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WO2016136714A1 - Appareil pour traiter des gaz de fumée - Google Patents

Appareil pour traiter des gaz de fumée Download PDF

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Publication number
WO2016136714A1
WO2016136714A1 PCT/JP2016/055190 JP2016055190W WO2016136714A1 WO 2016136714 A1 WO2016136714 A1 WO 2016136714A1 JP 2016055190 W JP2016055190 W JP 2016055190W WO 2016136714 A1 WO2016136714 A1 WO 2016136714A1
Authority
WO
WIPO (PCT)
Prior art keywords
mercury
exhaust gas
combustion exhaust
atomic
amount
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/055190
Other languages
English (en)
Japanese (ja)
Inventor
通孝 古林
博光 橋本
彰浩 臼谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kanadevia Corp
Original Assignee
Hitachi Zosen Corp
Hitachi Shipbuilding and Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Zosen Corp, Hitachi Shipbuilding and Engineering Co Ltd filed Critical Hitachi Zosen Corp
Priority to JP2016568700A priority Critical patent/JP6173621B2/ja
Priority to CN201680011880.XA priority patent/CN107249717A/zh
Publication of WO2016136714A1 publication Critical patent/WO2016136714A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • F23G5/05—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying using drying grates
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/10—Arrangement of sensing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/60—Heavy metals; Compounds thereof

Definitions

  • the present invention relates to a combustion exhaust gas treatment device, and more particularly to a combustion exhaust gas treatment device for removing mercury from combustion exhaust gas.
  • the combustion exhaust gas generated when burning waste or coal may contain mercury.
  • the form of mercury in combustion exhaust gas is roughly classified into zero-valent atomic mercury and divalent mercury constituting various mercury compounds such as soluble mercury salts. From the viewpoint of preventing air pollution, it is necessary to monitor mercury discharge to the environment and detect and deal with it early if mercury concentration in combustion exhaust gas increases abnormally.
  • waste that is incinerated on a daily basis contains almost no mercury.
  • the mercury concentration in the combustion exhaust gas does not normally reach a problematic level even without special mercury countermeasures. Therefore, in special cases, for example, when waste containing mercury is dumped into the incinerator's garbage pit and the amount of mercury in the combustion exhaust gas rises rapidly, this is detected early, and when there is such detection It is only necessary to take special mercury removal measures to remove mercury from the flue gas.
  • the mercury removal device described in JP2014-213308A includes a mercury continuous analyzer for detecting the concentration of mercury contained in exhaust gas flowing through a flue, and a mercury concentration detected by the mercury continuous analyzer exceeds a predetermined concentration. And a means for opening a path for introducing activated carbon for adsorption of mercury into the flue.
  • the continuous mercury analyzer reduces various mercury compounds such as soluble mercury salt in combustion exhaust gas to atomic mercury, and then reduces the reduced atomic mercury and atomic mercury originally present in the combustion exhaust gas. The total concentration of is detected.
  • the object of the present invention is to solve such problems and to start the mercury removal process quickly when the mercury concentration in the combustion exhaust gas rises.
  • the flue gas treatment apparatus of the present invention comprises: An atomic mercury detection device that detects the amount of zero-valent atomic mercury contained in combustion exhaust gas and does not detect the amount of divalent mercury that constitutes a mercury compound such as soluble mercury salt contained in the combustion exhaust gas.
  • a mercury-removing chemical introduction device for introducing a chemical for removing mercury into the combustion exhaust gas when the detection device detects that atomic mercury exceeds a specified amount.
  • the apparatus for treating exhaust gas of the present invention since it is not intended to detect the amount of divalent mercury, it is not necessary to reduce the divalent mercury to zero-valent atomic mercury, and the mercury removal correspondingly. The process can be started quickly.
  • the mercury-removing chemical input device inputs activated carbon as a chemical for removing mercury into the combustion exhaust gas.
  • the mercury removal chemical introduction device has the first introduction device for introducing the atomic mercury removal chemical for removing zero-valent atomic mercury into the combustion exhaust gas. It can also be configured.
