JP2006116378A - Desulfurization equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure the desulfurization capacity of desulfurization equipment and to achieve the compactification and cost reduction of the desulfurization equipment. <P>SOLUTION: In the desulfurization equipment is constituted so as to remove a sulfur oxide in an exhaust gas X by spraying a predetermined sulfur removing liquid Y in the exhaust gas X containing the sulfur oxide in a treatment column 2 and equipped with an exhaust gas introducing port 21 for introducing the exhaust gas X into the treatment column 2, a plurality of the spray nozzles 6 arranged to the region above the exhaust gas introducing port 21 to spray the sulfur removing liquid Y and a ventilation shield plate 9 provided along the side wall 23 of the treatment column 2 to cut off the ventilation of the exhaust gas X. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a desulfurization apparatus.

  For example, sulfur oxide (SOx) is contained in the exhaust gas of a coal-fired boiler installed in a thermal power plant or the like. The sulfur oxide contained in the exhaust gas needs to be removed because it causes acid rain and the like when released into the atmosphere as it is. For this reason, in a thermal power plant or the like, a desulfurization device is installed on the downstream side of the boiler to remove sulfur oxides in the exhaust gas and then release it into the atmosphere.

This desulfurization apparatus is an apparatus for removing sulfur oxides from exhaust gas by spraying sulfur removal liquid on the exhaust gas in the treatment tower, and spray nozzles for spraying the sulfur removal liquid are provided in multiple stages in the treatment tower. Several are arranged.
JP 2003-103139 A JP 2004-24945 A JP 2001-120948 A

  By the way, in the conventional desulfurization apparatus, as described above, the sulfur oxides in the exhaust gas are removed by spraying the sulfur removal liquid on the exhaust gas from the spray nozzles arranged in multiple stages in the treatment tower. Since the sulfur removing liquid is not sprayed from the plurality of spray nozzles in the vicinity of the side wall of the processing tower, a phenomenon occurs in which the liquid film near the side wall of the processing tower becomes thin. Moreover, in order to suppress wear of the side wall due to direct contact with the sulfur removing liquid sprayed from the spray nozzle, the spray nozzle is generally arranged at a predetermined distance from the side wall. For this reason, the phenomenon that the liquid film in the vicinity of the side wall of the processing tower becomes even thinner occurs.

  When the liquid film near the side wall of the processing tower becomes thin in this way, the exhaust gas along the side wall of the processing tower blows through the thin part of the liquid film, and desulfurization in the exhaust gas may be insufficient. For this reason, in the conventional desulfurization apparatus, the above-mentioned problems can be solved by installing spray nozzles in multiple stages (for example, 10 stages) or changing the position of the spray head connected to the spray nozzles for each stage. I have done it.

  However, recent desulfurization apparatuses are desired to be compact and reduce costs while maintaining desulfurization performance, and it is desirable to reduce the number of spray nozzles and to facilitate design. For this reason, a technique for reducing the size and cost of the apparatus without reducing the desulfurization performance is desired.

  JP-A-2003-103139, JP-A-2004-24945, and JP-A-2001-120948 describe a desulfurization apparatus in which a spray nozzle is reduced as compared with a conventional desulfurization apparatus. However, even if any of these is used, it is difficult to sufficiently prevent the exhaust gas along the side wall of the processing tower from blowing through the thin portion of the liquid film.

  The present invention has been made in view of the above-described problems, and an object thereof is to ensure desulfurization performance and reduce the size and cost of the apparatus.

  In order to achieve the above object, in the present invention, as a first means, the sulfur oxide in the exhaust gas is sprayed by spraying a predetermined sulfur removing liquid on the exhaust gas containing sulfur oxide in the treatment tower. A desulfurization apparatus for removing, an exhaust gas introduction port for introducing the exhaust gas into the treatment tower, a plurality of spray nozzles disposed above the exhaust gas introduction port and spraying the sulfur removal liquid, and the treatment tower A structure is provided that includes a blow-off blocking plate that blocks the blow-off of the exhaust gas along the side wall.

  As a second means, in the first means, a configuration is adopted in which the spray nozzles are arranged in a plurality of stages, and the blow-off blocking plate is provided for each stage of the spray nozzles.

  As a third means, in the first or second means, the blow-off blocking plate is directly sprayed with the sulfur removing liquid sprayed from the spray nozzle disposed at the endmost in the plan view among the spray nozzles. A configuration is adopted in which it is arranged at a certain position.

  According to the desulfurization apparatus according to the present invention, since the blow-off blocking plate for blocking the blow-off of the exhaust gas along the side wall of the processing tower is provided, the blow-off of the exhaust gas along the side wall of the treatment tower is blocked by the blow-off blocking plate. To the center of the processing tower. For this reason, the exhaust gas desulfurization efficiency can be sufficiently ensured. In addition, according to the desulfurization apparatus according to the present invention, the exhaust gas desulfurization efficiency can be sufficiently ensured, so that the number of spray nozzles can be reduced, and the apparatus can be reduced in size and cost. Become.

