JP5774758B1 - Exhaust gas treatment filler and exhaust gas treatment apparatus filled with the filler - Google Patents

Abstract

An object of the present invention is to provide a low cost and low charge loss loss of exhaust gas without reducing gas-liquid contact efficiency with the exhaust gas treatment liquid. SOLUTION: The pressure loss of exhaust gas flow is greatly reduced by providing a plurality of windows 2 having a hole diameter of 1/3 to 1/3 of the diameter of the cylindrical body on the cylindrical wall of the thin cylindrical body 1. The exhaust gas treatment efficiency is remarkably improved, and since the wall surface area of the thin cylindrical body 1 is reduced by forming the window 2, the adhesion of scaling is reduced, the maintainability is improved, and the structure is simple. In addition, a large number of exhaust gas treatment packings having the above-described configuration are filled in the rotary processing device of the gas horizontal flow type, so that the exhaust gas pressure loss is significantly reduced and the exhaust gas is discharged. Filler for exhaust gas treatment that can improve smoke treatment efficiency. [Selection] Figure 1

Description

  The present invention is a packing for efficiently promoting gas-liquid contact used in flue gas desulfurization or carbon dioxide recovery equipment for removing sulfurous acid gas discharged from factories, power plants, garbage incinerators, etc. And an exhaust gas treatment apparatus filled with the filler.

  As a means for removing substances that become air pollution sources from exhaust gas containing sulfurous acid gas or the like discharged from factories or power plants in recent years or combustion exhaust gas, for example, desulfurization by bringing an absorbing solution into contact with the gas introduction unit and the introduced exhaust gas A final flue gas desulfurization device having a wet electric dust collection unit and an exhaust gas cooling unit for removing the dust in the exhaust gas on the downstream side of the above-mentioned final desulfurization unit with the final desulfurization unit to be used A known exhaust gas treatment system is known (Japanese Patent Laid-Open No. 2011-177664).

  Further, in the flue gas desulfurization apparatus comprising a spray header having a plurality of spray nozzles for spraying an absorbing liquid to the exhaust gas, and an absorption tower provided with a mist eliminator on the downstream side to absorb and remove sulfur oxides in the exhaust gas. There is also a wet-type flue gas desulfurization device provided with a dust removal spray header having a plurality of two-fluid spray nozzles sprayed countercurrently to the exhaust gas flow in the form of fine droplets smaller than the spray nozzle of the spray header between the mist eliminator and the mist eliminator Known (Japanese Patent Laid-Open No. 2013-6125).

  Further, a gas cooler using a refrigerant in the absorption tower, a refrigerant flow rate adjusting valve for adjusting the flow rate of the refrigerant supplied to the gas cooler, a thermometer for measuring the temperature of the gas to be processed passing through the gas cooler, and a measured value of the thermometer Wet flue gas desulfurization apparatus comprising: a control unit that adjusts a refrigerant flow rate based on a measured value; and a means for cooling the gas to be processed by the gas cooler, condensing moisture in the gas to be processed, and collecting the condensed water Is also known (Japanese Patent Laid-Open No. 2013-39527).

  Furthermore, an absorption tower provided with a spray header having a spray nozzle for spraying the absorbing liquid onto the exhaust gas, a bottom tank for storing the absorbing liquid sprayed from the spray nozzle, and a pipe for circulating the absorbing liquid in the tank to the spray nozzle, and In the desulfurization apparatus having an inlet duct for introducing exhaust gas into the absorption tower main body and an outlet duct at the upper end, the absorption liquid is sprayed into the absorption tower main body near the absorption tower main body of the inlet duct, and its spray shape There is also known a flue gas desulfurization apparatus provided with a plurality of flat nozzles having a flat surface in a direction opposite to the spray absorbing liquid from the spray nozzle from which the water drops (Japanese Patent Laid-Open No. 2013-158765). Then, in order to make the contact between the exhaust gas and the absorbent more efficient in the rotating cylinder, the gas-liquid contact filling material is filled in the vertical rotating cylinder so as to desulfurize harmful gas by the present inventors. An apparatus is also known (Japanese Patent No. 4418987 and Japanese Patent Laid-Open No. 2013-237017).

