WO2016186038A1 - Water quality-improving apparatus for seawater desulfurization waste water and seawater flue gas desulfurization system - Google Patents

Abstract

The present invention is a water quality-improving apparatus provided with an oxidation/aeration section 23 for performing water quality-restoring treatment, using diluting seawater 14b and air 71a, on acidic seawater desulfurization waste water 21 that is generated by seawater desulfurization of sulfur oxides in exhaust gas 12 with seawater 14 using a seawater desulfurization device 15. The water quality-improving apparatus is provided with an inlet-side diluting section 22, which: is provided on the upstream end of the oxidation/aeration section 23, supplies diluting seawater 14b, and mixes same with the seawater desulfurization waste water 21; and has at least one vortex-generating resistor 31 that is erected on the bottom surface 22a of said inlet-side diluting section 22.

Description

Seawater desulfurization drainage water quality reformer and seawater flue gas desulfurization system

TECHNICAL FIELD The present invention relates to wastewater treatment of seawater desulfurization equipment applied to power plants such as coal fired, crude oil fired, and heavy oil fired, and in particular, seawater desulfurization wastewater (wastewater) of seawater desulfurization equipment desulfurized using the seawater method. TECHNICAL FIELD The present invention relates to a seawater desulfurization drainage water quality reformer and a seawater flue gas desulfurization system for reforming water quality.

Conventionally, in a power plant using coal, crude oil or the like as fuel, combustion exhaust gas (hereinafter referred to as “exhaust gas”) discharged from a boiler is sulfur such as sulfur dioxide (SO ₂ ) contained in the exhaust gas. The oxide (SOx) is removed and then released to the atmosphere. As a desulfurization method of a desulfurization apparatus that performs such a desulfurization treatment, a lime gypsum method, a spray dryer method, a seawater method, and the like are known.

Among these, the seawater desulfurization apparatus that employs the seawater method is a desulfurization system that uses seawater as an absorbent. In this system, for example, by supplying seawater and boiler exhaust gas into a desulfurization tower (absorption tower) having a cylindrical shape or a rectangular shape such as a substantially cylindrical shape, the seawater is used as an absorbing liquid to make a wet-based gas-liquid contact. Is generated to remove sulfur oxides.
The desulfurized seawater desulfurization effluent used as an absorbent in the desulfurization tower described above is, for example, a water channel when drained by flowing through a long channel (Seawater Oxidation Treatment System; SOTS) having a wide channel width and an open top. In a water quality reformer (oxidation / aeration unit) equipped with an aeration device installed on a part of the bottom of the gas, decarboxylation (explosion) is caused by aeration that causes fine bubbles to flow out (Patent Documents 1 to 3).

JP 2006-055779 A JP 2009-028570 A JP 2009-028572 A

However, the used seawater desulfurization wastewater from the desulfurization tower using seawater is supplied with dilution seawater before being introduced into the water quality reformer, so that it can be easily reacted with the seawater desulfurization wastewater. However, there is a problem that the liquid-liquid mixing of the two is incomplete.

Especially, in the case of the reforming treatment with a water quality reformer having a long water channel structure, good mixing at the water channel inlet is required, and countermeasures are desired.

In addition, since a huge amount of seawater is required for water quality reforming of seawater desulfurization wastewater, there is a problem that installation of, for example, a stirrer as a general stirring means leads to a significant increase in power.
In addition, when used desulfurization waste water and diluted waste water for diluting it are introduced from two directions, for example, when mixed in a cross flow, etc., measures are taken to sufficiently mix the flows from these two directions. Is desired.

Therefore, for example, the advent of a water quality reforming technique that performs good liquid-liquid mixing without installing a stirrer or the like is eagerly desired.

In view of the above problems, an object of the present invention is to provide a seawater desulfurization drainage water quality reformer and a seawater flue gas desulfurization system that can satisfactorily perform liquid-liquid mixing without using a stirrer or the like.

The first invention of the present invention for solving the above-described problem is that an acidic seawater desulfurization wastewater generated by seawater desulfurization of sulfur oxides in exhaust gas with seawater by a seawater desulfurization device is diluted with seawater and air. A water quality reformer having an oxidation / aeration unit for performing water quality recovery processing, provided on the upstream side of the oxidation / aeration unit, supplying the diluted seawater and mixing it with seawater desulfurization effluent And having at least one or more vortex generating resistors in the inlet side dilution section.

According to a second invention, in the first invention, the drainage supply passage for introducing seawater desulfurization drainage into the inlet side dilution section introduces the seawater desulfurization drainage from a direction orthogonal to the seawater flow direction of the diluted seawater. It is in the water quality reformer of the seawater desulfurization drainage that is the feature

According to a third invention, in the first invention, a drainage supply path for introducing the seawater desulfurization drainage into the inlet side dilution section is arranged in a direction perpendicular to the seawater flow direction of the diluted seawater, and the drainage supply path The seawater desulfurization drainage water quality reforming apparatus is characterized in that the vortex generating resistor is disposed at a position facing a hole for supplying the seawater desulfurization drainage.

