WO2018101030A1 - Appareil de traitement de gaz d'échappement, et procédé de traitement de gaz d'échappement - Google Patents

Appareil de traitement de gaz d'échappement, et procédé de traitement de gaz d'échappement Download PDF

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Publication number
WO2018101030A1
WO2018101030A1 PCT/JP2017/040951 JP2017040951W WO2018101030A1 WO 2018101030 A1 WO2018101030 A1 WO 2018101030A1 JP 2017040951 W JP2017040951 W JP 2017040951W WO 2018101030 A1 WO2018101030 A1 WO 2018101030A1
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Prior art keywords
exhaust gas
chemical
gas treatment
supply
supply unit
Prior art date
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PCT/JP2017/040951
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English (en)
Japanese (ja)
Inventor
通孝 古林
武 片山
Original Assignee
日立造船株式会社
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Filing date
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Application filed by 日立造船株式会社 filed Critical 日立造船株式会社
Priority to PH1/2019/501181A priority Critical patent/PH12019501181B1/en
Priority to CN201780074663.XA priority patent/CN110022965A/zh
Priority to JP2018553755A priority patent/JP6955512B2/ja
Publication of WO2018101030A1 publication Critical patent/WO2018101030A1/fr

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    • 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
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • B01D53/70—Organic 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers

Definitions

  • the present invention relates to technology for treating exhaust gas and incineration equipment.
  • the present invention is directed to an exhaust gas treatment apparatus, and aims to efficiently perform a desalination treatment and appropriately cope with an abnormal time when the HCl concentration becomes a predetermined value or more.
  • An exhaust gas treatment apparatus includes a dust collector provided in a flue through which exhaust gas flows, and a temperature reducing tower that is provided between the generation source of the exhaust gas and the dust collector in the flue and sprays water into the exhaust gas. And a position between the generation source in the flue and the temperature reducing tower, or a position in the temperature reducing tower as a chemical supply position, and an exhaust gas treatment chemical containing a calcium-based chemical at the chemical supply position.
  • the supply amount of the exhaust gas treatment chemical is increased, or when the HCl concentration is equal to or higher than a predetermined value, the HCl concentration is supplied to the auxiliary supply position by the second chemical supply unit while supplying the exhaust gas treatment chemical.
  • a control unit that increases the supply amount of the exhaust gas treatment chemical to the chemical supply position by the first chemical supply unit more than when the value is less than the predetermined value.
  • the present invention it is possible to efficiently perform desalting and to appropriately cope with an abnormality in which the HCl concentration exceeds a predetermined value using the first drug supply unit or the second drug supply unit.
  • the first drug supply unit and the second drug supply unit share a storage unit that stores a calcium-based drug.
  • the second chemical supply unit supplies the dust collection ash collected by the dust collector as the exhaust gas treatment chemical.
  • An incineration facility includes a combustion chamber for burning waste, a flue for discharging exhaust gas generated in the combustion chamber from the combustion chamber, and the exhaust gas treatment device provided in the flue. .
  • the present invention is also directed to an exhaust gas treatment method in an exhaust gas treatment apparatus.
  • the exhaust gas treatment device is provided between a dust collector provided in a flue through which the exhaust gas flows, and the exhaust gas generation source and the dust collector in the flue, and water is contained in the exhaust gas.
  • a temperature-decreasing tower that sprays the water, a position between the generation source in the flue and the temperature-decreasing tower, or a position in the temperature-decreasing tower as a medicine supply position
  • a second chemical agent capable of supplying an exhaust gas treatment chemical containing a calcium-based chemical to a first chemical supply unit for supplying an exhaust gas treatment chemical containing a gas to an auxiliary supply position between the generation source and the dust collector in the flue
  • the exhaust gas treatment method includes: a) a position between the generation source and the temperature-decreasing tower in the flue, or in the temperature-decreasing tower, the exhaust gas by the first chemical supply unit.
  • the second chemical supply unit supplies the exhaust gas treatment chemical to the auxiliary supply position.
  • FIG. 1 is a diagram showing a configuration of an incineration facility 1 according to the first embodiment of the present invention.
  • the incineration facility 1 is a facility for incinerating waste such as municipal waste.
