WO2009093576A1 - 石炭焚ボイラの排ガス処理システム及びその運転方法 - Google Patents
石炭焚ボイラの排ガス処理システム及びその運転方法 Download PDFInfo
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- WO2009093576A1 WO2009093576A1 PCT/JP2009/050771 JP2009050771W WO2009093576A1 WO 2009093576 A1 WO2009093576 A1 WO 2009093576A1 JP 2009050771 W JP2009050771 W JP 2009050771W WO 2009093576 A1 WO2009093576 A1 WO 2009093576A1
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- F23J15/00—Arrangements of devices for treating smoke or fumes
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
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- 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
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0262—Compounds of O, S, Se, Te
- B01J20/0266—Compounds of S
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
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- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B01J45/00—Ion-exchange in which a complex or a chelate is formed; Use of material as complex or chelate forming ion-exchangers; Treatment of material for improving the complex or chelate forming ion-exchange properties
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
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- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
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- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/602—Mercury or mercury compounds
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
- C02F1/683—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water by addition of complex-forming compounds
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- C02F2209/00—Controlling or monitoring parameters in water treatment
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Definitions
- the present invention relates to an exhaust gas treatment system for a coal fired boiler that removes mercury from the exhaust gas of a boiler, and an operation method thereof.
- a boiler is provided with a wet desulfurization device for removing sulfur content in exhaust gas.
- a desulfurization device for removing sulfur content in exhaust gas.
- chlorine (Cl) content in the exhaust gas increases, the proportion of divalent metal mercury soluble in water increases. It is widely known that mercury is easily collected by the desulfurization apparatus.
- Patent Document 1 a method and apparatus for treating metallic mercury in combination with a denitration apparatus that reduces NOx and a wet desulfurization apparatus that uses an alkaline absorbent as an SOx absorbent.
- the conventional exhaust gas treatment system includes a denitration device 13 that removes nitrogen oxides in the exhaust gas from the coal fired boiler 11 by adding ammonia 12, and heat in the gas after the removal of nitrogen oxides.
- the air preheater 14 to be recovered, the dust collector 15 to remove the dust in the gas after the heat recovery, and the sulfur oxide in the gas after the dust removal are removed by the lime / gypsum method and the mercury oxide is removed.
- a liquid contact type desulfurization device 16 and a chimney 17 for discharging the purified gas after desulfurization and mercury removal to the outside are provided.
- activated carbon 22a is supplied into the gas passage so as to adsorb and remove mercury in the gas.
- reference numeral 18 denotes air. By supplying the air 18, the oxidation-reduction potential in the desulfurization device 16 is adjusted.
- the installation cost of the activated carbon spraying device for removing mercury and the operating cost for 10 years are compared, it may be more expensive than purchasing a separate mercury emission right. This is because activated carbon that has adsorbed mercury is separated by a bag filter, but its disposal cost is high.
- the present invention can efficiently remove mercury in exhaust gas from a coal-fired boiler and can reduce the operating cost, and an operation method for the exhaust gas treatment system of a coal-fired boiler.
- the purpose is to provide.
- a first invention of the present invention for solving the above-mentioned problems is a denitration device that removes nitrogen oxides in exhaust gas from a coal fired boiler, and an air preheat that recovers heat in the gas after removal of nitrogen oxides ,
- a dust collector that removes dust in the gas after heat recovery, and a gas-liquid contact type desulfurization device that removes sulfur oxide in the gas after dust removal by the lime / gypsum method and removes mercury oxide
- an exhaust gas treatment system comprising a chimney that discharges the gas after desulfurization to the outside, spraying hydrogen chloride on the upstream side of the denitration device, and spraying activated carbon on the downstream side of the dust collector, It is in an exhaust gas treatment system for a coal fired boiler characterized by adsorbing mercury in the gas.
- the second invention is a denitration device that removes nitrogen oxides in exhaust gas from a coal fired boiler, an air preheater that recovers heat in the gas after removal of nitrogen oxides, and dust in the gas after heat recovery.
- a dust collector that removes dust, sulfur oxide in the gas after dust removal is removed by the lime / gypsum method, a gas-liquid contact type desulfurization device that removes mercury oxide, and the gas after desulfurization is discharged to the outside
- hydrogen chloride is sprayed on the upstream side of the denitration device, and activated carbon is sprayed on the downstream side of the dust collector to adsorb mercury in the gas, and in the desulfurization device
- the exhaust gas treatment system of a coal fired boiler is characterized in that the oxidation-reduction potential of the absorption liquid is 150 mV or more.