  • the mercury removing chemical charging device is soluble in the first charging device for charging the atomic mercury removing chemical for removing zero-valent atomic mercury into the exhaust gas. It can also be configured to have a second charging device for charging a divalent mercury removing agent for removing divalent mercury constituting a mercury compound such as a mercury salt into the combustion exhaust gas.
  • the combustion exhaust gas treatment apparatus of the present invention It further has another mercury detection device that detects the amount of mercury contained in the combustion exhaust gas,
  • the second input device may be configured to input a divalent mercury removing agent into the combustion exhaust gas when the other mercury detection device detects that the mercury exceeds the specified amount.
  • the atomic mercury detection device is provided upstream of the mercury removal agent charging device in the combustion exhaust gas passage.
  • the other mercury detection device is provided on the downstream side or the upstream side of the device for introducing the divalent mercury removing agent in the combustion exhaust gas passage.
  • a dust collector is provided in the combustion exhaust gas flow path
  • the atomic mercury removing chemical injection device may be one that inputs the atomic mercury removing chemical into the combustion exhaust gas upstream of the dust collection device in the combustion exhaust gas flow path, immediately before the dust collection device or in the dust collection device. preferable.
  • a dust collector is provided in the combustion exhaust gas flow path
  • the first input device is for supplying the atomic mercury removing agent into the combustion exhaust gas upstream of the dust collector in the combustion exhaust gas flow path, immediately before the dust collector or in the dust collector
  • the second input device may be configured to input the divalent mercury removing agent into the combustion exhaust gas upstream of the dust collection device in the combustion exhaust gas flow path, immediately before the dust collection device or in the dust collection device. it can.
  • a wet gas scrubber is provided in the flue gas flow path, and the mercury removing agent charging device is a wet gas scrubber to which a chelating agent for removing mercury is added. It is preferable that the washing water for reacting with the combustion exhaust gas.
  • the mercury removal chemical injection device burns cleaning water for a wet gas cleaning device to which a chelating agent for removing zero-valent atomic mercury is added. It can also be set as the structure made to react with waste gas.
  • Atomic mercury removal chemical injection device A first input device for reacting a first cleaning water for a wet gas cleaning device, to which a chelating agent for removing zero-valent atomic mercury is added, with combustion exhaust gas; A second charging device for reacting the second cleaning water for the wet gas cleaning device, to which a chelating agent for removing divalent mercury is added, with the combustion exhaust gas may be used.
  • the combustion exhaust gas treatment apparatus of the present invention It further has another mercury detection device that detects the amount of mercury contained in the combustion exhaust gas,
  • the second charging device may be configured to react the second washing water with the combustion exhaust gas when the other mercury detection device detects that the mercury exceeds the specified amount.
  • the atomic mercury detection device can be configured to detect the amount of atomic mercury contained in the gas above the dry grate in the combustion furnace.
  • the atomic mercury detection device includes a sampling path communicating with the combustion exhaust flow path, a mercury analyzer connected to the sampling path, a combustion exhaust flow path in the sampling path, It is preferable to have a dust filter provided between the mercury analyzer.
  • the dust filter is preferably a filter through which combustion exhaust gas at 150 ° C. or higher passes.
  • the mercury detector of the present invention for detecting mercury contained in combustion exhaust gas, Having an analyzer that detects the amount of zero-valent atomic mercury contained in the flue gas, There is no function to reduce mercury compounds composed of divalent mercury such as soluble mercury salts contained in combustion exhaust gas to atomic mercury, The amount of zero-valent atomic mercury contained in the combustion gas is detected, and the amount of mercury compound composed of divalent mercury such as soluble mercury salt contained in the combustion exhaust gas is not detected.
  • the analyzer is configured to detect only the amount of atomic mercury in both the atomic mercury contained in the combustion exhaust gas and the mercury compound such as soluble mercury salt. can do.
  • the atomic mercury detection device detects the amount of zero-valent atomic mercury contained in the combustion exhaust gas, and a mercury compound such as a soluble mercury salt contained in the combustion exhaust gas. Since the amount of divalent mercury that constitutes is not detected, it does not require time for reducing divalent mercury to zero-valent atomic mercury. For this reason, when the mercury concentration in the combustion exhaust gas rises rapidly, this can be detected quickly and a mercury removing agent can be immediately introduced. Therefore, the mercury removal process can be started quickly when the mercury concentration in the combustion exhaust gas increases.
