Smokeless coal charging method for eliminating dust and smoke on top of coke oven

Abstract

The invention discloses a smokeless coaling method for eliminating dust and flue gas at the top of a coke oven, which comprises the following steps: 1, when a coaling hole is opened and coaling is started, fully opening a valve body turning plate (3) arranged at the gas collecting pipe side of a bridge pipe (6), and spraying high-pressure ammonia water into an ascending pipe (2) by an ammonia spraying device (7) arranged at the ascending pipe side of the bridge pipe; 2, in the coal charging process, controlling the opening degree of a turning plate of a valve body to regulate the pressure of ammonia water sprayed by an ammonia spraying device, so that the pressure in the ascending pipe is kept negative, and the negative pressure in the coke oven carbonization chamber is kept; 3, after coal charging is completed, spraying, by the ammonia spraying device, low-pressure ammonia water into the ascending pipe, then partially closing the valve body turning plate to maintain the pressure in the gas collecting pipe (1) positive, so that the pressure in the coke oven carbonization chamber is kept positive. According to the invention, the pressure in the furnace can be controlled by effectively adjusting the flow of the raw gas, so that smokeless coal charging is realized; meanwhile, the problems that the raw gas flows back to the carbonization chamber and burns in the carbonization chamber in a normal production state can be prevented, and the release loss of the raw gas is reduced.

Description

technical field [0001] The invention relates to a method for charging coal at the top of a coke oven, in particular to an anthracite coal charging method for eliminating dust and flue gas at the top of a coke oven. Background technique [0002] Blast furnace ironmaking is the mainstream ironmaking process in the world's steel industry. Among them, coke plays an important role as exothermic agent, carbon skeleton, reducing agent, and carburizing agent in the blast furnace for producing molten iron. Coke is mainly produced by pyrolysis of coal under the condition of high temperature and air isolation. Most coke production uses top-mounted vertical coke ovens, and adopts conventional coking processes or a combination of coal humidity control and conventional coking processes. Since the carbonization chamber is at 1000 ° C When the coal enters the carbonization chamber, under the action of the extremely high temperature and the buoyancy of the heat flow, a large number of small ...

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Problems solved by technology

[0006] Although the above-mentioned patents and patent applications can suppress the release of smoke and dust to a certain extent during the coal charging process, they cannot avoid the release of toxic gas from the top of the coke oven. Even if the toxic gas is burned, it will still cause gas release after combustion and environmental pollution. problems, and it is impossible to effectively recover the raw gas released from the furnace top, resulting in great loss and waste of raw gas

In the later stage of coking when the coke cake is about to mature, the negative pressure in the lower part of the coke oven is caused by the reduction of raw gas production in the furnace, which in turn leads to the backflow of raw gas and partial burning loss

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