JP2003135930A - Stack gas desulfurization apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stack gas desulfurization apparatus for removing sulfur oxides (SOx) in exhaust gas in high efficiency over a long period of time and a method for regenerating a catalyst used in the stack gas desulfurization apparatus. SOLUTION: This stack gas desulfurization apparatus is provided with a catalyst tank 14 which is disposed in a column 12 in the apparatus where the exhaust gas 100 containing SOx is made to pass and is formed by an activated carbon fiber layer, a water supplying means 33 disposed in the column 12 for supplying addition water for producing sulfuric acid or washing water to the tank 14 and a heating means 45 disposed in the column 12 for heating the tank 14 in an inert gas atmosphere 46.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to sulfur oxides (SOx) in exhaust gas discharged from boilers, gas turbines, engines, incinerators, etc. that burn fuels such as coal and heavy oil over a long period of time. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue gas treatment device for highly efficient removal and a catalyst regeneration treatment method for a flue gas desulfurization device.

[0002]

BACKGROUND ART Conventionally, as a method for removing sulfur oxides in exhaust gas, a lime-gypsum method has been adopted in which limestone or slaked lime slurry is used as an absorbent and the sulfur content in the exhaust gas is recovered as gypsum. As another method, a dry method of adsorption with activated carbon is known.

In the above-mentioned conventional lime-gypsum method, limestone or slaked lime slurry is sprayed into the exhaust gas to simultaneously perform humidification cooling of the exhaust gas and absorption of SOx. Therefore, it is necessary to circulate a large amount of slurry, and power and a large amount of water for circulating the slurry are required. Further, since the generated gypsum is in a slurry state, a device for separating water and collecting it as gypsum is required. As described above, in the lime-gypsum method, it is inevitable that the desulfurization equipment becomes large and complicated.

On the other hand, in the dry method, a large amount of heat is required because the sulfur content adsorbed on the activated carbon is desorbed by heating. Moreover, in the case of this method, disposal of the generated dilute sulfuric acid, wear of the adsorbent, and the like pose problems. Therefore, an object of the present invention is to provide a desulfurization apparatus which does not require a sulfur oxide absorbent or a large-scale desulfurization facility and can obtain a high concentration of sulfuric acid during desulfurization.

Therefore, as a device for removing SOx in exhaust gas, SOx in exhaust gas is adsorbed on a porous carbon material such as activated carbon fiber, and oxygen contained in the exhaust gas is utilized by utilizing the catalytic action of the porous carbon material. To oxidize the sulfur component,
It has been proposed to absorb this in water and remove it as sulfuric acid from the porous carbon material (JP-A-11-3473).
No. 50).

In a conventional flue gas treatment apparatus using this activated carbon fiber, an activated carbon fiber tank for adsorbing SOx in the exhaust gas is arranged in the adsorption tower, and the exhaust gas is supplied from below to activate the activated carbon fiber. SO ₂ is oxidized to SO ₃ on the surface of SO ₃ , and the generated SO ₃ reacts with the supplied water to generate sulfuric acid (H ₂ S
O ₄ ) is generated.

When desulfurization of flue gas using the above-mentioned activated carbon fiber is carried out for a long period of time, there is a problem that the active points of the activated carbon fiber gradually disappear and the desulfurization performance deteriorates.

In view of the above problems, the present invention provides a flue gas treatment apparatus for removing sulfur oxide (SOx) in exhaust gas with high efficiency over a long period of time, and a catalyst regeneration treatment method for a flue gas desulfurization apparatus. The challenge is to provide.

[0009]

A first invention for solving the above-mentioned problems is to provide a catalyst tank which is provided in an apparatus tower through which exhaust gas containing sulfur oxide flows and which is formed of an activated carbon fiber layer, Water supply means provided in the apparatus tower, for supplying additive water for sulfuric acid generation or cleaning water for washing to the catalyst tank, and provided inside or outside the apparatus tower, and the catalyst tank is inactive A flue gas desulfurization apparatus comprising a heating means for heating in a gas atmosphere.

