CN105854565A - Combined removal method for SO3 and Hg in flue gas of coal-fired power plant - Google Patents

Combined removal method for SO3 and Hg in flue gas of coal-fired power plant Download PDF

Info

Publication number
CN105854565A
CN105854565A CN201610378586.4A CN201610378586A CN105854565A CN 105854565 A CN105854565 A CN 105854565A CN 201610378586 A CN201610378586 A CN 201610378586A CN 105854565 A CN105854565 A CN 105854565A
Authority
CN
China
Prior art keywords
flue gas
coal
absorbent
removal methods
fired plant
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.)
Pending
Application number
CN201610378586.4A
Other languages
Chinese (zh)
Inventor
陈建宏
李紫龙
范振兴
王济平
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.)
CPI Yuanda Environmental Protection Engineering Co Ltd
Original Assignee
CPI Yuanda Environmental Protection 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 CPI Yuanda Environmental Protection Engineering Co Ltd filed Critical CPI Yuanda Environmental Protection Engineering Co Ltd
Priority to CN201610378586.4A priority Critical patent/CN105854565A/en
Publication of CN105854565A publication Critical patent/CN105854565A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—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
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/02—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 by adsorption, e.g. preparative gas chromatography
    • B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
    • B01D53/10—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents
    • 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
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/60—Heavy metals or heavy metal compounds
    • B01D2257/602—Mercury or mercury compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/812—Electrons

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention disclose a combined removal method for SO3 and Hg in flue gas of a coal-fired power plant. The method comprises the following steps of: a, mixing and heating an alkalinity absorbent and deionized water, mixing with air, atomizing to obtain an absorbent spray, and spraying into flue gas containing SO3 and Hg; and b, performing electrostatic precipitation treatment on the flue gas treated in the step a, and contacting an absorbent solution and sulfur trioxide to generate a chemical reaction, thereby removing SO3 in the flue gas. By virtue of atomizing and spraying the absorbent solution, SO3 in the flue gas is removed, so that the usage amount of the absorbent solution can be effectively reduced, the operating cost is lowered, and the concentration of SO3 in the flue gas is reduced to the greatest extent; according to test of the applicant, the removal efficiency of SO3 can be reduced by 90-99%.

