Research Papers: Energy Systems Analysis

Advanced Concepts in Modular Coal and Biomass Gasifiers

[+] Author and Article Information
John P. Dooher

Physics Department,
Adelphi University Chairman,
One South Avenue,
Garden City, NY 11530
e-mail: dooher@adelphi.edu

Marco J. Castaldi

Chemical Engineering Department,
The City College of New York,
City University of New York,
140th Street | Convent Avenue Steinman Hall,
Room 307,
New York, NY 10031
e-mail: mcastaldi@ccny.cuny.edu

Dean P. Modroukas

Innoveering, LLC,
100 Remington Blvd.,
Ronkonkoma, NY 11779,
e-mail: Dean.Modroukas@Innoveering.net

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 10, 2016; final manuscript received May 29, 2018; published online August 9, 2018. Assoc. Editor: Ronald Breault.

J. Energy Resour. Technol 141(1), 012001 (Aug 09, 2018) (10 pages) Paper No: JERT-16-1364; doi: 10.1115/1.4040526 History: Received September 10, 2016; Revised May 29, 2018

The program involves the application of a novel gasification concept, termed a modular allothermal gasifier (MAG) to produce syngas from coal, biomass, and waste slurries. The MAG employs a steam-driven gasification process using a pressurized entrained flow reactor wherein the external wall surfaces are catalytically heated to 1000 °C via heterogeneous combustion of a portion of the produced syngas. The MAG can be fed by a hydrothermal treatment reactor for biomass and waste feedstocks, which employs well-developed hydrothermal processing technology using the addition of heat and water to provide a uniform slurry product. The hydrothermal treatment reactor requires no preprocessing and a clean syngas is produced at high cold gas efficiency (80%). Importantly, the MAG can operate over a wide range of positive pressures up to 3 MPa (30 bar) which provides process control to vary the output to match end-use needs or feedstock rate. The system produces minimal emissions and operates at significantly higher efficiency and lower energy requirements than pyrolysis, plasma gasification, and carbonization systems. The system is compact and modular, making it easily transportable, for example, to a variety of sites, including those where remoteness, inaccessibility, and space limitations would preclude competing systems. The system can be applied to small gasification systems without the increase in heat losses that plague conventional small scale gasifiers. Test results and model simulations are presented on a single tube system and analyses of a variety of configurations presented.

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Fig. 1

Conceptual schematic of heat generation for the MAG process

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Fig. 2

Conceptual schematic for homogenous heat generation for indirect gasification

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Fig. 3

Thermal output with 20 cm diameter MAG, RT 5–15 s, T = 1000 °C

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Fig. 4

Schematic of experimental gasifier apparatus and photograph of the system

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Fig. 6

Coal/water/slurry atomization with slurries

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Fig. 5

Detailed model and photograph of the micronized coal slurry injector in the MAG

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Fig. 7

Atomization properties of the MAG injector with N2 and CO2 atomizing gas

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Fig. 8

Effect of operating the MAG in recycle mode

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Fig. 9

Comparison of qualitative results of different diameter MAG reactors operating under varying pressures and flow rates

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Fig. 10

Operability map of the MAG reactor

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Fig. 11

Time evolution of syngas components during test

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Fig. 12

Experimental setup of catalytic wall testing

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Fig. 13

Rheogram for hydrothermal biomass slurry

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Fig. 14

Summary of the biosolids slurry testing



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