In-depth analysis of the advantages and features of E-Gas™ gasification technology

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In-depth analysis of the advantages and features of the E-Gas™ gasification technology Author/Source: Gasification World Date: 2021-03-23 Clicks: 13 1 Overview The E-Gas™ gasification technology has been in industrial use for nearly 30 years and holds a leading position in the entire gasification industry. The goal of developing this technology has always been to utilize solid fuels in an environmentally friendly, safe, and efficient manner for power generation, coal-to-natural gas production, coal-to-hydrogen production, as well as other industrial processes that involve the manufacture of chemicals. The E-Gas technology is very unique, as our design is based on the continuous accumulation and transmission of operational experience from numerous Rumus devices. 2 Advantages http://img.yf116.cn/image/img/20210323/10593630950.jpg 3 Performance Features ■ A special feeding system helps to increase the carbon conversion rate, which exceeds 99%. ■ Fixed-mounted start-up burners ensure that the gasification furnace can be started or restarted more easily and safely. ■ The continuous slag removal system eliminates the need for expensive and frequently maintained hoppers and slag transportation systems. ■ The patented two-stage gasification furnace design not only enhances the furnace’s adaptability to different feedstocks but also increases the calorific value and energy efficiency of the syngas. ■ The unique fire-tube type syngas cooler reduces the size and cost of heat recovery equipment while maintaining high efficiency; the high-pressure steam generated as a by-product amounts to over 100 kilograms, making it highly valuable. ■ The dry solid particle removal and recycling system improves the carbon conversion rate and prevents the formation of black water or gray water, thus eliminating wastewater within the core gasification technology area. ■ Most of the water generated or collected outside the gasification framework can be recycled back into the furnace, further increasing the carbon conversion rate and reducing wastewater volume. 4 Process Flow Diagram 5 Process Description The E-Gas™ gasification technology is characterized by oxygen-based gasification, continuous slag removal, and a two-stage fluidized bed reactor. Coal and water are fed into the rod mill together to be ground into a slurry. The coal slurry is mixed with high-purity oxygen and then injected into the first section of the gasification reactor. High-purity oxygen is supplied by the air separation unit outside the boundary zone. After being produced, the syngas enters a syngas cooler to recover heat and generate high-pressure steam as a by-product. After leaving the syngas cooler, the particulates (semi-coke) in the syngas are removed in a dry filter. The semi-coke is returned to the gasifier to further convert the residue carbon into syngas. After synthesis gas is formed, it is washed with water to remove chloride ions. The washed syngas is then divided into two streams: a small portion is recycled, while the majority leaves the zone for further processing. In the first section of the gasifier, the coal slurry undergoes partial oxidation, with the reaction temperature exceeding the melting point of the ash in solid fuels. The liquid slag falls from the slag discharge port at the lower section of the gasification furnace into the water quenching chamber, where it forms inert glassy coal slag. The coal cinder is discharged continuously, and the residual carbon in the slag water is separated and recycled back to the reaction section of the gasifier for further conversion. The syngas then enters the second stage of the gasifier, where more coal slurry is injected. This portion of the coal slurry undergoes an exothermic decomposition reaction with high-temperature syngas, thereby increasing the calorific value of the syngas and the overall efficiency.