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1. 发明专利

JPH028602A METHOD FOR COMBUSTION WITH LOW NOX OF PULVERIZED COAL AND COMBUSTION BURNER 失效
公开(公告)号：JPH028602A
公开(公告)日：1990-01-12
申请号：JP15682088
申请日：1988-06-27
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： NARATO KIYOSHI , AZUHATA SHIGERU , KOBAYASHI YOSHINOBU , SOMA KENICHI , ARASHI NORIO , INADA TORU , MORITA SHIGEKI
IPC分类号： F23D1/00 , F23C99/00
摘要： PURPOSE:To improve a combustion characteristic and make a substantial reduction of an amount of applied auxiliary liquid fuel when a load is varied by a method wherein an auxiliary flame is formed in a low NOX combustion burner for pulverized coal. CONSTITUTION:A pulverized coal nozzle 1 for use in injecting pre-mixture 5 of pulverized coal and primary transmitted air is arranged at a central part of a burner, and a nozzle 4 for injecting pre-heated liquid fuel 8 is arranged within the burner. A gas fuel nozzle 12 for injecting the pre-mixture gas of gaseous fuel 13 and combustion air 14 is arranged around an outer circumference of the pulverized coal nozzle 1, and then a secondary air nozzle 2 and a third air nozzle 3 are arranged around the fuel nozzle 12. After preheating of a combustion device under combustion of liquid fuel 18, pre-mixture 5 is fed from the pulverized coal nozzle 1 so as to form a pulverized coal flame. After this operation, premixed gaseous fuel 13 and combustion air 14 is fed so as to form a pilot flame around an outer circumference of an extremity end of the pulverized coal nozzle 1 and to keep a flame holding effect.

2. 发明专利

JPS6457004A LOW NOX EMITTING BURNER 失效
公开(公告)号：JPS6457004A
公开(公告)日：1989-03-03
申请号：JP21279087
申请日：1987-08-28
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： AZUHATA SHIGERU , NARATO KIYOSHI , KOBAYASHI YOSHINOBU , SOMA KENICHI , INADA TORU , IWAI YASUO , ARASHI NORIO , MORITA SHIGEKI
IPC分类号： F23C99/00 , F23D1/00 , F23D1/02
摘要： PURPOSE:To control the emission of NOX at the time of burning pulverized coal by disposing a spacer between the secondary air nozzle and third air nozzle, and providing the pulverized coal nozzle with a flame stabilizer. CONSTITUTION:Pulverized coal ejected from a fuel nozzle 2 is ignited by the carrier primary air and secondary air ejected from a secondary air nozzle 4 to form a low air content flame in the center of the flame. Said low air content flame extends radially outwardly from the end of the nozzle 2. The flame is stabilized by a flame stabilizer plate 10 and the secondary air flow and its spiral intensity adjustment. In the present burner, the mixing of the third air and the low air content flame is retarded due to the presence of a spacer between the third air ejected from a third air nozzle 6 and the secondary air jet, and after oxygen in the combustion air is consumed in the low air content flame by the ignition near the burner throat 26, the reduction ambient air with a low oxygen content is formed. The third air causes complete combustion of remaining unburnt fuel after NOX is reduced in the reduction ambient air.

3. 发明专利

JPS63140208A PULVERIZED COAL BURNER 失效
公开(公告)号：JPS63140208A
公开(公告)日：1988-06-11
申请号：JP28628786
申请日：1986-12-01
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： AZUHATA SHIGERU , SUDO KIYOSHI , SOMA KENICHI , KOBAYASHI YOSHINOBU , MASUTANI MASAO , INADA TORU , ARASHI NORIO , MIYADERA HIROSHI , MORITA SHIGEKI
IPC分类号： F23D1/00
摘要： PURPOSE:To promote the ignition of pulverized coal by a method wherein a pulverized coal nozzle and a secondary air nozzle are installed coaxially and the cross sectional area of a secondary air passage in the secondary air nozzle is formed eccentrically with reference to a coaxial center. CONSTITUTION:A pulverized coal nozzle 16 has an elliptical cross sectional shape, and thereby the cross sectional area of a secondary air passage in a secondary air nozzle is formed eccentrically with reference to a coaxial center. At the tip of the nozzle 16 a diffuser-shaped flame holding device 21 is placed. At the center of a burner 10 an auxiliary fuel nozzle 15 burning auxiliary fuel is attached. Thus, the secondary and tertiary air are spouted into a combustion chamber 11 as circular ring-shaped jet streams from the nozzle 17 and a tertiary air nozzle 18. On the other hand, pulverized coal is spouted as an elliptical jet stream from the elliptical nozzle 16. Thereby, the mixing of the secondary air having an air flow rate necessary for ignition at the optimum condition and the pulverized coal near the outlet of the burner 10 is promoted.

