CN115427133A - Exhaust gas treatment system and exhaust gas treatment method - Google Patents
Exhaust gas treatment system and exhaust gas treatment method Download PDFInfo
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- CN115427133A CN115427133A CN202180027835.4A CN202180027835A CN115427133A CN 115427133 A CN115427133 A CN 115427133A CN 202180027835 A CN202180027835 A CN 202180027835A CN 115427133 A CN115427133 A CN 115427133A
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- 238000011282 treatment Methods 0.000 title claims abstract description 173
- 238000000034 method Methods 0.000 title claims description 28
- 239000007789 gas Substances 0.000 claims abstract description 396
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 196
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000001301 oxygen Substances 0.000 claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 70
- 238000011084 recovery Methods 0.000 claims abstract description 39
- 230000002378 acidificating effect Effects 0.000 claims abstract description 30
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 20
- 238000004868 gas analysis Methods 0.000 claims abstract description 19
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 68
- 239000002253 acid Substances 0.000 claims description 32
- 229910052815 sulfur oxide Inorganic materials 0.000 claims description 31
- 239000007787 solid Substances 0.000 claims description 20
- 230000003472 neutralizing effect Effects 0.000 claims description 9
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 45
- 238000004458 analytical method Methods 0.000 description 41
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 22
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 16
- 239000000920 calcium hydroxide Substances 0.000 description 16
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 16
- 235000011116 calcium hydroxide Nutrition 0.000 description 16
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 12
- 239000010881 fly ash Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 8
- 239000000428 dust Substances 0.000 description 8
- 238000006386 neutralization reaction Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000011088 calibration curve Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 description 1
- YLUIKWVQCKSMCF-UHFFFAOYSA-N calcium;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[Mg+2].[Ca+2] YLUIKWVQCKSMCF-UHFFFAOYSA-N 0.000 description 1
- LWNKHILEJJTLCI-UHFFFAOYSA-J calcium;magnesium;tetrahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[Mg+2].[Ca+2] LWNKHILEJJTLCI-UHFFFAOYSA-J 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010574 gas phase reaction Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000001307 laser spectroscopy Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000011328 necessary treatment Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
Provided is an exhaust gas treatment system capable of predicting the time at which the concentration of an acidic gas starts to increase in advance from the change in the oxygen concentration in conjunction with the change in the concentration of the acidic gas in an exhaust gas, and adding an appropriate amount of a treatment agent at an appropriate timing. The disclosed device is provided with: a treating agent addition management unit (13) that has an exhaust gas analysis unit (131, 132), wherein the exhaust gas analysis unit (131, 132) is disposed on at least one of the upstream side and the downstream side of the exhaust gas recovery unit (16) and analyzes at least the oxygen concentration in the exhaust gas, and wherein the treating agent addition management unit (13) calculates the amount of addition of the treating agent required for treating the acidic gas contained in the exhaust gas treated by the exhaust gas treatment unit (11) based on the amount of change in the oxygen concentration analyzed by the exhaust gas analysis unit (132), and instructs the supply of the treating agent in the calculated amount of addition; and a treatment agent supply unit (14) that supplies the treatment agent in the amount indicated by the treatment agent addition management unit (13).
Description
Technical Field
The present invention relates to an exhaust gas treatment system and an exhaust gas treatment method.
Background
Conventionally, solid matters and acidic gases in exhaust gas are removed by reducing the temperature of the exhaust gas discharged from an incinerator in a temperature reduction tower and then passing the exhaust gas through a filter type dust collecting apparatus, and the exhaust gas is discharged to the atmosphere from a chimney.
However, the acid gas cannot be completely removed by merely passing the exhaust gas through the filter type dust collecting apparatus. Currently, most domestic incineration plants adopt a dry exhaust gas treatment method in which slaked lime is continuously blown into a flue from a temperature reduction tower to a filter type dust collecting device to neutralize and remove acid gas. For example, there are used a large number of exhaust gas treatment methods and exhaust gas treatment apparatuses in which a chemical for removing an acidic gas in exhaust gas by neutralization is applied to a cloth such as a nonwoven fabric of a filter type dust collector for purifying exhaust gas discharged from a gas generation source such as an incinerator. However, the treatment of the exhaust gas is insufficient, and an acid gas such as sulfur oxide leaks. Therefore, the following proposals have been made to remove the acidic gas in the exhaust gas.
Patent document 1 discloses a waste incinerator exhaust gas treatment method in which, when the concentration of an acidic gas in exhaust gas exceeds a predetermined value at the outlet side or inlet side of a filter type dust collecting device and the exceeding state continues for a predetermined time, a sodium-based chemical is supplied to the inlet side of the filter type dust collecting device in an amount set according to the measured value. Patent document 2 discloses an exhaust gas treatment device including: an upstream side acid gas concentration meter that measures an acid gas concentration of the exhaust gas; and a downstream acid gas concentration meter for measuring the acid gas concentration of the exhaust gas at a position downstream of the dust collecting device, and supplying a powder neutralizing agent to the exhaust gas between the reaction unit and the dust collecting device to neutralize the remaining part of the acid gas. Patent document 3 discloses a desulfurizing agent addition control method in which a control value of the present time is calculated based on a first difference that is a difference between an N-hour moving average of an SOx concentration before N hours and an N-hour moving average of a current SOx concentration and a control value used for calculation of an addition amount of a desulfurizing agent before N hours, and the addition amount of the desulfurizing agent is determined based on the control value of the present time.
