Sulphur solar fuel for on demand power generation. Int. Workshop on Solar Thermochemistry, Juelich, Germany
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1 DLR.de Chart 1 Sulphur solar fuel for on demand power generation Int. Workshop on Solar Thermochemistry, Juelich, Germany Dennis Thomey, Christos Agrafiotis, Nicolas Overbeck, Martin Roeb, Christian Sattler Co-funded by the Horizon 2020 Framework Programme of the European Union
2 DLR.de Chart 2 Contents Sulphur as industrial commodity Sulphur as thermochemical storage Solar sulphur power generation Background of DLR on sulphur cycles European project PEGASUS Conclusions and outlook
3 DLR.de Chart 3 Comparison of energy storage densities Technology Energy density (kj/kg) Hydrogen 141,886 1 Gasoline 47,357 1 Sulphur 9,281 2 Molten Salt Lithium Ion Battery Elevated water Dam (100m) College of the Desert 2 General Atomics
4 DLR.de Slide 4 Sulphur in industrial processes Sulphur is required for sulphuric acid (SA) production SA is world s most produced chemical Global annual rate >200 Mio. tons SA is measure of industrial development SA is mainly needed for fertiliser production Sulphur pile Sulphuric acid plant Sulphur from desulphurisation of hydrocarbons via Claus process Claus process Sulphur is by-product of metallurgic processes Ore roasting
5 DLR.de Slide 5 Sulphur world production 2014 Total of 69.1 Mio. tons (avg. world price of US$160 per ton) 8,4 12,5 Metallurgy (smelting of sulphide ores) 7,8 By-product sulphur from refineries etc. (processing natural gas, petroleum and oil sands) Mining (pyrite, native sulphur, underground deposits) 40,5 Mio. tons Other Source: 2014 Minerals Yearbook, SULFUR, U.S. Geological Survey
6 DLR.de Slide 6 Transportation and storage of sulphur In solid or liquid form Train Pipeline Molten Sulphur Rail Car Molten sulphur in heated pipelines (~140 C) Truck Ship Molten sulphur trailer
7 DLR.de Slide 7 Thermochemical sulfur storage cycle for on-demand solar power production Concentrated Solar Power 2 H 2 O H 2 SO 4 + S <200 C (liq. phase) ΔH = -254 kj/mol On-demand Electrical Power + H 2 O Sulphuric Acid Decomposition Disproportionation Sulphur Combustion 2 H 2 SO 4 2 H 2 O O 2 >800 C ΔH = 551 kj/mol H 2 SO 4 S S + O 2 >1000 C ΔH = -297 kj/mol Sulphuric Acid Sulphur
8 DLR.de Slide 8 PEGASUS Process diagram Solar particle receiver 900 C Solar field Hot particles storage tank O 2 Oxygen SO 3 Decomposer O 2 H 2 O Gas Separation Storage H 2 O Disproportionate Reactor 600 C 100 C Cold particles storage tank H 2 SO 4 Evaporator SO 3, H 2 O Electricity O 2 N 2 Sulphuric Acid Storage Absorbers Contact process Steam Steam Turbine Water Storage SO 3, O 2, N 2 Gas Turbine H 2 O H 2 SO 4 Concentrator dilute H 2 SO 4 O 2 N 2 S Sulphur Storage Sulphur Burner Air Solar site Non-solar site
9 DLR.de Slide 9 Integration of solar sulphur power generation Solar particle plant Hot particles Particle reactor (sulphuric acid splitting) Sulphuric acid Disproportionate reactor Sulphuric acid plant SO 3 Sulphur Electrical power Sulphur gas turbine plant Refinery
10 DLR.de Slide 10 Solar-to-fuel efficiency Solar particle receiver ~90% ~60% 900 C Solar field H R 1 = 826 J/mol S ~90% 600 C 100 C SO 3 Decomposer H 2 SO 4 Evaporator Hot particles storage tank O 2 H 2 O SO 3, H 2 O Sulphuric Acid Storage O 2 Gas Separation Oxygen Storage Water Storage H 2 O H 2 O H 2 SO 4 Concentrator Disproportionate Reactor dilute H 2 SO 4 S Heat recovery ~90% ( H R 2 = -254 J/mol S) Cold particles storage tank Electricity O 2 N 2 H R b = -99 J/mol S solar-to-sulphur =( H r a + H Rb )/ H R 1 Absorbers ( H c Sulphur R = -176 J/mol S) SO Storage 3, O 2, N 2 solar-to-sulphur ~21% Contact process Steam Steam Turbine ~600 C Gas Turbine O 2 N 2 >1000 C Sulphur Burner Air H R a = -297 J/mol S
