JP5951291B2 - Exhaust gas treatment equipment - Google Patents

Description

The present invention relates to an exhaust gas treatment apparatus such as a boiler plant for thermal power generation, and in particular, a wet flue gas desulfurization apparatus (or desulfurization apparatus) that removes sulfur oxide (SO ₂ ) and mercury (Hg) contained in combustion exhaust gas. The present invention relates to an exhaust gas treatment apparatus including

An example of a boiler plant for thermal power generation that burns coal is shown in FIG. The boiler plant for thermal power generation mainly includes a boiler 13, a denitration device 14, an A / H 15, a dust collection device 16, and a desulfurization device 3. The boiler 13 emits exhaust gas by burning the coal 25. The denitration device 14 decomposes NOx (nitrogen oxides) contained in the gas discharged from the boiler. The A / H 15 adjusts the temperature of the gas discharged from the denitration device 14 to 200 to 160 ° C., and the dust collector 16 removes the dust. The dust-removed gas is supplied to the desulfurization apparatus 3 and then SO ₂ is removed and discharged from the chimney 29.

FIG. 9 shows the configuration of the prior art desulfurization apparatus 3. The desulfurization apparatus 3 mainly includes a spray nozzle 4, an absorbing liquid circulation pump 5, a mist eliminator 8, an oxidizing gas supply unit 9, a stirrer 10, an absorbing liquid reservoir 11, and the like. The absorbing liquid 6 sprayed from the spray nozzle 4 is brought into contact with the exhaust gas, so that SO _{2 in} the exhaust gas is removed. The absorbed SO ₂ becomes sulfurous acid, and when the concentration of sulfurous acid increases, the SO ₂ absorption efficiency of the absorbing solution decreases. For this reason, by supplying the oxidizing gas 27, the sulfurous acid is oxidized to form gypsum, so that the SO ₂ removal performance is restored.

FIG. 10 shows the configuration of the wastewater treatment facility of the prior art. The wastewater treatment facility mainly includes a 1st H / C (hydrocyclone) 38, a 2nd H / C 39, a belt filter 40, a circulating water tank 41, a pH adjustment / heavy metal removal / coagulant addition unit 42. Since the gypsum concentration in the absorption liquid 6 of the desulfurization device 3 is increased by absorbing SO ₂ in the exhaust gas, the gypsum concentration in the absorption liquid is 10 to 30%, or the chlorine concentration in the absorption liquid Extract a part of the absorbent 6 so that it does not exceed a certain concentration, separate it into gypsum 49, drainage 50, and recirculated water 37 using a wastewater treatment facility, and discharge gypsum 49 out of the desulfurization unit 3 . The extracted liquid 36 from the desulfurization apparatus 3 is supplied to the 1stH / C 38 and divided into a liquid on the 1stH / C overflow 43 side and a liquid on the 1stH / C underflow 44 side. The slurry on the H / C underflow 44 side discharges a liquid containing a large amount of gypsum having a large particle diameter, and the slurry on the 1st H / C overflow 43 side discharges a liquid containing a large amount of gypsum having a small particle diameter. The slurry on the 1st H / C underflow 44 side is supplied to the belt filter 40, and the dehydrated gypsum 49 on the belt filter 40 is recovered. The gypsum on the belt filter 40 is washed with industrial water (not shown), and is supplied to the circulating water tank 41 together with the filtrate of the belt filter 40 as the belt filter portion discharge liquid 52. The liquid on the 1st H / C overflow 43 side is also supplied to the circulating water tank 41. The liquid in the circulating water tank 41 is extracted and supplied from the 2nd H / C supply unit 47 to the 2nd H / C 39. By 2ndH / C39, the liquid on the 2ndH / C overflow 45 side and the liquid on the 2ndH / C underflow 46 side are divided, and the liquid on the 2ndH / C underflow 46 side is supplied to the circulating water tank 41. The liquid on the 2ndH / C overflow 45 side is adjusted to pH in the wastewater 50 by pH adjustment, heavy metal removal, and flocculant addition section 42, and heavy metal is captured by supplying TMT (trimercaptotriazine), etc., and polyaluminum chloride The solid particles are aggregated with a polymer flocculant such as the like, and the precipitated solid particles are recovered as the solid material 51 by a press machine or the like (not shown). The drainage water 50 that does not contain the solid matter is adjusted to a liquid temperature by a cooling tower (not shown) or the like and discharged to the sea or the like. Like the recirculated water 37, liquids other than those discharged to the sea or the like are recirculated as make-up water for the desulfurization device 3.