Description

SO in coal-fired plant flue gas3Associating removal methods with Hg
Technical field
The present invention relates to atmosphere pollution and administer field, particularly to SO3 and Hg in a kind of coal-fired plant flue gas Associating removal methods.
Background technology
China's current thermoelectricity installed capacity reaches 900,000,000 kilowatts, accounts for whole nation generating capacity more than 60%, in phase from now on When, in long one period, thermoelectricity remains the generating main force of China.More strict along with national environmental standard, The Conventional pollution NOx of thermal power plant discharge, SO2, dust have been obtained for effectively controlling, but cigarette SO3 and heavy metal Hg in gas are the most effectively removed.
SO3 is a kind of polluter being present on a small quantity in coal-fired plant flue gas, but its existence endangers very Greatly, all be there is many negative effects in the properly functioning of power plant and atmospheric environment.Its main harm has: formed " Lan Yu ", increases smoke evacuation opacity；Improve acid dew point and corrosion；React with steam, NH3, Generate ammonium hydrogen sulfate and ammonium sulfate.Ammonium hydrogen sulfate and ammonium sulfate can be deposited in catalyst surface, blocking microporous, Cause catalyst failure etc., additionally, health is also adversely affected.Additionally, SO3 Yu Hg is at flue gas Flying dust also exists competitive Adsorption, the SO3 in uncompleted burned carbon meeting Preferential adsorption flue gas in flying dust, reduces by zero The ratio that valency hydrargyrum converts to particle mercury, and then affect the dust pelletizing system overall removal effect to hydrargyrum.The most de- Except the method for SO3 mainly has: use low-sulfur coal, mixed coal；Develop low SO3 oxygenation efficiency SCR catalyst； Wet desulphurization；Wet cottrell；Sorbent injection absorbs SO3 technology etc..Chinese patent 201310044506.8 disclose a kind of device utilizing trona effectively to remove flue gas SO3 and technique, but should Needed for device, absorbent consumption is high, and the removal efficiency of SO3 only has 87%, relatively costly, and extrusion rate is relatively low, Removal effect is poor.
Hydrargyrum 3 kinds of grown forms of existence in coal-fired plant flue gas: element state Hg0, oxidation state Hg2+And granule State hydrargyrum Hgp。HgpAnd Hg2+Can be removed largely in ESP and WFGD respectively, but Due to Hg0Highly volatile and be insoluble in water, the existing flue gas purifying equipment in coal-burning power plant is difficult to remove it.Cause This, the key of coal-fired plant flue gas demercuration is exactly Hg0Removing, or perhaps improve Hg0To other form hydrargyrum The ability converted.Chinese patent CN101480555A discloses a kind of has the residual of good adsorption effect to hydrargyrum Carbon and bag filter synergism remove the hydrargyrum in flue gas；Chinese patent CN102580493 discloses one Plant halogen family material based on discharge activation, elemental mercury in flue gas is changed into oxidation state hydrargyrum and particle mercury After, carry out dedusting and absorbing and removing oxidation state hydrargyrum and particle mercury.Major part demercuration technical matters is multiple at present Miscellaneous, relatively costly.
In view of the above circumstances, coal-burning power plant's removing to SO3 and Hg at present be all be respectively adopted the most de- Except system, seldom having what a kind of system or technique can complete SO3 and Hg to combine removing, this also can give combustion Coal-fired plant brings extra installation and operation cost.
Summary of the invention
In view of this, it is an object of the invention to provide combining of SO3 and Hg in a kind of coal-fired plant flue gas de- Except method, it is possible to effectively reduce absorbent consumption, reduce operating cost, at utmost reduce coal-burning power plant's cigarette The concentration of SO3 and Hg in gas.
SO in the coal-fired plant flue gas of the present invention3With the associating removal methods of Hg, comprise the following steps:
A. will become to spray after absorbent water smoke with air mixing atomizing after alkaline absorbent and deionized water Hybrid Heating Penetrate in containing middle SO3Flue gas with Hg；
B. the flue gas after processing in step a processes removing Hg through electrostatic precipitation；
Further, in step a, described absorbent is Na2CO3、NaHSO3In one or both mixture；
Further, in step a, it is mixed and heated to 30-50 DEG C；
Further, in step a, it is mixed and heated to 40 DEG C；
Further, in step a, flue entrance or/and outlet injection absorbent water smoke；
Further, also include the absorbent water smoke before injection is carried out anti-cured；
Further, lance ejection absorbent water smoke, the connection of described spray gun is used to prevent absorbent solution not The cooling air conservation device of solidification before injection.
Beneficial effects of the present invention: the associating removal methods of SO3 and Hg in the coal-fired plant flue gas of the present invention, Contact generation chemical reaction with sulfur trioxide by absorbent solution, thus realize sulfur trioxide in flue gas Removing.The present invention uses atomized spray absorbent solution to remove sulfur trioxide in flue gas, it is possible to effectively Reduce absorbent consumption, reduce operating cost, at utmost to reduce the concentration of sulfur trioxide, warp in flue gas Applicant tests the removal efficiency of sulfur trioxide up to 90%～99%；The concentration of SO3 in reducing flue Meanwhile, improve the uncompleted burned carbon absorbability to gaseous mercury in flying dust, improve enter electrostatic precipitation The ratio of grain state hydrargyrum, and then improve the electrostatic precipitation overall arresting efficiency to Hg, reach SO3, Hg Associating removal effect, when electrostatic precipitator outlet SO3 concentration be down to 1ppm by 5ppm, fine coal in ash bucket In ash, the content of hydrargyrum is risen to 8.3ug/g～10.6ug/g by 1.2ug/g～1.9ug/g, and the arresting efficiency of hydrargyrum is obvious Rise, enter back into existing fume treatment auxiliary by the flue gas of above-mentioned PROCESS FOR TREATMENT and be further processed, Facilitate the carrying out of subsequent treatment process.
Detailed description of the invention
SO in the coal-fired plant flue gas of the present embodiment3With the associating removal methods of Hg, comprise the following steps:
A. will become to spray after absorbent water smoke with air mixing atomizing after alkaline absorbent and deionized water Hybrid Heating Penetrate in containing middle SO3Flue gas with Hg；
B. the flue gas after processing in step a processes removing Hg through electrostatic precipitation；Alkaline absorbent fills with SO3 Tap triggers biochemical reaction and generates sodium sulfate, completes the removal to SO3, and then reduces SO3 and gaseous mercury Competitive Adsorption on flue gas flying dust, in SCR is exported to electrostatic precipitator gas approach, makes more gas State hydrargyrum adsorbs on flying dust, improves the ratio entering electrostatic precipitator endoparticle state hydrargyrum, and then raising electrostatic removes The dirt device arresting efficiency to Hg；Alkaline absorbent preparation and spraying system include absorbent preparation and storage bin, Demineralized water storage bin connects with absorbent storage bin and demineralized water storage bin for preparing the molten of absorbent solution Solve case and connect the injection apparatus being used for flue atomization injection absorbent solution, described absorption with dissolving case Agent storage bin is connected with dissolving case entrance point by transfer pipeline I respectively with demineralized water storage bin, described dissolving case The port of export is connected with injection apparatus by transfer pipeline II, and described injection apparatus is connected by transfer pipeline III to be had Compressed air supply system；The eject position of described injection apparatus is SCR denitration system gas approach or SCR Denitrating system exhaust pass.Described injection apparatus is the blender for absorbent solution carries out atomized spray, Described blender entrance point is provided with atomizer, and described atomizer entrance point is respectively by transfer pipeline II Connecting with dissolving case and compressed air supply system with transfer pipeline III, mixer outlet end passes through transfer pipeline IV connects injection grid.Described injection apparatus is spray gun, and described spray gun entrance point passes through transfer pipeline respectively II and transfer pipeline III connects with dissolving case and compressed air supply system, and lance outlet end is provided with pressure mist Change nozzle.
In the present embodiment, in step a, described absorbent is Na2CO3、NaHSO3In one or both mixed Compound；It is fully contacted generation chemical reaction with SO3 and generates sodium sulfate, complete the removal to SO3, and then fall Low SO3 and gaseous mercury competitive Adsorption on flue gas flying dust.
In the present embodiment, in step a, it is mixed and heated to 30-50 DEG C；Absorbent solution temperature is made to remain At 30 DEG C～50 DEG C, to ensure the amount of solute in absorbent solution, prevent from causing crystallization etc. because temperature reduces Problem.
In the present embodiment, in step a, it is mixed and heated to 40 DEG C；In absorbent solution, the amount of solute reaches Good.
In the present embodiment, in step a, flue entrance or/and outlet injection absorbent water smoke；I.e. described The eject position of injection apparatus is SCR denitration system gas approach or SCR denitration system exhaust pass or air Preheater exhaust pass or wet desulphurization absorption tower gas approach, the suitability is strong.
In the present embodiment, also include the absorbent water smoke before injection is carried out anti-cured；Guarantee atomization spray Penetrate effect.
In the present embodiment, lance ejection absorbent water smoke, the connection of described spray gun is used to prevent absorbent solution The cooling air conservation device of solidification before not spraying.
Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although With reference to preferred embodiment, the present invention is described in detail, it will be understood by those within the art that, Technical scheme can be modified or equivalent, without deviating from technical solution of the present invention Objective and scope, it all should be contained in the middle of scope of the presently claimed invention.