However, in patent documents 1 to 3, sulfur oxides (SOx) in the acid gas are analyzed in each case, and since a considerable amount of time is required until the analysis result of the sulfur oxides is obtained, even if the concentration of the sulfur oxides in the exhaust gas is greatly increased, the amount of the treating agent required for treating the increased sulfur oxides cannot be added immediately because of a time delay until the analysis result is obtained, and as a result, the sulfur oxides that have not been sufficiently treated may be discharged into the atmosphere. Therefore, it is necessary to add a certain amount of the treating agent for treating sulfur oxides more than the necessary addition amount, but adding a certain amount of the treating agent more than the necessary addition amount causes unreacted treating agent to be included in the solid matter including fly ash and the like separated and removed by the exhaust gas recovery unit, and therefore the recovery amount of the solid matter increases. When the solid matter thus increased is disposed of by a reclamation site, etc., it is necessary to prepare an extra storage space in the reclamation site, which is not preferable.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2019-070471
Patent document 2: japanese patent laid-open publication No. 2017-124348
Patent document 3: japanese patent laid-open publication No. 2017-176922
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide an exhaust gas treatment system and an exhaust gas treatment method capable of adding an appropriate amount of a treatment agent at an appropriate timing by predicting a timing at which the concentration of an acidic gas starts to increase in advance from a fluctuation in oxygen concentration in conjunction with a fluctuation in the concentration of the acidic gas in an exhaust gas.
Means for solving the problems
In order to solve the above problems, the main structure of the present invention is as follows.
(1) An exhaust gas treatment system is provided with: an exhaust gas treatment unit for treating exhaust gas; an exhaust gas recovery unit for separating and removing solid components from the exhaust gas treated by the exhaust gas treatment unit; a treatment agent storage unit that stores a treatment agent for treating the exhaust gas; a treating agent addition management unit that includes an exhaust gas analysis unit that is disposed on at least one of an upstream side and a downstream side of the exhaust gas recovery unit and that analyzes at least an oxygen concentration in the exhaust gas, and that calculates an addition amount of a treating agent necessary for treating an acidic gas contained in the exhaust gas treated by the exhaust gas treatment unit based on a variation amount of the oxygen concentration precipitated by the exhaust gas analysis unit and instructs supply of the treating agent in the calculated addition amount; and a treatment agent supply unit that supplies the treatment agent in the amount indicated by the treatment agent addition management unit from the treatment agent storage unit to the exhaust gas treatment unit.
(2) The exhaust gas treatment system according to (1), wherein the exhaust gas analyzing unit is disposed downstream of the exhaust gas recovering unit.
(3) The exhaust gas treatment system according to (1) or (2), wherein the treatment agent has a property of neutralizing an acid gas in the exhaust gas.
(4) The exhaust gas treatment system according to any one of (1) to (3), wherein the acid gas is a sulfur oxide gas.
(5) An exhaust gas treatment method comprising calculating an amount of a treating agent required for treating an acidic gas contained in an exhaust gas treated by an exhaust gas treatment unit based on a variation in oxygen concentration analyzed by the exhaust gas analysis unit having a treating agent addition management unit for analyzing at least the oxygen concentration in the exhaust gas, instructing a treating agent supply unit to supply the calculated amount of the treating agent, and supplying the instructed amount of the treating agent from a treating agent storage unit to the exhaust gas treatment unit to treat the acidic gas contained in the exhaust gas, wherein the exhaust gas analysis unit is disposed on at least one of an upstream side and a downstream side of an exhaust gas recovery unit for separating a gas contained in the exhaust gas from solids and recovering and removing the solids.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the exhaust gas treatment system and the exhaust gas treatment method of the present invention, the concentration of sulfur oxides contained in the exhaust gas discharged into the atmosphere is not rapidly increased, the concentration can be stably kept low, and the amount of the unreacted treating agent in the solid matter separated and removed by the exhaust gas recovery unit is also reduced.
Drawings
Fig. 1 is a diagram showing the configuration of an exhaust gas treatment system for carrying out the exhaust gas treatment method of the present invention.
FIG. 2 is a diagram showing the SO based on the content of the exhaust gas 2 Analysis result of concentration of (3) and SO when a treating agent is added 2 Concentration, O 2 Graph of the concentration and the transition of the input amount of the slaked lime.
FIG. 3 is a graph showing the relationship between O contained in exhaust gas 2 Analysis result of concentration of (3) and SO when a treating agent is added 2 Concentration, O 2 Graph of the concentration and the transition of the input amount of the slaked lime.
Detailed Description
The following describes embodiments of the present invention. The following description is an example of the embodiment of the present invention, and does not limit the claims.
(exhaust gas treatment System)
An exhaust gas treatment system 1 according to the present embodiment is an exhaust gas treatment system including: an exhaust gas treatment unit 11 for treating exhaust gas; an exhaust gas recovery unit 16 for recovering the solid component from the exhaust gas treated by the exhaust gas treatment unit 11Separating and recovering the solid component; a treatment agent storage unit 12 for storing a treatment agent for treating the exhaust gas; a treating agent addition control unit 13 having exhaust gas analyzing units 131 and 132, the exhaust gas analyzing units 131 and 132 being disposed on at least one of the upstream side and the downstream side of the exhaust gas recovery unit 16 and analyzing at least oxygen (O) in the exhaust gas 2 ) A concentration calculation unit 13 that calculates an amount of the treating agent required for treating the acidic gas contained in the exhaust gas treated by the exhaust gas treatment unit 11 based on the amount of change in the oxygen concentration analyzed by the exhaust gas analysis units 131 and 132, and instructs supply of the treating agent in the calculated amount of addition; and a treating agent supply unit 14 that supplies the treating agent in the amount indicated by the treating agent addition management unit 13 from the treating agent storage unit 12 to the exhaust gas treatment unit 11. Further, the exhaust gas treatment system 1 is provided with exhaust gas analyzing units 131 and 132 for analyzing the oxygen concentration in the exhaust gas.
