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1. 发明专利

JPH0221107A LOW NOX COMBUSTION METHOD FOR PULVERIZED COAL 失效
公开(公告)号：JPH0221107A
公开(公告)日：1990-01-24
申请号：JP13904589
申请日：1989-06-02
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： INADA TORU , ARASHI NORIO , AZUHATA SHIGERU , NARATO KIYOSHI , SOMA KENICHI , KOBAYASHI YOSHINOBU , OTSUKA KEIZO , HISHINUMA TAKAO , MASAI TADAHISA
IPC分类号： F23D1/00 , F23C99/00
摘要： PURPOSE:To reduce NOx generated during the combustion of dust coal by turning volatile nitrogen oxides contained in the dust coal into reducing nitrogen oxides, such as NH3, and HCN in an air shortage region formed by the combustion of a main burner, and reducing NOx generated in an air excess region formed by the combustion of a sub burner. CONSTITUTION:Combustion flames formed by a main burner 52 are arranged to have an air ratio of 0.9 to 1.0 and get subjected to rather imperfect combustion, produce reducing substances generation atmosphere, and form perfect combustion state in a region where the combustion flames generated by a sub burner 53 have an excess air ratio of 1.1 and over. In other words, NOx generated by the sub burner 53 is reduced by reducing nitrogen oxides, such as NH3, and HCN so as to reduce NOx.

2. 发明专利

JPS61187946A CRUSHING SORTER 失效
公开(公告)号：JPS61187946A
公开(公告)日：1986-08-21
申请号：JP2632885
申请日：1985-02-15
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： YOSHIOKA SUSUMU , OTSUKA KEIZO , KODA FUMIO , FUJIWARA NAOKI
IPC分类号： B02C15/12

3. 发明专利

JPS61289226A COMBUSTION METHOD OF PULVERIZED COAL 失效
公开(公告)号：JPS61289226A
公开(公告)日：1986-12-19
申请号：JP12985185
申请日：1985-06-17
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 , F23N5/00 , F23N5/08
摘要： PURPOSE:To reduce the content of nitrogen oxides contained in combustion gases, by controlling the feeding method of fuel coal and air, measuring the composition of combustion gases and temperature distribution around a burner, and determining combustion efficiency using said composition of combustion gas. CONSTITUTION:Analysis of combustion-gas composition is conducted by extracting a part of combustion gas before said combustion gas passes through an air heater 54, and analyzing said extracted gas by means of a gas analyzer 41, the result of which is sent to a gas- composition recorder 42. Said result of analysis is compared with signals from a gas- composition setting means 43 by means of a gas-composition comparison means 44 and sent to a central computing means 45. Analysis of temperature distribution is carried out using light received by an image fiber 23 disposed on a burner 10, said light being dispersed by means of a spectroscopic analyzer 46. The result of said analysis is used in a temperature computing means 47 for the calculation of the temperature distribution around the burner, compared with signals from a temperature distribution setting means 48 by means of a temperature distribution comparison means 49, and sent to the central computing means 45, where the state of combustion is judged to determine the degree of swirling of combustion air to be transmitted to a swirl-vane driving means 50 for controlling the dispersion of pulverized coal.

4. 发明专利

JPS61129047A Crushing sorter 失效
公开(公告)号：JPS61129047A
公开(公告)日：1986-06-17
申请号：JP25124084
申请日：1984-11-28
申请人： Hitachi Ltd , Babcock Hitachi Kk
发明人： YOSHIOKA SUSUMU , OTSUKA KEIZO , KODA FUMIO , FUJIWARA NAOKI
IPC分类号： B07B7/083 , B02C15/12

5. 发明专利

JPS6195094A Production of coal-water slurry 失效
标题翻译：生产煤浆水泥
公开(公告)号：JPS6195094A
公开(公告)日：1986-05-13
申请号：JP21586984
申请日：1984-10-15
申请人： Babcock Hitachi Kk , Hitachi Ltd
发明人： MURANAKA TADASHI , KAJI RYUICHI , OTSUKA KEIZO
IPC分类号： C10L1/32
摘要： PURPOSE: Coarsely crushed coal is combined with a coal with higher Hardgrove index, then subjected to intermediate crushing and final fine crushing to enable the production of coal-water slurry of high concentration with coal-crushing time shortened, crushing power saved.
CONSTITUTION: The starting coal coarsely crushed is mixed with another coal with high Hardgrove index than that of the starting coal, preferably of more than 50, preferably in an amount less than 50wt%, then subjected to intermediate crushing (less than 300W500 micrometer particle sizes), then fine crushing (less than several to several tens micrometers) to give the objective coal-water slurry. The product shows improved storage stability.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：粗粉碎煤与Hardgrove指数较高的煤组合，经过中间破碎和最终细粉碎，能够生产高浓度的煤水浆料，压缩时间缩短，破碎功率节省。构成：将粗粉碎的起始煤与另一种具有高于起始煤的Hardgrove指数的煤混合，优选大于50，优选小于50重量％的煤，然后进行中间破碎（小于300-500微米颗粒尺寸），然后进行细粉碎（小于几至几十微米），得到目标煤 - 水浆料。该产品显示出改进的储存稳定性。

