Through research and analysis of the active components of the purge gas and the changes in the combustion of the fluidized bed boilers, the Yannan Lunan Fertilizer Plant has successfully realized the purging of gas in the production of circulating fluidized bed boilers and explored a chemical production process. The exhaust gas produced in the safe and stable combustion process in circulating fluidized bed boilers. As of last weekend, its fluidized-bed boiler with bleed-off gas was burned to reduce steam coal consumption by 15 kg/t or more, carbon content in fly ash reached 0.5% or less, boiler thermal efficiency reached 89% or more, and continuous boiler operation reached 256 days. The highest level.
According to Du Yanwen, director of the Lunan Fertilizer Plant of Yankuang Minerals Co., Ltd., the leading product of the project is methanol and urea. During the production process, a large amount of synthetic exhaust gas is generated, which is the release of scavenging gas. The main component is methane. Other greenhouse gases. In addition, all of the boilers in use at Luhua are circulating fluidized bed boilers. The boiler has a thick material layer and the boiler flue gas has a high oxygen content, which easily causes heat loss. The industrial application of the technology for circulating fluidized bed boilers with sag and bleed air has successfully recovered the bleed air produced in the chemical production process to the boiler for combustion, which not only protects the environment, but also effectively improves the thermal efficiency.
Du Yanwen said that during the implementation of the project, in accordance with the initial design and implementation plan, the boiler with the bleed air directly used the top outlet of the furnace door, the injection angle is still in the direction of the secondary air, and the operating effect clearly shows the fluctuation of the temperature. It is relatively large and the carbon content in the slag has risen significantly. They analyzed that the injection direction of methane was not correct and caused the increase of temperature, and the methane nozzle was re-determined according to the movement direction, force and gas flow analysis of the coal combustion field in the furnace and the running direction of the particles in the furnace. The position and injection angle were adjusted using the opportunity to stop the furnace overhaul. The results show that the temperature of the furnace is uniform and the wear is reduced. In addition, with adequate combustion, the carbon content of the flue gas fly ash is also significantly reduced under a given amount of coal to be burned. Finally, energy saving and emission reduction are realized.
According to Du Yanwen, director of the Lunan Fertilizer Plant of Yankuang Minerals Co., Ltd., the leading product of the project is methanol and urea. During the production process, a large amount of synthetic exhaust gas is generated, which is the release of scavenging gas. The main component is methane. Other greenhouse gases. In addition, all of the boilers in use at Luhua are circulating fluidized bed boilers. The boiler has a thick material layer and the boiler flue gas has a high oxygen content, which easily causes heat loss. The industrial application of the technology for circulating fluidized bed boilers with sag and bleed air has successfully recovered the bleed air produced in the chemical production process to the boiler for combustion, which not only protects the environment, but also effectively improves the thermal efficiency.
Du Yanwen said that during the implementation of the project, in accordance with the initial design and implementation plan, the boiler with the bleed air directly used the top outlet of the furnace door, the injection angle is still in the direction of the secondary air, and the operating effect clearly shows the fluctuation of the temperature. It is relatively large and the carbon content in the slag has risen significantly. They analyzed that the injection direction of methane was not correct and caused the increase of temperature, and the methane nozzle was re-determined according to the movement direction, force and gas flow analysis of the coal combustion field in the furnace and the running direction of the particles in the furnace. The position and injection angle were adjusted using the opportunity to stop the furnace overhaul. The results show that the temperature of the furnace is uniform and the wear is reduced. In addition, with adequate combustion, the carbon content of the flue gas fly ash is also significantly reduced under a given amount of coal to be burned. Finally, energy saving and emission reduction are realized.
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