A third step of injecting the alkaline slurry supplied from the first slurry spraying unit 30 into the exhaust gas flowing into the outer chamber C1 through the flue gas inlet 11 and spraying the flue gas forming the downward air stream to remove the sulfur S; A fourth step of supplying the alkaline slurry stored in the slurry storage unit 20 to the second slurry spraying unit 35; A fifth step of spraying the alkaline slurry supplied by the second slurry spraying unit 35 to the flue gas flowing into the inner chamber C2 through the outer chamber C1 and forming an ascending air flow to remove the sulfur S; A sixth step of removing water from the flue gas from which sulfur (S) has been removed by using the mist eliminator (40); And a seventh step of discharging sulfur (S) and dehydrated flue gas.

The present invention improves the desulfurization efficiency by separating the chamber 10 into the inner chamber C2 and the outer chamber C1 by using the partition wall 13 and controlling the moving speed of the exhaust gas and the amount of spray of the alkaline slurry It has the effect of being able to. That is, while the conventional wet desulfurization apparatus is a single upward downward path, the present invention is characterized in that the incoming flue gas forms a down stream and is subjected to a first desulfurization process, followed by a second upward desulfurization process, Can be improved.

The flue gas inlet 11 is formed to be connected to the outer chamber C1 so that the flue gas containing sulfur S flows into the outer chamber C1 through the flue gas inlet 11, Thereby forming a downward flow. At this time, the inner chamber C2 and the outer chamber C1 are formed in a cylindrical shape, and when the exhaust gas flows in the tangential direction of the outer chamber C1, the exhaust gas surrounds the outer surface of the inner chamber C2, The inner space is rotated and lowered and can be desulfurized for a relatively long time.

The second step is a step of supplying the alkaline slurry stored in the slurry storing unit 20 to the first slurry spraying unit 30. At this time, the pH of the alkaline slurry may be 4.5 to 6.0.

The third step is a step of spraying the alkaline slurry supplied by the first slurry spraying part 30 onto the exhaust gas forming the down stream to perform the desulfurization treatment. In order to improve the desulfurization treatment efficiency, the first slurry spraying part 30 includes a plurality of The spraying pipe 31 injects the alkaline slurry supplied from the slurry storing unit 20 using the spraying pipe 31 having the plurality of spraying nozzles 32. The spraying pipe 31 is formed in multiple stages in the vertical direction of the outer chamber C1 . In addition, the moving speed of the exhaust gas forming the downward airflow in the third step may be faster than the moving speed of the exhaust gas forming the upward airflow in the later-described fifth step. The exhaust gas flowing into the outer chamber C1 contains a relatively large amount of sulfur, thereby facilitating the desulfurization treatment.

The fourth step is a step of supplying the alkaline slurry stored in the slurry storing part 20 to the second slurry spraying part 35. [ At this time, the pH of the alkaline slurry may be 4.5 to 6.0.

The fifth step is a step of desulfurizing the alkaline slurry supplied by the second slurry spraying unit 35 by spraying the alkaline slurry supplied to the inner chamber C2 through the outer chamber C1 to the flue gas forming the upward flow, The second slurry spraying unit 35 injects the alkaline slurry supplied from the slurry storage unit 20 by using the spray pipe 36 having the plurality of spray nozzles 37, (36) are formed in multiple stages in the vertical direction of the inner chamber (C2). In order to further improve the efficiency of the desulfurization treatment, it is preferable to transfer the largest amount of slurry to the spray pipe (36) formed at the uppermost position, and control to transfer the smallest amount of slurry to the spray pipe (36) Do. That is, it is possible to improve the desulfurization efficiency by spraying a small amount of slurry into a relatively high sulfur gas and spraying a large amount of slurry into a relatively small sulfur gas.