4. 发明专利

JPS62276309A BURNER DEVICE 失效
公开(公告)号：JPS62276309A
公开(公告)日：1987-12-01
申请号：JP11925886
申请日：1986-05-26
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： NARATO KIYOSHI , AZUHATA SHIGERU , KOBAYASHI YOSHINOBU , SOMA KENICHI , INADA TORU , ARASHI NORIO , MIYADERA HIROSHI , MASAI TADAHISA
IPC分类号： F23L1/00 , F23C99/00 , F23D11/24
摘要： PURPOSE:To enable facilitation of regulation of a combustion state, by a method wherein flow rates of secondary and tertiary air and the number of swirls are controlled independently from each other. CONSTITUTION:At a point of time when a burner is shifted to a pulverized coal only combustion mode. NOx concentration and O2 concentration at the outlet of a furnace are continuously monitored. Since NOx concentration is influenced by a composition ratio of secondary air 9 and tertiary air 10, the openings of butterfly vanes 11 and 13 are regulate and controlled so that a composition ratio is adjusted to a previously experimentally determined value. It is described in a comparing computer 27 that O2 concentration in exhaust gas is to be based on, for example, 3%. Driving motors 21 and 23 are run through the working of a vane system control device 25 so that O2 concentration is adjusted to a given value, the openings of the butterfly vanes 11 and 13 are regulated, and indication of an O2 monitor is set to 3%. A signal from an NOx concentration monitor 29 is inputted to a comparing computer 27 to compare the NOx concentration with a preset value, the result is transmitted to a combustion monitoring control device 26, driving motors 22 and 24 are run through the working of the vane opening control device 25, and the openings of resistor vanes 12 and 14 are automatically regulated.

5. 发明专利

JPS62158906A LOW NOX COMBUSTION BURNER FOR COAL AND WATER SLURRY 失效
公开(公告)号：JPS62158906A
公开(公告)日：1987-07-14
申请号：JP62986
申请日：1986-01-08
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： AZUHATA SHIGERU , HIGASHIYAMA KAZUHISA , NARATO KIYOSHI , KOBAYASHI YOSHINOBU , ARASHI NORIO , INADA TORU , SOMA KENICHI , OTSUKA KEIZO
IPC分类号： F23D99/00 , F23C99/00
摘要： PURPOSE:To get a stable flame of CWM at the same time to improve an efficiency of combustion as well as to reduce NOX by a method wherein two preliminary combustion chambers are arranged in a coal and water slurry (CWM) burner. CONSTITUTION:CWM of fuel is injected from a nozzle 1 and turned into fine particles and then ignited at a primary combustion chamber 4 constituted by a block 7 of ceramics installed around an outer circumference of the nozzle 1. The fuel is ignited with secondary air within a cylindrical secondary preliminary combustion chamber 5 at downstream side and thereafter the fuel is completely ignited with ternary air within a combustion furnace. When the primary preliminary combustion chamber 2 is made of ceramic block 7 having a high thermal accumulation property instead of steel, resulting in that the heat is accumulated in the block during a preliminary heating operation and further the ignition of CWM is facilitated with this heat. With the installation of the secondary preliminary combustion chamber 5, a formation of the low air flame is facilitated and an effect of a low NOX combustion can be improved.

6. 发明专利

JPS6226413A SPRAY METHOD OF COAL AND WATER SLURRY BURNER 失效
公开(公告)号：JPS6226413A
公开(公告)日：1987-02-04
申请号：JP16579685
申请日：1985-07-29
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： KOBAYASHI YOSHINOBU , AZUHATA SHIGERU , ARASHI NORIO , NARATO KIYOSHI , INADA TORU , SOMA KENICHI , HIGASHIYAMA KAZUHISA , OTSUKA KEIZO , MASAI TADAHISA
IPC分类号： F23D99/00 , F23C99/00
摘要： PURPOSE:To be able to reduce the generation of NOx when CWM is burnt, by making spouting angle of secondary air smaller than that of an atomizer and also air ratio of secondary air above the theoretical air ratio 0.3. CONSTITUTION:A burner comprises an atomizer 11 spouting CWM (coal and water slurry) and two air nozzles spouting air, and at the periphery of the atomizer 11, secondary air nozzles 14 is installed to make concentric circle with the atomizer 11 and spouting angle of secondary air G is made smaller than that of the atomizer 11. Here, when air ratio (actual air amount to the theoretical air amount for complete burning) of secondary air amount to total air amount for burning is made above 0.3, then the generation of NOx is reduced and CO and unburnt combusibles in ash are reduced in quantity and high efficiency in burning rate is obtained at the same time.

7. 发明专利

JPS61207497A METHOD OF SPRAYING SLURRY OF COAL IN WATER 失效
公开(公告)号：JPS61207497A
公开(公告)日：1986-09-13
申请号：JP4834185
申请日：1985-03-13
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： HIGASHIYAMA KAZUHISA , ARASHI NORIO , AZUHATA SHIGERU , NARATO KIYOSHI , SOMA KENICHI , INADA TORU , KOBAYASHI YOSHINOBU , OTSUKA KEIZO , HISHINUMA TAKAO
IPC分类号： C10L1/32
摘要： PURPOSE:To provide the title method capable of forming a fine coalwater spray particles without increase in injection speed from a spray nozzle for improvement in ignitability and combustion characteristics, by adding a specific solid additive to a slurry of a coal in water and conducting a spray combustion of the slurry. CONSTITUTION:In conducting a spray combustion of a slurry of a coal in water, a solid additive of which the thermal decomposition temperature is lower than or substantially the same as that of the coal is previously added to the slurry of a coal in water. The cracked gas generated by the thermal decomposition of the solid additive causes the burst of droplets of the slurry of a coal in water or the dried particles to be burst from the inside thereof. Although the solid additive (e.g.: calcium oxalate) is preferably those having a small solubility in water, those having a relatively large solubility in water may also be used when they can cause the deposition of a solid phase between the coal particles accompanying the evaporation of water and thermally decompose.