  • the mercury detector of the present invention has an analyzer for detecting the amount of zero-valent atomic mercury contained in the combustion exhaust gas, and is composed of divalent mercury such as soluble mercury salt contained in the combustion exhaust gas. It does not have a function to reduce the generated mercury compounds to atomic mercury. It detects the amount of zero-valent atomic mercury contained in the combustion gas and converts it into divalent mercury such as soluble mercury salt contained in the combustion exhaust gas. Since the amount of the mercury compound configured in this way is not detected, when the mercury concentration in the combustion exhaust gas rises rapidly, this can be detected quickly.
  • FIG. 4A It is a figure which shows schematic structure of the processing apparatus of the combustion exhaust gas of other embodiment of this invention. It is a figure which shows schematic structure of the processing apparatus of the combustion exhaust gas of further another embodiment of this invention. It is a figure which shows schematic structure of the processing apparatus of the combustion exhaust gas of further another embodiment of this invention.
  • reference numeral 11 denotes a combustion furnace of a waste incinerator, which includes a waste input port 12, an incineration unit 13, a combustion exhaust gas discharge port 14, and an ash discharge port 15.
  • Reference numeral 16 denotes a flue from the exhaust gas exhaust port 14, that is, an exhaust gas path
  • 17 denotes a chimney.
  • combustion exhaust gas has already been generated in the incinerator 13 of the combustion furnace 11, and therefore, the range from the portion where the combustion exhaust gas is generated in the incinerator 13 to the exhaust port of the chimney 17 has a wide meaning. Constitutes the combustion exhaust gas flow path 18.
  • the exhaust gas path 16 is provided with a bag filter 19 as a dust collector for collecting dust in the combustion exhaust gas.
  • a bag filter 19 as a dust collector for collecting dust in the combustion exhaust gas.
  • an input port 20 for supplying activated carbon as a mercury removing agent is provided at the position upstream of the filter portion of the bag filter 19 in the exhaust gas path 16.
  • Reference numeral 21 denotes an activated carbon tank which can store activated carbon capable of adsorbing mercury in the combustion exhaust gas, and can supply the activated carbon to the inlet 20 via the valve 22.
  • the tank 21, the valve 22, and the charging port 20 constitute a mercury removing chemical charging device.
  • the mercury detection device 25 is a mercury detector that can continuously detect whether or not a large amount of mercury is contained in the combustion exhaust gas.
  • the mercury detection device 25 includes a mercury analysis device 26 for analyzing the amount of mercury, a sample gas intake unit 27, and a sampling path 28 for sending the sample gas acquired by the intake unit 27 to the mercury analysis device 26. .
  • the control device 29 is a control device that adjusts the opening of the valve 22 based on the detection result of the mercury detection device 25.
  • the control device 29 is connected to a detection signal line 30 from the mercury analyzer 26 of the mercury detector 25 and a control signal line 31 to the valve 22.
  • the combustion furnace 11 includes a feeding device 34 for feeding the garbage 33 introduced from the garbage inlet 12 to the incineration unit 13.
  • the incinerator 13 is provided with a dry grate 35, a combustion grate 36, and a post-combustion grate 37 in this order.
  • the take-in part 27 of the mercury detector 25 is preferably provided at a position upstream of the activated carbon inlet 20 in the combustion exhaust gas passage 18 of FIG.
  • the incinerator 11 is provided at a position above the dry grate 35 in the installation location of the dry grate 35.
  • the exhaust gas contains a large amount of mercury in the atomic state. This is because mercury having a boiling point of about 350 ° C. evaporates and contained in the exhaust gas in large quantities due to the high temperature state, so that mercury can be easily detected without any obstacles.
  • the intake portion 27 of the mercury detection device 25 is located at a position near the exhaust port 14 of the combustion exhaust gas of the incinerator 11, the exhaust port 14 in the exhaust gas path 16, or a position upstream of the bag filter 19 in the exhaust gas path 16. It can also be suitably installed at a location where the combustion exhaust gas temperature is in the range of 300 to 150 ° C.
