微粉炭燃焼技術の開発 - 株式会社IHI

1 Advanced Development of Pulverized Coal Firing Technologies .. IHI has been developing combustion technologies which give very low environmental impact. Various equipment and numerical tools support the development process at each stage. Small- and large-scale test furnaces are used for evaluating actual combustion behaviour. Numerical simulation is also used to assist theoretical understanding. An example of recent development is the realization of very low Air/Coal ratio burners for dried lignite coal firing. Another commercialized burner made it possible to reduce slagging when burning coals which have a low ash melting temperature, such as sub-bituminous coals.

2 The dynamic and static performance of pulverizers, which play a very important role in fuel burning process as pulverized fuel size dominates burnout behaviour, has been improved. This paper gives an outline of recent development of combustion technologies. A large- scale coal combustion test facility which is under construction is also described.. 1.. NOx .. PIT CFT .. ( CO2 ) . CO2 ( cctf Coal Combustion Test Facility ) . CO2 CCS . ( Carbon Capture and Storage ) . CO2 . CO2 .. 2.. 30 IHI ( 2011 ).. A-DF . (1).. 2 . DF 20 . 20 A-DF .. A/C Air/Coal 1 . 2. 2 A/C .. ( 2 ) ( 3 ). 40. 2. 1 A-DF 60 .. 50 . 60 wt.

3 10 . 40 .. 1 IHI-DF DF . A-DF . Advanced DF DF A/C . 2 .. 3 A/C .. A-DF . 2 IHI-DF . A-DF .. DF . *1 . NOx (a) IHI-DF (b) A-DF 0 5 10 15 20 25 30. ( min ). *1 . 1 DF A-DF 2 . Fig. 1 Comparison of DF burner and Advanced-DF burner Fig. 2 Temperature trend of slugging probe surface IHI ( 2011 ) 31. 1 + . 2 3.. CO2 . 3 .. 3 A/C . Fig. 3 Conceptual diagram of very low A/C burner .. A/C . 3. 1 . 4 mm .. 5 NOx .. NOx . 50 .. (a) (b) .. HGI ( Hardgrove Grindability Index ) 3 . 6. 2 HGI 60 . 14 10 . HGI . 6 . 4 A/C . Fig. 4 Flame photograph of very low A/C burner 1 . 7 . 100.. 98 1 . NOx . 35 .. 96. 3. 2 .. 94.

4 ( 4 ) ( 5 ) . 92 . NOx . 5 cal . 90 CO2 . 50 60 70 80 90 100.. 5 A/C NOx . Fig. 5 Behaviour of NOx and combustion efficiency using very low A/C burner .. 32 IHI ( 2011 ). (a) HGI 60 .. 14 .. 10 . 0 200 400 600 800 1 000. ( t/h ) ( kg/h ). 8 . (b) HGI 35 . Fig. 8 Increase of pulverizing capacity of woody biomass pulverizing . 14 . 30 .. 19 .. 4. 1 .. ( t/h ).. 6 . Fig. 6 Increase of pulverizing capacity by high-speed table rotation . ( 6 ) . 1 FLUENT . ( t/h ).. (1 1/e ).. 9 . 14:52 15:00 15:07 15:14 15:21 15:28 15:36 15:43 15:50 . ( h:min ).. e . 1 . 7 . Fig. 7 Measurement result of pulverizer response for step load change 10 10 - ( a ).

5 - ( b ) .. (a) (b) .. 8 2 .. 4.. + 1 .. 9 . Fig. 9 Conceptual diagram of analytical method IHI ( 2011 ) 33. (a) (b) 2 2.. 1 700 . 1 600. 1 500 4. 2 . 1 400. 1 300 . 1 200. 1 100 . 1 000. 900. 800.. 700. 600 . 500. 400 . 300. 200 STAR-CD . 100 .. 10 .. Fig. 10 Gas temperature magnitude 12 .. 2 10 -3. kg/s .. 2 . 5.. cctf 2011. 5 cctf . 11 . 11 . - ( a ) . 11 - ( b ) CO2 . cctf 1 . 13 . cctf . (a) .. 100. 90. 80. 70. 60. 50 (b) . 40. 30. 20.. 10.. 0 . 11 12 . Fig. 11 Pulverized coal particle trajectory coloured by burnout level Fig. 12 Pulverized coal particle trajectory in roller mill 34 IHI ( 2011 ). 1 cctf .

6 Table 1 cctf equipment .. DTF 1 g/min *1 SCR .. PIT 150 kg/h *1.. CFT t/h *1 cctf 3 t/h *1.. CFD .. DTF Drop Tube Furnace PIT Perpendicular Industrial Combustion Test Furnace 13 cctf CFT Demonstration Combustion Test Furnace Fig. 13 Bird's-eye view of cctf cctf Coal Combustion Test Facility CFD Computational Fluid Dynamics SCR . *1 .. 14 . Fig. 14 Development process of combustion technologies .. cctf cctf cctf .. cctf . cctf .. 14 .. 6.. Drop Tube Furnace ( DTF ) .. DTF .. 150 kg/h ( PIT ) .. ( CFT ) . IHI ( 2011 ) 35. 1 2008 3 pp. 32 37.. ( 4 ) . ( 1 ) ( 13 ) . Vol. 86 No. 10 2007 10 Vol. 56 No. 2 2005 2 pp.

7 134 138. pp. 822 827 ( 5 ) . ( 2 ) RIECHELMANN Dirk . 44 6 2004 11 pp. 384 389. 44 3 ( 6 ) T. Tanaka, S. Watanabe, M. Tamura A Study on 2004 5 pp. 199 208 the Analytical Method for Boiler Linked with Burner ( 3 ) Flow-Pattern 6th Asia-Pacif ic Conference on IHI 48 Combustion Nagoya Japan ( ) pp. 20 23. 36 IHI ( 2011 ).