CN108020601A - A kind of device and method for being used to measure coal pyrolysis gas simple substance mercury content - Google Patents
A kind of device and method for being used to measure coal pyrolysis gas simple substance mercury content Download PDFInfo
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- CN108020601A CN108020601A CN201711235842.5A CN201711235842A CN108020601A CN 108020601 A CN108020601 A CN 108020601A CN 201711235842 A CN201711235842 A CN 201711235842A CN 108020601 A CN108020601 A CN 108020601A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
Abstract
The invention belongs to gas Elemental Mercury detection technique field, and in particular to pyrolysis of coal utilize during in pyrolysis gas mercury measurement.The coal pyrolysis gas simple substance mercury content device that is used to measure of the present invention includes mercury vapour generating means, adsorbent, ADSORPTION IN A FIXED BED reaction member, absorptive unit.Mercury vapour generating means includes Standard Gases generating means, mercury osmos tube, filter, flowmeter, flow control case, temperature control unit, infiltration room.Common service is in mercury measurement device between device unit, and level is simple, simple operation, cost are low；Data measurement accuracy and precision are high.
Description
Technical field
The invention belongs to gas Elemental Mercury detection technique field, and in particular to mercury in pyrolysis gas during pyrolysis of coal utilizes
Measurement.
Background technology
The e measurement technology of stationary source-mercury emissions, both at home and abroad at present also among further development and improving.For
The measuring method of mercury emissions, researchers have done numerous studies, it is proposed that following methods：（1）On-line analysis method,（2）Take offline
Sample analytic approach.
The on-line analysis method of Hg（Hg-ContinuousEmissionsMonitor, CEM）It is based primarily upon following four major classes skill
Art is set up：Cold Atomic Fluorescent Mercury spectrum, Clod Vapour Atomic Absorption spectrum, atomic radiations spectrum and chemical microsensor, suitable for inciting somebody to action
Instrument is installed on the situation that fixed position is monitored on-line.CEM is that sampling eliminates potential interference gas from flue gas（Such as three oxygen
Change the sour gas such as sulphur, sulfur dioxide, hydrogen chloride）Afterwards, the content of Hg is measured by sensing chamber, online gas mercury e measurement technology is
A kind of very effective measuring method of mercury emissions research field, and it is widely used in the commercial Application of mercury emissions monitoring
In, the content of Hg in flue gas can be monitored on-line in real time.
At present, more mature Hg-CEM devices have the Tekran3300 that Canada produces；The DuragHM- of U.S.'s production
1400TR；The OhioLumexRA-915+ of Russia's production；DM-6A/MS-1A of Japan's production etc..On-line analysis is at present still
There is shortcoming, although it can detect Hg contents in flue gas in real time, research shows the knot that the length of probe tube measures Hg
Fruit influence is very big, because gaseous state Hg especially Hg2+ have the trend condensed on tube wall, so that mercury measurement result is lower than actual.
The some other gases such as sulfur dioxide contained in flue gas, also can have absworption peak, so as to cause to mercury in the characteristic wave strong point of Hg
Test result interference：For the gaseous state Hg in flue gas, when using CEM, the distributional pattern of Hg may be attracted to filtering
Ash particle on device changes；In addition, the instrument price that on-line analysis method uses is higher, complexity is safeguarded, and flue gas to be measured is wanted
Ask higher, still have a distance from commercial applications.
Offline sampling and analyzing method can be divided into solid absorbent sampling analysis method according to the form of absorbent and wet-chemical is inhaled
Receipts method, offline sampling monitoring is carried out suitable for carrying instrumentation to different power plant.Wet-chemical absorption process mainly includes
OntarioHydro methods（Ontario method OHM）、EPAMethod2、EPAMethod101A.OHM methods are applied than wide recently,
Its feature is Hg concentration, the Hg forms that can measure any flue position, it is considered to be in collection and analysis coal-fired flue-gas
The standard method of mercury species.However, Ontario method OHM sampling and testings are there may be pollution, and it is cumbersome, while take
With height, and easily introduce human error, such as Chemical Pretreatment, field sampling, Specimen eliminating, sample analysis, analysis calculate, bottle
Son does not wash clean clearly, this requires operating personnel also very high therefore big to the progress of China's coal fired power plant using Ontario method OHM
Also there are larger difficulty for the Hg emission tests of scale.