  • a dust filter 38 as a pretreatment device in the sampling path 28 of the mercury detection device 25.
  • the reason is that it is difficult to perform measurement by the mercury analyzer 26 under the condition where dust is present.
  • the sample gas is supplied to the mercury analyzer 26 with the dust removed by the filter 38.
  • the illustrated dust filter 38 has a function of backwashing with air, and is connected with a backwashing air pipe 39.
  • the air pipe 39 is provided with a valve 40 for adjusting the flow rate of the backwash air.
  • FIG. 4A shows the configuration of the mercury analyzer 26.
  • the sampling path 28 is directly guided to the analysis unit 41.
  • the analysis unit 41 can detect zero-valent atomic mercury, but cannot detect divalent mercury constituting a mercury compound such as a soluble mercury salt such as mercury chloride soot.
  • a mercury compound such as a soluble mercury salt contained in the sample gas is converted into atomic mercury as in the known mercury detector shown in FIG. 4B.
  • No reduction catalyst 42 is used for reduction. Therefore, both atomic mercury and a mercury compound such as a soluble mercury salt are sent to the analysis unit 41.
  • the analysis unit 41 only detects the amount of atomic mercury alone.
  • the sampling path 28 can be provided with a device that removes components harmful to the analysis unit 41, such as hydrogen chloride, contained in the sample gas.
  • the analysis part 41 it can detect immediately that the amount of detected mercury increased rapidly by detecting only atomic mercury in the state which does not require the time for reducing a mercury compound to atomic mercury. . Then, the detection signal is sent to the control device 29. Upon receiving the detection signal, the control device 29 opens the valve 22 and injects the activated carbon in the tank 21 into the combustion exhaust gas flow path, for example, to adsorb mercury. . As a result, when the amount of mercury in the combustion exhaust gas increases rapidly, adsorption removal can be performed quickly.
  • the sample gas passing through the filter 38 is set to a state of 150 ° C. or higher.
  • the filter 38 performs backwashing by periodically opening the valve 40 in order to remove accumulated dust.
  • the sample gas passing through the filter 38 is in a state of 100 ° C. or higher.
  • the activated carbon from the tank 21 can remove more mercury if it is charged in a later process. For this reason, it is more preferable to supply mercury into the bag filter 19 as the same flue gas flow path 18 than to enter the flue portion upstream of the bag filter 19 as the flue gas flow path 18. The amount of adsorption can be increased. The removal of mercury by the activated carbon proceeds on the filter cloth of the bag filter 19 that has captured the activated carbon. When it is difficult to put activated carbon into the bag filter 19, it is put into the portion of the exhaust gas path 16 immediately before the bag filter 19.
  • the term “immediately before” here means a position as close to the bug filter as possible for the above-described reason. The same can be said for the charging position of the above-mentioned activated carbon in other embodiments described later using activated carbon.
  • the input amount of activated carbon is suitably from 0.01 to 10 g / m 3 N.
  • the amount of mercury emitted is not a problem even if activated carbon is not used in normal times, but the mercury amount increased rapidly, for example, the mercury amount increased by 0.01 mg / m 3 N or more within 1 minute. Sometimes this amount of activated carbon is required. If a small amount of mercury continues to be generated, the opening degree of the valve 22 can be adjusted to be small, and a small amount of activated carbon can be continuously charged accordingly. What is necessary is just to increase the quantity.
  • the generated mercury contains zero-valent atomic mercury and divalent mercury constituting a mercury compound such as a soluble mercury salt.
  • the existence ratio of divalent mercury is about 90% by mass, and zero-valent mercury is about 10% by mass.
  • Divalent mercury can be adsorbed and removed by an appropriate amount of activated carbon.
  • zero-valent mercury can be adsorbed and removed by supplying a larger amount of activated carbon than in the case of divalent mercury.
  • the input amount of the above-mentioned activated carbon is an amount necessary for removing both divalent mercury and zero-valent mercury.
  • the mercury removing agent introduction device removes mercury by introducing a chelating agent instead of the above-mentioned activated carbon. That is, the activated carbon tank 21 is not installed in the combustion exhaust gas treatment apparatus shown in FIG. Instead, a wet gas cleaning device 43 is installed at a position downstream of the bag filter 19 in the combustion exhaust gas passage 18.
