Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/019—Post-treatment of gases
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/22—Devices for withdrawing samples in the gaseous state
  • G01N1/2247—Sampling from a flowing stream of gas
  • G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/0004—Gaseous mixtures, e.g. polluted air
  • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
  • G01N33/0011—Sample conditioning
  • G01N33/0014—Sample conditioning by eliminating a gas
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/0004—Gaseous mixtures, e.g. polluted air
  • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
  • G01N33/0011—Sample conditioning
  • G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/22—Devices for withdrawing samples in the gaseous state
  • G01N1/2247—Sampling from a flowing stream of gas
  • G01N2001/227—Sampling from a flowing stream of gas separating gas from solid, e.g. filter
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/22—Devices for withdrawing samples in the gaseous state
  • G01N2001/2282—Devices for withdrawing samples in the gaseous state with cooling means

Definitions

• the invention relates to a device for sampling for gas analysis of gases heavily loaded with impurities, in particular with solids and tar, according to the preamble of claim 1 and a method for gas analysis of these gases
• the raw coke oven gas produced from coking coal is a brown-yellow mixture of gases and vapors. It mainly consists of hydrogen, methane, unsaturated hydrocarbons, carbon oxide, carbon dioxide, nitrogen, ammonia, sulfur and hydrogen sulfide as well as tar.
• the raw coke oven gas In order to use the raw coke oven gas as heating gas in steelworks or power plants or to feed it into a gas network, it has to be cleaned in a special raw gas treatment plant.
• the steam-saturated coke oven raw gas coming from the coke ovens which is approx. 80 ° C hot, is first indirectly cooled and electrostatically de-aerated before it is largely freed from hydrogen sulfide, ammonia, benzene and naphthalene. Due to the high proportion of particulate and tarry constituents in the raw coke oven gas, it is not possible to continuously sample the coke oven raw gas coming from the coke ovens, which is saturated with steam at approx. 80 ° C, in order to carry out gas analyzes in online operation.
• the continuous sampling of the raw coke oven gas only takes place after indirect gas cooling and electrostatic de-icing in the cold area (approx. 20 ° C).
• the maintenance effort for this sampling is still very high there.
• a continuous oxygen measurement in the raw coke oven gas can therefore only take place at the outlet of the electrostatic filter. Therefore, the time for switching off the electrostatic filter when an explosive mixture is detected in this area must be very short.
• the cut-off point for the electrostatic filter is usually set to a limit oxygen content of less than 2% in the raw coke oven gas. This often leads to unnecessary downtimes in the field of coke oven raw gas depletion.
• the invention has for its object to provide an apparatus and method with which continuous sampling and analysis of gases heavily loaded with contaminants, such as solids and tar, is reliably possible with little maintenance.
• the response time for switching off electrostatic discharge systems for raw coke oven gas should be extended.
• Another task is to provide a method for gas analysis of these gases.
• the sample gas to be analyzed is kept in a sampling line and in an electrostatic filter at the temperature at which the sampling takes place.
• this temperature is approx. 80 ° C for raw coke oven gas.
• the sampling line and the electrostatic filter must be largely protected against condensation, e.g. B. by insulation, so that water and tar can not condense appreciably, which would lead to caking in the sampling line and the electrostatic filter. Preference is given to heating the sampling line and the electrostatic filter to a temperature which corresponds to the temperature of the sample gas during sampling.
• the electrostatic precipitator has a significantly higher efficiency at a temperature of approx. 80 ° C than at lower temperatures. 99.99% of the solids are separated in the heated electrostatic precipitator.
• the sample gas is then - preferably - passed through a heated cotton filter. In this cotton filter any entrained particles are separated due to the reduction in flow velocity and the filter effect of the cotton.
• the sample gas then flows into a heated gas saturator.
• the gas saturator is mixed with an organic solvent, e.g. B. decalin filled.
• the sample gas is saturated with the solvent according to the saturation vapor pressure.
• the sample gas is now fed into an indirect cooler in which the water vapor and the naphthalene contained in the sample gas are condensed out.
• the naphthalene does not clog the cooler because it is dissolved and washed off by the solvent taken up in the saturator, which also condenses in the cooler.
• the naphthalene can also be separated with a wash bottle filled with solvent.