11 DLR.de Slide 11 Research of DLR on sulphur cycles Experience on solar sulphuric acid cracking since more than 20 years Research on Hybrid Sulphur Cycle in European projects HYTHEC, HycycleS and SOL2HY2 ( ) Development and on-sun testing of receiver/reactors in solar furnace Construction of pilot unit and demo operation on solar tower Modelling of reactors Testing of catalysts and construction materials Flowsheeting and techno-economics of HyS process Scale-up concepts Catalyst testing Solar furnace reactor Solar tower demo
12 DLR.de Slide 12 Project Baseload (Sulfur Based Thermochemical Heat Storage for Baseload Concentrated Solar Power Generation) Funding: United States Department of Energy (DOE) 2 project phases from 2010 to 2013 GO/NO-GO review after phase I Phase I completed in Mar GO recommendation for Phase II (May 2012 Oct. 2013) Coordinator: General Atomics (GA), USA disproportionation Sulfur combustion Experiments, plant design, flowsheeting, economics Subcontractor: German Aerospace Center (DLR) H 2 SO 4 decomposition Experiments, modeling Funded work and in-kind contribution
13 DLR.de Slide 13 PEGASUS partners DLR, Germany (Coordinator) Solar tower/simulator owner/operator Solar receiver/reactor developer APTL/CERTH, Greece Catalyst materials developer KIT, Germany Combustion specialist Baltic Ceramics, Poland Advanced ceramics manufacturer Processi Innovativi, Italy Power plant designer/contractor BrightSource, Israel CSP plant designer/contractor Research institute University SME Industry
14 DLR.de Slide 14 PEGASUS Work plan WP1: Catalytic particles development, manufacturing APTL, Baltic Ceramics WP2: Centrifugal particle solar receiver DLR Preparation of existing test receiver On-sun test operation with catalytic particles (WP1) WP3: Sulphur trioxide decomposer + WP4: Sulphuric acid evaporator DLR Development and construction of moving bed reactors with direct (WP3) and indirect (WP4) heat transfer Off-sun test operation WP5: Sulphur Combustor KIT Development, construction and operation of sulphur burner WT6.1, 6.5, 6.6:Overall concept evaluation Processi Innovativi, BrightSource System modelling, flowsheeting, techno-economy WT : System integration, test operation DLR Integrated operation of solar receiver (WP2) and sulphuric acid splitting reactors (WP3, WP4)
15 DLR.de Chart 15 Centrifugal particle solar receiver optimization Application of pilot receiver developed in CentRec project Centrifugal particle receiver was erected on scaffold in front of Juelich Solar Tower Nominal power: 2.5 MW th Diameter of aperture: 1.13 m Max. particle temperature: 1000 C Commissioning is in progress Solar testing of CentRec pilot planned to start in autumn 2017 Project PEGASUS Pre-testing of catalytic particles in CentRec pilot Integrated testing together with particle reactors for sulphuric acid splitting planned in last project year
16 DLR.de Slide 16 Design options for decomposer and evaporator SO 3 decomposer Direct contact Sulphuric acid evaporator Indirect heat transfer (tube/plate HX) Particles 900 C, O 2, H 2 O C C Particles C SO 3, H 2 O 400 C SO 3, H 2 O 400 C H 2 SO 4 25 C Particles C Particles 100 C
17 DLR.de Chart 17 Conclusions and outlook Sulphur is one of the most important commodity of chemical industry Sulphur has high thermochemical energy density Transportation and storage of solid or liquid sulphur is industrial practice Solar sulphur cycle for baseload and on-demand power production Estimated solar-to-fuel efficiency of ~21% Potential for integration of sulphur cycle into existing sulphuric acid plants Investigation of solar sulphur cycle in European project PEGASUS Development of catalytically active solar particles Construction of particle reactor for sulphuric acid splitting Prototype development of sulphur burner for gas turbine
18 DLR.de Chart 18 Thank you for your attention! Co-funded by the Horizon 2020 Framework Programme of the European Union
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