Integrated catalytic adsorption steam gasification in a bubbling fluidized bed for enhanced H₂ production: perspective of design and pilot plant experiences

Abstract

It is important to build knowledge about the design of an integrated catalytic adsorption (ICA) steam gasification process in a bubbling fluidized bed, which can reduce CO2 content with enhanced hydrogen production. The value of this study is its presentation of detailed design considerations for the performance evaluation of an ICA system using palm oil waste as feedstock. The main advantage of using ICA gasification systems is the CO2 adsorption through a carbonation reaction (using CaO), which helps the water gas shift reaction to move forward. The activity of a catalyst improves steam methane reforming in parallel, which not only produces additional hydrogen but also releases CO to enhance the activity of the water gas shift reaction. The performance of the developed system has shown <1% of temperature variation inside the reactor, which suggested a positive role for exothermic reactions between reactive bed material (CaO) and CO2 in the product gas. The low pressure drop in the gasifier (100–130 mbar) further strengthens the design strategy for the ICA gasification system for hydrogen production. Challenges encountered during the pilot plant operations, and their potential solutions, are discussed to optimize the operation, especially for downstream equipment and auxiliaries. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

Design, instrumentation, and operation of a standard downdraft, laboratory-scale gasification testbed utilising novel seed-propagated hybrid Miscanthus pellets

“…The thermocouples were placed within the gasifier in the drying (T01), pyrolysis (T02), middle of the throat (T03), and bottom reduction (T04, above the grate) zones and below the grate (T05), as shown in Figure 2. The hot gas filter has an additional thermocouple (T07) as shown Figure 1 which was used to control the temperature of the heating tape to maintain the filter's temperature at 350 °C and to avoid any tar condensation on its surface [22]. The remaining thermocouples were located at the exit of the gasifier (T06), at the exit of the hot gas filters (T07), before (T08) and after (T11) the condenser, at the cold water inlet (T10) and at the hot water outlet (T09) linked to the condenser.…”

NO and SO2 emissions in palm kernel shell catalytic steam gasification with in-situ CO2 adsorption for hydrogen production in a pilot-scale fluidized bed gasification system

“…Oil palm wastes are available abundant in Malaysia and can be utilized as a renewable resource for power generation and value-added bioproducts. Malaysia and Indonesia are largest producer of oil palm worldwide and collectively produced 12.8 Mt of PKS in 2015 (Khan et al, 2018a). The better physical properties among other oil palm wastes i.e.…”