  Hereinafter, an embodiment of a desulfurization apparatus according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to facilitate recognition of each member.

(First embodiment)
FIG. 1 is a cross-sectional view illustrating a schematic configuration of a desulfurization apparatus 1 according to the first embodiment. As shown in this figure, the desulfurization apparatus 1 according to the first embodiment includes an absorption tower 2 (treatment tower), an exhaust gas introduction path 3, and an exhaust gas discharge path 4.

  The absorption tower 2 is arranged, for example, on the downstream side of a coal-fired boiler of a thermal power plant, and is sulfur-removed with respect to the exhaust gas X discharged from the boiler in the inside of the cylindrical shape. By spraying the liquid Y, the sulfur oxide in the exhaust gas X is removed. An exhaust gas introduction port 21 for introducing the exhaust gas X into the absorption tower 2 is formed in a substantially central portion of the absorption tower 2 in the height direction, and a boiler of a thermal power plant or the like is formed in the exhaust gas introduction port 21. Is connected to the exhaust gas introduction path 3. Further, an exhaust gas discharge port 22 for discharging the exhaust gas X to the outside of the absorption tower 2 is formed in the upper part of the absorption tower 2, and the exhaust gas discharge port 22 and the exhaust gas discharge path 4 are connected. A mist eleminator 5 that collects and removes the sulfur removal liquid Y contained in the exhaust gas X from the exhaust gas X is installed in the exhaust gas discharge path 4.

  A plurality of spray nozzles 6 for spraying the sulfur removing liquid Y are arranged in the upper part of the absorption tower 2. The spray nozzles 6 are arranged in a plurality of stages (three stages in the first embodiment), and a plurality of spray nozzles 6 are arranged in each stage. These spray nozzles 6 are connected to a spray header 7 that supplies the sulfur removal liquid Y to the spray nozzle 6. And this spray header 7 is connected with the lower part of the absorption tower 2, The pump 8 is installed in the middle site | part.

  Further, the desulfurization apparatus 1 according to the first embodiment includes a blow-off blocking plate 9 that blocks blow-off of the exhaust gas X along the side wall 23 of the absorption tower 2 inside the absorption tower 2. As shown in FIG. 1, the blow-off blocking plate 9 is disposed substantially perpendicular to the side wall 23 of the absorption tower 2 above the exhaust gas inlet 21 and below the spray nozzle 6. As shown in the plan view of FIG. 2, the blow-off blocking plate 9 is shaped like a ring so as to be arranged over the circumference of the absorption tower 2, and as shown in the partially enlarged sectional view of FIG. 3. It is fixed to the side wall 23 of the absorption tower 2 by the fixture 10. Further, as shown in FIG. 3, the blow-off blocking plate 9 is disposed at a position where the sulfur removal liquid Y sprayed from the spray nozzle 61 disposed at the endmost part in a plan view is directly sprayed. Thus, by arranging the blow-off blocking plate 9 at a position where the sulfur removing liquid Y is directly sprayed, it is possible to prevent the sulfur removing liquid Y from being directly sprayed on the side wall 23 of the absorption tower 2, It becomes possible to suppress wear and corrosion of the side wall 23. In addition, since the sulfur removing liquid Y is directly sprayed on the blow-off blocking plate 9, the blow-off blocking plate 9 is worn and corroded by the sulfur removing liquid Y. Since maintenance such as replacement can be easily performed as compared with maintenance of the side wall 23 of the absorption tower 2, maintenance of the desulfurization apparatus 1 can be facilitated. In addition, a protective film 11 for suppressing wear and corrosion of the side wall 23 due to the sulfur removing liquid Y is formed on the side wall 23 located on the upper part of the blow-off blocking plate 9. Wear and corrosion are further suppressed.

  Returning to FIG. 1, the lower part of the absorption tower 2 to which the spray header 7 is connected is configured as a storage tank 24 in which the sulfur removal liquid Y sprayed from the spray nozzle 6 is stored. That is, the sulfur removal liquid Y is circulated in the absorption tower 2 through the spray header 7 by driving the pump 8.

  In addition, a stirring device 12 for stirring the sulfur removal liquid Y stored in the storage tank 24 is installed in the lower part of the absorption tower 2, that is, the storage tank 24, and air is supplied into the storage tank 24. For this purpose, an air supply pipe 13 is connected. The sulfur removal liquid Y contains calcium carbonate. And in the storage tank 24, the sulfur removal liquid Y which absorbed the sulfur oxide in the exhaust gas X is stirred by the stirring device 12 together with the air supplied through the air supply pipe 13, so that the sulfur removal liquid Y is Oxidized to produce calcium sulfate (gypsum).