JP 2011-177664 A JP2013-6125A JP 2013-39527 A JP 2013-158765 A Japanese Patent No. 4418987 JP 2013-237017 A Japanese Patent No. 4505041

The apparatuses disclosed in Patent Documents 1 to 4 have a structure in which the exhaust gas treatment apparatus main body flows exhaust gas in the vertical direction. Many of the conventional exhaust gas treatment apparatuses are not limited to those of the above-mentioned patent documents, and there are many systems in which exhaust gas flows in the vertical direction. The reason was that the experiment was easier when the exhaust gas flowed vertically. However, if the physical considered manner flowing exhaust gas vertically, required amount of treatment liquid circulating in the case of flowing the exhaust gas in a vertical direction using a cylinder having a diameter D is proportional to the above D ^2. On the other hand, when the exhaust gas is caused to flow in the horizontal direction, the necessary amount of processing liquid to be circulated is proportional to D.

That means
In the case of an exhaust gas treatment system with a diameter of 30 m, the area of the absorbent spraying part is

Exhaust gas absorption tower (vertical gas flow) π / 4 × 30 × 30 = 706.5m ²
Exhaust gas absorption device (horizontal gas flow) 30 × 3 = 90 m ² (In the case of flue gas desulfurization, the length of about 3 m is already determined by the examples and experimental examples described in Patent Documents 6 and 7 by the present inventors. Are known)
Therefore, 706.5 / 90 ≒ 7.85

It becomes.

In the case of an exhaust gas absorption tower, the spraying of the absorption liquid is a spray method, so 100 m ³ / m ² .h
In the case of a rotating packed bed, since it is a packed bed, if it is 50 m ³ / m ² .h, the total amount of processing liquid is
100 × 706.5 = 70,650m ³ / h in the exhaust gas absorption tower
When the exhaust gas flow is horizontal 50 × 90 = 4,500m ³ / h
Therefore, 70,650 / 4,500 ≒ 15.7.

Accordingly, the diameter D of the exhaust gas treatment device inevitably increases with the recent increase in the scale of flue gas desulfurization and carbon dioxide recovery. Of course, the horizontal direction is advantageous for the flow direction of the exhaust gas. I know that there is. Based on such knowledge, the present inventor has developed the inventions of Patent Document 5 and Patent Document 6 already described. In the case of the flue gas desulfurization method based on the limestone-gypsum method disclosed in Patent Documents 5 and 6, the length is about 3 m. Next, when considering the pressure loss of exhaust gas ventilation when the exhaust gas flow in the treatment apparatus is vertical and horizontal, when the exhaust gas flow is vertical, for example, the absorption liquid When the exhaust gas flow is exhausted from the bottom to the top and the exhaust gas flow is exhausted from the bottom to the top, the pressure loss of the ventilation is large because the flow of the absorbing liquid becomes the resistance of the exhaust gas exhaust flow.

On the other hand, when the flow of the exhaust gas is set to the horizontal direction, the flow of the absorbing liquid hardly inhibits the ventilation flow of the exhaust gas.
In other words, the relationship of pressure loss in this case is
When the exhaust gas flow is in the vertical direction> This means that the exhaust gas flow is in the horizontal direction, and it is understood that the wind turbine power of the exhaust gas ventilation is smaller and advantageous when the exhaust gas flow is in the horizontal direction. It is also possible to improve the absorption efficiency of the absorbing liquid by arranging the macro flow of the absorbing liquid in series in multiple stages.
In view of the above, the vertical direction of the exhaust gas absorption tower is more advantageous for a small-scale exhaust gas treatment apparatus having a diameter of 3.8 m or less, but in the case of a treatment apparatus having a diameter of more than 3.8 m, the horizontal direction is adopted. It turned out to be advantageous.

On the other hand, the chemical reaction process of limestone-gypsum flue gas desulfurization is considered as follows.
SO ₂ + H ₂ O ⇔ H ₂ SO ₃ (1)
CaCO ₃ ⇔ Ca ²⁺ ＋ CO ₃ ²⁻ (2)
Ca ²⁺ + H ₂ SO ₃ ⇔ CaSO ₃ + 2H ⁺ (3)
CaSO ₃ + 1/2 O ₂ + 2H ₂ O → CaSO ₄ · 2H ₂ O (Four)
In order to consider the speed of the above reaction, looking at page 153 (Page 515) of the Science Chronology part of Solution Chemistry, there are [Solubility product of gaseous water] and [Solubility product of sparingly soluble salt]. A table is displayed, showing that the solubility of sulfurous acid gas in water is the second highest after hydrogen chloride.

