Objective
Descriptions of the individual parts of the project are given below.
Removal of trace elements in hot gas cleaning systems (CSIC)
Study of the capture of trace elements by a range of different sorbents - mainly metal mixed oxides, clay materials and alkaline-earth carbonates but also some alumina and siliceous materials - in two laboratory scale reactors (a fixed bed and a fluidised bed) at temperatures between 550 and 750 degC. Different compositions of the simulated coal gas stream will also be tested.
Different sorbents, temperatures and stream gas composition will be studied during each of three periods of six months in each of the three years of the programme.
Hot H2S Removal by using waste products as solvents (TGI)
Testing of red mud (a residue from aluminium manufacture) and electric arc furnace dust (a residue from steel making) as sorbents for hot dry desulphurisation of coat derived fuel gas. These materials have been chosen as containing potential sorbents including calcium, iron, zinc and manganese oxides. Tests will be carried out in a laboratory-scale pressurised reactor.
Use of carbon materials and membranes for hot gas clean up (DMT)
Study of the potential use of carbon materials for removing trace metals and sulphur compounds from hot gasification gases (also potentially the separation of light gases such as hydrogen), taking advantage of the stability of carbon at high temperature and in corrosive atmospheres.
A bed of carbon (or, where appropriate, another material) alone or in combination with a carbon filtering membrane installed in a laboratory gas circuit will be used:
- to study the effect on composition of passing gas from a gasifier through a bed of activated carbon or a carbon molecular sieve at various temperatures, pressures and flow rates.
- to repeat the studies as above with a filtering membrane made from carbon added.
- to study the combination of sorption/filtration and catalytically active materials (i.e. using catalysts for the CO shift and for hydrogenation)
The use of other compounds such as zeolitic membranes or granular beds will also be considered and the advantages of using combined gas clean up systems will be reviewed in the light of the data obtained.
Development of improved stable catalysts and trace elements capture for hot gas cleaning in advanced power generation (CRE Group)
Studies will be carried out on existing equipment to improve and assess catalysts based on iron oxide on silica and titania with mixed metal oxides to remove ammonia, hydrogen cyanide, hydrogen chloride, arsine, hydrogen sulphide and carbonyl sulphide. Selected catalysts will be tested at pressures up to 20 bar and temperatures in the range 500 - 800 degC using simulated atmospheres. Long term operation (over I000 h) will be studied.
Novel sorbents for trace elements will be sought by a systematic study of the reactions between these trace elements and potential sorbents. Advanced techniques will be used to detect and quantify trace elements. In a second step, low temperature plasma de-ashing will be used in order to determine trace element concentrations in sample coals.
Performance requirements from hot gas cleaning systems in advanced combined cycle plants (CTDD (BCC))
Specification of the contamination limits to be achieved in a hot gas cleaning system to give an acceptable service life for the gas turbine or other hot gas path component. The following programme will be carried out:
- Assessment of the amount of contaminants likely to be present in coal-derived hot-gas cleaned gases using available information and theoretical models.
- Experimental study on laboratory and burner test rigs of the deposition on and corrosion of static turbine blade surfaces by gases with different contaminant levels. A limited number of tests up to about 4,000 h duration will be carried out.(part of these tests will be carried out at Cranfield University).
- Target levels of contaminants to give what is considered a reasonable component life will then be estimated using mathematical models.
Separation of pollutants before the gas turbine by hot filter dust (Rheinbraun)
Experimental investigation of the capture of halogens, alkalis and other pollutants, including heavy metals, by adsorbing these on the hot dry dust collected in a hot gas filter. Measurements will be made on a large demonstration filter (gas flow up to 53 000 cubic metres (STP) at 10 bar and 260 - 270 degC attached to the High Temperature Winkler demonstration plant.
Construction and operation of a pilot plant for the removal of H2S from real coal gas (Haldor Topsoe)
Design, construction and testing of a pilot plant in the gas stream from an existing gasifier in Finland. The pilot plant will contain 5 reactors: one as a halogen guard or for shift catalysts (or both), two using tin oxide as sorbent and two using zinc oxide as sorbent The gas flow of 500 to 1 000 Nm3/h to be used is adequate to enable scale up to industrial reactors. It is envisaged that the main part of the sulphur will be removed by the tin sorbent while the zinc sorbent will remove the remainder down to a few ppm (depending on water content).
Call for proposal
Data not availableFunding Scheme
CSC - Cost-sharing contractsCoordinator
45307 Essen
Germany