Claims (7)

1. SO in a coal-fired plant flue gas3Associating removal methods with Hg, it is characterised in that: include following Step:
A. will become to spray after absorbent water smoke with air mixing atomizing after alkaline absorbent and deionized water Hybrid Heating Penetrate in containing middle SO3Flue gas with Hg；
B. the flue gas after processing in step a processes removing Hg through electrostatic precipitation.
SO in coal-fired plant flue gas the most according to claim 13With the associating removal methods of Hg, it is special Levying and be: in step a, described absorbent is Na2CO3、NaHSO3In one or both mixture.
SO in coal-fired plant flue gas the most according to claim 23With the associating removal methods of Hg, it is special Levy and be: in step a, be mixed and heated to 30-50 DEG C.
SO in coal-fired plant flue gas the most according to claim 33With the associating removal methods of Hg, it is special Levy and be: in step a, be mixed and heated to 40 DEG C.
SO in coal-fired plant flue gas the most according to claim 43With the associating removal methods of Hg, it is special Levy and be: in step a, flue entrance or/and outlet injection absorbent water smoke.
SO in coal-fired plant flue gas the most according to claim 53With the associating removal methods of Hg, it is special Levy and be: also include the absorbent water smoke before injection is carried out anti-cured.
SO in coal-fired plant flue gas the most according to claim 63With the associating removal methods of Hg, it is special Levy and be: use lance ejection absorbent water smoke, the connection of described spray gun to prevent absorbent solution from not spraying The cooling air conservation device of front solidification.
CN201610378586.4A 2016-06-01 2016-06-01 Combined removal method for SO3 and Hg in flue gas of coal-fired power plant Pending CN105854565A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610378586.4A CN105854565A (en) 2016-06-01 2016-06-01 Combined removal method for SO3 and Hg in flue gas of coal-fired power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610378586.4A CN105854565A (en) 2016-06-01 2016-06-01 Combined removal method for SO3 and Hg in flue gas of coal-fired power plant