Therefore, when looking at calcium carbonate, it is classified as a poorly soluble salt, and its solubility product is
3.6 × 10 ^-9 . Since the reaction of the chemical reaction process (3) is a reaction between a base and an acid, the reaction rate is fast.
Therefore, the reactions (1) to (3) can be considered as reactions that dissolve limestone particles with sulfurous acid.
In this case, as can be understood from the explanation of the chemical reaction process described above, it can be said that the rotary packed bed is a stirring tank for limestone particle elution. In this case, the larger the apparatus is, the larger the diameter of the stirring tank is, the falling height of the absorbing liquid is increased, and the dropping speed is increased to further increase the stirring effect. That is, it can be seen that the amount of chemical reaction accompanying one drop of the absorbing liquid increases as the diameter of the rotating packed bed increases.

Next, considering the recovery of carbon dioxide, this includes the use of organic amines or potassium carbonate as an absorbent and the step of regenerating the absorbent. Therefore, it is desirable that the absorbent to be sent to the regeneration process step has fully fulfilled its role by sufficiently absorbing carbon dioxide. This is because supplying the absorbent that has not sufficiently performed the reaction function to the regeneration process wastes heat energy for regeneration. Since the solubility of CO ₂ in water is lower than that of SO ₂ , the exhaust gas flow is horizontal as described above, and the absorption liquid flow is a series of multistage absorption systems to increase the reaction efficiency of the absorbent. Is more advantageous.

  On the other hand, as for the exhaust gas treatment filler for promoting gas-liquid contact in the exhaust gas treatment apparatus, the most important thing is a filler with various complicated structures including those described in Patent Document 5 described above. It is premised on that it is low cost and highly practical. Further, it is necessary to increase the gas-liquid contact area as much as possible and to reduce the pressure loss of ventilation as much as possible. The packings of various complex structures so far are based solely on the idea of increasing the gas-liquid contact area, taking into account its mechanical strength, measures to prevent scaling (gypsum adhesion) and reduction of manufacturing costs. There are few things.

Therefore, the present inventor not only secures a large gas-liquid contact surface, but also improves durability with impact resistance applied to the filler, wear resistance, and load resistance due to high stacking. In addition, it has a structure in which scaling does not easily adhere and is easy to remove even if it adheres, and it can be used stably as a flue gas desulfurization device, carbon dioxide gas absorption device, and as a part of a power generation device for a long time. We have developed a gas-liquid contact packing that has a structure that can withstand temperatures and that can be obtained at a lower cost than conventional products. We have also developed an exhaust gas treatment device filled with such gas-liquid contact filler.

Therefore, in the packing of the present invention, since the length of the rotary packed bed is relatively short, there is no problem even if the length of the rotary packed bed is 3 m and is about 4 m to 5 m. Rather, while sacrificing some reduction in the surface area of the packing, firstly, reducing the ventilation pressure loss of the exhaust gas as much as possible, secondly, having excellent mechanical strength and not impairing durability, The development was focused on reducing the area of the inner surface of the cylinder that is easy to scale, and, fourthly, greatly reducing the material weight per packing.
In this case, the inventor tried to use a 75 mmφ × 75 mmφ pole ring in an experimental apparatus of 1 mφ, and a net ring with a thick wire diameter by a special order in actual machines of 3.2 mφ and 4.5 mφ. The question remained as to whether it could be used for large-capacity flue gas desulfurization equipment of 3 million Nm ³ / h class with a diameter of about 25-30 m.

  Of the currently known gas-liquid contact packings, Raschig ring has the highest mechanical strength and has a simple structure. There are examples in which Raschig rings, which are the packing materials charged in the packed tower, use ceramics and polymer materials having good corrosion resistance. Inside the packed tower, the liquid flows down along the surface of the packing, and the gas rises through the gaps between the packing and gas-liquid contact occurs. Therefore, in the large-capacity flue gas desulfurization apparatus described above based on the Raschig ring having a high mechanical strength, the flue gas desulfurization apparatus and the exhaust gas treatment packing of the present invention and the filling to make it possible to absorb carbon dioxide gas more reliably We developed an exhaust gas treatment device filled with materials.

