Which gentleman/madam has the technical documentation on Destec water-coal slurry gasification?

The Wabash River IGCC power plant in the United States uses Destec gasifiers, which also employ a coal slurry feeding method. The Destec gasifier was developed on the basis of the Texaco gasifier, addressing some of its major shortcomings, but it still uses a water-coal slurry feeding method and liquid slag discharge. However, the gasification of water-coal slurry is carried out in two stages. The water-coal slurry is injected in two stages. 80% of the total amount of water-coal slurry is injected into the reaction zone, and the temperature in the reaction zone ranges from 1371 to 1427°C. 20% water-coal slurry is injected into the secondary reaction zone, where the temperature is around 1038°C. In this zone, the volatile components of the coal are released and undergo partial gasification; the temperature of the gas emitted from this zone is 900°C. It is divided into a horizontal high-temperature reaction section at 1400°C and a vertical water-coal slurry quenching section. The generated gas flows upward and is discharged from the top of the gasifier at a temperature of about 1040°C, after which it enters a convective fire-tube waste heat boiler to recover heat and produce saturated steam. During the operation of the unit, ash deposition occurred in the inlet pipeline of the waste heat boiler, limiting the unit’s operating time. The Destec gasifier, which uses a two-stage gasification process, has three main advantages:  The efficiency of cold gas production increases, to around 80%–82%. This is because a larger amount of light hydrocarbons such as CH4 is produced in the second reaction zone, which helps to increase the lower calorific value of the synthetic gas. It is possible to reduce the temperature of the crude gas to 900°C without the need for expensive and bulky radiative coolers. This will help to reduce the specific investment cost of IGCC. The amount of water vapor contained in the wet gas coming out of the gasifier is less compared to that in Texaco gasifiers, which simplifies the process for recovering the latent heat of the hot gas. Since the Destec gasifier uses multiple fuel nozzles, its capacity per unit can be designed to be larger than that of Texaco gasifiers. Due to the higher production of hydrocarbons such as CH4 in the secondary reaction zone, the calorific value of the gas produced by the Destec gasifier is also higher; the efficiency of the cold gas can reach 80%–82%. The outlet temperature of the raw coal gas is 900°C, so there is no need to use expensive coolers, resulting in lower investment costs. However, the result of these two gasification stages leads to a decrease in carbon conversion rate; therefore, fly ash recycling measures must be taken to allow the unvaporized carbon particles in the fly ash to return to the first reaction zone. After adopting this measure, the carbon conversion rate can reach over 99%. It must be noted, however, that in order to ensure the proper operation of the second gasification zone within the gasifier, the reaction temperature in this zone must be controlled properly; otherwise, if the temperature is too low, coal tar is likely to be produced.

The second floor explains it in great detail. There are no more Destec furnaces now; it seems they were originally a technology from DOW Chemical, due to patent issues with TAXECO.