Japanese Patent Laid-Open No. 10-216476

  In conventional exhaust gas treatment equipment, when mercury contained in coal combustion exhaust gas is removed by a conventional desulfurization equipment, no consideration is given to the increase in mercury concentration in the absorption liquid. There was a problem that it was reduced and re-released into the exhaust gas as metallic mercury. In addition, some mercury in the absorption liquid moves from the liquid side to the solid side, that is, the gypsum side, but if the gypsum contains mercury, the gypsum is refused to be collected depending on the intended use of the gypsum. There is a problem that mercury is vaporized and re-released into the atmosphere in the drying or roasting process when gypsum board or cement is produced from gypsum, or in the landfill when gypsum is disposed of in landfills. .

  An object of the present invention is to prevent re-release of metals (particularly mercury) from a desulfurization apparatus and to reduce the concentration of metals such as mercury in immobilized particles such as gypsum.

  The exhaust gas treatment apparatus of the present invention performs desulfurization with an absorbing solution containing a chelate resin.

  According to this configuration, by desulfurization with an absorbing solution containing a chelate resin, the metal (such as mercury) in the absorbing solution is selectively captured, and the re-release of the metal (such as mercury) from the absorbing solution is prevented. be able to.

  The exhaust gas treatment apparatus of the present invention includes a spray nozzle that sprays the absorbing liquid on a flow path of exhaust gas from a combustion apparatus, an absorbing liquid reservoir that is provided below the spray nozzle and stores the dripped absorbing liquid, and the absorbing liquid. A desulfurization device having an oxidizing gas supply unit for supplying an oxidizing gas to the absorption liquid stored in the reservoir, and the chelating resin is added to the absorption liquid stored in the absorption liquid reservoir of the desulfurization device. The chelate resin supply part which supplies directly is provided.

  According to this configuration, by directly supplying the chelating resin to the desulfurization apparatus, the absorbing liquid containing the chelating resin is immediately sprayed on the exhaust gas, and the metal (such as mercury) can be efficiently captured. The re-release of metals (such as mercury) can be prevented immediately.

  The exhaust gas treatment apparatus of the present invention extracts the absorption liquid from the absorption liquid reservoir, a first separation apparatus that separates the immobilized particles on which sulfur oxide is immobilized from the absorption liquid, and the immobilized particles. A second separation device for separating the chelate resin from the separated liquid, and the liquid after the separation of the chelate resin by the second separation device is recirculated to the desulfurization device.

  According to this configuration, mercury in the liquid is unevenly distributed on the chelate resin side by desulfurization with an absorption liquid containing a chelate resin having a function of adsorbing metal (such as mercury), so the metal concentration on the liquid side in the absorption liquid An increase in (mercury concentration) can be prevented, and a liquid having a low metal concentration (mercury concentration) can be recycled to the desulfurization apparatus.

  In the exhaust gas treatment apparatus of the present invention, the separation device is at least one of a hydrocyclone, a thickener, and a belt filter.

  According to this configuration, the solid (immobilized particles or chelate resin) and the liquid can be separated by using at least one separation device of a hydrocyclone, a thickener, and a belt filter.

  The exhaust gas treatment apparatus of the present invention includes a coagulant addition device that supplies a flocculant upstream of the second separation device.

