A new type of dry process cement kiln preheating predecomposition system and method

Abstract

The invention discloses a novel dry-method cement kiln preheating and precalcining system and method. The system comprises multiple stages of preheaters, wherein an air inlet pipe of each stage of preheater is communicated with an air outlet of the next stage of preheater, the preheaters are sequentially connected in this way until the last stage of preheater, an air inlet pipe of the last stage of preheater is communicated with the top of a calciner, the bottom of the calciner is communicated with a kiln tail smoke chamber, a fine material separating device is mounted at a discharge port at the bottom of at least one of the preheaters except the last stage of preheater, a discharge pipe of each fine material separating device is divided into two ways, one way of each discharge pipe is communicated with the air inlet pipe of the corresponding stage of preheater, and the other way of each discharge pipe is communicated with the air inlet pipe of the next stage of preheater. The system and the method have the benefits as follows: the at least one fine material separating device is additionally mounted below the at least one preheater requiring material separation, and material separation quantities and cycling times can be controlled; the air flow temperature of an outlet of the system can be decreased under the condition that the original preheater stages are not increased; the solid-air ratio can be increased through fine material separation and cycling heat exchange, the heat exchange efficiency is improved, and the yield is increased.

Description

technical field [0001] The invention relates to the technical field of garbage treatment, in particular to a dry-process cement kiln preheating and pre-decomposing system and method. Background technique [0002] At present, the new dry preheating and pre-decomposition technology of cement can be said to have been developed to the extreme, and it is very difficult to further improve the heat exchange efficiency without a substantial increase in investment. [0003] In order to further recover more heat, there are generally two methods for the development of existing technologies. [0004] One method is to increase the number of preheater stages, thereby reducing the exhaust gas temperature at the outlet of the final stage preheater. But there are also many disadvantages. In addition to the increase in system resistance loss, the investment has also increased significantly (mainly used to increase the height of system equipment, increase the civil construction frame, increas...

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Problems solved by technology

However, this method requires more investment, and completely changes the layout and distribution of the existing preheater series. The system is also more complex, and the investment and operation difficulties as well as the failure points will greatly increase. It will be very difficult to transform the existing system. , it is difficult to generalize in practical applications

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