A second aspect of the present invention is the flue gas desulfurization apparatus according to the first aspect, wherein the heating temperature for heating the catalyst tank is 800 ° C. or lower.

A third aspect of the invention is the activated carbon fiber layer forming one unit of the catalyst tank according to the first or second aspect,
A flat plate-like activated carbon fiber sheet and a corrugated plate-like activated carbon fiber sheet are alternately laminated, and a passage is formed with a linear space formed therebetween extending vertically. It is a characteristic flue gas treatment device.

A fourth aspect of the present invention is the fuel cell system according to any one of the first to third aspects, wherein an inlet for the exhaust gas containing sulfur oxide is provided in a lower portion of the apparatus tower, and an outlet for the purified exhaust gas is provided in an upper portion. In addition to the above, a flue gas treatment apparatus is characterized in that it is provided with a supply device of added water or washing water above the catalyst tank provided in the tower.

A fifth invention is a flue gas desulfurization apparatus according to any one of the first to fourth aspects, and a gypsum reaction tank for reacting dilute sulfuric acid from the flue gas desulfurization apparatus with lime slurry to obtain gypsum slurry, A flue gas desulfurization system comprising: a dehydrator for separating gypsum from the gypsum slurry obtained in the gypsum reaction tank to obtain gypsum.

A sixth aspect of the present invention is a flue gas desulfurization system comprising a flue gas desulfurization apparatus according to any one of the first to fourth aspects and a concentration tank for concentrating the dilute sulfuric acid obtained by the desulfurization apparatus. It is in.

A seventh aspect of the present invention is the fuel cell system according to the fifth or sixth aspect, wherein the exhaust gas is a gas discharged from a boiler, a gas turbine, an engine and various incinerators, and is provided with a soot / dust removing means for removing soot / dust in the exhaust gas. The flue gas desulfurization system is characterized by the following.

An eighth aspect of the invention is to use the first flue gas desulfurization apparatus to determine the presence or absence of the processing capacity of the catalyst tank, and as a result of the determination, if the processing capacity is determined, the catalyst is used. A method for regenerating a catalyst in a flue gas desulfurization apparatus, which comprises a step of continuously using the tank as it is and a step of regenerating the catalyst tank by a heating means when it is determined that the processing capacity is not available. is there.

A ninth aspect of the present invention uses a flue gas desulfurization apparatus having a catalyst tank formed of an activated carbon fiber layer, and a judging step for judging whether or not the processing capacity of the catalyst tank is present. If it is determined that the catalyst tank is continuously used as it is, and if it is determined that there is no processing capacity, the catalyst in the catalyst tank is heat-treated at a high temperature of 800 ° C. or higher. A method of regenerating a catalyst in a flue gas desulfurization apparatus, which is characterized in that

According to a tenth aspect of the present invention, after performing desulfurization treatment using the first flue gas desulfurization apparatus, a first determination step of determining whether or not the processing capacity of the catalyst tank is present, and the result of the first determination, When it is determined that the treatment capacity is available, the step of continuing the desulfurization treatment is continued, and when it is determined that the treatment capacity is not present as a result of the first determination, the catalyst tank whose treatment capacity is lowered is heated by the heating means. Whether or not the catalyst tank has a treatment capacity after the step of regenerating, the step of continuing the desulfurization treatment using the catalyst tank after the regeneration treatment, and the desulfurization treatment using the catalyst tank after the regeneration treatment. A second determination step of determining
As a result of the judgment, if it is judged that the treatment capacity is available, the step of continuing the desulfurization treatment is continued. If, as a result of the second judgment, it is judged that there is no treatment capacity, the catalyst is kept at a high temperature of about 800 ° C. A catalyst regeneration treatment method for a flue gas desulfurization apparatus, comprising: a high temperature heat treatment step of heat treatment; and a step of forming a catalyst tank by using the catalytically active carbon fibers remaining by high temperature heating as a catalyst.

An eleventh aspect of the invention is the fuel cell system according to the eighth aspect, wherein the temperature at which the catalyst is regenerated by the heating means is 800 ° C.
A method for regenerating a catalyst in a flue gas desulfurization device is characterized in that

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a flue gas treatment apparatus according to the present invention will be described below, but the present invention is not limited to these embodiments.

