CN103831000B - A kind of coal-fired flue-gas synergistic oxidation mercury removal device and demercuration method - Google Patents
A kind of coal-fired flue-gas synergistic oxidation mercury removal device and demercuration method Download PDFInfo
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- CN103831000B CN103831000B CN201310681823.0A CN201310681823A CN103831000B CN 103831000 B CN103831000 B CN 103831000B CN 201310681823 A CN201310681823 A CN 201310681823A CN 103831000 B CN103831000 B CN 103831000B
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- Prior art keywords
- solution
- spray gun
- calcium bromide
- coal
- fired flue
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000003546 flue gas Substances 0.000 title claims abstract description 20
- 230000003647 oxidation Effects 0.000 title claims abstract description 20
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 20
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910001622 calcium bromide Inorganic materials 0.000 claims abstract description 40
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 claims abstract description 39
- 239000007921 spray Substances 0.000 claims abstract description 36
- 238000002360 preparation method Methods 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000002817 coal dust Substances 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000010408 sweeping Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 11
- 239000003463 adsorbent Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000031709 bromination Effects 0.000 description 2
- 238000005893 bromination reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The present invention discloses a kind of coal-fired flue-gas synergistic oxidation mercury removal device and demercuration method.This device comprises solution preparation tank, and the entrance of described solution preparation tank connects pure water adding equipment calcium bromide pressed powder adding equipment, and the output channel of described solution preparation tank is provided with high-pressure frequency-conversion measuring pump, and the end of described output channel is provided with solution spray gun.The method comprises: 1) in solution preparation tank, add pure water and calcium bromide pressed powder, and preparation quality mark is the calcium bromide solution of 10-30%; 2) by high-pressure frequency-conversion measuring pump, calcium bromide solution is squeezed in solution spray gun; 3) by solution spray gun, calcium bromide solution is sprayed onto in coal dust, to carry out synergistic oxidation demercuration.The present invention effectively can control the nonvalent mercury concentration in coal-fired flue-gas, has the features such as system is simple, convenient, operating cost is low, maintenance management is easy, easy promotion and application, has highly application value.
Description
Technical field
The invention belongs to purifying coal-fired flue gas technical field, relate to a kind of coal-burning power plant frame-type synergistic oxidation mercury removal device and demercuration method, effectively can control the nonvalent mercury concentration in coal-fired flue-gas, increase the collaborative demercuration ability of wet desulfurization system.
Background technology
Coal-fired flue-gas heavy metal Hg pollutes has become the another great society focus of attention.2011, new edition " fossil-fuel power plant atmospheric pollutant emission standard " regulation of Environment Protect in China cloth promulgated by the ministries or commissions of the Central Government, performed the standard of coal-fired plant flue gas mercury emissions limit value 30 μ g/m3 from 2015.Like this, for the coal-burning power plant that partial fume mercury content exceeds standard, determine just to seem the mercury removal technology that a set of economy and practicality have concurrently very urgent.
Conventional demercuration technology is adsorbent trace spraying technique.In the flue that the various adsorbents that are representative with bromination active carbon are normally injected into before and after air preheater by Geldart-D particle and system of evenly sending forth by this technology, trapped by deduster with adsorbent after mercury is adsorbed.Technique is with strong points, instant effect, but operating cost is high, is a no small expense to coal-burning power plant.In addition also have absorption tower internal oxidition technology, be in desulphurization system absorption tower, spray into the absorbent with strong oxidizing property, nonvalent mercury is converted into bivalent mercury, to improve wet desulfurization system to mercuric detersive efficiency, reduce the overall concentration of emission of gas mercury.But this kind of way one is due to the generation of back reaction, be not easy to control, two owing to may affect the normal operation of desulphurization system and more difficult realization.
Summary of the invention
The present invention is directed to the problems referred to above, provide a set of simple solvent preparation and automatic spraying system, effectively can control the nonvalent mercury concentration in coal-fired flue-gas, reaching the simplest mode of use increases the object that wet desulfurization system works in coordination with demercuration ability to greatest extent.