- a third invention is characterized in that in the first or second invention, the slurry absorbing liquid containing mercury is extracted to the outside, a flocculant is added before separating the gypsum, and the mercury is agglomerated and removed. Located in boiler exhaust gas treatment system.
- the separation liquid from which gypsum is separated is brought into contact with at least one of activated carbon, a chelate resin, an ion exchange resin, or a sulfide-supporting carrier to adsorb mercury. It is in the exhaust gas treatment system of a coal fired boiler characterized by removing.
- the 5th invention uses the exhaust gas processing system of any one of the 1st thru
- the method of operating an exhaust gas treatment system of a coal fired boiler is characterized in that mercury concentration is monitored on the downstream side of the desulfurization unit and activated carbon is sprayed according to the result.
- the operating cost can be reduced, and mercury can be stably adsorbed and immobilized over a long period of time.
- FIG. 1 is a schematic diagram of an exhaust gas treatment system for a coal fired boiler according to a first embodiment.
- FIG. 2 is a graph showing the relationship between ⁇ Hg / ⁇ CaSO 4 and mercury removal performance (gas mercury concentration at the gas-liquid contact tower outlet) in the gas-liquid contact tower.
- FIG. 3 is a summary chart of Hg / S ratios for 30 specimens of bituminous coal of US coal.
- FIG. 4 is a summary chart of Hg / S ratios for 30 samples of PRB coal of US coal.
- FIG. 5 is a schematic diagram of an exhaust gas treatment system for a coal fired boiler according to a second embodiment.
- FIG. 6 is a schematic diagram of an exhaust gas treatment system for a coal fired boiler according to a third embodiment.
- FIG. 7 is a schematic diagram of an exhaust gas treatment system of a conventional coal fired boiler.
- FIG. 1 is a schematic view of an exhaust gas treatment system for a coal fired boiler according to the present invention.
- the HCl spray device 32 sprays the hydrogen chloride 33 on the exhaust gas from the coal fired boiler 11 using coal as the fuel F, and the ammonia 12 is added to the exhaust gas after the hydrogen chloride spray to remove nitrogen oxides by ammonia denitration.
- the exhaust gas treatment system for a coal fired boiler of the present embodiment has an HCl spray device 32 for spraying hydrogen chloride 33 on the upstream side of the denitration device 13, and sprays the hydrogen chloride 33 into the flue to remove the denitration.
- Mercury oxidation (Hg 0 ⁇ Hg 2+ ) on the denitration catalyst in the apparatus 13 is promoted.
- mercury oxide (Hg 2 ) is more easily adsorbed on activated carbon than zero-valent mercury (Hg 0 ), increasing the amount of mercury adsorbed (kgHg / kg activated carbon) and decreasing the amount of activated carbon used (kg activated carbon). Because it can.
- the activated carbon that has adsorbed mercury is collected by the bag filter 21 and disposed of separately.
- the oxidation-reduction potential (ORP) of the absorbing solution in the desulfurization apparatus 16 is measured by the ORP meter 19, and the measured value of the oxidation-reduction potential is set to 150 mV or more.
- mercury oxide (Hg 2+ ) is absorbed in the gas absorption liquid (limestone, gypsum slurry) by gas-liquid contact in the desulfurization apparatus 16, and at that time, the ORP value is 150 mV or more, preferably 200 This is because the reduction (Hg 2+ ⁇ Hg 0 ) of absorbed mercury oxide (Hg 2+ ) can be suppressed by adjusting to ⁇ 300 mV. Thereby, it is possible to prevent mercury from being released again from the gas absorption liquid into the gas.
- the bag filter 21 is installed. However, the bag filter 21 is not installed and is introduced into the desulfurization device 16 as it is, and when gypsum is removed from the absorbent by the lime / gypsum method, You may make it discharge
- the mercury concentration is monitored on the downstream side of the desulfurization unit.
- the operation method of the exhaust gas treatment system of the coal fired boiler that forcibly sprays the activated carbon 22 according to the above may be used.
- Hg / S molar ratio 1.3 ⁇ 10 ⁇ 6 or less.
- the mercury in the exhaust gas can be removed only by supplying the hydrogen chloride 33 and controlling the ORP meter.
- the type of coal coal changes and the Hg / S molar ratio becomes 1.3 ⁇ 10 ⁇ 6 or more.
- the control by the ORP meter 19 cannot cope with the rapid removal of mercury.
