JP2002219330A - Two-chamber type wet exhaust gas desulfurization equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a two-chamber type wet exhaust gas desulfurization equipment capable of preventing the lowering of desulfurization capacity by suppressing a gas drift in a descending flow region without increasing the power of a desulfurization fan, high in reliability and capable of being operated stably. SOLUTION: A gas rectifying means (a guide vane 18 protruded from the leading end of a partition plate to an ascending flow region side) is provided to the leading end of the partition plate 4 dividing the space in an absorbing column main body 1 into the ascending flow region 12 and the descending flow region 13. The revolving radius in the reversing part of a gas flow is ensured by the guide vane 18 and a start point of revolution is preliminarily shifted toward the ascending flow region 12 by the revolving radius. Therefore, the flow of exhaust gas begins to revolve at the leading end of the guide vane 18 and the exhaust gas flows in the descending flow region 13 almost uniformly over the whole of the cross-sectional direction of the gas flow of the descending flow region 13 while flows along the guide vane 18 without being peeled from the partition plate and without forming a vortex.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sulfur oxide (hereinafter referred to as SO) in exhaust gas discharged from a combustion device such as a boiler.
2), and in particular, by installing a partition plate inside the absorption tower, two gas-liquid contact portions of an upward flow region where exhaust gas flows upward and a downward flow region where exhaust gas flows downward. The present invention relates to a two-chamber wet flue gas desulfurization apparatus having a function of preventing gas drift in a downflow region in a two-chamber desulfurization apparatus divided into two sections.

[0002]

2. Description of the Related Art Sulfur oxides in flue gas generated by the combustion of fossil fuel in a combustion device in a thermal power plant, among which SO2 is one of the main causes of environmental problems such as air pollution and acid rain. In recent years, the spread of flue gas desulfurization equipment on a global environmental scale has been desired.

In the current desulfurization system, a wet method based on a limestone-gypsum method occupies the mainstream, and a spray type desulfurization apparatus, which is the most proven and highly reliable, is widely used worldwide. This spray type desulfurization equipment has high desulfurization performance,
Basic technology is almost established.

[0004] However, the wet flue gas desulfurization equipment is expensive, and its penetration rate in developing countries is still low. Therefore, in order to increase the penetration rate of desulfurization equipment worldwide,
It is necessary to significantly reduce equipment costs and operation costs of the desulfurization unit.

[0005] Fig. 17 shows a conventional example of a spray type two-chamber wet flue gas desulfurization apparatus of the prior art which has been reduced in cost.

The wet flue gas desulfurization apparatus shown in FIG. 17 mainly comprises an absorption tower main body 1, an inlet duct 2, an outlet duct 3, a partition plate 4,
Absorbent circulating pump 5, circulating tank 7, stirrer 8, air blowing pipe 9, mist eliminator 10, absorbing liquid outlet pipe 1
1, upflow area 12, downflow area 13, circulation pipe 14,
It comprises a spray header 15, spray nozzles 16-17, a perforated plate 29, and the like. Spray nozzles 16 and 17
Are provided in a cross section orthogonal to the gas flow, and are further provided in a plurality of stages in the gas flow direction. Further, the stirrer 8 and the air blowing pipe 9 are installed in the circulation tank 7 in which the absorbing liquid 6 stays, and the mist eliminator 10 is installed in the outlet duct 3.

The exhaust gas discharged from the boiler (not shown) is introduced into the absorption tower body 1 from the inlet duct 2 in a substantially horizontal direction by a desulfurization fan (not shown), and is discharged from the outlet duct 3. Most of the absorption towers employing the spray method discharge exhaust gas introduced from the lower part of the absorption tower from the top of the tower in order to bring the exhaust gas and the absorbent 6 into countercurrent contact.

[0008] A partition plate 4 is installed in the absorption tower main body 1 to divide the space in the absorption tower main body 1 into two chambers.
Is provided at substantially the same height as the inlet duct 2, the exhaust gas introduced from the inlet duct 2 is blocked by the partition plate 4,
After ascending in the upflow area 12 and inverting at the top of the tower, it passes through the perforated plate 29 and descends in the downflow area 13. In the meantime, in the upflow region 12 and the downflow region 13, the absorbing solution 6 containing calcium carbonate sent from the absorbing solution circulating pump 5 is used.
Is sprayed from spray nozzles 16 and 17 provided in the respective regions 12 and 13, and gas-liquid contact between the absorbent 6 and the exhaust gas is performed.