  • the incineration facility 1 includes a combustion chamber 2, a flue 3, an exhaust gas treatment device 4, an induction fan 51, and a chimney 52.
  • combustion chamber 2 combustion of garbage and combustion of combustible gas generated from the garbage are performed.
  • the flue 3 connects the combustion chamber 2 and the chimney 52.
  • the exhaust gas treatment device 4 and the induction fan 51 are provided in the flue 3.
  • the induction fan 51 discharges exhaust gas (combustion gas) generated in the combustion chamber 2 to the flue 3 and guides it to the chimney 52 through the exhaust gas treatment device 4.
  • the exhaust gas generated from the combustion chamber 2 flows through the flue 3 from the combustion chamber 2 toward the chimney 52, and the exhaust gas treatment device 4 performs a predetermined process on the exhaust gas.
  • the chimney 52 releases exhaust gas to the atmosphere.
  • the flue 3 is indicated by a thick solid line.
  • FIG. 2 is a diagram showing a configuration of the exhaust gas treatment device 4.
  • the exhaust gas treatment device 4 includes a temperature reducing tower 41, a chemical supply unit 42, a dust collector 43, an HCl concentration measurement unit 401, and a control unit 40.
  • a temperature reducing tower 41 and a dust collector 43 are sequentially provided from the combustion chamber 2 toward the chimney 52, that is, from the upstream side to the downstream side in the flow direction of the exhaust gas.
  • a denitration device or the like may be provided between the dust collector 43 and the chimney 52.
  • the temperature reducing tower 41 sprays water into the exhaust gas flowing from the combustion chamber 2 to lower the temperature of the exhaust gas.
  • the temperature of the exhaust gas discharged from the temperature reducing tower 41 is about 170 ° C., for example.
  • the drug supply unit 42 includes a slaked lime storage unit 421, a special auxiliary agent storage unit 422, a first drug pumping unit 423a, a second drug pumping unit 423b, a first drug supply line 424a, and a second drug supply line 424b. And fixed quantity supply parts 425 and 426.
  • the first drug supply line 424a is connected to the first drug pumping part 423a, and the other end is a position P1 between the combustion chamber 2 and the temperature reducing tower 41 in the flue 3 (hereinafter referred to as “drug supply position P1”). ").
  • medical agent pumping part 423a is an air blower, and sends air toward the flue 3 in the 1st chemical
  • One end of the second chemical supply line 424b is connected to the second chemical pumping unit 423b, and the other end is a position P2 between the temperature reducing tower 41 and the dust collector 43 in the flue 3 (hereinafter referred to as “auxiliary supply position P2”). Connected).
  • the second medicine pumping unit 423b is a blower and sends air toward the flue 3 in the second medicine supply line 424b.
  • the slaked lime storage unit 421 stores powdered slaked lime (calcium hydroxide (Ca (OH) 2 )) as a calcium (Ca) -based drug.
  • Slaked lime is a desalting and desulfurizing agent.
  • a fixed amount supply unit 425 is attached to the lower part of the slaked lime storage unit 421.
  • the fixed amount supply unit 425 is, for example, a table feeder having two discharge ports, and the two discharge ports are connected to the first drug supply line 424a and the second drug supply line 424b, respectively.
  • a set amount of slaked lime is taken out (cut out) from the slaked lime storage unit 421 per unit time. Thereby, slaked lime is supplied into the 1st chemical
  • the special auxiliary agent storage unit 422 stores a powdery drug (for example, Bag Ace (registered trademark) or activated carbon manufactured by Hitachi Zosen Corporation, hereinafter referred to as “special auxiliary agent”).
  • a fixed amount supply unit 426 is attached to the lower part of the special auxiliary agent storage unit 422.
  • the fixed amount supply unit 426 has two discharge ports like the fixed amount supply unit 425, and the two discharge ports are connected to the first drug supply line 424a and the second drug supply line 424b, respectively.
  • a set amount of special auxiliary agent is taken out from the special auxiliary agent storage unit 422 per unit time and supplied into the first drug supply line 424a and the second drug supply line 424b.
  • the chemical supply unit 42 configured as described above, it is possible to supply (blow) exhaust gas treatment chemicals including slaked lime and special auxiliary agents into the flue 3 at the chemical supply position P1 and the auxiliary supply position P2.