The technical solution used in the present invention is:
A kind of coal-fired flue-gas synergistic oxidation mercury removal device, comprise solution preparation tank, the entrance of described solution preparation tank connects pure water adding equipment and calcium bromide pressed powder adding equipment, the output channel of described solution preparation tank is provided with high-pressure frequency-conversion measuring pump, and the end of described output channel connects solution spray gun.
Further, agitator is provided with in described solution preparation tank.
Further, the control system of described solution spray gun and the mercury measurement device of coal-fired flue-gas chain, by start and stop and the straying quatity of solution spray gun described in measurement data FEEDBACK CONTROL.
Further, described solution spray gun has on-line auto-cleaning device and blowback sweeping device, realizes cleaning and blowback automatically respectively and sweeps function.
Further, described high-pressure metering pump is the using and the reserved mode, ensures the normal work of under any circumstance whole system.
Further, described output channel is provided with and controls ball valve, check-valves and relief valve.
Utilize said apparatus to carry out a method for synergistic oxidation demercuration to coal-fired flue-gas, its step comprises:
1) in solution preparation tank, add pure water and calcium bromide pressed powder, preparation quality mark is the calcium bromide solution of 10-30%;
2) by high-pressure frequency-conversion measuring pump, calcium bromide solution is squeezed in solution spray gun;
3) by solution spray gun, calcium bromide solution is sprayed onto in coal dust, to carry out synergistic oxidation demercuration.
Further, when step 3) carries out demercuration, the concentration of calcium bromide in coal dust (mass fraction) is 5-30ppm.
At present more traditional demercuration mode is all before deduster, spray into the adsorbent that active carbon, living beings glue etc. has a strong absorption property carry out adsorbing and removing to the heavy metal in flue gas, also have and spray into the adsorbent technique that bromination active carbon etc. has oxidation susceptibility, to meet the needs of efficient removal gas mercury.But these techniques all have operating cost costliness, adsorbent consumption and have the shortcomings such as adverse effect greatly, to ash content comprehensive utilization performance.The present invention utilizes a whole set of frame-like arrangement such as solution preparation tank, solid throwing device, preparation tank agitator, high-pressure frequency-conversion measuring pump, solution spray gun, is sprayed onto in coal dust by calcium bromide solvent and goes, realize the object of demercuration.Solution is formed by calcium bromide pressed powder automatic adding device and pure water preparation, by squeezing in solution spray gun after high-pressure frequency-conversion measuring pump.
Coal-burning power plant of the present invention synergistic oxidation mercury removal device, the overall design in frame-type, apply a set of simple solution preparation and spraying system to reach same object, there is the features such as system is simple, convenient, operating cost is low, maintenance management is easy, easy promotion and application, and any impact is not produced on the comprehensive utilization performance of ash content, there is high application value.Different from existing demercuration mode, the present invention can carry out the flexible combination of different modes according to actual needs.Due to by little for the system footprint of frame-type, easy for installation, according to actual conditions, one or more sets systems can be optionally installed; Also according to actual items demand, native system can be arranged on multiple region flexibly, realize the object of cooperation-removal gas mercury.
Accompanying drawing explanation
Fig. 1 is the structural representation that embodiment center posture works in coordination with mercury removal device.
Fig. 2 is utilize frame-type to work in coordination with in embodiment flow chart of steps that mercury removal device carries out demercuration.
Wherein: 1-NaOH solution tank NaOH; 2-agitator; 3-control ball valve; 4-check-valves; 5-high-pressure metering pump; 6-relief valve; 7-automatic spray gun; 8-pure water adding equipment; 9-calcium bromide pressed powder adding equipment.
Detailed description of the invention
Below by specific embodiments and the drawings, the present invention will be further described.
Fig. 1 is the structural representation that embodiment center posture works in coordination with mercury removal device, comprises NaOH solution tank NaOH 1, agitator 2, controls ball valve 3, check-valves 4, high-pressure metering pump 5, relief valve 6, automatic spray gun 7, pure water adding equipment 8 and calcium bromide pressed powder adding equipment 9.Pure water throwing device 8 is connected the entrance of solution preparation tank 1 with calcium bromide pressed powder throwing device 9, is respectively used in solution preparation tank 1, add pure water and calcium bromide pressed powder, for the preparation of calcium bromide solution.Agitator 2 is provided with in solution preparation tank 1.High-pressure metering pump 5 is located on the output channel of solution preparation tank 1, and the end of output channel is provided with solution spray gun 7.Solution is formed by calcium bromide pressed powder and pure water preparation, by squeezing in solution spray gun after high-pressure frequency-conversion measuring pump.
