Heat pipe type smoke pulverized coal heating device

Abstract

The invention relates to a heat pipe type smoke pulverized coal heating device which comprises a smoke waste heat recovery unit and a pulverized coal heating unit. The smoke waste heat recovery unit comprises a first housing, a smoke inlet is formed in the top of the first housing, a smoke outlet is formed in the bottom of the first housing, and a group of first transverse heat exchange pipes are supported in the first housing and provided with first working medium inlets and first working medium outlets. The pulverized coal heating unit comprises a heat exchange cavity provided with a second housing, the second housing is provided with a second working medium inlet and a second working medium outlet, the first working medium inlets are communicated with the second working medium outlet, and the second working medium inlet is communicated with the first working medium outlets through pipes. A group of second transverse heat exchange pipes are arranged in the second housing and provided with pulverized coal inlets communicated with distributors in a sealed mode and pulverized coal outlets communicated with collectors in a sealed mode. The heat pipe type smoke pulverized coal heating device can recover waste heat of high-temperature smoke, is used for heating pulverized coal and facilitates energy saving.

Description

technical field [0001] The invention relates to a heat pipe type flue gas pulverized coal heating device, which belongs to the technical field of waste heat recovery and utilization. Background technique [0002] According to the applicant's knowledge, in the production of metallurgical industry, hot air above 1200°C needs to be generated in the metallurgical blast furnace. To reach such a high temperature, fuel with high calorific value is required, and the usual fuel is coke. Coke is produced by coking coal, which is expensive. An effective way to reduce costs is to replace coke with pulverized coal. The coal is ground into coal powder, which is transported into the blast furnace for combustion through compressed gas. [0003] At present, one of the heating methods for spraying pulverized coal into the blast furnace is to add a casing outside the pulverized coal pipe, and to pass high-temperature and high-pressure steam into the gap between the casing and the pulverized ...

AI Technical Summary

Problems solved by technology

The main disadvantage of this heat exchanger is that at the inlet of the heat exchanger, there is a blind area between adjacent heat exchange tubes. When the high-temperature gas containing solid particles enters the heat exchange tubes, the solid particles hitting these blind areas are very difficult Tend to accumulate at the bottom of the heat exchanger inlet due to stall and eventually lead to blockage of the heat exchanger inlet

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