[First Embodiment] FIG. 1 is a schematic view of a flue gas treatment apparatus according to the present embodiment. FIG. 2 is a perspective view of the activated carbon fiber layer. As shown in FIG. 1, the flue gas treatment apparatus has an inlet 1 for an exhaust gas 100 containing a harmful substance.
1 is provided on the side wall (or lower part) of a desulfurization tower 12 which is an apparatus tower, has an exhaust port 13 of the exhaust gas 100 at the top, and a catalyst tank 14 made of an activated carbon fiber layer is provided in the desulfurization tower 12. There is. Further, in the desulfurization tower 12, there is provided a water spray nozzle 33 for spraying the additive water 31 from the upper end side of each catalyst tank 14 from the additive water tank 30 via a pump 32 provided in a water supply line 34. . In addition, the added water 31
The cleaning liquid tank 35 is connected to the water supply line 34 of the cleaning liquid 3
6 is supplied, and the catalyst is washed by spraying water from the spray nozzle 33. When desulfurizing using the desulfurization tower 12, the exhaust gas 100 is pushed into the tower 12 and the fan 1
By feeding 01, the exhaust gas 100 comes into contact with the activated carbon fiber layer of the catalyst tank 14, and the sulfur oxide (SOx) in the exhaust gas 100 is removed. As shown in FIG. 1, a line for discharging the purified purified exhaust gas 15 discharged from the desulfurization tower 12 is provided with a mist eliminator 16 as necessary, and after separating water in the exhaust gas,
It may be discharged from the chimney 17 to the outside.

As shown in FIG. 2, the activated carbon fiber layer 20 forming one unit of the catalyst layer 14 is composed of a flat plate-shaped activated carbon fiber sheet 21 and a corrugated corrugated plate activated carbon fiber sheet 22. The passages 23 are formed in a state where they are alternately stacked and the linear spaces formed between them are vertically extended.

The flat plate activated carbon fiber sheet 21 and the corrugated plate activated carbon fiber sheet 22 are plate-shaped, and the corrugated plate activated carbon fiber sheet 22 is corrugated by, for example, a corrugator.
Further, it may be formed into a honeycomb shape.

To form the activated carbon fiber layer 20, the flat activated carbon fiber sheet 21 and the corrugated activated carbon fiber sheet 2 are used.
2 are alternately laminated, and the peaks of the corrugated activated carbon fiber sheet 22 and the flat activated carbon fiber sheet 21 are joined by fusion bonding of the binder to form a pack having a predetermined size. Since the corrugated sheet activated carbon fiber sheet 22 and the flat sheet activated carbon fiber sheet 21 are joined by fusion bonding of the binder, an adhesive such as an organic substance is not used. For this reason, the adhesive does not affect the desulfurization reaction, and the reliability of the bonding is improved, and the influence on the pressure loss can be eliminated.

Further, in the present embodiment, as shown in FIG. 2, the pitch p between the flat activated carbon fiber sheets 21 is set.
Is 1 to 10 mm (preferably 3 to 6 mm), and the width of the crests of the corrugated plate activated carbon fiber sheet is 1 to 15 mm (preferably 9 to 10 mm). As an example, the pitch p of the corrugated plate activated carbon fiber sheet 22 is set to about 4 mm, and the width h of the peak portion of the corrugated plate activated carbon fiber sheet 22 is 1
It is set to about 0 mm. Therefore, the contact area between the harmful substance in the exhaust gas and the activated carbon fiber and the number of times of contact increase, and the efficiency of removing the harmful substance improves.

The catalyst tank 14 is arranged in the desulfurization tower as follows. First, the passage 23 is formed in the frame (not shown).
Are filled with a plurality of activated carbon fiber layers 20 so that the vertical axis is in the vertical axis direction to form a catalyst tank (for example, a height of 0.5 m to 4 m) 14 and the catalyst tank is provided in the desulfurization tower 12 such as a crane. It is designed to be installed by lifting means.