(construction of exhaust gas treatment System)
Fig. 1 is a diagram showing the configuration of an exhaust gas treatment system for carrying out the exhaust gas treatment method of the present invention. In fig. 1, a solid line among lines connecting blocks represents a flow of an object, and a dashed-dotted line represents a flow of information.
The treating agent exhaust gas treatment system 1 according to the present embodiment is mainly composed of an incinerator F, an exhaust gas treatment unit 11, a treating agent supply unit 12, a treating agent storage unit 14, a treating agent addition management unit 13 including exhaust gas analysis units 131 and 132, and an exhaust gas recovery unit 16, and is further provided with a flow meter 17 and a chimney 18. The structure of the exhaust gas treatment system 1 will be described in detail below.
(incinerator)
The incinerator F is, for example, a municipal waste incinerator, an industrial waste incinerator, a power generation boiler, a carbonization furnace, a civil plant, or other combustion facilities. Generally, the exhaust gas discharged from an urban refuse incinerator contains harmful acidic gases and solid substances (hereinafter, referred to as "fly ash") such as hydrogen chloride (HCl), sulfur oxide (SOx), and nitrogen oxide (NOx), depending on the type of refuse to be incinerated. Among them, the most abundant is sulfur oxide. The exhaust gas is not particularly limited in its origin of generation and its content, and refers to a gas generated by burning various wastes. The "acid gas" refers to a gas that exhibits acidity after being dissolved in a solution, and for example, refers to a gas containing hydrogen chloride, sulfur oxide, and the like.
(exhaust gas treating section)
The exhaust gas treatment unit 11 is used to perform treatment for introducing and adding a treatment agent to the exhaust gas. Since the exhaust gas is an acidic gas containing sulfur oxides, it is necessary to neutralize the acidic gas to suppress the emission of harmful gases to the environment before the exhaust gas is emitted to the atmosphere. Therefore, in the exhaust gas treatment section 11, a neutralizing agent is added to the exhaust gas as a treatment agent to neutralize the exhaust gas.
As the treating agent (hereinafter, sometimes referred to as "neutralizing agent"), a neutralizing agent is used. Such a treating agent can neutralize the acid gas contained in the exhaust gas by contacting with the exhaust gas.
The exhaust gas treatment unit 11 is not particularly limited as long as the exhaust gas can be brought into contact with a solid treatment agent to react with the solid treatment agent, and, for example, a part of a flue (a flow path of the gas) or the like may be used as the exhaust gas treatment unit 11. As the flue, a part of a duct or the like for conveying the exhaust gas to the exhaust gas recovery unit 16 such as a bag filter on the downstream side may be used. The exhaust gas treatment unit 11 may be a closed vessel additionally provided in a flue (gas flow path), various reaction vessels, or the like.
The acidic gas contained in the exhaust gas does not need to be chemically neutralized in the exhaust gas treatment unit 11 in its entire amount, and may be neutralized on the downstream side of the exhaust gas treatment unit 11 (for example, on the flue from the exhaust gas treatment unit 11 to the exhaust gas recovery unit 16) as the treatment agent is transported together with the exhaust gas. For example, in the case of using slaked lime as a treating agent, since the reaction of slaked lime with acid gas is slow, such a situation may arise.
In addition, the treatment of the exhaust gas can be carried out in a continuous manner. Further, for example, the reaction may be carried out in a batch system using a closed vessel, various reaction vessels for gas phase reaction, or the like. In any case, the amount of the exhaust gas to be treated is not particularly limited, and can be appropriately designed in consideration of the amount of the exhaust gas generated by burning the waste.
(treating agent reservoir)
The treatment agent reservoir 14 stores a treatment agent for treating the exhaust gas. In the exhaust gas treatment system 1 of the present embodiment, the treatment agent accumulated in the reservoir 14 is managed. The reservoir 14 is not particularly limited as long as it can store the treatment agent, but, for example, a reservoir tank or a silo can be used. The capacity and shape of the reservoir 14 are not particularly limited, and can be designed appropriately in consideration of the installation space, the operation schedule of the exhaust gas treatment, the amount of the exhaust gas to be treated, the frequency of the exhaust gas treatment, the frequency of ordering the treatment agent, and the like.
(treating agent addition control section)
The treating agent addition management unit 13 includes exhaust gas analyzers 131 and 132 disposed on either or both of the upstream side and the downstream side of the exhaust gas treatment unit 11. The treating agent addition management unit 13 analyzes the exhaust gas by the exhaust gas analysis units 131 and 132, calculates the amount of the treating agent required for treating the exhaust gas, and instructs the supply of the treating agent in the calculated amount. In this way, the treating agent addition managing unit 13 varies the amount of the treating agent to be added according to the variation of the analysis value, depending on the nature of the exhaust gas to be treated (for example, the concentration and flow rate of the acidic gas), the size of the exhaust gas treating unit 11, and the like. The "upstream side" and the "downstream side" herein refer to upstream and downstream in the flow of the exhaust gas.
