AU2010203035B2 - Gasification method and gasification facility - Google Patents
Gasification method and gasification facility Download PDFInfo
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- AU2010203035B2 AU2010203035B2 AU2010203035A AU2010203035A AU2010203035B2 AU 2010203035 B2 AU2010203035 B2 AU 2010203035B2 AU 2010203035 A AU2010203035 A AU 2010203035A AU 2010203035 A AU2010203035 A AU 2010203035A AU 2010203035 B2 AU2010203035 B2 AU 2010203035B2
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- circulating particles
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- 238000002309 gasification Methods 0.000 title claims abstract description 180
- 238000000034 method Methods 0.000 title claims description 13
- 238000000197 pyrolysis Methods 0.000 claims abstract description 171
- 239000002245 particle Substances 0.000 claims abstract description 102
- 239000002994 raw material Substances 0.000 claims abstract description 83
- 238000002407 reforming Methods 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 151
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 239000000567 combustion gas Substances 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 25
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000005192 partition Methods 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 230000005764 inhibitory process Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
During movement of circulating particles (3) separated by a separator (11), the circulating particles (3) are mixed with a raw material (2) for pyrolysis of 5 volatile portions contained in the raw material (2) to take out a pyrolysis gas (19). Then, pyrolysis residue is fed to a gasification furnace (1) for production of a reformed gasification gas (21) through reforming gasification. 2343128_1 (GHMatters) 16/07/10 AIr I SOLID PARTICLES
Description
AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION Standard Patent Applicant (s): National Institute of Advanced Industrial Science and Technology, Central Research Institute of Electric Power Industry, Japan Coal Energy Center and IHI Corporation Invention Title: Gasification method and gasification facility The following statement is a full description of this invention, including the best method for performing it known to me/us: - 2 DESCRIPTION GASIFICATION METHOD AND GASIFICATION FACILITY Background Art The present invention relates to a gasification 5 method and a gasification facility capable of promoting a reforming gasification reaction through prevention of the reforming gasification reaction from being inhibited by a pyrolysis gas upon gasification of raw material in the gasification facility. 10 Recently some techniques have been proposed to produce a high-grade gasification gas through gasification of various organic raw materials such as biomass, coal, waste, oil residue and heavy oil. Fig. 1 shows a so-called two-tower type gasification 15 facility which is disclosed for example in JP 2005-41959A. In the gasification facility shown in Fig. 1, a raw material 2 fed to a fluidized bed gasification furnace 1 is fluidly heated and gasified into a gasification gas 6 through a fluidized bed 5 formed from circulating 20 particles 3 (sand or the like) fed at a high temperature of, e.g., 800 0 C or more and a gasifying agent 4 such as steam, air, oxygen or carbon dioxide fed from below. The gasification gas 6 produced in the gasification furnace 1 is guided to a separator 7 such as a cyclone for 25 removal of solid contents, and thereafter, via refining devices such as a tar remover and an electric dust collector, it is finally fed as fuel for a power generating facility or as synthesis-gas raw material or is compressed by a compressor into a liquefied gas product. 30 Unreacted char produced upon gasification of the raw material 2 in the gasification furnace 1 is fed together with the circulating particles 3 to a fluidized bed 23431281 (GHMatters) 16/07/10 - 3 combustion furnace 8 where the char is burned through feed of an oxidizing agent 9 such as air or oxygen to heat the circulating particles 3 up to a temperature of, e.g., 900 0 C or more. Combustion gas 10 discharged from the combustion 5 furnace 8 is guided to a separator 11 such as a cyclone for separation of the combustion gas into the circulating particles 3 and an exhaust gas 12. The circulating particles 3 separated are fed to the gasification furnace 1 through a down comer A immersed in the fluidized bed 5 10 while the exhaust gas 12 separated is guided to a stack via a heat exchanger 13 or the like for heat recovery and a dust collector such as a bag filter for dust collection. In the gasification furnace 1 where the raw material 2 is heated by the fluidized bed 5, a pyrolysis reaction 15 of producing a pyrolysis gas through pyrolysis coexists with a reforming gasification reaction of producing a reformed gasification gas from pyrolysis residue under the action of the gasifying agent 4. The pyrolysis reaction produces the pyrolysis gas containing methane CH 4 , 20 hydrocarbon CH such as tar and other gases such as carbon monoxide CO, carbon dioxide CO 2 and hydrogen H 2 whereas the reforming gasification reaction produces the reformed gasification gas comprising carbon monoxide CO and hydrogen H 2 in the case of steam gasification. 