초록 ▼

Pollutant emissions produced during gas turbine power generation with a fuel gas from coal gasification are reduced by initially cooling the fuel gas to a temperature above the dewpoint but between 200°and 400°C. to condense alkalies on dust grains. In the fuel gas, HCl and HF are adsorbed on calciu

Pollutant emissions produced during gas turbine power generation with a fuel gas from coal gasification are reduced by initially cooling the fuel gas to a temperature above the dewpoint but between 200°and 400°C. to condense alkalies on dust grains. In the fuel gas, HCl and HF are adsorbed on calcium carbonate and filtration removes the particulates. The fuel gas is reacted with oxygen in the presence of a carbon containing adsrobent to eliminate sulfur, and the flue gas after combustion is catalytically treated with a carbon containing adsorbent to remove nitrogen and sulfur oxides.

대표청구항 ▼

A process for reducing pollutant emissions produced during hard-coal-based electricity generation in power stations with combaned gas-turbine/steam-turbine operation and in which a fuel gas is produced by coal gasification, said process comprising the steps of: (a) cooling said fuel gas containing h

A process for reducing pollutant emissions produced during hard-coal-based electricity generation in power stations with combaned gas-turbine/steam-turbine operation and in which a fuel gas is produced by coal gasification, said process comprising the steps of: (a) cooling said fuel gas containing hydrogen sulfide, hydrogen chloride, hydrogen fluoride and alkalies in a vapor state and entrained dust grains to a temperature between approximately 200°and 400°C. and above the water-vapor dewpoint of the fuel gas to condense said alkalies on said dust grains and produce a cooled fuel gas; (b) reacting said cooled fuel gas with an adsorbent containing calcium carbonate to chemically bond hydrogen chloride and hydrogen fluoride from said fuel gas to said adsorbent; (c) thereafter filtering said adsorbent from said cooled fuel gas and dedusting same by passing said fuel gas through a filter to cause build up of a filter bed from particles carried by said fuel gas, and effecting a postdehalogenation subsequent to step (b) on the filter bed as said filter bed is built up on said filter; (d) reacting said fuel gas following step (c) with a carbon-containing adsorbent in the presence of oxygen to transform hydrogen sulfide in said fuel gas to elemental sulfur and trap said elemental sulfur in pores of said carbon-containing adsorbent to produce a purified gaseous fuel; (e) burning said purified gaseous fuel in a gas-turbine combustion chamber to which air is supplied to produce a flue gas containing nitrogen oxides and sulfur dioxide; and (f) treating said flue gas with a catalytically active carbon-containing adsorbent to remove said oxides from said flue gas.