The catalyst tank 14 has a plurality of stages (for example, 3 to 5).
You may make it laminate | stack with a step. As a result, the contact space between the activated carbon fiber of the activated carbon fiber layer and the harmful substance is formed long in the vertical axis direction, and the decomposition and removal efficiency is improved.

Here, the exhaust gas is emitted from various incinerators such as a municipal waste incinerator, an industrial waste incinerator, a sludge incinerator, a melting furnace, a boiler, a gas turbine, an engine, etc. In the invention, sulfur oxide (SOx: S
O, SO ₂ , SO ₃ , S ₂ O _{3 and the} like), the source of generation is not particularly limited.

Here, an example of the activated carbon fiber used in the present invention and an example of its production will be shown below. Examples of the activated carbon fiber used in the present invention include pitch-based activated carbon fiber, polyacrylonitrile-based activated carbon fiber, phenol-based activated carbon fiber, and cellulose-based activated carbon fiber, but the present invention is not limited thereto. However, the activated carbon fiber is not limited as long as it is an activated carbon fiber having the above-mentioned catalytic action.

Here, the activated carbon fiber of the present invention is from 800 to
Heat treatment is performed in the range of 1200 ° C. This is because the functional groups on the surface are removed by heat treatment (de-CO, de-CO ₂ ),
This is because the amount of active sites that are SO ₂ oxidation sites in the activated carbon fiber layer is increased to make the active sites effective and to make the surface hydrophobic. This hydrophobic property improves the efficiency of sulfuric acid discharge. Therefore, the activated carbon fibers used in the flue gas treatment apparatus of the present invention are preferably heat-treated activated carbon fibers.

The catalyst tank 14 is provided with a catalyst composed of a plurality of activated carbon fiber layers as described above, and the desulfurization reaction occurs on the surface of each activated carbon fiber layer, for example, by the following reaction. That is, (1) Sulfur dioxide S in the exhaust gas to the activated carbon fiber layer of the catalyst
Adsorption of O ₂ . (2) Adsorbed sulfur dioxide SO ₂ and oxygen O in exhaust gas
Oxidation to sulfur trioxide SO ₃ by reaction with ₂ (can be supplied separately). (3) Generation of sulfuric acid H ₂ SO ₄ by dissolving oxidized sulfur trioxide SO ₃ in water H ₂ O. (4) Desorption of the generated sulfuric acid H ₂ SO _{4 from} the activated carbon fiber layer.

The reaction formula at this time is as follows. SO ₂ + 1 / 2O ₂ + H ₂ O → H ₂ SO ₄

[0033] The reaction removed sulfuric acid (H ₂ SO ₄₎ is within the catalyst chamber 14 was added dropwise a diluted sulfuric acid, is accumulated at the bottom sump dilute sulfuric acid 41 of the desulfurization tower 12. When a predetermined amount (or always) of the dilute sulfuric acid stored in the dilute sulfuric acid reservoir 41 is reached, it is discharged to the sulfuric acid tank 43 via the discharge pump 42.

The dilute sulfuric acid (H ₂ SO ₄ ) produced was used.
Is discharged to the outside and concentrated to form sulfuric acid, or lime slurry is supplied to obtain gypsum, as shown in an embodiment described later.

When stopping the desulfurization reaction, ventilation of the exhaust gas flowing into the apparatus is stopped, and then the catalyst tank 14 is washed with the washing liquid 36.

Here, when the desulfurization efficiency of the apparatus is lowered, the cleaning liquid 36 from the cleaning liquid tank 35 introduced into the water supply line 34 is supplied from the water spray nozzle 33 to the catalyst tank 1.
The surface of the activated carbon fiber layer constituting 4 is washed. This washing is particularly suitable for catalyst deterioration due to physical action due to adhesion of dust and the like on the surface of the activated carbon fiber. As a means for determining the decrease in desulfurization, a measuring device such as an SO ₂ meter may be used while confirming the decrease in desulfurization efficiency.

