System for drying and decomposing wet acetylene sludge and firing cement clinker by using wet acetylene sludge as calcium raw material

A calcareous raw material, wet carbide slag technology, applied in cement production, clinker production and other directions, can solve problems such as increasing the decomposition heat consumption of the decomposition furnace system

Active Publication Date: 2014-07-16
NANJING KISEN INT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in the process of drying wet carbide slag with kiln exhaust gas, Ca(OH) 2 With the high concentration of CO in the flue gas 2 Synthetic CaCO 3 , the synthesis of CaCO 3 Reoccurrence of CaCO in the calciner of the cement kiln system 3 decomposition, correspondingly increasing the decomposition heat consumption of the calciner system

Method used

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  • System for drying and decomposing wet acetylene sludge and firing cement clinker by using wet acetylene sludge as calcium raw material
  • System for drying and decomposing wet acetylene sludge and firing cement clinker by using wet acetylene sludge as calcium raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] like figure 1 , a system for drying and decomposing wet calcium carbide slag and firing cement clinker as a calcareous raw material, including a clinker cooler 1, a rotary kiln 2, a kiln head cover 3, a tertiary air duct 4, a manifold 5, a drying Crusher 6, powder separator 7, cyclone dust collector 8, exhaust gas fan 9, calciner 10, preheater system 11, calciner fuel injection system 12, dust collector 13, fan 14, chimney 15, regulating valve 16. Regulating valve 17, the hot gas extracted from the clinker cooler 1 and or the kiln head cover 3 is mixed in the air manifold 5 and then enters the drying crusher 6, and is exchanged with the wet electricity slag fed to the drying crusher 6 After heating, it enters the bottom of the calciner 10 after passing through the powder separator 7, the cyclone dust collector 8 and the waste gas blower 9, and is used for fuel combustion in the calciner 10; It is directly fed into the calciner 10 alone, and the calcium hydroxide is dec...

Embodiment 2

[0026] If the calcareous raw material is calcium carbide slag, the wet calcium carbide slag is dried by hot air at the kiln head, and after powder selection, it is directly fed into the calciner 10 separately, and the non-carbide carbide raw material powder is preheated by the preheater system 11 and then enters the calciner. Mix and decompose with dry calcium carbide slag powder in the calciner and then enter the rotary kiln 2 to burn into cement clinker. In order to ensure that calcium hydroxide and other calcium raw materials (such as limestone) in the calcium carbide slag are completely decomposed , The outlet gas temperature of the decomposition furnace 10 is controlled above 850° C., and other implementation processes are the same as in Example 1.

Embodiment 3

[0028] Tertiary air pipe 4 is provided with control valve 18, see figure 2 , according to the moisture content of calcium carbide slag and the amount of mixing in ingredients, the amount of hot air for drying calcium carbide slag and the fuel combustion of the calciner are controlled by adjusting the control valve 18. The opening of the control valve 18 is adjusted to 0-100%. Easy to burn, the control valve 18 of the tertiary air pipe 4 can be completely closed, and the tertiary air extracted from the kiln head cover 3 is all improved into the drying crusher 6, and other implementation processes are the same as in embodiment 1.

[0029]If the wet calcium carbide slag has a large amount of moisture after press filtration and there is a large amount of mixing in the ingredients, the amount of hot air drawn by the clinker cooler 1 and or the kiln hood 3 is not enough for drying the wet carbide slag, and other preheated air can be added to enter the drying process. The dry crushe...

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Abstract

The invention provides a system for drying and decomposing wet acetylene sludge and firing cement clinker by using the wet acetylene sludge as a calcium raw material. The system is characterized in that hot air drawn off from a clinker cooler and/or a kiln head cover is mixed in an air collecting pipe, then enters a drying crusher, exchanges heat with the calcium raw material fed into the drying crusher, finally passes through a powder concentrator, a cyclone dust collector and an exhaust gas draught fan and enters the bottom of a decomposing furnace for burning of fuel in the decomposing furnace; the calcium raw material is dried by hot air in a kiln head and subjected to powder concentration, then is directly and separately fed into the decomposing furnace and decomposed in the decomposing furnace, and finally is converged with non-calcium raw material powder preheated by a preheater system in the decomposing furnace, the calcium raw material and the non-calcium raw material powder enter a rotary kiln together so as to fire the cement clinker, and all the calcium raw material is the wet acetylene sludge. The system has the advantages that the wet acetylene sludge and the carbon dioxide reaction mechanism are fully combined, hot air mainly comprising nitrogen and oxygen is used as a drying hot source, and the acetylene sludge and the carbon dioxide are effectively prevented from being synthesized into calcium carbonate, so that the decomposition temperature and decomposition heat of calcium hydroxide are reduced.

Description

technical field [0001] The invention relates to a system for firing cement clinker with wet calcium carbide slag as a calcareous raw material, in particular to a cement clinker firing system for drying wet calcium carbide slag with high-temperature waste gas without or less acidic components such as carbon dioxide. Background technique [0002] Carbide slag is the industrial waste residue produced by the acetylene method in the coal chemical industry to produce resins such as PVC and PVA. The main component is Ca(OH) 2 In the production process, there are two discharge methods: dry discharge and wet discharge. The moisture content of wet discharge carbide slag is 90~92%. After advanced physical dehydration methods such as pressure filtration, the water content can be reduced to about 25%. CaO in carbide slag The content is very high (above 60%), and it is a high-quality calcareous raw material for the cement industry to replace limestone to produce cement clinker. The partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/43C04B7/38C04B7/24
CPCY02P40/10Y02P40/121
Inventor 康宇陈艳征李安平罗超柴晓东
Owner NANJING KISEN INT ENG
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