• Title/Summary/Keyword: Pulverized Coal Injection

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Pulverized coal injection system development to raise combustion efficiencies of a blast furnace (고로의 연소효율을 높이기 위한 미분탄 공급 시스템 개발)

  • An, Young-Jin;Kang, Pub-Sung;Kwak, Na-Soo;Choi, Gyung-Min;Lee, Min-Cheol
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.3163-3168
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    • 2008
  • Pulverized coal (PC) has become an important auxiliary fuel in the iron and steel industry since the technique of pulverized coal injection (PCI) system was developed for iron making. Combustion efficiencies of pulverized coal in blowpipes and tuyeres under various operational are numerically predicted to recognize the performance with the locations of nozzles in a blast furnace. A variety of parameters including the pulverized coal quantities, oxygen amounts, inlet temperature of the tuyeres and mass flow rate of coal carrier gas are taken into consideration. Also In order to develop more efficient than existing coal injection system, this study applies a flame measurement system using a charge couple device (CCD) camera and frame grabber. And it has used algorithms of auto sampling from flame shape information and composed the device for location control of PCI. This study find to further improve the blast furnace performance by the control of PCI locations.

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The visualization of pulverized coal injection pattern (산화제 공급 각도 변경에 따른 미분탄 분사 패턴 가시화 연구)

  • Park, Seik;Seo, Haikyung;Lee, Joongwon;Kim, Uisik
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.78.2-78.2
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    • 2011
  • To achieve the required higher efficiency and lower emission performance, Korea's 300 MW IGCC RDD&D (Research Development, Demonstration and Dissemination) project was launched in December 2006 under the leadership of the Korea Electric Power Corporation (KEPCO), with the support of the Korea Ministry of Knowledge Economy. Our research group, KEPCO Research Institute had set-up the a coal gasifier for the pilot test and conducted many experiments for parametric study in this project. Our group focused visualization of pulverized coal injection pattern in the gasifier. Through this study we found that two types of coal burners having different oxygen supply angles can be a source changing gasification condition like temperature.

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Flame image precise measurement and flame control to raise combustion efficiencies of a blast furnace (고로의 연소효율을 높이기 위한 화염영상 정밀 검출 및 화염제어)

  • Kim, Jae-Yeol;Lee, Seung-Chul;Kwak, Nam-Su;Han, Jae-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.6
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    • pp.8-14
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    • 2014
  • Pulverized coal (PC) has become an important auxiliary fuel in the iron and steel industry since the technique of pulverized coal injection (PCI) was developed for iron making. The combustion efficiencies of pulverized coal in blowpipes and tuyeres under various operational conditions are numerically predicted to determine the performance levels with regard to different locations of the nozzles in a blast furnace. A variety of parameters, including the pulverized coal quantities, oxygen amounts, inlet temperatures of the tuyeres, and the mass flow rate of coal carrier gas are taken into consideration. Also, in order to develop greater efficiency than those of existing coal injection systems, this study applies a flame measurement system using a charge-coupled device (CCD) camera and a frame grabber. It uses auto sampling algorithms from the flame shape information to determine the device for the optimal location control for PCI. This study finds further improvements of the blast furnace performance via the control of the PCI locations.

Pulverized Coal Injection System Development to Raise Combustion Efficiency of a Blast Furnace (고로미분탄 취입랜스의 연소효율 향상을 위한 노즐 제어의 최적화)

  • Choi, Seung-Hyun;Kwak, Na-Soo;Kim, Jae-Yeol
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.6
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    • pp.690-696
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    • 2009
  • This paper introduces the automatic fine Bituminous Coal injection lance position control method using flame image process. The fine Coal injection lance is used to supply additional heat into the furnace in Mill plant. It injects fine coal into high pressured air flow and produces very heated and high pressured flame. For the such high temperature and pressure, the fine coal injection lance effects not only efficiency of burner but also furnace abrasion. To keep efficient combustion status and to avoid the abrasion, in this paper, the flame is monitored by computer image process. This paper proposes the flame image process method and lance position control according to calculated result for flame image process.

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An Experimental Study on the Separating Effect of Pulverized Coal at Coal Nozzle with Coal Separator (석탄 노즐내 미분탄 분리장치의 입자 분리 효과에 관한 실험적 연구)

  • Kim, Hyuk-Je;Song, Si-Hong;Lee, Gun-Myung;Kim, Sang-Hyeun;Lee, Ik-Hyung
    • Proceedings of the KSME Conference
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    • 2001.11b
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    • pp.764-769
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    • 2001
  • Recently, according to increase in the requirement of electric power, a thermoelectric power plant equipped with pulverized coal combustion system is highly valued, because coal has abundant deposits and a low price compared with others. For efficient use of coal fuel, most of plant makers are studying to improve combustion performance and flame stability, and reduce pollutant emission. One of these studies is how to control the profile of particle injection and velocity dependant on coal nozzle. Basically, a mixed flow of gas and particle in coal nozzle is required to have appropriate injection and concentration distribution at exit to achieve flame stability and low pollutant, but it is very difficult to obtain that without help of a coal separating device within nozzle. In this study, each distribution of air and coal flow rate is measured for the coal nozzle with coal separator developed by us. The coal concentration at exit is various according to inlet swirl values and positions of coal separator. Also pressure drop is measured for various operating conditions of this nozzle. From these results, we can find the separation characteristic of new developed coal separator, and select proper operation range of coal nozzle. When this coal nozzle is applied to actual plant, these investigations will be very useful to confirm the shape of coal separator to have efficient particle injection.

