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Title: Process design and economic analysis of the zinc selenide thermochemical hydrogen cycle

Abstract

A detailed preliminary design for a hydrogen production plant has been developed based on an improved version of the ZnSe thermochemical cycle for decomposing water. In the latest version of the cycle, ZnCl/sub 2/ is converted directly to ZnO through high temperature steam hydrolysis. This eliminates the need for first converting ZnCl/sub 2/ to ZnSO/sub 4/ and also slightly reduces the overall heat requirement. Moreover, it broadens the temperature range over which prime heat is required and improves the coupling of the cycle with a nuclear reactor heat source. The ZnSe cycle is driven by a very-high-temperature nuclear reactor (VHTR) proposed by Westinghouse that provides a high-temperature (1283 K) helium working gas for process heat and power. The plant is sized to produce 27.3 Mg H/sub 2//h (60,000 lb H/sub 2//h) and requires specially designed equipment to perform the critical reaction steps in the cycle. We have developed conceptual designs for several of the important process steps to make cost estimates, and have obtained a cycle efficiency of about 40% and a hydrogen production cost of about $14/GJ. We believe that the cost is high because input data on reaction rates and equipment lifetimes have been conservatively estimated and themore » cycle parameters have not been optimized. Nonetheless, this initial analysis serves an important function in delineating areas in the cycle where additional research is needed to increase efficiency and reduce costs in a more advanced version of the cycle.« less

Authors:
;
Publication Date:
Research Org.:
California Univ., Livermore (USA). Lawrence Livermore Lab.
OSTI Identifier:
6569052
Report Number(s):
UCRL-52546
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; HYDROGEN PRODUCTION; THERMOCHEMICAL PROCESSES; OXYGEN; PRODUCTION; ECONOMIC ANALYSIS; PROCESS HEAT REACTORS; SELENIUM; VHTR REACTOR; WATER; ZINC; ZINC SELENIDES; CHALCOGENIDES; CRYOGENIC FLUIDS; ECONOMICS; ELEMENTS; ENRICHED URANIUM REACTORS; EXPERIMENTAL REACTORS; FLUIDS; GAS COOLED REACTORS; GRAPHITE MODERATED REACTORS; HELIUM COOLED REACTORS; HTGR TYPE REACTORS; HYDROGEN COMPOUNDS; METALS; NONMETALS; OXYGEN COMPOUNDS; POWER REACTORS; REACTORS; RESEARCH AND TEST REACTORS; SELENIDES; SELENIUM COMPOUNDS; SEMIMETALS; THERMAL REACTORS; ZINC COMPOUNDS; 080102* - Hydrogen- Production- Thermochemical Processes

Citation Formats

Otsuki, H.H., and Krikorian, O.H. Process design and economic analysis of the zinc selenide thermochemical hydrogen cycle. United States: N. p., 1978. Web.
Otsuki, H.H., & Krikorian, O.H. Process design and economic analysis of the zinc selenide thermochemical hydrogen cycle. United States.
Otsuki, H.H., and Krikorian, O.H. Wed . "Process design and economic analysis of the zinc selenide thermochemical hydrogen cycle". United States.
@article{osti_6569052,
title = {Process design and economic analysis of the zinc selenide thermochemical hydrogen cycle},
author = {Otsuki, H.H. and Krikorian, O.H.},
abstractNote = {A detailed preliminary design for a hydrogen production plant has been developed based on an improved version of the ZnSe thermochemical cycle for decomposing water. In the latest version of the cycle, ZnCl/sub 2/ is converted directly to ZnO through high temperature steam hydrolysis. This eliminates the need for first converting ZnCl/sub 2/ to ZnSO/sub 4/ and also slightly reduces the overall heat requirement. Moreover, it broadens the temperature range over which prime heat is required and improves the coupling of the cycle with a nuclear reactor heat source. The ZnSe cycle is driven by a very-high-temperature nuclear reactor (VHTR) proposed by Westinghouse that provides a high-temperature (1283 K) helium working gas for process heat and power. The plant is sized to produce 27.3 Mg H/sub 2//h (60,000 lb H/sub 2//h) and requires specially designed equipment to perform the critical reaction steps in the cycle. We have developed conceptual designs for several of the important process steps to make cost estimates, and have obtained a cycle efficiency of about 40% and a hydrogen production cost of about $14/GJ. We believe that the cost is high because input data on reaction rates and equipment lifetimes have been conservatively estimated and the cycle parameters have not been optimized. Nonetheless, this initial analysis serves an important function in delineating areas in the cycle where additional research is needed to increase efficiency and reduce costs in a more advanced version of the cycle.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {9}
}

Technical Report:
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