6. 发明专利

JPH0339804A BURNER FOR COMBUSTION OF PULVERIZED COAL 失效
公开(公告)号：JPH0339804A
公开(公告)日：1991-02-20
申请号：JP1858890
申请日：1990-01-29
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
摘要： PURPOSE:To suppress the generation of NOx with an increased effect and reduce the discharged unburned portion by providing a first nozzle for ejecting pulverized coal and burning it at an excess air factor of over 1 and a second nozzle surrounding the first nozzle and for ejecting pulverized coal and burning it. CONSTITUTION:A pulverized-coal burner comprises nozzles 12, 13 for pulverized coal, a secondary air nozzle 17, a tertiary air nozzle 18, and an igniter 16. By ejection of a greater proportion of pulverized coal for fuel from the pulverized-coal nozzle 12 and secondary air and tertiary air from the secondary air nozzle 17 and the tertiary air nozzle 18 respectively, a primary combustion region 21 with an excess air factor of over 1 is formed at the tip of the burner. The pulverized coal nozzle 13 is formed along the outer periphery of the tertiary air nozzle 18; from this nozzle 13, a fuel mixture whose oxygen content is adjusted to a concentration of 3-5% by volume and composed of discharged gas from the combustion, air, and pulverized coal is ejected so that around the primary combustion region 21 there are formed a secondary combustion region 22 and for oxidation of products of reductive thermal decomposition generated at the combustion region 22 and for reduction of NOx generated at the combustion region 21 a tertiary combustion region 23.

7. 发明专利

JPH0244111A PULVERIZED COAL COMBUSTION METHOD 失效
公开(公告)号：JPH0244111A
公开(公告)日：1990-02-14
申请号：JP19092589
申请日：1989-07-24
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： NARATO KIYOSHI , KOBAYASHI YOSHINOBU , INADA TORU , ARASHI NORIO , SOMA KENICHI , HIGASHIYAMA KAZUHISA , OTSUKA KEIZO , HISHINUMA TAKAO , MASAI TADAHISA
IPC分类号： F23C99/00
摘要： PURPOSE:To reduce the generation amount of NOX and to improve combustibility of pulverized coal by a method wherein combustion in a low air ratio in which NH3 is produced from a nitrogen compound in pulverized coal is effected at the former stage, and combustion in an air ratio of at least 1 is effected at the latter stage. CONSTITUTION:An auxiliary fuel injection nozzle 9 is arranged, and a flame stabilizer 4 is positioned along the tip of a pulverized coal injection nozzle 1. Pulverized coal is injected in a state, in which pulverized coal is spread in a furnace by means of primary air G1, through a flame stabilizer 4. In this case, the inner side of the flame stabilizer 4 is brought into a negative pressure state, and a part of secondary air G2 injected through a nozzle 2 is drawn in a position inside the pulverized coal and primary air G1 injection nozzle 1. By means of warp plates 5 and 6 positioned at the tips of the nozzles 2 and 3 and inclined at a given angle with the injection directions of the secondary air G2 and tertiary air G3, mixture of most of airs G2 and G3 with a mixture flow of pulverized coal and the primary air G1 at a central part is delayed. Combustion in a low air ratio is effected at the former stage by means of a mixture flow of the primary air and pulverized coal. At the latter stage, the secondary air and tertiary air are mixed together to perform combustion in an air ratio of at least 1.

8. 发明专利

JPS62158792A PRODUCTION OF HIGHLY CONCENTRATED COAL-WATER SLURRY 失效
公开(公告)号：JPS62158792A
公开(公告)日：1987-07-14
申请号：JP63086
申请日：1986-01-08
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： KAJI RYUICHI , KIKUCHI HIDEO , MURANAKA TADASHI , OTSUKA KEIZO
IPC分类号： B01J13/00 , C10L1/32 , C10L10/18
摘要： PURPOSE:To produce the titled slurry at low cost without adversely affecting the properties of high concentration and low viscosity despite decreased dispersant usage, adding water, a dispersant, a radial polymerization reaction retarder, etc., to coal and grinding the coal. CONSTITUTION:Added to coal are water and a dispersant (e.g., anionic dispersant), and further at least one member selected from a radical polymerization retarder (e.g., hydroquinone), a radical polymerization inhibitor (e.g., naphthoquinone) and an antioxidant (e.g., 2,4,6-trimethylphenol). The coal is ground in the above-added materials to produce a highly concentrated coal-water slurry. According to this process, the usage of a dispersant can be decreased in the manufacture of a coal-water slurry having a high fluidity. That is, while the dispersant usage ranges from 0.5-1.0% in the past,the usage can be decreased to 0.1-0.2% according to the present process. Thus it is possible to produce a slurry as desired in an economical manner.

9. 发明专利

JPS6227050A METHOD FOR CRUSHING COAL SLURRY 失效
公开(公告)号：JPS6227050A
公开(公告)日：1987-02-05
申请号：JP16579585
申请日：1985-07-29
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： MURANAKA TADASHI , KAJI RYUICHI , OTSUKA KEIZO
IPC分类号： B02C17/00

10. 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.

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