According to a fourth invention, in any one of the first to third inventions, diluted seawater is further supplied and mixed with water quality-recovered seawater which is provided on the downstream side of the oxidation / aeration section and whose water quality has been improved. A water quality reformer for seawater desulfurization drainage, comprising an outlet side dilution section, and having at least one vortex generating resistor in the outlet side dilution section.

A fifth invention is the water quality reformer for seawater desulfurization drainage according to any one of the first to fourth inventions, wherein the vortex generating resistor is a columnar body.

The sixth invention is the water quality reformer for seawater desulfurization drainage according to the fifth invention, wherein the columnar body has a protrusion around the columnar body.

According to a seventh aspect of the present invention, there is provided the water quality reformer for seawater desulfurization waste water according to any one of the first to sixth aspects, wherein the vortex generating resistor includes a rotor blade.

An eighth aspect of the invention is the water quality improvement of seawater desulfurization drainage according to the seventh aspect of the invention, wherein the vortex generating resistors having the rotor blades are arranged in parallel along the seawater flow direction. In the device.

A ninth invention is the water quality reformer for seawater desulfurization drainage according to any one of the first to eighth inventions, wherein the vortex generating resistors are arranged in a staggered state.

According to a tenth aspect of the invention, there is provided a seawater desulfurization device that makes a gas-liquid contact between exhaust gas and seawater and a desulfurization reaction; A seawater flue gas desulfurization system, comprising:

According to the present invention, since it has at least one resistor for vortex generation standing from the bottom surface of the inlet side dilution section, liquid-liquid mixing of seawater desulfurization drainage and diluted seawater proceeds, and the well-mixed dilution Mixed seawater can be produced.

FIG. 1 is a schematic diagram of a seawater flue gas desulfurization system including a water quality reformer for seawater desulfurization drainage according to a first embodiment. FIG. 2 is a schematic plan view of the main part of FIG. FIG. 3 is a schematic diagram of a water quality reformer for seawater desulfurization wastewater according to the first embodiment. FIG. 4A is a cross-sectional view of a vortex generating resistor. FIG. 4B is a cross-sectional view of a vortex generating resistor. FIG. 4C is a cross-sectional view of a vortex generating resistor. FIG. 4D is a cross-sectional view of a vortex generating resistor. FIG. 4E is a cross-sectional view of a vortex generating resistor. FIG. 4F is a cross-sectional view of a vortex generating resistor. FIG. 4G is a cross-sectional view of a vortex generating resistor. FIG. 5 is a perspective view of another vortex generating resistor according to this embodiment. FIG. 6 is a schematic diagram of another seawater desulfurization drainage water quality reforming apparatus according to the first embodiment. FIG. 7 is a schematic diagram of another seawater desulfurization drainage water quality reforming apparatus according to the first embodiment. FIG. 8A is a diagram in which vortex generating resistors are arranged in the same row in the flow direction. FIG. 8B is a diagram in which vortex generating resistors are arranged in the same row in the flow direction. FIG. 8C is a diagram in which vortex generating resistors are arranged in the same row in the flow direction. FIG. 8D is a diagram in which vortex generating resistors are arranged in a staggered arrangement. FIG. 9 is a perspective view of a structure in which resistors for generating vortices are combined. FIG. 10 is a schematic view of another seawater desulfurization drainage water quality reforming apparatus according to the first embodiment. FIG. 11 is a schematic view of another water quality reformer for seawater desulfurization drainage according to the first embodiment. FIG. 12 is a schematic diagram of a water quality reformer for seawater desulfurization drainage according to a second embodiment. FIG. 13 is a schematic diagram of another seawater desulfurization drainage water quality reforming apparatus according to the second embodiment. FIG. 14 is a schematic diagram of another seawater desulfurization drainage water quality reforming apparatus according to the second embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

FIG. 1 is a schematic diagram of a seawater flue gas desulfurization system including a water quality reformer for seawater desulfurization drainage according to a first embodiment. FIG. 2 is a schematic plan view of the main part of FIG. FIG. 3 is a schematic diagram of a water quality reformer for seawater desulfurization wastewater according to the first embodiment. 4A to 4G are cross-sectional views of a vortex generating resistor. FIG. 5 is a perspective view of another vortex generating resistor according to this embodiment. 6 and 7 are schematic views of a water quality reforming apparatus for other seawater desulfurization drainage according to the first embodiment. 8A to 8C are diagrams in which resistors for generating vortices are arranged in the same row in the flow direction. FIG. 8D is a diagram in which vortex generating resistors are arranged in a staggered arrangement.
As shown in FIGS. 1 and 2, the seawater flue gas desulfurization system 10 according to the present embodiment is configured to remove dust from the exhaust gas 12 from the boiler 11 and the sulfur oxide in the exhaust gas 12 after removing dust from seawater. 14, a seawater desulfurization device 15 having an absorption tower 15 a that is desulfurized by 14, and a water quality reforming device 20 that reforms seawater desulfurization drainage (drained seawater) 21 from the seawater desulfurization device 15.

