Process for reducing the carbon dioxide content of waste gases from a gas-turbine or vapour-turbine power plant and power plant using it

摘要

In plants with fossil combustion, carbon dioxide and, if appropriate, water are ultimately formed as a combustion product. These two products are as a rule released as waste gases into the atmosphere. The carbon dioxide produced then impedes the heat emission from our Earth and causes the so-called greenhouse effect. The invention is based on the object of largely suppressing the release of carbon dioxide from a gas-and-steam power plant into the atmosphere. In a gas-and-steam turbine power plant with a gasifier (18, 238) upstream of the combustion chamber (14, 234), it is provided according to the invention that the raw gas (RG) from the gasifier (18, 238) is dedusted, cooled, purified and enriched with water and shift-converted. The carbon dioxide (CO2) and, if appropriate, the sulphur compounds are separated off by a scrubbing agent. The carbon dioxide is disposed of, for example passed into a dry ice plant (66, 290) or otherwise industrially utilised. The pure gas (GG) largely free of carbon dioxide and containing essentially hydrogen is fed as fuel to the combustion chamber (14, 234) of the gas turbine. The invention is applicable especially to gas-and-steam turbine power plants, but can also be used in pure gas turbine power plants. IMAGE