  In other words, when the Raschig rings described above are used by being charged in the rotating packed bed, the packing can be rolled by random packing, but each packing (Raschig ring) is momentarily with respect to the gas flow direction. And change direction. In this case, if the cylinder axis direction of the packing coincides with the gas flow direction, the gas flows easily, and if the cylinder axis direction of the packing crosses the gas flow direction, the gas flows. It becomes difficult. As a result, there is a drawback that the pressure loss of the gas flow as the entire rotating packed bed is increased. Therefore, in the present invention, this point is improved, the gas pressure loss in the rotating packed bed is remarkably reduced, the area on the inner peripheral surface of the cylinder is slightly reduced to reduce the scaling adhesion, and low cost gas / liquid contact use. A filling material was developed.

The first invention relates to a filler for exhaust gas treatment in which a plurality of windows having a hole diameter of 1/3 to 1/3 of the diameter of the cylindrical body are provided in the circumferential direction in a cylindrical wall of the thin cylindrical body. In addition, an exhaust gas treatment filling comprising a plurality of windows having a hole diameter of one-third to one-third of the diameter in the cylindrical wall of a thin cylindrical body is provided in a rotary processing apparatus of a gas horizontal flow system. The present invention also relates to an exhaust gas treatment apparatus in which a large number are filled.
Further, in the second invention, in order to further enhance the function of the packing of the first invention described above, two types of large and small packings having the same structure as the packing of the first invention described above and having different cylindrical body diameters are used. Prepare the small filler (hereinafter referred to as “small filler”) on the inner diameter side of the larger filler (hereinafter referred to as “large filler”) and remove the small filler with the suspension holder. The present invention relates to a filler for exhaust gas treatment that is supported in a suspended state on a cylindrical body of a large filler. The present invention also relates to an exhaust gas treatment apparatus in which a large number of exhaust gas treatment fillers, which are a combination of two types of large and small fillers, are filled in a gas horizontal flow type rotary treatment apparatus.

According to the exhaust gas treatment filler of the first invention, since a plurality of windows having a hole diameter of 1/3 to 1/3 of the cylindrical body diameter are provided in the circumferential direction on the cylindrical wall of the thin cylindrical body, In the rotary processing device of the gas horizontal flow method, even if the gas flow intersects the axial direction of the opening at both ends of the packing, the gas flow can be passed through a plurality of windows formed in the cylinder wall. As a result, the pressure loss of the exhaust gas flow is greatly reduced, and the exhaust gas treatment efficiency is remarkably improved. In addition, the cylindrical wall surface of the thin-walled cylindrical body reduces the area inside the cylinder, which reduces the adhesion of scaling, improves maintainability, and simplifies the structure, thereby significantly reducing costs. be able to.
Further, since a large number of exhaust gas treatment fillers having the above-described configuration are filled in a gas horizontal flow type rotary processing apparatus, gas pressure loss can be remarkably reduced, and smoke treatment efficiency can be improved.

According to the exhaust gas treatment packing of the second invention, the small packing suspended in the cylindrical body of the large packing moves around along the inner surface of the large packing cylinder during use. Cleaning of the inner surface of the cylinder is promoted, and the gas-liquid contact area that is reduced as a result of the first invention can be increased. At the same time, since the hanging holder slides along the inner surface of the small filling cylinder, the inner peripheral surface of the small filling can be automatically cleaned, which greatly increases the durability of large and small fillings. it can.

The perspective view of the filler for waste gas treatment which is an Example of 1st invention. Sectional drawing of the filler for waste gas treatment which is an Example of 2nd invention. The principal part longitudinal cross-sectional view showing the outline of the gas horizontal direction flow type exhaust gas processing apparatus of the state which inserted the exhaust gas processing filler of this invention in the rotation packed bed. Sectional drawing of the AA line arrow direction in FIG.

(Configuration of exhaust gas treatment packing)
Hereinafter, an embodiment of the exhaust gas treatment filler 11 according to the first invention will be described.
As illustrated in FIG. 1, the exhaust gas treatment filler 11 according to the present invention has a hole diameter b of 1/3 to 1/3 of the opening diameter a of the cylindrical body 1 on the cylindrical wall of the thin cylindrical body 1. A plurality of windows 2 are provided in the circumferential direction of the cylindrical body 1. In the embodiment of FIG. 1, four windows 2 are formed in the circumferential direction of the cylindrical wall. If the diameter of the window 2 in this case is less than one third of the opening diameter a, the resistance of the exhaust gas flow increases and the pressure loss increases. Conversely, if the diameter of the window 2 exceeds two thirds of the opening diameter a, the pressure loss is further reduced, but the strength of the exhaust gas treatment filler 14 is reduced. As a result of the experiment, it was revealed that the limit of 2/3 is the limit.