  • the exhaust gas treatment chemical may include other calcium-based chemicals (calcium-containing chemicals) such as dolomite hydroxide [Ca (OH) 2 .Mg (OH) 2 ] instead of or together with slaked lime (others) The same applies to the embodiment).
  • the first chemical supply unit 42a When the configuration for supplying the exhaust gas treatment chemical to the chemical supply position P1 is called a “first chemical supply unit 42a”, the first chemical supply unit 42a includes the slaked lime storage unit 421, the special auxiliary agent storage unit 422, and the first chemical agent. It includes a pumping unit 423a, a first medicine supply line 424a, and a fixed amount supply unit 425,426.
  • the second chemical supply unit 42b includes a slaked lime storage unit 421, a special auxiliary agent storage unit 422, It includes a second drug pumping unit 423b, a second drug supply line 424b, and a quantitative supply unit 425,426.
  • the slaked lime storage part 421 which stores slaked lime is shared, and the special adjuvant storage part 422 which stores a special adjuvant is also shared.
  • the dust collector 43 is, for example, a filtration type, and removes fly ash contained in the exhaust gas with a filter cloth.
  • the dust collector 43 is also called a bag filter.
  • the exhaust gas treatment chemical supplied by the chemical supply unit 42 is deposited on the filter cloth. When the exhaust gas passes through the filter cloth inside the dust collector 43, a reaction between the harmful substance contained in the exhaust gas and the exhaust gas treatment chemical occurs, and the harmful substance is removed from the exhaust gas. The reaction between the exhaust gas and the exhaust gas treatment chemical also occurs in the flue 3 upstream of the dust collector 43.
  • other types of exhaust gas treatment chemicals such as activated carbon may be supplied in addition to slaked lime. Examples of harmful substances removed by the exhaust gas treatment chemical include hydrogen chloride, sulfur oxides, dioxins, and mercury compounds.
  • fly ash and exhaust gas treatment chemicals including reactants with harmful substances deposited on the filter cloth are wiped out by backwashing using compressed air every predetermined time. Fly ash and exhaust gas treatment chemicals that have been wiped off from the filter cloth are conveyed to a dust collection ash treatment unit (not shown) and treated with, for example, a chelating agent (heavy metal stabilizer). Actually, part of the fly ash and the exhaust gas treatment chemical is also collected in the temperature reducing tower 41 provided between the combustion chamber 2 and the dust collector 43 in the flue 3 and transported to the fly ash treatment unit.
  • the HCl concentration measuring unit 401 is provided in the flue 3 between the combustion chamber 2 and the temperature reducing tower 41 (for example, in the vicinity of the inlet of the temperature reducing tower 41), and uses a laser beam or the like to measure hydrogen chloride in the exhaust gas.
  • the concentration (hereinafter referred to as “HCl concentration”) is measured.
  • the HCl concentration acquired by the HCl concentration measuring unit 401 is output to the control unit 40.
  • the controller 40 controls the drug supply unit 42 based on the HCl concentration.
  • the control unit 40 is also responsible for overall control of the exhaust gas treatment device 4.
  • FIG. 3 is a diagram showing the flow of exhaust gas treatment in the exhaust gas treatment device 4.
  • the HCl concentration measurement unit 401 measures the HCl concentration in the exhaust gas (step S11).
  • the exhaust gas treatment chemical containing slaked lime and special auxiliary agent is supplied to the chemical supply position P1 by the first chemical supply unit 42a (step S12).
  • the supply amount (supply amount per unit time) of the exhaust gas treatment chemical to the chemical supply position P1 can be controlled by adjusting the outputs of the first chemical pumping unit 423a and the quantitative supply units 425 and 426. It is.
  • control unit 40 when the HCl concentration acquired by the HCl concentration measuring unit 401 is higher than a predetermined set value, the supply amount of the exhaust gas treatment chemical to the chemical supply position P1 is increased, and the HCl concentration is set to the predetermined set value. If lower than that, the supply amount of the exhaust gas treatment chemical to the chemical supply position P1 is preferably reduced.