25 When the raw material 2 is fed to the gasification furnace 1, there first appears the pyrolysis gas due to pyrolysis and then appears the reformed gasification gas due to the reforming gasification under the action of the gasifying agent. The pyrolysis gas, however, contains a 30 lot of tar and hydrogen, with a result that the reforming gasification reaction may be disadvantageously inhibited by the pyrolysis gas produced through the pyrolysis reaction in the conventional gasification facility where the pyrolysis and reforming gasification reactions occur 35 concurrently in the gasification furnace 1 as set forth hereinabove. 2343128_1 (GHMatters) 16/07/10 - 4 A study report (Hayashi et al., Fuel, 2005; Volume 84: p. 1612) says that hydrogen and tar produced from an organic raw material through its pyrolysis reaction may act to inhibit an steam gasification reaction (carbon + 5 steam - carbon monoxide + hydrogen). Such inhibition of the reforming gasification reaction by the pyrolysis gas produced in the gasification furnace 1 of Fig. 1 may bring about problems that it takes much time for the raw material to be reformed-gasified and 10 that production volume of the reformed gasification gas is reduced. In order to overcome such reduction, reaction time may be kept longer to increase in production volume of the reformed gasification gas, which require however increase in volume of the gasification furnace 1 used, 15 disadvantageously resulting in the large-sized facility. A further problem may lie that the processing devices such as a tar remover require to be large-sized since the gasification gas 6 taken out from the gasification furnace 1 is an admixture of the reformed gasification gas with 20 the pyrolysis gas. The invention was conceived in view of the above and has its object to provide a gasification method and a gasification facility capable of promoting a reforming gasification reaction by prevention of the reforming 25 gasification reaction from being inhibited by a pyrolysis gas upon gasification of a raw material in the gasification facility. Summary of Invention The invention is directed to a gasification method 30 for a gasification facility comprising a gasification furnace for gasifying a raw material in the presence of circulating particles and a gasifying agent, pyrolysis residue produced by pyrolyzing the raw material in a pyrolysis apparatus being fed to said gasification 4221314_1 (GHMatters) P84614.AU 23/04/13 - 5 furnace, and a combustion furnace for heating the circulating particles through introduction and combustion of char produced upon gasification in the gasification furnace, a combustion gas from the combustion furnace 5 being guided to a separator for separation of the combustion gas into an exhaust gas and the circulating particles, said circulating particles being returned to said gasification furnace, wherein, during movement of the circulating particles separated by the separator, said 10 circulating particles are mixed with the raw material for pyrolysis of the raw material to take out a pyrolysis gas, and thereafter the pyrolysis residue produced by the pyrolysis of the raw material is fed to the gasification furnace for production of a reformed gasification gas 15 through reforming gasification. By the above, the following effects and advantages can be obtained. During the movement of the circulating particles separated by the separator, the circulating particles are 20 mixed with the raw material for pyrolysis of the raw material within a limited time to take out the pyrolysis gas; then, the pyrolysis residue separated from the pyrolysis gas by the pyrolysis is fed to the gasification furnace for production of the reformed gasification gas 25 through the reforming gasification. This prevents the pyrolysis gas from being produced in the gasification furnace, so that the reforming gasification reaction is prevented from being inhibited by the pyrolysis gas in the gasification furnace. 