The absorption tower 15a seawater desulfurization unit 15 supplies the seawater 14 seawater supply line (seawater passage) the tip of the L ₁₁ is connected to a portion 14a of the supplied sea water 14, ejection portion 15b in the apparatus main body It supplied by seawater inlet line L ₁₂ in. The ejection part 15b ejects the supplied seawater 14a upward by a liquid column system. The seawater that is ejected and falls contacts the exhaust gas 12 that is introduced.

In the absorption tower 15a, the seawater desulfurization wastewater 21 containing sulfurous acid (H ₂ SO ₃ ) is generated by desulfurizing the sulfur oxide in the exhaust gas 12 by opposing contact with the seawater from which the sulfur oxide is jetted. That is, in the absorption tower 15a, the sulfur oxide in the exhaust gas 12 is absorbed by the reaction represented by the following formula (I), and the seawater desulfurization containing sulfite ions (HSO ₃ ⁻ ) and hydrogen ions (H ⁺ ). Drainage 21 is generated.
SO ₂ (G) + H ₂ O → H ₂ SO ₃ (L) → HSO ₃ ⁻ + H ⁺ (I)
The purified purified gas 12A is discharged from the chimney 61 to the outside.

The seawater desulfurization drainage 21 is drained by a seawater desulfurization drainage line L ₁₃ connected to the water quality reformer 20 from the bottom side of the absorption tower 15a.

As shown in FIGS. 1 and 2, the water quality reforming apparatus 20 according to the present embodiment is an acidic seawater desulfurization wastewater 21 generated by desulfurizing sulfur oxides in the exhaust gas 12 with seawater 14 using an absorption tower 15 a. Is a water quality reformer equipped with an oxidation / aeration unit 23 for performing water quality recovery treatment with diluted seawater 14b and air 71a, and is provided on the upstream side of the oxidation / aeration unit 23 to supply the diluted seawater 14b. The inlet side dilution part 22 mixed with the seawater desulfurization waste water 21 is provided, and has at least one or more vortex generating resistors 31 standing from the bottom surface 22a of the inlet side dilution part 22.

Here, the vortex generating resistor 31 according to the present embodiment is a columnar body and is erected from the bottom surface 22 a of the inlet side dilution section 22.

In the present embodiment, the water quality reformer 20 has a long water channel structure in which a rectangular upper portion surrounded by the long side walls 20a and 20b and the short side walls 20c and 20d is opened, Seawater moves from upstream to downstream in the longitudinal direction from the short side wall 20c toward the right side wall 20d, and a reforming process is performed.

Here, the length L ₁ of the inlet side dilution unit 22 is, for example, 5 m to 10 m, the length L ₂ of the oxidation / aeration unit 23 is 50 m to 200 m, and the length L ₃ of the outlet side dilution unit 24 is 5 m to 10 m. . The width W is a kind of large-scale seawater canal structure of 20 to 50 m. In the case of such a long canal structure, in the past, for example, a stirring operation or the like was necessary for sufficient liquid-liquid mixing. However, in this embodiment, a plurality of small resistors are installed at the position mouth portion so Sufficient liquid-liquid mixing is possible only by generating a stirring vortex such as a vortex. The diameter of the eddy-generating resistor 31 installed in this flow path is, for example, 10 cm to 100 cm.

The inlet side dilution part 22 is an area | region which dilutes the seawater desulfurization waste_water | drain 21 with the diluted seawater 14b to supply. Seawater from seawater supply line L ₁₁ supplies the seawater 14 is supplied to the inlet side dilution unit 22 as a diluent seawater 14b. The seawater desulfurization waste water 21 and the diluted seawater 14b are mixed in the inlet side dilution section 22 to generate diluted mixed seawater 25.
In the present embodiment, the seawater desulfurization wastewater 21 is discharged from the absorption tower 15a of the seawater desulfurization device 15 installed separately from the water quality reformer 20, and the wastewater provided on the side wall 20a of the inlet side dilution unit 22. It is introduced inside by a supply path 41.

The oxidation / aeration unit 23 is an area where water quality recovery processing is performed by reforming the water quality of the diluted mixed seawater 25 with the air 71 a introduced from the outside by the blower 71.
Here, the air 71 a is supplied to the air diffusion pipe 73 via the air introduction pipe 72, and the air 71 a is introduced into the oxidation / aeration unit 23 from the aeration nozzle 74 provided in the air diffusion pipe 73.

