CN103939930A - System and method for achieving elemental mercury conversion based on flue gas conditioning - Google Patents
System and method for achieving elemental mercury conversion based on flue gas conditioning Download PDFInfo
- Publication number
- CN103939930A CN103939930A CN201410151046.3A CN201410151046A CN103939930A CN 103939930 A CN103939930 A CN 103939930A CN 201410151046 A CN201410151046 A CN 201410151046A CN 103939930 A CN103939930 A CN 103939930A
- Authority
- CN
- China
- Prior art keywords
- flue
- magnesium chloride
- flue gas
- elemental mercury
- chloride solution
- 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
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention discloses a system and method for achieving elemental mercury conversion based on flue gas conditioning. The system for achieving elemental mercury conversion based on flue gas conditioning comprises a boiler, an SCR denitration device, a dedusting device, a wet desulphurization device, a chimney, a magnesium chloride solution tank, a water pump, an air compressor and an atomizing nozzle, wherein the boiler is connected with a vertical flue, the vertical flue is connected with the SCR denitration device through a horizontal flue, the SCR denitration device, the dedusting device, the wet desulphurization device and the chimney are connected in sequence through the flues, the atomizing nozzle is arranged in the flue in front of the SCR denitration device and connected with the water pump through the air compressor, and the water pump is connected with the magnesium chloride solution tank. According to the system and method for achieving elemental mercury conversion based on flue gas conditioning, the system is simple, cost is low, operation is easy, economical and efficient demercuration can be achieved by regulating the mist flow, the control function of existing pollutant control devices on mercury in coal-fired flue gas is fully utilized, the dependence of the SCR catalyzer for elemental mercury oxidation on the chlorine content in coal is eliminated, and the problem that elemental mercury in coal-fired flue gas low in chlorine content is difficult to remove is solved.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to a kind of system and method for realizing Elemental Mercury conversion based on flue gas conditioning.
Background technology
Mercury has hypertoxicity, high volatile volatile and bioconcentration, can cause great harm to human body, is the outer unique a kind of chemical substance exerting an influence in the world of temperature removing chamber's gas, has caused the extensive concern of Chinese scholars.And coal fire discharged mercury is considered to the main source of mercury pollution in atmosphere, therefore, coal-burning power plant's mercury control becomes the study hotspot of current environmental protection.
Mercury in coal-fired flue-gas mainly contains three kinds of forms, gaseous state nonvalent mercury Hg
0, gaseous state divalence mercury Hg
2+with particle mercury Hg
p, wherein divalence mercury Hg
2+very easily water-soluble and easily adsorbed by particles such as flying dusts, can be removed by wet desulphurization equipment and cleaner particle mercury Hg
palso be easy to be removed by deduster gaseous state nonvalent mercury Hg
0due to highly volatile, the features such as stable chemical nature and poorly water-soluble are difficult to caught by existing pollutant control appliance and enter atmosphere, and environment is worked the mischief.The coal that China uses is mainly brown coal, and Elemental Mercury is the Main Morphology of Mercury Emissions from Coal-Fired Boilers, and therefore, how economical and efficient ground is by Hg
0be converted into Hg
2+and Hg
pbecome the focal issue of mercury pollution control.
The control method of mercury pollution mainly contains adsorbent absorption method and catalytic oxidation at present, and the adsorbent method taking active carbon injection as representative has limited its use in practice because cost is higher.Research both at home and abroad finds that SCR catalyst has certain oxidation to mercury, and along with more and more stricter environmental requirement, SCR denitration device will be installed by increasing coal-burning power plant, and most of power plant is all equipped with Hg
2+there is the wet desulphurization equipment that obviously removes effect, utilize the catalysed oxidn of SCR catalyst to mercury, combine and remove mercury and need not increase new equipment in conjunction with wet desulphurization equipment, cost is lower, by the main trend that is coal-burning power plant's mercury pollution control, the key of this technology is to improve the oxidation of SCR catalyst to mercury.And SCR catalyst is limited by chloride ion content in coal to the oxidation efficiency of Elemental Mercury, in flue gas, HCl content is higher, and SCR catalyst is higher to the oxidation efficiency of mercury, and the most coal of China belongs to low chlorine coal, has affected the oxidation of SCR catalyst to mercury.Existing scholar by injecting HCl, Cl in flue gas
2deng the conversion that promotes Elemental Mercury, but need special gas generator, cost costliness, is not easy to realize.