Further, the instruction regarding the amount of the treatment agent to be added transmitted from the treatment agent addition management unit 13 is transmitted to the treatment agent supply unit 14 such as a constant feeder provided upstream of the exhaust gas treatment unit 11, for example, and the treatment agent supply unit 14 is operated based on the instruction, so that a predetermined amount of the treatment agent can be added to the exhaust gas treatment unit 11.
Preferably, the treating agent addition management unit 13 includes an arithmetic circuit that calculates various numerical values using numerical values stored in a numerical value manner when each component such as sulfur oxide decreases in accordance with the number of times of treatment of the exhaust gas or the treatment time, in the case where the exhaust gas is treated with a treating agent in a fixed amount of addition for each fixed amount (for example, a fixed flow rate, a fixed time, or one batch) of the exhaust gas, when the treatment of the exhaust gas in the exhaust gas treatment unit 11 is performed. Control methods for performing arithmetic processing include a method (feed-forward control) of analyzing the acid gas in the exhaust gas to calculate the amount of the treating agent necessary for neutralizing the acid gas, and a method (feed-back control) of calculating the amount of the treating agent necessary based on the acid gas in the exhaust gas after the treatment.
(exhaust gas analyzing section)
The flue gas analysis units 131 and 132 analyze the properties of the flue gas before and after the treatment agent is added, and can analyze the concentrations of hydrogen chloride (HCl), sulfur oxide (SOx), and nitrogen oxide (NOx) in the flue gas. In addition, the flow rate of the exhaust gas can also be analyzed. The analysis values of the exhaust gas analyzers 131, 132 are managed by the treating agent addition management unit 13.
Preferably, the exhaust gas analyzers 131 and 132 are disposed downstream of the exhaust gas recovery unit 16. Although it may be located upstream of the exhaust gas recovery unit 16, the amount of fly ash upstream of the exhaust gas recovery unit 16 is large, and the exhaust gas after filtering and recovering the fly ash is analyzed by the exhaust gas analyzer 132, whereby the accuracy of analysis of the exhaust gas can be improved. Accordingly, instead of analyzing the sulfur oxide concentration, the exhaust gas analyzer 132 analyzes the oxygen concentration, and if the oxygen concentration starts to decrease as a result of the analysis, the treating agent is added in accordance with the oxygen concentration. The oxygen concentration analysis methods include a zirconia method, a magnetic method, a laser spectroscopy method, and an electrode method. Any method can be used, but the method using zirconia is preferable.
In the zirconia system, porous platinum electrodes are bonded to both surfaces of a zirconia element and heated, and when gases having different oxygen partial pressures are brought into contact with the respective surfaces, an oxygen concentration cell is generated. The cell generates an electromotive force between the two electrodes, and the oxygen concentration can be analyzed. In addition, by comparing the analysis results obtained from the exhaust gas analyzing sections 131 and 132 respectively disposed on the upstream side and the downstream side of the exhaust gas treating section 11 with each other, the amount of the treating agent required for neutralizing the exhaust gas can also be calculated more accurately.
In order to further improve the calculation accuracy of the amount of the treating agent used, the amount of the exhaust gas is analyzed by the exhaust gas flow meter 19. In addition, since the amount of exhaust gas hardly changes before and after the addition of the treatment agent, an exhaust gas flowmeter is disposed together with the exhaust gas analyzer 132 in fig. 1, but the position of the exhaust gas flowmeter is not limited to this example. By analyzing the amount of exhaust gas, it is possible to calculate an analysis value obtained by analyzing the concentration of the acidic gas and the absolute amount of the acidic gas contained in the exhaust gas, and it is possible to calculate the mass of the treating agent to be determined with higher accuracy.
(treating agent supplying section)
The treating agent supply unit 14 supplies the treating agent in the amount indicated by the treating agent addition management unit 13 from the supply unit 12 to the exhaust gas treatment unit 11.
The treating agent supply unit 14 is not particularly limited as long as it can supply a predetermined amount of treating agent from the treating agent supply unit 12 to the exhaust gas treatment unit 11, and may be constituted by, for example, a constant feeder, a pump, or a powder feeder.
(treating agent)
The treating agent has a property of neutralizing an acid gas in the exhaust gas. The treatment agent may be in a liquid state or a powder state (solid state), but it is necessary to have a component capable of calculating the amount of the treatment agent to be added by analyzing the exhaust gas.
The treating agent is not particularly limited, and examples thereof include calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide, magnesium oxide, magnesium carbonate, calcium hydroxide-magnesium hydroxide, calcium oxide-magnesium oxide, calcium carbonate-magnesium carbonate, sodium hydroxide, sodium hydrogen carbonate, and sodium carbonate. One treating agent may be used alone, or two or more treating agents may be used simultaneously.
When a powdery treating agent is used as the treating agent, the average particle size of the treating agent is preferably 1 μm or more, more preferably 2 μm or more, and still more preferably 5 μm or more. By setting the average particle size of the treating agent to 1 μm or more, it is possible to prevent an increase in the pressure difference in the exhaust gas recovery unit 16 on the downstream side and to prevent an increase in the concentration of the acidic gas in the exhaust gas due to a decrease in the recovery efficiency. The average particle diameter of the treating agent is preferably 50 μm or less, more preferably 40 μm or less, and still more preferably 30 μm or less. By setting the average particle diameter of the treating agent to 50 μm or less, it is possible to ensure a sufficiently large specific surface area of the treating agent to be in contact with the exhaust gas.