- the mercury concentration in the exhaust gas rises, so that the activated carbon is forcibly sprayed to temporarily prevent mercury from being scattered outside. Can do.
- ⁇ Hg / ⁇ CaSO 4 2 mgHg / kgCaSO 4 is converted as follows.
- the molecular weight of mercury (Hg) is 200.59
- the molecular weight of sulfur (S) is 32.066
- the molecular weight of gypsum (CaSO 4 ) is 136.144.
- ⁇ Hg / ⁇ CaSO 4 2 mgHg / kgCaSO 4 corresponds to 1.36 ⁇ 10 ⁇ 6 molHg / molS.
- the threshold value of the Hg / S molar ratio is defined as 1.3 ⁇ 10 ⁇ 6, and if this is exceeded, the mercury removal performance will deteriorate, and it is necessary to take measures to remove mercury. Become.
- FIG.3 and FIG.4 shows the relationship diagram of the content ratio (Hg / S) of coal in bituminous coal and PRB coal, and frequency.
- FIGS. 3 and 4 summarize the Hg / S ratios of 30 samples of bituminous coal and PRB coal of US coal, and the ratio of 1.36 ⁇ 10 ⁇ 6 molHg / molS or less is about 70% for bituminous coal. It was about 27% for PRB charcoal. Even when bituminous coal is used alone or in combination, mercury can be efficiently removed by supplying hydrogen chloride and controlling ORP. Even when the type of coal changes, it is possible to cope with a sudden increase in mercury concentration by spraying activated carbon.
- FIG. 5 is a schematic view of another exhaust gas treatment system for a coal fired boiler according to the present invention.
- the exhaust gas treatment system of the present embodiment includes a denitration device 13 that removes nitrogen oxides in the exhaust gas from the coal fired boiler 11 by adding ammonia 12, and an air preheater that recovers heat in the gas after the removal of nitrogen oxides. 14, a dust collector 15 for removing dust in the gas after heat recovery, and a gas-liquid contact type desulfurization method for removing sulfur oxide in the gas after dust removal by the lime / gypsum method and removing mercury oxide.
- an exhaust gas treatment system comprising an apparatus 16 and a chimney 17 that discharges purified gas after desulfurization / mercury removal, before the slurry absorbing liquid containing mercury from the desulfurization apparatus 16 is extracted to the outside and the gypsum is separated.
- An aggregating agent is added to the material to agglomerate and remove mercury.
- a flocculant is added to the slurry-absorbing liquid containing mercury extracted from the desulfurization device 16, the mercury is aggregated in the flocculant, and the gypsum 24 is separated and removed by the solid-liquid separation device 41. At the same time, the flocculant is separated together with the gypsum 24 so that the mercury concentration in the separated water is lowered.
- the flocculant may be added inside the desulfurizer 16 (40A) or on the upstream side (40B) of the solid-liquid separator 41.
- the concentration of zero-valent mercury (Hg 0 ) in the separated water returned to the desulfurization device 16 can be reduced, and re-scattering of mercury in the desulfurization device 16 can be prevented.
- FIG. 6 is a schematic view of another exhaust gas treatment system for a coal fired boiler according to the present invention.
- the exhaust gas treatment system of the present embodiment includes a denitration device 13 that removes nitrogen oxides in the exhaust gas from the coal fired boiler 11 by adding ammonia 12, and an air preheater that recovers heat in the gas after the removal of nitrogen oxides. 14, a dust collector 15 for removing dust in the gas after heat recovery, and a gas-liquid contact type desulfurization method for removing sulfur oxide in the gas after dust removal by the lime / gypsum method and removing mercury oxide.
- a slurry absorbing liquid containing mercury from the desulfurization apparatus 16 is extracted to the outside, and a solid-liquid separation apparatus 41 Then, the gypsum 24 is separated, and the supernatant water 23 from which the gypsum 24 has been separated is brought into contact with a mercury adsorbing material such as activated carbon, a chelate resin, an ion exchange resin, or a sulfide-supporting carrier in a mercury adsorption / removal device 42. Silver are to be adsorbed and removed.
- the concentration of zero-valent mercury (Hg 0 ) in the separated water returned to the desulfurization device 16 can be reduced, and re-scattering of mercury in the desulfurization device 16 can be prevented.
- mercury re-scattering is reduced, so that mercury removal efficiency can be improved, and mercury emission in exhaust gas is regulated. It is suitable for use in exhaust gas treatment.
