Working Principle of the Powder Injection Tank (Pulverized Coal Injection Tank)
Working Principle of the Injection Tank (Pulverized Coal Injection Tank) The core function of the injection tank is to convert "solid pulverized coal" into "transportable gas-solid two-phase flow". Its working process revolves around four links: "coal loading - pressurization - fluidization - injection", as detailed below: 1. Coal loading link: The pulverized coal sent from the pulverizing system is loaded into the tank through the upper feed valve (bell valve). The coal loading amount is monitored by the level gauge inside the tank, and the feed valve is closed when the set level is reached. 2. Pressurization link: Compressed air is introduced into the tank to raise the pressure inside the tank to the pressure required for injection (usually matched with the blast furnace hot blast pressure). 3. Fluidization link: The fluidization device (fluidized bed + fluidization nozzle) is turned on. Compressed air enters the tank through a porous plate or nozzle, making the bottom pulverized coal "fluidized" (similar to the flow state of a liquid), eliminating the bridging and accumulation of pulverized coal and ensuring uniform output. 4. Injection link: The discharge valve is opened, and the fluidized pulverized coal enters the self-mixer under the action of the pressure in the tank. After mixing with secondary compressed air, it is sent to the lance through the coal conveying pipeline and finally injected into the tuyere of the blast furnace. Key Design Highlights: By setting "fluidization nozzles" in the conical lower head, the fluidization effect of pulverized coal is further optimized through the agitation of air flow. It is not only suitable for new systems, but also can be used for the transformation and upgrading of existing injection tanks to improve transportation stability.
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