  • a reaction product (CaCl 2 ) of slaked lime and hydrogen chloride is formed on the surface. Since slaked lime flows into the temperature reducing tower 41 together with the exhaust gas, the moisture concentration on the surface of the slaked lime increases. Furthermore, the reactant on the surface having a high solubility in water is dissolved in the water sprayed into the temperature reducing tower 41, that is, is removed from the surface of the slaked lime, and unreacted slaked lime appears on the surface. Thereby, the fall of the reaction rate by the reaction material in the slaked lime surface is suppressed.
  • the efficiency of the desalting reaction is improved (the HCl concentration is reduced with less slaked lime). ) Is possible.
  • the exhaust gas treatment chemical contains another calcium chemical such as dolomite hydroxide, the reaction product with hydrogen chloride formed on the surface of the other calcium chemical is sprayed into the temperature reducing tower 41. And the decrease in reaction rate in the other calcium-based drug is suppressed.
  • the second chemical supply unit 42b supplies the exhaust gas treatment chemical including slaked lime and special auxiliary agent to the auxiliary supply position P2 (step S13).
  • the supply amount of the exhaust gas treatment chemical to the auxiliary supply position P2 can be controlled by adjusting the outputs of the second chemical pumping unit 423b and the quantitative supply units 425 and 426.
  • the control unit 40 the supply amount of the exhaust gas treatment chemical to the auxiliary supply position P2 is increased or decreased based on the HCl concentration.
  • the supply amount of the exhaust gas treatment chemical to the auxiliary supply position P2 by the second chemical supply unit 42b is increased more than when the HCl concentration is less than the predetermined value.
  • the control unit 40 causes the second chemical supply unit 42b to The supply amount of the exhaust gas treatment chemical to the auxiliary supply position P2 is increased.
  • step S13 when the HCl concentration is less than a predetermined value, the supply amount of the exhaust gas treatment chemical to the auxiliary supply position P2 by the second chemical supply unit 42b is 0 and the HCl concentration is equal to or higher than the predetermined value.
  • the supply of the exhaust gas treatment chemical to the auxiliary supply position P2 may be started when an abnormality occurs.
  • step S11 measurement of HCl concentration (step S11), supply of exhaust gas treatment chemical by the first chemical supply unit 42a (step S12), and supply of exhaust gas treatment chemical by the second chemical supply unit 42b (step S12).
  • Step S13) is in principle performed continuously in parallel with each other.
  • the supply of the exhaust gas treatment chemical to the chemical supply position P1 or the auxiliary supply position P2 may be temporarily stopped.
  • FIG. 4 is a diagram showing the relationship between the desalination rate and the equivalence ratio in the exhaust gas treatment apparatuses of the first and second comparative examples.
  • the exhaust gas treatment chemicals are adjusted so that the HCl concentration in the chimney 52 becomes a predetermined value. The supply amount was controlled.
  • the broken line L21 shows the relationship between the desalination rate and the equivalence ratio in the exhaust gas treatment device of the first comparative example
  • the solid line L22 shows the relationship between the desalination rate and the equivalence ratio in the exhaust gas treatment device of the second comparative example.
  • the equivalence ratio is a value of a ratio between the amount of slaked lime actually supplied and the amount of slaked lime theoretically necessary to completely remove hydrogen chloride and sulfur oxide in the exhaust gas. It is an index indicating the degree of excess.
  • the desalination rate is the ratio of the amount of hydrogen chloride removed by the exhaust gas treatment device to the amount of hydrogen chloride before treatment. For example, the desalting rate is obtained by (1- (amount of hydrogen chloride after desalting) / (amount of hydrogen chloride before desalting)).
  • an exhaust gas treatment chemical containing slaked lime is supplied to the chemical supply position P1 between the combustion chamber 2 and the temperature reducing tower 41 by the first chemical supply unit 42a.
  • desalination performance can be improved by using slaked lime efficiently.
  • the running cost can be reduced by the efficient use of slaked lime (reduction in the amount of slaked lime used). The same applies when the exhaust gas treatment chemical contains other calcium-based chemicals.
  • the supply amount of the exhaust gas treatment chemicals by the second chemical supply unit 42 b as well as the first chemical supply unit 42 a is increased at the time when the HCl concentration becomes a predetermined value or more. Accordingly, it is possible to appropriately cope with an abnormality, that is, it is possible to suppress a rapid increase in HCl concentration in a short time, and to stabilize the HCl concentration in the exhaust gas discharged from the chimney 52.
