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1. 发明专利

JPH05240410A 失效
公开(公告)号：JPH05240410A
公开(公告)日：1993-09-17
申请号：JP15478592
申请日：1992-06-15
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： AZUHATA SHIGERU , NARATO KIYOSHI , ARASHI NORIO , INADA TORU , SOMA KENICHI , OTSUKA KEIZO , HISHINUMA TAKAO
IPC分类号： F23C99/00 , F23D1/00 , F23C11/00
摘要： PURPOSE:To enhance an effect of suppressing the generation of NOx by jetting a fuel-air mixed gas containing pulverized coal from a burner, jetting secondary air and tertiary air concentrically from the outer periphery of the burner and forming a primary combustion region and a secondary combustion region to reduce NOx. CONSTITUTION:The subject burner for combustion of pulverized coal comprises pulverized coal nozzles 12, 13 adapted to feed a fuel-air mixed gas composed of pulverized coal and primary air, and secondary and tertiary air nozzles 17, 18. A primary combustion region 21 where combustion is performed with the fuel-air mixed gas and the secondary air in the amount of air for combustion less than a theoretical amount of air is formed in the vicinity of the forward end of the burner, and a secondary combustion region 22 where further combustion of the combustion products from the primary combustion region 21 by tertiary air is formed in the wake of the primary combustion region 21. After ammonia compounds and cyanic compounds have been produced from the N content in coal in addition to NOx in the primary combustion region 21, these nitrified compounds are allowed to react with the combustion gas in the secondary combustion region on reduce NOx. The pulverized coal nozzles 13 are arranged in the outer periphery of the tertiary air nozzles 18.

2. 发明专利

JPH04214102A PULVERIZED COAL BOILER, PULVERIZED COAL BOILER SYSTEM, AND PULVERIZED COAL BURNER 失效
公开(公告)号：JPH04214102A
公开(公告)日：1992-08-05
申请号：JP4157191
申请日：1991-03-07
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： KOBAYASHI YOSHINOBU , AZUHATA SHIGERU , MIYADERA HIROSHI , KONO TAKESHI , MORITA SHIGEKI , JINBO TADASHI , HODOZUKA KUNIO , BABA AKIRA , KURAMASU KIMIHARU
IPC分类号： F23C99/00 , F23D1/00
摘要： PURPOSE:To provide a burner structure and a boiler system in which the burner structure and the boiler system are especially suitable for reducing the generation of NOx CONSTITUTION:In a boiler system in which a pulverized coal burner is provided on the side wall of a fire furnace, a burner is constituted so as to distribute the pulverized coal concentration in the mixture flow of the pulverized coal blown out of a pulverized coal blow-out port and the primary air higher in the outside and lower in the center of the mixture flow. The reduction area of NOx can be extended and NOx can be reduced by blowing out the pulverized coal with a distribution of its concentration. The easiness of ignition can be improved and the combustion efficiency at a low load can be improved.

3. 发明专利

JPH01272940A POWDER SUPPLY AMOUNT CONTROLLER 失效
公开(公告)号：JPH01272940A
公开(公告)日：1989-10-31
申请号：JP10165888
申请日：1988-04-25
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： KOBAYASHI YOSHINOBU , AZUHATA SHIGERU , NARATO KIYOSHI , MASUTANI MASAO , ARASHI NORIO , MORITA SHIGEKI
IPC分类号： G01N15/06
摘要： PURPOSE:To evaluate a difference in the particle concentration of the powder in a high-concentration supply pipe and to remove a measurement error by providing a detection pipe for taking part of powder within a prescribed concentration range out of piping and returning it to the piping after light transmission is detected. CONSTITUTION:The pulverized coal supply amounts of plural pulverized coal supply pipes 100a-100c are varied by opening/closing valves 101a-101c, and irregular particle concentration distributions generated in the supply pipes 100 are uniformed by particle concentration uniforming devices 102a-102c. Then detection pipes 103a-103c sample part of particles in the supply pipes 100 and particle concentration meters 106a-106c as detecting means detect the particle concentration. A signal processor 107 calculates the ratios of the intensity values of light photodetected by detectors 105a-105c to the intensity values of incident light from projectors 104a-104c. Then the intensity ratios are compared 108 and an opening extent regulator 109 adjusts the opening/closing valves 101 to equalize the intensity ratios of the respective pipes.

