CN203771437U - Device achieving elemental mercury transformation based on flue gas conditioning - Google Patents
Device achieving elemental mercury transformation based on flue gas conditioning Download PDFInfo
- Publication number
- CN203771437U CN203771437U CN201420181352.7U CN201420181352U CN203771437U CN 203771437 U CN203771437 U CN 203771437U CN 201420181352 U CN201420181352 U CN 201420181352U CN 203771437 U CN203771437 U CN 203771437U
- Authority
- CN
- China
- Prior art keywords
- flue gas
- mercury
- magnesium chloride
- elemental mercury
- coal
- 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.)
- Expired - Lifetime
Links
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 57
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000003546 flue gas Substances 0.000 title claims abstract description 38
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 13
- 230000009466 transformation Effects 0.000 title abstract 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 86
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000428 dust Substances 0.000 claims description 14
- 229910052753 mercury Inorganic materials 0.000 abstract description 31
- 239000003054 catalyst Substances 0.000 abstract description 15
- 239000003245 coal Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 6
- 239000000460 chlorine Substances 0.000 abstract description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052801 chlorine Inorganic materials 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 4
- 239000003595 mist Substances 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 13
- 230000003647 oxidation Effects 0.000 description 13
- 238000007254 oxidation reaction Methods 0.000 description 13
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 12
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008645 Chenopodium bonus henricus Nutrition 0.000 description 1
- 244000138502 Chenopodium bonus henricus Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 231100000704 bioconcentration Toxicity 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model discloses a device achieving elemental mercury transformation based on flue gas conditioning. The device 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. The boiler is connected with the SCR denitration device, the SCR denitration device is connected with the dedusting device, the dedusting device is connected with the wet desulphurization device, the wet desulphurization device is connected with the chimney, the atomizing nozzle is arranged on a flue in front of the SCR denitration device, the atomizing nozzle is connected with the air compressor, the air compressor is connected with the water pump, and the water pump is connected with the magnesium chloride solution tank. The device achieving elemental mercury transformation based on flue gas conditioning is simple in system, low in cost and easy to operate, can achieve economical and high-efficient removal of mercury by adjusting the mist spray flow, takes full advantages of the control effect of an existing pollutant controller on the mercury in the coal-fired flue gas, overcomes the dependence of the SCR catalyst oxidizing elemental mercury on the chlorine content in the coal, and solves the problem of difficult removal of the elemental mercury in low chloride coal-fired flue gas.
Description
Technical field
The utility model belongs to environmental protection technical field, is specifically related to a kind of device of 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, divalence mercury Hg wherein
2+very easily water-soluble and easily by particles such as flying dusts, adsorbed, 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 by existing pollutant control appliance, caught 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 that mercury pollution is controlled.
The control method of mercury pollution mainly contains adsorbent absorption method and catalytic oxidation at present, and the adsorbent method that the active carbon injection of take is 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, in conjunction with wet desulphurization equipment, combine and remove mercury and need not increase new equipment, cost is lower, the main trend that Jiang Shi coal-burning power plant mercury pollution is controlled, 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 is expensive, is not easy to realize.
Utility model content
The utility model is in order to solve prior art above shortcomings, provide a kind of and realize based on flue gas conditioning the device that Elemental Mercury transforms, improve the oxidation efficiency of SCR catalyst to Elemental Mercury, overcome 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.
The purpose of this utility model is to adopt following technical proposals to realize:
A kind of device of realizing 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, described boiler is connected with SCR denitrification apparatus, SCR denitrification apparatus is connected with dust arrester, dust arrester is connected with wet desulphurization device, wet desulphurization device is connected with chimney, atomizer is located at the flue before SCR denitrification apparatus, atomizer is connected with air compressor machine, air compressor machine is connected with water pump, and water pump is connected with magnesium chloride solution tank.
Said apparatus also comprises magnesium chloride storage warehouse and batcher, and described magnesium chloride storage warehouse is connected by batcher with magnesium chloride solution tank.
The beneficial effects of the utility model:
1, take full advantage of the control action of existing pollutant control appliance to Mercury In Coal Combustion Flue Gas, overcome 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 according to coal, regulate 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 resolution ratio is higher, decomposition temperature is lower, can utilize the heat of flue gas to realize the decomposition to magnesium chloride, and operating temperature is lower, and consumption is less, controls chloride ion content in flue gas, effectively avoids the corrosion to equipment such as HCl.