30 Since the pyrolysis is performed within the pyrolysis time of 0.3 to 10 seconds to preliminarily produce only the pyrolysis gas, the pyrolysis gas arising from the pyrolysis and the reformed gasification gas arising from the reforming gasification can be effectively taken out 35 separately. 4221314_1 (GHMatters) P84614.AU 23/04/13 - 6 The invention is also directed to a gasification facility comprising a gasification furnace for gasifying a raw material in the presence of circulating particles and a gasifying agent, pyrolysis residue produced by 5 pyrolyzing the raw material in a pyrolysis apparatus being fed to said gasification furnace, and a combustion furnace for heating the circulating particles through introduction and combustion of char produced upon gasification in the gasification furnace, a combustion gas from the combustion 10 furnace being guided to a separator for separation of the combustion gas into an exhaust gas and the circulating particles, said circulating particles being returned to the gasification furnace, wherein it comprises a pyrolysis apparatus for pyrolysis of the raw material fed from a raw 15 material feeder during movement of the circulating particles separated by the separator in a particle travel part, resultant pyrolysis gas being taken out through a pyrolysis gas outlet, resultant pyrolysis residue being fed to the gasifying furnace to take out a reformed 20 gasification gas. According to the above-mentioned gasification facility, the raw material is fed to the pyrolysis apparatus to take out the pyrolysis gas produced through the pyrolysis, and thereafter the pyrolysis residue is fed 25 to the gasification furnace for production of the reformed gasification gas through the reforming gasification. Thus, the gasification facility is provided which can prevent the reforming gasification reaction in the gasification furnace from being inhibited by the pyrolysis 30 gas. In the gasification facility, the pyrolysis apparatus preferably comprises the particle travel part comprising an upper down comer through which flow down the circulating particles separated by the separator, an 35 inclined pipe extending aslant upward from a lower end of the upper down comer and a lower down comer through which 4221314_1 (GHMatters) P84614.AU 23/04/13 - 6A flow down the circulating particles from an upper end of the inclined pipe into the gasification furnace; and the raw material feeder for feeding the raw material to intermediately of the inclined pipe between the upper and 5 lower ends thereof. 4221314_1 (GHMatters) P84614.AU 23/04/13 - 7 In the gasification facility, the pyrolysis apparatus preferably comprises the particle travel part comprising an upper down comer through which flow down the circulating particles separated by the separator, an 5 overflow device surrounding a lower end of the upper down comer to fluidize the circulating particles for overflow by a fluidizing gas and a lower down comer allowing the circulating particles from the overflow device to flow down into the gasification furnace; and the raw material 10 feeder for feeding the raw material to the overflow device or intermediately of the lower down comer. In the gasification facility, the pyrolysis apparatus preferably comprises the particle travel part comprising an upper down comer through which flow down the 15 circulating particles separated by the separator, an upper overflow device surrounding a lower end of the upper down comer to fluidize the circulating particles for overflow by a fluidizing gas, an intermediate down comer allowing the circulating particles overflowing from the upper 20 overflow device to flow down therethrough, a lower overflow device surrounding a lower end of the intermediate down comer to fluidize the circulating particles for overflow by the fluidizing gas and a lower down comer causing the circulating particles overflowing 25 from the lower overflow device to flow into the gasification furnace; and the raw material feeder for feeding the raw material to the upper overflow device or intermediately of the intermediate down comer, at least one of the upper and lower overflow devices being provided 30 with a pyrolysis gas outlet. In the gasification facility, it is preferable that the pyrolysis apparatus further comprises a gas introducer, a gas introduced through said gas introducer being an ascending-flow forming gas. 2343128_1 (GHMattere) 16/07/10 - 8 In the gasification facility, the ascending-flow forming gas is preferably a gasifying agent. According to the gasification method and gasification apparatus of the invention, during the movement of the 5 circulating particles separated by the separator, the circulating particles are mixed with the raw material so that the pyrolysis of the raw material is substantially completed within a limited time to take