  For the material of the cylindrical body 1 constituting the thin cylindrical body, it is desirable to use plastic or graphite in order to improve the durability. However, the present invention is not limited to this, and other metal materials, ceramics, hard rubber, Teflon (registered trademark), Teflon coating, or the like can be used. In the embodiment of the present inventor, the cylindrical body 1 constituting the thin-walled cylinder is a plastic of 90 mmφ × 90 mm (cylinder length) × 3 mm (thickness), and a 40 mmφ window 2 is provided on the cylindrical wall. Four locations were formed at equal intervals in the circumferential direction. A large number of these were introduced into the rotary packed bed of the gas horizontal flow type exhaust gas treatment apparatus, and an experiment was conducted. As a result, the pressure loss of the exhaust gas was small, and the contact efficiency with the absorbing liquid was very good.

  As for the size of the window 2 formed on the cylindrical wall of the cylindrical body 1, the pressure loss of the gas flow is large if it is less than one third of the diameter of the cylindrical body 1, and conversely, the diameter of the cylindrical body 1 is 3 If it exceeds 2 minutes, sufficient strength as a thin cylindrical body cannot be maintained. Therefore, as a result of the experiment, it has become clear that the size of the window 2 in this case needs to be a hole diameter that is one third to one third of the diameter of the cylindrical body 1.

Further, when the exhaust gas treatment device is formed by filling a plurality of exhaust gas treatment fillers having the above-described windows 2 in the circumferential direction of the cylindrical body 1 in a gas horizontal flow type rotary treatment device, the pressure loss of the exhaust gas is reduced. The gas-liquid contact is performed efficiently and ideal exhaust gas treatment is performed.

(Configuration of exhaust gas treatment equipment)
An example of the flue gas desulfurization apparatus charged with the exhaust gas treatment filler 11 in the present invention will be described based on the case where it is applied to the limestone-gypsum method flue gas desulfurization apparatus shown in FIGS. FIG. 3 shows an example of a harmful gas desulfurization apparatus, in which 3 is a fixed duct, 13 is a cage-type rotating cylinder, and 11 is a thin-walled cylinder described above which is inserted into the cage-type rotating cylinder 10. Gas-liquid contact packing comprising body 1 (hereinafter the same as "filler for exhaust gas treatment"), 12 is a slurry storage tank formed at the bottom of the cage-type rotating cylindrical body 10, and 15 is pumping up the slurry in the slurry storage layer 12 A slurry circulation pump that recirculates from the upper side of the cage-type rotating cylindrical body 10 to the outer peripheral surface of the side is shown. Further, the fixed duct 3 has a certain length in the horizontal direction in FIG. 3, and is provided with a gas inlet 4 on one side and a gas outlet 5 on the opposite side, with the substantially central part at the bottom and front. In addition, an internal space is formed in which the cage-type rotating cylindrical body 10 can be installed by being inflated in the back direction.

  In addition, the cage-type rotating cylindrical body 10 has a lattice with a spacing of about 80 to 85 mm on the circumferential surface in order to fill a large number of packings with a size of about 90φ × length: 90 mm × thickness: 3 mm in a random state. It is formed in a shape. The cage-type rotating cylindrical body 10 has a pair of bosses 7a around the horizontal shaft 8 with the side surface on one side facing the gas inlet 4 and the side surface on the other side facing the gas outlet 5 in the fixed duct 3.・ It is rotatably supported by 7b, and its left and right side surfaces are formed in a grid with a gap (about 80 to 85mm) so that the gas-liquid contact filler 11 inserted inside does not leak outward. Has been. Further, when the diameter of the squirrel-type rotating cylinder 10 is large, the squirrel-cylinder cylindrical body 10 has a small-diameter cylindrical body coaxial with the horizontal axis 8 as viewed from the gas discharge direction side of the fixed duct 3 and a diameter larger than this. If the inner space of the rotating cylindrical body 10 is divided into a plurality of spaces with a medium-diameter cylindrical body and a radial partition wall (both not shown), the inner space of the squirrel-shaped rotating cylindrical body 10 is likely to occur along with the rotation. It is possible to prevent the bias of the gas-liquid contact filler 11 that has entered, and to evenly position it, and to further improve the desulfurization efficiency.