  In addition, a sulfur removal liquid discharge pipe 14 for discharging a part of the sulfur removal liquid Y to the outside is connected to the middle portion of the spray header 7, and the sulfur removal liquid Y is connected through the sulfur removal liquid discharge pipe 14. Calcium sulfate produced in the storage tank 24 together with a part of the water is discharged.

  Next, operation | movement of the desulfurization apparatus 1 which concerns on this 1st Embodiment comprised in this way is demonstrated.

  First, the sulfur removal liquid Y stored in the storage tank 24 is supplied to each spray nozzle 6 via the spray header 7 by driving the pump 8. And the sulfur removal liquid Y supplied to the spray nozzle 6 is sprayed radially from each spray nozzle 6 downward. Here, as shown in FIG. 3, the side wall 23 side of the sulfur removing liquid Y sprayed radially from the spray nozzle 61 located at the extreme end in a plan view is similar to the sulfur removing liquid Y sprayed from the other spray nozzle 61. Do not overlap. Therefore, the liquid film of the sulfur removal liquid Y in the vicinity of the side wall 23 of the absorption tower 2 becomes thin. For this reason, if the exhaust gas X blows around the side wall 23 of the absorption tower 2, the removal efficiency of the sulfur oxide of the exhaust gas X is lowered.

  The exhaust gas X introduced into the absorption tower 2 through the exhaust gas inlet 3 flows upward from a substantially central portion in the height direction of the absorption tower 2. Here, the desulfurization apparatus 1 according to the first embodiment includes a blowout blocking plate 9 that blocks blowout of the exhaust gas X along the side wall 23 of the absorption tower 2. For this reason, the blow-off of the exhaust gas X that is going to rise along the side wall 23 of the absorption tower 2 is blocked by the blow-off blocking plate 9 and is brought to the center of the absorption tower 2, and the liquid film of the sulfur removal liquid Y Rises in a state in which it is prevented from blowing through the vicinity of the side wall 23 of the absorption tower 2.

  Then, the sulfur oxide in the exhaust gas X is removed in contact with the sulfur removing liquid Y by passing through the portion where the liquid film of the sulfur removing liquid Y is thick. That is, according to the desulfurization apparatus 1 according to the first embodiment, the exhaust gas X can be prevented from blowing through the vicinity of the side wall 23 of the absorption tower 2 where the liquid film of the sulfur removal liquid Y becomes thin. The removal efficiency of the contained sulfur oxide can be improved. Thus, according to the desulfurization apparatus 1 which concerns on this 1st Embodiment, since the removal efficiency of the sulfur oxide contained in the waste gas X can be improved, the removal efficiency of the sulfur oxide similar to the conventional desulfurization apparatus Can be maintained, the number of installation stages of the spray nozzle 6 can be reduced as compared with the conventional desulfurization apparatus. For this reason, the height of the absorption tower 2 can be made lower (compact) than the height of the absorption tower of the conventional desulfurization apparatus. For example, the cost of the foundation supporting the absorption tower 2 can be reduced. Therefore, according to the desulfurization apparatus 1 according to the first embodiment, desulfurization performance can be ensured and the apparatus can be reduced in size and cost.

  In the desulfurization apparatus 1 according to the present embodiment, dust contained in the exhaust gas X is also adsorbed and removed by the sulfur removal liquid Y when the exhaust gas X contacts the sulfur removal liquid Y. According to the desulfurization apparatus 1 according to the first embodiment, since the exhaust gas X passes through a thick portion of the liquid film of the sulfur removal liquid Y, the desulfurization apparatus 1 according to the first embodiment is included in the exhaust gas X. It is also possible to ensure the dust removal performance.

  The exhaust gas X from which sulfur oxides have been removed by contacting with the sulfur removal liquid Y further rises together with the fine droplet-shaped sulfur removal liquid Y, and is discharged to the outside of the desulfurization apparatus 1 through the exhaust gas discharge path 4. . Here, when the exhaust gas X passes through the exhaust gas discharge passage 4, the fine droplet-shaped sulfur removal liquid Y is collected and removed by the mist eleminator 5, and only the exhaust gas X is discharged to the outside of the desulfurization apparatus 1.

  Further, the sulfur removal liquid Y that has absorbed sulfur oxides and dropped downward by contacting with the exhaust gas X is stored in the storage tank 24. Then, air is supplied into the storage tank 24 through the air supply pipe 13, and the sulfur removing liquid Y is stirred together with the air by the stirring device 12, whereby calcium sulfate is generated. Then, the calcium sulfate and the sulfur removal liquid Y flow into the spray header 7 by driving the pump 8, and a part of the sulfur removal liquid Y and the calcium sulfate are discharged to the outside of the desulfurization apparatus 1 through the sulfur removal liquid discharge pipe 14, The remaining sulfur removing liquid Y is supplied again to the spray nozzle 6.