The content of the invention
The present invention is directed to the deficiencies in the prior art, there is provided a kind of dress for being used to measure coal pyrolysis gas simple substance mercury content
Put.
Device for measuring coal pyrolysis gas simple substance mercury content includes mercury vapour generating means, adsorbent, ADSORPTION IN A FIXED BED
Reaction member, absorptive unit；
The mercury vapour generating means includes Standard Gases generating means, mercury osmos tube, filter, flowmeter, flow control case, perseverance
Warm control unit, infiltration room；It is air or nitrogen that Standard Gases generating means, which produces gas, and air-flow divides two-way, makees carrier gas stream all the way,
Flow is 80mL/min, carries mercury vapour after filter, flowmeter, mercury osmos tube successively, and another way makees carrier gas, and flow is
50-80mL/min, is single air or nitrogen without mercury osmos tube, and adjusting flow by flow control case reaches dilution carrier gas stream
Effect；Mercury osmos tube is the core component of mercury vapour generating means, and mercury permeability meets 177 ± 5ng/min, positioned at filtering
Infiltration after device, flowmeter, flow control case is indoor, by temperature control unit temperature control at 25.0 DEG C ~ 110.0 DEG C, preferably 70 ~
79.9 DEG C, temperature-controlled precision is 0.1 DEG C；
Fixed adsorption reaction unit is made of adsorption tube, adsorbent, silica wool, activated carbon, electric furnace；Adsorption tube is quartz material,
Absorption bore is 6mm ~ 10mm；Outside diameter is 10 ~ 15mm；Both ends are blocked with silica wool, sealed, the absorption of adsorption tube central filler
Agent, adsorption tube divide adsorption section, penetrate section, pre-add bid section；
Adsorbent is modified cocoanut active charcoal；The modified cocoanut active charcoal is modified using halogen compounds, modifier
For HCl, KI, NaBr, CaBr2、CuCl2、I2One or several kinds；Adsorbent is located at the flat-temperature zone of electric furnace；Modified cocoanut active charcoal
It is that cocoanut active charcoal is soaked through halide solution, after rotating speed is when concussion 24 is small under 150 revs/min of shaking table, at 80 DEG C
Dried in constant temperature oven, it is broken to be granulated into less than 100 mesh and obtain.
Absorptive unit is equipped with H by two2SO4And KMnO4Mixed solution, liquid level be 50mm absorption bottle series connection and
Into tail gas is discharged into fume hood.
Method for measuring coal pyrolysis gas simple substance mercury content belongs to the method that off-line analysis surveys mercury, and step is：
（1）Mercury vapour generating means calibration early period；Mercury osmos tube is put into, turns off valve and opens valve towards activated carbon in the lump
Two；Electric power starting mercury vapour generating means is opened, temperature is set as 30 DEG C, dilution air flow is adjusted to 80mL/min, carrier gas stream
It is adjusted to 80mL/min；Valve two is closed after 1h and opens valve one；Valve one is closed after 20-40min, opens valve two；Tail gas
Cleared up through absorptive unit, then measure H with QM201 atomic fluorescences mercury vapourmeter2SO4And KMnO4Mixed solution in mercury it is dense
Degree, the quality of mercury in absorptive unit is finally calculated according to the volume of solution, is asked with the total mercury divided by soak time of absorption
Obtain infiltration rate of the mercury under the experiment condition, it is ensured that meet the requirement of 177 ± 5ng/min of mercury permeability；
（2）Measure coal pyrolysis gas simple substance mercury content；Coal pyrolysis gas to be measured into before device must the first KCl solution through 1mol/L, inhaling
After getter state bivalent mercury, device of being allowed for access；Specially：Coal pyrolysis gas is passed through equipped with Klorvess Liquid after silica wool is filtered
Absorption bottle in, selective absorption bivalent mercury, and gaseous state nonvalent mercury then enter measurement coal pyrolysis gas simple substance mercury content device,
Into solid absorption reaction member；Adsorbed by the adsorption tube equipped with adsorbent, three sections of adsorption tube point, has ensured adsorbent loading
And adsorption efficiency, absorption completely after, take out adsorption tube and laboratory using EPA747 methods measure silica wool in and adsorption tube
The mercury content of middle adsorbent, so as to achieve the purpose that to measure mercury content.