The outlet side dilution unit 24 is an area for supplying diluted seawater as needed before being discharged as discharged seawater 27 to the water quality modified seawater 26 that has been subjected to water quality modification.

Here, the vortex generating resistor 31 installed in the inlet side dilution section 22 is a columnar body, and is erected in the width direction from the bottom surface 22 a of the inlet side dilution section 22.

In this embodiment, the seawater desulfurization waste water 21 is introduced into the inside by a waste water supply path 41 provided on the side wall 20a of the inlet side dilution section 22. When the seawater desulfurization waste water 21 is introduced into the inlet side dilution part 22 from the side wall 20a side, a flow distribution in the width (W) direction is formed. According to the present embodiment, when the eddy-generating resistor 31 is installed at a predetermined interval, when the diluted seawater 14b and the seawater desulfurization drainage 21 are mixed, not simple liquid-liquid mixing but vortex generation. Due to the generation of a stirring vortex or the like by the resistor 31, liquid-liquid mixing proceeds and becomes a sufficiently mixed diluted mixed seawater 25 in a direction perpendicular to the width (W) direction (seawater flow direction). It is trying to become the flow of. As a result, when the seawater desulfurization waste water 21 is introduced from a direction orthogonal to the diluted seawater 14b, a flow distribution in the width (W) direction is formed. When both of them collide with each other, the generation of a stirring vortex is promoted and liquid-liquid mixing is promoted.

Next, an example in which a vortex generating resistor 31 is installed in the water quality reformer 20 for seawater desulfurization wastewater according to this embodiment will be described. In the water quality reforming apparatus 20A for seawater desulfurization drainage shown in FIG. 3, the seawater desulfurization drainage 21 is directly introduced from the lateral direction through the opening 41a of the drainage supply path 41 provided in the side wall 20a inside the inlet side dilution section 22. It is. In the case of the water quality reforming apparatus 20A for seawater desulfurization wastewater shown in FIG. 3, the seawater desulfurization wastewater 21 is discharged toward the side wall 20b facing the opening 41a. The vortex generating resistor 31 is arranged in the mixing region. In this embodiment, the number of eddy-generating resistors 31 is reduced on the inlet side of the diluted seawater 14b of the inlet-side dilution unit 22, and the vortex generating resistor 31 is installed on the oxidation / aeration unit 23 side. The number of installations is increased. Here, the position and number of the eddy-generating resistors 31 may be changed for each plant, and appropriately changed depending on the drainage speed and flow of both.

According to the present embodiment, by arranging the vortex generating resistor 31 in a predetermined manner, when the diluted seawater 14b and the seawater desulfurization drainage 21 are mixed, the vortex generating resistor 31 is not a simple liquid-liquid mixing. As the flow direction changes, vortices and the like are generated, and liquid-liquid mixing proceeds. As a result, when the seawater desulfurization waste water 21 is introduced from a direction orthogonal to the diluted seawater 14b, a flow distribution in the width (W) direction is formed. When both 31 collide by installing 31, a stirring vortex such as a Karman vortex is generated, and liquid-liquid mixing is promoted.

The cross-sectional shape of the vortex generating resistor 31 is, for example, a circle, a semicircle, a semicircle having a concave portion, a rectangle, an inverted trapezoid, etc. Any method may be used as long as a stirring vortex such as a Karman vortex is formed on the downstream side in the traveling direction.

4A to 4G are sectional views of a vortex generating resistor and an example of vortex generation.
FIG. 4A shows a resistor 31A for generating a vortex having a circular cross section. As shown to FIG. 4A, the stirring vortex 32 is formed in the seawater flow downstream side of the resistor 31A. Further, a stagnation region 33 of the flow is formed on the downstream side (back side) of the resistor 31A, and the generation of the stirring vortex 32 proceeds in the stagnation region 33 and the liquid-liquid mixing is promoted. By mixing the seawater desulfurization waste water 21 and the diluted seawater 14b well promoted by the generated stirring vortex 32, the liquid-liquid mixing of both the seawater desulfurization wastewater 21 and the diluted seawater 14b progressed and mixed well. The diluted mixed seawater 25 can be generated.
In addition, generation | occurrence | production of the stirring vortex 32, such as a Karman vortex, is generated over the entire resistor on the downstream side in the flow direction of the resistor, and the stirring vortex in the figure is an example schematically described. Also, the size of the stirring vortex changes depending on the flow rate of the seawater, and is not limited to the figure.

The following shows another example of a vortex generating resistor whose cross section is not circular. Similar to the resistor 31A shown in FIG. 4A, the vortex generation location, size range, and the like vary depending on the flow rate of the seawater, so the following drawings are examples thereof and are not limited thereto.
FIG. 4B shows a vortex generating resistor 31B having a rectangular cross section. As shown in FIG. 4B, a stirring vortex 32 is formed on the downstream side (back side) of the resistor 31B in the seawater flow. Further, a stagnation region 33 of the flow is formed on the downstream side (back side) of the resistor 31B, and the generation of the stirring vortex 32 proceeds in the stagnation region 33 and the liquid-liquid mixing is promoted.