  In the technique disclosed in Japanese Patent Application Laid-Open No. 2004-24945, a ring-shaped wall falling liquid dispersion plate is described in the absorption tower, but this wall flowing liquid dispersion plate flows down the side wall of the absorption tower. It is for dispersing and dropping the sulfur removing liquid, and it always has holes for the sulfur removing liquid to pass through the wall falling liquid dispersing plate. Since the wall falling liquid dispersion plate in which such holes are formed cannot have the function of blocking the exhaust gas X blow-off like the blow-off blocking plate 9 of the present invention, it is described in JP-A-2004-24945. The wall falling liquid dispersion plate and the blow-off blocking plate of the present invention are completely different.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the description of the second embodiment, the description of the same parts as in the first embodiment will be omitted or simplified.

  FIG. 4 is a cross-sectional view showing a schematic configuration of the desulfurization apparatus 30 according to the second embodiment. As shown in this figure, in the desulfurization apparatus 30 according to the second embodiment, the spray nozzles 6 are arranged in two stages, and further, blow-off blocking plates 91 and 92 are installed obliquely below the spray nozzles 6. ing. That is, in the desulfurization apparatus 30 according to the second embodiment, the blow-off blocking plates 91 and 92 are provided for each stage where the spray nozzle 6 is disposed.

According to the desulfurization apparatus 30 according to the second embodiment having such a configuration, as shown in FIG. 5, the exhaust gas X wraps around the back side of the blow-off blocking plate 91 installed below. However, the blow-off blocking plate 92 disposed above the countercurrent blocking plate 91 makes it possible to bring the exhaust gas X sneaking around to the back side of the blow-through blocking plate 91 to the central portion of the absorption tower 2. For this reason, the exhaust gas X can pass through the thick part of the liquid film of the sulfur removal liquid Y more reliably, and the desulfurization performance can be improved further than the desulfurization apparatus 1 shown in the first embodiment. Become. For this reason, even when the number of spray nozzles 6 is further reduced as compared with the first embodiment, the same desulfurization performance as that of the conventional desulfurization apparatus can be maintained, and further downsizing and cost reduction of the apparatus can be realized. be able to.
In addition, the blow-off blocking plates 91 and 92 in the second embodiment are similar to the blow-off blocking plate 9 in the first embodiment in that the sulfur removal liquid Y sprayed from the spray nozzle 6 located at the extreme end in a plan view is used. It is arranged at a position where it is directly injected.

As mentioned above, although preferred embodiment of the desulfurization apparatus based on this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the blow-off blocking plates 9, 91, 92 are arranged substantially perpendicular to the side wall 23 of the absorption tower 2. However, the present invention is not limited to this, and the blow-off blocking plates 9, 91, 92 may be inclined with respect to the side wall 23 of the absorption tower 2.

It is sectional drawing which showed schematic structure of the desulfurization apparatus 1 which concerns on 1st Embodiment of this invention. It is a top view of the blow-off blocking plate 9 provided in the desulfurization apparatus 1. It is a partial expanded sectional view of the blow-off blocking plate 9 vicinity with which the desulfurization apparatus 1 is provided. It is sectional drawing which showed schematic structure of the desulfurization apparatus 30 which concerns on 2nd Embodiment of this invention. 2 is a partially enlarged cross-sectional view in the vicinity of the blow-off blocking plates 91 and 92 provided in the desulfurization apparatus 30. FIG.

Explanation of symbols

1,30 …… Desulfurization equipment 2 …… Absorption tower (treatment tower)
21 …… Exhaust gas inlet 23 …… Side wall 6 …… Spray nozzle 9, 91, 92 …… Blow-off blocking plate X …… Exhaust gas Y …… Sulfur remover

Claims (3)

A desulfurization apparatus that removes the sulfur oxide in the exhaust gas by spraying a predetermined sulfur removing liquid on the exhaust gas containing sulfur oxide in the treatment tower,
An exhaust gas inlet for introducing the exhaust gas into the processing tower;
A plurality of spray nozzles disposed above the exhaust gas inlet and spraying the sulfur removing liquid;
A desulfurization apparatus comprising: a blowout blocking plate that blocks blowout of the exhaust gas along a side wall of the treatment tower. The desulfurization apparatus according to claim 1, wherein the spray nozzles are arranged in a plurality of stages, and the blow-off blocking plate is provided for each stage of the spray nozzles. 3. The blow-off blocking plate is disposed at a position where the sulfur removing liquid sprayed from the spray nozzle disposed at the endmost part in the spray nozzle is directly sprayed among the spray nozzles. Desulfurization apparatus as described.

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