  • the exhaust gas treatment chemical can be efficiently used by controlling the first chemical supply unit 42a and the second chemical supply unit 42b based on the HCl concentration, and the running cost of the exhaust gas treatment device 4 can be reduced.
  • the first chemical supply unit 42a and the second chemical supply unit 42b share the slaked lime storage unit 421 that stores slaked lime, thereby simplifying the structure of the exhaust gas treatment device 4 (special The same applies to the auxiliary agent storage unit 422.)
  • FIG. 5 is a view showing an exhaust gas treatment device 4 according to the second embodiment of the present invention.
  • slaked lime storage units 421a and 421b for storing slaked lime are individually provided, and special auxiliary agent storage for storing special auxiliary agents.
  • the parts 422a and 422b are also provided individually.
  • the chemical supply position P1 is set in the temperature reduction tower 41, and the exhaust gas treatment chemical is supplied into the temperature reduction tower 41 by the first chemical supply unit 42a.
  • Other configurations are the same as those in FIG. 2, and the same reference numerals are given to the same configurations.
  • the first chemical supply unit 42a includes a slaked lime storage unit 421a, a special auxiliary agent storage unit 422a, a first chemical pumping unit 423a, a first chemical supply line 424a, and quantitative supply units 425a and 426a. Including. One end of the first medicine supply line 424a is connected to the first medicine pumping unit 423a, and the other end is connected to the medicine supply position P1.
  • the slaked lime in the slaked lime storage unit 421a is supplied into the first drug supply line 424a through the fixed amount supply unit 425a
  • the special auxiliary agent in the special auxiliary agent storage unit 422a is the first drug through the fixed amount supply unit 426a. It is supplied into the supply line 424a.
  • the exhaust gas treatment chemical containing slaked lime and special auxiliary agent is supplied to the chemical supply position P ⁇ b> 1 in the temperature reducing tower 41.
  • the second drug supply unit 42b includes a slaked lime storage unit 421b, a special auxiliary agent storage unit 422b, a second drug pumping unit 423b, a second drug supply line 424b, and quantitative supply units 425b and 426b.
  • One end of the second drug supply line 424b is connected to the second drug pumping unit 423b, and the other end is connected to the auxiliary supply position P2.
  • the slaked lime in the slaked lime storage unit 421b is supplied into the second drug supply line 424b via the fixed amount supply unit 425b, and the special auxiliary agent in the special auxiliary agent storage unit 422b is supplied to the second drug through the fixed amount supply unit 426b. It is supplied into the supply line 424b.
  • the exhaust gas treatment chemical containing slaked lime and special auxiliary agent is supplied to the auxiliary supply position P ⁇ b> 2 in the flue 3.
  • the supply amount of slaked lime to the drug supply position P1 and the slaked lime to the auxiliary supply position P2 The supply amount can be changed with a higher degree of freedom than the exhaust gas treatment device 4 of FIG. 2 (the same applies to the supply amount of the special auxiliary agent).
  • the supply amount of slaked lime by the first chemical supply unit 42a is larger than the supply amount of slaked lime by the second chemical supply unit 42b in normal times.
  • the chemical supply position P1 may be set upstream of the temperature reducing tower 41 in the flue 3 in the exhaust gas treatment device 4 of FIG.
  • the chemical supply position P ⁇ b> 1 may be set in the temperature reducing tower 41.
  • the HCl concentration is reduced by controlling both the first chemical supply unit 42 a and the second chemical supply unit 42 b based on the HCl concentration acquired by the HCl concentration measurement unit 401. It is possible to appropriately cope with an abnormality that exceeds a predetermined value.
  • a certain amount of exhaust gas treatment chemical is supplied to the chemical supply position P1 by the first chemical supply unit 42a, and only the supply amount of the exhaust gas treatment chemical to the auxiliary supply position P2 by the second chemical supply unit 42b is HCl. It may be controlled based on the concentration.
  • the supply amount of the exhaust gas treatment chemical to the auxiliary supply position P2 by the second chemical supply unit 42b is increased more than when the HCl concentration is less than the predetermined value at an abnormal time when the HCl concentration is equal to or higher than the predetermined value, It becomes possible to deal appropriately.