Wherein, Standard Gases generating means has air feed pump, can constant basis occur nitrogen or air, gas generation rate can
Adjust scope be：0.2-200mg/h, generation concentration precision ± 15%；The osmos tube is heated by temperature control unit, and temperature can
At 25.0 DEG C ~ 110.0 DEG C, preferably 70.0 DEG C of reaction absorption, temperature-controlled precision is 0.1 DEG C for control.
The device for being used to measure coal pyrolysis gas simple substance mercury content of the present invention must do calibration early period before use, be specifically pair
Mercury vapour generating means lower mercury at 30 DEG C oozes rate self-calibration, and step is as follows：
（1）Mercury osmos tube is put into, the valve turned off towards adsorbent bed opens the valve two towards activated carbon in the lump；
（2）Electric power starting mercury vapour generating means is opened, temperature is then adjusted to 30 degrees Celsius, diluted air-flow is adjusted to
80mL/min, the carrier gas stream for flowing into infiltration room are adjusted to 80mL/min；
（3）Opened it valve one after one hour, and closes valve two, and adsorbent starts to absorb the generation of mercury generating means at this time
Mercury vapour, time 20min；
（4）Valve one is closed after to be absorbed, opens valve two；
（5）With the H described in the method for Ontario2SO4-KMnO4Digestion procedure clears up absorbing liquid, then tests in digestion solution
Mercury concentration（Measured with QM201 atomic fluorescences mercury vapourmeter）The quality of mercury in absorbing liquid is finally calculated according to the volume of solution.
Infiltration rate of the mercury under the experiment condition can be tried to achieve directly with the total mercury divided by soak time of absorption.
The invention belongs to the method that off-line analysis surveys mercury, and on the basis of mercury method is surveyed in existing dry absorption, designed, designed is simultaneously
Set of device is established, to ensure the authenticity of the sensitivity of device and data determination, coal pyrolysis gas to be measured is first into palpus before device
KCl solution through 1mol/L, after gaseous state bivalent mercury is absorbed, the dress of the present invention that is allowed for access measurement coal pyrolysis gas simple substance mercury content
Put.Specially：Pyrolysis gas being passed through through silica wool filtering ensures the stabilization of sampling unit in the absorption bottle equipped with Klorvess Liquid
Property, and selective absorption bivalent mercury.And gaseous state nonvalent mercury then enters absorption bottle and is fitted with the adsorption tube absorption of adsorbent.
Three sections of adsorption tube point, it is ensured that larger acticarbon loading, the measuring accuracy and absorption that adsorption tube has been effectively ensured are imitated
Rate.The method is easy to operate, again can be with the mercury shape in detection gas on the basis of measurement accuracy is ensured.After to be sampled,
Take out adsorption tube and the mercury content in laboratory is using EPA747 methods measure silica wool with activated carbon in adsorption tube.
Apparatus of the present invention are simple in structure, easy to operate, cost is low；Data measurement accuracy and precision are high.
Brief description of the drawings
Fig. 1 is mercury vapour generating means principle schematic, and label meaning is respectively 1 in Fig. 1：Carrier gas stream；2：Filter；
3：Flowmeter one；4：Flow control case；5：Mercury osmos tube；6：Mercury vapour；7：Temperature control unit；8：Flowmeter two.
Fig. 2 is adsorption tube schematic diagram.
Fig. 3 is the schematic device for measuring coal pyrolysis gas Elemental Mercury, and label meaning is respectively 1 in Fig. 3：Mercury vapour
Generating means；2：Valve one；3：Activated carbon；4：Adsorption tube；5：Adsorbent；6：Electric furnace；7：Temperature control system；8：Absorbing liquid；
9：Valve two.
Embodiment
Apparatus of the present invention include mercury vapour generating means, adsorbent, ADSORPTION IN A FIXED BED reaction member, absorptive unit.
As shown in Figure 1：Mercury vapour generating means is by Standard Gases generating means, mercury osmos tube, filter, flowmeter, stream
Measure control cabinet, temperature control unit composition；Standard Gases generating means gas divides two-way, and mercury vapour is carried after mercury osmos tube, stream
It is carrier gas to measure as 80mL/min, another way, is nitrogen, flow 60mL/min,；Mercury permeates pipe range 4.2cm, and permeability is
177 ± 5ng/min, mercury osmos tube is located at the infiltration interior after filter, flowmeter, flow control case, by thermostatic control list
First temperature control；
Fixed adsorption reaction unit includes quartz ampoule, adsorption tube, quartz holder, silica wool and electric furnace；Quartzy pipe outside diameter 10mm, it is interior
Footpath 8mm, both ends are blocked with silica wool, sealed, and ensure air-tightness, reaction tube central filler adsorbent.
