Pressurization sealing system suitable for rotary air preheater

Abstract

The invention relates to a pressurization sealing system suitable for a rotary air preheater. The rotary air preheater comprises a rotor and a sealing plate arranged on the outer side of the rotor. The pressurization sealing system comprises a pipeline and a pressurization part arranged on the pipeline, a groove is formed in the face, right facing the rotor, of the sealing plate, one end of the pipeline communicates with an inlet flue of the rotary air preheater, and the other end of the pipeline communicates with the groove. According to the pressurization sealing system, the groove is formed in the sealing plate, pressurized smoke is introduced, an air curtain is formed between the sealing plate and the rotor, serious mechanical contact friction cannot be generated, the driving current of the air preheater cannot be increased, the system runs stably, the sealing performance is improved, meanwhile, the conditions of abrasion and falling off of a sealing device are reduced, in the whole operation period, it can be guaranteed that the air leakage rate of the air preheater is kept in a relatively stable state, system reliability is high, and unit overhaul and maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field of air preheaters, in particular to a pressure sealing system suitable for rotary air preheaters. Background technique [0002] At present, the rotary air preheater sealing device is mainly divided into two categories, one is mechanical contact sealing device, which is mainly divided into multiple sealing technology, adjustable sealing technology, flexible sealing technology, gap self-compensation technology and four compartment structure technology etc.; the other type is the withdrawable dredging and sealing system device. [0003] At present, the mechanical contact sealing technology is commonly used. After the sealing system is installed, there may be serious friction between the sealing sheet and the fan-shaped plate, and the sealing sheet is prone to wear and tear, which will cause the drive current of the air preheater to increase. The stability and reliability are not good, which increases the maint...

AI Technical Summary

Problems solved by technology

The dredging and sealing technology generally sends the leakage air in the sealing area into the secondary air, which will increase the leakage rate of the primary air, resulting in a significant decrease in the effective utilization rate of the primary fan, a further decrease in the margin of the primary fan, and a significant decrease in the adjustment margin. In severe cases, it may As a result, the output of the pulverizing system is insufficient, which affects the load capacity of the unit, and the air leakage from the high pressure head is sent to the secondary air, which will reduce its energy grade

Therefore, the dredging sealing technology does not have the effect of energy saving

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