  According to this configuration, by supplying the flocculant, the chelate resin can be reliably separated, and re-release of the metal (such as mercury) from the absorbing solution can be prevented.

  In the exhaust gas treatment apparatus of the present invention, the metal concentration in the desulfurized exhaust gas is within the range of the regulation value, and at least one of the concentration of the chelate resin in the absorption liquid and the amount of circulating liquid in the absorption liquid is minimized. An adjustment unit for adjusting the absorption liquid.

  According to this configuration, it is possible to optimize the concentration of the chelate resin in the absorption liquid and the amount of the circulating liquid in the absorption liquid, efficiently capture the metal (such as mercury) in the absorption liquid, Re-release of mercury, etc.).

  In the exhaust gas treatment apparatus of the present invention, the polymer substrate of the chelate resin is at least one of polyacryl, polyhydroxyethyl methacrylate, polyacryl, phenol resin, and polystyrene.

  According to this configuration, mercury in the absorbing liquid can be selectively adsorbed.

  In the exhaust gas treatment apparatus of the present invention, the coordination group of the chelate resin is at least one of a thiol form, a dithiocarbamic acid form, an isothiuronium form, a dithizone form, and a thiourea form.

  According to this configuration, mercury in the absorbing liquid can be selectively adsorbed.

  In the exhaust gas treatment apparatus of the present invention, the chelate resin has a particle size of 100 μm or less.

  According to this configuration, it is possible to increase the adsorption rate of a metal (mercury or the like) and to prevent re-release of the metal (mercury or the like) from the absorbing liquid.

  In the exhaust gas treatment apparatus of the present invention, the absorption liquid includes immobilized particles on which sulfur oxides are immobilized, and the particle diameter of the chelate resin is larger than the particle diameter of the immobilized particles.

  According to this configuration, by making the particle diameter of the chelate resin larger than the particle diameter of the immobilized particles, the chelate resin and the immobilized particles can be efficiently separated, and the metal (such as mercury) from the absorption liquid can be separated. Re-release can be prevented.

  In the exhaust gas treatment apparatus of the present invention, the chelate resin has a particle size of 300 μm or more.

  According to this configuration, when the immobilized particles are gypsum, since the particle diameter of the immobilized particles is less than 100 μm, the particle diameter of the chelate resin can be made larger than the particle diameter of the immobilized particles. And the immobilized particles can be separated efficiently, and re-release of metal (such as mercury) from the absorbing solution can be prevented.

  The exhaust gas treatment apparatus of the present invention includes a filter that captures the chelate resin and passes the immobilized particles.

  According to this configuration, the filter can capture the chelate resin and allow the immobilized particles to pass through, and the chelate resin and the immobilized particles can be separated efficiently, and the metal (such as mercury) from the absorption liquid can be separated. Re-release can be prevented.

  The present invention prevents the re-release of metals (especially mercury) from the desulfurization equipment and reduces the concentration of metals such as mercury in fixed particles such as gypsum by performing desulfurization with an absorbing solution containing a chelate resin. Provided is an exhaust gas treatment apparatus capable of

It is the figure which showed an example of the exhaust gas processing apparatus which concerns on embodiment of this invention. It is the figure which showed the mercury re-release prevention effect of chelate resin. It is the figure which showed the abundance ratio of mercury in an absorption liquid. It is the figure which showed an example of the waste gas processing apparatus which provided the 2nd separation apparatus (3rdH / C). It is the figure which showed the transfer ratio of the mercury to the collect | recovered gypsum side when not using a chelate resin. It is the figure which showed an example of the waste gas processing apparatus which provided the 2nd separation apparatus (2ndH / C) in the upstream of recirculation water. FIG. 3 is a view showing an example of an exhaust gas treatment apparatus in which a filter for separating a chelate resin is provided on the upstream side of 1stH / C. It is the figure which showed the structure of the conventional boiler plant for thermal power generation. It is the figure which showed the structure of the conventional desulfurization apparatus. It is the figure which showed the structure of the conventional waste water treatment facility.