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Abstract
Description
図7に示すように、従来の排ガス処理システムは、石炭焚ボイラ11からの排ガス中の窒素酸化物をアンモニア12の添加により除去する脱硝装置13と、窒素酸化物除去後のガス中の熱を回収する空気予熱器14と、熱回収後のガス中の煤塵を除去する集塵器15と、除塵後のガス中の硫黄酸化物を石灰・石膏法により除去すると共に、酸化水銀を除去する気液接触式の脱硫装置16と、脱硫・水銀除去後の浄化ガスを外部に排出する煙突17とを具備すると共に、集塵器15の後流側にバグフィルタ21を設置し、活性炭噴霧装置22から活性炭22aをガス通路内に供給するようにして、ガス中の水銀を吸着除去するようにしている。なお、図中、符号18は空気である。該空気18を供給することで脱硫装置16内の酸化還元電位を調整するようにしている。
これは、水銀を吸着した活性炭はバグフィルタで分離されるが、その廃棄費用が高額となるからである。
12 アンモニア
13 脱硝装置
14 空気予熱器
15 集塵器
16 脱硫装置
17 煙突
21 バグフィルタ
22a 活性炭
22 活性炭噴霧装置
23 上澄水
24 石膏
41 固液分離装置
図1は本発明の石炭焚ボイラの排ガス処理システムの概略図である。
燃料Fとして石炭を用いる石炭焚ボイラ11からの排ガスに塩化水素33を噴霧するHCl噴霧装置32と、塩化水素噴霧後の排ガス中にアンモニア12を添加してアンモニア脱硝により窒素酸化物を除去すると共に、水銀を酸化する脱硝装置13と、窒素酸化物除去後のガス中の熱を回収する空気予熱器14と、熱回収後のガス中の煤塵を除去する集塵器15と、除塵後のガス中に活性炭22aを噴霧する活性炭噴霧装置22と、水銀を吸着した活性炭を捕集するバグフィルタ21と、活性炭除去後の排ガス中の硫黄酸化物を気液接触による石灰-石膏法により除去すると共に、酸化水銀を除去する脱硫装置16と、脱硫後のガスを外部に排出する煙突17と、脱硫装置16内のスラリ吸収液に空気を供給するために酸化還元電位を計測するORP計19とを具備するものである。
水銀を吸着した活性炭はバグフィルタ21により回収され、別途廃棄処理される。
これによって、ガス吸収液から水銀がガスに再度放出されることを防止することができる。
このような場合において、ORP計19による制御が安定する間は、排ガス中の水銀濃度が上昇するので、活性炭を強制的に噴霧することで、一時的に外部への水銀の飛散を防止することができる。
先ず、ΔHg/ΔCaSO4=Δ水銀除去量/Δ石膏生成量の関係から、脱硫装置16である気液接触塔におけるΔHg/ΔCaSO4と水銀除去性能(気液接触塔出口でのガス中水銀濃度)の関係を図2に示す。
このグラフよりΔHg/ΔCaSO4が2mgHg/kgCaSO4以下で、水銀除去性能を維持できることが判明する。
水銀(Hg)と石膏(CaSO4)に含まれる硫黄(S)は、最上流の石炭に起因する。
Hgmol/Smol=2mgHg/kgCaSO4 × 〔(1/200.59)×10-3 molHg/mgHg〕/(1/136.144)×103molS/kgCaSO4〕
=1.357×10-6 molHg/molS
なお、水銀(Hg)の分子量を200.59、硫黄(S)の分子量を32.066、石膏(CaSO4)の分子量を136.144とする。
よって、ΔHg/ΔCaSO4 2mgHg/kgCaSO4は、1.36×10-6molHg/molSに相当することとなる。
この結果、Hg/Sモル比の閾値として1.3×10-6と規定し、これを上回る場合には、水銀除去性能が低下することになるので、水銀除去対策を講じる必要があることとなる。
図3及び図4は、米国石炭の瀝青炭及びPRB炭の各30検体のHg/S比を集計したものであり、1.36×10-6 molHg/molS以下の比率は、瀝青炭では約70%であり、PRB炭では約27%であった。
このような、瀝青炭を単独で又は混合して用いるような場合においても、塩化水素の供給とORPの制御で水銀の除去を効率よく行うことができる。また、石炭の種類が変化する場合においても、活性炭を噴霧することで急激な水銀濃度の上昇があっても対応が可能となる。
