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Method and apparatus for removing dust and gas pollutants from waste gases, particularly waste gases produced in the manufacture of optical waveguide preforms

  • US 4,765,805 A
  • Filed: 01/29/1987
  • Issued: 08/23/1988
  • Est. Priority Date: 02/05/1986
  • Status: Expired due to Fees
First Claim
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1. Method for purifying waste gases containing pollutants in dust, gas, and/or vapor form wherein in a first step, dust is extracted, and wherein in one or more further steps, the gaseous pollutants are absorbed from the dust-free waste gas by means of an absorption liquid flowing in an absorption-liquid circulation system,characterized in that a dry, coated fabric filter is used for the dust extraction, that the pollutant concentration of the absorption liquid is measured continuously, that, when a predeterminable maximum permissible pollutant concentration is reached, part of the absorption liquid is withdrawn from the absorption-liquid circulation system and is subjected to a chemical detoxication treatment in a separate detoxication circulation system and is then introduced into a sewage system, and that in the absorption-liquid circulation system, the withdrawn part of the absorption liquid is replaced by fresh, unpolluted absorption liquid.

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