FIG. 4C shows a semicircular vortex generating resistor 31C whose cross-sectional shape has an arc on the upstream side. As shown in FIG. 4C, a stirring vortex 32 is formed on the downstream side (back side) of the resistor 31 </ b> C in the seawater flow. Further, a stagnation region 33 of the flow is formed on the downstream side (rear side) of the resistor 31C, and the generation of the stirring vortex 32 proceeds in the stagnation region 33 and the liquid-liquid mixing is promoted.

FIG. 4D shows a resistor 31D for generating a vortex with a cross-sectional shape having a square shape with the upstream side at the top. As shown in FIG. 4D, a stirring vortex 32 is formed on the downstream side (back side) of the resistor 31D. Further, a stagnation region 33 of the flow is formed on the downstream side (rear side) of the resistor 31D, and the generation of the stirring vortex 32 proceeds in the stagnation region 33 and the liquid-liquid mixing is promoted.

FIG. 4E shows a triangular vortex generating resistor 31E whose cross-sectional shape has an upstream apex. As shown to FIG. 4E, the stirring vortex 32 is formed in the seawater flow downstream side (back side) of the resistor 31E. Further, a stagnation region 33 of the flow is formed on the downstream side (back side) of the resistor 31E, and the generation of the stirring vortex 32 proceeds in the stagnation region 33 and the liquid-liquid mixing is promoted.

FIG. 4F shows a semicircular vortex generating resistor 31F having an arcuate recess 31a whose cross-sectional shape faces the upstream side. As shown in FIG. 4F, a small vortex is generated in the arc-shaped recess 31a on the upstream side of the resistor 31F and becomes a seed of the vortex, and the seed of this vortex passes through the side surface of the resistor 31F, and the seawater flow A stirring vortex 32 is formed on the wake side (back side). Further, a stagnation region 33 of the flow is formed on the downstream side (back side) of the resistor 31F, and the generation of the stirring vortex 32 proceeds in the stagnation region 33 and the liquid-liquid mixing is promoted.

FIG. 4G shows a semicircular vortex generating resistor 31G having an arc-shaped recess 31a whose cross-sectional shape faces the side wall. As shown in FIG. 4G, a stirring vortex 32 is generated in the arc-shaped recess 31a on the upstream side of the resistor 31G and becomes a seed of the vortex, and this vortex seed passes through the side surface of the resistor 31G, A stirring vortex 32 is formed on the downstream side (back side) of the flow. Further, a stagnation region 33 of the flow is formed on the downstream side (back side) of the resistor 31G, and the generation of the stirring vortex 32 proceeds in the stagnation region 33 and the liquid-liquid mixing is promoted.

Further, the semicircular vortex generating resistor 31G having the arc-shaped recess 31a is installed on the bottom surface 22a of the inlet side dilution unit 22 so that the arc-shaped recess 31a faces the sea surface side orthogonal to the seawater flow. You can also.

According to this embodiment, since at least one vortex generating resistor 31 is provided standing from the bottom surface 22a of the inlet side dilution section 22, liquid-liquid mixing of the seawater desulfurization drainage 21 and the diluted seawater 14b proceeds. The well-mixed diluted mixed seawater 25 can be generated. Since the mixing is promoted by installing only the eddy-generating resistor 31, it is unnecessary to install, for example, a stirrer, which is a general stirring means, and power is not required.

FIG. 5 is a perspective view of another vortex generating resistor according to this embodiment. As shown in FIG. 5, a spiral projection 34 is provided around the vortex generating resistor 31A. By providing the projections 34, the generation of the stirring vortex 32 becomes irregular in the vertical direction, for example, and the stirring vortex 32 that is regularly generated promotes the stirring by the movement of the vertical vortex of the resistor 31A or the like. it can.

An example of installing the eddy-generating resistor 31 according to the present embodiment will be further described with reference to FIGS.
As shown in FIG. 6, the seawater desulfurization drainage water quality reformer 20 </ b> B according to the present embodiment is an acidic seawater generated by the seawater desulfurization device 15 desulfurizing sulfur oxide in the exhaust gas 12 with the seawater 14. The desulfurization waste water 21 is a water quality reformer provided with an oxidation / aeration unit 23 for performing water quality recovery treatment with diluted seawater 14b and air 71a, and is provided on the upstream side of the oxidation / aeration unit 23. The inlet side dilution part 22 which supplies and mixes with the seawater desulfurization waste_water | drain 21 is provided, and it has the resistor 31 for at least 1 or more eddy generation standing from the bottom face 22a of this inlet side dilution part 22. FIG.

