Oxygen coal spray gun nozzle combining device

Abstract

The invention discloses an oxygen coal spray gun nozzle combining device, which comprises an oxygen coal spray gun, a blowing-in device and a nozzle component. The nozzle component is provided with a crosswise communicated containing cavity and a cooling water channel is arranged in the side wall of the nozzle component, wherein the containing cavity of the nozzle component is divided into a first channel and a second channel by a laterally arranged baffle wall; the oxygen coal spray gun is plugged in the first channel; at least one part of the oxygen coal spray gun is contacted with the sidewall of the nozzle component; and the blowing-in device is plugged in the second channel. The oxygen coal spray gun of the invention comprises a coal spray gun body and a fixed casing pipe, wherein aguiding sleeve, which has a coal powder slot and a plurality of helical air channels, is arranged outside of the nozzle of the coal spray gun body. The invention can efficiently promote the cooling effect, prolong the service life of the device and increase the coal powder burning efficiency and the running safe reliability of the device.

Description

technical field [0001] The invention relates to an oxygen-coal spray gun tuyere combination device in a blast furnace ironmaking process, in particular to an oxygen-coal spray gun tuyere combination device capable of combining an oxygen-coal spray gun of a coal injection system in a blast furnace with a tuyere component of a furnace body system. Background technique [0002] In the blast furnace ironmaking process, coal injection guns are usually used to provide pulverized coal for the combustion system of the blast furnace, and the pulverized coal and air are mixed and burned in the furnace to provide heat for the blast furnace. At present, the existing coal injection guns can be divided into single-tube spray guns, air-cooled spray guns and oxygen-coal spray guns according to different structures, specifically: [0003] 1. Single tube spray gun, please refer to figure 1 , is a structural schematic diagram of an existing single-tube spray gun. Such as figure 1 As shown, ...

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Problems solved by technology

But it also has some deficiencies: first, because the existing oxygen-coal spray gun only uses gas flow to cool, and the heat exchange amount of the air flow is small, so the cooling effect of the oxygen-coal spray gun is still not ideal, and the temperature of the coal spray gun body is relatively high. High, easy to damage, resulting in a shorter service life of the spray gun; secondly, because the outlet of the coal spray gun body of the oxygen-coal spray gun is impacted by the air flow, the outlet of the coal spray gun body is severely worn, which further shortens the service life of the spray gun. Thirdly, when the pulverized coal injected directly through the oxy-coal spray gun is mixed with oxygen, the mixing uniformity is low, which makes the pulverized coal burn insufficiently and reduces the combustion efficiency of pulverized coal; in addition, due to the high purity of oxygen, the There are certain safety hazards during combustion, which affects the safety and reliability of the equipment, and coal injection is required to pull the gun body out of the sleeve during maintenance, which is prone to hot air backflow

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