out the pyrolysis gas. Then, the pyrolysis residue is fed to the 10 gasification furnace to produce a reformed gasification gas through the reforming gasification. Thus, the pyrolysis gas is prevented from appearing in the gasification furnace, obviating a problem that the reforming gasification reaction in the gasification 15 furnace is inhibited by the pyrolysis gas. As a consequence, obtained is a superior effect of accelerating the reforming gasification reaction in the gasification furnace to increase a production volume of reformed gasification gas. 20 Since the pyrolysis is performed within the pyrolysis time of 0.3 to 10 seconds to preliminarily produce the pyrolysis gas only, the pyrolysis gas arising from the pyrolysis and the reformed gasification gas arising from the reforming gasification can be effectively taken out 25 separately. As a result, post-processes such as refining of the pyrolysis gas and reformed gasification gas are ensured in their respective preferred manners. A reformed gasification gas may be alternatively produced by reforming the pyrolysis gas from the pyrolysis apparatus. 30 An embodiment of the invention will be described with reference to the accompanying drawings. 2343128_1 (GMatters) 16/07/10 -9 Brief Description of Drawings Fig. 1 is a schematic diagram for showing a conventional gasification facility; Fig. 2 is a schematic diagram for showing an 5 embodiment of a gasification facility of the invention; Fig. 3 is a schematic side view for showing a specific example of a pyrolysis apparatus in the gasification facility shown in Fig. 2; Fig. 4 is a schematic side view for showing another 10 specific example of the pyrolysis apparatus in the gasification facility shown in Fig. 2; and Fig. 5 is a schematic side view for showing a further specific example of the pyrolysis apparatus in the gasification facility shown in Fig. 2. 15 Description of Embodiment Fig. 2 shows an embodiment of the invention applied to the gasification facility shown in Fig. 1, where a pyrolysis apparatus generally designated at 14 is arranged 20 between a separator 11 and a fluidized bed gasification furnace 1. The pyrolysis apparatus 14 comprises a particle travel part 15 through which circulating particles 3 separated by the separator 11 are moved. During the movement, the circulating particles 3 are fed 25 with a raw material 2 from a raw material feeder 16 for pyrolysis of the raw material 2 and are fed with an ascending-flow forming gas 18 from a gas introducer 17 for ascension of resultant pyrolysis gas, so that pyrolysis residue remaining is guided together with the circulating 30 particles 3 to the gasification furnace 1. The pyrolysis apparatus 14 is further provided with a pyrolysis gas outlet 20 for the pyrolysis gas 19. In Fig. 2, the 2343128_1 (GHMattere) 16/07/10 - 10 ascending-flow forming gas 18 is fed by the gas introducer 17 to the particle travel part 15 of the pyrolysis apparatus 14; however, the gas 18 may not be fed thereto. Specifically, since the circulating particles 3 separated 5 by the separator 11 are fed to the gasification furnace 1 while being sealed up by the down comer A immersed in the fluidized bed 5 as shown in Fig. 2, the pyrolysis gas 19 produced in the down comer A can ascend by its own pressure for taking-out through the outlet 20. 10 As described above, the pyrolysis residue remaining after the completion of pyrolysis by the pyrolysis apparatus 14 is guided to the gasification furnace 1. Thus, little or no pyrolysis gas appears in the gasification furnace 1, with a result that a reforming 15 gasification reaction is satisfactorily performed with no substantial inhibition by the pyrolysis gas, thus taking out a larger volume of reformed gasification gas 21 from the gasification furnace 1. Fig. 3 shows, by way of example, a specific 20 configuration of the pyrolysis apparatus 14. The pyrolysis apparatus 14 comprises a particle travel part 15 comprising an upper down comer 22 through which flow down the circulating particles 3 separated by the separator 11, an inclined pipe 23 extending aslant upwardly from a lower 25 end of the upper down comer 22 and a lower down comer 24 through which flow down the circulating particles 3 from an upper end of the inclined pipe 23 into the gasification furnace 1. The pyrolysis apparatus 14 further comprises a raw material feeder 16 for feed of the raw material 2 to 30 intermediately of the inclined pipe 23 between the upper and lower ends thereof and a gas introducer 17 for feed of the ascending-flow forming gas 18 from below into the inclined pipe 23. In the example of Fig. 3, a distribution plate 25 is provided through which the 35 ascending-flow forming gas 18 is blown from below into the inclined pipe 23 to fluidize the circulating particles. 