(exhaust gas recovery section)
In the exhaust gas treatment system 1, an exhaust gas recovery unit 16 such as a bag filter is provided downstream of the exhaust gas treatment unit 11. The exhaust gas recovery unit 16 removes fly ash, which is a solid contained in the exhaust gas. When a part of the treating agent added to the exhaust gas treatment unit 11 is not used for the neutralization reaction of the exhaust gas treatment and remains in an unreacted state, the removed fly ash also contains the unreacted treating agent. In addition, the sulfur oxide, unreacted hydrogen chloride (HCl), sulfur oxide (SOx), and nitrogen oxide (NOx) after the reaction with the treating agent are also included. After a fixed time has elapsed, the fly ash collected by the exhaust gas recovery unit 16 is recovered and discharged to the outside.
(supply amount meter)
The treating agent addition management unit 13 may include a supply amount meter (not shown) downstream of the treating agent supply unit 14 and upstream of the exhaust gas treatment unit 11. The supply amount meter measures the amount of the treating agent supplied from the treating agent supply unit 14 to the exhaust gas treating unit 11.
(method of treating exhaust gas)
In the exhaust gas treatment method according to the present embodiment, the amount of addition of the treatment agent necessary for treating the acidic gas contained in the exhaust gas treated by the exhaust gas treatment unit 11 is calculated based on the amount of change in the oxygen concentration analyzed by the exhaust gas analysis units 131 and 132 of the treatment agent addition management unit 13 having the exhaust gas analysis units 131 and 132 for analyzing at least the oxygen concentration in the exhaust gas, the supply of the treatment agent in the calculated amount of addition is instructed to the treatment agent supply unit 14, and the treatment agent in the instructed amount of addition is supplied from the treatment agent storage unit 12 to the exhaust gas treatment unit 11 to treat the acidic gas contained in the exhaust gas, wherein the exhaust gas analysis units 131 and 132 are disposed on at least one of the upstream side and the downstream side of the exhaust gas recovery unit 16, and the exhaust gas recovery unit 16 separates the gas contained in the exhaust gas from the solid matter and recovers and removes the solid matter.
(operation of exhaust gas treatment System)
Here, the operation of the exhaust gas treatment method of the exhaust gas treatment system 1 will be described.
When the exhaust gas is a gas generated by burning waste in the incinerator F, the exhaust gas is treated through, for example, the following route. The exhaust gas generated in the incinerator F is cooled by passing through a flue and a desuperheating tower (both not shown), and fly ash is removed or recovered by the exhaust gas recovery unit 16. Thereafter, the exhaust gas is sent to the exhaust gas analyzing unit 132 of the treating agent addition managing unit 13 via the exhaust gas collecting unit 16. After the exhaust gas analyzing unit 132 analyzes the oxygen concentration in the exhaust gas, the treating agent addition managing unit 13 gives an instruction to add a treating agent in an amount necessary for treating the sulfur oxides contained in the exhaust gas in accordance with the fluctuation amount of the oxygen concentration. The sulfur oxides in the exhaust gas are neutralized in the exhaust gas treatment unit 11 by the treating agent supplied from the treating agent supply unit 12 in accordance with an instruction from the treating agent addition management unit 13. Next, the exhaust gas analyzer 132 analyzes the oxygen concentration, the sulfur oxide concentration, and the like, and after confirming that the sulfur oxide concentration of the exhaust gas is equal to or lower than a reference, the exhaust gas is discharged into the atmosphere through the stack 18. The fly ash removed by the exhaust gas recovery unit 16 is further treated by immobilizing and removing heavy metals and the like, and then is used for reclamation of land from sea.
(behavior of oxygen concentration)
In the present embodiment, the oxygen (O) in the exhaust gas is analyzed by the exhaust gas analyzer 132 2 ) And (4) concentration. Conventionally, in the treatment of an acidic gas in an exhaust gas with a treating agent, the concentration of the acidic gas, such as sulfur oxide (SOx), which is the target of neutralization, in the exhaust gas is analyzed. However, since a considerable time (for example, 4 minutes or more) is required until the acid gas (for example, sulfur oxide SOx) is analyzed by the exhaust gas analyzer 132 and a result is obtained, even if the exhaust gas is treated by adding an appropriate amount of the treating agent to the exhaust gas treatment unit based on the concentration of the acid gas of the analysis result, the treated exhaust gas is obtainedSince the concentration of the acid gas contained in (1) may fluctuate at the time of adding the treating agent, it cannot be said that the amount of the treating agent added is added in a constant appropriate amount, the concentration of the acid gas cannot be stably kept low, and the acid gas may temporarily rise and fluctuate to a high concentration.
As a result of intensive studies, the present inventors have found that there is a correlation between the concentration of the acid gas contained in the exhaust gas and the oxygen concentration, and that the acid gas concentration starts to increase and the oxygen concentration starts to decrease. Further, in the analysis of oxygen in the exhaust gas, since the time from the analysis to the result obtaining is shorter than the analysis time of the acid gas by half or less (for example, about 2 minutes), it is obvious that the analysis of the oxygen concentration in the exhaust gas is performed, and if the oxygen concentration starts to decrease, it is predicted that the acid gas starts to increase, and the necessary treatment agent is added to the exhaust gas treatment unit immediately in accordance with the decreasing rate of the oxygen concentration. Accordingly, in the present invention, instead of using the analysis result of the sulfur oxide concentration in the exhaust gas, an appropriate amount of the treating agent is added at the time point when the oxygen concentration in the exhaust gas starts to decrease based on the analysis result of the oxygen concentration in the exhaust gas, and the neutralization treatment of the sulfur oxide in the exhaust gas is performed, whereby the acid gas does not temporarily rise and fluctuate to a high concentration, and the concentration of the acid gas can be stably suppressed to be low.