Accompanying drawing explanation
Fig. 1 is that the utility model is realized the schematic diagram of the device of Elemental Mercury conversion 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.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Embodiment 1
As Fig. 1, a kind of device of realizing Elemental Mercury conversion based on flue gas conditioning, comprise boiler 1, SCR denitrification apparatus 8, dust arrester 9, wet desulphurization device 10 and chimney 11, boiler 1 is connected with SCR denitrification apparatus 8, SCR denitrification apparatus 8 is connected with dust arrester 9, dust arrester 9 is connected with wet desulphurization device 10, wet desulphurization device 10 is connected with chimney 11, also comprise magnesium chloride solution tank 4, water pump 5, air compressor machine 6, atomizer 7, described atomizer 7 is located at the flue before SCR denitrification apparatus 8, atomizer 7 is connected with air compressor machine 6, air compressor machine 6 is connected with water pump 5, water pump 5 is connected with magnesium chloride solution tank 4, magnesium chloride storage warehouse 2 is connected by batcher 3 with 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 dropped to 430 ℃, 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, and HCl gas promotes the oxidation of SCR catalyst to Elemental Mercury.
In the time of 350 ℃, the resolution ratio of magnesium chloride can reach 80% left and right, at 600 ℃, can reach 99% resolution ratio, 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 by dust arrester, trapped Hg
2+be dissolved in desulfurization slurry, with waste water and solid waste, go out.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 just can reach good effect.
Embodiment 2
As Fig. 1, a kind of device of realizing 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, boiler 1 is connected with SCR denitrification apparatus 8, SCR denitrification apparatus 8 is connected with dust arrester 9, dust arrester 9 is connected with wet desulphurization device 10, wet desulphurization device 10 is connected with chimney 11, atomizer 7 is located at the flue before SCR denitrification apparatus 8, atomizer 7 is connected with air compressor machine 6, air compressor machine 6 is connected with water pump 5, water pump 5 is connected with magnesium chloride solution tank 4, magnesium chloride storage warehouse 2 is connected by batcher 3 with 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 dropped to 400 ℃, 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, and HCl gas promotes the oxidation of SCR catalyst to Elemental Mercury.
The utility model 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 ℃, and discharge hydrogen chloride (HCl) gas, utilize the temperature of flue gas that magnesium chloride is decomposed, 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.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present utility model is described; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (2)
1. based on flue gas conditioning, realize the device that Elemental Mercury transforms for one kind, it is characterized in that, describedly based on flue gas conditioning, realize the device that Elemental Mercury transforms and 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) is connected with SCR denitrification apparatus (8), SCR denitrification apparatus (8) is connected with dust arrester (9), dust arrester (9) is connected with wet desulphurization device (10), wet desulphurization device is connected with (10) chimney (11), atomizer (7) is located at SCR denitrification apparatus (8) flue before, atomizer (7) is connected with air compressor machine (6), air compressor machine (6) is connected with water pump (5), water pump (5) is connected with magnesium chloride solution tank (4).
2. as claimed in claim 1ly based on flue gas conditioning, realize the device that Elemental Mercury transforms, 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420181352.7U CN203771437U (en) | 2014-04-15 | 2014-04-15 | Device achieving elemental mercury transformation based on flue gas conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420181352.7U CN203771437U (en) | 2014-04-15 | 2014-04-15 | Device achieving elemental mercury transformation based on flue gas conditioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203771437U true CN203771437U (en) | 2014-08-13 |
Family
ID=51288626
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420181352.7U Expired - Lifetime CN203771437U (en) | 2014-04-15 | 2014-04-15 | Device achieving elemental mercury transformation based on flue gas conditioning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203771437U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587225A (en) * | 2016-12-07 | 2017-04-26 | 浙江德创环保科技股份有限公司 | Zero discharge process for desulfurization wastewater |
-
2014
- 2014-04-15 CN CN201420181352.7U patent/CN203771437U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587225A (en) * | 2016-12-07 | 2017-04-26 | 浙江德创环保科技股份有限公司 | Zero discharge process for desulfurization wastewater |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |