Guohua Power's coal mill and boiler combustion technology have passed technical appraisal.
Release time:
2013-08-08
Recently, the China Electromechanical Engineering Society held a technical appraisal meeting for the project "Research and Application of Boiler Combustion Technology for Ultra-High Moisture Lignite in Medium-Speed Grinding Systems" in Beijing. This project is led by Guohua Electric Power Company, with participation from Guohua Electric Power Research Institute and Shenhua Guohua (Indonesia) South Sulawesi Power Co., Ltd. Through adjustments in boiler combustion and coal mill operation, the project successfully achieved the combustion of ultra-high moisture (52-54%) low-quality lignite in medium-speed grinding boilers, completely resolving a series of major safety and environmental issues caused by coal drying, allowing the power plant to turn losses into profits and bringing honor to the country. Vice President of the China Electric Power Planning and Design Institute.
Recently, the China Electromechanical Engineering Society held a technical appraisal meeting for the project "Research and Application of Ultra-High Moisture Lignite Coal Technology for Boiler Combustion in Medium-Speed Grinding Systems" in Beijing. This project is led by Guohua Electric Power Company, with participation from Guohua Electric Power Research Institute and Shenhua Guohua (Indonesia) South Sulawesi Power Co., Ltd. Through adjustments in boiler combustion and coal mill operation, the project successfully achieved the combustion of ultra-high moisture (52-54%) inferior lignite in medium-speed grinding boilers, completely resolving a series of major safety and environmental issues caused by coal drying, turning the power plant from loss to profit, and earning honor for the country.
Sun Rui, the Deputy Director and Chief Engineer of the China Electric Power Planning and Design Institute, served as the chairman of the appraisal committee, while Jiang Zhesheng, an advisor to the National Electric Power Technology Market Association, served as the vice chairman. Ten well-known experts from Tsinghua University's Department of Thermal Engineering, Zhejiang University's Department of Mechanical and Energy Engineering, North China Electric Power University's School of Energy Power and Mechanical Engineering, Shanghai Electric Power Equipment Design Research Institute, Datang International Power Generation Co., Ltd., North China Electric Power Research Institute Co., Ltd., Xi'an Thermal Engineering Research Institute Co., Ltd., and China Huadian Engineering (Group) Co., Ltd. were appointed as members of the appraisal committee.
At the meeting, the appraisal committee listened to the project's work report, technical report, operation report, economic benefit analysis report, technology review report, and application situation introduction. After inquiry and discussion, the appraisal committee concluded that the research results of this project achieved safe and stable operation of the medium-speed grinding system boiler using ultra-high moisture lignite, providing a reference for the application of similar high-moisture lignite in thermal power plants, and overall reaching an internationally advanced level.
Shenhua Guohua Indonesia (South Sulawesi) Power Company is Shenhua Group's first overseas investment project integrating coal and power. The first phase of the power plant consists of 2×150MW coal-fired generating units, using lignite from a nearby pit coal mine. The boiler grinding system is designed as a positive pressure direct blow medium-speed coal mill. The Indonesian Guohua Mu Yin coal power project has a 2×150MW generating unit coal drying system that uses a steam pipe rotary dryer process to dry the locally sourced high-moisture lignite. Design conditions: the moisture content of lignite is dried from 55.3% to 37.8%. The raw coal excavated from the coal mine is dried from 55.3% to 37.8% using the steam dryer before being sent to the boiler's raw coal hopper, where it is ground by the medium-speed coal mill and then sent into the furnace for combustion. After the unit was put into operation, it was found that the moisture content of the raw coal from the mine reached 63% or more, far exceeding the designed coal quality. When the steam dryer dried the 63% moisture raw coal to about 48% moisture, the coal conveyor belt from the dryer to the raw coal hopper resembled a black dragon raging, making it impossible to control the dust flying around, leading to fires or explosions wherever the dust settled. The power plant personnel were confused and engaged in firefighting and explosion prevention every day.
Through operational combustion adjustments and related tests of the grinding system, the boiler equipped with a direct blow medium-speed coal mill achieved the combustion of inferior lignite with ultra-high moisture content of 52-54%, turning the impossible into reality, setting a precedent for the application of power technology, and providing detailed operational data and practical experience for promoting the use of ultra-high moisture inferior lignite in thermal power plants. Through experiments, measures such as increasing the primary air flow rate and increasing the coal powder particle size were adopted to achieve safe and stable operation of the grinding system; through furnace combustion adjustment tests, reasonable operating parameters such as primary and secondary air ratios, exit oxygen levels, and combustion temperatures were determined, achieving safe, stable, and efficient operation of the boiler. Actual operation shows that the technological reliability of the research results effectively improves the reliability of the power plant unit's operation, with significant economic and social benefits.
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