  • a certain amount of exhaust gas treatment chemical is supplied to the auxiliary supply position P2 by the second chemical supply unit 42b, and only the supply amount of the exhaust gas treatment chemical to the chemical supply position P1 by the first chemical supply unit 42a is based on the HCl concentration. It may be controlled. Also in this case, the first chemical supply is performed when the HCl concentration is less than the predetermined value while supplying the exhaust gas treatment chemical to the auxiliary supply position P2 by the second chemical supply unit 42b at the time of an abnormality in which the HCl concentration becomes a predetermined value or more. The supply amount of the exhaust gas treatment chemical to the chemical supply position P1 by the unit 42a can be increased to appropriately cope with it.
  • the first drug supply unit 42a and the second drug supply unit 42b include a drug storage unit
  • the first drug supply unit 42a and the second drug supply unit 42b are in an abnormal state when the HCl concentration becomes a predetermined value or more. While the exhaust gas treatment chemicals are supplied by both of them, the sum of the supply amounts of the exhaust gas treatment chemicals by both is increased as compared with the normal time when the HCl concentration is less than the predetermined value. This makes it possible to stabilize the HCl concentration in the exhaust gas (the same applies to the exhaust gas treatment device 4 in FIG. 2).
  • FIG. 6 is a view showing an exhaust gas treatment device 4 according to the third embodiment of the present invention.
  • a dust collection ash transport unit 44 is provided instead of the second chemical supply unit 42 b in the exhaust gas treatment device 4 of FIG. 5, and the chemical supply position P ⁇ b> 1 is a temperature reduction in the flue 3. It is set upstream of the tower 41.
  • the dust collection ash transport unit 44 includes an auxiliary path 441, a dust collection ash distribution unit 45, a dust collection ash storage unit 442, a quantitative supply unit 443, a supply conveyor 46, and a chute unit 444.
  • the auxiliary path 441 connects the position between the temperature reducing tower 41 and the dust collector 43 in the flue 3 (that is, the auxiliary supply position P ⁇ b> 2) and the lower portion of the dust collector 43. In FIG. 6, the auxiliary path 441 is indicated by a thin solid line. The auxiliary path 441 is a path different from the flue 3.
  • a dust collection ash distribution unit 45 In the auxiliary path 441, a dust collection ash distribution unit 45, a dust collection ash storage unit 442, a fixed amount supply unit 443, a supply conveyor 46, and a chute unit 444 are provided in order from the dust collector 43 toward the auxiliary supply position P2.
  • the dust collection ash distribution unit 45 collects the fly ash and exhaust gas treatment chemicals (hereinafter collectively referred to as “dust collection ash”) that have been removed from the filter cloth in the dust collector 43 and the dust collection ash storage unit 442 and the dust collection unit. Distribute and supply to the ash treatment unit 49.
  • the dust collection ash distribution unit 45 includes a conveyor 451 and a gate 452.
  • the conveyor 451 is, for example, a flight conveyor (also called a scraper conveyor).
  • the gate 452 is provided in the dust collection ash conveyance path by the conveyor 451.
  • the gate 452 When the amount of dust collection ash stored by the level meter (not shown) in the dust collection ash storage unit 442 is less than a predetermined amount, the gate 452 is opened and the dust collection ash is supplied to the dust collection ash storage unit 442. Is done. When the amount of dust collection ash stored in the dust collection ash storage unit 442 is greater than or equal to a predetermined amount, the gate 452 is closed and the dust collection ash is supplied to the dust collection ash processing unit 49. Thus, in the dust collection ash distribution unit 45, the dust collection ash from the dust collector 43 is collected by opening and closing the gate 452 so that the amount of dust collection ash stored in the dust collection ash storage unit 442 is approximately constant. It is distributed to the storage unit 442 and the dust collection ash processing unit 49.
  • a fixed amount supply unit 443 is attached to the lower part of the dust collection ash storage unit 442.
  • the fixed amount supply unit 443 is, for example, a table feeder, and takes out a set amount of dust collection ash from the dust collection ash storage unit 442 per unit time.
