Classifications

• • 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
• • 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
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/22—Devices for withdrawing samples in the gaseous state
  • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
• • 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
  • G01N1/24—Suction devices
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
  • G01N1/40—Concentrating samples
• • 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
  • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
  • G01N2001/222—Other features
  • G01N2001/2223—Other features aerosol sampling devices
• • 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
  • G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

• the invention relates to a device in units for measuring gas processing for gas analysis, with a heated gas extraction, a gas cooler with condensate drainage, an aerosol filter, pumps and fine dust filters.
• the gas mixture (sample gas) must be fed to the analyzers free of dust and condensate.
• Filters with Teflon or ceramic inserts with a pore size of approximately 1 ⁇ m are used to separate the aerosol still present in the measuring gas after the gas cooler. If the sample gas contains a high proportion of SO, it is shown in practice that after the gas cooler and the aerosol filter, an aerosol or acid precipitate forms in the gas-carrying parts, which is removed from gas lines, gas pumps, gas flow indicators and the analysis devices at relatively short intervals must be, which creates a significant maintenance.
• the formation of the acid precipitate in the gas lines can be explained as follows: SO ⁇ - and f- ⁇ SO ⁇ .- molecules are contained in the molecular system of a combustion exhaust gas which is approx. 200 ° C
• the result is a disperse system in which the dispersed substance is colloidally divided oleum (concentrated sulfuric acid with sulfur trioxide dissolved in it) in the dispersing agent, the colloidal particles become larger and larger until they finally become visible deposits of oleum on the walls of the gas-carrying parts
• oleum is extremely hygroscopic, it absorbs water vapor from the residual moisture of the gas, so that acidic liquid is formed between a few thousandths of a micron and a few microns.
• the proportion of smallest particles apparently predominates in the combustion exhaust gases, which is why the aerosol filters used with a pore size of 1 ⁇ m are not effective.
• the flow velocity of the gas is reduced to such an extent that it remains in the filter for a sufficiently long time so that the large effective surface area of the inner wall of the vessel and the inert shaped bodies, preferably spheres made of quartz glass, a large part of the aerosols is already separated by coagulation with the formation of acid.
• the measuring gas can flow through the free spaces between the molded bodies unhindered, so that falsified values due to absorption of the gas components to be measured are avoided.
• the coagulation filter can be installed in a thermostated container and there at a temperature between 280 and 300 K. being held.
• the proportion of aerosols that is transported by the gas flow at the filter outlet has the desired property of the acid mist. This acid mist is completely filtered out in the following aerosol pore filter.
• FIG. 1 shows a coagulation filter
• Figure 2 shows a sample gas processing system with the built-in coagulation filter.
• the coagulation filter KF consists of an essentially cylindrical vessel 1, the diameter D of which is a multiple of the diameter of its inlet and outlet lines 4, 5 at the end.
• the cylindrical vessel 1 is filled with inert shaped bodies 2, here quartz glass spheres with diameters between 3 and 10 mm.
• the length L of the vessel 1 is approximately ten times its diameter D.
• the condensate formed in the coagulation filter KF is discharged via the condensate drain 3.
• the gas mixture to be analyzed is removed from the exhaust gas duct by means of the gas extraction GE and fed to the measuring gas processing unit via an extraction line EL.
• the gas extraction GE and the extraction line EL can be heated to a temperature above the acid dew point.
• the gas coolers MK with condensate drains and the condensate pumps KP are preceded by the coagulation filter KF in the flow path of the gas.
• Its installation position is such that the longitudinal axis of the vessel of the coagulation filter encloses an angle of 0 to 45 ', here 0 * , with the horizontal, so that the pre-condensate produced can easily drain off via the condensate breakdown 3.
• the Koagu ⁇ correlation filter KF is the ambient temperature at the installation more than 30 * C, this can in a thermostatically controlled vessel TG at an operating temperature be- see 280 K and 300 K are held.
• the aerosol filters AF which are arranged after the gas coolers MK in the flow path and are designed as pore filters with a pore size in the order of magnitude of I ⁇ , the remaining aerosols are separated off, so that with the help of the membrane pumps MP and the fine dust filter FF, measuring gas with the to Analysis required purity can be supplied to the analyzers I, II and III, each measuring one of the components of the sample gas.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=6864076

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (7)

Citations (5)

• 1991
  • 1991-02-07 DE DE9101410U patent/DE9101410U1/de not_active Expired - Lifetime
• 1992
  • 1992-01-23 WO PCT/DE1992/000039 patent/WO1992014130A1/de not_active Application Discontinuation
  • 1992-01-23 EP EP92903568A patent/EP0524282A1/de not_active Withdrawn

Patent Citations (5)

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