Here, the supply method of the seawater desulfurization drainage 21 from the lateral direction to the inlet side dilution section 22 is directly performed from the opening 41a provided in the side wall 20a of the inlet side dilution section 22, as shown in FIG. 6 and 7, there is a case where the seawater desulfurization waste water 21 is supplied to the inlet side dilution section 22 through the drain supply path 41 as shown in FIGS.

In the embodiment shown in FIG. 6, diluted seawater 14 b is introduced into the inlet side dilution part 22 from the side wall 20 c and flows in the longitudinal direction of the inlet side dilution part 22. And the seawater desulfurization waste_water | drain 21 is discharged | emitted from the hole 42 while inserting the waste_water | drain supply path 41 from the side wall 20a in the direction orthogonal to the flow direction of the diluted seawater 14b.

In this embodiment, the vortex generating resistor 31 is arranged at a position facing the hole 42 of the drainage supply passage 41 with a predetermined interval.
The first row of vortex generating resistors 31 are arranged at a predetermined interval so as to face the odd-numbered holes 42 from the inlet side of the drainage supply passage 41. Further, the vortex generating resistors 31 in the second row are arranged at a predetermined interval so as to face the even-numbered holes 42 from the inlet side of the drainage supply passage 41.

That is, the second row vortex generating resistors 31 are alternately arranged in a staggered state at a position half the pitch of the first row vortex generating resistors 31.

Further, in the seawater desulfurization drainage water quality reformer 20B shown in FIG. 7, a plurality of vortex generating resistors 31 are further added along the seawater flow direction. The third column and the fourth column are arranged in a staggered arrangement. By adding this row, the stirring vortex is further increased, and the diluted mixed seawater 25 with good dilution and mixing can be obtained. In addition, the addition of a row | line | column is suitably changed in consideration of the magnitude | size of the entrance side dilution part 22, and a mixing degree. As for the degree of mixing, the number of stages of the eddy-generating resistor 31 is derived from the following relational expression (1), for example.

Here, the flow rate of the diluted seawater 14b in the dilution section is, for example, 0.5 to 2.0 m / second, and the flow rate of the seawater desulfurization drainage 21 is, for example, 0.5 to 20 m / second. The diameter of the eddy generating resistor 31 is, for example, 10 cm to 100 cm.

FIGS. 8A to 8D show a case where they are installed in the same row arrangement and a staggered arrangement in this embodiment. 8A to 8C are diagrams in which the vortex generating resistors 31 are arranged in the same row in the flow direction, and FIG. 8D is a diagram in which the vortex generating resistors are arranged in a staggered arrangement. In addition, the wavy line in a figure shows a stirring vortex typically.
As shown in FIG. 8A, the first row of vortex generating resistors 31-1 and the second row of vortex generating resistors 31-2 are arranged in the same direction in the flow direction so that the stirring vortex If the generation is good, the mixed state will persist.

As shown in FIG. 8B, for example, when the flow velocity of the diluted seawater 14b decreases (flow velocity: small), the vortex generated by the first row vortex generating resistor 31-1 is the second row vortex. It is interfered and attenuated by the generating resistor 31-2. Thereby, a mixed state may fall. Moreover, as shown in FIG. 8C, when the flow rate of the diluted seawater 14b increases (flow rate: large), the vortex may become extremely large.

In such a case, as shown in FIG. 8D, the vortex generating resistors 31-1 and 31-2 are arranged in a staggered arrangement so that the first row vortex generating resistors 31- The vortex generated in 1 is not attenuated by the vortex generating resistor 31-2 in the second row, and the mixed state of the diluted mixed seawater can be maintained.

Also, the mixing efficiency of the liquid-liquid mixing can be increased by increasing the diameter of the vortex generating resistor 31-2 in the second row of the staggered arrangement and increasing the generated stirring vortex. Note that these arrangements can be appropriately changed according to the inflow state of the diluted seawater and the desulfurized waste water before the maintenance of the periodic inspection.

FIG. 9 is a perspective view of a structure in which resistors for generating vortices are combined. As shown in FIG. 9, the vortex generating resistor 31 is combined by support members 35 and 36 to form a so-called jungle gym structure. By using such a jungle gym structure, in addition to the generation of vortices in the direction along the seawater flow (lateral direction), the generation of vortices in the vertical direction (longitudinal direction) can be combined. Efficiency increases.

Also, it is not necessary to install the vortex generating resistors 31 one by one on the bottom surface 22a, and it becomes easy to install them as necessary at a location optimal for mixing.