Alternatively, the entire catalyst layer 14 may be taken out from the desulfurization tower 12 and immersed in a washing tank or the like to be washed outside. At this time, if the ultrasonic cleaning means is also used, the cleaning efficiency is further improved.

If the removal of soot and dust by this cleaning is not sufficient, the heating and regenerating means 45 for covering the catalyst tank 14 shown in FIG. 1 may be used to heat and regenerate the entire catalyst tank 14. At this time, an inert gas (for example, CO ₂ , N
₂ etc.) 46 may be introduced to recover the catalyst performance. The temperature of this regeneration is a temperature at which the binder constituting the activated carbon fiber fiber sheet of the activated carbon fiber layer 20 does not disappear by heating (about 800 ° C. or less, preferably 500 ° C.).
(Before and after) is preferable. In addition, an inlet and an outlet of the exhaust gas 100 are provided on the lower surface and the upper surface of the heating and regenerating unit 45, respectively.

By this heating regeneration, as shown in FIG.
The active groups (-C = O, -C-OH, etc.) on the surface of the activated carbon fiber 110 generated by the catalytic reaction are removed, and the active sites 111
To regenerate surface activity.

For this heat regeneration, the heat regeneration means 45 provided inside the desulfurization tower as in this embodiment may be provided outside. It is preferable to provide the heating and regenerating unit 45 outside because the device structure of the desulfurization tower can be simplified. This regeneration is particularly suitable for chemical catalyst deterioration on the surface of the activated carbon fiber on which the functional group is formed.

When the above heating regeneration is insufficient, the catalyst layer 14 is taken out of the desulfurization tower 12 and subjected to a heat treatment at a high temperature in an oxygen atmosphere to carry out an organic matter such as unburned coal or a binder adhered to the surface of the activated carbon fiber. Should be carbonized and eliminated, leaving only the activated carbon fibers. This heat treatment temperature is at least 800 ° C., which is the disappearance temperature of the binder, and preferably 1000 ° C. or more.

In the case where such a regeneration treatment is continuously performed, at least two desulfurization devices are provided and used alternately so that desulfurization is performed by the other desulfurization device which has been regenerated during the regeneration. You can do this.

Next, referring to FIG. 4, a preferred example of one step of the regeneration process when the catalyst is deteriorated will be described, but the present invention is not limited to this.

When performing desulfurization, the catalyst capacity is judged (S-101). As a result of this determination, when it is determined that the catalyst has the ability, the use of the catalyst is continued as it is (S-102). On the other hand, as a result of the determination, when it is determined that the catalytic ability is not available, the cleaning process is performed (S-103).

Subsequently, the desulfurization treatment is continued and the catalyst ability is judged (S-104). As a result of this determination, when it is determined that the catalyst has the ability, the use of the catalyst is continued as it is (S-102). On the other hand, as a result of the determination, when it is determined that the catalyst has no ability, the heating treatment (heating temperature: 500 ° C.) is performed by the heating regeneration means 45 shown in FIG.

Subsequently, the desulfurization treatment is continued and the catalyst ability is judged (S-106). As a result of this determination, when it is determined that the catalyst has the ability, the use of the catalyst is continued as it is (S-102). On the other hand, as a result of the determination, when it is determined that the catalyst has no ability, the catalyst tank 13 is taken out, and the catalyst is reused by heating at a high temperature (1000 ° C.) in an oxygen atmosphere (S-107). Organic matter disappears by the above high-temperature heating, and only activated carbon fiber is obtained (S-1
08). Using the obtained activated carbon fiber, catalyst molding is performed again (S-109). The catalyst tank obtained by catalyst regeneration is installed in the desulfurization tower 12 (S-110).

By this series of steps, when the catalyst capacity in the desulfurizer is lowered, the desulfurization efficiency can be maintained for a long period of time by regenerating by a proper means.