本実施例の排ガス処理システムは、石炭焚ボイラ11からの排ガス中の窒素酸化物をアンモニア12の添加により除去する脱硝装置13と、窒素酸化物除去後のガス中の熱を回収する空気予熱器14と、熱回収後のガス中の煤塵を除去する集塵器15と、除塵後のガス中の硫黄酸化物を石灰・石膏法により除去すると共に、酸化水銀を除去する気液接触式の脱硫装置16と、脱硫・水銀除去後の浄化ガスを外部に排出する煙突17とを具備する排ガス処理システムにおいて、脱硫装置16からの水銀を含有するスラリ吸収液を外部に抜き出し、石膏を分離する前に凝集剤を添加し、水銀を凝集除去するものである。
凝集剤の添加は脱硫装置16の内部(40A)又は固液分離装置41の前流側(40B)において行えばよい。
本実施例の排ガス処理システムは、石炭焚ボイラ11からの排ガス中の窒素酸化物をアンモニア12の添加により除去する脱硝装置13と、窒素酸化物除去後のガス中の熱を回収する空気予熱器14と、熱回収後のガス中の煤塵を除去する集塵器15と、除塵後のガス中の硫黄酸化物を石灰・石膏法により除去すると共に、酸化水銀を除去する気液接触式の脱硫装置16と、脱硫・水銀除去後の浄化ガスを外部に排出する煙突17とを具備する排ガス処理システムにおいて、脱硫装置16からの水銀を含有するスラリ吸収液を外部に抜き出し、固液分離装置41で石膏24を分離し、石膏24を分離した上澄水23に対し、水銀吸着除去装置42内で活性炭、キレート樹脂、イオン交換樹脂、又は硫化物担持担体等の水銀吸着材と接触させ、水銀を吸着除去するようにしている。
Claims (5)
- 石炭焚ボイラからの排ガス中の窒素酸化物を除去する脱硝装置と、
窒素酸化物除去後のガス中の熱を回収する空気予熱器と、
熱回収後のガス中の煤塵を除去する集塵器と、
除塵後のガス中の硫黄酸化物を石灰・石膏法により除去すると共に、酸化水銀を除去する気液接触式の脱硫装置と、
脱硫後のガスを外部に排出する煙突とを具備する排ガス処理システムにおいて、
脱硝装置の前流側で塩化水素を噴霧すると共に、
前記集塵器の後流側で活性炭を噴霧して、ガス中の水銀を吸着することを特徴とする石炭焚ボイラの排ガス処理システム。 - 石炭焚ボイラからの排ガス中の窒素酸化物を除去する脱硝装置と、
窒素酸化物除去後のガス中の熱を回収する空気予熱器と、
熱回収後のガス中の煤塵を除去する集塵器と、
除塵後のガス中の硫黄酸化物を石灰・石膏法により除去すると共に、酸化水銀を除去する気液接触式の脱硫装置と、
脱硫後のガスを外部に排出する煙突とを具備する排ガス処理システムにおいて、
脱硝装置の前流側で塩化水素を噴霧すると共に、
前記集塵器の後流側で活性炭を噴霧して、ガス中の水銀を吸着させ、
脱硫装置内の吸収液の酸化還元電位を150mV以上とすることを特徴とする石炭焚ボイラの排ガス処理システム。 - 請求項1又は2において、
水銀を含有するスラリ吸収液を外部に抜き出し、石膏を分離する前に凝集剤を添加し、水銀を凝集除去することを特徴とする石炭焚ボイラの排ガス処理システム。 - 請求項1乃至3のいずれか一つにおいて、
石膏を分離した分離液と、活性炭、キレート樹脂、イオン交換樹脂、又は硫化物担持担体の少なくとも一つと接触させ、水銀を吸着除去することを特徴とする石炭焚ボイラの排ガス処理システム。 - 請求項1乃至4のいずれか一つの石炭焚ボイラの排ガス処理システムを用いて、
石炭の水銀(Hg)/硫黄(S)のモル比が1.3×10-6以上である場合に、脱硫装置の後流側で水銀濃度を監視し、その結果に応じて活性炭を噴霧することを特徴とする石炭焚ボイラの排ガス処理システムの運転方法。
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CN101918108A (zh) | 2010-12-15 |
JP2009166012A (ja) | 2009-07-30 |
CA2711950A1 (en) | 2009-07-30 |
CA2711950C (en) | 2013-01-08 |
US20110044872A1 (en) | 2011-02-24 |
US8071060B2 (en) | 2011-12-06 |
CN101918108B (zh) | 2013-06-05 |
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