At this time, the SO 2 in the exhaust gas is
Is selectively absorbed and oxidized in the circulation tank 7 to produce calcium sulfate (gypsum). A part of the absorption liquid 6 in the circulation tank 7 where calcium carbonate and gypsum coexist is again sprayed by the absorption liquid circulation pump 5 to spray nozzles 16 and 1.
7 and a part is sent to a waste liquid treatment / gypsum collection system (not shown) from the absorbent extraction pipe 11. Among the absorption liquids 6 atomized by spraying from the spray nozzles 16 and 17, those having a small droplet diameter are entrained by the exhaust gas, but are collected by the mist eliminator 10 provided in the outlet duct 3. .

In the prior art shown in FIG. 17, since the outlet duct 3 is provided at substantially the same height as the inlet duct 2, the supporting steel frames (not shown) of the mist eliminator 10 and the outlet duct 3 are low and simple. In addition, the length of the duct for connecting to the heat exchanger (reheating side) (not shown) can be reduced.

[0011]

However, FIG.
In the case of the two-chamber type absorption tower shown in the figure, the exhaust gas rising in the upflow region 12 is reversed at the top of the tower and introduced into the descending flow region 13, so that the exhaust gas flows downward due to the inertia of the exhaust gas at the top of the tower. It is easy to flow to the exit duct 3 side of the area 13 and FIG.
As shown in the simulation of FIG. 8, the gas flow largely drifts. If gas drift occurs, the desulfurization performance in the downflow region 13 will decrease. Further, as can be seen from the gas flow shown in FIG. 18, a large vortex is generated on the leading end side of the partition plate 4 in the descending flow region 13. When the vortex is generated, the pressure loss of the absorption tower increases, and the power of a desulfurization fan (not shown) increases.

Therefore, it is necessary to take measures for preventing gas drift at the entrance of the downflow region 13. In this regard, in the prior art, the flow is rectified by installing the perforated plate 29 at the entrance of the descending flow region 13.
When the gas flow rate of 3 is increased, when the perforated plate 29 is used, the pressure loss increases rapidly, and scaling on the perforated plate 29 due to calcium sulfite or gypsum tends to occur.

An object of the present invention is to suppress gas drift in a downflow region without increasing the power of a desulfurization fan, thereby preventing a decrease in desulfurization performance, and providing a highly reliable and stable operation. It is an object of the present invention to obtain a room-type wet flue gas desulfurization device.

[0014]

The above object of the present invention can be attained by providing a gas rectifying means at the tip of a partition plate which divides the space inside the absorption tower body into two chambers.

That is, the present invention provides an inlet duct for introducing exhaust gas discharged from a combustion device such as a boiler in a substantially horizontal direction, and an outlet duct for discharging purified exhaust gas in a substantially horizontal direction. An exhaust gas channel is provided between the outlet ducts, and a vertical partition plate having an opening on the ceiling side is provided to divide the exhaust gas channel into two chambers on the inlet duct side and the outlet duct side, The upward flow region where the exhaust gas introduced from the inlet duct flows upward at the partition plate and the downward flow region where the exhaust gas flows downward toward the outlet duct after being reversed at the opening on the ceiling side are formed. An absorption tower for treating sulfur oxides in exhaust gas provided with a spray nozzle in each of the above regions so as to make countercurrent contact with the exhaust gas in the upflow region and to make cocurrent contact in the downward flow region; In the two-chamber type wet flue gas desulfurization apparatus and a circulating tank for storing the absorbing solution slurry ejected from spray nozzles in a two-chamber type wet flue gas desulfurization apparatus having a gas rectifying means the partition plate tip.

One of the gas rectification means of the present invention is a guide vane projecting from the leading end of the partition plate toward the upward flow region.

As the guide vane, a plate member having a shape bent at least one step toward the upstream side of the gas flow can be used, and it is desirable that the tip of the guide vane is directed almost downward. When the number of bending steps is infinite, a semi-cylindrical guide vane is obtained.

Further, among the spray nozzles installed in the upward flow area, the spraying direction of the absorbing liquid of the spray nozzle near the guide vane is directed upward, so that scaling does not adhere to the guide vane.

Further, as the gas rectification means provided at the tip of the partition plate of the present invention, a perforated plate extending from the tip of the partition plate toward the top of the tower can be used.

The perforated plate may be provided with a large number of perforations having a reduced aperture ratio from the top to the bottom.

Further, a guide vane may be provided on the downflow region side of the perforated plate.

