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Zinc Titanate Tests in Transport Reactor

IP.com Disclosure Number: IPCOM000217244D
Publication Date: 2012-May-04
Document File: 5 page(s) / 304K

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Zinc Titanate Tests in Transport Reactor

CONTRACT IN-FORMATXON Contract Number

DE-AC21-88MC25006

Contractor

Research Triangle Institute
P.O. Box 12194
Research Triangle Park, NC 27709-2194 919-541-8023

Contractor Project Manager Santosh K. Gangwal Subcontractor

The M.W. Kellogg Company P.O. Box 4557
Houston, TX 77210-4557 713-537-8534

Subcontractor Project Manager William M. Campbell Principal Investigator

Raghubir P. Gupta (RTI)

GunnarB. Henningsen (MWK)

METC Project Manager

Daniel C. Cicero

Period of Performance

June 1995 - September 1995

OBJECTIVES

 The M.W. Kellogg Companyis developing a Transport reactor process which promises to reduce the cost of the hot gas desulfurization system in IGCC power plants. Research Triangle Institute (RTI) has been developing proprietary fluidized- bed zinc titanate sorbents for hot gas desulfurization applications for the past five years with DOE/METC sponsorship. These sorbents are prepared using granulation and spray drying techniques. Recently, RTI and Contract Materials Processing (CMP), Inc. have teamed up to produce a spray-dried zinc titanate formulation, ZMP-5, in the 100-250 pm particle size range. TES size range is preferred by Kellogg for the Transport reactor application.

 Kellogg, in cooperation with RTI, will perform scoping and multi-cycle tests with ZMP-5 sorbent in its new bench-scale Transport Reactor Test Unit (TRTU-11). The objective of the test program is to establish an appropriate range of operating conditions for the use of this sorbent formulation in a Transport reactor system.

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BACKGROUND INFORMATION

 A fixed-bed hot gas desulfurization (HGD) system was tested at the KRW, Waltz Mill, Pennsylvania, Process Development Unit. In this unit zinc ferrite was tested in both bulk and polishing modes of operation. When the Pifion Pine Power project was selected by the USDOE in Clean Coal Round IV,three zinc-based sorbents were tested at the Morgantown Energy Technology Center (METC) for the fixed-bed HGD application. In this testing, zinc ferrite and zinc titanate tended to decrepitate over extended multi-cycle testing. It was thought that this decrepitation was caused by the inherent high loading of sulfur on the sorbent in the fixed bed configuration. A third material, 2-Sorb sorbent, developed by Phillips Petroleum Company, showed no signs of decrepitation, but tended to lose capacity over time when regenerated in the presence of steam.

  One way to avoid the high sulfur loading on the sorbent and to avoid using steam for heat dissipation during regeneration is to use a Transport reaction system. Kellogg first checked this idea in proof-of-concept tests in 1993. In these first tests, the 2-Sorb sorbent was used and there was no detectable leakage of sulfur from the Transport Absorber over a wide range of operating conditions. By limiting the amount of oxidant used during regeneration, such that only partial regeneration is accomplished, the sorbent acted as the h...