  Hereinafter, an exhaust gas treatment apparatus according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a limestone gypsum method that is one of alkali slurry methods is used. In the limestone gypsum method, an absorption liquid containing limestone is sprayed on exhaust gas, sulfurous acid (sulfur oxide) in the exhaust gas is absorbed into the absorption liquid, sulfurous acid in the absorption liquid reacts with the oxidizing gas, and sulfurous acid (sulfur oxide) ) In gypsum (immobilized particles). The description of the configuration and operation common to the prior art is omitted.

  An example of the configuration of the exhaust gas treatment apparatus of the embodiment of the present invention is shown in FIG. The exhaust gas treatment device 100 includes a desulfurization device 3. The desulfurization apparatus 3 includes a spray nozzle 4, an absorption liquid circulation pump 5, a mist eliminator 8, an oxidizing gas supply unit 9, a stirrer 10, an absorption liquid reservoir unit 11, and a chelate resin supply unit 60.

  The spray nozzle 4 sprays the absorbing liquid onto the exhaust gas flow path from the combustion device including the boiler. The absorbing liquid reservoir 11 is provided at the lower part of the spray nozzle 4 and stores the dropped absorbing liquid. The oxidizing gas supply unit 9 supplies the oxidizing gas to the absorbent stored in the absorbent reservoir 11.

  The exhaust gas treatment apparatus 100 includes a chelate resin supply unit 60 that directly supplies a chelate resin to the absorption liquid stored in the absorption liquid storage part 11 of the desulfurization apparatus 3.

  In the chelate resin, the polymer substrate is at least one of polyacryl, polyhydroxyethyl methacrylate, polyacryl, phenol resin, and polystyrene. The coordination group of the chelate resin is at least one of a thiol form, a dithiocarbamic acid form, an isothiuronium form, a dithizone form, and a thiourea form.

  In the present embodiment, a preferable configuration is shown in which the chelate resin supply unit 60 directly supplies the chelate resin to the absorption liquid reservoir unit 11. However, it is also possible to supply the chelate resin to the line in the process of spraying the absorbent 6 from the spray nozzle 4 through the absorbent circulating pump 5 from the absorbent reservoir 11. It is also possible to extract the absorbent 6 to the outside, supply a chelate resin into the extracted absorbent 6, and return the absorbent 6 to the absorbent reservoir 11. It is also possible to supply a chelate resin in the absorbent 6 in advance. Thus, in the present embodiment, the exhaust gas treatment device 100 performs desulfurization using the absorbing liquid 6 containing a chelate resin.

  Generally, a chelate resin has a particle size of about 300 μm to 1600 μm, and is used as a method for removing mercury in wastewater from a waste treatment apparatus. In this case, mercury in the liquid can be removed by supplying an absorption liquid containing mercury from which suspended substances have been removed with a filtration membrane into a packed tower containing a chelate resin.

  However, in the present embodiment, even if desulfurization is performed with the absorption liquid 6 containing a chelate resin, gypsum slurry and other suspensions, high mercury removal performance and prevention of mercury re-release can be realized. It has been found that the mercury concentration in gypsum can be reduced. Depending on the type of chelate resin, about 140 g or more of Hg can be adsorbed per 1 L of chelate resin. If the concentration of the chelate resin is adjusted in accordance with the amount of Hg absorbed by the desulfurization apparatus, Hg in the absorbent 6 can be adsorbed on the chelate resin side.

FIG. 2 shows the result of comparing the amount of mercury re-release in the case of desulfurization with the absorption liquid 6 containing a chelate resin and in the case of desulfurization with the absorption liquid 6 not containing a chelate resin (adsorbent). As shown in FIG. 2, the amount of mercury re-released without the chelate resin was 2.5 μg / m ³ N, whereas mercury was hardly re-released 5 minutes after the chelate resin was supplied. The residence time until the absorbing liquid 6 in the absorbing liquid reservoir 11 of the desulfurization apparatus 3 is sprayed is about 5 minutes, and almost no mercury is re-released 5 minutes after the chelating resin is supplied. Has a reaction rate sufficient to adsorb mercury.

