Abstract: The present invention is a multiple purposed system of producing methane from its hydrates and sequestering carbon dioxide into its hydrates. Methane hydrates mixed with mud, prepared with methane mining assembly 23 are brought to sea surface by a series of buckets 16 attaching to rotating chains 18. The decomposed methane is collected into the methane dome 50 and is processed into liquefied natural gas or synthetic liquid fuels. Liquid carbon dioxide is brought down through a tube 70 and a sequestering device 86 into the sea where the pressure and the temperature are adequate for carbon dioxide hydrates to form and settle down to the sea bottom. The unconverted gaseous carbon dioxide is collected into carbon dioxide dome 49 and is liquefied again for recycling.

Abstract: A zero-pollution wastes disposal and clean-energy generation system is improved by introducing to it a catalyst to lower down the gasification temperature and to prolong the life of the gasification reactor, a simultaneous direct and indirect heat transfer to supply the heat required for carbon-steam reaction and a means for extracting clean water from raw sewage sludge to supply the steam required by carbon-steam reaction. These improvements increase the efficiency and economy of the system and promote the smoothness of its operation.

Abstract: An integrated gasifying apparatus for solid municipal waste, sewage sludge and coal utilizes a fluidized-bed gasifier from which the char enters a low-temperature fluid bed combustor and then a high-temperature fluid bed combuster. CaO is admitted to the gasifier to form part of the bed and calcined lime is carried out of the high temperature combustor. The product gases are separated to recover CO.sub.2 which is recirculated to the gasifier at least in part as a fluidizing gas.

Abstract: Methods for the physical and operational integration of a carbonaceous gasification plan, a gaseous fuel synthesis plant and a power generation station to economincally produce synfuel and electrical power comprising producing gases comprising carbon monoxide and hydrogen from carbonaceous raw materials in a gasification unit wherein the gasification unit utilizes exhaust steam from a power generating unit to provide various energy needs for producing synthesis gas, utilizing the hydrogen derived from the gasification unit in the liquefying and hydrogenation of coal or hydrogenation of natural gas in a fuel synthesis unit wherein the heat generated from the exothermic reactions in the fuel synthesis unit is employed to generate high pressure steam which is fed to a power generation unit to drive electrical power producing turbines wherein the exhaust steam from the turbine is used in the gasification unit as a heat source during gasification and collecting of steam condensate from the exhaust steam and recycl

Abstract: An integrated apparatus for the gasification of coal alone or with other carbon-containing materials such as solid municipal wastes, biomass and sewage sludges, wherein the endothermic heat required by the gasification reaction is supplied at least in a significant part by the exothermic reaction of CaO in the form of calcined lime or dolomite with carbon dioxide. The CO.sub.2 is recycled to provide a high CO.sub.2 vapor pressure for the exothermic reaction. The calcium carbonate formed in the reaction is decomposed in a combustor to produce the CaO which is recycled to the gasification stage.

Abstract: An integrated process for the gasification of coal alone or with other carbon-containing materials such as solid municipal wastes, biomass and sewage sludges, wherein the endothermic heat required by the gasification reaction is supplied at least in a significant part by the exothermic reaction of CaO in the form of calcined lime or dolomite with carbon dioxide. The CO.sub.2 is recycled to provide a high CO.sub.2 vapor pressure for the exothermic reaction. The calcium carbonate formed in the reaction is decomposed in a combustor to produce the CaO which is recycled to the gasification stage.