  • Reference numeral 44 denotes a chelate tank which can store a chelating agent capable of forming a chelate complex taking in mercury in combustion exhaust gas, and can put this chelating agent into the gas cleaning device 43 through a valve 45.
  • a control signal line 31 from the control unit 29 is led to the valve 45.
  • a chelating agent is added to the cleaning water of the gas cleaning device 43, and the cleaning water to which the chelating agent is added reacts with mercury in the combustion exhaust gas, whereby the chelate complex that takes in mercury is obtained. It will be formed and collected.
  • the mercury removal chemical injection device is a zero-valent atom by activated carbon that inherently adsorbs and removes divalent mercury constituting a mercury compound such as a soluble mercury salt. It also adsorbs and removes mercury. Since zero-valent atomic mercury is difficult to be adsorbed by ordinary activated carbon, a necessary amount of adsorption is ensured by adding a large amount of activated carbon, and thereby adsorbed and removed together with divalent mercury.
  • the mercury removal chemical introduction device introduces the zero-valent mercury removal chemical that can efficiently and quickly remove the zero-valent atomic mercury into the combustion exhaust gas. It can also be configured.
  • the zero-valent mercury removing agent may be capable of removing divalent mercury.
  • FIG. 6 shows an example of a combustion exhaust gas treatment apparatus having such a configuration.
  • the intake 27 of the mercury detector 25 equipped with the mercury analyzer 26 is provided in the portion of the exhaust gas path 16 in the vicinity of the combustion exhaust gas outlet 14 of the incinerator 11.
  • the combustion exhaust gas discharge port 14 corresponds to the exhaust port from the boiler. This also applies to the embodiments shown in FIGS. 1 to 5 described above.
  • an activated carbon tank 52 for removing atomic mercury in place of the activated carbon tank 21 in the processing apparatus shown in FIG. 53 is an inlet for the activated carbon to the exhaust gas path 16.
  • the activated carbon for removing atomic mercury stored in the tank 52 exclusively removes zero-valent atomic mercury by adsorption.
  • the activated carbon for removing atomic mercury passes through the valve 54 and is introduced into the exhaust gas path 16 at a location upstream of the bag filter 19, particularly immediately before the bag filter 19 or inside the bag filter 19.
  • a first charging device 55 is configured to load the activated carbon for removing atomic mercury into the exhaust gas path 16.
  • the activated carbon for removing atomic mercury can also adsorb and remove divalent mercury. Examples of the activated carbon for removing atomic mercury include iodine-supported activated carbon, sulfur-supported activated carbon, and bromine-supported activated carbon.
  • the mercury analyzer 26 can detect a sudden generation peak of zero-valent atomic mercury. For this reason, the removal process is a game with time.
  • the activated carbon for removing atomic mercury when it is used, it is necessary to add a large amount of time over time, and if it occurs suddenly, a situation may occur in time. Therefore, by introducing the activated carbon for removing atomic mercury into the combustion exhaust gas from the tank 52 of the first charging device 55, the zero-valent atomic mercury can be removed together with the divalent mercury quickly and reliably. it can.
  • zero-valent atomic mercury contained in the combustion exhaust gas is mainly adsorbed and removed by the activated carbon for removing atomic mercury from the tank 52 of the first charging device 55.
  • divalent mercury constituting a mercury compound such as soluble mercury salt contained in the combustion exhaust gas is mainly adsorbed and removed by normal activated carbon from the tank 21 of the second charging device 56.
  • the processing apparatus shown in FIG. 7 since the activated carbon tank 21 that can put normal activated carbon into the combustion exhaust gas is provided together with the activated carbon tank 52 for removing atomic mercury, the processing apparatus shown in FIG. In comparison, the consumption of activated carbon for removing atomic mercury can be reduced. For this reason, the cost can be reduced accordingly.
  • a control system using the activated carbon tank 52 for removing atomic mercury and normal activated carbon can be introduced into the combustion exhaust gas.
  • the difference is that the control system using the activated carbon tank 21 is separated.