2343128_1 (GHMatters) 16/07/10 - 11 The ascending-flow forming gas 18 may be of any type as long as it has no adverse effect on the production of and subsequent refining of the pyrolysis gas 19; it may be, for example, a gasifying agent such as steam for use in 5 gasification of the raw material 2. The raw material feeder 16 may be, for example, a screw feeder capable of feeding the raw material 2 irrespective of an internal pressure of the inclined pipe 23. The inclined pipe 23 may be fed at a plurality of 10 sites thereof with the raw material 2 from the raw material feeder 16. The inclined pipe 23 is provided at its upper end with a pyrolysis gas outlet 20 which opens to the upper end of the lower down comer 24 to take out the pyrolysis 15 gas 19, thereby allowing the pyrolysis gas 19 taken out through the outlet 20 to be guided to a separator 26 such as the cyclone for removal of solid particles and thereafter to succeeding parts. Mode of operation of the example shown in Fig. 3 will 20 be described. The circulating particles 3 separated by the separator 11 flow down through the upper down comer 22 into the lower end of the inclined pipe 23 extending aslant upward therefrom. The circulating particles 3 fed 25 to the inclined pipe 23 are fluidized by the action of the ascending-flow forming gas 18 from the gas introducer 17 via the distribution plate 25. At that time, an interior of the upper down comer 22 is occupied by the falling circulating particles 3, with a result that the 30 circulating particles 3 are caused to move upward through the inclined pipe 23 and thereafter flow into the lower down comer 24 through the upper end thereof. Similarly, the ascending-flow forming gas 18 moves upward through the inclined pipe 23 and then exits through the outlet 20. 2343128_1 (GHMatters) 16/07/10 - 12 When the inclined pipe 23 is fed with the raw material 2 by the raw material feeder 16 in such a state, the raw material 2 is mixed and heated with the circulating particles 3 in the inclined pipe 23 for 5 pyrolysis. The pyrolysis gas 19 appearing as a result of the pyrolysis is moved upward together with the ascending flow forming gas 18 through the inclined pipe 23 and taken out through the outlet 20. The pyrolysis time of the raw material 2 may be 10 controlled, on the basis of a predetermined length between a setting position of the raw material feeder 16 on the inclined pipe 23 and the upper end of the inclined pipe 23, by regulating a pressure of the ascending-flow forming gas 18 fed from the gas introducer 17. Thus, when the raw 15 material 2 is subjected to the pyrolysis with feed of the circulating particles 3 of 800 0 C or more as described above, the pyrolysis time may be controlled so that the pyrolysis is performed within a limited time of 0.3 to 10 seconds. Thereby, the pyrolysis reaction may come to a 20 substantial completion. It was experimentally ascertained that, if the pyrolysis time is less than 0.3 seconds, insufficient pyrolysis may result; if it exceeds 10 seconds, inactivation of char produced from the raw material 2 may progress. 25 Accordingly, since the gasification furnace 1 is fed with the pyrolysis residue remaining after the substantial completion of the pyrolysis in the pyrolysis apparatus 14, little or no pyrolysis gas is produced in the gasification furnace 1, thereby ensuring a satisfactory reforming 30 gasification reaction with no substantial inhibition by the pyrolysis gas, so that a larger volume of high-grade reformed gasification gas 21 can be successfully taken out from the gasification furnace 1. Fig. 4 shows, by way of example, another specific 35 configuration of the pyrolysis apparatus 14. The 2343128_1 (GHMatters) 16/07/10 - 13 pyrolysis apparatus 14 comprises a particle travel part 15 comprising an upper down comer 22 through which flow down the circulating particles 3 separated by the separator 11, an overflow device 30 surrounding a lower end of the upper 5 down comer 22 to fluidized the circulating particles 3 by feeding a fluidizing gas 28 through a distribution plate 27 to thereby cause a certain amount of circulating particles 3 to overflow at an upper end of a one-sided partition plate 29 and a lower down comer 24 causing the 10 circulating particles 3 from the overflow device 30 to flow down into the gasification furnace 1. The pyrolysis apparatus 14 further comprises a raw material feeder 16 for feed of the raw material 2 to intermediately of the lower down comer 24 and a gas introducer 17 for feed of 15 the ascending-flow forming gas 18 to the lower down comer 24 at a position lower than the raw material feeder 16. In