Next, operation | movement of the seawater flue gas desulfurization system 10 in a present Example is demonstrated, referring FIG.1 and FIG.2.
First, the dust from the exhaust gas from the boiler 11 is removed by the dust removing device 13. Exhaust gas after dust removal is introduced into the absorption tower 15a seawater desulfurization unit 15 via a pump P, wherein contact seawater 14 and gas-liquid supplied to the desulfurization reaction of SO ₂ to sulfurous acid (H ₂ SO ₃₎ Then, it is purified to a purified gas 12A. Seawater desulfurization wastewater 21 that is used seawater containing sulfur is introduced into the inlet side dilution section 22 of the water quality reformer 20 of the seawater desulfurization wastewater 21.
In the present embodiment, the seawater desulfurization drainage 21 is introduced through the hole 42 of the drainage supply path 41. On the other hand, since the seawater supply line L ₁₁ from the diluting seawater 14b is supplied to the inlet side dilution unit 22, the seawater desulfurization effluent 21 is diluted mixture.

At the time of this dilution and mixing, the vortex generating resistors 31 are arranged at a predetermined interval. Therefore, when the seawater 14 passes next to the vortex generating resistors 31, a stirring vortex is generated and diluted. -It becomes diluted mixed seawater 25 with good mixing.

By diluting the seawater desulfurization waste water 21 having a low pH with the unused diluted seawater 14b, the pH of the treated seawater at the time of treatment in the oxidation / aeration unit 23 can be shifted to the neutral side. In the present embodiment, for example, the seawater desulfurization effluent 21 having a pH of about 2 to 6 can be converted to a diluted mixed seawater 25 having a pH of about 3 to 7, for example, but the pH is not limited thereto.

The diluted mixed seawater 25 that has been successfully diluted and mixed is introduced into the oxidation / aeration unit 23 having an air diffuser 73 that is provided on the downstream side of the inlet side dilution unit 22 and performs a water quality recovery process. Then, the air 71a supplied from an aeration air blower (not shown) is supplied by the aeration nozzle 74 of the diffuser pipe 73, the water quality is recovered, and the water quality modified seawater 26 is obtained.

Here, in the oxidation / aeration unit 23, reactions represented by the formulas (II) and (III) occur.
HSO ₃ ⁻ + 1 / 2O ₂ → SO ₄ ² + H ⁺ (II)
HCO ₃ ⁻ + H ⁺ → CO ₂ + H ₂ O (III)

Thus, the sulfite ions (HSO ₃ ⁻ ) generated by the reaction in the seawater desulfurization device 15 become soluble sulfate (SO ₄ ²⁻ ) in the oxidation / aeration unit 23 and are released into the seawater. On the other hand, hydrogen ions generated by the oxidation reaction of sulfite ions react with carbonate ions (HCO ₃ ⁻ ) in seawater and are released out of the system as carbon dioxide and water. That is, oxidation and decarboxylation reactions occur in the oxidation / aeration unit 23.

The water quality-modified seawater 26 that has undergone water quality improvement is further supplied with diluted seawater 14b as necessary at the outlet side dilution section 24, diluted, and discharged as discharged seawater 27 suitable for discharge.

FIG. 10 is a schematic view of another seawater desulfurization drainage water quality reforming apparatus according to the first embodiment. The seawater desulfurization drainage water quality reforming apparatus 20D shown in FIG. 10 further includes a discharge adjusting unit 29 on the downstream side of the outlet side dilution unit 24, and a vortex in the outlet side dilution unit 24 and the discharge adjustment unit 29. Each of the generating resistors 31 is arranged. Thereby, liquid-liquid mixing can be made favorable not only on the inlet side but also on the outlet side.

FIG. 11 is a schematic view of another water quality reformer for seawater desulfurization drainage according to the first embodiment. The seawater desulfurization drainage water quality reformer 20E shown in FIG. 11 is provided with a diluted seawater introduction section 19 for introducing the diluted seawater 14b upstream of the inlet side dilution section 22, and the seawater desulfurization drainage water quality reformer 20E. A partition wall 20e is provided along the longitudinal direction to form a main channel and a sub channel. Then, a part of the diluted seawater 14b introduced into the diluted seawater introduction portion 19 is bypassed and flows into the outlet side dilution portion 24 as the diluted seawater 14b via the sub-flow channel formed by the partition wall 20e. Yes.
A vortex generating resistor 31 is disposed in a mixed region of the diluted seawater 14 b introduced by bypass into the outlet side dilution section 24 and the water-modified seawater 26. Thereby, also in the exit side dilution part 24, liquid-liquid mixing becomes favorable with the resistor 31 for vortex generation.

FIG. 12 is a schematic diagram of a water quality reformer for seawater desulfurization drainage according to the second embodiment. In addition, the same code | symbol is attached | subjected to the member same as the structural member of the water quality reformer of the seawater desulfurization waste water of Example 1, and the description is abbreviate | omitted.

As shown in FIG. 12, in the seawater desulfurization water quality reformer 20F according to the second embodiment, the vortex generating resistors 51 including the rotary blades 52 are arranged in parallel along the seawater flow direction. . Thus, by using the vortex generating resistor 51 provided with the rotary blade 52, the vortex generating efficiency is improved.

