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Method for producing portland cement clinker using domestic waste flying ash

A technology of domestic waste incineration and Portland cement, applied in cement production and other directions, can solve the problems of secondary pollution, high treatment cost and high treatment cost, and achieve the effects of saving production cost, wide application range and low treatment cost.

Inactive Publication Date: 2009-03-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that high temperature melting consumes more energy and the processing cost is more expensive.
However, there are two problems in this method: (1) The cement clinker produced has a lower firing temperature than silicate clinker. Because the clinker contains higher chlorine and sulfur, its application range is limited to a certain extent, and it is not suitable for application. (2) The production process of this type of cement is not indicated
[0008] Generally speaking, the current disposal of fly ash is still in the stage of harmless treatment, and the treatment cost is high, and the risk of potential secondary pollution still exists; the product application range of resource utilization technology is relatively narrow, or the investment is relatively low. Big

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  • Method for producing portland cement clinker using domestic waste flying ash
  • Method for producing portland cement clinker using domestic waste flying ash
  • Method for producing portland cement clinker using domestic waste flying ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Co-processing in the new dry process kiln production line with double series (kiln train and furnace train) five-stage suspension preheater and FLS spouting type calciner with Φ4.75×75 meters, Guangzhou Likeng waste incineration power plant Fly ash test. The calciner, 5-stage cylinder, kiln tail smoke chamber and smoke chamber ascending flue of the cement kiln are all designed with dust cleaning holes, air cannons and manual cleaning operation platforms. In this embodiment, on the basis of the existing production line, a fly ash sealed storage bin similar to the pulverized coal bin structure and a separate metering device are added near the kiln head coal powder bin. The position (temperature range is 850°C ~ 950°C) has added a bypass air release device. The device is connected with the ascending flue at the end of the kiln through a controllable valve, and is equipped with a coarse powder classifying cyclone, a bag filter and an exhaust fan. Open the valve to make pa...

Embodiment 2

[0029] The basic situation and transformation of the kiln, the storage and feeding methods of fly ash, and the quality level of coal powder are the same as those in Example 1. The amount of fly ash added is 0.34% of the white raw meal, that is, the amount of fly ash sprayed from the kiln head per hour. Ash is 1.08-1.11 tons. Since the fly ash needs to be preheated and the decomposition reaction of some substances needs to absorb heat, in order to maintain the temperature of the firing zone at 1250 ° C ~ 1450 ° C, the proportion of coal used in the kiln head injection is adjusted from 38% when no fly ash is burned to 40%, the length of the firing zone is 24 meters, the temperature of the kiln tail smoke chamber is 1050°C-1150°C, the outlet temperature of the calciner is 870°C-920°C, and the outlet temperature of the first-stage cylinder is about 320°C-340°C. In order to maintain the normal operation of the kiln, the resistance of the high-temperature fan is basically unchanged....

Embodiment 3

[0031] The basic situation and transformation of the kiln, the storage and feeding methods of fly ash and the quality level of coal powder are the same as those in Example 1. Ash is 1.62-1.65 tons. Since the fly ash needs to be preheated and the decomposition reaction of some substances needs to absorb heat, in order to maintain the temperature of the firing zone at 1250 ° C ~ 1450 ° C, the proportion of coal used in the kiln head injection is adjusted from 38% when no fly ash is burned to 41%, the length of the firing zone is 24 meters, the temperature of the kiln tail smoke chamber is 1050°C-1150°C, the outlet temperature of the calciner is 870°C-920°C, and the outlet temperature of the first-stage cylinder is about 320°C-340°C. The workload of manually cleaning the smoke chamber and the skinning of the ascending pipe is 2 times / 8 hours, the frequency of using the air cannon is 4 hours once, and the bypass air is used for 10-20 minutes each time, and the frequency of use is ...

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Abstract

The invention relates to a method for producing Portland cement clinker with incineration slag of municipal solid waste. The method solves the problem of crust and blockage caused by chlorine through the reconstruction of the prior kiln which is realized by mounting a by-way air exhaust device. For a kiln system with a kiln row and a furnace row which are independent from each other, the by-way air exhaust device is arranged in an uptake of a kiln end gas chamber in the kiln row close to a five-stage cylinder; while for common industrial kiln, the air exhaust device is arranged between an outlet of decomposing furnace and an inlet of the five-stage cylinder or arranged at an uptake of an outlet of the five-stage cylinder; the fly ash passes through a kiln head, the kiln end gas chamber, or the decomposing furnace and then is sprayed into the kiln. The use frequency of the by-way air exhaust device is between once per four hours and once per three days, the temperature of the air entering the by-way air exhaust device is controlled to be more than 950 DEG C. the method has the advantages of small reconstruction investment, low treatment cost, production of Portland cement clinker having wide application range and meeting JC / T853-1999 standards of Portland Cement Clinker, realization of reclamation, contribution to the development of cyclic economy, and reduction in consumption of natural resources and energy of the cement industry.

Description

technical field [0001] The invention relates to a production method of silicate clinker, in particular to a method for producing silicate clinker by using domestic waste incineration fly ash, which belongs to the field of circular economy technology and environmental protection technology. The method is harmless through dry-process cement kiln synergy Chemically dispose of domestic waste incineration fly ash. Background technique [0002] With the development of my country's economy and the improvement of people's living standards, the amount of municipal solid waste has also increased dramatically. For our country and even the whole world, a large amount of household garbage has become a long-term source of pollution in cities. These garbage piles up into mountains and occupy a large amount of land. Long-term open-air stacking has caused obvious threats and harm to the atmospheric environment, groundwater and soil. Domestic waste incineration technology can reduce the vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28
CPCC04B7/26Y02P40/10C04B7/44
Inventor 吴笑梅樊粤明林永权
Owner SOUTH CHINA UNIV OF TECH
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