Research on Key Technology of Large-ratio Blending Blast Furnace Gas Boiler
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Abstract
The situation of rebuilding and expanding iron and steel bases has been existed in domestic steel corps at present. The captive power plants need to maximize the blending of blast furnace gas in order to achieve near-zero-emission of BFG. The research is based on the Baosteel Guangdong Zhanjiang Iron and Steel Base Captive Power Plant 2×350 MW Units Project. Through analysis, calculation and comparison, the large-ratio blending BFG subcritical boiler of 300 MW grade has been developed, as well as corresponding system, such as flue gas system, pulverizing system and flue gas desulfurization system. The results show that the performance indexes of the unit have been equal to or better than the design values since the operation. The maximum blending BFG ratio of each boiler is 30% when Baosteel base reaches the production capacity of 10 million tons, which is the maximum ratio of blending BFG in China. It is built to solve the problem of environmental pollution, to reduce energy consumption and the cost of captive power plant of steel corps. Thus, the research has high application promotion value and provides significant guidance for future projects.
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