the example of Fig. 4, the gas introducer 17 blows the ascending-flow forming gas 18 circumferentially into the lower down comer 24. Similarly, the raw material feeder 20 16 may feed the raw material 2 circumferentially into the lower down comer 24. The gas introducer 17 may not be provided since the lower down comer 24 is immersed in the fluidized bed 5 just like the down comer A shown in Fig. 2 so that the pyrolysis gas 19 produced in the lower down 25 comer 24 can ascend by its own pressure for taking-out from the outlet 20. In the Fig. 4 example, the circulating particles 3 separated by the separator 11 flow down through the upper down comer 22 for feed to the overflow device 30. By the 30 action of the fluidizing gas 28 fed to the overflow device 30, the circulating particles 3 become fluidized to overflow at the upper end of the one-sided partition plate 29 into the gasification furnace 1 via the lower down comer 24. Due to a higher internal pressure of the 35 gasification furnace 1, the ascending-flow forming gas 18 fed to the lower down comer 24 by the gas introducer 17 2343128_1 (GHMatters) 16/07/10 - 14 ascends through the lower down comer 24 to discharge through the outlet 20. When the raw material 2 is fed from the raw material feeder 16 to the lower down comer 24 in such a state, the 5 raw material 2 is mixed and heated with the circulating particles 3 for pyrolysis during its flowing-down through the lower down comer 24. The pyrolysis gas 19 produced by the pyrolysis ascends together with the ascending-flow forming gas 18 through the lower down comer 24 to 10 discharge through the outlet 20. As mentioned in the above, the blowing-in of the ascending-flow forming gas 18 prevents the pyrolysis gas 19 from being entrained by the circulating particles 3 and the pyrolysis residue into the gasification furnace 1. 15 The pyrolysis time of the raw material 2 may be controlled, on the basis of a predetermined length of a setting position of the raw material feeder 16 on the lower down comer 24 and a blowing-in position of the ascending-flow forming gas 18 from the gas introducer 17, 20 by regulating a pressure of the ascending-flow forming gas 18 blown from the gas introducer 17. As a result, when the raw material 2 is subjected to the pyrolysis with the feed of the circulating particles 3 of 800 0 C or more as described above, the pyrolysis time may be controlled so 25 that the pyrolysis is performed within a limited time of 0.3 to 10 seconds. Thereby, the pyrolysis reaction may come to a substantial completion. Accordingly, since the gasification furnace 1 is fed with the pyrolysis residue remaining after the substantial 30 completion of the pyrolysis in the pyrolysis apparatus 14, little or no thermal decomposition gas is produced in the gasification furnace 1, thereby ensuring a satisfactory reforming gasification reaction with no substantial inhibition by the pyrolysis gas, so that a larger volume 2343128_1 (GHMatters) 16/07/10 - 15 of high-grade reformed gasification gas 21 can be successfully taken out from the gasification furnace 1. Fig. 5 shows, by way of example, a further specific configuration of the pyrolysis apparatus 14. The 5 pyrolysis apparatus 14 comprises a particle travel part 15 comprising an upper down comer 22 through which flow down the circulating particles 3 separated by the separator 11, an upper overflow device generally designated at 31 surrounding a lower end of the upper down comer 22 to 10 fluidize the circulating particles 3 by feeding a fluidizing gas 28 via a distribution plate 27 to thereby cause a certain amount of circulating particles 3 to overflow at the upper end of a one-sided partition plate 29; an intermediate down comer 32 causing the circulating 15 particles 3 to overflow from the upper overflow device 31 to flow down therethrough; a lower overflow device generally designated at 33 surrounding a lower end of the intermediate down comer 32 to fluidize the circulating particles 3 by feeding the fluidizing gas 28 via a 20 distribution plate 27 to thereby cause a certain amount of circulating particles 3 to overflow at an upper end of a one-sided partition plate 29; and a lower down comer 24 for guiding the circulating particles 3 overflowing from the lower overflow device 33 to the gasification furnace 25 1. The pyrolysis apparatus 14 further comprises a raw material feeder 16 for feed of the raw material 2 to intermediately of the intermediate down comer 32. In the example of Fig. 5, each of the upper and lower overflow devices 31 and 33 is provided with the outlet 20 for 30 taking out the pyrolysis gas 19. The pyrolysis gas outlet 20 may be provided on either the upper overflow device 31 or the lower overflow device 33. A gas introducer 17 for feed of an ascending-flow forming gas 18 may be arranged on the intermediate down comer 32 at a position lower than 35 the raw material feeder 16. 