Summary of the invention
The present invention is in order to solve prior art above shortcomings, provide a kind of and realize based on flue gas conditioning the system and method that Elemental Mercury transforms, improve the oxidation efficiency of SCR catalyst to Elemental Mercury, solve the dependence of SCR catalyst oxidation Elemental Mercury to chloride ion content in coal, solve Elemental Mercury in low chlorine flue-gas and removed difficult problem
A kind of system that realizes Elemental Mercury conversion based on flue gas conditioning, comprise boiler, SCR denitrification apparatus, dust arrester, wet desulphurization device, chimney, magnesium chloride solution tank, water pump, air compressor machine, atomizer, the described boiler flue vertical with a section is connected, described vertical flue is connected with SCR denitrification apparatus by the flue of one section of level, SCR denitrification apparatus, dust arrester, wet desulphurization device, chimney connects successively by flue, atomizer is located in the flue before SCR denitrification apparatus, atomizer is by air compressor machine and water pump, water pump connects magnesium chloride solution tank.
Described device also comprises magnesium chloride storage warehouse and batcher, and described magnesium chloride storage warehouse is connected by batcher with magnesium chloride solution tank.
In described magnesium chloride solution tank, the mass concentration of magnesium chloride solution is 30%-35%.
Utilize said system to realize the method that Elemental Mercury transforms, comprise the following steps:
1) coal dust enters in boiler and burns;
2) Hg in fire coal
0along with flue gas enters after flue cooling;
3) flue gas enters SCR denitrification apparatus, in the time that the temperature of flue gas is reduced to 430-450 DEG C, opens water pump, and the magnesium chloride solution that is 30%-35% by concentration is ejected in SCR denitrification apparatus flue before by atomizer;
4) magnesium chloride solution decomposes and produces HCl gas after crystallization under the effect of high-temperature flue gas, and HCl gas enters SCR denitrification apparatus by flue and completes the oxidation to Elemental Mercury;
5) gas after the oxidation of SCR denitrification apparatus passes through dust arrester dedusting successively, after wet desulphurization device desulfurization, discharges through chimney.
Beneficial effect of the present invention:
1, take full advantage of the control action of existing pollutant control appliance to Mercury In Coal Combustion Flue Gas, solved the dependence of SCR catalyst oxidation Elemental Mercury to chloride ion content in coal, solved Elemental Mercury in low chlorine flue-gas and removed difficult problem.
2, improved the chloride ion content in flue gas and do not increased the chlorinity in boiler furnace, having reduced the corrosion to furnace heating surface such as HCl.
3, system is simple, with low cost, and operation is easily gone.
4, can regulate according to coal the emitted dose of magnesium chloride solution, realize the removing of economical and efficient of mercury.
5, magnesium chloride solution spraying can promote the reunion of fine particle thing in flue gas, and dedusting is had to certain help.
6, because magnesium chloride decomposition temperature is lower, can utilize the heat of flue gas to realize the decomposition to magnesium chloride, operating temperature is lower, and consumption is less, controls chloride ion content in flue gas, effectively avoids the corrosion to equipment such as HCl.
Brief description of the drawings
Fig. 1 is invention realizes the system of Elemental Mercury conversion schematic diagram based on flue gas conditioning;
Wherein, 1. boiler, 2. magnesium chloride storage warehouse, 3. batcher, 4. magnesium chloride solution tank, 5. water pump, 6. air compressor machine, 7. atomizer, 8.SCR denitrification apparatus, 9. dust arrester, 10. wet desulphurization device, 11. chimneys.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Embodiment 1
As Fig. 1, a kind of system that realizes Elemental Mercury conversion based on flue gas conditioning, comprise boiler 1, SCR denitrification apparatus 8, dust arrester 9, wet desulphurization device 10, chimney 11, magnesium chloride solution tank 4, water pump 5, air compressor machine 6, atomizer 7, described boiler 1 flue vertical with a section is connected, described vertical flue is connected with SCR denitrification apparatus 8 by the flue of one section of level, SCR denitrification apparatus 8, dust arrester 9, wet desulphurization device 10, chimney 11 connects successively by flue, atomizer 7 is located in the flue before SCR denitrification apparatus 8, atomizer 7 is by air compressor machine 6 and water pump 5, water pump 5 connects magnesium chloride solution tank 4.
Coal dust sprays and enters burning in boiler 1 through burner, and the mercury in fire coal is along with the burning of coal overwhelming majority all enters in flue gas, and the mercury in burner hearth high-temperature flue gas is all Hg
0, Hg
0along with flue gas enter after flue cooling, part Hg
0can be converted into Hg
2+and Hg
p.When entering the front temperature of SCR denitrification apparatus 8, flue gas drops to 430 DEG C, open water pump 5, the magnesium chloride solution that is 30% by concentration is ejected in SCR denitrification apparatus 8 flue before by atomizer 7, under the effect of high-temperature flue gas, magnesium chloride solution evaporates rapidly and forms magnesium chloride crystal, magnesium chloride crystal decomposes generation HCl gas under the effect of high-temperature flue gas, HCl gas promotes the oxidation of SCR catalyst to Elemental Mercury, gas after 8 oxidations of SCR denitrification apparatus passes through dust arrester 9 dedustings successively, after wet desulphurization device 10 desulfurization, discharge through chimney 11.