  • control system using the activated carbon tank 52 for removing atomic mercury of the first input device 55 includes a mercury detection device 25 including the intake unit 27 and the mercury analyzer 26, and a control device 29. This is the same configuration as the processing apparatus shown in FIG.
  • a mercury detector 25a having an analyzer 51 is provided.
  • the sampling path 28 includes a reduction catalyst for reducing a mercury compound such as a soluble mercury salt contained in the sample gas to atomic mercury, similarly to the known mercury detector shown in FIG. 4B.
  • the intake portion 27 is provided at a position downstream of the bag filter 19 in the exhaust gas path 16.
  • the intake 27 can be provided in the chimney 17 instead of the illustrated position.
  • the detection signal line 30 from the total amount mercury analyzer 51 of the mercury detector 25 a is led to a control device 29 a different from the control device 29.
  • a control signal line 31 from the control device 29 a is connected to the valve 22.
  • the control device 29 and the control device 29 a are illustrated as different ones, but a single control device can also serve as both.
  • the control device 29 provides the activated carbon for removing atomic mercury from the tank 52 on the downstream side of the intake portion 27 based on the detection signal from the mercury analyzer 26 of the mercury detector 25. From the input port 53, the combustion exhaust gas inside the path 16 is input. That is, the control device 29 performs foot forward control.
  • the control device 29a based on the detection signal from the total mercury mercury analyzer 51 of the mercury detector 25a, the activated carbon from the tank 21 from the inlet 20 provided on the upstream side of the intake 27, It is introduced into the combustion exhaust gas inside the path 16. That is, the control device 29a performs feedback control.
  • the mercury analyzer 26 does not detect atomic mercury and the mercury analyzer 51 installed at a position corresponding to the outlet of the bag filter 19 detects mercury, the amount of activated carbon supplied from the tank 21 is increased. .
  • a sharp peak is observed in zero-valent atomic mercury. Without detecting an increase in the amount of normal activated carbon from the activated carbon tank 21 by detecting this occurrence state with the mercury analyzer 26 and introducing activated carbon exclusively for removing atomic mercury from the tank 52. Atomic mercury can be removed reliably and quickly. On the other hand, most of divalent mercury soot composing mercury compounds such as soluble mercury salts is in the form of mercury chloride that is easily removed by ordinary activated carbon. For this reason, even if mercury is detected on the downstream side of the bag filter 19 as shown in the figure and the amount of activated carbon supplied from the tank 21 is controlled, the mercury can be sufficiently removed.
  • the intake 27 of the mercury detector 25a for the second input device 56 is installed on the downstream side of the bag filter 19 in the exhaust gas path 16.
  • the taking-in part 27 can also be installed upstream from the bag filter 19.
  • the combustion exhaust gas treatment device shown in FIG. 9 is provided with a wet gas cleaning device 43 instead of the activated carbon tank, similarly to the treatment device shown in FIG.
  • an atomic mercury removing chelate tank 57 for processing zero-valent atomic mercury is installed instead of the chelate tank 44 in the processing apparatus shown in FIG. Yes.
  • the chelating agent stored in the chelating tank 57 is capable of forming a chelate complex incorporating atomic mercury in the combustion exhaust gas, and is washed through the valve 58 in the form of washing water containing the chelating agent. Supplied to the device 43.
  • the combustion exhaust gas treatment device shown in FIG. 10 includes a wet gas cleaning device 43 and an atomic mercury removal chelate tank 57, as in the treatment device shown in FIG.
  • a chelate tank 44 capable of storing a chelating agent capable of forming a chelate complex incorporating mercury in the combustion exhaust gas is provided.
  • the first washing water to which the chelating agent for removing zero-valent atomic mercury is added is supplied from the tank 57 through the valve 58 to the washing device 43 to react with the combustion exhaust gas.
  • the point which has the 1st charging device 55 and the 2nd charging device 56 is the same as that of the processing apparatus shown in FIG.
  • a valve 58 for supplying the chelating agent for removing atomic mercury in the tank 57 to the cleaning device 43 is controlled by the control device 29, and a valve 45 for supplying the chelating agent in the tank 44 to the cleaning device 43 is the other. It is controlled by the control device 29a. Instead of this, it is also possible to control both valves 45 and 58 by a single control device, similarly to the processing device shown in FIG.