[Second Embodiment] Next, referring to FIG. 4, the exhaust gas containing sulfur oxides from the boiler is subjected to flue gas treatment,
A system for obtaining plaster will be described. As shown in FIG. 4, a boiler 1 that generates steam that drives a steam turbine, a dust remover 2 that removes soot dust in the exhaust gas 100 from the boiler 1, and a dust-free exhaust gas are supplied into the desulfurization tower 12. Push-in fan 101 and exhaust gas 10 before being fed into the equipment tower
A humidification cooling device 102 for cooling 0 and increasing the humidity;
A heating / regenerating means 45 having the catalyst tank 14 therein is provided,
A desulfurization tower in which exhaust gas 100 is supplied from an inlet 11 on the side wall of the lower part of the tower, and water is supplied from a water spray nozzle 33 from above the catalyst tank 14 to cause a desulfurization reaction of SOx in the exhaust gas to dilute sulfuric acid (H ₂ SO ₄ ). 12, a chimney 17 for discharging the purified exhaust gas 15 desulfurized and purified from the outlet 13 at the top of the tower, and a dilute sulfuric acid (H ₂ SO ₄ ) from the desulfurization tower 12 via the discharge pump 42, and Separation / removal processing means 37 for further separating / removing soot dust and harmful substances removed in dilute sulfuric acid, and a gypsum reaction tank 52 for supplying lime slurry 51 to purified dilute sulfuric acid to deposit gypsum.
A settling tank (thickener) 53 for settling gypsum, a dehydrator 56 for removing water from the gypsum slurry 54 as drainage (filtrate) 57 to obtain gypsum 55, and a cleaning liquid 36 for a line for supplying the added water 31. A cleaning liquid tank 35 for supplying and spraying the cleaning liquid 36 from the water spray nozzle 33 to clean the catalyst tank 14.

According to this system, when the desulfurization efficiency is lowered, the catalyst can be cleaned with the cleaning liquid 36 from the cleaning liquid tank 35, and the entire catalyst tank 14 is heated and regenerated in the atmosphere of the inert gas 46. As a result, the number of active points on the activated carbon fiber surface can be increased. As a result, the desulfurization efficiency is continuously maintained, so that the removal efficiency of sulfur oxides in the exhaust gas is maintained over a long period of time, and high-quality gypsum can be stably obtained.

[0050]

As described above, according to the present invention, a catalyst tank formed of an activated carbon fiber layer is provided inside an apparatus tower through which exhaust gas containing sulfur oxide flows, and the above apparatus tower. And a water supply means for supplying the additive water for producing sulfuric acid or the washing water for washing to the catalyst tank, and the catalyst tank provided inside or outside the apparatus tower, under an inert gas atmosphere. Since it is provided with a heating means for heating at 1, the catalyst activity can be improved by heating regeneration when desulfurization efficiency is lowered.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a flue gas treatment apparatus according to a first embodiment.

FIG. 2 is a perspective view of an activated carbon fiber layer according to the present embodiment.

FIG. 3 is a diagram showing an increase in active sites due to heat treatment of activated carbon fibers.

FIG. 4 is a flow chart of a regeneration process when the catalyst is deteriorated.

FIG. 5 is a schematic diagram of an exhaust gas treatment system (gypsum production) including a flue gas treatment apparatus according to a second embodiment.

[Explanation of symbols]

1 boiler 100 exhaust gas 101 Push-in fan 11 entrance 12 Equipment tower 13 outlet 14 catalyst tank 15 Purified exhaust gas 17 chimney 31 additional water 33 Watering nozzle 36 cleaning liquid 41 Sulfuric acid reservoir 45 Heating regeneration means 46 Inert gas

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Kurisaki             1-1 Satinoura Town, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries             Nagasaki Shipyard Co., Ltd. (72) Inventor Keiko Kobayashi             2-5-3 Marunouchi, Chiyoda-ku, Tokyo             Hishi Heavy Industries Ltd. F-term (reference) 4D048 AA02 AB01 BA05X BB03                       BB08 BD01 CA03 CD02 CD03                 4G076 AA14 AB06 AB18 BA11 BA43

Claims (11)

