Process of calcining mixed fuel in white cement rotary kiln by using rice hull powder and petroleum coke powder

Abstract

The invention relates to a process of calcining mixed fuel in a white cement rotary kiln by using rice hull powder and petroleum coke powder. The process comprises the following steps: crushing rice hulls to rice hull powder in a crusher, sucking the crushed rice hull powder into a bag type dust collector by an exhaust fan of a petroleum coke grinding system, mixing and collecting the petroleum coke powder entering into the bag type dust collector and feeding the mixture into a mixed fuel cabin, and then, respectively feeding the mixed fuel to a decomposing furnace and a combustor at the head of the rotary kiln to combust; and discharging purified gases to the atmosphere by the exhaust fan through a chimney. The ignition point and burnout temperature of the mixed fuel doped with rice hull powder and petroleum coke powder can be reduced, the incomplete combustion phenomenon of the fuel is greatly reduced, and the calcining heat loss of white cement clinker is remarkably lowered. The white cement clinker is beneficial to calcination due to the characteristics of high heat value and low ash content of petroleum coke, iron pollution brought by ash content can be avoided, and the strength and whiteness of the white cement are facilitated. According to the process, crushed rice hulls can be doped into petroleum coke powder to prepare the mixed fuel, so that the process is suitable for calcining the white cement clinker in a new dry process cement kiln.

Description

technical field [0001] The invention relates to a white cement rotary kiln calcination mixed fuel process, in particular to a white cement rotary kiln calcination mixed fuel process using rice husk powder and petroleum coke powder. Background technique [0002] For a long time, the fuel used for calcining white Portland cement clinker in my country's white cement rotary kiln is bituminous coal. However, the vast southern regions of my country lack high-quality bituminous coal, but there are abundant anthracite reserves. However, due to the high ash content of anthracite, Fe in ash 2 o 3 It will have an adverse effect on the whiteness of cement. Therefore, the selection of white cement calcination fuel has become a difficult problem for white cement enterprises. [0003] Petroleum coke is a coke product obtained by distilling crude oil to separate light and heavy oils, and then transforming heavy oils through thermal cracking and condensation reactions. Most petroleum coke...

AI Technical Summary

Problems solved by technology

However, petroleum coke used as white cement fuel has the disadvantages of high ignition temperature and embers temperature, and slow combustion speed, especially the combustion conditions in the decomposition furnace of the decomposition kiln outside the kiln are poor, and the raw meal needs to absorb a large amount of heat during the decomposition process of calcium carbonate. The combustion of petroleum coke is very unfavorable. Due to the slow heat release rate and fast heat absorption rate, the temperature in the furnace cannot meet the calcination requirements.

Images