  • the fixed amount supply unit 443 is connected to the supply conveyor 46, and the dust collection ash taken out from the dust collection ash storage unit 442 is supplied into the supply conveyor 46.
  • the supply conveyor 46 is a flight conveyor, for example, and conveys the dust collection ash along a conveyor conveyance path from below the dust collection ash storage unit 442 to above the auxiliary supply position P ⁇ b> 2 in the flue 3.
  • the conveyor conveyance path is a part of the auxiliary path 441 described above.
  • the chute part 444 is provided above the auxiliary supply position P2, and the dust collection ash conveyed by the supply conveyor 46 is supplied to the auxiliary supply position P2 via the chute part 444.
  • the dust collection ash contains the exhaust gas treatment chemical. Therefore, it can be said that the dust collection ash transport unit 44 is a second chemical supply unit capable of supplying an exhaust gas treatment chemical containing slaked lime to the auxiliary supply position P2.
  • the control of the first chemical supply unit 42a and the dust collection ash transport unit 44 by the control unit 40 is the same as the control for the first chemical supply unit 42a and the second chemical supply unit 42b in the exhaust gas treatment device 4 of FIGS. is there. Therefore, when the HCl concentration is equal to or higher than the predetermined value, the supply amount of the dust collection ash to the auxiliary supply position P2 by the dust collection ash transport unit 44 is increased more than when the HCl concentration is less than the predetermined value.
  • the first chemical supply unit 42a is supplied more than when the HCl concentration is less than the predetermined value while supplying the dust collection ash to the auxiliary supply position P2 by the dust collection ash transport unit 44.
  • the amount of the exhaust gas treatment chemical supplied to the chemical supply position P1 is increased.
  • the unused exhaust gas treatment chemical is supplied to the chemical supply position P1 between the combustion chamber 2 and the temperature reducing tower 41 by the first chemical supply unit 42a. .
  • the dust collection ash transport unit 44 supplies dust collection ash containing slaked lime to the auxiliary supply position P2.
  • the first chemical supply unit 42a supplies the exhaust gas treatment chemical by the first chemical supply unit 42a and supplies the dust collection ash by the dust collection ash transport unit 44.
  • Both or one of the supply amount of the exhaust gas treatment chemical by and the supply amount of dust collection ash by the dust collection ash transport unit 44 is increased from the normal time when the HCl concentration is less than a predetermined value. Thereby, it is possible to appropriately cope with an abnormality.
  • the dust collection ash transport unit 44 the dust collection ash may be transported to the auxiliary supply position P2 using a carrier gas such as air.
  • a carrier gas such as air.
  • the chemical supply position P1 may be set in the temperature reduction tower 41, and the exhaust gas treatment chemical may be supplied into the temperature reduction tower 41 by the first chemical supply unit 42a (described later). The same applies to the exhaust gas treatment device 4 of FIGS. 7 and 8).
  • FIG. 7 is a view showing an exhaust gas treatment device 4 according to the fourth embodiment of the present invention.
  • the auxiliary supply position P ⁇ b> 2 in the exhaust gas treatment device 4 of FIG. 6 is upstream of the temperature reduction tower 41 in the flue 3, that is, between the combustion chamber 2 and the temperature reduction tower 41. Is set.
  • Other configurations are the same as those of the exhaust gas treatment apparatus 4 of FIG. 6, and the same components are denoted by the same reference numerals.
  • dust collection ash conveyance part 44 reduces the usage-amount of the waste gas processing chemical
  • both or one of the supply amount of the exhaust gas treatment chemical by the first chemical supply unit 42a and the supply amount of the dust collection ash by the dust collection ash transport unit 44 are changed to the HCl concentration. Is increased from the normal time when it is less than the predetermined value, it is possible to appropriately cope with an abnormal time.
  • the auxiliary supply position P2 On the road 3 it is only necessary to be provided between the combustion chamber 2, which is a source of exhaust gas, and the dust collector 43.
  • FIG. 8 is a view showing an exhaust gas treatment device 4 according to the fifth embodiment of the present invention.
  • two auxiliary supply positions P ⁇ b> 2 are set in the dust collection ash transport unit 44.