  Moreover, in a packed tower containing a separate chelate resin that is normally used, the liquid passing therethrough is one-through, and it is necessary to fill a large amount of chelate resin in order to obtain a high solid-liquid contact area. In this embodiment, the time for the mercury-containing absorbing liquid 6 and the chelate resin to contact with each other becomes longer, and thus there is an advantage that the amount of the chelate resin used can be reduced.

  FIG. 3 shows the proportion of mercury in the gypsum and chelating agent in the absorbent 6. As shown in FIG. 3, when there is no chelating agent (chelating resin) and the mercury content on the liquid side in the absorbing liquid 6 is 100%, most of the chelating agent contained in the absorbing liquid 6 It can be seen that mercury (about 98%) has moved to the chelate resin side. This is because the chelate resin has a higher adsorption rate than gypsum. Further, by pulverizing a chelate resin having a particle size of about 300 μm to 1600 μm (or in the step of producing the chelate resin), the particle size can be reduced to 100 μm or less, thereby increasing the mercury adsorption rate. Preferably, by setting the particle size of the chelate resin to 20 μm or less, gypsum and chelating agent (chelate resin) can be efficiently separated by H / C (hydrocyclone) or belt filter of waste water treatment equipment. The mercury concentration can be reduced by 80%.

  The chelating agent (chelating resin) maintains Hg capture performance even when the particle size is reduced. Therefore, if the particle size is reduced and the surface area in contact with mercury in the absorbent 6 is increased, the chelating resin adsorption rate Can be faster.

  In addition, when the particle size of the chelate resin is small, when using a conventional wastewater treatment facility as shown in FIG. 10, especially by using H / C (hydrocyclone), gypsum and chelating agent (chelate) in the absorbent 6 Resin) and mercury concentration on the gypsum side can be reduced. However, in the conventional system as shown in FIG. 10, the liquid that has been drained as make-up water for the desulfurization device 3 is supplied to the desulfurization device 3 as recirculation water 37. The recycled water 37 contains chelate resin discharged as 1stH / C overflow 43 from the 1stH / C38 (hydrocyclone) 38, so that the adsorbent (chelate resin) is recycled to the desulfurization unit 3. Become. Accordingly, since the amount of the chelate resin contained in the solid 51 that mainly discharges the chelate resin is smaller than the amount of the chelate resin contained in the gypsum 49 discharged from the belt filter 40, gypsum and mercury are included. The separation performance of the chelate resin is relatively low. That is, the chelate resin that is not discharged as the solid material 51 is recycled as it is to the desulfurization device 3 as the recirculated water 37, so that the separation performance between the chelate resin containing mercury and the gypsum becomes relatively low.

  Therefore, as an example of a method for improving the separation performance of the chelate resin containing gypsum and mercury, FIG. 4 shows an example of a configuration in which 3rdH / C (hydrocyclone) 64 is provided. As shown in FIG. 4, the exhaust gas treatment device 100 extracts 1st absorption liquid 6 from the absorption liquid reservoir 11 and separates gypsum (immobilized particles) having sulfur oxide immobilized thereon from the absorption liquid 36 1stH / C38 ( A first separation device) and 3rdH / C64 (second separation device) for separating the chelate resin from the liquid 48 after separating the gypsum (immobilized particles). Recirculated water 37 (liquid on the overflow side of 3rdH / C64), which is the liquid after separating the chelate resin by 3rdH / C64, is recirculated to the desulfurization apparatus 3.