  • the combustion exhaust gas treatment device shown in FIG. 11 includes a control system using a tank 57 storing a chelating agent for removing atomic mercury in the first charging device 55, and a bivalent mercury removal device in the second charging device 56. And the control system using the tank 44 storing the chelating agent.
  • the control system using the atomic mercury removing chelate tank 57 of the first charging device 55 includes a mercury detection device 25 and a control device 29.
  • the control system using the chelate tank 44 of the second charging device 56 includes a mercury detection device 25a provided with a total mercury analysis device 51 and a control device 29a. This point is also in common with the processing apparatus shown in FIG.
  • the intake 27 for the mercury detector 25 a is located upstream of the bag filter 19 in addition to the position downstream of the bag filter 19 in the illustrated exhaust gas path 26. It can also be installed on the side. Furthermore, both functions of the control device 29 and the control device 29a can be realized by a single control device. Others are the same as those of the processing apparatus shown in FIG.
  • an activated carbon adsorption tower can be installed downstream of the bag filter 19 along the combustion exhaust gas flow path 18.
  • a new mercury is provided on the downstream side of the activated carbon adsorption tower along the combustion exhaust gas flow path 18 separately from the mercury detection means provided on the upstream side of the chemical injection means in the combustion exhaust gas flow path.
  • the taking-in part 27 of the detection apparatus 25 can be arrange
  • activated carbon and a chelating agent are used as examples of mercury removal agents.
  • the mercury removing agent is not limited to these, and any one can be used.
  • the present invention is not limited to this, and can also be applied to combustion exhaust gas from other devices such as a coal combustion device.

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  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)

Abstract

La présente invention comprend un dispositif de détection de mercure (25) pour détecter la quantité de mercure contenue dans des gaz de fumée; et un orifice d'introduction (20) par lequel peut être introduit dans le gaz de fumée un agent chimique permettant d'éliminer le mercure, ainsi qu'un réservoir de charbon actif (21) destiné à stocker l'agent. Le dispositif de détection de mercure (25) détecte la quantité de mercure atomique contenu dans le gaz de fumée, mais ne détecte pas la quantité de composés du mercure, tels que des sels de mercure solubles, contenus dans le gaz de fumée. Lorsque le dispositif de détection de mercure (25) a détecté que la quantité de mercure élémentaire a dépassé une quantité prédéfinie, du charbon actif est introduit dans le gaz de fumée provenant du réservoir de charbon actif (21) par l'orifice d'introduction (20) comme agent chimique pour éliminer le mercure.
PCT/JP2016/055190 2015-02-24 2016-02-23 Appareil pour traiter des gaz de fumée Ceased WO2016136714A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2016568700A JP6173621B2 (ja) 2015-02-24 2016-02-23 燃焼排ガスの処理装置
CN201680011880.XA CN107249717A (zh) 2015-02-24 2016-02-23 燃烧排气的处理装置

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Application Number Priority Date Filing Date Title
JP2015-033436 2015-02-24
JP2015033436 2015-02-24

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WO2016136714A1 true WO2016136714A1 (fr) 2016-09-01

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JP2018066523A (ja) * 2016-10-21 2018-04-26 日立造船株式会社 薬剤投入装置および燃焼排ガスの処理設備
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JP2019027672A (ja) * 2017-07-31 2019-02-21 日立造船株式会社 燃焼排ガスの処理装置
JP2019027671A (ja) * 2017-07-31 2019-02-21 日立造船株式会社 燃焼排ガスの処理装置
JP2019063765A (ja) * 2017-10-04 2019-04-25 Ｊｆｅエンジニアリング株式会社 排ガス処理装置及び排ガス処理方法
WO2019198597A1 (fr) * 2018-04-12 2019-10-17 日立造船株式会社 Dispositif de mesure de concentration de mercure, dispositif de traitement de gaz d'échappement et procédé de traitement de gaz d'échappement
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CN111919116B (zh) * 2018-04-12 2022-11-08 日立造船株式会社 汞浓度测定装置、排气处理装置以及排气处理方法
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