  The horizontal shaft 8 that supports the cage-type rotating cylindrical body 10 is supported by bearings 9a and 9b, one end of which is on the gas inlet 4 side and the other end on the gas outlet 5 side. Further, as described above, the gas-liquid contact filler 11 is configured to be able to roll in the squirrel-cage rotating cylindrical body 10 as shown in FIG. Further, the slurry reservoir 12 is attached to the bottom of the fixed duct 3 described above and is formed at the lower part of the squirrel-cage cylindrical body 10. Reference numeral 13 denotes an air blowing device, 14 denotes a stirring device, and 16a and 16b denote gas seal plates. A pipe 18 for taking out gypsum is connected to the bottom of the slurry reservoir 12 through a valve 17. In this case, limestone powder slurry is used as the slurry stored in the slurry reservoir 12 and is supplied into the slurry reservoir 12 from the limestone slurry supply pipe 19.

  The slurry circulation pump 15 pumps up the slurry in the slurry reservoir 12 and scatters it on the upper outer peripheral surface and side surfaces of the cage-type rotating cylindrical body 10. In this case, the slurry pumped up from the slurry reservoir 12 by the pumping pump 15 (P) is located above one side in the circumferential direction with respect to the horizontal axis 8 of the cage-type rotating cylindrical body 10 through the pipes 15a and 15b. Jetted to the outer peripheral surface and the side surface, but the cage rotation by utilizing the deviation of the slurry weight balance by appropriately adjusting the shift to the one side in the circumferential direction with respect to the horizontal axis 8 of the cage-type rotating cylindrical body 10 It is assumed that the rotational speed of the cylindrical body 10 is adjusted.

(Operation and effect of exhaust gas treatment equipment)
In the configuration of the flue gas desulfurization apparatus using the limestone-gypsum method, the limestone powder slurry is continuously supplied from the limestone slurry supply pipe 19 into the slurry reservoir 12. The supplied slurry is constantly agitated by the agitating device 14 while being air purged by the air blowing device 13 in the reservoir 12 and sufficiently enriched in oxygen. The slurry is pumped up by the pump P of the pipe 15 serving as the slurry reflux means, and the pipe 15a and Disperse irrigation into the squirrel-cage rotating cylinder 10 through 15b.

Further, this dispersed irrigation does not necessarily require a spray nozzle, and may simply flow down from the tip of the supply pipe. In this case, the squirrel-cage rotating cylinder 10 filled with a filling such as the gas-liquid contact filling 11 can rotate with a slight torque from the symmetrical shape that rotates about the horizontal axis 8. Therefore, the dispersed irrigation to the squirrel-cylinder rotating cylinder 10 is, in this case, the upper outer peripheral surface and the side surface part closer to one side in the circumferential direction (toward the direction of rotation) with respect to the horizontal axis 8 of the squirrel-cage rotating cylinder 10 The squirrel-cage rotating cylinder 10 can be started to rotate on the principle of a water wheel by being injected into the water and refluxed in large quantities.

Accordingly, since the amount of slurry flowing down the semicircular portion of the cage-type rotary cylinder 10 on the rotation direction side is larger than that on the counter-rotation side of the cage-type rotary cylinder 10, torque proportional to the weight thereof is obtained. As a result, the cage-type rotating cylinder 10 can continue to rotate.
On the other hand, as for the required rotational speed of the cage-type rotating cylinder 10, it is sufficient that the gas passing through the fixed duct 3 is sufficiently brought into gas-liquid contact with the slurry when passing through the cage-type rotating cylinder 10. Therefore, about 3 rpm is sufficient. In this case, the gas-liquid contact tends to be inadequate if it is less than 1 rpm. On the contrary, even if it exceeds 7 rpm, the effect is hardly changed. Therefore, it is ideal that it is within the range of 1 to 7 rpm.

Further, the required rotational speed of these cage-type rotating cylinders 10 can be easily adjusted by adjusting the amount of slurry pumped by the pump P of the slurry reflux means 15, and the outer circumference of the cage-type rotating cylinder 10 can be adjusted. It can be easily adjusted by installing a bucket or pressure receiving plate for forward rotation or reverse rotation on the surface and adjusting the flow rate of slurry to each bucket or pressure receiving plate. The harmful gas is introduced into the fixed duct 3 from the gas inlet 4 by a blower (not shown), passes through the central squirrel-cage rotary cylinder 10, is sent to the gas outlet 5, and is exhausted through the mist separator 6. .

