Cel To perform work on the existing 12 t/d pilot plant to extend the range of applications and increase commercial competitiveness of the British Coal gasification process by specifically examining1) alternative process configurations based on utilisation of cyclone fines and;2) demonstrate the process, using oxygen enriched air.L%The 0. 5 tonne/h coal gasification pilot plant has been operated for a total of 2600 hours during four operating periods.The gasifier was operated at slightly above atomospheric pressure and a maximum operating temperature 1020 deg. Extend operation of the gasifier without sinter formation was demonstrated using bauxite as the gasifier bed material. The work has shown that coal conversion efficiencies up to 90 % can be achieve when the elutriated fines caught in the high temperature primary/cyclone were recycled by the gasifier. With air/steam fluidising gases the calorific value of the gas produced was typically 3. 8 MJ/m3. Tests with oxygen enriched fluidising gases have demonstrated that gases with calorific values up to 7. 5 MJ/m3 can be produced. Work with limestone addition has shown that up to 85 % of the sulphur normally released to the fuel can be retained.Operations with in-bed feeding of "smalls" grade coal (-19 mm) and overbed feeding of a range of "singles" grade coals, with ash deformation temperatures as low as 1030 deg, were carried out to demonstrate the fuel flexibility of the process.Two brick firing trials have been completed during the development programme which demonstrated the use of gasifier fines as a brick programme which demonstrated the use of gasifier fines as a brick additive. The use of carbonaceous fines in the bricks was shown to reduce brick firing time. The surface colouration of the bricks was also enhanced by the use of gasifier fines in the brick making process, which is economically attractive.Gas combustion studies have shown that flame temperatures approaching that of natural gas can be achieved by either combustion of fuel gas with an enhanced calorific value (sup 5 MJ /m3) produced by oxygen enrichment of the fluidising air, or by oxygen enrichment of the enrichment of the fluidising air, or by oxygen enrichment of the combustion air with normal low CV gases ( 3. 5 MJ/m3).Gas cleaning studies have shown thattwo stage cyclonic clean-up is unlikely to meet particulate emission standards. Two extended periods of operation with the bag filter have shown that an essentially dust free gas can be produced, which readily compiles with emission standards.Evaluation of results obtained during the whole operating programme has been carried out in conjunction with Otto Simon Carves (OSC) and to develop a commercial scale design package of the process completed.The existing British Coal 12 t/d gasification pilot plant at BC's Coal Research Establishment was constructed and operated with EEC support (LG/00045/83/UK) to demonstrate on a semi-commercial scale, BC's innovative, spouted fluidised bed gasification process for the production of low calorific value gas ( MJ/m3) for use in industrial process heating.The process involves fluidisation of a bed of char on an air/steam mixture. A major proportion of fluidising gas is introduced as a jet at the apex of the conical base, promoting rapid recirculation within the bed, enabling caking coals to be processed without agglomeration problems. Coal is fed overbed from a lock hopper with limestone at the level of 10% by weight of coal feed, added to retain up to 90% sulphur, which would otherwise be released in fuel gas. The gasifier is typically operated at 980 deg. C, with a bed height of 2 meters. The raw gas contains a high proportion of carbonaceous fines: these are collected in a high temperature cyclone and injected into the gasifier base by steam driven ejector, to maximise carbon conversion. A small char stream is continuously withdrawn from the gasifier to remove stone or debris.The work proposed involves modification of the existing plant in order to demonstrate two variants of the basic air blown system. The first involves modification of the plant to operate with inert bed materials in place of the char to increase the utilisation of carbon in-bed to increase process efficiency.The use of oxygen enriched fluidising gases as a means of increasing conversion efficiency and enhancing gas calorific value ( up to 8MJ/m3) will also be studied. The second involves incorporation of an innovative system for combustion of fines rejects from the process, and the injection of hot combustion products into the gasifier, thereby maximising process efficiency.The project will be executed in five stages commencing April 1, 1987 for completion by November 30, 1989, at a total cost of UKL 1,493,000 though EEC financing is related to activities associated with oxygen and fines combustion modification (the first Phase). This entails initiation of detailed mechanical design, carried out in two-four month phases mainly for provision of oxygen supply, and subsequently, incorporation of fines combustion system. The other Phases, apart from the first (design) Phase are:- installation;- commissioning;- operation;- evaluation.British Coal owns all rights to the process which is based on the use of a spouted fluidized bed. The gasification process is protected by patents BP1493604; BP11494006 and BP1511063. A patent application has been submitted to cover mechanics of the fines recycle system.In parallel with the process demonstration programme a number of activities will be undertaken to promote commercialisation of the technology in collaboration with the licensee Otto Simon Carves. Program(-y) ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989 Temat(-y) 6.1 - GASIFICATION Zaproszenie do składania wniosków Data not available System finansowania DEM - Demonstration contracts Koordynator BRITISH COAL CORPORATION (RESEARCH ESTABLISHMENT Wkład UE Brak danych Adres COAL RESEARCH ESTABLISHMENT STOKE ORCHARD, CHELTENHAM GL52 4RZ Gloucester Zjednoczone Królestwo Zobacz na mapie Koszt całkowity Brak danych
