Seven-stage preheating system for cement kiln tail and work method

Abstract

The invention relates to the field of cement firing equipment, in particular to a seven-stage preheating system for a cement kiln tail and a work method. The system comprises a C1-stage cyclone cylinder, a C2-stage cyclone cylinder, a C3-stage cyclone cylinder, a C4-stage cyclone cylinder, a C5-stage cyclone cylinder, a C6-stage cyclone cylinder, a C7-stage cyclone cylinder, air pipes, dischargingpipes and a decomposing furnace which are arranged from top to bottom. An air outlet is formed in the top of each cyclone cylinder, and an air inlet is formed in the side portion of each cyclone cylinder. In every two adjacent cyclone cylinders, the air inlet of the last stage of cyclone cylinder is connected with the air outlet of the next stage of cyclone cylinder through the corresponding airpipe. All discharging ports are connected with the discharging pipes. The discharging pipe of any of the C1-stage cyclone cylinder, the C2-stage cyclone cylinder, the C3-stage cyclone cylinder, the C4-stage cyclone cylinder and the C5-stage cyclone cylinder communicates with the air pipe between the two stages of cyclone cylinders behind the cyclone cylinder. The decomposing furnace is arranged below all the cyclone cylinders, and a smoke chamber communicating with a rotary kiln is further arranged below the decomposing furnace. The system further comprises a high-temperature draught fan and araw material feeding pipe. By means of the system, the temperature of waste gas of an uppermost stage of preheater can be reduced to 220 DEG C to 240 DEG C, heat brought by waste gas is greatly reduced, and heat losses of a firing system are reduced.

Description

technical field [0001] The invention relates to the field of cement firing equipment, in particular to a seven-stage preheating system and working method at the end of a cement kiln. Background technique [0002] In the past two decades, the new dry process cement production technology represented by pre-decomposition technology has been widely used in my country. So far, cement precomposition technology is not only a relatively mature technology, but also a constantly developing technology. The kiln tail preheating system is the key equipment that determines the heat consumption of the cement production line. In terms of the number of stages of the preheater, the current domestic technology is mainly a five-stage preheater system. Usually, the exhaust gas temperature of the uppermost preheater discharged from the five-stage preheater system at the end of the firing kiln is mostly at 310-350°C. If there is no waste heat power generation system, and the raw material uses a ...

AI Technical Summary

Problems solved by technology

In this way, not only the large amount of enthalpy of the exhaust gas at the kiln tail has not been effectively utilized, but also a waste of water resources

The exhaust gas temperature of the uppermost preheater discharged from the six-stage preheater system at the end of the firing kiln is mostly 250-280°C, and there is also a certain amount of energy waste

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