• the sample gas cleaned in this way can now be conveyed continuously by means of the gas pump to the desired online analysis and to the oxygen measurement connected in parallel.
• a solvent trap is provided in front of the gas saturator, which separates entrained solvent in the event of fluctuations in pressure.
• the sampling system according to the invention is protected against explosion by a locking chain.
• PSA switch Pressure Switch Alarm
• the locking chain also closes automatically if an oxygen content of> 4% is measured during the oxygen measurement.
• an alarm message (signal lamp and horn) and a switch-off signal can be sent from the sampling device to the technical facilities, such as the electrostatic emptying of a coking plant.
• the sample gas After passing through the oneline analysis devices, the sample gas can be returned to the sample gas line.
• the sampling device can be arranged in a transport case.
• the transport case can be heated so that separate heating of the electrostatic precipitator and the gas saturator is not necessary.
• sampling device With the sampling device according to the invention, continuous sampling is possible with all gases containing a lot of dust, such as e.g. waste incineration, gasification, heavy oil firing, coal firing systems and blast furnace gases.
• gases containing a lot of dust such as e.g. waste incineration, gasification, heavy oil firing, coal firing systems and blast furnace gases.
• test gas is under pressure, a gas pump may not be necessary.
• Figure. 1 shows a schematic illustration of the sampling device
• Figure 2 shows an electrostatic filter with integrated solids determination.
• a heated sampling line 2 is branched off in front of a coke oven raw gas line 1 of a coking plant, not shown, which is connected to a heated electrostatic filter 3 for separating the aerosol-like contaminants of the raw gas.
• the electrostatic filter 3 is operated with a high-voltage generator 4.
• the electrostatic filter 3 is provided with a continuous drain 3 '.
• a cotton filter 5, which is also heatable, is arranged behind the electrostatic filter 3.
• the sample gas then flows through a gas saturator 6 with decalin 6a, which is preceded by a solvent trap 6 '.
• the sample gas saturated with decalin 6a flows into a cooler 7, in which the condensation takes place.
• the cooler 7 is provided with a continuous drain T.
• the sample gas processed in this way can be fed to a continuous oxygen measurement 10 via a gas pump 8. Further online gas measuring devices 9 are connected via a further line.
• the electrostatic filter 11 shows an electrostatic filter 11 with integrated solids determination.
• the electrostatic filter 11 consists of a cylindrical jacket 12, which serves as a negative pole, and a spray wire 13 with an insulator 13M.
• the cylindrical jacket 12 has a cover 14.
• a cone 15 with an outlet 17 is arranged, which can be closed by a shut-off valve 16.
• the sample gas enters through a gas inlet nozzle 18 which is open in the direction 'of the cone 15 °.
• the cone 15 of the electrostatic precipitator 11, which acts as a diffuser, results in a reduction in the flow velocity, as a result of which rough particles are already pre-separated in the sample gas.
• the sample gas leaves the electrostatic precipitator 11 via a gas outlet connection 19 which is arranged at the upper end of the cylindrical jacket 12 of the electrostatic precipitator 11.
• a collecting container 20 is arranged under the cone 15 of the electrostatic filter 11.
• the collecting container 20 receives the substances separated in the electrostatic filter 11 via an outlet 17.
• the collecting container 20 can be emptied via an emptying 22 with a shut-off valve 21 onto a sieve plate 24 with a balance 25.
• the emptying takes place under nitrogen, which is fed into the collecting container 20 through a nitrogen supply 23. Since 99.99% of the solids carried with the sample gas are separated in the electrostatic filter 11, there is thus the possibility of continuously determining the solids content of the sample gas by weighing.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Analytical Chemistry (AREA)
• Physics & Mathematics (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Food Science & Technology (AREA)
• Medicinal Chemistry (AREA)
• Combustion & Propulsion (AREA)
• Biomedical Technology (AREA)
• Molecular Biology (AREA)
• Sampling And Sample Adjustment (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=7634120

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• 2000
  • 2000-03-13 DE DE10011531A patent/DE10011531A1/de not_active Ceased
• 2001
  • 2001-03-09 KR KR1020027010493A patent/KR20020088071A/ko not_active Application Discontinuation
  • 2001-03-09 AU AU2001244200A patent/AU2001244200A1/en not_active Abandoned
  • 2001-03-09 EP EP01917082A patent/EP1264175A2/de not_active Withdrawn
  • 2001-03-09 JP JP2001568064A patent/JP2003527602A/ja active Pending
  • 2001-03-09 WO PCT/EP2001/002667 patent/WO2001069233A2/de active Application Filing
• 2002
  • 2002-08-02 ZA ZA200206180A patent/ZA200206180B/en unknown

Non-Patent Citations (1)

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