Composite pre-heater

Abstract

The invention discloses a composite pre-heater, which directly carries out heat exchange and reaction separation between high-temperature gas and low-temperature materials. The composite pre-heater comprises a partial cone chamber (1), a spurting chamber (2) and a separator (4), wherein the lower end of the partial cone chamber (1) is provided with a hot gas inlet, one side of the partial cone chamber (1) is provided with a material spreading valve (6), an opening of the upper end of the partial cone chamber (1) is fixedly connected with an opening of the lower end of the spurting chamber (2), an opening of the upper end of the spurting chamber (2) is fixedly connected with an opening of one side of the separator (4) through a pipeline, a material spreading plate (3) is arranged on the pipeline, the upper part of the material spreading plate (3) is provided with a material inlet, the upper end of the separator (4) is provided with a gas out let, the opening of the lower end of the separator (4) is fixedly connected with the material spreading valve (6) arranged on the partial cone chamber (1) through a pipeline, and a wind locking valve (5) is arranged on the pipeline. Through the partial cone structure, the invention reaches the multidirectional suspension rotation and spurting, and high-temperature materials can not scar and can not be blocked. In the suspension state, the materials have long dwell time through spurting and rotating, and the heat exchange efficiency is high.

Description

Technical field [0001] The invention relates to a gas-solid and liquid-solid heat exchange reaction device, in particular to a composite preheater for direct heat exchange and reaction separation between high temperature gas and low temperature material. Background technique [0002] In cement, chemical and metallurgical production equipment, a device for efficient heat exchange between gas and solid is often required, and equipment with low resistance, no scarring, no clogging, and easy separation of gas and solid, such as a commonly used vertical tube preheater , Cyclone preheater, etc. [0003] Due to its simple structure and low gas ventilation resistance, the vertical tube preheater is suitable for raw materials with high alkali, chlorine and sulfur content. It is not easy to block and does not need bypass; there is no expansion and contraction connection problem, and the amount of air leakage is small; the vertical tube is self-supporting Structure, so the civil construction...

AI Technical Summary

Problems solved by technology

However, the vertical preheater has great disadvantages in terms of thermal engineering: in the vertical preheater, the material and the air flow mainly conduct countercurrent heat exchange, and the material is both dispersed and aggregated in each bowl in the vertical cylinder, so Repeated circulation, satisfying heat exchange and countercurrent movement, because the separation efficiency of the vertical cylinder itself is low, it is generally installed in the upper part of the cyclone in series, and the thermal efficiency of the vertical cylinder preheater is much lower than that of the cyclone preheating due to poor material dispersion Therefore, in the international market, the vertical tube preheater was gradually eliminated

[0004] Most of the cyclone preheaters currently used in China have relatively low preheating efficiency, and the decomposition rate of calcium carbonate in the kiln material is only about 30%, which affects the kiln production capacity

In the five-stage cyclone preheater of the prior art, there is a columnar ascending flue between the tail smoke chamber of the cyclone cellar and the final cyclone tube. This structure leads to poor preheating effect of the cyclone preheater. The decomposition rate of materials entering the kiln cannot meet the requirements. Generally, the output of a five-stage cyclone preheater with a production capacity of 12.5t / h is only about 10t / h; the output of a kiln with a production capacity of 25t / h is only 21t / h around

Therefore, it not only affects the output of the kiln, but also increases the energy consumption.

This five-stage cyclone preheater technology has high plant building, high resistance, easy to clog and scarring, strict requirements on raw material alkali, chlorine and sulfur content, high investment and power consumption

[0005] The rotary dryer is a running equipment. When drying the material, the material is lifted by the internal lifting plate, forming a material curtain on the cross section of the dryer, and exchanging heat with the incoming hot air. The heat exchange efficiency is low, and it is easy to scar. Moreover, the diameter and length of the dryer are large, the investment is high, and the volume output is low

Because it is a running equipment, the air leakage is high, the heat dissipation loss is large, and the power consumption is high

[0006] They are not optimal in terms of resistance, energy consumption, efficiency, and investment

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