4. 发明专利

JPS6470609A LOW NITROGEN OXIDE BURNER FOR FINE POWDER COAL 失效
公开(公告)号：JPS6470609A
公开(公告)日：1989-03-16
申请号：JP22775787
申请日：1987-09-11
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： NARATO KIYOSHI , AZUHATA SHIGERU , KOBAYASHI YOSHINOBU , SOMA KENICHI , INADA TORU , ARASHI NORIO , IWAI YASUO , MASAI TADAHISA
IPC分类号： F23C99/00 , F23D1/00
摘要： PURPOSE:To provide a high efficiency and a low nitrogen oxidation by a method wherein a burner is composed of a fuel nozzle, a polygonal secondary air nozzle and a cylindrical third air nozzle, and the secondary and third airs are injected as a circulating flow. CONSTITUTION:A fine powder coal flow passage 11 is formed of a cylindrical unit, a secondary air passage 12 is formed in a polygonal shape so as to enclose the fine powder coal flow passage 11 and its secondary air injection port is of a polygonal reducer 15, respectively. The third air flow passage 13 is formed of a cylindrical shape so as to enclose the secondary air flow passage 12. A spacer 18 for delaying mixing the secondary air and the third air is arranged between the secondary air flow passage 12 and the third air flow passage 13 so as to elongate the outer pipe of the third air flow passage 13.

5. 发明专利

JPS63226513A ATOMIZER 失效
公开(公告)号：JPS63226513A
公开(公告)日：1988-09-21
申请号：JP1255087
申请日：1987-01-23
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： KOBAYASHI YOSHINOBU , AZUHATA SHIGERU , NARATO KIYOSHI , INADA TORU , SOMA KENICHI , ARASHI NORIO , MIYADERA HIROSHI
IPC分类号： F23D11/38 , B05B7/04 , B05B7/14
摘要： PURPOSE:To permit the supply of fuel, including solid particles such as coal, water slurry (CWM) or the like, into a mixing chamber under the condition of atomization fine particles, by a method wherein either one fluid of the fuel, flowing through a mixing prechamber, having an annular section, in the state of a thin film, or atomization medium is injected into the other fluid. CONSTITUTION:A mixing prechamber 12 communicates with a CWM supplying passage 5 through a CWM flow passage 3b. When atomizing medium is injected into CWM, flowing through the mixing prechamber 12 from upstream side to downstream side, an atomized medium supplying port 10b is provided with a direction, in which the injecting direction of atomizing medium, injected into the mixing prechamber 12, has a component along the flow direction of the CWM, another component orthogonal to the direction of the same and the other component along the tangential line with respect to the large diametral inner peripheral wall 12b. Further, the atomizing medium supplying port 10b is directed to aime at the part of downstream side of a small diametral inner peripheral wall 12a or a downstream end side small diametral inner peripheral wall surface 12a1. Accordingly, the CWM, flowing in the state of liquid film, is split effectively by the force and moment of turbulence due to turbulent flow caused by the atomizing medium which flows in a high speed, whereby atomized fuel may be prevented from producing rough particles.

6. 发明专利

JPS6233214A COAL WATER SLURRY ATOMIZER 失效
公开(公告)号：JPS6233214A
公开(公告)日：1987-02-13
申请号：JP17233785
申请日：1985-08-07
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： KOBAYASHI YOSHINOBU , AZUHATA SHIGERU , ARASHI NORIO , NARATO KIYOSHI , INADA TORU , SOMA KENICHI , OTSUKA KEIZO
IPC分类号： F23D99/00
摘要： PURPOSE:To reduce the mean particle diameter of spray, reduce the particle speed of slurry spray of coal water and provide a flame stability as well as a low NOx by a method wherein a pipe for supplying coal slurry is arranged at a center of an atomizer for atomizing the slurry of coal water with spray medium such as steam and then the spray medium is injected at a high speed with a specified angle. CONSTITUTION:An atomization and mixing chamber 14 for mixing slurry of coal water and spray medium is installed at the downstream side of a coal water slurry supplying pipe 16. An inner wall of the atomization and mixing chamber has a spray medium flow passage 15 opened in a tangential direction of the inner wall and at an angle forming an end surface of atomizer of a crossing point between the inner wall of the injection and mixing chamber and a side surface faced to a point where the atomization of the atomizer is discharged. A ceramic body 12 is attached to an extremity end of the injection and mixing chamber in order to prevent a nozzle chip from being worn out. Coal water slurry is pulverized into fine particle at first under a high speed circulation force, resulting in making the high speed injection particles; then, the slurry may be struck against the end surface of the atomizer. At this time, mainly the rough particles of the spray particles are pulverized again under their striking forces: the spray particles are pulverized and further they are dispersed and injected. As a result, a stable combustion is carried out just after the dispersed flow of spray is injected from the atomizer.

