Flue gas dispersing device for forcibly dispersing powder

Abstract

The invention relates to the technical field of gas-solid heat exchange of preheating and pre-decomposing systems, and particularly discloses a flue gas dispersing device for forcibly dispersing powder. The device comprises a dispersing mechanism, a discharging pipe connected to an inlet of the dispersing mechanism, and a heat exchange pipe communicating with an outlet of the dispersing mechanism, the dispersing mechanism comprises a dispersing shell provided with an inlet and an outlet, and a fan blade type pressure difference generating mechanism mounted in the dispersing shell; the outlet of the dispersing shell communicates with the side wall of the heat exchange pipe to form a dispersion cavity, and the fan blade type pressure difference generating mechanism is located in the dispersion cavity; and a rotating axis of the fan blade type pressure difference generating mechanism and an axis of the heat exchange pipe are not located on the same straight line. The device can enhance the powder dispersing effect, does not additionally consume waste heat of high-temperature flue gas, and can stably and reliably work for a long time.

Description

technical field [0001] The invention relates to the technical field of gas-solid heat exchange in a preheating and pre-decomposing system, and more specifically, relates to a material spreading device for forcedly dispersing material powder by flue gas. Background technique [0002] As an important part of the preheating and pre-decomposition system, the material spreading device plays a vital role in efficiently recovering the waste heat of high-temperature flue gas from the material powder, improving the heat exchange efficiency of the material powder-high-temperature flue gas, and reducing the heat consumption of clinker firing in the cement industry. . [0003] The traditional spreading device is mainly a spreading box (or known as a spreading box), a spreading plate, etc., which are located at the appropriate positions of the heat exchange pipes at the outlet of preheaters at all levels. The basic principles are as follows: figure 2 Shown: Under the action of the compo...

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Problems solved by technology

Or extend the bottom plate into the heat exchange pipe for a certain distance, and design a number of small holes evenly distributed in the protruding part to allow the high-temperature flue gas in the heat exchange pipe to pass through, so as to enhance the dispersion effect of the material powder. The above measures have not changed the material quality. The most fundamental driving force for powder dispersion still comes from the component force of the gravity of the powder itself along the direction of the material pipe, and the buoyancy force of the high-temperature flue gas in the heat exchange pipe to the powder, resulting in the effect of uniform dispersion of the powder in the high-temperature flue gas limited

This fundamentally limits the heat transfer efficiency of powder-high-temperature flue gas, and cannot efficiently recover waste heat from high-temperature flue gas

[0006] (2) Provide a certain flow rate and high flow rate compressed air to the bottom plate of the material spreading box at a suitable angle to enhance the dispersion effect of the material powder in the high-temperature flue gas of the heat exchange pipe. Although this method provides additional material powder dispersion power source, can significantly improve the dispersion effect of the powder, but the temperature of the compressed air is much lower than the high-temperature flue gas, and it will exchange heat with the high-temperature flue gas, thus wasting the heat in the high-temperature flue gas

However, due to the long-term high-speed rotation of the rotating blade and the complete contact with the material powder, rapid wear will inevitably occur, resulting in high failure rates and low operating rates.

[0008] The current technology is difficult to efficiently suspend and disperse the material powder in the high-temperature flue gas through the material spreading device in a stable and reliable manner, so as to greatly improve the convective heat transfer efficiency of the material powder-high-temperature flue gas, thereby achieving efficient recovery of flue gas waste heat and reducing clinker burning. The purpose of heat loss

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