The correlation between the oxygen concentration and the sulfur oxide concentration differs depending on the characteristics of the devices of the exhaust gas treatment system, the size of the devices, the state of the reaction that generates the exhaust gas, and the like. Therefore, the amount of the treating agent to be added for treating the acidic gas contained in the exhaust gas can be determined by preparing a calibration curve for each exhaust gas treatment system in advance, which is obtained by examining the relationship between the oxygen concentration and the sulfur oxide concentration, and taking the calibration curve into consideration together with the amount of the exhaust gas.
(analysis time of Sulfur oxide concentration)
In the analysis of the sulfur oxide concentration, the sulfur dioxide concentration is determined by utilizing the light absorption of sulfur dioxide, which is a main component of sulfur oxide, in the infrared region. Specifically, the absorption amount of infrared rays of sulfur dioxide in the vicinity of 7.3 μm was analyzed, and the concentration of sulfur dioxide contained in the exhaust gas was continuously analyzed. However, although the current analysis of sulfur oxides depends on the principle of analysis, it takes several minutes until the results are obtained, and at the minimum, it takes 4 minutes. The flue gas flows from the incinerator F to the chimney 18 through the flue gas recovery unit 11 according to the amount of time. Therefore, the exhaust gas to which the treatment agent is not supplied flows into the atmosphere until the result is obtained after the start of the analysis.
(analysis time of oxygen concentration)
Therefore, the exhaust gas treatment system 1 of the present embodiment does not analyze the sulfur oxide concentration in the exhaust gas, but analyzes and measures the oxygen concentration with attention paid to the oxygen in the exhaust gas. The analysis/measurement method can be performed by using a zirconia-type oxygen concentration meter and by performing analysis so as to be provided upstream or downstream of the exhaust gas analyzer 132 of the exhaust gas treatment system 1. Generally, in the oxygen concentration analysis, the analysis can be performed within 2 minutes by the zirconia system, and the analysis can be performed in a shorter time than the analysis of the concentration of sulfur oxide. Therefore, since the analysis time of the oxygen concentration meter can be set to a short time after the exhaust gas reaches the exhaust gas analyzer 132, the oxygen concentration is analyzed and an analysis value is obtained even on the downstream side of the exhaust gas recovery unit 16, and the treating agent supply unit 12 supplies the treating agent and the exhaust gas treatment unit 11 performs the treatment by issuing an instruction from the treating agent addition management unit 13 to the treating agent supply unit 12 in a short time. This reduces the amount of exhaust gas that is not neutralized by the treatment agent, and reduces the amount of exhaust gas that leaks into the atmosphere without being neutralized.
(utilization of change in oxygen concentration)
As described above, by utilizing both the time taken for the exhaust gas analyzer 132 to analyze the oxygen concentration and the sulfur oxide concentration to be analyzed and the time difference occurring in the behavior of the change in the oxygen concentration and the sulfur oxide concentration in the exhaust gas treatment system 1, it is possible to greatly reduce the exhaust gas that is not neutralized by the treatment agent and to reduce the exhaust gas that leaks into the atmosphere without being neutralized. Thus, by reducing as much as possible the delay time which cannot be dealt with the neutralization treatment of the sulfur oxides, it is possible to suppress leakage of the exhaust gas including the sulfur oxides from the stack.
(staged addition of treating agent)
Further, the mass of the acid gas treated per hour is determined from the amount of the exhaust gas and the sulfur oxide concentration, and the amount of the treating agent required is determined by multiplying the mass by the amount of the treating agent in consideration of the neutralization reaction with respect to the unit amount of the sulfur oxide. On the basis of this, the control of the addition of the treating agent to the exhaust gas is performed in a feed-forward control manner or a feedback control manner. Therefore, in the present embodiment, similarly to the conventional control method for analyzing the sulfur oxide concentration, the treatment of the sulfur oxide is controlled by incorporating logic for controlling the addition amount of the treating agent based on the change in the oxygen concentration analyzed by the exhaust gas analyzer 132 into the treating agent addition management unit 13.
However, the change in the oxygen concentration is gentler than the change in the sulfur oxide concentration. In addition, the change in the oxygen concentration indicates the starting point of the addition of the treating agent, but the oxygen concentration does not completely correspond to the sulfur oxide concentration. Therefore, it is preferable that the amount of the treatment agent to be added is changed stepwise in accordance with a change in the oxygen concentration, rather than completely in accordance with a change in the oxygen concentration. For example, when the oxygen concentration is decreased, the amount of the treating agent is not determined according to the decreased amount, but a large amount is added even when the treating agent is initially added. The amount of stepwise addition is determined in advance for the oxygen concentration. Then, when the tendency of decrease in the oxygen concentration becomes small, the amount of the treatment agent to be added is greatly reduced. By performing the stepwise processing in this way, the sulfur oxide neutralization processing can be performed in accordance with the oxygen concentration in the exhaust gas treatment system 1.
(exhaust gas analyzing section on upstream side)
Further, the exhaust gas analyzer 132 on the downstream side of the exhaust gas recovery unit 16 is used as the analysis value of the oxygen concentration, but the analysis value obtained by the analysis of the exhaust gas analyzer 131 on the upstream side of the exhaust gas recovery unit 16 may be managed by the treating agent addition manager 13. The treatment agent supply unit 12 is located at a distance/time closer to the position of the analysis exhaust gas, and is capable of adding a treatment agent more suitable for the exhaust gas.