[0022]

The cause of the gas drift and the increase in pressure loss in the downflow region of the absorption tower in the prior art is that the flow of exhaust gas is reversed by separating one partition plate which divides the space inside the absorption tower body into two chambers. In the structure. When bending or reversing the flow of exhaust gas, a turning radius is required inside the bent portion, and if the turning radius is not sufficiently ensured, a vortex is generated downstream of the bent portion due to separation of the gas flow. Losses will increase.

Further, when the gas flow starts to swirl from the leading end of the partition plate, the inside position of the main flow portion of the gas flow located downstream of the bent portion of the gas flow is shifted toward the outlet duct by an amount corresponding to the turning radius. Therefore, the gas flow is largely deviated.

Therefore, in the present invention, the swirl radius of the gas flow is secured by the guide vanes projecting from the tip of the partition plate toward the upflow region, and the starting point of the swirl is shifted in advance by the swirl radius toward the upflow region. I have. As a result, the flow of exhaust gas begins to turn around the tip of the guide vane,
While flowing along the guide vanes, the gas flows almost uniformly over the entire cross-sectional direction of the gas flow in the descending flow region without separating from the partition plate and without forming a vortex. Unlike the rectification method in which a pressure loss is applied to a gas flow as in the prior art perforated plate 29 shown in FIG. 17, the resistance of the guide vanes is almost zero, so that the gas flow can be performed without increasing the pressure loss of the gas flow. Can be rectified.

Therefore, the gas drift is suppressed in the spray portion in the downflow region, so that the desulfurization performance does not decrease. Also, the generation of vortices in the downflow region is prevented,
Furthermore, since there is no increase in pressure loss due to the guide vane,
The power of the desulfurization fan is also reduced.

Further, by using a perforated plate extending from the end of the partition plate toward the top of the tower as gas rectification means provided at the end of the partition plate, separation of gas flow can be suppressed and rectification can be performed.

In the case where the gas flow is bent or reversed, it is ideal that the gas flow velocity in the radial direction of rotation is distributed so as to increase in proportion to the distance from the center of rotation in order to suppress separation of the gas flow. However, in a two-chamber type desulfurization apparatus, the flow velocity becomes maximum at the upper end of the partition plate, which is the center of rotation of the gas flow. For this reason, the flow separates on the descending flow side of the partition plate, and a vortex is generated.

By using the perforated plate extending from the tip of the partition plate toward the top of the tower according to the present invention, the speed of the upper end portion of the partition plate, which causes separation of the gas flow, is gradually reduced from the top of the column toward the bottom. Separation of gas flow and gas drift can be prevented.

Further, by providing a large number of perforations with a reduced aperture ratio from the top to the bottom of the perforated plate, the flow rate can be gently reduced from the top to the bottom of the perforated plate.

As a technique for preventing drift, there is known a method of installing a perforated plate having a constant aperture ratio in a part of a flow path bent at a right angle (Japanese Patent Laid-Open No. 8-110008). In a gas flow path in which the flow direction is reversed by 180 degrees at the top of the tower as described above, the flow tends to separate, so it is more preferable to use the gas rectification means of the present invention.

Further, by providing guide vanes on the downstream side of the perforated plate extending from the tip of the partition plate of the present invention to the top of the tower, the flow direction of the gas passing through the perforated plate is forcibly bent to prevent drift. can do.

By the action of the gas rectifying means provided at the leading end of the partition plate of the present invention, separation and drift of the gas flow on the downflow side of the partition plate are prevented, and increase in pressure loss is suppressed.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of an absorption tower in which a guide vane is installed at a leading end of a partition plate, showing a structure of an absorption tower according to an embodiment. FIG. 2 shows the gas flow from the top of the tower to the entrance of the downflow area when the partition plate provided with the guide vanes of FIG. 1 is installed in the absorption tower. 3 to 12 show examples in which the shape of the guide vanes in the embodiment of FIG. 1 is variously changed. FIG. 13 shows the spray nozzle installed in the upward flow region in the embodiment of FIG. 1 in which the spray direction of the absorbing liquid of the spray nozzle near the guide vane is directed upward.

Reference numerals 1 to 17 of members constituting the absorption tower of the embodiment shown in FIGS. 1 to 13 are the same as those used in the absorption tower of the prior art, and the description thereof will be omitted. The embodiment of the present invention is characterized in that a guide vane 18 protruding from the front end toward the upward flow region 12 is provided at the front end of the partition plate 4.

