Objective
To acquire the performance and operability data to enable commercial slagging gasifiers to be designed and operated to meet predicted engineering and performance guarantees.L%
The British Gas Slagging Gasifier programme was initially drawn up with the objective of meeting British Gas future requirements for coal based substitute natural gas (SNG). Although there is some uncertainly over eventual economic production from coal, and since coal gasification may find much earlier application for the production of synthesis gas, or fuel gas which can be used in combined cycle power generation plants, British Gas has kept development flexible enough to respond to these wider interests.
The specific objectives of the project aim:
- to obtain product yield and performance data on a range of selected coals
- to study the influence on performance of feedstocks and operating design variables
- to establish the effect of scale-up
- to demonstrate that the slagging gasifier can be operated on bituminous coals containing a high proportion of fines (+/- 50%)
- to demonstrate the longterm operability and performance of the gasifier
Work will be carried out at the Westfield Development Centre, an 18 hectare site orginally commissioned as a Lurgi coal gasification plant to supply town gas at 17. 7 MJ/m3 (475Btu/ft3). Of the orginal 4 Lurgi gasifiers (one was converted to the slagging mode in 1974 and used for the Phase II programme), 3 have been removed and a 2. 4m. dia. commercial sized slagging gasifier installed under the Phase IIIa programme.
The programme is in 4 Phases, of which modifications to gasifier and ancilliaries (Phase IIIb) and conclusion of trials under the revised configuration (Phase IIIc) are both covered by this contract.
- coal handling capacity 30t/h max. into gasifier slag handling capacity 11,500 Kg/h
- gas cooling capacity 44 m3 (st)/h
During Phase IIIC, a series of runs will be carried out with 3 different types of bituminous coal, ranging from non-caking to the most strongly caking and swelling coals. The gasification of coal fines will be investigated with these coal types, broadly as follows.
Following satisfactory recommissioning of the plant, the gasifier will be operated using a standard reference coal (Markham) and fines will be added to the top feed. This will establish the performance of the larger plant and scale-up factors.
The need to deal with large proportions of fines will be investigated by operating with blends of graded coal and agglomerated fines in the form of pellets and as briquettes.
A further requirement is to consume the net tar and oil production and the ability to do this will be established by injecting these hydrocarbons into the tuyeres though the gasifier.
Having completed this work on the standard coal a strongly caking and swelling coal (Pittsburgh 8) will be used. This will be followed by tests with fines injection (as a coal/water slurry) at the tuyeres.
Total project cost is estimated at UKL 14,824,000, and is expected to run from March 1985 to May 1987.
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Coordinator
SW6 2AD London
United Kingdom
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