Whole body double-sided flame-insulated heating rotary kiln and method for producing direct reduced iron and co-producing carbon-based fertilizer

Abstract

The invention relates to a whole-body double-sided flame-separated heating rotary kiln and a method for producing direct reduced iron and co-producing carbon-based fertilizer. The rotary kiln cylinder body designed in the present invention is designed as an outer cylinder and an inner cylinder, and a deep reduction chamber is formed between the outer cylinder and the inner cylinder, which is divided into 6 to 12 deep reduction chambers by supporting partitions. The same amount of reduced materials can be filled in the deep reduction chamber of the deep reduction chamber, the filling rate is increased by 6 to 12 times, and the direct reduced iron production capacity of the rotary kiln is also increased by 6 to 12 times, which greatly increases the production capacity of the kiln, and is also relatively The specification of the kiln is reduced, and the investment of the kiln is relatively greatly reduced. Biomass materials such as straws other than coal can be used as reducing agents, which solves the environmental pollution caused by the incineration of biomass materials, turns waste into treasure, and simultaneously recovers high-concentration gas and co-produced bio-carbon-based fertilizer by-products, and realizes Energy saving, emission reduction and carbon reduction, and does not produce NOx.

Description

technical field [0001] The invention belongs to the field of metallurgical equipment and agricultural technology, and in particular relates to a whole-body double-sided flame-insulated heating rotary kiln and a method for co-producing carbon-based fertilizer by direct reduction of iron. Background technique [0002] Crop straw is an excellent biomass energy, and it has a large output every year. In recent years, during the summer harvest and autumn and winter, there are always a large amount of wheat, corn and other straws burned in the field, which produces a lot of thick smoke. Not only It has become the bottleneck of rural environmental protection, and even the chief culprit of the urban environment. Crop straw has become a new source of pollution in rural areas. As a large agricultural country, our country can generate more than 700 million tons of straw every year, which has become "waste" that is "not very useful" but must be disposed of. If it is completely handled b...

AI Technical Summary

Problems solved by technology

However, my country's current direct reduced iron technology is relatively lagging behind. The annual output of reduced iron is less than 600,000 tons, accounting for less than 1% of the world's total output of reduced iron.

[0020] In the existing external heating (flame separation) rotary kiln in the market, due to the supporting device of supporting ring and supporting wheel in the middle of the kiln, only the supporting ring and supporting wheel can be left in the heating furnace, and the high temperature section of the kiln is disconnected. , cannot be heated for a long distance, and the temperature curve is wavy, forming a segmented external heating (flame-type) rotary kiln heating furnace. Therefore, the scale of the kiln is small, the reduction temperature is low, and the temperature in the high-temperature zone is discontinuous and unstable , it is impossible to realize the long-distance heating of the rotary kiln, the reduction kiln is short, the production capacity is low, the temperature curve fluctuates greatly, and it cannot meet the requirements of reduced iron for the continuity and stability of the reduction temperature, and can only be used on a small scale for chemical industry, non-ferrous precious metals, etc. Industries with less processing capacity cannot satisfy the application and development in the field of reduced iron

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