Examples
The present invention will be described in more detail below based on examples. The present invention is not limited to these examples.
In order to neutralize and recover sulfur oxides in the exhaust gas by the exhaust gas recovery section, generally, the amount of sulfur oxides is analyzed after the exhaust gas recovery section. In the control of sulfur oxides, the amount of addition of the treating agent is controlled by a feedback control system such as PID based on the sulfur analysis result. Hitherto, in many cases, the sulfur oxide concentration is analyzed on the downstream side of the exhaust gas recovery portion, and the treating agent is supplied on the upstream side of the exhaust gas recovery portion based on the analysis result thereof. In order to compare the effects of the analyses on the oxygen concentration and the sulfur oxide concentration on the downstream side of the exhaust gas recovery unit, the transition of the sulfur oxide concentration and the consumption of slaked lime as a treatment agent when each concentration analysis was performed were analyzed.
Comparative example 1
As comparative example 1, in a plant equipped with the above-described exhaust gas treatment system, the sulfur oxide concentration was analyzed by the same exhaust gas treatment method as in the conventional art, and the exhaust gas treatment was performed.
Here, the addition of the treating agent is started by capturing the change in the sulfur oxide concentration regardless of the change in the oxygen concentration. Fig. 2 shows the sulfur oxide concentration and the time lapse of the addition of the treating agent at this time. In the analysis of the sulfur oxide concentration, the response time from the arrival of the exhaust gas at the analyzer in the analyzer using the infrared type sulfur oxide is several minutes, specifically about 240 seconds until 90% response. On the other hand, the oxygen concentration can be analyzed in the zirconia system so that the response time to 90% is about 120 seconds.
The exhaust gas flows to the exhaust gas treatment unit of the exhaust gas treatment system shown in fig. 1, and is treated with sulfur dioxide (SO) as sulfur oxide as shown in fig. 2 2 ) Slaked lime as a treating agent was added at the time point when the concentration started to increase. However, at the position of the exhaust gas analyzing section located on the downstream side of the exhaust gas recovering section, SO 2 The concentration begins to increase sharply. Then, when about 1 to 2 minutes have elapsed, SO 2 After the concentration has peaked, the effect of the addition of the treating agent begins to appear, SO 2 The concentration is reduced. From this, it was found that the addition of the treating agent to the exhaust gas treatment section did not cause SO contained in the exhaust gas 2 The concentration is fully processed. When the exhaust gas mixed with the treating agent comes to the exhaust gas analyzing section, the exhaust gas containing a large amount of sulfur oxides not treated with the treating agent is discharged/leaked into the atmosphere through a chimney for 1 to 2 minutes.
(example 1)
Then, oxygen (O) is trapped 2 ) The concentration is varied to add the treatment agent. O at this time is shown in FIG. 3 2 The passage of the concentration and the amount of the treating agent.
In example 1, SO contained in exhaust gas was analyzed in advance 2 Concentration and O 2 After the calibration curve is created for the concentration, a program for varying the amount of the treatment agent added in stages is introduced as follows, and a conventional control method and a method using a high value for the amount of the treatment agent added in the program are used. The relationship between the oxygen concentration (%) and the amount of slaked lime charged (kg/h) is shown in table 1.
[ Table 1]
As shown in fig. 3, after the exhaust gas was caused to flow for 1 minute, the oxygen concentration became less than 10%, at which time slaked lime was charged as a treating agent. However, in the exhaust gas analyzing section located on the downstream side of the exhaust gas recovering section, the exhaust gas having a high sulfur oxide concentration flows after 2 minutes from the time of the decrease in the oxygen concentration. Therefore, when the exhaust gas mixed with the treating agent reaches the exhaust gas analyzing section, the exhaust gas containing a large amount of sulfur oxides that have not been subjected to the neutralization treatment is discharged to the outside. However, the addition of the slaked lime is started before about 1 minute of the increase in the sulfur oxide concentration. Therefore, the peak of the sulfur oxide concentration is very low as compared with comparative example 1. Further, by changing the amount of addition of the slaked lime in stages with a change in the oxygen concentration, not continuously with a change in the oxygen concentration, although the amount of consumption of the slaked lime is slightly large, no untreated sulfur oxides are generated with respect to the sulfur oxides. Shows that: by these treatments, the discharge/leakage of the exhaust gas containing a large amount of sulfur oxides not treated with the treatment agent to the outside is very small.
However, it can be seen that: in example 1, the addition time is long and the amount of the slaked lime added is large because the slaked lime is added earlier than in comparative example 1. However, it is understood from this that the sulfur oxides in the exhaust gas can be sufficiently neutralized.
Further, it is understood from the slaked lime shown in fig. 2 and 3 that a fixed amount of the treating agent is always added in an actual exhaust gas treatment system regardless of the oxygen and sulfur oxide concentrations. Here, "addition of a treating agent" means addition of a large amount of the treating agent from the ordinary addition.
Description of the reference numerals
1: an exhaust gas treatment system; 11: an exhaust gas treatment unit; 12: a treating agent reservoir; 13: a treating agent addition management unit; 131. 132: an exhaust gas analysis unit; 14: a treating agent supply unit; 16: an exhaust gas recovery unit; 17: an exhaust gas flow meter; 18: a chimney; f: an incinerator.