  • One auxiliary supply position P ⁇ b> 2 is between the combustion chamber 2 and the temperature reduction tower 41 in the flue 3
  • the other auxiliary supply position P ⁇ b> 2 is between the temperature reduction tower 41 and the dust collector 43.
  • a supply conveyor 47 and a chute 445 are added to the dust collection ash transport unit 44 in FIG. 6.
  • the supply conveyor 47 is connected to a predetermined position of the supply conveyor 46, and continues from the position above the one auxiliary supply position P2.
  • dust ash can be supplied to the one auxiliary supply position P ⁇ b> 2 using a part of the supply conveyor 46, the supply conveyor 47 and the chute 445.
  • Dust ash can be supplied to the other auxiliary supply position P ⁇ b> 2 using the supply conveyor 46 and the chute 444.
  • the dust collection ash transport unit 44 supplies the dust collection ash containing slaked lime to the flue 3 as the second chemical supply unit, whereby the exhaust gas treatment in the first chemical supply unit 42a.
  • the amount of medicine used can be reduced. Further, at the time of an abnormality in which the HCl concentration exceeds a predetermined value, both or one of the supply amount of the exhaust gas treatment chemical by the first chemical supply unit 42a and the supply amount of the dust collection ash by the dust collection ash transport unit 44 are increased. Therefore, it is possible to cope with it appropriately.
  • the HCl concentration measurement unit 401 may be provided in the flue 3 between the temperature reducing tower 41 and the dust collector 43 (for example, at the inlet of the dust collector 43), or may be provided between the dust collector 43 and the chimney 52. .
  • the chimney 52 is usually provided with another HCl concentration measurement unit. However, by providing the HCl concentration measurement unit 401 on the upstream side of the chimney 52, it is possible to quickly cope with fluctuations in the HCl concentration of the exhaust gas. Become. Or supply_amount
  • medical agent may be controlled using the HCl concentration measurement part provided in the chimney 52 (it may be taken as a part of flue).
  • the exhaust gas treatment device 4 may be used in facilities other than the incineration facility 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treating Waste Gases (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

L'appareil de traitement de gaz d'échappement selon la présente invention comprend : un collecteur de poussière disposé sur un carneau; une tour de réduction de température pour pulvériser de l'eau dans un gaz d'échappement, la tour de réduction de température étant disposée entre le collecteur de poussière et une chambre de combustion dans le carneau; une première unité d'alimentation en produit chimique pour fournir un produit chimique de traitement de gaz d'échappement comprenant un produit chimique à base de calcium à une position entre la tour de réduction de température et la chambre de combustion dans le carneau; une seconde unité d'alimentation en produit chimique apte à fournir le produit chimique de traitement de gaz d'échappement comprenant un produit chimique à base de calcium à une position d'alimentation auxiliaire entre le collecteur de poussière et la chambre de combustion dans le carneau; une unité de mesure de concentration en HCl pour mesurer la concentration en HCl dans le gaz d'échappement; et une unité de contrôle pour augmenter la quantité de produit chimique de traitement de gaz d'échappement fourni par la première unité d'alimentation en produit chimique ou la seconde unité d'alimentation en produit chimique à une quantité supérieure à la quantité de celui-ci au moment où la concentration en HCl est inférieure à une valeur prédéterminée lorsque la concentration en HCl est égale ou supérieure à la valeur prédéterminée. Le traitement de dessalement est ainsi réalisé avec une bonne efficacité, et il est possible de répondre de manière appropriée en cas d'anomalie dans laquelle la concentration en HCl est égale ou supérieure à la valeur prédéterminée.
PCT/JP2017/040951 2016-12-02 2017-11-14 Appareil de traitement de gaz d'échappement, et procédé de traitement de gaz d'échappement WO2018101030A1 (fr)

Priority Applications (3)

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PH1/2019/501181A PH12019501181B1 (en) 2016-12-02 2017-11-14 Exhaust gas treatment apparatus, incineration facility, and exhaust gas treatment method
CN201780074663.XA CN110022965A (zh) 2016-12-02 2017-11-14 废气处理装置、焚烧设备和废气处理方法
JP2018553755A JP6955512B2 (ja) 2016-12-02 2017-11-14 排ガス処理装置、焼却設備および排ガス処理方法

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JPWO2018101030A1 (ja) 2019-10-17

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