7. 发明专利

JPS61223411A CATALYST BURNING METHOD FOR PULVERIZED COAL 失效
公开(公告)号：JPS61223411A
公开(公告)日：1986-10-04
申请号：JP6069885
申请日：1985-03-27
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： AZUHATA SHIGERU , KOBAYASHI YOSHINOBU , ARASHI NORIO , NARATO KIYOSHI , INADA TORU , SOMA KENICHI , HIGASHIYAMA KAZUHISA , OTSUKA KEIZO
IPC分类号： F23D1/00 , F23D99/00
摘要： PURPOSE:To enable to achieve low NOx burning and high efficient burning simultaneously by burning residual combustibles with remaining burning air after promotion of low air oxidation and thermal decomposition of pulverized coal. CONSTITUTION:After air-fuel mixture composed of pulverized coal and air to convey coal is passed through a honeycomb-like catalyst layer 13, the mixture is injected into a furnace. In the catalyst layer 13, thermal decomposed gas generated from coal is oxidized by oxygen in primary air and gas temp. in the layer is raised up. The quantity of coal is increased corresponding to raised temp. and further, temp. is raised up by gas oxidation and thermal decomposition of coal is promoted simultaneously. Secondary air is utilized to run completely the combustible air-fuel mixture ejected from the catalyst layer. Thereby, oxidation of pulverized coal under low air ratio is promoted and volatile matter is enabled to spout before pulverized coal is injected into the furnace and therefore, improved performance of ignitability and burning of pulverized coal and also low NOx burning are obtained.

8. 发明专利

JPS6066016A CONTROLLER FOR COMBUSTION FLAME 失效
公开(公告)号：JPS6066016A
公开(公告)日：1985-04-16
申请号：JP17306083
申请日：1983-09-21
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： KOBAYASHI YOSHINOBU , ARASHI NORIO , AZUHATA SHIGERU , NARATO KIYOSHI , INADA TOORU , SOUMA KENICHI , OOTSUKA KEIZOU , HISHINUMA TAKAO
IPC分类号： F23C99/00 , F23N5/08
摘要： PURPOSE:To obtain the stable state of combustion to the wide load conditions of several burner for a pulverized coal combustion furnace by controlling the strength of swirling of combustion air or the speed of injection of fuel by detecting the positions of ignition of the flames of several burner. CONSTITUTION:A combustion flame controller is constituted by detectors 23 detecting the positions of ignition of flames fitted to a plurality of burners with vortex flow generators 21 ejecting combustion air as vortex flows and variable speed instruments 22 for air carrying pulverized coal, a computer 24 computing the positions of ignition of flames, a comparator 25 comparing the positions of ignition of flames, and a controller 26 controlling the vortex flow generators 21 and the variabel speed instruments 22 so that the position of ignition of several burner are made constant. A plurality of sensors 31, which detect beams from flames from the rectangular direction of the central axes of the burners and output the detecting value as electric signals, are fitted in the axial direction of the burners in the detectors 23. The sensors 31 must have excellent spatial resolving power is order to determine the positions of ignition of flames, and detect only beams from flames in some limited sections in the central axes of the burners.

