Large-temperature-difference crossed material preheating and precalcining system and method thereof

Abstract

The invention relates to a large-temperature-difference crossed material preheating and precalcining system, which comprises a cyclone preheater system, a calciner system and a feed-end chamber. The cyclone preheater system comprises N stages of cyclone cylinders; the other cyclone cylinders except for the N stage of cyclone cylinder comprise material distribution valves; the first stage to the N-2 stage of cyclone cylinders respectively feed parts of materials in blanking holes through the material distribution valves into the cyclone cylinders in the lower stages, and feed the other parts of materials into cyclones cylinders with higher flue-gas temperature compared with the cyclone cylinders in the lower stages or the calciner system, so that the gas-solid temperature differences in the cyclone cylinders and the calciner system are increased. The invention further relates to a large-temperature-difference crossed material preheating and precalcining method. The raw material heat exchange efficiency is improved, the system waste gas temperature is reduced, and the raw material decomposition rate is improved. The large-temperature-difference crossed material preheating and precalcining system and the large-temperature-difference crossed material preheating and precalcining method provided by the invention are applicable to the establishment of a cement preheating and precalcining system and the improvement of an existing cement preheating and precalcining system, and also can be applied to a powder heat exchange system in the industries of metallurgy, chemical engineering and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal equipment in the cement industry, and in particular relates to a large temperature difference cross material flow preheating and pre-decomposing system and a method thereof. Background technique [0002] At present, the new dry process cement is developing rapidly and energy is in short supply. It is imperative to use low-priced low-quality bituminous coal or anthracite as the fuel for cement clinker calcination. Harmful components of raw fuel in the production of new dry process cement will cause damage such as crusting in the calciner, resulting in a reduction in clinker production and system operation rate. As the core equipment of the calciner, how to rationally arrange and match the air, coal, and materials in it, so that the fuel can be stably and completely burned in the calciner with a high concentration of raw materials, so that the temperature field in the furnace is uniform, no local hi...

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Problems solved by technology

[0003] There are some inherent problems in the existing high-solid gas preheating decomposition technology. For example, the use of a double-series preheater system will make the structure complex, with many cyclones, large heat loss, and high power consumption of the fan. It is not suitable for small-scale It is used in cement production line; it is sensitive to coal quality, so it is difficult to adapt when using low-quality coal or anthracite as fuel; and it cannot adapt to the natural environment in high altitude areas, and it is difficult to achieve its corresponding technical indicators on a single series preheater

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