A Synergistic Emission Reduction Method for Energy-carrying Composite Gas Media Sintering

Abstract

The invention discloses a method for synergistic emission reduction by sintering of energy-carrying composite gas. The sintering material surface is sequentially divided into an ignition section, a heat preservation section, a middle section, a flue gas heating section and a machine tail section from the head to the tail of a sintering machine. According to the flue gas composition, temperature characteristics and heat demand in different sections, hot waste gas is introduced into the ignition section for ignition, hot waste gas is introduced into the heat preservation section and hydrogen-rich gas is injected in steps synchronously, and the middle section is coupled on the basis of injection of hydrogen-rich gas Water vapor is sprayed in steps to circulate the high-temperature flue gas in the tail section and the flue gas in the ignition section and / or heat preservation section to the heating section. After adopting the energy-carrying composite gas sintering collaborative emission reduction method, it can simultaneously achieve a greater reduction in the consumption of solid fossil fuels in the sintering process and inhibit the formation / decomposition of pollutants to generate pollutants. Compared with conventional air sintering, it can reduce CO emissions. 2 15~25%, CO40~50%, NO X 20-40%, SO X 5-20%, dioxin 50-80%.

Description

technical field [0001] The present invention relates to a sintering method, in particular to a method for synergistic emission reduction using energy-carrying composite gas medium sintering, and in particular to a method for dividing the sintered material surface into sections, and introducing different The energy-carrying gas replaces traditional air so as to realize energy-saving and emission-reduction methods, and belongs to the technical field of iron and steel metallurgy sintering. Background technique [0002] High energy consumption and high pollution are important factors restricting the sustainable development of traditional industries, especially in the iron and steel industry. Iron ore sintering, the front-end process of the iron and steel industry, poses severe challenges to the green manufacturing of the iron and steel industry due to its high energy consumption and heavy pollution load. In the traditional sintering process, solid fossil fuels such as coke and ...

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Problems solved by technology

In addition, literature studies have shown that NO can be reduced during the flue gas circulation process, and the conversion of N elements in solid fuels to NO can be inhibited. X (EliminationBehaviors of NOx in the Sintering Process with Flue Gas Recirculation[J], xiaohui Fan), while dioxins in the flue gas can be thermally decomposed when passing through the combustion layer, and CO can undergo secondary combustion (iron ore sintering smoke SO in gas cycle 2 and NO X Cooperative optimization of process control and energy saving and emission reduction [D], Yu Heng), but whether it is the one-stage cycle of the EOS process, the two-stage cycle of the LEEP process and the EPOSINT process, or the regional exhaust gas circulation process and exhaust gas waste heat cycle Three-stage cycle of the process due to low oxygen content and / or high water content and / or SO in the circulating flue gas 2 The high content has brought certain influence on the sintering process and sinter quality to varying degrees.

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