23431281 (CHMatters) 16/07/10 - 16 In the example of Fig. 5, the circulating particles 3 separated by the separator 11 flow down through the upper down comer 22 into the upper overflow device 31. By the action of the fluidizing gas 28 fed to the upper overflow 5 device 31, the circulating particles 3 become fluidized and overflow at the upper end of the one-sided partition plate 29 into the lower overflow device 33 through the intermediate down comer 32. Since the lower overflow device 33 is fed with the fluidizing gas 28, the 10 circulating particles 3 become fluidized and overflow at the upper end of the one-sided partition plate 29 to be guide into the gasification furnace 1. The fluidizing gas 28 fed to the upper overflow device 31 and the lower overflow device 33 discharges from their respective 15 outlets 20. When the raw material 2 is fed from the raw material feeder 16 to the intermediate down comer 32 in such a state, the raw material 2 is mixed and heated with the circulating particles 3 for pyrolysis during its flowing 20 down through the intermediate down comer 32 and during its flowing in the lower overflow device 33. The pyrolysis gas 19 produced by the pyrolysis discharges through the outlet 20. Pyrolysis time of the raw material 2 may be 25 controlled by selecting a setting position of the raw material feeder 16 on the intermediate down comer 32. Thus, when the raw material 2 is subjected to the pyrolysis with the circulating particles 3 fed at 800 0 C or more as described above, the pyrolysis time may be 30 controlled so that the pyrolysis is performed within a limited time of 0.3 to 10 seconds. Thereby, the pyrolysis reaction may come to a substantial completion. Accordingly, since the gasification furnace 1 is fed with the pyrolysis residue remaining after the substantial 35 completion of the pyrolysis in the pyrolysis apparatus 14, 2343128_1 (GHMatters) 16/07/10 - 17 little or no pyrolysis gas is produced within the gasification furnace 1, thereby ensuring a satisfactory reforming gasification reaction with no substantial inhibition by the pyrolysis gas so that a larger volume of 5 high-grade reformed gasification gas 21 can be successfully taken out from the gasification furnace 1. As set forth hereinabove, in the pyrolysis apparatus 14, the pyrolysis of the raw material may be substantially completed within the limited time to produce the pyrolysis 10 gas 19, and thereafter the resultant pyrolysis residue may be fed to the gasification furnace 1 to produce the reformed gasification gas 21 through the reforming gasification, thereby enabling the pyrolysis gas 19 and the reformed gasification gas 21 to be effectively taken 15 out separately, thus ensuring the effective execution of post-processing such as refining of the pyrolysis gas 19 and the reformed gasification gas 21 in their respective preferred manners. The reformed gasification gas may be alternatively produced by reforming the pyrolysis gas 19 20 taken out from the pyrolysis apparatus 14. It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia 25 or any other country. In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as 30 "comprises" or "comprising" is used in an inclusive sense, i.e., to specify the presence of the stated features but not to preclude the presence of addition of further features in various embodiments of the invention. 2343128_1 (GHMattere) 16/07/10
Claims (10)
1. A gasification method for a gasification facility comprising a gasification furnace for gasifying a raw material in the presence of circulating particles and a 5 gasifying agent, pyrolysis residue produced by pyrolyzing the raw material in a pyrolysis apparatus being fed to said gasification furnace, and a combustion furnace for heating the circulating particles through introduction and combustion of char produced upon gasification in the 10 gasification furnace, a combustion gas from the combustion furnace being guided to a separator for separation of the combustion gas into an exhaust gas and the circulating particles, said circulating particles being returned to said gasification furnace, wherein, during movement of the 15 circulating particles separated by the separator, said circulating particles are mixed with the raw material for pyrolysis of the raw material to take out a pyrolysis gas, and thereafter the pyrolysis residue produced by the pyrolysis of the raw material is fed to the gasification 20 furnace for production of a reformed gasification gas through reforming gasification.