On the other hand, the slurry returned to the cage-type rotating cylinder 10 is affected by the gravity of the slurry flowing down in the cage-type rotating cylinder 10 and the rotation of the cage-type rotating cylinder 10 itself. The slurry liquid film formed on the surface flows down and falls into the storage tank 12 while performing a reaction by gas-liquid contact over a wide area with the gas passing through the fixed duct 3. The slurry dropped into the reservoir 12 contains a large amount of gypsum due to gas-liquid contact with the gas. In the reservoir 12, air purge is performed by the air blowing device 13 while stirring by the stirring device 14, and the slurry is sequentially circulated while replenishing fresh oxygen and dissolving limestone powder.

  In the case of the above configuration, the cage-type rotating cylinder 10 is filled with the packing material 11 at random, and each packing material 11 has a plurality of windows 2 formed on the peripheral wall surface. Even when the flow direction of the gas and the cylindrical axis direction of the filler 11 intersect, the ventilation pressure loss of the exhaust gas is reduced, and the wind turbine power is also reduced. Further, the weight of the entire cage-type rotating cylinder 10 is reduced, and the rotational power is also reduced. Note that the mechanical strength of the filler 11 can be increased by increasing the wall thickness or increasing the diameter of the cylinder.

  As described above, in the gas-liquid contact reaction process in the apparatus shown in FIGS. 3 and 4, the elution of limestone particles is a rate-determining step. Therefore, even if the surface area is reduced by forming the window 2 on the peripheral wall surface of the packing 11. It does not reduce the absorption function of the exhaust gas.

(When used in a carbon dioxide absorber)
Since the carbon dioxide absorption device is a large device, the height of the packed bed is increased, but the filler 11 of this embodiment has a mechanical strength that can sufficiently withstand the use thereof. In this case, both the cylindrical axial direction of the packing 11 of the present invention is made coincident with the flow direction of the exhaust gas, and a commercially available packing having a large surface area is provided in the cylindrical body 1 which is inferior in mechanical strength. This function can be fully exhibited at low cost. Further, in this case, since a series multi-stage system can be adopted for the flow of the absorbing solution, CO ₂ having a low solubility in water can be absorbed more effectively.

Furthermore, unlike the case of flue gas desulfurization, CO ₂ absorption is very large.
By the way, SO ₂ is about 1,000 ppm, that is, about 0.1%, whereas CO ₂ is 5 to 10%, so even if 5%, 5 / 0.1 = 50 times.
For this reason, in the absorption of CO ₂ , there is a possibility that the length of the packed bed becomes long. In this case, it is considered that the packing of the present invention having the feature that the pressure loss is small works more effectively. In addition, since the reaction amount is very large, a device for installing a heat exchange device in the fixed packed bed has been devised in order to prevent temperature rise due to generation of reaction heat depending on the type of absorbent (see Patent Document 7).

  As described above, the flue gas desulfurization device and the carbon dioxide gas absorption device can share the packing 11 of the present invention by simply changing the filling method, so that the cost can be reduced in this aspect, and the earth It is also very significant in terms of environmental conservation. In addition, when the exhaust gas treatment filler 11 of the first invention is used, the exhaust gas desulfurization device or the carbon dioxide gas absorption device has both the exhaust gas flow in the horizontal direction, so that these are integrated as one device. This also makes it possible to greatly simplify the configuration of various facilities.

(About the second invention)
Another embodiment of the exhaust gas treatment filler 11 of the first invention is proposed as the second invention as follows.
FIG. 2 shows a cross section of the structure of the exhaust gas treatment filler 11a according to the second invention.
The exhaust gas treatment filler 11a according to the second aspect of the present invention is the filler according to the first aspect of the present invention as shown in the cross-section of FIG. 2 in order to further enhance the function of the filler according to the first aspect of the present invention. 2 types of large and small packings having the same structure and different diameters are prepared, and the smaller packing (hereinafter referred to as “small packing”) 1B is replaced with the larger packing (hereinafter referred to as “large packing”). The small packing 1B is loaded on the inner diameter side of the large packing 1A in a loosely suspended state while being loaded on the inner diameter side of 1A.