Wherein, calcium bromide pressed powder throwing device 9 has automatic feeding function, can adopt the proof dry powder feeding device that existing market can have been bought.
Wherein, control system and the gas mercury measurement mechanism of solution spray gun 7 are chain, by start and stop and the straying quatity of solution spray gun described in measurement data FEEDBACK CONTROL.The control system of solution spray gun 7 can adopt existing techniques in realizing coordinated signals.Gas mercury measurement mechanism can adopt the equipment such as CEMS on-line measurement device.Further, solution spray gun 7 has on-line auto-cleaning and function is swept in blowback.As shown in Figure 1, solution spray gun 7 place can lead to as wash water and air, sweeps with blowback for realizing getting express developed online.This function can adopt device of the prior art to realize.
Wherein, as shown in Figure 1, high-pressure metering pump is the using and the reserved mode, namely adopts the output channel that two in parallel, ensures the normal work of under any circumstance whole system.Each output channel is equipped with and controls ball valve 3, check-valves 4 and relief valve 6, for controlling solution flowing, wherein control ball valve 3 for controlling flow, check-valves 4 is for the protection of measuring pump, and relief valve 6 is for ensureing safe operation.
Utilize said apparatus to carry out the step of synergistic oxidation demercuration as shown in Figure 2 to coal-fired flue-gas, be described as follows:
1) in solution preparation tank, add pure water and calcium bromide pressed powder, stirred by agitator, preparation concentration is the calcium bromide solution of 10-30%;
2) by high-pressure frequency-conversion measuring pump, calcium bromide solution is squeezed in solution spray gun;
3) calcium bromide solution to be sprayed onto in coal dust by solution spray gun and to go, the concentration of calcium bromide in coal dust (mass fraction) is 5-30ppm, by oxidation, increases nonvalent mercury and changes into mercuric ability, to carry out synergistic oxidation demercuration.
Three specific embodiments are provided below:
Embodiment 1:
The concentration of the calcium bromide solution of preparation is 10%(mass fraction), the concentration of calcium bromide in coal dust is 5ppm(mass fraction), mercury in flue gas concentration is 30 μ g/m
3, after carrying out oxidation demercuration, concentration is 8 μ g/m
3.
Embodiment 2:
The concentration of the calcium bromide solution of preparation is 20%(mass fraction), the concentration of calcium bromide in coal dust is 10ppm(mass fraction), the concentration of mercury in flue gas is 25 μ g/m
3, carrying out the concentration after being oxidized demercuration is 5.88 μ g/m
3.
Embodiment 3:
The concentration of the calcium bromide solution of preparation is 30%(mass fraction), the concentration of calcium bromide in coal dust is 30ppm(mass fraction), the concentration of mercury in flue gas is 28 μ g/m
3, carrying out the concentration after being oxidized demercuration is 6.5 μ g/m
3.
Above embodiment is only in order to illustrate technical scheme of the present invention but not to be limited; those of ordinary skill in the art can modify to technical scheme of the present invention or equivalent replacement; and not departing from the spirit and scope of the present invention, protection scope of the present invention should be as the criterion with described in claim.
Claims (8)
1. a coal-fired flue-gas synergistic oxidation mercury removal device, is characterized in that, comprises solution preparation tank, and the entrance of described solution preparation tank connects pure water adding equipment and calcium bromide pressed powder adding equipment, for the preparation of calcium bromide solution; The output channel of described solution preparation tank is provided with high-pressure frequency-conversion measuring pump, and the end of described output channel connects solution spray gun; Calcium bromide solution is squeezed in solution spray gun by described high-pressure frequency-conversion measuring pump, and then is sprayed onto in coal dust by solution spray gun by calcium bromide solution, to carry out synergistic oxidation demercuration; The control system of described solution spray gun and the mercury measurement device of coal-fired flue-gas chain, by start and stop and the straying quatity of solution spray gun described in measurement data FEEDBACK CONTROL.