As shown in Figure 2：Three sections of adsorption tube point, first segment are adsorption section, and for second segment to penetrate section, the 3rd section is pre- mark-on
Section；Adsorption tube is quartz ampoule material, and internal diameter is 6mm ~ 10mm；Outside diameter is 10 ~ 15mm；Filling activated carbon in adsorption tube.Adsorbent
It is modified cocoanut active charcoal；Modified cocoanut active charcoal is modified using halogen compounds；Adsorbent is located at the constant temperature of electric furnace
Area.
Adsorption tube can reach the measuring accuracy and adsorption efficiency of requirement, there is filling length and the filling of larger adsorbent
Amount.The method is easy to operate, again can be with the mercury shape in detection gas on the basis of measurement accuracy is ensured.After to be sampled,
Take out adsorption tube and the mercury content in laboratory is using EPA74 methods measure silica wool with activated carbon in adsorption tube.Adsorption tube
For two kinds：Mark-on adsorption tube, common adsorption tube.Two kinds of adsorption tubes difference lies in activated carbon difference, mark-on adsorption tube be
In first segment activated carbon plus the mercury of known quantity carries out mark-on experiment, and common adsorption tube is then filling mercury-free activated carbon to carry out
The test of total mercury.
To improve the Hg adsorption efficiencies and adsorption capacity of adsorbent, HCl, KI, NaBr, CaBr are passed through to activated carbon2,
CuCl2, I2It is modified processing.By HCl, KI, NaBr, CaBr2, CuCl2Tie in gap Deng the modified activated carbon of halogen thing
Structure and surface functional group can change, and strengthen strainability, available for the side such as solvent recovery, air purification and environment protection treating
Face.
Adsorbent is modified using halogen compounds, and adsorbent selects cocoanut active charcoal, activated carbon（It is conventional+modified）Ginseng
Number is as shown in table 2.The modifier used has HCl, KI, NaBr, CaBr2、CuCl2、I2, modification processing method is as follows：Weigh corresponding
Quality halide, 10% is dissolved in by 20g activated carbons and halide（200 milliliters）In solution, in shaking table（150 revs/min）Place 24
After hour, dried in 80 DEG C of constant temperature oven.Table 1 is parameter after modified cocoanut active charcoal, and C1 is conventional cocoanut active charcoal, C2
For modified cocoanut active charcoal.
Table 1 is modified cocoanut active charcoal parameter
| Numbering | C1 | C2 |
| Particle diameter (mesh) | 16-30(0.6-0.9mm) | 8-16 |
| Moisture content (%) | ≤5 | ≤4 |
| Ash (%) | ≤5 | ≤4 |
| Bulk density (g/mL) | 0.32 | 0.25 |
As shown in Figure 3：Fixed adsorption reaction unit is made of quartz ampoule, adsorption tube, silica wool, electric furnace, activated carbon；Quartz ampoule
Outside diameter 10mm, internal diameter 8mm, both ends are blocked with silica wool, sealed, reaction tube central filler adsorbent；Absorptive unit is by two dresses
There is H2SO4And KMnO4Mixed solution, liquid level be 50mm absorption bottle be in series, tail gas is discharged into fume hood.
The device for being used to measure coal pyrolysis gas simple substance mercury content of the present invention must do calibration early period before use, be specifically pair
Mercury vapour generating means lower mercury at 30 DEG C oozes rate self-calibration, and step is as follows：
（1）Mercury osmos tube is put into, turns off valve and opens valve two in the lump；
（2）Electric power starting mercury vapour generating means is opened, temperature is then adjusted to 30 degrees Celsius, diluted air-flow is adjusted to
80mL/min, the carrier gas stream for flowing into infiltration room are adjusted to 80mL/min；
（3）Opened it valve one after one hour, and closes valve two, and adsorbent starts to absorb the generation of mercury generating means at this time
Mercury vapour, time 20min；
（4）Valve one is closed after to be absorbed, opens valve two；
（5）With the H described in the method for Ontario2SO4-KMnO4Digestion procedure clears up absorbing liquid, then tests in digestion solution
Mercury concentration（Measured with QM201 atomic fluorescences mercury vapourmeter）The quality of mercury in absorbing liquid is finally calculated according to the volume of solution.