In the embodiment shown in FIG. 1, a guide vane 18 having a shape obtained by bending a plate in three stages is provided at the end of the partition plate 4 so as to protrude toward the upward flow region 12 side. For this reason, the exhaust gas introduced from the inlet duct 2 rises in the upflow region 12 and then reverses at the top of the tower to descend in the downflow region 13.
In the case of the present embodiment, a guide vane 18 protruding toward the upward flow region 12 is provided at the end of the partition plate 4 to secure a turning radius required for inversion and to set a starting point of turning start. Upflow area 1 by the turning radius in advance
It is shifted to two sides. Therefore, as shown in the gas flow diagram of FIG. 2, the exhaust gas that changes the direction of the flow from the upflow region 12 toward the top of the tower starts turning around the tip of the guide vane 18 and follows the guide vane 18. While flowing
The gas flows into the descending flow region 13 almost uniformly over the entire width in the cross section perpendicular to the gas flow without peeling off from the partition plate 4 and without forming a vortex.

Unlike the rectification by applying pressure loss as in the case of the perforated plate 29 in the prior art, the resistance of the guide vane 18 itself is very small.
The gas flow at the tip of the partition plate 4 is rectified without increasing the pressure loss and flows into the downflow region 13.

Therefore, the gas flow is rectified in the region of the downflow region 13 where the spray header 15 is present, and it is possible to prevent the desulfurization performance from being reduced due to the drift.

Thus, according to the embodiment of the present invention,
It is not necessary to increase the circulation amount of the absorption liquid 6 and increase the power of the absorption liquid circulation pump 5 in order to maintain high desulfurization performance as in the prior art. Further, the generation of vortices on the partition plate 4 side of the descending flow region 13 is prevented, and the guide vanes 18
Therefore, the pressure loss of the absorption tower main body 1 is reduced, and the power of a desulfurization fan (not shown) can be reduced.

The embodiment shown in FIGS. 3 to 5 uses a guide vane 18 having a shape obtained by bending a plate in two stages.
This is different from the embodiment shown in FIG. The embodiment shown in FIGS. 6 to 9 is an example in which a guide vane 18 having a shape obtained by bending a plate in one step is used. The embodiment shown in FIGS. 10 to 11 is an example in which the guide vane 18 is attached to the leading end of the partition plate 4 at an angle of about 90 ° C. and 60 ° C. without bending. If the number of bending steps of the guide vane 18 is reduced, the gas flow tends to be slightly separated on the surface of the guide vane 18 and the pressure loss tends to slightly increase due to the generation of a small vortex. Thus, the same effect as in the embodiment shown in FIG. 1 can be obtained.

The embodiment shown in FIG. 12 is an example in which the number of bending steps of the guide vane 18 is made infinite, and the guide vane 18 has a semicylindrical curved surface. Since the exhaust gas flows smoothly on the surface of the guide vane 18 having a semi-cylindrical curved surface,
Peeling is least likely to occur, and the effect of reducing pressure loss is high.

The embodiment shown in FIG.
Of the guide vanes 1
This embodiment differs from the embodiment shown in FIG. 1 in that the spray direction of the absorbing liquid from the spray nozzle 16 near 8 is directed upward. Spray nozzle 16 installed upward at the top of ascending flow area 12
From above, the absorbent 6 is ejected upward, so that the absorbent always collides with the guide vane 18 located above it, and the lower surface of the guide vane 18 can always be kept wet. Therefore, the occurrence of scaling can be reliably prevented.

FIGS. 14 to 16 show another embodiment of the present invention. The embodiment shown in FIG.
Is characterized in that a perforated plate 19 is provided in the same plane as the partition plate 4 from the front end to the tower top. The aperture ratio of this perforated plate 19 is set to 70% to 30%. The perforated plate 19
Is the aperture ratio of the perforated plate 1 with respect to the entire area of the perforated plate 19.
9 is the ratio of the area of the holes drilled. Further, the region formed as the perforated plate 19 is a region where the area ratio α represented by the following equation is 22%. Area ratio α = A ′ / A = (perforated plate area) / (opening area + perforated plate area) (1) FIG. 14 shows the area A ′ and the area A in the above formula.

The perforated plate 19 can be manufactured only by forming a gas flow hole at the tip of the partition plate 4, and needs to be added to the partition plate 4 as compared with the perforated plate 29 in the prior art shown in FIG. Reinforcement may be much less.