8. 发明专利

JPS60159515A FURNACE SYSTEM 失效
公开(公告)号：JPS60159515A
公开(公告)日：1985-08-21
申请号：JP1184584
申请日：1984-01-27
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： SOUMA KENICHI , ARASHI NORIO , AZUHATA SHIGERU , NARATO KIYOSHI , INADA TOORU , KOBAYASHI YOSHINOBU , OOTSUKA KEIZOU , HISHINUMA TAKAO
IPC分类号： F23N5/00 , F23N5/08 , G01J1/42
摘要： PURPOSE:To carry out correct measurement of the combustion state and combustion control of high accuracy and quick response based on this measurement by utilizing light emitted from the flame, separating the light into an arbitrary specific wavelength zone, and discriminating the combustion state of the combustion flame with non-contact from the luminescent strength and luminescent pattern of the light to control the combustion flame. CONSTITUTION:Light emitted from a flame 650 is collected in a light pick-up device 660, and is introduced to a spectroscope 680 by means of an optical fiber 670. The spectroscope 680 is provided with a converter which converts light signals relative to the luminescent strength and the luminescent pattern into electrical signals. These signals are amplified by an amplifier 690, and introduced into a controller 700. The output signal from the amplifier 670 is compared in a discriminator 710 with an output signal from a memory device 720 which stores the luminescent strength and the luminescent pattern in an arbitrary specific wavelength region at the optimum combustion state time as electrical signals. The output signal from the result of comparison is introduced to a controller 730 outputting a control signal for controlling the combustion state of the flame.

9. 发明专利

JPS6089608A PULVERIZED COAL COMBUSTION BURNER 失效
公开(公告)号：JPS6089608A
公开(公告)日：1985-05-20
申请号：JP19728083
申请日：1983-10-21
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： NARATO KIYOSHI , ARASHI NORIO , AZUHATA SHIGERU , KOBAYASHI YOSHINOBU , INADA TOORU , SOUMA KENICHI , OOTSUKA KEIZOU , HISHINUMA TAKAO
IPC分类号： F23D1/00 , F23D1/02
摘要： PURPOSE:To provide a pulverized coal combustion burner which prevents wearing of a swirl flow generator, enables maintenance of a low NOX and high combustion efficiency for a long time, and has the stabilized performance, by a method wherein the air for combustion is swirled after joining pulverized coal for combustion on the wake flow side of a swirl flow generator. CONSTITUTION:A tertiary air A3 forms a swirl flow by means of a swirl flow generator 14, a secondary mixture flow F2, injected in an outer injection pipe 12 from a fuel feed pipe 15, is drawn in a tertiary air, and the mixture flow forms a swirl flow in a fuel swirl region 16 and is injected in a furnace through the outer injection pipe 12. This enables production of the swirl effect of the secondary mixture flow. Further, the swirl flow generator 14 is so constituted as to pass only the tertiary air A3 for combustion containing no pulverized coal. This prevents wearing of the swirl flow generator 14 due to the passage of pulverized coal, enables maintenance of stable performance (a low NOX effect), and permits substantial contribution to improvement of reliability of a device.

10. 发明专利

JPS5997408A COAL COMBUSTION METHOD AND BURNER THEREFOR 失效
公开(公告)号：JPS5997408A
公开(公告)日：1984-06-05
申请号：JP20610982
申请日：1982-11-26
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： NARATO KIYOSHI , AZUHATA SHIGERU , ARASHI NORIO , INADA TOORU , SOUMA KENICHI , MASAI TADAHISA
IPC分类号： F23C99/00 , F23D1/00
摘要： PURPOSE:To suppress the production of NOx and unburnt substance, by mixing a pulverized coal combustion gas with a classified coal combustion gas at the backward side of pulverized coal flame. CONSTITUTION:Combustion burners 28, 30, 32 are respectively provided at the central portion thereof with a pulverized coal jet nozzle 38 for jetting out a pulverized coal 34. An exhaust gas jet nozzle 42 is formed around the periphery of pulverized jet nozzle 40. The pulverized coal jet nozzle 42 has a revolving blade 44 provided therein for swirlingly spouting a coarse grain coal 24. In this manner, when a finely pulverized coal combustion gas and a coarse grain coal combustion gas are sufficiently mixed together, NH3 and HCN contained in the pulverized coal combustion gas react with NOx of coarse grain coal combustion gas to reduce the NOx into N2. On the other hand, unburnt substances of finely pulverized coal combustion gas react with an excess oxygen of coarse grain coal combustion gas to be burnt eventually.

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