Infiltration rate of the mercury under the experiment condition can be tried to achieve directly with the total mercury divided by soak time of absorption.
Table 2 is mercury vapour generating means calibration result.
| Numbering | Infiltration rate（ng/min） | Absolute deviation（ng/min） | Relative deviation（%） |
| 1 | 16.08 | 0.43 | 2.75 |
| 2 | 15.23 | -0.42 | -2.68 |
| 3 | 16.39 | 0.74 | 4.73 |
| 4 | 14.94 | -0.71 | -4.54 |
| Average value | 15.65 | ||
| RSD% | 4.38 |
Mercury vapour generating means is demarcated 4 times, the results are shown in Table 1, relative standard deviation RSD is 4.38%, it is seen that it is at 30 DEG C
Mercury infiltration rate is stable.
During experiment, it is ensured that adsorbent is located at the flat-temperature zone of electric furnace.Absorptive unit is equipped with 50mLH by two2SO4-KMnO4It is molten
Liquid, the absorption bottle that liquid level is 50mm are in series, and experiment tail gas is discharged into fume hood.Experiments verify that the absorptive unit pair
The absorption efficiency of total mercury can reach 99%.
In experiment, certain density mercury, using air as carrier gas, the temperature of mercury osmos tube are produced by mercury vapour generating means
70 DEG C are maintained at, mercury infiltration capacity is 177ng/min, carrier gas flux 60mL/min.
Every kind of adsorbent has carried out under room temperature (25 DEG C) and heating condition (110 DEG C) to mercury vapour adsorption capacity respectively
Test.In the range of being maintained at 95 ± 5 DEG C by electric heater unit and temperature controller gas flow temperature in experiment, used after sampling
Burning absorption process tests each section of adsorbent mercury content.Data show that the time of break-through of modified activated carbon is in laboratory
Under the conditions of more than 5 hours, its be modified adsorption effect is：CuCl2>CaBr2>I2>NaBr>HCl>KI。
The mercury equilibrium analysis of adsorption tube sampling method, in selection characterization of adsorption, pyrolysis characteristics and flying dust of the early period to adsorbent
Sample is collected on the Research foundation of the discrete sampling technology of particle, and mercury shape in gas is analyzed.Table 3
The experimental result that the adsorption trap methods of sampling is recycled in laboratory is given, its mercury rate of recovery is between 97.4-104.4%.
Each adsorption trap methods of sampling restoration result of table 3
| Adsorption trap ID | Hg mark-ons (μ g) | Segment number No. | Hg(μg) | Hg recycles (μ g) | The rate of recovery (%) |
| trap:CuCl2 | 0.1819 | 1 | 0.5112 | 0.1899 | 104.40% |
| 2 | 0.0003 | ||||
| trap:CaBr2 | 0.1868 | 1 | 0.4812 | 0.1881 | 100.70% |
| 2 | 0.0009 | ||||
| trap:NaBr | 0.1877 | 1 | 0.4559 | 0.1879 | 100.11% |
| 2 | 0.0009 | ||||
| trap:HCl | 0.1817 | 1 | 0.4989 | 0.1831 | 100.77% |
| 2 | 0.0003 | ||||
| trap:KI | 0.1899 | 1 | 0.5035 | 0.1856 | 97.74% |
| 2 | 0.0003 | 104.40% |
Sorbent tube method scene pyrolysis bicycle pump sampling and measuring, table 4 give each operating mode in scene and take pyrolysis gas sample using adsorption trap
Experimental result.The method of sampling of the OHM mercury of single use early period is contrasted, the measuring method that the present invention uses is to this four operating modes
The actual sample test results of mercury are substantially consistent with the test result of Ontario method in pyrolysis gas.