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Cross-section micrography of burning pulverized coal particles (연소중 미분탄의 단면관측)

  • 한재현;최상민
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.4
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    • pp.717-725
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    • 1989
  • An experimental investigation on the combustion behavior of pulverized coal particles was performed using the cross-section micrography techniques while sample coal particles were collected in-situ from the flow reactor. The coal particles were representative of pulverized bituminous coal undergoing a raped pyrolysis and combustion, however, quenched at the time when the particles were deposited onto a sample plate. The internal structure of coal was observed to change as deposited. Upon injection into a flow reactor, bituminous coal particles showed many holes which represented internal pore formation during the pyrolysis. The relative portion of the remaining matrix of coal was decreasing as the residence time progressed. This direct observation of cross-section of burning particles enabled better understanding of the coal combustion behavior.

A Numerical Study for Optimum Configuration of Pulverized Coal Nozzle to Prevent Uneven Distribution of Particle (분사된 미분탄의 편중분포 방지를 위한 내부장치 최적화에 관한 수치 해석적 연구)

  • Kim, Hyuk-Je;Song, Si-Hong;Park, Seok-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.2
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    • pp.270-279
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    • 2000
  • Recently, according to increase in the requirement of electric power, a thermoelectric power plant equipped with pulverized coal combustion system is highly valued, because coal has abundant deposits and a low price compared with others. For efficient use of coal fuel, most of plant makers are studying to improve combustion performance and flame stability, and reduce pollutants emission. One of these studies is how to control the profile of particle injection and velocity dependant on coal nozzle configuration. Basically, nozzle which has mixed flow of gas and particle is required to have the balanced coal concentration at exit, but it is very difficult to obtain that by itself without help of other device. In this study, coal distribution and pressure drop in gas-solid flow are calculated by numerical method in nozzle with various shapes of venturi diffuser as a means to get even coal particle distribution. The tentative correlations of pressure drop and exit coal distribution are deduced as function of the height, length and reducing angle of venturi from the calculated results. When coal hurner nozzle is designed, these equations are very useful to optimize the shape of venturi which minimize uneven particle distribution and pressure drop within coal nozzle.

Experimental Study on Particle Temperature and CO/CO2 Emission Characteristics of Pulverized Coal Combustion Condition According to Coal Types in Blast Furnace (고로 내 미분탄 연소조건에서 탄종에 따른 입자온도와 CO/CO2 배출 특성에 관한 연구)

  • Cho, Young Jae;Kim, Jin Ho;Kim, Ryang Gyun;Kim, Gyu Bo;Jeon, Chung Hwan
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.10
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    • pp.807-815
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    • 2014
  • This study was performed using a laminar flow reactor that could replicate the combustion environment of pulverized coal in a blast furnace. Since a pulverized coal injection system was developed for iron making, the combustion characteristics of pulverized coal have been important in the iron and steel industry. The flame structure, particle temperature, and exhaust gas were investigated for different types of coal. The results of this study demonstrated that the combustion characteristics of coal are influenced by several properties of individual coals. In particular, the CO emission and volatile matter content of individual coals were found to have a strong influence on their combustion characteristics. Thus, this study found the properties of the coals to be significant and focused on the particle temperature and CO and $CO_2$ emissions.

The Development of High Performance Flame Stability(HPFS) Tangential Coal-Fired Burner (고효율 화염 안정형 접선식 석탄 버너 개발)

  • Kim, Hyeok-Pill;Kim, Sang-Hyeun;Kim, Hyuk-Je;Song, Si-Hong
    • Journal of the Korean Society of Combustion
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    • v.11 no.2
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    • pp.1-6
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    • 2006
  • This report presents a study of the development of an advanced coal nozzle used in burners to reduce unburned carbon (UBC) in a tangential coal-fired boiler. To understand the mechanism of UBC reduction, experiments using conventional burners were carried out to evaluate the effects of air injection velocity, coal fineness and over fired air (OFA) on combustion efficiency. It was confirmed that ignition of pulverized coal particles close to the burner is helpful toward the complete burn of residual carbon in fly ash. These efforts indicated the additional results that UBC was strongly dependent on the primary air velocity and coal fineness; especially that UBC dramatically decreased when the weight fraction of pulverized coal under $75{\mu}m$ was over 85 %. New coal nozzles, modified from conventional nozzles, were prepared and tested to improve the combustion efficiency. Some of these nozzles offered relatively lower unburned carbon than those of conventional burners and are referred to as HPFS (High Performance Flame Stability) coal nozzles.

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A study on the NOx emission characteristics with combustion air flow conditions in air-staged coal burner (공기다단 석탄버너에서 연소공기 유동조건에 따른 NOx 배출특성에 관한 연구)

  • Kim, Hyuk-Je;Song, Si-Hong;Kim, Sang-Hyeun;Lee, Ik-Hyung
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.379-384
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    • 2003
  • Coal-burning utilities are facing a major NOx control compliance challenge due to the heavy emission regulation. In response to this challenge, some applicative technologies to effectively reduce NOx are developed and applied in the pulverized coal power plants. One of these is low NOx burner(LNB) equipped with multi-staged air register. In this study, NOx emission rate and flame shapes are investigated with secondary and tertiary air flow conditions in air staged coal burner, and the optimal windows of flow conditions to minimize NOx emission rate are found out. The test conditions treated in this study are the flow rate, swirl direction and intensity and throat injection velocity of secondary and tertiary air.

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