9. 发明专利

JPS59195014A Low nox pulverized coal burner 失效
标题翻译：低NOX粉煤燃烧器
公开(公告)号：JPS59195014A
公开(公告)日：1984-11-06
申请号：JP6562183
申请日：1983-04-15
申请人： Babcock Hitachi Kk , Hitachi Ltd
发明人： NARATO KIYOSHI , ARASHI NORIO , AZUHATA SHIGERU , SOUMA KENICHI , INADA TOORU , KOBAYASHI YOSHINOBU , MASAI TADAHISA
IPC分类号： F23D1/02 , F23C99/00 , F23D1/00
CPC分类号： F23D1/00
摘要： PURPOSE:To enable reduction in production of NOX and also to improve the combustion efficiency, by a method wherein pulverized coal is collected to a central part to collectively burn it under a low air ratio condition. CONSTITUTION:A three-dimentional air injection nozzle 22 is positioned at the outer periphery part of a burner, and a tertiary air, flowing in through a resistor 21, is injected in a furnace to form a swirl flow with the aid of a swirl vane 23, whereby pulverized coal forms a combustion flame as it is partially swirled through the swirl force of the tertiary air. As a result, the central part of the furnace becomes short of the air. In the combustion range under a low air ratio condition of the central part A, volatile nitrogen compound such as NH3 is produced, combustion in the vicinity of a wall is conducted under a high air ratio condition to produced NOX. The swirl flow of the tertiary air promotes mixture on the slipstream side of the two flames, and causes NOX to be reduced into N2. This enables decrease of an amount of NOX exhausted from the furnace.
摘要翻译：目的：为了降低NOX的生产和提高燃烧效率，通过将粉煤收集到中央部分以在低空气比条件下共同燃烧的方法。构成：三维空气喷射喷嘴22位于燃烧器的外周部分，并且通过电阻器21流入的三次空气被注入炉中以借助于旋流叶片形成涡旋流其中粉煤形成燃烧火焰，因为其通过三次空气的涡流部分旋转。结果，炉的中心部分变得空气不足。在中心部A的低空气比条件下的燃烧范围内，产生NH 3等挥发性氮化合物，在空气比较高的条件下在壁附近进行燃烧，生成NOX。三次空气的涡流促进两种火焰滑流侧的混合物，并使NOX还原成N2。这使得能够减少从炉排出的NO x的量。

10. 发明专利

JPS59153012A Low nox burner for pulverized coal 失效
标题翻译：低NOx燃烧器用于粉煤
公开(公告)号：JPS59153012A
公开(公告)日：1984-08-31
申请号：JP2635683
申请日：1983-02-21
申请人： Babcock Hitachi Kk , Hitachi Ltd
发明人： ARASHI NORIO , AZUHATA SHIGERU , NARATO KIYOSHI , INADA TOORU , SOUMA KENICHI , OOTSUKA KEIZOU , HISHINUMA TAKAO , MASAI TADAHISA
IPC分类号： F23C99/00 , F23D1/00 , F23D1/02
CPC分类号： F23D1/02
摘要： PURPOSE:To reduce a quantity of NOX further, by providing an annular part delaying mixing of a mixed fluid of pulverized coal and primary air and revolving air between a nozzle spouting the mixed fluid and a secondary air nozzle. CONSTITUTION:A low NOX burner 10 for pulverized coal is provided with a mixed fluid nozzle 11 spouting a mixed fluid of the pulverized coal and primary air and a secondary air nozzle 16 which is arranged concentrically with the nozzle 11 and spouts secondary air 19 by making the air 19 revolve. A circular part 1' delaying mixing of the mixed fluid and secondary air 12 which is revolving air is provided between the nozzle 11 spouting the mixed fluid and the secondary air nozzle 16. With this construction, a flame at the first stage of the mixed fluid can be kept at a reducing flame of a high temperature, and sufficient reducing combustion is done, through which a generating quantity of NOX can be reduced quite effectively.
摘要翻译：目的：为了进一步减少NOX的量，通过在喷射混合流体的喷嘴和二次空气喷嘴之间提供环状部件来延迟粉煤混合流体和一次空气和旋转空气的混合。构成：用于粉煤的低NO X燃烧器10设置有喷射粉煤和一次空气的混合流体的混合流体喷嘴11和与喷嘴11同心设置并且通过制造二次空气19而喷出二次空气19的二次空气喷嘴16 空气19旋转。在喷射混合流体的喷嘴11和二次空气喷嘴16之间设置延迟混合流体和循环空气的二次空气12的圆形部分1'。在这种结构中，混合流体的第一阶段的火焰可以保持在高温的还原火焰下，并且进行充分的还原燃烧，可以非常有效地降低NOx的产生量。

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