CN103592159A - Research method of mercury form transformation during combustion process - Google Patents
Research method of mercury form transformation during combustion process Download PDFInfo
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- CN103592159A CN103592159A CN201310171437.7A CN201310171437A CN103592159A CN 103592159 A CN103592159 A CN 103592159A CN 201310171437 A CN201310171437 A CN 201310171437A CN 103592159 A CN103592159 A CN 103592159A
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Abstract
The invention belongs to the safe and clean energy utilization field, and concretely relates to a method for studying mercury element form transformation during combustion process by utilization of anti-diffusion flame. Flame in stable combustion is generated through an anti-diffusion flame combustor. Mercury in forms of steam and with a trace amount are introduced into the combustor with nitrogen as a carrier gas, and participate in combustion. Mercury changes with the flame temperature and combustion time during the combustion process. Different points collecting samples are arranged along the axial direction of the flame. The forms of mercury in the collected samples at each sample collecting point are detected and analyzed, and the forms of mercury at different flame temperatures and flame positions ( corresponding different sample collecting points along the axial direction of the flame ) are obtained. The information of mercury form transformation during combustion process can be obtained by utilization of the method, and the problems can be solved that samples are difficult to collect and original data of mercury form transformation cannot be obtained during boiler combustion process. The method is also suitable for analysis and study of form transformation of other trace heavy metal elements such as arsenic, cadmium, lead, zinc and the like during combustion process.
Description
Technical field
The invention belongs to safety and clean energy resource utilizes field, be specifically related to a kind of method that adopts mercury element Forms Transformation in diffusion flame research of combustion.
Background technology
Mercury is one of the most volatile trace element in fossil fuel, is also one of poisonous air pollutants (HAPs) of delimiting in U.S. Clean Air Act amendment (CAAA).Mercury in atmosphere is mainly emitted by fossil fuel especially burning of coal and gasification.But at present deep not enough to the understanding of the chemical speciation rule of Mercury In Coal Combustion Flue Gas, the mercury of different chemical form has different physics, chemistry and biological nature, and in understanding coal-fired process, the Forms Transformation rule of mercury, enrichment discipline etc. have important meaning for form distribution, emission control, toxicity and the mercury pollution assessment etc. of mercury.
With regard to current all for mercury the research of Forms Transformation in combustion of fossil fuel report, two kinds of methods of main employing are studied, comprise: (1) is analyzed the form of mercury in fire coal before burning, as the method that adopts microwave digestion clears up after sample, adopt Cold Atomic Fluorescent Mercury method (CVAFS) to analyze mercury shape; (2) after burning, the form of mercury is analyzed, general employing liquid-absorbant, solid adsorbent collected specimens from flue gas, then the sample collecting is adopted the methods such as cold vapor atomic absorption spectroscopy (CVAAS), By Naa (INAA) measure.But because sample difficult problem in existence burning, so be difficult to obtain the information of mercury Forms Transformation in combustion process, therefore lack the research to the Forms Transformation aspect of mercury in combustion process, also there is no relevant research report.
The present invention generates flame with gaseous diffusion flame burner, and flame is inner has more similar Characteristics of The Distribution of Temperature to coal-burning boiler.Mercury vapour is quantitatively carried under one's arms and entered flame participation combustion process with carrier gas, in the flame height standard method Ontario Hydro sampling that diverse location place (flame presents different Temperature Distribution) adopts American Society for testing and materials (ASTM) to provide vertically, the form of the mercury gathering can corresponding reflection boiler combustion process in the original form of mercury after different temperature of combustion, different mechanism of combustion, solved the difficult problem that on-line sampling in boiler combustion is difficult, can not study the Forms Transformation of mercury in combustion process.
Summary of the invention
In order to solve on-line sampling difficulty in boiler combustion process, can not to obtain the problem that mercury shape transforms raw data, the invention provides the research method that in a kind of combustion process, mercury shape transforms, to realize the on-line sampling of mercury in combustion process and the research of Forms Transformation rule thereof.
Main contents of the present invention comprise:
1. the research method that in combustion process, mercury shape transforms, is characterized in that, comprises following content:
(1) take methane (or ethene) forms stable diffusion flame as fuel, oxygen (or air) as oxygenant in diffusion flame burners.
(2) flow of fuel metering, oxygenant, measures and obtains expection, rational Flame Temperature Distribution.
