Plant continued gasification

By the mid-1950s, the availability of inexpensive natural gas and petroleum had led to the abandonment of most coal gasification units. However, even as oil and natural gas use increased, coal gasification plants continued to be built on a limited scale in certain areas of the world, particularly in countries with a limited supply of petroleum. 

Lack of a regional plastic waste volume to support the continuous operation of large-scale plants. For gasification, a minimum capacity about 400 000-500 000 tonnes per year is necessary. 

The high cost of coal handling and preparation and treatment of effluents, compounded by continuing low prices for cmde oil and natural gas, has precluded significant exploitation of coal as a feedstock for methanol. A small amount of methanol is made from coal in South Africa for local strategic reasons. Tennessee Eastman operates a 195,000-t/yr methanol plant in Tennessee based on the Texaco coal gasification process to make the methyl acetate intermediate for acetic anhydride production (15). 

Quite often, a variation of a proximate analysis or an ultimate analysis is requested, together with one or more of the miscellaneous analyses or tests discussed in this chapter. Restrictions that have been placed on the coal used in coal-fired power plants and other coal-burning facilities have created a need for more coal analyses as well as a need for more accurate and faster methods of analysis. This trend will continue, and more testing will be required with increased use of coal in liquefaction and gasification plants. 

Our tests on the Sanya biomass gasification-power generation plant so far have yielded positive results. The CFB technology is suitable for gasification of powdered wood material, and proves reliable in continuous operation under different load conditions. After passing the gas cleaning system, the producer gas can be used in the... 

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