In the time of 350 DEG C, the resolution ratio of magnesium chloride can reach 80% left and right, can reach 99% resolution ratio at 600 DEG C, simultaneously, SCR catalyst can also promote the hydrolysis of magnesium chloride to produce more HCl, further promote the conversion of Elemental Mercury, under the effect of HCl and SCR catalyst, a large amount of Elemental Mercuries is converted into Hg
2+and Hg
p, Hg
pmainly trapped Hg by dust arrester
2+be dissolved in desulfurization slurry, go out with waste water and solid waste.The emitted dose of magnesium chloride solution can determine according to the coal of burning and the concentration of magnesium chloride, and the solubility of magnesium chloride is larger, and a small amount of HCl gas just can reach higher mercury oxidation efficiency, and a small amount of like this magnesium chloride solution sprays and just can reach good effect.
Embodiment 2
As Fig. 1, a kind of system that realizes Elemental Mercury conversion based on flue gas conditioning, comprise boiler 1, SCR denitrification apparatus 8, dust arrester 9, wet desulphurization device 10, chimney 11, magnesium chloride solution tank 4, water pump 5, air compressor machine 6, atomizer 7, described boiler 1 flue vertical with a section is connected, described vertical flue is connected with SCR denitrification apparatus 8 by the flue of one section of level, SCR denitrification apparatus 8, dust arrester 9, wet desulphurization device 10, chimney 11 connects successively by flue, atomizer 7 is located in the flue before SCR denitrification apparatus 8, atomizer 7 is by air compressor machine 6 and water pump 5, water pump 5 connects magnesium chloride solution tank 4.
Coal dust sprays and enters burning in boiler 1 through burner, and the mercury in fire coal is along with the burning of coal overwhelming majority all enters in flue gas, and the mercury in burner hearth high-temperature flue gas is all Hg
0, Hg
0along with flue gas enter after flue cooling, part Hg
0can be converted into Hg
2+and Hg
p.When entering the front temperature of SCR denitrification apparatus 8, flue gas drops to 400 DEG C, open water pump 5, the magnesium chloride solution that is 35% by concentration is ejected in SCR denitrification apparatus 8 flue before by atomizer 7, under the effect of high-temperature flue gas, magnesium chloride solution evaporates rapidly and forms magnesium chloride crystal, magnesium chloride crystal decomposes generation HCl gas under the effect of high-temperature flue gas, HCl gas promotes the oxidation of SCR catalyst to Elemental Mercury, gas after 8 oxidations of SCR denitrification apparatus passes through dust arrester 9 dedustings successively, after wet desulphurization device 10 desulfurization, discharge through chimney 11.
The present invention is injected in the aqueous solution of magnesium chloride in the flue before SCR denitrification apparatus, magnesium chloride just starts to decompose in the time of 135 DEG C, and discharge hydrogen chloride (HCl) gas, utilize the temperature of flue gas to make the decomposition of magnesium chloride, emit HCl gas, promote the oxidation of SCR catalyst to Elemental Mercury, recycle existing pollutant control appliance and remove the Hg after conversion
2+and Hg
p.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (4)
1. realize based on flue gas conditioning the system that Elemental Mercury transforms for one kind, it is characterized in that, comprise boiler (1), SCR denitrification apparatus (8), dust arrester (9), wet desulphurization device (10), chimney (11), magnesium chloride solution tank (4), water pump (5), air compressor machine (6), atomizer (7), the flue that described boiler (1) is vertical with one section is connected, described vertical gas pass is connected with SCR denitrification apparatus (8) by the flue of one section of level, SCR denitrification apparatus (8), dust arrester (9), wet desulphurization device (10), chimney (11) connects successively by flue, atomizer (7) is located in SCR denitrification apparatus (8) flue before, atomizer (7) is by air compressor machine (6) and water pump (5), water pump (5) connects magnesium chloride solution tank (4).
2. the system that realizes Elemental Mercury conversion based on flue gas conditioning as claimed in claim 1, it is characterized in that, described device also comprises magnesium chloride storage warehouse (2) and batcher (3), and described magnesium chloride storage warehouse (2) is connected by batcher (3) with magnesium chloride solution tank (4).