Publications (1)

Publication Number Publication Date
CN105854565A true CN105854565A (en) 2016-08-17

Family

ID=56643145

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610378586.4A Pending CN105854565A (en) 2016-06-01 2016-06-01 Combined removal method for SO3 and Hg in flue gas of coal-fired power plant

Country Status (1)

Country Link
CN (1) CN105854565A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102716639A (en) * 2012-07-20 2012-10-10 中电投远达环保工程有限公司 High-efficiency wet-type electric dust removal and desulfuration system and process
CN102974185A (en) * 2012-11-29 2013-03-20 上海龙净环保科技工程有限公司 Modularized integrated smoke purification system and method for removing plurality of pollutants
CN105233656A (en) * 2015-11-02 2016-01-13 中电投远达环保工程有限公司 Process used for removing sulfur trioxide in flue gas of coal-fired power plant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102716639A (en) * 2012-07-20 2012-10-10 中电投远达环保工程有限公司 High-efficiency wet-type electric dust removal and desulfuration system and process
CN102974185A (en) * 2012-11-29 2013-03-20 上海龙净环保科技工程有限公司 Modularized integrated smoke purification system and method for removing plurality of pollutants
CN105233656A (en) * 2015-11-02 2016-01-13 中电投远达环保工程有限公司 Process used for removing sulfur trioxide in flue gas of coal-fired power plant

Similar Documents

Publication Publication Date Title
CN103816780B (en) A kind of low-temperature flue gas desulphurization denitration is except ammonia integral process
CN105477995B (en) A kind of method of sulfur trioxide in removing coal-fired flue-gas
WO2014129030A1 (en) Exhaust gas treatment system and exhaust gas treatment method
CN104258673B (en) The denitration of middle low-temperature flue gas desulfurization and dedusting and denitrating catalyst Thermal desorption integrated apparatus
CN205199271U (en) Middle -size and small -size coal fired boiler flue gas dedusting and desulfurizing denitration is treatment equipment in coordination
CN105668832B (en) A kind of desulfurization wastewater treatment system and method
CN103933838A (en) Pollutant combined removal device and method through recycling of chlorine in coal
CN102908889A (en) Sintering flue gas desulfurization and denitrification system and desulfurization and denitrification method thereof
CN106512704B (en) A kind of deduster flying dust modified high-efficient demercuration method and system
CN106237976B (en) A kind of adsorbent and its preparation method and application
CN102989282A (en) Method and device for collaborative removal of mercury in flue gas
CN108043210A (en) A kind of desulfurization of coke oven flue gas and dedusting denitrification integral system
CN204093254U (en) The denitration of middle low-temperature flue gas desulfurization and dedusting and denitrating catalyst Thermal desorption integrated apparatus
CN107469580A (en) A kind of wet flue gas desulfurizing and hydrargyrum-removing dust removal integrated plant and technique
CN203030173U (en) Device for realizing combined contaminant removal through recycling chlorine elements in coal
CN100363088C (en) Method for removing hydrargyrum from coal burning boiler flue gas by ozone oxidation
CN103463960A (en) Desulfurization and purification method of flue gas desulfurization and purification system
CN209714765U (en) A kind of industrial smoke high temperature desulfurizing denitration dust removal system
CN206897142U (en) A kind of integrative coordinated removing sulfur trioxide device suitable for sulphur coal
CN106178877A (en) A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique
CN210278551U (en) Hg and SO3Bag type dust collector with synergistic removal
CN208194090U (en) The device of sulfur trioxide in flue gas is removed using desulfurization wastewater as carrier
CN204042942U (en) A kind of device utilizing coupling technique to realize boiler smoke qualified discharge
CN102886203A (en) Flue gas desulfurization and demercuration method
CN102631830A (en) Method and device for reducing wastewater amount of smelting smoke acid-making process

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20160817

RJ01 Rejection of invention patent application after publication