Claims (5)
1. An exhaust gas treatment system is provided with:
an exhaust gas treatment unit for treating exhaust gas;
an exhaust gas recovery unit that separates and removes solid components from the exhaust gas treated by the exhaust gas treatment unit;
a treatment agent storage unit that stores a treatment agent for treating the exhaust gas;
a treating agent addition management unit that includes an exhaust gas analysis unit that is disposed on at least one of an upstream side and a downstream side of the exhaust gas recovery unit and that analyzes at least an oxygen concentration in the exhaust gas, and that calculates an addition amount of a treating agent necessary for treating an acidic gas contained in the exhaust gas treated by the exhaust gas treatment unit based on a variation amount of the oxygen concentration precipitated by the exhaust gas analysis unit and instructs supply of the treating agent in the calculated addition amount; and
and a treatment agent supply unit that supplies the treatment agent in the amount indicated by the treatment agent addition management unit from the treatment agent storage unit to the exhaust gas treatment unit.
2. The exhaust gas treatment system of claim 1,
the exhaust gas analyzer is disposed downstream of the exhaust gas recovery unit.
3. The exhaust gas treatment system according to claim 1 or 2,
the treating agent has the property of neutralizing acid gases in the exhaust gas.
4. The exhaust treatment system of any of claims 1-3,
the acid gas includes sulfur oxides.
5. An exhaust gas treatment method for treating an acidic gas contained in an exhaust gas by calculating an amount of a treating agent required for treating the acidic gas contained in the exhaust gas treated by an exhaust gas treatment unit based on a variation in the oxygen concentration analyzed by the exhaust gas analysis unit having a treating agent addition management unit for analyzing at least the oxygen concentration in the exhaust gas, instructing a treating agent supply unit to supply the calculated amount of the treating agent, and supplying the instructed amount of the treating agent from a treating agent storage unit to the exhaust gas treatment unit to treat the acidic gas contained in the exhaust gas, wherein the exhaust gas analysis unit is disposed on at least one of an upstream side and a downstream side of an exhaust gas recovery unit for separating a gas contained in the exhaust gas from solids and recovering and removing the solids.
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| PCT/JP2021/010019 WO2021210311A1 (en) | 2020-04-13 | 2021-03-12 | Exhaust gas treatment system and exhaust gas treatment method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000191306A (en) * | 1998-12-25 | 2000-07-11 | Sumitomo Metal Mining Co Ltd | Analysis system and production of sulfuric acid from refining waste gas using the same |
| JP2005199198A (en) * | 2004-01-16 | 2005-07-28 | Takuma Co Ltd | Method for controlling exhaust gas treatment facility |
| JP2010127598A (en) * | 2008-12-01 | 2010-06-10 | Mitsui Eng & Shipbuild Co Ltd | Treated object combustion system and method of controlling concentration of nitrogen oxide in exhaust gas |
| JP2019155260A (en) * | 2018-03-12 | 2019-09-19 | Ｊｆｅエンジニアリング株式会社 | Exhaust gas processing device and exhaust gas processing method |
| WO2019235110A1 (en) * | 2018-06-06 | 2019-12-12 | 日立造船株式会社 | Exhaust gas processing device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6199698B2 (en) * | 2013-11-01 | 2017-09-20 | 栗田工業株式会社 | Acid exhaust gas treatment method and exhaust gas treatment agent |
| JP6498626B2 (en) * | 2016-03-28 | 2019-04-10 | Ｊｘ金属株式会社 | Desulfurization agent addition control method |
| JP6998040B2 (en) * | 2017-10-06 | 2022-01-18 | 株式会社プランテック | Exhaust gas treatment equipment and exhaust gas treatment method |
| CN108862207A (en) * | 2018-07-23 | 2018-11-23 | 洛阳瑞昌环境工程有限公司 | A kind of sour gas wet process acid-making process combined with semidry method tail gas desulfurization |
| CN110756039B (en) * | 2019-11-29 | 2024-05-24 | 苏州仕净环保科技有限公司 | Flue gas desulfurization system with flue gas monitoring and regulating and controlling functions |
-
2020
- 2020-04-13 JP JP2020071552A patent/JP6984684B2/en active Active
-
2021
- 2021-03-12 WO PCT/JP2021/010019 patent/WO2021210311A1/en active Application Filing
- 2021-03-12 CN CN202180027835.4A patent/CN115427133B/en active Active
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000191306A (en) * | 1998-12-25 | 2000-07-11 | Sumitomo Metal Mining Co Ltd | Analysis system and production of sulfuric acid from refining waste gas using the same |
| JP2005199198A (en) * | 2004-01-16 | 2005-07-28 | Takuma Co Ltd | Method for controlling exhaust gas treatment facility |
| JP2010127598A (en) * | 2008-12-01 | 2010-06-10 | Mitsui Eng & Shipbuild Co Ltd | Treated object combustion system and method of controlling concentration of nitrogen oxide in exhaust gas |
| JP2019155260A (en) * | 2018-03-12 | 2019-09-19 | Ｊｆｅエンジニアリング株式会社 | Exhaust gas processing device and exhaust gas processing method |
| WO2019235110A1 (en) * | 2018-06-06 | 2019-12-12 | 日立造船株式会社 | Exhaust gas processing device |
Non-Patent Citations (1)
| Title |
|---|
| 蒋文举: "《烟气脱硫脱硝技术手册》", vol. 2009, 化学工业出版社, pages: 295 - 298 * |
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| TW202138718A (en) | 2021-10-16 |
| CN115427133B (en) | 2024-08-09 |
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| JP2021166976A (en) | 2021-10-21 |
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