3. the system that realizes Elemental Mercury conversion based on flue gas conditioning as claimed in claim 1 or 2, is characterized in that, in described magnesium chloride solution tank, the mass concentration of magnesium chloride solution is 30%-35%.
4. utilize any described system of claim 1-3 to realize the method that Elemental Mercury transforms, it is characterized in that, comprise the following steps:
1) coal dust enters burning in boiler (1);
2) Hg in fire coal
0along with flue gas enters after flue cooling;
3) flue gas enters SCR denitrification apparatus (8), in the time that the temperature of flue gas is reduced to 430-450 DEG C, opens water pump (5), and the magnesium chloride solution that is 30%-35% by concentration is ejected in SCR denitrification apparatus (8) flue before by atomizer (7);
4) magnesium chloride solution decomposes and produces HCl gas after crystallization under the effect of high-temperature flue gas, and HCl gas enters SCR denitrification apparatus (8) by flue and completes the oxidation to Elemental Mercury;
5) gas after the oxidation of SCR denitrification apparatus passes through dust arrester (9) dedusting successively, after wet desulphurization device (10) desulfurization, discharges through chimney.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410151046.3A CN103939930A (en) | 2014-04-15 | 2014-04-15 | System and method for achieving elemental mercury conversion based on flue gas conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410151046.3A CN103939930A (en) | 2014-04-15 | 2014-04-15 | System and method for achieving elemental mercury conversion based on flue gas conditioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103939930A true CN103939930A (en) | 2014-07-23 |
Family
ID=51187711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410151046.3A Pending CN103939930A (en) | 2014-04-15 | 2014-04-15 | System and method for achieving elemental mercury conversion based on flue gas conditioning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103939930A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084028A (en) * | 2014-07-25 | 2014-10-08 | 山东大学 | Device and method for oxidizing and removing elemental mercury by using wet flue gas desulfurization wastewater |
| CN104437031A (en) * | 2014-11-05 | 2015-03-25 | 朱忠良 | Iron smelting flue gas treatment method |
| CN105879632A (en) * | 2014-12-16 | 2016-08-24 | 华北电力大学（保定） | Method and system for removing mercury of circulating fluidized bed coal-fired boiler by utilizing white mud |
| CN108479389A (en) * | 2018-04-27 | 2018-09-04 | 华中科技大学 | A kind of flue gas collaboration denitration demercuration system and method |
| CN108732928A (en) * | 2018-09-19 | 2018-11-02 | 南京蔚岚环境技术研究院有限公司 | Hydrocone type industrial source denitration control system and control method |
| CN109107356A (en) * | 2018-08-20 | 2019-01-01 | 彩虹集团（邵阳）特种玻璃有限公司咸阳分公司 | A kind of cover-plate glass tank furnace smoke processing system |
| CN110701621A (en) * | 2019-09-29 | 2020-01-17 | 上海交通大学 | Conditioning agent for waste incineration and method for controlling emission reduction of flue gas mercury and nitrogen oxide by conditioning agent |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002001060A (en) * | 2000-06-27 | 2002-01-08 | Hitachi Zosen Corp | Absorbent and smoke washing method using the absorbent |
| CN101932376A (en) * | 2008-02-28 | 2010-12-29 | 三菱重工业株式会社 | Process and equipment for the treatment of exhaust gas |
| CN102665866A (en) * | 2010-02-25 | 2012-09-12 | 三菱重工业株式会社 | Exhaust gas treatment system, and exhaust gas treatment method |
| US20120244355A1 (en) * | 2009-09-28 | 2012-09-27 | Calgon Carbon Corporation | Sorbent formulation for removal of mercury from flue gas |
| JP2013006143A (en) * | 2011-06-23 | 2013-01-10 | Mitsubishi Heavy Ind Ltd | Exhaust gas treatment apparatus, and orp control method therefor |
| CN103068464A (en) * | 2010-04-07 | 2013-04-24 | 卡尔冈碳素公司 | Methods for removal of mercury from flue gas |
| CN203030173U (en) * | 2013-01-21 | 2013-07-03 | 山东大学 | Device for realizing combined contaminant removal through recycling chlorine elements in coal |
-
2014
- 2014-04-15 CN CN201410151046.3A patent/CN103939930A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002001060A (en) * | 2000-06-27 | 2002-01-08 | Hitachi Zosen Corp | Absorbent and smoke washing method using the absorbent |
| CN101932376A (en) * | 2008-02-28 | 2010-12-29 | 三菱重工业株式会社 | Process and equipment for the treatment of exhaust gas |