It is preferable that the moving speed of the flue gas forming the ascending air stream in the fifth step is slower than the moving speed of the flue gas forming the descending air stream in the third step. Since the flue gas passing through the inner chamber C2 is subjected to the first desulfurization treatment and most of the sulfur is removed, it is not easy to remove the remaining sulfur when the desulfurization treatment is performed under the same conditions as the outer chamber C1. Therefore, it is preferable to increase the volume V2 of the inner chamber C2 to be larger than the volume V1 of the outer chamber C1 to slow the moving speed of the exhaust gas and increase the gas-liquid contact time, thereby improving the desulfurization treatment efficiency.

The sixth step is to remove the moisture of the flue gas from which the sulfur has been removed by using the mist removing unit 40. The upper supporting frame 41, the lower supporting frame 42 and the bending plate 43 are disposed, The water in the flue gas is removed by adhering moisture to the bending plate 43 or the like.

The seventh step is a step of discharging the desulfurized exhaust gas, and the exhausted exhaust gas may be transferred to a subsequent treatment facility (such as an electric dust collector).

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

10: chamber
11: Flue gas inlet
12: Exhaust gas outlet
13:
20: Slurry storage part
21: Slurry feeder
22: oxygen gas supply pipe
23: stirrer
30: First slurry spraying part
31: injection pipe
32: injection nozzle
35: Second slurry spraying part
36: injection pipe
37: injection nozzle
40: mist removal
41: upper support frame
42: Lower support frame
43: bending plate
44:
45: valley
46:
47:
48: Mist removal pipe
49: injection nozzle
50: slurry feed amount control section
C1: outer chamber
C2: Inner chamber
V1: volume of the outer chamber
V2: volume of the inner chamber

Claims (23)

