Improving Flexibility of IGCC for Harmonizing with Renewable Energy - Osaki CoolGen s Efforts -

Transcription

1 Improving Flexibility of IGCC for Harmonizing with Renewable Energy - Osaki CoolGen s Efforts -

2 Table of Contents 1. Project Background 2. Progress of Osaki CoolGen Project (1) Outline of Osaki CoolGen Project (2) Progress of the Step 1 Demonstration of Oxygen-blown IGCC (3) Progress of the Step 2 Demonstration of IGCC with CO2 capture 3. Challenges for Improving Flexibility 4. Goal of Osaki CoolGen Project 1

3 Table of Contents 1. Project Background 2. Progress of Osaki CoolGen Project (1) Outline of Osaki CoolGen Project (2) Progress of the Step 1 Demonstration of Oxygen-blown IGCC (3) Progress of the Step 2 Demonstration of IGCC with CO2 capture 3. Challenges for Improving Flexibility 4. Goal of Osaki CoolGen Project 2

4 Development Roadmap of HELE Coal Power Generation Technology in Japan Fuel Cell(FC) Integrated coal Gasification Fuel Cell combined cycle (IGFC) (MCFC) (SOFC) HRSG Integrated coal Gasification Combined Cycle(IGCC) Pulverized Coal Fired(PCF) Boiler Gasifier Gas turbinesteam turbine Steam turbine HRSG Super Critical (SC) 1300 IGCC 1500 IGCC 1700 IGCC Ultra SC (USC) Fuel cell Gas turbine Gasifier 55%~ CO 2 reduction about 30% 46 ~ 48% CO 2 reduction about 15% Advanced USC (A-USC) 38% 39 ~ 41% 46 ~ 48% base Steam turbine Efficiency :Net / Higher heating value 3

5 Significance of Osaki CoolGen Project Global Sustainable Development Efficiently use low cost coal for increased Power Demand Drastically reduce CO2 emissions against Global Warming In Resources Importing Countries (as Japan) Coal is indispensable to achieve sustainable power supply Development of High Efficient Clean Coal Technology Osaki Coolgen Demonstration Project Oxygen-blown IGCC (Step-1) (Step-2) (Step-3) IGCC + CO2 Capture IGFC + CO2 Capture 4

6 5 Significance of Developing Oxygen-blown Type EAGLE Gasifier High efficiency and low carbonization of coal-fired power generation and effective utilization of coal and its byproduct Drastically to improve power generation efficiency and significantly to reduce carbon dioxide emission. Efficiently to capture CO 2 by pre-combustion method. To use low-grade coal(sub-bituminous coal and brown coal) and highgrade coal(bituminous coal) for gasification. To re-use coal ash and reduce in volume as slug of glass type Multi-purpose uses of coal gasification gas For the gasification gas to be widely used as synthetic fuels and chemical raw materials.

7 Feature of EAGLE Gasifier Oxygen-blown, Two-stage, Spiral-flow Gasifier Syngas CO,H 2 etc Upper stage burner CO H2 Upper stage: Lean oxygen Coal Char Char + CO2 + H2O CO + H2 Oxygen Heat Recovery Section Pulverized coal H2O CO2 Lower stage burner Slag Low High Temperature Lower stage: Lean oxygen Gasification Section Quench Section Slag High-efficiency gasification + Coal + O2 CO2 + H2 Stable slag discharge 6

8 Applicable Coal Types for EAGLE Gasifier Fixed carbon/volatile matter [-] [-] 2.50 EAGLE Gasifier Pulverizing PCF Power Coal Plant Fired Conventional Previous Gasifier Sub bituminous Coal area :EAGLE Pilot Project EAGLE Achievement Bituminous Coal : area Pilot Project Ash Melting Temperature temperature [ ] [ ] Source : JPOWER EAGLE brochure 7

9 Table of Contents 1. Project Background 2. Progress of Osaki CoolGen Project (1) Outline of Osaki CoolGen Project (2) Progress of the Step 1 Demonstration of Oxygen-blown IGCC (3) Progress of the Step 2 Demonstration of IGCC with CO2 capture 3. Challenges for Improving Flexibility 4. Goal of Osaki CoolGen Project 8