  In addition, a coagulant adding device 53 for supplying a flocculant to the upstream side of 3rdH / C64 (second separation device) is provided. By adding a flocculant such as polyaluminum chloride from the upstream side of 3rdH / C64 using a flocculant addition device 53, the chelate resin can be taken out from the underflow side of 3rdH / C64 and does not contain a chelate resin. By using the recycled water 37, the amount of the chelate resin containing mercury can be increased, and the amount of the chelate resin containing mercury mixed in the gypsum 49 can be reduced.

  FIG. 5 shows the rate of mercury transfer to the gypsum 49 side. As shown in FIG. 5, the amount of mercury in the gypsum 49 can be reduced by about 80% by using the chelate resin as compared with the mercury concentration in the gypsum 49 when the conventional chelate resin is not used.

  FIG. 6 shows an example of a configuration in which 2ndH / C is provided on the upstream side of the recirculated water. As shown in FIG. 6, 2ndH / C54 (second separation device) for separating the chelate resin from the liquid 48 after separating gypsum (immobilized particles) may be provided instead of 3rdH / C64. In this case, the liquid on the overflow side of 2ndH / C54 is supplied as the recirculation water 37 of the desulfurization apparatus 3. The separation device may be at least one of a hydrocyclone, a thickener, and a belt filter. In other words, any device other than H / C (hydrocyclone) can be used as a separation device as long as it can separate into a liquid containing a chelate resin and a liquid not containing it.

  As mentioned above, although embodiment concerning this invention was described, this invention is not limited to these, It can change and deform | transform within the range described in the claim.

  For example, as shown in FIG. 7, the exhaust gas treatment apparatus 100 may include a filter (chelate resin separation filter 61) that captures the chelate resin and passes gypsum (immobilized particles). In FIG. 7, a chelate resin separation filter 61 is provided on the upstream side of the 1st H / C 38 as compared with the system of FIG.

  In this case, the particle diameter of the chelate resin in the absorbing liquid 6 is 300 μm or more. The chelate resin separation filter 61 has a pore diameter of 100 μm or more and less than 300 μm. Therefore, the chelate resin 62 of 300 μm or more is collected on the filter. On the other hand, the liquid that does not contain the chelate resin is supplied to the H / C inlet absorbing liquid 63 that is the liquid that has passed through the filter 61 for separating the chelate resin. Since the gypsum particle size is less than 100 μm, gypsum (immobilized particles) passes through the chelate resin separation filter 61, so the chelate resin separation filter 61 separates the chelating agent (chelate resin) and gypsum containing mercury. Is possible. That is, when the absorption liquid contains immobilized particles (gypsum on which sulfur oxide is immobilized) and the particle diameter of the chelate resin is larger than the particle diameter of the immobilized particles, the chelate resin separation filter 61 contains mercury. Separate the chelating agent (chelating resin) and gypsum.

  Further, in the exhaust gas treatment apparatus 100, the metal concentration (mercury concentration) in the desulfurized exhaust gas is within the range of the regulation value, and at least one of the concentration of the chelate resin in the absorbent and the amount of the circulating fluid in the absorbent is minimized. An adjustment unit for adjusting the absorbent may be provided. When adjusting the absorption liquid so that the concentration of the chelate resin in the absorption liquid is minimized, the chelate resin supply part 60 corresponds to the adjustment part, and the absorption liquid is adjusted so that the circulating liquid amount of the absorption liquid is minimized. In this case, the absorption liquid circulation pump 5 corresponds to the adjustment unit.

  Moreover, in this Embodiment, although the limestone gypsum method was used, the other known desulfurization method is also applicable. In this case, the absorbing liquid and the immobilized particles are also appropriately changed according to the selected desulfurization method.

The exhaust gas treatment apparatus according to the present invention has the effects of preventing the re-release of metals (particularly mercury) from the desulfurization apparatus and reducing the concentration of metals such as mercury in fixed particles such as gypsum. In addition, it is useful as an exhaust gas treatment device including a wet flue gas desulfurization device (or desulfurization device) for removing sulfur oxide (SO ₂ ) and mercury (Hg) contained in combustion exhaust gas.