(3) nitrogen buffer gas, the mercury that mercury vapour generator is produced is quantitatively carried under one's arms and is participated in burning to diffusion flame.And as required, regulate the concentration of mixing of mercury.
2. the research method that in a kind of combustion process according to claim 1, mercury shape transforms, is characterized in that, along the axial selection of combustion flame and suitable sampled point is set, the mercury at combustion process Flame diverse location place is sampled.
3. the research method that in a kind of combustion process according to claim 1, mercury shape transforms, it is characterized in that, by definite fuel flow rate, oxidizer flow rate, obtain smooth combustion flame and the Flame Temperature Distribution of level altitude, accurate quantification mercury mixes concentration again, can access mercury CONCENTRATION DISTRIBUTION stable in flame, reproducible.
4. the research method that in a kind of combustion process according to claim 2, mercury shape transforms, it is characterized in that, the standard method Ontario Hydro sampling that the collection of mercury sample can adopt American Society for testing and materials (ASTM) to provide, then adopt the methods such as cold vapor atomic absorption spectroscopy (CVAAS), By Naa (INAA) to carry out determination and analysis to its form and concentration.
5. the research method that in a kind of combustion process according to claim 4, mercury shape transforms, it is characterized in that, mercury sample under different sampled points (being different temperature of combustion and mechanism of combustion) is compared and analyzed, can study and disclose Forms Transformation characteristic and the rule of mercury in combustion process.
6. the method for mercury shape Study on Transformation in a kind of combustion process according to claim 1, is characterized in that, is equally applicable to Forms Transformation analysis and the research of other trace heavy metals in combustion process such as arsenic, cadmium, lead, zinc.
Beneficial effect:
The present invention has following innovative point and advantage:
1. adopt the Forms Transformation of mercury in diffusion flame research of combustion, the original form of mercury after different temperature of combustion, different mechanism of combustion in the corresponding reflection of the form boiler combustion process of the mercury gathering, has solved the difficult problem that on-line sampling in boiler combustion is difficult, can not study the Forms Transformation of mercury in combustion process.
2. be applicable to Forms Transformation analysis and the research of other trace heavy metals in combustion process such as arsenic, cadmium, lead, zinc.
Accompanying drawing explanation:
Fig. 1 is mercury shape Study on Transformation method schematic diagram in a kind of combustion process.Flame sampled point grid in figure shown in (a) arranges according to temperature distribution history.In figure, diffusion flame burners shown in (b) is comprised of 2 layers of concentric pipe, and skin passes to oxygenant, and internal layer passes to fuel, mercury vapour and carrier gas.Sampling thief is connected to form by the ceramic pipe of internal diameter 1mm and the copper pipe of internal diameter 5mm, and then is connected with Ontario Hydro sampling series, and afterbody sampling vacuum pump provides sampling power.The sampling location of sampling thief is accurately located by three-dimensional mobile platform.
Specific implementation process:
1. the source of the gas of opening gaseous fuel, trace fuels, and opens oxygenant source of the gas simultaneously, and igniting forms flammule.
2. adjustments of gas fuel and oxidizer flow rate, to set-point, form the flame of smooth combustion.
3. open mercury vapour generator, adjust the specified rate of mercury, open carrier gas source of the gas, mercury is carried under one's arms to combustion flame.
4. adjust three-dimensional mobile platform, sampling thief is accurately positioned to pre-sampled point, open vacuum pump and adopt Ontario Hydro method to sample.
5. pair sample gathering carries out form, the content analysis of mercury.
6. as described in step 4,5, adjust three-dimensional mobile platform and sample respectively and carry out form and the assay of mercury in default all sample point.
7. sum up and disclose Forms Transformation characteristic and the rule of mercury in combustion process.
Claims (6)
1. the research method that in combustion process, mercury shape transforms, is characterized in that, comprises following content:
(1) take methane (or ethene) forms stable diffusion flame as fuel, oxygen (or air) as oxygenant in diffusion flame burners.
(2) flow of fuel metering, oxygenant, measures and obtains expection, rational Flame Temperature Distribution.
(3) nitrogen buffer gas, the mercury that mercury vapour generator is produced is quantitatively carried under one's arms and is participated in burning to diffusion flame.And as required, regulate the concentration of mixing of mercury.
2. the research method that in a kind of combustion process according to claim 1, mercury shape transforms, is characterized in that, along the axial selection of combustion flame and suitable sampled point is set, the mercury at combustion process Flame diverse location place is sampled.
