Flue gas improvement measures for zinc oxide desulfurization system of rotary kiln Henan Hongxing

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Flue gas improvement measures for zinc oxide desulfurization system of rotary kiln

with Rotary kiln The main zinc oxide desulfurization system adopts two-stage kinetic energy wave desulfurization reaction system. Up to now, no equipment pipeline blockage has occurred. The system operates stably without secondary pollution. The desulfurization efficiency of a single desulfurization tower is higher than 95%, the total desulfurization efficiency is more than 99.75%, and the concentration of SO2 discharged from tail gas is less than 200mg / m3. The multi-stage horizontal analytical kettle can meet the production requirements, complete reaction and good air tightness. The concentration of flue gas from acid making can reach 10%, which can increase the acid production of the acid making system by 1700t / A, and supplement the zinc metal amount of the zinc system by 5000t / A.

 Rotary kiln

(1) After the zinc oxide desulfurization system of rotary kiln is put into operation, it is found that the concentration of SO2 in the tail gas of rotary kiln is still high after passing through two-stage kinetic energy desulfurization tower, so it is difficult to discharge the flue gas up to standard. It is found that the desulfurization efficiency of the two-stage desulfurization tower is low. The main reason is that a new rotary kiln production system is considered in the original design, and the design air volume is considered as three sets of rotary kiln production and operation systems, and the actual operation air volume is low.

In order to ensure the qualified emission of SO2 in the tail gas, the way of opening two circulating pumps of the first stage kinetic energy wave desulfurization tower is adopted, which can effectively improve the desulfurization efficiency of the desulfurization tower and reduce the emission concentration of SO2. The concentration of SO2 discharged from the tail gas is kept below 200mg / m3.

(2) In the production process, in order to ensure the effective standby of each spare pump, the operation mode of reversing the pump is adopted to avoid the blockage of the inlet and outlet pipes of the standby pump when it is not used for a long time. In the actual operation process, the pump and pipeline need to be flushed at the same time when the pump is reversed. Because the pipeline is made of PP material, the pipeline strength is relatively small, the pipeline is easy to burst, and the maintenance treatment is more frequent. At the same time, due to the use of "large flow, high head" delivery pump, through the setting of reflux pipeline, continuous operation and pressure regulation, resulting in power loss.

Based on the experience of treating zinc oxide slurry in the original pulping process, 316L stainless steel is used as the material of slurry pipeline in the zinc oxide desulfurization system of rotary kiln, so as to increase the strength of the pipeline and prevent the pipeline from bursting; the conveying pumps are changed into hose pumps with frequency conversion adjustment, automatic flow regulation and continuous operation. Through the improvement of various transportation pipelines and equipment, the pipeline maintenance capacity and power consumption decreased significantly, and the pipeline did not appear obvious blockage phenomenon, and the slurry transportation system operated smoothly.

(3) In the original desulfurization slurry discharge part, it is mainly adjusted by controlling the pH value in the tower. The operation is to discharge appropriate slurry when the pH is reduced, and add fresh slurry to improve the pH value of circulating liquid in the tower and maintain the system stability. It is found that there is a waste of zinc oxide in the slurry filter during the filtration process. In order to improve this situation, a pipeline is added on the discharge pipeline of the secondary desulfurization tower to directly discharge into the primary desulfurization tower. The zinc oxide slurry is mainly supplied to the secondary desulfurization tower, and the zinc sulfite slurry is discharged from the primary desulfurization tower. Through the improvement, the circulating slurry in the two-stage desulfurization tower can also be effectively controlled.

(4) In the process of acid analysis, the multi-level horizontal analytical kettle was innovated and applied in the understanding of the leaching autoclave. In the production and operation process, it was found that the graphite flakes of the partition wall of the multi-stage horizontal analytical kettle fell off. Through the analysis, the main reason is that the thickness of graphite sheet of partition wall is thin, only 10 mm, the strength is not enough and the heat transfer is fast, leading to the partition wall compression deformation, and finally the whole anti-corrosion coating of partition wall falls off.

In order to solve the problem of deformation of autoclave partition wall under compression, the exhaust holes are set around the partition wall, and the standard graphite brick is rebuilt at the partition wall, and a column is added in the middle of the partition wall for reinforcement, so as to increase the strength of the whole anti-corrosion coating. In the later operation of the reprocessed analytical kettle, the anti-corrosion lining does not fall off again, and the problem is better.

summary Problems existing in production and operation of desulfurization system and improvement It creates conditions for the better operation of the rotary kiln. I believe that in the following work, the rotary kiln transportation will be more efficient.

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