The CCG® method includes three process stages
The pulverized coal is pneumatically brought into a pressurized dosing and feed system, fluidized therein and conveyed as ?pulverized coal - carrier gas - dispersion to the gasification reactor.
Advantages of this pneumatic dense flow conveying are high constancy and good controllability of the dust stream and an almost wearless conveying even with abrasive dusts. Compared with a feed as a pulverized coal - water - suspension, a higher gasification efficiency is achieved at a low oxygen consumption because no additional water must be evaporated from the suspension.
Gasifying the pulverized coal occurs by partial oxidation in the air current with the supply of oxygen and water vapor at elevated pressure. The carbon combines with the oxygen to form carbon monoxide.
The CCG® - gasifier has an optimized dust burner system regarding to the burnout. At the same time, the investment and operating costs were compared with those of known solutions significantly reduced.
The ruling temperatures in the oxidizing flame zone (> 2000 ° C) above the melting point of the fuel ash guarantee a fast and almost complete fuel conversion. All hydrocarbons are completely decomposed.
The gasification chamber is covered by a cooling screen. The dross solidifies inside on the cooling screen and forms a protective film against thermal overcharge of the reactor.
As a thermotechnical favorable solution the raw gas escapes together with the molten dross from the molten slag enters together from the reaction chamber, whereby the of risk disturbance in the dross discharge is considerably reduced.
The separation of the raw gas from the liquid dross is carried out during the subsequent quenching. The granulated dross can be used as building material.