Showing papers on "Integrated gasification combined cycle published in 1981"

Catalysis of carbon gasification

Abstract: The conversion of carbon to its oxide gases or methane, by interaction with oxygen, steam, hydrogen or carbon dioxide, are reactions of great practical importance. The oxidation of carbon to CO2 and CO provides much of mankind's heat and power, and the formation of “syngas” (a mixture of carbon monoxide and hydrogen) by steam gasification of carbon is an important step in the conversion of coal to synthetic petroleum (PHYSICS TODAY, August 1978, page 32). These reactions, together with the hydrogenation of carbon to form methane, and its interaction with CO2 to form CO, are the principal gasification reactions of carbon.

Recycle of carbon di:oxide to air and steam coal gasifier - driving gas turbine, increases overall process energy

Abstract: A gas turbine is driven by the prods. of combustion of lean gas from the pressure gasification of coal with steam and air. The novelty is in the arrangements for recycling the CO2 produced in this gasification to the gasifier. The gasifier effluent passes to a waste heat boiler and thence to a H2S- and CO2- removal washer, run at approx. the dew point of the raw gas and at gasifier pressure. The CO2 regenerated from the wash liquid is mixed with a side stream of air from the gas turbine compressor, and the mixt. further compressed and returned to the gasifier. The arrangement displaces gasification steam, thereby reducing the amt. of latent heat in the stack gas and increasing the energy of the integrated process. Further, the steam displaced from the pressure gasifier can be used to generate power in a steam turbine.

Power plant, operation and control method thereof and control system thereof

Abstract: A combined cycle coal gasification power plant includes a coal gasifier which generates low BTU coal gas for consumption by a gas turbine. Before being applied to the gas turbine, the coal gas is passed through a clean-up system which removes undesirable constituents from the coal gas. Efficient operation of the clean-up system requires that a predetermined discharge pressure of clean coal gas leaving the clean-up system must be maintained. A control system controls the coal gasifier according to either one of the discharge pressure of clean coal gas and the turbine power output requirement while maintaining the clean coal gas discharge pressure and power output at predetermined values.

Development of the Shell-Koppers Coal Gasification Process

Abstract: The Shell-Koppers process for the gasification of coal under pressure, based on the principles of entrained-bed technology, is characterized by: practically complete gasification of virtually all solid fuels; production of a clean gas without by-products; high throughput; high thermal efficiency and efficient heat recovery; environmental acceptability. There are numerous possible future applications for this process. The gas produced (93-98 vol. % hydrogen and carbon monoxide) is suitable for the manufacture of hydrogen or reducing gas and, with further processing, substitute natural gas (s.n.g.). Moreover, the gas can be used for the synthesis of ammonia, methanol and liquid hydrocarbons. Another possible application of this process is as an integral part of a combined-cycle power station featuring both gas and steam turbines. The integration of a Shell-Koppers coal gasifier with a combined-cycle power station will allow of electricity generation at 42-45 % efficiency for a wide range of feed coals. The development programme includes the operation of a 150 t/day gasifier at Deutsche Shell’s Harburg refinery since November 1978 and of a 6 t/day pilot plant a Royal Dutch Shell’s Amsterdam laboratories from December 1976 onwards. Both facilities run very successfully. With hard coal a conversion of 99% is reached while producing a gas with only 1 vol. % CO 2 . The next step will be the construction and operation of one or two 1000 t/day prototype plants which are scheduled for commissioning in 1983-4. Towards the end of the 1980s large commercial units with a capacity of 2500 t/day are contemplated. The economy, especially of these large size units, is very competitive.

Coal gasification and power generation

Abstract: This paper describes the evolution and present status of the Cool Water Coal Gasification Program. The Program will build and operate a 100 mw coal gasification combined cycle power plant to be located in southern California and planned for startup in late 1983. Plant design features such as configuration, performance, and environmental characteristics are discussed.

Clean coal gasification

Abstract: A process for gasifying coal and other carbonaceous mat­ ter is disclosed which produces fuel gas containing low con­ centrations of polycyclic aromatic hydrocarbons. In this pro­ cess the polycyclic aromatic hydrocarbons released by the coal during devolatilization and formed during pyrolysis of volatile matter are decomposed thermally in the presence of hydrogen, at a sufficiently high partial pressure (obtained by increasing the total pressure in the gasifier) to prevent polymerization of free radicals formed during pyrolysis. A relationship between the temperature, the gas residence time in the gasification reactor, the hydrogen partial pressure (i.e., total pressure in the gasifier), and the coal feed conditions are specified to achieve "clean" coal gasification.