10 Outline of Osaki CoolGen Project Fiscal Environmental assessment Feasibility study Step1 Oxygen-blown IGCC Step2 IGCC with CO 2 capture unit Step3 IGFC with CO 2 capture unit Feasibility Study Feasibility Study Design, manufacturing, construction Feasibility Study Demonstration Design, manufacturing, construction Design, manufacturing, construction Demonstration Demonstration Step-1 Gasifier Gas Clean-up CO,H2 Step-2 CO 2 CO 2 Transportation/storage* ASU N2 O2 Coal Compressor GT ST H2-rich gas Step-3 Generator Fuel Cell * The project does not include CO 2 transportation and storage. 9

11 Project Scheme METI (FY2012~2015) : Ministry of Economy, Trade and Industry NEDO(FY2016~ ) : New Energy and Industrial Technology Development Organization The Chugoku Electric Power Co., Inc. (Energia) Electric Power Development Co., Ltd. (J-POWER) Subsidy Joint Investment Osaki CoolGen Corporation 10

12 Table of Contents 1. Project Background 2. Progress of Osaki CoolGen Project (1) Outline of Osaki CoolGen Project (2) Progress of the Step 1 Demonstration of Oxygen-blown IGCC (3) Progress of the Step 2 Demonstration of IGCC with CO2 capture 3. Challenges for Improving Flexibility 4. Goal of Osaki CoolGen Project 11

13 Oxygen-blown IGCC Process Flow (Step-1) Coal pretreatment; pulverized coal blowing unit Coal Mill Gasifier Coal gasification unit Syngas cooler Cyclone filter Gas clean-up unit COS: Carbonyl sulfide H 2 S: Hydrogen sulfide Sulfur recovery unit Hopper Air Slag Char recycle First water scrubber COS converter Second water scrubber H 2 S absorber H 2 S regenerator Acid gas furnace Gypsum Air separation unit O 2 N 2 Combined cycle unit Air Compressor Rectifier DeNOx HRSG Stack Water treatment unit Air Comp. Gas turbine Steam turbine G Waste water Treated water Sludge Cooling water Condenser Mitsubishi Hitach Power Systems, LTD JGC Corporation Diamond Engineering Co. Ltd. 12

14 Demonstration Targets and Results (Step1) Item Targets Results Plant efficiency Net efficiency 40.5% (HHV) Net efficiency 40.8% (HHV) Achieved Environmental performance SOx : 8ppm NOx : 5ppm Particulate : 3mg/m 3 N (O2 equivalent 16 %) SOx : <8ppm NOx : <5ppm Particulate : <3mg/m 3 N (O2 equivalent 16 %) Achieved Coal types compatibility Applicable to variety coal Verified with a design coal Planning more kinds of coal In progress Reliability Commercial-level annual plant availability of 70% or higher (5,000 hours endurance test) Endurance test 5,119h(accumulated) Continuous operation 2,168h Achieved Plant controllability & operability Commercial-level (load change rate of 1-3%/min) Load change rate ~10 %/min Achieved Economy To obtain a prospect of the equivalent or less generating cost with commercial PCF plant Under analyzing the demonstration data Continue to analyze In progress 13

15 Table of Contents 1. Project Background 2. Progress of Osaki CoolGen Project (1) Outline of Osaki CoolGen Project (2) Progress of the Step 1 Demonstration of Oxygen-blown IGCC (3) Progress of the Step 2 Demonstration of IGCC with CO2 capture 3. Challenges for Improving Flexibility 4. Goal of Osaki CoolGen Project 14

16 Major Specifications (Step2) CO2 Capture Test Feed Gas CO shift section CO 2 Capture method 17% slipstream syngas equivalent to 15% of total CO 2 volume Sweet Shift (Downstream of AGR) Physical solvent (Selexol Max TM ) Sour Shift Catalyst Pilot Test Feed Gas Sour Shift (Upstream of AGR) 15

17 Demonstration Test Targets (Step2) Item Targets CO 2 capture performance CO 2 Capture rate *1 : 90% or more CO 2 Purity : 99% or more Plant Efficiency To obtain a prospect of 40%(HHV) net efficiency while capturing 90% of CO 2 volume in newly-installed commercial-scale IGCC with 1,500 C class gas turbine Operability To establish load-following operation procedures of CO 2 plant in IGCC system capture Economy To evaluate cost per amount of recovered CO 2 in the commercialscale IGCC using cost target data shown in the Development Roadmap of CO2 Capture Technology as a benchmark *1. CO 2 Capture rate: (Amount of C in the captured CO 2 gas / Amount of C in the gas introduced in the CO 2 capture unit)