In this case, a stainless steel wire is used for the hanging holder T, and a central portion somewhat longer than the axial length of the large filling 1A is set along the inner wall surface of the small filling 1B, and the left and right end directions thereof are the same at right angles. The rising portion T1 · T1 is formed by rising in the outer circumferential direction of the large filling 1A in a state where the end portion of the large filling 1A has a margin, and the leading end portion of the rising portion T1 · T1 is large. Bending at right angles so as to be parallel to the inner diameter side portion of the small filler 1B of the hanging holder T so as to be along the outer peripheral surface of the filler 1A, in a direction to abut each end of the locking portions T2 and T2. The small filler 1B is configured to be held loosely by the large filler 1A.

Further, an exhaust gas treatment packing comprising a combination of two types of large and small packings shown in FIG. 2 in which the above-mentioned small packing 1B is loosely held by the large packing 1A is similar to the first invention, as shown in FIG. It is also possible to fill and use a large number of gas horizontal direction flow type squirrel-cage rotating cylinders 10 shown in FIG. 4, and according to this, the exhaust gas treatment capacity can be improved more than the first invention.

(Another example)
Further, a plurality of windows 2 having a hole diameter of 1/3 to 1/3 of the diameter of the thin cylinder is provided in the circumferential direction of the thin cylinder on the cylindrical wall of the thin cylinder 1 having substantially the same diameter and length. A limestone-gypsum flue gas desulfurization device is formed by filling a large amount of the exhaust gas treatment filler 11 or the exhaust gas treatment filler 11a of the second aspect of the invention into a gas horizontal flow type rotation processing device, Subsequently, a window 2 having a hole diameter that is one-third to one-third of the diameter of the thin-walled cylinder is formed on the wall of the thin-walled cylindrical body 1 that is approximately equal in diameter and length in the horizontal flow direction of the exhaust gas. In the case where a plurality of exhaust gas treatment fillers 11 provided in the circumferential direction of FIG. 1 or a carbon dioxide absorption device filled with the exhaust gas treatment filler 11a of the second aspect of the present invention are connected in series, flue gas desulfurization and More efficient exhaust gas can be absorbed and absorbed simultaneously It is possible to carry out the management.

DESCRIPTION OF SYMBOLS 1 Cylindrical body 1A Large filling 1B Small filling 2 Window 3 Fixed duct 4 Gas inlet 5 Gas outlet 6 Mist separator 7a, 7b Bearing
8 Horizontal shafts 9a and 9b Boss 10 Cage type rotating cylinder 11 Gas-liquid contact (for exhaust gas treatment) filler 11a Gas-liquid contact (for exhaust gas treatment) filler 12 Slurry storage tank 13 Air blowing device 14 Stirrer 15 Slurry circulation pump 15a / 15b Pipe 16a / 16b Gas seal plate 17 Valve 18 Pipe 19 Limestone slurry supply pipe T Suspension holder T1 Rising part T2 Locking part

Claims (4)

A plurality of circular windows having a hole diameter of 1/3 to 1/3 of the diameter of the thin cylindrical body are provided in the circumferential direction of the thin cylindrical body on the cylindrical wall of the thin cylindrical body having substantially the same diameter and length. Prepare two types of large and small fillers having different cylindrical body diameters for the exhaust gas treatment filler, and replace the smaller one (hereinafter referred to as “small filler”) with the larger one (hereinafter “large filler”). with charged into the inner diameter side of) that the small packing by loosely held in a suspended state small packing by hanging holder in the cylindrical body of large packings along the cylindrical inner surface of the large packing The exhaust gas treatment packing is configured to move freely . A limestone-gypsum method flue gas desulfurization apparatus in which a large amount of the exhaust gas treatment packing according to claim 1 is filled in a gas horizontal flow type rotary processing apparatus. A carbon dioxide absorbing device filled with the exhaust gas treatment filler according to claim 1 and having a horizontal gas flow direction. A limestone-gypsum flue gas desulfurization device is formed by filling a large amount of the exhaust gas treatment filler according to claim 1 in a gas horizontal flow type rotary processing device, and subsequently, according to claim 1. A flue gas desulfurization and carbon dioxide absorption device characterized by comprising a carbon dioxide absorption device continuously filled with the exhaust gas treatment filler described above .

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