| US20120244355A1 (en) * | 2009-09-28 | 2012-09-27 | Calgon Carbon Corporation | Sorbent formulation for removal of mercury from flue gas |
| CN102665866A (en) * | 2010-02-25 | 2012-09-12 | 三菱重工业株式会社 | Exhaust gas treatment system, and exhaust gas treatment method |
| CN103068464A (en) * | 2010-04-07 | 2013-04-24 | 卡尔冈碳素公司 | Methods for removal of mercury from flue gas |
| JP2013006143A (en) * | 2011-06-23 | 2013-01-10 | Mitsubishi Heavy Ind Ltd | Exhaust gas treatment apparatus, and orp control method therefor |
| CN203030173U (en) * | 2013-01-21 | 2013-07-03 | 山东大学 | Device for realizing combined contaminant removal through recycling chlorine elements in coal |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084028A (en) * | 2014-07-25 | 2014-10-08 | 山东大学 | Device and method for oxidizing and removing elemental mercury by using wet flue gas desulfurization wastewater |
| CN104437031A (en) * | 2014-11-05 | 2015-03-25 | 朱忠良 | Iron smelting flue gas treatment method |
| CN105879632A (en) * | 2014-12-16 | 2016-08-24 | 华北电力大学（保定） | Method and system for removing mercury of circulating fluidized bed coal-fired boiler by utilizing white mud |
| CN108479389A (en) * | 2018-04-27 | 2018-09-04 | 华中科技大学 | A kind of flue gas collaboration denitration demercuration system and method |
| CN108479389B (en) * | 2018-04-27 | 2021-03-26 | 华中科技大学 | Flue gas synergistic denitration and demercuration system and method |
| CN109107356A (en) * | 2018-08-20 | 2019-01-01 | 彩虹集团（邵阳）特种玻璃有限公司咸阳分公司 | A kind of cover-plate glass tank furnace smoke processing system |
| CN108732928A (en) * | 2018-09-19 | 2018-11-02 | 南京蔚岚环境技术研究院有限公司 | Hydrocone type industrial source denitration control system and control method |
| CN110701621A (en) * | 2019-09-29 | 2020-01-17 | 上海交通大学 | Conditioning agent for waste incineration and method for controlling emission reduction of flue gas mercury and nitrogen oxide by conditioning agent |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103939930A (en) | System and method for achieving elemental mercury conversion based on flue gas conditioning | |
| CN103239985B (en) | Efficient fuel coal flue gas desulfurizing and hydrargyrum-removing method and device thereof | |
| CN102294171B (en) | Flue gas purifying system | |
| CN205199271U (en) | Middle -size and small -size coal fired boiler flue gas dedusting and desulfurizing denitration is treatment equipment in coordination | |
| CN104984640A (en) | Comprehensive purification process of glass kiln smoke | |
| CN104190253A (en) | Coke oven flue gas SCR denitration system | |
| CN104759192A (en) | Low-cost coal-fired flue gas various pollutant ultralow emission system and low-cost coal-fired flue gas various pollutant ultralow emission method | |
| CN105148709B (en) | A kind of flue gas processing method | |
| CN112121614A (en) | Stable ultralow emission device and method for solid waste incineration flue gas | |
| CN106540500A (en) | A kind of boiler waste gas treating device | |
| CN204996283U (en) | Boiler exhaust -gas treatment apparatus | |
| CN110711470A (en) | Desulfurization and denitrification purification process for incineration flue gas of biomass boiler | |
| CN103727553A (en) | Enhanced system and method for adsorption removal of mercury in coal-fired flue gas | |
| CN201572607U (en) | Dust removal and denitration composite device for coal smoke | |
| CN205102149U (en) | Multiple gas cleaning is demercuration device in coordination | |
| CN206064141U (en) | A kind of coal-fired flue-gas treatment and purification device | |
| CN208809774U (en) | A kind of ultra-clean purification system of flue gas | |
| CN202136916U (en) | Flue gas purification system | |
| CN110052155A (en) | A kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal | |
| CN102500208A (en) | Utilization method and device for wet flue gas desulfurization wastewater | |
| CN204582930U (en) | A kind of low cost coal-fired flue-gas multiple pollutant minimum discharge system | |
| CN105222143A (en) | Mercury removal device and method are worked in coordination with in one kind of multiple gas cleanings | |
| CN203635061U (en) | Tail gas purification device | |
| CN109126431A (en) | The device and method of liquid phase adsorption formula oxidation-reduction method denitrating flue gas | |
| CN211328808U (en) | Negative pressure flue gas purification device of thermal power plant |
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: 20140723 |
|
| RJ01 | Rejection of invention patent application after publication |