Synergetic treatment of cement production process two points for attention
Date：2019-08-27 17:18 Source：cementepcViews:
The cement industry is facing the crisis of overcapacity, many small and medium-sized cement plants are facing the risk of closure, so cement plants have sought technical improvements.Among many technological improvement routes, the use of cement kilns to jointly dispose waste is a new highlight of energy saving and emission reduction in cement industry.
On the one hand, the large amount of hazardous waste and household waste is produced, and on the other hand, the extensive application of collaborative disposal of cement kilns.It looks like a bright future, but many industry insiders believe that there is still a lot to be improved in terms of technical design, operation management and risk control.
1. There are mature technologies for collaborative disposal of cement kilns
For cement kilns that co-dispose household waste, the larger the size of the kiln, the greater the buffering capacity in the process of waste disposal, and the smaller the impact of the change of waste characteristics on the production of cement kilns, which is more conducive to the co-disposal of solid waste.The principle of co-disposal of household waste by cement kilns is similar to that of waste incineration for power generation, and it is also through high temperature disposal. Compared with the disadvantages of waste incineration, such as dioxin, dust and heavy metal pollution, the co-disposal technology of cement kilns has obvious advantages.The latter USES the high temperature of existing cement production line kiln, the temperature in the kiln is much higher than that in the incineration plant, and all kinds of toxic and harmful organic compounds can be thoroughly decomposed.In addition, cement kilns have special alkaline environment, which can effectively inhibit the emission of acidic substances and control the harmful waste gas such as dioxin.
2. Pay attention to safety issues in the process
Due to the high temperature of the kiln, the gas in the kiln will reach 1000℃~2000℃, which is beneficial to the decomposition of organic matter and dioxins, but also causes a sharp increase in NOX production of thermal type.Especially in the process of hazardous waste disposal, if the equipment used in the treatment is not up to standard, it may cause serious consequences.
In hazardous waste treatment, there are inflammable and explosive materials or materials that produce chemical reactions, which have high requirements for the safety and adaptability of equipment, and it is necessary to fully consider the possible dangerous situations in the process of material treatment.
The design of waste and hazardous waste treatment equipment should fully consider the complexity of waste treatment.First of all, the material of the equipment itself should be very hard.For example, environmental protection in the solid waste crusher cutting tools imported from Europe, ensure reliable quality, not easy to damage, and has a longer wear life, barrels of hazardous waste can be directly broken.Secondly, the drive system must withstand repeated shock loads.If the situation of deflagration really happens, the fire fighting system of the crushing system can eliminate the danger quickly.
3. Pay attention to the control of chlorine content in the treatment process
Because the presence of chlorine affects the quality of cement, the production of cement has strict restrictions on harmful substances such as chlorine in raw materials.Strictly control the content of chlorine in the waste into the kiln to ensure the stable operation of the cement kiln and the quality of cement clinker, and at the same time curb the production of dioxin pollutants.At present, chlorine is a common concern in the cement industry for the management and control of the collaborative disposal of household waste by cement kilns. In the current treatment system, it is difficult to control the content of chlorine from the source, so higher requirements are put forward for pretreatment.
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