2. A gasification method as claimed in claim 1, wherein pyrolysis time is 0.3 to 10 seconds.
3. A gasification facility comprising a gasification 25 furnace for gasifying a raw material in the presence of circulating particles and a gasifying agent, pyrolysis residue produced by pyrolyzing the raw material in a pyrolysis apparatus being fed to said gasification furnace, and a combustion furnace for heating the 30 circulating particles through introduction and combustion of char produced upon gasification in the gasification furnace, a combustion gas from the combustion furnace being guided to a separator for separation of the combustion gas into an exhaust gas and the circulating 35 particles, said circulating particles being returned to 4221314_1 (GHMatters) P84614.AU 23/04/13 - 19 the gasification furnace, wherein it comprises a pyrolysis apparatus for pyrolysis of the raw material fed from a raw material feeder during movement of the circulating particles separated by the separator in a particle travel 5 part, resultant pyrolysis gas being taken out through a pyrolysis gas outlet, resultant pyrolysis residue being fed to the gasifying furnace to take out a reformed gasification gas.
4. A gasification facility as claimed in claim 3, 10 wherein pyrolysis apparatus comprises the particle travel part comprising an upper down comer through which flow down the circulating particles separated by the separator, an inclined pipe extending aslant upward from a lower end of the upper down comer and a lower down comer through 15 which flow down the circulating particles from an upper end of the inclined pipe into the gasification furnace; and the raw material feeder for feeding the raw material to intermediately of the inclined pipe between the upper and lower ends thereof. 20
5. A gasification facility as claimed in claim 3, wherein pyrolysis apparatus comprises the particle travel part comprising an upper down comer through which flow down the circulating particles separated by the separator, an overflow device surrounding a lower end of the upper 25 down comer to fluidize the circulating particles for overflow by a fluidizing gas and a lower down comer allowing the circulating particles from the overflow device to flow down into the gasification furnace; and the raw material feeder for feeding the raw material to the 30 overflow device or intermediately of the lower down comer.
6. A gasification facility as claimed in claim 3, wherein pyrolysis apparatus comprises the particle travel part comprising an upper down comer through which flow down the circulating particles separated by the separator, 35 an upper overflow device surrounding a lower end of the 4221314_1 (GHMatters) P84614.AU 23/04/13 - 20 upper down comer to fluidize the circulating particles for overflow by a fluidizing gas, an intermediate down comer allowing the circulating particles overflowing from the upper overflow device to flow down therethrough, a lower 5 overflow device surrounding a lower end of the intermediate down comer to fluidize the circulating particles for overflow by the fluidizing gas and a lower down comer causing the circulating particles overflowing from the lower overflow device to flow into the 10 gasification furnace; and the raw material feeder for feeding the raw material to the upper overflow device or intermediately of the intermediate down comer, at least one of the upper and lower overflow devices being provided with a pyrolysis gas outlet. 15
7. A gasification facility as claimed in any one of claims 3-6, wherein the pyrolysis apparatus further comprises a gas introducer, a gas introduced through said gas introducer being a ascending-flow forming gas.
8. A gasification facility as claimed in claim 7, 20 wherein said ascending-flow forming gas is a gasifying agent.
9. A gasification method substantially as herein described with reference to accompanying Figures 2 to 5.
10. A gasification facility substantially as herein 25 described with reference to accompanying Figures 2 to 5. 4221314_1 (GHMatters) P84614.AU 23/04/13
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009172381A JP5624738B2 (en) | 2009-07-23 | 2009-07-23 | Gasification equipment |
| JP2009-172381 | 2009-07-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2010203035A1 AU2010203035A1 (en) | 2011-02-10 |
| AU2010203035B2 true AU2010203035B2 (en) | 2013-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2010203035A Ceased AU2010203035B2 (en) | 2009-07-23 | 2010-07-16 | Gasification method and gasification facility |
Country Status (2)
| Country | Link |
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| JP (1) | JP5624738B2 (en) |
| AU (1) | AU2010203035B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007112873A (en) * | 2005-10-19 | 2007-05-10 | Ishikawajima Harima Heavy Ind Co Ltd | Method and system for gasification of gasification fuel |
| JP5057466B2 (en) * | 2007-05-08 | 2012-10-24 | 独立行政法人産業技術総合研究所 | Method for generating combustible gas and gasification reactor therefor |
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- 2009-07-23 JP JP2009172381A patent/JP5624738B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| AU2010203035A1 (en) | 2011-02-10 |
| JP2011026413A (en) | 2011-02-10 |
| JP5624738B2 (en) | 2014-11-12 |
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