2. device as claimed in claim 1, is characterized in that: be provided with agitator in described solution preparation tank.
3. coal-fired flue-gas synergistic oxidation mercury removal device as claimed in claim 1, is characterized in that: described solution spray gun has on-line auto-cleaning device.
4. coal-fired flue-gas synergistic oxidation mercury removal device as claimed in claim 1, is characterized in that: described solution spray gun has blowback sweeping device.
5. device as claimed in claim 1, is characterized in that: described high-pressure frequency-conversion measuring pump is the using and the reserved mode.
6. device as claimed in claim 1, is characterized in that: described output channel is provided with and controls ball valve, check-valves and relief valve.
7. adopt device described in claim 1 to carry out a method for synergistic oxidation demercuration to coal-fired flue-gas, its step comprises:
1) in solution preparation tank, add pure water and calcium bromide pressed powder, preparation quality mark is the calcium bromide solution of 10-30%;
2) by high-pressure frequency-conversion measuring pump, calcium bromide solution is squeezed in solution spray gun;
3) by solution spray gun, calcium bromide solution is sprayed onto in coal dust, to carry out synergistic oxidation demercuration; The control system of described solution spray gun and the mercury measurement device of coal-fired flue-gas chain, by start and stop and the straying quatity of solution spray gun described in measurement data FEEDBACK CONTROL.
8. method as claimed in claim 7, is characterized in that: step 3) when carrying out demercuration, the mass fraction of calcium bromide in coal dust is 5-30ppm.
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| CN201310681823.0A CN103831000B (en) | 2013-12-12 | 2013-12-12 | A kind of coal-fired flue-gas synergistic oxidation mercury removal device and demercuration method |
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| CN201310681823.0A CN103831000B (en) | 2013-12-12 | 2013-12-12 | A kind of coal-fired flue-gas synergistic oxidation mercury removal device and demercuration method |
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| CN103831000B true CN103831000B (en) | 2016-04-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104874269B (en) * | 2015-05-29 | 2017-01-18 | 山西大学 | System and method for simultaneous online monitoring of flue gas mercury content and mercury removal |
| CN107029530A (en) * | 2017-04-26 | 2017-08-11 | 北京清新环境技术股份有限公司 | A kind of container-type additive solution dosing system for flue gas demercuration |
| CN114042378B (en) * | 2021-11-22 | 2022-05-24 | 浙江大学 | A method for removing mercury from hazardous waste incineration flue gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120174A (en) * | 2011-01-19 | 2011-07-13 | 重庆大学 | Method for modifying coal ash based mercury-removing adsorbing agent |
| CN102343200A (en) * | 2011-09-21 | 2012-02-08 | 中国华能集团清洁能源技术研究院有限公司 | Method and system for efficiently controlling mercury pollution of coal-fired power plant at low cost |
| CN203710894U (en) * | 2013-12-12 | 2014-07-16 | 大唐科技产业有限公司 | Coal-fired flue gas synergistic oxidation demercuration device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060205592A1 (en) * | 2005-03-14 | 2006-09-14 | Chien-Chung Chao | Catalytic adsorbents for mercury removal from flue gas and methods of manufacture therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120174A (en) * | 2011-01-19 | 2011-07-13 | 重庆大学 | Method for modifying coal ash based mercury-removing adsorbing agent |
| CN102343200A (en) * | 2011-09-21 | 2012-02-08 | 中国华能集团清洁能源技术研究院有限公司 | Method and system for efficiently controlling mercury pollution of coal-fired power plant at low cost |
| CN203710894U (en) * | 2013-12-12 | 2014-07-16 | 大唐科技产业有限公司 | Coal-fired flue gas synergistic oxidation demercuration device |
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Inventor after: Zhou Ye Inventor after: Li Junru Inventor after: Song Hongbing Inventor after: Xia Huaixiang Inventor before: Zhou Ye Inventor before: Song Hongbing Inventor before: Xia Huaixiang |
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