18 Table of Contents 1. Project Background 2. Progress of Osaki CoolGen Project (1) Outline of Osaki CoolGen Project (2) Progress of the Step 1 Demonstration of Oxygen-blown IGCC (3) Progress of the Step 2 Demonstration of IGCC with CO2 capture 3. Challenges for Improving Flexibility 4. Goal of Osaki CoolGen Project 17

19 Background of Challenges for Improving Flexibility 18 Changes in social environment Thermal power plants are required output adjustability under the expansion of renewable energy The potential of oxygen-blown IGCC We have realized the further potential of operability in the oxygen-blown IGCC through the demonstration test Challenges for improving flexibility in oxygen-blown IGCC

20 Operational Flexibility to be Required for Thermal Power Plant [ 10MW] Demand & supply balance in Kyushu area (April 30 th 2017) Changes in social environment (1) Demand Curve Pumped Storage Power Generation Pumping up water Pumped Storage Power Generation Termal etc. Thermal etc. PV output 5,650MW (over half of the total demand) Decrease of output of thermal power generation Increase of output of thermal power generation Nuclear, Hydro, Geothermal 0 o clock 6 o clock 12 o clock 18 o clock 24 o clock Source: Agency for Natural Resources and Energy HP Essential flexibility of thermal power plant for power grids stability Normal Operation Improvement of load change rate : Rapidly adjust to electric power demand with fluctuation of renewable energy Reduction of minimum load : Flexible respond to decreasing demand for thermal power generation Emergency Operation Rapidly start & stop:respond to sudden change of demand and supply due to power grids accident 19

21 Feature of Power sources Changes in social environment (2) Source: Trade statistics, Ministry of Economy, Trade and Industry (METI) s cost working report in 2015, Agency for Natural Resources and Energy s report and Central Research Institute of Electric Power s report 20

22 Characteristics of Oxygen-blown IGCC Having high Load Change Rate The Potential of Oxygen-blown IGCC (1) Lock hopper system and differential pressure carrier system have high load followability Coal Few operational constraints and high followability because of the small heat capacity Gasifier Gas Clean-up Large gas volume enough to compensate pressure fluctuation Mill Hopper N2 O2 Coal Utilizing high capability of GT load change rate (GT load change rate: approx. 20%/min) ASU Comp. GT ST Rapid gasification reaction by nearly pure oxygen supply Reasons of high load change rate GT leads the generation load Oxygen-blown gasifier rapidly follows the GT load change 21

23 Characteristics of Oxygen-blown IGCC Having high Load Change Rate The Potential of Oxygen-blown IGCC (2) Load change rate: 10%/min Generation output [MW] Gasifier load follows the generation output within 5minutes Gasifier load Gasifier pressure is controlled by the fuel (gasifier load) Gasifier pressure P±1% Achievement of high load change rate 10%/min GT leads the generation load Oxygen-blown gasifier rapidly follows the GT load change 22

24 Results of the Flexibility Improvement tests and Further Challenges 23 Item Results Further Challenges Load change rate Minimum load Start-up time 10%/min 0MW (net) (equivalent to isolated operation) within 8 hours (cold start-up mode) (prospect) Further improvement of load change rate AFC and GF operation (continuous load adjustment) Hot start-up mode test Prospect : several hours Very hot stat-up mode test Prospect : within an hour Continue to challenge for making the best of the potential of oxygenblown IGCC

25 Table of Contents 1. Project Background 2. Progress of Osaki CoolGen Project (1) Outline of Osaki CoolGen Project (2) Progress of the Step 1 Demonstration of Oxygen-blown IGCC (3) Progress of the Step 2 Demonstration of IGCC with CO2 capture 3. Challenges for Improving Flexibility 4. Goal of Osaki CoolGen Project 24

26 Goal of Osaki CoolGen Project Energy Mix Policy Wide range of coal varieties (from low grade to high grade coal) High efficiency Using low grade coal Energy Security Drastic reduction of CO2 emissions by high efficiency IGCC/IGFC with CCUS Economy Environmental conservation + Flexibility Safety Contribution to stable power grids Challenge for sustainable energy system development 25

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