Further, the rotation direction of the rotary blades 52 may be the same in the front row side and the rear row side, or the rotation directions of the rotary blades 52 on the front row side and the rear row side may be opposite rotations. The degree of mixing can be increased or decreased by a combination of the rotational directions of the front and rear rotor blades. Furthermore, by changing the pitch and the angle of the rotary blade 52, the vortex generated in the front row can be diffused around.

FIG. 13 is a schematic view of another seawater desulfurization drainage water quality reforming apparatus according to the second embodiment. The seawater desulfurization drainage water quality reformer 20G shown in FIG. 13 uses the vortex generating resistor 31 of Example 1 and the vortex generating resistor 51 including the rotor blades 52 in combination, and the inlet side dilution unit 22 is used. Two rows of eddy-generating resistors 31 are arranged on the front row side, and two rows of vortex-generating resistors 51 having rotor blades 52 are arranged on the rear row side. As described above, the vortex generating resistors 51 provided with the rotor blades 52 are arranged in two rows to further improve the vortex generating efficiency.

FIG. 14 is a schematic view of another seawater desulfurization drainage water quality reforming apparatus according to the second embodiment. The seawater desulfurization drainage water quality reformer 20H shown in FIG. 14 has two vortex generating resistors 31 arranged on the front row side of the inlet side dilution section 22, and a vortex having rotor blades 52a and 52b on the rear row side. The generating resistors 51 are arranged in two rows, and the diameter of the downstream rotor blade 52b is larger than that of the upstream rotor blade 52a. Thus, by making the downstream rotor blade 52b larger than the diameter of the upstream rotor blade 52a, the vortex spreads more widely, so that the mixing efficiency can be further improved.

DESCRIPTION OF SYMBOLS 10 Seawater flue gas desulfurization system 11 Boiler 12 Exhaust gas 13 Dust removal apparatus 14 Seawater 15 Seawater desulfurization apparatus 15a Absorption tower 20, 20A-20H Water quality reforming apparatus of seawater desulfurization drainage 21 Seawater desulfurization drainage 22 Inlet side dilution part 23 Oxidation / aeration part 24 Outlet side dilution unit 25 Diluted mixed seawater 26 Water-modified seawater 27 Discharged seawater 31, 51 Resistor for generating vortex 32 Stirring vortex 52, 52a, 52b Rotor blade

Claims (10)

A water quality reformer equipped with an oxidation / aeration unit that performs water quality recovery treatment with diluted seawater and air from acidic seawater desulfurization wastewater generated by seawater desulfurization of sulfur oxides in exhaust gas with seawater. There,
Provided on the upstream side of the oxidation / aeration unit, provided with an inlet side dilution unit for supplying the diluted seawater and mixing it with seawater desulfurization drainage,
A water quality reformer for seawater desulfurization drainage, wherein the inlet side dilution section has at least one vortex generating resistor. In claim 1,
A water quality reformer for seawater desulfurization wastewater, wherein the drainage supply passage for introducing seawater desulfurization wastewater into the inlet side dilution section introduces the seawater desulfurization wastewater from a direction orthogonal to the seawater flow direction of the diluted seawater. In claim 1,
A drainage supply path for introducing the seawater desulfurization drainage into the inlet side dilution section is arranged in a direction orthogonal to the seawater flow direction of the diluted seawater,
A water quality reforming apparatus for seawater desulfurization drainage, wherein the vortex generating resistor is disposed at a position facing a hole for supplying the seawater desulfurization drainage from the drainage supply path. In any one of Claims 1 thru | or 3,
Provided on the downstream side of the oxidation / aeration unit, and further comprising an outlet side dilution unit for supplying and mixing diluted seawater to water quality-recovered seawater with improved water quality,
A water quality reformer for seawater desulfurization drainage, comprising at least one vortex generating resistor in the outlet side dilution section. In any one of Claims 1 thru | or 4,
The water quality reformer for seawater desulfurization drainage, wherein the vortex generating resistor is a columnar body. In claim 5,
A water quality reformer for seawater desulfurization drainage characterized by having protrusions around the columnar body. In any one of Claims 1 thru | or 6,
The water quality reformer for seawater desulfurization drainage, wherein the vortex generating resistor includes a rotor blade. In claim 7,
A water quality reformer for seawater desulfurization drainage, wherein the vortex generating resistors having the rotor blades are arranged in parallel along the seawater flow direction. In any one of Claims 1 to 8,
A water quality reformer for seawater desulfurization drainage, wherein the vortex generating resistors are arranged in a zigzag state. A seawater desulfurization device that makes a gas-liquid contact between the exhaust gas and seawater for a desulfurization reaction, and a seawater desulfurization wastewater from the seawater desulfurization device that reforms the seawater desulfurization wastewater according to any one of claims 1 to 9, And a seawater flue gas desulfurization system.

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