The exhaust gas introduced from the inlet duct 2 into the absorption tower main body 1 rises in the upflow area 12 and then reverses at the top of the tower and flows into the downflow area 13. In the example of FIG. By changing the aperture ratio of the perforated plate 19, the flow velocity gradually decreases from the upper portion to the lower portion of the perforated plate 19.

FIG. 15 shows the gas flow from the top of the absorption tower to the entrance of the downflow area 13 in the absorption tower by the partition plate 4 having the perforated plate 19 of FIG. As shown in FIG. 15, since the exhaust gas has the perforated plate 19,
Downflow area 13 without separation on the downflow side of the tip
Flows almost uniformly over the entire cross-sectional direction of the flow path, and an effect of preventing drift is obtained. The drift rate and pressure loss in the present invention at this time are shown in Table 1 together with the following comparative examples.

(Comparative Example 1): When there is no drift prevention device such as a perforated plate in the flow path (Comparative Example 2): When perforated plate 29 is installed in the flow path (FIG. 1)
7)

[Table 1] In Table 1, ΔP is a pressure difference between the inlet duct 2 and the outlet duct 3, and represents a pressure loss. The drift rate is defined as follows using the flow velocity V in each element and an average value V _ave of the flow path cross section in the descending flow region 13 divided into equal cross-sectional areas. σ = {(V−V _ave ) ₂ / n} (2) Drift rate = σ / V _ave (3) where σ represents the standard deviation of the gas flow velocity, and n represents the number of elements (fixed measurement).

As can be seen from Table 1, in Comparative Example 2 which is the prior art shown in FIG. 17, the drift rate is reduced as compared with Comparative Example 1 and there is a drift preventing effect, but the pressure loss is increased compared to Comparative Example 1. are doing. On the other hand, in the present invention, the drift rate and the pressure loss were reduced, and a drift prevention effect without pressure loss was obtained.

In the embodiment having the perforated plate 19 of the present invention, the factors affecting the pressure loss and the drift rate are the area ratio α and the aperture ratio of the perforated plate 19 shown in the equation (1). If the area ratio α is in the range of 0.1 ≦ α ≦ 0.8 and the aperture ratio is between 70% and 20%, substantially the same effects as in the embodiment shown in FIG. 14 can be obtained.

The embodiment shown in FIG. 16 differs from FIG. 14 in that a guide vane 20 is provided on the downflow region 13 side of the perforated plate 19.
Is different from the embodiment shown in FIG. By forcibly descending the fluid decelerated through the perforated plate 19 by the guide vanes 20, the fluid flows into the descending flow area 13 almost uniformly, and a drift preventing effect can be obtained. Table 2 shows the pressure loss ΔP and the drift rate at this time. Pressure loss ΔP compared to Comparative Example 1 in Table 1
Is reduced, and the drift rate can be further reduced as compared with the embodiment of FIG.

[0050]

[Table 2]

[0051]

According to the present invention, gas drift in the downflow region of the two-chamber absorption tower can be prevented, so that the desulfurization performance does not decrease and the circulating pump power can be reduced. In addition, since the generation of vortices near the partition plate in the downflow region can be prevented, the pressure loss of the gas flow in the absorption tower is reduced, and the power of the desulfurization fan can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of an absorption tower according to an embodiment of the present invention, in which a guide vane is provided at a tip end of a partition plate.

FIG. 2 shows the gas flow from the top of the tower to the entrance of the downflow area when the present invention is applied.

FIG. 3 is an embodiment in the case where the shape of a guide vane provided at the tip of the partition plate shown in FIG. 1 is changed.

FIG. 4 is an embodiment in the case where the shape of a guide vane provided at the tip of the partition plate shown in FIG. 1 is changed.

FIG. 5 is an embodiment in which the shape of a guide vane provided at the tip end of the partition plate shown in FIG. 1 is changed.

FIG. 6 is an embodiment in which the shape of a guide vane provided at the tip of the partition plate shown in FIG. 1 is changed.

FIG. 7 is an embodiment in which the shape of a guide vane provided at the tip end of the partition plate shown in FIG. 1 is changed.

FIG. 8 is an embodiment in which the shape of a guide vane provided at the tip end of the partition plate shown in FIG. 1 is changed.

FIG. 9 is an embodiment in which the shape of a guide vane provided at the tip end of the partition plate shown in FIG. 1 is changed.

FIG. 10 is an embodiment in which the shape of a guide vane provided at the tip end of the partition plate shown in FIG. 1 is changed.

