How to reduce energy consumption of active lime kiln? -Henan Red Star


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How to reduce energy consumption of active lime kiln?

Application of rotary kiln in active lime production At present, many manufacturers choose to use the rotary kiln system to produce active lime, because the system has high output, good quality and stability, but there is a problem of high energy consumption. In order to improve the production efficiency, it is necessary to take effective measures to reduce the energy consumption of the system. stay Active lime kiln The heat loss is mainly waste gas from preheater outlet, heat dissipation from rotary kiln shell and waste heat taken by cooler discharge. Therefore, to reduce the system energy consumption, we can start from these three main aspects.

 Rotary kiln

1. For the exhaust gas discharged from the preheater outlet, it is a proportion of various heat losses. Therefore, it is very important to reduce the energy consumption of the whole system to reduce the exhaust gas temperature at the preheater outlet. The specific measures to reduce the exhaust gas temperature at the outlet of preheater are as follows: strictly control the quality of raw materials, reduce the influence of various impurities on the calcination process; optimize the internal structure of the preheater, and strengthen the heat conduction between the flue gas and the material of the preheater.

2. The heat loss of rotary kiln shell is about 12% of the total energy consumption. The main measures to reduce the heat loss of the cylinder body are: popularizing the use of high-performance fire-resistant, wear-resistant and heat-insulating materials in the cylinder to reduce the heat loss from the kiln body; improving the operation efficiency of the equipment and reducing the standby time of the equipment.

3. The specific measures to reduce the discharge temperature of the cooler and increase the secondary air temperature of the kiln inlet are as follows: strengthen the system operation, control the overall discharge volume, coordinate and control the discharge amount of each unloader according to the material distribution in the cooler; maintain the thickness of the material layer in the cooler and control the uniform distribution of the overall material layer, i.e., taking thick material layer operation; timely Large pieces of debris falling into the cooler (such as the fragments of kiln shell and ring burst) to prevent short circuit of cold air.

 Rotary kiln

In addition to the above methods, the energy consumption of the system can be reduced from the aspects of rational utilization of primary and secondary air, utilization of waste heat and reduction of air leakage. If the primary and secondary air are reasonably used, more secondary air should be used and less primary air should be used. That is, under the condition of meeting the normal use of burners, the proportion of primary air should be reduced as far as possible, and the secondary air should be fully utilized to improve energy utilization and reduce energy consumption.

In terms of waste heat utilization, a new type of heat exchanger can be set in the limestone flue gas treatment system to preheat the gas or air through the new heat exchanger. This has a significant effect on reducing the energy consumption of the system. In addition, it is very important to keep the temperature of preheating air and gas. In order to save the heat from preheating, the length of hot air pipe should be shortened as far as possible to ensure the sealing of flange, and the hot air pipe should be insulated and wrapped.

In terms of reducing the system air leakage, according to the type of rotary kiln, the kiln head and kiln tail sealing devices with good sealing performance are selected; the ventilation pipelines and flanges in the system are regularly overhauled and maintained to prevent the pipeline or flange from being damaged due to poor maintenance management; the observation holes and inlet holes in the system are kept closed.

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