3. the research method that in a kind of combustion process according to claim 1, mercury shape transforms, it is characterized in that, by definite fuel flow rate, oxidizer flow rate, obtain smooth combustion flame and the Flame Temperature Distribution of level altitude, accurate quantification mercury mixes concentration again, can access mercury CONCENTRATION DISTRIBUTION stable in flame, reproducible.
4. the research method that in a kind of combustion process according to claim 2, mercury shape transforms, it is characterized in that, the standard method Ontario Hydro sampling that the collection of mercury sample can adopt American Society for testing and materials (ASTM) to provide, then adopt the methods such as cold vapor atomic absorption spectroscopy (CVAAS), By Naa (INAA) to carry out determination and analysis to its form and concentration.
5. the research method that in a kind of combustion process according to claim 4, mercury shape transforms, it is characterized in that, mercury sample under different sampled points (being different temperature of combustion and mechanism of combustion) is compared and analyzed, can study and disclose Forms Transformation characteristic and the rule of mercury in combustion process.
6. the method for mercury shape Study on Transformation in a kind of combustion process according to claim 1, is characterized in that, is equally applicable to Forms Transformation analysis and the research of other trace heavy metals in combustion process such as arsenic, cadmium, lead, zinc.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548429A (en) * | 2015-12-04 | 2016-05-04 | 通威股份有限公司 | Method for simultaneously detecting organic arsenic and inorganic arsenic in aquatic feed |
| CN106093282A (en) * | 2016-06-20 | 2016-11-09 | 中国科学院工程热物理研究所 | The device of solid fuel ignition product at on-line checking different spatial |
| CN106442606A (en) * | 2016-09-28 | 2017-02-22 | 华中科技大学 | Method and device for recognizing mercury forms |
| CN109253994A (en) * | 2018-10-31 | 2019-01-22 | 中国石油天然气股份有限公司 | A kind of oil-gas-source mercury isotope detection method and device |
| CN109253996A (en) * | 2018-10-31 | 2019-01-22 | 中国石油天然气股份有限公司 | A kind of the mercury isotope test method and its device of crude oil |
| CN111721599A (en) * | 2020-06-23 | 2020-09-29 | 南京大学 | Atomic-level material beam variable-temperature liquid coating collection method and device in vacuum |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548429A (en) * | 2015-12-04 | 2016-05-04 | 通威股份有限公司 | Method for simultaneously detecting organic arsenic and inorganic arsenic in aquatic feed |
| CN106093282A (en) * | 2016-06-20 | 2016-11-09 | 中国科学院工程热物理研究所 | The device of solid fuel ignition product at on-line checking different spatial |
| CN106093282B (en) * | 2016-06-20 | 2019-08-13 | 中国科学院工程热物理研究所 | The device of solid fuel ignition product at on-line checking different spatial |
| CN106442606A (en) * | 2016-09-28 | 2017-02-22 | 华中科技大学 | Method and device for recognizing mercury forms |
| CN106442606B (en) * | 2016-09-28 | 2019-01-15 | 华中科技大学 | A kind of method and apparatus identifying mercury shape |
| CN109253994A (en) * | 2018-10-31 | 2019-01-22 | 中国石油天然气股份有限公司 | A kind of oil-gas-source mercury isotope detection method and device |
| CN109253996A (en) * | 2018-10-31 | 2019-01-22 | 中国石油天然气股份有限公司 | A kind of the mercury isotope test method and its device of crude oil |
| CN109253996B (en) * | 2018-10-31 | 2021-05-28 | 中国石油天然气股份有限公司 | Mercury isotope testing method and device for crude oil |
| CN109253994B (en) * | 2018-10-31 | 2021-05-28 | 中国石油天然气股份有限公司 | Oil and gas source mercury isotope detection method and device |
| US11119085B2 (en) | 2018-10-31 | 2021-09-14 | Petrochina Company Limited | Methods and devices for detecting mercury isotopes in oil-gas sources |
| CN111721599A (en) * | 2020-06-23 | 2020-09-29 | 南京大学 | Atomic-level material beam variable-temperature liquid coating collection method and device in vacuum |
| CN111721599B (en) * | 2020-06-23 | 2021-08-27 | 南京大学 | Atomic-level material beam variable-temperature liquid coating collection method and device in vacuum |
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Application publication date: 20140219 |