11 is an embodiment in the case where the shape of a guide vane provided at the tip of the partition plate shown in FIG. 1 is changed.

FIG. 12 is an embodiment in which the shape of a guide vane provided at the tip of the partition plate shown in FIG. 1 is changed.

FIG. 13 shows an embodiment in which, of the spray nozzles installed in the upflow region in the absorption tower in the embodiment of FIG. 1, the spray direction of the absorbing liquid of the spray nozzle near the guide vane is directed upward.

FIG. 14 is a side view of an absorption tower having a structure of an absorption tower according to an embodiment of the present invention, in which a partition plate has a perforated plate having a reduced opening ratio from a tower top to a bottom in an end portion. It is.

FIG. 15 shows a gas flow from the top of the tower of FIG. 14 to the entrance of the downflow area.

FIG. 16 shows another embodiment in which a guide vane is added to a perforated plate provided at the distal end of the partition plate in the embodiment of FIG.

FIG. 17 is a side view of an absorption tower in a conventional two-chamber wet-type flue gas desulfurization apparatus.

FIG. 18 shows the gas flow from the top of the prior art to the inlet of the downflow area.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Absorption tower main body 2 Inlet duct 3 Outlet duct 4 Partition plate 5 Absorbent liquid circulating pump 6 Absorbent liquid 7 Circulation tank 8 Stirrer 9 Air injection pipe 10 Mist eliminator 11 Absorbent liquid extraction pipe 12 Upflow area 13 Downflow area 14 Circulation pipe 15 Spray header 16, 17 Spray nozzle 18, 20 Guide vane 19, 29 Perforated plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hirofumi Yoshikawa 3-36 Takaracho, Kure-shi, Hiroshima Babcock Hitachi, Ltd. Inside Kure Research Laboratory (72) Naoki Oda 6-9 Takaracho, Kure-shi, Hiroshima Babcock-Hitachi, Ltd. Inside Kure Plant (72) Inventor Motoomi Iwazuki 3-36 Takaracho, Kure City, Hiroshima Prefecture Babcock Hitachi Kure Research Laboratory F Term (Reference) 4D002 AA02 AC01 BA02 CA01 DA05 DA12 4D031 AB02 AB06 AB16 EA01

Claims (8)

[Claims] An inlet duct for introducing exhaust gas discharged from a combustion device such as a boiler in a substantially horizontal direction, and an outlet duct for discharging purified exhaust gas in a substantially horizontal direction are provided.
An exhaust gas channel is provided between the inlet duct and the outlet duct,
In order to divide the exhaust gas passage into two chambers on the inlet duct side and the outlet duct side, a vertical partition plate with an opening on the ceiling side is provided, and exhaust gas introduced from the inlet duct is provided at the partition plate. After forming an upward flow region and a downward flow region in which the exhaust gas flows downward toward the outlet duct after being inverted at the opening on the ceiling side, the ejected absorbent slurry makes countercurrent contact with the exhaust gas in the upward flow region, An absorption tower for treating sulfur oxides in exhaust gas provided with spray nozzles in the respective regions so as to be in parallel contact with each other in a descending flow region; and a circulation tank for storing an absorbent slurry ejected from the spray nozzle below the absorption tower. The two-chamber wet-type flue gas desulfurization device comprising: a gas rectification means provided at a tip end of a partition plate. 2. The two-chamber wet flue gas desulfurization apparatus according to claim 1, wherein the gas rectification means is a guide vane projecting from a leading end of the partition plate toward the upward flow region. 3. The two-chamber wet drain according to claim 1, wherein the guide vane is made of a plate material bent at least one step toward the upstream side of the gas flow. Smoke desulfurization equipment. 4. The two-chamber wet flue gas desulfurization apparatus according to claim 1, wherein the tip of the guide vane is directed substantially downward. 5. The spray nozzle in the upward flow region, wherein the spray direction of the absorbing liquid of the spray nozzle near the guide vane is directed upward.
The two-chamber wet-type flue gas desulfurization device according to any one of the above. 6. The gas rectifying means is a perforated plate extending from the tip of the partition plate toward the top of the tower.
The two-chamber wet flue gas desulfurization device according to the above. 7. The two-chamber wet-type flue gas desulfurization apparatus according to claim 6, wherein the perforated plate is provided with a large number of perforations whose opening ratio is reduced from the top of the tower toward the bottom. 8. The two-chamber wet flue gas desulfurization apparatus according to claim 6, wherein a guide vane is provided on the downflow region side of the perforated plate.