[Claims] 1. A catalyst tank provided with an activated carbon fiber layer in an apparatus tower through which exhaust gas containing sulfur oxides flows, and a catalyst tank provided in the apparatus tower for producing sulfuric acid. Water supply means for supplying added water or washing water for washing, and a heating means provided inside or outside the apparatus tower for heating the catalyst tank under an inert gas atmosphere, are provided. Characteristic flue gas desulfurization equipment. 2. The flue gas desulfurization device according to claim 1, wherein the heating temperature for heating the catalyst tank is 800 ° C. or lower. 3. The activated carbon fiber layer forming one unit of the catalyst tank according to claim 1 or 2, wherein a flat plate-shaped flat carbon fiber sheet and a corrugated corrugated plate activated carbon fiber sheet are alternately formed. A flue gas treatment apparatus, characterized in that a passage is formed in a state in which a linear space formed between layers is extended vertically. 4. The tower according to any one of claims 1 to 3, wherein an inlet for the exhaust gas containing sulfur oxide is provided in a lower portion of the apparatus tower, an outlet for the purified exhaust gas is provided in an upper portion, and the tower is provided. A flue gas treatment device comprising a feeder for added water or washing water above a catalyst tank provided inside. 5. The flue gas desulfurization apparatus according to any one of claims 1 to 4, a gypsum reaction tank for reacting dilute sulfuric acid from the flue gas desulfurization apparatus with lime slurry to obtain gypsum slurry, and the gypsum reaction A flue gas desulfurization system, comprising: a dehydrator for separating water from gypsum slurry obtained in a tank to obtain gypsum. 6. A flue gas desulfurization system comprising: the flue gas desulfurization device according to claim 1; and a concentration tank for concentrating the dilute sulfuric acid obtained by the desulfurization device. 7. The method according to claim 5 or 6, wherein the exhaust gas is gas discharged from a boiler, a gas turbine, an engine and various incinerators, and a soot removing means for removing soot and dust in the exhaust gas is provided. Flue gas desulfurization system. 8. A step of determining whether or not the catalyst tank has a processing capacity by using the flue gas desulfurization apparatus of claim 1, and when the determination result shows that the processing capacity is available, the catalyst tank is left as it is. A method of regenerating a catalyst in a flue gas desulfurization apparatus, comprising: a step of continuously using the catalyst; and a step of regenerating a catalyst in a catalyst tank by heating means when it is determined that the catalyst has no treatment capacity. 9. A judgment step of judging whether or not the processing capacity of the catalyst tank is present using a flue gas desulfurization apparatus having a catalyst tank formed of an activated carbon fiber layer, and as a result of the judgment, it is judged that there is processing capacity. In this case, the process of continuously using the catalyst tank as it is, and when it is judged that there is no processing capacity, the catalyst in the catalyst tank is set to 8
And a high-temperature heat treatment step of heat treatment at a high temperature of 00 ° C. or higher. 10. A first determination step of determining whether or not the catalyst tank has processing capacity after performing desulfurization processing using the flue gas desulfurization apparatus of claim 1, and the processing capacity is determined as a result of the first determination. If it is determined that there is a step of continuing the desulfurization treatment as it is, and as a result of the first determination, if it is determined that there is no treatment capacity, the catalyst tank whose treatment capacity has decreased is subjected to catalyst regeneration treatment by the heating means. And a step of continuing desulfurization treatment using the regenerated catalyst tank, and determining whether or not the catalyst tank has a treatment capacity after continuously performing desulfurization treatment using the regenerated catalyst tank. As a result of the second determination step and the second determination, if it is determined that there is processing capability,
As a result of the step of continuing the desulfurization treatment as it is and the result of the second judgment,
A flue gas desulfurization apparatus comprising: a high-temperature heat treatment step of heat-treating a catalyst at a high temperature of about 800 ° C. or higher; and a step of forming a catalyst tank using the catalytically active carbon fiber remaining after high-temperature heating as a catalyst. Catalyst regeneration treatment method. 11. The temperature according to claim 8, wherein the catalyst is regenerated by heating the catalyst tank at a temperature of 800.
A method for regenerating a catalyst in a flue gas desulfurization apparatus, characterized in that the temperature is lower than ℃.