A partition wall is provided and is divided into an inner chamber and an outer chamber, and an exhaust gas inlet is provided to allow the exhaust gas containing sulfur (S) to flow into the outer chamber. The exhaust gas is exhausted through the inner chamber, A chamber having an outlet;
A slurry storage unit disposed in the lower portion of the chamber for storing and storing the alkaline slurry;
A first slurry spraying unit located in the outer chamber for spraying the alkaline slurry stored in the slurry storage unit to the exhaust gas;
A second slurry spraying unit located in the inner chamber and supplied with the alkaline slurry stored in the slurry storage unit and spraying onto the exhaust gas;
And a mist removing unit located at an upper end of the inner chamber and removing moisture of the exhaust gas passing through the second slurry spraying unit and having sulfur removed therefrom,
Wherein the flue gas containing sulfur is introduced into the flue gas inlet, sequentially passed through the outer chamber and the inner chamber, and then discharged to the flue gas outlet. The method according to claim 1,
Wherein the volume of the inner chamber is greater than the volume of the outer chamber. The slurry reservoir according to claim 1,
And a slurry supply line for supplying an alkaline slurry. The slurry reservoir according to claim 1,
And an oxygen gas supply pipe for supplying oxygen gas. The slurry reservoir according to claim 1,
And a stirrer for stirring the stored alkaline slurry. The apparatus according to claim 1, wherein the first slurry jetting section comprises:
And a spray pipe having a plurality of spray nozzles for spraying the alkaline slurry supplied from the slurry reservoir. 7. The injection apparatus according to claim 6,
And is multi-tiered in the vertical direction of the outer chamber. The apparatus according to claim 1, wherein the second slurry jetting section comprises:
And a spray pipe having a plurality of spray nozzles for spraying the alkaline slurry supplied from the slurry reservoir. 9. The injection apparatus according to claim 8,
Is formed in multiple stages in the vertical direction of the inner chamber. The mist eliminator according to claim 1,
An upper support frame fixed to the inner wall of the inner chamber,
A lower support frame fixed to the inner wall of the inner chamber and
And a plurality of flexure plates coupled to the upper support frame and the lower support frame in spaced apart relation and having a plurality of flexures. 11. The bending plate according to claim 10,
An oblique plate-like crest portion protruding to one side,
A valley of a vertical plate shape protruding to the other side,
A fastening portion formed in the upper end portion and the lower end portion, respectively, and fastened to the upper support frame and the lower support frame,
And a connecting portion having an inclined plate shape connecting the mountain portion and the valley portion in diagonal directions or connecting the mountain portion and the coupling portion or the valley portion and the coupling portion in the diagonal direction. The mist eliminator according to claim 10,
A mist removing pipe disposed above the upper support frame and provided with a plurality of spray nozzles for spraying the alkaline slurry from the slurry storage portion and spraying downward to remove mist from the upper support frame, the lower support frame, and the bend plate; Wherein the wet desulfurization apparatus comprises: The method according to claim 1,
And a slurry feed amount control unit for controlling an amount of feeding the alkaline slurry stored in the slurry storage unit to at least one of the first slurry spraying unit, the second slurry spraying unit and the mist removing unit. 14. The apparatus according to claim 13, wherein the second slurry jetting portion comprises:
And a spray pipe having a plurality of spray nozzles for spraying the alkaline slurry supplied from the slurry reservoir. 15. The injection apparatus according to claim 14,
Is formed in multiple stages in the vertical direction of the inner chamber. The slurry transferring apparatus according to claim 15,
Wherein the control unit controls to transfer the greatest amount of slurry to the most sprayed pipe and transfer the least amount of slurry to the sprayed pipe formed at the bottom. 14. The mist eliminator according to claim 13,
An upper support frame fixed to the inner wall of the inner chamber,
A lower support frame fixed to the inner wall of the inner chamber and
And a plurality of flexure plates coupled to the upper support frame and the lower support frame in spaced apart relation and having a plurality of flexures. 18. The bending plate according to claim 17,
An oblique plate-like crest portion protruding to one side,
A valley of a vertical plate shape protruding to the other side,
A fastening portion formed in the upper end portion and the lower end portion, respectively, and fastened to the upper support frame and the lower support frame,
And a connecting portion having an inclined plate shape connecting the mountain portion and the valley portion in diagonal directions or connecting the mountain portion and the coupling portion or the valley portion and the coupling portion in the diagonal direction. 18. The mist eliminator according to claim 17,
A mist removing pipe disposed above the upper support frame and provided with a plurality of spray nozzles for spraying the alkaline slurry from the slurry storage portion and spraying downward to remove mist from the upper support frame, the lower support frame, and the bend plate; Wherein the wet desulfurization apparatus comprises: A wet desulfurization method for removing sulfur (S) in an exhaust gas using the wet desulfurization apparatus of claim 1,
A first step of introducing an exhaust gas containing sulfur (S) into the outer chamber through an exhaust gas inlet;
A second step of supplying the alkaline slurry stored in the slurry storage unit to the first slurry spraying unit;
A third step of injecting the alkaline slurry supplied from the first slurry spraying unit into the outer chamber through the flue gas inlet and spraying the flue gas forming the downward air stream to remove the sulfur S;
A fourth step of supplying the alkaline slurry stored in the slurry storage unit to the second slurry spraying unit;
A fifth step of injecting the alkaline slurry supplied to the second slurry spraying unit into the inner chamber through the outer chamber, and injecting the alkaline slurry into the flue gas forming the ascending air stream to remove the sulfur S;
A sixth step of removing water from the flue gas from which sulfur (S) has been removed by using a mist removing unit; And
And a seventh step of discharging sulfur (S) and dehydrated flue gas. 21. The method of claim 20,
Wherein the moving speed of the flue gas forming the downward airflow in the third step is higher than the moving speed of the flue gas forming the upflow air in the fifth step. 21. The method according to claim 20, wherein the second slurry jetting portion of the fifth step comprises:
Characterized in that it comprises a plurality of spray nozzles and spraying an alkaline slurry supplied from the slurry storage part, and a spray pipe formed in multiple stages in the vertical direction of the inner chamber. 23. The method of claim 22,
Characterized in that the maximum amount of slurry is transferred to the most sprayed pipe and the least amount of slurry is transferred to the sprayed pipe formed at the bottom.

Images