1 Desulfurization equipment inlet exhaust gas
2 Desulfurizer exhaust gas
3 Desulfurization equipment
4 Spray nozzle
5 Absorbent circulation pump
6 Absorbent
8 Mist Eliminator
9 Oxidizing gas supply section
10 Stirrer
11 Absorption liquid reservoir
13 Boiler
14 Denitration equipment
15 A / H
16 Dust collector
19 Alkaline agent
25 coal
26 Desulfurization absorption part
27 Oxidizing gas
29 Chimney
36 Extraction liquid
37 Recirculated water
38 1st H / C
39 2nd H / C
40 Belt filter
41 Circulating water tank
42 pH adjustment, heavy metal removal, flocculant addition section
43 1st H / C overflow
44 1st H / C underflow
45 2nd H / C overflow
46 2nd H / C underflow
47 2nd H / C supply section
48 liquid
49 Gypsum
50 Drainage
51 Solid
52 Belt filter drainage
53 Flocculant addition equipment
56 Belt filter for recirculated water
60 Chelate resin supply section
61 Chelate resin separation filter
62 Chelating resin
63 Absorption liquid for H / C inlet
64 3rd H / C
66 3rd H / C underflow

Claims (10)

A spray nozzle for spraying an absorbing liquid containing a chelate resin to a flow path of exhaust gas from the combustion device, an absorbing liquid reservoir portion provided at a lower portion of the spray nozzle for storing the dripped absorbing liquid, and stored in the absorbing liquid reservoir section. A desulfurization apparatus having an oxidizing gas supply unit for supplying an oxidizing gas to the absorbing liquid;
A chelate resin supply unit that directly supplies the chelate resin to the absorption liquid stored in the absorption liquid reservoir of the desulfurization apparatus;
A first separation device for extracting the absorbent from the absorbent reservoir and separating the immobilized particles, on which sulfur oxides are immobilized, from the absorbent;
A second separation device for separating the chelate resin from the liquid after separating the immobilized particles,
The liquid after separation of the chelating resin by a second separation device, be recycled exhaust gas treatment apparatus it said to the desulfurization apparatus. The exhaust gas treatment apparatus according to claim 1 , wherein the separation device is at least one of a hydrocyclone, a thickener, and a belt filter. Exhaust gas treatment apparatus according to claim 1 or 2, characterized in that it comprises a coagulant addition device for supplying coagulant to the upstream side of the second separator. Adjustment that adjusts the absorbent so that the metal concentration in the desulfurized exhaust gas falls within the range of the regulation value, and at least one of the concentration of the chelate resin in the absorbent and the amount of circulating fluid in the absorbent is minimized. exhaust gas treatment apparatus according to any one of claims 1 to 3, characterized in that it comprises a part. Polymer base of the chelating resin, polyacrylic, polymethacrylic acid hydroxyethyl, polyacrylic, phenolic resin, and according to any one of claims 1 to 4, characterized in that at least one of polystyrene Exhaust gas treatment equipment. The coordination group of the chelate resin is at least one of a thiol form, a dithiocarbamic acid form, an isothiuronium form, a dithizone form, and a thiourea form, according to any one of claims 1 to 5. Exhaust gas treatment equipment. The exhaust gas treatment apparatus according to any one of claims 1 to 6 , wherein a particle diameter of the chelate resin is 100 µm or less. The absorption liquid includes immobilized particles on which sulfur oxide is immobilized,
The exhaust gas treatment apparatus according to any one of claims 1 to 7 , wherein a particle diameter of the chelate resin is larger than a particle diameter of the immobilized particles. The exhaust gas treatment apparatus according to claim 8 , wherein a particle diameter of the chelate resin is 300 μm or more. The exhaust gas treatment apparatus according to claim 8 or 9 , further comprising a filter that captures the chelate resin and allows the immobilized particles to pass therethrough.

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