The each operating mode adsorption trap result in the scene of table 4
Claims (3)
1. a kind of device and method for being used to measure coal pyrolysis gas simple substance mercury content, it is characterised in that described device is sent out by mercury vapour
Generating apparatus, adsorbent, ADSORPTION IN A FIXED BED reaction member, absorptive unit composition；
The mercury vapour generating means includes Standard Gases generating means, mercury osmos tube, filter, flowmeter, flow control case, perseverance
Warm control unit, infiltration room；It is air or nitrogen that the Standard Gases generating means, which produces gas, and air-flow divides two-way, carries all the way
Air-flow, flow 80mL/min, carries mercury vapour after filter, flowmeter, mercury osmos tube successively, and another way makees carrier gas,
Flow is 50-80mL/min, is single air or nitrogen without mercury osmos tube, and adjusting flow by flow control case reaches dilution
The effect of carrier gas stream；The mercury osmos tube is the core component of mercury vapour generating means, and mercury permeability meets 177 ± 5ng/min,
Infiltration after filter, flowmeter, flow control case is indoor, by temperature control unit temperature control 25.0 DEG C ~ 110.0
DEG C, preferably 70 ~ 79.9 DEG C, temperature-controlled precision is 0.1 DEG C；
The fixed adsorption reaction unit is made of adsorption tube, adsorbent, silica wool, activated carbon, electric furnace；The adsorption tube is stone
English material, absorption bore are 6mm ~ 10mm；Outside diameter is 10 ~ 15mm；Both ends are blocked with silica wool, sealed, and are filled out among adsorption tube
Adsorbent is filled, adsorption tube divides adsorption section, penetrates section, pre-add bid section；
The adsorbent is modified cocoanut active charcoal；The modified cocoanut active charcoal is modified using halogen compounds, is changed
It is HCl, KI, NaBr, CaBr into agent2、CuCl2、I2One or several kinds；The adsorbent is located at the flat-temperature zone of electric furnace；
The absorptive unit is equipped with H by two2SO4And KMnO4Mixed solution, liquid level be 50mm absorption bottle series connection and
Into tail gas is discharged into fume hood.
2. a kind of device and method for being used to measure coal pyrolysis gas simple substance mercury content according to claim 1, its feature exist
Belong to the method for off-line analysis survey mercury in the method, step is：
（1）Mercury vapour generating means calibration early period；Mercury osmos tube is put into, turns off valve and opens valve towards activated carbon in the lump
Two；Electric power starting mercury vapour generating means is opened, temperature is set as 30 DEG C, dilution air flow is adjusted to 80mL/min, carrier gas stream
It is adjusted to 80mL/min；Valve two is closed after 1h and opens valve one；Valve one is closed after 20-40min, opens valve two；Tail gas
Cleared up through absorptive unit, then measure H with QM201 atomic fluorescences mercury vapourmeter2SO4And KMnO4Mixed solution in mercury it is dense
Degree, the quality of mercury in absorptive unit is finally calculated according to the volume of solution, is asked with the total mercury divided by soak time of absorption
Obtain infiltration rate of the mercury under the experiment condition, it is ensured that meet the requirement of 177 ± 5ng/min of mercury permeability；
（2）Measure coal pyrolysis gas simple substance mercury content；Coal pyrolysis gas to be measured into measurement coal pyrolysis gas simple substance mercury content device before palpus
The first KCl solution through 1mol/L, after gaseous state bivalent mercury is absorbed, is allowed for access；Specially：Coal pyrolysis gas is filtered through silica wool
Afterwards, it is passed through in the absorption bottle equipped with Klorvess Liquid, selective absorption bivalent mercury, and gaseous state nonvalent mercury then enters measurement coal heat
Vent one's spleen the device of simple substance mercury content, into solid absorption reaction member；Adsorbed by the adsorption tube equipped with adsorbent, adsorption tube point three
Section, absorption completely after, take out adsorption tube and laboratory using EPA747 methods measure silica wool in and adsorption tube in adsorbent
Mercury content so that achieve the purpose that measure mercury content.
A kind of 3. device for being used to measure coal pyrolysis gas simple substance mercury content according to claim 1, it is characterised in that：It is described
Modified cocoanut active charcoal is that cocoanut active charcoal is soaked through halide solution, is that concussion 24 is small under 150 revs/min of shaking table in rotating speed
Shi Hou, is dried in 80 DEG C of constant temperature oven, broken to be granulated into less than 100 mesh and obtain.
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| US10816532B2 (en) | 2018-10-31 | 2020-10-27 | Petrochina Company Limited | Methods and devices for detecting mercury isotopes in crude oil |
| US11119084B2 (en) | 2018-10-31 | 2021-09-14 | Petrochina Company Limited | Methods and devices for detecting mercury isotopes in natural gas |
| US11119085B2 (en) | 2018-10-31 | 2021-09-14 | Petrochina Company Limited | Methods and devices for detecting mercury isotopes in oil-gas sources |
| CN113155812A (en) * | 2021-03-13 | 2021-07-23 | 竑迈环境科技(上海)有限公司 | Mercury detection and analysis device |
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Application publication date: 20180511 |